:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --primary: #0ea5e9;
    --primary-hover: #0284c7;
    --success: #10b981;
    --danger: #ef4444;
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; touch-action: manipulation; user-select: none; }

.new-game-wrapper {
    background-color: var(--bg-color); color: var(--text-main);
    display: flex; justify-content: center; align-items: center;
    min-height: 100vh; overflow: hidden;
}

#game-container {
    width: 100%; max-width: 500px; background-color: var(--card-bg);
    border-radius: 16px; padding: 16px; box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
    position: relative;
    min-height: 600px;
    display: flex; flex-direction: column;
}

.screen { display: none; flex-direction: column; align-items: center; text-align: center; animation: fadeIn 0.3s; flex: 1; justify-content: center; }
.screen.active { display: flex; }

@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.game-title { font-size: 2.2rem; font-weight: 800; margin-bottom: 16px; color: #7dd3fc; }
.instructions { color: var(--text-muted); margin-bottom: 32px; line-height: 1.6; padding: 0 20px; font-size: 1.1rem; }
.final-score { font-size: 1.5rem; font-weight: 700; color: #7dd3fc; margin-bottom: 24px; }

.btn {
    border: none; padding: 12px 24px; border-radius: 8px; font-size: 1.1rem; font-weight: 700;
    color: white; cursor: pointer; transition: all 0.2s; width: 100%; max-width: 250px;
}
.btn:active { transform: scale(0.95); }
.btn.primary { background-color: var(--primary); }
.btn.primary:hover { background-color: var(--primary-hover); }

.header { display: flex; justify-content: space-between; width: 100%; margin-bottom: 10px; padding-bottom: 12px; border-bottom: 1px solid #334155; font-weight: 700; font-size: 1.2rem; color: #7dd3fc; }

.actions-area { display: flex; justify-content: space-between; width: 100%; margin-bottom: 20px; }
.btn-sm {
    background: #334155; border: none; color: #fff; padding: 8px 16px; border-radius: 6px; cursor: pointer; font-weight: bold;
}
.btn-sm:active { background: #475569; }
.btn-sm.danger { background: rgba(239, 68, 68, 0.2); color: #fca5a5; }
.btn-sm.danger:active { background: rgba(239, 68, 68, 0.4); }
.btn-sm:disabled { opacity: 0.5; pointer-events: none; }

.game-area { width: 100%; flex: 1; display: flex; justify-content: center; align-items: center; }

#tubes-container {
    display: flex; flex-wrap: wrap; justify-content: center; gap: 15px; width: 100%;
}

.tube {
    width: 46px; height: 180px;
    border: 3px solid rgba(255,255,255,0.4); border-top: none;
    border-radius: 0 0 23px 23px;
    background: rgba(255,255,255,0.1);
    display: flex; flex-direction: column-reverse;
    justify-content: flex-start;
    padding: 2px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
    position: relative;
    overflow: hidden;
}

/* Give the tube an opening lip */
.tube::before {
    content: ''; position: absolute;
    top: -5px; left: -3px; right: -3px; height: 10px;
    border: 3px solid rgba(255,255,255,0.4);
    border-radius: 50%;
    z-index: 10;
}

.tube.selected {
    transform: translateY(-20px);
    box-shadow: 0 15px 20px -5px rgba(0,0,0,0.5);
    border-color: #38bdf8;
}

.water-layer {
    width: 100%; height: 25%;
    transition: all 0.3s ease-in-out;
}

/* Colors for water */
.color-1 { background-color: #ef4444; } /* Red */
.color-2 { background-color: #3b82f6; } /* Blue */
.color-3 { background-color: #10b981; } /* Green */
.color-4 { background-color: #eab308; } /* Yellow */
.color-5 { background-color: #8b5cf6; } /* Purple */
.color-6 { background-color: #06b6d4; } /* Cyan */
.color-7 { background-color: #f97316; } /* Orange */

.msg-overlay {
    position: absolute; top: 40%; left: 0; width: 100%; text-align: center;
    font-size: 2.5rem; font-weight: 900; color: #38bdf8; text-shadow: 0 0 15px #000;
    z-index: 50; animation: popIn 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.msg-overlay.hidden { display: none; }
@keyframes popIn { 0% { transform: scale(0); } 100% { transform: scale(1); } }