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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    min-height: 100vh;
    color: #ff6b3d;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    color: #ff8f5a;
    font-size: 2.5rem;
    font-weight: 300;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.8);
}

.main-content {
    display: flex;
    gap: 30px;
    align-items: flex-start;
}

/* Controls Panel */
.controls-panel {
    background: white;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    min-width: 300px;
    flex-shrink: 0;
}

.controls-panel h2 {
    margin-bottom: 25px;
    color: #ff6b3d;
    font-weight: 500;
    text-align: center;
}

.parameter {
    margin-bottom: 25px;
}

.parameter label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #ff8f5a;
}

.parameter input[type="range"] {
    width: 100%;
    height: 8px;
    border-radius: 5px;
    background: #ddd;
    outline: none;
    -webkit-appearance: none;
    margin-bottom: 8px;
}

.parameter input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #ff6b3d;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.parameter input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #ff6b3d;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.parameter .value {
    display: inline-block;
    background: #3a3a3a;
    padding: 4px 12px;
    border-radius: 15px;
    font-weight: 500;
    color: #ff8f5a;
    min-width: 60px;
    text-align: center;
}

.start-btn, .reset-btn {
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 10px;
}

.start-btn {
    background: linear-gradient(45deg, #4CAF50, #45a049);
    color: white;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.start-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(76, 175, 80, 0.4);
}

.start-btn:active {
    transform: translateY(0);
}

.reset-btn {
    background: linear-gradient(45deg, #f44336, #da190b);
    color: white;
}

.reset-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(244, 67, 54, 0.4);
}

/* Simulation Container */
.simulation-container {
    display: flex;
    align-items: stretch;
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    overflow: hidden;
    flex-grow: 1;
    height: 70vh; /* keep the whole display within the viewport */
}

.height-scale {
    width: 60px;
    background: #2a2a2a;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    padding: 0;
    z-index: 10;
}

.height-tick {
    position: absolute;
    width: calc(100% - 20px);
    height: 1px;
    border-top: 1px solid #ccc;
    left: 50%;
    transform: translateX(-50%);
    box-sizing: border-box;
    z-index: 20;
}

.height-label {
    position: absolute;
    right: 15px;
    top: -8px;
    font-size: 12px;
    color: #ff8f5a;
    background: #2a2a2a;
    padding: 2px 4px;
}

.left-scale .height-label {
    right: auto;
    left: 15px;
}

.simulation-area {
    flex-grow: 1;
    position: relative;
    background: linear-gradient(to bottom, #87CEEB 0%, #E0F6FF 100%);
    display: flex;
    flex-direction: column;
}

#simulation-canvas {
    flex: 1 1 auto;
    display: block;
    background: transparent;
    max-height: calc(100% - 40px); /* Don't overlap the ground */
}

.ground {
    height: 40px;
    background: linear-gradient(to bottom, #8B4513, #654321);
    position: relative;
    flex-shrink: 0; /* ensure ground remains visible and not overlapped by canvas */
    z-index: 5;
}

.ground::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px; /* make the grass strip slightly thicker for clear alignment */
    background: #228B22;
}

/* Info Panel */
.info-panel {
    background: #2a2a2a;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.4);
    min-width: 250px;
    flex-shrink: 0;
    border: 1px solid #3a3a3a;
}

.info-panel h3 {
    margin-bottom: 20px;
    color: #ff8f5a;
    font-weight: 500;
    text-align: center;
}

.info-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
    padding: 8px 0;
    border-bottom: 1px solid #3a3a3a;
}

.info-item:last-child {
    border-bottom: none;
}

.info-item span:first-child {
    font-weight: 500;
    color: #ff8f5a;
}

.info-item span:last-child {
    font-weight: 600;
    color: #ff6b3d;
    background: #1a1a1a;
    padding: 2px 8px;
    border-radius: 8px;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .main-content {
        flex-direction: column;
        align-items: stretch;
    }
    
    .controls-panel, .info-panel {
        min-width: auto;
    }
    
    .simulation-container {
        height: 500px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .simulation-container {
        height: 400px;
    }
    
    .controls-panel, .info-panel {
        padding: 20px;
    }
}

/* Animation classes */
.ball {
    position: absolute;
    width: 20px;
    height: 20px;
    background: radial-gradient(circle at 30% 30%, #ff6b6b, #ee5a52);
    border-radius: 50%;
    box-shadow: 2px 2px 8px rgba(0,0,0,0.3);
    z-index: 10;
    transition: none;
}

.podium {
    position: absolute;
    background: linear-gradient(to bottom, #D3D3D3, #A9A9A9);
    border: 2px solid #888;
    border-radius: 5px 5px 0 0;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    z-index: 5;
}