:root {
  --bg-obsidian: #07090E;
  --bg-carbon: #0D111A;
  --bg-elevated: #121826;
  --bg-glass: rgba(13, 17, 26, 0.78);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(0, 240, 255, 0.35);
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --accent-cyan: #00F0FF;
  --accent-sky: #38BDF8;
  --accent-indigo: #6366F1;
  --accent-emerald: #10B981;
  --accent-amber: #F59E0B;
  --font-display: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--bg-obsidian);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  background-color: var(--bg-obsidian);
  background-image:
    radial-gradient(circle at 18% 8%, rgba(0, 240, 255, 0.09) 0%, transparent 38%),
    radial-gradient(circle at 84% 16%, rgba(99, 102, 241, 0.10) 0%, transparent 42%),
    linear-gradient(180deg, rgba(7, 9, 14, 0.96) 0%, #07090E 100%);
  overflow-x: hidden;
  color: var(--text-primary);
}

/* Precision Architectural Grid Overlay */
.bg-grid-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-size: 56px 56px;
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, 0.022) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.022) 1px, transparent 1px);
  mask-image: radial-gradient(ellipse 90% 70% at 50% 15%, #000 40%, transparent 100%);
}

.container {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Top Telemetry Bar */
.telemetry-bar {
  position: relative;
  z-index: 20;
  background: rgba(10, 14, 23, 0.92);
  border-bottom: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 8px 0;
  color: var(--text-secondary);
}

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

.telemetry-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-emerald);
  box-shadow: 0 0 10px var(--accent-emerald);
}

.telemetry-metrics {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.telemetry-metrics span strong {
  color: var(--accent-cyan);
}

/* Sticky Glass Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(7, 9, 14, 0.82);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  gap: 24px;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
}

.brand-mark {
  width: 42px;
  height: 42px;
  flex-shrink: 0;
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

.brand-link:hover .brand-mark {
  transform: scale(1.06) rotate(-3deg);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  display: flex;
  align-items: center;
  gap: 6px;
}

.brand-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(0, 240, 255, 0.12);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 240, 255, 0.3);
}

.brand-sub {
  font-size: 11px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--accent-cyan);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: 10px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.22s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-sky) 55%, var(--accent-indigo) 100%);
  color: #04070D;
  font-weight: 700;
  box-shadow: 0 8px 24px rgba(0, 240, 255, 0.22);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 30px rgba(0, 240, 255, 0.34);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

.btn-outline:hover {
  border-color: var(--accent-cyan);
  background: rgba(0, 240, 255, 0.06);
}

/* Hero Section */
.hero-section {
  padding: 72px 0 64px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 44px;
  align-items: center;
}

.eyebrow-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid rgba(0, 240, 255, 0.25);
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  margin-bottom: 22px;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(36px, 4.6vw, 62px);
  font-weight: 700;
  line-height: 1.07;
  letter-spacing: -0.035em;
  margin-bottom: 22px;
}

.text-gradient {
  background: linear-gradient(95deg, #FFFFFF 0%, #00F0FF 48%, #818CF8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-lead {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 62ch;
  margin-bottom: 28px;
}

.hero-Feature-chips {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 32px;
}

.hero-chip {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 10px;
  background: rgba(18, 24, 38, 0.72);
  border: 1px solid var(--border-subtle);
  font-size: 13.5px;
  color: var(--text-primary);
}

.hero-chip svg {
  width: 18px;
  height: 18px;
  color: var(--accent-cyan);
  flex-shrink: 0;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.hero-trust-row {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  padding-top: 20px;
  border-top: 1px solid var(--border-subtle);
  font-size: 13px;
  color: var(--text-secondary);
}

.hero-trust-row strong {
  color: var(--text-primary);
  font-family: var(--font-mono);
}

/* Right Hero Telemetry Console */
.telemetry-card {
  background: linear-gradient(165deg, rgba(18, 24, 38, 0.92) 0%, rgba(10, 14, 22, 0.96) 100%);
  border: 1px solid rgba(0, 240, 255, 0.22);
  border-radius: 20px;
  padding: 26px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.55), inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

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

.console-dots {
  display: flex;
  gap: 6px;
}

.console-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
}

.console-dots span:nth-child(1) { background: #EF4444; }
.console-dots span:nth-child(2) { background: #F59E0B; }
.console-dots span:nth-child(3) { background: #10B981; }

.console-title {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent-cyan);
}

.benchmark-block {
  margin-bottom: 18px;
}

.benchmark-label {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  margin-bottom: 6px;
}

.benchmark-label strong {
  font-family: var(--font-mono);
  color: var(--accent-cyan);
}

.progress-track {
  height: 10px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: 999px;
}

.fill-nvme {
  width: 96%;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-indigo));
}

.fill-ssd {
  width: 14%;
  background: rgba(148, 163, 184, 0.45);
}

.console-kpis {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 20px;
}

.kpi-box {
  background: rgba(7, 9, 14, 0.68);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 14px;
}

.kpi-value {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
}

.kpi-caption {
  font-size: 12px;
  color: var(--text-secondary);
}

/* Section Headers */
.section {
  padding: 80px 0;
  border-top: 1px solid var(--border-subtle);
}

.section-header {
  max-width: 780px;
  margin-bottom: 44px;
}

.section-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-cyan);
  margin-bottom: 10px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.2vw, 42px);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.15;
  margin-bottom: 14px;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 16px;
}

/* 4 Core Pillars Bento */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.pillar-card {
  background: var(--bg-carbon);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 26px;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.pillar-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-highlight);
}

.pillar-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(0, 240, 255, 0.1);
  border: 1px solid rgba(0, 240, 255, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-weight: 700;
  margin-bottom: 18px;
}

.pillar-card h3 {
  font-family: var(--font-display);
  font-size: 18px;
  margin-bottom: 10px;
}

.pillar-card p {
  font-size: 14px;
  color: var(--text-secondary);
}

/* Pricing Controls */
.catalog-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 32px;
  padding: 16px 20px;
  background: var(--bg-carbon);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
}

.filter-tabs, .cycle-tabs {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.tab-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 9px 16px;
  border-radius: 10px;
  font-family: var(--font-display);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-btn.active, .tab-btn:hover {
  background: rgba(0, 240, 255, 0.12);
  color: var(--accent-cyan);
  border-color: rgba(0, 240, 255, 0.4);
}

/* Pricing Grid */
.plans-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.plan-card {
  position: relative;
  background: var(--bg-carbon);
  border: 1px solid var(--border-subtle);
  border-radius: 18px;
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.25s ease;
}

.plan-card:hover {
  border-color: rgba(0, 240, 255, 0.45);
  transform: translateY(-4px);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
}

.plan-card.popular {
  background: linear-gradient(180deg, rgba(0, 240, 255, 0.07) 0%, rgba(13, 17, 26, 0.98) 100%);
  border-color: var(--accent-cyan);
}

.plan-top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 12px;
}

.plan-code {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-secondary);
  padding: 3px 8px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.05);
}

.plan-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(0, 240, 255, 0.14);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 240, 255, 0.3);
}

.plan-name {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 4px;
}

.plan-cpu {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 18px;
}

.plan-price-box {
  padding: 16px 0;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 18px;
}

.price-vnd {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.price-unit {
  font-size: 13px;
  color: var(--text-secondary);
}

.price-meta {
  font-size: 12px;
  color: var(--accent-emerald);
  font-family: var(--font-mono);
  margin-top: 4px;
}

.plan-specs {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
  font-size: 13.5px;
}

.plan-specs li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  color: var(--text-secondary);
}

.plan-specs li strong {
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 13px;
}

/* Interactive Configurator */
.configurator-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 28px;
  background: var(--bg-carbon);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  padding: 32px;
}

.form-row {
  margin-bottom: 20px;
}

.form-row label {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
}

.form-control, .form-select {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  background: var(--bg-obsidian);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 14px;
}

.range-slider {
  width: 100%;
  accent-color: var(--accent-cyan);
  cursor: pointer;
}

.summary-panel {
  background: var(--bg-obsidian);
  border: 1px solid rgba(0, 240, 255, 0.25);
  border-radius: 16px;
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.summary-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 18px 0;
  font-size: 14px;
}

.summary-list li {
  display: flex;
  justify-content: space-between;
  color: var(--text-secondary);
}

.summary-list li strong {
  color: var(--text-primary);
  font-family: var(--font-mono);
}

.summary-total {
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
  margin-bottom: 20px;
}

.summary-total-price {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  color: var(--accent-cyan);
}

/* Comparison & Tech Spec Tables */
.table-wrap {
  overflow-x: auto;
  background: var(--bg-carbon);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 14px;
}

.spec-table th, .spec-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-subtle);
}

.spec-table th {
  background: rgba(255, 255, 255, 0.03);
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--text-primary);
}

.spec-table tr:last-child td {
  border-bottom: none;
}

.highlight-col {
  color: var(--accent-cyan);
  font-weight: 600;
}

/* Use Cases & Case Studies */
.usecases-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.usecase-card {
  background: var(--bg-carbon);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 24px;
}

.usecase-card h3 {
  font-family: var(--font-display);
  font-size: 18px;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.usecase-card p {
  font-size: 14px;
  color: var(--text-secondary);
}

/* FAQ Accordion */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-carbon);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  padding: 18px 22px;
}

.faq-item summary {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.faq-item p {
  margin-top: 12px;
  color: var(--text-secondary);
  font-size: 14.5px;
}

/* Footer */
.site-footer {
  padding: 64px 0 40px;
  border-top: 1px solid var(--border-subtle);
  background: #05070B;
  font-size: 14px;
  color: var(--text-secondary);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 36px;
  margin-bottom: 40px;
}

.footer-col h4 {
  font-family: var(--font-display);
  color: var(--text-primary);
  margin-bottom: 14px;
  font-size: 15px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-col a {
  color: var(--text-secondary);
  text-decoration: none;
}

.footer-col a:hover {
  color: var(--accent-cyan);
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
}

.quote-toast {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 10px;
  background: rgba(16, 185, 129, 0.14);
  border: 1px solid rgba(16, 185, 129, 0.4);
  color: #A7F3D0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  display: none;
}

@media (max-width: 1024px) {
  .hero-grid, .configurator-grid {
    grid-template-columns: 1fr;
  }
  .pillars-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .plans-grid, .usecases-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 680px) {
  .nav-links {
    display: none;
  }
  .pillars-grid, .plans-grid, .usecases-grid, .footer-grid, .hero-Feature-chips {
    grid-template-columns: 1fr;
  }
  .hero-section {
    padding: 44px 0;
  }
}