/* General Styles */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: #f0f2f5;
    color: #333;
    margin: 0;
    padding: 0;
    height: 100vh;
    overflow: hidden;
}

.editor-header {
    background-color: #fff;
    padding: 15px 25px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #e0e0e0;
    flex-shrink: 0;
}

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

.editor-header h1 {
    margin: 0;
    font-size: 1.5em;
    color: #1c1e21;
}

/* Main Layout */
.editor-layout {
    display: flex;
    height: calc(100vh - 70px); /* 减去header高度 */
    overflow: hidden;
}

/* 左侧编辑器区域 (70%) */
.editor-section {
    width: 70%;
    padding: 20px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

/* 右侧预览区域 (30%) */
.preview-section {
    width: 30%;
    background-color: #fff;
    border-left: 1px solid #e0e0e0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.preview-container {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.preview-header {
    padding: 20px;
    border-bottom: 1px solid #e0e0e0;
    background-color: #f8f9fa;
    flex-shrink: 0;
}

.preview-header h2 {
    margin: 0;
    font-size: 1.2em;
    color: #333;
}

#preview-content {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.preview-placeholder {
    text-align: center;
    padding: 40px 20px;
    color: #666;
}

.placeholder-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.preview-placeholder p {
    margin: 10px 0;
    font-size: 14px;
}

.nav-link {
    text-decoration: none;
    color: #0866ff;
    font-weight: 500;
}

.card {
    background-color: #fff;
    border-radius: 8px;
    padding: 15px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

/* Question List Container - 上半部分 50% */
#question-list-container {
    height: 50%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Question Form Container - 下半部分 50% */
#question-form-container {
    height: 50%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* 编辑表单头部 */
#question-form-container h2 {
    margin: 0 0 15px 0;
    font-size: 1.2em;
    color: #333;
    flex-shrink: 0;
}

/* 题库列表头部 */
#question-list-container h2 {
    margin: 0 0 15px 0;
    font-size: 1.2em;
    color: #333;
    flex-shrink: 0;
}

/* 过滤按钮容器 */
.filter-buttons, .filter-type-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-bottom: 15px;
    flex-shrink: 0;
}

.filter-btn, .filter-type-btn {
    padding: 4px 8px;
    border: 1px solid #ddd;
    background: #fff;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.2s ease;
}

.filter-btn:hover, .filter-type-btn:hover {
    background: #f0f0f0;
}

.filter-btn.active, .filter-type-btn.active {
    background: #007bff;
    color: white;
    border-color: #007bff;
}

/* 题库列表滚动区域 */
#question-list {
    flex: 1;
    overflow-y: auto;
    margin: 0 -15px -15px -15px;
    padding: 0 15px 15px 15px;
}

#question-list li {
    padding: 10px 15px;
    margin-bottom: 5px;
    background: #f8f9fa;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    line-height: 1.4;
    border: 1px solid transparent;
    transition: all 0.2s ease;
}

#question-list li:hover {
    background: #e9ecef;
}

#question-list li.selected {
    background: #007bff;
    color: white;
    border-color: #0056b3;
}

/* 编辑表单滚动区域 */
#question-form {
    flex: 1;
    overflow-y: auto;
    margin: 0 -15px -15px -15px;
    padding: 0 15px 15px 15px;
}

/* Preview Question Styles */
.preview-question {
    background-color: #fff;
    border-radius: 8px;
    border: 1px solid #e0e0e0;
    overflow: hidden;
}

.preview-question-header {
    background-color: #f8f9fa;
    padding: 15px 20px;
    border-bottom: 1px solid #e0e0e0;
}

.preview-question-info {
    display: flex;
    gap: 10px;
}

.category-badge, .type-badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.category-badge {
    background-color: #007bff;
    color: white;
}

.type-badge {
    background-color: #28a745;
    color: white;
}

.preview-question-content {
    padding: 20px;
}

.preview-question-content p {
    margin: 0;
    font-size: 16px;
    line-height: 1.5;
    font-weight: 500;
}

.preview-media-container {
    padding: 0 20px;
}

.preview-options {
    list-style: none;
    padding: 0;
    margin: 20px 0;
}

.preview-options li {
    padding: 12px 20px;
    margin: 5px 0;
    background-color: #f8f9fa;
    border-left: 4px solid #007bff;
    border-radius: 4px;
    font-size: 14px;
    position: relative;
}

.preview-options li.correct {
    background-color: #d4edda;
    border-left-color: #28a745;
}

.preview-answer {
    padding: 20px;
    background-color: #e8f5e8;
    border-top: 1px solid #d4edda;
}

.preview-answer h4 {
    margin: 0 0 10px 0;
    color: #2e7d32;
    font-size: 14px;
}

.preview-answer p {
    margin: 0;
    font-weight: 500;
    color: #2e7d32;
}

.preview-explanation {
    padding: 20px;
    background-color: #fff3cd;
    border-top: 1px solid #ffeaa7;
}

.preview-explanation h4 {
    margin: 0 0 10px 0;
    color: #856404;
    font-size: 14px;
}

.preview-explanation p {
    margin: 0;
    font-size: 14px;
    line-height: 1.5;
    color: #856404;
}

.preview-info {
    padding: 20px;
    border-top: 1px solid #e0e0e0;
    background-color: #f8f9fa;
    flex-shrink: 0;
}

.info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid #e9ecef;
    font-size: 13px;
}

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

.info-item label {
    font-weight: 500;
    color: #666;
}

.info-item span {
    font-weight: 600;
    color: #333;
}

h2 {
    margin-top: 0;
    border-bottom: 1px solid #ddd;
    padding-bottom: 10px;
    margin-bottom: 15px;
    font-size: 1.2em;
    color: #333;
}

/* Editor Grid Layout */
.editor-grid {
    display: grid;
    grid-template-columns: 1fr 1.8fr;
    gap: 25px;
    align-items: start;
}

/* Question List */
#question-list-container {
    max-height: 80vh;
    overflow-y: auto;
}

.filter-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: 6px;
    margin-bottom: 15px;
}

.filter-buttons .filter-btn {
    padding: 8px 12px;
    border: 1px solid #ccc;
    background-color: #f0f2f5;
    cursor: pointer;
    border-radius: 6px;
    font-size: 0.9em;
    text-align: center;
    transition: all 0.2s ease;
}

.filter-buttons .filter-btn:hover {
    background-color: #e9ecef;
}

.filter-buttons .filter-btn.active {
    background-color: #0866ff;
    color: white;
    border-color: #0866ff;
    font-weight: 600;
}

.filter-type-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 6px;
    margin-bottom: 15px;
    margin-top: 10px;
}

.filter-type-buttons .filter-type-btn {
    padding: 8px 12px;
    border: 1px solid #ccc;
    background-color: #f0f2f5;
    cursor: pointer;
    font-size: 0.9em;
    border-radius: 6px;
    text-align: center;
    transition: all 0.2s ease;
}

.filter-type-buttons .filter-type-btn:hover {
    background-color: #e9ecef;
}

.filter-type-buttons .filter-type-btn.active {
    background-color: #28a745;
    color: white;
    border-color: #28a745;
    font-weight: 600;
}

#question-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

#question-list li {
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    margin-bottom: 8px;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s;
}

#question-list li:hover {
    background-color: #f0f2f5;
}

#question-list li.selected {
    background-color: #e7f3ff;
    border-color: #0866ff;
    font-weight: 600;
}

/* Question Form */
#question-form .form-group {
    margin-bottom: 12px;
}

#question-form .form-group-inline {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 12px;
}

#question-form .form-group-inline .form-group {
    margin-bottom: 0;
}

#question-form .form-group-triple {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 12px;
    margin-bottom: 12px;
}

#question-form .form-group-triple .form-group {
    margin-bottom: 0;
}

#question-form label {
    display: block;
    font-weight: 600;
    margin-bottom: 4px;
    font-size: 13px;
}

#question-form input[type="text"],
#question-form input[type="number"],
#question-form select,
#question-form textarea {
    width: 100%;
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 6px;
    box-sizing: border-box;
    font-size: 13px;
}

#question-form textarea {
    resize: vertical;
}

#options-container .option-item {
    display: grid;
    grid-template-columns: 20px 1fr 40px;
    gap: 8px;
    align-items: center;
    margin-bottom: 8px;
    padding: 6px;
    background-color: #f8f9fa;
    border-radius: 6px;
    border: 1px solid #e9ecef;
}

#options-container .option-item:hover {
    background-color: #f1f3f4;
    border-color: #dee2e6;
}

#options-container .option-item input[type="text"] {
    padding: 8px 12px;
    border: 1px solid #ced4da;
    border-radius: 4px;
    font-size: 0.95em;
}

#options-container .option-item .answer-checkbox {
    width: 20px;
    height: 20px;
    justify-self: center;
}

#options-container .option-item .remove-option-btn {
    background: #dc3545;
    border: none;
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1.1em;
    display: flex;
    align-items: center;
    justify-content: center;
    justify-self: end;
    transition: background-color 0.2s ease;
}

#options-container .option-item .remove-option-btn:hover {
    background: #c82333;
}

#add-option-btn {
    background: none;
    border: 1px dashed #ccc;
    color: #555;
    width: 100%;
    padding: 8px;
    margin-top: 5px;
    border-radius: 6px;
    transition: all 0.2s ease;
}

#add-option-btn:hover {
    background-color: #f8f9fa;
    border-color: #007bff;
    color: #007bff;
}

/* Media Inputs Styles */
.media-inputs {
    margin-top: 8px;
}

.media-input-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.media-input-group input[type="text"] {
    padding: 10px 12px;
    border: 1px solid #ced4da;
    border-radius: 6px;
    font-size: 0.95em;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.media-input-group input[type="text"]:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 2px rgba(0,123,255,0.25);
}

.form-actions {
    display: flex;
    gap: 8px;
    margin-top: 15px;
    border-top: 1px solid #ddd;
    padding-top: 15px;
}

.form-actions button {
    padding: 8px 16px;
    font-size: 13px;
}

#save-btn {
    background-color: #31a24c;
    color: white;
    flex-grow: 2;
}
#save-btn:hover {
    background-color: #2b8a40;
}

#new-question-btn {
    background-color: #e4e6eb;
}

#delete-btn {
    background-color: #fa383e;
    color: white;
}
#delete-btn:disabled {
    background-color: #fad2d2;
    color: #fff;
}

/* Responsive Design */
@media (max-width: 1400px) {
    .editor-grid {
        grid-template-columns: 1fr 1.6fr;
        gap: 20px;
    }
}

@media (max-width: 1200px) {
    body {
        padding: 20px 5%;
    }

    .editor-grid {
        grid-template-columns: 1fr 1.5fr;
        gap: 18px;
    }

    .filter-buttons {
        grid-template-columns: repeat(auto-fit, minmax(70px, 1fr));
    }

    .filter-type-buttons {
        grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
    }
}

@media (max-width: 992px) {
    body {
        padding: 15px 20px;
    }

    .editor-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    #question-form .form-group-inline {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    #question-form .form-group-triple {
        grid-template-columns: 1fr 1fr;
        gap: 15px;
    }

    .filter-buttons {
        grid-template-columns: repeat(3, 1fr);
    }

    .filter-type-buttons {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    .filter-buttons {
        grid-template-columns: repeat(2, 1fr);
    }

    .filter-type-buttons {
        grid-template-columns: 1fr;
    }

    #question-form .form-group-triple {
        grid-template-columns: 1fr;
    }

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

    .form-actions button {
        width: 100%;
    }
}