/* Agent Hub landing — Keel & Straits on top of the design tokens.
   Structure from 1px lines, ink and white surfaces, signal accents. */

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--ks-font-body, system-ui, sans-serif);
  color: var(--ks-ink, #0D1013);
  background: var(--ks-page, #fff);
  line-height: 1.6;
}
h1, h2, h3, h4 { font-family: var(--ks-font-display, inherit); line-height: 1.15; margin: 0; }
a { color: inherit; }

/* Buttons: the K&S button, carried onto anchors and dark surfaces.
   The system styles <button>; the landing links must not underline, and a
   primary button on the ink hero inverts (bone on ink) or it disappears. */
a.ks-btn { text-decoration: none; }
.ks-btn--lg { height: auto; padding: 14px 28px; font-size: 15px; }
.ks-btn--ghost { background: transparent; color: inherit; border: 1px solid currentColor; }
.ld-hero .ks-btn:not(.ks-btn--ghost),
.ld-final .ks-btn:not(.ks-btn--ghost) {
  background: var(--ks-bone, #F0EEEA);
  color: var(--ks-ink, #0D1013);
  border-color: var(--ks-bone, #F0EEEA);
}
.ld-hero .ks-btn:not(.ks-btn--ghost):hover,
.ld-final .ks-btn:not(.ks-btn--ghost):hover { background: #fff; border-color: #fff; }

/* Header */
.ld-header {
  display: flex; align-items: center; gap: 28px;
  padding: 0 32px; height: 64px;
  position: sticky; top: 0; z-index: 50;
  background: var(--ks-page, #fff);
  border-bottom: 1px solid var(--ks-line, #E3E1DC);
}
.ld-nav { display: flex; gap: 22px; margin-left: 12px; font-size: 14px; }
.ld-nav a { text-decoration: none; color: var(--ks-graphite, #55585C); }
.ld-nav a:hover { color: var(--ks-ink); }
.ld-header-cta { margin-left: auto; display: flex; gap: 10px; align-items: center; }

/* Hero: ink surface, inverted */
.ld-hero {
  display: grid; grid-template-columns: minmax(320px, 1.05fr) 1fr; gap: 48px;
  align-items: center;
  background: var(--ks-ink, #0D1013); color: var(--ks-bone, #F0EEEA);
  padding: 88px 64px;
}
.ld-hero h1 { font-size: clamp(34px, 4.6vw, 58px); letter-spacing: -0.03em; font-weight: 700; }
.ld-hero__sub { font-size: 17px; color: var(--ks-concrete, #A3A5A7); max-width: 56ch; margin: 22px 0 30px; }
.ld-hero__ctas { display: flex; gap: 14px; flex-wrap: wrap; }
.ld-hero .ks-btn--ghost { color: var(--ks-bone); }
.ld-hero__note { margin-top: 18px; font-family: var(--ks-font-mono, monospace); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ks-concrete); }
.ld-hero__visual { min-width: 0; }
.ld-hero__visual .mock-scope { max-width: 640px; margin-left: auto; }

/* Proof strip */
.ld-proof {
  display: flex; gap: 12px; align-items: baseline; justify-content: center; flex-wrap: wrap;
  padding: 18px 24px; border-bottom: 1px solid var(--ks-line);
  font-size: 13px; color: var(--ks-graphite);
}
.ld-proof strong { font-family: var(--ks-font-display); letter-spacing: 0.02em; color: var(--ks-ink); }
.ld-proof__sep { color: var(--ks-concrete); }

/* Sections */
.ld-section { padding: 84px 64px; max-width: 1280px; margin: 0 auto; }
.ld-section--tint { max-width: none; background: var(--ks-page); border-top: 1px solid var(--ks-line); border-bottom: 1px solid var(--ks-line); }
.ld-section--tint > * { max-width: 1152px; margin-left: auto; margin-right: auto; }
.ld-h2 { font-size: clamp(26px, 3vw, 38px); letter-spacing: -0.02em; margin-bottom: 40px; }
.ld-lead { max-width: 70ch; font-size: 16px; color: var(--ks-graphite); margin: -22px 0 32px; }

/* Pillars */
.ld-pillars { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 0; border: 1px solid var(--ks-line); }
.ld-pillar { padding: 32px 28px; border-right: 1px solid var(--ks-line); }
.ld-pillar:last-child { border-right: 0; }
.ld-pillar__num { font-family: var(--ks-font-mono, monospace); color: var(--ks-signal, #EC6100); font-size: 12px; letter-spacing: 0.15em; margin-bottom: 14px; }
.ld-pillar h3 { font-size: 19px; margin-bottom: 12px; }
.ld-pillar p { font-size: 14.5px; color: var(--ks-graphite); margin: 0; }

/* Feature grid */
.ld-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 16px; }
.ld-card { background: var(--ks-surface, #fff); border: 1px solid var(--ks-line); padding: 22px 20px; }
.ld-card h4 { font-size: 15px; margin-bottom: 8px; }
.ld-card p { font-size: 13.5px; color: var(--ks-graphite); margin: 0; }

/* Try it */
.ld-try { border: 1px solid var(--ks-ink); }
.ld-try__form { padding: 28px; display: flex; flex-direction: column; gap: 8px; max-width: 720px; }
.ld-try__form label { font-family: var(--ks-font-mono, monospace); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ks-graphite); margin-top: 10px; }
.ld-try__form input, .ld-try__form textarea {
  border: 1px solid var(--ks-line); padding: 12px 14px; font-size: 14px; font-family: inherit;
  background: var(--ks-surface); resize: vertical;
}
.ld-try__form input:focus, .ld-try__form textarea:focus { outline: none; border-color: var(--ks-ink); }
.ld-try__form .ks-btn { align-self: flex-start; margin-top: 14px; }
.ld-try__hint { font-size: 12px; color: var(--ks-graphite); }
.ld-try__chat { border-top: 1px solid var(--ks-line); padding: 24px 28px; display: flex; flex-direction: column; gap: 12px; max-height: 480px; overflow-y: auto; }
.ld-msg { max-width: 78%; padding: 10px 14px; font-size: 14px; line-height: 1.5; border: 1px solid var(--ks-line); background: var(--ks-surface); }
.ld-msg--user { align-self: flex-end; background: var(--ks-ink); color: var(--ks-bone); border-color: var(--ks-ink); }
.ld-msg--thinking { color: var(--ks-graphite); font-size: 13px; border: 0; padding: 4px 0; }
.ld-try__composer { display: flex; gap: 10px; margin-top: 4px; }
.ld-try__composer input { flex: 1; border: 1px solid var(--ks-line); padding: 10px 14px; font-size: 14px; font-family: inherit; }

/* ROI */
.ld-roi { display: grid; grid-template-columns: 1.2fr 1fr; gap: 16px; align-items: start; }
.ld-roi__case, .ld-roi__calc { background: var(--ks-surface); border: 1px solid var(--ks-line); padding: 26px; }
.ld-roi__case h4, .ld-roi__calc h4 { font-size: 16px; margin-bottom: 12px; }
.ld-roi__case p { font-size: 14.5px; color: var(--ks-graphite); }
.ld-roi__fine { font-size: 12px !important; }
.ld-roi__calc label { display: flex; justify-content: space-between; align-items: center; gap: 12px; font-size: 13.5px; margin-bottom: 10px; }
.ld-roi__calc input { width: 100px; border: 1px solid var(--ks-line); padding: 8px 10px; font-size: 14px; font-family: inherit; }
.ld-roi__result { border-top: 1px solid var(--ks-line); margin-top: 14px; padding-top: 14px; font-size: 14px; }
.ld-roi__result strong { font-size: 22px; display: block; letter-spacing: -0.02em; }

/* Pricing */
.ld-tiers { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; align-items: stretch; }
.ld-tier { border: 1px solid var(--ks-line); padding: 30px 26px; display: flex; flex-direction: column; background: var(--ks-surface); position: relative; }
.ld-tier--hi { border: 1px solid var(--ks-ink); }
.ld-tier__badge { position: absolute; top: -1px; right: -1px; background: var(--ks-ink); color: var(--ks-bone); font-family: var(--ks-font-mono, monospace); font-size: 10px; letter-spacing: 0.12em; text-transform: uppercase; padding: 5px 10px; }
.ld-tier h3 { font-size: 17px; }
.ld-tier__price { font-size: 34px; font-weight: 700; letter-spacing: -0.03em; margin: 12px 0 18px; font-family: var(--ks-font-display); }
.ld-tier__price span { font-size: 14px; font-weight: 400; color: var(--ks-graphite); letter-spacing: 0; }
.ld-tier ul { list-style: none; padding: 0; margin: 0 0 24px; font-size: 13.5px; color: var(--ks-graphite); flex: 1; }
.ld-tier li { padding: 6px 0; border-bottom: 1px solid var(--ks-line); }
.ld-tier .ks-btn { text-align: center; }
.ld-pricing-note { margin-top: 22px; font-size: 13px; color: var(--ks-graphite); max-width: 80ch; }

/* Integrations */
.ld-int { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.ld-int__item { border: 1px solid var(--ks-line); background: var(--ks-surface); padding: 22px 20px; }
.ld-int__item h4 { font-size: 15px; margin-bottom: 8px; }
.ld-int__item p { font-size: 13.5px; color: var(--ks-graphite); margin: 0; }
.ld-int__note { margin-top: 20px; font-size: 13px; color: var(--ks-graphite); }

/* FAQ */
.ld-faq details { border: 1px solid var(--ks-line); border-bottom: 0; background: var(--ks-surface); }
.ld-faq details:last-child { border-bottom: 1px solid var(--ks-line); }
.ld-faq summary { cursor: pointer; padding: 16px 20px; font-weight: 600; font-size: 14.5px; list-style: none; }
.ld-faq summary::-webkit-details-marker { display: none; }
.ld-faq summary::before { content: "+"; font-family: var(--ks-font-mono, monospace); color: var(--ks-signal); margin-right: 12px; }
.ld-faq details[open] summary::before { content: "–"; }
.ld-faq p { padding: 0 20px 16px 44px; margin: 0; font-size: 14px; color: var(--ks-graphite); }

/* Final CTA */
.ld-final { background: var(--ks-ink); color: var(--ks-bone); text-align: center; padding: 80px 32px; }
.ld-final h2 { font-size: clamp(24px, 3vw, 36px); letter-spacing: -0.02em; margin-bottom: 28px; }

/* Footer */
.ld-footer { display: flex; gap: 22px; justify-content: center; padding: 26px; font-size: 13px; color: var(--ks-graphite); border-top: 1px solid var(--ks-line); }
.ld-footer a { color: inherit; }

/* Responsive */
@media (max-width: 960px) {
  .ld-hero { grid-template-columns: 1fr; padding: 56px 24px; }
  .ld-hero__visual .mock-scope { margin: 0 auto; }
  .ld-section { padding: 56px 24px; }
  .ld-roi { grid-template-columns: 1fr; }
  .ld-nav { display: none; }
  .ld-header { padding: 0 16px; }
}

/* Proposal modal */
.ld-modal-overlay {
  position: fixed; inset: 0; background: rgba(13, 16, 19, 0.55);
  display: flex; align-items: center; justify-content: center; z-index: 100; padding: 24px;
}
.ld-modal {
  background: var(--ks-surface, #fff); border: 1px solid var(--ks-ink);
  max-width: 720px; width: 100%; max-height: 88vh; overflow-y: auto;
  padding: 34px 36px; position: relative;
}
.ld-modal__close { position: absolute; top: 12px; right: 14px; border: 0; background: none; font-size: 26px; cursor: pointer; color: var(--ks-graphite); }
.ld-modal h3 { font-size: 24px; letter-spacing: -0.02em; margin-bottom: 8px; }
.ld-modal__sub { color: var(--ks-graphite); font-size: 14.5px; margin: 0 0 10px; }
.ld-modal__section { font-family: var(--ks-font-mono, monospace); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ks-signal); margin: 22px 0 10px; }
.ld-modal__agents { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 10px; }
.ld-modal__agent { border: 1px solid var(--ks-line); padding: 14px 16px; }
.ld-modal__agent h4 { font-size: 14px; margin-bottom: 6px; }
.ld-modal__agent p { font-size: 12.5px; color: var(--ks-graphite); margin: 0; }
.ld-modal__list { margin: 0; padding-left: 20px; font-size: 13.5px; color: var(--ks-graphite); }
.ld-modal__list li { padding: 2px 0; }
.ld-modal__cta { border-top: 1px solid var(--ks-line); margin-top: 26px; padding-top: 22px; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.ld-modal__cta span { font-size: 12.5px; color: var(--ks-graphite); max-width: 34ch; }