/* roulang page: index */
:root {
      --bg-ivory: #F7F6F2;
      --bg-paper: #FFFFFF;
      --bg-tint: #EFECE5;
      --bg-obsidian: #121413;
      --bg-obsidian-soft: #1B1F1D;
      --text-ink: #161817;
      --text-slate: #575C59;
      --text-muted: #727874;
      --text-ivory: #F4F4F0;
      --text-ivory-muted: #B2B7B3;
      --accent-emerald: #0D6E5B;
      --accent-emerald-hover: #095445;
      --accent-emerald-light: #E6F2EF;
      --accent-gold: #B5894C;
      --accent-gold-light: #F7F1E7;
      --border-hairline: #E2E1DC;
      --border-dark: #2B302D;
      --radius-sm: 4px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --shadow-subtle: 0 4px 16px rgba(18, 20, 19, 0.04);
      --shadow-lift: 0 14px 32px rgba(18, 20, 19, 0.08);
      --shadow-dark: 0 18px 40px rgba(0, 0, 0, 0.28);
      --transition-base: 0.28s cubic-bezier(0.22, 1, 0.36, 1);
      --container-max: 1240px;
      --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", -apple-system, BlinkMacSystemFont, sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
      -webkit-text-size-adjust: 100%;
    }

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

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

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

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

    button {
      cursor: pointer;
      border: none;
      background: none;
    }

    ul, ol {
      list-style: none;
    }

    :focus-visible {
      outline: 2px solid var(--accent-emerald);
      outline-offset: 2px;
    }

    .tabular {
      font-variant-numeric: tabular-nums;
    }

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

    /* Buttons */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 13px 26px;
      border-radius: var(--radius-sm);
      font-size: 0.9375rem;
      font-weight: 600;
      letter-spacing: 0.02em;
      transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), color var(--transition-base);
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--accent-emerald);
      color: #FFFFFF;
      border: 1px solid var(--accent-emerald);
    }

    .btn-primary:hover {
      background-color: var(--accent-emerald-hover);
      border-color: var(--accent-emerald-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(13, 110, 91, 0.24);
    }

    .btn-outline {
      background-color: transparent;
      color: var(--text-ink);
      border: 1px solid var(--text-ink);
    }

    .btn-outline:hover {
      background-color: var(--text-ink);
      color: var(--bg-paper);
      transform: translateY(-2px);
    }

    .btn-outline-light {
      background-color: transparent;
      color: var(--text-ivory);
      border: 1px solid rgba(244, 244, 240, 0.35);
    }

    .btn-outline-light:hover {
      background-color: var(--text-ivory);
      color: var(--bg-obsidian);
      border-color: var(--text-ivory);
    }

    .btn-sm {
      padding: 9px 18px;
      font-size: 0.875rem;
    }

    /* Section Header */
    .section-block {
      padding: 96px 0;
      border-bottom: 1px solid var(--border-hairline);
    }

    .section-paper {
      background-color: var(--bg-paper);
    }

    .section-ivory {
      background-color: var(--bg-ivory);
    }

    .section-tint {
      background-color: var(--bg-tint);
    }

    .section-dark {
      background-color: var(--bg-obsidian);
      color: var(--text-ivory);
      border-bottom-color: var(--border-dark);
    }

    .section-head {
      max-width: 760px;
      margin-bottom: 48px;
    }

    .section-head-split {
      display: flex;
      justify-content: space-between;
      align-items: flex-end;
      gap: 32px;
      margin-bottom: 48px;
    }

    .section-head-split .section-head {
      margin-bottom: 0;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 0.8125rem;
      font-weight: 600;
      letter-spacing: 0.08em;
      color: var(--accent-emerald);
      margin-bottom: 12px;
      text-transform: uppercase;
    }

    .eyebrow-gold {
      color: var(--accent-gold);
    }

    .section-dark .eyebrow {
      color: var(--accent-gold);
    }

    .section-title {
      font-size: clamp(1.5rem, 2.6vw, 2.25rem);
      line-height: 1.25;
      font-weight: 700;
      letter-spacing: -0.015em;
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-slate);
      line-height: 1.75;
    }

    .section-dark .section-desc {
      color: var(--text-ivory-muted);
    }

    /* Header (Single Semantic Dual-Row Responsive Navigation) */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: rgba(247, 246, 242, 0.94);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-hairline);
    }

    .header-topbar {
      border-bottom: 1px solid var(--border-hairline);
      background-color: var(--bg-obsidian);
      color: var(--text-ivory-muted);
      font-size: 0.8125rem;
      padding: 7px 0;
    }

    .topbar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
    }

    .topbar-badges {
      display: flex;
      align-items: center;
      gap: 18px;
    }

    .topbar-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .topbar-dot {
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background-color: var(--accent-gold);
    }

    .topbar-contacts {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .topbar-contacts a:hover {
      color: var(--text-ivory);
    }

    .header-main {
      padding: 14px 0;
    }

    .nav-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }

    .brand-logo {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      flex-shrink: 0;
    }

    .brand-mark {
      width: 36px;
      height: 36px;
      border-radius: var(--radius-sm);
      background-color: var(--accent-emerald);
      color: #FFFFFF;
      display: grid;
      place-items: center;
      font-weight: 700;
      font-size: 1rem;
      letter-spacing: 0.04em;
      border: 1px solid rgba(181, 137, 76, 0.5);
    }

    .brand-text-wrap {
      display: flex;
      flex-direction: column;
      line-height: 1.2;
    }

    .brand-name {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-ink);
      letter-spacing: -0.01em;
    }

    .brand-sub {
      font-size: 0.75rem;
      color: var(--text-slate);
    }

    .nav-menu-wrap {
      display: flex;
      align-items: center;
      gap: 28px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 22px;
    }

    .nav-link {
      font-size: 0.9375rem;
      font-weight: 500;
      color: var(--text-slate);
      padding: 6px 2px;
      position: relative;
    }

    .nav-link::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: 0;
      width: 0;
      height: 2px;
      background-color: var(--accent-emerald);
      transition: width var(--transition-base);
    }

    .nav-link:hover,
    .nav-link.active {
      color: var(--text-ink);
    }

    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }

    .nav-cta-desktop {
      flex-shrink: 0;
    }

    .mobile-toggle {
      display: none;
      width: 44px;
      height: 44px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-hairline);
      background-color: var(--bg-paper);
      align-items: center;
      justify-content: center;
      flex-direction: column;
      gap: 5px;
    }

    .mobile-toggle span {
      display: block;
      width: 20px;
      height: 2px;
      background-color: var(--text-ink);
      transition: transform 0.25s ease, opacity 0.25s ease;
    }

    /* 1. Hero Banner (3-slide interactive + countdown briefing strip) */
    .hero-section {
      position: relative;
      background-color: var(--bg-obsidian);
      color: var(--text-ivory);
      overflow: hidden;
      border-bottom: 1px solid var(--border-dark);
    }

    .hero-slider {
      position: relative;
      min-height: 620px;
      display: flex;
      align-items: center;
    }

    .hero-bg-layer {
      position: absolute;
      inset: 0;
      z-index: 0;
    }

    .hero-bg-slide {
      position: absolute;
      inset: 0;
      opacity: 0;
      transition: opacity 0.7s ease;
    }

    .hero-bg-slide.is-active {
      opacity: 1;
    }

    .hero-bg-slide img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      filter: brightness(0.45) contrast(1.06);
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(96deg, rgba(18, 20, 19, 0.94) 0%, rgba(18, 20, 19, 0.82) 52%, rgba(18, 20, 19, 0.56) 100%);
      z-index: 1;
    }

    .hero-inner {
      position: relative;
      z-index: 2;
      padding: 72px 0 80px;
      display: grid;
      grid-template-columns: 1.25fr 0.75fr;
      gap: 48px;
      align-items: center;
    }

    .hero-kicker {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      padding: 6px 14px;
      border-radius: var(--radius-sm);
      background-color: rgba(181, 137, 76, 0.14);
      border: 1px solid rgba(181, 137, 76, 0.4);
      color: #E8C794;
      font-size: 0.8125rem;
      font-weight: 600;
      margin-bottom: 20px;
    }

    .hero-title {
      font-size: clamp(2rem, 4vw, 3.25rem);
      line-height: 1.18;
      font-weight: 700;
      letter-spacing: -0.02em;
      color: #FFFFFF;
      margin-bottom: 20px;
    }

    .hero-subtitle {
      font-size: 1.0625rem;
      line-height: 1.75;
      color: #D2D6D3;
      max-width: 620px;
      margin-bottom: 32px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
      margin-bottom: 36px;
    }

    .hero-controls {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .hero-dots {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .hero-dot {
      width: 28px;
      height: 4px;
      border-radius: 2px;
      background-color: rgba(244, 244, 240, 0.28);
      transition: background-color 0.25s ease, width 0.25s ease;
    }

    .hero-dot.is-active {
      width: 48px;
      background-color: var(--accent-gold);
    }

    .hero-slide-label {
      font-size: 0.8125rem;
      color: var(--text-ivory-muted);
    }

    .hero-brief-panel {
      background-color: rgba(27, 31, 29, 0.86);
      border: 1px solid rgba(226, 225, 220, 0.16);
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--shadow-dark);
    }

    .brief-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding-bottom: 16px;
      border-bottom: 1px solid var(--border-dark);
      margin-bottom: 20px;
    }

    .brief-tag {
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--accent-gold);
      letter-spacing: 0.06em;
    }

    .brief-live {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 0.75rem;
      color: #6CE0C4;
    }

    .brief-live::before {
      content: "";
      width: 7px;
      height: 7px;
      border-radius: 50%;
      background-color: #6CE0C4;
    }

    .brief-title {
      font-size: 1.125rem;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 10px;
    }

    .brief-copy {
      font-size: 0.875rem;
      color: var(--text-ivory-muted);
      margin-bottom: 20px;
      line-height: 1.65;
    }

    .countdown-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 10px;
      margin-bottom: 22px;
    }

    .countdown-cell {
      background-color: rgba(18, 20, 19, 0.72);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-sm);
      padding: 12px 8px;
      text-align: center;
    }

    .countdown-num {
      display: block;
      font-size: 1.375rem;
      font-weight: 700;
      color: #FFFFFF;
      line-height: 1.2;
    }

    .countdown-unit {
      font-size: 0.75rem;
      color: var(--text-ivory-muted);
    }

    .brief-meta {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      padding-top: 16px;
      border-top: 1px solid var(--border-dark);
      font-size: 0.8125rem;
      color: var(--text-ivory-muted);
      margin-bottom: 18px;
    }

    .brief-meta strong {
      display: block;
      color: #FFFFFF;
      font-size: 0.9375rem;
      margin-top: 2px;
    }

    /* 2. Pain Points (4-cell asymmetric diagnostic grid) */
    .pain-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 24px;
    }

    .pain-col {
      display: grid;
      gap: 24px;
    }

    .pain-card {
      background-color: var(--bg-paper);
      border: 1px solid var(--border-hairline);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
    }

    .pain-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-lift);
      border-color: var(--accent-emerald);
    }

    .pain-card-highlight {
      background-color: var(--bg-obsidian);
      color: var(--text-ivory);
      border-color: var(--border-dark);
    }

    .pain-card-highlight .pain-loss {
      color: #E8C794;
      border-color: rgba(181, 137, 76, 0.35);
      background-color: rgba(181, 137, 76, 0.12);
    }

    .pain-card-highlight p {
      color: var(--text-ivory-muted);
    }

    .pain-top {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .pain-code {
      font-size: 0.8125rem;
      font-weight: 700;
      color: var(--accent-gold);
      letter-spacing: 0.06em;
    }

    .pain-loss {
      font-size: 0.75rem;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: var(--radius-sm);
      background-color: var(--accent-gold-light);
      color: #8A6228;
      border: 1px solid rgba(181, 137, 76, 0.3);
    }

    .pain-card h3 {
      font-size: 1.1875rem;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .pain-card p {
      font-size: 0.9375rem;
      color: var(--text-slate);
      margin-bottom: 16px;
    }

    .pain-compare {
      padding-top: 14px;
      border-top: 1px dashed var(--border-hairline);
      font-size: 0.875rem;
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--accent-emerald);
      font-weight: 600;
    }

    .pain-card-highlight .pain-compare {
      border-top-color: var(--border-dark);
      color: #6CE0C4;
    }

    /* 3. Brand Intro & Platform Architecture (Bento Grid) */
    .bento-arch {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 36px;
      align-items: stretch;
    }

    .bento-copy-card {
      background-color: var(--bg-ivory);
      border: 1px solid var(--border-hairline);
      border-radius: var(--radius-lg);
      padding: 36px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      gap: 28px;
    }

    .spec-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .spec-item {
      background-color: var(--bg-paper);
      border: 1px solid var(--border-hairline);
      border-radius: var(--radius-md);
      padding: 18px;
    }

    .spec-val {
      font-size: 1.375rem;
      font-weight: 700;
      color: var(--accent-emerald);
      margin-bottom: 4px;
    }

    .spec-label {
      font-size: 0.875rem;
      color: var(--text-slate);
    }

    .cert-bar {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      padding-top: 20px;
      border-top: 1px solid var(--border-hairline);
    }

    .cert-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 14px;
      border-radius: var(--radius-sm);
      background-color: var(--bg-paper);
      border: 1px solid var(--border-hairline);
      font-size: 0.8125rem;
      font-weight: 600;
      color: var(--text-ink);
    }

    .cert-pill i {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background-color: var(--accent-gold);
      display: inline-block;
    }

    .bento-visual-stack {
      display: grid;
      gap: 20px;
    }

    .media-frame {
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-hairline);
      background-color: var(--bg-paper);
    }

    .ratio-16-10 {
      aspect-ratio: 16 / 10;
    }

    .ratio-16-9 {
      aspect-ratio: 16 / 9;
    }

    .ratio-4-3 {
      aspect-ratio: 4 / 3;
    }

    .media-frame img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }

    .media-frame:hover img {
      transform: scale(1.03);
    }

    .arch-layers-mini {
      background-color: var(--bg-paper);
      border: 1px solid var(--border-hairline);
      border-radius: var(--radius-md);
      padding: 22px 24px;
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
    }

    .arch-layer-col strong {
      display: block;
      font-size: 0.9375rem;
      margin-bottom: 4px;
    }

    .arch-layer-col span {
      font-size: 0.8125rem;
      color: var(--text-slate);
    }

    /* 4. Core Advantages (6 Cards 3x2) */
    .adv-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .adv-card {
      background-color: var(--bg-paper);
      border: 1px solid var(--border-hairline);
      border-radius: var(--radius-md);
      padding: 28px;
      position: relative;
      transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
    }

    .adv-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-lift);
      border-color: var(--accent-emerald);
    }

    .adv-num {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 36px;
      height: 36px;
      border-radius: var(--radius-sm);
      background-color: var(--accent-gold-light);
      color: #8A6228;
      border: 1px solid rgba(181, 137, 76, 0.35);
      font-weight: 700;
      font-size: 0.875rem;
      margin-bottom: 18px;
    }

    .adv-card h3 {
      font-size: 1.125rem;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .adv-card p {
      font-size: 0.9375rem;
      color: var(--text-slate);
      margin-bottom: 16px;
    }

    .adv-meta {
      font-size: 0.8125rem;
      font-weight: 600;
      color: var(--accent-emerald);
    }

    /* 5. Workflow Steps (Horizontal 4-Step Timeline) */
    .timeline-track {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }

    .timeline-track::before {
      content: "";
      position: absolute;
      top: 26px;
      left: 40px;
      right: 40px;
      height: 1px;
      border-top: 2px dashed var(--border-hairline);
      z-index: 0;
    }

    .step-card {
      position: relative;
      z-index: 1;
      background-color: var(--bg-ivory);
      border: 1px solid var(--border-hairline);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: transform var(--transition-base), border-color var(--transition-base);
    }

    .step-card:nth-child(2) {
      margin-top: 16px;
    }

    .step-card:nth-child(3) {
      margin-top: 32px;
    }

    .step-card:nth-child(4) {
      margin-top: 48px;
    }

    .step-card:hover {
      transform: translateY(-3px);
      border-color: var(--accent-emerald);
    }

    .step-badge {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background-color: var(--bg-paper);
      border: 2px solid var(--accent-emerald);
      color: var(--accent-emerald);
      font-weight: 700;
      font-size: 1rem;
      margin-bottom: 18px;
    }

    .step-card h3 {
      font-size: 1.0625rem;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .step-card p {
      font-size: 0.9rem;
      color: var(--text-slate);
      margin-bottom: 14px;
    }

    .step-deliverable {
      font-size: 0.8125rem;
      color: var(--text-ink);
      background-color: var(--bg-paper);
      border: 1px solid var(--border-hairline);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
    }

    /* 6. Featured Products (1 Wide Lead Card + 2 Functional Cards) */
    .product-asymmetric {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }

    .product-lead {
      grid-column: 1 / -1;
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 32px;
      background-color: var(--bg-paper);
      border: 1px solid var(--border-hairline);
      border-radius: var(--radius-lg);
      padding: 32px;
      align-items: center;
      transition: box-shadow var(--transition-base), border-color var(--transition-base);
    }

    .product-lead:hover {
      box-shadow: var(--shadow-lift);
      border-color: var(--accent-emerald);
    }

    .product-sub {
      background-color: var(--bg-paper);
      border: 1px solid var(--border-hairline);
      border-radius: var(--radius-lg);
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      gap: 20px;
      transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
    }

    .product-sub:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-lift);
      border-color: var(--accent-emerald);
    }

    .tag-row {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin: 14px 0 20px;
    }

    .cap-tag {
      font-size: 0.75rem;
      font-weight: 600;
      padding: 5px 10px;
      border-radius: var(--radius-sm);
      background-color: var(--accent-emerald-light);
      color: var(--accent-emerald);
    }

    .product-title {
      font-size: 1.375rem;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .product-sub .product-title {
      font-size: 1.1875rem;
    }

    .product-desc {
      font-size: 0.9375rem;
      color: var(--text-slate);
    }

    .product-footer {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding-top: 16px;
      border-top: 1px solid var(--border-hairline);
    }

    /* 7. Dark Philosophy & Benchmark Case */
    .dark-split {
      display: grid;
      grid-template-columns: 1.05fr 0.95fr;
      gap: 44px;
      align-items: center;
    }

    .case-compare-box {
      background-color: var(--bg-obsidian-soft);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-top: 28px;
    }

    .case-compare-head {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 16px;
      padding-bottom: 12px;
      border-bottom: 1px solid var(--border-dark);
      font-size: 0.875rem;
      color: var(--accent-gold);
      font-weight: 600;
    }

    .case-metrics-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
    }

    .case-metric-item strong {
      display: block;
      font-size: 1.5rem;
      color: #FFFFFF;
      line-height: 1.25;
    }

    .case-metric-item span {
      font-size: 0.8125rem;
      color: var(--text-ivory-muted);
    }

    .arch-diagram {
      display: grid;
      gap: 14px;
    }

    .arch-tier {
      background-color: var(--bg-obsidian-soft);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 18px 22px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
      transition: border-color var(--transition-base), transform var(--transition-base);
    }

    .arch-tier:hover {
      border-color: var(--accent-gold);
      transform: translateX(4px);
    }

    .arch-tier-title {
      font-size: 1rem;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 4px;
    }

    .arch-tier-sub {
      font-size: 0.8125rem;
      color: var(--text-ivory-muted);
    }

    .arch-tier-badge {
      font-size: 0.75rem;
      font-weight: 600;
      padding: 5px 10px;
      border-radius: var(--radius-sm);
      background-color: rgba(13, 110, 91, 0.25);
      color: #7EE5CE;
      border: 1px solid rgba(13, 110, 91, 0.5);
      flex-shrink: 0;
    }

    /* 8. User Stories & Audience Tabs */
    .story-tabs {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-bottom: 28px;
    }

    .story-tab-btn {
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-hairline);
      background-color: var(--bg-paper);
      color: var(--text-slate);
      font-weight: 600;
      font-size: 0.9375rem;
      transition: all var(--transition-base);
    }

    .story-tab-btn:hover {
      border-color: var(--accent-emerald);
      color: var(--text-ink);
    }

    .story-tab-btn.is-active {
      background-color: var(--accent-emerald);
      border-color: var(--accent-emerald);
      color: #FFFFFF;
    }

    .story-panel {
      display: none;
      background-color: var(--bg-paper);
      border: 1px solid var(--border-hairline);
      border-radius: var(--radius-lg);
      padding: 32px;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 32px;
      align-items: center;
    }

    .story-panel.is-active {
      display: grid;
      animation: fadeSlideIn 0.35s ease;
    }

    @keyframes fadeSlideIn {
      from { opacity: 0; transform: translateY(8px); }
      to { opacity: 1; transform: translateY(0); }
    }

    .story-quote {
      font-size: 1.125rem;
      line-height: 1.7;
      font-weight: 600;
      color: var(--text-ink);
      margin-bottom: 18px;
      padding-left: 16px;
      border-left: 3px solid var(--accent-gold);
    }

    .story-kpis {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 14px;
      margin-top: 22px;
      padding-top: 18px;
      border-top: 1px solid var(--border-hairline);
    }

    .story-kpi strong {
      display: block;
      font-size: 1.25rem;
      color: var(--accent-emerald);
    }

    .story-kpi span {
      font-size: 0.8125rem;
      color: var(--text-slate);
    }

    /* 9. Key Metrics Strip */
    .metrics-strip-section {
      padding: 64px 0;
      background-color: var(--bg-tint);
      border-bottom: 1px solid var(--border-hairline);
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
    }

    .metric-cell {
      padding: 12px 28px;
      border-right: 1px solid var(--border-hairline);
    }

    .metric-cell:last-child {
      border-right: none;
    }

    .metric-number {
      font-size: clamp(1.85rem, 3vw, 2.5rem);
      font-weight: 700;
      color: var(--accent-emerald);
      line-height: 1.2;
      margin-bottom: 6px;
    }

    .metric-title {
      font-size: 0.9375rem;
      font-weight: 700;
      margin-bottom: 4px;
    }

    .metric-note {
      font-size: 0.8125rem;
      color: var(--text-slate);
    }

    /* 10. Testimonials (Staggered Cards) */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .testimonial-card {
      background-color: var(--bg-paper);
      border: 1px solid var(--border-hairline);
      border-radius: var(--radius-md);
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      gap: 20px;
      transition: transform var(--transition-base), box-shadow var(--transition-base);
    }

    .testimonial-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-lift);
    }

    .testimonial-card:nth-child(even) {
      transform: translateY(12px);
    }

    .testimonial-card:nth-child(even):hover {
      transform: translateY(9px);
    }

    .testimonial-text {
      font-size: 0.975rem;
      color: var(--text-ink);
      line-height: 1.75;
    }

    .testimonial-author {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding-top: 16px;
      border-top: 1px solid var(--border-hairline);
      gap: 12px;
    }

    .author-role strong {
      display: block;
      font-size: 0.9375rem;
    }

    .author-role span {
      font-size: 0.8125rem;
      color: var(--text-slate);
    }

    .author-gain {
      font-size: 0.8125rem;
      font-weight: 700;
      color: var(--accent-emerald);
      background-color: var(--accent-emerald-light);
      padding: 4px 10px;
      border-radius: var(--radius-sm);
    }

    /* 11. Insights (Inline Expandable Briefs - No External Links) */
    .insights-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .insight-card {
      background-color: var(--bg-paper);
      border: 1px solid var(--border-hairline);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: grid;
      grid-template-columns: 0.42fr 0.58fr;
      transition: box-shadow var(--transition-base), border-color var(--transition-base);
    }

    .insight-card:hover {
      box-shadow: var(--shadow-lift);
      border-color: var(--accent-emerald);
    }

    .insight-thumb {
      height: 100%;
      min-height: 210px;
    }

    .insight-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .insight-body {
      padding: 22px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      gap: 12px;
    }

    .insight-cat {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--accent-gold);
    }

    .insight-title {
      font-size: 1.0625rem;
      font-weight: 700;
      line-height: 1.4;
      margin-bottom: 6px;
    }

    .insight-excerpt {
      font-size: 0.875rem;
      color: var(--text-slate);
      line-height: 1.65;
    }

    .insight-more-content {
      display: none;
      margin-top: 10px;
      padding-top: 10px;
      border-top: 1px dashed var(--border-hairline);
      font-size: 0.84375rem;
      color: var(--text-ink);
      line-height: 1.65;
    }

    .insight-card.is-expanded .insight-more-content {
      display: block;
    }

    .insight-actions {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      padding-top: 8px;
    }

    .insight-toggle {
      font-size: 0.84375rem;
      font-weight: 600;
      color: var(--accent-emerald);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    .insight-anchor {
      font-size: 0.8125rem;
      color: var(--text-slate);
    }

    .insight-anchor:hover {
      color: var(--accent-emerald);
    }

    /* 12. FAQ Accordion */
    .faq-layout {
      display: grid;
      grid-template-columns: 0.8fr 1.2fr;
      gap: 48px;
      align-items: start;
    }

    .faq-list {
      border-top: 1px solid var(--border-hairline);
    }

    .faq-item {
      border-bottom: 1px solid var(--border-hairline);
    }

    .faq-trigger {
      width: 100%;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
      text-align: left;
      font-size: 1.03125rem;
      font-weight: 600;
      color: var(--text-ink);
    }

    .faq-trigger:hover {
      color: var(--accent-emerald);
    }

    .faq-icon {
      width: 28px;
      height: 28px;
      border-radius: 50%;
      border: 1px solid var(--border-hairline);
      display: grid;
      place-items: center;
      font-size: 1rem;
      font-weight: 500;
      flex-shrink: 0;
      transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease;
    }

    .faq-trigger[aria-expanded="true"] .faq-icon {
      background-color: var(--accent-emerald);
      border-color: var(--accent-emerald);
      color: #FFFFFF;
    }

    .faq-panel {
      display: none;
      padding: 0 0 22px;
      font-size: 0.9375rem;
      color: var(--text-slate);
      line-height: 1.75;
    }

    .faq-panel.is-open {
      display: block;
    }

    /* 13. Contact & Conversion CTA */
    .cta-grid {
      display: grid;
      grid-template-columns: 0.95fr 1.05fr;
      gap: 48px;
      align-items: center;
    }

    .cta-promises {
      display: grid;
      gap: 14px;
      margin-top: 24px;
    }

    .cta-promise-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      font-size: 0.9375rem;
      color: var(--text-slate);
    }

    .cta-check {
      width: 22px;
      height: 22px;
      border-radius: 50%;
      background-color: var(--accent-emerald-light);
      color: var(--accent-emerald);
      display: grid;
      place-items: center;
      font-weight: 700;
      font-size: 0.75rem;
      flex-shrink: 0;
      margin-top: 3px;
    }

    .lead-form-card {
      background-color: var(--bg-paper);
      border: 1px solid var(--border-hairline);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-subtle);
    }

    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .form-group.full {
      grid-column: 1 / -1;
    }

    .form-label {
      font-size: 0.84375rem;
      font-weight: 600;
      color: var(--text-ink);
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-hairline);
      background-color: var(--bg-ivory);
      font-size: 0.9375rem;
      transition: border-color 0.2s ease, background-color 0.2s ease;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--accent-emerald);
      background-color: var(--bg-paper);
    }

    .form-privacy {
      font-size: 0.8125rem;
      color: var(--text-muted);
      margin: 14px 0 18px;
    }

    .form-feedback {
      display: none;
      margin-top: 16px;
      padding: 14px 16px;
      border-radius: var(--radius-sm);
      background-color: var(--accent-emerald-light);
      border: 1px solid var(--accent-emerald);
      color: var(--accent-emerald);
      font-size: 0.9rem;
      font-weight: 600;
    }

    .form-feedback.is-visible {
      display: block;
    }

    /* Footer */
    .site-footer {
      background-color: var(--bg-obsidian);
      color: var(--text-ivory-muted);
      padding: 64px 0 32px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr 1fr;
      gap: 48px;
      padding-bottom: 42px;
      border-bottom: 1px solid var(--border-dark);
    }

    .footer-brand {
      color: #FFFFFF;
      font-size: 1.125rem;
      font-weight: 700;
      margin-bottom: 12px;
    }

    .footer-desc {
      font-size: 0.9rem;
      line-height: 1.75;
      max-width: 380px;
      margin-bottom: 18px;
    }

    .footer-title {
      color: #FFFFFF;
      font-size: 0.9375rem;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .footer-links {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px 18px;
      font-size: 0.9rem;
    }

    .footer-links a:hover {
      color: #FFFFFF;
    }

    .footer-contact-list {
      display: grid;
      gap: 10px;
      font-size: 0.9rem;
    }

    .footer-bottom {
      padding-top: 24px;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
      font-size: 0.8125rem;
    }

    /* Scroll Reveal */
    .reveal-item {
      opacity: 0;
      transform: translateY(18px);
      transition: opacity 0.55s ease, transform 0.55s ease;
    }

    .reveal-item.is-visible {
      opacity: 1;
      transform: translateY(0);
    }

    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      .reveal-item { opacity: 1; transform: none; transition: none; }
    }

    /* Responsive Breakpoints */
    @media (max-width: 1024px) {
      .hero-inner,
      .pain-grid,
      .bento-arch,
      .product-lead,
      .dark-split,
      .story-panel.is-active,
      .faq-layout,
      .cta-grid {
        grid-template-columns: 1fr;
      }

      .adv-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .timeline-track {
        grid-template-columns: repeat(2, 1fr);
      }

      .timeline-track::before {
        display: none;
      }

      .step-card:nth-child(n) {
        margin-top: 0;
      }

      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
      }

      .metric-cell:nth-child(2n) {
        border-right: none;
      }

      .insights-grid {
        grid-template-columns: 1fr;
      }

      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .header-topbar {
        display: none;
      }

      .mobile-toggle {
        display: inline-flex;
      }

      .nav-menu-wrap {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: var(--bg-paper);
        flex-direction: column;
        align-items: stretch;
        padding: 24px;
        gap: 20px;
        border-top: 1px solid var(--border-hairline);
        transform: translateX(100%);
        transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
        z-index: 999;
        overflow-y: auto;
      }

      .nav-menu-wrap.is-open {
        transform: translateX(0);
      }

      .nav-links {
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
      }

      .nav-link {
        padding: 12px 4px;
        border-bottom: 1px solid var(--border-hairline);
        font-size: 1rem;
      }

      .nav-cta-desktop {
        width: 100%;
      }

      .section-block {
        padding: 60px 0;
      }

      .section-head-split {
        flex-direction: column;
        align-items: flex-start;
      }

      .adv-grid,
      .timeline-track,
      .product-asymmetric,
      .testimonial-grid,
      .form-grid,
      .spec-grid,
      .arch-layers-mini,
      .case-metrics-3,
      .story-kpis,
      .footer-grid {
        grid-template-columns: 1fr;
      }

      .testimonial-card:nth-child(even) {
        transform: none;
      }

      .insight-card {
        grid-template-columns: 1fr;
      }

      .insight-thumb {
        min-height: 180px;
        aspect-ratio: 16 / 9;
      }
    }

    @media (max-width: 520px) {
      .container {
        padding: 0 16px;
      }

      .hero-inner {
        padding: 48px 0 56px;
      }

      .hero-brief-panel,
      .bento-copy-card,
      .lead-form-card,
      .story-panel {
        padding: 20px;
      }

      .metrics-grid {
        grid-template-columns: 1fr;
      }

      .metric-cell {
        border-right: none;
        border-bottom: 1px solid var(--border-hairline);
        padding: 14px 0;
      }

      .metric-cell:last-child {
        border-bottom: none;
      }

      .countdown-grid {
        gap: 6px;
      }
    }