:root {
  color-scheme: dark;
  --void-bg: #030303;
  --void-surface: rgba(255, 255, 255, 0.045);
  --void-surface-muted: rgba(255, 255, 255, 0.03);
  --void-border: rgba(255, 255, 255, 0.08);
  --void-border-strong: rgba(255, 255, 255, 0.16);
  --void-accent: #4dffb3;
  --void-accent-soft: rgba(77, 255, 179, 0.18);
  --void-text: #e4e4e4;
  --void-muted: rgba(228, 228, 228, 0.72);
  --void-error: #ff6f87;
  --void-radius: 18px;
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont,
    "Helvetica Neue", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top, rgba(77, 255, 179, 0.05), transparent 60%),
    var(--void-bg);
  color: var(--void-text);
}

.main-shell {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 24px 64px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 16px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.brand-title {
  font-size: 1.4rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.brand-subtitle {
  font-size: 0.77rem;
  color: var(--void-muted);
  letter-spacing: 0.12em;
}

.meta-row {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.meta-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--void-surface);
  border: 1px solid var(--void-border);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.meta-link {
  color: var(--void-accent);
  text-decoration: none;
  letter-spacing: 0.08em;
  font-size: 0.78rem;
}

.protocol-shell {
  display: flex;
  flex-direction: column;
  gap: 28px;
  background: var(--void-surface-muted);
  border: 1px solid var(--void-border);
  border-radius: var(--void-radius);
  padding: 32px;
}

.protocol-header {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.protocol-title {
  font-size: 1.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin: 0;
}

.protocol-description {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.6;
  color: var(--void-muted);
  max-width: 640px;
}

.controls-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 16px;
  border-radius: 16px;
  background: var(--void-surface);
  border: 1px solid var(--void-border);
}

.control-label {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
  color: var(--void-muted);
}

.control-input {
  appearance: none;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--void-border);
  background: var(--void-surface-muted);
  color: var(--void-text);
  font-size: 0.96rem;
}

.control-input:focus {
  outline: none;
  border-color: var(--void-accent);
  box-shadow: 0 0 0 3px rgba(77, 255, 179, 0.18);
}

.control-hint {
  font-size: 0.78rem;
  color: var(--void-muted);
}

.choice-buttons {
  display: inline-flex;
  gap: 10px;
}

.choice-button {
  appearance: none;
  padding: 10px 18px;
  border-radius: 12px;
  border: 1px solid var(--void-border);
  background: var(--void-surface-muted);
  color: var(--void-text);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease;
}

.choice-button[data-active="true"],
.choice-button:hover:not(:disabled) {
  border-color: rgba(77, 255, 179, 0.6);
  background: rgba(77, 255, 179, 0.14);
}

.choice-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.coin-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  padding: 32px 16px;
  border-radius: 18px;
  background: radial-gradient(circle at 50% -20%, rgba(77, 255, 179, 0.18), transparent 60%),
    var(--void-surface);
  border: 1px solid var(--void-border);
}

.coin-container {
  width: 160px;
  height: 160px;
  perspective: 1200px;
}

.coin {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s ease;
}

.coin-face {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 2px solid rgba(77, 255, 179, 0.4);
  background: linear-gradient(145deg, rgba(77, 255, 179, 0.2), rgba(77, 255, 179, 0.05));
  backdrop-filter: blur(16px);
  font-size: 1.02rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--void-accent);
  backface-visibility: hidden;
}

.coin-face--tails {
  transform: rotateY(180deg);
}

.coin[data-face="heads"] {
  transform: rotateY(0deg);
}

.coin[data-face="tails"] {
  transform: rotateY(180deg);
}

.coin--flipping {
  animation: coinflip-spin 1.4s cubic-bezier(0.4, 0.05, 0.2, 1) forwards;
}

@keyframes coinflip-spin {
  0% {
    transform: rotateY(0deg) rotateX(0deg);
  }
  25% {
    transform: rotateY(540deg) rotateX(18deg);
  }
  50% {
    transform: rotateY(900deg) rotateX(-10deg);
  }
  75% {
    transform: rotateY(1260deg) rotateX(14deg);
  }
  100% {
    transform: rotateY(1620deg) rotateX(0deg);
  }
}

.coin-result {
  margin: 0;
  font-size: 1rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--void-muted);
}

.coin-result[data-state="win"] {
  color: var(--void-accent);
}

.coin-result[data-state="lose"] {
  color: var(--void-error);
}

.action-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.action-button {
  appearance: none;
  padding: 12px 22px;
  border-radius: 14px;
  border: 1px solid var(--void-border);
  background: var(--void-surface);
  color: var(--void-text);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.78rem;
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease;
}

.action-button.accent {
  border-color: rgba(77, 255, 179, 0.6);
  background: rgba(77, 255, 179, 0.14);
  color: var(--void-accent);
}

.action-button:hover:not(:disabled) {
  border-color: rgba(77, 255, 179, 0.6);
  background: rgba(77, 255, 179, 0.12);
}

.action-button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.log-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.log-title {
  margin: 0;
  font-size: 0.92rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--void-muted);
}

.log-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.log-entry {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 12px 16px;
  border-radius: 12px;
  background: var(--void-surface);
  border: 1px solid var(--void-border);
  font-size: 0.82rem;
}

.log-entry__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.log-entry__delta {
  font-variant-numeric: tabular-nums;
}

.log-entry[data-result="win"] .log-entry__delta {
  color: var(--void-accent);
}

.log-entry[data-result="lose"] .log-entry__delta {
  color: var(--void-error);
}

.status-line {
  margin: 0;
  padding: 14px 16px;
  border-radius: 12px;
  background: var(--void-surface);
  border: 1px solid var(--void-border);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--void-muted);
}

.status-line[data-state="ok"] {
  color: var(--void-accent);
  border-color: rgba(77, 255, 179, 0.42);
}

.status-line[data-state="error"] {
  color: var(--void-error);
  border-color: rgba(255, 111, 135, 0.45);
}

@media (max-width: 720px) {
  .protocol-shell {
    padding: 22px;
  }

  .coin-container {
    width: 140px;
    height: 140px;
  }
}