:root {
  --bg: #fafafa;
  --card-bg: #fff;
  --text: #1a1a1a;
  --text-secondary: #666;
  --border: #e5e7eb;
  --accent: #2563eb;
  --accent-light: #dbeafe;
  --header-bg: #fff;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111113;
    --card-bg: #1c1c1f;
    --text: #e4e4e7;
    --text-secondary: #a1a1aa;
    --border: #27272a;
    --accent: #60a5fa;
    --accent-light: #1e2a3a;
    --header-bg: #1c1c1f;
    --shadow: 0 1px 3px rgba(0,0,0,0.3);
  }
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue",
    "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.top-bar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.top-bar h1 {
  font-size: 18px;
  font-weight: 600;
  white-space: nowrap;
}

.date-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.date-nav button {
  width: 32px;
  height: 32px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  color: var(--text);
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}

.date-nav button:hover { background: var(--accent-light); }
.date-nav button:disabled { opacity: 0.3; cursor: default; }
.date-nav button:disabled:hover { background: var(--card-bg); }

.date-nav select {
  height: 32px;
  padding: 0 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  color: var(--text);
  font-size: 14px;
  cursor: pointer;
  outline: none;
  max-width: 160px;
}

.report-body {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 20px 80px;
}

.loading {
  text-align: center;
  color: var(--text-secondary);
  padding: 60px 0;
  font-size: 15px;
}

.error-msg {
  text-align: center;
  color: var(--accent);
  padding: 60px 0;
  font-size: 15px;
}

/* Markdown content styles */
.report-body h1 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent);
}

.report-body h2 {
  font-size: 18px;
  font-weight: 600;
  margin: 28px 0 12px;
  color: var(--accent);
}

.report-body h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 20px 0 8px;
}

.report-body p {
  margin-bottom: 12px;
  font-size: 15px;
}

.report-body ul, .report-body ol {
  margin-bottom: 12px;
  padding-left: 20px;
}

.report-body li {
  margin-bottom: 6px;
  font-size: 15px;
}

.report-body strong {
  color: var(--text);
  font-weight: 600;
}

.report-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 24px 0;
}

.report-body em {
  color: var(--text-secondary);
  font-size: 13px;
}

.report-body blockquote {
  border-left: 3px solid var(--accent);
  padding: 8px 16px;
  margin: 12px 0;
  background: var(--accent-light);
  border-radius: 0 8px 8px 0;
  font-size: 14px;
  color: var(--text-secondary);
}

@media (max-width: 480px) {
  .top-bar {
    flex-direction: column;
    gap: 8px;
    padding: 10px 16px;
  }
  .top-bar h1 { font-size: 16px; }
  .report-body { padding: 16px 14px 60px; }
  .report-body h1 { font-size: 20px; }
  .report-body h2 { font-size: 16px; }
  .report-body p, .report-body li { font-size: 14px; }
}