:root {
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-hover: #fafbfc;
  --border: #e6e9ec;
  --text: #1a1a1a;
  --text-secondary: #555b63;
  --text-muted: #8a919b;
  --accent: #c85a2a;
  --accent-hover: #a84820;
  --header-bg: #1a1a1a;
  --header-text: #ffffff;
  --card-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --card-shadow-hover: 0 4px 12px rgba(0,0,0,0.1);
  --radius: 8px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

body {
  font-family: var(--font);
  background: #f7f8fa;
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

/* Header */
.site-header {
  background: var(--header-bg);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-title {
  color: var(--header-text);
  font-size: 1.1rem;
  font-weight: 700;
  text-decoration: none;
}

.site-nav {
  display: flex;
  gap: 1.5rem;
}

.site-nav a {
  color: rgba(255,255,255,0.75);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.15s;
}

.site-nav a:hover,
.site-nav a.active {
  color: #ffffff;
}

/* Main content */
main {
  flex: 1;
  padding: 2.5rem 0;
}

/* Page header */
.page-header {
  margin-bottom: 2rem;
}

.page-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.page-header p {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* Report cards */
.report-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--card-shadow);
  transition: box-shadow 0.2s, transform 0.2s;
}

.report-card:hover {
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-1px);
}

.report-card .card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.75rem;
}

.report-card .card-title {
  font-size: 1.1rem;
  font-weight: 600;
}

.report-card .card-title a {
  color: var(--text);
  text-decoration: none;
}

.report-card .card-title a:hover {
  color: var(--accent);
}

.report-card .card-date {
  color: var(--text-muted);
  font-size: 0.8rem;
  white-space: nowrap;
  margin-left: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.report-card .card-meta {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.report-card .badge {
  display: inline-flex;
  align-items: center;
  background: #f0f3f6;
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.2rem 0.6rem;
  border-radius: 12px;
}

/* Item list inside expanded card */
.report-items {
  border-top: 1px solid var(--border);
  padding-top: 1rem;
  margin-top: 0.5rem;
}

.report-items .category-group {
  margin-bottom: 1rem;
}

.report-items .category-group:last-child {
  margin-bottom: 0;
}

.report-items .category-name {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent);
  margin-bottom: 0.4rem;
}

.report-items ul {
  list-style: none;
}

.report-items li {
  padding: 0.4rem 0;
  font-size: 0.9rem;
}

.report-items li a {
  color: var(--text);
  text-decoration: none;
}

.report-items li a:hover {
  color: var(--accent);
  text-decoration: underline;
}

/* Archive list */
.archive-list {
  list-style: none;
}

.archive-list li {
  border-bottom: 1px solid var(--border);
}

.archive-list li:last-child {
  border-bottom: none;
}

.archive-list a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0.5rem;
  text-decoration: none;
  color: var(--text);
  transition: background 0.15s;
  border-radius: 4px;
}

.archive-list a:hover {
  background: var(--surface-hover);
}

.archive-list .archive-title {
  font-weight: 500;
  font-size: 0.95rem;
}

.archive-list .archive-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-shrink: 0;
  margin-left: 1rem;
}

.archive-list .archive-count {
  font-size: 0.8rem;
  color: var(--text-muted);
  background: #f0f3f6;
  padding: 0.15rem 0.5rem;
  border-radius: 10px;
}

.archive-list .archive-date {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

/* States */
.loading {
  text-align: center;
  padding: 3rem 0;
  color: var(--text-muted);
}

.loading::after {
  content: '';
  display: block;
  width: 24px;
  height: 24px;
  margin: 1rem auto 0;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.empty {
  text-align: center;
  padding: 3rem 0;
  color: var(--text-muted);
  font-style: italic;
}

.error {
  background: #fef0f0;
  border: 1px solid #f5c6c6;
  color: #a33;
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  margin: 1rem 0;
  font-size: 0.9rem;
}

/* Footer */
.site-footer {
  background: var(--header-bg);
  color: rgba(255,255,255,0.6);
  padding: 2rem 0;
  font-size: 0.85rem;
  text-align: center;
}

.site-footer a {
  color: rgba(255,255,255,0.8);
  text-decoration: none;
}

.site-footer a:hover {
  color: #fff;
}

.site-footer p + p {
  margin-top: 0.4rem;
}

/* Responsive */
@media (max-width: 600px) {
  .site-header .container {
    flex-direction: column;
    gap: 0.5rem;
  }
  .report-card .card-header {
    flex-direction: column;
    gap: 0.25rem;
  }
  .report-card .card-date {
    margin-left: 0;
  }
  .archive-list a {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }
  .archive-list .archive-meta {
    margin-left: 0;
  }
}