:root {
  --font-scale: 1;
}

/* Site chrome (landing, dashboard, auth): whole-page zoom is fine. */
html {
  zoom: var(--font-scale);
}

@supports not (zoom: 1) {
  html {
    font-size: calc(100% * var(--font-scale));
  }
}

/*
 * Exercise shells (Lesen Teil 1 native, Hören native, live Lesen/Sprach/Schreiben):
 * keep top/bottom chrome unscaled. Scale only the content region.
 */
html:has(.zet-lesen-fs),
html:has(.zet-hoeren-fs),
html:has(.exam-run-shell),
html[data-zetb2-skill="lesen"],
html[data-zetb2-skill="schreiben"] {
  zoom: 1;
}

@supports not (zoom: 1) {
  html:has(.zet-lesen-fs),
  html:has(.zet-hoeren-fs),
  html:has(.exam-run-shell),
  html[data-zetb2-skill="lesen"],
  html[data-zetb2-skill="schreiben"] {
    font-size: 100%;
  }
}

/* Native Teil 1 / Hören: scroll board only (toolbar + sticky bar stay put). */
.zet-lesen-fs .zet-lesen-scroll,
.zet-hoeren-fs .zet-hoeren-scroll,
/* Live iframe shells mark the exercise body via JS. */
[data-font-scale-content] {
  zoom: var(--font-scale);
}

@supports not (zoom: 1) {
  .zet-lesen-fs .zet-lesen-scroll,
  .zet-hoeren-fs .zet-hoeren-scroll,
  [data-font-scale-content] {
    font-size: calc(100% * var(--font-scale));
  }
}

.font-scale-control {
  position: relative;
  flex-shrink: 0;
  z-index: 130;
}

.font-scale-control.is-open {
  z-index: 1000;
}

.font-scale-trigger {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid rgba(255, 204, 0, 0.22);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  color: #f6f6f6;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, color 0.2s, box-shadow 0.2s;
}

.font-scale-trigger:hover {
  border-color: rgba(255, 204, 0, 0.45);
  color: #ffcc00;
  background: rgba(255, 204, 0, 0.08);
}

.font-scale-control.is-open .font-scale-trigger {
  border-color: rgba(255, 204, 0, 0.55);
  background: rgba(255, 204, 0, 0.12);
  color: #ffcc00;
  box-shadow: 0 0 0 3px rgba(255, 204, 0, 0.14);
}

.font-scale-icon {
  width: 18px;
  height: 18px;
}

.font-scale-panel {
  position: absolute;
  top: calc(100% + 10px);
  /* Default: grow to the physical right of the trigger (Lesen/Hören toolbars). */
  inset-inline-end: auto;
  inset-inline-start: auto;
  left: 0;
  right: auto;
  width: min(280px, calc(100vw - 24px));
  padding: 14px;
  border-radius: 16px;
  border: 1px solid rgba(255, 204, 0, 0.22);
  background: rgba(18, 18, 18, 0.98);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(12px);
  z-index: 1001;
}

.font-scale-panel[hidden] {
  display: none;
}

.font-scale-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
}

.font-scale-label {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
}

.font-scale-reset {
  display: inline-grid;
  place-items: center;
  width: 30px;
  height: 30px;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: #b8b0a4;
  cursor: pointer;
  transition: color 0.2s, background 0.2s;
}

.font-scale-reset svg {
  width: 16px;
  height: 16px;
}

.font-scale-reset:hover {
  color: #ffcc00;
  background: rgba(255, 204, 0, 0.08);
}

.font-scale-stepper {
  display: grid;
  grid-template-columns: 44px 1fr 44px;
  align-items: center;
  gap: 8px;
  padding: 8px;
  border-radius: 14px;
  border: 1px solid rgba(255, 204, 0, 0.14);
  background: rgba(255, 255, 255, 0.03);
}

.font-scale-step {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid rgba(255, 204, 0, 0.18);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.04);
  color: #fff;
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, opacity 0.2s;
}

.font-scale-step:hover:not(:disabled) {
  border-color: rgba(255, 204, 0, 0.45);
  background: rgba(255, 204, 0, 0.1);
  color: #ffcc00;
}

.font-scale-step:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.font-scale-value {
  text-align: center;
  font-size: 15px;
  font-weight: 700;
  color: #ffcc00;
  direction: ltr;
}

/* Light mode: readable zoom panel (cream chrome + dark ink) */
html[data-color-scheme="light"] .font-scale-panel {
  background: #fffaf0;
  border-color: rgba(184, 134, 11, 0.45);
  color: #1a140c;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.14);
}
html[data-color-scheme="light"] .font-scale-label {
  color: #1a140c;
}
html[data-color-scheme="light"] .font-scale-reset {
  color: #5a4a38;
}
html[data-color-scheme="light"] .font-scale-reset:hover {
  color: #9a6b00;
  background: rgba(184, 134, 11, 0.12);
}
html[data-color-scheme="light"] .font-scale-stepper {
  border-color: rgba(184, 134, 11, 0.35);
  background: #fff;
}
html[data-color-scheme="light"] .font-scale-step {
  border-color: rgba(184, 134, 11, 0.4);
  background: #fff;
  color: #1a140c;
}
html[data-color-scheme="light"] .font-scale-step:hover:not(:disabled) {
  border-color: #9a6b00;
  background: rgba(255, 204, 0, 0.18);
  color: #9a6b00;
}
html[data-color-scheme="light"] .font-scale-value {
  color: #9a6b00;
}

@media (max-width: 900px) {
  .font-scale-control.is-open {
    z-index: 210;
  }
  /* App topbar gear sits on the right — open the panel leftward so it stays on screen. */
  .nav-end .font-scale-panel,
  .app-shell .font-scale-panel {
    left: auto;
    right: 0;
    inset-inline-start: auto;
    inset-inline-end: auto;
  }
}

@media (max-width: 640px) {
  .font-scale-panel {
    /* Physical right growth (works in RTL without flipping to the wrong side). */
    inset-inline-end: auto;
    inset-inline-start: auto;
    left: 0;
    right: auto;
    max-width: min(280px, calc(100vw - 16px));
  }
  /* Topbar / exam gear on the right — open leftward into the viewport */
  .nav-end .font-scale-panel,
  .app-shell .font-scale-panel,
  .exam-run-shell .font-scale-panel {
    left: auto;
    right: 0;
  }
}

/* Appearance toggle — same chrome size as font-scale trigger */
.color-scheme-toggle {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid rgba(255, 204, 0, 0.22);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  color: #f6f6f6;
  cursor: pointer;
  flex-shrink: 0;
  transition: border-color 0.2s, background 0.2s, color 0.2s;
}
.color-scheme-toggle:hover {
  border-color: rgba(255, 204, 0, 0.45);
  color: #ffcc00;
}
.color-scheme-toggle .color-scheme-icon {
  width: 1.1rem;
  height: 1.1rem;
  display: none;
}
html[data-color-scheme="dark"] .color-scheme-toggle .color-scheme-icon--moon,
html:not([data-color-scheme="light"]) .color-scheme-toggle .color-scheme-icon--moon {
  display: block;
}
html[data-color-scheme="light"] .color-scheme-toggle .color-scheme-icon--sun {
  display: block;
}
html[data-color-scheme="light"] .color-scheme-toggle .color-scheme-icon--moon {
  display: none;
}
html[data-color-scheme="light"] .color-scheme-toggle {
  background: rgba(0, 0, 0, 0.04);
  border-color: rgba(180, 130, 20, 0.35);
  color: #5a4a38;
}
html[data-color-scheme="light"] .color-scheme-toggle:hover {
  color: #9a6b00;
  border-color: rgba(180, 130, 20, 0.55);
}
html[data-color-scheme="light"] .font-scale-trigger {
  background: rgba(0, 0, 0, 0.04);
  border-color: rgba(180, 130, 20, 0.35);
  color: #5a4a38;
}