/* Saat Farkı Panosu — instrument panel direction.
   No webfonts, no external requests: the CSP below stays closed on purpose. */

:root {
  --ground: #e6e9eb;
  --panel: #fcfcfb;
  --ink: #0d141b;
  --steel: #5d6c7a;
  --hairline: #c7d0d7;
  --accent: #0b5f8a;
  --signal: #c07800;
  --signal-wash: #f6e6c4;

  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "Roboto Mono", Menlo, Consolas, monospace;
  --sans: ui-sans-serif, system-ui, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --gap: 1.5rem;
  --radius: 3px;
}

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

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

body {
  margin: 0;
  padding: clamp(1.5rem, 4vw, 3.5rem) clamp(1rem, 4vw, 3rem) 3rem;
  max-width: 68rem;
  margin-inline: auto;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* ---------------------------------------------------------------- masthead */

.masthead { margin-bottom: clamp(1.5rem, 4vw, 2.5rem); }

.eyebrow {
  margin: 0 0 0.75rem;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--steel);
}

h1 {
  margin: 0;
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 620;
  letter-spacing: -0.02em;
}

.lede {
  margin: 0.5rem 0 0;
  max-width: 44ch;
  color: var(--steel);
}

.link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 1.25rem 0 0;
  padding: 0.3rem 0.7rem 0.3rem 0.55rem;
  border: 1px solid var(--hairline);
  border-radius: 100px;
  background: var(--panel);
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--steel);
}

.link-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--hairline);
}

.link[data-state="live"] .link-dot { background: var(--accent); }
.link[data-state="down"] .link-dot { background: #b03a2e; }
.link[data-state="live"] { color: var(--ink); }

/* ----------------------------------------------------------------- console */

.console {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--gap);
  align-items: stretch;
}

.dial {
  padding: 1.25rem;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--panel);
}

.dial-label {
  display: block;
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--steel);
}

.dial-select {
  width: 100%;
  margin-top: 0.5rem;
  padding: 0.45rem 0.5rem;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: #fff;
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--ink);
}

.dial-clock {
  margin: 1rem 0 0;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.25rem, 7vw, 3.25rem);
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1;
}

.dial-meta {
  display: grid;
  gap: 0.35rem;
  margin: 1rem 0 0;
  padding-top: 0.75rem;
  border-top: 1px solid var(--hairline);
  font-family: var(--mono);
  font-size: 0.75rem;
}

.dial-meta > div { display: flex; justify-content: space-between; gap: 1rem; }
.dial-meta dt { color: var(--steel); }
.dial-meta dd { margin: 0; font-variant-numeric: tabular-nums; }

.delta {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-width: 11rem;
  padding: 1.25rem 1rem;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--panel);
  text-align: center;
}

.delta-label {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  opacity: 0.65;
}

.delta-value {
  margin: 0.5rem 0 0;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2rem, 6vw, 2.75rem);
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1;
}

.delta-note {
  margin: 0.6rem 0 0;
  max-width: 18ch;
  font-size: 0.8125rem;
  line-height: 1.35;
  opacity: 0.8;
}

.delta.is-updated .delta-value { animation: settle 260ms ease-out; }

@keyframes settle {
  from { opacity: 0.25; transform: translateY(-2px); }
  to   { opacity: 1; transform: none; }
}

/* ---------------------------------------------------------------- controls */

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.5rem;
  margin-top: var(--gap);
  padding: 0.85rem 1.1rem;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--panel);
  font-family: var(--mono);
  font-size: 0.75rem;
}

.control { display: flex; align-items: center; gap: 0.5rem; }
.control label { color: var(--steel); letter-spacing: 0.04em; text-transform: uppercase; }
.control-sep { color: var(--steel); }

.controls input[type="number"] {
  width: 3.25rem;
  padding: 0.3rem 0.4rem;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: #fff;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.controls input[type="datetime-local"] {
  padding: 0.3rem 0.4rem;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: #fff;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink);
}

.controls input:disabled { opacity: 0.45; }

.swap, .settings-actions button {
  margin-left: auto;
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--panel);
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
}

.settings-actions button { margin-left: 0; }

.settings-actions .ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--hairline);
}

.swap:hover, .settings-actions button:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
.settings-actions .ghost:hover { background: transparent; color: var(--accent); }

/* -------------------------------------------------------------------- band */

.band {
  margin-top: var(--gap);
  padding: 1.25rem;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--panel);
}

.band-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
}

.band-head h2 {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.625rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--steel);
}

.band-count {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.trace { margin-top: 1rem; }

.trace-row {
  display: grid;
  grid-template-columns: repeat(24, 1fr);
  gap: 2px;
}

.trace-row + .trace-row { margin-top: 2px; }

.cell {
  height: 2.25rem;
  border-radius: 1px;
  background: #eef1f3;
  box-shadow: inset 0 0 0 1px #e2e7ea;
}

.cell.is-working { background: #cfdde5; box-shadow: inset 0 0 0 1px #bfd1db; }
.cell.is-overlap { background: var(--signal-wash); box-shadow: inset 0 0 0 1px var(--signal); }

.trace-axis {
  display: grid;
  grid-template-columns: repeat(24, 1fr);
  gap: 2px;
  margin-top: 0.4rem;
  font-family: var(--mono);
  font-size: 0.5625rem;
  font-variant-numeric: tabular-nums;
  color: var(--steel);
}

.tick { text-align: center; }
.tick.is-blank { visibility: hidden; }

.band-note {
  margin: 0.9rem 0 0;
  font-size: 0.8125rem;
  color: var(--steel);
}

/* ---------------------------------------------------------------- settings */

.settings { margin-top: var(--gap); }

summary {
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
  cursor: pointer;
}

.settings-body {
  margin-top: 0.9rem;
  padding: 1.1rem;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--panel);
}

.settings-hint { margin: 0 0 1rem; font-size: 0.8125rem; color: var(--steel); }

.field { margin-bottom: 0.9rem; }

.field label {
  display: block;
  margin-bottom: 0.3rem;
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--steel);
}

.optional { text-transform: none; letter-spacing: 0; }

.field input {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: #fff;
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--ink);
}

.settings-actions { display: flex; gap: 0.6rem; }

.settings-status {
  margin: 0.8rem 0 0;
  min-height: 1.2em;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
}

/* --------------------------------------------------------------- colophon */

.colophon {
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--hairline);
  font-size: 0.8125rem;
  color: var(--steel);
}

.colophon p { margin: 0.25rem 0; }
.colophon-edge { font-family: var(--mono); font-size: 0.6875rem; letter-spacing: 0.06em; }

.noscript {
  margin-top: var(--gap);
  padding: 1rem;
  border: 1px solid var(--signal);
  border-radius: var(--radius);
  background: var(--signal-wash);
}

/* ------------------------------------------------------------------ focus */

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

/* --------------------------------------------------------------- responsive */

@media (max-width: 760px) {
  .console { grid-template-columns: 1fr; }
  .delta { order: 3; }
  .cell { height: 1.75rem; }
  .swap { margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .delta.is-updated .delta-value { animation: none; }
}