* {
margin: 0;
padding: 0;
box-sizing: border-box;
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
min-height: 100vh;
background-image: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('/api/placeholder/1920/1080');
background-size: cover;
background-position: center;
background-attachment: fixed;
display: flex;
justify-content: center;
align-items: center;
padding: 20px;
}

.container {
background: rgba(255, 255, 255, 0.95);
padding: 2.5rem;
border-radius: 20px;
box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
width: 100%;
max-width: 450px;
backdrop-filter: blur(10px);
}

.brand {
text-align: center;
margin-bottom: 2rem;
}

.brand h1 {
color: #2c3e50;
font-size: 2rem;
margin-bottom: 0.5rem;
}

.brand p {
color: #7f8c8d;
font-size: 1rem;
}

.tabs {
display: flex;
margin-bottom: 2rem;
background: #f8f9fa;
border-radius: 10px;
padding: 0.3rem;
}

.tab {
flex: 1;
padding: 1rem;
text-align: center;
cursor: pointer;
border-radius: 8px;
transition: all 0.3s ease;
font-weight: 500;
color: #666;
}

.tab.active {
background: #3498db;
color: white;
}

.form-group {
margin-bottom: 1.5rem;
position: relative;
}

label {
display: block;
margin-bottom: 0.5rem;
color: #2c3e50;
font-weight: 500;
}

.input-group {
position: relative;
}

.input-group i {
position: absolute;
left: 15px;
top: 50%;
transform: translateY(-50%);
color: #95a5a6;
}

input {
width: 100%;
padding: 0.75rem 1rem 0.75rem 2.5rem;
border: 2px solid #e0e0e0;
border-radius: 10px;
font-size: 1rem;
transition: all 0.3s ease;
background: #f8f9fa;
}

input:focus {
border-color: #3498db;
outline: none;
box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

button {
width: 100%;
padding: 1rem;
background: #3498db;
color: white;
border: none;
border-radius: 10px;
font-size: 1rem;
cursor: pointer;
transition: all 0.3s ease;
font-weight: 600;
text-transform: uppercase;
letter-spacing: 1px;
}

button:hover {
background: #2980b9;
transform: translateY(-2px);
box-shadow: 0 5px 15px rgba(52, 152, 219, 0.3);
}

.message {
margin-top: 1rem;
padding: 1rem;
border-radius: 10px;
text-align: center;
font-weight: 500;
}

.error {
background: #fff3f3;
color: #e74c3c;
border: 1px solid #ffd7d7;
}

.success {
background: #f0fff4;
color: #27ae60;
border: 1px solid #d4ffdf;
}

.social-login {
margin-top: 2rem;
text-align: center;
}

.social-login p {
color: #7f8c8d;
margin-bottom: 1rem;
position: relative;
}

.social-login p::before,
.social-login p::after {
content: "";
position: absolute;
top: 50%;
width: 45%;
height: 1px;
background: #e0e0e0;
}

.social-login p::before {
left: 0;
}

.social-login p::after {
right: 0;
}

.social-icons {
display: flex;
justify-content: center;
gap: 1rem;
}

.social-icons button {
width: 50px;
height: 50px;
border-radius: 50%;
display: flex;
align-items: center;
justify-content: center;
font-size: 1.2rem;
background: #f8f9fa;
color: #333;
border: 2px solid #e0e0e0;
transition: all 0.3s ease;
}

.social-icons button:hover {
transform: translateY(-2px);
box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.social-icons .google:hover {
color: #db4437;
border-color: #db4437;
}

.social-icons .facebook:hover {
color: #4267B2;
border-color: #4267B2;
}

#loginForm, #signupForm {
display: none;
}

#loginForm.active, #signupForm.active {
display: block;
}

@media (max-width: 480px) {
.container {
    padding: 1.5rem;
}

.brand h1 {
    font-size: 1.5rem;
}
}