/* =====================================================================
   Nexora Contest — Design System  "Stage & Spotlight"
   Palette derived from the Nexora logo (ink navy + red/blue X),
   champagne gold reserved strictly for awards & certificates.
   ===================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Archivo:wght@500;600;700;800;900&family=Inter:wght@400;500;600;700&family=IBM+Plex+Sans+Thai:wght@400;500;600;700&family=Noto+Sans+SC:wght@400;500;700&display=swap');

:root {
  /* stage */
  --ink:        #0A0D18;
  --ink-2:      #0E1322;
  --surface:    #141B2E;
  --surface-2:  #1B2340;
  --line:       rgba(255,255,255,.09);
  --line-strong:rgba(255,255,255,.16);

  /* text */
  --white:      #F4F6FF;
  --soft:       #C3C9DC;
  --muted:      #838CA8;
  --faint:      #5B6483;

  /* brand */
  --red:        #E63B2E;
  --red-deep:   #B21F16;
  --blue:       #3B7DE6;
  --blue-lit:   #4FB0EE;

  /* awards only */
  --gold:       #D8B978;
  --gold-deep:  #B4914E;
  --gold-glow:  rgba(216,185,120,.28);

  --radius:     14px;
  --radius-lg:  22px;
  --shadow:     0 24px 60px -24px rgba(0,0,0,.7);
  --maxw:       1180px;

  --font-display: 'Archivo', 'Noto Sans SC', 'IBM Plex Sans Thai', sans-serif;
  --font-body:    'Inter', 'Noto Sans SC', 'IBM Plex Sans Thai', system-ui, sans-serif;
}

*,*::before,*::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; font-family: var(--font-body); color: var(--white);
  background: var(--ink); line-height: 1.6; letter-spacing: .1px;
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
:lang(th) { line-height: 1.75; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; }

/* stage backdrop: two spotlights (red-left, blue-right) over deep ink */
body::before {
  content: ""; position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background:
    radial-gradient(900px 520px at 12% -8%, rgba(230,59,46,.16), transparent 60%),
    radial-gradient(880px 520px at 88% -4%, rgba(59,125,230,.18), transparent 62%),
    linear-gradient(180deg, var(--ink) 0%, #070A12 100%);
}
body::after { /* fine grain to kill banding */
  content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none; opacity: .04;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='60'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.wrap { width: min(var(--maxw), 92%); margin-inline: auto; }

/* ---------- typography ---------- */
h1,h2,h3,h4 { font-family: var(--font-display); font-weight: 800; line-height: 1.05; margin: 0; }
.display { font-weight: 900; letter-spacing: -.02em; text-transform: uppercase; }
.eyebrow {
  font-family: var(--font-display); font-weight: 700; font-size: .74rem;
  letter-spacing: .28em; text-transform: uppercase; color: var(--muted);
  display: inline-flex; align-items: center; gap: .7rem;
}
.eyebrow::before { content:""; width: 26px; height: 2px; background: linear-gradient(90deg,var(--red),var(--blue)); }
:lang(zh) .eyebrow, :lang(th) .eyebrow { letter-spacing: .14em; }
.lead { font-size: 1.12rem; color: var(--soft); max-width: 62ch; }
.muted { color: var(--muted); }

/* ---------- X mark signature ---------- */
.xmark { display:inline-block; width: 1em; height: 1em; position: relative; vertical-align: -.12em; }
.xmark i { position:absolute; inset:0; margin:auto; width: 122%; height: 15%; border-radius: 4px; left:-11%; }
.xmark i:first-child { background: linear-gradient(90deg,var(--red),var(--red-deep)); transform: rotate(45deg); }
.xmark i:last-child  { background: linear-gradient(90deg,var(--blue-lit),var(--blue)); transform: rotate(-45deg); }

/* ---------- buttons ---------- */
.btn {
  --bg: var(--white); --fg: var(--ink);
  display: inline-flex; align-items: center; gap: .55rem; justify-content:center;
  padding: .82rem 1.5rem; border-radius: 999px; border: 1px solid transparent;
  font-family: var(--font-display); font-weight: 700; font-size: .92rem; letter-spacing: .02em;
  background: var(--bg); color: var(--fg); transition: transform .18s, box-shadow .18s, background .2s;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { --bg: linear-gradient(100deg, var(--red) 0%, var(--blue) 130%); --fg: #fff;
  box-shadow: 0 14px 30px -12px rgba(230,59,46,.5); }
.btn-primary:hover { box-shadow: 0 20px 40px -12px rgba(59,125,230,.55); }
.btn-ghost { --bg: transparent; --fg: var(--white); border-color: var(--line-strong); }
.btn-ghost:hover { border-color: var(--white); background: rgba(255,255,255,.04); }
.btn-gold { --bg: linear-gradient(100deg,var(--gold),var(--gold-deep)); --fg:#1a1406;
  box-shadow: 0 14px 30px -14px var(--gold-glow); }

/* ---------- header ---------- */
.site-head {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px); background: rgba(10,13,24,.72);
  border-bottom: 1px solid var(--line);
}
.site-head .wrap { display: flex; align-items: center; gap: 1.4rem; height: 68px; }
.brand { display: flex; align-items: center; gap: .6rem; font-family: var(--font-display); font-weight: 900;
  letter-spacing: -.01em; font-size: 1.18rem; text-transform: uppercase; }
.brand .xmark { width: 1.05em; height: 1.05em; }
.brand small { display:block; font-size: .5rem; letter-spacing: .22em; color: var(--muted); font-weight: 600; }
.nav { display: flex; gap: 1.35rem; margin-left: auto; align-items: center; }
.nav a { font-size: .9rem; color: var(--soft); font-weight: 500; }
.nav a:hover { color: var(--white); }
.lang-switch { display: flex; border: 1px solid var(--line-strong); border-radius: 999px; overflow: hidden; }
.lang-switch button { background: transparent; color: var(--muted); border: 0; padding: .3rem .62rem;
  font-size: .78rem; font-weight: 700; font-family: var(--font-display); }
.lang-switch button[aria-pressed="true"] { background: linear-gradient(100deg,var(--red),var(--blue)); color:#fff; }
.hamburger { display: none; background: transparent; border: 0; color: var(--white); font-size: 1.5rem; }

/* ---------- hero ---------- */
.hero { position: relative; padding: clamp(3.5rem, 9vw, 7rem) 0 clamp(3rem,6vw,5rem); }
.hero .wrap { position: relative; z-index: 2; }
.hero-x { /* huge watermark X behind hero */
  position: absolute; z-index: 1; right: -6%; top: 50%; transform: translateY(-50%);
  width: min(560px, 52vw); aspect-ratio: 1; opacity: .5; pointer-events: none;
  filter: blur(.3px);
}
.hero h1 { font-size: clamp(2.6rem, 7.4vw, 5.6rem); }
.hero h1 .line2 { display:block;
  background: linear-gradient(100deg,var(--red) 0%,#fff 42%,var(--blue-lit) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero .lead { margin-top: 1.4rem; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 1.6rem; margin-top: 2.2rem; }
.hero-meta div span { display:block; font-family: var(--font-display); font-weight: 800; font-size: 1.5rem; }
.hero-meta div small { color: var(--muted); font-size: .8rem; letter-spacing: .12em; text-transform: uppercase; }
.hero-cta { display: flex; flex-wrap: wrap; gap: .9rem; margin-top: 2.4rem; }

/* ---------- sections ---------- */
section { padding: clamp(3.4rem, 7vw, 6rem) 0; position: relative; }
.section-head { max-width: 720px; margin-bottom: 2.6rem; }
.section-head h2 { font-size: clamp(1.9rem, 4vw, 3rem); margin-top: .8rem; }
.divider-x { display:flex; align-items:center; gap:1rem; color: var(--faint); margin: 0 0 2rem; }
.divider-x::before,.divider-x::after { content:""; height:1px; flex:1; background: var(--line); }

/* ---------- cards / grids ---------- */
.grid { display: grid; gap: 1.1rem; }
.cols-3 { grid-template-columns: repeat(3,1fr); }
.cols-4 { grid-template-columns: repeat(4,1fr); }
.cols-2 { grid-template-columns: repeat(2,1fr); }

.card {
  background: linear-gradient(180deg, var(--surface), var(--ink-2));
  border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 1.5rem;
  transition: border-color .25s, transform .25s, box-shadow .25s; position: relative; overflow: hidden;
}
.card:hover { border-color: var(--line-strong); transform: translateY(-4px); box-shadow: var(--shadow); }

/* category card */
.cat-card .cat-code { font-family: var(--font-display); font-weight: 900; font-size: .78rem;
  letter-spacing: .2em; color: var(--muted); text-transform: uppercase; }
.cat-card h3 { font-size: 1.55rem; margin: .5rem 0 .4rem; }
.cat-card .fee { margin-top: 1.1rem; font-family: var(--font-display); font-weight: 800; font-size: 1.15rem; }
.cat-card .fee small { color: var(--muted); font-weight: 600; font-size: .78rem; }
.cat-card::after { content:""; position:absolute; left:0; top:0; width: 4px; height: 100%;
  background: linear-gradient(180deg,var(--red),var(--blue)); opacity: .0; transition: opacity .25s; }
.cat-card:hover::after { opacity: 1; }

/* judge card */
.judge-card { text-align: center; }
.judge-card .avatar { width: 96px; height: 96px; border-radius: 50%; margin: 0 auto 1rem;
  background: radial-gradient(circle at 30% 25%, var(--surface-2), var(--ink));
  border: 2px solid var(--line-strong); display:grid; place-items:center;
  font-family: var(--font-display); font-weight:900; font-size:1.8rem; color: var(--soft); }
.judge-card h3 { font-size: 1.25rem; }
.judge-card .cred { display:inline-block; margin-top:.5rem; font-size:.72rem; letter-spacing:.06em;
  color:#1a1406; background: linear-gradient(100deg,var(--gold),var(--gold-deep));
  padding:.2rem .6rem; border-radius: 999px; font-weight: 700; }

/* schedule */
.timeline { border-left: 2px solid var(--line); padding-left: 1.4rem; display: grid; gap: 1.1rem; }
.timeline .slot { position: relative; }
.timeline .slot::before { content:""; position:absolute; left:-1.85rem; top:.45rem; width: 11px; height: 11px;
  border-radius: 50%; background: var(--blue-lit); box-shadow: 0 0 0 4px rgba(59,125,230,.18); }
.slot time { font-family: var(--font-display); font-weight: 800; font-size: .95rem; color: var(--blue-lit); }
.slot h4 { font-size: 1.12rem; margin: .2rem 0; }

/* winners */
.podium { display: grid; grid-template-columns: repeat(3,1fr); gap: 1rem; align-items: end; }
.winner { border-radius: var(--radius-lg); padding: 1.4rem; text-align: center;
  border: 1px solid var(--line); background: linear-gradient(180deg,var(--surface),var(--ink-2)); }
.winner.gold { border-color: var(--gold-deep); box-shadow: 0 0 0 1px var(--gold-glow), 0 20px 50px -24px var(--gold-glow); }
.winner .medal { font-family: var(--font-display); font-weight:900; font-size: 2.2rem;
  background: linear-gradient(100deg,var(--gold),#fff); -webkit-background-clip:text; background-clip:text; color:transparent; }
.winner.silver .medal { background: linear-gradient(100deg,#cfd6e6,#fff); -webkit-background-clip:text; background-clip:text; color:transparent; }
.winner.bronze .medal { background: linear-gradient(100deg,#d69a6a,#fff); -webkit-background-clip:text; background-clip:text; color:transparent; }
.winner h3 { font-size: 1.3rem; margin: .4rem 0 .2rem; }

/* sponsors */
.sponsor-row { display:flex; flex-wrap:wrap; gap: .9rem; }
.sponsor-chip { border:1px solid var(--line); border-radius: 999px; padding:.7rem 1.3rem;
  display:flex; align-items:center; gap:.6rem; background: var(--surface); font-weight:600; color: var(--soft); }
.sponsor-chip .tier { font-size:.66rem; letter-spacing:.12em; text-transform:uppercase; color: var(--gold); font-weight:700; }

/* faq */
.faq details { border:1px solid var(--line); border-radius: var(--radius); padding: 1.1rem 1.3rem; background: var(--surface); }
.faq details + details { margin-top: .8rem; }
.faq summary { font-family: var(--font-display); font-weight: 700; font-size: 1.05rem; cursor: pointer; list-style: none; display:flex; justify-content: space-between; gap:1rem; }
.faq summary::after { content:"+"; color: var(--blue-lit); font-size: 1.4rem; line-height: 1; }
.faq details[open] summary::after { content:"–"; }
.faq p { color: var(--soft); margin: .8rem 0 0; }

/* ---------- forms ---------- */
.field { margin-bottom: 1.1rem; }
.field label { display:block; font-size: .82rem; font-weight: 600; color: var(--soft); margin-bottom: .4rem; letter-spacing:.02em; }
.field input, .field select, .field textarea {
  width: 100%; padding: .82rem 1rem; border-radius: var(--radius); border: 1px solid var(--line-strong);
  background: var(--ink-2); color: var(--white); font: inherit; transition: border-color .2s, box-shadow .2s;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px rgba(59,125,230,.2);
}
.check-grid { display:grid; grid-template-columns: repeat(2,1fr); gap: .7rem; }
.check {
  display:flex; align-items:center; gap:.7rem; border:1px solid var(--line-strong); border-radius: var(--radius);
  padding: .8rem 1rem; cursor:pointer; transition: border-color .2s, background .2s;
}
.check:hover { border-color: var(--line-strong); background: rgba(255,255,255,.03); }
.check input { width: 18px; height: 18px; accent-color: var(--red); }
.check.on { border-color: var(--blue); background: rgba(59,125,230,.08); }
.check .fee { margin-left:auto; font-family: var(--font-display); font-weight: 800; color: var(--soft); }

/* ---------- certificate verify ---------- */
.verify-card { max-width: 560px; margin: 0 auto; }
.seal { width: 128px; height: 128px; margin: 0 auto 1.5rem; position: relative; display:grid; place-items:center; }
.seal .ring { position:absolute; inset:0; border-radius:50%; border: 2px solid var(--gold-deep);
  box-shadow: inset 0 0 0 6px rgba(216,185,120,.14), 0 0 40px -6px var(--gold-glow); }
.seal .xmark { width: 54px; height: 54px; }
.result-valid { border-color: var(--gold-deep) !important; box-shadow: 0 0 0 1px var(--gold-glow), var(--shadow); }
.badge { display:inline-flex; align-items:center; gap:.5rem; font-family: var(--font-display); font-weight:800;
  padding:.4rem .9rem; border-radius:999px; font-size:.82rem; letter-spacing:.04em; }
.badge.ok  { background: linear-gradient(100deg,var(--gold),var(--gold-deep)); color:#1a1406; }
.badge.bad { background: rgba(230,59,46,.14); color: #ff9a90; border:1px solid rgba(230,59,46,.4); }
.cert-row { display:flex; justify-content:space-between; gap:1rem; padding:.75rem 0; border-bottom:1px solid var(--line); }
.cert-row span:first-child { color: var(--muted); font-size:.85rem; }
.cert-row span:last-child { font-weight:600; text-align:right; }

/* ---------- toast / notice ---------- */
.notice { border-radius: var(--radius); padding: 1rem 1.2rem; border:1px solid var(--line-strong); background: var(--surface); }
.notice.success { border-color: var(--gold-deep); background: rgba(216,185,120,.08); }
.notice.error { border-color: rgba(230,59,46,.5); background: rgba(230,59,46,.08); }

/* ---------- footer ---------- */
.site-foot { border-top: 1px solid var(--line); padding: 3rem 0 2rem; margin-top: 2rem; color: var(--muted); }
.site-foot .wrap { display:flex; flex-wrap:wrap; gap: 2rem; justify-content: space-between; }
.site-foot a { color: var(--soft); font-size: .9rem; }
.site-foot a:hover { color: var(--white); }
.foot-cols { display:flex; gap: 3rem; flex-wrap:wrap; }
.foot-col h5 { font-family: var(--font-display); font-size:.78rem; letter-spacing:.16em; text-transform:uppercase; color: var(--muted); margin: 0 0 .8rem; }
.foot-col a { display:block; margin-bottom:.5rem; }

/* ---------- utilities ---------- */
.center { text-align: center; }
.mt-1{margin-top:.6rem}.mt-2{margin-top:1.2rem}.mt-3{margin-top:2rem}.mb-2{margin-bottom:1.2rem}
.hidden { display: none !important; }
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }
.pill { display:inline-block; font-size:.72rem; font-weight:700; letter-spacing:.08em; text-transform:uppercase;
  padding:.25rem .7rem; border-radius:999px; border:1px solid var(--line-strong); color: var(--soft); }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .cols-3,.cols-4 { grid-template-columns: repeat(2,1fr); }
  .nav { position: fixed; inset: 68px 0 auto 0; flex-direction: column; background: rgba(10,13,24,.97);
    padding: 1.2rem 6%; gap: 1rem; border-bottom: 1px solid var(--line); transform: translateY(-140%); transition: transform .3s; }
  .nav.open { transform: none; }
  .nav a { font-size: 1.05rem; }
  .hamburger { display: block; margin-left: auto; }
  .lang-switch { margin-left: 0; }
  .podium { grid-template-columns: 1fr; }
  .check-grid { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .cols-3,.cols-4,.cols-2 { grid-template-columns: 1fr; }
  .hero-x { opacity: .28; right: -20%; }
}
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto; }
  .reveal { transition: none; opacity: 1; transform: none; }
  .btn:hover, .card:hover { transform: none; }
}