/* roulang page: index */
:root {
      --ink-black: #1A1C20;
      --titanium-gray: #E8ECF1;
      --deep-amethyst: #4A3B52;
      --bronze-gold: #B4946C;
      --warm-porcelain: #F7F5F2;
      --pure-white: #FFFFFF;
      --text-body: #4A4F57;
      --text-muted: #6B717A;
      --text-light: #9AA0A8;
      --footer-bg: #1E2025;
      --border-light: rgba(0,0,0,0.04);
      --shadow-card: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 28px rgba(0,0,0,0.1);
      --radius-sm: 4px;
      --radius-md: 6px;
      --radius-lg: 8px;
      --transition-smooth: cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-inter: "Inter", "Noto Sans SC", sans-serif;
      --section-gap: 5rem;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--warm-porcelain);
      color: var(--text-body);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      background-image: radial-gradient(circle at 20% 30%, rgba(0,0,0,0.01) 1px, transparent 1px);
      background-size: 40px 40px;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }
    h1, h2, h3 {
      font-weight: 700;
      color: var(--ink-black);
      letter-spacing: -0.01em;
    }
    h1 {
      font-size: 56px;
      line-height: 1.15;
      letter-spacing: -0.02em;
    }
    h2 {
      font-size: 36px;
      margin-bottom: 1.5rem;
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    h2::after {
      content: '';
      display: inline-block;
      width: 40px;
      height: 2px;
      background-color: var(--deep-amethyst);
      flex-shrink: 0;
    }
    h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 0.5rem;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      font-weight: 600;
      transition: all 0.3s var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      border: none;
    }
    /* 导航栏 Mega Menu */
    .mega-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 80px;
      background: rgba(247, 245, 242, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--titanium-gray);
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-family: var(--font-inter);
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--ink-black);
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .logo i {
      color: var(--deep-amethyst);
      font-size: 1.8rem;
    }
    .nav-links {
      display: flex;
      gap: 2.5rem;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 0.25rem 0;
      transition: color 0.2s;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--deep-amethyst);
      transition: width 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--deep-amethyst);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .mega-trigger {
      position: relative;
      cursor: pointer;
      font-weight: 500;
      color: var(--text-body);
      display: flex;
      align-items: center;
      gap: 0.25rem;
    }
    .mega-panel {
      position: absolute;
      top: 60px;
      right: 0;
      width: 600px;
      background: var(--pure-white);
      border-radius: var(--radius-lg);
      box-shadow: 0 20px 40px rgba(26,28,32,0.08);
      padding: 2rem;
      display: flex;
      gap: 2rem;
      visibility: hidden;
      opacity: 0;
      transition: opacity 0.25s ease, visibility 0.25s;
      z-index: 999;
    }
    .mega-trigger:hover .mega-panel {
      visibility: visible;
      opacity: 1;
    }
    .mega-col {
      flex: 1;
    }
    .mega-col h4 {
      font-size: 14px;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--bronze-gold);
      margin-bottom: 1rem;
      font-weight: 600;
    }
    .mega-item {
      padding: 0.5rem 0;
      display: block;
      color: var(--text-body);
      transition: background 0.2s;
      border-radius: 4px;
      padding-left: 0.5rem;
    }
    .mega-item:hover {
      background: var(--warm-porcelain);
      color: var(--deep-amethyst);
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      background: none;
      border: none;
      color: var(--ink-black);
    }
    @media (max-width: 1024px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .mega-trigger { display: none; }
    }
    /* Hero */
    .hero {
      margin-top: 80px;
      display: flex;
      align-items: center;
      min-height: 85vh;
      padding: 2rem 0;
    }
    .hero-grid {
      display: flex;
      gap: 3rem;
      width: 100%;
    }
    .hero-left {
      flex: 55%;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .hero-left h1 span {
      color: var(--deep-amethyst);
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 480px;
      margin: 1.5rem 0 2.5rem;
    }
    .cta-group {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--deep-amethyst);
      color: white;
      padding: 0.9rem 2.2rem;
      border-radius: var(--radius-sm);
      font-weight: 600;
      box-shadow: 0 4px 10px rgba(74,59,82,0.2);
    }
    .btn-primary:hover {
      background: #3C2E42;
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(74,59,82,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--deep-amethyst);
      color: var(--deep-amethyst);
      padding: 0.9rem 2.2rem;
      border-radius: var(--radius-sm);
    }
    .btn-outline:hover {
      background: rgba(74,59,82,0.05);
      transform: translateY(-2px);
    }
    .hero-right {
      flex: 45%;
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 450px;
      animation: float 6s ease-in-out infinite;
    }
    .hero-right::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(74,59,82,0.3) 0%, transparent 70%);
    }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-10px); }
      100% { transform: translateY(0); }
    }
    /* 能力亮点网格 */
    .capabilities {
      padding: var(--section-gap) 0;
    }
    .grid-highlight {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2px;
      background: var(--titanium-gray);
    }
    .card-basic {
      background: var(--pure-white);
      padding: 2.5rem 2rem;
      transition: all 0.25s;
    }
    .card-basic:nth-child(odd) {
      background: var(--warm-porcelain);
    }
    .card-basic i {
      font-size: 2.5rem;
      color: var(--deep-amethyst);
      margin-bottom: 1.5rem;
    }
    .card-basic h3 {
      margin-bottom: 0.75rem;
    }
    /* 案例瀑布流 */
    .cases {
      padding: var(--section-gap) 0;
    }
    .masonry {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all 0.3s var(--transition-smooth);
      display: flex;
      flex-direction: column;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      transition: transform 0.3s;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
    }
    .case-content {
      padding: 1.5rem;
    }
    .tag {
      font-size: 13px;
      font-weight: 500;
      color: var(--bronze-gold);
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }
    /* 解决方案对比 */
    .solutions {
      padding: var(--section-gap) 0;
    }
    .compare-table {
      display: flex;
      gap: 2rem;
      align-items: stretch;
    }
    .col-traditional, .col-db {
      flex: 1;
      background: white;
      padding: 2rem;
      border-radius: var(--radius-md);
    }
    .col-db {
      background: #F9F7FA;
    }
    .compare-row {
      display: flex;
      align-items: center;
      gap: 1rem;
      padding: 1rem 0;
      border-bottom: 1px dashed var(--titanium-gray);
    }
    .icon-fail { color: #C55; }
    .icon-check { color: var(--deep-amethyst); }
    /* 信任数据 */
    .trust {
      padding: 3rem 0;
      display: flex;
      align-items: center;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 2rem;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-inter);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--deep-amethyst);
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1.5rem;
    }
    .faq-item {
      border-bottom: 1px solid var(--titanium-gray);
      padding: 1rem 0;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 1rem 0 0;
    }
    /* CTA */
    .cta-dark {
      background: var(--ink-black);
      padding: 4rem 0;
      text-align: center;
    }
    .inline-form {
      display: flex;
      max-width: 500px;
      margin: 2rem auto 0;
    }
    .inline-form input {
      flex: 1;
      padding: 0.9rem 1.2rem;
      border: none;
      border-radius: var(--radius-sm) 0 0 var(--radius-sm);
      background: white;
    }
    .inline-form button {
      background: var(--bronze-gold);
      color: white;
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
      padding: 0.9rem 1.8rem;
      font-weight: 600;
      border: none;
    }
    .inline-form button:hover {
      background: #9e7e56;
    }
    footer {
      background: var(--footer-bg);
      color: var(--text-light);
      padding: 3rem 0 1.5rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    @media (max-width: 768px) {
      h1 { font-size: 40px; }
      .hero-grid { flex-direction: column; }
      .masonry { grid-template-columns: 1fr 1fr; }
      .compare-table { flex-direction: column; }
      .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }