:root {
      --zc-red: #e22426;
      --zc-blue: #2764d8;
      --zc-blue-dark: #1f55bd;
      --zc-green: #18a058;
      --zc-yellow: #f59e0b;
      --zc-purple: #8b5cf6;
      --zc-text-main: #111827;
      --zc-text-body: #344054;
      --zc-text-muted: #667085;
      --zc-border: #e6ebf2;
      --zc-bg-soft: #f7f9fc;
      --zc-bg-blue: #f2f7ff;
      --zc-shadow-sm: 0 8px 24px rgba(17, 24, 39, 0.06);
      --zc-shadow-md: 0 18px 48px rgba(17, 24, 39, 0.08);
      --zc-shadow-lg: 0 28px 72px rgba(17, 24, 39, 0.12);
    }


    html {
      scroll-behavior: smooth;
    }

    body {
      color: var(--zc-text-body);
      background: linear-gradient(180deg, #ffffff 0%, #ffffff 44%, #fbfcff 100%);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeLegibility;
    }

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

    .page {
      width: 100%;
      overflow: hidden;
    }

    .topbar {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.88);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid #edf0f5;
      box-shadow: 0 8px 26px rgba(17, 24, 39, 0.04);
    }

    .topbar-inner {
      max-width: 1200px;
      margin: 0 auto;
      padding: 14px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 800;
      font-size: 18px;
      color: var(--zc-text-main);
      letter-spacing: -0.2px;
    }

    .brand-mark {
      width: 36px;
      height: 36px;
      border-radius: 10px;
      background: linear-gradient(135deg, var(--zc-red), var(--zc-blue));
      color: #fff;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 15px;
      letter-spacing: -0.5px;
      box-shadow: 0 10px 22px rgba(226, 36, 38, 0.18);
    }

    .topnav {
      display: flex;
      align-items: center;
      gap: 26px;
      color: #4b5563;
      font-size: 14px;
      font-weight: 600;
    }

    .topnav a {
      position: relative;
    }

    .topnav a:hover {
      color: var(--zc-red);
    }

    .topnav a:not(.nav-cta)::after {
      content: "";
      position: absolute;
      left: 0;
      right: 0;
      bottom: -7px;
      height: 2px;
      border-radius: 999px;
      background: var(--zc-red);
      transform: scaleX(0);
      transform-origin: center;
      transition: transform 0.2s ease;
    }

    .topnav a:not(.nav-cta):hover::after {
      transform: scaleX(1);
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 40px;
      padding: 0 20px;
      border-radius: 999px;
      background: var(--zc-red);
      color: #fff !important;
      box-shadow: 0 10px 24px rgba(226, 36, 38, 0.22);
    }

    .hero {
      position: relative;
      min-height: 660px;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      background:
        radial-gradient(circle at 12% 18%, rgba(39, 100, 216, 0.16), transparent 30%),
        radial-gradient(circle at 88% 18%, rgba(226, 36, 38, 0.13), transparent 28%),
        radial-gradient(circle at 50% 100%, rgba(24, 160, 88, 0.1), transparent 32%),
        linear-gradient(135deg, #f8fbff 0%, #eef5ff 46%, #fff8f4 100%);
      padding: 108px 24px 96px;
    }

    .hero::after {
      content: "";
      position: absolute;
      left: 50%;
      bottom: 36px;
      width: min(760px, calc(100% - 48px));
      height: 1px;
      transform: translateX(-50%);
      background: linear-gradient(90deg, transparent, rgba(39, 100, 216, 0.28), transparent);
    }

    .hero-inner {
      width: 100%;
      max-width: 1040px;
      margin: 0 auto;
      position: relative;
      z-index: 1;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 9px;
      padding: 8px 18px;
      background: rgba(255, 255, 255, 0.88);
      border: 1px solid rgba(39, 100, 216, 0.18);
      border-radius: 999px;
      color: var(--zc-blue);
      font-size: 14px;
      font-weight: 800;
      margin-bottom: 28px;
      box-shadow: 0 12px 28px rgba(39, 100, 216, 0.08);
    }

    .eyebrow-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--zc-blue);
    }

    .hero h1 {
      max-width: 900px;
      margin: 0 auto 28px;
      font-size: clamp(38px, 6vw, 66px);
      line-height: 1.12;
      letter-spacing: -2px;
      color: var(--zc-text-main);
    }

    .hero h1 strong {
      color: var(--zc-red);
    }

    .hero-title-line {
      display: block;
    }

    .hero-desc {
      font-size: 18px;
      line-height: 1.9;
      color: #5f6b7a;
      max-width: 780px;
      margin: 0 auto 38px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
      justify-content: center;
      margin-bottom: 32px;
    }

    .btn-primary,
    .btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 52px;
      padding: 0 30px;
      border-radius: 999px;
      font-weight: 800;
      transition: all 0.2s ease;
    }

    .btn-primary {
      background: var(--zc-red);
      color: #ffffff;
      box-shadow: 0 16px 32px rgba(226, 36, 38, 0.24);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 18px 36px rgba(226, 36, 38, 0.3);
    }

    .btn-secondary {
      border: 1px solid #cfd8e3;
      background: #ffffff;
      color: var(--zc-text-main);
      box-shadow: 0 10px 24px rgba(17, 24, 39, 0.06);
    }

    .btn-secondary:hover {
      border-color: var(--zc-blue);
      color: var(--zc-blue);
      transform: translateY(-2px);
    }

    .hero-meta {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 12px;
    }

    .meta-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 10px 16px;
      background: rgba(255, 255, 255, 0.82);
      border: 1px solid rgba(207, 216, 227, 0.9);
      border-radius: 999px;
      color: #4b5563;
      font-size: 13px;
      font-weight: 700;
    }

    .section {
      padding: 96px 24px;
    }

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

    .container {
      max-width: 1180px;
      margin: 0 auto;
    }

    .section-title {
      text-align: center;
      margin-bottom: 54px;
    }

    .section-title.no-desc {
      margin-bottom: 40px;
    }

    .section-title .small-title {
      display: inline-block;
      color: var(--zc-red);
      font-size: 14px;
      font-weight: 800;
      letter-spacing: 1.4px;
      margin-bottom: 10px;
    }

    .section-title h2 {
      font-size: clamp(30px, 4vw, 42px);
      line-height: 1.25;
      color: var(--zc-text-main);
      letter-spacing: -0.8px;
      margin-bottom: 14px;
    }

    .section-title p {
      max-width: 780px;
      margin: 0 auto;
      color: var(--zc-text-muted);
      font-size: 17px;
      line-height: 1.9;
    }

    .prepare-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 20px;
    }

    .prepare-card {
      position: relative;
      background: #ffffff;
      border: 1px solid var(--zc-border);
      border-radius: 24px;
      padding: 32px 22px;
      min-height: 148px;
      box-shadow: var(--zc-shadow-sm);
      overflow: hidden;
      transition: all 0.22s ease;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .prepare-card:hover {
      transform: translateY(-6px);
      border-color: #cfe0ff;
      box-shadow: var(--zc-shadow-md);
    }

    .prepare-card::after {
      content: "";
      position: absolute;
      right: -28px;
      bottom: -28px;
      width: 90px;
      height: 90px;
      border-radius: 50%;
      background: #eef5ff;
      opacity: 0.75;
    }

    .prepare-icon {
      width: 50px;
      height: 50px;
      border-radius: 16px;
      background: linear-gradient(135deg, #eef5ff 0%, #e8f1ff 100%);
      color: var(--zc-blue);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      margin-bottom: 18px;
      position: relative;
      z-index: 1;
    }

    .prepare-card h3 {
      font-size: 18px;
      color: var(--zc-text-main);
      position: relative;
      z-index: 1;
    }

    .video-guide-card {
      margin-top: 28px;
      padding: 28px 32px;
      border-radius: 26px;
      background:
        radial-gradient(circle at 0% 0%, rgba(39, 100, 216, 0.08), transparent 34%),
        linear-gradient(135deg, #ffffff 0%, #f8fbff 100%);
      border: 1px solid #d7e5ff;
      box-shadow: var(--zc-shadow-md);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }

    .video-guide-content {
      display: flex;
      align-items: flex-start;
      gap: 16px;
    }

    .video-guide-icon {
      flex: 0 0 auto;
      width: 54px;
      height: 54px;
      border-radius: 18px;
      background: var(--zc-red);
      color: #ffffff;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      font-weight: 900;
      box-shadow: 0 10px 20px rgba(226, 36, 38, 0.18);
    }

    .video-guide-card h3 {
      color: var(--zc-text-main);
      font-size: 21px;
      margin-bottom: 4px;
    }

    .video-guide-card p {
      color: #667085;
      font-size: 15px;
      line-height: 1.75;
    }

    .video-guide-card a {
      flex: 0 0 auto;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 46px;
      padding: 0 22px;
      border-radius: 999px;
      background: var(--zc-blue);
      color: #ffffff;
      font-size: 14px;
      font-weight: 800;
      box-shadow: 0 10px 20px rgba(39, 100, 216, 0.18);
    }

    .video-guide-card a:hover {
      background: var(--zc-blue-dark);
    }

    .guide-layout {
      display: grid;
      grid-template-columns: 292px minmax(0, 1fr);
      gap: 38px;
      align-items: start;
    }

    .side-toc {
      position: sticky;
      top: 88px;
      background: #ffffff;
      border: 1px solid var(--zc-border);
      border-radius: 26px;
      padding: 24px;
      box-shadow: var(--zc-shadow-md);
      max-height: calc(100vh - 110px);
      overflow: auto;
      z-index: 5;
    }

    .side-toc h3 {
      font-size: 18px;
      color: var(--zc-text-main);
      margin-bottom: 18px;
    }

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

    .toc-list a {
      display: grid;
      grid-template-columns: 30px 1fr;
      gap: 10px;
      align-items: center;
      padding: 12px;
      border-radius: 15px;
      color: #4b5563;
      font-weight: 700;
      font-size: 14px;
      transition: all 0.2s ease;
      border: 1px solid transparent;
    }

    .toc-list a:hover,
    .toc-list a:focus,
    .toc-list a.active {
      color: var(--zc-blue);
      background: #eef5ff;
      border-color: #b9d2ff;
      outline: none;
    }

    .toc-list a.active .toc-num {
      background: var(--zc-blue);
      color: #ffffff;
    }

    .toc-num {
      width: 30px;
      height: 30px;
      border-radius: 11px;
      background: #f1f5f9;
      color: var(--zc-blue);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 12px;
      font-weight: 900;
    }

    .content-stack {
      display: grid;
      gap: 32px;
      max-height: calc(100vh - 116px);
      overflow-y: auto;
      overflow-x: hidden;
      padding-right: 12px;
      scroll-behavior: smooth;
      scroll-padding-top: 0;
    }

    .content-stack::after {
      content: "";
      height: 2px;
    }

    .content-stack::-webkit-scrollbar {
      width: 8px;
    }

    .content-stack::-webkit-scrollbar-track {
      background: #f1f5f9;
      border-radius: 999px;
    }

    .content-stack::-webkit-scrollbar-thumb {
      background: #cbd5e1;
      border-radius: 999px;
    }

    .content-stack::-webkit-scrollbar-thumb:hover {
      background: #94a3b8;
    }

    .guide-card {
      background: #ffffff;
      border: 1px solid var(--zc-border);
      border-radius: 28px;
      box-shadow: var(--zc-shadow-md);
      overflow: hidden;
    }

    .guide-header {
      display: grid;
      grid-template-columns: 94px 1fr;
      gap: 24px;
      align-items: center;
      padding: 34px 38px;
      background:
        radial-gradient(circle at 0% 0%, rgba(39, 100, 216, 0.07), transparent 28%),
        linear-gradient(135deg, #f9fbff 0%, #ffffff 68%);
      border-bottom: 1px solid #edf1f7;
    }

    .guide-badge {
      width: 78px;
      height: 78px;
      border-radius: 26px;
      background: var(--zc-blue);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-direction: column;
      line-height: 1.1;
      box-shadow: 0 14px 26px rgba(39, 100, 216, 0.22);
    }

    .guide-badge span:first-child {
      font-size: 13px;
      opacity: 0.85;
    }

    .guide-badge span:last-child {
      font-size: 25px;
      font-weight: 900;
    }

    .guide-card:nth-child(2) .guide-badge {
      background: var(--zc-green);
    }

    .guide-card:nth-child(3) .guide-badge {
      background: var(--zc-yellow);
    }

    .guide-card:nth-child(4) .guide-badge {
      background: var(--zc-purple);
    }

    .guide-card:nth-child(5) .guide-badge {
      background: var(--zc-red);
    }

    .guide-card:nth-child(6) .guide-badge {
      background: #0f766e;
    }

    .guide-card:nth-child(7) .guide-badge {
      background: #2563eb;
    }

    .guide-title h3 {
      font-size: 28px;
      color: var(--zc-text-main);
      margin-bottom: 8px;
      letter-spacing: -0.4px;
    }

    .entry {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      max-width: 100%;
      background: #f3f6fa;
      color: #526071;
      padding: 9px 14px;
      border-radius: 999px;
      font-size: 13px;
      font-weight: 700;
      line-height: 1.55;
    }

    .guide-body {
      padding: 36px 38px 40px;
    }

    .block-title {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      color: var(--zc-text-main);
      margin-bottom: 18px;
    }

    .block-title::before {
      content: "";
      width: 5px;
      height: 22px;
      border-radius: 999px;
      background: var(--zc-red);
    }

    .steps-list {
      counter-reset: step-counter;
      display: grid;
      gap: 14px;
    }

    .steps-list li {
      list-style: none;
      counter-increment: step-counter;
      display: grid;
      grid-template-columns: 34px 1fr;
      gap: 14px;
      color: #344054;
      line-height: 1.85;
    }

    .steps-list li::before {
      content: counter(step-counter);
      width: 34px;
      height: 34px;
      border-radius: 50%;
      background: #eef5ff;
      color: var(--zc-blue);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 13px;
      font-weight: 900;
      margin-top: 2px;
      box-shadow: 0 6px 14px rgba(39, 100, 216, 0.08);
    }

    .notice,
    .warning,
    .success {
      padding: 18px 22px;
      border-radius: 18px;
      margin-top: 22px;
      font-size: 14px;
      line-height: 1.8;
    }

    .notice {
      background: #fff8eb;
      border: 1px solid #fbdca4;
      color: #6b4b12;
    }

    .warning {
      background: #fff3f3;
      border: 1px solid #ffcaca;
      color: #8a1f1f;
    }

    .success {
      background: #ecfdf3;
      border: 1px solid #b7e8c8;
      color: #176c36;
    }

    .step-image {
      margin-top: 22px;
      border: 1px solid #dde5ef;
      border-radius: 22px;
      overflow: hidden;
      background: #ffffff;
      box-shadow: 0 16px 38px rgba(17, 24, 39, 0.08);
    }

    .step-image-caption {
      padding: 14px 18px;
      background: #f8fafc;
      border-top: 1px solid #e5eaf1;
      color: #667085;
      font-size: 13px;
      font-weight: 600;
      line-height: 1.7;
    }

    .image-placeholder {
      min-height: 280px;
      border: 2px dashed #b7c6dc;
      background:
        linear-gradient(135deg, rgba(39, 100, 216, 0.06), rgba(226, 36, 38, 0.04)),
        repeating-linear-gradient(
          -45deg,
          rgba(39, 100, 216, 0.035) 0,
          rgba(39, 100, 216, 0.035) 10px,
          transparent 10px,
          transparent 20px
        ),
        #fbfdff;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #5f6b7a;
      font-size: 22px;
      font-weight: 800;
      letter-spacing: 2px;
    }

    .table-wrap {
      overflow-x: auto;
      margin-top: 22px;
      border: 1px solid #e2e8f0;
      border-radius: 20px;
      box-shadow: 0 10px 24px rgba(17, 24, 39, 0.04);
    }

    table {
      width: 100%;
      border-collapse: collapse;
      background: #ffffff;
      min-width: 720px;
    }

    th,
    td {
      padding: 17px 20px;
      border-bottom: 1px solid #e5eaf1;
      text-align: left;
      vertical-align: top;
      line-height: 1.75;
    }

    th {
      background: #f5f8fc;
      color: #101828;
      font-weight: 800;
    }

    td {
      color: #475467;
    }

    tr:last-child td {
      border-bottom: none;
    }

    .check-section {
      padding-top: 100px;
      padding-bottom: 100px;
      background:
        radial-gradient(circle at 10% 18%, rgba(39, 100, 216, 0.2), transparent 26%),
        radial-gradient(circle at 88% 16%, rgba(226, 36, 38, 0.13), transparent 26%),
        linear-gradient(135deg, #0b1220 0%, #16294d 58%, #1f3763 100%);
      color: #ffffff;
    }

    .check-section .section-title h2,
    .check-section .section-title .small-title {
      color: #ffffff;
    }

    .check-section .section-title p {
      color: #d8e1ef;
    }

    .tips-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 22px;
    }

    .tip-card {
      background: rgba(255, 255, 255, 0.095);
      border: 1px solid rgba(255, 255, 255, 0.16);
      border-radius: 24px;
      padding: 28px;
      backdrop-filter: blur(8px);
      box-shadow: 0 16px 36px rgba(0, 0, 0, 0.12);
    }

    .tip-card h3 {
      color: #ffffff;
      font-size: 20px;
      margin-bottom: 16px;
    }

    .tip-card ul {
      padding-left: 18px;
    }

    .tip-card li {
      color: #d6deeb;
      margin-bottom: 8px;
      font-size: 14px;
      line-height: 1.75;
      list-style: disc;
    }

    .cta {
      text-align: center;
      padding: 96px 24px;
      background:
        radial-gradient(circle at 15% 20%, rgba(39, 100, 216, 0.08), transparent 28%),
        radial-gradient(circle at 88% 18%, rgba(226, 36, 38, 0.08), transparent 28%),
        linear-gradient(135deg, #f8fbff 0%, #fff7f5 100%);
    }

    .cta-box {
      max-width: 920px;
      margin: 0 auto;
      background: #ffffff;
      border: 1px solid #edf1f7;
      border-radius: 32px;
      padding: 54px 38px;
      box-shadow: var(--zc-shadow-lg);
    }

    .cta-box h2 {
      font-size: clamp(28px, 4vw, 38px);
      color: var(--zc-text-main);
      margin-bottom: 30px;
      letter-spacing: -0.7px;
    }

    .footer {
      background: #0b1220;
      color: #9ca3af;
      padding: 30px 24px;
      text-align: center;
      font-size: 14px;
    }

    @media (max-width: 1080px) {
      .hero {
        min-height: auto;
      }

      .section {
        padding: 76px 22px;
      }

      .guide-layout {
        grid-template-columns: 1fr;
        gap: 30px;
      }

      .side-toc {
        position: relative;
        top: auto;
        max-height: none;
        border-radius: 24px;
      }

      .content-stack {
        max-height: none;
        overflow: visible;
        padding-right: 0;
        gap: 28px;
      }

      .content-stack::after {
        display: none;
      }

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

      .video-guide-card {
        align-items: flex-start;
        flex-direction: column;
        gap: 18px;
      }
    }

    @media (max-width: 760px) {
      .topbar-inner {
        padding: 13px 18px;
      }

      .brand {
        font-size: 16px;
      }

      .brand-mark {
        width: 34px;
        height: 34px;
        border-radius: 10px;
      }

      .topnav {
        display: none;
      }

      .hero {
        padding: 72px 18px 64px;
      }

      .hero h1 {
        font-size: clamp(34px, 12vw, 46px);
        line-height: 1.15;
        letter-spacing: -1.2px;
      }

      .hero-desc {
        font-size: 16px;
        line-height: 1.85;
        margin-bottom: 30px;
      }

      .hero-actions {
        width: 100%;
        gap: 12px;
      }

      .btn-primary,
      .btn-secondary {
        width: 100%;
        min-height: 50px;
      }

      .hero-meta {
        gap: 10px;
      }

      .meta-pill {
        width: 100%;
        justify-content: center;
      }

      .section {
        padding: 62px 18px;
      }

      .section-title {
        margin-bottom: 34px;
      }

      .section-title h2 {
        line-height: 1.3;
      }

      .section-title p {
        font-size: 15px;
        line-height: 1.85;
      }

      .prepare-grid,
      .tips-grid {
        grid-template-columns: 1fr;
      }

      .prepare-card {
        min-height: 120px;
        border-radius: 20px;
      }

      .video-guide-card {
        padding: 22px;
        border-radius: 22px;
      }

      .video-guide-content {
        flex-direction: column;
      }

      .video-guide-icon {
        width: 50px;
        height: 50px;
      }

      .video-guide-card a {
        width: 100%;
      }

      .side-toc {
        padding: 20px;
        border-radius: 22px;
      }

      .toc-list a {
        grid-template-columns: 32px 1fr;
      }

      .guide-card {
        border-radius: 24px;
      }

      .guide-header {
        grid-template-columns: 1fr;
        padding: 26px 22px;
        gap: 18px;
      }

      .guide-badge {
        width: 70px;
        height: 70px;
        border-radius: 22px;
      }

      .guide-title h3 {
        font-size: 24px;
      }

      .entry {
        border-radius: 14px;
        align-items: flex-start;
      }

      .guide-body {
        padding: 28px 22px 30px;
      }

      .steps-list li {
        grid-template-columns: 32px 1fr;
        gap: 12px;
        line-height: 1.8;
      }

      .steps-list li::before {
        width: 32px;
        height: 32px;
      }

      .image-placeholder {
        min-height: 190px;
        font-size: 19px;
      }

      .step-image {
        border-radius: 20px;
      }

      .notice,
      .warning,
      .success {
        padding: 16px 18px;
        border-radius: 16px;
      }

      th,
      td {
        padding: 14px 16px;
      }

      .check-section {
        padding-top: 72px;
        padding-bottom: 72px;
      }

      .tip-card {
        padding: 24px;
        border-radius: 22px;
      }

      .cta {
        padding: 70px 18px;
      }

      .cta-box {
        padding: 40px 22px;
        border-radius: 26px;
      }

      .cta-box h2 {
        margin-bottom: 24px;
      }
    }