:root {
    --primary: #0d6efd; --success: #198754; --danger: #dc3545; --warning: #ffc107;
    --bg: #f0f2f5; --card-bg: white;
}
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0; padding: 0; background: var(--bg); display: flex; flex-direction: column;
    height: 100vh; overflow: hidden;
}

/* Screens */
.screen { display: none; width: 100%; height: 100%; overflow-y: auto; padding: 20px; box-sizing: border-box; }
.screen.active { display: block; }

/* Setup Screen */
.setup-container { max-width: 600px; margin: 0 auto; background: white; padding: 20px; border-radius: 8px; box-shadow: 0 4px 10px rgba(0,0,0,0.1); }
.config-section { background: #f8f9fa; padding: 10px; margin-top: 20px; border-radius: 5px; border: 1px solid #ddd; }
.config-section summary { font-weight: bold; cursor: pointer; margin-bottom: 10px; }
.row { display: flex; gap: 10px; margin-bottom: 10px; }
.row > div { flex: 1; }
label { display: block; font-size: 12px; font-weight: bold; margin-bottom: 4px; color: #444; }
input[type="number"], input[type="text"], textarea { width: 100%; padding: 8px; box-sizing: border-box; border: 1px solid #ccc; border-radius: 4px; }
textarea { height: 60px; }
button { padding: 10px 15px; font-size: 16px; font-weight: bold; border-radius: 6px; cursor: pointer; border: none; color: white; transition: opacity 0.2s; }
button:hover { opacity: 0.9; }
button:focus-visible { outline: 3px solid white; outline-offset: -3px; box-shadow: 0 0 0 5px rgba(0,0,0,0.5); }
.btn-primary { background: var(--primary); width: 100%; margin-top: 15px; font-size: 18px; padding: 15px; }
.btn-success { background: var(--success); }
.btn-danger { background: var(--danger); }
.btn-warning { background: var(--warning); color: black; }

/* Game Board */
#top-bar { display: flex; justify-content: space-between; align-items: center; background: white; padding: 10px 20px; box-shadow: 0 2px 5px rgba(0,0,0,0.1); margin-bottom: 20px; border-radius: 8px; }
#turn-indicator { font-size: 24px; font-weight: bold; color: var(--primary); }

#players-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 15px; }
.player-card { background: white; border-radius: 8px; padding: 15px; box-shadow: 0 2px 5px rgba(0,0,0,0.1); border: 2px solid transparent; transition: 0.3s; }
.player-card.active-turn { border-color: var(--primary); box-shadow: 0 0 15px rgba(13,110,253,0.3); transform: scale(1.02); }
.player-card.frozen { opacity: 0.7; border-color: var(--warning); background: #fffdf5; }
.player-card.busted { opacity: 0.7; border-color: var(--danger); background: #fdf5f5; }

.p-name { font-size: 20px; font-weight: bold; border-bottom: 2px solid #eee; padding-bottom: 5px; margin-bottom: 10px; display: flex; justify-content: space-between; }
.p-stat { font-size: 14px; margin: 5px 0; }
.p-stat span { font-weight: bold; font-size: 16px; }
.p-cards-list { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 10px; min-height: 40px; background: #f8f9fa; padding: 5px; border-radius: 4px; }
.mini-card { padding: 4px 8px; border-radius: 4px; font-size: 12px; font-weight: bold; border: 1px solid black; background: white; }
.mini-card.number { border: 1px solid black; }
.mini-card.positive { border: 2px solid black; }
.mini-card.negative { border: 1px dashed black; }
.mini-card.special { border: 2px double black; background: #fff3cd; }

.actions { margin-top: 15px; display: flex; gap: 10px; }
.actions button { flex: 1; padding: 10px; display: none; }
.active-turn .actions button { display: block; }

/* Modals */
#modal-overlay { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.6); z-index: 1000; align-items: center; justify-content: center; }
.modal { background: white; padding: 25px; border-radius: 12px; max-width: 400px; width: 90%; text-align: center; box-shadow: 0 10px 25px rgba(0,0,0,0.2); }
.modal h2 { margin-top: 0; color: #333; }
.modal p { font-size: 18px; margin-bottom: 20px; }

.math-input-group { display: flex; flex-direction: column; gap: 10px; align-items: center; }
.math-input-group input { font-size: 24px; text-align: center; width: 150px; padding: 10px; }
.error-shake { animation: shake 0.4s; border-color: var(--danger) !important; background: #fdf5f5; }
@keyframes shake { 0% { transform: translateX(0); } 25% { transform: translateX(-5px); } 50% { transform: translateX(5px); } 75% { transform: translateX(-5px); } 100% { transform: translateX(0); } }

.choice-btn { width: 100%; margin-bottom: 10px; padding: 12px; font-size: 16px; background: var(--primary); color: white; border: none; border-radius: 6px; cursor: pointer; }
.choice-btn:hover { background: #0b5ed7; }