/* ── dw-aware shared design system ─────────────────────────────────── */

/* ── Color tokens ─────────────────────────────────────────────────── */
:root {
  --bg:          #f9fafb;
  --bg-surface:  #ffffff;
  --bg-muted:    #f3f4f6;
  --border:      #e5e7eb;
  --border-input:#d1d5db;
  --text:        #1f2937;
  --text-muted:  #6b7280;
  --text-sub:    #374151;
  --primary:     #2563eb;
  --primary-fg:  #ffffff;
  --success:     #047857;
  --warn:        #b45309;
  --err:         #b91c1c;

  /* pill variants */
  --pill-confirmed-bg:     #d1fae5; --pill-confirmed-fg:     #065f46;
  --pill-autocorrected-bg: #fef3c7; --pill-autocorrected-fg: #92400e;
  --pill-flagged-bg:       #fee2e2; --pill-flagged-fg:       #991b1b;
  --pill-unverifiable-bg:  #e0e7ff; --pill-unverifiable-fg:  #3730a3;
  --pill-unchecked-bg:     #f3f4f6; --pill-unchecked-fg:     #4b5563;

  /* segment cards */
  --seg-present-bg:     #eff6ff;
  --seg-present-border: #93c5fd;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:          #111827;
    --bg-surface:  #1f2937;
    --bg-muted:    #374151;
    --border:      #374151;
    --border-input:#4b5563;
    --text:        #f9fafb;
    --text-muted:  #9ca3af;
    --text-sub:    #d1d5db;
    --primary:     #3b82f6;
    --primary-fg:  #ffffff;
    --success:     #34d399;
    --warn:        #fbbf24;
    --err:         #f87171;

    --pill-confirmed-bg:     #064e3b; --pill-confirmed-fg:     #a7f3d0;
    --pill-autocorrected-bg: #78350f; --pill-autocorrected-fg: #fde68a;
    --pill-flagged-bg:       #7f1d1d; --pill-flagged-fg:       #fca5a5;
    --pill-unverifiable-bg:  #1e1b4b; --pill-unverifiable-fg:  #a5b4fc;
    --pill-unchecked-bg:     #374151; --pill-unchecked-fg:     #d1d5db;

    --seg-present-bg:     #1e3a5f;
    --seg-present-border: #3b82f6;
  }
}

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

/* ── Base ──────────────────────────────────────────────────────────── */
body {
  font-family: ui-sans-serif, system-ui, sans-serif;
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

/* ── Page shells ───────────────────────────────────────────────────── */

/* index.html — full-height shell with header + footer */
body.shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* tool pages — centered content column */
body.tool {
  max-width: 1080px;
  margin: 2rem auto;
  padding: 0 1rem;
}

/* ── Header / footer (shell layout) ───────────────────────────────── */
header {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  padding: 1.25rem 2rem;
}
header h1 { margin: 0; font-size: 1.35rem; letter-spacing: -0.01em; }
header .tagline { margin: 0.2rem 0 0; font-size: 0.88rem; color: var(--text-muted); }

footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ── Index hero + cards ────────────────────────────────────────────── */
main {
  flex: 1;
  max-width: 900px;
  width: 100%;
  margin: 3rem auto;
  padding: 0 1.5rem;
}
.hero { margin-bottom: 2.5rem; }
.hero h2 { font-size: 1.75rem; margin: 0 0 0.5rem; }
.hero p { color: var(--text-sub); margin: 0; font-size: 1rem; line-height: 1.6; max-width: 560px; }

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem 1.75rem;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: box-shadow 0.15s, border-color 0.15s;
}
.card:hover { box-shadow: 0 4px 16px rgba(0,0,0,0.12); border-color: var(--primary); }
.card-icon { font-size: 2rem; line-height: 1; margin-bottom: 0.25rem; }
.card h3 { margin: 0; font-size: 1.1rem; }
.card p { margin: 0; font-size: 0.88rem; color: var(--text-muted); line-height: 1.55; }
.card-cta { margin-top: auto; padding-top: 0.75rem; font-size: 0.85rem; font-weight: 600; color: var(--primary); }

/* ── Typography ────────────────────────────────────────────────────── */
h1 { margin: 0 0 0.25rem; font-size: 1.5rem; }
.sub { color: var(--text-muted); margin-bottom: 1.5rem; }

/* ── Form chrome ───────────────────────────────────────────────────── */
fieldset {
  border: 1px solid var(--border-input);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
}
legend { font-weight: 600; padding: 0 0.4rem; color: var(--text); }

label { display: block; font-size: 0.85rem; color: var(--text-sub); margin-bottom: 0.25rem; }

input[type=text],
input[type=number],
input[type=password] {
  width: 240px;
  padding: 0.4rem 0.5rem;
  border: 1px solid var(--border-input);
  border-radius: 4px;
  font: inherit;
  background: var(--bg-surface);
  color: var(--text);
}
input[type=file] { font: inherit; color: var(--text); }

select {
  font: inherit;
  padding: 0.4rem 0.5rem;
  border: 1px solid var(--border-input);
  border-radius: 4px;
  background: var(--bg-surface);
  color: var(--text);
}

/* ── Buttons ───────────────────────────────────────────────────────── */
button {
  background: var(--primary);
  color: var(--primary-fg);
  border: 0;
  border-radius: 4px;
  padding: 0.55rem 1.1rem;
  font: inherit;
  cursor: pointer;
}
button:hover:not(:disabled) { filter: brightness(1.1); }
button.secondary { background: var(--text-muted); }
button.success   { background: var(--success); }
button:disabled  { background: var(--border-input); color: var(--text-muted); cursor: not-allowed; }

/* ── Layout helpers ────────────────────────────────────────────────── */
.row { display: flex; gap: 1rem; flex-wrap: wrap; align-items: end; }

/* ── Status line ───────────────────────────────────────────────────── */
.status      { font-size: 0.9rem; color: var(--text); }
.status.ok   { color: var(--success); }
.status.warn { color: var(--warn); }
.status.err  { color: var(--err); }

/* ── Tables ────────────────────────────────────────────────────────── */
table { border-collapse: collapse; width: 100%; margin-top: 0.5rem; font-size: 0.92rem; }
th, td { border-bottom: 1px solid var(--border); padding: 0.45rem 0.6rem; text-align: left; vertical-align: top; }
th { background: var(--bg-muted); }

/* ── Inline code ───────────────────────────────────────────────────── */
code { background: var(--bg-muted); padding: 0.1rem 0.3rem; border-radius: 3px; font-size: 0.85em; }

/* ── Score bar ─────────────────────────────────────────────────────── */
.bar { display: inline-block; height: 8px; background: var(--primary); border-radius: 2px; vertical-align: middle; }

/* ── Tabs ──────────────────────────────────────────────────────────── */
.tab-bar { margin-bottom: 1rem; }

.tab-btn {
  background: var(--bg-muted);
  color: var(--text-sub);
  border: 1px solid var(--border-input);
  border-radius: 4px;
  padding: 0.4rem 1rem;
  font: inherit;
  cursor: pointer;
  margin-right: 0.4rem;
}
.tab-btn.tab-active { background: var(--primary); color: #fff; border-color: var(--primary); }
.tab-panel { display: none; }
.tab-panel.tab-panel-active { display: block; }

/* ── Pills ─────────────────────────────────────────────────────────── */
.pill { display: inline-block; padding: 0.1rem 0.55rem; border-radius: 999px; font-size: 0.78rem; font-weight: 600; }
.pill.confirmed        { background: var(--pill-confirmed-bg);     color: var(--pill-confirmed-fg); }
.pill.autocorrected    { background: var(--pill-autocorrected-bg); color: var(--pill-autocorrected-fg); }
.pill.flaggedforreview { background: var(--pill-flagged-bg);       color: var(--pill-flagged-fg); }
.pill.unverifiable     { background: var(--pill-unverifiable-bg);  color: var(--pill-unverifiable-fg); }
.pill.unchecked        { background: var(--pill-unchecked-bg);     color: var(--pill-unchecked-fg); }

/* ── Summary grid (packet validator) ──────────────────────────────── */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.75rem;
  margin-top: 0.5rem;
}
.summary-cell { background: var(--bg); border: 1px solid var(--border); border-radius: 6px; padding: 0.55rem 0.75rem; }
.summary-cell .num { font-size: 1.4rem; font-weight: 700; color: var(--text); }
.summary-cell .lbl { font-size: 0.78rem; color: var(--text-muted); }

/* ── Changelog / monospace box ─────────────────────────────────────── */
.changelog {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.75rem 1rem;
  font-family: ui-monospace, monospace;
  font-size: 0.85rem;
  white-space: pre-wrap;
  color: var(--text);
}

/* ── Download area ─────────────────────────────────────────────────── */
.download-area { display: flex; gap: 0.75rem; align-items: center; flex-wrap: wrap; }

/* ── Segment cards (slap detect) ───────────────────────────────────── */
.seg-card { border: 1px solid var(--border-input); border-radius: 6px; padding: 0.75rem 1rem; margin-bottom: 0.5rem; background: var(--bg-surface); }
.seg-card.absent  { background: var(--bg); color: var(--text-muted); }
.seg-card.present { background: var(--seg-present-bg); border-color: var(--seg-present-border); }
.seg-row { display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap; }

/* ── Canvas overlay (slap visualizer) ─────────────────────────────── */
.canvas-wrap    { position: relative; display: inline-block; }
.overlay-canvas { position: absolute; top: 0; left: 0; pointer-events: none; }