:root {
      --bg: #fbf7ef;
      --panel: #ffffff;
      --panel-soft: #fffaf1;
      --text: #23211d;
      --muted: #6f675c;
      --line: #eadfce;
      --accent: #b86b3f;
      --accent-dark: #7d4325;
      --green: #486b58;
      --shadow: 0 18px 50px rgba(91, 63, 34, 0.10);
      --radius-lg: 28px;
      --radius-md: 18px;
      --container: 1120px;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
      color: var(--text);
      background:
        radial-gradient(circle at 12% 6%, rgba(255, 217, 165, 0.55), transparent 28%),
        radial-gradient(circle at 86% 12%, rgba(188, 222, 203, 0.42), transparent 30%),
        linear-gradient(180deg, #fffaf1 0%, var(--bg) 38%, #f8efe1 100%);
      line-height: 1.75;
      overflow-x: hidden;
    }

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

    .container {
      width: min(100% - 32px, var(--container));
      margin: 0 auto;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(251, 247, 239, 0.86);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid rgba(234, 223, 206, 0.86);
    }

    .nav {
      min-height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      letter-spacing: -0.02em;
    }

    .brand-mark {
      width: 34px;
      height: 34px;
      border-radius: 12px;
      background: linear-gradient(135deg, #b86b3f, #e7b86f);
      box-shadow: 0 10px 24px rgba(184, 107, 63, 0.24);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 22px;
      color: var(--muted);
      font-size: 15px;
    }

    .nav-links a {
      transition: color 0.2s ease;
    }

    .nav-links a:hover {
      color: var(--accent-dark);
    }

    .menu-button {
      display: none;
      border: 1px solid var(--line);
      background: var(--panel);
      color: var(--text);
      border-radius: 999px;
      padding: 9px 14px;
      font-size: 14px;
    }

    main {
      padding: 34px 0 0;
    }

    .hero {
      padding: 54px 0 34px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.12fr) minmax(280px, 0.88fr);
      gap: 28px;
      align-items: stretch;
    }

    .hero-copy {
      padding: clamp(28px, 5vw, 56px);
      background: rgba(255, 255, 255, 0.76);
      border: 1px solid rgba(234, 223, 206, 0.92);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow);
      position: relative;
      overflow: hidden;
      animation: riseIn 0.7s ease both;
    }

    .hero-copy::after {
      content: "";
      position: absolute;
      right: -70px;
      bottom: -78px;
      width: 220px;
      height: 220px;
      border-radius: 50%;
      background: rgba(184, 107, 63, 0.10);
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 12px;
      border-radius: 999px;
      background: #f3eadb;
      color: var(--accent-dark);
      font-weight: 700;
      font-size: 13px;
      margin: 0 0 18px;
    }

    h1 {
      margin: 0;
      font-size: clamp(32px, 6vw, 58px);
      line-height: 1.12;
      letter-spacing: -0.05em;
      color: #201b16;
    }

    .lead {
      margin: 22px 0 0;
      max-width: 680px;
      color: var(--muted);
      font-size: clamp(16px, 2.2vw, 19px);
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 12px;
      margin-top: 28px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 46px;
      padding: 12px 18px;
      border-radius: 999px;
      border: 1px solid transparent;
      font-weight: 800;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    }

    .btn-primary {
      color: #fff;
      background: linear-gradient(135deg, var(--accent), var(--accent-dark));
      box-shadow: 0 12px 28px rgba(184, 107, 63, 0.22);
    }

    .btn-secondary {
      color: var(--accent-dark);
      background: #fff7eb;
      border-color: #ead7be;
    }

    .btn:hover {
      transform: translateY(-2px);
    }

    .diagnosis-card {
      padding: 30px;
      border-radius: var(--radius-lg);
      background: linear-gradient(180deg, #ffffff 0%, #fff8ed 100%);
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
      animation: riseIn 0.7s 0.12s ease both;
    }

    .screen-sketch {
      position: relative;
      min-height: 210px;
      border-radius: 26px;
      background:
        linear-gradient(135deg, rgba(72, 107, 88, 0.10), rgba(184, 107, 63, 0.10)),
        #fffdf8;
      border: 1px solid #eadfce;
      overflow: hidden;
      margin-bottom: 22px;
    }

    .screen-sketch::before,
    .screen-sketch::after {
      content: "";
      position: absolute;
      background: rgba(184, 107, 63, 0.42);
      transform-origin: left center;
      border-radius: 999px;
    }

    .screen-sketch::before {
      width: 150px;
      height: 3px;
      left: 48px;
      top: 74px;
      transform: rotate(22deg);
    }

    .screen-sketch::after {
      width: 190px;
      height: 3px;
      left: 105px;
      top: 126px;
      transform: rotate(-28deg);
    }

    .sketch-line {
      position: absolute;
      width: 92px;
      height: 3px;
      left: 154px;
      top: 90px;
      border-radius: 999px;
      background: rgba(72, 107, 88, 0.42);
      transform: rotate(56deg);
    }

    .quick-list {
      display: grid;
      gap: 12px;
      margin: 0;
      padding: 0;
      list-style: none;
    }

    .quick-list li {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      color: var(--muted);
    }

    .dot {
      width: 9px;
      height: 9px;
      flex: 0 0 9px;
      margin-top: 10px;
      border-radius: 50%;
      background: var(--green);
    }

    section {
      padding: 34px 0;
    }

    .section-head {
      max-width: 760px;
      margin-bottom: 22px;
    }

    h2 {
      margin: 0;
      font-size: clamp(25px, 4vw, 38px);
      line-height: 1.22;
      letter-spacing: -0.035em;
    }

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

    .answer-panel {
      display: grid;
      grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
      gap: 18px;
      align-items: stretch;
    }

    .soft-box {
      padding: 26px;
      border-radius: var(--radius-md);
      background: rgba(255, 255, 255, 0.78);
      border: 1px solid var(--line);
      box-shadow: 0 12px 34px rgba(91, 63, 34, 0.07);
    }

    .soft-box h3 {
      margin: 0 0 10px;
      font-size: 20px;
    }

    .soft-box p {
      margin: 0;
      color: var(--muted);
    }

    .check-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 14px;
    }

    .check-card {
      padding: 22px;
      border-radius: 22px;
      background: var(--panel);
      border: 1px solid var(--line);
      transition: transform 0.22s ease, box-shadow 0.22s ease;
    }

    .check-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 36px rgba(91, 63, 34, 0.10);
    }

    .check-card .num {
      display: inline-flex;
      width: 34px;
      height: 34px;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      background: #f3eadb;
      color: var(--accent-dark);
      font-weight: 900;
      margin-bottom: 12px;
    }

    .check-card h3 {
      margin: 0 0 8px;
      font-size: 18px;
    }

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

    .compare {
      overflow: hidden;
      border: 1px solid var(--line);
      border-radius: var(--radius-lg);
      background: var(--panel);
      box-shadow: var(--shadow);
    }

    .compare-row {
      display: grid;
      grid-template-columns: 0.9fr 1.1fr 1.1fr;
      border-top: 1px solid var(--line);
    }

    .compare-row:first-child {
      border-top: 0;
      background: #f4eadb;
      font-weight: 800;
      color: #312821;
    }

    .compare-cell {
      padding: 18px;
      border-left: 1px solid var(--line);
      color: var(--muted);
    }

    .compare-cell:first-child {
      border-left: 0;
      color: var(--text);
      font-weight: 800;
    }

    .process {
      display: grid;
      grid-template-columns: 0.8fr 1.2fr;
      gap: 18px;
      align-items: start;
    }

    .note {
      padding: 26px;
      border-radius: var(--radius-lg);
      background: #26362d;
      color: #fff8ed;
      position: sticky;
      top: 96px;
    }

    .note h2 {
      color: #fff8ed;
    }

    .note p {
      color: #e5d8c7;
      margin: 12px 0 0;
    }

    .steps {
      display: grid;
      gap: 12px;
    }

    .step {
      padding: 22px;
      border-radius: 22px;
      background: rgba(255, 255, 255, 0.82);
      border: 1px solid var(--line);
    }

    .step h3 {
      margin: 0 0 8px;
      font-size: 18px;
    }

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

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

    details {
      background: var(--panel);
      border: 1px solid var(--line);
      border-radius: 20px;
      padding: 18px 20px;
      box-shadow: 0 10px 26px rgba(91, 63, 34, 0.05);
    }

    summary {
      cursor: pointer;
      font-weight: 800;
      color: var(--text);
    }

    details p {
      margin: 12px 0 0;
      color: var(--muted);
    }

    .related-pages {
      padding: 34px 0 26px;
    }

    .related-box {
      padding: 26px;
      border-radius: var(--radius-lg);
      background: rgba(255, 255, 255, 0.76);
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
    }

    .related-box h2 {
      font-size: clamp(22px, 3vw, 30px);
      margin-bottom: 16px;
    }

    .related-list {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
      margin: 0;
      padding: 0;
      list-style: none;
    }

    .related-list a {
      display: block;
      min-height: 100%;
      padding: 16px 16px;
      border-radius: 16px;
      background: #fffaf1;
      border: 1px solid #eadfce;
      color: #3b332b;
      font-weight: 700;
      transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
    }

    .related-list a:hover {
      transform: translateY(-3px);
      border-color: #d8b58a;
      background: #fff4e2;
    }

    .site-footer {
      padding: 24px 0 34px;
      background: #f2e7d6;
      border-top: 1px solid #dfd0bc;
      color: #3b332b;
    }

    .footer-inner {
      display: flex;
      justify-content: space-between;
      gap: 18px;
      align-items: center;
      font-size: 14px;
      color: #5b5146;
    }

    .backtop {
      position: fixed;
      right: 18px;
      bottom: 18px;
      width: 44px;
      height: 44px;
      border: 1px solid #e0cbb0;
      border-radius: 50%;
      background: #fffaf1;
      color: var(--accent-dark);
      font-weight: 900;
      cursor: pointer;
      box-shadow: 0 10px 28px rgba(91, 63, 34, 0.12);
      opacity: 0;
      pointer-events: none;
      transform: translateY(10px);
      transition: opacity 0.2s ease, transform 0.2s ease;
    }

    .backtop.is-visible {
      opacity: 1;
      pointer-events: auto;
      transform: translateY(0);
    }

    @keyframes riseIn {
      from {
        opacity: 0;
        transform: translateY(18px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    @media (max-width: 900px) {
      .hero-grid,
      .answer-panel,
      .process {
        grid-template-columns: 1fr;
      }

      .check-grid,
      .related-list {
        grid-template-columns: 1fr 1fr;
      }

      .note {
        position: static;
      }

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

      .compare-cell {
        border-left: 0;
        border-top: 1px solid var(--line);
      }

      .compare-cell:first-child {
        border-top: 0;
        background: #fff7eb;
      }
    }

    @media (max-width: 720px) {
      .nav {
        min-height: 64px;
      }

      .menu-button {
        display: inline-flex;
      }

      .nav-links {
        position: absolute;
        left: 16px;
        right: 16px;
        top: 70px;
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 10px;
        border: 1px solid var(--line);
        border-radius: 18px;
        background: #fffdf8;
        box-shadow: var(--shadow);
      }

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

      .nav-links a {
        padding: 12px 10px;
        border-radius: 12px;
      }

      .nav-links a:hover {
        background: #fff4e2;
      }

      .hero {
        padding-top: 28px;
      }

      .hero-copy,
      .diagnosis-card,
      .soft-box,
      .related-box {
        border-radius: 22px;
      }

      .check-grid,
      .related-list {
        grid-template-columns: 1fr;
      }

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

      .btn {
        width: 100%;
      }

      .footer-inner {
        flex-direction: column;
        align-items: flex-start;
      }
    }

    @media (prefers-reduced-motion: reduce) {
      *,
      *::before,
      *::after {
        scroll-behavior: auto;
        animation: none !important;
        transition: none !important;
      }
    }