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

body {
    font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    line-height: 1.4;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 10px;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    min-height: calc(100vh - 20px);
    display: flex;
    flex-direction: column;
}

.header {
    text-align: center;
    color: white;
    margin-bottom: 15px;
    padding: 10px 0;
}

.header h1 {
    font-size: 1.8rem;
    margin-bottom: 5px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.header p {
    font-size: 0.95rem;
    opacity: 0.9;
}

.main-content {
    background: white;
    border-radius: 12px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.content-wrapper {
    flex: 1;
    display: flex;
    gap: 15px;
    padding: 20px;
    overflow: hidden;
}

.left-panel {
    flex: 0 0 320px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.right-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
}

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

.form-group label {
    margin-bottom: 4px;
    font-weight: 600;
    color: #333;
    font-size: 0.9rem;
}

.form-group input {
    padding: 8px 12px;
    border: 2px solid #e1e5e9;
    border-radius: 6px;
    font-size: 14px;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.1);
}

.form-row {
    display: flex;
    gap: 10px;
}

.upload-area {
    border: 2px dashed #667eea;
    border-radius: 6px;
    padding: 15px;
    text-align: center;
    background: #f8f9ff;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.85rem;
}

.upload-area:hover {
    border-color: #5a67d8;
    background: #f0f2ff;
}

.upload-area.dragover {
    border-color: #4c51bf;
    background: #e6f3ff;
}

.upload-icon {
    font-size: 1.5rem;
    color: #667eea;
    margin-bottom: 8px;
}

.upload-area p {
    margin: 2px 0;
}

.textarea-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.textarea-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.textarea-header label {
    font-weight: 600;
    color: #333;
    font-size: 0.9rem;
}

.file-upload-btn {
    background: #667eea;
    color: white;
    border: none;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: background 0.3s ease;
}

.file-upload-btn:hover {
    background: #5a67d8;
}

#markdownInput {
    flex: 1;
    padding: 15px;
    border: 2px solid #e1e5e9;
    border-radius: 6px;
    font-family: "Consolas", "Monaco", "Courier New", monospace;
    font-size: 13px;
    resize: none;
    line-height: 1.4;
    min-height: 300px;
}

#markdownInput:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.1);
}

.button-group {
    padding: 15px 20px;
    text-align: center;
    background: #f8f9fa;
    border-top: 1px solid #e1e5e9;
    display: flex;
    justify-content: center;
    gap: 15px;
}

.btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.3);
}

.btn:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}


.status {
    margin: 10px 20px;
    padding: 10px;
    border-radius: 6px;
    font-weight: 500;
    font-size: 0.9rem;
    display: none;
}

.status.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.status.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.status.loading {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

.loading-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid #f3f3f3;
    border-top: 2px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 8px;
}

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

.footer {
    text-align: center;
    color: white;
    padding: 15px 0;
    margin-top: auto;
    font-size: 0.85rem;
    opacity: 0.8;
}

.footer p {
    margin: 0;
}

@media (max-width: 1200px) {
    .content-wrapper {
        flex-direction: column;
        gap: 10px;
        padding: 15px;
    }

    .left-panel {
        flex: none;
        max-width: none;
    }

    .form-row {
        flex-direction: column;
        gap: 10px;
    }


    .button-group {
        flex-wrap: wrap;
        gap: 10px;
    }
}

@media (max-width: 768px) {
    body {
        padding: 5px;
    }

    .container {
        min-height: calc(100vh - 10px);
    }

    .header h1 {
        font-size: 1.5rem;
    }

    .btn {
        flex: 1;
        min-width: 120px;
    }

    .footer {
        padding: 10px 0;
        font-size: 0.8rem;
    }
}