/* ============================================================
   koindian — design tokens
   Ink Indigo   #1B1E3D  (base / ink)
   Rice Paper   #F6F0E4  (light section bg)
   Dancheong Red #C1443D (primary accent — palace red)
   Marigold     #E8A33D  (secondary accent — warm)
   Jade Celadon #3F7D69  (tertiary accent — cool)
   Plum Ink     #6B4368  (hover / depth)
   ============================================================ */

:root {
  --ink: #1B1E3D;
  --ink-soft: #2A2E52;
  --paper: #F6F0E4;
  --paper-dim: #EDE4D2;
  --red: #C1443D;
  --marigold: #E8A33D;
  --jade: #3F7D69;
  --plum: #6B4368;
  --cream-text: #F3ECDC;
  --ink-text: #23233A;
  --line: rgba(27, 30, 61, 0.12);
  --line-on-ink: rgba(246, 240, 228, 0.16);

  --font-display: "Fraunces", "Noto Serif KR", serif;
  --font-body: "Inter", "Noto Sans Devanagari", sans-serif;
  --font-kr: "Noto Serif KR", serif;
  --font-hi: "Noto Sans Devanagari", "Inter", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  --radius-block: 6px;
  --radius-card: 18px;
  --shadow-card: 0 8px 30px rgba(27, 30, 61, 0.08);
  --shadow-card-hover: 0 14px 40px rgba(27, 30, 61, 0.14);

  --max-w: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }

.kr { font-family: var(--font-kr); }
.hi { font-family: var(--font-hi); }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  margin: 0 0 0.4em;
  letter-spacing: -0.01em;
  color: var(--ink);
}

p { margin: 0 0 1em; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--red);
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
}

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 28px;
}

:focus-visible {
  outline: 3px solid var(--marigold);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------------- Nav ---------------- */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(246, 240, 228, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.site-nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.wordmark {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--ink);
  display: flex;
  align-items: baseline;
  gap: 6px;
}
.wordmark .dot { color: var(--red); }

.nav-links {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-size: 0.92rem;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 999px;
  color: var(--ink-soft);
  transition: background 0.15s ease, color 0.15s ease;
}
.nav-links a:hover { background: var(--paper-dim); }
.nav-links a.active { background: var(--ink); color: var(--cream-text); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle svg { width: 24px; height: 24px; }

@media (max-width: 820px) {
  .nav-links {
    position: fixed;
    inset: 72px 0 0 0;
    background: var(--paper);
    flex-direction: column;
    padding: 20px 28px;
    gap: 4px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
  }
  .nav-links.open { opacity: 1; transform: translateY(0); pointer-events: auto; }
  .nav-links a { display: block; padding: 14px 16px; font-size: 1.05rem; }
  .nav-toggle { display: block; }
}

/* ---------------- Hero / Hangul block signature ---------------- */

.hero {
  background: var(--ink);
  color: var(--cream-text);
  padding: 72px 0 96px;
  position: relative;
  overflow: hidden;
}

.hero .wrap {
  display: grid;
  grid-template-columns: minmax(260px, 380px) 1fr;
  gap: 56px;
  align-items: center;
}

.hangul-build {
  --u: 34px;
  width: calc(var(--u) * 3);
  height: calc(var(--u) * 3);
  position: relative;
  margin: 0 auto;
}
.hangul-build .stroke {
  position: absolute;
  background: var(--paper);
  border-radius: 3px;
  opacity: 0;
  transform: scale(0.4);
  animation: strokeIn 0.6s cubic-bezier(.2,.8,.3,1) forwards;
}
/* ㅎ (h) — top-left */
.hangul-build .s1 { top: 0; left: 0; width: calc(var(--u) * 1.3); height: 6px; animation-delay: 0.1s; }
.hangul-build .s2 { top: 16px; left: 4px; width: calc(var(--u) * 1.1); height: 6px; animation-delay: 0.25s; }
.hangul-build .s3 { top: 30px; left: 10px; width: 46px; height: 46px; border-radius: 50%; background: transparent; border: 6px solid var(--paper); animation-delay: 0.4s; }
/* ㅏ (a) — right vertical + tick */
.hangul-build .s4 { top: 0; right: 0; width: 6px; height: calc(var(--u) * 2.6); animation-delay: 0.55s; }
.hangul-build .s5 { top: 40px; right: 16px; width: 20px; height: 6px; animation-delay: 0.7s; }
/* ㄴ (n) — bottom block */
.hangul-build .s6 { bottom: 0; left: 0; width: 6px; height: 40px; animation-delay: 0.9s; }
.hangul-build .s7 { bottom: 0; left: 0; width: calc(var(--u) * 2.5); height: 6px; animation-delay: 1.05s; }

@keyframes strokeIn {
  to { opacity: 1; transform: scale(1); }
}

.hangul-caption {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(246, 240, 228, 0.55);
  margin-top: 18px;
}

.hero h1 {
  color: var(--cream-text);
  font-size: clamp(2.2rem, 4.4vw, 3.4rem);
  line-height: 1.12;
  margin-bottom: 0.3em;
}
.hero h1 .accent { color: var(--marigold); }

.hero .lede {
  font-size: 1.1rem;
  color: rgba(246, 240, 228, 0.82);
  max-width: 52ch;
  margin-bottom: 1.8em;
}

.btn-row { display: flex; flex-wrap: wrap; gap: 14px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 24px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--red); color: var(--cream-text); }
.btn-primary:hover { background: #a83731; }
.btn-ghost { border-color: var(--line-on-ink); color: var(--cream-text); }
.btn-ghost:hover { border-color: var(--marigold); }
.btn-ink { background: var(--ink); color: var(--cream-text); }
.btn-ink:hover { background: var(--ink-soft); }

/* ---------------- Stat plaques ---------------- */

.stats {
  background: var(--paper-dim);
  border-bottom: 1px solid var(--line);
}
.stats .wrap {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
}
.stat-plaque {
  background: var(--paper-dim);
  padding: 28px 20px;
  text-align: center;
}
.stat-plaque .num {
  font-family: var(--font-display);
  font-size: 2.1rem;
  color: var(--ink);
  font-weight: 700;
}
.stat-plaque .label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  text-transform: uppercase;
  margin-top: 4px;
}
.stat-plaque .label-hi {
  font-family: var(--font-hi);
  font-size: 0.85rem;
  color: var(--plum);
  margin-top: 2px;
}
@media (max-width: 720px) {
  .stats .wrap { grid-template-columns: repeat(2, 1fr); }
}

/* ---------------- Section shells ---------------- */

.section { padding: 88px 0; }
.section-tight { padding: 56px 0; }
.section-header { max-width: 60ch; margin-bottom: 44px; }
.section-header h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
.section-header p { color: var(--ink-soft); font-size: 1.05rem; }

.section-ink { background: var(--ink); color: var(--cream-text); }
.section-ink h2, .section-ink h3, .section-ink h4 { color: var(--cream-text); }
.section-ink .section-header p { color: rgba(246, 240, 228, 0.75); }

/* ---------------- Path cards (Explore grid) ---------------- */

.path-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
@media (max-width: 980px) { .path-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .path-grid { grid-template-columns: 1fr; } }

.path-card {
  background: #fff;
  border-radius: var(--radius-card);
  padding: 26px 24px;
  box-shadow: var(--shadow-card);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.path-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card-hover); }

.path-card .glyph {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-block);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-kr);
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
}
.path-card .count {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-soft);
  opacity: 0.7;
}
.path-card h3 { font-size: 1.15rem; margin-bottom: 2px; }
.path-card p { font-size: 0.92rem; color: var(--ink-soft); margin-bottom: 0; }

/* ---------------- Lesson preview card ---------------- */

.preview-card {
  background: #fff;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--line);
  overflow: hidden;
}
.preview-head {
  background: var(--jade);
  color: var(--cream-text);
  padding: 20px 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.preview-head .tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.85;
}
.preview-body { padding: 28px; }
.preview-body .ko-line { font-family: var(--font-kr); font-size: 1.6rem; color: var(--ink); margin-bottom: 4px; }
.preview-body .hi-line { font-family: var(--font-hi); font-size: 1.1rem; color: var(--plum); margin-bottom: 20px; }
.example-bubble {
  background: var(--paper-dim);
  border-radius: 12px;
  padding: 14px 18px;
  margin-bottom: 10px;
}
.example-bubble .ko { font-family: var(--font-kr); font-weight: 600; color: var(--ink); }
.example-bubble .hi { font-family: var(--font-hi); color: var(--ink-soft); font-size: 0.95rem; margin-top: 2px; }

/* ---------------- Accordions (chapters / grammar / vocab) ---------------- */

.acc-list { display: flex; flex-direction: column; gap: 14px; }

.acc-item {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.acc-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-body);
}

.acc-number {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #fff;
  background: var(--red);
  width: 34px;
  height: 34px;
  border-radius: var(--radius-block);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.acc-title { flex: 1; }
.acc-title .en { font-weight: 700; color: var(--ink); font-size: 1.02rem; }
.acc-title .ko { font-family: var(--font-kr); color: var(--plum); font-size: 0.92rem; margin-top: 2px; }

.acc-chevron { transition: transform 0.2s ease; color: var(--ink-soft); flex-shrink: 0; }
.acc-item.open .acc-chevron { transform: rotate(180deg); }

.acc-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.acc-item.open .acc-panel { max-height: 4000px; }
.acc-panel-inner { padding: 0 24px 24px; border-top: 1px solid var(--line); padding-top: 20px; }

.lesson-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.15s ease;
}
.lesson-row:hover { background: var(--paper-dim); }
.lesson-row .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--jade); flex-shrink: 0; }
.lesson-row .en { font-weight: 600; font-size: 0.95rem; }
.lesson-row .ko { font-family: var(--font-kr); color: var(--ink-soft); font-size: 0.85rem; }

.lesson-detail {
  display: none;
  margin-top: 10px;
  padding: 18px 20px;
  background: var(--paper-dim);
  border-radius: 12px;
}
.lesson-detail.open { display: block; }
.lesson-detail .explain { color: var(--ink-soft); font-size: 0.95rem; margin-bottom: 14px; }
.lesson-detail .explain-label { font-family: var(--font-mono); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--red); display: block; margin-bottom: 6px; }

/* ---------------- Vocabulary tables ---------------- */

.vocab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 10px;
  margin-top: 16px;
}
.vocab-word {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
  padding: 12px 16px;
  background: var(--paper-dim);
  border-radius: 10px;
}
.vocab-word .ko { font-family: var(--font-kr); font-weight: 600; color: var(--ink); }
.vocab-word .roman { font-family: var(--font-mono); font-size: 0.72rem; color: var(--ink-soft); opacity: 0.7; display: block; }
.vocab-word .hi { font-family: var(--font-hi); color: var(--plum); text-align: right; font-size: 0.95rem; }

.category-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 36px;
}
.pill {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  cursor: pointer;
  color: var(--ink-soft);
  transition: all 0.15s ease;
}
.pill:hover { border-color: var(--jade); color: var(--jade); }
.pill.active { background: var(--ink); color: var(--cream-text); border-color: var(--ink); }

/* ---------------- Quiz ---------------- */

.quiz-box {
  background: var(--paper-dim);
  border-radius: 16px;
  padding: 22px 24px;
  margin-top: 20px;
}
.quiz-progress {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-soft);
  margin-bottom: 14px;
}
.quiz-question .ko {
  font-family: var(--font-kr);
  font-size: 1.25rem;
  color: var(--ink);
  margin-bottom: 4px;
}
.quiz-hi { font-family: var(--font-hi); color: var(--ink-soft); font-size: 0.88rem; margin-bottom: 18px; }
.quiz-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 18px;
}
@media (max-width: 520px) { .quiz-options { grid-template-columns: 1fr; } }
.quiz-option {
  padding: 12px 16px;
  border-radius: 10px;
  border: 2px solid var(--line);
  background: #fff;
  font-family: var(--font-kr);
  font-size: 1.05rem;
  cursor: pointer;
  text-align: center;
  transition: all 0.15s ease;
}
.quiz-option:hover { border-color: var(--jade); }
.quiz-option.correct { border-color: var(--jade); background: rgba(63,125,105,0.12); }
.quiz-option.wrong { border-color: var(--red); background: rgba(193,68,61,0.12); }
.quiz-option[disabled] { cursor: default; }
.quiz-footer { display: flex; justify-content: space-between; align-items: center; }
.quiz-score { font-family: var(--font-mono); font-size: 0.85rem; color: var(--ink-soft); }
.quiz-result {
  text-align: center;
  padding: 30px 20px;
}
.quiz-result .big { font-family: var(--font-display); font-size: 2.4rem; color: var(--ink); }

/* ---------------- Sentences ---------------- */

.sentence-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 14px 18px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  margin-bottom: 8px;
}
.sentence-row .ko { font-family: var(--font-kr); font-weight: 600; color: var(--ink); }
.sentence-row .hi { font-family: var(--font-hi); color: var(--ink-soft); font-size: 0.9rem; margin-top: 2px; }

/* ---------------- Search ---------------- */

.search-box {
  display: flex;
  align-items: center;
  gap: 12px;
  background: #fff;
  border: 2px solid var(--line);
  border-radius: 999px;
  padding: 10px 20px;
  max-width: 480px;
}
.search-box input {
  border: none;
  outline: none;
  flex: 1;
  font-size: 1rem;
  font-family: var(--font-hi);
  background: none;
}
.search-box:focus-within { border-color: var(--jade); }

/* ---------------- Contact page ---------------- */

.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
}
@media (max-width: 820px) { .contact-grid { grid-template-columns: 1fr; } }

.field { margin-bottom: 20px; }
.field label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  margin-bottom: 6px;
}
.field input, .field textarea, .field select {
  width: 100%;
  padding: 13px 16px;
  border-radius: 10px;
  border: 1.5px solid var(--line);
  font-family: var(--font-body);
  font-size: 0.98rem;
  background: #fff;
  resize: vertical;
}
.field input:focus, .field textarea:focus, .field select:focus {
  outline: none;
  border-color: var(--jade);
}

.contact-info-card {
  background: var(--ink);
  color: var(--cream-text);
  border-radius: var(--radius-card);
  padding: 30px 28px;
}
.contact-info-card h3 { color: var(--cream-text); }
.contact-line {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-on-ink);
}
.contact-line:last-child { border-bottom: none; }
.contact-line .label { font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; opacity: 0.6; }
.contact-line .value { font-size: 0.98rem; }
.placeholder-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  background: rgba(232, 163, 61, 0.18);
  color: var(--marigold);
  padding: 2px 8px;
  border-radius: 6px;
  margin-left: 8px;
}

/* ---------------- Footer ---------------- */

.site-footer {
  background: var(--ink);
  color: rgba(246, 240, 228, 0.65);
  padding: 56px 0 32px;
}
.footer-top {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--line-on-ink);
  margin-bottom: 24px;
}
.footer-wordmark { font-family: var(--font-display); font-size: 1.3rem; color: var(--cream-text); margin-bottom: 8px; }
.footer-cols { display: flex; gap: 56px; flex-wrap: wrap; }
.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(246,240,228,0.5);
  margin-bottom: 12px;
}
.footer-col a { display: block; padding: 5px 0; font-size: 0.92rem; color: rgba(246,240,228,0.8); }
.footer-col a:hover { color: var(--marigold); }
.footer-bottom { display: flex; justify-content: space-between; font-size: 0.82rem; flex-wrap: wrap; gap: 8px; }

/* ---------------- Misc utility ---------------- */

.center { text-align: center; }
.mt-0 { margin-top: 0; }
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--ink-soft);
}