/* `:host` rules only take effect when this stylesheet is injected inside a
   Shadow DOM widget (see /embed.js); they are inert in the standalone pages
   where this file is linked normally, since there's no shadow host there. */
:root, :host {
  --bg: #f6f3ff;
  --bg-elevated: #ffffff;
  --tile-bg: #efeaff;
  --tile-border: #ddd3fb;
  --text: #201a3a;
  --text-dim: #746e96;
  --accent: #7c3aed;
  --accent-2: #ec4899;
  --accent-contrast: #ffffff;
  --good: #16a34a;
  --bad: #ef4444;
  --warn: #f59e0b;
  --radius: 14px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  /* .app fills the viewport on a standalone page, but inside a widget it
     should only be as tall as its content, and the overlay must stay
     within the widget's own box instead of covering the host page. */
  --app-min-height: 100vh;
  --overlay-position: fixed;
}

:host {
  --app-min-height: 0;
  --overlay-position: absolute;
}

:root[data-theme="dark"], :host([data-theme="dark"]) {
  --bg: #140f2b;
  --bg-elevated: #1f1847;
  --tile-bg: #2a2260;
  --tile-border: #3c3178;
  --text: #f5f2ff;
  --text-dim: #b3a8e6;
  --accent: #c084fc;
  --accent-2: #f472b6;
  --accent-contrast: #140f2b;
  --good: #4ade80;
  --bad: #f87171;
  --warn: #fbbf24;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]), :host(:not([data-theme="light"])) {
    --bg: #140f2b;
    --bg-elevated: #1f1847;
    --tile-bg: #2a2260;
    --tile-border: #3c3178;
    --text: #f5f2ff;
    --text-dim: #b3a8e6;
    --accent: #c084fc;
    --accent-2: #f472b6;
    --accent-contrast: #140f2b;
    --good: #4ade80;
    --bad: #f87171;
    --warn: #fbbf24;
  }
}

* { box-sizing: border-box; }

.hidden { display: none; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  min-height: 100%;
  transition: background-color 0.25s ease, color 0.25s ease;
  touch-action: manipulation;
}

.app {
  position: relative; /* containing block for .ad-overlay when absolute */
  max-width: 480px;
  margin: 0 auto;
  padding: 16px 16px 40px;
  min-height: var(--app-min-height, 100vh);
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  display: flex;
  flex-direction: column;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 4px 20px;
}

.brand {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.brand-accent {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-left: 2px;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.day-info {
  font-size: 13px;
  color: var(--text-dim);
}

.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: 999px;
  border: 1px solid var(--tile-border);
  background: var(--bg-elevated);
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}
.theme-toggle:active { transform: scale(0.94); }

.screen.hidden { display: none; }

.progress-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.len-badge {
  display: inline-block;
  margin-left: 6px;
  padding: 1px 8px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #fff;
  font-size: 11px;
  font-weight: 700;
}

.score-label { font-weight: 700; color: var(--text); }

.progress-bar-track {
  height: 6px;
  border-radius: 999px;
  background: var(--tile-bg);
  overflow: hidden;
  margin-bottom: 20px;
}
.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 0.4s ease;
}

.timer-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 28px;
}
.timer-bar-track {
  flex: 1;
  height: 10px;
  border-radius: 999px;
  background: var(--tile-bg);
  overflow: hidden;
}
.timer-fill {
  height: 100%;
  width: 100%;
  background: var(--good);
  transition: width 1s linear, background-color 0.3s ease;
}
.timer-fill.warn { background: var(--warn); }
.timer-fill.danger { background: var(--bad); }
.timer-num {
  min-width: 28px;
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--text-dim);
}

.answer-slots {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  min-height: 60px;
  margin-bottom: 24px;
}

.answer-slot {
  width: 44px;
  height: 52px;
  border-radius: 10px;
  border: 2px solid var(--tile-border);
  background: var(--bg-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 800;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform 0.1s ease, border-color 0.2s ease;
}
.answer-slot.filled {
  border-color: var(--accent);
  color: var(--accent);
}
.answer-slot.empty {
  cursor: default;
}
.answer-slot.correct {
  border-color: var(--good);
  background: color-mix(in srgb, var(--good) 18%, transparent);
  color: var(--good);
}
.answer-slot.wrong-shake {
  border-color: var(--bad);
  animation: shake 0.4s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

.letter-tiles {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.letter-tile {
  width: 50px;
  height: 56px;
  border-radius: 12px;
  border: none;
  color: #fff;
  font-size: 24px;
  font-weight: 800;
  text-transform: uppercase;
  cursor: pointer;
  box-shadow: 0 3px 0 rgba(0, 0, 0, 0.15);
  transition: transform 0.12s ease, opacity 0.2s ease;
}
.letter-tile:active { transform: scale(0.92) translateY(2px); box-shadow: none; }
.letter-tile.used {
  opacity: 0;
  pointer-events: none;
  transform: scale(0.6);
}

.controls {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
}

.ctrl-btn {
  flex: 1;
  padding: 14px 10px;
  border-radius: 12px;
  border: 1px solid var(--tile-border);
  background: var(--bg-elevated);
  color: var(--text);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
}
.ctrl-btn:active { transform: scale(0.97); }
.ctrl-btn:disabled { opacity: 0.5; cursor: default; }

.ctrl-primary {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-color: transparent;
  color: #fff;
}

.feedback {
  min-height: 24px;
  text-align: center;
  font-weight: 700;
  font-size: 15px;
}
.feedback.good { color: var(--good); }
.feedback.bad { color: var(--bad); }

/* Summary screen */

.summary-title {
  font-size: 26px;
  margin: 12px 0 4px;
  text-align: center;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.summary-day {
  text-align: center;
  color: var(--text-dim);
  font-size: 13px;
  margin-bottom: 24px;
}

.summary-stats {
  display: flex;
  gap: 10px;
  margin-bottom: 24px;
}
.stat {
  flex: 1;
  background: var(--bg-elevated);
  border: 1px solid var(--tile-border);
  border-radius: var(--radius);
  padding: 14px 8px;
  text-align: center;
}
.stat-value { font-size: 22px; font-weight: 800; }
.stat-caption { font-size: 11px; color: var(--text-dim); margin-top: 2px; }

.summary-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 6px;
  margin-bottom: 28px;
}
.sum-cell {
  aspect-ratio: 1;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  background: var(--tile-bg);
}
.sum-cell.correct { background: color-mix(in srgb, var(--good) 25%, transparent); }
.sum-cell.wrong { background: color-mix(in srgb, var(--bad) 20%, transparent); }

.summary-next {
  text-align: center;
  color: var(--text-dim);
  font-size: 13px;
  margin-top: 8px;
}

/* Archive: replay past days */

.archive-section {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--tile-border);
}
.archive-section.hidden { display: none; }

.archive-title {
  font-size: 15px;
  font-weight: 700;
  text-align: center;
  margin: 0 0 12px;
  color: var(--text-dim);
}

.archive-row {
  display: flex;
  gap: 10px;
}

.archive-select {
  flex: 1;
  padding: 12px 10px;
  border-radius: 12px;
  border: 1px solid var(--tile-border);
  background: var(--bg-elevated);
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
}

.archive-empty {
  text-align: center;
  color: var(--text-dim);
  font-size: 13px;
}

/* Ad overlay */

.ad-overlay {
  position: var(--overlay-position, fixed);
  inset: 0;
  background: rgba(10, 6, 24, 0.72);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 100;
}
.ad-overlay.hidden { display: none; }

.ad-card {
  width: 100%;
  max-width: 360px;
  background: var(--bg-elevated);
  border-radius: 18px;
  padding: 20px;
  text-align: center;
  border: 2px solid var(--tile-border);
}

.ad-label {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #fff;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.05em;
  margin-bottom: 14px;
}

.ad-video-placeholder {
  height: 160px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--tile-bg), var(--tile-border));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 14px;
}
.ad-play-icon {
  width: 46px;
  height: 46px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}
.ad-caption { font-size: 13px; color: var(--text-dim); }

.ad-progress-track {
  height: 8px;
  border-radius: 999px;
  background: var(--tile-bg);
  overflow: hidden;
  margin-bottom: 10px;
}
.ad-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 1s linear;
}

.ad-timer {
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.ad-word-reveal {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 8px;
}
.ad-word-reveal span { color: var(--accent); text-transform: uppercase; }

.ad-definition {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.4;
  margin-bottom: 14px;
}