/* roulang page: index */
:root {
      --primary: #0A7E8C;
      --primary-glow: rgba(10, 126, 140, 0.6);
      --accent: #F5A623;
      --accent-glow: rgba(245, 166, 35, 0.5);
      --dark-bg: #1A1D22;
      --gray-bg: #F7F9FC;
      --white: #ffffff;
      --text-main: #2C3E50;
      --text-secondary: #5A6D7E;
      --text-light: #A0A6B0;
      --border-light: #DDE2E8;
      --border-card: #EBEEF2;
      --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition: 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
      padding-top: 64px;
    }

    h1, h2, h3, h4 {
      font-weight: 600;
      line-height: 1.4;
    }

    h1 {
      font-size: 2.25rem;
      font-weight: 700;
    }

    h2 {
      font-size: 1.75rem;
      margin-bottom: 1rem;
      letter-spacing: -0.2px;
    }

    h3 {
      font-size: 1.25rem;
      font-weight: 600;
    }

    p {
      color: var(--text-secondary);
      margin-bottom: 0.75rem;
    }

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

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

    .container {
      max-width: 1140px;
      margin: 0 auto;
      padding: 0 24px;
    }

    section {
      padding: 80px 0;
    }

    /* 导航栏 */
    .navbar-custom {
      background-color: var(--dark-bg);
      height: 64px;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      box-shadow: 0 2px 10px rgba(0,0,0,0.08);
      display: flex;
      align-items: center;
    }

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

    .logo-brand {
      font-weight: 700;
      font-size: 1.25rem;
      color: white;
      letter-spacing: 0.5px;
      white-space: nowrap;
    }
    .logo-brand i {
      color: var(--accent);
      margin-right: 6px;
    }

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

    .nav-link-item {
      color: rgba(255,255,255,0.85);
      font-size: 0.9rem;
      font-weight: 500;
      padding: 0.4rem 0;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
    }

    .nav-link-item:hover {
      color: var(--accent);
      border-bottom-color: var(--accent);
    }

    .nav-link-item.active {
      color: white;
      border-bottom: 2px solid var(--primary);
      box-shadow: 0 2px 8px var(--primary-glow);
    }

    .btn-nav-cta {
      background: var(--accent);
      color: var(--dark-bg);
      font-weight: 600;
      padding: 0.5rem 1.5rem;
      border-radius: var(--radius-btn);
      font-size: 0.9rem;
      border: none;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-nav-cta:hover {
      background: #e69600;
      box-shadow: 0 0 12px var(--accent-glow);
      color: #000;
    }

    .navbar-toggler {
      border: none;
      color: white;
      font-size: 1.5rem;
      background: transparent;
    }

    .offcanvas {
      background-color: var(--dark-bg);
      color: white;
    }
    .offcanvas .nav-link-item {
      color: rgba(255,255,255,0.8);
      padding: 0.75rem 1rem;
      border-left: 3px solid transparent;
    }
    .offcanvas .nav-link-item.active {
      border-left: 3px solid var(--primary);
      box-shadow: 0 0 10px var(--primary-glow);
      background: rgba(10,126,140,0.1);
    }

    /* Hero */
    .hero-section {
      background-color: var(--white);
      padding: 60px 0 80px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .hero-text h1 {
      margin-bottom: 1.25rem;
      color: #1a2b3c;
    }
    .hero-subtitle {
      font-size: 1rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
    }
    .btn-primary-custom {
      background: var(--primary);
      color: white;
      font-weight: 600;
      padding: 0.8rem 2.2rem;
      border-radius: var(--radius-btn);
      border: none;
      transition: var(--transition);
    }
    .btn-primary-custom:hover {
      filter: brightness(1.1);
      box-shadow: 0 0 0 3px rgba(10,126,140,0.25);
      color: white;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 20px;
      min-height: 360px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.06);
      animation: float 4s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-8px); }
      100% { transform: translateY(0); }
    }

    /* 特性卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--white);
      padding: 2rem 1.5rem;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: 1px solid var(--border-card);
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 2.2rem;
      color: var(--primary);
      margin-bottom: 1.5rem;
      transition: var(--transition);
    }
    .feature-card:hover .feature-icon {
      color: var(--accent);
      transform: scale(1.05);
    }

    /* 方案对比 */
    .solutions-row {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }
    .plan-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      flex: 1 1 250px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-card);
      position: relative;
      transition: var(--transition);
    }
    .plan-card.recommended {
      border: 2px solid var(--accent);
      box-shadow: 0 8px 28px rgba(245,166,35,0.12);
    }
    .badge-recommend {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--accent);
      color: #1A1D22;
      font-weight: 700;
      font-size: 0.75rem;
      padding: 0.25rem 1rem;
      border-radius: 20px;
    }
    .plan-title {
      font-size: 1.5rem;
      margin-bottom: 1rem;
    }
    .feature-list {
      list-style: none;
      padding: 0;
      margin: 1.5rem 0;
    }
    .feature-list li {
      padding: 0.5rem 0;
      border-bottom: 1px solid #f0f0f0;
      color: var(--text-secondary);
    }
    .feature-list i.fa-check {
      color: var(--primary);
      margin-right: 8px;
    }
    .btn-outline-primary {
      border: 1px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 0.6rem 1.8rem;
      font-weight: 500;
    }
    .btn-outline-primary:hover {
      background: var(--primary);
      color: white;
    }

    /* 案例瀑布流 */
    .masonry-grid {
      columns: 3;
      column-gap: 24px;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .masonry-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .masonry-img {
      width: 100%;
      height: auto;
      object-fit: cover;
      transition: transform 0.3s;
    }
    .masonry-item:hover .masonry-img {
      transform: scale(1.03);
    }
    .masonry-content {
      padding: 1.25rem;
    }
    .tag {
      background: #e9f2f3;
      color: var(--primary);
      font-size: 0.7rem;
      font-weight: 600;
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      display: inline-block;
      margin-right: 6px;
    }

    /* FAQ */
    .accordion-button {
      font-weight: 600;
      background: white;
      box-shadow: none;
    }
    .accordion-button:not(.collapsed) {
      background: #f0f7f8;
      color: var(--primary);
      box-shadow: none;
    }
    .accordion-item {
      border: 1px solid var(--border-light);
      margin-bottom: 12px;
      border-radius: 8px;
    }

    /* CTA */
    .cta-block {
      background: #E8F4F6;
      border-radius: 24px;
      padding: 3rem;
      text-align: center;
    }
    .form-control {
      border-radius: var(--radius-input);
      border: 1px solid var(--border-light);
      padding: 0.7rem 1rem;
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(10,126,140,0.15);
    }

    /* Footer */
    .footer-dark {
      background: var(--dark-bg);
      color: var(--text-light);
      padding: 3rem 0 2rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 2rem;
    }
    .footer-links a {
      display: block;
      color: var(--text-light);
      margin-bottom: 0.5rem;
      font-size: 0.9rem;
    }
    .footer-links a:hover {
      color: var(--accent);
    }

    @media (max-width: 992px) {
      .hero-grid { grid-template-columns: 1fr; }
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .masonry-grid { columns: 2; }
    }
    @media (max-width: 768px) {
      h1 { font-size: 1.9rem; }
      section { padding: 60px 0; }
      .features-grid { grid-template-columns: 1fr; }
      .solutions-row { flex-direction: column; }
      .masonry-grid { columns: 1; }
      .footer-grid { grid-template-columns: 1fr; }
    }