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

html, body {
    overflow-x: hidden;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 480px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    padding: 30px 0;
}

.back-home {
    display: block;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 0.9rem;
    margin-bottom: 20px;
    transition: all 0.2s;
}

.back-home:hover {
    color: white;
}

.logo {
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
}

main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.auth-card {
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
    width: 100%;
    overflow: hidden;
}

.auth-tabs {
    display: flex;
    border-bottom: 1px solid #e5e7eb;
}

.tab-btn {
    flex: 1;
    padding: 16px;
    background: none;
    border: none;
    font-size: 1rem;
    font-weight: 500;
    color: #6b7280;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
}

.tab-btn.active {
    color: #4f46e5;
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 3px;
    background: #4f46e5;
}

.tab-btn:hover {
    background: #f9fafb;
}

.auth-form {
    display: none;
    padding: 30px;
}

.auth-form.active {
    display: block;
}

.auth-form h2 {
    color: #1f2937;
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.subtitle {
    color: #6b7280;
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: #374151;
    margin-bottom: 6px;
}

.form-group input {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: #4f46e5;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.error-message {
    color: #dc2626;
    font-size: 0.875rem;
    margin-bottom: 16px;
    min-height: 20px;
}

.submit-btn {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
}

.auth-footer {
    padding: 20px 30px;
    background: #f9fafb;
    text-align: center;
    font-size: 0.875rem;
    color: #6b7280;
}

.auth-footer a {
    color: #4f46e5;
    text-decoration: none;
    font-weight: 500;
}

.auth-footer a:hover {
    text-decoration: underline;
}

.separator {
    margin: 0 10px;
    color: #d1d5db;
}

.info {
    color: #9ca3af;
}

.field-hint {
    font-size: 0.8rem;
    color: #6b7280;
    margin-top: 6px;
    font-style: italic;
}

.birthday-selects {
    display: flex;
    gap: 10px;
}

.birthday-selects select {
    padding: 12px 15px;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    font-size: 1rem;
    background: white;
    color: #374151;
    cursor: pointer;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.birthday-selects select:focus {
    outline: none;
    border-color: #4f46e5;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.birthday-selects select:first-child {
    flex: 2;
    min-width: 140px;
}

.birthday-selects select:last-child {
    flex: 1;
    min-width: 90px;
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    header {
        padding: 25px 0;
    }
    
    .auth-card {
        border-radius: 12px;
    }
}

@media (max-width: 600px) {
    header {
        padding: 20px 0;
    }
    
    .logo {
        font-size: 1.3rem;
    }
    
    .auth-form h2 {
        font-size: 1.3rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    .auth-form {
        padding: 20px 15px;
    }
    
    .auth-form h2 {
        font-size: 1.2rem;
    }
    
    .form-group input {
        padding: 10px 12px;
        font-size: 0.95rem;
    }
    
    .submit-btn {
        padding: 12px;
        font-size: 0.95rem;
    }
    
    .auth-footer {
        padding: 15px 20px;
        font-size: 0.8rem;
    }
    
    .tab-btn {
        padding: 12px;
        font-size: 0.9rem;
    }
}