/* roulang page: index */
:root {
      --primary: #E85D04;
      --primary-dark: #c94e00;
      --secondary: #1A1A1A;
      --accent-bg: #2B2B2B;
      --white: #FFFFFF;
      --cool-gray: #F8F9FA;
      --text-primary: #1A1A1A;
      --text-secondary: #6C757D;
      --text-muted: #ADB5BD;
      --border-light: #E9ECEF;
      --success: #2A9D8F;
      --danger: #D62828;
      --radius-sm: 8px;
      --radius-md: 12px;
      --shadow-card: 0 10px 30px -10px rgba(0,0,0,0.08);
      --shadow-btn-hover: 0 4px 15px rgba(232, 93, 4, 0.4);
      --transition: all 0.25s ease-in-out;
      --font-inter: 'Inter', 'Noto Sans SC', -apple-system, sans-serif;
      --container-max: 1280px;
    }

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

    body {
      font-family: var(--font-inter);
      line-height: 1.5;
      background: var(--white);
      color: var(--text-primary);
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    button, input {
      font-family: inherit;
      outline: none;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      backdrop-filter: blur(12px);
      background: rgba(255,255,255,0.75);
      transition: var(--transition);
      border-bottom: 1px solid transparent;
    }

    .navbar.scrolled {
      background: rgba(27, 27, 27, 0.85);
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }

    .navbar .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: 0.05em;
      color: var(--secondary);
      transition: var(--transition);
    }

    .navbar.scrolled .logo {
      color: #fff;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 800;
      transform: skewX(-5deg);
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--secondary);
      transition: var(--transition);
      position: relative;
      padding: 4px 0;
    }

    .navbar.scrolled .nav-links a {
      color: #ddd;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -2px;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }

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

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }

    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--secondary);
      transition: var(--transition);
    }

    .navbar.scrolled .hamburger span {
      background: white;
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 280px;
      height: 100vh;
      background: rgba(20,20,20,0.95);
      backdrop-filter: blur(20px);
      padding: 2rem;
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
      transition: right 0.4s ease;
      z-index: 1001;
    }

    .mobile-menu.open {
      right: 0;
    }

    .mobile-menu a {
      color: white;
      font-size: 1.2rem;
      font-weight: 500;
    }

    /* 区块通用 */
    section {
      padding: 120px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 80px 0;
      }
    }

    /* Hero */
    .hero {
      position: relative;
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      background-blend-mode: overlay;
      background-color: rgba(0,0,0,0.55);
      color: white;
      margin-top: 0;
    }

    .hero .container {
      position: relative;
      z-index: 2;
    }

    .hero h1 {
      font-size: 3.5rem;
      font-weight: 800;
      line-height: 1.1;
      letter-spacing: -0.02em;
      max-width: 700px;
      margin-bottom: 1.5rem;
    }

    .hero .subtitle {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.8);
      max-width: 600px;
      margin-bottom: 2.5rem;
    }

    .btn-group {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }

    .btn {
      display: inline-block;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: var(--transition);
      cursor: pointer;
      text-align: center;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: var(--shadow-btn-hover);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
    }

    .btn-outline:hover {
      background: white;
      color: var(--secondary);
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 24px;
      margin-top: 3rem;
    }

    .pain-card {
      background: var(--cool-gray);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 2rem;
      display: flex;
      gap: 1rem;
      align-items: flex-start;
    }

    .pain-icon {
      color: var(--danger);
      font-size: 2rem;
      font-weight: 700;
    }

    /* 解决方案 */
    .solution-row {
      display: flex;
      gap: 3rem;
      align-items: center;
      margin-bottom: 5rem;
    }

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

    .solution-img {
      flex: 1;
      border-radius: var(--radius-sm);
      overflow: hidden;
    }

    .solution-text {
      flex: 1;
    }

    .link-underline {
      color: var(--primary);
      font-weight: 600;
      position: relative;
    }

    .link-underline::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -2px;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.3s;
    }

    .link-underline:hover::after {
      width: 100%;
    }

    /* 优势 */
    .adv-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 40px;
      margin-top: 3rem;
    }

    .adv-item {
      text-align: left;
    }

    .adv-number {
      font-size: 4rem;
      font-weight: 800;
      color: rgba(232,93,4,0.2);
      line-height: 1;
    }

    /* 数据 */
    .dark-bg {
      background: var(--accent-bg);
      color: white;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
    }

    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--primary);
    }

    /* 证言 */
    .testimonial-card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 2.5rem;
      max-width: 700px;
      margin: 0 auto;
      box-shadow: var(--shadow-card);
      position: relative;
    }

    .quote-icon {
      font-size: 4rem;
      color: var(--primary);
      opacity: 0.3;
      position: absolute;
      top: 10px;
      left: 20px;
    }

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

    .accordion-item {
      border-bottom: 1px solid var(--border-light);
      background: white;
    }

    .accordion-header {
      padding: 1.2rem 0;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      transition: var(--transition);
    }

    .accordion-header:hover {
      color: var(--primary);
    }

    .accordion-body {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: var(--cool-gray);
      padding: 0 1rem;
    }

    /* CTA */
    .cta-section {
      background: url('/assets/images/backpic/back-2.webp') center/cover;
      background-color: rgba(0,0,0,0.7);
      background-blend-mode: overlay;
      text-align: center;
    }

    .btn-xl {
      padding: 18px 42px;
      font-size: 1.2rem;
    }

    /* Footer */
    footer {
      background: #121212;
      color: #ccc;
      padding: 4rem 0 2rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 2rem;
    }

    @media (max-width: 1024px) {
      .pain-grid { grid-template-columns: 1fr; }
      .adv-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero h1 { font-size: 2.5rem; }
      .solution-row, .solution-row.reverse {
        flex-direction: column;
      }
      .stats-grid { grid-template-columns: 1fr; }
      .btn-group { flex-direction: column; align-items: flex-start; }
    }

    h2 {
      font-size: 2.8rem;
      font-weight: 700;
      margin-bottom: 1rem;
      text-align: center;
    }

    .section-subtitle {
      text-align: center;
      color: var(--text-secondary);
      max-width: 650px;
      margin: 0 auto 3rem;
    }