:root {
  --bg-page: #f1f5f9;
  --bg-panel: #ffffff;
  --bg-obsidian: #0b111e;
  --bg-slate: #131d31;
  --bg-ice: #e2e8f0;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-light: #f8fafc;
  --cobalt: #2563eb;
  --cobalt-dark: #1d4ed8;
  --cyan: #0284c7;
  --border-grid: #cbd5e1;
  --border-dark: #1e293b;
  --ok: #059669;
  --err: #dc2626;
  --font-ui: "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, Helvetica, Arial, sans-serif;
  --font-mono: Consolas, "Courier New", Liberation Mono, monospace;
}

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

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

body {
  margin: 0;
  font-family: var(--font-ui);
  background-color: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

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

a {
  color: var(--cobalt);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  width: 100%;
  max-width: 1260px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Telemetry Top Bar */
.telemetry-bar {
  background-color: #060a12;
  color: #94a3b8;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 7px 0;
  border-bottom: 1px solid var(--border-dark);
}

.telemetry-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.telemetry-tag {
  color: #38bdf8;
  font-weight: 700;
}

/* Technical Header */
.lab-header {
  background-color: var(--bg-obsidian);
  color: var(--text-light);
  border-bottom: 2px solid var(--cobalt);
  position: sticky;
  top: 0;
  z-index: 100;
}

.lab-header-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;
  gap: 16px;
}

.lab-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none !important;
  color: #fff;
}

.lab-brand-mark {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--cobalt), var(--cyan));
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  color: #fff;
}

.lab-brand-name {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  display: block;
  line-height: 1.1;
}

.lab-brand-sub {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: #60a5fa;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lab-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: center;
}

.lab-nav a {
  color: #cbd5e1;
  font-size: 0.92rem;
  font-weight: 600;
  padding: 6px 8px;
  border-radius: 4px;
  text-decoration: none;
}

.lab-nav a:hover,
.lab-nav a.active {
  color: #fff;
  background-color: rgba(37, 99, 235, 0.25);
}

.lab-cart-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background-color: var(--cobalt);
  color: #fff !important;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  font-weight: 700;
  padding: 9px 16px;
  border-radius: 4px;
  text-decoration: none !important;
  border: 1px solid #60a5fa;
}

.lab-cart-btn:hover {
  background-color: var(--cobalt-dark);
}

.storage-warning {
  background-color: #fef3c7;
  color: #92400e;
  border-bottom: 1px solid #f59e0b;
  padding: 10px 20px;
  font-size: 0.88rem;
  text-align: center;
  display: none;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  font-size: 0.92rem;
  font-weight: 700;
  border-radius: 4px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none !important;
  transition: all 0.18s ease;
  font-family: var(--font-ui);
}

.btn-cobalt {
  background-color: var(--cobalt);
  color: #fff;
  border-color: var(--cobalt);
}

.btn-cobalt:hover {
  background-color: var(--cobalt-dark);
  color: #fff;
}

.btn-dark {
  background-color: var(--bg-obsidian);
  color: #fff;
  border-color: #334155;
}

.btn-dark:hover {
  background-color: var(--bg-slate);
  border-color: #60a5fa;
}

.btn-ghost {
  background-color: transparent;
  color: var(--text-primary);
  border-color: var(--border-grid);
}

.btn-ghost:hover {
  border-color: var(--cobalt);
  color: var(--cobalt);
}

.btn-sm {
  padding: 8px 14px;
  font-size: 0.84rem;
}

/* Hero Architecture - Full Dark Technical Console */
.hero-lab {
  background-color: var(--bg-obsidian);
  color: var(--text-light);
  border-bottom: 1px solid var(--border-dark);
  padding: 44px 0 0;
}

.hero-lab-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 32px;
  align-items: center;
  padding-bottom: 40px;
}

.mono-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: #38bdf8;
  background-color: rgba(14, 165, 233, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.35);
  padding: 4px 10px;
  border-radius: 3px;
  margin-bottom: 16px;
}

.hero-lab h1 {
  font-size: clamp(1.85rem, 3.2vw, 2.7rem);
  font-weight: 800;
  line-height: 1.18;
  margin: 0 0 16px;
  letter-spacing: -0.02em;
}

.hero-lab p {
  color: #94a3b8;
  font-size: 1.02rem;
  margin: 0 0 24px;
}

.hero-lab-visual {
  border: 1px solid #1e293b;
  border-radius: 6px;
  overflow: hidden;
  background-color: #070b14;
}

.telemetry-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid #1e293b;
  background-color: #080d18;
}

.telemetry-cell {
  padding: 18px 20px;
  border-right: 1px solid #1e293b;
}

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

.telemetry-cell strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: #60a5fa;
}

.telemetry-cell span {
  font-size: 0.82rem;
  color: #94a3b8;
}

/* Sections */
.section {
  padding: 56px 0;
}

.section-white {
  background-color: var(--bg-panel);
  border-top: 1px solid var(--border-grid);
  border-bottom: 1px solid var(--border-grid);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--text-primary);
}

.section-head h2 {
  font-size: clamp(1.45rem, 2.4vw, 2rem);
  margin: 4px 0 0;
  letter-spacing: -0.02em;
}

/* Chrono-Protocol Matrix (4 Windows) */
.protocol-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.protocol-box {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-grid);
  border-left: 4px solid var(--cobalt);
  padding: 22px;
  border-radius: 4px;
}

.protocol-time {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--cobalt);
  text-transform: uppercase;
  margin-bottom: 8px;
  display: block;
}

.protocol-box h3 {
  margin: 0 0 8px;
  font-size: 1.15rem;
}

/* Technical Product Spec Cards */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 22px;
}

.product-card {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-grid);
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.product-card:hover {
  border-color: var(--cobalt);
  box-shadow: 0 12px 24px rgba(15, 23, 42, 0.08);
}

.spec-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 16px;
  background-color: var(--bg-obsidian);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.76rem;
}

.spec-img-wrap {
  aspect-ratio: 1 / 1;
  background-color: #dfe5ec;
  overflow: hidden;
  border-bottom: 1px solid var(--border-grid);
}

.spec-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.spec-card-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.spec-role-tag {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--cobalt);
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.spec-title {
  margin: 0 0 6px;
  font-size: 1.24rem;
}

.spec-title a {
  color: var(--text-primary);
  font-weight: 800;
}

.spec-sub {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin: 0 0 12px;
}

.spec-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin: 0 0 14px;
  flex-grow: 1;
}

.spec-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--border-grid);
  background-color: var(--bg-page);
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  text-align: center;
}

.spec-metrics > div {
  padding: 8px 4px;
  border-right: 1px solid var(--border-grid);
}

.spec-metrics > div:last-child {
  border-right: none;
}

.spec-metrics strong {
  display: block;
  font-size: 0.86rem;
  color: var(--text-primary);
}

.spec-card-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 12px;
  border-top: 1px solid var(--border-grid);
}

.spec-price {
  font-family: var(--font-mono);
  font-size: 1.32rem;
  font-weight: 800;
  color: var(--text-primary);
}

/* Tables */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border-grid);
  background-color: var(--bg-panel);
  border-radius: 4px;
}

.tech-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
  font-size: 0.9rem;
}

.tech-table th,
.tech-table td {
  padding: 12px 15px;
  border-bottom: 1px solid var(--border-grid);
  text-align: left;
}

.tech-table th {
  background-color: var(--bg-obsidian);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
}

/* Split Layout */
.split-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
}

.panel-box {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-grid);
  border-radius: 4px;
  padding: 26px;
}

/* Filter Bar */
.filter-bar {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-grid);
  padding: 18px;
  border-radius: 4px;
  margin-bottom: 24px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr auto;
  gap: 12px;
  align-items: end;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.form-group label {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-primary);
}

.form-control {
  padding: 9px 12px;
  border: 1px solid var(--border-grid);
  border-radius: 4px;
  font-size: 0.94rem;
  font-family: var(--font-ui);
  width: 100%;
  background-color: #fff;
}

.qty-input-wrap {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--border-grid);
  border-radius: 4px;
  background-color: #fff;
}

.qty-btn {
  background: none;
  border: none;
  width: 36px;
  height: 40px;
  font-weight: 700;
  font-size: 1.1rem;
  cursor: pointer;
}

.qty-input {
  width: 52px;
  height: 40px;
  text-align: center;
  border: none;
  border-left: 1px solid var(--border-grid);
  border-right: 1px solid var(--border-grid);
  font-family: var(--font-mono);
  font-weight: 700;
}

/* Product Detail */
.detail-grid {
  display: grid;
  grid-template-columns: 0.92fr 1.08fr;
  gap: 32px;
  align-items: start;
  margin-bottom: 40px;
}

.thumb-row {
  display: flex;
  gap: 10px;
  margin-top: 12px;
}

.thumb-btn {
  width: 80px;
  height: 80px;
  padding: 0;
  border: 2px solid var(--border-grid);
  border-radius: 4px;
  overflow: hidden;
  cursor: pointer;
  background: none;
}

.thumb-btn.active {
  border-color: var(--cobalt);
}

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

/* Cart & Checkout */
.cart-layout {
  display: grid;
  grid-template-columns: 1.55fr 0.85fr;
  gap: 26px;
  align-items: start;
}

.cart-item-row {
  display: grid;
  grid-template-columns: 80px 1fr auto auto auto;
  gap: 14px;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid var(--border-grid);
}

.cart-item-img {
  width: 80px;
  height: 80px;
  object-fit: cover;
  border-radius: 4px;
  border: 1px solid var(--border-grid);
}

.summary-row {
  display: flex;
  justify-content: space-between;
  padding: 9px 0;
  border-bottom: 1px solid var(--border-grid);
  font-size: 0.94rem;
}

.summary-row.total {
  font-family: var(--font-mono);
  font-size: 1.28rem;
  font-weight: 800;
  color: var(--cobalt);
  border-bottom: none;
  padding-top: 14px;
}

.field-error {
  color: var(--err);
  font-size: 0.8rem;
  margin-top: 3px;
  display: none;
}

.local-preview-panel {
  background-color: var(--bg-panel);
  border: 2px solid var(--cobalt);
  border-radius: 4px;
  padding: 28px;
  display: none;
}

.preview-notice-banner {
  background-color: #eff6ff;
  border-left: 4px solid var(--cobalt);
  padding: 16px 18px;
  margin-bottom: 22px;
}

/* FAQ */
.faq-item {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-grid);
  border-radius: 4px;
  padding: 15px 20px;
  margin-bottom: 12px;
}

.faq-item summary {
  font-weight: 700;
  cursor: pointer;
}

/* Footer */
.lab-footer {
  background-color: var(--bg-obsidian);
  color: #cbd5e1;
  padding: 52px 0 28px;
  margin-top: 64px;
  border-top: 3px solid var(--cobalt);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1.2fr;
  gap: 28px;
  margin-bottom: 32px;
}

.lab-footer h4 {
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  text-transform: uppercase;
  margin: 0 0 14px;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 8px;
}

.footer-links a {
  color: #94a3b8;
  font-size: 0.9rem;
}

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

.cart-toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background-color: var(--bg-obsidian);
  color: #fff;
  border-left: 4px solid var(--cobalt);
  padding: 12px 18px;
  border-radius: 4px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.35);
  z-index: 999;
  display: none;
  font-size: 0.9rem;
}

@media (max-width: 992px) {
  .hero-lab-grid,
  .split-2,
  .detail-grid,
  .cart-layout,
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .telemetry-strip,
  .filter-bar {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .telemetry-strip,
  .filter-bar,
  .product-grid {
    grid-template-columns: 1fr;
  }
  .cart-item-row {
    grid-template-columns: 64px 1fr;
  }
}