/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1e40af;
    --secondary-color: #f59e0b;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --background: #f8fafc;
    --white: #ffffff;
    --border: #e5e7eb;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    background: linear-gradient(135deg, var(--primary-color), #3b82f6);
    color: var(--white);
    padding: 1rem 0;
    box-shadow: var(--shadow);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    text-align: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.nav-logo i {
    font-size: 2rem;
    color: var(--secondary-color);
}

.nav-logo span {
    font-size: 1.8rem;
    font-weight: bold;
}

.nav-subtitle {
    font-size: 0.9rem;
    opacity: 0.9;
    font-style: italic;
}

/* 主要内容 */
.main-content {
    min-height: calc(100vh - 200px);
}

/* 统计面板 */
.stats-section {
    margin-bottom: 2rem;
}

.stats-section h2 {
    text-align: center;
    margin-top: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    font-size: 1.5rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), #3b82f6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.5rem;
}

.stat-number {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* 学习领域 */
.learning-areas {
    margin-bottom: 2rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.section-header h2 {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.areas-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
}

.area-card {
    background: var(--white);
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.area-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.area-header {
    padding: 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), #3b82f6);
    color: var(--white);
}

.area-icon {
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.area-header h3 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.area-progress {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.progress-bar {
    flex: 1;
    height: 8px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--secondary-color);
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 0%;
}

.progress-text {
    font-size: 0.9rem;
    font-weight: bold;
}

.goals-list {
    padding: 1rem;
    min-height: 100px;
}

.goal-item {
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 1rem;
    margin-bottom: 0.5rem;
    transition: all 0.2s ease;
}

.goal-item:hover {
    background: #f1f5f9;
    border-color: var(--primary-color);
}

.goal-item.completed {
    background: #ecfdf5;
    border-color: var(--success);
    opacity: 0.8;
}

.goal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.goal-title {
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
}

.goal-title.completed {
    text-decoration: line-through;
    color: var(--text-secondary);
}

.goal-priority {
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.8rem;
    font-weight: 500;
}

.goal-priority.high {
    background: #fee2e2;
    color: #dc2626;
}

.goal-priority.medium {
    background: #fef3c7;
    color: #d97706;
}

.goal-priority.low {
    background: #e0e7ff;
    color: #3730a3;
}

.goal-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.goal-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.goal-deadline {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.goal-deadline.overdue {
    color: var(--danger);
    font-weight: 500;
}

.goal-actions {
    display: flex;
    gap: 0.5rem;
}

.goal-actions button {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 0.25rem;
    transition: background-color 0.2s ease;
}

.goal-actions button:hover {
    background: rgba(0, 0, 0, 0.1);
}

.goal-actions .complete-btn {
    color: var(--success);
}

.goal-actions .delete-btn {
    color: var(--danger);
}

/* 按钮样式 */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

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

.btn-primary:hover {
    background: #1e3a8a;
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

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

.btn-secondary:hover {
    background: #4b5563;
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s ease;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--white);
    border-radius: 0.75rem;
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideIn 0.3s ease;
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    color: var(--primary-color);
    margin: 0;
}

.close {
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

.close:hover {
    color: var(--text-primary);
}

/* 表单样式 */
.form-group {
    margin-bottom: 1rem;
    padding: 0 1.5rem;
}

.form-group:first-child {
    padding-top: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    font-size: 0.9rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

.form-group textarea {
    min-height: 80px;
    resize: vertical;
}

.form-actions {
    padding: 1.5rem;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

/* 页脚 */
.footer {
    background: var(--primary-color);
    color: var(--white);
    text-align: center;
    padding: 1rem 0;
    margin-top: 2rem;
}

.beian {
    color: var(--white);
    text-decoration: none;
}
.beian:hover,
.beian:focus {
    text-decoration: none;
}

/* 动画 */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .nav-logo {
        flex-direction: column;
        gap: 0.25rem;
    }
    
    .nav-logo span {
        font-size: 1.5rem;
    }
    
    .nav-subtitle {
        font-size: 0.8rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .stat-card {
        padding: 1rem;
    }
    
    .stat-icon {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
    
    .section-header {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
    
    .areas-grid {
        grid-template-columns: 1fr;
    }
    
    .area-header {
        padding: 1rem;
    }
    
    .modal-content {
        width: 95%;
        margin: 1rem;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .btn {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: 1rem 0;
    }
    
    .areas-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .area-card {
        margin: 0;
    }
    
    .goal-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .goal-footer {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}

/* 空状态样式 */
.empty-state {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state p {
    margin-bottom: 1rem;
}

/* 加载状态 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid #f3f3f3;
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* 成功状态提示 */
.success-message {
    background: #ecfdf5;
    border: 1px solid #10b981;
    color: #065f46;
    padding: 1rem;
    border-radius: 0.5rem;
    margin: 1rem 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.error-message {
    background: #fef2f2;
    border: 1px solid #ef4444;
    color: #991b1b;
    padding: 1rem;
    border-radius: 0.5rem;
    margin: 1rem 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* 消息容器样式 */
.main-content > .container:first-child {
    margin-top: 1rem;
}

.main-content > .container .success-message,
.main-content > .container .error-message {
    margin: 0;
}