:root {
    --bg: #f3f4f6;
    --card: #ffffff;
    --text: #0f172a;
    --muted: #64748b;
    --primary: #1d4ed8;
    --danger: #b91c1c;
    --ok: #166534;
    --border: #e2e8f0;
    --sidebar-bg: #0f172a;
    --sidebar-text: #cbd5e1;
    --sidebar-active: #1e293b;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
}

.container {
    width: min(1200px, 94%);
    margin: 0 auto;
    padding: 1rem 0;
}

.public-topbar,
.topbar {
    background: #0f172a;
    color: #fff;
}

.topbar-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.app-shell {
    min-height: 100dvh;
    display: grid;
    grid-template-columns: 260px 1fr;
}

.sidebar {
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    padding: 1rem .75rem;
    border-right: 1px solid #1e293b;
    position: sticky;
    top: 0;
    height: 100dvh;
    overflow-y: auto;
}

.sidebar-brand {
    font-weight: 700;
    color: #fff;
    margin-bottom: .8rem;
    padding: .5rem .6rem;
}

.side-nav { display: grid; gap: .35rem; }

.side-group summary {
    cursor: pointer;
    list-style: none;
    color: #94a3b8;
    font-size: .82rem;
    text-transform: uppercase;
    letter-spacing: .05em;
    padding: .45rem .6rem;
}

.side-link {
    display: block;
    text-decoration: none;
    color: var(--sidebar-text);
    border-radius: .45rem;
    padding: .45rem .6rem;
}

.side-link:hover,
.side-link.active {
    background: var(--sidebar-active);
    color: #fff;
}

.side-hint {
    display: block;
    color: #64748b;
    padding: .25rem .6rem .5rem;
    font-size: .84rem;
}

.content-wrap { min-width: 0; }

.content-topbar {
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: .75rem;
    background: #fff;
    border-bottom: 1px solid var(--border);
    padding: 0 1rem;
    position: sticky;
    top: 0;
    z-index: 20;
}

.content-main {
    padding: 1rem;
    display: grid;
    gap: 1rem;
}

.topbar-meta {
    display: flex;
    align-items: center;
    gap: .6rem;
    color: #334155;
    font-size: .9rem;
}

.session-pill {
    border: 1px solid var(--border);
    background: #f8fafc;
    border-radius: 999px;
    padding: .2rem .6rem;
}

.session-pill.warn {
    background: #fef3c7;
    color: #92400e;
    border-color: #fcd34d;
}

.session-pill.danger {
    background: #fee2e2;
    color: #991b1b;
    border-color: #fecaca;
}

.sidebar-toggle {
    background: #e2e8f0;
    color: #0f172a;
    border: 1px solid #cbd5e1;
    padding: .4rem .55rem;
}

body.sidebar-collapsed .app-shell { grid-template-columns: 74px 1fr; }
body.sidebar-collapsed .side-group summary,
body.sidebar-collapsed .side-hint,
body.sidebar-collapsed .side-link,
body.sidebar-collapsed .sidebar-brand { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

@media (max-width: 960px) {
    .app-shell { grid-template-columns: 1fr; }
    .sidebar {
        position: fixed;
        left: -280px;
        width: 260px;
        z-index: 30;
        transition: left .2s ease;
    }
    body.sidebar-open .sidebar { left: 0; }
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: .6rem;
    padding: 1rem;
}

.grid.two-col {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

@media (min-width: 880px) {
    .grid.two-col { grid-template-columns: 1fr 1fr; }
}

.stack { display: grid; gap: .75rem; }
.inline-form { display: inline-flex; gap: .5rem; align-items: center; }
.mt { margin-top: .75rem; }

.table-wrap {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    border-bottom: 1px solid var(--border);
    padding: .55rem;
    text-align: left;
    vertical-align: top;
}

.badge {
    display: inline-block;
    font-size: .8rem;
    padding: .2rem .45rem;
    border-radius: 999px;
    background: #eef2ff;
    color: #1e3a8a;
}

.actions {
    display: flex;
    gap: .4rem;
}

input, select, button {
    padding: .55rem .7rem;
    border-radius: .5rem;
    border: 1px solid #cbd5e1;
    font: inherit;
}

button {
    background: var(--primary);
    color: #fff;
    border: none;
    cursor: pointer;
}

button:disabled {
    opacity: .6;
    cursor: not-allowed;
}

.alert {
    margin: .8rem 0;
    padding: .7rem .85rem;
    border-radius: .45rem;
}

.alert-error { background: #fee2e2; color: var(--danger); }
.alert-success { background: #dcfce7; color: var(--ok); }
.muted { color: var(--muted); }

.auth-card {
    width: min(420px, 100%);
    margin: 3rem auto;
}

.top-link {
    color: #1d4ed8;
    text-decoration: none;
    padding: .2rem .4rem;
    border-radius: .3rem;
}

.top-link:hover {
    background: #dbeafe;
    color: #1e3a8a;
}