/* ===================================================================
   ITF Taekwon-Do Website — Shared Stylesheet
   =================================================================== */

:root {
  --navy: #0b2545;
  --navy-light: #13315c;
  --blue: #134074;
  --accent: #c8102e;       /* taekwon-do red */
  --accent-dark: #9b0c23;
  --gold: #d4a017;
  --bg: #f5f7fa;
  --bg-alt: #eaeef3;
  --card: #ffffff;
  --text: #1d2733;
  --muted: #5b6677;
  --border: #d8dee6;
  --shadow: 0 4px 18px rgba(11, 37, 69, 0.08);
  --radius: 12px;
  --maxw: 1100px;
  --font: "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}

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

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 1.25rem; }

/* ---------- Header / Navigation ---------- */
.site-header {
  background: var(--navy);
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.25);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1.25rem;
  max-width: var(--maxw);
  margin: 0 auto;
  flex-wrap: wrap;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: #fff;
}
.brand:hover { text-decoration: none; }
.brand .logo {
  width: 38px; height: 38px;
  background: var(--accent);
  color: #fff;
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-weight: 900;
  font-size: 0.85rem;
  border: 2px solid #fff;
}
.brand small { display: block; font-weight: 400; font-size: 0.7rem; opacity: 0.8; letter-spacing: 1px; }

.nav-links { display: flex; gap: 0.35rem; list-style: none; margin: 0; padding: 0; flex-wrap: wrap; }
.nav-links a {
  color: #e7ecf3;
  padding: 0.45rem 0.85rem;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: background 0.15s, color 0.15s;
}
.nav-links a:hover { background: var(--navy-light); text-decoration: none; }
.nav-links a.active { background: var(--accent); color: #fff; }

.nav-toggle {
  display: none;
  background: none; border: 2px solid #ffffff55; color: #fff;
  font-size: 1.3rem; border-radius: 6px; cursor: pointer; padding: 0.1rem 0.55rem;
}

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--blue) 60%, var(--accent-dark) 130%);
  color: #fff;
  padding: 4.5rem 1.25rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "태권도";
  position: absolute;
  left: 1rem; bottom: -2.5rem;
  font-size: 11rem;
  opacity: 0.06;
  font-weight: 900;
  pointer-events: none;
}
.hero::after {
  content: "跆拳道";
  position: absolute;
  right: -1rem; bottom: -2.5rem;
  font-size: 11rem;
  opacity: 0.06;
  font-weight: 900;
  pointer-events: none;
}
.hero h1 { font-size: clamp(2rem, 5vw, 3.4rem); margin: 0 0 0.6rem; letter-spacing: 1px; }
.hero p.lead { font-size: clamp(1rem, 2.3vw, 1.35rem); max-width: 720px; margin: 0 auto 1.6rem; opacity: 0.95; }
.hero .kicker {
  display: inline-block;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.3);
  padding: 0.3rem 0.9rem;
  border-radius: 999px;
  font-size: 0.8rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 1.2rem;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff !important;
  padding: 0.7rem 1.5rem;
  border-radius: 8px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: transform 0.12s, background 0.15s;
}
.btn:hover { background: var(--accent-dark); text-decoration: none; transform: translateY(-2px); }
.btn.secondary { background: transparent; border: 2px solid #fff; }
.btn.secondary:hover { background: rgba(255,255,255,0.12); }
.btn-row { display: flex; gap: 0.8rem; justify-content: center; flex-wrap: wrap; }

/* ---------- Sections ---------- */
section { padding: 3rem 0; }
.section-title { text-align: center; margin: 0 0 0.4rem; font-size: clamp(1.6rem, 3.5vw, 2.3rem); color: var(--navy); }
.section-sub { text-align: center; color: var(--muted); max-width: 680px; margin: 0 auto 2.2rem; }
.bg-alt { background: var(--bg-alt); }

/* ---------- Cards grid ---------- */
.grid { display: grid; gap: 1.4rem; }
.grid.cols-3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid.cols-2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.grid.cols-4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: transform 0.15s, box-shadow 0.15s;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 10px 26px rgba(11,37,69,0.14); }
.card h3 { margin-top: 0; color: var(--navy); }
.card .icon { font-size: 2rem; margin-bottom: 0.5rem; }
.card.link-card { display: block; color: inherit; }
.card.link-card:hover { text-decoration: none; }
.card .more { color: var(--accent); font-weight: 700; }

/* ---------- Tenets ---------- */
.tenet { border-left: 5px solid var(--accent); }
.tenet h3 { display: flex; align-items: baseline; gap: 0.5rem; flex-wrap: wrap; }
.tenet .korean { font-size: 0.95rem; color: var(--accent); font-weight: 600; }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; box-shadow: var(--shadow); border-radius: var(--radius); }
table { width: 100%; border-collapse: collapse; background: #fff; min-width: 560px; }
th, td { padding: 0.75rem 1rem; text-align: left; border-bottom: 1px solid var(--border); }
th { background: var(--navy); color: #fff; font-weight: 700; }
tbody tr:nth-child(even) { background: var(--bg-alt); }
tbody tr:hover { background: #fef0f1; }

/* ---------- Belt swatch ---------- */
.belt {
  display: inline-block; width: 46px; height: 16px; border-radius: 3px;
  border: 1px solid #00000033; vertical-align: middle;
}

/* ---------- Pattern cards ---------- */
.pattern-controls {
  display: flex; gap: 0.8rem; flex-wrap: wrap; align-items: center; justify-content: center;
  margin-bottom: 1.8rem;
}
.pattern-controls input, .pattern-controls select {
  padding: 0.6rem 0.9rem; border: 1px solid var(--border); border-radius: 8px; font-size: 1rem; font-family: inherit;
}
.pattern-controls input { min-width: 260px; }
#patternGrid { align-items: stretch; grid-auto-rows: 1fr; }

.pattern-card {
  position: relative;
  overflow: visible;
  padding: 0;
  background: transparent;
  border: 0;
  box-shadow: none;
  perspective: 1400px;
  height: 100%;
}
.pattern-card:hover { transform: none; box-shadow: none; }
.pattern-inner {
  position: relative;
  height: 100%;
  min-height: 100%;
  border-radius: var(--radius);
  transform-style: preserve-3d;
  transition: transform 0.65s cubic-bezier(0.2, 0.7, 0.2, 1);
}
.pattern-card.is-flipped .pattern-inner { transform: rotateY(180deg); }
.pattern-card .num {
  position: absolute; top: 0.7rem; right: 1.2rem;
  font-size: 2.6rem; font-weight: 900; color: var(--accent);
  line-height: 1; opacity: 0.9; text-shadow: 0 1px 0 #fff;
}
.pattern-face {
  height: 100%;
  min-height: 100%;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  background: var(--card);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}
.pattern-front { position: relative; display: flex; flex-direction: column; }
.pattern-back {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  overflow-y: auto;
  background: var(--navy);
  color: #fff;
  transform: rotateY(180deg);
}
.pattern-card h3 { margin: 0 0 0.2rem; }
.pattern-card .hangul { font-weight: 400; color: var(--muted); }
.pattern-back h3, .pattern-back .video-note, .pattern-back .video-source { color: #fff; }
.pattern-card .meta { display: flex; gap: 1.2rem; flex-wrap: wrap; margin: 0.5rem 0 0.8rem; }
.pattern-card .meta span { font-size: 0.85rem; color: var(--muted); }
.pattern-card .meta strong { color: var(--navy); display: block; font-size: 1.1rem; }
.pattern-front .pattern-flip { align-self: flex-start; margin-top: auto; }
.pattern-video-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem; }
.pattern-video-head .btn { flex: 0 0 auto; }
.pattern-video-head .btn.secondary { border-color: rgba(255,255,255,0.7); }
.video-badge { background: var(--gold); color: #4a3500; margin-bottom: 0.4rem; }
.pattern-video {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border-radius: 8px;
  background: #06182e;
  border: 1px solid rgba(255,255,255,0.18);
}
.pattern-video iframe { width: 100%; height: 100%; border: 0; display: block; }
.pattern-video.has-player .video-fallback { display: none; }
.video-fallback {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 700;
  text-align: center;
  padding: 1rem;
}
.video-fallback:hover { color: #fff; }
.video-link { color: #fff; font-weight: 700; text-decoration: underline; text-underline-offset: 3px; }
.video-link:hover { color: #fff; }
.video-source, .video-note { margin: 0; font-size: 0.85rem; opacity: 0.82; }
@media (prefers-reduced-motion: reduce) {
  .pattern-inner { transition: none; }
}
.badge {
  display: inline-block; background: var(--bg-alt); color: var(--navy);
  padding: 0.2rem 0.7rem; border-radius: 999px; font-size: 0.78rem; font-weight: 700;
  margin-bottom: 0.6rem;
}
.group-badge.coloured-belt { background: #fff7d1; color: #594200; border: 1px solid #e3bd3a; }
.group-badge.black-belt { background: #111827; color: #fff; border: 1px solid #000; }
.group-badge.traditional-alternative { background: #edf2f7; color: var(--navy); border: 1px solid #cbd5e1; }
.badge.grade { background: var(--gold); color: #4a3500; }
.belt-badge, .belt-name { display: inline-flex !important; align-items: center; gap: 0.4rem; }
.belt-chip {
  display: inline-block;
  width: 1.45rem;
  height: 0.7rem;
  flex: 0 0 auto;
  border: 1px solid rgba(0,0,0,0.25);
  border-radius: 2px;
  background: #fff;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.45);
}
.belt-yellow-stripe .belt-chip { background: linear-gradient(90deg, #fff 0 42%, #f6d32d 42% 58%, #fff 58%); }
.belt-yellow .belt-chip { background: #f6d32d; }
.belt-green-stripe .belt-chip { background: linear-gradient(90deg, #fff 0 42%, #178a43 42% 58%, #fff 58%); }
.belt-green .belt-chip { background: #178a43; }
.belt-blue-stripe .belt-chip { background: linear-gradient(90deg, #fff 0 42%, #1d4ed8 42% 58%, #fff 58%); }
.belt-blue .belt-chip { background: #1d4ed8; }
.belt-red-stripe .belt-chip { background: linear-gradient(90deg, #fff 0 42%, #c8102e 42% 58%, #fff 58%); }
.belt-red .belt-chip { background: #c8102e; }
.belt-black-stripe .belt-chip { background: linear-gradient(90deg, #fff 0 42%, #111 42% 58%, #fff 58%); }
.belt-black .belt-chip { background: #111; }
.belt-badge.belt-black { background: #111; color: #fff; }
.belt-badge.belt-black-stripe { background: #f2f4f7; color: #111; }
.belt-badge.belt-yellow, .belt-badge.belt-yellow-stripe { background: #fff2a8; color: #4d3900; }
.belt-badge.belt-green, .belt-badge.belt-green-stripe { background: #dff6e8; color: #07552a; }
.belt-badge.belt-blue, .belt-badge.belt-blue-stripe { background: #dbeafe; color: #123a7a; }
.belt-badge.belt-red, .belt-badge.belt-red-stripe { background: #ffe1e6; color: #8d0b20; }

.no-results { text-align: center; color: var(--muted); padding: 2rem; display: none; }

/* ---------- Timeline ---------- */
.timeline { position: relative; max-width: 820px; margin: 0 auto; padding-left: 1rem; }
.timeline::before {
  content: ""; position: absolute; left: 7px; top: 0; bottom: 0; width: 3px; background: var(--border);
}
.tl-item { position: relative; padding: 0 0 1.8rem 2rem; }
.tl-item::before {
  content: ""; position: absolute; left: 0; top: 4px; width: 17px; height: 17px;
  background: var(--accent); border-radius: 50%; border: 3px solid #fff; box-shadow: 0 0 0 2px var(--accent);
}
.tl-item .year { font-weight: 800; color: var(--accent); font-size: 1.1rem; }
.tl-item h4 { margin: 0.1rem 0 0.3rem; color: var(--navy); }
.tl-item p { margin: 0; }

/* ---------- Prose ---------- */
.prose { max-width: 780px; margin: 0 auto; }
.prose h2 { color: var(--navy); margin-top: 2.2rem; }
.prose h3 { color: var(--blue); }
.prose blockquote {
  border-left: 4px solid var(--gold); background: #fff;
  margin: 1.5rem 0; padding: 1rem 1.4rem; border-radius: 0 8px 8px 0; box-shadow: var(--shadow);
  font-style: italic; color: var(--navy);
}
.prose ul, .prose ol { padding-left: 1.3rem; }
.prose li { margin: 0.35rem 0; }

/* ---------- Breadcrumb ---------- */
.breadcrumb { font-size: 0.85rem; color: var(--muted); padding: 1rem 0 0; }
.breadcrumb a { color: var(--blue); }

/* ---------- Page banner (sub pages) ---------- */
.page-banner {
  background: linear-gradient(135deg, var(--navy), var(--blue));
  color: #fff; padding: 2.6rem 1.25rem; text-align: center;
}
.page-banner h1 { margin: 0.2rem 0; font-size: clamp(1.8rem, 4vw, 2.8rem); }
.page-banner p { margin: 0 auto; opacity: 0.9; max-width: 700px; }

/* ---------- Stats ---------- */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px,1fr)); gap: 1rem; text-align: center; }
.stat { background: #fff; border-radius: var(--radius); padding: 1.5rem 1rem; box-shadow: var(--shadow); }
.stat .big { font-size: 2.4rem; font-weight: 900; color: var(--accent); line-height: 1; }
.stat .lbl { color: var(--muted); font-size: 0.9rem; margin-top: 0.4rem; }

/* ---------- Footer ---------- */
.site-footer { background: var(--navy); color: #c3cdda; padding: 2.5rem 1.25rem 1.5rem; margin-top: 2rem; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px,1fr)); gap: 1.5rem; max-width: var(--maxw); margin: 0 auto; }
.footer-grid h4 { color: #fff; margin: 0 0 0.6rem; }
.footer-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-grid a { color: #c3cdda; }
.footer-grid a:hover { color: #fff; }
.footer-bottom { text-align: center; border-top: 1px solid #ffffff22; margin-top: 1.8rem; padding-top: 1rem; font-size: 0.85rem; opacity: 0.8; }

/* ---------- Utilities ---------- */
.text-center { text-align: center; }
.mt-2 { margin-top: 2rem; }
.disclaimer { font-size: 0.8rem; color: var(--muted); font-style: italic; }

/* ---------- Responsive ---------- */
@media (max-width: 760px) {
  .nav-toggle { display: block; }
  .grid.cols-2 { grid-template-columns: 1fr; }
  .pattern-controls input, .pattern-controls select { width: 100%; }
  .pattern-controls input { min-width: 0; }
  .pattern-video-head { flex-direction: column; }
  .pattern-video-head .btn { width: 100%; }
  .nav-links {
    display: none; flex-direction: column; width: 100%; padding-top: 0.6rem;
  }
  .nav-links.open { display: flex; }
  .nav-links a { width: 100%; }
}