/* ==========================================================================
   AirTrafficTool — design system
   Editorial + instrument-panel. Warm paper, airspace ink, one signal colour.
   ========================================================================== */

@font-face {
  font-family: "Space Grotesk";
  src: url("/assets/fonts/space-grotesk-700.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Space Grotesk";
  src: url("/assets/fonts/space-grotesk-500.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Inter";
  src: url("/assets/fonts/inter-var.woff2") format("woff2");
  font-weight: 300 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("/assets/fonts/jetbrains-mono-500.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

:root {
  --ink: #0a1720;
  --ink-2: #0e2029;
  --ink-3: #17323f;
  --paper: #f6f2e9;
  --paper-2: #ede7da;
  --paper-3: #fffcf5;
  --line: #dcd3c1;
  --line-strong: #c9bea8;
  --text: #0d1b23;
  --muted: #56646b;
  --muted-2: #75828a;
  --amber: #f2a33c;
  --amber-bright: #ffc46b;
  --amber-soft: rgba(242, 163, 60, 0.14);
  --mint: #4ed19a;
  --red: #ef5f55;
  --sky: #7ac8f2;

  --font-display: "Space Grotesk", "Segoe UI", system-ui, sans-serif;
  --font-text: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;

  --wrap: 1180px;
  --gutter: 24px;
  --radius: 14px;
  --radius-lg: 20px;
  --shadow: 0 1px 2px rgba(13, 27, 35, 0.04), 0 12px 32px -20px rgba(13, 27, 35, 0.35);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font-family: var(--font-text);
  font-size: 17px;
  line-height: 1.65;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img,
svg,
video {
  display: block;
  max-width: 100%;
  height: auto;
}
button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}
a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  text-decoration-color: color-mix(in srgb, currentColor 38%, transparent);
}
a:hover {
  text-decoration-color: currentColor;
}
:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: 3px;
}
::selection {
  background: var(--amber);
  color: var(--ink);
}
h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.04;
  margin: 0;
  text-wrap: balance;
}
p {
  margin: 0;
  text-wrap: pretty;
}
ul,
ol {
  margin: 0;
  padding: 0;
}
hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 0;
}

/* ---------- primitives ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.skip-link {
  position: absolute;
  left: 50%;
  top: -100px;
  transform: translateX(-50%);
  z-index: 200;
  background: var(--amber);
  color: var(--ink);
  font: 500 13px/1 var(--font-mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 14px 18px;
  border-radius: 0 0 10px 10px;
  text-decoration: none;
  transition: top 0.2s var(--ease);
}
.skip-link:focus {
  top: 0;
}
.mono {
  font-family: var(--font-mono);
  font-size: 0.78em;
  letter-spacing: 0.06em;
}
.muted {
  color: var(--muted);
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}
.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 3px var(--amber-soft);
  flex: none;
}
.on-ink .eyebrow,
.section-ink .eyebrow,
.hero .eyebrow {
  color: rgba(246, 242, 233, 0.62);
}
.section {
  padding: clamp(56px, 7vw, 104px) 0;
  position: relative;
}
.section-tight {
  padding: clamp(40px, 5vw, 68px) 0;
}
.section-alt {
  background: var(--paper-2);
}
.section-ink {
  background: var(--ink);
  color: var(--paper);
}
.section-ink .muted,
.on-ink .muted {
  color: rgba(246, 242, 233, 0.62);
}
.rule {
  height: 1px;
  background: var(--line);
}
.section-head {
  max-width: 720px;
  display: grid;
  gap: 18px;
}
.section-head.center {
  margin: 0 auto;
  text-align: center;
  justify-items: center;
}
.section-title {
  font-size: clamp(1.9rem, 3.6vw, 2.9rem);
}
.section-lede {
  font-size: 1.06rem;
  color: var(--muted);
  max-width: 62ch;
}
.section-ink .section-lede,
.on-ink .section-lede {
  color: rgba(246, 242, 233, 0.7);
}
.section-head-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
  margin-bottom: clamp(28px, 4vw, 48px);
}
.lede {
  font-size: clamp(1.05rem, 1.6vw, 1.22rem);
  color: var(--muted);
  max-width: 60ch;
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}
.stack {
  display: grid;
  gap: 16px;
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 23, 32, 0.92);
  backdrop-filter: blur(14px) saturate(130%);
  -webkit-backdrop-filter: blur(14px) saturate(130%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.09);
  color: var(--paper);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 68px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--paper);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.06rem;
  letter-spacing: -0.02em;
  flex: none;
}
.brand-mark {
  width: 30px;
  height: 30px;
  flex: none;
}
.brand-name span {
  color: var(--amber);
}
.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}
.site-nav > a:not(.btn) {
  padding: 9px 12px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  color: rgba(246, 242, 233, 0.74);
  text-decoration: none;
  transition: color 0.16s var(--ease), background 0.16s var(--ease);
}
.site-nav > a:not(.btn):hover {
  color: var(--paper);
  background: rgba(255, 255, 255, 0.06);
}
body[data-nav="faa-smart"] .site-nav a[data-link="faa-smart"],
body[data-nav="airport-status"] .site-nav a[data-link="airport-status"],
body[data-nav="about"] .site-nav a[data-link="about"] {
  color: var(--amber);
}
.nav-cta {
  margin-left: 10px;
}
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  padding: 9px 12px;
  color: var(--paper);
  font: 500 11px/1 var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
}
.nav-toggle-bars {
  display: grid;
  gap: 4px;
  width: 16px;
}
.nav-toggle-bars i {
  display: block;
  height: 1.5px;
  background: currentColor;
  transition: transform 0.2s var(--ease);
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 22px;
  border-radius: 10px;
  border: 1px solid transparent;
  font-family: var(--font-text);
  font-size: 0.94rem;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.14s var(--ease), background 0.16s var(--ease), border-color 0.16s var(--ease),
    color 0.16s var(--ease), box-shadow 0.16s var(--ease);
}
.btn:active {
  transform: translateY(1px);
}
.btn-sm {
  padding: 10px 15px;
  font-size: 0.86rem;
  border-radius: 8px;
}
.btn-lg {
  padding: 18px 28px;
  font-size: 1rem;
}
.btn-amber {
  background: var(--amber);
  color: var(--ink);
  box-shadow: 0 8px 24px -12px rgba(242, 163, 60, 0.9);
}
.btn-amber:hover {
  background: var(--amber-bright);
}
.btn-ink {
  background: var(--ink);
  color: var(--paper);
}
.btn-ink:hover {
  background: var(--ink-3);
}
.btn-ghost {
  border-color: rgba(246, 242, 233, 0.24);
  color: var(--paper);
  background: transparent;
}
.btn-ghost:hover {
  border-color: rgba(246, 242, 233, 0.55);
  background: rgba(255, 255, 255, 0.06);
}
.btn-outline {
  border-color: var(--line-strong);
  color: var(--text);
  background: transparent;
}
.btn-outline:hover {
  border-color: var(--text);
  background: rgba(13, 27, 35, 0.04);
}
.btn[disabled] {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

/* ---------- hero ---------- */
.hero {
  position: relative;
  background:
    radial-gradient(1100px 620px at 82% -12%, rgba(242, 163, 60, 0.16), transparent 62%),
    radial-gradient(900px 520px at 4% 108%, rgba(122, 200, 242, 0.1), transparent 62%),
    var(--ink);
  color: var(--paper);
  overflow: hidden;
  isolation: isolate;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 96px 96px;
  -webkit-mask-image: radial-gradient(circle at 62% 32%, #000 0%, transparent 72%);
  mask-image: radial-gradient(circle at 62% 32%, #000 0%, transparent 72%);
  pointer-events: none;
  z-index: -1;
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  gap: clamp(32px, 5vw, 64px);
  align-items: start;
  padding-block: clamp(48px, 6vw, 84px) clamp(56px, 7vw, 96px);
}
.hero-copy {
  display: grid;
  gap: 24px;
  align-content: start;
  padding-top: 8px;
}
.hero-title {
  font-size: clamp(2.55rem, 5.4vw, 4.35rem);
  line-height: 0.98;
  letter-spacing: -0.038em;
}
.hero-title em {
  font-style: normal;
  color: var(--amber);
}
.hero-lede {
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  line-height: 1.6;
  color: rgba(246, 242, 233, 0.76);
  max-width: 46ch;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(246, 242, 233, 0.5);
}
.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.hero-meta span + span::before {
  content: "";
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: currentColor;
  margin-right: 2px;
}
.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 6px;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}
.hero-fact b {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.4vw, 1.8rem);
  letter-spacing: -0.02em;
  color: var(--paper);
  font-weight: 700;
  white-space: nowrap;
}
.hero-fact span {
  display: block;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(246, 242, 233, 0.5);
  line-height: 1.4;
}
.scope {
  position: absolute;
  right: -18%;
  top: -26%;
  width: min(940px, 82vw);
  aspect-ratio: 1;
  z-index: -1;
  opacity: 0.6;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(circle at 50% 50%, #000 30%, transparent 70%);
  mask-image: radial-gradient(circle at 50% 50%, #000 30%, transparent 70%);
}
.scope svg {
  width: 100%;
  height: 100%;
}
.scope-ring {
  fill: none;
  stroke: rgba(246, 242, 233, 0.16);
  stroke-width: 1;
}
.scope-ring--dash {
  stroke-dasharray: 2 9;
  stroke: rgba(246, 242, 233, 0.22);
}
.scope-sweep {
  transform-origin: 400px 400px;
  animation: sweep 14s linear infinite;
}
.scope-route {
  fill: none;
  stroke: rgba(122, 200, 242, 0.55);
  stroke-width: 1.5;
  stroke-dasharray: 5 7;
}
.scope-blip {
  fill: var(--amber);
}
.scope-blip--sky {
  fill: var(--sky);
}
.scope-blip-pulse {
  animation: blip 4.5s ease-in-out infinite;
}
@keyframes sweep {
  to {
    transform: rotate(360deg);
  }
}
@keyframes blip {
  0%,
  100% {
    opacity: 0.35;
  }
  50% {
    opacity: 1;
  }
}

/* ---------- calculator ---------- */
.calc {
  position: relative;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: linear-gradient(165deg, rgba(23, 50, 63, 0.94), rgba(12, 27, 36, 0.98));
  box-shadow: 0 30px 80px -40px rgba(0, 0, 0, 0.9), inset 0 1px 0 rgba(255, 255, 255, 0.07);
  padding: clamp(20px, 2.4vw, 28px);
  color: var(--paper);
  display: grid;
  gap: 20px;
  scroll-margin-top: 90px;
}
.calc-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}
.calc-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.18rem;
  letter-spacing: -0.02em;
}
.calc-sub {
  margin-top: 5px;
  font-size: 0.82rem;
  line-height: 1.5;
  color: rgba(246, 242, 233, 0.56);
  max-width: 34ch;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex: none;
  padding: 6px 9px;
  border-radius: 6px;
  border: 1px solid rgba(242, 163, 60, 0.4);
  background: rgba(242, 163, 60, 0.12);
  color: var(--amber-bright);
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  line-height: 1;
}
.badge-neutral {
  border-color: rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.06);
  color: rgba(246, 242, 233, 0.7);
}
.calc-fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.field {
  display: grid;
  gap: 6px;
}
.field > label {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(246, 242, 233, 0.55);
}
.field-control {
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 10px;
  padding: 0 12px;
  transition: border-color 0.15s var(--ease), background 0.15s var(--ease);
}
.field-control:focus-within {
  border-color: var(--amber);
  background: rgba(242, 163, 60, 0.07);
}
.field-control input {
  width: 100%;
  min-width: 0;
  padding: 11px 0;
  border: 0;
  background: transparent;
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 1rem;
  letter-spacing: -0.01em;
  outline: none;
  -moz-appearance: textfield;
  appearance: textfield;
}
.field-control input::-webkit-outer-spin-button,
.field-control input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.field-unit {
  flex: none;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(246, 242, 233, 0.42);
  padding-left: 8px;
}
.presets {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}
.preset {
  padding: 7px 10px;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: transparent;
  color: rgba(246, 242, 233, 0.72);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.15s var(--ease);
}
.preset:hover {
  border-color: rgba(246, 242, 233, 0.45);
  color: var(--paper);
}
.preset[aria-pressed="true"] {
  border-color: var(--amber);
  background: rgba(242, 163, 60, 0.16);
  color: var(--amber-bright);
}
.calc-out {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 18px;
  display: grid;
  gap: 14px;
}
.calc-out-label {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(246, 242, 233, 0.5);
}
.calc-big {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
}
.calc-big b {
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 3.6vw, 2.7rem);
  letter-spacing: -0.035em;
  line-height: 1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}
.calc-big span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(246, 242, 233, 0.5);
}
.calc-substats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}
.calc-substats div {
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 9px;
  padding: 9px 11px;
  background: rgba(255, 255, 255, 0.03);
}
.calc-substats b {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.02rem;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}
.calc-substats span {
  display: block;
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 8.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(246, 242, 233, 0.45);
}
.calc-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.calc-actions .btn {
  padding: 10px 14px;
  font-size: 0.82rem;
}
.calc-foot {
  font-size: 0.74rem;
  line-height: 1.55;
  color: rgba(246, 242, 233, 0.44);
}
.calc-foot a {
  color: rgba(246, 242, 233, 0.7);
}
.copy-note {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--mint);
  opacity: 0;
  transition: opacity 0.2s var(--ease);
}
.copy-note.is-on {
  opacity: 1;
}

/* ---------- cards & features ---------- */
.card {
  background: var(--paper-3);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(20px, 2.4vw, 30px);
  box-shadow: var(--shadow);
}
.card-quiet {
  background: transparent;
  box-shadow: none;
}
.card-ink {
  background: var(--ink);
  border-color: rgba(255, 255, 255, 0.1);
  color: var(--paper);
}
.card-kicker {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 14px;
}
.card h3 {
  font-size: 1.28rem;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}
.card p {
  color: var(--muted);
  font-size: 0.96rem;
  line-height: 1.62;
}
.card-ink p {
  color: rgba(246, 242, 233, 0.68);
}
.card-ink h3 {
  color: var(--paper);
}
.feature-icon {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: var(--amber-soft);
  color: #a45d00;
  margin-bottom: 18px;
  border: 1px solid rgba(242, 163, 60, 0.28);
}
.feature-icon svg {
  width: 20px;
  height: 20px;
}

/* ---------- stats ---------- */
.stat-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-3);
  overflow: hidden;
}
.stat {
  padding: 22px 20px;
  border-left: 1px solid var(--line);
  display: grid;
  gap: 6px;
  align-content: start;
}
.stat:first-child {
  border-left: 0;
}
.stat b {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 2.6vw, 2.1rem);
  letter-spacing: -0.03em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.stat span {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--muted);
  line-height: 1.45;
}
.stat small {
  font-size: 0.76rem;
  color: var(--muted-2);
  line-height: 1.45;
}

/* ---------- quote ---------- */
.quote {
  border-left: 2px solid var(--amber);
  padding: 4px 0 4px 24px;
  max-width: 70ch;
}
.quote p {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  line-height: 1.4;
  letter-spacing: -0.02em;
}
.quote cite {
  display: block;
  margin-top: 14px;
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.section-ink .quote cite {
  color: rgba(246, 242, 233, 0.55);
}

/* ---------- flow ---------- */
.flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  counter-reset: flow;
}
.flow-step {
  position: relative;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}
.flow-step::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px var(--paper);
}
.section-alt .flow-step::before {
  box-shadow: 0 0 0 4px var(--paper-2);
}
.flow-num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--muted-2);
}
.flow-step h3 {
  margin: 8px 0 8px;
  font-size: 1.06rem;
  line-height: 1.25;
  letter-spacing: -0.01em;
}
.flow-step p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.55;
}

/* ---------- timeline ---------- */
.timeline {
  list-style: none;
  display: grid;
  gap: 0;
  border-left: 1px solid var(--line-strong);
  margin-left: 6px;
}
.timeline li {
  position: relative;
  padding: 0 0 26px 28px;
}
.timeline li::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--line-strong);
}
.timeline li.is-now::before {
  background: var(--amber);
  border-color: var(--amber);
  box-shadow: 0 0 0 4px var(--amber-soft);
}
.timeline li:last-child {
  padding-bottom: 0;
}
.timeline-date {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted-2);
}
.timeline h3 {
  font-size: 1.05rem;
  margin: 6px 0 6px;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.timeline p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.55;
  max-width: 52ch;
}

/* ---------- table ---------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-3);
  -webkit-overflow-scrolling: touch;
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  min-width: 560px;
}
.data-table caption {
  text-align: left;
  padding: 16px 18px 0;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}
.data-table th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  background: rgba(13, 27, 35, 0.02);
  white-space: nowrap;
}
.data-table td {
  padding: 13px 18px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  line-height: 1.5;
}
.data-table tr:last-child td {
  border-bottom: 0;
}
.data-table td:first-child {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  white-space: nowrap;
}
.data-table tbody tr:hover {
  background: rgba(242, 163, 60, 0.06);
}

/* ---------- figure ---------- */
.figure {
  margin: 0;
  display: grid;
  gap: 12px;
}
.figure img {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--paper-3);
}
.figure figcaption {
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--muted);
  max-width: 72ch;
}
.figure figcaption b {
  color: var(--text);
  font-weight: 600;
}

/* ---------- faq ---------- */
.faq {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}
.faq details {
  border-bottom: 1px solid var(--line);
}
.faq summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding: 22px 4px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.02rem, 1.5vw, 1.16rem);
  letter-spacing: -0.015em;
  line-height: 1.35;
}
.faq summary::-webkit-details-marker {
  display: none;
}
.faq summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--amber);
  transition: transform 0.2s var(--ease);
  line-height: 1;
}
.faq details[open] summary::after {
  content: "\2013";
}
.faq summary:hover {
  color: #8a5200;
}
.faq-answer {
  padding: 0 4px 24px;
  max-width: 78ch;
  display: grid;
  gap: 12px;
  color: var(--muted);
  font-size: 0.97rem;
}
.faq-answer p {
  color: var(--muted);
}
.faq-answer a {
  color: var(--text);
}

/* ---------- callouts ---------- */
.note {
  display: grid;
  gap: 8px;
  padding: 16px 18px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(13, 27, 35, 0.03);
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--muted);
}
.note strong {
  color: var(--text);
}
.note-amber {
  border-color: rgba(242, 163, 60, 0.4);
  background: rgba(242, 163, 60, 0.08);
}
.note-amber strong {
  color: #7a4700;
}
.note-ink {
  background: var(--ink);
  border-color: rgba(255, 255, 255, 0.12);
  color: rgba(246, 242, 233, 0.7);
}
.note-ink strong {
  color: var(--paper);
}
.note-warn {
  border-color: rgba(239, 95, 85, 0.36);
  background: rgba(239, 95, 85, 0.07);
}
.note-warn strong {
  color: #9c2a22;
}

/* ---------- CTA panel ---------- */
.cta-panel {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--ink);
  color: var(--paper);
  padding: clamp(30px, 4.5vw, 56px);
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
  gap: 32px;
  align-items: center;
}
.cta-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(600px 300px at 90% 0%, rgba(242, 163, 60, 0.2), transparent 60%);
  pointer-events: none;
}
.cta-panel h2 {
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  position: relative;
}
.cta-panel p {
  margin-top: 14px;
  color: rgba(246, 242, 233, 0.7);
  max-width: 52ch;
  position: relative;
}
.cta-actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

/* ---------- sources ---------- */
.source-list {
  list-style: none;
  display: grid;
  gap: 12px;
  counter-reset: src;
}
.source-list li {
  counter-increment: src;
  position: relative;
  padding-left: 34px;
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--muted);
}
.source-list li::before {
  content: counter(src, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  color: var(--amber);
}
.source-list a {
  color: var(--text);
}

/* ---------- page hero (subpages) ---------- */
.page-hero {
  background:
    radial-gradient(800px 400px at 88% -20%, rgba(242, 163, 60, 0.13), transparent 65%),
    var(--ink);
  color: var(--paper);
  padding: clamp(44px, 6vw, 76px) 0 clamp(40px, 5vw, 60px);
  position: relative;
  overflow: hidden;
}
.page-hero .hero-title {
  font-size: clamp(2.2rem, 4.2vw, 3.4rem);
  max-width: 20ch;
}
.page-hero .hero-meta {
  margin-top: 22px;
}
.page-hero .hero-lede {
  margin-top: 20px;
}
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(246, 242, 233, 0.45);
  margin-bottom: 26px;
}
.breadcrumbs a {
  color: rgba(246, 242, 233, 0.7);
  text-decoration: none;
}
.breadcrumbs a:hover {
  color: var(--paper);
}
.breadcrumbs span {
  opacity: 0.5;
}

/* ---------- long-form article ---------- */
.article-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: clamp(32px, 4vw, 56px);
  align-items: start;
}
.prose {
  max-width: 72ch;
  display: grid;
  gap: 20px;
  font-size: 1.02rem;
  line-height: 1.72;
}
.prose > h2 {
  font-size: clamp(1.55rem, 2.6vw, 2rem);
  margin-top: 26px;
  scroll-margin-top: 92px;
}
.prose > h3 {
  font-size: 1.18rem;
  margin-top: 12px;
  letter-spacing: -0.01em;
  scroll-margin-top: 92px;
}
.prose p {
  color: #22333c;
}
.prose ul,
.prose ol {
  display: grid;
  gap: 10px;
  padding-left: 22px;
  color: #22333c;
}
.prose li::marker {
  color: var(--amber);
}
.prose a {
  color: #0a4d6b;
  text-decoration-color: rgba(10, 77, 107, 0.35);
}
.prose a:hover {
  text-decoration-color: currentColor;
}
.prose blockquote {
  margin: 0;
  border-left: 2px solid var(--amber);
  padding-left: 20px;
  font-family: var(--font-display);
  font-size: 1.16rem;
  line-height: 1.5;
  letter-spacing: -0.015em;
  color: var(--text);
}
.prose .note {
  font-size: 0.88rem;
}
.toc {
  position: sticky;
  top: 92px;
  border-left: 1px solid var(--line);
  padding-left: 20px;
  display: grid;
  gap: 10px;
}
.toc-title {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted-2);
  margin-bottom: 4px;
}
.toc a {
  font-size: 0.84rem;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
}
.toc a:hover,
.toc a.is-active {
  color: var(--text);
}
.toc a.is-active {
  color: #8a5200;
}

/* ---------- status tool ---------- */
.tool {
  display: grid;
  gap: 22px;
}
.tool-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: end;
}
.lookup {
  display: grid;
  gap: 8px;
}
.lookup label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}
.lookup-control {
  display: flex;
  align-items: center;
  background: var(--paper-3);
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  padding: 0 14px;
  transition: border-color 0.15s var(--ease), box-shadow 0.15s var(--ease);
}
.lookup-control:focus-within {
  border-color: var(--ink);
  box-shadow: 0 0 0 3px rgba(242, 163, 60, 0.22);
}
.lookup-control input {
  width: 100%;
  border: 0;
  background: transparent;
  padding: 16px 0;
  font-size: 1.02rem;
  outline: none;
}
.lookup-hint {
  font-size: 0.78rem;
  color: var(--muted-2);
  grid-column: 1 / -1;
}
.result {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-3);
  padding: clamp(18px, 2.6vw, 26px);
  min-height: 132px;
  display: grid;
  gap: 16px;
  align-content: start;
}
.result-empty {
  color: var(--muted);
  font-size: 0.94rem;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.result-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.result-airport {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}
.result-airport b {
  font-family: var(--font-display);
  font-size: 1.5rem;
  letter-spacing: -0.02em;
}
.result-airport span {
  font-size: 0.9rem;
  color: var(--muted);
}
.result-circuit {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}
.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--muted-2);
  display: inline-block;
}
.dot-live {
  background: var(--mint);
  box-shadow: 0 0 0 3px rgba(78, 209, 154, 0.18);
}
.dot-alert {
  background: var(--red);
  box-shadow: 0 0 0 3px rgba(239, 95, 85, 0.18);
}
.dot-stale {
  background: var(--amber);
  box-shadow: 0 0 0 3px var(--amber-soft);
}
.event {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
  display: grid;
  gap: 8px;
  background: var(--paper);
}
.event-head {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.chip {
  display: inline-flex;
  align-items: center;
  padding: 4px 8px;
  border-radius: 5px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: rgba(13, 27, 35, 0.07);
  color: #2b3d47;
  border: 1px solid rgba(13, 27, 35, 0.1);
}
.chip-closure {
  background: rgba(239, 95, 85, 0.12);
  color: #9c2a22;
  border-color: rgba(239, 95, 85, 0.3);
}
.chip-stop {
  background: rgba(239, 95, 85, 0.12);
  color: #9c2a22;
  border-color: rgba(239, 95, 85, 0.3);
}
.chip-delay {
  background: rgba(242, 163, 60, 0.16);
  color: #7a4700;
  border-color: rgba(242, 163, 60, 0.34);
}
.event dl {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 4px 14px;
  margin: 0;
  font-size: 0.86rem;
}
.event dt {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted-2);
  padding-top: 3px;
}
.event dd {
  margin: 0;
  color: #22333c;
}
.event-reason {
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--muted);
  word-break: break-word;
  background: rgba(13, 27, 35, 0.035);
  border-radius: 7px;
  padding: 9px 11px;
}
.result-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  align-items: center;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted-2);
}
.result-meta a {
  color: var(--muted);
}
.result-error {
  color: #9c2a22;
  font-size: 0.92rem;
  display: grid;
  gap: 8px;
}
.spinner {
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 2px solid rgba(13, 27, 35, 0.15);
  border-top-color: var(--amber);
  animation: spin 0.8s linear infinite;
  flex: none;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ---------- footer ---------- */
.site-footer {
  background: var(--ink);
  color: rgba(246, 242, 233, 0.68);
  padding: clamp(48px, 6vw, 76px) 0 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) repeat(3, minmax(0, 0.8fr));
  gap: 32px;
}
.footer-brand .brand {
  margin-bottom: 14px;
}
.footer-tag {
  font-size: 0.88rem;
  line-height: 1.6;
  max-width: 34ch;
  color: rgba(246, 242, 233, 0.55);
}
.footer-mail {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--amber);
  text-decoration: none;
}
.footer-col {
  display: grid;
  gap: 10px;
  align-content: start;
}
.footer-col h2 {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(246, 242, 233, 0.42);
  margin-bottom: 4px;
}
.footer-col a {
  font-size: 0.88rem;
  color: rgba(246, 242, 233, 0.72);
  text-decoration: none;
}
.footer-col a:hover {
  color: var(--paper);
}
.footer-disclaimer {
  margin-top: 44px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.09);
  font-size: 0.78rem;
  line-height: 1.65;
  color: rgba(246, 242, 233, 0.55);
  max-width: 92ch;
}
.footer-disclaimer strong {
  color: rgba(246, 242, 233, 0.8);
}
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  justify-content: space-between;
  align-items: center;
  margin-top: 22px;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(246, 242, 233, 0.5);
}
.footer-bottom p {
  margin: 0;
}

/* ---------- utilities ---------- */
.mt-0 { margin-top: 0; }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.mt-6 { margin-top: 24px; }
.mt-8 { margin-top: 32px; }
.mt-10 { margin-top: 40px; }
.mb-0 { margin-bottom: 0; }
.center { text-align: center; }
.hidden { display: none !important; }
.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;
}
.tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 7px;
  border-radius: 4px;
  background: rgba(13, 27, 35, 0.06);
  border: 1px solid rgba(13, 27, 35, 0.08);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}
.tag-amber {
  background: rgba(242, 163, 60, 0.14);
  border-color: rgba(242, 163, 60, 0.3);
  color: #7a4700;
}
.inline-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- 404 ---------- */
.notfound {
  min-height: 58vh;
  display: grid;
  place-content: center;
  gap: 18px;
  text-align: center;
  padding: 60px 0;
}
.notfound .code {
  font-family: var(--font-display);
  font-size: clamp(4rem, 12vw, 8rem);
  line-height: 0.9;
  letter-spacing: -0.05em;
  color: var(--line-strong);
}
.notfound p {
  color: var(--muted);
  max-width: 46ch;
  margin: 0 auto;
}
.notfound .btn {
  justify-self: center;
}

/* ---------- responsive ---------- */
@media (max-width: 1080px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 36px;
  }
  .hero-title {
    max-width: 22ch;
  }
  .scope {
    right: -30%;
    top: -30%;
    width: 780px;
    opacity: 0.4;
  }
  .article-grid {
    grid-template-columns: minmax(0, 1fr);
  }
  .toc {
    display: none;
  }
  .stat-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .stat:nth-child(3) {
    border-left: 0;
  }
  .stat:nth-child(n + 3) {
    border-top: 1px solid var(--line);
  }
  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .cta-panel {
    grid-template-columns: minmax(0, 1fr);
  }
  .cta-actions {
    justify-content: flex-start;
  }
  .footer-top {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 860px) {
  :root {
    --gutter: 20px;
  }
  body {
    font-size: 16px;
  }
  .nav-toggle {
    display: inline-flex;
  }
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--ink-2);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 12px 20px 20px;
    display: none;
    box-shadow: 0 24px 40px -30px rgba(0, 0, 0, 0.9);
  }
  .site-nav.is-open {
    display: flex;
  }
  .site-nav > a:not(.btn) {
    padding: 13px 8px;
    font-size: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  }
  .nav-cta {
    margin: 12px 0 0;
    width: 100%;
  }
  .header-inner {
    min-height: 62px;
  }
  .grid-3,
  .grid-2 {
    grid-template-columns: minmax(0, 1fr);
  }
  .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .flow-step {
    padding-top: 22px;
  }
  .hero-facts {
    gap: 12px;
  }
  .tool-form {
    grid-template-columns: minmax(0, 1fr);
  }
  .tool-form .btn {
    width: 100%;
  }
  .event dl {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px 0;
  }
  .event dt {
    padding-top: 8px;
  }
}

@media (max-width: 560px) {
  .calc-fields {
    grid-template-columns: minmax(0, 1fr);
  }
  .calc-substats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 7px;
  }
  .calc-substats b {
    font-size: 0.9rem;
  }
  .calc-substats span {
    font-size: 8px;
  }
  .hero-facts {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }
  .hero-fact {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 16px;
    padding-bottom: 10px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }
  .hero-fact span {
    margin: 0;
    text-align: right;
  }
  .stat-strip {
    grid-template-columns: minmax(0, 1fr);
  }
  .stat {
    border-left: 0;
    border-top: 1px solid var(--line);
  }
  .stat:first-child {
    border-top: 0;
  }
  .footer-top {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }
  .flow {
    grid-template-columns: minmax(0, 1fr);
  }
  .presets {
    gap: 6px;
  }
  .preset {
    font-size: 9px;
    padding: 6px 8px;
  }
  .cta-panel {
    padding: 26px 22px;
  }
}

/* ---------- motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .scope-sweep {
    animation: none;
  }
}

/* Reveal-on-scroll (progressive enhancement, no-JS safe) */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .js [data-reveal] {
    opacity: 1;
    transform: none;
  }
}

/* ---------- ARTCC grid (guide) ---------- */
.artcc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(118px, 1fr));
  gap: 8px;
}
.artcc {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--paper-3);
  padding: 11px 12px;
  display: grid;
  gap: 2px;
}
.artcc b {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  letter-spacing: 0.04em;
  color: var(--text);
}
.artcc span {
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.25;
}
.artcc small {
  font-family: var(--font-mono);
  font-size: 8.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted-2);
  margin-top: 2px;
}
.artcc-first {
  border-color: rgba(242, 163, 60, 0.55);
  background: rgba(242, 163, 60, 0.08);
}
.artcc-first small {
  color: #8a5200;
}

/* ---------- status page ---------- */
.status-card {
  padding: clamp(20px, 3vw, 32px);
  display: grid;
  gap: 18px;
}
.status-card .tool-form {
  gap: 12px;
}
.status-legal {
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--muted-2);
  border-top: 1px solid var(--line);
  padding-top: 14px;
}
.status-legal strong {
  color: var(--text);
}
.status-legal a {
  color: var(--muted);
}
.event-list {
  display: grid;
  gap: 12px;
}
.event-time {
  font-size: 10px;
  letter-spacing: 0.05em;
  color: var(--muted);
}
.event-reason-toggle {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  cursor: pointer;
  width: fit-content;
}
.event-reason-toggle:hover {
  color: var(--text);
}
.event details[open] .event-reason {
  margin-top: 8px;
}
.chooser {
  display: grid;
  gap: 8px;
}
.chooser-item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  width: 100%;
  text-align: left;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--paper);
  cursor: pointer;
  transition: border-color 0.15s var(--ease), background 0.15s var(--ease);
}
.chooser-item:hover {
  border-color: var(--ink);
  background: rgba(242, 163, 60, 0.08);
}
.chooser-item b {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
}
.chooser-item span {
  font-size: 0.86rem;
  color: var(--muted);
}
.result .note {
  font-size: 0.82rem;
}
.result-error .btn {
  justify-self: start;
  margin-top: 4px;
}
@media (max-width: 560px) {
  .artcc-grid {
    grid-template-columns: repeat(auto-fill, minmax(96px, 1fr));
  }
  .result-head {
    align-items: flex-start;
    flex-direction: column;
  }
}

/* ---------- layout utilities used by page content ---------- */
.text-xs { font-size: 11px; }
.text-sm { font-size: 0.95rem; }
.text-base { font-size: 1rem; }
.text-lg { font-size: 1.12rem; }
.text-amber { color: var(--amber-bright); }
.items-start { align-items: start; }
.center-items { justify-items: center; }
.prose-flush { max-width: none; }
.h3-sm { font-size: 1.15rem; line-height: 1.25; letter-spacing: -0.01em; }
.mb-7 { margin-bottom: 28px; }
.mb-8 { margin-bottom: 32px; }
.mt-3 { margin-top: 12px; }
.mt-5 { margin-top: 18px; }
.self-start { justify-self: start; }
.measure-70 { max-width: 70ch; }
.measure-78 { max-width: 78ch; }
.gap-lg { gap: clamp(24px, 4vw, 56px); }
.gap-xl { gap: clamp(24px, 4vw, 64px); }
.wrap-narrow { max-width: 920px; }
.wrap-legal { max-width: 760px; }
.tracking { letter-spacing: 0.06em; }