/* ============================================================================
   Multiplex - design system
   "Refined transit-map": light, airy, editorial wayfinding. Rooted in authentic
   U.S. highway-signage language (guide-sign green, route shields, milepost
   numerals) but rendered on clean paper rather than a dark control room.

   Light is the default theme. Dark ("asphalt") is available via the toggle.
   Single brand accent = signage green. Blue / red / amber appear only as
   semantic shield + status tokens, never as decorative accents.
   ========================================================================== */

/* ----- Fonts (Overpass derives from FHWA Highway Gothic; Inter for UI) ------ */
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Overpass+Mono:wght@500;600&family=Overpass:wght@300;400;500;600;700;800&display=swap");

/* ----- Tokens: LIGHT (default) -------------------------------------------- */
:root {
  color-scheme: light;

  /* Surfaces - warm paper family, no pure white shadows */
  --bg: #fbfbf8;
  --bg-grid: #f1f1ec;
  --surface: #ffffff;
  --surface-2: #f6f7f4;
  --surface-3: #edefe9;
  --line: #e4e7e1;
  --line-strong: #cbd0c7;

  /* Ink - one warm-gray family */
  --text: #14171c;
  --text-muted: #545b66;
  --text-subtle: #828a95;

  /* Brand accent - FHWA guide-sign green (the one accent for the whole site) */
  --green: #006a4e;
  --green-bright: #008b67;
  --green-deep: #004d39;
  --green-ink: #e0f2f1;

  /* Semantic shield + status tokens (not decorative) */
  --shield-blue: #0b3b8c;
  --shield-blue-bright: #1e64c8;
  --shield-red: #c8102e;
  --shield-red-deep: #8f231d;
  --amber: #b7791f;
  --amber-soft: #c99700;

  /* Soft, low tinted shadows for the light theme */
  --shadow-sm: 0 1px 2px rgba(20, 30, 50, 0.06);
  --shadow: 0 14px 36px rgba(20, 36, 60, 0.10);
  --shadow-green: 0 12px 30px rgba(0, 106, 78, 0.16);

  /* Radius scale (containers soft, controls medium, shields custom) */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;
  --r-pill: 999px;

  /* Type */
  --font-display: "Overpass", "Segoe UI", system-ui, sans-serif;
  --font-body: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-mono: "Overpass Mono", ui-monospace, "Cascadia Code", monospace;

  --max: 1200px;
  --max-wide: 1400px;
  --nav-h: 68px;

  /* z-index scale */
  --z-grain: 5;
  --z-sticky: 40;
  --z-nav: 50;
  --z-overlay: 80;
}

/* ----- Tokens: DARK (toggle / "asphalt") ---------------------------------- */
:root[data-theme="dark"] {
  color-scheme: dark;

  --bg: #0b0f17;
  --bg-grid: #0d1220;
  --surface: #121826;
  --surface-2: #18202f;
  --surface-3: #1e2839;
  --line: #232d3e;
  --line-strong: #36435a;

  --text: #e9eef6;
  --text-muted: #9aabc0;
  --text-subtle: #6a7a91;

  --green: #1f9d57;
  --green-bright: #34c074;
  --green-deep: #0c3f25;
  --green-ink: #d7f5e4;

  --shield-blue-bright: #4f8df0;
  --amber: #d99a2b;
  --amber-soft: #e8b860;

  --shadow-sm: 0 2px 8px rgba(4, 8, 16, 0.5);
  --shadow: 0 18px 48px rgba(4, 9, 20, 0.55);
  --shadow-green: 0 14px 40px rgba(31, 157, 87, 0.18);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  background-color: var(--bg);
  /* faint signage grid over warm paper, with a soft green wash up top */
  background-image:
    linear-gradient(rgba(120, 134, 156, 0.10) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 134, 156, 0.10) 1px, transparent 1px),
    radial-gradient(circle at 80% -10%, rgba(0, 106, 78, 0.06), transparent 45%);
  background-size: 64px 64px, 64px 64px, 100% 720px;
  background-attachment: fixed, fixed, scroll;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* very light paper grain (kept subtle so the page stays airy) */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: var(--z-grain);
  pointer-events: none;
  opacity: 0.02;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* dark theme: swap to the asphalt grid + a touch more grain */
:root[data-theme="dark"] body {
  background-image:
    linear-gradient(rgba(54, 67, 90, 0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(54, 67, 90, 0.16) 1px, transparent 1px),
    radial-gradient(circle at 80% -10%, rgba(31, 157, 87, 0.10), transparent 45%);
}

:root[data-theme="dark"] body::after { opacity: 0.035; }

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

button,
input,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
}

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

::selection {
  background: var(--green);
  color: #fff;
}

:focus-visible {
  outline: 2px solid var(--green-bright);
  outline-offset: 2px;
  border-radius: 3px;
}

/* ----- Typography --------------------------------------------------------- */
h1,
h2,
h3,
h4 {
  margin: 0 0 0.5em;
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -0.02em;
  text-wrap: balance;
  color: var(--text);
}

h1 {
  font-size: clamp(2.6rem, 6vw, 5rem);
  font-weight: 800;
}

h2 {
  font-size: clamp(1.9rem, 3.6vw, 3rem);
}

h3 {
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}

p {
  margin: 0 0 1em;
  color: var(--text-muted);
  max-width: 66ch;
  text-wrap: pretty;
}

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

.accent { color: var(--green-bright); }

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--green-bright);
}

.kicker::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--green);
}

.lead {
  font-size: 1.18rem;
  color: var(--text-muted);
  max-width: 60ch;
}

/* ----- Layout ------------------------------------------------------------- */
.wrap {
  width: min(var(--max), calc(100% - 40px));
  margin-inline: auto;
}

.wrap-wide {
  width: min(var(--max-wide), calc(100% - 40px));
  margin-inline: auto;
}

.section {
  padding-block: clamp(56px, 9vw, 104px);
}

.section-tight {
  padding-block: clamp(40px, 6vw, 68px);
}

.divider {
  height: 1px;
  border: 0;
  margin: 0;
  background: linear-gradient(90deg, transparent, var(--line-strong) 18%, var(--line-strong) 82%, transparent);
}

/* dashed lane-divider rule */
.lane-rule {
  height: 4px;
  border: 0;
  margin: 0;
  background: repeating-linear-gradient(90deg, var(--amber) 0 26px, transparent 26px 52px);
  opacity: 0.5;
  border-radius: 2px;
}

/* ----- Skip link ---------------------------------------------------------- */
.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: var(--z-overlay);
  padding: 10px 16px;
  background: var(--green);
  color: #fff;
  border-radius: var(--r-sm);
  font-weight: 600;
  transition: top 0.2s ease;
}

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

/* ----- Header / nav ------------------------------------------------------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--line);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  height: var(--nav-h);
  width: min(var(--max-wide), calc(100% - 40px));
  margin-inline: auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
  color: var(--text);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(4px, 1.6vw, 18px);
}

.nav-link,
.nav-links a {
  position: relative;
  padding: 8px 4px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.18s ease;
  white-space: nowrap;
}

.nav-link:hover,
.nav-links a:hover {
  color: var(--text);
}

.nav-link.is-active,
.nav-links a.is-active {
  color: var(--text);
}

.nav-link.is-active::after,
.nav-links a.is-active::after {
  content: "";
  position: absolute;
  left: 4px;
  right: 4px;
  bottom: -1px;
  height: 2px;
  background: var(--green);
  border-radius: 2px;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-sm);
  background: var(--surface);
}

.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  position: relative;
  transition: transform 0.2s ease;
}

.nav-toggle span::before { position: absolute; top: -6px; }
.nav-toggle span::after { position: absolute; top: 6px; }

.topbar-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  flex: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-sm);
  background: var(--surface-2);
  color: var(--text-muted);
  transition: color 0.16s ease, border-color 0.16s ease;
}

.theme-toggle:hover {
  color: var(--text);
  border-color: var(--green);
}

/* Show the current mode's icon: sun in light (default), moon in dark. */
.theme-toggle .i-moon { display: none; }
.theme-toggle .i-sun { display: inline-flex; }
:root[data-theme="dark"] .theme-toggle .i-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .i-moon { display: inline-flex; }

/* ----- Buttons ------------------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 22px;
  border-radius: var(--r-md);
  border: 1px solid transparent;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.92rem;
  letter-spacing: 0.01em;
  white-space: nowrap;
  transition: transform 0.15s ease, background 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.btn:active {
  transform: translateY(1px) scale(0.99);
}

.btn-primary {
  background: var(--green);
  color: #fff;
  box-shadow: var(--shadow-green);
}

.btn-primary:hover {
  background: var(--green-bright);
}

.btn-secondary {
  background: var(--surface-2);
  color: var(--text);
  border-color: var(--line-strong);
}

.btn-secondary:hover {
  border-color: var(--green);
  background: var(--surface-3);
}

.btn-ghost {
  min-height: auto;
  padding: 4px 0;
  background: none;
  color: var(--green-bright);
  font-family: var(--font-body);
  font-weight: 600;
  border-bottom: 1px solid transparent;
  border-radius: 0;
}

.btn-ghost:hover {
  border-bottom-color: var(--green-bright);
}

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

/* ----- Shields ------------------------------------------------------------ */
/* Authentic U.S. Interstate shield drawn as an SVG background: white outline,
   red top band, blue body. One shared image reused by every shield on the site;
   the route number is overlaid as text so no per-shield markup is needed.
   Light theme keeps a soft drop-shadow instead of the dark "headlight" glow. */
.shield {
  position: relative;
  display: inline-block;
  width: 58px;
  height: 64px;
  flex: none;
  color: #fff;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.03em;
  filter: drop-shadow(0 2px 4px rgba(20, 36, 60, 0.18));
  background: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 110'><defs><clipPath id='s'><path d='M28 5C18 5 10 6 8 14C7 22 7 30 8 40C9 64 16 84 50 106C84 84 91 64 92 40C93 30 93 22 92 14C90 6 82 5 72 5C62 5 58 11 50 11C42 11 38 5 28 5Z'/></clipPath></defs><g clip-path='url(%23s)'><rect width='100' height='110' fill='%230b3b8c'/><rect width='100' height='32' fill='%23c8102e'/></g><path d='M28 5C18 5 10 6 8 14C7 22 7 30 8 40C9 64 16 84 50 106C84 84 91 64 92 40C93 30 93 22 92 14C90 6 82 5 72 5C62 5 58 11 50 11C42 11 38 5 28 5Z' fill='none' stroke='%23ffffff' stroke-width='7' stroke-linejoin='round'/></svg>") center / contain no-repeat;
}

.shield-num {
  position: absolute;
  left: 7%;
  right: 7%;
  top: 60%;
  transform: translateY(-50%);
  text-align: center;
  font-size: 1.02rem;
  line-height: 1;
}

.shield-sm {
  width: 38px;
  height: 42px;
}

.shield-sm .shield-num {
  font-size: 0.6rem;
}

.shield-lg {
  width: 100px;
  height: 110px;
  /* Large variant carries the "INTERSTATE" wordmark in the red band. */
  background-image: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 110'><defs><clipPath id='s'><path d='M28 5C18 5 10 6 8 14C7 22 7 30 8 40C9 64 16 84 50 106C84 84 91 64 92 40C93 30 93 22 92 14C90 6 82 5 72 5C62 5 58 11 50 11C42 11 38 5 28 5Z'/></clipPath></defs><g clip-path='url(%23s)'><rect width='100' height='110' fill='%230b3b8c'/><rect width='100' height='32' fill='%23c8102e'/></g><path d='M28 5C18 5 10 6 8 14C7 22 7 30 8 40C9 64 16 84 50 106C84 84 91 64 92 40C93 30 93 22 92 14C90 6 82 5 72 5C62 5 58 11 50 11C42 11 38 5 28 5Z' fill='none' stroke='%23ffffff' stroke-width='7' stroke-linejoin='round'/><text x='50' y='24' text-anchor='middle' font-family='Arial,Helvetica,sans-serif' font-size='12' font-weight='700' fill='%23ffffff'>INTERSTATE</text></svg>");
}

.shield-lg .shield-num {
  font-size: 1.7rem;
  top: 64%;
}

/* Unsigned routes (Alaska, Puerto Rico): a ghost shield, since these federal
   Interstates are not posted with the standard red/white/blue shield. Light
   theme uses a paper ghost; dark theme swaps to a slate ghost. */
.shield-unsigned {
  filter: none;
  background-image: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 110'><path d='M28 5C18 5 10 6 8 14C7 22 7 30 8 40C9 64 16 84 50 106C84 84 91 64 92 40C93 30 93 22 92 14C90 6 82 5 72 5C62 5 58 11 50 11C42 11 38 5 28 5Z' fill='%23f1f1ec' stroke='%23828a95' stroke-width='4' stroke-dasharray='7 5' stroke-linejoin='round'/></svg>") !important;
}

:root[data-theme="dark"] .shield-unsigned {
  background-image: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 110'><path d='M28 5C18 5 10 6 8 14C7 22 7 30 8 40C9 64 16 84 50 106C84 84 91 64 92 40C93 30 93 22 92 14C90 6 82 5 72 5C62 5 58 11 50 11C42 11 38 5 28 5Z' fill='%2318202f' stroke='%236a7a91' stroke-width='4' stroke-dasharray='7 5' stroke-linejoin='round'/></svg>") !important;
}

.shield-unsigned .shield-num {
  color: var(--text-subtle);
}

/* ----- Guide-sign panel (green road-sign card) ---------------------------- */
.sign {
  position: relative;
  padding: 26px 26px 24px;
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, var(--green) 0%, var(--green-deep) 100%);
  color: #fff;
  box-shadow: var(--shadow);
  isolation: isolate;
}

.sign::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 2px solid rgba(255, 255, 255, 0.85);
  border-radius: 10px;
  pointer-events: none;
}

.sign h3,
.sign h2 {
  color: #fff;
}

.sign p {
  color: rgba(255, 255, 255, 0.88);
  margin-bottom: 0;
}

/* ----- Generic cards & surfaces ------------------------------------------ */
.card {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.card-link:hover {
  border-color: var(--line-strong);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.card h3 {
  color: var(--text);
}

.card p {
  margin-bottom: 0;
  font-size: 0.96rem;
}

.eyebrow-num {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--green-bright);
  display: block;
  margin-bottom: 14px;
}

/* ----- Chips & status ----------------------------------------------------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 11px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-strong);
  background: var(--surface-2);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
  white-space: nowrap;
}

.status {
  display: inline-flex;
  align-items: center;
  padding: 5px 12px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
  background: var(--surface-2);
}

.status-active {
  color: var(--green);
  border-color: rgba(0, 106, 78, 0.4);
  background: rgba(0, 106, 78, 0.10);
}

.status-program,
.status-notable {
  color: var(--shield-blue);
  border-color: rgba(11, 59, 140, 0.35);
  background: rgba(11, 59, 140, 0.08);
}

.status-possible {
  color: var(--amber);
  border-color: rgba(183, 121, 31, 0.42);
  background: rgba(183, 121, 31, 0.12);
}

.status-theoretical,
.status-unassigned {
  color: var(--text-subtle);
  border-color: var(--line);
  background: var(--surface-2);
}

:root[data-theme="dark"] .status-active {
  color: #6fe3a0;
  border-color: rgba(31, 157, 87, 0.45);
  background: rgba(31, 157, 87, 0.12);
}

:root[data-theme="dark"] .status-program,
:root[data-theme="dark"] .status-notable {
  color: var(--shield-blue-bright);
  border-color: rgba(47, 111, 214, 0.42);
  background: rgba(47, 111, 214, 0.10);
}

:root[data-theme="dark"] .status-possible {
  color: var(--amber-soft);
  border-color: rgba(217, 154, 43, 0.42);
  background: rgba(217, 154, 43, 0.12);
}

/* ----- Hero --------------------------------------------------------------- */
.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
  min-height: calc(100dvh - var(--nav-h));
  padding-block: clamp(40px, 6vw, 80px);
}

.hero-copy {
  max-width: 36rem;
}

.hero h1 {
  margin-bottom: 18px;
}

.hero h1 .accent {
  color: var(--green-bright);
}

.hero .lead {
  margin-bottom: 28px;
}

/* search field */
.field {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 12px;
  min-height: 56px;
  padding: 0 16px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.field:focus-within {
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(0, 106, 78, 0.12);
}

.field label {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--green-bright);
}

.field input {
  width: 100%;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  font-size: 1rem;
}

.field input::placeholder {
  color: var(--text-subtle);
}

.hero-search {
  margin-bottom: 22px;
  max-width: 460px;
}

/* ----- Home system board (real-data hero panel) --------------------------- */
.board {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.board-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--line);
  background: var(--surface-2);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-subtle);
}

.board-head .mono {
  color: var(--green-bright);
}

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

.board-list li {
  border-bottom: 1px solid var(--line);
}

.board-list a {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 14px 20px;
  transition: background 0.15s ease;
}

.board-list a:hover {
  background: var(--surface-2);
}

.board-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.board-name {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--text);
}

.board-sub {
  font-size: 0.84rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.board-stat {
  font-size: 0.86rem;
  color: var(--green-bright);
  white-space: nowrap;
}

.board-foot {
  display: block;
  padding: 14px 20px;
  background: var(--surface-2);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  transition: color 0.15s ease;
}

.board-foot:hover {
  color: var(--green-bright);
}

/* ----- Route detail prose helpers ----------------------------------------- */
.route-aka {
  font-size: 1rem;
  color: var(--text-muted);
}

.route-termini {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--green);
  border-radius: var(--r-md);
  background: var(--surface);
  color: var(--text);
  font-size: 0.96rem;
}

.route-termini .k {
  font-size: 0.66rem;
  color: var(--text-subtle);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ----- Metric / milepost strip ------------------------------------------- */
.metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.metric {
  padding: 26px 24px;
  border-right: 1px solid var(--line);
}

.metric:last-child {
  border-right: 0;
}

.metric-value {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2rem, 3.4vw, 2.9rem);
  font-weight: 600;
  line-height: 1;
  color: var(--text);
  margin-bottom: 10px;
}

.metric-value .unit {
  font-size: 0.9rem;
  color: var(--green-bright);
  margin-left: 4px;
}

.metric-label {
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.35;
}

/* ----- Section heading ---------------------------------------------------- */
.section-head {
  max-width: 64ch;
  margin-bottom: 40px;
}

.section-head p {
  margin-bottom: 0;
}

/* ----- Feature grids ------------------------------------------------------ */
.grid {
  display: grid;
  gap: 18px;
}

.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* bento for the home explore grid */
.bento {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 18px;
}

.bento > * { min-width: 0; }
.col-2 { grid-column: span 2; }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-6 { grid-column: span 6; }

/* featured route card */
.route-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  height: 100%;
}

.route-card-head {
  display: flex;
  align-items: center;
  gap: 14px;
}

.route-card-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.route-card-meta .name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--text);
}

.route-card-meta .sub {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--text-subtle);
  text-transform: uppercase;
}

.route-card .stat {
  margin-top: auto;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--green-bright);
  font-size: 0.86rem;
}

/* ----- Database browser --------------------------------------------------- */
.browser {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 380px);
  gap: 22px;
  align-items: start;
}

.browser-main {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  min-width: 0;
}

.toolbar {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto;
  gap: 16px;
  align-items: center;
  padding: 18px;
  border-bottom: 1px solid var(--line);
}

.toolbar .field {
  min-height: 48px;
  box-shadow: none;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.filter {
  min-height: 38px;
  padding: 0 13px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-sm);
  background: var(--surface-2);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  transition: background 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.filter:hover {
  color: var(--text);
  border-color: var(--line-strong);
}

.filter.is-active {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
}

.result-meta {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-subtle);
}

.route-list {
  max-height: 740px;
  overflow: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}

.route-row {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  width: 100%;
  padding: 16px 18px;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: none;
  color: inherit;
  text-align: left;
  transition: background 0.14s ease;
}

.route-row:hover,
.route-row.is-selected {
  background: var(--surface-2);
}

.route-row.is-selected {
  box-shadow: inset 3px 0 0 var(--green);
}

.route-row .kick {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-subtle);
}

.route-row .name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
  margin-bottom: 3px;
}

.route-row .desc {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.4;
  color: var(--text-muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* detail side panel (database) */
.detail-panel {
  position: sticky;
  top: calc(var(--nav-h) + 18px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  padding: 24px;
  min-height: 480px;
}

.detail-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.detail-top .title {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0;
}

.data-list {
  display: grid;
  gap: 0;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.data-list li {
  display: grid;
  grid-template-columns: 104px minmax(0, 1fr);
  gap: 14px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  font-size: 0.92rem;
  color: var(--text);
}

.data-list .k {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-subtle);
  padding-top: 2px;
}

.data-list .v .mono {
  color: var(--text);
}

.empty {
  padding: 48px 24px;
  text-align: center;
  color: var(--text-subtle);
}

/* sort control (in the result meta row) */
.sort-control {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-transform: none;
  letter-spacing: 0;
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--text-subtle);
}

.sort-control select {
  border: 1px solid var(--line-strong);
  background: var(--surface-2);
  color: var(--text);
  border-radius: var(--r-sm);
  padding: 6px 10px;
  font-size: 0.82rem;
}

/* compare tray + table */
.compare-bar {
  position: sticky;
  bottom: 16px;
  margin-top: 18px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
  z-index: var(--z-sticky);
}

.cmp-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 16px;
  padding: 14px 18px;
}

.cmp-count { color: var(--green-bright); font-size: 0.82rem; }
.cmp-chips { display: flex; flex-wrap: wrap; gap: 8px; flex: 1; }

.cmp-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  background: var(--surface-2);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.cmp-chip:hover { border-color: var(--shield-red); color: var(--shield-red); }
.cmp-actions { display: flex; align-items: center; gap: 12px; }
.cmp-actions .btn { min-height: 40px; }
.cmp-actions .btn[disabled] { opacity: 0.5; cursor: not-allowed; }

.cmp-table-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.cmp-table { width: 100%; border-collapse: collapse; font-size: 0.86rem; }
.cmp-table th,
.cmp-table td { padding: 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.cmp-table thead th { text-align: center; }
.cmp-table thead th span { display: block; font-family: var(--font-mono); font-size: 0.74rem; margin-top: 4px; color: var(--text-muted); }
.cmp-table thead th .shield { margin: 0 auto; }
.cmp-table tbody th {
  color: var(--text-subtle);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
  white-space: nowrap;
}

/* ----- State mileage logs (route detail tables) --------------------------- */
.mileage-table {
  width: 100%;
  margin-top: 24px;
  border-collapse: separate;
  border-spacing: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.mileage-table th {
  background: var(--surface-2);
  text-align: left;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-subtle);
  border-bottom: 1px solid var(--line);
}

.mileage-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  font-size: 0.95rem;
  color: var(--text);
}

.mileage-table tr:last-child td {
  border-bottom: 0;
}

.mileage-table .state-col {
  font-weight: 700;
  color: var(--text);
  width: 120px;
}

.mileage-table .miles-col {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--green-bright);
  text-align: right;
  width: 100px;
}

/* ----- Decoder ------------------------------------------------------------ */
.decoder {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(300px, 0.85fr);
  gap: clamp(28px, 5vw, 60px);
  align-items: start;
}

.decoder-form {
  display: grid;
  gap: 14px;
}

.decoder-form .field {
  min-height: 60px;
}

.decoder-out {
  min-height: 168px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.decoder-out h3 {
  margin-bottom: 8px;
}

.decoder-out p {
  margin-bottom: 0;
  font-size: 0.96rem;
}

.decoder-examples {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.decoder-examples button {
  padding: 7px 13px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  background: var(--surface-2);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  transition: border-color 0.16s ease, color 0.16s ease;
}

.decoder-examples button:hover {
  border-color: var(--green);
  color: var(--text);
}

/* ----- Route detail page -------------------------------------------------- */
.route-hero {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(20px, 4vw, 40px);
  align-items: center;
  padding-block: clamp(36px, 5vw, 56px);
}

.route-hero .meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.route-hero h1 {
  margin: 6px 0 4px;
}

.route-statgrid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.route-statgrid .cell {
  padding: 22px 20px;
  background: var(--surface);
}

.route-statgrid .cell .k {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-subtle);
  margin-bottom: 10px;
}

.route-statgrid .cell .v {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
}

.route-statgrid .cell .v small {
  font-size: 0.82rem;
  color: var(--green-bright);
}

.route-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
  gap: clamp(28px, 5vw, 56px);
  align-items: start;
}

.chip-set {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.fact-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.fact-list li {
  position: relative;
  padding-left: 26px;
  color: var(--text-muted);
}

.fact-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 12px;
  height: 12px;
  background: var(--green);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

.junction-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.junction-links a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 12px 6px 7px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  background: var(--surface-2);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text);
  transition: border-color 0.16s ease, background 0.16s ease;
}

.junction-links a:hover {
  border-color: var(--green);
  background: var(--surface-3);
}

.prevnext {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 8px;
}

.prevnext a {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 16px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--surface);
  flex: 1;
  transition: border-color 0.16s ease;
}

.prevnext a:hover { border-color: var(--green); }
.prevnext .dir {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-subtle);
}
.prevnext .to-name { font-weight: 600; color: var(--text); }
.prevnext .next { text-align: right; }

/* ----- Prose (history, guide, faq, glossary, sources) --------------------- */
.prose {
  max-width: 70ch;
}

.prose h2 {
  margin-top: 1.6em;
}

.prose h3 {
  margin-top: 1.4em;
  color: var(--text);
}

.prose p,
.prose li {
  color: var(--text-muted);
}

.prose ul {
  padding-left: 1.1em;
}

.prose li {
  margin-bottom: 0.5em;
}

.prose a {
  color: var(--green-bright);
  border-bottom: 1px solid rgba(0, 139, 103, 0.4);
}

.prose a:hover {
  border-bottom-color: var(--green-bright);
}

.prose strong {
  color: var(--text);
}

/* timeline (history) */
.timeline {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.timeline li {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 22px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.timeline .year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--green-bright);
}

.timeline h3 {
  margin-bottom: 6px;
}

.timeline p {
  margin-bottom: 0;
  font-size: 0.96rem;
}

/* faq */
.faq-item {
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.faq-item h3 {
  margin-bottom: 8px;
}

.faq-item p {
  margin-bottom: 0;
}

/* glossary */
.glossary {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.glossary div {
  display: grid;
  grid-template-columns: minmax(140px, 220px) minmax(0, 1fr);
  gap: 24px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.glossary dt {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--text);
}

.glossary dd {
  margin: 0;
  color: var(--text-muted);
}

/* ----- Guide diagrams ----------------------------------------------------- */
.diagram {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  padding: 24px;
}

.diagram svg { width: 100%; height: auto; }

/* ----- Map page ----------------------------------------------------------- */
.map-stage {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background:
    radial-gradient(circle at 60% 20%, rgba(11, 59, 140, 0.06), transparent 45%),
    var(--surface);
  box-shadow: var(--shadow-sm);
  padding: 18px;
  overflow: hidden;
}

.map-stage svg { width: 100%; height: auto; }

/* Real US states map (choropleth). Per-state fills are injected per page. */
.usmap { width: 100%; height: auto; display: block; }
.usmap path { fill: #e7ebe4; stroke: #ffffff; stroke-width: 1; transition: fill 0.15s ease; outline: none; }
.usmap line { display: none; }
.usmap [tabindex]:focus-visible { outline: 2px solid var(--green-bright); }

:root[data-theme="dark"] .usmap path { fill: #161c28; stroke: #0b0f17; }

.state-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  flex: none;
  border-radius: var(--r-sm);
  background: var(--surface-3);
  color: var(--green-bright);
  font-weight: 600;
  font-size: 0.78rem;
}

.map-stage .corridor {
  stroke: var(--line-strong);
  stroke-width: 3;
  fill: none;
  transition: stroke 0.18s ease, stroke-width 0.18s ease;
}

.map-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.map-legend span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.map-legend i {
  width: 18px;
  height: 4px;
  border-radius: 2px;
}

/* ----- Directory (routes index) ------------------------------------------ */
.dir-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 12px;
}

.dir-tile {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--surface);
  transition: border-color 0.16s ease, transform 0.16s ease, box-shadow 0.16s ease;
}

.dir-tile:hover {
  border-color: var(--green);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.dir-tile .label {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--text);
}

.dir-tile .label small {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  color: var(--text-subtle);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.dir-group-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--green-bright);
  margin: 36px 0 16px;
}

/* ----- CTA band ----------------------------------------------------------- */
.cta-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: center;
}

@media (max-width: 760px) {
  .cta-band { grid-template-columns: 1fr; }
}

/* ----- Footer ------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg-grid);
  padding-block: 48px 36px;
  margin-top: 24px;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(2, minmax(0, 1fr));
  gap: 32px;
  margin-bottom: 36px;
}

.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-subtle);
  margin-bottom: 14px;
}

.footer-col a {
  display: block;
  padding: 5px 0;
  font-size: 0.92rem;
  color: var(--text-muted);
  transition: color 0.16s ease;
}

.footer-col a:hover { color: var(--green-bright); }

.footer-blurb {
  color: var(--text-muted);
  font-size: 0.92rem;
  max-width: 38ch;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-size: 0.82rem;
  color: var(--text-subtle);
}

.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--green-bright); }

/* ----- Disclaimer note ---------------------------------------------------- */
.note {
  display: flex;
  gap: 12px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
  border-radius: var(--r-md);
  background: var(--surface);
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* ----- Phase 2: actions, favorites, what's-new, command palette ----------- */

/* small pill action buttons (Save / Copy link on route pages) */
.route-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.btn-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  background: var(--surface-2);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  transition: color 0.16s ease, border-color 0.16s ease, background 0.16s ease;
}

.btn-chip:hover {
  color: var(--text);
  border-color: var(--green);
}

.btn-chip .fav-star {
  color: var(--text-subtle);
  transition: color 0.16s ease;
}

.btn-chip.is-saved {
  color: var(--green);
  border-color: var(--green);
  background: rgba(0, 106, 78, 0.08);
}

.btn-chip.is-saved .fav-star { color: var(--amber-soft); }
.btn-chip.is-copied { color: var(--green); border-color: var(--green); }

.card-note {
  margin: 0 0 12px;
  font-size: 0.82rem;
  color: var(--text-subtle);
}

/* "What's new" cards */
.whatsnew-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.whatsnew-card h3 { margin: 4px 0 0; }
.whatsnew-card p { margin: 0; font-size: 0.92rem; }

.whatsnew-key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--r-md);
  background: var(--green-ink);
  color: var(--green);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.1rem;
}

kbd {
  display: inline-block;
  min-width: 1.2em;
  padding: 1px 6px;
  border: 1px solid var(--line-strong);
  border-bottom-width: 2px;
  border-radius: 5px;
  background: var(--surface-2);
  font-family: var(--font-mono);
  font-size: 0.78em;
  color: var(--text-muted);
  text-align: center;
}

/* decoder family (parent + siblings/children) */
.decoder-family { margin-top: 18px; }
.decoder-family .k {
  display: block;
  margin: 0 0 8px;
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-subtle);
}

/* command palette (quick search) */
.cmdk {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
}

.cmdk[hidden] { display: none; }

.cmdk-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(20, 30, 50, 0.42);
  backdrop-filter: blur(3px);
}

.cmdk-panel {
  position: relative;
  width: min(560px, calc(100% - 32px));
  margin: 12vh auto 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
  animation: cmdk-in 0.16s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes cmdk-in {
  from { opacity: 0; transform: translateY(-8px) scale(0.99); }
  to { opacity: 1; transform: none; }
}

.cmdk-field {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  color: var(--text-subtle);
}

.cmdk-field input {
  flex: 1;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  font-size: 1.05rem;
}

.cmdk-field input::placeholder { color: var(--text-subtle); }

.cmdk-results {
  margin: 0;
  padding: 6px;
  list-style: none;
  max-height: 52vh;
  overflow: auto;
}

.cmdk-item {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 11px 12px;
  border-radius: var(--r-md);
  cursor: pointer;
}

.cmdk-item.is-active { background: var(--surface-2); }
.cmdk-id { color: var(--green-bright); font-weight: 600; }
.cmdk-corr {
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.cmdk-axis { color: var(--text-subtle); font-size: 0.74rem; }

.cmdk-empty { padding: 18px 14px; color: var(--text-subtle); font-size: 0.92rem; }

.cmdk-hint {
  padding: 10px 18px;
  border-top: 1px solid var(--line);
  background: var(--surface-2);
  font-size: 0.72rem;
  color: var(--text-subtle);
}

@media (max-width: 520px) {
  .cmdk-panel { margin-top: 8vh; }
  .cmdk-item { grid-template-columns: 56px minmax(0, 1fr); }
  .cmdk-axis { display: none; }
}

/* ----- Scroll reveal ------------------------------------------------------ */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ----- Responsive --------------------------------------------------------- */
@media (max-width: 1000px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }
  .browser { grid-template-columns: 1fr; }
  .detail-panel { position: static; }
  .decoder { grid-template-columns: 1fr; }
  .route-body { grid-template-columns: 1fr; }
  .route-statgrid { grid-template-columns: repeat(2, 1fr); }
  .bento { grid-template-columns: repeat(4, 1fr); }
  .col-3 { grid-column: span 2; }
  .col-4 { grid-column: span 4; }
}

@media (max-width: 860px) {
  .nav-links {
    position: fixed;
    inset: var(--nav-h) 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 20px 20px;
    background: color-mix(in srgb, var(--bg) 97%, transparent);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
    transform: translateY(-120%);
    transition: transform 0.26s cubic-bezier(0.16, 1, 0.3, 1);
  }
  .nav-links.is-open { transform: translateY(0); }
  .nav-link,
  .nav-links a { padding: 13px 4px; font-size: 1rem; border-bottom: 1px solid var(--line); }
  .nav-link.is-active::after,
  .nav-links a.is-active::after { display: none; }
  .nav-toggle { display: inline-flex; }
}

@media (max-width: 720px) {
  .metrics { grid-template-columns: repeat(2, 1fr); }
  .metric:nth-child(2) { border-right: 0; }
  .metric:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .bento { grid-template-columns: 1fr; }
  .col-2, .col-3, .col-4, .col-6 { grid-column: span 1; }
  .footer-top { grid-template-columns: 1fr; gap: 24px; }
  .route-hero { grid-template-columns: 1fr; text-align: left; }
  .toolbar { grid-template-columns: 1fr; }
  .filters { justify-content: flex-start; }
  .glossary div { grid-template-columns: 1fr; gap: 6px; }
  .timeline li { grid-template-columns: 1fr; gap: 6px; }
  .data-list li { grid-template-columns: 1fr; gap: 3px; }
}

@media (max-width: 420px) {
  .route-statgrid { grid-template-columns: 1fr; }
}

/* ----- Reduced motion ----------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
}