/* ChartAI marketing site — built on design tokens in colors_and_type.css */

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--fg-1);
  background: var(--bg-1);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Skip link */
.skip-link {
  position: absolute;
  left: 16px;
  top: -100px;
  background: var(--chartai-navy-800);
  color: #fff;
  padding: 10px 16px;
  border-radius: 8px;
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  z-index: 1000;
  transition: top 180ms;
}
.skip-link:focus { top: 12px; outline: 2px solid var(--chartai-teal-500); outline-offset: 2px; }

/* Focus rings — visible everywhere, never suppressed */
:focus-visible {
  outline: 2px solid var(--chartai-teal-600);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Containers */
.container { max-width: 1080px; margin: 0 auto; padding: 0 32px; }
.container--narrow { max-width: 760px; }

/* ============ Nav ============ */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--border-1);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--fg-1);
}
.nav__mark { width: 28px; height: 28px; }
.nav__word {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--chartai-navy-800);
}
.nav__links {
  display: flex;
  gap: 28px;
}
.nav__links a {
  font-size: 14px;
  color: var(--fg-2);
  text-decoration: none;
  font-weight: 500;
  transition: color 180ms;
}
.nav__links a:hover { color: var(--chartai-navy-800); }
.nav__cta {
  display: inline-flex;
  align-items: center;
  background: var(--chartai-navy-800);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 8px;
  text-decoration: none;
  transition: background 180ms;
}
.nav__cta:hover { background: var(--chartai-navy-900); }
@media (max-width: 720px) {
  .nav__links { display: none; }
}

/* ============ Section scaffolding ============ */
section { padding: 96px 0; scroll-margin-top: 80px; }
@media (max-width: 720px) { section { padding: 64px 0; } }

.eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--chartai-teal-700);
  margin-bottom: 14px;
}

h1, h2, h3 { color: var(--chartai-navy-900); margin: 0; }

.section-title {
  font-family: var(--font-serif);
  font-size: 40px;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
  color: var(--chartai-navy-900);
  max-width: 720px;
  text-wrap: balance;
}
.section-lede {
  font-size: 18px;
  line-height: 1.6;
  color: var(--fg-2);
  max-width: 640px;
  text-wrap: pretty;
}
@media (max-width: 720px) {
  .section-title { font-size: 30px; }
  .section-lede { font-size: 16px; }
}

/* ============ Hero ============ */
.hero {
  padding: 88px 0 96px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 85% 20%, rgba(42, 157, 143, 0.06), transparent 70%),
    radial-gradient(ellipse 60% 50% at 10% 90%, rgba(13, 43, 69, 0.04), transparent 70%);
  pointer-events: none;
}
.hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 64px;
  align-items: center;
}
@media (max-width: 920px) {
  .hero__inner { grid-template-columns: 1fr; gap: 48px; }
}
.hero__copy { max-width: 580px; }
.hero h1 {
  font-family: var(--font-serif);
  font-size: 56px;
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.025em;
  color: var(--chartai-navy-900);
  margin-bottom: 20px;
  text-wrap: balance;
}
.hero h1 em { font-style: normal; color: var(--chartai-teal-700); }
.hero__sub {
  font-size: 19px;
  line-height: 1.55;
  color: var(--fg-2);
  margin: 0 0 32px;
  text-wrap: pretty;
}
.hero__cta-row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.btn-primary, .btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  padding: 13px 22px;
  border-radius: 10px;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid;
  transition: all 180ms var(--ease-standard);
  font-family: inherit;
}
.btn-primary {
  background: var(--chartai-navy-800);
  color: #fff;
  border-color: var(--chartai-navy-800);
  box-shadow: 0 1px 0 rgba(0,0,0,.06), inset 0 1px 0 rgba(255,255,255,.08);
}
.btn-primary:hover { background: var(--chartai-navy-900); transform: translateY(-1px); box-shadow: 0 4px 14px rgba(13,43,69,.18); }
.btn-secondary {
  background: #fff;
  color: var(--chartai-navy-800);
  border-color: var(--border-2);
}
.btn-secondary:hover { border-color: var(--chartai-navy-800); }
.hero__meta {
  display: flex;
  gap: 24px;
  margin-top: 32px;
  font-size: 13px;
  color: var(--fg-3);
  flex-wrap: wrap;
}
.hero__meta-item { display: flex; align-items: center; gap: 6px; }
.hero__meta-item svg { color: var(--chartai-teal-600); }

@media (max-width: 720px) {
  .hero h1 { font-size: 40px; }
  .hero__sub { font-size: 17px; }
}

/* ============ Chat preview (hero right) ============ */
.chat {
  background: #fff;
  border: 1px solid var(--border-1);
  border-radius: 14px;
  box-shadow: var(--shadow-3);
  overflow: hidden;
  font-size: 14px;
}
.chat__head {
  background: linear-gradient(135deg, var(--chartai-navy-800) 0%, var(--chartai-navy-700) 100%);
  color: #fff;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.chat__head-l { display: flex; align-items: center; gap: 10px; }
.chat__head-mark { width: 24px; height: 24px; background: #fff; border-radius: 6px; display: flex; align-items: center; justify-content: center; }
.chat__head-mark img { width: 18px; height: 18px; }
.chat__head-title { font-family: var(--font-serif); font-size: 16px; font-weight: 600; }
.chat__head-status { font-family: var(--font-mono); font-size: 11px; color: rgba(255,255,255,.6); display: flex; align-items: center; gap: 6px; }
.chat__head-status::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--chartai-teal-400); }
.chat__patient {
  padding: 10px 18px;
  border-bottom: 1px solid var(--border-1);
  background: var(--bg-2);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}
.chat__patient-name { font-size: 13px; font-weight: 600; color: var(--fg-1); }
.chat__patient-id { font-family: var(--font-mono); font-size: 11px; color: var(--fg-3); }
.chat__body {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--bg-2);
}
.chat__msg { display: flex; }
.chat__msg--user { justify-content: flex-end; }
.chat__msg--assistant { justify-content: flex-start; }
.chat__bubble {
  max-width: 92%;
  padding: 11px 15px;
  font-size: 14px;
  line-height: 1.5;
}
.chat__msg--user .chat__bubble {
  background: var(--chartai-navy-800);
  color: #fff;
  border-radius: 14px 4px 14px 14px;
}
.chat__msg--assistant .chat__bubble {
  background: #fff;
  color: var(--fg-1);
  border: 1px solid var(--border-1);
  border-radius: 4px 14px 14px 14px;
  box-shadow: var(--shadow-1);
}
.chat__bubble strong { font-weight: 600; }
.chat__bubble .trend {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 12px;
  font-family: var(--font-mono);
  background: var(--chartai-warning-bg);
  color: #8A5A00;
  font-weight: 600;
}
.chat__bubble ul { margin: 8px 0 0; padding-left: 18px; }
.chat__bubble li { margin-bottom: 4px; }
.chat__cite {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-3);
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px dashed var(--border-1);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.chat__cite-item { display: inline-flex; align-items: center; gap: 4px; }
.chat__cite-item::before { content: '↳'; color: var(--chartai-teal-600); }
.chat__disclosure {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--chartai-info);
  margin-top: 8px;
  padding-top: 6px;
  border-top: 1px dashed var(--border-1);
  font-style: italic;
}
.chat__composer {
  padding: 12px 18px;
  border-top: 1px solid var(--border-1);
  background: #fff;
  display: flex;
  gap: 8px;
  align-items: center;
}
.chat__composer-input {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--fg-3);
  padding: 8px 12px;
  background: var(--bg-2);
  border-radius: 8px;
  border: 1px solid var(--border-1);
}
.chat__composer-input::after { content: '|'; animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.chat__composer-send {
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--chartai-teal-600); color: #fff;
  display: flex; align-items: center; justify-content: center;
}

/* ============ Problem ============ */
.problem { background: var(--bg-2); }
.problem__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}
@media (max-width: 720px) { .problem__grid { grid-template-columns: 1fr; } }
.problem__card {
  background: #fff;
  border: 1px solid var(--border-1);
  border-radius: 12px;
  padding: 28px;
}
.problem__card h3 {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 600;
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}
.problem__card p {
  margin: 0;
  color: var(--fg-2);
  font-size: 15px;
  line-height: 1.55;
}
.problem__card .stat {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--chartai-teal-700);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 18px;
  display: block;
}

/* ============ How it works ============ */
.how__steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 56px;
  position: relative;
}
@media (max-width: 720px) { .how__steps { grid-template-columns: 1fr; gap: 40px; } }
.how__step { position: relative; }
.how__step-num {
  font-family: var(--font-serif);
  font-size: 48px;
  font-weight: 600;
  color: var(--chartai-teal-600);
  line-height: 1;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}
.how__step h3 {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 600;
  margin: 0 0 10px;
  letter-spacing: -0.01em;
}
.how__step p { margin: 0; color: var(--fg-2); font-size: 15px; line-height: 1.6; }

/* ============ Capabilities (chat cards) ============ */
.capabilities { background: var(--bg-2); }
.cap__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 56px;
}
@media (max-width: 920px) { .cap__grid { grid-template-columns: 1fr; } }
.cap__card {
  background: #fff;
  border: 1px solid var(--border-1);
  border-radius: 12px;
  padding: 22px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  box-shadow: var(--shadow-1);
}
.cap__card-head {
  font-size: 11px;
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--chartai-teal-700);
}
.cap__q {
  background: var(--chartai-navy-800);
  color: #fff;
  align-self: flex-end;
  max-width: 90%;
  padding: 10px 14px;
  border-radius: 14px 4px 14px 14px;
  font-size: 14px;
  line-height: 1.45;
}
.cap__a {
  background: var(--bg-2);
  color: var(--fg-1);
  border: 1px solid var(--border-1);
  align-self: flex-start;
  max-width: 95%;
  padding: 12px 14px;
  border-radius: 4px 14px 14px 14px;
  font-size: 14px;
  line-height: 1.55;
}
.cap__a strong { color: var(--chartai-navy-900); font-weight: 600; }
.cap__a .num { font-family: var(--font-mono); font-weight: 600; color: var(--chartai-navy-800); }
.cap__a ul { margin: 8px 0 0; padding-left: 18px; }
.cap__a li { margin-bottom: 4px; }
.cap__cite {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-3);
  padding-top: 8px;
  margin-top: 4px;
  border-top: 1px dashed var(--border-1);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
}
.cap__cite-item { display: inline-flex; align-items: center; gap: 4px; }
.cap__cite-item::before { content: '↳'; color: var(--chartai-teal-600); }
.cap__disclose {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--chartai-info);
  font-style: italic;
}

/* ============ Privacy ============ */
.privacy {
  background: var(--chartai-navy-900);
  color: #fff;
}
.privacy h2, .privacy h3 { color: #fff; }
.privacy .eyebrow { color: var(--chartai-teal-400); }
.privacy .section-lede { color: rgba(255,255,255,.78); }
.privacy__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 48px;
}
@media (max-width: 920px) { .privacy__grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 540px) { .privacy__grid { grid-template-columns: 1fr; } }
.privacy__item {
  padding: 22px;
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 12px;
  background: rgba(255,255,255,.02);
}
.privacy__item h3 {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  margin: 0 0 8px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: #fff;
}
.privacy__item h3 svg { color: var(--chartai-teal-400); }
.privacy__item p { font-size: 13px; line-height: 1.55; color: rgba(255,255,255,.68); margin: 0; }

/* ============ Behind it ============ */
.behind__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
@media (max-width: 720px) { .behind__inner { grid-template-columns: 1fr; gap: 32px; } }
.behind__quote {
  border-left: 3px solid var(--chartai-teal-600);
  padding-left: 24px;
  font-family: var(--font-serif);
  font-size: 22px;
  line-height: 1.45;
  color: var(--chartai-navy-900);
  font-style: italic;
  font-weight: 500;
  text-wrap: balance;
}
.behind__attrib {
  margin-top: 16px;
  font-style: normal;
  font-size: 13px;
  color: var(--fg-3);
  font-family: var(--font-sans);
  font-weight: 500;
  letter-spacing: 0.02em;
}
.behind__facts { display: flex; flex-direction: column; gap: 18px; }
.behind__fact {
  padding: 16px 0;
  border-bottom: 1px solid var(--border-1);
}
.behind__fact:last-child { border-bottom: none; }
.behind__fact-k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-bottom: 4px;
}
.behind__fact-v { font-size: 16px; color: var(--fg-1); font-weight: 500; line-height: 1.5; }
.behind__fact-v strong { color: var(--chartai-navy-900); font-weight: 600; }

/* ============ Form ============ */
.pilot { background: var(--bg-2); }
.pilot__inner {
  background: #fff;
  border: 1px solid var(--border-1);
  border-radius: 16px;
  padding: 56px;
  margin-top: 40px;
  box-shadow: var(--shadow-1);
}
@media (max-width: 720px) { .pilot__inner { padding: 32px 24px; } }
.pilot form { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 32px; }
.pilot form .full { grid-column: 1 / -1; }
@media (max-width: 600px) { .pilot form { grid-template-columns: 1fr; } }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label {
  font-size: 13px;
  font-weight: 600;
  color: var(--fg-1);
}
.field label .req { color: var(--chartai-danger); margin-left: 2px; }
.field input, .field select, .field textarea {
  font-family: inherit;
  font-size: 15px;
  color: var(--fg-1);
  padding: 11px 14px;
  background: #fff;
  border: 1px solid var(--border-2);
  border-radius: 8px;
  outline: none;
  transition: all 180ms;
}
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--chartai-teal-600);
  box-shadow: 0 0 0 3px rgba(42, 157, 143, 0.16);
}
.field input::placeholder { color: var(--chartai-ink-400); }
.field textarea { resize: vertical; min-height: 90px; }
.field .help { font-size: 12px; color: var(--fg-3); }
.pilot__submit-row {
  margin-top: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.pilot__note { font-size: 12px; color: var(--fg-3); max-width: 380px; line-height: 1.5; }

/* Sent state */
.pilot__sent {
  display: none;
  text-align: center;
  padding: 32px;
}
.pilot__sent--on { display: block; }
.pilot__sent svg { color: var(--chartai-teal-600); margin-bottom: 16px; }
.pilot__sent h3 {
  font-family: var(--font-serif);
  font-size: 24px;
  margin: 0 0 8px;
  color: var(--chartai-navy-900);
}
.pilot__sent p { margin: 0; color: var(--fg-2); font-size: 15px; }

/* ============ Footer ============ */
.footer {
  background: var(--chartai-navy-900);
  color: rgba(255,255,255,.7);
  padding: 56px 0 32px;
  font-size: 14px;
}
.footer__top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,.1);
}
@media (max-width: 720px) { .footer__top { grid-template-columns: 1fr 1fr; gap: 32px; } }
.footer__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.footer__brand img { width: 28px; height: 28px; }
.footer__brand span {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 600;
  color: #fff;
  letter-spacing: -0.01em;
}
.footer__tag { color: rgba(255,255,255,.6); max-width: 280px; line-height: 1.5; }
.footer h4 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 600;
  color: rgba(255,255,255,.5);
  margin: 0 0 14px;
}
.footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
.footer a { color: rgba(255,255,255,.78); text-decoration: none; transition: color 180ms; }
.footer a:hover { color: #fff; }
.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  font-size: 12px;
  color: rgba(255,255,255,.5);
  flex-wrap: wrap;
  gap: 12px;
}
.footer__bottom .mono { font-family: var(--font-mono); }