:root {
  --green-deep: #33593f;
  --primary: #4F464F;
  --primary-hover: #4338CA;
  --secondary: #6B7280;
  --bg: #F9FAFB;
  --surface: #FFFFFF;
  --text: #111827;
  --text-secondary: #6B7280;
  --success: #10B981;
  --warning: #F59E0B;
  --danger: #EF4444;
  --border: #E5E7EB;
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  --radius: 0.5rem;
  --max-width: 1200px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 1rem; }

header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 3.5rem;
}

.logo { font-size: 1.25rem; font-weight: 700; color: var(--primary); }

nav { display: flex; gap: 1.5rem; align-items: center; }
nav a { color: var(--text-secondary); font-size: 0.875rem; font-weight: 500; }
nav a:hover { color: var(--primary); text-decoration: none; }

main { min-height: calc(100vh - 3.5rem - 4rem); padding: 2rem 0; }

footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.card-body { padding: 1.5rem; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  border: none;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-secondary { background: var(--bg); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--border); }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: #DC2626; }
.btn-success { background: var(--success); color: white; }
.btn-success:hover { background: #059669; }
.btn-sm { padding: 0.375rem 0.75rem; font-size: 0.8125rem; }
.btn-lg { padding: 0.75rem 1.5rem; font-size: 1rem; }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }

.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.375rem; font-size: 0.875rem; font-weight: 500; }
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.875rem;
  transition: border-color 0.2s;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}
.form-group textarea { min-height: 120px; resize: vertical; }

.alert {
  padding: 0.875rem 1rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  margin-bottom: 1rem;
}
.alert-error { background: #FEF2F2; color: #991B1B; border: 1px solid #FECACA; }
.alert-success { background: #ECFDF5; color: #065F46; border: 1px solid #A7F3D0; }

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.625rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 500;
}
.badge-pending { background: #FEF3C7; color: #92400E; }
.badge-approved { background: #D1FAE5; color: #065F46; }
.badge-rejected { background: #FEE2E2; color: #991B1B; }
.badge-paid { background: #D1FAE5; color: #065F46; }
.badge-cancelled { background: #F3F4F6; color: #374151; }

.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-secondary);
}

.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem;
}
.spinner {
  width: 2rem;
  height: 2rem;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.grid { display: grid; gap: 1.5rem; }
.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

@media (min-width: 768px) {
  .md-grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
  .md-grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
  .md-grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
}

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-secondary { color: var(--text-secondary); }
.font-bold { font-weight: 700; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }
.text-3xl { font-size: 1.875rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.gap-4 { gap: 1rem; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.hidden { display: none !important; }

.article-card { transition: transform 0.2s, box-shadow 0.2s; }
.article-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.article-card img { width: 100%; height: 180px; object-fit: cover; }
.article-card .card-body { padding: 1rem; }

.price { color: var(--danger); font-weight: 700; font-size: 1.125rem; }
.price-free { color: var(--success); }

.tabs { display: flex; gap: 0.5rem; border-bottom: 1px solid var(--border); margin-bottom: 1.5rem; }
.tab { padding: 0.625rem 1rem; border-bottom: 2px solid transparent; cursor: pointer; font-size: 0.875rem; font-weight: 500; color: var(--text-secondary); }
.tab.active { color: var(--primary); border-bottom-color: var(--primary); }
.tab:hover { color: var(--primary); }

.pagination { display: flex; gap: 0.5rem; justify-content: center; margin-top: 2rem; }
.pagination button {
  padding: 0.5rem 0.875rem;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.875rem;
}
.pagination button.active { background: var(--primary); color: white; border-color: var(--primary); }
.pagination button:disabled { opacity: 0.5; cursor: not-allowed; }

input[type="file"] { padding: 0.5rem; }

img { max-width: 100%; }

.markdown-content h1, .markdown-content h2, .markdown-content h3 { margin: 1rem 0 0.5rem; }
.markdown-content p { margin-bottom: 0.75rem; }
.markdown-content img { max-width: 100%; border-radius: var(--radius); }
.markdown-content pre { background: #1F2937; color: #F9FAFB; padding: 1rem; border-radius: var(--radius); overflow-x: auto; margin: 1rem 0; }
.markdown-content code { background: #F3F4F6; padding: 0.125rem 0.375rem; border-radius: 0.25rem; font-size: 0.875rem; }
.markdown-content pre code { background: none; padding: 0; }
.markdown-content blockquote { border-left: 4px solid var(--primary); padding-left: 1rem; margin: 1rem 0; color: var(--text-secondary); }
.markdown-content ul, .markdown-content ol { margin: 0.5rem 0 0.5rem 1.5rem; }