/* roulang page: index */
:root {
      --primary-bg: #0A0E27;
      --card-bg: rgba(20, 24, 50, 0.6);
      --accent-cyan: #00F0FF;
      --accent-purple: #7B61FF;
      --text-light: rgba(255, 255, 255, 0.9);
      --text-muted: rgba(255, 255, 255, 0.6);
      --border-glass: rgba(0, 240, 255, 0.15);
      --border-glow: rgba(0, 240, 255, 0.4);
      --radius-card: 20px;
      --radius-btn: 50px;
      --radius-input: 12px;
      --shadow-glow: 0 0 20px rgba(0, 240, 255, 0.25);
      --font-title: 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'Inter', 'PingFang SC', sans-serif;
    }

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

    body {
      background-color: var(--primary-bg);
      color: var(--text-light);
      font-family: var(--font-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-title);
      font-weight: 700;
      letter-spacing: -0.02em;
    }

    h2 {
      font-size: 2.6rem;
      margin-bottom: 1.2rem;
      background: linear-gradient(135deg, #fff, #d0e0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    h3 {
      font-size: 1.6rem;
      margin-bottom: 0.8rem;
    }

    p {
      color: var(--text-muted);
      font-size: 1rem;
      line-height: 1.7;
    }

    .section {
      padding: 90px 0;
      position: relative;
    }

    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-card);
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5), inset 0 0 0 1px rgba(0, 240, 255, 0.08);
      transition: all 0.3s ease;
    }

    .glass-card:hover {
      border-color: var(--accent-cyan);
      box-shadow: 0 0 28px rgba(0, 240, 255, 0.3), 0 12px 30px rgba(0,0,0,0.6);
      transform: translateY(-6px);
    }

    .btn-primary {
      background: transparent;
      border: 2px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 14px 34px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      letter-spacing: 0.5px;
      transition: all 0.3s;
      display: inline-block;
      text-decoration: none;
      cursor: pointer;
    }

    .btn-primary:hover {
      background: var(--accent-cyan);
      color: #0A0E27;
      box-shadow: 0 0 30px var(--accent-cyan);
      border-color: var(--accent-cyan);
    }

    .btn-glass {
      background: rgba(20, 24, 50, 0.4);
      border: 1px solid rgba(255,255,255,0.2);
      color: white;
      backdrop-filter: blur(8px);
      padding: 14px 34px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      transition: all 0.3s;
      display: inline-block;
      text-decoration: none;
    }

    .btn-glass:hover {
      background: rgba(255,255,255,0.15);
      border-color: rgba(255,255,255,0.5);
      color: white;
    }

    /* 浮动导航 */
    .floating-nav {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      width: 90%;
      max-width: 720px;
      background: rgba(10, 14, 39, 0.75);
      backdrop-filter: blur(22px);
      -webkit-backdrop-filter: blur(22px);
      border: 1px solid rgba(0,240,255,0.25);
      border-radius: 40px;
      padding: 10px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      z-index: 9999;
      box-shadow: 0 10px 30px rgba(0,0,0,0.7);
    }

    .nav-logo {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 1.4rem;
      background: linear-gradient(to right, #00F0FF, #7B61FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 0.5px;
    }

    .nav-links {
      display: flex;
      gap: 28px;
      list-style: none;
    }

    .nav-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
    }

    .nav-links a:hover {
      color: var(--accent-cyan);
    }

    .nav-cta {
      background: transparent;
      border: 1.5px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 8px 20px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.9rem;
      transition: all 0.3s;
      text-decoration: none;
      white-space: nowrap;
    }

    .nav-cta:hover {
      background: var(--accent-cyan);
      color: #0A0E27;
      box-shadow: 0 0 20px var(--accent-cyan);
    }

    /* 移动端底部导航 */
    @media (max-width: 768px) {
      .floating-nav {
        top: auto;
        bottom: 16px;
        width: 92%;
        max-width: 100%;
        border-radius: 36px;
        padding: 10px 20px;
      }
      .nav-links {
        display: none;
      }
      .nav-logo {
        font-size: 1.2rem;
      }
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background: radial-gradient(circle at 30% 40%, #1a1f40 0%, #0A0E27 70%);
      overflow: hidden;
    }

    .hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.35;
      mix-blend-mode: screen;
      animation: slowRotate 40s linear infinite;
    }

    @keyframes slowRotate {
      from { transform: scale(1.1) rotate(0deg); }
      to { transform: scale(1.1) rotate(360deg); }
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 600px;
    }

    .hero h1 {
      font-size: 3.6rem;
      background: linear-gradient(135deg, #fff, #b0e0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1.5rem;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 2.5rem;
    }

    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      color: var(--accent-cyan);
      font-size: 2rem;
      animation: bounce 2s infinite;
    }

    @keyframes bounce {
      0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
      40% { transform: translateX(-50%) translateY(-12px); }
      60% { transform: translateX(-50%) translateY(-5px); }
    }

    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
      margin-top: 2.5rem;
    }

    .pain-card {
      padding: 2rem;
      text-align: left;
    }

    .pain-icon {
      font-size: 2.2rem;
      color: #FF6B7A;
      opacity: 0.9;
      margin-bottom: 1rem;
    }

    .solution-list {
      display: flex;
      flex-direction: column;
      gap: 2.5rem;
      margin-top: 2rem;
    }

    .solution-item {
      display: flex;
      gap: 1.5rem;
      align-items: flex-start;
    }

    .solution-icon {
      font-size: 2rem;
      color: var(--accent-cyan);
      background: rgba(0,240,255,0.1);
      padding: 12px;
      border-radius: 16px;
    }

    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      margin-top: 2.5rem;
    }

    .adv-card {
      padding: 2rem 1.5rem;
      text-align: center;
    }

    .adv-number {
      font-size: 2.6rem;
      font-weight: 800;
      color: var(--accent-cyan);
      text-shadow: 0 0 15px var(--accent-cyan);
      margin-bottom: 0.5rem;
      font-family: 'Inter', monospace;
    }

    .testimonial-stats {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      margin-bottom: 3rem;
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent-cyan);
      text-shadow: 0 0 20px var(--accent-cyan);
    }

    .testimonial-cards {
      display: flex;
      gap: 2rem;
      overflow-x: auto;
      padding-bottom: 1rem;
      scroll-snap-type: x mandatory;
    }

    .testimonial-card {
      min-width: 300px;
      flex: 1;
      padding: 2rem;
      border-left: 4px solid var(--accent-purple);
      scroll-snap-align: start;
    }

    .cta-form {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
      margin-top: 2rem;
    }

    .cta-input {
      background: rgba(255,255,255,0.08);
      border: 1px solid rgba(0,240,255,0.3);
      border-radius: 30px;
      padding: 14px 22px;
      color: white;
      flex: 1;
      min-width: 180px;
      transition: 0.2s;
    }

    .cta-input:focus {
      border-color: var(--accent-cyan);
      box-shadow: 0 0 15px rgba(0,240,255,0.4);
      outline: none;
    }

    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding: 1.2rem 0;
      cursor: pointer;
    }

    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 1.1rem;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: rgba(255,255,255,0.75);
      margin-top: 0.5rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
      color: rgba(255,255,255,0.6);
    }

    @media (max-width: 1024px) {
      .advantages-grid { grid-template-columns: repeat(2, 1fr); }
      .pain-grid { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      h2 { font-size: 2rem; }
      .hero h1 { font-size: 2.4rem; }
      .advantages-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .cta-form { flex-direction: column; }
      .testimonial-cards { flex-direction: column; }
      .section { padding: 60px 0; }
    }