:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --sidebar-bg: #1e293b;
    --sidebar-hover: #334155;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    overflow-x: hidden;
}

/* Auth Pages */
.auth-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.auth-card {
    width: 100%;
    max-width: 450px;
    background: var(--card-bg);
    border-radius: 1rem;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    padding: 2.5rem;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    padding: 0.625rem 1.25rem;
    font-weight: 600;
    border-radius: 0.5rem;
    transition: all 0.2s;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    transform: translateY(-1px);
}

.form-control {
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    border: 1px solid #e2e8f0;
}

.form-control:focus {
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    border-color: var(--primary-color);
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    min-height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
    transition: all 0.3s;
    z-index: 1000;
}

.main-content {
    margin-left: 260px;
    padding: 2rem;
    transition: all 0.3s;
}

.nav-link {
    color: #cbd5e1;
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-left: 4px solid transparent;
}

.nav-link:hover, .nav-link.active {
    background-color: var(--sidebar-hover);
    color: #fff;
    border-left-color: var(--primary-color);
}

.card {
    border: none;
    border-radius: 1rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.stat-card {
    transition: transform 0.2s;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.badge-new { background-color: var(--primary-color); }
.badge-contacted { background-color: var(--warning-color); }
.badge-closed { background-color: var(--success-color); }

/* QR Code Modal */
#qrImage {
    max-width: 300px;
    margin: 0 auto;
    display: block;
}

@media (max-width: 991.98px) {
    .sidebar { margin-left: -260px; }
    .sidebar.show { margin-left: 0; }
    .main-content { margin-left: 0; }
}