/* roulang page: index */
:root {
      --bg-deep: #0B0C0E;
      --bg-section: #13151A;
      --bg-card: #1C1F26;
      --gold: #C8A951;
      --gold-soft: rgba(200,169,81,0.18);
      --red: #E63946;
      --text-white: #FFFFFF;
      --text-gray: #B0B3BD;
      --text-muted: #6B6F7A;
      --border-light: #2A2D35;
      --border-gold: rgba(200,169,81,0.4);
      --font-heading: 'Oswald', sans-serif;
      --font-body: 'Inter', 'Noto Sans SC', sans-serif;
      --font-mono: 'JetBrains Mono', monospace;
      --radius-sm: 4px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --shadow-gold: 0 8px 24px rgba(200,169,81,0.12);
      --transition-base: 0.2s ease;
      --container-max: 1280px;
      --nav-height: 80px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-deep);
      color: var(--text-gray);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    h1 {
      font-size: 56px;
      font-weight: 900;
      line-height: 1.1;
      color: var(--text-white);
    }
    h2 {
      font-size: 40px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--gold);
    }
    h3 {
      font-size: 24px;
      font-weight: 600;
      line-height: 1.3;
      color: var(--text-white);
      font-family: var(--font-body);
      text-transform: none;
    }
    .caption {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-base);
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 14px;
      letter-spacing: 1px;
      text-transform: uppercase;
      border-radius: var(--radius-sm);
      padding: 12px 28px;
      transition: all var(--transition-base);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: none;
    }
    .btn-primary {
      background: var(--gold);
      color: var(--bg-deep);
    }
    .btn-primary:hover {
      background: var(--red);
      color: white;
      box-shadow: 0 8px 18px rgba(230,57,70,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--gold);
      color: var(--gold);
    }
    .btn-outline:hover {
      background: var(--gold);
      color: var(--bg-deep);
    }
    .btn-red {
      background: var(--red);
      color: white;
    }
    .btn-red:hover {
      background: #c92d3a;
    }
    section {
      padding: 90px 0;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(11,12,14,0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      background-image: linear-gradient(rgba(200,169,81,0.25), transparent 90%);
      border-image: linear-gradient(to right, var(--gold), transparent) 1;
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: baseline;
      gap: 4px;
    }
    .logo-main {
      font-family: var(--font-heading);
      font-size: 24px;
      font-weight: 700;
      color: var(--text-white);
      letter-spacing: 1px;
    }
    .logo-sub {
      font-size: 12px;
      color: var(--gold);
      font-weight: 600;
      background: rgba(200,169,81,0.15);
      padding: 2px 6px;
      border-radius: 3px;
      margin-left: 2px;
    }
    .nav-menu {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-link {
      font-family: var(--font-body);
      font-weight: 500;
      font-size: 14px;
      color: var(--text-gray);
      position: relative;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--gold);
      transition: width 0.2s;
    }
    .nav-link:hover {
      color: var(--gold);
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .nav-cta {
      margin-left: 16px;
    }
    .hamburger {
      display: none;
      font-size: 24px;
      color: var(--text-white);
      background: none;
      border: none;
    }
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
    }
    /* Hero */
    .hero {
      padding: 140px 0 80px;
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .hero-left {
      flex: 0 0 42%;
    }
    .hero-right {
      flex: 1;
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      background: #1a1d24;
    }
    .hero-img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .score-overlay {
      position: absolute;
      bottom: 20px;
      left: 20px;
      background: rgba(11,12,14,0.8);
      backdrop-filter: blur(8px);
      padding: 8px 18px;
      border-radius: 6px;
      font-family: var(--font-mono);
      color: var(--gold);
      font-weight: 500;
      border-left: 4px solid var(--red);
    }
    .hero-title {
      margin-bottom: 18px;
    }
    .hero-sub {
      font-size: 20px;
      color: var(--text-gray);
      margin-bottom: 32px;
      font-weight: 400;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    /* 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-light);
      border-radius: var(--radius-md);
      padding: 28px 22px;
      transition: all 0.25s;
    }
    .feature-card:hover {
      border-color: var(--gold);
      box-shadow: var(--shadow-gold);
    }
    .feature-large {
      grid-row: span 2;
      display: flex;
      flex-direction: column;
      justify-content: center;
      border-left: 4px solid var(--gold);
    }
    .feature-icon {
      font-size: 28px;
      color: var(--gold);
      margin-bottom: 18px;
    }
    .feature-title {
      font-family: var(--font-heading);
      font-size: 20px;
      color: var(--gold);
      margin-bottom: 10px;
    }
    /* 案例瀑布 */
    .cases-waterfall {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .case-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: transform 0.25s, box-shadow 0.3s;
    }
    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 16px 28px rgba(0,0,0,0.5);
      border: 1px solid var(--gold);
    }
    .case-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }
    .case-tag {
      background: rgba(230,57,70,0.9);
      color: white;
      font-size: 12px;
      padding: 4px 10px;
      display: inline-block;
      margin: 12px 12px 4px;
      border-radius: 3px;
    }
    .case-title {
      padding: 0 12px 12px;
      font-weight: 600;
    }
    /* 对比表 */
    .compare-wrapper {
      display: flex;
      gap: 0;
      align-items: stretch;
      background: var(--bg-section);
      border-radius: var(--radius-lg);
      overflow: hidden;
    }
    .compare-col {
      flex: 1;
      padding: 36px 28px;
    }
    .compare-left {
      background: #2A1A1C;
    }
    .compare-right {
      background: #1C1A0E;
    }
    .vs-divider {
      width: 3px;
      background: linear-gradient(to bottom, var(--gold), transparent);
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin: 18px 0;
      font-weight: 500;
    }
    /* FAQ */
    .faq-group {
      margin-bottom: 32px;
    }
    .faq-item {
      background: var(--bg-card);
      margin-bottom: 8px;
      border-radius: var(--radius-sm);
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--text-white);
    }
    .faq-answer {
      padding: 0 20px 18px;
      color: var(--text-gray);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* 联系 */
    .contact-box {
      background: var(--bg-deep);
      text-align: center;
      padding: 50px 20px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-light);
    }
    .input-group {
      display: flex;
      max-width: 480px;
      margin: 24px auto;
    }
    .input-group input {
      flex:1;
      background: #1C1F26;
      border:1px solid var(--gold);
      padding: 12px 16px;
      color: white;
      border-radius: var(--radius-sm) 0 0 var(--radius-sm);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
      padding: 50px 0 30px;
    }
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .cases-waterfall { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: block; }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left:0;right:0;
        background: #13151A;
        justify-content: space-around;
        padding: 10px 0;
        z-index: 999;
      }
      .hero { flex-direction: column; }
      .hero-right { display: none; }
      .features-grid { grid-template-columns: 1fr; }
      .cases-waterfall { grid-template-columns: 1fr; }
      .compare-wrapper { flex-direction: column; }
      .vs-divider { width:100%; height:3px; }
      .footer-grid { grid-template-columns: 1fr; }
      h1 { font-size: 40px; }
    }