/*
 * styles.css — Layout, chrome and screens.
 *
 * The game is portrait-first. The whole app fits one viewport height with no
 * page scrolling: HUD and controls take their natural height, the stage takes
 * whatever is left, and the canvas is sized to the stage by a ResizeObserver.
 * Safe-area insets are honoured so nothing hides behind a notch or a home bar.
 */

:root {
  --bg: #05070d;
  --panel: #0b1020;
  --panel-2: #0e1526;
  --panel-deep: #070b16;
  --line: rgba(120, 160, 210, 0.16);
  --cyan: #3ef2f0;
  --violet: #b06cff;
  --warning: #ff9a3c;
  --hostile: #ff5a4d;
  --white: #f2f7ff;
  --text: #9fb3d1;
  --text-dim: #64789a;
  --radius: 14px;
  --font: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior: none;
}

body {
  /* Stop iOS rubber-banding and text selection from fighting the swipe input. */
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

#app {
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  max-width: 520px;
  margin: 0 auto;
  padding: var(--safe-top) var(--safe-right) var(--safe-bottom) var(--safe-left);
}

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

#hud {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas: "pause title" "pause readout";
  align-items: center;
  gap: 2px 10px;
  padding: 8px 12px 6px;
  flex: 0 0 auto;
}

#hud[hidden] { display: none; }

.hud-title {
  grid-area: title;
  display: flex;
  align-items: baseline;
  gap: 8px;
  min-width: 0;
}

#hudLevelNum {
  color: var(--cyan);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

#hudLevelName {
  color: var(--white);
  font-size: 12px;
  letter-spacing: 0.14em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.hud-readout {
  grid-area: readout;
  display: flex;
  gap: 14px;
  margin: 0;
}

.hud-readout div { display: flex; align-items: baseline; gap: 5px; }
.hud-readout dt {
  font-size: 9px;
  letter-spacing: 0.12em;
  color: var(--text-dim);
}
.hud-readout dd {
  margin: 0;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--text);
}

#pauseBtn { grid-area: pause; }

.icon-btn {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(15, 24, 44, 0.75);
  color: var(--text);
  cursor: pointer;
  padding: 0;
}
.icon-btn svg { width: 20px; height: 20px; fill: currentColor; }
.icon-btn:active { transform: scale(0.94); }

/* ---------------- Stage ---------------- */

#stage {
  position: relative;
  flex: 1 1 auto;
  min-height: 0;
  display: block;
  touch-action: none;
}

#game {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
}

#toast {
  position: absolute;
  left: 50%;
  top: 12px;
  transform: translate(-50%, -12px);
  margin: 0;
  padding: 7px 14px;
  border-radius: 999px;
  background: rgba(8, 14, 28, 0.9);
  border: 1px solid var(--line);
  color: var(--white);
  font-size: 11px;
  letter-spacing: 0.12em;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}
#toast.show { opacity: 1; transform: translate(-50%, 0); }

.tutorial-card {
  position: absolute;
  left: 50%;
  bottom: 8%;
  transform: translateX(-50%);
  width: min(90%, 340px);
  padding: 16px;
  border-radius: var(--radius);
  background: rgba(9, 15, 30, 0.95);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 30px rgba(62, 242, 240, 0.18);
  text-align: center;
}
.tutorial-card[hidden] { display: none; }
.tutorial-card p {
  margin: 0 0 12px;
  color: var(--white);
  font-size: 12.5px;
  line-height: 1.65;
  letter-spacing: 0.08em;
  white-space: pre-line;
}

/* ---------------- Controls ---------------- */

#controls {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 12px 12px;
}
#controls[hidden] { display: none; }

.control-left { display: flex; align-items: center; gap: 10px; }

.control-hint {
  margin: 0;
  font-size: 9px;
  line-height: 1.5;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

/* Large, thumb-reachable, and never over the board. */
.polarity-btn {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 132px;
  min-height: 62px;
  padding: 10px 16px 10px 12px;
  border-radius: 18px;
  border: 1px solid currentColor;
  background: rgba(10, 18, 34, 0.9);
  cursor: pointer;
  overflow: hidden;
  transition: color 0.18s ease, box-shadow 0.18s ease;
}
.polarity-btn.is-cyan { color: var(--cyan); box-shadow: 0 0 22px rgba(62, 242, 240, 0.2); }
.polarity-btn.is-violet { color: var(--violet); box-shadow: 0 0 22px rgba(176, 108, 255, 0.22); }
.polarity-btn:active { transform: scale(0.97); }

.polarity-glyph {
  width: 26px;
  height: 26px;
  border: 3px solid currentColor;
  flex: 0 0 auto;
}
/* Shape, not just colour: circle = cyan, diamond = violet. */
.is-cyan .polarity-glyph { border-radius: 50%; }
.is-violet .polarity-glyph { border-radius: 3px; transform: rotate(45deg) scale(0.82); }

.polarity-label { display: flex; flex-direction: column; align-items: flex-start; line-height: 1.25; }
.polarity-label em {
  font-style: normal;
  font-size: 8.5px;
  letter-spacing: 0.16em;
  color: var(--text-dim);
}
.polarity-label b { font-size: 13px; letter-spacing: 0.12em; color: currentColor; }

.polarity-cooldown {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 3px;
  width: 100%;
  background: currentColor;
  transform-origin: left center;
  transform: scaleX(0);
  opacity: 0.85;
}

/* ---------------- Screens ---------------- */

.screen {
  position: absolute;
  inset: 0;
  z-index: 20;
  display: grid;
  padding: calc(var(--safe-top) + 10px) 16px calc(var(--safe-bottom) + 14px);
  background: linear-gradient(180deg, rgba(5, 7, 13, 0.97), rgba(5, 7, 13, 0.99));
  backdrop-filter: blur(6px);
  overflow-y: auto;
  overscroll-behavior: contain;
  animation: screen-in 0.22s ease;
}
.screen[hidden] { display: none; }

@keyframes screen-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

.screen-inner { width: 100%; max-width: 460px; margin: auto; }
.screen-inner.narrow { max-width: 360px; }

.screen-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}
.screen-head h2 { margin: 0; }

h2 {
  font-size: 16px;
  letter-spacing: 0.2em;
  color: var(--white);
  font-weight: 600;
  margin: 0 0 14px;
}

.eyebrow {
  margin: 0 0 4px;
  font-size: 10px;
  letter-spacing: 0.3em;
  color: var(--cyan);
}

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

.section-label {
  margin: 26px 0 10px;
  font-size: 10px;
  letter-spacing: 0.24em;
  color: var(--text-dim);
  font-weight: 600;
}

/* Menu */
.menu { text-align: center; }

.logo { margin-bottom: 30px; }

.logo-mark {
  display: block;
  width: 54px;
  height: 54px;
  margin: 0 auto 16px;
  background: linear-gradient(140deg, var(--cyan), var(--violet));
  transform: rotate(45deg);
  border-radius: 10px;
  box-shadow: 0 0 40px rgba(62, 242, 240, 0.35);
}

.logo h1 {
  margin: 0;
  font-size: clamp(28px, 9vw, 40px);
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--white);
  line-height: 1;
}
.logo h1 span { display: block; color: var(--cyan); }

.tagline {
  margin: 12px 0 0;
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--text-dim);
}

.menu-actions { display: flex; flex-direction: column; gap: 10px; margin: 0 auto; }
.btn-row { display: flex; gap: 10px; }
.btn-row .btn { flex: 1; }

.btn {
  padding: 14px 18px;
  min-height: 48px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(14, 22, 42, 0.9);
  color: var(--text);
  font-family: var(--font);
  font-size: 12px;
  letter-spacing: 0.16em;
  cursor: pointer;
  transition: border-color 0.16s ease, color 0.16s ease, background 0.16s ease;
}
.btn:hover { border-color: rgba(62, 242, 240, 0.5); color: var(--white); }
.btn:active { transform: scale(0.98); }

.btn-primary {
  background: linear-gradient(120deg, rgba(62, 242, 240, 0.2), rgba(176, 108, 255, 0.2));
  border-color: var(--cyan);
  color: var(--white);
}
.btn-ghost { background: transparent; font-size: 11px; min-height: 42px; }
.btn-danger { border-color: rgba(255, 90, 77, 0.5); color: var(--hostile); background: transparent; }
.btn-small { padding: 8px 14px; min-height: 36px; font-size: 10.5px; }

.btn:disabled { opacity: 0.35; cursor: not-allowed; }

.menu-summary {
  display: flex;
  justify-content: center;
  gap: 22px;
  margin: 26px 0 0;
}
.menu-summary dt { font-size: 8.5px; letter-spacing: 0.14em; color: var(--text-dim); }
.menu-summary dd { margin: 3px 0 0; font-size: 14px; color: var(--white); font-variant-numeric: tabular-nums; }

.footnote {
  margin: 22px 0 0;
  font-size: 9px;
  letter-spacing: 0.14em;
  color: var(--text-dim);
  text-align: center;
}

/* Level select */
.level-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }

.level-item {
  display: grid;
  grid-template-columns: 34px 1fr auto;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(12, 20, 38, 0.8);
  color: var(--text);
  font-family: var(--font);
  text-align: left;
  cursor: pointer;
}
.level-item:hover:not(:disabled) { border-color: rgba(62, 242, 240, 0.45); }
.level-item:disabled { opacity: 0.4; cursor: not-allowed; }
.level-item .num { font-size: 15px; color: var(--cyan); font-weight: 700; }
.level-item.locked .num { color: var(--text-dim); }
.level-item .name { font-size: 12px; letter-spacing: 0.12em; color: var(--white); }
.level-item .meta { font-size: 9px; letter-spacing: 0.08em; color: var(--text-dim); margin-top: 3px; }
.level-item .badges { display: flex; gap: 4px; }

.badge {
  width: 14px;
  height: 14px;
  border-radius: 4px;
  border: 1px solid var(--text-dim);
  display: block;
}
.badge.earned.b-connected { background: var(--cyan); border-color: var(--cyan); }
.badge.earned.b-clean { background: var(--violet); border-color: var(--violet); }
.badge.earned.b-latency { background: var(--warning); border-color: var(--warning); }

/* Level complete */
.badge-row {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 10px;
  margin: 18px 0;
  padding: 0;
}
.badge-row li {
  flex: 1;
  max-width: 96px;
  padding: 10px 6px;
  border-radius: 10px;
  border: 1px solid var(--line);
  text-align: center;
  font-size: 8.5px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}
.badge-row li .badge { margin: 0 auto 6px; width: 18px; height: 18px; }
.badge-row li.earned { color: var(--white); border-color: currentColor; }

.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 0 0 20px;
}
.result-grid div {
  padding: 10px 12px;
  border-radius: 10px;
  background: rgba(12, 20, 38, 0.75);
  border: 1px solid var(--line);
}
.result-grid .wide { grid-column: span 2; }
.result-grid dt { font-size: 8.5px; letter-spacing: 0.14em; color: var(--text-dim); }
.result-grid dd { margin: 4px 0 0; font-size: 15px; color: var(--white); font-variant-numeric: tabular-nums; }
.result-grid .highlight dd { color: var(--cyan); }

/* Settings */
.settings-list { list-style: none; margin: 0 0 22px; padding: 0; display: flex; flex-direction: column; gap: 4px; }
.settings-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 4px;
  border-bottom: 1px solid var(--line);
}
.settings-list label { font-size: 12px; letter-spacing: 0.08em; color: var(--white); }
.settings-list label em {
  display: block;
  margin-top: 4px;
  font-style: normal;
  font-size: 9.5px;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

.toggle {
  flex: 0 0 auto;
  width: 50px;
  height: 28px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(10, 16, 30, 0.9);
  position: relative;
  cursor: pointer;
  padding: 0;
}
.toggle span {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--text-dim);
  transition: transform 0.18s ease, background 0.18s ease;
}
.toggle[aria-checked="true"] { border-color: var(--cyan); }
.toggle[aria-checked="true"] span { transform: translateX(22px); background: var(--cyan); }

/* Help */
.help-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 16px; }
.help-list li { display: flex; gap: 14px; align-items: flex-start; }
.help-list h3 { margin: 0 0 4px; font-size: 11.5px; letter-spacing: 0.12em; color: var(--white); font-weight: 600; }
.help-list p { margin: 0; font-size: 11px; line-height: 1.65; color: var(--text); }

.help-icon {
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: rgba(12, 20, 38, 0.8);
  position: relative;
}
.help-icon::after {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
}
.icon-move::after { width: 14px; height: 14px; background: var(--cyan); transform: rotate(45deg); border-radius: 3px; }
.icon-packet::after { width: 22px; height: 12px; background: var(--hostile); border-radius: 3px; }
.icon-platform::after { width: 24px; height: 8px; background: linear-gradient(180deg, var(--cyan) 0 3px, #16293f 3px); border-radius: 2px; }
.icon-polarity::after { width: 16px; height: 16px; background: linear-gradient(90deg, var(--cyan) 50%, var(--violet) 50%); border-radius: 50%; }
.icon-scanner::after { width: 24px; height: 4px; background: var(--warning); box-shadow: 0 0 10px var(--warning); }
.icon-uplink::after { width: 16px; height: 16px; border: 3px solid var(--white); border-radius: 4px; }

.key-table { width: 100%; border-collapse: collapse; font-size: 10.5px; }
.key-table th {
  text-align: left;
  padding: 9px 10px 9px 0;
  color: var(--cyan);
  letter-spacing: 0.1em;
  font-weight: 600;
  white-space: nowrap;
  vertical-align: top;
  width: 78px;
}
.key-table td { padding: 9px 0; color: var(--text); border-bottom: 1px solid var(--line); line-height: 1.6; }
.key-table tr:last-child td, .key-table tr:last-child th { border-bottom: 0; }

.badge-legend { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.badge-legend li { display: flex; align-items: center; gap: 12px; font-size: 10.5px; line-height: 1.6; }
.badge-legend .badge { width: 16px; height: 16px; flex: 0 0 auto; }
.badge-legend b { color: var(--white); }

/* Update banner */
.update-banner {
  position: absolute;
  left: 50%;
  bottom: calc(var(--safe-bottom) + 14px);
  transform: translateX(-50%);
  z-index: 60;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: 12px;
  background: rgba(10, 18, 34, 0.96);
  border: 1px solid var(--cyan);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--white);
}
.update-banner[hidden] { display: none; }

/* ---------------- Accessibility ---------------- */

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

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* Very small phones: reclaim vertical space from the chrome, never the board. */
@media (max-height: 640px) {
  #hud { padding: 5px 10px 3px; }
  .hud-readout { gap: 10px; }
  #controls { padding: 5px 10px 8px; }
  .polarity-btn { min-height: 54px; min-width: 118px; }
  .control-hint { display: none; }
}

@media (max-width: 340px) {
  .hud-readout div:nth-child(4) { display: none; }
  .polarity-btn { min-width: 104px; padding: 8px 12px; }
}

/* Desktop: a restrained console frame rather than a stretched board. */
@media (min-width: 720px) and (min-height: 700px) {
  body {
    background:
      radial-gradient(900px 600px at 50% -10%, rgba(62, 242, 240, 0.07), transparent 70%),
      var(--bg);
  }
  #app {
    max-width: 460px;
    height: min(100dvh, 900px);
    margin-top: max(0px, calc((100dvh - 900px) / 2));
    border: 1px solid var(--line);
    border-radius: 22px;
    background: rgba(7, 11, 22, 0.7);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6);
    overflow: hidden;
  }
}