body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    max-width: 400px;
    width: 90%;
    background: rgba(255, 255, 255, 0.95);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.2);
    backdrop-filter: blur(10px);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.container:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.25);
}

.logo {
    text-align: center;
    margin-bottom: 30px;
    animation: fadeIn 1s ease;
}

.logo i {
    font-size: 48px;
    color: #764ba2;
    margin-bottom: 15px;
}

h2 {
    color: #2c3e50;
    text-align: center;
    margin-bottom: 30px;
    font-weight: 700;
    font-size: 24px;
    animation: slideDown 0.5s ease;
}

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

.input-group {
    position: relative;
    animation: slideUp 0.5s ease;
}

.input-group i {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: #764ba2;
    font-size: 18px;
}

input {
    width: 100%;
    padding: 12px 12px 12px 40px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 16px;
    box-sizing: border-box;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.9);
}

input:focus {
    border-color: #764ba2;
    box-shadow: 0 0 10px rgba(118, 75, 162, 0.2);
    outline: none;
}

button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 14px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(118, 75, 162, 0.3);
}

button:active {
    transform: translateY(0);
}

button::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

button:active::after {
    width: 200px;
    height: 200px;
    opacity: 0;
}

.error-message {
    color: #e74c3c;
    margin-top: 15px;
    text-align: center;
    font-weight: bold;
    padding: 10px;
    border-radius: 5px;
    background: rgba(231, 76, 60, 0.1);
    animation: shake 0.5s ease;
}

.copyright {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.9);
    padding: 10px 0;
    text-align: center;
    font-size: 14px;
    color: #2c3e50;
    backdrop-filter: blur(5px);
    border-top: 1px solid rgba(0,0,0,0.1);
}

.copyright a {
    color: #764ba2;
    text-decoration: none;
    transition: color 0.3s ease;
}

.copyright a:hover {
    color: #667eea;
}

.copyright img {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    vertical-align: middle;
    margin-right: 5px;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

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

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

@media (max-width: 768px) {
    .container {
        width: 85%;
        padding: 30px;
    }
    .logo i {
        font-size: 40px;
    }
    h2 {
        font-size: 22px;
    }
    input {
        padding: 10px 10px 10px 35px;
        font-size: 15px;
    }
    .input-group i {
        font-size: 16px;
    }
    button {
        padding: 12px;
        font-size: 15px;
    }
}

@media (max-width: 480px) {
    .container {
        width: 90%;
        padding: 25px;
    }
    .logo i {
        font-size: 36px;
    }
    h2 {
        font-size: 20px;
        margin-bottom: 25px;
    }
    form {
        gap: 15px;
    }
    input {
        padding: 10px 10px 10px 32px;
        font-size: 14px;
    }
    .input-group i {
        font-size: 15px;
        left: 10px;
    }
    button {
        padding: 10px;
        font-size: 14px;
    }
    .error-message {
        font-size: 14px;
        padding: 8px;
        margin-top: 12px;
    }
}