:root {
  --viewer-ink: #152547;
  --viewer-muted: #52617b;
  --viewer-bg: #f4f8fc;
  --viewer-paper: #ffffff;
  --viewer-rule: #d7e3ee;
  --viewer-blue: #12295c;
  --viewer-blue-soft: #e4f1fb;
  --viewer-reader-bg: #dfe7ee;
  --viewer-focus: #765300;
  --viewer-error: #9b2c2c;
}

body.tta-plan-viewer-page {
  min-width: 0;
  margin: 0;
  background: var(--viewer-bg);
  color: var(--viewer-ink);
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, Arial, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.65;
  overflow-wrap: break-word;
}

.tta-plan-main {
  width: min(calc(100% - 2rem), 74rem);
  margin-inline: auto;
  padding: clamp(1.5rem, 3.5vw, 3rem) 0 3.5rem;
}

.tta-plan-heading {
  max-width: 66rem;
  margin-bottom: clamp(1.5rem, 3vw, 2.5rem);
}

.tta-plan-category,
.tta-kicker {
  margin: 0 0 .5rem;
  color: #366d9b;
  font-size: .9rem;
  font-weight: 800;
  letter-spacing: .04em;
  line-height: 1.5;
  text-transform: uppercase;
}

body.tta-plan-viewer-page h1 {
  max-width: 24ch;
  margin: 0;
  color: var(--viewer-ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 3.25rem;
  font-weight: 700;
  letter-spacing: -.025em;
  line-height: 1.12;
  text-wrap: balance;
}

.tta-plan-metadata {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem 1.4rem;
  margin: 1rem 0 0;
  padding: 0;
  color: var(--viewer-muted);
  list-style: none;
}

.tta-plan-metadata li { min-width: 0; }
.tta-plan-metadata span {
  margin-right: .4rem;
  color: var(--viewer-ink);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .045em;
  text-transform: uppercase;
}

.tta-plan-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.5rem;
}

.tta-action {
  box-sizing: border-box;
  min-height: 3rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .7rem 1.1rem;
  border: 1px solid var(--viewer-blue);
  border-radius: .6rem;
  font: inherit;
  font-weight: 700;
  line-height: 1.35;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
}

.tta-action-primary { background: var(--viewer-blue); color: #fff; }
.tta-action-secondary { background: var(--viewer-paper); color: var(--viewer-blue); }
.tta-action:hover { box-shadow: 0 0 0 2px var(--viewer-blue-soft); }
.tta-action:disabled { cursor: wait; opacity: .68; }
.tta-action:focus-visible,
.tta-pdf-preview summary:focus-visible,
.tta-online-lesson a:focus-visible,
.tta-pdf-tool:focus-visible,
.tta-pdf-viewport:focus-visible {
  outline: 3px solid var(--viewer-focus);
  outline-offset: 3px;
}

.tta-export-note {
  max-width: 70ch;
  margin: .85rem 0 0;
  color: var(--viewer-muted);
  font-size: .92rem;
  line-height: 1.55;
}

.tta-export-status {
  min-height: 1.6em;
  margin: .3rem 0 0;
  color: var(--viewer-blue);
  font-size: .9rem;
  font-weight: 700;
}

.tta-export-status[data-state="error"] { color: var(--viewer-error); }

.tta-online-lesson {
  display: grid;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.tta-essential-question,
.tta-passage-card {
  box-sizing: border-box;
  min-width: 0;
  border: 1px solid var(--viewer-rule);
  border-radius: .8rem;
  background: var(--viewer-paper);
}

.tta-essential-question {
  padding: 1.75rem;
  border: 2px solid #9bc9eb;
  background: #eaf4fb;
}

.tta-essential-question h2 {
  max-width: 36ch;
  margin: 0;
  color: var(--viewer-ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2rem;
  line-height: 1.3;
  text-wrap: balance;
}

.tta-lesson-section > h2,
.tta-pdf-preview summary {
  margin: 0 0 .8rem;
  color: var(--viewer-ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.75rem;
  line-height: 1.3;
}

.tta-passage-card { padding: clamp(1rem, 2.5vw, 1.5rem); }
.tta-lesson-section:not(.tta-passage-card) {
  min-width: 0;
  padding-top: 1.25rem;
  border-top: 2px solid var(--viewer-blue);
}
.tta-definition-list { display: grid; gap: 0; margin: 0; }
.tta-definition-row {
  display: grid;
  grid-template-columns: minmax(8rem, .28fr) minmax(0, 1fr);
  gap: 1rem;
  padding: .8rem 0;
  border-top: 1px solid var(--viewer-rule);
}
.tta-definition-row:first-child { border-top: 0; }
.tta-definition-row dt {
  color: #366d9b;
  font-size: .82rem;
  font-weight: 800;
  letter-spacing: .035em;
  line-height: 1.45;
  text-transform: uppercase;
}
.tta-definition-row dd {
  min-width: 0;
  max-width: 75ch;
  margin: 0;
  font-size: 1.08rem;
  line-height: 1.75;
  text-wrap: pretty;
}

.tta-lesson-grid,
.tta-lesson-notes {
  display: block;
  min-width: 0;
}

.tta-lesson-grid { border-bottom: 1px solid var(--viewer-rule); }
.tta-lesson-card {
  min-width: 0;
  padding: 1.1rem 0 1.25rem;
  border-top: 1px solid var(--viewer-rule);
}
.tta-lesson-card:first-child { border-top: 0; }
.tta-lesson-notes {
  padding: .25rem 1.25rem;
  border: 1px solid var(--viewer-rule);
  border-radius: .8rem;
  background: #edf3f8;
}
.tta-lesson-note {
  min-width: 0;
  padding: 1rem 0;
  border-top: 1px solid #cbd8e4;
}
.tta-lesson-note:first-child { border-top: 0; }
.tta-lesson-card h3,
.tta-lesson-note strong {
  display: block;
  margin: 0 0 .5rem;
  color: var(--viewer-blue);
  font-family: inherit;
  font-size: 1.08rem;
  font-weight: 800;
  line-height: 1.45;
}
.tta-lesson-card p,
.tta-lesson-note p {
  max-width: 75ch;
  margin: 0;
  font-size: 1.08rem;
  line-height: 1.75;
  text-wrap: pretty;
  white-space: pre-line;
}

.tta-pdf-preview {
  min-width: 0;
  padding: clamp(1rem, 2.4vw, 1.5rem);
  border: 1px solid var(--viewer-rule);
  border-radius: .8rem;
  background: var(--viewer-paper);
}
.tta-pdf-preview summary {
  margin: 0;
  min-height: 2.75rem;
  align-items: center;
  cursor: pointer;
  font-weight: 700;
}
.tta-pdf-preview[open] summary { margin-bottom: .75rem; }
.tta-pdf-reader {
  min-width: 0;
}
.tta-pdf-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  padding: .75rem;
  border: 1px solid var(--viewer-rule);
  border-bottom: 0;
  border-radius: .55rem .55rem 0 0;
  background: #edf3f8;
}
.tta-pdf-tool {
  box-sizing: border-box;
  min-width: 2.75rem;
  min-height: 2.75rem;
  padding: .55rem .8rem;
  border: 1px solid #9bafc1;
  border-radius: .45rem;
  background: var(--viewer-paper);
  color: var(--viewer-blue);
  font: inherit;
  font-size: .95rem;
  font-weight: 700;
  line-height: 1.2;
  white-space: nowrap;
  cursor: pointer;
}
.tta-pdf-tool-icon {
  padding-inline: .65rem;
  font-size: 1.35rem;
}
.tta-pdf-tool:hover:not(:disabled) { background: var(--viewer-blue-soft); }
.tta-pdf-tool:active:not(:disabled) { background: #cfe5f6; }
.tta-pdf-tool[aria-pressed="true"] {
  border-color: var(--viewer-blue);
  background: var(--viewer-blue);
  color: #fff;
}
.tta-pdf-tool:disabled { cursor: not-allowed; opacity: .55; }
.tta-pdf-toolbar-divider {
  width: 1px;
  height: 1.75rem;
  margin-inline: .1rem;
  background: #9bafc1;
}
.tta-pdf-zoom-value {
  min-width: 4.5rem;
  color: var(--viewer-ink);
  font-size: .95rem;
  font-weight: 800;
  text-align: center;
  white-space: nowrap;
}
.tta-pdf-status {
  min-height: 1.7em;
  margin: 0;
  padding: .6rem .8rem;
  border-inline: 1px solid var(--viewer-rule);
  background: var(--viewer-paper);
  color: var(--viewer-muted);
  font-size: .94rem;
  font-weight: 700;
}
.tta-pdf-status[data-state="error"] { color: var(--viewer-error); }
.tta-pdf-viewport {
  box-sizing: border-box;
  width: 100%;
  min-height: 28rem;
  height: min(76vh, 54rem);
  overflow: auto;
  overscroll-behavior: contain;
  border: 1px solid #aebdca;
  border-radius: 0 0 .55rem .55rem;
  background: var(--viewer-reader-bg);
}
.tta-pdf-pages {
  box-sizing: border-box;
  width: max-content;
  min-width: 100%;
  min-height: 100%;
  padding: 1.25rem;
}
.tta-pdf-page {
  width: max-content;
  margin: 0 auto 1.5rem;
}
.tta-pdf-page:last-child { margin-bottom: 0; }
.tta-pdf-page-surface {
  display: grid;
  place-items: center;
  background: #f7f9fb;
}
.tta-pdf-page-placeholder {
  width: 100%;
  height: 100%;
  min-height: 12rem;
  background: #f7f9fb;
  animation: tta-pdf-loading 1.2s ease-in-out infinite alternate;
}
.tta-pdf-page canvas {
  display: block;
  max-width: none;
  background: #fff;
  box-shadow: 0 2px 8px rgb(21 37 71 / 24%);
}
.tta-pdf-page figcaption {
  margin-top: .45rem;
  color: #40516a;
  font-size: .85rem;
  font-weight: 700;
  text-align: center;
}
.tta-pdf-skeleton {
  width: min(100%, 38rem);
  min-height: 32rem;
  margin-inline: auto;
  background: #f7f9fb;
  box-shadow: 0 2px 8px rgb(21 37 71 / 14%);
  animation: tta-pdf-loading 1.2s ease-in-out infinite alternate;
}
.tta-pdf-error {
  box-sizing: border-box;
  width: min(calc(100% - 2rem), 42rem);
  margin: 1rem auto;
  padding: 1rem;
  border: 1px solid #d9a1a1;
  border-radius: .55rem;
  background: #fff5f5;
  color: var(--viewer-error);
  line-height: 1.6;
}
.tta-pdf-page-error {
  box-sizing: border-box;
  width: min(100%, 32rem);
  padding: 1.25rem;
  color: var(--viewer-error);
  font-weight: 700;
  line-height: 1.6;
  text-align: center;
}
.tta-pdf-help,
.tta-pdf-fallback {
  max-width: 72ch;
  color: var(--viewer-muted);
  font-size: .95rem;
  line-height: 1.6;
}
.tta-pdf-help { margin: .75rem 0 0; }
.tta-pdf-fallback { margin: .35rem 0 0; }
.tta-pdf-fallback a,
.tta-noscript a {
  color: var(--viewer-blue);
  font-weight: 700;
}
.tta-pdf-fallback a {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  padding-inline: .25rem;
}

@keyframes tta-pdf-loading {
  from { opacity: .72; }
  to { opacity: 1; }
}

.tta-plan-footer {
  padding: 1.25rem 1rem;
  background: var(--viewer-blue);
  color: #c6d5e8;
  text-align: center;
}
.tta-plan-footer p,
.tta-noscript { margin: 0; }
.tta-noscript { padding: 1rem; text-align: center; }

@media (max-width: 42rem) {
  .tta-plan-main { width: min(calc(100% - 1rem), 74rem); padding-top: 1.25rem; }
  .tta-plan-actions { display: grid; grid-template-columns: 1fr 1fr; }
  .tta-action { width: 100%; }
  .tta-definition-row { grid-template-columns: 1fr; gap: .3rem; }
  .tta-pdf-preview { padding: .75rem; }
  .tta-pdf-toolbar { padding: .5rem; }
  .tta-pdf-pages { padding: .75rem; }
  .tta-pdf-viewport { min-height: 25rem; height: 72vh; }
  body.tta-plan-viewer-page h1 { font-size: 2.35rem; }
  .tta-essential-question { padding: 1.25rem; }
  .tta-essential-question h2 { font-size: 1.65rem; }
  .tta-lesson-section > h2,
  .tta-pdf-preview summary { font-size: 1.5rem; }
}

@media (max-width: 25rem) {
  .tta-plan-actions { grid-template-columns: 1fr; }
  body.tta-plan-viewer-page h1 { font-size: 2rem; }
  .tta-online-lesson { gap: 1.75rem; }
  .tta-pdf-toolbar-divider { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition: none !important;
    animation: none !important;
  }
}

@media print {
  @page { margin: .55in; }
  body.tta-plan-viewer-page { background: #fff; color: #000; font-size: 10.5pt; }
  .tta-shell,
  .tta-plan-actions,
  .tta-export-note,
  .tta-export-status,
  .tta-pdf-toolbar,
  .tta-pdf-status,
  .tta-pdf-help,
  .tta-pdf-fallback,
  .tta-plan-footer,
  .tta-noscript { display: none !important; }
  .tta-plan-main { width: 100%; padding: 0; }
  body.tta-plan-viewer-page h1 { max-width: none; font-size: 24pt; }
  .tta-online-lesson { gap: 12pt; }
  .tta-essential-question,
  .tta-passage-card,
  .tta-lesson-card,
  .tta-lesson-note,
  .tta-pdf-preview { break-inside: avoid; box-shadow: none; }
  .tta-lesson-grid,
  .tta-lesson-notes { display: block; }
  .tta-lesson-card,
  .tta-lesson-note { margin-bottom: 8pt; }
  .tta-pdf-preview:not([open]) { display: none; }
  .tta-pdf-viewport { height: auto; min-height: 0; overflow: visible; border: 0; }
  .tta-pdf-pages { width: 100%; min-height: 0; padding: 0; }
  .tta-pdf-page { width: 100% !important; break-after: page; }
  .tta-pdf-page canvas { width: 100% !important; height: auto !important; box-shadow: none; }
}

/* v16: keep downloads adjacent to the preview and its controls compact. */
.tta-plan-downloads-v16{margin:0 0 .75rem;}
.tta-plan-downloads-v16 .tta-plan-actions{margin-top:0;}
.tta-pdf-toolbar{
  box-sizing:border-box;width:max-content;max-width:100%;padding:.3rem;
  gap:.3rem;border:0;border-radius:.45rem;background:transparent;
}
.tta-pdf-toolbar::before{
  content:"Plan size";color:var(--viewer-muted);font-size:.88rem;
  font-weight:800;line-height:1.2;white-space:nowrap;
}
.tta-pdf-status{border:1px solid var(--viewer-rule);border-bottom:0;border-radius:.45rem .45rem 0 0;}

@media (max-width:42rem){
  .tta-plan-actions{display:flex;flex-wrap:wrap;}
  .tta-action{width:auto;min-height:44px;flex:1 1 8.5rem;}
  .tta-pdf-preview{padding:.65rem;}
  .tta-pdf-toolbar{max-height:96px;}
  .tta-pdf-toolbar-divider,[data-pdf-readable]{display:none;}
  .tta-pdf-tool{width:auto;min-width:44px;min-height:44px;padding:.45rem .6rem;}
  .tta-pdf-zoom-value{min-width:38px;}
  .tta-pdf-pages{padding:.35rem;}
}