:root {
  --ink: #17333b;
  --muted: #557077;
  --teal: #096b72;
  --teal-bright: #15a3a3;
  --mint: #eaf7f5;
  --dark: #0d3b49;
  --line: #cfe2df;
  --white: #ffffff;
  --shadow: 0 16px 45px rgba(13, 59, 73, .10);
  --max: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}
a { color: inherit; }
.site-header {
  align-items: center;
  background: rgba(255, 255, 255, .92);
  border-bottom: 1px solid rgba(207, 226, 223, .8);
  display: flex;
  justify-content: space-between;
  padding: 1rem max(1.25rem, calc((100vw - var(--max)) / 2));
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(16px);
}
.brand, nav { align-items: center; display: flex; gap: 1.2rem; }
.brand { font-weight: 800; text-decoration: none; letter-spacing: -.02em; }
.brand-mark { color: var(--teal-bright); font-size: 1.4rem; }
nav a, .site-footer a { color: var(--muted); font-size: .9rem; text-decoration: none; }
nav a:hover, .site-footer a:hover, .text-link:hover { color: var(--teal); }
.slide-section {
  margin: 0 auto;
  max-width: var(--max);
  padding: 7.5rem 1.25rem;
  scroll-margin-top: 4.5rem;
}
.hero {
  max-width: none;
  min-height: 87vh;
  overflow: hidden;
  padding: 12rem max(1.25rem, calc((100vw - var(--max)) / 2)) 8rem;
  position: relative;
  background: var(--mint);
}
.hero-accent { background: var(--teal); height: 100%; left: 0; position: absolute; top: 0; width: .45rem; }
.eyebrow { color: var(--teal); font-size: .78rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
.dark-section .eyebrow { color: #9ee6dd; }
h1, h2, h3, p { margin-top: 0; }
h1 { color: var(--dark); font-size: clamp(3rem, 8vw, 6.5rem); letter-spacing: -.075em; line-height: .98; margin: 1.2rem 0 2rem; max-width: 950px; }
h1 span { color: var(--teal); }
h2 { color: var(--dark); font-size: clamp(2.1rem, 4vw, 3.6rem); letter-spacing: -.055em; line-height: 1.05; margin: .75rem 0 1.5rem; }
h3 { font-size: 1.05rem; margin-bottom: .35rem; }
p { color: var(--muted); }
.hero-lede { font-size: clamp(1.1rem, 2vw, 1.4rem); max-width: 680px; }
.hero-note { font-size: .9rem; margin-top: 3rem; max-width: 580px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2rem; }
.button { border-radius: 999px; display: inline-block; font-weight: 750; padding: .8rem 1.25rem; text-decoration: none; }
.button-primary { background: var(--teal); color: var(--white); }
.button-primary:hover { background: var(--dark); }
.button-secondary { border: 1px solid var(--teal); color: var(--teal); }
.button-secondary:hover { background: var(--white); }
.split-section { align-items: center; display: grid; gap: 5rem; grid-template-columns: 1.15fr .85fr; }
.split-section > div:first-child p { font-size: 1.25rem; max-width: 650px; }
.callout-card { background: var(--mint); border-left: .35rem solid var(--teal-bright); box-shadow: var(--shadow); padding: 2.5rem; }
.quote { color: var(--dark); font-size: 1.65rem; font-weight: 800; letter-spacing: -.04em; }
.agenda-grid, .pattern-grid, .workflow, .trust-grid { display: grid; gap: 1rem; }
.agenda-grid { grid-template-columns: repeat(3, 1fr); margin-top: 3rem; }
.agenda-grid article { border-top: 2px solid var(--teal-bright); padding: 1.3rem 0; }
.agenda-grid span { color: var(--teal-bright); font-weight: 850; }
.agenda-grid h3 { margin-top: 1.4rem; }
.tinted-section { max-width: none; padding-left: max(1.25rem, calc((100vw - var(--max)) / 2)); padding-right: max(1.25rem, calc((100vw - var(--max)) / 2)); background: var(--mint); }
.pattern-grid { grid-template-columns: repeat(5, 1fr); margin-top: 3rem; }
.pattern-card { background: var(--white); box-shadow: var(--shadow); min-height: 210px; padding: 1.5rem; }
.pattern-card strong { color: var(--teal); font-size: 1.15rem; }
.surface-list { margin-top: 2.5rem; max-width: 820px; }
.surface-row { align-items: center; border-bottom: 1px solid var(--line); display: flex; gap: 1.5rem; padding: 1.35rem 0; }
.surface-row p { margin-bottom: 0; }
.surface-icon { align-items: center; background: var(--mint); color: var(--teal); display: flex; flex: 0 0 3.2rem; font-weight: 850; height: 3.2rem; justify-content: center; }
.dark-section { background: var(--dark); color: var(--white); max-width: none; padding-left: max(1.25rem, calc((100vw - var(--max)) / 2)); padding-right: max(1.25rem, calc((100vw - var(--max)) / 2)); }
.dark-section h2 { color: var(--white); }
.dark-lede { color: #c9f4ee; font-size: 1.25rem; }
.prompt-grid, .trust-grid { grid-template-columns: repeat(4, 1fr); margin-top: 3.5rem; }
.prompt-grid div, .trust-grid div { border-left: 1px solid rgba(201, 244, 238, .45); padding: 0 1.2rem; }
.prompt-grid span, .trust-grid span { color: #9ee6dd; font-size: 1.2rem; font-weight: 850; }
.prompt-grid p, .trust-grid p { color: #c9f4ee; margin-top: .7rem; }
.comparison { display: grid; gap: 1.2rem; grid-template-columns: 1fr 1.5fr; margin-top: 2.5rem; }
.comparison-card { min-height: 270px; padding: 2rem; }
.comparison-card.weak { background: #f3f7f6; }
.comparison-card.strong { background: var(--mint); border-left: .35rem solid var(--teal-bright); }
.label { color: var(--teal); font-size: .78rem; font-weight: 850; letter-spacing: .12em; text-transform: uppercase; }
.comparison-card p { color: var(--ink); margin-top: 1rem; }
.comparison-card small { color: var(--muted); display: block; margin-top: 2rem; }
.section-intro { font-size: 1.15rem; max-width: 760px; }
.workflow { grid-template-columns: repeat(4, 1fr); margin: 3rem 0 2rem; }
.workflow div { background: var(--white); border-top: 3px solid var(--teal-bright); box-shadow: var(--shadow); padding: 1.5rem; }
.workflow b { color: var(--teal-bright); font-size: 1.4rem; }
.text-link { color: var(--teal); font-weight: 800; text-decoration: none; }
.steps { display: grid; gap: .8rem; grid-template-columns: repeat(2, 1fr); margin-top: 2.5rem; max-width: 760px; }
.steps span { align-items: center; border-bottom: 1px solid var(--line); display: flex; gap: 1rem; padding: 1rem 0; }
.steps b { align-items: center; background: var(--mint); border-radius: 50%; color: var(--teal); display: flex; height: 2rem; justify-content: center; width: 2rem; }
.warning { color: #9ee6dd; font-size: 1.1rem; font-weight: 750; margin-top: 3rem; }
.experiment-section { text-align: center; }
.experiment-section > p { font-size: 1.2rem; margin: 0 auto 2rem; max-width: 700px; }
.experiment-card { background: var(--mint); margin: 2rem auto 2.5rem; max-width: 760px; padding: 1rem 2rem; text-align: left; }
.experiment-card label { border-bottom: 1px solid var(--line); display: flex; justify-content: space-between; gap: 1rem; padding: 1rem 0; }
.experiment-card span { color: var(--muted); font-size: .92rem; }
.events-grid { display: grid; gap: 1rem; grid-template-columns: repeat(2, 1fr); margin-top: 3rem; }
.event-card { background: var(--white); border-top: 3px solid var(--teal-bright); box-shadow: var(--shadow); display: flex; flex-direction: column; padding: 1.75rem; }
.event-date { color: var(--teal-bright); font-size: .82rem; font-weight: 850; letter-spacing: .1em; text-transform: uppercase; }
.event-card h3 { margin: .8rem 0 .6rem; }
.event-card p { color: var(--muted); flex: 1; }
.event-card .text-link { margin-top: 1.2rem; }
.events-note { color: var(--muted); font-size: .92rem; margin-top: 2rem; }
.closing { background: var(--dark); color: var(--white); max-width: none; text-align: center; }.closing h2 { color: var(--white); font-size: clamp(2.5rem, 6vw, 5.5rem); margin: 1.5rem auto 2rem; }
.closing p { color: #c9f4ee; font-size: 1.2rem; }
.site-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin: 0 auto;
  max-width: var(--max);
  padding: 2rem 1.25rem;
}

.repo-link {
  color: var(--teal);
  font-weight: 800;
  text-decoration: none;
}

.repo-link:hover { color: var(--dark); }

@media (max-width: 800px) {
  nav { display: none; }
  .slide-section, .hero { padding-bottom: 5rem; padding-top: 5rem; }
  .split-section, .comparison { grid-template-columns: 1fr; gap: 2rem; }
  .agenda-grid, .pattern-grid, .workflow, .prompt-grid, .trust-grid { grid-template-columns: 1fr 1fr; }
  .pattern-card { min-height: auto; }
  .steps { grid-template-columns: 1fr; }
  .experiment-card label { align-items: flex-start; flex-direction: column; gap: .25rem; }
}
@media (max-width: 520px) {
  h1 { font-size: 3.25rem; }
  .agenda-grid, .pattern-grid, .workflow, .prompt-grid, .trust-grid, .events-grid { grid-template-columns: 1fr; }
  .site-footer { flex-direction: column; gap: .5rem; }
}