/* roulang page: index */
:root {
      --primary: #F04E23;
      --primary-dark: #E03C15;
      --secondary: #8A2BE2;
      --dark-bg: #1E1E24;
      --dark-surface: #2A2A35;
      --text-light: #F5F5F5;
      --text-muted: #CCCCCC;
      --text-dark: #333333;
      --text-body: #444444;
      --bg-light: #F9F9FB;
      --border-color: #E0E0E0;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 4px 16px rgba(0,0,0,0.06);
      --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
      --shadow-xl: 0 12px 32px rgba(0,0,0,0.16);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-xl: 20px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-mono: "Inter", "Roboto", sans-serif;
      --transition: all 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: #ffffff;
      color: var(--text-body);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, .h1, .h2, .h3, .h4 {
      font-weight: 700;
      letter-spacing: -0.3px;
    }

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

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

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 导航 */
    .navbar {
      background: rgba(30,30,36,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      transition: var(--transition);
      padding: 12px 0;
    }
    .navbar.scrolled {
      background: #1E1E24;
      box-shadow: 0 2px 16px rgba(0,0,0,0.3);
    }
    .navbar-brand {
      font-weight: 700;
      font-size: 1.6rem;
      color: #fff !important;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, #F04E23, #E03C15);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      position: relative;
    }
    .logo-icon::before {
      content: "⚡";
      filter: drop-shadow(0 0 4px rgba(255,255,255,0.6));
    }
    .nav-link {
      color: #CCC !important;
      font-size: 0.9rem;
      font-weight: 500;
      padding: 8px 16px !important;
      letter-spacing: 0.3px;
      position: relative;
      transition: var(--transition);
    }
    .nav-link:hover, .nav-link.active {
      color: #F04E23 !important;
    }
    .badge-nav {
      position: absolute;
      top: -2px;
      right: 4px;
      background: #8A2BE2;
      color: white;
      font-size: 0.65rem;
      padding: 2px 6px;
      border-radius: 10px;
      line-height: 1;
      font-weight: 600;
    }
    .btn-nav-cta {
      background: linear-gradient(135deg, #F04E23, #E03C15);
      border: none;
      border-radius: 30px;
      padding: 8px 20px;
      font-weight: 600;
      color: white;
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.9rem;
      transition: var(--transition);
      white-space: nowrap;
    }
    .btn-nav-cta:hover {
      transform: scale(1.03);
      box-shadow: 0 4px 12px rgba(240,78,35,0.4);
      color: white;
    }
    .countdown-timer {
      background: rgba(0,0,0,0.35);
      padding: 2px 8px;
      border-radius: 4px;
      font-family: var(--font-mono);
      font-size: 0.8rem;
      letter-spacing: 1px;
    }
    .navbar-toggler {
      border: none;
      color: white;
      font-size: 1.5rem;
    }
    .navbar-toggler:focus {
      box-shadow: none;
    }
    @media (max-width: 992px) {
      .navbar-collapse {
        background: rgba(30,30,36,0.95);
        backdrop-filter: blur(16px);
        padding: 20px;
        border-radius: 0 0 16px 16px;
        margin-top: 10px;
      }
      .nav-link {
        padding: 12px 16px !important;
      }
    }

    /* Hero */
    .hero-section {
      min-height: 100vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      color: white;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(30,30,36,0.85) 0%, rgba(240,78,35,0.4) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      width: 100%;
    }
    .hero-title {
      font-size: 3.5rem;
      font-weight: 800;
      text-shadow: 0 4px 16px rgba(0,0,0,0.5);
      letter-spacing: -1px;
      line-height: 1.2;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: #DDD;
      text-shadow: 0 2px 8px rgba(0,0,0,0.5);
      margin: 20px 0 30px;
    }
    .btn-primary-hero {
      background: linear-gradient(135deg, #F04E23, #E03C15);
      border: none;
      padding: 14px 32px;
      border-radius: 30px;
      font-weight: 700;
      color: white;
      transition: var(--transition);
      margin-right: 15px;
    }
    .btn-primary-hero:hover {
      transform: scale(1.05);
      box-shadow: 0 8px 20px rgba(240,78,35,0.5);
      color: white;
    }
    .btn-outline-hero {
      border: 1px solid rgba(255,255,255,0.8);
      background: transparent;
      color: white;
      padding: 14px 32px;
      border-radius: 30px;
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline-hero:hover {
      background: rgba(255,255,255,0.2);
      color: white;
    }
    .stat-badge {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(4px);
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: 30px;
      padding: 12px 20px;
      color: white;
      display: inline-flex;
      align-items: baseline;
      gap: 6px;
      margin-right: 15px;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 1.8rem;
      line-height: 1;
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.4rem;
      }
      .hero-sub {
        font-size: 1rem;
      }
      .stat-badge {
        margin-bottom: 10px;
      }
    }

    /* 区块标题 */
    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      margin-bottom: 15px;
      color: #1E1E24;
    }
    .section-sub {
      color: #666;
      max-width: 600px;
    }

    /* 核心优势 非对称栅格 */
    .feature-large-card {
      background: #F9F9FB;
      border-radius: 20px;
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      height: 100%;
    }
    .feature-large-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
    }
    .feature-small-card {
      background: white;
      border-radius: 16px;
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      margin-bottom: 24px;
    }
    .feature-small-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .feature-title {
      font-weight: 700;
      color: #F04E23;
      font-size: 1.4rem;
      margin-bottom: 12px;
    }

    /* 场景卡片 */
    .scene-card {
      background: white;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: var(--shadow-md);
      transition: var(--transition);
    }
    .scene-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
    }
    .scene-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }

    /* 案例卡片 */
    .case-card {
      border: 1px solid #E0E0E0;
      border-radius: 16px;
      padding: 24px;
      background: white;
      transition: var(--transition);
    }
    .case-card:hover {
      border-color: #F04E23;
      box-shadow: 0 0 0 3px rgba(240,78,35,0.1);
    }

    /* 价格卡片 */
    .pricing-card {
      border-radius: 24px;
      padding: 32px;
      background: white;
      box-shadow: var(--shadow-md);
      transition: var(--transition);
      border: 1px solid transparent;
    }
    .pricing-card.popular {
      background: linear-gradient(145deg, #1E1E24, #2A2A35);
      color: white;
      transform: scale(1.03);
      border: 2px solid #F04E23;
    }
    .price-number {
      font-family: var(--font-mono);
      font-size: 3rem;
      font-weight: 800;
    }

    /* FAQ */
    .accordion-button {
      font-weight: 600;
      border: 1px solid #E0E0E0;
      border-radius: 12px !important;
      margin-bottom: 8px;
      background: white;
      box-shadow: none;
    }
    .accordion-button:not(.collapsed) {
      background: #F9F9FB;
      border-color: #F04E23;
      color: #1E1E24;
    }
    .accordion-button::after {
      content: "+";
      background-image: none;
      font-weight: bold;
      font-size: 1.4rem;
      color: #F04E23;
      width: auto;
      height: auto;
    }
    .accordion-button:not(.collapsed)::after {
      content: "−";
    }

    /* CTA底部 */
    .cta-bottom {
      background: linear-gradient(135deg, #1E1E24 0%, #F04E23 100%);
      border-radius: 32px;
      padding: 70px 40px;
    }
    .form-control {
      border-radius: 40px;
      padding: 14px 20px;
      border: 1px solid #ccc;
    }
    .form-control:focus {
      border-color: #F04E23;
      box-shadow: 0 0 0 3px rgba(240,78,35,0.2);
    }

    .footer a {
      color: #aaa;
    }
    .footer a:hover {
      color: #F04E23;
    }

    section {
      padding: 90px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }