/* ============================================================
   Tic-Tac-Toe — Game Stylesheet
   ============================================================ */

/* ----------------------------------------------------------
   1. CSS Custom Properties
   ---------------------------------------------------------- */
:root {
  --t-bg:          #0f0f13;
  --t-surface:     #1a1a24;
  --t-surface-2:   #222236;
  --t-x:           #f43f5e;
  --t-x-bg:        rgba(244, 63, 94, 0.12);
  --t-o:           #3b82f6;
  --t-o-bg:        rgba(59, 130, 246, 0.12);
  --t-win:         #f59e0b;
  --t-win-bg:      rgba(245, 158, 11, 0.15);
  --t-text:        #f1f5f9;
  --t-text-muted:  #94a3b8;
  --t-border:      rgba(255, 255, 255, 0.08);

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;

  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-12: 3rem;

  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

/* ----------------------------------------------------------
   2. Reset & Base
   ---------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  background-color: var(--t-bg);
  color: var(--t-text);
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

ul { list-style: none; }
a  { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ----------------------------------------------------------
   3. Page Layout
   ---------------------------------------------------------- */
.ttt-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-bottom: var(--space-12);
}

.ttt-inner {
  width: 100%;
  max-width: 400px;
  padding: var(--space-8) var(--space-6) var(--space-8);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
}

/* ----------------------------------------------------------
   4. Header
   ---------------------------------------------------------- */
.ttt-header {
  text-align: center;
}

.ttt-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--t-x), var(--t-o));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ----------------------------------------------------------
   5. Scoreboard
   ---------------------------------------------------------- */
.ttt-score {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--space-4);
  width: 100%;
  background-color: var(--t-surface);
  border: 1px solid var(--t-border);
  border-radius: var(--radius-xl);
  padding: var(--space-4) var(--space-6);
}

.ttt-score__player {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
}

.ttt-score__player--x { color: var(--t-x); }
.ttt-score__player--o { color: var(--t-o); }

.ttt-score__label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  opacity: 0.8;
}

.ttt-score__value {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
}

.ttt-score__draws {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
}

.ttt-score__draws-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--t-text-muted);
}

.ttt-score__draws-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--t-text-muted);
}

/* ----------------------------------------------------------
   6. Turn Indicator
   ---------------------------------------------------------- */
.ttt-turn {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--t-text-muted);
  height: 1.5rem;
  transition: color var(--transition-base);
}

.ttt-turn--x { color: var(--t-x); }
.ttt-turn--o { color: var(--t-o); }

/* ----------------------------------------------------------
   7. Board
   ---------------------------------------------------------- */
.ttt-board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 10px;
  width: 100%;
  aspect-ratio: 1;
}

.ttt-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--t-surface);
  border: 2px solid var(--t-border);
  border-radius: var(--radius-lg);
  font-size: clamp(2rem, 10vw, 3.5rem);
  font-weight: 800;
  cursor: pointer;
  overflow: hidden;
  transition: background-color var(--transition-fast),
              border-color var(--transition-fast);
  user-select: none;
  line-height: 1;
}

.ttt-cell:hover:not(.ttt-cell--taken):not(.ttt-cell--disabled) {
  background-color: var(--t-surface-2);
  border-color: rgba(255, 255, 255, 0.15);
}

.ttt-cell:focus-visible {
  outline: 2px solid var(--t-win);
  outline-offset: 2px;
}

.ttt-cell--x {
  color: var(--t-x);
  background-color: var(--t-x-bg);
  border-color: rgba(244, 63, 94, 0.25);
}

.ttt-cell--o {
  color: var(--t-o);
  background-color: var(--t-o-bg);
  border-color: rgba(59, 130, 246, 0.25);
}

.ttt-cell--taken,
.ttt-cell--disabled {
  cursor: default;
  transform: none;
}

.ttt-cell--win {
  background-color: var(--t-win-bg);
  border-color: var(--t-win);
  animation: cell-win 400ms ease forwards;
}

@keyframes cell-win {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.08); }
  100% { transform: scale(1); }
}

/* ----------------------------------------------------------
   8. End Game Popup
   ---------------------------------------------------------- */
.ttt-popup-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.ttt-popup-backdrop.visible {
  opacity: 1;
  visibility: visible;
}

.ttt-popup {
  background-color: var(--t-surface);
  border: 1px solid var(--t-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8) var(--space-6);
  width: 100%;
  max-width: 320px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  text-align: center;
  transform: translateY(16px) scale(0.97);
  transition: transform var(--transition-base);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.5);
}

.ttt-popup-backdrop.visible .ttt-popup {
  transform: translateY(0) scale(1);
}

.ttt-popup__emoji {
  font-size: 3rem;
  line-height: 1;
}

.ttt-popup__title {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.ttt-popup__title--x { color: var(--t-x); }
.ttt-popup__title--o { color: var(--t-o); }

.ttt-popup__subtitle {
  font-size: 0.9375rem;
  color: var(--t-text-muted);
}

.ttt-popup__actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  width: 100%;
  margin-top: var(--space-2);
}

/* ----------------------------------------------------------
   9. Buttons
   ---------------------------------------------------------- */
.game-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding-block: var(--space-4);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  transition: background-color var(--transition-fast),
              transform var(--transition-fast),
              box-shadow var(--transition-fast);
  user-select: none;
}

.game-btn:focus-visible {
  outline: 2px solid var(--t-win);
  outline-offset: 2px;
}

.game-btn--primary {
  background-color: var(--t-x);
  color: #fff;
}

.game-btn--primary:hover {
  background-color: #e11d48;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(244, 63, 94, 0.35);
}

.game-btn--secondary {
  background-color: var(--t-surface-2);
  color: var(--t-text);
  border: 1px solid var(--t-border);
}

.game-btn--secondary:hover {
  background-color: var(--t-surface);
  border-color: rgba(255, 255, 255, 0.15);
}

/* ----------------------------------------------------------
   10. Back button (in-game top bar)
   ---------------------------------------------------------- */
.ttt-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.back-btn {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--t-text-muted);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.back-btn:hover {
  color: var(--t-text);
  background-color: var(--t-surface-2);
}

/* ----------------------------------------------------------
   11. Info Sections (How to Play + FAQ)
   ---------------------------------------------------------- */
.info-section {
  width: 100%;
  padding: var(--space-8) var(--space-6);
  border-top: 1px solid var(--t-border);
}

.info-section__inner {
  max-width: 400px;
  margin-inline: auto;
}

.info-section__title {
  font-size: 1.375rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
  text-align: center;
}

.htp-steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  list-style: none;
}

.htp-step {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
}

.htp-step__num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--t-x), var(--t-o));
  font-size: 0.875rem;
  font-weight: 800;
  color: #fff;
  flex-shrink: 0;
}

.htp-step__text {
  font-size: 0.9375rem;
  color: var(--t-text-muted);
  line-height: 1.6;
  padding-top: 5px;
}

.faq {
  display: flex;
  flex-direction: column;
}

.faq__item { border-bottom: 1px solid var(--t-border); }
.faq__item:first-child { border-top: 1px solid var(--t-border); }

.faq__details { width: 100%; }

.faq__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-4) 0;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--t-text);
  cursor: pointer;
  list-style: none;
  gap: var(--space-4);
  transition: color var(--transition-fast);
}

.faq__question::-webkit-details-marker { display: none; }

.faq__question::after {
  content: '';
  display: block;
  width: 16px;
  height: 16px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

.faq__details[open] .faq__question::after { transform: rotate(180deg); }
.faq__question:hover { color: var(--t-win); }

.faq__answer {
  padding-bottom: var(--space-4);
  font-size: 0.9375rem;
  color: var(--t-text-muted);
  line-height: 1.6;
}

/* ----------------------------------------------------------
   12. Footer
   ---------------------------------------------------------- */
.ttt-footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-6) var(--space-6) var(--space-8);
  border-top: 1px solid var(--t-border);
  width: 100%;
}

.ttt-footer__links {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
  justify-content: center;
}

.ttt-footer__link {
  font-size: 0.8125rem;
  color: var(--t-text-muted);
  transition: color var(--transition-fast);
}

.ttt-footer__link:hover { color: var(--t-text); }

.ttt-footer__sep {
  color: var(--t-border);
  font-size: 0.8125rem;
}

.ttt-footer__brand {
  font-size: 0.8125rem;
  color: var(--t-text-muted);
  transition: color var(--transition-fast);
}

.ttt-footer__brand:hover { color: var(--t-text); }

.ttt-footer__brand strong {
  background: linear-gradient(135deg, var(--t-x), var(--t-o));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
}

/* ----------------------------------------------------------
   13. Language pills (topbar)
   ---------------------------------------------------------- */
.pill--lang {
  font-size: 1.25rem;
  line-height: 1;
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  opacity: 0.4;
  transition: opacity var(--transition-fast);
}

.pill--lang:hover { opacity: 0.8; }
.pill--lang.pill--active { opacity: 1; }

/* ----------------------------------------------------------
   14. Responsive
   ---------------------------------------------------------- */
@media (max-width: 480px) {
  .ttt-inner { padding-inline: var(--space-4); }
  .ttt-title { font-size: 1.75rem; }
}