:root {
  color-scheme: light dark;
  --fg: #1a1a1a;
  --bg: #fdfdfd;
  --border: #ccc;
  --accent: #7a3b2e;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #eee;
    --bg: #1a1a1a;
    --border: #444;
    --accent: #e0a080;
  }
}

* { box-sizing: border-box; }

body {
  font-family: "Noto Sans TC", "PingFang TC", system-ui, sans-serif;
  background: var(--bg);
  color: var(--fg);
  max-width: 640px;
  margin: 2rem auto;
  padding: 0 1rem;
  line-height: 1.6;
}

h1 { font-size: 1.4rem; }
h2 { font-size: 1.2rem; margin-top: 2rem; border-top: 1px solid var(--border); padding-top: 1rem; }
h3 { font-size: 1rem; color: var(--accent); margin-bottom: 0.25rem; }

fieldset {
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 1rem;
}

label {
  display: block;
  margin: 0.4rem 0;
}

input[type="number"], input[type="text"], input[type="date"], select {
  padding: 0.3rem;
  margin-left: 0.3rem;
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 4px;
}

input[type="radio"] { margin-right: 0.3rem; }

.hint { font-size: 0.85rem; opacity: 0.75; margin: 0.5rem 0 0; }

/* ── 時辰選擇（6×2 按鈕格）── */
.shichen-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 6px;
}

.shichen-btn {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px 2px 6px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.shichen-btn:hover { border-color: var(--accent); }

.shichen-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
}

.shichen-btn .sz { font-size: 1.05rem; font-weight: 700; }
.shichen-btn .st { font-size: 0.6rem; opacity: 0.6; }
.shichen-btn.active .st { opacity: 0.8; }

input[type="date"] {
  font-size: 1rem;
  margin-left: 0;
}

.today-btn {
  background: transparent;
  color: var(--fg);
  font-size: 0.85rem;
  padding: 0.35rem 0.8rem;
  margin-left: 0.5rem;
}

.today-btn:hover { border-color: var(--accent); }

.random-btn {
  margin-top: 0.6rem;
  width: 100%;
  background: transparent;
  color: var(--fg);
  font-size: 0.85rem;
  padding: 0.4rem;
}

pre.shorthand {
  font-size: 0.95rem;
  border: 1px solid var(--accent);
  margin-top: 0;
}

/* ── 速記標題列 + 複製按鈕 ── */
.shorthand-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2rem;
  border-top: 1px solid var(--border);
  padding-top: 1rem;
}

.shorthand-head h2 {
  margin: 0;
  border-top: none;
  padding-top: 0;
}

.copy-btn {
  flex: none;
  background: transparent;
  color: var(--fg);
  font-size: 0.8rem;
  padding: 0.3rem 0.75rem;
}

.copy-btn:hover { border-color: var(--accent); }

.copy-btn.copied {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}

.actions { display: flex; gap: 0.75rem; margin-top: 1rem; }

button {
  padding: 0.5rem 1rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--accent);
  color: var(--bg);
  cursor: pointer;
}

button#daily-btn {
  background: transparent;
  color: var(--fg);
}

pre {
  white-space: pre-wrap;
  background: color-mix(in srgb, var(--fg) 6%, transparent);
  padding: 0.75rem;
  border-radius: 6px;
  font-size: 0.9rem;
}

.tiandipan-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0.4rem;
  margin: 0.5rem 0 1rem;
}

.td-cell {
  text-align: center;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.3rem 0;
}

.td-cell .sky { color: var(--accent); font-weight: bold; }

.error {
  color: #c0392b;
  font-weight: bold;
}