/* roulang page: index */
:root {
      --primary: #00D4AA;
      --primary-hover: #00b894;
      --primary-light: rgba(0, 212, 170, 0.12);
      --secondary: #7A5AF8;
      --accent: #FF8438;
      --bg-dark: #0C1017;
      --bg-darker: #06090E;
      --bg-card: #131924;
      --bg-card-border: rgba(255, 255, 255, 0.08);
      --bg-light: #F7F9FC;
      --bg-white: #FFFFFF;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --text-light: #E2E8F0;
      --text-light-muted: #94A3B8;
      --radius-sm: 4px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.08);
      --shadow-glow: 0 10px 30px -10px rgba(0, 212, 170, 0.3);
      --font-stack: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-stack);
      line-height: 1.75;
      background-color: var(--bg-light);
      color: var(--text-main);
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }

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

    button, input, select, textarea {
      font-family: inherit;
      outline: none;
    }

    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* Top Bar */
    .top-bar {
      background: var(--bg-darker);
      color: var(--text-light-muted);
      font-size: 0.8125rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      padding: 8px 0;
    }
    .top-bar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }
    .top-bar-item {
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .status-dot {
      width: 8px;
      height: 8px;
      background: var(--primary);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--primary);
      display: inline-block;
    }

    /* Main Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(12, 16, 23, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      transition: all 0.3s ease;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .site-brand {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-mark {
      width: 40px;
      height: 40px;
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      color: #06090e;
      font-size: 1.25rem;
      box-shadow: 0 4px 12px rgba(0, 212, 170, 0.3);
    }
    .brand-title {
      font-size: 1.125rem;
      font-weight: 700;
      color: #ffffff;
      letter-spacing: -0.02em;
    }
    .brand-badge {
      font-size: 0.6875rem;
      padding: 2px 6px;
      background: rgba(0, 212, 170, 0.15);
      color: var(--primary);
      border-radius: 4px;
      font-weight: 600;
    }

    .main-nav {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-link {
      color: #cbd5e1;
      font-size: 0.9375rem;
      font-weight: 500;
      position: relative;
      padding: 6px 0;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }
    .nav-link:hover::after, .nav-link.active::after {
      width: 100%;
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 10px 22px;
      font-size: 0.9375rem;
      font-weight: 600;
      border-radius: 8px;
      cursor: pointer;
      transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
      border: 1px solid transparent;
      min-height: 44px;
      min-width: 44px;
    }
    .btn-primary {
      background: var(--primary);
      color: #06090e;
      box-shadow: 0 4px 14px rgba(0, 212, 170, 0.25);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: var(--shadow-glow);
    }
    .btn-outline-dark {
      background: transparent;
      color: #ffffff;
      border-color: rgba(255, 255, 255, 0.2);
    }
    .btn-outline-dark:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: rgba(0, 212, 170, 0.05);
      transform: translateY(-2px);
    }
    .btn-accent {
      background: var(--accent);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(255, 132, 56, 0.3);
    }
    .btn-accent:hover {
      background: #f97316;
      transform: translateY(-2px);
    }

    /* Section Global Headers */
    .section-spacing {
      padding: 96px 0;
    }
    .section-spacing-dense {
      padding: 64px 0;
    }
    .section-header {
      margin-bottom: 56px;
      max-width: 760px;
    }
    .section-header.center {
      margin-left: auto;
      margin-right: auto;
      text-align: center;
    }
    .section-eyebrow {
      display: inline-block;
      font-size: 0.8125rem;
      font-weight: 700;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--primary);
      margin-bottom: 12px;
      background: rgba(0, 212, 170, 0.1);
      padding: 4px 10px;
      border-radius: var(--radius-sm);
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 18px;
      letter-spacing: -0.02em;
    }
    .section-subtitle {
      font-size: 1.0625rem;
      line-height: 1.8;
      color: var(--text-muted);
    }

    /* Theme Sections */
    .theme-dark {
      background: var(--bg-dark);
      color: var(--text-light);
    }
    .theme-dark .section-title {
      color: #ffffff;
    }
    .theme-dark .section-subtitle {
      color: var(--text-light-muted);
    }
    .theme-dark-alt {
      background: #090D13;
      color: var(--text-light);
    }

    /* Hero Section (Blueprint: 工业参数首屏，关键指标条 + 询盘按钮) */
    .hero-section {
      position: relative;
      background: linear-gradient(180deg, #0C1017 0%, #111722 100%);
      color: #ffffff;
      padding: 80px 0 60px;
      overflow: hidden;
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }
    .hero-bg-overlay {
      position: absolute;
      inset: 0;
      background-image: radial-gradient(rgba(0, 212, 170, 0.12) 1px, transparent 1px), radial-gradient(rgba(122, 90, 248, 0.08) 1px, transparent 1px);
      background-size: 40px 40px;
      background-position: 0 0, 20px 20px;
      opacity: 0.6;
      pointer-events: none;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero-h1 {
      font-size: 3rem;
      font-weight: 850;
      line-height: 1.2;
      letter-spacing: -0.03em;
      margin-bottom: 24px;
      background: linear-gradient(135deg, #ffffff 60%, rgba(255, 255, 255, 0.7) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-lead {
      font-size: 1.0625rem;
      line-height: 1.8;
      color: var(--text-light-muted);
      margin-bottom: 36px;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 40px;
    }
    .hero-visual-card {
      background: #141B26;
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
      position: relative;
    }
    .code-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding-bottom: 14px;
      margin-bottom: 16px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      font-family: var(--font-mono);
      font-size: 0.8125rem;
      color: var(--text-light-muted);
    }
    .code-dots {
      display: flex;
      gap: 6px;
    }
    .code-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
    }
    .code-dot.red { background: #ef4444; }
    .code-dot.yellow { background: #f59e0b; }
    .code-dot.green { background: #10b981; }
    .hero-img-wrap {
      border-radius: var(--radius-md);
      overflow: hidden;
      margin-bottom: 18px;
      position: relative;
    }
    .hero-img-wrap img {
      width: 100%;
      height: 220px;
      object-fit: cover;
    }
    .spec-table {
      width: 100%;
      border-collapse: collapse;
      font-size: 0.8125rem;
      font-family: var(--font-mono);
    }
    .spec-table td {
      padding: 8px 10px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      color: #cbd5e1;
    }
    .spec-table td:first-child {
      color: var(--text-light-muted);
    }
    .spec-table td:last-child {
      text-align: right;
      font-weight: 600;
      color: var(--primary);
    }

    /* Industrial Spec Bar */
    .industrial-spec-bar {
      margin-top: 50px;
      background: rgba(20, 27, 38, 0.8);
      border: 1px solid rgba(0, 212, 170, 0.2);
      border-radius: var(--radius-md);
      padding: 20px 32px;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    }
    .spec-metric-item {
      border-left: 2px solid var(--primary);
      padding-left: 16px;
    }
    .spec-metric-val {
      font-size: 1.75rem;
      font-weight: 800;
      color: #ffffff;
      line-height: 1.2;
      font-family: var(--font-mono);
      letter-spacing: -0.02em;
    }
    .spec-metric-val span {
      font-size: 1rem;
      color: var(--primary);
      margin-left: 4px;
    }
    .spec-metric-label {
      font-size: 0.8125rem;
      color: var(--text-light-muted);
      margin-top: 4px;
    }

    /* Cards Global */
    .card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      border: 1px solid #E2E8F0;
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 36px -12px rgba(15, 23, 42, 0.12);
      border-color: #CBD5E1;
    }
    .card-dark {
      background: var(--bg-card);
      border: 1px solid var(--bg-card-border);
      color: var(--text-light);
    }
    .card-dark:hover {
      transform: translateY(-4px);
      border-color: rgba(0, 212, 170, 0.3);
      box-shadow: 0 16px 36px -12px rgba(0, 0, 0, 0.5);
    }

    /* Grid Layouts */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 36px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    /* Icon Box */
    .icon-box {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 22px;
      font-size: 1.35rem;
    }
    .icon-box-primary {
      background: rgba(0, 212, 170, 0.15);
      color: var(--primary);
    }
    .icon-box-purple {
      background: rgba(122, 90, 248, 0.15);
      color: var(--secondary);
    }
    .icon-box-orange {
      background: rgba(255, 132, 56, 0.15);
      color: var(--accent);
    }

    /* Schedule / Timing Cards (时段卡) */
    .schedule-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .schedule-card {
      border-left: 4px solid var(--primary);
      position: relative;
      background: #ffffff;
      padding: 28px;
      border-radius: 0 var(--radius-md) var(--radius-md) 0;
      box-shadow: var(--shadow-card);
    }
    .schedule-time-tag {
      display: inline-block;
      font-family: var(--font-mono);
      font-size: 0.8125rem;
      font-weight: 700;
      padding: 4px 10px;
      background: #F1F5F9;
      color: #334155;
      border-radius: 4px;
      margin-bottom: 14px;
    }
    .schedule-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 10px;
    }
    .schedule-desc {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Expert Team (专家/团队) */
    .team-card {
      text-align: center;
      padding: 32px 24px;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid #E2E8F0;
      box-shadow: var(--shadow-card);
    }
    .team-avatar {
      width: 96px;
      height: 96px;
      border-radius: 50%;
      margin: 0 auto 20px;
      object-fit: cover;
      border: 3px solid var(--primary);
      padding: 3px;
    }
    .team-name {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 6px;
    }
    .team-role {
      font-size: 0.875rem;
      color: var(--secondary);
      font-weight: 600;
      margin-bottom: 14px;
    }
    .team-bio {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* Guarantee & Audit (评价保障/安全审计) */
    .guarantee-box {
      background: #0E1622;
      border: 1px solid rgba(0, 212, 170, 0.25);
      border-radius: var(--radius-lg);
      padding: 44px;
      position: relative;
    }
    .audit-list {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 18px;
      margin-top: 24px;
    }
    .audit-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      font-size: 0.9375rem;
      color: #cbd5e1;
    }
    .audit-check {
      width: 22px;
      height: 22px;
      border-radius: 50%;
      background: rgba(0, 212, 170, 0.2);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.75rem;
      font-weight: 800;
      flex-shrink: 0;
      margin-top: 3px;
    }

    /* News Cards (资讯) */
    .news-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid #E2E8F0;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
    }
    .news-card-img {
      height: 180px;
      width: 100%;
      object-fit: cover;
    }
    .news-card-content {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .news-date {
      font-size: 0.8125rem;
      color: var(--text-muted);
      margin-bottom: 8px;
      font-family: var(--font-mono);
    }
    .news-title {
      font-size: 1.125rem;
      font-weight: 700;
      margin-bottom: 12px;
      line-height: 1.45;
    }
    .news-snippet {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 18px;
      flex-grow: 1;
    }
    .news-link {
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--primary-hover);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    /* Process Flow */
    .process-timeline {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
      position: relative;
    }
    .process-step {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border-top: 4px solid var(--secondary);
      box-shadow: var(--shadow-card);
    }
    .step-num {
      font-family: var(--font-mono);
      font-size: 1.75rem;
      font-weight: 800;
      color: #E2E8F0;
      line-height: 1;
      margin-bottom: 12px;
    }
    .step-name {
      font-size: 1.0625rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .step-desc {
      font-size: 0.8125rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* FAQ Accordion */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid #E2E8F0;
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      overflow: hidden;
      transition: all 0.25s ease;
    }
    .faq-item:hover {
      border-color: #CBD5E1;
    }
    .faq-question {
      padding: 20px 24px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 700;
      font-size: 1.0625rem;
      color: var(--text-main);
      user-select: none;
    }
    .faq-icon {
      width: 28px;
      height: 28px;
      border-radius: 50%;
      background: #F1F5F9;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: transform 0.3s ease;
      font-size: 0.875rem;
      flex-shrink: 0;
      color: var(--text-muted);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.9375rem;
      line-height: 1.75;
      background: #FAFBFD;
    }
    .faq-item.active .faq-question {
      color: var(--primary-hover);
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
      background: rgba(0, 212, 170, 0.15);
      color: var(--primary);
    }
    .faq-item.active .faq-answer {
      max-height: 250px;
      padding: 0 24px 20px;
    }

    /* Consultation / Booking Form (预约表单) */
    .contact-card {
      background: linear-gradient(135deg, #0C1017 0%, #151D2A 100%);
      border: 1px solid rgba(0, 212, 170, 0.3);
      border-radius: var(--radius-lg);
      padding: 56px 48px;
      color: #ffffff;
      box-shadow: 0 24px 48px rgba(0, 0, 0, 0.35);
    }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-bottom: 24px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .form-group.full-width {
      grid-column: span 2;
    }
    .form-label {
      font-size: 0.875rem;
      font-weight: 600;
      color: #cbd5e1;
    }
    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: 8px;
      color: #ffffff;
      font-size: 0.9375rem;
      transition: all 0.25s ease;
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
      background: rgba(255, 255, 255, 0.08);
      box-shadow: 0 0 0 3px rgba(0, 212, 170, 0.2);
    }
    .form-input::placeholder, .form-textarea::placeholder {
      color: #64748B;
    }

    /* Footer */
    .site-footer {
      background: #06090E;
      color: #94A3B8;
      padding: 80px 0 32px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.875rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 48px;
      margin-bottom: 56px;
    }
    .footer-brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 16px;
    }
    .footer-heading {
      color: #ffffff;
      font-size: 0.9375rem;
      font-weight: 700;
      margin-bottom: 20px;
      letter-spacing: 0.02em;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .footer-links a:hover {
      color: var(--primary);
      padding-left: 4px;
    }
    .footer-contact-item {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 12px;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding-top: 32px;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
      font-size: 0.8125rem;
      color: #64748B;
    }

    /* Mobile Drawer */
    .mobile-menu-toggle {
      display: none;
      background: transparent;
      border: none;
      color: #ffffff;
      font-size: 1.5rem;
      cursor: pointer;
      padding: 8px;
    }

    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .grid-3, .schedule-grid, .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .industrial-spec-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .section-spacing {
        padding: 64px 0;
      }
      .hero-h1 {
        font-size: 2.125rem;
      }
      .main-nav, .top-bar-item.hide-mobile {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .grid-3, .grid-2, .grid-4, .schedule-grid, .process-timeline, .form-grid, .industrial-spec-bar {
        grid-template-columns: 1fr;
      }
      .form-group.full-width {
        grid-column: span 1;
      }
      .audit-list {
        grid-template-columns: 1fr;
      }
      .contact-card {
        padding: 32px 20px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }
    }