/* roulang page: index */
:root {
      --deep-wood: #3E2723;
      --champagne-gold: #D4AF37;
      --ivory-white: #FFFFF0;
      --soft-gray: #F5F0EB;
      --text-dark: #2C1E1A;
      --text-soft: #5E4B44;
      --border-light: rgba(62,39,35,0.12);
      --shadow-sm: 0 4px 20px rgba(62,39,35,0.08);
      --shadow-hover: 0 8px 30px rgba(62,39,35,0.15);
      --radius: 8px;
      --nav-width: 240px;
      --transition: 0.3s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--ivory-white);
      color: var(--text-dark);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3 {
      font-family: "Noto Serif SC", "Songti SC", "Times New Roman", serif;
      font-weight: 700;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      border: none;
      background: none;
      font-family: inherit;
    }
    .container-main {
      margin-left: var(--nav-width);
      width: calc(100% - var(--nav-width));
      max-width: 1200px;
      margin-right: auto;
      padding: 0 40px;
    }
    @media (max-width: 1024px) {
      .container-main {
        margin-left: 0;
        width: 100%;
        padding: 0 24px;
      }
    }
    /* 左侧竖向导航 */
    .side-nav {
      position: fixed;
      left: 0;
      top: 0;
      width: var(--nav-width);
      height: 100vh;
      background-color: var(--deep-wood);
      color: var(--ivory-white);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding: 40px 24px;
      z-index: 50;
      box-shadow: 2px 0 15px rgba(0,0,0,0.08);
    }
    .nav-brand {
      font-family: "Noto Serif SC", serif;
      font-size: 1.6rem;
      font-weight: 700;
      letter-spacing: 2px;
      margin-bottom: 48px;
      color: var(--champagne-gold);
    }
    .nav-brand small {
      display: block;
      font-size: 0.7rem;
      font-weight: 400;
      letter-spacing: 1px;
      color: rgba(255,255,240,0.7);
      margin-top: 4px;
    }
    .nav-menu {
      list-style: none;
      margin: 0;
      padding: 0;
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .nav-menu li a {
      display: block;
      padding: 10px 12px;
      color: rgba(255,255,240,0.8);
      border-left: 3px solid transparent;
      font-size: 0.95rem;
      transition: var(--transition);
    }
    .nav-menu li a:hover,
    .nav-menu li a.active {
      color: var(--champagne-gold);
      border-left-color: var(--champagne-gold);
      background: rgba(212,175,55,0.08);
    }
    .nav-footer {
      font-size: 0.8rem;
      color: rgba(255,255,240,0.5);
      display: flex;
      gap: 16px;
      margin-top: 24px;
    }
    .nav-footer i {
      font-size: 1.2rem;
      cursor: pointer;
      transition: var(--transition);
    }
    .nav-footer i:hover {
      color: var(--champagne-gold);
    }
    /* 移动端顶部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--deep-wood);
      color: white;
      z-index: 60;
      padding: 12px 20px;
      align-items: center;
      justify-content: space-between;
    }
    .mobile-brand {
      font-family: "Noto Serif SC", serif;
      font-size: 1.3rem;
      color: var(--champagne-gold);
      font-weight: 700;
    }
    .hamburger {
      font-size: 1.8rem;
      color: var(--ivory-white);
      background: none;
      border: none;
    }
    @media (max-width: 1024px) {
      .side-nav {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
      body {
        padding-top: 70px;
      }
      .container-main {
        margin-left: 0;
        width: 100%;
      }
    }
    /* 板块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 80px 0;
      }
    }
    .section-title {
      font-size: 2.25rem;
      margin-bottom: 16px;
      color: var(--deep-wood);
      position: relative;
      display: inline-block;
    }
    .section-title:after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60px;
      height: 2px;
      background: var(--champagne-gold);
    }
    .section-sub {
      font-size: 1.1rem;
      color: var(--text-soft);
      margin-bottom: 48px;
      max-width: 600px;
    }
    .btn-primary {
      background: var(--champagne-gold);
      color: var(--deep-wood);
      padding: 14px 36px;
      border-radius: 4px;
      font-weight: 600;
      display: inline-block;
      transition: var(--transition);
      border: 1px solid transparent;
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      background: var(--deep-wood);
      color: var(--champagne-gold);
      border-color: var(--champagne-gold);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--champagne-gold);
      color: var(--champagne-gold);
      padding: 12px 32px;
      border-radius: 4px;
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: var(--champagne-gold);
      color: var(--deep-wood);
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, rgba(62,39,35,0.85) 0%, rgba(42,28,24,0.9) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      color: white;
      min-height: 100vh;
      display: flex;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 3rem;
      color: var(--ivory-white);
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero-content h1 span {
      color: var(--champagne-gold);
    }
    .hero-content p {
      font-size: 1.2rem;
      opacity: 0.9;
      max-width: 600px;
      margin-bottom: 36px;
    }
    @media (max-width: 768px) {
      .hero-content h1 {
        font-size: 2.2rem;
      }
    }
    /* 图文交替布局 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .feature-row.reverse {
      flex-direction: row-reverse;
    }
    .feature-text {
      flex: 1;
    }
    .feature-img {
      flex: 1;
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .feature-img img {
      width: 100%;
      height: auto;
    }
    @media (max-width: 768px) {
      .feature-row, .feature-row.reverse {
        flex-direction: column;
        gap: 30px;
      }
    }
    /* 场景卡片 */
    .scenario-card {
      background-size: cover;
      background-position: center;
      border-radius: var(--radius);
      padding: 60px 40px;
      color: white;
      position: relative;
      margin-bottom: 32px;
      overflow: hidden;
    }
    .scenario-card::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(30,20,18,0.7);
      z-index: 1;
    }
    .scenario-content {
      position: relative;
      z-index: 2;
    }
    /* 横向滚动案例 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
      scrollbar-width: thin;
    }
    .case-card {
      min-width: 300px;
      background: white;
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      border-top: 4px solid var(--champagne-gold);
      flex: 0 0 auto;
    }
    /* 价格非对称 */
    .pricing-grid {
      display: flex;
      align-items: flex-end;
      justify-content: center;
      gap: 32px;
      flex-wrap: wrap;
    }
    .pricing-item {
      background: white;
      border-radius: var(--radius);
      padding: 40px 28px;
      box-shadow: var(--shadow-sm);
      flex: 1;
      min-width: 240px;
      max-width: 320px;
    }
    .pricing-item.featured {
      border: 2px solid var(--champagne-gold);
      transform: scale(1.03);
      box-shadow: var(--shadow-hover);
    }
    /* FAQ */
    .accordion-title {
      font-size: 1.1rem;
      font-weight: 600;
      color: var(--deep-wood);
      border-bottom: 1px solid var(--border-light);
      padding: 18px 0;
      cursor: pointer;
      display: flex;
      align-items: center;
    }
    .accordion-title::before {
      content: "◆";
      color: var(--champagne-gold);
      margin-right: 12px;
      transition: transform 0.2s;
    }
    .accordion-item.is-active .accordion-title::before {
      transform: rotate(90deg);
    }
    /* CTA */
    .cta-final {
      background: var(--deep-wood);
      color: white;
    }
    .cta-input {
      background: transparent;
      border: none;
      border-bottom: 1px solid rgba(255,255,240,0.5);
      padding: 12px 8px;
      color: white;
      width: 100%;
      margin-bottom: 16px;
    }
    .cta-input:focus {
      outline: none;
      border-bottom-color: var(--champagne-gold);
    }
    footer {
      background: var(--deep-wood);
      color: rgba(255,255,240,0.8);
      padding: 40px 0;
      font-size: 0.9rem;
    }