/* CC English Student Hub — Shared design tokens & primitives
   Matches the giveaway hub palette (ink/gold/cream + Playfair/Plus Jakarta) */

/* === Dark theme (default) — deep coffee black + bright accents === */
:root, :root[data-theme="dark"] {
  --ink: #14100c;            /* deeper coffee-black — true dark for sharper contrast */
  --ink2: #221c16;           /* card bg, clearly lifted from page */
  --ink3: #3e3429;           /* dividers */
  --gold: #e2b252;           /* brighter — pops on deep dark */
  --gold-hi: #f0cc82;        /* warm cream-gold for accents */
  --gold-lo: rgba(226, 178, 82, 0.22);
  --cream: #fdf9f0;          /* near-white text */
  --cream-dim: rgba(253, 249, 240, 0.93);
  --grey: #c8bea8;           /* secondary text */
  --line: rgba(253, 249, 240, 0.10);
  --line-strong: rgba(253, 249, 240, 0.22);
  --green: #2d6a4f;
  --green-hi: #6dc991;
  --red: #c1121f;
  --red-hi: #ff8a7a;
  --teal: #0d9488;
  --teal-hi: #6ee7d7;
  --purple: #7c3aed;
  --purple-hi: #b8a0fd;
}

/* === Light theme — warm amber accents distinct from text === */
:root[data-theme="light"] {
  --ink: #f5eedb;            /* warm cream background */
  --ink2: #ffffff;           /* card bg = pure white */
  --ink3: #dbcfa8;
  --gold: #c08020;           /* warmer saturated amber — clearly distinct from dark text */
  --gold-hi: #8a5510;        /* deep amber (NOT brown — saturated) for strong emphasis */
  --gold-lo: rgba(192, 128, 32, 0.18);
  --cream: #1f1a14;          /* near-black brown text */
  --cream-dim: rgba(31, 26, 20, 0.85);
  --grey: #5a5048;
  --line: rgba(31, 26, 20, 0.16);
  --line-strong: rgba(31, 26, 20, 0.30);
  --green: #1b7a3f;
  --green-hi: #0e5a2c;
  --red: #a81818;
  --red-hi: #6b0c0c;
  --teal: #0a7269;
  --teal-hi: #044a44;
  --purple: #5028b4;
  --purple-hi: #34167a;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Plus Jakarta Sans', 'Noto Serif TC', -apple-system, sans-serif;
  background: var(--ink);
  color: var(--cream);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  min-height: 100vh;
}

/* Background ornaments — bigger grid for less busy feel */
.bg-grid {
  position: fixed; inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 96px 96px;
  pointer-events: none; z-index: 0; opacity: 0.55;
}
.bg-orb {
  position: fixed; top: -20%; right: -10%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, var(--gold-lo) 0%, transparent 60%);
  filter: blur(60px); pointer-events: none; z-index: 0;
}
.bg-orb-2 {
  position: fixed; bottom: -30%; left: -15%;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(167,139,250,0.06) 0%, transparent 60%);
  filter: blur(80px); pointer-events: none; z-index: 0;
}
.bg-noise {
  position: fixed; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  opacity: 0.025; pointer-events: none; z-index: 0;
}

/* Logo / nav primitive */
.logo {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: 'Playfair Display', serif;
  font-weight: 600; font-size: 1.1rem; letter-spacing: 0.02em;
  color: var(--cream); text-decoration: none;
}
.logo-mark {
  width: 28px; height: 28px;
  background: linear-gradient(135deg, var(--gold), var(--gold-hi));
  transform: rotate(45deg); border-radius: 4px; position: relative;
}
.logo-mark::after {
  content: ''; position: absolute; inset: 6px;
  border: 1px solid rgba(20, 17, 13, 0.3); border-radius: 2px;
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 6px; padding: 10px 18px;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 0.82rem; font-weight: 600;
  letter-spacing: 0.02em; border-radius: 999px;
  text-decoration: none; border: 1px solid transparent;
  cursor: pointer; transition: all 0.25s ease; white-space: nowrap;
}
.btn-primary { background: var(--gold); color: var(--ink); }
.btn-primary:hover { background: var(--gold-hi); transform: translateY(-1px); box-shadow: 0 6px 20px rgba(200, 146, 56, 0.3); }
.btn-ghost { background: transparent; color: var(--cream); border-color: var(--line-strong); }
.btn-ghost:hover { background: var(--gold-lo); border-color: var(--gold); color: var(--gold-hi); }
.btn-lg { padding: 14px 28px; font-size: 0.9rem; }
.btn-wa {
  background: linear-gradient(135deg, #25D366, #128C7E);
  color: #fff;
}
.btn-wa:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(37,211,102,0.35); }

/* Card primitive */
.card {
  background: var(--ink2);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
  position: relative;
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}
.card.linkish {
  text-decoration: none; color: inherit; display: block;
}
.card.linkish:hover {
  transform: translateY(-4px);
  border-color: rgba(200, 146, 56, 0.3);
  box-shadow: 0 16px 48px rgba(0,0,0,0.5), 0 0 40px rgba(200,146,56,0.06);
}
.card.glow::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent 0%, var(--gold) 50%, transparent 100%);
  opacity: 0; transition: opacity 0.3s;
}
.card.glow:hover::before { opacity: 1; }

/* Text rhythm */
.eyebrow {
  font-family: 'DM Mono', monospace;
  font-size: 0.7rem; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--gold);
}
.h-display {
  font-family: 'Noto Serif TC', serif;
  font-weight: 600;
  line-height: 1.25;
}
.h-display em, .h-display .accent {
  font-family: 'Playfair Display', serif;
  font-style: italic; color: var(--gold-hi);
  font-weight: 500;
}
.body-quiet {
  color: var(--cream-dim);
  font-family: 'Noto Serif TC', serif;
  line-height: 1.75;
}

/* Tag chip */
.chip {
  display: inline-block;
  font-family: 'DM Mono', monospace;
  font-size: 0.62rem; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--gold);
  padding: 3px 10px;
  border: 1px solid var(--gold-lo);
  border-radius: 999px;
}
.chip.muted {
  color: var(--cream-dim);
  border-color: var(--line);
  background: rgba(250,246,238,0.04);
}

/* Reveal animation */
.rev {
  opacity: 0; transform: translateY(20px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.rev.in { opacity: 1; transform: none; }
.d1 { transition-delay: 0.08s; }
.d2 { transition-delay: 0.16s; }
.d3 { transition-delay: 0.24s; }

/* Mobile */
@media (max-width: 768px) {
  .btn { padding: 8px 14px; font-size: 0.76rem; }
  .btn-lg { padding: 12px 22px; font-size: 0.84rem; }
}

/* === Mobile tap targets (touch devices only) — iOS / Android 44px minimum === */
@media (hover: none) and (pointer: coarse) {
  button, .btn, .logout-btn, .tab, .cat-tab, .paper-tab,
  .mc-opt, .opt, .slot, .drill-row, .col-drill-item,
  a.book-btn, a.paper-btn, a.lesson-card, a.drill-card {
    min-height: 44px;
  }
  /* Dot navigation — keep small visually but ensure tappable */
  .dot {
    min-width: 24px;
    min-height: 24px;
    padding: 4px;
  }
}

/* === Stat cards 4-col → 2x2 on narrow phones === */
@media (max-width: 500px) {
  .dr-stats,
  .stats,
  .drill-stats {
    grid-template-columns: 1fr 1fr !important;
  }
  /* Numbers slightly larger in 2-col layout (more room per cell) */
  .dr-stat .num, .stat-card .num {
    font-size: 1.4rem;
  }
}

/* === MC option buttons stack on narrow phones === */
@media (max-width: 420px) {
  .mc-opts {
    grid-template-columns: 1fr !important;
  }
  /* T/F/NG buttons full width, comfortable padding */
  .mc-opt {
    padding: 14px 16px;
    font-size: 14px;
  }
}

/* === Body / passage line-height & padding on phones (legibility) === */
@media (max-width: 600px) {
  /* Prevent iOS zoom on focus for form inputs */
  input, textarea, select { font-size: 16px; }
  /* Tighter side padding so passages don't waste horizontal space */
  .passage, .paragraph-box, .lesson-card { padding-left: 16px; padding-right: 16px; }
}