/* roulang page: index */
:root {
      --primary: #FF4E00;
      --primary-hover: #FFB800;
      --secondary: #7B2FFF;
      --bg-deep: #0B0C10;
      --bg-card: #1A1A2E;
      --bg-light: #F5F5F7;
      --text-primary: #FFFFFF;
      --text-secondary: rgba(255,255,255,0.7);
      --text-dark: #1A1A2E;
      --border-card: rgba(255,78,0,0.15);
      --border-active: #FF4E00;
      --radius-sm: 12px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --radius-full: 50px;
      --shadow-glow: 0 8px 32px rgba(255,78,0,0.12);
      --shadow-hover: 0 12px 40px rgba(255,78,0,0.25);
      --font-display: 'Orbitron', sans-serif;
      --font-body: 'Inter', 'Noto Sans SC', sans-serif;
      --container-max: 1280px;
      --header-height: 72px;
      --gap-section: 80px;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--bg-deep);
    }

    body {
      font-family: var(--font-body);
      font-size: 16px;
      font-weight: 400;
      line-height: 1.7;
      color: var(--text-primary);
      background-color: var(--bg-deep);
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease;
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      border: none;
      outline: none;
      transition: all 0.3s ease;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(11, 12, 16, 0.92);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      z-index: 1000;
      border-bottom: 1px solid rgba(255,255,255,0.06);
      display: flex;
      align-items: center;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--text-primary);
      letter-spacing: 1px;
    }

    .logo-icon {
      width: 32px;
      height: 28px;
      background: var(--primary);
      clip-path: polygon(0% 20%, 40% 0%, 100% 0%, 90% 100%, 30% 100%, 0% 70%);
      display: inline-block;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-secondary);
      padding: 8px 0;
      position: relative;
      letter-spacing: 0.3px;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }

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

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--primary);
      color: #fff;
      border-radius: var(--radius-full);
      padding: 12px 28px;
      font-weight: 600;
      font-size: 0.95rem;
      letter-spacing: 0.5px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      white-space: nowrap;
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: var(--shadow-hover);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-full);
      padding: 12px 28px;
      font-weight: 600;
      font-size: 0.95rem;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      white-space: nowrap;
    }

    .btn-outline:hover {
      background: var(--primary);
      color: #fff;
      box-shadow: var(--shadow-glow);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 4px;
    }

    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: #fff;
      border-radius: 4px;
      transition: 0.3s;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: var(--header-height);
      right: 0;
      width: 280px;
      background: rgba(11,12,16,0.98);
      backdrop-filter: blur(24px);
      height: calc(100vh - var(--header-height));
      padding: 32px 24px;
      flex-direction: column;
      gap: 24px;
      z-index: 999;
      transform: translateX(100%);
      transition: transform 0.35s ease;
    }

    .mobile-menu.open {
      transform: translateX(0);
    }

    .mobile-menu a {
      font-size: 1.2rem;
      font-weight: 500;
      color: var(--text-secondary);
      padding: 8px 0;
    }

    /* 首屏 */
    .hero {
      padding-top: calc(var(--header-height) + 48px);
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 20%, rgba(123,47,255,0.18) 0%, transparent 50%), var(--bg-deep);
      position: relative;
      overflow: hidden;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 48px;
      align-items: center;
      width: 100%;
    }

    .hero-content h1 {
      font-family: var(--font-display);
      font-size: clamp(2.5rem, 6vw, 3.4rem);
      font-weight: 900;
      letter-spacing: 2px;
      line-height: 1.2;
      color: #fff;
      margin-bottom: 20px;
    }

    .hero-content h1 span {
      color: var(--primary);
    }

    .rotating-text {
      font-size: 1.4rem;
      font-weight: 600;
      color: var(--secondary);
      margin-bottom: 24px;
      min-height: 2rem;
    }

    .hero-desc {
      color: var(--text-secondary);
      margin-bottom: 36px;
      max-width: 480px;
      font-size: 1.05rem;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .hero-visual {
      display: flex;
      justify-content: center;
      align-items: center;
      position: relative;
    }

    .phone-mock {
      width: 260px;
      height: 520px;
      background: linear-gradient(145deg, #1e1e32, #0e0e1a);
      border-radius: 36px;
      border: 2px solid rgba(255,78,0,0.25);
      box-shadow: 0 25px 60px rgba(255,78,0,0.2);
      position: relative;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .phone-screen {
      width: 90%;
      height: 92%;
      background: #0B0C10;
      border-radius: 28px;
      background-image: url('/assets/images/coverpic/cover-1.webp');
      background-size: cover;
      background-position: center;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-end;
      padding-bottom: 20px;
    }

    .scroll-hint {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      color: var(--text-secondary);
      font-size: 0.85rem;
      animation: bounce 2s infinite;
    }

    @keyframes bounce {
      0%,100%{transform:translateX(-50%)translateY(0);}
      50%{transform:translateX(-50%)translateY(8px);}
    }

    /* 板块通用 */
    section {
      padding: var(--gap-section) 0;
    }

    .section-tag {
      color: var(--primary);
      font-weight: 600;
      letter-spacing: 2px;
      text-transform: uppercase;
      font-size: 0.85rem;
      margin-bottom: 12px;
    }

    .section-title {
      font-family: var(--font-display);
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 16px;
    }

    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-card);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      transition: all 0.3s ease;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      border-color: var(--primary);
      box-shadow: var(--shadow-glow);
    }

    .feature-icon {
      font-size: 2rem;
      margin-bottom: 16px;
      color: var(--primary);
    }

    .feature-card h4 {
      font-size: 1.2rem;
      margin-bottom: 8px;
      font-weight: 600;
    }

    .feature-card p {
      color: var(--text-secondary);
      font-size: 0.9rem;
    }

    /* 数据看板 */
    .stats-band {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 48px 24px;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
      border: 1px solid rgba(255,255,255,0.05);
    }

    .stat-item .stat-number {
      font-family: var(--font-display);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary);
    }

    .stat-label {
      color: var(--text-secondary);
      font-size: 0.9rem;
      margin-top: 8px;
    }

    /* 流程 */
    .steps-row {
      display: flex;
      align-items: flex-start;
      justify-content: space-between;
      gap: 24px;
    }

    .step {
      text-align: center;
      flex: 1;
    }

    .step-number {
      font-family: var(--font-display);
      font-size: 3.5rem;
      font-weight: 700;
      color: transparent;
      -webkit-text-stroke: 2px var(--primary);
      margin-bottom: 12px;
    }

    /* 安全 */
    .security-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .badge-row {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 16px;
    }

    .badge-item {
      background: var(--bg-card);
      border-radius: var(--radius-sm);
      padding: 16px;
      text-align: center;
      filter: grayscale(0.6);
      transition: 0.3s;
    }

    .badge-item:hover {
      filter: grayscale(0);
      border: 1px solid var(--primary);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    details.faq-item {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      border: 1px solid var(--border-card);
    }

    details.faq-item[open] {
      border-color: var(--primary);
    }

    summary {
      padding: 18px 24px;
      font-weight: 600;
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: #fff;
    }

    summary::after {
      content: '+';
      font-size: 1.4rem;
      color: var(--primary);
      transition: 0.3s;
    }

    details[open] summary::after {
      content: '−';
    }

    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-secondary);
      font-size: 0.95rem;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #0B0C10, #1A1025);
      text-align: center;
      border-radius: var(--radius-lg);
      padding: 64px 24px;
      margin-top: var(--gap-section);
    }

    .big-download-btn {
      background: var(--primary);
      color: #fff;
      border-radius: var(--radius-full);
      padding: 18px 48px;
      font-weight: 700;
      font-size: 1.2rem;
      margin-top: 28px;
      display: inline-flex;
      align-items: center;
      gap: 12px;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 48px;
      padding-top: 48px;
      border-top: 1px solid rgba(255,255,255,0.06);
    }

    .copyright {
      text-align: center;
      padding: 24px 0;
      color: var(--text-secondary);
      font-size: 0.85rem;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; text-align: center; }
      .hero-visual { order: -1; }
      .phone-mock { width: 200px; height: 400px; }
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .stats-band { grid-template-columns: repeat(2,1fr); }
      .security-grid { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links, .header .btn-primary { display: none; }
      .hamburger { display: flex; }
      .mobile-menu { display: flex; }
      .features-grid { grid-template-columns: 1fr; }
      .steps-row { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
    }