:root {
  color-scheme: light;
  --bg: #f4f7fb;
  --bg-top: #f8fbff;
  --panel: #ffffff;
  --panel-soft: #fbfdff;
  --panel-strong: #ffffff;
  --text: #162033;
  --muted: #5b6780;
  --border: #dbe3f0;
  --primary: #2563eb;
  --primary-strong: #1d4ed8;
  --accent-soft: #e8f0ff;
  --control-bg: #eef4ff;
  --table-head: #f7faff;
  --shadow: 0 18px 48px rgba(20, 32, 62, 0.10);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #0f172a;
    --bg-top: #111c34;
    --panel: #162033;
    --panel-soft: #19263d;
    --panel-strong: #1d2a44;
    --text: #e6edf8;
    --muted: #9fb0c9;
    --border: #2a3a57;
    --primary: #60a5fa;
    --primary-strong: #3b82f6;
    --accent-soft: #1c315d;
    --control-bg: #13213b;
    --table-head: #1a2740;
    --shadow: 0 24px 56px rgba(3, 7, 18, 0.42);
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f172a;
  --bg-top: #111c34;
  --panel: #162033;
  --panel-soft: #19263d;
  --panel-strong: #1d2a44;
  --text: #e6edf8;
  --muted: #9fb0c9;
  --border: #2a3a57;
  --primary: #60a5fa;
  --primary-strong: #3b82f6;
  --accent-soft: #1c315d;
  --control-bg: #13213b;
  --table-head: #1a2740;
  --shadow: 0 24px 56px rgba(3, 7, 18, 0.42);
}

:root[data-theme="light"] {
  color-scheme: light;
}

* { box-sizing: border-box; }
html, body { min-height: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans TC', sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, var(--bg-top) 0%, var(--bg) 100%);
}
.page-shell {
  max-width: 1120px;
  margin: 0 auto;
  padding: 32px 20px 56px;
}
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  border-radius: 24px;
  padding: 28px;
  margin-bottom: 24px;
}
.section-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}
.hero {
  padding-top: 24px;
}
.hero-main {
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.hero-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
}
.eyebrow {
  display: inline-block;
  margin-bottom: 12px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
}
h1, h2, h3 { margin-top: 0; }
.hero-text, .section-head p, .hint, .block-head p {
  color: var(--muted);
  line-height: 1.7;
}
.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-content: flex-start;
  justify-content: flex-end;
}
.badge {
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--panel-strong);
  border: 1px solid var(--border);
  font-weight: 600;
}
.theme-toolbar {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  flex: 0 0 auto;
}
.theme-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
}
.theme-toggle {
  display: inline-grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--control-bg);
  gap: 4px;
}
.theme-option {
  min-width: 68px;
  border: 0;
  border-radius: 10px;
  padding: 9px 12px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 0.16s ease, color 0.16s ease, box-shadow 0.16s ease;
}
.theme-option.is-selected {
  background: var(--panel-strong);
  color: var(--text);
  box-shadow: 0 2px 10px rgba(15, 23, 42, 0.10);
}
.stack-form {
  display: grid;
  gap: 20px;
}
.form-block {
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 20px;
  background: var(--panel-soft);
}
.block-head {
  margin-bottom: 16px;
}
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
.param-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.date-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.full-span { grid-column: 1 / -1; }
.field-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.check-card, .hint-card {
  justify-content: center;
  border: 1px dashed var(--border);
  border-radius: 14px;
  padding: 14px 16px;
  background: var(--panel-strong);
}
.inline-check {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
}
input[type="file"], input[type="text"], input[type="number"], input[type="date"], select {
  width: 100%;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--panel-strong);
  color: var(--text);
}
.theme-option:focus-visible,
input[type="file"]:focus-visible,
input[type="text"]:focus-visible,
input[type="number"]:focus-visible,
input[type="date"]:focus-visible,
select:focus-visible,
.btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}
.btn {
  border: none;
  border-radius: 14px;
  padding: 12px 16px;
  font-weight: 700;
  cursor: pointer;
  transition: opacity 0.14s ease, transform 0.14s ease;
}
.btn:hover {
  transform: translateY(-1px);
}
.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, #3b82f6 100%);
  color: white;
}
.btn-secondary {
  background: var(--panel-strong);
  color: var(--text);
  border: 1px solid var(--border);
}
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.status-card {
  border-radius: 18px;
  padding: 16px 18px;
  border: 1px solid var(--border);
  background: var(--panel-strong);
  font-weight: 700;
}
.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}
.result-panel {
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 16px;
  background: var(--panel-soft);
}
pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 18px;
}
table {
  width: 100%;
  border-collapse: collapse;
}
th, td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
th {
  background: var(--table-head);
}
.section-gap {
  margin-top: 18px;
}
.hidden { display: none !important; }
@media (max-width: 900px) {
  .section-head {
    flex-direction: column;
  }
  .hero-top {
    flex-direction: column;
  }
  .theme-toolbar {
    align-items: flex-start;
  }
  .hero, .result-grid { grid-template-columns: 1fr; display: grid; }
  .param-grid, .date-grid { grid-template-columns: 1fr; }
}