/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #DD0000;
  --primary-dark: #b80000;
  --primary-light: #fde8e8;
  --accent: #0ea5e9;
  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;
  --bg: #f8fafc;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --text-muted: #64748b;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 16px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji';
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* ===== AUTH PAGE ===== */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1e3a8a 0%, #0ea5e9 100%);
}

.auth-container {
  background: var(--surface);
  border-radius: 16px;
  padding: 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-lg);
}

.auth-logo { text-align: center; margin-bottom: 28px; }
.auth-logo h1 { font-size: 28px; color: var(--text); font-weight: 800; }
.auth-logo h1 span { color: var(--primary); }
.auth-logo p { color: var(--text-muted); font-size: 14px; margin-top: 4px; }

.auth-tabs {
  display: flex;
  background: var(--bg);
  border-radius: var(--radius);
  padding: 4px;
  margin-bottom: 24px;
}

.tab-btn {
  flex: 1;
  padding: 10px;
  border: none;
  background: transparent;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  transition: all 0.2s;
}

.tab-btn.active {
  background: var(--surface);
  color: var(--primary);
  box-shadow: var(--shadow);
  font-weight: 600;
}

.auth-form { display: flex; flex-direction: column; gap: 16px; }
.auth-form.hidden { display: none; }

.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 13px; font-weight: 600; color: var(--text); }
.form-group input {
  padding: 11px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s;
}
.form-group input:focus { border-color: var(--primary); }

.btn-primary {
  padding: 12px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  margin-top: 4px;
}
.btn-primary:hover { background: var(--primary-dark); }
.btn-primary:active { transform: scale(0.98); }

.error-msg { color: var(--danger); font-size: 13px; text-align: center; min-height: 18px; }

/* ===== DASHBOARD ===== */
.dashboard-layout {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 240px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 24px 0;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
  z-index: 100;
}

.sidebar-logo {
  padding: 0 20px 24px;
  border-bottom: 1px solid var(--border);
}
.sidebar-logo h2 { font-size: 18px; font-weight: 800; color: var(--text); }
.sidebar-logo h2 span { color: var(--primary); }
.sidebar-logo small { color: var(--text-muted); font-size: 12px; }

.sidebar-nav { flex: 1; padding: 16px 12px; display: flex; flex-direction: column; gap: 4px; overflow-y: auto; }

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
  background: transparent;
  width: 100%;
  text-align: left;
}
.nav-item:hover { background: var(--bg); color: var(--text); }
.nav-item.active { background: var(--primary-light); color: var(--primary); font-weight: 600; }
.nav-item .icon { font-size: 18px; width: 22px; text-align: center; }

/* Sub-menu (Reading/Listening) */
.nav-group { position: relative; }
.nav-parent { cursor: pointer; display: flex; align-items: center; }
.nav-arrow { margin-left: auto; font-size: 11px; color: var(--text-muted); transition: transform 0.2s; }
.nav-group.open .nav-arrow { transform: rotate(180deg); }
.nav-sub { display: none; padding-left: 20px; }
.nav-group.open .nav-sub { display: block; }
.nav-sub-item {
  display: block; padding: 8px 12px 8px 28px; font-size: 13px; color: var(--text-muted);
  text-decoration: none; border-radius: 8px; transition: all 0.15s;
}
.nav-sub-item:hover { background: var(--bg); color: var(--text); }
.nav-sub-item.active { background: var(--primary-light); color: var(--primary); font-weight: 600; }

/* Sidebar section heading */
.nav-section-title {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 10px 12px 4px;
  margin-top: 4px;
  opacity: 0.7;
}

.sidebar-footer {
  padding: 16px 12px 0;
  border-top: 1px solid var(--border);
}
.user-info {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius);
  background: var(--bg);
  margin-bottom: 8px;
}
.avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 15px;
}
.user-name { font-size: 13px; font-weight: 600; }
.user-role { font-size: 11px; color: var(--text-muted); }

.btn-logout {
  width: 100%;
  padding: 9px;
  background: transparent;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-logout:hover { border-color: var(--danger); color: var(--danger); }

/* Main Content */
.main-content {
  margin-left: 240px;
  flex: 1;
  padding: 32px;
}

.page-header { margin-bottom: 28px; }
.page-header h1 { font-size: 24px; font-weight: 700; }
.page-header p { color: var(--text-muted); font-size: 14px; margin-top: 4px; }

/* Dashboard hero */
.dashboard-hero {
  text-align: center;
  padding: 20px 20px 14px;
}
.dashboard-hero h1 {
  font-size: 24px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 4px;
}
.hero-subtitle {
  font-size: 14px;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 10px;
}
.hero-quote {
  max-width: 520px;
  margin: 0 auto;
  font-size: 13px;
  font-style: italic;
  color: var(--text-muted);
  line-height: 1.5;
  border-left: 3px solid var(--primary);
  padding: 8px 14px;
  text-align: left;
  background: var(--surface);
  border-radius: 0 10px 10px 0;
}
.quote-vi {
  margin-top: 4px;
  font-size: 12px;
  font-style: normal;
  color: var(--text);
  opacity: 0.7;
  line-height: 1.5;
}
.hero-quote cite {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  font-style: normal;
  font-weight: 600;
  color: var(--primary);
  text-align: right;
}

/* Dashboard sections */
.dashboard-section {
  margin-bottom: 14px;
}
.dashboard-section-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}
.dashboard-section-title::before,
.dashboard-section-title::after {
  content: '';
  flex: 0 0 50px;
  height: 1px;
  background: var(--border);
}

/* Dashboard action cards */
.dashboard-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  padding: 0 20px;
  flex-wrap: wrap;
}
.dash-action-card {
  width: 128px;
  min-height: 92px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 8px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 14px;
  text-decoration: none;
  transition: all 0.2s;
  box-shadow: var(--shadow);
  text-align: center;
}
.dash-action-card:hover {
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}
.dash-action-icon { font-size: 26px; line-height: 1; }
.dash-action-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.25;
}

/* Cards */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 20px;
  box-shadow: var(--shadow);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}
.stat-card .stat-icon { font-size: 28px; margin-bottom: 8px; }
.stat-card .stat-value { font-size: 28px; font-weight: 800; color: var(--primary); }
.stat-card .stat-label { font-size: 13px; color: var(--text-muted); margin-top: 2px; }

/* Reading list */
.reading-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.reading-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  color: inherit;
  display: block;
}
.reading-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); border-color: var(--primary); }

.reading-card .badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  margin-bottom: 10px;
}
.badge-new { background: #dcfce7; color: #16a34a; }
.badge-read { background: #e0e7ff; color: #4f46e5; }
.badge-done { background: #dbeafe; color: #1d4ed8; }
.badge-inprogress { background: #fef9c3; color: #a16207; }

.reading-card h3 { font-size: 15px; font-weight: 600; margin-bottom: 6px; }
.reading-card p { font-size: 13px; color: var(--text-muted); line-height: 1.5; }
.reading-card .card-meta {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
}

/* ===== READING PAGE ===== */
.reading-page { height: 100vh; display: flex; flex-direction: column; overflow: hidden; }

.reading-topbar {
  display: flex;
  align-items: center;
  padding: 0 20px;
  height: 56px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  gap: 16px;
  flex-shrink: 0;
}

.back-btn {
  display: flex; align-items: center; gap: 4px;
  color: white; text-decoration: none;
  font-size: 13px; font-weight: 600;
  padding: 6px 12px; border-radius: 8px;
  background: var(--primary);
  white-space: nowrap;
  transition: all 0.2s;
}
.back-btn:hover { background: var(--primary-dark); color: white; }

.reading-topbar h2 {
  flex: 1;
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Language toggle */
.lang-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.lang-group {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: var(--bg);
  border-radius: 20px;
  border: 1px solid var(--border);
}
.lang-group label { font-size: 12px; color: var(--text-muted); font-weight: 500; }

.toggle-switch {
  position: relative;
  width: 44px;
  height: 22px;
  display: inline-block;
}
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background: #cbd5e1;
  border-radius: 22px;
  transition: 0.2s;
}
.toggle-slider::before {
  content: '';
  position: absolute;
  width: 16px; height: 16px;
  left: 3px; bottom: 3px;
  background: white;
  border-radius: 50%;
  transition: 0.2s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}
.toggle-switch input:checked + .toggle-slider { background: var(--primary); }
.toggle-switch input:checked + .toggle-slider::before { transform: translateX(22px); }

.toggle-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--primary);
  min-width: 20px;
}

/* Split screen */
.reading-body {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.reading-pane {
  flex: 1;
  overflow-y: auto;
  padding: 24px 28px;
}

.reading-pane:first-child {
  border-right: 2px solid var(--border);
}

.pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.pane-header h3 { font-size: 14px; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; }

.passage-content {
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
}
.passage-content p { margin-bottom: 14px; }

/* Highlight colors */
.hl-green  { background: #bbf7d0; border-radius: 2px; padding: 0 1px; }
.hl-blue   { background: #bae6fd; border-radius: 2px; padding: 0 1px; }
.hl-yellow { background: #fef08a; border-radius: 2px; padding: 0 1px; }
.hl-red    { background: #fecaca; border-radius: 2px; padding: 0 1px; }
.hl-pink   { background: #fbcfe8; border-radius: 2px; padding: 0 1px; }
/* Find reminder popup */
#find-reminder {
  position: fixed;
  top: 70px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9998;
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--text);
  color: white;
  padding: 10px 16px;
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
  font-size: 14px;
  animation: slideDown 0.3s ease;
}
@keyframes slideDown {
  from { opacity: 0; transform: translateX(-50%) translateY(-20px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}
.reminder-label {
  font-size: 12px;
  color: rgba(255,255,255,0.6);
  white-space: nowrap;
}
.reminder-word {
  font-weight: 500;
  color: rgba(255,255,255,0.9);
  font-size: 14px;
  max-width: 500px;
  line-height: 1.5;
}
.reminder-close {
  background: rgba(255,255,255,0.15);
  border: none;
  color: white;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.reminder-close:hover { background: rgba(255,255,255,0.3); }

/* Sentence markers [ ] – xoay vòng 4 màu */
.sent-marked {
  border-radius: 3px;
  padding: 2px 0;
}
.sent-marked::before {
  font-weight: 700;
  font-size: 0.9em;
}
.sent-marked::after {
  font-weight: 700;
  font-size: 0.9em;
}

.sent-color-0 { background: rgba(59,130,246,0.10); }
.sent-color-0::before { content: '[ '; color: #3b82f6; }
.sent-color-0::after  { content: ' ]'; color: #3b82f6; }

.sent-color-1 { background: rgba(234,179,8,0.12); }
.sent-color-1::before { content: '[ '; color: #ca8a04; }
.sent-color-1::after  { content: ' ]'; color: #ca8a04; }

.sent-color-2 { background: rgba(16,185,129,0.10); }
.sent-color-2::before { content: '[ '; color: #059669; }
.sent-color-2::after  { content: ' ]'; color: #059669; }

.sent-color-3 { background: rgba(168,85,247,0.10); }
.sent-color-3::before { content: '[ '; color: #9333ea; }
.sent-color-3::after  { content: ' ]'; color: #9333ea; }

.hl-strikethrough { text-decoration: line-through; text-decoration-thickness: 2px; }
.hl-underline-red { text-decoration: underline; text-decoration-color: #ef4444; text-decoration-thickness: 2px; text-underline-offset: 3px; }
.hl-strikethrough.hl-underline-red { text-decoration: line-through underline; text-decoration-color: #ef4444; text-decoration-thickness: 2px; }

/* Highlight popup */
#highlight-popup {
  position: fixed;
  z-index: 1000;
  background: var(--text);
  border-radius: 10px;
  padding: 8px;
  display: none;
  flex-direction: column;
  gap: 4px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.25);
  min-width: 200px;
  max-height: 70vh;
  overflow-y: auto;
}

.popup-colors {
  display: flex;
  gap: 6px;
  padding: 4px 6px;
  align-items: center;
}
.color-btn {
  width: 22px; height: 22px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.3);
  cursor: pointer;
  transition: transform 0.1s;
}
.color-btn:hover { transform: scale(1.2); border-color: white; }
.color-btn.c-green  { background: #22c55e; }
.color-btn.c-blue   { background: #38bdf8; }
.color-btn.c-yellow { background: #facc15; }
.color-btn.c-red    { background: #f87171; }
.color-btn.c-pink   { background: #f472b6; }

.popup-divider { height: 1px; background: rgba(255,255,255,0.15); margin: 2px 0; }

.popup-action {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border-radius: 7px;
  color: white;
  font-size: 13px;
  cursor: pointer;
  transition: background 0.15s;
}
.popup-action:hover { background: rgba(255,255,255,0.12); }
.popup-action .icon { font-size: 15px; }

/* Synonym input */
.synonym-input-row {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
}
.synonym-input-row input {
  flex: 1;
  padding: 6px 10px;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: 6px;
  color: white;
  font-size: 13px;
  outline: none;
}
.synonym-input-row input::placeholder { color: rgba(255,255,255,0.45); }
.synonym-input-row input:focus { border-color: var(--accent); }
.synonym-save-btn {
  padding: 6px 12px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
  font-weight: 600;
}

/* Question groups */
.question-group {
  margin-bottom: 24px;
  border: 1.5px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--surface);
}
.group-header {
  background: linear-gradient(135deg, #fff0f0 0%, #ffe8e8 100%);
  border-bottom: 1.5px solid var(--border);
  padding: 14px 18px;
}
.group-range {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--primary);
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}
.group-instruction {
  font-size: 14px;
  color: var(--text);
  line-height: 1.7;
  margin-bottom: 8px;
}
.group-options {
  margin-top: 10px;
  padding: 10px 14px;
  background: rgba(255,255,255,0.7);
  border-radius: 8px;
  border: 1px solid rgba(221,0,0,0.15);
}
.group-option-item {
  font-size: 13px;
  color: var(--text);
  padding: 3px 0;
  line-height: 1.5;
}
.group-questions {
  padding: 14px 18px;
}

/* Questions pane */
.question-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin-bottom: 14px;
}
.question-item:last-child { margin-bottom: 0; }
.question-item .q-number {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}
.question-item .q-text {
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 10px;
  line-height: 1.6;
}
.answer-box {
  background: #f0fdf4;
  border: 1.5px solid #86efac;
  border-radius: 8px;
  padding: 10px 14px;
  margin-bottom: 8px;
}
.answer-box .answer-label {
  font-size: 11px;
  font-weight: 700;
  color: #16a34a;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.answer-box .answer-text {
  font-size: 14px;
  font-weight: 600;
  color: #15803d;
  margin-top: 2px;
}

.why-section { margin-top: 8px; }
.why-toggle {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 13px;
  color: var(--primary);
  cursor: pointer;
  font-weight: 500;
  padding: 4px 0;
  background: none;
  border: none;
}
.why-toggle:hover { text-decoration: underline; }
.why-content {
  margin-top: 8px;
  padding: 10px 14px;
  background: var(--primary-light);
  border-radius: 8px;
  font-size: 13px;
  color: #1e40af;
  line-height: 1.6;
  display: none;
}
.why-content.open { display: block; }

/* Synonym inline tag (hiện ngay cạnh từ được bôi trong bài) */
.synonym-inline {
  display: inline-block;
  margin-left: 4px;
  padding: 1px 7px;
  background: #ede9fe;
  color: #6d28d9;
  border-radius: 10px;
  font-size: 12px;
  font-weight: 600;
  vertical-align: middle;
  line-height: 1.6;
  white-space: nowrap;
}

/* Hộp giải thích "Tại sao lại như vậy?" – luôn hiển thị */
.why-box {
  margin-top: 10px;
  padding: 10px 14px;
  background: var(--primary-light);
  border-radius: 8px;
  font-size: 13px;
  color: #1e40af;
  line-height: 1.6;
  display: flex;
  gap: 7px;
  align-items: flex-start;
}
.why-box .why-icon { flex-shrink: 0; font-size: 15px; margin-top: 1px; }

/* Nút "nằm ở đoạn nào?" */
.find-para-btn {
  margin-top: 10px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: transparent;
  border: 1.5px solid var(--primary);
  color: var(--primary);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}
.find-para-btn:hover {
  background: var(--primary-light);
}

/* Flash animation cho đoạn văn */
@keyframes para-flash {
  0%   { background-color: transparent; }
  15%  { background-color: #fef08a; }
  50%  { background-color: #fde047; }
  85%  { background-color: #fef08a; }
  100% { background-color: transparent; }
}
.para-flash {
  animation: para-flash 1.4s ease;
  border-radius: 6px;
}

/* Vocabulary panel */
.vocab-panel {
  width: 300px;
  background: var(--surface);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex-shrink: 0;
}

.vocab-panel-header {
  padding: 16px 18px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.vocab-panel-header h3 { font-size: 14px; font-weight: 700; }

.vocab-tabs {
  display: flex;
  border-bottom: 1.5px solid var(--border);
  padding: 0 12px;
}
.vocab-tab {
  flex: 1;
  padding: 10px 8px;
  background: none;
  border: none;
  border-bottom: 2.5px solid transparent;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  text-align: center;
  transition: all 0.15s;
}
.vocab-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}
.vocab-tab:hover { color: var(--text); }
.tab-badge {
  display: inline-block;
  background: var(--border);
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 10px;
  margin-left: 4px;
}
.vocab-tab.active .tab-badge {
  background: var(--primary-light);
  color: var(--primary);
}

.vocab-panel-body { flex: 1; overflow-y: auto; padding: 12px; }

.vocab-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 10px 12px;
  border-radius: 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  margin-bottom: 8px;
  font-size: 13px;
}
.vocab-item .vocab-word { font-weight: 700; color: var(--text); }
.vocab-item .vocab-syn { color: var(--text-muted); margin-top: 2px; }
.vocab-item .vocab-syn span { color: var(--primary); font-weight: 500; }
.vocab-delete {
  margin-left: auto;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 16px;
  line-height: 1;
  padding: 0 2px;
}
.vocab-delete:hover { color: var(--danger); }

/* Vocab panel: 2/3 list + 1/3 notes */
.vocab-panel-body {
  flex: 2;
  overflow-y: auto;
  padding: 12px;
  min-height: 0; /* bắt buộc để flex shrink hoạt động */
}

/* Export bar (giữa vocab list và notes) */
.vocab-export-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  flex-shrink: 0;
}
.export-trigger-btn {
  padding: 5px 12px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 7px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}
.export-trigger-btn:hover { background: var(--primary-dark); }

/* Notes: 1/3 */
.note-area {
  flex: 1;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 0;
}
.note-area label { font-size: 12px; font-weight: 600; color: var(--text-muted); }
.note-area textarea {
  flex: 1;
  width: 100%;
  min-height: 0;
  padding: 8px 10px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 13px;
  resize: none;
  outline: none;
  font-family: inherit;
  line-height: 1.5;
}
.note-area textarea:focus { border-color: var(--primary); }
.note-save-btn {
  padding: 7px 16px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 7px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  align-self: flex-end;
}
.note-save-btn:hover { background: var(--primary-dark); }

/* Modal xuất từ vựng */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15,23,42,0.55);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal-box {
  background: var(--surface);
  border-radius: 14px;
  padding: 24px;
  width: 100%;
  max-width: 520px;
  box-shadow: var(--shadow-lg);
  max-height: 90vh;
  overflow-y: auto;
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.modal-header h3 { font-size: 17px; font-weight: 700; }
.modal-close {
  background: none; border: none;
  font-size: 22px; cursor: pointer;
  color: var(--text-muted); line-height: 1;
}
.modal-close:hover { color: var(--text); }

.export-platform-btns {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
}
.platform-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 14px 10px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  transition: all 0.15s;
}
.platform-btn:hover { border-color: var(--primary); color: var(--primary); }
.platform-btn.active { border-color: var(--primary); background: var(--primary-light); color: var(--primary); }

.export-instruction {
  font-size: 13px;
  color: var(--text-muted);
  background: var(--bg);
  border-radius: 8px;
  padding: 10px 12px;
  margin-bottom: 12px;
  line-height: 1.6;
}
.export-textarea {
  width: 100%;
  min-height: 160px;
  padding: 10px 12px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-family: 'Courier New', monospace;
  font-size: 13px;
  background: #f8fafc;
  resize: vertical;
  outline: none;
  cursor: text;
}

/* Scrollbar styling */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #94a3b8; }

/* Utility */
.hidden { display: none !important; }
.flex { display: flex; }
.gap-2 { gap: 8px; }

/* Export/Import buttons */
.topbar-btn-outline {
  padding: 8px 14px !important;
  font-size: 13px !important;
  background: transparent !important;
  border: 1.5px solid rgba(255,255,255,0.3) !important;
  color: var(--text-muted) !important;
}
.topbar-btn-outline:hover {
  background: var(--primary-light) !important;
  border-color: var(--primary) !important;
  color: var(--primary) !important;
}

/* Grading mode */
.grading-error {
  border-color: #dc2626 !important;
  background: #fef2f2 !important;
  box-shadow: 0 0 0 2px rgba(220,38,38,0.3);
}

/* Admin action buttons */
.admin-action-btn {
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: transparent;
  font-size: 12px;
  cursor: pointer;
  color: var(--text-muted);
  white-space: nowrap;
}
.admin-action-btn:hover { background: var(--bg); color: var(--text); }
.admin-delete-btn:hover { background: #fef2f2; color: var(--danger); border-color: var(--danger); }

/* ===== LISTENING PAGE ===== */

/* Audio Player */
.audio-player-section {
  padding: 18px;
  border-bottom: 1.5px solid var(--border);
  background: linear-gradient(135deg, #fff0f0 0%, #fff8f8 100%);
}
.audio-player {
  background: var(--surface);
  border-radius: 12px;
  padding: 14px 18px;
  box-shadow: var(--shadow);
}
.player-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}
.player-btn {
  width: 42px; height: 42px;
  border-radius: 50%;
  border: none;
  background: var(--primary);
  color: white;
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.15s;
}
.player-btn:hover { background: var(--primary-dark); }
.player-progress-wrap {
  flex: 1;
  height: 8px;
  background: var(--border);
  border-radius: 4px;
  cursor: pointer;
  overflow: hidden;
}
.player-progress {
  height: 100%;
  background: var(--primary);
  border-radius: 4px;
  width: 0%;
  transition: width 0.2s linear;
}
.player-time {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
  white-space: nowrap;
  min-width: 80px;
  text-align: right;
}
.player-speed {
  display: flex;
  gap: 6px;
  margin-top: 10px;
  justify-content: center;
}
.speed-btn {
  padding: 4px 10px;
  border: 1.5px solid var(--border);
  border-radius: 14px;
  background: transparent;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.15s;
}
.speed-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}
.speed-btn:hover { border-color: var(--primary); color: var(--primary); }
.speed-btn.active:hover { color: white; }

/* Fill-in-the-blank Questions */
.listening-questions {
  padding: 18px;
  font-size: 15px;
  line-height: 2;
  color: var(--text);
}
.listening-section {
  margin-bottom: 20px;
}
.listen-table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0;
  font-size: 14px;
}
.listen-table th {
  background: var(--primary);
  color: white;
  padding: 8px 12px;
  text-align: left;
  font-weight: 600;
  white-space: nowrap;
}
.listen-table td {
  padding: 8px 12px;
  border: 1px solid var(--border);
  vertical-align: top;
  line-height: 1.8;
}
.listen-table tr:nth-child(even) td {
  background: #f8fafc;
}
.section-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}
.section-content { line-height: 2.2; }
.blank-wrap {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin: 2px 4px;
  vertical-align: middle;
}
.blank-num {
  font-size: 11px;
  font-weight: 700;
  color: white;
  background: var(--primary);
  border-radius: 10px;
  padding: 1px 7px;
  min-width: 22px;
  text-align: center;
}
.blank-input {
  width: 140px;
  padding: 4px 10px;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s;
}
.blank-input:focus { border-color: var(--primary); }
.blank-input.blank-correct {
  border-color: #16a34a;
  background: #f0fdf4;
  color: #15803d;
  font-weight: 600;
}
.blank-input.blank-wrong {
  border-color: #dc2626;
  background: #fef2f2;
  color: #dc2626;
  text-decoration: line-through;
}
.answer-hint {
  font-size: 12px;
  font-weight: 600;
  color: #16a34a;
  margin-left: 4px;
  white-space: nowrap;
}

/* Subtitle Panel */
.subtitle-content {
  padding: 12px;
  max-height: calc(100vh - 160px);
  overflow-y: auto;
}
.subtitle-line {
  display: flex;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s;
  margin-bottom: 4px;
  line-height: 1.6;
}
.subtitle-line:hover { background: var(--bg); }
.subtitle-line.sub-active {
  background: var(--primary-light);
  border-left: 3px solid var(--primary);
}
.sub-time {
  font-size: 11px;
  font-weight: 600;
  color: var(--primary);
  min-width: 40px;
  padding-top: 2px;
  flex-shrink: 0;
}
.sub-text {
  font-size: 14px;
  color: var(--text);
}

/* ===== TRANSLATION PAGE ===== */
.trans-layout {
  display: flex;
  margin-top: 60px;
  min-height: calc(100vh - 60px);
}
.trans-body {
  flex: 1;
  padding: 20px;
  min-width: 0;
}
.trans-section {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 12px;
  margin-bottom: 20px;
  overflow: hidden;
}
.trans-section-header {
  background: linear-gradient(135deg, #fff0f0 0%, #fff8f8 100%);
  padding: 12px 18px;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--primary);
  border-bottom: 1.5px solid var(--border);
}

/* Câu gốc */
.trans-original {
  padding: 20px;
  font-size: 18px;
  line-height: 2;
  color: var(--text);
  user-select: text;
  cursor: text;
}
.orig-word {
  display: inline;
  border-radius: 3px;
  padding: 1px 0;
  transition: background 0.15s;
}
.orig-done {
  opacity: 0.4;
  text-decoration: line-through;
}
.chip-remaining {
  border-style: dashed !important;
  opacity: 0.5;
  border-color: var(--text-muted) !important;
  background: var(--bg) !important;
}
.remaining-hint {
  font-size: 10px;
  color: var(--text-muted);
  text-align: center;
  font-style: italic;
}
/* Translation inputs */
.trans-input {
  width: 100%;
  padding: 5px 8px;
  border: 1.5px solid var(--border);
  border-radius: 6px;
  font-size: 12px;
  font-family: inherit;
  outline: none;
  text-align: center;
}
.trans-input:focus { border-color: var(--primary); }
.hint-btn {
  padding: 3px 8px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: transparent;
  font-size: 10px;
  color: var(--text-muted);
  cursor: pointer;
  white-space: nowrap;
}
.hint-btn:hover { background: var(--primary-light); color: var(--primary); border-color: var(--primary); }

.finalize-btn, .finalize-btn:active {
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.finalize-btn {
  padding: 4px 10px;
  border: 1.5px solid var(--success);
  border-radius: 6px;
  background: #f0fdf4;
  color: var(--success);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}
.finalize-btn:hover { background: var(--success); color: white; }
.word-divider {
  display: inline-block;
  cursor: pointer;
  color: transparent;
  width: 8px;
  text-align: center;
  position: relative;
  vertical-align: middle;
  transition: all 0.15s;
  border-radius: 2px;
  margin: 0 1px;
}
.word-divider:hover {
  color: var(--primary);
  background: var(--primary-light);
  width: 14px;
  font-weight: 700;
}
.word-divider.divider-cut {
  color: var(--primary);
  background: var(--primary);
  width: 3px;
  margin: 0 3px;
  border-radius: 2px;
}

/* Cut popup */
#cut-popup {
  position: fixed;
  z-index: 1000;
  background: var(--text);
  border-radius: 10px;
  padding: 6px;
  display: none;
  flex-direction: column;
  box-shadow: 0 8px 24px rgba(0,0,0,0.25);
}
#cut-popup .popup-action {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 14px; border-radius: 7px; color: white;
  font-size: 14px; font-weight: 600; cursor: pointer;
}
#cut-popup .popup-action:hover { background: rgba(255,255,255,0.12); }

/* Câu xé – inline horizontal */
.trans-cuts-inline {
  padding: 16px 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  min-height: 60px;
  align-items: flex-start;
}
.cuts-placeholder {
  color: var(--text-muted);
  font-size: 13px;
  text-align: center;
  width: 100%;
  padding: 12px;
}

/* Mỗi cụm = 1 cột dọc (chip + dropdowns bên dưới) */
.cut-column {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  min-width: 80px;
}
.cut-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--primary-light);
  border: 1.5px solid var(--primary);
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary-dark);
  position: relative;
}
.cut-fn-badge {
  font-size: 10px;
  font-weight: 700;
  color: white;
  padding: 1px 5px;
  border-radius: 4px;
  line-height: 1;
}
.cut-remove {
  background: none;
  border: none;
  color: var(--primary);
  font-size: 14px;
  cursor: pointer;
  opacity: 0.5;
  padding: 0 1px;
}
.cut-remove:hover { opacity: 1; }

/* Dropdown inline dưới mỗi cụm */
.func-select-inline {
  width: 100%;
  padding: 4px 6px;
  border: 1.5px solid var(--border);
  border-radius: 6px;
  font-size: 11px;
  font-family: inherit;
  outline: none;
  background: white;
  color: var(--text);
  text-align: center;
}
.func-select-inline:focus { border-color: var(--primary); }
.func-select-inline.sub {
  border-color: #ddd;
  font-size: 10px;
  color: var(--text-muted);
}
.verb-checkbox-inline {
  display: flex;
  align-items: center;
  gap: 3px;
  font-size: 10px;
  color: var(--text-muted);
  cursor: pointer;
  justify-content: center;
}
.verb-checkbox-inline input { cursor: pointer; width: 12px; height: 12px; }
.func-locked {
  font-size: 10px;
  color: var(--text-muted);
  text-align: center;
  padding: 3px 6px;
  background: var(--bg);
  border-radius: 4px;
  font-weight: 600;
}

/* Notification bar (hover, không chắn) */
.notify-bar {
  position: fixed;
  top: 68px;
  right: 20px;
  left: auto;
  transform: none;
  z-index: 9998;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--text);
  color: white;
  padding: 16px 22px;
  border-radius: 14px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
  font-size: 14px;
  max-width: 360px;
  min-width: 280px;
  animation: slideDown 0.3s ease;
}
.notify-bar span { line-height: 1.6; }
.notify-bar #notify-actions { align-self: flex-end; }
.notify-close {
  background: rgba(255,255,255,0.15);
  border: none; color: white;
  width: 24px; height: 24px; border-radius: 50%;
  cursor: pointer; font-size: 13px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.notify-close:hover { background: rgba(255,255,255,0.3); }
#notify-actions { display: flex; gap: 6px; flex-shrink: 0; }
#notify-actions button {
  padding: 5px 14px;
  border-radius: 8px;
  border: 1.5px solid rgba(255,255,255,0.3);
  background: transparent;
  color: white;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}
#notify-actions button:hover { background: rgba(255,255,255,0.15); }
#notify-actions button.notify-primary {
  background: var(--primary);
  border-color: var(--primary);
}

/* Theory panel */
.theory-panel {
  width: 320px;
  flex-shrink: 0;
  background: var(--surface);
  border-left: 1.5px solid var(--border);
  overflow-y: auto;
  max-height: calc(100vh - 60px);
}
.theory-header {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  background: var(--surface);
  z-index: 1;
}
.theory-header h3 { font-size: 14px; font-weight: 700; }
.theory-content { padding: 16px; }
.theory-step {
  margin-bottom: 18px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
.theory-step:last-child { border-bottom: none; }
.theory-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}
.theory-step p { font-size: 13px; line-height: 1.7; color: var(--text); margin-bottom: 8px; }
.theory-box {
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 12px;
  line-height: 1.6;
  margin-bottom: 6px;
}
.theory-hot { background: #dbeafe; border-left: 3px solid #2563eb; }
.theory-viec { background: #fef3c7; border-left: 3px solid #d97706; }
.theory-dtch { background: #dcfce7; border-left: 3px solid #16a34a; }
.theory-hint { color: var(--text-muted); font-size: 11px; }
.theory-step.theory-flash {
  animation: theoryFlash 2s ease;
  border-radius: 8px;
}
@keyframes theoryFlash {
  0% { background: transparent; }
  10% { background: #fef08a; }
  100% { background: transparent; }
}
.theory-example {
  background: var(--bg);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 13px;
  line-height: 1.8;
}
.ex-dtch { color: #16a34a; margin-bottom: 4px; }
.ex-mdqh { color: #2563eb; }

/* ===== SPEAKING ===== */
.speaking-group { border: 1.5px solid var(--border); border-radius: 12px; margin-bottom: 12px; overflow: hidden; }
.speaking-group-header {
  display: flex; align-items: center; gap: 8px; padding: 14px 18px;
  cursor: pointer; border-left: 4px solid var(--primary); background: var(--bg);
  font-size: 15px; font-weight: 600; transition: background 0.15s;
}
.speaking-group-header:hover { background: var(--primary-light); }
.speaking-group-count { margin-left: auto; font-size: 12px; color: var(--text-muted); font-weight: 400; }
.speaking-group-arrow { font-size: 10px; color: var(--text-muted); transition: transform 0.2s; }
.speaking-group.open .speaking-group-arrow { transform: rotate(180deg); }
.speaking-group-body { display: none; padding: 12px 18px; }
.speaking-group.open .speaking-group-body { display: block; }
.speaking-topics-grid { display: flex; flex-wrap: wrap; gap: 8px; }
.speaking-topic-card {
  padding: 10px 16px; border: 1.5px solid var(--border); border-radius: 8px;
  text-decoration: none; color: var(--text); font-size: 14px; font-weight: 500;
  transition: all 0.15s; display: flex; align-items: center; gap: 8px;
}
.speaking-topic-card:hover { border-color: var(--primary); background: var(--primary-light); }
.topic-qcount { font-size: 11px; color: var(--text-muted); }
.topic-done { border-color: #16a34a; background: #f0fdf4; }
.topic-done-badge {
  font-size: 10px; font-weight: 700; color: white; background: #16a34a;
  padding: 1px 6px; border-radius: 4px; text-transform: uppercase;
}
.speak-reset-btn {
  margin-left: auto; padding: 4px 10px; border: 1px solid var(--border);
  border-radius: 6px; background: transparent; font-size: 12px;
  cursor: pointer; color: var(--text-muted); white-space: nowrap;
}
.speak-reset-btn:hover { background: #fef2f2; color: var(--danger); border-color: var(--danger); }

/* Speaking practice page */
.speaking-body { padding: 20px; margin-top: 60px; max-width: 100%; }
.en-hidden { filter: blur(6px); user-select: none; pointer-events: none; transition: filter 0.3s; }
.en-hidden:hover { filter: blur(3px); }
.speaking-section {
  background: var(--surface); border: 1.5px solid var(--border); border-radius: 12px;
  margin-bottom: 24px; overflow: hidden;
}
.speaking-q-header {
  background: linear-gradient(135deg, #fff0f0, #fff8f8);
  padding: 14px 18px; border-bottom: 1.5px solid var(--border);
  display: flex; align-items: center; gap: 10px;
}
.speaking-q-num { font-size: 12px; font-weight: 700; color: var(--primary); text-transform: uppercase; }
.speaking-q-text { font-size: 15px; font-weight: 600; color: var(--text); }
.speaking-idea-area { padding: 16px 18px; }
.speaking-idea {
  width: 100%; padding: 10px; border: 1.5px solid var(--border); border-radius: 8px;
  font-size: 14px; font-family: inherit; resize: vertical; min-height: 60px; margin-top: 8px; outline: none;
}
.speaking-idea:focus { border-color: var(--primary); }
.speaking-label { font-size: 12px; font-weight: 700; color: var(--text-muted); text-transform: uppercase; margin-bottom: 10px; }
.speaking-answer-vi, .speaking-answer-en { padding: 16px 18px; border-top: 1px solid var(--border); }
.speaking-vi-chunks { display: flex; flex-wrap: wrap; gap: 10px; }
.vi-chunk {
  flex: 1; min-width: 150px; border: 1.5px solid var(--border); border-radius: 10px;
  padding: 10px 12px; background: var(--bg);
}
.vi-text { font-size: 14px; color: var(--text); font-weight: 500; margin-bottom: 6px; }
.en-slot { min-height: 28px; }
.en-filled { font-size: 13px; color: var(--primary); font-weight: 600; display: block; margin-bottom: 4px; }
.en-empty { font-size: 12px; color: var(--text-muted); font-style: italic; }
.speak-btn, .mic-btn {
  padding: 3px 8px; border: 1px solid var(--border); border-radius: 5px;
  background: transparent; font-size: 11px; cursor: pointer; margin-right: 4px; margin-top: 4px;
}
.speak-btn:hover { background: var(--primary-light); color: var(--primary); }
.mic-btn:hover { background: #fef3c7; color: #d97706; }
.mic-result { font-size: 12px; margin-top: 4px; min-height: 18px; }
.chunk-note-input {
  margin-top: 6px; width: 100%; padding: 4px 8px; border: 1px dashed var(--border);
  border-radius: 6px; font-size: 11px; color: var(--text-muted); background: #fafafa;
  outline: none; transition: border-color 0.2s, background 0.2s, color 0.2s;
}
.chunk-note-input:focus { border-color: var(--primary); color: var(--text); background: white; }
/* Non-empty note → yellow highlight so it stands out from blank ones */
.chunk-note-input:not(:placeholder-shown):not(:focus) {
  background: #fef08a;
  border-color: #eab308;
  border-style: solid;
  color: #713f12;
  font-weight: 600;
}
.speak-btn-full {
  padding: 8px 16px; border: 1.5px solid var(--primary); border-radius: 8px;
  background: transparent; color: var(--primary); font-size: 13px; font-weight: 600;
  cursor: pointer; margin-top: 10px;
}
.speak-btn-full:hover { background: var(--primary-light); }
.speaking-active {
  background: #fef2f2 !important; border-color: #dc2626 !important; color: #dc2626 !important;
}

/* ===== SPEECH POPUP ===== */
#speech-popup { position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: 9999; display: flex; align-items: center; justify-content: center; }
.speech-popup-backdrop { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); }
.speech-popup-box {
  position: relative; background: white; border-radius: 16px; padding: 24px;
  width: 90%; max-width: 440px; box-shadow: 0 20px 60px rgba(0,0,0,0.3);
  animation: speechPopupIn 0.2s ease-out;
}
@keyframes speechPopupIn { from { opacity: 0; transform: scale(0.9) translateY(20px); } to { opacity: 1; transform: scale(1) translateY(0); } }
.speech-popup-header {
  display: flex; align-items: center; gap: 10px; margin-bottom: 16px;
  font-size: 16px; font-weight: 700; color: #dc2626;
}
.speech-popup-dot {
  width: 12px; height: 12px; border-radius: 50%; background: #dc2626;
  animation: speechDotPulse 1s infinite;
}
@keyframes speechDotPulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.5; transform: scale(1.3); } }
.speech-popup-expected {
  background: #f8fafc; border: 1px solid var(--border); border-radius: 10px;
  padding: 12px 14px; margin-bottom: 16px;
}
.speech-popup-transcript {
  background: #fffbeb; border: 1.5px solid #fbbf24; border-radius: 10px;
  padding: 16px; min-height: 60px; margin-bottom: 16px;
  display: flex; align-items: center; justify-content: center; text-align: center;
}
.speech-popup-stop {
  width: 100%; padding: 14px; font-size: 15px; border-radius: 10px;
  background: var(--primary) !important; color: white !important;
}
.speech-popup-stop:hover { opacity: 0.9; }

/* Progressive chunks */
.vi-chunk-next { border: 2px dashed var(--primary) !important; background: #fff5f5 !important; }
.vi-chunk-hidden { display: none !important; }
.en-chunk-done {
  display: inline-block; padding: 4px 10px; background: #f0fdf4; border: 1px solid #86efac;
  border-radius: 6px; font-size: 13px; font-weight: 500; color: #166534;
}

.speaking-en-sentence {
  font-size: 16px; line-height: 2; padding: 8px 0;
}

/* ===== HAMBURGER MENU ===== */
.hamburger {
  display: none;
  position: fixed;
  bottom: 16px; right: 16px;
  z-index: 201;
  width: 48px; height: 48px;
  border-radius: 50%;
  border: none;
  background: var(--primary);
  color: white;
  font-size: 22px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}
.sidebar-open .sidebar { transform: translateX(0) !important; }
.sidebar-overlay {
  display: none;
  position: fixed; inset: 0;
  z-index: 99;
  background: rgba(0,0,0,0.4);
}
.sidebar-open .sidebar-overlay { display: block; }

/* ===== RESPONSIVE ===== */
/* ===== CAMBRIDGE ACCORDION VIEW ===== */
.cam-book {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  margin-bottom: 16px;
}

.cam-book-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  cursor: pointer;
  user-select: none;
  transition: background 0.15s;
}
.cam-book-header:hover { background: var(--bg); }

.cam-arrow {
  font-size: 18px;
  color: var(--text-muted);
  transition: transform 0.25s;
}
.cam-book.open .cam-arrow { transform: rotate(180deg); }

.cam-book-body {
  display: none;
  padding: 0 24px 20px;
}
.cam-book.open .cam-book-body { display: block; }

.cam-test {
  margin-bottom: 16px;
}
.cam-test:last-child { margin-bottom: 0; }

.cam-test-label {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}

.cam-passages {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.cam-passage-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--bg);
  border-radius: 8px;
  text-decoration: none;
  color: var(--text);
  transition: all 0.15s;
  border: 1px solid transparent;
}
.cam-passage-card:hover {
  background: var(--primary-light);
  border-color: var(--primary);
  transform: translateX(4px);
}

.cam-passage-num {
  font-size: 12px;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-light);
  padding: 4px 10px;
  border-radius: 6px;
  white-space: nowrap;
  min-width: 80px;
  text-align: center;
}

.cam-passage-title {
  font-size: 14px;
  font-weight: 600;
  flex: 1;
}

.cam-passage-vi {
  font-size: 13px;
  color: var(--text-muted);
  flex: 1;
}

.cam-badge-done {
  font-size: 11px;
  font-weight: 600;
  color: var(--success);
  background: #dcfce7;
  padding: 3px 10px;
  border-radius: 20px;
  white-space: nowrap;
}

.cam-badge-new {
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  background: #e0f2fe;
  padding: 3px 10px;
  border-radius: 20px;
  white-space: nowrap;
}

.cam-passage-card.cam-done {
  opacity: 0.7;
}
.cam-passage-card.cam-done:hover { opacity: 1; }

@media (max-width: 768px) {
  /* Hamburger visible */
  .hamburger { display: flex; }

  /* Sidebar: slide-in overlay */
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 200;
  }

  /* Main content: no margin */
  .main-content { margin-left: 0; padding: 16px; padding-top: 60px; }

  /* Dashboard */
  .page-header { padding-right: 0; }
  .page-header h1 { font-size: 20px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .dashboard-actions { flex-wrap: wrap; }
  .dashboard-hero h1 { font-size: 24px; }
  .hero-quote { max-width: 100%; font-size: 14px; }

  /* Reading/Listening body: stack */
  .reading-body { flex-direction: column; }
  .reading-pane { min-height: auto; }
  .vocab-panel { width: 100%; border-left: none; border-top: 1px solid var(--border); position: fixed; bottom: 0; left: 0; right: 0; max-height: 50vh; z-index: 150; }

  /* Topbar */
  .reading-topbar {
    flex-wrap: nowrap;
    padding: 8px 12px;
    gap: 6px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .reading-topbar h2 { font-size: 14px; min-width: 0; }
  .lang-controls { flex-wrap: nowrap; gap: 4px; overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .lang-controls button, .lang-controls label {
    padding: 5px 8px !important;
    font-size: 11px !important;
  }
  .lang-group label, .lang-group span { font-size: 11px; }
  .toggle-switch { transform: scale(0.8); }
  .back-btn { font-size: 12px; }
  .topbar-btn-outline { padding: 5px 8px !important; font-size: 11px !important; }

  /* Passage/Questions */
  .passage-content { font-size: 14px; line-height: 1.7; }
  .question-group { font-size: 13px; }
  .group-header { padding: 10px 12px; }
  .group-questions { padding: 10px 12px; }
  .question-item { padding: 12px; }

  /* Highlight popup */
  #highlight-popup { min-width: 180px; }

  /* Listening */
  .audio-player-section { padding: 12px; }
  .player-time { font-size: 11px; min-width: 60px; }
  .listening-questions { padding: 12px; font-size: 14px; }
  .blank-input { width: 90px; font-size: 12px; }
  .blank-num { font-size: 10px; padding: 1px 5px; }

  /* Translation */
  .trans-layout { flex-direction: column; }
  .trans-body { padding: 12px; }
  .theory-panel { width: 100%; border-left: none; border-top: 1px solid var(--border); max-height: 40vh; position: relative; }
  .trans-original { font-size: 16px; padding: 14px; }
  .trans-cuts-inline { gap: 6px; }
  .cut-column { min-width: 60px; }
  .cut-chip { font-size: 12px; padding: 5px 8px; }
  .func-select-inline { font-size: 10px; padding: 3px 4px; }

  /* Speaking */
  .speaking-body { padding: 12px; margin-top: 80px; }
  .speaking-section { margin-bottom: 16px; }
  .speaking-q-header { flex-wrap: wrap; gap: 6px; padding: 10px 12px; }
  .speaking-q-text { font-size: 14px; }
  .speaking-vi-chunks { flex-direction: column; }
  .vi-chunk { min-width: auto; }
  .speaking-en-sentence { font-size: 14px; }
  .speaking-idea { min-height: 50px; }
  .speak-reset-btn { font-size: 11px; padding: 3px 8px; }
  .word-divider { width: 16px; min-height: 24px; }
  .word-divider:hover { width: 20px; }
  .finalize-btn { padding: 8px 16px; font-size: 13px; }

  /* Speaking list */
  .speaking-topic-card { padding: 8px 12px; font-size: 13px; }

  /* Cards grid */
  .reading-grid { grid-template-columns: 1fr; }
  .admin-grid { grid-template-columns: 1fr; }

  /* Auth page */
  .auth-card { width: 95%; margin: 20px auto; }

  /* Onboarding */
  #onboarding-overlay > div { padding: 20px; max-width: 95%; }

  /* Find reminder */
  #find-reminder { max-width: 90vw; font-size: 12px; }
  .reminder-word { max-width: 200px; font-size: 13px; }

  /* Notify bar */
  .notify-bar { max-width: 90vw; font-size: 12px; padding: 8px 12px; }

  /* Cambridge accordion mobile */
  .cam-book-header { padding: 14px 16px; }
  .cam-book-header span:first-child { font-size: 16px !important; }
  .cam-book-body { padding: 0 12px 16px; }
  .cam-passage-card { flex-wrap: wrap; gap: 6px; padding: 12px; }
  .cam-passage-num { min-width: auto; font-size: 11px; padding: 3px 8px; }
  .cam-passage-title { font-size: 13px; width: 100%; order: 2; }
  .cam-passage-vi { font-size: 12px; width: 100%; order: 3; }

  /* Part 2 category tabs mobile */
  .p2-category-tabs { gap: 6px; }
  .p2-cat-tab { font-size: 12px; padding: 6px 10px; }
  .p2-cat-icon { display: none; }
}

/* ============================================================
   SPEAKING PART 2 – Category Tabs & Sections
   ============================================================ */
.p2-category-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.p2-cat-tab {
  padding: 8px 16px;
  border: 2px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 6px;
}

.p2-cat-tab:hover {
  border-color: var(--primary);
  background: rgba(221, 0, 0, 0.04);
}

.p2-cat-tab.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.p2-cat-tab.active .p2-cat-count {
  background: rgba(255,255,255,0.3);
  color: white;
}

.p2-cat-count {
  background: var(--bg);
  padding: 1px 7px;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
}

.p2-cat-icon {
  font-size: 16px;
}

.p2-category-section {
  margin-bottom: 32px;
}

.p2-category-header {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* ============================================================
   SPEAKING PART 2 – Practice Page
   ============================================================ */

/* Cue Card */
.p2-cue-card {
  margin-bottom: 20px;
}
.p2-cue-card-inner {
  background: linear-gradient(135deg, #fefce8, #fef3c7);
  border: 2px solid #f59e0b;
  border-radius: 14px;
  padding: 24px;
}
.p2-cue-topic {
  font-size: 1.2em;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}
.p2-cue-topic-vi {
  font-size: 0.9em;
  color: var(--text-muted);
  margin-bottom: 14px;
}
.p2-cue-label {
  font-size: 0.85em;
  font-weight: 600;
  color: #92400e;
  margin-bottom: 8px;
}
.p2-cue-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.p2-cue-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  font-size: 0.95em;
}
.p2-cue-bullet {
  color: #d97706;
  font-weight: 700;
}
.p2-cue-tag {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 6px;
  white-space: nowrap;
  margin-left: auto;
}

/* Tip */
.p2-tip {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 13px;
  color: #1e40af;
  margin-bottom: 24px;
  line-height: 1.6;
}

/* Question Section */
.p2-question-section {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 20px;
}
.p2-q-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.p2-q-number {
  background: var(--primary);
  color: white;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
}
.p2-q-text {
  font-weight: 600;
  font-size: 1em;
  flex: 1;
}

/* Part 1 Suggestions */
.p2-suggestions {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  margin-bottom: 14px;
  overflow: hidden;
}
.p2-suggest-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  user-select: none;
}
.p2-suggest-header:hover { background: #f1f5f9; }
.p2-suggest-arrow { font-size: 11px; transition: transform 0.2s; }

.p2-suggest-body {
  padding: 0 14px 14px;
  max-height: 400px;
  overflow-y: auto;
}

/* Part 1 Group */
.p2-p1-group {
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  margin-bottom: 6px;
  overflow: hidden;
}
.p2-p1-match {
  border-color: #f59e0b;
  background: #fffbeb;
}
.p2-p1-group-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
}
.p2-p1-group-header:hover { background: rgba(0,0,0,0.03); }
.p2-p1-group-body { display: none; padding: 0 12px 8px; }
.p2-p1-group.open .p2-p1-group-body { display: block; }

/* Part 1 Topic */
.p2-p1-topic { margin-bottom: 4px; }
.p2-p1-topic-name {
  font-size: 13px;
  font-weight: 500;
  padding: 4px 0;
  cursor: pointer;
  color: var(--primary);
}
.p2-p1-topic-name:hover { text-decoration: underline; }
.p2-p1-topic-questions { display: none; padding-left: 12px; }
.p2-p1-topic.open .p2-p1-topic-questions { display: block; }

/* Part 1 Question (selectable) */
.p2-p1-q {
  display: flex;
  align-items: flex-start;
  gap: 6px;
  padding: 4px 6px;
  font-size: 12px;
  cursor: pointer;
  border-radius: 4px;
  transition: background 0.15s;
}
.p2-p1-q:hover { background: #e2e8f0; }
.p2-p1-q.selected { background: #dbeafe; color: #1d4ed8; font-weight: 500; }
.p2-p1-q-hot { background: #fffbeb; border-left: 2px solid #f59e0b; }
.p2-p1-q-text { flex: 1; }

/* Translate button */
.p2-translate-btn {
  margin-top: 6px;
  padding: 6px 14px;
  font-size: 12px;
  background: #7c3aed;
}

/* Collected Part 1 content cards */
.p2-collected { margin-bottom: 14px; }
.p2-collected-card {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: 10px;
  padding: 12px;
  margin-bottom: 8px;
}
.p2-collected-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 6px;
}
.p2-collected-body {
  font-size: 14px;
  line-height: 1.5;
  color: var(--text);
  padding: 8px;
  background: white;
  border-radius: 6px;
  margin-bottom: 8px;
}
.p2-use-btn {
  padding: 6px 14px;
  font-size: 12px;
  background: #16a34a;
}
.p2-p1-check { font-size: 14px; flex-shrink: 0; }

/* Answer area */
.p2-answer-area { }
.p2-answer-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
}
.p2-textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  resize: vertical;
  outline: none;
  transition: border-color 0.2s;
}
.p2-textarea:focus {
  border-color: var(--primary);
}
.p2-ai-btn {
  padding: 8px 14px;
  font-size: 13px;
}

/* Mobile */
@media (max-width: 768px) {
  .p2-cue-card-inner { padding: 16px; }
  .p2-cue-topic { font-size: 1em; }
  .p2-cue-list li { flex-wrap: wrap; }
  .p2-cue-tag { margin-left: 0; margin-top: 2px; }
  .p2-question-section { padding: 14px; }
  .p2-q-header { flex-wrap: wrap; }
}

/* ============================================================
   VOCAB MODULE — gradient & smooth animations cho flashcards/study
   ============================================================ */

/* ── List page ── */
.vocab-hero {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 18px;
  padding: 32px 28px;
  color: #fff;
  margin-bottom: 28px;
  position: relative;
  overflow: hidden;
}
.vocab-hero::before {
  content: ''; position: absolute; top: -40px; right: -40px;
  width: 220px; height: 220px; border-radius: 50%;
  background: rgba(255,255,255,0.08);
}
.vocab-hero h2 { font-size: 26px; font-weight: 900; margin-bottom: 6px; position: relative; z-index: 1;}
.vocab-hero p  { font-size: 15px; opacity: 0.95; line-height: 1.6; position: relative; z-index: 1;}
.vocab-hero-actions { display: flex; gap: 10px; margin-top: 18px; position: relative; z-index: 1; flex-wrap: wrap; }
.vocab-hero-btn {
  background: rgba(255,255,255,0.95); color: #4f46e5; border: none;
  padding: 11px 20px; border-radius: 12px; font-weight: 700;
  cursor: pointer; transition: all 0.2s; font-size: 14px;
  display: inline-flex; align-items: center; gap: 8px;
  text-decoration: none;
}
.vocab-hero-btn:hover { background: #fff; transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,0,0,0.15);}
.vocab-hero-btn.outline { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,0.6); }
.vocab-hero-btn.outline:hover { background: rgba(255,255,255,0.18); }

.vocab-tabs { display: flex; gap: 6px; margin-bottom: 16px; flex-wrap: wrap; }
.vocab-tab {
  padding: 9px 18px; font-size: 13px; font-weight: 700;
  border: 1.5px solid var(--border); background: #fff; color: var(--text-muted);
  border-radius: 999px; cursor: pointer; transition: all 0.15s;
}
.vocab-tab.active { background: var(--primary); color: #fff; border-color: var(--primary);}
.vocab-tab:hover:not(.active) { border-color: var(--primary); color: var(--primary); }

.vocab-grid {
  display: grid; gap: 16px;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}
.vocab-card {
  background: var(--surface); border: 1.5px solid var(--border); border-radius: 16px;
  padding: 0; cursor: pointer; transition: all 0.2s;
  text-decoration: none; color: inherit; display: block; overflow: hidden;
  box-shadow: var(--shadow);
}
.vocab-card:hover { transform: translateY(-3px); box-shadow: 0 12px 28px rgba(0,0,0,0.1); border-color: var(--primary);}
.vocab-card-banner {
  height: 70px; padding: 14px 18px;
  display: flex; align-items: center; gap: 10px;
  color: #fff; font-weight: 800; font-size: 22px;
}
.vocab-card-body { padding: 14px 18px 18px; }
.vocab-card-title { font-size: 15px; font-weight: 800; margin-bottom: 4px; color: var(--text); line-height: 1.35; }
.vocab-card-desc  { font-size: 12px; color: var(--text-muted); margin-bottom: 10px; min-height: 32px; line-height: 1.5; }
.vocab-card-meta { display: flex; align-items: center; gap: 10px; font-size: 12px; color: var(--text-muted); }
.vocab-card-pill { background: var(--primary-light); color: var(--primary); padding: 2px 10px; border-radius: 999px; font-weight: 700; font-size: 11px;}
.vocab-card-progress { height: 6px; background: #f1f5f9; border-radius: 999px; overflow: hidden; margin: 10px 0 0;}
.vocab-card-progress > div { height: 100%; background: linear-gradient(90deg, var(--success), #22c55e); border-radius: 999px; transition: width 0.3s;}

/* ── Create page ── */
.vc-tabs { display: flex; gap: 4px; margin-bottom: 22px; background: #f1f5f9; padding: 5px; border-radius: 12px; }
.vc-tab {
  flex: 1; padding: 11px 14px; font-size: 14px; font-weight: 700;
  border: none; background: transparent; color: var(--text-muted);
  border-radius: 9px; cursor: pointer; transition: all 0.15s;
}
.vc-tab.active { background: #fff; color: var(--primary); box-shadow: var(--shadow); }
.vc-panel { display: none; }
.vc-panel.active { display: block; }

.vc-input, .vc-textarea, .vc-select {
  width: 100%; padding: 11px 14px; font-size: 15px; font-family: inherit;
  border: 1.5px solid var(--border); border-radius: 10px; outline: none; transition: border-color 0.2s;
}
.vc-input:focus, .vc-textarea:focus, .vc-select:focus { border-color: var(--primary); }
.vc-textarea { resize: vertical; min-height: 120px; line-height: 1.6; }

.vc-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 640px) { .vc-row { grid-template-columns: 1fr; } }

.vc-label { display: block; font-size: 13px; font-weight: 700; color: var(--text); margin-bottom: 6px;}

.vc-icon-pick { display: flex; flex-wrap: wrap; gap: 6px; }
.vc-icon-pick button {
  width: 40px; height: 40px; border: 1.5px solid var(--border); background: #fff;
  border-radius: 10px; cursor: pointer; font-size: 20px; transition: all 0.15s;
}
.vc-icon-pick button.active, .vc-icon-pick button:hover { border-color: var(--primary); transform: scale(1.05); }

.vc-color-pick { display: flex; flex-wrap: wrap; gap: 6px; }
.vc-color-pick button {
  width: 32px; height: 32px; border-radius: 50%; border: 3px solid transparent;
  cursor: pointer; transition: transform 0.15s;
}
.vc-color-pick button.active { border-color: var(--text); transform: scale(1.12); }

/* Manual editor table (div-based grid) */
.vc-term-table { width: 100%; }
.vc-term-table th { text-align: left; font-size: 11px; font-weight: 700; color: var(--text-muted); padding: 4px 8px; }
.vc-term-head {
  display: grid; grid-template-columns: 36px 1fr 1fr 36px; gap: 10px;
  padding: 4px 10px 6px;
}
.vc-term-head > div { font-size: 11px; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.4px; }
.vc-term-row {
  background: #fff; border: 1.5px solid var(--border); border-radius: 10px;
  display: grid; grid-template-columns: 36px 1fr 1fr 36px; gap: 10px; align-items: center; padding: 8px 10px; margin-bottom: 6px;
}
.vc-term-row input {
  border: none; background: transparent; font-size: 14px; padding: 6px 4px; outline: none;
  width: 100%; border-bottom: 1px solid transparent;
}
.vc-term-row input:focus { border-bottom-color: var(--primary); }
.vc-term-num { font-size: 13px; font-weight: 700; color: var(--text-muted); text-align: center; }
.vc-term-del { background: transparent; border: none; color: var(--text-muted); cursor: pointer; font-size: 18px; transition: color 0.15s; }
.vc-term-del:hover { color: var(--danger); }

/* AI loading */
.vc-ai-loading {
  display: flex; flex-direction: column; align-items: center; gap: 14px;
  padding: 40px 20px; text-align: center; color: var(--text-muted);
}
.vc-spinner {
  width: 38px; height: 38px;
  border: 4px solid #e2e8f0; border-top-color: var(--primary);
  border-radius: 50%; animation: vc-spin 0.8s linear infinite;
}
@keyframes vc-spin { to { transform: rotate(360deg); } }

/* Preview cards (after AI) */
.vc-preview-grid { display: grid; gap: 8px; }
.vc-preview-card {
  background: #fff; border: 1.5px solid var(--border); border-radius: 10px; padding: 12px 14px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px; align-items: start;
}
.vc-preview-card .term { font-weight: 800; font-size: 15px; color: var(--text); }
.vc-preview-card .term .pron { font-weight: 500; color: var(--text-muted); font-size: 13px; margin-left: 6px;}
.vc-preview-card .pos { display: inline-block; background: #fffbeb; color: #b45309; font-size: 10px; font-weight: 700; padding: 1px 8px; border-radius: 999px; margin-top: 2px;}
.vc-preview-card .meaning { font-size: 14px; color: var(--text); }
.vc-preview-card .ex { grid-column: 1 / -1; font-size: 12px; color: var(--text-muted); padding-top: 6px; border-top: 1px dashed var(--border); margin-top: 4px; line-height: 1.6; font-style: italic;}
.vc-preview-card .syn { grid-column: 1 / -1; font-size: 12px; color: var(--text); padding-top: 4px; line-height: 1.5;}
.vc-preview-card .syn span[contenteditable] { color: #047857; font-weight: 600;}
.vc-preview-card.is-pair { background: linear-gradient(135deg, #ecfdf5 0%, #fff 60%); border-color: #6ee7b7;}
.vc-preview-card.is-pair .syn span[contenteditable] { color: #065f46;}
.vc-pair-badge {
  display: inline-block; margin-top: 4px; margin-left: 6px;
  background: #d1fae5; color: #065f46; font-size: 10px; font-weight: 700;
  padding: 2px 9px; border-radius: 999px; letter-spacing: 0.2px;
}

/* ============================================================
   STUDY PAGE — Flashcards / Learn / Match / Test
   ============================================================ */
.study-shell {
  max-width: 900px; margin: 0 auto;
}
.study-header {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  margin-bottom: 20px; padding: 18px 22px;
  background: linear-gradient(135deg, var(--primary) 0%, #ff6b6b 100%);
  border-radius: 16px; color: #fff;
}
.study-header h1 { font-size: 20px; font-weight: 900; margin-bottom: 2px;}
.study-header .meta { font-size: 13px; opacity: 0.9;}
.study-header .progress-mini { background: rgba(255,255,255,0.18); padding: 8px 14px; border-radius: 10px; font-size: 13px; font-weight: 700;}

.mode-switch { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 22px; }
.mode-btn {
  padding: 10px 18px; font-size: 13px; font-weight: 700;
  background: #fff; border: 1.5px solid var(--border); color: var(--text-muted);
  border-radius: 12px; cursor: pointer; display: inline-flex; align-items: center; gap: 6px; transition: all 0.15s;
}
.mode-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); box-shadow: 0 4px 12px rgba(221,0,0,0.25);}
.mode-btn:hover:not(.active) { border-color: var(--primary); color: var(--primary); }

/* Flashcard */
.fc-stage {
  perspective: 1200px;
  display: flex; flex-direction: column; align-items: center;
}
.fc-card {
  width: 100%; max-width: 600px; min-height: 320px;
  position: relative; transform-style: preserve-3d;
  transition: transform 0.55s cubic-bezier(.4,.2,.2,1);
  cursor: pointer;
  user-select: none;
}
.fc-card.flipped { transform: rotateY(180deg); }
.fc-face {
  position: absolute; inset: 0;
  background: var(--surface); border-radius: 22px;
  border: 1.5px solid var(--border);
  box-shadow: 0 8px 32px rgba(0,0,0,0.08);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 32px;
  backface-visibility: hidden;
  text-align: center;
}
.fc-face.back { transform: rotateY(180deg); background: linear-gradient(135deg, #e0f2fe 0%, #ede9fe 100%); }
.fc-term {
  font-size: 36px; font-weight: 900; color: var(--text); margin-bottom: 8px; line-height: 1.25;
  word-break: break-word;
}
.fc-pron { color: var(--text-muted); font-size: 16px; margin-bottom: 8px; font-style: italic; }
.fc-pos {
  display: inline-block; background: #fffbeb; color: #b45309; font-size: 11px; font-weight: 800;
  padding: 3px 12px; border-radius: 999px; margin-top: 8px; letter-spacing: 0.04em; text-transform: uppercase;
}
.fc-meaning { font-size: 26px; font-weight: 800; color: var(--primary); margin-bottom: 14px; line-height: 1.4;}
.fc-example { font-size: 14px; color: var(--text-muted); font-style: italic; line-height: 1.65; max-width: 90%; }
.fc-example b { color: var(--text); }
.fc-audio-btn {
  position: absolute; top: 18px; right: 18px;
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--primary-light); border: none; color: var(--primary);
  font-size: 18px; cursor: pointer; transition: all 0.15s;
}
.fc-audio-btn:hover { background: var(--primary); color: #fff; transform: scale(1.08); }
.fc-star {
  position: absolute; top: 18px; left: 18px;
  width: 40px; height: 40px; border-radius: 50%;
  background: transparent; border: none; color: #cbd5e1;
  font-size: 22px; cursor: pointer; transition: all 0.15s;
}
.fc-star.active, .fc-star:hover { color: #f59e0b; transform: scale(1.1); }

.fc-controls {
  display: flex; align-items: center; justify-content: center; gap: 16px; margin-top: 22px; flex-wrap: wrap;
}
.fc-nav-btn {
  width: 52px; height: 52px; border-radius: 50%; background: var(--surface);
  border: 1.5px solid var(--border); cursor: pointer; font-size: 20px; color: var(--text-muted); transition: all 0.15s;
}
.fc-nav-btn:hover { border-color: var(--primary); color: var(--primary); }
.fc-nav-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.fc-counter { font-size: 14px; font-weight: 700; color: var(--text-muted); min-width: 80px; text-align: center;}
.fc-shuffle, .fc-reset {
  padding: 9px 14px; font-size: 13px; font-weight: 700; border: 1.5px solid var(--border);
  background: #fff; color: var(--text-muted); border-radius: 10px; cursor: pointer; transition: all 0.15s;
}
.fc-shuffle:hover, .fc-reset:hover { border-color: var(--primary); color: var(--primary); }

.fc-progress-bar {
  width: 100%; max-width: 600px; height: 6px; background: #f1f5f9; border-radius: 999px; overflow: hidden;
  margin-top: 14px;
}
.fc-progress-bar > div { height: 100%; background: linear-gradient(90deg, var(--primary), #ff6b6b); transition: width 0.35s; border-radius: 999px;}

/* Learn / Test mode */
.lq-card {
  background: var(--surface); border: 1.5px solid var(--border); border-radius: 18px;
  padding: 32px; max-width: 700px; margin: 0 auto;
  box-shadow: var(--shadow);
}
.lq-prompt-label { font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-muted); font-weight: 700; margin-bottom: 8px;}
.lq-prompt {
  font-size: 28px; font-weight: 900; color: var(--text); margin-bottom: 8px; line-height: 1.3;
}
.lq-prompt .pron { font-weight: 500; font-size: 17px; color: var(--text-muted); margin-left: 8px; font-style: italic; }
.lq-hint { font-size: 13px; color: var(--text-muted); margin-bottom: 22px; }
.lq-options { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
@media (max-width: 600px) { .lq-options { grid-template-columns: 1fr; } }
.lq-option {
  padding: 14px 16px; font-size: 15px; font-weight: 600;
  background: #fff; border: 2px solid var(--border); border-radius: 12px;
  cursor: pointer; text-align: left; transition: all 0.15s;
}
.lq-option:hover:not(.disabled) { border-color: var(--primary); background: #fff5f5;}
.lq-option.correct { background: #dcfce7; border-color: #16a34a; color: #166534; }
.lq-option.incorrect { background: #fee2e2; border-color: #dc2626; color: #991b1b; }
.lq-option.disabled { cursor: not-allowed; opacity: 0.7;}

.lq-answer-input {
  width: 100%; padding: 14px 16px; font-size: 18px;
  border: 2px solid var(--border); border-radius: 12px; outline: none; transition: border-color 0.15s;
}
.lq-answer-input:focus { border-color: var(--primary); }
.lq-answer-input.correct { border-color: #16a34a; background: #dcfce7;}
.lq-answer-input.incorrect { border-color: #dc2626; background: #fee2e2;}

.lq-submit {
  margin-top: 14px; padding: 12px 24px; font-size: 14px; font-weight: 700;
  background: var(--primary); color: #fff; border: none; border-radius: 10px; cursor: pointer;
}
.lq-submit:hover { background: var(--primary-dark); }

.lq-feedback { margin-top: 14px; padding: 12px 16px; border-radius: 10px; font-size: 14px; font-weight: 600; }
.lq-feedback.ok { background: #dcfce7; color: #166534;}
.lq-feedback.fail { background: #fef3c7; color: #92400e;}

/* Match game */
.match-board {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px;
  max-width: 800px; margin: 0 auto;
}
@media (max-width: 768px) { .match-board { grid-template-columns: repeat(2, 1fr); } }
.match-tile {
  background: #fff; border: 2px solid var(--border); border-radius: 12px;
  padding: 16px 14px; min-height: 80px; cursor: pointer;
  display: flex; align-items: center; justify-content: center; text-align: center;
  font-size: 14px; font-weight: 600; color: var(--text);
  transition: all 0.15s;
  user-select: none;
}
.match-tile:hover:not(.matched):not(.selected) { border-color: var(--primary); background: #fff5f5; }
.match-tile.selected { border-color: var(--primary); background: #fff5f5; transform: scale(1.04); }
.match-tile.matched { opacity: 0.25; cursor: default; pointer-events: none; }
.match-tile.flash-correct { background: #dcfce7 !important; border-color: #16a34a !important; }
.match-tile.flash-wrong { background: #fee2e2 !important; border-color: #dc2626 !important; }

.match-stats {
  display: flex; justify-content: center; gap: 28px; margin-bottom: 16px;
  font-size: 14px; font-weight: 700; color: var(--text-muted);
}
.match-stats span b { color: var(--text); font-weight: 900; }

/* Test result */
.result-card {
  text-align: center; padding: 36px 22px; max-width: 520px; margin: 30px auto;
  background: linear-gradient(135deg, #f0fdf4 0%, #ecfeff 100%);
  border: 1.5px solid #86efac; border-radius: 18px;
}
.result-card.fail { background: linear-gradient(135deg, #fef2f2 0%, #fff7ed 100%); border-color: #fca5a5;}
.result-score { font-size: 56px; font-weight: 900; color: #16a34a; margin: 14px 0;}
.result-card.fail .result-score { color: #dc2626; }
.result-card h2 { font-size: 22px; font-weight: 900; }
.result-card .actions { display: flex; gap: 10px; margin-top: 22px; justify-content: center; flex-wrap: wrap;}
.result-card .btn-primary, .result-card .btn-outline {
  padding: 11px 22px; font-size: 14px; font-weight: 700;
  border-radius: 10px; cursor: pointer; text-decoration: none;
  display: inline-block;
}
.result-card .btn-outline { background: #fff; color: var(--primary); border: 1.5px solid var(--primary); }

/* Sticky bottom action bar (study) */
.study-bottom-bar {
  display: flex; gap: 10px; justify-content: center; align-items: center;
  padding: 14px 0;
  flex-wrap: wrap;
}

/* Mobile tweaks */
@media (max-width: 720px) {
  .fc-term { font-size: 28px; }
  .fc-meaning { font-size: 22px; }
  .lq-prompt { font-size: 22px; }
  .study-header { flex-direction: column; align-items: flex-start; }
  .study-header h1 { font-size: 18px; }
}

/* ============================================================
   Saved-vocab grouped list (vocabulary.html)
   ============================================================ */
.rd-group {
  border: 1.5px solid var(--border);
  background: var(--surface);
  transition: box-shadow 0.18s, border-color 0.18s;
}
.rd-group:hover {
  border-color: var(--primary-light, #fca5a5);
  box-shadow: 0 6px 18px rgba(221, 0, 0, 0.06);
}
.rd-group-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(221, 0, 0, 0.025), transparent);
}
.rd-group-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 2px;
}
.rd-group-sub {
  font-size: 12px;
  color: var(--text-muted);
}
.rd-group-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}
.rd-create-btn {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.15s, transform 0.1s;
  white-space: nowrap;
}
.rd-create-btn:hover { filter: brightness(1.08); }
.rd-create-btn:active { transform: scale(0.97); }
.rd-del-group-btn,
.rd-toggle {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  width: 34px;
  height: 34px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 14px;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.rd-del-group-btn:hover {
  background: #fef2f2;
  color: var(--danger, #dc2626);
  border-color: #fca5a5;
}
.rd-toggle:hover {
  background: var(--surface-hover, #f8fafc);
  color: var(--text);
}
.rd-group-body {
  max-height: 1200px;
  overflow: hidden;
  transition: max-height 0.25s ease, padding 0.25s ease;
}
.rd-group-body.collapsed {
  max-height: 0;
  padding-top: 0;
  padding-bottom: 0;
}
.rd-item-list {
  list-style: none;
  margin: 0;
  padding: 4px 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0;
}
.rd-item {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 18px;
  border-top: 1px solid var(--border);
  transition: background 0.12s;
}
.rd-item:hover { background: rgba(221, 0, 0, 0.025); }
.rd-item-text {
  flex: 1;
  min-width: 0;
}
.rd-item-word {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  word-break: break-word;
}
.rd-item-syn {
  font-size: 12.5px;
  color: var(--text-muted);
  margin-top: 2px;
  word-break: break-word;
}
.rd-item-del {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 18px;
  width: 26px;
  height: 26px;
  border-radius: 6px;
  cursor: pointer;
  flex-shrink: 0;
  line-height: 1;
  transition: background 0.12s, color 0.12s;
}
.rd-item-del:hover {
  background: #fef2f2;
  color: var(--danger, #dc2626);
}

@media (max-width: 720px) {
  .rd-group-head { flex-wrap: wrap; }
  .rd-group-actions { width: 100%; justify-content: flex-end; }
  .rd-item-list { grid-template-columns: 1fr; }
}

/* ============================================================
   Phase toggle pill — dùng cho xé câu (translation + writing)
   Cho phép user nhảy về bất kỳ phase nào để redo
   ============================================================ */
.phase-toggle {
  display: inline-flex;
  align-items: stretch;
  gap: 0;
  background: #f1f5f9;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 3px;
  font-size: 12px;
  font-weight: 600;
  user-select: none;
  flex-wrap: nowrap;
}
.phase-toggle button {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 6px 12px;
  border-radius: 7px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  font-family: inherit;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s, transform 0.08s;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  line-height: 1.2;
}
.phase-toggle button:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.6);
}
.phase-toggle button:active { transform: scale(0.96); }
.phase-toggle button.active {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.08);
}
/* Forward steps are display-only ("just for show") — no click action */
.phase-toggle button.phase-forward {
  cursor: default;
  opacity: 0.55;
}
.phase-toggle button.phase-forward:hover {
  background: transparent;
  color: var(--text-muted);
  transform: none;
}
.phase-toggle-hint {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  font-style: italic;
}
@media (max-width: 720px) {
  .phase-toggle-hint { display: none; }
}
.phase-toggle .phase-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #cbd5e1;
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  flex-shrink: 0;
}
.phase-toggle button.active .phase-num {
  background: var(--primary);
}
@media (max-width: 720px) {
  .phase-toggle button { padding: 6px 8px; font-size: 11px; }
  .phase-toggle .phase-label-long { display: none; }
}