:root {
  --bg: #f7f8fa;
  --ink: #1c2430;
  --muted: #5b6675;
  --line: #e4e8ee;
  --card: #ffffff;
  --brand: #2563a8;
  --brand-dark: #1c4a80;
  --ok: #1c8a5a;
  --warn: #b8860b;
  --radius: 12px;
  --maxw: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

/* nav */
.nav {
  display: flex; align-items: center; justify-content: space-between;
  max-width: var(--maxw); margin: 0 auto; padding: 18px 24px;
}
.nav nav { display: flex; align-items: center; gap: 22px; }
.nav nav a { color: var(--muted); font-size: 15px; }
.brand { display: inline-flex; align-items: center; gap: 9px; font-weight: 700; font-size: 19px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand-center { justify-content: center; margin-bottom: 26px; }
.logo {
  display: inline-grid; place-items: center;
  width: 30px; height: 30px; border-radius: 8px;
  background: var(--brand); color: #fff; font-weight: 800;
}

/* buttons */
.btn {
  display: inline-block; padding: 10px 18px; border-radius: 9px;
  font-size: 15px; font-weight: 600; cursor: pointer; border: 1px solid transparent;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); }
.btn-ghost { background: #fff; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: #cfd6df; }
.btn-block { width: 100%; }

/* hero */
.hero {
  max-width: var(--maxw); margin: 40px auto 0; padding: 0 24px;
  display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: center;
}
.eyebrow { color: var(--brand); font-weight: 700; font-size: 13px; letter-spacing: .06em; text-transform: uppercase; margin: 0 0 10px; }
.hero h1 { font-size: 46px; line-height: 1.08; margin: 0 0 18px; letter-spacing: -0.02em; }
.lead { color: var(--muted); font-size: 18px; max-width: 36ch; }
.cta-row { display: flex; gap: 12px; margin: 26px 0 12px; flex-wrap: wrap; }
.microcopy { color: var(--muted); font-size: 13px; }

.hero-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; box-shadow: 0 10px 30px rgba(28,36,48,.06);
}
.card-row { display: flex; justify-content: space-between; align-items: center; padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 15px; }
.card-total { display: flex; justify-content: space-between; align-items: center; padding-top: 16px; font-size: 15px; color: var(--muted); }
.card-total strong { font-size: 22px; color: var(--ink); }
.pill { font-size: 12px; font-weight: 700; padding: 3px 10px; border-radius: 999px; }
.pill-paid { background: #e7f4ee; color: var(--ok); }
.pill-sent { background: #eef3fb; color: var(--brand); }
.pill-draft { background: #f3f0e6; color: var(--warn); }

/* features */
.features {
  max-width: var(--maxw); margin: 80px auto 0; padding: 0 24px;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px;
}
.feature h3 { margin: 0 0 8px; font-size: 19px; }
.feature p { color: var(--muted); margin: 0; }

/* pricing */
.pricing { max-width: var(--maxw); margin: 90px auto 0; padding: 0 24px; text-align: center; }
.pricing h2 { font-size: 30px; margin: 0 0 32px; letter-spacing: -0.01em; }
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; text-align: left; }
.plan { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; }
.plan-featured { border-color: var(--brand); box-shadow: 0 12px 30px rgba(37,99,168,.10); }
.plan h4 { margin: 0 0 6px; font-size: 17px; color: var(--muted); }
.price { font-size: 38px; font-weight: 800; margin: 0 0 16px; }
.price span { font-size: 16px; font-weight: 500; color: var(--muted); }
.plan ul { list-style: none; padding: 0; margin: 0 0 20px; }
.plan li { padding: 7px 0; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 15px; }

/* docs */
.docs { max-width: 720px; margin: 90px auto 0; padding: 0 24px; }
.docs h2 { font-size: 26px; }
.docs p { color: var(--muted); }

/* footer */
.foot {
  max-width: var(--maxw); margin: 90px auto 0; padding: 30px 24px 50px;
  border-top: 1px solid var(--line); display: flex; justify-content: space-between;
  color: var(--muted); font-size: 14px; flex-wrap: wrap; gap: 14px;
}
.foot-links a { color: var(--muted); margin-left: 18px; }

/* auth */
.auth-body { display: grid; place-items: center; min-height: 100vh; }
.auth { width: 100%; max-width: 380px; padding: 24px; }
.auth-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; box-shadow: 0 12px 34px rgba(28,36,48,.07); }
.auth-card h1 { margin: 0 0 4px; font-size: 23px; }
.auth-sub { color: var(--muted); margin: 0 0 22px; font-size: 15px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; }
.field input { width: 100%; padding: 11px 13px; border: 1px solid var(--line); border-radius: 9px; font-size: 15px; }
.field input:focus { outline: none; border-color: var(--brand); }
.auth-msg { color: #b23; font-size: 14px; margin: 14px 0 0; }
.auth-foot { text-align: center; color: var(--muted); font-size: 14px; margin: 18px 0 0; }

@media (max-width: 820px) {
  .hero, .features, .plans { grid-template-columns: 1fr; }
  .hero { gap: 32px; }
  .hero h1 { font-size: 34px; }
  .nav nav a:not(.btn) { display: none; }
}