:root {
    --color-arrow-red: #FF0000;
    --color-arrow-blue: #0000FF;
    --color-support-line: #cbcbcb;  /* グリッド用 */
    --color-aux-line: #999999;      /* AB、AC線用 */
}

body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #ffffff;
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    text-align: center;
    padding: 10px;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.8);
}

h1 {
    margin: 0;
    font-size: 24px;
    font-family: Arial, sans-serif;
}

.info-icon {
    display: inline-block;
    width: 24px;
    height: 24px;
    line-height: 24px;
    text-align: center;
    border-radius: 50%;
    background-color: #f0f0f0;
    margin-left: 10px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.info-icon:hover {
    background-color: #e0e0e0;
}

.reset-button {
    display: inline-block;
    margin-left: 15px;
    padding: 4px 12px;
    font-size: 14px;
    border: 1px solid #ccc;
    border-radius: 4px;
    background-color: #f8f8f8;
    cursor: pointer;
    transition: background-color 0.3s;
}

.reset-button:hover {
    background-color: #e0e0e0;
}

.info-popup {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background-color: white;
    padding: 15px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    max-width: 300px;
    margin-top: 10px;
    text-align: left;
    font-size: 14px;
    z-index: 1001;
}

canvas {
    display: block;
    width: 100vw;
    height: 100vh;
}