:root {
  color-scheme: dark;
  --bg: #0f1117;
  --bg-card: #171a23;
  --text: #e9eefc;
  --muted: #aeb8d1;
  --accent: #6aa0ff;
  --border: #2b3245;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  font-family: Inter, Segoe UI, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

.access-gate {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.access-card {
  width: min(460px, 92vw);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
}

.access-card label {
  display: block;
  margin-bottom: 0.35rem;
}

.access-card input,
.access-card button {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0c0f16;
  color: var(--text);
  padding: 0.55rem 0.7rem;
  font: inherit;
}

.access-card button {
  margin-top: 0.6rem;
  cursor: pointer;
}

.gate-error {
  color: var(--accent);
  min-height: 1.25rem;
  margin: 0.55rem 0 0;
}

.hero,
main,
footer {
  width: min(1100px, 92vw);
  margin: 0 auto;
}

.hero {
  padding: 3rem 0 2rem;
}

.kicker {
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 0.4rem;
}

h1,
h2,
h3 {
  line-height: 1.2;
}

h1 {
  margin: 0;
  font-size: clamp(1.9rem, 2.8vw, 3rem);
}

main section {
  padding: 1.2rem 0;
  border-top: 1px solid var(--border);
}

.hero-grid,
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.8rem;
  margin-top: 1rem;
}

.hero-grid > div,
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.9rem;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.8rem;
}

.controls button {
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  border-radius: 999px;
  padding: 0.45rem 0.75rem;
  cursor: pointer;
}

.controls button.active {
  border-color: var(--accent);
  color: var(--accent);
}

.diagram {
  background: #0c0f16;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.6rem;
  overflow: auto;
}

.diagram svg {
  height: auto;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  border: 1px solid var(--border);
  padding: 0.6rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--bg-card);
}

.formula {
  font-size: 1.02rem;
  color: var(--accent);
}

footer {
  border-top: 1px solid var(--border);
  margin-top: 2rem;
  padding: 1rem 0 2rem;
  color: var(--muted);
}

@media (max-width: 700px) {
  .hero {
    padding-top: 2rem;
  }
}