/* Cal.com-style design tokens (implementation.md Part 1) */
:root {
  --primary: #111111;
  --primary-active: #242424;
  --primary-disabled: #e5e7eb;
  --ink: #111111;
  --body: #374151;
  --muted: #6b7280;
  --muted-soft: #898989;
  --hairline: #e5e7eb;
  --hairline-soft: #f3f4f6;
  --canvas: #ffffff;
  --surface-soft: #f8f9fa;
  --surface-card: #f5f5f5;
  --surface-dark: #101010;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --font-display: "Cal Sans", "Inter", sans-serif;
  --font-ui: "Inter", sans-serif;
  --font-mono: "JetBrains Mono", monospace;
}

* { box-sizing: border-box; }

/* always reserve scrollbar space: stops the centered layout sliding sideways
   when switching between short and tall step views */
html { overflow-y: scroll; }

body {
  margin: 0;
  background: var(--canvas);
  color: var(--body);
  font: 400 16px/1.5 var(--font-ui);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
/* flex items with margin:auto shrink-wrap to their content, which made the layout's
   width change per step — force full width so max-width + auto margins center stably */
body > * { width: 100%; }
/* push the footer to the bottom of the window on pages shorter than the viewport */
body > footer { margin-top: auto; }

header {
  display: flex; align-items: baseline; gap: 16px; flex-wrap: wrap;
  padding: 20px 32px;
  border-bottom: 1px solid var(--hairline-soft);
}
header h1 {
  font: 600 28px/1.2 var(--font-display);
  letter-spacing: -0.5px;
  color: var(--ink);
  margin: 0;
}
header p { margin: 0; font-size: 14px; }

main.workbench {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  align-items: start;
  max-width: 1680px;
  margin: 0 auto;
  padding: 24px 32px 96px;
}
.panel-steps {
  display: flex; flex-direction: column; gap: 12px; min-width: 0;
  position: sticky; top: 24px;
}
.panel-detail { display: flex; flex-direction: column; gap: 24px; min-width: 0; }

.step-card {
  display: flex; flex-direction: column; gap: 4px; text-align: left;
  background: var(--canvas); border: 1px solid var(--hairline);
  border-radius: var(--radius-lg); padding: 16px 20px; cursor: pointer;
}
.step-card .step-title { font: 600 18px/1.4 var(--font-display); letter-spacing: -0.2px; color: var(--ink); }
.step-card .step-sub { font: 400 13px/1.4 var(--font-ui); color: var(--muted); }
.step-card:hover:not(:disabled) { background: var(--surface-soft); }
.step-card.active { border-color: var(--primary); background: var(--surface-soft); }
.step-card:disabled { opacity: 0.45; cursor: default; }

@media (max-width: 1000px) {
  main.workbench { grid-template-columns: 1fr; }
  .panel-steps { position: static; flex-direction: row; flex-wrap: wrap; }
  .panel-steps .step-card { flex: 1 1 40%; }
}

.placeholder { text-align: center; padding: 64px 24px; }

h2 { font: 600 22px/1.3 var(--font-display); letter-spacing: -0.3px; color: var(--ink); margin: 0 0 16px; }
h3 { font: 600 18px/1.4 var(--font-ui); color: var(--ink); margin: 24px 0 12px; }
h4 { font: 600 16px/1.4 var(--font-ui); color: var(--ink); margin: 16px 0 8px; }

.muted { color: var(--muted); }
.small { font-size: 14px; }
.mono { font-family: var(--font-mono); font-size: 14px; }
.hidden { display: none !important; }

.card {
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.upload-row { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 12px; }
.file-label {
  display: flex; flex-direction: column; gap: 8px;
  font-weight: 500; color: var(--ink); font-size: 14px;
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: 12px 16px;
}

.banner { border-radius: var(--radius-md); padding: 12px 16px; margin: 12px 0; font-size: 14px; }
.banner.error { background: #fef2f2; border: 1px solid var(--error); color: #991b1b; }
.banner.warning { background: #fffbeb; border: 1px solid var(--warning); color: #92400e; }

.pills { display: inline-flex; gap: 4px; flex-wrap: wrap; background: var(--surface-soft); border-radius: 9999px; padding: 4px; margin-bottom: 16px; }
.pill {
  border: none; background: transparent; cursor: pointer;
  border-radius: 9999px; padding: 8px 16px;
  font: 500 14px var(--font-ui); color: var(--muted);
}
.pill.active { background: var(--primary); color: #fff; }

.btn-primary {
  background: var(--primary); color: #fff; border: none; cursor: pointer;
  border-radius: var(--radius-md); padding: 12px 24px;
  font: 600 16px var(--font-ui); margin-top: 16px;
}
.btn-primary:active { background: var(--primary-active); }
.btn-primary:disabled { background: var(--primary-disabled); color: var(--muted); cursor: default; }

table { border-collapse: collapse; width: 100%; margin: 8px 0; }
th, td { border: 1px solid var(--hairline); padding: 8px 12px; text-align: right; }
th { background: var(--surface-card); color: var(--ink); font: 600 13px var(--font-ui); }
th:first-child, td:first-child { text-align: left; }
td { font-family: var(--font-mono); font-size: 14px; color: var(--body); }
td.label { font-family: var(--font-ui); font-weight: 500; color: var(--ink); }
tr.rank-1 td { background: #ecfdf5; }

.table-wrap { overflow-x: auto; }

.param-table td { text-align: left; padding: 6px 8px; }
.param-table td.label { white-space: nowrap; }
.param-table input[type="number"] { width: 100%; min-width: 64px; }
.param-table select { width: 100%; }
.param-table input:disabled {
  background: var(--surface-card);
  border-color: var(--hairline-soft);
  color: var(--muted-soft);
}
input[type="number"], input[type="text"], select {
  border: 1px solid var(--hairline); border-radius: var(--radius-sm);
  padding: 6px 8px; font: 400 14px var(--font-mono); color: var(--ink); width: 90px;
}
input[type="text"] { font-family: var(--font-ui); }
.param-table input[type="text"] { width: 100%; min-width: 96px; }
select { font-family: var(--font-ui); width: auto; }
input[type="range"] { accent-color: var(--primary); }

.slider-row { display: flex; gap: 12px; align-items: center; margin: 6px 0; font-size: 14px; }
.slider-row .name { width: 160px; font-weight: 500; color: var(--ink); }
.slider-row .val { font-family: var(--font-mono); width: 56px; text-align: right; }

.pairwise input { width: 64px; text-align: right; }
.pairwise td.mirror { color: var(--muted-soft); }

.saaty-row { margin: 12px 0; }
.saaty-names {
  display: flex; justify-content: space-between; align-items: baseline; gap: 8px;
  font: 500 14px var(--font-ui); color: var(--ink); margin-bottom: 4px;
}
.saaty-scale { display: flex; gap: 2px; }
.saaty-cell {
  flex: 1; min-width: 0; height: 26px; padding: 0; cursor: pointer;
  border: 1px solid var(--hairline); border-radius: var(--radius-sm);
  background: var(--canvas); color: var(--muted);
  font: 400 11px var(--font-mono);
}
.saaty-cell.equal { border-color: var(--muted); }
.saaty-cell:hover { background: var(--surface-soft); }
.saaty-cell.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ---------------------------------------------------------------- charts */
.chart { width: 100%; max-width: 680px; display: block; margin: 8px 0; }
.chart.graph { max-width: 520px; }
.chart-label { font: 11px var(--font-mono); fill: var(--muted); }
.chart .node-label { fill: var(--ink); font-size: 10px; }
.chart-legend { display: flex; flex-wrap: wrap; gap: 4px 16px; margin: 8px 0 0; font-size: 13px; color: var(--body); }
.chart-legend span { display: inline-flex; align-items: center; gap: 6px; }
.chart-legend i { width: 10px; height: 10px; border-radius: 2px; display: inline-block; }

.format-guide { margin: 8px 0 4px; }
.format-guide summary {
  cursor: pointer; font: 500 14px var(--font-ui); color: var(--ink);
  padding: 8px 0;
}
.format-guide .mini-example { max-width: 480px; margin: 8px 0; }
.format-guide .mini-example td, .format-guide .mini-example th { padding: 4px 10px; font-size: 12px; }
.format-guide ul { padding-left: 18px; }
.format-guide li { margin-bottom: 4px; }
.format-guide a.btn-ghost { display: inline-block; text-decoration: none; margin: 4px 0 8px; }

.example-row { display: flex; gap: 12px; flex-wrap: wrap; margin: 8px 0 20px; }
.example-card {
  display: flex; flex-direction: column; gap: 4px; text-align: left; cursor: pointer;
  flex: 1 1 200px; max-width: 280px;
  background: var(--surface-soft); border: 1px solid var(--hairline);
  border-radius: var(--radius-md); padding: 12px 16px;
}
.example-card:hover { border-color: var(--primary); }

.wizard-card {
  background: var(--surface-soft); border: 1px solid var(--hairline);
  border-radius: var(--radius-lg); padding: 16px 20px; margin: 4px 0 16px;
}
.wizard-opt { display: block; width: 100%; text-align: left; margin: 0 0 8px; }
#wizard { margin-bottom: 8px; }

.narrative {
  background: var(--surface-card); border-radius: var(--radius-lg);
  padding: 16px 20px; margin: 12px 0 4px;
}
.narrative p { margin: 0 0 12px; }
.narrative p:last-child { margin-bottom: 0; }
#narrate-box { margin: 12px 0; }

.bar-cell { width: 30%; min-width: 120px; }
.score-bar { height: 10px; background: var(--ink); border-radius: 9999px; min-width: 4px; }
tr.rank-1 .score-bar { background: var(--success); }

.doctor-row {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  background: #fffbeb; border: 1px solid var(--warning); border-radius: var(--radius-md);
  padding: 8px 12px; margin: 6px 0; font-size: 14px;
}

.results-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.results-actions { display: flex; gap: 8px; flex-wrap: wrap; }
#share-url { width: 100%; margin-top: 8px; font-family: var(--font-ui); font-size: 12px; color: var(--muted, #666); }
.btn-ghost {
  background: var(--canvas); color: var(--ink); cursor: pointer;
  border: 1px solid var(--hairline); border-radius: var(--radius-md);
  padding: 8px 14px; font: 500 14px var(--font-ui);
}
.btn-ghost:hover { background: var(--surface-soft); }

footer {
  background: var(--surface-dark); color: var(--muted-soft);
  padding: 32px 24px; text-align: center; font-size: 14px;
}

/* ---------------------------------------------------------------- landing */
.landing-nav {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1100px; margin: 0 auto; padding: 24px 32px;
}
.landing-nav .brand { display: flex; align-items: center; gap: 10px; font: 600 22px/1.3 var(--font-display); letter-spacing: -0.3px; color: var(--ink); text-decoration: none; }
.brand-mark { display: block; flex-shrink: 0; }
header h1 a { text-decoration: none; }
.landing-nav .btn-primary { margin: 0; text-decoration: none; }

.landing .hero { max-width: 1100px; margin: 0 auto; padding: 96px 32px 48px; text-align: center; }
.landing .hero h1 {
  font: 600 64px/1.05 var(--font-display);
  letter-spacing: -2px; color: var(--ink); margin: 0 0 24px;
}
.landing .hero > p:first-of-type { max-width: 640px; margin: 0 auto 32px; font-size: 18px; }
.btn-lg { display: inline-block; padding: 14px 32px; text-decoration: none; }
.landing .hero .small { margin-top: 16px; }

.fragment-band { padding: 48px 32px 96px; border-bottom: 1px solid var(--hairline-soft); }
.fragment-card { max-width: 560px; margin: 0 auto; }
.fragment-card .pills { pointer-events: none; }

.landing .features {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px; max-width: 1100px; margin: 0 auto; padding: 96px 32px;
}
.landing .feature h3 { margin: 0 0 8px; font: 600 22px/1.3 var(--font-display); letter-spacing: -0.3px; }
.landing .feature p { margin: 0; color: var(--muted); }

.cta-band { text-align: center; padding: 96px 32px; background: var(--surface-soft); }

a.method-card { text-decoration: none; border: 1px solid var(--hairline); border-radius: var(--radius-lg); padding: 20px; display: block; }
a.method-card:hover { border-color: var(--primary); }
a.method-card p { color: var(--muted); }

.method-doc { max-width: 760px; margin: 0 auto; padding: 48px 32px 96px; }
.method-doc h1 { font: 600 48px/1.1 var(--font-display); letter-spacing: -1.5px; color: var(--ink); margin: 8px 0; }
.method-doc h2 { font: 600 24px/1.25 var(--font-display); letter-spacing: -0.4px; color: var(--ink); margin: 40px 0 12px; }
.method-doc .lede { font-size: 20px; color: var(--ink); margin: 24px 0; }
.method-doc ol li, .method-doc ul li { margin-bottom: 10px; line-height: 1.6; }
.method-doc .cta-band { margin-top: 56px; }
.bibtex {
  background: var(--surface-card); border: 1px solid var(--hairline);
  border-radius: var(--radius-md); padding: 16px;
  font: 400 12px/1.5 var(--font-mono); overflow-x: auto;
}
.cta-band h2 { font: 600 36px/1.15 var(--font-display); letter-spacing: -1px; margin: 0 0 24px; }

@media (max-width: 720px) {
  .landing .hero h1 { font-size: 40px; letter-spacing: -1px; }
  .landing .hero { padding-top: 48px; }
}