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

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f5f5f5;
    --text-primary: #333333;
    --text-secondary: #666666;
    --border-color: #dddddd;
    --accent-color: #007bff;
    --accent-hover: #0056b3;
    --disabled-color: #cccccc;
    --card-bg: #ffffff;
    --card-border: #eeeeee;
    --input-bg: #ffffff;
    --input-border: #dddddd;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #333333;
    --text-primary: #e0e0e0;
    --text-secondary: #b0b0b0;
    --border-color: #404040;
    --accent-color: #3b82f6;
    --accent-hover: #60a5fa;
    --disabled-color: #666666;
    --card-bg: #2d2d2d;
    --card-border: #404040;
    --input-bg: #333333;
    --input-border: #404040;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
    max-height: 100vh;
    display: flex;
    flex-direction: column;
    min-height: 100vh; /* 追加: フッターを画面下部に固定 */
}

.main-content {
    display: flex;
    gap: 20px;
    flex: 1;
    margin: 20px 0;
}

/* テーマ切り替えボタンのスタイル */
.theme-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: background-color 0.3s;
}

.theme-toggle:hover {
    background-color: var(--hover-color);
}

.app-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--background-color);
    padding: 1rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}