/* リセットとベース設定 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #00bfa5;
    --secondary-color: #ff6b6b;
    --background-color: #f5f7fa;
    --card-background: #ffffff;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --border-color: #e0e6ed;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-color);
    min-height: 100vh;
}

/* ヘッダー */
header {
    background: linear-gradient(135deg, var(--primary-color), #00a693);
    color: white;
    padding: 2rem 0;
    text-align: center;
    box-shadow: var(--shadow);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* メインコンテンツ */
main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
    display: grid;
    gap: 2rem;
}

/* カード */
.card {
    background: var(--card-background);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
}

.card h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* フォーム */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 191, 165, 0.1);
}

.form-group small {
    display: block;
    margin-top: 0.25rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ボタン */
.btn-primary,
.btn-secondary {
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-block;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: #00a693;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 191, 165, 0.3);
}

.btn-secondary {
    background-color: #ecf0f1;
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: #d5dbdb;
}

/* 結果表示 */
.result-box {
    margin-top: 2rem;
    padding: 1.5rem;
    background-color: #f8f9fa;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.result-box h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.result-item:last-child {
    border-bottom: none;
}

.result-item.highlight {
    background-color: #fff3cd;
    margin: 0 -1.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
}

.result-item .label {
    color: var(--text-secondary);
}

.result-item .value {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* 車両リスト */
.vehicle-list {
    margin-top: 1rem;
    display: grid;
    gap: 1rem;
}

.vehicle-item {
    padding: 1rem;
    background-color: #f8f9fa;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.vehicle-info h4 {
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

.vehicle-info span {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.vehicle-actions button {
    padding: 0.5rem 1rem;
    margin-left: 0.5rem;
    border: none;
    border-radius: 6px;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
}

.edit-btn {
    background-color: #3498db;
    color: white;
}

.edit-btn:hover {
    background-color: #2980b9;
}

.delete-btn {
    background-color: #e74c3c;
    color: white;
}

.delete-btn:hover {
    background-color: #c0392b;
}

/* エコドライブのヒント */
.eco-tips {
    display: grid;
    gap: 1rem;
}

.tip {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem;
    background-color: #e8f5e9;
    border-radius: 8px;
    border-left: 4px solid var(--success-color);
}

.tip .icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.tip p {
    color: var(--text-primary);
    margin: 0;
}

/* チャート */
#fuelChart {
    max-width: 100%;
    height: auto;
}

.chart-controls {
    margin-top: 1rem;
    display: flex;
    gap: 1rem;
}

.chart-controls select {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: white;
}

/* モーダル */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background-color: white;
    margin: 10% auto;
    padding: 2rem;
    border-radius: 12px;
    max-width: 500px;
    width: 90%;
    position: relative;
    animation: slideIn 0.3s;
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.close {
    position: absolute;
    right: 1rem;
    top: 1rem;
    font-size: 2rem;
    font-weight: bold;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.close:hover {
    color: var(--text-primary);
}

/* フッター */
footer {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    padding: 2rem;
    margin-top: 4rem;
}

.language-switcher {
    margin-top: 1rem;
}

.language-switcher select {
    padding: 0.5rem 1rem;
    border: 1px solid #34495e;
    border-radius: 6px;
    background-color: #34495e;
    color: white;
    cursor: pointer;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .card {
        padding: 1.5rem;
    }
    
    .chart-controls {
        flex-direction: column;
    }
    
    .result-item.highlight {
        margin: 0 -1rem;
        padding: 0.75rem 1rem;
    }
}

/* ローディング */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* アクセシビリティ */
:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

/* プリント対応 */
@media print {
    body {
        background-color: white;
    }
    
    header,
    footer,
    .btn-primary,
    .btn-secondary,
    .language-switcher {
        display: none;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
        break-inside: avoid;
    }
}