:root {
  --navy: #0b3d91;
  --navy-dark: #082c6b;
  --ink: #1a1f2b;
  --muted: #5c6573;
  --line: #e6e9ef;
  --bg: #f4f6fa;
  --success-bg: #e8f7ee;
  --success-text: #2e8b57;
  --total-bg: #eef4fb;
  --download-bg: #eef4fc;
  --shadow: 0 10px 30px rgba(16, 24, 40, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, "Segoe UI", system-ui, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, #dce8ff 0%, transparent 55%),
    var(--bg);
  min-height: 100vh;
}

.site-header {
  background: #fff;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-name {
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.01em;
}

.brand-sub {
  font-size: 12px;
  color: var(--muted);
}

.nav {
  display: flex;
  gap: 18px;
}

.nav a {
  color: var(--navy);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
}

main {
  max-width: 980px;
  margin: 0 auto;
  padding: 36px 24px 64px;
}

.hero {
  margin-bottom: 28px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--navy);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0 0 8px;
  font-size: 32px;
  letter-spacing: -0.03em;
}

.hero-copy {
  margin: 0 0 22px;
  color: var(--muted);
  max-width: 560px;
  line-height: 1.55;
}

.lookup-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px 18px 14px;
  box-shadow: var(--shadow);
  max-width: 640px;
}

.lookup-card label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 8px;
}

.lookup-row {
  display: flex;
  gap: 10px;
}

.lookup-row input {
  flex: 1;
  border: 1px solid #cfd6e4;
  border-radius: 10px;
  padding: 12px 14px;
  font: inherit;
  font-size: 15px;
}

.lookup-row input:focus {
  outline: 2px solid #b9ccee;
  border-color: var(--navy);
}

.lookup-row button,
.download-btn {
  border: 0;
  background: var(--navy);
  color: #fff;
  font: inherit;
  font-weight: 600;
  border-radius: 10px;
  padding: 12px 18px;
  cursor: pointer;
}

.lookup-row button:hover,
.download-btn:hover {
  background: var(--navy-dark);
}

.hint {
  margin: 8px 0 0;
  font-size: 12px;
  color: var(--muted);
}

.invoice-card {
  background: #fff;
  border-radius: 16px;
  box-shadow: var(--shadow);
  border: 1px solid #edf0f5;
  padding: 28px 32px 26px;
}

.invoice-title {
  margin: 0 0 14px;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.02em;
  padding-bottom: 14px;
  border-bottom: 2px solid #1b6b7a;
}

.success-banner {
  background: var(--success-bg);
  color: var(--success-text);
  border-radius: 10px;
  padding: 12px 16px;
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.check {
  font-weight: 700;
}

.fields {
  margin: 0;
}

.fields .row {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 16px;
  padding: 16px 4px;
  border-bottom: 1px solid var(--line);
  font-size: 14.5px;
}

.fields dt {
  margin: 0;
  font-weight: 700;
}

.fields dd {
  margin: 0;
  color: #4b5565;
}

.total-bar {
  margin: 18px 0 16px;
  background: var(--total-bg);
  border-radius: 8px;
  padding: 16px 20px;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 8px;
  font-size: 18px;
  font-weight: 700;
}

.download-box {
  background: var(--download-bg);
  border-radius: 12px;
  padding: 22px 20px 20px;
  text-align: center;
}

.download-icon {
  font-size: 22px;
  margin-bottom: 4px;
}

.download-copy strong {
  display: block;
  font-size: 15px;
}

.download-copy p {
  margin: 4px 0 14px;
  color: var(--muted);
  font-size: 13px;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 14px;
  text-decoration: none;
  color: #fff;
}

.site-footer {
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  padding: 0 24px 32px;
}

@media (max-width: 720px) {
  .header-inner,
  main {
    padding-left: 16px;
    padding-right: 16px;
  }

  .lookup-row,
  .fields .row {
    display: flex;
    flex-direction: column;
  }

  .invoice-card {
    padding: 20px 16px;
  }

  .total-bar {
    justify-content: space-between;
    font-size: 16px;
  }
}