/* Rungs stylesheet — built 2026-10-13. Source files: fonts.css, tokens.css, site.css, components.css. */
/* --- fonts.css --- */
@font-face {
font-family: 'Bricolage Grotesque';
font-style: normal;
font-weight: 200 800;
font-stretch: 75% 100%;
font-display: swap;
src: url('/assets/fonts/bricolage-grotesque-normal-latin-ext.woff2') format('woff2');
unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
font-family: 'Bricolage Grotesque';
font-style: normal;
font-weight: 200 800;
font-stretch: 75% 100%;
font-display: swap;
src: url('/assets/fonts/bricolage-grotesque-normal-latin.woff2') format('woff2');
unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
font-family: 'IBM Plex Sans';
font-style: italic;
font-weight: 400;
font-stretch: 100%;
font-display: swap;
src: url('/assets/fonts/ibm-plex-sans-italic-latin-ext.woff2') format('woff2');
unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
font-family: 'IBM Plex Sans';
font-style: italic;
font-weight: 400;
font-stretch: 100%;
font-display: swap;
src: url('/assets/fonts/ibm-plex-sans-italic-latin.woff2') format('woff2');
unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
font-family: 'IBM Plex Sans';
font-style: normal;
font-weight: 400 700;
font-stretch: 100%;
font-display: swap;
src: url('/assets/fonts/ibm-plex-sans-normal-latin-ext.woff2') format('woff2');
unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
font-family: 'IBM Plex Sans';
font-style: normal;
font-weight: 400 700;
font-stretch: 100%;
font-display: swap;
src: url('/assets/fonts/ibm-plex-sans-normal-latin.woff2') format('woff2');
unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* --- tokens.css --- */
:root {
--paper: #f3f5f8;
--sheet: #fdfdff;
--sheet-2: #eceff5;
--grid: rgba(16, 26, 51, 0.055);
--grid-major: rgba(16, 26, 51, 0.09);
--ink: #131c36;
--ink-2: #414f6d;
--ink-3: #5e6a81;
--rule: rgba(16, 26, 51, 0.14);
--rule-soft: rgba(16, 26, 51, 0.08);
--accent: #2f5fa8;
--signal-right: #2f7a45;
--signal-wrong: #c0392b;
--mat-bar: rgba(243, 245, 248, 0.72);
--mat-blur: blur(20px) saturate(180%);
--shadow-chip: 0 1px 2px rgba(16, 26, 51, 0.08);
--shadow-sheet: 0 1px 2px rgba(16, 26, 51, 0.05), 0 14px 30px -18px rgba(16, 26, 51, 0.28);
--shadow-lift: 0 2px 4px rgba(16, 26, 51, 0.08), 0 28px 50px -24px rgba(16, 26, 51, 0.34);
--ring: 0 0 0 3px var(--paper), 0 0 0 5px var(--focus);
--focus: #1b4ed8;
--font-display: 'Bricolage Grotesque', 'Bricolage Grotesque Fallback', system-ui, sans-serif;
--font-text: 'IBM Plex Sans', 'IBM Plex Sans Fallback', system-ui, -apple-system, sans-serif;
--text-xs: 0.8125rem;
--text-sm: 0.9375rem;
--text-base: 1.125rem;
--text-md: 1.3125rem;
--text-lg: 1.625rem;
--text-xl: 2.0625rem;
--text-2xl: 2.625rem;
--text-3xl: clamp(2.5rem, 5.2vw, 4.25rem);
--text-4xl: clamp(3.25rem, 12vw, 9rem);
--leading-tight: 1.08;
--leading-snug: 1.28;
--leading-body: 1.62;
--tracking-display: -0.025em;
--tracking-tight: -0.012em;
--s-1: 0.25rem;
--s-2: 0.5rem;
--s-3: 0.75rem;
--s-4: 1rem;
--s-5: 1.5rem;
--s-6: 2rem;
--s-7: 3rem;
--s-8: 4rem;
--s-9: 6rem;
--gutter: clamp(1.25rem, 5vw, 4rem);
--measure: 34rem;
--page: 76rem;
--r-xs: 4px;
--r-sm: 8px;
--r-md: 14px;
--r-lg: 22px;
--r-pill: 999px;
--ease-out: cubic-bezier(0.22, 1, 0.36, 1);
--ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
--dur-1: 120ms;
--dur-2: 220ms;
--on-level: #ffffff;
--level: var(--accent);
color-scheme: light;
}
@media (prefers-color-scheme: dark) {
:root:not([data-theme='light']) {
color-scheme: dark;
--paper: #0c1322;
--sheet: #141d31;
--sheet-2: #0a1120;
--grid: rgba(214, 226, 248, 0.055);
--grid-major: rgba(214, 226, 248, 0.1);
--ink: #e9eef9;
--ink-2: #b3bfd6;
--ink-3: #8e9cb6;
--rule: rgba(214, 226, 248, 0.18);
--rule-soft: rgba(214, 226, 248, 0.1);
--accent: #7ea3ee;
--mat-bar: rgba(12, 19, 34, 0.7);
--shadow-chip: 0 1px 2px rgba(0, 0, 0, 0.4);
--shadow-sheet: 0 1px 2px rgba(0, 0, 0, 0.35), 0 14px 30px -18px rgba(0, 0, 0, 0.7);
--shadow-lift: 0 2px 4px rgba(0, 0, 0, 0.45), 0 28px 50px -24px rgba(0, 0, 0, 0.8);
--on-level: #0c1322;
}
}
@media (prefers-reduced-transparency: reduce) {
:root { --mat-bar: var(--paper); --mat-blur: none; }
}
@media (prefers-contrast: more) {
:root {
--mat-bar: var(--paper);
--mat-blur: none;
--rule: var(--ink);
--rule-soft: var(--ink-2);
--ink-2: var(--ink);
--ink-3: var(--ink);
--grid: transparent;
--shadow-sheet: none;
--shadow-lift: none;
--shadow-chip: none;
}
}

/* --- site.css --- */
*,
*::before,
*::after { box-sizing: border-box; }
html {
-webkit-text-size-adjust: 100%;
scroll-behavior: smooth;
scroll-padding-top: 5rem;
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
margin: 0;
min-height: 100%;
font-family: var(--font-text);
font-size: var(--text-base);
line-height: var(--leading-body);
color: var(--ink);
background-color: var(--paper);
background-image:
linear-gradient(var(--grid) 1px, transparent 1px),
linear-gradient(90deg, var(--grid) 1px, transparent 1px),
linear-gradient(var(--grid-major) 1px, transparent 1px),
linear-gradient(90deg, var(--grid-major) 1px, transparent 1px);
background-size: 26px 26px, 26px 26px, 130px 130px, 130px 130px;
background-attachment: fixed;
text-rendering: optimizeLegibility;
-webkit-font-smoothing: antialiased;
overflow-x: hidden;
}
img, svg, canvas { max-width: 100%; height: auto; }
button, input, select { font: inherit; color: inherit; }
h1, h2, h3, h4 {
font-family: var(--font-display);
font-weight: 620;
font-optical-sizing: auto;
line-height: var(--leading-snug);
letter-spacing: var(--tracking-tight);
margin: 0;
text-wrap: balance;
}
p { margin: 0; }
a { color: inherit; }
summary { cursor: pointer; }
:focus-visible {
outline: 3px solid var(--focus);
outline-offset: 2px;
border-radius: var(--r-xs);
}
::selection { background: color-mix(in srgb, var(--level) 30%, transparent); }
.visually-hidden {
position: absolute !important;
width: 1px; height: 1px;
padding: 0; margin: -1px;
overflow: hidden; clip-path: inset(50%); white-space: nowrap;
}
.skip-link {
position: absolute;
left: var(--s-4); top: var(--s-2);
z-index: 100;
padding: var(--s-3) var(--s-4);
background: var(--ink); color: var(--paper);
border-radius: var(--r-sm);
font-size: var(--text-sm); font-weight: 600;
transform: translateY(-200%);
transition: transform var(--dur-2) var(--ease-out);
}
.skip-link:focus-visible { transform: none; }
.wrap {
width: 100%;
max-width: var(--page);
margin-inline: auto;
padding-inline: var(--gutter);
}
.section { padding-block: var(--s-7); }
.section:first-of-type { padding-top: var(--s-5); }
.section > h2 {
font-size: var(--text-xl);
letter-spacing: -0.03em;
margin-bottom: var(--s-5);
}
.prose { max-width: var(--measure); }
.prose p + p { margin-top: var(--s-4); }
.prose ul, .prose ol { margin: var(--s-4) 0 0; padding-left: 1.15em; max-width: var(--measure); }
.prose li + li { margin-top: var(--s-2); }
.prose li::marker { color: var(--ink-3); }
.prose strong { font-weight: 600; }
.prose a { text-decoration: underline; text-decoration-thickness: 1.5px; text-underline-offset: 3px; }
.prose a:hover { text-decoration-color: var(--level); }
.num { font-variant-numeric: tabular-nums; font-feature-settings: 'tnum' 1; }
.cols {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr));
gap: var(--s-6) var(--s-7);
}
.lede {
font-size: var(--text-md);
line-height: 1.5;
color: var(--ink-2);
max-width: 34rem;
}
.site-header {
position: sticky;
top: 0;
z-index: 40;
background: var(--mat-bar);
-webkit-backdrop-filter: var(--mat-blur);
backdrop-filter: var(--mat-blur);
}
.site-header::after {
content: '';
position: absolute;
inset: auto 0 -14px 0;
height: 14px;
pointer-events: none;
opacity: 0;
background: linear-gradient(to bottom, color-mix(in srgb, var(--ink) 9%, transparent), transparent);
transition: opacity var(--dur-2) linear;
}
.site-header[data-scrolled]::after { opacity: 1; }
.header-inner {
display: flex;
align-items: center;
gap: var(--s-5);
min-height: 4rem;
}
.brand {
display: inline-flex;
align-items: center;
min-height: 2.75rem;
gap: var(--s-2);
text-decoration: none;
font-family: var(--font-display);
font-weight: 680;
font-size: var(--text-md);
letter-spacing: var(--tracking-display);
margin-right: auto;
}
.site-nav { display: flex; align-items: center; gap: var(--s-4); }
.site-nav a {
display: inline-flex;
align-items: center;
min-height: 2.75rem;
text-decoration: none;
font-size: var(--text-sm);
color: var(--ink-2);
padding-block: var(--s-2);
border-bottom: 2px solid transparent;
}
.site-nav a:hover { color: var(--ink); border-bottom-color: color-mix(in srgb, var(--ink) 30%, transparent); }
@media (max-width: 32rem) {
.header-inner { min-height: 3.5rem; gap: var(--s-3); }
.site-nav { gap: var(--s-3); }
.site-nav a { font-size: var(--text-xs); min-height: 2.75rem; }
}
.btn {
--btn-bg: var(--ink);
--btn-fg: var(--paper);
display: inline-flex;
align-items: center;
gap: var(--s-2);
padding: 0.68em 1.1em;
border: 1px solid transparent;
border-radius: var(--r-sm);
background: var(--btn-bg);
color: var(--btn-fg);
font-size: var(--text-sm);
font-weight: 600;
text-decoration: none;
cursor: pointer;
transition: transform 90ms var(--ease-out), filter var(--dur-1) linear;
}
.btn:hover { filter: brightness(1.12); }
.btn:active { transform: scale(0.975); }
.btn--level { --btn-bg: var(--level); --btn-fg: var(--on-level); }
.btn--quiet {
--btn-bg: transparent;
--btn-fg: var(--ink);
border-color: var(--rule);
}
.btn--quiet:hover { filter: none; background: color-mix(in srgb, var(--ink) 6%, transparent); }
.link-btn {
appearance: none;
display: inline-flex;
align-items: center;
min-height: 2.75rem;
border: 0;
background: none;
padding: 0;
text-align: left;
color: var(--ink-2);
cursor: pointer;
font-size: var(--text-sm);
}
.link-btn:hover { color: var(--ink); text-decoration: underline; }
.breadcrumb { font-size: var(--text-sm); color: var(--ink-3); padding-block: var(--s-5) var(--s-4); }
.breadcrumb ol { list-style: none; display: flex; flex-wrap: wrap; gap: var(--s-2); margin: 0; padding: 0; }
.breadcrumb li + li::before { content: '/'; margin-right: var(--s-2); color: var(--rule); }
.breadcrumb a { text-decoration: none; color: var(--ink-2); }
.breadcrumb a:hover { text-decoration: underline; }
.level-mark {
font-family: var(--font-display);
font-weight: 700;
font-variant-numeric: tabular-nums;
color: var(--level);
line-height: 0.9;
}
.cta-row { display: flex; flex-wrap: wrap; gap: var(--s-3); align-items: center; }
.readout {
display: flex;
align-items: baseline;
gap: var(--s-2);
font-family: var(--font-display);
font-variant-numeric: tabular-nums;
font-weight: 660;
letter-spacing: -0.03em;
font-size: var(--text-xl);
line-height: 1;
}
.readout small {
font-family: var(--font-text);
font-size: var(--text-xs);
font-weight: 500;
color: var(--ink-3);
}
.equation {
display: flex;
flex-wrap: wrap;
align-items: center;
gap: 0.4em;
font-family: var(--font-display);
font-size: var(--text-lg);
font-weight: 620;
font-variant-numeric: tabular-nums;
letter-spacing: -0.02em;
}
.equation .op { color: var(--ink-3); }
.equation .slot {
min-width: 1.6em;
padding: 0.05em 0.25em;
text-align: center;
border-bottom: 3px solid var(--level);
color: var(--level);
}
.field { display: flex; align-items: center; gap: var(--s-3); font-size: var(--text-sm); }
.field label { color: var(--ink-2); }
.field output {
font-variant-numeric: tabular-nums;
font-weight: 600;
min-width: 1.6em;
color: var(--level);
}
.field--select label { color: var(--ink-3); }
select {
appearance: none;
min-height: 2.75rem;
padding: 0.45em 2em 0.45em 0.7em;
border-radius: var(--r-sm);
border: 1px solid var(--rule);
background-color: var(--sheet);
background-image: linear-gradient(45deg, transparent 50%, currentColor 50%), linear-gradient(135deg, currentColor 50%, transparent 50%);
background-position: right 0.85em center, right 0.55em center;
background-size: 5px 5px, 5px 5px;
background-repeat: no-repeat;
font-size: var(--text-sm);
font-weight: 600;
cursor: pointer;
}
input[type='range'] {
appearance: none;
height: 2.75rem;
background: transparent;
cursor: grab;
}
input[type='range']:active { cursor: grabbing; }
input[type='range']::-webkit-slider-runnable-track {
height: 6px; border-radius: var(--r-pill);
background: var(--sheet-2); border: 1px solid var(--rule-soft);
}
input[type='range']::-webkit-slider-thumb {
appearance: none;
width: 1.5rem; height: 1.5rem;
margin-top: -0.55rem;
border-radius: var(--r-pill);
background: var(--level);
border: 2px solid var(--sheet);
}
input[type='range']::-moz-range-track { height: 6px; border-radius: var(--r-pill); background: var(--sheet-2); }
input[type='range']::-moz-range-thumb {
width: 1.4rem; height: 1.4rem; border-radius: var(--r-pill);
background: var(--level); border: 2px solid var(--sheet);
}
.switch {
display: inline-flex;
align-items: center;
min-height: 2.75rem;
gap: var(--s-2);
font-size: var(--text-sm);
color: var(--ink-2);
cursor: pointer;
}
.switch input { inline-size: 1.1rem; block-size: 1.1rem; accent-color: var(--level); }
.notice {
border-left: 3px solid var(--level);
padding: var(--s-3) var(--s-4);
background: color-mix(in srgb, var(--level) 7%, transparent);
font-size: var(--text-sm);
color: var(--ink-2);
border-radius: 0 var(--r-sm) var(--r-sm) 0;
}
.steps { list-style: none; counter-reset: step; margin: 0; padding: 0; max-width: 46rem; }
.steps > li {
counter-increment: step;
display: grid;
grid-template-columns: 2.5rem minmax(0, 1fr);
gap: var(--s-4);
padding-block: var(--s-5);
border-top: 1px solid var(--rule-soft);
}
.steps > li:first-child { border-top: 0; padding-top: 0; }
.steps > li::before {
content: counter(step);
font-family: var(--font-display);
font-weight: 700;
font-size: var(--text-lg);
font-variant-numeric: tabular-nums;
color: var(--level);
line-height: 1.15;
}
.steps h3 { font-size: var(--text-md); font-weight: 620; }
.steps p { margin-top: var(--s-2); color: var(--ink-2); max-width: var(--measure); }
.example {
border-left: 3px solid color-mix(in srgb, var(--level) 55%, transparent);
padding-left: var(--s-5);
}
.example__q {
font-family: var(--font-display);
font-size: var(--text-md);
font-weight: 620;
font-variant-numeric: tabular-nums;
letter-spacing: -0.02em;
}
.example__a { color: var(--ink-2); font-size: var(--text-sm); margin-top: var(--s-2); max-width: 30rem; }
.example__a b { color: var(--ink); font-weight: 600; }
.flag-list { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--s-5); max-width: 40rem; }
.flag-list li { display: grid; grid-template-columns: 1.5rem minmax(0, 1fr); gap: var(--s-3); }
.flag-list li::before {
content: '!';
font-family: var(--font-display);
font-weight: 700;
color: var(--level);
}
.flag-list strong { display: block; font-size: var(--text-sm); font-weight: 600; margin-bottom: var(--s-1); }
.flag-list span { color: var(--ink-2); font-size: var(--text-sm); }
.faq { border-top: 1px solid var(--rule-soft); max-width: 48rem; }
.faq details { border-bottom: 1px solid var(--rule-soft); }
.faq summary {
display: flex;
gap: var(--s-4);
align-items: baseline;
padding-block: var(--s-4);
font-weight: 500;
list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
content: '+';
margin-left: auto;
font-family: var(--font-display);
font-size: var(--text-md);
color: var(--ink-3);
transition: transform var(--dur-2) var(--ease-out);
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq__answer {
display: grid;
grid-template-rows: 0fr;
transition: grid-template-rows var(--dur-2) var(--ease-out);
}
.faq details[open] .faq__answer { grid-template-rows: 1fr; }
.faq__answer > div { overflow: hidden; }
.faq__answer p { padding-bottom: var(--s-4); color: var(--ink-2); max-width: var(--measure); }
.faq__answer a { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
.site-footer {
margin-top: var(--s-8);
padding-block: var(--s-6) var(--s-7);
border-top: 1px solid var(--rule-soft);
font-size: var(--text-sm);
color: var(--ink-2);
}
.footer-grid {
display: flex;
flex-wrap: wrap;
gap: var(--s-6) var(--s-8);
justify-content: space-between;
}
.footer-nav { display: grid; gap: var(--s-2); align-content: start; }
.footer-nav a { text-decoration: none; color: var(--ink-2); }
.footer-nav a:hover { color: var(--ink); text-decoration: underline; }
.footer-nav__title {
font-size: var(--text-xs);
letter-spacing: 0.05em;
text-transform: uppercase;
color: var(--ink-3);
margin-bottom: var(--s-1);
}
.footer-nav__columns {
display: grid;
grid-template-columns: repeat(2, minmax(8rem, 1fr));
gap: var(--s-2) var(--s-6);
}
.footer-fine { margin-top: var(--s-6); color: var(--ink-3); font-size: var(--text-xs); }
@media (prefers-reduced-motion: reduce) {
*,
*::before,
*::after {
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
transition-duration: 0.01ms !important;
}
}

/* --- components.css --- */
.hero {
display: grid;
grid-template-columns: minmax(0, 24rem) minmax(0, 1fr);
gap: var(--s-6) var(--s-8);
align-items: start;
padding-block: var(--s-7) var(--s-6);
}
@media (max-width: 62rem) {
.hero { grid-template-columns: minmax(0, 1fr); padding-block: var(--s-5); }
}
.hero__copy h1 {
font-size: var(--text-3xl);
letter-spacing: -0.035em;
line-height: 1.03;
text-wrap: balance;
}
.hero__deck {
margin-top: var(--s-4);
font-size: var(--text-md);
line-height: 1.5;
color: var(--ink-2);
}
.trail {
--num: 2.6rem;
--line: 3.3rem;
position: relative;
list-style: none;
margin: 0;
padding: var(--s-2) 0 0;
}
.trail::before {
content: '';
position: absolute;
left: var(--line);
top: 0.6rem;
bottom: 1.8rem;
width: 2px;
translate: -1px 0;
background: var(--rule);
}
.trail::after {
content: '';
position: absolute;
left: var(--line);
top: 0.1rem;
width: 0.5rem;
height: 0.5rem;
translate: -50% 0;
border-left: 2px solid var(--ink-3);
border-top: 2px solid var(--ink-3);
rotate: 45deg;
}
.trail__stop { position: relative; }
.trail__link {
display: grid;
grid-template-columns: var(--num) minmax(0, 12rem) minmax(0, 1fr);
align-items: baseline;
gap: var(--s-2) var(--s-5);
padding-block: var(--s-4);
text-decoration: none;
}
.trail__num {
position: relative;
text-align: right;
font-family: var(--font-display);
font-size: var(--text-lg);
font-weight: 700;
line-height: 1;
font-variant-numeric: tabular-nums;
color: var(--ink-3);
transition: color var(--dur-1) linear;
}
.trail__num::after {
content: '';
position: absolute;
left: 100%;
top: 50%;
margin-left: 0.45rem;
width: 0.9rem;
height: 2px;
translate: 0 -50%;
background: var(--ink-3);
}
.trail__name {
font-family: var(--font-display);
font-size: var(--text-md);
font-weight: 620;
letter-spacing: -0.02em;
}
.trail__what { color: var(--ink-2); font-size: var(--text-sm); }
.trail__link:hover .trail__name { text-decoration: underline; text-underline-offset: 3px; }
.trail__link:hover .trail__num,
.trail__link:hover .trail__what { color: var(--ink); }
@media (max-width: 48rem) {
.trail { --num: 2.2rem; --line: 2.9rem; }
.trail__link { grid-template-columns: var(--num) minmax(0, 1fr); padding-block: var(--s-3); }
.trail__num { font-size: var(--text-md); }
.trail__what { grid-column: 2; }
}
.level-related {
display: flex;
flex-wrap: wrap;
gap: var(--s-2) var(--s-5);
margin-top: var(--s-6);
padding-top: var(--s-4);
border-top: 1px solid var(--rule-soft);
font-size: var(--text-sm);
}
.level-related a { color: var(--ink-2); text-decoration: none; border-bottom: 1px solid var(--rule); }
.level-related a:hover { color: var(--ink); border-bottom-color: var(--accent); }
.guide-list {
margin: var(--s-2) 0 0;
padding-left: 1.4em;
max-width: var(--measure);
}
.guide-list li { padding-block: var(--s-2); }
.guide-list li::marker { color: var(--ink-3); }
.guide-list a { text-decoration: underline; text-decoration-thickness: 1.5px; text-underline-offset: 3px; }
.guide-list a:hover { text-decoration-color: var(--accent); }
.terms {
display: grid;
gap: 0;
margin: 0;
border-top: 1px solid var(--rule);
max-width: 48rem;
}
.term { border-bottom: 1px solid var(--rule-soft); padding-block: var(--s-4); }
.term dt {
font-family: var(--font-display);
font-size: var(--text-md);
font-weight: 620;
letter-spacing: -0.02em;
}
.term dd { margin: var(--s-2) 0 0; color: var(--ink-2); max-width: var(--measure); }
.term__from { margin-top: var(--s-3); }
.term__link {
display: inline-flex;
align-items: center;
min-height: 2.75rem;
padding: 0 var(--s-4);
border-radius: var(--r-pill);
background: var(--sheet-2);
border: 1px solid var(--rule-soft);
color: var(--ink-2);
font-size: var(--text-sm);
text-decoration: none;
white-space: nowrap;
}
.term__link:hover { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 45%, transparent); }
.table-wrap { overflow-x: auto; }
.table {
border-collapse: collapse;
width: 100%;
max-width: 52rem;
font-size: var(--text-sm);
}
.table caption {
text-align: left;
color: var(--ink-3);
padding-bottom: var(--s-3);
}
.table th, .table td {
text-align: left;
vertical-align: top;
padding: var(--s-3) var(--s-4) var(--s-3) 0;
border-bottom: 1px solid var(--rule-soft);
}
.table thead th {
font-size: var(--text-xs);
font-weight: 600;
color: var(--ink-3);
border-bottom-color: var(--rule);
}
.table .num { width: 3.5rem; color: var(--ink-3); }
.table th[scope='row'] { font-weight: 620; }
.table th[scope='row'] a {
display: flex;
align-items: center;
min-height: 2.75rem;
text-decoration: underline;
text-decoration-thickness: 1.5px;
text-underline-offset: 3px;
}
.table th[scope='row'] a:hover { text-decoration-color: var(--accent); }
.page-head { padding-block: var(--s-5) var(--s-4); }
.page-head h1 { font-size: var(--text-2xl); letter-spacing: -0.035em; max-width: 26ch; }
.page-head .lede { margin-top: var(--s-4); }
.level-hero { padding-block: var(--s-2) var(--s-5); }
.level-hero h1 {
display: flex;
align-items: baseline;
gap: 0.25em;
font-size: var(--text-2xl);
letter-spacing: -0.04em;
line-height: 1;
}
.level-hero h1 .level-mark { font-size: 1.3em; }
.level-hero__body {
display: grid;
grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
gap: var(--s-5) var(--s-7);
align-items: end;
margin-top: var(--s-4);
}
@media (max-width: 56rem) { .level-hero__body { grid-template-columns: minmax(0, 1fr); } }
.level-hero__body .cta-row { justify-content: flex-end; }
@media (max-width: 56rem) { .level-hero__body .cta-row { justify-content: flex-start; } }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-4); padding-block: var(--s-6); }
.pager__link {
display: grid;
gap: var(--s-1);
padding: var(--s-4) 0;
border-top: 1px solid var(--rule);
text-decoration: none;
}
.pager__link--next { text-align: right; justify-items: end; }
.pager__link:hover { border-top-color: var(--level); }
.pager__link--empty { border-top-color: transparent; }
.pager__dir { font-size: var(--text-xs); color: var(--ink-3); }
.pager__name { font-family: var(--font-display); font-size: var(--text-md); font-weight: 620; letter-spacing: -0.02em; }
@media (max-width: 40rem) {
.pager { grid-template-columns: minmax(0, 1fr); }
.pager__link--next { text-align: left; justify-items: start; }
}
.stage {
border: 1px solid var(--rule-soft);
border-radius: var(--r-md);
background: var(--sheet);
overflow: hidden;
}
.stage__head {
display: flex;
flex-wrap: wrap;
align-items: center;
gap: var(--s-3) var(--s-5);
padding: var(--s-4) var(--s-5);
border-bottom: 1px solid var(--rule-soft);
}
.stage__title { font-size: var(--text-sm); font-weight: 600; }
.stage__hint { font-size: var(--text-sm); color: var(--ink-3); }
.stage__head .stage__hint { margin-left: auto; }
.seg {
display: inline-flex;
gap: 2px;
padding: 2px;
border-radius: var(--r-pill);
background: var(--sheet-2);
border: 1px solid var(--rule-soft);
}
.seg button {
appearance: none;
border: 0;
min-height: 2.75rem;
padding: 0 var(--s-4);
border-radius: var(--r-pill);
background: transparent;
color: var(--ink-2);
font-size: var(--text-sm);
font-weight: 600;
cursor: pointer;
transition: background-color var(--dur-1) linear, color var(--dur-1) linear;
}
.seg button:hover { color: var(--ink); }
.seg button[aria-pressed='true'] {
background: var(--sheet);
color: var(--ink);
box-shadow: var(--shadow-chip);
}
.stage__body {
padding: var(--s-5);
background-image:
linear-gradient(var(--grid-major) 1px, transparent 1px),
linear-gradient(90deg, var(--grid-major) 1px, transparent 1px);
background-size: 26px 26px;
}
.stage__body > * + * { margin-top: var(--s-5); }
.stage__controls {
display: flex;
flex-wrap: wrap;
align-items: center;
gap: var(--s-3) var(--s-5);
padding-top: var(--s-4);
border-top: 1px solid var(--rule-soft);
}
.stage[data-widget-error]::after {
content: 'This tool could not start. The writing below covers the same idea.';
display: block;
padding: var(--s-4) var(--s-5);
font-size: var(--text-sm);
color: var(--ink-2);
border-top: 1px solid var(--rule-soft);
}
.field { position: relative; }
.piece {
position: absolute;
top: 0;
left: 0;
width: 26px;
height: 26px;
margin: -13px 0 0 -13px;
cursor: grab;
will-change: transform;
}
.piece[data-dragging] { cursor: grabbing; }
.piece__face {
display: grid;
place-items: center;
width: 100%;
height: 100%;
border-radius: var(--r-pill);
font-size: 11px;
font-style: normal;
font-weight: 600;
font-variant-numeric: tabular-nums;
color: var(--on-level);
will-change: transform;
}
.piece--counter .piece__face {
background: var(--level);
box-shadow:
inset 0 -2px 0 rgba(0, 0, 0, 0.14),
inset 0 1px 0 rgba(255, 255, 255, 0.35);
}
.piece[data-leftover] .piece__face { opacity: 0.5; }
.tenframe {
display: grid;
grid-template-columns: repeat(var(--cols, 5), 1fr);
gap: 2px;
border: 1px solid color-mix(in srgb, var(--ink) 20%, transparent);
border-radius: var(--r-xs);
background: color-mix(in srgb, var(--ink) 5%, transparent);
overflow: hidden;
width: 100%;
}
.tenframe { max-width: 11rem; padding: 3px; }
.tenframe--wide { max-width: 32rem; }
.tenframe[data-full] { border-color: var(--level); }
.cell {
appearance: none;
aspect-ratio: 1;
min-height: 1.5rem;
display: grid;
place-items: center;
padding: 0;
border: 0;
border-radius: 3px;
background: var(--sheet);
cursor: pointer;
transition: background-color 140ms linear;
}
.cell:hover { background: color-mix(in srgb, var(--level) 12%, var(--sheet)); }
.cell__dot {
width: 76%;
height: 76%;
border-radius: var(--r-pill);
background: var(--level);
scale: 0;
opacity: 0;
transition: scale 180ms var(--ease-out), opacity 140ms linear;
}
.cell[data-filled] .cell__dot { scale: 1; opacity: 1; }
.cell--pop .cell__dot { animation: cell-pop 280ms var(--ease-out); }
@keyframes cell-pop {
0% { scale: 0.2; }
62% { scale: 1.16; }
100% { scale: 1; }
}
.count { display: grid; grid-template-columns: minmax(0, 1fr) 14rem; gap: var(--s-5); }
.count__tray {
position: relative;
min-height: 16rem;
border-radius: var(--r-sm);
border: 1px dashed color-mix(in srgb, var(--ink) 20%, transparent);
background: color-mix(in srgb, var(--ink) 3%, transparent);
cursor: crosshair;
touch-action: none;
overflow: hidden;
}
.count__side { display: flex; flex-direction: column; gap: var(--s-4); align-items: start; }
.count__word { font-family: var(--font-display); font-size: var(--text-lg); letter-spacing: -0.02em; color: var(--level); }
@media (max-width: 48rem) { .count { grid-template-columns: minmax(0, 1fr); } }
.add__frames { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-4); }
.add__op { font-family: var(--font-display); font-size: var(--text-lg); font-weight: 620; color: var(--ink-3); }
.bundle__board { position: relative; }
.bundle__grid {
position: relative;
display: grid;
grid-template-columns: repeat(var(--cols, 10), 1fr);
gap: 2px;
padding: 3px;
border: 1px solid color-mix(in srgb, var(--ink) 20%, transparent);
border-radius: var(--r-xs);
background: color-mix(in srgb, var(--ink) 5%, transparent);
}
.bundle__grid .cell { background: transparent; }
.bundle__grid .cell:not([data-filled]) { background: var(--sheet); }
.bundle__rods {
position: absolute;
inset: 4px;
display: grid;
grid-template-columns: 1fr;
grid-auto-rows: 1fr;
gap: 2px;
pointer-events: none;
}
.bundle__rod {
grid-row: calc(var(--row) + 1);
border-radius: 4px;
background: var(--level);
opacity: calc(var(--in, 0) * 0.9);
scale: calc(0.4 + 0.6 * var(--in, 0)) 1;
transform-origin: left center;
}
.bundle__readout { display: grid; gap: var(--s-3); justify-items: start; }
.bundle__readout .readout { gap: var(--s-3); }
.fraction, .percent { display: grid; gap: var(--s-5); }
.frac__bar {
position: relative;
height: 4.5rem;
touch-action: none;
}
.frac__parts {
display: flex;
height: 100%;
border: 2px solid color-mix(in srgb, var(--ink) 45%, transparent);
border-radius: var(--r-xs);
overflow: hidden;
}
.frac__part {
appearance: none;
flex: 1 1 0;
border: 0;
border-left: 1.5px solid color-mix(in srgb, var(--ink) 30%, transparent);
background: var(--sheet);
cursor: pointer;
padding: 0;
transition: background-color 160ms linear;
}
.frac__part:first-child { border-left: 0; }
.frac__part[data-filled] { background: var(--level); }
.frac__part:hover { background: color-mix(in srgb, var(--level) 22%, var(--sheet)); }
.frac__part[data-filled]:hover { background: color-mix(in srgb, var(--level) 80%, var(--ink)); }
.frac__handle {
position: absolute;
top: 50%;
left: calc(var(--parts) / 12 * 100%);
width: 1.6rem;
height: 1.6rem;
margin: -0.8rem 0 0 -0.8rem;
border-radius: var(--r-pill);
background: var(--ink);
border: 2.5px solid var(--sheet);
cursor: ew-resize;
touch-action: none;
will-change: transform;
}
.frac__handle[data-dragging] { background: var(--level); cursor: grabbing; }
.frac__readout { gap: var(--s-4); }
.frac__word { font-family: var(--font-text); font-size: var(--text-sm); color: var(--ink-3); }
.frac__stack {
display: grid;
justify-items: center;
gap: 2px;
font-size: var(--text-md);
font-weight: 700;
}
.frac__stack > span:first-child { border-bottom: 2px solid var(--level); padding: 0 0.35em 2px; }
.frac__stack > span:last-child { padding: 2px 0.35em 0; }
.lined__rail-host { min-width: 0; }
.numline { position: relative; height: 6rem; touch-action: none; }
.numline__rail {
position: absolute;
left: 0; right: 0; bottom: 2.2rem;
height: 2px;
background: color-mix(in srgb, var(--ink) 32%, transparent);
}
.numline__tick {
position: absolute;
left: calc(var(--at) * 100%);
bottom: 0;
width: 1px;
height: 0.5rem;
background: color-mix(in srgb, var(--ink) 24%, transparent);
transform: translateX(-50%);
}
.numline__tick--major { height: 0.95rem; background: color-mix(in srgb, var(--ink) 40%, transparent); }
.numline__tick b {
position: absolute;
top: 1.3rem;
left: 50%;
transform: translateX(-50%);
font-size: 0.72rem;
font-weight: 500;
color: var(--ink-3);
font-variant-numeric: tabular-nums;
white-space: nowrap;
}
.numline__marker {
position: absolute;
bottom: 1.6rem;
left: 0;
transform: translateX(calc(var(--x, 0px) - 50%));
display: flex;
align-items: center;
padding: 0.3rem 0.6rem;
border-radius: var(--r-sm);
background: var(--level);
color: var(--on-level);
font-size: var(--text-sm);
font-weight: 600;
font-variant-numeric: tabular-nums;
cursor: grab;
touch-action: none;
will-change: transform;
}
.numline__marker::after {
content: '';
position: absolute;
left: 50%;
top: 100%;
width: 2px;
height: 0.6rem;
background: var(--level);
transform: translateX(-50%);
}
.numline__marker[data-dragging] { cursor: grabbing; }
.numline__gap {
position: absolute;
bottom: 4.6rem;
left: var(--from);
width: calc(var(--to) - var(--from));
min-width: 2px;
border-radius: var(--r-xs);
background: color-mix(in srgb, var(--level) 14%, transparent);
border: 1.5px solid color-mix(in srgb, var(--level) 50%, transparent);
display: grid;
place-items: center;
}
.numline__gap span {
font-family: var(--font-display);
font-size: var(--text-sm);
font-weight: 700;
color: var(--level);
background: var(--sheet);
padding: 0 0.3rem;
border-radius: var(--r-xs);
}
.numline__gap[data-single] { display: none; }
.numline__gap[data-empty] span { opacity: 0.45; }
.mul { display: grid; gap: var(--s-5); }
.mul__viewport { display: grid; justify-items: center; gap: var(--s-4); min-height: 15rem; align-content: center; }
.array { --cell: 1.875rem; position: relative; display: inline-block; touch-action: none; }
.array__dots {
display: grid;
grid-template-columns: repeat(var(--cols), var(--cell));
grid-auto-rows: var(--cell);
}
.array__dot {
width: 66%;
height: 66%;
align-self: center;
justify-self: center;
border-radius: 4px;
background: var(--level);
will-change: transform;
}
.array__handle {
position: absolute;
left: calc(var(--cols) * var(--cell));
top: calc(var(--rows) * var(--cell));
width: 1.35rem;
height: 1.35rem;
margin: -0.675rem 0 0 -0.675rem;
border-radius: var(--r-pill);
background: var(--ink);
border: 2.5px solid var(--sheet);
cursor: nwse-resize;
touch-action: none;
will-change: transform;
}
.array__handle[data-dragging] { background: var(--level); cursor: grabbing; }
.share__field {
position: relative;
display: grid;
grid-template-columns: minmax(0, 0.42fr) minmax(0, 1fr);
gap: var(--s-5);
min-height: 19rem;
}
.share__pile {
position: relative;
border-radius: var(--r-sm);
border: 1px dashed color-mix(in srgb, var(--ink) 20%, transparent);
background: color-mix(in srgb, var(--ink) 3%, transparent);
}
.share__pile span {
position: absolute;
left: var(--s-3);
top: var(--s-2);
font-size: var(--text-xs);
color: var(--ink-3);
}
.share__pile[data-leftover]::after {
content: 'left over: ' attr(data-leftover);
position: absolute;
right: var(--s-3);
bottom: var(--s-2);
font-size: var(--text-xs);
font-weight: 600;
color: var(--level);
}
.share__groups {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(4.5rem, 1fr));
gap: var(--s-3);
}
.share__group {
position: relative;
min-height: 5.5rem;
border-radius: var(--r-sm);
border: 1px solid var(--rule-soft);
background: var(--sheet);
}
.share__group[data-full] { border-color: color-mix(in srgb, var(--level) 40%, transparent); }
.share__group-count {
position: absolute;
right: var(--s-2);
top: var(--s-1);
min-width: 1.4rem;
padding: 0 0.35rem;
border-radius: var(--r-pill);
text-align: center;
font-size: var(--text-xs);
font-weight: 700;
background: var(--sheet-2);
color: var(--ink-3);
}
.share__group-count[data-filled] { background: var(--level); color: var(--on-level); }
.share__readout { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-5); }
.share__remainder { color: var(--ink-3); }
@media (max-width: 48rem) { .share__field { grid-template-columns: minmax(0, 1fr); } }
.frac__handle::before,
.array__handle::before,
.sharebar__divider::before,
.numline__marker::before {
content: '';
position: absolute;
inset: -0.75rem;
}
@media (max-width: 48rem) {
.tenframe { max-width: 100%; }
}
.percent__grid {
display: grid;
grid-template-columns: repeat(var(--cols, 10), 1fr);
gap: 2px;
max-width: 26rem;
padding: 4px;
border: 1px solid color-mix(in srgb, var(--ink) 20%, transparent);
border-radius: var(--r-xs);
background: color-mix(in srgb, var(--ink) 5%, transparent);
}
.percent__grid .cell { border-radius: 2px; min-height: 0; }
.percent__readout { display: grid; gap: var(--s-3); justify-items: start; }
.ratio { display: grid; gap: var(--s-4); }
.sharebar {
position: relative;
height: 4rem;
border-radius: var(--r-sm);
border: 1.5px solid color-mix(in srgb, var(--ink) 35%, transparent);
overflow: visible;
touch-action: none;
}
.sharebar__left,
.sharebar__right {
position: absolute;
top: 0;
bottom: 0;
}
.sharebar__left {
left: 0;
width: calc(var(--share, 25) * 1%);
background: var(--level);
border-radius: var(--r-sm) 0 0 var(--r-sm);
}
.sharebar__right {
right: 0;
width: calc(var(--share, 75) * 1%);
background: color-mix(in srgb, var(--level) 28%, var(--sheet));
border-radius: 0 var(--r-sm) var(--r-sm) 0;
}
.sharebar__divider {
position: absolute;
top: -0.5rem;
bottom: -0.5rem;
left: calc(var(--at, 0.25) * 100%);
width: 1.5rem;
margin-left: -0.75rem;
display: grid;
place-items: center;
cursor: ew-resize;
touch-action: none;
will-change: transform;
}
.sharebar__divider i {
width: 0.5rem;
height: 100%;
border-radius: var(--r-pill);
background: var(--ink);
box-shadow: 0 0 0 3px var(--sheet);
}
.sharebar__divider[data-dragging] i { background: var(--level); }
.sharebar__divider:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
.practice { display: grid; gap: var(--s-5); }
.practice__bar {
display: flex;
flex-wrap: wrap;
gap: var(--s-4);
align-items: center;
justify-content: space-between;
}
.practice__score {
display: flex;
gap: var(--s-5);
font-size: var(--text-sm);
color: var(--ink-2);
font-variant-numeric: tabular-nums;
}
.qcard {
border: 1px solid var(--rule-soft);
border-radius: var(--r-md);
background: var(--sheet);
padding: var(--s-5);
display: grid;
gap: var(--s-5);
min-height: 19rem;
transition: border-color 200ms linear;
}
.qcard[data-entered] { opacity: 0; transform: translateY(10px); }
.qcard[data-state='right'] { border-color: color-mix(in srgb, var(--signal-right) 55%, transparent); }
.qcard[data-state='wrong'] { border-color: color-mix(in srgb, var(--signal-wrong) 55%, transparent); }
.qcard__prompt {
font-family: var(--font-display);
font-size: var(--text-lg);
font-weight: 560;
letter-spacing: -0.02em;
line-height: 1.25;
max-width: 34ch;
}
.qcard__visual { display: grid; place-items: center; }
.qcard__expression { font-size: var(--text-xl); justify-self: start; }
.qcard__grid {
display: grid;
grid-template-columns: minmax(0, 1fr) auto;
gap: var(--s-6);
align-items: end;
}
@media (max-width: 56rem) { .qcard__grid { grid-template-columns: minmax(0, 1fr); } }
.qcard__answer { display: grid; gap: var(--s-3); justify-items: start; }
.answerbox {
display: inline-flex;
align-items: baseline;
gap: var(--s-3);
padding: var(--s-2) var(--s-4);
border-radius: var(--r-sm);
border-bottom: 3px solid var(--rule-soft);
min-width: 10rem;
}
.answerbox[data-focus] { border-bottom-color: var(--level); }
.answerbox[hidden] { display: none; }
.answerbox__label { font-size: var(--text-xs); color: var(--ink-3); }
.answerbox__value {
font-family: var(--font-display);
font-size: var(--text-lg);
font-weight: 620;
font-variant-numeric: tabular-nums;
margin-left: auto;
}
.qcard__buttons { display: flex; flex-wrap: wrap; gap: var(--s-3); margin-top: var(--s-2); }
.keys {
display: grid;
grid-template-columns: repeat(4, minmax(3rem, 1fr));
gap: var(--s-2);
}
.key {
appearance: none;
min-height: 2.9rem;
padding-inline: var(--s-2);
border-radius: var(--r-sm);
border: 1px solid var(--rule-soft);
background: var(--sheet-2);
font-family: var(--font-display);
font-size: var(--text-md);
font-weight: 600;
font-variant-numeric: tabular-nums;
cursor: pointer;
transition: transform 90ms var(--ease-out), background-color 120ms linear;
}
.key:hover { background: color-mix(in srgb, var(--level) 12%, var(--sheet-2)); }
.key:active, .key[data-pressed] { transform: scale(0.94); }
.key--action { font-size: var(--text-sm); font-weight: 500; }
.key--zero { grid-column: span 2; }
.key--enter { grid-column: span 2; background: var(--level); color: var(--on-level); border-color: transparent; }
.qcard__feedback { font-size: var(--text-base); min-height: 1.6em; color: var(--ink-2); }
.qcard__feedback[data-state='right'] { color: var(--signal-right); font-weight: 600; }
.qcard__feedback[data-state='wrong'] { color: var(--signal-wrong); font-weight: 600; }
.qcard__feedback[data-state='warn'] { color: var(--ink); }
.viz { width: 100%; }
.viz--dots {
position: relative;
height: 11rem;
border-radius: var(--r-sm);
border: 1px dashed color-mix(in srgb, var(--ink) 18%, transparent);
}
.viz--dots .counter {
position: absolute;
width: 26px;
height: 26px;
margin: -13px 0 0 -13px;
border-radius: var(--r-pill);
background: var(--level);
}
.viz--frames { display: flex; flex-wrap: wrap; gap: var(--s-4); align-items: center; justify-content: center; }
.viz--frames .cell { cursor: default; }
.viz__op { font-family: var(--font-display); font-size: var(--text-md); color: var(--ink-3); }
.viz--line { position: relative; height: 4rem; padding-inline: 4%; }
.viz__rail {
position: absolute;
left: 4%;
right: 4%;
top: 2rem;
height: 2px;
background: color-mix(in srgb, var(--ink) 30%, transparent);
}
.viz__tick {
position: absolute;
left: calc(var(--at) * 100%);
top: -0.3rem;
width: 1px;
height: 0.45rem;
background: color-mix(in srgb, var(--ink) 25%, transparent);
}
.viz__tick[data-major] { height: 0.85rem; top: -0.55rem; }
.viz__marker {
position: absolute;
left: 4%;
top: 0.2rem;
transform: translateX(calc(var(--at) * 92% - 50%));
padding: 0.15rem 0.45rem;
border-radius: var(--r-xs);
background: var(--level);
color: var(--on-level);
font-size: var(--text-xs);
font-weight: 600;
font-variant-numeric: tabular-nums;
}
.viz__marker--to { opacity: 0.7; }
.viz--array {
display: grid;
grid-template-columns: repeat(var(--cols), 1.4rem);
gap: 0.3rem;
justify-content: center;
}
.viz--array .counter { width: 1.1rem; height: 1.1rem; border-radius: 3px; background: var(--level); }
.viz--bar {
display: flex;
height: 3.5rem;
max-width: 22rem;
border: 1.5px solid color-mix(in srgb, var(--ink) 40%, transparent);
border-radius: var(--r-xs);
overflow: hidden;
}
.viz__part { flex: 1 1 0; border-left: 1.5px solid color-mix(in srgb, var(--ink) 30%, transparent); background: var(--sheet); }
.viz__part:first-child { border-left: 0; }
.viz__part[data-filled] { background: var(--level); }
.viz--grid {
display: grid;
grid-template-columns: repeat(10, 1fr);
gap: 2px;
width: min(100%, 20rem);
padding: 3px;
border: 1px solid color-mix(in srgb, var(--ink) 20%, transparent);
border-radius: var(--r-xs);
}
.viz--grid .cell { aspect-ratio: 1; border-radius: 2px; }
.viz--groups { display: grid; gap: var(--s-4); }
.viz__pile { display: flex; flex-wrap: wrap; gap: 0.35rem; justify-content: center; }
.viz__pile .counter { width: 1.1rem; height: 1.1rem; border-radius: var(--r-pill); background: var(--level); }
.viz__plates { display: flex; flex-wrap: wrap; gap: var(--s-3); justify-content: center; }
.viz__plate {
min-width: 3.5rem;
min-height: 3rem;
border-radius: var(--r-sm);
border: 1px solid var(--rule-soft);
background: var(--sheet-2);
position: relative;
}
.viz__plate-label { position: absolute; right: 0.4rem; top: 0.2rem; font-size: var(--text-xs); color: var(--ink-3); }
@media (prefers-reduced-motion: reduce) {
.qcard[data-entered] { opacity: 1; transform: none; }
}