/* ============================================================
   STUDENTMASTERY OS — Complete Design System
   ============================================================ */

/* --- Variables --- */
:root {
  --bg: #070d1a;
  --surface: #0f1729;
  --card: #131f35;
  --card-hover: #192848;
  --border: rgba(99,102,241,0.15);
  --border-light: rgba(255,255,255,0.06);
  --accent: #6366f1;
  --accent-dim: rgba(99,102,241,0.15);
  --accent-glow: rgba(99,102,241,0.3);
  --green: #10b981;
  --green-dim: rgba(16,185,129,0.15);
  --yellow: #f59e0b;
  --yellow-dim: rgba(245,158,11,0.15);
  --red: #ef4444;
  --red-dim: rgba(239,68,68,0.15);
  --blue: #3b82f6;
  --blue-dim: rgba(59,130,246,0.15);
  --purple: #a855f7;
  --purple-dim: rgba(168,85,247,0.15);
  --cyan: #06b6d4;
  --pink: #ec4899;
  --text: #f0f4ff;
  --text-2: #94a3b8;
  --text-3: #475569;
  --sidebar-w: 260px;
  --sidebar-collapsed: 64px;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --transition: 0.2s ease;
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  font-size: 14px;
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; cursor: pointer; }
button { cursor: pointer; font-family: inherit; }
input, select, textarea {
  font-family: inherit;
  font-size: 14px;
  color: var(--text);
}
img { max-width: 100%; }
.hidden { display: none !important; }
.mt-2 { margin-top: 12px; }

/* --- Layout --- */
#app {
  display: flex;
  min-height: 100vh;
}

/* --- Sidebar --- */
.sidebar {
  width: var(--sidebar-w);
  min-height: 100vh;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  left: 0; top: 0; bottom: 0;
  z-index: 100;
  transition: width var(--transition);
  overflow: hidden;
}
.sidebar.collapsed { width: var(--sidebar-collapsed); }
.sidebar.collapsed .nav-label,
.sidebar.collapsed .logo-text,
.sidebar.collapsed .user-info,
.sidebar.collapsed .sidebar-xp,
.sidebar.collapsed .sidebar-streak,
.sidebar.collapsed .nav-section-label,
.sidebar.collapsed .nav-badge { display: none; }

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 16px 16px;
  border-bottom: 1px solid var(--border-light);
}
.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo-icon { font-size: 24px; }
.logo-text {
  font-weight: 700;
  font-size: 15px;
  background: linear-gradient(135deg, #818cf8, #a855f7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
}
.sidebar-toggle {
  background: none;
  border: none;
  color: var(--text-2);
  font-size: 18px;
  padding: 4px;
  border-radius: 6px;
  transition: background var(--transition);
}
.sidebar-toggle:hover { background: var(--accent-dim); color: var(--accent); }

.sidebar-user {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  cursor: pointer;
}
.user-avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--purple));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
  flex-shrink: 0;
}
.user-name { font-weight: 600; font-size: 13px; white-space: nowrap; }
.user-level { font-size: 11px; color: var(--accent); white-space: nowrap; }

.sidebar-xp { padding: 0 16px 10px; }
.xp-bar-label { display: flex; justify-content: space-between; font-size: 11px; color: var(--text-2); margin-bottom: 4px; }
.xp-bar { height: 5px; background: var(--border-light); border-radius: 3px; overflow: hidden; }
.xp-fill { height: 100%; background: linear-gradient(90deg, var(--accent), var(--purple)); border-radius: 3px; transition: width 0.5s ease; }

.sidebar-streak {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 16px 12px;
  font-size: 12px;
  color: var(--text-2);
}
.streak-fire { font-size: 16px; }
#streak-count { font-weight: 700; color: var(--yellow); font-size: 16px; }

.sidebar-nav { flex: 1; overflow-y: auto; padding: 8px 8px 20px; }
.sidebar-nav::-webkit-scrollbar { width: 3px; }
.sidebar-nav::-webkit-scrollbar-track { background: transparent; }
.sidebar-nav::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

.nav-section-label {
  font-size: 10px;
  font-weight: 600;
  color: var(--text-3);
  letter-spacing: 0.08em;
  padding: 14px 10px 6px;
  white-space: nowrap;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border-radius: var(--radius-sm);
  color: var(--text-2);
  transition: all var(--transition);
  cursor: pointer;
  position: relative;
  white-space: nowrap;
  margin-bottom: 1px;
}
.nav-item:hover { background: var(--accent-dim); color: var(--text); }
.nav-item.active { background: var(--accent-dim); color: var(--accent); font-weight: 600; }
.nav-item.active::before {
  content: '';
  position: absolute;
  left: -8px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 60%;
  background: var(--accent);
  border-radius: 0 3px 3px 0;
}
.nav-icon { font-size: 16px; min-width: 20px; text-align: center; }
.nav-label { font-size: 13px; flex: 1; }
.nav-badge {
  background: var(--red);
  color: white;
  font-size: 10px;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 10px;
  min-width: 18px;
  text-align: center;
}
.nav-badge.new { background: var(--accent); animation: pulse 2s infinite; }

/* --- Main Content --- */
.main {
  margin-left: var(--sidebar-w);
  flex: 1;
  min-height: 100vh;
  padding: 0;
  transition: margin-left var(--transition);
  background: var(--bg);
}
.sidebar.collapsed ~ .main { margin-left: var(--sidebar-collapsed); }

/* --- Views --- */
.view { display: none; padding: 28px 32px; }
.view.active { display: block; }

.view-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 28px;
  gap: 16px;
  flex-wrap: wrap;
}
.view-header h1 { font-size: 26px; font-weight: 700; letter-spacing: -0.3px; }
.view-subtitle { color: var(--text-2); font-size: 14px; margin-top: 4px; }
.header-actions { display: flex; gap: 10px; align-items: center; flex-shrink: 0; }

/* --- Cards --- */
.card {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.card:hover { border-color: var(--border); }
.card-accent {
  background: linear-gradient(135deg, rgba(99,102,241,0.1), rgba(168,85,247,0.1));
  border-color: var(--accent-dim);
}
.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.card-header h3 { font-size: 15px; font-weight: 600; }
.card-tag {
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
}

/* --- Stats Grid --- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}
.stat-card {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: all var(--transition);
}
.stat-card:hover { border-color: var(--accent-dim); transform: translateY(-1px); }
.stat-icon { font-size: 22px; }
.stat-value { font-size: 26px; font-weight: 700; color: var(--text); line-height: 1; }
.stat-label { font-size: 12px; color: var(--text-2); }
.stat-change { font-size: 11px; }
.stat-change.up { color: var(--green); }
.stat-change.down { color: var(--red); }

/* --- Section Layout --- */
.section-row { display: grid; grid-template-columns: 1fr 340px; gap: 16px; }
.section-col-wide { display: flex; flex-direction: column; gap: 16px; }
.section-col-narrow { display: flex; flex-direction: column; gap: 16px; }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  border: none;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  color: white;
}
.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); box-shadow: 0 4px 16px var(--accent-glow); }
.btn-ghost {
  background: transparent;
  color: var(--text-2);
  border: 1px solid var(--border-light);
}
.btn-ghost:hover { background: var(--card-hover); color: var(--text); border-color: var(--border); }
.btn-danger { background: var(--red); color: white; }
.btn-success { background: var(--green); color: white; }
.btn-sm { padding: 5px 12px; font-size: 12px; }
.btn-lg { padding: 13px 28px; font-size: 15px; }
.btn-full { width: 100%; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none !important; }

/* --- Form Elements --- */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 12px; font-weight: 600; color: var(--text-2); margin-bottom: 6px; text-transform: uppercase; letter-spacing: 0.05em; }
input[type="text"],
input[type="number"],
input[type="email"],
textarea,
select {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  color: var(--text);
  font-size: 14px;
  transition: border-color var(--transition);
  outline: none;
}
input:focus, select:focus, textarea:focus { border-color: var(--accent); }
.select-input {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
}

/* --- Progress Bars --- */
.progress-bar { height: 8px; background: var(--border-light); border-radius: 4px; overflow: hidden; }
.progress-fill {
  height: 100%;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--accent), var(--purple));
  transition: width 0.6s ease;
}
.progress-sm { height: 5px; }
.progress-lg { height: 12px; }

/* --- Badges --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
}
.badge-level { background: var(--accent-dim); color: var(--accent); }
.badge-green { background: var(--green-dim); color: var(--green); }
.badge-yellow { background: var(--yellow-dim); color: var(--yellow); }
.badge-red { background: var(--red-dim); color: var(--red); }
.badge-purple { background: var(--purple-dim); color: var(--purple); }

/* --- Level Indicator --- */
.level-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
}

/* --- Onboarding --- */
.onboarding-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.95);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.onboarding-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 40px;
  max-width: 540px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
}
.onboarding-step { display: none; }
.onboarding-step.active { display: block; }
.ob-hero { text-align: center; margin-bottom: 32px; }
.ob-icon { font-size: 64px; margin-bottom: 16px; }
.ob-hero h1 { font-size: 30px; font-weight: 800; background: linear-gradient(135deg, #818cf8, #a855f7, #ec4899); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.ob-sub { color: var(--text-2); margin-top: 8px; font-size: 15px; }
.ob-features { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 28px; }
.ob-feat {
  display: flex; align-items: center; gap: 8px;
  background: var(--surface); border-radius: var(--radius-sm);
  padding: 10px 14px; font-size: 13px; color: var(--text-2);
}
.ob-feat span:first-child { font-size: 18px; }
.ob-nav { display: flex; justify-content: space-between; gap: 12px; margin-top: 24px; }
.ob-form { display: flex; flex-direction: column; gap: 0; }

.goal-selector { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 20px 0; }
.goal-option {
  background: var(--surface);
  border: 2px solid var(--border-light);
  border-radius: var(--radius);
  padding: 20px 14px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
}
.goal-option:hover { border-color: var(--accent-dim); }
.goal-option.active { border-color: var(--accent); background: var(--accent-dim); }
.goal-emoji { font-size: 30px; margin-bottom: 8px; }
.goal-label { font-weight: 700; font-size: 14px; }
.goal-time { color: var(--accent); font-size: 13px; font-weight: 600; margin: 4px 0; }
.goal-desc { font-size: 11px; color: var(--text-2); }

/* --- Dashboard --- */
.daily-mission-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  margin-bottom: 8px;
  cursor: pointer;
  transition: all var(--transition);
}
.daily-mission-item:hover { background: var(--card-hover); }
.daily-mission-item.done { opacity: 0.6; }
.mission-checkbox {
  width: 22px; height: 22px;
  border: 2px solid var(--border);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition);
}
.daily-mission-item.done .mission-checkbox { background: var(--green); border-color: var(--green); }
.mission-info { flex: 1; }
.mission-title { font-size: 13px; font-weight: 500; }
.mission-meta { font-size: 11px; color: var(--text-2); }
.mission-xp { font-size: 12px; color: var(--yellow); font-weight: 600; }

.topic-progress-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border-light);
}
.topic-progress-item:last-child { border-bottom: none; }
.topic-emoji { font-size: 20px; min-width: 28px; text-align: center; }
.topic-info { flex: 1; }
.topic-name { font-size: 13px; font-weight: 500; }
.topic-level-label { font-size: 11px; color: var(--text-2); }
.topic-progress-bar { width: 100px; }
.topic-level-num { font-size: 12px; font-weight: 700; color: var(--accent); min-width: 30px; text-align: right; }

/* Quote Card */
.quote-icon { font-size: 28px; margin-bottom: 10px; }
.quote-text { font-size: 14px; line-height: 1.7; font-style: italic; color: var(--text-2); margin-bottom: 10px; }
.quote-author { font-size: 12px; color: var(--accent); font-weight: 600; }

/* Streak Calendar */
.streak-calendar-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; }
.streak-day {
  aspect-ratio: 1;
  border-radius: 3px;
  background: var(--surface);
  transition: background var(--transition);
  position: relative;
}
.streak-day.studied { background: var(--green); }
.streak-day.today { box-shadow: 0 0 0 2px var(--accent); }
.streak-day-labels { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; margin-bottom: 4px; }
.streak-day-label { font-size: 9px; color: var(--text-3); text-align: center; }

/* SR Queue Preview */
.sr-queue-stat { text-align: center; padding: 10px 0; }
.sr-queue-num { font-size: 36px; font-weight: 800; color: var(--accent); }
.sr-queue-label { font-size: 12px; color: var(--text-2); }
.sr-queue-breakdown { display: flex; gap: 8px; justify-content: center; margin-top: 8px; }

/* --- Roadmap --- */
.roadmap-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}
.roadmap-topic-card {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.roadmap-topic-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--topic-color, var(--accent));
  opacity: 0.6;
}
.roadmap-topic-card:hover {
  border-color: var(--accent-dim);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.rtc-header { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.rtc-emoji { font-size: 26px; }
.rtc-name { font-size: 15px; font-weight: 700; }
.rtc-desc { font-size: 12px; color: var(--text-2); margin-top: 2px; }
.rtc-level {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}
.rtc-level-label { font-size: 12px; color: var(--text-2); }
.rtc-level-value { font-size: 13px; font-weight: 700; color: var(--accent); }
.rtc-mastery-steps { display: flex; gap: 3px; margin-bottom: 12px; }
.mastery-step {
  flex: 1;
  height: 6px;
  border-radius: 3px;
  background: var(--border-light);
  transition: background 0.3s ease;
}
.mastery-step.done { background: var(--accent); }
.mastery-step.current { background: var(--accent); opacity: 0.5; animation: pulse 1.5s infinite; }
.rtc-footer { display: flex; justify-content: space-between; align-items: center; }

/* Filter Buttons */
.roadmap-filters { display: flex; gap: 8px; }
.filter-btn {
  background: var(--card);
  border: 1px solid var(--border-light);
  color: var(--text-2);
  padding: 7px 16px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  transition: all var(--transition);
}
.filter-btn.active, .filter-btn:hover { background: var(--accent-dim); color: var(--accent); border-color: var(--accent-dim); }

/* --- Curriculum --- */
.curriculum-topic {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}
.curriculum-topic-header {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  cursor: pointer;
  transition: background var(--transition);
}
.curriculum-topic-header:hover { background: var(--card-hover); }
.ct-emoji { font-size: 22px; }
.ct-info { flex: 1; }
.ct-name { font-size: 15px; font-weight: 700; }
.ct-meta { font-size: 12px; color: var(--text-2); }
.ct-expand { color: var(--text-2); transition: transform var(--transition); font-size: 18px; }
.curriculum-topic.open .ct-expand { transform: rotate(180deg); }
.curriculum-topic-body { display: none; padding: 0 20px 20px; border-top: 1px solid var(--border-light); }
.curriculum-topic.open .curriculum-topic-body { display: block; }
.curriculum-levels { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 10px; margin-top: 16px; }
.curriculum-level {
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 14px;
  cursor: pointer;
  transition: all var(--transition);
  border: 1px solid transparent;
}
.curriculum-level:hover { border-color: var(--accent-dim); }
.curriculum-level.unlocked { border-color: var(--green-dim); }
.curriculum-level.current { border-color: var(--accent); }
.cl-num { font-size: 11px; color: var(--text-3); font-weight: 600; letter-spacing: 0.05em; }
.cl-title { font-size: 14px; font-weight: 700; margin: 4px 0; }
.cl-desc { font-size: 12px; color: var(--text-2); }

/* --- Lessons --- */
.lessons-topic-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 20px; }
.topic-tab {
  background: var(--card);
  border: 1px solid var(--border-light);
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 12px;
  cursor: pointer;
  transition: all var(--transition);
}
.topic-tab.active, .topic-tab:hover { background: var(--accent-dim); color: var(--accent); border-color: var(--accent-dim); }

.lesson-card {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-bottom: 10px;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 16px;
}
.lesson-card:hover { border-color: var(--accent-dim); transform: translateX(3px); }
.lesson-level-badge {
  width: 40px; height: 40px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 15px;
  flex-shrink: 0;
  background: var(--accent-dim);
  color: var(--accent);
}
.lesson-info { flex: 1; }
.lesson-title { font-size: 14px; font-weight: 700; margin-bottom: 4px; }
.lesson-meta { font-size: 12px; color: var(--text-2); }
.lesson-tags { display: flex; gap: 6px; margin-top: 6px; flex-wrap: wrap; }
.lesson-tag { background: var(--surface); font-size: 10px; color: var(--text-3); padding: 2px 8px; border-radius: 4px; }
.lesson-action { color: var(--text-3); font-size: 18px; }

/* Lesson Detail */
#lesson-detail-content {
  max-width: 820px;
  margin: 0 auto;
  padding: 28px 32px;
}
.lesson-back {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--text-2); font-size: 13px; margin-bottom: 20px;
  cursor: pointer;
}
.lesson-back:hover { color: var(--accent); }
.lesson-hero {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 24px;
}
.lesson-hero-top { display: flex; gap: 16px; align-items: flex-start; margin-bottom: 16px; }
.lesson-hero-emoji { font-size: 40px; }
.lesson-hero-info { flex: 1; }
.lesson-hero-level { font-size: 11px; color: var(--accent); font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; }
.lesson-hero-title { font-size: 24px; font-weight: 800; margin: 4px 0; }
.lesson-hero-desc { font-size: 14px; color: var(--text-2); }
.lesson-meta-row { display: flex; gap: 16px; flex-wrap: wrap; }
.lesson-meta-item { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--text-2); }

.lesson-body { line-height: 1.8; }
.lesson-section { margin-bottom: 28px; }
.lesson-section h2 { font-size: 18px; font-weight: 700; margin-bottom: 14px; color: var(--text); border-bottom: 1px solid var(--border-light); padding-bottom: 8px; }
.lesson-section h3 { font-size: 15px; font-weight: 600; margin: 16px 0 10px; color: var(--text); }
.lesson-section p { font-size: 14px; color: var(--text-2); margin-bottom: 12px; }
.lesson-section ul, .lesson-section ol { padding-left: 20px; color: var(--text-2); font-size: 14px; }
.lesson-section li { margin-bottom: 8px; }
.lesson-section strong { color: var(--text); }

.callout {
  background: var(--accent-dim);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 14px 18px;
  margin: 16px 0;
  font-size: 13px;
  color: var(--text-2);
}
.callout.green { background: var(--green-dim); border-color: var(--green); }
.callout.yellow { background: var(--yellow-dim); border-color: var(--yellow); }
.callout.red { background: var(--red-dim); border-color: var(--red); }
.callout-title { font-weight: 700; color: var(--text); margin-bottom: 4px; }

.technique-card {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 16px;
  margin-bottom: 12px;
}
.technique-name { font-size: 14px; font-weight: 700; margin-bottom: 8px; color: var(--text); }
.technique-steps { counter-reset: step; }
.technique-step {
  display: flex; gap: 10px;
  font-size: 13px; color: var(--text-2); margin-bottom: 8px;
}
.technique-step::before {
  counter-increment: step;
  content: counter(step);
  min-width: 22px; height: 22px;
  background: var(--accent-dim); color: var(--accent);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 700; flex-shrink: 0;
}

.lesson-nav { display: flex; justify-content: space-between; margin-top: 28px; gap: 12px; }

/* --- Flashcards (SR) --- */
.sr-hub { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 14px; margin-bottom: 24px; }
.sr-stat-card {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}
.sr-stat-num { font-size: 36px; font-weight: 800; margin-bottom: 4px; }
.sr-stat-label { font-size: 12px; color: var(--text-2); }
.sr-stat-new .sr-stat-num { color: var(--blue); }
.sr-stat-review .sr-stat-num { color: var(--accent); }
.sr-stat-done .sr-stat-num { color: var(--green); }

.flashcard-area { max-width: 640px; margin: 0 auto; }
.flashcard-wrapper { perspective: 1000px; margin-bottom: 20px; }
.flashcard {
  width: 100%;
  min-height: 260px;
  position: relative;
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform 0.5s ease;
}
.flashcard.flipped { transform: rotateY(180deg); }
.flashcard-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}
.flashcard-back { transform: rotateY(180deg); }
.flashcard-face-label { font-size: 11px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-3); margin-bottom: 16px; }
.flashcard-question { font-size: 18px; font-weight: 600; line-height: 1.5; }
.flashcard-answer { font-size: 15px; color: var(--text-2); line-height: 1.7; }
.flashcard-hint { font-size: 12px; color: var(--text-3); margin-top: 12px; font-style: italic; }
.flashcard-tap-hint { font-size: 12px; color: var(--text-3); margin-top: 16px; }
.flashcard-topic-tag {
  position: absolute;
  top: 12px; right: 12px;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 10px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 10px;
}

.sr-rating-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}
.sr-rating-btn {
  padding: 14px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  background: var(--card);
  color: var(--text);
  font-size: 13px;
  font-weight: 600;
  transition: all var(--transition);
  display: flex; flex-direction: column; align-items: center; gap: 4px;
}
.sr-rating-btn .rating-label { font-size: 11px; color: var(--text-2); font-weight: 400; }
.sr-rating-btn:hover { transform: translateY(-2px); }
.sr-rate-0 { border-color: var(--red-dim); } .sr-rate-0:hover { background: var(--red-dim); }
.sr-rate-1 { border-color: var(--yellow-dim); } .sr-rate-1:hover { background: var(--yellow-dim); }
.sr-rate-2 { border-color: var(--blue-dim); } .sr-rate-2:hover { background: var(--blue-dim); }
.sr-rate-3 { border-color: var(--green-dim); } .sr-rate-3:hover { background: var(--green-dim); }

.sr-progress-row { display: flex; align-items: center; gap: 12px; font-size: 12px; color: var(--text-2); }
.sr-progress-bar-wrap { flex: 1; }

/* --- Quiz --- */
.quiz-topic-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; }
.quiz-topic-card {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: all var(--transition);
}
.quiz-topic-card:hover { border-color: var(--accent-dim); transform: translateY(-2px); }
.qtc-emoji { font-size: 28px; margin-bottom: 12px; }
.qtc-name { font-size: 14px; font-weight: 700; margin-bottom: 6px; }
.qtc-stats { display: flex; gap: 10px; font-size: 11px; color: var(--text-2); }
.qtc-best { font-size: 12px; color: var(--green); font-weight: 600; margin-top: 8px; }

.quiz-active-wrap { max-width: 700px; margin: 0 auto; padding: 28px 32px; }
.quiz-top-bar { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; }
.quiz-progress-wrap { flex: 1; }
.quiz-timer {
  font-size: 20px; font-weight: 800; color: var(--accent);
  min-width: 50px; text-align: right;
}
.quiz-timer.warning { color: var(--red); animation: pulse 0.5s infinite; }
.question-card {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 20px;
}
.question-num { font-size: 11px; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 8px; }
.question-text { font-size: 17px; font-weight: 600; line-height: 1.6; margin-bottom: 24px; }
.question-options { display: flex; flex-direction: column; gap: 10px; }
.option-btn {
  background: var(--surface);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  color: var(--text);
  font-size: 14px;
  text-align: left;
  transition: all var(--transition);
  display: flex; gap: 12px; align-items: flex-start;
}
.option-btn:hover { border-color: var(--accent-dim); background: var(--accent-dim); }
.option-btn.selected { border-color: var(--accent); background: var(--accent-dim); }
.option-btn.correct { border-color: var(--green); background: var(--green-dim); }
.option-btn.wrong { border-color: var(--red); background: var(--red-dim); }
.option-letter { width: 24px; height: 24px; border: 2px solid currentColor; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 12px; flex-shrink: 0; }
.explanation-box {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 16px;
  font-size: 13px;
  color: var(--text-2);
  margin-top: 14px;
}
.explanation-box .ex-title { font-weight: 700; color: var(--text); margin-bottom: 6px; }

.quiz-result {
  max-width: 540px;
  margin: 0 auto;
  text-align: center;
  padding: 40px 20px;
}
.quiz-score-circle {
  width: 140px; height: 140px;
  border-radius: 50%;
  border: 6px solid;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  margin: 0 auto 24px;
}
.quiz-score-num { font-size: 36px; font-weight: 800; }
.quiz-score-label { font-size: 12px; color: var(--text-2); }

/* --- Challenges --- */
.challenge-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.challenge-card {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 20px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.challenge-card:hover { border-color: var(--accent-dim); }
.challenge-card.completed { opacity: 0.7; }
.challenge-card.completed::after {
  content: '✓ DONE';
  position: absolute;
  top: 12px; right: 12px;
  background: var(--green);
  color: white;
  font-size: 10px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 10px;
}
.challenge-header { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 12px; }
.challenge-emoji { font-size: 28px; }
.challenge-name { font-size: 15px; font-weight: 700; }
.challenge-topic { font-size: 11px; color: var(--text-2); margin-top: 2px; }
.challenge-desc { font-size: 13px; color: var(--text-2); margin-bottom: 14px; line-height: 1.6; }
.challenge-footer { display: flex; align-items: center; justify-content: space-between; }
.challenge-xp { color: var(--yellow); font-size: 13px; font-weight: 700; }
.challenge-difficulty { font-size: 11px; padding: 2px 8px; border-radius: 10px; }

/* --- Projects --- */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 16px; }
.project-card {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 22px;
  cursor: pointer;
  transition: all var(--transition);
}
.project-card:hover { border-color: var(--accent-dim); transform: translateY(-2px); box-shadow: var(--shadow); }
.project-header { display: flex; gap: 14px; align-items: flex-start; margin-bottom: 14px; }
.project-icon { font-size: 32px; }
.project-title { font-size: 16px; font-weight: 700; }
.project-subtitle { font-size: 12px; color: var(--text-2); margin-top: 2px; }
.project-desc { font-size: 13px; color: var(--text-2); margin-bottom: 14px; line-height: 1.6; }
.project-meta { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.project-meta-item { font-size: 11px; color: var(--text-2); display: flex; align-items: center; gap: 4px; }
.project-deliverables { font-size: 12px; color: var(--text-2); }
.project-deliverables strong { color: var(--text); display: block; margin-bottom: 6px; }
.project-deliverable { display: flex; align-items: center; gap: 6px; margin-bottom: 4px; }

/* --- Planner --- */
.planner-grid { display: grid; grid-template-columns: 300px 1fr; gap: 20px; }
.planner-sidebar { display: flex; flex-direction: column; gap: 14px; }
.week-selector { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.week-selector button { background: none; border: 1px solid var(--border-light); border-radius: var(--radius-sm); padding: 6px 14px; color: var(--text-2); }
.week-selector button:hover { background: var(--card-hover); }
.planner-calendar { display: grid; grid-template-columns: repeat(7, 1fr); gap: 6px; }
.planner-day { background: var(--surface); border-radius: var(--radius-sm); padding: 8px; text-align: center; cursor: pointer; transition: all var(--transition); }
.planner-day.today { border: 1px solid var(--accent); }
.planner-day.has-session { background: var(--accent-dim); }
.planner-day-name { font-size: 10px; color: var(--text-3); }
.planner-day-num { font-size: 16px; font-weight: 700; }
.planner-day-dot { width: 5px; height: 5px; border-radius: 50%; background: var(--accent); margin: 3px auto 0; }

.schedule-timeline { display: flex; flex-direction: column; gap: 8px; }
.schedule-block {
  display: flex; gap: 14px; align-items: flex-start;
  padding: 14px 16px;
  background: var(--card);
  border-left: 3px solid;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.schedule-time { font-size: 12px; color: var(--text-2); min-width: 80px; font-weight: 600; }
.schedule-info { flex: 1; }
.schedule-title { font-size: 14px; font-weight: 600; }
.schedule-meta { font-size: 11px; color: var(--text-2); }

/* --- CGPA --- */
.cgpa-overview { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; margin-bottom: 24px; }
.cgpa-stat { background: var(--card); border: 1px solid var(--border-light); border-radius: var(--radius); padding: 20px; text-align: center; }
.cgpa-stat-val { font-size: 36px; font-weight: 800; background: linear-gradient(135deg, var(--accent), var(--purple)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.cgpa-stat-label { font-size: 12px; color: var(--text-2); }
.courses-table { background: var(--card); border: 1px solid var(--border-light); border-radius: var(--radius); overflow: hidden; }
.courses-table table { width: 100%; border-collapse: collapse; }
.courses-table th { background: var(--surface); padding: 12px 16px; text-align: left; font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-2); }
.courses-table td { padding: 12px 16px; border-top: 1px solid var(--border-light); font-size: 13px; }
.courses-table tr:hover td { background: var(--card-hover); }
.grade-select { background: var(--surface); border: 1px solid var(--border-light); border-radius: 4px; padding: 4px 8px; color: var(--text); font-size: 12px; }

/* --- Knowledge Graph --- */
#graph-container {
  position: relative;
  height: calc(100vh - 160px);
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border-light);
}
#knowledge-canvas { width: 100%; height: 100%; }
.graph-tooltip {
  position: absolute;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 13px;
  pointer-events: none;
  max-width: 220px;
  box-shadow: var(--shadow);
}
.graph-tooltip .gt-name { font-weight: 700; margin-bottom: 4px; }
.graph-tooltip .gt-desc { font-size: 12px; color: var(--text-2); }
.graph-info-panel {
  position: absolute;
  right: 0; top: 0; bottom: 0;
  width: 300px;
  background: var(--card);
  border-left: 1px solid var(--border-light);
  padding: 20px;
  overflow-y: auto;
}

/* --- Analytics --- */
.analytics-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; margin-bottom: 24px; }
.chart-card { background: var(--card); border: 1px solid var(--border-light); border-radius: var(--radius); padding: 20px; }
.chart-card h3 { font-size: 14px; font-weight: 600; margin-bottom: 14px; }
.bar-chart { display: flex; gap: 8px; align-items: flex-end; height: 120px; }
.bar-item { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 4px; }
.bar-fill { width: 100%; background: var(--accent); border-radius: 4px 4px 0 0; transition: height 0.5s ease; }
.bar-label { font-size: 10px; color: var(--text-3); }
.bar-val { font-size: 10px; color: var(--text-2); }

.heatmap { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; }
.heatmap-cell { aspect-ratio: 1; border-radius: 2px; background: var(--surface); }
.heatmap-cell.l1 { background: rgba(99,102,241,0.25); }
.heatmap-cell.l2 { background: rgba(99,102,241,0.5); }
.heatmap-cell.l3 { background: rgba(99,102,241,0.75); }
.heatmap-cell.l4 { background: var(--accent); }

.analytics-row { display: grid; grid-template-columns: 2fr 1fr; gap: 16px; margin-bottom: 16px; }
.insight-card {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 20px;
}
.insight-item {
  display: flex; gap: 12px; align-items: flex-start;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-light);
}
.insight-item:last-child { border-bottom: none; }
.insight-icon { font-size: 20px; flex-shrink: 0; }
.insight-text { font-size: 13px; color: var(--text-2); }
.insight-text strong { color: var(--text); }

/* --- Achievements --- */
.achievement-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
.achievement-card {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 18px;
  transition: all var(--transition);
  position: relative;
}
.achievement-card.unlocked { border-color: var(--yellow-dim); }
.achievement-card.locked { opacity: 0.5; filter: grayscale(0.5); }
.achievement-card:hover { transform: translateY(-2px); }
.ach-rarity {
  position: absolute; top: 12px; right: 12px;
  font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em;
  padding: 2px 7px; border-radius: 10px;
}
.ach-rarity.common { background: var(--border-light); color: var(--text-2); }
.ach-rarity.rare { background: var(--blue-dim); color: var(--blue); }
.ach-rarity.epic { background: var(--purple-dim); color: var(--purple); }
.ach-rarity.legendary { background: var(--yellow-dim); color: var(--yellow); }
.ach-emoji { font-size: 36px; margin-bottom: 12px; }
.ach-name { font-size: 14px; font-weight: 700; margin-bottom: 4px; }
.ach-desc { font-size: 12px; color: var(--text-2); margin-bottom: 10px; }
.ach-progress { }
.ach-xp { color: var(--yellow); font-size: 12px; font-weight: 700; }
.ach-date { font-size: 11px; color: var(--green); margin-top: 4px; }

/* --- Settings --- */
.settings-section { background: var(--card); border: 1px solid var(--border-light); border-radius: var(--radius); padding: 24px; margin-bottom: 16px; }
.settings-section h3 { font-size: 15px; font-weight: 700; margin-bottom: 18px; }
.setting-row { display: flex; align-items: center; justify-content: space-between; padding: 12px 0; border-bottom: 1px solid var(--border-light); }
.setting-row:last-child { border-bottom: none; }
.setting-info { flex: 1; }
.setting-label { font-size: 14px; font-weight: 500; }
.setting-desc { font-size: 12px; color: var(--text-2); margin-top: 2px; }
.toggle {
  width: 44px; height: 24px;
  background: var(--surface);
  border-radius: 12px;
  position: relative;
  cursor: pointer;
  transition: background var(--transition);
  border: 1px solid var(--border-light);
  flex-shrink: 0;
}
.toggle.on { background: var(--accent); border-color: var(--accent); }
.toggle::after {
  content: '';
  width: 18px; height: 18px;
  background: white;
  border-radius: 50%;
  position: absolute;
  top: 2px; left: 2px;
  transition: transform var(--transition);
}
.toggle.on::after { transform: translateX(20px); }

/* --- Modal --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  max-width: 560px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  position: relative;
}
.modal-close {
  position: absolute; top: 14px; right: 14px;
  background: none; border: none;
  color: var(--text-2); font-size: 18px;
  width: 30px; height: 30px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition);
}
.modal-close:hover { background: var(--surface); color: var(--text); }
.modal-title { font-size: 20px; font-weight: 700; margin-bottom: 6px; }
.modal-subtitle { font-size: 13px; color: var(--text-2); margin-bottom: 20px; }

/* --- Toast --- */
.toast-container {
  position: fixed;
  bottom: 24px; right: 24px;
  z-index: 1000;
  display: flex; flex-direction: column; gap: 10px;
}
.toast {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  display: flex; align-items: center; gap: 10px;
  min-width: 280px;
  box-shadow: var(--shadow);
  animation: slideIn 0.3s ease;
  font-size: 13px;
}
.toast.success { border-left: 3px solid var(--green); }
.toast.info { border-left: 3px solid var(--accent); }
.toast.warning { border-left: 3px solid var(--yellow); }
.toast.error { border-left: 3px solid var(--red); }
.toast-icon { font-size: 18px; }
.toast-text { flex: 1; }
.toast-title { font-weight: 600; }
.toast-msg { color: var(--text-2); font-size: 12px; }

/* --- Animations --- */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
@keyframes levelUp {
  0% { transform: scale(0.5); opacity: 0; }
  60% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(1); }
}

.fade-in { animation: fadeIn 0.3s ease; }

/* --- Scrollbars --- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-3); }

/* --- Responsive --- */
@media (max-width: 1100px) {
  .section-row { grid-template-columns: 1fr; }
  .section-col-narrow { flex-direction: row; flex-wrap: wrap; }
  .section-col-narrow .card { flex: 1; min-width: 240px; }
}
@media (max-width: 768px) {
  .sidebar { width: var(--sidebar-collapsed); }
  .sidebar .nav-label, .sidebar .logo-text, .sidebar .user-info,
  .sidebar .sidebar-xp, .sidebar .sidebar-streak, .sidebar .nav-section-label { display: none; }
  .main { margin-left: var(--sidebar-collapsed); }
  .view { padding: 20px 16px; }
  .view-header { flex-direction: column; }
  .roadmap-grid { grid-template-columns: 1fr; }
  .sr-hub { grid-template-columns: 1fr 1fr 1fr; }
  .sr-rating-row { grid-template-columns: 1fr 1fr; }
  .planner-grid { grid-template-columns: 1fr; }
  .analytics-row { grid-template-columns: 1fr; }
}

/* --- Utility Classes --- */
.text-center { text-align: center; }
.text-muted { color: var(--text-2); }
.font-bold { font-weight: 700; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.mb-2 { margin-bottom: 8px; }
.mb-3 { margin-bottom: 16px; }
.p-3 { padding: 14px; }
.empty-state { text-align: center; padding: 48px 20px; color: var(--text-2); }
.empty-state-icon { font-size: 48px; margin-bottom: 14px; }
.empty-state-title { font-size: 18px; font-weight: 600; color: var(--text); margin-bottom: 8px; }

/* Achievement Summary */
.achievement-stats { display: flex; gap: 14px; }
.ach-sum-item { text-align: center; }
.ach-sum-num { font-size: 20px; font-weight: 800; color: var(--yellow); }
.ach-sum-label { font-size: 11px; color: var(--text-2); }

/* Mastery Badge */
.mastery-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: linear-gradient(135deg, rgba(99,102,241,0.2), rgba(168,85,247,0.2));
  border: 1px solid rgba(99,102,241,0.3);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px; font-weight: 700;
}

/* Section title */
.section-title {
  font-size: 18px; font-weight: 700;
  margin-bottom: 16px;
  display: flex; align-items: center; gap: 10px;
}
.section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-light);
}