/* ============================================================
   ImpurityX — Admin Design System
   File: public/assets/css/app.css
   ------------------------------------------------------------
   ONE source of truth for colours, spacing, typography, and
   component styles. Every admin page should link this file
   instead of redefining its own CSS.
============================================================ */

/* ── Reset & box model ── */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

/* ============================================================
   1. DESIGN TOKENS
============================================================ */
:root {
    /* — Sidebar (dark) — */
    --sb-bg:        #1a2233;
    --sb-bg-hover:  #232d42;
    --sb-bg-active: #2a3650;
    --sb-text:      #cbd5e1;
    --sb-text-mute: #94a3b8;
    --sb-text-hd:   #ffffff;
    --sb-accent:    #f68c1e;
    --sb-border:    #2a3548;
    --sb-section:   #6b7a99;

    /* — Page (light) — */
    --bg:        #f4f6fa;
    --bg-card:   #ffffff;
    --bg-row:    #f8fafc;
    --bg-tint:   #eff3fb;

    /* — Ink — */
    --ink:        #0f172a;
    --ink-mid:    #334155;
    --ink-light:  #64748b;
    --ink-faint:  #94a3b8;

    /* — Borders — */
    --border:    #e2e8f0;
    --border-lt: #f1f5f9;
    --border-md: #cbd5e1;

    /* — Brand & semantic — */
    --primary:        #0c1947;
    --primary-soft:   #eef2ff;
    --primary-mid:    #c7d2fe;
    --accent:         #f68c1e;
    --accent-soft:    #fff4e6;

    --success:      #059669;
    --success-soft: #ecfdf5;
    --success-mid:  #a7f3d0;

    --danger:       #dc2626;
    --danger-soft:  #fef2f2;
    --danger-mid:   #fecaca;

    --warning:      #d97706;
    --warning-soft: #fffbeb;
    --warning-mid:  #fde68a;

    --info:         #2563eb;
    --info-soft:    #eff6ff;
    --info-mid:     #bfdbfe;

    /* — Layout — */
    --sb-width:     232px;
    --sb-collapsed: 64px;
    --header-h:     56px;
    --radius:       8px;
    --radius-lg:    12px;
    --radius-pill:  999px;

    /* — Shadows — */
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, .05);
    --shadow:    0 1px 3px rgba(15, 23, 42, .07), 0 4px 12px rgba(15, 23, 42, .04);
    --shadow-md: 0 4px 12px rgba(15, 23, 42, .08), 0 8px 24px rgba(15, 23, 42, .06);
    --shadow-lg: 0 10px 30px rgba(15, 23, 42, .12);

    /* — Type — */
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --mono: 'JetBrains Mono', 'Consolas', 'Menlo', monospace;
}

/* ============================================================
   2. BASE
============================================================ */
body {
    font-family: var(--font);
    font-size: 13px;
    color: var(--ink);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    line-height: 1.5;
}

a { color: var(--info); text-decoration: none; }
a:hover { text-decoration: underline; }

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: #94a3b8; }

/* ============================================================
   3. SIDEBAR
============================================================ */
.app-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--sb-width);
    background: var(--sb-bg);
    color: var(--sb-text);
    display: flex;
    flex-direction: column;
    z-index: 100;
    border-right: 1px solid var(--sb-border);
    transition: transform .25s ease;
}

/* Brand block */
.sb-brand {
    flex-shrink: 0;
    padding: 16px 18px 14px;
    border-bottom: 1px solid var(--sb-border);
    display: flex;
    align-items: center;
    gap: 11px;
}
.sb-brand-logo {
    width: 34px; height: 34px;
    background: var(--accent);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 800;
    font-size: 16px;
    letter-spacing: -.3px;
    flex-shrink: 0;
}
.sb-brand-name {
    font-size: 15px;
    font-weight: 700;
    color: var(--sb-text-hd);
    letter-spacing: -.2px;
    line-height: 1.1;
}
.sb-brand-sub {
    font-size: 10px;
    color: var(--sb-text-mute);
    text-transform: uppercase;
    letter-spacing: .8px;
    margin-top: 2px;
}

/* Nav */
.sb-nav {
    flex: 1;
    overflow-y: auto;
    padding: 12px 8px 24px;
}
.sb-nav::-webkit-scrollbar { width: 4px; }
.sb-nav::-webkit-scrollbar-thumb { background: #2e3a52; }

.sb-section {
    margin-top: 14px;
    margin-bottom: 4px;
    padding: 0 14px;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .9px;
    color: var(--sb-section);
}
.sb-section:first-child { margin-top: 4px; }

.sb-link {
    display: flex;
    align-items: center;
    gap: 11px;
    padding: 8px 14px;
    margin: 1px 4px;
    color: var(--sb-text);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    border-radius: 6px;
    white-space: nowrap;
    transition: background .12s, color .12s;
    position: relative;
}
.sb-link:hover {
    background: var(--sb-bg-hover);
    color: var(--sb-text-hd);
    text-decoration: none;
}
.sb-link.active {
    background: var(--sb-bg-active);
    color: #fff;
}
.sb-link.active::before {
    content: '';
    position: absolute;
    left: -4px;
    top: 6px;
    bottom: 6px;
    width: 3px;
    background: var(--accent);
    border-radius: 0 2px 2px 0;
}
.sb-link svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    opacity: .85;
}
.sb-link.active svg { opacity: 1; color: var(--accent); }

.sb-badge {
    margin-left: auto;
    font-size: 10px;
    font-weight: 700;
    padding: 2px 7px;
    border-radius: var(--radius-pill);
    background: var(--accent);
    color: #fff;
    letter-spacing: .3px;
}
.sb-badge.muted { background: #475569; color: #cbd5e1; }

/* User block at bottom */
.sb-user {
    flex-shrink: 0;
    padding: 12px 14px;
    border-top: 1px solid var(--sb-border);
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(0,0,0,.18);
}
.sb-user-avatar {
    width: 32px; height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), #d97706);
    color: #fff;
    font-weight: 700;
    font-size: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.sb-user-name {
    font-size: 12.5px;
    font-weight: 600;
    color: var(--sb-text-hd);
    line-height: 1.2;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.sb-user-role {
    font-size: 10px;
    color: var(--sb-text-mute);
    text-transform: uppercase;
    letter-spacing: .5px;
    margin-top: 1px;
}
.sb-user-info { flex: 1; min-width: 0; }
.sb-logout {
    color: var(--sb-text-mute);
    padding: 6px;
    border-radius: 6px;
    display: inline-flex;
    transition: background .12s, color .12s;
    flex-shrink: 0;
}
.sb-logout:hover {
    background: rgba(220, 38, 38, .18);
    color: #fca5a5;
    text-decoration: none;
}
.sb-logout svg { width: 16px; height: 16px; }

/* Mobile toggle button (hidden on desktop) */
.sb-toggle {
    display: none;
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 200;
    width: 38px; height: 38px;
    background: var(--sb-bg);
    color: #fff;
    border: 1px solid var(--sb-border);
    border-radius: 8px;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow);
}
.sb-toggle svg { width: 18px; height: 18px; }

.sb-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, .55);
    z-index: 99;
    backdrop-filter: blur(2px);
}

/* ============================================================
   4. APP SHELL  (page content area)
============================================================ */
.app-shell {
    margin-left: var(--sb-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.app-topbar {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    height: var(--header-h);
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 50;
}
.app-topbar-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--ink);
    display: flex;
    align-items: center;
    gap: 10px;
}
.app-topbar-meta {
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 12px;
    color: var(--ink-light);
}

.app-content {
    flex: 1;
    padding: 24px 28px 40px;
    max-width: 1480px;
    width: 100%;
}

/* Breadcrumb */
.crumbs {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--ink-light);
    margin-bottom: 14px;
}
.crumbs a { color: var(--ink-light); }
.crumbs a:hover { color: var(--info); text-decoration: none; }
.crumbs-sep { color: var(--ink-faint); }
.crumbs-current { color: var(--ink); font-weight: 500; }

.page-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 14px;
    margin-bottom: 20px;
}
.page-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--ink);
    margin: 0;
    letter-spacing: -.4px;
}
.page-subtitle {
    font-size: 13px;
    color: var(--ink-light);
    margin: 4px 0 0;
}

/* ============================================================
   5. CARDS
============================================================ */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    margin-bottom: 18px;
}
.card-header {
    padding: 14px 18px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
}
.card-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--ink);
    margin: 0;
    letter-spacing: -.1px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.card-title svg { width: 16px; height: 16px; color: var(--ink-light); }
.card-body { padding: 16px 18px; }
.card-body.tight { padding: 12px 14px; }
.card-body.flush { padding: 0; }

/* ============================================================
   6. KPI / STAT GRID
============================================================ */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(195px, 1fr));
    gap: 14px;
    margin-bottom: 22px;
}
.kpi {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    padding: 16px 18px;
    box-shadow: var(--shadow-sm);
    transition: transform .15s, box-shadow .15s;
    position: relative;
    overflow: hidden;
}
.kpi:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.kpi::before {
    content: '';
    position: absolute;
    left: 0; top: 0; bottom: 0;
    width: 3px;
    background: var(--info);
}
.kpi.k-success::before { background: var(--success); }
.kpi.k-warn::before    { background: var(--warning); }
.kpi.k-danger::before  { background: var(--danger);  }
.kpi.k-accent::before  { background: var(--accent);  }
.kpi.k-violet::before  { background: #7c3aed; }

.kpi-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}
.kpi-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--ink-light);
    text-transform: uppercase;
    letter-spacing: .6px;
}
.kpi-icon {
    width: 30px; height: 30px;
    border-radius: 8px;
    background: var(--info-soft);
    color: var(--info);
    display: flex;
    align-items: center;
    justify-content: center;
}
.kpi-icon svg { width: 16px; height: 16px; }
.kpi.k-success .kpi-icon { background: var(--success-soft); color: var(--success); }
.kpi.k-warn .kpi-icon    { background: var(--warning-soft); color: var(--warning); }
.kpi.k-danger .kpi-icon  { background: var(--danger-soft);  color: var(--danger);  }
.kpi.k-accent .kpi-icon  { background: var(--accent-soft);  color: var(--accent);  }
.kpi.k-violet .kpi-icon  { background: #f5f3ff;             color: #7c3aed;        }

.kpi-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--ink);
    line-height: 1.1;
    letter-spacing: -.5px;
    font-variant-numeric: tabular-nums;
}
.kpi-foot {
    margin-top: 6px;
    font-size: 11.5px;
    color: var(--ink-light);
}

/* Two-column dashboard layout */
.dash-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr;
    gap: 18px;
}
@media (max-width: 1024px) {
    .dash-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   7. TABLES
============================================================ */
.tbl {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
.tbl thead th {
    background: var(--bg-row);
    color: var(--ink-light);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .5px;
    text-align: left;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}
.tbl tbody td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-lt);
    color: var(--ink-mid);
    vertical-align: middle;
}
.tbl tbody tr:last-child td { border-bottom: none; }
.tbl tbody tr:hover td { background: var(--bg-row); }
.tbl .num { text-align: right; font-variant-numeric: tabular-nums; font-family: var(--mono); font-size: 12.5px; }
.tbl .ctr { text-align: center; }

/* ============================================================
   8. BADGES & STATUS PILLS
============================================================ */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 9px;
    font-size: 10.5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .4px;
    border-radius: var(--radius-pill);
    background: var(--bg-row);
    color: var(--ink-light);
    border: 1px solid var(--border);
    white-space: nowrap;
}
.badge.success { background: var(--success-soft); color: var(--success); border-color: var(--success-mid); }
.badge.warn    { background: var(--warning-soft); color: var(--warning); border-color: var(--warning-mid); }
.badge.danger  { background: var(--danger-soft);  color: var(--danger);  border-color: var(--danger-mid);  }
.badge.info    { background: var(--info-soft);    color: var(--info);    border-color: var(--info-mid);    }
.badge.accent  { background: var(--accent-soft);  color: var(--accent);  border-color: #fed7aa;            }
.badge.dark    { background: var(--primary);      color: #fff;           border-color: var(--primary);     }

/* ============================================================
   9. BUTTONS
============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    height: 36px;
    padding: 0 14px;
    font-family: var(--font);
    font-size: 13px;
    font-weight: 600;
    border-radius: var(--radius);
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    white-space: nowrap;
    transition: background .15s, border-color .15s, color .15s, transform .1s;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn svg { width: 14px; height: 14px; }

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: #1a2566; }

.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: #d97706; }

.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: #047857; }

.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #b91c1c; }

.btn-ghost {
    background: var(--bg-card);
    color: var(--ink-mid);
    border-color: var(--border-md);
}
.btn-ghost:hover { background: var(--bg-row); color: var(--ink); border-color: var(--ink-faint); }

.btn-sm { height: 30px; padding: 0 11px; font-size: 12px; }
.btn-sm svg { width: 12px; height: 12px; }
.btn-lg { height: 42px; padding: 0 18px; font-size: 14px; }

/* ============================================================
   10. FORMS
============================================================ */
.form-group { margin-bottom: 14px; }
.form-label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: var(--ink-mid);
    margin-bottom: 5px;
}
.form-hint { font-size: 11px; color: var(--ink-light); margin-top: 4px; }

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    height: 38px;
    padding: 0 12px;
    font-family: var(--font);
    font-size: 13px;
    color: var(--ink);
    background: var(--bg-card);
    border: 1px solid var(--border-md);
    border-radius: var(--radius);
    transition: border-color .12s, box-shadow .12s;
}
.form-textarea { height: auto; padding: 9px 12px; resize: vertical; min-height: 80px; }

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--info);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .12);
}

/* Toggle switch */
.switch {
    position: relative;
    display: inline-flex;
    align-items: center;
    cursor: pointer;
}
.switch input { display: none; }
.switch-track {
    width: 38px;
    height: 22px;
    background: #cbd5e1;
    border-radius: 999px;
    position: relative;
    transition: background .15s;
    flex-shrink: 0;
}
.switch-track::after {
    content: '';
    position: absolute;
    top: 2px; left: 2px;
    width: 18px; height: 18px;
    background: #fff;
    border-radius: 50%;
    box-shadow: 0 1px 3px rgba(0,0,0,.2);
    transition: transform .15s;
}
.switch input:checked + .switch-track { background: var(--success); }
.switch input:checked + .switch-track::after { transform: translateX(16px); }
.switch-label { margin-left: 10px; font-size: 13px; color: var(--ink-mid); font-weight: 500; }

/* ============================================================
   11. ALERTS / NOTES
============================================================ */
.alert {
    display: flex;
    align-items: flex-start;
    gap: 11px;
    padding: 12px 14px;
    border-radius: var(--radius);
    border: 1px solid;
    font-size: 13px;
    margin-bottom: 14px;
}
.alert svg { width: 18px; height: 18px; flex-shrink: 0; margin-top: 1px; }
.alert.info    { background: var(--info-soft);    border-color: var(--info-mid);    color: #1e40af; }
.alert.success { background: var(--success-soft); border-color: var(--success-mid); color: #065f46; }
.alert.warn    { background: var(--warning-soft); border-color: var(--warning-mid); color: #92400e; }
.alert.danger  { background: var(--danger-soft);  border-color: var(--danger-mid);  color: #991b1b; }

/* ============================================================
   12. EMPTY STATES
============================================================ */
.empty {
    padding: 36px 20px;
    text-align: center;
    color: var(--ink-light);
}
.empty-icon {
    width: 48px; height: 48px;
    background: var(--bg-row);
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--ink-faint);
    margin-bottom: 10px;
}
.empty-icon svg { width: 22px; height: 22px; }
.empty-title { font-size: 13px; font-weight: 600; color: var(--ink-mid); }
.empty-sub { font-size: 12px; color: var(--ink-light); margin-top: 3px; }

/* ============================================================
   13. RESPONSIVE
============================================================ */
@media (max-width: 900px) {
    :root { --sb-width: 240px; }

    .app-sidebar {
        transform: translateX(-100%);
        box-shadow: 4px 0 24px rgba(0,0,0,.25);
    }
    .app-sidebar.open { transform: translateX(0); }
    .sb-overlay.open { display: block; }
    .sb-toggle { display: inline-flex; }

    .app-shell { margin-left: 0; }
    .app-topbar { padding: 0 16px 0 60px; }
    .app-content { padding: 16px 14px 32px; }

    .page-title { font-size: 18px; }
    .kpi { padding: 13px 14px; }
    .kpi-value { font-size: 20px; }
}

/* Print */
@media print {
    .app-sidebar, .sb-toggle, .sb-overlay, .app-topbar { display: none !important; }
    .app-shell { margin-left: 0; }
    .app-content { padding: 0; }
}