/* ===== Operation Alchemy — Mystic Purple Theme ===== */
:root {
  --bg-color: #1B2A4E;
  --text-color: #E8EAF6;
  --accent-color: #FFE66D;
  --secondary: #A855F7;
  --tertiary: #6B4F8F;
  --card-bg: #2A3B6A;
  --card-border: rgba(255,230,109,0.3);
  --header-bg: rgba(27,42,78,0.92);
  --header-border: rgba(255,230,109,0.2);
  --nav-bg: rgba(27,42,78,0.96);
  --nav-border: rgba(255,230,109,0.15);
  --nav-text-inactive: rgba(232,234,246,0.45);
  --nav-active-bg: rgba(255,230,109,0.15);
  --btn-back-bg: rgba(255,230,109,0.12);
  --btn-primary-bg: linear-gradient(180deg, #A855F7, #7E22CE 50%, #4C1D95);
  --btn-primary-text: #FFE66D;
  --btn-primary-shadow: #3B0764;
  --btn-ghost-bg: rgba(168,85,247,0.15);
  --btn-ghost-text: #DDD6FE;
  --btn-ghost-border: rgba(168,85,247,0.4);
  --glow-color: rgba(255,230,109,0.55);
  --progress-fill: linear-gradient(90deg, #FFE66D, #A855F7, #EC4899);
  --intro-bg-1: rgba(76,29,149,0.92);
  --intro-bg-2: rgba(0,0,0,0.95);
  --intro-color: #FFE66D;
  --intro-sub-color: #DDD6FE;
  --ai-hint-bg: rgba(168,85,247,0.18);
  --ai-hint-border: rgba(168,85,247,0.4);
  --pad-bg: #F5F3F0;
  --pad-border: rgba(255,230,109,0.5);
}

body {
  background:
    radial-gradient(ellipse at top, #4C1D95 0%, transparent 60%),
    radial-gradient(ellipse at bottom right, #312E81 0%, transparent 50%),
    linear-gradient(180deg, #0F172A 0%, #1B2A4E 60%, #1E1B4B 100%);
  color: var(--text-color);
}

#bg-glyphs { position: fixed; inset: 0; pointer-events: none; z-index: 0; overflow: hidden; }
#bg-glyphs::before, #bg-glyphs::after {
  content: ''; position: absolute; border-radius: 50%; opacity: 0.4;
  filter: blur(60px);
}
#bg-glyphs::before { top: -100px; right: -60px; width: 240px; height: 240px; background: #A855F7; }
#bg-glyphs::after  { bottom: -80px; left: -80px; width: 280px; height: 280px; background: #FFE66D; opacity: 0.2; }

/* ─── Home: Alchemist's tower ────────────────────────────── */
.alchemist-home {
  display: flex; flex-direction: column; gap: 16px;
  padding: 16px 18px 30px;
  animation: core-slideUp 0.5s ease;
}

.master-banner {
  display: flex; align-items: center; gap: 14px;
  background: linear-gradient(135deg, #2A3B6A, #4C1D95);
  border: 3px solid var(--accent-color);
  border-radius: 22px;
  padding: 14px 18px;
  box-shadow: 0 6px 16px rgba(168,85,247,0.3);
  position: relative;
}
.master-banner::before {
  content: '⚗️'; position: absolute; top: -14px; left: 14px;
  background: var(--secondary); color: var(--accent-color);
  padding: 4px 10px; border-radius: 12px; font-size: 14px;
  border: 2px solid var(--accent-color);
}
.master-avatar { font-size: 54px; line-height: 1; animation: core-float 3s ease-in-out infinite; filter: drop-shadow(0 4px 8px rgba(255,230,109,0.4)); }
.master-info { flex: 1; }
.master-name { font-size: 17px; font-weight: 900; color: var(--accent-color); }
.master-stats { display: flex; gap: 12px; margin-top: 4px; font-size: 13px; font-weight: 700; color: #DDD6FE; }

.spell-card {
  background:
    linear-gradient(180deg, rgba(76,29,149,0.85), rgba(46,16,101,0.95)),
    radial-gradient(circle at 30% 20%, rgba(255,230,109,0.1), transparent 50%);
  border: 4px solid var(--accent-color);
  border-radius: 24px;
  padding: 22px 20px 18px;
  position: relative;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4), inset 0 2px 8px rgba(255,255,255,0.05);
}
.spell-card::before {
  content: '📜 当前配方';
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  background: linear-gradient(135deg, #A855F7, #6B21A8);
  color: var(--accent-color);
  padding: 4px 16px; border-radius: 14px;
  font-size: 13px; font-weight: 900; letter-spacing: 1px;
  border: 2px solid var(--accent-color);
  white-space: nowrap;
}
.unit-num-tag {
  display: inline-block;
  background: var(--accent-color); color: #1B2A4E;
  padding: 4px 14px; border-radius: 12px;
  font-size: 12px; font-weight: 900; margin-bottom: 10px;
  letter-spacing: 1px;
}
.unit-icon { font-size: 60px; display: block; text-align: center; margin: 6px 0 8px;
  animation: core-float 3s ease-in-out infinite;
  filter: drop-shadow(0 4px 12px rgba(255,230,109,0.6));
}
.unit-name { font-size: 26px; font-weight: 900; color: var(--accent-color); text-align: center; text-shadow: 2px 2px 0 #1B2A4E; }
.unit-workbench { font-size: 14px; color: #DDD6FE; text-align: center; margin: 4px 0 10px; font-style: italic; }
.unit-concept-chips { display: flex; gap: 6px; flex-wrap: wrap; justify-content: center; }
.cc-chip {
  background: rgba(255,230,109,0.15); border: 2px solid rgba(255,230,109,0.35);
  color: var(--accent-color); padding: 5px 10px; border-radius: 10px;
  font-size: 12px; font-weight: 700;
}

.cast-btn {
  width: 100%; padding: 18px 20px;
  background: linear-gradient(180deg, #C084FC, #A855F7 50%, #7E22CE);
  border: 4px solid var(--accent-color);
  border-radius: 22px;
  color: var(--accent-color);
  font-size: 22px; font-weight: 900;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center; gap: 12px;
  box-shadow: 0 6px 0 #4C1D95, 0 12px 28px rgba(168,85,247,0.5);
  text-shadow: 2px 2px 0 rgba(0,0,0,0.4);
  animation: core-glow 2.5s ease-in-out infinite;
}
.cast-btn:active { transform: translateY(4px); box-shadow: 0 2px 0 #4C1D95; }
.cast-btn .wand-emoji { font-size: 28px; animation: core-bob 1.5s ease-in-out infinite; }

.alchemy-progress {
  background: rgba(168,85,247,0.15);
  border: 2px solid rgba(255,230,109,0.3);
  border-radius: 14px;
  padding: 12px 16px;
  text-align: center;
}
.alchemy-progress .progress-track { --track-bg: rgba(0,0,0,0.4); border: 2px solid rgba(255,230,109,0.2); margin-bottom: 6px; }
.alchemy-progress-text { font-size: 13px; font-weight: 800; color: var(--accent-color); letter-spacing: 1px; }

/* ─── Lab map ──────────────────────────────────────────── */
.lab-floor { padding: 16px 14px 80px; }
.lab-banner {
  text-align: center; margin-bottom: 20px;
  background: linear-gradient(135deg, #2A3B6A, #4C1D95);
  border: 3px solid var(--accent-color);
  border-radius: 20px;
  padding: 14px;
}
.lab-title { font-size: 24px; font-weight: 900; color: var(--accent-color); text-shadow: 2px 2px 0 #1B2A4E; }
.lab-sub { font-size: 13px; color: #DDD6FE; margin-top: 4px; font-weight: 700; }

.benches-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.bench-card {
  background: linear-gradient(135deg, #2A3B6A, #1E1B4B);
  border: 3px solid var(--accent-color);
  border-radius: 20px;
  padding: 16px 12px;
  text-align: center; cursor: pointer;
  transition: transform 0.2s;
  box-shadow: 0 5px 0 #4C1D95;
  position: relative;
  animation: core-slideUp 0.3s ease backwards;
}
.bench-card:nth-child(1) { animation-delay: 0s; }
.bench-card:nth-child(2) { animation-delay: 0.04s; }
.bench-card:nth-child(3) { animation-delay: 0.08s; }
.bench-card:nth-child(4) { animation-delay: 0.12s; }
.bench-card:nth-child(5) { animation-delay: 0.16s; }
.bench-card:nth-child(6) { animation-delay: 0.2s; }
.bench-card:nth-child(7) { animation-delay: 0.24s; }
.bench-card:nth-child(8) { animation-delay: 0.28s; }

.bench-card:active { transform: translateY(3px); box-shadow: 0 2px 0 #4C1D95; }
.bench-card.current { background: linear-gradient(135deg, #6B21A8, #A855F7); animation: core-glow 2s ease-in-out infinite, core-slideUp 0.3s backwards; }
.bench-card.completed { background: linear-gradient(135deg, #166534, #15803D); border-color: #FCD34D; }
.bench-card.completed::before {
  content: '⚗️✓'; position: absolute; top: -8px; right: -8px;
  background: #FCD34D; color: #14532D; padding: 4px 8px;
  border-radius: 50%; font-weight: 900; font-size: 13px; border: 2px solid #1B2A4E;
}
.bench-card.locked {
  background: linear-gradient(135deg, #1F2937, #111827);
  border-color: rgba(255,255,255,0.1);
  opacity: 0.5; pointer-events: none;
}
.bench-tag {
  background: var(--accent-color); color: #1B2A4E;
  padding: 3px 10px; border-radius: 10px; font-size: 11px; font-weight: 900;
  display: inline-block; margin-bottom: 6px; letter-spacing: 1px;
}
.bench-icon { font-size: 42px; margin: 4px 0; animation: core-float 4s ease-in-out infinite; }
.bench-name { font-size: 14px; font-weight: 900; color: var(--accent-color); }
.bench-sub { font-size: 11px; color: #DDD6FE; margin-top: 2px; font-weight: 600; }
.bench-stars { font-size: 14px; margin-top: 4px; }

/* ─── Bench gameplay ──────────────────────────────────── */
.bench-stage { padding: 14px; display: flex; flex-direction: column; gap: 12px; }
.bench-banner {
  background: linear-gradient(135deg, #2A3B6A, #4C1D95);
  border: 3px solid var(--accent-color);
  border-radius: 18px;
  padding: 14px;
  display: flex; align-items: center; gap: 12px;
}
.bb-icon { font-size: 42px; }
.bb-info { flex: 1; }
.bb-en { font-size: 18px; font-weight: 900; color: var(--accent-color); }
.bb-zh { font-size: 13px; color: #DDD6FE; font-weight: 700; }
.bb-counter { font-size: 13px; color: var(--accent-color); font-weight: 900; }

.problem-card {
  background: linear-gradient(180deg, rgba(76,29,149,0.4), rgba(27,42,78,0.6));
  border: 3px solid var(--accent-color);
  border-radius: 20px;
  padding: 18px;
}
.problem-text { font-size: 17px; font-weight: 700; color: #E8EAF6; line-height: 1.5; margin-bottom: 12px; }
.problem-prompt { font-size: 14px; color: var(--accent-color); font-weight: 800; margin-bottom: 10px; }

/* Digit ball drag area */
.ball-tray {
  display: flex; flex-wrap: wrap; gap: 10px;
  justify-content: center;
  background: rgba(0,0,0,0.3);
  border: 2px dashed rgba(255,230,109,0.4);
  border-radius: 16px;
  padding: 12px;
  min-height: 80px;
  margin-bottom: 12px;
}
.digit-ball {
  width: 56px; height: 56px; border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #FFE66D, #F59E0B);
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; font-weight: 900; color: #1B2A4E;
  cursor: grab; user-select: none; touch-action: none;
  box-shadow: 0 4px 0 #B45309, 0 6px 18px rgba(255,230,109,0.4);
  transition: transform 0.15s;
}
.digit-ball:active { cursor: grabbing; transform: scale(1.1); }
.digit-ball.placed { background: radial-gradient(circle at 35% 35%, #C084FC, #7E22CE); color: #FFE66D; }

.drop-slot {
  min-width: 60px; min-height: 60px;
  border: 3px dashed rgba(255,230,109,0.5);
  border-radius: 12px;
  background: rgba(255,230,109,0.08);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 22px; font-weight: 800; color: rgba(255,230,109,0.5);
  margin: 0 4px;
  vertical-align: middle;
}
.drop-slot.filled { border-style: solid; border-color: var(--accent-color); color: var(--accent-color); background: rgba(255,230,109,0.18); }
.drop-slot.correct { border-color: #4ADE80; color: #BBF7D0; background: rgba(74,222,128,0.2); animation: core-popIn 0.4s; }
.drop-slot.wrong { border-color: #F87171; color: #FCA5A5; background: rgba(248,113,113,0.2); animation: core-shake 0.4s; }

/* Choice tiles for picker problems */
.choice-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 10px;
  margin-bottom: 12px;
}
.choice-tile {
  padding: 16px 12px;
  background: linear-gradient(180deg, #2A3B6A, #1E1B4B);
  border: 3px solid var(--accent-color);
  border-radius: 14px;
  color: var(--accent-color);
  font-size: 17px; font-weight: 800;
  cursor: pointer;
  box-shadow: 0 4px 0 #4C1D95;
  text-align: center;
}
.choice-tile:active { transform: translateY(2px); box-shadow: 0 2px 0 #4C1D95; }
.choice-tile.correct { background: linear-gradient(180deg, #16A34A, #15803D); border-color: #4ADE80; color: #BBF7D0; }
.choice-tile.wrong { background: linear-gradient(180deg, #DC2626, #991B1B); border-color: #F87171; color: #FCA5A5; }

/* Sketchpad overlay for Pencil */
.scratch-pad {
  height: 220px;
  margin-top: 12px;
  background:
    repeating-linear-gradient(0deg, transparent 0, transparent 35px, rgba(255,230,109,0.1) 35px, rgba(255,230,109,0.1) 36px),
    #F5F3F0;
  border: 3px dashed rgba(255,230,109,0.5);
  border-radius: 14px;
  overflow: hidden;
}
.scratch-pad .pencil-pad { width: 100%; height: 100%; background: transparent; border: none; }
.scratch-pad .pad-tool { background: rgba(76,29,149,0.9); color: #FFE66D; border-color: rgba(255,230,109,0.4); }

.bench-actions { display: flex; gap: 10px; margin-top: 8px; }
.bench-actions .btn { flex: 1; }

/* Complete */
.complete-screen {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 18px; padding: 40px 20px;
  text-align: center; animation: core-slideUp 0.5s ease;
  min-height: 60vh;
}
.complete-emoji { font-size: 90px; animation: core-float 1.5s ease-in-out infinite; filter: drop-shadow(0 8px 14px rgba(255,230,109,0.6)); }
.complete-title { font-size: 28px; font-weight: 900; color: var(--accent-color); text-shadow: 2px 2px 0 #1B2A4E; }
.complete-stars { font-size: 40px; letter-spacing: 6px; }
.complete-coins {
  background: linear-gradient(135deg, #A855F7, #7E22CE); color: var(--accent-color);
  padding: 10px 24px; border-radius: 14px; font-size: 18px; font-weight: 900;
  border: 2px solid var(--accent-color);
}

/* Settings */
.settings-stage { padding: 24px 18px; display: flex; flex-direction: column; gap: 14px; }
.settings-section {
  background: linear-gradient(135deg, #2A3B6A, #1E1B4B);
  border: 3px solid var(--accent-color);
  border-radius: 18px; padding: 18px;
  display: flex; flex-direction: column; gap: 8px;
}
.settings-label { font-size: 14px; font-weight: 900; color: var(--accent-color); }
.settings-stat { font-size: 14px; color: #DDD6FE; font-weight: 600; }

@media (min-width: 768px) {
  .benches-grid { grid-template-columns: repeat(3, 1fr); }
  .unit-icon { font-size: 72px; }
  .unit-name { font-size: 32px; }
}