/* roulang page: index */
:root {
      --primary-orange: #E8453C;
      --deep-blue: #0F1923;
      --victory-gold: #F5A623;
      --charcoal: #1E2A38;
      --mist-white: #F4F6F9;
      --pure-white: #FFFFFF;
      --text-dark: #3A4A5C;
      --border-light: rgba(255,255,255,0.1);
      --shadow-card: 0 4px 20px rgba(15,25,35,0.08);
      --shadow-hover: 0 12px 32px rgba(232,69,60,0.12);
      --radius-lg: 16px;
      --radius-pill: 50px;
      --transition-smooth: 0.3s ease;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--mist-white);
      color: var(--text-dark);
      line-height: 1.6;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    
    h1, h2, h3, h4, h5, h6 {
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 0.8rem;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    
    /* 导航栏 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: transparent;
      backdrop-filter: blur(0px);
      z-index: 1000;
      transition: background 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s;
      display: flex;
      align-items: center;
      padding: 0 2rem;
    }
    
    .navbar-custom.scrolled {
      background: rgba(15, 25, 35, 0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    }
    
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary-orange);
      letter-spacing: 1px;
      white-space: nowrap;
    }
    
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
      margin-left: auto;
    }
    
    .nav-links a {
      color: #ffffff;
      font-size: 14px;
      font-weight: 500;
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    
    .nav-links a:hover {
      color: var(--victory-gold);
    }
    
    .nav-links a.active {
      color: var(--victory-gold);
      border-bottom: 2px solid var(--victory-gold);
    }
    
    .hamburger {
      display: none;
      font-size: 24px;
      color: var(--victory-gold);
      cursor: pointer;
    }
    
    /* Hero */
    .hero-section {
      min-height: 100vh;
      background: radial-gradient(circle at 30% 40%, rgba(232,69,60,0.15) 0%, #0F1923 70%);
      display: flex;
      align-items: center;
      color: white;
      padding-top: 72px;
      position: relative;
      overflow: hidden;
    }
    
    .hero-content {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 3rem;
    }
    
    .hero-left {
      flex: 1 1 50%;
    }
    
    .hero-right {
      flex: 1 1 40%;
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
      min-height: 400px;
      background: url('/assets/images/backpic/back-1.webp') no-repeat center/cover;
      border-radius: var(--radius-lg);
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      border: 1px solid rgba(255,255,255,0.15);
    }
    
    .hero-title {
      font-size: 48px;
      line-height: 1.2;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, #E8453C, #F5A623);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1.5rem;
      font-weight: 800;
    }
    
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 2rem;
      max-width: 500px;
    }
    
    .btn-primary-custom {
      background: var(--primary-orange);
      border: none;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      transition: all 0.3s ease;
      display: inline-block;
      text-align: center;
    }
    
    .btn-primary-custom:hover {
      background: linear-gradient(135deg, #E8453C, #F5A623);
      transform: scale(1.05);
      color: white;
      box-shadow: 0 8px 20px rgba(232,69,60,0.4);
    }
    
    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--primary-orange);
      color: var(--primary-orange);
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      transition: all 0.3s ease;
      display: inline-block;
    }
    
    .btn-outline-custom:hover {
      background: var(--primary-orange);
      color: white;
      border-color: var(--primary-orange);
    }
    
    .floating-badge {
      position: absolute;
      background: rgba(15,25,35,0.85);
      backdrop-filter: blur(8px);
      padding: 12px 20px;
      border-radius: 40px;
      color: var(--victory-gold);
      font-weight: 700;
      font-size: 18px;
      border: 1px solid rgba(245,166,35,0.3);
      animation: float 4s ease-in-out infinite;
      box-shadow: 0 8px 18px rgba(0,0,0,0.3);
    }
    
    .badge-1 { top: 20px; right: -10px; animation-delay: 0s; }
    .badge-2 { bottom: 60px; left: -10px; animation-delay: 1.5s; }
    .badge-3 { top: 50%; left: 60%; animation-delay: 0.7s; }
    
    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-12px); }
      100% { transform: translateY(0px); }
    }
    
    /* 通用区块 */
    .section-padding {
      padding: 100px 0;
    }
    
    .section-title {
      font-size: 36px;
      color: var(--deep-blue);
      text-align: center;
      margin-bottom: 1rem;
      position: relative;
      font-weight: 700;
    }
    
    .section-title::after {
      content: '';
      display: block;
      width: 40px;
      height: 3px;
      background: var(--victory-gold);
      margin: 12px auto 0;
      border-radius: 2px;
    }
    
    .card-custom {
      background: var(--pure-white);
      border-radius: var(--radius-lg);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
      height: 100%;
      border: none;
    }
    
    .card-custom:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    
    .icon-placeholder {
      width: 64px;
      height: 64px;
      background: rgba(232,69,60,0.1);
      border-radius: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 32px;
      color: var(--primary-orange);
      margin-bottom: 1.5rem;
    }
    
    .data-badge {
      background: var(--victory-gold);
      color: var(--deep-blue);
      font-weight: 800;
      font-size: 20px;
      padding: 6px 14px;
      border-radius: 8px;
      display: inline-block;
      margin-top: 1rem;
    }
    
    .scenario-card {
      height: 360px;
      border-radius: var(--radius-lg);
      background-size: cover;
      background-position: center;
      position: relative;
      overflow: hidden;
      transition: all 0.3s ease;
      display: flex;
      align-items: flex-end;
      padding: 2rem;
    }
    
    .scenario-card::before {
      content: '';
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background: linear-gradient(0deg, rgba(15,25,35,0.85) 10%, transparent 60%);
      transition: opacity 0.3s;
    }
    
    .scenario-card:hover::before {
      background: linear-gradient(0deg, rgba(15,25,35,0.6) 10%, transparent 60%);
    }
    
    .scenario-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 20px 30px rgba(0,0,0,0.4);
    }
    
    .scenario-title {
      position: relative;
      color: white;
      font-size: 28px;
      font-weight: 700;
      z-index: 2;
    }
    
    .pricing-card {
      background: var(--pure-white);
      border-radius: var(--radius-lg);
      padding: 2.5rem 2rem;
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: var(--transition-smooth);
      border: 2px solid transparent;
    }
    
    .pricing-card.recommended {
      border-color: var(--primary-orange);
      box-shadow: 0 12px 30px rgba(232,69,60,0.2);
      transform: scale(1.02);
    }
    
    .badge-popular {
      background: var(--primary-orange);
      color: white;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 14px;
      display: inline-block;
      margin-bottom: 1rem;
    }
    
    .price-number {
      font-size: 42px;
      font-weight: 800;
      color: var(--deep-blue);
    }
    
    .accordion-button:not(.collapsed) {
      background-color: var(--mist-white);
      color: var(--deep-blue);
      font-weight: 700;
      box-shadow: none;
    }
    
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--primary-orange);
    }
    
    .cta-section {
      background: var(--deep-blue);
      background-image: radial-gradient(circle at 50% 50%, rgba(232,69,60,0.3) 0%, transparent 60%);
    }
    
    .footer-custom {
      background: #0B1520;
      color: rgba(255,255,255,0.7);
    }
    
    .footer-custom a:hover {
      color: var(--victory-gold);
    }
    
    @media (max-width: 992px) {
      .hero-title { font-size: 40px; }
      .section-padding { padding: 70px 0; }
    }
    
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .mobile-menu {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(15,25,35,0.98);
        backdrop-filter: blur(15px);
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        z-index: 999;
      }
      .mobile-menu.active { display: flex; }
      .hero-title { font-size: 32px; }
      .hero-content { flex-direction: column; }
      .hero-right { min-height: 300px; width: 100%; }
    }
    
    @media (max-width: 576px) {
      .hero-title { font-size: 30px; }
      .pricing-card.recommended { transform: none; }
    }