/* ==========================================================
   SANKALP — Sololearn-Inspired Premium Design System
   Bright White & Slate Palette • Royal Electric Blue + Emerald Accents
   Modern Plus Jakarta Sans Type System
   ========================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;700&display=swap');

* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  /* Sololearn modern palette */
  --paper: #FFFFFF;          /* Main background color - crisp white */
  --paper-soft: #FFFFFF;     /* Card background color - crisp white */
  --paper-deep: #F8FAFC;     /* Secondary soft background - slate-50 */
  --ink: #0F172A;            /* Deep dark slate text - slate-900 */
  --ink-soft: #334155;       /* Primary body text color - slate-700 */
  --ink-mute: #64748B;       /* Muted text color - slate-500 */
  --rust: #0A74F5;           /* Primary electric blue accent */
  --rust-deep: #0059E3;      /* Slightly darker electric blue for hover states */
  --forest: #10B981;         /* Mint green accent for success badges and states */
  --forest-deep: #059669;    /* Darker mint green for success hover states */
  --rule: rgba(15,23,42,0.08); /* Clean, faint border line - slate-900 at 8% opacity */
  --rule-strong: rgba(15,23,42,0.15); /* Slightly stronger border line - slate-900 at 15% opacity */

  /* Aliases for back-compat with existing markup */
  --primary: var(--rust);
  --primary-dark: var(--rust-deep);
  --secondary: var(--forest);
  --accent: var(--rust);
  --success: var(--forest);
  --danger: #EF4444;
  --dark: var(--ink);
  --darker: #0F172A;
  --light: var(--paper-deep);
  --card: var(--paper-soft);
  --border: var(--rule);
  --text: var(--ink);
  --muted: var(--ink-mute);

  --font-display: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
  font-feature-settings: "ss01", "ss02";
  -webkit-font-smoothing: antialiased;
}

/* Subtle paper texture - disabled for ultra-clean UI */
body::before {
  display: none !important;
}

::selection { background: var(--rust); color: #FFFFFF; }

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--paper-deep); }
::-webkit-scrollbar-thumb { background: #CBD5E1; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--rust); }

/* ==========================================================
   TYPOGRAPHY
   ========================================================== */

.display-hero {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.8rem, 8vw, 6.5rem);
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.display-xl {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  line-height: 1;
  letter-spacing: -0.02em;
}

.display-lg {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1.05;
  letter-spacing: -0.015em;
}

.display-md {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  line-height: 1.15;
}

.italic-accent {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 700;
  color: var(--forest);
}

.rust-accent { color: var(--rust); }
.forest-accent { color: var(--forest); }
.ink-accent { color: var(--ink); }

.section-label {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--rust);
}

.section-label.muted { color: var(--ink-mute); }

.lede {
  font-family: var(--font-sans);
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 60ch;
}

.eyebrow {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.25em;
  color: var(--ink-mute);
}

/* Gradient-text legacy classes — flatten to ink for editorial */
.gradient-text, .gradient-text-gold, .gold-text, .purple-text {
  background: none !important;
  -webkit-text-fill-color: var(--ink) !important;
  color: var(--ink);
}

.gold-text { color: var(--rust); -webkit-text-fill-color: var(--rust) !important; }
.purple-text { color: var(--forest); font-style: italic; font-family: var(--font-display); -webkit-text-fill-color: var(--forest) !important; }

/* ==========================================================
   MASTHEAD (top bulletin bar)
   ========================================================== */

.masthead {
  background: var(--paper);
  border-bottom: 1px solid var(--ink);
  padding: 8px 0;
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-soft);
  overflow: hidden;
}

.masthead-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.masthead span { white-space: nowrap; }

/* ==========================================================
   NAVBAR
   ========================================================== */

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--paper);
  border-bottom: 1px solid var(--ink);
  transition: box-shadow 0.2s ease;
  padding: 14px 0;
}

.navbar.scrolled {
  background: var(--paper);
  backdrop-filter: none;
  box-shadow: 0 1px 0 var(--ink);
}

.navbar-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
}

.brand-mark {
  width: 38px; height: 38px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  flex-shrink: 0;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 14px;
  line-height: 1;
  letter-spacing: -0.01em;
}

.brand-sub {
  font-family: var(--font-sans);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-top: 3px;
}

.nav-links {
  display: flex;
  gap: 28px;
  align-items: center;
}

.nav-link {
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  text-decoration: none;
  transition: color 0.15s;
}

.nav-link:hover { color: var(--rust); }
.nav-link.active { color: var(--rust); }

/* ==========================================================
   BUTTONS
   ========================================================== */

.btn-primary, .btn-rust {
  background: var(--rust);
  color: #FFFFFF;
  padding: 12px 24px;
  border-radius: 8px;
  border: 1px solid var(--rust);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.02em;
  text-transform: none;
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  line-height: 1;
}

.btn-primary:hover, .btn-rust:hover {
  background: var(--rust-deep);
  border-color: var(--rust-deep);
  transform: translateY(-1.5px);
  box-shadow: 0 4px 12px rgba(10, 116, 245, 0.2);
}

.btn-ink {
  background: var(--ink);
  color: #FFFFFF;
  padding: 12px 24px;
  border-radius: 8px;
  border: 1px solid var(--ink);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.02em;
  text-transform: none;
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  line-height: 1;
}

.btn-ink:hover {
  background: #1E293B;
  border-color: #1E293B;
  transform: translateY(-1.5px);
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.15);
}

.btn-secondary, .btn-ghost {
  background: transparent;
  color: var(--ink);
  padding: 12px 24px;
  border-radius: 8px;
  border: 1px solid #CBD5E1;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.02em;
  text-transform: none;
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  line-height: 1;
}

.btn-secondary:hover, .btn-ghost:hover {
  background: #F1F5F9;
  border-color: #94A3B8;
  color: var(--ink);
  transform: translateY(-1px);
}

.btn-gold {
  background: var(--forest);
  color: #FFFFFF;
  padding: 12px 24px;
  border-radius: 8px;
  border: 1px solid var(--forest);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.02em;
  text-transform: none;
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  line-height: 1;
}

.btn-gold:hover {
  background: var(--forest-deep);
  border-color: var(--forest-deep);
  transform: translateY(-1.5px);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.2);
}

.btn-sm { padding: 8px 16px; font-size: 12px; }
.btn-lg { padding: 16px 32px; font-size: 15px; }

/* ==========================================================
   CARDS / CHAPTERS / FEATURES
   ========================================================== */

.chapter-card,
.feature-card,
.course-card {
  background: var(--paper-soft);
  border: 1px solid var(--rule);
  border-radius: 12px;
  padding: 28px;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 6px -1px rgba(15,23,42,0.02), 0 2px 4px -2px rgba(15,23,42,0.02);
}

.chapter-card:hover,
.feature-card:hover,
.course-card:hover {
  background: var(--paper-soft);
  color: var(--ink);
  transform: translateY(-4px);
  border-color: var(--rust);
  box-shadow: 0 12px 24px -10px rgba(10, 116, 245, 0.15), 0 4px 16px rgba(15, 23, 42, 0.04);
}

.chapter-card:hover .section-label,
.feature-card:hover .section-label,
.course-card:hover .section-label { color: var(--rust); }

.chapter-card:hover .italic-accent,
.feature-card:hover .italic-accent { color: var(--forest); }

.chapter-num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 3.5rem;
  line-height: 1;
  color: var(--rust);
  display: block;
  margin-bottom: 8px;
}

.feature-card::before { display: none; }

.course-thumb {
  height: 160px;
  background: #0F172A;
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 800;
  position: relative;
  border-bottom: 1px solid rgba(15,23,42,0.06);
}

/* ==========================================================
   STATS
   ========================================================== */

.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.stat-row .stat-card,
.stat-row > .stat {
  padding: 32px 24px;
  text-align: left;
  border-right: 1px solid var(--rule-strong);
}

.stat-row > *:last-child { border-right: none; }

.stat-card { padding: 24px; text-align: left; }

.stat-number {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.4rem, 5vw, 4rem);
  line-height: 1;
  color: var(--ink);
  background: none !important;
  -webkit-text-fill-color: var(--ink) !important;
  letter-spacing: -0.02em;
  display: block;
  margin-bottom: 8px;
}

.stat-label {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--ink-mute);
}

/* ==========================================================
   MARQUEE TICKER
   ========================================================== */

.marquee {
  background: var(--rust);
  color: var(--paper);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  overflow: hidden;
  padding: 18px 0;
}

.marquee-track {
  display: flex;
  gap: 48px;
  animation: marquee-scroll 30s linear infinite;
  white-space: nowrap;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.5rem;
  letter-spacing: -0.01em;
}

.marquee-track span { display: inline-flex; align-items: center; gap: 48px; }
.marquee-track span::after {
  content: '+';
  margin-left: 48px;
  color: var(--paper);
  opacity: 0.7;
}

@keyframes marquee-scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ==========================================================
   FORMS / INPUTS
   ========================================================== */

.input-field {
  background: #FFFFFF;
  border: 1px solid #DDE3EA;
  border-radius: 8px;
  padding: 12px 16px;
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  width: 100%;
  transition: all 0.15s ease;
  outline: none;
}

.input-field:focus {
  background: #FFFFFF;
  border-color: var(--rust);
  box-shadow: 0 0 0 4px rgba(10, 116, 245, 0.1);
}

.input-field::placeholder { color: var(--ink-mute); font-weight: 400; }

.input-label {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 8px;
  display: block;
}

textarea.input-field { min-height: 120px; resize: vertical; font-family: var(--font-sans); }

select.input-field {
  appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'><path fill='%2364748B' d='M6 8L0 0h12z'/></svg>");
  background-repeat: no-repeat;
  background-position: right 18px center;
  padding-right: 44px;
}

/* ==========================================================
   SIDEBAR (dashboards)
   ========================================================== */

.sidebar {
  width: 260px;
  min-height: 100vh;
  background: #0F172A; /* Premium dark slate background */
  border-right: 1px solid rgba(255,255,255,0.06);
  position: fixed;
  left: 0;
  top: 0;
  z-index: 50;
  transition: transform 0.25s ease;
  padding: 0;
  overflow-y: auto;
}

.sidebar-head {
  padding: 24px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  display: flex;
  align-items: center;
  gap: 12px;
}

.sidebar-head .brand-name,
.sidebar-head .brand {
  color: #FFFFFF;
}

.sidebar-head .brand-sub {
  color: #94A3B8;
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.sidebar-head .brand-mark {
  background: var(--rust);
  color: #FFFFFF;
  font-weight: 800;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 18px;
  color: #94A3B8; /* Sleek, muted slate text */
  text-decoration: none;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: none; /* Modern sentence/capitalized case */
  transition: all 0.15s ease;
  margin: 4px 14px; /* Floating pill effect */
  border-radius: 8px;
  border-left: none;
}

.sidebar-link:hover {
  background: rgba(255,255,255,0.05);
  color: #FFFFFF;
}

.sidebar-link.active {
  background: var(--rust); /* Electric blue active state */
  color: #FFFFFF;
  border-left: none;
}

.sidebar-link i { font-size: 14px; width: 18px; text-align: center; }

.main-content {
  margin-left: 260px;
  min-height: 100vh;
  background: var(--paper-deep); /* Secondary slate-50 background for main page content contrast */
  padding: 40px;
}

/* Back-compat overrides for .sidebar-ink (just inherit premium dark style) */
.sidebar-ink {
  background: #0B0F19; /* Slightly darker midnight slate for admin back-office */
}
.sidebar-ink .sidebar-link.active {
  background: var(--rust);
}

/* ==========================================================
   QUIZ / MODULE
   ========================================================== */

.quiz-option {
  background: #FFFFFF;
  border: 1px solid #E2E8F0;
  border-radius: 12px;
  padding: 16px 20px;
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--ink);
  box-shadow: 0 2px 4px rgba(0,0,0,0.01);
}

.quiz-option:hover {
  background: #F8FAFC;
  color: var(--ink);
  transform: translateY(-2px);
  border-color: var(--rust);
  box-shadow: 0 6px 12px rgba(10,116,245,0.06);
}

.quiz-option.correct {
  background: #ECFDF5 !important;
  color: #065F46 !important;
  border-color: var(--forest) !important;
}

.quiz-option.wrong {
  background: #FEF2F2 !important;
  color: #991B1B !important;
  border-color: #EF4444 !important;
}

.module-step {
  border-left: 3px solid var(--rule);
  padding-left: 20px;
  margin-bottom: 24px;
  transition: border-color 0.2s;
}
.module-step.active { border-left-color: var(--rust); }

.concept-box {
  background: #F0FDF4; /* Sleek, soft mint green tint */
  border: 1px solid #DCFCE7;
  border-left: 4px solid var(--forest);
  border-radius: 8px;
  padding: 24px;
  margin: 20px 0;
  color: #14532D;
}

.formula-box {
  background: #0F172A;
  color: #FFFFFF;
  border: 1px solid #1E293B;
  border-radius: 8px;
  padding: 18px 24px;
  font-family: var(--font-mono);
  font-size: 1.05em;
  text-align: center;
  margin: 16px 0;
  letter-spacing: 0.02em;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

/* ==========================================================
   BADGES
   ========================================================== */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  border: 1px solid currentColor;
}

.badge-primary { background: transparent; color: var(--rust); }
.badge-success { background: transparent; color: var(--forest); }
.badge-warning { background: var(--rust); color: var(--paper); border-color: var(--rust); }
.badge-danger { background: var(--rust); color: var(--paper); border-color: var(--rust); }
.badge-ink { background: var(--ink); color: var(--paper); border-color: var(--ink); }

.req-tag {
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-mute);
  padding: 4px 10px;
  border: 1px solid var(--ink);
  border-radius: 0;
  display: inline-block;
}

/* ==========================================================
   PROGRESS BAR
   ========================================================== */

.progress-bar {
  height: 4px;
  background: var(--paper-deep);
  border: 1px solid var(--ink);
  border-radius: 0;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--rust);
  border-radius: 0;
  transition: width 0.6s ease;
}

/* ==========================================================
   TABLES (editorial)
   ========================================================== */

.data-table,
.editorial-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-family: var(--font-sans);
  background: #FFFFFF;
  border: 1px solid #E2E8F0;
  border-radius: 12px;
  overflow: hidden;
}

.data-table th,
.editorial-table th {
  padding: 16px;
  text-align: left;
  font-size: 11px;
  font-weight: 700;
  color: var(--ink-mute);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid #E2E8F0;
  border-top: none;
  background: #F8FAFC;
}

.data-table td,
.editorial-table td {
  padding: 16px;
  border-bottom: 1px solid #F1F5F9;
  font-size: 14px;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
}

.data-table tr:last-child td,
.editorial-table tr:last-child td {
  border-bottom: none;
}

.data-table tr:hover td,
.editorial-table tr:hover td { background: #F8FAFC; }

.editorial-table td .italic-accent { font-size: 13px; }

/* ==========================================================
   ACCORDION
   ========================================================== */

.accordion-item {
  border: 1px solid var(--ink);
  border-radius: 0;
  overflow: hidden;
  margin-bottom: 0;
  border-bottom: none;
  background: var(--paper);
}

.accordion-item:last-child { border-bottom: 1px solid var(--ink); }

.accordion-header {
  padding: 18px 22px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--paper);
  transition: background 0.15s;
  font-family: var(--font-sans);
  font-weight: 700;
  color: var(--ink);
}
.accordion-header:hover { background: var(--paper-soft); }
.accordion-content {
  padding: 0 22px;
  max-height: 0;
  overflow: hidden;
  transition: all 0.3s ease;
  background: var(--paper-soft);
  border-top: 1px solid transparent;
  font-family: var(--font-sans);
  color: var(--ink-soft);
  line-height: 1.6;
}
.accordion-content.open { max-height: 1000px; padding: 18px 22px; border-top-color: var(--ink); }

/* ==========================================================
   GLASS LEGACY — flatten
   ========================================================== */

.glass, .glass-card {
  background: var(--paper-soft);
  backdrop-filter: none;
  border: 1px solid var(--ink);
  border-radius: 0;
}

.glass-card:hover {
  background: var(--ink);
  color: var(--paper);
  transform: none;
  box-shadow: 6px 6px 0 var(--ink);
}

.bg-hero,
.bg-gradient-primary,
.bg-gradient-secondary {
  background: var(--paper) !important;
}

.gradient-border { border: 1px solid var(--ink); border-radius: 0; }
.gradient-border::before { display: none; }

/* ==========================================================
   ANIMATIONS — keep names but tone down
   ========================================================== */

@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-6px); } }
@keyframes floatSlow { 0%,100% { transform: translateY(0) rotate(0); } 50% { transform: translateY(-4px) rotate(1deg); } }
.float { animation: float 5s ease-in-out infinite; }
.float-slow { animation: floatSlow 7s ease-in-out infinite; }
.float-delay { animation: float 5s ease-in-out 1s infinite; }

@keyframes pulse-glow { 0%,100% { box-shadow: 4px 4px 0 var(--ink); } 50% { box-shadow: 6px 6px 0 var(--rust); } }
.pulse-glow { animation: pulse-glow 2s ease-in-out infinite; }

@keyframes fadeInUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInLeft { from { opacity: 0; transform: translateX(-20px); } to { opacity: 1; transform: translateX(0); } }
@keyframes fadeInRight { from { opacity: 0; transform: translateX(20px); } to { opacity: 1; transform: translateX(0); } }

.fade-in-up { animation: fadeInUp 0.5s ease forwards; }
.fade-in-left { animation: fadeInLeft 0.5s ease forwards; }
.fade-in-right { animation: fadeInRight 0.5s ease forwards; }

.delay-1 { animation-delay: 0.08s; opacity: 0; }
.delay-2 { animation-delay: 0.16s; opacity: 0; }
.delay-3 { animation-delay: 0.24s; opacity: 0; }
.delay-4 { animation-delay: 0.32s; opacity: 0; }
.delay-5 { animation-delay: 0.40s; opacity: 0; }

/* ==========================================================
   NOTIFICATIONS
   ========================================================== */

.notification {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 9999;
  padding: 14px 22px;
  border: 1px solid var(--ink);
  border-radius: 0;
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 13px;
  animation: slideInRight 0.25s ease;
  max-width: 380px;
  box-shadow: 4px 4px 0 var(--ink);
}

.notification.success { background: var(--forest); color: var(--paper); border-color: var(--forest); }
.notification.error { background: var(--rust); color: var(--paper); border-color: var(--rust); }
.notification.info { background: var(--ink); color: var(--paper); }

@keyframes slideInRight {
  from { transform: translate(20px, -10px); opacity: 0; }
  to { transform: translate(0,0); opacity: 1; }
}

/* ==========================================================
   LOADING SPINNER
   ========================================================== */

.loading-spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--rule);
  border-top-color: var(--rust);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ==========================================================
   FOOTER
   ========================================================== */

.footer-ink {
  background: var(--ink);
  color: var(--paper);
  padding: 80px 0 24px;
  border-top: 1px solid var(--ink);
}

.footer-ink .footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 48px;
}

.footer-ink h4 {
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--rust);
  margin-bottom: 18px;
}

.footer-ink a {
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  display: block;
  padding: 4px 0;
  opacity: 0.85;
  transition: opacity 0.15s, color 0.15s;
}

.footer-ink a:hover { color: var(--rust); opacity: 1; }

.footer-ink p { font-family: var(--font-sans); font-size: 14px; line-height: 1.6; opacity: 0.7; }

.footer-bottom {
  max-width: 1280px;
  margin: 64px auto 0;
  padding: 24px;
  border-top: 1px solid rgba(234,219,192,0.15);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-sans);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  opacity: 0.6;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-stamp {
  background: var(--rust);
  color: var(--paper);
  padding: 8px 16px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  opacity: 1;
}

/* ==========================================================
   UTILITY HELPERS
   ========================================================== */

.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 880px; margin: 0 auto; padding: 0 24px; }

.section { padding: 96px 0; }
.section-tight { padding: 48px 0; }

.divider-ink { height: 1px; background: var(--ink); border: 0; margin: 24px 0; }
.divider-rule { height: 1px; background: var(--rule); border: 0; margin: 16px 0; }

.text-center { text-align: center; }
.text-rust { color: var(--rust); }
.text-forest { color: var(--forest); }
.text-ink { color: var(--ink); }
.text-mute { color: var(--ink-mute); }

.bg-paper { background: var(--paper); }
.bg-paper-soft { background: var(--paper-soft); }
.bg-ink { background: var(--ink); color: var(--paper); }
.bg-rust { background: var(--rust); color: var(--paper); }
.bg-forest { background: var(--forest); color: var(--paper); }

.border-ink { border: 1px solid var(--ink); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; } .gap-3 { gap: 12px; } .gap-4 { gap: 16px; } .gap-6 { gap: 24px; } .gap-8 { gap: 32px; }

.grid { display: grid; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ==========================================================
   MOBILE
   ========================================================== */

.menu-toggle {
  display: none;
  position: fixed;
  top: 14px;
  left: 16px;
  z-index: 99999 !important;
  background: var(--ink);
  border: 1px solid var(--ink);
  border-radius: 4px;
  padding: 8px 12px;
  cursor: pointer;
  color: var(--paper);
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.navbar .menu-toggle {
  position: relative !important;
  top: auto !important;
  left: auto !important;
  z-index: 10;
  background: transparent !important;
  color: var(--ink) !important;
  border: none !important;
  padding: 6px !important;
  font-size: 20px !important;
  margin: 0 !important;
  display: none;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(26,20,16,0.4);
  z-index: 40;
}
.sidebar-overlay.open { display: block; }

@media (max-width: 1024px) {
  .footer-ink .footer-inner { grid-template-columns: 1fr 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .hide-mobile { display: none !important; }
  .masthead-inner {
    flex-wrap: nowrap !important;
    font-size: 9px !important;
    gap: 8px !important;
  }
  .navbar .menu-toggle {
    display: flex !important;
  }
  .main-content {
    margin-left: 0 !important;
    padding: 86px 16px 24px !important;
    max-width: 100% !important;
    width: 100% !important;
    overflow-x: hidden;
  }
  .admin-main {
    margin-left: 0 !important;
    padding: 86px 16px 24px !important;
    max-width: 100% !important;
    overflow-x: hidden;
  }
  .menu-toggle { display: flex; }
  .stat-row { grid-template-columns: repeat(2, 1fr); }
  .stat-row .stat-card, .stat-row > .stat {
    border-right: none;
    border-bottom: 1px solid var(--rule-strong);
  }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--ink);
    flex-direction: column;
    gap: 0;
    padding: 16px 24px;
  }
  .footer-ink .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .section { padding: 56px 0; }
  .marquee-track { font-size: 1.1rem; gap: 32px; }
  .marquee-track span::after { margin-left: 32px; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .container,
  .container-narrow,
  .navbar-inner,
  .masthead-inner {
    padding-left: 16px;
    padding-right: 16px;
  }
  [style*="grid-template-columns:1fr 1fr"],
  [style*="grid-template-columns: 1fr 1fr"],
  [style*="grid-template-columns:1fr auto"],
  [style*="grid-template-columns: 1fr auto"],
  [style*="grid-template-columns:1fr 340px"],
  [style*="grid-template-columns: 1fr 340px"],
  [style*="grid-template-columns:1fr 380px"],
  [style*="grid-template-columns: 1fr 380px"],
  [style*="grid-template-columns:300px 1fr"],
  [style*="grid-template-columns: 300px 1fr"],
  [style*="grid-template-columns:80px 1fr auto"],
  [style*="grid-template-columns: 80px 1fr auto"],
  [style*="grid-template-columns:100px 1fr auto"],
  [style*="grid-template-columns: 100px 1fr auto"],
  [style*="grid-template-columns:1.4fr 1fr"],
  [style*="grid-template-columns: 1.4fr 1fr"],
  [style*="grid-template-columns:2fr 1fr"],
  [style*="grid-template-columns: 2fr 1fr"],
  [style*="grid-template-columns:repeat(2"],
  [style*="grid-template-columns: repeat(2"],
  [style*="grid-template-columns:repeat(3"],
  [style*="grid-template-columns: repeat(3"],
  [style*="grid-template-columns:repeat(4"],
  [style*="grid-template-columns: repeat(4"],
  [style*="grid-template-columns:repeat(5"],
  [style*="grid-template-columns: repeat(5"],
  [style*="grid-template-columns:repeat(auto-fit"],
  [style*="grid-template-columns: repeat(auto-fit"],
  [style*="grid-template-columns:repeat(auto-fill"] {
    grid-template-columns: minmax(0, 1fr) !important;
  }
  [style*="grid-template-columns: repeat(auto-fill"] {
    grid-template-columns: minmax(0, 1fr) !important;
  }
  [style*="display:flex"][style*="justify-content:space-between"],
  [style*="display:flex"][style*="align-items:center"],
  [style*="display: flex"][style*="justify-content: space-between"],
  [style*="display: flex"][style*="align-items: center"] {
    flex-wrap: wrap !important;
  }
  .marquee {
    max-width: 100vw;
    contain: paint;
  }
  [style*="max-width:480px"],
  [style*="max-width:500px"],
  [style*="max-width:560px"],
  [style*="max-width:640px"] {
    max-width: 100% !important;
  }
  img,
  svg,
  video,
  canvas,
  iframe {
    max-width: 100%;
    height: auto;
  }
  .glass-card,
  .feature-card,
  .course-card,
  .chapter-card,
  .practice-card,
  .subject-panel {
    max-width: 100%;
  }
}

@media (max-width: 480px) {
  .display-hero { font-size: clamp(2.2rem, 16vw, 3rem); }
  .display-xl { font-size: clamp(2rem, 13vw, 2.7rem); }
  .display-lg { font-size: clamp(1.65rem, 10vw, 2.2rem); }
  .btn-primary,
  .btn-rust,
  .btn-ink,
  .btn-secondary,
  .btn-ghost,
  .btn-gold {
    min-height: 44px;
    white-space: normal;
    text-align: center;
    justify-content: center;
  }
  .notification {
    left: 12px;
    right: 12px;
    top: 12px;
    max-width: none;
  }
  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
  }
}

/* ==========================================================
   PARTICLES — neutralize (paper aesthetic has no particles)
   ========================================================== */

.particles, .particle { display: none !important; }

/* ==========================================================
   FORM STATES / MISC
   ========================================================== */

a { color: var(--rust); text-decoration: underline; text-underline-offset: 3px; }
a.nav-link, a.btn-primary, a.btn-secondary, a.btn-ink, a.btn-rust, a.btn-ghost, a.btn-gold, a.sidebar-link, a.brand { text-decoration: none; }

hr { border: 0; border-top: 1px solid var(--ink); margin: 32px 0; }

code { font-family: var(--font-mono); background: var(--paper-soft); border: 1px solid var(--rule); padding: 1px 6px; font-size: 0.9em; }

/* ==========================================================
   EDUCATION-PLATFORM COMPONENTS
   ========================================================== */

/* Highlighter — rust marker underline */
.highlight {
  background-image: linear-gradient(120deg, transparent 0, transparent 60%, rgba(201,78,31,0.35) 60%, rgba(201,78,31,0.35) 95%, transparent 95%);
  padding: 0 2px;
}
.highlight-forest {
  background-image: linear-gradient(120deg, transparent 0, transparent 60%, rgba(46,90,62,0.30) 60%, rgba(46,90,62,0.30) 95%, transparent 95%);
  padding: 0 2px;
}
.highlight-yellow {
  background-image: linear-gradient(120deg, transparent 0, transparent 55%, rgba(220,180,60,0.55) 55%, rgba(220,180,60,0.55) 95%, transparent 95%);
  padding: 0 2px;
}

/* Notebook ruled-line background */
.notebook-bg {
  background-color: var(--paper-soft);
  background-image:
    linear-gradient(var(--paper-soft) 95%, var(--rule) 95%);
  background-size: 100% 32px;
  background-position: 0 6px;
}

/* Sticky note — styled as a modern rounded alert/card */
.sticky-note {
  background: #FFFBEB;
  color: #92400E;
  padding: 20px;
  font-family: var(--font-sans);
  font-style: normal;
  font-weight: 500;
  font-size: 14px;
  line-height: 1.5;
  box-shadow: none;
  position: relative;
  transform: none !important;
  border: 1px solid #FDE68A;
  border-radius: 12px;
}
.sticky-note.tilt-right { background: #FEF3C7; border-color: #FDE68A; }
.sticky-note.tilt-flat { background: #ECFDF5; border-color: #A7F3D0; color: #065F46; }

.sticky-note::before { display: none; }

/* Floating formula tile */
.formula-tile {
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  border: 1px solid #E2E8F0;
  background: #FFFFFF;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 13px;
  color: var(--ink);
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.02);
  letter-spacing: 0.02em;
}

.formula-tile-ink {
  background: var(--ink);
  color: var(--paper);
  box-shadow: 3px 3px 0 var(--rust);
}

.formula-tile-rust {
  background: var(--rust);
  color: var(--paper);
  border-color: var(--ink);
  box-shadow: 3px 3px 0 var(--ink);
}

/* Periodic table tile */
.periodic-tile {
  width: 64px;
  height: 64px;
  border: 1px solid var(--ink);
  background: var(--paper);
  padding: 4px 6px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  font-family: var(--font-mono);
  color: var(--ink);
  text-align: left;
}
.periodic-tile .ptn { font-size: 9px; line-height: 1; opacity: 0.6; }
.periodic-tile .pts { font-family: var(--font-display); font-weight: 800; font-size: 22px; line-height: 1; }
.periodic-tile .ptm { font-size: 8px; line-height: 1; opacity: 0.7; }
.periodic-tile.rust { background: var(--rust); color: var(--paper); }
.periodic-tile.forest { background: var(--forest); color: var(--paper); }
.periodic-tile.ink { background: var(--ink); color: var(--paper); }

/* Interactive practice question card */
.practice-card {
  background: var(--paper);
  border: 1px solid var(--ink);
  padding: 28px;
  box-shadow: 8px 8px 0 var(--ink);
  position: relative;
}

.practice-card .practice-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 16px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--ink);
}

.practice-card .practice-q {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  line-height: 1.35;
  color: var(--ink);
  margin-bottom: 18px;
}

.practice-card .quiz-options {
  display: grid;
  gap: 10px;
}

.quiz-opt {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--ink);
  background: var(--paper-soft);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 14px;
  color: var(--ink);
  cursor: pointer;
  transition: all 0.12s;
  text-align: left;
  width: 100%;
}

.quiz-opt:hover:not(.locked) {
  background: var(--ink);
  color: var(--paper);
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 var(--rust);
}

.quiz-opt .opt-letter {
  width: 28px; height: 28px;
  display: grid; place-items: center;
  border: 1px solid currentColor;
  border-radius: 50%;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 12px;
  flex-shrink: 0;
}

.quiz-opt.correct {
  background: var(--forest) !important;
  color: var(--paper) !important;
  border-color: var(--forest);
  pointer-events: none;
}
.quiz-opt.wrong {
  background: var(--rust) !important;
  color: var(--paper) !important;
  border-color: var(--rust);
  pointer-events: none;
}
.quiz-opt.locked { pointer-events: none; opacity: 0.7; }

.quiz-feedback {
  margin-top: 14px;
  padding: 14px;
  border: 1px solid var(--ink);
  font-family: var(--font-sans);
  font-size: 13px;
  line-height: 1.5;
  background: var(--paper-soft);
  display: none;
}
.quiz-feedback.show { display: block; }
.quiz-feedback strong { font-family: var(--font-display); }

/* Subject explorer tabs */
.subject-tabs {
  display: flex;
  gap: 8px;
  border: none;
  background: transparent;
  margin-bottom: 16px;
}
.subject-tab {
  flex: 1;
  padding: 14px 20px;
  background: #FFFFFF;
  border: 1px solid #E2E8F0;
  border-radius: 8px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 14px;
  color: var(--ink-soft);
  cursor: pointer;
  text-align: center;
  justify-content: center;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  gap: 10px;
}
.subject-tab:last-child { border-right: none; }
.subject-tab:hover { background: #F8FAFC; border-color: var(--rust); }
.subject-tab.active { background: var(--rust); color: #FFFFFF; border-color: var(--rust); }
.subject-tab .tab-letter {
  font-family: var(--font-sans);
  font-weight: 800;
  font-style: normal;
  font-size: 1.2rem;
  line-height: 1;
}

.subject-panel {
  display: none;
  padding: 32px;
  border: 1px solid #E2E8F0;
  border-radius: 12px;
  background: #FFFFFF;
  box-shadow: 0 4px 12px rgba(15,23,42,0.02);
}
.subject-panel.active { display: block; }

.chapter-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0; border-top: 1px solid var(--rule); }
.chapter-row {
  display: grid;
  grid-template-columns: 32px 1fr auto auto;
  gap: 16px;
  align-items: center;
  padding: 14px 16px;
  border-bottom: 1px solid var(--rule);
  font-family: var(--font-sans);
  cursor: pointer;
  transition: background 0.12s;
}
.chapter-row:hover { background: var(--paper-soft); }
.chapter-row .ch-num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  color: var(--rust);
}
.chapter-row .ch-name { font-weight: 600; color: var(--ink); font-size: 14px; }
.chapter-row .ch-progress {
  width: 60px;
  height: 6px;
  background: var(--paper-deep);
  border: none;
  border-radius: 3px;
  overflow: hidden;
}
.chapter-row .ch-progress-fill { height: 100%; background: var(--rust); border-radius: 3px; }
.chapter-row .ch-pct { font-family: var(--font-mono); font-size: 12px; color: var(--ink-mute); min-width: 36px; text-align: right; }

/* Streak / consistency grid (GitHub-style) */
.streak-grid {
  display: grid;
  grid-template-columns: repeat(26, 1fr);
  gap: 4px;
  padding: 24px;
  border: 1px solid var(--ink);
  background: var(--paper-soft);
}
.streak-cell {
  aspect-ratio: 1;
  background: var(--paper-deep);
  border: 1px solid var(--rule);
}
.streak-cell.l1 { background: rgba(201,78,31,0.25); }
.streak-cell.l2 { background: rgba(201,78,31,0.5); }
.streak-cell.l3 { background: rgba(201,78,31,0.75); }
.streak-cell.l4 { background: var(--rust); }

/* Rank predictor widget */
.rank-predictor {
  border: 1px solid var(--ink);
  padding: 32px;
  background: var(--paper-soft);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 32px;
  align-items: center;
}
.rank-input {
  width: 100%;
  border: 1px solid var(--ink);
  background: var(--paper);
  padding: 18px 20px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 2rem;
  color: var(--ink);
  text-align: center;
  outline: none;
}
.rank-arrow {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 2.5rem;
  color: var(--rust);
}
.rank-output {
  text-align: center;
}
.rank-output .rank-num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 3rem;
  line-height: 1;
  color: var(--rust);
}

/* Live activity feed ticker */
.activity-feed {
  border: 1px solid var(--ink);
  background: var(--paper-soft);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  overflow: hidden;
}
.activity-pulse {
  width: 10px; height: 10px;
  background: var(--forest);
  border-radius: 50%;
  flex-shrink: 0;
  animation: pulse-dot 1.8s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.7); }
}
.activity-track {
  flex: 1;
  overflow: hidden;
  position: relative;
  height: 24px;
}
.activity-item {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--ink);
  opacity: 0;
  transition: opacity 0.35s, transform 0.35s;
  transform: translateY(10px);
}
.activity-item.show { opacity: 1; transform: translateY(0); }
.activity-item strong { font-weight: 700; }
.activity-item em { font-style: italic; color: var(--rust); font-weight: 600; }

/* Floating XP / streak badges */
.float-badge {
  position: absolute;
  background: var(--paper);
  border: 1px solid var(--ink);
  padding: 10px 14px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--ink);
  box-shadow: 3px 3px 0 var(--ink);
  z-index: 3;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.float-badge.rust { background: var(--rust); color: var(--paper); box-shadow: 3px 3px 0 var(--ink); }
.float-badge.forest { background: var(--forest); color: var(--paper); box-shadow: 3px 3px 0 var(--ink); }
.float-badge.ink { background: var(--ink); color: var(--paper); box-shadow: 3px 3px 0 var(--rust); }

.float-badge i { font-size: 13px; }

/* Hover lift utility */
.lift {
  transition: transform 0.15s, box-shadow 0.15s;
}
.lift:hover {
  transform: translate(-3px, -3px);
  box-shadow: 6px 6px 0 var(--ink);
}

/* Typed cursor */
.typed-cursor {
  display: inline-block;
  width: 3px;
  height: 0.85em;
  background: var(--rust);
  vertical-align: text-bottom;
  margin-left: 4px;
  animation: blink 0.9s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* Subject icon (drawn) — bigger course-thumb variant */
.subject-icon {
  display: inline-grid;
  place-items: center;
  width: 80px;
  height: 80px;
  border: 1px solid var(--ink);
  background: var(--paper-soft);
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: 3rem;
  color: var(--ink);
  flex-shrink: 0;
}
.subject-icon.rust { background: var(--rust); color: var(--paper); }
.subject-icon.forest { background: var(--forest); color: var(--paper); }
.subject-icon.ink { background: var(--ink); color: var(--paper); }

/* Mock test timer band */
.timer-band {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  padding: 12px 20px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 12px;
  border: 1px solid var(--ink);
}
.timer-band .timer-dot {
  width: 8px; height: 8px;
  background: var(--rust);
  border-radius: 50%;
  animation: pulse-dot 1.2s ease-in-out infinite;
}

/* Scroll-reveal observed elements */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in { opacity: 1; transform: translateY(0); }

/* Decorative margin sketch — used as the right-side hero scribble */
.sketch-frame {
  position: relative;
  border: 1px solid var(--ink);
  padding: 28px;
  background: var(--paper);
}
.sketch-frame::before {
  content: '';
  position: absolute;
  top: -6px; left: -6px;
  right: 6px; bottom: 6px;
  border: 1px solid var(--ink);
  z-index: -1;
}

/* Education-themed mobile tweaks */
@media (max-width: 768px) {
  .rank-predictor { grid-template-columns: 1fr; gap: 16px; text-align: center; }
  .rank-arrow { transform: rotate(90deg); }
  .chapter-list { grid-template-columns: 1fr; }
  .subject-tabs { flex-direction: column; }
  .subject-tab { border-right: none; border-bottom: 1px solid var(--ink); }
  .subject-tab:last-child { border-bottom: none; }
  .streak-grid { grid-template-columns: repeat(13, 1fr); }
  .practice-card { box-shadow: 4px 4px 0 var(--ink); padding: 20px; }
}

/* Booklet Set Mini Cards styling */
.set-card-mini {
  display: flex !important;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 8px !important;
  border: 1px solid var(--ink) !important;
  border-radius: 8px !important;
  background: var(--paper) !important;
  color: var(--ink) !important;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
}
.set-card-mini:hover {
  border-color: var(--rust) !important;
  background: var(--paper-soft) !important;
}
.set-card-mini.active {
  background: var(--rust) !important;
  color: #FFFFFF !important;
  border-color: var(--rust) !important;
}
.set-card-mini i {
  color: var(--rust);
  font-size: 16px;
  margin-top: 4px;
}
.set-card-mini.active i {
  color: #FFFFFF !important; /* Ensure icons turn white when selected */
}