/* StationWatch: light theme. */
:root {
  color-scheme: light;
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-2: #f1f5f9;
  --surface-3: #e8eef6;
  --text: #0f172a;
  --text-2: #475569;
  --muted: #64748b;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --grid: #e5e9f0;
  --axis: #cbd5e1;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-soft: #eff6ff;
  --accent-ink: #ffffff;
  --good: #0ca30c;
  --critical: #d03b3b;
  --warning: #fab219;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 8px 24px rgba(15, 23, 42, 0.06);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}
[hidden] {
  display: none !important;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 var(--font);
  -webkit-font-smoothing: antialiased;
}
a {
  color: var(--accent);
  text-underline-offset: 2px;
}
h1,
h2,
h3,
h4 {
  line-height: 1.2;
  margin: 0;
  letter-spacing: -0.01em;
}
.wrap {
  width: min(1140px, 100% - 32px);
  margin-inline: auto;
}

/* --- top bar ---------------------------------------------------------------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--border);
}
.topbar-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 750;
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
}
.nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.nav a {
  color: var(--text-2);
  text-decoration: none;
  font-weight: 550;
  font-size: 0.92rem;
  padding: 0.45rem 0.7rem;
  border-radius: 8px;
}
.nav a:hover {
  color: var(--text);
  background: var(--surface-2);
}
.nav a.nav-cta {
  color: var(--accent);
  background: var(--accent-soft);
}
@media (max-width: 560px) {
  .nav a:not(.nav-cta) {
    display: none;
  }
}

/* --- hero ------------------------------------------------------------------ */
.hero {
  background:
    radial-gradient(900px 420px at 85% 0%, rgba(59, 130, 246, 0.12), transparent 70%),
    radial-gradient(700px 360px at 0% 100%, rgba(52, 211, 153, 0.1), transparent 70%),
    linear-gradient(180deg, #ffffff 0%, var(--bg) 100%);
  border-bottom: 1px solid var(--border);
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 3rem;
  align-items: center;
  padding: 4rem 0 4.5rem;
}
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2.5rem 0 3rem;
  }
}
.eyebrow {
  display: inline-block;
  margin: 0 0 1rem;
  font-size: 0.8rem;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
}
.hero h1 {
  font-size: clamp(2.1rem, 4.2vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -0.025em;
}
.lead {
  color: var(--text-2);
  font-size: 1.1rem;
  margin: 1.1rem 0 1.6rem;
  max-width: 36rem;
}
.t-working {
  color: #087f08;
}
.t-stopped {
  color: #b42d2d;
}
.t-idle {
  color: #a86f00;
}
.hero-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0;
  margin: 1.6rem 0 0;
}
.chips li {
  font-size: 0.85rem;
  color: var(--text-2);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.3rem 0.75rem 0.3rem 0.6rem;
  box-shadow: var(--shadow-sm);
}
.chips li::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--good);
  margin-right: 0.45rem;
  vertical-align: 1px;
}
.hero-media {
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 10px;
  box-shadow: 0 20px 50px -20px rgba(30, 64, 175, 0.35), var(--shadow);
}
.hero-media video {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 12px;
  background: #0f172a;
}
.hero-media figcaption {
  font-size: 0.8rem;
  color: var(--muted);
  padding: 0.55rem 0.3rem 0.1rem;
}

/* --- buttons --------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font: 600 0.95rem var(--font);
  border-radius: var(--radius-sm);
  padding: 0.62rem 1.1rem;
  border: 1px solid var(--border-strong);
  cursor: pointer;
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  transition:
    background 0.15s,
    border-color 0.15s,
    box-shadow 0.15s;
}
.btn:hover {
  background: var(--surface-2);
}
.btn:disabled {
  opacity: 0.55;
  cursor: default;
}
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
  box-shadow: 0 6px 16px -6px rgba(37, 99, 235, 0.6);
}
.btn.primary:hover {
  background: var(--accent-hover);
}
.btn.secondary {
  background: var(--surface);
  border-color: var(--border-strong);
}
.btn.ghost {
  background: transparent;
  border-color: var(--border);
}
.btn.small {
  padding: 0.45rem 0.85rem;
  font-size: 0.88rem;
}
.btn.icon {
  min-width: 4.5rem;
}
.btn:focus-visible,
.demo:focus-visible,
.nav a:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.35);
  outline-offset: 2px;
}

/* --- app ------------------------------------------------------------------------- */
.app {
  padding: 3.5rem 0 1rem;
}
.section-head {
  margin-bottom: 1.4rem;
}
.section-head h2 {
  font-size: 1.75rem;
  font-weight: 780;
}
.section-head p {
  color: var(--text-2);
  margin: 0.4rem 0 0;
  max-width: 44rem;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.1rem;
  box-shadow: var(--shadow);
}
.card h3 {
  font-size: 1.12rem;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 1rem;
}
.card h4 {
  font-size: 0.98rem;
  margin: 1.8rem 0 0.45rem;
}
.step-num {
  display: inline-grid;
  place-items: center;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.88rem;
  font-weight: 750;
  border: 1px solid #bfdbfe;
}
.hint {
  color: var(--text-2);
  font-size: 0.9rem;
  margin: 0 0 0.7rem;
}

.choose-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  gap: 1rem;
}
@media (max-width: 760px) {
  .choose-row {
    grid-template-columns: 1fr;
  }
}
.drop-zone {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 0.35rem;
  min-height: 190px;
  padding: 1.3rem;
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface-2);
  color: var(--accent);
  cursor: pointer;
  transition:
    background 0.15s,
    border-color 0.15s;
}
.drop-zone strong {
  color: var(--text);
  font-size: 1rem;
}
.drop-zone span {
  color: var(--text-2);
  font-size: 0.88rem;
  max-width: 22rem;
}
.drop-zone:hover,
.drop-zone.over {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.drop-zone input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}
.drop-zone:focus-within {
  outline: 3px solid rgba(37, 99, 235, 0.35);
  outline-offset: 2px;
}
.demo-list {
  display: grid;
  gap: 0.75rem;
  align-content: start;
}
.demo {
  display: grid;
  grid-template-columns: 116px minmax(0, 1fr);
  gap: 0.9rem;
  align-items: center;
  text-align: left;
  font: inherit;
  color: inherit;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0.6rem;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition:
    border-color 0.15s,
    box-shadow 0.15s,
    transform 0.15s;
}
.demo:hover {
  border-color: #93c5fd;
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}
.demo img {
  width: 116px;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 9px;
  background: var(--surface-3);
  display: block;
}
@media (max-width: 480px) {
  .demo {
    grid-template-columns: 84px minmax(0, 1fr);
  }
  .demo img {
    width: 84px;
  }
}
.demo strong {
  display: block;
  font-size: 0.95rem;
}
.demo div {
  line-height: 1.4;
}
.demo span {
  display: block;
  color: var(--text-2);
  font-size: 0.85rem;
}
.demo .tag {
  display: inline-block;
  width: fit-content;
  font-size: 0.72rem;
  font-weight: 650;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 0.05rem 0.5rem;
  margin-bottom: 0.25rem;
}

.roi-wrap {
  display: flex;
  justify-content: center;
  background: #0f172a;
  border-radius: 12px;
  overflow: hidden;
  line-height: 0;
}
#roi-canvas {
  max-width: 100%;
  max-height: 64vh;
  width: auto;
  height: auto;
  cursor: crosshair;
  touch-action: manipulation;
}
.roi-tools {
  display: flex;
  gap: 0.6rem;
  align-items: flex-end;
  flex-wrap: wrap;
  margin-top: 0.9rem;
}
.roi-text-label {
  flex: 1 1 280px;
  display: grid;
  gap: 0.25rem;
  font-size: 0.82rem;
  color: var(--text-2);
}
input[type="text"],
select {
  font: inherit;
  font-size: 0.92rem;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  padding: 0.5rem 0.65rem;
}
input[type="text"]:focus,
select:focus {
  outline: 3px solid rgba(37, 99, 235, 0.25);
  border-color: var(--accent);
}
#roi-text {
  font-family: var(--mono);
  font-size: 0.85rem;
}

.settings {
  margin-top: 1.1rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.8rem 1rem;
  background: var(--surface-2);
}
.settings summary {
  cursor: pointer;
  font-weight: 650;
  font-size: 0.92rem;
}
.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem 1.5rem;
  margin-top: 1rem;
}
.settings-grid label {
  display: grid;
  gap: 0.3rem;
  font-size: 0.88rem;
}
.settings-grid small {
  color: var(--muted);
}
.settings-grid label.check {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
output {
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  font-weight: 650;
  margin-left: 0.3rem;
}
input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.run-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1.2rem;
  flex-wrap: wrap;
}
#analyse-btn {
  padding: 0.75rem 2rem;
  font-size: 1rem;
}
.progress {
  flex: 1 1 280px;
  display: grid;
  gap: 0.35rem;
}
.progress-bar {
  height: 8px;
  border-radius: 999px;
  background: var(--surface-3);
  overflow: hidden;
}
.progress-bar span {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, #3b82f6, #2563eb);
  border-radius: 999px;
  transition: width 0.2s;
}
.progress-text {
  font-size: 0.86rem;
  color: var(--text-2);
  font-variant-numeric: tabular-nums;
}

.error {
  border: 1px solid #fecaca;
  color: #991b1b;
  background: #fef2f2;
  border-radius: 12px;
  padding: 0.85rem 1rem;
  margin-bottom: 1rem;
}

/* --- results --------------------------------------------------------------------- */
.results-top {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(270px, 2fr);
  gap: 1.4rem;
}
@media (max-width: 880px) {
  .results-top {
    grid-template-columns: 1fr;
  }
}
.player canvas {
  width: 100%;
  height: auto;
  border-radius: 12px;
  background: #0f172a;
  display: block;
}
.player-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.6rem;
}
.replay-time {
  font-variant-numeric: tabular-nums;
  font-size: 0.86rem;
  color: var(--text-2);
  min-width: 4.5rem;
  text-align: right;
}
.final {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 750;
  font-size: 1.08rem;
  margin-bottom: 0.9rem;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  background: var(--surface-2);
  border: 1px solid var(--border);
}
.state-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  display: inline-block;
  flex: none;
}
.tiles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
}
.tile {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.7rem 0.85rem;
}
.tile .label {
  font-size: 0.8rem;
  color: var(--text-2);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.tile .value {
  font-size: 1.45rem;
  font-weight: 720;
}
.tile .sub {
  font-size: 0.78rem;
  color: var(--muted);
}
.gt-note,
.run-info {
  font-size: 0.86rem;
  color: var(--text-2);
  margin: 0.85rem 0 0;
}
.gt-note {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  color: #14532d;
  border-radius: 10px;
  padding: 0.6rem 0.75rem;
}

.chart {
  position: relative;
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.6rem 0.4rem 0.2rem;
}
.timeline-svg {
  display: block;
  font-family: var(--font);
}
.timeline-svg .gridline {
  stroke: var(--grid);
  stroke-width: 1;
}
.timeline-svg .baseline {
  stroke: var(--axis);
  stroke-width: 1;
}
.timeline-svg .threshold {
  stroke: var(--muted);
  stroke-width: 1;
}
.timeline-svg .series-line {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2;
  stroke-linejoin: round;
  stroke-linecap: round;
}
.timeline-svg .axis-label {
  fill: var(--muted);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
}
.timeline-svg .panel-title {
  fill: var(--text-2);
  font-size: 12px;
  font-weight: 600;
}
.timeline-svg .band-label {
  fill: #ffffff;
  font-size: 12px;
  font-weight: 600;
}
.timeline-svg .band-label.dark {
  fill: #1a1a19;
}
.timeline-svg .crosshair {
  stroke: var(--text-2);
  stroke-width: 1;
}
.timeline-svg .cursor {
  stroke: var(--text);
  stroke-width: 1.5;
}
.chart-tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  border-radius: 10px;
  padding: 0.55rem 0.75rem;
  font-size: 0.82rem;
  display: grid;
  gap: 0.15rem;
  min-width: 170px;
}
.chart-tooltip i {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 3px;
  margin-right: 0.4rem;
  vertical-align: -1px;
}

.results-bottom {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  gap: 1.4rem;
}
@media (max-width: 880px) {
  .results-bottom {
    grid-template-columns: 1fr;
  }
}
table.events {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}
.events th {
  text-align: left;
  color: var(--text-2);
  font-weight: 600;
  border-bottom: 1px solid var(--border-strong);
  padding: 0.45rem 0.5rem 0.45rem 0;
}
.events td {
  border-bottom: 1px solid var(--grid);
  padding: 0.5rem 0.5rem 0.5rem 0;
  font-variant-numeric: tabular-nums;
}
.events td.change {
  font-variant-numeric: normal;
}
.events tr {
  cursor: pointer;
}
.events tbody tr:hover td {
  background: var(--accent-soft);
}
.snapshots {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 0.65rem;
}
.snapshots figure {
  margin: 0;
}
.snapshots img {
  width: 100%;
  border-radius: 10px;
  display: block;
  cursor: pointer;
  border: 1px solid var(--border);
}
.snapshots figcaption {
  font-size: 0.78rem;
  color: var(--text-2);
  margin-top: 0.25rem;
}
.downloads {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}
.downloads a,
.downloads button {
  font: 600 0.88rem var(--font);
  text-decoration: none;
  color: var(--text);
  border: 1px solid var(--border-strong);
  background: var(--surface);
  border-radius: 9px;
  padding: 0.5rem 0.9rem;
  cursor: pointer;
}
.downloads a:hover,
.downloads button:hover {
  background: var(--accent-soft);
  border-color: #93c5fd;
}

/* --- how it works ------------------------------------------------------------------ */
.how {
  padding: 3.5rem 0 3rem;
  margin-top: 2rem;
  background: var(--surface);
  border-top: 1px solid var(--border);
}
.how-grid {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  counter-reset: step;
}
@media (max-width: 960px) {
  .how-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 560px) {
  .how-grid {
    grid-template-columns: 1fr;
  }
}
.how-grid li {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem;
}
.how-grid h3 {
  font-size: 1rem;
  margin: 0.8rem 0 0.35rem;
}
.how-grid p {
  color: var(--text-2);
  font-size: 0.9rem;
  margin: 0;
}
.how-icon {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--accent-soft);
  border: 1px solid #bfdbfe;
}
.how-icon svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.states {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
  margin-top: 1.2rem;
}
@media (max-width: 760px) {
  .states {
    grid-template-columns: 1fr;
  }
}
.states div {
  font-size: 0.9rem;
  color: var(--text-2);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.75rem 0.9rem;
}
.states strong {
  color: var(--text);
  margin-right: 0.25rem;
}
.dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 0.45rem;
  vertical-align: 0;
}
.dot.working {
  background: var(--good);
}
.dot.stopped {
  background: var(--critical);
}
.dot.idle {
  background: var(--warning);
}
.more {
  color: var(--text-2);
  font-size: 0.92rem;
  margin: 1.4rem 0 0;
}

/* --- footer ------------------------------------------------------------------------ */
.footer {
  background: var(--bg);
  border-top: 1px solid var(--border);
  padding: 1.8rem 0 2.2rem;
}
.footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.made-by {
  margin: 0;
  font-weight: 650;
  font-size: 1rem;
}
.made-by a {
  color: var(--text);
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
}
.fine {
  margin: 0.2rem 0 0;
  font-size: 0.8rem;
  color: var(--muted);
}
.footer-links {
  display: flex;
  gap: 0.55rem;
  flex-wrap: wrap;
}

/* The decoding <video> must stay inside the viewport: Chrome ignores seeks on
   elements positioned far off-screen. 1 px and nearly transparent instead. */
.video-source {
  position: fixed;
  left: 0;
  top: 0;
  width: 1px;
  height: 1px;
  opacity: 0.01;
  pointer-events: none;
  z-index: -1;
}