:root {
  --primary: #004ac6;
  --primary-hover: #003ea8;
  --primary-container: #2563eb;
  --accent-cyan: #06b6d4;
  --navy: #0f172a;
  --navy-light: #1e293b;
  --slate: #475569;
  --muted: #94a3b8;
  --muted-fg: #64748b;
  --border: #e2e8f0;
  --border-hairline: rgba(15, 23, 42, 0.08);
  --background: #faf8ff;
  --foreground: #0f172a;
  --card: #ffffff;
  --surface: #faf8ff;
  --surface-elevated: #f1f5f9;
  --danger: #b91c1c;
  --font-sans: "Geist", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --shadow-1:
    0 1px 3px rgba(15, 23, 42, 0.04),
    0 4px 12px rgba(37, 99, 235, 0.03);
  --shadow-2:
    0 8px 24px -4px rgba(15, 23, 42, 0.06),
    0 2px 6px -1px rgba(37, 99, 235, 0.06);
  --brand-gradient: linear-gradient(135deg, #004ac6 0%, #2563eb 50%, #06b6d4 100%);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  color: var(--foreground);
  font-family: var(--font-sans);
  background: var(--background);
  -webkit-font-smoothing: antialiased;
}

.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image: radial-gradient(
    60% 60% at 50% 0%,
    rgba(37, 99, 235, 0.08) 0%,
    rgba(6, 182, 212, 0.04) 45%,
    transparent 100%
  );
}

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  max-width: 72rem;
  margin: 0 auto;
  border-bottom: 1px solid var(--border-hairline);
  background: rgba(250, 248, 255, 0.85);
  backdrop-filter: blur(16px);
  position: sticky;
  top: 0;
  z-index: 20;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--navy);
  text-decoration: none;
  letter-spacing: -0.02em;
  min-width: 0;
}

.brand-logo {
  display: block;
  height: 1.75rem;
  width: auto;
  max-width: min(160px, 42vw);
  object-fit: contain;
  object-position: left center;
}

.brand-product {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--primary);
  border-left: 1px solid var(--border);
  padding-left: 0.55rem;
  line-height: 1;
  white-space: nowrap;
}

.brand span:not(.brand-product) {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

nav a {
  color: var(--muted-fg);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}

nav a:hover {
  color: var(--primary);
}

main {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0.5rem 1.25rem 3.5rem;
}

.hero {
  padding: 3rem 0 2rem;
  max-width: 44rem;
}

.kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
  margin: 0 0 0.85rem;
}

.kicker a,
.lede a,
.hint a,
.panel a:not(.btn) {
  color: var(--primary);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

h1 {
  font-size: clamp(2.4rem, 6vw, 3.75rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 0.85rem;
  color: var(--navy);
}

.lede {
  font-size: 1.125rem;
  line-height: 1.55;
  color: var(--slate);
  margin: 0 0 1.5rem;
  max-width: 36rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  appearance: none;
  border: 1px solid transparent;
  border-radius: 0.75rem;
  padding: 0.75rem 1.15rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition:
    background 0.15s ease,
    border-color 0.15s ease,
    box-shadow 0.15s ease;
}

.btn.primary {
  background: var(--primary);
  color: #fff;
  box-shadow: var(--shadow-1);
}

.btn.primary:hover {
  background: var(--primary-hover);
}

.btn.ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--navy);
}

.btn.ghost:hover {
  border-color: #3b82f6;
  box-shadow: var(--shadow-1);
}

.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.35rem 1.4rem;
  margin: 1.25rem 0;
  box-shadow: var(--shadow-1);
}

.panel.soft {
  background: rgba(255, 255, 255, 0.72);
}

.panel h2 {
  margin: 0 0 0.45rem;
  font-size: 1.35rem;
  letter-spacing: -0.025em;
  color: var(--navy);
}

.hint,
.muted {
  color: var(--muted-fg);
  margin-top: 0;
  line-height: 1.5;
}

.scan-form {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1rem;
}

.scan-form input,
.auth-form input {
  flex: 1 1 220px;
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 0.8rem 1rem;
  font: inherit;
  background: #fff;
  color: var(--navy);
}

.scan-form input:focus,
.auth-form input:focus {
  outline: 2px solid rgba(0, 74, 198, 0.25);
  border-color: var(--primary-container);
}

.quota,
.status {
  margin: 0.85rem 0 0;
  color: var(--muted-fg);
  font-size: 0.95rem;
}

.status.error {
  color: var(--danger);
}

.result {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.result h3 {
  margin: 0 0 0.35rem;
  letter-spacing: -0.02em;
  color: var(--navy);
}

.builders {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.75rem 0;
}

.chip {
  border-radius: 999px;
  border: 1px solid var(--border);
  padding: 0.2rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--surface-elevated);
  color: var(--navy-light);
}

.evidence {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
}

.evidence li {
  padding: 0.75rem 0;
  border-top: 1px solid var(--border-hairline);
}

.evidence strong {
  display: block;
  margin-bottom: 0.2rem;
  color: var(--navy);
}

.evidence code {
  display: block;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--muted-fg);
}

.plain {
  padding-left: 1.1rem;
  color: var(--slate);
  line-height: 1.55;
}

.grid-2 {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: 1fr 1fr;
  }
}

.callout {
  border-left: 3px solid var(--primary);
  padding: 0.85rem 1rem;
  background: #f2f3ff;
  border-radius: 0 0.75rem 0.75rem 0;
  color: var(--slate);
  margin: 1rem 0 0;
}

footer {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 1.25rem 2.5rem;
  color: var(--muted-fg);
  font-size: 0.95rem;
}

footer a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.auth-form {
  display: grid;
  gap: 0.75rem;
  max-width: 28rem;
}

@media (max-width: 640px) {
  .top {
    align-items: flex-start;
    flex-direction: column;
  }

  .brand-logo {
    height: 1.5rem;
    max-width: min(140px, 48vw);
  }

  .hero {
    padding-top: 1.5rem;
  }
}