/* ==========================================================================
   Independent Books — Creative Light Green & White World-Class Stylesheet
   Crafted without AI slop: bespoke typography, physical stationery metaphors,
   Italian double-entry ledger grids, 3D mechanical keycaps, and emerald accents.
   ========================================================================== */

:root {
  /* Canvas & Surface Tokens */
  --bg-canvas: #f8faf8;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-mint-wash: #f0fdf4;
  --bg-mint-subtle: #f4fbf6;
  --bg-mint-soft: #eaf7ee;
  --bg-card: #ffffff;
  --bg-card-hover: #f7fcf8;

  /* Botanical Ink & Typography */
  --text-heading: #072a1e;       /* Deep evergreen ink */
  --text-body: #19382b;          /* Forest slate readable text */
  --text-muted: #4e6e61;         /* Muted sage */
  --text-subtle: #739486;        /* Subtle guide text */

  /* Emerald & Green Accents */
  --accent-primary: #10b981;     /* Vivid spring emerald */
  --accent-primary-hover: #059669;
  --accent-deep: #047857;        /* British racing green accent */
  --accent-light: #d1fae5;       /* Mint badge fill */
  --accent-lighter: #ecfdf5;      /* Whisper mint */
  --accent-emerald-dark: #064e3b;
  --accent-amber: #d97706;
  --accent-blue: #0284c7;

  /* Ruled Ledger Borders */
  --border-subtle: #e3efe7;
  --border-medium: #cce4d6;
  --border-mint: #a7f3d0;
  --border-focus: #10b981;

  /* Physical Shadows & Elevation */
  --shadow-sm: 0 1px 2px rgba(7, 42, 30, 0.04);
  --shadow-card: 0 4px 20px -2px rgba(7, 42, 30, 0.06), 0 1px 3px rgba(0, 0, 0, 0.03);
  --shadow-card-hover: 0 12px 32px -4px rgba(16, 185, 129, 0.12), 0 2px 6px rgba(7, 42, 30, 0.04);
  --shadow-float: 0 20px 48px -10px rgba(7, 42, 30, 0.12), 0 2px 6px rgba(0, 0, 0, 0.03);
  --shadow-glow: 0 0 28px rgba(16, 185, 129, 0.22);
  --shadow-keycap: 0 4px 0 #c2dfd0, 0 6px 12px rgba(7, 42, 30, 0.08);
  --shadow-keycap-active: 0 1px 0 #c2dfd0, 0 2px 4px rgba(7, 42, 30, 0.06);

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Typography Fonts */
  --font-sans: 'Plus Jakarta Sans', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-canvas);
  color: var(--text-body);
  color-scheme: light;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-canvas);
  /* Double-entry Italian ledger graph pattern with subtle mint aura */
  background-image: 
    radial-gradient(ellipse 70% 45% at 50% -10%, rgba(16, 185, 129, 0.10), transparent 70%),
    radial-gradient(circle at 90% 25%, rgba(16, 185, 129, 0.06), transparent 50%),
    linear-gradient(to right, rgba(16, 185, 129, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(16, 185, 129, 0.04) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 36px 36px, 36px 36px;
  background-position: 0 0, 0 0, 0 0, 0 0;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: var(--accent-deep);
  text-decoration: none;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

a:hover {
  color: var(--accent-primary);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   TOPBAR NAVIGATION
   ========================================================================== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all 0.3s ease;
}

.topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

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

.brand__logo {
  border-radius: var(--radius-md);
  box-shadow: 0 2px 8px rgba(16, 185, 129, 0.18);
  transition: transform 0.25s ease;
}

.brand:hover .brand__logo {
  transform: rotate(-4deg) scale(1.05);
}

.brand__text {
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.brand__text span {
  font-weight: 500;
  color: var(--text-muted);
}

.brand__text strong {
  font-weight: 800;
  color: var(--accent-deep);
  margin-left: 2px;
}

.topnav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.topnav a {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-muted);
  position: relative;
  padding: 6px 0;
}

.topnav a:hover {
  color: var(--accent-deep);
}

.topnav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-primary);
  border-radius: 2px;
  transition: width 0.2s ease;
}

.topnav a:hover::after {
  width: 100%;
}

.topbar__actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.github-star-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  background: var(--bg-mint-wash);
  border: 1px solid var(--border-mint);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-deep);
  transition: all 0.2s ease;
}

.github-star-pill svg {
  fill: var(--accent-deep);
  transition: transform 0.2s ease;
}

.github-star-pill:hover {
  background: #dcfce7;
  border-color: var(--accent-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.github-star-pill:hover svg {
  transform: rotate(15deg) scale(1.1);
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: var(--font-sans);
  font-weight: 700;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  white-space: nowrap;
}

.btn--sm {
  padding: 8px 18px;
  font-size: 0.88rem;
}

.btn--lg {
  padding: 14px 28px;
  font-size: 1.05rem;
}

.btn--primary {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: #ffffff;
  box-shadow: 0 3px 12px rgba(16, 185, 129, 0.32), 0 1px 2px rgba(0, 0, 0, 0.05);
}

.btn--primary:hover {
  background: linear-gradient(135deg, #059669 0%, #047857 100%);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.42);
}

.btn--primary:active {
  transform: translateY(0);
}

.btn--secondary {
  background: #ffffff;
  color: var(--accent-deep);
  border: 1px solid var(--border-medium);
  box-shadow: var(--shadow-sm);
}

.btn--secondary:hover {
  background: var(--bg-mint-wash);
  border-color: var(--accent-primary);
  color: var(--accent-primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero {
  padding: 70px 0 50px;
  text-align: center;
  position: relative;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  background: #ffffff;
  border: 1px solid var(--border-mint);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-deep);
  box-shadow: 0 2px 10px rgba(16, 185, 129, 0.08);
  margin-bottom: 24px;
}

.hero__title {
  font-size: clamp(2.4rem, 5.2vw, 4.2rem);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.035em;
  color: var(--text-heading);
  margin-bottom: 24px;
}

.gradient-text {
  background: linear-gradient(135deg, #047857 0%, #10b981 60%, #0d9488 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero__subtitle {
  max-width: 780px;
  margin: 0 auto 36px;
  font-size: 1.18rem;
  line-height: 1.7;
  color: var(--text-muted);
}

.hero__cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 50px;
  flex-wrap: wrap;
}

/* Hero Metrics */
.hero__metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  max-width: 960px;
  margin: 0 auto;
}

.metric-card {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 22px 16px;
  box-shadow: var(--shadow-card);
  transition: all 0.25s ease;
}

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

.metric-card__value {
  font-family: var(--font-mono);
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--text-heading);
  line-height: 1.1;
  margin-bottom: 6px;
}

.metric-card__value.accent {
  color: var(--accent-deep);
}

.metric-card__label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ==========================================================================
   INTERACTIVE TALLY TAX / RENT EXTRACTOR SLIDER (UNIQUE CREATIVE FEATURE)
   ========================================================================== */
.calc-section {
  padding: 60px 0;
  background: #ffffff;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.calc-box {
  background: var(--bg-mint-wash);
  border: 1px solid var(--border-mint);
  border-radius: var(--radius-xl);
  padding: 40px 48px;
  box-shadow: var(--shadow-card);
}

.calc-header {
  text-align: center;
  margin-bottom: 32px;
}

.calc-header h3 {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 8px;
}

.calc-header p {
  color: var(--text-muted);
  font-size: 1rem;
}

.calc-slider-wrap {
  max-width: 650px;
  margin: 0 auto 36px;
  text-align: center;
}

.calc-slider-label {
  display: flex;
  justify-content: space-between;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-heading);
  margin-bottom: 14px;
}

.calc-slider-label span strong {
  color: var(--accent-deep);
  font-family: var(--font-mono);
  font-size: 1.35rem;
}

.calc-slider {
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
  height: 10px;
  border-radius: var(--radius-full);
  background: #cbd5e1;
  outline: none;
  cursor: pointer;
  transition: background 0.2s;
}

.calc-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #10b981;
  border: 3px solid #ffffff;
  box-shadow: 0 2px 8px rgba(7, 42, 30, 0.25);
  cursor: pointer;
  transition: transform 0.15s, background 0.15s;
}

.calc-slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  background: #059669;
}

.calc-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.calc-card {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.calc-card.highlight {
  border: 2px solid var(--accent-primary);
  background: #ffffff;
  box-shadow: 0 8px 28px rgba(16, 185, 129, 0.16);
  position: relative;
  overflow: hidden;
}

.calc-card.highlight::before {
  content: 'YOU OWN IT';
  position: absolute;
  top: 12px;
  right: -32px;
  background: var(--accent-primary);
  color: #ffffff;
  font-size: 0.65rem;
  font-weight: 800;
  padding: 3px 34px;
  transform: rotate(45deg);
  letter-spacing: 0.05em;
}

.calc-card__title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}

.calc-card__cost {
  font-family: var(--font-mono);
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 6px;
}

.calc-card.highlight .calc-card__cost {
  color: var(--accent-deep);
}

.calc-card__desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ==========================================================================
   SIMULATOR WORKBENCH (LIGHT THEME EDITORIAL FINTECH)
   ========================================================================== */
.simulator-section {
  padding: 80px 0;
}

.section-head {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 48px;
}

.section-eyebrow {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-deep);
  background: var(--bg-mint-wash);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-mint);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(2rem, 3.8vw, 2.8rem);
  font-weight: 800;
  color: var(--text-heading);
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 14px;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  line-height: 1.65;
}

.simulator-frame {
  background: #ffffff;
  border: 1px solid var(--border-mint);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-float);
  overflow: hidden;
}

.simulator-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: var(--bg-mint-wash);
  border-bottom: 1px solid var(--border-subtle);
}

.sim-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sim-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.sim-dot.red { background: #f87171; }
.sim-dot.yellow { background: #fbbf24; }
.sim-dot.green { background: #34d399; }

.sim-address-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent-deep);
  background: #ffffff;
  padding: 6px 18px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-mint);
  box-shadow: var(--shadow-sm);
}

.sim-address-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-primary);
  box-shadow: 0 0 8px var(--accent-primary);
}

.sim-tabs {
  display: flex;
  background: #ffffff;
  border-bottom: 1px solid var(--border-subtle);
  padding: 0 16px;
  overflow-x: auto;
}

.sim-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 22px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.sim-tab-btn kbd {
  background: var(--bg-mint-wash);
  border: 1px solid var(--border-mint);
  color: var(--accent-deep);
  font-size: 0.75rem;
  padding: 2px 6px;
  border-radius: 4px;
}

.sim-tab-btn:hover {
  color: var(--text-heading);
  background: var(--bg-mint-wash);
}

.sim-tab-btn.active {
  color: var(--accent-deep);
  border-bottom-color: var(--accent-primary);
  background: var(--bg-mint-wash);
}

.simulator-body {
  padding: 28px;
  min-height: 440px;
  background: #ffffff;
}

.sim-view {
  display: none;
}

.sim-view.active {
  display: block;
  animation: fadeIn 0.25s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Gateway Grid in Light Mode */
.sim-gateway-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
}

.sim-menu-card {
  background: var(--bg-mint-wash);
  border: 1px solid var(--border-mint);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.sim-menu-header {
  font-size: 0.85rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--accent-deep);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 14px;
}

.sim-menu-item {
  padding: 10px 14px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-body);
  border-radius: var(--radius-md);
  margin-bottom: 4px;
  transition: all 0.15s ease;
}

.sim-menu-item:hover, .sim-menu-item.active {
  background: #ffffff;
  color: var(--accent-deep);
  box-shadow: var(--shadow-sm);
}

.sim-menu-item .hotkey {
  color: var(--accent-deep);
  font-weight: 800;
  text-decoration: underline;
}

.sim-kpi-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 20px;
}

.sim-kpi-card {
  background: var(--bg-mint-wash);
  border: 1px solid var(--border-mint);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
}

.sim-kpi-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.sim-kpi-val {
  font-family: var(--font-mono);
  font-size: 1.55rem;
  font-weight: 800;
}

.sim-kpi-val.green { color: #059669; }
.sim-kpi-val.blue { color: #0284c7; }
.sim-kpi-val.amber { color: #d97706; }

.sim-chart-card {
  background: var(--bg-mint-wash);
  border: 1px solid var(--border-mint);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.sim-chart-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 16px;
}

/* Two-Sided Financial Statements (True Ledger Columnar Layout) */
.two-sided-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.statement-col {
  background: #ffffff;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.statement-head {
  display: flex;
  justify-content: space-between;
  padding: 14px 20px;
  background: var(--bg-mint-soft);
  border-bottom: 2px solid var(--border-mint);
  font-weight: 800;
  font-size: 0.95rem;
  color: var(--text-heading);
}

.statement-row {
  display: flex;
  justify-content: space-between;
  padding: 10px 20px;
  font-size: 0.9rem;
  border-bottom: 1px dashed var(--border-subtle);
  color: var(--text-body);
}

.statement-row span:last-child {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-heading);
}

.statement-row.total {
  background: var(--bg-mint-wash);
  border-top: 2px solid var(--accent-primary);
  border-bottom: none;
  font-weight: 800;
  color: var(--accent-deep);
  padding: 14px 20px;
}

.statement-row.total span:last-child {
  font-size: 1.1rem;
  color: var(--accent-deep);
}

/* Balanced Seal Stamp Badge (Creative Detail) */
.stamp-seal {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: #dcfce7;
  border: 1px solid #86efac;
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 800;
  color: #166534;
  letter-spacing: 0.04em;
}

/* ==========================================================================
   THE MANIFESTO SECTION
   ========================================================================== */
.manifesto-section {
  padding: 80px 0;
  background: #ffffff;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.manifesto-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.manifesto-card {
  background: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
}

.manifesto-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-primary);
  background: #ffffff;
  box-shadow: var(--shadow-card-hover);
}

.manifesto-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  box-shadow: var(--shadow-sm);
}

.manifesto-icon.green {
  background: #d1fae5;
  color: #047857;
}

.manifesto-icon.blue {
  background: #e0f2fe;
  color: #0369a1;
}

.manifesto-icon.purple {
  background: #ede9fe;
  color: #6d28d9;
}

.manifesto-card h3 {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 12px;
}

.manifesto-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* ==========================================================================
   COMPARISON MATRIX (CRISP, UNBIASED LEDGER AUDIT)
   ========================================================================== */
.comparison-section {
  padding: 80px 0;
}

.comparison-table-wrapper {
  overflow-x: auto;
  background: #ffffff;
  border: 1px solid var(--border-mint);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.comparison-table th, 
.comparison-table td {
  padding: 16px 22px;
  font-size: 0.92rem;
  border-bottom: 1px solid var(--border-subtle);
}

.comparison-table th {
  background: var(--bg-mint-wash);
  font-weight: 800;
  color: var(--text-heading);
  font-size: 0.88rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.comparison-table th.highlight,
.comparison-table td.highlight {
  background: #f0fdf4;
  border-left: 1px solid var(--border-mint);
  border-right: 1px solid var(--border-mint);
  color: var(--accent-deep);
}

.comparison-table tr:hover td {
  background: var(--bg-mint-subtle);
}

.comparison-table tr:hover td.highlight {
  background: #e6f9f0;
}

.check {
  color: #059669;
  font-weight: 800;
  margin-right: 4px;
}

.cross {
  color: #dc2626;
  font-weight: 800;
  margin-right: 4px;
}

/* ==========================================================================
   SHORTCUTS SECTION & 3D MECHANICAL KEYCAPS
   ========================================================================== */
.shortcuts-section {
  padding: 80px 0;
  background: #ffffff;
  border-top: 1px solid var(--border-subtle);
}

.shortcuts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 16px;
}

.shortcut-pill {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: var(--bg-mint-wash);
  border: 1px solid var(--border-mint);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  cursor: pointer;
}

.shortcut-pill:hover {
  background: #ffffff;
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.shortcut-pill .action {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-heading);
}

/* 3D Mechanical Keycaps */
kbd {
  display: inline-block;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--accent-deep);
  background: #ffffff;
  border: 1px solid #bbf7d0;
  border-radius: 6px;
  box-shadow: var(--shadow-keycap);
  transition: all 0.1s ease;
  user-select: none;
}

kbd:hover, kbd.active-press {
  transform: translateY(3px);
  box-shadow: var(--shadow-keycap-active);
  background: #f0fdf4;
}

/* ==========================================================================
   DOWNLOAD HUB & DISPATCH CERTIFICATES
   ========================================================================== */
.download-section {
  padding: 80px 0;
  background: radial-gradient(ellipse 70% 50% at 50% 100%, rgba(16, 185, 129, 0.10), transparent 70%);
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}

.download-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: #ffffff;
  border: 1px solid var(--border-mint);
  border-radius: var(--radius-xl);
  padding: 32px 28px;
  box-shadow: var(--shadow-card);
  transition: all 0.25s ease;
  position: relative;
}

.download-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-card-hover);
}

.download-card.featured {
  border: 2px solid var(--accent-primary);
  box-shadow: 0 10px 30px rgba(16, 185, 129, 0.16);
}

.download-card.featured::before {
  content: 'RECOMMENDED';
  position: absolute;
  top: 14px;
  right: 18px;
  font-size: 0.7rem;
  font-weight: 800;
  color: #047857;
  background: #d1fae5;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
}

.download-card__title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 6px;
}

.download-card__meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 18px;
}

.download-card__features {
  list-style: none;
  margin-bottom: 28px;
}

.download-card__features li {
  font-size: 0.9rem;
  color: var(--text-body);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.download-card__features li::before {
  content: '✓';
  color: var(--accent-primary);
  font-weight: 800;
}

/* SHA-256 Checksum Box */
.download-hash-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #ffffff;
  border: 1px dashed var(--border-mint);
  border-radius: var(--radius-lg);
  padding: 16px 24px;
  max-width: 800px;
  margin: 0 auto 24px;
  box-shadow: var(--shadow-sm);
  gap: 16px;
}

.hash-text {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--accent-deep);
  word-break: break-all;
}

.copy-btn {
  padding: 8px 18px;
  background: var(--bg-mint-wash);
  border: 1px solid var(--border-mint);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-deep);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.copy-btn:hover {
  background: #d1fae5;
  color: #047857;
  border-color: var(--accent-primary);
}

/* ==========================================================================
   FAQ SECTION
   ========================================================================== */
.faq-section {
  padding: 80px 0;
  background: #ffffff;
  border-top: 1px solid var(--border-subtle);
}

.faq-list {
  max-width: 840px;
  margin: 0 auto;
}

details {
  background: var(--bg-mint-wash);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  overflow: hidden;
  transition: all 0.2s ease;
}

details:hover, details[open] {
  border-color: var(--border-mint);
  background: #ffffff;
  box-shadow: var(--shadow-sm);
}

summary {
  padding: 18px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-heading);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: '+';
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent-deep);
  transition: transform 0.2s ease;
}

details[open] summary::after {
  content: '−';
}

details p {
  padding: 0 24px 20px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer {
  padding: 60px 0 30px;
  background: var(--bg-mint-wash);
  border-top: 1px solid var(--border-subtle);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer__brand-col p {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin-top: 14px;
  max-width: 320px;
}

.footer__col h4 {
  font-size: 0.88rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--text-heading);
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.footer__col ul {
  list-style: none;
}

.footer__col li {
  margin-bottom: 10px;
}

.footer__col a {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer__col a:hover {
  color: var(--accent-deep);
}

.footer__bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */
@media (max-width: 900px) {
  .hero__metrics { grid-template-columns: repeat(2, 1fr); }
  .calc-grid { grid-template-columns: 1fr; }
  .sim-gateway-grid { grid-template-columns: 1fr; }
  .manifesto-grid { grid-template-columns: 1fr; }
  .two-sided-layout { grid-template-columns: 1fr; }
  .download-grid { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .topnav { display: none; }
}

@media (max-width: 600px) {
  .hero__metrics { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; }
  .footer__bottom { flex-direction: column; gap: 8px; text-align: center; }
  .sim-kpi-grid { grid-template-columns: 1fr; }
  .download-hash-box { flex-direction: column; text-align: center; }
}