/* ====================================================================
   Summit Taekwondo Academy — concept site
   Tokens are semantic (--bg, --text, --accent…) and re-mapped per theme.
   ==================================================================== */

:root{
  /* raw palette */
  --ink:        #14171c;
  --ink-soft:   #1b1f26;
  --ink-line:   rgba(238,240,236,0.14);
  --paper:      #eef0ec;
  --paper-soft: #e2e5de;
  --paper-line: rgba(20,23,28,0.12);
  --red:        #c8102e;
  --red-dim:    #8f0c22;
  --blue:       #0b3d78;
  --gold:       #b08d3e;

  /* type */
  --font-display: Georgia, "Iowan Old Style", "Noto Serif", "Times New Roman", serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --fs-eyebrow: 0.78rem;
  --fs-body: 1.0625rem;
  --fs-lead: clamp(1.125rem, 1.02rem + 0.4vw, 1.3rem);
  --fs-h3: clamp(1.15rem, 1rem + 0.6vw, 1.4rem);
  --fs-h2: clamp(1.9rem, 1.4rem + 2vw, 2.85rem);
  --fs-h1: clamp(2.6rem, 1.7rem + 5vw, 5.2rem);
  --fs-quote: clamp(1.2rem, 1.05rem + 0.8vw, 1.55rem);

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.25rem;
  --space-5: 3.5rem;
  --space-6: 5.5rem;
  --space-7: 8rem;

  --radius-sm: 3px;
  --radius-pill: 999px;
  --max: 1180px;

  --ease: cubic-bezier(.22,.61,.36,1);

  /* semantic — light default */
  --bg: var(--paper);
  --bg-elevated: var(--paper-soft);
  --text: #1b1e1a;
  --text-muted: rgba(27,30,26,0.66);
  --border: var(--paper-line);
  --accent: var(--red);
  --accent-2: var(--blue);
  --on-accent: var(--paper);
  --nav-bg: rgba(238,240,236,0.86);
}

@media (prefers-color-scheme: dark){
  :root{
    --bg: var(--ink);
    --bg-elevated: var(--ink-soft);
    --text: var(--paper);
    --text-muted: rgba(238,240,236,0.66);
    --border: var(--ink-line);
    --accent: var(--red);
    --accent-2: #4d7fc4;
    --on-accent: var(--paper);
    --nav-bg: rgba(20,23,28,0.82);
  }
}
:root[data-theme="dark"]{
  --bg: var(--ink);
  --bg-elevated: var(--ink-soft);
  --text: var(--paper);
  --text-muted: rgba(238,240,236,0.66);
  --border: var(--ink-line);
  --accent: var(--red);
  --accent-2: #4d7fc4;
  --on-accent: var(--paper);
  --nav-bg: rgba(20,23,28,0.82);
}
:root[data-theme="light"]{
  --bg: var(--paper);
  --bg-elevated: var(--paper-soft);
  --text: #1b1e1a;
  --text-muted: rgba(27,30,26,0.66);
  --border: var(--paper-line);
  --accent: var(--red);
  --accent-2: var(--blue);
  --on-accent: var(--paper);
  --nav-bg: rgba(238,240,236,0.86);
}

*,*::before,*::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *,*::before,*::after{ animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

body{
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background .3s var(--ease), color .3s var(--ease);
}

h1,h2,h3{ font-family: var(--font-display); font-weight: 700; margin: 0; text-wrap: balance; }
p{ margin: 0; }
ul,ol{ margin: 0; padding: 0; list-style: none; }
a{ color: inherit; text-decoration: none; }
button{ font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
table{ border-collapse: collapse; }

.wrap{ max-width: var(--max); margin: 0 auto; padding: 0 var(--space-3); }

.skip-link{
  position: absolute; left: -999px; top: 0;
  background: var(--accent); color: var(--on-accent);
  padding: 0.75rem 1.25rem; z-index: 200;
}
.skip-link:focus{ left: var(--space-3); top: var(--space-2); }

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

/* ---------- Nav ---------- */
.site-nav{
  position: sticky; top: 0; z-index: 100;
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease);
}
.site-nav.is-scrolled{ border-bottom-color: var(--border); }
/* backdrop-filter lives on a pseudo-element, not .site-nav itself, because
   filter/backdrop-filter on an ancestor redefines the containing block for
   any position:fixed descendant (the mobile nav drawer) — putting it here
   keeps the fixed drawer anchored to the viewport instead of the navbar. */
.site-nav::before{
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: var(--nav-bg);
  backdrop-filter: saturate(140%) blur(10px);
}
.nav-inner{
  display: flex; align-items: center; justify-content: space-between;
  padding-top: var(--space-2); padding-bottom: var(--space-2);
}
.wordmark{ display: flex; align-items: baseline; gap: 0.5rem; }
.wordmark-en{
  font-family: var(--font-body); font-weight: 800; letter-spacing: 0.06em;
  font-size: 1.05rem;
}
.wordmark-kr{
  font-family: var(--font-display); font-style: italic; color: var(--accent);
  font-size: 0.95rem;
}
.primary-nav{ display: flex; align-items: center; gap: var(--space-4); }
.primary-nav a{
  font-size: 0.92rem; font-weight: 500; color: var(--text-muted);
  transition: color .2s var(--ease);
}
.primary-nav a:hover{ color: var(--text); }
.nav-cta{
  color: var(--on-accent) !important; background: var(--accent);
  padding: 0.55rem 1.1rem; border-radius: var(--radius-pill);
  font-weight: 700 !important;
}
.nav-toggle{
  display: none; flex-direction: column; gap: 5px; padding: 0.5rem;
}
.nav-toggle span{ width: 22px; height: 2px; background: var(--text); display: block; transition: transform .25s var(--ease), opacity .25s var(--ease); }
.nav-toggle[aria-expanded="true"] span:nth-child(1){ transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2){ opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3){ transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero{
  position: relative; overflow: hidden;
  background: var(--ink); color: var(--paper);
  padding: var(--space-7) 0 var(--space-6);
  min-height: 78vh; display: flex; align-items: center;
}
.hero .eyebrow{ color: rgba(238,240,236,0.6); }
.taegeuk{
  position: absolute; right: -8%; top: 50%; transform: translateY(-50%);
  width: min(46vw, 480px); height: min(46vw, 480px);
  opacity: 0.9;
  animation: spin 40s linear infinite;
}
@media (prefers-reduced-motion: reduce){ .taegeuk{ animation: none; } }
@keyframes spin{ to{ transform: translateY(-50%) rotate(360deg); } }
.hero-inner{ position: relative; z-index: 2; max-width: 640px; }
.hero-title{ font-size: var(--fs-h1); line-height: 0.98; margin: var(--space-2) 0 var(--space-3); color: var(--paper); }
.hero-lead{ font-size: var(--fs-lead); color: rgba(238,240,236,0.82); max-width: 46ch; }
.hero-actions{ display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-4); }

.eyebrow{
  font-family: var(--font-body); font-size: var(--fs-eyebrow); font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.14em; color: var(--accent);
  margin: 0 0 var(--space-1);
}

.btn{
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0.85rem 1.6rem; border-radius: var(--radius-pill);
  font-weight: 700; font-size: 0.95rem; transition: transform .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}
.btn:hover{ transform: translateY(-2px); }
.btn-primary{ background: var(--accent); color: var(--on-accent); }
.btn-primary:hover{ background: var(--red-dim); }
.btn-ghost{ border: 1px solid rgba(238,240,236,0.4); color: var(--paper); }
.btn-ghost:hover{ border-color: var(--paper); }
.btn-block{ width: 100%; }

.belt-rule{
  height: 8px;
  border-top: 1px solid rgba(0,0,0,0.25);
  border-bottom: 1px solid rgba(0,0,0,0.25);
  background: linear-gradient(90deg,
    #f5f4f0 0 11.1%, #e8b923 11.1% 22.2%, #e5822a 22.2% 33.3%,
    #2f7a3c 33.3% 44.4%, #1f5fa8 44.4% 55.5%, #6a4c93 55.5% 66.6%,
    #6b4a2b 66.6% 77.7%, #c8102e 77.7% 88.8%, #16161a 88.8% 100%);
}

/* ---------- Sections ---------- */
.section{ padding: var(--space-6) 0; }
.section-alt{ background: var(--bg-elevated); }
.section-head{ max-width: 62ch; margin-bottom: var(--space-5); }
.section-head h2{ font-size: var(--fs-h2); margin-bottom: var(--space-2); }
.section-lead{ font-size: var(--fs-lead); color: var(--text-muted); }

.reveal{ opacity: 0; transform: translateY(18px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
.reveal.is-visible{ opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce){ .reveal{ opacity: 1; transform: none; } }

/* ---------- Tenets ---------- */
.tenets-list{ border-top: 1px solid var(--border); }
.tenet{
  display: grid; grid-template-columns: 3.5rem 1fr;
  gap: var(--space-3); padding: var(--space-3) 0;
  border-bottom: 1px solid var(--border);
}
.tenet-num{ font-family: var(--font-display); font-size: 1.6rem; color: var(--accent); font-style: italic; }
.tenet-body h3{ font-size: var(--fs-h3); margin-bottom: 0.35rem; }
.tenet-kr{ color: var(--text-muted); font-weight: 400; font-size: 0.85em; }
.tenet-body p{ color: var(--text-muted); max-width: 60ch; }

/* ---------- Curriculum board ---------- */
.board{ border-top: 1px solid var(--border); }
.board-row{
  display: grid; grid-template-columns: 1.1fr 0.6fr 2fr 1fr;
  gap: var(--space-3); padding: var(--space-2) 0;
  border-bottom: 1px solid var(--border); align-items: center;
}
.board-head{
  font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--text-muted); font-weight: 700;
}
.board-program{ font-family: var(--font-display); font-weight: 700; font-size: 1.05rem; }
.board-row:not(.board-head) [data-label]{ color: var(--text-muted); }
.board-belts{ display: flex; gap: 0.35rem; }
.dot{ width: 12px; height: 12px; border-radius: 50%; display: inline-block; border: 1px solid var(--border); }
.dot-white{ background:#f5f4f0; } .dot-yellow{ background:#e8b923; } .dot-orange{ background:#e5822a; }
.dot-green{ background:#2f7a3c; } .dot-blue{ background:#1f5fa8; } .dot-purple{ background:#6a4c93; }
.dot-brown{ background:#6b4a2b; } .dot-red{ background:#c8102e; } .dot-black{ background:#16161a; }

/* ---------- Belt strip ---------- */
.belt-strip{ display: flex; flex-wrap: wrap; border-radius: var(--radius-sm); overflow: hidden; }
.belt-seg{
  flex: 1 1 11%; min-width: 90px; background: var(--belt-color); color: var(--belt-text);
  padding: var(--space-3) var(--space-2); text-align: center; cursor: pointer;
  transition: flex-grow .25s var(--ease), filter .2s var(--ease);
  border-right: 1px solid rgba(0,0,0,0.15);
}
.belt-seg:last-child{ border-right: none; }
.belt-seg:hover, .belt-seg:focus-visible, .belt-seg.is-active{ flex-grow: 1.8; filter: brightness(1.08); }
.belt-name{ font-weight: 700; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.06em; }
.belt-detail{
  margin-top: var(--space-3); min-height: 2.6em; color: var(--text-muted);
  font-size: var(--fs-lead); max-width: 60ch;
}

/* ---------- Roster ---------- */
.roster{ border-top: 1px solid var(--border); }
.roster-row{
  display: flex; gap: var(--space-3); align-items: flex-start;
  padding: var(--space-3) 0; border-bottom: 1px solid var(--border);
}
.avatar{
  flex: none; width: 3.25rem; height: 3.25rem; border-radius: 50%;
  background: var(--accent); color: var(--on-accent);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-weight: 700; font-size: 1.05rem;
}
.roster-body h3{ font-size: var(--fs-h3); margin-bottom: 0.25rem; }
.rank{ font-family: var(--font-body); font-weight: 500; font-size: 0.75rem; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--text-muted); margin-left: 0.6rem; }
.roster-body p{ color: var(--text-muted); max-width: 60ch; }

/* ---------- Schedule ---------- */
.table-scroll{ overflow-x: auto; border-top: 1px solid var(--border); }
.schedule-table{ width: 100%; min-width: 560px; }
.schedule-table th, .schedule-table td{
  padding: var(--space-2); text-align: left; border-bottom: 1px solid var(--border);
  font-variant-numeric: tabular-nums; font-size: 0.92rem;
}
.schedule-table thead th{
  text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.72rem; color: var(--text-muted);
}
.schedule-table tbody th{ font-weight: 700; }
.schedule-table td{ color: var(--text-muted); }

/* ---------- Testimonials ---------- */
.quote-strip{ display: grid; gap: var(--space-4); grid-template-columns: repeat(3,1fr); }
.quote{ border-top: 3px solid var(--accent); padding-top: var(--space-2); }
.quote p{
  font-family: var(--font-display); font-style: italic; font-size: var(--fs-quote);
  margin-bottom: var(--space-2);
}
.quote cite{ font-style: normal; font-size: 0.85rem; color: var(--text-muted); }

/* ---------- Contact ---------- */
.contact-grid{ display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-6); align-items: start; }
.contact-facts{ margin-top: var(--space-4); display: flex; flex-direction: column; gap: var(--space-2); }
.contact-facts div{ display: flex; flex-direction: column; }
.contact-facts dt{ font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-muted); }
.contact-facts dd{ margin: 0; font-weight: 600; }

.trial-form{ background: var(--bg-elevated); border: 1px solid var(--border); padding: var(--space-4); border-radius: var(--radius-sm); }
.form-row{ display: flex; flex-direction: column; gap: 0.4rem; margin-bottom: var(--space-3); }
.form-row-split{ display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3); }
.form-row-split > div{ display: flex; flex-direction: column; gap: 0.4rem; }
.trial-form label{ font-size: 0.8rem; font-weight: 600; }
.trial-form input, .trial-form select{
  font: inherit; padding: 0.7rem 0.8rem; border: 1px solid var(--border);
  border-radius: var(--radius-sm); background: var(--bg); color: var(--text);
}
.trial-form input:focus, .trial-form select:focus{ outline: 2px solid var(--accent); outline-offset: 1px; }
.form-note{ margin-top: var(--space-2); font-size: 0.78rem; color: var(--text-muted); text-align: center; }
.form-success{ text-align: center; padding: var(--space-4) 0; }
.form-success h3{ font-size: var(--fs-h3); margin-bottom: var(--space-1); }
.form-success p{ color: var(--text-muted); }

/* ---------- Footer ---------- */
.site-footer{ background: var(--ink); color: var(--paper); padding: var(--space-5) 0 var(--space-3); }
.footer-inner{ display: flex; justify-content: space-between; flex-wrap: wrap; gap: var(--space-4); }
.footer-tenets{ margin-top: var(--space-1); font-size: 0.78rem; color: rgba(238,240,236,0.55); }
.footer-links{ display: flex; gap: var(--space-3); flex-wrap: wrap; }
.footer-links a{ color: rgba(238,240,236,0.75); font-size: 0.9rem; }
.footer-links a:hover{ color: var(--paper); }
.footer-fine{ width: 100%; font-size: 0.76rem; color: rgba(238,240,236,0.45); border-top: 1px solid var(--ink-line); padding-top: var(--space-3); margin-top: var(--space-2); }

/* ---------- Responsive ---------- */
@media (max-width: 860px){
  .primary-nav{
    position: fixed; inset: 64px 0 0 0; background: var(--bg);
    flex-direction: column; align-items: flex-start; padding: var(--space-4) var(--space-3);
    transform: translateX(100%); transition: transform .3s var(--ease);
    border-top: 1px solid var(--border); gap: var(--space-3);
  }
  .primary-nav.is-open{ transform: translateX(0); }
  .nav-toggle{ display: flex; }
  .nav-cta{ order: 99; }

  .contact-grid{ grid-template-columns: 1fr; }
  .quote-strip{ grid-template-columns: 1fr; }
  .board-row{ grid-template-columns: 1fr; gap: 0.35rem; }
  .board-head{ display: none; }
  .board-row:not(.board-head) [data-label]::before{
    content: attr(data-label) ": "; font-weight: 700; color: var(--text);
  }
  .taegeuk{ opacity: 0.35; width: 70vw; height: 70vw; right: -20%; }
  .hero{ min-height: auto; padding-top: var(--space-6); }
}