/* brickflow Design System v1
 * Spec: docs/superpowers/specs/2026-04-16-brickflow-design-system-design.md
 * Hosted: https://assets.brickflow.io/v1/brickflow.css
 *
 * Sections:
 *   TOKENS · BASE · TYPE · BUTTONS · BADGES · STATUS
 *   CARDS · HERO · KPI · PROGRESS · LOG · REVIEW
 *   INPUTS · EMPTY · LOADING · KEYFRAMES
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:opsz,wght@14..32,400;14..32,500;14..32,600;14..32,700;14..32,800&display=swap');

/* ─── TOKENS ──────────────────────────────────────────────────────── */

:root {
  /* Brand */
  --bf-accent:       #8B5CF6;
  --bf-accent-deep:  #7C3AED;
  --bf-accent-dim:   rgba(139,92,246,.12);
  --bf-accent-bdr:   rgba(139,92,246,.20);
  --bf-brand-start:  #8B5CF6;
  --bf-brand-end:    #F472B6;
  --bf-grad:         linear-gradient(135deg,#8B5CF6,#F472B6);

  /* Dark surfaces */
  --bf-bg:           #0A0A0A;
  --bf-surface:      #111111;
  --bf-surface-2:    #1A1A1A;
  --bf-border:       #1E1E1E;
  --bf-border-2:     #2A2A2A;

  /* Light surfaces */
  --bf-light:        #FAFAFA;
  --bf-light-bdr:    #E5E5E5;
  --bf-light-2:      #F5F5F5;

  /* Ink — dark */
  --bf-ink:          #EDEDED;
  --bf-ink-2:        #888888;
  --bf-muted:        #555555;

  /* Ink — light */
  --bf-ink-light:    #111111;
  --bf-ink-light-2:  #555555;
  --bf-ink-light-3:  #AAAAAA;

  /* Typography */
  --bf-font:         'Inter', system-ui, sans-serif;

  /* Radius */
  --bf-r-sm:   4px;
  --bf-r:      6px;
  --bf-r-md:   8px;
  --bf-r-lg:  12px;
  --bf-r-xl: 999px;

  /* Spacing (4px base) */
  --bf-sp-1:   4px;
  --bf-sp-2:   8px;
  --bf-sp-3:  12px;
  --bf-sp-4:  16px;
  --bf-sp-5:  20px;
  --bf-sp-6:  24px;
  --bf-sp-8:  32px;
  --bf-sp-10: 40px;
  --bf-sp-12: 48px;

  /* Motion */
  --bf-dur-fast:  100ms;
  --bf-dur-base:  150ms;
  --bf-dur-slow:  250ms;
  --bf-ease:      ease-out;

  /* Semantic — success */
  --bf-success:      #22C55E;
  --bf-success-dim:  rgba(34,197,94,.08);
  --bf-success-bdr:  rgba(34,197,94,.20);

  /* Semantic — warning */
  --bf-warn:         #F59E0B;
  --bf-warn-dim:     rgba(245,158,11,.08);
  --bf-warn-bdr:     rgba(245,158,11,.20);

  /* Semantic — danger */
  --bf-danger:       #EF4444;
  --bf-danger-dim:   rgba(239,68,68,.08);
  --bf-danger-bdr:   rgba(239,68,68,.20);
}

/* ─── BASE ────────────────────────────────────────────────────────── */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

.bf-root {
  font-family: var(--bf-font);
  background: var(--bf-bg);
  color: var(--bf-ink);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ─── TYPE ────────────────────────────────────────────────────────── */

.bf-t-display {
  font-family: var(--bf-font);
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -.04em;
  line-height: 1.1;
}
.bf-t-title {
  font-family: var(--bf-font);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -.03em;
  line-height: 1.2;
}
.bf-t-heading {
  font-family: var(--bf-font);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -.01em;
  line-height: 1.3;
}
.bf-t-body {
  font-family: var(--bf-font);
  font-size: 13px;
  font-weight: 400;
  line-height: 1.6;
}
.bf-t-small {
  font-family: var(--bf-font);
  font-size: 11px;
  font-weight: 500;
  line-height: 1.5;
}
.bf-t-mono {
  font-family: 'Courier New', Courier, monospace;
  font-size: 11px;
  font-weight: 400;
}
/* Muted sentence case — no uppercase, no tracking (spec §4b) */
.bf-t-label {
  font-family: var(--bf-font);
  font-size: 10px;
  font-weight: 700;
  color: var(--bf-muted);
}

/* ─── BUTTONS ─────────────────────────────────────────────────────── */

.bf-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--bf-sp-2);
  padding: 7px 13px;
  border-radius: var(--bf-r);
  border: 1px solid transparent;
  font-family: var(--bf-font);
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  -webkit-font-smoothing: antialiased;
  transition:
    opacity      var(--bf-dur-base) var(--bf-ease),
    transform    var(--bf-dur-fast) var(--bf-ease),
    background   var(--bf-dur-base) var(--bf-ease),
    border-color var(--bf-dur-base) var(--bf-ease),
    box-shadow   var(--bf-dur-base) var(--bf-ease);
}
.bf-btn:hover  { opacity: .85; transform: translateY(-1px); }
.bf-btn:active { transform: translateY(0); }
.bf-btn:disabled,
.bf-btn[disabled] { opacity: .4; pointer-events: none; }

.bf-btn-primary {
  background: var(--bf-accent);
  color: #fff;
  border-color: transparent;
}
.bf-btn-primary:hover { background: var(--bf-accent-deep); }

.bf-btn-secondary {
  background: var(--bf-surface-2);
  color: var(--bf-ink-2);
  border-color: var(--bf-border-2);
}
.bf-btn-secondary:hover { border-color: var(--bf-muted); }

.bf-btn-ghost {
  background: transparent;
  color: var(--bf-muted);
  border-color: var(--bf-border);
}
.bf-btn-ghost:hover { border-color: var(--bf-border-2); color: var(--bf-ink-2); }

/* Gradient — import CTA only, never on standard buttons */
.bf-btn-import {
  background: var(--bf-grad);
  color: #fff;
  border-color: transparent;
}
.bf-btn-import:hover { opacity: .85; }

/* ─── BADGES & PILLS ──────────────────────────────────────────────── */

.bf-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 9px;
  border-radius: var(--bf-r);
  font-family: var(--bf-font);
  font-size: 11px;
  font-weight: 600;
  background: var(--bf-accent-dim);
  color: var(--bf-accent);
  border: 1px solid var(--bf-accent-bdr);
}
.bf-badge-success { background: var(--bf-success-dim); color: var(--bf-success); border-color: var(--bf-success-bdr); }
.bf-badge-warn    { background: var(--bf-warn-dim);    color: var(--bf-warn);    border-color: var(--bf-warn-bdr);    }
.bf-badge-danger  { background: var(--bf-danger-dim);  color: var(--bf-danger);  border-color: var(--bf-danger-bdr);  }
.bf-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 10px;
  border-radius: var(--bf-r-xl);
  font-family: var(--bf-font);
  font-size: 11px;
  font-weight: 600;
  background: var(--bf-surface-2);
  color: var(--bf-ink-2);
  border: 1px solid var(--bf-border-2);
}

/* Confidence pills — used in review rows and result tables */
.bf-conf-hi,
.bf-conf-md,
.bf-conf-lo,
.bf-conf-manual {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border-radius: var(--bf-r-xl);
  font-family: var(--bf-font);
  font-size: 10px;
  font-weight: 600;
  border: 1px solid;
}
.bf-conf-hi     { background: rgba(34,197,94,.10);  color: #4ade80; border-color: rgba(34,197,94,.20);  }
.bf-conf-md     { background: var(--bf-warn-dim);   color: var(--bf-warn); border-color: var(--bf-warn-bdr); }
.bf-conf-lo     { background: rgba(239,68,68,.10);  color: #f87171; border-color: rgba(239,68,68,.20);  }
.bf-conf-manual { background: var(--bf-surface-2);  color: var(--bf-muted); border-color: var(--bf-border-2); }

/* Extension chips — file type indicators (uppercase is correct here: abbreviations) */
.bf-ext-pill {
  display: inline-flex;
  align-items: center;
  padding: 2px 7px;
  border-radius: var(--bf-r-sm);
  font-family: var(--bf-font);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  background: var(--bf-surface-2);
  color: var(--bf-muted);
  border: 1px solid var(--bf-border-2);
}
.bf-ext-pill-pdf  { background: rgba(239,68,68,.08);  color: #f87171; border-color: rgba(239,68,68,.20);  }
.bf-ext-pill-docx { background: rgba(59,130,246,.08); color: #60a5fa; border-color: rgba(59,130,246,.20); }
.bf-ext-pill-xlsx { background: rgba(34,197,94,.08);  color: #4ade80; border-color: rgba(34,197,94,.20);  }

/* ─── STATUS BOXES ────────────────────────────────────────────────── */

.bf-status {
  display: flex;
  align-items: flex-start;
  gap: var(--bf-sp-3);
  padding: var(--bf-sp-4);
  border-radius: var(--bf-r-md);
  border: 1px solid;
  font-family: var(--bf-font);
  font-size: 13px;
  animation: bfSlideUp var(--bf-dur-slow) var(--bf-ease);
}
.bf-status-icon  { flex-shrink: 0; margin-top: 1px; }
.bf-status-title { font-weight: 600; margin-bottom: 2px; }
.bf-status-body  { font-size: 12px; opacity: .7; line-height: 1.5; }

.bf-status-loading {
  background: var(--bf-surface);
  border-color: var(--bf-border);
  color: var(--bf-ink-2);
}
.bf-status-success {
  background: var(--bf-success-dim);
  border-color: var(--bf-success-bdr);
  color: var(--bf-success);
}
.bf-status-review {
  background: var(--bf-accent-dim);
  border-color: var(--bf-accent-bdr);
  color: var(--bf-accent);
}
.bf-status-warn {
  background: var(--bf-warn-dim);
  border-color: var(--bf-warn-bdr);
  color: var(--bf-warn);
}
.bf-status-error {
  background: var(--bf-danger-dim);
  border-color: var(--bf-danger-bdr);
  color: var(--bf-danger);
}

/* ─── CARDS & SURFACES ────────────────────────────────────────────── */

/* Dark surface card — border only, no shadow (spec §4a) */
.bf-card {
  background: var(--bf-surface);
  border: 1px solid var(--bf-border);
  border-radius: var(--bf-r-md);
  padding: var(--bf-sp-4);
}

/* Light surface card — hairline border + minimal shadow (spec §4a) */
.bf-card-light {
  background: #fff;
  border: 1px solid #F0F0F0;
  border-radius: var(--bf-r-md);
  padding: var(--bf-sp-4);
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
}

/* Light surface elevated panel — stronger shadow for modals/popovers */
.bf-card-light-elevated {
  background: #fff;
  border: 1px solid #EBEBEB;
  border-radius: var(--bf-r-md);
  padding: var(--bf-sp-4);
  box-shadow: 0 2px 8px rgba(0,0,0,.08);
}

/* Panel — header + body chrome */
.bf-panel {
  background: var(--bf-surface);
  border: 1px solid var(--bf-border);
  border-radius: var(--bf-r-md);
  overflow: hidden;
}
.bf-panel-header {
  padding: var(--bf-sp-3) var(--bf-sp-4);
  border-bottom: 1px solid var(--bf-border);
  font-family: var(--bf-font);
  font-size: 12px;
  font-weight: 600;
  color: var(--bf-ink-2);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.bf-panel-body { padding: var(--bf-sp-4); }

/* ─── HERO ────────────────────────────────────────────────────────── */

.bf-hero {
  background: var(--bf-bg);
  position: relative;
  overflow: hidden;
  padding: var(--bf-sp-8) var(--bf-sp-8) var(--bf-sp-10);
}
/* Radial glow — decorative, pointer-events disabled */
.bf-hero::before {
  content: '';
  position: absolute;
  top: -120px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse at center, rgba(139,92,246,.18) 0%, transparent 70%);
  pointer-events: none;
}

/* Hero badge — animated pulse dot + label pill */
.bf-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--bf-sp-2);
  padding: 4px 12px;
  border-radius: var(--bf-r-xl);
  background: var(--bf-accent-dim);
  border: 1px solid var(--bf-accent-bdr);
  font-family: var(--bf-font);
  font-size: 11px;
  font-weight: 600;
  color: var(--bf-accent);
  margin-bottom: var(--bf-sp-4);
}
.bf-hero-badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--bf-accent);
  animation: bfPulse 2s ease-in-out infinite;
  flex-shrink: 0;
}

/* ─── KPI ─────────────────────────────────────────────────────────── */

.bf-kpi {
  background: var(--bf-surface);
  border: 1px solid var(--bf-border);
  border-radius: var(--bf-r-md);
  padding: var(--bf-sp-4);
}
/* Muted sentence case label — no uppercase (spec §4b) */
.bf-kpi-label {
  font-family: var(--bf-font);
  font-size: 10px;
  font-weight: 700;
  color: var(--bf-muted);
  margin-bottom: var(--bf-sp-2);
}
.bf-kpi-value {
  font-family: var(--bf-font);
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -.03em;
  color: var(--bf-ink);
  line-height: 1;
  margin-bottom: var(--bf-sp-1);
}
.bf-kpi-value-accent { color: var(--bf-accent); }
.bf-kpi-sub {
  font-family: var(--bf-font);
  font-size: 11px;
  color: var(--bf-muted);
}
.bf-kpi-delta {
  font-family: var(--bf-font);
  font-size: 11px;
  font-weight: 600;
}
.bf-kpi-delta-up   { color: var(--bf-success); }
.bf-kpi-delta-down { color: var(--bf-danger);  }

/* ─── PROGRESS ────────────────────────────────────────────────────── */

.bf-progress {
  height: 6px;
  background: var(--bf-surface-2);
  border-radius: var(--bf-r-xl);
  overflow: hidden;
}
.bf-progress-fill {
  height: 100%;
  background: var(--bf-grad);
  border-radius: var(--bf-r-xl);
  transition: width var(--bf-dur-slow) var(--bf-ease);
}

/* ─── LOG PANEL ───────────────────────────────────────────────────── */

.bf-log {
  background: var(--bf-bg);
  border: 1px solid var(--bf-border);
  border-radius: var(--bf-r-md);
  overflow: hidden;
}
.bf-log-header {
  padding: var(--bf-sp-2) var(--bf-sp-4);
  border-bottom: 1px solid var(--bf-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--bf-font);
  font-size: 11px;
  font-weight: 600;
  color: var(--bf-muted);
  cursor: pointer;
  background: var(--bf-surface);
  user-select: none;
}
.bf-log-body {
  max-height: 200px;
  overflow-y: auto;
}
.bf-log-row {
  display: grid;
  grid-template-columns: 80px 16px 1fr;
  gap: var(--bf-sp-2);
  padding: 4px var(--bf-sp-3);
  border-bottom: 1px solid #0F0F0F;
  align-items: start;
}
.bf-log-row:last-child { border-bottom: none; }
.bf-log-ts  { font-family: 'Courier New', Courier, monospace; font-size: 10px; color: var(--bf-muted); white-space: nowrap; padding-top: 1px; }
.bf-log-msg { font-family: 'Courier New', Courier, monospace; font-size: 11px; color: var(--bf-ink-2); word-break: break-word; line-height: 1.5; }

/* Icon colour utilities — used inside log rows */
.bf-ic-ok    { color: var(--bf-success); flex-shrink: 0; }
.bf-ic-info  { color: var(--bf-muted);   flex-shrink: 0; }
.bf-ic-warn  { color: var(--bf-warn);    flex-shrink: 0; }
.bf-ic-err   { color: var(--bf-danger);  flex-shrink: 0; }
/* Gradient text — brickflow brand icon in log */
.bf-ic-brand {
  background: var(--bf-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  flex-shrink: 0;
}

/* ─── REVIEW SECTION ──────────────────────────────────────────────── */

.bf-review-panel {
  background: var(--bf-surface);
  border: 1px solid var(--bf-border);
  border-radius: var(--bf-r-md);
  overflow: hidden;
}
.bf-review-header {
  padding: var(--bf-sp-3) var(--bf-sp-4);
  border-bottom: 1px solid var(--bf-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.bf-review-row {
  display: grid;
  grid-template-columns: 24px 1fr 1fr 70px;
  gap: var(--bf-sp-3);
  padding: var(--bf-sp-3) var(--bf-sp-4);
  border-bottom: 1px solid #0F0F0F;
  align-items: center;
  transition: background var(--bf-dur-fast) var(--bf-ease);
}
.bf-review-row:last-child { border-bottom: none; }
.bf-review-row:hover { background: var(--bf-surface-2); }
.bf-review-doc {
  font-family: var(--bf-font);
  font-size: 12px;
  font-weight: 500;
  color: var(--bf-ink-2);
}
.bf-review-asset {
  font-family: var(--bf-font);
  font-size: 12px;
  color: var(--bf-muted);
}
.bf-why-toggle {
  font-family: var(--bf-font);
  font-size: 10px;
  color: var(--bf-muted);
  cursor: pointer;
  padding: 0;
  background: none;
  border: none;
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--bf-dur-base) var(--bf-ease);
}
.bf-why-toggle:hover { color: var(--bf-ink-2); }
.bf-why-body {
  padding: var(--bf-sp-2) var(--bf-sp-4) var(--bf-sp-3);
  font-family: var(--bf-font);
  font-size: 11px;
  color: var(--bf-muted);
  background: var(--bf-bg);
  border-top: 1px solid var(--bf-border);
  line-height: 1.6;
}

/* ─── INPUTS ──────────────────────────────────────────────────────── */

.bf-input,
.bf-select {
  width: 100%;
  background: var(--bf-bg);
  color: var(--bf-ink);
  font-family: var(--bf-font);
  font-size: 13px;
  padding: 9px 12px;
  border-radius: var(--bf-r);
  border: 1px solid var(--bf-border);
  outline: none;
  appearance: none;
  -webkit-appearance: none;
  transition:
    border-color var(--bf-dur-base) var(--bf-ease),
    box-shadow   var(--bf-dur-base) var(--bf-ease);
}
.bf-input::placeholder,
.bf-select::placeholder { color: var(--bf-muted); }
.bf-input:hover,
.bf-select:hover { border-color: var(--bf-border-2); }

/* Focus: border + 15% glow (spec §4.9, option B) */
.bf-input:focus,
.bf-select:focus {
  border-color: var(--bf-accent);
  box-shadow: 0 0 0 3px var(--bf-accent-dim);
}

/* Error state */
.bf-input.is-error {
  border-color: var(--bf-danger);
  box-shadow: 0 0 0 3px rgba(239,68,68,.10);
}

/* Disabled */
.bf-input:disabled,
.bf-select:disabled {
  border-color: #141414;
  background: #080808;
  color: #333;
  cursor: not-allowed;
}

/* Read-only — lighter visual than disabled, still selectable */
.bf-input[readonly] {
  border-color: #141414;
  color: var(--bf-muted);
  cursor: default;
  background: var(--bf-bg);
}
.bf-input[readonly]:focus {
  border-color: #141414;
  box-shadow: none;
}

/* Form helpers */
.bf-field-label {
  display: block;
  font-family: var(--bf-font);
  font-size: 11px;
  font-weight: 600;
  color: var(--bf-muted);
  margin-bottom: 5px;
}
.bf-field-hint {
  font-family: var(--bf-font);
  font-size: 10px;
  color: var(--bf-muted);
  margin-top: 4px;
}
.bf-field-error {
  font-family: var(--bf-font);
  font-size: 10px;
  color: var(--bf-danger);
  margin-top: 4px;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ─── EMPTY STATES ────────────────────────────────────────────────── */

.bf-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 160px;
  padding: var(--bf-sp-6) var(--bf-sp-5);
}
.bf-empty-sm {
  min-height: 80px;
  padding: var(--bf-sp-4) var(--bf-sp-5);
}
.bf-empty-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--bf-r-md);
  background: #141414;
  border: 1px solid var(--bf-border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--bf-sp-3);
  color: var(--bf-muted);
  flex-shrink: 0;
}
.bf-empty-sm .bf-empty-icon {
  width: 28px;
  height: 28px;
  border-radius: var(--bf-r);
  margin-bottom: var(--bf-sp-2);
}
.bf-empty-title {
  font-family: var(--bf-font);
  font-size: 13px;
  font-weight: 600;
  color: var(--bf-muted);
  margin-bottom: 4px;
}
.bf-empty-sm .bf-empty-title { font-size: 12px; }
.bf-empty-desc {
  font-family: var(--bf-font);
  font-size: 11px;
  color: var(--bf-muted);
  line-height: 1.5;
  max-width: 220px;
}

/* ─── LOADING ─────────────────────────────────────────────────────── */

/* Skeleton — shimmer bars for content placeholder */
.bf-skel {
  background: linear-gradient(
    90deg,
    #141414 25%,
    #1E1E1E 50%,
    #141414 75%
  );
  background-size: 1600px 100%;
  animation: bfShimmer 1.4s ease-in-out infinite;
  border-radius: var(--bf-r-sm);
}
.bf-skel-line {
  height: 11px;
  margin-bottom: 6px;
}
/* Skeleton row — mirrors .bf-review-row layout */
.bf-skel-row {
  display: grid;
  grid-template-columns: 28px 1fr auto;
  gap: var(--bf-sp-3);
  align-items: center;
  padding: var(--bf-sp-3) 0;
  border-bottom: 1px solid #0F0F0F;
}
.bf-skel-row:last-child { border-bottom: none; }
/* Skeleton card wrapper */
.bf-skel-card {
  background: var(--bf-surface);
  border: 1px solid var(--bf-border);
  border-radius: var(--bf-r-md);
  padding: var(--bf-sp-4);
}

/* Spinner — for button loading states */
.bf-spinner {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid var(--bf-border);
  border-top-color: var(--bf-accent);
  animation: bfSpin .7s linear infinite;
  flex-shrink: 0;
}
.bf-spinner-sm {
  width: 14px;
  height: 14px;
  border-width: 1.5px;
}

/* ─── KEYFRAMES ───────────────────────────────────────────────────── */

@keyframes bfSlideUp {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes bfPulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: .4; }
}
@keyframes bfSpin {
  to { transform: rotate(360deg); }
}
@keyframes bfShimmer {
  0%   { background-position: -1600px 0; }
  100% { background-position:  1600px 0; }
}