/* Signature Agents -- site.css */
/* Design system: tokens, reset, layout, components, responsive */
/* No em-dashes anywhere in this file */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=Geist:wght@400;500;600&display=swap');

/* DESIGN TOKENS */
:root {
  --ground:        #F6F4EF;
  --surface:       #FFFFFF;
  --ink:           #17171A;
  --ink-2:         #3E3C38;
  --muted:         #5E5B55;
  --muted-2:       #8A867E;
  --line:          #E4E0D8;
  --line-soft:     #EEEBE4;
  --line-strong:   #CFCAC0;
  --tile-border:   #DDD8CE;
  --accent:        #1E3A5F;
  --accent-hover:  #142A46;
  --accent-tint:   #E6ECF3;
  --gold:          #C9B99A;
  --on-dark:       #D8D4CB;
  --live:          #2F7D4F;
  --avatar:        #D9D3C7;

  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body:    'Geist', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

/* RESET */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--ground);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
button, input, select, textarea { font: inherit; }
ul, ol { list-style: none; }

/* LAYOUT */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 80px;
}

/* TYPOGRAPHY UTILITIES */
.eyebrow {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 20px;
}
.section-h2 {
  font-family: var(--font-display);
  font-size: 56px;
  line-height: 1.05;
  letter-spacing: -0.8px;
  color: var(--ink);
  margin-bottom: 48px;
}

/* BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 15px 28px;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 500;
  font-family: var(--font-body);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  min-height: 52px;
  white-space: nowrap;
  line-height: 1;
}
.btn-primary { background: var(--accent); color: var(--surface); }
.btn-primary:hover { background: var(--accent-hover); }
.btn-outline { background: transparent; color: var(--ink); border: 1.5px solid var(--line-strong); }
.btn-outline:hover { border-color: var(--ink); }
.btn-white { background: var(--surface); color: var(--ink); }
.btn-white:hover { background: var(--ground); }
.btn-wide { width: 100%; }

/* HEADER */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 88px;
  border-bottom: 1px solid var(--line);
  background: var(--ground);
  transition: background 0.2s ease, backdrop-filter 0.2s ease;
}
.site-header.scrolled {
  background: rgba(246,244,239,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}
.logo-text {
  font-family: var(--font-display);
  font-size: 20px;
}
.nav-desktop {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-desktop a:not(.btn) {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-2);
  text-decoration: none;
  transition: color 0.15s;
}
.nav-desktop a:not(.btn):hover { color: var(--ink); }
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--ink);
  padding: 8px;
  border-radius: 8px;
}
.nav-mobile {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--ground);
  z-index: 200;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 36px;
  padding: 32px;
}
.nav-mobile.open { display: flex; }
.nav-mobile-link {
  font-family: var(--font-display);
  font-size: 36px;
  text-decoration: none;
  color: var(--ink);
}
.nav-mobile .btn { font-family: var(--font-body); font-size: 18px; margin-top: 12px; }
.nav-mobile-close {
  position: absolute;
  top: 24px;
  right: 20px;
  background: none;
  border: none;
  color: var(--ink);
  padding: 8px;
  border-radius: 8px;
}

/* HERO */
.hero { padding: 96px 0 112px; }
.hero-inner {
  display: grid;
  grid-template-columns: 580px 1fr;
  gap: 72px;
  align-items: center;
}
.hero-eyebrow {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 24px;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: 80px;
  line-height: 1.02;
  letter-spacing: -1.5px;
  color: var(--ink);
  margin-bottom: 28px;
}
.hero h1 em { font-style: italic; color: var(--accent); }
.hero-sub {
  font-size: 20px;
  line-height: 1.55;
  color: var(--ink-2);
  max-width: 520px;
  margin-bottom: 36px;
}
.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.status-line {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--muted);
  font-weight: 500;
}
.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--live);
  flex-shrink: 0;
}

/* SLACK MOCK */
.slack-mock {
  background: var(--surface);
  border-radius: 20px;
  box-shadow: 0 24px 60px rgba(23,23,26,0.08);
  border: 1px solid var(--line);
  overflow: hidden;
}
.slack-bar {
  background: var(--ink);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.slack-channel {
  font-size: 13px;
  font-weight: 600;
  color: var(--on-dark);
}
.slack-messages { padding: 20px; display: flex; flex-direction: column; gap: 20px; }
.slack-msg { display: flex; gap: 12px; align-items: flex-start; }
.slack-avatar {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.3px;
}
.slack-avatar.human { background: var(--avatar); color: var(--ink-2); }
.slack-avatar.agent { background: var(--accent); color: var(--surface); }
.slack-msg-content { flex: 1; min-width: 0; }
.slack-meta {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 4px;
  flex-wrap: wrap;
}
.slack-name { font-size: 14px; font-weight: 600; color: var(--ink); }
.slack-badge {
  background: var(--accent-tint);
  color: var(--accent);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.6px;
  padding: 2px 6px;
  border-radius: 4px;
}
.slack-time { font-size: 11px; color: var(--muted-2); }
.slack-text { font-size: 14px; line-height: 1.5; color: var(--ink-2); margin-bottom: 8px; }
.slack-text:last-child { margin-bottom: 0; }
.slack-data {
  background: var(--ground);
  border-radius: 8px;
  padding: 12px 14px;
  margin: 8px 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.slack-data-row {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--ink-2);
}
.slack-data-row strong { font-weight: 600; color: var(--ink); }
.slack-btns { display: flex; gap: 8px; margin-top: 10px; }
.slack-btn {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  border: 1.5px solid transparent;
  pointer-events: none;
}
.slack-btn.primary { background: var(--accent); color: var(--surface); }
.slack-btn.outline { border-color: var(--line-strong); color: var(--ink-2); }

/* HOW IT WORKS */
.how {
  background: var(--surface);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.how-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
}
.how-step { border-top: 2px solid var(--ink); padding-top: 40px; }
.step-num {
  font-family: var(--font-display);
  font-size: 40px;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 20px;
}
.step-title { font-size: 22px; font-weight: 600; color: var(--ink); margin-bottom: 12px; }
.step-body { font-size: 16px; line-height: 1.65; color: var(--ink-2); }

/* USE CASES */
.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.use-case-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 36px 32px;
}
.use-case-icon { color: var(--accent); margin-bottom: 20px; }
.use-case-title { font-size: 22px; font-weight: 600; color: var(--ink); margin-bottom: 8px; }
.use-case-liner { font-size: 15px; color: var(--muted); margin-bottom: 20px; }
.use-case-divider { border: none; border-top: 1px solid var(--line); margin-bottom: 20px; }
.use-case-list { display: flex; flex-direction: column; gap: 10px; }
.use-case-list li {
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink-2);
  padding-left: 18px;
  position: relative;
}
.use-case-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.5;
}
.use-case-list li strong { color: var(--ink); font-weight: 600; }

/* SIGNATURE BAND */
.sig-band { background: var(--ink); padding: 128px 0; }
.sig-band-inner {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 80px;
  align-items: start;
}
.sig-band h2 {
  font-family: var(--font-display);
  font-size: 64px;
  line-height: 1.04;
  color: var(--ground);
  letter-spacing: -0.8px;
  margin-bottom: 28px;
}
.sig-band-body p {
  font-size: 18px;
  line-height: 1.65;
  color: var(--on-dark);
  margin-bottom: 16px;
  max-width: 580px;
}
.sig-band-body p:last-child { margin-bottom: 0; }

/* PRICING */
.pricing-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.pricing-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 40px;
}
.pricing-card.featured { border: 2px solid var(--accent); }
.card-label {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted);
  margin-bottom: 16px;
}
.founding-pill {
  display: inline-flex;
  align-items: center;
  background: var(--accent-tint);
  color: var(--accent);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  padding: 5px 12px;
  border-radius: 999px;
  margin-bottom: 20px;
}
.price-row {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 12px;
}
.price-main {
  font-family: var(--font-display);
  font-size: 80px;
  line-height: 1;
  color: var(--ink);
}
.price-strike { font-size: 24px; color: var(--muted); text-decoration: line-through; }
.card-desc { font-size: 15px; color: var(--muted); line-height: 1.5; margin-bottom: 28px; }
.card-checklist { display: flex; flex-direction: column; gap: 12px; margin-bottom: 32px; }
.card-checklist li { display: flex; align-items: flex-start; gap: 10px; font-size: 15px; color: var(--ink-2); }
.check-icon { color: var(--accent); flex-shrink: 0; margin-top: 2px; }
.maint-rows { margin-bottom: 32px; }
.maint-row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
  gap: 16px;
}
.maint-row:first-child { border-top: 1px solid var(--line-soft); }
.maint-name { font-size: 16px; font-weight: 600; color: var(--ink); }
.maint-sub { font-size: 13px; color: var(--muted); margin-top: 2px; }
.maint-price { font-size: 15px; font-weight: 600; color: var(--ink); white-space: nowrap; }
.card-footnote { font-size: 13px; color: var(--muted); line-height: 1.5; }

/* PROOF */
.proof { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); text-align: center; }
.proof-inner { max-width: 780px; margin: 0 auto; }
.proof-quote { font-family: var(--font-display); font-size: 44px; line-height: 1.15; color: var(--ink); margin-bottom: 28px; font-style: italic; }
.proof-attribution strong { display: block; font-size: 17px; font-weight: 600; color: var(--ink); margin-bottom: 4px; }
.proof-attribution span { font-size: 15px; color: var(--muted); }

/* FAQ */
.faq-inner {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 80px;
  align-items: start;
}
.faq-list { display: flex; flex-direction: column; }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
  gap: 16px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-chevron { width: 20px; height: 20px; color: var(--muted); flex-shrink: 0; transition: transform 0.2s ease; }
.faq-item[open] .faq-chevron { transform: rotate(180deg); }
.faq-answer { padding: 0 40px 22px 0; font-size: 16px; line-height: 1.65; color: var(--ink-2); }

/* CLOSING CTA */
.closing-cta { padding: 112px 0; }
.cta-band {
  background: var(--accent);
  border-radius: 32px;
  padding: 80px;
  text-align: center;
}
.cta-band h2 {
  font-family: var(--font-display);
  font-size: 56px;
  line-height: 1.05;
  color: var(--surface);
  margin-bottom: 32px;
  letter-spacing: -0.8px;
}
.cta-band .btn-white { font-size: 18px; }

/* FOOTER */
.site-footer { border-top: 1px solid var(--line); padding: 44px 0; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 24px; }
.footer-logo { margin-bottom: 8px; }
.footer-legal { font-size: 13px; color: var(--muted); }
.footer-links { display: flex; gap: 28px; }
.footer-links a { font-size: 14px; color: var(--muted); text-decoration: none; transition: color 0.15s; }
.footer-links a:hover { color: var(--ink); }

/* MOTION */
.fade-in { opacity: 0; transform: translateY(12px); transition: opacity 400ms ease-out, transform 400ms ease-out; }
.fade-in.visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .fade-in { opacity: 1; transform: none; transition: none; }
}

/* RESPONSIVE: 1100px */
@media (max-width: 1100px) {
  .container { padding: 0 48px; }
  .hero-inner { grid-template-columns: 1fr 1fr; gap: 48px; }
  .hero h1 { font-size: 64px; }
  .section-h2 { font-size: 44px; }
  .sig-band h2 { font-size: 52px; }
}

/* RESPONSIVE: 900px */
@media (max-width: 900px) {
  .container { padding: 0 32px; }
  .nav-desktop { display: none; }
  .nav-toggle { display: flex; }
  .hero-inner { grid-template-columns: 1fr; }
  .slack-mock { max-width: 480px; }
  .how-steps { grid-template-columns: 1fr; gap: 32px; }
  .use-cases-grid { grid-template-columns: 1fr 1fr; }
  .sig-band-inner { grid-template-columns: 1fr; gap: 40px; }
  .sig-band h2 { font-size: 44px; }
  .pricing-cards { grid-template-columns: 1fr; }
  .faq-inner { grid-template-columns: 1fr; gap: 40px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}

/* RESPONSIVE: 640px */
@media (max-width: 640px) {
  .container { padding: 0 16px; }
  section { padding: 72px 0; }
  .site-header { height: 64px; }
  .hero { padding: 64px 0 72px; }
  .hero h1 { font-size: 48px; letter-spacing: -0.8px; }
  .hero-sub { font-size: 17px; }
  .hero-eyebrow { font-size: 12px; }
  .section-h2 { font-size: 36px; letter-spacing: -0.4px; }
  .sig-band { padding: 72px 0; }
  .sig-band h2 { font-size: 40px; }
  .price-main { font-size: 64px; }
  .proof-quote { font-size: 32px; }
  .use-cases-grid { grid-template-columns: 1fr; }
  .cta-band { padding: 52px 28px; border-radius: 20px; }
  .cta-band h2 { font-size: 36px; }
  .step-num { font-size: 32px; }
  .faq-item summary { font-size: 16px; }
}