.auth-screen {
    position: fixed;
    inset: 0;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    animation: fadeIn 0.3s ease;
}

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

.auth-container {
    width: 100%;
    max-width: 420px;
    padding: 40px;
    background: var(--bg-secondary);
    border-radius: 24px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-lg);
}

.auth-logo {
    text-align: center;
    margin-bottom: 32px;
}

.auth-logo svg {
    width: 64px;
    height: 64px;
    color: var(--accent);
    margin-bottom: 16px;
}

.auth-logo h1 {
    font-size: 28px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
}

.auth-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    background: var(--bg-tertiary);
    padding: 4px;
    border-radius: 12px;
}

.auth-tab {
    flex: 1;
    padding: 12px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.auth-tab.active {
    background: var(--accent);
    color: white;
}

.auth-tab:hover:not(.active) {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
    animation: slideIn 0.3s ease;
}

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

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

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-group input {
    width: 100%;
    padding: 14px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 14px;
    transition: all 0.2s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-dim);
}

.form-group input::placeholder {
    color: var(--text-muted);
}

.auth-submit {
    width: 100%;
    padding: 14px;
    background: var(--accent);
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: 8px;
}

.auth-submit:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(59, 130, 246, 0.4);
}

.auth-submit:active {
    transform: translateY(0);
}

.auth-error {
    margin-top: 16px;
    padding: 12px;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: 8px;
    color: var(--danger);
    font-size: 13px;
    text-align: center;
    min-height: 20px;
}

.auth-error:empty {
    display: none;
}