/* roulang page: index */
:root {
      --primary-black: #1E1E1E;
      --primary-gold: #C8A45C;
      --accent-red: #D93A2B;
      --white-track: #F8F6F1;
      --pure-white: #FFFFFF;
      --text-dark: #1E1E1E;
      --text-gray: #555555;
      --text-light-gray: #B0B0B0;
      --border-light: #E6E4DF;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.08);
      --border-radius-card: 12px;
      --border-radius-btn: 8px;
      --transition-base: 0.25s ease;
      --container-max: 1280px;
      --nav-height: 64px;
      --mobile-nav-height: 56px;
      --section-gap: 80px;
      --font-h1: clamp(2.75rem, 6vw, 3.5rem);
      --font-h2: clamp(2rem, 5vw, 2.625rem);
      --font-h3: clamp(1.5rem, 3vw, 1.75rem);
      --font-body: 1rem;
    }

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

    body {
      font-family: 'Segoe UI', '思源黑体', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      background-color: var(--white-track);
      color: var(--text-dark);
      line-height: 1.6;
      font-size: var(--font-body);
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-base);
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: all var(--transition-base);
      font-weight: 600;
    }

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航系统 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: var(--pure-white);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: background 0.3s;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-black);
      letter-spacing: 1px;
    }

    .logo .gold-dot {
      width: 8px;
      height: 8px;
      background: var(--primary-gold);
      border-radius: 2px;
      transform: rotate(45deg);
    }

    .logo-text {
      display: flex;
      align-items: baseline;
      gap: 6px;
    }

    .logo-sub {
      font-size: 0.7rem;
      font-weight: 400;
      color: var(--primary-gold);
      letter-spacing: 1px;
      text-transform: uppercase;
    }

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

    .nav-link {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-dark);
      position: relative;
      padding: 4px 0;
      transition: color var(--transition-base);
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-gold);
      transition: width var(--transition-base);
    }

    .nav-link:hover,
    .nav-link.active {
      color: var(--primary-gold);
    }

    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }

    .burger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      padding: 4px;
      z-index: 1001;
    }

    .burger span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--primary-black);
      transition: all 0.3s;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      margin-top: 0;
      padding-top: var(--nav-height);
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(30,30,30,0.82) 0%, rgba(30,30,30,0.55) 100%);
      z-index: 1;
    }

    .hero .container {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .hero-content {
      color: var(--pure-white);
    }

    .hero h1 {
      font-size: var(--font-h1);
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      color: var(--pure-white);
    }

    .hero .gold-highlight {
      color: var(--primary-gold);
    }

    .hero-sub {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 32px;
      max-width: 480px;
    }

    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .btn-primary {
      background: var(--accent-red);
      color: white;
      padding: 14px 32px;
      border-radius: var(--border-radius-btn);
      font-size: 1rem;
      box-shadow: 0 6px 16px rgba(217,58,43,0.3);
    }

    .btn-primary:hover {
      background: #b83022;
      transform: translateY(-2px);
    }

    .btn-outline-gold {
      border: 2px solid var(--primary-gold);
      color: var(--primary-gold);
      padding: 14px 32px;
      border-radius: var(--border-radius-btn);
      background: transparent;
    }

    .btn-outline-gold:hover {
      background: rgba(200,164,92,0.1);
    }

    .hero-visual {
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .hero-img-placeholder {
      width: 100%;
      max-width: 500px;
      aspect-ratio: 1/1;
      background: rgba(255,255,255,0.06);
      border-radius: 24px;
      backdrop-filter: blur(2px);
      display: flex;
      align-items: center;
      justify-content: center;
      border: 1px solid rgba(255,255,255,0.15);
    }

    /* 通用板块标题 */
    .section {
      padding: var(--section-gap) 0;
    }

    .section-header {
      text-align: center;
      margin-bottom: 48px;
    }

    .section-header h2 {
      font-size: var(--font-h2);
      font-weight: 700;
      color: var(--primary-black);
      margin-bottom: 8px;
    }

    .section-sub {
      color: var(--primary-gold);
      font-size: 0.9rem;
      letter-spacing: 2px;
      text-transform: uppercase;
    }

    /* 优势卡片 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .advantage-card {
      background: var(--pure-white);
      border-radius: var(--border-radius-card);
      padding: 40px 24px;
      text-align: center;
      box-shadow: var(--shadow-card);
      transition: all var(--transition-base);
    }

    .advantage-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-6px);
    }

    .advantage-icon {
      font-size: 2.8rem;
      color: var(--primary-gold);
      margin-bottom: 20px;
    }

    .advantage-card h3 {
      font-size: var(--font-h3);
      margin-bottom: 12px;
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .service-card {
      background: white;
      border-radius: var(--border-radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all var(--transition-base);
    }

    .service-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-6px);
    }

    .service-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }

    .service-body {
      padding: 20px;
    }

    .service-body h3 {
      margin-bottom: 8px;
    }

    .gold-arrow {
      color: var(--primary-gold);
      margin-top: 12px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      font-weight: 600;
    }

    /* 荣誉墙 */
    .data-wall {
      background: var(--primary-black);
      padding: 70px 0;
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      text-align: center;
    }

    .data-item .big-number {
      font-size: 3.5rem;
      font-weight: 800;
      color: var(--primary-gold);
    }

    .data-item p {
      color: #ccc;
      font-size: 1.1rem;
    }

    /* 案例 */
    .case-row {
      display: flex;
      gap: 40px;
      align-items: center;
      margin-bottom: 60px;
    }

    .case-row.reverse {
      flex-direction: row-reverse;
    }

    .case-img {
      flex: 1;
      border-radius: var(--border-radius-card);
      overflow: hidden;
      background-size: cover;
      height: 280px;
    }

    .case-text {
      flex: 1;
    }

    .gold-tag {
      border: 1px solid var(--primary-gold);
      color: var(--primary-gold);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin-bottom: 12px;
    }

    /* 会员方案 */
    .plan-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .plan-card {
      background: white;
      border-radius: 16px;
      padding: 36px 24px;
      text-align: center;
      box-shadow: var(--shadow-card);
      position: relative;
    }

    .plan-card.featured {
      border: 2px solid var(--primary-gold);
    }

    .step-number {
      font-size: 5rem;
      font-weight: 800;
      color: rgba(200,164,92,0.12);
      position: absolute;
      top: 10px;
      left: 20px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 12px;
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
    }

    .faq-question {
      width: 100%;
      padding: 18px 24px;
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      background: none;
      border: none;
    }

    .faq-answer {
      padding: 0 24px 18px;
      display: none;
      color: var(--text-gray);
    }

    .faq-item.open .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-band {
      background: var(--primary-gold);
      padding: 70px 0;
      text-align: center;
    }

    .cta-band h2 {
      font-size: 2.2rem;
      margin-bottom: 16px;
    }

    /* 页脚 */
    .footer {
      background: var(--primary-black);
      color: #B0B0B0;
      padding: 50px 0 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 1024px) {
      .hero .container { grid-template-columns: 1fr; }
      .services-grid, .advantages-grid { grid-template-columns: repeat(2,1fr); }
      .case-row { flex-direction: column; }
      .case-row.reverse { flex-direction: column; }
    }

    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .burger { display: flex; }
      .services-grid, .advantages-grid, .plan-grid, .data-wall, .footer-grid { grid-template-columns: 1fr; }
    }