/* 全局样式与变量定义 */
:root {
    --primary-color: #0b3d91;
    --secondary-color: #1cb5e0;
    --accent-color: #ff3e6d;
    --dark-color: #0a1128;
    --text-color: #eef4f7;
    --light-text: #a3b5c1;
    --background-color: #1a1a2e;
    --card-bg: rgba(26, 26, 46, 0.8);
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    --neon-glow: 0 0 10px rgba(28, 181, 224, 0.8);
    --heading-font: 'Orbitron', sans-serif;
    --body-font: 'Roboto', sans-serif;
}

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

body {
    font-family: var(--body-font);
    color: var(--text-color);
    background-color: var(--background-color);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--heading-font);
    font-weight: 700;
    letter-spacing: 1px;
}

a {
    text-decoration: none;
    color: var(--secondary-color);
    transition: all 0.3s ease;
}

a:hover {
    color: var(--accent-color);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 30px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    cursor: pointer;
    font-family: var(--heading-font);
}

.btn-outline {
    border: 2px solid var(--secondary-color);
    color: var(--secondary-color);
    background-color: transparent;
}

.btn-outline:hover {
    background-color: var(--secondary-color);
    color: var(--dark-color);
    box-shadow: var(--neon-glow);
}

.btn-primary {
    background-color: var(--secondary-color);
    color: var(--dark-color);
    border: 2px solid var(--secondary-color);
    font-weight: 700;
}

.btn-primary:hover {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    box-shadow: var(--neon-glow);
    transform: translateY(-2px);
}

.btn-large {
    padding: 15px 30px;
    font-size: 1rem;
}

/* 导航栏样式 */
.navbar {
    background-color: rgba(10, 17, 40, 0.9);
    backdrop-filter: blur(10px);
    padding: 20px 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.navbar.scrolled {
    padding: 15px 0;
    box-shadow: var(--shadow);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.logo-text {
    font-family: var(--heading-font);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-color);
    letter-spacing: 2px;
    background: linear-gradient(to right, var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.team-name {
    font-size: 0.8rem;
    color: var(--light-text);
    letter-spacing: 3px;
    margin-top: -5px;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-link {
    color: var(--light-text);
    font-family: var(--heading-font);
    font-size: 0.9rem;
    letter-spacing: 1px;
    position: relative;
}

.nav-link:hover {
    color: var(--secondary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--secondary-color);
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

.auth-buttons {
    display: flex;
    gap: 15px;
}

/* 英雄区域样式 */
.hero {
    padding: 180px 0 100px;
    min-height: 100vh;
    position: relative;
    overflow: hidden;
    background: radial-gradient(ellipse at bottom, var(--dark-color) 0%, var(--background-color) 100%);
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
    z-index: 2;
}

.hero-content {
    max-width: 600px;
    text-align: left;
    position: relative;
    z-index: 3;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    line-height: 1.2;
    animation: fadeInUp 1s ease;
}

.highlight {
    background: linear-gradient(to right, var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--light-text);
    margin-bottom: 40px;
    max-width: 500px;
    animation: fadeInUp 1s ease 0.2s forwards;
    opacity: 0;
}

/* 倒计时样式 */
.countdown {
    margin: 40px 0;
    animation: fadeInUp 1s ease 0.4s forwards;
    opacity: 0;
}

.countdown p {
    color: var(--light-text);
    margin-bottom: 15px;
    font-size: 0.9rem;
    letter-spacing: 2px;
}

.countdown-timer {
    display: flex;
    gap: 15px;
}

.countdown-item {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px 20px;
    min-width: 80px;
    text-align: center;
    box-shadow: var(--shadow);
    backdrop-filter: blur(5px);
}

.countdown-item span:first-child {
    font-family: var(--heading-font);
    font-size: 2rem;
    font-weight: 700;
    color: var(--secondary-color);
    display: block;
}

.countdown-item span:last-child {
    font-size: 0.8rem;
    color: var(--light-text);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* 行动按钮 */
.cta-buttons {
    display: flex;
    gap: 20px;
    margin-top: 30px;
    animation: fadeInUp 1s ease 0.6s forwards;
    opacity: 0;
}

/* 星球背景 */
.planet-container {
    position: relative;
    width: 500px;
    height: 500px;
    animation: float 6s ease-in-out infinite;
}

.planet {
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 30% 30%, 
        var(--secondary-color) 0%, 
        var(--primary-color) 30%, 
        var(--dark-color) 70%);
    border-radius: 50%;
    box-shadow: 
        0 0 60px rgba(28, 181, 224, 0.5),
        0 0 100px rgba(28, 181, 224, 0.3),
        0 0 140px rgba(28, 181, 224, 0.1);
    position: relative;
    overflow: hidden;
}

.planet::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.8) 0%, rgba(255,255,255,0) 70%);
    opacity: 0.1;
    transform: rotate(30deg);
}

/* 部分通用样式 */
.section {
    padding: 100px 0;
    position: relative;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 15px;
    background: linear-gradient(to right, var(--text-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--light-text);
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
    letter-spacing: 1px;
}

/* 系统特性部分 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.feature-card {
    background-color: var(--card-bg);
    border-radius: 15px;
    padding: 40px 30px;
    text-align: center;
    border: 1px solid var(--border-color);
    backdrop-filter: blur(5px);
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4);
    border-color: rgba(28, 181, 224, 0.3);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    display: inline-block;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--text-color);
}

.feature-card p {
    color: var(--light-text);
    font-size: 0.95rem;
}

/* 核心技术部分 - 标签导航 */
.tech-tabs {
    margin-top: 60px;
}

.tab-nav-container {

    position: relative;
    margin-bottom: 40px;
}

.tab-nav-wrapper {
    position: relative;
    overflow: hidden;
    border-radius: 50px;
}

.tab-nav {
    display: flex;
    position: relative;
    z-index: 2;
    background-color: rgba(10, 17, 40, 0.7);
    border-radius: 50px;
    padding: 5px;
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.tab-nav-highlight {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background: linear-gradient(90deg, 
        rgba(28, 181, 224, 0.2) 0%, 
        rgba(255, 62, 109, 0.2) 100%);
    border-radius: 50px;
    z-index: 1;
    transition: transform 0.3s cubic-bezier(0.65, 0, 0.35, 1);
}

.tab-link {
    flex: 1;
    padding: 15px 20px;
    background: none;
    border: none;
    color: var(--light-text);
    font-family: var(--heading-font);
    font-size: 0.9rem;
    letter-spacing: 1px;
    cursor: pointer;
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: all 0.3s ease;
}

.tab-link.active {
    color: var(--text-color);
}

.tab-icon {
    font-size: 1.5rem;
    margin-bottom: 8px;
    transition: all 0.3s ease;
}

.tab-link.active .tab-icon {
    transform: translateY(-5px);
}

.tab-text {
    transition: all 0.3s ease;
}

.tab-underline {
    height: 2px;
    width: 0;
    background: linear-gradient(90deg, var(--secondary-color), var(--accent-color));
    margin-top: 8px;
    transition: width 0.3s ease;
}

.tab-link.active .tab-underline {
    width: 40px;
}

/* 标签内容区域 */
.tab-content {
    background-color: var(--card-bg);
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(5px);
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: flex;
    gap: 40px;
}

.tech-content {
    flex: 1;
}

.tech-content h3 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--secondary-color);
}

.tech-content p {
    color: var(--light-text);
    margin-bottom: 30px;
    line-height: 1.8;
}

.tech-visual {
    flex: 1;
    min-height: 300px;
}

.tech-image-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, 
        rgba(28, 181, 224, 0.1) 0%, 
        rgba(255, 62, 109, 0.1) 100%);
    border-radius: 15px;
    border: 1px dashed var(--secondary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--light-text);
    font-style: italic;
}

.tech-specs {
    display: flex;
    gap: 20px;
    margin-top: 30px;
}

.spec-item {
    background-color: rgba(10, 17, 40, 0.7);
    border-radius: 10px;
    padding: 15px;
    flex: 1;
    text-align: center;
    border: 1px solid var(--border-color);
    backdrop-filter: blur(5px);
}

.spec-value {
    font-family: var(--heading-font);
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(to right, var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: block;
    line-height: 1;
}

.spec-label {
    font-size: 0.9rem;
    color: var(--light-text);
    display: block;
    margin-top: 5px;
}

/* 关于O₂团队部分 */
.about-section {
    background: linear-gradient(to bottom, var(--background-color) 0%, var(--dark-color) 100%);
}

.about-content {
    display: flex;
    gap: 60px;
    align-items: center;
}

.about-text {
    flex: 1;
}

.about-text h3 {
    font-size: 1.8rem;
    color: var(--secondary-color);
    margin-bottom: 20px;
}

.about-text p {
    color: var(--light-text);
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-image {
    flex: 1;
    min-height: 400px;
}

.image-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, 
        rgba(28, 181, 224, 0.1) 0%, 
        rgba(255, 62, 109, 0.1) 100%);
    border-radius: 15px;
    border: 1px dashed var(--secondary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--light-text);
    font-style: italic;
}

.about-stats {
    display: flex;
    gap: 20px;
    margin-top: 40px;
}

.stat-item {
    text-align: center;
    flex: 1;
}

.stat-value {
    font-family: var(--heading-font);
    font-size: 2rem;
    font-weight: 700;
    color: var(--secondary-color);
    display: block;
    margin-bottom: 5px;
}

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

/* 下载体验部分 */
.download-section {
    background-color: var(--dark-color);
}

.download-cards {
    display: flex;
    gap: 30px;
    margin-top: 50px;
}

.download-card {
    background-color: var(--card-bg);
    border-radius: 15px;
    padding: 30px;
    flex: 1;
    border: 1px solid var(--border-color);
    backdrop-filter: blur(5px);
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
}

.download-card.highlighted {
    border: 1px solid var(--secondary-color);
    transform: translateY(-20px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.download-card.highlighted .card-header {
    border-bottom-color: var(--secondary-color);
}

.card-header {
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h3 {
    font-size: 1.5rem;
    color: var(--text-color);
}

.card-badge {
    background-color: var(--secondary-color);
    color: var(--dark-color);
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-family: var(--heading-font);
}

.card-content {
    flex: 1;
    margin-bottom: 30px;
}

.card-content p {
    color: var(--light-text);
    margin-bottom: 20px;
}

.card-features {
    list-style: none;
}

.card-features li {
    color: var(--light-text);
    margin-bottom: 10px;
    position: relative;
    padding-left: 20px;
}

.card-features li::before {
    content: '✓';
    color: var(--secondary-color);
    position: absolute;
    left: 0;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.file-size {
    font-size: 0.8rem;
    color: var(--light-text);
}

/* 联系我们部分 */
.contact-content {
    display: flex;
    gap: 60px;
    margin-top: 50px;
}

.contact-info {
    flex: 1;
}

.contact-info h3 {
    font-size: 1.8rem;
    color: var(--secondary-color);
    margin-bottom: 20px;
}

.contact-info p {
    color: var(--light-text);
    margin-bottom: 30px;
    line-height: 1.8;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.info-icon {
    font-size: 1.2rem;
}

.info-text {
    color: var(--light-text);
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 40px;
    flex-wrap: wrap;
}

.social-link {
    color: var(--secondary-color);
    border: 1px solid var(--secondary-color);
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.social-link:hover {
    background-color: var(--secondary-color);
    color: var(--dark-color);
}

.contact-form {
    flex: 1;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--light-text);
    font-size: 0.9rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    background-color: rgba(10, 17, 40, 0.7);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-color);
    font-family: var(--body-font);
    backdrop-filter: blur(5px);
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 10px rgba(28, 181, 224, 0.3);
}

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

/* 页脚样式 */
.footer {
    background-color: var(--dark-color);
    padding: 60px 0 20px;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-brand h3 {
    font-size: 1.8rem;
    margin-bottom: 15px;
    background: linear-gradient(to right, var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.footer-brand p {
    color: var(--light-text);
    margin-bottom: 10px;
    font-size: 0.9rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 40px;
    flex: 1;
}

.footer-column h4 {
    color: var(--text-color);
    margin-bottom: 20px;
    font-size: 1.1rem;
    font-family: var(--heading-font);
}

.footer-column a {
    color: var(--light-text);
    display: block;
    margin-bottom: 12px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.footer-column a:hover {
    color: var(--secondary-color);
    transform: translateX(5px);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    color: var(--light-text);
    font-size: 0.9rem;
}

.social-icons {
    display: flex;
    gap: 15px;
}

.social-icons .icon {
    font-size: 1.2rem;
    color: var(--light-text);
    transition: all 0.3s ease;
}

.social-icons .icon:hover {
    color: var(--secondary-color);
    transform: translateY(-3px);
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
    100% {
        transform: translateY(0px);
    }
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero .container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-content {
        max-width: 100%;
        text-align: center;
        margin-bottom: 60px;
    }
    
    .subtitle {
        margin-left: auto;
        margin-right: auto;
    }
    
    .cta-buttons {
        justify-content: center;
    }
    
    .planet-container {
        width: 400px;
        height: 400px;
    }
    
    .about-content,
    .contact-content {
        flex-direction: column;
    }
    
    .tab-pane.active {
        flex-direction: column;
    }
    
    .tech-visual {
        min-height: 250px;
        margin-top: 30px;
    }
}

@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        gap: 20px;
    }
    
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .download-cards {
        flex-direction: column;
    }
    
    .download-card.highlighted {
        transform: none;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .tab-nav {
        flex-wrap: wrap;
    }
    
    .tab-link {
        min-width: 150px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .countdown-timer {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .cta-buttons {
        flex-direction: column;
        gap: 15px;
    }
    
    .planet-container {
        width: 300px;
        height: 300px;
    }
    
    .tab-link {
        min-width: 120px;
        padding: 10px 15px;
    }
    
    .tab-content {
        padding: 20px;
    }
}



/* 加入测试页面特定样式 */
.join-test-section {
    padding: 120px 0 80px;
    background: linear-gradient(to bottom, #0a1128 0%, #1a1a2e 100%);
}

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

.join-header h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    background: linear-gradient(to right, var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.join-header .subtitle {
    font-size: 1.2rem;
    color: var(--light-text);
    max-width: 600px;
    margin: 0 auto;
}

/* 加入流程 */
.join-process {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin: 60px auto;
    max-width: 1000px;
    flex-wrap: wrap;
}

.process-step {
    text-align: center;
    flex: 1;
    min-width: 180px;
    padding: 0 15px;
    margin-bottom: 30px;
}

.step-number {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    color: var(--dark-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    margin: 0 auto 20px;
    font-family: var(--heading-font);
}

.process-step h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: var(--secondary-color);
}

.process-step p {
    color: var(--light-text);
    font-size: 0.9rem;
}

.process-arrow {
    font-size: 2rem;
    color: var(--secondary-color);
    margin-top: 25px;
    opacity: 0.6;
}

/* 测试者权益 */
.test-benefits {
    margin: 80px 0;
}

.test-benefits h2 {
    text-align: center;
    margin-bottom: 50px;
    font-size: 2.2rem;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    max-width: 1100px;
    margin: 0 auto;
}

.benefit-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    padding: 30px;
    text-align: center;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
}

.benefit-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    border-color: var(--secondary-color);
}

.benefit-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
    display: inline-block;
}

.benefit-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--secondary-color);
}

.benefit-card p {
    color: var(--light-text);
    font-size: 0.95rem;
}

/* 申请表单 */
.join-form-container {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 50px;
    max-width: 1200px;
    margin: 0 auto;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 40px;
    backdrop-filter: blur(5px);
    box-shadow: var(--shadow);
}

.form-intro {
    padding-right: 20px;
}

.form-intro h2 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--secondary-color);
}

.form-intro p {
    color: var(--light-text);
    margin-bottom: 30px;
    line-height: 1.7;
}

.requirements {
    margin-top: 40px;
}

.requirements h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--text-color);
}

.requirements ul {
    list-style-type: none;
}

.requirements li {
    position: relative;
    padding-left: 25px;
    margin-bottom: 10px;
    color: var(--light-text);
}

.requirements li::before {
    content: "•";
    color: var(--secondary-color);
    font-size: 1.5rem;
    position: absolute;
    left: 0;
    top: -3px;
}

.join-form {
    display: flex;
    flex-direction: column;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-color);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 15px;
    background-color: rgba(10, 17, 40, 0.7);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-color);
    font-family: var(--body-font);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 2px rgba(28, 181, 224, 0.2);
}

.form-group textarea {
    min-height: 100px;
    resize: vertical;
}

.checkbox-group {
    display: flex;
    align-items: center;
}

.checkbox-group input {
    width: auto;
    margin-right: 10px;
}

.checkbox-group label {
    margin-bottom: 0;
    font-weight: normal;
}

.btn-submit {
    align-self: flex-start;
    padding: 15px 40px;
    font-size: 1rem;
    margin-top: 20px;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .join-form-container {
        grid-template-columns: 1fr;
    }
    
    .form-intro {
        padding-right: 0;
        padding-bottom: 30px;
        border-bottom: 1px solid var(--border-color);
        margin-bottom: 30px;
    }
    
    .join-process {
        flex-direction: column;
        align-items: center;
    }
    
    .process-step {
        margin-bottom: 40px;
    }
    
    .process-arrow {
        transform: rotate(90deg);
        margin: 10px 0;
    }
}

@media (max-width: 768px) {
    .join-header h1 {
        font-size: 2.5rem;
    }
    
    .join-header .subtitle {
        font-size: 1.1rem;
    }
    
    .test-benefits h2 {
        font-size: 2rem;
    }
    
    .join-form-container {
        padding: 30px 20px;
    }
}

@media (max-width: 480px) {
    .join-header h1 {
        font-size: 2rem;
    }
    
    .join-header .subtitle {
        font-size: 1rem;
    }
    
    .benefits-grid {
        grid-template-columns: 1fr;
    }
    
    .btn-submit {
        width: 100%;
    }
}

/* 登录页面特定样式 */
.login-page {
    min-height: 100vh;
    background: radial-gradient(ellipse at bottom, var(--dark-color) 0%, #000 100%);
    overflow: hidden;
    position: relative;
}

/* 星空背景动画 */
.stars, .stars2, .stars3 {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.stars {
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><circle cx="10" cy="10" r="0.5" fill="white"/><circle cx="30" cy="30" r="0.8" fill="white"/><circle cx="70" cy="70" r="0.3" fill="white"/><circle cx="90" cy="90" r="0.6" fill="white"/><circle cx="50" cy="20" r="0.4" fill="white"/><circle cx="20" cy="50" r="0.7" fill="white"/></svg>');
    animation: animStar 100s linear infinite;
}

.stars2 {
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="150" height="150" viewBox="0 0 150 150"><circle cx="15" cy="15" r="1" fill="white"/><circle cx="45" cy="45" r="0.8" fill="white"/><circle cx="105" cy="105" r="0.5" fill="white"/><circle cx="135" cy="135" r="0.7" fill="white"/><circle cx="75" cy="30" r="0.6" fill="white"/><circle cx="30" cy="75" r="0.9" fill="white"/></svg>');
    animation: animStar 150s linear infinite;
    opacity: 0.5;
}

.stars3 {
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200" viewBox="0 0 200 200"><circle cx="20" cy="20" r="1.2" fill="white"/><circle cx="60" cy="60" r="0.9" fill="white"/><circle cx="140" cy="140" r="0.7" fill="white"/><circle cx="180" cy="180" r="1.1" fill="white"/><circle cx="100" cy="40" r="0.8" fill="white"/><circle cx="40" cy="100" r="1" fill="white"/></svg>');
    animation: animStar 200s linear infinite;
    opacity: 0.3;
}

@keyframes animStar {
    from { transform: translateY(0) }
    to { transform: translateY(-1000px) }
}

/* 登录容器 */
.login-container {
    display: flex;
    align-items: center;
    min-height: calc(100vh - 80px);
    padding: 40px 0;
    position: relative;
    z-index: 2;
}

.login-container .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 60px;
}

.login-card {
    background-color: var(--card-bg);
    border-radius: 20px;
    padding: 40px;
    width: 100%;
    max-width: 500px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
}

.login-header {
    text-align: center;
    margin-bottom: 40px;
}

.login-header h2 {
    font-size: 2rem;
    color: var(--text-color);
    margin-bottom: 10px;
    background: linear-gradient(to right, var(--text-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.login-header p {
    color: var(--light-text);
    font-size: 0.95rem;
}

/* 登录表单 */
.login-form .form-group {
    margin-bottom: 25px;
    position: relative;
}

.login-form label {
    display: block;
    margin-bottom: 8px;
    color: var(--light-text);
    font-size: 0.9rem;
}

.login-form input {
    width: 100%;
    padding: 15px 45px 15px 15px;
    background-color: rgba(10, 17, 40, 0.7);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-color);
    font-family: var(--body-font);
    transition: all 0.3s ease;
}

.login-form input:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 10px rgba(28, 181, 224, 0.3);
}

.input-icon {
    position: absolute;
    right: 15px;
    top: 38px;
    transform: translateY(-50%);
    color: var(--light-text);
    pointer-events: none;
}

.toggle-password {
    position: absolute;
    right: 45px;
    top: 38px;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--light-text);
    cursor: pointer;
    padding: 5px;
}

.toggle-password:hover {
    color: var(--secondary-color);
}

/* 表单选项 */

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.remember-me {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--light-text);
    font-size: 0.9rem;
    cursor: pointer;
}

.remember-me input {
    width: auto;
    margin: 0;
}

.forgot-password {
    color: var(--light-text);
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.forgot-password:hover {
    color: var(--secondary-color);
}

.btn-block {
    display: block;
    width: 100%;
    padding: 15px;
    font-size: 1rem;
}

/* 分割线 */
.login-divider {
    display: flex;
    align-items: center;
    margin: 25px 0;
    color: var(--light-text);
    font-size: 0.9rem;
}

.login-divider::before,
.login-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background-color: var(--border-color);
    margin: 0 10px;
}

/* 社交登录 */
.social-login {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.btn-social {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 12px;
}

.social-icon {
    font-size: 1.2rem;
}

/* 登录页脚 */
.login-footer {
    text-align: center;
    margin-top: 30px;
    color: var(--light-text);
    font-size: 0.9rem;
}

.login-footer a {
    color: var(--secondary-color);
    font-weight: 500;
}

/* 登录信息卡片 */
.login-info {
    width: 100%;
    max-width: 400px;
}

.info-card {
    background-color: var(--card-bg);
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 30px;
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
}

.info-card h3 {
    font-size: 1.3rem;
    color: var(--text-color);
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.info-card h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 2px;
    background: linear-gradient(to right, var(--secondary-color), var(--accent-color));
}

.info-card ul {
    list-style: none;
}

.info-card li {
    color: var(--light-text);
    margin-bottom: 12px;
    position: relative;
    padding-left: 20px;
    line-height: 1.6;
}

.info-card li::before {
    content: '▹';
    color: var(--secondary-color);
    position: absolute;
    left: 0;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .login-container .container {
        flex-direction: column;
    }
    
    .login-info {
        max-width: 100%;
        display: flex;
        gap: 30px;
        margin-top: 50px;
    }
    
    .info-card {
        flex: 1;
        margin-bottom: 0;
    }
}

@media (max-width: 768px) {
    .login-card {
        padding: 30px;
    }
    
    .login-info {
        flex-direction: column;
        gap: 20px;
    }
}

@media (max-width: 480px) {
    .login-card {
        padding: 25px 20px;
    }
    
    .login-header h2 {
        font-size: 1.8rem;
    }
    
    .form-options {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .forgot-password {
        align-self: flex-end;
    }
}

/* 登录提示信息 */
.login-alert {
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 0.9rem;
    animation: fadeIn 0.3s ease;
    position: relative;
    padding-left: 40px;
}

.login-alert::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    background-size: contain;
    background-repeat: no-repeat;
}

.login-alert.success {
    background-color: rgba(40, 167, 69, 0.2);
    border: 1px solid rgba(40, 167, 69, 0.3);
    color: #28a745;
}

.login-alert.success::before {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%2328a745'%3E%3Cpath d='M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41L9 16.17z'/%3E%3C/svg%3E");
}

.login-alert.error {
    background-color: rgba(220, 53, 69, 0.2);
    border: 1px solid rgba(220, 53, 69, 0.3);
    color: #dc3545;
}

.login-alert.error::before {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23dc3545'%3E%3Cpath d='M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm1 15h-2v-2h2v2zm0-4h-2V7h2v6z'/%3E%3C/svg%3E");
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 加载动画 */
.spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: var(--text-color);
    animation: spin 1s ease-in-out infinite;
    vertical-align: middle;
    margin-right: 8px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 404页面样式 - 专业简约版 */
.error-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: #f8fafc;
}

.error-main {
    flex: 1;
    display: flex;
    align-items: center;
    padding: 4rem 0;
}

.error-card {
    background: white;
    border-radius: 12px;
    padding: 3rem;
    max-width: 600px;
    margin: 0 auto;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    border: 1px solid #e2e8f0;
    text-align: center;
}

.error-code {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 2rem;
    font-family: 'Orbitron', sans-serif;
}

.error-code span {
    font-size: 5rem;
    font-weight: 500;
    color: #0b3d91;
}

.error-icon {
    margin: 0 1.5rem;
}

.error-icon svg {
    width: 60px;
    height: 60px;
    fill: #64748b;
}

h1 {
    font-size: 1.75rem;
    color: #1e293b;
    margin-bottom: 1.25rem;
    font-weight: 500;
}

.error-description {
    color: #64748b;
    font-size: 1.1rem;
    line-height: 1.6;
    max-width: 80%;
    margin: 0 auto 2.5rem;
}

.error-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* 按钮微调 */
.btn {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .error-card {
        padding: 2rem;
    }
    
    .error-code span {
        font-size: 3.5rem;
    }
    
    .error-icon svg {
        width: 50px;
        height: 50px;
    }
    
    .error-description {
        max-width: 100%;
    }
    
    .error-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}