/* ─── Theme Variables ─── */
:root {
    --sidebar-w: 240px;
    --topbar-h: 56px;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #dbeafe;
    --bg: #f8fafc;
    --bg-card: #ffffff;
    --bg-card-hover: #f8fafc;
    --text: #0f172a;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --shadow-sm: 0 1px 2px rgba(0,0,0,.04);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,.06), 0 2px 4px -2px rgba(0,0,0,.04);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.08), 0 4px 6px -4px rgba(0,0,0,.04);
    --topbar-bg: rgba(255,255,255,.85);
    --topbar-border: rgba(226,232,240,.8);
    --sidebar-bg: #0f172a;
    --sidebar-text: #94a3b8;
    --sidebar-text-hover: #e2e8f0;
    --sidebar-footer-border: rgba(255,255,255,.06);
    --donut-track: #e2e8f0;
    --pre-bg: #0f172a;
    --pre-text: #e2e8f0;
}

[data-theme="dark"] {
    --bg: #0b1120;
    --bg-card: #1a2332;
    --bg-card-hover: #1e293b;
    --text: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: #1e293b;
    --border-light: #1a2332;
    --shadow-sm: 0 1px 2px rgba(0,0,0,.2);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,.3), 0 2px 4px -2px rgba(0,0,0,.2);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.4), 0 4px 6px -4px rgba(0,0,0,.3);
    --topbar-bg: rgba(11,17,32,.9);
    --topbar-border: rgba(30,41,59,.8);
    --sidebar-bg: #080e1a;
    --sidebar-text: #64748b;
    --sidebar-text-hover: #e2e8f0;
    --sidebar-footer-border: rgba(255,255,255,.06);
    --primary-light: #1e3a5f;
    --donut-track: #1e293b;
    --pre-bg: #080e1a;
    --pre-text: #e2e8f0;
    color-scheme: dark;
}

/* ─── Base ─── */
body {
    background: var(--bg);
    color: var(--text);
    font-size: .875rem;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Inter', sans-serif;
    transition: background .2s, color .2s;
}

/* ─── Topbar ─── */
.topbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--topbar-h);
    background: var(--topbar-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--topbar-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.25rem;
    z-index: 1030;
    transition: background .2s, border-color .2s;
}
.hamburger {
    background: none;
    border: none;
    font-size: 1.4rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px 6px;
    border-radius: 8px;
    line-height: 1;
    margin-right: .75rem;
    transition: background .15s;
}
.hamburger:hover { background: var(--border-light); }
.topbar-brand {
    display: flex;
    align-items: center;
    gap: .6rem;
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--text);
    transition: color .2s;
}
.topbar-right {
    display: flex;
    align-items: center;
    gap: .5rem;
}
.theme-btn {
    background: none;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 5px 8px;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1;
    display: flex;
    align-items: center;
    transition: all .15s;
}
.theme-btn:hover {
    background: var(--bg-card);
    border-color: var(--text-muted);
    color: var(--text);
}
.theme-btn .light-icon { display: inline; }
.theme-btn .dark-icon { display: none; }
[data-theme="dark"] .theme-btn .light-icon { display: none; }
[data-theme="dark"] .theme-btn .dark-icon { display: inline; }
.topbar-clock {
    display: flex;
    align-items: center;
    gap: .75rem;
    color: var(--text-secondary);
    font-size: .8rem;
}
.topbar-clock .time { font-weight: 600; font-size: .9rem; color: var(--text); letter-spacing: .3px; }
.topbar-clock .date { color: var(--text-muted); }
.topbar-clock .tz { background: var(--border); padding: 2px 8px; border-radius: 6px; font-size: .7rem; font-weight: 600; color: var(--text-secondary); letter-spacing: .5px; }

/* ─── Layout ─── */
.app-layout {
    display: flex;
    padding-top: var(--topbar-h);
    min-height: 100vh;
}

/* ─── Sidebar ─── */
.sidebar {
    width: var(--sidebar-w);
    background: var(--sidebar-bg);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: margin-left .25s cubic-bezier(.4,0,.2,1), opacity .2s;
    position: fixed;
    top: var(--topbar-h);
    left: 0;
    bottom: 0;
    z-index: 1020;
    overflow-y: auto;
}
.sidebar.collapsed {
    margin-left: calc(var(--sidebar-w) * -1);
    opacity: 0;
    pointer-events: none;
}
.sidebar-inner {
    padding: 1rem .75rem;
    display: flex;
    flex-direction: column;
    height: 100%;
}
.sidebar .nav-link {
    color: var(--sidebar-text) !important;
    border-radius: 8px;
    padding: .6rem .75rem;
    margin-bottom: 2px;
    font-size: .85rem;
    display: flex;
    align-items: center;
    gap: .6rem;
    transition: all .15s;
}
.sidebar .nav-link i { font-size: 1.1rem; width: 1.25rem; text-align: center; }
.sidebar .nav-link:hover {
    background: rgba(255,255,255,.08);
    color: var(--sidebar-text-hover) !important;
}
.sidebar .nav-link.active {
    background: var(--primary) !important;
    color: #fff !important;
}
.sidebar .nav-label {
    font-size: .65rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #475569;
    padding: .75rem .75rem .25rem;
}
.sidebar-footer {
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--sidebar-footer-border);
    text-align: center;
    font-size: .7rem;
    color: #475569;
}

/* ─── Main Content ─── */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-w);
    transition: margin-left .25s cubic-bezier(.4,0,.2,1);
    padding: 1.5rem;
    min-width: 0;
}
.main-content.expanded {
    margin-left: 0;
}

/* ─── Cards ─── */
.card {
    border: none;
    box-shadow: var(--shadow-sm);
    border-radius: 12px;
    background: var(--bg-card);
    transition: box-shadow .2s, background .2s;
}
.card:hover { box-shadow: var(--shadow-md); }
.card-header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-light);
    border-radius: 12px 12px 0 0 !important;
    padding: .75rem 1rem;
    font-weight: 600;
    font-size: .85rem;
    transition: background .2s, border-color .2s;
}
.card-body { padding: 1rem; }

/* ─── Statistics Cards ─── */
.row.g-3 .card {
    border-radius: 12px;
    transition: transform .15s, box-shadow .2s;
}
.row.g-3 .card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* ─── Tables ─── */
.table {
    --bs-table-bg: transparent;
    color: var(--text);
}
.table th {
    font-weight: 600;
    font-size: .75rem;
    text-transform: uppercase;
    letter-spacing: .5px;
    color: var(--text-muted);
    border-bottom-width: 1px;
    border-color: var(--border-light);
    padding: .6rem .75rem;
}
.table td {
    vertical-align: middle;
    padding: .6rem .75rem;
    border-color: var(--border-light);
    color: var(--text);
}
.table-hover tbody tr:hover { background: var(--bg-card-hover); }

/* ─── Buttons ─── */
.btn-outline-primary { border-color: var(--primary); color: var(--primary); }
.btn-outline-primary:hover { background: var(--primary); border-color: var(--primary); }
.btn-primary { background: var(--primary); border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn-outline-secondary { color: var(--text-secondary); border-color: var(--border); }
.btn-outline-secondary:hover { background: var(--bg-card-hover); border-color: var(--text-muted); color: var(--text); }

/* ─── Form ─── */
.form-control, .form-select {
    background: var(--bg-card);
    border-color: var(--border);
    color: var(--text);
    transition: border-color .15s, background .2s, color .2s;
}
.form-control:focus, .form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,.15);
    background: var(--bg-card);
    color: var(--text);
}
.form-control::placeholder { color: var(--text-muted); }
.form-label { color: var(--text); }
.form-text { color: var(--text-muted); }

/* ─── Modal ─── */
.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
}
.modal-header {
    border-bottom: 1px solid var(--border-light);
    border-radius: 16px 16px 0 0;
    padding: 1rem 1.25rem;
}
.modal-header .modal-title { color: var(--text); font-weight: 700; }
.modal-header .btn-close { filter: var(--btn-close-filter, none); }
[data-theme="dark"] .btn-close { filter: invert(1) brightness(200%); }
.modal-footer {
    border-top: 1px solid var(--border-light);
    border-radius: 0 0 16px 16px;
    padding: .75rem 1.25rem;
}
.modal-body { padding: 1.25rem; }

/* ─── Dropdown / Select in dark ─── */
[data-theme="dark"] select.form-select option {
    background: #1a2332;
    color: #e2e8f0;
}

/* ─── Misc ─── */
.badge { font-weight: 500; }
pre {
    background: var(--pre-bg);
    color: var(--pre-text);
    padding: 1rem;
    border-radius: 10px;
    overflow-x: auto;
    font-size: .8rem;
    max-height: 500px;
}
code {
    background: var(--border-light);
    color: var(--primary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: .8em;
}
.bi { line-height: 1; }
.alert {
    border-radius: 10px;
}
.pagination .page-link {
    background: var(--bg-card);
    border-color: var(--border);
    color: var(--text);
}
.pagination .page-link:hover {
    background: var(--bg-card-hover);
    border-color: var(--text-muted);
}
.pagination .page-item.active .page-link {
    background: var(--primary);
    border-color: var(--primary);
}

/* ─── Donut grid ─── */
.active-tasks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: .75rem;
}
.task-donut-card {
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem;
    background: var(--bg-card);
    transition: box-shadow .2s, border-color .2s, background .2s;
    display: flex;
    align-items: center;
    gap: 1rem;
}
.task-donut-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}
.task-donut-info { flex: 1; min-width: 0; }
.task-donut-info .text-muted { color: var(--text-muted) !important; }
.donut { flex-shrink: 0; width: 72px; height: 72px; }
.donut .track { fill: none; stroke: var(--donut-track); stroke-width: 6; transition: stroke .2s; }
.donut .fill { fill: none; stroke-width: 6; stroke-linecap: round; }
.donut .fill.success { stroke: #22c55e; }
.donut .fill.warning { stroke: #f59e0b; }
.donut .fill.danger { stroke: #ef4444; }
.donut .fill.info { stroke: #06b6d4; }
.donut .fill.secondary { stroke: var(--text-muted); }
.donut-text {
    fill: var(--text);
    font-size: .75rem;
    dominant-baseline: central;
    text-anchor: middle;
    font-weight: 700;
}
.donut-label {
    fill: var(--text-muted);
    font-size: .55rem;
    dominant-baseline: central;
    text-anchor: middle;
}

/* ─── Toast ─── */
.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 9999;
}

/* ─── Select cursor ─── */
.cursor-pointer { cursor: pointer; }

/* ─── Dark mode text overrides ─── */
[data-theme="dark"] .text-muted,
[data-theme="dark"] small.text-muted {
    color: #94a3b8 !important;
}
[data-theme="dark"] .text-dark {
    color: #e2e8f0 !important;
}
[data-theme="dark"] .text-body {
    color: #e2e8f0 !important;
}
[data-theme="dark"] .table {
    color: #e2e8f0;
}
[data-theme="dark"] .table-hover tbody tr:hover {
    color: #e2e8f0;
}
[data-theme="dark"] .bg-warning.text-dark {
    color: #0f172a !important;
}
[data-theme="dark"] .nav-label {
    color: #64748b;
}
[data-theme="dark"] .sidebar-footer {
    color: #64748b;
}
[data-theme="dark"] .card-header {
    color: #e2e8f0;
}
[data-theme="dark"] .topbar-clock .time {
    color: #e2e8f0;
}
[data-theme="dark"] h1, [data-theme="dark"] h2, [data-theme="dark"] h3,
[data-theme="dark"] h4, [data-theme="dark"] h5, [data-theme="dark"] h6 {
    color: #e2e8f0;
}
[data-theme="dark"] .card-title {
    color: #e2e8f0;
}
[data-theme="dark"] .modal-title {
    color: #e2e8f0;
}
[data-theme="dark"] .card-text,
[data-theme="dark"] p,
[data-theme="dark"] li,
[data-theme="dark"] strong,
[data-theme="dark"] ul,
[data-theme="dark"] .form-label {
    color: #e2e8f0;
}
[data-theme="dark"] .badge.bg-info.text-dark {
    color: #0f172a !important;
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
    .sidebar {
        margin-left: calc(var(--sidebar-w) * -1);
        opacity: 0;
        pointer-events: none;
    }
    .sidebar.mobile-open {
        margin-left: 0;
        opacity: 1;
        pointer-events: auto;
        box-shadow: 4px 0 20px rgba(0,0,0,.3);
    }
    .main-content {
        margin-left: 0 !important;
    }
    .topbar-clock .date,
    .topbar-clock .tz { display: none; }
}