:root {
  color-scheme: light dark;
  --ink: #071011;
  --paper: #f7fbfa;
  --muted: #63706d;
  --teal: #007d74;
  --teal-deep: #073f3b;
  --amber: #d1841d;
  --rose: #9b3144;
  --line: rgba(7, 16, 17, .12);
  --glass: rgba(255,255,255,.68);
  --glass-strong: rgba(255,255,255,.82);
  --shadow: 0 28px 74px rgba(7,16,17,.14);
  --radius: 26px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 18% 0%, rgba(0,125,116,.18), transparent 35rem),
    radial-gradient(circle at 88% 20%, rgba(209,132,29,.13), transparent 30rem),
    linear-gradient(140deg, #f7fbfa, #eef5f3 42%, #fbf6ee);
  color: var(--ink);
}
a { color: inherit; }
.skip-link { position: absolute; left: -999px; }
.skip-link:focus { left: 1rem; top: 1rem; background: white; padding: .75rem; z-index: 10; border-radius: 999px; }
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: .85rem clamp(1rem, 4vw, 4rem);
  position: sticky;
  top: 0;
  backdrop-filter: blur(22px);
  background: rgba(247,251,250,.78);
  border-bottom: 1px solid var(--line);
  z-index: 2;
}
.brand { display: inline-flex; align-items: center; gap: .65rem; font-weight: 750; text-decoration: none; }
.nav div { display: flex; flex-wrap: wrap; gap: .45rem; font-size: .95rem; }
.nav a { text-decoration: none; }
.nav div a { padding: .55rem .75rem; border-radius: 999px; }
.nav div a:hover { background: rgba(0,125,116,.1); }
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 500px);
  gap: clamp(2rem, 6vw, 6rem);
  align-items: center;
  min-height: min(860px, calc(100vh - 68px));
  padding: clamp(2rem, 6vw, 6rem);
}
.hero-icon { width: 88px; height: 88px; border-radius: 24px; filter: drop-shadow(0 20px 34px rgba(0,0,0,.18)); }
.eyebrow { display: inline-flex; align-items: center; gap: .55rem; color: var(--teal-deep); font-weight: 720; font-size: .88rem; letter-spacing: 0; }
.eyebrow span { width: 9px; height: 9px; border-radius: 999px; background: linear-gradient(135deg, var(--teal), var(--amber)); box-shadow: 0 0 24px rgba(0,125,116,.35); }
h1 { font-size: clamp(4.5rem, 16vw, 10rem); line-height: .82; margin: 1rem 0; letter-spacing: 0; }
.lead { font-size: clamp(1.8rem, 5vw, 4rem); line-height: 1; max-width: 13ch; margin: 0 0 1rem; font-weight: 730; }
p { color: var(--muted); font-size: 1.08rem; line-height: 1.65; }
.actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 1.5rem; }
.button {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: .9rem 1.15rem;
  text-decoration: none;
  background: var(--glass);
  backdrop-filter: blur(18px);
  box-shadow: 0 10px 30px rgba(7,16,17,.06);
}
.primary { background: var(--teal); color: white; border-color: transparent; }
.trust-row { display: flex; flex-wrap: wrap; gap: .55rem; margin-top: 1.25rem; }
.trust-row span, .device-status span {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: .46rem .7rem;
  color: var(--teal-deep);
  background: rgba(255,255,255,.54);
  font-size: .84rem;
  font-weight: 650;
}
.device {
  border: 1px solid rgba(255,255,255,.7);
  border-radius: 42px;
  padding: 1.15rem;
  min-height: 640px;
  background:
    linear-gradient(180deg, rgba(255,255,255,.82), rgba(255,255,255,.38)),
    radial-gradient(circle at 80% 0%, rgba(0,125,116,.18), transparent 22rem);
  box-shadow: 0 42px 100px rgba(7,16,17,.18);
}
.device-top { display: flex; align-items: center; gap: .8rem; }
.device-top img { width: 48px; height: 48px; }
.device-top div { display: grid; gap: .15rem; }
.device-top span { color: var(--muted); font-size: .86rem; }
.device-status { display: flex; flex-wrap: wrap; gap: .55rem; justify-content: space-between; margin-top: 1rem; }
.screen-card, .screen-grid > div, .receipt, .card, .metrics > div, .workflow, .plain {
  border: 1px solid var(--line);
  background: var(--glass);
  backdrop-filter: blur(20px);
  border-radius: var(--radius);
  padding: 1.1rem;
  box-shadow: var(--shadow);
}
.screen-card { margin-top: 1.1rem; font-size: 1.55rem; font-weight: 740; }
.strong { color: #073f3b; }
.screen-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .8rem; margin-top: .8rem; }
.receipt { margin-top: .8rem; color: #0b4c45; }
.message-stack { display: grid; gap: .65rem; margin-top: 1rem; }
.bubble { max-width: 88%; padding: .85rem 1rem; border-radius: 22px; line-height: 1.45; }
.bubble.user { justify-self: end; background: linear-gradient(135deg, var(--teal-deep), var(--teal)); color: white; }
.bubble.ai { background: rgba(255,255,255,.64); border: 1px solid var(--line); }
.metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; padding: 0 clamp(1rem, 6vw, 6rem) 4rem; }
.metrics > div { display: grid; gap: .25rem; box-shadow: none; }
.metrics strong { font-size: clamp(1.35rem, 3vw, 2rem); }
.metrics span { color: var(--muted); }
.section-head { padding: 0 clamp(1rem, 6vw, 6rem) 1.3rem; max-width: 920px; }
.section-head h2, .workflow h2, .band h2 { font-size: clamp(2rem, 6vw, 4.6rem); line-height: .98; margin: .7rem 0; letter-spacing: 0; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; padding: 0 clamp(1rem, 6vw, 6rem) 4rem; }
.card { min-height: 205px; box-shadow: 0 20px 56px rgba(7,16,17,.08); }
.card h2 { margin: .8rem 0 0; font-size: 1.2rem; }
.card-icon {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(0,125,116,.18), rgba(209,132,29,.18));
  color: var(--teal-deep);
  font-weight: 760;
}
.workflow {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(280px, 1.1fr);
  gap: clamp(1.5rem, 5vw, 4rem);
  margin: 0 clamp(1rem, 6vw, 6rem) 4rem;
  padding: clamp(1.4rem, 4vw, 3rem);
}
.workflow ol { list-style: none; display: grid; gap: .75rem; padding: 0; margin: 0; counter-reset: steps; }
.workflow li { counter-increment: steps; display: grid; grid-template-columns: auto 1fr; gap: .3rem .8rem; align-items: start; padding: .95rem; border-radius: 22px; background: rgba(255,255,255,.45); border: 1px solid var(--line); }
.workflow li::before { content: counter(steps); grid-row: 1 / span 2; width: 28px; height: 28px; display: grid; place-items: center; border-radius: 999px; background: var(--teal); color: white; font-size: .85rem; font-weight: 750; }
.workflow li span { color: var(--muted); }
.band { padding: clamp(2rem, 6vw, 6rem); max-width: 980px; margin: 0 auto 2rem; text-align: center; }
.plain { padding: clamp(2rem, 6vw, 5rem); max-width: 980px; margin: clamp(1rem, 4vw, 3rem) auto; }
form { display: grid; gap: 1rem; max-width: 560px; }
input, textarea, button {
  width: 100%;
  font: inherit;
  border-radius: 18px;
  border: 1px solid var(--line);
  padding: .8rem;
}
textarea { min-height: 160px; }
button { background: var(--teal); color: white; border: 0; font-weight: 700; }
footer { display: flex; justify-content: space-between; gap: 1rem; padding: 2rem clamp(1rem, 4vw, 4rem); border-top: 1px solid var(--line); color: var(--muted); }
.footer-links { display: flex; gap: .8rem; flex-wrap: wrap; }
.footer-links a { text-decoration: none; }
@media (max-width: 820px) {
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .device { min-height: 420px; }
  .metrics { grid-template-columns: 1fr 1fr; }
  .workflow { grid-template-columns: 1fr; }
  .nav { align-items: flex-start; gap: .8rem; flex-direction: column; }
  footer { flex-direction: column; }
}
@media (max-width: 520px) {
  .metrics { grid-template-columns: 1fr; }
  .screen-grid { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: no-preference) {
  .button, .card, .screen-card { transition: transform .18s ease, box-shadow .18s ease; }
  .button:hover, .card:hover, .screen-card:hover { transform: translateY(-2px); }
}
@media (prefers-color-scheme: dark) {
  :root { --ink: #eff8f6; --paper: #071011; --muted: #a6b7b3; --line: rgba(255,255,255,.14); --glass: rgba(10,18,19,.62); --glass-strong: rgba(13,24,25,.82); --shadow: 0 28px 74px rgba(0,0,0,.25); }
  body { background: radial-gradient(circle at 12% 0%, rgba(0,125,116,.18), transparent 34rem), linear-gradient(140deg, #061010, #0d2422 52%, #251a0b); }
  .nav { background: rgba(6,16,16,.74); }
  .eyebrow { color: #7de4d8; }
  .button { background: rgba(255,255,255,.08); }
  .primary { background: #0f8f84; }
  .device { background: linear-gradient(180deg, rgba(255,255,255,.12), rgba(255,255,255,.05)); }
  .bubble.ai, .workflow li, .trust-row span, .device-status span { background: rgba(255,255,255,.08); }
  .strong, .receipt { color: #7de4d8; }
}