/* roulang page: index */
:root {
      --primary-deep: #0B1E1A;
      --accent-coral: #E85D3A;
      --bg-warm: #F5F3EE;
      --text-dark: #1C1C1C;
      --text-muted: #4A4A4A;
      --card-bg: #FFFFFF;
      --card-border: #E8E5DF;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
      --radius-lg: 16px;
      --radius-pill: 40px;
      --nav-width: 80px;
      --nav-expanded: 220px;
      --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.6;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, h5 {
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.3;
      margin-bottom: 1rem;
    }

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

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

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 左侧竖向导航 - 桌面端 */
    .vertical-nav {
      position: fixed;
      left: 0;
      top: 0;
      height: 100vh;
      width: var(--nav-width);
      background-color: var(--primary-deep);
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 2rem 0;
      z-index: 1050;
      transition: width var(--transition-smooth);
      box-shadow: 2px 0 15px rgba(0,0,0,0.1);
      overflow: hidden;
    }

    .vertical-nav:hover {
      width: var(--nav-expanded);
    }

    .nav-brand {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      margin-bottom: 3rem;
      white-space: nowrap;
      color: #F5F3EE;
      font-weight: 700;
      font-size: 1.2rem;
      padding: 0 1rem;
      width: 100%;
      justify-content: center;
    }

    .vertical-nav:hover .nav-brand {
      justify-content: flex-start;
      padding-left: 1.5rem;
    }

    .nav-brand i {
      font-size: 1.8rem;
      color: var(--accent-coral);
      flex-shrink: 0;
    }

    .nav-brand span {
      display: none;
      opacity: 0;
      transition: opacity 0.2s ease 0.1s;
    }

    .vertical-nav:hover .nav-brand span {
      display: inline;
      opacity: 1;
    }

    .nav-links {
      display: flex;
      flex-direction: column;
      gap: 0.25rem;
      width: 100%;
      padding: 0 0.5rem;
      list-style: none;
      margin: 0;
    }

    .nav-links li {
      width: 100%;
    }

    .nav-links a {
      display: flex;
      align-items: center;
      gap: 1rem;
      color: #A8A8A8;
      padding: 0.8rem 1rem;
      border-radius: 8px;
      transition: all var(--transition-smooth);
      white-space: nowrap;
      font-size: 0.9rem;
      justify-content: center;
      position: relative;
    }

    .vertical-nav:hover .nav-links a {
      justify-content: flex-start;
    }

    .nav-links a i {
      font-size: 1.4rem;
      width: 24px;
      text-align: center;
      flex-shrink: 0;
      color: #A8A8A8;
      transition: color var(--transition-smooth);
    }

    .nav-links a span {
      display: none;
      opacity: 0;
      transition: opacity 0.2s ease 0.1s;
    }

    .vertical-nav:hover .nav-links a span {
      display: inline;
      opacity: 1;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: #F5F3EE;
      background-color: rgba(255,255,255,0.08);
    }

    .nav-links a.active {
      border-left: 3px solid var(--accent-coral);
      background-color: rgba(232,93,58,0.1);
      color: #fff;
    }

    .nav-links a.active i {
      color: var(--accent-coral);
    }

    .nav-links a:hover i {
      color: #F5F3EE;
    }

    /* 主内容区 */
    .main-content {
      margin-left: var(--nav-width);
      min-height: 100vh;
      transition: margin-left var(--transition-smooth);
    }

    /* 移动端导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background-color: var(--primary-deep);
      z-index: 1060;
      padding: 0.8rem 1.5rem;
      box-shadow: 0 2px 10px rgba(0,0,0,0.2);
      align-items: center;
      justify-content: space-between;
    }

    .mobile-brand {
      color: #F5F3EE;
      font-weight: 700;
      font-size: 1.3rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .mobile-brand i {
      color: var(--accent-coral);
      font-size: 1.6rem;
    }

    .hamburger {
      background: none;
      border: none;
      color: #F5F3EE;
      font-size: 1.8rem;
      cursor: pointer;
      padding: 0.5rem;
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(11, 30, 26, 0.97);
      backdrop-filter: blur(10px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2rem;
      z-index: 1055;
      transform: translateX(-100%);
      transition: transform 0.4s ease;
    }

    .mobile-menu.open {
      transform: translateX(0);
    }

    .mobile-menu a {
      color: #F5F3EE;
      font-size: 1.4rem;
      font-weight: 600;
      border-bottom: 2px solid transparent;
      padding: 0.5rem 0;
      transition: all 0.2s;
    }

    .mobile-menu a:hover,
    .mobile-menu a.active-mobile {
      color: var(--accent-coral);
      border-bottom-color: var(--accent-coral);
    }

    .close-menu {
      position: absolute;
      top: 1.5rem;
      right: 1.5rem;
      background: none;
      border: none;
      color: #F5F3EE;
      font-size: 2rem;
      cursor: pointer;
    }

    /* Hero */
    .hero-section {
      height: 100vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      color: #F5F3EE;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(11,30,26,0.85) 0%, rgba(11,30,26,0.3) 100%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }

    .hero-title {
      font-size: clamp(2.5rem, 5vw, 4.2rem);
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      animation: fadeInUp 0.8s ease forwards;
    }

    .hero-sub {
      font-size: 1.25rem;
      font-weight: 400;
      color: #E0E0E0;
      margin-bottom: 2.5rem;
    }

    @keyframes fadeInUp {
      from { opacity: 0; transform: translateY(30px); }
      to { opacity: 1; transform: translateY(0); }
    }

    .btn-coral {
      background-color: var(--accent-coral);
      color: white;
      border-radius: var(--radius-pill);
      padding: 0.9rem 2.5rem;
      font-weight: 600;
      border: none;
      transition: all var(--transition-smooth);
      display: inline-block;
      text-align: center;
      font-size: 1.1rem;
    }

    .btn-coral:hover {
      background-color: #C94A2E;
      transform: scale(1.03);
      color: white;
      box-shadow: 0 8px 25px rgba(232,93,58,0.4);
    }

    .btn-outline-dark-custom {
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      border-radius: var(--radius-pill);
      padding: 0.8rem 2.2rem;
      font-weight: 600;
      background: transparent;
      transition: all var(--transition-smooth);
    }

    .btn-outline-dark-custom:hover {
      background-color: var(--primary-deep);
      color: white;
    }

    .hero-link {
      color: #F5F3EE;
      text-decoration: underline;
      margin-left: 1.5rem;
      font-weight: 500;
      transition: color 0.2s;
    }

    .hero-link:hover {
      color: var(--accent-coral);
    }

    /* 区块通用 */
    .section-padding {
      padding: 100px 0;
    }

    .section-title {
      font-size: 2.5rem;
      margin-bottom: 1rem;
      color: var(--primary-deep);
    }

    .section-desc {
      color: var(--text-muted);
      font-size: 1.15rem;
      max-width: 700px;
      margin-bottom: 3rem;
    }

    /* 核心优势 - 不对称布局 */
    .features-grid {
      display: flex;
      gap: 2rem;
      align-items: stretch;
    }

    .feature-left {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 2rem;
    }

    .feature-right {
      flex: 1;
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 2.5rem;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--card-border);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      text-align: center;
      transition: all var(--transition-smooth);
    }

    .feature-right:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .feature-item {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--card-border);
      display: flex;
      gap: 1.5rem;
      align-items: flex-start;
      transition: all var(--transition-smooth);
    }

    .feature-item:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .feature-icon {
      font-size: 2.2rem;
      color: var(--accent-coral);
      background: rgba(232,93,58,0.08);
      width: 60px;
      height: 60px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      flex-shrink: 0;
    }

    /* 功能分组卡片 */
    .capability-row {
      display: flex;
      gap: 2rem;
      margin-bottom: 3rem;
      align-items: center;
    }

    .capability-img {
      flex: 0 0 40%;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .capability-text {
      flex: 1;
      padding: 1rem;
    }

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

    /* 场景卡片 */
    .scenario-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--card-border);
      transition: all var(--transition-smooth);
    }

    .scenario-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .scenario-img img {
      transition: transform 0.4s ease;
    }

    .scenario-card:hover .scenario-img img {
      transform: scale(1.03);
    }

    /* 案例卡片 */
    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      border-left: 5px solid var(--accent-coral);
      transition: all var(--transition-smooth);
    }

    .case-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    /* 定价卡 */
    .pricing-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 2.5rem;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--card-border);
      text-align: center;
      transition: all var(--transition-smooth);
    }

    .pricing-card.recommended {
      border: 2px solid var(--accent-coral);
      position: relative;
      transform: scale(1.02);
    }

    .pricing-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-6px);
    }

    /* FAQ */
    .accordion-faq .accordion-item {
      border: none;
      border-bottom: 1px solid var(--card-border);
      background: transparent;
      margin-bottom: 0.5rem;
    }

    .accordion-faq .accordion-button {
      font-weight: 600;
      font-size: 1.2rem;
      color: var(--primary-deep);
      background: transparent;
      box-shadow: none;
      padding: 1.2rem 0;
    }

    .accordion-faq .accordion-button:not(.collapsed) {
      color: var(--accent-coral);
      background: transparent;
    }

    .accordion-faq .accordion-button::after {
      transition: transform 0.3s ease;
    }

    /* CTA 脉冲 */
    .pulse-animation {
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(232,93,58,0.5); }
      70% { box-shadow: 0 0 0 15px rgba(232,93,58,0); }
      100% { box-shadow: 0 0 0 0 rgba(232,93,58,0); }
    }

    /* Footer */
    .footer-custom {
      background-color: var(--primary-deep);
      color: #A8A8A8;
      padding: 2.5rem 0;
    }

    .footer-custom a:hover {
      color: var(--accent-coral);
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .features-grid {
        flex-direction: column;
      }
      .capability-row, .capability-reverse {
        flex-direction: column;
      }
    }

    @media (max-width: 768px) {
      .vertical-nav {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
      .main-content {
        margin-left: 0;
        padding-top: 70px;
      }
      .section-padding {
        padding: 60px 0;
      }
      .hero-section {
        height: 90vh;
        text-align: center;
      }
      .hero-content {
        text-align: center;
      }
      .section-title {
        font-size: 2rem;
      }
    }