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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #4a90e2 0%, #357abd 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.container {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.login-card {
    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);
    border: 1px solid rgba(255, 255, 255, 0.2);
    animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.logo {
    width: 80px;
    height: 80px;
    background: linear-gradient(110deg, #4a90e2, #357abd);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    box-shadow: 0 10px 10px rgba(74, 144, 226, 0.3);
}

.logo i {
    font-size: 40px;
    color: white;
}

.login-header h1 {
    color: #333;
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 8px;
}

.login-header p {
    color: #666;
    font-size: 16px;
}

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

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 15px;
    color: #999;
    font-size: 18px;
    z-index: 2;
}

.input-wrapper input {
    width: 100%;
    padding: 15px 15px 15px 50px;
    border: 2px solid #e1e5e9;
    border-radius: 12px;
    font-size: 16px;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.8);
}

/* 输入框焦点效果 */
.input-wrapper input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    background: white;
}

.input-wrapper input::placeholder {
    color: #999;
}

.password-toggle {
    position: absolute;
    right: 15px;
    background: none;
    border: none;
    color: #999;
    cursor: pointer;
    font-size: 18px;
    transition: color 0.3s ease;
}

.password-toggle:hover {
    color: #667eea;
}

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

/* 复选框样式 */
.checkbox-wrapper {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 14px;
    color: #666;
}

.checkbox-wrapper input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 18px;
    height: 18px;
    border: 2px solid #ddd;
    border-radius: 4px;
    margin-right: 8px;
    position: relative;
    transition: all 0.3s ease;
}

.checkbox-wrapper input[type="checkbox"]:checked+.checkmark {
    background: #667eea;
    border-color: #667eea;
}

.checkbox-wrapper input[type="checkbox"]:checked+.checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 12px;
    font-weight: bold;
}

.forgot-password {
    color: #4a90e2;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
}

.forgot-password:hover {
    color: #357abd;
}

.login-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #4a90e2, #357abd);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 25px;
}

/* 按钮悬停效果 */
.login-btn:hover {
    background: linear-gradient(135deg, #357abd, #4a90e2);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(74, 144, 226, 0.3);
}

.login-btn:active {
    transform: translateY(0);
}

/* 分割线 */
.divider {
    position: relative;
    text-align: center;
    margin: 30px 0;
}

.divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, #ddd, transparent);
}

.divider span {
    background: white;
    padding: 0 15px;
    color: #999;
    font-size: 14px;
}

/* 社交登录按钮 */
.social-login {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
}

.social-btn {
    flex: 1;
    padding: 12px;
    border: 2px solid #e1e5e9;
    border-radius: 12px;
    background: white;
    color: #666;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.social-btn:hover {
    border-color: #667eea;
    color: #667eea;
    transform: translateY(-1px);
}

.social-btn.google:hover {
    border-color: #db4437;
    color: #db4437;
}

.social-btn.facebook:hover {
    border-color: #4267b2;
    color: #4267b2;
}

.social-btn i {
    font-size: 18px;
}

/* 注册链接 */
.signup-link {
    text-align: center;
    margin-top: 20px;
}

.signup-link a {
    color: #4a90e2;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.signup-link a:hover {
    color: #357abd;
}

/* 背景装饰 */
.background-decoration {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    overflow: hidden;
}

.circle {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    animation: float 6s ease-in-out infinite;
}

.circle-1 {
    width: 100px;
    height: 100px;
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.circle-2 {
    width: 150px;
    height: 150px;
    top: 60%;
    right: 15%;
    animation-delay: 2s;
}

.circle-3 {
    width: 80px;
    height: 80px;
    bottom: 20%;
    left: 20%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px) rotate(0deg);
    }
    50% {
        transform: translateY(-20px) rotate(180deg);
    }
}

/* 响应式设计 */
@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    .login-card {
        padding: 30px 20px;
    }
    
    .login-header h1 {
        font-size: 24px;
    }
    
    .social-login {
        flex-direction: column;
    }
    
    .form-options {
        flex-direction: column;
        gap: 10px;
        align-items: flex-start;
    }
}

/* 加载状态 */
.loading {
    pointer-events: none;
}

.loading .login-btn {
    position: relative;
    overflow: hidden;
}

.loading .login-btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid transparent;
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}