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

body {
    background-color: #1a1a1a;
    color: #f0f0f0;
    font-family: 'Inter', 'Segoe UI', 'Helvetica Neue', system-ui, sans-serif;
    line-height: 1.5;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 1.5rem;
    min-height: 100vh;
}

.container {
    max-width: 900px;
    width: 100%;
}

/* 头部 */
.brand-header {
    margin-bottom: 2.5rem;
    border-bottom: 2px solid #333;
    padding-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
}

.brand-header h1 {
    font-weight: 500;
    font-size: 1.8rem;
    letter-spacing: 0.02em;
    color: #ffffff;
}

.brand-header .badge {
    background: #2a2a2a;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    color: #aaa;
    border: 1px solid #3c3c3c;
}

/* 卡片列表 */
.mapping-list {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    margin-top: 1rem;
}

/* 黑块单元：始终3列，宽度比30:40:30，内部留间隙 */
.mapping-card {
    background-color: #0d0d0d;
    border-radius: 20px;
    border: 1px solid #2c2c2c;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.6);
    display: grid;
    grid-template-columns: 30% 40% 30%;  /* 固定比例，永不改变 */
    gap: 4px;                             /* 小间隙，让4个方块之间有黑色分隔感 */
    padding: 6px;                         /* 外围留一点黑底，凸显圆角 */
    overflow: hidden;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    min-height: 96px;
}

.mapping-card:hover {
    border-color: #4a4a4a;
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.8);
}

/* 所有内部小方块统一圆角，形成“黑块里嵌4个小方块”的效果 */
.cell-a,
.cell-f,
.cell-g,
.cell-b {
    border-radius: 14px;          /* 小方块自身圆角 */
    display: flex;
    align-items: center;
    word-break: break-word;
    font-size: 1.05rem;
    letter-spacing: 0.02em;
}

/* 左侧 a —— 深蓝色底白字 */
.cell-a {
    background-color: #1e4b8a;
    color: #ffffff;
    font-weight: 500;
    padding: 1.2rem 1.2rem;
    justify-content: flex-start;
}

/* 中间列：上下两个小方块 */
.cell-middle {
    display: flex;
    flex-direction: column;
    gap: 4px;                     /* 上下小方块间隙 */
    min-width: 0;
}

/* 中间上：f 深红色底白字 */
.cell-f {
    background-color: #a83f3f;
    color: #ffffff;
    font-weight: 500;
    padding: 0.6rem 1.2rem;
    flex: 1;
    display: flex;
    align-items: center;
}

/* 中间下：g 深粉色底白字 */
.cell-g {
    background-color: #c95f8c;
    color: #ffffff;
    font-weight: 400;
    padding: 0.6rem 1.2rem;
    flex: 1;
    display: flex;
    align-items: center;
}

/* 右侧 b —— 深宝蓝色底白字 */
.cell-b {
    background-color: #0f2f5c;
    color: #ffffff;
    font-weight: 500;
    padding: 1.2rem 1.2rem;
    justify-content: flex-start;
}

/* 空值占位符 */
.empty-token {
    opacity: 0.6;
    font-style: italic;
    font-weight: 300;
    color: #ccc;
}



/*
 * 关键：不再针对竖屏/横屏切换布局！
 * 任何方向都保持30:40:30三列。
 * 仅在小屏幕上缩小内边距与字体，但列比例不变。
 */
@media (max-width: 500px) {
    .mapping-card {
        min-height: 80px;
        padding: 4px;
        gap: 3px;
    }

    .cell-a, .cell-b {
        padding: 0.8rem 0.8rem;
        font-size: 0.9rem;
    }

    .cell-f, .cell-g {
        padding: 0.4rem 0.8rem;
        font-size: 0.9rem;
    }

    .cell-middle {
        gap: 3px;
    }
}
a {
    color: inherit;
    text-decoration: none;
}