:root {
    --color-bg: #f4f5f7;
    --color-fg: #1a1d21;
    --color-muted: #6b7280;
    --color-border: #e5e7eb;
    --color-card: #ffffff;
    --color-sidebar: #1f2937;
    --color-sidebar-fg: #e5e7eb;
    --color-sidebar-muted: #9ca3af;
    --color-sidebar-active: #4f46e5;
    --color-accent: #4f46e5;
    --color-accent-hover: #4338ca;
    --color-success: #16a34a;
    --color-success-hover: #15803d;
    --color-danger: #b91c1c;
    --color-danger-hover: #991b1b;
    --color-warn-bg: #fef3c7;
    --color-warn-fg: #92400e;
    --color-info-bg: #dbeafe;
    --color-info-fg: #1e3a8a;
    --color-ok-bg: #dcfce7;
    --color-ok-fg: #166534;
    --color-err-bg: #fee2e2;
    --color-err-fg: #991b1b;
    --radius: 8px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
    --shadow: 0 1px 3px rgba(15, 23, 42, 0.06), 0 4px 12px rgba(15, 23, 42, 0.05);
    --sidebar-w: 260px;
    --topbar-h: 56px;
    font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
    margin: 0;
    background: var(--color-bg);
    color: var(--color-fg);
    line-height: 1.5;
    font-size: 14px;
}
a { color: var(--color-accent); }

/* ============ App shell ============ */
.app {
    display: grid;
    grid-template-columns: var(--sidebar-w) 1fr;
    grid-template-rows: var(--topbar-h) 1fr;
    grid-template-areas:
        "sidebar topbar"
        "sidebar main";
    min-height: 100vh;
}
.topbar {
    grid-area: topbar;
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 24px;
    background: var(--color-card);
    border-bottom: 1px solid var(--color-border);
}
.topbar .page-title { font-weight: 600; font-size: 16px; }
.topbar .user-area { display: flex; align-items: center; gap: 12px; }
.topbar .user-pill {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 6px 12px; border-radius: 999px;
    background: var(--color-bg); color: var(--color-fg);
    font-size: 13px;
}
.topbar .user-pill .role {
    text-transform: uppercase; font-size: 11px; font-weight: 600;
    color: var(--color-accent);
}
.sidebar {
    grid-area: sidebar;
    background: var(--color-sidebar); color: var(--color-sidebar-fg);
    padding: 0;
    overflow-y: auto;
}
.sidebar .brand {
    padding: 16px 20px;
    font-weight: 600; font-size: 18px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    display: flex; align-items: center; gap: 10px;
    height: var(--topbar-h);
}
.sidebar .brand .logo {
    display: inline-flex; align-items: center; justify-content: center;
    width: 28px; height: 28px; border-radius: 6px;
    background: var(--color-accent); color: #fff; font-size: 14px; font-weight: 700;
}
.sidebar .section { padding: 16px 12px 8px; }
.sidebar .section-title {
    padding: 0 8px 8px; font-size: 11px; letter-spacing: 0.06em;
    text-transform: uppercase; color: var(--color-sidebar-muted);
}
.sidebar .nav-btn {
    display: flex; align-items: center; gap: 10px;
    width: 100%; padding: 9px 12px;
    border: none; background: transparent; color: var(--color-sidebar-fg);
    border-radius: 6px; cursor: pointer; font: inherit; text-align: left;
}
.sidebar .nav-btn:hover { background: rgba(255,255,255,0.06); }
.sidebar .nav-btn.active {
    background: var(--color-sidebar-active); color: #fff; font-weight: 500;
}
.sidebar .nav-btn .icon { font-size: 14px; width: 18px; text-align: center; opacity: 0.85; }
main {
    grid-area: main;
    padding: 24px;
    overflow-x: auto;
}
.content { max-width: 1100px; margin: 0 auto; }
.content.narrow { max-width: 720px; }

/* ============ Auth (no sidebar) layout ============ */
.auth-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}
.auth-shell > .topbar {
    grid-area: auto;
    flex: 0 0 var(--topbar-h);
    padding: 0 24px;
    background: var(--color-card);
    border-bottom: 1px solid var(--color-border);
    display: flex; align-items: center; justify-content: space-between;
}
.auth-shell .topbar .brand { font-weight: 600; font-size: 18px; display: flex; align-items: center; gap: 10px; }
.auth-shell .topbar .brand .logo {
    display: inline-flex; align-items: center; justify-content: center;
    width: 28px; height: 28px; border-radius: 6px; background: var(--color-accent); color: #fff; font-weight: 700;
}
.auth-shell > main {
    grid-area: auto;
    flex: 1 1 auto;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 48px 16px;
    overflow: auto;
}
.auth-shell .content {
    width: 100%;
    max-width: 440px;
    margin: 0;
}

/* ============ Panels ============ */
.panel, .card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: 16px;
    overflow: hidden;
}
.panel-header, .card > h1, .card > h2 {
    padding: 14px 20px;
    border-bottom: 1px solid var(--color-border);
    display: flex; align-items: center; justify-content: space-between; gap: 12px;
    margin: 0;
}
.panel-header h2, .panel-header h1 { margin: 0; font-size: 16px; font-weight: 600; }
.panel-header .subtitle { color: var(--color-muted); font-size: 13px; font-weight: 400; }
.panel-body, .card > *:not(h1):not(h2):not(.panel-header) { padding: 16px 20px; }
.panel-body > *:first-child { margin-top: 0; }
.panel-body > *:last-child { margin-bottom: 0; }
.card > h1, .card > h2 { font-size: 16px; font-weight: 600; }

/* compact panel grid */
.grid { display: grid; gap: 16px; }
.grid.cols-2 { grid-template-columns: 1fr 1fr; }
@media (max-width: 800px) { .grid.cols-2 { grid-template-columns: 1fr; } }

/* ============ Buttons ============ */
.btn, button.primary, button {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    padding: 8px 14px;
    border: 1px solid var(--color-border);
    background: var(--color-card);
    color: var(--color-fg);
    border-radius: var(--radius);
    cursor: pointer; font: inherit; font-weight: 500;
    transition: background 0.15s, border-color 0.15s;
}
.btn:hover, button:hover { background: #f9fafb; }
.btn:disabled, button:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary, button.primary {
    background: var(--color-accent); border-color: var(--color-accent); color: #fff;
}
.btn-primary:hover, button.primary:hover { background: var(--color-accent-hover); border-color: var(--color-accent-hover); }

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

.btn-danger { background: var(--color-card); border-color: var(--color-danger); color: var(--color-danger); }
.btn-danger:hover { background: var(--color-err-bg); }

.btn-ghost { background: transparent; border-color: transparent; color: var(--color-accent); }
.btn-ghost:hover { background: var(--color-bg); }

.btn-sm { padding: 4px 10px; font-size: 13px; }
.btn-block { width: 100%; }

/* button row */
.toolbar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.toolbar.justify-end { justify-content: flex-end; }

/* ============ Forms ============ */
form label {
    display: block; margin: 12px 0 4px;
    color: var(--color-muted); font-size: 13px;
}
form input, form select, form textarea {
    width: 100%;
    padding: 9px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-card);
    font: inherit;
    color: var(--color-fg);
}
form textarea { min-height: 96px; resize: vertical; }
form input:focus, form select:focus, form textarea:focus {
    outline: 2px solid var(--color-accent); outline-offset: 1px;
    border-color: var(--color-accent);
}
form .form-row { display: flex; gap: 8px; align-items: flex-end; }
form .form-row > * { flex: 1; }
form .form-row > button { flex: 0 0 auto; margin: 0; }
form .form-actions { margin-top: 16px; display: flex; gap: 8px; }

/* ============ Tables ============ */
table {
    width: 100%; border-collapse: collapse;
    font-size: 13px;
    background: var(--color-card);
}
table thead th {
    text-align: left; font-weight: 600; color: var(--color-muted);
    padding: 10px 12px; border-bottom: 1px solid var(--color-border);
    background: #fafafa;
    font-size: 12px; text-transform: uppercase; letter-spacing: 0.04em;
}
table tbody td {
    padding: 12px; border-bottom: 1px solid var(--color-border); vertical-align: middle;
}
table tbody tr:last-child td { border-bottom: none; }
table tbody tr:hover { background: #fafafa; }
table .actions { display: flex; gap: 6px; justify-content: flex-end; }
table.compact tbody td { padding: 8px 12px; }

/* ============ Badges (status) ============ */
.badge {
    display: inline-flex; align-items: center; padding: 2px 10px;
    border-radius: 999px; font-size: 12px; font-weight: 500;
    background: var(--color-bg); color: var(--color-muted);
    text-transform: lowercase;
}
.badge.draft { background: #f3f4f6; color: #4b5563; }
.badge.active { background: var(--color-info-bg); color: var(--color-info-fg); }
.badge.completed { background: var(--color-ok-bg); color: var(--color-ok-fg); }
.badge.cancelled { background: #f3f4f6; color: var(--color-muted); }
.badge.pending { background: var(--color-warn-bg); color: var(--color-warn-fg); }
.badge.confirmed { background: var(--color-ok-bg); color: var(--color-ok-fg); }
.badge.rejected, .badge.overdue { background: var(--color-err-bg); color: var(--color-err-fg); }
.badge.approved { background: var(--color-ok-bg); color: var(--color-ok-fg); }
.badge.revoked { background: #f3f4f6; color: var(--color-muted); }

/* ============ Tile grid (dashboard) ============ */
.tile-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
}
.tile {
    display: flex; flex-direction: column; gap: 6px;
    align-items: flex-start; text-align: left;
    padding: 18px 20px;
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    font: inherit; color: var(--color-fg);
    transition: border-color 0.15s, transform 0.05s, box-shadow 0.15s;
    box-shadow: var(--shadow-sm);
}
.tile:hover { border-color: var(--color-accent); box-shadow: var(--shadow); }
.tile:active { transform: translateY(1px); }
.tile .tile-icon { font-size: 22px; }
.tile .tile-title { font-weight: 600; font-size: 15px; }
.tile .tile-desc { color: var(--color-muted); font-size: 13px; }

/* ============ Lists ============ */
ul.clean { list-style: none; padding: 0; margin: 0; }
ul.clean li {
    padding: 10px 0; border-bottom: 1px solid var(--color-border);
    display: flex; align-items: center; justify-content: space-between; gap: 8px;
}
ul.clean li:last-child { border-bottom: none; }

/* ============ Misc ============ */
.muted { color: var(--color-muted); font-size: 13px; }
.error, p.error {
    color: var(--color-err-fg);
    background: var(--color-err-bg);
    border: 1px solid #fecaca;
    border-radius: var(--radius);
    padding: 8px 12px; margin: 12px 0;
    min-height: 0;
    font-size: 13px;
}
.error:empty, p.error:empty { display: none; }
.note {
    background: var(--color-info-bg); color: var(--color-info-fg);
    border-radius: var(--radius); padding: 10px 12px; font-size: 13px;
    margin: 0 0 12px;
}
.note.success { background: var(--color-ok-bg); color: var(--color-ok-fg); }
.note.warn { background: var(--color-warn-bg); color: var(--color-warn-fg); }

pre.body, pre {
    background: #0f172a; color: #e2e8f0;
    padding: 14px 16px; border-radius: var(--radius);
    white-space: pre-wrap; word-break: break-word;
    font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
    font-size: 12.5px; line-height: 1.55;
    overflow: auto;
}
pre.body.light {
    background: #f8fafc; color: #0f172a;
    border: 1px solid var(--color-border);
}

code {
    background: var(--color-bg); padding: 1px 6px; border-radius: 4px;
    font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
    font-size: 12.5px;
}

/* hide-on-mobile etc */
@media (max-width: 720px) {
    .app { grid-template-columns: 1fr; grid-template-areas: "topbar" "main"; }
    .sidebar { display: none; }
}