/* 登录页面特有样式 */
/* 登录容器 */
.login-container {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: var(--bg-gradient);
    padding: var(--spacing-lg);
    z-index: 5;
}

/* 登录框 */
.login-box {
    padding: 24px;
    width: 100%;
    max-width: 340px;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 12px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    z-index: 10;
    animation: fadeInUp 1s ease-out;
}

/* 输入框占位符样式 */
::placeholder {
    color: rgba(0, 0, 0, 0.4);
    font-size: 0.9rem;
}

/* 表单样式优化 */
.form-group {
    margin-bottom: 18px;
    position: relative;
    animation: fadeInUp 0.8s ease-out forwards;
    opacity: 0;
}

.form-group:nth-child(1) {
    animation-delay: 0.5s;
}

.form-group:nth-child(2) {
    animation-delay: 0.6s;
}

.login-button {
    animation: fadeInUp 0.8s ease-out forwards;
    opacity: 0;
    animation-delay: 0.7s;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    color: rgba(0, 0, 0, 0.8);
    transition: all 0.3s ease;
}

.form-group label i {
    margin-right: var(--spacing-xs);
    color: rgba(0, 0, 0, 0.6);
}

.form-group input {
    width: 100%;
    padding: 12px 14px;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(0, 0, 0, 0.2);
    border-radius: 8px;
    color: rgba(0, 0, 0, 0.9);
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.form-group input:hover {
    border-color: rgba(0, 0, 0, 0.3);
    background: rgba(255, 255, 255, 1);
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent-primary);
    background: rgba(255, 255, 255, 1);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
    transform: translateY(-1px);
}

/* 登录头部优化 */
.login-header {
    text-align: center;
    margin-bottom: 24px;
    padding: 8px 0;
}

.login-header .logo {
    font-size: 2rem;
    font-weight: 900;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
    animation: logoPulse 2s ease-in-out infinite alternate;
    display: inline-block;
}

@keyframes logoPulse {
    from { transform: scale(1); filter: brightness(1); }
    to { transform: scale(1.05); filter: brightness(1.1); }
}

.login-header h2 {
    font-size: 1.3rem;
    font-weight: 700;
    color: rgba(0, 0, 0, 0.9);
    margin-bottom: 6px;
    letter-spacing: 0.2px;
}

.login-header p {
    color: rgba(0, 0, 0, 0.6);
    font-size: 0.85rem;
    margin: 0;
    line-height: 1.4;
}

/* 错误消息 */
.error-message {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.4);
    border-radius: 8px;
    padding: calc(var(--spacing-sm) - 2px);
    margin-bottom: calc(var(--spacing-md) - 2px);
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-xs) - 1px);
    color: #dc2626;
    font-size: 0.85rem;
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-4px); }
    75% { transform: translateX(4px); }
}

.error-message i {
    font-size: 1rem;
}

/* 输入提示样式 */
.input-hint {
    font-size: 0.78rem;
    color: rgba(0, 0, 0, 0.5);
    margin-top: 4px;
    display: block;
    transition: all 0.3s ease;
    font-weight: 500;
}

.input-hint.valid {
    color: var(--accent-primary);
}

.input-hint.invalid {
    color: #dc2626;
    font-weight: 600;
    animation: shake 0.5s ease-in-out;
}

/* 表单组错误状态 */
.form-group.error input {
    border-color: #dc2626;
    box-shadow: 0 0 0 2px rgba(239, 68, 68, 0.25);
}

.form-group.error label {
    color: #dc2626;
}

/* 登录按钮优化 */
.login-button {
    width: 100%;
    padding: 12px 20px;
    background: var(--accent-gradient);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    margin-top: 8px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    letter-spacing: 0.2px;
    text-transform: none;
}

.login-button:hover {
    opacity: 0.95;
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.login-button:active {
    opacity: 0.9;
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

.login-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    background: rgba(0, 0, 0, 0.1);
    color: rgba(0, 0, 0, 0.4);
}

/* 加载动画 */
.loading-spinner {
    display: none;
    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); }
}

/* 登录页面响应式设计 */
@media (max-width: 768px) {
    .login-container {
        padding: var(--spacing-md);
        padding-top: var(--spacing-lg);
    }
    
    .login-box {
        padding: 22px;
        max-width: 100%;
        margin: 0 auto;
        background: rgba(255, 255, 255, 0.95);
    }
}

@media (max-width: 480px) {
    .login-container {
        padding: calc(var(--spacing-sm) + 8px);
        padding-top: var(--spacing-md);
    }
    
    .login-box {
        padding: 20px;
        background: rgba(255, 255, 255, 0.95);
    }
    
    /* 登录头部响应式 */
    .login-header .logo {
        font-size: 1.8rem;
        margin-bottom: 6px;
    }
    
    .login-header h2 {
        font-size: 1.2rem;
    }
    
    .login-header p {
        font-size: 0.82rem;
    }
    
    /* 表单元素响应式 */
    .form-group {
        margin-bottom: 16px;
    }
    
    .form-group label {
        font-size: 0.82rem;
    }
    
    .form-group input {
        padding: 11px 13px;
        font-size: 0.85rem;
    }
    
    /* 按钮响应式 */
    .login-button {
        padding: 11px 18px;
        font-size: 0.9rem;
        margin-top: 7px;
    }
    
    /* 错误消息响应式 */
    .error-message {
        padding: calc(var(--spacing-sm) - 3px);
        margin-bottom: calc(var(--spacing-md) - 3px);
        font-size: 0.82rem;
        gap: calc(var(--spacing-xs) - 2px);
    }
    
    .error-message i {
        font-size: 0.95rem;
    }
    
    /* 加载动画响应式 */
    .loading-spinner {
        width: 18px;
        height: 18px;
        border-width: 2px;
    }
}

@media (max-width: 360px) {
    .login-container {
        padding: calc(var(--spacing-sm) + 10px);
        padding-top: var(--spacing-md);
    }
    
    .login-box {
        padding: 18px 16px;
    }
    
    .login-header .logo {
        font-size: 1.6rem;
    }
    
    .login-header h2 {
        font-size: 1.15rem;
    }
    
    .form-group input {
        padding: 10px 12px;
        font-size: 0.82rem;
    }
    
    .login-button {
        padding: 10px 16px;
        font-size: 0.88rem;
    }
}