/* リセットと基本設定 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* カラーパレット - 柔らかく儚い印象 */
    --color-primary: #7c3aed;
    --color-primary-light: #a78bfa;
    --color-primary-dark: #5b21b6;
    --color-bg: #fafafa;
    --color-bg-card: #ffffff;
    --color-text-primary: #1f2937;
    --color-text-secondary: #6b7280;
    --color-border: #e5e7eb;
    --color-danger: #ef4444;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    
    /* シャドウ */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* スペーシング */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* ボーダーラジアス */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

body {
    font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: var(--spacing-lg);
    color: var(--color-text-primary);
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

/* ヘッダー */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    animation: fadeInDown 0.6s ease-out;
}

.logo {
    font-size: 2.5rem;
    font-weight: 600;
    color: white;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
}

.logo i {
    font-size: 2rem;
    animation: float 3s ease-in-out infinite;
}

.tagline {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.1rem;
    font-weight: 300;
}

/* インフォバナー */
.info-banner {
    background: rgba(255, 255, 255, 0.95);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    box-shadow: var(--shadow-md);
    animation: fadeIn 0.6s ease-out 0.2s both;
}

.info-banner i {
    color: var(--color-primary);
    font-size: 1.2rem;
}

.info-banner span {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

/* 検索コンテナ */
.search-container {
    position: relative;
    margin-bottom: var(--spacing-lg);
    animation: fadeIn 0.6s ease-out 0.3s both;
}

.search-container i {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-secondary);
    pointer-events: none;
}

#searchInput {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) 3rem;
    border: 2px solid rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.95);
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

#searchInput:focus {
    outline: none;
    border-color: white;
    background: white;
    box-shadow: var(--shadow-lg);
}

.clear-btn {
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

.clear-btn:hover {
    color: var(--color-danger);
    background: var(--color-bg);
}

/* 新規メモコンテナ */
.new-memo-container {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    animation: fadeIn 0.6s ease-out 0.4s both;
}

#newMemo {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    resize: vertical;
    min-height: 100px;
    transition: all 0.3s ease;
}

#newMemo:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
}

.memo-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-md);
}

.btn-primary {
    background: var(--color-primary);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.btn-primary:active {
    transform: translateY(0);
}

.memo-count {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.memo-count span {
    font-weight: 600;
    color: var(--color-primary);
}

/* メモリスト */
.memos-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.memo-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    animation: slideIn 0.4s ease-out;
}

.memo-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.memo-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: var(--spacing-sm);
    gap: var(--spacing-md);
}

.memo-meta {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    flex: 1;
}

.memo-timestamp {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.memo-expiry {
    font-size: 0.8rem;
    color: var(--color-warning);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.memo-expiry.expiring-soon {
    color: var(--color-danger);
    font-weight: 500;
}

.memo-content {
    color: var(--color-text-primary);
    font-size: 1rem;
    line-height: 1.7;
    white-space: pre-wrap;
    word-wrap: break-word;
    margin-bottom: var(--spacing-md);
}

.memo-actions-bottom {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
}

.btn-delete {
    background: none;
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: all 0.2s ease;
}

.btn-delete:hover {
    background: var(--color-danger);
    color: white;
    border-color: var(--color-danger);
}

/* 空の状態 */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-lg);
    background: rgba(255, 255, 255, 0.95);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    animation: fadeIn 0.6s ease-out;
}

.empty-state i {
    font-size: 4rem;
    color: var(--color-primary-light);
    margin-bottom: var(--spacing-md);
    opacity: 0.6;
}

.empty-state p {
    color: var(--color-text-secondary);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
}

.empty-state-sub {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    opacity: 0.7;
}

/* フッター */
.footer {
    text-align: center;
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
    animation: fadeIn 0.6s ease-out 0.6s both;
}

.footer i {
    margin-right: var(--spacing-xs);
}

/* アニメーション */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    body {
        padding: var(--spacing-md);
    }
    
    .logo {
        font-size: 2rem;
    }
    
    .logo i {
        font-size: 1.5rem;
    }
    
    .tagline {
        font-size: 1rem;
    }
    
    .new-memo-container {
        padding: var(--spacing-md);
    }
    
    .memo-card {
        padding: var(--spacing-md);
    }
    
    .memo-actions {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-sm);
    }
    
    .btn-primary {
        justify-content: center;
    }
    
    .memo-count {
        text-align: center;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 1.75rem;
        flex-direction: column;
        gap: var(--spacing-xs);
    }
    
    .info-banner {
        flex-direction: column;
        text-align: center;
    }
    
    .memo-header {
        flex-direction: column;
        align-items: start;
    }
}

/* ハイライト効果（検索結果用） */
.highlight {
    background-color: #fef08a;
    padding: 2px 4px;
    border-radius: 3px;
    font-weight: 500;
}

/* ローディング状態 */
.loading {
    opacity: 0.6;
    pointer-events: none;
}