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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(120, 119, 198, 0.3), transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(252, 103, 250, 0.3), transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(96, 165, 250, 0.3), transparent 50%);
    z-index: -1;
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

/* 顶部通栏区域 */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 20px 0;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: white;
    padding: 5px;
}

.site-name {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 32px;
    font-weight: 700;
    letter-spacing: 1px;
}

/* 中间内容区域 */
.main-content {
    flex: 1;
    max-width: 1200px;
    margin: 60px auto;
    padding: 0 20px;
    width: 100%;
    display: flex;
    align-items: center;
    gap: 80px;
}

.intro-section {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.intro-text {
    font-size: 36px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 2;
    font-weight: 600;
    text-align: center;
    padding: 50px;
    background-color: rgba(255, 255, 255, 0.9);
    background-image: none;
    color: #667eea;
    border-radius: 24px;
    box-shadow: 0 8px 32px rgba(31, 38, 135, 0.15);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.intro-text:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(31, 38, 135, 0.25);
}

.login-section {
    display: flex;
    flex-direction: column;
    gap: 30px;
    min-width: 300px;
}

.login-btn {
    padding: 20px 60px;
    font-size: 20px;
    font-weight: 600;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.student-login {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.student-login::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s;
}

.student-login:hover::before {
    left: 100%;
}

.student-login:hover {
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(102, 126, 234, 0.5);
}

.org-login {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.org-login::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s;
}

.org-login:hover::before {
    left: 100%;
}

.org-login:hover {
    background: linear-gradient(135deg, #f5576c 0%, #f093fb 100%);
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(240, 147, 251, 0.5);
}

/* 软件下载区域 */
.download-section {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    padding: 60px 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.3);
}

.download-content {
    max-width: 1200px;
    margin: 0 auto;
}

.download-title {
    text-align: center;
    font-size: 32px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 30px;
    font-weight: 700;
}

.download-instructions {
    text-align: center;
    margin-bottom: 40px;
}

.download-instructions p {
    font-size: 16px;
    color: #555;
    margin: 10px 0;
    line-height: 1.6;
}

.download-instructions .secondary {
    font-size: 14px;
    color: #888;
}

.download-platforms {
    display: flex;
    justify-content: center;
    gap: 60px;
    flex-wrap: wrap;
}

.platform-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.platform-item:hover {
    transform: translateY(-5px);
}

.platform-icon {
    width: 100px;
    height: 100px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 32px rgba(31, 38, 135, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.5);
    transition: all 0.3s ease;
    overflow: hidden;
}

.platform-icon img {
    width: 60px;
    height: 60px;
    object-fit: contain;
    transition: transform 0.3s ease;
}

.platform-item:hover .platform-icon {
    box-shadow: 0 12px 40px rgba(102, 126, 234, 0.3);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
}

.platform-item:hover .platform-icon img {
    transform: scale(1.1);
}

.platform-name {
    font-size: 18px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 600;
}

/* 底部版权区域 */
.footer {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    color: #667eea;
    padding: 30px 20px;
    text-align: center;
    margin-top: auto;
    border-top: 1px solid rgba(255, 255, 255, 0.3);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer p {
    margin: 8px 0;
    font-size: 14px;
    opacity: 0.8;
    color: #764ba2;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .main-content {
        flex-direction: column;
        gap: 40px;
        margin: 30px auto;
    }

    .intro-text {
        font-size: 24px;
        padding: 30px 20px;
    }

    .login-section {
        width: 100%;
        max-width: 300px;
    }

    .download-platforms {
        gap: 40px;
    }

    .site-name {
        font-size: 22px;
    }
}