/* roulang page: index */
:root {
      --deep-black: #0A0F1E;
      --metal-gold: #D4AF37;
      --accent-red: #FF4C29;
      --bg-warm: #FAFAFA;
      --card-white: #FFFFFF;
      --soft-gray: #F5F5F7;
      --text-primary: #1E1E1E;
      --text-secondary: #5A5A5A;
      --text-light: #B0B3BF;
      --border-light: #E5E5E5;
      --radius-card: 16px;
      --radius-btn: 40px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.08);
      --max-width: 1280px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Inter", sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-primary);
      line-height: 1.75;
      font-size: 16px;
      overflow-x: hidden;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      display: block;
      height: auto;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    button, .btn {
      cursor: pointer;
      border: none;
      background: none;
      font-family: inherit;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.25s ease;
    }
    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.02);
      transition: background 0.3s, box-shadow 0.3s;
    }
    #header.scrolled {
      background: rgba(255,255,255,0.98);
      box-shadow: 0 4px 20px rgba(0,0,0,0.06);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 26px;
      font-weight: 700;
      letter-spacing: 1px;
      color: var(--deep-black);
      display: flex;
      align-items: baseline;
    }
    .logo span {
      color: var(--metal-gold);
      margin-left: 4px;
      font-weight: 800;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 15px;
      color: var(--text-secondary);
      position: relative;
      padding: 4px 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--deep-black);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--metal-gold);
      transition: width 0.25s;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .btn-capsule {
      background: var(--accent-red);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      letter-spacing: 0.5px;
      box-shadow: 0 4px 12px rgba(255,76,41,0.3);
    }
    .btn-capsule:hover {
      background: #D63E1F;
      transform: scale(1.03);
      box-shadow: 0 8px 20px rgba(255,76,41,0.5);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--deep-black);
      border-radius: 2px;
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      height: calc(100vh - 72px);
      background: rgba(10,15,30,0.95);
      backdrop-filter: blur(16px);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      z-index: 999;
    }
    .mobile-menu a {
      color: white;
      font-size: 22px;
      font-weight: 600;
      letter-spacing: 1px;
    }
    .mobile-menu .btn-capsule {
      margin-top: 16px;
    }
    .mobile-menu.active {
      display: flex;
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
    }
    /* 区块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section { padding: 60px 0; }
    }
    h2 {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--deep-black);
    }
    h3 {
      font-size: 18px;
      font-weight: 400;
      color: var(--text-secondary);
      margin-bottom: 40px;
    }
    /* Hero */
    #hero {
      background: var(--deep-black);
      padding-top: 120px;
      padding-bottom: 80px;
      color: white;
      overflow: hidden;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .hero-left {
      flex: 0 0 55%;
    }
    .hero-right {
      flex: 0 0 40%;
      position: relative;
      transform: rotate(-2deg);
      border-radius: 24px;
      overflow: hidden;
      border: 2px solid rgba(212,175,55,0.25);
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    }
    .hero-right img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    h1 {
      font-size: 42px;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
      margin-bottom: 16px;
      color: white;
    }
    .hero-sub {
      font-size: 18px;
      color: #CCCCCC;
      margin-bottom: 32px;
    }
    .hero-stats {
      display: flex;
      gap: 32px;
      margin-bottom: 32px;
    }
    .stat-badge {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(8px);
      padding: 16px 24px;
      border-radius: 12px;
      border-left: 4px solid var(--metal-gold);
    }
    .stat-number {
      font-size: 28px;
      font-weight: 700;
      color: var(--metal-gold);
    }
    .stat-label {
      font-size: 13px;
      color: #aaa;
    }
    .btn-hero {
      background: var(--accent-red);
      color: white;
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 16px;
      box-shadow: 0 0 20px rgba(255,76,41,0.6);
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(255,76,41,0.7); }
      70% { box-shadow: 0 0 0 15px rgba(255,76,41,0); }
      100% { box-shadow: 0 0 0 0 rgba(255,76,41,0); }
    }
    @media (max-width: 768px) {
      .hero-grid { flex-direction: column; }
      .hero-right { order: -1; transform: rotate(0); margin-bottom: 20px; }
      h1 { font-size: 34px; }
    }
    /* 卡片通用 */
    .card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      padding: 32px;
      transition: all 0.25s ease;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    @media (max-width: 1024px) { .grid-3 { grid-template-columns: repeat(2,1fr); } }
    @media (max-width: 600px) { .grid-3 { grid-template-columns: 1fr; } }
    /* 优势卡片 */
    .adv-card {
      text-align: left;
      position: relative;
      padding-bottom: 28px;
    }
    .adv-icon {
      font-size: 32px;
      color: var(--metal-gold);
      margin-bottom: 16px;
      transition: transform 0.3s;
    }
    .adv-card:hover .adv-icon {
      transform: rotate(15deg);
    }
    .gold-line {
      position: absolute;
      bottom: 0;
      left: 0;
      width: 40px;
      height: 3px;
      background: var(--metal-gold);
      transition: width 0.3s;
    }
    .adv-card:hover .gold-line {
      width: 100%;
    }
    /* 服务网格 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 20px;
    }
    .service-item {
      background: #F5F5F7;
      border-radius: 16px;
      padding: 24px;
      display: flex;
      gap: 16px;
      align-items: flex-start;
      transition: 0.2s;
    }
    .service-item:hover {
      background: white;
      border: 1px solid var(--metal-gold);
    }
    @media (max-width: 768px) { .service-grid { grid-template-columns: 1fr; } }
    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      gap: 20px;
      flex-wrap: wrap;
    }
    .step {
      flex: 1;
      text-align: center;
      position: relative;
    }
    .step-circle {
      background: var(--metal-gold);
      color: var(--deep-black);
      width: 56px;
      height: 56px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 22px;
      margin: 0 auto 16px;
      transition: 0.3s;
    }
    .step:hover .step-circle {
      transform: scale(1.15);
      box-shadow: 0 0 24px var(--metal-gold);
    }
    @media (max-width: 600px) { .process-steps { flex-direction: column; align-items: center; } }
    /* 案例瀑布流 */
    .showcase-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 20px;
    }
    .showcase-card {
      background: white;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .showcase-img {
      height: 200px;
      overflow: hidden;
    }
    .showcase-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: 0.4s;
    }
    .showcase-card:hover .showcase-img img {
      transform: scale(1.05);
      filter: saturate(1.2);
    }
    .showcase-info {
      padding: 16px;
    }
    .tag-red {
      background: var(--accent-red);
      color: white;
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 600;
    }
    @media (max-width: 768px) { .showcase-grid { grid-template-columns: 1fr 1fr; } }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: #F5F5F7;
      border-radius: 12px;
      margin-bottom: 12px;
      padding: 0 20px;
    }
    .faq-question {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 600;
      padding: 18px 0;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: white;
      margin-left: 28px;
      padding-left: 16px;
      border-left: 3px solid var(--accent-red);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 16px;
    }
    /* CTA */
    #cta {
      background: var(--deep-black);
      position: relative;
      overflow: hidden;
      text-align: center;
      color: white;
    }
    .cta-title {
      font-size: 36px;
      color: var(--metal-gold);
      font-weight: 700;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      justify-content: center;
      margin-top: 28px;
    }
    .btn-outline-gold {
      border: 2px solid var(--metal-gold);
      color: var(--metal-gold);
      padding: 14px 36px;
      border-radius: 40px;
      font-weight: 600;
    }
    .btn-outline-gold:hover {
      background: var(--metal-gold);
      color: black;
    }
    /* Footer */
    #footer {
      background: #0A0F1E;
      color: #B0B3BF;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    .footer-logo {
      font-size: 28px;
      font-weight: 700;
      color: white;
    }
    @media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr 1fr; } }