Initial commit: OAuth IAM Laravel application

Laravel-based OAuth/IAM service with Passport, Vue 3 frontend, and
Docker Compose setup for local and production deployment.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

resources/scss/components/_button.scss

@@ -0,0 +1,107 @@
+@use '../abstracts/variables' as *;
+@use '../abstracts/mixins' as *;
+
+.btn {
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    gap: $space-2;
+    padding: $space-2 $space-4;
+    border-radius: $radius-lg;
+    font-size: $font-sm;
+    font-weight: 500;
+    transition: $transition-fast;
+    white-space: nowrap;
+
+    @include focus-ring;
+
+    &:disabled {
+        opacity: 0.5;
+        cursor: not-allowed;
+    }
+
+    &--full {
+        width: 100%;
+    }
+
+    &--pill {
+        border-radius: $radius-full;
+    }
+}
+
+.btn--primary {
+    background: var(--gradient-accent);
+    color: var(--color-text-on-accent);
+    box-shadow: 0 1px 2px 0 rgb(79 70 229 / 20%);
+
+    &:hover:not(:disabled) {
+        opacity: 0.9;
+    }
+}
+
+// Variante sólida (no-gradiente) del acento, para acciones dentro de tarjetas
+// donde el gradiente sería demasiado.
+.btn--accent {
+    background: var(--color-accent);
+    color: var(--color-text-on-accent);
+    border-radius: $radius-md;
+    padding: $space-2 $space-4;
+
+    &:hover:not(:disabled) {
+        background: var(--color-accent-strong);
+    }
+}
+
+.btn--secondary {
+    background: transparent;
+    border: 1px solid var(--color-border-strong);
+    color: var(--color-text-primary);
+
+    @include dark {
+        border-color: var(--color-border);
+    }
+
+    &:hover:not(:disabled) {
+        background: var(--color-surface-muted);
+    }
+}
+
+// Botón oscuro/claro invertido (usado para "Salir" en la nav).
+.btn--invert {
+    background: #111827;
+    color: #ffffff;
+    border-radius: $radius-full;
+
+    &:hover:not(:disabled) {
+        background: #374151;
+    }
+
+    @include dark {
+        background: #ffffff;
+        color: #111827;
+
+        &:hover:not(:disabled) {
+            background: #e5e7eb;
+        }
+    }
+}
+
+// Botón oscuro sólido (asignar rol dentro de Usuarios).
+.btn--dark {
+    background: #111827;
+    color: #ffffff;
+    border-radius: $radius-md;
+
+    &:hover:not(:disabled) {
+        background: #374151;
+    }
+
+    @include dark {
+        background: #ffffff;
+        color: #111827;
+
+        &:hover:not(:disabled) {
+            background: #e5e7eb;
+        }
+    }
+}