/* roulang page: index */
:root {
      --primary: #0A0E27;
      --accent: #00F0FF;
      --highlight: #FF3366;
      --text-bright: #FFFFFF;
      --text-soft: rgba(255, 255, 255, 0.7);
      --text-muted: rgba(255, 255, 255, 0.5);
      --card-bg: rgba(255, 255, 255, 0.04);
      --card-border: rgba(255, 255, 255, 0.08);
      --card-hover-border: #00F0FF;
      --glass-blur: blur(20px);
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --font-numbers: 'DIN Alternate', 'Roboto', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --max-width: 1200px;
      --nav-height: 72px;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--primary);
      color: var(--text-soft);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

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

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      height: var(--nav-height);
      display: flex;
      align-items: center;
      transition: background 0.3s;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 32px;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      letter-spacing: 1px;
      color: var(--text-bright);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo-dot {
      width: 10px;
      height: 10px;
      background: var(--accent);
      border-radius: 50%;
      box-shadow: 0 0 12px var(--accent);
      margin-right: 4px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
      list-style: none;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 1rem;
      color: var(--text-soft);
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent);
    }

    .btn-primary {
      background: linear-gradient(135deg, #FF3366, #FF6B6B);
      color: #FFFFFF;
      border-radius: 50px;
      padding: 12px 32px;
      font-weight: 700;
      font-size: 0.95rem;
      box-shadow: 0 4px 20px rgba(255, 51, 102, 0.4);
      transition: all 0.3s ease;
      letter-spacing: 0.5px;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      box-shadow: 0 6px 28px rgba(255, 51, 102, 0.7);
      transform: scale(1.03);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent);
      color: var(--accent);
      border-radius: 50px;
      padding: 12px 32px;
      font-weight: 600;
      transition: all 0.3s;
    }
    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.1);
      box-shadow: 0 0 18px rgba(0, 240, 255, 0.3);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--text-bright);
      transition: 0.3s;
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      right: 0;
      width: 300px;
      height: 100vh;
      background: rgba(10, 14, 39, 0.96);
      backdrop-filter: blur(25px);
      transform: translateX(100%);
      transition: transform 0.35s ease;
      z-index: 1001;
      display: flex;
      flex-direction: column;
      padding: 32px 28px;
      gap: 28px;
      border-left: 1px solid rgba(255,255,255,0.06);
    }
    .mobile-menu.open {
      transform: translateX(0);
    }
    .mobile-menu a {
      font-size: 1.3rem;
      font-weight: 500;
      color: var(--text-bright);
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      isolation: isolate;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 70% 30%, rgba(0, 240, 255, 0.12) 0%, transparent 65%);
      z-index: 0;
    }
    .hero .container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
      width: 100%;
    }
    .hero-title {
      font-size: clamp(2.8rem, 5vw, 3.8rem);
      font-weight: 800;
      line-height: 1.2;
      color: var(--text-bright);
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }
    .hero-title span {
      background: linear-gradient(135deg, #00F0FF, #FFFFFF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-soft);
      margin-bottom: 36px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }
    .hero-visual {
      display: flex;
      justify-content: center;
    }
    .glass-card {
      background: rgba(255, 255, 255, 0.05);
      backdrop-filter: blur(18px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: var(--radius-md);
      padding: 28px 32px;
      box-shadow: var(--shadow-card);
      color: white;
      animation: float 5s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-12px); }
      100% { transform: translateY(0px); }
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--text-bright);
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 4px;
      background: var(--accent);
      margin-top: 8px;
      border-radius: 2px;
    }
    .section-sub {
      color: var(--text-soft);
      margin-bottom: 48px;
      font-size: 1.1rem;
    }

    /* features 卡片网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 36px 28px;
      backdrop-filter: blur(10px);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      align-items: flex-start;
    }
    .feature-card:hover {
      border-color: var(--card-hover-border);
      box-shadow: 0 0 24px rgba(0,240,255,0.3);
      transform: translateY(-6px);
    }
    .feature-icon {
      width: 48px;
      height: 48px;
      margin-bottom: 24px;
      color: var(--accent);
    }
    .feature-card h3 {
      font-size: 1.5rem;
      font-weight: 600;
      color: #E0E6FF;
      margin-bottom: 12px;
    }

    /* 场景左右交替 */
    .scenario-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
      margin-bottom: 80px;
    }
    .scenario-img {
      aspect-ratio: 16 / 10;
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-md);
      border: 1px solid rgba(255,255,255,0.1);
      box-shadow: var(--shadow-card);
    }

    /* 案例横向滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }
    .case-card {
      flex: 0 0 300px;
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      backdrop-filter: blur(10px);
      scroll-snap-align: start;
    }
    .case-number {
      font-family: var(--font-numbers);
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.06);
      padding: 22px 0;
      cursor: pointer;
    }
    .faq-question {
      font-size: 1.25rem;
      font-weight: 600;
      color: white;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-soft);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 14px;
    }

    /* CTA */
    .cta-band {
      background: radial-gradient(ellipse at center, rgba(0,240,255,0.18) 0%, transparent 70%);
      background-color: #0A0E27;
      text-align: center;
      padding: 90px 20px;
    }
    .pulse {
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(255,51,102,0.7); }
      70% { box-shadow: 0 0 0 18px rgba(255,51,102,0); }
      100% { box-shadow: 0 0 0 0 rgba(255,51,102,0); }
    }

    footer {
      background: #060B1C;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .hero .container { grid-template-columns: 1fr; text-align: center; }
      .hero-visual { order: -1; }
      .features-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .features-grid { grid-template-columns: 1fr; }
      .scenario-row { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }