/* roulang page: index */
:root {
      --deep-bronze: #2E2B23;
      --warm-iron: #3A3530;
      --champagne-gold: #C9A96E;
      --warm-white: #FAF8F5;
      --pale-taupe: #F0EDE8;
      --text-primary: #1F1D1A;
      --text-secondary: #6B625A;
      --text-muted: #9C9388;
      --cta-burgundy: #7A2E3B;
      --cta-burgundy-dark: #621F29;
      --border-light: #E5E0D8;
      --card-shadow: 0 2px 12px rgba(46, 43, 35, 0.06);
      --card-shadow-hover: 0 8px 24px rgba(46, 43, 35, 0.12);
      --radius-md: 12px;
      --radius-sm: 8px;
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --font-heading: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-number: "Inter", "Helvetica Neue", sans-serif;
      --max-width: 1280px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-heading);
      background-color: var(--warm-white);
      color: var(--text-primary);
      line-height: 1.75;
      font-weight: 400;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3 {
      line-height: 1.3;
    }
    h1 {
      font-weight: 700;
      font-size: clamp(2.5rem, 5vw, 4rem);
      letter-spacing: 0.02em;
    }
    h2 {
      font-weight: 600;
      font-size: clamp(1.8rem, 3.5vw, 2.5rem);
      margin-bottom: 1rem;
    }
    h3 {
      font-weight: 600;
      font-size: 1.25rem;
    }
    p {
      color: var(--text-secondary);
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-heading);
      font-weight: 600;
      font-size: 0.95rem;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      background: transparent;
    }
    .btn-primary {
      background-color: var(--cta-burgundy);
      color: white;
      box-shadow: 0 4px 10px rgba(122, 46, 59, 0.2);
    }
    .btn-primary:hover {
      background-color: var(--cta-burgundy-dark);
      transform: scale(1.02);
      box-shadow: 0 6px 16px rgba(122, 46, 59, 0.3);
    }
    .btn-secondary {
      border: 1.5px solid var(--champagne-gold);
      color: var(--champagne-gold);
    }
    .btn-secondary:hover {
      background-color: var(--champagne-gold);
      color: white;
    }
    .btn-gold {
      background-color: var(--champagne-gold);
      color: var(--deep-bronze);
      font-weight: 700;
    }
    .btn-gold:hover {
      background-color: #b8944f;
      color: white;
      transform: scale(1.02);
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(250, 248, 245, 0.9);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-light);
      z-index: 100;
      transition: var(--transition-smooth);
    }
    .header.scrolled {
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }
    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--deep-bronze);
      letter-spacing: 0.05em;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo svg {
      width: 28px;
      height: 28px;
      stroke: var(--champagne-gold);
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--warm-iron);
      position: relative;
      font-size: 0.95rem;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--champagne-gold);
      transition: width 0.3s ease;
    }
    .nav-links a:hover {
      color: var(--champagne-gold);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--deep-bronze);
      transition: var(--transition-smooth);
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: var(--warm-white);
      flex-direction: column;
      padding: 24px;
      gap: 16px;
      border-bottom: 1px solid var(--border-light);
      z-index: 99;
    }
    .mobile-menu a {
      font-size: 1.2rem;
      font-weight: 500;
      color: var(--warm-iron);
    }
    /* Hero */
    .hero {
      padding: 140px 0 80px;
      display: flex;
      align-items: center;
      gap: 48px;
    }
    .hero-content {
      flex: 1;
    }
    .hero-content h1 {
      margin-bottom: 1.5rem;
    }
    .hero-content .subtitle {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      flex: 1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 360px;
      border-radius: var(--radius-md);
      box-shadow: var(--card-shadow);
    }
    section {
      padding: 100px 0;
    }
    .section-header {
      text-align: center;
      margin-bottom: 48px;
    }
    /* 痛点 */
    .problem-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .quote-large {
      font-size: 1.8rem;
      font-weight: 600;
      color: var(--deep-bronze);
    }
    .pain-list {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .pain-item {
      display: flex;
      gap: 12px;
      align-items: flex-start;
    }
    .pain-icon {
      color: var(--cta-burgundy);
      font-weight: 700;
      font-size: 1.4rem;
    }
    /* 方案卡片 */
    .solution-cards {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 32px;
    }
    .solution-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--card-shadow);
      border-top: 4px solid var(--champagne-gold);
      transition: var(--transition-smooth);
    }
    .solution-card:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-4px);
    }
    /* 非对称栅格 */
    .features-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 32px;
    }
    .feature-large {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
    }
    .feature-large img {
      width: 100%;
      height: 240px;
      object-fit: cover;
    }
    .feature-large .content {
      padding: 24px;
    }
    .feature-small-stack {
      display: flex;
      flex-direction: column;
      gap: 32px;
    }
    .feature-small {
      background: white;
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--card-shadow);
    }
    /* 数据看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--champagne-gold);
    }
    /* 证言滑动 */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }
    .testimonial-card {
      min-width: 300px;
      background: white;
      padding: 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--card-shadow);
      border-left: 4px solid var(--champagne-gold);
      scroll-snap-align: start;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      padding: 20px 0;
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      padding-bottom: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }
    /* CTA */
    .cta-band {
      background: var(--deep-bronze);
      text-align: center;
      padding: 80px 24px;
      border-radius: var(--radius-md);
      color: white;
    }
    .footer {
      background: #1F1D1A;
      color: var(--text-muted);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero { flex-direction: column; }
      .problem-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    .fade-in {
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    }
    .fade-in.visible {
      opacity: 1;
      transform: translateY(0);
    }