/* ========== 设计变量 ========== */
  :root {
    --bg: #ffffff;
    --bg-soft: #f6f8fc;
    --card: #ffffff;
    --line: #e6eaf2;
    --text: #1a2233;
    --muted: #5f6a80;
    --accent: #2563eb;
    --accent-2: #7c3aed;
    --gradient: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
    --shadow: 0 1px 2px rgba(23, 32, 58, .04), 0 12px 32px rgba(23, 32, 58, .07);
    --shadow-hover: 0 4px 8px rgba(23, 32, 58, .06), 0 18px 44px rgba(23, 32, 58, .11);
    --radius: 16px;
    --maxw: 1200px;
    --header-h: 72px;
    font-size: 16px;
  }

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

  html { scroll-behavior: smooth; }

  body {
    font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
  }

  a { color: inherit; text-decoration: none; }
  ul { list-style: none; }
  img { max-width: 100%; display: block; }

  .container { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }

  section { scroll-margin-top: calc(var(--header-h) + 16px); }

  .section { padding: 108px 0; }
  .section.alt { background: var(--bg-soft); }

  .section-head { text-align: center; max-width: 640px; margin: 0 auto 56px; }
  .section-head .kicker {
    display: inline-block;
    font-size: .8rem;
    letter-spacing: .35em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 14px;
    font-weight: 600;
  }
  .section-head h2 { font-size: clamp(1.7rem, 3.2vw, 2.3rem); font-weight: 700; letter-spacing: .02em; }
  .section-head p { color: var(--muted); margin-top: 14px; font-size: .95rem; }

  /* ========== 按钮 ========== */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 32px;
    border-radius: 999px;
    font-size: .95rem;
    font-weight: 600;
    border: 1px solid transparent;
    cursor: pointer;
    transition: transform .2s, box-shadow .2s, background .2s, border-color .2s, color .2s;
  }
  .btn-primary {
    background: var(--gradient);
    color: #fff;
    box-shadow: 0 8px 24px rgba(37, 99, 235, .28);
  }
  .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(37, 99, 235, .4); }
  .btn-ghost {
    border-color: #d7dceb;
    color: var(--text);
    background: #fff;
  }
  .btn-ghost:hover { border-color: var(--accent); color: var(--accent); background: #f5f8ff; }

  /* ========== 顶部导航 ========== */
  .site-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    height: var(--header-h);
    display: flex;
    align-items: center;
    transition: background .3s, border-color .3s, box-shadow .3s;
    border-bottom: 1px solid transparent;
  }
  .site-header.scrolled {
    background: rgba(255, 255, 255, .88);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom-color: var(--line);
    box-shadow: 0 6px 24px rgba(23, 32, 58, .05);
  }
  .nav-inner {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 0 28px;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
  }
  .logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.05rem; color: var(--text); }
  .logo .logo-mark {
    width: 38px; height: 38px;
    border-radius: 50%;
    flex: none;
    object-fit: cover;
    box-shadow: 0 4px 12px rgba(37, 99, 235, .3);
  }
  .logo small { display: block; font-size: .62rem; font-weight: 500; color: var(--muted); line-height: 1; margin-top: 3px; letter-spacing: .08em; }

  .nav-links { display: flex; align-items: center; gap: 30px; font-size: .92rem; }
  .nav-links a { color: var(--muted); transition: color .2s; }
  .nav-links a:hover { color: var(--accent); }

  .nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px; height: 40px;
    background: none;
    border: 1px solid var(--line);
    border-radius: 10px;
    cursor: pointer;
    align-items: center;
  }
  .nav-toggle span {
    display: block;
    width: 18px; height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: transform .25s, opacity .25s;
  }
  .nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.active span:nth-child(2) { opacity: 0; }
  .nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  /* ========== Hero ========== */
  .hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    text-align: center;
    padding: calc(var(--header-h) + 70px) 0 90px;
    overflow: hidden;
    background: linear-gradient(180deg, #f3f7ff 0%, #fafbff 55%, #ffffff 100%);
  }
  .hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
      radial-gradient(640px 420px at 18% 18%, rgba(37, 99, 235, .10), transparent 70%),
      radial-gradient(720px 520px at 82% 72%, rgba(124, 58, 237, .09), transparent 70%);
    pointer-events: none;
  }
  .hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
      linear-gradient(rgba(23, 32, 58, .045) 1px, transparent 1px),
      linear-gradient(90deg, rgba(23, 32, 58, .045) 1px, transparent 1px);
    background-size: 56px 56px;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 30%, transparent 75%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 30%, transparent 75%);
    pointer-events: none;
  }
  .hero .container { position: relative; z-index: 1; }
  .hero h1 {
    font-size: clamp(2.6rem, 7vw, 4.6rem);
    font-weight: 800;
    letter-spacing: .04em;
    line-height: 1.2;
    color: var(--text);
  }
  .hero h1 .en {
    display: block;
    font-size: clamp(.85rem, 1.6vw, 1.1rem);
    font-weight: 500;
    letter-spacing: .5em;
    color: var(--muted);
    margin-top: 16px;
    text-transform: uppercase;
  }
  .hero .tagline {
    max-width: 560px;
    margin: 26px auto 0;
    color: var(--muted);
    font-size: clamp(.98rem, 2vw, 1.12rem);
  }
  .hero-meta {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-top: 28px;
  }
  .hero-meta span {
    font-size: .8rem;
    color: #4a5570;
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 5px 14px;
    background: #fff;
  }
  .age-badge {
    position: absolute;
    right: 26px; bottom: 26px;
    z-index: 1;
    width: 56px; height: 56px;
    border-radius: 50%;
    border: 2px solid #16a34a;
    color: #15803d;
    display: grid;
    place-items: center;
    font-size: .78rem;
    font-weight: 700;
    line-height: 1.1;
    text-align: center;
    background: rgba(255, 255, 255, .85);
  }

  /* ========== 游戏介绍 ========== */
  .game-copy { max-width: 820px; }
  .game-copy h2 { font-size: clamp(1.5rem, 3vw, 2.05rem); margin-bottom: 8px; letter-spacing: .02em; }
  .game-copy .sub { color: var(--accent); font-size: .85rem; letter-spacing: .3em; margin-bottom: 20px; font-weight: 600; }
  .game-copy p { color: var(--muted); font-size: .95rem; margin-bottom: 14px; }
  .game-points { margin-top: 24px; display: grid; gap: 12px; }
  .game-points li { display: flex; gap: 10px; align-items: flex-start; font-size: .92rem; }
  .game-points .tick { color: var(--accent); font-weight: 700; }

  .features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 64px;
  }
  .feature {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 28px 24px;
    box-shadow: var(--shadow);
    transition: transform .2s, box-shadow .2s, border-color .2s;
  }
  .feature:hover { transform: translateY(-4px); border-color: rgba(37, 99, 235, .35); box-shadow: var(--shadow-hover); }
  .feature .icon {
    width: 46px; height: 46px;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(37, 99, 235, .12), rgba(124, 58, 237, .12));
    display: grid; place-items: center;
    font-size: 1.3rem;
    margin-bottom: 16px;
  }
  .feature h3 { font-size: 1.02rem; margin-bottom: 8px; }
  .feature p { font-size: .86rem; color: var(--muted); }

  /* ========== 关于我们 ========== */
  .about-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 64px;
    align-items: start;
  }
  .about-copy h2 { font-size: clamp(1.5rem, 3vw, 2.05rem); margin-bottom: 6px; letter-spacing: .02em; }
  .about-copy .sub { color: var(--accent); font-size: .85rem; letter-spacing: .3em; margin-bottom: 20px; font-weight: 600; }
  .about-copy p { color: var(--muted); font-size: .95rem; margin-bottom: 14px; }
  .about-copy .motto {
    margin-top: 24px;
    padding: 18px 22px;
    border-left: 3px solid var(--accent);
    background: #f5f8ff;
    border-radius: 0 12px 12px 0;
    font-size: .95rem;
    color: #33415e;
  }
  .info-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
  .info-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    transition: border-color .2s;
  }
  .info-card:hover { border-color: rgba(37, 99, 235, .35); }
  .info-card .label { font-size: .78rem; color: var(--muted); letter-spacing: .1em; }
  .info-card .value { font-size: 1.05rem; font-weight: 700; margin-top: 6px; }
  .info-card .desc { font-size: .78rem; color: var(--muted); margin-top: 4px; }
  .info-card.wide { grid-column: 1 / -1; }

  /* ========== 联系我们 ========== */
  .contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
  .contact-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 30px 24px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: border-color .2s, transform .2s, box-shadow .2s;
  }
  .contact-card:hover { border-color: rgba(37, 99, 235, .35); transform: translateY(-4px); box-shadow: var(--shadow-hover); }
  .contact-card .icon {
    width: 52px; height: 52px;
    margin: 0 auto 16px;
    border-radius: 14px;
    background: linear-gradient(135deg, rgba(37, 99, 235, .12), rgba(124, 58, 237, .12));
    display: grid; place-items: center;
    font-size: 1.4rem;
  }
  .contact-card h3 { font-size: 1rem; margin-bottom: 6px; }
  .contact-card p { font-size: .84rem; color: var(--muted); }
  .contact-card .mail { display: inline-block; margin-top: 10px; font-size: .86rem; color: var(--accent); }
  .contact-address {
    margin-top: 26px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
    color: var(--muted);
    font-size: .88rem;
  }

  /* ========== 页脚 ========== */
  .site-footer {
    border-top: 1px solid var(--line);
    background: #f7f9fd;
    padding: 68px 0 30px;
  }
  .footer-grid {
    display: grid;
    grid-template-columns: 1.8fr 1fr 1.3fr;
    gap: 40px;
    margin-bottom: 48px;
  }
  .footer-brand p { color: var(--muted); font-size: .84rem; margin-top: 14px; max-width: 320px; }
  .footer-col h4 { font-size: .9rem; margin-bottom: 16px; }
  .footer-col li { margin-bottom: 10px; }
  .footer-col a, .footer-col span { color: var(--muted); font-size: .84rem; transition: color .2s; }
  .footer-col a:hover { color: var(--accent); }
  .social-chips { display: flex; flex-wrap: wrap; gap: 10px; }
  .social-chips span {
    font-size: .78rem;
    padding: 6px 14px;
    border-radius: 999px;
    border: 1px solid var(--line);
    color: #4a5570;
    background: #fff;
  }
  .health-notice {
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 16px 20px;
    font-size: .74rem;
    color: var(--muted);
    text-align: center;
    line-height: 1.8;
    background: #fff;
  }
  .footer-bottom {
    margin-top: 26px;
    padding-top: 26px;
    border-top: 1px solid var(--line);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    font-size: .74rem;
    color: var(--muted);
  }
  .footer-bottom .links { display: flex; flex-wrap: wrap; gap: 16px; }
  .footer-bottom a { color: var(--muted); }
  .footer-bottom a:hover { color: var(--accent); }


  /* ========== 响应式 ========== */
  @media (max-width: 1024px) {
    .features-grid { grid-template-columns: repeat(2, 1fr); }
  }
  @media (max-width: 860px) {
    .nav-toggle { display: flex; }
    .nav-links {
      position: fixed;
      top: var(--header-h);
      left: 0; right: 0;
      flex-direction: column;
      align-items: stretch;
      gap: 0;
      background: rgba(255, 255, 255, .98);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--line);
      padding: 8px 28px 20px;
      display: none;
    }
    .nav-links.open { display: flex; }
    .nav-links a { padding: 13px 4px; border-bottom: 1px solid rgba(23, 32, 58, .06); }

    .section { padding: 72px 0; }
    .about-grid { grid-template-columns: 1fr; gap: 40px; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
    .footer-brand { grid-column: 1 / -1; }
  }
  @media (max-width: 520px) {
    .features-grid { grid-template-columns: 1fr; }
    .info-cards { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { justify-content: center; text-align: center; }
    .age-badge { width: 46px; height: 46px; font-size: .66rem; }
  }

  /* ========== 二级页横幅 ========== */
  .page-hero {
    position: relative;
    text-align: center;
    padding: calc(var(--header-h) + 72px) 0 60px;
    overflow: hidden;
    background: linear-gradient(180deg, #f3f7ff 0%, #fafbff 55%, #ffffff 100%);
  }
  .page-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
      radial-gradient(560px 360px at 18% 22%, rgba(37, 99, 235, .10), transparent 70%),
      radial-gradient(640px 440px at 82% 78%, rgba(124, 58, 237, .09), transparent 70%);
    pointer-events: none;
  }
  .page-hero .container { position: relative; z-index: 1; }
  .page-hero .kicker {
    display: inline-block;
    font-size: .8rem;
    letter-spacing: .35em;
    text-transform: uppercase;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 14px;
  }
  .page-hero h1 { font-size: clamp(1.9rem, 4vw, 2.7rem); font-weight: 800; letter-spacing: .03em; }
  .page-hero .desc { color: var(--muted); max-width: 560px; margin: 14px auto 0; font-size: .98rem; }

  /* ========== 三列卡片（价值观等） ========== */
  .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
  @media (max-width: 860px) { .grid-3 { grid-template-columns: 1fr; } }

  /* ========== 地址卡 ========== */
  .addr-box {
    max-width: 760px;
    margin: 0 auto;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 32px 36px;
    text-align: center;
  }
  .addr-box h3 { font-size: 1.05rem; margin-bottom: 8px; }
  .addr-box .addr { font-size: .95rem; color: var(--text); }
  .addr-box .note { font-size: .82rem; color: var(--muted); margin-top: 12px; }
  .info-card .value { overflow-wrap: anywhere; }

  /* ========== 法务/帮助文档 ========== */
  .legal-wrap { max-width: 860px; margin: 0 auto; }
  .legal-wrap h3 { font-size: 1.08rem; margin: 36px 0 12px; color: var(--text); }
  .legal-wrap h3:first-child { margin-top: 0; }
  .legal-wrap p { font-size: .92rem; color: var(--muted); margin-bottom: 10px; }
  .legal-wrap ul, .legal-wrap ol { padding-left: 24px; margin: 0 0 14px; }
  .legal-wrap ul { list-style: disc; }
  .legal-wrap ol { list-style: decimal; }
  .legal-wrap li { font-size: .92rem; color: var(--muted); margin-bottom: 6px; }
  .legal-wrap strong { color: var(--text); }
  .legal-wrap .update-info { font-size: .8rem; color: var(--muted); margin-top: 44px; padding-top: 18px; border-top: 1px solid var(--line); }

  /* ========== 客服 FAQ ========== */
  .faq-list { max-width: 860px; margin: 0 auto; display: grid; gap: 14px; }
  .faq-item { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 26px; box-shadow: var(--shadow); text-align: left; }
  .faq-item h3 { font-size: .98rem; margin-bottom: 8px; }
  .faq-item p { font-size: .88rem; color: var(--muted); }

  /* ========== 法务文档小节标题 ========== */
  .legal-wrap h4 { font-size: .98rem; margin: 24px 0 10px; color: var(--text); }