* {
  box-sizing: border-box;
}

:root {
  --bg: #020617;
  --panel: rgba(255,255,255,0.05);
  --panel-strong: rgba(255,255,255,0.08);
  --line: rgba(255,255,255,0.10);
  --text: #e5eefc;
  --muted: #9fb0c9;
  --accent: #67e8f9;
  --accent-2: #a78bfa;
  --white: #ffffff;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, Arial, Helvetica, sans-serif;
  background:
    radial-gradient(circle at 10% 10%, rgba(34,211,238,0.18), transparent 20%),
    radial-gradient(circle at 90% 12%, rgba(167,139,250,0.18), transparent 20%),
    radial-gradient(circle at 50% 100%, rgba(16,185,129,0.10), transparent 24%),
    var(--bg);
  color: var(--text);
  line-height: 1.7;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}

.narrow {
  width: min(760px, 100%);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(12px);
  background: rgba(2, 6, 23, 0.82);
  border-bottom: 1px solid var(--line);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-weight: 700;
}

.brand-mark {
  width: 2.75rem;
  height: 2.75rem;
  display: grid;
  place-items: center;
  border-radius: 1rem;
  background: rgba(255,255,255,0.08);
  border: 1px solid var(--line);
}

.brand small {
  color: var(--muted);
  font-weight: 500;
}

.nav {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.nav a {
  color: var(--muted);
  font-size: 0.95rem;
}

.nav a:hover,
.nav a.active {
  color: var(--white);
}

.hero, .section, .page-shell {
  padding: 4.5rem 0;
}

.hero-grid,
.split,
.play-grid,
.footer-grid,
.services-grid {
  display: grid;
  gap: 1.5rem;
}

.hero-grid {
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  min-height: 70vh;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 1.5rem;
  padding: 1.5rem;
  box-shadow: 0 20px 50px rgba(0,0,0,0.18);
}

.highlight-card {
  background: linear-gradient(135deg, rgba(167,139,250,0.18), rgba(34,211,238,0.14));
}

.offset {
  transform: translateY(1.75rem);
}

.eyebrow {
  display: inline-block;
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  color: #bff5ff;
  background: rgba(103,232,249,0.12);
  border: 1px solid rgba(103,232,249,0.15);
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

.eyebrow.subtle {
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

h1, h2, h3, h4, p {
  margin-top: 0;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4.4rem);
  line-height: 1.08;
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(2rem, 4vw, 2.6rem);
  line-height: 1.15;
  margin-bottom: 1rem;
}

h3 {
  font-size: 1.35rem;
  line-height: 1.2;
  margin-bottom: 0.75rem;
}

.lead {
  font-size: 1.15rem;
  color: #d3def0;
}

.label {
  color: var(--muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.progress {
  width: 100%;
  height: 0.6rem;
  border-radius: 999px;
  background: rgba(255,255,255,0.08);
  overflow: hidden;
  margin: 1rem 0;
}

.progress span {
  display: block;
  width: 80%;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #a5f3fc);
}

.hero-actions,
.input-row,
.range-row {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  align-items: center;
}

.hero-actions {
  margin-top: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 1rem;
  padding: 0.85rem 1.2rem;
  border: 1px solid var(--line);
  font-weight: 600;
  cursor: pointer;
}

.btn-primary {
  background: var(--white);
  color: #0f172a;
}

.btn-secondary {
  background: transparent;
  color: var(--white);
}

.pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.pill-list span,
.contact-item {
  border: 1px solid var(--line);
  background: rgba(15, 23, 42, 0.7);
  border-radius: 1rem;
  padding: 0.9rem 1rem;
}

.split {
  grid-template-columns: 1.15fr 0.85fr;
}

.services-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 2rem;
}

.service-card .icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.section-copy {
  max-width: 62rem;
  color: var(--muted);
}

.play-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 2rem;
}

.game-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: start;
}

.score-box {
  min-width: 92px;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: 0.8rem;
  background: rgba(15, 23, 42, 0.82);
}

.score-box span,
.decoded-box span,
.contact-item span {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

.score-box strong {
  font-size: 1.8rem;
  color: #bff5ff;
}

.game-panel,
.cipher-box,
.decoded-box {
  margin-top: 1.2rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: rgba(15, 23, 42, 0.75);
  padding: 1rem;
}

input[type="number"],
input[type="text"] {
  width: 100%;
  min-width: 220px;
  padding: 0.85rem 1rem;
  border-radius: 1rem;
  border: 1px solid var(--line);
  background: rgba(2, 6, 23, 0.95);
  color: var(--text);
}

code {
  display: block;
  overflow-wrap: anywhere;
  color: #bff5ff;
  font-family: Consolas, Monaco, monospace;
}

.banner-card {
  background: linear-gradient(90deg, rgba(34,211,238,0.14), rgba(167,139,250,0.14));
}

.center-card {
  text-align: center;
  padding: 2.25rem;
}

.center-actions {
  justify-content: center;
}

.contact-stack {
  display: grid;
  gap: 1rem;
  margin: 2rem 0;
}

.contact-item strong {
  display: block;
  color: var(--white);
}

.site-footer {
  border-top: 1px solid var(--line);
  background: rgba(2, 6, 23, 0.75);
  padding: 2rem 0;
}

.footer-grid {
  grid-template-columns: 1fr 0.9fr;
  align-items: start;
}

.footer-grid.single {
  grid-template-columns: 1fr;
}

.footer-contact {
  background: rgba(255,255,255,0.04);
}

@media (max-width: 980px) {
  .hero-grid,
  .split,
  .play-grid,
  .footer-grid,
  .services-grid {
    grid-template-columns: 1fr 1fr;
  }

  .hero-grid {
    grid-template-columns: 1fr;
  }

  .offset {
    transform: none;
  }
}

@media (max-width: 700px) {
  .nav-wrap,
  .nav,
  .services-grid,
  .play-grid,
  .split,
  .footer-grid,
  .card-grid {
    grid-template-columns: 1fr;
  }

  .nav {
    justify-content: flex-start;
  }

  .services-grid {
    display: grid;
  }

  .play-grid,
  .split,
  .footer-grid,
  .card-grid {
    display: grid;
  }

  .hero,
  .section,
  .page-shell {
    padding: 3.5rem 0;
  }
}