:root {
  --ink: #07080a;
  --ink-2: #101218;
  --mist: #e8e2d6;
  --mist-dim: rgba(232, 226, 214, 0.72);
  --seal: #c8392b;
  --seal-soft: rgba(200, 57, 43, 0.85);
  --gold: #c6a35a;
  --gold-dim: rgba(198, 163, 90, 0.45);
  --line: rgba(232, 226, 214, 0.12);
  --font-display: "Ma Shan Zheng", "STKaiti", "KaiTi", cursive;
  --font-body: "Noto Serif SC", "Songti SC", "STSong", serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--mist);
  font-family: var(--font-body);
  background: var(--ink);
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

.ink-veil {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(1200px 700px at 70% -10%, rgba(198, 163, 90, 0.12), transparent 55%),
    radial-gradient(900px 600px at 10% 20%, rgba(200, 57, 43, 0.1), transparent 50%),
    linear-gradient(180deg, #0a0b0e 0%, #07080a 45%, #050507 100%);
}

.ember-drift {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background-image:
    radial-gradient(1.5px 1.5px at 20% 30%, rgba(198, 163, 90, 0.55), transparent),
    radial-gradient(1px 1px at 70% 40%, rgba(232, 226, 214, 0.35), transparent),
    radial-gradient(1.5px 1.5px at 40% 70%, rgba(200, 57, 43, 0.4), transparent),
    radial-gradient(1px 1px at 85% 75%, rgba(198, 163, 90, 0.35), transparent);
  background-size: 100% 100%;
  animation: ember-float 18s ease-in-out infinite alternate;
  opacity: 0.55;
}

@keyframes ember-float {
  from {
    transform: translate3d(0, 0, 0);
  }
  to {
    transform: translate3d(0, -18px, 0);
  }
}

.topbar,
main,
footer {
  position: relative;
  z-index: 2;
}

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 6vw;
  backdrop-filter: blur(10px);
  background: linear-gradient(180deg, rgba(7, 8, 10, 0.85), rgba(7, 8, 10, 0.2));
  border-bottom: 1px solid transparent;
  transition: border-color 0.35s ease, background 0.35s ease;
}

.topbar.is-solid {
  border-bottom-color: var(--line);
  background: rgba(7, 8, 10, 0.9);
}

.brand-mark {
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.topbar nav {
  display: flex;
  gap: 1.6rem;
}

.topbar nav a {
  font-size: 0.92rem;
  color: var(--mist-dim);
  letter-spacing: 0.12em;
  transition: color 0.25s ease;
}

.topbar nav a:hover {
  color: var(--gold);
}

.hero {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 7rem 6vw 5rem;
  position: relative;
  isolation: isolate;
}

.hero-atmosphere {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg, transparent 40%, rgba(7, 8, 10, 0.92) 100%),
    radial-gradient(ellipse 80% 55% at 50% 35%, rgba(198, 163, 90, 0.08), transparent 70%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='1600' height='900' viewBox='0 0 1600 900'%3E%3Cdefs%3E%3ClinearGradient id='g' x1='0' x2='0' y1='0' y2='1'%3E%3Cstop offset='0%25' stop-color='%231a1d24' stop-opacity='0'/%3E%3Cstop offset='100%25' stop-color='%230b0c10' stop-opacity='.85'/%3E%3C/linearGradient%3E%3C/defs%3E%3Cpath d='M0 620 C220 540 380 700 560 610 C760 510 900 680 1120 600 C1280 540 1460 640 1600 580 L1600 900 L0 900 Z' fill='%2311161c'/%3E%3Cpath d='M0 700 C260 640 420 780 680 700 C900 630 1080 760 1320 700 C1460 660 1540 720 1600 700 L1600 900 L0 900 Z' fill='%2308090c'/%3E%3Crect width='1600' height='900' fill='url(%23g)'/%3E%3C/svg%3E")
      center bottom / cover no-repeat;
  transform: scale(1.02);
  animation: mist-breathe 12s ease-in-out infinite alternate;
}

@keyframes mist-breathe {
  from {
    filter: saturate(1) brightness(1);
  }
  to {
    filter: saturate(1.08) brightness(1.06);
  }
}

.hero-copy {
  max-width: 920px;
  text-align: center;
}

.eyebrow {
  margin: 0 0 1.2rem;
  font-size: 0.85rem;
  letter-spacing: 0.42em;
  text-indent: 0.42em;
  color: var(--gold);
  text-transform: uppercase;
}

.brand-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(3.4rem, 10vw, 6.8rem);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: 0.12em;
  text-indent: 0.12em;
  color: var(--mist);
  text-shadow: 0 10px 60px rgba(0, 0, 0, 0.45);
}

.manifesto {
  margin: 1.6rem 0 0;
  font-size: clamp(1.25rem, 3.2vw, 1.85rem);
  font-weight: 500;
  line-height: 1.7;
  letter-spacing: 0.18em;
  color: var(--mist);
}

.support {
  margin: 1.1rem 0 0;
  font-size: 1rem;
  letter-spacing: 0.35em;
  text-indent: 0.35em;
  color: var(--mist-dim);
}

.hero-actions {
  margin-top: 2.6rem;
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-primary,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 10.5rem;
  padding: 0.95rem 1.6rem;
  border-radius: 999px;
  font-size: 0.95rem;
  letter-spacing: 0.18em;
  transition: transform 0.25s ease, background 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--seal) 0%, #9e2a20 100%);
  color: #fff8f2;
  box-shadow: 0 10px 40px rgba(200, 57, 43, 0.28);
}

.btn-primary:hover {
  transform: translateY(-2px);
  background: linear-gradient(135deg, #d64536 0%, var(--seal) 100%);
}

.btn-ghost {
  border: 1px solid var(--gold-dim);
  color: var(--mist);
}

.btn-ghost:hover {
  transform: translateY(-2px);
  border-color: var(--gold);
  color: var(--gold);
}

.section {
  padding: 6.5rem 6vw;
}

.section-inner {
  max-width: 920px;
  margin: 0 auto;
}

.section-kicker {
  margin: 0 0 0.8rem;
  color: var(--gold);
  letter-spacing: 0.4em;
  text-indent: 0.4em;
  font-size: 0.82rem;
}

.section-title {
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 600;
  letter-spacing: 0.12em;
  line-height: 1.35;
}

.section-lead {
  margin: 1.4rem 0 0;
  max-width: 42rem;
  font-size: 1.05rem;
  line-height: 2;
  color: var(--mist-dim);
  letter-spacing: 0.06em;
}

.dao {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(16, 18, 24, 0.65), rgba(7, 8, 10, 0.2));
}

.virtue-list {
  list-style: none;
  margin: 3rem 0 0;
  padding: 0;
}

.virtue {
  display: grid;
  grid-template-columns: 4rem 1fr;
  gap: 1.2rem;
  padding: 1.7rem 0;
  border-top: 1px solid var(--line);
}

.virtue:last-child {
  border-bottom: 1px solid var(--line);
}

.virtue-index {
  font-family: var(--font-display);
  font-size: 1.6rem;
  color: var(--seal-soft);
  line-height: 1.2;
  padding-top: 0.15rem;
}

.virtue h3 {
  margin: 0 0 0.55rem;
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.14em;
}

.virtue p {
  margin: 0;
  color: var(--mist-dim);
  line-height: 1.9;
  letter-spacing: 0.04em;
}

.download-panel {
  text-align: center;
  padding: 3.2rem 1.5rem;
  border: 1px solid var(--line);
  background:
    radial-gradient(500px 220px at 50% 0%, rgba(200, 57, 43, 0.12), transparent 70%),
    linear-gradient(180deg, rgba(16, 18, 24, 0.9), rgba(7, 8, 10, 0.55));
}

.download-panel .section-lead {
  margin-left: auto;
  margin-right: auto;
}

.platform-grid {
  margin: 2.4rem auto 0;
  max-width: 720px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
  text-align: left;
}

.platform-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 1.05rem 1.15rem;
  border: 1px solid var(--line);
  background: rgba(7, 8, 10, 0.45);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.25s ease, transform 0.25s ease, background 0.25s ease;
}

.platform-item.is-available:hover {
  border-color: var(--gold-dim);
  transform: translateY(-2px);
  background: rgba(16, 18, 24, 0.85);
}

.platform-item.is-soon {
  opacity: 0.72;
  cursor: default;
}

.platform-meta {
  min-width: 0;
}

.platform-name {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.platform-blurb {
  margin: 0.35rem 0 0;
  font-size: 0.82rem;
  color: var(--mist-dim);
  letter-spacing: 0.06em;
}

.platform-badge {
  flex-shrink: 0;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  padding: 0.35rem 0.55rem;
  border: 1px solid var(--line);
  color: var(--mist-dim);
}

.platform-item.is-available .platform-badge {
  border-color: rgba(200, 57, 43, 0.45);
  color: #f0d2cb;
  background: rgba(200, 57, 43, 0.16);
}

.download-note {
  margin: 1.35rem 0 0;
  font-size: 0.85rem;
  color: rgba(232, 226, 214, 0.45);
  letter-spacing: 0.06em;
}

@media (max-width: 560px) {
  .platform-grid {
    grid-template-columns: 1fr;
  }
}

.footer {
  padding: 2.5rem 6vw 3rem;
  text-align: center;
  border-top: 1px solid var(--line);
  color: rgba(232, 226, 214, 0.45);
  font-size: 0.86rem;
  letter-spacing: 0.12em;
}

.footer-seal {
  margin: 0.55rem 0 0;
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--gold-dim);
  letter-spacing: 0.2em;
}

/* 工信部 ICP 备案号（政府要求展示，链接到备案查询） */
.footer-icp {
  margin: 0.9rem 0 0;
  font-size: 0.76rem;
  letter-spacing: 0.06em;
}

.footer-icp a {
  color: rgba(232, 226, 214, 0.4);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-icp a:hover {
  color: var(--gold-dim);
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.9s ease, transform 0.9s ease;
}

.reveal.is-in {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 720px) {
  .topbar nav {
    gap: 0.9rem;
  }

  .topbar nav a {
    font-size: 0.78rem;
    letter-spacing: 0.08em;
  }

  .virtue {
    grid-template-columns: 2.6rem 1fr;
  }

  .section {
    padding: 4.5rem 7vw;
  }
}