/* roulang page: index */
:root {
      --primary-blue: #1E90FF;
      --deep-blue: #0B1A3B;
      --accent-cyan: #00E5FF;
      --bg-dark: #0A0F1E;
      --white: #FFFFFF;
      --grey-light: #B0C4DE;
      --text-body: #E0E8F0;
      --card-bg: rgba(255, 255, 255, 0.05);
      --card-border: rgba(255, 255, 255, 0.15);
      --glass-blur: 12px;
      --radius-card: 20px;
      --radius-btn: 50px;
      --radius-input: 12px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 0 15px rgba(30, 144, 255, 0.6);
      --shadow-cyan: 0 0 12px rgba(0, 229, 255, 0.5);
      --transition: all 0.3s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background: linear-gradient(135deg, #0A0F1E 0%, #0B1A3B 100%);
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      height: 80px;
      display: flex;
      align-items: center;
      backdrop-filter: blur(16px);
      background: transparent;
      transition: background 0.3s, box-shadow 0.3s;
    }
    .header.scrolled {
      background: rgba(10, 15, 30, 0.85);
      box-shadow: 0 4px 20px rgba(0,0,0,0.4);
    }
    .nav-bar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: #fff;
      text-decoration: none;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
    }
    .logo span {
      background: linear-gradient(135deg, var(--primary-blue), var(--accent-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: rgba(255,255,255,0.85);
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      transition: color 0.3s, text-shadow 0.3s;
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-cyan);
      text-shadow: 0 0 8px rgba(0,229,255,0.5);
    }
    .btn-primary-small {
      background: linear-gradient(135deg, var(--primary-blue), var(--accent-cyan));
      border: none;
      color: #fff;
      padding: 10px 24px;
      border-radius: 50px;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      box-shadow: var(--shadow-glow);
      text-decoration: none;
      display: inline-block;
    }
    .btn-primary-small:hover {
      filter: brightness(1.2);
      box-shadow: 0 0 24px rgba(30,144,255,0.9);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 28px;
      height: 2.5px;
      background: white;
      border-radius: 2px;
      transition: 0.3s;
    }

    /* 区块通用 */
    section {
      padding: 120px 0;
    }

    h2 {
      font-size: 36px;
      font-weight: 600;
      color: white;
      text-align: center;
      margin-bottom: 16px;
      position: relative;
    }
    .title-decor {
      width: 60px;
      height: 4px;
      background: linear-gradient(90deg, var(--primary-blue), var(--accent-cyan));
      margin: 0 auto 48px;
      border-radius: 4px;
      box-shadow: var(--shadow-glow);
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      background: radial-gradient(circle at 20% 30%, #1E2B45, #0A0F1E);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      padding-top: 80px;
    }
    .hero::before {
      content: '';
      position: absolute;
      top:0; left:0; width:100%; height:100%;
      background: repeating-linear-gradient(45deg, rgba(30,144,255,0.08) 0px, rgba(30,144,255,0.08) 2px, transparent 2px, transparent 12px);
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 40px;
    }
    .hero-text {
      flex: 1 1 500px;
    }
    .hero h1 {
      font-size: clamp(2.5rem, 6vw, 4rem);
      font-weight: 700;
      color: white;
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 1.3rem;
      color: var(--grey-light);
      margin-bottom: 40px;
      max-width: 550px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-ghost {
      background: transparent;
      border: 1.5px solid rgba(255,255,255,0.7);
      color: white;
      padding: 14px 36px;
      border-radius: 50px;
      font-weight: 600;
      text-decoration: none;
      transition: 0.3s;
    }
    .btn-ghost:hover {
      background: rgba(255,255,255,0.1);
      border-color: var(--accent-cyan);
      box-shadow: 0 0 16px rgba(0,229,255,0.4);
      color: white;
    }
    .hero-image {
      flex: 1 1 450px;
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(12px);
      border-radius: 32px;
      padding: 20px;
      border: 1px solid rgba(255,255,255,0.2);
    }
    .hero-image img {
      width: 100%;
      border-radius: 24px;
      display: block;
    }

    /* 卡片系统 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(var(--glass-blur));
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: all 0.35s ease;
      box-shadow: var(--shadow-card);
      position: relative;
    }
    .glass-card:hover {
      transform: translateY(-8px);
      border-color: rgba(30,144,255,0.5);
      box-shadow: 0 16px 48px rgba(30,144,255,0.25);
    }
    .icon-wrap {
      font-size: 2.5rem;
      color: var(--accent-cyan);
      margin-bottom: 20px;
    }

    /* 功能图文区 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 100px;
    }
    .feature-text {
      flex: 1;
    }
    .feature-image {
      flex: 1;
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(8px);
      border-radius: 24px;
      border: 1px solid rgba(255,255,255,0.2);
      overflow: hidden;
    }
    .feature-image img {
      width: 100%;
      display: block;
      border-radius: 24px;
    }

    /* 案例数据 */
    .stats {
      display: flex;
      justify-content: space-around;
      text-align: center;
      margin: 50px 0;
      flex-wrap: wrap;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      background: linear-gradient(to right, var(--primary-blue), var(--accent-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    /* FAQ */
    .faq-item {
      background: var(--card-bg);
      backdrop-filter: blur(8px);
      border: 1px solid var(--card-border);
      border-radius: 12px;
      margin-bottom: 16px;
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 32px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      color: white;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: rgba(255,255,255,0.05);
      padding: 0 32px;
    }
    .faq-answer p {
      padding: 16px 0;
      color: #D0E0F0;
    }

    /* 表单 */
    .contact-form {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(20px);
      border-radius: 24px;
      padding: 48px;
      border: 1px solid rgba(255,255,255,0.2);
    }
    .input-field {
      width: 100%;
      padding: 14px 20px;
      margin-bottom: 20px;
      background: rgba(0,0,0,0.4);
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: 12px;
      color: white;
      outline: none;
      transition: 0.3s;
    }
    .input-field:focus {
      border-color: var(--primary-blue);
      box-shadow: 0 0 10px var(--primary-blue);
    }

    footer {
      background: #060B14;
      padding: 60px 0 30px;
    }

    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .feature-row { flex-direction: column; }
    }
    @media (max-width: 768px) {
      .hamburger { display: flex; }
      .nav-links { display: none; position: fixed; top: 80px; left:0; width:100%; background: rgba(10,15,30,0.95); flex-direction: column; padding: 32px; backdrop-filter: blur(16px); }
      .nav-links.active { display: flex; }
      .grid-3 { grid-template-columns: 1fr; }
      .hero-content { flex-direction: column; }
      .stats { flex-direction: column; gap: 24px; }
    }