:root {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { min-height: 100%; }
h1, h2, p { margin: 0; }
button, input { font: inherit; }
.hidden { display: none !important; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px 0;
  overflow-x: hidden;
  background: var(--page-bg);
  color: var(--text);
  transition: background .35s ease, color .35s ease;
}

body::before,
body::after {
  content: "";
  position: fixed;
  z-index: -1;
  pointer-events: none;
  border-radius: 999px;
  filter: blur(10px);
  opacity: var(--ambient-opacity);
  transition: background .35s ease, opacity .35s ease;
}

body::before {
  width: 360px;
  height: 360px;
  left: -120px;
  top: -100px;
  background: var(--ambient-a);
}

body::after {
  width: 420px;
  height: 420px;
  right: -150px;
  bottom: -130px;
  background: var(--ambient-b);
}

.app-shell {
  width: min(1180px, calc(100vw - 32px));
  padding: 26px 28px 24px;
  border: 1px solid var(--shell-border);
  border-radius: 28px;
  background: var(--shell-bg);
  box-shadow: var(--shell-shadow);
  backdrop-filter: blur(20px);
  transition: background .35s ease, border-color .35s ease, box-shadow .35s ease;
}

.global-controls {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 20;
  display: flex;
  gap: 10px;
}

.compact-control {
  min-width: 118px;
}

.theme-button.muted {
  opacity: .72;
}

.auth-view {
  width: min(460px, calc(100vw - 32px));
}

.login-card {
  width: 100%;
  padding: 38px;
  border: 1px solid var(--shell-border);
  border-radius: 30px;
  background: var(--shell-bg);
  box-shadow: var(--shell-shadow);
  backdrop-filter: blur(20px);
  text-align: center;
  animation: modalPop .32s cubic-bezier(.2,.9,.25,1.1);
}

.login-mark {
  width: 84px;
  height: 84px;
  margin: 0 auto 22px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  place-items: center;
  padding: 12px;
  border-radius: 26px;
  border: 1px solid var(--button-border);
  background: var(--button-soft);
  box-shadow: var(--button-shadow);
}

.mini-piece {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  box-shadow: inset 0 2px 5px rgba(255,255,255,.42), 0 6px 14px rgba(0,0,0,.2);
}

.mini-piece.red { background: radial-gradient(circle at 35% 28%, #ffb0b0 0, #ff353f 33%, #b60e25 78%); }
.mini-piece.blue { background: radial-gradient(circle at 35% 28%, #b5deff 0, #247dff 33%, #1537a8 78%); }

.login-title {
  font-size: clamp(2.6rem, 10vw, 4.3rem);
}

.login-subtitle {
  margin-top: 12px;
  color: var(--muted);
  font-size: .95rem;
}

.login-form {
  margin-top: 30px;
  display: grid;
  gap: 17px;
  text-align: left;
}

.form-field {
  display: grid;
  gap: 8px;
}

.form-field span {
  color: var(--muted);
  font-size: .76rem;
  font-weight: 850;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.form-field input {
  width: 100%;
  min-height: 50px;
  padding: 0 15px;
  border: 1px solid var(--button-border);
  border-radius: 14px;
  outline: none;
  background: var(--button-soft);
  color: var(--text);
  box-shadow: inset 0 1px rgba(255,255,255,.025);
  transition: border-color .18s ease, box-shadow .18s ease, background .18s ease;
}

.form-field input:focus {
  border-color: var(--cell-hover);
  box-shadow: 0 0 0 4px rgba(70, 151, 255, .11);
}

.login-button {
  width: 100%;
  margin-top: 4px;
}

.login-button:disabled {
  opacity: .65;
  cursor: wait;
  transform: none;
}

.login-error {
  padding: 10px 12px;
  border: 1px solid rgba(255,75,92,.28);
  border-radius: 12px;
  background: rgba(255,75,92,.08);
  color: var(--red);
  font-size: .86rem;
}

.login-footnote {
  margin-top: 20px;
  color: var(--muted);
  font-size: .72rem;
  letter-spacing: .08em;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 18px;
}

.brand-block { min-width: 0; }

h1 {
  font-size: clamp(2.2rem, 4.8vw, 4rem);
  letter-spacing: .07em;
  line-height: .95;
}

.eyebrow {
  margin-bottom: 7px;
  font-size: .7rem;
  letter-spacing: .28em;
  font-weight: 900;
  color: var(--muted);
}

.subtitle {
  margin-top: 9px;
  letter-spacing: .32em;
  text-transform: uppercase;
  font-size: .7rem;
  color: var(--muted);
}

.theme-button,
.primary-button,
.secondary-button {
  border: 0;
  cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, color .18s ease;
}

.theme-button:hover,
.primary-button:hover,
.secondary-button:hover { transform: translateY(-2px); }

.theme-button:active,
.primary-button:active,
.secondary-button:active { transform: translateY(0); }

.theme-button {
  min-width: 132px;
  min-height: 46px;
  padding: 0 15px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border: 1px solid var(--button-border);
  border-radius: 15px;
  background: var(--button-soft);
  color: var(--text);
  box-shadow: var(--button-shadow);
  font-size: .76rem;
  font-weight: 900;
  letter-spacing: .08em;
}

.theme-button-icon {
  width: 25px;
  height: 25px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--theme-icon-bg);
  font-size: .95rem;
  line-height: 1;
}

.session-chip {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 13px;
  border: 1px solid var(--button-border);
  border-radius: 999px;
  background: var(--button-soft);
  box-shadow: var(--button-shadow);
  color: var(--muted);
  font-size: .8rem;
  font-weight: 800;
}

.session-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #42c77a;
  box-shadow: 0 0 10px rgba(66,199,122,.45);
}

.game-layout {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr) 170px;
  gap: 22px;
  align-items: center;
}

.player-card {
  min-height: 330px;
  border: 1px solid var(--card-border);
  border-radius: 24px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: var(--card-bg);
  box-shadow: var(--card-shadow);
  opacity: .72;
  transform: translateY(0) scale(.98);
  transition: background .35s ease, border-color .2s ease, box-shadow .2s ease, opacity .2s ease, transform .2s ease;
}

.player-card.active {
  opacity: 1;
  transform: translateY(-4px) scale(1);
}

.player-red.active {
  border-color: rgba(255, 75, 92, .48);
  box-shadow: var(--card-shadow), 0 0 0 2px rgba(255, 75, 92, .07), 0 18px 42px rgba(217, 33, 55, .12);
}

.player-blue.active {
  border-color: rgba(63, 145, 255, .48);
  box-shadow: var(--card-shadow), 0 0 0 2px rgba(63, 145, 255, .07), 0 18px 42px rgba(42, 103, 213, .12);
}

.player-copy {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.portrait-frame {
  width: 104px;
  height: 104px;
  padding: 5px;
  border-radius: 31px;
  overflow: hidden;
  position: relative;
  background: var(--button-soft);
  border: 1px solid var(--button-border);
  box-shadow: inset 0 1px rgba(255,255,255,.12), 0 14px 28px rgba(0,0,0,.16);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

.player-portrait {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  border-radius: 26px;
}

.player-red.active .portrait-frame {
  transform: scale(1.045);
  border-color: rgba(255,75,92,.58);
  box-shadow: 0 0 0 3px rgba(255,75,92,.08), 0 16px 34px rgba(217,33,55,.22);
}

.player-blue.active .portrait-frame {
  transform: scale(1.045);
  border-color: rgba(63,145,255,.58);
  box-shadow: 0 0 0 3px rgba(63,145,255,.08), 0 16px 34px rgba(42,103,213,.22);
}

.player-label { font-weight: 950; letter-spacing: .08em; font-size: 1.08rem; }
.player-red .player-label { color: var(--red); }
.player-blue .player-label { color: var(--blue); }
.player-card small { color: var(--muted); }

.board-panel { min-width: 0; }
.board-row { display: flex; gap: 10px; align-items: stretch; }

.coordinates {
  color: var(--muted);
  font-weight: 800;
  font-size: .8rem;
  user-select: none;
}

.coordinates.columns {
  margin-left: 34px;
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  text-align: center;
  margin-bottom: 7px;
}

.coordinates.rows {
  width: 24px;
  display: grid;
  grid-template-rows: repeat(10, 1fr);
  align-items: center;
  text-align: right;
}

.board {
  width: 100%;
  aspect-ratio: 1;
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 4px;
  padding: 10px;
  border-radius: 22px;
  background: var(--board-frame);
  box-shadow: var(--board-shadow);
  transition: background .35s ease, box-shadow .35s ease;
}

.cell {
  appearance: none;
  border: 1px solid var(--cell-border);
  border-radius: 10px;
  background: var(--cell-bg);
  cursor: pointer;
  position: relative;
  padding: 0;
  overflow: hidden;
  transition: transform .12s ease, background .15s ease, border-color .15s ease, box-shadow .15s ease;
}

.cell:hover:not(.occupied) {
  transform: scale(1.025);
  border-color: var(--cell-hover);
  background: var(--cell-hover-bg);
  box-shadow: var(--cell-hover-shadow);
}

.cell:not(.occupied)::after {
  content: "";
  position: absolute;
  width: 58%;
  height: 58%;
  inset: 21%;
  border-radius: 50%;
  opacity: 0;
  transform: scale(.82);
  transition: opacity .14s ease, transform .14s ease;
  pointer-events: none;
}

.board.turn-red .cell:not(.occupied):hover::after {
  opacity: .34;
  transform: scale(1);
  background: radial-gradient(circle at 35% 28%, #ffc5c5 0, #ff4b58 38%, #bf1630 82%);
  box-shadow: 0 0 20px rgba(255,65,78,.28);
}

.board.turn-blue .cell:not(.occupied):hover::after {
  opacity: .34;
  transform: scale(1);
  background: radial-gradient(circle at 35% 28%, #c8e6ff 0, #3588ff 38%, #173eb2 82%);
  box-shadow: 0 0 20px rgba(49,127,255,.28);
}

.piece {
  width: 68%;
  height: 68%;
  position: absolute;
  inset: 16%;
  border-radius: 50%;
  box-shadow: inset 0 2px 5px rgba(255,255,255,.45), 0 8px 16px rgba(0,0,0,.24);
  animation: pieceDrop .32s cubic-bezier(.18,.9,.26,1.22);
}

.cell.just-placed::before {
  content: "";
  position: absolute;
  inset: 10%;
  border-radius: 14px;
  pointer-events: none;
  animation: placementFlash .34s ease-out;
}

.cell.invalid {
  animation: invalidCell .26s ease-in-out;
}

.piece.red { background: radial-gradient(circle at 35% 28%, #ffb0b0 0, #ff353f 33%, #b60e25 78%); }
.piece.blue { background: radial-gradient(circle at 35% 28%, #b5deff 0, #247dff 33%, #1537a8 78%); }

.cell.winning {
  z-index: 2;
  border-color: rgba(255, 224, 105, .9);
  animation: winningCell .7s ease-in-out infinite alternate;
}

.cell.winning .piece {
  animation: winningPiece .7s ease-in-out infinite alternate;
}

@keyframes pieceDrop {
  0% { transform: translateY(-9px) scale(.42); opacity: .1; filter: brightness(1.35); }
  62% { transform: translateY(1px) scale(1.14); opacity: 1; }
  82% { transform: translateY(0) scale(.96); }
  100% { transform: translateY(0) scale(1); filter: brightness(1); }
}

@keyframes placementFlash {
  0% { opacity: .75; box-shadow: inset 0 0 0 2px rgba(255,255,255,.42), 0 0 18px rgba(255,255,255,.18); }
  100% { opacity: 0; box-shadow: inset 0 0 0 1px rgba(255,255,255,0), 0 0 0 rgba(255,255,255,0); }
}

@keyframes invalidCell {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  50% { transform: translateX(4px); border-color: rgba(255,75,92,.82); }
  75% { transform: translateX(-2px); }
}

@keyframes winningCell {
  from { box-shadow: 0 0 0 1px rgba(255,224,105,.24), 0 0 10px rgba(255,212,66,.18); }
  to { box-shadow: 0 0 0 2px rgba(255,224,105,.72), 0 0 24px rgba(255,212,66,.52); }
}

@keyframes winningPiece {
  from { transform: scale(1); filter: brightness(1); }
  to { transform: scale(1.12); filter: brightness(1.28); }
}

.status-pill {
  width: fit-content;
  margin: 16px auto 0;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 17px;
  border: 1px solid var(--button-border);
  border-radius: 999px;
  background: var(--button-soft);
  box-shadow: var(--button-shadow);
}

.status-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  box-shadow: 0 2px 7px rgba(0,0,0,.25);
}
.status-dot.red { background: var(--red); }
.status-dot.blue { background: var(--blue); }

.actions {
  margin-top: 22px;
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

.primary-button,
.secondary-button {
  min-width: 180px;
  padding: 13px 22px;
  border-radius: 15px;
  font-weight: 950;
}

.primary-button {
  background: linear-gradient(135deg, #ff4f5b, #cc1931);
  color: #fff;
  box-shadow: 0 12px 28px rgba(212, 26, 48, .26);
}

.secondary-button {
  border: 1px solid var(--button-border);
  background: var(--button-soft);
  color: var(--text);
  box-shadow: var(--button-shadow);
}

.hint {
  margin-top: 14px;
  text-align: center;
  color: var(--muted);
  font-size: .78rem;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(0,0,0,.55);
  backdrop-filter: blur(9px);
  animation: modalFade .2s ease-out;
}

.modal-card {
  width: min(440px, 92vw);
  padding: 34px;
  text-align: center;
  border-radius: 26px;
  background: var(--shell-bg);
  border: 1px solid var(--shell-border);
  box-shadow: var(--shell-shadow);
  animation: modalPop .28s cubic-bezier(.2,.9,.25,1.1);
}

.winner-badge {
  width: fit-content;
  margin: 14px auto 0;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 12px;
  border-radius: 999px;
  border: 1px solid var(--button-border);
  background: var(--button-soft);
  color: var(--muted);
  font-size: .72rem;
  font-weight: 900;
  letter-spacing: .09em;
}

.modal-card h2 { margin: 12px 0 24px; font-size: 2.2rem; }

@keyframes modalFade {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes modalPop {
  from { opacity: 0; transform: translateY(14px) scale(.94); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

@media (max-width: 900px) {
  body { padding: 16px 0; }
  .app-shell { padding: 22px; }
  .game-layout { grid-template-columns: 1fr; }
  .player-card { min-height: auto; flex-direction: row; justify-content: flex-start; }
  .player-copy { align-items: flex-start; }
  .portrait-frame { width: 68px; height: 68px; border-radius: 20px; padding: 4px; }
  .player-portrait { border-radius: 16px; }
  .board-panel { order: -1; }
}

@media (max-width: 560px) {
  .app-shell { width: min(100% - 18px, 1180px); padding: 18px 12px; border-radius: 22px; }
  .topbar { align-items: flex-start; }
  .global-controls { top: 12px; right: 12px; gap: 7px; }
  .theme-button { min-width: 46px; width: 46px; padding: 0; }
  #themeToggleText, #soundToggleText { display: none; }
  .login-card { padding: 30px 22px; border-radius: 24px; }
  .board { gap: 3px; padding: 7px; border-radius: 16px; }
  .cell { border-radius: 7px; }
  .coordinates.columns { margin-left: 31px; font-size: .7rem; }
  .coordinates.rows { font-size: .7rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }

  .player-card,
  .portrait-frame,
  .theme-button,
  .primary-button,
  .secondary-button {
    transition-duration: .001ms !important;
  }
}