/* ============================================================================
 * TCO Audit (tcoaudit.com) — Institutional Telemetry & Cost-Engineering System
 * ============================================================================
 * AESTHETIC DIRECTION:
 * "Financial Research Monograph meets Cloud Telemetry Console."
 * Pairs editorial serif display authority (`Instrument Serif`) with precision
 * technical prose (`IBM Plex Sans`) and tabular numeric readouts (`IBM Plex Mono`).
 * ============================================================================ */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=IBM+Plex+Sans:wght@400;500;600;700&family=Instrument+Serif:ital@0;1&display=swap');

:root {
  --bg-obsidian: #090c10;
  --bg-panel: #10151c;
  --bg-elevated: #161d26;
  --bg-input: #0c1016;
  --ink-primary: #ece8df;
  --ink-secondary: #a2acb8;
  --ink-muted: #6c7785;
  --border-hairline: rgba(236, 232, 223, 0.11);
  --border-strong: rgba(236, 232, 223, 0.24);
  --emerald: #10b981;
  --emerald-dim: rgba(16, 185, 129, 0.14);
  --amber: #f59e0b;
  --amber-dim: rgba(245, 158, 11, 0.14);
  --crimson: #ef4444;
  --crimson-dim: rgba(239, 68, 68, 0.14);
  --cyan: #38bdf8;
  --font-display: 'Instrument Serif', Georgia, serif;
  --font-sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, monospace;
  --max-w: 1180px;
  --radius-sm: 4px;
  --radius-md: 8px;
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  background-image:
    radial-gradient(circle at 18% 0%, rgba(16, 185, 129, 0.07), transparent 42%),
    radial-gradient(circle at 88% 8%, rgba(245, 158, 11, 0.05), transparent 36%),
    linear-gradient(to right, rgba(236, 232, 223, 0.025) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(236, 232, 223, 0.025) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 48px 48px, 48px 48px;
}

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

/* Above-the-fold FTC Compliance Ledger Bar (Mandatory on every public page) */
.compliance-bar {
  background: #0d1218;
  border-bottom: 1px solid var(--border-hairline);
  font-size: 0.78rem;
  color: var(--ink-secondary);
  padding: 0.5rem 1.25rem;
}

.compliance-bar__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
}

.compliance-bar a {
  color: var(--ink-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Top Navigation */
.site-header {
  border-bottom: 1px solid var(--border-hairline);
  background: rgba(9, 12, 16, 0.86);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 40;
}

.site-header__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0.95rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand-mark {
  display: inline-flex;
  align-items: baseline;
  gap: 0.6rem;
}

.brand-mark__badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.18rem 0.45rem;
  border: 1px solid var(--emerald);
  color: var(--emerald);
  border-radius: var(--radius-sm);
}

.brand-mark__title {
  font-family: var(--font-display);
  font-size: 1.65rem;
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.35rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--ink-secondary);
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--ink-primary);
}

.nav-links a[aria-current="page"] {
  border-bottom: 2px solid var(--emerald);
  padding-bottom: 0.15rem;
}

/* Layout Containers */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.hero {
  padding: 4rem 0 2.75rem;
  border-bottom: 1px solid var(--border-hairline);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--emerald);
  display: inline-block;
  margin-bottom: 0.75rem;
}

h1 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2.5rem, 5vw, 4.1rem);
  line-height: 1.06;
  margin: 0 0 1.1rem;
  letter-spacing: -0.015em;
  max-width: 19ch;
}

h2 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.75rem, 3vw, 2.35rem);
  line-height: 1.15;
  margin: 0 0 0.75rem;
}

h3 {
  font-size: 1.08rem;
  font-weight: 600;
  margin: 0 0 0.45rem;
}

.lead {
  font-size: 1.1rem;
  color: var(--ink-secondary);
  max-width: 66ch;
  margin: 0 0 1.75rem;
}

/* Telemetry Strip */
.kpi-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  border: 1px solid var(--border-hairline);
  background: var(--bg-panel);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-top: 2rem;
}

.kpi-cell {
  padding: 1.15rem 1.3rem;
  border-right: 1px solid var(--border-hairline);
}

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

.kpi-cell__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
}

.kpi-cell__value {
  font-family: var(--font-mono);
  font-size: 1.55rem;
  font-weight: 600;
  margin-top: 0.25rem;
  font-variant-numeric: tabular-nums;
}

/* Tool & Card Grids */
.section {
  padding: 3.25rem 0;
  border-bottom: 1px solid var(--border-hairline);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(310px, 1fr));
  gap: 1.25rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.5rem;
}

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.panel--interactive:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.71rem;
  padding: 0.16rem 0.5rem;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem;
}

.tag--emerald {
  background: var(--emerald-dim);
  color: var(--emerald);
  border: 1px solid rgba(16, 185, 129, 0.32);
}

.tag--amber {
  background: var(--amber-dim);
  color: var(--amber);
  border: 1px solid rgba(245, 158, 11, 0.32);
}

.tag--crimson {
  background: var(--crimson-dim);
  color: var(--crimson);
  border: 1px solid rgba(239, 68, 68, 0.32);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.72rem 1.2rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.83rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.18s ease, border-color 0.18s ease, transform 0.12s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn--primary {
  background: var(--emerald);
  color: #04130d;
}

.btn--primary:hover {
  background: #34d399;
}

.btn--secondary {
  background: var(--bg-elevated);
  color: var(--ink-primary);
  border-color: var(--border-strong);
}

.btn--secondary:hover {
  border-color: var(--emerald);
}

/* Interactive Calculator Controls */
.calc-workspace {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 900px) {
  .calc-workspace {
    grid-template-columns: 1fr;
  }
}

.control-group {
  margin-bottom: 1.25rem;
}

.control-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.86rem;
  font-weight: 500;
  margin-bottom: 0.4rem;
}

.control-readout {
  font-family: var(--font-mono);
  color: var(--emerald);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--emerald);
  cursor: pointer;
}

input[type="text"],
input[type="url"],
input[type="number"],
select {
  width: 100%;
  background: var(--bg-input);
  color: var(--ink-primary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 0.68rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

input:focus,
select:focus,
.btn:focus-visible {
  outline: 2px solid var(--emerald);
  outline-offset: 2px;
}

/* Ledger Tables */
.ledger-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
}

.ledger-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  background: var(--bg-panel);
}

.ledger-table th,
.ledger-table td {
  padding: 0.85rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-hairline);
}

.ledger-table th {
  font-family: var(--font-mono);
  font-size: 0.73rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
  background: #0d1218;
}

.mono-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.text-emerald { color: var(--emerald); }
.text-amber { color: var(--amber); }
.text-crimson { color: var(--crimson); }
.text-muted { color: var(--ink-secondary); }

/* Entrance Choreography */
@keyframes riseIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.reveal {
  animation: riseIn 0.42s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}
.reveal--d1 { animation-delay: 0.06s; }
.reveal--d2 { animation-delay: 0.12s; }
.reveal--d3 { animation-delay: 0.18s; }

/* Footer */
.site-footer {
  padding: 2.5rem 0 3.5rem;
  color: var(--ink-muted);
  font-size: 0.83rem;
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
}

.site-footer a {
  color: var(--ink-secondary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media print {
  .site-header, .compliance-bar, .no-print {
    display: none !important;
  }
  html, body, .panel {
    background: #ffffff !important;
    color: #111111 !important;
  }
}