:root {
  --ink: #0b0b0b;
  --paper: #ffffff;
  --muted: #666666;
  --line: #d9d9d9;
  --text: #333333;
  --text-soft: #555555;
  --card-bg: rgba(255, 255, 255, 0.82);
  --box-bg: rgba(255, 255, 255, 0.9);
  --max: 1120px;
}

:root[data-theme="dark"] {
  --ink: #f0f0f0;
  --paper: #1b1b1d;
  --muted: #9a9a9a;
  --line: #333335;
  --text: #cfcfcf;
  --text-soft: #aaaaaa;
  --card-bg: rgba(255, 255, 255, 0.06);
  --box-bg: rgba(255, 255, 255, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.55;
  transition:
    background-color 0.2s ease,
    color 0.2s ease;
}

body::before {
  position: fixed;
  inset: auto 0 0;
  z-index: -1;
  height: 68vh;
  background: url("/assets/wave.svg") right bottom / cover no-repeat;
  content: "";
  opacity: 0.45;
  pointer-events: none;
}

:root[data-theme="dark"] body::before,
:root[data-theme="dark"] .brand img {
  filter: invert(1);
}

a {
  color: inherit;
}

img {
  max-width: 100%;
}

.site-header,
.site-footer,
.resources-hero,
.resources-layout,
.article-main {
  width: min(100%, var(--max));
  margin-inline: auto;
}

.site-header {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 30px;
  align-items: center;
  padding: 28px 24px;
}

.brand {
  display: inline-flex;
  gap: 14px;
  align-items: center;
  width: max-content;
  color: var(--ink);
  font-weight: 800;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.brand img {
  width: 42px;
  height: 42px;
  object-fit: contain;
}

.site-header nav {
  display: flex;
  gap: 28px;
}

.site-header nav a {
  color: var(--ink);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
}

.site-header nav a:hover,
.site-header nav a[aria-current="page"] {
  border-bottom: 1px solid var(--ink);
}

.theme-toggle {
  display: inline-flex;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.theme-icon {
  width: 18px;
  height: 18px;
  background: var(--ink);
  mask: url("/assets/theme-moon.png") center / contain no-repeat;
}

:root[data-theme="dark"] .theme-icon {
  mask-image: url("/assets/theme-sun.png");
}

.resources-hero {
  padding: 90px 24px 76px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.32em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 900px;
  margin-bottom: 28px;
  font-size: clamp(48px, 7vw, 84px);
  line-height: 0.98;
  letter-spacing: -0.052em;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(31px, 4.8vw, 54px);
  line-height: 1.02;
  letter-spacing: -0.04em;
}

h3 {
  margin-bottom: 12px;
  font-size: 23px;
  line-height: 1.15;
}

p {
  color: var(--text);
  font-size: 18px;
}

.resources-hero p {
  max-width: 760px;
  margin-bottom: 0;
  font-size: 21px;
}

.resources-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 64px;
  padding: 72px 24px 110px;
}

.resources-layout > aside {
  min-width: 0;
}

.section-navigation {
  position: sticky;
  top: 28px;
  padding: 26px;
  border: 1px solid var(--line);
  background: var(--box-bg);
}

.section-navigation-title {
  margin-bottom: 18px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section-navigation ol {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.section-navigation li {
  border-top: 1px solid var(--line);
}

.section-navigation a {
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  color: var(--ink);
  font-size: 14px;
  text-decoration: none;
}

.section-navigation a:hover span {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.section-navigation small {
  color: var(--muted);
}

.resource-section + .resource-section,
.resource-section + .empty-state,
.empty-state + .resource-section {
  margin-top: 100px;
}

.section-heading {
  display: flex;
  gap: 30px;
  align-items: end;
  justify-content: space-between;
  margin-bottom: 36px;
}

.section-heading p {
  max-width: 700px;
  margin-bottom: 0;
}

.back-to-sections,
.text-link {
  flex: 0 0 auto;
  color: var(--ink);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-decoration: none;
  text-transform: uppercase;
}

.back-to-sections:hover,
.text-link:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.resource-grid,
.related-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}

.resource-card {
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--card-bg);
}

.resource-card-media {
  display: block;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: var(--box-bg);
}

.resource-card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.25s ease;
}

.resource-card:hover .resource-card-media img {
  transform: scale(1.025);
}

.resource-card-placeholder {
  display: grid;
  width: 100%;
  height: 100%;
  place-items: center;
  padding: 24px;
  background:
    linear-gradient(135deg, transparent 49%, var(--line) 49%, var(--line) 51%, transparent 51%),
    var(--box-bg);
}

.resource-card-placeholder span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-align: center;
  text-transform: uppercase;
}

.resource-card-body {
  padding: 24px;
}

.resource-meta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 13px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.resource-card h3 a,
.article-list h3 a {
  color: var(--ink);
  text-decoration: none;
}

.resource-card h3 a:hover,
.article-list h3 a:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.resource-card p {
  margin-bottom: 22px;
  color: var(--text-soft);
  font-size: 15px;
}

.article-list {
  border-top: 2px solid var(--ink);
}

.article-list article {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(220px, 1fr);
  column-gap: 30px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.article-list .resource-meta,
.article-list h3 {
  grid-column: 1;
}

.article-list p {
  grid-column: 2;
  grid-row: 1 / span 2;
  margin-bottom: 0;
  color: var(--text-soft);
  font-size: 15px;
}

.empty-state {
  padding: 70px;
  border: 1px solid var(--line);
  background: var(--box-bg);
}

.empty-state p {
  max-width: 680px;
  margin-bottom: 0;
}

.site-footer {
  display: flex;
  gap: 24px;
  justify-content: space-between;
  padding: 38px 24px 56px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.site-footer a {
  color: var(--muted);
}

.article-main {
  padding: 72px 24px 110px;
}

.article-main > article {
  max-width: 900px;
  margin-inline: auto;
}

.breadcrumbs {
  display: flex;
  gap: 10px;
  margin-bottom: 70px;
  color: var(--muted);
  font-size: 13px;
}

.breadcrumbs a {
  color: var(--muted);
}

.article-header {
  margin-bottom: 52px;
}

.article-header h1 {
  font-size: clamp(44px, 7vw, 78px);
}

.article-excerpt {
  max-width: 780px;
  margin-bottom: 26px;
  font-size: 22px;
}

.article-byline {
  display: flex;
  gap: 18px;
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.tag-list {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.tag-list li {
  padding: 6px 10px;
  border: 1px solid var(--line);
  color: var(--text-soft);
  font-size: 12px;
}

.article-cover {
  margin: 0 0 64px;
}

.article-cover img {
  display: block;
  width: 100%;
  max-height: 620px;
  object-fit: cover;
  border: 1px solid var(--line);
}

.article-content {
  max-width: 760px;
  margin-inline: auto;
}

.article-content h2 {
  margin-top: 70px;
  font-size: clamp(30px, 5vw, 48px);
}

.article-content h3 {
  margin-top: 45px;
  font-size: 27px;
}

.article-content p,
.article-content li {
  font-size: 18px;
}

.article-content p,
.article-content ul,
.article-content ol,
.article-content blockquote,
.article-content figure,
.article-content .video-frame,
.article-content .article-callout,
.article-content hr {
  margin-top: 0;
  margin-bottom: 30px;
}

.article-content ul,
.article-content ol {
  padding-left: 24px;
}

.article-content li + li {
  margin-top: 9px;
}

.article-content figure {
  margin-inline: 0;
}

.article-content figure img {
  display: block;
  width: 100%;
  border: 1px solid var(--line);
}

.article-content figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-size: 13px;
}

.article-content blockquote {
  padding: 28px 30px;
  border-left: 3px solid var(--ink);
  background: var(--box-bg);
}

.article-content blockquote p {
  margin-bottom: 12px;
  font-size: 21px;
}

.article-content blockquote cite {
  color: var(--muted);
  font-style: normal;
  font-size: 13px;
}

.article-callout {
  padding: 28px 30px;
  border: 1px solid var(--ink);
  background: var(--box-bg);
}

.article-callout strong {
  display: block;
  margin-bottom: 8px;
}

.article-callout p {
  margin-bottom: 0;
}

.article-content hr {
  border: 0;
  border-top: 1px solid var(--line);
}

.video-frame {
  position: relative;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  background: #000;
}

.video-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.related-resources {
  max-width: 1000px;
  margin: 110px auto 0;
  padding-top: 60px;
  border-top: 1px solid var(--line);
}

.related-resources h2 {
  max-width: 700px;
}

.button {
  display: inline-block;
  margin-top: 28px;
  padding: 15px 22px;
  border: 1px solid var(--ink);
  color: var(--ink);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-decoration: none;
  text-transform: uppercase;
}

.button.primary {
  background: var(--ink);
  color: var(--paper);
}

.error-state {
  width: min(calc(100% - 48px), 900px);
  margin: 70px auto 110px;
}

@media (max-width: 900px) {
  .resources-layout {
    grid-template-columns: 1fr;
  }

  .section-navigation {
    position: static;
  }

  .section-navigation ol {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 24px;
  }

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

  .article-list p {
    grid-column: 1;
    grid-row: auto;
  }
}

@media (max-width: 680px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .site-header nav {
    display: none;
  }

  .resources-hero {
    padding-top: 60px;
  }

  .resources-layout,
  .article-main {
    padding-top: 52px;
  }

  .resource-grid,
  .related-grid,
  .section-navigation ol {
    grid-template-columns: 1fr;
  }

  .section-heading,
  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .empty-state {
    padding: 34px 26px;
  }

  .breadcrumbs {
    margin-bottom: 45px;
  }
}