:root {
  color-scheme: light;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --bg: #f4f5f7;
  --surface: #ffffff;
  --surface-2: #f0f1f4;
  --border: #d9dce2;
  --text: #1c1f24;
  --text-muted: #5f6672;
  --accent: #c8302a;
  --accent-hover: #a82620;
  --accent-text: #ffffff;
  --focus: #2b6cd4;
  --error-bg: #fdecea;
  --error-text: #8a1c14;
  --info-bg: #e8f0fc;
  --info-text: #1d3f78;
  --chart-bg: #ffffff;
  --chart-grid: #e2e5ea;
  --radius: 8px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #121418;
    --surface: #1b1e24;
    --surface-2: #242830;
    --border: #343a44;
    --text: #e7e9ed;
    --text-muted: #9aa1ad;
    --accent: #cf3b33;
    --accent-hover: #e0483f;
    --focus: #6ea0f0;
    --error-bg: #3a1c1a;
    --error-text: #f6b3ac;
    --info-bg: #1a2a44;
    --info-text: #b7cdf3;
    --chart-bg: #1b1e24;
    --chart-grid: #333944;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #121418;
  --surface: #1b1e24;
  --surface-2: #242830;
  --border: #343a44;
  --text: #e7e9ed;
  --text-muted: #9aa1ad;
  --accent: #cf3b33;
  --accent-hover: #e0483f;
  --focus: #6ea0f0;
  --error-bg: #3a1c1a;
  --error-text: #f6b3ac;
  --info-bg: #1a2a44;
  --info-text: #b7cdf3;
  --chart-bg: #1b1e24;
  --chart-grid: #333944;
}

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

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.45;
  color: var(--text);
  background: var(--bg);
}

a {
  color: inherit;
}

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

.muted {
  color: var(--text-muted);
}

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

.app-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 16px;
  padding: 16px 24px 8px;
}

.app-header h1 {
  margin: 0;
  font-size: 22px;
  letter-spacing: -0.01em;
}

.app-header p {
  margin: 0;
  color: var(--text-muted);
}

.app-footer {
  padding: 8px 24px 24px;
  color: var(--text-muted);
  font-size: 13px;
}

/* ---- Layout ------------------------------------------------------------ */

.layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 16px;
  padding: 8px 24px 16px;
  align-items: start;
}

.sidebar,
.workspace {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 16px;
  position: sticky;
  top: 16px;
  max-height: calc(100vh - 32px);
}

.workspace {
  min-width: 0;
  overflow: hidden;
}

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

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.field > span:first-child,
.group-label,
legend {
  font-weight: 600;
  font-size: 13px;
}

.field.inline {
  flex-direction: row;
  align-items: center;
  gap: 8px;
}

select,
input[type="number"] {
  font: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 8px;
  min-height: 34px;
  max-width: 100%;
}

input[type="number"] {
  width: 4.5em;
}

input[type="number"]:disabled {
  opacity: 0.5;
}

input[type="checkbox"] {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
  margin: 0;
}

.check {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  white-space: nowrap;
}

.with-suffix {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.button {
  font: inherit;
  font-weight: 600;
  border-radius: 6px;
  padding: 7px 16px;
  min-height: 34px;
  cursor: pointer;
  border: 1px solid transparent;
}

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

.button.primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

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

.button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

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

legend {
  padding: 0;
  margin-bottom: 4px;
}

.hint {
  margin: 0;
  color: var(--text-muted);
  max-width: 60ch;
}

/* ---- Driver list ------------------------------------------------------- */

/* The list takes whatever height the sidebar has left and scrolls inside
   it, however many drivers the season has. */
.drivers {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-height: 0;
  flex: 1 1 auto;
}

.driver-list {
  list-style: none;
  margin: 0;
  padding: 4px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-2);
  min-height: 160px;
  flex: 1 1 auto;
}

.team-heading {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 8px 6px 2px;
}

.team-heading:first-child {
  padding-top: 2px;
}

.driver-empty {
  padding: 8px 6px;
  color: var(--text-muted);
}

.driver {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 6px;
  border-radius: 4px;
  cursor: pointer;
}

.driver:hover {
  background: var(--surface);
}

.driver:has(input:disabled) {
  opacity: 0.5;
  cursor: not-allowed;
}

.swatch {
  flex: none;
  width: 12px;
  height: 12px;
  border-radius: 3px;
}

.acronym {
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  min-width: 3.2em;
}

.full-name {
  color: var(--text-muted);
  font-size: 13px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.drivers-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 8px;
  font-size: 13px;
}

/* ---- Tabs -------------------------------------------------------------- */

.tabs {
  display: flex;
  gap: 4px;
  padding: 8px 8px 0;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  scrollbar-width: none;
}

[role="tab"] {
  font: inherit;
  font-weight: 600;
  color: var(--text-muted);
  background: none;
  border: 0;
  border-bottom: 3px solid transparent;
  padding: 8px 14px 9px;
  cursor: pointer;
  white-space: nowrap;
}

[role="tab"]:hover {
  color: var(--text);
}

[role="tab"][aria-selected="true"] {
  color: var(--text);
  border-bottom-color: var(--accent);
}

/* ---- Panels ------------------------------------------------------------ */

.panel {
  padding: 16px;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.per-driver-laps {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}

.per-driver-laps .field > span:first-child {
  min-width: 2.6em;
}

.channels {
  display: flex;
  align-items: center;
  gap: 8px 12px;
  flex-wrap: wrap;
}

.channels legend {
  float: left;
  margin: 0 4px 0 0;
}

.channel-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
}

.chart {
  padding-top: 12px;
  min-height: 420px;
}

.chart-title {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 600;
}

.chart-title:empty {
  display: none;
}

.placeholder {
  margin: 0;
  display: grid;
  place-items: center;
  min-height: 380px;
  padding: 24px;
  text-align: center;
  color: var(--text-muted);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
}

.plot {
  width: 100%;
  min-height: 460px;
}

/* ---- Tyre legend ------------------------------------------------------- */

.tyre-legend {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  margin: 4px 0 8px;
  padding: 0;
  font-size: 13px;
}

.tyre-legend li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.tyre-swatch {
  width: 18px;
  height: 12px;
  border-radius: 2px;
  border: 1px solid #999999;
}

.tyre-unknown {
  background: repeating-linear-gradient(135deg, #b0b0b0 0 1.5px, transparent 1.5px 5px);
}

.tyre-excluded {
  background: var(--chart-bg);
}

/* ---- Messages and status ----------------------------------------------- */

.message {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin: 12px 16px 0;
  padding: 10px 12px;
  border-radius: 6px;
  background: var(--info-bg);
  color: var(--info-text);
}

.message[data-kind="error"] {
  background: var(--error-bg);
  color: var(--error-text);
}

.message span {
  flex: 1;
}

.message-close {
  font: inherit;
  font-size: 18px;
  line-height: 1;
  background: none;
  border: 0;
  color: inherit;
  cursor: pointer;
  padding: 0 4px;
}

.status {
  position: fixed;
  left: 50%;
  bottom: 16px;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: calc(100vw - 32px);
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--text);
  color: var(--bg);
  font-size: 13px;
  box-shadow: 0 4px 14px rgb(0 0 0 / 0.2);
  z-index: 10;
}

.status span:last-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.spinner {
  flex: none;
  width: 14px;
  height: 14px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  .spinner {
    animation-duration: 2.4s;
  }
}

/* ---- Small screens ----------------------------------------------------- */

@media (max-width: 900px) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
    padding: 8px 16px 16px;
  }

  .app-header,
  .app-footer {
    padding-left: 16px;
    padding-right: 16px;
  }

  .sidebar {
    position: static;
    max-height: none;
  }

  .driver-list {
    max-height: 320px;
  }

  .panel {
    padding: 12px;
  }

  .message {
    margin: 12px 12px 0;
  }
}