/* roulang page: index */
:root {
      --deep-space: #0A0E27;
      --card-bg: #111633;
      --magenta: #FF2D55;
      --magenta-hover: #FF1A45;
      --cyan: #00E5FF;
      --white: #FFFFFF;
      --light-gray: #F5F6FA;
      --text-primary-dark: #FFFFFF;
      --text-secondary-dark: #B0B8D0;
      --text-primary-light: #1A1F36;
      --text-secondary-light: #5A6070;
      --border-glow: rgba(255, 45, 85, 0.2);
      --border-subtle: rgba(255, 255, 255, 0.08);
      --shadow-dark: 0 12px 32px rgba(0, 0, 0, 0.45);
      --shadow-light: 0 8px 24px rgba(0, 0, 0, 0.06);
      --radius-card: 20px;
      --radius-btn: 10px;
      --radius-icon: 14px;
      --transition: 0.3s cubic-bezier(0.23, 1, 0.32, 1);
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --max-width: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--deep-space);
      color: var(--text-primary-dark);
      line-height: 1.6;
      overflow-x: hidden;
    }

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

    /* 顶部信息条 */
    .top-bar {
      background: #080B1F;
      height: 40px;
      display: flex;
      align-items: center;
      font-size: 0.8rem;
      color: #6B7280;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    .top-bar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .top-bar-left {
      display: flex;
      gap: 16px;
      align-items: center;
    }
    .domain-text {
      color: #9CA3AF;
      letter-spacing: 0.3px;
    }
    .top-bar-right {
      display: flex;
      gap: 20px;
    }
    .safety-tip {
      color: #00E5FF;
      font-weight: 500;
    }

    /* 主导航 */
    .main-nav {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(10, 14, 39, 0.88);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(255, 45, 85, 0.1);
      height: 76px;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 1.7rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--white);
      text-decoration: none;
    }
    .logo-dot {
      width: 10px;
      height: 10px;
      background: var(--magenta);
      border-radius: 50%;
      display: inline-block;
      margin-right: 4px;
      box-shadow: 0 0 12px var(--magenta);
    }
    .nav-menu {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-link {
      color: #B0B8D0;
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      position: relative;
    }
    .nav-link:hover {
      color: var(--white);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--magenta);
      transition: width 0.2s ease;
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .btn-nav-cta {
      background: var(--magenta);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      font-size: 0.9rem;
      transition: background 0.2s, transform 0.2s;
      box-shadow: 0 4px 14px rgba(255, 45, 85, 0.4);
      border: none;
      cursor: pointer;
      letter-spacing: 0.3px;
    }
    .btn-nav-cta:hover {
      background: var(--magenta-hover);
      transform: translateY(-2px);
    }

    /* 汉堡菜单 */
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 4px;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: white;
      border-radius: 2px;
      transition: 0.2s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 76px;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 39, 0.96);
      backdrop-filter: blur(30px);
      flex-direction: column;
      padding: 32px 24px;
      gap: 24px;
      z-index: 99;
    }
    .mobile-menu a {
      color: white;
      font-size: 1.2rem;
      text-decoration: none;
      font-weight: 500;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, #1E2345, #0A0E27 80%);
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(0,229,255,0.15) 0%, transparent 70%);
      top: 20%;
      right: 10%;
      filter: blur(60px);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero-title {
      font-size: 3.2rem;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.02em;
      color: white;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: #B0B8D0;
      margin-bottom: 36px;
      max-width: 450px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--magenta);
      color: white;
      padding: 16px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      text-decoration: none;
      transition: 0.2s;
      box-shadow: 0 8px 22px rgba(255, 45, 85, 0.5);
      border: none;
      cursor: pointer;
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: var(--magenta-hover);
      transform: translateY(-3px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid rgba(255,255,255,0.35);
      color: white;
      padding: 16px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: 0.2s;
    }
    .btn-outline:hover {
      border-color: var(--magenta);
      color: var(--magenta);
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 28px;
      height: 420px;
      box-shadow: 0 0 40px rgba(0, 229, 255, 0.2);
      border: 1px solid rgba(255,45,85,0.25);
    }

    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 2.3rem;
      font-weight: 700;
      margin-bottom: 16px;
      letter-spacing: -0.02em;
    }
    .section-desc {
      color: #B0B8D0;
      max-width: 600px;
      margin-bottom: 48px;
      font-size: 1.1rem;
    }

    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .adv-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(10px);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      transition: 0.3s;
    }
    .adv-icon {
      font-size: 2rem;
      margin-bottom: 20px;
      color: var(--cyan);
    }
    .adv-card h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
    }

    .feature-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
    }
    .feature-img {
      background: url('/assets/images/coverpic/cover-1.webp') center/cover no-repeat;
      height: 320px;
      border-radius: 24px;
      border: 1px solid rgba(255,45,85,0.2);
    }
    .scenario-cards {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .scenario-card {
      background: #111633;
      border-radius: 24px;
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.05);
      transition: 0.3s;
    }
    .scenario-card:hover {
      border-color: var(--magenta);
      transform: translateY(-5px);
    }
    .scenario-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .stats {
      display: flex;
      justify-content: space-around;
      text-align: center;
      background: rgba(255,255,255,0.02);
      padding: 48px;
      border-radius: 32px;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--cyan);
    }

    .faq-section {
      background: #F5F6FA;
      color: #1A1F36;
    }
    .faq-item {
      border-bottom: 1px solid #ddd;
      padding: 16px 0;
    }
    .faq-question {
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    .footer {
      background: #0A0E27;
      padding: 60px 0;
      color: #B0B8D0;
    }
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .advantages-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .hero-title { font-size: 2.4rem; }
      .section-title { font-size: 1.9rem; }
    }