body {
    font-family: 'SF Pro Display', sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e7eb 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
    width: 85%;
    margin: 20px auto;
    padding: 0 20px;
}

.content-wrapper {
    margin-top: 5%;
    display: flex;
    width: 100%;
    gap: 40px;
    justify-content: space-between;
}

.section {
    flex: 1;
    background: #ffffff;
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08),
                0 2px 6px rgba(0, 0, 0, 0.04);
    min-width: 0;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.section:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1),
                0 3px 10px rgba(0, 0, 0, 0.05);
}

textarea {
    width: 100%;
    font-size: 16px;
    padding: 15px;
    border: 2px solid #edf2f7;
    border-radius: 12px;
    resize: vertical;
    min-height: 120px;
    max-height: 300px;
    transition: all 0.3s ease;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

textarea:focus {
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
    outline: none;
}

button {
    padding: 12px 28px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 120px;
    background: linear-gradient(145deg, #3498db, #2980b9);
    color: white;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.2);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.3);
    background: linear-gradient(145deg, #3498db, #2573a7);
}

button:active {
    transform: translateY(1px);
}

h2 {
    color: #2c3e50;
    font-size: 24px;
    margin-bottom: 25px;
    padding-bottom: 12px;
    border-bottom: 2px solid #3498db;
    position: relative;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, #3498db, transparent);
}

.option-group {
    margin-bottom: 25px;
}

label {
    font-size: 15px;
    margin-bottom: 10px;
    color: #34495e;
    font-weight: 500;
    display: block;
}

/* 深色模式优化 */
body.dark-mode {
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
}

body.dark-mode .section {
    background-color: #2d2d2d;
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

body.dark-mode textarea {
    background-color: #363636;
    border-color: #404040;
    color: #e0e0e0;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

body.dark-mode textarea:focus {
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

body.dark-mode button {
    background: linear-gradient(145deg, #3498db, #2573a7);
}

body.dark-mode button:hover {
    background: linear-gradient(145deg, #3498db, #2980b9);
}

body.dark-mode h2 {
    color: #e0e0e0;
    border-bottom-color: #3498db;
}

body.dark-mode label {
    color: #b0b0b0;
}

/* 响应式优化 */
@media (max-width: 1200px) {
    main {
        width: 90%;
    }
}

@media (max-width: 968px) {
    main {
        width: 95%;
        padding: 15px;
        margin: 10px auto;
    }

    .content-wrapper {
        flex-direction: column;
        gap: 30px;
    }

    .section {
        width: 100%;
        padding: 25px;
    }
}

@media (max-width: 600px) {
    main {
        width: 100%;
        padding: 10px;
    }

    .section {
        padding: 20px;
        margin-bottom: 20px;
    }

    textarea {
        min-height: 100px;
    }

    .button-group {
        flex-wrap: wrap;
    }

    button {
        padding: 12px 24px;
        font-size: 15px;
        flex: 1 1 auto;
        min-width: 110px;
    }
}

.button-group {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 20px;
}