/* =====================================================================
   admin.css  -  Admin Portal design system (T14)
   Light, professional SaaS aesthetic. Design tokens + layout shell + the shared
   component primitives. Dark mode is intentionally not included (not present in
   the existing project). Tokens are defined once so future pages stay consistent.
   ===================================================================== */
:root {
  --c-bg: #f6f7f9;            --c-surface: #ffffff;      --c-surface-2: #fbfbfd;
  --c-border: #e4e7ec;        --c-border-strong: #d0d5dd;
  --c-text: #1a2233;         --c-text-muted: #667085;   --c-text-subtle: #98a2b3;
  --c-accent: #4f46e5;        --c-accent-weak: #eef2ff;  --c-accent-text: #ffffff;
  --c-info: #2563eb;          --c-info-weak: #eff6ff;
  --c-success: #067647;       --c-success-weak: #ecfdf3;
  --c-warning: #b54708;       --c-warning-weak: #fffaeb;
  --c-danger: #b42318;        --c-danger-weak: #fef3f2;
  --sp-1: 4px; --sp-2: 8px; --sp-3: 12px; --sp-4: 16px; --sp-5: 24px; --sp-6: 32px; --sp-8: 48px;
  --radius: 10px; --radius-sm: 6px; --radius-pill: 999px;
  --shadow-sm: 0 1px 2px rgba(16,24,40,.06); --shadow: 0 1px 3px rgba(16,24,40,.1), 0 1px 2px rgba(16,24,40,.06);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --topnav-h: 56px; --sidebar-w: 232px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body { font-family: var(--font); color: var(--c-text); background: var(--c-bg); font-size: 14px; line-height: 1.5; -webkit-font-smoothing: antialiased; }
a { color: var(--c-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { margin: 0; font-weight: 650; letter-spacing: -0.01em; }
:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 2px; border-radius: var(--radius-sm); }
.skip-link { position: absolute; left: -9999px; top: 0; background: var(--c-accent); color: #fff; padding: var(--sp-2) var(--sp-4); z-index: 100; }
.skip-link:focus { left: var(--sp-3); top: var(--sp-3); }

/* ---- shell ---- */
.admin-shell { min-height: 100vh; display: flex; flex-direction: column; }
.topnav { height: var(--topnav-h); display: flex; align-items: center; gap: var(--sp-3); padding: 0 var(--sp-5);
  background: var(--c-surface); border-bottom: 1px solid var(--c-border); position: sticky; top: 0; z-index: 20; }
.brand { font-weight: 700; letter-spacing: -0.02em; display: inline-flex; align-items: center; gap: var(--sp-2); }
.brand-mark { color: var(--c-accent); font-size: 18px; }
.brand-sub { color: var(--c-text-muted); font-weight: 500; }
.topnav-spacer { flex: 1; }
.nav-toggle { display: none; background: none; border: 1px solid var(--c-border); border-radius: var(--radius-sm); height: 34px; width: 38px; font-size: 16px; cursor: pointer; }
.user-chip { display: inline-flex; align-items: center; gap: var(--sp-2); }
.user-role { color: var(--c-text-muted); text-transform: capitalize; font-size: 13px; }
.user-avatar { width: 30px; height: 30px; border-radius: var(--radius-pill); background: var(--c-accent-weak); color: var(--c-accent);
  display: inline-flex; align-items: center; justify-content: center; font-weight: 700; }
.shell-body { flex: 1; display: grid; grid-template-columns: var(--sidebar-w) 1fr; }

/* ---- sidebar ---- */
.sidebar { background: var(--c-surface); border-right: 1px solid var(--c-border); padding: var(--sp-4) var(--sp-3); }
.nav-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 2px; }
.nav-link { display: flex; align-items: center; justify-content: space-between; padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-sm); color: var(--c-text); font-weight: 500; }
.nav-link:hover { background: var(--c-surface-2); text-decoration: none; }
.nav-link-active { background: var(--c-accent-weak); color: var(--c-accent); font-weight: 650; }
.nav-link-disabled { color: var(--c-text-subtle); cursor: default; }
.nav-link-disabled:hover { background: none; }
.nav-soon { font-size: 10px; text-transform: uppercase; letter-spacing: .04em; color: var(--c-text-subtle);
  border: 1px solid var(--c-border); border-radius: var(--radius-pill); padding: 1px 6px; }

/* ---- content ---- */
.content { padding: var(--sp-5) var(--sp-6); min-width: 0; outline: none; }
.breadcrumbs { margin-bottom: var(--sp-4); }
.crumb-list { list-style: none; display: flex; gap: var(--sp-2); margin: 0; padding: 0; color: var(--c-text-muted); font-size: 13px; }
.crumb-sep { color: var(--c-text-subtle); margin-left: var(--sp-2); }
.content-inner { max-width: 1200px; }

/* ---- page ---- */
.page-header { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--sp-4); margin-bottom: var(--sp-5); }
.page-title { font-size: 22px; }
.page-description { color: var(--c-text-muted); margin: var(--sp-1) 0 0; }
.page-content { display: flex; flex-direction: column; gap: var(--sp-6); }

/* ---- section ---- */
.section-header { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: var(--sp-3); }
.section-title { font-size: 15px; text-transform: uppercase; letter-spacing: .04em; color: var(--c-text-muted); }
.section-description { color: var(--c-text-muted); margin: var(--sp-1) 0 0; }

/* ---- cards / metrics ---- */
.card { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius); box-shadow: var(--shadow-sm); }
.card-header { display: flex; align-items: center; justify-content: space-between; padding: var(--sp-3) var(--sp-4); border-bottom: 1px solid var(--c-border); }
.card-title { font-size: 14px; }
.card-body { padding: var(--sp-4); }
.metric-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: var(--sp-4); }
.metric-card { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius);
  padding: var(--sp-4); display: flex; flex-direction: column; gap: var(--sp-1); box-shadow: var(--shadow-sm); }
.metric-label { color: var(--c-text-muted); font-size: 13px; }
.metric-value { font-size: 28px; font-weight: 700; letter-spacing: -0.02em; }
.metric-hint { color: var(--c-text-subtle); font-size: 12px; }
.metric-danger .metric-value { color: var(--c-danger); }

/* ---- badges ---- */
.badge { display: inline-flex; align-items: center; padding: 2px 8px; border-radius: var(--radius-pill);
  font-size: 12px; font-weight: 600; background: #f2f4f7; color: var(--c-text-muted); }
.badge-info { background: var(--c-info-weak); color: var(--c-info); }
.badge-success { background: var(--c-success-weak); color: var(--c-success); }
.badge-warning { background: var(--c-warning-weak); color: var(--c-warning); }
.badge-danger { background: var(--c-danger-weak); color: var(--c-danger); }

/* ---- alerts ---- */
.alert-stack { display: flex; flex-direction: column; gap: var(--sp-3); }
.alert { display: flex; gap: var(--sp-2); align-items: baseline; padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius); border: 1px solid var(--c-border); background: var(--c-surface); }
.alert-title { text-transform: capitalize; }
.alert-info { background: var(--c-info-weak); border-color: #bfdbfe; }
.alert-warning { background: var(--c-warning-weak); border-color: #fde68a; }
.alert-error { background: var(--c-danger-weak); border-color: #fecaca; }

/* ---- table ---- */
.table { width: 100%; border-collapse: collapse; background: var(--c-surface); border: 1px solid var(--c-border);
  border-radius: var(--radius); overflow: hidden; }
.table caption { text-align: left; padding: var(--sp-3) var(--sp-4); color: var(--c-text-muted); font-size: 13px; caption-side: top; }
.table th, .table td { text-align: left; padding: var(--sp-3) var(--sp-4); border-bottom: 1px solid var(--c-border); }
.table th { background: var(--c-surface-2); color: var(--c-text-muted); font-size: 12px; text-transform: uppercase; letter-spacing: .04em; }
.table tbody tr:last-child td { border-bottom: none; }

/* ---- states ---- */
.state { display: flex; flex-direction: column; align-items: flex-start; gap: var(--sp-2); padding: var(--sp-6);
  background: var(--c-surface); border: 1px dashed var(--c-border-strong); border-radius: var(--radius); color: var(--c-text-muted); }
.state-title { color: var(--c-text); font-size: 15px; }
.state-code { font-family: ui-monospace, monospace; font-size: 12px; color: var(--c-text-subtle); }
.spinner { display: inline-block; border: 2px solid var(--c-border-strong); border-top-color: var(--c-accent);
  border-radius: 50%; animation: spin .7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.skeleton { display: flex; flex-direction: column; gap: var(--sp-2); width: 100%; }
.skeleton-bar { display: block; background: linear-gradient(90deg, #eceff3 25%, #f5f6f8 37%, #eceff3 63%); border-radius: var(--radius-sm); }

/* ---- buttons ---- */
.btn { font: inherit; font-weight: 600; border-radius: var(--radius-sm); padding: var(--sp-2) var(--sp-4); cursor: pointer; border: 1px solid transparent; }
.btn-secondary { background: var(--c-surface); border-color: var(--c-border-strong); color: var(--c-text); }
.btn-secondary:hover { background: var(--c-surface-2); }

/* ---- responsive: collapse sidebar under a toggle ---- */
@media (max-width: 860px) {
  .shell-body { grid-template-columns: 1fr; }
  .nav-toggle { display: inline-block; }
  .sidebar { position: fixed; top: var(--topnav-h); bottom: 0; left: 0; width: var(--sidebar-w);
    transform: translateX(-100%); transition: transform .2s ease; z-index: 30; }
  .sidebar-open { transform: translateX(0); box-shadow: var(--shadow); }
  .content { padding: var(--sp-4); }
}

/* ---- auth screens (T15) ---- */
.auth-screen { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: var(--c-bg); padding: var(--sp-5); }
.auth-card { width: 100%; max-width: 380px; background: var(--c-surface); border: 1px solid var(--c-border);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: var(--sp-6); display: flex; flex-direction: column; gap: var(--sp-3); }
.auth-brand { font-weight: 700; display: inline-flex; align-items: center; gap: var(--sp-2); color: var(--c-text); }
.auth-title { font-size: 20px; }
.auth-subtitle { color: var(--c-text-muted); margin: 0; }
.auth-form { display: flex; flex-direction: column; gap: var(--sp-4); margin-top: var(--sp-2); }
.field { display: flex; flex-direction: column; gap: var(--sp-1); }
.field-label { font-size: 13px; color: var(--c-text-muted); font-weight: 600; }
.field-input { font: inherit; padding: var(--sp-2) var(--sp-3); border: 1px solid var(--c-border-strong); border-radius: var(--radius-sm); background: var(--c-surface); color: var(--c-text); }
.field-input:disabled { background: var(--c-surface-2); color: var(--c-text-subtle); }
.btn-primary { background: var(--c-accent); color: var(--c-accent-text); border-color: var(--c-accent); display: inline-flex; align-items: center; justify-content: center; gap: var(--sp-2); }
.btn-primary:hover { filter: brightness(1.05); }
.btn-primary:disabled { opacity: .7; cursor: default; }
.auth-submit { margin-top: var(--sp-2); }
.signout-btn { margin-left: var(--sp-3); }

/* ---- courses list: sortable headers + pagination (T17) ---- */
.th-sort { font: inherit; font-weight: inherit; color: inherit; background: none; border: none; padding: 0; cursor: pointer; display: inline-flex; align-items: center; gap: 4px; text-transform: inherit; letter-spacing: inherit; }
.th-sort:hover { color: var(--c-accent); }
.th-sort:disabled { cursor: default; opacity: .6; }
.th-sort-active { color: var(--c-accent); }
.sort-arrow { font-size: 10px; }
.cell-slug { font-family: ui-monospace, monospace; font-size: 12px; color: var(--c-text-muted); background: var(--c-surface-2); padding: 1px 6px; border-radius: var(--radius-sm); }
.cell-muted { color: var(--c-text-subtle); }
.courses-table.is-busy { opacity: .6; pointer-events: none; }
.pagination { display: flex; align-items: center; justify-content: space-between; gap: var(--sp-4); margin-top: var(--sp-4); flex-wrap: wrap; }
.page-size-label { color: var(--c-text-muted); font-size: 13px; display: inline-flex; align-items: center; gap: var(--sp-2); }
.page-size-select { font: inherit; padding: var(--sp-1) var(--sp-2); border: 1px solid var(--c-border-strong); border-radius: var(--radius-sm); background: var(--c-surface); }
.page-status { color: var(--c-text-muted); font-size: 13px; }
.page-buttons { display: inline-flex; gap: var(--sp-2); }

/* ---- course detail (T18) ---- */
.course-link { font-weight: 600; }
.version-link { font-weight: 600; }
.version-link-selected { text-decoration: underline; }
.version-link-selected::before { content: "\25B6 "; color: var(--c-accent); }
.detail-grid { margin: 0; display: grid; grid-template-columns: 1fr; gap: 0; }
.detail-row { display: grid; grid-template-columns: 160px 1fr; gap: var(--sp-3); padding: var(--sp-2) 0; border-bottom: 1px solid var(--c-border); }
.detail-row:last-child { border-bottom: none; }
.detail-row dt { color: var(--c-text-muted); font-weight: 600; margin: 0; }
.detail-row dd { margin: 0; }
.op-summary { display: flex; flex-wrap: wrap; align-items: center; gap: var(--sp-2); }
.op-total { font-weight: 650; margin-right: var(--sp-2); }
.action-area { display: flex; flex-wrap: wrap; gap: var(--sp-2); }
.action-future { display: inline-flex; align-items: center; gap: var(--sp-2); }
.action-soon { font-size: 10px; text-transform: uppercase; letter-spacing: .04em; color: var(--c-text-subtle); border: 1px solid var(--c-border); border-radius: var(--radius-pill); padding: 1px 6px; }