body {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding-bottom: 50px; /* 为底部备案信息预留空间 */
}

.container {
    background-color: white;
    padding: 40px 50px;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
    max-width: 400px;
    width: 90%;
}

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

h2 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
    font-size: 28px;
    font-weight: 600;
}

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

label {
    display: block;
    margin-bottom: 8px;
    color: #555;
    font-size: 14px;
    font-weight: 500;
}

input {
    width: 100%;
    padding: 12px;
    border: 2px solid #eee;
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s ease;
    outline: none;
    box-sizing: border-box;
}

input:focus {
    border-color: #4CAF50;
    box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}

button {
    width: 100%;
    background: linear-gradient(45deg, #4CAF50, #45a049);
    color: white;
    padding: 14px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

button:hover {
    background: linear-gradient(45deg, #45a049, #3d8b40);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(76, 175, 80, 0.2);
}

button:active {
    transform: translateY(0);
}

button:disabled {
    background: linear-gradient(45deg, #cccccc, #bbbbbb);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.loading {
    display: none;
    text-align: center;
    margin-top: 15px;
    font-size: 16px;
    color: #4CAF50;
    animation: loadingAnimation 1s infinite;
}

@keyframes loadingAnimation {
    0% {
        opacity: 0.2;
    }
    50% {
        opacity: 1;
    }
    100% {
        opacity: 0.2;
    }
}

.error-message {
    display: none;
    color: #ff5252;
    text-align: center;
    margin-top: 10px;
    padding: 10px;
    border-radius: 6px;
    background-color: rgba(255, 82, 82, 0.1);
    font-size: 14px;
}

.links {
    text-align: center;
    margin-top: 25px;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

.links a {
    color: #4CAF50;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.links a:hover {
    color: #45a049;
    text-decoration: none;
}

.password-requirements {
    font-size: 13px;
    color: #666;
    margin-top: 8px;
    padding-left: 5px;
}

.success-message {
    display: none;
    color: #4CAF50;
    text-align: center;
    margin-top: 10px;
    padding: 10px;
    border-radius: 6px;
    background-color: rgba(76, 175, 80, 0.1);
    font-size: 14px;
}

.email-group {
    display: flex;
    gap: 10px;
}

.send-code-btn {
    width: auto;
    padding: 12px 20px;
    white-space: nowrap;
    background-color: #2196F3;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s;
}

.send-code-btn:hover {
    background-color: #1976D2;
}

.send-code-btn:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

@media (max-width: 480px) {
    .container {
        padding: 30px 25px;
        margin-bottom: 60px; /* 为底部备案信息预留空间 */
    }
    h2 {
        font-size: 24px;
    }
    button {
        padding: 12px;
    }
    body {
        padding-bottom: 70px; /* 在移动设备上增加更多底部间距 */
        min-height: 100vh;
        height: auto; /* 允许内容超出视口高度 */
    }
}

/* 底部备案信息样式 */
.site-footer {
    width: 100%;
    text-align: center;
    padding: 16px 8px 20px 8px;
    background: transparent;
    color: #666;
    font-size: 15px;
    font-family: 'Microsoft YaHei', 'Segoe UI', Arial, sans-serif;
    box-sizing: border-box;
    line-height: 1.6;
    margin-top: 40px;
    word-break: break-all;
    position: fixed;
    bottom: 0;
    left: 0; /* 确保左对齐 */
    z-index: 1000; /* 确保在其他元素之上 */
}

.site-footer a {
    color: #666;
    text-decoration: none;
    margin-left: 12px;
    transition: color 0.3s, transform 0.3s;
    font-size: 15px;
}

.site-footer a:hover {
    color: #1890ff;
    transform: scale(1.05);
}

@media (max-width: 600px) {
    .site-footer {
        font-size: 13px;
        padding: 12px 4px 16px 4px;
        position: fixed; /* 确保在移动设备上也是固定的 */
        bottom: 0;
    }
    .site-footer a {
        font-size: 13px;
        margin-left: 0;
        display: inline-block; /* 改为行内块，让版权信息和备案号在同一行 */
        margin-top: 0;
        padding: 0 5px;
    }
    
    .container {
        margin-bottom: 60px; /* 确保内容不被底部footer遮挡 */
        padding-bottom: 20px;
    }
}

@media (max-width: 360px) {
    .site-footer span, .site-footer a {
        display: block;
        text-align: center;
        margin: 5px auto;
    }
}