/* Yulgang Lab landing — tokens follow eden-server/patched/DESIGN.md (ink glass, jade, antique gold). */
:root {
  --ink-950: #070a0c;
  --ink-900: #0a0e11;
  --ink-850: #0f1519;
  --ink-800: #141b20;
  --ink-700: #1b252b;
  --ink-600: #243139;
  --line: rgb(255 255 255 / 9%);
  --line-strong: rgb(255 255 255 / 16%);
  --text: #eef1ec;
  --text-2: #b4bfbb;
  --text-3: #8d9a96;
  --jade: #5ccfae;
  --jade-btn: #1a7a65;
  --jade-btn-hover: #21907a;
  --gold: #d6b46a;
  --gold-2: #e7cf94;
  --danger: #ff8a7a;
  --success: #7bd88f;
  --font: "Leelawadee UI", "Noto Sans Thai", "Noto Sans Thai UI", Thonburi, "Segoe UI", Tahoma, sans-serif;
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 14px;
  --e2: 0 8px 24px rgb(0 0 0 / 40%);
  --e3: 0 24px 60px rgb(0 0 0 / 55%), 0 0 0 1px rgb(255 255 255 / 6%);
  --dur: 180ms;
  --ease: cubic-bezier(.2, .7, .2, 1);
  --wrap: 1160px;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--ink-900);
  color: var(--text);
  font: 16px/1.65 var(--font);
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--jade); text-underline-offset: 3px; }
a:hover { color: var(--gold-2); }
b { color: var(--text); font-weight: 700; }
h1, h2, h3 { line-height: 1.3; margin: 0; font-weight: 700; }
p { margin: 0; }
:focus-visible { outline: 2px solid var(--jade); outline-offset: 2px; border-radius: 4px; }

.wrap { width: min(var(--wrap), 100% - 40px); margin-inline: auto; }
.en { display: block; font-size: 12px; letter-spacing: .02em; color: var(--text-2); font-weight: 400; }
.gold { color: var(--gold); }
.muted { color: var(--text-3); }
.center { text-align: center; }
.nw { white-space: nowrap; }

.skip {
  position: absolute; left: 12px; top: -48px; z-index: 20;
  padding: 8px 14px; border-radius: var(--r-sm);
  background: var(--jade-btn); color: #fff;
}
.skip:focus { top: 12px; }

/* ---- buttons ---- */
.btn {
  display: inline-flex; flex-direction: column; align-items: center; justify-content: center;
  min-height: 44px; padding: 8px 20px; border-radius: var(--r-sm);
  font-weight: 700; text-decoration: none; text-align: center; line-height: 1.25;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.btn-primary { background: var(--jade-btn); color: #fff; box-shadow: 0 1px 0 rgb(255 255 255 / 12%) inset, 0 6px 18px rgb(26 122 101 / 35%); }
.btn-primary:hover { background: var(--jade-btn-hover); color: #fff; }
.btn-primary .en { color: rgb(255 255 255 / 82%); }
.btn-ghost { border: 1px solid var(--line-strong); color: var(--text); background: rgb(255 255 255 / 3%); }
.btn-ghost:hover { border-color: var(--gold); color: var(--gold-2); }
.btn-sm { min-height: 40px; padding: 6px 16px; font-size: 15px; }
.btn-xl { min-height: 60px; padding: 10px 30px; font-size: 20px; border-radius: var(--r-md); }

/* ---- top bar ---- */
.topbar {
  position: sticky; top: 0; z-index: 10;
  background: rgb(10 14 17 / 97%);
  border-bottom: 1px solid var(--line);
}
.topbar-inner { display: flex; align-items: center; gap: 24px; min-height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; }
.brand img { border-radius: 8px; }
.brand-name { font-weight: 700; font-size: 18px; letter-spacing: .01em; }
.topnav { display: flex; gap: 22px; margin-left: auto; }
.topnav a { color: var(--text-2); text-decoration: none; font-size: 15px; padding: 10px 0; }
.topnav a:hover { color: var(--gold-2); }

/* ---- hero ---- */
.hero {
  position: relative; overflow: hidden;
  padding: 64px 0 40px;
  background:
    radial-gradient(900px 480px at 85% 10%, rgb(92 207 174 / 10%), transparent 60%),
    radial-gradient(700px 420px at 0% 100%, rgb(214 180 106 / 9%), transparent 60%),
    linear-gradient(180deg, var(--ink-850), var(--ink-900));
  border-bottom: 1px solid var(--line);
}
.hero-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 48px; align-items: center; }
.eyebrow { color: var(--gold); font-size: 12px; letter-spacing: .18em; font-weight: 700; margin-bottom: 12px; font-family: "Segoe UI", var(--font); }
.hero h1 { font-size: clamp(34px, 5vw, 56px); letter-spacing: -.005em; }
.hero h1 .gold { display: inline-block; margin-top: 6px; font-size: .74em; }
.lead { margin-top: 18px; font-size: 18px; color: var(--text-2); max-width: 34em; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 28px; }
.status-pill {
  display: inline-flex; align-items: center; gap: 10px; margin-top: 22px;
  padding: 6px 14px; border-radius: 999px; font-size: 14px; color: var(--text-2);
  background: rgb(255 255 255 / 4%); border: 1px solid var(--line);
}
.dot { width: 9px; height: 9px; border-radius: 50%; background: var(--text-3); flex: none; }
[data-state="online"] .dot { background: var(--success); box-shadow: 0 0 0 4px rgb(123 216 143 / 18%); }
[data-state="maintenance"] .dot { background: var(--gold); }
[data-state="offline"] .dot { background: var(--danger); }

.hero-media { position: relative; padding-bottom: 12%; }
.frame { margin: 0; border-radius: var(--r-lg); overflow: hidden; background: var(--ink-800); box-shadow: var(--e3); }
.frame-desktop { border: 1px solid rgb(214 180 106 / 35%); }
.frame-phone {
  position: absolute; right: -6px; bottom: 0; width: 54%;
  border: 6px solid #05080a; border-radius: 22px;
  box-shadow: var(--e3), 0 0 0 1px rgb(214 180 106 / 40%);
}
.frame-phone img { border-radius: 14px; }

.facts {
  list-style: none; padding: 0; margin-top: 44px;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px;
}
.facts li {
  padding: 14px 18px; border-radius: var(--r-md);
  background: rgb(20 27 32 / 70%); border: 1px solid var(--line);
}
.facts strong { display: block; color: var(--gold); font-size: 22px; }
.facts span { color: var(--text-2); font-size: 14px; }

/* ---- sections ---- */
.section { padding: 88px 0; }
.section-alt { background: var(--ink-850); border-block: 1px solid var(--line); }
.section-head { text-align: center; margin-bottom: 52px; }
.section-head h2 { font-size: clamp(28px, 3.6vw, 40px); }
.section-head h2::after {
  content: ""; display: block; width: 120px; height: 6px; margin: 14px auto 0;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 120 6'%3E%3Cpath d='M0 3 Q60 -1 120 3 Q60 7 0 3Z' fill='%23d6b46a' fill-opacity='.7'/%3E%3C/svg%3E") center / 100% 100% no-repeat;
}
.section-lead { margin-top: 12px; color: var(--text-2); }

/* ---- feature rows ---- */
.feature {
  display: grid; grid-template-columns: 1.15fr 1fr; gap: 56px; align-items: center;
  padding: 36px 0;
}
.feature + .feature, .gallery + .feature, .feature + .gallery { border-top: 1px solid var(--line); }
.feature-flip .feature-media { order: 2; }
.feature-copy h3 { font-size: clamp(22px, 2.4vw, 28px); margin-bottom: 14px; }
.feature-copy p { color: var(--text-2); }
.tag {
  display: inline-block; margin-bottom: 12px; padding: 2px 12px; border-radius: 999px;
  font-size: 13px; font-weight: 700; color: var(--jade); background: rgb(92 207 174 / 12%);
}
.ticks { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 10px; }
.ticks li { position: relative; padding-left: 26px; color: var(--text-2); }
.ticks li::before {
  content: ""; position: absolute; left: 4px; top: .62em; width: 9px; height: 9px;
  transform: rotate(45deg); border: 1.5px solid var(--gold); border-radius: 1px;
}
.shot {
  width: 100%; border-radius: var(--r-md);
  border: 1px solid rgb(214 180 106 / 28%); box-shadow: var(--e2);
  background: var(--ink-800);
}
.media-pair { display: grid; grid-template-columns: .62fr 1fr; gap: 16px; align-items: end; }

/* ---- cities ---- */
.cities { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.city { position: relative; border-radius: var(--r-md); overflow: hidden; border: 1px solid var(--line-strong); background: var(--ink-800); }
.city:first-child { grid-column: 1 / -1; }
.city:first-child img { aspect-ratio: 16 / 7; }
.city img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 16 / 9; }
.city-name {
  position: absolute; inset: auto 0 0 0; padding: 22px 10px 8px;
  background: linear-gradient(transparent, rgb(7 10 12 / 88%));
  font-weight: 700; font-size: 14px; line-height: 1.3;
}
.city-name .en { font-size: 11px; }
.city:first-child .city-name { font-size: 18px; }

/* ---- class gallery (update 27) ---- */
.gallery { padding: 36px 0; }
.gallery-title { text-align: center; font-size: 22px; margin-bottom: 22px; }
.portraits { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
.portrait {
  border-radius: var(--r-md); border: 1px solid rgb(214 180 106 / 30%);
  background: radial-gradient(circle at 50% 35%, rgb(214 180 106 / 14%), transparent 65%), linear-gradient(var(--ink-700), var(--ink-900));
  text-align: center; padding: 8px 8px 12px;
}
.portrait img { margin-inline: auto; aspect-ratio: 2 / 3; object-fit: contain; }
.portrait-name { display: block; font-weight: 700; color: var(--gold); }

/* ---- secondary cards ---- */
.cards { list-style: none; padding: 0; margin: 48px 0 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.card { padding: 22px; border-radius: var(--r-md); background: var(--ink-800); border: 1px solid var(--line); }
.card h3 { font-size: 18px; margin: 12px 0 8px; }
.card p { color: var(--text-2); font-size: 15px; }
.card-icon { width: 34px; height: 34px; fill: none; stroke: var(--gold); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }

/* ---- steps ---- */
.steps { list-style: none; padding: 0; margin: 0 0 40px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; counter-reset: none; }
.step { position: relative; padding: 26px 22px 22px; border-radius: var(--r-md); background: var(--ink-800); border: 1px solid var(--line); }
.step-no {
  display: grid; place-items: center; width: 40px; height: 40px; margin-bottom: 14px;
  border-radius: 50%; border: 1.5px solid var(--gold); color: var(--gold); font-weight: 700; font-size: 18px;
}
.step h3 { font-size: 19px; margin-bottom: 8px; }
.step p { color: var(--text-2); font-size: 15px; }

/* ---- status ---- */
.status-card {
  max-width: 820px; margin-inline: auto; padding: 28px; border-radius: var(--r-lg);
  background: var(--ink-850); border: 1px solid rgb(214 180 106 / 30%); box-shadow: var(--e2);
}
.status-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin: 0; }
.status-grid div { padding: 14px; border-radius: var(--r-md); background: var(--ink-800); border: 1px solid var(--line); }
.status-grid dt { font-size: 13px; color: var(--text-2); }
.status-grid dd { margin: 4px 0 0; font-size: 22px; font-weight: 700; }
[data-status="state"].online { color: var(--success); }
[data-status="state"].maintenance { color: var(--gold); }
[data-status="state"].offline { color: var(--danger); }
.status-note { margin-top: 14px; text-align: center; font-size: 14px; color: var(--text-3); }

/* ---- final CTA + footer ---- */
.cta-band {
  padding: 72px 0; text-align: center;
  background: radial-gradient(600px 260px at 50% 0%, rgb(92 207 174 / 14%), transparent 70%), var(--ink-850);
  border-top: 1px solid var(--line);
}
.cta-inner h2 { font-size: clamp(24px, 3vw, 34px); margin-bottom: 24px; }
.footer { padding: 28px 0 40px; border-top: 1px solid var(--line); background: var(--ink-950); font-size: 14px; color: var(--text-2); }
.footer-inner { display: grid; gap: 6px; }

/* ---- responsive ---- */
@media (max-width: 960px) {
  .hero { padding-top: 40px; }
  .hero-grid, .feature { grid-template-columns: 1fr; gap: 28px; }
  .feature-flip .feature-media { order: 0; }
  .hero-media { max-width: 640px; }
  .facts, .cards, .steps { grid-template-columns: repeat(2, 1fr); }
  .status-grid { grid-template-columns: repeat(2, 1fr); }
  .portraits { grid-template-columns: repeat(3, 1fr); }
  .topnav { display: none; }
  .topbar-inner { justify-content: space-between; }
}
@media (max-width: 560px) {
  body { font-size: 15.5px; }
  .section { padding: 64px 0; }
  .hero-cta .btn { flex: 1 1 100%; }
  .facts { gap: 8px; }
  .facts li { padding: 12px 14px; }
  .facts strong { font-size: 19px; }
  .cards, .steps { grid-template-columns: 1fr; }
  .cities { grid-template-columns: repeat(2, 1fr); }
  .media-pair { grid-template-columns: 1fr; }
  .media-pair .shot-tall { max-width: 300px; margin-inline: auto; }
  .portraits { grid-template-columns: repeat(2, 1fr); }
  .status-card { padding: 18px; }
  .status-grid dd { font-size: 19px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}