/* ==========================================================================
   FLASHFOX // SWISS INTERNATIONAL TYPOGRAPHIC STYLE DESIGN SYSTEM
   Rules: Zero shadows, zero gradients, zero border-radius, strict 12-col grid.
   ========================================================================== */

:root {
  --bg-page: #ffffff;
  --bg-surface: #f6f6f6;
  --bg-dark: #000000;
  --ink-primary: #000000;
  --ink-secondary: #4a4a4a;
  --ink-muted: #767676;
  --ink-inverse: #ffffff;
  --swiss-red: #ff3b30;
  --border-hard: #000000;
  --border-soft: #d9d9d9;

  --font-sans: "Helvetica Neue", Helvetica, "Neue Haas Grotesk", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;

  --container-max: 1360px;
  --header-h: 64px;
  --baseline: 8px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  border-radius: 0 !important;
  box-shadow: none !important;
  background-image: none;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-page);
  color: var(--ink-primary);
  font-family: var(--font-sans);
  line-height: 1.5;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border-radius: 0;
}

img,
svg {
  display: block;
}

/* Tabular numeric alignment for millisecond precision */
.mono,
.tabular {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.text-red {
  color: var(--swiss-red);
}

.bg-red {
  background-color: var(--swiss-red);
  color: var(--ink-inverse);
}

/* ==========================================================================
   12-COLUMN SWISS GRID CONTAINER
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.swiss-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 0;
}

.col-12 { grid-column: span 12; }
.col-9  { grid-column: span 9; }
.col-8  { grid-column: span 8; }
.col-6  { grid-column: span 6; }
.col-4  { grid-column: span 4; }
.col-3  { grid-column: span 3; }

@media (max-width: 1024px) {
  .col-md-12 { grid-column: span 12; }
  .col-md-6  { grid-column: span 6; }
}

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
  .col-9,
  .col-8,
  .col-6,
  .col-4,
  .col-3 {
    grid-column: span 12;
  }
}

/* ==========================================================================
   HEADER / TOP NAVIGATION
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: var(--bg-page);
  border-bottom: 1px solid var(--border-hard);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: 1rem;
  white-space: nowrap;
}

.brand-square {
  width: 14px;
  height: 14px;
  background-color: var(--swiss-red);
  display: inline-block;
  flex-shrink: 0;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-muted);
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
  border-bottom-color: var(--swiss-red);
  color: var(--ink-primary);
}

.nav-links a.nav-kb-link {
  color: var(--swiss-red);
  font-weight: 700;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid var(--border-hard);
  background: var(--bg-page);
  color: var(--ink-primary);
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  white-space: nowrap;
}

.btn:hover {
  background: var(--bg-dark);
  color: var(--ink-inverse);
}

.btn-primary {
  background: var(--bg-dark);
  color: var(--ink-inverse);
  border-color: var(--border-hard);
}

.btn-primary:hover {
  background: var(--swiss-red);
  border-color: var(--swiss-red);
  color: var(--ink-inverse);
}

.btn-red {
  background: var(--swiss-red);
  color: var(--ink-inverse);
  border-color: var(--swiss-red);
}

.btn-red:hover {
  background: var(--bg-dark);
  border-color: var(--bg-dark);
  color: var(--ink-inverse);
}

.btn-sm {
  padding: 7px 14px;
  font-size: 0.78rem;
}

.btn-lg {
  padding: 15px 28px;
  font-size: 0.92rem;
}

.mobile-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-hard);
  padding: 6px 10px;
  font-size: 0.8rem;
  font-weight: 700;
}

@media (max-width: 1120px) {
  .nav-links {
    display: none;
  }
  .mobile-toggle {
    display: inline-flex;
  }
}

.mobile-drawer {
  display: none;
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  background: var(--bg-page);
  border-bottom: 1px solid var(--border-hard);
  z-index: 99;
  padding: 16px 24px 24px;
}

.mobile-drawer.open {
  display: block;
}

.mobile-drawer ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.mobile-drawer li {
  border-bottom: 1px solid var(--border-soft);
}

.mobile-drawer a {
  display: block;
  padding: 12px 0;
  font-weight: 600;
  font-size: 0.95rem;
}

/* ==========================================================================
   HERO WITH DYNAMIC KINETIC SWISS GRID CANVAS
   ========================================================================== */
.hero-section {
  position: relative;
  border-bottom: 1px solid var(--border-hard);
  overflow: hidden;
  background: var(--bg-page);
}

#swiss-kinetic-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
}

.hero-meta-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-soft);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  flex-wrap: wrap;
  gap: 8px;
}

.hero-status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--swiss-red);
  margin-right: 8px;
}

.hero-grid {
  padding: 56px 0 48px;
  align-items: end;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 20px;
  padding: 4px 10px;
  border: 1px solid var(--border-hard);
  background: var(--bg-page);
}

.hero-title {
  margin: 0 0 24px 0;
  font-size: clamp(2.5rem, 6vw, 5.2rem);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -0.04em;
}

.hero-manifesto {
  font-size: clamp(1.05rem, 1.8vw, 1.35rem);
  line-height: 1.65;
  color: var(--ink-primary);
  max-width: 660px;
  margin: 0 0 32px 0;
  font-weight: 400;
  background: rgba(255, 255, 255, 0.88);
  padding: 4px 0;
}

.hero-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-spec-panel {
  border: 1px solid var(--border-hard);
  background: rgba(255, 255, 255, 0.94);
}

.hero-spec-head {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-hard);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
  background: var(--bg-surface);
}

.hero-spec-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-soft);
}

.hero-spec-row:last-child {
  border-bottom: none;
}

.hero-spec-label {
  font-size: 0.82rem;
  color: var(--ink-secondary);
}

.hero-spec-value {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.hero-kpi-strip {
  border-top: 1px solid var(--border-hard);
  background: rgba(255, 255, 255, 0.95);
}

.kpi-cell {
  padding: 20px 24px;
  border-right: 1px solid var(--border-soft);
}

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

@media (max-width: 768px) {
  .kpi-cell {
    border-right: none;
    border-bottom: 1px solid var(--border-soft);
    padding: 16px;
  }
  .kpi-cell:last-child {
    border-bottom: none;
  }
}

.kpi-num {
  font-family: var(--font-mono);
  font-size: 1.85rem;
  font-weight: 700;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.kpi-desc {
  margin-top: 6px;
  font-size: 0.78rem;
  color: var(--ink-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ==========================================================================
   SECTION HEADER SYSTEM
   ========================================================================== */
.section-block {
  padding: 72px 0;
  border-bottom: 1px solid var(--border-hard);
}

.section-header {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  padding-bottom: 32px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--border-hard);
  align-items: end;
}

.section-index {
  grid-column: span 2;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--swiss-red);
  letter-spacing: 0.08em;
}

.section-title-wrap {
  grid-column: span 6;
}

.section-title {
  margin: 0;
  font-size: clamp(1.75rem, 3.2vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.12;
}

.section-lead {
  grid-column: span 4;
  margin: 0;
  font-size: 0.92rem;
  color: var(--ink-secondary);
  line-height: 1.6;
}

@media (max-width: 900px) {
  .section-index,
  .section-title-wrap,
  .section-lead {
    grid-column: span 12;
  }
  .section-index {
    margin-bottom: 8px;
  }
  .section-title-wrap {
    margin-bottom: 12px;
  }
}

/* ==========================================================================
   SECTION 03: NODE LATENCY & STATUS MATRIX (DESIGN YEARBOOK LAYOUT)
   ========================================================================== */
.telemetry-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}

.filter-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border: 1px solid var(--border-hard);
}

.filter-btn {
  border: none;
  border-right: 1px solid var(--border-hard);
  background: var(--bg-page);
  color: var(--ink-primary);
  padding: 8px 16px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.filter-btn:last-child {
  border-right: none;
}

.filter-btn.active {
  background: var(--bg-dark);
  color: var(--ink-inverse);
}

.telemetry-table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border-hard);
}

.swiss-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 780px;
}

.swiss-table th {
  background: var(--bg-surface);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-hard);
  border-right: 1px solid var(--border-soft);
}

.swiss-table td {
  padding: 14px 16px;
  font-size: 0.88rem;
  border-bottom: 1px solid var(--border-soft);
  border-right: 1px solid var(--border-soft);
  vertical-align: middle;
}

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

.swiss-table th:last-child,
.swiss-table td:last-child {
  border-right: none;
}

.swiss-table tbody tr:hover {
  background: var(--bg-surface);
}

.node-tag {
  display: inline-block;
  padding: 2px 8px;
  border: 1px solid var(--border-hard);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
}

.node-tag-red {
  border-color: var(--swiss-red);
  color: var(--swiss-red);
}

.latency-cell {
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  text-align: right;
  white-space: nowrap;
}

.load-bar-track {
  width: 90px;
  height: 6px;
  background: #e5e5e5;
  display: inline-block;
  vertical-align: middle;
  margin-right: 8px;
}

.load-bar-fill {
  height: 100%;
  background: var(--ink-primary);
}

.load-bar-fill.high {
  background: var(--swiss-red);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
}

.status-sq {
  width: 8px;
  height: 8px;
  background: var(--ink-primary);
}

.status-sq.online {
  background: var(--swiss-red);
}

/* ==========================================================================
   SECTION 04A: PRICING PLANS
   ========================================================================== */
.billing-switch-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}

.pricing-grid {
  border: 1px solid var(--border-hard);
}

.plan-card {
  padding: 28px 24px;
  border-right: 1px solid var(--border-hard);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: var(--bg-page);
}

.plan-card:last-child {
  border-right: none;
}

.plan-card.featured {
  background: var(--bg-surface);
  border-top: 4px solid var(--swiss-red);
}

@media (max-width: 1024px) {
  .plan-card {
    border-right: none;
    border-bottom: 1px solid var(--border-hard);
  }
  .plan-card:last-child {
    border-bottom: none;
  }
}

.plan-code {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--ink-muted);
  display: flex;
  justify-content: space-between;
  margin-bottom: 12px;
}

.plan-badge {
  color: var(--swiss-red);
  font-weight: 700;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 800;
  margin: 0 0 8px 0;
  letter-spacing: -0.02em;
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--ink-secondary);
  margin: 0 0 24px 0;
  min-height: 40px;
}

.plan-price-row {
  padding: 16px 0;
  border-top: 1px solid var(--border-soft);
  border-bottom: 1px solid var(--border-soft);
  margin-bottom: 20px;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.plan-price {
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}

.plan-unit {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-secondary);
}

.plan-specs {
  list-style: none;
  margin: 0 0 28px 0;
  padding: 0;
}

.plan-specs li {
  display: flex;
  justify-content: space-between;
  font-size: 0.84rem;
  padding: 8px 0;
  border-bottom: 1px solid var(--border-soft);
}

.plan-specs li span:last-child {
  font-family: var(--font-mono);
  font-weight: 700;
}

/* ==========================================================================
   SECTION 04B: CORE ADVANTAGES
   ========================================================================== */
.adv-grid {
  border-top: 1px solid var(--border-hard);
  border-left: 1px solid var(--border-hard);
}

.adv-card {
  padding: 32px 24px;
  border-right: 1px solid var(--border-hard);
  border-bottom: 1px solid var(--border-hard);
  background: var(--bg-page);
}

.adv-num {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--swiss-red);
  margin-bottom: 16px;
  display: block;
}

.adv-title {
  margin: 0 0 12px 0;
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.adv-text {
  margin: 0 0 16px 0;
  font-size: 0.9rem;
  color: var(--ink-secondary);
  line-height: 1.65;
}

.adv-metric {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  padding-top: 12px;
  border-top: 1px solid var(--border-soft);
  color: var(--ink-primary);
  font-weight: 700;
}

/* ==========================================================================
   SECTION 05: FAQ ACCORDION
   ========================================================================== */
.faq-list {
  border-top: 1px solid var(--border-hard);
}

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

.faq-trigger {
  width: 100%;
  background: none;
  border: none;
  padding: 22px 0;
  display: grid;
  grid-template-columns: 72px 1fr 32px;
  align-items: center;
  text-align: left;
  gap: 16px;
  color: var(--ink-primary);
}

.faq-code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--swiss-red);
}

.faq-q {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.faq-icon {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  text-align: right;
}

.faq-panel {
  display: none;
  padding: 0 32px 24px 88px;
  font-size: 0.92rem;
  color: var(--ink-secondary);
  line-height: 1.75;
  max-width: 880px;
}

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

@media (max-width: 768px) {
  .faq-trigger {
    grid-template-columns: 48px 1fr 24px;
    gap: 10px;
  }
  .faq-panel {
    padding: 0 0 20px 0;
  }
}

/* ==========================================================================
   SECTION 06: USER REVIEWS
   ========================================================================== */
.reviews-grid {
  border-top: 1px solid var(--border-hard);
  border-left: 1px solid var(--border-hard);
}

.review-card {
  padding: 28px 24px;
  border-right: 1px solid var(--border-hard);
  border-bottom: 1px solid var(--border-hard);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 20px;
}

.review-quote {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--ink-primary);
}

.review-meta {
  border-top: 1px solid var(--border-soft);
  padding-top: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
}

.review-author {
  font-weight: 700;
}

.review-role {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--ink-muted);
}

/* ==========================================================================
   CTA BANNER & FOOTER
   ========================================================================== */
.cta-band {
  background: var(--bg-dark);
  color: var(--ink-inverse);
  padding: 64px 0;
  border-bottom: 1px solid var(--border-hard);
}

.cta-band h2 {
  margin: 0 0 12px 0;
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.03em;
}

.cta-band p {
  margin: 0;
  color: #cccccc;
  max-width: 600px;
}

.site-footer {
  padding: 48px 0 36px;
  background: var(--bg-page);
}

.footer-grid {
  padding-bottom: 36px;
  border-bottom: 1px solid var(--border-soft);
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 14px 0;
  color: var(--ink-muted);
}

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

.footer-list li {
  margin-bottom: 8px;
  font-size: 0.86rem;
}

.footer-list a:hover {
  color: var(--swiss-red);
}

.footer-bottom {
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-muted);
}

/* ==========================================================================
   STANDALONE KNOWLEDGE BASE HUB & ARTICLE PAGES
   ========================================================================== */
.kb-hero {
  padding: 56px 0 40px;
  border-bottom: 1px solid var(--border-hard);
  background: var(--bg-surface);
}

.kb-breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--ink-secondary);
  margin-bottom: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.kb-breadcrumb a:hover {
  color: var(--swiss-red);
}

.kb-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 28px;
}

.kb-search {
  border: 1px solid var(--border-hard);
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  width: 280px;
  max-width: 100%;
  background: var(--bg-page);
}

.kb-search:focus {
  outline: 2px solid var(--swiss-red);
  outline-offset: -2px;
}

.kb-grid {
  border-top: 1px solid var(--border-hard);
  border-left: 1px solid var(--border-hard);
}

.kb-card {
  padding: 28px 24px;
  border-right: 1px solid var(--border-hard);
  border-bottom: 1px solid var(--border-hard);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 18px;
  background: var(--bg-page);
  transition: background-color 0.15s ease;
}

.kb-card:hover {
  background: var(--bg-surface);
}

.kb-card-top {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--ink-muted);
}

.kb-card-doc {
  color: var(--swiss-red);
  font-weight: 700;
}

.kb-card-title {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.02em;
}

.kb-card-excerpt {
  margin: 0;
  font-size: 0.88rem;
  color: var(--ink-secondary);
  line-height: 1.65;
}

.kw-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.kw-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 3px 8px;
  border: 1px solid var(--border-soft);
  background: var(--bg-page);
  color: var(--ink-secondary);
}

/* Article Detail Layout */
.article-header {
  padding: 48px 0 36px;
  border-bottom: 1px solid var(--border-hard);
}

.article-title {
  font-size: clamp(1.85rem, 3.8vw, 3rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin: 0 0 20px 0;
}

.article-meta-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--border-hard);
  margin-top: 24px;
}

.article-meta-cell {
  padding: 12px 16px;
  border-right: 1px solid var(--border-hard);
}

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

.article-meta-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--ink-muted);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.article-meta-val {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-weight: 700;
}

@media (max-width: 768px) {
  .article-meta-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .article-meta-cell {
    border-bottom: 1px solid var(--border-hard);
  }
}

.article-layout {
  padding: 48px 0 72px;
  border-bottom: 1px solid var(--border-hard);
}

.article-toc {
  padding-right: 32px;
}

.toc-box {
  position: sticky;
  top: 88px;
  border: 1px solid var(--border-hard);
  padding: 20px;
  background: var(--bg-surface);
}

.toc-title {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 14px 0;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-hard);
}

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

.toc-list li {
  margin-bottom: 10px;
  font-size: 0.84rem;
  line-height: 1.4;
}

.toc-list a:hover {
  color: var(--swiss-red);
}

.article-body {
  font-size: 1rem;
  line-height: 1.85;
  color: #111111;
}

.article-body h2 {
  font-size: 1.55rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 44px 0 16px 0;
  padding-top: 20px;
  border-top: 2px solid var(--border-hard);
}

.article-body h2:first-child {
  margin-top: 0;
}

.article-body h3 {
  font-size: 1.18rem;
  font-weight: 700;
  margin: 28px 0 12px 0;
}

.article-body p {
  margin: 0 0 18px 0;
}

.article-body ul,
.article-body ol {
  margin: 0 0 20px 0;
  padding-left: 22px;
}

.article-body li {
  margin-bottom: 8px;
}

.article-callout {
  border-left: 4px solid var(--swiss-red);
  background: var(--bg-surface);
  padding: 18px 22px;
  margin: 24px 0;
  font-size: 0.94rem;
}

.article-code {
  background: var(--bg-dark);
  color: #f4f4f4;
  padding: 18px 20px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
  overflow-x: auto;
  margin: 24px 0;
}

.article-table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border-hard);
  margin: 24px 0;
}

.article-nav-footer {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border: 1px solid var(--border-hard);
  margin-top: 48px;
}

.article-nav-link {
  padding: 20px 24px;
  display: block;
}

.article-nav-link:first-child {
  border-right: 1px solid var(--border-hard);
}

.article-nav-link:hover {
  background: var(--bg-surface);
}

@media (max-width: 768px) {
  .article-toc {
    padding-right: 0;
    margin-bottom: 32px;
  }
  .toc-box {
    position: static;
  }
  .article-nav-footer {
    grid-template-columns: 1fr;
  }
  .article-nav-link:first-child {
    border-right: none;
    border-bottom: 1px solid var(--border-hard);
  }
}