:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --primary-light: #eef2ff;
    
    --success: #10b981;
    --success-light: #ecfdf5;
    --success-hover: #059669;
    
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    
    --danger: #ef4444;
    --danger-light: #fef2f2;
    --danger-hover: #dc2626;
    
    --info: #06b6d4;
    --info-light: #ecfeff;
    
    --bg-body: #f8fafc;
    --bg-card: #ffffff;
    --bg-sidebar: #ffffff;
    
    --text-main: #1e293b;
    --text-muted: #64748b;
    --text-white: #ffffff;
    
    --border: #e2e8f0;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05), 0 1px 2px rgba(0,0,0,0.02);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.05), 0 4px 6px -2px rgba(0,0,0,0.02);
    --shadow-premium: 0 20px 25px -5px rgba(0,0,0,0.03), 0 10px 10px -5px rgba(0,0,0,0.01);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Outfit', sans-serif;
}

body {
    background-color: var(--bg-body);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
}

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

/* Layout Structure */
.app-container {
    display: flex;
    width: 100%;
    min-height: 100vh;
}

/* Sidebar Styling */
.sidebar {
    width: 260px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 24px;
    position: fixed;
    height: 100vh;
    z-index: 100;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 32px;
}

.logo-container img {
    width: 44px;
    height: 44px;
    object-fit: cover;
    border-radius: var(--radius-sm);
}

.logo-container h2 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1.2;
}

.logo-container span {
    font-size: 11px;
    font-weight: 400;
    color: var(--text-muted);
    display: block;
}

.sidebar-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sidebar-menu li a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    color: var(--text-muted);
    font-weight: 500;
    font-size: 14px;
    transition: all 0.2s ease;
}

.sidebar-menu li a:hover,
.sidebar-menu li.active a {
    background-color: var(--primary-light);
    color: var(--primary);
}

.sidebar-menu li a svg {
    width: 20px;
    height: 20px;
    transition: transform 0.2s ease;
}

.sidebar-menu li a:hover svg {
    transform: translateX(2px);
}

.sidebar-footer {
    margin-top: auto;
    border-top: 1px solid var(--border);
    padding-top: 16px;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.user-avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background-color: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
}

.user-info h4 {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-main);
}

.user-info p {
    font-size: 11px;
    color: var(--text-muted);
}

/* Main Content Area */
.main-content {
    margin-left: 260px;
    width: calc(100% - 260px);
    max-width: calc(100% - 260px);
    flex: 1;
    min-width: 0; /* Yatay taşmayı global olarak engeller */
    padding: 32px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Navbar */
.top-navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--bg-card);
    padding: 16px 24px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.page-title h1 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-main);
}

.page-title p {
    font-size: 13px;
    color: var(--text-muted);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.date-badge {
    background-color: var(--bg-body);
    border: 1px solid var(--border);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Cards & Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.stat-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-details h3 {
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.stat-details .value {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-main);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-icon.primary { background-color: var(--primary-light); color: var(--primary); }
.stat-icon.success { background-color: var(--success-light); color: var(--success); }
.stat-icon.warning { background-color: var(--warning-light); color: var(--warning); }
.stat-icon.danger { background-color: var(--danger-light); color: var(--danger); }

/* Table Container */
.data-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.card-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.card-header h2 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-main);
}

.card-header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

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

.btn-secondary {
    background-color: #f1f5f9;
    border-color: var(--border);
    color: var(--text-main);
}

.btn-secondary:hover {
    background-color: #e2e8f0;
}

.btn-outline {
    background-color: transparent;
    border-color: var(--border);
    color: var(--text-muted);
}

.btn-outline:hover {
    background-color: #f1f5f9;
    color: var(--text-main);
}

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

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

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

/* Forms */
.filters-row {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.filter-input {
    padding: 8px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: var(--text-main);
    outline: none;
    background-color: var(--bg-body);
    transition: all 0.2s ease;
}

.filter-input:focus {
    border-color: var(--primary);
    background-color: #fff;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* Tables */
.table-responsive {
    width: 100%;
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.table th {
    background-color: #f8fafc;
    padding: 14px 24px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}

.table td {
    padding: 16px 24px;
    font-size: 14px;
    color: var(--text-main);
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

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

.table tr:hover td {
    background-color: #fafbfd;
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 9999px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-success { background-color: var(--success-light); color: var(--success); }
.badge-warning { background-color: var(--warning-light); color: var(--warning); }
.badge-danger { background-color: var(--danger-light); color: var(--danger); }
.badge-info { background-color: var(--info-light); color: var(--info); }

/* Document link */
.doc-link {
    color: var(--primary);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.doc-link:hover {
    text-decoration: underline;
}

/* Modals */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(15, 23, 42, 0.3);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.modal-backdrop.show {
    opacity: 1;
    pointer-events: auto;
}

.modal {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-premium);
    border: 1px solid var(--border);
    transform: translateY(20px);
    transition: transform 0.25s ease;
}

.modal-backdrop.show .modal {
    transform: translateY(0);
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 18px;
    font-weight: 700;
}

.close-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4px;
    border-radius: 50%;
    transition: background-color 0.2s ease;
}

.close-btn:hover {
    background-color: #f1f5f9;
    color: var(--text-main);
}

.modal-body {
    padding: 24px;
}

.form-grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group.full-width {
    grid-column: span 2;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-main);
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    font-size: 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    outline: none;
    background-color: #fcfdfe;
    transition: all 0.2s ease;
}

.form-control:focus {
    border-color: var(--primary);
    background-color: #fff;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

textarea.form-control {
    resize: vertical;
    min-height: 80px;
}

/* File Upload Area */
.upload-area {
    border: 2px dashed var(--border);
    padding: 24px;
    border-radius: var(--radius-md);
    text-align: center;
    background-color: var(--bg-body);
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: 8px;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary);
    background-color: var(--primary-light);
}

.upload-icon {
    font-size: 32px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.upload-area p {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.upload-area span {
    font-size: 11px;
    color: var(--text-muted);
}

/* Installment Plan Creator Table */
.installment-creator-container {
    margin-top: 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.installment-creator-table {
    width: 100%;
    border-collapse: collapse;
}

.installment-creator-table th {
    background-color: #f8fafc;
    padding: 8px 12px;
    font-size: 11px;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}

.installment-creator-table td {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
}

.installment-creator-table tr:last-child td {
    border-bottom: none;
}

/* Action Icons */
.action-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    color: var(--text-muted);
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

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

.action-btn.edit:hover { color: var(--primary); background-color: var(--primary-light); }
.action-btn.delete:hover { color: var(--danger); background-color: var(--danger-light); }
.action-btn.success:hover { color: var(--success); background-color: var(--success-light); }

/* Switch / Checkbox Toggle for Paid Status */
.status-toggle {
    cursor: pointer;
    transition: transform 0.1s ease;
}

.status-toggle:active {
    transform: scale(0.95);
}

/* Summary Cards (Dashboard specific) */
.summary-cards {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 24px;
}

@media (max-width: 1024px) {
    .summary-cards {
        grid-template-columns: 1fr;
    }
}

.critical-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.critical-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    border-radius: var(--radius-md);
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.critical-item-details h4 {
    font-size: 14px;
    font-weight: 600;
}

.critical-item-details p {
    font-size: 12px;
    color: var(--text-muted);
}

/* Login Page Stylings */
.login-body {
    background: linear-gradient(135deg, #f8fafc 0%, #eef2ff 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.login-card {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.4);
    box-shadow: var(--shadow-premium);
    width: 100%;
    max-width: 440px;
    padding: 40px;
    border-radius: var(--radius-lg);
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header img {
    max-width: 100px;
    border-radius: 12px;
    margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
}

.login-header h2 {
    font-size: 22px;
    font-weight: 700;
}

.login-header p {
    font-size: 13px;
    color: var(--text-muted);
}

/* Hamburger and mobile buttons defaults */
.hamburger-btn {
    display: none;
}

.sidebar-close-btn {
    display: none;
}

.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(2px);
    z-index: 99;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.sidebar-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

/* Mobile Responsive Design */
@media (max-width: 1024px) {
    /* Hide sidebar by default on mobile */
    .sidebar {
        transform: translateX(-100%);
        box-shadow: 0 0 25px rgba(0,0,0,0.15);
        height: 100vh;
        position: fixed;
        top: 0;
        left: 0;
        transition: transform 0.3s ease;
        z-index: 100;
    }
    
    /* Class to open sidebar */
    .sidebar.open {
        transform: translateX(0);
    }
    
    .sidebar-close-btn {
        display: block !important;
        background: none;
        border: none;
        font-size: 24px;
        cursor: pointer;
        color: var(--text-muted);
        padding: 4px 8px;
    }
    
    /* Make main content span 100% */
    .main-content {
        margin-left: 0;
        width: 100%;
        max-width: 100%;
        padding: 16px;
    }
    
    /* Show hamburger icon inside navbar on mobile */
    .top-navbar {
        padding: 12px 16px;
        gap: 12px;
    }
    
    .hamburger-btn {
        display: inline-flex !important;
        align-items: center;
        justify-content: center;
        width: 40px;
        height: 40px;
        border-radius: var(--radius-sm);
        border: 1px solid var(--border);
        background-color: var(--bg-card);
        color: var(--text-main);
        cursor: pointer;
        font-size: 18px;
        transition: background-color 0.2s;
    }
    
    .hamburger-btn:hover {
        background-color: var(--primary-light);
        color: var(--primary);
    }
    
    .nav-actions {
        gap: 8px;
    }
    
    .date-badge {
        display: none !important; /* Hide date badge on mobile to save space */
    }
    
    /* Stack form grids vertically on mobile */
    .form-grid-2, .form-grid {
        grid-template-columns: 1fr !important;
        gap: 12px;
    }
    
    /* Make summary card layout stack vertically */
    .summary-cards {
        grid-template-columns: 1fr !important;
    }
    
    /* Page layout flex-wrap details */
    .app-container {
        flex-direction: column;
    }
}