.auth-layout {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(400px, 2fr);
  grid-template-rows: auto 1fr;
  grid-template-areas: "photo header" "photo form";
  min-height: 100svh;
}
.auth-header {
  grid-area: header;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 22px clamp(20px, 3.5vw, 56px);
}
.auth-header .brand { padding: 0; color: var(--ink); }
.auth-header .theme-toggle { min-height: 44px; }
.auth-visual {
  grid-area: photo;
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: #102551;
}
.auth-visual img {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 48%;
  opacity: 0;
  transition: opacity 1s ease-in-out;
}
.auth-visual img:first-child, .auth-visual img.active { opacity: 1; }
.auth-workspace {
  grid-area: form;
  display: grid;
  align-items: center;
  justify-items: center;
  min-width: 0;
  padding: 12px clamp(20px, 3.5vw, 56px) 40px;
}
.auth-card {
  width: min(100%, 384px);
  padding: 25px;
  border: 1px solid var(--line);
  border-radius: 23px;
  background: var(--paper);
}
.auth-modes {
  display: grid;
  grid-template-columns: .8fr 1fr 1.1fr;
  gap: 3px;
  margin-bottom: 20px;
  padding: 3px;
  border-radius: 13px;
  background: var(--surface);
}
.auth-modes button, :root[data-theme] .auth-modes button {
  min-height: 44px;
  min-width: 0;
  padding: 6px 2px;
  border: 0;
  border-radius: 10px;
  color: var(--ink);
  background: transparent;
  font-size: clamp(12px, 1vw, 13px);
}
.auth-modes button:hover, :root[data-theme] .auth-modes button:hover { background: var(--contact); }
.auth-modes button[aria-pressed="true"], :root[data-theme] .auth-modes button[aria-pressed="true"] {
  color: #fff;
  background: var(--brand);
}
.auth-card h1 { margin: 0 0 8px; font-size: clamp(20px, 2vw, 25px); line-height: 1.25; text-wrap: balance; }
.auth-card h1:focus { outline: 0; box-shadow: none; }
.auth-description { margin: 0 0 17px; color: var(--muted); line-height: 1.5; }
.auth-card label { margin: 0 0 10px; color: var(--ink); font-size: 13px; font-weight: 650; gap: 4px; }
.auth-card input, .auth-card select { min-height: 44px; padding: 8px 11px; font-size: 16px; font-weight: 500; }
.auth-card .auth-submit { width: 100%; min-height: 44px; margin-top: 4px; }
.auth-hint { margin: -6px 0 10px; color: var(--muted); font-size: 12px; }
.auth-error, .auth-status { margin: 0 0 9px; font-size: 13px; line-height: 1.5; }
.auth-error { padding: 8px 10px; border-radius: 8px; color: var(--error); background: var(--error-bg); }
.auth-status { color: var(--muted); }
.auth-error:empty, .auth-status:empty { margin: 0; padding: 0; }
.auth-help { margin: 4px 0 -6px; }
.auth-help button, :root[data-theme] .auth-help button {
  min-height: 44px;
  padding: 0;
  border: 0;
  color: var(--link);
  background: none;
}
.auth-help button:hover { text-decoration: underline; }

@media (max-width: 760px) {
  .auth-layout {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto auto 1fr;
    grid-template-areas: "header" "photo" "form";
  }
  .auth-header { padding: 12px 16px; }
  .auth-visual { height: clamp(146px, 43vw, 260px); }
  .auth-visual img { object-position: center 45%; }
  .auth-workspace { align-items: start; padding: 16px 16px 26px; }
  .auth-card { padding: clamp(14px, 4vw, 21px); border-radius: 18px; }
  .auth-modes { margin-bottom: 14px; }
}
@media (prefers-reduced-motion: reduce) {
  .auth-visual img { transition: none; }
}