/* roulang page: index */
:root {
      --primary-dark: #1a1a1a;
      --accent-green: #00e676;
      --cta-orange: #ff6d00;
      --cta-orange-hover: #e65100;
      --bg-light: #f5f5f7;
      --card-white: #ffffff;
      --text-main: #1e1e1e;
      --text-secondary: #5a5a5a;
      --text-on-dark: rgba(255,255,255,0.85);
      --border-light: rgba(0,0,0,0.06);
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 12px 32px rgba(0,0,0,0.08);
      --radius-lg: 16px;
      --radius-pill: 50px;
      --font-title: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

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

    /* 导航系统 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 999;
      background: transparent;
      transition: background 0.3s ease, box-shadow 0.3s ease;
      padding: 12px 0;
    }

    .site-header.scrolled {
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(10px);
      box-shadow: 0 2px 16px rgba(0,0,0,0.05);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      font-family: var(--font-title);
      letter-spacing: 1px;
    }
    .logo .im {
      color: var(--accent-green);
    }
    .logo .ty {
      color: white;
      transition: color 0.3s;
    }
    .scrolled .logo .ty {
      color: var(--primary-dark);
    }

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

    .nav-menu a {
      font-weight: 500;
      font-size: 1rem;
      color: rgba(255,255,255,0.9);
      transition: color 0.2s;
      position: relative;
    }
    .scrolled .nav-menu a {
      color: var(--text-main);
    }
    .nav-menu a:hover {
      color: var(--accent-green);
    }

    .btn-nav {
      background: var(--cta-orange);
      color: white !important;
      padding: 10px 24px;
      border-radius: 50px;
      font-weight: 600;
      transition: background 0.2s, transform 0.2s;
      display: inline-block;
    }
    .btn-nav:hover {
      background: var(--cta-orange-hover);
      transform: scale(1.03);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 25px;
      height: 2px;
      background: white;
      transition: 0.3s;
      display: block;
    }
    .scrolled .hamburger span {
      background: var(--primary-dark);
    }

    /* 英雄区 */
    .hero {
      min-height: 100vh;
      background: linear-gradient(135deg, #0f0f0f 0%, #1a1a1a 60%, #2a2a2a 100%);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      display: flex;
      align-items: center;
      color: white;
      padding: 0 24px;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(0,0,0,0.55);
      backdrop-filter: blur(2px);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 900px;
      margin: 0 auto;
      text-align: center;
    }
    .hero h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 20px;
    }
    .hero .subtitle {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
    }
    .data-capsules {
      display: flex;
      justify-content: center;
      gap: 28px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }
    .capsule {
      background: rgba(0,0,0,0.5);
      backdrop-filter: blur(8px);
      padding: 12px 24px;
      border-radius: 40px;
      font-weight: 500;
      border: 1px solid rgba(255,255,255,0.15);
    }
    .capsule span {
      color: var(--accent-green);
      font-weight: 700;
      font-size: 1.4rem;
      margin-right: 6px;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--cta-orange);
      color: white;
      padding: 14px 40px;
      border-radius: 50px;
      font-weight: 600;
      transition: 0.2s;
      border: none;
      cursor: pointer;
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: var(--cta-orange-hover);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--accent-green);
      color: var(--accent-green);
      padding: 14px 40px;
      border-radius: 50px;
      font-weight: 600;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: rgba(0,230,118,0.1);
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 600;
      text-align: center;
      margin-bottom: 16px;
    }
    .section-desc {
      text-align: center;
      color: var(--text-secondary);
      max-width: 600px;
      margin: 0 auto 48px;
    }

    /* 服务网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
    }
    .service-card {
      background: var(--card-white);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
      text-align: center;
      position: relative;
      overflow: hidden;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
    }
    .service-icon {
      width: 64px;
      height: 64px;
      background: rgba(0,230,118,0.1);
      border-radius: 50%;
      margin: 0 auto 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2rem;
    }
    .service-card h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
    }
    .data-badge {
      position: absolute;
      bottom: 16px;
      right: 20px;
      background: var(--accent-green);
      color: black;
      font-size: 0.8rem;
      padding: 4px 12px;
      border-radius: 20px;
      opacity: 0;
      transition: 0.3s;
    }
    .service-card:hover .data-badge {
      opacity: 1;
    }

    /* 数据看板 */
    .dark-board {
      background: var(--primary-dark);
      color: white;
      border-radius: 24px;
      padding: 60px 30px;
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
    }
    .stat-card {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 20px;
      padding: 32px 40px;
      text-align: center;
      min-width: 180px;
    }
    .stat-number {
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--accent-green);
      animation: pulse 2s infinite;
    }
    @keyframes pulse { 0% { opacity: 0.9; } 50% { opacity: 1; text-shadow: 0 0 10px var(--accent-green); } }

    /* 对比区 */
    .compare-row {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .compare-left, .compare-right {
      flex: 1;
    }
    .divider {
      width: 2px;
      height: 200px;
      background: linear-gradient(to bottom, transparent, #ccc, transparent);
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 16px;
      margin-bottom: 20px;
      font-size: 1.1rem;
    }
    .icon-x { color: #d32f2f; font-weight: bold; }
    .icon-check { color: var(--accent-green); font-weight: bold; }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 12px;
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
    }
    .faq-question {
      padding: 20px 28px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      font-size: 1.1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s ease;
      background: #fafafa;
      padding: 0 28px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 20px 28px;
    }

    /* 表单 */
    .cta-form {
      background: #f0f2f5;
      border-radius: 28px;
      padding: 50px;
      text-align: center;
    }
    .input-group {
      display: flex;
      max-width: 500px;
      margin: 24px auto 0;
    }
    .input-group input {
      flex: 1;
      padding: 16px 24px;
      border-radius: 50px 0 0 50px;
      border: 1px solid #ddd;
      outline: none;
    }
    .input-group button {
      border-radius: 0 50px 50px 0;
      background: var(--cta-orange);
      color: white;
      border: none;
      padding: 0 32px;
      font-weight: 600;
      cursor: pointer;
    }

    footer {
      background: #111;
      color: #aaa;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .compare-row { flex-direction: column; }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .hero h1 { font-size: 2.2rem; }
      .services-grid { grid-template-columns: 1fr; }
      .input-group { flex-direction: column; }
      .input-group input, .input-group button { border-radius: 50px; width: 100%; }
      .footer-grid { grid-template-columns: 1fr; }
    }