:root {
  --background-start: #061224;
  --background-end: #0b3a7a;
  --surface-1: rgba(10, 20, 38, 0.86);
  --surface-2: rgba(12, 26, 48, 0.9);
  --border: rgba(255, 255, 255, 0.08);
  --shadow: 0 22px 60px rgba(0, 0, 0, 0.45);
  --text: #eaf2ff;
  --text-muted: rgba(234, 242, 255, 0.72);
  --accent: #4aa3ff;
  --accent-strong: #1e7fff;
  --danger: #ff5b6e;
  --success: #24d18f;
  --radius: 18px;
  --radius-sm: 12px;
  --topbar-height: 68px;
  --container-padding: 22px;
}
* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  font-family:
    Inter,
    system-ui,
    -apple-system,
    Segoe UI,
    Roboto,
    Arial,
    sans-serif;
  color: var(--text);
  background:
    radial-gradient(
      1200px 600px at 80% -10%,
      rgba(74, 163, 255, 0.25),
      transparent 55%
    ),
    linear-gradient(165deg, var(--background-start), var(--background-end));
  overflow: hidden;
}
a {
  color: var(--accent);
  text-decoration: none;
}
a:visited {
  color: var(--accent);
}
a:hover {
  text-decoration: underline;
}
.hidden {
  display: none !important;
}
.page {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}
.topbar {
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--container-padding);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  background: linear-gradient(180deg, rgba(4, 10, 18, 0.7), rgba(4, 10, 18, 0));
}
.topbar-left,
.topbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
}
.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(
    160deg,
    rgba(74, 163, 255, 0.25),
    rgba(30, 127, 255, 0.05)
  );
  border: 1px solid rgba(74, 163, 255, 0.22);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  font-weight: 800;
}
.brand-title {
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.brand-subline {
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.1;
}
.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 22px var(--container-padding);
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
}
.container-game {
  align-items: stretch;
}
.card {
  width: 100%;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
  min-height: 0;
}
.maintenance-card {
  max-width: 760px;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(74, 163, 255, 0.12);
  border: 1px solid rgba(74, 163, 255, 0.18);
  color: rgba(234, 242, 255, 0.9);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.headline {
  margin: 16px 0 0;
  font-size: 40px;
  line-height: 1.1;
  letter-spacing: -0.03em;
}
.lead {
  margin: 14px 0 0;
  color: var(--text-muted);
  font-size: 16px;
  line-height: 1.6;
  max-width: 62ch;
}
.meta {
  margin: 14px 0 0;
  color: var(--text-muted);
  font-size: 14px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.meta-values {
  color: rgba(234, 242, 255, 0.85);
}
.countdown {
  margin: 22px 0 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}
.countdown-tile {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 16px;
  padding: 14px 14px 12px;
}
.countdown-value {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.countdown-label {
  margin-top: 6px;
  color: var(--text-muted);
  font-size: 12px;
}
.countdown-complete {
  margin: 22px 0 0;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  border-radius: 16px;
  background: rgba(36, 209, 143, 0.08);
  border: 1px solid rgba(36, 209, 143, 0.18);
}
.checkmark {
  width: 34px;
  height: 34px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(36, 209, 143, 0.12);
  border: 1px solid rgba(36, 209, 143, 0.22);
  font-size: 20px;
}
.complete-text {
  color: rgba(234, 242, 255, 0.9);
  font-weight: 600;
}
.maintenance-footer {
  margin-top: 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.footer-text {
  color: var(--text-muted);
  font-size: 14px;
}
.language-switcher {
  display: flex;
  gap: 8px;
  align-items: center;
}
.button,
.language-button {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.04);
  color: rgba(234, 242, 255, 0.92);
  border-radius: 12px;
  height: 40px;
  padding: 0 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  text-decoration: none;
}
.button:hover,
.language-button:hover {
  border-color: rgba(74, 163, 255, 0.35);
  background: rgba(74, 163, 255, 0.08);
}
.button:focus-visible,
.language-button:focus-visible {
  outline: none;
  box-shadow: 0 0 0 4px rgba(74, 163, 255, 0.18);
}
.button:active,
.language-button:active {
  transform: translateY(1px);
}
.button-primary {
  background: linear-gradient(
    180deg,
    rgba(30, 127, 255, 0.9),
    rgba(30, 127, 255, 0.68)
  );
  border-color: rgba(30, 127, 255, 0.75);
}
.button-primary:hover {
  background: linear-gradient(
    180deg,
    rgba(30, 127, 255, 0.95),
    rgba(30, 127, 255, 0.74)
  );
}
.button-ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.1);
}
.button-icon {
  padding: 0;
  width: 40px;
}
.language-button {
  height: 36px;
  padding: 0 12px;
  border-radius: 999px;
  font-size: 13px;
}
.language-button-active {
  background: rgba(74, 163, 255, 0.18);
  border-color: rgba(74, 163, 255, 0.42);
}
.text-input {
  width: 100%;
  height: 44px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(0, 0, 0, 0.2);
  color: rgba(234, 242, 255, 0.94);
  padding: 0 14px;
  font-weight: 600;
}
.text-input:focus {
  outline: none;
  border-color: rgba(74, 163, 255, 0.55);
  box-shadow: 0 0 0 4px rgba(74, 163, 255, 0.15);
}
.text-input::placeholder {
  color: rgba(234, 242, 255, 0.45);
  font-weight: 500;
}
.game-card {
  height: calc(100dvh - var(--topbar-height) - 44px);
  padding: 18px;
}
.game-grid {
  height: 100%;
  display: grid;
  grid-template-columns: 360px minmax(0, 1fr);
  gap: 16px;
  min-height: 0;
}
.leaderboard-panel {
  background: var(--surface-2);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.panel-title {
  margin: 0;
  font-size: 16px;
  letter-spacing: -0.01em;
}
.leaderboard-content {
  margin-top: 10px;
  flex: 1;
  min-height: 0;
  overflow: auto;
}
.leaderboard-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.leaderboard-item {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr) 92px;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
}
.leaderboard-rank {
  color: rgba(234, 242, 255, 0.7);
  font-weight: 700;
  font-size: 13px;
}
.leaderboard-name {
  font-weight: 650;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.leaderboard-score {
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-weight: 750;
}
.leaderboard-empty {
  color: var(--text-muted);
  padding: 12px 10px;
}
.game-panel {
  background: transparent;
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 0;
}
.score-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.score-box {
  flex: 1;
  min-width: 170px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 16px;
  padding: 12px 14px;
}
.score-label {
  color: var(--text-muted);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.score-value {
  margin-top: 6px;
  font-size: 24px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}
.controls-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.name-controls {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  flex-wrap: wrap;
  width: 100%;
}
.name-controls .text-input {
  flex: 1;
  min-width: 220px;
}
.button-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.hint {
  color: var(--text-muted);
  font-size: 14px;
}
.board-area {
  flex: 1;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px;
}
.board {
  --board-size: 420px;
  --board-gap: 12px;
  width: var(--board-size);
  height: var(--board-size);
  position: relative;
  border-radius: 18px;
  background: rgba(0, 0, 0, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  overflow: hidden;
}
.board-grid {
  position: absolute;
  inset: 14px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--board-gap);
}
.cell {
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid rgba(255, 255, 255, 0.05);
}
.tile-layer {
  position: absolute;
  inset: 14px;
}
.tile {
  position: absolute;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 850;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  color: rgba(234, 242, 255, 0.95);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.25);
  animation: tile-pop 120ms ease-out;
}
@keyframes tile-pop {
  from {
    opacity: 0.65;
    transform: scale(0.92);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}
.tile--2 {
  background: rgba(255, 255, 255, 0.14);
}
.tile--4 {
  background: rgba(74, 163, 255, 0.22);
}
.tile--8 {
  background: rgba(74, 163, 255, 0.3);
}
.tile--16 {
  background: rgba(30, 127, 255, 0.4);
}
.tile--32 {
  background: rgba(30, 127, 255, 0.52);
}
.tile--64 {
  background: rgba(30, 127, 255, 0.66);
}
.tile--128 {
  background: rgba(74, 163, 255, 0.38);
}
.tile--256 {
  background: rgba(74, 163, 255, 0.48);
}
.tile--512 {
  background: rgba(74, 163, 255, 0.6);
}
.tile--1024 {
  background: rgba(74, 163, 255, 0.72);
}
.tile--2048 {
  background: rgba(36, 209, 143, 0.38);
  border: 1px solid rgba(36, 209, 143, 0.35);
}
.toast-container {
  position: fixed;
  top: 18px;
  right: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 50;
  max-width: min(360px, calc(100vw - 36px));
}
.toast {
  border-radius: 14px;
  padding: 12px 14px;
  background: rgba(12, 26, 48, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
.toast-title {
  font-weight: 800;
  font-size: 13px;
  letter-spacing: -0.01em;
}
.toast-message {
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.4;
}
.toast-info {
  border-color: rgba(74, 163, 255, 0.2);
}
.toast-success {
  border-color: rgba(36, 209, 143, 0.24);
}
.toast-error {
  border-color: rgba(255, 91, 110, 0.24);
}
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 60;
  padding: 18px;
}
.modal {
  width: min(520px, 100%);
  background: rgba(10, 20, 38, 0.96);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 18px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
  padding: 16px;
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 4px 2px 10px;
}
.modal-title {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.modal-body {
  padding: 6px 2px 4px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.modal-description {
  color: rgba(234, 242, 255, 0.85);
  font-size: 14px;
}
.modal-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.field-label {
  color: var(--text-muted);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  padding: 12px 2px 2px;
  flex-wrap: wrap;
}
@media (max-width: 960px) {
  .container {
    padding: 18px var(--container-padding);
  }
  .headline {
    font-size: 34px;
  }
  .countdown {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .game-card {
    height: calc(100dvh - var(--topbar-height) - 36px);
  }
  .game-grid {
    grid-template-columns: 1fr;
    grid-template-rows: auto minmax(0, 1fr);
  }
  .leaderboard-panel {
    max-height: 220px;
  }
  .score-box {
    min-width: 160px;
  }
}
@media (max-width: 420px) {
  .headline {
    font-size: 30px;
  }
  .card {
    padding: 22px;
  }
  .board {
    --board-size: 320px;
  }
}