/* Base UI primitives: AppShell, DataTable, StatCard, Badge, Form, Banner, Toast.
 * System-agnostic and fully tokenised - systems/*.css only shift tokens. */

/* ---- AppShell ---- */
.shell { display: grid; grid-template-columns: 248px 1fr; min-height: 100vh; }
.shell__nav { background: var(--nav-bg); color: var(--nav-fg); padding: var(--space-4) 0; position: sticky; top: 0; height: 100vh; overflow-y: auto; }
.shell__brand { display: flex; align-items: center; gap: var(--space-2); padding: 0 var(--space-4) var(--space-4); font-weight: 700; color: var(--nav-brand-fg); font-size: 15px; }
.shell__brand .dot { width: 10px; height: 10px; border-radius: 3px; background: var(--color-primary); }
.nav-group { padding: var(--space-2) var(--space-4) var(--space-1); font-size: 11px; text-transform: uppercase; letter-spacing: .06em; color: var(--nav-heading); margin-top: var(--space-3); }
.nav-link { display: block; padding: 7px var(--space-4); color: var(--nav-fg); font-size: 13px; border-left: 3px solid transparent; transition: background .12s ease, color .12s ease; }
.nav-link:hover { background: rgba(255,255,255,.05); text-decoration: none; color: var(--nav-active-fg); }
.nav-link.active { background: var(--nav-active-bg); border-left-color: var(--color-primary); color: var(--nav-active-fg); font-weight: 600; }
.nav-link.write::after { content: "write"; float: right; font-size: 10px; color: var(--color-primary); opacity: .85; }

.shell__main { display: flex; flex-direction: column; min-width: 0; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); padding: var(--space-3) var(--space-5); background: var(--color-surface); border-bottom: 1px solid var(--color-border); position: sticky; top: 0; z-index: 5; }
.topbar__title { font-size: 16px; font-weight: 700; }
.topbar__right { display: flex; align-items: center; gap: var(--space-3); }
.topbar__user { font-size: 13px; color: var(--color-muted); }
.content { padding: var(--space-5); max-width: 1200px; width: 100%; }
.page-head { margin-bottom: var(--space-4); }
.page-head h1 { font-size: 20px; margin: 0 0 4px; letter-spacing: -.01em; }
.page-head p { margin: 0; color: var(--color-muted); }

/* ---- Buttons ---- */
.btn { display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--color-border); background: var(--color-surface); color: var(--color-text); padding: 7px 14px; border-radius: var(--radius-sm); font-size: 13px; cursor: pointer; font-family: inherit; transition: background .12s ease, border-color .12s ease; }
.btn:hover { background: var(--color-surface-2); }
.btn--primary { background: var(--color-primary); border-color: var(--color-primary); color: var(--color-primary-ink); font-weight: 600; }
.btn--primary:hover { filter: brightness(.94); background: var(--color-primary); }
.btn--ghost { background: transparent; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* Form elements do not inherit text colour or font from the page; on the dark
   pathfinder skin an unstyled <button> renders near-black on a dark surface. */
button, input, select, textarea { font: inherit; color: inherit; }

/* Anchors styled as buttons: the per-system "a { color: primary }" rule outranks
   .btn and turns primary-button labels primary-on-primary (invisible). These
   carry higher specificity so button text always wins. */
[data-system] a.btn, a.btn { color: var(--color-text); }
[data-system] a.btn--primary, a.btn--primary { color: var(--color-primary-ink); }
a.btn:hover { text-decoration: none; }

/* ---- Card / DataTable ---- */
.card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); box-shadow: var(--shadow-1); margin-bottom: var(--space-5); overflow: hidden; }
.card__head { padding: var(--space-3) var(--space-4); border-bottom: 1px solid var(--color-border); font-weight: 600; display: flex; justify-content: space-between; align-items: center; }
.table-wrap { overflow-x: auto; }
table.dt { width: 100%; border-collapse: collapse; font-size: 13px; }
table.dt th, table.dt td { text-align: left; padding: 9px var(--space-4); border-bottom: 1px solid var(--color-border); white-space: nowrap; }
table.dt th { background: var(--color-surface-2); color: var(--color-muted); font-weight: 600; font-size: 12px; }
table.dt tr:last-child td { border-bottom: none; }
table.dt tbody tr:hover td { background: var(--color-surface-2); }
table.dt tr.row--danger td { background: var(--color-danger-weak); }
table.dt tr.row--warn td { background: var(--color-warn-weak); }
table.dt tr.row--info td { background: var(--color-info-weak); }
table.dt td.num { text-align: right; font-variant-numeric: tabular-nums; font-family: var(--font-mono); }

/* ---- StatCard ---- */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: var(--space-4); margin-bottom: var(--space-5); }
.stat { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: var(--space-4); box-shadow: var(--shadow-1); }
.stat__label { font-size: 12px; color: var(--color-muted); }
.stat__value { font-size: 26px; font-weight: 700; margin: 4px 0 2px; font-variant-numeric: tabular-nums; letter-spacing: -.01em; }
.stat__sub { font-size: 12px; color: var(--color-muted); }
.stat--danger { border-top: 3px solid var(--color-danger); }
.stat--warn { border-top: 3px solid var(--color-warn); }
.stat--ok { border-top: 3px solid var(--color-ok); }

/* ---- Badge / Chip ---- */
.badge { display: inline-flex; align-items: center; gap: 4px; padding: 2px 9px; border-radius: 999px; font-size: 11px; font-weight: 600; line-height: 1.6; }
.badge--ok { background: var(--color-ok-weak); color: var(--color-ok); }
.badge--warn { background: var(--color-warn-weak); color: var(--color-warn); }
.badge--danger { background: var(--color-danger-weak); color: var(--color-danger); }
.badge--info { background: var(--color-info-weak); color: var(--color-info); }
.badge--neutral { background: var(--color-neutral-weak); color: var(--color-muted); }

/* ---- Form ---- */
.form { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: var(--space-5); box-shadow: var(--shadow-1); max-width: 560px; }
.field { margin-bottom: var(--space-4); }
.field label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 4px; }
.field input, .field select, .field textarea { width: 100%; padding: 9px 11px; border: 1px solid var(--color-border); border-radius: var(--radius-sm); font-family: inherit; font-size: 14px; background: var(--color-surface); color: var(--color-text); }
.field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid var(--color-primary-weak); border-color: var(--color-primary); }
.field .hint { font-size: 12px; color: var(--color-muted); margin-top: 4px; }
.field .err { font-size: 12px; color: var(--color-danger); margin-top: 4px; display: none; }
.field.invalid .err { display: block; }
.field.invalid input, .field.invalid select, .field.invalid textarea { border-color: var(--color-danger); }

/* ---- Banner ---- */
.banner { border-radius: var(--radius-sm); padding: var(--space-3) var(--space-4); margin-bottom: var(--space-4); font-size: 13px; border: 1px solid transparent; }
.banner--info { background: var(--color-info-weak); border-color: color-mix(in srgb, var(--color-info) 30%, transparent); color: color-mix(in srgb, var(--color-info) 78%, #000); }
.banner--warn { background: var(--color-warn-weak); border-color: color-mix(in srgb, var(--color-warn) 30%, transparent); color: color-mix(in srgb, var(--color-warn) 82%, #000); }
.banner--danger { background: var(--color-danger-weak); border-color: color-mix(in srgb, var(--color-danger) 30%, transparent); color: color-mix(in srgb, var(--color-danger) 78%, #000); }
.banner--ok { background: var(--color-ok-weak); border-color: color-mix(in srgb, var(--color-ok) 30%, transparent); color: color-mix(in srgb, var(--color-ok) 78%, #000); }
.banner b { font-weight: 700; }

/* ---- Toast ---- */
.toast-host { position: fixed; right: var(--space-5); bottom: var(--space-5); display: flex; flex-direction: column; gap: var(--space-2); z-index: 50; }
.toast { background: var(--toast-bg); color: var(--toast-fg); padding: 11px 16px; border-radius: var(--radius-sm); box-shadow: var(--shadow-2); font-size: 13px; max-width: 380px; animation: toast-in .18s ease; }
.toast--ok { border-left: 4px solid var(--color-ok); }
.toast--danger { border-left: 4px solid var(--color-danger); }
.toast .ref { font-family: var(--font-mono); color: var(--toast-ref); }
@keyframes toast-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* ---- Doc viewer (markdown) ---- */
.doc { padding: var(--space-4) var(--space-5); line-height: 1.6; }
.doc h2 { font-size: 18px; margin: var(--space-4) 0 var(--space-2); }
.doc h3 { font-size: 15px; margin: var(--space-4) 0 var(--space-2); }
.doc h4 { font-size: 13px; text-transform: uppercase; letter-spacing: .03em; color: var(--color-muted); margin: var(--space-3) 0 var(--space-1); }
.doc p { margin: var(--space-2) 0; }
.doc ul { margin: var(--space-2) 0; padding-left: var(--space-5); }
.doc hr { border: none; border-top: 1px solid var(--color-border); margin: var(--space-3) 0; }
.doc code { background: var(--color-neutral-weak); padding: 1px 5px; border-radius: 4px; font-size: 12px; }
.filters { display: flex; gap: var(--space-3); align-items: center; margin-bottom: var(--space-4); flex-wrap: wrap; }
.filters select { padding: 7px 10px; border: 1px solid var(--color-border); border-radius: var(--radius-sm); font-family: inherit; background: var(--color-surface); color: var(--color-text); }

/* ---- Auth pages ---- */
.auth-wrap { min-height: 100vh; display: grid; place-items: center; padding: var(--space-5); }
.auth-card { width: 100%; max-width: 400px; }
.auth-card .form { max-width: none; }
.auth-brand { display: flex; align-items: center; gap: var(--space-2); justify-content: center; font-weight: 800; font-size: 20px; margin-bottom: var(--space-5); }
.auth-brand .dot { width: 16px; height: 16px; border-radius: 4px; background: var(--color-primary); }
.muted { color: var(--color-muted); }
.center { text-align: center; }
.mt-3 { margin-top: var(--space-3); }

/* ---- Picker ---- */
.tier-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
.tier { text-align: left; cursor: pointer; }
.tier h3 { margin: 0 0 4px; }
.tier .badge { margin-bottom: var(--space-2); }

/* ---- Shared helpers (used by effectPanel / actions rows) ---- */
.actions { display: flex; gap: var(--space-2); align-items: center; flex-wrap: wrap; }
.ref { font-family: var(--font-mono); }

@media (max-width: 760px) { .shell { grid-template-columns: 1fr; } .shell__nav { position: static; height: auto; } .tier-grid { grid-template-columns: 1fr; } }