/* roulang page: index */
:root {
      --orange-dark: #C23D08;
      --orange: #E8470B;
      --gold: #C9A96E;
      --black: #1A1A1A;
      --gray-bg: #F4F2EF;
      --white: #FFFFFF;
      --gray-light: rgba(26,26,26,0.05);
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 12px 32px rgba(0,0,0,0.08);
      --radius-md: 20px;
      --radius-pill: 40px;
      --radius-card: 16px;
      --transition: 0.3s ease;
      --max-width: 1280px;
      --space-section: 100px;
    }

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

    body {
      font-family: 'Noto Sans SC', sans-serif;
      background-color: var(--gray-bg);
      color: var(--black);
      line-height: 1.7;
      font-weight: 300;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    button, .btn {
      cursor: pointer;
      font-family: 'Inter', sans-serif;
      font-weight: 600;
      font-size: 16px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition);
      border: none;
      outline: none;
    }

    /* ---------- 导航 ---------- */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--white);
      z-index: 100;
      height: 72px;
      border-bottom: 1px solid rgba(0,0,0,0.02);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-family: 'Noto Sans SC', sans-serif;
      font-weight: 700;
      font-size: 28px;
      letter-spacing: 2px;
      color: var(--black);
    }
    .logo .gold-dot {
      color: var(--gold);
      font-weight: 700;
      margin: 0 1px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
      font-family: 'Inter', sans-serif;
      font-weight: 400;
      font-size: 15px;
      color: var(--black);
      list-style: none;
    }
    .nav-links a {
      position: relative;
      padding: 8px 2px;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--orange);
    }
    .nav-active {
      color: var(--orange) !important;
      font-weight: 500;
    }
    .nav-active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--orange);
      transition: width 0.2s;
    }

    .mobile-nav-bottom {
      display: none;
    }

    /* hero */
    .hero-section {
      padding: 140px 0 100px;
      background: radial-gradient(circle at 30% 30%, #2a2a2a, #141414);
      color: white;
      position: relative;
      overflow: hidden;
    }

    .hero-content {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
      position: relative;
      z-index: 3;
    }

    .hero-text {
      flex: 1 1 480px;
    }
    .hero-text h1 {
      font-family: 'Inter', sans-serif;
      font-weight: 800;
      font-size: 58px;
      line-height: 1.15;
      letter-spacing: -0.02em;
      color: white;
      margin-bottom: 20px;
      animation: fadeInUp 0.7s ease;
    }
    .hero-text .sub {
      font-family: 'Noto Sans SC', sans-serif;
      font-weight: 300;
      font-size: 18px;
      opacity: 0.85;
      margin-bottom: 32px;
      max-width: 500px;
      animation: fadeInUp 0.8s ease;
    }
    .hero-btns {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
      animation: fadeInUp 0.9s ease;
    }

    .hero-img-area {
      flex: 1 1 400px;
      position: relative;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 350px;
      border-radius: 32px;
      box-shadow: 0 20px 30px rgba(0,0,0,0.3);
      opacity: 0.95;
    }

    /* 装饰粒子 */
    .particle-bg {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 20% 60%, rgba(201,169,110,0.15) 0%, transparent 7%);
      pointer-events: none;
    }

    .btn-primary {
      background: var(--orange);
      color: white;
      border-radius: var(--radius-pill);
      padding: 15px 42px;
      box-shadow: 0 8px 16px rgba(232,71,11,0.2);
    }
    .btn-primary:hover {
      background: var(--orange-dark);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      color: white;
      border: 1.5px solid var(--orange);
      border-radius: var(--radius-pill);
      padding: 15px 38px;
    }
    .btn-outline:hover {
      background: rgba(232,71,11,0.1);
    }

    section {
      padding: 90px 0;
    }

    .section-title {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 48px;
    }
    .section-title h2 {
      font-family: 'Noto Sans SC', sans-serif;
      font-weight: 700;
      font-size: 40px;
      line-height: 1.25;
    }
    .section-title .decor {
      width: 4px;
      height: 36px;
      background: var(--gold);
      border-radius: 2px;
    }

    /* 不对称优势 */
    .features-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      align-items: start;
    }
    .big-card {
      background: linear-gradient(145deg, #f7f5f0, #ffffff);
      padding: 40px 36px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      grid-row: span 2;
    }
    .small-card-stack {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .feat-card {
      background: var(--white);
      padding: 30px 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .feat-card:hover, .big-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }

    .feat-icon {
      font-size: 30px;
      color: var(--gold);
      margin-bottom: 16px;
    }

    .capability-row {
      display: flex;
      align-items: center;
      gap: 50px;
      margin-bottom: 80px;
    }
    .capability-row.reverse {
      flex-direction: row-reverse;
    }
    .cap-img {
      flex: 1 1 50%;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 10px 25px rgba(0,0,0,0.05);
    }
    .cap-text {
      flex: 1 1 50%;
    }

    .scenario-scroll {
      display: flex;
      gap: 20px;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      padding-bottom: 10px;
    }
    .scenario-card {
      flex: 0 0 300px;
      scroll-snap-align: start;
      background: white;
      border-radius: 24px;
      padding: 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .scenario-card:hover {
      transform: translateY(-4px);
    }

    .stats-wall {
      display: flex;
      gap: 40px;
      flex-wrap: wrap;
      margin: 35px 0;
    }
    .stat-item .number {
      font-family: 'Inter', sans-serif;
      font-weight: 800;
      font-size: 48px;
      color: var(--gold);
    }

    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .price-card {
      background: var(--white);
      border-radius: 20px;
      padding: 32px 20px;
      text-align: center;
      border: 1px solid rgba(0,0,0,0.04);
      transition: var(--transition);
    }
    .price-card.featured {
      border: 2px solid var(--orange);
      position: relative;
    }
    .badge {
      background: var(--orange);
      color: white;
      font-size: 13px;
      padding: 4px 12px;
      border-radius: 30px;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }
    .price-num {
      font-size: 36px;
      font-weight: 800;
      font-family: 'Inter',sans-serif;
    }

    .faq-item {
      background: var(--white);
      border-bottom: 1px solid #eee;
      padding: 18px 0;
    }
    .faq-title {
      font-weight: 500;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    .dark-cta {
      background: var(--black);
      color: white;
      text-align: center;
      padding: 80px 0;
      border-radius: 0;
    }

    footer {
      background: white;
      padding: 60px 0 30px;
      color: #333;
    }

    @keyframes fadeInUp {
      from { opacity: 0; transform: translateY(18px); }
      to { opacity: 1; transform: translateY(0); }
    }

    @media (max-width: 1024px) {
      .pricing-grid { grid-template-columns: repeat(2,1fr); }
      .capability-row { flex-direction: column; }
      .features-grid { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .main-header { display: none; }
      .mobile-nav-bottom {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: white;
        height: 68px;
        justify-content: space-around;
        align-items: center;
        box-shadow: 0 -4px 12px rgba(0,0,0,0.04);
        z-index: 110;
        border-radius: 24px 24px 0 0;
      }
      .mobile-nav-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        font-size: 12px;
        color: #444;
      }
      .hero-content { flex-direction: column; }
      h1 { font-size: 36px; }
      .hero-img-area { min-height: 240px; }
      .pricing-grid { grid-template-columns: 1fr; }
    }