@font-face { font-family: Manrope; src: url('/fonts/Manrope.ttf') format('truetype'); font-style: normal; font-weight: 200 800; font-display: swap; }
/* Search engines and no-JavaScript visitors get readable content before Vue mounts. */
.seo-fallback-header { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; padding: 18px max(20px, calc((100vw - 1200px) / 2)); border-bottom: 1px solid var(--td-color-border); background: var(--td-color-surface); }
.seo-fallback-header > a { color: var(--td-color-text); font-size: 1.25rem; font-weight: 800; text-decoration: none; }
.seo-fallback-header nav { display: flex; flex-wrap: wrap; gap: 10px 20px; font-size: .875rem; }
.seo-reading { max-width: 1200px; margin-inline: auto; line-height: 1.7; }
#seo-initial-page .seo-reading { min-height: 65vh; padding: 24px; }
@media (max-width: 600px) { #seo-initial-page .seo-reading { padding: 20px; } }

@scope (.seo-reading) to (.sc-page) {
* { box-sizing: border-box; }
a { color: var(--td-color-primary); text-underline-offset: .2em; overflow-wrap: anywhere; }
a:focus-visible { outline: 3px solid var(--td-color-focus); outline-offset: 4px; }
nav { display: flex; flex-wrap: wrap; gap: 12px 24px; }
h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); line-height: 1.3; max-width: 1000px; letter-spacing: -.035em; text-wrap: balance; }
h2 { font-size: 1.35rem; line-height: 1.4; }
h3 { font-size: 1.05rem; line-height: 1.5; margin-top: 0; }
section { margin: 28px 0; }
.intro { max-width: 850px; font-size: 1.1rem; color: var(--td-color-text-secondary); }
.eyebrow { color: var(--td-color-primary); font-size: .8rem; font-weight: 700; letter-spacing: .12em; margin-top: 40px; }
.breadcrumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; padding: 0; font-size: .85rem; }
.breadcrumbs li + li::before { content: '›'; margin-right: 8px; }
.chips { margin: 16px 0; gap: 8px; }
.chips a { border: 1px solid var(--td-color-border); border-radius: 8px; padding: 7px 12px; text-decoration: none; }
.chips a[aria-current] { background: var(--td-color-primary-soft); }
.chips .chip-unavailable { display: inline-flex; align-items: center; flex-wrap: wrap; gap: 6px; border: 1px solid var(--td-color-border); border-radius: 8px; padding: 7px 12px; color: var(--td-color-text-secondary); }
.chip-unavailable small { font-size: .75rem; }
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr)); gap: 16px; }
.card, .note { border: 1px solid var(--td-color-border); border-radius: var(--td-radius-xl); padding: 24px; background: var(--td-color-surface); min-width: 0; }
.exam-card { border: 1px solid var(--td-color-border); border-radius: var(--td-radius-xl); padding: 24px; background: var(--td-color-surface); min-width: 0; }
.exam-card strong { color: var(--td-color-primary); font-size: .9rem; }
.formula { padding: 16px; background: var(--td-color-primary-soft); color: var(--td-color-on-primary-soft); border-radius: 8px; font-size: 1.2rem; overflow-wrap: anywhere; white-space: pre-wrap; }
.muted { color: var(--td-color-text-secondary); font-size: .9rem; }
.button { display: inline-block; padding: 10px 18px; border-radius: 8px; background: var(--td-color-primary); color: var(--td-color-on-primary); font-weight: 600; text-decoration: none; }
.pagination { justify-content: center; padding: 24px; }
.preserve-lines { white-space: pre-line; }
dt { font-weight: bold; } dd { margin: 0 0 16px 24px; }
.conversion-form { display: grid; gap: 10px; max-width: 560px; }
.conversion-form label { font-weight: 600; }
.conversion-form input { width: 100%; border: 1px solid var(--td-color-border); border-radius: 8px; padding: 12px; background: var(--td-color-canvas); color: var(--td-color-text); font: inherit; }
.conversion-form p { margin: 0; font-size: .9rem; color: var(--td-color-text-secondary); }
.conversion-form button { justify-self: start; border: 0; font: inherit; cursor: pointer; }
.conversion-form :focus-visible { outline: 3px solid var(--td-color-focus); outline-offset: 3px; }
.conversion-result { font-size: 1.4rem; font-weight: 700; overflow-wrap: anywhere; }
.table-scroll { overflow-x: auto; }
.calculator-fallback-image { display: block; width: min(100%, 420px); height: auto; margin: auto; }
#public-calculator { min-width: 0; }
#public-calculator section { margin-block: 0; }
#public-calculator button, #public-calculator input, #public-calculator select { font-family: inherit; }
#public-calculator button { cursor: pointer; }
#public-calculator :focus-visible { outline: 3px solid var(--td-color-focus); outline-offset: 3px; }
#public-calculator h2, #public-calculator p { margin: 0; }
.calculator-introduction { border-top: 1px solid var(--td-color-border); padding-top: 16px; }
.calculator-introduction h1 { margin: 0 0 8px; font-size: 1.125rem; letter-spacing: normal; }
.calculator-introduction p { margin: 6px 0; font-size: .875rem; color: var(--td-color-text-secondary); }
.calculator-guide { margin: 16px 0; padding: 12px 16px; border: 1px solid var(--td-color-border); border-radius: 12px; font-size: .875rem; }
.calculator-guide summary { min-height: 24px; cursor: pointer; font-weight: 700; }
.calculator-guide summary:focus-visible { outline: 2px solid var(--td-color-focus); outline-offset: 4px; }
.calculator-landing-hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(230px, 360px); gap: clamp(20px, 4vw, 48px); align-items: start; }
.calculator-landing-hero .card { margin-top: 0; }
.calculator-preview { margin: 0; max-width: 360px; }
.calculator-preview img { display: block; width: 100%; height: auto; border: 1px solid var(--td-color-border); border-radius: var(--td-radius-xl); }
.calculator-preview figcaption { margin-top: 8px; color: var(--td-color-text-secondary); font-size: .875rem; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 10px 16px; border: 1px solid var(--td-color-border); text-align: left; }
caption { text-align: left; font-weight: 600; margin-bottom: 8px; }
@media (max-width: 600px) { .calculator-landing-hero { grid-template-columns: minmax(0, 1fr); } .calculator-preview { margin-inline: auto; } }

/* OpenDesign paper reading layout; semantic colors remain independent of accent. */
.notation-token { font-weight: 750; }
.notation-subject, .notation-variable { color: var(--td-color-notation-subject); }
.notation-auxiliary, .notation-number { color: var(--td-color-notation-auxiliary); }
.notation-verb { color: var(--td-color-notation-verb); }
.notation-progressive { color: var(--td-color-notation-progressive); }
.notation-participle, .notation-power { color: var(--td-color-notation-participle); }
.notation-past { color: var(--td-color-notation-past); }
.notation-negative { color: var(--td-color-notation-negative); }
.notation-object { color: var(--td-color-text); }

.notation-subject { font-weight: 900; }
.notation-legend { display: grid; grid-template-columns: max-content minmax(0, 1fr); align-items: center; gap: 6px 20px; padding: 7px 0; margin-block: 18px; border-block: 1px solid var(--td-color-border); }
.notation-legend > strong { align-self: start; font-size: .75rem; line-height: 1.55; }
.notation-legend ul { display: flex; flex-wrap: wrap; gap: 6px 10px; list-style: none; padding: 0; margin: 0; }
.notation-legend li { display: flex; align-items: baseline; gap: 5px; font-size: .75rem; }
.notation-legend p { grid-column: 2; margin: 0; color: var(--td-color-text-secondary); font-size: .75rem; line-height: 1.5; }
.notation-time-group { font-size: .75rem; font-weight: 700; color: var(--td-color-text-secondary); }
.card-grid.english-formula-grid { grid-template-columns: minmax(0, 1fr); gap: 24px; align-items: start; }
.english-formula-grid .card { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: 32px; padding: 28px 32px; border: 1px solid var(--td-color-border); border-radius: 12px; background: var(--td-color-surface); }
.english-lesson-content { min-width: 0; padding-left: 32px; border-left: 1px solid var(--td-color-border); }
.english-formula-grid .card h2 { font-size: 1.375rem; margin-block: 12px 8px; text-wrap: balance; }
.english-formula-grid .card h2 a { text-decoration: none; color: var(--td-color-text); }
.english-formula-grid .card h2 a:hover { text-decoration: underline; }
.english-formula-rows { margin: 0; }
.english-formula-rows > div { display: grid; grid-template-columns: 82px minmax(0, 1fr); gap: 12px; align-items: baseline; padding: 10px 0; }
.english-formula-rows > .english-form-row--main { padding: 0 0 20px; margin-bottom: 10px; border-bottom: 1px solid var(--td-color-border); }
.english-formula-rows dt { font-size: .75rem; font-weight: 500; color: var(--td-color-text-secondary); }
.english-formula-grid .card .formula, .english-formula-lesson .formula { margin: 0; min-width: 0; padding: 0; border: 0; border-radius: 0; background: transparent; color: var(--td-color-text); font-size: 1.125rem; line-height: 1.9; }
.formula-reading { overflow-wrap: anywhere; white-space: pre-wrap; }
.formula-reading--annotated { display: flex; flex-wrap: wrap; align-items: flex-start; gap: 6px 0; font-size: 1.5rem; line-height: 1.55; }
.formula-reading--annotated .notation-token { display: inline-flex; flex-direction: column; align-items: flex-start; padding-bottom: 4px; white-space: nowrap; }
.formula-reading--annotated .notation-token[data-label]::after { content: attr(data-label); display: block; border-top: 2px solid currentColor; padding-top: 5px; margin-top: 3px; max-width: 9em; font-size: .6875rem; font-weight: 500; line-height: 1.4; white-space: normal; }
.formula-reading--annotated .notation-plain { padding-inline: 3px; color: var(--td-color-text-secondary); }
.notation-example { margin-top: 18px; border-top: 1px solid var(--td-color-border); padding-top: 16px; }
.notation-example > strong { font-size: .75rem; font-weight: 500; color: var(--td-color-text-secondary); }
.notation-example p[lang="en"] { font-size: 1rem; line-height: 1.85; margin-block: 8px; }
.notation-example .muted { margin-block: 5px 0; font-size: .8125rem; }
.math-legend { display: flex; flex-wrap: wrap; gap: 12px 24px; font-size: .875rem; color: var(--td-color-text-secondary); }
.card .formula.math-formula, .formula.math-formula { font-size: 1.25rem; line-height: 1.9; background: var(--td-color-surface-muted); color: var(--td-color-text); }
@media (max-width: 850px) {
  .english-formula-grid .card { grid-template-columns: minmax(0, 1fr); gap: 24px; padding: 24px; }
  .english-lesson-content { border: 0; padding: 0; }
}
@media (max-width: 600px) {
  .english-formula-grid .card { padding: 20px; }
  .english-formula-rows > div { grid-template-columns: minmax(0, 1fr); gap: 4px; }
  .formula-reading--annotated { font-size: 1.375rem; }
  .formula-reading--annotated .notation-token[data-label]::after { max-width: 7em; }
  .notation-legend { grid-template-columns: minmax(0, 1fr); gap: 10px; }
  .notation-legend ul { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 9rem), 1fr)); gap: 16px; }
  .notation-legend li { flex-direction: column; gap: 4px; }
  .notation-legend p { grid-column: 1; }
}
}

html[data-design="studio"] .seo-reading h1 { font-size: clamp(2rem, 4vw, 3rem); letter-spacing: -.05em; }
html[data-design="studio"] .seo-reading .card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
html[data-design="studio"] .seo-reading .chips a[aria-current] { background: var(--td-color-primary); color: var(--td-color-on-primary); }
@media (max-width: 700px) { html[data-design="studio"] .seo-reading .card-grid { grid-template-columns: minmax(0, 1fr); } }