/* 登录页面样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.login-container {
    position: relative;
    z-index: 1;
    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),
        0 10px 20px rgba(0, 0, 0, 0.05);
    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 {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 8px;
}

.logo-icon {
    font-size: 32px;
    line-height: 1;
}

.logo h1 {
    font-size: 28px;
    font-weight: 700;
    color: #2d3748;
    margin: 0;
}

.subtitle {
    color: #718096;
    font-size: 14px;
    font-weight: 500;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    position: relative;
}

.form-group label {
    display: block;
    font-weight: 600;
    color: #4a5568;
    margin-bottom: 8px;
    font-size: 14px;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    padding-left: 45px;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    font-size: 16px;
    transition: all 0.3s ease;
    background: #f7fafc;
}

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

.input-icon {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 16px;
    color: #a0aec0;
    pointer-events: none;
}

.form-group:has(label) .input-icon {
    top: calc(50% + 12px);
}

.password-toggle {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    border-radius: 6px;
    transition: background-color 0.2s ease;
}

.form-group:has(label) .password-toggle {
    top: calc(50% + 12px);
}

.password-toggle:hover {
    background: rgba(0, 0, 0, 0.05);
}

.toggle-icon {
    font-size: 16px;
    color: #a0aec0;
}

.form-options {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: -5px 0 5px 0;
}

.remember-me {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: #4a5568;
    cursor: pointer;
    user-select: none;
}

.remember-me input {
    display: none;
}

.checkmark {
    width: 18px;
    height: 18px;
    border: 2px solid #e2e8f0;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.remember-me input:checked + .checkmark {
    background: #667eea;
    border-color: #667eea;
}

.remember-me input:checked + .checkmark::after {
    content: '✓';
    color: white;
    font-size: 12px;
    font-weight: bold;
}

.login-button {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.login-button:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
}

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

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

.button-text {
    transition: opacity 0.3s ease;
}

.loading-spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 16px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

.error-message {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: #fed7d7;
    border: 1px solid #feb2b2;
    border-radius: 8px;
    color: #c53030;
    font-size: 14px;
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.error-icon {
    font-size: 16px;
}

.login-footer {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #e2e8f0;
}

.login-footer p {
    color: #718096;
    font-size: 13px;
    margin: 2px 0;
}

.version {
    font-weight: 600;
}

/* 背景装饰 */
.background-pattern {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    opacity: 0.1;
    background-image: 
        radial-gradient(circle at 20% 50%, white 1px, transparent 1px),
        radial-gradient(circle at 80% 50%, white 1px, transparent 1px);
    background-size: 100px 100px;
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(1deg); }
}

/* 响应式设计 */
@media (max-width: 480px) {
    .login-container {
        padding: 15px;
    }
    
    .login-card {
        padding: 30px 25px;
        border-radius: 16px;
    }
    
    .logo h1 {
        font-size: 24px;
    }
    
    .form-group input {
        padding: 11px 14px;
        padding-left: 42px;
        font-size: 15px;
    }
    
    .login-button {
        padding: 13px;
        font-size: 15px;
    }
}

@media (max-height: 600px) {
    .login-card {
        padding: 25px 40px;
    }
    
    .login-header {
        margin-bottom: 20px;
    }
    
    .login-footer {
        margin-top: 20px;
        padding-top: 15px;
    }
}

/* 暗色主题支持 */
@media (prefers-color-scheme: dark) {
    .login-card {
        background: rgba(26, 32, 44, 0.95);
        border: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .logo h1 {
        color: #f7fafc;
    }
    
    .subtitle {
        color: #a0aec0;
    }
    
    .form-group label {
        color: #e2e8f0;
    }
    
    .form-group input {
        background: #2d3748;
        border-color: #4a5568;
        color: #f7fafc;
    }
    
    .form-group input:focus {
        background: #1a202c;
        border-color: #667eea;
    }
    
    .remember-me {
        color: #e2e8f0;
    }
    
    .login-footer p {
        color: #a0aec0;
    }
}