/* roulang page: index */
:root {
      --ink-black: #1A1A1A;
      --jade-white: #F5F5F0;
      --racing-orange: #FF5A1F;
      --neon-green: #C4F500;
      --gray-light: #EAEAE3;
      --gray-mid: #B0B0B0;
      --white: #FFFFFF;
      
      --font-heading: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "Poppins", sans-serif;
      
      --shadow-card: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-button: 8px;
      --radius-container: 24px;
      --border-light: 1px solid rgba(0,0,0,0.06);
      --border-dark: 1px solid rgba(255,255,255,0.1);
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    html {
      scroll-behavior: smooth;
    }
    
    body {
      font-family: var(--font-body);
      font-size: 16px;
      line-height: 1.7;
      font-weight: 400;
      background-color: var(--jade-white);
      color: var(--ink-black);
      overflow-x: hidden;
    }
    
    h1, h2, h3, .font-heading {
      font-family: var(--font-heading);
      font-weight: 700;
    }
    
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    img {
      max-width: 100%;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }
    
    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(245, 245, 240, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.04);
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }
    
    #header.scrolled {
      background: var(--jade-white);
      box-shadow: 0 2px 16px rgba(0,0,0,0.04);
    }
    
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      padding: 0 40px;
      max-width: 1440px;
      margin: 0 auto;
    }
    
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 22px;
      letter-spacing: 1px;
      color: var(--ink-black);
    }
    
    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--ink-black);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }
    
    .logo-icon::before {
      content: "🐼";
      font-size: 20px;
      filter: grayscale(100%) brightness(10);
    }
    
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    
    .nav-link {
      font-weight: 500;
      font-size: 16px;
      color: var(--ink-black);
      position: relative;
      padding: 4px 0;
    }
    
    .nav-link::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--racing-orange);
      transition: width 0.3s ease;
    }
    
    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }
    
    .btn-capsule {
      background: var(--racing-orange);
      color: white;
      padding: 10px 24px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 15px;
      letter-spacing: 0.5px;
      transition: all 0.25s ease;
      box-shadow: 0 4px 12px rgba(255,90,31,0.3);
    }
    
    .btn-capsule:hover {
      background: #E04A10;
      box-shadow: 0 6px 20px rgba(255,90,31,0.5);
      transform: translateY(-1px);
    }
    
    .hamburger {
      display: none;
      flex-direction: column;
      justify-content: space-between;
      width: 24px;
      height: 18px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    
    .hamburger span {
      width: 100%;
      height: 2px;
      background: var(--ink-black);
      border-radius: 2px;
      transition: 0.3s;
    }
    
    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 280px;
      height: 100vh;
      background: var(--jade-white);
      box-shadow: -4px 0 20px rgba(0,0,0,0.08);
      padding: 32px 24px;
      display: flex;
      flex-direction: column;
      gap: 24px;
      transition: right 0.35s ease;
      z-index: 1100;
    }
    
    .mobile-menu.active {
      right: 0;
    }
    
    .mobile-menu a {
      font-size: 18px;
      font-weight: 600;
      padding: 12px 0;
      border-bottom: 1px solid rgba(0,0,0,0.06);
    }
    
    /* Hero */
    #hero {
      position: relative;
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-attachment: fixed;
      overflow: hidden;
    }
    
    #hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(26,26,26,0.75) 0%, rgba(26,26,26,0.25) 100%);
      z-index: 1;
    }
    
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      color: white;
      padding: 0 24px;
    }
    
    .hero-content h1 {
      font-size: clamp(36px, 5vw, 56px);
      line-height: 1.15;
      margin-bottom: 20px;
      text-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }
    
    .hero-sub {
      font-size: 20px;
      opacity: 0.9;
      margin-bottom: 40px;
      font-weight: 400;
    }
    
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    
    .btn-primary {
      background: var(--racing-orange);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 18px;
      transition: all 0.25s;
      box-shadow: 0 6px 18px rgba(255,90,31,0.4);
    }
    
    .btn-primary:hover {
      background: #E04A10;
      box-shadow: 0 8px 24px rgba(255,90,31,0.55);
      transform: translateY(-2px);
    }
    
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 18px;
      transition: 0.25s;
    }
    
    .btn-outline:hover {
      background: white;
      color: var(--ink-black);
    }
    
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    
    .section-title {
      font-size: clamp(32px, 4vw, 44px);
      text-align: center;
      margin-bottom: 16px;
    }
    
    .section-desc {
      text-align: center;
      max-width: 700px;
      margin: 0 auto 60px;
      color: #555;
    }
    
    /* Services */
    #services {
      background: var(--jade-white);
    }
    
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      border: var(--border-light);
      transition: all 0.3s ease;
      text-align: center;
    }
    
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    
    .service-icon {
      width: 70px;
      height: 70px;
      background: #F0F0E8;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      font-size: 32px;
      color: var(--racing-orange);
    }
    
    .service-card h3 {
      margin-bottom: 12px;
      font-size: 22px;
    }
    
    /* 优势数据 */
    #advantages {
      background: var(--gray-light);
      position: relative;
    }
    
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      text-align: center;
    }
    
    .stat-number {
      font-family: var(--font-number);
      font-size: 52px;
      font-weight: 800;
      color: var(--racing-orange);
      line-height: 1.2;
    }
    
    /* 案例 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
      scrollbar-width: thin;
    }
    
    .case-card {
      min-width: 300px;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: 0.3s;
    }
    
    .case-card:hover {
      transform: translateY(-4px);
    }
    
    .case-img {
      height: 220px;
      background-size: cover;
    }
    
    /* 方案 */
    #solution {
      background: white;
    }
    
    .solution-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 60px;
    }
    
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      padding: 20px 24px;
      cursor: pointer;
    }
    
    /* CTA */
    #cta {
      background: var(--ink-black);
      color: white;
      text-align: center;
    }
    
    /* Footer */
    #footer {
      background: var(--ink-black);
      color: var(--gray-mid);
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    
    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2,1fr); }
    }
    
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .services-grid, .stats-grid, .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .solution-row { flex-direction: column; }
    }