/* ==========================================================================
   Design System & Styling: Lemmings Web (Mobile-First)
   Refer to docs/DESIGN.md for detailed tokens and specifications.
   ========================================================================== */

:root {
  /* Color Palette */
  --bg-dark: #0c0f14;
  --hud-bg: #14171f;
  --card-bg: #222733;
  --card-hover: #2b3140;
  --card-selected: #2b281f;
  --border-idle: #384052;
  --border-active: #4a556d;
  --accent-gold: #f59e0b;
  --accent-gold-text: #fbbf24;
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --color-danger: #f87171;
  --color-success: #34d399;

  /* Typography */
  --font-mono: ui-monospace, 'SF Mono', 'Cascadia Code', 'Segoe UI Mono', monospace;

  /* Safe Area Insets */
  --safe-bottom: max(10px, env(safe-area-inset-bottom, 0px));
  --safe-top: max(10px, env(safe-area-inset-top, 0px));
  --safe-left: max(8px, env(safe-area-inset-left, 0px));
  --safe-right: max(8px, env(safe-area-inset-right, 0px));
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  -webkit-user-select: none;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-mono);
  touch-action: manipulation;
}

#app {
  display: flex;
  flex-direction: column;
  width: 100vw;
  height: 100dvh;
  position: relative;
  overflow: hidden;
}

/* ==========================================================================
   Top Header / Status HUD
   ========================================================================== */
#top-hud {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--safe-top) var(--safe-right) 6px var(--safe-left);
  background: var(--hud-bg);
  border-bottom: 1px solid var(--border-idle);
  position: relative;
  z-index: 110;
  flex-shrink: 0;
}

.level-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
  flex: 1 1 auto;
}

.level-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.level-subtitle {
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.stats-bar {
  display: flex;
  gap: 12px;
  align-items: center;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.stat-label {
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}

.stat-value {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-main);
  font-variant-numeric: tabular-nums;
}

.stat-value.highlight {
  color: var(--color-success);
}

/* Time Limit Progress Bar */
.time-progress-track {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: rgba(30, 41, 59, 0.7);
  overflow: hidden;
}

.time-progress-fill {
  height: 100%;
  width: 100%;
  background-color: var(--color-success);
  transition: width 200ms linear, background-color 250ms ease;
}

/* ==========================================================================
   Game Canvas Viewport
   ========================================================================== */
#viewport-container {
  flex: 1;
  position: relative;
  overflow: hidden;
  width: 100%;
  background: var(--bg-dark);
}

#game-canvas {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none; /* Pointer & touch gestures handled manually */
  cursor: crosshair;
}

/* ==========================================================================
   Bottom Thumb Zone (HUD & Controls)
   ========================================================================== */
#bottom-hud {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 6px var(--safe-right) var(--safe-bottom) var(--safe-left);
  background: var(--hud-bg);
  border-top: 1px solid var(--border-idle);
  position: relative;
  z-index: 110;
  flex-shrink: 0;
}

/* Row 1: System Controls (Menu, Pause, FastForward, Restart, Mute) */
.controls-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.ctrl-btn {
  height: 38px;
  min-width: 44px;
  padding: 0 10px;
  background: var(--card-bg);
  border: 1px solid var(--border-idle);
  border-radius: 6px;
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  box-shadow: 0 2px 0 #12151c;
  transition: transform 150ms ease, background 150ms ease, border-color 150ms ease;
}

.ctrl-btn:active {
  transform: translateY(1px);
  background: var(--card-hover);
}

.ctrl-btn.active {
  background: var(--card-selected);
  border-color: var(--accent-gold);
  color: var(--accent-gold-text);
}

/* Row 2: Skills Bar (Daumenzone, ≥ 48px Touch Targets) */
.skills-bar {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 2px;
}

.skills-bar::-webkit-scrollbar {
  display: none;
}

.skill-btn {
  flex: 1 0 48px;
  min-width: 48px;
  height: 52px;
  background: var(--card-bg);
  border: 1px solid var(--border-idle);
  border-radius: 6px;
  color: var(--text-main);
  font-family: var(--font-mono);
  cursor: pointer;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4px 2px;
  gap: 2px;
  box-shadow: 0 2px 0 #12151c, 0 4px 6px -1px rgba(0,0,0,0.4);
  transition: transform 150ms ease, border-color 150ms ease, background 150ms ease;
}

.skill-btn:active {
  transform: translateY(1px);
  background: var(--card-hover);
}

.skill-btn .skill-code {
  font-size: 11px;
  font-weight: 700;
  line-height: 13px;
}

.skill-btn .skill-count {
  font-size: 11px;
  font-weight: 700;
  background: #14171f;
  color: var(--text-muted);
  padding: 1px 6px;
  border-radius: 4px;
}

.skill-btn .skill-shortcut {
  font-size: 8px;
  color: var(--text-muted);
  display: none; /* Shown on larger screens */
}

/* State: Selected */
.skill-btn.selected {
  background: var(--card-selected);
  border: 2px solid var(--accent-gold);
  color: var(--accent-gold-text);
  box-shadow: 0 0 8px rgba(245, 158, 11, 0.3);
}

.skill-btn.selected .skill-count {
  background: var(--accent-gold);
  color: #14171f;
}

/* State: Disabled / Empty (Unmissverständlich leer) */
.skill-btn.disabled {
  opacity: 0.35;
  background: #12151c;
  border-color: #20242e;
  color: #475569;
  cursor: not-allowed;
  box-shadow: none;
}

.skill-btn.disabled .skill-code {
  color: #475569;
}

.skill-btn.disabled .skill-count {
  background: transparent;
  color: #3b4252;
  font-weight: 500;
}

/* ==========================================================================
   Responsive Thumb Zone Optimizations: Portrait Phone (<= 500px)
   ========================================================================== */
@media (max-width: 500px) {
  .skills-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
    overflow-x: visible;
  }
  .skill-btn {
    min-width: 0;
    height: 48px;
  }
  .controls-row {
    gap: 4px;
  }
  .ctrl-btn {
    flex: 1;
    min-width: 0;
    padding: 0 4px;
    font-size: 11px;
  }
}

/* ==========================================================================
   Responsive Optimizations: Landscape Phone (height <= 500px)
   ========================================================================== */
@media (max-height: 500px) {
  #top-hud {
    padding: 2px var(--safe-right) 2px var(--safe-left);
  }
  .level-title {
    font-size: 12px;
  }
  .level-subtitle {
    display: none;
  }
  .stat-value {
    font-size: 12px;
  }
  #bottom-hud {
    gap: 3px;
    padding: 3px var(--safe-right) var(--safe-bottom) var(--safe-left);
  }
  .ctrl-btn {
    height: 32px;
    font-size: 11px;
  }
  .skills-bar {
    gap: 4px;
  }
  .skill-btn {
    height: 44px;
    min-width: 44px;
    padding: 2px 1px;
  }
  .skill-btn .skill-code {
    font-size: 10px;
  }
  .skill-btn .skill-count {
    font-size: 10px;
    padding: 0 4px;
  }
}

/* ==========================================================================
   Modals & Overlays (Dialog, Victory, Defeat, Level Select)
   ========================================================================== */
.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(12, 15, 20, 0.85);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 16px;
}

.modal-overlay.hidden {
  display: none;
}

.modal-card {
  background: #1c212c;
  border: 1px solid var(--border-idle);
  border-radius: 10px;
  padding: 24px;
  max-width: 420px;
  width: 100%;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.7);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal-title {
  font-size: 20px;
  font-weight: 700;
  text-align: center;
}

.modal-title.victory {
  color: var(--color-success);
}

.modal-title.defeat {
  color: var(--color-danger);
}

.modal-body {
  font-size: 13px;
  line-height: 20px;
  color: var(--text-muted);
  text-align: center;
}

.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
}

.btn-primary {
  background: var(--accent-gold);
  color: #14171f;
  font-weight: 700;
  border: none;
  border-radius: 6px;
  padding: 12px 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  cursor: pointer;
  box-shadow: 0 2px 0 #b45309;
}

.btn-primary:active {
  transform: translateY(1px);
}

.btn-secondary {
  background: var(--card-bg);
  color: var(--text-main);
  border: 1px solid var(--border-idle);
  border-radius: 6px;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  cursor: pointer;
}

/* Level Select Grid */
.levels-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  max-height: 280px;
  overflow-y: auto;
}

.level-card-btn {
  background: var(--card-bg);
  border: 1px solid var(--border-idle);
  border-radius: 6px;
  padding: 10px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  cursor: pointer;
  color: var(--text-main);
  font-family: var(--font-mono);
  text-align: left;
}

.level-card-btn.locked {
  opacity: 0.45;
  cursor: not-allowed;
  border-color: #262b36;
}

.level-card-btn:not(.locked):hover,
.level-card-btn:not(.locked):active {
  background: var(--card-hover);
  border-color: var(--accent-gold);
}

.level-card-num {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent-gold-text);
}

.level-card-name {
  font-size: 11px;
  color: var(--text-main);
}

/* Desktop enhancements */
@media (min-width: 768px) {
  .skill-btn .skill-shortcut {
    display: block;
  }
  .skill-btn {
    flex: 1 0 60px;
    height: 56px;
  }
  .level-title {
    font-size: 16px;
  }
}

@media (max-width: 480px) {
  #top-hud {
    padding: var(--safe-top) 8px 4px 8px;
    gap: 8px;
  }
  .level-meta {
    max-width: 58%;
  }
  .level-title {
    font-size: 12px;
  }
  .level-subtitle {
    font-size: 9px;
  }
  .stats-bar {
    gap: 8px;
  }
  .stat-label {
    font-size: 8px;
  }
  .stat-value {
    font-size: 12px;
  }
}

@media (max-height: 480px) {
  #bottom-hud {
    padding: 3px 6px calc(3px + var(--safe-bottom)) 6px;
    gap: 4px;
  }
  .controls-row {
    margin-bottom: 2px;
  }
  .ctrl-btn {
    height: 30px;
    padding: 0 8px;
    font-size: 11px;
  }
  .skill-btn {
    height: 40px;
    padding: 2px 4px;
  }
  .skill-name {
    font-size: 9px;
  }
  .skill-count {
    font-size: 11px;
  }
  .skill-btn .skill-shortcut {
    display: none !important;
  }
}