:root {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-card: #0f3460;
    --bg-input: #1e2a4a;
    --accent: #00d09c;
    --accent-hover: #00f5b8;
    --accent-dim: rgba(0, 208, 156, 0.15);
    --text-primary: #ffffff;
    --text-secondary: #a0aec0;
    --text-muted: #718096;
    --border: #2a2a4a;
    --danger: #ff4757;
    --warning: #ffa502;
    --success: #2ed573;
    --info: #45aaf2;
    --sidebar-width: 260px;
}

* { box-sizing: border-box; }

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    margin: 0;
    min-height: 100vh;
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

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

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    min-height: 100vh;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1040;
    transition: transform 0.3s ease;
    overflow-y: auto;
}

.sidebar-header {
    padding: 1.25rem 1rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-brand {
    color: var(--accent) !important;
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
}
.sidebar-brand:hover { color: var(--accent-hover) !important; }

#sidebarToggleClose { color: var(--text-secondary); display: none; }

.sidebar-nav {
    list-style: none;
    padding: 0.5rem 0;
    margin: 0;
}

.nav-section {
    padding: 1rem 1.25rem 0.4rem;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--text-muted);
}

.nav-item .nav-link {
    display: flex;
    align-items: center;
    padding: 0.6rem 1.25rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

.nav-item .nav-link i {
    width: 20px;
    text-align: center;
    margin-right: 0.75rem;
    font-size: 0.9rem;
}

.nav-item .nav-link:hover {
    color: var(--text-primary);
    background: var(--accent-dim);
    border-left-color: var(--accent);
}

.nav-item .nav-link.active {
    color: var(--accent);
    background: var(--accent-dim);
    border-left-color: var(--accent);
    font-weight: 600;
}

/* Page Content */
#page-content-wrapper {
    margin-left: var(--sidebar-width);
    width: calc(100% - var(--sidebar-width));
    min-height: 100vh;
    transition: margin-left 0.3s ease;
}

/* Topbar */
.topbar {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem 1rem;
    position: sticky;
    top: 0;
    z-index: 1030;
}

.sidebar-toggle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    padding: 0.25rem 0.5rem;
}
.sidebar-toggle:hover { color: var(--accent); }

.page-title {
    color: var(--text-primary) !important;
    font-weight: 600;
    font-size: 1rem;
    margin-left: 0.5rem;
}

.user-dropdown {
    color: var(--text-secondary) !important;
    font-size: 0.875rem;
    text-decoration: none;
}
.user-dropdown:hover { color: var(--accent) !important; }

.main-content {
    padding: 1.5rem;
}

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    color: var(--text-primary);
}

.card-header {
    background: transparent;
    border-bottom: 1px solid var(--border);
    padding: 1rem 1.25rem;
    font-weight: 600;
}

.card-body { padding: 1.25rem; }

.stat-card {
    border: none;
    border-radius: 0.75rem;
    padding: 1.5rem;
    position: relative;
    overflow: hidden;
    transition: transform 0.2s;
}
.stat-card:hover { transform: translateY(-2px); }

.stat-card .stat-icon {
    font-size: 2rem;
    opacity: 0.3;
    position: absolute;
    right: 1rem;
    top: 1rem;
}

.stat-card .stat-value {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1;
}

.stat-card .stat-label {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 0.5rem;
    opacity: 0.8;
}

.stat-card.bg-accent { background: linear-gradient(135deg, #0f3460, #00d09c30); border: 1px solid var(--accent); }
.stat-card.bg-warning-card { background: linear-gradient(135deg, #0f3460, #ffa50230); border: 1px solid var(--warning); }
.stat-card.bg-success-card { background: linear-gradient(135deg, #0f3460, #2ed57330); border: 1px solid var(--success); }
.stat-card.bg-danger-card { background: linear-gradient(135deg, #0f3460, #ff475730); border: 1px solid var(--danger); }

/* Tables */
.table { color: var(--text-primary); }
.table thead th {
    background: var(--bg-secondary);
    border-bottom: 2px solid var(--accent);
    color: var(--accent);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
    padding: 0.75rem;
}
.table tbody td {
    border-bottom: 1px solid var(--border);
    padding: 0.65rem 0.75rem;
    vertical-align: middle;
    font-size: 0.875rem;
}
.table tbody tr:hover { background: var(--accent-dim); }
.table-striped tbody tr:nth-of-type(odd) { background-color: rgba(255,255,255,0.02); }

/* DataTables overrides */
.dataTables_wrapper .dataTables_length select,
.dataTables_wrapper .dataTables_filter input {
    background: var(--bg-input) !important;
    border: 1px solid var(--border) !important;
    color: var(--text-primary) !important;
    border-radius: 0.375rem;
    padding: 0.35rem 0.75rem;
}

.dataTables_wrapper .dataTables_info,
.dataTables_wrapper .dataTables_length label,
.dataTables_wrapper .dataTables_filter label {
    color: var(--text-secondary) !important;
    font-size: 0.85rem;
}

.dataTables_wrapper .dataTables_paginate .paginate_button {
    color: var(--text-secondary) !important;
    border: 1px solid var(--border) !important;
    background: var(--bg-input) !important;
    border-radius: 0.375rem !important;
    margin: 0 2px;
}
.dataTables_wrapper .dataTables_paginate .paginate_button:hover {
    background: var(--accent-dim) !important;
    color: var(--accent) !important;
    border-color: var(--accent) !important;
}
.dataTables_wrapper .dataTables_paginate .paginate_button.current {
    background: var(--accent) !important;
    color: var(--bg-primary) !important;
    border-color: var(--accent) !important;
    font-weight: 600;
}
.dataTables_wrapper .dataTables_paginate .paginate_button.disabled {
    opacity: 0.4;
}

/* Forms */
.form-control, .form-select {
    background-color: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: 0.5rem;
}
.form-control:focus, .form-select:focus {
    background-color: var(--bg-input);
    border-color: var(--accent);
    color: var(--text-primary);
    box-shadow: 0 0 0 0.2rem var(--accent-dim);
}
.form-control::placeholder { color: var(--text-muted); }
.form-label { color: var(--text-secondary); font-size: 0.85rem; font-weight: 500; }

/* Koyu tema kontrast düzeltmesi: Bootstrap 5.3'ün açık tema varsayılanı
   (--bs-secondary-color) koyu kart zemininde okunmuyor. */
.text-muted,
.text-body-secondary,
.form-text {
    color: var(--text-secondary) !important;
}

.input-group-text {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    color: var(--text-secondary);
}

/* Buttons */
.btn-accent {
    background: var(--accent);
    color: var(--bg-primary);
    border: none;
    font-weight: 600;
    border-radius: 0.5rem;
    transition: all 0.2s;
}
.btn-accent:hover {
    background: var(--accent-hover);
    color: var(--bg-primary);
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(0, 208, 156, 0.3);
}

.btn-outline-accent {
    border: 1px solid var(--accent);
    color: var(--accent);
    background: transparent;
    border-radius: 0.5rem;
}
.btn-outline-accent:hover {
    background: var(--accent);
    color: var(--bg-primary);
}

.btn-dark-custom {
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: 0.5rem;
}
.btn-dark-custom:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-color: var(--accent);
}

/* Badges */
.badge-bekliyor { background: var(--warning); color: #000; }
.badge-inceleniyor { background: var(--info); color: #fff; }
.badge-tamamlandi { background: var(--success); color: #fff; }
.badge-basarisiz { background: var(--danger); color: #fff; }
.badge-iptal { background: var(--text-muted); color: #fff; }

/* Modals */
.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-primary);
}
.modal-header { border-bottom: 1px solid var(--border); }
.modal-footer { border-top: 1px solid var(--border); }
.btn-close { filter: invert(1); }

/* Dropdown */
.dropdown-menu-dark {
    background: var(--bg-card) !important;
    border: 1px solid var(--border);
}
.dropdown-menu-dark .dropdown-item { color: var(--text-secondary); }
.dropdown-menu-dark .dropdown-item:hover { background: var(--accent-dim); color: var(--accent); }

/* Login Page */
.login-body {
    background: linear-gradient(135deg, #0f0c29 0%, #1a1a2e 50%, #0f3460 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.login-wrapper {
    width: 100%;
    max-width: 440px;
    padding: 1rem;
}

.login-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 1rem;
    padding: 2.5rem;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.login-logo {
    text-align: center;
    margin-bottom: 2rem;
}

.login-logo i {
    font-size: 3rem;
    color: var(--accent);
    margin-bottom: 0.75rem;
}

.login-logo h4 {
    color: var(--text-primary);
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.login-logo p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.login-card .form-control {
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
}

.login-card .btn-accent {
    padding: 0.75rem;
    font-size: 1rem;
    width: 100%;
    margin-top: 0.5rem;
}

/* Alert */
.alert-danger-custom {
    background: rgba(255, 71, 87, 0.15);
    border: 1px solid var(--danger);
    color: var(--danger);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
}

/* Overlay */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1035;
}

/* Responsive */
@media (max-width: 767.98px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.show { transform: translateX(0); }
    .sidebar.show ~ .sidebar-overlay { display: block; }
    #sidebarToggleClose { display: block; }
    #page-content-wrapper { margin-left: 0; width: 100%; }
}

/* Chart container */
.chart-container {
    position: relative;
    height: 300px;
}

/* Access Denied */
.access-denied {
    text-align: center;
    padding: 4rem 2rem;
}
.access-denied i { font-size: 4rem; color: var(--danger); margin-bottom: 1rem; }
.access-denied h2 { color: var(--text-primary); margin-bottom: 1rem; }
.access-denied p { color: var(--text-secondary); }

/* Pagination custom */
.page-link {
    background: var(--bg-input);
    border-color: var(--border);
    color: var(--text-secondary);
}
.page-link:hover {
    background: var(--accent-dim);
    border-color: var(--accent);
    color: var(--accent);
}
.page-item.active .page-link {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--bg-primary);
}

/* Toast notifications */
.toast-container { position: fixed; top: 1rem; right: 1rem; z-index: 9999; }

/* Selection highlight */
::selection { background: var(--accent); color: var(--bg-primary); }

/* Calc result table */
.calc-result-table {
    font-size: 0.85rem;
}
.calc-result-table th {
    background: var(--bg-secondary) !important;
    font-weight: 600;
}
.calc-result-table .highlight-row {
    background: var(--accent-dim) !important;
}
.calc-result-table .total-row {
    background: var(--bg-secondary) !important;
    font-weight: 700;
    border-top: 2px solid var(--accent);
}