/* ═══════════════════════════════════════════════════
   Pearl Test Environment — Terraform Exploration Guide
   Styles — matching guide.css design system
   ═══════════════════════════════════════════════════ */

:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #1a2035;
  --bg-card-hover: #1f2847;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #3b82f6;
  --accent-glow: rgba(59, 130, 246, 0.3);
  --accent-light: #60a5fa;
  --accent-2: #8b5cf6;
  --accent-2-glow: rgba(139, 92, 246, 0.3);
  --success: #10b981;
  --success-glow: rgba(16, 185, 129, 0.3);
  --warning: #f59e0b;
  --warning-glow: rgba(245, 158, 11, 0.3);
  --danger: #ef4444;
  --danger-glow: rgba(239, 68, 68, 0.3);
  --border: rgba(255, 255, 255, 0.06);
  --glass: rgba(255, 255, 255, 0.03);
  --glass-border: rgba(255, 255, 255, 0.08);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.4);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --sidebar-width: 280px;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; scrollbar-width: thin; scrollbar-color: var(--accent) var(--bg-primary); }
body { font-family: var(--font); background: var(--bg-primary); color: var(--text-primary); line-height: 1.7; overflow-x: hidden; -webkit-font-smoothing: antialiased; }
body.tg-nav-open { overflow: hidden; }
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 3px; }

/* ───── Top Bar ───── */
.tg-topbar {
  position: fixed; top: 0; left: 0; right: 0; height: 56px;
  background: rgba(10, 14, 23, 0.92); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border); z-index: 1000;
  display: flex; align-items: center; padding: 0 24px; gap: 16px;
}
.tg-topbar-back { display: inline-flex; align-items: center; gap: 6px; color: var(--text-secondary); text-decoration: none; font-size: 0.85rem; font-weight: 500; transition: color 0.2s; white-space: nowrap; }
.tg-topbar-back:hover { color: var(--accent-light); }
.tg-topbar-title { font-size: 0.95rem; font-weight: 700; color: var(--text-primary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tg-topbar-badge { display: inline-flex; align-items: center; padding: 3px 10px; background: rgba(139, 92, 246, 0.15); border: 1px solid rgba(139, 92, 246, 0.3); border-radius: 999px; font-size: 0.7rem; font-weight: 700; color: #a78bfa; text-transform: uppercase; letter-spacing: 0.05em; white-space: nowrap; }
.tg-topbar-sep { width: 1px; height: 24px; background: var(--border); flex-shrink: 0; }
.tg-mobile-toggle { display: none; background: none; border: 1px solid var(--glass-border); border-radius: var(--radius-sm); color: var(--text-secondary); padding: 6px 10px; font-size: 1.1rem; cursor: pointer; margin-left: auto; }

/* ───── Progress Bar ───── */
.tg-progress { position: fixed; top: 56px; left: var(--sidebar-width); right: 0; height: 3px; z-index: 999; }
.tg-progress-bar { height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-2)); width: 0%; transition: width 0.1s linear; box-shadow: 0 0 8px var(--accent-glow); }

/* ───── Sidebar ───── */
.tg-sidebar {
  position: fixed; top: 56px; left: 0; bottom: 0; width: var(--sidebar-width);
  background: var(--bg-secondary); border-right: 1px solid var(--border);
  overflow-y: auto; z-index: 900; padding: 16px 0;
  scrollbar-width: thin; scrollbar-color: var(--accent) transparent; transition: transform 0.3s ease;
}
.tg-sidebar::-webkit-scrollbar { width: 4px; }
.tg-sidebar::-webkit-scrollbar-thumb { background: rgba(59, 130, 246, 0.3); border-radius: 2px; }
.tg-sidebar-section { margin-bottom: 8px; }
.tg-sidebar-heading { font-size: 0.65rem; font-weight: 800; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-muted); padding: 8px 20px 4px; }
.tg-sidebar-link { display: flex; align-items: center; gap: 10px; padding: 7px 20px; color: var(--text-secondary); text-decoration: none; font-size: 0.82rem; transition: all 0.2s; border-left: 3px solid transparent; -webkit-tap-highlight-color: transparent; }
.tg-sidebar-link:hover { color: var(--text-primary); background: rgba(255, 255, 255, 0.03); }
.tg-sidebar-link.active { color: var(--accent-light); background: rgba(59, 130, 246, 0.08); border-left-color: var(--accent); }
.tg-sidebar-icon { font-size: 1rem; flex-shrink: 0; width: 22px; text-align: center; }

/* ───── Main Content ───── */
.tg-main { margin-left: var(--sidebar-width); margin-top: 56px; min-height: calc(100vh - 56px); width: calc(100% - var(--sidebar-width)); }

.tg-section { padding: 60px 48px 80px; border-bottom: 1px solid var(--border); max-width: 1100px; }
.tg-section:last-child { border-bottom: none; }
.tg-section-dark { background: var(--bg-secondary); max-width: none; }
.tg-section-dark .tg-section-inner { max-width: 1100px; }
.tg-section-number { display: inline-block; font-size: 3rem; font-weight: 800; background: linear-gradient(135deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; opacity: 0.3; line-height: 1; margin-bottom: 0.5rem; }
.tg-section h2 { font-size: 2.2rem; font-weight: 800; margin-bottom: 0.5rem; letter-spacing: -0.02em; line-height: 1.2; }
.tg-section h3 { font-size: 1.4rem; font-weight: 700; margin: 2rem 0 0.75rem; color: var(--text-primary); }
.tg-section h4 { font-size: 1.1rem; font-weight: 700; margin: 1.5rem 0 0.5rem; color: var(--accent-light); }
.tg-lead { font-size: 1.1rem; color: var(--text-secondary); max-width: 720px; margin-bottom: 2rem; line-height: 1.8; }
.tg-section p { color: var(--text-secondary); line-height: 1.8; margin-bottom: 1rem; }
.tg-section strong { color: var(--text-primary); }
.tg-section code { background: rgba(59, 130, 246, 0.1); border: 1px solid rgba(59, 130, 246, 0.2); padding: 1px 6px; border-radius: 4px; font-family: var(--font-mono); font-size: 0.85em; color: var(--accent-light); }
.tg-section kbd { background: var(--bg-card); border: 1px solid var(--glass-border); padding: 2px 8px; border-radius: 4px; font-family: var(--font-mono); font-size: 0.82em; color: var(--text-primary); box-shadow: 0 2px 0 rgba(0,0,0,0.3); }

/* ───── Hero ───── */
.tg-hero {
  position: relative; padding: 80px 48px 60px;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(139, 92, 246, 0.14) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(59, 130, 246, 0.12) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(16, 185, 129, 0.06) 0%, transparent 50%);
  border-bottom: 1px solid var(--border); max-width: none;
}
.tg-hero-inner { max-width: 860px; }
.tg-hero-badge { display: inline-block; padding: 4px 14px; background: rgba(139, 92, 246, 0.15); border: 1px solid rgba(139, 92, 246, 0.3); border-radius: 999px; font-size: 0.75rem; font-weight: 700; color: #a78bfa; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 1rem; }
.tg-hero h1 { font-size: 2.8rem; font-weight: 900; letter-spacing: -0.03em; line-height: 1.15; margin-bottom: 1rem; background: linear-gradient(135deg, #fff 0%, #e2e8f0 30%, var(--accent-light) 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.tg-hero-subtitle { font-size: 1.15rem; color: var(--text-secondary); max-width: 700px; line-height: 1.8; margin-bottom: 1.5rem; }
.tg-hero-stats { display: flex; gap: 2rem; flex-wrap: wrap; margin-bottom: 2rem; }
.tg-hero-stat { text-align: center; }
.tg-hero-stat-value { display: block; font-size: 1.8rem; font-weight: 800; color: var(--accent-light); }
.tg-hero-stat-label { font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; }
.tg-hero-context { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.tg-context-card { display: flex; gap: 12px; padding: 1rem 1.25rem; background: var(--bg-card); border: 1px solid var(--glass-border); border-radius: var(--radius); }
.tg-context-icon { font-size: 1.5rem; flex-shrink: 0; }
.tg-context-card strong { display: block; color: var(--text-primary); margin-bottom: 4px; font-size: 0.9rem; }
.tg-context-card p { font-size: 0.85rem; color: var(--text-muted); margin: 0; line-height: 1.5; }

/* ───── Lists ───── */
.tg-list { list-style: none; margin: 1rem 0 1.5rem; }
.tg-list li { display: flex; align-items: flex-start; gap: 10px; padding: 6px 0; font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }
.tg-list li::before { content: '▸'; flex-shrink: 0; color: var(--accent-light); margin-top: 1px; }
ol.tg-list { counter-reset: tg-counter; }
ol.tg-list li { counter-increment: tg-counter; }
ol.tg-list li::before { content: counter(tg-counter) '.'; color: var(--accent-light); font-weight: 700; min-width: 1.5em; }

/* ───── Info Boxes ───── */
.tg-info-box { background: linear-gradient(135deg, rgba(59, 130, 246, 0.08), rgba(139, 92, 246, 0.08)); border: 1px solid rgba(59, 130, 246, 0.2); border-radius: var(--radius); padding: 1.25rem 1.5rem; margin: 1.5rem 0; }
.tg-info-box h4 { font-size: 1rem; margin: 0 0 0.5rem; color: var(--accent-light); }
.tg-info-box p { font-size: 0.9rem; margin: 0 0 0.5rem; }
.tg-info-box p:last-child { margin-bottom: 0; }
.tg-info-box.warning { background: linear-gradient(135deg, rgba(245, 158, 11, 0.08), rgba(239, 68, 68, 0.05)); border-color: rgba(245, 158, 11, 0.25); }
.tg-info-box.warning h4 { color: var(--warning); }
.tg-info-box.success { background: linear-gradient(135deg, rgba(16, 185, 129, 0.08), rgba(59, 130, 246, 0.05)); border-color: rgba(16, 185, 129, 0.25); }
.tg-info-box.success h4 { color: var(--success); }
.tg-info-box.danger { background: linear-gradient(135deg, rgba(239, 68, 68, 0.08), rgba(239, 68, 68, 0.05)); border-color: rgba(239, 68, 68, 0.25); }
.tg-info-box.danger h4 { color: var(--danger); }

/* ───── Tables ───── */
.tg-table-wrap { overflow-x: auto; margin: 1rem 0 1.5rem; border-radius: var(--radius); border: 1px solid var(--glass-border); }
.tg-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; min-width: 500px; }
.tg-table th { background: rgba(59, 130, 246, 0.1); padding: 10px 14px; text-align: left; font-weight: 700; color: var(--accent-light); border-bottom: 1px solid var(--border); white-space: nowrap; }
.tg-table td { padding: 8px 14px; border-bottom: 1px solid var(--border); color: var(--text-secondary); }
.tg-table tr:last-child td { border-bottom: none; }
.tg-table tr:hover td { background: rgba(255, 255, 255, 0.02); }
.tg-text-success { color: var(--success) !important; }
.tg-text-danger { color: var(--danger) !important; }

/* ───── Code Blocks ───── */
.tg-cmd { background: rgba(0, 0, 0, 0.4); border: 1px solid var(--glass-border); border-radius: var(--radius-sm); padding: 14px 18px; margin: 0.75rem 0; font-family: var(--font-mono); font-size: 0.82rem; color: var(--accent-light); overflow-x: auto; white-space: pre-wrap; word-break: break-word; line-height: 1.7; }
.tg-cmd-comment { color: var(--text-muted); }
.tg-code-block { margin: 1rem 0; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--glass-border); }
.tg-code-header { padding: 8px 16px; background: rgba(59, 130, 246, 0.1); font-size: 0.75rem; font-weight: 700; color: var(--accent-light); font-family: var(--font-mono); border-bottom: 1px solid var(--glass-border); }
.tg-code-block .tg-cmd { border: none; border-radius: 0; margin: 0; }

/* ───── Steps ───── */
.tg-step { margin: 2rem 0; padding: 1.5rem; background: var(--bg-card); border: 1px solid var(--glass-border); border-radius: var(--radius); border-left: 4px solid var(--accent); }
.tg-step-header { display: flex; align-items: center; gap: 12px; margin-bottom: 1rem; }
.tg-step-number { display: inline-flex; align-items: center; justify-content: center; width: 32px; height: 32px; background: linear-gradient(135deg, var(--accent), var(--accent-2)); border-radius: 50%; font-size: 0.85rem; font-weight: 800; color: white; flex-shrink: 0; }
.tg-step-title { font-size: 1.1rem; font-weight: 700; color: var(--text-primary); }
.tg-step p { font-size: 0.9rem; }

/* ───── Phase Banner ───── */
.tg-phase-banner { display: flex; align-items: center; gap: 16px; padding: 1.25rem 1.5rem; background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(59, 130, 246, 0.06)); border: 1px solid rgba(139, 92, 246, 0.2); border-radius: var(--radius); margin-bottom: 2rem; }
.tg-phase-icon { font-size: 2.5rem; flex-shrink: 0; }
.tg-phase-meta h3 { margin: 0 0 0.25rem; font-size: 1.1rem; }
.tg-phase-meta p { margin: 0; font-size: 0.85rem; color: var(--text-muted); }
.tg-phase-cost { margin-left: auto; text-align: right; flex-shrink: 0; }
.tg-phase-cost span { display: block; font-size: 1.5rem; font-weight: 800; color: var(--success); }
.tg-phase-cost small { font-size: 0.75rem; color: var(--text-muted); }

/* ───── Architecture Diagram ───── */
.tg-arch-diagram { background: var(--bg-card); border: 1px solid var(--glass-border); border-radius: var(--radius-lg); padding: 2rem; margin: 1.5rem 0; }
.tg-arch-row { margin-bottom: 0.75rem; }
.tg-arch-block { padding: 1.25rem; border-radius: var(--radius); border: 1px solid var(--glass-border); }
.tg-arch-hub { background: linear-gradient(135deg, rgba(59, 130, 246, 0.08), rgba(139, 92, 246, 0.04)); border-color: rgba(59, 130, 246, 0.2); }
.tg-arch-spoke { background: linear-gradient(135deg, rgba(16, 185, 129, 0.06), rgba(59, 130, 246, 0.04)); border-color: rgba(16, 185, 129, 0.2); }
.tg-arch-label { font-size: 0.9rem; font-weight: 700; margin-bottom: 0.75rem; color: var(--text-primary); }
.tg-arch-items { display: flex; gap: 1rem; flex-wrap: wrap; }
.tg-arch-item { padding: 6px 14px; background: var(--bg-secondary); border: 1px solid var(--glass-border); border-radius: var(--radius-sm); font-size: 0.82rem; color: var(--text-secondary); }
.tg-arch-item small { color: var(--text-muted); font-size: 0.75em; }
.tg-arch-connector { text-align: center; font-size: 0.85rem; font-weight: 700; color: var(--accent-light); padding: 0.5rem 0; }
.tg-arch-subnets { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 0.75rem; }
.tg-arch-subnet { padding: 10px 14px; background: var(--bg-secondary); border-radius: var(--radius-sm); border-left: 3px solid var(--accent); font-size: 0.82rem; }
.tg-arch-subnet strong { display: block; color: var(--text-primary); font-size: 0.85rem; }
.tg-arch-subnet small { color: var(--text-muted); font-size: 0.75em; }
.tg-arch-subnet span { display: block; color: var(--text-secondary); font-size: 0.78rem; margin-top: 2px; }
.tg-subnet-web { border-left-color: var(--accent); }
.tg-subnet-worker { border-left-color: var(--accent-2); }
.tg-subnet-build { border-left-color: var(--warning); }
.tg-subnet-data { border-left-color: var(--success); }
.tg-arch-services-row { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-top: 0.5rem; }
.tg-arch-service { padding: 6px 14px; background: var(--bg-card); border: 1px solid var(--glass-border); border-radius: var(--radius-sm); font-size: 0.82rem; color: var(--text-secondary); }

/* ───── Now Grid (What we deploy) ───── */
.tg-now-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1rem; margin: 1.5rem 0; }
.tg-now-card { padding: 1.25rem; border-radius: var(--radius); }
.tg-now-card h4 { font-size: 1rem; margin: 0 0 0.75rem; }
.tg-now-card ul { list-style: none; }
.tg-now-card li { font-size: 0.85rem; color: var(--text-secondary); padding: 3px 0; }
.tg-now-card li::before { content: '• '; color: var(--text-muted); }
.tg-now-yes { background: linear-gradient(135deg, rgba(16, 185, 129, 0.08), rgba(16, 185, 129, 0.02)); border: 1px solid rgba(16, 185, 129, 0.2); }
.tg-now-yes h4 { color: var(--success); }
.tg-now-code { background: linear-gradient(135deg, rgba(245, 158, 11, 0.08), rgba(245, 158, 11, 0.02)); border: 1px solid rgba(245, 158, 11, 0.2); }
.tg-now-code h4 { color: var(--warning); }
.tg-now-skip { background: linear-gradient(135deg, rgba(100, 116, 139, 0.08), rgba(100, 116, 139, 0.02)); border: 1px solid rgba(100, 116, 139, 0.2); }
.tg-now-skip h4 { color: var(--text-muted); }

/* ───── Comparison Grid ───── */
.tg-compare-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 1.5rem 0; }
.tg-compare-card { padding: 1.25rem; border-radius: var(--radius); }
.tg-compare-card h4 { font-size: 1rem; margin: 0 0 0.75rem; }
.tg-compare-card ul { list-style: none; }
.tg-compare-card li { font-size: 0.85rem; color: var(--text-secondary); padding: 4px 0; padding-left: 1.2em; text-indent: -1.2em; }
.tg-compare-bad { background: linear-gradient(135deg, rgba(239, 68, 68, 0.06), rgba(239, 68, 68, 0.02)); border: 1px solid rgba(239, 68, 68, 0.2); }
.tg-compare-bad h4 { color: var(--danger); }
.tg-compare-good { background: linear-gradient(135deg, rgba(16, 185, 129, 0.06), rgba(16, 185, 129, 0.02)); border: 1px solid rgba(16, 185, 129, 0.2); }
.tg-compare-good h4 { color: var(--success); }

/* ───── Lifecycle ───── */
.tg-lifecycle { display: flex; align-items: stretch; gap: 0; margin: 1.5rem 0; flex-wrap: wrap; }
.tg-lifecycle-step { flex: 1; min-width: 140px; padding: 1rem; background: var(--bg-card); border: 1px solid var(--glass-border); border-radius: var(--radius); text-align: center; }
.tg-lifecycle-num { display: inline-flex; align-items: center; justify-content: center; width: 28px; height: 28px; background: linear-gradient(135deg, var(--accent), var(--accent-2)); border-radius: 50%; font-size: 0.75rem; font-weight: 800; color: white; margin-bottom: 0.5rem; }
.tg-lifecycle-content strong { display: block; font-size: 0.82rem; color: var(--text-primary); margin-bottom: 4px; }
.tg-lifecycle-content p { font-size: 0.75rem; color: var(--text-muted); margin: 0; }
.tg-lifecycle-arrow { display: flex; align-items: center; justify-content: center; width: 32px; font-size: 1.2rem; color: var(--accent-light); flex-shrink: 0; }

/* ───── Expensive Resources Grid ───── */
.tg-expensive-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 1rem; margin: 1.5rem 0; }
.tg-expensive-card { padding: 1.25rem; background: var(--bg-card); border: 1px solid rgba(239, 68, 68, 0.15); border-radius: var(--radius); text-align: center; transition: var(--transition); }
.tg-expensive-card:hover { border-color: rgba(239, 68, 68, 0.3); transform: translateY(-2px); }
.tg-expensive-icon { font-size: 2rem; margin-bottom: 0.5rem; }
.tg-expensive-card h4 { font-size: 1rem; margin: 0 0 0.5rem; color: var(--text-primary); }
.tg-expensive-card p { font-size: 0.82rem; color: var(--text-muted); margin: 0 0 0.75rem; }
.tg-expensive-cost { display: inline-block; padding: 4px 14px; background: rgba(239, 68, 68, 0.1); border: 1px solid rgba(239, 68, 68, 0.25); border-radius: 999px; font-size: 0.8rem; font-weight: 700; color: var(--danger); }

/* ───── Destroy Demo ───── */
.tg-destroy-demo { display: flex; flex-direction: column; align-items: center; gap: 0; margin: 2rem 0; }
.tg-destroy-step { width: 100%; max-width: 500px; padding: 1.25rem; background: var(--bg-card); border: 1px solid var(--glass-border); border-radius: var(--radius); text-align: center; }
.tg-destroy-cmd { font-family: var(--font-mono); font-size: 1rem; font-weight: 700; color: var(--accent-light); margin-bottom: 0.25rem; }
.tg-destroy-desc { font-size: 0.82rem; color: var(--text-muted); }
.tg-destroy-arrow { font-size: 1.5rem; color: var(--accent-light); padding: 0.25rem 0; }

/* ───── Pipeline Cards ───── */
.tg-pipeline-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1rem; margin: 1.5rem 0; }
.tg-pipeline-card { padding: 1.25rem; background: var(--bg-card); border: 1px solid var(--glass-border); border-radius: var(--radius); transition: var(--transition); }
.tg-pipeline-card:hover { border-color: rgba(59, 130, 246, 0.3); transform: translateY(-2px); }
.tg-pipeline-header { display: flex; align-items: center; gap: 10px; margin-bottom: 0.75rem; }
.tg-pipeline-icon { font-size: 1.5rem; }
.tg-pipeline-card h4 { margin: 0; font-size: 0.95rem; color: var(--text-primary); font-family: var(--font-mono); }
.tg-pipeline-card p { font-size: 0.85rem; color: var(--text-secondary); margin: 0 0 0.5rem; }
.tg-pipeline-badge { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: 0.65rem; font-weight: 700; text-transform: uppercase; margin-right: 4px; }
.tg-badge-blue { background: rgba(59, 130, 246, 0.15); border: 1px solid rgba(59, 130, 246, 0.3); color: var(--accent-light); }
.tg-badge-green { background: rgba(16, 185, 129, 0.15); border: 1px solid rgba(16, 185, 129, 0.3); color: var(--success); }
.tg-badge-red { background: rgba(239, 68, 68, 0.15); border: 1px solid rgba(239, 68, 68, 0.3); color: var(--danger); }
.tg-badge-purple { background: rgba(139, 92, 246, 0.15); border: 1px solid rgba(139, 92, 246, 0.3); color: #a78bfa; }

/* ───── Workflow Steps ───── */
.tg-workflow { margin: 1.5rem 0; position: relative; padding-left: 32px; }
.tg-workflow::before { content: ''; position: absolute; left: 15px; top: 16px; bottom: 16px; width: 2px; background: linear-gradient(to bottom, var(--accent), var(--accent-2)); opacity: 0.3; }
.tg-workflow-step { display: flex; align-items: flex-start; gap: 12px; padding: 8px 0; position: relative; }
.tg-workflow-num { display: inline-flex; align-items: center; justify-content: center; width: 28px; height: 28px; background: linear-gradient(135deg, var(--accent), var(--accent-2)); border-radius: 50%; font-size: 0.7rem; font-weight: 800; color: white; flex-shrink: 0; z-index: 1; margin-left: -32px; }
.tg-workflow-step div { font-size: 0.9rem; color: var(--text-secondary); }
.tg-workflow-step strong { color: var(--text-primary); }

/* ───── Transition Steps ───── */
.tg-transition-steps { display: flex; flex-direction: column; gap: 1rem; margin: 1.5rem 0; }
.tg-transition-step { display: flex; align-items: flex-start; gap: 16px; padding: 1.25rem; background: var(--bg-card); border: 1px solid var(--glass-border); border-radius: var(--radius); }
.tg-transition-num { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; background: linear-gradient(135deg, var(--accent), var(--accent-2)); border-radius: 50%; font-size: 0.85rem; font-weight: 800; color: white; flex-shrink: 0; }
.tg-transition-step h4 { margin: 0 0 4px; font-size: 1rem; color: var(--text-primary); }
.tg-transition-step p { margin: 0; font-size: 0.85rem; color: var(--text-muted); }

/* ───── Troubleshooting ───── */
.tg-trouble-grid { display: flex; flex-direction: column; gap: 1rem; margin: 1.5rem 0; }
.tg-trouble-card { padding: 1.25rem; background: var(--bg-card); border: 1px solid var(--glass-border); border-radius: var(--radius); border-left: 4px solid var(--danger); }
.tg-trouble-card h4 { font-size: 0.9rem; font-family: var(--font-mono); color: var(--danger); margin: 0 0 0.5rem; }
.tg-trouble-cause { font-size: 0.82rem; color: var(--text-muted); margin-bottom: 0.5rem; font-style: italic; }
.tg-trouble-card .tg-cmd { margin: 0.5rem 0 0; }

/* ───── Folder Tree ───── */
.tg-folder-tree { background: var(--bg-card); border: 1px solid var(--glass-border); border-radius: var(--radius); padding: 1.5rem; margin: 1rem 0; font-family: var(--font-mono); font-size: 0.82rem; line-height: 1.8; }
.tg-folder { padding-left: 1.5rem; color: var(--accent-light); }
.tg-folder::before { content: '📁 '; }
.tg-file { padding-left: 1.5rem; color: var(--text-secondary); }
.tg-file::before { content: '📄 '; }
.tg-folder-desc { color: var(--text-muted); font-size: 0.75em; font-style: italic; }

/* ───── Footer ───── */
.tg-footer { margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--border); text-align: center; }
.tg-footer p { font-size: 0.95rem; color: var(--text-secondary); max-width: 600px; margin: 0 auto 1.5rem; }
.tg-footer-back { display: inline-flex; align-items: center; gap: 8px; padding: 12px 28px; background: linear-gradient(135deg, var(--accent), var(--accent-2)); border-radius: var(--radius); color: white; text-decoration: none; font-weight: 700; font-size: 0.9rem; transition: var(--transition); }
.tg-footer-back:hover { transform: translateY(-2px); box-shadow: var(--shadow); }

/* ───── Global Touch & Accessibility ───── */
.tg-video-preview:focus-visible,
.tg-sidebar-link:focus-visible,
.tg-doc-card:focus-visible,
.tg-footer-back:focus-visible {
  outline: 2px solid var(--accent-light);
  outline-offset: 2px;
}

/* ───── Responsive ───── */
@media (max-width: 1024px) {
  .tg-sidebar { width: min(88vw, 320px); transform: translateX(-100%); box-shadow: 0 18px 48px rgba(0, 0, 0, 0.4); }
  .tg-sidebar.open { transform: translateX(0); }
  .tg-main { margin-left: 0; width: 100%; }
  .tg-progress { left: 0; }
  .tg-mobile-toggle { display: block; min-height: 44px; min-width: 44px; }

  .tg-video-card:hover,
  .tg-video-card:active,
  .tg-doc-card:hover,
  .tg-pipeline-card:hover,
  .tg-expensive-card:hover {
    transform: none;
  }
  .tg-topbar-title { flex: 1; min-width: 0; }
  .tg-section { padding: 40px 24px 60px; max-width: 100%; }
  .tg-hero { padding: 60px 24px 40px; }
  .tg-hero h1 { font-size: 2rem; }
  .tg-hero-context { grid-template-columns: 1fr; }
  .tg-compare-grid { grid-template-columns: 1fr; }
  .tg-lifecycle { flex-direction: column; align-items: center; }
  .tg-lifecycle-arrow { transform: rotate(90deg); width: auto; height: 32px; }
}

@media (max-width: 600px) {
  .tg-topbar { gap: 8px; padding: 0 12px; }
  .tg-topbar-back { font-size: 0.78rem; }
  .tg-topbar-title { font-size: 0.8rem; }
  .tg-hero h1 { font-size: 1.6rem; }
  .tg-section h2 { font-size: 1.6rem; }
  .tg-phase-banner { flex-direction: column; text-align: center; }
  .tg-phase-cost { margin-left: 0; }
  .tg-hero-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
  .tg-now-grid { grid-template-columns: 1fr; }
  .tg-arch-subnets { grid-template-columns: 1fr; }
  .tg-section { padding: 32px 16px 48px; }
  .tg-hero { padding: 48px 16px 32px; }
  .tg-step, .tg-info-box, .tg-phase-banner { padding: 1rem; }
  .tg-topbar-badge, .tg-topbar-sep { display: none; }
  .tg-pipeline-grid { grid-template-columns: 1fr; }
  .tg-expensive-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 420px) {
  .tg-hero-stats { grid-template-columns: 1fr; }
  .tg-expensive-grid { grid-template-columns: 1fr; }

  .tg-section h2 { font-size: 1.35rem; }
  .tg-hero h1 { font-size: 1.35rem; }
  .tg-section { padding: 24px 12px 36px; }
  .tg-hero { padding: 40px 12px 24px; }
  .tg-topbar { padding: 0 8px; }
  .tg-topbar-back { font-size: 0.72rem; gap: 4px; }
  .tg-topbar-title { font-size: 0.72rem; max-width: 100px; }
  .tg-cmd { font-size: 0.72rem; padding: 10px 12px; }
  .tg-table { min-width: 480px; font-size: 0.75rem; }
  .tg-sidebar-link { min-height: 44px; padding: 10px 20px; }
  .tg-step-title { font-size: 0.95rem; }
  .tg-section-number { font-size: 2rem; }
  .tg-arch-diagram { padding: 1rem; }
  .tg-arch-items { gap: 0.5rem; }
  .tg-destroy-step { padding: 1rem; }
  .tg-context-card { flex-direction: column; gap: 8px; }
}

@media (max-width: 360px) {
  .tg-hero h1 { font-size: 1.2rem; }
  .tg-section h2 { font-size: 1.2rem; }
  .tg-section { padding: 20px 10px 32px; }
  .tg-hero { padding: 36px 10px 20px; }
}

/* ───── Video Grid & Cards ───── */
.tg-video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
  margin: 1.5rem 0 2rem;
}

.tg-video-card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.3s ease;
}

.tg-video-card:hover {
  border-color: rgba(59, 130, 246, 0.3);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.tg-video-embed {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%;
  background: var(--bg-secondary);
  overflow: hidden;
}

.tg-video-embed iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  border: none;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.tg-video-embed.is-loaded iframe {
  opacity: 1;
  pointer-events: auto;
}

/* ───── YouTube Thumbnail Preview ───── */
.tg-video-preview {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  padding: 0;
  background:
    linear-gradient(180deg, rgba(10, 14, 23, 0.08) 0%, rgba(10, 14, 23, 0.5) 100%),
    var(--bg-secondary);
  cursor: pointer;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.tg-video-preview:hover { transform: scale(1.01); }
.tg-video-preview:focus-visible { outline: 2px solid var(--accent-light); outline-offset: -2px; }

.tg-video-thumb {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
}

.tg-video-preview::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(10, 14, 23, 0.1) 0%, rgba(10, 14, 23, 0.6) 100%),
    radial-gradient(circle at center, rgba(59, 130, 246, 0.15) 0%, transparent 45%);
}

.tg-video-play {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 72px; height: 72px;
  border-radius: 50%;
  background: rgba(10, 14, 23, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.tg-video-play::before {
  content: '';
  margin-left: 4px;
  border-top: 12px solid transparent;
  border-bottom: 12px solid transparent;
  border-left: 20px solid white;
}

.tg-video-duration {
  position: absolute;
  right: 12px; bottom: 12px;
  z-index: 1;
  padding: 4px 8px;
  background: rgba(10, 14, 23, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-primary);
  text-transform: uppercase;
}

.tg-video-embed.is-loaded .tg-video-preview {
  opacity: 0;
  pointer-events: none;
}

.tg-video-info { padding: 12px 16px; }

.tg-video-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
  line-height: 1.4;
}

.tg-video-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.tg-video-channel { font-size: 0.72rem; color: var(--text-muted); }

.tg-video-tag {
  display: inline-flex;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
}

.tg-video-tag.beginner { background: rgba(16, 185, 129, 0.15); border: 1px solid rgba(16, 185, 129, 0.3); color: var(--success); }
.tg-video-tag.intermediate { background: rgba(59, 130, 246, 0.15); border: 1px solid rgba(59, 130, 246, 0.3); color: var(--accent-light); }
.tg-video-tag.advanced { background: rgba(139, 92, 246, 0.15); border: 1px solid rgba(139, 92, 246, 0.3); color: #a78bfa; }
.tg-video-tag.essential { background: rgba(239, 68, 68, 0.15); border: 1px solid rgba(239, 68, 68, 0.3); color: var(--danger); }

/* ───── Featured Video (full-width) ───── */
.tg-video-featured {
  margin: 1.5rem 0 2rem;
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.tg-video-featured .tg-video-embed { padding-bottom: 45%; max-height: 480px; }
.tg-video-featured .tg-video-info { padding: 16px 20px; }
.tg-video-featured .tg-video-title { font-size: 1rem; }

/* ───── Documentation Cards Grid ───── */
.tg-docs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1rem;
  margin: 1rem 0 2rem;
}

.tg-doc-card {
  display: flex;
  gap: 14px;
  padding: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  text-decoration: none;
  transition: var(--transition);
}

.tg-doc-card:hover {
  border-color: rgba(59, 130, 246, 0.3);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.tg-doc-icon { font-size: 1.6rem; flex-shrink: 0; margin-top: 2px; }
.tg-doc-card strong { display: block; color: var(--text-primary); font-size: 0.9rem; margin-bottom: 4px; }
.tg-doc-card p { font-size: 0.82rem; color: var(--text-muted); margin: 0; line-height: 1.5; }
.tg-doc-card code { background: rgba(59, 130, 246, 0.1); border: 1px solid rgba(59, 130, 246, 0.2); padding: 1px 5px; border-radius: 3px; font-family: var(--font-mono); font-size: 0.8em; color: var(--accent-light); }

.tg-doc-highlight {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.06), rgba(139, 92, 246, 0.04));
  border-color: rgba(59, 130, 246, 0.2);
}

/* ───── Video & Docs Responsive ───── */
@media (max-width: 1024px) {
  .tg-docs-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .tg-video-grid { grid-template-columns: 1fr; }
  .tg-video-featured .tg-video-embed { padding-bottom: 56.25%; max-height: none; }
  .tg-docs-grid { grid-template-columns: 1fr; }
  .tg-doc-card { padding: 1rem; gap: 10px; }
  .tg-doc-icon { font-size: 1.3rem; }
  .tg-doc-card strong { font-size: 0.82rem; }
  .tg-doc-card p { font-size: 0.78rem; }
}

@media (max-width: 420px) {
  .tg-video-play { width: 56px; height: 56px; }
  .tg-video-play::before { border-top-width: 10px; border-bottom-width: 10px; border-left-width: 16px; }
  .tg-video-info { padding: 10px 12px; }
  .tg-video-title { font-size: 0.8rem; }
  .tg-video-channel { font-size: 0.68rem; }
}