/* roulang page: index */
:root {
      --primary-purple: #7B2FF7;
      --primary-orange: #FF6B35;
      --accent-cyan: #00E5FF;
      --dark-bg: #0F0F1A;
      --card-bg: #F5F3F0;
      --white: #FFFFFF;
      --text-dark: #1A1A2E;
      --text-soft: #5A5A72;
      --border-light: rgba(123, 47, 247, 0.15);
      --shadow-card: 0 8px 28px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 20px 40px rgba(123, 47, 247, 0.18);
      --radius-lg: 28px;
      --radius-xl: 36px;
      --radius-full: 50px;
      --transition-smooth: all 0.3s cubic-bezier(0.2, 0.9, 0.4, 1);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--white);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 16px;
      overflow-x: hidden;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      transition: var(--transition-smooth);
      backdrop-filter: blur(20px);
      background: rgba(15, 15, 26, 0.75);
      box-shadow: 0 4px 24px rgba(0,0,0,0.1);
    }
    .nav.scrolled {
      background: rgba(15, 15, 26, 0.9);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      font-size: 1.7rem;
      background: linear-gradient(135deg, #7B2FF7, #FF6B35);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: -0.3px;
    }
    .logo-icon {
      font-size: 2rem;
      filter: drop-shadow(0 4px 8px rgba(123,47,247,0.4));
    }
    .nav-links {
      display: flex;
      gap: 2.5rem;
      font-weight: 500;
      color: rgba(255,255,255,0.85);
    }
    .nav-links a {
      transition: color 0.2s;
      font-size: 1rem;
    }
    .nav-links a:hover {
      color: #FF6B35;
    }
    .nav-download-btn {
      background: linear-gradient(135deg, #7B2FF7, #FF6B35);
      border: none;
      color: white;
      font-weight: 700;
      padding: 12px 28px;
      border-radius: 50px;
      display: flex;
      align-items: center;
      gap: 8px;
      cursor: pointer;
      transition: var(--transition-smooth);
      box-shadow: 0 8px 20px rgba(123,47,247,0.3);
      font-size: 1rem;
    }
    .nav-download-btn:hover {
      transform: scale(1.04);
      box-shadow: 0 12px 28px rgba(255,107,53,0.5);
    }
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 12px;
      left: 50%;
      transform: translateX(-50%);
      background: rgba(15,15,26,0.9);
      backdrop-filter: blur(28px);
      border-radius: 60px;
      padding: 8px 18px;
      z-index: 110;
      box-shadow: 0 10px 30px rgba(0,0,0,0.4);
      border: 1px solid rgba(123,47,247,0.3);
    }
    .mobile-nav-items {
      display: flex;
      gap: 18px;
      align-items: center;
      color: white;
    }
    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 0.7rem;
      font-weight: 500;
      opacity: 0.8;
    }
    .mobile-nav-item i {
      font-size: 1.3rem;
      margin-bottom: 2px;
    }
    .mobile-cta {
      background: linear-gradient(135deg, #7B2FF7, #FF6B35);
      border-radius: 40px;
      padding: 12px 20px;
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 6px;
      box-shadow: 0 0 18px #FF6B35;
      margin-left: 5px;
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, #1a1030 0%, #0F0F1A 85%);
      position: relative;
      overflow: hidden;
    }
    .hero-particles {
      position: absolute;
      inset: 0;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 400 400"><circle cx="30" cy="80" r="2" fill="%237B2FF7" opacity="0.7"/><circle cx="170" cy="250" r="3" fill="%23FF6B35" opacity="0.6"/><circle cx="320" cy="120" r="2.5" fill="%2300E5FF" opacity="0.5"/></svg>');
      opacity: 0.25;
      pointer-events: none;
    }
    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      width: 100%;
      position: relative;
      z-index: 2;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 500px;
      color: white;
    }
    .hero h1 {
      font-size: clamp(2.8rem, 6vw, 4rem);
      font-weight: 800;
      background: linear-gradient(to right, #7B2FF7, #00E5FF, #FF6B35);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      line-height: 1.2;
      margin-bottom: 1.2rem;
      letter-spacing: -0.5px;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 2.2rem;
      max-width: 500px;
    }
    .cta-group {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #7B2FF7, #FF6B35);
      border: none;
      color: white;
      font-weight: 700;
      padding: 16px 36px;
      border-radius: 50px;
      font-size: 1.1rem;
      cursor: pointer;
      transition: var(--transition-smooth);
      box-shadow: 0 10px 24px rgba(123,47,247,0.4);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-primary:hover {
      transform: scale(1.04);
      box-shadow: 0 16px 32px rgba(255,107,53,0.55);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid #7B2FF7;
      color: white;
      font-weight: 600;
      padding: 16px 36px;
      border-radius: 50px;
      cursor: pointer;
      transition: var(--transition-smooth);
    }
    .btn-outline:hover {
      background: rgba(123,47,247,0.2);
      border-color: #FF6B35;
    }
    .hero-mockup {
      flex: 0 0 260px;
      background: url('/assets/images/coverpic/cover-1.webp') center/cover no-repeat;
      border-radius: 40px;
      height: 420px;
      width: 240px;
      box-shadow: 0 30px 50px rgba(123,47,247,0.5);
      border: 2px solid rgba(255,255,255,0.2);
      margin-right: 20px;
    }
    /* 通用板块 */
    .section {
      padding: 100px 0;
    }
    .section h2 {
      font-size: 2.5rem;
      font-weight: 700;
      color: #0F0F1A;
      margin-bottom: 1rem;
      text-align: center;
    }
    .section-sub {
      text-align: center;
      color: #5A5A72;
      margin-bottom: 3.5rem;
      font-size: 1.1rem;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 28px;
    }
    .card {
      background: #F5F3F0;
      border-radius: 28px;
      padding: 32px 24px;
      transition: var(--transition-smooth);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
      text-align: center;
    }
    .card:hover {
      transform: translateY(-8px);
      box-shadow: 0 20px 40px rgba(123,47,247,0.15);
    }
    .card-icon {
      background: #00E5FF;
      width: 64px;
      height: 64px;
      border-radius: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      font-size: 2rem;
      color: white;
    }
    .card h3 {
      font-size: 1.4rem;
      font-weight: 700;
      margin-bottom: 0.5rem;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
      text-align: center;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      background: linear-gradient(135deg,#7B2FF7,#FF6B35);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .steps {
      display: flex;
      justify-content: center;
      gap: 35px;
    }
    .step-item {
      text-align: center;
      flex: 1;
    }
    .step-circle {
      width: 56px;
      height: 56px;
      background: linear-gradient(135deg,#7B2FF7,#FF6B35);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 12px;
      font-weight: 800;
      color: white;
    }
    .device-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 25px;
    }
    .device-card img {
      border-radius: 32px;
      box-shadow: 0 20px 30px rgba(0,0,0,0.1);
      transition: 0.3s;
    }
    .device-card:hover img {
      transform: scale(1.03);
    }
    .faq-item {
      background: #F5F3F0;
      border-radius: 20px;
      margin-bottom: 16px;
      padding: 20px 24px;
      cursor: pointer;
    }
    .cta-banner {
      background: linear-gradient(135deg,#7B2FF7,#FF6B35);
      border-radius: 36px;
      padding: 65px 40px;
      text-align: center;
      color: white;
    }
    footer {
      background: #0F0F1A;
      color: #ccc;
      padding: 45px 0 25px;
    }
    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2,1fr); }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links, .nav-download-btn { display: none; }
      .mobile-nav { display: block; }
      .hero { min-height: auto; padding: 130px 0 80px; }
      .hero-content { flex-direction: column; }
      .grid-4, .stats-grid { grid-template-columns: 1fr; }
      .steps { flex-direction: column; }
      .device-grid { grid-template-columns: 1fr; }
    }