/* Go TaaS site — brand palette from assets/brand/README.md */

:root {
  --teal-700: #00565c;
  --teal-600: #007f86;
  --teal-500: #0b4f55;
  --teal-100: #cfe9ea;
  --teal-50: #edf7f7;
  --coral-500: #f06445;
  --coral-600: #d2704e;
  --ink-900: #17272b;
  --ink-700: #2f5b60;
  --ink-500: #47595e;
  --ink-400: #6b7f84;
  --line: #d8e4e6;
  --bg: #f6fafa;
  --surface: #ffffff;
  --code-bg: #0b383d;
  --code-fg: #d9f2f3;
  --shadow: 0 1px 2px rgba(23, 39, 43, 0.05), 0 8px 24px rgba(23, 39, 43, 0.06);
  --radius: 14px;
  --font: "Inter", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink-900);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

a { color: var(--teal-600); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; }

/* ---------- decorative background ---------- */
.bg-decor {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(600px 320px at 85% -50px, rgba(0, 127, 134, 0.10), transparent 70%),
    radial-gradient(500px 300px at -60px 30%, rgba(240, 100, 69, 0.07), transparent 70%);
  pointer-events: none;
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(246, 250, 250, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--ink-900);
}
.brand:hover { text-decoration: none; }

.nav { display: flex; gap: 22px; margin-left: 8px; }
.nav a { color: var(--ink-500); font-size: 14.5px; font-weight: 500; }
.nav a:hover { color: var(--teal-600); text-decoration: none; }

.header-actions { margin-left: auto; display: flex; align-items: center; gap: 12px; }

.lang-toggle {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink-700);
  border-radius: 999px;
  padding: 5px 14px;
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: border-color 0.15s, color 0.15s;
}
.lang-toggle:hover { border-color: var(--teal-600); color: var(--teal-600); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 10px;
  padding: 11px 22px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.12s, box-shadow 0.12s, background 0.12s, border-color 0.12s;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-sm { padding: 7px 14px; font-size: 13.5px; border-radius: 8px; }

.btn-primary {
  background: var(--teal-600);
  color: #fff;
  box-shadow: 0 6px 16px rgba(0, 127, 134, 0.25);
}
.btn-primary:hover { background: var(--teal-700); }

.btn-ghost {
  background: var(--surface);
  color: var(--ink-900);
  border-color: var(--line);
}
.btn-ghost:hover { border-color: var(--teal-600); color: var(--teal-600); }

/* ---------- hero ---------- */
.hero { padding: 96px 0 72px; text-align: center; }

.hero-badges { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; margin-bottom: 26px; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-500);
}

.badge-status { color: var(--teal-600); border-color: var(--teal-100); background: var(--teal-50); }
.dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--teal-600);
  box-shadow: 0 0 0 3px rgba(0, 127, 134, 0.15);
}

.hero-title {
  font-size: clamp(38px, 6vw, 62px);
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 22px;
}

.grad {
  background: linear-gradient(92deg, var(--teal-600), var(--teal-600) 55%, var(--coral-500));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  max-width: 720px;
  margin: 0 auto 34px;
  font-size: 18px;
  color: var(--ink-500);
}

.hero-cta { display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }

.hero-meta { display: flex; justify-content: center; gap: 8px; flex-wrap: wrap; margin-top: 30px; }
.hero-meta img { display: block; border-radius: 4px; }

/* ---------- sections ---------- */
.section { padding: 84px 0; }
.section-alt { background: linear-gradient(180deg, rgba(237, 247, 247, 0.55), rgba(237, 247, 247, 0.25)); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.section-head { max-width: 640px; margin: 0 auto 44px; text-align: center; }
.section-head h2 { font-size: 32px; font-weight: 800; letter-spacing: -0.01em; margin: 0 0 10px; }
.section-head p { margin: 0; color: var(--ink-500); font-size: 16.5px; }

/* ---------- features ---------- */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 24px;
  box-shadow: var(--shadow);
  transition: transform 0.15s, border-color 0.15s;
}
.card:hover { transform: translateY(-3px); border-color: var(--teal-100); }

.card h3 { margin: 14px 0 8px; font-size: 17px; font-weight: 700; }
.card p { margin: 0; color: var(--ink-500); font-size: 14.5px; }

.card-icon {
  width: 42px; height: 42px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 11px;
  background: var(--teal-50);
  color: var(--teal-600);
  border: 1px solid var(--teal-100);
}

/* ---------- architecture ---------- */
.arch-layout { display: grid; grid-template-columns: 1.15fr 1fr; gap: 36px; align-items: start; }
.arch-layout > * { min-width: 0; }

.arch-diagram { font-size: 13.5px; }

.arch-box {
  border-radius: var(--radius);
  padding: 16px;
  border: 1px solid var(--line);
}

.arch-external { background: transparent; border: 1px dashed var(--line); display: flex; gap: 12px; }
.arch-external .arch-node { flex: 1; }

.arch-arrow { text-align: center; color: var(--ink-400); font-size: 16px; line-height: 1.4; margin: 2px 0; }

.arch-k8s { background: rgba(255, 255, 255, 0.6); }

.arch-label {
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-400);
  margin-bottom: 10px;
}

.arch-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

.arch-zone {
  border-radius: 11px;
  padding: 12px;
  border: 1px solid var(--line);
  background: var(--surface);
}
.arch-cp { background: var(--teal-50); border-color: var(--teal-100); }
.arch-dp { background: #fdf2ed; border-color: #f0cdbf; }
.arch-store { margin-top: 12px; background: #f5f8f9; }
.arch-store-row { grid-template-columns: repeat(5, 1fr); }

.arch-node {
  border-radius: 8px;
  padding: 8px 10px;
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--ink-700);
  font-weight: 500;
  text-align: center;
  margin-bottom: 8px;
}
.arch-node:last-child { margin-bottom: 0; }

.arch-edge { background: var(--teal-600); border-color: var(--teal-700); color: #fff; }
.arch-core { background: var(--teal-500); border-color: var(--teal-700); color: #fff; }
.arch-svc { background: var(--teal-100); border-color: #9cc7c9; color: var(--teal-500); }
.arch-dpg { background: var(--coral-600); border-color: #c4623f; color: #fff; }
.arch-gpu { background: #faddd1; border-color: #d2704e; color: #71260e; }
.arch-consumer { background: #fff; }

.arch-points { margin: 0; padding-left: 18px; color: var(--ink-500); font-size: 14.5px; }
.arch-points li { margin-bottom: 12px; }
.arch-points li::marker { color: var(--teal-600); }

/* ---------- quick start ---------- */
.qs-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 28px; align-items: start; }
.qs-grid > * { min-width: 0; }

.qs-step { display: flex; gap: 16px; margin-bottom: 26px; }
.qs-step > div { min-width: 0; }
.qs-step:last-child { margin-bottom: 0; }

.qs-num {
  flex: none;
  width: 34px; height: 34px;
  border-radius: 50%;
  background: var(--teal-600);
  color: #fff;
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  font-size: 15px;
  box-shadow: 0 4px 10px rgba(0, 127, 134, 0.3);
}

.qs-step h3 { margin: 4px 0 10px; font-size: 16.5px; }
.qs-note { color: var(--ink-500); font-size: 14px; margin: 10px 0 0; }

.qs-aside h3 { margin: 0 0 12px; font-size: 15.5px; }
.qs-aside h3 + .port-list, .qs-aside h3 + .code-block { margin-top: 0; }
.qs-aside h3:not(:first-child) { margin-top: 22px; }

.port-list { list-style: none; margin: 0 0 8px; padding: 0; font-size: 14px; color: var(--ink-500); }
.port-list li { padding: 6px 0; border-bottom: 1px dashed var(--line); }
.port-list li:last-child { border-bottom: 0; }
.port-list code { color: var(--teal-600); font-weight: 700; }

/* ---------- code ---------- */
.code-block {
  background: var(--code-bg);
  color: var(--code-fg);
  border-radius: 10px;
  padding: 16px 18px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  margin: 0;
}

.usage-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: start; }
.usage-grid > * { min-width: 0; }
.usage-lang { font-size: 15px; margin: 0 0 10px; color: var(--ink-700); }

/* ---------- roadmap ---------- */
.timeline { list-style: none; margin: 0 auto; padding: 0; max-width: 720px; }

.timeline-item { position: relative; padding: 0 0 34px 34px; }
.timeline-item:last-child { padding-bottom: 0; }

.timeline-item::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 20px;
  bottom: -4px;
  width: 2px;
  background: var(--teal-100);
}
.timeline-item:last-child::before { display: none; }

.timeline-dot {
  position: absolute;
  left: 0;
  top: 5px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--surface);
  border: 4px solid var(--teal-600);
}

.timeline-body h3 { margin: 0 0 6px; font-size: 17px; }
.timeline-body p { margin: 0; color: var(--ink-500); font-size: 14.5px; }

/* ---------- CTA ---------- */
.cta-section { padding: 96px 0; }
.cta-inner { text-align: center; }
.cta-inner h2 { font-size: 32px; font-weight: 800; margin: 0 0 12px; letter-spacing: -0.01em; }
.cta-inner p { color: var(--ink-500); margin: 0 0 28px; font-size: 16.5px; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--line); background: var(--surface); padding: 34px 0; }

.footer-inner { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }

.footer-brand { display: flex; align-items: center; gap: 9px; font-weight: 700; }

.footer-nav { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-nav a { color: var(--ink-500); font-size: 14px; }
.footer-nav a:hover { color: var(--teal-600); }

.footer-copy { margin-left: auto; color: var(--ink-400); font-size: 13.5px; }

/* ---------- responsive ---------- */
@media (max-width: 960px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .arch-layout { grid-template-columns: 1fr; }
  .qs-grid { grid-template-columns: 1fr; }
  .usage-grid { grid-template-columns: 1fr; }
  .nav { display: none; }
}

@media (max-width: 620px) {
  .features-grid { grid-template-columns: 1fr; }
  .arch-row { grid-template-columns: 1fr; }
  .arch-store-row { grid-template-columns: repeat(2, 1fr); }
  .hero { padding: 64px 0 48px; }
  .section { padding: 60px 0; }
  .footer-copy { margin-left: 0; width: 100%; }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn, .card { transition: none; }
  .btn:hover { transform: none; }
  .card:hover { transform: none; }
}