:root {
    --primary-blue: #3176FF;
    --light-bg: #F9FAFB;
    --dark-text: #111827;
    --gray-text: #4B5563;
    --white: #FFFFFF;
    --light-gray: #E5E7EB;
    --success-green: #10B981;
    --yellow: #FACC15;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html, body {
    overflow-x: hidden; /* 隐藏水平滚动条 */
    width: 100%;       /* 确保宽度不超出视口 */
    max-width: 100vw;  /* 兼容性补充 */
}
body {
    font-family: 'Roboto', sans-serif;
    background-color: #f8fafc;
    color: var(--dark-text);
    line-height: 1.6;
}

/* 英雄区域样式 */
.hero-section {
    height: 372px;
    background: url("https://res.uusign.cn/PUBLIC/assets/img/index/heroBack.png") no-repeat center -80px;
    background-size: 90%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 20px;
}

/* 竖屏设备优化 */
@media (orientation: portrait) {
    .hero-section {
        height: 40vh;
        max-height: 600px;
        background-size: 90%;
        background-position: 30% 10%;
        margin-bottom: -10%;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: 16px;
    }

    .download-btn {
        width: 100%;
        max-width: 280px;
    }
}

.hero-content {
    max-width: 1280px;
    width: 100%;
    padding: 0 16px;
}

.hero-title {
    color: var(--white);
    font-size: 48px;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    max-width: 800px;
}

.hero-subtitle {
    color: var(--white);
    font-size: 20px;
    line-height: 1.4;
    margin-bottom: 40px;
    max-width: 700px;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 24px;
}

.download-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px 32px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.3s ease;
    min-width: 170px;
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.android-btn {
    background-color: #3176FF;
    color: var(--white);
}

.ios-btn {
    background-color: #42C22B;
    color: var(--white);
}

.btn-icon {
    margin-right: 12px;
    width: 20px;
    height: 20px;
}

/* 功能卡片区域 */
.features-section {
    margin: 0 auto;
    padding: 0px 20px 80px 20px;
}

.section-container {
    position: relative;
    padding-top: 80px;
}

.content-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 80px;
}

.inner-section {
    max-width: 1248px;
    margin: 0 auto;
}

.text-content {
    flex: 1;
    min-width: 300px;
    max-width: 576px;
}

.image-content {
    flex: 1;
    min-width: 410px;
    max-width: 384px;
}

.section-title {
    text-align: center;
    font-size: 36px;
    color: var(--dark-text);
    margin-bottom: 60px;
}

.section-description {
    font-size: 16px;
    line-height: 24px;
    color: var(--gray-text);
    margin-bottom: 24px;
}
a {
    text-decoration: none;
}
.section-link {
    display: inline-flex;
    align-items: center;
    color: var(--primary-blue);
    font-size: 16px;
    font-weight: 500;
    text-decoration: none;
    text-underline: none;
    transition: all 0.3s ease;
    margin-top: 8px;
}
.section-link span {
    text-decoration: none !important;
}

a span {
    text-decoration: none !important;
}
.section-link:hover {
    transform: translateX(5px);
}

.link-icon {
    margin-left: 8px;
    width: 14px;
    height: 12px;
}

.feature-image {
    width: 95%;
    height: auto;
    border-radius: 16px;
    object-fit: cover;
}

.features-title {
    text-align: center;
    font-size: 30px;
    font-weight: 700;
    line-height: 36px;
    color: var(--dark-text);
    margin: 100px 0 40px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.features-grid-study {

    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
}

.feature-card {
    background: var(--white);
    border-radius: 12px;
    padding: 30px 30px 15px 30px;
    transition: all 0.3s ease;
    height: 100%;
    overflow: hidden;
    background-color: var(--light-bg);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.feature-desc {
    font-size: 16px;
    line-height: 24px;
    color: var(--gray-text);
}

/* 页脚样式 */
.footer {
    background-color: #1f2937;
    color: #f9fafb;
    padding: 60px 20px 30px;
}


/* 特性展示区域 */
.features-showcase {
    padding: 80px 0;
}

.feature-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 80px;
    gap: 40px;
}

.feature-row:last-child {
    margin-bottom: 0;
}

.feature-title {
    font-size: 20px;
    font-weight: bold;
    line-height: 36px;
    color: var(--dark-text);
    margin-bottom: 12px;
}

.feature-description {
    font-size: 16px;
    line-height: 24px;
    color: var(--gray-text);
}

.reasons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
}

.reason-card {
    background: var(--light-bg);
    border-radius: 16px;
    padding: 32px 32px 16px 32px;
    transition: all 0.3s ease;
    height: 100%;
    position: relative;
}

.reason-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}


/* 大学生友好对接展示区 */
.student-section {
    background-color: var(--light-bg);
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 100px;
}

.icon-wrapper {
    width: 50px;
    height: 50px;
    background: rgba(49, 118, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 22px;
}

.card-title {
    font-size: 20px;
    font-weight: 600;
    line-height: 28px;
    color: var(--dark-text);
    margin-bottom: 14px;
}

.card-description {
    font-size: 16px;
    line-height: 24px;
    color: var(--gray-text);
}

/* 通用样式 */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 30px;
    font-weight: 700;
    line-height: 36px;
    color: var(--dark-text);
    margin-bottom: 16px;

    text-align: left;
}

.section-subtitle {
    font-size: 16px;
    line-height: 24px;
    color: var(--gray-text);
    max-width: 1000px;
    margin: 0 auto;
}

/* 价格卡片区域 */
.pricing-section {
    padding: 80px 0;
    background: var(--white);
}

.pricing-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    justify-content: center;
}

.pricing-card {
    background: var(--white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    position: relative;
}
.pricing-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.pricing-card.highlighted {
    border: 2px solid var(--primary-blue);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
}

.pricing-header {
    background: var(--light-bg);
    padding: 32px;
    text-align: center;
}

.pricing-title {
    font-size: 20px;
    font-weight: 600;
    line-height: 28px;
    margin-bottom: 16px;
}

.pricing-price {
    font-size: 36px;
    font-weight: 700;
    line-height: 40px;
    margin-bottom: 8px;
    color: var(--dark-text);
}

.pricing-description {
    font-size: 14px;
    line-height: 20px;
    color: var(--gray-text);
}

.pricing-features {
    padding: 28px;
}

.feature-item {
    display: flex;
    align-items: center;
    margin-bottom: 16px;
}

.feature-icon {
    width: 22px;
    height: 22px;
}

.feature-gou-icon {
    width: 12px;
    height: 12px;
    margin-right: 8px;
}

.feature-text {
    font-size: 16px;
    line-height: 24px;
    color: var(--dark-text);
}

.pricing-button {
    display: block;
    width: calc(100% - 64px);
    margin: 0 32px 32px;
    padding: 12px 0;
    text-align: center;
    font-size: 16px;
    font-weight: 500;
    line-height: 24px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.primary-button {
    background: var(--primary-blue);
    color: var(--white);
    border: none;
}

.primary-button:hover {
    background: #2563eb;
}

.outline-button {
    background: transparent;
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
}

.outline-button:hover {
    background: rgba(49, 118, 255, 0.05);
}

.recommended-badge {
    position: absolute;
    top: 18px;
    right: 18px;
    background: var(--primary-blue);
    color: var(--white);
    font-size: 14px;
    font-weight: 500;
    line-height: 20px;
    padding: 4px 12px;
    border-radius: 9999px;
}

/* 客户评价区域 */
.testimonials-section {
    padding: 80px 0;
    background: var(--light-bg);
}

.testimonial-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.testimonial-card {
    background: var(--white);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.testimonial-header {
    display: flex;
    align-items: center;
    margin-bottom: 24px;
}

.testimonial-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: #ddd;
    margin-right: 16px;
}

.testimonial-info {
    flex: 1;
}

.testimonial-name {
    font-size: 16px;
    font-weight: 600;
    line-height: 24px;
    margin-bottom: 4px;
}

.stars {
    display: flex;
}

.star {
    color: var(--yellow);
    margin-right: 4px;
}

.testimonial-content {
    font-size: 16px;
    line-height: 24px;
    color: var(--gray-text);
}

/* 页脚样式 */
.footer {
    background: #111827;
    color: #9CA3AF;
    padding: 80px 0 0;
    position: relative;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    padding-bottom: 60px;
}

.footer-column h3 {
    font-size: 18px;
    font-weight: 600;
    position: relative;
    padding-bottom: 12px;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 16px;
}

.footer-links a {
    color: #9CA3AF;
    text-decoration: none;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
}

.footer-links a:hover {
    color: #3176FF;
    transform: translateX(5px);
}

.footer-links i {
    margin-right: 12px;
    width: 16px;
    text-align: center;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-item {
    display: flex;
}

.contact-icon {
    margin-right: 6px;
}

.footer-bottom {
    border-top: 1px solid #1F2937;
    padding: 32px 0;
}

.footer-bottom-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

.copyright {
    font-size: 14px;
    line-height: 20px;
}

.social-icons {
    display: flex;
    gap: 24px;
}

.social-icon {
    color: #9CA3AF;
    font-size: 18px;
    transition: all 0.3s ease;
}

.social-icon:hover {
    color: #3176FF;
    transform: translateY(-3px);
}

.icon-white {
    filter: brightness(0) invert(1);
}

.icon-blue {
    filter: invert(32%) sepia(99%) saturate(2843%) hue-rotate(212deg) brightness(102%) contrast(96%);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: center;
    background: #fff;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    height: 65px;
}

.logo-nav-container {
    display: flex;
    align-items: center;
    padding-left: 16px;
    flex: 1;
}

.logo-link {
    display: flex;
    align-items: center;
}

.logo-img {
    width: 42px;
    height: auto;
}

.nav-links {
    display: flex;
    margin-left: 10px;
}

.nav-link {
    margin-left: 32px;
    color: #000000;
    text-decoration: none;
    font-size: 14px;
    padding: 4px 8px;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.nav-link:hover {
    color: #3176FF;
    background-color: rgba(24, 144, 255, 0.1);
}

.auth-buttons {
    display: flex;
    padding-right: 16px;
}

.login-btn, .register-btn {
    padding: 8px 22px;
    border-radius: 6px;
    font-size: 14px;
    text-decoration: none;
}

.login-btn {
    color: #3176FF;
    margin-right: 16px;
    border: 1px solid #3176FF;
}

.login-btn:hover {
    background-color: rgba(49, 118, 255, 0.05);
}

.register-btn {
    background: #3176FF;
    color: white;
}

.register-btn:hover {
    background: #3176FF;
}

.header-height {
    height: 65px;
}

/* 响应式调整 */
@media (max-width: 960px) {
    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .hero-buttons {
        flex-direction: column;
        gap: 16px;
    }

    .download-btn {
        width: 100%;
        max-width: 300px;
    }

    .content-row, .feature-row {
        flex-direction: column;
    }

    .text-content, .image-content {
        width: 100%;
        max-width: 100%;
    }

    .features-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }

    .feature-row:nth-child(even) .image-content {
        order: 1;
    }

    .feature-row:nth-child(even) .text-content {
        order: 2;
    }

    .reasons-grid {
        grid-template-columns: 1fr;
        max-width: 600px;
        margin: 0 auto;
    }

    .section-header {
        margin-bottom: 60px;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .section-header {
        margin-bottom: 60px;
    }

    .pricing-cards {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .hero-title {
        font-size: 28px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .nav-links {
        display: none;
    }

    .section-title, .features-title, .feature-title {
        font-size: 24px;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .feature-title {
        line-height: 30px;
    }

    .feature-description {
        font-size: 15px;
    }

    .section-title {
        font-size: 24px;
    }

    .card-title {
        font-size: 18px;
    }

    .card-description {
        font-size: 15px;
    }

    .section-title {
        font-size: 24px;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .card-title {
        font-size: 18px;
    }

    .card-description {
        font-size: 15px;
    }

    .pricing-cards, .testimonial-cards {
        grid-template-columns: 1fr;
    }

    .section-title {
        font-size: 24px;
    }

    .pricing-price {
        font-size: 30px;
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .footer-bottom-content {
        flex-direction: column;
        text-align: center;
    }

    .social-icons {
        justify-content: center;
    }

}
.section-title-2{
    font-size: 28px;
    font-weight: 900;
}

#backgr {
    background: white;
    width: 100vw;
    height: 4000px;
    position: absolute;
    float: left;
    z-index: -1;
    top: 890px;
}
.features-section,.features-showcase {
    z-index: 10;
}