:root {
    --primary-green: #a8e6cf;
    --secondary-green: #88d8a3;
    --accent-green: #7fcdcd;
    --light-green: #dcedc1;
    --text-dark: #2d3436;
    --text-light: #636e72;
    --border-light: #e8f5e8;
    --error-bg: rgba(255, 107, 107, 0.2);
    --error-color: #ff6b6b;
    --shadow: 0 2px 8px rgba(168, 230, 207, 0.3);
    --shadow-hover: 0 4px 16px rgba(168, 230, 207, 0.4);
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #f8fbf8 0%, #e8f5e8 100%);
    color: var(--text-dark);
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    text-align: center;
    margin-bottom: 24px;
}

.header h1 {
    margin: 0;
    font-size: 28px;
    font-weight: 600;
    color: var(--text-dark);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.form-card {
    background: white;
    border-radius: 16px;
    box-shadow: var(--shadow);
    padding: 32px;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 20px;
    border: 1px solid var(--border-light);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-weight: 500;
    color: var(--text-dark);
    font-size: 14px;
}

.form-input {
    padding: 12px 16px;
    border: 2px solid var(--border-light);
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.2s ease;
    background: #fafafa;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-green);
    box-shadow: 0 0 0 3px rgba(168, 230, 207, 0.2);
    background: white;
}

.stats {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 16px;
    background: var(--light-green);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    transition: background-color 0.2s ease;
}

.stats.error {
    background: var(--error-bg);
}

.stats.error .char-count {
    color: var(--error-color);
}

.char-count {
    color: var(--text-dark);
    transition: color 0.2s ease;
}

.char-count.error {
    color: var(--error-color);
}

.limit-input {
    width: 80px;
    padding: 4px 8px;
    border: 1px solid var(--border-light);
    border-radius: 4px;
    font-size: 14px;
}


.editor-toolbar {
    display: flex;
    justify-content: flex-end;
}

.toolbar-btn {
    align-self: flex-end;
    padding: 8px 16px;
    background: linear-gradient(135deg, var(--primary-green), var(--secondary-green));
    color: var(--text-dark);
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow);
}

.toolbar-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

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

.editor-container {
    position: relative;
    flex: 1;
    min-height: 300px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

.highlighter, .editor {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    padding: 16px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 14px;
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.highlighter {
    color: transparent;
    border: none;
    background: #f8fffe;
    overflow-y: auto;
    pointer-events: none;
}

.editor {
    background: transparent;
    border: 2px solid var(--border-light);
    color: var(--text-dark);
    resize: none;
    outline: none;
    transition: border-color 0.2s ease;
}

.editor:focus {
    border-color: var(--primary-green);
}

.exceed {
    background-color: var(--error-bg);
    border-radius: 3px;
}

.password-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.related-list {
    display: flex; 
    flex-direction: column;
}

.related-item {
    background: white;
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 8px;
    flex: 1;
    gap: 8px;
    border: 1px solid var(--border-light);
    display: flex;
    flex-direction: row-reverse;
}

.submit-btn {
    align-self: center;
    padding: 12px 32px;
    background: linear-gradient(135deg, var(--primary-green), var(--secondary-green));
    color: var(--text-dark);
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow);
}

.add-btn {
    align-self: center;
    padding: 12px 32px;
    background: linear-gradient(135deg, var(--primary-green), var(--secondary-green));
    color: var(--text-dark);
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow);
}

.related-link {
    flex: 1;
}

.delete-btn {
    align-self: center;
    padding: 12px 32px;
    background: linear-gradient(135deg, var(--primary-green), var(--secondary-green));
    color: var(--text-dark);
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow);
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

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

.submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Modal styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-overlay.hidden {
    display: none;
}

.modal-overlay[hidden] {
    display: none;
}

.modal {
    background: white;
    border-radius: 16px;
    padding: 32px;
    max-width: 500px;
    width: 90%;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.modal h2 {
    margin: 0 0 16px 0;
    color: var(--text-dark);
}

.modal p {
    margin: 16px 0;
    color: var(--text-light);
}

.modal-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.modal-buttons {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 16px;
}

.modal-btn {
    padding: 8px 16px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.modal-btn.primary {
    background: var(--primary-green);
    color: var(--text-dark);
}

.modal-btn.secondary {
    background: #f1f3f4;
    color: var(--text-dark);
}

.modal-btn:hover {
    transform: translateY(-1px);
}

.error-message {
    color: var(--error-color);
    font-size: 12px;
    margin-top: 4px;
}

.error-message.hidden {
    display: none;
}

.loading-spinner {
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--primary-green);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

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

@media (max-width: 768px) {
    .container {
        padding: 16px;
    }

    .form-card {
        padding: 24px;
    }

    .header h1 {
        font-size: 24px;
    }

    .password-row {
        grid-template-columns: 1fr;
    }

    .stats {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .highlighter, .editor {
        font-size: 13px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 12px;
    }

    .form-card {
        padding: 20px;
    }

    .header h1 {
        font-size: 20px;
    }
}

.home-link {
    color: inherit;
    text-decoration: none;
}

.home-link:hover {
    text-decoration: underline;
}

.header h1 {
    margin: 0 0 8px 0;
    font-size: 28px;
    font-weight: 600;
    color: var(--text-dark);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.help-link {
    margin: 0;
    font-size: 13px;
    color: var(--text-light);
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px;
    border-radius: 16px;
    background: rgba(168, 230, 207, 0.1);
    border: 1px solid transparent;
}

.help-link:hover {
    color: var(--text-dark);
    background: rgba(168, 230, 207, 0.2);
    border-color: var(--primary-green);
}

.help-icon {
    font-size: 12px;
}

.memo-list-divider {
    margin: 32px 0 24px 0;
    border: none;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-light), transparent);
    position: relative;
}

.memo-list-divider::after {
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    background: white;
    padding: 0 16px;
    font-size: 12px;
    color: var(--text-light);
    font-weight: 500;
}

.memo-list {
    margin-top: 0;
}

.memo-list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.memo-list-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-dark);
    margin: 0;
}

.memo-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: #f8fffe;
    border: 1px solid var(--border-light);
    border-radius: 8px;
    margin-bottom: 8px;
    transition: all 0.2s ease;
    cursor: pointer;
}

.memo-item:hover {
    background: var(--light-green);
    border-color: var(--primary-green);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(168, 230, 207, 0.2);
}

.memo-item-content {
    flex: 1;
    min-width: 0;
}

.memo-item-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dark);
    margin: 0 0 4px 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.memo-item-date {
    font-size: 12px;
    color: var(--text-light);
    margin: 0;
}

.memo-item-actions {
    display: flex;
    gap: 8px;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.memo-item:hover .memo-item-actions {
    opacity: 1;
}

.memo-action-btn {
    padding: 4px 8px;
    font-size: 11px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: 500;
}

.memo-action-view {
    background: var(--primary-green);
    color: var(--text-dark);
}

.memo-action-edit {
    background: var(--secondary-green);
    color: var(--text-dark);
}

.memo-action-btn:hover {
    transform: translateY(-1px);
}

.memo-list-empty {
    text-align: center;
    padding: 24px;
    color: var(--text-light);
    font-size: 14px;
    background: #f8fffe;
    border: 1px dashed var(--border-light);
    border-radius: 8px;
}

.memo-list-empty-icon {
    font-size: 24px;
    margin-bottom: 8px;
    display: block;
}

@media (max-width: 768px) {
    .memo-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .memo-item-actions {
        opacity: 1;
        align-self: flex-end;
    }
}

.add-btn:disabled {
    background-color: #ccc;
    color: #666;
    cursor: not-allowed;
}

/* 関連リンク機能の改善CSS */

/* 関連リンク追加フォーム */
.related-add-form {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
}

.related-add-form .form-input {
    flex: 1;
    min-width: 0;
}

.add-btn {
    padding: 8px 16px;
    background: #f1f3f4;
    color: var(--text-dark);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    min-width: 60px;
}

.add-btn:hover:not(:disabled) {
    background: #e8f0fe;
    border-color: var(--primary-green);
}

.add-btn:disabled {
    background: #e0e0e0;
    color: #999;
    cursor: not-allowed;
}

/* 関連リンクリスト */
.related-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 300px;
    overflow-y: auto;
}

.related-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: #f9f9f9;
    border: 1px solid var(--border-light);
    border-radius: 8px;
}

.related-link {
    flex: 1;
    font-size: 14px;
    color: var(--text-dark);
    word-break: break-all;
    font-family: 'Consolas', 'Monaco', monospace;
    background: white;
    padding: 4px 8px;
    border-radius: 4px;
    border: 1px solid #ddd;
}

.delete-btn {
    padding: 6px 12px;
    background: #f8f9fa;
    color: #666;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
}

.delete-btn:hover {
    background: #ffe6e6;
    border-color: #ffb3b3;
    color: #cc0000;
}

/* 関連リンクセクション全体 */
#relatedSection {
    border-top: 1px solid var(--border-light);
    padding-top: 20px;
    margin-top: 20px;
}

#relatedSection label {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
}

#relatedSection label::before {
    content: "🔗";
    font-size: 16px;
}

/* 関連リンク数の表示 */
.related-count {
    font-size: 12px;
    color: var(--text-light);
    margin-left: auto;
    padding: 2px 8px;
    background: rgba(168, 230, 207, 0.2);
    border-radius: 12px;
}

/* 空の状態 */
.related-list-empty {
    text-align: center;
    padding: 20px;
    color: var(--text-light);
    font-size: 14px;
    background: #f8fffe;
    border: 1px dashed var(--border-light);
    border-radius: 8px;
}

.related-list-empty-icon {
    font-size: 20px;
    margin-bottom: 8px;
    display: block;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .related-add-form {
        flex-direction: column;
    }

    .add-btn {
        align-self: flex-end;
        min-width: 80px;
    }

    .related-item {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }

    .delete-btn {
        align-self: flex-end;
        width: fit-content;
    }
}

@media (max-width: 480px) {
    .related-link {
        font-size: 12px;
        padding: 6px;
    }

    .related-item {
        padding: 10px 12px;
    }
}


.search-results {
    list-style: none;
    margin: 0;
    padding: 0;
    max-height: 260px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.search-result-button {
    width: 100%;
    text-align: left;
    padding: 8px 10px;
    border-radius: 8px;
    border: 1px solid #ddd;
    background: #fff;
    cursor: pointer;
}

.search-empty {
    color: #666;
    padding: 4px 2px;
}