/* login.css - 兼容性优化版本 */
body {
    font-family: Arial, sans-serif;
    background-image: url("../images/img/1678758744858-EWBrlDVf.jpg");
    background-size: contain; /* 保持原样，大部分现代浏览器支持 */
    background-position: center;
    margin: 0;
    padding: 0;
    background-color: #f0f2f5;
    display: -webkit-box; /* 旧版Safari, Chrome */
    display: -moz-box; /* 旧版Firefox */
    display: -ms-flexbox; /* IE10 */
    display: -webkit-flex; /* 旧版Safari, Chrome */
    display: flex; /* 标准语法 */
    -webkit-box-pack: center;
    -moz-box-pack: center;
    -ms-flex-pack: center;
    -webkit-justify-content: center;
    justify-content: center;
    -webkit-box-align: center;
    -moz-box-align: center;
    -ms-flex-align: center;
    -webkit-align-items: center;
    align-items: center;
    min-height: 100vh;
    height: 100%;
}

/* 添加一个半透明的遮罩层，让登录框更突出 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #000000; /* 为不支持rgba的浏览器提供降级方案 */
    background-color: rgba(0, 0, 0, 0.4);
    z-index: -1;
}

.login-container {
    background: #ffffff; /* 降级方案 */
    background: rgba(255, 255, 255, 0.95);
    padding: 2.5rem;
    border-radius: 12px;
    -webkit-box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    -moz-box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    width: 380px;
    text-align: center;
    position: relative;
    -webkit-animation: fadeIn 0.5s ease-out;
    -moz-animation: fadeIn 0.5s ease-out;
    -o-animation: fadeIn 0.5s ease-out;
    animation: fadeIn 0.5s ease-out;
}

@-webkit-keyframes fadeIn {
    from {
        opacity: 0;
        -webkit-transform: translateY(-20px);
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        -webkit-transform: translateY(0);
        transform: translateY(0);
    }
}

@-moz-keyframes fadeIn {
    from {
        opacity: 0;
        -moz-transform: translateY(-20px);
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        -moz-transform: translateY(0);
        transform: translateY(0);
    }
}

@-o-keyframes fadeIn {
    from {
        opacity: 0;
        -o-transform: translateY(-20px);
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        -o-transform: translateY(0);
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        -webkit-transform: translateY(-20px);
        -moz-transform: translateY(-20px);
        -ms-transform: translateY(-20px);
        -o-transform: translateY(-20px);
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        -webkit-transform: translateY(0);
        -moz-transform: translateY(0);
        -ms-transform: translateY(0);
        -o-transform: translateY(0);
        transform: translateY(0);
    }
}

h1 {
    margin-bottom: 2rem;
    font-size: 2.2rem;
    color: #2c3e50;
    font-family: "MyKaiti", Arial, sans-serif; /* 添加备用字体 */
    text-shadow: none;
    letter-spacing: 1px;
}

.input-group {
    display: -webkit-box;
    display: -moz-box;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
    -webkit-flex-direction: column;
    -moz-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    gap: 1.2rem;
    margin-bottom: 1.8rem;
}

.input-field {
    width: 100%;
}

input[type="text"],
input[type="password"] {
    width: 100%;
    padding: 1rem 1.2rem;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    background-color: #ffffff;
    box-sizing: border-box;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    -webkit-transition: all 0.3s ease;
    -moz-transition: all 0.3s ease;
    -o-transition: all 0.3s ease;
    transition: all 0.3s ease;
    -webkit-box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
    -moz-box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
}

input[type="text"]:focus,
input[type="password"]:focus {
    outline: none;
    border-color: #3498db;
    -webkit-box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2), inset 0 1px 3px rgba(0, 0, 0, 0.1);
    -moz-box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2), inset 0 1px 3px rgba(0, 0, 0, 0.1);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2), inset 0 1px 3px rgba(0, 0, 0, 0.1);
}

/* 占位符样式 */
input::-webkit-input-placeholder {
    color: #95a5a6;
    font-size: 0.95rem;
}

input::-moz-placeholder {
    color: #95a5a6;
    font-size: 0.95rem;
}

input:-ms-input-placeholder {
    color: #95a5a6;
    font-size: 0.95rem;
}

input:-moz-placeholder {
    color: #95a5a6;
    font-size: 0.95rem;
}

input::placeholder {
    color: #95a5a6;
    font-size: 0.95rem;
}

.submit-btn {
    width: 100%;
    padding: 1rem;
    /* 降级方案 - 不支持渐变的浏览器使用纯色 */
    background: #3498db;
    /* IE10+ */
    background: -ms-linear-gradient(135deg, #3498db, #2980b9);
    /* 旧版Chrome, Safari */
    background: -webkit-gradient(linear, left top, right bottom, from(#3498db), to(#2980b9));
    background: -webkit-linear-gradient(135deg, #3498db, #2980b9);
    /* 旧版Firefox */
    background: -moz-linear-gradient(135deg, #3498db, #2980b9);
    /* 标准语法 */
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    cursor: pointer;
    -webkit-transition: all 0.3s ease;
    -moz-transition: all 0.3s ease;
    -o-transition: all 0.3s ease;
    transition: all 0.3s ease;
    margin-top: 0.8rem;
    font-weight: 600;
    letter-spacing: 1px;
    -webkit-box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
    -moz-box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.submit-btn:hover {
    background: #2980b9;
    background: -webkit-linear-gradient(135deg, #2980b9, #1f6395);
    background: -moz-linear-gradient(135deg, #2980b9, #1f6395);
    background: -ms-linear-gradient(135deg, #2980b9, #1f6395);
    background: linear-gradient(135deg, #2980b9, #1f6395);
    -webkit-transform: translateY(-3px);
    -moz-transform: translateY(-3px);
    -ms-transform: translateY(-3px);
    -o-transform: translateY(-3px);
    transform: translateY(-3px);
    -webkit-box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
    -moz-box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

.submit-btn:active {
    -webkit-transform: translateY(-1px);
    -moz-transform: translateY(-1px);
    -ms-transform: translateY(-1px);
    -o-transform: translateY(-1px);
    transform: translateY(-1px);
    -webkit-box-shadow: 0 3px 15px rgba(52, 152, 219, 0.4);
    -moz-box-shadow: 0 3px 15px rgba(52, 152, 219, 0.4);
    box-shadow: 0 3px 15px rgba(52, 152, 219, 0.4);
}

.error-message {
    color: #e74c3c;
    background-color: rgba(231, 76, 60, 0.1);
    padding: 0.9rem;
    border-radius: 8px;
    font-size: 0.95rem;
    margin-top: 1.2rem;
    border-left: 4px solid #e74c3c;
    -webkit-animation: shake 0.5s ease-in-out;
    -moz-animation: shake 0.5s ease-in-out;
    -o-animation: shake 0.5s ease-in-out;
    animation: shake 0.5s ease-in-out;
}

@-webkit-keyframes shake {
    0%, 100% { -webkit-transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { -webkit-transform: translateX(-5px); }
    20%, 40%, 60%, 80% { -webkit-transform: translateX(5px); }
}

@-moz-keyframes shake {
    0%, 100% { -moz-transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { -moz-transform: translateX(-5px); }
    20%, 40%, 60%, 80% { -moz-transform: translateX(5px); }
}

@-o-keyframes shake {
    0%, 100% { -o-transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { -o-transform: translateX(-5px); }
    20%, 40%, 60%, 80% { -o-transform: translateX(5px); }
}

@keyframes shake {
    0%, 100% { 
        -webkit-transform: translateX(0);
        -moz-transform: translateX(0);
        -ms-transform: translateX(0);
        -o-transform: translateX(0);
        transform: translateX(0);
    }
    10%, 30%, 50%, 70%, 90% { 
        -webkit-transform: translateX(-5px);
        -moz-transform: translateX(-5px);
        -ms-transform: translateX(-5px);
        -o-transform: translateX(-5px);
        transform: translateX(-5px);
    }
    20%, 40%, 60%, 80% { 
        -webkit-transform: translateX(5px);
        -moz-transform: translateX(5px);
        -ms-transform: translateX(5px);
        -o-transform: translateX(5px);
        transform: translateX(5px);
    }
}

a {
    text-decoration: none;
    color: inherit;
}

a:hover h1 {
    color: #3498db;
    -webkit-transition: color 0.3s ease;
    -moz-transition: color 0.3s ease;
    -o-transition: color 0.3s ease;
    transition: color 0.3s ease;
}

/* 响应式设计 */
@media (max-width: 480px) {
    body {
        padding: 1rem;
    }
    
    .login-container {
        width: 100%;
        max-width: 340px;
        padding: 2rem;
        margin: auto;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    input[type="text"],
    input[type="password"] {
        padding: 0.9rem;
    }
    
    .submit-btn {
        padding: 0.9rem;
    }
}

/* 平板设备 */
@media (min-width: 481px) and (max-width: 768px) {
    .login-container {
        width: 420px;
        padding: 3rem;
    }
    
    h1 {
        font-size: 2.4rem;
    }
}

/* 大屏幕设备 */
@media (min-width: 1200px) {
    .login-container {
        width: 450px;
        padding: 3rem;
    }
    
    h1 {
        font-size: 2.5rem;
    }
    
    input[type="text"],
    input[type="password"] {
        padding: 1.1rem;
        font-size: 1.05rem;
    }
    
    .submit-btn {
        padding: 1.1rem;
        font-size: 1.15rem;
    }
}

/* 针对IE9及以下版本的特定修复 */
.lt-ie9 .login-container {
    background: #ffffff; /* 移除rgba透明度 */
    border: 1px solid #ddd;
}

.lt-ie9 .submit-btn {
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#3498db', endColorstr='#2980b9'); /* IE渐变 */
}

.lt-ie9 body::before {
    display: none; /* IE8及以下不支持伪元素 */
}