/* roulang page: index */
/* ----- 设计变量 ----- */
    :root {
      --primary-deep: #0B0C0E;
      --accent-gold: #C8A951;
      --accent-gold-dark: #B8993A;
      --accent-red: #E63946;
      --bg-warm: #F5F1EB;
      --text-light: #F0EDE6;
      --text-muted: #9DA1A8;
      --text-dark: #1E2022;
      --card-bg: rgba(255,255,255,0.03);
      --card-border: rgba(200,169,81,0.18);
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.25);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.5);
      --radius-card: 14px;
      --radius-btn: 10px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Roboto', sans-serif;
      --transition: all 0.25s ease;
      --nav-height: 76px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-body);
      background-color: var(--primary-deep);
      color: var(--text-light);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 700;
      letter-spacing: 0.02em;
    }
    
    h2 {
      font-size: 2.25rem;
      margin-bottom: 0.5rem;
      color: var(--accent-gold);
      position: relative;
      display: inline-block;
    }
    
    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60%;
      height: 3px;
      background: var(--accent-red);
      border-radius: 2px;
    }
    
    h3 {
      font-size: 1.4rem;
      font-weight: 650;
      margin-bottom: 0.75rem;
      color: var(--text-dark);
    }
    
    p {
      font-size: 1rem;
      color: #d1d4d9;
      margin-bottom: 1.2rem;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    
    img {
      max-width: 100%;
      display: block;
      border-radius: var(--radius-card);
    }
    
    button, .btn {
      font-family: var(--font-body);
      font-weight: 600;
      cursor: pointer;
      border: none;
      border-radius: var(--radius-btn);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    
    /* ----- 导航 ----- */
    .header {
      position: fixed;
      top: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(11,12,14,0.8);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(200,169,81,0.15);
      height: var(--nav-height);
      display: flex;
      align-items: center;
    }
    
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    
    .logo {
      font-family: var(--font-heading);
      font-size: 1.8rem;
      font-weight: 750;
      color: var(--accent-gold);
      letter-spacing: 0.08em;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    
    .logo i {
      font-size: 2rem;
      color: var(--accent-red);
    }
    
    .nav-menu {
      display: flex;
      gap: 2.5rem;
      align-items: center;
      list-style: none;
    }
    
    .nav-menu a {
      font-weight: 500;
      color: #ccc;
      font-size: 1rem;
      padding: 6px 0;
      border-bottom: 2px solid transparent;
    }
    
    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--accent-gold);
      border-bottom-color: var(--accent-gold);
    }
    
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--accent-gold);
      background: transparent;
      border: none;
    }
    
    /* 移动端抽屉菜单 */
    .mobile-drawer {
      position: fixed;
      top: 0;
      right: -100%;
      width: 75%;
      max-width: 320px;
      height: 100vh;
      background: #0f1114;
      backdrop-filter: blur(20px);
      padding: 2rem;
      display: flex;
      flex-direction: column;
      gap: 2.5rem;
      transition: right 0.35s ease;
      z-index: 1001;
      border-left: 1px solid var(--accent-gold);
    }
    
    .mobile-drawer.open {
      right: 0;
    }
    
    .mobile-drawer a {
      font-size: 1.5rem;
      font-weight: 600;
      color: #eee;
    }
    
    .drawer-close {
      align-self: flex-end;
      background: none;
      border: none;
      color: var(--accent-gold);
      font-size: 2rem;
      cursor: pointer;
    }
    
    /* ----- Hero 双栏杂志 ----- */
    .hero {
      padding: calc(var(--nav-height) + 50px) 0 80px;
      background: radial-gradient(circle at 30% 40%, #1b1d22 0%, #0B0C0E 85%);
    }
    
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    
    .hero-content h1 {
      font-size: 3.3rem;
      font-weight: 800;
      color: var(--accent-gold);
      line-height: 1.2;
      margin-bottom: 1.5rem;
      text-shadow: 0 0 20px rgba(200,169,81,0.3);
    }
    
    .hero-sub {
      font-size: 1.2rem;
      color: #cbd0d6;
      margin-bottom: 2.5rem;
      max-width: 90%;
    }
    
    .btn-group {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }
    
    .btn-primary {
      background: linear-gradient(135deg, #C8A951, #B8993A);
      color: #0B0C0E;
      padding: 0.9rem 2.2rem;
      font-size: 1rem;
      font-weight: 700;
      box-shadow: 0 6px 20px rgba(200,169,81,0.3);
    }
    
    .btn-primary:hover {
      filter: brightness(1.2);
      box-shadow: 0 10px 28px rgba(200,169,81,0.5);
      transform: translateY(-2px);
    }
    
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-gold);
      color: var(--accent-gold);
      padding: 0.9rem 2.2rem;
    }
    
    .btn-outline:hover {
      background: rgba(200,169,81,0.12);
      border-color: #e0c46b;
    }
    
    .hero-image {
      position: relative;
      border: 2px solid var(--accent-gold);
      border-radius: 24px;
      overflow: hidden;
      transform: rotate(-1deg);
      box-shadow: 0 20px 40px rgba(0,0,0,0.7);
    }
    
    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    
    /* 板块通用 */
    .section {
      padding: 90px 0;
    }
    
    .section-light {
      background-color: var(--bg-warm);
    }
    
    .section-light h2,
    .section-light h3,
    .section-light p {
      color: #1e2022;
    }
    
    .section-light h2::after {
      background: var(--accent-red);
    }
    
    .section-title {
      text-align: center;
      margin-bottom: 3.5rem;
    }
    
    /* 核心优势卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
      margin-top: 2rem;
    }
    
    .feature-card {
      background: #fff;
      border-radius: var(--radius-card);
      padding: 2.2rem 1.8rem;
      box-shadow: var(--shadow-sm);
      border: 1px solid rgba(200,169,81,0.2);
      transition: var(--transition);
      text-align: center;
    }
    
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--accent-gold);
    }
    
    .feature-icon {
      font-size: 2.8rem;
      color: var(--accent-gold);
      margin-bottom: 1.5rem;
      transition: color 0.2s;
    }
    
    .feature-card:hover .feature-icon {
      color: var(--accent-red);
    }
    
    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.8rem;
    }
    
    .highlight-item {
      position: relative;
      border-radius: var(--radius-card);
      overflow: hidden;
      aspect-ratio: 4/3;
      background: #2a2d33;
    }
    
    .highlight-item.large {
      grid-column: span 2;
    }
    
    .highlight-item img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s;
    }
    
    .highlight-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(0,0,0,0.8));
      padding: 1.8rem;
      color: white;
      font-weight: 650;
      font-size: 1.2rem;
      transition: background 0.3s;
    }
    
    .highlight-item:hover .highlight-overlay {
      background: linear-gradient(transparent, rgba(200,169,81,0.7));
    }
    
    /* 案例瀑布 */
    .case-item {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2.5rem;
      margin-bottom: 3.5rem;
      align-items: center;
    }
    
    .case-img img {
      border-radius: 18px;
      box-shadow: 0 15px 30px rgba(0,0,0,0.5);
    }
    
    .case-stats {
      display: flex;
      gap: 2rem;
      margin-top: 1.5rem;
    }
    
    .stat {
      font-size: 2rem;
      font-weight: 800;
      color: var(--accent-red);
    }
    
    /* 方案对比 */
    .compare-cards {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
    }
    
    .compare-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      color: #1e2022;
    }
    
    .compare-card.highlight {
      border: 2px solid var(--accent-gold);
      background: #fffef7;
    }
    
    .compare-row {
      display: flex;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px solid #e0dcd5;
    }
    
    /* FAQ */
    .faq-item {
      background: #16191d;
      border-radius: 12px;
      margin-bottom: 1rem;
      padding: 1.2rem 1.8rem;
      border-left: 4px solid transparent;
      transition: 0.25s;
    }
    
    .faq-item.active {
      border-left-color: var(--accent-gold);
      background: #1e2126;
    }
    
    .faq-question {
      font-weight: 650;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      color: #f0ede6;
    }
    
    /* CTA */
    .cta-block {
      background: #0B0C0E;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    
    .cta-form input, .cta-form textarea {
      width: 100%;
      background: #1c1f24;
      border: 1px solid var(--accent-gold);
      border-radius: 8px;
      padding: 0.9rem;
      margin-bottom: 1rem;
      color: white;
    }
    
    .btn-submit {
      background: var(--accent-red);
      color: white;
      padding: 0.9rem 2rem;
      font-weight: bold;
    }
    
    .footer {
      background: #0a0b0d;
      padding: 3rem 0;
      border-top: 1px solid var(--accent-gold);
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 2rem;
    }
    
    @media (max-width: 1024px) {
      .hero-grid, .case-item, .cta-block {
        grid-template-columns: 1fr;
      }
      .features-grid { grid-template-columns: repeat(2,1fr); }
    }
    
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: block; }
      .features-grid, .highlights-grid { grid-template-columns: 1fr; }
      .highlight-item.large { grid-column: span 1; }
      .compare-cards { grid-template-columns: 1fr; }
      h2 { font-size: 1.9rem; }
      .hero-content h1 { font-size: 2.4rem; }
    }