/* CFETI site styles.
   External file only: the site's Content-Security-Policy blocks inline styles and scripts.
   Follows the visitor's system light or dark setting. No web fonts, no external resources. */

:root {
  color-scheme: dark light;

  --bg: #0b1118;
  --bg-glow: rgba(70, 150, 240, 0.14);
  --surface: #111a24;
  --surface-2: #16212d;
  --border: #223244;
  --border-strong: #35506b;
  --text: #e9eef4;
  --muted: #9fb0c2;
  --accent: #6db3ff;
  --accent-solid: #2672c9;
  --accent-solid-hover: #1e63b3;
  --amber-bg: #2a2111;
  --amber-text: #f0b45a;
  --amber-line: #5a4519;
  --focus: #f0b45a;

  --serif: ui-serif, "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --radius: 14px;
  --max: 1080px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f8fa;
    --bg-glow: rgba(38, 114, 201, 0.10);
    --surface: #ffffff;
    --surface-2: #eef2f6;
    --border: #d8e0e8;
    --border-strong: #b5c3d2;
    --text: #0f1720;
    --muted: #475568;
    --accent: #0b5cad;
    --accent-solid: #1d62b8;
    --accent-solid-hover: #164f9a;
    --amber-bg: #fdf3da;
    --amber-text: #7a4f00;
    --amber-line: #ecd49b;
    --focus: #b45f06;
  }
}

/* ---------- Base ---------- */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}

body {
  margin: 0;
  background-color: var(--bg);
  background-image: radial-gradient(900px 420px at 80% -120px, var(--bg-glow), transparent 70%);
  background-repeat: no-repeat;
  color: var(--text);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; height: auto; }

a { color: var(--accent); text-underline-offset: 0.2em; }
a:hover { text-decoration-thickness: 2px; }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 4px;
}

h1, h2, h3 { line-height: 1.15; margin: 0; }
h1, h2 { font-family: var(--serif); font-weight: 600; letter-spacing: -0.015em; }
h3 { font-size: 1.2rem; font-weight: 650; letter-spacing: -0.005em; }
p { margin: 0 0 1rem; }

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 10;
  padding: 0.6rem 1rem;
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--text);
}
.skip:focus { top: 1rem; }

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

.wrap {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

/* ---------- Header ---------- */

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 1.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--text);
  font-weight: 700;
  letter-spacing: 0.16em;
  text-decoration: none;
}

.mark { width: 28px; height: 28px; flex: none; }
.mark-ring { fill: none; stroke: var(--accent); stroke-width: 2.5; }
.mark-core { fill: var(--accent); }

.site-header nav { display: flex; gap: 1.5rem; }
.site-header nav a {
  color: var(--muted);
  font-size: 0.95rem;
  text-decoration: none;
  padding-block: 0.25rem;
  border-bottom: 2px solid transparent;
}
.site-header nav a:hover { color: var(--text); }
.site-header nav a[aria-current="page"] { color: var(--text); border-bottom-color: var(--accent); }

/* ---------- Hero ---------- */

.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 3.5rem;
  align-items: center;
  padding-block: clamp(2.5rem, 7vw, 5.5rem) clamp(2.5rem, 6vw, 4.5rem);
}

.eyebrow {
  margin-bottom: 1rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero h1 {
  font-size: clamp(2.5rem, 6.2vw, 4.25rem);
  margin-bottom: 1.25rem;
}

.lede {
  max-width: 34rem;
  font-size: 1.2rem;
  line-height: 1.6;
  color: var(--muted);
}

.pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.5rem 0 2rem;
  padding: 0;
  list-style: none;
}
.pills li {
  padding: 0.3rem 0.8rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  font-size: 0.9rem;
  color: var(--text);
}

.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 0; }

.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.8rem 1.25rem;
  border: 1px solid transparent;
  border-radius: 10px;
  font-weight: 600;
  text-decoration: none;
  transition: background-color 0.15s, border-color 0.15s;
}
.btn-primary { background: var(--accent-solid); color: #ffffff; }
.btn-primary:hover { background: var(--accent-solid-hover); }
.btn-ghost { border-color: var(--border-strong); color: var(--text); }
.btn-ghost:hover { background: var(--surface); border-color: var(--accent); }

/* ---------- Hero diagram ---------- */

.diagram {
  display: grid;
  grid-template-columns: 1fr 4.5rem 0.8fr;
  align-items: center;
  margin: 0;
}

.dg-device,
.dg-server {
  padding: 1.25rem;
  border-radius: var(--radius);
}
.dg-device { background: var(--surface); border: 1px solid var(--border-strong); }
.dg-server { border: 1px dashed var(--border-strong); }

.dg-label {
  margin: 0 0 0.75rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.dg-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 0.9rem;
  padding: 0;
  list-style: none;
}
.dg-chips li {
  padding: 0.45rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-2);
  font-size: 0.95rem;
}

.dg-note { margin: 0; font-size: 0.95rem; line-height: 1.5; color: var(--muted); }

.dg-link { position: relative; height: 2.5rem; }
.dg-link::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  border-top: 2px dashed var(--border-strong);
}
.dg-x {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  display: grid;
  place-items: center;
  width: 1.9rem;
  height: 1.9rem;
  border: 1px solid var(--amber-line);
  border-radius: 50%;
  background: var(--amber-bg);
  color: var(--amber-text);
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1;
}

/* ---------- Sections ---------- */

.section {
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
  border-top: 1px solid var(--border);
}

.section-head { max-width: 40rem; margin-bottom: 2.25rem; }
.section-head h2 { font-size: clamp(1.8rem, 3.6vw, 2.5rem); margin-bottom: 0.75rem; }
.section-head p { margin: 0; color: var(--muted); font-size: 1.1rem; }

.principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.principles .num {
  display: block;
  margin-bottom: 0.6rem;
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--accent);
}
.principles h3 { margin-bottom: 0.5rem; }
.principles p { margin: 0; color: var(--muted); }

/* ---------- Tool cards ---------- */

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}
.card h3 { font-size: 1.35rem; display: flex; align-items: center; gap: 0.75rem; }
.card .app-icon { width: 40px; height: 40px; border-radius: 10px; flex: none; }
.card .tagline { margin: 0; font-weight: 600; }
.card .desc { margin: 0; color: var(--muted); }
.card .limit {
  margin: auto 0 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.93rem;
  line-height: 1.55;
  color: var(--muted);
}
.card .limit strong {
  display: block;
  margin-bottom: 0.2rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text);
}

.chip {
  align-self: flex-start;
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--amber-line);
  border-radius: 999px;
  background: var(--amber-bg);
  color: var(--amber-text);
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ---------- How it works ---------- */

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}
.steps li { counter-increment: step; }
.steps li::before {
  content: counter(step);
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  margin-bottom: 0.9rem;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--accent);
}
.steps h3 { margin-bottom: 0.4rem; }
.steps p { margin: 0; color: var(--muted); }

/* ---------- Call to action band ---------- */

.band {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
}
.band h2 { font-size: clamp(1.4rem, 3vw, 1.9rem); margin-bottom: 0.4rem; }
.band p { margin: 0; max-width: 34rem; color: var(--muted); }

/* ---------- Content pages ---------- */

.page-head { padding-block: clamp(2.5rem, 6vw, 4.5rem) 2rem; max-width: 46rem; }
.page-head h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); margin-bottom: 1rem; }
.page-head .lede { margin: 0; }

.prose { max-width: 46rem; }
.prose h2 { font-size: clamp(1.5rem, 3vw, 2rem); margin-bottom: 0.9rem; }
.prose p { color: var(--muted); }
.prose p strong { color: var(--text); }

.plain-list { margin: 0 0 1rem; padding: 0; list-style: none; }
.plain-list li {
  position: relative;
  padding: 0.35rem 0 0.35rem 1.5rem;
  color: var(--muted);
}
.plain-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.95rem;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 2px;
  background: var(--accent);
}
.plain-list li strong { color: var(--text); }

.steps-list { margin: 0 0 1rem; padding-left: 1.4rem; color: var(--muted); }
.steps-list li { padding-block: 0.25rem; padding-left: 0.3rem; }
.steps-list li::marker { color: var(--accent); font-family: var(--mono); }

.table-wrap {
  margin: 0 0 1.5rem;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}
table { width: 100%; min-width: 34rem; border-collapse: collapse; }
th, td {
  padding: 0.9rem 1.1rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}
tbody tr:last-child td { border-bottom: 0; }
th {
  background: var(--surface-2);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
td:first-child { font-weight: 600; }
td:last-child { color: var(--muted); }

.fineprint { font-size: 0.93rem; color: var(--muted); }

/* ---------- Footer ---------- */

.site-footer {
  margin-top: 1rem;
  padding-block: 2.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.93rem;
  color: var(--muted);
}
.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem 2rem;
}
.site-footer p { margin: 0; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--text); }
.site-footer .links { display: flex; gap: 1.25rem; }

/* Line up the card sections across the row on wide screens */
@media (min-width: 901px) {
  .card {
    display: grid;
    grid-row: span 5;
    grid-template-rows: subgrid;
    row-gap: 0.75rem;
    align-content: start;
  }
  .card .limit { margin: 0; align-self: start; }
  .card .card-cta { align-self: start; }
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 2.5rem; }
  .cards,
  .principles,
  .steps { grid-template-columns: 1fr; }
  .principles, .steps { gap: 1.75rem; }
}

@media (max-width: 560px) {
  .diagram { grid-template-columns: 1fr; }
  .dg-link { height: 3rem; }
  .dg-link::before {
    left: 50%;
    right: auto;
    top: 0;
    bottom: 0;
    border-top: 0;
    border-left: 2px dashed var(--border-strong);
  }
  .site-header nav { gap: 1rem; }
}

/* ---------- Table on small screens: each row becomes a stacked card ---------- */

@media (max-width: 640px) {
  .table-wrap { overflow: visible; border: 0; background: none; }

  table,
  thead,
  tbody,
  tr,
  td { display: block; width: 100%; min-width: 0; }

  thead {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
  }

  tbody tr {
    margin-bottom: 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    overflow: hidden;
  }

  tbody tr td,
  tbody tr:last-child td { padding: 0.7rem 1rem; border-bottom: 1px solid var(--border); }
  tbody tr td:last-child { border-bottom: 0; }

  td:first-child { background: var(--surface-2); }

  td:nth-child(2)::before,
  td:nth-child(3)::before {
    display: block;
    margin-bottom: 0.15rem;
    font-family: var(--mono);
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
  }
  td:nth-child(2)::before { content: "Where it lives"; }
  td:nth-child(3)::before { content: "Does CFETI receive it?"; }
}

/* ---------- Line breaking: no single word left alone on a last line ---------- */

h1, h2, h3, .lede, .eyebrow { text-wrap: balance; }
p, li, dd, dt, td { text-wrap: pretty; }

/* ---------- Time zones page ---------- */
.tz-stage { margin: 0 0 1.25rem; padding: 0.75rem 0.75rem 0.9rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.tz-map { position: relative; border-radius: 8px; overflow: hidden; background: var(--bg); }
.tz-map svg { display: block; width: 100%; height: auto; }
.tz-map .z { fill: var(--surface-2); stroke: var(--bg); stroke-width: 0.18; cursor: pointer; transition: filter 0.12s; }
.tz-map .z:hover { filter: brightness(1.25); }
.tz-map .z.me { stroke: var(--text); stroke-width: 0.6; stroke-dasharray: 1.6 1; }
.tz-map.has-sel .z:not(.sel) { opacity: 0.62; }
.tz-map .z.sel { stroke: var(--amber-text); stroke-width: 1.1; stroke-dasharray: none; filter: brightness(1.35) drop-shadow(0 0 1.2px var(--amber-text)); }
.tz-badge { position: absolute; top: 0.6rem; left: 0.6rem; z-index: 3; display: flex; align-items: center; gap: 0.55rem; padding: 0.4rem 0.7rem; border: 1.5px solid var(--amber-text); border-radius: 999px; background: var(--surface); color: var(--text); font-size: 0.9rem; pointer-events: none; box-shadow: 0 4px 14px rgba(0, 0, 0, 0.3); }
.tz-badge[hidden] { display: none; }
.tz-sw { width: 0.8rem; height: 0.8rem; border-radius: 50%; border: 1px solid var(--text); flex: none; }
.tz-bl { font-family: var(--mono); font-weight: 700; }
.tz-bt { color: var(--muted); }
.tz-map .land { fill: #ffffff; fill-opacity: 0.2; fill-rule: evenodd; stroke: #ffffff; stroke-opacity: 0.5; stroke-width: 0.18; stroke-linejoin: round; pointer-events: none; }
.tz-map .grid { stroke: #ffffff; stroke-opacity: 0.12; stroke-width: 0.15; fill: none; pointer-events: none; }
.tz-map .grid-eq { stroke-opacity: 0.28; stroke-dasharray: 1.2 1.2; }
.tz-map .sunline { stroke: var(--amber-text); stroke-opacity: 0.7; stroke-width: 0.3; stroke-dasharray: 1 1.4; pointer-events: none; }
.tz-map .sun { fill: var(--amber-text); pointer-events: none; }
.tz-map .sunglow { fill: var(--amber-text); fill-opacity: 0.25; pointer-events: none; }
.tz-ruler { position: relative; height: 1.6rem; font-family: var(--mono); font-size: 0.7rem; color: var(--muted); }
.tz-ruler-top { margin-bottom: 0.3rem; }
.tz-ruler-bottom { margin-top: 0.3rem; color: var(--text); }
.tz-ruler span { position: absolute; top: 0; transform: translateX(-50%); white-space: nowrap; line-height: 1.6rem; }
.tz-ruler .on { color: var(--amber-text); font-weight: 700; }
.tz-ruler-bottom .on { color: var(--amber-text); }
.tz-date { display: flex; align-items: center; flex-wrap: wrap; gap: 0.5rem 0.9rem; margin-top: 0.6rem; font-size: 0.92rem; }
.tz-date label { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.tz-date input { flex: 1 1 14rem; min-width: 0; min-height: 44px; accent-color: var(--accent); cursor: pointer; }
.tz-date output { min-width: 8.5rem; font-family: var(--mono); font-weight: 700; color: var(--text); }
.tz-date button { min-height: 44px; padding: 0 1rem; border: 1px solid var(--border-strong); border-radius: 10px; background: transparent; color: var(--text); font: inherit; cursor: pointer; }
.tz-date button[hidden] { display: none; }
.tz-legend { display: flex; flex-wrap: wrap; gap: 0.4rem 1.4rem; margin-top: 0.4rem; font-size: 0.85rem; color: var(--muted); }
.tz-key::before { content: ""; display: inline-block; width: 0.7rem; height: 0.7rem; margin-right: 0.45rem; border-radius: 50%; vertical-align: -0.05rem; }
.tz-key-sun::before { background: var(--amber-text); }
.tz-key-night::before { background: #2a3a55; border: 1px solid var(--border-strong); }
.tz-key-me::before { width: 0.95rem; height: 0.7rem; border: 1.5px dashed var(--text); border-radius: 3px; vertical-align: -0.1rem; }
.tz-panel { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr); gap: 1.5rem; padding: 1.4rem 1.75rem; border: 2px solid var(--amber-text); border-left: 10px solid var(--zc, var(--amber-text)); border-radius: var(--radius); background: var(--surface); box-shadow: 0 0 0 4px rgba(240, 180, 90, 0.16); }
@supports (background: color-mix(in srgb, red 10%, blue)) {
  .tz-panel { background: linear-gradient(90deg, color-mix(in srgb, var(--zc, var(--surface)) 22%, var(--surface)), var(--surface) 65%); }
}
.tz-panel.flash { animation: tzflash 0.9s ease-out; }
@keyframes tzflash { from { box-shadow: 0 0 0 0 rgba(240, 180, 90, 0.7); } to { box-shadow: 0 0 0 4px rgba(240, 180, 90, 0.16); } }
.tz-panel p { margin: 0; }
.tz-k { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.tz-name { margin-top: 0.4rem !important; font-family: var(--serif); font-size: clamp(2.1rem, 5vw, 3rem); font-weight: 600; line-height: 1.1; }
.tz-now { margin-top: 0.4rem !important; font-size: 1.3rem; color: var(--accent); font-weight: 600; }
.tz-places { margin-top: 0.4rem !important; color: var(--muted); font-size: 0.97rem; line-height: 1.55; }
.tz-me { margin-top: 0.7rem !important; color: var(--amber-text); font-size: 0.93rem; }
.tz-me:empty { display: none; }
.tz-list { margin: 1.5rem 0 1rem; padding: 0; list-style: none; display: grid; gap: 0.5rem; grid-template-columns: repeat(auto-fill, minmax(10.5rem, 1fr)); }
.tz-list button { display: flex; flex-direction: column; align-items: flex-start; gap: 0.1rem; width: 100%; min-height: 44px; padding: 0.55rem 0.8rem; border: 1px solid var(--border); border-left-width: 5px; border-radius: 10px; background: var(--surface); color: var(--text); font: inherit; text-align: left; cursor: pointer; }
.tz-list button:hover { border-color: var(--accent); }
.tz-list button[aria-pressed="true"] { border-color: var(--amber-text); background: var(--surface-2); }
.tz-l { font-family: var(--mono); font-size: 0.92rem; }
.tz-t { font-size: 0.85rem; color: var(--muted); }
@media (max-width: 760px) {
  .tz-panel { grid-template-columns: 1fr; gap: 1rem; padding: 1rem 1rem 1rem 1.1rem; border-left-width: 8px; }
  .tz-badge { top: 0.35rem; left: 0.35rem; padding: 0.25rem 0.55rem; font-size: 0.78rem; }
  .tz-bt { display: none; }
  .tz-ruler { font-size: 0.64rem; }
  .tz-ruler span:not(.k3) { display: none; }
}
@media (max-width: 480px) {
  .tz-stage { padding: 0.5rem 0.5rem 0.7rem; }
  .tz-ruler span:not(.k6) { display: none; }
}
.prose h2:not(:first-child) { margin-top: 2.25rem; }
@media (prefers-color-scheme: light) { .tz-map .land { fill-opacity: 0.38; stroke-opacity: 0.8; } }
@media (prefers-reduced-motion: reduce) { .tz-panel.flash { animation: none; } }

.chip-live { border-color: var(--accent); background: var(--surface-2); color: var(--accent); }
.card .card-cta { margin: 0.4rem 0 0.75rem; }
.site-footer .wrap > div p + p { margin-top: 0.3rem; }