/* ============================================================
   Word Counter — vanilla CSS, derived from .aidesigner/mcp-latest.html.
   Light by default; dark via prefers-color-scheme.
   ============================================================ */

:root {
  --bg:           #ffffff;
  --bg-muted:     #fafafa;
  --bg-subtle:    #f4f4f5;
  --surface:      #ffffff;
  --border:       #e4e4e7;
  --border-soft:  #f4f4f5;
  --fg:           #18181b;
  --fg-muted:     #52525b;
  --fg-subtle:    #a1a1aa;
  --accent:       #059669;     /* emerald-600 — used sparingly for trust/positive signals */
  --warn:         #d97706;     /* amber-600 */
  --danger:       #e11d48;     /* rose-600 */
  --radius:       6px;
  --radius-lg:    10px;
  --shadow:       0 1px 2px rgba(0,0,0,.04);
  --shadow-lg:    0 8px 30px rgba(0,0,0,.06);
  --font-sans:    -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-num:     'SF Mono', 'JetBrains Mono', Menlo, Consolas, monospace;
  --max-width:    1280px;
  --header-h:     52px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:          #0a0a0b;
    --bg-muted:    #0c0c0e;
    --bg-subtle:   #18181b;
    --surface:     #18181b;
    --border:      #27272a;
    --border-soft: #1f1f23;
    --fg:          #fafafa;
    --fg-muted:    #a1a1aa;
    --fg-subtle:   #71717a;
    --accent:      #10b981;
    --shadow:      0 1px 2px rgba(0,0,0,.3);
    --shadow-lg:   0 8px 30px rgba(0,0,0,.4);
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.tabular { font-variant-numeric: tabular-nums; }
button { font-family: inherit; cursor: pointer; }

/* Header */
.site-header {
  height: var(--header-h);
  border-bottom: 1px solid var(--border);
  background: var(--bg-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  position: sticky; top: 0; z-index: 10;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 13px; letter-spacing: .02em; text-transform: uppercase; color: var(--fg); text-decoration: none; }
.brand-mark { width: 22px; height: 22px; border-radius: 4px; background: var(--fg); color: var(--bg); display: grid; place-items: center; font-size: 13px; font-weight: 800; }
.trust-pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px;
  font-size: 11px; font-weight: 600; letter-spacing: .04em; text-transform: uppercase;
  color: var(--fg-muted);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 999px;
}
.trust-pill .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }

/* Main split */
.app {
  display: grid;
  grid-template-columns: 1fr;
  min-height: calc(100dvh - var(--header-h));
}
@media (min-width: 1024px) {
  .app { grid-template-columns: 62% 38%; }
}

.workspace { display: flex; flex-direction: column; border-right: 1px solid var(--border); background: var(--bg); }

/* Hero */
.hero { padding: 20px 24px 12px; border-bottom: 1px solid var(--border-soft); }
.hero h1 { font-size: 22px; font-weight: 600; letter-spacing: -.02em; margin: 0 0 4px; color: var(--fg); line-height: 1.2; }
.hero-sub { font-size: 13px; color: var(--fg-muted); margin: 0; line-height: 1.4; }
@media (min-width: 1024px) { .hero { padding: 24px 32px 14px; } .hero h1 { font-size: 26px; } }

/* KPI row */
.kpis { display: grid; grid-template-columns: repeat(5, 1fr); border-bottom: 1px solid var(--border); background: var(--bg-muted); }
.kpi { padding: 14px 16px; border-right: 1px solid var(--border-soft); display: flex; flex-direction: column; gap: 6px; }
.kpi:last-child { border-right: none; }
.kpi-label { font-size: 10px; font-weight: 600; letter-spacing: .12em; text-transform: uppercase; color: var(--fg-subtle); }
.kpi-value { font-size: 28px; font-weight: 500; letter-spacing: -.02em; line-height: 1; color: var(--fg); }
@media (max-width: 600px) {
  .kpi-value { font-size: 20px; }
  .kpi { padding: 10px 8px; }
  .kpi-label { font-size: 9px; }
}

/* Editor */
.editor { flex: 1; min-height: 40vh; position: relative; }
.editor textarea {
  width: 100%; height: 100%; min-height: 40vh;
  padding: 24px;
  border: 0; outline: 0; resize: none; background: transparent;
  font-family: var(--font-sans);
  font-size: 17px; line-height: 1.6; color: var(--fg);
}
.editor textarea::placeholder { color: var(--fg-subtle); }
@media (min-width: 1024px) {
  .editor textarea { padding: 32px; font-size: 18px; }
}

/* Floating actions */
.actions {
  position: absolute; right: 16px; bottom: 16px;
  display: inline-flex; gap: 4px;
  padding: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}
.action-btn {
  background: transparent; border: 0;
  font-size: 13px; font-weight: 500; color: var(--fg-muted);
  padding: 6px 12px; border-radius: var(--radius);
  display: inline-flex; align-items: center; gap: 6px;
}
.action-btn:hover { background: var(--bg-subtle); color: var(--fg); }
.action-btn.danger:hover { background: rgba(225,29,72,.08); color: var(--danger); }
.action-btn.is-success { color: var(--accent); }

/* Right panel */
.intel {
  background: var(--bg-muted);
  border-top: 1px solid var(--border);
  overflow-y: auto;
}
@media (min-width: 1024px) { .intel { border-top: 0; max-height: calc(100dvh - var(--header-h)); } }
.intel-inner { padding: 24px; max-width: 560px; margin: 0 auto; display: flex; flex-direction: column; gap: 36px; }
@media (min-width: 1024px) { .intel-inner { padding: 32px; } }

.panel + .panel { border-top: 1px solid var(--border-soft); padding-top: 36px; }
.panel-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.panel-title { font-size: 11px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; color: var(--fg); margin: 0; }
.panel-hint { font-size: 10px; font-weight: 500; letter-spacing: .08em; text-transform: uppercase; color: var(--fg-subtle); }

/* Time grid */
.time-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.time-block .time-value { font-size: 28px; font-weight: 500; letter-spacing: -.02em; color: var(--fg); font-variant-numeric: tabular-nums; }
.time-block .time-meta { font-size: 11px; color: var(--fg-subtle); margin-top: 6px; letter-spacing: .04em; text-transform: uppercase; }

.seg { display: inline-flex; padding: 2px; background: var(--bg-subtle); border: 1px solid var(--border-soft); border-radius: var(--radius); }
.seg button { background: transparent; border: 0; padding: 4px 8px; font-size: 10px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--fg-subtle); border-radius: 4px; }
.seg button[aria-pressed="true"] { background: var(--surface); color: var(--fg); box-shadow: var(--shadow); }

/* Readability */
.flesch { display: flex; align-items: flex-end; gap: 16px; }
.flesch-score { font-size: 56px; font-weight: 500; letter-spacing: -.04em; line-height: 1; font-variant-numeric: tabular-nums; }
.flesch-meta { display: flex; flex-direction: column; gap: 6px; padding-bottom: 6px; }
.flesch-label { font-size: 13px; font-weight: 600; color: var(--fg-muted); }
.flesch-bar { width: 140px; height: 4px; background: var(--bg-subtle); border-radius: 999px; overflow: hidden; }
.flesch-bar > span { display: block; height: 100%; width: 0%; background: var(--fg-subtle); transition: width .5s ease, background-color .3s; }
.flesch-bar.tier-easy > span     { background: var(--accent); }
.flesch-bar.tier-standard > span { background: var(--fg-muted); }
.flesch-bar.tier-hard > span     { background: var(--warn); }
.flesch-bar.tier-very-hard > span { background: var(--danger); }

/* Platform limits */
.limits { display: flex; flex-direction: column; gap: 14px; }
.limit-row { display: grid; grid-template-columns: 130px 1fr 64px; align-items: center; gap: 16px; }
.limit-label { font-size: 13px; font-weight: 500; color: var(--fg); }
.limit-track { height: 3px; background: var(--bg-subtle); border-radius: 999px; overflow: hidden; }
.limit-fill { height: 100%; width: 0%; background: var(--fg-subtle); transition: width .35s ease, background-color .2s; }
.limit-row.is-warn .limit-fill { background: var(--warn); }
.limit-row.is-over .limit-fill { background: var(--danger); width: 100% !important; }
.limit-value { font-family: var(--font-num); font-size: 13px; font-weight: 600; text-align: right; color: var(--fg-muted); }
.limit-row.is-warn .limit-value { color: var(--warn); }
.limit-row.is-over .limit-value { color: var(--danger); }
@media (max-width: 600px) {
  .limit-row { grid-template-columns: 1fr 64px; }
  .limit-track { grid-column: 1 / -1; order: 3; }
}

/* Keyword density */
.kw-empty { text-align: center; padding: 24px 0; font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--fg-subtle); }
.kw-list { display: flex; flex-direction: column; gap: 8px; }
.kw-row { display: grid; grid-template-columns: 1fr 2fr 48px; align-items: center; gap: 12px; font-size: 13px; }
.kw-word { font-weight: 500; color: var(--fg); text-transform: lowercase; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.kw-bar { height: 4px; background: var(--bg-subtle); border-radius: 999px; overflow: hidden; }
.kw-bar > span { display: block; height: 100%; background: var(--fg); transition: width .4s ease; }
.kw-count { font-family: var(--font-num); font-size: 12px; color: var(--fg-muted); text-align: right; }

/* SEO copy */
.copy-block { padding-top: 36px; border-top: 1px solid var(--border-soft); }
.copy-block h2 { font-size: 13px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; margin: 0 0 12px; color: var(--fg); }
.copy-block h3 { font-size: 14px; font-weight: 600; margin: 20px 0 6px; color: var(--fg); }
.copy-block p { font-size: 13px; color: var(--fg-muted); line-height: 1.65; margin: 0 0 12px; }

/* Footer */
.site-footer { padding: 24px; border-top: 1px solid var(--border); background: var(--bg-muted); font-size: 12px; color: var(--fg-subtle); display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; align-items: center; }
.site-footer a { color: var(--fg-muted); text-decoration: none; }
.site-footer a:hover { color: var(--fg); }

/* Compliance pages */
.doc { max-width: 720px; margin: 0 auto; padding: 48px 24px 80px; }
.doc h1 { font-size: 28px; font-weight: 600; letter-spacing: -.02em; margin: 0 0 8px; }
.doc .doc-meta { font-size: 12px; color: var(--fg-subtle); margin-bottom: 32px; }
.doc h2 { font-size: 18px; font-weight: 600; margin: 32px 0 8px; }
.doc p { color: var(--fg-muted); line-height: 1.65; }
.doc a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }

/* 404 */
.error-shell { display: grid; place-items: center; min-height: 60vh; padding: 24px; text-align: center; }
.error-shell h1 { font-size: 80px; font-weight: 500; margin: 0; letter-spacing: -.04em; }
.error-shell p { color: var(--fg-muted); margin: 8px 0 24px; }
.error-shell a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }