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

:root {
  /* Solarized Light */
  --bg:       #fdf6e3;
  --surface:  #eee8d5;
  --surface2: #e5dcc8;
  --border:   #cdc3a8;
  --text:     #657b83;
  --strong:   #586e75;
  --muted:    #93a1a1;
  --x:        #dc322f;
  --o:        #268bd2;
  --accent:   #2aa198;
  --accent-h: #218f87;
  --win:      #b58900;
  --r:        6px;
}

html, body { height: 100%; }

body {
  background-color: var(--bg);
  background-image: radial-gradient(circle, rgba(147,161,161,.22) 1px, transparent 1px);
  background-size: 24px 24px;
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  overflow-y: auto;
  font-family: 'IBM Plex Sans', system-ui, sans-serif;
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

#app {
  width: 100%;
  max-width: 400px;
  padding: 24px 20px 72px;
  margin: auto;
}

/* ── Screens ───────────────────────────────────────────── */
.screen { display: none; flex-direction: column; align-items: center; gap: 20px; }
.screen.active { display: flex; animation: fadein .2s ease; }

@keyframes fadein {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Typography ────────────────────────────────────────── */
h1 {
  font-family: 'IBM Plex Mono', monospace;
  font-size: clamp(4rem, 20vw, 5.5rem);
  font-weight: 700;
  letter-spacing: -1px;
  color: var(--accent);
  line-height: 1;
}

h2 {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--strong);
  letter-spacing: -.5px;
}

.tagline { color: var(--muted); font-size: .875rem; letter-spacing: .04em; }
.total-games-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: .72rem;
  color: var(--accent);
  letter-spacing: .05em;
}
.muted   { color: var(--muted); font-size: .875rem; text-align: center; }

/* ── Buttons ───────────────────────────────────────────── */
button {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: .9rem;
  font-weight: 600;
  border: none;
  border-radius: var(--r);
  padding: 13px 20px;
  cursor: pointer;
  transition: background .12s, transform .08s, box-shadow .12s;
  -webkit-tap-highlight-color: transparent;
}
button:active { transform: scale(.95); }

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 10px rgba(42,161,152,.28);
}
.btn-primary:hover { background: var(--accent-h); box-shadow: 0 2px 16px rgba(42,161,152,.4); }

.btn-secondary {
  background: var(--surface);
  color: var(--strong);
  border: 1.5px solid var(--border);
}
.btn-secondary:hover { background: var(--surface2); }

.btn-ghost {
  background: transparent;
  color: var(--muted);
  border: 1.5px solid var(--border);
}
.btn-ghost:hover { color: var(--strong); border-color: #aaa898; }

.btn-icon {
  background: var(--surface);
  color: var(--strong);
  border: 1.5px solid var(--border);
  padding: 10px 14px;
  white-space: nowrap;
  flex-shrink: 0;
}
.btn-icon:hover { background: var(--surface2); }

/* ── Menu ──────────────────────────────────────────────── */
.menu { display: flex; flex-direction: column; gap: 8px; width: 100%; }
.menu button { width: 100%; text-align: center; }

/* ── Spinner ───────────────────────────────────────────── */
.spinner {
  width: 40px; height: 40px;
  border: 2.5px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── URL box ───────────────────────────────────────────── */
.url-box { display: flex; gap: 8px; width: 100%; }
.url-box input {
  flex: 1;
  min-width: 0;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--r);
  color: var(--muted);
  padding: 11px 12px;
  font-size: .75rem;
  font-family: 'IBM Plex Mono', monospace;
}

/* ── Code input ────────────────────────────────────────── */
#join-code {
  width: 100%;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--r);
  color: var(--strong);
  padding: 16px;
  font-size: 1.9rem;
  font-family: 'IBM Plex Mono', monospace;
  font-weight: 700;
  text-align: center;
  letter-spacing: 8px;
  text-transform: uppercase;
  transition: border-color .15s;
}
#join-code:focus { outline: none; border-color: var(--accent); }
#join-code::placeholder { color: var(--muted); letter-spacing: 4px; }

/* ── Button row ────────────────────────────────────────── */
.btn-row { display: flex; gap: 10px; width: 100%; }
.btn-row button { flex: 1; }

/* ── Difficulty ────────────────────────────────────────── */
.difficulty-group { display: flex; gap: 12px; width: 100%; }
.diff-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  padding: 20px 14px;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--r);
  transition: border-color .12s, background .12s;
}
.diff-btn:hover { background: var(--surface2); border-color: var(--accent); }
.diff-icon { font-size: 2rem; }
.diff-name { font-size: .95rem; font-weight: 700; color: var(--strong); }
.diff-desc { font-size: .72rem; color: var(--muted); font-weight: 400; }

/* ── Scoreboard ────────────────────────────────────────── */
#scoreboard {
  display: flex;
  width: 100%;
  max-width: 340px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--r);
  padding: 14px;
}
.score-item { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 3px; }
.score-item.x-side { border-right: 1.5px solid var(--border); }
.score-item.o-side { border-left:  1.5px solid var(--border); }
.score-label {
  font-size: .62rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .09em;
  color: var(--muted);
  font-family: 'IBM Plex Mono', monospace;
}
.score-value {
  font-size: 1.9rem;
  font-weight: 700;
  font-family: 'IBM Plex Mono', monospace;
}
.score-item.x-side .score-value { color: var(--x); }
.score-item.o-side .score-value { color: var(--o); }

/* ── Status ────────────────────────────────────────────── */
#status { font-size: .95rem; font-weight: 600; min-height: 1.5em; text-align: center; color: var(--strong); }
.status-win  { color: var(--win)   !important; }
.status-loss { color: var(--x)     !important; }
.status-draw { color: var(--muted) !important; }

/* ── Board ─────────────────────────────────────────────── */
#board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  width: 100%;
  max-width: 340px;
}

.cell {
  aspect-ratio: 1;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--r);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.6rem;
  font-weight: 700;
  font-family: 'IBM Plex Mono', monospace;
  cursor: default;
  transition: background .12s, border-color .12s;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.cell.playable { cursor: pointer; }
.cell.playable:hover { background: var(--surface2); border-color: var(--accent); }
.cell.playable:active { transform: scale(.91); }

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

.cell.placed {
  animation: popin .2s cubic-bezier(.175,.885,.32,1.275) both;
}
@keyframes popin {
  from { transform: scale(.3); opacity: 0; }
  to   { transform: scale(1);  opacity: 1; }
}

.cell.winner {
  background: rgba(181,137,0,.1);
  border-color: rgba(181,137,0,.55);
  animation: pulse .45s ease .05s 2 alternate;
}
@keyframes pulse {
  to { background: rgba(181,137,0,.2); }
}

/* ── Mode info ─────────────────────────────────────────── */
#mode-info { font-size: .7rem; color: var(--muted); font-family: 'IBM Plex Mono', monospace; }

/* ── Game actions ──────────────────────────────────────── */
#game-actions { display: flex; gap: 10px; width: 100%; max-width: 340px; }
#game-actions button { flex: 1; }

/* ── Ad units ──────────────────────────────────────────── */
.ad-unit {
  width: 100%;
  max-width: 340px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.ad-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: .55rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--muted);
  opacity: .6;
}
.ad-unit ins {
  border-radius: var(--r);
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
  min-height: 100px;
}
.ad-unit-banner { align-items: center; }
.ad-unit-banner ins { min-height: unset; border: none; background: none; }

/* ── Footer ────────────────────────────────────────────── */
footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0 8px;
  padding: 10px 20px 13px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: .65rem;
  color: var(--muted);
  letter-spacing: .05em;
  background: linear-gradient(to top, var(--bg) 55%, transparent);
}
footer .sep { opacity: .4; }
footer .heart { color: #dc322f; font-size: .7rem; }

/* ── Utilities ─────────────────────────────────────────── */
.hidden { display: none !important; }