/* roulang page: index */
:root {
      --primary-black: #1A1A1A;
      --accent-red: #8B1E2F;
      --accent-red-deep: #6B1522;
      --warm-bg: #F5F0EB;
      --white: #FFFFFF;
      --text-dark: #2C2C2C;
      --text-muted: #6B6B6B;
      --text-light: #9E9E9E;
      --border-subtle: #E0D9D1;
      --shadow-card: 0 12px 30px -12px rgba(0,0,0,0.08);
      --shadow-hover: 0 20px 40px -14px rgba(0,0,0,0.12);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --transition: all 0.25s ease;
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-sans: 'Inter', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--warm-bg);
      color: var(--text-dark);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    
    button, .button {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      background: none;
    }
    
    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      font-weight: 700;
      letter-spacing: -0.01em;
    }
    
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    
    /* 导航 */
    .nav-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 99;
      background: rgba(26, 26, 26, 0.82);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: background 0.3s ease, box-shadow 0.3s;
    }
    .nav-header.scrolled {
      background: rgba(20, 20, 20, 0.96);
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
      border-bottom: 1px solid rgba(139,30,47,0.25);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-family: var(--font-serif);
      font-size: 1.8rem;
      font-weight: 700;
      color: #FFFFFF;
      letter-spacing: 2px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .logo i {
      color: var(--accent-red);
      font-size: 2rem;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: #E6E3DF;
      font-weight: 500;
      font-size: 0.95rem;
      padding: 6px 0;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
    }
    .nav-links a:hover, .nav-links a.active {
      color: #FFFFFF;
      border-bottom-color: var(--accent-red);
    }
    .nav-cta {
      background: var(--accent-red);
      color: white !important;
      padding: 10px 22px !important;
      border-radius: 30px;
      font-weight: 600;
      margin-left: 16px;
      border-bottom: none !important;
    }
    .nav-cta:hover {
      background: var(--accent-red-deep);
      transform: translateY(-1px);
    }
    .mobile-toggle {
      display: none;
      color: white;
      font-size: 1.6rem;
    }
    
    /* Hero */
    .hero-section {
      padding: 140px 0 80px;
      background: var(--primary-black);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1.1fr;
      gap: 50px;
      align-items: center;
    }
    .hero-text h1 {
      font-size: 3.8rem;
      font-weight: 700;
      color: #FFFFFF;
      line-height: 1.2;
      margin-bottom: 20px;
      text-shadow: 0 4px 20px rgba(0,0,0,0.4);
    }
    .hero-text .sub {
      font-size: 1.25rem;
      color: #D9D0C7;
      margin-bottom: 36px;
      max-width: 80%;
    }
    .hero-buttons {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-red);
      color: white;
      padding: 14px 36px;
      border-radius: 40px;
      font-weight: 600;
      font-size: 1rem;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      box-shadow: 0 8px 18px rgba(139,30,47,0.3);
    }
    .btn-primary:hover {
      background: var(--accent-red-deep);
      transform: translateY(-3px);
      box-shadow: 0 14px 24px rgba(139,30,47,0.4);
      color: white;
    }
    .btn-outline {
      border: 2px solid var(--accent-red);
      background: transparent;
      color: white;
      padding: 14px 34px;
      border-radius: 40px;
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: var(--accent-red);
      color: white;
      transform: translateY(-2px);
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 460px;
      border-radius: 20px 20px 20px 80px;
      box-shadow: 0 30px 40px rgba(0,0,0,0.5);
      border: 1px solid rgba(255,255,255,0.1);
    }
    
    /* 核心亮点非对称网格 */
    .highlights {
      padding: 90px 0 70px;
      background: var(--white);
    }
    .section-title {
      font-size: 2.5rem;
      margin-bottom: 15px;
      color: var(--primary-black);
    }
    .highlight-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.9fr 1.1fr;
      gap: 36px;
      margin-top: 50px;
    }
    .highlight-card {
      background: var(--warm-bg);
      padding: 36px 30px;
      border-radius: var(--radius-md);
      transition: var(--transition);
      box-shadow: var(--shadow-card);
    }
    .highlight-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }
    .highlight-icon {
      font-size: 2.5rem;
      color: var(--accent-red);
      margin-bottom: 20px;
    }
    .highlight-card h3 {
      font-size: 1.6rem;
      margin-bottom: 14px;
    }
    
    /* 案例瀑布流 */
    .cases {
      padding: 80px 0;
      background: var(--warm-bg);
    }
    .masonry {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      grid-auto-rows: auto;
      gap: 28px;
      margin-top: 50px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .case-card:hover {
      transform: translateY(-10px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      height: 240px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .case-card.tall .case-img {
      height: 340px;
    }
    .case-overlay {
      position: absolute;
      bottom: 0;
      width: 100%;
      background: linear-gradient(transparent, rgba(0,0,0,0.7));
      color: white;
      padding: 28px 20px 16px;
      font-weight: 600;
    }
    .case-text {
      padding: 20px;
      border-left: 4px solid var(--accent-red);
    }
    
    /* 方案对比 */
    .plans {
      padding: 80px 0;
      background: white;
    }
    .compare-table {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 48px;
    }
    .plan-card {
      background: var(--warm-bg);
      padding: 38px 28px;
      border-radius: var(--radius-lg);
      text-align: center;
      transition: var(--transition);
      border: 1px solid transparent;
    }
    .plan-card.featured {
      background: white;
      border: 2px solid var(--accent-red);
      box-shadow: 0 20px 40px -16px rgba(139,30,47,0.25);
      transform: scale(1.03);
    }
    .plan-card h3 {
      font-size: 1.9rem;
      margin: 16px 0;
    }
    
    /* FAQ */
    .faq {
      padding: 80px 0;
      background: var(--warm-bg);
    }
    .accordion-item {
      background: white;
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.03);
    }
    .accordion-btn {
      width: 100%;
      text-align: left;
      padding: 22px 28px;
      font-weight: 600;
      font-size: 1.15rem;
      background: transparent;
      border-left: 4px solid var(--border-subtle);
      transition: 0.2s;
    }
    .accordion-btn.active {
      border-left-color: var(--accent-red);
      background: #FDFBFA;
    }
    .accordion-content {
      padding: 0 28px 20px;
      display: none;
      color: var(--text-muted);
    }
    
    /* 联系表单 */
    .contact {
      padding: 90px 0;
      background: var(--primary-black);
      color: white;
    }
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: start;
    }
    .contact-form input, .contact-form textarea {
      background: rgba(255,255,255,0.08);
      border: none;
      border-bottom: 2px solid rgba(255,255,255,0.3);
      color: white;
      padding: 14px 8px;
      margin-bottom: 22px;
      width: 100%;
      transition: 0.2s;
    }
    .contact-form input:focus {
      border-bottom-color: var(--accent-red);
      outline: none;
    }
    
    footer {
      background: #0F0F0F;
      color: #B0B0B0;
      padding: 50px 0 20px;
      border-top: 2px solid var(--accent-red);
    }
    
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .highlight-grid { grid-template-columns: 1fr 1fr; }
      .masonry { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-toggle { display: block; }
      .compare-table { grid-template-columns: 1fr; }
      .contact-grid { grid-template-columns: 1fr; }
    }