/* roulang page: index */
:root {
      --primary: #F15A24;
      --primary-deep: #D1441A;
      --primary-light: #FFF3ED;
      --dark: #1E1E1E;
      --white: #FFFFFF;
      --gray-bg: #FAFAFA;
      --gray-card: #F0F0F0;
      --gold: #F7B731;
      --green: #20BF6B;
      --border-light: #E8E8E8;
      --border-input: #D9D9D9;
      --text-main: #1E1E1E;
      --text-secondary: #5A5A5A;
      --text-muted: #8A8A8A;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
      --shadow-nav: 0 4px 20px rgba(0,0,0,0.06);
      --radius-lg: 12px;
      --radius-md: 8px;
      --radius-pill: 20px;
      --font-title: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--gray-bg);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-title);
      font-weight: 700;
      line-height: 1.3;
    }
    h2 {
      font-size: 2.25rem;
      margin-bottom: 1rem;
      letter-spacing: -0.5px;
    }
    h3 {
      font-size: 1.5rem;
      margin-bottom: 0.75rem;
    }
    p {
      color: var(--text-secondary);
      margin-bottom: 1rem;
    }
    a {
      color: var(--primary);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: var(--primary-deep);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 1rem;
      letter-spacing: 0.5px;
      transition: var(--transition);
      cursor: pointer;
      border: none;
      line-height: 1.2;
      text-align: center;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--primary-deep));
      color: white;
      box-shadow: 0 4px 14px rgba(241,90,36,0.3);
    }
    .btn-primary:hover {
      background: var(--primary-deep);
      box-shadow: 0 8px 22px rgba(241,90,36,0.4);
      transform: translateY(-1px);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background: var(--primary-light);
      border-color: var(--primary-deep);
      color: var(--primary-deep);
    }
    .btn-sm {
      padding: 8px 20px;
      font-size: 0.9rem;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(8px);
      z-index: 1000;
      transition: box-shadow 0.3s ease;
    }
    .site-header.scrolled {
      box-shadow: var(--shadow-nav);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--dark);
      text-decoration: none;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--primary), var(--gold));
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: bold;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-links a {
      color: var(--dark);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 5px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--dark);
      transition: var(--transition);
      display: block;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(20px);
      padding: 2rem;
      flex-direction: column;
      gap: 1.5rem;
      box-shadow: var(--shadow-md);
      transform: translateY(-10px);
      opacity: 0;
      transition: all 0.3s ease;
    }
    .mobile-menu.active {
      display: flex;
      transform: translateY(0);
      opacity: 1;
    }
    .mobile-menu a {
      font-size: 1.2rem;
      font-weight: 600;
      color: var(--dark);
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
    }

    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section { padding: 70px 0; }
    }

    /* Hero */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      margin-top: 40px;
    }
    .hero-content h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero-highlight {
      color: var(--primary);
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
    }
    .trust-badge {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-top: 1.5rem;
      color: var(--text-muted);
      font-size: 0.95rem;
    }
    .trust-badge i {
      color: var(--green);
    }
    .hero-image {
      position: relative;
    }
    .hero-image img {
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-md);
      width: 100%;
      object-fit: cover;
    }
    @media (max-width: 768px) {
      .hero-grid { grid-template-columns: 1fr; gap: 30px; }
      .hero-content h1 { font-size: 2.2rem; }
    }

    /* 卡片通用 */
    .card {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 2rem;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .accent-bar {
      width: 4px;
      height: 28px;
      background: var(--primary);
      border-radius: 2px;
      margin-right: 12px;
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 2rem;
    }
    @media (max-width: 768px) {
      .pain-grid { grid-template-columns: 1fr; }
    }

    /* 解决方案 */
    .solution-grid {
      display: grid;
      grid-template-columns: 1fr 1fr 1.2fr;
      gap: 24px;
      margin-top: 2rem;
    }
    .solution-left {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      grid-column: span 2;
    }
    .solution-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 1.8rem;
      border-left: 4px solid var(--primary);
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }
    .solution-card:hover {
      border-left-width: 8px;
      box-shadow: var(--shadow-md);
    }
    .solution-image img {
      border-radius: var(--radius-lg);
      height: 100%;
      object-fit: cover;
      box-shadow: var(--shadow-md);
      width: 100%;
    }
    @media (max-width: 1024px) {
      .solution-grid { grid-template-columns: 1fr; }
      .solution-left { grid-column: span 1; }
      .solution-image img { height: 280px; }
    }
    @media (max-width: 600px) {
      .solution-left { grid-template-columns: 1fr; }
    }

    /* 数据 */
    .stats-band {
      background: var(--gray-card);
      border-radius: var(--radius-lg);
      padding: 3rem 2rem;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 20px;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary), var(--primary-deep));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    @media (max-width: 768px) {
      .stats-band { grid-template-columns: 1fr 1fr; }
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: white;
      padding: 2rem;
      border-radius: var(--radius-lg);
      position: relative;
      box-shadow: var(--shadow-sm);
    }
    .quote-mark {
      font-size: 3rem;
      color: rgba(241,90,36,0.2);
      line-height: 1;
    }
    @media (max-width: 768px) {
      .testimonial-grid { grid-template-columns: 1fr; }
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 2rem auto 0;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.2rem 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 1.1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 150px;
      margin-top: 10px;
    }

    /* 联系 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: white;
      border-radius: var(--radius-lg);
      padding: 3rem;
      box-shadow: var(--shadow-sm);
    }
    .contact-form input, .contact-form textarea {
      width: 100%;
      padding: 12px;
      border: 1px solid var(--border-input);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      font-family: inherit;
      transition: border 0.2s;
    }
    .contact-form input:focus, .contact-form textarea:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(241,90,36,0.1);
    }
    @media (max-width: 768px) {
      .contact-grid { grid-template-columns: 1fr; padding: 1.5rem; }
    }

    footer {
      background: var(--dark);
      color: #ccc;
      padding: 4rem 0 2rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    footer a {
      color: #ccc;
    }
    footer a:hover {
      color: var(--primary);
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }