/* roulang page: index */
:root {
      --ink: #202124;
      --muted: #65676b;
      --soft: #8a8d91;
      --brand: #e5391f;
      --brand-dark: #c92f18;
      --orange: #ff8a00;
      --green: #168a4a;
      --warn: #b45309;
      --bg: #fff9f2;
      --paper: #ffffff;
      --line: #e6e1d8;
      --line2: #e5e7eb;
      --gray: #f5f6f8;
      --shadow: 0 8px 24px rgba(32, 33, 36, .08);
      --shadow-strong: 0 14px 34px rgba(229, 57, 31, .18);
      --radius: 8px;
      --radius-lg: 10px;
      --side: 108px;
      --container: 1220px;
      --font: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      font-family: var(--font);
      color: var(--ink);
      background: var(--bg);
      line-height: 1.7;
      font-size: 16px;
    }

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

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

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

    button {
      border: 0;
      cursor: pointer;
    }

    :focus-visible {
      outline: 3px solid rgba(229, 57, 31, .25);
      outline-offset: 3px;
    }

    .site-shell {
      min-height: 100vh;
      display: grid;
      grid-template-columns: var(--side) minmax(0, 1fr);
    }

    .side-nav {
      position: sticky;
      top: 0;
      height: 100vh;
      background: var(--ink);
      color: #fff;
      padding: 22px 14px;
      display: flex;
      flex-direction: column;
      z-index: 30;
      border-right: 1px solid rgba(255,255,255,.08);
    }

    .brand {
      min-height: 84px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      align-items: center;
      justify-content: flex-start;
      text-align: center;
      font-weight: 800;
      line-height: 1.25;
      font-size: 13px;
    }

    .brand-mark {
      width: 38px;
      height: 38px;
      border-radius: 8px;
      display: grid;
      place-items: center;
      background: linear-gradient(135deg, var(--brand), var(--orange));
      box-shadow: 0 10px 24px rgba(229,57,31,.28);
      flex: 0 0 auto;
    }

    .brand-mark i {
      width: 21px;
      height: 21px;
    }

    .nav-list {
      margin-top: 18px;
      display: grid;
      gap: 10px;
    }

    .nav-link {
      min-height: 68px;
      border-radius: var(--radius);
      display: grid;
      place-items: center;
      gap: 5px;
      padding: 9px 6px;
      color: rgba(255,255,255,.76);
      font-size: 13px;
      position: relative;
      transition: background .2s ease, color .2s ease, transform .2s ease;
    }

    .nav-link i {
      width: 20px;
      height: 20px;
      stroke-width: 1.75;
    }

    .nav-link:hover,
    .nav-link.active {
      background: rgba(255, 138, 0, .13);
      color: #fff;
      transform: translateY(-1px);
    }

    .nav-link.active::before {
      content: "";
      position: absolute;
      left: -14px;
      top: 14px;
      bottom: 14px;
      width: 4px;
      border-radius: 0 6px 6px 0;
      background: var(--brand);
    }

    .side-note {
      margin-top: auto;
      border-top: 1px solid rgba(255,255,255,.14);
      padding-top: 16px;
      color: rgba(255,255,255,.64);
      font-size: 12px;
      text-align: center;
    }

    .mobile-header {
      display: none;
      position: sticky;
      top: 0;
      z-index: 40;
      background: rgba(255, 249, 242, .96);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--line);
    }

    .mobile-bar {
      height: 62px;
      padding: 0 18px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 14px;
    }

    .mobile-brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      min-width: 0;
    }

    .mobile-brand span {
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
    }

    .mobile-brand .brand-mark {
      width: 34px;
      height: 34px;
      color: #fff;
    }

    .mobile-nav {
      display: flex;
      overflow-x: auto;
      gap: 10px;
      padding: 0 18px 12px;
      scrollbar-width: none;
    }

    .mobile-nav::-webkit-scrollbar {
      display: none;
    }

    .mobile-link {
      min-height: 44px;
      white-space: nowrap;
      display: inline-flex;
      align-items: center;
      gap: 7px;
      padding: 8px 14px;
      border-radius: 999px;
      border: 1px solid var(--line);
      background: #fff;
      color: var(--ink);
      font-size: 14px;
      transition: all .2s ease;
    }

    .mobile-link.active,
    .mobile-link:hover {
      border-color: rgba(229,57,31,.35);
      color: var(--brand);
      background: #fff1e8;
    }

    .page {
      min-width: 0;
    }

    .container {
      width: min(var(--container), calc(100% - 72px));
      margin: 0 auto;
    }

    .section {
      padding: 66px 0;
    }

    .section.gray {
      background: var(--gray);
    }

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

    .section-head {
      max-width: 780px;
      margin-bottom: 30px;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      border: 1px solid rgba(229,57,31,.22);
      background: #fff1e8;
      color: var(--brand);
      font-size: 13px;
      font-weight: 800;
      border-radius: 999px;
      padding: 5px 12px;
      margin-bottom: 14px;
    }

    .section h2 {
      margin: 0;
      font-size: 28px;
      line-height: 1.28;
      letter-spacing: 0;
    }

    .section-head p {
      margin: 12px 0 0;
      color: var(--muted);
      max-width: 720px;
    }

    .hero {
      padding: 28px 0 34px;
      background:
        linear-gradient(180deg, #fff 0%, #fff9f2 72%, #fff9f2 100%);
      border-bottom: 1px solid var(--line);
    }

    .hero-ribbon {
      min-height: 340px;
      border: 1px solid var(--line);
      background:
        linear-gradient(90deg, rgba(255,255,255,.96), rgba(255,249,242,.92)),
        repeating-linear-gradient(135deg, rgba(229,57,31,.055) 0, rgba(229,57,31,.055) 1px, transparent 1px, transparent 18px);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow);
    }

    .hero-topline {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding: 14px 22px;
      border-bottom: 1px solid var(--line);
      background: rgba(255,255,255,.76);
    }

    .hero-status {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 9px;
      color: var(--muted);
      font-size: 14px;
    }

    .status-dot {
      width: 8px;
      height: 8px;
      border-radius: 99px;
      background: var(--green);
      box-shadow: 0 0 0 4px rgba(22,138,74,.12);
    }

    .hero-main {
      display: grid;
      grid-template-columns: 1.08fr .92fr;
      gap: 28px;
      align-items: stretch;
      padding: 32px;
    }

    .hero-copy {
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .hero h1 {
      margin: 0;
      font-size: 42px;
      line-height: 1.18;
      letter-spacing: 0;
      max-width: 820px;
    }

    .hero-desc {
      margin: 18px 0 0;
      color: var(--muted);
      max-width: 720px;
      font-size: 17px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 24px;
    }

    .btn {
      min-height: 46px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 11px 18px;
      border-radius: var(--radius);
      font-weight: 800;
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease, color .2s ease;
      text-align: center;
      line-height: 1.25;
      border: 1px solid transparent;
      user-select: none;
    }

    .btn i {
      width: 18px;
      height: 18px;
      stroke-width: 1.85;
    }

    .btn-primary {
      background: var(--brand);
      color: #fff;
      box-shadow: var(--shadow-strong);
    }

    .btn-primary:hover {
      background: var(--brand-dark);
      transform: translateY(-2px);
      box-shadow: 0 18px 34px rgba(229,57,31,.25);
    }

    .btn-secondary {
      background: #fff;
      color: var(--ink);
      border-color: rgba(229,57,31,.34);
    }

    .btn-secondary:hover {
      background: #fff1e8;
      color: var(--brand);
      transform: translateY(-1px);
    }

    .btn-ghost {
      background: #fff;
      color: var(--ink);
      border-color: var(--line);
    }

    .btn-ghost:hover {
      border-color: rgba(229,57,31,.34);
      color: var(--brand);
      box-shadow: var(--shadow);
    }

    .trust-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 22px;
    }

    .tag,
    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      border-radius: 999px;
      padding: 5px 10px;
      font-size: 13px;
      font-weight: 700;
      line-height: 1.25;
    }

    .tag {
      background: #fff;
      border: 1px solid var(--line);
      color: var(--muted);
    }

    .badge.red {
      color: var(--brand);
      background: #fff1e8;
      border: 1px solid rgba(229,57,31,.18);
    }

    .badge.green {
      color: var(--green);
      background: #ecfdf3;
      border: 1px solid rgba(22,138,74,.16);
    }

    .badge.orange {
      color: var(--warn);
      background: #fff7e8;
      border: 1px solid rgba(255,138,0,.22);
    }

    .tool-panel {
      background: #fff;
      border: 1px solid var(--line);
      border-radius: var(--radius-lg);
      padding: 18px;
      box-shadow: 0 10px 26px rgba(32,33,36,.06);
    }

    .panel-title {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      padding-bottom: 14px;
      border-bottom: 1px solid var(--line2);
      font-weight: 800;
    }

    .step-list {
      display: grid;
      gap: 12px;
      margin-top: 16px;
    }

    .step {
      display: grid;
      grid-template-columns: 34px 1fr auto;
      gap: 12px;
      align-items: center;
      padding: 12px;
      border: 1px solid var(--line2);
      border-radius: var(--radius);
      background: #fff;
    }

    .step-num {
      width: 34px;
      height: 34px;
      border-radius: 8px;
      background: #fff1e8;
      color: var(--brand);
      display: grid;
      place-items: center;
      font-weight: 900;
    }

    .step strong {
      display: block;
      line-height: 1.3;
    }

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

    .mini-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 10px;
      margin-top: 14px;
    }

    .mini-cell {
      border-radius: var(--radius);
      background: var(--gray);
      border: 1px solid var(--line2);
      padding: 11px;
      font-size: 13px;
      color: var(--muted);
    }

    .mini-cell strong {
      display: block;
      color: var(--ink);
      font-size: 15px;
      margin-bottom: 2px;
    }

    .assurance {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 12px;
      margin-top: 18px;
    }

    .assurance-item {
      display: flex;
      align-items: center;
      gap: 10px;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: 13px;
      color: var(--ink);
      font-weight: 800;
      font-size: 14px;
    }

    .icon-box {
      width: 36px;
      height: 36px;
      border-radius: 8px;
      background: #fff1e8;
      color: var(--brand);
      display: grid;
      place-items: center;
      flex: 0 0 auto;
    }

    .icon-box i {
      width: 21px;
      height: 21px;
      stroke-width: 1.75;
    }

    .benefit-layout {
      display: grid;
      grid-template-columns: .84fr 1.16fr;
      gap: 24px;
      align-items: start;
    }

    .promo-card {
      background: var(--ink);
      color: #fff;
      border-radius: var(--radius-lg);
      padding: 24px;
      position: relative;
      overflow: hidden;
      min-height: 260px;
    }

    .promo-card::before {
      content: "";
      position: absolute;
      inset: 0 0 auto 0;
      height: 5px;
      background: linear-gradient(90deg, var(--brand), var(--orange));
    }

    .promo-card h3 {
      margin: 0;
      font-size: 24px;
      line-height: 1.3;
    }

    .promo-card p {
      color: rgba(255,255,255,.76);
      margin: 12px 0 0;
    }

    .promo-number {
      margin-top: 22px;
      font-size: 40px;
      line-height: 1;
      color: #fff;
      font-weight: 900;
    }

    .promo-number small {
      font-size: 15px;
      color: #ffd8bd;
    }

    .benefit-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 16px;
    }

    .card {
      background: #fff;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: 18px;
      box-shadow: 0 4px 14px rgba(32,33,36,.04);
      transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
      min-width: 0;
    }

    .card:hover {
      transform: translateY(-2px);
      border-color: rgba(229,57,31,.38);
      box-shadow: var(--shadow);
    }

    .card h3 {
      margin: 12px 0 6px;
      font-size: 18px;
      line-height: 1.35;
    }

    .card p {
      margin: 0;
      color: var(--muted);
      font-size: 15px;
    }

    .requirements-grid {
      display: grid;
      grid-template-columns: 1.25fr .75fr;
      gap: 22px;
      align-items: start;
    }

    .doc-table {
      border: 1px solid var(--line);
      border-radius: var(--radius);
      overflow: hidden;
      background: #fff;
      box-shadow: var(--shadow);
    }

    .doc-row {
      display: grid;
      grid-template-columns: 170px 1fr 120px;
      gap: 0;
      border-bottom: 1px solid var(--line2);
      min-height: 58px;
      align-items: center;
    }

    .doc-row:last-child {
      border-bottom: 0;
    }

    .doc-row > div {
      padding: 14px 16px;
      min-width: 0;
    }

    .doc-row .label {
      background: #fff9f2;
      height: 100%;
      font-weight: 800;
      color: var(--ink);
      border-right: 1px solid var(--line2);
    }

    .doc-row .value {
      color: var(--muted);
    }

    .notice-box {
      display: grid;
      gap: 12px;
    }

    .notice {
      border-radius: var(--radius);
      border: 1px solid var(--line);
      background: #fff;
      padding: 16px;
    }

    .notice strong {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 6px;
    }

    .notice p {
      margin: 0;
      color: var(--muted);
      font-size: 15px;
    }

    .news-layout {
      display: grid;
      grid-template-columns: minmax(0, 1fr) 330px;
      gap: 22px;
      align-items: start;
    }

    .news-list {
      background: #fff;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      overflow: hidden;
    }

    .news-item {
      display: grid;
      grid-template-columns: 120px 1fr auto;
      gap: 14px;
      align-items: center;
      min-height: 72px;
      padding: 14px 18px;
      border-bottom: 1px solid var(--line2);
      transition: background .2s ease;
    }

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

    .news-item:hover {
      background: #fff9f2;
    }

    .news-item time {
      color: var(--soft);
      font-size: 14px;
    }

    .news-item a {
      font-weight: 800;
      color: var(--ink);
    }

    .news-item a:hover {
      color: var(--brand);
      text-decoration: underline;
      text-decoration-color: var(--brand);
      text-underline-offset: 4px;
    }

    .recommend {
      border-radius: var(--radius);
      border: 1px solid rgba(229,57,31,.24);
      background: #fff;
      padding: 18px;
      box-shadow: var(--shadow);
    }

    .recommend h3 {
      margin: 8px 0 8px;
      font-size: 19px;
    }

    .recommend p {
      margin: 0 0 16px;
      color: var(--muted);
      font-size: 15px;
    }

    .form-panel {
      display: grid;
      grid-template-columns: .85fr 1.15fr;
      gap: 28px;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: var(--radius-lg);
      padding: 26px;
      box-shadow: var(--shadow);
    }

    .form-copy h2 {
      margin: 8px 0 10px;
      font-size: 27px;
      line-height: 1.28;
    }

    .form-copy p {
      margin: 0;
      color: var(--muted);
    }

    .form-list {
      display: grid;
      gap: 10px;
      margin-top: 18px;
    }

    .form-list li {
      list-style: none;
      display: flex;
      gap: 9px;
      color: var(--muted);
    }

    .form-list i {
      color: var(--green);
      width: 18px;
      height: 18px;
      margin-top: 4px;
      flex: 0 0 auto;
    }

    .feedback-form {
      display: grid;
      gap: 14px;
    }

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

    .field label {
      display: block;
      font-size: 13px;
      font-weight: 800;
      margin-bottom: 6px;
      color: var(--ink);
    }

    .field input,
    .field select,
    .field textarea {
      width: 100%;
      min-height: 46px;
      border-radius: var(--radius);
      border: 1px solid var(--line2);
      background: #fff;
      padding: 10px 12px;
      color: var(--ink);
      transition: border-color .2s ease, box-shadow .2s ease;
    }

    .field textarea {
      min-height: 106px;
      resize: vertical;
    }

    .field input:focus,
    .field select:focus,
    .field textarea:focus {
      border-color: var(--brand);
      box-shadow: 0 0 0 4px rgba(229,57,31,.12);
      outline: 0;
    }

    .screens-stage {
      border: 1px solid var(--line);
      border-radius: var(--radius-lg);
      background: #fff;
      box-shadow: var(--shadow);
      overflow: hidden;
    }

    .screen-toolbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 18px;
      border-bottom: 1px solid var(--line2);
      gap: 14px;
    }

    .screen-controls {
      display: flex;
      gap: 8px;
    }

    .icon-btn {
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      border-radius: var(--radius);
      background: #fff;
      border: 1px solid var(--line);
      color: var(--ink);
      transition: all .2s ease;
    }

    .icon-btn:hover {
      color: var(--brand);
      border-color: rgba(229,57,31,.32);
      background: #fff1e8;
    }

    .screen-track {
      display: grid;
      grid-auto-flow: column;
      grid-auto-columns: calc((100% - 32px) / 3);
      gap: 16px;
      overflow-x: auto;
      padding: 20px;
      scroll-snap-type: x mandatory;
      scrollbar-color: var(--brand) #f1f1f1;
    }

    .screen-card {
      scroll-snap-align: start;
      border: 1px solid var(--line2);
      border-radius: var(--radius);
      background: linear-gradient(180deg, #fff, #fff9f2);
      padding: 18px;
      min-height: 220px;
      position: relative;
    }

    .screen-card.active {
      border-color: var(--brand);
      box-shadow: 0 8px 22px rgba(229,57,31,.1);
    }

    .screen-num {
      width: 34px;
      height: 34px;
      display: grid;
      place-items: center;
      border-radius: 8px;
      background: var(--ink);
      color: #fff;
      font-weight: 900;
      margin-bottom: 18px;
    }

    .screen-card h3 {
      margin: 0 0 10px;
      font-size: 18px;
    }

    .screen-card ul {
      margin: 0;
      padding-left: 18px;
      color: var(--muted);
      font-size: 15px;
    }

    .screen-card li + li {
      margin-top: 5px;
    }

    .kpi-grid {
      display: grid;
      grid-template-columns: .9fr 1.1fr;
      gap: 22px;
      align-items: stretch;
    }

    .kpi-block {
      background: #fff;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: 20px;
      box-shadow: var(--shadow);
    }

    .kpi-number {
      font-size: 38px;
      font-weight: 900;
      line-height: 1;
      color: var(--brand);
      margin: 10px 0 8px;
    }

    .kpi-block p {
      margin: 0;
      color: var(--muted);
    }

    .chart {
      background: #fff;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: 20px;
    }

    .bar-row {
      display: grid;
      grid-template-columns: 120px 1fr 52px;
      gap: 12px;
      align-items: center;
      margin: 14px 0;
      color: var(--muted);
      font-size: 14px;
    }

    .bar {
      height: 12px;
      border-radius: 999px;
      background: #f1f2f4;
      overflow: hidden;
    }

    .bar span {
      display: block;
      height: 100%;
      border-radius: inherit;
      background: linear-gradient(90deg, var(--brand), var(--orange));
    }

    .reviews {
      display: grid;
      grid-template-columns: repeat(6, minmax(220px, 1fr));
      gap: 14px;
      overflow-x: auto;
      padding-bottom: 4px;
    }

    .review-card {
      min-width: 220px;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: 16px;
      box-shadow: 0 4px 14px rgba(32,33,36,.04);
    }

    .review-head {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 10px;
    }

    .avatar {
      width: 38px;
      height: 38px;
      border-radius: 999px;
      display: grid;
      place-items: center;
      background: var(--ink);
      color: #fff;
      font-weight: 900;
    }

    .stars {
      color: var(--orange);
      font-size: 13px;
      line-height: 1;
    }

    .review-card p {
      margin: 0 0 12px;
      color: var(--muted);
      font-size: 15px;
    }

    .download-cta {
      background: var(--ink);
      color: #fff;
      border-radius: var(--radius-lg);
      padding: 28px;
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 24px;
      align-items: center;
      position: relative;
      overflow: hidden;
    }

    .download-cta::before {
      content: "";
      position: absolute;
      left: 0;
      right: 0;
      top: 0;
      height: 5px;
      background: linear-gradient(90deg, var(--brand), var(--orange));
    }

    .download-cta h2 {
      color: #fff;
    }

    .download-cta p {
      margin: 10px 0 0;
      color: rgba(255,255,255,.72);
      max-width: 720px;
    }

    .cta-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: flex-end;
    }

    .cta-actions .btn-secondary,
    .cta-actions .btn-ghost {
      background: rgba(255,255,255,.08);
      color: #fff;
      border-color: rgba(255,255,255,.24);
    }

    .cta-actions .btn-secondary:hover,
    .cta-actions .btn-ghost:hover {
      background: rgba(255,255,255,.16);
      color: #fff;
    }

    .faq-wrap {
      display: grid;
      gap: 12px;
      max-width: 930px;
    }

    .faq-item {
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: #fff;
      overflow: hidden;
      transition: border-color .2s ease, box-shadow .2s ease;
    }

    .faq-item.open {
      border-color: rgba(229,57,31,.42);
      box-shadow: var(--shadow);
    }

    .faq-question {
      min-height: 56px;
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      background: transparent;
      color: var(--ink);
      padding: 15px 18px;
      text-align: left;
      font-weight: 900;
    }

    .faq-question span {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .faq-question b {
      color: var(--brand);
    }

    .faq-answer {
      display: none;
      padding: 0 18px 18px 48px;
      color: var(--muted);
      font-size: 15px;
    }

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

    .faq-item.open .faq-question i {
      transform: rotate(180deg);
    }

    .site-footer {
      background: var(--ink);
      color: rgba(255,255,255,.74);
      padding: 38px 0;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.15fr .85fr .85fr;
      gap: 26px;
      align-items: start;
    }

    .footer-brand {
      display: flex;
      align-items: center;
      gap: 12px;
      color: #fff;
      font-weight: 900;
      margin-bottom: 12px;
    }

    .footer-brand .brand-mark {
      width: 36px;
      height: 36px;
      color: #fff;
    }

    .footer-col h3 {
      margin: 0 0 12px;
      color: #fff;
      font-size: 16px;
    }

    .footer-col a {
      display: block;
      margin: 7px 0;
      color: rgba(255,255,255,.72);
      transition: color .2s ease;
    }

    .footer-col a:hover {
      color: #fff;
      text-decoration: underline;
      text-decoration-color: var(--orange);
      text-underline-offset: 4px;
    }

    .copyright {
      margin-top: 24px;
      padding-top: 18px;
      border-top: 1px solid rgba(255,255,255,.12);
      font-size: 13px;
      color: rgba(255,255,255,.58);
    }

    @media (max-width: 1100px) {
      :root {
        --side: 88px;
      }

      .hero-main,
      .benefit-layout,
      .requirements-grid,
      .form-panel,
      .kpi-grid,
      .download-cta,
      .news-layout {
        grid-template-columns: 1fr;
      }

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

      .screen-track {
        grid-auto-columns: calc((100% - 16px) / 2);
      }

      .cta-actions {
        justify-content: flex-start;
      }
    }

    @media (max-width: 767px) {
      .site-shell {
        display: block;
      }

      .side-nav {
        display: none;
      }

      .mobile-header {
        display: block;
      }

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

      .section {
        padding: 46px 0;
      }

      .hero {
        padding-top: 18px;
      }

      .hero-topline {
        align-items: flex-start;
        flex-direction: column;
        padding: 14px 16px;
      }

      .hero-main {
        padding: 20px;
        gap: 20px;
      }

      .hero h1 {
        font-size: 30px;
      }

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

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

      .btn {
        width: 100%;
        min-height: 48px;
      }

      .trust-tags {
        gap: 8px;
      }

      .assurance,
      .benefit-grid,
      .mini-grid,
      .form-grid,
      .footer-grid {
        grid-template-columns: 1fr;
      }

      .doc-row {
        grid-template-columns: 1fr;
      }

      .doc-row .label {
        border-right: 0;
        border-bottom: 1px solid var(--line2);
      }

      .news-item {
        grid-template-columns: 1fr;
        gap: 6px;
      }

      .screen-toolbar {
        align-items: flex-start;
        flex-direction: column;
      }

      .screen-track {
        grid-auto-columns: 86vw;
        padding: 16px;
      }

      .bar-row {
        grid-template-columns: 1fr;
        gap: 7px;
      }

      .reviews {
        grid-template-columns: none;
        grid-auto-flow: column;
        grid-auto-columns: 82vw;
      }

      .download-cta {
        padding: 24px 20px;
      }

      .faq-answer {
        padding-left: 18px;
      }
    }

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

      .section h2 {
        font-size: 24px;
      }

      .hero h1 {
        font-size: 28px;
      }

      .step {
        grid-template-columns: 34px 1fr;
      }

      .step .badge {
        grid-column: 2;
        width: fit-content;
      }
    }

/* roulang page: category1 */
:root {
      --ink: #202124;
      --ink-soft: #4b4f57;
      --muted: #747983;
      --line: #e6e1d8;
      --line-cool: #e5e7eb;
      --cream: #fff9f2;
      --paper: #ffffff;
      --section: #f5f6f8;
      --red: #e5391f;
      --red-dark: #c92d17;
      --orange: #ff8a00;
      --green: #168a4a;
      --amber: #b45309;
      --danger: #d93025;
      --radius-sm: 6px;
      --radius: 10px;
      --radius-lg: 16px;
      --shadow: 0 8px 24px rgba(32, 33, 36, .08);
      --shadow-strong: 0 16px 40px rgba(229, 57, 31, .14);
      --nav-width: 236px;
      --container: 1180px;
      --font: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      font-family: var(--font);
      color: var(--ink);
      background: var(--cream);
      line-height: 1.7;
      font-size: 16px;
      overflow-x: hidden;
    }
    a { color: inherit; text-decoration: none; transition: color .2s ease, background .2s ease, border-color .2s ease, transform .2s ease; }
    img, svg { max-width: 100%; display: block; }
    button, input, textarea, select { font: inherit; }
    button { cursor: pointer; border: 0; }
    :focus-visible { outline: 3px solid rgba(229, 57, 31, .25); outline-offset: 3px; }

    .container {
      width: min(var(--container), calc(100% - 64px));
      margin: 0 auto;
    }

    .mobile-header { position: relative; z-index: 50; }
    .mobile-bar { display: none; }
    .brand-mark {
      width: 38px;
      height: 38px;
      border-radius: 10px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: linear-gradient(135deg, var(--red), var(--orange));
      color: #fff;
      flex: 0 0 auto;
      box-shadow: 0 10px 20px rgba(229, 57, 31, .22);
    }
    .brand-mark svg { width: 21px; height: 21px; stroke-width: 1.8; }

    .side-nav {
      position: fixed;
      inset: 0 auto 0 0;
      width: var(--nav-width);
      min-height: 100vh;
      background: #202124;
      color: #fff;
      padding: 26px 18px;
      display: flex;
      flex-direction: column;
      border-right: 1px solid rgba(255,255,255,.08);
      z-index: 40;
    }
    .side-nav-logo {
      display: flex;
      flex-direction: column;
      gap: 6px;
      padding: 14px 14px 22px;
      border-bottom: 1px solid rgba(255,255,255,.12);
      margin-bottom: 22px;
    }
    .logo-main { font-size: 18px; line-height: 1.35; font-weight: 800; letter-spacing: .02em; }
    .logo-sub { font-size: 12px; color: rgba(255,255,255,.58); }
    .side-nav-links { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
    .side-nav-link {
      min-height: 48px;
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 12px 14px;
      border-radius: var(--radius);
      color: rgba(255,255,255,.78);
      font-size: 14px;
      position: relative;
    }
    .side-nav-link .nav-icon {
      width: 22px;
      height: 22px;
      border-radius: 8px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      color: var(--orange);
      background: rgba(255,138,0,.12);
      font-size: 20px;
      line-height: 1;
    }
    .side-nav-link:hover { background: rgba(255,255,255,.08); color: #fff; transform: translateX(2px); }
    .side-nav-link.active {
      background: rgba(229,57,31,.18);
      color: #fff;
      box-shadow: inset 4px 0 0 var(--red);
    }
    .side-nav-footer {
      margin-top: auto;
      color: rgba(255,255,255,.48);
      font-size: 12px;
      padding: 18px 14px 0;
      border-top: 1px solid rgba(255,255,255,.1);
    }
    .mobile-nav { display: none; }

    .page-shell { margin-left: var(--nav-width); min-height: 100vh; }
    main { background: linear-gradient(180deg, var(--cream) 0%, #fff 46%, var(--section) 100%); }
    section { padding: 64px 0; }
    .section-kicker {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 12px;
      border-radius: 999px;
      background: rgba(229,57,31,.08);
      color: var(--red);
      font-size: 13px;
      font-weight: 700;
      margin-bottom: 14px;
    }
    .section-title { font-size: 30px; line-height: 1.28; margin: 0 0 12px; letter-spacing: -.01em; }
    .section-desc { margin: 0; color: var(--ink-soft); max-width: 760px; }

    .btn {
      min-height: 46px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 9px;
      padding: 12px 18px;
      border-radius: 8px;
      font-weight: 800;
      font-size: 15px;
      border: 1px solid transparent;
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
      white-space: nowrap;
    }
    .btn svg { width: 18px; height: 18px; stroke-width: 1.9; }
    .btn-primary { background: var(--red); color: #fff; box-shadow: 0 12px 24px rgba(229,57,31,.22); }
    .btn-primary:hover { background: var(--red-dark); transform: translateY(-2px); box-shadow: var(--shadow-strong); }
    .btn-secondary { background: #fff; color: var(--ink); border-color: rgba(229,57,31,.38); }
    .btn-secondary:hover { background: #fff3e4; border-color: var(--red); transform: translateY(-2px); }
    .btn-muted { background: #f4f4f5; color: var(--ink-soft); border-color: var(--line-cool); }
    .btn-muted:hover { background: #fff; border-color: var(--orange); }
    .btn[disabled], .is-disabled { background: #e5e7eb !important; color: #9ca3af !important; cursor: not-allowed; box-shadow: none !important; transform: none !important; border-color: #e5e7eb !important; }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 5px 10px;
      border-radius: 999px;
      font-size: 12px;
      font-weight: 800;
      line-height: 1;
      border: 1px solid transparent;
    }
    .badge-red { background: rgba(229,57,31,.1); color: var(--red); border-color: rgba(229,57,31,.18); }
    .badge-orange { background: rgba(255,138,0,.13); color: #a55400; border-color: rgba(255,138,0,.24); }
    .badge-green { background: rgba(22,138,74,.1); color: var(--green); border-color: rgba(22,138,74,.2); }
    .badge-gray { background: #f3f4f6; color: #555b65; border-color: #e5e7eb; }
    .badge-warn { background: #fff7ed; color: var(--amber); border-color: #fed7aa; }

    .category-hero {
      padding: 54px 0 36px;
      border-bottom: 1px solid var(--line);
      background:
        radial-gradient(circle at 88% 12%, rgba(255,138,0,.18), transparent 28%),
        linear-gradient(135deg, #fff9f2 0%, #ffffff 68%);
    }
    .breadcrumb {
      display: flex;
      align-items: center;
      gap: 9px;
      color: var(--muted);
      font-size: 13px;
      margin-bottom: 22px;
      flex-wrap: wrap;
    }
    .breadcrumb a:hover { color: var(--red); text-decoration: underline; text-underline-offset: 4px; }
    .hero-layout {
      display: grid;
      grid-template-columns: minmax(0, 1.05fr) minmax(320px, .75fr);
      gap: 34px;
      align-items: stretch;
    }
    .hero-copy h1 {
      font-size: 40px;
      line-height: 1.18;
      margin: 0 0 18px;
      letter-spacing: -.02em;
    }
    .hero-copy p { color: var(--ink-soft); margin: 0 0 22px; max-width: 760px; }
    .hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin: 24px 0; }
    .trust-row { display: flex; flex-wrap: wrap; gap: 10px; }
    .whitepaper-card {
      background: #fff;
      border: 1px solid var(--line);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow);
      overflow: hidden;
      position: relative;
    }
    .cover-top {
      padding: 22px;
      background: linear-gradient(135deg, #202124 0%, #3a332f 62%, #5b2b21 100%);
      color: #fff;
    }
    .cover-label { color: #ffd0a2; font-size: 13px; font-weight: 800; margin-bottom: 12px; display: block; }
    .cover-title { font-size: 23px; font-weight: 900; line-height: 1.25; margin-bottom: 18px; }
    .cover-progress { height: 8px; background: rgba(255,255,255,.18); border-radius: 999px; overflow: hidden; }
    .cover-progress span { display: block; width: 76%; height: 100%; background: linear-gradient(90deg, var(--red), var(--orange)); }
    .cover-body { padding: 20px 22px 22px; }
    .toc-list { list-style: none; padding: 0; margin: 0 0 18px; display: grid; gap: 11px; }
    .toc-list li { display: flex; align-items: flex-start; gap: 10px; color: var(--ink-soft); font-size: 14px; }
    .toc-list i { width: 18px; height: 18px; color: var(--green); margin-top: 3px; flex: 0 0 auto; }
    .lead-form { display: grid; gap: 10px; }
    .input-field {
      width: 100%;
      height: 46px;
      border: 1px solid var(--line-cool);
      border-radius: 8px;
      padding: 0 13px;
      background: #fff;
      color: var(--ink);
      transition: border-color .2s ease, box-shadow .2s ease;
    }
    .input-field:focus { border-color: var(--red); box-shadow: 0 0 0 4px rgba(229,57,31,.1); outline: none; }
    .form-note { margin: 0; color: var(--muted); font-size: 12px; }

    .filter-section { padding-top: 44px; }
    .filter-panel {
      background: #fff;
      border: 1px solid var(--line);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow);
      padding: 20px;
      display: grid;
      gap: 16px;
    }
    .filter-title-row { display: flex; justify-content: space-between; gap: 14px; align-items: center; flex-wrap: wrap; }
    .filter-title-row h2 { margin: 0; font-size: 24px; }
    .filter-grid {
      display: grid;
      grid-template-columns: 1.2fr repeat(4, minmax(130px, .75fr));
      gap: 12px;
      align-items: end;
    }
    .filter-field label { display: block; color: var(--muted); font-size: 13px; font-weight: 800; margin-bottom: 7px; }
    .select-field, .search-field {
      width: 100%;
      height: 46px;
      border-radius: 8px;
      border: 1px solid var(--line-cool);
      background: #fff;
      padding: 0 12px;
      color: var(--ink);
      transition: border-color .2s ease, box-shadow .2s ease;
    }
    .select-field:focus, .search-field:focus { border-color: var(--red); box-shadow: 0 0 0 4px rgba(229,57,31,.1); outline: none; }

    .content-grid {
      display: grid;
      grid-template-columns: minmax(0, 1fr) 320px;
      gap: 24px;
      align-items: start;
      margin-top: 24px;
    }
    .entry-list { display: grid; gap: 16px; }
    .entry-card {
      background: #fff;
      border: 1px solid var(--line);
      border-radius: var(--radius-lg);
      padding: 20px;
      box-shadow: 0 4px 18px rgba(32,33,36,.05);
      transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease;
      position: relative;
      overflow: hidden;
    }
    .entry-card::before {
      content: "";
      position: absolute;
      inset: 0 auto 0 0;
      width: 4px;
      background: transparent;
      transition: background .2s ease;
    }
    .entry-card:hover { border-color: rgba(229,57,31,.55); box-shadow: var(--shadow); transform: translateY(-2px); }
    .entry-card:hover::before, .entry-card.featured::before { background: linear-gradient(180deg, var(--red), var(--orange)); }
     .entry-head { display: flex; justify-content: space-between; gap: 14px; align-items: flex-start; margin-bottom: 12px; }
    .entry-title { margin: 0; font-size: 21px; line-height: 1.35; letter-spacing: -.01em; }
    .entry-card:hover .entry-title { color: #151617; }
    .entry-summary { margin: 0 0 16px; color: var(--ink-soft); }
    .meta-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
    .entry-bottom { display: flex; justify-content: space-between; gap: 14px; align-items: center; flex-wrap: wrap; border-top: 1px solid #f0ede8; padding-top: 15px; }
    .entry-meta { display: flex; flex-wrap: wrap; gap: 12px; color: var(--muted); font-size: 13px; }
    .entry-meta span { display: inline-flex; align-items: center; gap: 5px; }
    .entry-meta i { width: 15px; height: 15px; }

    .side-panel { display: grid; gap: 16px; position: sticky; top: 22px; }
    .summary-card, .state-card, .notice-card {
      background: #fff;
      border: 1px solid var(--line);
      border-radius: var(--radius-lg);
      padding: 18px;
      box-shadow: 0 4px 18px rgba(32,33,36,.05);
    }
    .summary-card h3, .state-card h3, .notice-card h3 { margin: 0 0 12px; font-size: 18px; }
    .summary-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
    .summary-list li { display: flex; justify-content: space-between; gap: 12px; padding-bottom: 10px; border-bottom: 1px dashed var(--line); color: var(--ink-soft); font-size: 14px; }
    .summary-list li:last-child { border-bottom: 0; padding-bottom: 0; }
    .summary-list strong { color: var(--red); font-size: 18px; line-height: 1; }
    .state-item { display: flex; gap: 12px; align-items: flex-start; padding: 12px 0; border-bottom: 1px solid #f0ede8; }
    .state-item:last-child { border-bottom: 0; }
    .state-icon { width: 34px; height: 34px; border-radius: 9px; background: #fff3e4; color: var(--red); display: inline-flex; align-items: center; justify-content: center; flex: 0 0 auto; }
    .state-icon i { width: 18px; height: 18px; }
    .state-item b { display: block; line-height: 1.35; }
    .state-item span { color: var(--muted); font-size: 13px; }
    .notice-card { background: #fffaf2; }
    .notice-card p { margin: 0; color: var(--ink-soft); font-size: 14px; }

    .preview-section { background: #fff; }
    .screen-track {
      margin-top: 26px;
      display: grid;
      grid-template-columns: 1.08fr .92fr;
      gap: 22px;
      align-items: stretch;
    }
    .screen-large {
      border: 1px solid rgba(229,57,31,.42);
      border-radius: var(--radius-lg);
      background: linear-gradient(180deg, #fff 0%, #fff9f2 100%);
      box-shadow: var(--shadow);
      padding: 24px;
      min-height: 330px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .screen-window { border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: #fff; }
    .window-top { height: 42px; background: #202124; display: flex; align-items: center; gap: 7px; padding: 0 14px; }
    .dot { width: 9px; height: 9px; border-radius: 999px; background: #fff; opacity: .55; }
    .mock-body { padding: 18px; display: grid; gap: 12px; }
    .mock-line { height: 12px; border-radius: 999px; background: #ece7df; }
    .mock-line.red { background: linear-gradient(90deg, var(--red), var(--orange)); width: 58%; }
    .mock-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .mock-box { min-height: 68px; border: 1px solid var(--line); border-radius: 10px; background: #fff9f2; padding: 10px; }
    .mock-box span { display: block; height: 10px; background: #e9e2d7; border-radius: 999px; margin-bottom: 8px; }
    .mock-box b { display: block; height: 16px; width: 60%; background: rgba(229,57,31,.18); border-radius: 999px; }
    .screen-cards { display: grid; gap: 12px; }
    .screen-mini {
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: #fff;
      padding: 16px;
      transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
    }
    .screen-mini:hover { transform: translateY(-2px); border-color: var(--red); box-shadow: var(--shadow); }
    .screen-mini strong { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 8px; }
    .screen-mini p { margin: 0; color: var(--ink-soft); font-size: 14px; }

    .requirements-section { background: var(--section); }
    .require-layout { margin-top: 24px; display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 22px; }
    .require-table { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow); }
    .require-row { display: grid; grid-template-columns: 180px 1fr 140px; gap: 16px; padding: 17px 20px; border-bottom: 1px solid #f0ede8; align-items: center; }
    .require-row:last-child { border-bottom: 0; }
    .require-label { font-weight: 900; }
    .require-value { color: var(--ink-soft); }
    .compat-card { background: #202124; color: #fff; border-radius: var(--radius-lg); padding: 22px; box-shadow: var(--shadow); }
    .compat-card h3 { margin: 0 0 12px; font-size: 20px; }
    .compat-card p { color: rgba(255,255,255,.76); margin: 0 0 16px; }
    .compat-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
    .compat-list li { display: flex; gap: 9px; align-items: center; color: rgba(255,255,255,.86); font-size: 14px; }
    .compat-list i { color: #58d68d; width: 17px; height: 17px; }

    .status-section { background: #fff; }
    .status-grid { margin-top: 24px; display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 18px; }
    .status-card { border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 20px; background: #fff; box-shadow: 0 5px 18px rgba(32,33,36,.05); }
    .status-card.error { border-color: rgba(217,48,37,.28); background: #fff7f6; }
    .status-card.loading { background: linear-gradient(90deg, #fff, #fff8ee, #fff); background-size: 200% 100%; animation: shimmer 2.3s linear infinite; }
    @keyframes shimmer { 0% { background-position: 0 0; } 100% { background-position: -200% 0; } }
    .status-card h3 { margin: 0 0 8px; font-size: 18px; display: flex; gap: 9px; align-items: center; }
    .status-card h3 i { width: 20px; height: 20px; color: var(--red); }
    .status-card p { margin: 0; color: var(--ink-soft); font-size: 14px; }

    .reviews-section { background: var(--cream); }
    .review-wall { margin-top: 24px; columns: 3 260px; column-gap: 18px; }
    .review-card {
      break-inside: avoid;
      display: inline-block;
      width: 100%;
      margin: 0 0 18px;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: var(--radius-lg);
      padding: 18px;
      box-shadow: 0 4px 16px rgba(32,33,36,.05);
    }
    .review-user { display: flex; gap: 10px; align-items: center; margin-bottom: 10px; }
    .avatar { width: 38px; height: 38px; border-radius: 50%; background: linear-gradient(135deg, var(--red), var(--orange)); color: #fff; display: inline-flex; align-items: center; justify-content: center; font-weight: 900; }
    .stars { color: var(--orange); font-size: 13px; letter-spacing: 1px; }
    .review-card p { color: var(--ink-soft); margin: 10px 0 12px; font-size: 14px; }

    .download-section { background: #fff; }
    .download-box {
      border-radius: 20px;
      border: 1px solid rgba(229,57,31,.18);
      background: linear-gradient(135deg, #202124 0%, #312925 52%, #4b2119 100%);
      color: #fff;
      padding: 32px;
      box-shadow: 0 18px 48px rgba(32,33,36,.18);
      display: grid;
      grid-template-columns: minmax(0, 1fr) auto;
      gap: 28px;
      align-items: center;
    }
    .download-box h2 { margin: 0 0 10px; font-size: 29px; line-height: 1.3; }
    .download-box p { margin: 0; color: rgba(255,255,255,.78); }
    .promo-strip { display: inline-flex; align-items: center; gap: 8px; margin-bottom: 14px; padding: 6px 12px; border-radius: 999px; color: #fff; background: linear-gradient(90deg, var(--red), var(--orange)); font-weight: 900; font-size: 13px; }
    .download-actions { display: flex; flex-wrap: wrap; gap: 12px; justify-content: flex-end; }
    .download-actions .btn-secondary { background: rgba(255,255,255,.08); color: #fff; border-color: rgba(255,255,255,.32); }
    .download-actions .btn-secondary:hover { background: rgba(255,255,255,.16); }

    .faq-section { background: var(--section); }
    .faq-list { margin-top: 24px; display: grid; gap: 12px; }
    .faq-item { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: border-color .2s ease, box-shadow .2s ease; }
    .faq-item[open] { border-color: rgba(229,57,31,.45); box-shadow: var(--shadow); }
    .faq-item summary { min-height: 56px; list-style: none; display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 16px 18px; cursor: pointer; font-weight: 900; }
    .faq-item summary::-webkit-details-marker { display: none; }
    .faq-item summary i { width: 18px; height: 18px; color: var(--red); transition: transform .2s ease; flex: 0 0 auto; }
    .faq-item[open] summary i { transform: rotate(180deg); }
    .faq-answer { padding: 0 18px 18px 18px; color: var(--ink-soft); font-size: 15px; }

    .site-footer { background: #202124; color: #fff; padding: 54px 0 26px; }
    .footer-grid { display: grid; grid-template-columns: 1.2fr .8fr .8fr; gap: 34px; }
    .footer-brand { display: flex; align-items: center; gap: 12px; font-size: 18px; font-weight: 900; margin-bottom: 14px; }
    .footer-col p { margin: 0; color: rgba(255,255,255,.68); max-width: 460px; }
    .footer-col h3 { margin: 0 0 12px; font-size: 16px; }
    .footer-col a { display: block; color: rgba(255,255,255,.68); margin: 8px 0; font-size: 14px; }
    .footer-col a:hover { color: #fff; text-decoration: underline; text-decoration-color: var(--orange); text-underline-offset: 5px; }
    .copyright { margin-top: 32px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.12); color: rgba(255,255,255,.5); font-size: 13px; }

    @media (max-width: 1100px) {
      :root { --nav-width: 200px; }
      .container { width: min(var(--container), calc(100% - 42px)); }
      .hero-layout, .content-grid, .require-layout, .screen-track { grid-template-columns: 1fr; }
      .side-panel { position: static; grid-template-columns: repeat(3, 1fr); }
      .filter-grid { grid-template-columns: repeat(2, 1fr); }
      .status-grid { grid-template-columns: 1fr; }
      .download-box { grid-template-columns: 1fr; }
      .download-actions { justify-content: flex-start; }
    }

    @media (max-width: 767px) {
      body { padding-top: 110px; }
      .side-nav { display: none; }
      .page-shell { margin-left: 0; }
      .mobile-bar {
        position: fixed;
        inset: 0 0 auto 0;
        height: 58px;
        background: #202124;
        color: #fff;
        display: flex;
        align-items: center;
        padding: 0 16px;
        z-index: 60;
        box-shadow: 0 8px 20px rgba(32,33,36,.18);
      }
      .mobile-brand { display: flex; align-items: center; gap: 10px; font-weight: 900; min-width: 0; }
      .mobile-brand span:last-child { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
      .mobile-nav {
        position: fixed;
        inset: 58px 0 auto 0;
        height: 52px;
        background: #fff;
        border-bottom: 1px solid var(--line);
        display: flex;
        gap: 8px;
        overflow-x: auto;
        padding: 8px 14px;
        z-index: 59;
      }
      .mobile-link {
        min-height: 36px;
        flex: 0 0 auto;
        display: inline-flex;
        align-items: center;
        gap: 7px;
        padding: 8px 12px;
        border-radius: 999px;
        color: var(--ink-soft);
        font-size: 14px;
        border: 1px solid transparent;
      }
      .mobile-link svg { width: 16px; height: 16px; }
      .mobile-link.active { color: var(--red); background: rgba(229,57,31,.08); border-color: rgba(229,57,31,.22); font-weight: 900; }
      .container { width: min(100% - 32px, var(--container)); }
      section { padding: 46px 0; }
      .category-hero { padding-top: 34px; }
      .hero-copy h1 { font-size: 30px; }
      .section-title { font-size: 24px; }
      .filter-grid { grid-template-columns: 1fr; }
      .side-panel { grid-template-columns: 1fr; }
      .entry-head, .entry-bottom, .filter-title-row { align-items: flex-start; flex-direction: column; }
      .hero-actions .btn, .download-actions .btn { width: 100%; }
      .require-row { grid-template-columns: 1fr; gap: 6px; }
      .mock-grid { grid-template-columns: 1fr; }
      .review-wall { columns: 1; }
      .footer-grid { grid-template-columns: 1fr; }
      .download-box { padding: 24px; border-radius: 16px; }
    }

    @media (max-width: 520px) {
      .trust-row, .meta-row { gap: 7px; }
      .whitepaper-card, .entry-card, .filter-panel { border-radius: 12px; }
      .hero-copy h1 { font-size: 28px; }
      .screen-large { padding: 18px; }
      .btn { width: 100%; white-space: normal; }
    }