:root {
  --paper: #fbfaf7; --paper-2: #f2f0eb; --ink: #2b2932; --ink-2: #66636d;
  --ink-3: #918e96; --line: #ddd9d4; --accent: #7d3f91; --accent-soft: #f0e5f2;
  --serif: "Newsreader", Georgia, serif; --sans: "IBM Plex Sans", system-ui, -apple-system, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", monospace; --maxw: 1120px; --gutter: clamp(22px, 5vw, 64px);
}
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 16px/1.6 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
.wrap { max-width: var(--maxw); margin: auto; padding-inline: var(--gutter); }
.topbar { border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--paper) 88%, transparent); backdrop-filter: blur(12px); }
.topbar-inner { min-height: 67px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: flex; gap: 11px; align-items: center; font: 500 1.1rem var(--serif); }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
nav { display: flex; gap: 24px; color: var(--ink-2); font: 11px var(--mono); }
nav a:hover, .text-link:hover { color: var(--accent); }
.crumb { display: flex; gap: 12px; margin-top: 36px; color: var(--ink-3); font: 10px var(--mono); letter-spacing: .05em; text-transform: uppercase; }
.crumb a { color: var(--accent); }
.hero { max-width: 790px; padding: clamp(66px, 12vh, 140px) 0 92px; }
.label, .eyebrow { color: var(--accent); font: 500 11px var(--mono); letter-spacing: .13em; text-transform: uppercase; }
.hero h1 { max-width: 13ch; margin: 20px 0 25px; font: 400 clamp(3.4rem, 8vw, 7rem)/.91 var(--serif); letter-spacing: -.04em; }
.lead { max-width: 55ch; margin: 0; color: var(--ink-2); font-size: clamp(1.05rem, 1.6vw, 1.3rem); line-height: 1.55; }
.actions { display: flex; align-items: center; flex-wrap: wrap; gap: 24px; margin-top: 35px; }
.button { padding: 11px 17px; border: 1px solid var(--ink); background: var(--ink); color: var(--paper); font: 11px var(--mono); transition: transform .2s; }
.button:hover { transform: translateY(-2px); }
.text-link { padding-bottom: 4px; border-bottom: 1px solid var(--accent); font: 11px var(--mono); }
.content { display: grid; grid-template-columns: 1.1fr .9fr; gap: clamp(40px, 10vw, 130px); padding: 54px 0 112px; border-top: 1px solid var(--line); }
.feature-list { margin-top: 22px; border-top: 1px solid var(--line); }
.feature { display: grid; grid-template-columns: 40px 1fr; gap: 18px; padding: 21px 0; border-bottom: 1px solid var(--line); }
.feature span { color: var(--accent); font: 11px var(--mono); }
.feature p { margin: 0; max-width: 42ch; font: 400 1.25rem/1.25 var(--serif); }
.aside { align-self: start; padding: 25px; background: var(--paper-2); }
.aside p { margin: 21px 0 28px; color: var(--ink-2); font-size: .94rem; line-height: 1.65; }
footer { border-top: 1px solid var(--line); padding: 25px 0; color: var(--ink-3); font: 10px var(--mono); }
footer .wrap { display: flex; justify-content: space-between; gap: 15px; }
footer a { color: var(--accent); }

.repo-index { padding: 62px 0 110px; border-top: 1px solid var(--line); }
.repo-index-head { display: grid; grid-template-columns: .8fr 1.2fr; gap: clamp(30px, 8vw, 100px); align-items: end; }
.repo-index h2 { max-width: 11ch; margin-top: 17px; font: 400 clamp(2.2rem, 4.7vw, 4rem)/.98 var(--serif); letter-spacing: -.03em; }
.repo-intro { max-width: 58ch; margin: 0; color: var(--ink-2); line-height: 1.65; }
.repo-stats { display: flex; flex-wrap: wrap; gap: 1px; margin-top: 45px; background: var(--line); border: 1px solid var(--line); }
.repo-stat { display: flex; min-width: 125px; flex: 1; flex-direction: column; gap: 5px; padding: 17px 18px; background: var(--paper); }
.repo-stat strong { color: var(--ink); font: 400 1.7rem var(--serif); }
.repo-stat small { color: var(--ink-3); font: 10px var(--mono); letter-spacing: .06em; text-transform: uppercase; }
.start-box { margin-top: 45px; padding: 24px; background: var(--paper-2); }
.start-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; margin-top: 20px; background: var(--line); border: 1px solid var(--line); }
.start-item { display: grid; grid-template-columns: 42px minmax(0, 1fr) 18px; gap: 11px; align-items: center; padding: 13px 14px; background: var(--paper); font-size: .88rem; }
.start-item:hover, .file-item:hover { background: var(--accent-soft); color: var(--accent); }
.file-kind, .file-ext { color: var(--accent); font: 10px var(--mono); letter-spacing: .07em; }
.small-arrow { color: var(--ink-3); font: 12px var(--mono); }
.repo-map { margin-top: 55px; }
.repo-group { border-top: 1px solid var(--line); }
.repo-group:last-child { border-bottom: 1px solid var(--line); }
.repo-group summary { display: flex; justify-content: space-between; gap: 20px; padding: 18px 0; cursor: pointer; list-style: none; font: 400 1.35rem var(--serif); }
.repo-group summary::-webkit-details-marker { display: none; }
.repo-group summary::after { content: "+"; color: var(--accent); font: 16px var(--mono); }
.repo-group[open] summary::after { content: "−"; }
.group-count { align-self: center; color: var(--ink-3); font: 10px var(--mono); }
.file-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; padding-bottom: 25px; background: var(--line); }
.file-item { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 12px; padding: 11px 13px; background: var(--paper); font: 12px var(--mono); word-break: break-word; }
.file-ext { color: var(--ink-3); font-size: 9px; }
.muted { color: var(--ink-3); font-size: .9rem; }
.problem-archive { margin-top: 24px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.problem-archive summary { display: flex; justify-content: space-between; gap: 18px; padding: 16px 0; cursor: pointer; list-style: none; color: var(--ink-2); font: 11px var(--mono); letter-spacing: .05em; text-transform: uppercase; }
.problem-archive summary::-webkit-details-marker { display: none; }
.problem-archive summary::after { content: "+"; color: var(--accent); font-size: 16px; }
.problem-archive[open] summary::after { content: "−"; }
.problem-archive .resource-grid { margin: 0 0 20px; }

@media (max-width: 700px) {
  .topbar-inner { min-height: 60px; flex-wrap: wrap; padding-block: 11px; }
  nav { width: 100%; gap: 16px; overflow-x: auto; padding-bottom: 3px; scrollbar-width: none; }
  nav::-webkit-scrollbar { display: none; }
  nav a { flex: 0 0 auto; }
  .hero { padding-block: 70px; }
  .hero h1 { font-size: clamp(3.1rem, 16vw, 5rem); }
  .content, .repo-index-head { grid-template-columns: 1fr; }
  .content { padding-bottom: 70px; }
  .aside { max-width: 560px; }
  .repo-index { padding-bottom: 70px; }
  .start-list, .file-grid { grid-template-columns: 1fr; }
  .repo-stats { display: grid; grid-template-columns: repeat(2, 1fr); }
  .repo-stat { min-width: 0; }
  .repo-group summary { font-size: 1.18rem; }
}


/* Collection-first project pages */
.project-hero { max-width: var(--maxw); padding-top: 34px; padding-bottom: clamp(72px, 11vw, 130px); }
.project-hero .label { margin-top: 58px; }
.project-hero h1 { max-width: 12ch; margin: 20px 0 25px; font: 400 clamp(3.4rem, 8vw, 7rem)/.91 var(--serif); letter-spacing: -.04em; }
.project-intro { border-block: 1px solid var(--line); background: var(--paper-2); }
.project-intro .wrap { padding-block: clamp(44px, 7vw, 78px); }
.intro-grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: clamp(30px, 9vw, 120px); align-items: end; }
.intro-grid h2 { max-width: 14ch; margin-top: 18px; font: 400 clamp(2.1rem, 4vw, 3.8rem)/.98 var(--serif); letter-spacing: -.035em; }
.intro-grid p { max-width: 60ch; margin: 0; color: var(--ink-2); line-height: 1.68; }
.start-grid { margin-top: 36px; }
.project-content { padding-block: clamp(58px, 9vw, 105px); }
.collection-nav { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; margin: 22px 0 60px; border: 1px solid var(--line); background: var(--line); }
.collection-nav a { display: grid; grid-template-columns: 25px minmax(0, 1fr) auto; gap: 9px; align-items: baseline; min-width: 0; padding: 13px 14px; background: var(--paper); transition: background .18s, color .18s; }
.collection-nav a:hover, .collection-nav a:focus-visible { background: var(--accent-soft); color: var(--accent-strong); outline: none; }
.collection-nav span, .collection-nav small { color: var(--ink-3); font: 9px var(--mono); letter-spacing: .05em; text-transform: uppercase; white-space: nowrap; }
.collection-nav strong { overflow: hidden; font: 400 1rem/1.1 var(--serif); text-overflow: ellipsis; white-space: nowrap; }
.module-section, .problem-library { scroll-margin-top: 20px; padding: 42px 0 52px; border-top: 1px solid var(--line); }
.module-heading { display: grid; grid-template-columns: 48px minmax(0, 1fr); gap: 18px; margin-bottom: 24px; }
.module-index { color: var(--accent); font: 11px var(--mono); letter-spacing: .05em; }
.module-kicker { display: block; margin-bottom: 9px; color: var(--accent); font: 10px var(--mono); letter-spacing: .12em; text-transform: uppercase; }
.module-heading h3 { max-width: 21ch; margin: 0; font: 400 clamp(1.75rem, 3vw, 2.7rem)/1 var(--serif); letter-spacing: -.025em; }
.module-heading p { max-width: 58ch; margin: 11px 0 0; color: var(--ink-2); font-size: .92rem; }
.resource-grid { align-items: stretch; }
.resource-card { min-height: 180px; padding: 20px; cursor: pointer; }
.resource-card .resource-title { max-width: 28ch; font-size: 1.33rem; line-height: 1.12; white-space: normal; }
.resource-card .resource-summary { display: block; max-width: 40ch; }
.resource-card .resource-number:empty { display: none; }
.module-more { margin-top: 16px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.module-more summary { display: flex; justify-content: space-between; gap: 15px; padding: 16px 0; cursor: pointer; list-style: none; color: var(--ink-2); font: 11px var(--mono); letter-spacing: .04em; }
.module-more summary::-webkit-details-marker { display: none; }
.module-more summary::after { content: "+"; color: var(--accent); font-size: 16px; }
.module-more[open] summary::after { content: "−"; }
.module-more summary span { color: var(--ink-3); }
.module-more .resource-grid { margin-bottom: 18px; }
.problem-search { display: grid; grid-template-columns: 130px minmax(0, 1fr); gap: 18px; align-items: center; margin: 0 0 11px; padding: 15px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); color: var(--ink-3); font: 10px var(--mono); letter-spacing: .07em; text-transform: uppercase; }
.problem-search input { width: 100%; min-width: 0; border: 0; background: transparent; color: var(--ink); font: 400 1.08rem var(--serif); outline: none; }
.problem-search input::placeholder { color: var(--ink-3); }
.problem-search:focus-within { border-color: var(--accent); }
.problem-count { margin: 13px 0 18px; color: var(--ink-3); font: 10px var(--mono); letter-spacing: .05em; }
.problem-grid .resource-card { min-height: 155px; }
.problem-grid .resource-summary { font: 10px var(--mono); letter-spacing: .04em; text-transform: uppercase; }
.problem-grid .resource-number { color: var(--ink-3); }

/* Keep collection entries focused: title, type, and one clear action. */
.resource-card { display: flex; min-height: 164px; flex-direction: column; align-items: stretch; justify-content: flex-start; gap: 0; padding: 20px; }
.resource-card .resource-link-top { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; min-height: 16px; }
.resource-card .resource-title { display: block; max-width: 24ch; margin-top: 25px; overflow: visible; color: var(--ink); font: 400 clamp(1.35rem, 2.4vw, 1.85rem)/1.06 var(--serif); letter-spacing: -.02em; text-overflow: clip; white-space: normal; overflow-wrap: anywhere; }
.resource-card .resource-summary { display: block; margin-top: 10px; overflow: hidden; color: var(--ink-2); font: 10px/1.35 var(--mono); letter-spacing: .04em; text-overflow: ellipsis; text-transform: uppercase; white-space: nowrap; }
.resource-card .resource-action { align-self: flex-start; margin-top: auto; padding: 0; border: 0; color: var(--accent-strong); font-size: 9px; }
.resource-card .resource-action { display: none; }
.resource-card:hover .resource-title { color: var(--accent-strong); }
.problem-grid .resource-card { min-height: 145px; }
.problem-grid .resource-card .resource-title { margin-top: 18px; }

@media (max-width: 760px) {
  .intro-grid { grid-template-columns: 1fr; gap: 22px; }
  .collection-nav { grid-template-columns: 1fr; margin-bottom: 42px; }
  .module-section, .problem-library { padding-block: 34px; }
  .resource-card { min-height: 155px; }
  .problem-search { grid-template-columns: 1fr; gap: 8px; }
}

/* Resource system ----------------------------------------------------------
   The generator is moving from raw file links to semantic resource entries.
   Keep the legacy selectors above working while these selectors provide a
   compact, readable presentation for cards, collections, and file viewers. */
:root {
  --accent-strong: #653078;
  --radius: 2px;
  --shadow: 0 14px 35px rgb(43 41 50 / 10%);
}

button, a { -webkit-tap-highlight-color: transparent; }
button { color: inherit; font: inherit; }
.topbar { background: rgb(251 250 247 / 88%); background: color-mix(in srgb, var(--paper) 88%, transparent); }
.button { transition: transform .2s, background-color .2s, border-color .2s; }
.button:hover { background: var(--accent-strong); border-color: var(--accent-strong); }

/* Entry points: show the title first, and keep the full path secondary. */
.start-list,
.resource-list,
.resource-grid,
.resource-cards,
.collection-list { display: grid; gap: 1px; margin-top: 20px; background: var(--line); border: 1px solid var(--line); }
.start-list,
.resource-grid,
.resource-cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.start-item,
.resource-card,
.resource-item,
.resource-row,
.collection-row,
.directory-row { position: relative; min-width: 0; background: var(--paper); }
.start-item,
.resource-card,
.resource-item { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 12px; align-items: center; padding: 14px 15px; }
.start-item:hover,
.resource-card:hover,
.resource-item:hover,
.resource-row:hover,
.collection-row:hover,
.directory-row:hover,
.file-item:hover { background: var(--accent-soft); }
.resource-card,
.resource-item,
.resource-row,
.collection-row,
.directory-row { transition: background-color .18s ease; }
.resource-card > a:first-child,
.resource-item > a:first-child,
.resource-row > a:first-child,
.collection-row > a:first-child,
.directory-row > a:first-child { min-width: 0; }
.resource-card__body,
.resource-item__body,
.resource-row__body,
.collection-row__body,
.directory-row__body { min-width: 0; }
.resource-card__title,
.resource-item__title,
.resource-row__title,
.collection-row__title,
.directory-row__title,
.resource-name,
.resource-title { display: block; min-width: 0; overflow: hidden; color: var(--ink); font: 500 .9rem/1.35 var(--sans); text-overflow: ellipsis; white-space: nowrap; }
.resource-card:hover .resource-card__title,
.resource-item:hover .resource-item__title,
.resource-row:hover .resource-row__title,
.collection-row:hover .collection-row__title,
.directory-row:hover .directory-row__title { color: var(--accent-strong); }
.resource-card__description,
.resource-item__description,
.resource-row__description,
.collection-row__description,
.directory-row__description,
.resource-description { display: block; margin-top: 3px; overflow: hidden; color: var(--ink-2); font-size: .78rem; line-height: 1.4; text-overflow: ellipsis; white-space: nowrap; }
.resource-card__meta,
.resource-item__meta,
.resource-row__meta,
.collection-row__meta,
.directory-row__meta,
.resource-meta { display: flex; flex-wrap: wrap; gap: 7px 12px; margin-top: 6px; color: var(--ink-3); font: 9px var(--mono); letter-spacing: .04em; text-transform: uppercase; }
.resource-icon,
.resource-type,
.resource-kind,
.file-kind,
.file-ext { color: var(--accent); font: 10px var(--mono); letter-spacing: .07em; }
.small-arrow { color: var(--ink-3); font: 12px var(--mono); }

.resource-path,
.resource-card__path,
.resource-item__path,
.resource-row__path,
.collection-row__path,
.directory-row__path,
.file-path { display: block; max-width: 34ch; overflow: hidden; margin-top: 3px; color: var(--ink-3); font: 10px/1.35 var(--mono); text-overflow: ellipsis; white-space: nowrap; }
.resource-actions,
.resource-card__actions,
.resource-item__actions,
.resource-row__actions,
.collection-row__actions,
.directory-row__actions { display: flex; align-items: center; justify-content: flex-end; flex-wrap: wrap; gap: 8px; }
.resource-action,
.resource-preview,
.resource-open,
.preview-link,
.file-preview,
.resource-download,
.download-link,
.file-download { display: inline-flex; align-items: center; justify-content: center; min-height: 28px; padding: 5px 8px; border: 1px solid transparent; color: var(--accent-strong); font: 9px var(--mono); letter-spacing: .04em; text-transform: uppercase; white-space: nowrap; }
.resource-preview,
.resource-open,
.preview-link,
.file-preview { border-color: var(--accent); background: var(--paper); }
.resource-preview:hover,
.resource-open:hover,
.preview-link:hover,
.file-preview:hover { background: var(--accent); color: var(--paper); }
.resource-download,
.download-link,
.file-download { color: var(--ink-3); }
.resource-download:hover,
.download-link:hover,
.file-download:hover { color: var(--ink); border-color: var(--line); }
.resource-preview::before,
.resource-open::before,
.preview-link::before,
.file-preview::before { content: "↗"; margin-right: 5px; font-size: 11px; }
.resource-download::before,
.download-link::before,
.file-download::before { content: "↓"; margin-right: 5px; }

/* Collection and directory rows act as navigation rather than file dumps. */
.collection-list,
.directory-list,
.resource-directories { grid-template-columns: 1fr; }
.collection-row,
.directory-row { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 14px; align-items: center; padding: 13px 15px; }
.collection-row::before,
.directory-row::before { content: "⌁"; color: var(--accent); font: 17px var(--serif); }
.collection-row__count,
.directory-row__count,
.resource-count { color: var(--ink-3); font: 10px var(--mono); white-space: nowrap; }
.resource-children,
.collection-children,
.directory-children { padding: 0 15px 15px 48px; background: var(--paper); }

/* The old file map remains usable, but long paths no longer control layout. */
.file-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.file-item { min-width: 0; align-items: center; word-break: normal; }
.file-item > span:first-child { display: block; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-ext { white-space: nowrap; }

/* In-page resource viewer. Supports dialog, anchored-panel, and transition names. */
.resource-modal,
.resource-viewer-modal,
.modal-viewer,
.file-modal,
.modal { position: fixed; z-index: 20; inset: 0; display: none; align-items: center; justify-content: center; padding: clamp(16px, 4vw, 48px); background: rgb(43 41 50 / 48%); }
.resource-modal[open],
.resource-viewer-modal[open],
.modal-viewer[open],
.file-modal[open],
.modal.is-open,
.modal.open { display: flex; }
.resource-modal::backdrop,
.resource-viewer-modal::backdrop,
.modal-viewer::backdrop,
.file-modal::backdrop { background: rgb(43 41 50 / 48%); }
.resource-modal__dialog,
.resource-viewer,
.modal-viewer__panel,
.file-modal__dialog,
.modal-content { display: flex; width: min(100%, 980px); max-height: min(88vh, 900px); flex-direction: column; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper); box-shadow: var(--shadow); }
.resource-modal__header,
.resource-viewer__header,
.modal-viewer__header,
.file-modal__header,
.modal-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 24px; padding: 18px 22px; border-bottom: 1px solid var(--line); background: var(--paper-2); }
.resource-modal__title,
.resource-viewer__title,
.modal-viewer__title,
.file-modal__title,
.modal-title { margin: 0; font: 400 clamp(1.3rem, 3vw, 2rem)/1.1 var(--serif); }
.resource-modal__close,
.resource-viewer__close,
.modal-viewer__close,
.file-modal__close,
.modal-close { width: 32px; height: 32px; flex: 0 0 auto; border: 1px solid var(--line); background: var(--paper); color: var(--accent-strong); cursor: pointer; font: 16px/1 var(--mono); }
.resource-modal__close:hover,
.resource-viewer__close:hover,
.modal-viewer__close:hover,
.file-modal__close:hover,
.modal-close:hover { border-color: var(--accent); background: var(--accent-soft); }
.resource-modal__body,
.resource-viewer__body,
.modal-viewer__body,
.file-modal__body,
.modal-body { min-height: 0; overflow: auto; padding: 22px; }
.resource-modal pre,
.resource-viewer pre,
.modal-viewer pre,
.file-modal pre,
.modal-content pre { margin: 0; overflow: auto; padding: 18px; border: 1px solid var(--line); background: #f5f3ef; color: var(--ink); font: 12px/1.65 var(--mono); white-space: pre-wrap; overflow-wrap: anywhere; }
.resource-modal iframe,
.resource-viewer iframe,
.modal-viewer iframe,
.file-modal iframe { width: 100%; min-height: 62vh; border: 0; background: white; }
.resource-modal__footer,
.resource-viewer__footer,
.modal-viewer__footer,
.file-modal__footer,
.modal-footer { display: flex; justify-content: flex-end; gap: 10px; padding: 14px 22px; border-top: 1px solid var(--line); }

a:focus-visible,
button:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

@media (max-width: 820px) {
  .repo-index-head { grid-template-columns: 1fr; }
  .repo-index h2 { max-width: 14ch; }
  .resource-card,
  .resource-item { grid-template-columns: auto minmax(0, 1fr); }
  .resource-card__actions,
  .resource-item__actions { grid-column: 2; justify-content: flex-start; }
}

@media (max-width: 700px) {
  .start-list,
  .file-grid,
  .resource-grid,
  .resource-cards { grid-template-columns: 1fr; }
  .start-item,
  .resource-card,
  .resource-item,
  .resource-row { grid-template-columns: auto minmax(0, 1fr); }
  .start-item > .small-arrow,
  .resource-card__actions,
  .resource-item__actions,
  .resource-row__actions { grid-column: 2; justify-content: flex-start; }
  .resource-actions,
  .collection-row__actions,
  .directory-row__actions { justify-content: flex-start; }
  .collection-row,
  .directory-row { grid-template-columns: auto minmax(0, 1fr); }
  .collection-row__count,
  .directory-row__count,
  .resource-count { grid-column: 2; }
  .resource-path,
  .resource-card__path,
  .resource-item__path,
  .resource-row__path,
  .collection-row__path,
  .directory-row__path,
  .file-path { max-width: 100%; }
  .resource-modal,
  .resource-viewer-modal,
  .modal-viewer,
  .file-modal,
  .modal { align-items: flex-end; padding: 0; }
  .resource-modal__dialog,
  .resource-viewer,
  .modal-viewer__panel,
  .file-modal__dialog,
  .modal-content { width: 100%; max-height: 94vh; }
  .resource-modal__header,
  .resource-viewer__header,
  .modal-viewer__header,
  .file-modal__header,
  .modal-header,
  .resource-modal__body,
  .resource-viewer__body,
  .modal-viewer__body,
  .file-modal__body,
  .modal-body { padding-inline: 17px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

/* Curated collections: cards fill their own space and never create blank tiles. */
.resource-grid,
.start-grid,
.resource-cards,
.resource-list { grid-template-columns: repeat(auto-fit, minmax(min(100%, 265px), 1fr)); gap: 12px; margin-top: 20px; border: 0; background: transparent; }
.resource-card { min-height: 0; border: 1px solid var(--line); background: var(--paper); }
.resource-card:hover { border-color: var(--accent); background: var(--accent-soft); }
.problem-tools { display: grid; grid-template-columns: minmax(0, 1fr) minmax(170px, 230px); gap: 16px; align-items: end; }
.problem-tools .problem-search { margin-bottom: 0; }
.problem-filter { display: grid; gap: 8px; padding: 15px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); color: var(--ink-3); font: 10px var(--mono); letter-spacing: .07em; text-transform: uppercase; }
.problem-filter select { width: 100%; border: 0; background: var(--paper); color: var(--ink); font: 400 1rem var(--serif); outline: none; }
.problem-filter:focus-within { border-color: var(--accent); }
.problem-grid { grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr)); }
.problem-grid .resource-card { min-height: 0; }
.problem-more { display: block; margin: 22px auto 0; padding: 10px 16px; border: 1px solid var(--line); background: var(--paper); color: var(--accent-strong); cursor: pointer; font: 10px var(--mono); letter-spacing: .06em; text-transform: uppercase; }
.problem-more:hover { border-color: var(--accent); background: var(--accent-soft); }
.module-overflow { margin: 16px 0 4px; padding: 12px 0 0; border-top: 1px solid var(--line); }
.collection-nav { grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr)); gap: 12px; margin-top: 22px; border: 0; background: transparent; }
.collection-nav a { min-width: 0; border: 1px solid var(--line); background: var(--paper); }
.collection-nav a:hover, .collection-nav a:focus-visible { border-color: var(--accent); }

/* Project overview is the orientation point; repository metadata stays out of the learning path. */
.project-readme { display: grid; grid-template-columns: minmax(120px, .25fr) minmax(0, 1fr); gap: 22px 42px; margin-top: 38px; padding-top: 26px; border-top: 1px solid var(--line); }
.readme-label { color: var(--accent); font: 10px var(--mono); letter-spacing: .12em; text-transform: uppercase; }
.readme-copy { min-width: 0; max-width: 72ch; overflow-wrap: anywhere; color: var(--ink-2); line-height: 1.68; }
.readme-copy p { margin: 0 0 14px; }
.readme-copy h3 { margin: 0 0 12px; color: var(--ink); font: 400 1.55rem/1.08 var(--serif); }
.readme-copy a { color: var(--accent-strong); text-decoration: underline; text-underline-offset: 3px; }
.readme-copy code { padding: .1em .3em; background: var(--accent-soft); font: .86em var(--mono); }
.project-readme-full { display: grid; grid-template-columns: minmax(120px, .25fr) minmax(0, 1fr); gap: 22px 42px; margin-top: 0; padding-top: 0; }
.readme-full-copy { min-width: 0; max-width: 78ch; color: var(--ink-2); line-height: 1.68; }
.readme-full-copy h2, .readme-full-copy h3, .readme-full-copy h4, .readme-full-copy h5 { scroll-margin-top: 28px; color: var(--ink); font-family: var(--serif); font-weight: 400; line-height: 1.08; }
.readme-full-copy h2 { margin: 0 0 18px; font-size: clamp(1.8rem, 3vw, 2.6rem); }
.readme-full-copy h3 { margin: 42px 0 14px; font-size: clamp(1.45rem, 2.3vw, 2rem); }
.readme-full-copy h4, .readme-full-copy h5 { margin: 28px 0 12px; font-size: 1.25rem; }
.readme-full-copy p { margin: 0 0 18px; }
.readme-full-copy ul { margin: 0 0 24px; padding-left: 1.25rem; }
.readme-full-copy li { margin: 0 0 13px; padding-left: 5px; }
.readme-full-copy a { color: var(--accent-strong); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.readme-full-copy a:hover { color: var(--ink); }
.readme-inline-toc { margin: 0 0 34px; padding: 18px 20px 14px; border: 1px solid var(--line); background: var(--accent-soft); }
.readme-inline-toc .readme-label { margin-bottom: 10px; }
.readme-inline-toc ul { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 7px 28px; margin: 0; padding-left: 1.1rem; }
.readme-inline-toc li { margin: 0; padding-left: 2px; }
.readme-inline-toc a { color: var(--accent-strong); }
.readme-inline-figure { margin: 24px 0 30px; }
.readme-inline-figure img { display: block; width: 100%; max-height: 360px; object-fit: contain; border: 1px solid var(--line); background: var(--paper); }
.readme-inline-figure figcaption { margin-top: 8px; color: var(--ink-3); font: 9px/1.4 var(--mono); letter-spacing: .06em; text-transform: uppercase; }
.project-content:has(.project-readme-full) > .eyebrow,
.project-content:has(.project-readme-full) > .readme-map-nav { display: none; }
.resource-card .resource-title { max-width: 26ch; margin-top: 16px; font-size: clamp(1rem, 1.45vw, 1.18rem); line-height: 1.16; overflow: hidden; overflow-wrap: normal; text-overflow: ellipsis; text-wrap: balance; display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }
.resource-card { min-height: 112px; padding: 16px; }
.module-heading p { max-width: 58ch; }
.module-heading h3 { max-width: 31ch; }
.module-inline { display: grid; gap: 20px; margin: 0 0 26px; padding: 0; border: 0; background: transparent; }
.module-description { max-width: 72ch; margin: 0; color: var(--ink-2); line-height: 1.65; }
.module-links { display: flex; flex-wrap: wrap; gap: 10px 18px; }
.module-links a { color: var(--accent-strong); font: 10px var(--mono); letter-spacing: .06em; text-transform: uppercase; text-decoration: underline; text-underline-offset: 4px; }
.module-notes { margin: 0; padding: 0; border: 0; }
.module-notes .readme-label { display: none; }
.module-notes .readme-copy { max-width: 72ch; }
.module-figures,
.module-results { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 310px), 1fr)); gap: 16px; }
.module-figures figure,
.module-results figure { min-width: 0; margin: 0; padding: 12px; border: 1px solid var(--line); background: var(--paper); }
.module-figures img,
.module-results img { display: block; width: 100%; height: auto; max-height: 360px; object-fit: contain; background: var(--paper); }
.module-figures figcaption,
.module-results figcaption { margin-top: 8px; overflow: hidden; color: var(--ink-3); font: 9px/1.35 var(--mono); text-overflow: ellipsis; text-transform: uppercase; white-space: nowrap; }
.collection-nav strong { line-height: 1.15; text-overflow: clip; white-space: normal; }
.readme-map-nav { margin: 0 0 42px; }
.readme-toc { margin: 0; padding: 18px 0 22px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.readme-toc-label { margin-bottom: 14px; color: var(--accent); font: 10px var(--mono); letter-spacing: .12em; text-transform: uppercase; }
.readme-toc-links { display: flex; flex-wrap: wrap; gap: 9px; }
.readme-toc-links a { display: inline-flex; align-items: baseline; gap: 8px; padding: 8px 10px; border: 1px solid var(--line); color: var(--ink); font: 400 1rem/1.1 var(--serif); }
.readme-toc-links a:hover, .readme-toc-links a:focus-visible { border-color: var(--accent); background: var(--accent-soft); outline: none; }
.readme-toc-links span { color: var(--ink-3); font: 9px var(--mono); }
.readme-resource-map { display: grid; gap: 58px; }
.readme-resource-section { scroll-margin-top: 28px; }
.readme-resource-heading { display: grid; grid-template-columns: 34px minmax(0, 1fr) auto; align-items: baseline; gap: 12px; margin-bottom: 18px; }
.readme-resource-heading > span, .readme-resource-heading small { color: var(--ink-3); font: 9px var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.readme-resource-heading h3 { margin: 0; font: 400 clamp(1.45rem, 2.4vw, 2rem)/1.08 var(--serif); }
.external-resource-card .resource-summary { max-width: 52ch; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.external-resource-card .resource-summary a { color: inherit; }
@media (max-width: 700px) {
  .project-readme-full { grid-template-columns: 1fr; gap: 12px; }
  .readme-inline-toc ul { grid-template-columns: 1fr; }
  .project-readme { grid-template-columns: 1fr; gap: 12px; margin-top: 28px; }
  .readme-resource-heading { grid-template-columns: 28px minmax(0, 1fr); }
  .readme-resource-heading small { grid-column: 2; }
}
.resource-viewer-math { overflow-x: auto; padding: 12px 0; color: var(--ink); text-align: center; }
.resource-viewer-badge { width: auto; max-width: min(100%, 220px); margin: 0; }
@media (max-width: 700px) {
  .resource-grid, .start-grid, .resource-cards, .resource-list, .problem-grid { grid-template-columns: 1fr; }
  .problem-tools { grid-template-columns: 1fr; gap: 0; }
  .problem-filter { margin-top: 10px; }
}