/* roulang page: index */
:root {
      --primary-deep: #2C2416;
      --primary-charcoal: #1E1E1E;
      --accent-gold: #C9A96E;
      --accent-amber: #D4A843;
      --bg-warm: #FAF8F5;
      --bg-light: #F5F2EB;
      --deep-green: #2D4A3E;
      --text-dark: #1E1E1E;
      --text-soft: #5A5348;
      --white: #FFFFFF;
      --border-light: #E5E0D5;
      --shadow-card: 0 8px 28px rgba(0,0,0,0.04);
      --shadow-hover: 0 14px 32px rgba(0,0,0,0.07);
      --radius-card: 18px;
      --radius-btn: 10px;
      --transition: all 0.25s ease;
      --font-serif: 'Noto Serif SC', 'Times New Roman', 'Songti SC', serif;
      --font-sans: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 排版 */
    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      font-weight: 700;
      letter-spacing: -0.3px;
    }

    h2 {
      font-size: 2.5rem;
      margin-bottom: 1.5rem;
      color: var(--primary-deep);
    }

    .section {
      padding: 90px 0;
    }

    .accent-line {
      width: 60px;
      height: 4px;
      background: var(--accent-gold);
      margin: 16px 0 32px;
      border-radius: 2px;
    }

    /* 导航 */
    .main-header {
      position: sticky;
      top: 0;
      z-index: 40;
      background: rgba(250,248,245,0.92);
      backdrop-filter: blur(10px);
      box-shadow: 0 4px 16px rgba(0,0,0,0.02);
      padding: 16px 0;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1250px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo-area {
      font-family: var(--font-serif);
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary-deep);
      letter-spacing: 2px;
      white-space: nowrap;
    }

    .logo-area span {
      color: var(--accent-gold);
    }

    .nav-links {
      display: flex;
      gap: 2.2rem;
      align-items: center;
      font-weight: 500;
      color: var(--primary-charcoal);
    }

    .nav-links a {
      position: relative;
      padding: 6px 0;
      font-size: 1rem;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-gold);
      transition: width 0.25s ease;
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .nav-cta {
      background: transparent;
      border: 1.5px solid var(--accent-gold);
      color: var(--accent-gold);
      padding: 10px 24px;
      border-radius: 40px;
      font-weight: 600;
      margin-left: 12px;
      transition: var(--transition);
    }

    .nav-cta:hover {
      background: var(--accent-gold);
      color: white;
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--primary-deep);
      cursor: pointer;
    }

    /* 移动导航 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 80px;
      left: 0;
      width: 100%;
      background: var(--primary-deep);
      padding: 32px 24px;
      flex-direction: column;
      gap: 24px;
      z-index: 50;
      border-radius: 0 0 24px 24px;
      box-shadow: 0 20px 30px rgba(0,0,0,0.2);
    }

    .mobile-menu a {
      color: white;
      font-size: 1.3rem;
      font-weight: 500;
      border-bottom: 1px solid rgba(255,255,255,0.15);
      padding-bottom: 12px;
    }

    /* Hero */
    .hero {
      background: linear-gradient(0deg, rgba(44,36,22,0.7) 0%, rgba(30,30,30,0.5) 100%), url('/assets/images/backpic/back-1.webp') center center/cover no-repeat;
      color: white;
      padding: 150px 0 130px;
      text-align: center;
      border-radius: 0 0 40px 40px;
    }

    .hero h1 {
      font-size: 4rem;
      font-weight: 700;
      text-shadow: 0 4px 18px rgba(0,0,0,0.3);
      margin-bottom: 20px;
    }

    .hero .sub {
      font-size: 1.3rem;
      max-width: 680px;
      margin: 0 auto 36px;
      color: rgba(255,255,245,0.92);
    }

    .btn-primary {
      background: var(--accent-gold);
      color: #1E1E1E;
      font-weight: 700;
      padding: 16px 42px;
      border-radius: var(--radius-btn);
      display: inline-block;
      transition: var(--transition);
      border: none;
      cursor: pointer;
      font-size: 1.1rem;
      box-shadow: 0 8px 18px rgba(201,169,110,0.3);
    }

    .btn-primary:hover {
      background: #dbb758;
      transform: translateY(-3px);
      box-shadow: 0 15px 25px rgba(201,169,110,0.5);
      color: #1E1E1E;
    }

    .btn-outline {
      border: 1.5px solid var(--accent-gold);
      color: var(--accent-gold);
      background: transparent;
      padding: 14px 34px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
    }

    .btn-outline:hover {
      background: rgba(201,169,110,0.1);
    }

    /* 优势卡片 */
    .advantage-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 36px;
      margin-top: 20px;
    }

    .adv-card {
      background: var(--white);
      padding: 40px 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      text-align: center;
    }

    .adv-icon {
      font-size: 2.8rem;
      color: var(--accent-gold);
      margin-bottom: 20px;
    }

    .adv-number {
      font-family: var(--font-serif);
      font-size: 3rem;
      font-weight: 700;
      color: var(--primary-deep);
    }

    .features-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      margin-top: 20px;
    }

    .feature-card {
      background: white;
      border-radius: 24px;
      padding: 36px;
      display: flex;
      align-items: center;
      gap: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }

    .feature-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .feature-img {
      width: 110px;
      height: 110px;
      border-radius: 18px;
      object-fit: cover;
    }

    .scenario-row {
      display: flex;
      align-items: center;
      gap: 50px;
      margin-bottom: 70px;
    }

    .scenario-row.reverse {
      flex-direction: row-reverse;
    }

    .scenario-text h3 {
      font-size: 2rem;
    }

    .scenario-img {
      width: 45%;
      border-radius: 28px;
    }

    .case-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }

    .case-card {
      background: #FBF9F6;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }

    .case-img {
      height: 180px;
      object-fit: cover;
    }

    .case-content {
      padding: 24px;
    }

    .metric {
      color: var(--deep-green);
      font-weight: 700;
      font-size: 1.3rem;
    }

    .faq-item {
      background: white;
      border-radius: 16px;
      margin-bottom: 16px;
      padding: 20px 28px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.02);
      cursor: pointer;
    }

    .faq-question {
      font-weight: 700;
      display: flex;
      justify-content: space-between;
    }

    .cta-section {
      background: var(--deep-green);
      color: white;
      text-align: center;
      padding: 90px 24px;
      border-radius: 40px;
      margin: 60px 0;
    }

    .footer {
      background: var(--primary-charcoal);
      color: #C9A96E;
      padding: 60px 0 30px;
    }

    @media (max-width: 1024px) {
      .advantage-grid { grid-template-columns: repeat(2,1fr); }
      .features-grid { grid-template-columns: 1fr; }
      .scenario-row { flex-direction: column; }
      .scenario-row.reverse { flex-direction: column; }
      .scenario-img { width: 100%; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero h1 { font-size: 2.6rem; }
      .advantage-grid, .case-grid { grid-template-columns: 1fr; }
      .section { padding: 60px 0; }
    }