/* roulang page: index */
:root {
      --primary: #0284c7;
      --primary-hover: #0369a1;
      --primary-light: #e0f2fe;
      --secondary: #0f766e;
      --accent: #f97316;
      --accent-hover: #ea580c;
      --dark: #0f172a;
      --dark-card: #1e293b;
      --slate: #334155;
      --slate-muted: #64748b;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --border: #e2e8f0;
      --border-light: #f1f5f9;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --shadow-md: 0 4px 20px -2px rgba(2, 132, 199, 0.08), 0 2px 6px -1px rgba(0,0,0,0.04);
      --shadow-lg: 0 12px 32px -4px rgba(15, 23, 42, 0.12);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --radius-full: 9999px;
      --font-base: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
      background-color: var(--bg-page);
    }

    body {
      font-family: var(--font-base);
      color: var(--slate);
      line-height: 1.65;
      background: var(--bg-page);
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.2s ease;
    }

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

    button, input, select, textarea {
      font-family: inherit;
      font-size: 1rem;
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    .section {
      padding: 85px 0;
      position: relative;
      scroll-margin-top: 80px;
    }

    .section-alt {
      background-color: #ffffff;
      border-top: 1px solid var(--border-light);
      border-bottom: 1px solid var(--border-light);
    }

    .section-dark {
      background: linear-gradient(135deg, #091e3a 0%, #031427 100%);
      color: #f8fafc;
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 5px 14px;
      font-size: 0.85rem;
      font-weight: 600;
      border-radius: var(--radius-full);
      background-color: var(--primary-light);
      color: var(--primary);
    }

    .badge-accent {
      background-color: #ffedd5;
      color: var(--accent);
    }

    .badge-dark {
      background-color: rgba(255,255,255,0.12);
      color: #38bdf8;
      border: 1px solid rgba(56, 189, 248, 0.3);
    }

    .section-title {
      font-size: 2.15rem;
      font-weight: 800;
      color: var(--dark);
      line-height: 1.3;
      margin-top: 12px;
      margin-bottom: 16px;
    }

    .section-dark .section-title {
      color: #ffffff;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--slate-muted);
      max-width: 780px;
      line-height: 1.75;
      margin-bottom: 48px;
    }

    .section-dark .section-desc {
      color: #94a3b8;
    }

    .text-center {
      text-align: center;
    }
    .text-center .section-desc {
      margin-left: auto;
      margin-right: auto;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 13px 28px;
      font-size: 1rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(2, 132, 199, 0.35);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(2, 132, 199, 0.45);
    }

    .btn-accent {
      background-color: var(--accent);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(249, 115, 22, 0.35);
    }
    .btn-accent:hover {
      background-color: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(249, 115, 22, 0.45);
    }

    .btn-outline {
      border-color: #cbd5e1;
      color: var(--slate);
      background-color: #ffffff;
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: var(--primary-light);
    }

    .btn-dark-outline {
      border-color: rgba(255,255,255,0.25);
      color: #ffffff;
      background-color: rgba(255,255,255,0.05);
    }
    .btn-dark-outline:hover {
      background-color: rgba(255,255,255,0.15);
      border-color: #38bdf8;
    }

    /* TOPBAR & NAV */
    .topbar {
      background-color: #042940;
      color: #cbd5e1;
      font-size: 0.825rem;
      padding: 7px 0;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .topbar-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .topbar-left, .topbar-right {
      display: flex;
      gap: 20px;
      align-items: center;
    }
    .topbar-tag {
      background: rgba(14, 165, 233, 0.2);
      color: #38bdf8;
      padding: 2px 8px;
      border-radius: 4px;
      font-size: 0.75rem;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--dark);
    }
    .brand-icon {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
      color: #fff;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 1.1rem;
      box-shadow: 0 2px 8px rgba(2, 132, 199, 0.35);
    }
    .nav-links {
      display: flex;
      list-style: none;
      gap: 28px;
      align-items: center;
    }
    .nav-link {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--slate);
      position: relative;
      padding: 8px 0;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--primary);
      border-radius: 2px;
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--dark);
      cursor: pointer;
    }

    /* SECTION 01: HERO (众筹预热/阶梯档位蓝图) */
    .hero-section {
      padding: 70px 0 85px;
      background: linear-gradient(180deg, #f0f9ff 0%, #ffffff 100%);
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid var(--border);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 48px;
      align-items: center;
    }
    .hero-h1 {
      font-size: 2.75rem;
      font-weight: 800;
      color: var(--dark);
      line-height: 1.25;
      margin-top: 14px;
      margin-bottom: 18px;
      letter-spacing: -0.02em;
    }
    .hero-desc {
      font-size: 1.1rem;
      color: #475569;
      line-height: 1.8;
      margin-bottom: 28px;
    }
    .crowd-progress-box {
      background: #ffffff;
      border: 1px solid #bae6fd;
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-md);
      margin-bottom: 28px;
    }
    .crowd-meta {
      display: flex;
      justify-content: space-between;
      margin-bottom: 12px;
      align-items: baseline;
    }
    .crowd-stat-val {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--primary);
    }
    .crowd-stat-lbl {
      font-size: 0.85rem;
      color: var(--slate-muted);
    }
    .progress-bar-bg {
      height: 10px;
      background-color: #e2e8f0;
      border-radius: var(--radius-full);
      overflow: hidden;
      margin-bottom: 12px;
    }
    .progress-bar-fill {
      height: 100%;
      width: 94.6%;
      background: linear-gradient(90deg, #0ea5e9, #0284c7);
      border-radius: var(--radius-full);
    }
    .crowd-stats-sub {
      display: flex;
      justify-content: space-between;
      font-size: 0.85rem;
      color: var(--slate);
      font-weight: 500;
    }
    .hero-btn-group {
      display: flex;
      gap: 16px;
      align-items: center;
    }

    /* 档位卡片（右侧预热档位） */
    .tier-stack {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .tier-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 20px;
      transition: all 0.3s ease;
      position: relative;
      box-shadow: var(--shadow-sm);
    }
    .tier-card:hover {
      border-color: var(--primary);
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }
    .tier-card.featured {
      border: 2px solid var(--primary);
      background: #fdfefe;
    }
    .tier-tag {
      position: absolute;
      top: -10px;
      right: 20px;
      background: var(--accent);
      color: #fff;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 2px 10px;
      border-radius: var(--radius-full);
    }
    .tier-title-row {
      display: flex;
      justify-content: space-between;
      align-items: baseline;
      margin-bottom: 6px;
    }
    .tier-name {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--dark);
    }
    .tier-price {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary);
    }
    .tier-desc {
      font-size: 0.875rem;
      color: var(--slate-muted);
      line-height: 1.5;
    }

    /* 通用卡片与网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: all 0.3s ease;
      box-shadow: var(--shadow-sm);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #bae6fd;
    }

    /* SECTION 02: 架构 */
    .arch-wrapper {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 40px;
      align-items: center;
    }
    .arch-media {
      position: relative;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border);
    }
    .arch-specs {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-top: 24px;
    }
    .spec-item {
      background: var(--bg-page);
      border-radius: 8px;
      padding: 14px 18px;
      border: 1px solid var(--border-light);
    }
    .spec-val {
      font-size: 1.2rem;
      font-weight: 800;
      color: var(--secondary);
    }
    .spec-lbl {
      font-size: 0.825rem;
      color: var(--slate-muted);
    }

    /* SECTION 03: 优势矩阵 */
    .adv-icon-box {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.25rem;
      margin-bottom: 18px;
    }

    /* SECTION 04: 核心模块 */
    .module-card {
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      overflow: hidden;
      background: #ffffff;
      box-shadow: var(--shadow-sm);
    }
    .module-img {
      height: 190px;
      object-fit: cover;
      width: 100%;
    }
    .module-body {
      padding: 24px;
    }
    .module-list {
      list-style: none;
      margin-top: 14px;
    }
    .module-list li {
      position: relative;
      padding-left: 20px;
      font-size: 0.9rem;
      color: var(--slate);
      margin-bottom: 8px;
    }
    .module-list li::before {
      content: "✔";
      position: absolute;
      left: 0;
      color: var(--primary);
      font-size: 0.8rem;
    }

    /* SECTION 05: 深色泳馆数字化看板 */
    .dark-metrics-board {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      align-items: center;
    }
    .board-card {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-md);
      padding: 24px;
      backdrop-filter: blur(8px);
    }
    .lane-status-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 10px;
      margin-top: 16px;
    }
    .lane-node {
      background: rgba(2, 132, 199, 0.15);
      border: 1px solid rgba(56, 189, 248, 0.3);
      padding: 10px 8px;
      border-radius: 6px;
      text-align: center;
      font-size: 0.75rem;
    }
    .lane-node.busy {
      background: rgba(249, 115, 22, 0.15);
      border-color: rgba(249, 115, 22, 0.4);
      color: #fed7aa;
    }

    /* SECTION 06: 用户案例与落地场景 */
    .scenario-card {
      display: flex;
      flex-direction: column;
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border);
    }
    .scenario-img {
      height: 200px;
      object-fit: cover;
      width: 100%;
    }
    .scenario-content {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }

    /* SECTION 07: 效能数据条 */
    .stats-strip-container {
      background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
      border-radius: var(--radius-lg);
      padding: 40px;
      color: #ffffff;
      box-shadow: var(--shadow-lg);
    }
    .stat-metric-val {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1;
      margin-bottom: 8px;
      color: #f0f9ff;
    }
    .stat-metric-lbl {
      font-size: 0.95rem;
      color: #bae6fd;
    }

    /* SECTION 08: 评价墙 */
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-user {
      display: flex;
      gap: 12px;
      align-items: center;
      margin-top: 20px;
    }
    .review-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }

    /* SECTION 09: 资讯列表 */
    .news-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: all 0.3s ease;
    }
    .news-card:hover {
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }
    .news-img {
      height: 180px;
      width: 100%;
      object-fit: cover;
    }
    .news-content {
      padding: 20px;
    }
    .news-meta {
      display: flex;
      justify-content: space-between;
      font-size: 0.8rem;
      color: var(--slate-muted);
      margin-bottom: 8px;
    }

    /* SECTION 10: FAQ 手风琴 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--slate);
      font-size: 0.95rem;
      line-height: 1.7;
    }
    .faq-chevron {
      transition: transform 0.3s ease;
      font-size: 0.85rem;
      color: var(--slate-muted);
    }
    details[open] .faq-chevron {
      transform: rotate(180deg);
    }

    /* SECTION 11: 保障条 */
    .guarantee-card {
      text-align: center;
      padding: 24px 16px;
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
    }
    .guarantee-icon {
      font-size: 1.75rem;
      margin-bottom: 12px;
    }

    /* SECTION 12: CTA 预约转化 */
    .cta-card {
      background: linear-gradient(135deg, #042940 0%, #0c4a6e 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 50px 40px;
      text-align: center;
      box-shadow: var(--shadow-lg);
    }
    .cta-form {
      max-width: 650px;
      margin: 32px auto 0;
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
    }
    .cta-input {
      flex: 1 1 200px;
      padding: 14px 18px;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.2);
      background: rgba(255, 255, 255, 0.95);
      color: var(--dark);
      font-size: 0.95rem;
    }
    .cta-input:focus {
      outline: none;
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.5);
    }

    /* FOOTER */
    .site-footer {
      background-color: #021422;
      color: #94a3b8;
      padding: 60px 0 24px;
      font-size: 0.9rem;
      border-top: 1px solid rgba(255,255,255,0.08);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-brand {
      color: #f8fafc;
      font-size: 1.25rem;
      font-weight: 800;
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .footer-desc {
      line-height: 1.7;
      margin-bottom: 20px;
      font-size: 0.875rem;
    }
    .footer-title {
      color: #f1f5f9;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 18px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a:hover {
      color: #38bdf8;
    }
    .footer-contact-item {
      margin-bottom: 10px;
      display: flex;
      align-items: flex-start;
      gap: 8px;
      font-size: 0.875rem;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 0.825rem;
    }

    /* 移动端断点适配 */
    @media (max-width: 1024px) {
      .hero-grid, .arch-wrapper, .dark-metrics-board {
        grid-template-columns: 1fr;
        gap: 36px;
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .topbar {
        display: none;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .hero-h1 {
        font-size: 2rem;
      }
      .section-title {
        font-size: 1.75rem;
      }
      .grid-3, .grid-2, .grid-4 {
        grid-template-columns: 1fr;
      }
      .stats-strip-container .grid-4 {
        grid-template-columns: 1fr 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }