/* roulang page: index */
:root {
      --color-primary: #0A4D3C;
      --color-primary-dark: #052E23;
      --color-accent: #F85E2D;
      --color-accent-hover: #E04A1F;
      --color-gold: #C49A2B;
      --color-bg: #F9F7F4;
      --color-white: #FFFFFF;
      --color-text: #2D2D2D;
      --color-text-light: #6B7280;
      --color-text-on-dark: #FEFCF9;
      --color-border-light: #E5E7EB;
      --radius-card: 24px;
      --radius-mid: 16px;
      --radius-btn: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 2px 16px rgba(5, 46, 35, 0.06);
      --shadow-card-hover: 0 8px 32px rgba(5, 46, 35, 0.12);
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --font-number: 'Inter', 'DIN Alternate', 'PingFang SC', sans-serif;
      --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      --max-width: 1280px;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--color-bg);
      color: var(--color-text);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

    h1, h2, h3, h4 {
      font-family: var(--font-title);
      font-weight: 700;
      color: var(--color-primary-dark);
    }

    h1 {
      font-size: 48px;
      line-height: 1.2;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 36px;
      line-height: 1.3;
      margin-bottom: 16px;
    }

    h3 {
      font-size: 22px;
      line-height: 1.4;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      font-weight: 600;
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition-smooth);
    }

    section {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
      h1 {
        font-size: 32px;
      }
      h2 {
        font-size: 26px;
      }
      h3 {
        font-size: 18px;
      }
    }

    @media (max-width: 480px) {
      h1 {
        font-size: 28px;
      }
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      z-index: 50;
      height: 72px;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 24px;
      color: var(--color-primary);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      color: var(--color-accent);
      font-size: 26px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      font-weight: 500;
      color: var(--color-text);
    }

    .nav-links a {
      position: relative;
      padding: 4px 0;
      color: var(--color-text);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--color-accent);
      transition: width 0.2s ease;
    }

    .nav-links a:hover {
      color: var(--color-accent);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-primary-sm {
      background: var(--color-accent);
      color: white;
      padding: 10px 20px;
      border-radius: var(--radius-btn);
      font-size: 14px;
      font-weight: 600;
    }
    .btn-primary-sm:hover {
      background: var(--color-accent-hover);
      box-shadow: 0 4px 12px rgba(248,94,45,0.3);
    }

    .hamburger {
      display: none;
      font-size: 24px;
      color: var(--color-primary);
      background: none;
      border: none;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 24px;
        box-shadow: 0 8px 20px rgba(0,0,0,0.08);
        gap: 20px;
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
    }

    /* Hero */
    .hero {
      background: radial-gradient(circle at 80% 20%, #0A4D3C, #073B2E);
      color: var(--color-text-on-dark);
      padding: 120px 0 100px;
      margin-top: 72px;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      top: -40%;
      right: -10%;
      width: 80%;
      height: 140%;
      background: radial-gradient(circle at 30% 40%, rgba(196,154,43,0.15) 0%, transparent 70%);
      pointer-events: none;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero-content h1 {
      color: white;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(254,252,249,0.85);
      margin-bottom: 32px;
      max-width: 450px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 36px;
    }
    .btn-primary {
      background: var(--color-accent);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-size: 16px;
    }
    .btn-primary:hover {
      background: var(--color-accent-hover);
      box-shadow: 0 8px 20px rgba(248,94,45,0.4);
    }
    .btn-ghost {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-size: 16px;
    }
    .btn-ghost:hover {
      background: white;
      color: var(--color-primary);
    }
    .badge-group {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }
    .badge-large {
      background: rgba(0,0,0,0.25);
      backdrop-filter: blur(4px);
      padding: 12px 24px;
      border-radius: 16px;
      display: flex;
      align-items: baseline;
      gap: 8px;
    }
    .badge-large .num {
      font-family: var(--font-number);
      font-weight: 800;
      font-size: 32px;
      color: var(--color-gold);
    }
    .badge-large .text {
      font-size: 14px;
      color: rgba(255,255,255,0.8);
    }
    .hero-image {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 32px;
      height: 400px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-image {
        height: 280px;
        order: -1;
      }
    }

    /* 核心优势 2x2 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
      margin-top: 40px;
    }
    .feature-item {
      display: flex;
      gap: 24px;
      padding: 28px 24px;
      background: transparent;
      border-left: 3px solid var(--color-primary);
      transition: var(--transition-smooth);
    }
    .feature-item:hover {
      border-left-color: var(--color-accent);
      background: #E6F4F0;
      border-radius: 0 12px 12px 0;
    }
    .feature-icon {
      font-size: 36px;
      color: var(--color-gold);
      width: 48px;
      text-align: center;
    }
    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 产品卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .product-card {
      background: var(--color-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }
    .product-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-card-hover);
    }
    .card-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .card-badge {
      position: absolute;
      top: 12px;
      right: 12px;
      background: var(--color-accent);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 700;
    }
    .card-body {
      padding: 24px;
    }
    .card-body h3 {
      margin-bottom: 8px;
    }
    .card-body p {
      color: var(--color-text-light);
      margin-bottom: 16px;
    }
    .text-link {
      color: var(--color-primary);
      font-weight: 600;
    }
    @media (max-width: 768px) {
      .cards-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 场景交替 */
    .scene-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
    }
    .scene-row.reverse {
      direction: rtl;
    }
    .scene-row.reverse .scene-text {
      direction: ltr;
    }
    .scene-img {
      background-color: #E6F4F0;
      background-size: cover;
      border-radius: 24px;
      height: 320px;
    }
    @media (max-width: 768px) {
      .scene-row {
        grid-template-columns: 1fr;
        gap: 24px;
        direction: ltr;
      }
      .scene-row.reverse {
        direction: ltr;
      }
    }

    /* 案例滚动 */
    .testimonials-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      padding-bottom: 16px;
      margin-top: 32px;
    }
    .testimonial-card {
      min-width: 300px;
      background: white;
      border-radius: 20px;
      padding: 24px;
      box-shadow: var(--shadow-card);
      scroll-snap-align: start;
    }
    .quote {
      font-style: italic;
      font-size: 18px;
      margin-bottom: 16px;
    }
    .data-badge {
      background: var(--color-accent);
      color: white;
      padding: 6px 14px;
      border-radius: 20px;
      font-weight: 700;
      display: inline-block;
      margin-bottom: 12px;
    }

    /* 流程/方案 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .plan-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      position: relative;
    }
    .plan-card.recommended {
      border-top: 5px solid var(--color-primary);
    }
    .popular-tag {
      background: var(--color-primary);
      color: white;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 12px;
      display: inline-block;
      margin-bottom: 8px;
    }
    @media (max-width: 768px) {
      .pricing-grid {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 32px;
    }
    .faq-item {
      background: white;
      border-radius: 12px;
      padding: 16px 20px;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--color-text-light);
    }
    .faq-item.active .faq-answer {
      max-height: 150px;
      margin-top: 12px;
    }
    @media (max-width: 768px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }

    /* CTA */
    .cta-band {
      background: linear-gradient(135deg, #0A4D3C, #052E23);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    .footer {
      background: #052E23;
      color: #CBD5E1;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }