:root {
  color-scheme: light;
  --bg: #f7f8fb;
  --paper: #ffffff;
  --soft: #edf4f2;
  --ink: #17202a;
  --muted: #5d6b78;
  --line: #d9e2ea;
  --accent: #0f766e;
  --accent-dark: #0b5f59;
  --warn: #9a3412;
  --shadow: 0 16px 42px rgba(23, 32, 42, 0.08);
  font-family: Inter, "Segoe UI", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  position: relative;
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
}

body::before {
  content: "E = mc\00B2\A S = \03C0 r\00B2\A F = ma\A P = UI\A a\00B2 + b\00B2 = c\00B2\A I = q / t";
  position: fixed;
  z-index: 0;
  top: 118px;
  right: max(-90px, calc((100vw - 1180px) / 2 - 120px));
  width: 520px;
  color: #0f766e;
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: 2.1rem;
  font-weight: 850;
  line-height: 1.9;
  opacity: 0.045;
  pointer-events: none;
  transform: rotate(-9deg);
  white-space: pre;
}

a {
  color: inherit;
  text-decoration-color: rgba(15, 118, 110, 0.35);
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--accent-dark);
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 3px solid var(--warn);
  outline-offset: 3px;
}

.site-header,
.site-footer,
.hero,
.page-head,
.section,
.breadcrumbs {
  position: relative;
  z-index: 1;
  width: min(1180px, calc(100% - 32px));
  margin-right: auto;
  margin-left: auto;
}

.site-header {
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 78px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  font-weight: 850;
  text-decoration: none;
}

.brand-logo {
  display: block;
  width: 110px;
  height: 44px;
  flex: 0 0 auto;
}

.brand-name {
  font-size: 1rem;
  letter-spacing: 0;
  white-space: nowrap;
}

.site-nav {
  position: relative;
  z-index: 60;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  font-weight: 700;
}

.site-nav a {
  text-decoration: none;
}

.nav-dropdown {
  position: relative;
}

.dropdown-toggle,
.nav-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  border: 0;
  border-radius: 8px;
  padding: 0 12px;
  background: #ffffff;
  color: var(--ink);
  font-weight: 750;
  line-height: 1;
  list-style: none;
  box-shadow: none;
  cursor: pointer;
}

.dropdown-toggle::after {
  content: "\25BE";
  margin-left: 6px;
  color: var(--muted);
  font-size: 0.78rem;
}

.nav-dropdown.show .dropdown-toggle,
.dropdown-toggle:hover,
.dropdown-toggle:focus-visible {
  background: rgba(15, 118, 110, 0.08);
  color: var(--accent-dark);
}

.dropdown-menu {
  position: absolute;
  z-index: 1000;
  top: calc(100% + 8px);
  left: 0;
  width: min(720px, calc(100vw - 32px));
  max-height: min(72vh, 680px);
  overflow: auto;
  border: 1px solid rgba(217, 226, 234, 0.82);
  border-radius: 8px;
  padding: 10px;
  background: rgba(255, 255, 255, 0.97);
  box-shadow: 0 18px 52px rgba(23, 32, 42, 0.14);
  backdrop-filter: blur(18px) saturate(1.2);
}

.dropdown-menu[hidden] {
  display: none;
}

.dropdown-menu-end {
  right: 0;
  left: auto;
}

.dropdown-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px 10px;
}

.dropdown-column,
.dropdown-submenu {
  display: grid;
  gap: 4px;
  align-content: start;
  min-width: 0;
}

.dropdown-column {
  gap: 6px;
}

.dropdown-item {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  min-height: 32px;
  border-radius: 7px;
  padding: 7px 8px;
  background: transparent;
  color: var(--ink);
  font-size: 0.94rem;
  font-weight: 650;
  line-height: 1.25;
  text-decoration: none;
}

.dropdown-item:hover,
.dropdown-item:focus-visible {
  background: rgba(15, 118, 110, 0.08);
  color: var(--accent-dark);
}

.dropdown-item-strong {
  font-weight: 780;
}

.dropdown-item small {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 650;
  white-space: nowrap;
}

.dropdown-submenu {
  padding-left: 6px;
}

.nav-loading {
  margin: 0;
  padding: 8px;
  color: var(--muted);
}

.nav-empty {
  margin: 0;
  padding: 8px;
  color: var(--muted);
}

.nav-menu {
  position: relative;
  z-index: 70;
}

.nav-menu summary {
  border-radius: 8px;
  padding: 6px 8px;
  cursor: pointer;
  list-style: none;
  white-space: nowrap;
}

.nav-menu[open] summary {
  background: rgba(15, 118, 110, 0.08);
  color: var(--accent-dark);
}

.nav-menu summary::-webkit-details-marker {
  display: none;
}

.nav-menu summary::after {
  content: "▾";
  margin-left: 5px;
  color: var(--muted);
  font-size: 0.78rem;
}

.nav-menu-panel {
  position: fixed;
  z-index: 1000;
  top: 78px;
  left: 50%;
  display: grid;
  grid-template-columns: repeat(3, minmax(220px, 1fr));
  gap: 14px;
  width: min(1120px, calc(100vw - 32px));
  max-height: calc(100vh - 104px);
  overflow: auto;
  border: 1px solid rgba(217, 226, 234, 0.72);
  border-radius: 8px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 18px 52px rgba(23, 32, 42, 0.14);
  backdrop-filter: blur(18px) saturate(1.2);
  transform: translateX(-50%);
}

.nav-collections-panel {
  grid-template-columns: repeat(3, minmax(230px, 1fr));
}

.nav-menu-group {
  min-width: 0;
}

.nav-subject-group,
.nav-menu-subgroup {
  display: grid;
  gap: 6px;
  align-content: start;
}

.nav-subject-group {
  gap: 12px;
}

.nav-subject-overview {
  margin-bottom: 2px;
}

.nav-menu-panel p {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 850;
  text-transform: uppercase;
}

.nav-menu-panel a {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  border-radius: 7px;
  padding: 7px 8px;
  color: var(--ink);
  line-height: 1.25;
  text-decoration: none;
}

.nav-menu-panel a:hover {
  background: rgba(15, 118, 110, 0.08);
  color: var(--accent-dark);
}

.nav-menu-panel span,
.nav-menu-panel small {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 650;
}

.nav-menu-panel a > span {
  min-width: 0;
  color: inherit;
}

.nav-menu-panel small {
  flex: 0 0 auto;
  white-space: nowrap;
}

.nav-overview-link {
  grid-column: 1 / -1;
  border: 1px solid rgba(15, 118, 110, 0.18);
  background: #f3faf8;
}

.nav-overview-link strong {
  color: var(--accent-dark);
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 460px);
  gap: 34px;
  align-items: end;
  padding: 72px 0 54px;
}

.hero::before {
  content: "x^2 - 5x + 6 = 0";
  position: absolute;
  top: 30px;
  left: 22%;
  color: #9a3412;
  font-size: 1rem;
  font-weight: 850;
  opacity: 0.16;
  transform: rotate(-4deg);
}

.hero h1,
.page-head h1 {
  max-width: 860px;
  margin: 0;
  font-size: clamp(3rem, 7vw, 6.6rem);
  line-height: 1.02;
}

.page-head {
  padding: 44px 0 28px;
}

.formula-page .page-head {
  padding: 30px 0 22px;
}

.formula-page .page-head h1 {
  max-width: 920px;
  font-size: clamp(2.1rem, 4.4vw, 4.25rem);
  line-height: 1.08;
}

.lead {
  max-width: 760px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 1.18rem;
}

.page-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.hero-visual {
  display: grid;
  gap: 14px;
}

.formula-wall {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.formula-wall a {
  display: grid;
  gap: 4px;
  min-height: 92px;
  border: 1px solid rgba(15, 118, 110, 0.22);
  border-radius: 8px;
  padding: 14px;
  background: rgba(255, 255, 255, 0.72);
  text-decoration: none;
  box-shadow: 0 10px 28px rgba(23, 32, 42, 0.05);
}

.formula-wall a:nth-child(3n) {
  border-color: rgba(154, 52, 18, 0.25);
}

.formula-wall[data-random-list] > :nth-child(n+6),
.home-random-grid[data-random-list] > :nth-child(n+7),
.popular-section-grid[data-random-list] > :nth-child(n+10),
.home-author-strip[data-random-list] > :nth-child(n+5),
[hidden] {
  display: none !important;
}

.formula-wall span {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 800;
  text-transform: uppercase;
}

.formula-wall strong {
  color: var(--ink);
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: 1.18rem;
  line-height: 1.2;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.hero-metrics span {
  display: grid;
  min-height: 76px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.62);
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.25;
}

.hero-metrics strong {
  color: var(--accent-dark);
  font-size: 1.1rem;
}

.button,
button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  border: 0;
  border-radius: 8px;
  padding: 0 18px;
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-weight: 750;
  text-decoration: none;
  cursor: pointer;
}

.button-secondary {
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
}

.search-panel,
.card,
.formula-row,
.formula-panel,
.calculator {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.search-panel {
  padding: 24px;
  box-shadow: var(--shadow);
}

.search-panel label,
.calculator label {
  display: grid;
  gap: 8px;
  font-weight: 750;
}

.search-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  margin-top: 10px;
}

.search-scopes {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  border: 0;
  padding: 0;
}

.search-scopes label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 34px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0 10px;
  background: #fbfcfd;
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 700;
}

.search-scopes input {
  width: auto;
  min-height: auto;
}

input {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 14px;
  color: var(--ink);
  font: inherit;
}

.section {
  padding: 50px 0;
}

.muted {
  width: 100%;
  padding-right: max(16px, calc((100% - 1180px) / 2));
  padding-left: max(16px, calc((100% - 1180px) / 2));
  background: var(--soft);
}

.section-heading {
  margin-bottom: 24px;
}

.section-note {
  max-width: 760px;
  margin: 8px 0 0;
  color: var(--muted);
}

.section h2,
.formula-panel h2,
.calculator h2 {
  margin: 0 0 16px;
  font-size: clamp(1.7rem, 3vw, 2.7rem);
  line-height: 1.1;
}

.grid {
  display: grid;
  gap: 16px;
}

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.structure-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 28px;
}

.structure-stats span,
.blueprint-meta span {
  display: grid;
  gap: 2px;
  min-height: 74px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: var(--paper);
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.25;
}

.structure-stats strong,
.blueprint-meta strong {
  color: var(--accent-dark);
  font-size: 1.1rem;
}

.blueprint-groups {
  display: grid;
  gap: 16px;
}

.blueprint-group {
  display: grid;
  gap: 18px;
}

.blueprint-list {
  display: grid;
  gap: 10px;
}

.blueprint-link {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  min-height: 76px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
  background: #fbfcfd;
  text-decoration: none;
}

.blueprint-link:hover {
  border-color: rgba(15, 118, 110, 0.36);
  background: #f3faf8;
}

.blueprint-link span {
  display: grid;
  gap: 3px;
}

.blueprint-link strong {
  line-height: 1.2;
}

.blueprint-link em {
  color: var(--muted);
  font-size: 0.92rem;
  font-style: normal;
  line-height: 1.35;
}

.blueprint-link small {
  align-self: start;
  border: 1px solid rgba(15, 118, 110, 0.22);
  border-radius: 999px;
  padding: 3px 8px;
  background: #f3faf8;
  color: var(--accent-dark);
  font-weight: 750;
  white-space: nowrap;
}

.blueprint-detail {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 430px);
  gap: 16px;
  align-items: start;
}

.blueprint-status-card {
  display: grid;
  gap: 14px;
}

.blueprint-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 8px;
}

.related-blueprint {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card {
  padding: 22px;
}

.card h3,
.formula-row h3 {
  margin: 0 0 8px;
  line-height: 1.2;
}

.card p,
.formula-row p {
  margin: 0;
  color: var(--muted);
}

.formula-card {
  display: grid;
  gap: 12px;
}

.home-updates-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.home-update-card {
  padding: 0;
  border-left: 4px solid var(--accent);
}

.home-update-card a {
  display: grid;
  gap: 9px;
  height: 100%;
  padding: 18px 20px;
  color: inherit;
  text-decoration: none;
}

.home-update-card h3 {
  margin-bottom: 0;
}

.home-update-type {
  color: var(--accent-dark);
  font-size: 0.76rem;
  font-weight: 850;
  text-transform: uppercase;
}

.home-update-card small {
  align-self: end;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 750;
}

.home-section-card {
  padding: 0;
}

.home-section-card a {
  display: grid;
  gap: 10px;
  height: 100%;
  padding: 22px;
  color: inherit;
  text-decoration: none;
}

.home-section-card strong {
  align-self: end;
  color: var(--accent-dark);
  font-size: 0.92rem;
}

.home-authors {
  overflow: hidden;
}

.home-author-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.home-author-card a {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 14px;
  align-items: center;
  height: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: var(--paper);
  color: inherit;
  text-decoration: none;
}

.home-author-image {
  margin: 0;
}

.home-author-image img,
.home-author-image.author-image-fallback {
  display: block;
  width: 100%;
  height: 50%;
  aspect-ratio: 1;
  border: 1px solid var(--line);
  border-radius: 8px;
  object-fit: cover;
}

.home-author-card span {
  display: grid;
  gap: 5px;
  min-width: 0;
}

.home-author-card strong {
  line-height: 1.15;
}

.home-author-card em {
  color: var(--muted);
  font-size: 0.86rem;
  font-style: normal;
}

.home-author-card small {
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 800;
}

.home-author-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.4;
}

.section-actions {
  margin-top: 18px;
}

.formula-list {
  display: grid;
  gap: 12px;
}

.pager {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 18px 0;
}

.pager a,
.pager span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 38px;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 12px;
  background: var(--paper);
  color: var(--ink);
  font-weight: 750;
  line-height: 1;
  text-decoration: none;
}

.pager a:hover {
  border-color: rgba(15, 118, 110, 0.45);
  background: rgba(15, 118, 110, 0.08);
  color: var(--accent-dark);
}

.pager [aria-current="page"] {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.formula-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(180px, 280px);
  gap: 18px;
  align-items: center;
  padding: 18px 20px;
}

.mini-math {
  overflow-x: auto;
  color: var(--accent-dark);
  font-size: 1.1rem;
  font-weight: 750;
}

.math-block {
  overflow-x: auto;
  padding: 26px;
  border-radius: 8px;
  background: #f9fbfd;
  color: var(--ink);
  font-size: 1.35rem;
}

.formula-panel {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px;
}

.formula-help-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.formula-help-button {
  min-height: 40px;
  padding-inline: 14px;
  font-size: 0.94rem;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.tags span {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 10px;
  background: var(--paper);
  color: var(--muted);
  font-weight: 700;
}

.tags a {
  border: 1px solid rgba(15, 118, 110, 0.28);
  border-radius: 999px;
  padding: 5px 10px;
  background: #f3faf8;
  color: var(--accent-dark);
  font-weight: 750;
  text-decoration: none;
}

.article-section {
  max-width: 860px;
}

.article-section p,
.card p + p {
  margin-top: 12px;
}

.check-list {
  display: grid;
  gap: 9px;
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
}

.formula-task {
  display: grid;
  gap: 10px;
}

.formula-task p {
  line-height: 1.55;
}

.formula-task strong {
  color: var(--ink);
}

.formula-visual {
  display: grid;
  gap: 14px;
  width: min(960px, 100%);
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  background: var(--paper);
}

.formula-visual figcaption {
  display: grid;
  gap: 4px;
}

.formula-visual figcaption span {
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 850;
  text-transform: uppercase;
}

.formula-visual figcaption strong {
  font-size: 1.2rem;
}

.formula-visual-body {
  overflow: auto;
  border-radius: 8px;
  background: #f9fbfd;
}

.formula-visual img,
.formula-visual svg {
  display: block;
  max-width: 100%;
  height: auto;
}

.steps {
  display: grid;
  gap: 10px;
  margin: 0;
  padding-left: 22px;
}

.steps li::marker {
  color: var(--accent-dark);
  font-weight: 850;
}

.tag-card {
  padding: 0;
}

.tag-card a {
  display: grid;
  gap: 8px;
  min-height: 100%;
  padding: 22px;
  text-decoration: none;
}

.author-search {
  max-width: 920px;
  margin-top: 28px;
}

.author-search output {
  display: grid;
  place-items: center;
  min-width: 58px;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  color: var(--accent-dark);
  font-weight: 850;
}

.authors-section {
  width: min(1400px, calc(100% - 32px));
}

.authors-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 18px;
  align-items: stretch;
}

.author-card {
  display: grid;
  grid-template-rows: auto auto auto auto 1fr;
  gap: 10px;
  align-items: start;
  min-height: 300px;
  height: 100%;
  padding: 0 0 16px;
  overflow: hidden;
}

.author-card-image,
.author-portrait,
.home-author-image {
  margin: 0;
}

.author-card-image {
  width: 100%;
}

.author-card-image img,
.author-portrait img,
.author-image-fallback {
  display: block;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  object-fit: cover;
}

.author-card-image img,
.author-card-image.author-image-fallback {
  width: 100%;
  height: 132px;
  min-height: 132px;
  aspect-ratio: auto;
  border: 0;
  border-radius: 0;
}

.author-card-image figcaption {
  display: none;
}

.author-card > .eyebrow,
.author-card > h3,
.author-card > p {
  min-width: 0;
  margin-right: 16px;
  margin-left: 16px;
}

.author-card-tags {
  gap: 6px;
  margin: 0 16px;
}

.author-card-tags a {
  padding: 4px 8px;
  font-size: 0.72rem;
  line-height: 1.15;
}

.author-card > .eyebrow {
  display: -webkit-box;
  overflow: hidden;
  margin-top: 2px;
  font-size: 0.78rem;
  line-height: 1.35;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 1;
}

.author-card h3 {
  font-size: 1.1rem;
  line-height: 1.18;
}

.author-card > p:last-child {
  display: -webkit-box;
  overflow: hidden;
  font-size: 0.92rem;
  line-height: 1.42;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

.author-card > p:last-child {
  margin-bottom: 0;
}

.author-empty {
  margin-top: 18px;
}

.author-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(340px, 430px);
  gap: 42px;
  align-items: center;
}

.author-portrait {
  width: min(430px, 100%);
  justify-self: end;
}

.author-portrait img,
.author-portrait.author-image-fallback {
  aspect-ratio: 1 / 1;
  box-shadow: var(--shadow);
}

.author-tags-preview .tags {
  margin-top: 0;
}

.author-tag-preview-card {
  display: grid;
  gap: 12px;
}

.author-image-fallback {
  display: grid;
  place-items: center;
  min-height: 100px;
  background:
    linear-gradient(135deg, rgba(15, 118, 110, 0.14), rgba(154, 52, 18, 0.1)),
    var(--paper);
  color: var(--accent-dark);
  font-size: 2rem;
  font-weight: 850;
}

.author-portrait.author-image-fallback {
  min-height: 420px;
  font-size: 4rem;
}

.author-mention {
  color: var(--accent-dark);
  font-weight: 750;
}

.author-bibliography ul {
  display: grid;
  gap: 10px;
  margin: 0;
  padding-left: 22px;
}

.attribution-card {
  display: grid;
  gap: 14px;
}

.author-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.author-links a {
  display: inline-grid;
  gap: 2px;
  min-width: 190px;
  border: 1px solid rgba(15, 118, 110, 0.26);
  border-radius: 8px;
  padding: 12px 14px;
  background: #f3faf8;
  color: var(--accent-dark);
  font-weight: 800;
  text-decoration: none;
}

.author-links span {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 650;
}

.class-note {
  max-width: 860px;
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
  background: var(--paper);
}

.class-note h3 {
  margin: 0 0 8px;
}

.class-note p {
  margin: 0;
  color: var(--muted);
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.formula-table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
  table-layout: fixed;
}

.formula-table th:nth-child(1),
.formula-table td:nth-child(1) {
  width: 24%;
}

.formula-table th:nth-child(2),
.formula-table td:nth-child(2) {
  width: 28%;
}

.formula-table th:nth-child(3),
.formula-table td:nth-child(3) {
  width: 18%;
}

.formula-table th:nth-child(4),
.formula-table td:nth-child(4) {
  width: 30%;
}

.formula-table th,
.formula-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  overflow-wrap: anywhere;
}

.formula-table th {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 850;
  text-transform: uppercase;
}

.formula-table tr:last-child td {
  border-bottom: 0;
}

.formula-notation {
  min-width: 0;
}

.formula-notation .table-math {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  white-space: nowrap;
}

.formula-code {
  display: block;
  max-width: 100%;
  border-radius: 7px;
  padding: 7px 8px;
  background: #f3faf8;
  color: var(--accent-dark);
  font-family: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.88rem;
  font-weight: 700;
  line-height: 1.45;
  white-space: normal;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.two-col {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 18px;
  align-items: start;
}

.variables {
  display: grid;
  gap: 10px;
  margin: 0;
}

.variables div {
  display: grid;
  grid-template-columns: minmax(96px, 170px) minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.variables dt {
  min-width: 0;
  color: var(--accent-dark);
  font-weight: 850;
}

.variables dd {
  min-width: 0;
  margin: 0;
  overflow-wrap: anywhere;
}

.variable-symbol-text {
  display: block;
  line-height: 1.28;
  overflow-wrap: anywhere;
}

.variable-symbol-math {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 2px;
}

.source-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 22px;
}

.calculator {
  display: grid;
  gap: 18px;
  padding: 24px;
}

.calc-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

output {
  display: block;
  min-height: 46px;
  border-radius: 8px;
  padding: 12px 14px;
  background: var(--soft);
  font-weight: 750;
}

.breadcrumbs {
  padding-top: 20px;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
  margin: 0;
  color: var(--muted);
  list-style: none;
}

.breadcrumbs li:not(:last-child)::after {
  content: "/";
  margin-left: 8px;
  color: #9aa6b2;
}

.site-footer {
  display: grid;
  grid-template-columns: minmax(220px, 360px) minmax(0, 1fr);
  justify-content: space-between;
  gap: 18px;
  padding: 32px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.site-footer p {
  margin: 0 0 6px;
}

.footer-links {
  display: grid;
  gap: 10px;
  justify-items: end;
}

.footer-links p {
  color: var(--ink);
  font-weight: 850;
}

.footer-links div {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.footer-links a {
  border: 1px solid rgba(15, 118, 110, 0.18);
  border-radius: 999px;
  padding: 5px 9px;
  background: rgba(255, 255, 255, 0.62);
  color: var(--accent-dark);
  font-size: 0.88rem;
  font-weight: 750;
  text-decoration: none;
}

.empty {
  color: var(--muted);
}

@media (max-width: 1120px) {
  .authors-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .site-header,
  .site-footer {
    align-items: flex-start;
    padding: 18px 0;
  }

  .site-header {
    flex-direction: column;
  }

  .site-footer {
    grid-template-columns: 1fr;
  }

  .footer-links {
    justify-items: start;
  }

  .footer-links div {
    justify-content: flex-start;
  }

  .hero,
  .grid-2,
  .grid-3,
  .structure-stats,
  .blueprint-detail,
  .blueprint-meta,
  .related-blueprint,
  .author-hero,
  .two-col,
  .formula-row {
    grid-template-columns: 1fr;
  }

  .home-updates-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .home-author-strip {
    grid-template-columns: 1fr;
  }

  .authors-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .nav-menu {
    width: 100%;
  }

  .nav-menu-panel {
    position: static;
    grid-template-columns: 1fr;
    width: 100%;
    max-height: none;
    margin-top: 8px;
    transform: none;
  }

  .dropdown-menu {
    position: fixed;
    inset: 76px 12px auto;
    left: 12px;
    width: auto;
    max-height: calc(100vh - 94px);
    transform: none;
  }

  .dropdown-grid {
    grid-template-columns: 1fr;
  }

  .author-portrait {
    justify-self: start;
  }

  .hero {
    padding-top: 44px;
  }

  .hero-metrics {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .search-row,
  .calc-grid,
  .variables div {
    grid-template-columns: 1fr;
  }

  .formula-wall {
    grid-template-columns: 1fr 1fr;
  }

  .home-updates-list {
    grid-template-columns: 1fr;
  }

  .home-author-strip {
    grid-template-columns: 1fr;
  }

  .home-author-card a {
    grid-template-columns: 78px minmax(0, 1fr);
  }

  .authors-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .blueprint-link {
    flex-direction: column;
  }

  .hero h1,
  .page-head h1 {
    font-size: 3rem;
  }

  .formula-page .page-head h1 {
    font-size: 2.35rem;
  }

  .author-card {
    display: grid;
  }

  .author-card-image {
    width: 100%;
  }
}

@media (max-width: 460px) {
  .authors-grid {
    grid-template-columns: 1fr;
  }
}