/*
 * Warm paper and ink with one vermilion accent -- a desk clock, not a
 * dashboard. System font stacks only: the CSP forbids fetching fonts, and a
 * clock should render instantly.
 */
:root {
  --paper: #f3eee4;
  --card: #fbf8f2;
  --ink: #1b1a17;
  /* 5.3:1 on --paper, 5.8:1 on --card: body-text contrast, not decoration. */
  --muted: #5f5a50;
  --line: #d8cfbf;
  /* Control outlines must reach 3:1 (WCAG 1.4.11) against both --paper and
     --card; --line is too faint for that and stays for decorative rules. */
  --control-border: #857c6c;
  --strip: #e3dacb;
  --accent: #c43d17;
  --accent-ink: #ffffff;
  --accent-soft: #f6dccf;
  --danger: #a61b1b;
  --focus: #1f5fd1;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 1px 0 rgb(27 26 23 / 6%), 0 18px 40px -24px rgb(27 26 23 / 35%);
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #131417;
    --card: #1b1c20;
    --ink: #ece6da;
    --muted: #a8a194;
    --line: #2e3036;
    --control-border: #6b6f78;
    --strip: #0c0d0f;
    --accent: #ff8052;
    --accent-ink: #1b0d07;
    --accent-soft: #3a1d12;
    --danger: #ff8a8a;
    --focus: #7fb0ff;
    --shadow: 0 1px 0 rgb(0 0 0 / 40%), 0 20px 44px -24px rgb(0 0 0 / 80%);
  }
}

* {
  box-sizing: border-box;
}

/* `hidden` is only display:none in the UA sheet; author display rules beat it. */
[hidden] {
  /* biome-ignore lint/complexity/noImportantStyles: must beat every author display rule */
  display: none !important;
}

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px / 1.55 var(--sans);
}

.page {
  max-width: 60rem;
  margin: 0 auto;
  padding: clamp(1rem, 4vw, 2.5rem) clamp(1rem, 4vw, 2rem) 3rem;
}

a {
  color: var(--accent);
  text-underline-offset: 0.18em;
}

code {
  font-family: var(--mono);
  font-size: 0.92em;
  background: var(--accent-soft);
  border-radius: 4px;
  padding: 0.05em 0.3em;
}

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

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.skip {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--ink);
  color: var(--paper);
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-sm);
  z-index: 1;
}

.skip:focus {
  top: 1rem;
}

/* ---------------------------------------------------------------- header */

.masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.25rem 1.5rem;
  margin-bottom: 1.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin: 0;
  font: 600 1.6rem / 1 var(--serif);
  letter-spacing: -0.01em;
}

.brand img {
  align-self: center;
}

.tagline {
  margin: 0;
  color: var(--muted);
  font-family: var(--serif);
  font-size: 1.1rem;
}

.tagline em {
  color: var(--ink);
}

/* ----------------------------------------------------------------- stage */

.stage {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  /* The clock sizes itself against this width (cqi). */
  container-type: inline-size;
  margin-bottom: 1.5rem;
}

.browser {
  background: var(--strip);
  border-bottom: 1px solid var(--line);
  user-select: none;
}

.tabstrip {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  padding: 0.55rem 0.75rem 0;
  overflow: hidden;
}

.tab {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
  height: 2.25rem;
  padding: 0 0.75rem;
  border-radius: 10px 10px 0 0;
  font-size: 0.8rem;
  white-space: nowrap;
}

.tab--ghost {
  flex: 0 1 9rem;
  /* Muted colour alone: an extra opacity pushed these under 4.5:1 contrast. */
  color: var(--muted);
}

/* Hide the neighbour tabs on phones; the active one is what matters. */
@media (max-width: 34rem) {
  .tab--ghost:last-of-type {
    display: none;
  }
}

.tab--active {
  /* Roughly the width a desktop browser gives a tab when a handful are open.
     Measured in this page's monospace, which is wider than a browser's tab
     font: at 15rem the default 23-character title already faded out, and the
     first thing a visitor saw was a truncation warning about the default. */
  flex: 0 1 17.5rem;
  background: var(--card);
  color: var(--ink);
  position: relative;
}

.tab-icon {
  flex: none;
  width: 16px;
  height: 16px;
}

.tab-icon--blank {
  border-radius: 50%;
  background: var(--line);
}

.tab-title {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: clip;
  font-variant-numeric: tabular-nums;
}

/* Chromium fades a long title out rather than using an ellipsis; mimic that. */
.tab--active.is-truncated .tab-title {
  mask-image: linear-gradient(to right, #000 calc(100% - 1.75rem), transparent);
}

.tab-close {
  flex: none;
  color: var(--muted);
}

.tab-new {
  align-self: center;
  padding: 0 0.6rem 0.4rem;
  color: var(--muted);
}

.omnibar {
  background: var(--card);
  padding: 0.35rem 0.75rem 0.6rem;
}

.omnibar-url {
  display: block;
  background: var(--paper);
  border-radius: 999px;
  padding: 0.3rem 0.9rem;
  font-size: 0.8rem;
  color: var(--muted);
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.clock {
  margin: 0;
  padding: clamp(1.75rem, 6vw, 3.25rem) clamp(1rem, 4vw, 2rem) 0.5rem;
  /* Sized from the title length (--len, set by app.js) so a short clock stays
     big and a long ISO or custom title still fits one line; a mono glyph is
     ~0.6em wide. cqi is the card's width, see container-type below. */
  font:
    500 clamp(1.1rem, min(6.5vw, calc(92cqi / (var(--len, 20) * 0.6))), 4.25rem) / 1.1 var(--mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.03em;
  text-align: center;
  overflow-wrap: anywhere;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.25rem 1rem;
  margin: 0;
  padding: 0 1rem clamp(1.25rem, 4vw, 2rem);
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
}

.trunc-hint {
  color: var(--accent);
}

.noscript {
  text-align: center;
  padding: 0 1rem 1.5rem;
}

/* ---------------------------------------------------------------- panels */

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(1rem, 3vw, 1.75rem);
  margin-bottom: 1.5rem;
}

.panel--note {
  background: transparent;
}

h2 {
  margin: 0 0 1rem;
  font: 600 1.35rem / 1.2 var(--serif);
}

fieldset {
  border: 0;
  margin: 0;
  padding: 0;
  min-width: 0;
}

legend,
.field > label:not(.check) {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
  padding: 0;
}

.presets {
  margin-bottom: 1.25rem;
}

.preset-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr));
  gap: 0.5rem;
}

.preset {
  position: relative;
  display: grid;
  gap: 0.15rem;
  padding: 0.7rem 0.85rem 0.7rem 2.3rem;
  border: 1px solid var(--control-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: var(--paper);
}

.preset:hover {
  border-color: var(--muted);
}

.preset:has(input:checked) {
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent);
  background: var(--card);
}

.preset:has(input:focus-visible) {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

/* The card already carries the ring; a second one on the radio is noise. */
.preset input:focus-visible {
  outline: none;
}

.preset input {
  position: absolute;
  left: 0.85rem;
  top: 0.95rem;
  margin: 0;
  accent-color: var(--accent);
}

.preset-name {
  font-weight: 600;
  font-size: 0.9rem;
}

.preset-sample {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}

.field {
  min-width: 0;
}

.field--wide {
  margin-bottom: 1.25rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1.25rem 1.5rem;
}

input[type="text"] {
  width: 100%;
  font: inherit;
  color: inherit;
  background: var(--paper);
  border: 1px solid var(--control-border);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.75rem;
}

#format {
  font-family: var(--mono);
}

input[type="text"]:hover {
  border-color: var(--muted);
}

input[type="text"]:focus-visible {
  outline-offset: 0;
  border-color: var(--focus);
}

input[aria-invalid="true"] {
  border-color: var(--danger);
}

/* No opacity: "Browser default" explains what an empty field means, so it
   needs full text contrast (--muted is 5.3:1). Firefox dims placeholders by
   default, hence the explicit 1. */
input::placeholder {
  color: var(--muted);
  opacity: 1;
}

.help {
  margin: 0.4rem 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.error {
  margin: 0.4rem 0 0;
  color: var(--danger);
  font-size: 0.85rem;
}

/* Not an error -- the title still works -- but worth reading. */
.note {
  margin: 0.4rem 0 0;
  padding: 0.4rem 0.6rem;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.85rem;
}

.segments {
  display: inline-flex;
  border: 1px solid var(--control-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--paper);
}

.segments label {
  position: relative;
  cursor: pointer;
}

.segments label + label {
  border-left: 1px solid var(--control-border);
}

/* Visually hidden but still focusable and operable with the arrow keys. */
.segments input {
  position: absolute;
  opacity: 0;
  inset: 0;
  margin: 0;
  cursor: pointer;
}

.segments span {
  display: block;
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
}

.segments input:checked + span {
  background: var(--ink);
  color: var(--paper);
}

.segments input:focus-visible + span {
  outline: 3px solid var(--focus);
  outline-offset: -3px;
}

.field--check {
  align-self: end;
}

.check {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
}

/* Controls that have no effect on the current format are disabled rather
   than left to toggle visibly nothing. */
.check:has(input:disabled),
fieldset:disabled .segments {
  opacity: 0.5;
  cursor: not-allowed;
}

fieldset:disabled .segments label,
fieldset:disabled .segments input {
  cursor: not-allowed;
}

.check input {
  width: 1.1rem;
  height: 1.1rem;
  margin: 0;
  accent-color: var(--accent);
}

/* --------------------------------------------------------------- actions */

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}

.button {
  font: 600 0.95rem / 1 var(--sans);
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.7rem 1.2rem;
  cursor: pointer;
}

.button:hover {
  border-color: var(--ink);
}

.button--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

.button--primary:hover {
  border-color: var(--accent);
  filter: brightness(1.08);
}

.status {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

/* ---------------------------------------------------------------- tokens */

.tokens {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.tokens th {
  text-align: left;
  font-weight: 600;
  color: var(--muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0 0.75rem 0.5rem 0;
  border-bottom: 1px solid var(--line);
}

.tokens td {
  padding: 0.45rem 0.75rem 0.45rem 0;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

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

.token-example {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}

@media (max-width: 30rem) {
  .tokens th:nth-child(3),
  .tokens td:nth-child(3) {
    display: none;
  }
}

/* ---------------------------------------------------------------- footer */

.footer {
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
}

@media (prefers-reduced-motion: no-preference) {
  .preset,
  .button,
  input[type="text"] {
    transition:
      border-color 120ms ease,
      background-color 120ms ease,
      filter 120ms ease;
  }
}