/* roulang page: index */
:root {
      --color-primary: #2168d5;
      --color-primary-dark: #1553ad;
      --color-primary-soft: #eaf2ff;
      --color-accent: #18a7b8;
      --color-accent-soft: #e8fbfd;
      --color-violet-soft: #f1f0ff;
      --color-bg: #f6f9fd;
      --color-surface: #ffffff;
      --color-surface-2: #fbfdff;
      --color-text: #172033;
      --color-muted: #64748b;
      --color-light: #8a97aa;
      --color-border: #dce6f2;
      --color-border-soft: #edf2f8;
      --color-danger: #d94343;
      --shadow-sm: 0 8px 20px rgba(33, 104, 213, .07);
      --shadow-md: 0 14px 34px rgba(21, 83, 173, .10);
      --shadow-lg: 0 24px 56px rgba(21, 83, 173, .14);
      --radius-xs: 6px;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --container: 1180px;
      --header-height: 72px;
      --transition: 180ms ease;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      min-height: 100vh;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
      color: var(--color-text);
      background: linear-gradient(180deg, #f7fbff 0%, var(--color-bg) 44%, #ffffff 100%);
      line-height: 1.65;
      letter-spacing: 0;
      text-rendering: optimizeLegibility;
      padding-bottom: 0;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color var(--transition), background var(--transition), border-color var(--transition), transform var(--transition);
    }

    a:hover {
      color: var(--color-primary);
    }

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

    button,
    input,
    select,
    textarea {
      font: inherit;
    }

    button {
      border: 0;
      cursor: pointer;
      background: none;
    }

    button:disabled,
    .btn.is-disabled {
      opacity: .52;
      cursor: not-allowed;
      transform: none;
      box-shadow: none;
    }

    input,
    select,
    textarea {
      width: 100%;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      background: #fff;
      color: var(--color-text);
      outline: none;
      transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
    }

    input:focus,
    select:focus,
    textarea:focus,
    button:focus-visible,
    a:focus-visible {
      outline: 3px solid rgba(33, 104, 213, .18);
      outline-offset: 3px;
    }

    input.error {
      border-color: var(--color-danger);
      background: #fff7f7;
    }

    .container {
      width: min(100% - 40px, var(--container));
      margin: 0 auto;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      height: var(--header-height);
      background: rgba(255, 255, 255, .88);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--color-border-soft);
      box-shadow: 0 4px 18px rgba(30, 64, 120, .04);
    }

    .nav-wrap {
      height: var(--header-height);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      min-width: 0;
      font-weight: 800;
      color: var(--color-text);
      white-space: nowrap;
    }

    .brand-mark {
      width: 34px;
      height: 34px;
      border-radius: 9px;
      display: grid;
      place-items: center;
      color: #fff;
      font-size: 16px;
      background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
      box-shadow: 0 8px 18px rgba(33, 104, 213, .22);
    }

    .brand-text {
      font-size: 17px;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .desktop-nav {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      padding: 5px;
      border: 1px solid var(--color-border-soft);
      border-radius: 999px;
      background: #f9fbff;
    }

    .desktop-nav a {
      display: inline-flex;
      align-items: center;
      gap: 7px;
      min-height: 36px;
      padding: 7px 15px;
      border-radius: 999px;
      color: var(--color-muted);
      font-size: 14px;
      font-weight: 650;
    }

    .desktop-nav a:hover,
    .desktop-nav a.active {
      color: var(--color-primary);
      background: var(--color-primary-soft);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .mini-search {
      width: 220px;
      height: 40px;
      display: flex;
      align-items: center;
      gap: 8px;
      padding: 0 12px;
      border: 1px solid var(--color-border);
      border-radius: 999px;
      background: #fff;
      color: var(--color-light);
      box-shadow: var(--shadow-sm);
    }

    .mini-search input {
      border: 0;
      padding: 0;
      background: transparent;
      font-size: 14px;
      box-shadow: none;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      min-height: 42px;
      padding: 10px 18px;
      border-radius: var(--radius-sm);
      border: 1px solid transparent;
      font-weight: 700;
      font-size: 14px;
      line-height: 1.2;
      transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition), color var(--transition);
      white-space: nowrap;
    }

    .btn:hover {
      transform: translateY(-1px);
    }

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

    .btn-primary {
      color: #fff;
      background: var(--color-primary);
      box-shadow: 0 10px 22px rgba(33, 104, 213, .22);
    }

    .btn-primary:hover {
      color: #fff;
      background: var(--color-primary-dark);
      box-shadow: var(--shadow-md);
    }

    .btn-secondary {
      color: var(--color-primary);
      background: #fff;
      border-color: var(--color-border);
      box-shadow: var(--shadow-sm);
    }

    .btn-secondary:hover {
      background: var(--color-primary-soft);
      border-color: #c9dbf4;
    }

    .btn-ghost {
      color: var(--color-muted);
      background: transparent;
      border-color: var(--color-border);
    }

    .btn-ghost:hover {
      color: var(--color-primary);
      background: #fff;
    }

    main {
      overflow: hidden;
    }

    section {
      padding: 74px 0;
    }

    .section-head {
      display: flex;
      align-items: end;
      justify-content: space-between;
      gap: 24px;
      margin-bottom: 30px;
    }

    .section-kicker {
      display: inline-flex;
      align-items: center;
      gap: 7px;
      color: var(--color-primary);
      font-size: 13px;
      font-weight: 800;
      margin-bottom: 8px;
    }

    .section-title {
      font-size: clamp(26px, 3vw, 38px);
      line-height: 1.24;
      font-weight: 850;
      color: var(--color-text);
    }

    .section-desc {
      max-width: 650px;
      color: var(--color-muted);
      font-size: 15px;
      margin-top: 10px;
    }

    .hero {
      padding: 62px 0 52px;
      min-height: calc(100vh - var(--header-height) - 28px);
      display: flex;
      align-items: center;
      position: relative;
    }

    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background:
        linear-gradient(90deg, rgba(33, 104, 213, .05) 1px, transparent 1px),
        linear-gradient(180deg, rgba(33, 104, 213, .05) 1px, transparent 1px);
      background-size: 42px 42px;
      mask-image: linear-gradient(180deg, #000 0%, transparent 82%);
      pointer-events: none;
    }

    .hero-panel {
      position: relative;
      width: 100%;
      padding: 46px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      background:
        linear-gradient(180deg, rgba(255,255,255,.94), rgba(255,255,255,.78)),
        radial-gradient(circle at 16% 20%, rgba(24,167,184,.11), transparent 34%),
        radial-gradient(circle at 80% 12%, rgba(33,104,213,.12), transparent 30%);
      box-shadow: var(--shadow-lg);
    }

    .hero-main {
      max-width: 870px;
      margin: 0 auto;
      text-align: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 12px;
      margin-bottom: 18px;
      border: 1px solid #cde1fb;
      border-radius: 999px;
      color: var(--color-primary);
      background: rgba(234, 242, 255, .86);
      font-size: 13px;
      font-weight: 800;
    }

    .hero h1 {
      font-size: clamp(34px, 5vw, 58px);
      line-height: 1.12;
      font-weight: 900;
      color: var(--color-text);
      letter-spacing: 0;
      margin-bottom: 18px;
    }

    .hero-subtitle {
      width: min(100%, 760px);
      margin: 0 auto 28px;
      color: var(--color-muted);
      font-size: 17px;
      line-height: 1.8;
    }

    .hero-search {
      width: min(100%, 760px);
      margin: 0 auto;
      padding: 8px;
      border: 1px solid var(--color-border);
      border-radius: 14px;
      background: #fff;
      box-shadow: var(--shadow-md);
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 8px;
    }

    .hero-search .search-field {
      display: flex;
      align-items: center;
      gap: 10px;
      padding: 0 14px;
      color: var(--color-light);
      min-width: 0;
    }

    .hero-search input {
      height: 46px;
      border: 0;
      box-shadow: none;
      background: transparent;
      font-size: 15px;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 12px;
      flex-wrap: wrap;
      margin-top: 18px;
    }

    .quick-tags {
      display: flex;
      justify-content: center;
      align-items: center;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 22px;
    }

    .tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 7px 11px;
      border: 1px solid var(--color-border);
      border-radius: 999px;
      color: var(--color-muted);
      background: rgba(255, 255, 255, .78);
      font-size: 13px;
      font-weight: 700;
      transition: color var(--transition), background var(--transition), border-color var(--transition), transform var(--transition);
    }

    .tag:hover,
    .tag.active {
      color: var(--color-primary);
      border-color: #c9dbf4;
      background: var(--color-primary-soft);
      transform: translateY(-1px);
    }

    .hero-stats {
      margin-top: 32px;
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
    }

    .stat-tile {
      padding: 18px;
      border: 1px solid var(--color-border-soft);
      border-radius: var(--radius-md);
      background: rgba(255,255,255,.72);
      text-align: left;
    }

    .stat-num {
      font-size: 26px;
      font-weight: 900;
      color: var(--color-primary);
      line-height: 1;
    }

    .stat-label {
      margin-top: 8px;
      color: var(--color-muted);
      font-size: 13px;
      font-weight: 650;
    }

    .latest {
      background: #fff;
    }

    .update-layout {
      display: grid;
      grid-template-columns: 1.05fr .95fr;
      gap: 22px;
      align-items: stretch;
    }

    .update-feature {
      padding: 26px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--color-border);
      background: linear-gradient(135deg, #ffffff 0%, #f3f8ff 100%);
      box-shadow: var(--shadow-sm);
    }

    .feature-top {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      margin-bottom: 18px;
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 5px 9px;
      border-radius: 999px;
      background: var(--color-accent-soft);
      color: #0b7e8d;
      font-size: 12px;
      font-weight: 800;
    }

    .feature-title {
      font-size: 26px;
      line-height: 1.3;
      margin-bottom: 12px;
      font-weight: 850;
    }

    .feature-title a:hover {
      text-decoration: underline;
      text-underline-offset: 5px;
    }

    .feature-copy {
      color: var(--color-muted);
      font-size: 15px;
      margin-bottom: 22px;
    }

    .feature-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
    }

    .mini-card {
      padding: 15px;
      border: 1px solid var(--color-border-soft);
      border-radius: var(--radius-sm);
      background: #fff;
    }

    .mini-card strong {
      display: block;
      color: var(--color-text);
      font-size: 15px;
      margin-bottom: 5px;
    }

    .mini-card span {
      color: var(--color-muted);
      font-size: 13px;
    }

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

    .update-item {
      min-height: 94px;
      padding: 18px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      background: var(--color-surface);
      box-shadow: 0 8px 18px rgba(33, 104, 213, .04);
      display: grid;
      grid-template-columns: auto 1fr;
      gap: 14px;
      align-items: start;
      transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    }

    .update-item:hover {
      transform: translateY(-2px);
      border-color: #c9dbf4;
      box-shadow: var(--shadow-md);
    }

    .date-chip {
      min-width: 52px;
      padding: 7px 8px;
      border-radius: var(--radius-xs);
      background: var(--color-primary-soft);
      color: var(--color-primary);
      text-align: center;
      font-weight: 850;
      line-height: 1.1;
    }

    .date-chip small {
      display: block;
      margin-top: 3px;
      font-size: 11px;
      color: #5f86bd;
    }

    .update-item h3 {
      font-size: 16px;
      line-height: 1.42;
      margin-bottom: 5px;
    }

    .update-item p {
      color: var(--color-muted);
      font-size: 13px;
    }

    .answers {
      background: linear-gradient(180deg, #f6f9fd 0%, #ffffff 100%);
    }

    .answer-wrap {
      display: grid;
      grid-template-columns: .82fr 1.18fr;
      gap: 28px;
      align-items: start;
    }

    .answer-note {
      padding: 24px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      background: #fff;
      box-shadow: var(--shadow-sm);
    }

    .answer-note h2 {
      font-size: 30px;
      line-height: 1.28;
      margin-bottom: 12px;
    }

    .answer-note p {
      color: var(--color-muted);
      margin-bottom: 18px;
    }

    .answer-points {
      display: grid;
      gap: 10px;
    }

    .answer-points li {
      list-style: none;
      display: flex;
      gap: 9px;
      color: var(--color-muted);
      font-size: 14px;
    }

    .answer-points li::before {
      content: "✓";
      width: 20px;
      height: 20px;
      border-radius: 50%;
      display: inline-grid;
      place-items: center;
      flex: 0 0 auto;
      background: var(--color-accent-soft);
      color: #0b7e8d;
      font-size: 12px;
      font-weight: 900;
      margin-top: 2px;
    }

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

    .faq-item {
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      background: #fff;
      overflow: hidden;
      box-shadow: 0 8px 18px rgba(33, 104, 213, .04);
    }

    .faq-question {
      width: 100%;
      min-height: 60px;
      padding: 18px 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 14px;
      color: var(--color-text);
      text-align: left;
      font-weight: 800;
    }

    .faq-question:hover {
      color: var(--color-primary);
      background: #fbfdff;
    }

    .faq-icon {
      width: 26px;
      height: 26px;
      border-radius: 50%;
      display: inline-grid;
      place-items: center;
      flex: 0 0 auto;
      background: var(--color-primary-soft);
      color: var(--color-primary);
      transition: transform var(--transition);
    }

    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }

    .faq-answer {
      display: none;
      padding: 0 20px 20px;
      color: var(--color-muted);
      line-height: 1.82;
      font-size: 14px;
    }

    .faq-item.open .faq-answer {
      display: block;
    }

    .news {
      background: #fff;
    }

    .news-grid {
      display: grid;
      grid-template-columns: minmax(0, 1fr) 330px;
      gap: 24px;
      align-items: start;
    }

    .headline-list {
      display: grid;
      gap: 10px;
    }

    .headline-item {
      min-height: 86px;
      padding: 18px 20px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      background: #fff;
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 18px;
      align-items: center;
      transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    }

    .headline-item:hover {
      transform: translateY(-2px);
      border-color: #c9dbf4;
      box-shadow: var(--shadow-md);
    }

    .headline-item h3 {
      font-size: 17px;
      line-height: 1.4;
      margin-bottom: 5px;
    }

    .headline-item p {
      color: var(--color-muted);
      font-size: 13px;
    }

    .meta {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: var(--color-light);
      font-size: 12px;
      white-space: nowrap;
    }

    .side-panel {
      padding: 22px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      background: linear-gradient(180deg, #ffffff, #f7fbff);
      box-shadow: var(--shadow-sm);
      position: sticky;
      top: 92px;
    }

    .side-panel h3 {
      font-size: 19px;
      margin-bottom: 12px;
    }

    .rank-list {
      display: grid;
      gap: 11px;
    }

    .rank-item {
      display: grid;
      grid-template-columns: 26px 1fr;
      gap: 10px;
      align-items: start;
      padding: 11px 0;
      border-bottom: 1px solid var(--color-border-soft);
    }

    .rank-item:last-child {
      border-bottom: 0;
    }

    .rank-num {
      width: 26px;
      height: 26px;
      display: grid;
      place-items: center;
      border-radius: var(--radius-xs);
      background: var(--color-primary-soft);
      color: var(--color-primary);
      font-weight: 900;
      font-size: 12px;
    }

    .rank-item a {
      font-size: 14px;
      font-weight: 750;
      line-height: 1.42;
    }

    .rank-item span {
      display: block;
      color: var(--color-light);
      font-size: 12px;
      margin-top: 3px;
    }

    .security {
      background: linear-gradient(180deg, #f6f9fd 0%, #fafdff 100%);
    }

    .security-band {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 22px;
      align-items: stretch;
    }

    .security-card {
      padding: 24px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      background: #fff;
      box-shadow: var(--shadow-sm);
    }

    .security-card h3 {
      font-size: 22px;
      margin-bottom: 9px;
    }

    .security-card p {
      color: var(--color-muted);
      font-size: 14px;
      margin-bottom: 18px;
    }

    .check-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
    }

    .check-item {
      padding: 13px;
      border: 1px solid var(--color-border-soft);
      border-radius: var(--radius-sm);
      background: var(--color-surface-2);
      color: var(--color-muted);
      font-size: 13px;
      font-weight: 650;
    }

    .app-section {
      background: #fff;
    }

    .app-panel {
      display: grid;
      grid-template-columns: .98fr 1.02fr;
      gap: 28px;
      align-items: center;
      padding: 34px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      background:
        linear-gradient(135deg, #ffffff 0%, #f4f9ff 58%, #eefbff 100%);
      box-shadow: var(--shadow-lg);
    }

    .app-panel h2 {
      font-size: clamp(26px, 3vw, 38px);
      line-height: 1.25;
      margin-bottom: 12px;
    }

    .app-panel p {
      color: var(--color-muted);
      margin-bottom: 20px;
    }

    .device-matrix {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
    }

    .device-card {
      padding: 18px;
      min-height: 118px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      background: rgba(255,255,255,.78);
    }

    .device-card .icon {
      width: 34px;
      height: 34px;
      border-radius: var(--radius-xs);
      display: grid;
      place-items: center;
      color: var(--color-primary);
      background: var(--color-primary-soft);
      margin-bottom: 12px;
      font-weight: 900;
    }

    .device-card h3 {
      font-size: 16px;
      margin-bottom: 5px;
    }

    .device-card p {
      font-size: 13px;
      margin: 0;
    }

    .contact {
      padding-bottom: 86px;
      background: linear-gradient(180deg, #ffffff 0%, #f6f9fd 100%);
    }

    .contact-grid {
      display: grid;
      grid-template-columns: .9fr 1.1fr;
      gap: 24px;
      align-items: stretch;
    }

    .contact-card,
    .form-card {
      padding: 26px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      background: #fff;
      box-shadow: var(--shadow-sm);
    }

    .contact-card h2,
    .form-card h2 {
      font-size: 28px;
      line-height: 1.3;
      margin-bottom: 12px;
    }

    .contact-card p {
      color: var(--color-muted);
      margin-bottom: 18px;
    }

    .contact-lines {
      display: grid;
      gap: 12px;
    }

    .contact-line {
      padding: 14px;
      border: 1px solid var(--color-border-soft);
      border-radius: var(--radius-sm);
      background: var(--color-surface-2);
    }

    .contact-line strong {
      display: block;
      font-size: 14px;
      margin-bottom: 3px;
    }

    .contact-line span {
      color: var(--color-muted);
      font-size: 13px;
    }

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

    .field {
      display: grid;
      gap: 7px;
    }

    .field.full {
      grid-column: 1 / -1;
    }

    .field label {
      color: var(--color-text);
      font-size: 13px;
      font-weight: 800;
    }

    .field input,
    .field select,
    .field textarea {
      min-height: 44px;
      padding: 10px 12px;
    }

    .field textarea {
      min-height: 104px;
      resize: vertical;
    }

    .form-hint {
      color: var(--color-light);
      font-size: 12px;
      margin-top: 10px;
    }

    .site-footer {
      background: #10233f;
      color: #dbe8f7;
      padding: 42px 0 26px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.2fr .8fr;
      gap: 28px;
      align-items: start;
      padding-bottom: 28px;
      border-bottom: 1px solid rgba(255,255,255,.12);
    }

    .footer-brand {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      font-size: 18px;
      font-weight: 850;
      margin-bottom: 12px;
    }

    .footer-brand .brand-mark {
      box-shadow: none;
    }

    .footer-desc {
      max-width: 620px;
      color: #a9bdd6;
      font-size: 14px;
    }

    .footer-links {
      display: flex;
      justify-content: flex-end;
      flex-wrap: wrap;
      gap: 10px;
    }

    .footer-links a {
      padding: 8px 10px;
      border-radius: var(--radius-xs);
      color: #c9d8ea;
      font-size: 14px;
    }

    .footer-links a:hover,
    .footer-links a.active {
      color: #fff;
      background: rgba(255,255,255,.08);
    }

    .copyright {
      display: flex;
      justify-content: space-between;
      gap: 16px;
      flex-wrap: wrap;
      padding-top: 20px;
      color: #8fa5c0;
      font-size: 13px;
    }

    .mobile-tabs {
      display: none;
    }

    .loading-state {
      pointer-events: none;
      color: var(--color-light);
      background: #f2f6fb;
      border-color: var(--color-border-soft);
    }

    .empty-state {
      padding: 24px;
      border: 1px dashed var(--color-border);
      border-radius: var(--radius-md);
      background: #fff;
      color: var(--color-muted);
      text-align: center;
    }

    @media (max-width: 1024px) {
      .mini-search {
        width: 170px;
      }

      .section-head,
      .update-layout,
      .answer-wrap,
      .news-grid,
      .security-band,
      .app-panel,
      .contact-grid {
        grid-template-columns: 1fr;
      }

      .section-head {
        align-items: start;
      }

      .side-panel {
        position: static;
      }
    }

    @media (max-width: 768px) {
      body {
        padding-bottom: 72px;
      }

      .container {
        width: min(100% - 28px, var(--container));
      }

      .site-header {
        height: 62px;
      }

      .nav-wrap {
        height: 62px;
      }

      .brand-text {
        max-width: 210px;
        font-size: 15px;
      }

      .desktop-nav,
      .nav-actions {
        display: none;
      }

      section {
        padding: 54px 0;
      }

      .hero {
        min-height: auto;
        padding: 28px 0 42px;
      }

      .hero-panel {
        padding: 30px 18px;
      }

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

      .hero-search {
        grid-template-columns: 1fr;
      }

      .hero-search .btn {
        width: 100%;
      }

      .hero-stats,
      .feature-grid,
      .check-grid,
      .device-matrix,
      .form-grid {
        grid-template-columns: 1fr;
      }

      .headline-item {
        grid-template-columns: 1fr;
        gap: 8px;
      }

      .meta {
        white-space: normal;
      }

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

      .footer-links {
        justify-content: flex-start;
      }

      .mobile-tabs {
        position: fixed;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 60;
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 0;
        padding: 7px 10px calc(7px + env(safe-area-inset-bottom));
        background: rgba(255,255,255,.94);
        border-top: 1px solid var(--color-border);
        box-shadow: 0 -10px 26px rgba(30, 64, 120, .08);
        backdrop-filter: blur(16px);
      }

      .mobile-tabs a {
        min-height: 50px;
        border-radius: var(--radius-sm);
        display: grid;
        place-items: center;
        gap: 2px;
        color: var(--color-muted);
        font-size: 12px;
        font-weight: 750;
      }

      .mobile-tabs a i {
        font-style: normal;
        font-size: 18px;
        line-height: 1;
      }

      .mobile-tabs a:hover,
      .mobile-tabs a.active {
        color: var(--color-primary);
        background: var(--color-primary-soft);
      }
    }

    @media (max-width: 520px) {
      .brand-mark {
        width: 30px;
        height: 30px;
      }

      .brand-text {
        max-width: 180px;
      }

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

      .section-title,
      .answer-note h2,
      .contact-card h2,
      .form-card h2 {
        font-size: 25px;
      }

      .hero-actions,
      .app-panel .hero-actions {
        align-items: stretch;
        flex-direction: column;
      }

      .btn {
        width: 100%;
      }

      .update-item {
        grid-template-columns: 1fr;
      }

      .app-panel,
      .contact-card,
      .form-card {
        padding: 20px;
      }

      .copyright {
        flex-direction: column;
      }
    }

/* roulang page: category1 */
:root {
      --color-primary: #2563eb;
      --color-primary-dark: #1d4ed8;
      --color-primary-soft: #eaf2ff;
      --color-accent: #0891b2;
      --color-accent-soft: #e6f7fb;
      --color-purple-soft: #f3f1ff;
      --color-bg: #f6f9fd;
      --color-surface: #ffffff;
      --color-surface-2: #f9fbff;
      --color-text: #152033;
      --color-muted: #64748b;
      --color-light: #94a3b8;
      --color-border: #dbe5f2;
      --color-border-soft: #edf2f8;
      --color-success: #0f9f6e;
      --color-warning: #b7791f;
      --color-error: #dc2626;
      --shadow-sm: 0 4px 12px rgba(15, 23, 42, 0.05);
      --shadow-md: 0 14px 32px rgba(37, 99, 235, 0.10);
      --shadow-lg: 0 22px 56px rgba(15, 23, 42, 0.12);
      --radius-sm: 6px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --container: 1180px;
      --header-height: 76px;
      --transition: 180ms ease;
    }

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

    html {
      scroll-behavior: smooth;
      text-size-adjust: 100%;
    }

    body {
      min-height: 100vh;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
      line-height: 1.65;
      color: var(--color-text);
      background: linear-gradient(180deg, #f8fbff 0%, var(--color-bg) 46%, #ffffff 100%);
      padding-bottom: 0;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color var(--transition), background var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
    }

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

    button,
    input,
    select,
    textarea {
      font: inherit;
    }

    button,
    select {
      cursor: pointer;
    }

    button:disabled,
    input:disabled,
    select:disabled {
      cursor: not-allowed;
      opacity: 0.58;
    }

    :focus-visible {
      outline: 3px solid rgba(37, 99, 235, 0.28);
      outline-offset: 3px;
    }

    .container {
      width: min(100% - 40px, var(--container));
      margin-inline: auto;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(219, 229, 242, 0.86);
    }

    .nav-wrap {
      height: var(--header-height);
      display: flex;
      align-items: center;
      gap: 28px;
    }

    .brand,
    .footer-brand {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      color: var(--color-text);
      white-space: nowrap;
    }

    .brand-mark {
      width: 34px;
      height: 34px;
      display: inline-grid;
      place-items: center;
      border-radius: var(--radius-sm);
      color: #fff;
      background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
      box-shadow: 0 8px 18px rgba(37, 99, 235, 0.24);
      font-size: 17px;
      flex: 0 0 auto;
    }

    .brand-text {
      font-size: 17px;
      letter-spacing: 0;
    }

    .desktop-nav {
      display: flex;
      align-items: center;
      gap: 6px;
      margin-left: 8px;
    }

    .desktop-nav a,
    .footer-links a {
      color: var(--color-muted);
      font-weight: 650;
      border-radius: var(--radius-sm);
    }

    .desktop-nav a {
      padding: 10px 14px;
      position: relative;
    }

    .desktop-nav a:hover,
    .desktop-nav a.active {
      color: var(--color-primary);
      background: var(--color-primary-soft);
    }

    .desktop-nav a:active {
      transform: translateY(1px);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-left: auto;
    }

    .mini-search {
      width: 248px;
      display: flex;
      align-items: center;
      gap: 8px;
      padding: 9px 12px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      background: var(--color-surface-2);
      color: var(--color-light);
      transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
    }

    .mini-search:focus-within {
      border-color: rgba(37, 99, 235, 0.55);
      background: #fff;
      box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.08);
    }

    .mini-search input {
      width: 100%;
      border: 0;
      outline: 0;
      background: transparent;
      color: var(--color-text);
      font-size: 14px;
    }

    .mini-search input::placeholder {
      color: var(--color-light);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      min-height: 42px;
      padding: 10px 16px;
      border: 1px solid transparent;
      border-radius: var(--radius-sm);
      font-weight: 750;
      color: var(--color-text);
      background: #fff;
      box-shadow: var(--shadow-sm);
      transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition), color var(--transition);
      white-space: nowrap;
    }

    .btn:hover {
      transform: translateY(-1px);
      box-shadow: var(--shadow-md);
    }

    .btn:active {
      transform: translateY(0);
      box-shadow: var(--shadow-sm);
    }

    .btn-primary {
      color: #fff;
      background: var(--color-primary);
      border-color: var(--color-primary);
    }

    .btn-primary:hover {
      background: var(--color-primary-dark);
      border-color: var(--color-primary-dark);
    }

    .btn-secondary {
      color: var(--color-primary);
      background: #fff;
      border-color: rgba(37, 99, 235, 0.24);
    }

    .btn-secondary:hover {
      background: var(--color-primary-soft);
      border-color: rgba(37, 99, 235, 0.42);
    }

    .btn-ghost {
      color: var(--color-muted);
      background: transparent;
      border-color: var(--color-border);
      box-shadow: none;
    }

    .btn-ghost:hover {
      color: var(--color-primary);
      background: var(--color-primary-soft);
    }

    .page-main {
      overflow: hidden;
    }

    .breadcrumb-wrap {
      padding: 26px 0 0;
    }

    .breadcrumb {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 8px;
      color: var(--color-muted);
      font-size: 14px;
    }

    .breadcrumb a {
      color: var(--color-primary);
      font-weight: 650;
    }

    .breadcrumb a:hover {
      text-decoration: underline;
      text-underline-offset: 4px;
    }

    .category-hero {
      padding: 24px 0 46px;
    }

    .category-hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.08fr) minmax(340px, 0.72fr);
      gap: 34px;
      align-items: stretch;
    }

    .category-title {
      padding-top: 24px;
    }

    .kicker {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 10px;
      border: 1px solid rgba(8, 145, 178, 0.24);
      border-radius: 999px;
      background: var(--color-accent-soft);
      color: #0e7490;
      font-size: 13px;
      font-weight: 750;
      margin-bottom: 18px;
    }

    .pulse-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--color-success);
      box-shadow: 0 0 0 5px rgba(15, 159, 110, 0.12);
    }

    h1 {
      max-width: 760px;
      font-size: clamp(34px, 5vw, 54px);
      line-height: 1.12;
      letter-spacing: 0;
      color: var(--color-text);
      margin-bottom: 18px;
    }

    .lead {
      max-width: 720px;
      color: var(--color-muted);
      font-size: 18px;
      line-height: 1.8;
      margin-bottom: 24px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-bottom: 26px;
    }

    .hero-note-list {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 12px;
      max-width: 760px;
    }

    .hero-note {
      border: 1px solid var(--color-border-soft);
      border-radius: var(--radius-md);
      background: rgba(255, 255, 255, 0.72);
      padding: 12px;
      box-shadow: var(--shadow-sm);
    }

    .hero-note strong {
      display: block;
      color: var(--color-primary);
      font-size: 18px;
      line-height: 1.2;
    }

    .hero-note span {
      display: block;
      color: var(--color-muted);
      font-size: 13px;
      margin-top: 4px;
    }

    .preview-panel {
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      background: var(--color-surface);
      box-shadow: var(--shadow-lg);
      overflow: hidden;
      align-self: stretch;
    }

    .preview-cover {
      min-height: 220px;
      position: relative;
      padding: 18px;
      background:
        linear-gradient(135deg, rgba(37, 99, 235, 0.94), rgba(8, 145, 178, 0.82)),
        repeating-linear-gradient(90deg, rgba(255,255,255,0.10) 0 1px, transparent 1px 64px);
      color: #fff;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .cover-top {
      display: flex;
      justify-content: space-between;
      gap: 12px;
      align-items: flex-start;
    }

    .cover-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 10px;
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.16);
      border: 1px solid rgba(255, 255, 255, 0.24);
      font-size: 13px;
      font-weight: 750;
    }

    .countdown {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 8px;
      min-width: 176px;
    }

    .count-box {
      border-radius: var(--radius-sm);
      background: rgba(255, 255, 255, 0.16);
      border: 1px solid rgba(255, 255, 255, 0.22);
      padding: 8px 6px;
      text-align: center;
    }

    .count-box strong {
      display: block;
      font-size: 18px;
      line-height: 1.1;
    }

    .count-box span {
      font-size: 12px;
      opacity: 0.86;
    }

    .cover-title {
      margin-top: 42px;
    }

    .cover-title h2 {
      font-size: 24px;
      line-height: 1.3;
      margin-bottom: 8px;
    }

    .cover-title p {
      color: rgba(255, 255, 255, 0.82);
      font-size: 14px;
      line-height: 1.75;
    }

    .preview-body {
      padding: 18px;
    }

    .subscribe-row {
      display: grid;
      grid-template-columns: minmax(0, 1fr) auto;
      gap: 10px;
      margin-bottom: 16px;
    }

    .input-control {
      min-height: 42px;
      width: 100%;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      background: var(--color-surface-2);
      padding: 10px 12px;
      color: var(--color-text);
      outline: 0;
      transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
    }

    .input-control:focus {
      border-color: rgba(37, 99, 235, 0.55);
      background: #fff;
      box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.08);
    }

    .input-control.error {
      border-color: rgba(220, 38, 38, 0.55);
      background: #fff7f7;
    }

    .signal-list {
      display: grid;
      gap: 10px;
    }

    .signal-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 14px;
      padding: 10px 12px;
      border: 1px solid var(--color-border-soft);
      border-radius: var(--radius-sm);
      background: var(--color-surface-2);
    }

    .signal-item span {
      color: var(--color-muted);
      font-size: 14px;
    }

    .signal-item strong {
      color: var(--color-text);
      font-size: 14px;
    }

    .section {
      padding: 54px 0;
    }

    .section.alt {
      background: rgba(255, 255, 255, 0.62);
      border-top: 1px solid var(--color-border-soft);
      border-bottom: 1px solid var(--color-border-soft);
    }

    .section-heading {
      max-width: 760px;
      margin-bottom: 24px;
    }

    .section-heading.compact {
      margin-bottom: 18px;
    }

    .section-heading h2 {
      font-size: clamp(26px, 3vw, 36px);
      line-height: 1.25;
      margin-bottom: 10px;
      color: var(--color-text);
    }

    .section-heading p {
      color: var(--color-muted);
      font-size: 16px;
    }

    .filter-shell {
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      background: var(--color-surface);
      box-shadow: var(--shadow-md);
      padding: 18px;
    }

    .filter-top {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding-bottom: 16px;
      border-bottom: 1px solid var(--color-border-soft);
    }

    .filter-title strong {
      display: block;
      font-size: 18px;
      line-height: 1.35;
    }

    .filter-title span {
      color: var(--color-muted);
      font-size: 14px;
    }

    .filter-controls {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-wrap: wrap;
    }

    .select-control {
      min-height: 40px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      background: #fff;
      color: var(--color-text);
      padding: 8px 32px 8px 12px;
      outline: 0;
      transition: border-color var(--transition), box-shadow var(--transition);
    }

    .select-control:hover,
    .select-control:focus {
      border-color: rgba(37, 99, 235, 0.55);
      box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.06);
    }

    .view-toggle {
      display: inline-flex;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      overflow: hidden;
      background: #fff;
    }

    .view-toggle button {
      min-width: 40px;
      min-height: 38px;
      border: 0;
      border-right: 1px solid var(--color-border);
      background: transparent;
      color: var(--color-muted);
      font-weight: 800;
    }

    .view-toggle button:last-child {
      border-right: 0;
    }

    .view-toggle button:hover,
    .view-toggle button.active {
      color: var(--color-primary);
      background: var(--color-primary-soft);
    }

    .tag-row {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      padding-top: 16px;
    }

    .tag,
    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      min-height: 30px;
      padding: 6px 10px;
      border: 1px solid var(--color-border);
      border-radius: 999px;
      background: #fff;
      color: var(--color-muted);
      font-size: 13px;
      font-weight: 700;
      transition: color var(--transition), background var(--transition), border-color var(--transition), transform var(--transition);
    }

    .tag:hover,
    .tag.active {
      color: var(--color-primary);
      background: var(--color-primary-soft);
      border-color: rgba(37, 99, 235, 0.26);
      transform: translateY(-1px);
    }

    .badge.blue {
      color: var(--color-primary);
      background: var(--color-primary-soft);
      border-color: rgba(37, 99, 235, 0.18);
    }

    .badge.cyan {
      color: #0e7490;
      background: var(--color-accent-soft);
      border-color: rgba(8, 145, 178, 0.18);
    }

    .badge.gray {
      color: var(--color-muted);
      background: var(--color-surface-2);
    }

    .content-layout {
      display: grid;
      grid-template-columns: minmax(0, 1fr) 320px;
      gap: 24px;
      align-items: start;
    }

    .list-stack {
      display: grid;
      gap: 14px;
    }

    .content-card {
      min-height: 176px;
      display: grid;
      grid-template-columns: 164px minmax(0, 1fr) auto;
      gap: 18px;
      align-items: stretch;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      background: var(--color-surface);
      box-shadow: var(--shadow-sm);
      padding: 14px;
      transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    }

    .content-card:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
      border-color: rgba(37, 99, 235, 0.28);
    }

    .thumb {
      border-radius: var(--radius-md);
      background:
        linear-gradient(145deg, rgba(37, 99, 235, 0.16), rgba(8, 145, 178, 0.13)),
        linear-gradient(180deg, #ffffff, #edf5ff);
      border: 1px solid var(--color-border-soft);
      position: relative;
      overflow: hidden;
      min-height: 148px;
    }

    .thumb::before,
    .thumb::after {
      content: "";
      position: absolute;
      inset: auto 14px 18px 14px;
      height: 10px;
      border-radius: 999px;
      background: rgba(37, 99, 235, 0.22);
      box-shadow: 0 -30px 0 rgba(8, 145, 178, 0.16), 0 -60px 0 rgba(148, 163, 184, 0.14);
    }

    .thumb::after {
      width: 48px;
      height: 48px;
      inset: 20px auto auto 20px;
      border-radius: 50%;
      background: #fff;
      box-shadow: 0 0 0 8px rgba(37, 99, 235, 0.10);
    }

    .card-main {
      min-width: 0;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      gap: 12px;
    }

    .card-main h2 {
      font-size: 20px;
      line-height: 1.35;
      color: var(--color-text);
      margin-bottom: 6px;
    }

    .card-main h2 a:hover {
      color: var(--color-primary);
      text-decoration: underline;
      text-underline-offset: 4px;
    }

    .card-main p {
      color: var(--color-muted);
      font-size: 15px;
      line-height: 1.75;
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      overflow: hidden;
    }

    .meta-row {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 10px;
      color: var(--color-light);
      font-size: 13px;
    }

    .meta-row span {
      display: inline-flex;
      align-items: center;
      gap: 5px;
    }

    .card-side {
      width: 124px;
      display: flex;
      flex-direction: column;
      align-items: flex-end;
      justify-content: space-between;
      gap: 12px;
      border-left: 1px solid var(--color-border-soft);
      padding-left: 14px;
    }

    .heat {
      text-align: right;
    }

    .heat strong {
      display: block;
      color: var(--color-primary);
      font-size: 24px;
      line-height: 1.1;
    }

    .heat span {
      color: var(--color-muted);
      font-size: 13px;
    }

    .load-more {
      display: flex;
      justify-content: center;
      padding-top: 10px;
    }

    .side-panel {
      display: grid;
      gap: 16px;
      position: sticky;
      top: 96px;
    }

    .side-card {
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      background: var(--color-surface);
      box-shadow: var(--shadow-sm);
      padding: 18px;
    }

    .side-card h3 {
      font-size: 18px;
      margin-bottom: 12px;
      line-height: 1.35;
    }

    .hot-list {
      display: grid;
      gap: 10px;
      list-style: none;
    }

    .hot-list a {
      display: flex;
      justify-content: space-between;
      gap: 12px;
      padding: 10px 0;
      border-bottom: 1px solid var(--color-border-soft);
      color: var(--color-muted);
      font-size: 14px;
    }

    .hot-list li:last-child a {
      border-bottom: 0;
      padding-bottom: 0;
    }

    .hot-list a:hover {
      color: var(--color-primary);
    }

    .hot-list strong {
      color: var(--color-text);
      font-weight: 750;
    }

    .notice {
      padding: 14px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(8, 145, 178, 0.20);
      background: var(--color-accent-soft);
      color: #155e75;
      font-size: 14px;
      line-height: 1.75;
    }

    .stats-band {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      background: var(--color-surface);
      box-shadow: var(--shadow-md);
      overflow: hidden;
    }

    .stat-item {
      padding: 22px;
      border-right: 1px solid var(--color-border-soft);
    }

    .stat-item:last-child {
      border-right: 0;
    }

    .stat-item strong {
      display: block;
      color: var(--color-primary);
      font-size: 30px;
      line-height: 1.1;
      margin-bottom: 6px;
    }

    .stat-item span {
      display: block;
      color: var(--color-text);
      font-weight: 750;
      margin-bottom: 4px;
    }

    .stat-item p {
      color: var(--color-muted);
      font-size: 14px;
      line-height: 1.65;
    }

    .recommend-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 20px;
    }

    .recommend-card {
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      background: var(--color-surface);
      box-shadow: var(--shadow-sm);
      padding: 22px;
    }

    .recommend-card.featured {
      display: grid;
      grid-template-columns: minmax(0, 1fr) 180px;
      gap: 20px;
      align-items: center;
      background: linear-gradient(180deg, #ffffff, #f7fbff);
    }

    .recommend-card h3 {
      font-size: 22px;
      line-height: 1.35;
      margin-bottom: 10px;
    }

    .recommend-card p {
      color: var(--color-muted);
      margin-bottom: 16px;
    }

    .mini-matrix {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 10px;
    }

    .matrix-cell {
      min-height: 78px;
      border: 1px solid var(--color-border-soft);
      border-radius: var(--radius-md);
      background: #fff;
      padding: 12px;
    }

    .matrix-cell strong {
      display: block;
      color: var(--color-primary);
      font-size: 18px;
    }

    .matrix-cell span {
      color: var(--color-muted);
      font-size: 13px;
    }

    .guide-steps {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 14px;
      counter-reset: step;
    }

    .step-card {
      counter-increment: step;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      background: var(--color-surface);
      box-shadow: var(--shadow-sm);
      padding: 20px;
      position: relative;
    }

    .step-card::before {
      content: counter(step, decimal-leading-zero);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 38px;
      height: 30px;
      border-radius: var(--radius-sm);
      background: var(--color-primary-soft);
      color: var(--color-primary);
      font-weight: 850;
      margin-bottom: 16px;
    }

    .step-card h3 {
      font-size: 18px;
      margin-bottom: 8px;
    }

    .step-card p {
      color: var(--color-muted);
      font-size: 14px;
    }

    .faq-wrap {
      display: grid;
      gap: 12px;
      max-width: 900px;
    }

    .faq-item {
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      background: var(--color-surface);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }

    .faq-item summary {
      list-style: none;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      padding: 18px 20px;
      cursor: pointer;
      font-weight: 800;
      color: var(--color-text);
    }

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

    .faq-item summary::after {
      content: "+";
      width: 26px;
      height: 26px;
      display: inline-grid;
      place-items: center;
      border-radius: 50%;
      background: var(--color-primary-soft);
      color: var(--color-primary);
      font-weight: 900;
      flex: 0 0 auto;
      transition: transform var(--transition), background var(--transition);
    }

    .faq-item[open] summary {
      color: var(--color-primary);
    }

    .faq-item[open] summary::after {
      content: "−";
      background: var(--color-primary);
      color: #fff;
    }

    .faq-answer {
      padding: 0 20px 20px;
      color: var(--color-muted);
      line-height: 1.85;
    }

    .contact-panel {
      display: grid;
      grid-template-columns: minmax(0, 0.85fr) minmax(320px, 1.15fr);
      gap: 24px;
      align-items: stretch;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      background: linear-gradient(135deg, #ffffff, #f7fbff);
      box-shadow: var(--shadow-lg);
      padding: 24px;
    }

    .contact-copy h2 {
      font-size: clamp(26px, 3vw, 36px);
      line-height: 1.25;
      margin-bottom: 12px;
    }

    .contact-copy p {
      color: var(--color-muted);
      margin-bottom: 18px;
    }

    .contact-points {
      display: grid;
      gap: 10px;
      list-style: none;
    }

    .contact-points li {
      display: flex;
      gap: 10px;
      color: var(--color-muted);
    }

    .contact-points li::before {
      content: "✓";
      width: 22px;
      height: 22px;
      display: inline-grid;
      place-items: center;
      border-radius: 50%;
      background: var(--color-primary-soft);
      color: var(--color-primary);
      font-weight: 900;
      flex: 0 0 auto;
      margin-top: 2px;
    }

    .contact-form {
      display: grid;
      gap: 12px;
      padding: 18px;
      border: 1px solid var(--color-border-soft);
      border-radius: var(--radius-lg);
      background: #fff;
    }

    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
    }

    .form-field {
      display: grid;
      gap: 6px;
    }

    .form-field label {
      color: var(--color-text);
      font-size: 14px;
      font-weight: 750;
    }

    textarea.input-control {
      resize: vertical;
      min-height: 104px;
    }

    .form-tip {
      color: var(--color-muted);
      font-size: 13px;
    }

    .site-footer {
      margin-top: 34px;
      padding: 42px 0 96px;
      background: #0f172a;
      color: #dbeafe;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: minmax(0, 1fr) auto;
      gap: 28px;
      align-items: start;
      padding-bottom: 24px;
      border-bottom: 1px solid rgba(219, 234, 254, 0.16);
    }

    .footer-brand {
      color: #fff;
      margin-bottom: 12px;
    }

    .footer-desc {
      max-width: 620px;
      color: #a9b8d4;
      font-size: 14px;
      line-height: 1.8;
    }

    .footer-links {
      display: flex;
      gap: 10px;
      flex-wrap: wrap;
      justify-content: flex-end;
    }

    .footer-links a {
      padding: 8px 12px;
      color: #b9c7dd;
      border: 1px solid rgba(219, 234, 254, 0.14);
    }

    .footer-links a:hover,
    .footer-links a.active {
      color: #fff;
      background: rgba(37, 99, 235, 0.22);
      border-color: rgba(147, 197, 253, 0.34);
    }

    .copyright {
      display: flex;
      justify-content: space-between;
      gap: 16px;
      flex-wrap: wrap;
      padding-top: 18px;
      color: #8fa1bf;
      font-size: 13px;
    }

    .mobile-tabs {
      display: none;
      position: fixed;
      left: 0;
      right: 0;
      bottom: 0;
      z-index: 120;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(16px);
      border-top: 1px solid var(--color-border);
      box-shadow: 0 -10px 28px rgba(15, 23, 42, 0.08);
      padding: 7px max(12px, env(safe-area-inset-left)) calc(7px + env(safe-area-inset-bottom)) max(12px, env(safe-area-inset-right));
    }

    .mobile-tabs a {
      flex: 1;
      display: grid;
      place-items: center;
      gap: 3px;
      color: var(--color-muted);
      font-size: 12px;
      font-weight: 750;
      border-radius: var(--radius-sm);
      padding: 6px 4px;
    }

    .mobile-tabs a:hover,
    .mobile-tabs a.active {
      color: var(--color-primary);
      background: var(--color-primary-soft);
    }

    .tab-icon {
      font-size: 18px;
      line-height: 1;
    }

    .empty-state {
      display: none;
      padding: 28px;
      border: 1px dashed var(--color-border);
      border-radius: var(--radius-lg);
      background: var(--color-surface-2);
      color: var(--color-muted);
      text-align: center;
    }

    .loading-state {
      pointer-events: none;
      opacity: 0.74;
    }

    @media (max-width: 1024px) {
      .nav-wrap {
        gap: 16px;
      }

      .mini-search {
        width: 196px;
      }

      .category-hero-grid,
      .content-layout,
      .contact-panel {
        grid-template-columns: 1fr;
      }

      .side-panel {
        position: static;
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .stats-band,
      .guide-steps {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .stat-item:nth-child(2) {
        border-right: 0;
      }

      .stat-item:nth-child(1),
      .stat-item:nth-child(2) {
        border-bottom: 1px solid var(--color-border-soft);
      }

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

    @media (max-width: 768px) {
      body {
        padding-bottom: 72px;
      }

      .container {
        width: min(100% - 28px, var(--container));
      }

      .site-header {
        position: sticky;
      }

      .nav-wrap {
        height: 64px;
      }

      .brand-text {
        max-width: 180px;
        overflow: hidden;
        text-overflow: ellipsis;
      }

      .desktop-nav {
        display: none;
      }

      .nav-actions {
        margin-left: auto;
      }

      .mini-search {
        display: none;
      }

      .nav-actions .btn {
        min-height: 38px;
        padding: 8px 12px;
        font-size: 14px;
      }

      .mobile-tabs {
        display: flex;
      }

      .breadcrumb-wrap {
        padding-top: 18px;
      }

      .category-hero {
        padding: 18px 0 36px;
      }

      .category-title {
        padding-top: 8px;
      }

      h1 {
        font-size: 34px;
      }

      .lead {
        font-size: 16px;
      }

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

      .preview-cover {
        min-height: 236px;
      }

      .cover-top {
        flex-direction: column;
      }

      .countdown {
        width: 100%;
      }

      .filter-top {
        align-items: flex-start;
        flex-direction: column;
      }

      .filter-controls,
      .select-control {
        width: 100%;
      }

      .view-toggle {
        width: 100%;
      }

      .view-toggle button {
        flex: 1;
      }

      .content-card {
        grid-template-columns: 118px minmax(0, 1fr);
      }

      .thumb {
        min-height: 132px;
      }

      .card-side {
        grid-column: 1 / -1;
        width: 100%;
        flex-direction: row;
        align-items: center;
        border-left: 0;
        border-top: 1px solid var(--color-border-soft);
        padding-left: 0;
        padding-top: 12px;
      }

      .heat {
        text-align: left;
      }

      .side-panel,
      .stats-band,
      .guide-steps,
      .form-row {
        grid-template-columns: 1fr;
      }

      .stat-item {
        border-right: 0;
        border-bottom: 1px solid var(--color-border-soft);
      }

      .stat-item:last-child {
        border-bottom: 0;
      }

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

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

      .footer-links {
        justify-content: flex-start;
      }

      .site-footer {
        padding-bottom: 112px;
      }
    }

    @media (max-width: 520px) {
      .container {
        width: min(100% - 22px, var(--container));
      }

      .brand-mark {
        width: 31px;
        height: 31px;
      }

      .brand-text {
        max-width: 156px;
        font-size: 15px;
      }

      .nav-actions .btn {
        padding-inline: 10px;
      }

      h1 {
        font-size: 30px;
      }

      .section {
        padding: 42px 0;
      }

      .hero-actions,
      .subscribe-row {
        grid-template-columns: 1fr;
        display: grid;
      }

      .hero-actions .btn,
      .subscribe-row .btn {
        width: 100%;
      }

      .content-card {
        grid-template-columns: 1fr;
        min-height: auto;
      }

      .thumb {
        min-height: 154px;
      }

      .card-main h2 {
        font-size: 19px;
      }

      .tag-row {
        gap: 8px;
      }

      .contact-panel,
      .filter-shell,
      .contact-form {
        padding: 16px;
      }

      .mini-matrix {
        grid-template-columns: 1fr;
      }

      .copyright {
        flex-direction: column;
      }
    }