/* ====== Global cool look ====== */
:root {
  --bg1: #0f1021;
  --bg2: #1b1e38;
  --acc1: #7f5af0;
  --acc2: #2cb67d;
  --text: #e5e5e5;
  --muted: #a8a8a8;
  --card: rgba(255,255,255,0.06);
  --card-hover: rgba(255,255,255,0.12);
  --shadow: 0 10px 30px rgba(0,0,0,0.35);
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
}

body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 800px at 80% -10%, #2f2a55 0%, transparent 60%),
              radial-gradient(1200px 800px at -20% 110%, #153f3a 0%, transparent 60%),
              linear-gradient(135deg, var(--bg1), var(--bg2));
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header & Footer */
.site-header, .site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 22px;
  backdrop-filter: blur(8px);
  background: linear-gradient(90deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
  box-shadow: var(--shadow);
}

.brand { margin: 0; font-size: 22px; letter-spacing: .3px; }

.site-footer { justify-content: center; font-size: 13px; color: var(--muted); }

/* Buttons */
.primary-btn, .ghost-btn, .cell {
  cursor: pointer;
  transition: transform .15s ease, background .2s ease, box-shadow .2s ease;
}

.primary-btn {
  background: linear-gradient(135deg, var(--acc1), #5a8cff);
  color: white;
  border: 0;
  padding: 10px 16px;
  border-radius: 12px;
  box-shadow: 0 6px 16px rgba(127, 90, 240, .35);
}

.primary-btn:hover { transform: translateY(-2px); }

.ghost-btn {
  background: transparent;
  color: var(--text);
  border: 1px solid rgba(255,255,255,.2);
  padding: 8px 14px;
  border-radius: 12px;
}

.ghost-btn:hover {
  background: rgba(255,255,255,.06);
  transform: translateY(-1px);
}

/* Container & Cards */
.container {
  width: min(1100px, 92%);
  margin: 24px auto 40px;
  flex: 1;
}

.hero { text-align: center; margin: 36px 0 24px; }
.hero h2 { margin: 0 0 6px; font-size: 28px; }
.hero p { color: var(--muted); margin: 0; }

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  margin-top: 18px;
}

.card {
  background: var(--card);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 18px;
  padding: 18px;
  box-shadow: var(--shadow);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.card::after {
  content: "";
  position: absolute;
  inset: -50% -50%;
  background: radial-gradient(400px 300px at var(--x, 50%) var(--y, 50%), rgba(127,90,240,.20), transparent 60%);
  transition: opacity .2s ease, transform .2s ease;
  opacity: 0;
}

.card:hover::after { opacity: 1; transform: scale(1.06); }
.card:hover { transform: translateY(-4px); background: var(--card-hover); }

.card-icon { font-size: 40px; margin: 8px 0 4px; }
.card h3 { margin: 6px 0 6px; }
.card p { color: var(--muted); margin: 0 0 14px; }

/* Screens */
.screen { width: min(900px, 92%); margin: 22px auto 40px; }
.game-header { text-align: center; margin: 10px 0 18px; }
.game-header h2 { margin: 0 0 6px; }

/* Guessing Game */
.guess-panel {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

input[type="number"] {
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,.2);
  background: rgba(0,0,0,.25);
  color: var(--text);
  font-size: 16px;
  width: 260px;
  outline: none;
}

.status {
  text-align: center;
  margin-top: 8px;
}

.score-wrap {
  display: inline-grid;
  grid-template-columns: auto auto;
  gap: 8px 12px;
  margin-top: 6px;
  padding: 10px 14px;
  border-radius: 14px;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.08);
}

/* Tic Tac Toe */
.mode-panel {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin: 8px 0 14px;
}
.mode-group, .side-group { display: flex; align-items: center; gap: 12px; }
.side-group span { color: var(--muted); }

.ttt-board {
  width: min(420px, 92%);
  margin: 10px auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  background: linear-gradient(135deg, rgba(127,90,240,.15), rgba(44,182,125,.12));
  padding: 12px;
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.cell {
  aspect-ratio: 1 / 1;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,.18);
  background: rgba(0,0,0,.35);
  color: #fff;
  font-size: 42px;
  font-weight: 700;
  display: grid;
  place-items: center;
  box-shadow: inset 0 0 18px rgba(127,90,240,.25);
}

.cell:hover { background: rgba(255,255,255,.10); transform: translateY(-2px); }

.cell.win { box-shadow: 0 0 16px rgba(44,182,125,.65), inset 0 0 18px rgba(44,182,125,.25); }
.cell.draw { opacity: .85; }

/* Responsive */
@media (max-width: 500px) {
  .brand { font-size: 18px; }
  .hero h2 { font-size: 24px; }
  .cell { font-size: 36px; }
}