/* The archive supplies an artistic language, not a timetable or product structure. */
:root { --heading: #34324d; --binding: #c6ab70; --sidebar: 236px; }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
h1, h2, h3 { color: var(--heading); font-weight: 550; overflow-wrap: anywhere; }
input::placeholder, textarea::placeholder { color: var(--muted); opacity: 1; }
button, input, select, textarea { font-weight: 400; }
.button { font-weight: 550; }
.app-body, .public-body { background-color: var(--surround); background-image: radial-gradient(ellipse at 6% 12%, #ffe5ab35, transparent 30rem), radial-gradient(ellipse at 100% 100%, #cbb5dd25, transparent 48rem); background-attachment: fixed; }
.app-main { margin-top: 18px; padding-inline: 48px; padding-bottom: 30px; border-color: #cebeac; border-radius: 12px 12px 5px 5px; background: var(--surface); box-shadow: 0 3px 0 -1px #fbf3e5, 0 4px 0 #c5b9a9, 0 7px 0 -1px #f6ead8, 0 8px 0 #bbac9d, 0 18px 44px #59416f14, 0 0 40px #edbe740d; }
.app-main::before { inset: 11px; width: auto; border: 1px solid #d8c59d; border-radius: 3px; }
.app-main > :not(.paper-corner):not(dialog) { position: relative; }
.paper-corner { position: absolute; top: -1px; width: 138px; height: 138px; background: url("../images/floral-corner.6bc8fc28689f.webp") center / contain no-repeat; pointer-events: none; border-radius: 12px; }
.paper-corner-start { left: -1px; }
.paper-corner-end { right: -1px; transform: scaleX(-1); }
.running-head { min-height: 84px; margin-bottom: 28px; gap: 20px; border-bottom: 1px solid var(--binding); }
.masthead-brand { font: 550 1.375rem 'Literata', Georgia, serif; color: var(--heading); text-decoration: none; }
.masthead-caption { color: var(--muted); font-size: .8125rem; }
.masthead-season { font-size: .8125rem; color: var(--primary); }
.sidebar { inset-block: 24px; padding: 8px 16px 0 22px; }
.sidebar::after { right: -2px; width: 6px; border-color: #b8a8c1; background: linear-gradient(#ded3e9, #cdbfd8, #ded3e9); }
.brand { padding-inline: 6px; }
.brand a { color: var(--heading); font-weight: 550; font-size: 1.25rem; }
.brand-kicker { font-size: .6875rem; gap: 8px; }
.brand-kicker img { width: 25px; }
.brand-caption { font-size: .75rem; }
.season-label { display: flex; justify-content: space-between; gap: 12px; font-size: .6875rem; border-top-color: var(--line); }
.season-label > span { font-size: .6875rem; }
.main-nav { padding-right: 14px; }
.main-nav a { font-size: .875rem; padding-left: 9px; gap: 9px; }
.main-nav a:hover { color: var(--heading); background-color: var(--primary-soft); }
.main-nav a.active { background-color: #993e53; background-image: repeating-linear-gradient(0deg, #ffffff05 0, #ffffff05 1px, transparent 1px, transparent 3px); box-shadow: inset 0 2px 0 #bd778660, inset 0 -2px 0 #6c273d30, 0 3px 5px #7c304318; color: #fff; }
.main-nav a.active::after { right: -13px; width: 14px; clip-path: polygon(0 0,100% 0,42% 50%,100% 100%,0 100%); }
.nav-number { color: #285a8b; width: 20px; }
.nav-divider { font-size: .6875rem; padding-top: 8px; margin-top: 10px; border-top: 1px solid var(--line); }
.sidebar-footer { border-top-color: var(--line); font-size: .8125rem; }
.sidebar-footer strong { font-weight: 500; }
.page-colophon { margin-top: 36px; padding-top: 16px; border-top: 1px solid #d8c59d; font-size: .6875rem; }
.page-colophon::after { content: ''; position: absolute; width: 100px; height: 24px; left: calc(50% - 50px); top: 12px; background: url("../images/floral-rule.b743a0f1f262.svg") center / contain no-repeat; }
.mobile-location, .nav-backdrop { display: none; }
.page-header { padding-bottom: 22px; margin-bottom: 24px; }
.page-header .eyebrow { margin-bottom: 8px; }
.page-header .lead { font-size: .9375rem; }
.page-header h1 { margin-bottom: 8px; }

/* The home page is a continuous book spread; marginalia do not compete with lessons. */
.notebook-welcome { display: flex; justify-content: space-between; align-items: center; gap: 24px; margin-bottom: 28px; }
.notebook-welcome h1 { font-size: 1.75rem; margin: 0; }
.notebook-welcome .eyebrow { font-size: .75rem; margin-bottom: 8px; }
.notebook-welcome > .button { flex-shrink: 0; font-size: .8125rem; }
.home-spread { display: grid; grid-template-columns: minmax(0, 1fr) 192px; gap: 40px; }
.home-main-column { min-width: 0; }
.current-lesson { padding: 23px 0 28px; border-top: 2px solid var(--primary); border-bottom: 1px solid var(--line); }
.chapter-kicker { display: flex; align-items: baseline; flex-wrap: wrap; justify-content: space-between; gap: 8px; margin-bottom: 14px; color: var(--berry); font-size: .8125rem; }
.chapter-kicker time { color: var(--muted); font-size: .8125rem; }
.current-lesson h2 { font-size: 1.75rem; line-height: 1.4; margin: 0 0 14px; }
.current-lesson > p { font-size: .9375rem; line-height: 1.65; color: var(--muted); max-width: 60ch; margin-bottom: 22px; }
.current-lesson-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 20px; }
.lesson-footnote { font-size: .8125rem; color: var(--muted); }
.home-margin { min-width: 0; align-self: start; padding-top: 6px; }
.margin-portal { display: block; width: 170px; height: 270px; object-fit: contain; margin: -6px auto 20px; pointer-events: none; }
.margin-teapot { display: block; width: 192px; height: 156px; object-fit: contain; margin: 0 auto 20px; pointer-events: none; }
.margin-note { padding-left: 16px; border-left: 1px solid var(--binding); }
.margin-note .eyebrow { font-size: .75rem; }
.margin-note p { color: var(--muted); font-size: .8125rem; line-height: 1.65; margin: 12px 0; }
.margin-note a, .margin-contact { font-size: .75rem; line-height: 1.6; }
.margin-metric { display: flex; align-items: baseline; gap: 9px; }
.margin-metric strong { font: 500 2.25rem/1 'Literata', Georgia, serif; color: var(--primary); }
.margin-metric span { font-size: .75rem; color: var(--muted); }
.margin-contact { display: block; margin: 22px 0 0 16px; }
.home-materials { margin-top: 28px; }
.chapter-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 22px; }
.chapter-heading h2 { font-size: 1.375rem; margin: 0; }
.chapter-heading > a { color: var(--link); font-size: .8125rem; white-space: nowrap; }
.bookshelf { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 26px; row-gap: 28px; }
.bookshelf-item { display: flex; align-items: flex-start; gap: 18px; min-width: 0; color: var(--text); text-decoration: none; }
.bookshelf-item:hover .bookshelf-copy > strong, .bookshelf-item:hover .book-open { color: var(--link); text-decoration: underline; text-underline-offset: 4px; }
.bookshelf-copy { display: flex; flex-direction: column; min-width: 0; gap: 7px; padding: 3px 0; }
.bookshelf-copy > strong { font: 550 1rem/1.45 'Literata', Georgia, serif; color: var(--heading); overflow-wrap: anywhere; }
.bookshelf-copy > span { font-size: .75rem; }
.bookshelf-copy > small { font-size: .6875rem; color: var(--muted); }
.bookshelf-copy .book-open { font-size: .75rem; color: var(--link); margin-top: 5px; }
.sheet-cover { --cover-color: #315f79; position: relative; width: 84px; height: 124px; flex-shrink: 0; display: flex; align-items: center; flex-direction: column; padding: 10px 9px 11px 13px; color: #fff; background-color: var(--cover-color); background-image: repeating-linear-gradient(94deg, #ffffff05 0, #ffffff05 1px, transparent 1px, transparent 3px); border-radius: 2px 5px 5px 2px; border: 1px solid #34313b30; border-left: 6px solid #203e59; box-shadow: inset 2px 0 3px #ffffff25, 2px 1px 0 #f4f0e1, 3px 2px 0 #c9cbbd, 5px 4px 7px #34313b17; }
.sheet-cover::after { content: ''; position: absolute; inset: 5px 4px 5px 5px; border: 1px solid #ead8a966; border-radius: 1px; pointer-events: none; }
.cover-imprint { font: 400 .5625rem 'Golos', sans-serif; color: #fff; }
.cover-drawing { width: 56px; height: 51px; background: url("../images/cover-geometry.702a59c9d510.svg") center / contain no-repeat; flex-shrink: 0; margin: 1px 0; }
.cover-title { text-align: center; font: 500 .6875rem/1.4 'Literata', Georgia, serif; overflow-wrap: anywhere; display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; overflow: hidden; max-height: 2.8em; }
.cover-rule { width: 22px; height: 1px; background: #ead8a9; margin-top: auto; }
.cover-1, .cover-4 { --cover-color: #65517b; border-left-color: #49365d; }
.cover-2, .cover-5 { --cover-color: #8a4359; border-left-color: #67283d; }
.cover-3 { --cover-color: #526782; border-left-color: #364d69; }
.home-news { margin-top: 34px; padding-top: 24px; border-top: 1px solid #d8c59d; }
.editorial-news { display: grid; grid-template-columns: 110px minmax(0,1fr) 24px; gap: 24px; padding: 16px 0; border-bottom: 1px solid var(--line); color: var(--text); text-decoration: none; }
.editorial-news:first-child { padding-top: 0; }
.editorial-news-date { font-size: .75rem; color: var(--muted); padding-top: 4px; }
.pinned-label { display: block; color: var(--berry); font-size: .6875rem; margin-top: 6px; }
.editorial-news strong { display: block; font: 550 1.125rem/1.5 'Literata', Georgia, serif; color: var(--heading); margin-bottom: 6px; }
.editorial-news .news-excerpt { display: block; max-width: 80ch; font-size: .875rem; }
.editorial-news:hover strong { text-decoration: underline; text-underline-offset: 4px; color: var(--link); }
.editorial-arrow { color: var(--link); padding-top: 4px; }

/* Lessons and worksheets read as chapters and printed sheets, not a calendar. */
.lesson-library { display: grid; gap: 30px; }
.lesson-chapter { display: grid; grid-template-columns: 76px minmax(0, 1fr); column-gap: 26px; padding: 0 0 28px; border-bottom: 1px solid var(--line); }
.lesson-chapter-index { padding-top: 2px; color: var(--berry); }
.lesson-chapter-index > span { display: block; font-size: .6875rem; color: var(--muted); }
.lesson-chapter-index > strong { font: 500 1.875rem/1.4 'Literata', Georgia, serif; }
.lesson-chapter-index > small { display: block; font-size: .6875rem; color: var(--muted); }
.lesson-chapter h2 { font-size: 1.375rem; margin: 0 0 10px; }
.lesson-chapter h2 a { color: var(--heading); text-decoration: none; }
.lesson-chapter h2 a:hover { color: var(--link); text-decoration: underline; }
.lesson-chapter p { color: var(--muted); font-size: .9375rem; }
.lesson-chapter .card-meta { justify-content: flex-start; margin-bottom: 10px; }
.sheet-links { display: flex; flex-wrap: wrap; gap: 12px 20px; }
.sheet-link { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; font-size: .8125rem; }
.sheet-link::before { content: ''; width: 13px; height: 18px; flex-shrink: 0; border: 1px solid #7e9da9; border-left: 3px solid var(--link); box-shadow: 2px 2px 0 var(--field-deep); }
.sheet-link small { color: var(--muted); font-size: .75rem; }
.worksheet-grid { grid-template-columns: 1fr; gap: 32px; }
.worksheet-document { scroll-margin-top: 28px; padding: 26px 28px; border: 1px solid var(--line); border-left: 5px solid var(--primary); border-radius: 3px 6px 6px 3px; box-shadow: 3px 3px 0 #f7f2ec, 4px 4px 0 var(--line); }
.worksheet-document:target { border-color: var(--link); outline: 2px solid #285a8b25; outline-offset: 3px; }
.worksheet-document-head { display: grid; grid-template-columns: 84px minmax(0,1fr); gap: 28px; }
.worksheet-document h2 { font-size: 1.5rem; margin: 0 0 10px; }
.worksheet-document p { color: var(--muted); font-size: .9375rem; line-height: 1.65; }
.worksheet-document .eyebrow { margin-bottom: 8px; }
.worksheet-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 20px; margin-top: 20px; }
.worksheet-actions > a:not(.button) { font-size: .8125rem; min-height: 44px; display: inline-flex; align-items: center; }
.worksheet-problems { padding-top: 24px; margin-top: 24px; border-top: 1px solid var(--line); }
.worksheet-problems h3 { font-family: 'Golos', sans-serif; font-size: .8125rem; font-weight: 500; margin-bottom: 14px; color: var(--muted); }
.printed-problems { display: flex; flex-wrap: wrap; gap: 8px; }
.printed-problem { display: flex; align-items: baseline; gap: 14px; min-width: 42px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 3px; font-size: .875rem; }
.printed-problem strong { color: var(--berry); font-weight: 550; }
.printed-problem.has-statement { width: 100%; border: 0; border-bottom: 1px solid var(--line); padding-block: 12px; line-height: 1.7; font-size: 1rem; }
.printed-problem.has-statement strong { min-width: 28px; }

/* Results retain a wide, undecorated working surface within the book. */
.results-toolbar { padding: 18px; border: 1px solid var(--line); background: var(--field); border-radius: 5px; margin-bottom: 20px; }
.results-primary-controls { display: flex; align-items: flex-end; flex-wrap: wrap; gap: 12px; }
.results-primary-controls label { flex: 1 1 300px; max-width: 520px; font-size: .8125rem; }
.results-advanced { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line); }
.results-advanced label { flex: 1 1 140px; font-size: .8125rem; }
.results-summary { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 18px; margin-bottom: 14px; font-size: .8125rem; }
.results-summary strong { font-weight: 550; color: var(--heading); }
.results-summary > div { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 18px; }
.results-summary span, .results-summary small { color: var(--muted); }
.results-summary small { flex-basis: 100%; }
.results-summary > a { margin-left: auto; }
.results-legend { display: flex; flex-wrap: wrap; gap: 12px 20px; align-items: center; padding: 12px 0; font-size: .75rem; color: var(--muted); }
.results-legend strong { color: var(--muted); }
.results-legend > span:first-child strong { color: var(--success); }
.results-scroll-hint { color: var(--muted); font-size: .75rem; margin-bottom: 12px; }
.results-table caption { padding: 10px 12px; text-align: left; background: var(--field); color: var(--muted); font-size: .75rem; }
.results-table thead tr:nth-child(2) th { top: var(--lesson-header-height, 45px); }
.results-table thead tr:nth-child(3) th { top: calc(var(--lesson-header-height, 45px) + var(--sheet-header-height, 45px)); }
.results-table .lesson-heading, .results-table .sheet-heading { font-weight: 550; font-family: 'Golos', sans-serif; }
.results-table .student-column { font-weight: 500; }
.results-table .total-column { min-width: 74px; font-size: .75rem; }
.results-table .sheet-tone-0 { --sheet-paper: #fbf5e8; --sheet-heading: #f4ead3; --sheet-hover: #f5eddb; }
.results-table .sheet-tone-1 { --sheet-paper: #f3edf9; --sheet-heading: #e9def3; --sheet-hover: #ece3f5; }
.results-table .sheet-tone-2 { --sheet-paper: #edf3fa; --sheet-heading: #dfe9f4; --sheet-hover: #e4edf7; }
.results-table .sheet-tone-3 { --sheet-paper: #fbf0f2; --sheet-heading: #f2dfe4; --sheet-hover: #f6e7ec; }
.results-table td[class*="sheet-tone-"] { background: var(--sheet-paper); }
.results-table th[class*="sheet-tone-"] { background: var(--sheet-heading); }
.results-table .sheet-start { border-left: 2px solid #b8abbe; }
.results-table .sheet-end { border-right: 2px solid #b8abbe; }
.results-table .sheet-heading a { display: flex; min-height: 44px; align-items: center; justify-content: center; color: var(--heading); text-underline-offset: 3px; }
.results-table .result-cell { color: var(--muted); }
.results-table .result-cell.solved { color: var(--success); }
.results-table tbody tr:hover td[class*="sheet-tone-"],
.results-table tbody tr:focus-within td[class*="sheet-tone-"] { background: var(--sheet-hover); }
.results-table tbody tr:hover .student-column { box-shadow: 2px 0 0 #b8abbe, inset 3px 0 0 var(--primary); }
.results-empty { padding: 24px; border: 1px dashed var(--control-border); }
.external-link-note { font-size: .75rem; font-weight: 400; }

/* One deliberate confirmation; cancel never changes a mark. */
.mark-dialog { position: fixed; inset: 0; margin: auto; width: min(480px, calc(100vw - 32px)); max-height: calc(100dvh - 48px); padding: 28px; border: 1px solid var(--binding); border-top: 4px solid var(--berry); border-radius: 7px; color: var(--text); background: #fff; box-shadow: 0 18px 80px #34324d40; }
.mark-dialog::backdrop { background: #34324d5c; }
.mark-dialog h2 { font-size: 1.5rem; margin-bottom: 12px; }
.mark-dialog p { font-size: .875rem; line-height: 1.6; }
.mark-dialog label { font-size: .875rem; font-weight: 500; }
.mark-dialog textarea { margin-top: 6px; min-height: 96px; }
.dialog-actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 10px; margin-top: 24px; }
.checking-status.warning { color: var(--warning); background: var(--warning-bg); }
.checking-summary h2 { color: #fff; }
.checking-summary { background: var(--primary); }
.checking-sheet { border-radius: 4px; border-top: 3px solid #b68b43; }
.checking-selectors { background: var(--field); }
.problem-button { box-shadow: 0 2px 0 var(--line); }
.problem-button.is-solved { box-shadow: inset 0 -2px 0 #163f36; }
.problem-button span { font-weight: 500; }
.problem-button:disabled { opacity: 1; cursor: wait; }
.checking-sheet[aria-busy='true'] .problem-button { cursor: wait; }
.auth-intro .auth-vignette { width: 254px; height: 250px; margin: 0 auto 12px; }
.auth-intro { padding-top: 38px; padding-bottom: 32px; }
.auth-intro h1 { margin-top: 24px; font-size: 2rem; color: var(--heading); }
.auth-shell::before { border-color: var(--binding); }
.auth-shell { background: var(--surface); border-color: #cebeac; box-shadow: 0 4px 0 -1px #fbf3e5, 0 5px 0 #c5b9a9, 0 8px 0 -1px #f6ead8, 0 9px 0 #bbac9d, 0 24px 70px #59416f1f, 0 0 70px #e9b86620; }
.auth-intro { background: #fcf5e9; border-radius: 7px 0 0 7px; }
.auth-intro .auth-vignette { filter: drop-shadow(0 9px 15px #b2834b1c); }
.auth-brand { color: var(--heading); }
.auth-card h2 { color: var(--heading); }
.post-card { box-shadow: none; border: 0; border-bottom: 1px solid var(--line); padding: 20px 0 24px; border-radius: 0; }
.post-card h2 { font-weight: 550; }

@media (min-width: 1024px) {
  .page-results .app-main { padding-inline: 32px; }
  .page-results .running-head { min-height: 72px; margin-bottom: 20px; }
  .page-results .page-header { padding-bottom: 16px; margin-bottom: 18px; }
  .results-toolbar { display: grid; grid-template-columns: minmax(190px, 1.65fr) minmax(140px, 1fr) minmax(180px, 1fr) auto; gap: 12px; padding: 14px; margin-bottom: 14px; align-items: end; }
  .results-primary-controls, .results-advanced { display: contents; }
  .results-primary-controls label { grid-column: 1; grid-row: 1; max-width: none; }
  .results-primary-controls button[type='submit'] { grid-column: 4; grid-row: 1; }
  .results-advanced label { min-width: 0; grid-row: 1; }
  .results-advanced label:nth-child(1) { grid-column: 2; }
  .results-advanced label:nth-child(2) { grid-column: 3; }
  .results-toolbar input, .results-toolbar select, .results-toolbar .button { font-size: .8125rem; }
  .results-summary { margin-bottom: 6px; }
  .results-legend { padding-block: 6px; }
  .results-scroll-hint { margin: 4px 0 10px; }
  .results-table caption { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
}

@media (min-width: 1024px) and (max-height: 850px) {
  .sidebar { inset-block: 16px; }
  .brand { padding-bottom: 12px; }
  .brand-kicker { margin-bottom: 8px; }
  .nav-divider { margin-top: 6px; padding-top: 4px; }
}
@media (min-width: 1024px) and (max-width: 1279px) {
  :root { --sidebar: 220px; }
  .app-main { padding-inline: 36px; margin-right: 16px; }
  .home-spread { grid-template-columns: minmax(0,1fr) 160px; gap: 24px; }
  .margin-portal { width: 150px; height: 238px; }
  .bookshelf { grid-template-columns: 1fr; }
}
@media (max-width: 1023px) {
  .app-main { margin: 0 16px 24px; padding-inline: 36px; }
  .mobile-header { min-height: 66px; border-bottom: 0; background: var(--surround); }
  .mobile-brand { color: var(--heading); }
  .mobile-location { display: flex; justify-content: space-between; gap: 12px; margin: 0 24px; min-height: 40px; font-size: .6875rem; color: var(--muted); }
  .mobile-location > span:first-child { color: #fff; background: var(--berry); padding: 5px 13px 9px; margin-bottom: 8px; position: relative; }
  .mobile-location > span:first-child::after { content: ''; position: absolute; bottom: -5px; left: 0; height: 5px; width: 100%; background: var(--berry); clip-path: polygon(0 0,100% 0,100% 100%,50% 0,0 100%); }
  .mobile-location > span:last-child { padding-top: 5px; }
  .sidebar { inset: 66px auto 0 0; width: min(316px, 88vw); padding: 18px 20px; background: var(--field); z-index: 40; transition: transform .18s ease; }
  .sidebar::after { right: 0; }
  .nav-backdrop:not([hidden]) { display: block; position: fixed; inset: 66px 0 0; z-index: 35; padding: 0; background: #34324d50; border: 0; }
  .nav-open { overflow: hidden; }
  .mobile-header { z-index: 45; }
  .running-head { min-height: 68px; margin-bottom: 24px; }
  .home-spread { grid-template-columns: minmax(0,1fr) 166px; gap: 28px; }
  .margin-portal { width: 156px; height: 250px; }
  .bookshelf { grid-template-columns: 1fr; }
  .notebook-welcome h1 { font-size: 1.625rem; }
  .notebook-welcome .button { font-size: .75rem; padding-inline: 12px; }
}
@media (max-width: 767px) {
  .app-main { margin: 0 8px 24px; padding: 22px 18px 26px; }
  .app-main::before { inset: 7px; }
  .paper-corner { width: 76px; height: 76px; top: 0; }
  .paper-corner-start { left: 0; }
  .paper-corner-end { right: 0; }
  .running-head { display: none; }
  .mobile-header { padding-inline: 14px; min-height: 66px; }
  .mobile-brand { font-size: .9375rem; }
  .mobile-location { margin-inline: 18px; }
  .page-header, .notebook-welcome { margin-top: 10px; }
  .page-header h1 { font-size: 1.625rem; }
  .notebook-welcome { align-items: flex-start; flex-direction: column; gap: 16px; margin-bottom: 20px; }
  .notebook-welcome h1 { font-size: 1.625rem; }
  .notebook-welcome > .button { width: 100%; min-height: 44px; font-size: .875rem; }
  .home-spread { display: flex; flex-direction: column; gap: 26px; }
  .current-lesson { padding: 18px 0 22px; }
  .current-lesson h2 { font-size: 1.5rem; margin-bottom: 12px; }
  .current-lesson > p { font-size: .875rem; margin-bottom: 18px; }
  .chapter-kicker { font-size: .75rem; gap: 8px; }
  .chapter-kicker time { font-size: .75rem; }
  .current-lesson-actions { gap: 12px; }
  .current-lesson-actions .button { flex: 1 1 100%; }
  .lesson-footnote { font-size: .75rem; }
  .chapter-heading { align-items: baseline; gap: 12px; margin-bottom: 20px; }
  .chapter-heading h2 { font-size: 1.25rem; }
  .chapter-heading > a { font-size: .75rem; }
  .home-materials { margin-top: 24px; }
  .bookshelf { grid-template-columns: 1fr; gap: 24px; }
  .bookshelf-item { gap: 20px; }
  .bookshelf-copy > strong { font-size: 1.0625rem; }
  .bookshelf-copy > span { font-size: .8125rem; }
  .bookshelf-copy > small, .bookshelf-copy .book-open { font-size: .75rem; }
  .margin-portal, .margin-teapot { display: none; }
  .home-margin { width: 100%; padding: 0; }
  .margin-note { border-left: 2px solid var(--binding); padding-left: 16px; }
  .margin-note p { margin: 8px 0; }
  .margin-note a, .margin-contact { font-size: .8125rem; }
  .margin-metric strong { font-size: 1.75rem; }
  .margin-contact { margin-top: 14px; }
  .home-news { margin-top: 26px; padding-top: 22px; }
  .editorial-news { grid-template-columns: 1fr 18px; gap: 6px 12px; padding: 18px 0; }
  .editorial-news-date { grid-column: 1 / -1; display: flex; gap: 12px; margin-bottom: 4px; }
  .pinned-label { margin: 0; }
  .editorial-news strong { font-size: 1.0625rem; }
  .editorial-news .news-excerpt { font-size: .8125rem; }
  .page-colophon { font-size: .625rem; margin-top: 28px; }
  .page-colophon::after { display: none; }
  .lesson-chapter { grid-template-columns: 45px minmax(0,1fr); gap: 16px; padding-bottom: 24px; }
  .lesson-chapter-index > strong { font-size: 1.5rem; }
  .lesson-chapter-index > small { font-size: .625rem; }
  .lesson-chapter h2 { font-size: 1.25rem; }
  .lesson-chapter p { font-size: .875rem; }
  .sheet-links { gap: 6px; flex-direction: column; }
  .sheet-link { font-size: .8125rem; }
  .worksheet-document { padding: 18px 16px; scroll-margin-top: 82px; }
  .worksheet-document-head { grid-template-columns: 70px minmax(0,1fr); gap: 18px; }
  .worksheet-document .sheet-cover { width: 70px; height: 108px; padding: 9px 6px 10px 8px; }
  .worksheet-document .cover-drawing { width: 45px; height: 40px; }
  .worksheet-document .cover-title { font-size: .625rem; }
  .worksheet-document h2 { font-size: 1.25rem; }
  .worksheet-document p { font-size: .8125rem; }
  .worksheet-actions { gap: 10px 16px; }
  .worksheet-actions .button { width: 100%; }
  .worksheet-problems { margin-top: 18px; padding-top: 18px; }
  .results-toolbar { padding: 12px; }
  .results-primary-controls { gap: 10px; }
  .results-primary-controls label { flex-basis: 100%; }
  .results-primary-controls .button { flex: 1 1 auto; font-size: .8125rem; }
  .results-advanced { gap: 12px; }
  .results-advanced label { flex: 1 1 100%; }
  .results-summary { font-size: .75rem; }
  .results-summary small { font-size: .6875rem; }
  .results-legend, .results-scroll-hint { font-size: .6875rem; }
  .results-table caption { padding: 8px; font-size: .6875rem; }
  .page-checking .page-header { margin-bottom: 16px; }
  .page-checking .checking-selectors { padding: 12px; }
  .page-checking .checking-summary { position: sticky; top: 66px; z-index: 3; }
  .checking-sheet { overflow: visible; }
  .checking-summary h2 { font-size: 1.25rem; }
  .problem-buttons { padding: 12px; gap: 10px; }
  .mark-dialog { padding: 22px; }
  .dialog-actions { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); }
  .dialog-actions .button { font-size: .8125rem; padding-inline: 10px; }
  .auth-intro .auth-vignette { display: none; }
  .auth-intro { padding-top: 30px; }
  .auth-intro h1 { font-size: 1.875rem; }
}
@media (prefers-reduced-motion: reduce) { .sidebar { transition: none; } }
@media print { .paper-corner, .home-margin, .mobile-location, .nav-backdrop { display: none !important; } .app-main::before, .page-colophon::after { display: none; } .app-main { box-shadow: none; } }