/* Word Randomizer — mobile-first styles. */

:root {
  --accent: #6366f1;
  --accent-strong: #8b5cf6;

  --bg: #0e0e13;
  --bg-elevated: #17171f;
  --surface: #1c1c27;
  --surface-active: #262633;
  --border: #2c2c3a;
  --text: #f2f2f7;
  --text-muted: #9494a8;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.45);

  --radius: 16px;
  --gap: 10px;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f4f4f7;
    --bg-elevated: #ffffff;
    --surface: #ffffff;
    --surface-active: #ececf3;
    --border: #e0e0e9;
    --text: #16161d;
    --text-muted: #6b6b7d;
    --shadow: 0 10px 30px rgba(20, 20, 40, 0.1);
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior-y: none;
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
  border: none;
  background: none;
  /* Stops iOS Safari from zooming in on a fast second tap. */
  touch-action: manipulation;
}

svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Layout: header and counter stay put, only the word board scrolls. */
.app {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  max-width: 640px;
  margin: 0 auto;
  padding: calc(var(--safe-top) + 20px) 16px 0;
}

.header {
  flex: none;
  text-align: center;
}

.title {
  margin: 0;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(100deg, var(--accent), var(--accent-strong));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.subtitle {
  margin: 6px 0 0;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* Counter */
.counter {
  flex: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 18px;
  padding: 8px 8px 8px 18px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.counter__label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
}

.counter__stepper {
  display: flex;
  align-items: center;
  gap: 4px;
}

.counter__value {
  min-width: 2.6ch;
  text-align: center;
  font-size: 1.15rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.stepper {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  transition: background-color 0.15s ease, transform 0.1s ease;
}

.stepper:active {
  background: var(--surface-active);
  transform: scale(0.94);
}

.stepper:disabled {
  opacity: 0.35;
  cursor: default;
  transform: none;
}

/* Word board */
.board {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  margin-top: 16px;
  padding-bottom: 8px;
}

.words {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap);
  margin: 0;
  padding: 0;
  list-style: none;
}

.word {
  display: inline-flex;
  align-items: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 1rem;
  font-weight: 500;
  box-shadow: var(--shadow);
  transition: transform 0.16s ease, opacity 0.16s ease, background-color 0.16s ease;
}

.word:active {
  background: var(--surface-active);
}

/* Mid-swap: the old word shrinks away before the new one is written in. */
.word.is-swapping {
  transform: scale(0.82);
  opacity: 0;
}

.word.is-fresh {
  animation: pop-in 0.26s cubic-bezier(0.34, 1.56, 0.64, 1) backwards;
}

@keyframes pop-in {
  from {
    transform: scale(0.7);
    opacity: 0;
  }
}

/* Placeholder chips shown while words.txt is still downloading. */
.word--skeleton {
  width: var(--skeleton-width, 92px);
  box-shadow: none;
  animation: pulse 1.3s ease-in-out infinite;
  pointer-events: none;
}

@keyframes pulse {
  50% {
    opacity: 0.45;
  }
}

.board__message {
  margin: 24px 4px;
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--text-muted);
  text-align: center;
}

/* Bottom action bar */
.actions {
  flex: none;
  display: flex;
  gap: 10px;
  padding: 12px 0 calc(var(--safe-bottom) + 12px);
  background: linear-gradient(to top, var(--bg) 62%, transparent);
}

.action {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 52px;
  padding: 0 16px;
  border-radius: var(--radius);
  font-size: 0.98rem;
  font-weight: 600;
  transition: transform 0.1s ease, filter 0.15s ease, background-color 0.15s ease;
}

.action:active {
  transform: scale(0.97);
}

.action--primary {
  color: #fff;
  background: linear-gradient(120deg, var(--accent), var(--accent-strong));
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.35);
}

.action--primary:active {
  filter: brightness(0.92);
}

.action--ghost {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
}

.action--ghost:active {
  background: var(--surface-active);
}

.action:disabled {
  opacity: 0.5;
  cursor: default;
  transform: none;
}

/* Toast */
.toast {
  position: fixed;
  left: 50%;
  bottom: calc(var(--safe-bottom) + 88px);
  z-index: 10;
  padding: 11px 20px;
  border-radius: 999px;
  background: var(--text);
  color: var(--bg);
  font-size: 0.88rem;
  font-weight: 600;
  white-space: nowrap;
  opacity: 0;
  transform: translate(-50%, 12px);
  transition: opacity 0.2s ease, transform 0.2s ease;
  pointer-events: none;
}

.toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* Wider screens get roomier chips; the layout itself stays the same. */
@media (min-width: 480px) {
  .word {
    min-height: 50px;
    font-size: 1.05rem;
  }

  .title {
    font-size: 1.6rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}