:root {
  --color-canvas: #f7f8f5;
  --color-surface: #ffffff;
  --color-ink: #172626;
  --color-muted: #586969;
  --color-brand: #126b60;
  --color-brand-ink: #ffffff;
  --color-border: #dce5df;
  --color-danger: #a82f3b;
  --color-warning: #845500;
  --radius-control: 10px;
  --radius-panel: 16px;
  --space-unit: 4px;
  --font-body: "Source Sans 3", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-display: "Fraunces", Georgia, serif;
}
* { box-sizing: border-box; }
html { color-scheme: light; }
body {
  margin: 0; background: var(--color-canvas); color: var(--color-ink);
  font-family: var(--font-body); font-size: 17px; line-height: 1.5;
}
h1, h2, h3 { font-family: var(--font-display); font-weight: 600; line-height: 1.15; margin: 0 0 calc(var(--space-unit) * 4); }
h1 { font-size: clamp(2rem, 5vw, 3.25rem); letter-spacing: -0.01em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.125rem); }
h3 { font-size: 1.2rem; }
p { margin: 0 0 calc(var(--space-unit) * 4); }
a { color: var(--color-brand); }
.skip { position: absolute; left: -999px; top: 0; background: var(--color-surface); padding: 8px 12px; }
.skip:focus { left: 8px; z-index: 10; }
:focus-visible { outline: 3px solid var(--color-brand); outline-offset: 2px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 44px; padding: 10px 20px; border-radius: var(--radius-control);
  font-weight: 600; text-decoration: none; border: 1px solid transparent; cursor: pointer;
  font-family: inherit; font-size: 1rem;
}
.btn-primary { background: var(--color-brand); color: var(--color-brand-ink); }
.btn-primary:hover { background: #0e564d; }
.btn-secondary { background: var(--color-surface); color: var(--color-ink); border-color: var(--color-border); }

.site-header {
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  padding: 16px clamp(16px, 5vw, 64px); border-bottom: 1px solid var(--color-border); background: var(--color-surface);
}
.site-header nav { display: flex; gap: 20px; align-items: center; flex-wrap: wrap; }
.site-header nav a { color: var(--color-ink); text-decoration: none; min-height: 44px; display: inline-flex; align-items: center; }
.wordmark { font-family: var(--font-display); font-weight: 700; font-size: 1.5rem; color: var(--color-ink); text-decoration: none; }

main { padding: 0 clamp(16px, 5vw, 64px); }
section { padding: clamp(40px, 8vw, 96px) 0; border-bottom: 1px solid var(--color-border); }

.hero { display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(24px, 5vw, 64px); align-items: center; }
.hero-copy p { font-size: 1.15rem; color: var(--color-muted); max-width: 34rem; }
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.fineprint { font-size: 0.9rem; color: var(--color-muted); }
.hero-demo { margin: 0; background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-panel); padding: 20px; }
.sample-label { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--color-muted); margin-bottom: 12px; }
.bubble { padding: 10px 14px; border-radius: 14px; max-width: 90%; margin-bottom: 8px; }
.bubble.customer { background: #eef2ef; }
.bubble.assistant { background: var(--color-brand); color: var(--color-brand-ink); margin-left: auto; }
.demo-chat { border-top: 1px dashed var(--color-border); margin-top: 16px; padding-top: 16px; font-size: 0.95rem; }
.chat-line { background: #eef2ef; border-radius: 12px; padding: 10px 14px; margin-bottom: 8px; }
.chat-line.owner { background: var(--color-canvas); border: 1px solid var(--color-border); text-align: right; }

.steps ol { list-style: none; counter-reset: step; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.steps li { counter-increment: step; background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-panel); padding: 24px; }
.steps li::before { content: counter(step); display: inline-grid; place-items: center; width: 36px; height: 36px; border-radius: 50%; background: var(--color-brand); color: var(--color-brand-ink); font-weight: 700; margin-bottom: 12px; }
.feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.feature-grid article { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-panel); padding: 24px; }
.faq dt { font-weight: 600; margin-top: 16px; }
.faq dd { margin: 4px 0 0; color: var(--color-muted); }
.closing { text-align: center; border-bottom: 0; }
.site-footer { padding: 24px clamp(16px, 5vw, 64px); color: var(--color-muted); font-size: 0.9rem; }

.app-bg { display: grid; place-items: center; min-height: 100vh; padding: 16px; }
.auth-card { width: 100%; max-width: 420px; background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-panel); padding: 32px; }
.auth-card label { display: block; font-weight: 600; margin-bottom: 6px; }
.auth-card input { width: 100%; min-height: 44px; padding: 10px 12px; border: 1px solid var(--color-border); border-radius: var(--radius-control); font: inherit; margin-bottom: 16px; }

@media (max-width: 900px) {
  .hero, .steps ol, .feature-grid { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

.alert { padding: 10px 14px; border-radius: var(--radius-control); border: 1px solid var(--color-border); margin-bottom: 16px; }
.alert-error { border-color: var(--color-danger); color: var(--color-danger); background: #fbeef0; }
.alert-warning { border-color: var(--color-warning); color: var(--color-warning); background: #fff6e5; }
.alert-debug { border-color: var(--color-brand); background: #e8f3f1; }
.alert code { font-size: 1.3rem; letter-spacing: 0.15em; font-weight: 700; }
.auth-card select { width: 100%; min-height: 44px; padding: 10px 12px; border: 1px solid var(--color-border); border-radius: var(--radius-control); font: inherit; margin-bottom: 16px; background: var(--color-surface); }
.app-shell { display: block; }
.app-main { padding: 32px clamp(16px, 5vw, 64px); }
.muted { color: var(--color-muted); }
.status { text-transform: capitalize; }