/* ============================================================
   AI Partners — ai-p.ai
   Brand: calm command over business AI.
   Light neutral field, graphite type, single cobalt accent.
   ============================================================ */

:root {
  --bg: #f7f7f4;
  --surface: #ffffff;
  --ink: #15171c;
  --ink-2: #4b5160;
  --ink-3: #878d99;
  --line: #e7e7e1;
  --accent: #2743d3;
  --accent-ink: #1e33a6;
  --accent-soft: #edf0fe;
  --good: #1e8e5a;
  --good-soft: #e8f4ee;
  --warn-soft: #fbf0dd;
  --warn-ink: #9a5b07;
  --radius: 14px;
  --radius-lg: 20px;
  --shadow: 0 1px 2px rgba(21, 23, 28, 0.05), 0 12px 32px rgba(21, 23, 28, 0.07);
  --maxw: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--ink);
  font-size: 16.5px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  margin: 0 0 0.5em;
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 650;
}
h1 { font-size: clamp(2.5rem, 5.2vw, 3.7rem); letter-spacing: -0.035em; }
h2 { font-size: clamp(1.7rem, 3.2vw, 2.35rem); letter-spacing: -0.03em; }
h3 { font-size: 1.13rem; }
p { margin: 0 0 1em; }
a { color: var(--accent); text-decoration: none; }
img { max-width: 100%; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 10px;
  padding: 12px 22px;
  font-weight: 600;
  font-size: 0.98rem;
  font-family: inherit;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 1px 2px rgba(21, 23, 28, 0.12); }
.btn-primary:hover { background: var(--accent-ink); }
.btn-primary:disabled { opacity: 0.6; cursor: default; }
.btn-ghost { border-color: var(--line); color: var(--ink); background: var(--surface); }
.btn-ghost:hover { border-color: #cfcfc7; }
.btn-ghost-dark { border-color: rgba(255, 255, 255, 0.3); color: #fff; background: transparent; }
.btn-ghost-dark:hover { border-color: rgba(255, 255, 255, 0.6); }
.btn-sm { padding: 9px 16px; font-size: 0.9rem; }

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 247, 244, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: inline-flex;
  align-items: center;
  font-weight: 700;
  color: var(--ink);
  font-size: 1.06rem;
  letter-spacing: -0.02em;
}
.brand-mark { flex: none; margin-right: 9px; display: block; }
.nav-links { display: flex; align-items: center; gap: 26px; }
.nav-links a { color: var(--ink-2); font-weight: 500; font-size: 0.95rem; }
.nav-links a:hover { color: var(--ink); }
.nav-links .btn { color: #fff; }
.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 8px;
  width: 38px;
  height: 36px;
  cursor: pointer;
  font-size: 1.1rem;
  color: var(--ink);
}

/* ---------- Hero ---------- */
.hero { padding: 88px 24px 96px; }
.hero-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.74rem;
  font-weight: 650;
  color: var(--ink-3);
  margin-bottom: 18px;
}
.lede { font-size: 1.16rem; color: var(--ink-2); max-width: 34em; }
.cta-row { display: flex; gap: 12px; margin: 26px 0 12px; flex-wrap: wrap; }
.cta-note { font-size: 0.9rem; color: var(--ink-3); }

/* ---------- Product frame (hero + governance mocks) ---------- */
.app-frame {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.app-frame-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 11px 14px;
  border-bottom: 1px solid var(--line);
}
.app-frame-bar span { width: 9px; height: 9px; border-radius: 50%; background: #e3e3dc; }
.app-frame-bar em { margin-left: 10px; font-style: normal; font-size: 0.78rem; color: var(--ink-3); font-weight: 550; }
.app-frame-body { display: grid; grid-template-columns: 1.5fr 1fr; }
.feed { padding: 10px; display: flex; flex-direction: column; gap: 6px; border-right: 1px solid var(--line); }
.feed-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fcfcfa;
}
.feed-dot { flex: none; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
.feed-dot.good { background: var(--good); }
.feed-dot.hold { background: #d97706; }
.feed-text { flex: 1; min-width: 0; }
.feed-text strong { display: block; font-size: 0.82rem; letter-spacing: -0.01em; }
.feed-text small { color: var(--ink-3); font-size: 0.72rem; }
.chip {
  font-size: 0.68rem;
  font-weight: 650;
  padding: 4px 9px;
  border-radius: 99px;
  white-space: nowrap;
}
.chip-review { background: var(--accent-soft); color: var(--accent-ink); }
.chip-done { background: var(--good-soft); color: #176a45; }
.chip-hold { background: var(--warn-soft); color: var(--warn-ink); }
.panel { padding: 16px; display: flex; flex-direction: column; gap: 16px; background: var(--surface); }
.panel h4 {
  margin: 0;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  font-weight: 650;
}
.stat strong { font-size: 1.45rem; letter-spacing: -0.02em; display: block; }
.stat small { color: var(--ink-3); font-size: 0.78rem; }
.cap-head { display: flex; justify-content: space-between; font-size: 0.75rem; color: var(--ink-2); margin-bottom: 6px; }
.cap-bar { height: 6px; border-radius: 99px; background: #efefe9; overflow: hidden; }
.cap-bar i { display: block; height: 100%; background: var(--accent); border-radius: 99px; }
.pill-note {
  font-size: 0.76rem;
  color: var(--accent-ink);
  background: var(--accent-soft);
  border-radius: 99px;
  padding: 6px 12px;
  align-self: flex-start;
  font-weight: 550;
}

/* governance mock rows */
.gov-rows { display: flex; flex-direction: column; gap: 8px; padding: 14px; }
.gov-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  background: #fcfcfa;
}
.gov-row strong { font-size: 0.84rem; display: block; }
.gov-row small { color: var(--ink-3); font-size: 0.72rem; }
.gov-toggle {
  flex: none;
  width: 34px;
  height: 20px;
  border-radius: 99px;
  background: var(--accent);
  position: relative;
}
.gov-toggle::after {
  content: '';
  position: absolute;
  top: 2px;
  right: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
}
.gov-toggle.off { background: #d8d8d0; }
.gov-toggle.off::after { right: auto; left: 2px; }

/* ---------- Sections ---------- */
.section { padding: 84px 24px; }
.section-inner { max-width: var(--maxw); margin: 0 auto; }
.section-lede { font-size: 1.1rem; color: var(--ink-2); max-width: 46em; }
.band { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 36px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 36px; }
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: 0 1px 2px rgba(21, 23, 28, 0.04);
}
.band .card { background: var(--bg); box-shadow: none; }
.card h3 { margin-bottom: 0.4em; }
.card p { color: var(--ink-2); font-size: 0.95rem; margin: 0; }
.module-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent-ink);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.gov-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.checklist { list-style: none; padding: 0; margin: 24px 0 0; display: flex; flex-direction: column; gap: 14px; }
.checklist li { display: flex; gap: 12px; color: var(--ink-2); font-size: 0.97rem; }
.checklist li strong { color: var(--ink); }
.check {
  flex: none;
  width: 22px;
  height: 22px;
  margin-top: 2px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-ink);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
}

.stats-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 36px; }
.stat-card strong { font-size: 2.3rem; letter-spacing: -0.03em; display: block; margin-bottom: 4px; }
.stat-card span { color: var(--ink-2); font-size: 0.93rem; }
.footnote { font-size: 0.8rem; color: var(--ink-3); margin-top: 18px; max-width: 52em; }

.usecase-grid { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; }
.usecase {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 99px;
  padding: 10px 18px;
  font-size: 0.92rem;
  color: var(--ink-2);
  font-weight: 550;
}

/* ---------- CTA band ---------- */
.cta-band { padding: 48px 24px 96px; }
.cta-card {
  max-width: var(--maxw);
  margin: 0 auto;
  background: var(--ink);
  color: #fff;
  border-radius: 24px;
  padding: 72px 32px;
  text-align: center;
}
.cta-card h2 { color: #fff; }
.cta-card p { color: #b9bdc7; max-width: 38em; margin: 0 auto 1em; }
.cta-card .cta-row { justify-content: center; }
.cta-card .cta-note { color: #878d99; }

/* ---------- Footer ---------- */
footer { border-top: 1px solid var(--line); padding: 48px 24px 56px; }
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}
.footer-brand small { display: block; color: var(--ink-3); margin-top: 6px; font-size: 0.85rem; }
.footer-links { display: flex; gap: 48px; }
.footer-links ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.footer-links a { color: var(--ink-2); font-size: 0.88rem; }
.footer-links a:hover { color: var(--ink); }
.footer-links h5 {
  margin: 0 0 12px;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-3);
}
.footer-bottom {
  max-width: var(--maxw);
  margin: 36px auto 0;
  color: var(--ink-3);
  font-size: 0.8rem;
}

/* ---------- Pricing ---------- */
.page-head { padding: 72px 24px 8px; text-align: center; }
.page-head .lede { margin: 0 auto; }
.bill-toggle {
  display: inline-flex;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 99px;
  padding: 4px;
  margin: 26px auto 0;
}
.bill-toggle button {
  border: 0;
  background: transparent;
  padding: 8px 18px;
  border-radius: 99px;
  font-weight: 600;
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--ink-2);
  cursor: pointer;
}
.bill-toggle button.active { background: var(--ink); color: #fff; }
.bill-hint { display: block; margin-top: 10px; font-size: 0.82rem; color: var(--ink-3); }

.plans {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  max-width: 1160px;
  margin: 48px auto 0;
  padding: 0 24px;
  align-items: stretch;
}
.plan-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px 24px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
}
.plan-card.popular { border-color: var(--accent); box-shadow: var(--shadow); }
.chip-popular {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: #fff;
}
.plan-tag { color: var(--ink-2); font-size: 0.88rem; min-height: 3.6em; }
.plan-price { display: flex; align-items: baseline; gap: 10px; margin: 6px 0 4px; }
.plan-price strong { font-size: 2.4rem; letter-spacing: -0.04em; line-height: 1; }
.plan-price span { font-size: 0.78rem; color: var(--ink-3); line-height: 1.35; }
.plan-feats {
  list-style: none;
  padding: 0;
  margin: 18px 0;
  display: flex;
  flex-direction: column;
  gap: 9px;
  font-size: 0.88rem;
  color: var(--ink-2);
  flex: 1;
}
.plan-feats li { padding-left: 22px; position: relative; }
.plan-feats li::before {
  content: '\2713';
  position: absolute;
  left: 0;
  color: var(--accent-ink);
  font-weight: 700;
}
.seat-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  padding-top: 16px;
  font-size: 0.88rem;
  color: var(--ink-2);
}
.stepper { display: inline-flex; align-items: center; border: 1px solid var(--line); border-radius: 9px; overflow: hidden; }
.stepper button {
  width: 30px;
  height: 32px;
  border: 0;
  background: var(--surface);
  font-size: 1rem;
  font-family: inherit;
  cursor: pointer;
  color: var(--ink-2);
}
.stepper button:hover { background: var(--bg); }
.stepper input {
  width: 46px;
  height: 32px;
  border: 0;
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
  text-align: center;
  font: inherit;
  font-weight: 600;
  color: var(--ink);
  background: var(--surface);
}
.plan-total { font-size: 0.83rem; color: var(--ink-3); margin: 10px 0 14px; min-height: 1.3em; }
.plan-cta { width: 100%; }
.checkout-note {
  display: none;
  margin-top: 10px;
  background: var(--warn-soft);
  color: var(--warn-ink);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 0.8rem;
}
.checkout-note.show { display: block; }

.addon-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  max-width: 1160px;
  margin: 24px auto 0;
  padding: 0 24px;
}
.addon-card h3 { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.addon-card h3 em { font-style: normal; font-size: 0.95rem; color: var(--accent-ink); white-space: nowrap; }

.faq { max-width: 760px; margin: 0 auto; }
.faq details { border-bottom: 1px solid var(--line); padding: 6px 0; }
.faq summary { font-weight: 600; cursor: pointer; padding: 14px 0; }
.faq details p { color: var(--ink-2); font-size: 0.95rem; padding-bottom: 14px; }

/* ---------- Narrow pages (welcome, legal) ---------- */
.narrow { max-width: 640px; margin: 0 auto; padding: 96px 24px; }
.narrow.center { text-align: center; }
.steps { list-style: none; counter-reset: step; padding: 0; margin: 32px 0; text-align: left; }
.steps li {
  counter-increment: step;
  display: flex;
  gap: 16px;
  padding: 14px 0;
  color: var(--ink-2);
}
.steps li::before {
  content: counter(step);
  flex: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-ink);
  font-weight: 700;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.prose { max-width: 720px; margin: 0 auto; padding: 72px 24px 96px; }
.prose h1 { font-size: 2.2rem; }
.prose h2 { font-size: 1.3rem; margin-top: 2em; }
.prose p, .prose li { color: var(--ink-2); font-size: 0.98rem; }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero-inner, .gov-grid { grid-template-columns: 1fr; gap: 40px; }
  .grid-4, .plans { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .grid-4, .plans, .stats-row, .addon-grid { grid-template-columns: 1fr; }
  .app-frame-body { grid-template-columns: 1fr; }
  .feed { border-right: 0; border-bottom: 1px solid var(--line); }
  .nav-toggle { display: block; }
  .nav-links { display: none; }
  .nav.open .nav-links {
    display: flex;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg);
    flex-direction: column;
    align-items: flex-start;
    padding: 20px 24px;
    border-bottom: 1px solid var(--line);
    gap: 18px;
  }
  .hero { padding-top: 56px; }
  .section { padding: 64px 24px; }
}