/* ═══ 元素煉金工坊 — 基礎樣式 ═══ */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg-deep: #17142b;
  --bg-mid: #221d3f;
  --bg-panel: rgba(40, 33, 74, 0.72);
  --gold: #e8c26a;
  --gold-dim: #9a8350;
  --text: #efe9ff;
  --text-dim: #a89fd0;
  --danger: #d05a6e;
  --glow: 0 0 18px rgba(232, 194, 106, 0.35);
}

html, body {
  height: 100%;
  background: radial-gradient(ellipse at 50% 30%, var(--bg-mid) 0%, var(--bg-deep) 70%);
  color: var(--text);
  font-family: "Segoe UI", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  overflow: hidden;
  -webkit-user-select: none;
  user-select: none;
  touch-action: manipulation;
}

#app { height: 100%; position: relative; }

.screen {
  position: absolute; inset: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  overflow-y: auto;
}
.screen.active { display: flex; }

.hidden { display: none !important; }

/* ═══ 主選單 ═══ */
#screen-menu { justify-content: center; gap: 10px; }

.menu-glow {
  position: absolute; top: 12%; left: 50%; transform: translateX(-50%);
  width: 480px; height: 480px; border-radius: 50%;
  background: radial-gradient(circle, rgba(120, 90, 220, 0.25) 0%, transparent 65%);
  pointer-events: none;
}
.alchemy-circle {
  position: absolute; top: 50%; left: 50%;
  width: 560px; height: 560px;
  transform: translate(-50%, -50%);
  border: 1px solid rgba(232, 194, 106, 0.18);
  border-radius: 50%;
  pointer-events: none;
  animation: spin 90s linear infinite;
}
.alchemy-circle::before, .alchemy-circle::after {
  content: ""; position: absolute; inset: 34px;
  border: 1px dashed rgba(232, 194, 106, 0.14);
  border-radius: 50%;
}
.alchemy-circle::after { inset: 90px; border-style: solid; opacity: 0.5; }
@keyframes spin { to { transform: translate(-50%, -50%) rotate(360deg); } }

.game-title {
  font-size: clamp(1.8rem, 5vw, 3.2rem);
  letter-spacing: 0.12em;
  color: var(--gold);
  text-shadow: var(--glow);
  z-index: 1;
}
.title-rune { font-size: 0.7em; opacity: 0.8; }
.game-subtitle { color: var(--text-dim); letter-spacing: 0.3em; margin-bottom: 22px; z-index: 1; }

.menu-buttons { display: flex; flex-direction: column; gap: 10px; z-index: 1; width: min(320px, 80vw); }

.menu-btn {
  padding: 12px 24px;
  background: var(--bg-panel);
  border: 1px solid rgba(232, 194, 106, 0.35);
  border-radius: 10px;
  color: var(--text);
  font-size: 1.02rem;
  cursor: pointer;
  backdrop-filter: blur(6px);
  transition: transform 0.12s, box-shadow 0.12s, border-color 0.12s;
}
.menu-btn:hover { transform: translateY(-2px); box-shadow: var(--glow); border-color: var(--gold); }
.menu-btn.primary { border-color: var(--gold); color: var(--gold); font-weight: 600; }
.menu-btn.danger { border-color: rgba(208, 90, 110, 0.6); color: var(--danger); }
.menu-btn.small { font-size: 0.85rem; padding: 7px 14px; }
.menu-btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none; box-shadow: none; }
a.menu-btn { display: block; text-align: center; text-decoration: none; }
.manual-link { color: var(--gold); text-decoration: none; }
.manual-link:hover { text-decoration: underline; }

.menu-footer { position: absolute; bottom: 16px; color: var(--text-dim); font-size: 0.8rem; text-align: center; padding: 0 16px; }

/* ═══ 共用 header ═══ */
.screen-header {
  width: 100%; max-width: 1080px;
  display: flex; align-items: center; gap: 18px;
  padding: 20px 24px 10px;
}
.screen-header h2 { color: var(--gold); letter-spacing: 0.1em; }
.back-btn {
  background: none; border: 1px solid rgba(232,194,106,0.3); border-radius: 8px;
  color: var(--text); padding: 8px 14px; cursor: pointer; font-size: 0.95rem;
}
.back-btn:hover { border-color: var(--gold); color: var(--gold); }

kbd {
  background: rgba(255,255,255,0.1); border-radius: 4px; padding: 1px 5px;
  font-size: 0.75em; border: 1px solid rgba(255,255,255,0.15);
}

/* ═══ panel 通用 ═══ */
.panel {
  background: var(--bg-panel);
  border: 1px solid rgba(232, 194, 106, 0.22);
  border-radius: 14px;
  backdrop-filter: blur(8px);
}

/* ═══ modal ═══ */
.modal {
  position: fixed; inset: 0; z-index: 60;
  background: rgba(10, 8, 24, 0.72);
  display: flex; align-items: center; justify-content: center;
}
.modal-box {
  padding: 28px 32px;
  min-width: min(400px, 92vw);
  max-width: 92vw;
  max-height: 88vh;
  overflow-y: auto;
  display: flex; flex-direction: column; gap: 12px;
  text-align: center;
}
.modal-box h2 { color: var(--gold); margin-bottom: 6px; }

/* ═══ toast ═══ */
.toast-area {
  position: fixed; top: 18px; left: 50%; transform: translateX(-50%);
  z-index: 80; display: flex; flex-direction: column; gap: 8px; pointer-events: none;
}
.toast {
  background: linear-gradient(135deg, rgba(60,45,110,0.95), rgba(35,28,70,0.95));
  border: 1px solid var(--gold);
  border-radius: 10px;
  padding: 12px 22px;
  color: var(--gold);
  box-shadow: var(--glow);
  animation: toastIn 0.35s ease, toastOut 0.4s ease 3.4s forwards;
  text-align: center;
}
.toast small { display: block; color: var(--text); font-size: 0.8rem; margin-top: 3px; }
@keyframes toastIn { from { opacity: 0; transform: translateY(-14px); } }
@keyframes toastOut { to { opacity: 0; transform: translateY(-10px); } }