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

body {
    font-family: 'Arial', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

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

header {
    text-align: center;
    color: white;
    margin-bottom: 40px;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

main {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 30px;
    margin-bottom: 40px;
}

.memo-form, .memo-list {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    backdrop-filter: blur(10px);
}

.memo-form h2, .memo-list h2 {
    margin-bottom: 20px;
    color: #4a5568;
    font-size: 1.5rem;
    border-bottom: 2px solid #667eea;
    padding-bottom: 10px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: #4a5568;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    width: 100%;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

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

.memo-container {
    max-height: 600px;
    overflow-y: auto;
}

.memo-item {
    background: #f7fafc;
    border-left: 4px solid #667eea;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 15px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.memo-item:hover {
    transform: translateX(5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.memo-item h3 {
    color: #2d3748;
    margin-bottom: 8px;
    font-size: 1.2rem;
}

.memo-item p {
    color: #4a5568;
    margin-bottom: 10px;
    line-height: 1.5;
}

.memo-time {
    font-size: 0.9rem;
    color: #718096;
    font-style: italic;
}

.btn-delete {
    background: #e53e3e;
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.8rem;
    cursor: pointer;
    margin-top: 10px;
    transition: background-color 0.3s ease;
}

.btn-delete:hover {
    background: #c53030;
}

.no-memos {
    text-align: center;
    color: #a0aec0;
    font-style: italic;
    padding: 40px;
}

footer {
    text-align: center;
    color: white;
    opacity: 0.8;
    font-size: 0.9rem;
}

.success-message, .error-message {
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    text-align: center;
    font-weight: bold;
}

.success-message {
    background: #c6f6d5;
    color: #22543d;
    border: 1px solid #9ae6b4;
}

.error-message {
    background: #fed7d7;
    color: #742a2a;
    border: 1px solid #fc8181;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    main {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .memo-form, .memo-list {
        padding: 20px;
    }
    
    .memo-item {
        padding: 15px;
    }
    
    .btn-primary {
        padding: 10px 20px;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.8rem;
    }
    
    .memo-form, .memo-list {
        padding: 15px;
    }
    
    .form-group input,
    .form-group textarea {
        padding: 10px;
    }
    
    .memo-item {
        padding: 12px;
    }
    
    .memo-item h3 {
        font-size: 1.1rem;
    }
}