/* Base Design */
:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary: #64748b;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-muted: #94a3b8;
    --sidebar-bg: #1e293b;
    --border: #e2e8f0;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    margin: 0;
    line-height: 1.5;
}

/* Typography */
h1, h2, h3, h4 {
    margin: 0;
    font-weight: 600;
}

a {
    text-decoration: none;
    color: inherit;
}

/* Layout */
.dashboard-layout {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    color: white;
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    box-sizing: border-box;
}

.brand {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    color: #60a5fa;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    color: #cbd5e1;
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
    transition: all 0.2s;
}

.nav-link:hover, .nav-link.active {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
}

.user-profile {
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid #334155;
    font-size: 0.875rem;
    color: #94a3b8;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
    background-color: var(--bg-main);
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

/* Cards & Grid */
.card {
    background: var(--bg-card);
    border-radius: 0.75rem;
    padding: 1.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--border);
    margin-bottom: 1.5rem;
}

.card-header {
    border-bottom: 1px solid var(--border);
    padding-bottom: 1rem;
    margin-bottom: 1rem;
}

.card-header h3 {
    margin: 0;
    font-size: 1.1rem;
}

.card-body {
    padding: 0;
}

.stat-card {
    border-left: 4px solid var(--primary);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0.5rem 0 0 0;
}

/* Forms */
.input-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

input, select, textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    background-color: #f8fafc;
    font-size: 0.9rem;
    box-sizing: border-box;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--primary);
    color: white;
    border-radius: 0.5rem;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: background 0.2s;
    text-decoration: none;
}

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

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

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

.btn-secondary:hover {
    background-color: #f1f5f9;
}

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

.btn-danger:hover {
    background-color: #dc2626;
}

.btn-block {
    width: 100%;
    display: block;
}

/* Tables */
.table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 0;
}

th {
    text-align: left;
    padding: 1rem;
    background-color: #f8fafc;
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.8rem;
    text-transform: uppercase;
}

td {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    font-size: 0.9rem;
}

tr:last-child td {
    border-bottom: none;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-low { background: #dbeafe; color: #1e40af; }
.badge-medium { background: #fef3c7; color: #92400e; }
.badge-high { background: #fecaca; color: #7f1d1d; }
.badge-critical { background: #fca5a5; color: #7f1d1d; }
.badge-todo { background: #e2e8f0; color: #334155; }
.badge-in_progress { background: #bfdbfe; color: #1e40af; }
.badge-review { background: #fcd34d; color: #92400e; }
.badge-done { background: #bbf7d0; color: #065f46; }
.badge-planned { background: #e2e8f0; color: #334155; }
.badge-active { background: #bbf7d0; color: #065f46; }
.badge-completed { background: #87e8de; color: #0d3b66; }
.badge-on_hold { background: #fecaca; color: #7f1d1d; }
.badge-success { background: #dcfce7; color: #166534; }
.badge-danger { background: #fee2e2; color: #991b1b; }

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 0.75rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    font-size: 0.9rem;
}

.alert-error {
    background-color: #fef2f2;
    border: 1px solid #fee2e2;
    color: #991b1b;
}

.alert-success {
    background-color: #f0fdf4;
    border: 1px solid #dcfce7;
    color: #166534;
}

/* Login Page */
.login-page {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.login-container {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    width: 100%;
    max-width: 440px;
    padding: 3rem;
    border-radius: 1.5rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.login-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.logo-circle {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    box-shadow: 0 10px 15px -3px rgba(37, 99, 235, 0.3);
}

.login-header h1 {
    font-size: 1.75rem;
    color: #0f172a;
    margin-bottom: 0.5rem;
}

.login-header p {
    color: #64748b;
    font-size: 0.95rem;
}

.login-form {
    margin-top: 2rem;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    border: 1px solid #e2e8f0;
}

.stat-card h3 {
    color: #64748b;
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
    font-weight: 500;
    text-transform: uppercase;
}

.stat-value {
    font-size: 1.875rem;
    font-weight: 700;
    color: #0f172a;
    margin: 0;
}

/* Responsive */
@media (max-width: 768px) {
    .dashboard-layout {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        flex-direction: row;
        padding: 1rem;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}