/* =============================================================
   Halo — Dark Design System
   Adapted for Stratum Admin Dashboard
   ============================================================= */

:root {
  --color-background: #0A0B0F;
  --color-surface: #14151C;
  --color-elevated: #1E2029;
  --color-overlay: rgba(10, 11, 15, 0.72);
  --color-border: #2A2D38;
  --color-border-strong: #3A3D4A;
  --color-border-soft: rgba(255, 255, 255, 0.04);
  --color-text-primary: #F2F4F8;
  --color-text-secondary: #9AA0AE;
  --color-text-muted: #5C6170;
  --color-text-inverse: #0A0B0F;
  --color-primary: #5B6BFF;
  --color-primary-hover: #7886FF;
  --color-primary-pressed: #4A59E6;
  --color-primary-soft: rgba(91, 107, 255, 0.12);
  --color-success: #2BE08C;
  --color-warning: #F5D547;
  --color-info: #3DD7E5;
  --color-danger: #FF3A5C;
  --color-success-soft: rgba(43, 224, 140, 0.12);
  --color-warning-soft: rgba(245, 213, 71, 0.14);
  --color-info-soft: rgba(61, 215, 229, 0.14);
  --color-danger-soft: rgba(255, 58, 92, 0.14);

  /* Stratum severity: high uses brand orange */
  --color-high: #E2641C;
  --color-high-soft: rgba(226, 100, 28, 0.14);

  --font-display: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --space-1: 4px; --space-2: 8px; --space-3: 12px; --space-4: 16px;
  --space-5: 20px; --space-6: 24px; --space-8: 32px; --space-10: 40px;
  --space-12: 48px; --space-16: 64px; --space-20: 80px;

  --radius-none: 0px; --radius-sm: 6px; --radius-md: 10px;
  --radius-lg: 16px; --radius-xl: 24px; --radius-full: 999px;

  --border-width: 1px;
  --shadow-sm: 0 1px 0 rgba(255,255,255,0.02) inset, 0 1px 2px rgba(0,0,0,0.4);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.45), 0 1px 0 rgba(255,255,255,0.03) inset;
  --shadow-lg: 0 24px 60px rgba(0,0,0,0.55), 0 1px 0 rgba(255,255,255,0.04) inset;
  --focus-ring: 0 0 0 3px rgba(91, 107, 255, 0.35);
  --motion-fast: 120ms; --motion-base: 150ms; --motion-slow: 240ms;
  --easing-standard: cubic-bezier(0.2, 0.6, 0.2, 1);
  --container-max: 1280px;
  --container-pad: clamp(20px, 4vw, 48px);
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background-color: var(--color-background);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.55;
  letter-spacing: -0.005em;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
hr { border: 0; border-top: var(--border-width) solid var(--color-border); margin: 0; }
a { color: inherit; text-decoration: none; }
::selection { background-color: var(--color-primary-soft); color: var(--color-text-primary); }

/* Layout */
.container { width: 100%; max-width: var(--container-max); margin-inline: auto; padding-inline: var(--container-pad); }
.stack { display: flex; flex-direction: column; gap: var(--space-4); }
.row { display: flex; align-items: center; gap: var(--space-3); }
.row-between { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-4); }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-4); }
.grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--space-4); }
@media (max-width: 900px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

/* Nav */
.page-nav {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(12px);
  background-color: rgba(10, 11, 15, 0.80);
  border-bottom: 1px solid var(--color-border);
}
.page-nav .container { height: 64px; display: flex; align-items: center; justify-content: space-between; }
.nav-left { display: inline-flex; align-items: center; gap: var(--space-8); }
.brand-row { display: inline-flex; align-items: center; gap: 10px; }
.brand-mark {
  width: 26px; height: 26px; border-radius: 7px;
  background: conic-gradient(from 200deg at 50% 50%, #E2641C, #1E2029 35%, #1E2029 65%, #E2641C);
  border: 1px solid var(--color-border-strong);
}
.brand-name { font-family: var(--font-display); font-weight: 700; letter-spacing: -0.02em; color: var(--color-text-primary); font-size: 1rem; }
.brand-suffix { color: var(--color-text-muted); font-weight: 500; }
.nav-items { display: inline-flex; align-items: center; gap: var(--space-6); }
.nav-items a { font-family: var(--font-display); font-size: 0.875rem; color: var(--color-text-secondary); transition: color var(--motion-base) var(--easing-standard); }
.nav-items a:hover, .nav-items a.active { color: var(--color-text-primary); }
.nav-right { display: inline-flex; align-items: center; gap: var(--space-3); }

/* Buttons */
.btn {
  appearance: none; display: inline-flex; align-items: center; justify-content: center;
  gap: var(--space-2); height: 40px; padding-inline: 18px;
  border-radius: var(--radius-md); border: 1px solid transparent;
  font-family: var(--font-display); font-size: 0.875rem; font-weight: 500;
  letter-spacing: -0.005em; line-height: 1; cursor: pointer; white-space: nowrap;
  background: transparent; color: var(--color-text-primary);
  transition: background-color var(--motion-base) var(--easing-standard),
    border-color var(--motion-base) var(--easing-standard),
    box-shadow var(--motion-base) var(--easing-standard);
}
.btn:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.btn:disabled { opacity: 0.4; pointer-events: none; }
.btn svg, .btn i { width: 16px; height: 16px; flex-shrink: 0; stroke-width: 1.75; }
.btn-sm { height: 32px; padding-inline: 12px; font-size: 0.8125rem; border-radius: 8px; }
.btn-sm svg, .btn-sm i { width: 14px; height: 14px; }
.btn-primary { background-color: var(--color-primary); color: #fff; border-color: var(--color-primary); box-shadow: inset 0 1px 0 rgba(255,255,255,0.18); }
.btn-primary:hover { background-color: var(--color-primary-hover); border-color: var(--color-primary-hover); }
.btn-secondary { background-color: var(--color-surface); color: var(--color-text-primary); border-color: var(--color-border-strong); }
.btn-secondary:hover { background-color: var(--color-elevated); }
.btn-tertiary { background: transparent; color: var(--color-text-secondary); }
.btn-tertiary:hover { background-color: var(--color-surface); color: var(--color-text-primary); }
.btn-icon { padding-inline: 0; width: 40px; }
.btn-icon.btn-sm { width: 32px; }

/* Inputs */
.input, .select {
  appearance: none; width: 100%; height: 40px;
  background-color: var(--color-surface); color: var(--color-text-primary);
  border: 1px solid var(--color-border); border-radius: var(--radius-md);
  padding-inline: 14px;
  font-family: var(--font-body); font-size: 0.9375rem; letter-spacing: -0.005em;
  transition: border-color var(--motion-base) var(--easing-standard), box-shadow var(--motion-base) var(--easing-standard);
}
.input::placeholder { color: var(--color-text-muted); }
.input:focus, .select:focus { outline: none; border-color: var(--color-primary); box-shadow: var(--focus-ring); }
.input-group { position: relative; display: flex; align-items: center; }
.input-group .input { padding-left: 38px; }
.input-group .input-icon { position: absolute; left: 12px; width: 16px; height: 16px; color: var(--color-text-muted); pointer-events: none; display: flex; align-items: center; }
.select {
  background-image: linear-gradient(45deg, transparent 50%, var(--color-text-secondary) 50%), linear-gradient(135deg, var(--color-text-secondary) 50%, transparent 50%);
  background-position: calc(100% - 16px) 50%, calc(100% - 11px) 50%;
  background-size: 5px 5px, 5px 5px; background-repeat: no-repeat; padding-right: 36px; cursor: pointer;
}

/* Cards */
.card {
  background-color: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: var(--space-6);
  display: flex; flex-direction: column; gap: var(--space-4);
  transition: border-color var(--motion-base) var(--easing-standard);
}
.card:hover { border-color: var(--color-border-strong); }
.card-elevated { background-color: var(--color-elevated); border-color: var(--color-border-strong); box-shadow: var(--shadow-md); }

/* Tabs */
.tabs { display: inline-flex; align-items: center; gap: 4px; padding: 4px; background-color: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-full); }
.tab {
  appearance: none; background: transparent; border: 1px solid transparent; border-radius: var(--radius-full);
  color: var(--color-text-secondary); font-family: var(--font-display); font-size: 0.8125rem; font-weight: 500;
  height: 32px; padding-inline: 14px; cursor: pointer;
  transition: background-color var(--motion-base) var(--easing-standard), color var(--motion-base) var(--easing-standard), border-color var(--motion-base) var(--easing-standard);
  display: inline-flex; align-items: center; gap: var(--space-2);
}
.tab:hover { background-color: var(--color-elevated); color: var(--color-text-primary); }
.tab.is-active { background-color: var(--color-elevated); color: var(--color-text-primary); border-color: var(--color-primary); }

/* Chips */
.chip {
  display: inline-flex; align-items: center; gap: var(--space-1);
  height: 24px; padding-inline: 10px; border-radius: var(--radius-full);
  background-color: var(--color-primary-soft); color: var(--color-primary-hover);
  font-family: var(--font-mono); font-size: 0.75rem; font-weight: 500; white-space: nowrap;
  border: 1px solid transparent;
}
.chip svg, .chip i { width: 12px; height: 12px; flex-shrink: 0; }
.chip[data-tone="success"] { background-color: var(--color-success-soft); color: var(--color-success); }
.chip[data-tone="warning"] { background-color: var(--color-warning-soft); color: var(--color-warning); }
.chip[data-tone="info"] { background-color: var(--color-info-soft); color: var(--color-info); }
.chip[data-tone="danger"] { background-color: var(--color-danger-soft); color: var(--color-danger); }
.chip[data-tone="high"] { background-color: var(--color-high-soft); color: var(--color-high); }
.chip[data-tone="neutral"] { background-color: var(--color-elevated); color: var(--color-text-secondary); border-color: var(--color-border); }
.chip[data-tone="critical"] { background-color: var(--color-danger-soft); color: var(--color-danger); }
.chip[data-tone="medium"] { background-color: var(--color-warning-soft); color: var(--color-warning); }
.chip[data-tone="low"] { background-color: var(--color-success-soft); color: var(--color-success); }

/* Badge dot */
.badge-dot { display: inline-block; width: 8px; height: 8px; border-radius: var(--radius-full); background-color: var(--color-primary); }
.badge-dot[data-tone="success"] { background-color: var(--color-success); }
.badge-dot[data-tone="warning"] { background-color: var(--color-warning); }
.badge-dot[data-tone="danger"] { background-color: var(--color-danger); }
.badge-dot[data-tone="high"] { background-color: var(--color-high); }
.badge-dot[data-tone="neutral"] { background-color: var(--color-text-muted); }

/* Stat Tile */
.stat-tile {
  position: relative; background-color: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: var(--space-5);
  display: flex; flex-direction: column; gap: var(--space-4); overflow: hidden;
  transition: border-color var(--motion-base) var(--easing-standard), transform var(--motion-base) var(--easing-standard);
}
.stat-tile::before {
  content: ""; position: absolute; inset: 0 0 auto 0;
  height: 2px; background-color: var(--color-primary); opacity: 0.9;
}
.stat-tile:hover { border-color: var(--color-border-strong); }
.stat-tile[data-tone="success"]::before { background-color: var(--color-success); }
.stat-tile[data-tone="warning"]::before { background-color: var(--color-warning); }
.stat-tile[data-tone="info"]::before { background-color: var(--color-info); }
.stat-tile[data-tone="danger"]::before { background-color: var(--color-danger); }
.stat-tile[data-tone="high"]::before { background-color: var(--color-high); }
.stat-tile[data-tone="critical"]::before { background-color: var(--color-danger); }
.stat-tile[data-tone="medium"]::before { background-color: var(--color-warning); }
.stat-tile[data-tone="low"]::before { background-color: var(--color-success); }
.stat-tile .stat-head { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); }
.stat-tile .stat-eyebrow { font-family: var(--font-display); font-size: 0.6875rem; font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; color: var(--color-text-secondary); }
.stat-tile .stat-value { font-family: var(--font-mono); font-weight: 600; font-size: 2.25rem; letter-spacing: -0.02em; line-height: 1; color: var(--color-text-primary); font-variant-numeric: tabular-nums; }
.stat-tile .stat-meta { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); }
.stat-tile .stat-foot { font-family: var(--font-body); font-size: 0.8125rem; color: var(--color-text-muted); }
.stat-tile .stat-spark { width: 96px; height: 32px; color: var(--color-primary); }
.stat-tile[data-tone="success"] .stat-spark { color: var(--color-success); }
.stat-tile[data-tone="warning"] .stat-spark, .stat-tile[data-tone="medium"] .stat-spark { color: var(--color-warning); }
.stat-tile[data-tone="info"] .stat-spark { color: var(--color-info); }
.stat-tile[data-tone="danger"] .stat-spark, .stat-tile[data-tone="critical"] .stat-spark { color: var(--color-danger); }
.stat-tile[data-tone="high"] .stat-spark { color: var(--color-high); }
.stat-tile[data-tone="low"] .stat-spark { color: var(--color-success); }

/* Table */
.data-table { width: 100%; border-collapse: collapse; }
.data-table th {
  text-align: left; padding: var(--space-3) var(--space-4);
  font-family: var(--font-display); font-size: 0.6875rem; font-weight: 500;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border); white-space: nowrap;
}
.data-table td {
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-body); font-size: 0.875rem; color: var(--color-text-primary);
  border-bottom: 1px solid var(--color-border);
  vertical-align: middle;
}
.data-table tr:last-child td { border-bottom: 0; }
.data-table tr:hover td { background-color: rgba(255,255,255,0.02); }
.data-table td.mono { font-family: var(--font-mono); font-size: 0.8125rem; color: var(--color-text-secondary); }
.data-table td.muted { color: var(--color-text-muted); font-size: 0.8125rem; }

/* Risk badge */
.risk-badge {
  display: inline-flex; align-items: center; gap: 5px;
  height: 22px; padding-inline: 8px; border-radius: var(--radius-full);
  font-family: var(--font-mono); font-size: 0.6875rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.04em;
}
.risk-badge[data-level="critical"] { background-color: var(--color-danger-soft); color: var(--color-danger); }
.risk-badge[data-level="high"] { background-color: var(--color-high-soft); color: var(--color-high); }
.risk-badge[data-level="medium"] { background-color: var(--color-warning-soft); color: var(--color-warning); }
.risk-badge[data-level="low"] { background-color: var(--color-success-soft); color: var(--color-success); }
.risk-badge[data-level="none"], .risk-badge:not([data-level]) { background-color: var(--color-elevated); color: var(--color-text-muted); }

/* Status badge */
.status-badge {
  display: inline-flex; align-items: center; gap: 5px;
  height: 22px; padding-inline: 8px; border-radius: var(--radius-full);
  font-family: var(--font-mono); font-size: 0.6875rem; font-weight: 500;
}
.status-badge[data-status="complete"] { background-color: var(--color-success-soft); color: var(--color-success); }
.status-badge[data-status="pending"] { background-color: var(--color-elevated); color: var(--color-text-muted); border: 1px solid var(--color-border); }
.status-badge[data-status="processing"] { background-color: var(--color-info-soft); color: var(--color-info); }
.status-badge[data-status="error"] { background-color: var(--color-danger-soft); color: var(--color-danger); }

/* Section header */
.section-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--space-4); gap: var(--space-4); }
.section-title { font-family: var(--font-display); font-size: 1rem; font-weight: 600; letter-spacing: -0.01em; color: var(--color-text-primary); margin: 0; }
.eyebrow { font-family: var(--font-display); font-size: 0.6875rem; font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; color: var(--color-text-secondary); }

/* Skeleton loader */
.skeleton { background: linear-gradient(90deg, var(--color-elevated) 25%, var(--color-border-strong) 50%, var(--color-elevated) 75%); background-size: 400% 100%; animation: shimmer 1.4s ease infinite; border-radius: var(--radius-sm); }
@keyframes shimmer { 0% { background-position: 100% 0; } 100% { background-position: -100% 0; } }

/* Empty state */
.empty-state { display: flex; flex-direction: column; align-items: center; justify-content: center; padding: var(--space-16) var(--space-6); gap: var(--space-3); text-align: center; }
.empty-state i { width: 40px; height: 40px; color: var(--color-text-muted); }
.empty-state p { color: var(--color-text-muted); font-size: 0.9375rem; margin: 0; max-width: 36ch; }

/* Page layout */
.page-body { padding: var(--space-8) 0 var(--space-16); display: flex; flex-direction: column; gap: var(--space-8); }
.page-header { display: flex; align-items: flex-end; justify-content: space-between; gap: var(--space-4); flex-wrap: wrap; }
.page-title { font-family: var(--font-display); font-size: 2rem; font-weight: 700; letter-spacing: -0.03em; color: var(--color-text-primary); margin: 0 0 4px; }
.page-subtitle { font-family: var(--font-body); font-size: 0.9375rem; color: var(--color-text-secondary); margin: 0; }

/* Footer */
.page-footer { border-top: 1px solid var(--color-border); padding: var(--space-6) 0; }
.page-footer .container { display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); }
.footer-brand { display: inline-flex; align-items: center; gap: var(--space-2); font-family: var(--font-mono); font-size: 0.75rem; color: var(--color-text-muted); }
.footer-links { display: inline-flex; gap: var(--space-6); }
.footer-links a { font-family: var(--font-display); font-size: 0.8125rem; color: var(--color-text-secondary); }
.footer-links a:hover { color: var(--color-text-primary); }

/* Utility */
.divider { height: 1px; background: var(--color-border); border: 0; width: 100%; }
.text-muted { color: var(--color-text-muted); }
.text-secondary { color: var(--color-text-secondary); }
.font-mono { font-family: var(--font-mono); }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.001ms !important; animation-duration: 0.001ms !important; }
}