/* ═══════════════════════════════════════════════════════════
   广中小悠 · v4「晨光操场」
   晨光渐变 + 低饱和糖果色块 + 弹跳动效；面向初中生的活力版。
   品牌底线不变：岩石黑按钮；糖果色只做底色块，不做按钮渐变。
   ═══════════════════════════════════════════════════════════ */

:root {
  --ink: #17161F;
  --ink-hover: #2B2935;
  --ink-rgb: 23, 22, 31;
  --primary: #6E56CF;
  --primary-rgb: 110, 86, 207;
  --primary-light: #F3F0FE;
  --primary-border: #D9CDF6;
  --text-1: #0F172A;
  --text-2: #475569;
  --text-3: #94A3B8;
  --border: #E2E8F0;
  --bg-page: #FFFDF9;
  --mint: #12A594;
  --live: #EAB308;

  /* 低饱和糖果色块 */
  --sky: #EAF4FF;
  --mint-bg: #E9F7F1;
  --butter: #FFF6DE;
  --rose: #FDEFF2;
  --lilac: #F3F0FE;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --radius: 22px;
  --font: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, Inter, sans-serif;
  --shadow-card: 0 2px 10px rgba(80, 63, 165, 0.05), 0 1px 3px rgba(80, 63, 165, 0.04);
  --shadow-lift: 0 8px 26px rgba(80, 63, 165, 0.12), 0 3px 8px rgba(80, 63, 165, 0.07);
  --shadow-ink: 0 3px 0 rgba(var(--ink-rgb), 0.9), 0 12px 30px -10px rgba(var(--ink-rgb), 0.35);
}

* { 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: 8px; }
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; }

.progress-hairline { position: fixed; inset: 0 0 auto 0; height: 3px; z-index: 120; pointer-events: none; }
.progress-hairline span { display: block; height: 100%; background: var(--ink); transform: scaleX(0); transform-origin: 0 50%; }

/* ── 导航 ──────────────────────────────────────────────── */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  background: rgba(255, 253, 249, 0.8);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  backdrop-filter: blur(16px) saturate(1.4);
  border-bottom: 1px solid rgba(15, 23, 42, 0.06);
  transition: box-shadow 0.35s var(--ease);
}
.nav.scrolled { box-shadow: 0 8px 26px rgba(80, 63, 165, 0.09); }
.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: 800; 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; font-weight: 600; color: var(--text-2); padding: 7px 13px; border-radius: 999px; transition: color 0.2s, background 0.25s var(--spring); }
.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：岩石黑 · 糖果按压感 ─────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 8px; position: relative;
  border: none; cursor: pointer; font-family: inherit; font-size: 14px; font-weight: 700; letter-spacing: 0.02em;
  padding: 11px 21px; border-radius: 16px;
  transition: transform 0.35s var(--spring), box-shadow 0.35s var(--spring), background 0.25s var(--ease), border-color 0.25s var(--ease), color 0.25s var(--ease);
}
.btn:hover { transform: translateY(-2px) rotate(-0.5deg); }
.btn:active { transform: translateY(1.5px); }
.btn-lg { font-size: 15.5px; padding: 15px 27px; border-radius: 18px; }
.btn-meta { font-size: 11px; font-weight: 600; opacity: 0.62; border-left: 1px solid rgba(255,255,255,.3); padding-left: 9px; margin-left: 3px; }

.btn-ink { background: var(--ink); color: #fff; box-shadow: var(--shadow-ink); }
.btn-ink:hover { background: var(--ink-hover); box-shadow: 0 5px 0 rgba(var(--ink-rgb), 0.9), 0 18px 40px -10px rgba(var(--ink-rgb), 0.4); }
.btn-ghost { background: #fff; color: var(--text-1); border: 1.6px solid var(--border); }
.btn-ghost:hover { transform: translateY(-2px) rotate(0.5deg); border-color: var(--ink); box-shadow: var(--shadow-card); }
.btn-disabled { opacity: 0.55; cursor: not-allowed; background: #fff; border: 1.6px dashed var(--border); color: var(--text-2); transform: none; }

/* ── 通用标题元素 ──────────────────────────────────────── */
.eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: 12.5px; font-weight: 700; letter-spacing: 0.14em; color: var(--primary); }
.state-dot { width: 8px; height: 8px; 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; } }

/* 手绘感荧光笔高亮 */
.hl { position: relative; white-space: nowrap; }
.hl::after { content: ""; position: absolute; left: -2%; right: -2%; bottom: 0.06em; height: 0.34em; z-index: -1; border-radius: 4px; }
.hl-sky::after { background: var(--sky); }
.hl-mint::after { background: var(--mint-bg); }
.hl-butter::after { background: var(--butter); }
.hl-rose::after { background: var(--rose); }
.hl-lilac::after { background: var(--lilac); }

.section { max-width: 1180px; margin: 0 auto; padding: 96px 28px 30px; }
.band { max-width: none; padding-left: 0; padding-right: 0; position: relative; padding-bottom: 64px; }
.band-mint { background: linear-gradient(180deg, var(--mint-bg), rgba(255, 253, 249, 0) 86%); }
.band-sky { background: linear-gradient(180deg, var(--sky), rgba(255, 253, 249, 0) 86%); }
.band > * { max-width: 1180px; margin-left: auto; margin-right: auto; }
.band .bento, .band .steps, .band .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: 800; line-height: 1.24; 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(28px) scale(0.985); transition: opacity 0.55s var(--ease), transform 0.6s var(--spring); transition-delay: var(--d, 0s); will-change: opacity, transform; }
html.js .reveal.in { opacity: 1; transform: none; }

/* ══════════════ HERO · 晨光 ══════════════ */
.hero { position: relative; padding: 140px 0 30px; overflow: clip; text-align: center; }
.hero-dawn { position: absolute; inset: 0; pointer-events: none; }
.blob { position: absolute; border-radius: 50%; filter: blur(52px); will-change: transform; }
.blob-a { width: 480px; height: 360px; left: -8%; top: -80px; background: radial-gradient(closest-side, rgba(255, 205, 160, 0.5), transparent 72%); animation: blobA 16s ease-in-out infinite alternate; }
.blob-b { width: 460px; height: 340px; right: -6%; top: -60px; background: radial-gradient(closest-side, rgba(150, 200, 250, 0.42), transparent 72%); animation: blobB 19s ease-in-out infinite alternate; }
.blob-c { width: 420px; height: 320px; left: 30%; top: -120px; background: radial-gradient(closest-side, rgba(203, 176, 250, 0.4), transparent 72%); animation: blobA 22s ease-in-out infinite alternate-reverse; }
.blob-d { width: 520px; height: 300px; left: 24%; bottom: -60px; background: radial-gradient(closest-side, rgba(255, 230, 170, 0.4), transparent 72%); animation: blobB 18s ease-in-out infinite alternate; }
@keyframes blobA { from { transform: translate3d(0,0,0) scale(1); } to { transform: translate3d(46px, 26px, 0) scale(1.08); } }
@keyframes blobB { from { transform: translate3d(0,0,0) scale(1.05); } to { transform: translate3d(-40px, 30px, 0) scale(1); } }

.sun {
  position: absolute; left: 50%; top: 34px; translate: -50%;
  width: 210px; height: 210px; border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 214, 140, 0.55), rgba(255, 214, 140, 0.18) 55%, transparent 74%);
  animation: sunBreath 7s ease-in-out infinite;
}
@keyframes sunBreath { 0%, 100% { transform: scale(1); opacity: 0.9; } 50% { transform: scale(1.07); opacity: 1; } }

/* 漂浮晨光环 */
.bubble { position: absolute; border-radius: 50%; opacity: 0.75; }
.bb-1 { width: 34px; height: 34px; left: 12%; top: 30%; background: var(--rose); animation: floatY 6s ease-in-out infinite; }
.bb-2 { width: 22px; height: 22px; left: 20%; top: 58%; background: var(--butter); animation: floatY 7.4s ease-in-out infinite 1s; }
.bb-3 { width: 30px; height: 30px; right: 12%; top: 26%; background: var(--sky); animation: floatY 6.6s ease-in-out infinite 0.5s; }
.bb-4 { width: 18px; height: 18px; right: 20%; top: 56%; background: var(--mint-bg); animation: floatY 8s ease-in-out infinite 1.6s; }
@keyframes floatY { 0%, 100% { transform: translateY(0) scale(1); } 50% { transform: translateY(-18px) scale(1.08); } }

.hero-inner { position: relative; max-width: 1180px; margin: 0 auto; padding: 0 28px; }
.hero-title { font-size: clamp(42px, 5.6vw, 68px); font-weight: 800; line-height: 1.16; letter-spacing: 0.01em; margin: 16px 0 18px; }
.squiggle { position: relative; }
.squiggle::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -0.12em; height: 0.18em;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='6' viewBox='0 0 24 6'%3E%3Cpath d='M0 3 Q 3 0 6 3 T 12 3 T 18 3 T 24 3' fill='none' stroke='%236E56CF' stroke-width='2.2' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: repeat-x; background-size: 24px 6px;
}
.hero-sub { font-size: 16.5px; color: var(--text-2); max-width: 34em; margin: 0 auto; }
.hero-sub b { color: var(--text-1); }
.hero-cta { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 14px; margin: 30px 0 24px; }
.hero-trust { display: flex; flex-wrap: wrap; gap: 8px 22px; list-style: none; color: var(--text-2); font-size: 13px; justify-content: center; }
.hero-trust li { display: inline-flex; align-items: center; gap: 6px; }
.hero-trust .ic { color: var(--mint); width: 1em; height: 1em; stroke-width: 2.2; }

/* ── 操场站队 ──────────────────────────────────────────── */
.hero-lineup { position: relative; max-width: 860px; height: 300px; margin: 40px auto 0; }
.lineup-arc { position: absolute; inset: auto 0 0 0; width: 100%; height: 240px; }
.lineup-card {
  position: absolute; bottom: 34px;
  background: linear-gradient(180deg, #ffffff, #FBF8FF);
  border: 1.6px solid #fff;
  border-radius: 20px;
  padding: 9px 9px 6px;
  box-shadow: 0 3px 10px rgba(80, 63, 165, 0.1), 0 20px 40px -14px rgba(80, 63, 165, 0.24);
  will-change: transform;
  transform: rotate(var(--rot, 0deg));
  transition: transform 0.45s var(--spring), box-shadow 0.45s var(--spring);
}
.lineup-card::before { content: ""; position: absolute; inset: 0; border-radius: inherit; background: radial-gradient(120% 60% at 50% -8%, rgba(var(--glow), 0.24), transparent 68%); pointer-events: none; }
.lineup-card:hover { transform: rotate(0deg) translateY(-8px) scale(1.03); box-shadow: 0 8px 18px rgba(80, 63, 165, 0.14), 0 28px 54px -16px rgba(var(--glow), 0.4); z-index: 6; }
.lineup-card img { width: 100%; aspect-ratio: 1; object-fit: cover; border-radius: 14px; mix-blend-mode: multiply; }
.lineup-card figcaption { text-align: center; font-size: 12px; font-weight: 700; color: var(--text-1); padding: 7px 2px 3px; white-space: nowrap; }
.lc-hero { width: 196px; left: 50%; translate: -50%; bottom: 44px; --rot: 0deg; z-index: 5; animation: heroBob 5.6s ease-in-out infinite; }
.lc-1 { width: 132px; left: 7%; bottom: 118px; --rot: -5deg; z-index: 3; }
.lc-2 { width: 142px; left: 24%; bottom: 74px; --rot: -2.5deg; z-index: 4; }
.lc-3 { width: 142px; right: 24%; bottom: 74px; --rot: 2.5deg; z-index: 4; }
.lc-4 { width: 132px; right: 7%; bottom: 118px; --rot: 5deg; z-index: 3; }
@keyframes heroBob { 0%, 100% { translate: -50% 0; } 50% { translate: -50% -9px; } }

.hero-wave { position: relative; display: block; width: 100%; height: 80px; margin-top: 8px; }

/* ── 数据条 ────────────────────────────────────────────── */
.stats { padding: 6px 28px 0; }
.stats-inner {
  max-width: 1020px; margin: 0 auto;
  background: #fff;
  border: 1.6px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lift);
  display: grid; grid-template-columns: repeat(4, 1fr);
  padding: 24px 12px;
}
.stat { text-align: center; display: flex; flex-direction: column; gap: 2px; }
.stat + .stat { border-left: 1.6px solid var(--border); }
.stat-num { font-size: 36px; font-weight: 800; line-height: 1.15; font-variant-numeric: tabular-nums; color: var(--text-1); }
.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: 16px 0; }
  .stat:nth-child(3) { border-left: none; }
  .stat-num { font-size: 27px; }
}

/* ── 点名册 ────────────────────────────────────────────── */
.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: 700; cursor: pointer; color: var(--text-2); background: #fff; border: 1.6px solid var(--border); border-radius: 999px; padding: 8px 20px; transition: all 0.3s var(--spring); }
.chip:hover { border-color: var(--ink); color: var(--text-1); transform: translateY(-1.5px); }
.chip.is-active { background: var(--ink); border-color: var(--ink); color: #fff; box-shadow: 0 4px 14px -4px rgba(var(--ink-rgb), 0.4); }

.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: 1.6px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 16px 16px; overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform 0.45s var(--spring), box-shadow 0.45s var(--spring), border-color 0.45s var(--spring);
}
.member-card.hidden { display: none; }
.member-card::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(130% 52% at 50% -6%, rgba(var(--glow), 0.14), transparent 66%),
    radial-gradient(120% 28% at 50% 108%, rgba(var(--glow), 0.05), transparent 62%);
  pointer-events: none;
}
.member-card:hover { transform: translateY(-6px) rotate(-0.6deg); box-shadow: var(--shadow-lift); border-color: rgba(var(--glow), 0.45); }
.member-bust { position: relative; height: 164px; 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 0.5s var(--spring); -webkit-user-drag: none; }
.member-card:hover .member-bust img { transform: scale(1.07) translateY(-3px); }
.member-card h3 { font-size: 15.5px; font-weight: 800; 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: 700; color: var(--text-2); background: #F1F4F9; border: 1px solid var(--border); border-radius: 999px; padding: 3px 9px; 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; }

/* ── 社团技能 ──────────────────────────────────────────── */
.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: 1.6px solid var(--border); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow-card); transition: transform 0.45s var(--spring), box-shadow 0.45s var(--spring); }
.bento-card:hover { transform: translateY(-5px) rotate(-0.4deg); box-shadow: var(--shadow-lift); }
.bento-card h3 { font-size: 17px; font-weight: 800; 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: 48px; height: 48px; border-radius: 16px; display: grid; place-items: center; margin-bottom: 16px; color: var(--text-1); }
.ic-sky { background: var(--sky); }
.ic-mint, .ic-butter, .ic-rose, .ic-lilac { background: var(--mint-bg); }
.ic-butter { background: var(--butter); }
.ic-rose { background: var(--rose); }
.ic-lilac { background: var(--lilac); }
.bento-icon .ic { width: 25px; height: 25px; stroke-width: 1.8; }

.runtime-badges { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 18px; position: relative; }
.rt-badge { font-size: 12.5px; font-weight: 700; 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: 0 3px 0 rgba(var(--ink-rgb), 0.35); }

.demo-chat { position: relative; background: var(--bg-page); border: 1.6px solid var(--border); border-radius: 18px; 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: 14px; }
.chat-user { align-self: flex-end; background: var(--primary-light); border: 1.4px solid var(--primary-border); color: var(--text-1); border-bottom-right-radius: 5px; }
.chat-ai { align-self: flex-start; color: var(--text-1); background: #fff; border: 1.4px solid var(--border); border-bottom-left-radius: 5px; }
.chat-ai b { color: var(--primary); }
.chat-delegate { align-self: flex-start; display: flex; gap: 10px; background: #fff; border: 1.4px solid var(--border); border-radius: 16px; padding: 10px 12px; box-shadow: var(--shadow-card); max-width: 96%; }
.chat-avatar { width: 36px; height: 36px; border-radius: 12px; overflow: hidden; flex: none; background: #fff; border: 1.4px solid var(--border); }
.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; }
@keyframes mintPulse { 0% { box-shadow: 0 0 0 0 rgba(18,165,148,.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); } }

/* ── 圆桌时间 · 操场圆毯 ───────────────────────────────── */
.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: 2.2; }

.rt-scene { position: relative; aspect-ratio: 10 / 8.2; max-width: 600px; margin: 0 auto; width: 100%; }
.rt-rug {
  position: absolute; left: 50%; bottom: 6%;
  width: 88%; height: 58%;
  translate: -50%;
  border-radius: 50%;
  background:
    radial-gradient(ellipse at 50% 42%, rgba(255, 255, 255, 0.9), transparent 62%),
    linear-gradient(178deg, #FFE9F0 0%, #FDEFF2 40%, #F3F0FE 100%);
  border: 2px dashed rgba(var(--primary-rgb), 0.28);
  box-shadow: 0 22px 46px -18px rgba(80, 63, 165, 0.28), 0 3px 8px rgba(80, 63, 165, 0.08);
}
.rt-rug-inner { position: absolute; inset: 10%; border-radius: 50%; border: 2px dashed rgba(var(--primary-rgb), 0.18); }
.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), 0.18), transparent 74%); animation: poolBreath 7.2s var(--ease) infinite; }
@keyframes poolBreath { 0%, 100% { opacity: 0.45; } 50% { opacity: 1; } }

.rt-seat { position: absolute; z-index: 4; }
.rt-seat img {
  width: 100%; aspect-ratio: 1; object-fit: cover;
  border-radius: 30%;
  background: #fff;
  border: 2.4px solid rgba(var(--glow), 0.4);
  box-shadow: 0 0 0 3px rgba(var(--glow), 0.12), 0 10px 24px -8px rgba(80, 63, 165, 0.26);
  mix-blend-mode: multiply;
  animation: seatLive 7.2s var(--spring) 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: 700; color: var(--text-2);
  background: rgba(255, 255, 255, 0.94);
  border: 1.4px solid var(--border);
  border-radius: 999px; padding: 3px 10px;
  white-space: nowrap;
  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), 0.1), 0 10px 24px -8px rgba(80, 63, 165, 0.26); }
  16%, 42% { transform: translateY(-8px); box-shadow: 0 0 0 4px rgba(var(--glow), 0.32), 0 16px 30px -8px rgba(var(--glow), 0.45); }
  55%, 100% { transform: translateY(0); box-shadow: 0 0 0 3px rgba(var(--glow), 0.1), 0 10px 24px -8px rgba(80, 63, 165, 0.26); }
}
.rs-back1 { width: 16%; left: 16%; top: 15%; }
.rs-back2 { width: 15%; left: 42.5%; top: 9%; }
.rs-back3 { width: 16%; right: 16%; top: 15%; }
.rs-front { width: 20%; left: 50%; top: 39%; translate: -50%; }
.rs-front figcaption { color: var(--primary); border-color: var(--primary-border); background: var(--primary-light); }

.rt-ripple { position: absolute; inset: -4%; border-radius: 32%; border: 2.4px 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: 0.8; } 42% { transform: scale(1.42); opacity: 0; } 100% { transform: scale(1.42); opacity: 0; } }

.rt-you {
  position: absolute; z-index: 4; left: 50%; bottom: 1%;
  translate: -50%;
  background: var(--ink); color: rgba(255, 255, 255, 0.92);
  font-size: 12px; font-weight: 800; letter-spacing: 0.2em;
  padding: 8px 18px 8px 20px;
  border-radius: 999px;
  box-shadow: 0 4px 0 rgba(var(--ink-rgb), 0.28);
}
.rt-status {
  position: absolute; left: 0; top: 0;
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255, 255, 255, 0.94);
  border: 1.6px solid var(--border);
  border-radius: 999px;
  padding: 8px 15px;
  font-size: 12px; font-weight: 700; 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,.4); opacity: 1; } 50% { box-shadow: 0 0 0 5px rgba(234,179,8,.08); opacity: 0.75; } }

/* ── 开课三步 ──────────────────────────────────────────── */
.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: 1.6px solid var(--border); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow-card); transition: transform 0.45s var(--spring), box-shadow 0.45s var(--spring); }
.step:hover { transform: translateY(-5px) rotate(0.5deg); box-shadow: var(--shadow-lift); }
.step-no { font-size: 44px; font-weight: 800; line-height: 1; color: var(--text-1); opacity: 0.92; display: block; margin-bottom: 14px; font-variant-numeric: tabular-nums; }
.step:nth-child(1) .step-no { color: #2E90FA; }
.step:nth-child(2) .step-no { color: var(--mint); }
.step:nth-child(3) .step-no { color: #D97706; }
.step h3 { font-size: 16.5px; font-weight: 800; margin-bottom: 8px; }
.step p { font-size: 13.5px; color: var(--text-2); }
.teacher-strip {
  display: flex; gap: 16px; align-items: flex-start;
  background: #fff; border: 1.6px solid var(--border);
  border-radius: 18px; padding: 18px 22px; margin-top: 22px;
  box-shadow: var(--shadow-card);
}
.teacher-strip-icon { width: 40px; height: 40px; border-radius: 14px; flex: none; display: grid; place-items: center; background: var(--butter); color: var(--text-1); border: 1.4px solid var(--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: 100px; }
.dl-wrap {
  position: relative;
  border-radius: 26px;
  overflow: hidden;
  border: 1.6px solid rgba(var(--primary-rgb), 0.16);
  background: linear-gradient(180deg, #FFFFFF 0%, #F7F5FD 100%);
  box-shadow: var(--shadow-lift);
  padding: 70px 28px 54px;
  text-align: center;
}
.dl-dawn { position: absolute; inset: 0; pointer-events: none; opacity: 0.75; }
.dl-dawn .blob-b { width: 460px; height: 300px; left: -60px; top: -110px; }
.dl-dawn .blob-c { width: 460px; height: 320px; right: -80px; top: -80px; }
.dl-head { position: relative; margin-bottom: 42px; }
.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: 1.6px solid var(--border); border-radius: 20px; padding: 26px; box-shadow: var(--shadow-card); display: flex; flex-direction: column; gap: 16px; transition: transform 0.45s var(--spring), box-shadow 0.45s var(--spring); }
.dl-card:hover { transform: translateY(-4px) rotate(-0.4deg); 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: 800; 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: 32px; 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; margin-top: 30px; }
.footer-wave { display: block; width: 100%; height: 64px; }
.footer-inner { max-width: 1180px; margin: 0 auto; padding: 34px 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; font-weight: 800; 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, 0.12); }
.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, 0.18); border-radius: 999px; padding: 3px 12px; transition: all 0.25s var(--ease); }
.footer-versions a:hover { color: #fff; border-color: rgba(255, 255, 255, 0.45); background: rgba(255, 255, 255, 0.07); }

/* ── 回到顶部 ──────────────────────────────────── */
.backtop { position: fixed; right: 26px; bottom: 26px; z-index: 90; width: 46px; height: 46px; border-radius: 16px; border: none; cursor: pointer; background: var(--ink); color: #fff; display: grid; place-items: center; box-shadow: 0 4px 0 rgba(var(--ink-rgb), 0.3); opacity: 0; pointer-events: none; transform: translateY(14px); transition: opacity 0.35s var(--spring), transform 0.35s var(--spring), background 0.25s; }
.backtop.show { opacity: 1; pointer-events: auto; transform: none; }
.backtop:hover { background: var(--ink-hover); transform: translateY(-2px); }

/* ── 响应式 ────────────────────────────────────────────── */
@media (max-width: 1020px) {
  .hero-inner { padding: 0 20px; }
  .hero-lineup { max-width: 640px; height: 260px; }
  .lc-1 { left: 4%; } .lc-4 { right: 4%; }
}
@media (max-width: 620px) {
  .section { padding: 72px 20px 24px; }
  .hero { padding-top: 112px; }
  .hero-lineup { height: 210px; }
  .lc-hero { width: 158px; bottom: 30px; }
  .lc-1, .lc-4 { width: 104px; bottom: 92px; }
  .lc-2, .lc-3 { width: 112px; bottom: 56px; }
  .sun { width: 150px; height: 150px; }
  .stat-num { font-size: 26px; }
  .dl-wrap { padding: 50px 18px 40px; }
  .btn-lg { font-size: 14px; padding: 13px 20px; }
  .btn-meta { display: none; }
}