/* Starfall Arena — layout, HUD and overlay screens.
   Two themes: dark (default) and a light variant for prefers-color-scheme: light. */

:root {
  color-scheme: dark;
  --bg: #05060d;
  --panel: rgba(9, 14, 28, 0.86);
  --panel-solid: #0b1224;
  --panel-border: rgba(78, 205, 255, 0.30);
  --text: #e9f5ff;
  --text-dim: #93b2ca;
  --accent: #35e8ff;
  --accent-2: #ff5aa8;
  --hp: #ff3d67;
  --xp: #49ffd2;
  --boss: #ff74ee;
  --focus: #ffe066;
  --shadow: 0 18px 60px rgba(0, 0, 0, 0.65);
  --hud-shadow: 0 2px 12px rgba(0, 0, 0, 0.8);
  --font-ui: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-num: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: light) {
  :root {
    color-scheme: light;
    --bg: #e7edf7;
    --panel: rgba(255, 255, 255, 0.92);
    --panel-solid: #ffffff;
    --panel-border: rgba(10, 90, 150, 0.28);
    --text: #0a1a2b;
    --text-dim: #4a6379;
    --accent: #0a7ba6;
    --accent-2: #bb1663;
    --hp: #cf1f45;
    --xp: #0d8570;
    --boss: #9c19a8;
    --focus: #8a5a00;
    --shadow: 0 18px 50px rgba(20, 45, 80, 0.25);
    --hud-shadow: 0 2px 10px rgba(255, 255, 255, 0.9);
  }
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  overflow: hidden;
  overscroll-behavior: none;
}

.app {
  position: fixed;
  inset: 0;
  display: block;
}

.arena {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
  cursor: crosshair;
}

/* ---------------------------------------------------------------- HUD --- */

.hud {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  font-variant-numeric: tabular-nums;
}

.hud-block {
  position: absolute;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 10px 14px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  box-shadow: var(--hud-shadow);
  min-width: 172px;
}

.hud-tl { top: 12px; left: 12px; }

.hud-top {
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  align-items: center;
  text-align: center;
  min-width: 230px;
}

.hud-bottom {
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  align-items: center;
  flex-direction: row;
  gap: 12px;
  min-width: 380px;
  max-width: min(620px, calc(100vw - 24px));
}

.stat-label {
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.stat-value {
  font-family: var(--font-num);
  font-size: 12px;
  color: var(--text);
}

.bar {
  position: relative;
  overflow: hidden;
  border-radius: 6px;
  background: rgba(128, 160, 200, 0.18);
  border: 1px solid var(--panel-border);
}

.bar-fill {
  display: block;
  height: 100%;
  width: 0%;
  border-radius: 5px;
  transition: width 90ms linear;
}

.bar-hp { height: 10px; width: 148px; }
.bar-hp .bar-fill { background: linear-gradient(90deg, var(--hp), #ff9d6b); }

.bar-xp { height: 10px; flex: 1 1 auto; min-width: 150px; }
.bar-xp .bar-fill { background: linear-gradient(90deg, var(--xp), var(--accent)); }

.bar-boss { height: 12px; width: 100%; }
.bar-boss .bar-fill { background: linear-gradient(90deg, var(--boss), #ffd166); }

.wave {
  font-family: var(--font-num);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--accent);
}

.timer {
  font-family: var(--font-num);
  font-size: 13px;
  color: var(--text-dim);
}

.milestone {
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

.level {
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 700;
  color: var(--xp);
  white-space: nowrap;
}

.boss {
  margin-top: 8px;
  width: 320px;
  max-width: 60vw;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

/* an explicit display value would otherwise defeat the [hidden] attribute */
.boss[hidden] { display: none; }

.boss-name {
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--boss);
}

.wave-banner {
  position: absolute;
  top: 26%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--font-num);
  font-size: clamp(18px, 3.4vw, 34px);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  text-shadow: 0 0 18px currentColor;
  opacity: 0;
  white-space: nowrap;
}

.wave-banner.show {
  animation: banner 2.4s ease-out forwards;
}

@media (prefers-color-scheme: light) {
  .wave-banner { text-shadow: 0 1px 0 rgba(255, 255, 255, 0.9); }
}

@keyframes banner {
  0% { opacity: 0; transform: translate(-50%, -50%) scale(0.86); }
  14% { opacity: 1; transform: translate(-50%, -50%) scale(1); }
  72% { opacity: 1; }
  100% { opacity: 0; transform: translate(-50%, -50%) scale(1.04); }
}

.hit-vignette {
  position: absolute;
  inset: 0;
  opacity: 0;
  pointer-events: none;
  background: radial-gradient(ellipse at center, rgba(255, 40, 80, 0) 45%, rgba(255, 40, 80, 0.5) 100%);
  transition: opacity 140ms ease-out;
}

.hit-vignette.show { opacity: 1; transition: opacity 40ms linear; }

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

.screens {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: block;
  pointer-events: none;
}

.screen {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: radial-gradient(ellipse at center, rgba(4, 8, 18, 0.72), rgba(3, 5, 12, 0.92));
  backdrop-filter: blur(3px);
  pointer-events: auto;
  overflow-y: auto;
}

@media (prefers-color-scheme: light) {
  .screen {
    background: radial-gradient(ellipse at center, rgba(232, 240, 250, 0.82), rgba(220, 230, 245, 0.95));
  }
}

.screen[hidden] { display: none; }

.panel {
  width: min(560px, 100%);
  padding: 26px 28px 24px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  text-align: center;
}

.panel-wide { width: min(880px, 100%); }

.title {
  margin: 0 0 8px;
  font-size: clamp(26px, 4vw, 40px);
  letter-spacing: 0.03em;
  color: var(--accent);
}

.title-bad { color: var(--hp); }
.title-good { color: var(--xp); }

.goal {
  margin: 0 0 10px;
  font-size: clamp(16px, 2.2vw, 20px);
  font-weight: 600;
  color: var(--text);
}

.sub {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-dim);
}

.controls {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  display: grid;
  gap: 7px;
  text-align: left;
}

.controls li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 13px;
  color: var(--text-dim);
  border-bottom: 1px dashed var(--panel-border);
  padding-bottom: 6px;
}

.controls .keys { flex: 0 0 auto; min-width: 178px; color: var(--text); }
.controls .what { flex: 1 1 auto; }

kbd {
  display: inline-block;
  min-width: 20px;
  padding: 1px 5px;
  margin-right: 2px;
  font-family: var(--font-num);
  font-size: 11px;
  color: var(--text);
  background: rgba(128, 170, 220, 0.16);
  border: 1px solid var(--panel-border);
  border-bottom-width: 2px;
  border-radius: 4px;
}

.best {
  margin: 0 0 14px;
  font-family: var(--font-num);
  font-size: 13px;
  color: var(--accent-2);
}

.btn {
  font: inherit;
  font-size: 15px;
  font-weight: 600;
  padding: 10px 26px;
  color: var(--text);
  background: rgba(128, 170, 220, 0.14);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  cursor: pointer;
}

.btn-primary {
  color: #04121c;
  background: linear-gradient(180deg, var(--accent), #14a6d8);
  border-color: transparent;
}

@media (prefers-color-scheme: light) {
  .btn-primary { color: #ffffff; background: linear-gradient(180deg, #0f93c4, #0a6b91); }
}

.btn:hover { filter: brightness(1.08); }

.hint {
  margin: 12px 0 0;
  font-size: 12px;
  color: var(--text-dim);
}

/* -------------------------------------------------------------- cards --- */

.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 6px;
}

@media (max-width: 720px) {
  .cards { grid-template-columns: 1fr; }
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-align: left;
  font: inherit;
  padding: 16px 16px 14px;
  color: var(--text);
  background: rgba(128, 170, 220, 0.10);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  cursor: pointer;
}

.card:hover,
.card:focus-visible {
  border-color: var(--accent);
  background: rgba(53, 232, 255, 0.14);
}

.card-key {
  position: absolute;
  top: 10px;
  right: 12px;
  font-family: var(--font-num);
  font-size: 12px;
  color: var(--accent);
  border: 1px solid var(--panel-border);
  border-radius: 5px;
  padding: 0 6px;
}

.card-name {
  font-size: 16px;
  font-weight: 700;
  padding-right: 26px;
}

.card-blurb { font-size: 13px; color: var(--text-dim); line-height: 1.4; }

.card-delta {
  font-family: var(--font-num);
  font-size: 12px;
  color: var(--xp);
}

.card-rank {
  font-family: var(--font-num);
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.08em;
}

/* ------------------------------------------------------------ results --- */

.results {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 16px;
  margin: 0 0 18px;
  text-align: left;
}

.results div {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 6px 10px;
  background: rgba(128, 170, 220, 0.10);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
}

.results dt { font-size: 12px; color: var(--text-dim); }
.results dd {
  margin: 0;
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
}

/* --------------------------------------------------------------- a11y --- */

.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;
}

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

@media (prefers-reduced-motion: reduce) {
  .wave-banner.show { animation-duration: 1.6s; }
  .bar-fill { transition: none; }
  .hit-vignette { transition: none; }
  .btn:hover { filter: none; }
}