/* roulang page: index */
:root {
      --primary-deep-green: #0B3B2F;
      --accent-lightning-gold: #F5B042;
      --bg-warm-stone: #F7F5F0;
      --card-white: #FFFFFF;
      --soft-gray-green: #EDF2EF;
      --text-heading: #1A1A1A;
      --text-body: #2E2E2E;
      --text-muted: #5C5C5C;
      --electric-cyan: #00C9A7;
      --border-light: rgba(0,0,0,0.04);
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 12px 32px rgba(0,0,0,0.08);
      --radius-card-sm: 12px;
      --radius-card-lg: 16px;
      --radius-banner: 20px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", system-ui, -apple-system, sans-serif;
      --max-width: 1200px;
      --nav-height: 72px;
      --bottom-nav-height: 56px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm-stone);
      color: var(--text-body);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      display: block;
      max-width: 100%;
      height: auto;
      border-radius: inherit;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.2s ease;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 100;
      height: var(--nav-height);
      background: rgba(247, 245, 240, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--soft-gray-green);
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 22px;
      letter-spacing: 1px;
      color: var(--primary-deep-green);
    }
    .logo-icon {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 34px;
      height: 34px;
      position: relative;
    }
    .logo-icon svg {
      width: 30px;
      height: 30px;
      fill: var(--primary-deep-green);
    }
    .desktop-nav {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-lightning-gold);
      transition: width 0.2s ease;
    }
    .nav-link:hover,
    .nav-link.active {
      color: var(--primary-deep-green);
    }
    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }
    .btn-cta-small {
      background: var(--accent-lightning-gold);
      color: #1A1A1A;
      padding: 8px 18px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 14px;
      border: none;
      cursor: pointer;
      transition: all 0.25s;
      white-space: nowrap;
    }
    .btn-cta-small:hover {
      background: #E09E2F;
      transform: scale(1.03);
      box-shadow: 0 6px 16px rgba(245,176,66,0.3);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--primary-deep-green);
      cursor: pointer;
      padding: 8px;
    }
    .mobile-menu-overlay {
      display: none;
      position: fixed;
      inset: 0;
      background: var(--primary-deep-green);
      z-index: 200;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
    }
    .mobile-menu-overlay.open {
      display: flex;
    }
    .mobile-menu-overlay .nav-link {
      color: var(--bg-warm-stone);
      font-size: 24px;
    }
    .mobile-menu-close {
      position: absolute;
      top: 24px;
      right: 24px;
      background: none;
      border: none;
      font-size: 32px;
      color: var(--bg-warm-stone);
      cursor: pointer;
    }
    .bottom-mobile-nav {
      display: none;
      position: fixed;
      bottom: 12px;
      left: 16px;
      right: 16px;
      height: var(--bottom-nav-height);
      background: var(--primary-deep-green);
      border-radius: 40px;
      box-shadow: 0 8px 24px rgba(0,0,0,0.2);
      z-index: 90;
      padding: 0 24px;
      justify-content: space-around;
      align-items: center;
      backdrop-filter: blur(8px);
    }
    .bottom-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--soft-gray-green);
      font-size: 11px;
      font-weight: 500;
      gap: 3px;
      transition: 0.2s;
    }
    .bottom-nav-item i {
      font-size: 18px;
    }
    .bottom-nav-item.active {
      color: var(--accent-lightning-gold);
    }
    /* Hero */
    .hero {
      padding: 140px 0 80px;
      background-color: var(--bg-warm-stone);
      position: relative;
      overflow: hidden;
    }
    .hero-bg-lines {
      position: absolute;
      inset: 0;
      opacity: 0.05;
      background-image: repeating-linear-gradient(45deg, transparent, transparent 20px, var(--primary-deep-green) 20px, var(--primary-deep-green) 21px);
      pointer-events: none;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
    }
    .hero-text {
      flex: 0 0 55%;
    }
    .hero-badge {
      font-size: 13px;
      letter-spacing: 2px;
      color: var(--electric-cyan);
      font-weight: 600;
      margin-bottom: 16px;
    }
    .hero h1 {
      font-size: 52px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--primary-deep-green);
      letter-spacing: -0.02em;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-body);
      margin-bottom: 32px;
      max-width: 420px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-lightning-gold);
      color: #1A1A1A;
      padding: 14px 32px;
      border-radius: 40px;
      font-weight: 700;
      font-size: 16px;
      border: none;
      cursor: pointer;
      transition: 0.25s;
      box-shadow: 0 4px 12px rgba(245,176,66,0.25);
    }
    .btn-primary:hover {
      background: #E09E2F;
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-deep-green);
      color: var(--primary-deep-green);
      padding: 14px 32px;
      border-radius: 40px;
      font-weight: 600;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: var(--primary-deep-green);
      color: white;
    }
    .hero-image {
      flex: 0 0 45%;
      position: relative;
    }
    .hero-image img {
      border-radius: 0 40px 0 40px;
      width: 100%;
      clip-path: polygon(0% 0%, 100% 0%, 95% 100%, 0% 95%);
    }
    /* 痛点 */
    .pain-points {
      background: var(--card-white);
      padding: 90px 0;
    }
    .pain-grid {
      display: flex;
      gap: 48px;
      justify-content: space-between;
    }
    .pain-item {
      flex: 1;
      position: relative;
      padding-left: 52px;
      border-bottom: 1px solid var(--soft-gray-green);
      padding-bottom: 24px;
    }
    .pain-num {
      position: absolute;
      left: 0;
      top: -8px;
      font-size: 56px;
      font-weight: 700;
      color: var(--accent-lightning-gold);
      opacity: 0.25;
      line-height: 1;
    }
    .pain-item h3 {
      font-size: 22px;
      font-weight: 600;
      color: var(--text-heading);
      margin-bottom: 8px;
    }
    /* 解决方案 */
    .solutions {
      padding: 100px 0;
      background: var(--bg-warm-stone);
    }
    .solution-row {
      display: flex;
      align-items: center;
      gap: 56px;
      margin-bottom: 80px;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-img {
      flex: 0 0 42%;
      border-radius: 16px;
      overflow: hidden;
    }
    .solution-img img {
      border-radius: 16px;
      width: 100%;
    }
    .solution-content {
      flex: 1;
    }
    .solution-content h3 {
      font-size: 28px;
      font-weight: 600;
      color: var(--primary-deep-green);
    }
    .feature-list {
      margin: 20px 0;
      list-style: none;
    }
    .feature-list li {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 8px;
    }
    .feature-list li::before {
      content: "●";
      color: var(--accent-lightning-gold);
      font-size: 20px;
    }
    .text-link {
      color: var(--primary-deep-green);
      font-weight: 600;
      display: inline-block;
      position: relative;
    }
    .text-link::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--electric-cyan);
      transition: width 0.2s;
    }
    .text-link:hover::after {
      width: 100%;
    }
    /* 优势 */
    .advantages {
      background: var(--soft-gray-green);
      border-radius: var(--radius-banner);
      margin: 60px auto;
      padding: 60px 30px;
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
    }
    .stat-item {
      font-size: 42px;
      font-weight: 700;
      color: var(--primary-deep-green);
    }
    .stat-label {
      font-size: 16px;
      color: var(--text-muted);
    }
    .divider {
      width: 1px;
      background: rgba(0,0,0,0.1);
    }
    /* 案例 */
    .cases {
      padding: 80px 0;
      background: var(--card-white);
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card-lg);
      box-shadow: var(--shadow-card);
      margin-bottom: 48px;
      overflow: hidden;
      transition: 0.25s;
    }
    .case-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
      border-bottom: 4px solid var(--accent-lightning-gold);
    }
    .case-img img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
    }
    .case-info {
      padding: 24px;
    }
    .case-tag {
      background: var(--accent-lightning-gold);
      color: #1A1A1A;
      font-size: 12px;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
    }
    /* 证言 */
    .testimonials {
      padding: 80px 0;
    }
    .testimonial-grid {
      display: flex;
      gap: 32px;
    }
    .testimonial-card {
      background: var(--soft-gray-green);
      border-radius: 12px;
      padding: 28px;
      flex: 1;
    }
    /* FAQ */
    .faq {
      padding: 80px 0;
    }
    .faq-item {
      background: white;
      border-left: 4px solid var(--accent-lightning-gold);
      margin-bottom: 16px;
      border-radius: 0 12px 12px 0;
      cursor: pointer;
    }
    .faq-question {
      padding: 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      padding: 0 20px 20px;
      display: none;
      color: var(--text-muted);
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    /* CTA */
    .cta-banner {
      background: var(--primary-deep-green);
      color: var(--bg-warm-stone);
      text-align: center;
      padding: 80px 24px;
      margin-top: 60px;
    }
    .footer {
      background: #072E25;
      color: var(--bg-warm-stone);
      padding: 60px 0 30px;
    }
    @media (max-width: 1024px) {
      .hero h1 { font-size: 42px; }
    }
    @media (max-width: 768px) {
      .desktop-nav { display: none; }
      .hamburger { display: block; }
      .bottom-mobile-nav { display: flex; }
      .hero-grid, .solution-row, .pain-grid, .testimonial-grid { flex-direction: column; }
      .hero-image img { clip-path: none; border-radius: 24px; }
      .advantages { flex-direction: column; gap: 24px; }
      .divider { display: none; }
      .main-header { height: 64px; }
    }
    @media (max-width: 520px) {
      .hero h1 { font-size: 32px; }
      .container { padding: 0 16px; }
    }