/* roulang page: index */
:root {
      --primary: #2f7df6;
      --primary-2: #4a90ff;
      --primary-soft: #eef5ff;
      --mint: #34c6b3;
      --orange: #ffb45c;
      --purple: #8e7cff;
      --bg: #f6f9ff;
      --bg-2: #eef5ff;
      --surface: #ffffff;
      --surface-soft: #fbfdff;
      --text: #172033;
      --muted: #5f6b7a;
      --weak: #8a96a8;
      --border: #e2eaf6;
      --border-strong: #d8e4f4;
      --shadow: 0 12px 35px rgba(31, 82, 160, .10);
      --shadow-hover: 0 18px 45px rgba(31, 82, 160, .16);
      --radius: 18px;
      --radius-lg: 28px;
      --radius-xl: 34px;
      --container: 1180px;
      --transition: .22s ease;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      color: var(--text);
      background:
        radial-gradient(circle at 12% 8%, rgba(74, 144, 255, .16), transparent 32%),
        radial-gradient(circle at 90% 12%, rgba(52, 198, 179, .12), transparent 28%),
        linear-gradient(180deg, #f8fbff 0%, var(--bg) 48%, #ffffff 100%);
      line-height: 1.78;
      overflow-x: hidden;
    }

    body::before {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
      opacity: .34;
      background-image:
        radial-gradient(rgba(47, 125, 246, .22) 1px, transparent 1px),
        linear-gradient(90deg, rgba(226, 234, 246, .35) 1px, transparent 1px);
      background-size: 24px 24px, 120px 120px;
      mask-image: linear-gradient(180deg, #000, transparent 75%);
      z-index: -2;
    }

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

    a:hover,
    a:focus {
      color: var(--primary);
      text-decoration: none;
    }

    img,
    svg {
      max-width: 100%;
      height: auto;
    }

    button,
    input,
    textarea {
      font: inherit;
    }

    input,
    textarea {
      width: 100%;
      border: 1px solid var(--border-strong);
      border-radius: 16px;
      background: #fff;
      color: var(--text);
      padding: 14px 16px;
      box-shadow: none;
      transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
    }

    input:focus,
    textarea:focus,
    button:focus,
    a:focus {
      outline: none;
      box-shadow: 0 0 0 4px rgba(47, 125, 246, .16);
    }

    textarea {
      min-height: 118px;
      resize: vertical;
    }

    .site-wrap {
      min-height: 100vh;
    }

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

    .section {
      padding: 82px 0;
      position: relative;
    }

    .section-tight {
      padding: 56px 0;
    }

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

    .section-kicker {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 12px;
      border-radius: 999px;
      background: rgba(47, 125, 246, .10);
      color: var(--primary);
      font-size: 13px;
      font-weight: 700;
      letter-spacing: .02em;
      margin-bottom: 14px;
    }

    .section-kicker::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--mint);
      box-shadow: 0 0 0 5px rgba(52, 198, 179, .14);
    }

    h1,
    h2,
    h3,
    h4,
    p {
      margin-top: 0;
    }

    h1 {
      font-size: clamp(34px, 6vw, 58px);
      line-height: 1.12;
      font-weight: 800;
      letter-spacing: -.045em;
      color: var(--text);
      margin-bottom: 20px;
    }

    h2 {
      font-size: clamp(28px, 4vw, 40px);
      line-height: 1.22;
      font-weight: 780;
      letter-spacing: -.025em;
      margin-bottom: 12px;
    }

    h3 {
      font-size: 22px;
      line-height: 1.38;
      font-weight: 720;
      margin-bottom: 10px;
    }

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

    .lead {
      font-size: 18px;
      line-height: 1.9;
      color: var(--muted);
    }

    .text-muted {
      color: var(--muted);
    }

    .text-weak {
      color: var(--weak);
    }

    .btn-row {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 12px;
    }

    .site-button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 9px;
      min-height: 46px;
      padding: 12px 20px;
      border-radius: 999px;
      border: 1px solid transparent;
      font-weight: 760;
      font-size: 15px;
      cursor: pointer;
      transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition), color var(--transition);
      user-select: none;
    }

    .site-button.primary {
      background: linear-gradient(135deg, var(--primary), var(--primary-2));
      color: #fff;
      box-shadow: 0 12px 24px rgba(47, 125, 246, .25);
    }

    .site-button.secondary {
      background: #fff;
      color: var(--primary);
      border-color: var(--border-strong);
      box-shadow: 0 8px 20px rgba(31, 82, 160, .08);
    }

    .site-button.ghost {
      background: rgba(255, 255, 255, .72);
      color: var(--text);
      border-color: var(--border);
    }

    .site-button:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-hover);
    }

    .site-button:active {
      transform: translateY(0) scale(.99);
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 10px;
      border-radius: 999px;
      background: var(--primary-soft);
      color: var(--primary);
      font-size: 13px;
      font-weight: 720;
      border: 1px solid rgba(47, 125, 246, .12);
    }

    .badge.mint {
      background: rgba(52, 198, 179, .12);
      color: #128f80;
      border-color: rgba(52, 198, 179, .18);
    }

    .badge.orange {
      background: rgba(255, 180, 92, .16);
      color: #b56714;
      border-color: rgba(255, 180, 92, .22);
    }

    .badge.purple {
      background: rgba(142, 124, 255, .14);
      color: #6254d6;
      border-color: rgba(142, 124, 255, .22);
    }

    .card {
      background: rgba(255, 255, 255, .92);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow);
      transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(47, 125, 246, .28);
    }

    .icon-box {
      width: 46px;
      height: 46px;
      border-radius: 16px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: linear-gradient(135deg, rgba(47, 125, 246, .12), rgba(52, 198, 179, .10));
      color: var(--primary);
      font-size: 18px;
      transition: transform var(--transition), background var(--transition), color var(--transition);
    }

    .card:hover .icon-box {
      transform: rotate(-4deg) scale(1.04);
      background: linear-gradient(135deg, rgba(47, 125, 246, .18), rgba(52, 198, 179, .16));
    }

    .site-header {
      padding: 20px 0 0;
      position: sticky;
      top: 0;
      z-index: 50;
      backdrop-filter: blur(14px);
    }

    .nav-panel {
      min-height: 76px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      padding: 13px 16px 13px 18px;
      border: 1px solid var(--border);
      border-radius: 26px;
      background: rgba(255, 255, 255, .88);
      box-shadow: 0 14px 35px rgba(31, 82, 160, .10);
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      min-width: 0;
      color: var(--text);
    }

    .brand-mark {
      width: 42px;
      height: 42px;
      border-radius: 16px;
      display: grid;
      place-items: center;
      color: #fff;
      background:
        radial-gradient(circle at 30% 30%, rgba(255, 255, 255, .5), transparent 28%),
        linear-gradient(135deg, var(--primary), var(--mint));
      box-shadow: 0 12px 22px rgba(47, 125, 246, .25);
      flex: 0 0 auto;
    }

    .brand-name {
      display: block;
      font-size: 18px;
      font-weight: 820;
      letter-spacing: -.02em;
      white-space: nowrap;
    }

    .brand-sub {
      display: block;
      margin-top: 1px;
      font-size: 12px;
      color: var(--weak);
      line-height: 1.2;
    }

    .nav-links {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      margin: 0;
      list-style: none;
    }

    .nav-link {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      min-height: 42px;
      padding: 9px 14px;
      border-radius: 16px;
      color: var(--muted);
      font-weight: 720;
      font-size: 14px;
      border: 1px solid transparent;
    }

    .nav-link:hover,
    .nav-link.active {
      background: var(--primary-soft);
      color: var(--primary);
      border-color: rgba(47, 125, 246, .12);
      box-shadow: 0 8px 18px rgba(31, 82, 160, .08);
    }

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

    .mobile-toggle {
      display: none;
      width: 44px;
      height: 44px;
      border-radius: 16px;
      border: 1px solid var(--border);
      background: #fff;
      color: var(--primary);
      align-items: center;
      justify-content: center;
      cursor: pointer;
    }

    .mobile-panel {
      display: none;
      margin-top: 10px;
      padding: 12px;
      border-radius: 22px;
      border: 1px solid var(--border);
      background: rgba(255, 255, 255, .95);
      box-shadow: var(--shadow);
    }

    .mobile-panel.is-open {
      display: block;
    }

    .mobile-panel .nav-link,
    .mobile-panel .site-button {
      width: 100%;
      justify-content: center;
      margin: 4px 0;
    }

    .hero {
      padding: 64px 0 72px;
    }

    .hero-stage {
      position: relative;
      overflow: hidden;
      border-radius: 36px;
      border: 1px solid var(--border);
      background:
        radial-gradient(circle at 10% 10%, rgba(47, 125, 246, .18), transparent 30%),
        radial-gradient(circle at 86% 16%, rgba(255, 180, 92, .16), transparent 25%),
        linear-gradient(135deg, rgba(255, 255, 255, .96), rgba(238, 245, 255, .92));
      box-shadow: 0 22px 58px rgba(31, 82, 160, .13);
      padding: clamp(28px, 5vw, 58px);
    }

    .hero-stage::after {
      content: "";
      position: absolute;
      right: -80px;
      bottom: -110px;
      width: 260px;
      height: 260px;
      border-radius: 48px;
      background: linear-gradient(135deg, rgba(47, 125, 246, .13), rgba(52, 198, 179, .10));
      transform: rotate(18deg);
      pointer-events: none;
    }

    .hero-top {
      max-width: 880px;
      margin: 0 auto 36px;
      text-align: center;
      position: relative;
      z-index: 1;
    }

    .hero-top .lead {
      max-width: 760px;
      margin: 0 auto 24px;
    }

    .hero-grid {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: 1.08fr .92fr;
      gap: 22px;
      align-items: stretch;
    }

    .progress-card {
      padding: 28px;
      min-height: 315px;
      display: grid;
      grid-template-columns: 210px 1fr;
      gap: 28px;
      align-items: center;
    }

    .progress-ring {
      width: 198px;
      height: 198px;
      border-radius: 50%;
      display: grid;
      place-items: center;
      position: relative;
      background:
        conic-gradient(var(--primary) 0 72%, rgba(47, 125, 246, .12) 72% 100%);
      box-shadow: inset 0 0 0 1px rgba(47, 125, 246, .08), 0 18px 32px rgba(47, 125, 246, .14);
    }

    .progress-ring::before {
      content: "";
      position: absolute;
      inset: 18px;
      border-radius: 50%;
      background: #fff;
      box-shadow: inset 0 0 0 1px var(--border);
    }

    .progress-inner {
      position: relative;
      text-align: center;
      z-index: 1;
    }

    .progress-number {
      display: block;
      font-size: 44px;
      line-height: 1;
      font-weight: 840;
      color: var(--primary);
      letter-spacing: -.04em;
    }

    .progress-label {
      display: block;
      margin-top: 8px;
      font-size: 13px;
      font-weight: 720;
      color: var(--weak);
    }

    .progress-copy h3 {
      font-size: 26px;
      margin-bottom: 12px;
    }

    .mini-stats {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      margin-top: 18px;
    }

    .mini-stat {
      padding: 13px 12px;
      border-radius: 18px;
      background: var(--surface-soft);
      border: 1px solid var(--border);
    }

    .mini-stat strong {
      display: block;
      color: var(--text);
      font-size: 19px;
      line-height: 1.1;
      font-weight: 820;
    }

    .mini-stat span {
      display: block;
      margin-top: 4px;
      font-size: 12px;
      color: var(--weak);
      font-weight: 650;
    }

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

    .tier-card {
      position: relative;
      padding: 18px;
      overflow: hidden;
      min-height: 95px;
    }

    .tier-card::after {
      content: "";
      position: absolute;
      width: 76px;
      height: 76px;
      border-radius: 24px;
      right: -22px;
      top: -18px;
      background: rgba(47, 125, 246, .08);
      transform: rotate(18deg);
    }

    .tier-card h3 {
      font-size: 18px;
      margin-bottom: 4px;
    }

    .tier-card p {
      margin-bottom: 10px;
      font-size: 14px;
      line-height: 1.62;
    }

    .entry-grid {
      display: grid;
      grid-template-columns: 1.25fr .75fr;
      gap: 20px;
    }

    .entry-main {
      padding: 30px;
      min-height: 280px;
      background:
        linear-gradient(135deg, rgba(255, 255, 255, .96), rgba(238, 245, 255, .78));
    }

    .entry-main .entry-links {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 12px;
      margin-top: 24px;
    }

    .entry-chip {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 14px;
      padding: 15px;
      border-radius: 18px;
      background: #fff;
      border: 1px solid var(--border);
      color: var(--text);
      font-weight: 720;
    }

    .entry-chip:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 24px rgba(31, 82, 160, .10);
      border-color: rgba(47, 125, 246, .28);
    }

    .entry-side {
      display: grid;
      gap: 16px;
    }

    .entry-small {
      padding: 22px;
      min-height: 132px;
    }

    .entry-small p,
    .entry-main p {
      margin-bottom: 0;
    }

    .milestone-wrap {
      position: relative;
      padding: 28px;
      border-radius: var(--radius-xl);
      background: linear-gradient(180deg, rgba(238, 245, 255, .78), rgba(255, 255, 255, .92));
      border: 1px solid var(--border);
      box-shadow: var(--shadow);
    }

    .milestone-line {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      position: relative;
    }

    .milestone-line::before {
      content: "";
      position: absolute;
      left: 8%;
      right: 8%;
      top: 30px;
      height: 4px;
      border-radius: 999px;
      background: linear-gradient(90deg, var(--primary), var(--mint), var(--orange));
      opacity: .28;
    }

    .milestone-item {
      position: relative;
      padding: 70px 18px 20px;
      border-radius: 22px;
      background: #fff;
      border: 1px solid var(--border);
      box-shadow: 0 10px 24px rgba(31, 82, 160, .07);
    }

    .milestone-dot {
      position: absolute;
      top: 14px;
      left: 18px;
      width: 38px;
      height: 38px;
      border-radius: 14px;
      display: grid;
      place-items: center;
      background: var(--primary);
      color: #fff;
      font-weight: 820;
      box-shadow: 0 10px 22px rgba(47, 125, 246, .25);
    }

    .milestone-item:nth-child(2) .milestone-dot {
      background: var(--mint);
    }

    .milestone-item:nth-child(3) .milestone-dot {
      background: var(--orange);
    }

    .milestone-item:nth-child(4) .milestone-dot {
      background: var(--purple);
    }

    .milestone-item h3 {
      font-size: 18px;
    }

    .milestone-item p {
      font-size: 14px;
      line-height: 1.7;
      margin-bottom: 0;
    }

    .news-layout {
      display: grid;
      grid-template-columns: .82fr 1.18fr;
      gap: 22px;
      align-items: start;
    }

    .news-note {
      padding: 28px;
      position: sticky;
      top: 112px;
    }

    .news-note-list {
      margin: 20px 0 0;
      padding: 0;
      list-style: none;
      display: grid;
      gap: 10px;
    }

    .news-note-list li {
      display: flex;
      gap: 10px;
      color: var(--muted);
      font-size: 15px;
    }

    .news-note-list i {
      color: var(--mint);
      margin-top: 5px;
    }

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

    .news-card {
      display: block;
      padding: 20px;
      border-radius: 24px;
      background: rgba(255, 255, 255, .94);
      border: 1px solid var(--border);
      box-shadow: 0 10px 28px rgba(31, 82, 160, .08);
      color: var(--text);
    }

    .news-card:hover {
      transform: translateY(-3px);
      border-color: rgba(47, 125, 246, .28);
      box-shadow: var(--shadow-hover);
    }

    .news-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      align-items: center;
      margin-bottom: 10px;
      color: var(--weak);
      font-size: 13px;
      font-weight: 650;
    }

    .news-title {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      margin-bottom: 8px;
      font-size: 19px;
      font-weight: 760;
      line-height: 1.42;
    }

    .news-title i {
      color: var(--primary);
      transition: transform var(--transition);
      flex: 0 0 auto;
    }

    .news-card:hover .news-title i {
      transform: translateX(4px);
    }

    .news-summary {
      margin: 0;
      color: var(--muted);
      font-size: 15px;
      line-height: 1.72;
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      overflow: hidden;
    }

    .empty-state {
      padding: 42px 26px;
      text-align: center;
      border-radius: 28px;
      background: linear-gradient(135deg, rgba(238, 245, 255, .86), rgba(255, 255, 255, .96));
      border: 1px dashed rgba(47, 125, 246, .26);
      box-shadow: var(--shadow);
    }

    .empty-visual {
      width: 78px;
      height: 78px;
      margin: 0 auto 16px;
      display: grid;
      place-items: center;
      border-radius: 28px;
      background: rgba(47, 125, 246, .10);
      color: var(--primary);
      font-size: 28px;
    }

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

    .assurance-card {
      padding: 24px;
      min-height: 210px;
    }

    .assurance-card.large {
      grid-column: span 5;
      background: linear-gradient(135deg, #fff, rgba(238, 245, 255, .82));
    }

    .assurance-card.mid {
      grid-column: span 4;
    }

    .assurance-card.small {
      grid-column: span 3;
    }

    .assurance-meter {
      margin-top: 20px;
      display: grid;
      gap: 12px;
    }

    .meter-row {
      display: grid;
      grid-template-columns: 90px 1fr 40px;
      gap: 10px;
      align-items: center;
      font-size: 13px;
      color: var(--muted);
      font-weight: 650;
    }

    .meter-track {
      height: 10px;
      border-radius: 999px;
      background: rgba(47, 125, 246, .10);
      overflow: hidden;
    }

    .meter-fill {
      height: 100%;
      border-radius: inherit;
      background: linear-gradient(90deg, var(--primary), var(--mint));
    }

    .app-stage {
      overflow: hidden;
      display: grid;
      grid-template-columns: 1fr .92fr;
      gap: 24px;
      align-items: center;
      padding: 34px;
      border-radius: var(--radius-xl);
      border: 1px solid var(--border);
      background:
        radial-gradient(circle at 86% 20%, rgba(142, 124, 255, .13), transparent 28%),
        linear-gradient(135deg, #fff, rgba(238, 245, 255, .86));
      box-shadow: var(--shadow);
    }

    .device-board {
      display: grid;
      gap: 14px;
    }

    .device-card {
      padding: 16px;
      border-radius: 22px;
      border: 1px solid var(--border);
      background: rgba(255, 255, 255, .9);
      display: flex;
      gap: 14px;
      align-items: center;
      box-shadow: 0 10px 22px rgba(31, 82, 160, .07);
    }

    .device-card strong {
      display: block;
      margin-bottom: 2px;
      color: var(--text);
    }

    .device-card span {
      display: block;
      color: var(--muted);
      font-size: 14px;
      line-height: 1.55;
    }

    .faq-shell {
      display: grid;
      grid-template-columns: .75fr 1.25fr;
      gap: 24px;
      align-items: start;
    }

    .accordion {
      background: transparent;
      margin: 0;
    }

    .accordion-item {
      margin-bottom: 12px;
      border: 1px solid var(--border);
      border-radius: 22px;
      overflow: hidden;
      background: #fff;
      box-shadow: 0 9px 24px rgba(31, 82, 160, .07);
      transition: border-color var(--transition), box-shadow var(--transition);
    }

    .accordion-item:hover {
      border-color: rgba(47, 125, 246, .25);
      box-shadow: var(--shadow);
    }

    .accordion-title {
      border: 0;
      color: var(--text);
      font-size: 17px;
      font-weight: 760;
      padding: 19px 52px 19px 20px;
      background: #fff;
      line-height: 1.45;
    }

    .accordion-title:hover,
    .accordion-title:focus {
      background: var(--primary-soft);
      color: var(--primary);
    }

    .accordion-title::before {
      right: 20px;
      margin-top: -10px;
      color: var(--primary);
      font-size: 22px;
    }

    .accordion-content {
      border: 0;
      background: #f8fbff;
      color: var(--muted);
      padding: 0 20px 20px;
      font-size: 15px;
      line-height: 1.82;
    }

    .contact-card {
      position: relative;
      overflow: hidden;
      border-radius: 36px;
      padding: clamp(24px, 5vw, 42px);
      border: 1px solid var(--border);
      background:
        radial-gradient(circle at 12% 18%, rgba(52, 198, 179, .13), transparent 28%),
        linear-gradient(135deg, rgba(238, 245, 255, .96), rgba(255, 255, 255, .95));
      box-shadow: var(--shadow);
    }

    .contact-card::after {
      content: "";
      position: absolute;
      right: -56px;
      top: -56px;
      width: 190px;
      height: 190px;
      border-radius: 46px;
      background: rgba(47, 125, 246, .08);
      transform: rotate(22deg);
    }

    .contact-layout {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: .9fr 1.1fr;
      gap: 24px;
      align-items: start;
    }

    .contact-form {
      padding: 22px;
      border-radius: 26px;
      background: rgba(255, 255, 255, .94);
      border: 1px solid var(--border);
      box-shadow: 0 10px 26px rgba(31, 82, 160, .08);
    }

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

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

    .form-hint {
      margin: 12px 0 0;
      color: var(--weak);
      font-size: 13px;
      line-height: 1.65;
    }

    .footer {
      padding: 30px 0 42px;
      background: linear-gradient(180deg, transparent, rgba(238, 245, 255, .88));
    }

    .footer-card {
      padding: 30px;
      border-radius: 30px;
      background: rgba(255, 255, 255, .92);
      border: 1px solid var(--border);
      box-shadow: var(--shadow);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.2fr .8fr .8fr;
      gap: 24px;
      align-items: start;
    }

    .footer-title {
      margin-bottom: 12px;
      font-size: 16px;
      font-weight: 780;
      color: var(--text);
    }

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

    .footer-links a {
      display: inline-flex;
      align-items: center;
      gap: 7px;
      color: var(--muted);
      font-size: 14px;
      font-weight: 650;
      padding: 5px 0;
    }

    .footer-links a:hover {
      color: var(--primary);
      transform: translateX(2px);
    }

    .copyright {
      margin-top: 22px;
      padding-top: 18px;
      border-top: 1px solid var(--border);
      display: flex;
      justify-content: space-between;
      gap: 16px;
      flex-wrap: wrap;
      color: var(--weak);
      font-size: 13px;
    }

    .article-typography {
      color: var(--text);
    }

    .article-typography h2 {
      margin-top: 1.6em;
    }

    .article-typography p {
      line-height: 1.85;
    }

    .article-typography blockquote {
      margin: 22px 0;
      padding: 16px 18px;
      border-left: 4px solid var(--primary);
      border-radius: 14px;
      background: var(--primary-soft);
      color: var(--muted);
    }

    @media screen and (max-width: 1024px) {
      .page-container {
        width: min(calc(100% - 32px), var(--container));
      }

      .hero-grid,
      .entry-grid,
      .news-layout,
      .app-stage,
      .faq-shell,
      .contact-layout {
        grid-template-columns: 1fr;
      }

      .progress-card {
        grid-template-columns: 180px 1fr;
      }

      .progress-ring {
        width: 170px;
        height: 170px;
      }

      .assurance-card.large,
      .assurance-card.mid,
      .assurance-card.small {
        grid-column: span 6;
      }

      .news-note {
        position: static;
      }

      .milestone-line {
        grid-template-columns: repeat(2, 1fr);
      }

      .milestone-line::before {
        display: none;
      }
    }

    @media screen and (max-width: 768px) {
      .site-header {
        padding-top: 12px;
      }

      .nav-panel {
        border-radius: 22px;
        padding: 10px;
      }

      .brand-name {
        font-size: 16px;
      }

      .brand-sub,
      .desktop-only,
      .nav-links,
      .nav-actions {
        display: none;
      }

      .mobile-toggle {
        display: inline-flex;
      }

      .hero {
        padding: 38px 0 54px;
      }

      .section {
        padding: 58px 0;
      }

      .section-head {
        display: block;
      }

      .hero-stage {
        border-radius: 28px;
        padding: 26px;
      }

      .hero-top {
        text-align: left;
        margin-bottom: 24px;
      }

      .progress-card {
        grid-template-columns: 1fr;
        text-align: left;
      }

      .progress-ring {
        width: 160px;
        height: 160px;
        margin: 0 auto;
      }

      .mini-stats,
      .entry-main .entry-links,
      .form-row {
        grid-template-columns: 1fr;
      }

      .assurance-card.large,
      .assurance-card.mid,
      .assurance-card.small {
        grid-column: span 12;
      }

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

      .copyright {
        display: block;
      }
    }

    @media screen and (max-width: 520px) {
      .page-container {
        width: min(calc(100% - 24px), var(--container));
      }

      h1 {
        font-size: 34px;
      }

      .lead {
        font-size: 16px;
      }

      .btn-row .site-button {
        width: 100%;
      }

      .hero-stage,
      .contact-card {
        padding: 22px;
      }

      .progress-card,
      .entry-main,
      .news-note,
      .assurance-card,
      .contact-form,
      .footer-card {
        padding: 20px;
      }

      .mini-stats {
        grid-template-columns: repeat(2, 1fr);
      }

      .milestone-line {
        grid-template-columns: 1fr;
      }

      .meter-row {
        grid-template-columns: 76px 1fr 34px;
      }
    }

/* roulang page: article */
:root {
      --primary: #2f7df6;
      --primary-2: #4a90ff;
      --primary-soft: #eef5ff;
      --mint: #34c6b3;
      --orange: #ffb45c;
      --purple: #8e7cff;
      --bg: #f6f9ff;
      --bg-2: #eef5ff;
      --surface: #ffffff;
      --surface-soft: #fbfdff;
      --text: #172033;
      --muted: #5f6b7a;
      --weak: #8a96a8;
      --border: #e2eaf6;
      --border-strong: #d8e4f4;
      --shadow: 0 12px 35px rgba(31, 82, 160, .10);
      --shadow-hover: 0 18px 45px rgba(31, 82, 160, .16);
      --radius: 18px;
      --radius-lg: 28px;
      --radius-xl: 34px;
      --container: 1180px;
      --transition: .22s ease;
    }

    * {
      box-sizing: border-box;
    }

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

    body {
      margin: 0;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      color: var(--text);
      background:
        radial-gradient(circle at 12% 8%, rgba(74, 144, 255, .16), transparent 32%),
        radial-gradient(circle at 90% 12%, rgba(52, 198, 179, .12), transparent 28%),
        linear-gradient(180deg, #f8fbff 0%, var(--bg) 48%, #ffffff 100%);
      line-height: 1.78;
      overflow-x: hidden;
    }

    body::before {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
      opacity: .34;
      background-image:
        radial-gradient(rgba(47, 125, 246, .22) 1px, transparent 1px),
        linear-gradient(90deg, rgba(226, 234, 246, .35) 1px, transparent 1px);
      background-size: 24px 24px, 120px 120px;
      mask-image: linear-gradient(180deg, #000, transparent 75%);
      z-index: -2;
    }

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

    a:hover,
    a:focus {
      color: var(--primary);
      text-decoration: none;
    }

    img,
    svg {
      max-width: 100%;
      height: auto;
      vertical-align: middle;
    }

    button,
    input,
    textarea {
      font: inherit;
    }

    button {
      border: 0;
      background: transparent;
      cursor: pointer;
    }

    input,
    textarea {
      width: 100%;
      border: 1px solid var(--border-strong);
      border-radius: 16px;
      background: #fff;
      color: var(--text);
      padding: 14px 16px;
      box-shadow: none;
      transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
    }

    input:focus,
    textarea:focus,
    button:focus,
    a:focus {
      outline: none;
      box-shadow: 0 0 0 4px rgba(47, 125, 246, .16);
    }

    textarea {
      min-height: 118px;
      resize: vertical;
    }

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

    .section {
      padding: 82px 0;
      position: relative;
    }

    .section-tight {
      padding: 56px 0;
    }

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

    .section-kicker {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 12px;
      border-radius: 999px;
      background: rgba(47, 125, 246, .10);
      color: var(--primary);
      font-size: 13px;
      font-weight: 700;
      letter-spacing: .02em;
      margin-bottom: 14px;
    }

    .section-kicker::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--mint);
      box-shadow: 0 0 0 5px rgba(52, 198, 179, .14);
    }

    .lead {
      font-size: 18px;
      line-height: 1.9;
      color: var(--muted);
    }

    .text-muted {
      color: var(--muted);
    }

    .text-weak {
      color: var(--weak);
    }

    .btn-row {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 12px;
    }

    .site-button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 9px;
      min-height: 46px;
      padding: 12px 20px;
      border-radius: 999px;
      border: 1px solid transparent;
      font-weight: 760;
      font-size: 15px;
      cursor: pointer;
      transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition), color var(--transition);
      user-select: none;
      white-space: nowrap;
    }

    .site-button.primary {
      background: linear-gradient(135deg, var(--primary), var(--primary-2));
      color: #fff;
      box-shadow: 0 12px 24px rgba(47, 125, 246, .25);
    }

    .site-button.secondary {
      background: #fff;
      color: var(--primary);
      border-color: var(--border-strong);
      box-shadow: 0 8px 20px rgba(31, 82, 160, .08);
    }

    .site-button.ghost {
      background: rgba(255, 255, 255, .72);
      color: var(--text);
      border-color: var(--border);
    }

    .site-button:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-hover);
    }

    .site-button:active {
      transform: translateY(0) scale(.99);
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 10px;
      border-radius: 999px;
      background: var(--primary-soft);
      color: var(--primary);
      font-size: 13px;
      font-weight: 720;
      border: 1px solid rgba(47, 125, 246, .12);
      line-height: 1.2;
    }

    .badge.mint {
      background: rgba(52, 198, 179, .12);
      color: #128f80;
      border-color: rgba(52, 198, 179, .18);
    }

    .badge.orange {
      background: rgba(255, 180, 92, .16);
      color: #b56714;
      border-color: rgba(255, 180, 92, .22);
    }

    .badge.purple {
      background: rgba(142, 124, 255, .14);
      color: #6254d6;
      border-color: rgba(142, 124, 255, .22);
    }

    .card {
      background: rgba(255, 255, 255, .92);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow);
      transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(47, 125, 246, .28);
    }

    .card:hover .icon-box {
      transform: rotate(-4deg) scale(1.04);
      background: linear-gradient(135deg, rgba(47, 125, 246, .18), rgba(52, 198, 179, .16));
    }

    .site-header {
      padding: 20px 0 0;
      position: sticky;
      top: 0;
      z-index: 50;
      background: linear-gradient(180deg, rgba(246, 249, 255, .94), rgba(246, 249, 255, .74) 74%, rgba(246, 249, 255, 0));
      backdrop-filter: blur(12px);
    }

    .nav-panel {
      min-height: 76px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      padding: 12px 14px 12px 18px;
      border-radius: 26px;
      background: rgba(255, 255, 255, .92);
      border: 1px solid var(--border);
      box-shadow: var(--shadow);
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      min-width: 0;
      color: var(--text);
    }

    .brand:hover {
      color: var(--text);
    }

    .brand-mark {
      width: 44px;
      height: 44px;
      flex: 0 0 44px;
      border-radius: 16px;
      display: grid;
      place-items: center;
      color: #fff;
      background:
        radial-gradient(circle at 35% 25%, rgba(255, 255, 255, .45), transparent 28%),
        linear-gradient(135deg, var(--primary), var(--mint));
      box-shadow: 0 12px 22px rgba(47, 125, 246, .22);
    }

    .brand-name {
      display: block;
      font-weight: 840;
      font-size: 18px;
      letter-spacing: -.02em;
      line-height: 1.15;
      color: var(--text);
    }

    .brand-sub {
      display: block;
      color: var(--weak);
      font-size: 12px;
      margin-top: 3px;
      line-height: 1.2;
    }

    .nav-links {
      list-style: none;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 0;
      margin: 0;
      flex: 1;
    }

    .nav-link {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      min-height: 42px;
      padding: 10px 14px;
      border-radius: 16px;
      color: var(--muted);
      font-size: 14px;
      font-weight: 730;
      border: 1px solid transparent;
    }

    .nav-link:hover {
      color: var(--primary);
      background: var(--primary-soft);
      border-color: rgba(47, 125, 246, .12);
      box-shadow: 0 10px 22px rgba(31, 82, 160, .08);
      transform: translateY(-1px);
    }

    .nav-link.active {
      color: var(--primary);
      background: linear-gradient(180deg, #fff, var(--primary-soft));
      border-color: rgba(47, 125, 246, .16);
      box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .72);
    }

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

    .mobile-toggle {
      display: none;
      width: 44px;
      height: 44px;
      align-items: center;
      justify-content: center;
      border-radius: 15px;
      color: var(--primary);
      background: var(--primary-soft);
      border: 1px solid rgba(47, 125, 246, .14);
    }

    .mobile-panel {
      display: none;
      margin: 10px 0 0;
      padding: 12px;
      border-radius: 22px;
      background: rgba(255, 255, 255, .96);
      border: 1px solid var(--border);
      box-shadow: var(--shadow);
    }

    .article-hero {
      padding: 54px 0 28px;
    }

    .breadcrumb-card {
      display: inline-flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 8px;
      max-width: 100%;
      padding: 10px 14px;
      border-radius: 999px;
      background: rgba(255, 255, 255, .88);
      border: 1px solid var(--border);
      box-shadow: 0 10px 26px rgba(31, 82, 160, .08);
      color: var(--muted);
      font-size: 14px;
      font-weight: 680;
      margin-bottom: 22px;
    }

    .breadcrumb-card i {
      color: var(--primary);
      font-size: 12px;
    }

    .breadcrumb-card .current {
      color: var(--weak);
      max-width: 360px;
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
    }

    .article-title-wrap {
      position: relative;
      overflow: hidden;
      border-radius: var(--radius-xl);
      border: 1px solid var(--border);
      background:
        radial-gradient(circle at 92% 18%, rgba(52, 198, 179, .16), transparent 30%),
        radial-gradient(circle at 8% 72%, rgba(142, 124, 255, .11), transparent 30%),
        linear-gradient(135deg, rgba(255, 255, 255, .96), rgba(238, 245, 255, .92));
      box-shadow: var(--shadow);
      padding: 42px;
    }

    .article-title-wrap::before,
    .article-title-wrap::after {
      content: "";
      position: absolute;
      border-radius: 999px;
      pointer-events: none;
    }

    .article-title-wrap::before {
      width: 140px;
      height: 140px;
      right: -34px;
      top: -42px;
      background: rgba(47, 125, 246, .10);
      border: 18px solid rgba(255, 255, 255, .6);
    }

    .article-title-wrap::after {
      width: 86px;
      height: 86px;
      right: 135px;
      bottom: -35px;
      background: rgba(255, 180, 92, .15);
      border: 14px solid rgba(255, 255, 255, .58);
    }

    .article-title-content {
      position: relative;
      z-index: 1;
      max-width: 880px;
    }

    .article-meta {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 10px;
      margin-bottom: 18px;
    }

    .article-title {
      margin: 0;
      max-width: 920px;
      font-size: clamp(32px, 5vw, 56px);
      line-height: 1.12;
      letter-spacing: -.04em;
      font-weight: 820;
      color: var(--text);
    }

    .article-summary {
      max-width: 860px;
      margin: 18px 0 0;
      font-size: 18px;
      line-height: 1.9;
      color: var(--muted);
    }

    .summary-strip {
      margin-top: 22px;
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 12px;
    }

    .summary-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 14px;
      border-radius: 20px;
      background: rgba(255, 255, 255, .78);
      border: 1px solid rgba(226, 234, 246, .9);
    }

    .summary-icon {
      width: 38px;
      height: 38px;
           flex: 0 0 38px;
      border-radius: 14px;
      display: grid;
      place-items: center;
      color: #fff;
      background: linear-gradient(135deg, var(--primary), var(--mint));
      box-shadow: 0 10px 20px rgba(47, 125, 246, .18);
    }

    .summary-text strong {
      display: block;
      font-size: 14px;
      line-height: 1.35;
      color: var(--text);
      font-weight: 780;
    }

    .summary-text span {
      display: block;
      margin-top: 2px;
      font-size: 12px;
      line-height: 1.45;
      color: var(--weak);
    }

    .article-main {
      padding: 38px 0 76px;
    }

    .article-layout {
      align-items: flex-start;
    }

    .article-shell {
      border-radius: var(--radius-xl);
      background: rgba(255, 255, 255, .94);
      border: 1px solid var(--border);
      box-shadow: var(--shadow);
      padding: 50px 54px;
      position: relative;
      overflow: hidden;
    }

    .article-shell::before {
      content: "";
      position: absolute;
      left: 0;
      top: 0;
      right: 0;
      height: 6px;
      background: linear-gradient(90deg, var(--primary), var(--mint), var(--orange));
    }

    .article-content {
      position: relative;
      z-index: 1;
      color: var(--text);
      font-size: 17px;
      line-height: 1.88;
      word-break: break-word;
    }

    .article-content > *:first-child {
      margin-top: 0;
    }

    .article-content h2 {
      margin: 2em 0 .75em;
      font-size: clamp(26px, 3vw, 34px);
      line-height: 1.28;
      font-weight: 800;
      letter-spacing: -.02em;
      color: var(--text);
    }

    .article-content h3 {
      margin: 1.65em 0 .65em;
      font-size: clamp(21px, 2.2vw, 25px);
      line-height: 1.35;
      font-weight: 760;
      color: var(--text);
    }

    .article-content h4 {
      margin: 1.35em 0 .55em;
      font-size: 19px;
      line-height: 1.4;
      font-weight: 740;
    }

    .article-content p {
      margin: 0 0 1.06em;
      color: #263248;
    }

    .article-content a {
      color: var(--primary);
      font-weight: 700;
      border-bottom: 1px solid rgba(47, 125, 246, .24);
    }

    .article-content a:hover {
      color: #1d63d3;
      border-bottom-color: rgba(47, 125, 246, .6);
    }

    .article-content ul,
    .article-content ol {
      margin: 1em 0 1.25em;
      padding-left: 1.45em;
    }

    .article-content li {
      margin: .42em 0;
      padding-left: .15em;
    }

    .article-content blockquote {
      margin: 1.45em 0;
      padding: 18px 22px;
      border-left: 5px solid var(--primary);
      border-radius: 0 18px 18px 0;
      background: linear-gradient(90deg, rgba(47, 125, 246, .09), rgba(238, 245, 255, .62));
      color: var(--muted);
      font-size: 16px;
    }

    .article-content blockquote p:last-child {
      margin-bottom: 0;
    }

    .article-content img {
      display: block;
      max-width: 100%;
      margin: 1.4em auto;
      border-radius: 18px;
      border: 1px solid var(--border);
      box-shadow: 0 16px 34px rgba(31, 82, 160, .10);
    }

    .article-content figure {
      margin: 1.6em 0;
    }

    .article-content figcaption {
      margin-top: 10px;
      text-align: center;
      color: var(--weak);
      font-size: 14px;
    }

    .article-content table {
      width: 100%;
      border-collapse: separate;
      border-spacing: 0;
      margin: 1.35em 0;
      overflow: hidden;
      border: 1px solid var(--border);
      border-radius: 16px;
      background: #fff;
      display: block;
      max-width: 100%;
      overflow-x: auto;
    }

    .article-content th,
    .article-content td {
      min-width: 132px;
      padding: 13px 14px;
      border-bottom: 1px solid var(--border);
      border-right: 1px solid var(--border);
      text-align: left;
      vertical-align: top;
    }

    .article-content th {
      background: var(--primary-soft);
      color: var(--text);
      font-weight: 760;
    }

    .article-content tr:last-child td {
      border-bottom: 0;
    }

    .article-content th:last-child,
    .article-content td:last-child {
      border-right: 0;
    }

    .article-content code {
      padding: 2px 6px;
      border-radius: 8px;
      background: var(--primary-soft);
      color: #1d63d3;
      font-size: .92em;
    }

    .article-content pre {
      overflow-x: auto;
      padding: 18px;
      border-radius: 18px;
      background: #12223b;
      color: #eaf2ff;
      line-height: 1.7;
      box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .06);
    }

    .article-content pre code {
      padding: 0;
      background: transparent;
      color: inherit;
    }

    .not-found-box {
      text-align: center;
      padding: 36px 20px;
    }

    .not-found-icon {
      width: 78px;
      height: 78px;
      margin: 0 auto 18px;
      border-radius: 24px;
      display: grid;
      place-items: center;
      color: var(--primary);
      font-size: 30px;
      background: var(--primary-soft);
      border: 1px solid rgba(47, 125, 246, .16);
    }

    .not-found-box h2 {
      margin: 0 0 12px;
      font-size: 30px;
      font-weight: 820;
      color: var(--text);
    }

    .not-found-box p {
      max-width: 560px;
      margin: 0 auto 24px;
      color: var(--muted);
      line-height: 1.85;
    }

    .article-side {
      position: sticky;
      top: 118px;
    }

    .side-card {
      padding: 22px;
      border-radius: 24px;
      background: rgba(255, 255, 255, .92);
      border: 1px solid var(--border);
      box-shadow: var(--shadow);
      margin-bottom: 18px;
    }

    .side-card h2,
    .side-card h3 {
      margin: 0 0 14px;
      font-size: 20px;
      line-height: 1.35;
      font-weight: 800;
      color: var(--text);
    }

    .side-card p {
      margin: 0 0 14px;
      color: var(--muted);
      font-size: 14px;
      line-height: 1.75;
    }

    .mini-list {
      list-style: none;
      padding: 0;
      margin: 0;
      display: grid;
      gap: 10px;
    }

    .mini-list a {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      padding: 12px;
      border-radius: 16px;
      background: var(--surface-soft);
      border: 1px solid var(--border);
      color: var(--text);
    }

    .mini-list a:hover {
      background: var(--primary-soft);
      border-color: rgba(47, 125, 246, .22);
      transform: translateY(-2px);
      box-shadow: 0 10px 24px rgba(31, 82, 160, .08);
    }

    .mini-dot {
      width: 10px;
      height: 10px;
      flex: 0 0 10px;
      margin-top: 8px;
      border-radius: 50%;
      background: var(--mint);
      box-shadow: 0 0 0 5px rgba(52, 198, 179, .12);
    }

    .mini-list strong {
      display: block;
      font-size: 14px;
      line-height: 1.5;
      font-weight: 760;
    }

    .mini-list span {
      display: block;
      margin-top: 3px;
      color: var(--weak);
      font-size: 12px;
      line-height: 1.55;
    }

    .progress-card {
      overflow: hidden;
    }

    .progress-track {
      height: 10px;
      border-radius: 999px;
      background: #eaf1fb;
      overflow: hidden;
      margin: 12px 0 8px;
    }

    .progress-fill {
      width: 76%;
      height: 100%;
      border-radius: inherit;
      background: linear-gradient(90deg, var(--primary), var(--mint));
    }

    .aside-actions {
      display: grid;
      gap: 10px;
      margin-top: 16px;
    }

    .article-faq {
      margin-top: 34px;
      padding: 0;
      background: transparent;
    }

    .accordion {
      margin: 0;
      background: transparent;
    }

    .accordion-item {
      margin-bottom: 12px;
      border-radius: 20px;
      overflow: hidden;
      border: 1px solid var(--border);
      background: #fff;
      box-shadow: 0 10px 24px rgba(31, 82, 160, .07);
    }

    .accordion-title {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      border: 0;
      padding: 18px 20px;
      color: var(--text);
      font-size: 16px;
      font-weight: 760;
      line-height: 1.55;
      background: #fff;
    }

    .accordion-title::before {
      display: none;
    }

    .accordion-title i {
      width: 28px;
      height: 28px;
      flex: 0 0 28px;
      border-radius: 50%;
      display: grid;
      place-items: center;
      color: var(--primary);
      background: var(--primary-soft);
      transition: transform var(--transition), background var(--transition);
    }

    .is-active > .accordion-title {
      color: var(--primary);
      background: linear-gradient(180deg, #fff, #f8fbff);
    }

    .is-active > .accordion-title i {
      transform: rotate(45deg);
      background: rgba(47, 125, 246, .14);
    }

    .accordion-title:hover,
    .accordion-title:focus {
      color: var(--primary);
      background: var(--primary-soft);
    }

    .accordion-content {
      border: 0;
      padding: 0 20px 20px;
      background: #fff;
      color: var(--muted);
      line-height: 1.85;
    }

    .article-cta {
      margin-top: 34px;
      border-radius: var(--radius-xl);
      border: 1px solid rgba(47, 125, 246, .16);
      background:
        radial-gradient(circle at 12% 22%, rgba(52, 198, 179, .16), transparent 30%),
        linear-gradient(135deg, #ffffff, #eef5ff);
      box-shadow: var(--shadow);
      padding: 30px;
      overflow: hidden;
      position: relative;
    }

    .article-cta::after {
      content: "";
      position: absolute;
      width: 120px;
      height: 120px;
      right: -38px;
      bottom: -42px;
      border-radius: 36px;
      background: rgba(47, 125, 246, .12);
      transform: rotate(16deg);
    }

    .article-cta-inner {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: minmax(0, 1.2fr) auto;
      align-items: center;
      gap: 20px;
    }

    .article-cta h2 {
      margin: 0 0 8px;
      font-size: clamp(24px, 3vw, 32px);
      font-weight: 820;
      line-height: 1.25;
      color: var(--text);
    }

    .article-cta p {
      margin: 0;
      color: var(--muted);
      line-height: 1.85;
    }

    .feedback-card {
      margin-top: 28px;
      padding: 26px;
      border-radius: 26px;
      background: rgba(255, 255, 255, .9);
      border: 1px solid var(--border);
      box-shadow: var(--shadow);
    }

    .feedback-card h2 {
      margin: 0 0 8px;
      font-size: 26px;
      font-weight: 820;
      color: var(--text);
    }

    .feedback-card p {
      margin: 0 0 18px;
      color: var(--muted);
    }

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

    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 14px;
    }

    .form-label {
      display: block;
      margin-bottom: 7px;
      color: var(--text);
      font-size: 14px;
      font-weight: 760;
    }

    .form-note {
      margin-top: 12px;
      color: var(--weak);
      font-size: 13px;
      line-height: 1.7;
    }

    .footer {
      padding: 30px 0 42px;
      background: linear-gradient(180deg, rgba(255, 255, 255, 0), rgba(238, 245, 255, .78));
    }

    .footer-card {
      border-radius: var(--radius-xl);
      background: rgba(255, 255, 255, .94);
      border: 1px solid var(--border);
      box-shadow: var(--shadow);
      padding: 34px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.45fr) minmax(180px, .7fr) minmax(180px, .7fr);
      gap: 28px;
      color: var(--muted);
    }

    .footer-title {
      margin-bottom: 12px;
      color: var(--text);
      font-size: 16px;
      font-weight: 820;
    }

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

    .footer-links a {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: var(--muted);
      font-size: 14px;
      font-weight: 650;
      padding: 6px 0;
    }

    .footer-links a i {
      color: var(--primary);
      font-size: 12px;
      transition: transform var(--transition);
    }

    .footer-links a:hover {
      color: var(--primary);
      transform: translateX(2px);
    }

    .footer-links a:hover i {
      transform: translateX(2px);
    }

    .copyright {
      margin-top: 26px;
      padding-top: 20px;
      border-top: 1px solid var(--border);
      display: flex;
      justify-content: space-between;
      gap: 16px;
      flex-wrap: wrap;
      color: var(--weak);
      font-size: 13px;
    }

    .desktop-only {
      display: inline-flex;
    }

    @media screen and (max-width: 1023px) {
      .desktop-only,
      .nav-links,
      .nav-actions {
        display: none;
      }

      .mobile-toggle {
        display: inline-flex;
      }

      .mobile-panel.is-open {
        display: grid;
        gap: 10px;
      }

      .article-side {
        position: static;
        margin-top: 22px;
      }

      .article-title-wrap {
        padding: 34px;
      }

      .article-shell {
        padding: 40px 36px;
      }

      .summary-strip {
        grid-template-columns: 1fr;
      }

      .article-cta-inner {
        grid-template-columns: 1fr;
      }

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

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

    @media screen and (max-width: 767px) {
      .page-container {
        width: min(calc(100% - 28px), var(--container));
      }

      .section {
        padding: 58px 0;
      }

      .site-header {
        padding-top: 12px;
      }

      .nav-panel {
        min-height: 68px;
        border-radius: 22px;
        padding: 10px 12px;
      }

      .brand-mark {
        width: 40px;
        height: 40px;
        flex-basis: 40px;
        border-radius: 14px;
      }

      .brand-name {
        font-size: 16px;
      }

      .brand-sub {
        font-size: 11px;
      }

      .article-hero {
        padding: 34px 0 18px;
      }

      .breadcrumb-card {
        border-radius: 18px;
        font-size: 13px;
      }

      .breadcrumb-card .current {
        max-width: 190px;
      }

      .article-title-wrap {
        border-radius: 26px;
        padding: 28px 22px;
      }

      .article-title {
        font-size: 34px;
        line-height: 1.16;
      }

      .article-summary {
        font-size: 16px;
      }

      .article-main {
        padding: 22px 0 58px;
      }

      .article-shell {
        border-radius: 26px;
        padding: 34px 24px;
      }

      .article-content {
        font-size: 16px;
        line-height: 1.86;
      }

      .article-content h2 {
        font-size: 25px;
      }

      .article-content h3 {
        font-size: 21px;
      }

      .summary-item {
        padding: 12px;
      }

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

      .article-cta {
        padding: 24px;
      }

      .footer-card {
        padding: 26px 22px;
      }

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

      .copyright {
        display: grid;
        gap: 8px;
      }

      .site-button {
        width: 100%;
      }

      .btn-row .site-button {
        width: auto;
      }
    }

    @media screen and (max-width: 520px) {
      .article-title {
        font-size: 31px;
      }

      .article-meta {
        gap: 8px;
      }

      .badge {
        font-size: 12px;
      }

      .article-shell {
        padding: 30px 20px;
      }

      .side-card,
      .feedback-card {
        padding: 20px;
      }

      .article-content table {
        font-size: 14px;
      }

      .btn-row {
        display: grid;
      }

      .btn-row .site-button {
        width: 100%;
      }
    }