:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #ec4899;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --background: #f8fafc;
    --surface: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --sidebar-width: 280px;
    --header-height: 70px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 画面管理 */
.screen {
    display: none;
    min-height: 100vh;
}

.screen.active {
    display: block;
}

/* ログイン画面 */
#loginScreen {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 420px;
}

.login-card {
    background: var(--surface);
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
    animation: fadeInUp 0.6s ease-out;
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header i {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.login-header h1 {
    font-family: 'Noto Serif JP', serif;
    font-size: 32px;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.login-header p {
    color: var(--text-secondary);
    font-size: 14px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 14px;
}

.form-group label i {
    margin-right: 5px;
    color: var(--primary-color);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 15px;
    font-family: inherit;
    transition: var(--transition);
    background: var(--surface);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: inherit;
}

.btn i {
    font-size: 16px;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    width: 100%;
    justify-content: center;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

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

.btn-secondary:hover {
    background: var(--text-primary);
}

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

.btn-danger:hover {
    background: #dc2626;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 13px;
}

.error-message {
    margin-top: 15px;
    padding: 12px;
    background: #fee2e2;
    color: #dc2626;
    border-radius: 8px;
    font-size: 14px;
    display: none;
}

.error-message.show {
    display: block;
    animation: shake 0.5s;
}

.login-footer {
    margin-top: 20px;
    text-align: center;
}

.login-footer p {
    font-size: 13px;
    color: var(--text-secondary);
}

/* アプリケーション画面レイアウト */
#appScreen {
    display: flex;
    min-height: 100vh;
}

/* サイドバー */
.sidebar {
    width: var(--sidebar-width);
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    z-index: 1000;
    transition: var(--transition);
}

.sidebar-header {
    padding: 25px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-header h2 {
    font-family: 'Noto Serif JP', serif;
    font-size: 22px;
    color: var(--text-primary);
}

.sidebar-header i {
    margin-right: 8px;
    color: var(--primary-color);
}

.close-sidebar-btn {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 5px;
}

.sidebar-user {
    padding: 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
}

.sidebar-nav {
    flex: 1;
    padding: 20px 0;
    overflow-y: auto;
}

.nav-item {
    width: 100%;
    padding: 12px 20px;
    background: none;
    border: none;
    text-align: left;
    font-size: 15px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: inherit;
    border-left: 3px solid transparent;
}

.nav-item i {
    width: 20px;
    font-size: 18px;
}

.nav-item:hover {
    background: var(--background);
    color: var(--text-primary);
}

.nav-item.active {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    border-left-color: var(--primary-color);
    font-weight: 500;
}

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid var(--border);
}

/* メインコンテンツ */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.app-header {
    height: var(--header-height);
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 0 30px;
    display: flex;
    align-items: center;
    gap: 20px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-primary);
    cursor: pointer;
    padding: 5px;
}

.app-header h1 {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
}

.header-actions {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 15px;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box i {
    position: absolute;
    left: 15px;
    color: var(--text-secondary);
}

.search-box input {
    padding: 10px 15px 10px 40px;
    border: 2px solid var(--border);
    border-radius: 20px;
    width: 250px;
    font-size: 14px;
    transition: var(--transition);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    width: 300px;
}

/* コンテンツビュー */
.content-view {
    display: none;
    padding: 30px;
    flex: 1;
}

.content-view.active {
    display: block;
}

/* 日記グリッド */
.entries-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 25px;
}

.entry-card {
    background: var(--surface);
    border-radius: 15px;
    padding: 20px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

.entry-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.entry-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 15px;
}

.entry-date {
    font-size: 13px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 5px;
}

.entry-theme-badge {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
    color: white;
}

.entry-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.entry-content {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 15px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.entry-image {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: 10px;
    margin-bottom: 15px;
}

.entry-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag {
    padding: 4px 10px;
    background: var(--background);
    border-radius: 15px;
    font-size: 12px;
    color: var(--text-secondary);
}

/* 空の状態 */
.empty-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 64px;
    margin-bottom: 20px;
    opacity: 0.3;
}

.empty-state h3 {
    font-size: 24px;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.empty-state p {
    font-size: 16px;
}

/* タイムラインビュー */
.timeline-group {
    margin-bottom: 40px;
}

.timeline-header {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-color);
}

/* テーマビュー */
.themes-header {
    margin-bottom: 30px;
}

.themes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.theme-card {
    background: var(--surface);
    border-radius: 15px;
    padding: 25px;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: var(--transition);
    border-left: 4px solid;
}

.theme-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.theme-name {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 10px;
}

.theme-count {
    font-size: 14px;
    color: var(--text-secondary);
}

/* タグビュー */
.tags-container {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    padding: 20px;
}

.tag-cloud-item {
    padding: 12px 20px;
    background: var(--surface);
    border-radius: 25px;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

.tag-cloud-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: var(--primary-color);
    color: white;
}

.tag-count {
    background: rgba(0, 0, 0, 0.1);
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 12px;
}

/* モーダル */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(5px);
}

.modal.active {
    display: flex;
    animation: fadeIn 0.3s;
}

.modal-content {
    background: var(--surface);
    border-radius: 20px;
    width: 90%;
    max-width: 700px;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: slideUp 0.3s;
}

.modal-small {
    max-width: 450px;
}

.modal-header {
    padding: 25px 30px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h2 {
    font-size: 22px;
    font-weight: 600;
}

.close-modal {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 5px;
    transition: var(--transition);
}

.close-modal:hover {
    color: var(--text-primary);
    transform: rotate(90deg);
}

.modal-body {
    padding: 30px;
    overflow-y: auto;
    flex: 1;
}

.modal-actions {
    display: flex;
    gap: 10px;
    margin-top: 30px;
    justify-content: space-between;
}

.modal-actions-right {
    display: flex;
    gap: 10px;
}

/* 画像アップロード */
.image-upload-area {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.image-preview {
    display: none;
    position: relative;
}

.image-preview.active {
    display: block;
}

.image-preview img {
    width: 100%;
    max-height: 300px;
    object-fit: cover;
    border-radius: 10px;
}

.image-preview .remove-image {
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--danger-color);
    color: white;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* タグ候補 */
.tag-suggestions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 10px;
}

.tag-suggestion {
    padding: 6px 12px;
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: 15px;
    font-size: 13px;
    cursor: pointer;
    transition: var(--transition);
}

.tag-suggestion:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* カラーピッカー */
.color-picker {
    display: flex;
    align-items: center;
    gap: 10px;
}

.color-picker input[type="color"] {
    width: 60px;
    height: 40px;
    border: 2px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
}

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

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

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

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .close-sidebar-btn {
        display: block;
    }

    .main-content {
        margin-left: 0;
    }

    .menu-toggle {
        display: block;
    }

    .app-header {
        padding: 0 15px;
    }

    .app-header h1 {
        font-size: 18px;
    }

    .search-box input {
        width: 150px;
    }

    .search-box input:focus {
        width: 200px;
    }

    .content-view {
        padding: 15px;
    }

    .entries-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .themes-grid {
        grid-template-columns: 1fr;
    }

    .modal-content {
        width: 95%;
        max-height: 95vh;
    }

    .modal-body {
        padding: 20px;
    }

    .modal-actions {
        flex-direction: column;
    }

    .modal-actions-right {
        width: 100%;
    }

    .modal-actions button {
        flex: 1;
    }
}

/* スクロールバーのスタイリング */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--background);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}