/* roulang page: index */
:root {
      --gold: #C9A84C;
      --gold-hover: #B8942E;
      --gold-light: #F9F3E0;
      --deep-blue: #1A1A2E;
      --red: #E63946;
      --red-hover: #C5303C;
      --warm-bg: #F5F3EF;
      --white: #FFFFFF;
      --text-dark: #1A1A2E;
      --text-muted: #5A5A6E;
      --border-light: #E2E0DB;
      --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.06);
      --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-sm: 6px;
      --font-h1: clamp(2.8rem, 8vw, 3.5rem);
      --font-h2: clamp(2rem, 5vw, 2.5rem);
      --font-h3: clamp(1.4rem, 3vw, 1.6rem);
      --font-body: 1rem;
      --font-small: 0.875rem;
      --max-width: 1280px;
      --transition: all 0.3s ease;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      background-color: var(--warm-bg);
      color: var(--text-dark);
      line-height: 1.8;
      font-size: var(--font-body);
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }
    
    /* 排版辅助 */
    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.3;
    }
    
    a {
      text-decoration: none;
      color: inherit;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 2px 10px rgba(0,0,0,0.04);
      z-index: 1000;
      transition: var(--transition);
      padding: 0.8rem 0;
    }
    
    .navbar.scrolled {
      background: rgba(255,255,255,0.98);
      box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    }
    
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }
    
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--deep-blue);
    }
    .logo span {
      color: var(--gold);
    }
    
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-dark);
      position: relative;
      padding: 0.25rem 0;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--gold);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--gold);
      transition: width 0.3s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    
    .btn-nav {
      background: var(--red);
      color: white !important;
      padding: 0.6rem 1.5rem;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: background 0.2s;
    }
    .btn-nav:hover {
      background: var(--red-hover);
    }
    
    .hamburger {
      display: none;
      font-size: 1.8rem;
      cursor: pointer;
      color: var(--deep-blue);
    }
    
    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        justify-content: center;
        gap: 2.5rem;
        box-shadow: -5px 0 25px rgba(0,0,0,0.15);
        transition: right 0.4s ease;
      }
      .nav-links.active {
        right: 0;
      }
      .hamburger {
        display: block;
        z-index: 1001;
      }
      .btn-nav {
        background: var(--gold);
        color: var(--deep-blue) !important;
      }
    }
    
    /* Hero 全屏 */
    .hero {
      background: linear-gradient(0deg, rgba(26,26,46,0.75) 0%, rgba(26,26,46,0.4) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      color: white;
      padding: 0 20px;
      margin-top: 70px;
    }
    
    .hero-content {
      max-width: 900px;
    }
    .hero h1 {
      font-size: var(--font-h1);
      font-weight: 800;
      background: linear-gradient(135deg, #C9A84C, #F5D76E);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1.5rem;
      line-height: 1.2;
    }
    .hero .subtitle {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.9);
      margin-bottom: 2.5rem;
    }
    .hero-buttons {
      display: flex;
      gap: 1rem;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn {
      display: inline-block;
      padding: 0.9rem 2.2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      text-align: center;
      cursor: pointer;
      border: 2px solid transparent;
      font-size: 1rem;
    }
    .btn-outline {
      border-color: var(--gold);
      color: var(--gold);
      background: transparent;
    }
    .btn-outline:hover {
      background: var(--gold);
      color: var(--deep-blue);
    }
    .btn-primary {
      background: var(--red);
      color: white;
      border-color: var(--red);
    }
    .btn-primary:hover {
      background: var(--red-hover);
      border-color: var(--red-hover);
    }
    
    /* 通用板块 */
    section {
      padding: 90px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 3.5rem;
    }
    .section-title h2 {
      font-size: var(--font-h2);
      color: var(--deep-blue);
      margin-bottom: 0.75rem;
    }
    .section-title p {
      color: var(--text-muted);
      max-width: 650px;
      margin: 0 auto;
    }
    
    /* 核心优势网格 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
    }
    .adv-card {
      background: var(--white);
      padding: 2rem 1.5rem;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }
    .adv-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .icon-circle {
      width: 70px;
      height: 70px;
      background: var(--gold-light);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 1.5rem;
      font-size: 2rem;
      color: var(--gold);
      transition: var(--transition);
    }
    .adv-card:hover .icon-circle {
      background: var(--gold);
      color: white;
    }
    .adv-card h3 {
      margin-bottom: 0.8rem;
    }
    
    /* 服务体系 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .service-card {
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
    }
    .service-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .service-text {
      padding: 1.8rem;
    }
    .service-text h3 {
      margin-bottom: 0.5rem;
    }
    .link-gold {
      color: var(--gold);
      font-weight: 600;
      display: inline-block;
      margin-top: 0.8rem;
      border-bottom: 1px solid transparent;
    }
    .link-gold:hover {
      border-bottom-color: var(--gold);
    }
    
    /* 数据深色区 */
    .data-section {
      background: var(--deep-blue);
      color: white;
      text-align: center;
    }
    .data-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
    }
    .data-item .number {
      font-size: 3.2rem;
      font-weight: 800;
      color: var(--gold);
      margin-bottom: 0.3rem;
    }
    
    /* 解决方案交替 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 4rem;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-img, .solution-content {
      flex: 1;
    }
    .solution-img img {
      border-radius: var(--radius-card);
      width: 100%;
      object-fit: cover;
    }
    .tag {
      background: var(--red);
      color: white;
      padding: 0.25rem 1rem;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin-bottom: 1rem;
    }
    
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--white);
      border-radius: var(--radius-sm);
      margin-bottom: 0.8rem;
      border-left: 4px solid transparent;
      transition: var(--transition);
      box-shadow: 0 2px 8px rgba(0,0,0,0.03);
    }
    .faq-item.active {
      border-left-color: var(--gold);
      background: #FFFDF7;
    }
    .faq-question {
      padding: 1.2rem 1.8rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      font-size: 1.1rem;
    }
    .faq-answer {
      padding: 0 1.8rem 1.2rem;
      display: none;
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    
    /* CTA */
    .cta-band {
      background: var(--deep-blue);
      text-align: center;
      padding: 80px 20px;
      color: white;
    }
    .btn-large {
      background: var(--gold);
      color: var(--deep-blue);
      font-weight: 700;
      padding: 1rem 2.8rem;
      font-size: 1.2rem;
      border-radius: var(--radius-btn);
      margin-top: 2rem;
      display: inline-block;
      transition: var(--transition);
    }
    .btn-large:hover {
      background: var(--gold-hover);
      transform: translateY(-3px);
      box-shadow: 0 10px 20px rgba(0,0,0,0.3);
    }
    
    /* 页脚 */
    .footer {
      background: #0F0F1A;
      color: #ccc;
      padding: 50px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
      margin-bottom: 2rem;
    }
    .footer h4 {
      color: white;
      margin-bottom: 1rem;
    }
    .social-icons i {
      font-size: 1.4rem;
      margin-right: 1rem;
      color: var(--gold);
      border: 1px solid var(--gold);
      border-radius: 50%;
      padding: 8px;
      transition: 0.2s;
    }
    .social-icons i:hover {
      background: var(--gold);
      color: var(--deep-blue);
    }
    
    @media (max-width: 1024px) {
      .advantages-grid { grid-template-columns: repeat(2, 1fr); }
      .services-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .advantages-grid, .services-grid, .data-grid { grid-template-columns: 1fr; }
      .solution-row { flex-direction: column; }
      .solution-row.reverse { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero h1 { font-size: 2.4rem; }
    }