:root {
    --primary-color: #2563eb;
    --background-color: #f4f6f9;
    --card-background: #ffffff;
    --text-color: #222222;
    --sub-text-color: #666666;
    --border-color: #dcdcdc;
    --radius-small: 6px;
    --radius-medium: 10px;
    --radius-large: 12px;
    --card-shadow: 0 10px 30px rgba(0,0,0,.12);
    --header-text: #ffffff;
    --table-header-bg: #f0f2f5;
    --table-hover-bg: #f8fafc;
    --table-clickable-hover: #eef4ff;
    --input-bg: #ffffff;
}

[data-theme="dark"] {
    --primary-color: #3b82f6;
    --background-color: #0f172a;
    --card-background: #1e293b;
    --text-color: #f1f5f9;
    --sub-text-color: #94a3b8;
    --border-color: #334155;
    --card-shadow: 0 10px 30px rgba(0,0,0,.4);
    --header-text: #f1f5f9;
    --table-header-bg: #334155;
    --table-hover-bg: #1e293b;
    --table-clickable-hover: #1e3a8a;
    --input-bg: #0f172a;
}

body {
    margin: 0;
    background: var(--background-color);
    color: var(--text-color);
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}