resbuilder_app/app/src/main/res/layout/activity_login.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="?attr/colorSurface"
    tools:context=".ui.LoginActivity">

    <!-- Decorative gradient background behind card -->
    <View
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="@drawable/bg_gradient_primary"
        app:layout_constraintBottom_toTopOf="@id/guidelineTop"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:layout_width="120dp"
        android:layout_height="120dp"
        android:layout_marginEnd="@dimen/space_lg"
        android:layout_marginBottom="@dimen/space_lg"
        android:alpha="0.15"
        android:contentDescription="@null"
        android:src="@drawable/ic_sparkle"
        app:layout_constraintBottom_toTopOf="@id/guidelineTop"
        app:layout_constraintEnd_toEndOf="parent" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guidelineTop"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.40" />

    <!-- Main content card -->
    <com.google.android.material.card.MaterialCardView
        android:id="@+id/loginCard"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginHorizontal="@dimen/space_lg"
        app:cardBackgroundColor="?attr/colorSurfaceContainerLow"
        app:cardCornerRadius="@dimen/card_radius_large"
        app:cardElevation="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_chainStyle="packed"
        app:strokeColor="?attr/colorOutlineVariant"
        app:strokeWidth="1dp">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center_horizontal"
            android:orientation="vertical"
            android:padding="@dimen/space_xl">

            <!-- App icon with tonal surface -->
            <com.google.android.material.card.MaterialCardView
                android:layout_width="@dimen/space_xxl"
                android:layout_height="@dimen/space_xxl"
                app:cardBackgroundColor="?attr/colorPrimaryContainer"
                app:cardCornerRadius="@dimen/card_radius_large"
                app:cardElevation="0dp"
                app:strokeWidth="0dp">

                <ImageView
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:contentDescription="@string/cd_app_logo"
                    android:padding="@dimen/space_md"
                    android:scaleType="centerInside"
                    android:src="@drawable/ic_launcher_foreground"
                    app:tint="?attr/colorOnPrimaryContainer" />
            </com.google.android.material.card.MaterialCardView>

            <!-- Title -->
            <TextView
                android:id="@+id/loginTitle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="@dimen/space_lg"
                android:text="@string/app_title"
                android:textAlignment="center"
                android:textAppearance="?attr/textAppearanceHeadlineMedium"
                android:textColor="?attr/colorOnSurface"
                android:textStyle="bold" />

            <!-- Subtitle -->
            <TextView
                android:id="@+id/loginSubtitle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="@dimen/space_sm"
                android:text="@string/welcome_subtitle"
                android:textAlignment="center"
                android:textAppearance="?attr/textAppearanceBodyLarge"
                android:textColor="?attr/colorOnSurfaceVariant" />

            <!-- Divider -->
            <View
                android:layout_width="match_parent"
                android:layout_height="1dp"
                android:layout_marginVertical="@dimen/space_lg"
                android:background="?attr/colorOutlineVariant" />

            <!-- Sign in button -->
            <com.google.android.material.button.MaterialButton
                android:id="@+id/googleSignInButton"
                style="@style/Widget.Material3.Button.OutlinedButton"
                android:layout_width="match_parent"
                android:layout_height="56dp"
                android:fontFamily="sans-serif-medium"
                android:minHeight="@dimen/button_height"
                android:text="@string/sign_in_with_google"
                android:textAllCaps="false"
                android:textColor="?attr/colorOnSurface"
                android:textSize="16sp"
                app:cornerRadius="14dp"
                app:icon="@drawable/ic_google"
                app:iconGravity="textStart"
                app:iconPadding="@dimen/space_md"
                app:iconSize="24dp"
                app:iconTint="@null"
                app:strokeColor="?attr/colorOutline"
                app:strokeWidth="1.5dp" />

            <!-- Helper text -->
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="@dimen/space_md"
                android:text="@string/sign_in_terms"
                android:textAlignment="center"
                android:textAppearance="?attr/textAppearanceBodySmall"
                android:textColor="?attr/colorOnSurfaceVariant" />
        </LinearLayout>
    </com.google.android.material.card.MaterialCardView>

    <!-- Progress indicator -->
    <com.google.android.material.progressindicator.CircularProgressIndicator
        android:id="@+id/loginProgress"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:indeterminate="true"
        android:visibility="gone"
        app:indicatorColor="?attr/colorOnPrimary"
        app:indicatorSize="@dimen/space_xxl"
        app:layout_constraintBottom_toTopOf="@id/loginCard"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@id/guidelineTop"
        app:trackColor="?attr/colorPrimaryContainer" />

</androidx.constraintlayout.widget.ConstraintLayout>