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

:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #a5b4fc;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--gray-50);
  color: var(--gray-800);
  min-height: 100vh;
}

/* Navbar */
.navbar {
  background: #fff;
  border-bottom: 1px solid var(--gray-200);
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}
.nav-left { display: flex; align-items: center; gap: 32px; }
.nav-right { display: flex; align-items: center; gap: 12px; }
.nav-brand { font-size: 18px; font-weight: 700; color: var(--primary); text-decoration: none; }
.nav-links { display: flex; gap: 8px; }
.nav-links a { color: var(--gray-600); text-decoration: none; padding: 8px 12px; border-radius: var(--radius); font-size: 14px; }
.nav-links a:hover { background: var(--gray-100); color: var(--gray-900); }
.nav-user { font-size: 14px; color: var(--gray-600); padding: 0 8px; }

/* Container */
.container { max-width: 1200px; margin: 0 auto; padding: 24px; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 6px; padding: 8px 16px;
  border-radius: var(--radius); font-size: 14px; font-weight: 500;
  border: 1px solid var(--gray-300); background: #fff; color: var(--gray-700);
  cursor: pointer; text-decoration: none; transition: all 0.15s;
}
.btn:hover { background: var(--gray-50); border-color: var(--gray-400); }
.btn-sm { padding: 4px 12px; font-size: 13px; }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); }
.btn-success { background: var(--success); color: #fff; border-color: var(--success); }
.btn-success:hover { background: #059669; }
.btn-danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn-danger:hover { background: #dc2626; }
.btn-warning { background: var(--warning); color: #fff; border-color: var(--warning); }
.btn-outline { background: transparent; border: 1px solid var(--gray-300); }
.btn-outline:hover { background: var(--gray-100); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* Cards */
.card {
  background: #fff; border-radius: var(--radius); box-shadow: var(--shadow);
  border: 1px solid var(--gray-200); padding: 24px; margin-bottom: 16px;
}
.card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.card-title { font-size: 18px; font-weight: 600; }

/* Form */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 14px; font-weight: 500; color: var(--gray-700); margin-bottom: 4px; }
.form-input, .form-select, .form-textarea {
  width: 100%; padding: 8px 12px; border: 1px solid var(--gray-300);
  border-radius: var(--radius); font-size: 14px; outline: none; transition: border-color 0.15s;
}
.form-input:focus, .form-select:focus, .form-textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(99,102,241,0.1); }
.form-textarea { min-height: 100px; resize: vertical; font-family: monospace; }
.form-hint { font-size: 12px; color: var(--gray-400); margin-top: 4px; }

/* Table */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--gray-200); font-size: 14px; }
th { background: var(--gray-50); font-weight: 600; color: var(--gray-600); }
tr:hover { background: var(--gray-50); }

/* Tags / Badges */
.tag {
  display: inline-block; padding: 2px 8px; border-radius: 12px; font-size: 12px; font-weight: 500;
}
.tag-blue { background: #eef2ff; color: var(--primary); }
.tag-green { background: #ecfdf5; color: var(--success); }
.tag-yellow { background: #fffbeb; color: var(--warning); }
.tag-red { background: #fef2f2; color: var(--danger); }
.tag-gray { background: var(--gray-100); color: var(--gray-500); }

/* Status */
.status-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 6px; }
.status-dot.green { background: var(--success); }
.status-dot.yellow { background: var(--warning); }
.status-dot.red { background: var(--danger); }
.status-dot.gray { background: var(--gray-400); }
.status-dot.blue { background: var(--primary); }

/* Toast */
.toast {
  position: fixed; bottom: 24px; right: 24px; padding: 12px 24px;
  border-radius: var(--radius); background: var(--gray-800); color: #fff;
  font-size: 14px; z-index: 1000; opacity: 0; transform: translateY(20px);
  transition: all 0.3s; pointer-events: none;
}
.toast.show { opacity: 1; transform: translateY(0); }
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }

/* Grid */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
.grid-4 { display: grid; grid-template-columns: 1fr 1fr 1fr 1fr; gap: 16px; }

/* Stat card */
.stat-card { text-align: center; padding: 20px; }
.stat-card .num { font-size: 32px; font-weight: 700; color: var(--primary); }
.stat-card .label { font-size: 14px; color: var(--gray-500); margin-top: 4px; }

/* Modal */
.modal-overlay {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5); z-index: 200; display: none;
  align-items: center; justify-content: center;
}
.modal-overlay.show { display: flex; }
.modal {
  background: #fff; border-radius: var(--radius); padding: 24px;
  max-width: 500px; width: 90%; max-height: 80vh; overflow-y: auto;
  box-shadow: var(--shadow-md);
}
.modal-title { font-size: 18px; font-weight: 600; margin-bottom: 16px; }
.modal-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 16px; }

/* Empty state */
.empty-state { text-align: center; padding: 60px 20px; color: var(--gray-400); }
.empty-state .icon { font-size: 48px; margin-bottom: 12px; }
.empty-state p { font-size: 16px; }

/* Page header */
.page-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.page-header h1 { font-size: 24px; font-weight: 700; }

/* Tabs */
.tabs { display: flex; gap: 0; border-bottom: 1px solid var(--gray-200); margin-bottom: 24px; }
.tab { padding: 10px 20px; cursor: pointer; border-bottom: 2px solid transparent;
  font-size: 14px; color: var(--gray-500); transition: all 0.15s; }
.tab:hover { color: var(--gray-700); }
.tab.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }

/* Stepper */
.stepper { display: flex; align-items: flex-start; gap: 0; margin: 24px 0; }
.step { flex: 1; text-align: center; position: relative; }
.step .step-num { width: 32px; height: 32px; border-radius: 50%; display: inline-flex;
  align-items: center; justify-content: center; font-size: 14px; font-weight: 600;
  background: var(--gray-200); color: var(--gray-500); margin-bottom: 8px; }
.step.active .step-num { background: var(--primary); color: #fff; }
.step.done .step-num { background: var(--success); color: #fff; }
.step.fail .step-num { background: var(--danger); color: #fff; }
.step .step-label { font-size: 12px; color: var(--gray-500); }
.step.active .step-label { color: var(--primary); font-weight: 600; }
.step + .step::before { content: ''; position: absolute; top: 16px; left: -50%;
  width: 100%; height: 2px; background: var(--gray-200); z-index: -1; }
.step.done + .step::before { background: var(--success); }

/* Login page */
.auth-page { display: flex; align-items: center; justify-content: center; min-height: calc(100vh - 120px); padding: 20px; }
.auth-card { width: 100%; max-width: 420px; }
.auth-card .card { padding: 40px; }
.auth-card h2 { text-align: center; margin-bottom: 8px; font-size: 24px; }
.auth-card .form-footer { text-align: center; margin-top: 16px; font-size: 14px; color: var(--gray-500); }
.auth-card .form-footer a { color: var(--primary); text-decoration: none; }
.auth-card .form-input { padding: 10px 12px; }
.auth-card .btn { padding: 10px; font-size: 15px; }

/* Upload area */
.upload-zone {
  border: 2px dashed var(--gray-300); border-radius: var(--radius);
  padding: 40px; text-align: center; cursor: pointer; transition: all 0.15s;
}
.upload-zone:hover { border-color: var(--primary); background: var(--gray-50); }
.upload-zone .icon { font-size: 48px; color: var(--gray-400); margin-bottom: 12px; }
.upload-zone p { color: var(--gray-500); font-size: 14px; }

/* Progress bar */
.progress-bar { height: 8px; background: var(--gray-200); border-radius: 4px; overflow: hidden; margin: 12px 0; }
.progress-bar .fill { height: 100%; background: var(--primary); border-radius: 4px; transition: width 0.3s; }

/* Alert */
.alert { padding: 12px 16px; border-radius: var(--radius); font-size: 14px; margin-bottom: 16px; }
.alert-info { background: #eef2ff; color: var(--primary); border: 1px solid var(--primary-light); }
.alert-success { background: #ecfdf5; color: var(--success); border: 1px solid #a7f3d0; }
.alert-danger { background: #fef2f2; color: var(--danger); border: 1px solid #fecaca; }
.alert-warning { background: #fffbeb; color: var(--warning); border: 1px solid #fde68a; }

/* Flex */
.flex { display: flex; }
.flex-1 { flex: 1; }
.gap-2 { gap: 8px; }
.gap-4 { gap: 16px; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }
.text-center { text-align: center; }
.text-sm { font-size: 13px; }
.text-muted { color: var(--gray-500); }

/* Code block */
.code-block { background: var(--gray-800); color: #e5e7eb; padding: 16px; border-radius: var(--radius);
  font-family: 'Courier New', monospace; font-size: 13px; overflow-x: auto; white-space: pre-wrap; }

/* Detail row */
.detail-row { display: flex; padding: 8px 0; border-bottom: 1px solid var(--gray-100); }
.detail-row .label { width: 140px; flex-shrink: 0; color: var(--gray-500); font-size: 14px; }
.detail-row .value { flex: 1; font-size: 14px; }

/* Responsive */
@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .page-header { flex-direction: column; gap: 12px; align-items: stretch; }
  .stepper { flex-direction: column; gap: 8px; }
  .step + .step::before { display: none; }
}