:root {
  --bg: #07090d;
  --bg-card: #141a24;
  --text: #eef2f7;
  --text-muted: #8b97a8;
  --green: #b8ff2e;
  --orange: #ff9f1a;
  --pink: #ff4d9d;
  --border: rgba(255, 255, 255, 0.08);
  --radius: 20px;
  --radius-sm: 14px;
  --font: "Manrope", system-ui, sans-serif;
  --font-display: "Unbounded", "Manrope", sans-serif;
  --cell: clamp(44px, 11vw, 68px);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
  --ttt-x-color: #b8ff2e;
  --ttt-o-color: #ff9f1a;
  --ttt-x-bg: rgba(184, 255, 46, 0.12);
  --ttt-o-bg: rgba(255, 159, 26, 0.12);
  --ttt-board-bg: var(--bg-card);
  --ttt-board-border: var(--border);
  --ttt-cell-bg: rgba(0, 0, 0, 0.25);
  --ttt-cell-border: var(--border);
  --ttt-hover-border: rgba(184, 255, 46, 0.35);
  --ttt-hover-bg: rgba(184, 255, 46, 0.06);
  --ttt-win-border: rgba(184, 255, 46, 0.55);
  --ttt-win-bg: rgba(184, 255, 46, 0.12);
}

.bg-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
}

.bg-glow--green {
  width: 520px;
  height: 520px;
  top: -120px;
  left: -80px;
  background: rgba(184, 255, 46, 0.12);
}

.bg-glow--orange {
  width: 480px;
  height: 480px;
  right: -100px;
  top: 30%;
  background: rgba(255, 159, 26, 0.1);
}

.bg-grid {
  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: 48px 48px;
  mask-image: radial-gradient(ellipse at center, black 20%, transparent 75%);
  pointer-events: none;
  z-index: 0;
}

.header,
.layout,
.modal {
  position: relative;
  z-index: 1;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 980px;
  margin: 0 auto;
  padding: 20px 20px 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.logo__mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--green), var(--orange));
  color: #0a0f14;
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 800;
}

.logo__title {
  display: block;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
}

.logo__subtitle {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: 999px;
  font: inherit;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s, background 0.15s, border-color 0.15s;
}

.btn--primary {
  background: var(--green);
  color: #0a0f14;
}

.btn--primary:hover {
  transform: translateY(-1px);
  filter: brightness(1.05);
}

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

.btn--ghost:hover {
  border-color: rgba(184, 255, 46, 0.35);
  color: var(--green);
}

.btn--block {
  width: 100%;
}

.layout {
  display: grid;
  grid-template-columns: minmax(240px, 280px) 1fr;
  gap: 28px;
  max-width: 980px;
  margin: 0 auto;
  padding: 24px 20px 48px;
  align-items: start;
}

.panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.panel__block {
  padding: 18px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
}

.panel__title {
  margin: 0 0 12px;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.panel__hint {
  margin: 12px 0 0;
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.panel__user {
  margin: 8px 0 0;
  font-size: 0.85rem;
  color: var(--green);
  font-weight: 600;
}

.wins-stats {
  display: grid;
  gap: 12px;
}

.wins-stat {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.2);
}

.wins-stat__mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  font-size: 1.4rem;
  font-weight: 800;
  line-height: 1;
}

.wins-stat__mark--x {
  background: var(--ttt-x-bg);
  color: var(--ttt-x-color);
}

.wins-stat__mark--o {
  background: var(--ttt-o-bg);
  color: var(--ttt-o-color);
}

.wins-stat__label {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.wins-stat__value {
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--text);
}

.side-picker,
.mode-picker,
.difficulty-picker {
  display: grid;
  gap: 10px;
}

.side-picker,
.mode-picker {
  grid-template-columns: 1fr 1fr;
  margin-bottom: 12px;
}

.difficulty-picker {
  grid-template-columns: repeat(3, 1fr);
  margin-bottom: 12px;
}

.side-picker__btn,
.mode-picker__btn,
.difficulty-picker__btn {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-muted);
  font: inherit;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, color 0.15s;
}

.side-picker__btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 14px 10px;
  font-size: 0.85rem;
  font-weight: 700;
}

.mode-picker__btn,
.difficulty-picker__btn {
  padding: 12px 10px;
  font-size: 0.82rem;
  font-weight: 700;
}

.difficulty-picker__btn {
  padding: 10px 8px;
  font-size: 0.78rem;
}

.side-picker__btn--active,
.mode-picker__btn--active,
.difficulty-picker__btn--active {
  border-color: rgba(184, 255, 46, 0.45);
  background: rgba(184, 255, 46, 0.08);
  color: var(--text);
}

.side-picker__mark {
  font-size: 2rem;
  line-height: 1;
  font-weight: 800;
}

.side-picker__mark--x {
  color: var(--ttt-x-color);
}

.side-picker__mark--o {
  color: var(--ttt-o-color);
}

.setup__note {
  margin: 0 0 14px;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
}

.friend-picker {
  display: grid;
  gap: 8px;
  max-height: 220px;
  overflow-y: auto;
  margin-bottom: 12px;
}

.friend-picker__empty {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
  padding: 12px 8px;
}

.friend-picker__btn {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
  font: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  transition: border-color 0.15s, background 0.15s;
}

.friend-picker__btn:hover {
  border-color: rgba(184, 255, 46, 0.35);
  background: rgba(184, 255, 46, 0.06);
}

.friend-picker__avatar {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  font-size: 0.8rem;
  font-weight: 800;
  overflow: hidden;
  flex-shrink: 0;
}

.friend-picker__avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.setup__message {
  margin: 0 0 12px;
  font-size: 0.85rem;
  color: var(--orange);
  text-align: center;
}

.setup__message--success {
  color: var(--green);
}

.board-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding-top: 8px;
}

.board {
  display: grid;
  grid-template-columns: repeat(5, var(--cell));
  gap: 7px;
  padding: 14px;
  border-radius: var(--radius);
  background: var(--ttt-board-bg);
  border: 1px solid var(--ttt-board-border);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
}

.board[hidden] {
  display: none;
}

.cell {
  width: var(--cell);
  height: var(--cell);
  border: 1px solid var(--ttt-cell-border);
  border-radius: 12px;
  background: var(--ttt-cell-bg);
  font-size: calc(var(--cell) * 0.52);
  font-weight: 800;
  line-height: 1;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
}

.cell:hover:not(:disabled) {
  border-color: var(--ttt-hover-border);
  background: var(--ttt-hover-bg);
  transform: translateY(-2px);
}

.cell:disabled {
  cursor: default;
}

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

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

.cell--win {
  border-color: var(--ttt-win-border);
  background: var(--ttt-win-bg);
  animation: pulse-win 0.6s ease;
}

@keyframes pulse-win {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.04);
  }
}

.board-status {
  min-height: 1.4em;
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-muted);
  text-align: center;
}

.board-wrap__restart[hidden],
.modal[hidden] {
  display: none;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 20px;
}

.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: blur(4px);
}

.modal__dialog {
  position: relative;
  width: min(420px, 100%);
  padding: 28px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  text-align: center;
}

.modal__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
}

.modal__text {
  margin: 0 0 20px;
  color: var(--text-muted);
}

.modal__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.tool-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  margin-top: 12px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.tool-btn:hover {
  border-color: rgba(184, 255, 46, 0.35);
}

.tool-btn__icon {
  font-size: 1.1rem;
  line-height: 1;
}

body[data-ttt-bg="light"] {
  --ttt-board-bg: #ffffff;
  --ttt-board-border: rgba(15, 23, 42, 0.12);
  --ttt-cell-bg: #f5f7fa;
  --ttt-cell-border: rgba(15, 23, 42, 0.1);
}

body[data-ttt-bg="classic"] {
  --ttt-board-bg: #c0c0c0;
  --ttt-board-border: #7b7b7b;
  --ttt-cell-bg: #d9d9d9;
  --ttt-cell-border: #9a9a9a;
}

body[data-ttt-accent="blue"] {
  --ttt-hover-border: rgba(92, 141, 255, 0.4);
  --ttt-hover-bg: rgba(92, 141, 255, 0.08);
  --ttt-win-border: rgba(92, 141, 255, 0.55);
  --ttt-win-bg: rgba(92, 141, 255, 0.12);
}

body[data-ttt-accent="orange"] {
  --ttt-hover-border: rgba(255, 159, 26, 0.4);
  --ttt-hover-bg: rgba(255, 159, 26, 0.08);
  --ttt-win-border: rgba(255, 159, 26, 0.55);
  --ttt-win-bg: rgba(255, 159, 26, 0.12);
}

body[data-ttt-accent="purple"] {
  --ttt-hover-border: rgba(199, 125, 255, 0.4);
  --ttt-hover-bg: rgba(199, 125, 255, 0.08);
  --ttt-win-border: rgba(199, 125, 255, 0.55);
  --ttt-win-bg: rgba(199, 125, 255, 0.12);
}

body[data-ttt-accent="pink"] {
  --ttt-hover-border: rgba(255, 77, 157, 0.4);
  --ttt-hover-bg: rgba(255, 77, 157, 0.08);
  --ttt-win-border: rgba(255, 77, 157, 0.55);
  --ttt-win-bg: rgba(255, 77, 157, 0.12);
}

body[data-ttt-x-color="blue"] { --ttt-x-color: #5c8dff; --ttt-x-bg: rgba(92, 141, 255, 0.12); }
body[data-ttt-x-color="pink"] { --ttt-x-color: #ff4d9d; --ttt-x-bg: rgba(255, 77, 157, 0.12); }
body[data-ttt-x-color="purple"] { --ttt-x-color: #c77dff; --ttt-x-bg: rgba(199, 125, 255, 0.12); }
body[data-ttt-x-color="orange"] { --ttt-x-color: #ff9f1a; --ttt-x-bg: rgba(255, 159, 26, 0.12); }
body[data-ttt-x-color="red"] { --ttt-x-color: #ff5c7a; --ttt-x-bg: rgba(255, 92, 122, 0.12); }

body[data-ttt-o-color="green"] { --ttt-o-color: #b8ff2e; --ttt-o-bg: rgba(184, 255, 46, 0.12); }
body[data-ttt-o-color="blue"] { --ttt-o-color: #5c8dff; --ttt-o-bg: rgba(92, 141, 255, 0.12); }
body[data-ttt-o-color="pink"] { --ttt-o-color: #ff4d9d; --ttt-o-bg: rgba(255, 77, 157, 0.12); }
body[data-ttt-o-color="purple"] { --ttt-o-color: #c77dff; --ttt-o-bg: rgba(199, 125, 255, 0.12); }
body[data-ttt-o-color="yellow"] { --ttt-o-color: #ffd24d; --ttt-o-bg: rgba(255, 210, 77, 0.14); }

@media (max-width: 860px) {
  .layout {
    grid-template-columns: 1fr;
    max-width: 520px;
  }

  .panel--side {
    order: 2;
  }

  .board-wrap {
    order: 1;
  }

  :root {
    --cell: clamp(42px, 16vw, 58px);
  }
}

@media (max-width: 380px) {
  :root {
    --cell: clamp(38px, 15vw, 50px);
  }
}