:root {
  --bg-1: #08121e;
  --bg-2: #122238;
  --panel: rgba(8, 20, 34, 0.8);
  --text: #e9f6ff;
  --muted: #abc6da;
  --border: rgba(255, 255, 255, 0.14);
  --accent: #0ea5e9;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "IBM Plex Sans", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 10% 15%, rgba(14, 165, 233, 0.24), transparent 36%),
    radial-gradient(circle at 85% 22%, rgba(56, 189, 248, 0.18), transparent 34%),
    linear-gradient(140deg, var(--bg-1), var(--bg-2));
}

.shell {
  width: min(1100px, calc(100% - 28px));
  margin: 0 auto;
  padding: 26px 0 48px;
}

.back-link {
  display: inline-block;
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
  margin-bottom: 16px;
}

.hero {
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 28px;
  background: var(--panel);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.74rem;
  font-weight: 700;
}

h1,
h2 {
  font-family: "Sora", sans-serif;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 3.5rem);
}

.hero-copy {
  margin: 12px 0 0;
  color: var(--muted);
  max-width: 700px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

button,
input {
  font: inherit;
}

.btn-primary,
.btn-ghost {
  border-radius: 999px;
  padding: 10px 16px;
  cursor: pointer;
  border: 1px solid transparent;
  font-weight: 700;
}

.btn-primary {
  color: #021624;
  background: var(--accent);
}

.btn-ghost {
  color: var(--text);
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--border);
}

.grid {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.card {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px;
  background: var(--panel);
}

.controls-card {
  grid-row: span 2;
}

h2 {
  margin: 0 0 6px;
  font-size: 1.15rem;
}

.muted {
  margin: 0 0 14px;
  color: var(--muted);
}

.field {
  display: block;
  margin-bottom: 12px;
  font-weight: 600;
}

.field input {
  margin-top: 6px;
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.07);
  color: var(--text);
  padding: 10px 12px;
}

.field input[type="color"] {
  padding: 0;
  height: 42px;
}

.feature-list,
.steps {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

.feature-list li,
.steps li {
  margin-bottom: 8px;
}

.demo-text {
  margin: 0;
  color: var(--muted);
  padding: 12px;
  border-radius: 10px;
  border: 1px dashed var(--border);
}

.demo-text.is-success {
  color: #d6ffea;
  border-style: solid;
  border-color: rgba(34, 197, 94, 0.5);
  background: rgba(34, 197, 94, 0.15);
}

@media (max-width: 860px) {
  .grid {
    grid-template-columns: 1fr;
  }

  .controls-card {
    grid-row: auto;
  }
}