/* ============================================================================
   Shared stylesheet for the read/ app family (start screen, game pages,
   guide/reference pages). Structural variables, fonts, colors and the
   card-based layout are lifted directly from read_guide.html's own
   premium dark-mode design so every screen in this app feels like one
   continuous product with the guide itself. The word-stage / letter
   animation colors (amber/coral/connector-blue/silent-gray) are kept as
   their own separate palette - they're functional signal colors owned by
   the PatternAnimation engine (see engine.js), not page chrome.
   ============================================================================ */

:root {
  /* -- read_guide.html's own palette, verbatim -- */
  --bg-color: #232323;
  --card-color: #1d1d1d;
  --exception-bg: #161616;
  --electric-yellow: #e6c27a;
  --hot-pink: #FF2E88;
  --light-gray: #D8D8D8;
  --darker-gray: #888888;

  /* -- game-engine functional colors (typography apps' palette) -- */
  --stage-bg: #0A0A0A;
  --amber: #FFB74D;
  --coral: #FF6E4A;
  --silent-gray: #9E9E9E;
  --connector: #80D8FF;

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background-color: var(--bg-color);
  color: var(--light-gray);
  font-family: Verdana, Geneva, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  padding-bottom: 60px;
}

a { color: inherit; }

/* ---------------------------------------------------------------------------
   Header (shared: start screen, guide pages)
   ------------------------------------------------------------------------- */
header.app-header {
  position: sticky;
  top: 0;
  background-color: rgba(18, 18, 18, 0.95);
  backdrop-filter: blur(5px);
  border-bottom: 2px solid var(--card-color);
  padding: 15px 20px;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

header.app-header h1 {
  color: var(--electric-yellow);
  font-size: 1.4rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: var(--card-color);
  color: var(--light-gray);
  padding: 7px 16px;
  border-radius: 20px;
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 700;
  border: 1px solid #333;
  transition: background 0.2s, color 0.2s;
}
.back-link:hover { background-color: var(--electric-yellow); color: #121212; }

.header-title {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-link {
  display: inline-flex;
  border-radius: 50%;
  line-height: 0;
  flex-shrink: 0;
  transition: transform 0.2s var(--ease);
}
.logo-link:hover { transform: scale(1.06); }

.logo-img {
  width: 56px; /* matches study/practice's index.html logo size */
  height: 56px;
  border-radius: 50%;
  display: block;
  object-fit: cover;
}

.site-footer {
  text-align: center;
  color: var(--darker-gray);
  font-size: 0.8rem;
  padding: 40px 20px 20px;
  letter-spacing: 0.02em;
}

main {
  max-width: 900px;
  margin: 30px auto;
  padding: 0 20px;
}

.page-intro {
  color: var(--darker-gray);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

/* ---------------------------------------------------------------------------
   Start screen
   ------------------------------------------------------------------------- */
.hero {
  text-align: center;
  padding: 48px 20px 24px;
}
.hero h1 {
  color: var(--electric-yellow);
  font-size: 1.9rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.hero p {
  color: var(--darker-gray);
  margin-top: 8px;
  font-size: 1rem;
}

.resume-btn {
  margin: 22px auto 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background-color: var(--electric-yellow);
  color: #121212;
  font-family: inherit;
  font-weight: 800;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 14px 28px;
  border: none;
  border-radius: 30px;
  cursor: pointer;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
  box-shadow: 0 0 0 rgba(247, 240, 0, 0);
}
.resume-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(247, 240, 0, 0.25);
}
.resume-btn:disabled {
  background-color: var(--card-color);
  color: var(--darker-gray);
  cursor: default;
}

.group-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 18px;
  margin-top: 12px;
}

.group-card {
  background-color: var(--card-color);
  border: 1px solid #252525;
  border-radius: 10px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}
.group-card:hover { border-color: #3a3a3a; transform: translateY(-2px); }

.group-card .group-title {
  color: white;
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.group-card .group-number {
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--darker-gray);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  flex-grow: 1;
}

.group-card .group-actions {
  display: flex;
  gap: 10px;
  margin-top: 4px;
}

.group-card .go-btn,
.group-card .help-btn {
  font-family: inherit;
  font-weight: 800;
  font-size: 1.1rem;
  border-radius: 20px;
  border: none;
  cursor: pointer;
  padding: 9px 0;
  text-decoration: none;
  text-align: center;
  transition: transform 0.15s var(--ease), opacity 0.15s var(--ease);
}
.group-card .go-btn { flex: 1 1 auto; background-color: var(--electric-yellow); color: #121212; }
.group-card .help-btn { width: 44px; flex: 0 0 auto; background-color: #2a2a2a; color: var(--light-gray); border: 1px solid #3a3a3a; }
.group-card .go-btn:hover,
.group-card .help-btn:hover { transform: translateY(-1px); opacity: 0.92; }

/* ---------------------------------------------------------------------------
   Rule cards (guide/reference pages) - lifted straight from read_guide.html
   ------------------------------------------------------------------------- */
.section-title {
  color: white;
  font-size: 1.4rem;
  margin: 35px 0 15px 0;
  border-left: 4px solid var(--electric-yellow);
  padding-left: 10px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.section-title:first-child { margin-top: 0; }

.rule-card {
  background-color: var(--card-color);
  border-radius: 8px;
  margin-bottom: 16px;
  overflow: hidden;
  border: 1px solid #252525;
}

.card-header {
  padding: 18px 20px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  background-color: #222222;
}

.pattern-visual {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--electric-yellow);
  letter-spacing: 0.05em;
}

.header-meta { display: flex; align-items: center; gap: 12px; }

.badge {
  font-size: 0.75rem;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: 4px;
  text-transform: uppercase;
}
.badge-5 { background-color: #2b7a3e; color: #e2f7e6; }
.badge-4 { background-color: #3b6b8c; color: #e6f2fc; }
.badge-3 { background-color: #8c763b; color: #fcf6e6; }
.badge-2 { background-color: #8c4f3b; color: #fcebe6; }
.badge-1 { background-color: #7d2c2c; color: #fce8e8; }

.arrow { font-size: 0.8rem; transition: transform 0.3s; color: var(--darker-gray); }
.rule-card.active .arrow { transform: rotate(180deg); }

.card-body { padding: 20px; display: none; border-top: 1px solid #2a2a2a; }
.rule-card.active .card-body { display: block; }

.explanation { font-size: 0.95rem; margin-bottom: 15px; color: #c8c8c8; }

.chip-group-title {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--darker-gray);
  margin-bottom: 6px;
  font-weight: 600;
}

.chips-container { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }

.word-chip {
  background-color: #2a2a2a;
  color: white;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.95rem;
  font-weight: 600;
  border: 1px solid #3a3a3a;
}

.exception-panel {
  background-color: var(--exception-bg);
  border-left: 4px solid var(--hot-pink);
  border-top: 1px solid #25121a;
  border-right: 1px solid #25121a;
  border-bottom: 1px solid #25121a;
  padding: 12px 16px;
  border-radius: 0 6px 6px 0;
  font-style: italic;
}

.exception-title {
  color: var(--hot-pink);
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
  font-style: normal;
}

.exception-words { color: #e0b3c5; }

.global-controls { display: flex; justify-content: flex-end; gap: 10px; margin-bottom: 10px; }

.control-btn {
  background: none;
  border: 1px solid #444;
  color: var(--darker-gray);
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.75rem;
  font-family: inherit;
}
.control-btn:hover { color: white; border-color: #666; }

/* ---------------------------------------------------------------------------
   Game page: viewer stage (letters), word picker, pattern library
   ------------------------------------------------------------------------- */
.game-body {
  padding-bottom: 0;
}

#viewer {
  position: relative;
  min-height: 38vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 16px 20px;
  background: var(--stage-bg);
}

.word-stage {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: clamp(2px, 0.6vw, 8px);
}

.letter {
  font-family: Verdana, Geneva, sans-serif;
  font-size: clamp(80px, 11vw, 160px);
  font-weight: 800;
  line-height: 1;
  display: inline-block;
  color: #FFFFFF;
  transform-origin: bottom center;
  will-change: transform, opacity, color, text-shadow;
  position: relative;
  user-select: none;
}
.letter.consonant { color: #FFFFFF; }
.letter.short-vowel { color: var(--amber); }
.letter.silent { color: var(--silent-gray); opacity: 0; }

.connector-svg {
  position: absolute;
  left: 0;
  top: -70px;
  width: 100%;
  height: calc(100% + 70px);
  overflow: visible;
  pointer-events: none;
}
.connector-path {
  fill: none;
  stroke: var(--connector);
  stroke-width: 2.5;
  stroke-linecap: round;
  opacity: 0;
}

.underline-bar {
  position: absolute;
  bottom: -16px;
  height: 3px;
  background: var(--connector);
  border-radius: 2px;
  opacity: 0;
  transform-origin: left center;
  pointer-events: none;
}

.pattern-label {
  /* Intentionally hidden: the pattern name (e.g. "PH", "-ED Suffix")
     shouldn't surface during the animation itself - the letters moving
     are the lesson, not a caption. engine.js still schedules its fade
     in/out timings; display:none just makes that invisible rather than
     touching that timing logic. */
  display: none;
}

.stub-stage {
  font-size: 16px;
  color: #555;
  letter-spacing: 0.03em;
  max-width: 560px;
  text-align: center;
  line-height: 1.6;
}

#word-meta {
  text-align: center;
  padding: 4px 16px 8px;
  color: var(--darker-gray);
  font-size: 0.85rem;
  min-height: 1.4em;
}

#word-picker {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 18px;
  max-width: 720px;
  margin: 0 auto 28px;
  padding: 0 24px;
}
#word-picker.visible { display: flex; }

.word-nav-btn {
  background: transparent;
  border: 1px solid #333;
  color: #ccc;
  font-family: inherit;
  font-size: 20px;
  line-height: 1;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}
.word-nav-btn:hover { border-color: white; color: white; }
.word-nav-btn:active { transform: scale(0.94); }

.word-nav-line {
  width: 72px;
  height: 0;
  border-top: 2px dotted #555;
  opacity: 0.7;
}

#pattern-library { max-width: 1000px; margin: 8px auto 0; padding: 8px 24px 48px; }
#pattern-library h2 {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--darker-gray);
  text-align: center;
  margin: 36px 0 20px;
  font-weight: 700;
}

.pattern-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 180px)); justify-content: center; gap: 14px; }

.pattern-card {
  background: var(--card-color);
  border: 1px solid #252525;
  border-radius: 12px;
  padding: 18px 12px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease), background 0.3s var(--ease);
}
.pattern-card:hover { border-color: #3a3a3a; transform: translateY(-2px); }
.pattern-card.active { border-style: dotted; border-width: 2px; border-color: var(--electric-yellow); }
.pattern-card .p-name { font-size: 0.95rem; font-weight: 800; color: var(--electric-yellow); letter-spacing: 0.03em; }

/* ---------------------------------------------------------------------------
   In-game controls: pause/resume + save & exit - icon-only, visible during
   active play. Lives inside the sticky app-header (not its own fixed
   element) so it can't overlap the back link, and stays visible on
   scroll the same way the header itself does.
   ------------------------------------------------------------------------- */
.game-controls {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.icon-btn {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid #333;
  background-color: rgba(29, 29, 29, 0.9);
  backdrop-filter: blur(4px);
  color: var(--light-gray);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), transform 0.15s var(--ease);
}
.icon-btn:hover { border-color: var(--electric-yellow); color: var(--electric-yellow); transform: translateY(-1px); }
.icon-btn:active { transform: scale(0.94); }
.icon-btn svg { width: 18px; height: 18px; fill: currentColor; }

.game-controls .icon-btn[data-action="exit"]:hover { border-color: var(--hot-pink); color: var(--hot-pink); }

/* Pause overlay */
#pause-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(6px);
  z-index: 1050;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 16px;
}
#pause-overlay.visible { display: flex; }
#pause-overlay .paused-label {
  color: var(--electric-yellow);
  font-size: 1.3rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
#pause-overlay .paused-hint { color: var(--darker-gray); font-size: 0.9rem; }

/* ---------------------------------------------------------------------------
   Debug panel (toggle with the ` key)
   ------------------------------------------------------------------------- */
#debug-panel {
  display: none;
  position: fixed;
  right: 0;
  top: 0;
  bottom: 0;
  width: 300px;
  background: rgba(8, 8, 8, 0.97);
  border-left: 1px solid #222;
  padding: 18px;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  font-size: 11px;
  color: #7CFFB2;
  overflow-y: auto;
  z-index: 999;
}
#debug-panel.visible { display: block; }
#debug-panel h3 { color: #fff; font-size: 12px; margin: 0 0 4px; letter-spacing: 0.05em; }
#debug-panel .hint { color: #555; font-size: 10px; margin-bottom: 14px; }
.debug-row { display: flex; justify-content: space-between; gap: 8px; padding: 5px 0; border-bottom: 1px solid #1a1a1a; color: #4d4d4d; }
.debug-row.active { color: #7CFFB2; }
.debug-row span:last-child { flex-shrink: 0; color: #666; }

.no-results { display: none; text-align: center; padding: 40px; color: var(--darker-gray); }

@media (max-width: 640px) {
  .letter { font-size: clamp(56px, 16vw, 110px); }
  .group-grid { grid-template-columns: 1fr; }
}