/* roulang page: index */
:root {
      --ink: #142238;
      --muted: #68778c;
      --blue: #2364d2;
      --blue-deep: #174aa5;
      --cyan: #2ca9c7;
      --paper: #f6f8fc;
      --white: #ffffff;
      --line: #e3e9f2;
      --soft-blue: #edf4ff;
      --soft-cyan: #eaf9fb;
      --radius-sm: 10px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --shadow-sm: 0 8px 24px rgba(27, 56, 96, .07);
      --shadow-md: 0 18px 46px rgba(27, 56, 96, .12);
      --ease: 180ms ease;
    }

    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      font-size: 16px;
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }
    a { color: inherit; text-decoration: none; }
    button, input { font: inherit; }
    button { cursor: pointer; }
    img { display: block; max-width: 100%; }
    :focus-visible {
      outline: 3px solid rgba(44, 169, 199, .42);
      outline-offset: 3px;
    }
    .wrap { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }
    .section { padding: 92px 0; }
    .section-head { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-bottom: 34px; }
    .eyebrow {
      display: inline-flex; align-items: center; gap: 8px;
      color: var(--blue); font-size: 13px; font-weight: 800;
      letter-spacing: .08em;
    }
    .eyebrow::before { content: ""; width: 22px; height: 2px; background: var(--cyan); }
    h1, h2, h3, p { margin-top: 0; }
    h1, h2, h3 { letter-spacing: -.025em; line-height: 1.25; }
    h1 { font-size: clamp(2.5rem, 5vw, 4.65rem); max-width: 730px; margin-bottom: 24px; }
    h2 { font-size: clamp(1.9rem, 3vw, 2.75rem); margin-bottom: 12px; }
    h3 { font-size: 1.13rem; margin-bottom: 8px; }
    .lead { color: var(--muted); font-size: 1.08rem; max-width: 690px; }
    .section-copy { color: var(--muted); max-width: 650px; margin-bottom: 0; }
    .topbar {
      position: sticky; top: 0; z-index: 30;
      background: rgba(246,248,252,.9); border-bottom: 1px solid rgba(227,233,242,.9);
      backdrop-filter: blur(16px);
    }
    .nav { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 25px; }
    .brand { display: inline-flex; align-items: center; gap: 11px; min-width: 0; font-weight: 900; }
    .brand-mark {
      width: 38px; height: 38px; flex: 0 0 38px; display: grid; place-items: center;
      color: white; background: var(--blue); border-radius: 12px; font-weight: 900;
      box-shadow: 0 7px 16px rgba(35,100,210,.22);
    }
    .brand-name { white-space: nowrap; font-size: .98rem; }
    .nav-links { display: flex; align-items: center; gap: 7px; }
    .nav-link {
      padding: 9px 14px; color: var(--muted); border-radius: 9px; font-size: .94rem;
      transition: var(--ease);
    }
    .nav-link:hover, .nav-link.active { color: var(--blue); background: var(--soft-blue); }
    .nav-actions { display: flex; align-items: center; gap: 12px; }
    .search {
      display: flex; align-items: center; gap: 8px; padding: 8px 12px;
      background: var(--white); border: 1px solid var(--line); border-radius: 10px;
    }
    .search input { width: 115px; border: 0; outline: 0; color: var(--ink); background: transparent; font-size: .88rem; }
    .search input::placeholder { color: #9aa6b7; }
    .btn {
      display: inline-flex; justify-content: center; align-items: center; gap: 8px;
      border: 1px solid transparent; border-radius: 10px; min-height: 44px;
      padding: 10px 18px; font-weight: 800; font-size: .94rem; transition: var(--ease);
    }
    .btn-primary { color: white; background: var(--blue); box-shadow: 0 8px 16px rgba(35,100,210,.2); }
    .btn-primary:hover { background: var(--blue-deep); transform: translateY(-2px); box-shadow: 0 12px 22px rgba(35,100,210,.28); }
    .btn-light { color: var(--blue); background: var(--white); border-color: var(--line); }
    .btn-light:hover { border-color: var(--blue); background: var(--soft-blue); }
    .menu-toggle { display: none; border: 0; background: transparent; color: var(--ink); padding: 8px; }

    .hero { padding: 62px 0 74px; background: var(--white); border-bottom: 1px solid var(--line); }
    .hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 72px; align-items: center; }
    .hero-copy { padding: 25px 0; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 30px 0 34px; }
    .creator {
      display: flex; align-items: center; gap: 14px; color: var(--muted); font-size: .9rem;
    }
    .avatar {
      width: 53px; height: 53px; display: grid; place-items: center; flex: 0 0 53px;
      border-radius: 50%; color: white; font-size: 1.25rem; font-weight: 900;
      background: linear-gradient(145deg, #2364d2, #36b3c7);
    }
    .creator strong { display: block; color: var(--ink); font-size: .98rem; }
    .hero-panel {
      position: relative; min-height: 370px; padding: 28px; border-radius: 28px;
      overflow: hidden; color: white; background: #122d58; box-shadow: var(--shadow-md);
    }
    .hero-panel::after {
      content: ""; position: absolute; right: -80px; bottom: -100px; width: 280px; height: 280px;
      border: 42px solid rgba(65,190,210,.2); border-radius: 50%;
    }
    .panel-top { display: flex; justify-content: space-between; align-items: center; position: relative; z-index: 1; }
    .panel-label { color: #a9c6ed; font-size: .8rem; letter-spacing: .1em; }
    .live-dot { display: inline-flex; align-items: center; gap: 7px; color: #b6f0e7; font-size: .82rem; }
    .live-dot::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: #55d7a7; box-shadow: 0 0 0 5px rgba(85,215,167,.14); }
    .panel-title { position: relative; z-index: 1; margin: 52px 0 24px; font-size: 2rem; max-width: 360px; }
    .panel-grid { position: relative; z-index: 1; display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; }
    .metric { padding: 13px; border: 1px solid rgba(255,255,255,.14); border-radius: 12px; background: rgba(255,255,255,.08); }
    .metric b { display: block; font-size: 1.35rem; line-height: 1.3; }
    .metric span { color: #aac2df; font-size: .75rem; }
    .strip { padding: 17px 0; background: #f0f5fb; border-bottom: 1px solid var(--line); }
    .strip-inner { display: flex; justify-content: space-between; align-items: center; gap: 18px; flex-wrap: wrap; }
    .strip strong { font-size: .93rem; }
    .trust-list { display: flex; gap: 22px; color: var(--muted); font-size: .86rem; }

    .vertical-section { background: #f7fbfc; }
    .vertical-grid { display: grid; grid-template-columns: .82fr 1.18fr; gap: 55px; align-items: center; }
    .poster {
      min-height: 390px; padding: 28px; display: flex; flex-direction: column; justify-content: space-between;
      color: white; border-radius: 22px; overflow: hidden; position: relative;
      background: linear-gradient(160deg, #1a6690 0%, #12305e 58%, #101e3d 100%);
      box-shadow: var(--shadow-md);
    }
    .poster::before, .poster::after { content: ""; position: absolute; border: 1px solid rgba(255,255,255,.2); border-radius: 50%; }
    .poster::before { width: 250px; height: 250px; right: -82px; top: 50px; }
    .poster::after { width: 390px; height: 390px; left: -200px; bottom: -230px; }
    .poster-content, .poster-bottom { position: relative; z-index: 1; }
    .poster-tag { display: inline-block; padding: 5px 10px; color: #c1f6f1; border: 1px solid rgba(193,246,241,.4); border-radius: 999px; font-size: .78rem; }
    .poster h3 { font-size: 2rem; max-width: 320px; margin-top: 115px; }
    .poster-bottom { display: flex; justify-content: space-between; align-items: end; color: #b8cee7; font-size: .83rem; }
    .feature-list { display: grid; gap: 13px; margin-top: 24px; }
    .feature-item { display: grid; grid-template-columns: 38px 1fr; gap: 13px; align-items: start; padding: 17px; background: var(--white); border: 1px solid var(--line); border-radius: 13px; transition: var(--ease); }
    .feature-item:hover { transform: translateX(4px); box-shadow: var(--shadow-sm); border-color: #bfd4f3; }
    .feature-icon { width: 38px; height: 38px; display: grid; place-items: center; color: var(--blue); background: var(--soft-blue); border-radius: 10px; font-weight: 900; }
    .feature-item p { margin: 0; color: var(--muted); font-size: .88rem; }

    .list-section { background: var(--white); }
    .hot-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .hot-card { padding: 21px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--white); box-shadow: var(--shadow-sm); transition: var(--ease); }
    .hot-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
    .rank { display: flex; justify-content: space-between; align-items: center; margin-bottom: 27px; color: var(--blue); font-size: .85rem; font-weight: 900; }
    .rank em { color: #d3a13d; font-size: 1.5rem; font-style: normal; }
    .hot-card p { min-height: 55px; color: var(--muted); font-size: .9rem; margin-bottom: 19px; }
    .tag { display: inline-flex; padding: 5px 9px; margin-right: 5px; color: #58708e; background: #f0f4f8; border-radius: 6px; font-size: .75rem; }

    .review-section { background: #eef4fb; }
    .review-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 20px; }
    .review-card { padding: 25px; background: var(--white); border-radius: var(--radius-md); border: 1px solid var(--line); }
    .review-card.large { grid-row: span 2; padding: 34px; background: #173968; color: white; }
    .stars { color: #f2bd54; letter-spacing: 3px; margin-bottom: 20px; }
    .review-text { font-size: 1.13rem; line-height: 1.8; }
    .review-card:not(.large) p { color: var(--muted); font-size: .9rem; }
    .review-user { display: flex; align-items: center; gap: 10px; margin-top: 22px; font-size: .85rem; }
    .mini-avatar { width: 31px; height: 31px; display: grid; place-items: center; color: var(--blue); background: var(--soft-blue); border-radius: 50%; font-weight: 800; }

    .news-section { background: var(--white); }
    .news-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 50px; }
    .news-list { border-top: 1px solid var(--line); }
    .news-item { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 19px 0; border-bottom: 1px solid var(--line); transition: var(--ease); }
    .news-item:hover { padding-left: 8px; color: var(--blue); }
    .news-item span { color: var(--muted); font-size: .82rem; white-space: nowrap; }
    .news-item strong { font-size: .96rem; font-weight: 700; }
    .news-aside { padding: 25px; border-radius: var(--radius-md); background: #f5f8fc; border: 1px solid var(--line); }
    .news-aside ul { list-style: none; padding: 0; margin: 20px 0 0; }
    .news-aside li { display: flex; gap: 10px; padding: 11px 0; color: var(--muted); font-size: .88rem; border-bottom: 1px dashed #d8e1ec; }
    .news-aside li::before { content: "•"; color: var(--cyan); font-size: 1.2rem; line-height: 1; }

    .faq-section { background: #f7f9fc; }
    .faq-list { max-width: 850px; margin: 0 auto; }
    details { background: var(--white); border: 1px solid var(--line); border-radius: 12px; margin-bottom: 12px; transition: var(--ease); }
    details[open] { border-color: #bcd1ef; box-shadow: var(--shadow-sm); }
    summary { display: flex; justify-content: space-between; gap: 20px; padding: 20px 23px; cursor: pointer; font-weight: 800; list-style: none; }
    summary::-webkit-details-marker { display: none; }
    summary::after { content: "+"; color: var(--blue); font-size: 1.25rem; font-weight: 400; }
    details[open] summary::after { content: "−"; }
    details p { padding: 0 23px 22px; margin: 0; color: var(--muted); font-size: .92rem; }

    .cta { padding: 65px 0; background: #2364d2; color: white; }
    .cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
    .cta h2 { margin-bottom: 10px; }
    .cta p { color: #d4e4ff; margin: 0; max-width: 630px; }
    .cta .btn-light { border-color: transparent; }

    footer { padding: 48px 0 25px; color: #9aa9bc; background: #122238; }
    .footer-main { display: flex; justify-content: space-between; gap: 40px; padding-bottom: 38px; border-bottom: 1px solid rgba(255,255,255,.12); }
    footer .brand { color: white; }
    footer .brand-mark { background: #2ca9c7; box-shadow: none; }
    .footer-note { max-width: 350px; margin-top: 16px; font-size: .85rem; line-height: 1.8; }
    .footer-links { display: flex; gap: 16px; align-items: start; }
    .footer-links a { padding: 7px 0; color: #c4cfdd; font-size: .88rem; }
    .footer-links a:hover { color: white; }
    .copyright { display: flex; justify-content: space-between; gap: 20px; padding-top: 20px; font-size: .78rem; }

    @media (max-width: 1024px) {
      .hero-grid { gap: 38px; }
      .vertical-grid { gap: 35px; }
      .wrap { width: min(100% - 32px, 960px); }
    }
    @media (max-width: 768px) {
      .nav-links, .nav-actions .search { display: none; }
      .menu-toggle { display: block; }
      .nav.menu-open .nav-links {
        display: flex; position: absolute; top: 70px; left: 16px; right: 16px;
        flex-direction: column; align-items: stretch; padding: 10px;
        background: var(--white); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow-md);
      }
      .nav.menu-open .nav-link { padding: 12px 14px; }
      .hero { padding: 40px 0 55px; }
      .hero-grid, .vertical-grid, .news-grid, .review-grid { grid-template-columns: 1fr; }
      .hero-panel { min-height: 320px; }
      .hot-grid { grid-template-columns: repeat(2, 1fr); }
      .review-card.large { grid-row: auto; }
      .cta-inner, .footer-main { flex-direction: column; align-items: flex-start; }
      .section { padding: 70px 0; }
      .section-head { display: block; }
      .section-head .btn { margin-top: 18px; }
    }
    @media (max-width: 520px) {
      .wrap { width: min(100% - 24px, 460px); }
      .brand-name { max-width: 190px; overflow: hidden; text-overflow: ellipsis; }
      h1 { font-size: 2.5rem; }
      .hero-actions, .hero-actions .btn { width: 100%; }
      .hero-actions .btn { min-height: 48px; }
      .panel-grid, .hot-grid { grid-template-columns: 1fr; }
      .metric { display: flex; justify-content: space-between; align-items: center; }
      .poster { min-height: 330px; }
      .poster h3 { margin-top: 80px; }
      .trust-list { width: 100%; flex-wrap: wrap; gap: 7px 16px; }
      .news-item { align-items: start; }
      .news-item strong { font-size: .89rem; }
      .news-item span { font-size: .74rem; }
      .footer-links { flex-wrap: wrap; gap: 13px 23px; }
      .copyright { display: block; }
      .copyright span { display: block; margin-bottom: 7px; }
    }