/* ═══════════════════════════════════════════════════════════
   广中小悠 · 官方站点样式
   设计体系与桌面端 Design Spec V3「鸢尾晨雾」同源：
   浅色纯净基调 + 深岩黑墨色按钮 + 鸢尾紫点缀 + 蓝紫粉环境光晕
   渐变只作为光效与标题重点字，永不作为按钮/实心底色
   ═══════════════════════════════════════════════════════════ */

:root {
  /* 与 theme.css 同源 token */
  --ink: #17161F;
  --ink-hover: #2B2935;
  --ink-rgb: 23, 22, 31;
  --primary: #6E56CF;
  --primary-deep: #654DC4;
  --primary-rgb: 110, 86, 207;
  --primary-light: #F3F0FE;
  --primary-border: #D9CDF6;
  --grad-title: linear-gradient(92deg, #6E56CF 0%, #9B7BF4 48%, #F0A3C6 100%);
  --text-1: #0F172A;
  --text-2: #475569;
  --text-3: #94A3B8;
  --border: #E2E8F0;
  --bg-page: #F8FAFC;
  --live: #EAB308;
  --mint: #12A594;
  --rose: #E5484D;

  --radius-card: 16px;
  --radius-panel: 12px;
  --shadow-card: 0 2px 10px rgba(80, 63, 165, 0.045), 0 1px 3px rgba(80, 63, 165, 0.03);
  --shadow-lift: 0 6px 24px rgba(80, 63, 165, 0.10), 0 2px 6px rgba(80, 63, 165, 0.06);
  --shadow-ink: 0 1px 2px rgba(var(--ink-rgb), 0.22), 0 10px 28px -10px rgba(var(--primary-rgb), 0.45);
  --shadow-ink-hover: 0 2px 4px rgba(var(--ink-rgb), 0.24), 0 14px 34px -10px rgba(var(--primary-rgb), 0.62);
  --ease: cubic-bezier(0.16, 1, 0.3, 1);

  --font: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, Inter, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg-page);
  color: var(--text-1);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: rgba(var(--primary-rgb), 0.16); color: var(--text-1); }

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

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

:focus-visible { outline: 2px solid rgba(var(--primary-rgb), 0.65); outline-offset: 2px; border-radius: 6px; }

section { scroll-margin-top: 84px; }

.ic { width: 1.15em; height: 1.15em; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; flex: none; }
.ic-lg { width: 1.6em; height: 1.6em; }

/* ── 渐变重点字（唯一渐变文字用法） ─────────────────────── */
.grad-text {
  background: var(--grad-title);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ── 顶部滚动进度线 ────────────────────────────────────── */
.progress-hairline { position: fixed; inset: 0 0 auto 0; height: 2px; z-index: 120; pointer-events: none; }
.progress-hairline span {
  display: block; height: 100%; width: 100%;
  background: var(--grad-title);
  transform: scaleX(0); transform-origin: 0 50%;
}

/* ── 导航 ──────────────────────────────────────────────── */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  background: rgba(248, 250, 252, 0.72);
  -webkit-backdrop-filter: blur(16px) saturate(1.5);
  backdrop-filter: blur(16px) saturate(1.5);
  border-bottom: 1px solid rgba(15, 23, 42, 0.055);
  transition: box-shadow 0.35s var(--ease), background 0.35s var(--ease);
}
.nav.scrolled { background: rgba(248, 250, 252, 0.88); box-shadow: 0 6px 24px rgba(80, 63, 165, 0.07); }

.nav-inner {
  max-width: 1180px; margin: 0 auto; padding: 0 28px;
  height: 62px; display: flex; align-items: center; gap: 28px;
}

.brand { display: flex; align-items: center; gap: 10px; flex: none; }
.brand-emblem { width: 28px; height: 28px; }
.brand-name { font-size: 17px; font-weight: 700; letter-spacing: 0.02em; }
.brand-badge {
  font-size: 11px; color: var(--text-2);
  background: #fff; border: 1px solid var(--border); border-radius: 999px;
  padding: 2.5px 10px; letter-spacing: 0.04em; white-space: nowrap;
}

.nav-links { display: flex; gap: 4px; margin-left: auto; }
.nav-links a {
  font-size: 13.5px; color: var(--text-2); padding: 7px 13px; border-radius: 999px;
  transition: color 0.2s, background 0.25s var(--ease);
}
.nav-links a:hover { color: var(--text-1); background: rgba(var(--primary-rgb), 0.07); }
.nav-links a.is-active { color: var(--primary); background: var(--primary-light); }

.btn-nav { margin-left: 4px; }
@media (max-width: 860px) { .brand-badge, .nav-links { display: none; } .btn-nav { margin-left: auto; } }

/* ── 按钮（墨色锚点 + 鸢尾光晕投影，黑而不沉） ─────────── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  border: none; cursor: pointer; position: relative; overflow: hidden;
  font-family: inherit; font-size: 14px; font-weight: 600; letter-spacing: 0.02em;
  padding: 10px 20px; border-radius: 12px;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease),
              background 0.25s var(--ease), border-color 0.25s var(--ease), color 0.25s var(--ease);
}
.btn:active { transform: translateY(0.5px) scale(0.985); }

.btn-ink { background: var(--ink); color: #fff; box-shadow: var(--shadow-ink); }
.btn-ink:hover { background: var(--ink-hover); transform: translateY(-1.5px); box-shadow: var(--shadow-ink-hover); }
.btn-ink::after {
  content: ""; position: absolute; top: 0; bottom: 0; left: -80%; width: 46%;
  background: linear-gradient(105deg, transparent, rgba(255, 255, 255, 0.16), transparent);
  transform: skewX(-18deg); transition: left 0.6s var(--ease); pointer-events: none;
}
.btn-ink:hover::after { left: 128%; }

.btn-ghost { background: rgba(255, 255, 255, 0.82); color: var(--text-1); border: 1px solid var(--border); }
.btn-ghost:hover { transform: translateY(-1.5px); border-color: rgba(var(--primary-rgb), 0.45); color: var(--primary-deep); box-shadow: var(--shadow-card); }

.btn-lg { font-size: 15.5px; padding: 14px 26px; border-radius: 14px; }
.btn-disabled { opacity: 0.55; cursor: not-allowed; background: rgba(255,255,255,.82); border: 1px dashed var(--border); color: var(--text-2); }
.btn-meta { font-size: 11px; font-weight: 500; opacity: 0.62; border-left: 1px solid rgba(255,255,255,.28); padding-left: 9px; margin-left: 3px; }

/* ── 通用 eyebrow / 分节标题 ───────────────────────────── */
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12.5px; font-weight: 600; letter-spacing: 0.14em;
  color: var(--primary);
}
.state-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--primary); flex: none; position: relative; }
.state-dot::after {
  content: ""; position: absolute; inset: -3.5px; border-radius: 50%;
  border: 1.5px solid rgba(var(--primary-rgb), 0.5);
  animation: dotBreath 2.6s var(--ease) infinite;
}
@keyframes dotBreath { 0%, 100% { transform: scale(0.55); opacity: 0; } 45% { transform: scale(1.15); opacity: 1; } 70% { transform: scale(1.3); opacity: 0; } }

.section { max-width: 1180px; margin: 0 auto; padding: 96px 28px 30px; }
.section-tint {
  max-width: none; padding-left: 0; padding-right: 0;
  position: relative;
  padding-bottom: 60px;
  background: linear-gradient(180deg, rgba(243, 240, 254, 0.5), rgba(248, 250, 252, 0) 88%);
}
.section-tint > * { max-width: 1180px; margin-left: auto; margin-right: auto; }
.section-tint .bento, .section-tint .steps, .section-tint .teacher-strip { padding: 0 28px; }

.section-head { text-align: center; max-width: 720px; margin: 0 auto 46px; }
.section-head h2 { font-size: clamp(30px, 4vw, 44px); font-weight: 700; line-height: 1.22; margin: 12px 0 14px; letter-spacing: 0.01em; text-wrap: balance; }
.section-sub { color: var(--text-2); font-size: 15.5px; }
.section-sub b { color: var(--text-1); }

/* ── 滚动揭示 ──────────────────────────────────────────── */
html.js .reveal {
  opacity: 0; transform: translateY(22px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
  transition-delay: var(--d, 0s);
  will-change: opacity, transform;
}
html.js .reveal.in { opacity: 1; transform: none; }

/* ══════════════ HERO ══════════════ */
.hero {
  position: relative; min-height: 100vh;
  display: flex; flex-direction: column;
  padding: 128px 0 40px;
  overflow: clip;
}

.hero-aurora { position: absolute; inset: 0; pointer-events: none; }
.orb { position: absolute; border-radius: 50%; filter: blur(72px); will-change: transform; }
.orb-a {
  width: 620px; height: 420px; left: 8%; top: -140px;
  background: radial-gradient(closest-side, rgba(155, 123, 244, 0.42), transparent 72%);
  animation: orbDriftA 16s ease-in-out infinite alternate;
}
.orb-b {
  width: 520px; height: 400px; right: 2%; top: -60px;
  background: radial-gradient(closest-side, rgba(240, 163, 198, 0.40), transparent 72%);
  animation: orbDriftB 19s ease-in-out infinite alternate;
}
.orb-c {
  width: 560px; height: 420px; left: 34%; top: -170px;
  background: radial-gradient(closest-side, rgba(96, 165, 250, 0.30), transparent 72%);
  animation: orbDriftA 22s ease-in-out infinite alternate-reverse;
}
@keyframes orbDriftA { from { transform: translate3d(0, 0, 0) scale(1); } to { transform: translate3d(60px, 34px, 0) scale(1.08); } }
@keyframes orbDriftB { from { transform: translate3d(0, 0, 0) scale(1.04); } to { transform: translate3d(-52px, 40px, 0) scale(1); } }

.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(var(--primary-rgb), 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(var(--primary-rgb), 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(900px 520px at 50% 0%, rgba(0,0,0,.7), transparent 78%);
  mask-image: radial-gradient(900px 520px at 50% 0%, rgba(0,0,0,.7), transparent 78%);
}

.hero-motes { position: absolute; inset: 0; pointer-events: none; }

.hero-inner {
  position: relative; z-index: 2;
  max-width: 1180px; margin: 0 auto; padding: 0 28px;
  width: 100%;
  display: grid; grid-template-columns: 1.04fr 0.96fr; gap: 30px;
  align-items: center; flex: 1;
}

.hero-copy { padding-top: 12px; }
.hero-title {
  font-size: clamp(40px, 5.2vw, 64px); font-weight: 700;
  line-height: 1.16; letter-spacing: 0.015em;
  margin: 18px 0 20px;
}
.title-sep { margin: 0 0.18em; color: var(--text-3); font-weight: 400; }
.hero-sub { font-size: 16.5px; color: var(--text-2); max-width: 30em; }
.hero-sub b { color: var(--text-1); }

.hero-cta { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin: 30px 0 26px; }

.hero-trust {
  display: flex; flex-wrap: wrap; gap: 8px 22px; list-style: none;
  color: var(--text-2); font-size: 13px;
}
.hero-trust li { display: inline-flex; align-items: center; gap: 6px; }
.hero-trust .ic { color: var(--mint); width: 1em; height: 1em; stroke-width: 2.1; }

/* ── Hero 成员展台 ─────────────────────────────────────── */
.hero-stage { position: relative; height: 560px; perspective: 1200px; }

.stage-orbit {
  position: absolute; left: 50%; top: 50%;
  width: 560px; height: 560px;
  translate: -50% -50%;
  animation: orbitSpin 90s linear infinite;
  opacity: 0.9;
}
@keyframes orbitSpin { to { rotate: 360deg; } }

.stage-floor {
  position: absolute; left: 50%; bottom: 26px;
  width: 420px; height: 56px;
  translate: -50%;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(80, 63, 165, 0.14), rgba(80, 63, 165, 0.05) 58%, transparent 76%);
  filter: blur(6px);
}

.stage-card {
  position: absolute;
  background: linear-gradient(180deg, #ffffff, #F6F3FD);
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 18px;
  padding: 10px 10px 8px;
  box-shadow: 0 2px 10px rgba(80, 63, 165, 0.10), 0 18px 44px -14px rgba(80, 63, 165, 0.22);
  will-change: transform;
  transform: translate3d(var(--mx, 0px), var(--my, 0px), 0);
}
.stage-card::before {
  content: ""; position: absolute; inset: 0; border-radius: inherit;
  background: radial-gradient(120% 62% at 50% -8%, rgba(var(--glow), 0.26), transparent 68%);
  pointer-events: none;
}
.stage-card img {
  width: 100%; aspect-ratio: 1; object-fit: cover;
  border-radius: 12px;
  mix-blend-mode: multiply;
}
.stage-card figcaption {
  text-align: center; font-size: 12px; font-weight: 600; color: var(--text-1);
  padding: 7px 2px 2px; letter-spacing: 0.02em;
  white-space: nowrap;
}

.sc-hero  { width: 208px; left: 50%; top: 47%; translate: -50% -50%; z-index: 5; }
.sc-front { width: 152px; left: 3%;  top: 52%; rotate: -4deg; z-index: 4; }
.sc-back  { width: 138px; left: 10%; top: 9%;  rotate: -6deg; z-index: 3; }
.sc-back2 { width: 136px; right: 12%; top: 7%; rotate: 5deg; z-index: 3; }
.sc-back3 { width: 146px; right: 4%; top: 50%; rotate: 4deg; z-index: 4; }

/* 浮动任务芯片 */
.task-chip, .rt-mini {
  position: absolute; z-index: 6;
  display: inline-flex; align-items: center; gap: 7px;
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 12.5px; font-weight: 600; color: var(--text-2);
  box-shadow: 0 2px 8px rgba(80, 63, 165, 0.10), 0 14px 30px -12px rgba(80, 63, 165, 0.18);
  will-change: transform;
  transform: translate3d(var(--mx, 0px), var(--my, 0px), 0);
  white-space: nowrap;
}
.task-chip .ic { color: var(--primary); width: 1.05em; height: 1.05em; }
.tc-1 { left: 31%; top: 1.5%; }
.tc-2 { right: -1.5%; top: 76%; }
.tc-3 { left: -2.5%; top: 33%; }

.rt-mini { left: 35%; bottom: 3.5%; color: var(--text-1); }
.rt-mini-dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--mint); flex: none;
  box-shadow: 0 0 0 0 rgba(18, 165, 148, 0.4);
  animation: mintPulse 2.4s var(--ease) infinite;
}
@keyframes mintPulse {
  0% { box-shadow: 0 0 0 0 rgba(18, 165, 148, 0.35); }
  60% { box-shadow: 0 0 0 6px rgba(18, 165, 148, 0); }
  100% { box-shadow: 0 0 0 0 rgba(18, 165, 148, 0); }
}

.hero-scrollcue {
  position: absolute; left: 50%; bottom: 26px; translate: -50%;
  width: 26px; height: 40px; border-radius: 999px;
  border: 1.6px solid rgba(var(--ink-rgb), 0.26);
  display: flex; justify-content: center; padding-top: 7px;
  z-index: 3; background: rgba(255,255,255,.5);
}
.cue-wheel { width: 3.5px; height: 9px; border-radius: 4px; background: var(--ink); opacity: .5; animation: cueDrop 1.8s var(--ease) infinite; }
@keyframes cueDrop { 0% { transform: translateY(0); opacity: 0; } 30% { opacity: .8; } 70% { transform: translateY(12px); opacity: 0; } 100% { opacity: 0; } }

/* ── 数据条 ────────────────────────────────────────────── */
.stats { position: relative; z-index: 3; padding: 0 28px; margin-top: -12px; }
.stats-inner {
  max-width: 1020px; margin: 0 auto;
  background: rgba(255, 255, 255, 0.9);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  border: 1px solid var(--border); border-radius: 18px;
  box-shadow: var(--shadow-lift);
  display: grid; grid-template-columns: repeat(4, 1fr);
  padding: 26px 12px;
}
.stat { text-align: center; display: flex; flex-direction: column; gap: 2px; }
.stat + .stat { border-left: 1px solid rgba(226, 232, 240, 0.8); }
.stat-num {
  font-size: 34px; font-weight: 700; line-height: 1.15;
  font-variant-numeric: tabular-nums;
  background: var(--grad-title);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat span { font-size: 12.5px; color: var(--text-2); letter-spacing: 0.05em; }
@media (max-width: 720px) {
  .stats-inner { grid-template-columns: repeat(2, 1fr); gap: 18px 0; }
  .stat:nth-child(3) { border-left: none; }
}

/* ── 成员展台 ──────────────────────────────────────────── */
.filter-bar { display: flex; justify-content: center; gap: 10px; margin-bottom: 34px; flex-wrap: wrap; }
.chip {
  font-family: inherit; font-size: 13.5px; font-weight: 600; cursor: pointer;
  color: var(--text-2); background: #F1F4F9; border: 1px solid var(--border);
  border-radius: 999px; padding: 8px 20px;
  transition: all 0.28s var(--ease);
}
.chip:hover { border-color: rgba(var(--primary-rgb), 0.4); color: var(--text-1); }
.chip.is-active { background: var(--primary-light); border-color: var(--primary-border); color: var(--primary); }

.member-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px;
}
@media (max-width: 1020px) { .member-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 760px) { .member-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 460px) { .member-grid { grid-template-columns: 1fr; } }

.member-card.hidden { display: none; }

.member-card {
  position: relative;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 14px 16px 16px;
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease), border-color 0.4s var(--ease), opacity 0.4s var(--ease);
}
.member-card::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(130% 54% at 50% -6%, rgba(var(--glow), 0.13), transparent 66%),
    radial-gradient(120% 30% at 50% 108%, rgba(var(--glow), 0.05), transparent 62%);
  pointer-events: none;
  transition: opacity 0.4s var(--ease);
}
.member-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lift); border-color: rgba(var(--glow), 0.42); }
.member-card:hover::before { opacity: 1.4; }

.member-bust { position: relative; height: 168px; display: grid; place-items: end center; margin-bottom: 12px; }
.member-bust img {
  width: 86%; aspect-ratio: 1; object-fit: contain;
  mix-blend-mode: multiply;
  transition: transform 0.45s var(--ease);
  -webkit-user-drag: none;
}
.member-card:hover .member-bust img { transform: scale(1.06) translateY(-2px); }

.member-card h3 { font-size: 15.5px; font-weight: 700; letter-spacing: 0.01em; position: relative; }
.member-alias { font-size: 11.5px; font-weight: 600; color: var(--text-3); margin-left: 5px; }
.member-card p {
  position: relative;
  font-size: 12.8px; color: var(--text-2); line-height: 1.62;
  margin: 6px 0 12px; min-height: 42px;
}
.member-foot { display: flex; gap: 6px; position: relative; }
.tag {
  font-size: 11px; font-weight: 600; color: var(--text-2);
  background: #F1F4F9; border: 1px solid var(--border);
  border-radius: 5px; padding: 2.5px 8px; letter-spacing: 0.03em;
}
.tag-soft { color: var(--primary); background: var(--primary-light); border-color: var(--primary-border); }

.member-note { text-align: center; color: var(--text-3); font-size: 13px; margin-top: 34px; }

/* ── 功能亮点 Bento ────────────────────────────────────── */
.bento { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.b-wide { grid-column: span 2; }
.b-wide2 { grid-column: 1 / -1; }
@media (max-width: 920px) {
  .bento { grid-template-columns: 1fr 1fr; }
  .b-wide { grid-column: 1 / -1; }
}
@media (max-width: 620px) {
  .bento { grid-template-columns: 1fr; }
  .b-wide, .b-wide2 { grid-column: auto; }
}

.bento-card {
  position: relative; overflow: hidden;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 26px;
  box-shadow: var(--shadow-card);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}
.bento-card::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(420px 200px at 85% -10%, rgba(var(--primary-rgb), 0.055), transparent 70%);
}
.bento-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lift); }
.bento-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.bento-card p { font-size: 13.8px; color: var(--text-2); }
.bento-copy { max-width: 34em; position: relative; }
.b-wide { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 26px; align-items: center; }
@media (max-width: 920px) { .b-wide { grid-template-columns: 1fr; } }

.bento-icon {
  width: 46px; height: 46px; border-radius: 13px;
  display: grid; place-items: center;
  color: rgb(var(--glow));
  background: rgba(var(--glow), 0.09);
  border: 1px solid rgba(var(--glow), 0.2);
  margin-bottom: 16px;
}
.bento-icon .ic { width: 24px; height: 24px; }

.runtime-badges { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 18px; position: relative; }
.rt-badge {
  font-size: 12.5px; font-weight: 600; color: var(--text-2);
  background: #F1F4F9; border: 1px solid var(--border);
  border-radius: 999px; padding: 6px 14px;
  font-variant-numeric: tabular-nums;
}
.rt-badge-ink { background: var(--ink); color: #fff; border-color: var(--ink); box-shadow: var(--shadow-ink); }

/* 聊天演示迷你图 */
.demo-chat {
  position: relative;
  background: linear-gradient(180deg, #FBFAFE, #F4F1FB);
  border: 1px solid rgba(var(--primary-rgb), 0.14);
  border-radius: 14px;
  padding: 16px;
  display: flex; flex-direction: column; gap: 10px;
}
.chat-line { max-width: 92%; font-size: 12.8px; line-height: 1.55; padding: 8px 12px; border-radius: 12px; }
.chat-user {
  align-self: flex-end;
  background: var(--primary-light);
  border: 1px solid var(--primary-border);
  color: var(--text-1);
  border-bottom-right-radius: 4px;
}
.chat-ai { align-self: flex-start; color: var(--text-1); background: #fff; border: 1px solid var(--border); border-bottom-left-radius: 4px; }
.chat-ai b { color: var(--primary-deep); }

.chat-delegate {
  align-self: flex-start; display: flex; gap: 10px;
  background: #fff; border: 1px solid var(--border);
  border-radius: 12px; padding: 10px 12px;
  box-shadow: var(--shadow-card);
  max-width: 96%;
}
.chat-avatar {
  width: 34px; height: 34px; border-radius: 10px; overflow: hidden; flex: none;
  background: #fff; border: 1px solid rgba(var(--glow), 0.5);
  box-shadow: 0 0 0 2.5px rgba(var(--glow), 0.12);
}
.chat-avatar img { width: 100%; height: 100%; object-fit: cover; mix-blend-mode: multiply; }
.chat-delegate-body { display: flex; flex-direction: column; gap: 3px; font-size: 12px; }
.chat-delegate-body b { color: var(--text-1); font-size: 12.5px; }
.chat-delegate-body > span { color: var(--text-2); }
.chat-tool {
  display: flex; align-items: center; gap: 6px;
  font-size: 11.5px; color: var(--text-2);
  margin-top: 4px;
}
.chat-tool i {
  width: 6px; height: 6px; border-radius: 50%; background: var(--mint); flex: none;
  animation: mintPulse 2.2s var(--ease) infinite;
}

/* ── 圆桌会议 ──────────────────────────────────────────── */
.rt-layout {
  display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 40px; align-items: center;
}
@media (max-width: 920px) { .rt-layout { grid-template-columns: 1fr; gap: 30px; } }

.rt-points { list-style: none; display: flex; flex-direction: column; gap: 10px; margin-top: 22px; }
.rt-points li { display: flex; align-items: center; gap: 10px; color: var(--text-2); font-size: 14.5px; }
.rt-points .ic { color: var(--mint); stroke-width: 2.1; }

.rt-scene {
  position: relative; aspect-ratio: 10 / 8.2;
  max-width: 600px; margin: 0 auto; width: 100%;
}

.rt-table {
  position: absolute; left: 50%; bottom: 12%;
  width: 86%; height: 56%;
  translate: -50%;
  border-radius: 50%;
  background:
    repeating-radial-gradient(ellipse at 50% 46%, rgba(148, 108, 46, 0.05) 0 2px, transparent 2px 24px),
    radial-gradient(ellipse at 50% 42%, rgba(255, 252, 244, 0.9), transparent 62%),
    linear-gradient(178deg, #F9EEDA 6%, #F0DFBC 58%, #E6D0A6 96%);
  box-shadow:
    inset 0 2px 8px rgba(255, 255, 255, 0.85),
    inset 0 -8px 18px rgba(148, 108, 46, 0.18),
    0 20px 44px -16px rgba(80, 63, 165, 0.26),
    0 3px 8px rgba(80, 63, 165, 0.08);
}
.rt-pool {
  position: absolute; left: 50%; top: 46%;
  width: 46%; aspect-ratio: 2.1;
  translate: -50% -50%;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(var(--primary-rgb), 0.20), transparent 74%);
  animation: poolBreath 7.2s var(--ease) infinite;
}
@keyframes poolBreath { 0%, 100% { opacity: 0.45; } 50% { opacity: 0.95; } }

.rt-seat { position: absolute; z-index: 4; }
.rt-seat img {
  width: 100%; aspect-ratio: 1; object-fit: cover;
  border-radius: 22%;
  background: #fff;
  border: 2px solid rgba(var(--glow), 0.35);
  box-shadow: 0 0 0 3px rgba(var(--glow), 0.10), 0 10px 24px -8px rgba(80, 63, 165, 0.25);
  mix-blend-mode: multiply;
  transition: box-shadow 0.5s var(--ease), transform 0.5s var(--ease);
  animation: seatLive 7.2s var(--ease) infinite;
  animation-delay: var(--delay);
}
.rt-seat figcaption {
  margin-top: 7px; text-align: center;
  font-size: 11.5px; font-weight: 600; color: var(--text-2);
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--border);
  border-radius: 999px; padding: 3px 10px;
  white-space: nowrap;
  translate: -50%;
  position: relative; left: 50%;
  box-shadow: 0 2px 6px rgba(80, 63, 165, 0.08);
}
@keyframes seatLive {
  0%, 8% { transform: translateY(0); box-shadow: 0 0 0 3px rgba(var(--glow), 0.08), 0 10px 24px -8px rgba(80, 63, 165, 0.25); }
  16%, 42% { transform: translateY(-7px); box-shadow: 0 0 0 4px rgba(var(--glow), 0.28), 0 16px 30px -8px rgba(var(--glow), 0.45); }
  55%, 100% { transform: translateY(0); box-shadow: 0 0 0 3px rgba(var(--glow), 0.08), 0 10px 24px -8px rgba(80, 63, 165, 0.25); }
}

.rs-back1 { width: 16%; left: 16%; top: 17%; }
.rs-back2 { width: 15%; left: 42.5%; top: 11%; }
.rs-back3 { width: 16%; right: 16%; top: 17%; }
.rs-front { width: 20%; left: 50%; top: 40%; translate: -50%; }
.rs-front figcaption { color: var(--primary-deep); border-color: var(--primary-border); background: var(--primary-light); }

.rt-ripple {
  position: absolute; inset: -4%;
  border-radius: 24%;
  border: 2px solid rgba(var(--glow), 0.75);
  opacity: 0;
  pointer-events: none;
  animation: ringOut 7.2s var(--ease) infinite;
  animation-delay: var(--delay);
}
@keyframes ringOut {
  0%, 13% { transform: scale(0.82); opacity: 0; }
  17% { opacity: 0.8; }
  42% { transform: scale(1.42); opacity: 0; }
  100% { transform: scale(1.42); opacity: 0; }
}

.rt-you {
  position: absolute; z-index: 4;
  left: 50%; bottom: 5%;
  translate: -50%;
  background: var(--ink); color: rgba(255, 255, 255, 0.92);
  font-size: 12px; font-weight: 700; letter-spacing: 0.2em;
  padding: 7px 18px 7px 20px;
  border-radius: 999px;
  box-shadow: var(--shadow-ink);
}

.rt-status {
  position: absolute; left: 0; top: 0;
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 15px;
  font-size: 12px; font-weight: 600; color: var(--text-2);
  box-shadow: 0 2px 8px rgba(80, 63, 165, 0.1), 0 14px 30px -12px rgba(80, 63, 165, 0.16);
}
.rt-status-dot {
  width: 8px; height: 8px; border-radius: 50%; background: var(--live); flex: none;
  animation: liveBreath 1.6s ease-in-out infinite;
}
@keyframes liveBreath { 0%, 100% { box-shadow: 0 0 0 0 rgba(234, 179, 8, 0.4); opacity: 1; } 50% { box-shadow: 0 0 0 5px rgba(234, 179, 8, 0.08); opacity: 0.75; } }

/* ── 上手三步 ──────────────────────────────────────────── */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 820px) { .steps { grid-template-columns: 1fr; } }
.step {
  position: relative; overflow: hidden;
  background: #fff; border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 26px;
  box-shadow: var(--shadow-card);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}
.step:hover { transform: translateY(-4px); box-shadow: var(--shadow-lift); }
.step-no {
  font-size: 44px; font-weight: 700; line-height: 1;
  font-style: normal;
  background: var(--grad-title);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  opacity: 0.9;
  display: block; margin-bottom: 14px;
  font-variant-numeric: tabular-nums;
}
.step h3 { font-size: 16.5px; font-weight: 700; margin-bottom: 8px; }
.step p { font-size: 13.5px; color: var(--text-2); }

.teacher-strip {
  display: flex; gap: 16px; align-items: flex-start;
  background: var(--primary-light);
  border: 1px solid var(--primary-border);
  border-radius: 14px;
  padding: 18px 22px;
  margin-top: 22px;
}
.teacher-strip-icon {
  width: 40px; height: 40px; border-radius: 12px; flex: none;
  display: grid; place-items: center;
  background: #fff; color: var(--primary);
  border: 1px solid var(--primary-border);
  box-shadow: var(--shadow-card);
}
.teacher-strip-icon .ic { width: 20px; height: 20px; }
.teacher-strip p { font-size: 13.5px; color: var(--text-2); }
.teacher-strip b { color: var(--text-1); }

/* ── 下载区 ────────────────────────────────────────────── */
#download { padding-bottom: 110px; }

.dl-wrap {
  position: relative;
  border-radius: 24px;
  overflow: hidden;
  border: 1px solid rgba(var(--primary-rgb), 0.14);
  background: linear-gradient(180deg, #FFFFFF 0%, #F7F5FD 100%);
  box-shadow: var(--shadow-lift);
  padding: 72px 28px 56px;
  text-align: center;
}
.dl-aurora { position: absolute; inset: 0; pointer-events: none; }
.dl-aurora .orb-a { width: 460px; height: 300px; left: -60px; top: -110px; opacity: 0.75; }
.dl-aurora .orb-b { width: 460px; height: 320px; right: -80px; top: -80px; opacity: 0.75; }
.dl-head { position: relative; margin-bottom: 44px; }

.dl-cards {
  position: relative;
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 18px;
  max-width: 860px; margin: 0 auto;
  text-align: left;
}
@media (max-width: 760px) { .dl-cards { grid-template-columns: 1fr; } }

.dl-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 26px;
  box-shadow: var(--shadow-card);
  display: flex; flex-direction: column; gap: 18px;
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}
.dl-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lift); }
.dl-card.is-primary { border-color: rgba(var(--primary-rgb), 0.28); position: relative; }
.dl-card.is-primary::before {
  content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none;
  background: radial-gradient(130% 60% at 50% -8%, rgba(var(--primary-rgb), 0.08), transparent 66%);
}
.dl-card.is-muted { background: rgba(255, 255, 255, 0.66); }

.dl-os { display: flex; align-items: center; gap: 13px; position: relative; }
.dl-os .ic-lg { color: var(--ink); }
.dl-os h3 { font-size: 17px; font-weight: 700; line-height: 1.3; }
.dl-os span { font-size: 12.5px; color: var(--text-3); }

.dl-actions { display: flex; flex-wrap: wrap; gap: 10px; position: relative; }
.dl-meta { font-size: 12px; color: var(--text-3); position: relative; }

.dl-promise {
  position: relative;
  margin-top: 34px;
  color: var(--text-2); font-size: 13px;
  display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 12px;
}
.dl-sep { width: 3px; height: 3px; border-radius: 50%; background: var(--text-3); display: inline-block; }

/* ── 页脚 ──────────────────────────────────────────────── */
.footer {
  position: relative;
  background: var(--ink);
  color: rgba(255, 255, 255, 0.72);
  overflow: hidden;
}
.footer-aurora {
  position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(520px 200px at 12% 0%, rgba(var(--primary-rgb), 0.16), transparent 70%),
    radial-gradient(460px 190px at 88% 10%, rgba(240, 163, 198, 0.10), transparent 70%);
}
.footer-aurora::after {
  content: ""; position: absolute; left: 0; right: 0; top: 0; height: 1.5px;
  background: linear-gradient(90deg, transparent, rgba(155, 123, 244, 0.55), rgba(240, 163, 198, 0.4), transparent);
}
.footer-inner {
  position: relative;
  max-width: 1180px; margin: 0 auto;
  padding: 54px 28px 44px;
  display: flex; flex-wrap: wrap; gap: 30px 40px; align-items: flex-start;
}
.footer-brand { display: flex; gap: 13px; align-items: center; }
.footer-emblem { width: 42px; height: 42px; }
.footer-brand b { color: #fff; font-size: 16.5px; letter-spacing: 0.02em; display: block; }
.footer-brand p { font-size: 12.5px; color: rgba(255, 255, 255, 0.55); margin-top: 2px; }

.footer-links { display: flex; gap: 6px; margin-left: auto; flex-wrap: wrap; }
.footer-links a {
  font-size: 13px; color: rgba(255, 255, 255, 0.66);
  padding: 6px 12px; border-radius: 999px;
  transition: color 0.2s, background 0.25s var(--ease);
}
.footer-links a:hover { color: #fff; background: rgba(255, 255, 255, 0.08); }

.footer-legal { width: 100%; padding-top: 20px; border-top: 1px solid rgba(255, 255, 255, 0.09); }
.footer-legal p { font-size: 12px; color: rgba(255, 255, 255, 0.42); line-height: 1.9; }
.footer-legal a { color: inherit; text-decoration: underline; text-underline-offset: 3px; transition: opacity 0.2s; }
.footer-legal a:hover { opacity: 0.75; }
.footer-versions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.footer-versions a { font-size: 11.5px; color: rgba(255, 255, 255, 0.6); border: 1px solid rgba(255, 255, 255, 0.16); border-radius: 999px; padding: 3px 12px; transition: all 0.25s var(--ease); }
.footer-versions a:hover { color: #fff; border-color: rgba(255, 255, 255, 0.4); background: rgba(255, 255, 255, 0.06); }

/* ── 回到顶部 ──────────────────────────────────── */
.backtop {
  position: fixed; right: 26px; bottom: 26px; z-index: 90;
  width: 44px; height: 44px; border-radius: 50%;
  border: none; cursor: pointer;
  background: var(--ink); color: #fff;
  display: grid; place-items: center;
  box-shadow: var(--shadow-ink);
  opacity: 0; pointer-events: none;
  transform: translateY(14px);
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease), background 0.25s;
}
.backtop.show { opacity: 1; pointer-events: auto; transform: none; }
.backtop:hover { background: var(--ink-hover); }

/* ── 响应式 ────────────────────────────────────────────── */
@media (max-width: 1020px) {
  .hero-inner { grid-template-columns: 1fr; gap: 8px; }
  .hero-copy { text-align: center; padding-top: 4px; }
  .hero-sub { margin: 0 auto; }
  .hero-cta { justify-content: center; }
  .hero-trust { justify-content: center; }
  .hero-stage { height: 480px; max-width: 560px; margin: 0 auto; width: 100%; }
  .hero-scrollcue { display: none; }
}
@media (max-width: 620px) {
  .section { padding: 72px 20px 24px; }
  .hero { padding-top: 108px; }
  .hero-stage { height: 400px; }
  .stage-orbit { width: 420px; height: 420px; }
  .sc-hero { width: 160px; }
  .sc-front, .sc-back3 { width: 116px; }
  .sc-back, .sc-back2 { width: 104px; }
  .tc-1 { left: 50%; translate: -50%; }
  .tc-2, .tc-3 { display: none; }
  .rt-mini { left: 50%; translate: -50%; bottom: 0; }
  .stat-num { font-size: 26px; }
  .dl-wrap { padding: 52px 18px 42px; }
  .btn-lg { font-size: 14px; padding: 13px 20px; }
  .btn-meta { display: none; }
}