/* ═══════════════════════════════════════════════════════════
   广中小悠 · 官方站点 v2「星轨学院」
   深夜星空 Hero + 浅色正文；星尘、星座连线与墨色星碑。
   品牌底线不变：岩石黑按钮 + 鸢尾紫点缀，渐变只做光效。
   ═══════════════════════════════════════════════════════════ */

:root {
  --ink: #17161F;
  --ink-hover: #2B2935;
  --ink-rgb: 23, 22, 31;
  --night-1: #12111C;
  --night-2: #1A1830;
  --night-3: #221E42;
  --primary: #6E56CF;
  --primary-rgb: 110, 86, 207;
  --primary-light: #F3F0FE;
  --primary-border: #D9CDF6;
  --grad-title: linear-gradient(92deg, #A18BF2 0%, #C0A9F8 46%, #F7B9CF 100%);
  --text-1: #191826;
  --text-2: #4E4C60;
  --text-3: #918FA6;
  --border: #E4E3EE;
  --bg-page: #F6F6FA;
  --live: #EAB308;
  --mint: #12A594;
  --font: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, Inter, sans-serif;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-card: 0 2px 10px rgba(60, 50, 120, 0.06), 0 1px 3px rgba(60, 50, 120, 0.04);
  --shadow-lift: 0 6px 24px rgba(60, 50, 120, 0.12), 0 2px 6px rgba(60, 50, 120, 0.06);
}

* { 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), 0.22); color: #fff; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
:focus-visible { outline: 2px solid rgba(var(--primary-rgb), 0.7); 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; }

.grad-text { background: var(--grad-title); -webkit-background-clip: text; background-clip: text; color: transparent; }

.progress-hairline { position: fixed; inset: 0 0 auto 0; height: 2px; z-index: 120; pointer-events: none; }
.progress-hairline span { display: block; height: 100%; background: var(--grad-title); transform: scaleX(0); transform-origin: 0 50%; }

/* ── 导航（深色起航 → 滚动后转浅色） ────────────────────── */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  color: #ECEAF8;
  background: rgba(18, 17, 28, 0.55);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  backdrop-filter: blur(16px) saturate(1.4);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: background 0.4s var(--ease), color 0.4s var(--ease), box-shadow 0.4s var(--ease), border-color 0.4s var(--ease);
}
.nav.light {
  color: var(--text-1);
  background: rgba(246, 246, 250, 0.82);
  border-bottom-color: rgba(25, 24, 38, 0.06);
  box-shadow: 0 6px 24px rgba(60, 50, 120, 0.08);
}
.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; padding: 2.5px 10px; border-radius: 999px; letter-spacing: 0.04em; white-space: nowrap; background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.18); }
.nav.light .brand-badge { background: #fff; border-color: var(--border); color: var(--text-2); }

.nav-links { display: flex; gap: 4px; margin-left: auto; }
.nav-links a { font-size: 13.5px; padding: 7px 13px; border-radius: 999px; transition: color 0.2s, background 0.25s var(--ease); }
.nav-links a:hover { background: rgba(255, 255, 255, 0.1); }
.nav.light .nav-links a:hover { color: var(--text-1); background: rgba(var(--primary-rgb), 0.08); }
.nav-links a.is-active { color: #C9B8FA; background: rgba(161, 139, 242, 0.16); }
.nav.light .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 ──────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 8px; position: relative; overflow: hidden;
  border: none; cursor: pointer; 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-lg { font-size: 15.5px; padding: 14px 26px; border-radius: 14px; }
.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; }
.btn::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:hover::after { left: 128%; }

/* 夜航按钮：岩石黑 + 发光描边 */
.btn-night { background: var(--ink); color: #fff; border: 1px solid rgba(255,255,255,0.26); box-shadow: 0 0 0 1px rgba(255,255,255,0.05), 0 10px 30px -8px rgba(139, 124, 240, 0.5); }
.btn-night:hover { background: #262437; transform: translateY(-1.5px); box-shadow: 0 0 0 1px rgba(255,255,255,0.08), 0 16px 40px -8px rgba(139, 124, 240, 0.7); }

/* 浅色区按钮：标准岩石黑 */
.btn-ink { background: var(--ink); color: #fff; box-shadow: 0 1px 2px rgba(var(--ink-rgb), 0.22), 0 10px 28px -10px rgba(var(--primary-rgb), 0.45); }
.btn-ink:hover { background: var(--ink-hover); transform: translateY(-1.5px); box-shadow: 0 2px 4px rgba(var(--ink-rgb), 0.24), 0 14px 34px -10px rgba(var(--primary-rgb), 0.62); }
.btn-ghost { background: rgba(255, 255, 255, 0.85); 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); box-shadow: var(--shadow-card); }
.btn-ghost-night { background: rgba(255, 255, 255, 0.06); color: #ECEAF8; border: 1px solid rgba(255, 255, 255, 0.26); }
.btn-ghost-night:hover { background: rgba(255, 255, 255, 0.12); transform: translateY(-1.5px); border-color: rgba(255, 255, 255, 0.45); }
.btn-disabled { opacity: 0.55; cursor: not-allowed; background: rgba(255,255,255,.82); border: 1px dashed var(--border); color: var(--text-2); }

/* ── 通用标题元素 ──────────────────────────────────────── */
.eyebrow { display: inline-flex; align-items: center; gap: 9px; font-size: 12.5px; font-weight: 600; letter-spacing: 0.14em; color: var(--primary); }
.sec-idx { font-size: 11px; color: var(--text-3); letter-spacing: 0.1em; border: 1px solid var(--border); border-radius: 5px; padding: 1px 6px; font-variant-numeric: tabular-nums; background:#fff; }
.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(237, 235, 250, 0.55), rgba(246, 246, 250, 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; }
.section-sub { color: var(--text-2); font-size: 15.5px; }
.section-sub b { color: var(--text-1); }

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 · 夜航 ══════════════ */
.hero {
  position: relative; min-height: 100vh;
  display: flex; flex-direction: column;
  padding: 128px 0 56px;
  overflow: clip;
  color: #ECEAF8;
  background:
    radial-gradient(1100px 600px at 82% -10%, rgba(101, 78, 196, 0.35), transparent 65%),
    radial-gradient(900px 560px at 8% 8%, rgba(58, 52, 110, 0.5), transparent 65%),
    linear-gradient(180deg, var(--night-1) 0%, var(--night-2) 58%, var(--night-3) 100%);
}
.hero::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -1px; height: 140px;
  background: linear-gradient(180deg, transparent, var(--bg-page));
  pointer-events: none; z-index: 3;
}

.starfield { position: absolute; inset: 0; }
.shooting-star {
  position: absolute; top: 12%; left: -12%;
  width: 130px; height: 1.6px; border-radius: 2px;
  background: linear-gradient(90deg, rgba(255,255,255,0), rgba(255,255,255,0.85), rgba(185, 166, 248, 0.9));
  transform: rotate(18deg);
  opacity: 0;
  animation: shoot 9.5s var(--ease) infinite;
  animation-delay: 3.2s;
}
@keyframes shoot {
  0% { transform: translate3d(0, 0, 0) rotate(18deg); opacity: 0; }
  3% { opacity: 0.9; }
  9% { transform: translate3d(760px, 240px, 0) rotate(18deg); opacity: 0; }
  100% { transform: translate3d(760px, 240px, 0) rotate(18deg); opacity: 0; }
}

.hero-nebula { position: absolute; inset: 0; pointer-events: none; }
.neb { position: absolute; border-radius: 50%; filter: blur(80px); will-change: transform; }
.neb-a { width: 560px; height: 380px; left: 6%; top: -120px; background: radial-gradient(closest-side, rgba(139, 124, 240, 0.34), transparent 72%); animation: nebDriftA 17s ease-in-out infinite alternate; }
.neb-b { width: 520px; height: 360px; right: 0%; top: 4%; background: radial-gradient(closest-side, rgba(240, 163, 198, 0.20), transparent 72%); animation: nebDriftB 21s ease-in-out infinite alternate; }
@keyframes nebDriftA { from { transform: translate3d(0,0,0) scale(1); } to { transform: translate3d(52px, 30px, 0) scale(1.1); } }
@keyframes nebDriftB { from { transform: translate3d(0,0,0) scale(1.06); } to { transform: translate3d(-46px, 34px, 0) scale(1); } }

.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, 62px); font-weight: 700; line-height: 1.18; letter-spacing: 0.015em; margin: 18px 0 20px; }
.hero-sub { font-size: 16.5px; color: #B9B6D6; max-width: 30em; }
.hero-sub b { color: #fff; }
.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: #B9B6D6; font-size: 13px; }
.hero-trust li { display: inline-flex; align-items: center; gap: 6px; }
.hero-trust .ic { color: #C9B8FA; width: 1em; height: 1em; stroke-width: 2.1; }

/* ── 成员星座 ──────────────────────────────────────────── */
.hero-stage { position: relative; height: 560px; perspective: 1200px; }
.constellation { position: absolute; inset: 0; width: 100%; height: 100%; }
.constellation .cl {
  stroke: rgba(185, 166, 248, 0.55); stroke-width: 1.6; stroke-dasharray: 3 7;
  animation: clFlow 26s linear infinite;
}
@keyframes clFlow { to { stroke-dashoffset: -440; } }
.constellation .cn { fill: #C9B8FA; animation: cnTw 3.2s ease-in-out infinite; animation-delay: var(--tw, 0s); }
.constellation .cn-big { fill: #F7B9CF; }
@keyframes cnTw { 0%, 100% { opacity: 0.35; } 50% { opacity: 1; } }

.stage-card {
  position: absolute;
  background: linear-gradient(180deg, #FFFFFF, #F4F1FD);
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 18px;
  padding: 10px 10px 8px;
  box-shadow: 0 4px 14px rgba(8, 6, 20, 0.35), 0 24px 54px -16px rgba(139, 124, 240, 0.4);
  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), 0.28), 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; }

.task-chip, .rt-mini {
  position: absolute; z-index: 6;
  display: inline-flex; align-items: center; gap: 7px;
  background: rgba(26, 24, 48, 0.72);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 12.5px; font-weight: 600; color: #E8E6F5;
  box-shadow: 0 4px 16px rgba(8, 6, 20, 0.4);
  will-change: transform;
  transform: translate3d(var(--mx, 0px), var(--my, 0px), 0);
  white-space: nowrap;
}
.task-chip .ic { color: #C9B8FA; 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: #fff; }
.rt-mini-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--mint); flex: none; animation: mintPulse 2.4s var(--ease) infinite; }
@keyframes mintPulse { 0% { box-shadow: 0 0 0 0 rgba(18,165,148,.4); } 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: 30px; translate: -50%;
  width: 26px; height: 40px; border-radius: 999px;
  border: 1.6px solid rgba(255, 255, 255, 0.3);
  display: flex; justify-content: center; padding-top: 7px;
  z-index: 4; background: rgba(255, 255, 255, 0.06);
}
.cue-wheel { width: 3.5px; height: 9px; border-radius: 4px; background: #fff; opacity: 0.6; animation: cueDrop 1.8s var(--ease) infinite; }
@keyframes cueDrop { 0% { transform: translateY(0); opacity: 0; } 30% { opacity: 0.9; } 70% { transform: translateY(12px); opacity: 0; } 100% { opacity: 0; } }

/* ── 数据条 · 墨色星碑 ─────────────────────────────────── */
.stats { position: relative; z-index: 4; padding: 0 28px; margin-top: -66px; }
.stats-inner {
  max-width: 1020px; margin: 0 auto;
  background: linear-gradient(180deg, #201D33, #17152A);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 18px;
  box-shadow: 0 24px 50px -18px rgba(20, 16, 46, 0.55);
  display: grid; grid-template-columns: repeat(4, 1fr);
  padding: 26px 12px;
  color: #B9B6D6;
}
.stat { text-align: center; display: flex; flex-direction: column; gap: 2px; }
.stat + .stat { border-left: 1px solid rgba(255, 255, 255, 0.09); }
.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; 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; }
}

/* ── 成员星图 ──────────────────────────────────────────── */
.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: #fff; 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 { position: relative; background: #fff; border: 1px solid var(--border); border-radius: 16px; 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); }
.member-card.hidden { display: none; }
.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;
}
.member-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lift); border-color: rgba(var(--glow), 0.42); }
.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: #F2F1F8; 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; }

/* ── 能力光谱 ──────────────────────────────────────────── */
.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: 16px; 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: #F2F1F8; 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); }

.demo-chat { position: relative; background: linear-gradient(180deg, #FBFAFE, #F3F1FB); 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); }
.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; }

/* ── 圆桌观测（深色观测舱） ────────────────────────────── */
.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-observatory {
  position: relative;
  border-radius: 24px;
  padding: 20px;
  background:
    radial-gradient(600px 320px at 78% 0%, rgba(101, 78, 196, 0.30), transparent 70%),
    radial-gradient(500px 300px at 10% 100%, rgba(58, 52, 110, 0.45), transparent 70%),
    linear-gradient(180deg, var(--night-1), var(--night-2));
  border: 1px solid rgba(255, 255, 255, 0.09);
  box-shadow: 0 30px 60px -24px rgba(20, 16, 46, 0.6);
  overflow: hidden;
}
.rt-observatory::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    radial-gradient(1.4px 1.4px at 12% 22%, rgba(255,255,255,.8), transparent 60%),
    radial-gradient(1.2px 1.2px at 30% 78%, rgba(255,255,255,.55), transparent 60%),
    radial-gradient(1.5px 1.5px at 52% 12%, rgba(201,184,250,.8), transparent 60%),
    radial-gradient(1.1px 1.1px at 72% 58%, rgba(255,255,255,.5), transparent 60%),
    radial-gradient(1.4px 1.4px at 88% 30%, rgba(247,185,207,.75), transparent 60%),
    radial-gradient(1.1px 1.1px at 44% 88%, rgba(255,255,255,.5), transparent 60%);
}
.rt-scene { position: relative; aspect-ratio: 10 / 8.2; max-width: 560px; 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(161, 139, 242, 0.10) 0 2px, transparent 2px 26px),
    radial-gradient(ellipse at 50% 40%, rgba(110, 86, 207, 0.22), transparent 62%),
    linear-gradient(178deg, #2B2750 6%, #221E42 58%, #191633 96%);
  border: 1px solid rgba(185, 166, 248, 0.22);
  box-shadow: inset 0 2px 10px rgba(185, 166, 248, 0.12), 0 24px 50px -18px rgba(8, 6, 20, 0.7);
}
.rt-ring { position: absolute; left: 50%; top: 50%; translate: -50% -50%; border-radius: 50%; border: 1px dashed rgba(185, 166, 248, 0.22); }
.rt-ring-1 { width: 62%; height: 44%; }
.rt-ring-2 { width: 82%; height: 62%; opacity: 0.6; }
.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(161, 139, 242, 0.35), transparent 74%); animation: poolBreath 7.2s var(--ease) infinite; }
@keyframes poolBreath { 0%, 100% { opacity: 0.4; } 50% { opacity: 1; } }

.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), 0.4);
  box-shadow: 0 0 0 3px rgba(var(--glow), 0.14), 0 12px 26px -8px rgba(8, 6, 20, 0.6);
  animation: seatLive 7.2s var(--ease) infinite;
  animation-delay: var(--delay);
}
.rt-seat figcaption {
  margin-top: 7px; text-align: center; position: relative; left: 50%; translate: -50%;
  font-size: 11.5px; font-weight: 600; color: #D9D6EE;
  background: rgba(26, 24, 48, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 999px; padding: 3px 10px;
  white-space: nowrap;
}
@keyframes seatLive {
  0%, 8% { transform: translateY(0); box-shadow: 0 0 0 3px rgba(var(--glow), 0.1), 0 12px 26px -8px rgba(8, 6, 20, 0.6); }
  16%, 42% { transform: translateY(-7px); box-shadow: 0 0 0 4px rgba(var(--glow), 0.4), 0 16px 34px -6px rgba(var(--glow), 0.6); }
  55%, 100% { transform: translateY(0); box-shadow: 0 0 0 3px rgba(var(--glow), 0.1), 0 12px 26px -8px rgba(8, 6, 20, 0.6); }
}
.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: #C9B8FA; border-color: rgba(185, 166, 248, 0.4); }

.rt-ripple { position: absolute; inset: -4%; border-radius: 24%; border: 2px solid rgba(var(--glow), 0.8); 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: 0.85; } 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: rgba(255, 255, 255, 0.92); color: var(--ink);
  font-size: 12px; font-weight: 700; letter-spacing: 0.2em;
  padding: 7px 18px 7px 20px; border-radius: 999px;
  box-shadow: 0 8px 22px -8px rgba(8, 6, 20, 0.6);
}
.rt-status {
  position: absolute; left: 0; top: 0;
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(26, 24, 48, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 999px;
  padding: 8px 15px;
  font-size: 12px; font-weight: 600; color: #D9D6EE;
}
.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,.45); opacity: 1; } 50% { box-shadow: 0 0 0 5px rgba(234,179,8,.1); opacity: 0.75; } }

/* ── 启程三步 ──────────────────────────────────────────── */
.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: 16px; 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; 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); }
.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 ──────────────────────────────────────────────── */
#download { padding-bottom: 110px; }
.dl-wrap { position: relative; border-radius: 24px; overflow: hidden; border: 1px solid rgba(var(--primary-rgb), 0.16); background: linear-gradient(180deg, #FFFFFF 0%, #F4F2FC 100%); box-shadow: var(--shadow-lift); padding: 72px 28px 56px; text-align: center; }
.dl-aurora { position: absolute; inset: 0; pointer-events: none; opacity: 0.8; }
.dl-aurora .neb-a { width: 460px; height: 300px; left: -60px; top: -110px; }
.dl-aurora .neb-b { width: 460px; height: 320px; right: -80px; top: -80px; }
.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), 0.3); 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(--night-1); 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(139, 124, 240, 0.16), transparent 70%),
    radial-gradient(460px 190px at 88% 10%, rgba(240, 163, 198, 0.10), transparent 70%);
  background-image:
    radial-gradient(520px 200px at 12% 0%, rgba(139, 124, 240, 0.16), transparent 70%),
    radial-gradient(460px 190px at 88% 10%, rgba(240, 163, 198, 0.10), transparent 70%),
    radial-gradient(1.3px 1.3px at 22% 44%, rgba(255,255,255,.6), transparent 60%),
    radial-gradient(1.2px 1.2px at 66% 66%, rgba(255,255,255,.45), transparent 60%),
    radial-gradient(1.4px 1.4px at 84% 28%, rgba(201,184,250,.6), transparent 60%);
}
.footer-aurora::after { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 1.5px; background: linear-gradient(90deg, transparent, rgba(161, 139, 242, 0.55), rgba(247, 185, 207, 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: 0 2px 4px rgba(var(--ink-rgb), .24), 0 14px 34px -10px rgba(var(--primary-rgb), .62); 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; }
  .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; }
}