:root {
  --bg: #f4f6f8;
  --surface: #ffffff;
  --ink: #1f2933;
  --muted: #52606d;
  --line: #d9e2ec;
  --accent: #0f6e56;
  --accent-soft: #e1f5ee;
  --warn: #8a6116;
  --warn-bg: #fff7e6;
  --danger-soft: #ffe8e6;
  --focus: #2680c2;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 8px 24px rgba(16, 24, 40, 0.06);
  font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light;
}

body {
  margin: 0;
  background: linear-gradient(180deg, #eef2f6 0%, var(--bg) 240px);
  color: var(--ink);
  line-height: 1.6;
}

a {
  color: var(--accent);
}

.wrap {
  max-width: 880px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}

.banner {
  background: var(--warn-bg);
  border: 1px solid #f0d9a8;
  color: var(--warn);
  border-radius: var(--radius);
  padding: 12px 14px;
  margin-bottom: 16px;
  font-size: 0.95rem;
}

header.hero {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 4px);
  box-shadow: var(--shadow);
  padding: 24px 22px;
  margin-bottom: 20px;
}

header.hero h1 {
  margin: 0 0 8px;
  font-size: 1.55rem;
  letter-spacing: 0.01em;
}

header.hero .sub {
  margin: 0;
  color: var(--muted);
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.badge {
  display: inline-block;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 0.82rem;
  font-weight: 600;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 18px 16px;
  margin-bottom: 16px;
}

.panel h2 {
  margin: 0 0 10px;
  font-size: 1.15rem;
}

.muted {
  color: var(--muted);
  margin: 0 0 12px;
}

.symptom-list {
  display: grid;
  gap: 10px;
}

.symptom-card {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto;
  column-gap: 10px;
  row-gap: 2px;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px;
  cursor: pointer;
  background: #fafbfc;
}

.symptom-card:hover {
  border-color: #bcccdc;
}

.symptom-card:focus-within {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.symptom-card input {
  grid-row: 1 / span 2;
  margin-top: 4px;
  width: 18px;
  height: 18px;
}

.symptom-title {
  font-weight: 700;
}

.symptom-hint {
  grid-column: 2;
  color: var(--muted);
  font-size: 0.92rem;
}

.diff-hint {
  margin-top: 12px;
  padding: 12px;
  background: #e6f2ff;
  border-radius: 10px;
  border: 1px solid #c5dff5;
  color: #243b53;
  font-size: 0.92rem;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.progress {
  font-size: 0.92rem;
  color: var(--muted);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

button {
  font: inherit;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  padding: 8px 12px;
  cursor: pointer;
}

button:hover {
  background: #f0f4f8;
}

button:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

button.primary:hover {
  filter: brightness(0.95);
}

button.danger {
  background: var(--danger-soft);
  border-color: #f5c6c2;
  color: #9b1c1c;
}

.step-group + .step-group {
  margin-top: 18px;
  padding-top: 8px;
  border-top: 1px dashed var(--line);
}

.step-group h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.step-list {
  margin: 0;
  padding-left: 1.2rem;
}

.step-item {
  margin-bottom: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fcfdff;
}

.step-item[data-status="checked"] {
  background: var(--accent-soft);
  border-color: #b8e0d2;
}

.step-item[data-status="na"] {
  opacity: 0.78;
}

.step-head {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.status-select {
  font: inherit;
  padding: 4px 8px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: #fff;
}

.step-detail {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

textarea {
  width: 100%;
  min-height: 96px;
  resize: vertical;
  font: inherit;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fff;
}

.save-hint {
  margin: 8px 0 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.export-preview {
  margin-top: 12px;
  border: 1px dashed #9fb3c8;
  border-radius: 10px;
  background: #f8fafc;
  padding: 12px;
}

.export-preview pre {
  white-space: pre-wrap;
  word-break: break-word;
  margin: 8px 0 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85rem;
  color: #334e68;
}

footer.site-foot {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.88rem;
}

@media (max-width: 560px) {
  header.hero h1 {
    font-size: 1.3rem;
  }
  .step-head {
    align-items: flex-start;
  }
  .status-select {
    width: 100%;
  }
}