/* =========================================================================
   Orbiture — main stylesheet
   Plain CSS, no build step. Design system per BRIEF.md:
   near-black navy, one cyan accent, hairline borders, system font stacks,
   monospace numerals, ~1100px content column, generous whitespace.
   ========================================================================= */

:root {
  /* Palette aligned to the Orbiture deck (ORBITURE_backup_main.html) */
  --bg: #00020f;
  --bg-alt: #030a1c;
  --bg-raised: #05102d;
  --text: #dce6f7;
  --text-dim: #8fa6c9;
  --text-faint: #5577aa;
  --accent: #3388ee;
  --accent-dim: #1d4d8a;
  --border: rgba(40, 110, 200, 0.28);
  --border-soft: rgba(40, 110, 200, 0.14);

  --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;

  --content-max: 1100px;
  --header-h: 72px;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, p, ul, ol, blockquote, figure {
  margin: 0;
}

ul {
  list-style: none;
  padding: 0;
}

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

img, svg {
  display: block;
  max-width: 100%;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

/* Anchors land below the sticky header */
section[id],
[id] {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -48px;
  left: 12px;
  z-index: 1000;
  background: var(--accent);
  color: var(--bg);
  padding: 10px 16px;
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.875rem;
  transition: top 0.2s var(--ease);
}

.skip-link:focus {
  top: 12px;
}

/* Focus visibility */
a:focus-visible,
button:focus-visible,
iframe:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- Layout helpers ---------- */
.content-col {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
  border-bottom: 1px solid var(--border-soft);
}

.section-alt {
  background: var(--bg-alt);
}

.section-kicker {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.section h2 {
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  max-width: 20ch;
  margin-bottom: 20px;
}

.section-lede {
  color: var(--text-dim);
  font-size: 1.05rem;
  max-width: 62ch;
  margin-bottom: 48px;
}

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: rgba(5, 8, 15, 0.82);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-soft);
}

.header-inner {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.brand-mark {
  color: var(--accent);
  display: flex;
}

/* problem-section comparison chart */
.cdm-chart { margin-top: 28px; padding: 24px 26px; }
.cdm-chart h3 { font-size: 1.05rem; margin-bottom: 2px; }
.cdm-chart .chart-sub { font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--text-faint); margin-bottom: 16px; }
.cdm-chart svg { width: 100%; max-width: 560px; height: auto; display: block; }
.cdm-chart .c-lab { fill: var(--text-dim); font-family: var(--font-mono); font-size: 13px; }
.cdm-chart .c-val { fill: var(--text); font-family: var(--font-mono); font-size: 13px; font-weight: 600; }
.cdm-chart .chart-note { color: var(--text-faint); font-size: 0.8rem; margin-top: 12px; }

/* the-sky-right-now section: histogram on top, live-view banner below it */
.sky-grid { display: grid; grid-template-columns: 1fr; gap: 20px; margin-top: 28px; max-width: 760px; }
.sky-profile { padding: 24px 26px; margin: 0; }
.sky-profile h3 { font-size: 1.05rem; margin-bottom: 14px; }
.sky-profile img { width: 100%; height: auto; display: block; }
.sky-profile figcaption { color: var(--text-faint); font-size: 0.8rem; margin-top: 12px; }
.sky-teaser { display: flex; flex-direction: row; align-items: center; gap: 24px;
  padding: 20px 28px; text-decoration: none; color: var(--text); }
.sky-teaser:hover { border-color: var(--accent); }
.sky-count { font-family: var(--font-mono); font-size: 2rem; font-weight: 600; color: var(--accent);
  font-variant-numeric: tabular-nums; letter-spacing: 0.02em; }
.sky-teaser-body { flex: 1; color: var(--text-dim); font-size: 0.92rem; line-height: 1.5; }
.sky-teaser .btn { white-space: nowrap; flex-shrink: 0; }
@media (max-width: 640px) {
  .sky-teaser { flex-direction: column; align-items: flex-start; gap: 12px; }
}

/* Letter-spaced wordmark: O R B I T U R E */
.brand-name {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.92rem;
  text-transform: uppercase;
  letter-spacing: 0.42em;
  margin-right: -0.42em; /* cancel the trailing letter-space */
}

.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  z-index: 110;
}

.hamburger,
.hamburger::before,
.hamburger::after {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text);
  transition: transform 0.25s var(--ease), opacity 0.2s var(--ease);
}

.hamburger {
  position: relative;
}

.hamburger::before,
.hamburger::after {
  content: "";
  position: absolute;
  left: 0;
}

.hamburger::before {
  top: -7px;
}

.hamburger::after {
  top: 7px;
}

.nav-toggle[aria-expanded="true"] .hamburger {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .hamburger::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .hamburger::after {
  top: 0;
  transform: rotate(-45deg);
}

.primary-nav ul {
  display: flex;
  align-items: center;
  gap: 32px;
}

.primary-nav a {
  font-size: 0.92rem;
  color: var(--text-dim);
  transition: color 0.15s var(--ease);
}

.primary-nav a:hover {
  color: var(--text);
}

.nav-cta {
  color: var(--accent) !important;
  border: 1px solid var(--accent-dim);
  padding: 8px 16px;
  border-radius: 4px;
}

.nav-cta:hover {
  background: rgba(51, 136, 238, 0.08);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 24px;
  border-radius: 4px;
  font-size: 0.95rem;
  font-weight: 600;
  border: 1px solid transparent;
  transition: background 0.15s var(--ease), border-color 0.15s var(--ease), transform 0.15s var(--ease);
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
}

.btn-primary:hover {
  background: #5aa2f5;
}

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

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

.btn-large {
  padding: 16px 32px;
  font-size: 1.05rem;
  font-family: var(--font-mono);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  border-bottom: 1px solid var(--border-soft);
}

.hero-visual {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-fallback {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 70% 20%, rgba(51, 136, 238, 0.10), transparent 55%),
    radial-gradient(ellipse at 20% 80%, rgba(51, 136, 238, 0.06), transparent 50%),
    linear-gradient(180deg, #00020f 0%, #020617 45%, #030a1c 100%);
}

.hero-iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  background: transparent;
  pointer-events: none;
  opacity: 0;
  transition: opacity 1.1s var(--ease);
}

.hero-iframe.is-loaded {
  opacity: 1;
}

.hero-content {
  position: relative;
  z-index: 1;
  padding-bottom: 112px;
  padding-top: 160px;
  width: 100%;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(2.2rem, 6vw, 4.2rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.08;
  max-width: 16ch;
  margin-bottom: 24px;
}

.hero-sub {
  color: var(--text-dim);
  font-size: clamp(1rem, 1.6vw, 1.2rem);
  max-width: 46ch;
  margin-bottom: 40px;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

/* ---------- Stat grid ---------- */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border-soft);
  border: 1px solid var(--border-soft);
}

.stat-card {
  background: var(--bg);
  padding: 32px 28px;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.stat-label {
  color: var(--text-dim);
  font-size: 0.92rem;
  max-width: 26ch;
}

/* ---------- Card grid ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.card {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 32px 28px;
  background: var(--bg-raised);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.card:hover {
  border-color: var(--accent-dim);
}

.card-icon {
  color: var(--accent);
  margin-bottom: 20px;
}

.card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.card p {
  color: var(--text-dim);
  font-size: 0.95rem;
}

/* ---------- Audiences ---------- */
.audience-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.audience-panel {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 40px 36px;
  background: var(--bg-raised);
}

.audience-panel h3 {
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.audience-panel p {
  color: var(--text-dim);
  margin-bottom: 24px;
}

.text-link {
  color: var(--accent);
  font-size: 0.92rem;
  font-weight: 600;
}

.text-link:hover {
  text-decoration: underline;
}

/* ---------- Fleet savings calculator ---------- */
.calculator-card {
  margin-top: 8px;
  margin-bottom: 40px;
  padding: 40px 36px;
}

.calc-intro {
  color: var(--text-dim);
  font-size: 0.95rem;
  margin-bottom: 32px;
  max-width: 60ch;
}

.calculator-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px 40px;
  margin-bottom: 8px;
}

.calc-control-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 2px;
}

.calc-control label,
.calc-control-head span {
  font-size: 0.92rem;
  color: var(--text);
}

.calc-readout {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.95rem;
  font-variant-numeric: tabular-nums;
}

.calc-hint {
  color: var(--text-faint);
  font-size: 0.78rem;
  margin-top: 6px;
  max-width: 40ch;
}

/* Range inputs — styled for both engines; native tracks are used as the
   fallback so the control is always usable even if a pseudo-element fails. */
.calc-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  margin: 14px 0 2px;
  background: var(--border);
  border-radius: 2px;
  outline: none;
}

.calc-slider::-webkit-slider-runnable-track {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
}

.calc-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  margin-top: -6px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 1px var(--accent-dim);
  cursor: pointer;
  transition: transform 0.15s var(--ease);
}

.calc-slider::-webkit-slider-thumb:hover {
  transform: scale(1.12);
}

.calc-slider::-moz-range-track {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
}

.calc-slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 1px var(--accent-dim);
  cursor: pointer;
}

.calc-slider:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.calc-toggle {
  display: flex;
  gap: 8px;
  margin-top: 10px;
}

.calc-toggle-btn {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-dim);
  font-size: 0.88rem;
  text-align: center;
  transition: border-color 0.15s var(--ease), color 0.15s var(--ease), background 0.15s var(--ease);
}

.calc-toggle-btn:hover {
  border-color: var(--accent-dim);
  color: var(--text);
}

.calc-toggle-btn.is-active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(51, 136, 238, 0.1);
}

.calc-outputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin: 36px 0 24px;
  padding-top: 32px;
  border-top: 1px solid var(--border-soft);
}

.calc-output-label {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-bottom: 8px;
}

.calc-output-value {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  font-weight: 500;
  color: var(--accent);
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
}

.calc-disclaimer {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-bottom: 8px;
}

.calc-sources {
  color: var(--text-faint);
  font-size: 0.8rem;
}

/* ---------- Trust ---------- */
.trust-quote {
  border-left: 2px solid var(--accent);
  padding: 4px 0 4px 24px;
  margin: 0 0 40px;
  max-width: 62ch;
}

.trust-quote p {
  font-size: 1.15rem;
  color: var(--text);
  font-style: normal;
}

.trust-points {
  display: grid;
  gap: 14px;
  max-width: 62ch;
}

.trust-points li {
  position: relative;
  padding-left: 24px;
  color: var(--text-dim);
  font-size: 0.98rem;
}

.trust-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

/* ---------- Flywheel ---------- */
.flywheel-diagram {
  max-width: 480px;
  margin: 0 auto;
}

.fw-node {
  fill: var(--bg-raised);
  stroke: var(--border);
  stroke-width: 1.4;
}

.fw-text {
  fill: var(--text);
  font-family: var(--font-sans);
  font-size: 11px;
}

/* ---------- Team ---------- */
.team-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.team-card {
  text-align: center;
  padding: 32px 20px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-raised);
}

.team-avatar {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, rgba(51, 136, 238, 0.35), rgba(51, 136, 238, 0.06) 70%);
  border: 1px solid var(--border);
}

.team-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.team-role {
  color: var(--text-dim);
  font-size: 0.88rem;
  font-family: var(--font-mono);
}

/* ---------- Contact ---------- */
.contact-section {
  border-bottom: none;
  text-align: left;
}

/* ---------- Footer ---------- */
.site-footer {
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 24px;
  color: var(--text-faint);
  font-size: 0.85rem;
}

.footer-legal {
  display: flex;
  gap: 20px;
}

.footer-legal a {
  color: var(--text-faint);
  transition: color 0.15s var(--ease);
}

.footer-legal a:hover,
.footer-legal a[aria-current="page"] {
  color: var(--text-dim);
}

/* ---------- Scroll reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .hero-iframe {
    transition: none;
  }

  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .card-grid {
    grid-template-columns: 1fr;
  }

  .audience-grid {
    grid-template-columns: 1fr;
  }

  .team-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }

  .stat-grid {
    grid-template-columns: 1fr;
  }

  .calc-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .calc-outputs {
    grid-template-columns: 1fr;
  }

  .calculator-card {
    padding: 32px 24px;
  }
}

@media (max-width: 700px) {
  .primary-nav {
    position: fixed;
    inset: var(--header-h) 0 0 0;
    background: var(--bg);
    transform: translateX(100%);
    transition: transform 0.3s var(--ease);
    overflow-y: auto;
    z-index: 90;
  }

  .primary-nav.is-open {
    transform: translateX(0);
  }

  .primary-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 24px;
  }

  .primary-nav li {
    width: 100%;
    border-bottom: 1px solid var(--border-soft);
  }

  .primary-nav a {
    display: block;
    padding: 18px 4px;
    font-size: 1.05rem;
  }

  .nav-cta {
    margin-top: 16px;
    display: inline-block;
    border-radius: 4px;
  }

  .nav-toggle {
    display: flex;
  }

  .team-grid {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 701px) {
  .nav-toggle {
    display: none;
  }
}

@media (max-width: 520px) {
  .section {
    padding: 64px 0;
  }

  .hero-content {
    padding-top: 120px;
    padding-bottom: 72px;
  }

  .hero-ctas {
    flex-direction: column;
    align-items: stretch;
  }
}