#menuBtn {

    position: fixed;

    top: 20px;
    left: 20px;

    z-index: 20;

    width: auto;
    padding: 12px 18px;

    border: none;
    border-radius: 14px;

    background: rgba(20, 40, 80, 0.85);

    color: #d8ecff;

    font-size: 15px;

    cursor: pointer;

    backdrop-filter: blur(10px);

    border: 1px solid rgba(120, 180, 255, 0.25);

    box-shadow:
        0 0 18px rgba(0, 140, 255, 0.25);

    transition: 0.25s;
}

#menuBtn:hover {

    transform: translateY(-2px);

    background: rgba(40, 80, 140, 0.95);

    box-shadow:
        0 0 24px rgba(80, 180, 255, 0.45);
}


:root {
    --primary: #00d4ff;
    --success: #00e676;
    --dark: #e8f1ff;
    --bg: #0b1020;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg);
    color: var(--dark);
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

h1 {
    margin-bottom: 10px;
    font-size: 24px;
    color: #ffffff;
}

.instruction {
    color: #7f8c8d;
    margin-bottom: 20px;
    text-align: center;
    font-size: 14px;
}

/* 预设按钮区域 */
.presets {
    margin-top: 20px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
}

button {
    background-color: #16233d;
    ;
    border: 2px solid var(--primary);
    color: var(--primary);
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.2s;
}

button:hover {
    background-color: var(--primary);
    color: #081018;
}

button.action-btn {
    background-color: var(--primary);
    border-color: var(--success);
    color: #081018;
}

button.action-btn:hover {
    background-color: #00c853;
}

button.clear-btn {
    background-color: #ff5252;
    border-color: #ff5252;
    color: white;
}

button.clear-btn:hover {
    background-color: #ff1744;
    box-shadow: 0 0 12px rgba(255, 82, 82, 0.45);
}

/* 画布区域 */
.canvas-container {
    display: flex;
    gap: 30px;
    margin-bottom: 25px;
    flex-wrap: wrap;
    justify-content: center;
}

.canvas-box {
    text-align: center;
    background: #141d33;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid rgba(0, 212, 255, 0.15);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.45);
    position: relative;
}

.canvas-box h3 {
    margin-top: 0;
    margin-bottom: 10px;
    color: #eaf6ff;
}

canvas {
    border: 1px solid #2d4268;
    background-color: #0f172a;
    cursor: crosshair;
}

.canvas-hint {
    font-size: 12px;
    color: #7f98bc;
    margin-top: 5px;
}

/* 动画模拟区域 */
.simulation-container {
    width: 860px;
    max-width: 95%;
    background: #141d33;
    padding: 20px;
    border-radius: 8px;
    border: 1px solid rgba(0, 212, 255, 0.15);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.45);
    text-align: center;
}

#simCanvas {
    background-color: #0f172a;
    border: 1px solid #00d4ff;
    display: block;
    margin: 0 auto;
}

.controls {
    margin-top: 15px;
    display: flex;
    justify-content: center;
    gap: 15px;
}