/* roulang page: index */
:root {
      --deep-ink: #141414;
      --champagne-gold: #C8A96E;
      --champagne-light: #D4B87A;
      --ivory-white: #F5F0E8;
      --warm-gray: #D6D0C8;
      --muted-gray: #B7AFA6;
      --soft-white: rgba(245, 240, 232, 0.9);
      --border-gold: rgba(200, 169, 110, 0.25);
      --border-light: rgba(200, 169, 110, 0.15);
      --shadow-gold: 8px 8px 0px rgba(200, 169, 110, 0.15);
      --shadow-hover: 12px 12px 0px rgba(200, 169, 110, 0.22);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-pill: 40px;
      --font-serif: 'Noto Serif SC', 'Playfair Display', 'Times New Roman', serif;
      --font-sans: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-mono: 'Space Mono', 'JetBrains Mono', monospace;
      --transition-default: 0.25s ease-out;
      --transition-smooth: 0.3s ease;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--deep-ink);
      color: var(--warm-gray);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeLegibility;
    }

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

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

    button, input, textarea {
      font-family: inherit;
    }

    .container {
      max-width: 1440px;
      margin: 0 auto;
      padding: 0 2rem;
    }

    /* 胶囊导航 */
    .capsule-nav {
      position: fixed;
      top: 24px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 90vw;
      background: rgba(20, 20, 20, 0.75);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: var(--radius-pill);
      padding: 0.5rem 2rem;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 2rem;
      z-index: 1000;
      border: 1px solid rgba(200, 169, 110, 0.2);
      transition: background 0.3s ease, border-color 0.3s ease;
    }

    .capsule-nav.scrolled {
      background: rgba(20, 20, 20, 0.9);
      border-color: rgba(200, 169, 110, 0.35);
    }

    .nav-logo {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.25rem;
      color: var(--champagne-gold);
      letter-spacing: 0.02em;
      white-space: nowrap;
      margin-right: 1rem;
    }

    .nav-links {
      display: flex;
      gap: 1.8rem;
      align-items: center;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--ivory-white);
      transition: color 0.2s;
      position: relative;
      padding-bottom: 2px;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--champagne-gold);
    }

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--champagne-gold);
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(20, 20, 20, 0.9);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-top: 1px solid rgba(200, 169, 110, 0.25);
      justify-content: space-around;
      padding: 0.6rem 0.5rem;
      z-index: 1000;
    }

    .mobile-bottom-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 0.7rem;
      color: var(--warm-gray);
      gap: 4px;
      font-weight: 500;
    }

    .mobile-bottom-nav a.active {
      color: var(--champagne-gold);
    }

    /* Hero */
    #hero {
      display: grid;
      grid-template-columns: 5fr 7fr;
      min-height: 100vh;
      align-items: center;
      background: radial-gradient(circle at 30% 10%, rgba(200,169,110,0.08) 0%, transparent 60%), var(--deep-ink);
      padding: 6rem 2rem 4rem;
      gap: 3rem;
    }

    .hero-left {
      display: flex;
      flex-direction: column;
      justify-content: center;
      gap: 1.8rem;
    }

    .hero-left h1 {
      font-family: var(--font-serif);
      font-size: clamp(3rem, 5vw, 4.5rem);
      font-weight: 700;
      color: var(--ivory-white);
      line-height: 1.15;
      letter-spacing: -0.02em;
    }

    .hero-sub {
      font-size: 1.25rem;
      color: var(--muted-gray);
      max-width: 420px;
      line-height: 1.6;
    }

    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--champagne-gold);
      color: var(--deep-ink);
      padding: 0.85rem 2.2rem;
      border-radius: 6px;
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: background 0.25s ease-out, transform 0.2s;
      font-size: 1rem;
      letter-spacing: 0.02em;
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      background: var(--champagne-light);
      transform: scale(1.03);
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--champagne-gold);
      color: var(--ivory-white);
      padding: 0.85rem 2.2rem;
      border-radius: 6px;
      font-weight: 500;
      cursor: pointer;
      transition: background 0.25s ease-out, transform 0.2s;
    }

    .btn-secondary:hover {
      background: rgba(200, 169, 110, 0.1);
      transform: scale(1.03);
    }

    .hero-right {
      position: relative;
      display: flex;
      justify-content: flex-end;
    }

    .hero-img-wrapper {
      position: relative;
      border-radius: 4px;
      overflow: hidden;
      clip-path: polygon(4% 0%, 100% 0%, 96% 100%, 0% 100%);
    }

    .hero-img-wrapper img {
      width: 100%;
      height: auto;
      object-fit: cover;
      filter: sepia(0.1) brightness(0.9);
      transition: filter 0.4s;
    }

    .hero-img-wrapper:hover img {
      filter: sepia(0) brightness(1);
    }

    .golden-frame {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      border: 1px solid rgba(200,169,110,0.5);
      pointer-events: none;
    }

    /* 板块通用 */
    section {
      padding: 5rem 2rem;
      scroll-margin-top: 100px;
    }

    .section-title {
      font-family: var(--font-serif);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--ivory-white);
      margin-bottom: 1rem;
    }

    .section-desc {
      color: var(--muted-gray);
      max-width: 600px;
      margin-bottom: 2.5rem;
      font-size: 1.1rem;
    }

    /* 亮点网格 2x3 错落 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
      margin-top: 1rem;
    }

    .highlight-card {
      background: rgba(255,255,255,0.03);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 2.5rem 2rem;
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      gap: 1.2rem;
      backdrop-filter: blur(4px);
    }

    .highlight-card:hover {
      border-color: var(--champagne-gold);
      box-shadow: var(--shadow-gold);
      transform: translateY(-4px);
    }

    .highlight-icon {
      font-size: 2.5rem;
      color: var(--champagne-gold);
    }

    .highlight-card h3 {
      font-family: var(--font-serif);
      font-weight: 600;
      font-size: 1.5rem;
      color: var(--ivory-white);
    }

    .highlight-card p {
      color: var(--muted-gray);
      font-size: 0.95rem;
    }

    /* 案例瀑布 */
    .cases-masonry {
      columns: 3;
      column-gap: 1.8rem;
    }

    .case-card {
      break-inside: avoid;
      margin-bottom: 1.8rem;
      background: rgba(255,255,255,0.02);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: all 0.3s;
    }

    .case-card:hover {
      border-color: var(--champagne-gold);
      box-shadow: var(--shadow-gold);
    }

    .case-img {
      width: 100%;
      height: auto;
      filter: sepia(0.1) brightness(0.9);
      transition: 0.3s;
    }

    .case-card:hover .case-img {
      filter: sepia(0) brightness(1);
    }

    .case-text {
      padding: 1.5rem;
    }

    .case-text h4 {
      font-family: var(--font-serif);
      font-weight: 600;
      color: var(--ivory-white);
      margin-bottom: 0.5rem;
    }

    .case-tag {
      font-family: var(--font-mono);
      font-size: 0.75rem;
      text-transform: uppercase;
      letter-spacing: 0.1em;
      color: var(--champagne-gold);
      margin-bottom: 0.5rem;
    }

    /* 方案对比 */
    .compare-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0;
      border: 1px solid var(--border-gold);
      border-radius: var(--radius-md);
      overflow: hidden;
      background: rgba(20,20,20,0.6);
    }

    .compare-col {
      padding: 3rem;
    }

    .compare-col.standard {
      background: transparent;
    }

    .compare-col.premium {
      background: rgba(245,240,232,0.03);
      border-left: 1px solid var(--champagne-gold);
    }

    .compare-col h3 {
      font-family: var(--font-serif);
      font-size: 1.8rem;
      margin-bottom: 2rem;
      color: var(--ivory-white);
    }

    .compare-list {
      list-style: none;
    }

    .compare-list li {
      display: flex;
      align-items: center;
      gap: 1rem;
      margin-bottom: 1.2rem;
      font-size: 1rem;
    }

    .icon-check {
      color: var(--champagne-gold);
    }

    .icon-cross {
      color: #6b6b6b;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px dashed rgba(200,169,110,0.3);
      padding: 1.5rem 0;
      cursor: pointer;
    }

    .faq-question {
      font-family: var(--font-serif);
      font-weight: 600;
      font-size: 1.3rem;
      color: var(--ivory-white);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--muted-gray);
      margin-top: 0;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 1rem;
    }

    /* 联系CTA */
    .contact-section {
      background: #0f0f0f;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }

    .contact-form input,
    .contact-form textarea {
      width: 100%;
      background: transparent;
      border: 1px solid rgba(245,240,232,0.3);
      padding: 1rem;
      margin-bottom: 1.2rem;
      color: var(--ivory-white);
      border-radius: 6px;
      transition: border 0.2s;
    }

    .contact-form input:focus,
    .contact-form textarea:focus {
      border-color: var(--champagne-gold);
      outline: none;
    }

    .brand-promise {
      font-family: var(--font-serif);
      font-size: 2rem;
      color: var(--ivory-white);
    }

    /* 页脚 */
    footer {
      background: #0a0a0a;
      padding: 3rem 2rem 1.5rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 2rem;
    }

    @media (max-width: 1024px) {
      .capsule-nav .nav-links {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
      }
      #hero {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-right {
        justify-content: center;
      }
      .highlights-grid {
        grid-template-columns: repeat(2,1fr);
      }
      .cases-masonry {
        columns: 2;
      }
    }

    @media (max-width: 768px) {
      .compare-container {
        grid-template-columns: 1fr;
      }
      .compare-col.premium {
        border-left: none;
        border-top: 1px solid var(--champagne-gold);
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }