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

:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary: #64748b;
  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;
  --bg: #f8fafc;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --text-light: #64748b;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.1);
}

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

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

.btn { display: inline-block; padding: 8px 16px; border: none; border-radius: var(--radius); font-size: 14px; font-weight: 500; cursor: pointer; transition: all 0.2s; text-align: center; }
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-hover); text-decoration: none; }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-outline:hover { background: var(--bg); text-decoration: none; }
.btn-danger { background: var(--danger); color: white; }
.btn-block { display: block; width: 100%; }
.btn-sm { padding: 4px 12px; font-size: 12px; }

.app-header { display: flex; align-items: center; justify-content: space-between; padding: 12px 24px; background: var(--surface); border-bottom: 1px solid var(--border); box-shadow: var(--shadow); }
.header-brand h1 { font-size: 20px; }
.header-brand a { color: var(--text); }
.header-brand a:hover { text-decoration: none; }
.header-nav { display: flex; gap: 20px; }
.header-nav a { color: var(--text-light); font-weight: 500; }
.header-nav a:hover { color: var(--primary); text-decoration: none; }
.header-actions { display: flex; gap: 8px; }

.app-container { display: flex; min-height: calc(100vh - 57px - 48px); }

.sidebar { width: 240px; background: var(--surface); border-right: 1px solid var(--border); padding: 16px 0; flex-shrink: 0; }
.sidebar-nav { display: flex; flex-direction: column; }
.sidebar-link { display: block; padding: 10px 24px; color: var(--text-light); font-weight: 500; transition: all 0.2s; }
.sidebar-link:hover { background: var(--bg); color: var(--primary); text-decoration: none; }
.sidebar-link.active { color: var(--primary); background: #eff6ff; border-right: 3px solid var(--primary); }

.main-content { flex: 1; padding: 24px; max-width: 1200px; }

.app-footer { padding: 12px 24px; text-align: center; color: var(--text-light); font-size: 13px; border-top: 1px solid var(--border); background: var(--surface); }

/* Auth pages */
.auth-container { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: var(--bg); }
.auth-card { background: var(--surface); padding: 40px; border-radius: var(--radius); box-shadow: var(--shadow); width: 100%; max-width: 420px; }
.auth-card h2 { margin-bottom: 24px; text-align: center; }
.auth-links { margin-top: 16px; text-align: center; font-size: 14px; color: var(--text-light); }

.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 4px; font-weight: 500; font-size: 14px; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 8px 12px; border: 1px solid var(--border); border-radius: var(--radius); font-size: 14px; }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.1); }
.form-row { display: flex; gap: 12px; }
.form-row .form-group { flex: 1; }

/* Hero */
.hero { text-align: center; padding: 80px 24px; max-width: 1000px; margin: 0 auto; }
.hero h2 { font-size: 36px; margin-bottom: 16px; }
.hero p { font-size: 18px; color: var(--text-light); margin-bottom: 48px; }
.hero-features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; text-align: left; }
.feature-card { background: var(--surface); padding: 24px; border-radius: var(--radius); box-shadow: var(--shadow); }
.feature-card h3 { margin-bottom: 8px; color: var(--primary); }
.feature-card p { font-size: 14px; color: var(--text-light); }

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

/* Filters */
.filters-bar { display: flex; gap: 12px; margin-bottom: 20px; flex-wrap: wrap; }
.filters-bar select, .filters-bar input { padding: 8px 12px; border: 1px solid var(--border); border-radius: var(--radius); font-size: 14px; }
.search-input { width: 100%; padding: 12px; border: 1px solid var(--border); border-radius: var(--radius); font-size: 16px; margin-bottom: 24px; }

/* Tickets list */
.tickets-list { display: flex; flex-direction: column; gap: 8px; }
.ticket-item { display: flex; align-items: center; padding: 16px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); gap: 16px; cursor: pointer; transition: box-shadow 0.2s; }
.ticket-item:hover { box-shadow: var(--shadow); }
.ticket-id { font-weight: 600; color: var(--text-light); min-width: 60px; }
.ticket-subject { flex: 1; font-weight: 500; }
.ticket-meta { display: flex; gap: 8px; align-items: center; }

/* Status badges */
.badge { display: inline-block; padding: 2px 8px; border-radius: 12px; font-size: 12px; font-weight: 500; }
.badge-open { background: #dbeafe; color: #1d4ed8; }
.badge-in_progress { background: #fef3c7; color: #92400e; }
.badge-waiting_on_customer { background: #f3e8ff; color: #6b21a8; }
.badge-resolved { background: #dcfce7; color: #166534; }
.badge-closed { background: #f1f5f9; color: #475569; }
.badge-low { background: #f1f5f9; color: #475569; }
.badge-medium { background: #fef3c7; color: #92400e; }
.badge-high { background: #fee2e2; color: #991b1b; }
.badge-urgent { background: #fecaca; color: #dc2626; font-weight: 700; }

/* Panels */
.panel { background: var(--surface); padding: 20px; border-radius: var(--radius); border: 1px solid var(--border); }
.panel h3 { margin-bottom: 16px; font-size: 16px; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 24px; }
.stat-card { background: var(--surface); padding: 20px; border-radius: var(--radius); border: 1px solid var(--border); }
.stat-card .stat-value { font-size: 28px; font-weight: 700; color: var(--primary); }
.stat-card .stat-label { font-size: 13px; color: var(--text-light); margin-top: 4px; }
.dashboard-panels { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }

/* KB */
.kb-categories { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-bottom: 24px; }
.kb-articles { display: flex; flex-direction: column; gap: 12px; }

/* Profile */
.profile-card { background: var(--surface); padding: 24px; border-radius: var(--radius); border: 1px solid var(--border); margin-bottom: 24px; }

/* Admin */
.admin-sections { display: flex; flex-direction: column; gap: 24px; }

/* Error page */
.error-container { text-align: center; padding: 80px 24px; }
.error-container h1 { font-size: 72px; color: var(--primary); }
.error-container p { font-size: 18px; color: var(--text-light); margin: 16px 0 32px; }

/* Comment form */
.comment-form { margin-top: 24px; }
.comment-form textarea { width: 100%; padding: 12px; border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 12px; font-family: inherit; }

/* Responsive */
@media (max-width: 768px) {
  .hero-features, .stats-grid { grid-template-columns: 1fr; }
  .dashboard-panels { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .form-row { flex-direction: column; }
}