:root {
  --bg: #07080f;
  --panel: rgba(16, 18, 32, 0.72);
  --stroke: rgba(255, 255, 255, 0.08);
  --text: #f4f6ff;
  --muted: #9aa3c7;
  --x: #6ee7ff;
  --o: #ff7ad9;
  --win: #c4ff6e;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
  --radius: 28px;
}

[data-theme="light"] {
  --bg: #eef1ff;
  --panel: rgba(255, 255, 255, 0.7);
  --stroke: rgba(20, 24, 50, 0.08);
  --text: #12152a;
  --muted: #5b6280;
  --shadow: 0 20px 50px rgba(40, 50, 120, 0.12);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: "Cairo", sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
}

.bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.55;
  animation: float 14s ease-in-out infinite;
}

.orb-a {
  width: 380px;
  height: 380px;
  background: #3b82f6;
  top: -80px;
  right: -40px;
}

.orb-b {
  width: 320px;
  height: 320px;
  background: #ec4899;
  bottom: -60px;
  left: -50px;
  animation-delay: -4s;
}

.orb-c {
  width: 220px;
  height: 220px;
  background: #22d3ee;
  top: 40%;
  left: 50%;
  animation-delay: -8s;
}

.grid-overlay {
  position: absolute;
  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(circle at 50% 40%, black, transparent 75%);
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, -20px) scale(1.08); }
}

.app {
  position: relative;
  z-index: 1;
  max-width: 520px;
  margin: 0 auto;
  padding: 28px 20px 48px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 22px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--x), var(--o));
  color: #081018;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  font-size: 20px;
  box-shadow: 0 10px 30px rgba(110, 231, 255, 0.25);
}

.brand h1 {
  font-size: 22px;
  line-height: 1.1;
}

.brand p {
  color: var(--muted);
  font-size: 13px;
}

.icon-btn {
  min-width: 52px;
  height: 44px;
  padding: 0 12px;
  border: 1px solid var(--stroke);
  background: var(--panel);
  color: var(--text);
  border-radius: 14px;
  cursor: pointer;
  backdrop-filter: blur(16px);
  font-size: 13px;
  font-weight: 700;
}

.modes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 18px;
}

.chip {
  border: 1px solid var(--stroke);
  background: var(--panel);
  color: var(--muted);
  padding: 12px;
  border-radius: 16px;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  backdrop-filter: blur(16px);
  transition: 0.2s ease;
}

.chip.active {
  color: var(--text);
  border-color: transparent;
  background: linear-gradient(135deg, rgba(110,231,255,0.18), rgba(255,122,217,0.18));
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.08);
}

.scoreboard {
  display: grid;
  grid-template-columns: 1fr 0.8fr 1fr;
  gap: 10px;
  margin-bottom: 16px;
}

.score-card {
  background: var(--panel);
  border: 1px solid var(--stroke);
  border-radius: 18px;
  padding: 12px 8px;
  text-align: center;
  backdrop-filter: blur(16px);
}

.score-card .mark {
  display: block;
  font-family: "Space Grotesk", sans-serif;
  font-size: 18px;
  font-weight: 700;
}

.score-card.x .mark { color: var(--x); }
.score-card.o .mark { color: var(--o); }
.score-card.draw .mark { color: var(--muted); }

.score-card .label {
  display: block;
  color: var(--muted);
  font-size: 12px;
  margin: 2px 0 4px;
}

.score-card strong {
  font-size: 22px;
}

.status {
  text-align: center;
  color: var(--muted);
  margin-bottom: 16px;
  min-height: 28px;
}

.status b {
  color: var(--text);
}

.board-wrap {
  perspective: 900px;
  margin-bottom: 20px;
}

.board-shell {
  position: relative;
  padding: 16px;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow);
  backdrop-filter: blur(22px);
  transform: rotateX(8deg);
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.cell {
  aspect-ratio: 1;
  border: 0;
  border-radius: 18px;
  background: rgba(255,255,255,0.04);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform 0.18s ease, background 0.18s ease;
}

.cell:hover:not(:disabled) {
  transform: translateY(-3px);
  background: rgba(255,255,255,0.08);
}

.cell:disabled {
  cursor: default;
}

.cell .sym {
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(36px, 9vw, 58px);
  font-weight: 700;
  line-height: 1;
  animation: pop 0.28s cubic-bezier(0.2, 1.4, 0.3, 1);
}

.cell.x .sym { color: var(--x); text-shadow: 0 0 22px rgba(110,231,255,0.55); }
.cell.o .sym { color: var(--o); text-shadow: 0 0 22px rgba(255,122,217,0.55); }
.cell.win { background: rgba(196,255,110,0.14); }

@keyframes pop {
  from { transform: scale(0.4); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.win-line {
  position: absolute;
  height: 8px;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--x), var(--win), var(--o));
  box-shadow: 0 0 24px rgba(196,255,110,0.6);
  pointer-events: none;
  z-index: 2;
}

@keyframes draw {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

.actions {
  display: grid;
  grid-template-columns: 1fr 1.3fr 1fr;
  gap: 10px;
}

.btn {
  border: 0;
  font: inherit;
  font-weight: 700;
  padding: 13px 10px;
  border-radius: 16px;
  cursor: pointer;
  transition: 0.18s ease;
}

.btn.primary {
  background: linear-gradient(135deg, #6ee7ff, #a78bfa, #ff7ad9);
  color: #0b1020;
}

.btn.ghost {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--stroke);
}

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

.modal {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: grid;
  place-items: center;
  background: rgba(4, 6, 14, 0.55);
  backdrop-filter: blur(10px);
}

.modal[hidden] { display: none; }

.modal-card {
  width: min(90vw, 360px);
  text-align: center;
  padding: 32px 24px;
  border-radius: 28px;
  background: var(--panel);
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.modal-card h2 {
  font-size: 32px;
  margin-bottom: 8px;
}

.modal-card p {
  color: var(--muted);
  margin-bottom: 20px;
}

.burst {
  position: absolute;
  inset: -40px;
  background: radial-gradient(circle at 50% 20%, rgba(110,231,255,0.25), transparent 45%);
  pointer-events: none;
}

@media (max-width: 480px) {
  .actions { grid-template-columns: 1fr; }
  .board-shell { transform: none; }
}

.icon-btn {
  font-size: 13px;
  font-weight: 700;
}