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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.login-box {
    background: rgba(255, 255, 255, 0.95);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

h2 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
    font-size: 28px;
    font-weight: 600;
}

.input-group {
    position: relative;
    margin-bottom: 25px;
}

.input-group input {
    width: 100%;
    padding: 15px 20px;
    border: 2px solid #e1e5e9;
    border-radius: 10px;
    font-size: 16px;
    background: transparent;
    transition: all 0.3s ease;
    outline: none;
}

.input-group label {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: #999;
    font-size: 16px;
    transition: all 0.3s ease;
    pointer-events: none;
}

.input-group input:focus,
.input-group input:valid {
    border-color: #667eea;
}

.input-group input:focus + label,
.input-group input:valid + label {
    top: 0;
    left: 15px;
    font-size: 12px;
    color: #667eea;
    background: white;
    padding: 0 5px;
}

.login-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 10px;
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
}

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

.error-message {
    background: #fee;
    color: #e74c3c;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    text-align: center;
    border: 1px solid #fcc;
    font-size: 14px;
}

.links {
    margin-top: 20px;
    text-align: center;
}

.links a {
    color: #667eea;
    text-decoration: none;
    margin: 0 10px;
    font-size: 14px;
    transition: color 0.3s ease;
}

.links a:hover {
    color: #764ba2;
    text-decoration: underline;
}

@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    .login-box {
        padding: 30px 20px;
    }
    
    h2 {
        font-size: 24px;
    }
}