/* roulang page: index */
:root {
      --primary: #4F46E5;
      --primary-hover: #4338CA;
      --accent: #F97316;
      --accent-hover: #EA580C;
      --dark-bg: #0F172A;
      --dark-card: #1E293B;
      --dark-border: #334155;
      --light-bg: #F8FAFC;
      --white: #FFFFFF;
      --text-main: #0F172A;
      --text-muted: #475569;
      --text-light: #94A3B8;
      --border-color: #E2E8F0;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
      --shadow-md: 0 6px 12px -2px rgba(15,23,42,0.08);
      --shadow-lg: 0 20px 25px -5px rgba(15,23,42,0.1);
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--light-bg);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input, select, textarea {
      font: inherit;
    }
    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .top-toolbar {
      background-color: #0b1120;
      color: var(--text-light);
      font-size: 13px;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .top-toolbar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-toolbar-left span {
      margin-right: 20px;
    }
    .header-main {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      position: sticky;
      top: 0;
      z-index: 100;
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
    }
    .logo-badge {
      background: var(--primary);
      color: var(--white);
      width: 34px;
      height: 34px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-sm);
      font-size: 18px;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      list-style: none;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--primary);
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 15px;
      border: 1px solid transparent;
      cursor: pointer;
      transition: var(--transition);
      text-align: center;
    }
    .btn-primary {
      background-color: var(--primary);
      color: var(--white);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
    }
    .btn-accent {
      background-color: var(--accent);
      color: var(--white);
    }
    .btn-accent:hover {
      background-color: var(--accent-hover);
      box-shadow: 0 4px 12px rgba(249, 115, 22, 0.3);
    }
    .btn-outline {
      border-color: var(--border-color);
      color: var(--text-main);
      background-color: var(--white);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
    }
    .btn-outline-dark {
      border-color: var(--dark-border);
      color: var(--white);
      background-color: transparent;
    }
    .btn-outline-dark:hover {
      border-color: var(--accent);
      color: var(--accent);
    }
    section {
      padding: 88px 0;
      position: relative;
    }
    .section-title-wrap {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 56px;
    }
    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      background: #EEF2FF;
      color: var(--primary);
      font-size: 13px;
      font-weight: 600;
      border-radius: 999px;
      margin-bottom: 12px;
      border: 1px solid #E0E7FF;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .section-dark {
      background-color: var(--dark-bg);
      color: var(--white);
    }
    .section-dark .section-title {
      color: var(--white);
    }
    .section-dark .section-desc {
      color: var(--text-light);
    }
    .section-dark .section-badge {
      background: rgba(79, 70, 229, 0.2);
      color: #A5B4FC;
      border-color: rgba(99, 102, 241, 0.3);
    }
    /* Hero Vertical Style Blueprint */
    .hero-section {
      background: linear-gradient(135deg, #090E17 0%, #151D2F 100%);
      color: var(--white);
      padding: 80px 0 100px;
      position: relative;
      overflow: hidden;
    }
    .hero-bg-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.18;
      pointer-events: none;
    }
    .hero-layout {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 48px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 44px;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }
    .hero-content h1 span {
      color: #818CF8;
    }
    .hero-intro {
      font-size: 16px;
      color: #CBD5E1;
      margin-bottom: 32px;
      line-height: 1.8;
    }
    .hero-cta-group {
      display: flex;
      gap: 16px;
      margin-bottom: 40px;
    }
    .hero-quick-data {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      padding-top: 24px;
      border-top: 1px solid rgba(255,255,255,0.12);
    }
    .quick-data-item strong {
      display: block;
      font-size: 28px;
      color: var(--accent);
      font-weight: 700;
      font-family: monospace;
    }
    .quick-data-item span {
      font-size: 13px;
      color: var(--text-light);
    }
    /* Vertical Media Screen Layout */
    .vertical-screen-card {
      background: var(--dark-card);
      border: 1px solid var(--dark-border);
      border-radius: 20px;
      padding: 16px;
      box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
      position: relative;
    }
    .screen-header-bar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 0 6px 12px;
      border-bottom: 1px solid rgba(255,255,255,0.08);
      font-size: 13px;
      color: var(--text-light);
    }
    .screen-img-box {
      border-radius: 12px;
      overflow: hidden;
      margin-top: 12px;
      position: relative;
      aspect-ratio: 9/12;
      background: #000;
    }
    .screen-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .screen-floating-tag {
      position: absolute;
      bottom: 16px;
      left: 16px;
      right: 16px;
      background: rgba(15, 23, 42, 0.85);
      backdrop-filter: blur(6px);
      padding: 12px 14px;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255,255,255,0.1);
    }
    .screen-floating-tag h4 {
      font-size: 14px;
      color: var(--white);
      margin-bottom: 4px;
    }
    .screen-floating-tag p {
      font-size: 12px;
      color: #CBD5E1;
      line-height: 1.4;
    }
    /* Catalog & Matrix Grid */
    .catalog-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .catalog-item {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 28px;
      border: 1px solid var(--border-color);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .catalog-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #C7D2FE;
    }
    .catalog-icon {
      width: 48px;
      height: 48px;
      background: #EEF2FF;
      color: var(--primary);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      margin-bottom: 18px;
      font-weight: bold;
    }
    .catalog-item h3 {
      font-size: 18px;
      margin-bottom: 10px;
      color: var(--text-main);
    }
    .catalog-item p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
      flex-grow: 1;
    }
    .catalog-meta {
      font-size: 12px;
      color: var(--primary);
      font-weight: 600;
    }
    /* Architecture Band */
    .arch-band {
      background: #FFFFFF;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .arch-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 48px;
      align-items: center;
    }
    .arch-text h2 {
      font-size: 28px;
      margin-bottom: 16px;
      line-height: 1.35;
    }
    .arch-text p {
      color: var(--text-muted);
      margin-bottom: 20px;
      font-size: 15px;
    }
    .arch-param-box {
      background: var(--light-bg);
      padding: 20px;
      border-radius: var(--radius-md);
      border-left: 4px solid var(--primary);
      font-size: 14px;
      color: #334155;
      line-height: 1.7;
    }
    .arch-img-frame {
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }
    /* Suites Pricing / Types */
    .suites-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .suite-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 36px 28px;
      border: 1px solid var(--border-color);
      position: relative;
      display: flex;
      flex-direction: column;
    }
    .suite-card.highlight {
      border: 2px solid var(--accent);
      box-shadow: var(--shadow-lg);
    }
    .suite-badge {
      position: absolute;
      top: -12px;
      right: 24px;
      background: var(--accent);
      color: var(--white);
      padding: 4px 12px;
      font-size: 12px;
      font-weight: 700;
      border-radius: 999px;
    }
    .suite-card h3 {
      font-size: 22px;
      margin-bottom: 8px;
    }
    .suite-sub {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 24px;
    }
    .suite-features {
      list-style: none;
      margin-bottom: 32px;
      flex-grow: 1;
    }
    .suite-features li {
      font-size: 14px;
      color: #334155;
      padding: 8px 0;
      border-bottom: 1px dashed #F1F5F9;
      display: flex;
      align-items: center;
    }
    .suite-features li::before {
      content: "✓";
      color: var(--primary);
      font-weight: bold;
      margin-right: 10px;
    }
    /* Case Stories Flow */
    .story-strip {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      margin-bottom: 56px;
    }
    .story-strip:last-child {
      margin-bottom: 0;
    }
    .story-strip.reversed .story-img-side {
      order: 2;
    }
    .story-strip.reversed .story-text-side {
      order: 1;
    }
    .story-img-side {
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
    }
    .story-text-side h3 {
      font-size: 24px;
      margin-bottom: 16px;
      line-height: 1.4;
    }
    .story-text-side p {
      color: var(--text-muted);
      font-size: 15px;
      line-height: 1.7;
      margin-bottom: 16px;
    }
    .story-tags {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
    }
    .story-tag {
      background: #F1F5F9;
      color: #475569;
      font-size: 12px;
      padding: 4px 10px;
      border-radius: var(--radius-sm);
    }
    /* Metrics Strip */
    .metrics-bar {
      background: #FFFFFF;
      padding: 56px 0;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .metric-cell h4 {
      font-size: 38px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 6px;
      font-family: monospace;
    }
    .metric-cell p {
      font-size: 14px;
      color: var(--text-muted);
    }
    /* Testimonial Cards */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: var(--white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
    }
    .review-stars {
      color: #EAB308;
      font-size: 16px;
      margin-bottom: 14px;
      letter-spacing: 2px;
    }
    .review-card blockquote {
      font-size: 14px;
      color: #334155;
      line-height: 1.7;
      margin-bottom: 20px;
      font-style: normal;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .author-avatar {
      width: 42px;
      height: 42px;
      background: #E0E7FF;
      color: var(--primary);
      font-weight: bold;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 15px;
    }
    .author-info h5 {
      font-size: 14px;
      font-weight: 700;
    }
    .author-info span {
      font-size: 12px;
      color: var(--text-light);
    }
    /* Insights & Articles */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-card {
      background: var(--white);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
    }
    .news-thumb {
      height: 180px;
      position: relative;
      overflow: hidden;
    }
    .news-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .news-body {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .news-date {
      font-size: 12px;
      color: var(--text-light);
      margin-bottom: 8px;
    }
    .news-body h3 {
      font-size: 17px;
      line-height: 1.4;
      margin-bottom: 10px;
    }
    .news-body p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }
    .news-link {
      font-size: 13px;
      color: var(--primary);
      font-weight: 600;
      align-self: flex-start;
      cursor: pointer;
    }
    /* Platform Guarantee */
    .guarantee-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .guarantee-item {
      background: var(--white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
    }
    .guarantee-icon {
      font-size: 26px;
      margin-bottom: 12px;
      color: var(--primary);
    }
    .guarantee-item h4 {
      font-size: 16px;
      margin-bottom: 8px;
    }
    .guarantee-item p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }
    /* FAQ Accordion */
    .faq-container {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }
    .faq-question:hover {
      background-color: #F8FAFC;
    }
    .faq-icon-cross {
      font-size: 18px;
      color: var(--text-light);
      transition: var(--transition);
    }
    .faq-item.active .faq-icon-cross {
      transform: rotate(45deg);
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: #FAFAFC;
      border-top: 1px solid transparent;
    }
    .faq-item.active .faq-answer {
      border-top-color: var(--border-color);
    }
    .faq-answer-inner {
      padding: 20px 24px;
      font-size: 14px;
      color: #475569;
      line-height: 1.7;
    }
    /* Contact Form Section */
    .form-wrap {
      max-width: 720px;
      margin: 0 auto;
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 44px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-lg);
    }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-bottom: 24px;
    }
    .form-group.full-width {
      grid-column: span 2;
    }
    .form-group label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      color: #334155;
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      transition: var(--transition);
      background: #FFFFFF;
    }
    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
    }
    .form-privacy-note {
      font-size: 12px;
      color: var(--text-light);
      text-align: center;
      margin-top: 16px;
      line-height: 1.5;
    }
    /* Footer */
    .site-footer {
      background: #0B1120;
      color: #94A3B8;
      padding: 64px 0 24px;
      border-top: 1px solid #1E293B;
      font-size: 14px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1.6fr;
      gap: 40px;
      margin-bottom: 48px;
    }
    .footer-col h4 {
      color: var(--white);
      font-size: 16px;
      margin-bottom: 18px;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a:hover {
      color: var(--white);
    }
    .footer-bottom {
      padding-top: 28px;
      border-top: 1px solid #1E293B;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
      color: #64748B;
    }
    .footer-bottom a {
      color: #64748B;
    }
    .footer-bottom a:hover {
      color: #94A3B8;
    }
    /* Responsive Breakpoints */
    @media (max-width: 1024px) {
      .hero-layout, .arch-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .catalog-grid, .suites-grid, .news-grid, .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid, .guarantee-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .top-toolbar {
        display: none;
      }
      .header-inner {
        height: 64px;
      }
      .nav-links {
        display: none;
      }
      .hero-content h1 {
        font-size: 32px;
      }
      .hero-quick-data {
        grid-template-columns: 1fr;
      }
      .catalog-grid, .suites-grid, .news-grid, .reviews-grid {
        grid-template-columns: 1fr;
      }
      .story-strip, .story-strip.reversed {
        grid-template-columns: 1fr;
      }
      .story-strip.reversed .story-img-side {
        order: 1;
      }
      .story-strip.reversed .story-text-side {
        order: 2;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full-width {
        grid-column: span 1;
      }
      .form-wrap {
        padding: 24px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
    }