/* roulang page: index */
:root {
      --primary: #1A5FDC;
      --primary-dark: #0F3D8E;
      --accent: #FF6B35;
      --accent-hover: #E55A2B;
      --success: #10B981;
      --danger: #EF4444;
      --bg: #F8FAFC;
      --card-bg: #FFFFFF;
      --dark-bg: #0F1D36;
      --darker-bg: #0A1628;
      --text-primary: #0A1628;
      --text-body: #334155;
      --text-muted: #64748B;
      --text-light: #E2E8F0;
      --border: #E2E8F0;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 50px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 2px 6px rgba(0,0,0,0.06), 0 8px 24px rgba(26,95,220,0.12);
      --shadow-dark: 0 4px 16px rgba(0,0,0,0.2);
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-data: 'DIN Alternate', 'Bebas Neue', 'PingFang SC', sans-serif;
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      --container: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-body);
      font-weight: 400;
      line-height: 1.8;
      color: var(--text-body);
      background-color: var(--bg);
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input {
      font-family: inherit;
    }

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

    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border);
      transition: var(--transition);
      height: 72px;
      display: flex;
      align-items: center;
    }
    .header.scrolled {
      background: rgba(255,255,255,0.98);
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }
    .nav {
      display: flex;
      width: 100%;
      justify-content: space-between;
      align-items: center;
    }
    .logo {
      font-family: var(--font-title);
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--text-primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
      font-size: 1.2rem;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      font-size: 0.95rem;
      color: var(--text-body);
      font-weight: 500;
      padding: 4px 0;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .nav-cta {
      background: var(--accent);
      color: white !important;
      padding: 10px 22px !important;
      border-radius: var(--radius-btn);
      font-weight: 600 !important;
      border: none !important;
    }
    .nav-cta:hover {
      background: var(--accent-hover);
      box-shadow: 0 4px 16px rgba(255,107,53,0.3);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-primary);
      border-radius: 2px;
      transition: var(--transition);
    }

    .mobile-drawer {
      position: fixed;
      top: 0;
      right: -300px;
      width: 280px;
      height: 100vh;
      background: white;
      box-shadow: -4px 0 20px rgba(0,0,0,0.1);
      z-index: 200;
      display: flex;
      flex-direction: column;
      padding: 32px 24px;
      transition: right 0.3s ease;
    }
    .mobile-drawer.open {
      right: 0;
    }
    .drawer-overlay {
      position: fixed;
      inset: 0;
      background: rgba(0,0,0,0.4);
      z-index: 199;
      display: none;
    }
    .drawer-overlay.show {
      display: block;
    }
    .mobile-drawer a {
      padding: 14px 0;
      font-size: 1.1rem;
      border-bottom: 1px solid var(--border);
      color: var(--text-body);
      font-weight: 500;
    }
    .mobile-drawer .drawer-cta {
      margin-top: auto;
      background: var(--accent);
      color: white;
      text-align: center;
      padding: 14px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
    }

    /* Hero */
    .hero {
      padding: 80px 0 100px;
      background: var(--bg);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-tag {
      display: inline-block;
      font-size: 0.8rem;
      letter-spacing: 2px;
      text-transform: uppercase;
      color: var(--accent);
      font-weight: 600;
      margin-bottom: 16px;
    }
    .hero h1 {
      font-family: var(--font-title);
      font-size: 3rem;
      font-weight: 700;
      color: var(--text-primary);
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 1.1rem;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 6px 20px rgba(255,107,53,0.35);
      transform: scale(1.02);
    }
    .btn-ghost {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
    }
    .btn-ghost:hover {
      background: var(--primary);
      color: white;
    }
    .hero-trust {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-top: 20px;
    }
    .hero-visual {
      position: relative;
    }
    .hero-img {
      border-radius: 24px;
      width: 100%;
      object-fit: cover;
      aspect-ratio: 4/3;
      box-shadow: var(--shadow-hover);
    }
    .hero-badge {
      position: absolute;
      bottom: 20px;
      right: -10px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(4px);
      padding: 16px 20px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      display: flex;
      gap: 24px;
    }
    .badge-num {
      font-family: var(--font-data);
      font-size: 2rem;
      color: var(--primary);
      font-weight: 700;
    }
    .badge-label {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; text-align: center; }
      .hero-visual { margin-top: 30px; }
      .hero-buttons { justify-content: center; }
      .hero-badge { right: 0; }
    }
    @media (max-width: 640px) {
      .hero { padding: 40px 0 60px; }
      .hero h1 { font-size: 2rem; }
      .hero-buttons { flex-direction: column; align-items: center; }
    }

    /* 板块通用 */
    .section {
      padding: 100px 0;
    }
    .section-title {
      font-family: var(--font-title);
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--text-primary);
      text-align: center;
      margin-bottom: 12px;
    }
    .section-sub {
      text-align: center;
      color: var(--text-muted);
      font-size: 1.05rem;
      margin-bottom: 48px;
    }

    @media (max-width: 640px) {
      .section { padding: 60px 0; }
      .section-title { font-size: 1.8rem; }
    }

    /* 痛点区 */
    .pain-list {
      display: flex;
      flex-direction: column;
      gap: 24px;
      max-width: 900px;
      margin: 0 auto;
    }
    .pain-card {
      background: var(--card-bg);
      border: 1px solid var(--border);
      border-radius: var(--radius-card);
      padding: 28px 32px;
      display: flex;
      align-items: center;
      gap: 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      position: relative;
    }
    .pain-card:hover {
      border-left: 4px solid var(--accent);
      box-shadow: var(--shadow-hover);
    }
    .pain-icon {
      width: 60px;
      height: 60px;
      background: #EFF6FF;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.8rem;
      color: var(--primary);
      flex-shrink: 0;
    }
    .pain-tag {
      position: absolute;
      top: 16px;
      right: 20px;
      font-size: 0.7rem;
      background: #FEE2E2;
      color: var(--danger);
      padding: 4px 10px;
      border-radius: 20px;
      font-weight: 600;
    }
    .pain-content h3 {
      font-size: 1.3rem;
      color: var(--text-primary);
      margin-bottom: 6px;
    }
    @media (max-width: 640px) {
      .pain-card { flex-direction: column; text-align: center; }
    }

    /* 解决方案 */
    .solution-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
    }
    .solution-row.reverse {
      direction: rtl;
    }
    .solution-row.reverse > * {
      direction: ltr;
    }
    .solution-img {
      border-radius: var(--radius-card);
      width: 100%;
      aspect-ratio: 16/10;
      object-fit: cover;
      box-shadow: var(--shadow-sm);
    }
    .solution-text h3 {
      font-size: 1.6rem;
      color: var(--text-primary);
      margin-bottom: 12px;
    }
    .solution-list {
      list-style: none;
      margin-top: 16px;
    }
    .solution-list li {
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .solution-list li::before {
      content: "✓";
      color: var(--accent);
      font-weight: 700;
    }
    @media (max-width: 1024px) {
      .solution-row { grid-template-columns: 1fr; }
      .solution-row.reverse { direction: ltr; }
    }

    /* 数据优势 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: linear-gradient(135deg, #F0F6FF, #FFFFFF);
      border-radius: var(--radius-card);
      padding: 32px 20px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .stat-num {
      font-family: var(--font-data);
      font-size: 3.2rem;
      color: var(--primary);
      font-weight: 700;
      transition: var(--transition);
    }
    .stat-card:hover .stat-num {
      color: var(--accent);
    }
    @media (max-width: 1024px) { .stats-grid { grid-template-columns: repeat(2, 1fr); } }
    @media (max-width: 640px) { .stats-grid { grid-template-columns: 1fr; } }

    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .case-card {
      position: relative;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .case-card:hover {
      transform: scale(1.02);
    }
    .case-img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
    }
    .case-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(0,0,0,0.75));
      padding: 24px;
      color: white;
    }
    .case-tag {
      background: var(--accent);
      color: white;
      font-size: 0.7rem;
      padding: 3px 10px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 8px;
    }
    @media (max-width: 640px) { .cases-grid { grid-template-columns: 1fr; } }

    /* 证言 */
    .testimonials {
      background: var(--dark-bg);
      color: white;
    }
    .testimonial-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .testimonial-card {
      background: rgba(255,255,255,0.08);
      border-radius: var(--radius-card);
      padding: 32px;
      position: relative;
    }
    .quote-mark {
      font-size: 3rem;
      color: var(--accent);
      font-family: serif;
      line-height: 1;
    }
    .testimonial-text {
      font-style: italic;
      font-size: 1.05rem;
      margin: 12px 0 16px;
      color: var(--text-light);
    }
    .testimonial-author {
      color: var(--accent);
      font-weight: 600;
    }
    @media (max-width: 640px) { .testimonial-grid { grid-template-columns: 1fr; } }

    /* FAQ */
    .faq-container {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 16px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      font-size: 1.1rem;
      color: var(--text-primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-body);
      padding-left: 28px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
    }
    .faq-arrow {
      transition: transform 0.3s;
    }
    .faq-item.open .faq-arrow {
      transform: rotate(180deg);
    }

    /* CTA */
    .cta-band {
      background: var(--primary);
      padding: 80px 0;
      text-align: center;
      color: white;
      position: relative;
      overflow: hidden;
    }
    .cta-band::before {
      content: "";
      position: absolute;
      inset: 0;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 100" opacity="0.08"><path d="M0 50 Q 50 0 100 50 T 200 50" stroke="white" fill="none" stroke-width="2"/></svg>') repeat;
    }
    .cta-title {
      font-size: 2.2rem;
      font-weight: 700;
      position: relative;
    }
    .cta-sub {
      font-size: 1.1rem;
      opacity: 0.9;
      margin: 16px 0 28px;
      position: relative;
    }
    .btn-light {
      background: var(--accent);
      color: white;
      padding: 18px 48px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1.1rem;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      position: relative;
    }
    .btn-light:hover {
      background: var(--accent-hover);
      box-shadow: 0 8px 24px rgba(0,0,0,0.2);
    }
    .cta-note {
      font-size: 0.85rem;
      opacity: 0.7;
      margin-top: 16px;
      position: relative;
    }

    /* Footer */
    .footer {
      background: var(--darker-bg);
      color: rgba(255,255,255,0.7);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: white;
    }
    .footer a {
      color: rgba(255,255,255,0.65);
      transition: var(--transition);
    }
    .footer a:hover {
      color: var(--accent);
    }
    .footer-copy {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 24px;
      text-align: center;
      font-size: 0.8rem;
      opacity: 0.5;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 480px) {
      .footer-grid { grid-template-columns: 1fr; }
    }