:root {
  --bg: #f5f6f8;
  --card: #fff;
  --text: #1a1a2e;
  --muted: #6b7280;
  --line: #e2e5ea;
  --blue: #2563eb;
  --blue-bg: #eef2ff;
  --green: #059669;
  --red: #dc2626;
  --red-bg: #fef2f2;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.08);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

.page { max-width: 520px; margin: 0 auto; padding: 16px; }

@media (min-width: 768px) {
  .page { max-width: 640px; padding: 24px; }
}

/* ── Header ── */
.header { margin-bottom: 16px; }
.header h1 { font-size: 28px; font-weight: 800; }

/* ── Pickers ── */
.pickers { display: flex; gap: 10px; margin-bottom: 16px; }
.picker { flex: 1; position: relative; }
@media (max-width: 419px) {
  .pickers { flex-direction: column; }
}

.picker-btn {
  display: flex; align-items: center; gap: 4px;
  width: 100%; padding: 8px 10px;
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 15px; cursor: pointer; user-select: none;
  text-align: left;
}
.picker-btn:disabled { opacity: .5; cursor: default; }
.picker-val { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.picker-arrow { font-size: 10px; color: var(--muted); flex-shrink: 0; }

.picker-menu {
  position: absolute; top: 100%; left: 0; right: 0; z-index: 20;
  margin-top: 2px;
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: 0 4px 12px rgba(0,0,0,.12);
  max-height: 260px; overflow-y: auto;
}
.picker-menu[hidden] { display: none; }

.picker-option {
  display: block; width: 100%; padding: 10px 12px;
  background: none; border: none;
  font-size: 15px; text-align: left; cursor: pointer;
}
.picker-option:hover { background: var(--blue-bg); }
.picker-option[aria-selected="true"] { background: var(--blue-bg); color: var(--blue); font-weight: 700; }

/* ── Notes ── */
.notes {
  padding: 14px; margin-bottom: 16px;
  background: #eef2ff; border: 1px solid #c7d2fe;
  border-radius: var(--radius);
  font-size: 12px; line-height: 1.5;
}
.notes h2 { font-size: 12px; color: var(--muted); margin-bottom: 6px; }
.notes ol { margin: 0; padding-left: 18px; }
.notes li { margin-bottom: 4px; }

/* ── Card section ── */
.card-section { margin-bottom: 12px; }

.card-row { margin-bottom: 10px; }
.card-input {
  display: block; width: 100%; padding: 12px 14px;
  font-size: 16px; border: 1px solid var(--line);
  border-radius: var(--radius); background: var(--card);
  outline: none;
}
.card-input:focus { border-color: var(--blue); box-shadow: 0 0 0 2px rgba(37,99,235,.15); }

.actions {
  display: grid; grid-template-columns: 1fr 1fr; gap: 8px;
}

.btn {
  padding: 12px 8px; border: 1px solid var(--line);
  border-radius: var(--radius); background: var(--card);
  font-size: 14px; font-weight: 600; cursor: pointer; user-select: none;
  transition: background .15s, opacity .15s;
}
.btn:active { background: #f0f0f0; }
.btn:disabled { opacity: .4; cursor: default; }
.btn-primary { background: var(--blue); color: #fff; border-color: var(--blue); }
.btn-primary:active { background: #1d4ed8; }
.btn-danger { color: var(--red); border-color: var(--red); }
.btn-danger:active { background: var(--red-bg); }

@media (min-width: 420px) {
  .actions { grid-template-columns: repeat(4, 1fr); }
  .card-input { font-size: 18px; padding: 14px 16px; }
  .btn { font-size: 15px; padding: 14px 8px; }
}

/* ── Notice ── */
.notice {
  padding: 10px 14px; margin-bottom: 12px;
  border-radius: var(--radius);
  font-size: 14px; background: #f0fdf4; color: var(--green); border: 1px solid #bbf7d0;
}
.notice.error { background: var(--red-bg); color: var(--red); border-color: #fecaca; }
.notice[hidden] { display: none; }

/* ── Status ── */
.status-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 8px;
}
.tile {
  padding: 12px; background: var(--card);
  border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.tile span { display: block; font-size: 12px; color: var(--muted); margin-bottom: 4px; }
.tile strong { font-size: 16px; font-weight: 700; word-break: break-all; }
.tile.wide { grid-column: 1 / -1; }
.code-txt { font-family: "SF Mono", monospace; font-size: 20px; color: var(--red); }

@media (min-width: 420px) {
  .tile { padding: 14px; }
  .tile strong { font-size: 18px; }
}

/* ── Footer ── */
.footer-links {
  margin-top: 20px; padding-top: 12px;
  border-top: 1px solid var(--line);
  display: flex; flex-wrap: wrap; align-items: center; gap: 12px;
  font-size: 14px;
}
.link { color: var(--blue); text-decoration: none; }
.link:hover { text-decoration: underline; }
.link-danger { color: var(--red); }
.passrate { color: var(--muted); margin-left: auto; font-size: 13px; }
.passrate strong { color: var(--green); font-weight: 700; }

@media (max-width: 419px) {
  .footer-links { flex-direction: column; align-items: flex-start; gap: 6px; }
  .passrate { margin-left: 0; }
}

/* 注意事项换行 */
#notesContent {
  white-space: pre-wrap;
}