/* === The Neon Kinetic Design System === */

:root {
  --surface: #0a082f;
  --surface-container-low: #0f0d38;
  --surface-container: #151341;
  --surface-container-high: #1a194b;
  --surface-container-highest: #201e55;
  --surface-bright: #26245f;
  --surface-container-lowest: #000000;
  --primary: #97a9ff;
  --primary-dim: #3e65ff;
  --on-primary: #002283;
  --secondary: #cc7aff;
  --secondary-dim: #af25fe;
  --tertiary: #a1faff;
  --on-background: #e5e2ff;
  --on-surface-variant: #a8a7d5;
  --outline: #72719c;
  --outline-variant: #45446c;
  --error: #ff6e84;
}

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

body {
  background: var(--surface);
  color: var(--on-background);
  font-family: 'Plus Jakarta Sans', sans-serif;
  min-height: 100vh;
  overflow-x: hidden;
}

/* === Screens === */

.screen {
  display: none;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  padding: 2rem;
}

.screen.active {
  display: flex;
}

/* === Home Screen === */

.home-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  max-width: 420px;
  width: 100%;
  gap: 2rem;
}

.game-title {
  font-family: 'Spline Sans', sans-serif;
  font-size: 3.5rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-align: center;
}

.tagline {
  color: var(--on-surface-variant);
  text-align: center;
  font-size: 0.95rem;
  line-height: 1.6;
}

.identity-section {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--on-surface-variant);
  text-transform: uppercase;
}

.handle-input {
  width: 100%;
  padding: 1rem 1.25rem;
  background: var(--surface-container-low);
  color: var(--on-background);
  border: none;
  border-radius: 1rem;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 1rem;
  outline: none;
  transition: box-shadow 0.2s ease;
}

.handle-input:focus {
  box-shadow: 0 0 0 2px var(--primary);
}

.handle-input::placeholder {
  color: var(--outline);
}

.handle-error {
  color: var(--error);
  font-size: 0.8rem;
  min-height: 1.2em;
}

/* === Buttons === */

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  background: linear-gradient(135deg, var(--primary), var(--primary-dim));
  color: var(--on-primary);
  border: none;
  border-radius: 9999px;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s ease, transform 0.15s ease;
  width: 100%;
  max-width: 320px;
}

.btn-primary:hover {
  opacity: 0.9;
  transform: scale(1.02);
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: transparent;
  color: var(--primary);
  border: none;
  border-radius: 9999px;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease;
}

.btn-ghost:hover {
  background: var(--surface-container-high);
}

/* === Waiting === */

.waiting-message {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--on-surface-variant);
  font-size: 0.95rem;
}

.waiting-spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--outline-variant);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.hidden {
  display: none !important;
}

/* === Score Panel === */

.score-panel {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  width: 100%;
  max-width: 600px;
  padding: 1.5rem;
  background: var(--surface-container);
  border-radius: 3rem;
  margin-top: 1.5rem;
  box-shadow: 0 8px 32px rgba(227, 177, 255, 0.08);
}

.player-score {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  flex: 1;
}

.player-mark {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.75rem;
  font-size: 1.5rem;
}

.x-mark {
  color: var(--primary);
  background: rgba(151, 169, 255, 0.1);
}

.o-mark {
  color: var(--secondary);
  background: rgba(204, 122, 255, 0.1);
}

.player-info {
  text-align: center;
}

.player-handle {
  font-family: 'Spline Sans', sans-serif;
  font-size: 1rem;
  font-weight: 600;
}

.player-score-value {
  font-family: 'Spline Sans', sans-serif;
  font-size: 2rem;
  font-weight: 700;
}

.turn-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--on-surface-variant);
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
}

.turn-label.your-turn {
  color: var(--tertiary);
}

.active-badge {
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--on-primary);
  background: linear-gradient(135deg, var(--primary), var(--primary-dim));
  padding: 0.2rem 0.6rem;
  border-radius: 9999px;
}

.vs-divider {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  font-family: 'Spline Sans', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: var(--outline);
}

.match-over-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.trophy-icon {
  color: var(--tertiary);
  font-size: 1.5rem;
}

.win-text {
  font-family: 'Spline Sans', sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--tertiary);
}

.match-over-text {
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--on-surface-variant);
}

/* === Game Grid === */

.grid-pit {
  position: relative;
  background: var(--surface-container-lowest);
  border-radius: 2rem;
  padding: 1rem;
  margin-top: 2rem;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  width: 320px;
  height: 320px;
}

.cell {
  background: var(--surface-container-highest);
  border-radius: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.15s ease;
  font-size: 2.5rem;
  font-weight: 700;
  position: relative;
}

.cell:hover {
  background: var(--surface-bright);
}

.cell .token {
  display: flex;
  align-items: center;
  justify-content: center;
  animation: tokenSpring 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.cell .token.x-token {
  color: var(--primary);
  text-shadow: 0 0 20px rgba(151, 169, 255, 0.5);
}

.cell .token.o-token {
  color: var(--secondary);
  text-shadow: 0 0 20px rgba(204, 122, 255, 0.5);
}

@keyframes tokenSpring {
  0% {
    transform: scale(0);
    opacity: 0;
  }
  60% {
    transform: scale(1.2);
  }
  80% {
    transform: scale(0.95);
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

/* === Winning Line === */

.win-line-svg {
  position: absolute;
  top: 1rem;
  left: 1rem;
  width: 320px;
  height: 320px;
  pointer-events: none;
}

.win-line-svg line {
  stroke: var(--tertiary);
  stroke-width: 3;
  stroke-linecap: round;
  filter: drop-shadow(0 0 8px rgba(161, 250, 255, 0.6));
  stroke-dasharray: 150;
  stroke-dashoffset: 150;
}

.win-line-svg line.animate {
  animation: drawLine 0.6s ease forwards;
}

@keyframes drawLine {
  to {
    stroke-dashoffset: 0;
  }
}

/* === Game Actions === */

.game-actions {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
}

/* === Dialogs === */

.dialog-overlay {
  position: fixed;
  inset: 0;
  background: rgba(69, 68, 108, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.dialog {
  background: var(--surface-bright);
  border-radius: 3rem;
  padding: 3rem 2.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  max-width: 380px;
  width: 90%;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
}

.dialog-icon {
  font-size: 3rem;
  color: var(--tertiary);
}

.draw-icon {
  color: var(--on-surface-variant);
}

.defeat-icon {
  color: var(--error);
}

.dialog-heading {
  font-family: 'Spline Sans', sans-serif;
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.dialog-text {
  color: var(--on-surface-variant);
  text-align: center;
  font-size: 0.9rem;
  line-height: 1.5;
}

.dialog .btn-primary,
.dialog .btn-ghost {
  width: 100%;
}

/* === Notification === */

.notification {
  position: fixed;
  top: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface-bright);
  color: var(--on-background);
  padding: 1rem 2rem;
  border-radius: 1rem;
  font-size: 0.9rem;
  z-index: 200;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateX(-50%) translateY(-10px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* === Responsive === */

@media (max-width: 480px) {
  .game-title {
    font-size: 2.5rem;
  }

  .grid {
    width: 280px;
    height: 280px;
  }

  .win-line-svg {
    width: 280px;
    height: 280px;
  }

  .score-panel {
    gap: 1rem;
    padding: 1rem;
    border-radius: 2rem;
  }
}