/*
 * NextStep Education — working surfaces
 * Adapted design patterns: 21st.dev's bordered feature cards, segmented tabs,
 * compact form controls and accordion rows. References:
 * https://21st.dev/@efferd/components/blogs-3
 * https://21st.dev/@efferd/components/grid-feature-cards
 * https://21st.dev/@ln-dev7/components/member-list
 * https://21st.dev/@efferd/components/minimal-auth-page
 * https://21st.dev/@ln-dev7/components/animated-navigation-tabs
 * https://21st.dev/@ln-dev7/components/faqs-02
 * These are native CSS adaptations
 * for the existing application, not imports of third-party React components.
 * The site palette and shared navigation are defined by the main theme.
 */

/* Quiet page introductions. */
html:root body:not([data-page="home"]) :is(.page-hero, .support-hero, .guide-reader-hero, .subject-page-hero, .prac-page-header) {
  border-bottom: 1px solid var(--line);
  background: var(--canvas);
  box-shadow: none;
}
html:root body:not([data-page="home"]) :is(.page-hero, .support-hero, .guide-reader-hero, .subject-page-hero, .prac-page-header)::before,
html:root body:not([data-page="home"]) :is(.page-hero, .support-hero, .guide-reader-hero, .subject-page-hero, .prac-page-header)::after {
  display: none;
}
html:root body:not([data-page="home"]) .page-hero {
  padding-block: clamp(3rem, 5.5vw, 5rem);
}
html:root body:not([data-page="home"]) .page-hero-inner {
  max-width: 54rem;
  margin-inline: 0;
  text-align: left;
}
html:root body:not([data-page="home"]) .page-hero h1 {
  max-width: 22ch;
  font-size: clamp(2.4rem, 4.7vw, 4rem);
  line-height: 1.08;
  letter-spacing: -.045em;
}
html:root body.zh[data-page] :is(.page-hero, .learn-hero) h1 {
  max-width: none;
  line-height: 1.25;
  letter-spacing: -.025em;
}
html:root body:not([data-page="home"]) .page-hero p {
  max-width: 62ch;
  margin: 1.25rem 0 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.65;
}
html:root body:not([data-page="home"]) .page-hero .badge {
  width: fit-content;
  margin: 0 0 1.15rem !important;
  padding: .3rem .65rem;
  border: 1px solid var(--line);
  border-radius: .4rem;
  background: var(--paper);
  color: var(--brand);
  font-size: .72rem;
  font-weight: 650;
  letter-spacing: .01em;
}
html:root body:not([data-page="home"]) :is(.card, .value-card, .team-card, .account-card, .admin-card, .calendar-card, .compose-card, .reply-card, .post-card, .request-card) {
  border-color: var(--line);
  box-shadow: none;
}
html:root body:not([data-page="home"]) :is(.card, .value-card, .team-card):hover {
  box-shadow: none;
  transform: none;
}
html:root body:not([data-page="home"]) .bg-surface,
html:root body:not([data-page="home"]) .bg-alt {
  background: var(--paper-warm);
}

/* Resource finder: a readable collection with a clear control hierarchy. */
html:root body[data-page="resources"] .learn-hero {
  padding-block: clamp(3rem, 5.5vw, 5rem);
  background: var(--canvas);
}
html:root body[data-page="resources"] .learn-hero h1 {
  max-width: 18ch;
  font-size: clamp(2.5rem, 4.7vw, 4rem);
  line-height: 1.08;
}
html:root body[data-page="resources"] .learn-hero-summary {
  max-width: 58ch;
  margin-top: 1.25rem;
  color: var(--muted);
  font-size: 1rem;
}
html:root body[data-page="resources"] .learn-hero-note {
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--panel-radius);
  background: var(--paper-warm);
}
html:root body[data-page="resources"] .learn-hero-note h2 { font-size: 1rem; }
html:root body[data-page="resources"] .guide-desk-layout {
  grid-template-columns: minmax(12rem, .85fr) minmax(0, 3fr);
  gap: clamp(2rem, 5vw, 4.5rem);
}
html:root body[data-page="resources"] .guide-desk-intro h2 {
  font-size: clamp(1.7rem, 2.7vw, 2.4rem);
  line-height: 1.15;
}
html:root body[data-page="resources"] .guide-desk-facts { border-top: 1px solid var(--line-strong); }
html:root body[data-page="resources"] .resource-finder-controls {
  gap: 1.25rem;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--panel-radius);
  background: var(--paper);
}
html:root body[data-page="resources"] .resource-search-field {
  grid-template-columns: 1fr;
  gap: .6rem;
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
}
html:root body[data-page="resources"] .resource-search-field input {
  width: 100%;
  min-height: 3rem;
  padding: .7rem .85rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--control-radius);
  background: var(--canvas);
  color: var(--ink);
  font-size: .875rem;
  box-shadow: none;
}
html:root body[data-page="resources"] .resource-search-field:focus-within { box-shadow: none; }
html:root body[data-page="resources"] .resource-search-field input:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 10%, transparent);
}
html:root body[data-page="resources"] :is(.guide-public-filters, .resources-filter, .resource-scope-options) {
  gap: .45rem;
  border: 0;
}
html:root body[data-page="resources"] :is(.guide-public-filter, .filter-btn) {
  min-height: 2.75rem;
  padding: .5rem .75rem;
  border: 1px solid var(--line);
  border-radius: var(--control-radius);
  background: var(--paper);
  color: var(--ink-soft);
  font-size: .78rem;
  font-weight: 600;
}
html:root body[data-page="resources"] .guide-public-filter::before { display: none; }
html:root body[data-page="resources"] :is(.guide-public-filter, .filter-btn):hover {
  border-color: var(--line-strong);
  background: var(--paper-warm);
  color: var(--brand-strong);
}
html:root body[data-page="resources"] :is(.guide-public-filter, .filter-btn).active {
  border-color: var(--brand);
  background: var(--brand);
  color: var(--paper);
}
html:root body[data-page="resources"] .resource-refine-disclosure {
  border: 0;
  border-top: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
}
html:root body[data-page="resources"] .resource-refine-disclosure > summary {
  padding: 1rem 2rem 1rem 0;
  border: 0;
  background: transparent;
  color: var(--ink-soft);
  font-size: .82rem;
}
html:root body[data-page="resources"] .resource-refine-row { padding: 0; }
html:root body[data-page="resources"] .resource-format-field select {
  min-height: 2.75rem;
  border-color: var(--line-strong);
  border-radius: var(--control-radius);
  background: var(--paper);
}
html:root body[data-page="resources"] .guide-results-heading { border-top: 0; }
html:root body[data-page="resources"] .guide-results-heading { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: .75rem 1.5rem; }
html:root body[data-page="resources"] .guide-results-heading p { margin: .4rem 0 0; font-size: .875rem; line-height: 1.6; }
html:root body[data-page="resources"] .guide-public-empty {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-column: 1 / -1;
  justify-items: start;
  gap: .75rem;
  width: 100%;
  min-width: 0;
  padding: clamp(1.5rem, 4vw, 2.25rem);
  border: 1px solid var(--line);
  border-radius: .75rem;
  background: var(--paper);
  text-align: left;
}
html:root body[data-page="resources"] .guide-public-empty h3 { margin: 0; font-size: 1.15rem; line-height: 1.5; }
html:root body[data-page="resources"] .guide-public-empty p { max-width: 48ch; margin: 0; font-size: .9375rem; line-height: 1.8; }
html:root body[data-page="resources"] .guide-public-empty .btn { margin-top: .5rem; min-height: 2.75rem; }
html:root body[data-page="resources"] .guide-load-status { position: static; width: auto; height: auto; margin: 0 0 1.25rem; padding: .75rem 1rem; overflow: visible; clip: auto; white-space: normal; flex-wrap: wrap; font-size: .875rem; line-height: 1.6; }
html:root body[data-page="resources"] .guide-load-status > span:not(.guide-load-mark) { flex: 1 1 14rem; }
html:root body[data-page="resources"] .guide-catalog-retry { min-height: 2.75rem; padding: .4rem .75rem; border: 1px solid currentColor; border-radius: .4rem; background: transparent; color: inherit; font: inherit; font-weight: 600; cursor: pointer; }
html:root body[data-page="resources"] :is(.guide-public-grid, .resource-grid) {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  border: 0;
}
html:root body[data-page="resources"] :is(.guide-public-card, .resource-card) {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: .9rem;
  min-height: 15rem;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: .75rem;
  background: var(--paper);
  box-shadow: none;
  transition: border-color .18s ease, background-color .18s ease;
}
html:root body[data-page="resources"] :is(.guide-public-card, .resource-card):hover {
  border-color: var(--brand);
  background: var(--paper);
  box-shadow: none;
  transform: none;
}
html:root body[data-page="resources"] :is(.guide-public-card, .resource-card)::before { display: none; }
html:root body[data-page="resources"] :is(.resource-tag, .guide-card-badge) {
  padding: .25rem .5rem;
  border: 1px solid var(--line);
  border-radius: .35rem;
  background: var(--paper-warm) !important;
  color: var(--ink-soft) !important;
  font-size: .65rem;
  font-weight: 600;
  letter-spacing: 0;
  text-transform: none;
}
html:root body[data-page="resources"] .guide-card-badge.category::before { display: none; }
html:root body[data-page="resources"] .resource-card-index { display: none; }
html:root body[data-page="resources"] :is(.resource-card, .guide-public-card) h3 {
  margin: 0;
  font-size: 1.15rem;
  line-height: 1.35;
}
html:root body[data-page="resources"] :is(.resource-card, .guide-public-card) > p {
  flex: 1;
  font-size: .85rem;
  line-height: 1.65;
}
html:root body[data-page="resources"] :is(.resource-card > div:last-child, .guide-public-card-footer) {
  width: 100%;
  margin-top: auto !important;
  padding-top: .35rem;
}
html:root body[data-page="resources"] .learn-faq { background: var(--paper-warm); }
html:root body[data-page="resources"] .learn-faq-heading h2 { font-size: clamp(1.6rem, 2.7vw, 2rem); line-height: 1.4; }
html:root body[data-page="resources"] .faq-list { max-width: 54rem; border-top: 1px solid var(--line-strong); }
html:root body[data-page="resources"] .faq-question { min-height: 4.75rem; font-weight: 600; }
html:root body[data-page="resources"] .learn-cta .cta-banner-inner { box-shadow: none; }

/* Community: tab bar, search tools and calm discussion rows. */
html:root body[data-page="forum"] .forum-wrap,
html:root .thread-wrap { max-width: 70rem; }
html:root body[data-page="forum"] .forum-toolbar {
  grid-template-columns: 1fr;
  gap: 1.25rem;
  align-items: stretch;
  padding: 0 0 1.25rem;
  border-bottom-color: var(--line);
}
html:root body[data-page="forum"] .forum-tabs {
  display: flex;
  gap: .25rem;
  width: fit-content;
  padding: .3rem;
  border: 1px solid var(--line);
  border-radius: .65rem;
  background: var(--paper-warm);
}
html:root body[data-page="forum"] .forum-tab {
  min-height: 2.6rem;
  padding: .55rem 1rem;
  border: 1px solid transparent;
  border-radius: .45rem;
  background: transparent;
  color: var(--muted);
  font-size: .8rem;
}
html:root body[data-page="forum"] .forum-tab:hover {
  border-color: transparent;
  background: var(--paper);
  color: var(--ink);
}
html:root body[data-page="forum"] .forum-tab.active {
  border-color: var(--line);
  background: var(--paper);
  color: var(--brand-strong);
}
html:root body[data-page="forum"] .forum-filter-form {
  grid-template-columns: minmax(12rem, 1fr) minmax(10rem, 14rem) auto;
  align-items: end;
}
html:root body[data-page="forum"] .forum-filter-form :is(input, select, .btn) {
  min-height: 2.9rem;
  height: 2.9rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--control-radius);
  background-color: var(--paper);
  color: var(--ink);
  box-shadow: none;
}
html:root body[data-page="forum"] .forum-filter-form select { padding: .6rem 2.25rem .6rem .8rem; }
html:root body[data-page="forum"] .forum-sort-status { grid-column: 1; margin: 0; }
html:root body[data-page="forum"] :is([data-thread-list], [data-pinned-list]) { border-top: 0; }
html:root body[data-page="forum"] .thread-card {
  min-height: 7.5rem;
  padding: 1.5rem .75rem;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}
html:root body[data-page="forum"] .thread-card:hover { background: var(--paper-warm); transform: none; }
html:root body[data-page="forum"] .thread-card h3 { font-size: 1.05rem; line-height: 1.5; }
html:root body[data-page="forum"] .thread-meta { margin-top: .5rem; }
html:root :is(.compose-card, .reply-card, .thread-main) { border-color: var(--line); background: var(--paper); box-shadow: none; }
html:root :is(.login-prompt, .interaction-login-prompt) {
  border-color: var(--line);
  border-radius: var(--control-radius);
  background: var(--paper-warm);
}
html:root :is(.thread-main, .post-card) :is(.thread-category, .thread-badge) { background: var(--brand-soft); color: var(--brand-strong); }
html:root :is(.vote-button, .post-action-button, .collapse-replies) {
  border-color: var(--line);
  background: var(--paper);
  color: var(--ink-soft);
}
html:root :is(.vote-button, .post-action-button):hover { border-color: var(--brand); background: var(--brand-soft); }
html:root .post-card { border: 1px solid var(--line); background: var(--paper); box-shadow: none; }
html:root :is(.forum-empty, .guide-public-empty) { color: var(--muted); }

/* Practice library and its real study states. Correct/incorrect colors remain semantic. */
html:root body[data-page="practice"] .prac-page-header {
  padding-block: clamp(3rem, 5.5vw, 5rem) 2.5rem;
  background: var(--canvas);
}
html:root body[data-page="practice"] .prac-page-header h1 { max-width: 20ch; font-size: clamp(2.5rem, 4.7vw, 4rem); line-height: 1.08; }
html:root body[data-page="practice"] .subjects-controls { max-width: 54rem; }
html:root body[data-page="practice"] .subjects-search { box-shadow: none; }
html:root body[data-page="practice"] .wrongbank-btn { border-color: var(--line-strong); background: var(--paper); color: var(--brand-strong); }
html:root body[data-page="practice"] .wrongbank-btn:hover { border-color: var(--brand); background: var(--brand-soft); color: var(--brand-strong); }
html:root body[data-page="practice"] .subjects-grid {
  gap: 1rem;
  overflow: visible;
  border: 0;
  border-radius: 0;
}
html:root body[data-page="practice"] .subject-card,
html:root body[data-page="practice"] .subject-card:nth-child(n):not(:last-child),
html:root body[data-page="practice"] .subject-card:last-child {
  min-height: 10rem;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: .75rem;
  background: var(--paper);
  box-shadow: none;
}
html:root body[data-page="practice"] .subject-card:hover { border-color: var(--brand); background: var(--paper); transform: none; }
html:root body[data-page="practice"] .subject-icon { background: var(--brand-soft) !important; color: var(--brand-strong) !important; }
html:root body[data-page="practice"] :is(.detail-hero, .wrongbank-hero) { border-bottom-color: var(--line); background: var(--paper-warm); }
html:root body[data-page="practice"] .wrongbank-hero::before { display: none; }
html:root body[data-page="practice"] :is(.detail-title, .detail-subtitle, .wrongbank-hero h1) { color: var(--ink); }
html:root body[data-page="practice"] :is(.detail-back-btn, .wrongbank-back-btn) { color: var(--brand-strong); }
html:root body[data-page="practice"] .wrongbank-hero p { color: var(--muted); }
html:root body[data-page="practice"] :is(.detail-card, .question-card, .completion-wrapper, .wrongbank-item) { border-color: var(--line); box-shadow: none; }
html:root body[data-page="practice"] :is(.mode-btn, .diff-option, .qcount-btn, .prac-btn) { border-radius: var(--control-radius); box-shadow: none; }
html:root body[data-page="practice"] :is(.mode-btn, .diff-option, .qcount-btn) { background: var(--paper); color: var(--ink-soft); }
html:root body[data-page="practice"] :is(.mode-btn, .diff-option, .qcount-btn):is(.selected, .active) { border-color: var(--brand); background: var(--brand); color: var(--on-brand); }
html:root body[data-page="practice"] .prac-btn-primary,
html:root body[data-page="practice"] .prac-btn-primary:hover { color: var(--on-brand); box-shadow: none; }
html:root body[data-page="practice"] .option-btn:not(.locked):not(.state-correct):not(.state-wrong):not(.state-selected):hover { border-color: var(--brand); background: var(--brand-soft); }
html:root body[data-page="practice"] .option-btn.state-selected { border-color: var(--brand); background: var(--brand-soft); }
html:root body[data-page="practice"] .option-btn.state-selected .option-label { background: var(--brand); color: var(--on-brand); }
html:root body[data-page="practice"] .option-btn.state-correct { border-color: var(--correct); background: var(--correct-bg); }
html:root body[data-page="practice"] .option-btn.state-wrong { border-color: var(--wrong); background: var(--wrong-bg); }
html:root body[data-page="practice"] .option-btn.state-correct .option-label { background: var(--positive); color: var(--on-brand); }
html:root body[data-page="practice"] .option-btn.state-wrong .option-label { background: var(--danger); color: var(--on-brand); }
html:root body[data-page="practice"] :is(.feedback-box.fb-correct, .prog-badge.accuracy) { color: var(--positive); }
html:root body[data-page="practice"] :is(.feedback-box.fb-wrong, .prog-badge.wrong-cnt, .wrong-review-banner p) { color: var(--danger); }
html:root body[data-page="practice"] .feedback-box.fb-info { border-color: var(--line-strong); }
html:root body[data-page="practice"] :is(.explanation-box, .practice-topbar) { border-color: var(--line); background: var(--paper-warm); }
html:root body[data-page="practice"] .progress-bar-fill { background: var(--brand); }
html:root body[data-page="practice"] .completion-icon { border-color: var(--line-strong); background: var(--brand-soft); }
html:root body[data-page^="practice-"] .subject-page-hero { background: var(--canvas); }
html:root body[data-page^="practice-"] .subject-page-hero h1 { max-width: 22ch; line-height: 1.08; }
html:root body[data-page^="practice-"] .subject-stats { border-top: 1px solid var(--line-strong); }
html:root body[data-page^="practice-"] .subject-panel { border-color: var(--line); background: var(--paper); box-shadow: none; }
html:root body[data-page^="practice-"] .subject-topic-list { border-top: 1px solid var(--line); }
html:root body[data-page^="practice-"] .subject-related a:hover { background: var(--paper-warm); }

/* Help and volunteer forms: comfortable fields, helpful surrounding context. */
html:root body:is([data-page="join"], [data-page="volunteer"]) :is(.support-grid, .volunteer-grid) {
  grid-template-columns: minmax(15rem, .85fr) minmax(0, 1.5fr);
  gap: clamp(2rem, 6vw, 6rem);
}
html:root body:is([data-page="join"], [data-page="volunteer"]) .request-card { padding: clamp(1.5rem, 3.5vw, 2.75rem); background: var(--paper); }
html:root body:is([data-page="join"], [data-page="volunteer"]) .request-card > h3 { font-size: 1.5rem; }
html:root body:is([data-page="join"], [data-page="volunteer"]) :is(.support-overview-copy, .volunteer-overview) { border-top: 1px solid var(--line-strong); }
html:root body:is([data-page="join"], [data-page="volunteer"]) .opportunity-card { background: transparent; box-shadow: none; }
html:root body:is([data-page="join"], [data-page="volunteer"]) .opportunity-card h4 { font-size: 1rem; }
html:root body:is([data-page="join"], [data-page="volunteer"]) :is(input, select, textarea) {
  border: 1px solid var(--line-strong);
  border-radius: var(--control-radius);
  background: var(--canvas);
  color: var(--ink);
  box-shadow: none;
}
html:root body:is([data-page="join"], [data-page="volunteer"]) :is(input, select):not([type="checkbox"]):not([type="radio"]) { min-height: 3rem; }
html:root body:is([data-page="join"], [data-page="volunteer"]) textarea { min-height: 8rem; }
html:root body:is([data-page="join"], [data-page="volunteer"]) :is(input, select, textarea):focus { border-color: var(--brand); background: var(--paper); }
html:root body:is([data-page="join"], [data-page="volunteer"]) :is(input, select, textarea)[aria-invalid="true"] { border-color: var(--danger); }
html:root body:is([data-page="join"], [data-page="volunteer"]) .privacy-box { background: var(--paper-warm); }

/* Account and authentication use the same compact bordered form language. */
html:root body[data-page="account"] .page-hero { padding-block: 2.75rem; }
html:root body[data-page="account"] .account-card { border-color: var(--line); box-shadow: none; }
html:root body[data-page="account"] [data-view="login"] { max-width: 35rem; padding: clamp(1.5rem, 4vw, 2.5rem); }
html:root body[data-page="account"] .auth-tabs { gap: .35rem; margin-block: 1.5rem; padding: .3rem; border: 1px solid var(--line); border-radius: .65rem; background: var(--paper-warm); }
html:root body[data-page="account"] .auth-tab { padding: .6rem .8rem; border: 1px solid transparent; border-radius: .45rem; color: var(--muted); font-size: .82rem; }
html:root body[data-page="account"] .auth-tab.active { border-color: var(--line); background: var(--paper); color: var(--brand-strong); }
html:root body[data-page="account"] :is(input, select, textarea) { border-color: var(--line-strong); border-radius: var(--control-radius); background: var(--canvas); color: var(--ink); box-shadow: none; }
html:root body[data-page="account"] :is(input, select, textarea):focus { border-color: var(--brand); background: var(--paper); }
html:root body[data-page="account"] .account-dashboard-header { border-bottom: 1px solid var(--line); background: var(--paper-warm) !important; }
html:root body[data-page="account"] .account-dashboard-header :is(h2, h3, h4, p, .account-user-name) { color: var(--ink) !important; }
html:root body[data-page="account"] .account-dashboard-header .btn-outline { border-color: var(--line-strong); background: var(--paper); color: var(--ink); }
html:root body[data-page="account"] .account-dashboard-header .btn-outline:hover { border-color: var(--brand); background: var(--brand-soft); color: var(--brand-strong); }
html:root body[data-page="account"] .account-avatar { background: var(--brand) !important; color: var(--paper) !important; }
html:root body[data-page="account"] .account-menu { background: var(--canvas); }
html:root body[data-page="account"] .account-menu-tab { font-size: .84rem; }
html:root body[data-page="account"] .account-menu-tab.active { background: var(--brand-soft); color: var(--brand-strong); }
html:root body[data-page="account"] :is(.account-summary-card, .manage-section, .security-actions) { background: var(--canvas) !important; box-shadow: none; }
html:root body[data-page="account"] .account-quick-card { border-color: var(--line); box-shadow: none; }
html:root body[data-page="account"] .account-quick-card:hover { border-color: var(--brand); background: var(--paper-warm); box-shadow: none; transform: none; }
html:root body[data-page="account"] .hours-summary-card { background: var(--paper-warm) !important; }

/* Student organization, support details and the event calendar. */
html:root body[data-page="about"] .about-image { border: 1px solid var(--line); border-radius: var(--panel-radius); background: var(--brand-soft); }
html:root body[data-page="about"] .about-image blockquote { color: var(--brand-strong); }
html:root body[data-page="about"] :is(.values-grid, .team-grid) { gap: 1rem; border-top: 0; }
html:root body[data-page="about"] :is(.value-card, .team-card) { padding: 1.5rem; border: 1px solid var(--line); border-radius: .75rem; background: var(--paper); box-shadow: none; }
html:root body[data-page="about"] .team-avatar { background: var(--brand-soft) !important; color: var(--brand-strong) !important; }
html:root body[data-page="about"] .timeline { border-top: 1px solid var(--line-strong); }
html:root body[data-page="about"] .timeline-item { grid-template-columns: 7.5rem minmax(0, 1fr); gap: .5rem 1.5rem; }
html:root body[data-page="about"] .timeline-date { grid-row: 1 / span 2; }
html:root body[data-page="about"] .timeline-item p { grid-column: 2; font-size: 1rem; line-height: 1.8; }
html:root body[data-page="programs"] :is(.support-hero-note, .support-service-detail, .question-ledger, .comparison-table) { border-top-width: 1px; border-top-color: var(--line-strong); }
html:root body[data-page="programs"] :is(.support-service-accent, .support-process, .contribute-crosslink) { background: var(--paper-warm); }
html:root body[data-page="programs"] .support-jump { background: var(--paper); }
html:root body[data-page="programs"] .support-service-title h2 { max-width: 18ch; }
html:root body[data-page="updates"] :is(.calendar-card, .calendar-details) { border: 1px solid var(--line); background: var(--paper); box-shadow: none; }
html:root body[data-page="updates"] :is(.calendar-nav, .calendar-day) { border-color: var(--line); background: var(--paper); color: var(--ink); }
html:root body[data-page="updates"] .calendar-day:hover { background: var(--paper-warm); }
html:root body[data-page="updates"] .calendar-day.selected { border-color: var(--brand); background: var(--brand-soft); color: var(--brand-strong); }
html:root body[data-page="updates"] .calendar-day.today { border-color: var(--brand); }
html:root body[data-page="updates"] .calendar-day.today .calendar-day-number,
html:root body[data-page="updates"] .mobile-agenda-today { background: var(--brand); color: var(--on-brand); }
html:root body[data-page="updates"] .calendar-event { background: var(--brand-soft); color: var(--brand-strong); }
html:root body[data-page="updates"] .mobile-agenda-day { border-color: var(--line); background: var(--paper); box-shadow: none; }
html:root body[data-page="updates"] .mobile-agenda-day-header { border-color: var(--line); background: var(--paper-warm); }
html:root body[data-page="updates"] .mobile-agenda-day-date { color: var(--ink); }
html:root body[data-page="updates"] :is(.calendar-weekdays, .calendar-event-count, .agenda-date) { color: var(--muted); }
html:root body[data-page="updates"] .event-modal-card { border-color: var(--line); background: var(--paper); box-shadow: 0 20px 60px rgb(34 40 32 / .15); }

/* Reading pages and practical planning tools. */
html:root .guide-reader-hero { background: var(--canvas); }
html:root .guide-reader-toc { border-color: var(--line); background: var(--paper); }
html:root .guide-reader-toc a { border-left-color: var(--line); color: var(--muted); }
html:root .guide-reader-toc a.active { border-left-color: var(--brand); background: var(--brand-soft); color: var(--brand-strong); }
html:root .guide-reader-cta { border-color: var(--line); background: var(--paper-warm); }
html:root .guide-detail-state-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: .75rem; margin-top: 1.25rem; }
html:root :is(.guide-table, .example-table) th { background: var(--paper-warm); color: var(--ink); }
html:root :is(.guide-table, .example-table) td { color: var(--ink-soft); }
html:root .grade-table th { color: var(--ink); border-bottom-color: var(--line-strong); }
html:root .grade-table td { border-top-color: var(--line); }
html:root .example-table .result-row td { background: var(--paper-warm); }
html:root :is(.example-table .wt-col, .calc-result-card.wt .gpa-num) { color: var(--warning) !important; }
html:root :is(.col-label, .calc-wrap label, .calc-result-card .rlabel) { color: var(--ink-soft); line-height: 1.6; }
html:root .col-label { font-size: .8125rem; letter-spacing: 0; }
html:root .calc-wrap { padding: clamp(1.25rem, 4vw, 2rem); }
html:root .calc-wrap > p { color: var(--ink-soft) !important; }
html:root .calc-row :is(input, select) { min-width: 0; min-height: 2.75rem; font-size: 1rem; border-color: var(--line-strong); background: var(--paper); color: var(--ink); }
html:root .calc-column-labels { padding-right: 3rem; }
html:root .calc-wrap .remove-btn { min-width: 2.75rem; min-height: 2.75rem; padding: .5rem; color: var(--muted); }
html:root .calc-wrap .remove-btn:hover { color: var(--danger); background: var(--danger-soft); }
html:root .calc-wrap .btn-reset { min-height: 2.75rem; border-color: var(--line-strong); color: var(--ink-soft); background: var(--paper); }
html:root .calc-wrap .btn-add { min-height: 2.75rem; }
html:root .note-tag.ap { background: var(--warning-soft); color: var(--warning); }
html:root :is(.formula-box, .gpa-definition, .calc-container, .calc-result-card, .level-card, .highlight-box) { border-color: var(--line); background: var(--paper-warm); box-shadow: none; }
html:root :is(.formula-box, .calc-result-card) :is(h3, h4, .formula-label, .formula-eq, .result-value) { color: var(--brand-strong); }
html:root .calc-result-card.uw { background: var(--brand-soft); }
html:root .calc-result-card.uw .gpa-num,
html:root .example-table .uw-col { color: var(--brand-strong); }
html:root .note-tag.honors { background: var(--paper-warm); color: var(--brand-strong); }
html:root .honors-note { border-color: var(--line); background: var(--paper-warm); color: var(--ink-soft); }

/* Operations: neutral structure lets real statuses and school colors carry meaning. */
html:root body[data-page="admin"] { background: var(--canvas); }
html:root body[data-page="admin"] .admin-priority-rail { border: 1px solid var(--line); background: var(--brand-strong); box-shadow: none; }
html:root body[data-page="admin"] :is(.admin-priority-card small, .admin-priority-status) { color: var(--paper); }
html:root body[data-page="admin"] .admin-priority-grid { border-top-color: rgb(255 255 255 / .2); }
html:root body[data-page="admin"] .admin-priority-card { border-color: rgb(255 255 255 / .2); }
html:root body[data-page="admin"] :is(.admin-tabs, .admin-card, .admin-section-jump, .item-card) { border-color: var(--line); background: var(--paper); box-shadow: none; }
html:root body[data-page="admin"] :is(.admin-tab.active, .admin-subtab.active) { background: var(--brand-soft); color: var(--brand-strong); }
html:root body[data-page="admin"] :is(.admin-tab, .admin-subtab):not(.active):hover { background: var(--paper-warm); }
html:root body[data-page="admin"] :is(.ns-editor-card, .guide-editor-card, .ns-reference-card, .guide-settings-grid) { border-color: var(--line); background: var(--paper); box-shadow: none; }
html:root body[data-page="admin"] :is(.admin-modal-card, .ns-dialog-frame, .guide-dialog-frame) { border-color: var(--line); background: var(--paper); box-shadow: 0 24px 72px rgb(34 40 32 / .18); }
html:root body[data-page="admin"] :is(input, select, textarea):not([type="color"]) { border-color: var(--line-strong); background-color: var(--paper); color: var(--ink); box-shadow: none; }
html:root body[data-page="admin"] :is(input, select, textarea):focus { border-color: var(--brand); }
html:root body[data-page="admin"] .sched-day.selected { background: var(--brand-soft); color: var(--brand-strong); }

/* Semantic notices use foreground tokens so both appearance modes stay legible. */
html:root body .form-status[data-tone="info"] { border-color: var(--line-strong); background: var(--brand-soft); color: var(--brand-strong); }
html:root body .form-status[data-tone="success"] { border-color: var(--positive); background: var(--positive-soft); color: var(--positive); }
html:root body .form-status[data-tone="error"] { border-color: var(--danger); background: var(--danger-soft); color: var(--danger); }
html:root .form-status[data-tone="success"],
html:root .badge-success { color: var(--positive); }
html:root .form-status[data-tone="error"],
html:root .badge-announcement { color: var(--danger); }
html:root .badge-gold { color: var(--warning); }

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) body[data-page="practice"] {
    --correct: #9bc98d;
    --correct-bg: #2a3d2b;
    --correct-bd: #46694a;
    --wrong: #efa599;
    --wrong-bg: #432b28;
    --wrong-bd: #744940;
  }
}
html[data-theme="dark"] body[data-page="practice"] {
  --correct: #9bc98d;
  --correct-bg: #2a3d2b;
  --correct-bd: #46694a;
  --wrong: #efa599;
  --wrong-bg: #432b28;
  --wrong-bd: #744940;
}

@media (max-width: 68rem) {
  html:root body[data-page="resources"] .guide-desk-layout { grid-template-columns: minmax(12rem, .8fr) minmax(0, 2fr); gap: 2rem; }
  html:root body[data-page="resources"] :is(.guide-public-grid, .resource-grid) { grid-template-columns: 1fr; }
  html:root body[data-page="resources"] :is(.guide-public-card, .resource-card) { min-height: 0; }
  html:root body[data-page="forum"] .forum-tabs { flex-wrap: wrap; }
}

@media (max-width: 50rem) {
  html:root body:not([data-page="home"]) .page-hero { padding-block: 2.75rem; }
  html:root body:not([data-page="home"]) .page-hero h1 { font-size: clamp(2.15rem, 8vw, 3rem); }
  html:root body[data-page="resources"] .learn-hero-grid,
  html:root body[data-page="resources"] .guide-desk-layout { grid-template-columns: 1fr; gap: 2rem; }
  html:root body[data-page="resources"] .guide-desk-intro { position: static; }
  html:root body[data-page="resources"] .guide-desk-intro h2 br { display: none; }
  html:root body[data-page="resources"] .guide-desk-facts { display: flex; gap: 1.25rem; flex-wrap: wrap; }
  html:root body[data-page="resources"] .guide-desk-facts div { gap: .6rem; border: 0; }
  html:root body[data-page="resources"] .resource-finder-controls { padding: 1.15rem; }
  html:root body[data-page="resources"] .resource-refine-row { grid-template-columns: 1fr; }
  html:root body[data-page="resources"] :is(.guide-public-card, .resource-card) { padding: 1.25rem; }
  html:root body[data-page="forum"] .forum-tabs { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); width: 100%; }
  html:root body[data-page="forum"] .forum-tab { padding-inline: .65rem; }
  html:root body[data-page="forum"] .forum-filter-form { grid-template-columns: minmax(0, 1fr) auto; gap: .75rem; }
  html:root body[data-page="forum"] .forum-filter-field:first-child { grid-column: 1 / -1; }
  html:root body[data-page="forum"] .thread-card { padding-inline: .25rem; }
  html:root body[data-page="practice"] .subjects-grid { grid-template-columns: 1fr; }
  html:root body[data-page="practice"] .subject-card { min-height: 0; padding: 1.25rem; }
  html:root body:is([data-page="join"], [data-page="volunteer"]) :is(.support-grid, .volunteer-grid) { grid-template-columns: 1fr; gap: 2.5rem; }
  html:root body:is([data-page="join"], [data-page="volunteer"]) :is(.support-overview, .volunteer-overview) { position: static; }
  html:root body[data-page="account"] .account-dashboard { grid-template-columns: 1fr; }
  html:root body[data-page="account"] .account-menu { display: flex; gap: .35rem; overflow-x: auto; padding: .75rem; border-right: 0; border-bottom: 1px solid var(--line); }
  html:root body[data-page="account"] .account-menu-tab { width: auto; min-width: max-content; margin: 0; padding: .55rem .8rem; }
  html:root body[data-page="about"] :is(.values-grid, .team-grid) { grid-template-columns: 1fr; }
  html:root body[data-page="about"] .timeline-item { grid-template-columns: 1fr; gap: .5rem; }
  html:root body[data-page="about"] .timeline-date { grid-row: auto; }
  html:root body[data-page="about"] .timeline-item p { grid-column: 1; }
  html:root body[data-page="programs"] .support-service-title { position: static; }
}

@media (max-width: 35rem) {
  html:root body[data-page="practice"] .subjects-controls { grid-template-columns: 1fr; }
  html:root body[data-page="resources"] .resource-scope-options > * { flex: 1 1 40%; justify-content: center; }
  html:root body[data-page="account"] .auth-tab { padding-inline: .5rem; font-size: .76rem; }
  html:root body[data-page="account"] .account-dashboard-header { align-items: start; flex-wrap: wrap; padding: 1.25rem !important; }
  html:root body[data-page="about"] .team-card { grid-template-columns: 3rem minmax(0, 1fr); gap: 1rem; }
  html:root body[data-page="about"] .team-avatar { width: 3rem; height: 3rem; }
}

@media (prefers-reduced-motion: reduce) {
  html:root body:not([data-page="home"]) :is(.guide-public-card, .resource-card, .subject-card, .thread-card) { transition: none; }
}

/* A team card keeps its place while its portrait moves into the introduction. */
html:root body[data-page="about"] :is(.team-grid:not(.team-directory), .team-section-grid) {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 20rem), 1fr));
  gap: 1rem;
}
html:root body[data-page="about"] .team-profile-card {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0;
  height: 21.5rem;
  min-height: 21.5rem;
  min-width: 0;
  padding: 1.25rem;
  border: 1px solid var(--line);
  text-align: center;
  overflow: hidden;
}
html:root body[data-page="about"] .team-profile-card .team-profile-identity {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  gap: .75rem;
  flex: 0 0 8.5rem;
  min-width: 0;
}
html:root body[data-page="about"] .team-profile-card .team-avatar {
  display: grid;
  place-items: center;
  width: 4rem;
  height: 4rem;
  flex-shrink: 0;
  grid-row: auto;
  margin: 0;
  border: 0;
  border-radius: 50%;
  font-family: inherit;
  font-size: 1.4rem;
  line-height: 1;
}
html:root body[data-page="about"] .team-profile-name { min-width: 0; }
html:root body[data-page="about"] .team-profile-name h4 { margin: 0; font-size: 1.25rem; line-height: 1.4; letter-spacing: -.015em; }
html:root body[data-page="about"] .team-profile-name .role { margin: .35rem 0 0; color: var(--brand-strong); font-size: .9375rem; line-height: 1.5; }
html:root body[data-page="about"] .team-profile-body { position: relative; flex: 1; min-height: 0; margin: .75rem 0 1rem; }
html:root body[data-page="about"] :is(.team-profile-summary, .team-profile-bio) {
  position: absolute;
  inset: 0;
  overflow-y: auto;
  overflow-x: hidden;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
  overflow-wrap: anywhere;
}
html:root body[data-page="about"] .team-profile-summary p { margin: 0 0 .75rem; font-size: .9375rem; line-height: 1.75; }
html:root body[data-page="about"] .team-profile-summary :is(.team-position-list, .team-group-list) { justify-content: center; gap: .5rem; padding-top: .5rem; }
html:root body[data-page="about"] .team-profile-summary :is(.team-position-chip, .team-group-chip) { font-size: .8125rem; line-height: 1.5; }
html:root body[data-page="about"] .team-profile-bio { padding-right: .5rem; text-align: left; }
html:root body[data-page="about"] .team-profile-bio p { margin: 0; font-size: 1rem; line-height: 1.8; white-space: pre-line; }
html:root body[data-page="about"] .team-profile-toggle {
  display: block;
  width: fit-content;
  min-height: 2.75rem;
  flex-shrink: 0;
  align-self: center;
  padding: .6rem .2rem;
  border: 0;
  background: transparent;
  color: var(--brand-strong);
  font: inherit;
  font-size: .9375rem;
  font-weight: 600;
  line-height: 1.5;
  text-decoration: underline;
  text-underline-offset: .3em;
  cursor: pointer;
}
html:root body[data-page="about"] .team-profile-card[data-expanded="true"] { text-align: left; }
html:root body[data-page="about"] .team-profile-card[data-expanded="true"] .team-profile-identity { flex-direction: row; flex-basis: 5.25rem; align-items: center; }
html:root body[data-page="about"] .team-profile-card[data-expanded="true"] .team-avatar { width: 3.5rem; height: 3.5rem; font-size: 1.15rem; }
html:root body[data-page="about"] .team-profile-card[data-expanded="true"] .team-profile-toggle { align-self: flex-start; }
html:root body[data-page="about"] .team-section-grid .team-profile-card:nth-child(even) { border-right: 1px solid var(--line); }