:root {
  color-scheme: light;
  --text: #202124;
  --muted: #5f6368;
  --light: #f8f9fa;
  --line: #e6e8eb;
  --blue: #276db7;
  --blue-soft: #eaf2fb;
  --green: #2f7d68;
  --green-soft: #eaf5f1;
  --orange: #a85f14;
  --orange-soft: #fff4e8;
  --purple: #6a5aa6;
  --purple-soft: #f0eef8;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, Arial, Helvetica, sans-serif;
  color: var(--text);
  background: #fff;
  font-size: 15px;
  line-height: 1.62;
}

a {
  color: var(--blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.page {
  width: min(1040px, calc(100% - 36px));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
}

.topbar .page {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 58px;
}

.brand {
  color: var(--text);
  font-size: 18px;
  font-weight: 800;
}

nav {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 14px;
  font-weight: 600;
}

nav a {
  color: var(--muted);
}

.intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 34px;
  align-items: center;
  padding: 46px 0 30px;
  border-bottom: 1px solid var(--line);
}

.intro h1 {
  margin: 0 0 6px;
  font-size: 42px;
  line-height: 1.1;
  letter-spacing: 0;
}

.intro h1 span {
  color: var(--muted);
  font-size: 28px;
  font-weight: 600;
}

.subtitle {
  margin: 0 0 22px;
  color: var(--green);
  font-weight: 800;
}

.intro p {
  max-width: 730px;
  margin: 12px 0;
  color: #35383b;
}

.link-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 18px;
}

.link-row a,
.link-row strong {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--light);
  font-size: 13px;
  font-weight: 700;
}

.link-row strong {
  color: var(--green);
  background: var(--green-soft);
}

.portrait-card {
  margin: 0;
  justify-self: end;
}

.portrait-card img {
  display: block;
  width: 230px;
  height: 230px;
  border: 1px solid var(--line);
  border-radius: 8px;
  object-fit: cover;
}

.section-block {
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
}

.section-block.compact {
  padding: 28px 0;
}

.section-title {
  margin-bottom: 18px;
}

.section-title h2 {
  margin: 0;
  font-size: 24px;
  line-height: 1.25;
}

.section-title p {
  margin: 6px 0 0;
  color: var(--muted);
}

.title-with-actions {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
}

.framework {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(248, 249, 250, 0.72), rgba(255, 255, 255, 1)),
    #fff;
}

.framework-row.labels {
  display: grid;
  grid-template-columns: 1fr 34px 1fr 34px 1fr;
  gap: 12px;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.framework-row.labels span:nth-child(1) {
  grid-column: 1;
}

.framework-row.labels span:nth-child(2) {
  grid-column: 3;
}

.framework-row.labels span:nth-child(3) {
  grid-column: 5;
}

.framework-row.systems {
  display: grid;
  grid-template-columns: 1fr 34px 1fr 34px 1fr;
  gap: 12px;
  align-items: stretch;
}

.system-card {
  min-height: 190px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.system2 {
  background: var(--blue-soft);
}

.system1 {
  background: var(--green-soft);
}

.system0 {
  background: var(--orange-soft);
}

.system-index {
  display: inline-flex;
  min-height: 26px;
  align-items: center;
  padding: 0 8px;
  border-radius: 4px;
  background: #fff;
  color: var(--text);
  font-size: 12px;
  font-weight: 800;
}

.system-card h3,
.two-column-list h3 {
  margin: 12px 0 8px;
  font-size: 18px;
  line-height: 1.25;
}

.system-card p,
.two-column-list p,
.two-column-list span,
.publication p {
  margin: 0;
  color: var(--muted);
}

.arrow {
  display: grid;
  place-items: center;
  color: var(--muted);
  font-size: 28px;
  font-weight: 700;
}

.feedback-band {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin: 14px 0;
  padding: 12px;
  border: 1px dashed #b8c9c2;
  border-radius: 8px;
  background: #fbfdfc;
}

.feedback-band span {
  text-align: center;
  color: var(--green);
  font-size: 12px;
  font-weight: 800;
}

.framework-bottom {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.framework-bottom article {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.framework-bottom h3 {
  margin: 0 0 6px;
  font-size: 16px;
}

.framework-bottom p {
  margin: 0;
  color: var(--muted);
}

.news-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.news-list li {
  display: grid;
  grid-template-columns: 86px minmax(0, 1fr);
  gap: 12px;
}

.news-list time {
  color: var(--green);
  font-weight: 800;
}

.filter-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-button {
  min-height: 32px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--light);
  color: var(--muted);
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
}

.filter-button.active {
  border-color: var(--green);
  background: var(--green);
  color: #fff;
}

.pub-list {
  display: grid;
  gap: 18px;
}

.publication {
  display: grid;
  grid-template-columns: 214px minmax(0, 1fr);
  gap: 20px;
  align-items: center;
}

.publication.is-hidden {
  display: none;
}

.publication img,
.pub-placeholder {
  width: 214px;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: 6px;
  object-fit: cover;
  background: var(--light);
}

.pub-placeholder {
  display: grid;
  place-items: center;
  color: var(--green);
  font-weight: 800;
  letter-spacing: 0.04em;
}

.publication h3 {
  margin: 0 0 6px;
  color: #174c84;
  font-size: 17px;
  line-height: 1.35;
}

.publication .authors {
  color: #3d4246;
}

.venue {
  margin-top: 5px;
  color: var(--text);
  font-weight: 600;
}

.pub-links {
  margin-top: 5px;
  font-size: 14px;
  font-weight: 700;
}

.placeholder-note {
  color: var(--orange);
}

.two-column-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 24px;
}

.two-column-list article {
  padding-left: 14px;
  border-left: 3px solid var(--green);
}

.two-column-list h3 {
  margin-top: 0;
}

.two-column-list p {
  font-weight: 700;
}

.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 26px 0 42px;
  color: var(--muted);
  font-size: 14px;
}

.footer p {
  margin: 0;
}

@media (max-width: 820px) {
  .topbar .page,
  .title-with-actions {
    align-items: flex-start;
    flex-direction: column;
  }

  nav {
    width: 100%;
    overflow-x: auto;
    gap: 14px;
    padding-bottom: 3px;
  }

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

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

  .framework-row.labels {
    display: none;
  }

  .framework-row.systems {
    grid-template-columns: 1fr;
  }

  .arrow {
    min-height: 22px;
    transform: rotate(90deg);
  }

  .feedback-band,
  .framework-bottom,
  .two-column-list {
    grid-template-columns: 1fr;
  }

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

  .publication img,
  .pub-placeholder {
    width: 100%;
  }
}

@media (max-width: 520px) {
  .page {
    width: min(100% - 28px, 1040px);
  }

  .intro h1 {
    font-size: 34px;
  }

  .intro h1 span {
    display: block;
    margin-top: 4px;
    font-size: 22px;
  }

  .portrait-card img {
    width: 190px;
    height: 190px;
  }

  .framework {
    padding: 14px;
  }

  .news-list li {
    grid-template-columns: 1fr;
    gap: 2px;
  }
}