:root {
    --primary: #0d9488;
    --primary-dark: #0f766e;
    --primary-light: #ccfbf1;
    --accent: #f97316;
    --accent-light: #ffedd5;
    --ink: #0f172a;
    --ink-soft: #475569;
    --ink-mute: #94a3b8;
    --bg: #f0fdfa;
    --card: #ffffff;
    --line: #e2e8f0;
    --radius: 20px;
  }

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

  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--ink);
    background: var(--bg);
    line-height: 1.65;
    scroll-behavior: smooth;
    overflow-x: hidden;
  }

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

  /* ===== 动画 ===== */
  @keyframes riseUp {
    from { opacity:0; transform: translateY(24px); }
    to { opacity:1; transform: translateY(0); }
  }
  @keyframes drift {
    0%,100% { transform: translate(0,0) rotate(0deg); }
    50% { transform: translate(14px,-18px) rotate(4deg); }
  }
  @keyframes ping {
    0% { transform: scale(1); opacity: 0.6; }
    100% { transform: scale(2.2); opacity: 0; }
  }
  @keyframes scroll-x {
    from { transform: translateX(0); }
    to { transform: translateX(-50%); }
  }
  @keyframes softBlink {
    0%,100% { opacity:1; }
    50% { opacity:0.4; }
  }

  .rise { opacity:0; transform: translateY(24px); transition: opacity .8s ease, transform .8s ease; }
  .rise.show { opacity:1; transform: translateY(0); }

  /* ===== 顶部 ===== */
  .topbar {
    background: var(--primary);
    color: #fff;
    font-size: .82rem;
    padding: 8px 0;
  }
  .topbar .wrap {
    max-width: 1200px; margin: 0 auto; padding: 0 24px;
    display: flex; justify-content: space-between; align-items: center;
    flex-wrap: wrap; gap: 8px;
  }
  .topbar .left { display: flex; align-items: center; gap: 6px; }
  .topbar .ping {
    width: 8px; height: 8px; border-radius: 50%;
    background: #86efac; position: relative;
  }
  .topbar .ping::after {
    content:""; position:absolute; inset:0; border-radius:50%;
    background:#86efac; animation: ping 1.6s infinite;
  }
  .topbar .right a { text-decoration: underline; }

  /* ===== 导航 ===== */
  .nav {
    position: sticky; top: 0; z-index: 900;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
  }
  .nav .wrap {
    max-width: 1200px; margin: 0 auto; padding: 0 24px;
    height: 74px; display: flex; align-items: center; justify-content: space-between;
  }
  .brand {
    display: flex; align-items: center; gap: 10px;
  }
  .brand-mark {
    width: 42px; height: 42px; border-radius: 14px;
    background: linear-gradient(135deg, var(--primary), #14b8a6);
    color: #fff; font-weight: 800; font-size: 1.15rem;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 6px 16px rgba(13,148,136,.28);
  }
  .brand-text .name { font-size: 1.15rem; font-weight: 800; color: var(--primary-dark); letter-spacing: .5px; }
  .brand-text .tag { font-size: .68rem; color: var(--ink-mute); letter-spacing: 2px; }

  .menu { display: flex; align-items: center; gap: 26px; font-size: .93rem; font-weight: 500; color: var(--ink-soft); }
  .menu a:hover { color: var(--primary); }
  .menu .pill {
    background: var(--accent);
    color: #fff !important;
    padding: 10px 24px; border-radius: 999px;
    font-weight: 700; font-size: .9rem;
    box-shadow: 0 6px 18px rgba(249,115,22,.3);
    transition: transform .2s, box-shadow .2s;
  }
  .menu .pill:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(249,115,22,.4); }

  /* ===== HERO ===== */
  .hero {
    position: relative;
    padding: 72px 0 90px;
    overflow: hidden;
  }
  .hero .blob {
    position: absolute; border-radius: 50%; filter: blur(60px); opacity: .5;
    pointer-events: none;
  }
  .hero .blob.b1 { width: 460px; height: 460px; background: #99f6e4; top: -140px; right: -120px; animation: drift 12s ease-in-out infinite; }
  .hero .blob.b2 { width: 380px; height: 380px; background: #fed7aa; bottom: -160px; left: -100px; animation: drift 14s ease-in-out infinite reverse; }

  .hero .wrap {
    max-width: 1200px; margin: 0 auto; padding: 0 24px;
    position: relative; z-index: 2;
    display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center;
  }

  .hero-copy .kicker {
    display: inline-flex; align-items: center; gap: 8px;
    background: #fff; border: 1px solid var(--line);
    padding: 7px 16px; border-radius: 999px;
    font-size: .8rem; font-weight: 700; color: var(--primary-dark);
    box-shadow: 0 4px 14px rgba(13,148,136,.08);
    margin-bottom: 22px;
  }
  .hero-copy .kicker .dot {
    width: 7px; height: 7px; border-radius: 50%; background: var(--accent);
  }
  .hero-copy h1 {
    font-size: 2.85rem; line-height: 1.22; font-weight: 800;
    letter-spacing: -.5px; margin-bottom: 20px;
  }
  .hero-copy h1 .hl {
    color: var(--primary);
    background: linear-gradient(transparent 62%, #99f6e4 62%);
    padding: 0 4px;
  }
  .hero-copy .lead {
    font-size: 1.05rem; color: var(--ink-soft); margin-bottom: 30px; max-width: 520px;
  }
  .hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 34px; }
  .btn-solid {
    background: var(--accent); color: #fff;
    padding: 15px 40px; border-radius: 999px;
    font-weight: 700; font-size: 1rem;
    box-shadow: 0 10px 26px rgba(249,115,22,.32);
    transition: transform .2s, box-shadow .2s;
    display: inline-flex; align-items: center; gap: 8px;
  }
  .btn-solid:hover { transform: translateY(-3px); box-shadow: 0 14px 34px rgba(249,115,22,.42); }
  .btn-ghost {
    background: #fff; color: var(--primary-dark);
    padding: 15px 32px; border-radius: 999px;
    font-weight: 700; font-size: 1rem;
    border: 1.5px solid #99f6e4;
    transition: background .2s, border-color .2s;
    display: inline-flex; align-items: center; gap: 8px;
  }
  .btn-ghost:hover { background: var(--primary-light); border-color: var(--primary); }

  .hero-metrics {
    display: flex; gap: 34px; flex-wrap: wrap;
  }
  .metric .num { font-size: 1.7rem; font-weight: 800; color: var(--primary-dark); }
  .metric .lbl { font-size: .8rem; color: var(--ink-mute); }

  /* 右侧卡片堆 */
  .hero-cards {
    position: relative;
  }
  .hero-cards .stack {
    background: #fff; border-radius: 24px; padding: 28px;
    box-shadow: 0 24px 60px rgba(13,148,136,.14);
    border: 1px solid #d1fae5;
  }
  .hero-cards .stack h3 {
    font-size: 1.05rem; font-weight: 800; margin-bottom: 6px;
  }
  .hero-cards .stack .hint { font-size: .84rem; color: var(--ink-mute); margin-bottom: 18px; }

  .mini-course {
    display: flex; align-items: center; gap: 14px;
    padding: 13px 14px; border-radius: 14px;
    border: 1px solid var(--line); margin-bottom: 10px;
    transition: border-color .2s, transform .2s;
    cursor: pointer;
  }
  .mini-course:hover { border-color: var(--primary); transform: translateX(4px); }
  .mini-course .ico {
    width: 42px; height: 42px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.25rem; flex-shrink: 0;
  }
  .ico.teal { background: #ccfbf1; }
  .ico.blue { background: #dbeafe; }
  .ico.orange { background: #ffedd5; }
  .ico.purple { background: #ede9fe; }
  .mini-course .txt { flex: 1; }
  .mini-course .txt .n { font-size: .93rem; font-weight: 700; }
  .mini-course .txt .d { font-size: .76rem; color: var(--ink-mute); }
  .mini-course .arrow { color: var(--ink-mute); font-size: .9rem; }

  .stack-foot {
    margin-top: 18px; padding-top: 16px; border-top: 1px dashed var(--line);
    display: flex; justify-content: space-between; align-items: center;
    font-size: .82rem; color: var(--ink-mute);
  }
  .stack-foot strong { color: var(--accent); font-size: 1rem; }

  .badge-float {
    position: absolute; background: #fff; border-radius: 16px;
    padding: 12px 18px; box-shadow: 0 14px 34px rgba(15,23,42,.12);
    font-size: .82rem; font-weight: 700;
    display: flex; align-items: center; gap: 8px;
    border: 1px solid var(--line);
  }
  .badge-float.f1 { top: -18px; left: -22px; }
  .badge-float.f2 { bottom: -20px; right: -16px; }
  .badge-float .em { font-size: 1.1rem; }

  /* ===== 品牌色带 ===== */
  .ribbon {
    background: var(--primary-dark);
    color: #fff; padding: 18px 0; overflow: hidden;
  }
  .ribbon .track {
    display: flex; gap: 48px; width: max-content;
    animation: scroll-x 26s linear infinite;
    font-size: .9rem; font-weight: 600; white-space: nowrap;
  }
  .ribbon .track span { display: inline-flex; align-items: center; gap: 10px; opacity: .9; }
  .ribbon .track span::before { content:"◆"; color: #5eead4; font-size: .7rem; }

  /* ===== 区块通用 ===== */
  .block { padding: 84px 0; }
  .block.white { background: #fff; }
  .wrap { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

  .head { max-width: 680px; margin-bottom: 48px; }
  .head.center { margin-left: auto; margin-right: auto; text-align: center; }
  .head .eyebrow {
    font-size: .78rem; font-weight: 800; letter-spacing: 2.5px;
    color: var(--primary); text-transform: uppercase; margin-bottom: 12px;
    display: inline-block;
  }
  .head h2 {
    font-size: 2.1rem; font-weight: 800; line-height: 1.3; letter-spacing: -.5px;
    margin-bottom: 14px;
  }
  .head p { font-size: .98rem; color: var(--ink-soft); }

  /* ===== 优势 4 格 ===== */
  .adv-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 22px; }
  .adv-card {
    background: var(--card); border: 1px solid var(--line);
    border-radius: var(--radius); padding: 30px 24px;
    transition: transform .25s, box-shadow .25s, border-color .25s;
  }
  .adv-card:hover { transform: translateY(-6px); box-shadow: 0 18px 40px rgba(13,148,136,.12); border-color: #99f6e4; }
  .adv-card .glyph {
    width: 54px; height: 54px; border-radius: 16px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.5rem; margin-bottom: 18px;
  }
  .adv-card h4 { font-size: 1.02rem; font-weight: 800; margin-bottom: 8px; }
  .adv-card p { font-size: .86rem; color: var(--ink-soft); line-height: 1.65; }

  /* ===== 授权条 ===== */
  .auth-strip {
    display: grid; grid-template-columns: repeat(4,1fr); gap: 18px;
  }
  .auth-item {
    background: #fff; border: 1px solid var(--line);
    border-radius: 16px; padding: 24px 20px;
    display: flex; gap: 14px; align-items: flex-start;
    transition: border-color .2s, box-shadow .2s;
  }
  .auth-item:hover { border-color: var(--primary); box-shadow: 0 12px 28px rgba(13,148,136,.1); }
  .auth-item .seal {
    width: 46px; height: 46px; border-radius: 50%; flex-shrink: 0;
    background: var(--primary-light); color: var(--primary-dark);
    display: flex; align-items: center; justify-content: center;
    font-weight: 800; font-size: .78rem; text-align: center; line-height: 1.1;
  }
  .auth-item .meta h5 { font-size: .95rem; font-weight: 800; margin-bottom: 4px; }
  .auth-item .meta p { font-size: .8rem; color: var(--ink-mute); }
  .auth-item .meta .tag {
    display: inline-block; margin-top: 8px;
    background: var(--accent-light); color: #c2410c;
    font-size: .72rem; font-weight: 700;
    padding: 3px 10px; border-radius: 999px;
  }

  /* ===== 课程大卡 ===== */
  .course-row { display: grid; grid-template-columns: repeat(2,1fr); gap: 24px; }
  .course-big {
    background: #fff; border: 1px solid var(--line); border-radius: 24px;
    padding: 34px 32px; position: relative;
    display: flex; flex-direction: column;
    transition: transform .25s, box-shadow .25s, border-color .25s;
  }
  .course-big:hover { transform: translateY(-5px); box-shadow: 0 22px 52px rgba(13,148,136,.14); border-color: #99f6e4; }
  .course-big .corner {
    position: absolute; top: 24px; right: 26px;
    font-size: .72rem; font-weight: 800; letter-spacing: 1px;
    color: var(--ink-mute);
  }
  .course-big .title-row { display: flex; align-items: baseline; gap: 10px; margin-bottom: 6px; }
  .course-big .title-row h3 { font-size: 1.6rem; font-weight: 800; color: var(--primary-dark); }
  .course-big .title-row .cn { font-size: .95rem; font-weight: 700; color: var(--ink); }
  .course-big .issuer { font-size: .84rem; color: var(--ink-mute); margin-bottom: 18px; }
  .course-big .body { font-size: .9rem; color: var(--ink-soft); margin-bottom: 18px; }
  .course-big .feature-list {
    list-style: none; margin-bottom: 22px;
    display: grid; grid-template-columns: 1fr 1fr; gap: 8px 16px;
  }
  .course-big .feature-list li {
    font-size: .84rem; color: var(--ink-soft);
    padding-left: 20px; position: relative;
  }
  .course-big .feature-list li::before {
    content: "✓"; position: absolute; left: 0; top: 0;
    color: var(--primary); font-weight: 800;
  }
  .course-big .meta-bar {
    margin-top: auto; display: flex; align-items: center; justify-content: space-between;
    padding-top: 20px; border-top: 1px dashed var(--line);
  }
  .course-big .meta-bar .fee { font-size: .88rem; color: #dc2626; font-weight: 800; }
  .course-big .meta-bar .go {
    background: var(--primary); color: #fff;
    padding: 11px 26px; border-radius: 999px;
    font-weight: 700; font-size: .88rem;
    transition: background .2s, transform .2s;
    cursor: pointer; border: none;
  }
  .course-big .meta-bar .go:hover { background: var(--primary-dark); transform: translateY(-2px); }

  /* ===== 时间轴（报考流程） ===== */
  .timeline { position: relative; padding-left: 8px; }
  .timeline::before {
    content: ""; position: absolute; left: 26px; top: 12px; bottom: 12px;
    width: 2px; background: linear-gradient(#99f6e4, #5eead4, #99f6e4);
  }
  .tl-item { display: flex; gap: 24px; margin-bottom: 26px; position: relative; }
  .tl-item:last-child { margin-bottom: 0; }
  .tl-dot {
    width: 52px; height: 52px; border-radius: 50%; flex-shrink: 0;
    background: #fff; border: 2px solid var(--primary);
    color: var(--primary-dark); font-weight: 800;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.05rem; position: relative; z-index: 2;
    box-shadow: 0 0 0 6px rgba(13,148,136,.06);
  }
  .tl-body {
    background: #fff; border: 1px solid var(--line); border-radius: 16px;
    padding: 20px 24px; flex: 1;
    transition: border-color .2s, box-shadow .2s;
  }
  .tl-item:hover .tl-body { border-color: var(--primary); box-shadow: 0 10px 26px rgba(13,148,136,.08); }
  .tl-body h4 { font-size: 1rem; font-weight: 800; margin-bottom: 6px; }
  .tl-body p { font-size: .86rem; color: var(--ink-soft); }

  /* ===== 师资 ===== */
  .teacher-wall { display: grid; grid-template-columns: repeat(4,1fr); gap: 22px; }
  .t-card {
    background: #fff; border: 1px solid var(--line); border-radius: 20px;
    padding: 30px 22px; text-align: center;
    transition: transform .25s, box-shadow .25s;
  }
  .t-card:hover { transform: translateY(-6px); box-shadow: 0 18px 40px rgba(13,148,136,.12); }
  .t-ava {
    width: 72px; height: 72px; border-radius: 50%; margin: 0 auto 16px;
    background: linear-gradient(135deg, var(--primary-light), #a7f3d0);
    color: var(--primary-dark); font-weight: 800; font-size: 1.5rem;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 8px 20px rgba(13,148,136,.16);
  }
  .t-card h4 { font-size: 1rem; font-weight: 800; margin-bottom: 2px; }
  .t-card .role { font-size: .78rem; font-weight: 700; color: var(--accent); margin-bottom: 10px; }
  .t-card p { font-size: .82rem; color: var(--ink-soft); line-height: 1.6; }

  /* ===== 开班表 ===== */
  .sched-wrap {
    background: #fff; border: 1px solid var(--line); border-radius: 24px;
    overflow: hidden; box-shadow: 0 14px 40px rgba(13,148,136,.07);
  }
  table.sched { width: 100%; border-collapse: collapse; }
  table.sched thead tr { background: #f0fdfa; }
  table.sched th {
    text-align: left; padding: 18px 22px;
    font-size: .82rem; font-weight: 800; color: var(--primary-dark);
    letter-spacing: 1px; text-transform: uppercase;
    border-bottom: 1px solid #ccfbf1;
  }
  table.sched td {
    padding: 18px 22px; font-size: .88rem; color: var(--ink-soft);
    border-bottom: 1px solid #f1f5f9;
  }
  table.sched tbody tr:last-child td { border-bottom: none; }
  table.sched tbody tr:hover { background: #f8fefc; }
  table.sched .proj { font-weight: 800; color: var(--ink); }
  .chip {
    display: inline-block; padding: 4px 12px; border-radius: 999px;
    font-size: .74rem; font-weight: 700;
  }
  .chip.hot { background: #fee2e2; color: #b91c1c; }
  .chip.open { background: #dcfce7; color: #15803d; }
  .chip.soon { background: #fef3c7; color: #b45309; }
  table.sched .join {
    color: var(--primary); font-weight: 800; cursor: pointer;
    background: none; border: none; font-size: .86rem;
    text-decoration: underline; text-underline-offset: 3px;
  }

  /* ===== 双栏报名表单 ===== */
  .signup {
    background: linear-gradient(135deg, #f0fdfa 0%, #ecfeff 100%);
    border-top: 1px solid #ccfbf1;
    border-bottom: 1px solid #ccfbf1;
  }
  .signup .wrap {
    display: grid; grid-template-columns: .95fr 1.05fr; gap: 56px; align-items: center;
  }
  .signup-copy h2 { font-size: 2.1rem; font-weight: 800; margin-bottom: 16px; line-height: 1.3; }
  .signup-copy p { font-size: .98rem; color: var(--ink-soft); margin-bottom: 24px; }
  .signup-copy .check-list { list-style: none; }
  .signup-copy .check-list li {
    font-size: .9rem; color: var(--ink-soft);
    padding: 8px 0 8px 28px; position: relative;
  }
  .signup-copy .check-list li::before {
    content: "✓"; position: absolute; left: 0; top: 8px;
    width: 20px; height: 20px; border-radius: 50%;
    background: var(--primary); color: #fff;
    font-size: .72rem; font-weight: 800;
    display: flex; align-items: center; justify-content: center;
  }

  .form-card {
    background: #fff; border-radius: 24px; padding: 40px 36px;
    box-shadow: 0 24px 60px rgba(13,148,136,.16);
    border: 1px solid #d1fae5;
  }
  .form-card h3 {
    font-size: 1.3rem; font-weight: 800; margin-bottom: 6px;
  }
  .form-card .sub { font-size: .86rem; color: var(--ink-mute); margin-bottom: 26px; }
  .field { margin-bottom: 18px; }
  .field label {
    display: block; font-size: .84rem; font-weight: 700;
    color: var(--ink-soft); margin-bottom: 7px;
  }
  .field label .req { color: #ef4444; }
  .field input, .field select {
    width: 100%; padding: 13px 16px;
    border: 1.5px solid var(--line); border-radius: 12px;
    font-size: .95rem; font-family: inherit; color: var(--ink);
    background: #f8fafc; outline: none;
    transition: border-color .2s, box-shadow .2s, background .2s;
  }
  .field input:focus, .field select:focus {
    border-color: var(--primary); background: #fff;
    box-shadow: 0 0 0 4px rgba(13,148,136,.1);
  }
  .field input::placeholder { color: var(--ink-mute); }
  .field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

  .form-card .cta {
    width: 100%; padding: 15px; border: none; border-radius: 12px;
    background: var(--accent); color: #fff;
    font-size: 1.05rem; font-weight: 800; letter-spacing: .5px;
    cursor: pointer; transition: transform .2s, box-shadow .2s;
    box-shadow: 0 10px 26px rgba(249,115,22,.32);
    margin-top: 6px;
  }
  .form-card .cta:hover { transform: translateY(-2px); box-shadow: 0 14px 34px rgba(249,115,22,.42); }
  .form-card .fine { font-size: .78rem; color: var(--ink-mute); text-align: center; margin-top: 14px; }

  /* ===== 学员评价（横排滚动） ===== */
  .voice-marquee { overflow: hidden; padding: 8px 0; }
  .voice-track { display: flex; gap: 20px; width: max-content; animation: scroll-x 40s linear infinite; }
  .voice-marquee:hover .voice-track { animation-play-state: paused; }
  .voice {
    width: 360px; flex-shrink: 0;
    background: #fff; border: 1px solid var(--line); border-radius: 20px;
    padding: 28px 26px;
  }
  .voice .stars { color: #f59e0b; letter-spacing: 2px; margin-bottom: 12px; font-size: .92rem; }
  .voice .txt { font-size: .89rem; color: var(--ink-soft); line-height: 1.75; margin-bottom: 18px; }
  .voice .who { display: flex; align-items: center; gap: 12px; padding-top: 14px; border-top: 1px dashed var(--line); }
  .voice .who .av {
    width: 42px; height: 42px; border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), #2dd4bf);
    color: #fff; font-weight: 800; display: flex; align-items: center; justify-content: center;
  }
  .voice .who .nm { font-size: .88rem; font-weight: 800; }
  .voice .who .mt { font-size: .76rem; color: var(--ink-mute); }

  /* ===== 数字成绩条 ===== */
  .stat-band {
    background: var(--primary-dark); color: #fff;
    border-radius: 28px; padding: 48px 40px;
    display: grid; grid-template-columns: repeat(4,1fr); gap: 20px;
    position: relative; overflow: hidden;
  }
  .stat-band::before {
    content: ""; position: absolute; top: -80px; right: -60px;
    width: 260px; height: 260px; border-radius: 50%;
    background: rgba(94,234,212,.14);
  }
  .stat-band .cell { text-align: center; position: relative; z-index: 2; }
  .stat-band .cell .v { font-size: 2.3rem; font-weight: 800; color: #5eead4; line-height: 1; }
  .stat-band .cell .v small { font-size: 1rem; }
  .stat-band .cell .l { font-size: .84rem; opacity: .82; margin-top: 8px; }

  /* ===== 合作企业（网格） ===== */
  .logo-wall { display: grid; grid-template-columns: repeat(5,1fr); gap: 16px; }
  .logo-cell {
    background: #fff; border: 1px solid var(--line); border-radius: 14px;
    padding: 22px 12px; text-align: center;
    font-size: .88rem; font-weight: 700; color: var(--ink-soft);
    transition: border-color .2s, color .2s, transform .2s;
  }
  .logo-cell:hover { border-color: var(--primary); color: var(--primary-dark); transform: translateY(-3px); }

  /* ===== FAQ ===== */
  .faq-wrap { max-width: 820px; margin: 0 auto; }
  .faq-row {
    background: #fff; border: 1px solid var(--line); border-radius: 16px;
    margin-bottom: 12px; overflow: hidden;
    transition: border-color .2s, box-shadow .2s;
  }
  .faq-row.on { border-color: var(--primary); box-shadow: 0 12px 30px rgba(13,148,136,.1); }
  .faq-head {
    padding: 20px 26px; display: flex; align-items: center; justify-content: space-between;
    cursor: pointer; font-size: .98rem; font-weight: 700;
  }
  .faq-head .plus {
    width: 26px; height: 26px; border-radius: 50%;
    background: var(--primary-light); color: var(--primary-dark);
    display: flex; align-items: center; justify-content: center;
    font-weight: 800; font-size: 1rem; flex-shrink: 0; margin-left: 14px;
    transition: transform .3s, background .3s, color .3s;
  }
  .faq-row.on .faq-head .plus { background: var(--primary); color: #fff; transform: rotate(45deg); }
  .faq-body {
    max-height: 0; overflow: hidden; padding: 0 26px;
    font-size: .88rem; color: var(--ink-soft); line-height: 1.8;
    transition: max-height .35s ease, padding .35s ease;
  }
  .faq-row.on .faq-body { max-height: 320px; padding: 0 26px 22px; }

  /* ===== 关于我们（左文右卡） ===== */
  .about-2col { display: grid; grid-template-columns: 1.15fr .85fr; gap: 52px; align-items: start; }
  .about-copy p { font-size: .96rem; color: var(--ink-soft); line-height: 1.95; margin-bottom: 14px; }
  .about-copy .hl { background: var(--primary-light); color: var(--primary-dark); padding: 2px 8px; border-radius: 6px; font-weight: 700; }
  .about-facts {
    background: #fff; border: 1px solid var(--line); border-radius: 22px;
    padding: 32px 28px; box-shadow: 0 14px 40px rgba(13,148,136,.07);
  }
  .about-facts h4 { font-size: 1rem; font-weight: 800; margin-bottom: 20px; }
  .fact-row {
    display: flex; justify-content: space-between; align-items: center;
    padding: 14px 0; border-bottom: 1px dashed var(--line);
    font-size: .88rem; color: var(--ink-soft);
  }
  .fact-row:last-child { border-bottom: none; }
  .fact-row strong { color: var(--primary-dark); font-size: .95rem; }

  /* ===== 联系 ===== */
  .contact-2col { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
  .c-box {
    background: #fff; border: 1px solid var(--line); border-radius: 22px;
    padding: 36px 32px;
  }
  .c-box h3 {
    font-size: 1.15rem; font-weight: 800; margin-bottom: 22px;
    display: flex; align-items: center; gap: 10px;
  }
  .c-box h3 .ic {
    width: 34px; height: 34px; border-radius: 10px;
    background: var(--primary-light); color: var(--primary-dark);
    display: flex; align-items: center; justify-content: center;
    font-size: 1rem;
  }
  .c-line {
    display: flex; gap: 12px; margin-bottom: 16px; font-size: .92rem; color: var(--ink-soft);
  }
  .c-line .k { width: 22px; flex-shrink: 0; text-align: center; }
  .c-line strong { color: var(--ink); }
  .c-line a { color: var(--primary); font-weight: 700; }
  .c-line a:hover { text-decoration: underline; }
  .c-projects { list-style: none; }
  .c-projects li {
    padding: 14px 0; border-bottom: 1px dashed var(--line);
    font-size: .88rem; color: var(--ink-soft);
  }
  .c-projects li:last-child { border-bottom: none; }
  .c-projects .nm { font-weight: 800; color: var(--primary-dark); display: block; margin-bottom: 3px; }
  .c-projects .ds { font-size: .8rem; color: var(--ink-mute); }

  /* ===== 页脚 ===== */
  .foot { background: #0f172a; color: #94a3b8; padding: 60px 0 26px; }
  .foot-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 40px; }
  .foot h5 { color: #fff; font-size: .96rem; font-weight: 800; margin-bottom: 18px; }
  .foot p, .foot li { font-size: .85rem; line-height: 1.95; }
  .foot ul { list-style: none; }
  .foot ul a:hover { color: #5eead4; }
  .foot .hot { font-size: 1.35rem; font-weight: 800; color: #5eead4; margin-top: 10px; letter-spacing: 1px; }
  .foot-base {
    max-width: 1200px; margin: 40px auto 0; padding-top: 24px;
    border-top: 1px solid #1e293b; text-align: center;
    font-size: .8rem; color: #64748b;
  }

  /* ===== 右下浮动 ===== */
  .side-dock {
    position: fixed; right: 22px; bottom: 90px; z-index: 800;
    display: flex; flex-direction: column; gap: 12px;
  }
  .dock-btn {
    width: 54px; height: 54px; border-radius: 18px;
    display: flex; align-items: center; justify-content: center;
    color: #fff; font-size: 1.3rem; cursor: pointer;
    box-shadow: 0 10px 26px rgba(15,23,42,.18);
    transition: transform .2s;
    position: relative;
  }
  .dock-btn:hover { transform: scale(1.08); }
  .dock-btn.a { background: linear-gradient(135deg, #10b981, #059669); }
  .dock-btn.b { background: linear-gradient(135deg, var(--primary), var(--primary-dark)); }
  .dock-btn.c { background: linear-gradient(135deg, #64748b, #475569); }
  .dock-btn .pop {
    position: absolute; right: 68px; top: 50%; transform: translateY(-50%);
    background: #0f172a; color: #fff; font-size: .8rem; font-weight: 600;
    padding: 8px 14px; border-radius: 10px; white-space: nowrap;
    opacity: 0; pointer-events: none; transition: opacity .2s;
  }
  .dock-btn:hover .pop { opacity: 1; }

  /* ===== 响应式 ===== */
  @media (max-width: 1024px) {
    .hero .wrap { grid-template-columns: 1fr; gap: 46px; }
    .hero-copy h1 { font-size: 2.3rem; }
    .adv-grid, .auth-strip, .teacher-wall { grid-template-columns: repeat(2,1fr); }
    .course-row { grid-template-columns: 1fr; }
    .stat-band { grid-template-columns: repeat(2,1fr); gap: 30px; }
    .logo-wall { grid-template-columns: repeat(3,1fr); }
    .signup .wrap { grid-template-columns: 1fr; gap: 40px; }
    .about-2col { grid-template-columns: 1fr; gap: 36px; }
    .contact-2col { grid-template-columns: 1fr; }
    .foot-grid { grid-template-columns: 1fr 1fr; }
  }
  @media (max-width: 768px) {
    .menu { display: none; }
    .hero-copy h1 { font-size: 1.85rem; }
    .head h2 { font-size: 1.6rem; }
    .signup-copy h2 { font-size: 1.6rem; }
    .adv-grid, .auth-strip, .teacher-wall { grid-template-columns: 1fr; }
    .logo-wall { grid-template-columns: repeat(2,1fr); }
    .stat-band { grid-template-columns: 1fr 1fr; padding: 34px 24px; }
    .field-row { grid-template-columns: 1fr; }
    .block { padding: 60px 0; }
    .foot-grid { grid-template-columns: 1fr; }
    .badge-float { display: none; }
    .timeline::before { left: 22px; }
    .tl-dot { width: 46px; height: 46px; }
  }
  @media (max-width: 480px) {
    .hero-copy h1 { font-size: 1.55rem; }
    .btn-solid, .btn-ghost { padding: 13px 26px; font-size: .92rem; }
    .hero-metrics { gap: 20px; }
    .metric .num { font-size: 1.35rem; }
    .form-card { padding: 28px 22px; }
    .voice { width: 290px; }
    .course-big .feature-list { grid-template-columns: 1fr; }
  }