First commit

frontend/app/assets/css/_auth.scss

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+@use 'mixins' as *;
+
+// ---------- Sign in ----------
+// Anyone may read Mathew; writing it takes an account. The gate is what a
+// signed-out visitor of the editor finds in the form's place (AuthGate.vue), and
+// the popup is the way in from anywhere (AuthModal.vue). The popup sits above the
+// fullscreen editor (1000) and its own popups (1100, 1150): a save that comes
+// back refusing an expired session has to be answered where the editor already
+// fills the screen.
+.auth-overlay { @include overlay(1160); }
+
+.auth-modal {
+  @include sheet(420px);
+
+  &:focus, &:focus-visible { outline: none; }
+}
+
+.auth-modal-head { @include sheet-head; }
+
+.auth-title { @include sheet-title; }
+
+.auth-modal-body { padding: 18px; }
+
+// the two ways in, side by side
+.auth-tabs { @include segmented; margin-bottom: 18px; }
+
+.auth-tab { @include segmented-tab(7px 14px, 0.84rem); }
+
+// why the popup turned up on its own — a session that expired mid-draft
+.auth-notice {
+  margin: -6px 0 16px;
+  padding: 10px 12px;
+  border: 1px solid color-mix(in srgb, var(--danger) 30%, var(--border));
+  border-radius: 10px;
+  background: color-mix(in srgb, var(--danger) 7%, var(--surface));
+  color: var(--muted);
+  font-size: 0.84rem;
+  line-height: 1.5;
+}
+
+.auth-modal .field input {
+  width: 100%;
+  padding: 12px 14px;
+  border-radius: 11px;
+  border: 1px solid var(--border);
+  background: var(--bg-elev);
+}
+
+.auth-submit { width: 100%; margin-top: 2px; }
+
+.auth-switch {
+  margin: 16px 0 0;
+  text-align: center;
+  font-size: 0.84rem;
+  color: var(--muted);
+
+  button {
+    color: var(--accent);
+    font-weight: 650;
+
+    &:hover { text-decoration: underline; }
+  }
+}
+
+@include popup-anim(
+  'auth-popup',
+  '.auth-modal',
+  0.16s,
+  transform 0.2s cubic-bezier(0.22, 0.61, 0.36, 1),
+  -10px
+);
+
+// the editor's stand-in until there is a session
+.auth-gate {
+  max-width: 480px;
+  margin: clamp(36px, 8vh, 92px) auto;
+  padding: 34px 30px 30px;
+  border: 1px solid var(--border);
+  border-radius: 18px;
+  background: var(--bg-elev);
+  box-shadow: var(--shadow-lg);
+  text-align: center;
+}
+
+.auth-gate-mark {
+  display: grid;
+  place-items: center;
+  width: 46px;
+  height: 46px;
+  margin: 0 auto 16px;
+  border: 1px solid color-mix(in srgb, var(--accent) 28%, var(--border));
+  border-radius: 50%;
+  background: color-mix(in srgb, var(--accent) 10%, transparent);
+  color: var(--accent);
+}
+
+.auth-gate-title {
+  margin: 0 0 8px;
+  font-size: 1.3rem;
+  letter-spacing: -0.01em;
+  color: var(--text);
+}
+
+.auth-gate-text {
+  max-width: 38ch;
+  margin: 0 auto 22px;
+  color: var(--muted);
+  font-size: 0.93rem;
+  line-height: 1.6;
+}
+
+.auth-gate-actions {
+  display: flex;
+  flex-wrap: wrap;
+  justify-content: center;
+  gap: 10px;
+}
+
+.auth-gate-fine { margin: 18px 0 0; font-size: 0.8rem; color: var(--faint); }