/* Layout and components. Colors and fonts come only from theme.css. */

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--color-page);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 1.125rem;
  line-height: 1.5;
}

a { color: var(--color-primary); }
a:hover { color: var(--color-primary-hover); }

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.site-header {
  padding: 0.75rem 16px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}
.site-title {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
  text-decoration: none;
}

main {
  max-width: 64rem;
  margin: 0 auto;
  padding: 1.25rem 16px 3rem;
}
main:focus { outline: none; }

h1 { font-size: 1.75rem; line-height: 1.25; margin: 0.25rem 0 1rem; }
h1:focus, h2:focus, li:focus { outline: none; }

.eyebrow {
  display: block;
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.back-link { display: inline-block; padding: 0.5rem 0; font-weight: 600; }

.breadcrumb { list-style: none; margin: 0; padding: 0.5rem 0; display: flex; flex-wrap: wrap; gap: 0.25rem 0.5rem; }
.breadcrumb li { display: flex; gap: 0.5rem; }
.breadcrumb li + li::before { content: '›'; color: var(--color-text-muted); }
.breadcrumb a { font-weight: 600; }
.breadcrumb [aria-current] { color: var(--color-text-muted); }

.notice {
  padding: 0.75rem 1rem;
  background: var(--color-hint-bg);
  border: 1px solid var(--color-hint-border);
  border-radius: var(--radius);
}

/* ---- Lists of classes and lessons ---- */

.card-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.75rem; }
.card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.35rem;
  padding: 1rem 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  text-decoration: none;
}
a.card:hover { border-color: var(--color-primary); color: var(--color-text); }
.card.is-disabled { opacity: 0.7; }
.card-kicker { font-size: 0.95rem; font-weight: 600; color: var(--color-text-muted); }
.card-title { font-size: 1.2rem; font-weight: 600; }
.card-note { color: var(--color-text-muted); }
.chapter-summary { font-weight: 600; }

.chip {
  display: inline-block;
  padding: 0.2rem 0.75rem;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 700;
}
.chip-not-yet { background: var(--color-not-yet-bg); color: var(--color-not-yet-text); }
.chip-getting-there { background: var(--color-getting-there-bg); color: var(--color-getting-there-text); }
.chip-got-it { background: var(--color-got-it-bg); color: var(--color-got-it-text); }

/* ---- Buttons ---- */

.btn {
  display: inline-block;
  min-height: 3rem;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius);
  border: 2px solid var(--color-primary);
  font: inherit;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}
.btn-primary { background: var(--color-primary); color: var(--color-on-primary); }
.btn-primary:hover { background: var(--color-primary-hover); border-color: var(--color-primary-hover); color: var(--color-on-primary); }
.btn-secondary { background: var(--color-surface); color: var(--color-primary); }
.btn-secondary:hover { background: var(--color-key); }

.btn-speak {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 0.25rem;
  padding: 0.35rem 0.8rem;
  min-height: 2.5rem;
  border: 1px solid var(--color-primary);
  border-radius: 999px;
  background: var(--color-surface);
  color: var(--color-primary);
  font: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}
.btn-speak:hover { background: var(--color-key); }

/* ---- Practice screen ---- */

.practice-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1rem;
}
.lesson-title { font-size: 1.3rem; }

.dots { display: flex; gap: 0.4rem; }
.dot {
  width: 0.8rem; height: 0.8rem;
  border-radius: 50%;
  background: var(--color-dot);
}
.dot.is-done { background: var(--color-dot-done); }
.dot.is-current { box-shadow: 0 0 0 2px var(--color-page), 0 0 0 4px var(--color-dot-done); }

.practice { display: grid; gap: 1.25rem; }
@media (min-width: 820px) {
  .practice { grid-template-columns: minmax(0, 1fr) 19rem; align-items: start; }
}

.work-area, .answer-area {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  min-width: 0;
}

.twin-note { margin: 0 0 0.5rem; font-weight: 700; font-size: 1.2rem; color: var(--color-primary); }

.problem-box { display: flex; justify-content: center; padding: 0.5rem 0 1rem; }

/* The column grid. Every row uses the same fixed column width, so digits line up
   even when a row (like the regrouped numbers) uses smaller print. */
.grid {
  --cell: 3.1rem;
  display: inline-block;
  font-family: var(--font-numbers);
  font-variant-numeric: tabular-nums;
  font-size: 3.2rem;
  font-weight: 600;
  line-height: 1.15;
}
.grid-small { --cell: 2.3rem; font-size: 2.3rem; }
.grid-row { display: grid; grid-template-columns: repeat(var(--cols), var(--cell)); }
.cell { position: relative; text-align: center; border-radius: 6px; }
.cell-op { font-weight: 500; }
/* The comma hangs in the gap after its digit, so it never takes a column. */
.comma { position: absolute; left: calc(50% + 0.3em); bottom: 0; }
.grid-carry { font-size: 0.45em; color: var(--color-carry, var(--color-primary)); min-height: 1.3em; }
.grid-carry .cell { line-height: 1.6; }
.grid-rule {
  height: 0;
  border-top: 0.07em solid var(--color-text);
  margin: 0.1em 0 0.12em;
}
/* A problem written on one line, e.g. "4 × 500 = ?" */
.line-problem {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: center;
  gap: 0 0.4em;
  font-family: var(--font-numbers);
  font-variant-numeric: tabular-nums;
  font-size: 3rem;
  font-weight: 600;
  line-height: 1.2;
}
.line-blank {
  min-width: 1.4em;
  border-bottom: 0.07em solid var(--color-text);
  color: var(--color-text-muted);
  text-align: center;
}
.steps .line-problem { font-size: 2.2rem; justify-content: flex-start; }
@media (max-width: 420px) {
  .line-problem { font-size: 2.3rem; }
  .steps .line-problem { font-size: 1.8rem; }
}
.partials li.is-current { background: var(--color-new-mark); font-weight: 700; border-radius: 6px; padding: 0 0.3rem; }

.cell.is-hidden { visibility: hidden; }
.cell.is-new { background: var(--color-new-mark); }

@media (max-width: 420px) {
  .grid { --cell: 2.6rem; font-size: 2.7rem; }
  .grid-small { --cell: 2rem; font-size: 2rem; }
}

/* Answer box and number pad */
.answer-label { display: block; font-weight: 700; margin-bottom: 0.35rem; }
.answer-input {
  width: 100%;
  padding: 0.4rem 0.75rem;
  font-family: var(--font-numbers);
  font-variant-numeric: tabular-nums;
  font-size: 2.2rem;
  font-weight: 600;
  text-align: right;
  color: var(--color-text);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
}
.answer-input:focus { border-color: var(--color-primary); outline: none; }

.keypad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  margin-top: 0.75rem;
}
.key {
  min-height: 3.6rem;
  border: none;
  border-radius: var(--radius);
  background: var(--color-key);
  color: var(--color-key-text);
  font: inherit;
  font-size: 1.6rem;
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
}
.key:hover { background: var(--color-key-hover); }
.key:active { transform: translateY(1px); }
.key-check { background: var(--color-primary); color: var(--color-on-primary); font-size: 1.25rem; }
.key-check:hover { background: var(--color-primary-hover); }

/* Messages */
.feedback:empty { display: none; }
.message {
  margin-top: 0.5rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  border: 1px solid;
}
.message p { margin: 0 0 0.6rem; }
.message-success { background: var(--color-success-bg); border-color: var(--color-success-border); }
.message-hint { background: var(--color-hint-bg); border-color: var(--color-hint-border); }
.message-big { font-size: 1.4rem; font-weight: 700; }
.hint-you-wrote { color: var(--color-note-text); }
.hint-text { font-size: 1.2rem; font-weight: 600; }
.note { margin: 0.5rem 0 0; color: var(--color-note-text); font-weight: 600; }
.celebrate { font-weight: 700; }
.choice-buttons { display: flex; flex-wrap: wrap; gap: 0.75rem; }

/* Worked steps */
.steps {
  margin-top: 1rem;
  padding: 1rem 1.25rem;
  background: var(--color-steps-bg);
  border: 1px solid var(--color-steps-border);
  border-radius: var(--radius);
}
.steps-heading { margin: 0 0 0.75rem; font-size: 1.25rem; }
.steps-layout { display: flex; flex-wrap: wrap; gap: 1rem 2rem; align-items: flex-start; }
.partials {
  flex: 1 1 14rem;
  padding: 0.75rem 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-steps-border);
  border-radius: var(--radius);
}
.partials h3 { margin: 0 0 0.4rem; font-size: 1rem; }
.partials ul { margin: 0 0 0.25rem; padding-left: 1.1rem; font-variant-numeric: tabular-nums; }
.step-list { margin: 1rem 0 0.75rem; padding-left: 1.5rem; }
.step-list li { margin-bottom: 0.75rem; }
.step-text { display: block; }
.step-actions { margin-top: 0.5rem; }

/* Test mode */
.test-panel {
  margin: 0 0 1rem;
  padding: 0.75rem 1rem;
  background: var(--color-test-bg);
  border: 1px dashed var(--color-test-border);
  border-radius: var(--radius);
  font-size: 0.95rem;
}
.test-title { margin: 0; font-weight: 700; }
.test-meta { margin: 0 0 0.5rem; color: var(--color-text-muted); }
.test-panel dl { display: grid; grid-template-columns: max-content 1fr; gap: 0.15rem 1rem; margin: 0; }
.test-panel dt { font-family: ui-monospace, Consolas, monospace; }
.test-panel dd { margin: 0; font-weight: 700; font-variant-numeric: tabular-nums; }

/* End screen */
.end-card {
  max-width: 36rem;
  margin: 1rem auto;
  padding: 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}
.end-label { font-weight: 600; }
.end-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.25rem; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .key:active { transform: none; }
}

/* ---- Number pad: comma key, Check across the bottom ---- */
.key-comma { font-size: 1.9rem; line-height: 1; }
.keypad .key-check { grid-column: 1 / -1; min-height: 3.2rem; }

/* Sentence-frame answers: "There are [   ] seats." */
.frame { font-size: 1.25rem; line-height: 2.2; margin: 0 0 0.25rem; }
.answer-input.answer-inline {
  display: inline-block;
  margin: 0 0.3em;
  padding: 0.15rem 0.5rem;
  font-size: 1.6rem;
  vertical-align: middle;
}
.comma-note { color: var(--color-note-text); font-weight: 600; }

/* ---- Small top-bar buttons (Take a break, test tools) ---- */
.top-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem 0.75rem; }
.btn-small {
  min-height: 2.5rem;
  padding: 0.3rem 0.8rem;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-surface);
  color: var(--color-text-muted);
  font: inherit;
  font-size: 0.95rem;
  cursor: pointer;
}
.btn-small:hover { border-color: var(--color-primary); color: var(--color-primary); }

.nudge p { margin: 0 0 0.6rem; font-weight: 600; }
.confirm-text { flex-basis: 100%; margin: 0; font-weight: 600; }
.section-heading { font-size: 1.25rem; margin: 1.75rem 0 0.75rem; }

/* Chapter review card on the lesson list */
.review-pick { display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem; margin-top: 0.35rem; }
.review-select {
  min-height: 2.75rem;
  padding: 0.3rem 0.6rem;
  font: inherit;
  border: 2px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-surface);
  color: var(--color-text);
}

/* Review plan */
.plan-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.6rem; }
.plan-item {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.5rem 1rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}
.plan-title { display: block; font-weight: 600; margin-top: 0.2rem; }
.got-list .plan-item { justify-content: flex-start; background: var(--color-success-bg); border-color: var(--color-success-border); }
.got-list .plan-title { flex-basis: 100%; }

/* ---- Word problems and the marking toolbar ---- */
.marking { width: 100%; }
.problem-box .marking { text-align: left; }
.problem-box:has(.marking) { display: block; }
.mark-toolbar { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 0.5rem; }
.tool-gap { flex: 0 0 0.5rem; }
.tool-btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  min-height: 2.75rem;
  padding: 0.3rem 0.7rem;
  border: 2px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-surface);
  color: var(--color-text);
  font: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  touch-action: manipulation;
}
.tool-btn:hover { border-color: var(--color-primary); }
.tool-btn[aria-pressed="true"] { border-color: var(--color-primary); background: var(--color-key); box-shadow: inset 0 0 0 1px var(--color-primary); }
.tool-btn:disabled { opacity: 0.5; cursor: default; }
.tool-btn .seg { line-height: 1.6; font-weight: 400; }
.tool-edit { font-weight: 500; color: var(--color-text-muted); }
.mark-note { min-height: 1.4em; margin: 0.25rem 0 0; color: var(--color-note-text); font-weight: 600; }
.mark-note:empty { min-height: 0; }

.passage {
  font-size: 1.35rem;
  line-height: 2.4;
  padding: 0.25rem 0.1rem;
  overflow-wrap: anywhere;
}
.passage.has-tool { touch-action: none; -webkit-user-select: none; user-select: none; cursor: pointer; }
.seg {
  padding: 0.22em 0;
  border: 0 solid var(--color-mark-box);
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}
.seg-in {
  padding: 0.08em 0;
  border: 0 solid var(--color-mark-circle);
  background-repeat: no-repeat;
  background-image: linear-gradient(var(--color-mark-underline), var(--color-mark-underline)), linear-gradient(var(--color-mark-cross), var(--color-mark-cross));
  background-size: 100% var(--u, 0px), 100% var(--x, 0px);
  background-position: 0 100%, 0 56%;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}
.word { border-radius: 4px; }
.word:focus { outline: 3px solid var(--color-focus); outline-offset: 1px; }
.is-sel > .seg-in { background-color: var(--color-mark-select); }
.m-underline > .seg-in { --u: 3px; }
.m-cross > .seg-in { --x: 3px; }
/* Word gaps are a little wider than a space, so circles and boxes can reach into them
   (negative margins) without pushing any words sideways. Marking never moves the text. */
.gap > .seg-in { padding-left: 0.17em; padding-right: 0.17em; }
.passage { padding-left: 0.4em; padding-right: 0.4em; }
.m-circle > .seg-in { border-top-width: 2px; border-bottom-width: 2px; }
.m-circle-s > .seg-in { border-left-width: 2px; border-top-left-radius: 0.9em; border-bottom-left-radius: 0.9em; padding-left: 0.14em; margin-left: calc(-0.14em - 2px); }
.m-circle-e > .seg-in { border-right-width: 2px; border-top-right-radius: 0.9em; border-bottom-right-radius: 0.9em; padding-right: 0.14em; margin-right: calc(-0.14em - 2px); }
.m-box { border-top-width: 2px; border-bottom-width: 2px; }
.m-box-s { border-left-width: 2px; padding-left: 0.2em; margin-left: calc(-0.2em - 2px); }
.m-box-e { border-right-width: 2px; padding-right: 0.2em; margin-right: calc(-0.2em - 2px); }
.word-tools { margin-top: 0.25rem; }
.solve-block { margin-top: 0.5rem; }
.solve-steps { margin: 0.5rem 0 0; padding-left: 1.1rem; font-size: 1rem; }

/* ---- Concept questions ---- */
.problem-box:has(.concept) { display: block; }
.concept-kicker { margin: 0 0 0.25rem; font-weight: 700; color: var(--color-primary); }
.choices { border: 0; margin: 0; padding: 0; min-width: 0; }
.concept-prompt { font-size: 1.3rem; font-weight: 700; margin-bottom: 0.75rem; padding: 0; }
.choice {
  display: flex; align-items: center; gap: 0.75rem;
  min-height: 3.4rem;
  margin-bottom: 0.65rem;
  padding: 0.7rem 1rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  cursor: pointer;
  font-size: 1.15rem;
}
.choice input { width: 1.3rem; height: 1.3rem; flex: none; accent-color: var(--color-primary); }
.choice:hover { border-color: var(--color-primary); }
.choice:has(input:checked) { border-color: var(--color-primary); background: var(--color-hint-bg); }
.choice:has(input:disabled) { cursor: default; }
.choice.is-correct { border-color: var(--color-success-border); background: var(--color-success-bg); font-weight: 700; }
.concept-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 0.75rem; margin-top: 0.5rem; }
.test-tag { font-size: 0.9rem; color: var(--color-text-muted); font-weight: 700; }
.tool-btn .seg { margin: 0 0.3em; }
.plan-item > div { flex: 1 1 14rem; }
@media (max-width: 420px) {
  .mark-toolbar { gap: 0.3rem; }
  .tool-btn { padding: 0.25rem 0.45rem; font-size: 0.88rem; gap: 0.25rem; }
  .tool-btn .seg { margin: 0 0.15em; }
  .tool-gap { display: none; }
  .passage { font-size: 1.2rem; line-height: 2.25; }
}

/* ---- Fill-in boxes ---- */
.problem-box:has(.box-wrap) { display: block; }
.box-problem { font-size: 1.35rem; line-height: 2.4; }
.box-intro { margin: 0 0 0.4rem; font-weight: 600; line-height: 1.4; }
.box-line { margin: 0; font-variant-numeric: tabular-nums; }
.fill-box {
  display: inline-block;
  box-sizing: content-box;
  min-height: 1.4em;
  margin: 0 0.15em;
  padding: 0.05em 0.3em;
  border: 2px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  color: var(--color-text);
  font: inherit;
  font-weight: 700;
  text-align: center;
  line-height: 1.4;
  vertical-align: middle;
}
input.fill-box { box-sizing: border-box; }
.fill-box.is-current { border-color: var(--color-primary); box-shadow: 0 0 0 2px var(--color-primary); outline: none; }
.fill-box.is-hint { border-color: var(--color-mark-box); background: var(--color-new-mark); border-width: 3px; }
.fill-box { max-width: 100%; }
.fill-box.mirror { background: var(--color-key); border-style: dashed; color: var(--color-text-muted); }
.fill-box.is-done { border-color: var(--color-success-border); background: var(--color-success-bg); }
.fill-box:disabled { opacity: 1; color: var(--color-text); }
.yesno { border: 0; margin: 0.5rem 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.6rem; align-items: center; }
.yesno legend { font-weight: 600; margin-bottom: 0.4rem; padding: 0; font-size: 1.1rem; line-height: 1.4; }
.yesno .choice { margin: 0; min-width: 6.5rem; min-height: 3rem; }
.yesno.is-hint .choice { border-color: var(--color-mark-box); background: var(--color-new-mark); }
.answer-area .box-problem { font-size: 1.25rem; margin-bottom: 0.25rem; }
.keypad.has-next .key-check { grid-column: span 2; }
.keypad.has-next .key-next { font-size: 1.05rem; }
.key-check.is-dimmed { opacity: 0.45; }
@media (max-width: 420px) {
  .box-problem { font-size: 1.2rem; }
}

/* ---- Multiple choice in lesson practice ---- */
.choice-text.math { font-family: var(--font-numbers); font-variant-numeric: tabular-nums; white-space: nowrap; }
.choice.is-hint { border-color: var(--color-mark-box); background: var(--color-new-mark); }
.pick-count { margin: 0 0 0.25rem; color: var(--color-text-muted); font-weight: 600; }
.concept-actions .btn.is-dimmed { opacity: 0.45; }

/* ---- Vertical fill-in boxes (partial products) ---- */
.vstack {
  display: inline-grid;
  grid-template-columns: auto auto;
  column-gap: 0.75rem;
  row-gap: 0.25rem;
  align-items: center;
  font-variant-numeric: tabular-nums;
}
.vnum, .vcell { justify-self: end; text-align: right; }
/* Same right edge as the digits inside the boxes (box padding + border). */
.vnum { font-weight: 700; padding-right: calc(0.3em + 2px); }
.box-problem.is-vertical { line-height: 1.5; }
.box-problem.is-vertical .fill-box { line-height: 1.4; }
.vcell .fill-box { text-align: right; margin: 0; }
.vrule { justify-self: stretch; border-top: 2px solid var(--color-text); height: 0; margin: 0.15rem 0; }
.vlabel { color: var(--color-text-muted); font-size: 0.85em; }

/* ---- Drawings (rectangle) ---- */
.figure { display: block; width: 100%; max-width: 20rem; height: auto; margin: 0.5rem 0; }
.figure-shape { fill: var(--color-key); stroke: var(--color-text); stroke-width: 2; }
.figure-label { fill: var(--color-text); font-family: var(--font-body); font-size: 17px; font-weight: 700; }
.hint-figure { margin-top: 0.25rem; }
.step-list.plain-list { list-style: none; padding-left: 0; }

/* ---- "About this site" notice ---- */
.site-footer { margin-top: 2.5rem; text-align: center; }
.link-button {
  background: none; border: none; padding: 0.5rem; min-height: 2.5rem;
  color: var(--color-primary); font: inherit; font-size: 0.95rem; text-decoration: underline; cursor: pointer;
}
.link-button:hover { color: var(--color-primary-hover); }
.about-dialog {
  width: min(34rem, calc(100vw - 32px));
  max-height: calc(100dvh - 32px);
  margin: auto;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-text);
  overflow: auto;
}
.about-dialog::backdrop { background: rgba(20, 30, 38, 0.55); }
.about-card { padding: 1.25rem 1.25rem 1rem; font-size: 1.05rem; line-height: 1.5; }
.about-card h2 { margin: 0 0 0.6rem; font-size: 1.35rem; }
.about-card p { margin: 0 0 0.75rem; }
.about-points { margin: 0 0 0.75rem; padding-left: 1.2rem; }
.about-points li { margin-bottom: 0.5rem; }
.about-trademark { color: var(--color-text-muted); font-size: 0.92rem; }
.about-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 0.75rem; }