:root {
  --bg-1: #07151c;
  --bg-2: #16343d;
  --panel: rgba(7, 24, 31, 0.82);
  --panel-strong: rgba(9, 20, 28, 0.92);
  --line: rgba(162, 226, 214, 0.18);
  --text: #eef8f4;
  --muted: #a4c6bf;
  --accent: #ffd166;
  --accent-2: #7ae7c7;
  --x-color: #ff8a65;
  --o-color: #7ae7c7;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
  --radius: 28px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(255, 209, 102, 0.18), transparent 28%),
    radial-gradient(circle at bottom right, rgba(122, 231, 199, 0.18), transparent 30%),
    linear-gradient(135deg, var(--bg-1), var(--bg-2));
  overflow-x: hidden;
}

.backdrop {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: radial-gradient(circle at center, black, transparent 85%);
  pointer-events: none;
}

.shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 40px;
  display: grid;
  gap: 18px;
  grid-template-columns: 1.1fr 0.95fr;
}

.card {
  position: relative;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(17, 34, 43, 0.88), var(--panel-strong));
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.hero {
  min-height: 280px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hero h1,
.room h2,
.lobby h2 {
  margin: 0;
  font-size: clamp(2.2rem, 4vw, 4rem);
  line-height: 0.95;
  letter-spacing: 0.02em;
}

.eyebrow {
  margin: 0 0 12px;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--accent);
  font-size: 0.78rem;
}

.lead,
.panel-header p,
.note,
.legend,
.player-card p,
.toggle small {
  color: var(--muted);
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.hero-tags span,
.legend,
.status-panel,
.player-card,
.field input,
.toggle,
button {
  border-radius: 18px;
}

.hero-tags span {
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.stack {
  display: grid;
  gap: 14px;
}

.panel-header h2 {
  font-size: 1.7rem;
  margin-bottom: 6px;
}

.field {
  display: grid;
  gap: 8px;
  font-size: 0.95rem;
}

.field span,
.toggle strong {
  font-weight: 700;
}

.field input {
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 15px 16px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s ease, transform 0.2s ease, background 0.2s ease;
}

.field input:focus {
  border-color: rgba(255, 209, 102, 0.7);
  background: rgba(255, 255, 255, 0.09);
  transform: translateY(-1px);
}

.toggle {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.toggle input {
  margin-top: 4px;
  inline-size: 20px;
  block-size: 20px;
  accent-color: var(--accent);
}

.divider {
  margin: 18px 0;
  display: grid;
  place-items: center;
  position: relative;
}

.divider::before {
  content: "";
  position: absolute;
  inset: 50% 0 auto;
  border-top: 1px solid var(--line);
}

.divider span {
  position: relative;
  z-index: 1;
  padding: 0 12px;
  background: linear-gradient(180deg, rgba(17, 34, 43, 0.88), var(--panel-strong));
  color: var(--muted);
}

button {
  border: 0;
  padding: 14px 18px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, opacity 0.18s ease;
}

button:hover {
  transform: translateY(-1px);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.primary {
  color: #102025;
  background: linear-gradient(135deg, var(--accent), #ffec99);
  box-shadow: 0 10px 24px rgba(255, 209, 102, 0.2);
}

.secondary {
  color: var(--text);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.ghost {
  color: var(--muted);
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.hidden {
  display: none !important;
}

.room {
  grid-column: span 2;
}

.room-top,
.players-grid,
.share-grid,
.room-footer {
  display: grid;
  gap: 14px;
}

.room-top {
  grid-template-columns: 1fr auto;
  align-items: center;
}

.share-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-bottom: 16px;
}

.network-hint {
  margin: -4px 0 18px;
  padding: 12px 14px;
  border-radius: 18px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.status-panel {
  padding: 14px 16px;
  margin-bottom: 18px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 1rem;
}

.players-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-bottom: 20px;
}

.player-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.05);
}

.player-card h3 {
  margin: 0 0 6px;
  font-size: 1.15rem;
}

.player-card p {
  margin: 0;
}

.player-card.current-player {
  border-color: rgba(255, 209, 102, 0.55);
  box-shadow: 0 0 0 1px rgba(255, 209, 102, 0.2) inset;
}

.player-symbol {
  display: grid;
  place-items: center;
  width: 58px;
  height: 58px;
  border-radius: 18px;
  font-size: 1.9rem;
  font-weight: 900;
  background: rgba(255, 255, 255, 0.05);
}

.player-symbol-x {
  color: var(--x-color);
}

.player-symbol-o {
  color: var(--o-color);
}

.board-wrap {
  display: grid;
  place-items: center;
  margin-bottom: 18px;
}

.board {
  width: min(100%, 540px);
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(3, minmax(90px, 1fr));
}

.cell {
  position: relative;
  aspect-ratio: 1 / 1;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02)),
    rgba(10, 23, 29, 0.92);
  color: var(--text);
  font-size: clamp(2.8rem, 8vw, 4.4rem);
  font-weight: 900;
}

.cell::after {
  content: "";
  position: absolute;
  inset: 8px;
  border-radius: 22px;
  border: 1px solid transparent;
  pointer-events: none;
}

.cell-x {
  color: var(--x-color);
}

.cell-o {
  color: var(--o-color);
}

.cell-hint::after {
  border-color: rgba(255, 209, 102, 0.92);
  box-shadow: 0 0 0 2px rgba(255, 209, 102, 0.24);
  animation: pulse 1.3s ease-in-out infinite alternate;
}

.cell-winning {
  background:
    linear-gradient(180deg, rgba(255, 209, 102, 0.24), rgba(255, 255, 255, 0.05)),
    rgba(10, 23, 29, 0.92);
}

.hint-badge {
  position: absolute;
  left: 12px;
  bottom: 12px;
  padding: 5px 8px;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: #1b252b;
  background: var(--accent);
  border-radius: 999px;
}

.room-footer {
  grid-template-columns: 1fr auto;
  align-items: center;
}

.legend {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.legend-dot {
  width: 12px;
  height: 12px;
  border-radius: 999px;
}

.legend-dot-hint {
  background: var(--accent);
  box-shadow: 0 0 0 5px rgba(255, 209, 102, 0.16);
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  padding: 14px 18px;
  border-radius: 18px;
  background: rgba(8, 18, 25, 0.94);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow);
}

@keyframes pulse {
  from {
    transform: scale(1);
    opacity: 0.7;
  }

  to {
    transform: scale(1.02);
    opacity: 1;
  }
}

@media (max-width: 980px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .room {
    grid-column: span 1;
  }
}

@media (max-width: 680px) {
  .card {
    padding: 18px;
    border-radius: 22px;
  }

  .share-grid,
  .players-grid,
  .room-footer {
    grid-template-columns: 1fr;
  }

  .room-top {
    grid-template-columns: 1fr;
  }

  .board {
    gap: 10px;
  }

  .cell {
    border-radius: 22px;
  }
}

.shell-lobby {
  align-items: start;
}

.shell-room {
  grid-template-columns: 1fr;
}

.room-page .room {
  grid-column: span 1;
}

.room-headline {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3.4rem);
}

.top-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.saved-room {
  margin-bottom: 18px;
  padding: 18px;
  background: rgba(255, 255, 255, 0.04);
}

.saved-room h3 {
  margin: 0 0 10px;
  font-size: 1.4rem;
}

.stack-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.room-standalone {
  min-height: calc(100vh - 56px);
}

.shell-room {
  width: min(1320px, calc(100% - 32px));
}

.small-action {
  min-width: 104px;
  padding: 12px 16px;
}

.room-identity {
  min-width: 0;
}

.room-stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 24px;
  align-items: start;
}

.board-stage {
  display: grid;
  gap: 16px;
}

.room-sidebar {
  display: grid;
  gap: 16px;
  align-content: start;
}

.status-panel-compact {
  width: min(100%, 620px);
  margin: 0 auto;
  text-align: center;
}

.players-grid-compact {
  grid-template-columns: 1fr;
  margin-bottom: 0;
}

.player-card-compact {
  padding: 14px;
}

.room-footer-compact {
  grid-template-columns: 1fr;
  align-items: stretch;
}

.legend-compact {
  font-size: 0.92rem;
  line-height: 1.4;
}

.room-standalone .board-wrap {
  margin: 0;
}

.room-standalone .board {
  width: min(100%, 680px);
  gap: 14px;
}

@media (max-width: 1100px) {
  .room-stage {
    grid-template-columns: 1fr;
  }

  .room-sidebar {
    order: -1;
  }

  .players-grid-compact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .top-actions {
    justify-content: stretch;
  }

  .small-action {
    flex: 1 1 calc(50% - 10px);
  }

  .players-grid-compact {
    grid-template-columns: 1fr;
  }
}