/* =========================================================
   Design tokens
   ========================================================= */
:root {
    --bg:        #0b0d12;
    --panel:     #14171d;
    --panel-2:   #1a1e26;
    --border:    rgba(255,255,255,0.07);
    --border-strong: rgba(255,255,255,0.12);
    --text:      #e6eef6;
    --muted:     #8a93a4;
    --muted-2:   #5e6675;
    --accent:    #4f8cff;
    --accent-2:  #6ea0ff;
    --accent-soft: rgba(79,140,255,0.15);
    --success:   #34d399;
    --warning:   #fbbf24;
    --danger:    #f87171;
    --radius:    12px;
    --radius-sm: 8px;
    --shadow:    0 8px 24px rgba(0,0,0,0.45);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.35);
    --space-1:   4px;
    --space-2:   8px;
    --space-3:   12px;
    --space-4:   16px;
    --space-5:   24px;
    --space-6:   32px;
    --font:      'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

/* =========================================================
   Base
   ========================================================= */
html, body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    font-feature-settings: 'cv11', 'ss01';
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body { font-size: 14.5px; line-height: 1.5; }

h1, h2, h3, h4, h5, h6 { color: var(--text); font-weight: 600; letter-spacing: -0.01em; }
h2 { font-size: 1.5rem; margin-bottom: var(--space-4); }
h3 { font-size: 1.125rem; margin-bottom: var(--space-3); }

a { color: var(--accent-2); text-decoration: none; }
a:hover { color: var(--accent); }

.text-muted, .muted { color: var(--muted) !important; }
.tabular { font-variant-numeric: tabular-nums; }

/* =========================================================
   Layout
   ========================================================= */
.app-shell { display: flex; min-height: 100vh; }

/* Sidebar */
.sidebar {
    width: 240px;
    flex-shrink: 0;
    background: var(--panel);
    border-right: 1px solid var(--border);
    padding: var(--space-5) var(--space-4);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}
.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 4px 8px;
    margin-bottom: var(--space-4);
    font-weight: 600;
    font-size: 1rem;
    letter-spacing: -0.01em;
}
.sidebar-brand .logo {
    width: 28px; height: 28px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--accent), #8b5cf6);
    display: grid; place-items: center;
    color: #fff; font-size: 14px;
    box-shadow: 0 4px 12px rgba(79,140,255,0.35);
}
.sidebar-section {
    text-transform: uppercase;
    font-size: 0.7rem;
    letter-spacing: 0.08em;
    color: var(--muted-2);
    padding: var(--space-3) var(--space-2) var(--space-1);
}
.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 10px;
    border-radius: var(--radius-sm);
    color: var(--muted);
    background: transparent;
    border: none;
    font-size: 0.92rem;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
    width: 100%;
}
.nav-item i { font-size: 1.05rem; width: 18px; text-align: center; opacity: 0.85; }
.nav-item:hover { background: rgba(255,255,255,0.04); color: var(--text); }
.nav-item.active { background: var(--accent-soft); color: var(--accent-2); }
.nav-item.active i { opacity: 1; }
.nav-divider { height: 1px; background: var(--border); margin: var(--space-3) 0; }
.nav-item.danger { color: var(--muted); }
.nav-item.danger:hover { background: rgba(248,113,113,0.1); color: var(--danger); }

/* Main */
.main {
    flex: 1;
    min-width: 0;
    padding: var(--space-5) var(--space-6);
    max-width: 100%;
}
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-5);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--border);
}
.page-header h1 {
    font-size: 1.5rem;
    margin: 0;
}
.page-header .meta {
    color: var(--muted);
    font-size: 0.85rem;
}

/* =========================================================
   Card panel
   ========================================================= */
.card-panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--space-5);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--space-4);
}
.card-panel + .card-panel { margin-top: var(--space-4); }
.card-panel h2,
.card-panel h3 { margin-top: 0; }
.card-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-4);
    gap: var(--space-3);
    flex-wrap: wrap;
}
.card-panel-header h2,
.card-panel-header h3 { margin-bottom: 0; }

/* =========================================================
   Stat cards
   ========================================================= */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-4);
    margin-bottom: var(--space-5);
}
.stat-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--space-5);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
    transition: border-color 0.2s ease, transform 0.2s ease;
}
.stat-card:hover { border-color: var(--border-strong); }
.stat-card .label {
    color: var(--muted);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: 500;
    margin-bottom: var(--space-2);
    display: flex;
    align-items: center;
    gap: 6px;
}
.stat-card .label i { font-size: 0.95rem; opacity: 0.7; }
.stat-card .value {
    font-size: 1.85rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    font-variant-numeric: tabular-nums;
    margin-bottom: 2px;
    line-height: 1.1;
}
.stat-card .sub {
    color: var(--muted);
    font-size: 0.82rem;
}
.stat-card .accent { color: var(--accent-2); }
.stat-card .success { color: var(--success); }
.stat-card .warning { color: var(--warning); }

/* =========================================================
   Segmented control
   ========================================================= */
.segmented {
    display: inline-flex;
    background: var(--panel-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 3px;
    gap: 2px;
}
.segmented button {
    background: transparent;
    border: none;
    color: var(--muted);
    padding: 6px 14px;
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s ease;
}
.segmented button:hover { color: var(--text); }
.segmented button.active {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 2px 6px rgba(79,140,255,0.35);
}

/* =========================================================
   Tables
   ========================================================= */
.table-modern {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: transparent;
    font-size: 0.9rem;
}
.table-modern thead th {
    background: transparent;
    color: var(--muted);
    font-weight: 500;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    border-bottom: 1px solid var(--border);
    padding: 10px var(--space-3);
    text-align: left;
}
.table-modern tbody td {
    padding: 12px var(--space-3);
    border-bottom: 1px solid var(--border);
    color: var(--text);
    background: transparent;
    vertical-align: middle;
}
.table-modern tbody tr:last-child td { border-bottom: none; }
.table-modern tbody tr:hover td { background: rgba(255,255,255,0.02); }
.table-modern .num { font-variant-numeric: tabular-nums; text-align: right; }

/* Bootstrap leakage guards */
.table, .table th, .table td { background: transparent !important; color: var(--text); border-color: var(--border) !important; }
.table-striped > tbody > tr:nth-of-type(odd),
.table-striped > tbody > tr:nth-of-type(even) { background: transparent; }

/* =========================================================
   Disk usage bar
   ========================================================= */
.disk-row { display: flex; align-items: center; gap: var(--space-3); }
.disk-bar {
    flex: 1;
    height: 6px;
    background: rgba(255,255,255,0.05);
    border-radius: 999px;
    overflow: hidden;
    min-width: 80px;
    max-width: 220px;
}
.disk-bar > span {
    display: block;
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    border-radius: 999px;
}
.disk-bar.warn > span { background: linear-gradient(90deg, var(--warning), #f59e0b); }
.disk-bar.danger > span { background: linear-gradient(90deg, var(--danger), #ef4444); }
.disk-pct { color: var(--muted); font-size: 0.82rem; min-width: 38px; font-variant-numeric: tabular-nums; }

/* =========================================================
   Folder lists (Space tab)
   ========================================================= */
.folder-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-3);
}
.folder-group h3 {
    color: var(--muted);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: var(--space-2);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.folder-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}
.folder-list li {
    background: var(--panel-2);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 4px 10px;
    font-size: 0.82rem;
    color: var(--text);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.folder-list li i { color: var(--muted); font-size: 0.85rem; }

/* =========================================================
   Forms / inputs
   ========================================================= */
.form-control {
    background: var(--panel-2);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.form-control:focus {
    background: var(--panel-2);
    color: var(--text);
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
    outline: none;
}
.form-control::placeholder { color: var(--muted-2); }

.btn { font-weight: 500; border-radius: var(--radius-sm); padding: 9px 16px; transition: all 0.15s ease; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover, .btn-primary:focus { background: var(--accent-2); border-color: var(--accent-2); color: #fff; box-shadow: 0 4px 12px rgba(79,140,255,0.35); }
.btn-danger { background: var(--danger); border-color: var(--danger); color: #fff; }

/* =========================================================
   Login
   ========================================================= */
.login-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    background:
        radial-gradient(ellipse at top, rgba(79,140,255,0.08), transparent 60%),
        radial-gradient(ellipse at bottom, rgba(139,92,246,0.06), transparent 60%),
        var(--bg);
    padding: var(--space-5);
}
.login-card {
    width: 100%;
    max-width: 360px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--space-6);
    box-shadow: var(--shadow);
}
.login-card .logo {
    width: 44px; height: 44px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--accent), #8b5cf6);
    display: grid; place-items: center;
    color: #fff; font-size: 20px;
    margin-bottom: var(--space-4);
    box-shadow: 0 4px 12px rgba(79,140,255,0.35);
}
.login-card h1 {
    font-size: 1.25rem;
    margin: 0 0 4px;
}
.login-card .sub {
    color: var(--muted);
    font-size: 0.88rem;
    margin-bottom: var(--space-5);
}
.login-card .alert {
    background: rgba(248,113,113,0.08);
    border: 1px solid rgba(248,113,113,0.2);
    color: var(--danger);
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    margin-bottom: var(--space-3);
}

/* =========================================================
   Plotly chart container
   ========================================================= */
.chart-frame {
    width: 100%;
    height: 420px;
    margin-top: var(--space-3);
}
.chart-empty {
    text-align: center;
    color: var(--muted);
    padding: 60px var(--space-4);
    font-size: 0.9rem;
}

/* =========================================================
   Utility
   ========================================================= */
.d-none { display: none !important; }
.spinner {
    width: 16px; height: 16px;
    border: 2px solid rgba(255,255,255,0.15);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    display: inline-block;
    vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }
.is-loading { opacity: 0.5; pointer-events: none; transition: opacity 0.15s ease; }

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 768px) {
    .app-shell { flex-direction: column; }
    .sidebar {
        width: 100%;
        height: auto;
        position: static;
        flex-direction: row;
        flex-wrap: wrap;
        align-items: center;
        padding: var(--space-3);
        gap: var(--space-1);
    }
    .sidebar-brand { width: 100%; margin-bottom: var(--space-2); }
    .sidebar-section { display: none; }
    .nav-item { width: auto; padding: 7px 12px; font-size: 0.85rem; }
    .nav-divider { display: none; }
    .main { padding: var(--space-4); }
    .page-header { flex-direction: column; align-items: flex-start; gap: var(--space-2); }
}