/* Modern CSS Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #4f46e5;
    --secondary: #64748b;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    --sidebar-bg: #1e293b;
    --sidebar-hover: #334155;
    --sidebar-active: #4f46e5;
    --bg-light: #f0f2f5;
    --bg-white: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

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

.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 220px;
    background-color: var(--sidebar-bg);
    color: #e2e8f0;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    left: 0;
    top: 0;
    z-index: 1000;
}

.sidebar-header {
    padding: 25px 20px;
    text-align: center;
    border-bottom: 1px solid #4a5568;
}

.logo-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
}

.logo-text {
    font-size: 32px;
    font-weight: bold;
    color: #ffffff;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 8px;
}

.logo-name {
    color: #ffffff;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.sidebar-nav {
    flex: 1;
    padding: 10px 0;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 15px 20px;
    color: #e2e8f0;
    text-decoration: none;
    transition: background-color 0.2s;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background-color: var(--sidebar-hover);
}

.nav-item.active {
    background-color: var(--sidebar-active);
    border-left-color: #ffffff;
    font-weight: bold;
}

/* Renkli menü öğeleri */
.nav-personel.active {
    background-color: #3b82f6;
    border-left-color: #ffffff;
}

.nav-odemeler.active {
    background-color: #10b981;
    border-left-color: #ffffff;
}

.nav-bordro.active {
    background-color: #6366f1;
    border-left-color: #ffffff;
}

.nav-parametreler.active {
    background-color: #f59e0b;
    border-left-color: #ffffff;
}

.nav-ayarlar.active {
    background-color: #64748b;
    border-left-color: #ffffff;
}

.nav-hakkinda.active {
    background-color: #8b5cf6;
    border-left-color: #ffffff;
}

.sidebar-footer {
    padding: 20px;
    text-align: center;
    border-top: 1px solid #4a5568;
    margin-top: auto;
}

.version-text {
    color: #94a3b8;
    font-size: 12px;
    font-weight: 500;
}

.nav-item i {
    margin-right: 12px;
    width: 20px;
    text-align: center;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 220px;
    padding: 20px;
    min-height: 100vh;
}

/* Flash Messages */
.flash-messages {
    margin-bottom: 20px;
}

.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.alert-success {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #10b981;
}

.alert-error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #ef4444;
}

.alert-close {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: inherit;
    opacity: 0.7;
}

.alert-close:hover {
    opacity: 1;
}

/* Cards */
.card {
    background: var(--bg-white);
    border-radius: 8px;
    padding: 20px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
    text-align: center;
}

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

.btn-primary:hover {
    background-color: #4338ca;
}

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

.btn-success:hover {
    background-color: #059669;
}

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

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

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

.btn-secondary:hover {
    background-color: #475569;
}

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

.btn-info:hover {
    background-color: #2563eb;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    transition: border-color 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

/* Tables */
.table-container {
    overflow-x: auto;
    background: var(--bg-white);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

table {
    width: 100%;
    border-collapse: collapse;
}

table thead {
    background-color: #f9fafb;
}

table th {
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
}

table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
}

table tbody tr:hover {
    background-color: #f9fafb;
}

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

/* Badge */
.badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success {
    background-color: #d1fae5;
    color: #065f46;
}

.badge-danger {
    background-color: #fee2e2;
    color: #991b1b;
}

/* Utilities */
.text-right {
    text-align: right;
}

.text-center {
    text-align: center;
}

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }

.d-flex {
    display: flex;
}

.justify-between {
    justify-content: space-between;
}

.align-center {
    align-items: center;
}

.gap-2 {
    gap: 16px;
}

/* Number formatting */
.number {
    font-family: 'Courier New', monospace;
    text-align: right;
}