/* Temel Değişkenler ve Reset */
:root {
    --bg-dark: #0a0e27;
    --bg-card: rgba(255, 255, 255, 0.05);
    --border-glass: rgba(255, 255, 255, 0.1);
    --text-main: #ffffff;
    --text-muted: rgba(255, 255, 255, 0.7);
    --accent: #f0b429;
    --accent-hover: #f5c34d;
    --danger: #ff5252;
    --warning: #ffb74d;
    --success: #4caf50;
    --info: #29b6f6;
    
    --sidebar-width: 260px;
    --topbar-height: 70px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body.app-body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-dark);
    color: var(--text-main);
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.2);
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.4);
}

/* Glassmorphism Utils */
.glass-panel {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-glass);
    border-radius: 16px;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: rgba(0, 0, 0, 0.3);
    border-right: 1px solid var(--border-glass);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: transform 0.3s ease;
}

.sidebar-header {
    height: var(--topbar-height);
    display: flex;
    align-items: center;
    padding: 0 24px;
    border-bottom: 1px solid var(--border-glass);
}

.sidebar-header h2 {
    font-size: 20px;
    font-weight: 700;
}
.sidebar-header h2 span {
    color: var(--accent);
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 20px 0;
}

.sidebar-nav ul {
    list-style: none;
}

.nav-item a {
    display: flex;
    align-items: center;
    padding: 12px 24px;
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s ease;
}

.nav-item a i {
    width: 24px;
    font-size: 18px;
    margin-right: 12px;
}

.nav-item:hover a, .nav-item.active a {
    color: var(--text-main);
    background: rgba(240, 180, 41, 0.1);
    border-right: 4px solid var(--accent);
}

.nav-item.active a i {
    color: var(--accent);
}

.badge {
    margin-left: auto;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}
.badge-warning { background: rgba(255, 183, 77, 0.2); color: var(--warning); }
.badge-danger { background: rgba(255, 82, 82, 0.2); color: var(--danger); }
.badge-info { background: rgba(41, 182, 246, 0.2); color: var(--info); }

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid var(--border-glass);
}

.user-info {
    display: flex;
    align-items: center;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 12px;
}

.user-details {
    display: flex;
    flex-direction: column;
}

.user-name {
    font-weight: 600;
    font-size: 14px;
}

.logout-link {
    color: var(--danger);
    text-decoration: none;
    font-size: 12px;
    margin-top: 4px;
    opacity: 0.8;
}
.logout-link:hover { opacity: 1; }

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.topbar {
    height: var(--topbar-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 30px;
    border-bottom: 1px solid var(--border-glass);
    background: rgba(0, 0, 0, 0.1);
}

.banner-title {
    font-size: 22px;
    font-weight: 600;
    letter-spacing: 0.5px;
    background: linear-gradient(90deg, #fff, rgba(255,255,255,0.7));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.btn-icon {
    background: transparent;
    border: none;
    color: var(--text-main);
    font-size: 20px;
    cursor: pointer;
    display: none; /* Mobilde gösterilecek */
}

.content-wrapper {
    flex: 1;
    overflow-y: auto;
    padding: 30px;
}

/* Sayfa Başlıkları */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.page-title {
    font-size: 24px;
    font-weight: 600;
}

/* Dashboard Kartları */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    padding: 24px;
    display: flex;
    align-items: center;
    transition: transform 0.2s ease;
}
.stat-card:hover { transform: translateY(-5px); }

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-right: 20px;
}

.icon-blue { background: rgba(41, 98, 255, 0.1); color: #448aff; }
.icon-orange { background: rgba(255, 152, 0, 0.1); color: #ff9800; }
.icon-red { background: rgba(244, 67, 54, 0.1); color: #f44336; }
.icon-green { background: rgba(76, 175, 80, 0.1); color: #4caf50; }

.stat-info h3 {
    font-size: 14px;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 5px;
}

.stat-info p {
    font-size: 28px;
    font-weight: 700;
}

/* Tablolar */
.table-container {
    overflow-x: auto;
}

.table-controls {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
    gap: 10px;
}

.search-input {
    background: rgba(0,0,0,0.2);
    border: 1px solid var(--border-glass);
    color: #fff;
    padding: 10px 16px;
    border-radius: 8px;
    width: 300px;
}

.btn {
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    color: #fff;
    padding: 10px 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--accent);
    color: var(--bg-dark);
    font-weight: 600;
}
.btn-primary:hover { background: var(--accent-hover); }

.data-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
}

.data-table th, .data-table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-glass);
}

.data-table th {
    font-weight: 600;
    color: var(--text-muted);
    font-size: 14px;
    white-space: nowrap;
}

.data-table tbody tr {
    transition: background 0.2s;
}
.data-table tbody tr:hover {
    background: rgba(255,255,255,0.05);
}

/* Vade Durumları (Satır renkleri) */
.row-yaklasan { border-left: 4px solid var(--warning); }
.row-gecen { border-left: 4px solid var(--danger); }
.row-potansiyel { border-left: 4px solid var(--info); }

.status-badge {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
}
.bg-potansiyel { background: rgba(41, 182, 246, 0.2); color: var(--info); }

/* File Upload */
.upload-zone {
    border: 2px dashed var(--border-glass);
    border-radius: 16px;
    padding: 50px 20px;
    text-align: center;
    background: rgba(0,0,0,0.2);
    cursor: pointer;
    transition: all 0.3s;
}
.upload-zone.dragover {
    border-color: var(--accent);
    background: rgba(240, 180, 41, 0.05);
}
.upload-icon {
    font-size: 48px;
    color: var(--text-muted);
    margin-bottom: 20px;
}
.upload-btn {
    margin-top: 20px;
}

/* Form Settings */
.settings-form .form-group {
    margin-bottom: 20px;
}
.settings-form label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-muted);
}
.settings-form input {
    width: 100%;
    max-width: 400px;
    padding: 12px 16px;
    background: rgba(0,0,0,0.2);
    border: 1px solid var(--border-glass);
    color: #fff;
    border-radius: 8px;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(5px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}
.modal.show { display: flex; }
.modal-content {
    background: var(--bg-dark);
    width: 90%;
    max-width: 800px;
    max-height: 90vh;
    border-radius: 16px;
    border: 1px solid var(--border-glass);
    display: flex;
    flex-direction: column;
}
.modal-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-glass);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.close-modal {
    font-size: 24px;
    cursor: pointer;
    color: var(--text-muted);
}
.close-modal:hover { color: #fff; }
.modal-body {
    padding: 20px;
    overflow-y: auto;
}

/* Loading */
.loader {
    display: inline-block;
    width: 30px;
    height: 30px;
    border: 3px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: var(--accent);
    animation: spin 1s ease-in-out infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-container {
    text-align: center;
    padding: 50px;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        height: 100vh;
        transform: translateX(-100%);
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .btn-icon {
        display: block;
    }
    .stats-grid {
        grid-template-columns: 1fr;
    }
}