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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.login-box {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    width: 100%;
    max-width: 400px;
    overflow: hidden;
}

.logo {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: 40px 20px;
}

.logo h1 {
    font-size: 32px;
    margin-bottom: 10px;
    font-weight: 600;
}

.logo p {
    font-size: 14px;
    opacity: 0.9;
}

.form-container {
    padding: 30px;
}

.tab-buttons {
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
}

.tab-btn {
    flex: 1;
    padding: 12px;
    border: none;
    background: #f0f0f0;
    cursor: pointer;
    font-size: 15px;
    border-radius: 8px;
    transition: all 0.3s;
}

.tab-btn.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.form {
    display: none;
}

.form.active {
    display: block;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    color: #555;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 15px;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
}

.btn-primary {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

/* App页面 */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background: white;
    border-radius: 15px;
    margin-bottom: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header h2 {
    color: #667eea;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.btn-logout {
    padding: 8px 16px;
    background: #ff4757;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 20px;
}

@media (max-width: 768px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

.sidebar {
    background: white;
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.sidebar h3 {
    margin-bottom: 15px;
    color: #333;
}

.novel-list {
    list-style: none;
}

.novel-item {
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    margin-bottom: 8px;
    transition: background 0.2s;
}

.novel-item:hover, .novel-item.active {
    background: #f0f0f0;
}

.novel-item.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-create {
    width: 100%;
    padding: 12px;
    margin-top: 15px;
    background: #2ed573;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 15px;
}

.editor-area {
    background: white;
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid #eee;
}

.novel-title {
    font-size: 20px;
    font-weight: 600;
    color: #333;
}

.btn-ai-write {
    padding: 10px 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

.content-area {
    min-height: 400px;
    padding: 15px;
    background: #f9f9f9;
    border-radius: 10px;
    margin-bottom: 15px;
}

.content-area textarea {
    width: 100%;
    min-height: 400px;
    border: none;
    background: transparent;
    font-size: 16px;
    line-height: 1.8;
    resize: vertical;
}

.content-area textarea:focus {
    outline: none;
}

.ai-panel {
    background: #f0f0f0;
    border-radius: 10px;
    padding: 15px;
}

.ai-panel h4 {
    margin-bottom: 10px;
    color: #667eea;
}

.ai-suggestions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 15px;
}

.suggestion-btn {
    padding: 8px 15px;
    background: white;
    border: 1px solid #ddd;
    border-radius: 20px;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.2s;
}

.suggestion-btn:hover {
    border-color: #667eea;
    color: #667eea;
}

.btn-apply-suggestion {
    width: 100%;
    padding: 12px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

.loading {
    text-align: center;
    padding: 20px;
    color: #667eea;
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 15px;
    padding: 30px;
    width: 90%;
    max-width: 500px;
}

.modal-content h3 {
    margin-bottom: 20px;
    color: #333;
}

.modal-content .form-group {
    margin-bottom: 15px;
}

.modal-content input,
.modal-content textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
}

.modal-content textarea {
    min-height: 80px;
    resize: vertical;
}

.modal-buttons {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.modal-buttons button {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 15px;
}

.btn-cancel {
    background: #ddd;
    color: #333;
}

.btn-confirm {
    background: #667eea;
    color: white;
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #999;
}

.empty-state p {
    margin-bottom: 20px;
}

.btn-new-novel {
    padding: 12px 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}