@import url('https://fonts.googleapis.com/css2?family=Figtree:wght@300;400;500;600;700&family=Noto+Sans:wght@300;400;500;700&display=swap');

:root {
  color-scheme: dark;
  --bg: #000000;
  --panel: #0B0F14;
  --panel2: #121212;
  --line: #1E2735;
  --ink: #E7EDF4;
  --body: #C9D4E1;
  --dim: #8A95A6;
  --neon: #59E3AE;
  --blue: #6AA9FF;
  --gold: #E7C36A;
  --r: 28px;
  --shadow: 0 18px 44px rgba(0, 0, 0, 0.62);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding-bottom: 92px;
  background: var(--bg);
  color: var(--ink);
  font-family: 'Figtree', 'Noto Sans', system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
}

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

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 2px;
  border-radius: 8px;
}

.mark {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 80;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(18, 18, 18, 0.86);
  color: var(--neon);
  font-size: 20px;
  font-weight: 600;
  text-decoration: none;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  text-shadow: 0 0 10px rgba(89, 227, 174, 0.55);
}

.mark img { width: 26px; height: 26px; border-radius: 8px; }

.main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: clamp(20px, 4vw, 48px);
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 40px);
}

/* ---- hero ---- */
.hero {
  grid-column: 1 / -1;
  position: relative;
  isolation: isolate;
  display: grid;
  place-items: center;
  min-height: 100vh;
  min-height: 100svh;
  margin: 0 calc(-1 * clamp(16px, 4vw, 40px));
  padding: 84px 22px 48px;
  overflow: hidden;
}

.dots {
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image: radial-gradient(rgba(106, 169, 255, 0.24) 1px, transparent 1.4px);
  background-size: 22px 22px;
  -webkit-mask-image: radial-gradient(circle at 50% 46%, #000 18%, transparent 76%);
  mask-image: radial-gradient(circle at 50% 46%, #000 18%, transparent 76%);
  opacity: 0.75;
}

.hero::before {
  content: '';
  position: absolute;
  width: min(76vw, 640px);
  aspect-ratio: 1;
  border-radius: 50%;
  z-index: -1;
  background: radial-gradient(circle, rgba(89, 227, 174, 0.16), rgba(106, 169, 255, 0.08) 42%, transparent 68%);
  filter: blur(6px);
}

.collage { position: absolute; inset: 0; margin: 0; z-index: -1; }

.slot {
  position: absolute;
  overflow: hidden;
  border-radius: var(--r);
  border: 1px solid var(--line);
  background: linear-gradient(155deg, #131A22, #05070A);
  box-shadow: var(--shadow);
}

.slot img { width: 100%; height: 100%; object-fit: cover; opacity: 0.74; }

.slot-a {
  width: min(34vw, 236px);
  aspect-ratio: 3 / 4;
  top: 15%;
  left: -4%;
  transform: rotate(-6deg);
}

.slot-b {
  width: min(30vw, 206px);
  aspect-ratio: 4 / 5;
  bottom: 13%;
  right: -3%;
  transform: rotate(5deg);
}

.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 700px;
  text-align: center;
}

.hero h1 {
  margin: 0 0 14px;
  font-size: clamp(30px, 7vw, 58px);
  line-height: 1.14;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-shadow: 0 0 22px rgba(89, 227, 174, 0.3);
}

.hero-sub {
  margin: 0;
  color: var(--dim);
  letter-spacing: 0.18em;
  font-size: 16px;
}

/* ---- prose ---- */
.prose { min-width: 0; padding-bottom: 40px; }

.prose > section {
  padding: clamp(28px, 4.5vw, 56px) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 72px;
}

.prose > section:first-child {
  border-top: 0;
  padding-top: clamp(32px, 5vw, 66px);
}

.prose small {
  display: block;
  margin-bottom: 0.55em;
  font-size: 0.9rem;
  letter-spacing: 0.2em;
  color: var(--neon);
  text-shadow: 0 0 10px rgba(89, 227, 174, 0.42);
}

.prose h2 {
  margin: 0 0 0.7em;
  font-size: clamp(22px, 3.4vw, 30px);
  line-height: 1.3;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.prose h3 {
  margin: 1.3em 0 0.5em;
  font-size: clamp(19px, 2.6vw, 22px);
  line-height: 1.4;
  font-weight: 600;
}

.prose p {
  margin: 0 0 1.1em;
  max-width: 66ch;
  color: var(--body);
}

.prose ul,
.prose ol {
  margin: 0 0 1.3em;
  padding-left: 1.35em;
  color: var(--body);
  max-width: 66ch;
}

.prose li { margin: 0.4em 0; }

.prose a {
  color: var(--blue);
  text-underline-offset: 3px;
}

.prose strong { color: #FFFFFF; }

.prose blockquote {
  margin: 1.4em 0;
  padding: 14px 20px;
  border-left: 2px solid var(--neon);
  border-radius: 0 18px 18px 0;
  background: var(--panel);
  color: var(--body);
}

.prose blockquote p:last-child { margin-bottom: 0; }

.prose table {
  width: 100%;
  margin: 0 0 1.4em;
  border-collapse: collapse;
  font-size: 16px;
}

.prose th,
.prose td {
  padding: 10px 12px;
  border: 1px solid var(--line);
  text-align: left;
}

.prose th { background: var(--panel2); color: #FFFFFF; }

/* ---- rail ---- */
.rail {
  position: sticky;
  top: 24px;
  align-self: start;
  margin-top: clamp(32px, 5vw, 66px);
  padding: 20px;
  border-radius: var(--r);
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.rail small {
  display: block;
  margin-bottom: 0.35em;
  font-size: 0.9rem;
  letter-spacing: 0.2em;
  color: var(--neon);
}

.rail h2 {
  margin: 0 0 14px;
  font-size: 20px;
  font-weight: 600;
}

.rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.rail-list li + li { margin-top: 6px; }

.rail-list a {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 42px;
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--body);
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease;
}

.rail-list a:hover,
.rail-list a:focus-visible {
  background: #17202B;
  color: #FFFFFF;
}

.idx {
  font-size: 0.85em;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}

/* ---- footer ---- */
.foot {
  max-width: 1180px;
  margin: 64px auto 0;
  padding: 0 clamp(16px, 4vw, 40px) 24px;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: center;
  justify-content: space-between;
  padding: clamp(26px, 5vw, 44px);
  border-radius: var(--r);
  border: 1px solid var(--line);
  background: radial-gradient(120% 150% at 10% 0%, rgba(89, 227, 174, 0.14), transparent 62%), var(--panel);
  box-shadow: var(--shadow);
}

.cta-brand {
  margin: 0;
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 600;
  letter-spacing: 0.03em;
  text-shadow: 0 0 18px rgba(89, 227, 174, 0.32);
}

.pill {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 24px;
  border-radius: 999px;
  background: var(--neon);
  color: #04140E;
  font-weight: 600;
  text-decoration: none;
  transition: filter 0.2s ease;
}

.pill:hover { filter: brightness(1.12); }

.fgrid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  margin: 46px 0 30px;
}

.fgrid dl { margin: 0; }

.fgrid dt {
  margin-bottom: 10px;
  font-size: 0.9rem;
  letter-spacing: 0.2em;
  color: var(--neon);
}

.fgrid dd {
  margin: 0 0 4px;
  color: var(--body);
}

.fgrid dd.dim { color: var(--dim); }

.fgrid a {
  display: inline-block;
  padding: 8px 0;
  color: var(--body);
  text-decoration: none;
}

.fgrid a:hover,
.fgrid a:focus-visible { color: #FFFFFF; }

.base {
  padding-top: 18px;
  border-top: 1px solid var(--line);
  text-align: center;
  color: var(--dim);
}

.base p { margin: 0; }

/* ---- bottom bar ---- */
.bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 70;
  padding: 8px 8px calc(8px + env(safe-area-inset-bottom));
  background: rgba(0, 0, 0, 0.86);
  border-top: 1px solid var(--line);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.bar ol {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 2px 2px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.bar ol::-webkit-scrollbar { display: none; }

.bar li { flex: 0 0 auto; }

.bar a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 0 15px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #0D1218;
  color: var(--body);
  font-size: 16px;
  white-space: nowrap;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.bar a:hover,
.bar a:focus-visible,
.bar a[aria-current='true'] {
  background: var(--neon);
  border-color: var(--neon);
  color: #04140E;
}

/* ---- reveal ---- */
.rv {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.rv.in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .rv { opacity: 1; transform: none; transition: none; }
}

/* ---- narrow ---- */
@media (max-width: 900px) {
  .main {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }

  .rail {
    position: static;
    margin: 8px 0 0;
  }

  .fgrid {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
  }
}

@media (max-width: 520px) {
  body { padding-bottom: 88px; }

  .hero { padding-top: 78px; }

  .slot-a { width: 38vw; top: 12%; left: -8%; }

  .slot-b { width: 34vw; bottom: 10%; right: -7%; }

  .prose > section { padding: 30px 0; }

  .cta { flex-direction: column; align-items: flex-start; }
}

button[aria-expanded]{min-width:44px;min-height:44px}