/* 彻底重置所有样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    width: 100%;
    overflow-x: hidden; /* 改为允许垂直滚动 */
    overflow-y: auto;   /* 允许垂直滚动 */
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh; /* 确保最小高度 */
}

/* 终极居中容器 - 修复滚动问题 */
.center-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    width: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative; /* 改为相对定位 */
    padding: 20px 0; /* 添加上下内边距 */
    overflow-y: auto; /* 允许垂直滚动 */
}

/* 主内容卡片 - 修复高度问题 */
.main-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 40px 60px; /* 减小内边距 */
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    text-align: center;
    max-width: 500px;
    width: 90%;
    border: 1px solid rgba(255, 255, 255, 0.2);
    margin: 20px auto; /* 改为自动外边距 */
    position: relative;
    z-index: 1;
}

/* 响应式设计调整 */
@media (max-height: 800px) {
    .main-card {
        padding: 30px 40px; /* 在小屏幕上减小内边距 */
        margin: 10px auto;
    }
    
    .logo {
        width: 100px;
        height: 100px;
    }
    
    .logo-icon {
        font-size: 50px;
    }
    
    .main-title {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .btn-large {
        padding: 15px 30px;
        font-size: 1.1rem;
        min-width: 200px;
    }
}

@media (max-height: 600px) {
    .main-card {
        padding: 20px 30px;
    }
    
    .logo-section {
        margin-bottom: 20px;
    }
    
    .logo {
        width: 80px;
        height: 80px;
    }
    
    .logo-icon {
        font-size: 40px;
    }
    
    .main-title {
        font-size: 1.8rem;
        margin-bottom: 5px;
    }
    
    .subtitle {
        font-size: 0.9rem;
        margin-bottom: 20px;
    }
}

/* Logo区域 */
.logo-section {
    margin-bottom: 30px; /* 减小间距 */
}

.logo {
    width: 100px; /* 减小尺寸 */
    height: 100px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 15px;
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

.logo-icon {
    font-size: 50px;
    color: white;
}

.main-title {
    font-size: 2.2rem;
    color: #2c3e50;
    margin-bottom: 8px;
    font-weight: 700;
}

.subtitle {
    font-size: 1.1rem;
    color: #7f8c8d;
    margin-bottom: 30px;
}

/* 表单容器样式优化 */
.form-container {
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 20px; /* 减小间距 */
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    color: #2c3e50;
    font-size: 0.9rem;
}

.form-input {
    width: 100%;
    padding: 12px 15px; /* 减小内边距 */
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 14px;
    transition: border-color 0.3s ease;
}

.btn-large {
    padding: 15px 35px; /* 减小按钮尺寸 */
    font-size: 1.1rem;
    border: none;
    border-radius: 50px;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    font-weight: 600;
    min-width: 220px;
    display: inline-block;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: linear-gradient(135deg, #f093fb, #f5576c);
    color: white;
    box-shadow: 0 8px 25px rgba(240, 147, 251, 0.3);
}

.btn-secondary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(240, 147, 251, 0.4);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .main-card {
        padding: 40px 30px;
        margin: 20px;
    }
    
    .main-title {
        font-size: 2rem;
    }
    
    .btn-large {
        font-size: 1.1rem;
        padding: 18px 35px;
        min-width: 200px;
    }
}

@media (max-width: 480px) {
    .main-card {
        padding: 30px 20px;
    }
    
    .main-title {
        font-size: 1.8rem;
    }
    
    .logo {
        width: 100px;
        height: 100px;
    }
    
    .logo-icon {
        font-size: 50px;
    }
}

/* 表单样式 */
.form-container {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    max-width: 400px;
    width: 90%;
    margin: 20px auto;
}

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

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #2c3e50;
    font-size: 1.1rem;
}

.form-input {
    width: 100%;
    padding: 15px 20px;
    border: 2px solid #e0e0e0;
    border-radius: 50px;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.8);
}

.form-input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-button {
    width: 100%;
    padding: 18px;
    font-size: 1.2rem;
    margin-top: 20px;
}

.alert {
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-weight: 500;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* 在文件末尾添加以下样式 */

/* 按钮容器样式 */
.button-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px; /* 增大按钮之间的间距 */
    margin: 30px 0; /* 添加上下边距 */
}

/* 响应式调整 */
@media (max-width: 480px) {
    .button-container {
        gap: 25px; /* 在小屏幕上稍微减小间距 */
        margin: 25px 0;
    }
}

@media (max-height: 600px) {
    .button-container {
        gap: 20px; /* 在小高度屏幕上减小间距 */
        margin: 20px 0;
    }
}