/* roulang page: index */
:root {
      --deep-carbon: #1A1A1A;
      --pure-black: #0D0D0D;
      --bordeaux: #A52A2A;
      --bordeaux-hover: #8B0000;
      --bone-white: #F5F0E8;
      --dark-gold: #B8860B;
      --copper: #C49B2C;
      --bg-light: #FAFAFA;
      --text-main: #333333;
      --text-soft: #555555;
      --text-muted: #888888;
      --border-light: #E0DCD5;
      --shadow-card: 0 10px 25px -8px rgba(0,0,0,0.08), 0 4px 8px rgba(0,0,0,0.03);
      --shadow-hover: 0 20px 35px -12px rgba(0,0,0,0.12), 0 8px 14px rgba(0,0,0,0.04);
      --font-en: 'Oswald', 'Impact', 'Arial Black', sans-serif;
      --font-cn: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --container-max: 1200px;
      --radius-md: 8px;
      --radius-lg: 16px;
      --radius-pill: 100px;
    }

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

    body {
      font-family: var(--font-cn);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 悬浮胶囊导航 */
    .capsule-nav {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 620px;
      background: rgba(26, 26, 26, 0.85);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-radius: 60px;
      padding: 8px 28px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 30px;
      z-index: 1000;
      box-shadow: 0 12px 28px rgba(0,0,0,0.25);
      border: 1px solid rgba(255,255,255,0.08);
    }

    .nav-logo {
      font-family: var(--font-en);
      font-weight: 700;
      font-size: 1.25rem;
      letter-spacing: 1px;
      color: var(--bone-white);
      white-space: nowrap;
      margin-right: 8px;
    }

    .nav-links {
      display: flex;
      gap: 24px;
      align-items: center;
      flex-wrap: wrap;
      justify-content: center;
    }

    .nav-links a {
      color: var(--bone-white);
      font-weight: 500;
      font-size: 0.9rem;
      transition: color 0.2s, border-bottom 0.2s;
      border-bottom: 2px solid transparent;
      padding-bottom: 4px;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: #fff;
      border-bottom-color: var(--bordeaux);
    }

    /* Hero 双栏 */
    .hero {
      padding: 140px 0 80px;
      background-color: #F9F7F4;
      position: relative;
      overflow: hidden;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 5fr 5fr;
      gap: 50px;
      align-items: center;
    }

    .hero-text {
      padding-right: 20px;
    }

    .hero h1 {
      font-family: var(--font-en);
      font-size: clamp(3rem, 5vw, 4.2rem);
      font-weight: 800;
      letter-spacing: -0.5px;
      line-height: 1.1;
      color: var(--deep-carbon);
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 1.3rem;
      font-weight: 500;
      color: #444;
      margin-bottom: 20px;
    }

    .hero-desc {
      color: var(--text-soft);
      margin-bottom: 32px;
      max-width: 480px;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--bordeaux);
      color: white;
      border: none;
      padding: 14px 34px;
      border-radius: 40px;
      font-weight: 700;
      letter-spacing: 1px;
      cursor: pointer;
      transition: background 0.25s, transform 0.2s;
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      background: var(--bordeaux-hover);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--deep-carbon);
      color: var(--deep-carbon);
      padding: 14px 34px;
      border-radius: 40px;
      font-weight: 700;
      letter-spacing: 1px;
      cursor: pointer;
      transition: all 0.25s;
    }

    .btn-outline:hover {
      background: var(--deep-carbon);
      color: white;
    }

    .hero-image {
      position: relative;
      transform: rotate(1.5deg);
      border-radius: 20px;
      overflow: hidden;
      box-shadow: var(--shadow-card);
      background: #1e1e1e;
    }

    .hero-image img {
      width: 100%;
      height: auto;
      min-height: 350px;
      object-fit: cover;
      filter: brightness(0.9);
    }

    /* 亮点网格 错落 */
    .highlights {
      padding: 80px 0;
    }

    .section-title {
      font-family: var(--font-en);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--deep-carbon);
      margin-bottom: 16px;
    }

    .highlight-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.9fr 0.9fr;
      gap: 28px;
      margin-top: 48px;
    }

    .highlight-card {
      background: var(--bone-white);
      border-radius: var(--radius-md);
      padding: 32px 28px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      border: 1px solid transparent;
    }

    .highlight-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--bordeaux);
    }

    .highlight-number {
      font-family: var(--font-en);
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--dark-gold);
      line-height: 1;
    }

    .highlight-card h3 {
      font-size: 1.5rem;
      font-weight: 700;
      margin: 16px 0 8px;
    }

    .highlight-card p {
      color: var(--text-soft);
    }

    /* 案例瀑布流 */
    .cases {
      padding: 80px 0;
      background: #fff;
    }

    .masonry {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }

    .case-card {
      background: white;
      border-radius: 12px;
      overflow: hidden;
      box-shadow: 0 8px 18px rgba(0,0,0,0.04);
      transition: all 0.3s;
    }

    .case-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }

    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      position: relative;
    }

    .case-content {
      padding: 20px;
    }

    .case-content h3 {
      font-weight: 700;
      font-size: 1.25rem;
      margin-bottom: 8px;
    }

    /* 方案对比 */
    .solutions {
      padding: 80px 0;
      background: #F9F7F4;
    }

    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0;
      margin-top: 40px;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }

    .compare-left {
      background: #E8E8E8;
      padding: 40px;
      color: #444;
    }

    .compare-right {
      background: var(--bone-white);
      padding: 40px;
      border-left: 3px solid var(--bordeaux);
    }

    .compare-list {
      list-style: none;
      margin-top: 24px;
    }

    .compare-list li {
      margin-bottom: 18px;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    /* FAQ */
    .faq {
      padding: 80px 0;
    }

    .faq-item {
      background: var(--bone-white);
      border-radius: 10px;
      margin-bottom: 16px;
      padding: 0 24px;
      transition: all 0.2s;
      border-left: 4px solid transparent;
    }

    .faq-item:hover {
      border-left-color: var(--bordeaux);
    }

    .faq-question {
      font-weight: 700;
      padding: 20px 0;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .faq-answer {
      padding: 0 0 22px;
      color: var(--text-soft);
      display: none;
    }

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

    /* CTA */
    .contact-cta {
      background: var(--deep-carbon);
      padding: 80px 0;
    }

    .cta-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .cta-text h2 {
      color: white;
    }

    .contact-form input,
    .contact-form textarea {
      width: 100%;
      padding: 14px;
      background: rgba(255,255,255,0.08);
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: 8px;
      color: white;
      margin-bottom: 16px;
    }

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

    .footer {
      background: #0A0A0A;
      color: #888;
      padding: 40px 0;
      text-align: center;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .highlight-grid { grid-template-columns: 1fr 1fr; }
      .masonry { grid-template-columns: 1fr 1fr; }
      .capsule-nav { max-width: 90%; }
    }

    @media (max-width: 768px) {
      .capsule-nav { gap: 16px; padding: 8px 18px; }
      .nav-links { gap: 12px; font-size: 0.8rem; }
      .compare-grid, .cta-grid { grid-template-columns: 1fr; }
      .masonry { grid-template-columns: 1fr; }
    }