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

body {
    font-family: 'Microsoft YaHei', '微软雅黑', 'SimSun', '宋体', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    overflow-x: hidden;
}

.container {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.background-shapes {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
}

.shape-1, .shape-2, .shape-3 {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

.shape-1 {
    width: 200px;
    height: 200px;
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 150px;
    height: 150px;
    top: 70%;
    right: 10%;
    animation-delay: 2s;
}

.shape-3 {
    width: 100px;
    height: 100px;
    top: 50%;
    left: 80%;
    animation-delay: 4s;
}

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

.login-container {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 40px;
    width: 100%;
    max-width: 450px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.2);
    position: relative;
    z-index: 1;
}

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.logo {
    margin-bottom: 16px;
    display: flex;
    justify-content: center;
}

.login-header h1 {
    font-size: 28px;
    color: #2d3748;
    font-weight: 600;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.subtitle {
    color: #718096;
    font-size: 14px;
    font-weight: 400;
}

.login-form {
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #4a5568;
    font-weight: 500;
    font-size: 14px;
}

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

.input-wrapper input {
    width: 100%;
    padding: 16px 140px 16px 50px;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    font-size: 16px;
    color: #2d3748;
    background: #ffffff;
    transition: all 0.3s ease;
}

.input-wrapper input:focus {
    outline: none;
    border-color: #0062cc;
    box-shadow: 0 0 0 3px rgba(0, 98, 204, 0.1);
    transform: translateY(-1px);
}

.input-icon {
    position: absolute;
    left: 16px;
    font-size: 18px;
    color: #a0aec0;
    pointer-events: none;
}

.toggle-password {
    position: absolute;
    right: 16px;
    background: none;
    border: none;
    font-size: 16px;
    color: #a0aec0;
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: color 0.2s ease;
}

.toggle-password:hover {
    color: #0062cc;
}

.email-suffix {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: #a0aec0;
    font-size: 16px;
    pointer-events: none;
    background: #ffffff;
    padding-left: 8px;
}

.input-wrapper input[type="password"] {
    padding: 16px 50px 16px 50px;
}

.input-wrapper input:focus + .input-icon + .email-suffix {
    color: #0062cc;
}

.login-btn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #0062cc 0%, #0096ff 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    margin-bottom: 24px;
    overflow: hidden;
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 98, 204, 0.3);
}

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

.login-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.btn-text, .loading-spinner {
    transition: opacity 0.3s ease;
}

.loading-spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.login-footer {
    text-align: center;
    color: #a0aec0;
    font-size: 12px;
}

.alert {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    max-width: 400px;
    animation: slideIn 0.3s ease-out;
}

.alert-content {
    background: #fff;
    border-radius: 12px;
    padding: 16px 20px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    border-left: 4px solid #f56565;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.alert.success .alert-content {
    border-left-color: #48bb78;
}

.alert-message {
    color: #2d3748;
    font-size: 14px;
    font-weight: 500;
}

.alert-close {
    background: none;
    border: none;
    font-size: 18px;
    color: #a0aec0;
    cursor: pointer;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: color 0.2s ease;
}

.alert-close:hover {
    color: #4a5568;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* 响应式设计 */
@media (max-width: 480px) {
    .container {
        padding: 16px;
    }
    
    .login-container {
        padding: 24px;
    }
    
    .login-header h1 {
        font-size: 24px;
    }
    
    .alert {
        top: 16px;
        right: 16px;
        left: 16px;
        max-width: none;
    }
}