:root {
  /* Backgrounds */
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --bg-elevated: #30363d;

  /* Text */
  --text-primary: #f0f6fc;
  --text-secondary: #8b949e;
  --text-muted: #484f58;

  /* Accent Colors */
  --accent-primary: #58a6ff;
  --accent-hover: #79c0ff;

  /* Status Colors */
  --success: #3fb950;
  --success-bg: rgba(63, 185, 80, 0.15);
  --warning: #d29922;
  --warning-bg: rgba(210, 153, 34, 0.15);
  --error: #f85149;
  --error-bg: rgba(248, 81, 73, 0.15);
  --info: #58a6ff;
  --info-bg: rgba(88, 166, 255, 0.15);

  /* Borders */
  --border-default: #30363d;
  --border-hover: #8b949e;
  --border-focus: #58a6ff;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);

  /* Chart Colors */
  --chart-1: #58a6ff;
  --chart-2: #3fb950;
  --chart-3: #d29922;
  --chart-4: #f85149;
  --chart-5: #a371f7;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
}

/* Layout */
.app-container {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 260px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-default);
}

.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.header {
  height: 60px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-default);
}

.content {
  flex: 1;
  padding: 24px;
  overflow-y: auto;
}

/* Cards */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: 8px;
  padding: 20px;
}

.card-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

/* Buttons */
.btn {
  padding: 8px 16px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent-primary);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-default);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-elevated);
  border-color: var(--border-hover);
}

.btn-danger {
  background: var(--error);
  color: white;
}

.btn-danger:hover:not(:disabled) {
  background: #da3633;
}

.btn-success {
  background: var(--success);
  color: white;
}

.btn-success:hover:not(:disabled) {
  background: #2ea043;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
}

.btn-lg {
  padding: 12px 24px;
  font-size: 16px;
}

/* Forms */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  margin-bottom: 6px;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.2);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-muted);
}

.form-error {
  color: var(--error);
  font-size: 12px;
  margin-top: 4px;
}

.form-help {
  color: var(--text-muted);
  font-size: 12px;
  margin-top: 4px;
}

/* Tables */
.table {
  width: 100%;
  border-collapse: collapse;
}

.table th,
.table td {
  padding: 12px;
  text-align: left;
  border-bottom: 1px solid var(--border-default);
}

.table th {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 14px;
}

.table tr:hover {
  background: var(--bg-tertiary);
}

.table-striped tbody tr:nth-child(odd) {
  background: var(--bg-tertiary);
}

.table-bordered {
  border: 1px solid var(--border-default);
}

.table-bordered th,
.table-bordered td {
  border: 1px solid var(--border-default);
}

/* Status badges */
.badge {
  display: inline-block;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
}

.badge-success {
  background: var(--success-bg);
  color: var(--success);
}

.badge-warning {
  background: var(--warning-bg);
  color: var(--warning);
}

.badge-error {
  background: var(--error-bg);
  color: var(--error);
}

.badge-info {
  background: var(--info-bg);
  color: var(--info);
}

/* Progress bar */
.progress {
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--accent-primary);
  transition: width 0.3s;
}

.progress-bar-success {
  background: var(--success);
}

.progress-bar-warning {
  background: var(--warning);
}

.progress-bar-error {
  background: var(--error);
}

/* Grid */
.grid {
  display: grid;
  gap: 20px;
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 1200px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

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

/* Stats card */
.stat-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: 8px;
  padding: 20px;
}

.stat-value {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 14px;
}

.stat-change {
  font-size: 12px;
  margin-top: 8px;
}

.stat-change.positive {
  color: var(--success);
}

.stat-change.negative {
  color: var(--error);
}

/* Loading spinner */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-default);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(13, 17, 23, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.loading-content {
  text-align: center;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border-default);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 16px;
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 60px 20px;
}

.empty-state-icon {
  font-size: 48px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.empty-state-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.empty-state-description {
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* Utilities */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-primary { color: var(--text-primary); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-error { color: var(--error); }

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.ml-1 { margin-left: 8px; }
.ml-2 { margin-left: 16px; }
.mr-1 { margin-right: 8px; }
.mr-2 { margin-right: 16px; }

.p-1 { padding: 8px; }
.p-2 { padding: 16px; }
.p-3 { padding: 24px; }
.p-4 { padding: 32px; }

.flex { display: flex; }
.flex-1 { flex: 1; }
.flex-between { justify-content: space-between; }
.flex-center {
  align-items: center;
  justify-content: center;
}
.flex-column { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }

/* Auth pages */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  padding: 20px;
}

.auth-container {
  width: 100%;
  max-width: 440px;
}

.auth-header {
  text-align: center;
  margin-bottom: 32px;
}

.auth-logo {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  display: block;
}

.auth-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.auth-subtitle {
  color: var(--text-secondary);
  font-size: 16px;
}

.auth-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: 12px;
  padding: 32px;
}

.auth-card .form-group {
  margin-bottom: 20px;
}

.auth-card .form-input {
  padding: 14px 16px;
  font-size: 16px;
}

.auth-card .btn {
  padding: 14px 24px;
  font-size: 16px;
  width: 100%;
}

.auth-footer {
  text-align: center;
  margin-top: 24px;
  color: var(--text-secondary);
  font-size: 15px;
}

.auth-footer a {
  color: var(--accent-primary);
  text-decoration: none;
}

.auth-footer a:hover {
  text-decoration: underline;
}

.w-full { width: 100%; }
.h-full { height: 100%; }

.hidden { display: none; }
.block { display: block; }
.inline { display: inline; }
.inline-block { display: inline-block; }

.rounded { border-radius: 6px; }
.rounded-full { border-radius: 9999px; }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }
.overflow-y-auto { overflow-y: auto; }

.cursor-pointer { cursor: pointer; }
.cursor-not-allowed { cursor: not-allowed; }

.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }

/* Markdown content */
.markdown-body {
  line-height: 1.7;
  color: var(--text-primary);
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  margin-top: 24px;
  margin-bottom: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.markdown-body h1 { font-size: 1.75em; }
.markdown-body h2 { font-size: 1.5em; border-bottom: 1px solid var(--border-default); padding-bottom: 8px; }
.markdown-body h3 { font-size: 1.25em; }
.markdown-body h4 { font-size: 1em; }

.markdown-body p {
  margin-bottom: 16px;
}

.markdown-body li {
  margin-left: 24px;
  margin-bottom: 8px;
}

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

.markdown-body em {
  font-style: italic;
}

.markdown-body table {
  border-collapse: collapse;
  width: 100%;
  margin: 16px 0;
}

.markdown-body th,
.markdown-body td {
  border: 1px solid var(--border-default);
  padding: 10px 12px;
  text-align: left;
}

.markdown-body th {
  background: var(--bg-tertiary);
  font-weight: 600;
}

/* Responsive */
@media (max-width: 768px) {
  .app-container {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border-default);
  }

  .content {
    padding: 16px;
  }
}