/* roulang page: index */
:root {
      --ink: #17233a;
      --ink-soft: #53617a;
      --paper: #f7f8fc;
      --white: #ffffff;
      --primary: #7457e8;
      --primary-deep: #5539c8;
      --coral: #ff6e78;
      --mint: #42bfa5;
      --gold: #ffbf4f;
      --line: #e5e8f2;
      --lavender: #f0edff;
      --shadow: 0 18px 48px rgba(35, 44, 88, .10);
      --shadow-hover: 0 22px 46px rgba(76, 58, 160, .18);
      --radius: 18px;
      --radius-sm: 11px;
      --container: 1180px;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
      font-size: 16px;
      line-height: 1.7;
    }
    a { color: inherit; text-decoration: none; }
    img { display: block; max-width: 100%; }
    button, input { font: inherit; }
    button { cursor: pointer; }
    :focus-visible {
      outline: 3px solid rgba(116, 87, 232, .35);
      outline-offset: 3px;
    }
    .container {
      width: min(calc(100% - 48px), var(--container));
      margin: 0 auto;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255, 255, 255, .91);
      border-bottom: 1px solid rgba(229, 232, 242, .85);
      backdrop-filter: blur(16px);
    }
    .topbar {
      min-height: 76px;
      display: flex;
      align-items: center;
      gap: 26px;
    }
    .brand {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      min-width: 0;
      color: var(--ink);
      font-size: 17px;
      font-weight: 800;
      letter-spacing: 0;
      line-height: 1.25;
    }
    .brand-mark {
      display: grid;
      width: 38px;
      height: 38px;
      flex: 0 0 38px;
      place-items: center;
      color: #fff;
      background: var(--primary);
      border-radius: 13px;
      box-shadow: 0 8px 18px rgba(116, 87, 232, .28);
    }
    .desktop-nav {
      display: flex;
      align-items: center;
      gap: 7px;
      margin-left: auto;
    }
    .nav-link {
      position: relative;
      padding: 10px 14px;
      color: var(--ink-soft);
      font-size: 15px;
      font-weight: 700;
      border-radius: 9px;
      transition: color .2s ease, background .2s ease;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary);
      background: var(--lavender);
    }
    .nav-mega { position: relative; }
    .mega-toggle {
      border: 0;
      background: transparent;
    }
    .mega-panel {
      position: absolute;
      top: calc(100% + 12px);
      right: 0;
      width: 350px;
      padding: 16px;
      visibility: hidden;
      opacity: 0;
      transform: translateY(-6px);
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: 16px;
      box-shadow: var(--shadow);
      transition: opacity .2s ease, transform .2s ease, visibility .2s ease;
    }
    .nav-mega:hover .mega-panel, .nav-mega:focus-within .mega-panel {
      visibility: visible;
      opacity: 1;
      transform: translateY(0);
    }
    .mega-caption {
      margin: 0 0 10px;
      color: var(--ink-soft);
      font-size: 12px;
      font-weight: 800;
    }
    .mega-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 9px;
    }
    .mega-item {
      display: flex;
      align-items: center;
      gap: 9px;
      padding: 11px;
      color: var(--ink);
      font-size: 14px;
      font-weight: 700;
      background: #fafaff;
      border: 1px solid transparent;
      border-radius: 10px;
      transition: background .2s ease, border-color .2s ease;
    }
    .mega-item:hover { background: var(--lavender); border-color: #dfd9ff; }
    .mega-item i { color: var(--primary); }
    .header-search {
      display: flex;
      align-items: center;
      width: 178px;
      padding: 0 12px;
      background: #f5f6fb;
      border: 1px solid transparent;
      border-radius: 10px;
      transition: border-color .2s ease, background .2s ease;
    }
    .header-search:focus-within { background: #fff; border-color: #cfc5ff; }
    .header-search i { color: #8d96ab; font-size: 13px; }
    .header-search input {
      width: 100%;
      padding: 10px 8px;
      color: var(--ink);
      font-size: 13px;
      background: transparent;
      border: 0;
      outline: 0;
    }
    .header-search input::placeholder { color: #9ca5b8; }
    .menu-button {
      display: none;
      width: 42px;
      height: 42px;
      margin-left: auto;
      color: var(--primary);
      background: var(--lavender);
      border: 0;
      border-radius: 10px;
    }
    .mobile-menu {
      display: none;
      padding: 0 0 17px;
      border-top: 1px solid var(--line);
    }
    .mobile-menu.open { display: block; }
    .mobile-menu a {
      display: block;
      padding: 12px 2px;
      color: var(--ink-soft);
      font-weight: 700;
      border-bottom: 1px solid var(--line);
    }

    .hero {
      position: relative;
      overflow: hidden;
      padding: 80px 0 68px;
      background: linear-gradient(135deg, #f2f0ff 0%, #f9f7ff 52%, #eefcf9 100%);
    }
    .hero::before, .hero::after {
      position: absolute;
      content: "";
      pointer-events: none;
      border-radius: 50%;
      opacity: .55;
    }
    .hero::before {
      width: 440px;
      height: 440px;
      top: -220px;
      left: -155px;
      background: rgba(255, 191, 79, .25);
    }
    .hero::after {
      width: 360px;
      height: 360px;
      right: -150px;
      bottom: -190px;
      background: rgba(116, 87, 232, .15);
    }
    .hero-grid {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: minmax(0, 1.05fr) minmax(380px, .95fr);
      align-items: center;
      gap: 56px;
    }
    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 17px;
      padding: 7px 11px;
      color: var(--primary-deep);
      font-size: 13px;
      font-weight: 800;
      line-height: 1;
      background: rgba(255, 255, 255, .72);
      border: 1px solid rgba(116, 87, 232, .16);
      border-radius: 999px;
    }
    .eyebrow i { color: var(--coral); }
    h1, h2, h3, p { margin-top: 0; }
    .hero h1 {
      max-width: 710px;
      margin-bottom: 18px;
      font-size: clamp(35px, 4vw, 58px);
      font-weight: 850;
      letter-spacing: 0;
      line-height: 1.17;
    }
    .hero h1 strong { color: var(--primary); font-weight: inherit; }
    .hero-copy {
      max-width: 610px;
      margin-bottom: 27px;
      color: var(--ink-soft);
      font-size: 17px;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-bottom: 29px;
    }
    .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 9px;
      margin: 0;
      padding: 13px 19px;
      color: #fff;
      font-size: 15px;
      font-weight: 800;
      line-height: 1.35;
      background: var(--primary);
      border: 1px solid var(--primary);
      border-radius: 11px;
      box-shadow: 0 10px 19px rgba(116, 87, 232, .22);
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .button:hover { color: #fff; background: var(--primary-deep); transform: translateY(-2px); box-shadow: 0 14px 24px rgba(116, 87, 232, .29); }
    .button:active { transform: translateY(0); }
    .button.secondary {
      color: var(--ink);
      background: rgba(255, 255, 255, .78);
      border-color: var(--line);
      box-shadow: none;
    }
    .button.secondary:hover { color: var(--primary); background: #fff; border-color: #d4ccff; }
    .hero-points {
      display: flex;
      flex-wrap: wrap;
      gap: 18px;
      padding: 0;
      margin: 0;
      list-style: none;
      color: var(--ink-soft);
      font-size: 13px;
      font-weight: 700;
    }
    .hero-points i { margin-right: 6px; color: var(--mint); }

    .showcase {
      position: relative;
      min-height: 385px;
    }
    .showcase-main {
      position: absolute;
      inset: 10px 0 0 24px;
      overflow: hidden;
      min-height: 360px;
      background: #26304e;
      border: 8px solid #fff;
      border-radius: 24px;
      box-shadow: 0 26px 45px rgba(45, 42, 99, .20);
    }
    .showcase-main::after {
      position: absolute;
      inset: 0;
      content: "";
      background: linear-gradient(180deg, transparent 30%, rgba(20, 25, 52, .78) 100%);
    }
    .showcase-main img {
      width: 100%;
      height: 100%;
      min-height: 360px;
      object-fit: cover;
      opacity: .88;
    }
    .showcase-copy {
      position: absolute;
      right: 25px;
      bottom: 22px;
      left: 25px;
      z-index: 1;
      color: #fff;
    }
    .showcase-copy span {
      display: inline-block;
      margin-bottom: 7px;
      padding: 4px 8px;
      color: #fff;
      font-size: 11px;
      font-weight: 800;
      background: rgba(255, 255, 255, .22);
      border-radius: 6px;
    }
    .showcase-copy strong { display: block; font-size: 22px; line-height: 1.25; }
    .floating-score {
      position: absolute;
      z-index: 2;
      top: -1px;
      left: 0;
      display: flex;
      align-items: center;
      gap: 8px;
      padding: 11px 14px;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 13px;
      box-shadow: var(--shadow);
    }
    .floating-score i { color: var(--gold); }
    .floating-score b { font-size: 15px; }
    .floating-score small { color: var(--ink-soft); font-size: 11px; }

    .section { padding: 82px 0; }
    .section-white { background: var(--white); }
    .section-head {
      display: flex;
      align-items: end;
      justify-content: space-between;
      gap: 24px;
      margin-bottom: 32px;
    }
    .section-kicker {
      margin-bottom: 8px;
      color: var(--primary);
      font-size: 13px;
      font-weight: 850;
    }
    .section-title {
      margin-bottom: 0;
      font-size: clamp(27px, 3.1vw, 40px);
      font-weight: 850;
      letter-spacing: 0;
      line-height: 1.25;
    }
    .section-intro {
      max-width: 450px;
      margin: 0;
      color: var(--ink-soft);
      font-size: 15px;
    }
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 18px;
    }
    .feature-card {
      padding: 27px 24px;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      box-shadow: 0 6px 18px rgba(31, 42, 83, .035);
      transition: transform .24s ease, box-shadow .24s ease, border-color .24s ease;
    }
    .feature-card:hover { border-color: #d4caff; transform: translateY(-5px); box-shadow: var(--shadow-hover); }
    .feature-icon {
      display: grid;
      width: 47px;
      height: 47px;
      margin-bottom: 18px;
      place-items: center;
      color: var(--primary);
      font-size: 20px;
      background: var(--lavender);
      border-radius: 14px;
    }
    .feature-card:nth-child(2) .feature-icon { color: #d95067; background: #fff0f2; }
    .feature-card:nth-child(3) .feature-icon { color: #198f79; background: #e9faf5; }
    .feature-card h3 { margin-bottom: 9px; font-size: 19px; font-weight: 800; }
    .feature-card p { margin-bottom: 0; color: var(--ink-soft); font-size: 14px; }

    .collection-layout {
      display: grid;
      grid-template-columns: .83fr 1.17fr;
      gap: 23px;
      align-items: stretch;
    }
    .collection-callout {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      min-height: 440px;
      padding: 36px;
      color: #fff;
      background: #272554;
      border-radius: var(--radius);
      box-shadow: var(--shadow);
    }
    .collection-callout .section-kicker { color: #c7baff; }
    .collection-callout h2 { margin-bottom: 16px; font-size: 35px; font-weight: 850; line-height: 1.2; }
    .collection-callout p { max-width: 400px; color: #d8d8ec; font-size: 15px; }
    .collection-callout .button { align-self: flex-start; color: var(--ink); background: #fff; border-color: #fff; box-shadow: none; }
    .collection-callout .button:hover { color: var(--primary); background: #f3f0ff; }
    .content-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 17px;
    }
    .media-card {
      position: relative;
      overflow: hidden;
      min-height: 212px;
      background: #31395c;
      border-radius: 15px;
      isolation: isolate;
      transition: transform .25s ease, box-shadow .25s ease;
    }
    .media-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
    .media-card::after {
      position: absolute;
      inset: 0;
      z-index: -1;
      content: "";
      background: linear-gradient(180deg, rgba(22, 28, 57, .02) 15%, rgba(19, 24, 53, .88) 100%);
    }
    .media-card img {
      position: absolute;
      inset: 0;
      z-index: -2;
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform .35s ease;
    }
    .media-card:hover img { transform: scale(1.06); }
    .media-body {
      position: absolute;
      right: 17px;
      bottom: 15px;
      left: 17px;
      color: #fff;
    }
    .media-body h3 { margin: 7px 0 2px; font-size: 18px; font-weight: 800; line-height: 1.25; }
    .media-body p { margin: 0; color: #e5e6ed; font-size: 12px; }
    .tag {
      display: inline-flex;
      align-items: center;
      gap: 5px;
      padding: 4px 8px;
      color: #fff;
      font-size: 11px;
      font-weight: 800;
      line-height: 1.1;
      background: rgba(255, 255, 255, .2);
      border: 1px solid rgba(255, 255, 255, .22);
      border-radius: 6px;
    }

    .topic-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 15px;
    }
    .topic-card {
      padding: 21px 18px;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 14px;
      transition: transform .2s ease, box-shadow .2s ease;
    }
    .topic-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
    .topic-no { display: block; margin-bottom: 24px; color: #b2a8ef; font-size: 12px; font-weight: 900; }
    .topic-card i { margin-bottom: 13px; color: var(--coral); font-size: 21px; }
    .topic-card h3 { margin-bottom: 4px; font-size: 17px; font-weight: 800; }
    .topic-card p { margin: 0; color: var(--ink-soft); font-size: 13px; }

    .insight-wrap {
      display: grid;
      grid-template-columns: 1.12fr .88fr;
      gap: 28px;
      align-items: center;
    }
    .insight-image {
      position: relative;
      min-height: 380px;
      overflow: hidden;
      border-radius: var(--radius);
      box-shadow: var(--shadow);
    }
    .insight-image img { width: 100%; height: 380px; object-fit: cover; }
    .image-note {
      position: absolute;
      right: 18px;
      bottom: 18px;
      left: 18px;
      padding: 15px 17px;
      color: #fff;
      background: rgba(28, 32, 61, .78);
      border: 1px solid rgba(255,255,255,.16);
      border-radius: 12px;
      backdrop-filter: blur(8px);
    }
    .image-note b { display: block; font-size: 15px; }
    .image-note span { color: #e2e3ef; font-size: 12px; }
    .insight-text h2 { margin-bottom: 16px; font-size: 36px; font-weight: 850; line-height: 1.25; }
    .insight-text > p { margin-bottom: 22px; color: var(--ink-soft); }
    .check-list { padding: 0; margin: 0; list-style: none; }
    .check-list li {
      display: flex;
      gap: 11px;
      padding: 11px 0;
      color: var(--ink);
      font-size: 15px;
      font-weight: 700;
      border-bottom: 1px solid var(--line);
    }
    .check-list i { padding-top: 5px; color: var(--mint); }
    .stats {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
      margin-top: 25px;
    }
    .stat {
      padding: 15px;
      background: #fafaff;
      border: 1px solid var(--line);
      border-radius: 11px;
    }
    .stat strong { display: block; color: var(--primary); font-size: 22px; line-height: 1.2; }
    .stat span { color: var(--ink-soft); font-size: 12px; font-weight: 700; }

    .steps {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 18px;
    }
    .step {
      position: relative;
      padding: 25px;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 15px;
    }
    .step-index {
      display: grid;
      width: 38px;
      height: 38px;
      margin-bottom: 17px;
      place-items: center;
      color: #fff;
      font-size: 14px;
      font-weight: 900;
      background: var(--primary);
      border-radius: 50%;
    }
    .step h3 { margin-bottom: 8px; font-size: 18px; font-weight: 800; }
    .step p { margin-bottom: 0; color: var(--ink-soft); font-size: 14px; }

    .faq-layout {
      display: grid;
      grid-template-columns: .75fr 1.25fr;
      gap: 62px;
      align-items: start;
    }
    .faq-intro p { color: var(--ink-soft); }
    .faq-chip {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 10px 12px;
      color: #a54c13;
      font-size: 13px;
      font-weight: 800;
      background: #fff5e6;
      border-radius: 9px;
    }
    .faq-list { display: grid; gap: 11px; }
    .faq-item {
      overflow: hidden;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 12px;
    }
    .faq-item summary {
      position: relative;
      padding: 18px 48px 18px 19px;
      color: var(--ink);
      font-size: 16px;
      font-weight: 800;
      cursor: pointer;
      list-style: none;
    }
    .faq-item summary::-webkit-details-marker { display: none; }
    .faq-item summary::after {
      position: absolute;
      top: 17px;
      right: 19px;
      display: grid;
      width: 25px;
      height: 25px;
      place-items: center;
      content: "+";
      color: var(--primary);
      font-size: 21px;
      font-weight: 400;
      background: var(--lavender);
      border-radius: 7px;
    }
    .faq-item[open] summary { color: var(--primary); }
    .faq-item[open] summary::after { content: "−"; }
    .faq-answer { padding: 0 19px 18px; color: var(--ink-soft); font-size: 14px; }

    .cta-section { padding: 0 0 82px; }
    .cta-box {
      position: relative;
      overflow: hidden;
      padding: 48px 52px;
      color: #fff;
      background: #5c45c6;
      border-radius: 22px;
      box-shadow: 0 23px 45px rgba(84, 57, 176, .24);
    }
    .cta-box::before {
      position: absolute;
      top: -110px;
      right: -50px;
      width: 310px;
      height: 310px;
      content: "";
      background: rgba(255,255,255,.10);
      border-radius: 50%;
    }
    .cta-box::after {
      position: absolute;
      bottom: -155px;
      left: 32%;
      width: 230px;
      height: 230px;
      content: "";
      background: rgba(255,191,79,.15);
      border-radius: 50%;
    }
    .cta-content {
      position: relative;
      z-index: 1;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 30px;
    }
    .cta-content h2 { margin-bottom: 9px; font-size: 33px; font-weight: 850; line-height: 1.25; }
    .cta-content p { max-width: 630px; margin: 0; color: #e8e5ff; }
    .cta-content .button { flex: 0 0 auto; color: var(--primary-deep); background: #fff; border-color: #fff; box-shadow: none; }
    .cta-content .button:hover { background: #f4f1ff; }

    .site-footer { color: #d9dced; background: #202541; }
    .footer-main {
      display: grid;
      grid-template-columns: 1.2fr .8fr;
      gap: 35px;
      padding: 52px 0 30px;
    }
    .footer-brand { color: #fff; }
    .footer-brand .brand-mark { background: var(--coral); box-shadow: none; }
    .footer-note { max-width: 560px; margin: 16px 0 0; color: #afb5cc; font-size: 14px; }
    .footer-links {
      display: flex;
      flex-wrap: wrap;
      align-content: flex-start;
      justify-content: flex-end;
      gap: 10px 22px;
      padding-top: 8px;
    }
    .footer-links a { color: #c7cbe0; font-size: 14px; font-weight: 700; transition: color .2s ease; }
    .footer-links a:hover { color: #fff; }
    .footer-bottom {
      display: flex;
      justify-content: space-between;
      gap: 18px;
      padding: 18px 0 25px;
      color: #929ab6;
      font-size: 12px;
      border-top: 1px solid rgba(255,255,255,.12);
    }

    @media (max-width: 1024px) {
      .header-search { display: none; }
      .hero-grid { grid-template-columns: 1fr .86fr; gap: 28px; }
      .collection-callout { padding: 28px; }
      .collection-callout h2 { font-size: 30px; }
      .faq-layout { gap: 35px; }
    }
    @media (max-width: 768px) {
      .container { width: min(calc(100% - 34px), var(--container)); }
      .topbar { min-height: 67px; }
      .brand { max-width: calc(100% - 62px); font-size: 14px; }
      .brand-mark { width: 34px; height: 34px; flex-basis: 34px; border-radius: 11px; }
      .desktop-nav { display: none; }
      .menu-button { display: grid; place-items: center; }
      .hero { padding: 55px 0 50px; }
      .hero-grid, .collection-layout, .insight-wrap, .faq-layout { grid-template-columns: 1fr; }
      .hero-grid { gap: 32px; }
      .showcase { min-height: 332px; max-width: 590px; width: 100%; margin: 0 auto; }
      .showcase-main, .showcase-main img { min-height: 315px; }
      .feature-grid { grid-template-columns: 1fr; }
      .topic-grid { grid-template-columns: repeat(2, 1fr); }
      .collection-callout { min-height: 300px; }
      .section { padding: 62px 0; }
      .section-head { display: block; margin-bottom: 24px; }
      .section-intro { margin-top: 12px; }
      .insight-image, .insight-image img { min-height: 320px; height: 320px; }
      .faq-layout { gap: 25px; }
      .cta-box { padding: 35px 29px; }
      .cta-content { display: block; }
      .cta-content .button { margin-top: 21px; }
      .footer-main { grid-template-columns: 1fr; gap: 21px; }
      .footer-links { justify-content: flex-start; padding-top: 0; }
    }
    @media (max-width: 520px) {
      .container { width: min(calc(100% - 28px), var(--container)); }
      .hero h1 { font-size: 34px; }
      .hero-copy { font-size: 15px; }
      .hero-actions { display: grid; grid-template-columns: 1fr; }
      .hero-actions .button { width: 100%; }
      .hero-points { display: grid; gap: 8px; }
      .showcase { min-height: 291px; }
      .showcase-main { inset: 8px 0 0 10px; min-height: 280px; border-width: 6px; }
      .showcase-main img { min-height: 280px; }
      .showcase-copy strong { font-size: 18px; }
      .floating-score { padding: 9px 11px; }
      .content-grid, .steps { grid-template-columns: 1fr; }
      .media-card { min-height: 198px; }
      .topic-grid { grid-template-columns: 1fr; }
      .stats { grid-template-columns: 1fr; }
      .section-title, .insight-text h2 { font-size: 28px; }
      .collection-callout { padding: 27px 23px; }
      .collection-callout h2 { font-size: 28px; }
      .cta-box { padding: 30px 23px; border-radius: 16px; }
      .cta-content h2 { font-size: 27px; }
      .footer-bottom { display: block; }
      .footer-bottom span + span { display: block; margin-top: 7px; }
    }