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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 24px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    padding: 40px;
    width: 100%;
    max-width: 400px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.container:hover {
    transform: translateY(-5px);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.15);
}

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

.logo img {
    width: 80px;
    height: 80px;
    object-fit: contain;
    margin-bottom: 15px;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.1));
    transition: transform 0.3s ease;
}

.logo img:hover {
    transform: scale(1.1);
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
}

.tabs {
    display: flex;
    margin-bottom: 30px;
    background: #f8f9fa;
    border-radius: 12px;
    padding: 4px;
}

.tab-button {
    flex: 1;
    padding: 12px 20px;
    border: none;
    background: transparent;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    color: #6c757d;
}

.tab-button.active {
    background: white;
    color: #495057;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.tab-button:hover:not(.active) {
    background: rgba(255, 255, 255, 0.5);
    color: #495057;
}

.form-content {
    display: none;
}

.form-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

input {
    width: 100%;
    padding: 16px 20px;
    margin-bottom: 16px;
    border: 2px solid #e9ecef;
    border-radius: 12px;
    font-size: 16px;
    transition: all 0.3s ease;
    background: #f8f9fa;
}

input:focus {
    outline: none;
    border-color: #667eea;
    background: white;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    transform: translateY(-2px);
}

input::placeholder {
    color: #6c757d;
}

.form-button {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.form-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

.form-button:active {
    transform: translateY(0);
}

.forgot-password {
    display: block;
    text-align: center;
    color: #667eea;
    text-decoration: none;
    font-size: 14px;
    margin-bottom: 20px;
    transition: color 0.3s ease;
}

.forgot-password:hover {
    color: #764ba2;
    text-decoration: underline;
}

.social-login {
    text-align: center;
    margin-top: 30px;
}

.social-login p {
    color: #6c757d;
    margin-bottom: 20px;
    font-size: 14px;
}

.social-icons {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.social-icons button {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 2px solid #e9ecef;
    background: white;
    cursor: pointer;
    font-size: 18px;
    font-weight: 600;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.social-icons button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    border-color: #667eea;
}

.social-icons button:nth-child(1) {
    color: #db4437;
}

.social-icons button:nth-child(2) {
    color: #4267B2;
}

.social-icons button:nth-child(3) {
    color: #1da1f2;
}

/* Responsive Design */
@media (max-width: 480px) {
    body {
        padding: 10px;
    }
    
    .container {
        padding: 30px 20px;
        margin: 10px;
    }
    
    .logo h1 {
        font-size: 2rem;
    }
    
    .logo img {
        width: 60px;
        height: 60px;
    }
    
    input {
        padding: 14px 16px;
        font-size: 16px; /* Prevents zoom on iOS */
    }
    
    .form-button {
        padding: 14px;
    }
    
    .tab-button {
        padding: 10px 16px;
        font-size: 14px;
    }
}

@media (max-width: 360px) {
    .container {
        padding: 20px 15px;
    }
    
    .social-icons {
        gap: 10px;
    }
    
    .social-icons button {
        width: 45px;
        height: 45px;
        font-size: 16px;
    }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
    .tab-button:hover:not(.active) {
        background: transparent;
    }
    
    .container:hover {
        transform: none;
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    }
    
    .logo img:hover {
        transform: none;
    }
    
    input:focus {
        transform: none;
    }
    
    .form-button:hover {
        transform: none;
        box-shadow: none;
    }
    
    .social-icons button:hover {
        transform: none;
        box-shadow: none;
        border-color: #e9ecef;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .container {
        background: white;
        border: 2px solid #000;
    }
    
    input {
        border-color: #000;
    }
    
    .form-button {
        background: #000;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}