@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
    /* Color Palette: Cyber / Slate */
    --bg-deep: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.4);
    --border: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(56, 189, 248, 0.3);

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-accent: #38bdf8; /* Sky 400 */

    --accent: #38bdf8;
    --accent-glow: rgba(56, 189, 248, 0.2);
    --success: #4ade80;
    --warning: #fbbf24;
    --danger: #f87171;

    --gradient-bg: radial-gradient(at 0% 0%, hsla(253,16%,7%,1) 0, transparent 50%),
                   radial-gradient(at 50% 0%, hsla(225,39%,30%,1) 0, transparent 50%),
                   radial-gradient(at 100% 0%, hsla(339,49%,30%,1) 0, transparent 50%);

    --shadow-card: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

    --radius: 12px;
}

body {
    background: var(--bg-deep);
    background-image: var(--gradient-bg);
    background-attachment: fixed;
    color: var(--text-primary);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* Layout & Typography */
.layout { display: flex; min-height: 100vh; }
h1, h2, h3, h4, h5, h6 { margin: 0; font-weight: 700; letter-spacing: -0.025em; color: var(--text-primary); }
p { color: var(--text-secondary); line-height: 1.6; }

/* Components: Card */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-card);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.card:hover {
    box-shadow: var(--shadow-hover);
    border-color: var(--border-hover);
}

/* Components: Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.btn-primary {
    margin-top: 1em;
    background: var(--accent);
    color: var(--bg-deep);
    box-shadow: 0 4px 12px var(--accent-glow);
}
.btn-primary:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px var(--accent-glow);
}
.btn-primary:active { transform: translateY(0); }
.btn-primary:disabled {
    background: var(--text-secondary);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-icon {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 0.4rem 0.8rem;
    border-radius: 8px;
    font-size: 0.85rem;
    transition: all 0.2s;
}
.btn-icon:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border-color: var(--accent);
}

/* Components: Inputs */
.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    box-sizing: border-box;
}
.form-control:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}
.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: rgba(15, 23, 42, 0.75);
    border-right: 1px solid var(--border);
    backdrop-filter: blur(20px);
    display: flex;
    flex-direction: column;
    padding: 2rem 1.5rem;
    position: fixed;
    height: 100%;
    z-index: 50;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 2.5rem;
    color: var(--text-primary);
    background: linear-gradient(90deg, var(--accent), #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.03em;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.85rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 10px;
    margin-bottom: 0.5rem;
    transition: all 0.2s;
    font-weight: 500;
}
.nav-link svg { width: 20px; height: 20px; stroke-width: 2; opacity: 0.8; transition: opacity 0.2s; }
.nav-link:hover {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
}
.nav-link.active {
    background: rgba(56, 189, 248, 0.1);
    color: var(--accent);
    border: 1px solid rgba(56, 189, 248, 0.2);
}
.nav-link.active svg { opacity: 1; stroke: var(--accent); }

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 330px;
    padding: 2rem;
    width: 100%;
    max-width: 1920px;
}

/* Top Bar */
.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding: 1rem 1.5rem;
    background: rgba(30, 41, 59, 0.6);
    border: 1px solid var(--border);
    border-radius: 16px;
    backdrop-filter: blur(16px);
    position: sticky;
    top: 1rem;
    z-index: 40;
    flex-wrap: wrap;
    gap: 1rem;
}

.dataset-selector {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 0.6rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    cursor: pointer;
    min-width: 240px;
    transition: border-color 0.2s;
}
.dataset-selector:focus { border-color: var(--accent); outline: none; }

.select-wrapper {
    position: relative;
    min-width: 200px;
}
.multi-select-item {
    padding: 8px 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid var(--grid);
    transition: background 0.2s;
    color: var(--text);
    font-size: 0.9rem;
}
.multi-select-item:hover {
    background: rgba(255, 255, 255, 0.05);
}
.multi-select-item:last-child {
    border-bottom: none;
}
.multi-select-item .hidden-input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.multi-select-item .custom-checkmark {
    position: relative;
    display: inline-block;
    width: 18px;
    height: 18px;
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: 4px;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.multi-select-item:hover .custom-checkmark {
    background-color: rgba(255, 255, 255, 0.1);
}

.multi-select-item input:checked ~ .custom-checkmark {
    background-color: var(--accent);
    border-color: var(--accent);
}

.multi-select-item .custom-checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.multi-select-item input:checked ~ .custom-checkmark:after {
    display: block;
}

/* Checkmark style for checkboxes */
.multi-select-item input[type="checkbox"] ~ .custom-checkmark:after {
    left: 6px;
    top: 2px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* Radio button specific styling */
.multi-select-item input[type="radio"] ~ .custom-checkmark {
    border-radius: 50%;
}
.multi-select-item input[type="radio"] ~ .custom-checkmark:after {
    top: 4px;
    left: 4px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: white;
}

.filters-bar { display: flex; gap: 0.75rem; flex-wrap: wrap; align-items: center; }
.filter-btn {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.filter-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    border-color: var(--text-secondary);
}
.filter-btn.active {
    background: rgba(56, 189, 248, 0.15);
    color: var(--accent);
    border-color: var(--accent);
}

/* KPI Grid */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}
.kpi-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
    min-height: 140px;
}
.kpi-card::after {
    content: '';
    position: absolute;
    top: 0; right: 0; width: 80px; height: 80px;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    opacity: 0.6;
    pointer-events: none;
}
.kpi-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}
.kpi-value {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.1;
    letter-spacing: -0.02em;
}
.kpi-trend {
    font-size: 0.9rem;
    font-weight: 600;
    margin-top: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}
.trend-up { color: var(--success); }
.trend-down { color: var(--danger); }
.trend-neutral { color: var(--text-secondary); }

/* Charts */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}
.full-width { grid-column: span 2; }
.chart-card { min-height: 420px; display: flex; flex-direction: column; }
.chart-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.5rem; }
.chart-title { font-size: 1.1rem; font-weight: 700; color: var(--text-primary); }
.chart-container { flex: 1; position: relative; width: 100%; min-height: 300px; }

/* Tables */
.table-card { overflow: hidden; }
table.dataTable {
    width: 100% !important;
    border-collapse: separate !important;
    border-spacing: 0;
    margin-top: 0 !important;
}
table.dataTable thead th {
    background: rgba(15, 23, 42, 0.8);
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    padding: 1rem !important;
    border-bottom: 1px solid var(--border) !important;
}
table.dataTable tbody td {
    padding: 1rem !important;
    border-bottom: 1px solid var(--border) !important;
    color: var(--text-primary);
    font-size: 0.9rem;
}
table.dataTable tbody tr:hover td { background: rgba(255, 255, 255, 0.03); }

/* File Upload Zone */
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    transition: all 0.2s;
    background: rgba(255,255,255,0.02);
    cursor: pointer;
    position: relative;
}
.upload-zone:hover, .upload-zone.dragover {
    border-color: var(--accent);
    background: rgba(56, 189, 248, 0.05);
}
.upload-icon {
    width: 48px; height: 48px;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    stroke-width: 1.5;
}
.upload-text { font-size: 1rem; font-weight: 600; color: var(--text-primary); margin-bottom: 0.5rem; }
.upload-sub { font-size: 0.85rem; color: var(--text-secondary); }
.file-input {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    opacity: 0;
    cursor: pointer;
}

/* Progress Bar */
.progress-container {
    margin-top: 1.5rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 999px;
    overflow: hidden;
    height: 10px;
    position: relative;
}
.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    width: 0%;
    border-radius: 999px;
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 0 12px var(--accent-glow);
}
.progress-status {
    display: flex; justify-content: space-between; margin-bottom: 0.5rem;
    font-size: 0.9rem; font-weight: 500; color: var(--text-secondary);
}

/* Mobile */
.mobile-menu-btn { display: none; background: transparent; border: none; color: var(--text-primary); font-size: 1.5rem; cursor: pointer; padding: 0.5rem; }

@media (max-width: 1024px) {
    .sidebar { transform: translateX(-100%); width: 100%; }
    .sidebar.open { transform: translateX(0); }
    .main-content { margin-left: 0; padding: 1rem; }
    .mobile-menu-btn { display: block; }
    .charts-grid { grid-template-columns: 1fr; }
    .full-width { grid-column: span 1; }
    .top-bar { flex-direction: column; align-items: stretch; gap: 1rem; }
}


/* ==========================================
   Custom Chart Data Tables (Toggle View)
   ========================================== */
.custom-chart-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    color: var(--text);
    font-size: 0.85rem;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--grid);
    background: rgba(30, 41, 59, 0.3); /* Ελαφρύ dark background */
}

.custom-chart-table th, 
.custom-chart-table td {
    padding: 12px 16px;
    text-align: right; /* Οι αριθμοί στοιχίζονται δεξιά για εύκολη σύγκριση */
    border-bottom: 1px solid var(--grid);
}

.custom-chart-table th {
    background-color: rgba(15, 23, 42, 0.6); /* Πιο σκούρο στο header */
    font-weight: 600;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.75rem;
    white-space: nowrap;
}

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

.custom-chart-table tbody tr {
    transition: background-color 0.2s ease;
}

/* Διακριτικό Hover Effect στη γραμμή */
.custom-chart-table tbody tr:hover {
    background-color: rgba(255, 255, 255, 0.05); 
}

/* Custom Scrollbar για τον πίνακα αν έχει πολλές στήλες */
.chart-data-table::-webkit-scrollbar {
    height: 6px;
}
.chart-data-table::-webkit-scrollbar-track {
    background: rgba(0,0,0,0.1);
    border-radius: 4px;
}
.chart-data-table::-webkit-scrollbar-thumb {
    background: var(--muted);
    border-radius: 4px;
}

/* Διόρθωση του Multi-Select Dropdown */
#multiSelectMenu {
    /* Βάζουμε συμπαγές χρώμα φόντου για να μην φεγγίζουν τα από κάτω (άλλαξε το χρώμα αν θες άλλο σκούρο) */
    background-color: #1e293b !important; 
    /* Βάζουμε τεράστιο z-index για να είναι πάντα πάνω από οτιδήποτε άλλο (π.χ. modals, τίτλους) */
    z-index: 9999 !important; 
    border: 1px solid var(--border-color, #334155) !important;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5) !important;
    padding: 0.5rem 0;
}

/* Ομορφαίνουμε τις επιλογές (checkboxes & κείμενο) μέσα στο dropdown */
#multiSelectMenu label {
    display: flex !important;
    align-items: center;
    padding: 0.6rem 1rem;
    cursor: pointer;
    color: var(--text-primary, #ffffff);
    transition: background-color 0.2s ease;
    gap: 0.5rem;
    margin: 0;
    font-size: 0.95rem;
}

/* Hover εφέ όταν περνάει το ποντίκι από μια επιλογή */
#multiSelectMenu label:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* Λίγο μεγαλύτερα checkboxes για ευκολία στο κλικ */
#multiSelectMenu input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    margin: 0;
}