:root {
    /* Premium Modern Dark Aesthetic Theme */
    --primary: #6366f1; /* Neon Purple-Indigo */
    --primary-light: #a5b4fc;
    --primary-dark: #4f46e5;
    --secondary: #06b6d4; /* Electric Cyan */
    --secondary-dark: #0891b2;
    --bg-main: #0b0f19; /* Deep Space/Dark Slate */
    --bg-sidebar: #111827; /* Rich Dark Grey */
    --bg-card: #1f2937; /* Glassmorphic Base Grey */
    --border: #374151; /* Dark Border Accent */
    --text-main: #f3f4f6; /* Bright Text */
    --text-muted: #9ca3af; /* Soft Muted Slate */
    --text-light: #6b7280;
    --text-on-dark: #f9fafb;
    
    --success: #10b981;
    --success-light: rgba(16, 185, 129, 0.15);
    --success-dark: #34d399;
    
    --danger: #f43f5e;
    --danger-light: rgba(244, 63, 94, 0.15);
    --danger-dark: #fb7185;
    
    --warning: #f59e0b;
    --warning-light: rgba(245, 158, 11, 0.15);
    --warning-dark: #fbbf24;
    
    --info: #3b82f6;
    --info-light: rgba(59, 130, 246, 0.15);
    --info-dark: #60a5fa;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.5);
    
    --sidebar-width: 280px;
    --header-height: 60px;
    --transition-speed: 0.3s;
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    min-height: 100vh;
    overflow-x: hidden;
}

/* App Layout Layout Grid */
.app-layout {
    display: flex;
    min-height: 100vh;
    width: 100vw;
}

/* Sidebar Styling */
.app-sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-sidebar);
    color: var(--text-on-dark);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 100;
    transition: transform var(--transition-speed) cubic-bezier(0.4, 0, 0.2, 1);
    border-right: 1px solid var(--border);
}

.sidebar-brand {
    padding: 1.5rem;
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 8px;
}

.sidebar-brand a {
    color: #ffffff;
    text-decoration: none;
    background: linear-gradient(135deg, #ffffff 0%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.sidebar-user {
    padding: 1.25rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    border-bottom: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.02);
}

.user-avatar {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
    border: 2px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.3);
}

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

.user-name {
    font-size: 0.925rem;
    font-weight: 600;
    color: #ffffff;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-role {
    font-size: 0.725rem;
    align-self: flex-start;
    margin-top: 2px;
    padding: 2px 8px;
    font-weight: 700;
}

.sidebar-menu {
    padding: 1.25rem 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    flex: 1;
    overflow-y: auto;
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding: 0.85rem 1rem;
    border-radius: 8px;
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.25s ease;
}

.menu-item:hover {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.05);
}

.menu-item.active {
    color: #ffffff;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.menu-icon {
    font-size: 1.15rem;
}

.logout-item {
    margin-top: auto;
    border-top: 1px solid var(--border);
    padding-top: 1.25rem;
}

.logout-item:hover {
    background: var(--danger-light);
    color: #ffffff;
}

.login-item {
    margin-top: auto;
}

/* Main Content Workspace Layout */
.app-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-width: 0;
    transition: margin-left var(--transition-speed) ease;
}

.mobile-header {
    display: none;
    height: var(--header-height);
    background: var(--bg-sidebar);
    border-bottom: 1px solid var(--border);
    padding: 0 1.25rem;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 90;
    box-shadow: var(--shadow-sm);
}

.menu-toggle {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-main);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
    border-radius: 6px;
    transition: background-color 0.2s;
}

.menu-toggle:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.mobile-brand {
    font-weight: 700;
    font-size: 1.15rem;
    color: #ffffff;
    background: linear-gradient(135deg, #ffffff 0%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.main-content {
    flex: 1;
    padding: 2rem;
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    box-sizing: border-box;
}

.footer {
    background-color: var(--bg-sidebar);
    border-top: 1px solid var(--border);
    padding: 1.5rem 2rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Cards & Dashboard Layout system */
.card {
    background: var(--bg-card);
    border-radius: 16px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    padding: 2rem;
    margin-bottom: 1.75rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(99, 102, 241, 0.4);
}

/* Global button styling */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white !important;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 10px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none !important;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 10px rgba(99, 102, 241, 0.2);
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 15px rgba(99, 102, 241, 0.4);
}

.btn:active {
    transform: translateY(0);
}

.btn-success {
    background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
    box-shadow: 0 4px 10px rgba(16, 185, 129, 0.2);
}

.btn-success:hover {
    box-shadow: 0 6px 15px rgba(16, 185, 129, 0.4);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger) 0%, #dc2626 100%);
    box-shadow: 0 4px 10px rgba(244, 63, 94, 0.2);
}

.btn-danger:hover {
    box-shadow: 0 6px 15px rgba(244, 63, 94, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-main) !important;
    border: 1px solid var(--border);
    box-shadow: none;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Form inputs styling */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 0.95rem;
    font-family: inherit;
    background-color: rgba(255, 255, 255, 0.03);
    color: var(--text-main);
    box-sizing: border-box;
    transition: all 0.2s ease;
}

.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background-color: rgba(255, 255, 255, 0.05);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
}

/* Custom table responsive wrapper */
.table-responsive {
    width: 100%;
    overflow-x: auto;
    margin: 1rem 0;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--bg-card);
}

/* Data Tables */
table.data-table, table.dataTable {
    width: 100% !important;
    border-collapse: collapse !important;
    margin: 0 !important;
    background: transparent !important;
}

table.data-table th, table.data-table td,
table.dataTable th, table.dataTable td {
    padding: 1.15rem 1.25rem !important;
    border-bottom: 1px solid var(--border) !important;
    text-align: left;
    font-size: 0.925rem;
    color: var(--text-main);
}

table.data-table th, table.dataTable th {
    background: rgba(255, 255, 255, 0.02) !important;
    font-weight: 600 !important;
    color: var(--text-muted) !important;
    border-bottom: 2px solid var(--border) !important;
}

table.dataTable tbody tr {
    transition: background-color 0.15s ease;
    background-color: transparent !important;
}

table.dataTable tbody tr:hover {
    background-color: rgba(255, 255, 255, 0.02) !important;
}

/* Badges system */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.85rem;
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 600;
    line-height: 1;
}

.badge-success {
    background: var(--success-light);
    color: var(--success-dark);
}

.badge-pending {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-muted);
}

.badge-info {
    background: var(--info-light);
    color: var(--info-dark);
}

.badge-danger {
    background: var(--danger-light);
    color: var(--danger-dark);
}

.badge-warning {
    background: var(--warning-light);
    color: var(--warning-dark);
}

/* Alerts System */
.alert {
    padding: 1rem 1.25rem;
    border-radius: 12px;
    margin-bottom: 1.75rem;
    font-weight: 500;
    font-size: 0.95rem;
    border: 1px solid transparent;
}

.alert-success {
    background: var(--success-light);
    color: var(--success-dark);
    border-color: var(--success);
}

.alert-danger {
    background: var(--danger-light);
    color: var(--danger-dark);
    border-color: var(--danger);
}

/* DataTables pagination details layout */
.dataTables_wrapper .dataTables_info,
.dataTables_wrapper .dataTables_paginate {
    color: var(--text-muted) !important;
    margin-top: 1rem;
}

.dataTables_wrapper .dataTables_paginate .paginate_button {
    color: var(--text-muted) !important;
}

.dataTables_wrapper .dataTables_paginate .paginate_button:hover {
    background: rgba(255, 255, 255, 0.05) !important;
    color: white !important;
}

/* Modal Styling */
#detailsModal > div {
    background: var(--bg-card) !important;
    border: 1px solid var(--border) !important;
    color: var(--text-main) !important;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7) !important;
}

#detailsModal input, #detailsModal select, #detailsModal textarea {
    background-color: rgba(255, 255, 255, 0.03) !important;
    color: var(--text-main) !important;
    border: 1px solid var(--border) !important;
}

#detailsModal input:focus, #detailsModal select:focus, #detailsModal textarea:focus {
    border-color: var(--primary) !important;
}

#detailsModal button {
    color: var(--text-muted) !important;
}
#detailsModal button:hover {
    color: var(--text-main) !important;
}

/* Responsive Breakpoints */
@media (max-width: 992px) {
    .app-sidebar {
        transform: translateX(-100%);
    }
    
    .app-sidebar.active {
        transform: translateX(0);
        box-shadow: 10px 0 30px rgba(0, 0, 0, 0.5);
    }
    
    .app-main {
        margin-left: 0;
    }
    
    .mobile-header {
        display: flex;
    }
    
    .main-content {
        padding: 1.5rem 1rem;
    }
}

/* Global Uniform Field Colors & Contrast Fix */
input[type="text"], 
input[type="email"], 
input[type="tel"], 
input[type="number"], 
input[type="password"], 
input[type="search"], 
select, 
textarea {
    background-color: var(--bg-sidebar) !important; /* solid rich dark grey */
    color: var(--text-main) !important;
    border: 1px solid var(--border) !important;
    border-radius: 8px !important;
    padding: 0.65rem 0.85rem !important;
    font-size: 0.95rem !important;
    font-family: inherit !important;
    box-sizing: border-box !important;
}

select option {
    background-color: var(--bg-sidebar) !important;
    color: var(--text-main) !important;
}

input:focus, select:focus, textarea:focus {
    border-color: var(--primary) !important;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.35) !important;
    outline: none !important;
}

/* Mobile Responsive Adjustments (< 768px) */
@media (max-width: 768px) {
    /* Stack grid-template-columns inline styles and layouts */
    div[style*="display: grid"],
    div[style*="grid-template-columns"],
    .grid-2col {
        grid-template-columns: 1fr !important;
        gap: 1rem !important;
    }

    /* Prevent body horizontal scroll */
    html, body {
        overflow-x: hidden !important;
        width: 100% !important;
    }
    
    .app-layout {
        width: 100% !important;
        overflow-x: hidden !important;
    }

    /* Cards adjustments on mobile */
    .card {
        padding: 1.25rem 1rem !important;
        margin-bottom: 1.25rem !important;
    }

    /* Fix table wrappers to prevent leaks */
    .table-responsive {
        border: none !important;
        background: transparent !important;
        overflow-x: visible !important;
        margin: 0 !important;
    }

    /* Convert tables into native card list rows */
    table.data-table, table.dataTable {
        border: none !important;
        width: 100% !important;
        display: block !important;
    }
    
    table.data-table thead, table.dataTable thead {
        display: none !important;
    }
    
    table.data-table tbody, table.dataTable tbody {
        display: block !important;
        width: 100% !important;
    }
    
    table.data-table tbody tr, table.dataTable tbody tr {
        display: block !important;
        background: var(--bg-card) !important;
        border: 1px solid var(--border) !important;
        border-radius: 12px !important;
        margin-bottom: 1rem !important;
        padding: 1rem !important;
        box-shadow: var(--shadow-sm) !important;
        width: 100% !important;
        box-sizing: border-box !important;
    }
    
    table.data-table tbody tr td, table.dataTable tbody tr td {
        display: flex !important;
        justify-content: space-between !important;
        align-items: center !important;
        width: 100% !important;
        text-align: right !important;
        padding: 0.6rem 0 !important;
        border-bottom: 1px dashed rgba(255, 255, 255, 0.08) !important;
        box-sizing: border-box !important;
        font-size: 0.9rem !important;
        white-space: normal !important;
    }
    
    table.data-table tbody tr td:last-child, table.dataTable tbody tr td:last-child {
        border-bottom: none !important;
    }

    /* Inject labels using pseudo-elements */
    table.data-table tbody tr td::before, table.dataTable tbody tr td::before {
        font-weight: 600;
        color: var(--text-muted);
        text-align: left;
        margin-right: 0.5rem;
    }

    /* 1. Presentations Table (#presentationsTable) */
    #presentationsTable td:nth-of-type(1)::before { content: "Κωδικός:"; }
    #presentationsTable td:nth-of-type(2)::before { content: "Επώνυμο:"; }
    #presentationsTable td:nth-of-type(3)::before { content: "Online:"; }
    #presentationsTable td:nth-of-type(4)::before { content: "Τύπος:"; }
    #presentationsTable td:nth-of-type(5)::before { content: "Γλώσσα:"; }
    #presentationsTable td:nth-of-type(6)::before { content: "Πληρωμή:"; }
    #presentationsTable td:nth-of-type(7)::before { content: "Check-in:"; }
    #presentationsTable td:nth-of-type(8)::before { content: "Βεβαίωση:"; }

    /* 2. Logs Table (#logsTable) */
    #logsTable td:nth-of-type(1)::before { content: "Ημερομηνία:"; }
    #logsTable td:nth-of-type(2)::before { content: "Χρήστης:"; }
    #logsTable td:nth-of-type(3)::before { content: "Ενέργεια:"; }
    #logsTable td:nth-of-type(4)::before { content: "Σχετική Εργασία:"; }

    /* 3. Users Table (#usersTable) */
    #usersTable td:nth-of-type(1)::before { content: "Username:"; }
    #usersTable td:nth-of-type(2)::before { content: "Όνομα:"; }
    #usersTable td:nth-of-type(3)::before { content: "Ρόλος:"; }
    #usersTable td:nth-of-type(4)::before { content: "Ενέργειες:"; }

    /* 4. Fields Table (#fieldsTable) */
    #fieldsTable td:nth-of-type(1)::before { content: "Όνομα (Label):"; }
    #fieldsTable td:nth-of-type(2)::before { content: "Κωδικός (Key):"; }
    #fieldsTable td:nth-of-type(3)::before { content: "Ενέργειες:"; }

    /* Add/Edit Modals Responsive Refinements */
    #detailsModal, #addModal {
        padding: 0 !important;
        align-items: flex-start !important;
    }

    #detailsModal > div, #addModal > div {
        width: 100% !important;
        max-width: 100% !important;
        min-height: 100vh !important;
        height: auto !important;
        border-radius: 0 !important;
        margin: 0 !important;
        padding: 1.5rem 1rem 3rem 1rem !important;
        box-shadow: none !important;
        box-sizing: border-box !important;
    }

    /* Fix flex wraps inside modals */
    #detailsModal div[style*="display: flex"],
    #addModal div[style*="display: flex"] {
        flex-wrap: wrap !important;
        gap: 8px !important;
    }

    /* Make sure specific fields within Details modal are neat on mobile */
    #detailsModal select, #detailsModal input, #detailsModal textarea {
        width: 100% !important;
        box-sizing: border-box !important;
    }
}