:root {
  --bg-top: #0d0d12;
  --bg-bottom: #1b1024;
  --panel: rgba(20, 18, 28, 0.84);
  --panel-border: rgba(212, 175, 55, 0.2);
  --text: #f5e7b2;
  --muted: #bda97a;
  --x-color: #ff5c8a;
  --o-color: #5de2c4;
  --accent: #d4af37;
  --accent-dark: #8f6a14;
  --winner: #382d10;
  --shadow: 0 28px 70px rgba(0, 0, 0, 0.45);
  --glow: rgba(212, 175, 55, 0.18);
  --soft-surface: rgba(255, 255, 255, 0.05);
  --soft-border: rgba(212, 175, 55, 0.1);
  --button-text: #1a1410;
  --card-radius: 30px;
  --ease-smooth: cubic-bezier(0.22, 1, 0.36, 1);
}

body[data-theme="light"] {
  --bg-top: #f6ead0;
  --bg-bottom: #f0c6d8;
  --panel: rgba(255, 250, 243, 0.82);
  --panel-border: rgba(132, 82, 24, 0.14);
  --text: #342218;
  --muted: #7f604d;
  --x-color: #d14a68;
  --o-color: #1c8d7b;
  --accent: #b47b1d;
  --accent-dark: #e6b54d;
  --winner: #ffefbf;
  --shadow: 0 28px 70px rgba(124, 76, 28, 0.18);
  --glow: rgba(180, 123, 29, 0.16);
  --soft-surface: rgba(255, 255, 255, 0.58);
  --soft-border: rgba(132, 82, 24, 0.08);
  --button-text: #20150e;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Manrope", "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(212, 175, 55, 0.2), transparent 30%),
    radial-gradient(circle at 85% 20%, rgba(255, 92, 138, 0.12), transparent 22%),
    radial-gradient(circle at bottom right, rgba(93, 226, 196, 0.14), transparent 24%),
    radial-gradient(circle at 50% 110%, rgba(133, 76, 198, 0.12), transparent 28%),
    linear-gradient(160deg, var(--bg-top), var(--bg-bottom));
  background-attachment: fixed;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  position: relative;
  overflow: hidden;
}

.app-shell::before,
.app-shell::after {
  content: "";
  position: fixed;
  inset: auto;
  width: 34vw;
  height: 34vw;
  min-width: 240px;
  min-height: 240px;
  border-radius: 50%;
  filter: blur(30px);
  opacity: 0.24;
  pointer-events: none;
  animation: ambientFloat 12s var(--ease-smooth) infinite alternate;
}

.app-shell::before {
  top: 6%;
  left: -10%;
  background: radial-gradient(circle, rgba(212, 175, 55, 0.22), transparent 62%);
}

.app-shell::after {
  right: -8%;
  bottom: 4%;
  background: radial-gradient(circle, rgba(93, 226, 196, 0.18), transparent 60%);
  animation-duration: 15s;
}

.card {
  width: min(100%, 480px);
  padding: 30px;
  border: 1px solid var(--panel-border);
  border-radius: var(--card-radius);
  background: var(--panel);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
  isolation: isolate;
  transform: translateY(0);
  animation: cardEnter 0.7s var(--ease-smooth);
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(140deg, rgba(255, 255, 255, 0.08), transparent 28%),
    linear-gradient(320deg, rgba(212, 175, 55, 0.08), transparent 32%);
}

.card::after {
  content: "";
  position: absolute;
  width: 220px;
  height: 220px;
  right: -70px;
  top: -80px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.12), transparent 65%);
  pointer-events: none;
}

.card > * {
  position: relative;
  z-index: 1;
}

.screen {
  position: relative;
  display: none;
}

.screen.active {
  display: block;
}

.header-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.eyebrow {
  margin: 0 0 6px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

h1 {
  margin: 0;
  font-family: "Unbounded", "Manrope", sans-serif;
  font-size: clamp(32px, 6vw, 42px);
  line-height: 1.02;
  letter-spacing: -0.04em;
  text-shadow: 0 0 22px rgba(212, 175, 55, 0.16);
}

.subtitle {
  margin: 12px 0 24px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.55;
  max-width: 36ch;
}

.hero-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 22px;
}

.hero-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 40px;
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--soft-surface);
  box-shadow: inset 0 0 0 1px var(--soft-border);
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  text-align: center;
  backdrop-filter: blur(8px);
  transition: transform 0.22s var(--ease-smooth), box-shadow 0.22s var(--ease-smooth), color 0.22s var(--ease-smooth);
}

.hero-chip:hover {
  transform: translateY(-1px);
  color: var(--text);
  box-shadow:
    inset 0 0 0 1px rgba(212, 175, 55, 0.18),
    0 12px 24px rgba(0, 0, 0, 0.18);
}

.difficulty-panel {
  margin-bottom: 22px;
  padding: 16px;
  border-radius: 20px;
  background: var(--soft-surface);
  box-shadow: inset 0 0 0 1px var(--soft-border);
}

.hidden {
  display: none !important;
}

.difficulty-title {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.difficulty-buttons {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.difficulty-btn {
  padding: 12px 10px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.02);
  color: var(--text);
  box-shadow: inset 0 0 0 1px var(--soft-border);
}

.difficulty-btn.active {
  color: var(--button-text);
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  box-shadow: 0 12px 22px rgba(212, 175, 55, 0.18);
}

.variant-picker {
  margin-top: 16px;
  padding: 18px;
  border-radius: 20px;
  background: var(--soft-surface);
  box-shadow: inset 0 0 0 1px var(--soft-border);
  text-align: center;
}

.variant-picker.hidden {
  display: none;
}

.panel-copy {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 14px;
  text-align: center;
  text-wrap: balance;
}

.variant-buttons {
  display: grid;
  gap: 12px;
  margin-bottom: 12px;
}

#pickerDifficultyPanel {
  margin-bottom: 12px;
}

#startAiVariantBtn {
  width: 100%;
  margin-bottom: 12px;
}

.ghost-btn {
  background: transparent;
  color: var(--muted);
  box-shadow: inset 0 0 0 1px var(--soft-border);
}

.join-room-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  margin-top: 12px;
  margin-bottom: 12px;
}

.code-input,
.share-input {
  width: 100%;
  min-width: 0;
  border: none;
  border-radius: 14px;
  padding: 14px 16px;
  background: rgba(8, 8, 12, 0.36);
  box-shadow: inset 0 0 0 1px var(--soft-border);
  color: var(--text);
  font-size: 15px;
  font-weight: 700;
}

.code-input::placeholder,
.share-input::placeholder {
  color: var(--muted);
}

.setup-hint,
.panel-message {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 14px;
}

.panel-message {
  color: var(--text);
}

.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.mode-label {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 14px;
  border-radius: 14px;
  background: var(--soft-surface);
  box-shadow: inset 0 0 0 1px var(--soft-border);
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
  text-align: center;
}

.online-room-panel {
  margin: 16px 0 18px;
  padding: 16px;
  border-radius: 20px;
  background: var(--soft-surface);
  box-shadow: inset 0 0 0 1px var(--soft-border);
  text-align: center;
  backdrop-filter: blur(10px);
}

.online-room-copy {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 12px;
}

.online-room-actions {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
}

.status {
  margin: 16px 0 18px;
  padding: 15px 18px;
  border-radius: 18px;
  background: var(--soft-surface);
  box-shadow:
    inset 0 0 0 1px rgba(212, 175, 55, 0.12),
    0 0 0 1px rgba(255, 255, 255, 0.02);
  font-size: 18px;
  font-weight: 700;
  text-align: center;
  line-height: 1.45;
}

.result-banner {
  margin: -4px 0 18px;
  padding: 12px 14px;
  border-radius: 16px;
  background: rgba(212, 175, 55, 0.12);
  box-shadow: inset 0 0 0 1px rgba(212, 175, 55, 0.14);
  color: var(--text);
  font-size: 15px;
  font-weight: 700;
  text-align: center;
  line-height: 1.5;
}

.result-banner.hidden {
  display: none;
}

.menu-buttons,
.action-buttons {
  display: grid;
  gap: 12px;
}

.scoreboard {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 22px;
}

.score-box {
  padding: 14px 10px;
  border-radius: 18px;
  text-align: center;
  background: var(--soft-surface);
  box-shadow: inset 0 0 0 1px var(--soft-border);
  transition: transform 0.22s var(--ease-smooth), box-shadow 0.22s var(--ease-smooth);
}

.score-box:hover {
  transform: translateY(-2px);
  box-shadow:
    inset 0 0 0 1px rgba(212, 175, 55, 0.14),
    0 16px 28px rgba(0, 0, 0, 0.16);
}

.score-box span {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  color: var(--muted);
}

.score-box strong {
  font-size: 28px;
  font-weight: 800;
}

.x-box strong {
  color: var(--x-color);
}

.o-box strong {
  color: var(--o-color);
}

.board {
  --board-size: 3;
  display: grid;
  grid-template-columns: repeat(var(--board-size), 1fr);
  gap: 12px;
  margin-bottom: 20px;
  perspective: 1000px;
}

.cell {
  aspect-ratio: 1 / 1;
  border: none;
  border-radius: 22px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03)),
    rgba(8, 8, 12, 0.82);
  box-shadow:
    inset 0 0 0 1px rgba(212, 175, 55, 0.12),
    0 16px 28px rgba(0, 0, 0, 0.22);
  color: var(--text);
  font-size: clamp(42px, 10vw, 58px);
  font-weight: 900;
  cursor: pointer;
  transition:
    transform 0.22s var(--ease-smooth),
    box-shadow 0.22s var(--ease-smooth),
    background 0.22s var(--ease-smooth),
    opacity 0.18s ease,
    filter 0.22s var(--ease-smooth);
  position: relative;
  overflow: hidden;
}

.cell:hover:not(:disabled) {
  transform: translateY(-3px) scale(1.01);
  box-shadow:
    inset 0 0 0 1px rgba(212, 175, 55, 0.18),
    0 20px 34px rgba(0, 0, 0, 0.28),
    0 0 18px var(--glow);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.04)),
    rgba(12, 12, 18, 0.95);
}

.cell::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.08), transparent 45%);
  pointer-events: none;
}

.cell:disabled {
  cursor: default;
  opacity: 0.94;
}

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

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

.cell.winner {
  background: var(--winner);
  box-shadow:
    inset 0 0 0 1px rgba(212, 175, 55, 0.24),
    0 0 24px rgba(212, 175, 55, 0.18);
}

.cell.blocked {
  visibility: hidden;
  pointer-events: none;
  background: transparent;
  box-shadow: none;
  opacity: 0;
}

.cell.pop {
  animation: popIn 0.18s ease;
}

.cell.removing {
  animation:
    flickerOut 0.32s ease,
    crumbleOut 0.65s ease forwards;
  pointer-events: none;
}

.cell.removing::before {
  content: "";
  position: absolute;
  inset: 14%;
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(255, 224, 138, 0.95) 0 18%, transparent 19% 100%),
    radial-gradient(circle at 30% 30%, rgba(212, 175, 55, 0.95) 0 14%, transparent 15% 100%),
    radial-gradient(circle at 70% 28%, rgba(255, 208, 92, 0.85) 0 12%, transparent 13% 100%),
    radial-gradient(circle at 32% 70%, rgba(255, 224, 138, 0.9) 0 10%, transparent 11% 100%),
    radial-gradient(circle at 72% 72%, rgba(197, 146, 36, 0.9) 0 11%, transparent 12% 100%);
  opacity: 0;
  transform: scale(0.7);
  animation: dustBurst 0.65s ease forwards;
  pointer-events: none;
}

.cell.removing > * {
  pointer-events: none;
}

button {
  border: none;
  border-radius: 16px;
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 800;
  font-family: "Manrope", sans-serif;
  cursor: pointer;
  color: var(--button-text);
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  box-shadow: 0 14px 26px rgba(212, 175, 55, 0.2);
  transition:
    transform 0.22s var(--ease-smooth),
    opacity 0.18s ease,
    box-shadow 0.22s var(--ease-smooth),
    filter 0.22s var(--ease-smooth);
  position: relative;
  overflow: hidden;
}

button:hover {
  transform: translateY(-1px);
  opacity: 0.96;
  box-shadow: 0 16px 30px rgba(212, 175, 55, 0.24);
}

button::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 24%, rgba(255, 255, 255, 0.12) 50%, transparent 76%);
  transform: translateX(-120%);
  transition: transform 1.15s var(--ease-smooth);
  pointer-events: none;
}

button:hover::after {
  transform: translateX(120%);
}

button:active {
  transform: translateY(1px) scale(0.99);
}

button:focus-visible,
.cell:focus-visible,
.code-input:focus-visible,
.share-input:focus-visible {
  outline: 2px solid rgba(212, 175, 55, 0.7);
  outline-offset: 2px;
}

.secondary-btn {
  color: var(--text);
  background: linear-gradient(135deg, #332b43, #1d1827);
  box-shadow: 0 14px 26px rgba(0, 0, 0, 0.24);
}

body[data-theme="light"] .secondary-btn {
  background: linear-gradient(135deg, #dcc9b0, #f3e0c6);
  color: var(--text);
  box-shadow: 0 14px 26px rgba(124, 76, 28, 0.12);
}

.icon-btn {
  padding: 10px 14px;
  border-radius: 14px;
  background: var(--soft-surface);
  color: var(--text);
  box-shadow: inset 0 0 0 1px var(--soft-border);
}

body[data-theme="light"] .icon-btn {
  background: rgba(255, 255, 255, 0.6);
}

.modal {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(7, 7, 10, 0.7);
  backdrop-filter: blur(10px);
}

.modal.hidden {
  display: none;
}

.modal-content {
  width: min(100%, 340px);
  padding: 24px;
  border-radius: 24px;
  border: 1px solid rgba(212, 175, 55, 0.16);
  background: rgba(20, 18, 28, 0.96);
  text-align: center;
  box-shadow: var(--shadow);
}

body[data-theme="light"] .modal-content {
  background: rgba(255, 250, 243, 0.96);
}

.modal-content h2 {
  margin: 0 0 10px;
  font-family: "Unbounded", "Manrope", sans-serif;
  font-size: 28px;
}

.modal-content p {
  margin: 0 0 18px;
  color: var(--muted);
}

@keyframes popIn {
  0% {
    transform: scale(0.86);
  }

  100% {
    transform: scale(1);
  }
}

@keyframes flickerOut {
  0% {
    opacity: 1;
    filter: brightness(1);
  }

  20% {
    opacity: 0.35;
    filter: brightness(1.8);
  }

  42% {
    opacity: 1;
    filter: brightness(1.2);
  }

  62% {
    opacity: 0.25;
    filter: brightness(2);
  }

  100% {
    opacity: 0.15;
    filter: brightness(2.2);
  }
}

@keyframes crumbleOut {
  0% {
    transform: scale(1);
    box-shadow:
      inset 0 0 0 1px rgba(212, 175, 55, 0.12),
      0 16px 28px rgba(0, 0, 0, 0.22);
  }

  100% {
    transform: scale(0.72) translateY(10px);
    opacity: 0;
    box-shadow: none;
  }
}

@keyframes dustBurst {
  0% {
    opacity: 0;
    transform: scale(0.5) translateY(0);
  }

  30% {
    opacity: 1;
    transform: scale(1) translateY(-2px);
  }

  100% {
    opacity: 0;
    transform: scale(1.45) translateY(12px);
  }
}

@keyframes ambientFloat {
  0% {
    transform: translate3d(0, 0, 0) scale(1);
  }

  100% {
    transform: translate3d(18px, -18px, 0) scale(1.06);
  }
}

@keyframes cardEnter {
  0% {
    opacity: 0;
    transform: translateY(18px) scale(0.985);
  }

  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.hero-panel .hero-chip:nth-child(1) {
  animation: fadeRise 0.45s var(--ease-smooth) both 0.05s;
}

.hero-panel .hero-chip:nth-child(2) {
  animation: fadeRise 0.45s var(--ease-smooth) both 0.12s;
}

.hero-panel .hero-chip:nth-child(3) {
  animation: fadeRise 0.45s var(--ease-smooth) both 0.19s;
}

.hero-panel .hero-chip:nth-child(4) {
  animation: fadeRise 0.45s var(--ease-smooth) both 0.26s;
}

.menu-buttons button,
.variant-buttons button,
.action-buttons button {
  animation: fadeRise 0.5s var(--ease-smooth) both;
}

.menu-buttons button:nth-child(1),
.variant-buttons button:nth-child(1),
.action-buttons button:nth-child(1) {
  animation-delay: 0.08s;
}

.menu-buttons button:nth-child(2),
.variant-buttons button:nth-child(2),
.action-buttons button:nth-child(2) {
  animation-delay: 0.16s;
}

.menu-buttons button:nth-child(3) {
  animation-delay: 0.24s;
}

@keyframes fadeRise {
  0% {
    opacity: 0;
    transform: translateY(10px);
  }

  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 520px) {
  .app-shell {
    padding: 14px;
  }

  .card {
    padding: 20px;
    border-radius: 24px;
  }

  h1 {
    font-size: clamp(28px, 10vw, 38px);
  }

  .subtitle {
    max-width: none;
  }

  .scoreboard {
    gap: 10px;
  }

  .hero-panel {
    grid-template-columns: 1fr;
  }

  .top-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .header-row {
    flex-direction: column;
  }

  .top-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .difficulty-buttons {
    grid-template-columns: 1fr;
  }

  .mode-label {
    text-align: center;
  }

  .join-room-row,
  .online-room-actions {
    grid-template-columns: 1fr;
  }
}