:root {
    --primary-color: #1e88e5;
    --secondary-color: #43a047;
    --text-color: #333333;
    --background-color: #f8f8f8;
    --card-background: #ffffff;
    --border-radius: 8px;
    --header-gradient-start: #1976d2;
    --header-gradient-end: #42a5f5;
}

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

body {
    font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
    font-size: 18px;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

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

/* 大字体、高对比度设计 */
h1 {
    font-size: 38px;
    margin-bottom: 5px;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
}

h2 {
    font-size: 32px;
    margin-bottom: 20px;
}

h3 {
    font-size: 24px;
    margin-bottom: 15px;
}

p {
    font-size: 18px;
}

.large-text {
    font-size: 22px;
}

/* 增强的页眉样式 */
.enhanced-header {
    background: linear-gradient(to right, var(--header-gradient-start), var(--header-gradient-end));
    color: white;
    padding: 0;
    text-align: center;
    position: relative;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.decoration-top {
    height: 8px;
    background: repeating-linear-gradient(
        45deg,
        rgba(255, 255, 255, 0.1),
        rgba(255, 255, 255, 0.1) 10px,
        rgba(255, 255, 255, 0.2) 10px,
        rgba(255, 255, 255, 0.2) 20px
    );
}

.decoration-bottom {
    height: 8px;
    background: repeating-linear-gradient(
        -45deg,
        rgba(255, 255, 255, 0.1),
        rgba(255, 255, 255, 0.1) 10px,
        rgba(255, 255, 255, 0.2) 10px,
        rgba(255, 255, 255, 0.2) 20px
    );
}

.header-content {
    padding: 25px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-icon {
    font-size: 40px;
    width: 70px;
    height: 70px;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.3);
}

.title-group {
    text-align: left;
}

.subtitle-decoration {
    width: 80px;
    height: 3px;
    background-color: rgba(255, 255, 255, 0.5);
    margin: 8px 0;
}

.header-slogan {
    font-size: 22px;
    font-weight: 300;
    letter-spacing: 1px;
    padding: 8px 20px;
    border-radius: 30px;
    background-color: rgba(255, 255, 255, 0.15);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.1);
}

/* 欢迎区域 */
.welcome {
    text-align: center;
    padding: 40px 20px;
}

/* 按钮样式 */
.buttons {
    margin-top: 30px;
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    font-size: 22px;
    padding: 15px 30px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
}

.btn i {
    margin-right: 10px;
    font-size: 20px;
}

.primary {
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 4px 8px rgba(30, 136, 229, 0.3);
}

.primary:hover {
    background-color: #1565c0;
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(30, 136, 229, 0.4);
}

.secondary {
    background-color: var(--secondary-color);
    color: white;
    box-shadow: 0 4px 8px rgba(67, 160, 71, 0.3);
}

.secondary:hover {
    background-color: #2e7d32;
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(67, 160, 71, 0.4);
}

/* 特色区域 */
.features {
    padding: 40px 0;
    text-align: center;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.feature-card {
    background-color: var(--card-background);
    border-radius: var(--border-radius);
    padding: 30px 20px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s;
    border-top: 4px solid transparent;
}

.feature-card:nth-child(1) {
    border-top-color: #2196f3;
}

.feature-card:nth-child(2) {
    border-top-color: #f44336;
}

.feature-card:nth-child(3) {
    border-top-color: #ffc107;
}

.feature-card:nth-child(4) {
    border-top-color: #4caf50;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 20px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
    color: var(--primary-color);
    height: 70px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.feature-icon i {
    font-size: 48px;
}

/* 页脚样式 */
footer {
    background-color: #333;
    color: white;
    padding: 30px 0;
    text-align: center;
    margin-top: 40px;
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 100;
    overflow-y: auto;
}

.modal-content {
    background-color: white;
    margin: 20px auto;
    padding: 30px;
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 800px;
    position: relative;
}

.close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 30px;
    cursor: pointer;
}

/* 问卷样式 */
#survey-form {
    margin-top: 20px;
}

.survey-section {
    margin-bottom: 30px;
}

.question {
    margin-bottom: 25px;
}

.question-title {
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 15px;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.option {
    display: flex;
    align-items: center;
    gap: 10px;
}

input[type="radio"],
input[type="checkbox"] {
    width: 24px;
    height: 24px;
}

label {
    font-size: 18px;
}

textarea {
    width: 100%;
    padding: 15px;
    border: 1px solid #ccc;
    border-radius: var(--border-radius);
    font-size: 18px;
    font-family: inherit;
    min-height: 120px;
    margin-top: 15px;
}

.submit-btn {
    display: block;
    width: 100%;
    margin-top: 30px;
    padding: 15px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 22px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s;
}

.submit-btn:hover {
    background-color: #1565c0;
}

/* 媒体查询 - 响应式设计 */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        padding: 20px 0;
    }
    
    .logo-section {
        margin-bottom: 15px;
    }
    
    .header-slogan {
        margin-top: 10px;
    }
    
    h1 {
        font-size: 32px;
    }
    
    h2 {
        font-size: 28px;
    }
    
    h3 {
        font-size: 22px;
    }
    
    .btn {
        padding: 12px 24px;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
}