:root {
  color-scheme: dark;
  font-family: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
  font-synthesis: none;
  --accent: #5e11d1;
  --focus-ring: #bd9cff;
  --surface: #2d2d2d;
  --ink: rgba(255, 255, 255, 0.8);
  --ink-strong: rgba(255, 248, 231, 0.9);
  --ink-on-accent: rgba(255, 255, 255, 0.9);
  --ink-muted: rgba(255, 255, 255, 0.5);
  --ink-dim: rgba(255, 255, 255, 0.2);
  --border: rgba(255, 251, 235, 0.15);
  --surface-hover: rgba(255, 255, 255, 0.05);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-width: 320px;
  min-height: 100%;
  margin: 0;
  background: var(--surface);
  color: var(--ink);
}

body,
button,
input,
a,
summary {
  font: inherit;
}

a[href],
button:not(:disabled),
summary {
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
}

.landing-shell {
  display: flex;
  min-height: 100svh;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
}

.landing-panel {
  width: 100%;
  max-width: 384px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--ink-muted);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  color: var(--ink-strong);
  font-size: 1.12rem;
  font-weight: 400;
}

.join-copy {
  margin: 6px 0 0;
  color: var(--ink-muted);
  font-size: 0.75rem;
  line-height: 1.65;
}

.join-form {
  margin-top: 22px;
}

.join-form label {
  display: block;
  margin-bottom: 7px;
  color: var(--ink-muted);
  font-size: 0.75rem;
}

.room-code-input {
  width: 100%;
  height: 68px;
  padding: 0 16px 0 24px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: transparent;
  color: var(--ink-strong);
  font-family: ui-monospace, "Cascadia Mono", monospace;
  font-size: 1.15rem;
  letter-spacing: 0.42em;
  text-align: center;
  text-transform: uppercase;
  transition: border-color 160ms ease, background-color 160ms ease;
}

.room-code-input:hover {
  background: var(--surface-hover);
}

.room-code-input:focus {
  border-color: var(--focus-ring);
}

.field-hint {
  min-height: 32px;
  margin: 0;
  padding-top: 7px;
  color: var(--ink-muted);
  font-size: 0.75rem;
}

.primary-button,
.secondary-button {
  display: flex;
  width: 100%;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  font-size: 0.82rem;
  letter-spacing: 0.05em;
  text-decoration: none;
  transition: filter 160ms ease, color 160ms ease, background-color 160ms ease;
}

.primary-button {
  border: 0;
  background: var(--accent);
  color: var(--ink-on-accent);
}

.primary-button:hover {
  filter: brightness(1.1);
}

.primary-button:active {
  filter: brightness(0.9);
}

.secondary-button {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--ink-muted);
}

.secondary-button:hover {
  background: var(--surface-hover);
  color: var(--ink);
}

.divider {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  margin: 20px 0;
  gap: 13px;
}

.divider span {
  height: 1px;
  background: var(--border);
}

.divider strong {
  color: var(--ink-muted);
  font-size: 0.75rem;
  font-weight: 400;
}

.privacy-copy {
  margin: 24px 0 0;
  color: var(--ink-muted);
  font-size: 0.75rem;
  line-height: 1.7;
  text-align: center;
}

.footer-links {
  display: flex;
  min-height: 44px;
  align-items: flex-start;
  justify-content: center;
  margin-top: 12px;
  color: var(--ink-dim);
  gap: 8px;
  font-size: 0.75rem;
}

.footer-links a,
.about-details summary {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--ink-muted);
  text-decoration: underline;
  text-decoration-color: var(--ink-dim);
  text-underline-offset: 4px;
}

.footer-links > span {
  line-height: 44px;
}

.footer-links a:hover,
.about-details summary:hover {
  color: var(--ink);
  text-decoration-color: var(--ink-muted);
}

.about-details {
  max-width: 250px;
  text-align: center;
}

.about-details summary {
  list-style: none;
}

.about-details summary::-webkit-details-marker {
  display: none;
}

.about-details p {
  margin: 10px 0 0;
  color: var(--ink-muted);
  line-height: 1.6;
}

.boot-progress {
  display: flex;
  align-items: center;
  margin-top: 22px;
  color: var(--ink-muted);
  gap: 10px;
  font-size: 0.75rem;
}

.boot-progress::before {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  content: "";
  animation: boot-pulse 1.2s ease-in-out infinite alternate;
}

.boot-actions {
  margin-top: 24px;
}

@keyframes boot-pulse {
  from { opacity: 0.35; }
  to { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
  }
}