:root {
      --bg: #fbfaf6;
      --paper: #ffffff;
      --paper-soft: #fff7ea;
      --ink: #25221d;
      --muted: #686158;
      --line: #e8dfd1;
      --accent: #b86b2d;
      --accent-deep: #8b4d20;
      --green: #426b55;
      --shadow: 0 18px 48px rgba(92, 68, 39, 0.12);
      --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", "Microsoft YaHei", Arial, sans-serif;
      color: var(--ink);
      background:
        radial-gradient(circle at 12% 8%, rgba(255, 209, 140, 0.35), transparent 28rem),
        radial-gradient(circle at 88% 10%, rgba(184, 107, 45, 0.12), transparent 24rem),
        linear-gradient(180deg, #fffaf1 0%, var(--bg) 38%, #f7f2ea 100%);
      line-height: 1.75;
      overflow-x: hidden;
    }

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

    button {
      font: inherit;
    }

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

    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(251, 250, 246, 0.88);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid rgba(232, 223, 209, 0.78);
    }

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

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

    .brand-mark {
      width: 34px;
      height: 34px;
      border-radius: 12px;
      background: linear-gradient(135deg, #d68a43, #8f4b21);
      display: grid;
      place-items: center;
      color: #ffffff;
      font-size: 18px;
      box-shadow: 0 10px 24px rgba(184, 107, 45, 0.24);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 24px;
      color: #4b443c;
      font-size: 15px;
    }

    .nav-links a {
      position: relative;
      padding: 6px 0;
    }

    .nav-links a::after {
      content: "";
      position: absolute;
      left: 0;
      right: 0;
      bottom: 0;
      height: 2px;
      border-radius: 999px;
      background: var(--accent);
      transform: scaleX(0);
      transform-origin: right;
      transition: transform .22s ease;
    }

    .nav-links a:hover::after {
      transform: scaleX(1);
      transform-origin: left;
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 40px;
      padding: 0 16px;
      border-radius: 999px;
      background: #2f2a24;
      color: #ffffff;
      font-weight: 700;
      font-size: 14px;
      box-shadow: 0 10px 22px rgba(47, 42, 36, 0.16);
      transition: transform .2s ease, box-shadow .2s ease;
    }

    .nav-cta:hover {
      transform: translateY(-2px);
      box-shadow: 0 14px 30px rgba(47, 42, 36, 0.22);
    }

    .menu-toggle {
      display: none;
      width: 42px;
      height: 42px;
      border: 1px solid var(--line);
      border-radius: 14px;
      background: #ffffff;
      color: var(--ink);
      align-items: center;
      justify-content: center;
      cursor: pointer;
    }

    .menu-toggle span {
      width: 18px;
      height: 2px;
      background: currentColor;
      border-radius: 999px;
      position: relative;
    }

    .menu-toggle span::before,
    .menu-toggle span::after {
      content: "";
      position: absolute;
      left: 0;
      width: 18px;
      height: 2px;
      background: currentColor;
      border-radius: 999px;
    }

    .menu-toggle span::before {
      top: -6px;
    }

    .menu-toggle span::after {
      top: 6px;
    }

    main {
      padding-top: 34px;
    }

    .hero {
      padding: 42px 0 34px;
    }

    .hero-panel {
      display: grid;
      grid-template-columns: minmax(0, 1.16fr) minmax(280px, .84fr);
      gap: 28px;
      align-items: stretch;
      padding: clamp(24px, 5vw, 54px);
      border: 1px solid rgba(232, 223, 209, 0.9);
      border-radius: 36px;
      background:
        linear-gradient(135deg, rgba(255,255,255,0.96), rgba(255,248,235,0.88)),
        radial-gradient(circle at 85% 12%, rgba(184,107,45,.16), transparent 18rem);
      box-shadow: var(--shadow);
      position: relative;
      overflow: hidden;
    }

    .hero-panel::before {
      content: "";
      position: absolute;
      width: 190px;
      height: 190px;
      right: -64px;
      top: -62px;
      border-radius: 50%;
      border: 28px solid rgba(184, 107, 45, 0.08);
      animation: breathe 7s ease-in-out infinite;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      width: fit-content;
      padding: 7px 12px;
      border-radius: 999px;
      background: #fff0d9;
      color: #744016;
      font-size: 14px;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--accent);
      box-shadow: 0 0 0 5px rgba(184, 107, 45, 0.14);
    }

    h1 {
      margin: 0;
      max-width: 780px;
      font-size: clamp(34px, 6vw, 62px);
      line-height: 1.12;
      letter-spacing: -0.055em;
      color: #221f1a;
    }

    .hero-lead {
      margin: 22px 0 0;
      max-width: 760px;
      color: #554d44;
      font-size: clamp(16px, 2.4vw, 19px);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 48px;
      padding: 0 20px;
      border-radius: 999px;
      font-weight: 800;
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }

    .btn-primary {
      background: var(--accent);
      color: #ffffff;
      box-shadow: 0 14px 28px rgba(184, 107, 45, 0.24);
    }

    .btn-primary:hover {
      background: var(--accent-deep);
      transform: translateY(-2px);
      box-shadow: 0 18px 34px rgba(184, 107, 45, 0.3);
    }

    .btn-secondary {
      background: #ffffff;
      color: #2c2924;
      border: 1px solid var(--line);
    }

    .btn-secondary:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(92, 68, 39, 0.12);
    }

    .hero-card {
      position: relative;
      z-index: 1;
      border-radius: 28px;
      background: #2f2a24;
      color: #ffffff;
      padding: 26px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      gap: 22px;
      min-height: 320px;
      overflow: hidden;
    }

    .hero-card::after {
      content: "";
      position: absolute;
      width: 150px;
      height: 150px;
      right: -42px;
      bottom: -44px;
      border-radius: 44px;
      background: rgba(255, 214, 153, 0.14);
      transform: rotate(18deg);
    }

    .hero-card h2 {
      margin: 0;
      font-size: 22px;
      line-height: 1.35;
      color: #ffffff;
    }

    .hero-card p {
      margin: 10px 0 0;
      color: #e6d8c5;
    }

    .mini-list {
      display: grid;
      gap: 10px;
      position: relative;
      z-index: 1;
    }

    .mini-item {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      color: #f3eadf;
      font-size: 15px;
    }

    .mini-item span {
      flex: 0 0 auto;
      width: 22px;
      height: 22px;
      border-radius: 8px;
      background: rgba(255, 255, 255, 0.14);
      display: grid;
      place-items: center;
      color: #ffd89f;
      font-size: 13px;
      margin-top: 3px;
    }

    section {
      padding: 34px 0;
    }

    .section-head {
      display: grid;
      grid-template-columns: minmax(0, .9fr) minmax(260px, .55fr);
      gap: 24px;
      align-items: end;
      margin-bottom: 22px;
    }

    .section-kicker {
      color: var(--accent-deep);
      font-size: 14px;
      font-weight: 800;
      letter-spacing: 0.08em;
      margin: 0 0 8px;
    }

    h2 {
      margin: 0;
      font-size: clamp(26px, 4vw, 38px);
      line-height: 1.22;
      letter-spacing: -0.035em;
      color: #24211d;
    }

    .section-note {
      margin: 0;
      color: var(--muted);
      font-size: 16px;
    }

    .decision-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
    }

    .decision-card {
      background: rgba(255,255,255,0.86);
      border: 1px solid var(--line);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: 0 12px 32px rgba(92, 68, 39, 0.07);
      transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
    }

    .decision-card:hover {
      transform: translateY(-5px);
      border-color: rgba(184, 107, 45, 0.32);
      box-shadow: 0 18px 42px rgba(92, 68, 39, 0.13);
    }

    .icon-badge {
      width: 42px;
      height: 42px;
      border-radius: 16px;
      background: #fff0d9;
      color: var(--accent-deep);
      display: grid;
      place-items: center;
      font-weight: 900;
      margin-bottom: 16px;
    }

    h3 {
      margin: 0;
      font-size: 20px;
      line-height: 1.35;
      color: #292520;
    }

    .decision-card p,
    .compare-card p,
    .local-card p,
    .faq-answer {
      color: var(--muted);
      margin: 10px 0 0;
    }

    .rule-strip {
      margin-top: 16px;
      border-radius: 24px;
      background: linear-gradient(135deg, #fff4df, #ffffff);
      border: 1px solid var(--line);
      padding: 22px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
      align-items: center;
    }

    .rule-strip strong {
      color: #2f2a24;
    }

    .compare-wrap {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
    }

    .compare-card {
      border-radius: 30px;
      padding: 26px;
      background: var(--paper);
      border: 1px solid var(--line);
      box-shadow: 0 14px 34px rgba(92, 68, 39, 0.08);
    }

    .compare-card.repair {
      background: linear-gradient(180deg, #ffffff, #fff7ea);
    }

    .compare-card.replace {
      background: linear-gradient(180deg, #ffffff, #f1f6f2);
    }

    .check-list {
      list-style: none;
      padding: 0;
      margin: 18px 0 0;
      display: grid;
      gap: 12px;
    }

    .check-list li {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      color: #4c463f;
    }

    .check-list li::before {
      content: "";
      width: 10px;
      height: 10px;
      margin-top: 10px;
      border-radius: 50%;
      background: var(--accent);
      flex: 0 0 auto;
    }

    .replace .check-list li::before {
      background: var(--green);
    }

    .local-panel {
      display: grid;
      grid-template-columns: minmax(0, .74fr) minmax(280px, .46fr);
      gap: 18px;
      align-items: start;
    }

    .local-card {
      background: rgba(255,255,255,0.88);
      border: 1px solid var(--line);
      border-radius: var(--radius-lg);
      padding: 26px;
      box-shadow: 0 14px 34px rgba(92, 68, 39, 0.08);
    }

    .local-points {
      display: grid;
      gap: 12px;
      margin-top: 18px;
    }

    .local-point {
      display: grid;
      grid-template-columns: 32px 1fr;
      gap: 12px;
      align-items: start;
      padding: 14px;
      border-radius: 18px;
      background: #fff9ef;
      border: 1px solid #f0e3d0;
    }

    .local-point b {
      width: 32px;
      height: 32px;
      border-radius: 12px;
      display: grid;
      place-items: center;
      background: #2f2a24;
      color: #ffffff;
      font-size: 14px;
    }

    .local-point p {
      margin: 0;
      color: #5d554c;
    }

    .side-note {
      background: #efe7dc;
      border: 1px solid #ddd1c3;
      border-radius: 28px;
      padding: 24px;
      color: #403a34;
      position: sticky;
      top: 96px;
    }

    .side-note h3 {
      font-size: 19px;
    }

    .side-note ul {
      padding-left: 20px;
      margin: 14px 0 0;
      color: #5c544a;
    }

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

    .step {
      counter-increment: step;
      padding: 22px;
      border-radius: 26px;
      background: var(--paper);
      border: 1px solid var(--line);
      position: relative;
      overflow: hidden;
    }

    .step::before {
      content: counter(step);
      display: grid;
      place-items: center;
      width: 38px;
      height: 38px;
      border-radius: 14px;
      background: #2f2a24;
      color: #ffffff;
      font-weight: 900;
      margin-bottom: 16px;
    }

    .step p {
      margin: 8px 0 0;
      color: var(--muted);
      font-size: 15px;
    }

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

    .faq-item {
      border: 1px solid var(--line);
      border-radius: 22px;
      background: rgba(255,255,255,0.88);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      border: 0;
      background: transparent;
      color: #27231f;
      padding: 18px 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      text-align: left;
      cursor: pointer;
      font-weight: 800;
      font-size: 17px;
    }

    .faq-question .plus {
      width: 28px;
      height: 28px;
      border-radius: 10px;
      background: #fff0d9;
      color: var(--accent-deep);
      display: grid;
      place-items: center;
      flex: 0 0 auto;
      transition: transform .22s ease;
    }

    .faq-answer {
      display: none;
      padding: 0 20px 20px;
    }

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

    .faq-item.active .plus {
      transform: rotate(45deg);
    }

    .closing {
      padding-bottom: 40px;
    }

    .closing-panel {
      border-radius: 32px;
      padding: clamp(24px, 5vw, 42px);
      background:
        linear-gradient(135deg, #2f2a24, #4c3422);
      color: #ffffff;
      display: grid;
      grid-template-columns: minmax(0, .92fr) minmax(260px, .48fr);
      gap: 24px;
      align-items: center;
      overflow: hidden;
      position: relative;
    }

    .closing-panel::after {
      content: "";
      position: absolute;
      right: -70px;
      top: -80px;
      width: 220px;
      height: 220px;
      border-radius: 50%;
      background: rgba(255, 220, 170, 0.13);
    }

    .closing-panel h2 {
      color: #ffffff;
    }

    .closing-panel p {
      margin: 12px 0 0;
      color: #eadbc8;
    }

    .closing-box {
      position: relative;
      z-index: 1;
      border-radius: 24px;
      background: rgba(255,255,255,0.1);
      border: 1px solid rgba(255,255,255,0.18);
      padding: 22px;
    }

    .closing-box strong {
      display: block;
      color: #ffffff;
      font-size: 18px;
      margin-bottom: 8px;
    }

    .site-footer {
      background: #f0e8dc;
      color: #2f2a24;
      border-top: 1px solid #ded2c3;
      padding: 26px 0;
    }

    .footer-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      color: #51493f;
      font-size: 14px;
    }

    .footer-links {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }

    .footer-links a {
      color: #3b352f;
    }

    .footer-links a:hover {
      color: var(--accent-deep);
    }

    .reveal {
      opacity: 0;
      transform: translateY(18px);
      transition: opacity .55s ease, transform .55s ease;
    }

    .reveal.visible {
      opacity: 1;
      transform: translateY(0);
    }

    @keyframes breathe {
      0%, 100% {
        transform: scale(1);
        opacity: .7;
      }
      50% {
        transform: scale(1.08);
        opacity: 1;
      }
    }

    @media (max-width: 920px) {
      .nav-links,
      .nav-cta {
        display: none;
      }

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

      .nav.open {
        align-items: flex-start;
        padding: 15px 0;
        flex-wrap: wrap;
      }

      .nav.open .nav-links {
        order: 3;
        width: 100%;
        display: grid;
        gap: 4px;
        padding: 10px 0 4px;
      }

      .nav.open .nav-links a {
        padding: 10px 0;
      }

      .hero-panel,
      .section-head,
      .local-panel,
      .closing-panel {
        grid-template-columns: 1fr;
      }

      .hero-card {
        min-height: auto;
      }

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

      .side-note {
        position: static;
      }
    }

    @media (max-width: 640px) {
      .container {
        width: min(100% - 24px, var(--container));
      }

      main {
        padding-top: 18px;
      }

      .hero {
        padding-top: 22px;
      }

      .hero-panel {
        border-radius: 26px;
        padding: 22px;
      }

      .hero-actions {
        flex-direction: column;
      }

      .btn {
        width: 100%;
      }

      section {
        padding: 26px 0;
      }

      .decision-grid,
      .compare-wrap,
      .steps,
      .rule-strip {
        grid-template-columns: 1fr;
      }

      .decision-card,
      .compare-card,
      .local-card,
      .step {
        padding: 20px;
        border-radius: 22px;
      }

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

    @media (prefers-reduced-motion: reduce) {
      html {
        scroll-behavior: auto;
      }

      *,
      *::before,
      *::after {
        animation: none !important;
        transition: none !important;
      }

      .reveal {
        opacity: 1;
        transform: none;
      }
    }