/* ===== DESIGN TOKENS ===== */
:root {
  --clr-bg:       #07071a;
  --clr-surface:  rgba(255,255,255,0.05);
  --clr-border:   rgba(255,255,255,0.1);
  --clr-x:        #a78bfa;   /* violet */
  --clr-o:        #38bdf8;   /* sky blue */
  --clr-accent:   #f472b6;   /* pink */
  --clr-text:     #e2e8f0;
  --clr-muted:    #64748b;
  --clr-success:  #34d399;
  --clr-danger:   #fb7185;

  --radius-sm:  10px;
  --radius-md:  18px;
  --radius-lg:  28px;
  --radius-xl:  40px;

  --shadow-glow-x: 0 0 24px rgba(167,139,250,0.45);
  --shadow-glow-o: 0 0 24px rgba(56,189,248,0.45);
  --shadow-card:   0 8px 40px rgba(0,0,0,0.55), 0 1px 0 rgba(255,255,255,0.06) inset;

  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --font-main: 'Outfit', sans-serif;
  --font-alt:  'Space Grotesk', sans-serif;
}

/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font-main);
  background: var(--clr-bg);
  color: var(--clr-text);
  min-height: 100dvh;
  overflow-x: hidden;
  position: relative;
}

/* ===== ANIMATED BACKGROUND ===== */
.bg-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 60% at 20% 0%, rgba(167,139,250,0.18) 0%, transparent 70%),
    radial-gradient(ellipse 60% 50% at 80% 100%, rgba(56,189,248,0.15) 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 50% 50%, rgba(244,114,182,0.08) 0%, transparent 70%);
  animation: bgPulse 8s ease-in-out infinite alternate;
}
@keyframes bgPulse {
  from { opacity: 0.8; }
  to   { opacity: 1; }
}

/* Animated floating orbs */
.bg-canvas::before,
.bg-canvas::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  animation: floatOrb 12s ease-in-out infinite alternate;
}
.bg-canvas::before {
  width: 400px; height: 400px;
  background: rgba(167,139,250,0.12);
  top: -100px; left: -100px;
}
.bg-canvas::after {
  width: 350px; height: 350px;
  background: rgba(56,189,248,0.10);
  bottom: -80px; right: -80px;
  animation-delay: -6s;
}
@keyframes floatOrb {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(60px, 40px) scale(1.15); }
}

.noise-overlay {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 200px;
}

/* ===== APP WRAPPER ===== */
.app-wrapper {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100dvh;
  padding: 24px 16px 48px;
  gap: 28px;
}

/* ===== HEADER ===== */
.header {
  text-align: center;
  padding-top: 8px;
}
.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: var(--font-alt);
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1;
  margin-bottom: 6px;
}
.logo-x {
  color: var(--clr-x);
  text-shadow: var(--shadow-glow-x);
  animation: logoPop 3s ease-in-out infinite alternate;
}
.logo-o {
  color: var(--clr-o);
  text-shadow: var(--shadow-glow-o);
  animation: logoPop 3s ease-in-out infinite alternate-reverse;
}
.logo-sep {
  font-size: 1rem;
  color: var(--clr-muted);
  font-weight: 400;
  letter-spacing: 2px;
}
@keyframes logoPop {
  from { transform: translateY(0); }
  to   { transform: translateY(-4px); }
}
.site-title {
  font-size: 1.6rem;
  font-weight: 900;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #a78bfa, #f472b6, #38bdf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 2px;
}
.site-subtitle {
  font-size: 0.82rem;
  color: var(--clr-muted);
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

/* ===== SCREENS ===== */
.screen {
  display: none;
  width: 100%;
  max-width: 500px;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  animation: fadeSlideUp 0.4s ease both;
}
.screen.active { display: flex; }
@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ===== GLASSMORPHISM CARD ===== */
.card {
  background: var(--clr-surface);
  backdrop-filter: blur(20px) saturate(1.6);
  -webkit-backdrop-filter: blur(20px) saturate(1.6);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 32px 28px;
  width: 100%;
}
.card-title {
  font-size: 1.3rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 24px;
  color: var(--clr-text);
}

/* ===== MODE SELECTION ===== */
.mode-card { gap: 0; }
.mode-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 20px;
}
.mode-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 20px 12px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  color: var(--clr-text);
  font-family: var(--font-main);
}
.mode-btn:hover {
  background: rgba(255,255,255,0.09);
  border-color: rgba(167,139,250,0.5);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(167,139,250,0.2);
}
.mode-btn.selected {
  background: rgba(167,139,250,0.15);
  border-color: var(--clr-x);
  box-shadow: 0 0 0 2px rgba(167,139,250,0.35);
}
.mode-icon { font-size: 2rem; }
.mode-label { font-size: 1rem; font-weight: 700; }
.mode-desc { font-size: 0.75rem; color: var(--clr-muted); }

/* Difficulty */
.difficulty-row {
  margin-bottom: 20px;
  transition: var(--transition);
}
.difficulty-row.hidden { display: none; }
.diff-label {
  text-align: center;
  font-size: 0.8rem;
  color: var(--clr-muted);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.diff-buttons {
  display: flex;
  gap: 10px;
  justify-content: center;
}
.diff-btn {
  flex: 1;
  padding: 10px 0;
  border-radius: var(--radius-sm);
  border: 1px solid var(--clr-border);
  background: transparent;
  color: var(--clr-muted);
  font-family: var(--font-main);
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition);
  font-weight: 600;
}
.diff-btn:hover { color: var(--clr-text); border-color: rgba(255,255,255,0.25); }
.diff-btn.active {
  background: rgba(56,189,248,0.18);
  border-color: var(--clr-o);
  color: var(--clr-o);
  box-shadow: 0 0 12px rgba(56,189,248,0.25);
}

/* ===== BUTTONS ===== */
.primary-btn {
  width: 100%;
  padding: 15px;
  border-radius: var(--radius-md);
  border: none;
  background: linear-gradient(135deg, #a78bfa, #7c3aed);
  color: #fff;
  font-family: var(--font-main);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.5px;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(124,58,237,0.45);
  position: relative;
  overflow: hidden;
}
.primary-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15), transparent);
  opacity: 0;
  transition: var(--transition);
}
.primary-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(124,58,237,0.6); }
.primary-btn:hover::after { opacity: 1; }
.primary-btn:active { transform: translateY(0); }

.secondary-btn {
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--clr-border);
  background: rgba(255,255,255,0.05);
  color: var(--clr-text);
  font-family: var(--font-main);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.secondary-btn:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.25);
  transform: translateY(-2px);
}
.danger-btn { border-color: rgba(251,113,133,0.35); color: var(--clr-danger); }
.danger-btn:hover { background: rgba(251,113,133,0.12); border-color: var(--clr-danger); }

.icon-btn {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--clr-border);
  border-radius: 50%;
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--clr-muted);
  transition: var(--transition);
  margin-top: 6px;
}
.icon-btn:hover {
  background: rgba(255,255,255,0.12);
  color: var(--clr-text);
  transform: scale(1.1);
}

/* ===== SCOREBOARD ===== */
.scoreboard {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 420px;
  background: var(--clr-surface);
  backdrop-filter: blur(20px);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  box-shadow: var(--shadow-card);
}
.score-card {
  text-align: center;
  flex: 1;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.score-card.active-turn {
  background: rgba(255,255,255,0.06);
}
.score-symbol {
  font-size: 1.6rem;
  font-weight: 900;
  font-family: var(--font-alt);
  line-height: 1;
}
.score-name {
  font-size: 0.7rem;
  color: var(--clr-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin: 3px 0;
}
.score-value {
  font-size: 1.8rem;
  font-weight: 900;
  line-height: 1;
  font-family: var(--font-alt);
  transition: transform 0.25s cubic-bezier(0.34,1.56,0.64,1);
}
.score-value.bump { transform: scale(1.4); }
.x-color { color: var(--clr-x); text-shadow: var(--shadow-glow-x); }
.o-color { color: var(--clr-o); text-shadow: var(--shadow-glow-o); }

.score-middle {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 0 10px;
}
.draw-count {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--clr-muted);
  font-family: var(--font-alt);
  transition: transform 0.25s cubic-bezier(0.34,1.56,0.64,1);
}
.draw-count.bump { transform: scale(1.4); }
.draw-label {
  font-size: 0.62rem;
  color: var(--clr-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ===== STATUS BANNER ===== */
.status-banner {
  background: var(--clr-surface);
  backdrop-filter: blur(12px);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-xl);
  padding: 10px 28px;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.3px;
  color: var(--clr-text);
  text-align: center;
  max-width: 280px;
  transition: var(--transition);
}

/* ===== GAME BOARD ===== */
.board-wrapper {
  position: relative;
  width: min(360px, 90vw);
  height: min(360px, 90vw);
  flex-shrink: 0;
}
.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 10px;
  width: 100%;
  height: 100%;
}
.cell {
  background: var(--clr-surface);
  backdrop-filter: blur(12px);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 3rem;
  font-weight: 900;
  font-family: var(--font-alt);
  transition: background var(--transition), border-color var(--transition), transform 0.15s ease, box-shadow var(--transition);
  user-select: none;
  position: relative;
  overflow: hidden;
}
.cell::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(255,255,255,0.08) 0%, transparent 70%);
  opacity: 0;
  transition: opacity var(--transition);
}
.cell:hover:not(.taken) {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.2);
  transform: scale(1.04);
}
.cell:hover:not(.taken)::before { opacity: 1; }
.cell.taken { cursor: default; }
.cell.x {
  color: var(--clr-x);
  text-shadow: var(--shadow-glow-x);
  border-color: rgba(167,139,250,0.3);
  background: rgba(167,139,250,0.06);
}
.cell.o {
  color: var(--clr-o);
  text-shadow: var(--shadow-glow-o);
  border-color: rgba(56,189,248,0.3);
  background: rgba(56,189,248,0.06);
}
.cell.win-cell {
  animation: winPulse 0.7s ease forwards;
}
@keyframes winPulse {
  0%  { transform: scale(1); }
  40% { transform: scale(1.15); }
  70% { transform: scale(0.95); }
  100%{ transform: scale(1.05); }
}

/* Pop animation on placement */
.cell.pop {
  animation: cellPop 0.35s cubic-bezier(0.34,1.56,0.64,1) both;
}
@keyframes cellPop {
  from { transform: scale(0.5); opacity: 0; }
  to   { transform: scale(1);   opacity: 1; }
}

/* Hover preview */
.cell.preview-x { background: rgba(167,139,250,0.06); }
.cell.preview-o { background: rgba(56,189,248,0.06); }

/* Win line */
.win-line-svg {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  overflow: visible;
}
#winLine {
  stroke-dasharray: 10;
  stroke-dashoffset: 10;
  transition: stroke-dashoffset 0.5s ease;
}
#winLine.draw { stroke-dashoffset: 0; }

/* ===== ACTION ROW ===== */
.action-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== RESULT OVERLAY ===== */
.result-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(7, 7, 26, 0.75);
  backdrop-filter: blur(8px);
  animation: fadeIn 0.3s ease both;
}
.result-overlay.hidden { display: none; }
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
.result-card {
  background: rgba(15,15,40,0.92);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-xl);
  padding: 44px 40px;
  text-align: center;
  max-width: 380px;
  width: 100%;
  box-shadow: 0 20px 80px rgba(0,0,0,0.7), 0 1px 0 rgba(255,255,255,0.07) inset;
  animation: resultPop 0.5s cubic-bezier(0.34,1.56,0.64,1) both;
  position: relative;
  z-index: 2;
}
@keyframes resultPop {
  from { transform: scale(0.7) translateY(30px); opacity: 0; }
  to   { transform: scale(1) translateY(0);      opacity: 1; }
}
.result-emoji {
  font-size: 3.5rem;
  margin-bottom: 12px;
  animation: emojiSpin 0.6s ease both;
}
@keyframes emojiSpin {
  from { transform: rotate(-15deg) scale(0.5); opacity: 0; }
  to   { transform: rotate(0deg)  scale(1);   opacity: 1; }
}
.result-title {
  font-size: 1.8rem;
  font-weight: 900;
  margin-bottom: 8px;
  background: linear-gradient(135deg, #a78bfa, #f472b6, #38bdf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.result-sub {
  font-size: 0.9rem;
  color: var(--clr-muted);
  margin-bottom: 28px;
}
.result-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.confetti-canvas {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 1;
}

/* ===== THINKING INDICATOR ===== */
.thinking-dots {
  display: inline-flex;
  gap: 5px;
  align-items: center;
  margin-left: 4px;
}
.thinking-dots span {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--clr-o);
  animation: dotBounce 0.9s ease infinite;
}
.thinking-dots span:nth-child(2) { animation-delay: 0.15s; }
.thinking-dots span:nth-child(3) { animation-delay: 0.30s; }
@keyframes dotBounce {
  0%,80%,100% { transform: translateY(0);    opacity: 0.4; }
  40%          { transform: translateY(-6px); opacity: 1;   }
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 99px; }

/* ===== RESPONSIVE ===== */
@media (max-width: 420px) {
  .card { padding: 24px 18px; }
  .result-card { padding: 36px 22px; }
  .scoreboard { padding: 12px 10px; }
  .board-wrapper { width: min(310px, 92vw); height: min(310px, 92vw); }
  .cell { font-size: 2.4rem; }
  .logo { font-size: 1.8rem; }
  .site-title { font-size: 1.3rem; }
}