:root {
  --bg: #07111d;
  --panel: rgba(17, 24, 39, 0.92);
  --panel-2: rgba(12, 18, 30, 0.92);
  --border: rgba(255,255,255,0.08);
  --text: #eef4ff;
  --muted: #9fb0cf;
  --accent: #4da3ff;
  --success: #3fb950;
  --danger: #ef4444;
  --shadow: 0 18px 48px rgba(0,0,0,0.35);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background:
    radial-gradient(circle at top right, rgba(77,163,255,0.16), transparent 26%),
    linear-gradient(180deg, #050b14 0%, #091221 100%);
  color: var(--text);
}

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

.sim-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.sim-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7,17,29,0.88);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
}

.sim-header .sim-shell {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 16px 0;
}

.sim-brand {
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.sim-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.sim-nav a {
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--muted);
  border: 1px solid transparent;
}

.sim-nav a:hover {
  color: var(--text);
  border-color: var(--border);
  background: rgba(255,255,255,0.04);
}

.sim-main {
  padding: 34px 0 70px;
}

.sim-hero,
.sim-card {
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.sim-hero {
  padding: 28px;
  margin-bottom: 20px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  font-weight: 800;
}

.muted {
  color: var(--muted);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.sim-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 18px;
}

.sim-card {
  padding: 24px;
}

.sim-terminal-head {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 14px;
}

.sim-hint {
  color: var(--muted);
  max-width: 360px;
  line-height: 1.6;
  font-size: 0.92rem;
}

.sim-hint code {
  color: #d8ebff;
}

.sim-terminal-output {
  height: 340px;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: #050910;
  padding: 16px;
  font-family: Consolas, Monaco, monospace;
  line-height: 1.55;
  margin-bottom: 14px;
}

.term-line {
  margin-bottom: 8px;
  white-space: pre-wrap;
}

.term-line.input {
  color: #d8ebff;
}

.term-line.output {
  color: #9ad7ff;
}

.term-line.good {
  color: var(--success);
}

.term-line.bad {
  color: var(--danger);
}

.sim-terminal-form {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 10px;
  align-items: center;
}

.prompt {
  color: var(--success);
  font-family: Consolas, Monaco, monospace;
  white-space: nowrap;
}

#terminalInput,
#decisionSelect {
  width: 100%;
  padding: 12px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
}

.sim-objectives {
  padding-left: 20px;
  line-height: 1.8;
  color: var(--muted);
}

.sim-objectives li.complete {
  color: var(--success);
  font-weight: 700;
}

.sim-decision-wrap {
  margin-top: 22px;
}

.sim-decision-wrap label {
  display: block;
  margin-bottom: 8px;
  color: var(--text);
  font-weight: 700;
}

.sim-actions {
  margin-top: 18px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 16px;
  border-radius: 10px;
  border: 1px solid transparent;
  cursor: pointer;
  font-weight: 800;
}

.btn.primary {
  background: linear-gradient(135deg, var(--accent), #3ec7ff);
  color: #06101b;
}

.btn.ghost {
  background: rgba(255,255,255,0.04);
  color: var(--text);
  border-color: var(--border);
}

@media (max-width: 900px) {
  .sim-grid {
    grid-template-columns: 1fr;
  }

  .sim-hero,
  .sim-terminal-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .sim-terminal-form {
    grid-template-columns: 1fr;
  }
}