/* ===== adventure-core shared base ===== */
* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; touch-action: manipulation; }
html, body { width: 100%; height: 100%; overflow: hidden; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--text-color, #1F2937);
  user-select: none; -webkit-user-select: none;
  background: var(--bg-color, #FAFAF9);
}

/* ─── Animations ───────────────────────────────────────────── */
@keyframes core-shake { 0%,100%{transform:translateX(0)} 25%{transform:translateX(-8px)} 75%{transform:translateX(8px)} }
@keyframes core-popIn { 0%{transform:scale(0.6);opacity:0} 70%{transform:scale(1.05)} 100%{transform:scale(1);opacity:1} }
@keyframes core-float { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-10px)} }
@keyframes core-bob   { 0%,100%{transform:translateY(0) rotate(-2deg)} 50%{transform:translateY(-6px) rotate(2deg)} }
@keyframes core-slideUp { from{opacity:0;transform:translateY(30px)} to{opacity:1;transform:translateY(0)} }
@keyframes core-fadeIn { from{opacity:0} to{opacity:1} }
@keyframes core-glow { 0%,100%{box-shadow:0 0 20px var(--glow-color, rgba(252,211,77,0.4))} 50%{box-shadow:0 0 40px var(--glow-color, rgba(252,211,77,0.7))} }
@keyframes core-twinkle { 0%,100%{opacity:0.3;transform:scale(0.8)} 50%{opacity:0.9;transform:scale(1.1)} }
@keyframes core-shine { 0%{background-position:-200% center} 100%{background-position:200% center} }
@keyframes core-pulse { 0%,100%{transform:scale(1)} 50%{transform:scale(1.04)} }

/* ─── App layout ───────────────────────────────────────────── */
#app {
  position: relative; z-index: 1;
  width: 100%; height: 100%;
  max-width: 1024px; margin: 0 auto;
  overflow: hidden;
}
@media (orientation: portrait) and (max-width: 768px) { #app { max-width: 600px; } }

.screen { display: none; width: 100%; height: 100%; flex-direction: column; overflow: hidden; }
.screen.active { display: flex; }
.screen-scroll {
  flex: 1; overflow-y: auto; overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  padding-bottom: max(80px, env(safe-area-inset-bottom));
}
.screen-scroll::-webkit-scrollbar { width: 3px; }
.screen-scroll::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.2); border-radius: 4px; }

.screen-header {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px; flex-shrink: 0; z-index: 3;
  background: var(--header-bg, rgba(255,255,255,0.92));
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--header-border, rgba(0,0,0,0.1));
}
.screen-title { font-size: 18px; font-weight: 900; color: var(--accent-color, #1F2937); }

.back-btn {
  width: 42px; height: 42px; border-radius: 50%; border: none;
  background: var(--btn-back-bg, rgba(0,0,0,0.06));
  color: var(--accent-color, #1F2937);
  font-size: 22px; font-weight: 800; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  min-width: 56px; min-height: 56px;
}
.back-btn:active { transform: scale(0.95); }

/* ─── Buttons ──────────────────────────────────────────────── */
.btn {
  padding: 14px 28px; min-height: 56px;
  border-radius: 18px; border: none;
  font-size: 16px; font-weight: 800; cursor: pointer;
  font-family: inherit;
  transition: all 0.15s;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
}
.btn:active { transform: translateY(2px); }
.btn-primary {
  background: var(--btn-primary-bg, linear-gradient(180deg, #FF8C42, #D9622A));
  color: var(--btn-primary-text, #FFF);
  box-shadow: 0 4px 0 var(--btn-primary-shadow, #B14B1F), 0 8px 18px rgba(0,0,0,0.15);
}
.btn-primary:active { box-shadow: 0 1px 0 var(--btn-primary-shadow, #B14B1F); }
.btn-ghost {
  background: var(--btn-ghost-bg, rgba(0,0,0,0.05));
  color: var(--btn-ghost-text, #1F2937);
  border: 2px solid var(--btn-ghost-border, rgba(0,0,0,0.1));
}
.btn-danger {
  background: linear-gradient(180deg, #EF4444, #B91C1C);
  color: #FFF; box-shadow: 0 4px 0 #7F1D1D;
}
.btn-lg { padding: 18px 36px; font-size: 18px; min-height: 64px; border-radius: 22px; }
.btn-sm { padding: 10px 18px; font-size: 14px; min-height: 44px; }

/* ─── Cards & modals ───────────────────────────────────────── */
.card {
  background: var(--card-bg, #FFF);
  border-radius: 20px;
  padding: 18px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.08);
  border: 2px solid var(--card-border, transparent);
}

.modal-overlay {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(0,0,0,0.55); backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  animation: core-fadeIn 0.25s ease;
}
.modal-card {
  background: var(--card-bg, #FFF);
  border-radius: 24px;
  padding: 26px;
  max-width: 88vw; max-height: 88vh; overflow: auto;
  animation: core-popIn 0.3s ease;
}

/* ─── Battle intro overlay ─────────────────────────────────── */
.core-battle-intro {
  position: fixed; inset: 0; z-index: 200;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 12px;
  background: radial-gradient(circle at center, var(--intro-bg-1, rgba(0,0,0,0.85)), var(--intro-bg-2, rgba(0,0,0,0.95)));
  animation: core-fadeIn 0.3s ease;
}
.core-battle-intro .bi-title {
  font-size: 44px; font-weight: 900;
  color: var(--intro-color, #FCD34D);
  text-shadow: 3px 3px 0 rgba(0,0,0,0.5);
  animation: core-popIn 0.6s ease;
}
.core-battle-intro .bi-sub {
  font-size: 20px; font-weight: 700;
  color: var(--intro-sub-color, #FEF3C7);
}

/* ─── Pencil canvas wrapper ────────────────────────────────── */
.pencil-pad {
  position: relative;
  background: var(--pad-bg, #FFF);
  border: 3px dashed var(--pad-border, rgba(0,0,0,0.15));
  border-radius: 16px;
  overflow: hidden;
  touch-action: none;
}
.pencil-pad canvas { display: block; width: 100%; height: 100%; }
.pencil-pad .pad-toolbar {
  position: absolute; top: 8px; right: 8px;
  display: flex; gap: 6px;
}
.pencil-pad .pad-tool {
  width: 36px; height: 36px; border-radius: 10px;
  background: rgba(255,255,255,0.95); border: 1px solid rgba(0,0,0,0.1);
  font-size: 18px; display: flex; align-items: center; justify-content: center;
  cursor: pointer;
}

/* ─── Bottom nav (per-game theme overrides) ────────────────── */
.bottom-nav {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 50;
  display: flex; max-width: 600px; margin: 0 auto;
  background: var(--nav-bg, rgba(255,255,255,0.95));
  backdrop-filter: blur(15px);
  border-top: 2px solid var(--nav-border, rgba(0,0,0,0.08));
  padding: 8px 8px max(12px, env(safe-area-inset-bottom));
}
.nav-btn {
  flex: 1; display: flex; flex-direction: column; align-items: center; gap: 2px;
  padding: 8px 4px; border: none; background: transparent;
  color: var(--nav-text-inactive, rgba(0,0,0,0.4));
  font-size: 12px; cursor: pointer; border-radius: 12px; transition: all 0.2s;
  min-height: 56px;
}
.nav-btn.active {
  color: var(--accent-color, #1F2937);
  background: var(--nav-active-bg, rgba(0,0,0,0.05));
  transform: translateY(-2px);
}
.nav-icon { font-size: 22px; line-height: 1; }
.nav-label { font-size: 11px; font-weight: 700; }

/* ─── Effects (game-message zone, progress bar, ai hint) ───── */
.game-msg { min-height: 28px; text-align: center; font-size: 16px; font-weight: 700; margin-top: 10px; color: var(--text-color, #1F2937); }
.progress-track { height: 12px; background: var(--track-bg, rgba(0,0,0,0.1)); border-radius: 8px; overflow: hidden; }
.progress-fill {
  height: 100%;
  background: var(--progress-fill, linear-gradient(90deg, #FCD34D, #F59E0B));
  transition: width 0.5s ease;
}
.ai-hint {
  background: var(--ai-hint-bg, rgba(0,0,0,0.04));
  border: 1px solid var(--ai-hint-border, rgba(0,0,0,0.1));
  border-radius: 14px; padding: 12px 16px;
  font-size: 14px; color: var(--text-color, #1F2937);
  text-align: center; margin-top: 8px;
  line-height: 1.5; font-weight: 600;
  animation: core-slideUp 0.3s;
}

/* ─── Responsive (iPad-first) ──────────────────────────────── */
@media (min-width: 768px) {
  .btn { font-size: 17px; }
  .btn-lg { font-size: 20px; }
}
@media (max-width: 380px) {
  .btn { padding: 12px 22px; font-size: 14px; }
  .btn-lg { padding: 14px 30px; font-size: 16px; }
  .screen-title { font-size: 16px; }
}