:root {
  --bg0: #0b1220;
  --bg1: #121c2e;
  --ink: #e8eef8;
  --muted: #8fa3bf;
  --accent: #3dd68c;
  --accent-ink: #062416;
  --line: rgba(61, 214, 140, 0.22);
  --danger: #ff7b7b;
  --font-display: "Syne", "IBM Plex Sans", sans-serif;
  --font-ui: "IBM Plex Sans", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  color: var(--ink);
  font-family: var(--font-ui);
  background: var(--bg0);
}

body {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 1.25rem;
  overflow-x: hidden;
}

.v2-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse 80% 55% at 15% 10%, rgba(0, 32, 178, 0.45), transparent 55%),
    radial-gradient(ellipse 70% 50% at 90% 80%, rgba(61, 214, 140, 0.18), transparent 50%),
    linear-gradient(165deg, #070b14 0%, #0f1a2e 45%, #0a1018 100%);
  pointer-events: none;
}

.v2-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.07;
  background-image:
    linear-gradient(rgba(232, 238, 248, 0.35) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232, 238, 248, 0.35) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 20%, transparent 75%);
}

.v2-shell {
  position: relative;
  z-index: 1;
  width: min(28rem, 100%);
  text-align: center;
  animation: v2-in 0.55s ease-out both;
}

@keyframes v2-in {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: none; }
}

.v2-brand {
  margin-bottom: 1.1rem;
}

.v2-logo {
  width: min(220px, 70vw);
  height: auto;
  filter: drop-shadow(0 8px 24px rgba(0, 0, 0, 0.35));
}

.v2-headline {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 5vw, 2rem);
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.v2-lead {
  margin: 0.55rem 0 0;
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.45;
}

.v2-room {
  margin: 1.35rem 0 1.2rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: color-mix(in srgb, var(--bg1) 78%, transparent);
  backdrop-filter: blur(8px);
  animation: v2-pulse-border 3.2s ease-in-out infinite;
}

@keyframes v2-pulse-border {
  0%, 100% { border-color: rgba(61, 214, 140, 0.22); }
  50% { border-color: rgba(61, 214, 140, 0.55); }
}

.v2-room-label {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.v2-room-name {
  margin: 0.35rem 0 0.2rem;
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 600;
  color: var(--accent);
}

.v2-room-meta {
  margin: 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.v2-form {
  display: grid;
  gap: 0.75rem;
}

.v2-cta {
  appearance: none;
  border: 0;
  border-radius: 8px;
  padding: 0.95rem 1.2rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--accent-ink);
  background: var(--accent);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease, filter 0.15s ease;
  box-shadow: 0 10px 28px rgba(61, 214, 140, 0.28);
}

.v2-cta:hover:not(:disabled) {
  transform: translateY(-1px);
  filter: brightness(1.05);
}

.v2-cta:active:not(:disabled) {
  transform: translateY(1px);
}

.v2-cta:disabled {
  opacity: 0.7;
  cursor: wait;
}

.v2-nick-mode {
  margin: 0;
  padding: 0;
  border: 0;
  text-align: left;
}

.v2-nick-legend {
  padding: 0;
  margin: 0 0 0.55rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
  text-align: center;
  width: 100%;
}

.v2-nick-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.45rem;
  padding: 0.3rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: rgba(7, 11, 20, 0.45);
}

.v2-nick-tab {
  display: block;
  cursor: pointer;
  margin: 0;
}

.v2-nick-tab input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.v2-nick-tab span {
  display: block;
  text-align: center;
  padding: 0.65rem 0.4rem;
  border-radius: 7px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--muted);
  transition: background 0.15s ease, color 0.15s ease;
}

.v2-nick-tab input:checked + span {
  background: color-mix(in srgb, var(--accent) 22%, transparent);
  color: var(--ink);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 45%, transparent);
}

.v2-nick-tab input:focus-visible + span {
  outline: 2px solid color-mix(in srgb, var(--accent) 55%, transparent);
  outline-offset: 1px;
}

.v2-nick-panel {
  text-align: left;
}

.v2-nick-panel[hidden] {
  display: none !important;
}

.v2-nick-label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.82rem;
  color: var(--muted);
}

.v2-nick-label input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 0.7rem 0.8rem;
  background: rgba(7, 11, 20, 0.65);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 1rem;
}

.v2-nick-label input:focus {
  outline: 2px solid color-mix(in srgb, var(--accent) 55%, transparent);
  outline-offset: 1px;
}

.v2-nick-rules {
  margin: 0.45rem 0 0;
  font-size: 0.72rem;
  line-height: 1.35;
  color: color-mix(in srgb, var(--muted) 88%, transparent);
}

.v2-nick-rules code {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--ink);
}

.v2-random-label {
  margin: 0;
  text-align: center;
  font-size: 0.82rem;
  color: var(--muted);
}

.v2-random-nick {
  margin: 0.35rem 0 0.55rem;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.02em;
}

.v2-reroll {
  appearance: none;
  display: block;
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.4rem 0.75rem;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
}

.v2-reroll:hover {
  color: var(--ink);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--line));
}

.v2-hint {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.4;
  color: color-mix(in srgb, var(--muted) 90%, transparent);
}

.v2-err {
  margin: 0;
  padding: 0.55rem 0.7rem;
  border-radius: 7px;
  background: color-mix(in srgb, var(--danger) 16%, transparent);
  color: #ffd0d0;
  font-size: 0.86rem;
}

.v2-foot {
  margin: 1.4rem 0 0;
  font-size: 0.86rem;
  color: var(--muted);
}

.v2-foot a {
  color: var(--accent);
  text-decoration: none;
}

.v2-foot a:hover {
  text-decoration: underline;
}

@media (max-width: 420px) {
  .v2-room {
    margin-top: 1.1rem;
  }
}

.v3-badge {
  display: inline-block;
  margin: 0 0 0.55rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--accent) 16%, transparent);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.v3-features {
  margin: 1rem auto 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.35rem;
  text-align: left;
  max-width: 22rem;
}

.v3-features li {
  position: relative;
  padding: 0.35rem 0.55rem 0.35rem 1.35rem;
  border-radius: 6px;
  background: rgba(7, 11, 20, 0.35);
  color: var(--muted);
  font-size: 0.84rem;
}

.v3-features li::before {
  content: "";
  position: absolute;
  left: 0.55rem;
  top: 0.7rem;
  width: 0.35rem;
  height: 0.35rem;
  border-radius: 50%;
  background: var(--accent);
}

.v4-shell { width: min(30rem, 100%); }

.v4-mode-tabs,
.v4-sso-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem;
  margin: 1rem 0 0.85rem;
  padding: 0.3rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: rgba(7, 11, 20, 0.45);
}

.v4-mode-tab,
.v4-sso-tab {
  appearance: none;
  border: 0;
  border-radius: 7px;
  padding: 0.7rem 0.4rem;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
}

.v4-mode-tab.active,
.v4-sso-tab.active {
  background: color-mix(in srgb, var(--accent) 22%, transparent);
  color: var(--ink);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 45%, transparent);
}

.v4-sso-form {
  display: grid;
  gap: 0.65rem;
}

.v4-social-title {
  margin: 0 0 0.55rem;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.v4-social-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.45rem;
}

.v4-social-btn {
  appearance: none;
  display: flex;
  align-items: center;
  gap: 0.55rem;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 0.7rem 0.65rem;
  background: rgba(255, 255, 255, 0.04);
  color: var(--ink);
  font: inherit;
  font-size: 0.86rem;
  font-weight: 700;
  cursor: pointer;
  text-align: left;
  transition: border-color 0.15s ease, transform 0.12s ease, opacity 0.15s ease;
}

.v4-social-btn:hover:not(:disabled) {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
  transform: translateY(-1px);
}

.v4-social-btn:disabled,
.v4-social-btn.is-soon {
  opacity: 0.55;
  cursor: not-allowed;
}

.v4-social-icon {
  flex: 0 0 1.55rem;
  width: 1.55rem;
  height: 1.55rem;
  border-radius: 6px;
  display: grid;
  place-items: center;
  font-size: 0.78rem;
  font-weight: 800;
  line-height: 1;
  background: rgba(255, 255, 255, 0.1);
}

.v4-social-label {
  display: flex;
  flex-direction: column;
  gap: 0.05rem;
  min-width: 0;
}

.v4-social-label small {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--muted);
}

.v4-social-google .v4-social-icon { background: #fff; color: #4285f4; }
.v4-social-facebook .v4-social-icon { background: #1877f2; color: #fff; }
.v4-social-instagram .v4-social-icon {
  background: linear-gradient(135deg, #f58529, #dd2a7b 50%, #8134af);
  color: #fff;
  font-size: 0.62rem;
}
.v4-social-microsoft .v4-social-icon { background: #2f2f2f; color: #00a4ef; }
.v4-social-apple .v4-social-icon { background: #111; color: #fff; }
.v4-social-apple .v4-social-icon::before { content: "A"; font-weight: 800; }
.v4-social-discord .v4-social-icon { background: #5865f2; color: #fff; }

.v4-or {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 0.55rem;
  margin: 0.95rem 0 0.35rem;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 600;
}

.v4-or::before,
.v4-or::after {
  content: "";
  height: 1px;
  background: var(--line);
}

.v4-or span { white-space: nowrap; }

@media (max-width: 420px) {
  .v4-social-grid { grid-template-columns: 1fr; }
}