/* ==========================================
   🌟 0. DESIGN TOKENS
   ========================================== */
:root {
    --bg-deep: #0A0F1A;
    --bg-line: #111a2c;
    --surface: #121A2B;
    --surface-raised: #182238;
    --border: #253150;
    --border-soft: #1c2a45;

    --accent-solar: #F5A729;
    --accent-solar-soft: rgba(245, 167, 41, 0.15);
    --accent-energy: #2DD4A7;
    --accent-energy-soft: rgba(45, 212, 167, 0.15);
    --accent-alert: #FF5C5C;
    --accent-warn: #FFA53D;
    --accent-purple: #9D7BEA;

    --text-primary: #EAF0FB;
    --text-muted: #8A96B3;
    --text-faint: #5C6885;

    --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
    --font-body: 'Inter', 'Segoe UI', Arial, sans-serif;
    --font-mono: 'JetBrains Mono', 'Consolas', monospace;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
}

/* ==========================================
   🌟 1. GLOBAL STYLES & RESET
   ========================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-deep);
    background-image:
        linear-gradient(var(--bg-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--bg-line) 1px, transparent 1px);
    background-size: 44px 44px;
    padding: 24px;
    color: var(--text-primary);
    min-height: 100vh;
}

h1 {
    font-family: var(--font-display);
    color: var(--text-primary);
    letter-spacing: 0.5px;
}

/* Base Container */
.container,
#dashboard-container {
    max-width: 1400px;
    margin: 0 auto;
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 30px;
    border-radius: var(--radius-lg);
    box-shadow: 0px 20px 60px rgba(0, 0, 0, 0.45);
}

/* ==========================================
   🧭 2. DASHBOARD HEADER
   ========================================== */
.dash-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-soft);
}

.brand {
    display: flex;
    align-items: center;
    gap: 14px;
}

.brand-icon {
    font-size: 30px;
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-solar-soft);
    border: 1px solid var(--accent-solar);
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.brand h1 {
    font-size: 24px;
    line-height: 1.2;
}

.brand-sub {
    color: var(--text-muted);
    font-size: 13px;
    margin-top: 2px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
}

.live-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 1px;
    color: var(--accent-energy);
    background: var(--accent-energy-soft);
    border: 1px solid var(--accent-energy);
    padding: 7px 14px;
    border-radius: 999px;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-energy);
    box-shadow: 0 0 0 0 var(--accent-energy);
    animation: pulse 1.8s infinite;
}

@media (prefers-reduced-motion: reduce) {
    .pulse-dot { animation: none; }
}

@keyframes pulse {
    0%   { box-shadow: 0 0 0 0 rgba(45, 212, 167, 0.55); }
    70%  { box-shadow: 0 0 0 8px rgba(45, 212, 167, 0); }
    100% { box-shadow: 0 0 0 0 rgba(45, 212, 167, 0); }
}

#logoutBtn {
    background: transparent;
    color: var(--accent-alert);
    border: 1px solid var(--accent-alert);
    padding: 10px 18px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 600;
    font-family: var(--font-body);
    transition: background 0.2s, color 0.2s;
}

#logoutBtn:hover {
    background: var(--accent-alert);
    color: #0A0F1A;
}

/* ==========================================
   🔐 3. AUTHENTICATION (LOGIN UI)
   ========================================== */
#login-container {
    max-width: 400px;
    margin: 80px auto;
    padding: 40px;
    text-align: center;
    border-radius: var(--radius-lg);
    background: var(--surface);
    border: 1px solid var(--border);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    border-top: 3px solid var(--accent-solar);
    color: var(--text-primary);
}

.login-badge {
    width: 56px;
    height: 56px;
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    background: var(--accent-solar-soft);
    border: 1px solid var(--accent-solar);
    border-radius: 50%;
}

#login-container h2 {
    margin-bottom: 8px;
    font-family: var(--font-display);
    color: var(--text-primary);
}

.login-subtitle {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 20px;
}

#login-container input {
    width: 100%;
    padding: 14px;
    margin: 10px 0;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 15px;
    background: var(--surface-raised);
    color: var(--text-primary);
    font-family: var(--font-body);
    transition: border-color 0.3s;
}

#login-container input::placeholder {
    color: var(--text-faint);
}

#login-container input:focus {
    border-color: var(--accent-solar);
    outline: none;
}

.login-error {
    color: var(--accent-alert);
    font-size: 14px;
    margin: 5px 0 0 0;
    font-weight: bold;
}

#login-container button {
    width: 100%;
    padding: 14px;
    background: var(--accent-solar);
    color: #0A0F1A;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    margin-top: 15px;
    transition: filter 0.2s;
}

#login-container button:hover {
    filter: brightness(1.1);
}

/* ==========================================
   📊 4. FILTERS & ADMIN CONTROLS
   ========================================== */
.filters {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    gap: 14px;
    margin-bottom: 25px;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.filter-label {
    font-weight: 600;
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.filters input[type="date"] {
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    background: var(--surface-raised);
    color: var(--text-primary);
    font-family: var(--font-mono);
    color-scheme: dark;
}

.filter-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.btn {
    padding: 11px 18px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    font-family: var(--font-body);
    color: #0A0F1A;
    transition: filter 0.2s, transform 0.1s;
    white-space: nowrap;
}

.btn:hover { filter: brightness(1.12); }
.btn:active { transform: translateY(1px); }

.btn-primary { background: var(--accent-energy); }
.btn-live { background: var(--accent-warn); }
.btn-export { background: var(--accent-purple); }
.btn-add { background: #2980b9; color: #ffffff; }

/* Admin Controls */
.admin-controls {
    margin-bottom: 25px;
    background: var(--surface-raised);
    border: 1px dashed var(--border);
    padding: 16px 20px;
    border-radius: var(--radius-md);
}

.admin-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
}

.admin-title {
    color: var(--text-primary);
    font-size: 15px;
    white-space: nowrap;
}

.admin-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    flex: 1;
    justify-content: flex-end;
}

#newPanelType {
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-primary);
    font-size: 14px;
    font-family: var(--font-body);
    min-width: 190px;
    flex: 1 1 190px;
}

/* ==========================================
   🚨 ALARM BANNER (FLOATING TOAST)
   ========================================== */
.alarm-banner {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 9999;
    background-color: var(--accent-alert); /* Fallback */
    color: #1a0505;
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-weight: bold;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    width: max-content;
    max-width: 90vw;
    /* চমৎকার একটি পপ-ডাউন অ্যানিমেশন */
    animation: popDown 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes popDown {
    from { 
        top: -20px; 
        opacity: 0; 
    }
    to { 
        top: 24px; 
        opacity: 1; 
    }
}

/* ==========================================
   📈 5. BUSINESS METRICS (ROI WIDGETS)
   ========================================== */
.widgets-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 18px;
    margin-bottom: 22px;
    align-items: stretch;
}

.widget {
    background: var(--surface-raised);
    padding: 20px;
    border-radius: var(--radius-md);
    text-align: center;
    border: 1px solid var(--border-soft);
    border-top: 3px solid var(--accent-solar);
    transition: transform 0.2s, border-color 0.2s;
}

.widget:hover {
    transform: translateY(-4px);
    border-color: var(--accent-solar);
}

.widgets-container:not(.battery-row) .widget:nth-child(2) { border-top-color: var(--accent-energy); }
.widgets-container:not(.battery-row) .widget:nth-child(3) { border-top-color: #2980b9; }

.widget h3 {
    margin: 0 0 10px 0;
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.widget-value {
    font-family: var(--font-mono);
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
}

/* ==========================================
   🔋 6. VIRTUAL BATTERY
   ========================================== */
.battery-widget {
    flex: 2 1 320px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    text-align: left;
    flex-wrap: wrap;
    border-top-color: var(--accent-energy);
}

.battery-info {
    min-width: 160px;
}

.battery-title {
    color: var(--accent-energy);
    text-transform: none;
    font-size: 14px;
    letter-spacing: 0;
    margin-bottom: 4px;
}

.battery-status {
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 13px;
}

.battery-gauge {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    justify-content: flex-end;
    flex: 1;
}

.battery-outer {
    width: 100%;
    max-width: 200px;
    flex: 1 1 140px;
    height: 40px;
    border: 3px solid var(--border);
    border-radius: 6px;
    position: relative;
    background: var(--surface);
}

.battery-outer::after {
    content: '';
    position: absolute;
    right: -9px;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 18px;
    background: var(--border);
    border-radius: 0 3px 3px 0;
}

.battery-inner {
    height: 100%;
    width: 50%;
    background: linear-gradient(90deg, var(--accent-solar), var(--accent-energy));
    border-radius: 3px;
    transition: width 0.5s ease-in-out, background-color 0.5s ease;
    box-shadow: 0 0 12px rgba(45, 212, 167, 0.45);
}

.battery-full {
    background: var(--accent-solar) !important;
    box-shadow: 0 0 16px rgba(245, 167, 41, 0.55);
}

.battery-percent {
    margin: 0;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 22px;
    white-space: nowrap;
}

.grid-widget {
    flex: 1 1 200px;
    border-top-color: var(--accent-purple);
}

.grid-status-text {
    color: var(--text-muted);
    font-size: 17px;
    font-family: var(--font-mono);
}

/* ==========================================
   📈 7. CHART
   ========================================== */
.chart-card {
    width: 100%;
    height: 350px;
    margin-bottom: 24px;
    background: var(--surface-raised);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius-md);
    padding: 16px;
}

#voltageChart {
    width: 100% !important;
    height: 100% !important;
}

/* ==========================================
   📋 8. DATA TABLE
   ========================================== */
.table-card {
    background: var(--surface-raised);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius-md);
    padding: 16px;
    overflow-x: auto;
}

table.logs-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-body);
}

table.logs-table th,
table.logs-table td {
    border: 1px solid var(--border-soft);
    padding: 14px;
    text-align: center;
    color: var(--text-primary);
}

table.logs-table td {
    font-family: var(--font-mono);
    font-size: 13px;
}

table.logs-table th {
    background-color: var(--surface);
    color: var(--text-muted);
    font-weight: 600;
    font-family: var(--font-body);
    text-transform: uppercase;
    font-size: 12px;
    letter-spacing: 0.5px;
}

/* --- DataTables plugin overrides to match dark theme --- */
.dataTables_wrapper {
    color: var(--text-muted);
    font-family: var(--font-body);
    margin-top: 12px;
}

.dataTables_wrapper .dataTables_filter input,
.dataTables_wrapper .dataTables_length select {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    padding: 6px 10px;
    margin-left: 6px;
}

.dataTables_wrapper .dataTables_filter,
.dataTables_wrapper .dataTables_length,
.dataTables_wrapper .dataTables_info {
    color: var(--text-muted);
    font-size: 13px;
}

.dataTables_wrapper .dataTables_paginate .paginate_button {
    color: var(--text-primary) !important;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    margin-left: 4px;
    padding: 6px 12px;
}

.dataTables_wrapper .dataTables_paginate .paginate_button.current {
    background: var(--accent-solar) !important;
    color: #0A0F1A !important;
    border-color: var(--accent-solar);
}

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

.dataTables_wrapper .dataTables_paginate .paginate_button:hover:not(.disabled) {
    background: var(--surface) !important;
    color: var(--accent-solar) !important;
}

table.dataTable.dtr-inline.collapsed > tbody > tr > td.dtr-control:before {
    background-color: var(--accent-solar);
    color: #0A0F1A;
    box-shadow: none;
    top: 50%;
    transform: translateY(-50%);
}

table.dataTable > tbody > tr.child {
    background: var(--surface);
    color: var(--text-primary);
}

table.dataTable > tbody > tr.child ul.dtr-details {
    color: var(--text-primary);
}

table.dataTable > tbody > tr.child span.dtr-title {
    color: var(--text-muted);
}

/* ==========================================
   📱 9. RESPONSIVE DESIGN (MOBILE & TABLET)
   ========================================== */
@media (max-width: 768px) {
    body {
        padding: 12px;
    }

    .container,
    #dashboard-container {
        padding: 16px;
    }

    #login-container {
        width: 100%;
        margin: 40px auto;
        padding: 25px;
    }

    .dash-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .header-actions {
        width: 100%;
        justify-content: space-between;
    }

    .filters {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-group,
    .filter-actions {
        width: 100%;
    }

    .filters input[type="date"] {
        width: 100%;
    }

    .btn {
        width: 100%;
    }

    .admin-row {
        flex-direction: column;
        align-items: stretch;
    }

    .admin-actions {
        justify-content: stretch;
    }

    #newPanelType {
        min-width: 0;
    }

    .battery-widget {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }

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

    .battery-gauge {
        justify-content: center;
    }

    .chart-card {
        height: 280px;
        padding: 10px;
    }
}

@media (max-width: 480px) {
    .brand-icon {
        width: 42px;
        height: 42px;
        font-size: 22px;
    }

    .brand h1 {
        font-size: 19px;
    }

    .widgets-container {
        grid-template-columns: 1fr;
    }

    .widget-value {
        font-size: 20px;
    }
}