:root {
    --primary-color: #ff6b81;
    --secondary-color: #8e44ad;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --success-color: #2ecc71;
    --error-color: #e74c3c;
    --transition-duration: 0.3s;
    --focus-shadow: 0 0 0 3px rgba(255, 107, 129, 0.25);
}

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

body {
    font-family: 'Arial', 'Microsoft Yahei', sans-serif;
    background: #f5f7fa url('https://api.yimian.xyz/img?type=moe') no-repeat center center fixed;
    background-size: cover;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    z-index: -1;
    will-change: opacity;
}

.login-container {
    width: 100%;
    max-width: 1200px;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    perspective: 1000px;
    padding: 20px;
}

.login-box {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1),
                0 5px 15px rgba(0, 0, 0, 0.05);
    padding: 40px;
    width: 450px;
    z-index: 10;
    animation: fadeIn 0.8s ease-in-out;
    transform-style: preserve-3d;
    backface-visibility: hidden;
    will-change: transform, opacity;
    transition: transform var(--transition-duration), box-shadow var(--transition-duration);
}

.login-box:hover {
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15),
                0 10px 20px rgba(0, 0, 0, 0.1);
    transform: translateY(-5px);
}

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

.login-header h1 {
    color: var(--secondary-color);
    font-size: 28px;
    margin-bottom: 10px;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
    letter-spacing: 0.5px;
}

.login-header p {
    color: var(--dark-color);
    opacity: 0.7;
    font-size: 16px;
    line-height: 1.5;
}

.login-error {
    padding: 10px 15px;
    border-radius: 4px;
    background-color: rgba(231, 76, 60, 0.1);
    border-left: 3px solid var(--error-color);
    color: var(--error-color);
    font-size: 14px;
    margin-bottom: 20px;
    animation: shake 0.5s ease-in-out;
    transition: all var(--transition-duration);
}

.login-message {
    padding: 10px 15px;
    border-radius: 4px;
    background-color: rgba(52, 152, 219, 0.1);
    border-left: 3px solid #3498db;
    color: #2980b9;
    font-size: 14px;
    margin-bottom: 20px;
    animation: fadeIn 0.5s ease-in-out;
    transition: all var(--transition-duration);
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--dark-color);
    font-size: 14px;
    font-weight: 600;
    transition: all var(--transition-duration) ease;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e1e1e1;
    border-radius: 8px;
    font-size: 15px;
    transition: all var(--transition-duration);
    background-color: white;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: var(--focus-shadow);
    background-color: white;
}

.form-group button {
    width: 100%;
    padding: 14px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-duration);
    position: relative;
    overflow: hidden;
}

.form-group button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: all 0.5s;
}

.form-group button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.form-group button:hover::before {
    left: 100%;
}

.form-group button:active {
    transform: translateY(1px);
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
}

.remember-group {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    user-select: none;
}

.remember-group input[type="checkbox"] {
    width: auto;
    margin-right: 8px;
    cursor: pointer;
}

.remember-group label {
    margin-bottom: 0;
    font-weight: normal;
    cursor: pointer;
    font-size: 14px;
}

.anime-character {
    position: absolute;
    right: 0;
    bottom: -80px;
    width: 500px;
    height: 600px;
    background-image: url('../img/anime-character.png');
    background-size: contain;
    background-repeat: no-repeat;
    background-position: bottom right;
    z-index: 1;
    animation: float 6s ease-in-out infinite;
    opacity: 0;
    transition: opacity 0.8s ease;
}

@media (hover: none) and (pointer: coarse) {
    .form-group input, .form-group button {
        min-height: 48px;
    }
    
    .login-box {
        padding: 30px;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

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

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

.form-error {
    color: var(--error-color);
    font-size: 12px;
    margin-top: 5px;
    animation: fadeIn 0.3s ease;
}

input.is-invalid {
    border-color: var(--error-color);
    background-color: rgba(231, 76, 60, 0.05);
}

@media (max-width: 992px) {
    .anime-character {
        width: 400px;
        opacity: 0.3;
        right: -100px;
    }
    
    .login-box {
        width: 400px;
    }
}

@media (max-width: 768px) {
    .login-box {
        width: 90%;
        max-width: 400px;
        padding: 30px;
    }
    
    .anime-character {
        display: none;
    }
    
    .login-header h1 {
        font-size: 24px;
    }
    
    .login-header p {
        font-size: 14px;
    }
    
    .form-group input {
        padding: 12px;
    }
    
    .form-group button {
        padding: 12px;
    }
}

@media (max-width: 480px) {
    .login-box {
        padding: 25px;
        border-radius: 12px;
    }
    
    .login-header {
        margin-bottom: 20px;
    }
    
    .login-header h1 {
        font-size: 22px;
    }
    
    .form-group {
        margin-bottom: 20px;
    }
    
    .form-group input {
        font-size: 14px;
    }
    
    .form-group button {
        font-size: 15px;
    }
}