/* roulang page: index */
:root {
      --ink: #182b3a;
      --ink-soft: #314a5d;
      --muted: #63798a;
      --blue: #1769a6;
      --blue-deep: #124c76;
      --blue-pale: #eaf3f9;
      --teal: #278376;
      --teal-pale: #e9f5f2;
      --coral: #bd6255;
      --coral-pale: #fbefec;
      --green: #28755e;
      --surface: #ffffff;
      --page: #f5f9fc;
      --line: #dce6ed;
      --line-strong: #cad8e2;
      --shadow: 0 12px 34px rgba(26, 57, 79, 0.08);
      --shadow-hover: 0 18px 42px rgba(26, 57, 79, 0.14);
      --radius: 8px;
      --radius-sm: 5px;
      --container: 1200px;
      --transition: 180ms ease;
    }

    *,
    *::before,
    *::after {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
      scroll-padding-top: 88px;
    }

    body {
      margin: 0;
      color: var(--ink);
      background: var(--page);
      font-family: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
      font-size: 16px;
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeLegibility;
    }

    img {
      display: block;
      max-width: 100%;
    }

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

    button,
    input {
      color: inherit;
      font: inherit;
    }

    button {
      cursor: pointer;
    }

    a:focus-visible,
    button:focus-visible,
    input:focus-visible,
    summary:focus-visible {
      outline: 3px solid rgba(23, 105, 166, 0.36);
      outline-offset: 3px;
    }

    .container {
      width: min(var(--container), calc(100% - 48px));
      margin-inline: auto;
    }

    .site-header {
      position: sticky;
      z-index: 50;
      top: 0;
      border-bottom: 1px solid rgba(204, 220, 231, 0.86);
      background: rgba(255, 255, 255, 0.96);
      box-shadow: 0 3px 18px rgba(28, 56, 75, 0.035);
      backdrop-filter: blur(12px);
    }

    .header-inner {
      display: flex;
      min-height: 76px;
      align-items: center;
      justify-content: space-between;
      gap: 28px;
    }

    .brand {
      display: inline-flex;
      min-width: 0;
      align-items: center;
      gap: 11px;
      color: var(--ink);
      font-weight: 800;
    }

    .brand-mark {
      display: grid;
      width: 42px;
      height: 42px;
      flex: 0 0 42px;
      place-items: center;
      border-radius: 7px;
      color: #fff;
      background: var(--blue-deep);
      font-size: 14px;
      line-height: 1;
    }

    .brand-name {
      max-width: 260px;
      font-size: 16px;
      line-height: 1.35;
    }

    .main-nav {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 4px;
    }

    .main-nav a {
      position: relative;
      display: inline-flex;
      min-height: 42px;
      align-items: center;
      padding: 0 12px;
      border-radius: 5px;
      color: var(--ink-soft);
      font-size: 14px;
      font-weight: 650;
      white-space: nowrap;
      transition: color var(--transition), background var(--transition);
    }

    .main-nav a:hover,
    .main-nav a:focus-visible {
      color: var(--blue-deep);
      background: var(--blue-pale);
    }

    .main-nav a[aria-current="page"] {
      color: var(--blue-deep);
      background: #e8f2f8;
    }

    .menu-toggle {
      display: none;
      width: 42px;
      height: 42px;
      align-items: center;
      justify-content: center;
      border: 1px solid var(--line);
      border-radius: 6px;
      background: var(--surface);
    }

    .menu-toggle span,
    .menu-toggle::before,
    .menu-toggle::after {
      position: absolute;
      width: 18px;
      height: 2px;
      border-radius: 2px;
      background: var(--ink-soft);
      content: "";
      transition: transform var(--transition), opacity var(--transition);
    }

    .menu-toggle::before {
      transform: translateY(-6px);
    }

    .menu-toggle::after {
      transform: translateY(6px);
    }

    .menu-toggle[aria-expanded="true"] span {
      opacity: 0;
    }

    .menu-toggle[aria-expanded="true"]::before {
      transform: rotate(45deg);
    }

    .menu-toggle[aria-expanded="true"]::after {
      transform: rotate(-45deg);
    }

    .hero {
      position: relative;
      display: flex;
      min-height: 650px;
      align-items: center;
      overflow: hidden;
      isolation: isolate;
      color: #fff;
      background: #17374e;
    }

    .hero-media,
    .hero-shade {
      position: absolute;
      z-index: -1;
      inset: 0;
    }

    .hero-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      object-position: center 38%;
    }

    .hero-shade {
      background: rgba(10, 29, 44, 0.55);
    }

    .hero-content {
      position: relative;
      width: min(var(--container), calc(100% - 48px));
      margin-inline: auto;
      padding: 82px 0 90px;
    }

    .profile-line {
      display: flex;
      align-items: center;
      gap: 13px;
      margin-bottom: 25px;
    }

    .profile-mark {
      display: grid;
      width: 54px;
      height: 54px;
      flex: 0 0 54px;
      place-items: center;
      border: 2px solid rgba(255, 255, 255, 0.82);
      border-radius: 50%;
      color: var(--blue-deep);
      background: #fff;
      font-size: 15px;
      font-weight: 850;
    }

    .profile-copy {
      display: grid;
      gap: 2px;
    }

    .profile-copy strong {
      font-size: 17px;
      line-height: 1.35;
    }

    .profile-copy span {
      color: rgba(255, 255, 255, 0.8);
      font-size: 13px;
    }

    .hero-label {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 17px;
      color: #d8ecf7;
      font-size: 13px;
      font-weight: 750;
      letter-spacing: 0;
    }

    .hero-label::before {
      width: 25px;
      height: 2px;
      background: #78c4b7;
      content: "";
    }

    .hero h1 {
      max-width: 940px;
      margin: 0;
      color: #fff;
      font-size: 48px;
      font-weight: 820;
      line-height: 1.24;
      text-shadow: 0 2px 12px rgba(0, 0, 0, 0.28);
    }

    .hero h1 span {
      color: #a9dfd3;
    }

    .hero-copy {
      max-width: 790px;
      margin: 20px 0 0;
      color: rgba(255, 255, 255, 0.9);
      font-size: 17px;
      line-height: 1.9;
    }

    .hero-badges {
      display: flex;
      flex-wrap: wrap;
      gap: 9px;
      margin-top: 24px;
    }

    .hero-badge {
      display: inline-flex;
      min-height: 32px;
      align-items: center;
      padding: 4px 11px;
      border: 1px solid rgba(255, 255, 255, 0.35);
      border-radius: 4px;
      color: #f5fbff;
      background: rgba(12, 33, 49, 0.35);
      font-size: 12px;
      font-weight: 650;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 30px;
    }

    .button {
      display: inline-flex;
      min-height: 48px;
      align-items: center;
      justify-content: center;
      gap: 9px;
      padding: 0 19px;
      border: 1px solid transparent;
      border-radius: 5px;
      font-size: 14px;
      font-weight: 750;
      transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition);
    }

    .button:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(15, 50, 73, 0.16);
    }

    .button:active {
      transform: translateY(0);
    }

    .button-primary {
      color: #fff;
      background: var(--blue);
    }

    .button-primary:hover {
      background: var(--blue-deep);
    }

    .button-light {
      border-color: rgba(255, 255, 255, 0.7);
      color: #fff;
      background: rgba(15, 39, 57, 0.22);
    }

    .button-light:hover {
      background: rgba(255, 255, 255, 0.16);
    }

    .button-outline {
      border-color: var(--line-strong);
      color: var(--blue-deep);
      background: #fff;
    }

    .button-outline:hover {
      border-color: var(--blue);
      background: var(--blue-pale);
    }

    .section {
      padding: 82px 0;
      border-bottom: 1px solid var(--line);
      background: var(--surface);
    }

    .section-soft {
      background: #f2f7fa;
    }

    .section-blue {
      background: var(--blue-pale);
    }

    .section-dark {
      color: #eef6fb;
      border-bottom-color: #27465c;
      background: #19394f;
    }

    .section-heading {
      display: flex;
      align-items: flex-end;
      justify-content: space-between;
      gap: 30px;
      margin-bottom: 34px;
    }

    .section-heading-main {
      max-width: 760px;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 10px;
      color: var(--teal);
      font-size: 12px;
      font-weight: 800;
    }

    .eyebrow::before {
      width: 21px;
      height: 2px;
      background: currentColor;
      content: "";
    }

    .section-dark .eyebrow {
      color: #8ed2c5;
    }

    .section-title {
      margin: 0;
      color: var(--ink);
      font-size: 31px;
      font-weight: 800;
      line-height: 1.32;
    }

    .section-dark .section-title {
      color: #fff;
    }

    .section-intro {
      max-width: 790px;
      margin: 12px 0 0;
      color: var(--muted);
      font-size: 15px;
      line-height: 1.85;
    }

    .section-dark .section-intro {
      color: #c3d5df;
    }

    .text-link {
      display: inline-flex;
      flex: 0 0 auto;
      align-items: center;
      gap: 8px;
      color: var(--blue-deep);
      font-size: 14px;
      font-weight: 750;
    }

    .text-link::after {
      content: "→";
      transition: transform var(--transition);
    }

    .text-link:hover::after {
      transform: translateX(4px);
    }

    .intro-band {
      display: grid;
      grid-template-columns: 0.8fr 1.2fr;
      align-items: start;
      gap: 54px;
    }

    .intro-band .section-title {
      max-width: 440px;
    }

    .intro-copy {
      padding-left: 26px;
      border-left: 3px solid #85b9d6;
      color: var(--ink-soft);
      font-size: 17px;
      line-height: 1.95;
    }

    .intro-copy p {
      margin: 0;
    }

    .intro-note {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      margin-top: 22px;
      padding: 15px 17px;
      border: 1px solid #d0e1eb;
      border-radius: var(--radius-sm);
      color: #38556a;
      background: #f5fafc;
      font-size: 13px;
      line-height: 1.75;
    }

    .note-mark {
      display: grid;
      width: 25px;
      height: 25px;
      flex: 0 0 25px;
      place-items: center;
      border-radius: 50%;
      color: var(--blue-deep);
      background: #dcecf5;
      font-size: 14px;
      font-weight: 800;
    }

    .category-grid {
      display: grid;
      grid-template-columns: repeat(5, minmax(0, 1fr));
      gap: 13px;
    }

    .category-item {
      position: relative;
      min-height: 210px;
      padding: 23px 20px;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: #fff;
      box-shadow: 0 6px 20px rgba(30, 63, 83, 0.045);
      transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
    }

    .category-item:hover {
      transform: translateY(-4px);
      border-color: #b3d0e1;
      box-shadow: var(--shadow);
    }

    .category-index {
      display: inline-grid;
      width: 34px;
      height: 34px;
      place-items: center;
      margin-bottom: 18px;
      border-radius: 5px;
      color: var(--blue-deep);
      background: var(--blue-pale);
      font-size: 13px;
      font-weight: 800;
    }

    .category-item:nth-child(2n) .category-index {
      color: var(--teal);
      background: var(--teal-pale);
    }

    .category-item h3 {
      margin: 0 0 9px;
      font-size: 16px;
      line-height: 1.45;
    }

    .category-item p {
      margin: 0;
      color: var(--muted);
      font-size: 13px;
      line-height: 1.75;
    }

    .category-foot {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      margin-top: 25px;
      padding-top: 20px;
      border-top: 1px solid var(--line);
      color: var(--muted);
      font-size: 13px;
    }

    .search-form {
      display: flex;
      width: min(360px, 100%);
      align-items: center;
      gap: 8px;
      padding: 5px;
      border: 1px solid var(--line-strong);
      border-radius: 5px;
      background: #fff;
      transition: border-color var(--transition), box-shadow var(--transition);
    }

    .search-form:focus-within {
      border-color: var(--blue);
      box-shadow: 0 0 0 3px rgba(23, 105, 166, 0.12);
    }

    .search-form input {
      width: 100%;
      min-width: 0;
      height: 36px;
      padding: 0 9px;
      border: 0;
      outline: 0;
      color: var(--ink);
      background: transparent;
      font-size: 13px;
    }

    .search-form input::placeholder {
      color: #8294a1;
    }

    .search-form button {
      display: grid;
      width: 37px;
      height: 36px;
      flex: 0 0 37px;
      place-items: center;
      border: 0;
      border-radius: 4px;
      color: #fff;
      background: var(--blue);
      font-size: 19px;
      line-height: 1;
      transition: background var(--transition);
    }

    .search-form button:hover {
      background: var(--blue-deep);
    }

    .content-grid {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 18px;
    }

    .content-card {
      min-width: 0;
      overflow: hidden;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: #fff;
      box-shadow: 0 5px 18px rgba(30, 63, 83, 0.05);
      transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    }

    .content-card:hover {
      transform: translateY(-4px);
      border-color: #bfd4e1;
      box-shadow: var(--shadow-hover);
    }

    .card-image {
      position: relative;
      aspect-ratio: 1.46 / 1;
      overflow: hidden;
      background: #d9e6ee;
    }

    .card-image img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 400ms ease;
    }

    .content-card:hover .card-image img {
      transform: scale(1.035);
    }

    .card-tag {
      position: absolute;
      top: 12px;
      left: 12px;
      display: inline-flex;
      min-height: 25px;
      align-items: center;
      padding: 3px 8px;
      border: 1px solid rgba(255, 255, 255, 0.72);
      border-radius: 3px;
      color: #fff;
      background: rgba(22, 57, 78, 0.82);
      font-size: 11px;
      font-weight: 750;
    }

    .card-body {
      padding: 17px 17px 19px;
    }

    .card-body h3 {
      margin: 0;
      color: var(--ink);
      font-size: 16px;
      font-weight: 780;
      line-height: 1.5;
    }

    .card-body p {
      margin: 9px 0 0;
      color: var(--muted);
      font-size: 13px;
      line-height: 1.75;
    }

    .card-meta {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 10px;
      margin-top: 15px;
      padding-top: 12px;
      border-top: 1px solid #edf1f4;
      color: #718391;
      font-size: 11px;
      font-weight: 650;
    }

    .card-meta span:last-child {
      color: var(--teal);
    }

    .empty-state {
      display: none;
      margin-top: 18px;
      padding: 18px;
      border: 1px dashed var(--line-strong);
      border-radius: var(--radius-sm);
      color: var(--muted);
      text-align: center;
      background: #fff;
    }

    .featured-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 18px;
    }

    .featured-card {
      display: grid;
      grid-template-columns: 120px 1fr;
      min-height: 148px;
      overflow: hidden;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: #fff;
      transition: transform var(--transition), box-shadow var(--transition);
    }

    .featured-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow);
    }

    .featured-card img {
      width: 120px;
      height: 100%;
      min-height: 148px;
      object-fit: cover;
    }

    .featured-copy {
      padding: 16px 16px 15px;
    }

    .featured-copy .card-kicker {
      color: var(--teal);
      font-size: 11px;
      font-weight: 800;
    }

    .featured-copy h3 {
      margin: 5px 0 7px;
      font-size: 15px;
      line-height: 1.45;
    }

    .featured-copy p {
      margin: 0;
      color: var(--muted);
      font-size: 12px;
      line-height: 1.7;
    }

    .spec-layout {
      display: grid;
      grid-template-columns: 0.8fr 1.2fr;
      gap: 54px;
      align-items: start;
    }

    .spec-aside {
      padding: 28px;
      border-radius: var(--radius);
      color: #fff;
      background: var(--blue-deep);
    }

    .spec-aside .aside-label {
      display: inline-block;
      margin-bottom: 15px;
      color: #a8dfd3;
      font-size: 12px;
      font-weight: 800;
    }

    .spec-aside h3 {
      margin: 0;
      font-size: 24px;
      line-height: 1.45;
    }

    .spec-aside p {
      margin: 13px 0 0;
      color: #d0e3ed;
      font-size: 14px;
      line-height: 1.85;
    }

    .spec-list {
      margin: 0;
      border-top: 1px solid var(--line-strong);
    }

    .spec-row {
      display: grid;
      grid-template-columns: 170px 1fr;
      gap: 20px;
      padding: 17px 0;
      border-bottom: 1px solid var(--line);
    }

    .spec-row dt {
      color: var(--ink-soft);
      font-size: 14px;
      font-weight: 750;
    }

    .spec-row dd {
      margin: 0;
      color: var(--muted);
      font-size: 14px;
      line-height: 1.7;
    }

    .principle-grid {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 15px;
      margin-top: 34px;
    }

    .principle {
      min-height: 185px;
      padding: 22px 20px;
      border: 1px solid rgba(224, 239, 246, 0.18);
      border-radius: var(--radius);
      background: rgba(255, 255, 255, 0.055);
    }

    .principle-number {
      display: inline-block;
      margin-bottom: 18px;
      color: #8bd2c2;
      font-size: 12px;
      font-weight: 800;
    }

    .principle h3 {
      margin: 0 0 8px;
      color: #fff;
      font-size: 16px;
    }

    .principle p {
      margin: 0;
      color: #c2d4de;
      font-size: 13px;
      line-height: 1.75;
    }

    .flow-list {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 0;
      margin-top: 34px;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: #fff;
      box-shadow: 0 6px 20px rgba(30, 63, 83, 0.045);
    }

    .flow-step {
      position: relative;
      min-height: 210px;
      padding: 25px 22px;
    }

    .flow-step + .flow-step {
      border-left: 1px solid var(--line);
    }

    .flow-step:not(:last-child)::after {
      position: absolute;
      z-index: 1;
      top: 38px;
      right: -7px;
      width: 13px;
      height: 13px;
      border-top: 2px solid #8ba7b8;
      border-right: 2px solid #8ba7b8;
      background: #fff;
      content: "";
      transform: rotate(45deg);
    }

    .flow-count {
      display: grid;
      width: 35px;
      height: 35px;
      place-items: center;
      margin-bottom: 20px;
      border-radius: 50%;
      color: var(--blue-deep);
      background: #e5f0f6;
      font-size: 13px;
      font-weight: 850;
    }

    .flow-step h3 {
      margin: 0 0 8px;
      font-size: 16px;
    }

    .flow-step p {
      margin: 0;
      color: var(--muted);
      font-size: 13px;
      line-height: 1.75;
    }

    .index-layout {
      display: grid;
      grid-template-columns: 0.7fr 1.3fr;
      gap: 50px;
      align-items: center;
    }

    .index-aside {
      padding-right: 27px;
      border-right: 1px solid #cedee7;
    }

    .index-aside .section-title {
      max-width: 410px;
    }

    .index-aside p {
      margin: 15px 0 0;
      color: var(--muted);
      font-size: 14px;
      line-height: 1.85;
    }

    .index-list {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 0 24px;
      margin: 0;
      padding: 0;
      list-style: none;
      counter-reset: topic;
    }

    .index-list li {
      display: flex;
      min-height: 57px;
      align-items: center;
      gap: 13px;
      border-bottom: 1px solid #d9e5eb;
      color: var(--ink-soft);
      font-size: 14px;
      font-weight: 650;
      counter-increment: topic;
    }

    .index-list li::before {
      display: grid;
      width: 27px;
      height: 27px;
      flex: 0 0 27px;
      place-items: center;
      border-radius: 4px;
      color: var(--blue-deep);
      background: #deedf5;
      content: counter(topic, decimal-leading-zero);
      font-size: 10px;
      font-weight: 850;
    }

    .news-list {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 14px;
    }

    .news-item {
      display: grid;
      grid-template-columns: 116px 1fr;
      min-height: 118px;
      overflow: hidden;
      border: 1px solid var(--line);
      border-radius: var(--radius-sm);
      background: #fff;
      transition: border-color var(--transition), box-shadow var(--transition);
    }

    .news-item:hover {
      border-color: #bdd2df;
      box-shadow: 0 8px 20px rgba(30, 63, 83, 0.08);
    }

    .news-item img {
      width: 116px;
      height: 100%;
      min-height: 118px;
      object-fit: cover;
    }

    .news-copy {
      padding: 14px 15px;
    }

    .news-copy time {
      color: var(--teal);
      font-size: 11px;
      font-weight: 800;
    }

    .news-copy h3 {
      margin: 5px 0 0;
      font-size: 14px;
      line-height: 1.5;
    }

    .news-copy p {
      margin: 6px 0 0;
      color: var(--muted);
      font-size: 12px;
      line-height: 1.65;
    }

    .faq-list {
      display: grid;
      gap: 10px;
      max-width: 940px;
    }

    .faq-item {
      overflow: hidden;
      border: 1px solid var(--line);
      border-radius: var(--radius-sm);
      background: #fff;
      transition: border-color var(--transition), box-shadow var(--transition);
    }

    .faq-item[open] {
      border-color: #bbd2df;
      box-shadow: 0 7px 18px rgba(30, 63, 83, 0.06);
    }

    .faq-item summary {
      position: relative;
      display: flex;
      min-height: 62px;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      padding: 16px 20px;
      color: var(--ink);
      font-size: 15px;
      font-weight: 750;
      cursor: pointer;
      list-style: none;
    }

    .faq-item summary::-webkit-details-marker {
      display: none;
    }

    .faq-item summary::after {
      display: grid;
      width: 27px;
      height: 27px;
      flex: 0 0 27px;
      place-items: center;
      border-radius: 4px;
      color: var(--blue-deep);
      background: var(--blue-pale);
      content: "+";
      font-size: 19px;
      line-height: 1;
    }

    .faq-item[open] summary::after {
      content: "−";
    }

    .faq-answer {
      max-width: 840px;
      padding: 0 20px 19px;
      color: var(--muted);
      font-size: 14px;
      line-height: 1.85;
    }

    .contact-band {
      display: grid;
      grid-template-columns: 1fr auto;
      align-items: center;
      gap: 35px;
      padding: 34px 38px;
      border: 1px solid #d5e4ed;
      border-radius: var(--radius);
      background: #fff;
      box-shadow: var(--shadow);
    }

    .contact-band h2 {
      margin: 0;
      color: var(--ink);
      font-size: 23px;
      line-height: 1.4;
    }

    .contact-band p {
      max-width: 710px;
      margin: 9px 0 0;
      color: var(--muted);
      font-size: 14px;
      line-height: 1.8;
    }

    .site-footer {
      padding: 52px 0 22px;
      color: #d6e3eb;
      background: #142f43;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 38px;
      padding-bottom: 36px;
    }

    .footer-brand {
      display: flex;
      align-items: center;
      gap: 11px;
      color: #fff;
      font-size: 16px;
      font-weight: 800;
      line-height: 1.4;
    }

    .footer-brand .brand-mark {
      width: 39px;
      height: 39px;
      flex-basis: 39px;
      color: var(--blue-deep);
      background: #cbe7e0;
    }

    .footer-intro {
      max-width: 330px;
      margin: 17px 0 0;
      color: #adc1ce;
      font-size: 13px;
      line-height: 1.85;
    }

    .footer-column h2 {
      margin: 2px 0 14px;
      color: #fff;
      font-size: 14px;
      font-weight: 750;
    }

    .footer-links {
      display: grid;
      gap: 9px;
      margin: 0;
      padding: 0;
      list-style: none;
    }

    .footer-links a {
      color: #b9ccd7;
      font-size: 13px;
      transition: color var(--transition);
    }

    .footer-links a:hover {
      color: #fff;
    }

    .footer-bottom {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      padding-top: 18px;
      border-top: 1px solid rgba(211, 230, 240, 0.16);
      color: #9cb2c0;
      font-size: 12px;
    }

    .footer-bottom a {
      color: #c2d7e2;
    }

    .age-gate {
      position: fixed;
      z-index: 100;
      inset: 0;
      display: grid;
      place-items: center;
      padding: 24px;
      background: rgba(10, 25, 36, 0.78);
      backdrop-filter: blur(8px);
    }

    .age-gate[hidden] {
      display: none;
    }

    .age-panel {
      width: min(520px, 100%);
      padding: 36px;
      border: 1px solid #dce7ed;
      border-radius: 8px;
      background: #fff;
      box-shadow: 0 24px 70px rgba(0, 0, 0, 0.24);
      text-align: center;
    }

    .age-mark {
      display: grid;
      width: 58px;
      height: 58px;
      place-items: center;
      margin: 0 auto 18px;
      border-radius: 50%;
      color: #fff;
      background: var(--blue-deep);
      font-size: 17px;
      font-weight: 850;
    }

    .age-panel h2 {
      margin: 0;
      color: var(--ink);
      font-size: 24px;
      line-height: 1.45;
    }

    .age-panel p {
      margin: 13px 0 22px;
      color: var(--muted);
      font-size: 14px;
      line-height: 1.8;
    }

    .age-panel .button {
      width: 100%;
    }

    .age-exit-note {
      display: block;
      margin-top: 15px;
      color: #788b98;
      font-size: 12px;
    }

    .noscript-note {
      margin: 0;
      padding: 12px 20px;
      color: #453e22;
      background: #fff3cd;
      text-align: center;
      font-size: 13px;
    }

    @media (max-width: 1024px) {
      .main-nav {
        gap: 0;
      }

      .main-nav a {
        padding-inline: 9px;
        font-size: 13px;
      }

      .hero {
        min-height: 620px;
      }

      .hero h1 {
        max-width: 820px;
        font-size: 43px;
      }

      .category-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
      }

      .content-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
      }

      .featured-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .principle-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .footer-grid {
        grid-template-columns: 1.3fr 1fr 1fr;
      }

      .footer-column:last-child {
        grid-column: 2 / 4;
      }
    }

    @media (max-width: 768px) {
      html {
        scroll-padding-top: 75px;
      }

      .container {
        width: min(100% - 36px, var(--container));
      }

      .header-inner {
        min-height: 68px;
        gap: 12px;
      }

      .brand-mark {
        width: 39px;
        height: 39px;
        flex-basis: 39px;
      }

      .brand-name {
        max-width: 240px;
        font-size: 14px;
      }

      .menu-toggle {
        position: relative;
        display: inline-flex;
        flex: 0 0 42px;
      }

      .main-nav {
        position: absolute;
        top: calc(100% + 1px);
        right: 0;
        left: 0;
        display: none;
        flex-direction: column;
        align-items: stretch;
        padding: 10px 18px 16px;
        border-bottom: 1px solid var(--line);
        background: #fff;
        box-shadow: 0 15px 22px rgba(25, 50, 68, 0.1);
      }

      .main-nav.is-open {
        display: flex;
      }

      .main-nav a {
        min-height: 46px;
        padding: 0 12px;
        font-size: 14px;
      }

      .hero {
        min-height: 610px;
      }

      .hero-content {
        width: min(100% - 36px, var(--container));
        padding: 74px 0 76px;
      }

      .hero-media img {
        object-position: 57% center;
      }

      .hero h1 {
        max-width: 680px;
        font-size: 38px;
      }

      .hero-copy {
        max-width: 650px;
        font-size: 15px;
      }

      .section {
        padding: 66px 0;
      }

      .section-heading {
        align-items: flex-start;
        flex-direction: column;
        gap: 18px;
        margin-bottom: 28px;
      }

      .section-title {
        font-size: 27px;
      }

      .intro-band,
      .spec-layout,
      .index-layout {
        grid-template-columns: 1fr;
        gap: 28px;
      }

      .intro-copy {
        padding-left: 18px;
        font-size: 15px;
      }

      .category-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .content-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 14px;
      }

      .card-body {
        padding: 15px;
      }

      .featured-grid {
        grid-template-columns: 1fr;
      }

      .featured-card {
        grid-template-columns: 138px 1fr;
      }

      .featured-card img {
        width: 138px;
      }

      .spec-aside {
        padding: 24px;
      }

      .flow-list {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .flow-step:nth-child(3) {
        border-top: 1px solid var(--line);
        border-left: 0;
      }

      .flow-step:nth-child(4) {
        border-top: 1px solid var(--line);
      }

      .flow-step:nth-child(2)::after {
        display: none;
      }

      .index-aside {
        padding-right: 0;
        padding-bottom: 22px;
        border-right: 0;
        border-bottom: 1px solid #cedee7;
      }

      .news-list {
        grid-template-columns: 1fr;
      }

      .contact-band {
        grid-template-columns: 1fr;
        padding: 28px;
      }

      .contact-band .button {
        justify-self: start;
      }

      .footer-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 30px 24px;
      }

      .footer-column:last-child {
        grid-column: auto;
      }
    }

    @media (max-width: 520px) {
      body {
        font-size: 15px;
      }

      .container {
        width: calc(100% - 30px);
      }

      .brand {
        gap: 8px;
      }

      .brand-mark {
        width: 36px;
        height: 36px;
        flex-basis: 36px;
        font-size: 12px;
      }

      .brand-name {
        max-width: 235px;
        font-size: 13px;
      }

      .hero {
        min-height: 660px;
        align-items: flex-end;
      }

      .hero-media img {
        object-position: 58% center;
      }

      .hero-shade {
        background: rgba(10, 29, 44, 0.64);
      }

      .hero-content {
        width: calc(100% - 30px);
        padding: 55px 0 48px;
      }

      .profile-line {
        margin-bottom: 20px;
      }

      .profile-mark {
        width: 47px;
        height: 47px;
        flex-basis: 47px;
      }

      .hero-label {
        margin-bottom: 12px;
        font-size: 11px;
      }

      .hero h1 {
        font-size: 31px;
        line-height: 1.34;
      }

      .hero-copy {
        margin-top: 14px;
        font-size: 14px;
        line-height: 1.8;
      }

      .hero-badges {
        gap: 7px;
        margin-top: 17px;
      }

      .hero-badge {
        min-height: 29px;
        padding-inline: 8px;
        font-size: 11px;
      }

      .hero-actions {
        gap: 9px;
        margin-top: 22px;
      }

      .button {
        min-height: 44px;
        padding-inline: 13px;
        font-size: 13px;
      }

      .section {
        padding: 54px 0;
      }

      .section-title {
        font-size: 24px;
      }

      .section-intro {
        font-size: 14px;
      }

      .category-grid {
        gap: 10px;
      }

      .category-item {
        min-height: 190px;
        padding: 17px 14px;
      }

      .category-item h3 {
        font-size: 14px;
      }

      .category-item p {
        font-size: 12px;
      }

      .category-foot {
        align-items: flex-start;
        flex-direction: column;
      }

      .search-form {
        width: 100%;
      }

      .content-grid {
        grid-template-columns: 1fr;
        gap: 13px;
      }

      .content-card {
        display: grid;
        grid-template-columns: 128px 1fr;
        min-height: 132px;
      }

      .card-image {
        height: 100%;
        min-height: 132px;
        aspect-ratio: auto;
      }

      .card-tag {
        top: 8px;
        left: 8px;
        min-height: 23px;
        padding-inline: 6px;
        font-size: 10px;
      }

      .card-body {
        display: flex;
        flex-direction: column;
        justify-content: center;
        padding: 13px;
      }

      .card-body h3 {
        font-size: 14px;
      }

      .card-body p {
        margin-top: 6px;
        font-size: 12px;
        line-height: 1.6;
      }

      .card-meta {
        margin-top: 9px;
        padding-top: 8px;
        font-size: 10px;
      }

      .featured-card {
        grid-template-columns: 104px 1fr;
        min-height: 136px;
      }

      .featured-card img {
        width: 104px;
        min-height: 136px;
      }

      .featured-copy {
        padding: 13px;
      }

      .featured-copy h3 {
        font-size: 14px;
      }

      .featured-copy p {
        font-size: 11px;
      }

      .spec-aside {
        padding: 21px;
      }

      .spec-aside h3 {
        font-size: 21px;
      }

      .spec-row {
        grid-template-columns: 105px 1fr;
        gap: 12px;
        padding: 14px 0;
      }

      .spec-row dt,
      .spec-row dd {
        font-size: 13px;
      }

      .principle-grid {
        grid-template-columns: 1fr;
        gap: 10px;
      }

      .principle {
        min-height: auto;
        padding: 19px;
      }

      .principle-number {
        margin-bottom: 11px;
      }

      .flow-list {
        grid-template-columns: 1fr;
      }

      .flow-step {
        min-height: auto;
        padding: 21px;
      }

      .flow-step + .flow-step,
      .flow-step:nth-child(3),
      .flow-step:nth-child(4) {
        border-top: 1px solid var(--line);
        border-left: 0;
      }

      .flow-step:not(:last-child)::after {
        display: none;
      }

      .flow-count {
        margin-bottom: 13px;
      }

      .index-list {
        grid-template-columns: 1fr;
      }

      .news-item {
        grid-template-columns: 94px 1fr;
        min-height: 110px;
      }

      .news-item img {
        width: 94px;
        min-height: 110px;
      }

      .news-copy {
        padding: 12px;
      }

      .news-copy h3 {
        font-size: 13px;
      }

      .news-copy p {
        font-size: 11px;
      }

      .faq-item summary {
        min-height: 58px;
        padding: 14px;
        font-size: 14px;
      }

      .faq-answer {
        padding: 0 14px 16px;
        font-size: 13px;
      }

      .contact-band {
        padding: 22px 18px;
      }

      .contact-band h2 {
        font-size: 20px;
      }

      .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 27px 17px;
      }

      .footer-grid > section:first-child {
        grid-column: 1 / -1;
      }

      .footer-bottom {
        align-items: flex-start;
        flex-direction: column;
        gap: 8px;
      }

      .age-panel {
        padding: 28px 22px;
      }

      .age-panel h2 {
        font-size: 21px;
      }
    }

    @media (prefers-reduced-motion: reduce) {
      *,
      *::before,
      *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
      }
    }

/* roulang page: category1 */
:root {
      --ink: #182b3a;
      --ink-soft: #314a5d;
      --muted: #63798a;
      --blue: #1769a6;
      --blue-deep: #124c76;
      --blue-pale: #eaf3f9;
      --teal: #278376;
      --teal-pale: #e9f5f2;
      --coral: #bd6255;
      --coral-pale: #fbefec;
      --green: #28755e;
      --surface: #ffffff;
      --page: #f5f9fc;
      --line: #dce6ed;
      --line-strong: #cad8e2;
      --shadow: 0 12px 34px rgba(26, 57, 79, 0.08);
      --shadow-hover: 0 18px 42px rgba(26, 57, 79, 0.14);
      --radius: 8px;
      --radius-sm: 5px;
      --container: 1200px;
      --transition: 180ms ease;
    }

    *,
    *::before,
    *::after {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
      scroll-padding-top: 88px;
    }

    body {
      margin: 0;
      color: var(--ink);
      background: var(--page);
      font-family: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
      font-size: 16px;
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeLegibility;
    }

    img {
      display: block;
      max-width: 100%;
    }

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

    button,
    input {
      color: inherit;
      font: inherit;
    }

    button {
      cursor: pointer;
    }

    a:focus-visible,
    button:focus-visible,
    input:focus-visible,
    summary:focus-visible {
      outline: 3px solid rgba(23, 105, 166, 0.36);
      outline-offset: 3px;
    }

    .container {
      width: min(var(--container), calc(100% - 48px));
      margin-inline: auto;
    }

    .site-header {
      position: sticky;
      z-index: 50;
      top: 0;
      border-bottom: 1px solid rgba(204, 220, 231, 0.86);
      background: rgba(255, 255, 255, 0.96);
      box-shadow: 0 3px 18px rgba(28, 56, 75, 0.035);
      backdrop-filter: blur(12px);
    }

    .header-inner {
      position: relative;
      display: flex;
      min-height: 76px;
      align-items: center;
      justify-content: space-between;
      gap: 28px;
    }

    .brand {
      display: inline-flex;
      min-width: 0;
      align-items: center;
      gap: 11px;
      color: var(--ink);
      font-weight: 800;
    }

    .brand-mark {
      display: grid;
      width: 42px;
      height: 42px;
      flex: 0 0 42px;
      place-items: center;
      border-radius: 7px;
      color: #fff;
      background: var(--blue-deep);
      font-size: 14px;
      line-height: 1;
    }

    .brand-name {
      max-width: 260px;
      font-size: 16px;
      line-height: 1.35;
    }

    .main-nav {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 4px;
    }

    .main-nav a {
      position: relative;
      display: inline-flex;
      min-height: 42px;
      align-items: center;
      padding: 0 12px;
      border-radius: 5px;
      color: var(--ink-soft);
      font-size: 14px;
      font-weight: 650;
      white-space: nowrap;
      transition: color var(--transition), background var(--transition);
    }

    .main-nav a:hover,
    .main-nav a:focus-visible {
      color: var(--blue-deep);
      background: var(--blue-pale);
    }

    .main-nav a[aria-current="page"] {
      color: var(--blue-deep);
      background: #e8f2f8;
    }

    .menu-toggle {
      display: none;
      width: 42px;
      height: 42px;
      align-items: center;
      justify-content: center;
      border: 1px solid var(--line);
      border-radius: 6px;
      background: var(--surface);
    }

    .menu-toggle span,
    .menu-toggle::before,
    .menu-toggle::after {
      position: absolute;
      width: 18px;
      height: 2px;
      border-radius: 2px;
      background: var(--ink-soft);
      content: "";
      transition: transform var(--transition), opacity var(--transition);
    }

    .menu-toggle::before {
      transform: translateY(-6px);
    }

    .menu-toggle::after {
      transform: translateY(6px);
    }

    .menu-toggle[aria-expanded="true"] span {
      opacity: 0;
    }

    .menu-toggle[aria-expanded="true"]::before {
      transform: rotate(45deg);
    }

    .menu-toggle[aria-expanded="true"]::after {
      transform: rotate(-45deg);
    }

    .category-hero {
      position: relative;
      display: flex;
      min-height: 515px;
      align-items: center;
      overflow: hidden;
      isolation: isolate;
      color: #fff;
      background: #17374e;
    }

    .category-hero::before,
    .category-hero::after {
      position: absolute;
      z-index: -1;
      inset: 0;
      content: "";
    }

    .category-hero::before {
      background-image: url("https://images.unsplash.com/photo-1524504388940-b1c1722653e1?auto=format&fit=crop&w=2000&q=88");
      background-position: center 38%;
      background-size: cover;
    }

    .category-hero::after {
      background: rgba(10, 29, 44, 0.61);
    }

    .hero-layout {
      display: grid;
      width: min(var(--container), calc(100% - 48px));
      grid-template-columns: minmax(0, 1fr) 245px;
      align-items: center;
      gap: 52px;
      margin-inline: auto;
      padding-block: 72px 78px;
    }

    .hero-copy {
      max-width: 760px;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 9px;
      color: #d8ecf7;
      font-size: 13px;
      font-weight: 750;
    }

    .eyebrow::before {
      width: 25px;
      height: 2px;
      background: #78c4b7;
      content: "";
    }

    .category-hero h1 {
      max-width: 800px;
      margin: 17px 0 0;
      color: #fff;
      font-size: 48px;
      font-weight: 820;
      line-height: 1.25;
      overflow-wrap: anywhere;
      text-shadow: 0 2px 12px rgba(0, 0, 0, 0.28);
    }

    .hero-lead {
      max-width: 710px;
      margin: 18px 0 0;
      color: rgba(255, 255, 255, 0.91);
      font-size: 17px;
      line-height: 1.9;
    }

    .hero-points {
      display: flex;
      flex-wrap: wrap;
      gap: 9px;
      margin: 22px 0 0;
      padding: 0;
      list-style: none;
    }

    .hero-points li {
      display: inline-flex;
      min-height: 32px;
      align-items: center;
      padding: 4px 11px;
      border: 1px solid rgba(255, 255, 255, 0.36);
      border-radius: 4px;
      color: #f5fbff;
      background: rgba(12, 33, 49, 0.36);
      font-size: 12px;
      font-weight: 650;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 27px;
    }

    .button {
      display: inline-flex;
      min-height: 48px;
      align-items: center;
      justify-content: center;
      gap: 9px;
      padding: 0 19px;
      border: 1px solid transparent;
      border-radius: 5px;
      font-size: 14px;
      font-weight: 750;
      transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition);
    }

    .button:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(8, 30, 45, 0.18);
    }

    .button:active {
      transform: translateY(0);
    }

    .button-primary {
      color: #fff;
      background: var(--blue);
    }

    .button-primary:hover {
      background: #0f5a92;
    }

    .button-light {
      border-color: rgba(255, 255, 255, 0.58);
      color: #fff;
      background: rgba(255, 255, 255, 0.08);
    }

    .button-light:hover {
      border-color: #fff;
      background: rgba(255, 255, 255, 0.16);
    }

    .hero-aside {
      display: flex;
      min-height: 280px;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 24px;
      border: 1px solid rgba(255, 255, 255, 0.36);
      border-radius: var(--radius);
      background: rgba(10, 33, 49, 0.38);
      text-align: center;
      backdrop-filter: blur(7px);
    }

    .age-seal {
      display: grid;
      width: 118px;
      aspect-ratio: 1;
      place-items: center;
      border: 1px solid rgba(197, 232, 244, 0.8);
      border-radius: 50%;
      color: #fff;
      box-shadow: inset 0 0 0 8px rgba(255, 255, 255, 0.06), 0 0 0 7px rgba(255, 255, 255, 0.07);
    }

    .age-seal strong {
      display: block;
      font-size: 38px;
      line-height: 1;
    }

    .age-seal span {
      display: block;
      margin-top: 7px;
      color: #d8ecf7;
      font-size: 12px;
      font-weight: 700;
    }

    .hero-aside p {
      margin: 22px 0 0;
      color: rgba(255, 255, 255, 0.88);
      font-size: 13px;
      line-height: 1.7;
    }

    main {
      overflow: clip;
    }

    .section {
      padding: 76px 0;
      border-bottom: 1px solid var(--line);
      background: var(--page);
    }

    .section-white {
      background: var(--surface);
    }

    .section-tint {
      background: #eef5f9;
    }

    .section-heading {
      display: flex;
      align-items: end;
      justify-content: space-between;
      gap: 28px;
      margin-bottom: 30px;
    }

    .section-heading-main {
      max-width: 700px;
    }

    .section-kicker {
      display: block;
      margin-bottom: 8px;
      color: var(--teal);
      font-size: 12px;
      font-weight: 800;
    }

    .section-heading h2 {
      margin: 0;
      color: var(--ink);
      font-size: 30px;
      font-weight: 800;
      line-height: 1.35;
    }

    .section-heading p {
      max-width: 620px;
      margin: 9px 0 0;
      color: var(--muted);
      font-size: 14px;
    }

    .text-link {
      display: inline-flex;
      min-height: 40px;
      align-items: center;
      gap: 7px;
      color: var(--blue-deep);
      font-size: 14px;
      font-weight: 750;
      white-space: nowrap;
      transition: color var(--transition), gap var(--transition);
    }

    .text-link::after {
      content: "→";
    }

    .text-link:hover {
      gap: 11px;
      color: var(--teal);
    }

    .topic-grid {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 20px;
    }

    .topic-card {
      min-width: 0;
      overflow: hidden;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: var(--surface);
      box-shadow: 0 5px 18px rgba(26, 57, 79, 0.045);
      transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    }

    .topic-card:hover {
      transform: translateY(-4px);
      border-color: var(--line-strong);
      box-shadow: var(--shadow-hover);
    }

    .topic-image {
      position: relative;
      overflow: hidden;
      aspect-ratio: 16 / 10;
      background: #d9e5ec;
    }

    .topic-image img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 400ms ease;
    }

    .topic-card:hover .topic-image img {
      transform: scale(1.045);
    }

    .topic-tag {
      position: absolute;
      bottom: 12px;
      left: 12px;
      display: inline-flex;
      min-height: 27px;
      align-items: center;
      padding: 3px 9px;
      border: 1px solid rgba(255, 255, 255, 0.64);
      border-radius: 4px;
      color: #fff;
      background: rgba(16, 42, 59, 0.7);
      font-size: 11px;
      font-weight: 700;
      backdrop-filter: blur(6px);
    }

    .topic-body {
      padding: 17px 17px 16px;
    }

    .topic-body h3 {
      margin: 0;
      color: var(--ink);
      font-size: 16px;
      font-weight: 780;
      line-height: 1.55;
    }

    .topic-body p {
      min-height: 48px;
      margin: 9px 0 14px;
      color: var(--muted);
      font-size: 13px;
      line-height: 1.75;
    }

    .topic-meta {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 10px;
      padding-top: 11px;
      border-top: 1px solid var(--line);
      color: var(--muted);
      font-size: 11px;
    }

    .status-badge {
      display: inline-flex;
      min-height: 23px;
      align-items: center;
      padding: 2px 7px;
      border-radius: 4px;
      color: var(--green);
      background: var(--teal-pale);
      font-size: 11px;
      font-weight: 750;
      white-space: nowrap;
    }

    .feature-layout {
      display: grid;
      grid-template-columns: minmax(0, 1.12fr) minmax(300px, 0.88fr);
      gap: 24px;
    }

    .feature-lead {
      position: relative;
      display: flex;
      min-height: 360px;
      align-items: end;
      overflow: hidden;
      border-radius: var(--radius);
      color: #fff;
      background: #17374e;
      isolation: isolate;
    }

    .feature-lead::before,
    .feature-lead::after {
      position: absolute;
      z-index: -1;
      inset: 0;
      content: "";
    }

    .feature-lead::before {
      background: url("https://images.unsplash.com/photo-1534528741775-53994a69daeb?auto=format&fit=crop&w=1200&q=85") center 36% / cover;
      transition: transform 500ms ease;
    }

    .feature-lead:hover::before {
      transform: scale(1.035);
    }

    .feature-lead::after {
      background: linear-gradient(0deg, rgba(10, 29, 44, 0.88), rgba(10, 29, 44, 0.02) 78%);
    }

    .feature-lead-content {
      padding: 30px;
    }

    .feature-lead-content .section-kicker {
      color: #a9dfd3;
    }

    .feature-lead h3 {
      max-width: 540px;
      margin: 0;
      color: #fff;
      font-size: 27px;
      line-height: 1.4;
    }

    .feature-lead p {
      max-width: 530px;
      margin: 10px 0 0;
      color: rgba(255, 255, 255, 0.86);
      font-size: 14px;
    }

    .feature-list {
      display: grid;
      gap: 12px;
    }

    .feature-item {
      display: grid;
      grid-template-columns: 62px minmax(0, 1fr);
      align-items: center;
      gap: 15px;
      padding: 15px;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: var(--surface);
      transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
    }

    .feature-item:hover {
      transform: translateX(3px);
      border-color: var(--line-strong);
      box-shadow: var(--shadow);
    }

    .feature-number {
      display: grid;
      width: 62px;
      aspect-ratio: 1;
      place-items: center;
      border-radius: 6px;
      color: var(--blue-deep);
      background: var(--blue-pale);
      font-size: 13px;
      font-weight: 800;
    }

    .feature-item h3 {
      margin: 0;
      font-size: 15px;
      line-height: 1.45;
    }

    .feature-item p {
      margin: 5px 0 0;
      color: var(--muted);
      font-size: 12px;
      line-height: 1.65;
    }

    .channel-grid {
      display: grid;
      grid-template-columns: repeat(5, minmax(0, 1fr));
      gap: 14px;
    }

    .channel-item {
      position: relative;
      display: flex;
      min-height: 205px;
      flex-direction: column;
      justify-content: space-between;
      padding: 20px;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: var(--surface);
      transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
    }

    .channel-item:hover {
      transform: translateY(-3px);
      border-color: #b8d0df;
      box-shadow: var(--shadow);
    }

    .channel-index {
      color: var(--teal);
      font-size: 12px;
      font-weight: 800;
    }

    .channel-item h3 {
      margin: 14px 0 7px;
      font-size: 16px;
      line-height: 1.45;
    }

    .channel-item p {
      margin: 0;
      color: var(--muted);
      font-size: 12px;
      line-height: 1.75;
    }

    .channel-arrow {
      align-self: end;
      margin-top: 14px;
      color: var(--blue);
      font-size: 18px;
      line-height: 1;
      transition: transform var(--transition);
    }

    .channel-item:hover .channel-arrow {
      transform: translateX(4px);
    }

    .ranking-layout {
      display: grid;
      grid-template-columns: minmax(0, 1fr) 300px;
      gap: 40px;
      align-items: start;
    }

    .ranking-list {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 0 25px;
      margin: 0;
      padding: 0;
      list-style: none;
    }

    .ranking-list li {
      display: grid;
      min-height: 72px;
      grid-template-columns: 34px minmax(0, 1fr) auto;
      align-items: center;
      gap: 12px;
      border-bottom: 1px solid var(--line);
    }

    .rank-number {
      color: #8da0ae;
      font-size: 17px;
      font-weight: 800;
      text-align: center;
    }

    .ranking-list li:nth-child(-n+3) .rank-number {
      color: var(--coral);
    }

    .rank-title {
      overflow: hidden;
      color: var(--ink);
      font-size: 13px;
      font-weight: 720;
      text-overflow: ellipsis;
      white-space: nowrap;
    }

    .rank-category {
      padding: 3px 7px;
      border-radius: 4px;
      color: var(--blue-deep);
      background: var(--blue-pale);
      font-size: 10px;
      white-space: nowrap;
    }

    .ranking-note {
      padding: 23px;
      border-left: 3px solid var(--teal);
      background: #eaf3f5;
    }

    .ranking-note h3 {
      margin: 0;
      font-size: 17px;
      line-height: 1.5;
    }

    .ranking-note p {
      margin: 10px 0 0;
      color: var(--muted);
      font-size: 13px;
      line-height: 1.8;
    }

    .standards-layout {
      display: grid;
      grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
      gap: 65px;
      align-items: center;
    }

    .standards-intro h2 {
      margin: 0;
      font-size: 30px;
      line-height: 1.4;
    }

    .standards-intro > p {
      margin: 14px 0 0;
      color: var(--muted);
      font-size: 15px;
    }

    .standards-mark {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin-top: 22px;
      padding: 7px 11px;
      border: 1px solid #c7dfd7;
      border-radius: 4px;
      color: #206854;
      background: #f0f8f5;
      font-size: 12px;
      font-weight: 750;
    }

    .standards-list {
      display: grid;
      gap: 0;
      margin: 0;
      padding: 0;
      list-style: none;
    }

    .standards-list li {
      display: grid;
      grid-template-columns: 42px minmax(0, 1fr);
      gap: 16px;
      padding: 18px 0;
      border-bottom: 1px solid var(--line);
    }

    .standards-list li:first-child {
      border-top: 1px solid var(--line);
    }

    .standard-icon {
      display: grid;
      width: 42px;
      height: 42px;
      place-items: center;
      border-radius: 6px;
      color: var(--blue-deep);
      background: var(--blue-pale);
      font-size: 15px;
      font-weight: 800;
    }

    .standards-list h3 {
      margin: 0;
      font-size: 15px;
    }

    .standards-list p {
      margin: 5px 0 0;
      color: var(--muted);
      font-size: 13px;
      line-height: 1.75;
    }

    .updates-list {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 15px;
    }

    .update-item {
      display: grid;
      grid-template-columns: 72px minmax(0, 1fr);
      gap: 14px;
      min-height: 104px;
      padding: 15px;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: var(--surface);
      transition: border-color var(--transition), box-shadow var(--transition);
    }

    .update-item:hover {
      border-color: var(--line-strong);
      box-shadow: var(--shadow);
    }

    .update-thumb {
      display: grid;
      min-height: 72px;
      place-items: center;
      overflow: hidden;
      border-radius: 5px;
      color: var(--blue-deep);
      background: #e7f0f5;
      font-size: 12px;
      font-weight: 800;
    }

    .update-thumb.teal {
      color: #216d63;
      background: #e4f2ee;
    }

    .update-thumb.coral {
      color: #9c5149;
      background: #f8eae7;
    }

    .update-item h3 {
      margin: 1px 0 6px;
      font-size: 13px;
      line-height: 1.55;
    }

    .update-item p {
      margin: 0;
      color: var(--muted);
      font-size: 11px;
      line-height: 1.6;
    }

    .faq-layout {
      display: grid;
      grid-template-columns: 0.72fr 1.28fr;
      gap: 60px;
      align-items: start;
    }

    .faq-intro h2 {
      margin: 0;
      font-size: 30px;
      line-height: 1.4;
    }

    .faq-intro p {
      margin: 12px 0 0;
      color: var(--muted);
      font-size: 14px;
    }

    .faq-list {
      border-top: 1px solid var(--line);
    }

    .faq-list details {
      border-bottom: 1px solid var(--line);
    }

    .faq-list summary {
      position: relative;
      display: flex;
      min-height: 64px;
      align-items: center;
      padding: 14px 42px 14px 0;
      color: var(--ink);
      font-size: 15px;
      font-weight: 740;
      cursor: pointer;
      list-style: none;
    }

    .faq-list summary::-webkit-details-marker {
      display: none;
    }

    .faq-list summary::after {
      position: absolute;
      right: 7px;
      color: var(--blue);
      font-size: 22px;
      font-weight: 400;
      content: "+";
      transition: transform var(--transition);
    }

    .faq-list details[open] summary::after {
      transform: rotate(45deg);
    }

    .faq-answer {
      max-width: 760px;
      padding: 0 35px 18px 0;
      color: var(--muted);
      font-size: 14px;
      line-height: 1.85;
    }

    .rights-band {
      padding: 38px 0;
      color: #fff;
      background: var(--blue-deep);
    }

    .rights-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 30px;
    }

    .rights-copy {
      max-width: 760px;
    }

    .rights-copy h2 {
      margin: 0;
      color: #fff;
      font-size: 22px;
      line-height: 1.45;
    }

    .rights-copy p {
      margin: 8px 0 0;
      color: rgba(255, 255, 255, 0.8);
      font-size: 13px;
    }

    .rights-inner .button {
      flex: 0 0 auto;
      border-color: rgba(255, 255, 255, 0.55);
      color: #fff;
      background: transparent;
    }

    .rights-inner .button:hover {
      color: var(--blue-deep);
      background: #fff;
    }

    .site-footer {
      padding: 55px 0 0;
      color: #dce8ef;
      background: #142c3d;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.45fr repeat(3, minmax(0, 1fr));
      gap: 38px;
      padding-bottom: 38px;
    }

    .footer-brand {
      display: inline-flex;
      align-items: center;
      gap: 11px;
      color: #fff;
      font-size: 15px;
      font-weight: 800;
    }

    .footer-brand .brand-mark {
      color: var(--blue-deep);
      background: #d9edf6;
    }

    .footer-intro {
      max-width: 370px;
      margin: 15px 0 0;
      color: #b8cbd7;
      font-size: 12px;
      line-height: 1.85;
    }

    .footer-column h2 {
      margin: 4px 0 13px;
      color: #fff;
      font-size: 13px;
      font-weight: 750;
    }

    .footer-links {
      display: grid;
      gap: 8px;
      margin: 0;
      padding: 0;
      list-style: none;
    }

    .footer-links a {
      color: #b8cbd7;
      font-size: 12px;
      transition: color var(--transition);
    }

    .footer-links a:hover {
      color: #fff;
    }

    .footer-bottom {
      display: flex;
      min-height: 58px;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      border-top: 1px solid rgba(220, 232, 239, 0.15);
      color: #a8bdca;
      font-size: 11px;
    }

    @media (max-width: 1080px) {
      .header-inner {
        gap: 16px;
      }

      .menu-toggle {
        position: relative;
        display: inline-flex;
        flex: 0 0 42px;
      }

      .main-nav {
        position: absolute;
        top: calc(100% + 1px);
        right: 0;
        left: 0;
        display: none;
        align-items: stretch;
        flex-direction: column;
        gap: 4px;
        padding: 12px;
        border: 1px solid var(--line);
        border-top: 0;
        border-radius: 0 0 7px 7px;
        background: #fff;
        box-shadow: var(--shadow);
      }

      .main-nav.is-open {
        display: flex;
      }

      .main-nav a {
        min-height: 44px;
        padding-inline: 12px;
      }

      .topic-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
      }

      .channel-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
      }
    }

    @media (max-width: 768px) {
      .container {
        width: min(var(--container), calc(100% - 36px));
      }

      .category-hero {
        min-height: 0;
      }

      .hero-layout {
        width: calc(100% - 36px);
        grid-template-columns: minmax(0, 1fr);
        gap: 28px;
        padding-block: 64px;
      }

      .category-hero h1 {
        font-size: 39px;
      }

      .hero-aside {
        min-height: 0;
        flex-direction: row;
        justify-content: flex-start;
        gap: 20px;
        padding: 18px;
        text-align: left;
      }

      .age-seal {
        width: 82px;
        flex: 0 0 82px;
      }

      .age-seal strong {
        font-size: 30px;
      }

      .age-seal span {
        margin-top: 4px;
        font-size: 10px;
      }

      .hero-aside p {
        margin: 0;
      }

      .section {
        padding: 60px 0;
      }

      .section-heading {
        align-items: flex-start;
        flex-direction: column;
        gap: 13px;
      }

      .section-heading h2,
      .standards-intro h2,
      .faq-intro h2 {
        font-size: 27px;
      }

      .topic-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 14px;
      }

      .feature-layout,
      .ranking-layout,
      .standards-layout,
      .faq-layout {
        grid-template-columns: minmax(0, 1fr);
        gap: 28px;
      }

      .feature-lead {
        min-height: 310px;
      }

      .channel-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .ranking-note {
        border-left-width: 3px;
      }

      .updates-list {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .footer-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 30px;
      }

      .footer-grid > section:first-child {
        grid-column: 1 / -1;
      }
    }

    @media (max-width: 520px) {
      .container {
        width: calc(100% - 32px);
      }

      .header-inner {
        min-height: 68px;
      }

      .brand {
        gap: 9px;
      }

      .brand-mark {
        width: 38px;
        height: 38px;
        flex-basis: 38px;
        font-size: 13px;
      }

      .brand-name {
        max-width: 220px;
        font-size: 14px;
      }

      .hero-layout {
        width: calc(100% - 32px);
        padding-block: 51px;
      }

      .category-hero h1 {
        font-size: 32px;
      }

      .hero-lead {
        font-size: 15px;
      }

      .hero-actions {
        align-items: stretch;
      }

      .hero-actions .button {
        flex: 1 1 145px;
        padding-inline: 12px;
      }

      .hero-aside {
        gap: 14px;
        padding: 14px;
      }

      .section {
        padding: 48px 0;
      }

      .section-heading h2,
      .standards-intro h2,
      .faq-intro h2 {
        font-size: 24px;
      }

      .topic-grid {
        grid-template-columns: minmax(0, 1fr);
      }

      .topic-card {
        display: grid;
        grid-template-columns: 116px minmax(0, 1fr);
      }

      .topic-image {
        min-height: 100%;
        aspect-ratio: auto;
      }

      .topic-tag {
        right: 6px;
        bottom: 7px;
        left: 6px;
        justify-content: center;
        padding-inline: 4px;
        font-size: 9px;
      }

      .topic-body {
        padding: 13px;
      }

      .topic-body h3 {
        font-size: 14px;
      }

      .topic-body p {
        min-height: 0;
        margin-block: 6px 9px;
        font-size: 12px;
      }

      .topic-meta {
        align-items: flex-start;
        flex-direction: column;
        gap: 5px;
      }

      .feature-lead {
        min-height: 275px;
      }

      .feature-lead-content {
        padding: 21px;
      }

      .feature-lead h3 {
        font-size: 22px;
      }

      .channel-grid {
        grid-template-columns: minmax(0, 1fr);
      }

      .channel-item {
        min-height: 0;
        padding: 17px;
      }

      .channel-item h3 {
        margin-top: 9px;
      }

      .ranking-list {
        grid-template-columns: minmax(0, 1fr);
      }

      .ranking-list li {
        min-height: 64px;
      }

      .updates-list {
        grid-template-columns: minmax(0, 1fr);
      }

      .rights-inner {
        align-items: flex-start;
        flex-direction: column;
        gap: 18px;
      }

      .footer-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 26px 18px;
      }

      .footer-grid > section:first-child {
        grid-column: 1 / -1;
      }

      .footer-bottom {
        align-items: flex-start;
        flex-direction: column;
        justify-content: center;
        gap: 3px;
        padding-block: 13px;
      }
    }

    @media (prefers-reduced-motion: reduce) {
      *,
      *::before,
      *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
      }
    }