/* SkyHand: page chrome. The in-flight display is drawn by hud.js. */

:root {
  --ink: #0e1a24;
  --ink-glass: rgba(14, 26, 36, 0.8);
  --cloud: #f2f6f9;
  --dim: rgba(242, 246, 249, 0.7);
  --faint: rgba(242, 246, 249, 0.42);
  --line: rgba(255, 255, 255, 0.14);
  --signal: #ff7a1a;
  --lichen: #8fd694;
  --amber: #ffc845;
  --alert: #ff5a4f;
  --text: "Barlow", "Segoe UI", system-ui, sans-serif;
  --display: "Barlow Condensed", "Arial Narrow", sans-serif;
}

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

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  background: #c7d9e9;
  color: var(--cloud);
  font-family: var(--text);
  -webkit-font-smoothing: antialiased;
}

main canvas {
  display: block;
}

#hud {
  position: fixed;
  inset: 0;
  z-index: 5;
  touch-action: none;
}

.hidden {
  display: none !important;
}


/* ---------- start screen ---------- */

#start {
  position: fixed;
  inset: 0;
  z-index: 10;
  overflow-y: auto;
  padding: clamp(16px, 4vh, 48px) clamp(16px, 4vw, 56px);
  background: linear-gradient(90deg,
    rgba(14, 26, 36, 0.9) 0%,
    rgba(14, 26, 36, 0.62) 42%,
    rgba(14, 26, 36, 0.05) 80%);
}

.start-inner {
  min-height: 100%;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  align-content: center;
  gap: 20px;
}

.card {
  width: min(410px, 100%);
  padding: 26px 28px;
  border-radius: 18px;
  background: var(--ink-glass);
  border: 1px solid var(--line);
  backdrop-filter: blur(6px);
}

.card.gestures {
  width: min(350px, 100%);
  padding: 22px 24px;
}

h1 {
  margin: 0;
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(56px, 8vw, 88px);
  line-height: 0.9;
  letter-spacing: -0.01em;
}

.lede {
  margin: 12px 0 22px;
  max-width: 34ch;
  font-size: 17px;
  line-height: 1.45;
  color: var(--dim);
}

h2 {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 600;
}

h3 {
  margin: 20px 0 6px;
  font-size: 14px;
  font-weight: 700;
}


/* ---------- pre-flight checklist ---------- */

.checklist {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  counter-reset: step;
}

.checklist li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 12px;
  align-items: start;
  padding: 10px 0;
  border-top: 1px solid var(--line);
}

.checklist li:last-child {
  border-bottom: 1px solid var(--line);
}

.mark {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  border: 2px solid var(--faint);
  font: 700 13px/1 var(--display);
  color: var(--dim);
}

.mark::before {
  content: counter(step);
}

li[data-state="wait"] .mark {
  border-color: var(--amber);
  color: var(--amber);
  animation: pulse 1.6s ease-in-out infinite;
}

li[data-state="done"] .mark {
  border-color: var(--lichen);
  background: var(--lichen);
  color: var(--ink);
}

li[data-state="done"] .mark::before {
  content: "\2713";
}

li[data-state="fail"] .mark {
  border-color: var(--alert);
  color: var(--alert);
}

li[data-state="fail"] .mark::before {
  content: "!";
}

.item b {
  display: block;
  font-size: 15px;
  font-weight: 600;
}

.note {
  display: block;
  margin-top: 2px;
  font-size: 13.5px;
  line-height: 1.4;
  color: var(--dim);
}

@keyframes pulse {
  50% {
    box-shadow: 0 0 0 5px rgba(255, 200, 69, 0.18);
  }
}


/* ---------- buttons ---------- */

#start-button {
  display: block;
  width: 100%;
  padding: 15px 20px;
  border: 0;
  border-radius: 12px;
  background: var(--signal);
  color: var(--ink);
  font: 700 19px/1 var(--text);
  cursor: pointer;
  transition: transform 0.12s ease, filter 0.12s ease;
}

#start-button:hover {
  filter: brightness(1.07);
}

#start-button:active {
  transform: translateY(1px);
}

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

.fine {
  margin: 12px 0 0;
  max-width: 60ch;
  font-size: 13px;
  line-height: 1.45;
  color: var(--faint);
}


/* ---------- gesture and key lists ---------- */

dl {
  margin: 0;
}

dl > div {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  padding: 8px 0;
  border-top: 1px solid var(--line);
}

dt {
  font-size: 14.5px;
  font-weight: 600;
}

dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.35;
  color: var(--dim);
}

.keys > div {
  grid-template-columns: 110px 1fr;
}

.keys dt {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

kbd {
  min-width: 26px;
  padding: 3px 7px;
  border: 1px solid var(--faint);
  border-bottom-width: 2px;
  border-radius: 6px;
  font: 600 13px/1.2 var(--display);
  text-align: center;
  color: var(--cloud);
}


/* ---------- help dialog ---------- */

#help {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 20px;
  overflow-y: auto;
  background: rgba(14, 26, 36, 0.55);
}

.card.wide {
  position: relative;
  width: min(860px, 100%);
}

.cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

#help-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--cloud);
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
}


/* ---------- small screens + reduced motion ---------- */

@media (max-width: 760px) {
  #start {
    background: rgba(14, 26, 36, 0.78);
  }

  .cols {
    grid-template-columns: 1fr;
    gap: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}