/* === Modern Kurumsal Tema === */
:root {
    --main-bg: #f4f6fb;
    --sidebar-bg: #1e293b;
    --sidebar-active: #2563eb;
    --sidebar-hover: #334155;
    --header-bg: #fff;
    --header-shadow: 0 2px 8px rgba(30,41,59,0.06);
    --card-bg: #fff;
    --card-shadow: 0 2px 8px rgba(30,41,59,0.08);
    --primary: #2563eb;
    --accent: #f59e42;
    --success: #43a047;
    --danger: #e53935;
    --warning: #ffb300;
    --info: #0288d1;
    --gray: #64748b;
    --light: #f4f6fb;
    --border: #e5e7eb;
}

body {
    font-family: 'Inter', 'Segoe UI', Arial, sans-serif;
    background: var(--main-bg);
    color: #222;
    font-size: 1rem;
}

/* Header */
header.navbar {
    background: var(--header-bg);
    color: var(--primary);
    box-shadow: var(--header-shadow);
    border-bottom: 1px solid var(--border);
    min-height: 56px;
}
.navbar-brand {
    color: var(--primary) !important;
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: 1px;
}
.navbar .navbar-toggler {
    border: none;
    color: var(--primary);
}

/* Sidebar */
.sidebar {
    background: var(--sidebar-bg);
    color: #fff;
    min-height: 100vh;
    box-shadow: 2px 0 8px rgba(30,41,59,0.04);
    padding-top: 1rem;
}
.sidebar .nav-link {
    color: #cbd5e1;
    background: none;
    border-radius: 0.5rem;
    margin: 0.25rem 0.5rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: background 0.2s, color 0.2s;
    font-size: 1.05rem;
}
.sidebar .nav-link i {
    font-size: 1.15rem;
    min-width: 22px;
    text-align: center;
}
.sidebar .nav-link.active, .sidebar .nav-link:focus, .sidebar .nav-link:hover {
    background: var(--sidebar-active);
    color: #fff !important;
}
.sidebar-heading {
    color: #94a3b8;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin: 1.5rem 0 0.5rem 1rem;
    font-weight: 600;
}

/* Main Content */
main {
    padding-top: 2rem;
}

/* Cards */
.card {
    background: var(--card-bg);
    border: none;
    border-radius: 1rem;
    box-shadow: var(--card-shadow);
    margin-bottom: 2rem;
}
.card-header {
    background: transparent;
    border-bottom: 1px solid var(--border);
    font-weight: 600;
    color: var(--primary);
    font-size: 1.1rem;
}

/* Buttons */
.btn {
    border-radius: 0.5rem;
    font-weight: 600;
    padding: 0.5rem 1.2rem;
    font-size: 1rem;
    transition: background 0.2s, box-shadow 0.2s;
}
.btn-primary {
    background: var(--primary);
    border-color: var(--primary);
}
.btn-primary:hover {
    background: #1746a2;
    border-color: #1746a2;
}
.btn-accent {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}
.btn-success { background: var(--success); border-color: var(--success); }
.btn-danger { background: var(--danger); border-color: var(--danger); }
.btn-warning { background: var(--warning); border-color: var(--warning); color: #fff; }
.btn-info { background: var(--info); border-color: var(--info); color: #fff; }
.btn-outline-secondary {
    border-color: var(--primary);
    color: var(--primary);
}
.btn-outline-secondary:hover {
    background: var(--primary);
    color: #fff;
}

/* Forms */
.form-control {
    border-radius: 0.5rem;
    border: 1px solid var(--border);
    padding: 0.75rem 1rem;
    font-size: 1rem;
    background: #fff;
    transition: border 0.2s;
}
.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 0.1rem rgba(37,99,235,0.10);
}
.input-group-text {
    border-radius: 0.5rem 0 0 0.5rem;
    background-color: var(--light);
    border: 1px solid var(--border);
}

/* Tables */
.table thead th {
    background-color: var(--light);
    border-bottom: 2px solid var(--border);
    font-weight: 600;
    color: var(--primary);
}
.table tbody tr:hover {
    background-color: #e0e7ef;
}
.table td, .table th {
    vertical-align: middle;
}

/* Badges */
.badge {
    font-size: 0.85rem;
    padding: 0.4em 0.8em;
    border-radius: 0.4em;
    font-weight: 500;
}

/* Alerts */
.alert {
    border: none;
    border-radius: 0.5rem;
    padding: 1rem 1.25rem;
    font-size: 1rem;
}
.alert-success { background: #e8f5e9; color: var(--success); }
.alert-danger { background: #ffebee; color: var(--danger); }
.alert-warning { background: #fff8e1; color: var(--warning); }
.alert-info { background: #e3f2fd; color: var(--info); }

/* Footer */
footer.footer {
    background: #fff;
    color: var(--gray);
    border-top: 1px solid var(--border);
    font-size: 0.95rem;
    padding: 1.2rem 0;
}

/* Responsive */
@media (max-width: 991px) {
    .sidebar {
        min-height: auto;
        position: static;
        width: 100%;
        box-shadow: none;
    }
    main {
        padding-top: 1rem;
    }
}
@media (max-width: 768px) {
    .navbar-brand { font-size: 1rem; }
    .sidebar .nav-link { font-size: 1rem; }
    .card { border-radius: 0.7rem; }
}

/* Custom Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: #f1f1f1; border-radius: 4px; }
::-webkit-scrollbar-thumb { background: #c1c1c1; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #a8a8a8; }

/* Animasyonlar */
.fade-in { animation: fadeIn 0.5s ease-in; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

/* Print Styles */
@media print {
    .sidebar, .navbar, .btn, .no-print { display: none !important; }
    main { margin-left: 0 !important; padding: 0 !important; }
    .card { box-shadow: none !important; border: 1px solid #dee2e6 !important; }
}