/* ============================================================
   Shared tool design system
   ทำตาม docs/UX-UI-DESIGN-HANDOFF-20-TOOLS §7 (UX contract),
   §8 (UI direction / tokens), §11 (accessibility + responsive)

   ธีมเลือกด้วย <html data-brand="kanngongkanngoen"> หรือ "songtor"
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Barlow+Condensed:wght@500;600;700;800&family=IBM+Plex+Sans+Thai:wght@400;500;600;700&family=Inter:wght@400;500;600;700;800&family=Kanit:wght@500;600;700;800&family=Noto+Sans+Thai:wght@400;500;600;700;800&display=swap');

/* ---------- 1. Tokens ---------- */

:root {
  /* spacing scale 4/8/12/16/24/32/48 */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 24px;
  --sp-6: 32px;
  --sp-7: 48px;
  --sp-8: 72px;

  /* Blueprint skin: square corners across the schematic. Structural frames
     read as engineering plates; small indicators may re-round in §16. */
  --radius-control: 0px;
  --radius-panel: 0px;
  --radius-card: 0px;
  --radius-pill: 0px;

  --tool-max: 1140px;
  --tap-min: 46px;

  --font-heading: "Barlow Condensed", "Kanit", "Noto Sans Thai", system-ui, -apple-system, sans-serif;
  --font-th: "IBM Plex Sans Thai", "Inter", "Noto Sans Thai", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-num: "Barlow Condensed", "Inter", "SF Mono", ui-monospace, "IBM Plex Mono", "Roboto Mono", Menlo, monospace;
  /* Technical mono for kickers, codes, gauge labels (matches prototype). */
  --font-mono: ui-monospace, "SF Mono", "IBM Plex Mono", "Roboto Mono", Menlo, monospace;

  /* Blueprint tokens — all derived from --brand so each theme (kanngong
     emerald / songtor sapphire) recolors its grid + registration marks
     automatically. Defined once on :root; brand blocks only override color. */
  --bp-grid: color-mix(in srgb, var(--brand) 7%, transparent);
  --bp-corner: var(--brand);
  --bp-corner-size: 13px;
  --bp-corner-w: 1.5px;
  --bp-hair: var(--line-strong);

  /* neutral base — high contrast, rich modern palette */
  --ink: #0f172a;
  --ink-soft: #334155;
  --muted: #64748b;
  --line: #e2e8f0;
  --line-strong: #cbd5e1;
  --canvas: #f8faf9;
  --surface: #ffffff;
  --surface-sunk: #f1f5f3;

  --brand: #0e382f;
  --brand-strong: #07241e;
  --brand-ink: #ffffff;
  --brand-soft: #e6f4f0;
  --brand-line: #b3dfd4;
  --brand-gradient: linear-gradient(135deg, #0e382f 0%, #165649 100%);

  --warn-ink: #854d0e;
  --warn-bg: #fefce8;
  --warn-line: #fef08a;
  --danger-ink: #991b1b;
  --danger-bg: #fef2f2;
  --danger-line: #fecaca;
  --ok-ink: #065f46;
  --ok-bg: #ecfdf5;
  --ok-line: #a7f3d0;

  --focus: #10b981;
  --shadow-panel: 0 4px 20px -2px rgba(14, 56, 47, 0.08), 0 2px 6px -1px rgba(14, 56, 47, 0.04);
  --shadow-card: 0 4px 12px -1px rgba(15, 23, 42, 0.05), 0 1px 3px rgba(15, 23, 42, 0.03);
}

:root[data-brand="songtor"] {
  --ink: #0f172a;
  --ink-soft: #334155;
  --muted: #64748b;
  --line: #e2e8f0;
  --line-strong: #cbd5e1;
  --canvas: #f8fafc;
  --surface: #ffffff;
  --surface-sunk: #f1f5f9;

  --brand: #1e3a8a;
  --brand-strong: #1e293b;
  --brand-ink: #ffffff;
  --brand-soft: #eff6ff;
  --brand-line: #bfdbfe;
  --brand-gradient: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);

  --gold: #d97706;
  --gold-ink: #78350f;
  --gold-bg: #fffbeb;
  --gold-line: #fde68a;

  --warn-ink: #78350f;
  --warn-bg: #fffbeb;
  --warn-line: #fde68a;
  --ok-ink: #065f46;
  --focus: #2563eb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f8fafc;
    --ink-soft: #cbd5e1;
    --muted: #94a3b8;
    --line: #1e293b;
    --line-strong: #334155;
    --canvas: #090d12;
    --surface: #111827;
    --surface-sunk: #0f172a;

    --brand: #34d399;
    --brand-strong: #6ee7b7;
    --brand-ink: #022c22;
    --brand-soft: #064e3b;
    --brand-line: #047857;

    --warn-ink: #fde047;
    --warn-bg: #422006;
    --warn-line: #713f12;
    --danger-ink: #fca5a5;
    --danger-bg: #450a0a;
    --danger-line: #7f1d1d;
    --ok-ink: #6ee7b7;
    --ok-bg: #064e3b;
    --ok-line: #047857;

    --focus: #34d399;
    --shadow-panel: 0 4px 20px rgba(0, 0, 0, 0.5);
    --shadow-card: 0 2px 10px rgba(0, 0, 0, 0.4);
  }

  :root[data-brand="songtor"] {
    --ink: #f8fafc;
    --ink-soft: #cbd5e1;
    --muted: #94a3b8;
    --warn-ink: #fde047;
    --warn-bg: #422006;
    --warn-line: #713f12;
    --ok-ink: #6ee7b7;
    --canvas: #090d16;
    --surface: #111827;
    --surface-sunk: #0f172a;
    --line: #1e293b;
    --line-strong: #334155;
    --brand: #60a5fa;
    --brand-strong: #93c5fd;
    --brand-ink: #1e3a8a;
    --brand-soft: #172554;
    --brand-line: #1e40af;
    --gold: #fbbf24;
    --gold-ink: #fde047;
    --gold-bg: #422006;
    --gold-line: #713f12;
    --focus: #60a5fa;
  }
}

/* ---------- 2. Base ---------- */

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

html { -webkit-text-size-adjust: 100%; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font-th);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand); text-underline-offset: 4px; transition: color .15s ease; }
a:hover { color: var(--brand-strong); }

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  line-height: 1.25;
  letter-spacing: normal;
  text-wrap: balance;
  margin-top: 0;
  color: var(--ink);
}

:where(a, button, input, select, summary, [tabindex]):focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  border-radius: var(--radius-control);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}

.tool-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.tool-skip {
  position: absolute;
  left: var(--sp-4);
  top: -6rem;
  z-index: 10;
  background: var(--brand);
  color: var(--brand-ink);
  font-weight: 700;
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--radius-control);
  text-decoration: none;
}
.tool-skip:focus { top: var(--sp-3); }

/* ---------- 3. Page shell ---------- */

.tool-page {
  max-width: var(--tool-max);
  margin: 0 auto;
  padding: var(--sp-5) var(--sp-4) var(--sp-8);
}

.tool-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-5);
  padding: var(--sp-4) var(--sp-5);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-panel);
  box-shadow: var(--shadow-card);
  margin-bottom: var(--sp-5);
}

.tool-brand {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--brand);
  text-decoration: none;
}
.tool-brand:hover { color: var(--brand-strong); }

.tool-nav { display: flex; flex-wrap: wrap; gap: var(--sp-2); }
.tool-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 var(--sp-4);
  border-radius: var(--radius-pill);
  color: var(--ink-soft);
  font-size: .9rem;
  font-weight: 600;
  text-decoration: none;
  transition: background .15s ease, color .15s ease;
}
.tool-nav a:hover,
.tool-nav a:focus-visible { background: var(--brand-soft); color: var(--brand); }

.tool-breadcrumb {
  font-size: .85rem;
  color: var(--muted);
  margin: 0 0 var(--sp-4);
  font-weight: 500;
}
.tool-breadcrumb a { color: inherit; text-decoration: none; }
.tool-breadcrumb a:hover { color: var(--brand); text-decoration: underline; }

/* ---------- 4. Hero ---------- */

.tool-hero {
  max-width: 920px;
  margin-bottom: var(--sp-6);
}

.tool-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  margin: 0 0 var(--sp-3);
  padding: var(--sp-1) var(--sp-4);
  border: 1px solid var(--brand-line);
  border-radius: var(--radius-pill);
  background: var(--brand-soft);
  color: var(--brand);
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .02em;
}

.tool-page h1 {
  font-size: clamp(1.85rem, 1.2rem + 2.5vw, 2.75rem);
  font-weight: 800;
  margin: 0 0 var(--sp-3);
  color: var(--ink);
  line-height: 1.2;
}

.tool-lede {
  font-size: 1.1rem;
  color: var(--ink-soft);
  margin: 0;
  max-width: 68ch;
  line-height: 1.65;
  text-wrap: pretty;
}

/* ---------- 5. Tool grid + panels ---------- */

.tool-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--sp-5);
  align-items: start;
  margin-top: var(--sp-5);
}

.tool-grid--stacked {
  grid-template-columns: 1fr !important;
  gap: var(--sp-6);
}

@media (max-width: 840px) {
  .tool-grid { grid-template-columns: 1fr; }
}

.tool-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius-panel);
  background: var(--surface);
  padding: clamp(var(--sp-4), 3vw, var(--sp-6));
  box-shadow: var(--shadow-panel);
}

.tool-panel > h2 {
  font-size: 1.3rem;
  font-weight: 800;
  margin: 0 0 var(--sp-3);
  padding-bottom: var(--sp-2);
  border-bottom: 2px solid var(--brand-soft);
}

.tool-help,
.tool-note { font-size: .9rem; color: var(--muted); line-height: 1.6; }
.tool-help { margin: 0 0 var(--sp-4); }

/* ---------- 6. Form & Distinct Card Sessions ---------- */

.tool-form { display: grid; gap: var(--sp-5); }

.tool-form fieldset {
  border: 0;
  padding: 0;
  margin: 0;
}
.tool-form legend {
  padding: 0 var(--sp-2) 0 0;
  font-size: .95rem;
  font-weight: 800;
  color: var(--ink);
}

.tool-input-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--sp-4);
}

@media (max-width: 540px) {
  .tool-input-grid { grid-template-columns: 1fr; }
}

.tool-form label {
  display: grid;
  gap: var(--sp-1);
  font-size: .9rem;
  font-weight: 700;
  color: var(--ink-soft);
}

.tool-form input,
.tool-form select {
  width: 100%;
  min-height: var(--tap-min);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-control);
  padding: var(--sp-2) var(--sp-4);
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-weight: 600;
  font-size: .95rem;
  transition: border-color .15s ease, box-shadow .15s ease, background .15s ease;
}
.tool-form input[type="number"] { font-family: var(--font-num); font-variant-numeric: tabular-nums; }
.tool-form input:hover,
.tool-form select:hover { border-color: var(--brand); background: var(--surface-sunk); }
.tool-form input:focus,
.tool-form select:focus {
  border-color: var(--brand);
  background: var(--surface);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.18);
  outline: none;
}
.tool-form select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%204748b' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 36px; cursor: pointer; }

/* Distinct Form Sections (Session cards) */
.tool-form-section {
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--surface-sunk);
  padding: var(--sp-4) var(--sp-5);
  display: grid;
  gap: var(--sp-3);
  box-shadow: 0 1px 3px rgba(0,0,0,0.02);
}
.tool-form-section h3 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--brand);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}
.tool-form-help { margin: 0; color: var(--muted); font-size: .85rem; font-weight: 400; line-height: 1.5; }

.tool-goal-grid { display: grid; gap: var(--sp-3); }
.tool-goal-row {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) repeat(3, minmax(0, 1fr));
  gap: var(--sp-3);
  padding: var(--sp-4);
  border: 1px solid var(--line);
  border-radius: var(--radius-control);
  background: var(--surface);
}

@media (max-width: 640px) {
  .tool-goal-row { grid-template-columns: 1fr; }
}

.tool-check-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--sp-3); }
.tool-check-grid label {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-3);
  min-height: var(--tap-min);
  padding: var(--sp-3) var(--sp-4);
  border: 1px solid var(--line);
  border-radius: var(--radius-control);
  background: var(--surface);
  cursor: pointer;
  transition: border-color .15s ease, background .15s ease;
}
.tool-check-grid label:hover { border-color: var(--brand); background: var(--brand-soft); }
.tool-check-grid input[type="checkbox"] { width: 20px; height: 20px; margin-top: 2px; flex: none; accent-color: var(--brand); }

.tool-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  align-items: center;
  margin-top: var(--sp-2);
}

.tool-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  min-height: var(--tap-min);
  padding: var(--sp-3) var(--sp-6);
  border: 1px solid transparent;
  border-radius: var(--radius-control);
  background: var(--brand-gradient);
  color: var(--brand-ink);
  font: inherit;
  font-weight: 800;
  font-size: 1rem;
  text-decoration: none;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(14, 56, 47, 0.2);
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.tool-button:hover { background: var(--brand-strong); color: var(--brand-ink); transform: translateY(-1px); box-shadow: 0 6px 16px rgba(14, 56, 47, 0.28); }
.tool-button:active { transform: scale(0.98); }
.tool-button[disabled] { opacity: .55; cursor: progress; }

.tool-button--ghost {
  background: transparent;
  color: var(--brand);
  border: 1px solid var(--line-strong);
  box-shadow: none;
}
.tool-button--ghost:hover { background: var(--brand-soft); border-color: var(--brand); transform: translateY(-1px); }

.tool-button--block { width: 100%; }

.tool-errors {
  color: var(--danger-ink);
  background: var(--danger-bg);
  border: 1px solid var(--danger-line);
  border-radius: var(--radius-control);
  padding: var(--sp-3) var(--sp-4);
  font-size: .92rem;
  font-weight: 600;
}

/* ---------- 7. Result ---------- */

/* คำตอบหลักมาก่อนเสมอ (§7 result contract) */
.tool-answer {
  border: 1px solid var(--brand-line);
  border-radius: var(--radius-panel);
  background: var(--brand-gradient);
  color: var(--brand-ink);
  padding: var(--sp-5) var(--sp-6);
  margin-bottom: var(--sp-5);
  box-shadow: 0 8px 24px -4px rgba(14, 56, 47, 0.25);
  position: relative;
  overflow: hidden;
}
.tool-answer::after {
  content: "";
  position: absolute;
  top: -40%;
  right: -20%;
  width: 220px;
  height: 220px;
  background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, rgba(255,255,255,0) 70%);
  border-radius: 50%;
  pointer-events: none;
}
.tool-answer dt {
  margin: 0 0 var(--sp-2);
  font-size: .88rem;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.88);
  letter-spacing: .02em;
}
.tool-answer dd {
  margin: 0;
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.1rem, 1.4rem + 2.5vw, 3rem);
  font-weight: 800;
  line-height: 1.15;
  color: #ffffff;
  overflow-wrap: anywhere;
  text-shadow: 0 2px 4px rgba(0,0,0,0.15);
}
.tool-answer .tool-answer-unit {
  font-family: var(--font-th);
  font-size: 1.05rem;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.9);
  margin-left: var(--sp-2);
}

.tool-result-list { display: grid; gap: 0; margin: 0; }
.tool-result-list > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--sp-5);
  padding: var(--sp-3) var(--sp-2);
  border-bottom: 1px solid var(--line);
  transition: background .15s ease;
}
.tool-result-list > div:hover { background: var(--surface-sunk); border-radius: var(--radius-control); }
.tool-result-list > div:last-child { border-bottom: 0; }
.tool-result-list dt { color: var(--muted); font-size: .92rem; font-weight: 500; }
.tool-result-list dd {
  margin: 0;
  font-weight: 800;
  text-align: right;
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
  color: var(--ink);
}
.tool-result-section { margin-top: var(--sp-5); padding-top: var(--sp-4); border-top: 1px solid var(--line); }
.tool-result-section h3 { margin: 0 0 var(--sp-2); font-size: 1.05rem; font-weight: 800; color: var(--brand); }
.tool-result-section ul { margin: 0; padding-left: 1.25rem; color: var(--ink-soft); }
.tool-result-section li + li { margin-top: var(--sp-1); }
.tool-analysis-section { margin-top: var(--sp-5); padding-top: var(--sp-4); border-top: 1px solid var(--line); }
.tool-analysis-section h3 { margin: 0 0 var(--sp-3); font-size: 1.05rem; font-weight: 800; color: var(--brand); }
.tool-analysis-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 var(--sp-4); margin: 0; }
.tool-analysis-grid > div { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: var(--sp-3); padding: var(--sp-2) var(--sp-2); border-bottom: 1px solid var(--line); }
.tool-analysis-grid dt { color: var(--muted); font-size: .88rem; }
.tool-analysis-grid dd { margin: 0; text-align: right; font-weight: 800; font-variant-numeric: tabular-nums; color: var(--ink); }

/* empty / busy states (§7 state matrix) */
.tool-empty {
  display: grid;
  gap: var(--sp-2);
  padding: var(--sp-6) var(--sp-5);
  border: 2px dashed var(--line-strong);
  border-radius: var(--radius-panel);
  background: var(--surface-sunk);
  color: var(--muted);
  font-size: .95rem;
  text-align: center;
}
.tool-empty strong { color: var(--brand); font-size: 1.1rem; font-weight: 800; }

.tool-panel.is-busy { position: relative; }
.tool-panel.is-busy::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--surface);
  opacity: .55;
}

.tool-status { color: var(--muted); font-size: .9rem; }

/* ---------- 8. Chips / callouts ---------- */

.tool-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  padding: 4px var(--sp-3);
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-strong);
  background: var(--surface-sunk);
  color: var(--ink-soft);
  font-size: .8rem;
  font-weight: 700;
}
.tool-chip--verified { background: var(--ok-bg); border-color: var(--ok-line); color: var(--ok-ink); }
.tool-chip--verified::before { content: "✓"; }
.tool-chip--recent { background: var(--ok-bg); border-color: var(--ok-line); color: var(--ok-ink); }
.tool-chip--recent::before { content: "✓"; }
.tool-chip--stale { background: var(--warn-bg); border-color: var(--warn-line); color: var(--warn-ink); }
.tool-chip--stale::before { content: "!"; }
.tool-chip--dated { background: var(--warn-bg); border-color: var(--warn-line); color: var(--warn-ink); }
.tool-chip--dated::before { content: "!"; }
.tool-chip--needs_review,
.tool-chip--unknown { background: var(--warn-bg); border-color: var(--warn-line); color: var(--warn-ink); }
.tool-chip--needs_review::before,
.tool-chip--unknown::before { content: "?"; }
.tool-chip--closed { background: var(--danger-bg); border-color: var(--danger-line); color: var(--danger-ink); }
.tool-chip--closed::before { content: "×"; }
.tool-chip--unverified::before { content: "?"; }

.tool-callout {
  display: grid;
  gap: var(--sp-1);
  border: 1px solid var(--warn-line);
  border-left: 5px solid var(--warn-ink);
  border-radius: 0 var(--radius-card) var(--radius-card) 0;
  background: var(--warn-bg);
  color: var(--warn-ink);
  padding: var(--sp-4) var(--sp-5);
  margin-top: var(--sp-5);
  font-size: .93rem;
  box-shadow: var(--shadow-card);
}
.tool-callout strong { color: inherit; }

/* ---------- 9. Sections / FAQ / related ---------- */

.tool-section { margin-top: var(--sp-7); max-width: 100%; }
.tool-section > h2 { font-size: 1.4rem; font-weight: 800; margin: 0 0 var(--sp-4); color: var(--ink); border-bottom: 2px solid var(--line); padding-bottom: var(--sp-2); }
.tool-section > p { color: var(--ink-soft); margin: 0 0 var(--sp-3); max-width: 75ch; line-height: 1.7; font-size: 1.02rem; }

.tool-section > ul,
.tool-feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--sp-4);
  margin: var(--sp-4) 0 0;
  padding: 0;
  list-style: none;
}
.tool-section > ul > li,
.tool-feature-grid > li {
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--surface);
  padding: var(--sp-4) var(--sp-5);
  color: var(--ink-soft);
  font-size: .95rem;
  line-height: 1.65;
  display: flex;
  align-items: flex-start;
  gap: var(--sp-3);
  box-shadow: var(--shadow-card);
  transition: transform .15s ease, border-color .15s ease;
}
.tool-section > ul > li:hover,
.tool-feature-grid > li:hover {
  transform: translateY(-2px);
  border-color: var(--brand-line);
}
.tool-section > ul > li::before,
.tool-feature-grid > li::before {
  content: "✓";
  flex: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--brand-soft);
  color: var(--brand);
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: .85rem;
}

.tool-faq { max-width: 100%; }
.tool-faq details {
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--surface);
  padding: var(--sp-4) var(--sp-5);
  margin-top: var(--sp-3);
  box-shadow: var(--shadow-card);
  transition: border-color .15s ease;
}
.tool-faq details:hover { border-color: var(--brand-line); }
.tool-faq details[open] { background: var(--surface-sunk); }
.tool-faq summary {
  cursor: pointer;
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--ink);
  min-height: var(--tap-min);
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  list-style: none;
}
.tool-faq summary::-webkit-details-marker { display: none; }
.tool-faq summary::before {
  content: "+";
  flex: none;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border: 1.5px solid var(--brand);
  border-radius: 50%;
  font-weight: 800;
  color: var(--brand);
  font-size: .9rem;
}
.tool-faq details[open] summary::before { content: "–"; background: var(--brand); color: #fff; }
.tool-faq details p { color: var(--ink-soft); margin: var(--sp-3) 0 0 36px; line-height: 1.7; font-size: .98rem; }

.tool-related-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--sp-4);
  margin: var(--sp-4) 0 0;
  padding: 0;
  max-width: none;
}
.tool-related-list li { margin: 0; }
.tool-related-list a {
  display: grid;
  gap: var(--sp-2);
  height: 100%;
  padding: var(--sp-4) var(--sp-5);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
  box-shadow: var(--shadow-card);
  transition: border-color .15s ease, transform .15s ease, box-shadow .15s ease;
}
.tool-related-list a:hover { border-color: var(--brand); transform: translateY(-2px); box-shadow: var(--shadow-panel); }
.tool-related-list strong { color: var(--brand); font-size: 1.05rem; font-weight: 800; }
.tool-related-list span { color: var(--muted); font-size: .88rem; line-height: 1.5; }

/* ---------- 10. Hub cards ---------- */

.tool-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--sp-4);
  margin-top: var(--sp-6);
}
.tool-card {
  display: grid;
  gap: var(--sp-2);
  align-content: start;
  padding: var(--sp-5);
  border: 1px solid var(--line);
  border-radius: var(--radius-panel);
  background: var(--surface);
  box-shadow: var(--shadow-card);
  transition: border-color .15s ease, transform .15s ease;
}
.tool-card:hover { border-color: var(--brand); transform: translateY(-2px); }
.tool-card h2 { font-size: 1.12rem; margin: 0; }
.tool-card h2 a { color: var(--ink); text-decoration: none; }
.tool-card h2 a::after { content: ""; position: absolute; inset: 0; }
.tool-card { position: relative; }
.tool-card h2 a:hover { color: var(--brand); }
.tool-card p { margin: 0; color: var(--muted); font-size: .9rem; }
.tool-card .tool-card-cta {
  margin-top: var(--sp-2);
  color: var(--brand);
  font-weight: 700;
  font-size: .9rem;
}

/* ---------- 11. Checklist ---------- */

.tool-checklist { display: grid; gap: var(--sp-4); }

.tool-check-group {
  border: 1px solid var(--line);
  border-radius: var(--radius-control);
  padding: var(--sp-4);
  background: var(--surface);
}
.tool-check-group h2 {
  font-size: 1rem;
  margin: 0 0 var(--sp-2);
  padding-bottom: var(--sp-2);
  border-bottom: 1px solid var(--line);
}

.tool-check-item {
  display: flex;
  gap: var(--sp-3);
  align-items: flex-start;
  padding: var(--sp-3) 0;
  border-top: 1px solid var(--line);
  cursor: pointer;
  min-height: var(--tap-min);
}
.tool-check-item:first-of-type { border-top: 0; }
.tool-check-item:hover { background: var(--surface-sunk); }
.tool-check-item input {
  margin-top: 5px;
  width: 20px;
  height: 20px;
  flex: none;
  accent-color: var(--brand);
  cursor: pointer;
}
.tool-check-item span { display: grid; gap: 2px; }
.tool-check-item strong { font-weight: 700; }
.tool-check-item small { color: var(--muted); font-size: .82rem; line-height: 1.5; }
.tool-check-item.is-done strong { text-decoration: line-through; color: var(--muted); }

.tool-progress { display: grid; gap: var(--sp-2); margin-bottom: var(--sp-4); }
.tool-progress-head {
  display: flex;
  justify-content: space-between;
  gap: var(--sp-3);
  font-size: .88rem;
  font-weight: 700;
  color: var(--ink-soft);
}
.tool-progress-track {
  height: 8px;
  border-radius: var(--radius-pill);
  background: var(--surface-sunk);
  border: 1px solid var(--line);
  overflow: hidden;
}
.tool-progress-bar {
  height: 100%;
  width: 0;
  background: var(--brand);
  border-radius: inherit;
  transition: width .25s ease;
}

/* ---------- 12. Footer ---------- */

.tool-footer {
  border-top: 1px solid var(--line);
  margin-top: var(--sp-8);
  padding-top: var(--sp-5);
  color: var(--muted);
  font-size: .89rem;
}
.tool-footer a { color: inherit; }
.tool-footer a:hover { color: var(--brand); }

/* ---------- 13. Responsive ---------- */

@media (max-width: 800px) {
  .tool-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  body { font-size: 16px; }
  .tool-page { padding: var(--sp-4) var(--sp-4) var(--sp-7); }
  .tool-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--sp-3);
    padding-bottom: var(--sp-4);
  }
  .tool-nav { margin-left: calc(var(--sp-3) * -1); }
  .tool-input-grid { grid-template-columns: 1fr; }
  .tool-goal-row,
  .tool-check-grid { grid-template-columns: 1fr; }
  .tool-tooltip { display: none; }
  .tool-analysis-grid { grid-template-columns: 1fr; }
  .tool-actions > .tool-button { width: 100%; }
  .tool-result-list > div { display: grid; gap: 0; }
  .tool-result-list dd { text-align: left; }
  .tool-answer { padding: var(--sp-4); }
}

/* ---------- 14. KGK Concept Cards & Article Formatting ---------- */

.kgk-article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); align-items: stretch;
  gap: var(--sp-5);
  margin-top: var(--sp-4);
  width: 100%;
}

.kgk-concept-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-panel);
  background: var(--surface);
  padding: var(--sp-5) var(--sp-6);
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  transition: transform .2s ease, box-shadow .2s ease;
}
.kgk-concept-card:hover {
  border-color: var(--line-strong);
}

.kgk-concept-card--highlight {
  border-color: var(--brand-line);
  background: var(--brand-soft);
}

.kgk-concept-badge {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  padding: var(--sp-1) var(--sp-3);
  border-radius: var(--radius-pill);
  background: var(--brand);
  color: var(--brand-ink);
  font-size: .78rem;
  font-weight: 800;
  margin-bottom: var(--sp-3);
}

.kgk-concept-card h3 {
  font-size: 1.15rem;
  color: var(--ink);
  margin: 0 0 var(--sp-2);
}

.kgk-concept-card p {
  color: var(--ink-soft);
  font-size: .93rem;
  line-height: 1.65;
  margin: 0 0 var(--sp-3);
}

.kgk-concept-list {
  margin: 0;
  padding-left: 1.2rem;
  display: grid;
  gap: var(--sp-2);
  color: var(--ink-soft);
  font-size: .91rem;
  line-height: 1.6;
}

.kgk-subgrid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--sp-3);
  margin-top: var(--sp-3);
  padding-top: var(--sp-3);
  border-top: 1px solid var(--line);
}

.kgk-subgrid h4 {
  margin: 0 0 var(--sp-2);
  font-size: .95rem;
  color: var(--ink);
}

.kgk-subgrid ul {
  margin: 0;
  padding-left: 1.1rem;
  display: grid;
  gap: var(--sp-1);
  font-size: .88rem;
  color: var(--ink-soft);
}

@media print {
  .tool-nav, .tool-skip, .tool-actions { display: none; }
  .tool-panel, .tool-card { box-shadow: none; }
}


/* ---------- 15. Infographic & Visual Cards ---------- */

.kgk-infographic {
  display: grid;
  gap: var(--sp-4);
  margin-top: var(--sp-4);
  width: 100%;
}

.kgk-info-banner {
  background: var(--brand-soft);
  border: 1px solid var(--brand-line);
  border-radius: var(--radius-panel);
  padding: var(--sp-4) var(--sp-5);
}

.kgk-info-pill {
  display: inline-block;
  padding: 2px var(--sp-3);
  border-radius: var(--radius-pill);
  background: var(--brand);
  color: var(--brand-ink);
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .05em;
  margin-bottom: var(--sp-2);
}

.kgk-info-banner h3 {
  font-size: 1.2rem;
  color: var(--ink);
  margin: 0 0 var(--sp-2);
}

.kgk-info-banner p {
  color: var(--ink-soft);
  font-size: .92rem;
  line-height: 1.65;
  margin: 0;
}

.kgk-info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); align-items: stretch;
  gap: var(--sp-4);
}

.kgk-info-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-panel);
  background: var(--surface);
  padding: var(--sp-4) var(--sp-5);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  box-shadow: var(--shadow-card);
}

.kgk-card-header {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding-bottom: var(--sp-2);
  border-bottom: 1px solid var(--line);
}

.kgk-card-num-old {
  font-size: 1.6rem;
  line-height: 1;
}

.kgk-card-header h4 {
  margin: 0;
  font-size: 1.05rem;
  color: var(--ink);
}

.kgk-card-sub {
  font-size: .78rem;
  color: var(--muted);
}

.kgk-card-body {
  display: grid;
  gap: var(--sp-2);
}

.kgk-pill-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-control);
  background: var(--surface-sunk);
  font-size: .88rem;
}

.kgk-pill-item strong {
  color: var(--ink);
  font-size: .86rem;
}

.kgk-pill-item span {
  color: var(--ink-soft);
  font-size: .82rem;
}

.kgk-metric-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-control);
  background: var(--surface-sunk);
  font-size: .86rem;
}

.kgk-metric-row span {
  color: var(--ink-soft);
}

.kgk-metric-row strong {
  color: var(--brand);
  font-weight: 800;
}

/* ---------- 14. E-E-A-T Trust & YMYL Components ---------- */

.tool-eeat-badge {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  padding: var(--sp-4) var(--sp-5);
  border: 1px solid var(--brand-line);
  border-radius: var(--radius-panel);
  background: var(--surface);
  box-shadow: var(--shadow-card);
  margin-top: var(--sp-6);
}

.tool-eeat-avatar {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--brand-gradient);
  color: var(--brand-ink);
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 1.25rem;
  flex: none;
  box-shadow: 0 4px 12px rgba(18, 60, 53, .15);
}

.tool-eeat-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.tool-eeat-role {
  display: block;
  font-size: .78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--brand);
}

.tool-eeat-name {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}

.tool-eeat-desc {
  display: block;
  font-size: .84rem;
  color: var(--muted);
  line-height: 1.5;
}

.tool-trust-banner {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-control);
  background: var(--ok-bg);
  border: 1px solid var(--ok-line);
  color: var(--ok-ink);
  font-size: .88rem;
  font-weight: 600;
  margin-top: var(--sp-4);
}

.tool-trust-banner svg {
  flex: none;
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.tool-ymyl-disclaimer {
  display: grid;
  gap: var(--sp-1);
  border: 1px solid var(--line-strong);
  border-left: 4px solid var(--brand);
  border-radius: 0 var(--radius-control) var(--radius-control) 0;
  background: var(--surface-sunk);
  color: var(--ink-soft);
  padding: var(--sp-3) var(--sp-4);
  margin-top: var(--sp-5);
  font-size: .86rem;
  line-height: 1.6;
}

.tool-page h1,
.tool-page h2,
.tool-page h3 {
  font-family: var(--font-heading);
}

/* ============================================================
   §16. Blueprint skin — engineering-schematic treatment layered on
   the existing token system. CSS-only (no markup edits), so it reaches
   every hand-authored tool page AND every WordPress embed, since
   tool.css is inlined + scoped under .kgk-tool at build time.
   Brand colors are untouched — only structure/decoration change.
   REVERT: delete this §16 block and restore the radius tokens in §1
   (original saved as tool.css.bak-YYYYMMDD).
   ============================================================ */

/* --- 16.1 Measurement grid behind the tool area only ---
   Bound to .tool-page (→ .kgk-tool in WP) so it never leaks to the host theme. */
.tool-page {
  background-image:
    linear-gradient(var(--bp-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bp-grid) 1px, transparent 1px);
  background-size: 30px 30px;
  background-position: center top;
}

/* --- 16.2 Registration corner marks ---
   Four L-brackets drawn purely with background gradients, so any plate
   gets schematic corners with no extra DOM. */
.tool-hero,
.tool-panel,
.tool-form-section,
.tool-card,
.kgk-info-card,
.kgk-info-banner,
.kgk-concept-card,
.tool-faq details,
.tool-related-list a,
.tool-eeat-badge {
  background-image:
    linear-gradient(var(--bp-corner), var(--bp-corner)),
    linear-gradient(var(--bp-corner), var(--bp-corner)),
    linear-gradient(var(--bp-corner), var(--bp-corner)),
    linear-gradient(var(--bp-corner), var(--bp-corner)),
    linear-gradient(var(--bp-corner), var(--bp-corner)),
    linear-gradient(var(--bp-corner), var(--bp-corner)),
    linear-gradient(var(--bp-corner), var(--bp-corner)),
    linear-gradient(var(--bp-corner), var(--bp-corner));
  background-repeat: no-repeat;
  background-size:
    var(--bp-corner-size) var(--bp-corner-w), var(--bp-corner-w) var(--bp-corner-size),
    var(--bp-corner-size) var(--bp-corner-w), var(--bp-corner-w) var(--bp-corner-size),
    var(--bp-corner-size) var(--bp-corner-w), var(--bp-corner-w) var(--bp-corner-size),
    var(--bp-corner-size) var(--bp-corner-w), var(--bp-corner-w) var(--bp-corner-size);
  background-position:
    left top, left top,
    right top, right top,
    left bottom, left bottom,
    right bottom, right bottom;
}

/* --- 16.3 Flatten to schematic plates (no elevation) --- */
.tool-header,
.tool-panel,
.tool-card,
.tool-form-section,
.kgk-info-card,
.kgk-concept-card,
.tool-faq details,
.tool-related-list a,
.tool-eeat-badge,
.tool-answer,
.tool-callout,
.tool-related-list a:hover { box-shadow: none; }

/* neutralise hover lifts — blueprints don't float */
.tool-card:hover,
.tool-related-list a:hover,
.tool-feature-grid > li:hover,
.tool-section > ul > li:hover,
.kgk-concept-card:hover,
.tool-button:hover { transform: none; }

/* --- 16.4 Header → slim blueprint nav bar --- */
.tool-header {
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--bp-hair);
  padding: var(--sp-3) 0 var(--sp-4);
}
.tool-nav a {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0 var(--sp-3);
}
.tool-nav a:hover,
.tool-nav a:focus-visible { background: transparent; color: var(--brand); }

/* --- 16.5 Technical mono kickers / labels / codes --- */
.tool-breadcrumb {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.tool-eyebrow {
  border: 0;
  background: transparent;
  padding: 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--brand);
  font-weight: 600;
}
.kgk-info-pill,
.kgk-concept-badge,
.tool-chip,
.tool-eeat-role {
  font-family: var(--font-mono);
  letter-spacing: .1em;
  text-transform: uppercase;
}
.tool-note {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .04em;
}

/* --- 16.6 Tool codes on hub cards via CSS counters (no markup) --- */
.tool-card-grid { counter-reset: kgktool; }
.tool-card {
  counter-increment: kgktool;
  background-color: transparent;
  padding-top: calc(var(--sp-5) + 4px);
}
.tool-card::before {
  content: "F-" counter(kgktool, decimal-leading-zero);
  order: -1;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--muted);
}
:root[data-brand="songtor"] .tool-card::before { content: "L-" counter(kgktool, decimal-leading-zero); }
.tool-card:hover {
  background-color: color-mix(in srgb, var(--brand) 6%, transparent);
  border-color: var(--brand);
}

/* --- 16.7 Buttons → flat solid accent --- */
.tool-button {
  background: var(--brand);
  border: 1px solid var(--brand);
  box-shadow: none;
  font-family: var(--font-heading);
  letter-spacing: .02em;
}
.tool-button:hover {
  background: var(--brand-strong);
  border-color: var(--brand-strong);
  box-shadow: none;
}
.tool-button--ghost {
  background: transparent;
  border: 1px solid var(--bp-hair);
  color: var(--brand);
}
.tool-button--ghost:hover { background: color-mix(in srgb, var(--brand) 8%, transparent); }

/* --- 16.8 Brand-correct focus ring (was hardcoded emerald) --- */
.tool-form input:focus,
.tool-form select:focus {
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 22%, transparent);
}

/* --- 16.9 Answer plate stays the focal fill, just squared + flat --- */
.tool-answer { border-color: var(--brand-line); }

/* --- 16.10 Square the remaining decorative circles for cohesion --- */
.tool-section > ul > li::before,
.tool-feature-grid > li::before,
.tool-faq summary::before,
.tool-eeat-avatar { border-radius: 0; }



/* ============================================================
   §17. Premium Modern UI/UX Design Layer (Vibrant & Interactive)
   ============================================================ */

:root {
  --radius-control: 8px;
  --radius-panel: 16px;
  --radius-card: 14px;
  --radius-pill: 9999px;
  
  --shadow-panel: 0 12px 32px -4px rgba(14, 56, 47, 0.12), 0 4px 12px -2px rgba(14, 56, 47, 0.06);
  --shadow-card: 0 8px 24px -2px rgba(15, 23, 42, 0.08), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
}

/* Header & Brand Navigation */
.kgk-site-brand, .tool-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.75rem !important;
  background: rgba(255, 255, 255, 0.95) !important;
  backdrop-filter: blur(12px);
  border: 1px solid var(--line) !important;
  border-radius: var(--radius-panel) !important;
  box-shadow: var(--shadow-card) !important;
  margin-bottom: 2rem !important;
}

.tool-brand-logo, .tool-brand {
  font-family: var(--font-heading) !important;
  font-size: 1.4rem !important;
  font-weight: 800 !important;
  color: var(--brand) !important;
  text-decoration: none !important;
}

.kgk-site-nav, .tool-nav {
  display: flex;
  align-items: center;
  gap: 0.75rem !important;
}

.kgk-site-nav a, .tool-nav a {
  padding: 0.5rem 1rem !important;
  border-radius: var(--radius-pill) !important;
  color: var(--ink-soft) !important;
  font-size: 0.95rem !important;
  font-weight: 600 !important;
  text-decoration: none !important;
  transition: all 0.2s ease !important;
}

.kgk-site-nav a:hover, .kgk-site-nav a.is-active,
.tool-nav a:hover, .tool-nav a.is-active {
  background: var(--brand-soft) !important;
  color: var(--brand) !important;
}

.tool-btn-auth {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1.2rem;
  border-radius: var(--radius-pill);
  background: var(--brand-gradient);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.9rem;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(14, 56, 47, 0.2);
  transition: all 0.2s ease;
}
.tool-btn-auth:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(14, 56, 47, 0.3);
}

/* Card & Interactive Hover Fixes */
.tool-card, .kgk-concept-card, .tool-panel {
  border-radius: var(--radius-panel) !important;
  box-shadow: var(--shadow-card) !important;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1) !important;
}

.tool-card:hover, .kgk-concept-card:hover {
  transform: translateY(-4px) !important;
  box-shadow: var(--shadow-panel) !important;
  border-color: var(--brand-line) !important;
}

.tool-button {
  border-radius: var(--radius-pill) !important;
  transition: all 0.2s ease !important;
}
.tool-button:hover {
  transform: translateY(-2px) !important;
}

/* Auth Modal Styling */
.auth-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.auth-modal-card {
  background: #ffffff;
  border-radius: 20px;
  max-width: 440px;
  width: 100%;
  padding: 2rem;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
  text-align: center;
}
