style.css

/* ---------- Base ---------- */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; font-family: 'Segoe UI', system-ui, -apple-system, sans-serif; }
body {
  min-height: 100vh;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: #e2e8f0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ---------- Hero ---------- */
.hero {
  width: 100%;
  text-align: center;
  padding: 40px 20px 20px;
  background: radial-gradient(circle at 20% 20%, #6366f1 0%, transparent 50%),
              radial-gradient(circle at 80% 30%, #ec4899 0%, transparent 50%);
}
.hero h1 { font-size: 2.5rem; margin: 0 0 8px; letter-spacing: -0.5px; }
.hero p  { margin: 0 0 24px; opacity: 0.85; }

.tabs {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 8px;
  background: rgba(15, 23, 42, 0.5);
  padding: 6px;
  border-radius: 999px;
  backdrop-filter: blur(8px);
}
.tab {
  background: transparent;
  color: #e2e8f0;
  border: 0;
  padding: 8px 16px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.95rem;
  transition: background 0.2s, transform 0.1s;
}
.tab:hover  { background: rgba(255,255,255,0.08); }
.tab.active { background: #e2e8f0; color: #0f172a; font-weight: 600; }
.tab:active { transform: scale(0.96); }

/* ---------- Panels ---------- */
main {
  width: min(960px, 92%);
  margin: 20px auto 40px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 16px;
  padding: 24px;
  backdrop-filter: blur(8px);
}
.panel { display: none; animation: fade 0.3s ease; }
.panel.active { display: block; }
.panel h2 { margin-top: 0; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ---------- Buttons / Inputs ---------- */
button {
  background: #7c3aed;
  color: white;
  border: 0;
  padding: 8px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95rem;
  transition: background 0.2s, transform 0.1s;
}
button:hover  { background: #6d28d9; }
button:active { transform: scale(0.97); }
input[type=text], input[type=color] {
  background: rgba(255,255,255,0.08);
  color: #e2e8f0;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 0.95rem;
}
input[type=range] { accent-color: #7c3aed; }
label { display: inline-flex; align-items: center; gap: 8px; margin-right: 12px; }

/* ---------- Paint ---------- */
.toolbar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 12px; }
#canvas {
  width: 100%;
  height: auto;
  background: #f8fafc;
  border-radius: 12px;
  cursor: crosshair;
  display: block;
  touch-action: none;
}

/* ---------- Todo ---------- */
.todo-input { display: flex; gap: 8px; margin-bottom: 12px; }
.todo-input input { flex: 1; }
.todo-list { list-style: none; padding: 0; margin: 0; max-height: 300px; overflow-y: auto; }
.todo-list li {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 8px;
  margin-bottom: 6px;
}
.todo-list li.done span { text-decoration: line-through; opacity: 0.5; }
.todo-list li button {
  margin-left: auto;
  background: transparent;
  color: #fca5a5;
  padding: 4px 8px;
}
.todo-list li button:hover { background: rgba(252,165,165,0.1); }
.todo-stats { display: flex; justify-content: space-between; align-items: center; margin-top: 10px; font-size: 0.9rem; opacity: 0.8; }
.todo-stats button { background: #475569; }

/* ---------- Game ---------- */
.game-info { display: flex; gap: 18px; align-items: center; margin-bottom: 14px; }
.board {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  user-select: none;
}
.cell {
  aspect-ratio: 1;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 2rem;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}
.cell.up { background: #fde68a; transform: scale(1.04); }
.cell.up:hover { background: #fcd34d; }

/* ---------- Palette ---------- */
.palette { display: flex; gap: 24px; align-items: center; flex-wrap: wrap; }
.sliders { display: flex; flex-direction: column; gap: 8px; min-width: 260px; }
.swatch { width: 180px; height: 180px; border-radius: 16px; background: #7c3aed; box-shadow: 0 6px 30px rgba(0,0,0,0.4); }
.hex { font-family: 'Courier New', monospace; font-size: 1.1rem; letter-spacing: 1px; }

/* ---------- Quiz ---------- */
.quiz-box { background: rgba(255,255,255,0.05); border-radius: 12px; padding: 20px; }
.question { font-size: 1.1rem; margin: 0 0 14px; }
.answers { display: grid; gap: 8px; }
.answers button {
  background: rgba(255,255,255,0.08);
  text-align: left;
}
.answers button:hover { background: rgba(255,255,255,0.15); }
.answers button.correct { background: #16a34a !important; }
.answers button.wrong   { background: #dc2626 !important; }
.quiz-result { margin: 12px 0 0; font-weight: 600; }
.hidden { display: none; }

/* ---------- Footer ---------- */
footer { opacity: 0.6; font-size: 0.85rem; padding: 20px; text-align: center; }