:root {
  color-scheme: light;
  --ink: #1f2933;
  --muted: #526270;
  --paper: #f7fafc;
  --panel: #ffffff;
  --line: #d7e0e8;
  --blue: #1f5f8b;
  --green: #2f6f4e;
  --rose: #9a3d4f;
  --amber: #8b641f;
  --shadow: 0 14px 32px rgba(31, 41, 51, 0.1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Helvetica Neue", Arial, sans-serif;
  line-height: 1.5;
  letter-spacing: 0;
}

a {
  color: var(--blue);
}

.site-header {
  background: #ffffff;
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 56px 24px 44px;
}

.top-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 12px;
}

.eyebrow {
  margin: 0;
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.language-toggle {
  display: inline-flex;
  gap: 6px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f7fafc;
}

.language-button {
  min-height: 34px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--ink);
  padding: 0 10px;
  font: inherit;
  cursor: pointer;
}

.language-button:hover,
.language-button:focus-visible {
  outline: 2px solid rgba(31, 95, 139, 0.35);
  outline-offset: 1px;
}

.language-button.active {
  background: var(--blue);
  color: #ffffff;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  max-width: 820px;
  margin: 0;
  font-size: clamp(2.3rem, 5vw, 4.8rem);
  line-height: 1.02;
  letter-spacing: 0;
}

h2 {
  margin: 0 0 16px;
  font-size: 1.35rem;
}

h3 {
  margin: 0;
  font-size: 1.1rem;
}

.lead {
  max-width: 780px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 1.15rem;
}

main {
  max-width: 1120px;
  margin: 0 auto;
  padding: 28px 24px 56px;
}

.notice,
.contribution {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 8px;
  padding: 24px;
  box-shadow: var(--shadow);
}

.notice ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 24px;
  margin: 0;
  padding-left: 20px;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0 20px;
}

.filter-button {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  color: var(--ink);
  padding: 0 14px;
  font: inherit;
  cursor: pointer;
}

.filter-button:hover,
.filter-button:focus-visible {
  border-color: var(--blue);
  outline: none;
}

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

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  align-items: stretch;
}

.gallery-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.card-top {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 12px;
  align-items: start;
}

.card-visual {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  border-radius: 8px;
  color: #ffffff;
  font-size: 0.86rem;
  font-weight: 800;
}

.card-visual.activity {
  background: var(--green);
}

.card-visual.assessment {
  background: var(--rose);
}

.card-visual.assistant {
  background: var(--blue);
}

.card-visual.dataset {
  background: var(--amber);
}

.card-body {
  display: grid;
  gap: 11px;
  padding: 16px;
}

.card-section {
  margin: 0;
}

.card-section span {
  display: block;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
}

.card-section p {
  margin: 3px 0 0;
}

.resource-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 6px;
}

.resource-link {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  border: 1px solid rgba(31, 95, 139, 0.25);
  border-radius: 8px;
  padding: 5px 10px;
  background: #eef6fb;
  color: var(--blue);
  font-weight: 700;
  text-decoration: none;
}

.resource-link:hover,
.resource-link:focus-visible {
  border-color: var(--blue);
  outline: none;
}

.contribution {
  margin-top: 28px;
}

.contribution p {
  max-width: 760px;
  margin: 0 0 12px;
}

.contribution-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.primary-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  border-radius: 8px;
  background: var(--blue);
  color: #ffffff;
  padding: 7px 12px;
  font-weight: 700;
  text-decoration: none;
}

.secondary-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  border: 1px solid rgba(154, 61, 79, 0.28);
  border-radius: 8px;
  background: #fff3f5;
  color: var(--rose);
  padding: 7px 12px;
  font-weight: 700;
  text-decoration: none;
}

.primary-link:hover,
.primary-link:focus-visible,
.secondary-link:hover,
.secondary-link:focus-visible {
  outline: none;
}

.primary-link:hover,
.primary-link:focus-visible {
  background: #174966;
}

.secondary-link:hover,
.secondary-link:focus-visible {
  border-color: var(--rose);
  background: #ffffff;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 24px;
  color: var(--muted);
  text-align: center;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 980px) {
  .gallery-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .header-inner {
    padding: 40px 18px 32px;
  }

  .top-row {
    display: grid;
    gap: 14px;
  }

  .language-toggle {
    justify-self: start;
  }

  main {
    padding: 22px 18px 44px;
  }

  .notice ul {
    grid-template-columns: 1fr;
  }

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

  .filter-button {
    flex: 1 1 auto;
  }
}