/* roulang page: index */
:root {
      --deep-green: #0B1A1A;
      --deep-green-light: #132626;
      --warm-gold: #D4A843;
      --warm-gold-light: #E8C56D;
      --gold-gradient: linear-gradient(135deg, #D4A843 0%, #E8C56D 100%);
      --cool-gray: #A3B5B1;
      --off-white: #F4F1EA;
      --shadow-sm: 0 8px 30px rgba(0,0,0,0.05);
      --shadow-hover: 0 16px 40px rgba(0,0,0,0.1);
      --radius-card: 24px;
      --radius-button: 40px;
      --font-display: 'Cormorant Garamond', serif;
      --font-heading: 'Inter', sans-serif;
      --font-body: 'Inter', 'Noto Sans SC', sans-serif;
      --font-mono: 'JetBrains Mono', monospace;
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--off-white);
      color: var(--deep-green);
      line-height: 1.6;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input {
      font-family: inherit;
      outline: none;
      border: none;
      background: none;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      padding: 20px 40px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: transparent;
      transition: background 0.4s, backdrop-filter 0.4s, padding 0.3s;
    }
    .navbar.scrolled {
      background: rgba(244, 241, 234, 0.85);
      backdrop-filter: blur(12px);
      padding: 14px 40px;
      box-shadow: 0 4px 20px rgba(0,0,0,0.03);
    }
    .logo {
      font-family: var(--font-display);
      font-style: italic;
      font-weight: 600;
      font-size: 1.9rem;
      letter-spacing: -0.3px;
      color: var(--deep-green);
      display: flex;
      align-items: baseline;
      gap: 2px;
    }
    .logo .gold-accent {
      color: var(--warm-gold);
      font-style: normal;
      font-weight: 700;
      margin-right: 2px;
    }
    .nav-links {
      display: flex;
      gap: 36px;
      align-items: center;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--deep-green);
      letter-spacing: 0.3px;
      position: relative;
      padding-bottom: 6px;
      transition: color 0.2s;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--gold-gradient);
      transition: width 0.3s ease;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--warm-gold);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .mobile-menu-toggle {
      display: none;
      font-size: 1.6rem;
      color: var(--deep-green);
      background: none;
      border: none;
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
      .navbar {
        padding: 16px 20px;
      }
      .navbar.scrolled {
        padding: 12px 20px;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .mobile-nav {
        position: fixed;
        bottom: 20px;
        left: 20px;
        right: 20px;
        background: rgba(11,26,26,0.92);
        backdrop-filter: blur(20px);
        border-radius: 40px;
        padding: 10px 24px;
        display: flex;
        justify-content: space-around;
        align-items: center;
        z-index: 1100;
        box-shadow: 0 10px 30px rgba(0,0,0,0.4);
      }
      .mobile-nav a {
        color: var(--cool-gray);
        font-size: 0.7rem;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 4px;
        font-weight: 500;
        transition: color 0.2s;
      }
      .mobile-nav a i {
        font-size: 1.2rem;
      }
      .mobile-nav a.active {
        color: var(--warm-gold);
      }
      .desktop-only {
        display: none;
      }
    }
    @media (min-width: 769px) {
      .mobile-nav {
        display: none;
      }
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 80% 30%, #132626 0%, #0B1A1A 75%);
      position: relative;
      overflow: hidden;
      padding: 120px 0 80px;
    }
    .hero-bg-layer {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/hero-bg.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      z-index: 0;
    }
    .hero-particles {
      position: absolute;
      bottom: 0;
      right: 0;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle at 30% 70%, rgba(212,168,67,0.15) 0%, transparent 70%);
      z-index: 1;
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 500px;
    }
    .hero-graphic {
      flex: 1 1 400px;
      height: 380px;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .dynamic-lines {
      width: 100%;
      height: 100%;
      position: relative;
    }
    .line-node {
      position: absolute;
      background: var(--warm-gold);
      border-radius: 50%;
      opacity: 0.7;
      box-shadow: 0 0 18px var(--warm-gold);
    }
    h1 {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 3.5rem;
      line-height: 1.15;
      margin-bottom: 1.5rem;
      color: white;
    }
    h1 .gold {
      color: var(--warm-gold);
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--cool-gray);
      max-width: 480px;
      margin-bottom: 2.5rem;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--gold-gradient);
      color: #0B1A1A;
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-button);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: var(--transition-smooth);
      box-shadow: 0 8px 18px rgba(212,168,67,0.3);
      letter-spacing: 0.4px;
    }
    .btn-primary:hover {
      box-shadow: 0 0 28px rgba(212,168,67,0.7);
      transform: scale(1.03);
    }
    .btn-outline {
      border: 1.5px solid var(--warm-gold);
      color: var(--warm-gold);
      background: transparent;
      padding: 14px 36px;
      border-radius: var(--radius-button);
      font-weight: 600;
      transition: var(--transition-smooth);
    }
    .btn-outline:hover {
      background: rgba(212,168,67,0.1);
    }
    @media (max-width: 768px) {
      h1 {
        font-size: 2.5rem;
      }
      .hero-graphic {
        height: 250px;
      }
    }
    section {
      padding: 100px 0;
    }
    .section-title {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 2.4rem;
      margin-bottom: 1rem;
      color: var(--deep-green);
    }
    .section-sub {
      color: var(--cool-gray);
      font-size: 1.1rem;
    }
    /* 解决方案卡片 */
    .solution-grid {
      display: flex;
      gap: 40px;
      align-items: center;
      flex-wrap: wrap;
    }
    .big-card {
      background: var(--off-white);
      border-radius: var(--radius-card);
      padding: 40px;
      box-shadow: var(--shadow-sm);
      flex: 1 1 300px;
    }
    .badge-group {
      display: flex;
      flex-direction: column;
      gap: 24px;
      flex: 1 1 280px;
    }
    .stat-badge {
      background: var(--off-white);
      border-radius: 20px;
      padding: 20px 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .stat-number {
      font-family: var(--font-display);
      font-size: 2.4rem;
      color: var(--warm-gold);
      font-weight: 700;
    }
    /* 优势卡片 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .adv-card {
      background: var(--off-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
    }
    .adv-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .adv-number {
      font-family: var(--font-display);
      font-size: 3.4rem;
      color: var(--warm-gold);
    }
    .progress-bar {
      height: 4px;
      background: #ddd;
      border-radius: 4px;
      margin: 14px 0;
    }
    .progress-fill {
      height: 100%;
      background: var(--gold-gradient);
      border-radius: 4px;
      width: 0%;
    }
    /* 服务网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--off-white);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: var(--transition-smooth);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }
    .service-icon {
      font-size: 2rem;
      color: var(--warm-gold);
      margin-bottom: 1rem;
    }
    .learn-more {
      margin-top: auto;
      color: var(--warm-gold);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 5px;
    }
    /* 画廊 */
    .gallery-scroll {
      display: flex;
      gap: 30px;
      overflow-x: auto;
      padding-bottom: 20px;
    }
    .case-card {
      min-width: 320px;
      background: var(--off-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .faq-item {
      background: var(--off-white);
      border-radius: 16px;
      padding: 20px;
      cursor: pointer;
      border-left: 3px solid transparent;
      transition: 0.2s;
    }
    .faq-item.active {
      border-left: 3px solid var(--warm-gold);
      background: #faf8f3;
    }
    /* CTA */
    .cta-block {
      background: #0B1A1A;
      text-align: center;
      padding: 80px 20px;
    }
    .footer {
      background: #0B1A1A;
      color: var(--cool-gray);
      padding: 60px 0 30px;
    }
    @media (max-width: 768px) {
      .advantages-grid, .services-grid, .faq-grid {
        grid-template-columns: 1fr;
      }
    }