/* ═══════════════════════════════════════
   TICTACTOE — VOLCANIC GLASS DESIGN SYSTEM
   ═══════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800;900&display=swap');

/* ── CSS VARIABLES ── */
:root {
  --bg:        #0f0f0f;
  --bg-2:      #1a1a1a;
  --bg-3:      #242424;
  --border:    #2e2e2e;
  --border-2:  #3a3a3a;
  --text:      #f0ece6;
  --text-2:    #a09890;
  --text-3:    #6a6460;
  --accent:    #ff6b2b;
  --accent-2:  #ffb088;
  --accent-glow: rgba(255, 107, 43, 0.35);
  --x-color:   #ff6b2b;
  --x-glow:    rgba(255, 107, 43, 0.5);
  --o-color:   #7eb8ff;
  --o-glow:    rgba(126, 184, 255, 0.5);
  --win-color: #b8f369;
  --win-glow:  rgba(184, 243, 105, 0.4);
  --radius:    14px;
  --radius-lg: 22px;
  --font:      'Outfit', sans-serif;
  --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ── BACKGROUND GRID ── */
.bg-grid {
  position: fixed; inset: 0; z-index: 0;
  background-image:
    linear-gradient(rgba(255,107,43,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,107,43,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

/* ── AMBIENT ORBS ── */
.orb {
  position: fixed; border-radius: 50%;
  filter: blur(80px); pointer-events: none; z-index: 0;
  animation: orb-drift 12s ease-in-out infinite alternate;
}
.orb-1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(255,107,43,0.12), transparent 70%);
  top: -150px; right: -100px;
}
.orb-2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(126,184,255,0.08), transparent 70%);
  bottom: -100px; left: -80px;
  animation-delay: -6s;
}
@keyframes orb-drift {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(30px, 20px) scale(1.08); }
}

/* ── SCREENS ── */
.screen {
  position: fixed; inset: 0; z-index: 10;
  display: flex; flex-direction: column;
  opacity: 0; pointer-events: none;
  transform: translateY(18px);
  transition: opacity 0.38s ease, transform 0.38s ease;
}
.screen.active {
  opacity: 1; pointer-events: all;
  transform: translateY(0);
}

/* ══════════════════════════════
   AUTH SCREEN
══════════════════════════════ */
#screen-auth {
  align-items: center;
  justify-content: center;
  padding: 24px;
  overflow-y: auto;
}

.auth-container {
  width: 100%; max-width: 420px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  position: relative;
  z-index: 1;
  box-shadow: 0 0 60px rgba(0,0,0,0.6), 0 0 0 1px rgba(255,107,43,0.06);
  animation: card-in 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}
@keyframes card-in {
  from { opacity: 0; transform: scale(0.92) translateY(20px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

/* Logo */
.logo {
  display: flex; align-items: center; gap: 6px;
  margin-bottom: 6px;
}
.logo.small { gap: 4px; }
.logo-x {
  font-size: 2rem; font-weight: 900; line-height: 1;
  color: var(--x-color);
  text-shadow: 0 0 20px var(--x-glow);
  letter-spacing: -1px;
}
.logo-sep { font-size: 1.4rem; color: var(--text-3); font-weight: 300; }
.logo-o {
  font-size: 2rem; font-weight: 900; line-height: 1;
  color: var(--o-color);
  text-shadow: 0 0 20px var(--o-glow);
  letter-spacing: -1px;
}
.logo.small .logo-x, .logo.small .logo-o { font-size: 1.4rem; }
.logo.small .logo-sep { font-size: 1rem; }
.logo-title {
  font-size: 1.5rem; font-weight: 800;
  color: var(--text); letter-spacing: -0.5px;
  margin-left: 4px;
}
.logo-sub {
  color: var(--text-3); font-size: 0.875rem;
  margin-bottom: 28px; font-weight: 400;
}

/* Tabs */
.auth-tabs {
  display: flex; gap: 4px;
  background: var(--bg-3);
  border-radius: 10px; padding: 4px;
  margin-bottom: 28px;
}
.tab-btn {
  flex: 1; padding: 9px 0;
  background: transparent; border: none;
  border-radius: 8px; cursor: pointer;
  font-family: var(--font); font-size: 0.9rem; font-weight: 600;
  color: var(--text-3);
  transition: var(--transition);
}
.tab-btn.active {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 12px var(--accent-glow);
}
.tab-btn:hover:not(.active) { color: var(--text-2); }

/* Forms */
.auth-form { display: none; flex-direction: column; gap: 18px; }
.auth-form.active { display: flex; }

.field-group { display: flex; flex-direction: column; gap: 6px; }
.field-group label {
  font-size: 0.8rem; font-weight: 600;
  color: var(--text-2); text-transform: uppercase; letter-spacing: 0.06em;
}
.field-group input {
  width: 100%; padding: 12px 16px;
  background: var(--bg-3); border: 1px solid var(--border);
  border-radius: var(--radius); color: var(--text);
  font-family: var(--font); font-size: 0.95rem;
  transition: var(--transition); outline: none;
}
.field-group input::placeholder { color: var(--text-3); }
.field-group input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.field-group input.error { border-color: #ff4d4d; }

.password-wrap { position: relative; }
.password-wrap input { padding-right: 46px; }
.toggle-pw {
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
  background: none; border: none; cursor: pointer;
  color: var(--text-3); padding: 4px;
  transition: color var(--transition);
}
.toggle-pw:hover { color: var(--text-2); }
.toggle-pw svg { width: 18px; height: 18px; display: block; }

.field-error {
  font-size: 0.78rem; color: #ff6b6b; font-weight: 500;
  min-height: 16px; display: block;
}

.form-msg {
  font-size: 0.85rem; font-weight: 500; text-align: center;
  min-height: 20px; border-radius: 8px; padding: 0;
  transition: var(--transition);
}
.form-msg.success { color: var(--win-color); }
.form-msg.error   { color: #ff6b6b; }

/* Buttons */
.btn-primary {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  width: 100%; padding: 13px 24px;
  background: var(--accent); border: none; border-radius: var(--radius);
  color: #fff; font-family: var(--font); font-size: 1rem; font-weight: 700;
  cursor: pointer; letter-spacing: 0.01em;
  transition: var(--transition);
  box-shadow: 0 4px 20px var(--accent-glow);
  position: relative; overflow: hidden;
}
.btn-primary::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.12), transparent);
  pointer-events: none;
}
.btn-primary svg { width: 18px; height: 18px; transition: transform var(--transition); }
.btn-primary:hover { background: #ff7d42; transform: translateY(-1px); box-shadow: 0 6px 28px var(--accent-glow); }
.btn-primary:hover svg { transform: translateX(3px); }
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 24px;
  background: transparent; border: 1px solid var(--border-2);
  border-radius: var(--radius); color: var(--text-2);
  font-family: var(--font); font-size: 0.95rem; font-weight: 600;
  cursor: pointer; transition: var(--transition);
}
.btn-secondary:hover { border-color: var(--text-3); color: var(--text); }

/* ══════════════════════════════
   GAME HEADER
══════════════════════════════ */
.game-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 24px;
  background: rgba(15,15,15,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  position: relative; z-index: 2;
  flex-shrink: 0;
}

.user-info {
  display: flex; align-items: center; gap: 10px;
}
.user-avatar {
  width: 34px; height: 34px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #ff9a5c);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 0.85rem; color: #fff;
  box-shadow: 0 0 12px var(--accent-glow);
}
.user-name { font-weight: 600; font-size: 0.9rem; color: var(--text-2); }

.btn-logout {
  display: flex; align-items: center; gap: 6px;
  background: transparent; border: 1px solid var(--border);
  border-radius: 8px; padding: 7px 14px;
  color: var(--text-3); font-family: var(--font); font-size: 0.82rem; font-weight: 600;
  cursor: pointer; transition: var(--transition);
}
.btn-logout svg { width: 15px; height: 15px; }
.btn-logout:hover { border-color: #ff4d4d; color: #ff6b6b; }

.btn-back {
  display: flex; align-items: center; gap: 6px;
  background: transparent; border: 1px solid var(--border);
  border-radius: 8px; padding: 7px 14px;
  color: var(--text-3); font-family: var(--font); font-size: 0.82rem; font-weight: 600;
  cursor: pointer; transition: var(--transition);
}
.btn-back svg { width: 15px; height: 15px; }
.btn-back:hover { border-color: var(--border-2); color: var(--text); }

.game-mode-badge {
  font-size: 0.78rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.08em; padding: 5px 12px;
  background: rgba(255,107,43,0.12); border: 1px solid rgba(255,107,43,0.25);
  border-radius: 20px; color: var(--accent);
}

/* ══════════════════════════════
   LOBBY SCREEN
══════════════════════════════ */
#screen-lobby { overflow-y: auto; }

.lobby-main {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 40px 24px; gap: 32px;
  position: relative; z-index: 1;
}

.lobby-title {
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  font-weight: 900; letter-spacing: -1px;
  text-align: center;
  background: linear-gradient(135deg, var(--text) 40%, var(--accent-2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.lobby-sub { color: var(--text-3); font-size: 1rem; text-align: center; margin-top: -20px; }

.mode-cards {
  display: flex; gap: 16px; flex-wrap: wrap; justify-content: center;
  width: 100%; max-width: 560px;
}

.mode-card {
  flex: 1; min-width: 200px; max-width: 260px;
  background: var(--bg-2); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 28px 24px;
  cursor: pointer; text-align: center;
  transition: var(--transition);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  position: relative; overflow: hidden;
}
.mode-card::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(255,107,43,0.04), transparent);
  opacity: 0; transition: opacity var(--transition);
}
.mode-card:hover { border-color: var(--accent); transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.4), 0 0 0 1px rgba(255,107,43,0.15); }
.mode-card:hover::before { opacity: 1; }
.mode-card.featured { border-color: rgba(255,107,43,0.3); }

.mode-icon { font-size: 2.4rem; line-height: 1; margin-bottom: 4px; }
.mode-card h3 { font-size: 1.15rem; font-weight: 800; color: var(--text); }
.mode-card p  { font-size: 0.85rem; color: var(--text-3); font-weight: 400; }
.mode-badge {
  margin-top: 8px; font-size: 0.72rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.07em;
  padding: 4px 10px; border-radius: 20px;
  background: rgba(255,107,43,0.1); color: var(--accent);
  border: 1px solid rgba(255,107,43,0.2);
}

/* Stats bar */
.stats-bar {
  display: flex; align-items: center; gap: 0;
  background: var(--bg-2); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 20px 32px;
  width: 100%; max-width: 400px;
}
.stat { flex: 1; text-align: center; }
.stat-val { display: block; font-size: 2rem; font-weight: 900; color: var(--text); line-height: 1; }
.stat-label { font-size: 0.75rem; font-weight: 600; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.06em; margin-top: 4px; display: block; }
.stat-divider { width: 1px; height: 40px; background: var(--border); }

/* ══════════════════════════════
   GAME SCREEN
══════════════════════════════ */
#screen-game { overflow-y: auto; }

.game-main {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 24px; gap: 20px;
  position: relative; z-index: 1;
}

/* Scoreboard */
.scoreboard {
  display: flex; align-items: center; justify-content: space-between;
  width: 100%; max-width: 420px;
  background: var(--bg-2); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 16px 24px;
}
.score-player {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  flex: 1;
}
.score-mark {
  font-size: 1.4rem; font-weight: 900; line-height: 1;
}
.x-mark { color: var(--x-color); text-shadow: 0 0 12px var(--x-glow); }
.o-mark { color: var(--o-color); text-shadow: 0 0 12px var(--o-glow); }
.score-pname { font-size: 0.75rem; font-weight: 600; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.05em; }
.score-num { font-size: 1.6rem; font-weight: 900; color: var(--text); }
.score-center { display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 0 16px; }
.score-draws-label { font-size: 0.7rem; font-weight: 600; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.05em; }

/* Turn indicator */
.turn-indicator {
  display: flex; align-items: center; gap: 10px;
  font-size: 0.95rem; font-weight: 600; color: var(--text-2);
  background: var(--bg-2); border: 1px solid var(--border);
  border-radius: 30px; padding: 8px 20px;
  transition: var(--transition);
}
.turn-mark {
  font-size: 1.1rem; font-weight: 900;
  transition: var(--transition);
}
.turn-mark.x { color: var(--x-color); text-shadow: 0 0 10px var(--x-glow); }
.turn-mark.o { color: var(--o-color); text-shadow: 0 0 10px var(--o-glow); }

/* Board */
.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  width: min(360px, 90vw);
  height: min(360px, 90vw);
  position: relative;
}

.cell {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: clamp(2rem, 8vw, 3.2rem);
  font-weight: 900; line-height: 1;
  transition: var(--transition);
  position: relative; overflow: hidden;
  user-select: none;
}
.cell::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(circle at center, rgba(255,107,43,0.08), transparent 70%);
  opacity: 0; transition: opacity var(--transition);
}
.cell:hover:not(.taken) { border-color: var(--border-2); transform: scale(1.03); }
.cell:hover:not(.taken)::before { opacity: 1; }
.cell.taken { cursor: default; }

/* X mark */
.cell.x-cell {
  color: var(--x-color);
  text-shadow: 0 0 20px var(--x-glow), 0 0 40px rgba(255,107,43,0.3);
  border-color: rgba(255,107,43,0.2);
  background: rgba(255,107,43,0.04);
  animation: pop-in 0.25s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}
/* O mark */
.cell.o-cell {
  color: var(--o-color);
  text-shadow: 0 0 20px var(--o-glow), 0 0 40px rgba(126,184,255,0.3);
  border-color: rgba(126,184,255,0.2);
  background: rgba(126,184,255,0.04);
  animation: pop-in 0.25s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}
/* Winning cells */
.cell.win-cell {
  background: rgba(184,243,105,0.08) !important;
  border-color: rgba(184,243,105,0.4) !important;
  animation: win-pulse 0.6s ease both;
}
.cell.win-cell.x-cell { color: var(--win-color) !important; text-shadow: 0 0 24px var(--win-glow) !important; }
.cell.win-cell.o-cell { color: var(--win-color) !important; text-shadow: 0 0 24px var(--win-glow) !important; }

@keyframes pop-in {
  from { transform: scale(0.4) rotate(-10deg); opacity: 0; }
  to   { transform: scale(1) rotate(0deg); opacity: 1; }
}
@keyframes win-pulse {
  0%   { transform: scale(1); }
  40%  { transform: scale(1.12); }
  70%  { transform: scale(0.96); }
  100% { transform: scale(1); }
}

/* ── RESULT OVERLAY ── */
.result-overlay {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(10,10,10,0.75);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-lg);
  opacity: 0; pointer-events: none;
  transition: opacity 0.3s ease;
  z-index: 20;
}
.result-overlay.show { opacity: 1; pointer-events: all; }

.result-card {
  background: var(--bg-2); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 36px 32px;
  text-align: center; display: flex; flex-direction: column;
  align-items: center; gap: 12px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.6);
  animation: result-in 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) both;
  max-width: 300px; width: 90%;
}
@keyframes result-in {
  from { transform: scale(0.7) translateY(20px); opacity: 0; }
  to   { transform: scale(1) translateY(0); opacity: 1; }
}
.result-emoji { font-size: 3rem; line-height: 1; }
.result-title { font-size: 1.8rem; font-weight: 900; letter-spacing: -0.5px; }
.result-sub { font-size: 0.9rem; color: var(--text-3); }
.result-actions { display: flex; flex-direction: column; gap: 10px; width: 100%; margin-top: 8px; }

/* ── SCROLLBAR ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border-2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-3); }

/* ── RESPONSIVE ── */
@media (max-width: 480px) {
  .auth-container { padding: 28px 20px; }
  .lobby-main { padding: 24px 16px; gap: 24px; }
  .mode-cards { flex-direction: column; align-items: center; }
  .mode-card { max-width: 100%; width: 100%; }
  .stats-bar { padding: 16px 20px; }
  .game-main { padding: 16px; gap: 14px; }
  .scoreboard { padding: 12px 16px; }
  .result-card { padding: 28px 20px; }
}