/* Tierguard design system — refined light + mono-data. Self-contained, no external fonts. */

:root {
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #f1f4f8;
  --ink: #0b1220;
  --body: #384252;
  --muted: #5b6675;
  --border: #e5e9f0;
  --border-strong: #cbd3df;

  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-ink: #ffffff;
  --accent-subtle: #eef1ff;
  --accent-border: #c9cffb;

  --success: #047857; --success-subtle: #ecfdf5; --success-border: #a7f3d0;
  --warn: #b45309;    --warn-subtle: #fffbeb; --warn-border: #fde68a;
  --danger: #b91c1c;  --danger-subtle: #fef2f2; --danger-border: #fecaca;

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 2px rgba(11,18,32,.05), 0 1px 3px rgba(11,18,32,.05);
  --shadow-md: 0 6px 20px -6px rgba(11,18,32,.12), 0 2px 6px -2px rgba(11,18,32,.06);
  --ring: 0 0 0 3px rgba(79,70,229,.28);
  --tap: 0.55rem;
  --shell: 960px;
}

*, *::before, *::after { box-sizing: border-box; }

body {
  font-family: var(--font-sans);
  margin: 0;
  padding: 0;
  line-height: 1.6;
  color: var(--body);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 { color: var(--ink); letter-spacing: -0.02em; line-height: 1.18; }
a { color: var(--accent); }
::selection { background: var(--accent); color: #fff; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 3px; }
main:focus { outline: none; }
code, kbd, pre, .mono { font-family: var(--font-mono); }
.tnum { font-variant-numeric: tabular-nums; }
.muted { color: var(--muted); }

/* ---- Shell ---- */
#main { max-width: var(--shell); margin: 0 auto; padding: 2.25rem 1.5rem 4.5rem; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--accent); color: #fff; padding: 0.6rem 1rem;
  border-radius: 0 0 var(--radius) 0; text-decoration: none; font-weight: 600;
}
.skip-link:focus { left: 0; }

.site-header {
  display: flex; align-items: center; gap: 0.6rem;
  max-width: var(--shell); margin: 0 auto; padding: 1.05rem 1.5rem;
  border-bottom: 1px solid var(--border);
}
.site-header .brand { display: flex; align-items: center; gap: 0.55rem; text-decoration: none; color: var(--ink); }
.site-header svg { display: block; }
.site-header .wordmark { font-size: 1.2rem; font-weight: 700; letter-spacing: -0.02em; }
.site-header .brand-tag {
  font-family: var(--font-mono); color: var(--muted); font-size: 0.68rem; font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.08em;
  padding-left: 0.6rem; margin-left: 0.45rem; border-left: 1px solid var(--border-strong);
}
@media (max-width: 560px) { .site-header .brand-tag { display: none; } }
.site-header nav { margin-left: auto; display: flex; gap: 1.1rem; align-items: center; }
.site-header nav a { text-decoration: none; color: var(--body); font-weight: 600; font-size: 0.9rem; }
.site-header nav a:hover { color: var(--accent); }

/* ---- Page header ---- */
.page-head { margin-bottom: 1.75rem; }
.page-head h1 { font-size: 1.7rem; margin: 0 0 0.35rem; }
.page-head .sub { color: var(--muted); font-size: 0.92rem; margin: 0; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem;
  font: inherit; font-weight: 600; font-size: 0.92rem; line-height: 1;
  padding: var(--tap) 1rem; border-radius: var(--radius-sm);
  border: 1px solid transparent; background: var(--accent); color: var(--accent-ink);
  text-decoration: none; cursor: pointer; transition: background .15s, border-color .15s, box-shadow .15s, transform .04s;
  white-space: nowrap;
}
.btn:hover { background: var(--accent-hover); }
.btn:active { transform: translateY(1px); }
.btn.secondary { background: var(--surface); color: var(--ink); border-color: var(--border-strong); }
.btn.secondary:hover { background: var(--surface-2); border-color: var(--muted); }
.btn.ghost { background: transparent; color: var(--accent); border-color: transparent; padding-left: 0.4rem; padding-right: 0.4rem; }
.btn.ghost:hover { background: var(--accent-subtle); }
.btn.danger { background: transparent; color: var(--danger); border-color: var(--danger-border); }
.btn.danger:hover { background: var(--danger-subtle); }
.btn.sm { font-size: 0.82rem; padding: 0.4rem 0.7rem; }

/* ---- Cards / panels ---- */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 1.4rem 1.5rem; box-shadow: var(--shadow-sm);
  margin-bottom: 1.25rem;
}
.card > h2, .card > h3 { margin-top: 0; }
.card-title { font-size: 1.02rem; font-weight: 700; color: var(--ink); margin: 0 0 0.9rem; letter-spacing: -0.01em; }
.eyebrow { font-family: var(--font-mono); font-size: 0.68rem; font-weight: 600; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--muted); margin: 0 0 0.4rem; }

/* ---- Forms ---- */
.field { display: flex; flex-direction: column; gap: 0.3rem; margin-bottom: 0.9rem; }
.field label, .label { font-size: 0.85rem; font-weight: 600; color: var(--ink); }
.input, input[type=text], input[type=email], input[type=password], input[type=number], select, textarea {
  font: inherit; font-size: 0.95rem; color: var(--ink); background: var(--surface);
  padding: 0.55rem 0.7rem; border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  width: 100%; transition: border-color .15s, box-shadow .15s;
}
.input:focus, input:focus, select:focus, textarea:focus { outline: none; border-color: var(--accent); box-shadow: var(--ring); }
.form-row { display: flex; gap: 0.6rem; flex-wrap: wrap; align-items: flex-end; }
.form-row .field { margin-bottom: 0; }

/* ---- Tables ---- */
.table { width: 100%; border-collapse: separate; border-spacing: 0; font-size: 0.92rem; }
.table th, .table td { text-align: left; padding: 0.7rem 0.85rem; border-bottom: 1px solid var(--border); overflow-wrap: anywhere; }
.table thead th { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); font-weight: 600; border-bottom: 1px solid var(--border-strong); }
.table tbody tr:last-child td { border-bottom: none; }
.table tbody tr:hover td { background: var(--surface-2); }
.table .num { text-align: right; font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* ---- Badges / pills ---- */
.badge { display: inline-flex; align-items: center; gap: 0.3rem; font-size: 0.72rem; font-weight: 600;
  padding: 0.16rem 0.5rem; border-radius: 999px; background: var(--surface-2); color: var(--muted); border: 1px solid var(--border); }
.badge.accent { background: var(--accent-subtle); color: var(--accent); border-color: var(--accent-border); }
.badge.ok { background: var(--success-subtle); color: var(--success); border-color: var(--success-border); }
.badge.warn { background: var(--warn-subtle); color: var(--warn); border-color: var(--warn-border); }
.badge.off { background: var(--surface-2); color: var(--muted); }

/* ---- Metric tiles ---- */
.metric-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 0.9rem; }
.metric { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 0.95rem 1.05rem; }
.metric .label { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); font-weight: 600; }
.metric .value { font-family: var(--font-mono); font-variant-numeric: tabular-nums; font-size: 1.45rem; font-weight: 600; color: var(--ink); margin-top: 0.25rem; }

/* ---- Banners ---- */
.banner { border-radius: var(--radius); padding: 0.7rem 0.95rem; font-size: 0.9rem; margin-bottom: 1rem; border: 1px solid; }
.banner.info { background: var(--accent-subtle); border-color: var(--accent-border); color: #3730a3; }
.banner.warn { background: var(--warn-subtle); border-color: var(--warn-border); color: var(--warn); }
.banner.error { background: var(--danger-subtle); border-color: var(--danger-border); color: var(--danger); }
.banner.ok { background: var(--success-subtle); border-color: var(--success-border); color: var(--success); }

/* ---- Code / snippet ---- */
code { background: var(--surface-2); padding: 0.12rem 0.4rem; border-radius: var(--radius-sm); font-size: 0.86em; color: var(--ink); overflow-wrap: anywhere; }
pre { background: #0b1220; color: #dbe4f0; padding: 1rem 1.1rem; border-radius: var(--radius); overflow-x: auto; font-size: 0.82rem; line-height: 1.55; }
pre code { background: none; padding: 0; color: inherit; font-size: inherit; }

/* ---- Misc ---- */
.empty { color: var(--muted); font-size: 0.92rem; }
.inline-form { display: inline; }
.stack > * + * { margin-top: 0.75rem; }
.row-between { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
hr.rule { border: none; border-top: 1px solid var(--border); margin: 1.5rem 0; }