body {
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f0f0f0;
    color: #333;
    transition: background-color 0.3s, color 0.3s;
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    background-color: #0078d7;
    color: white;
}

header h1 {
    margin: 0;
    font-size: 1.2rem;
}

.main-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem;
}

.board-container {
    position: relative;
}

.board {
    position: relative;
    width: 300px;     /* 6:3比例 */
    height: 600px;
    background: linear-gradient(to bottom, #444, #222);
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.5);
}

/* 引脚样式 */
.pin {
    width: 35px;
    height: 20px;
    background-color: #ddd;
    color: #000;
    position: absolute;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 10px;
    border-radius: 3px;
    cursor: pointer;
    transition: transform 0.2s, background-color 0.2s;
}

.pin:hover {
    transform: scale(1.2);
    background-color: #bbb;
}

/* 悬浮提示 */
.pin-hover {
    position: absolute;
    padding: 5px 10px;
    background: #0078d7;
    color: white;
    font-size: 12px;
    border-radius: 4px;
    pointer-events: none;
    display: none;
}

/* 点击显示信息 */
.pin-detail {
    margin-top: 20px;
    padding: 1rem;
    min-height: 40px;
    font-size: 14px;
    background-color: #eee;
    border-radius: 8px;
    width: 300px;
    text-align: center;
    transition: background-color 0.3s, color 0.3s;
}

/* 暗黑模式 */
body.dark {
    background-color: #121212;
    color: #eee;
}

body.dark header {
    background-color: #222;
}

body.dark .board {
    background: linear-gradient(to bottom, #222, #111);
    box-shadow: 0 4px 12px rgba(0,0,0,0.7);
}

body.dark .pin {
    background-color: #333;
    color: #eee;
}

body.dark .pin:hover {
    background-color: #555;
}

body.dark .pin-detail {
    background-color: #222;
    color: #eee;
}

body.dark .pin-hover {
    background: #bb86fc;
}