:root {
  --sql-paper: #fbfaf6;
  --sql-surface: #ffffff;
  --sql-soft: #f6f3ed;
  --sql-ink: #10283d;
  --sql-copy: #52687a;
  --sql-muted: #748493;
  --sql-orange: #c96838;
  --sql-orange-soft: #fff1e8;
  --sql-teal: #2f817e;
  --sql-teal-soft: #eaf6f3;
  --sql-violet: #715c8e;
  --sql-line: #dedfd9;
  --sql-line-soft: #ebeae4;
  --sql-code: #122131;
  --sql-radius: 14px;
  --sql-max: 1540px;
  color: var(--sql-ink);
  background: var(--sql-paper);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { background: var(--sql-paper); scroll-behavior: smooth; }
body { margin: 0; min-height: 100vh; overflow-x: hidden; background: var(--sql-paper); color: var(--sql-ink); }
button, textarea, select, a { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }

.skip-link {
  position: fixed;
  z-index: 2000;
  top: 10px;
  left: 10px;
  padding: 10px 13px;
  border-radius: 8px;
  color: #fff;
  background: var(--sql-ink);
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

.small-label,
.eyebrow {
  margin: 0;
  color: var(--sql-orange);
  font-size: 10px;
  font-weight: 850;
  line-height: 1.2;
  letter-spacing: .15em;
  text-transform: uppercase;
}

.sql-hero {
  padding: 24px max(28px, calc((100vw - var(--sql-max)) / 2 + 28px)) 26px;
  overflow: hidden;
  border-bottom: 1px solid var(--sql-line);
  background:
    linear-gradient(90deg, rgba(201, 104, 56, .05), transparent 42%),
    var(--sql-paper);
  box-shadow: inset 0 3px 0 var(--sql-orange);
}

.sql-hero__inner {
  position: relative;
  width: min(var(--sql-max), 100%);
  min-height: 118px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 168px;
  gap: 44px;
  align-items: center;
}

.sql-hero h1 {
  position: relative;
  z-index: 2;
  margin: 5px 0 0;
  color: var(--sql-ink);
  font: 600 clamp(34px, 3.1vw, 48px)/1 Georgia, "Times New Roman", serif;
  letter-spacing: -.045em;
}

.sql-hero .subtitle {
  position: relative;
  z-index: 2;
  max-width: 690px;
  margin: 10px 0 0;
  color: var(--sql-copy);
  font-size: 14px;
  line-height: 1.5;
}

.hero-progress { position: relative; z-index: 2; align-self: center; }
.hero-progress strong {
  display: block;
  margin-bottom: 9px;
  color: var(--sql-ink);
  font: 600 27px/1 Georgia, "Times New Roman", serif;
  text-align: right;
}
.hero-progress-track,
.progress-track {
  height: 3px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--sql-line);
}
.hero-progress-track span,
.progress-track span {
  display: block;
  width: calc(100% / 14);
  height: 100%;
  border-radius: inherit;
  background: var(--sql-orange);
  transition: width .22s ease;
}

.sql-relations-art {
  position: absolute;
  z-index: 1;
  top: 50%;
  right: 230px;
  width: 260px;
  opacity: .16;
  transform: translateY(-50%);
  pointer-events: none;
}
.sql-relations-art svg { display: block; width: 100%; }
.sql-art-lines path { fill: none; stroke: var(--sql-orange); stroke-width: 1.5; stroke-dasharray: 3 7; }
.sql-art-table rect { fill: #fff; stroke: var(--sql-orange); stroke-width: 1.5; }
.sql-art-table circle { fill: var(--sql-orange); }
.sql-art-table path { fill: none; stroke: var(--sql-orange); stroke-width: 1.2; stroke-linecap: round; }
.sql-art-table.alternate rect { stroke: var(--sql-teal); }
.sql-art-table.alternate circle { fill: var(--sql-teal); }

.sql-lab-shell {
  width: min(var(--sql-max), 100%);
  min-height: 760px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
}

.journey {
  min-width: 0;
  padding: 29px 20px 34px;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--sql-line);
}
.journey-heading { display: grid; gap: 7px; padding: 0 9px; }
.journey-heading strong { font-size: 18px; font-weight: 680; letter-spacing: -.02em; }

.point-navigation { display: grid; gap: 2px; margin-top: 18px; }
.point-button {
  width: 100%;
  min-height: 38px;
  padding: 8px 10px;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 8px;
  align-items: center;
  border: 0;
  border-radius: 9px;
  color: var(--sql-copy);
  background: transparent;
  text-align: left;
  font-size: 12px;
}
.point-button:hover { color: var(--sql-ink); background: var(--sql-soft); }
.point-button.active { color: var(--sql-orange); background: var(--sql-orange-soft); font-weight: 750; }
.point-number { opacity: .72; font-size: 10px; font-weight: 800; }

.compact-stage-picker { display: none; }
.progress-area { margin: 19px 9px 0; }
.progress-meta { display: flex; justify-content: space-between; gap: 12px; margin-bottom: 8px; color: var(--sql-muted); font-size: 10px; }
.guide-link {
  margin: 17px 9px 0;
  padding-top: 15px;
  border-top: 1px solid var(--sql-line-soft);
  color: var(--sql-copy);
  font-size: 11px;
  font-weight: 700;
  text-decoration: none;
}
.guide-link:hover { color: var(--sql-orange); }

.presentation { min-width: 0; padding: 30px 36px 46px; }
.presentation-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: start;
  margin-bottom: 24px;
}
#section-kicker { margin-bottom: 7px; }
#point-title {
  max-width: 840px;
  margin: 0;
  color: var(--sql-ink);
  font: 600 clamp(31px, 3.2vw, 45px)/1.04 Georgia, "Times New Roman", serif;
  letter-spacing: -.04em;
}

.navigation-buttons,
.query-actions,
.editor-actions { display: flex; flex-wrap: wrap; gap: 8px; }

button {
  min-height: 40px;
  padding: 0 13px;
  border: 1px solid #d8cec7;
  border-radius: 9px;
  color: var(--sql-ink);
  background: #fff;
  font-size: 13px;
  font-weight: 680;
  box-shadow: none;
}
button:hover { border-color: #c9ad9c; background: #fff8f4; }
button:disabled { cursor: default; opacity: .42; }
.primary-button { border-color: var(--sql-orange); color: #fff; background: var(--sql-orange); }
.primary-button:hover { border-color: #b55a2e; background: #b55a2e; }
button:focus-visible, a:focus-visible, textarea:focus-visible, select:focus-visible {
  outline: 3px solid rgba(201, 104, 56, .28);
  outline-offset: 3px;
}

.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(290px, 330px);
  gap: clamp(30px, 3vw, 48px);
  align-items: start;
}
.experiment-pane { min-width: 0; }
.question-block { margin-bottom: 22px; }
#central-question {
  max-width: 880px;
  margin: 8px 0 0;
  color: var(--sql-ink);
  font: 600 clamp(21px, 2.05vw, 29px)/1.28 Georgia, "Times New Roman", serif;
  letter-spacing: -.022em;
}

.experiment-brief {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 20px;
  align-items: start;
  margin-bottom: 14px;
  padding: 16px 18px;
  border: 1px solid var(--sql-line);
  border-radius: 11px;
  background: var(--sql-soft);
}
.experiment-brief p { max-width: 760px; margin: 6px 0 0; color: var(--sql-copy); font-size: 14px; line-height: 1.55; }
.runtime-status { margin: 0; color: var(--sql-muted); font-size: 10px; font-weight: 750; letter-spacing: .04em; }
.runtime-status.is-ready { color: var(--sql-teal); }

.query-actions { margin-bottom: 12px; }
.query-support p,
.query-support pre { margin: 0 0 12px; padding: 12px 14px; border-radius: 9px; }
.query-support p { border: 1px solid #efd7c9; color: #76503d; background: var(--sql-orange-soft); font-size: 13px; line-height: 1.5; }
.query-support pre { overflow-x: auto; color: #eaf0f6; background: var(--sql-code); font: 12px/1.55 "SFMono-Regular", Consolas, monospace; }

.editor-label { display: block; margin: 19px 0 7px; }
#sql-editor {
  display: block;
  width: 100%;
  min-height: 225px;
  resize: vertical;
  padding: 17px 18px;
  border: 1px solid #273b4c;
  border-radius: 12px;
  color: #edf3f7;
  background: var(--sql-code);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .04);
  font: 13px/1.58 "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  tab-size: 2;
}
.editor-footer { display: flex; justify-content: space-between; gap: 14px; align-items: center; margin-top: 9px; }
.editor-footer p { margin: 0; color: var(--sql-muted); font-size: 10px; }
kbd { padding: 1px 4px; border: 1px solid var(--sql-line); border-bottom-width: 2px; border-radius: 4px; background: #fff; font-size: 9px; }

.result-panel { margin-top: 22px; padding-top: 19px; border-top: 1px solid var(--sql-line); }
.result-heading { display: flex; justify-content: space-between; gap: 18px; align-items: end; }
.result-heading h4 { margin: 5px 0 0; font-size: 17px; }
.results-container {
  min-height: 110px;
  margin-top: 12px;
  overflow-x: auto;
  border: 1px solid var(--sql-line);
  border-radius: 10px;
  background:
    repeating-linear-gradient(-45deg, #fbfaf7, #fbfaf7 12px, #f7f5ef 12px, #f7f5ef 24px);
}
.results-container table { width: 100%; border-collapse: collapse; background: #fff; text-align: left; }
.results-container th,
.results-container td { padding: 9px 11px; border-bottom: 1px solid var(--sql-line-soft); white-space: nowrap; font-size: 12px; }
.results-container th { color: var(--sql-ink); background: var(--sql-soft); font-size: 10px; letter-spacing: .03em; }
.results-container tbody tr:last-child td { border-bottom: 0; }
.results-container tbody tr:hover { background: #fffaf7; }
.empty-result { margin: 0; padding: 20px; color: var(--sql-muted); background: #fff; }
.error-message { margin-top: 12px; padding: 11px 13px; border: 1px solid #e2a5aa; border-radius: 9px; color: #7d1e29; background: #fff1f2; font: 12px/1.5 "SFMono-Regular", Consolas, monospace; white-space: pre-wrap; }

.interpretation-pane { min-width: 0; padding-left: 25px; border-left: 1px solid var(--sql-line); }
.reasoning-block { margin: 0; padding: 18px 0; border-top: 1px solid var(--sql-line); }
.reasoning-block:first-child { padding-top: 0; border-top: 0; }
.reasoning-block .small-label { display: block; margin-bottom: 8px; }
.reasoning-block p { margin: 0; color: var(--sql-copy); font-size: 13px; line-height: 1.58; }
.boundary-block .small-label { color: var(--sql-teal); }
.decision-block .small-label { color: var(--sql-orange); }
.connection-block .small-label { color: var(--sql-violet); }

.review-bar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 22px;
  align-items: center;
  margin-top: 31px;
  padding-top: 20px;
  border-top: 1px solid var(--sql-line);
}
.review-bar p { margin: 5px 0 0; color: var(--sql-ink); font-size: 14px; line-height: 1.5; }
.review-answer { margin-top: 12px; padding: 15px 17px; border: 1px solid var(--sql-line); border-radius: 10px; color: var(--sql-copy); background: var(--sql-soft); font-size: 13px; line-height: 1.55; }
#reveal-button[aria-expanded="true"] { border-color: var(--sql-orange); background: var(--sql-orange-soft); }

.python-companion {
  margin-top: 24px;
  overflow: hidden;
  border: 1px solid var(--sql-line);
  border-radius: var(--sql-radius);
  background: var(--sql-soft);
}
.python-companion > header { display: flex; justify-content: space-between; gap: 20px; align-items: start; padding: 16px 19px; border-bottom: 1px solid var(--sql-line); }
.python-companion h3 { margin: 5px 0 0; color: var(--sql-ink); font-size: 16px; }
.companion-badge { padding: 5px 8px; border-radius: 999px; color: var(--sql-teal); background: var(--sql-teal-soft); font-size: 9px; font-weight: 850; letter-spacing: .1em; }
.python-grid { display: grid; grid-template-columns: minmax(0, 1.18fr) minmax(240px, .82fr); gap: 24px; padding: 17px 19px 19px; }
.python-code { margin: 8px 0 0; padding: 15px; overflow-x: auto; border-radius: 9px; color: #eaf0f6; background: var(--sql-code); font: 11px/1.55 "SFMono-Regular", Consolas, monospace; }
.python-why p { margin: 8px 0 0; color: var(--sql-copy); font-size: 13px; line-height: 1.58; }

.data-ai-footer { margin-top: 0 !important; }

@media (max-width: 1180px) {
  .sql-lab-shell { grid-template-columns: 196px minmax(0, 1fr); }
  .presentation { padding-inline: 27px; }
  .content-layout { grid-template-columns: minmax(0, 1fr) 270px; gap: 26px; }
  .sql-relations-art { right: 200px; opacity: .11; }
}

@media (max-width: 920px) {
  .sql-lab-shell { grid-template-columns: 170px minmax(0, 1fr); }
  .journey { padding-inline: 10px; }
  .content-layout { grid-template-columns: 1fr; }
  .interpretation-pane { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 24px; margin-top: 18px; padding: 18px 0 0; border-left: 0; border-top: 1px solid var(--sql-line); }
  .reasoning-block, .reasoning-block:first-child { padding: 17px 0; border-top: 0; }
  .reasoning-block:nth-child(n+3) { border-top: 1px solid var(--sql-line); }
  .python-grid { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .sql-hero { padding: 24px 20px; }
  .sql-hero__inner { display: block; min-height: 0; }
  .sql-hero h1 { font-size: clamp(34px, 10vw, 46px); }
  .hero-progress { width: min(180px, 100%); margin-top: 18px; }
  .hero-progress strong { font-size: 20px; text-align: left; }
  .sql-relations-art { right: -120px; width: 260px; opacity: .07; }

  .sql-lab-shell { display: block; }
  .journey { padding: 18px; border-right: 0; border-bottom: 1px solid var(--sql-line); }
  .point-navigation, .guide-link { display: none; }
  .compact-stage-picker { display: grid; gap: 6px; margin-top: 12px; }
  .compact-stage-picker label { color: var(--sql-muted); font-size: 9px; font-weight: 850; letter-spacing: .12em; text-transform: uppercase; }
  .compact-stage-picker select { width: 100%; min-height: 44px; padding: 0 34px 0 11px; border: 1px solid var(--sql-line); border-radius: 9px; color: var(--sql-ink); background: #fff; }
  .progress-area { margin-top: 12px; }

  .presentation { padding: 24px 20px 36px; }
  .presentation-header { grid-template-columns: 1fr; }
  .navigation-buttons { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .content-layout { display: block; }
  .experiment-brief { grid-template-columns: 1fr; }
  .editor-footer, .result-heading { align-items: flex-start; flex-direction: column; }
  .interpretation-pane { display: block; }
  .reasoning-block, .reasoning-block:first-child, .reasoning-block:nth-child(n+3) { padding: 17px 0; border-top: 1px solid var(--sql-line); }
  .reasoning-block:first-child { border-top: 0; }
  .review-bar { grid-template-columns: 1fr; }
}

@media (max-width: 500px) {
  .query-actions, .editor-actions { display: grid; grid-template-columns: 1fr; width: 100%; }
  .query-actions button, .editor-actions button, .navigation-buttons button { width: 100%; }
  #sql-editor { min-height: 250px; font-size: 12px; }
  .python-companion > header { display: block; }
  .companion-badge { display: inline-block; margin-top: 10px; }
}

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