/* roulang page: index */
:root {
      --color-primary: #C8102E;
      --color-primary-deep: #A00D24;
      --color-dark: #1A1A1A;
      --color-bg: #F5F4F0;
      --color-gold: #D4AF37;
      --color-white: #FFFFFF;
      --color-card: #FFFFFF;
      --color-card-subtle: #FAFAFA;
      --text-heading: #1A1A1A;
      --text-body: #333333;
      --text-muted: #666666;
      --text-on-dark: #FFFFFF;
      --gradient-brand: linear-gradient(135deg, #C8102E 0%, #A00D24 100%);
      --radius-xl: 24px;
      --radius-lg: 20px;
      --radius-pill: 50px;
      --radius-btn: 50px;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-card: 0 8px 24px rgba(0,0,0,0.06);
      --shadow-hover: 0 20px 40px rgba(0,0,0,0.08), 0 5px 10px rgba(0,0,0,0.05);
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      --max-width: 1280px;
      --nav-height: 76px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--color-bg);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input {
      font-family: inherit;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(26, 26, 26, 0.92);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      height: var(--nav-height);
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(255,255,255,0.06);
      transition: background 0.25s;
    }
    .site-header.scrolled {
      background: #1A1A1A;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo a {
      display: flex;
      align-items: baseline;
      gap: 4px;
      font-weight: 800;
      font-size: 1.6rem;
      letter-spacing: -0.3px;
      color: var(--color-white);
    }
    .logo .brand-name {
      color: var(--color-primary);
    }
    .logo .brand-sub {
      font-size: 0.9rem;
      font-weight: 500;
      color: #CCC;
      letter-spacing: 0.3px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-size: 0.95rem;
      font-weight: 500;
      color: #DDD;
      transition: color 0.2s;
      letter-spacing: 0.3px;
    }
    .nav-link:hover {
      color: var(--color-primary);
    }
    .btn-nav {
      background: var(--gradient-brand);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      transition: var(--transition-smooth);
      border: none;
      cursor: pointer;
      display: inline-block;
      box-shadow: 0 4px 10px rgba(200,16,46,0.3);
    }
    .btn-nav:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(200,16,46,0.4);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      width: 28px;
    }
    .hamburger span {
      height: 2px;
      width: 100%;
      background: white;
      border-radius: 4px;
      transition: 0.2s;
    }
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-nav {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        background: #1A1A1A;
        width: 100%;
        padding: 24px 24px;
        gap: 20px;
        opacity: 0;
        transform: translateY(-10px);
        pointer-events: none;
        transition: 0.25s;
      }
      .mobile-nav.is-open {
        opacity: 1;
        transform: translateY(0);
        pointer-events: auto;
        display: flex;
      }
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    .section-tag {
      display: inline-block;
      background: rgba(200,16,46,0.1);
      color: var(--color-primary);
      font-weight: 600;
      font-size: 0.8rem;
      letter-spacing: 0.5px;
      padding: 6px 14px;
      border-radius: 30px;
      margin-bottom: 12px;
    }
    h2 {
      font-size: clamp(1.8rem, 3.5vw, 2.5rem);
      font-weight: 700;
      color: var(--text-heading);
      margin-bottom: 16px;
      letter-spacing: -0.3px;
    }
    .section-desc {
      color: var(--text-muted);
      max-width: 640px;
      margin-bottom: 40px;
      font-size: 1.05rem;
    }
    /* Hero */
    #hero {
      position: relative;
      background: var(--color-dark);
      min-height: 90vh;
      display: flex;
      align-items: center;
      overflow: hidden;
      padding-top: var(--nav-height);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
      flex-wrap: wrap;
    }
    .hero-content {
      flex: 1 1 400px;
      color: white;
    }
    .hero-content h1 {
      font-size: clamp(2.5rem, 5vw, 4rem);
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.02em;
      margin-bottom: 20px;
      color: white;
    }
    .hero-highlight {
      color: var(--color-primary);
    }
    .hero-sub {
      font-size: 1.2rem;
      color: #CCC;
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--gradient-brand);
      color: white;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-size: 1rem;
      transition: var(--transition-smooth);
      border: none;
      cursor: pointer;
      display: inline-block;
      box-shadow: 0 8px 22px rgba(200,16,46,0.4);
    }
    .btn-primary:hover {
      transform: scale(1.05);
      box-shadow: 0 14px 30px rgba(200,16,46,0.55);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.5);
      color: white;
      font-weight: 600;
      padding: 14px 28px;
      border-radius: var(--radius-btn);
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.1);
    }
    .hero-image {
      flex: 1 1 400px;
    }
    .hero-image img {
      border-radius: var(--radius-xl);
      box-shadow: 0 30px 50px rgba(0,0,0,0.7);
    }
    .hero-badges {
      display: flex;
      gap: 20px;
      margin-top: 32px;
      flex-wrap: wrap;
    }
    .badge-item {
      background: rgba(255,255,255,0.12);
      backdrop-filter: blur(8px);
      padding: 10px 18px;
      border-radius: 40px;
      color: white;
      display: flex;
      align-items: center;
      gap: 6px;
      font-weight: 600;
      font-size: 0.9rem;
    }
    .badge-number {
      color: var(--color-gold);
      font-weight: 800;
      font-size: 1.35rem;
      margin-right: 4px;
    }
    /* 卡片通用 */
    .card {
      background: var(--color-card);
      border-radius: var(--radius-xl);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
      height: 100%;
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    @media (max-width: 768px) {
      .grid-3 {
        grid-template-columns: 1fr;
      }
    }
    .feature-icon {
      font-size: 2.5rem;
      margin-bottom: 20px;
      color: var(--color-primary);
    }
    .card h3 {
      font-size: 1.4rem;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .progress-red {
      height: 4px;
      background: #EEE;
      border-radius: 4px;
      margin-top: 20px;
    }
    .progress-red span {
      display: block;
      height: 100%;
      background: var(--color-primary);
      width: 75%;
      border-radius: 4px;
    }
    .horizontal-card {
      display: flex;
      align-items: center;
      gap: 32px;
      background: var(--color-card);
      border-radius: var(--radius-xl);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      margin-bottom: 36px;
    }
    .horizontal-card.reverse {
      flex-direction: row-reverse;
    }
    .card-img {
      flex: 1 1 45%;
    }
    .card-img img {
      width: 100%;
      height: 300px;
      object-fit: cover;
      border-radius: var(--radius-lg);
    }
    .card-text {
      flex: 1 1 50%;
      padding: 32px;
    }
    .tag {
      background: var(--color-primary);
      color: white;
      font-size: 0.7rem;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 12px;
    }
    .scenario-card {
      border-radius: var(--radius-xl);
      height: 320px;
      background-size: cover;
      background-position: center;
      position: relative;
      overflow: hidden;
      display: flex;
      align-items: flex-end;
      color: white;
    }
    .scenario-overlay {
      background: linear-gradient(0deg, rgba(0,0,0,0.75) 0%, transparent 70%);
      padding: 32px;
      width: 100%;
      transition: 0.3s;
    }
    .case-badge-group {
      display: flex;
      gap: 32px;
      flex-wrap: wrap;
      margin-bottom: 24px;
    }
    .gold-number {
      font-size: 2.4rem;
      font-weight: 800;
      color: var(--color-gold);
    }
    .faq-item {
      border-bottom: 1px solid #DDD;
      padding: 18px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      font-size: 1.1rem;
    }
    .faq-answer {
      color: var(--text-muted);
      margin-top: 8px;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    #cta {
      background: var(--gradient-brand);
      text-align: center;
      color: white;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 768px) {
      .horizontal-card, .horizontal-card.reverse {
        flex-direction: column;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-grid {
        flex-direction: column;
      }
    }