/* roulang page: index */
:root {
      --primary-deep: #4A0E5C;
      --primary-royal: #5B1A6E;
      --primary-mid: #7B2D8E;
      --accent-warm: #E07A3D;
      --accent-deep: #C84B31;
      --bg-light: #F9F7FA;
      --bg-card: #FFFFFF;
      --bg-dark: #1E0A26;
      --border-subtle: #EDE4F2;
      --text-main: #1A1A1A;
      --text-secondary: #4A4A5A;
      --text-on-dark: #FFFFFF;
      --text-muted-on-dark: #D4C5E0;
      --shadow-sm: 0 8px 30px rgba(90, 26, 110, 0.08);
      --shadow-hover: 0 16px 40px rgba(90, 26, 110, 0.16);
      --radius-card: 20px;
      --radius-inner: 14px;
      --radius-button: 12px;
      --radius-cta: 14px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.7;
      font-weight: 400;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

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

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

    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
    }

    /* 导航栏 */
    .main-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(90, 26, 110, 0.1);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary-royal);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.3px;
    }
    .logo-icon {
      width: 12px;
      height: 12px;
      background: var(--accent-warm);
      border-radius: 2px;
      transform: rotate(45deg);
      box-shadow: 0 0 8px rgba(224,122,61,0.6);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      color: var(--text-secondary);
      font-weight: 500;
      position: relative;
      padding: 6px 0;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-royal);
      transition: width 0.25s ease;
    }

    .nav-links a:hover {
      color: var(--primary-royal);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .btn-primary-sm {
      background: linear-gradient(135deg, var(--primary-royal), var(--primary-mid));
      color: white;
      padding: 10px 22px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.9rem;
      transition: all 0.3s;
      box-shadow: 0 4px 12px rgba(91,26,110,0.3);
    }
    .btn-primary-sm:hover {
      background: linear-gradient(135deg, #7B2D8E, #C84B31);
      box-shadow: 0 8px 20px rgba(91,26,110,0.5);
      transform: translateY(-1px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary-royal);
      border-radius: 4px;
    }

    /* Hero */
    .hero {
      background: linear-gradient(160deg, #1E0A26 0%, #3D1255 50%, #1E0A26 100%);
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 20% 40%, rgba(123,45,142,0.25) 0%, transparent 60%);
      pointer-events: none;
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1 1 400px;
    }
    .hero-text h1 {
      font-weight: 700;
      font-size: clamp(2.5rem, 5vw, 4rem);
      letter-spacing: -0.02em;
      color: white;
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero-text p {
      color: var(--text-muted-on-dark);
      font-size: 1.2rem;
      margin-bottom: 40px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-main {
      background: linear-gradient(135deg, var(--primary-royal), var(--primary-mid));
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 600;
      transition: 0.3s;
    }
    .btn-main:hover {
      background: linear-gradient(135deg, #7B2D8E, #C84B31);
      box-shadow: 0 8px 24px rgba(91,26,110,0.5);
      transform: translateY(-2px);
    }
    .btn-outline-light {
      border: 2px solid rgba(255,255,255,0.5);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 600;
      transition: 0.3s;
    }
    .btn-outline-light:hover {
      background: rgba(255,255,255,0.1);
      border-color: white;
    }

    .hero-visual {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
      position: relative;
    }
    .card-stack {
      position: relative;
      width: 280px;
      height: 360px;
    }
    .stack-card {
      width: 100%;
      height: 100%;
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(8px);
      border-radius: 28px;
      border: 1px solid rgba(255,255,255,0.2);
      position: absolute;
      transition: 0.3s;
      background-size: cover;
      background-position: center;
    }
    .stack-card:nth-child(1) { top: 0; left: 0; background-image: url('/assets/images/coverpic/cover-1.webp'); }
    .stack-card:nth-child(2) { top: 20px; left: 30px; background-image: url('/assets/images/coverpic/cover-2.webp'); }
    .stack-card:nth-child(3) { top: 40px; left: 60px; background-image: url('/assets/images/backpic/back-1.webp'); }

    .hero-badges {
      display: flex;
      gap: 32px;
      margin-top: 32px;
      flex-wrap: wrap;
    }
    .badge-item {
      display: flex;
      align-items: baseline;
      gap: 6px;
      color: white;
    }
    .badge-number {
      font-family: var(--font-number);
      font-weight: 800;
      font-size: 2rem;
      background: linear-gradient(135deg, #E07A3D, #FFB347);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-weight: 600;
      font-size: 2rem;
      margin-bottom: 56px;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      bottom: -12px;
      left: 0;
      width: 40px;
      height: 3px;
      background: linear-gradient(to right, var(--primary-royal), var(--accent-warm));
    }

    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 32px;
    }
    .feature-card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-subtle);
      transition: 0.3s;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 2rem;
      margin-bottom: 16px;
      color: var(--primary-royal);
    }

    /* 产品图文 */
    .product-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .product-row.reverse {
      flex-direction: row-reverse;
    }
    .product-img {
      flex: 1;
      background: #F3E8F8;
      border-radius: 24px;
      height: 300px;
      background-size: cover;
      background-position: center;
      border: 2px solid var(--border-subtle);
    }

    /* 场景 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    .scenario-card {
      height: 320px;
      border-radius: var(--radius-card);
      overflow: hidden;
      position: relative;
      background-size: cover;
      background-position: center;
    }
    .scenario-overlay {
      position: absolute;
      bottom: 0;
      width: 100%;
      background: rgba(30,10,38,0.8);
      color: white;
      padding: 24px;
    }

    /* 案例 */
    .cases-scroll {
      display: flex;
      gap: 32px;
      overflow-x: auto;
      padding-bottom: 16px;
    }
    .case-card {
      min-width: 280px;
      background: white;
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-sm);
    }
    .case-big-number {
      font-family: var(--font-number);
      font-weight: 800;
      font-size: 3rem;
      background: linear-gradient(135deg, #5B1A6E, #C84B31);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* 价格 */
    .pricing-grid {
      display: flex;
      gap: 24px;
      align-items: flex-start;
      justify-content: center;
      flex-wrap: wrap;
    }
    .pricing-card {
      background: white;
      border-radius: 24px;
      padding: 40px 24px;
      flex: 1;
      min-width: 260px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-subtle);
    }
    .pricing-card.featured {
      border: 2px solid var(--primary-royal);
      transform: scale(1.03);
      box-shadow: var(--shadow-hover);
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .faq-item {
      background: white;
      border-radius: 14px;
      padding: 16px 20px;
      cursor: pointer;
      border: 1px solid var(--border-subtle);
    }

    /* CTA */
    .cta-banner {
      background: linear-gradient(135deg, #4A0E5C, #7B2D8E);
      padding: 80px 0;
      text-align: center;
      color: white;
    }

    /* footer */
    .footer {
      background: var(--bg-dark);
      color: #D4C5E0;
      padding: 60px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .features-grid { grid-template-columns: 1fr; }
      .product-row { flex-direction: column; }
      .scenarios-grid { grid-template-columns: 1fr; }
      .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }