/*
 * Four in a Row: dark theme, mobile first.
 * Phones: one column. From 860px wide: board plus a side panel. Short landscape
 * screens: board on the left, controls on the right.
 * The board is an SVG whose viewBox is 728 x 736 user units (see src/board-view.js);
 * the top 108 units are the lane where the next disc hovers, the rest is the frame.
 */

:root {
  color-scheme: dark;
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-hover: #273449;
  --surface-sunken: #0b1222;
  --border: rgba(148, 163, 184, 0.16);
  --border-strong: rgba(148, 163, 184, 0.28);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #f43f5e;
  /* Darker accent shades keep white button text above 4.5:1 contrast. */
  --accent-strong: #e11d48;
  --accent-deep: #be123c;
  --p1: #f43f5e;
  --p2: #2dd4bf;
  --radius: 12px;
  --shadow: 0 12px 32px -14px rgba(2, 6, 23, 0.7), 0 2px 6px rgba(2, 6, 23, 0.3);
  --shadow-sm: 0 1px 2px rgba(2, 6, 23, 0.45);
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --gutter: 16px;
  --gap: 8px;
  /* Height of everything around the board in the current layout; the board shrinks on short screens. */
  --chrome-h: 284px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.4;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

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

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  background: radial-gradient(1100px 520px at 50% -200px, rgba(244, 63, 94, 0.1), transparent 70%) no-repeat, var(--bg);
  color: var(--text);
}

.container {
  width: 100%;
  max-width: 904px;
  margin-inline: auto;
  padding-left: max(var(--gutter), env(safe-area-inset-left));
  padding-right: max(var(--gutter), env(safe-area-inset-right));
}

/* Set until the first state is drawn, so the page does not animate into it on load. */
.is-starting *,
.is-starting *::before,
.is-starting *::after {
  transition: none !important;
}

.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;
}

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

.topbar {
  padding-top: env(safe-area-inset-top);
  border-bottom: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.72);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 56px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.brand-mark {
  width: 28px;
  height: 28px;
  flex: none;
}

.brand-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar-actions {
  display: flex;
  gap: 8px;
  flex: none;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 40px;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.2;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition:
    background-color 150ms var(--ease),
    border-color 150ms var(--ease),
    transform 150ms var(--ease),
    opacity 150ms var(--ease);
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

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

.btn:disabled {
  opacity: 0.4;
  cursor: default;
}

.btn-primary {
  border-color: transparent;
  background: var(--accent-strong);
  color: #fff;
  box-shadow: 0 6px 18px -8px rgba(244, 63, 94, 0.7);
}

.btn-primary.is-attention {
  animation: attention 1.8s ease-out infinite;
}

.btn-square {
  width: 40px;
  padding: 0;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
}

@media (hover: hover) {
  .btn:hover:not(:disabled) {
    background: var(--surface-hover);
  }

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

.icon {
  width: 18px;
  height: 18px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

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

.layout {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--gap);
  padding-top: 8px;
  padding-bottom: 8px;
}

.stage {
  display: flex;
  flex-direction: column;
  gap: var(--gap);
  /* Fits the board to the screen height (0.989 = 728 / 736, its width per unit of height),
     but never below 296px, where each column is still a 40px tap target (296 / 7.28);
     short screens scroll a little instead. */
  width: min(100%, 560px, max(296px, calc((100vh - var(--chrome-h)) * 0.989)));
  width: min(100%, 560px, max(296px, calc((100svh - var(--chrome-h)) * 0.989)));
  margin-inline: auto;
}

/* ---------- Score ---------- */

.scoreboard {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
  /* The cards tighten up when the scoreboard itself is narrow, see @container below. */
  container-type: inline-size;
}

.score-card {
  --tone: var(--p1);
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  min-height: 48px;
  padding: 0 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  transition:
    border-color 200ms var(--ease),
    box-shadow 200ms var(--ease);
}

.score-card.p2 {
  --tone: var(--p2);
}

.score-card.is-active {
  border-color: color-mix(in srgb, var(--tone) 70%, transparent);
  box-shadow:
    0 0 0 1px color-mix(in srgb, var(--tone) 35%, transparent),
    0 8px 22px -12px color-mix(in srgb, var(--tone) 80%, transparent);
}

.chip {
  width: 16px;
  height: 16px;
  flex: none;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #ffe4e6, #fb7185 30%, #e11d48 75%, #9f1239);
}

.p2 .chip {
  background: radial-gradient(circle at 35% 30%, #ccfbf1, #5eead4 30%, #14b8a6 75%, #115e59);
}

.score-card.is-thinking .chip {
  animation: thinking 0.9s ease-in-out infinite;
}

.score-name {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  color: var(--muted);
  font-size: 0.9375rem;
  font-weight: 600;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: color 200ms var(--ease);
}

.score-card.is-active .score-name {
  color: var(--text);
}

.score-value {
  font-size: 1.5rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

/* Narrow scoreboard (small or short phones, small windows): tighter cards so the names fit. */
@container (max-width: 340px) {
  .score-card {
    gap: 8px;
    padding: 0 10px;
  }

  .score-name {
    font-size: 0.875rem;
  }
}

/* ---------- Status ---------- */

.statusbar {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
}

.status {
  display: flex;
  flex: 1;
  align-items: center;
  gap: 10px;
  min-width: 0;
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

.status-dot {
  width: 10px;
  height: 10px;
  flex: none;
  border-radius: 50%;
  background: var(--muted);
  transition: background-color 200ms var(--ease);
}

.status[data-tone="1"] .status-dot {
  background: var(--p1);
}

.status[data-tone="2"] .status-dot {
  background: var(--p2);
}

.status.is-over .status-text {
  font-weight: 800;
}

/* ---------- Board ---------- */

.board-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 728 / 736;
  border-radius: var(--radius);
  outline: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

/* Shadow and focus ring around the frame only, not the lane above it. */
.board-wrap::before {
  content: "";
  position: absolute;
  inset: 14.674% 0 0;
  border-radius: 3.571% / 4.14%;
  box-shadow:
    0 0 0 1px rgba(148, 163, 184, 0.14),
    0 28px 50px -22px rgba(2, 6, 23, 0.95),
    0 10px 24px -12px rgba(2, 6, 23, 0.7);
  transition: box-shadow 150ms var(--ease);
}

.board-wrap:focus-visible::before {
  box-shadow:
    0 0 0 3px var(--bg),
    0 0 0 5px var(--accent),
    0 28px 50px -22px rgba(2, 6, 23, 0.95);
}

.board-svg {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  cursor: pointer;
  touch-action: none;
}

.board-svg .holes circle {
  fill: url(#fiar-hole);
}

.board-svg .frame {
  fill: url(#fiar-frame);
}

.board-svg .rims circle {
  fill: none;
  stroke: rgba(2, 6, 23, 0.55);
  stroke-width: 4;
}

.column-highlight {
  fill: rgba(226, 232, 240, 0.07);
  transition:
    transform 160ms var(--ease),
    opacity 160ms var(--ease);
}

.column-flash {
  fill: rgba(244, 63, 94, 0.35);
  opacity: 0;
}

.ghost {
  fill: none;
  stroke-width: 4;
  stroke-dasharray: 7 7;
  transition:
    transform 160ms var(--ease),
    opacity 160ms var(--ease);
}

.ghost.p1 {
  stroke: var(--p1);
}

.ghost.p2 {
  stroke: var(--p2);
}

.preview {
  opacity: 0.95;
  transition:
    transform 160ms var(--ease),
    opacity 160ms var(--ease);
}

.board-svg .is-hidden {
  opacity: 0;
}

.disc.p1 .disc-face {
  fill: url(#fiar-p1);
}

.disc.p2 .disc-face {
  fill: url(#fiar-p2);
}

.disc-ring {
  fill: none;
  stroke: rgba(255, 255, 255, 0.24);
  stroke-width: 3;
}

.disc-mark {
  fill: #fff;
  opacity: 0;
  transition: opacity 200ms var(--ease);
}

.disc.is-last .disc-mark {
  opacity: 0.9;
}

.disc-body {
  transition: opacity 250ms var(--ease);
}

.disc-drop.is-dropping {
  animation: disc-drop var(--duration, 400ms) linear both;
}

.disc.is-win .disc-body {
  transform-box: fill-box;
  transform-origin: center;
  animation: win-pulse 1.2s ease-in-out var(--win-delay, 0ms) infinite;
}

.disc.is-win .disc-ring {
  stroke: rgba(255, 255, 255, 0.9);
  stroke-width: 4;
}

.board-svg.is-won .disc:not(.is-win) .disc-body {
  opacity: 0.4;
  transition-delay: var(--win-delay, 0ms);
}

/* ---------- Settings ---------- */

.settings-toggle {
  justify-content: flex-start;
  gap: 10px;
  width: 100%;
  min-height: 44px;
  padding: 10px 14px;
  text-align: left;
}

.settings-summary {
  flex: 1;
  min-width: 0;
  font-size: 0.875rem;
}

.settings-toggle .chevron {
  transition: transform 200ms var(--ease);
}

.settings-toggle[aria-expanded="true"] .chevron {
  transform: rotate(180deg);
}

.panel {
  display: grid;
  align-content: start;
  gap: 14px;
  width: min(100%, 560px);
  margin-inline: auto;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  animation: panel-in 200ms var(--ease);
}

.panel.is-collapsed {
  display: none;
}

.panel-title {
  margin: 0;
  font-size: 0.9375rem;
  font-weight: 700;
}

.settings {
  display: grid;
  gap: 12px;
}

.group {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.group-label {
  margin-bottom: 4px;
  padding: 0;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.segmented {
  display: flex;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-sunken);
}

.segment {
  position: relative;
  flex: 1 1 0;
  min-width: 0;
}

.segment input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.segment span {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 4px 6px;
  border-radius: 9px;
  color: var(--muted);
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.2;
  text-align: center;
  transition:
    background-color 150ms var(--ease),
    color 150ms var(--ease),
    box-shadow 150ms var(--ease);
}

.segment input:checked + span {
  background: color-mix(in srgb, var(--accent) 16%, var(--surface-hover));
  color: #fff;
  box-shadow:
    inset 0 0 0 1px color-mix(in srgb, var(--accent) 50%, transparent),
    0 2px 6px -2px rgba(2, 6, 23, 0.6);
}

.segment input:focus-visible + span {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.group:disabled .group-label,
.group:disabled .segment span {
  opacity: 0.45;
}

.group:disabled .segment input {
  cursor: default;
}

@media (hover: hover) {
  .group:not(:disabled) .segment input:not(:checked):hover + span {
    color: var(--text);
  }
}

/* ---------- How to play ---------- */

.how {
  display: grid;
  gap: 8px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.8125rem;
}

.how p {
  margin: 0;
  line-height: 1.45;
}

.keys-title {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.keys {
  display: grid;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.keys li {
  display: flex;
  align-items: center;
  gap: 10px;
}

.keycaps {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  min-width: 76px;
}

kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 24px;
  padding: 0 6px;
  border: 1px solid var(--border-strong);
  border-bottom-width: 2px;
  border-radius: 6px;
  background: var(--surface-sunken);
  color: var(--text);
  font: 600 0.75rem/1 ui-monospace, "SFMono-Regular", "Cascadia Mono", Consolas, monospace;
}

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

.footer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding-top: 4px;
  padding-bottom: calc(8px + env(safe-area-inset-bottom));
  color: var(--muted);
  font-size: 0.8125rem;
}

.footer a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  border-radius: 6px;
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: rgba(226, 232, 240, 0.35);
  text-underline-offset: 3px;
  transition: text-decoration-color 150ms var(--ease);
}

.footer a:hover {
  text-decoration-color: var(--accent);
}

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

/* ---------- Animations ---------- */

/* Falls with gravity from the lane, lands, bounces once. --from is negative (above the cell). */
@keyframes disc-drop {
  0% {
    transform: translateY(var(--from));
    animation-timing-function: cubic-bezier(0.55, 0, 1, 0.45);
  }

  70% {
    transform: translateY(0);
    animation-timing-function: cubic-bezier(0.2, 0.6, 0.35, 1);
  }

  85% {
    transform: translateY(-12px);
    animation-timing-function: cubic-bezier(0.55, 0, 1, 0.45);
  }

  100% {
    transform: translateY(0);
  }
}

@keyframes win-pulse {
  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(0.84);
  }
}

@keyframes thinking {
  50% {
    transform: scale(0.65);
    opacity: 0.55;
  }
}

@keyframes attention {
  0% {
    box-shadow: 0 0 0 0 rgba(244, 63, 94, 0.55);
  }

  70%,
  100% {
    box-shadow: 0 0 0 10px rgba(244, 63, 94, 0);
  }
}

@keyframes panel-in {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
}

/* ---------- Narrow phones ---------- */

@media (max-width: 360px) {
  :root {
    --gutter: 12px;
    /* The settings summary often wraps to two lines here. */
    --chrome-h: 300px;
  }

  .btn-compact {
    width: 40px;
    padding: 0;
  }

  .btn-compact .btn-label {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
  }
}

/* ---------- Wide screens: board and side panel ---------- */

@media (min-width: 860px) and (min-height: 541px) {
  :root {
    --gap: 12px;
    --chrome-h: 280px;
  }

  .topbar-inner {
    min-height: 64px;
  }

  .brand {
    font-size: 1.1875rem;
  }

  .brand-mark {
    width: 32px;
    height: 32px;
  }

  .layout {
    display: grid;
    grid-template-columns: min(540px, max(296px, calc((100vh - var(--chrome-h)) * 0.989)), calc(100% - 332px)) 300px;
    grid-template-columns: min(540px, max(296px, calc((100svh - var(--chrome-h)) * 0.989)), calc(100% - 332px)) 300px;
    justify-content: center;
    align-items: start;
    gap: 32px;
    padding-top: 24px;
    padding-bottom: 16px;
  }

  .stage {
    width: auto;
    margin: 0;
  }

  .settings-toggle {
    display: none;
  }

  .panel,
  .panel.is-collapsed {
    display: grid;
    width: auto;
    margin: 0;
  }
}

/* ---------- Short landscape screens: board left, controls right ---------- */

@media (orientation: landscape) and (max-height: 540px) {
  .topbar-inner {
    min-height: 48px;
  }

  .layout {
    /* Never below 292px, so each column stays a 40px tap target (292 / 7.28); very short screens scroll a little. */
    --board-w: max(292px, calc((100vh - 72px) * 0.989));
    display: grid;
    grid-template-columns: var(--board-w) minmax(0, 420px);
    grid-template-rows: auto auto auto 1fr;
    grid-template-areas:
      "board score"
      "board status"
      "board toggle"
      "board panel";
    justify-content: center;
    align-items: start;
    gap: 8px 20px;
  }

  @supports (height: 100svh) {
    .layout {
      --board-w: max(292px, calc((100svh - 72px) * 0.989));
    }
  }

  .stage {
    display: contents;
  }

  .scoreboard {
    grid-area: score;
  }

  .statusbar {
    grid-area: status;
  }

  .board-wrap {
    grid-area: board;
  }

  .settings-toggle {
    grid-area: toggle;
  }

  .panel {
    grid-area: panel;
    width: auto;
    margin: 0;
  }
}

/* ---------- Reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-delay: 0ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
    transition-delay: 0ms !important;
    scroll-behavior: auto !important;
  }
}