:root {
  --bg: #eef3f8;
  --surface: #ffffff;
  --surface-strong: #ffffff;
  --surface-soft: #f5f8fc;
  --text: #14395b;
  --muted: #5e7286;
  --line: #d8e2ec;
  --accent: #005ea8;
  --accent-dark: #0d3f6f;
  --highlight: #0f79c8;
  --shadow: 0 14px 28px rgba(20, 57, 91, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Source Sans 3", sans-serif;
  color: var(--text);
  background:
    linear-gradient(180deg, rgba(0, 94, 168, 0.07), transparent 200px),
    var(--bg);
}

.page-shell {
  width: min(1280px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 36px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 22px;
  padding: 24px 26px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #ffffff;
  box-shadow: var(--shadow);
}

.eyebrow,
.section-kicker {
  margin: 0 0 8px;
  font-family: "Source Sans 3", sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-dark);
}

h1,
h2,
h3 {
  margin: 0;
  font-family: "Source Sans 3", sans-serif;
  line-height: 1.08;
}

h1 {
  max-width: 780px;
  font-size: clamp(2rem, 4vw, 3.45rem);
  font-weight: 700;
}

h2 {
  font-size: clamp(1.35rem, 2vw, 2rem);
  font-weight: 700;
}

p {
  margin: 0;
  line-height: 1.6;
}

.lead {
  font-size: 1.08rem;
  color: var(--text);
}

.topbar-subtitle {
  max-width: 680px;
  margin-top: 14px;
  color: var(--muted);
  font-size: 1.02rem;
}

.language-switcher {
  display: inline-flex;
  padding: 6px;
  border-radius: 999px;
  background: #f3f7fb;
  border: 1px solid var(--line);
}

.lang-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 10px 16px;
  border-radius: 999px;
  font-family: "Source Sans 3", sans-serif;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition: 0.2s ease;
}

.lang-btn.active {
  background: var(--accent-dark);
  color: #fff;
}

.three-column-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  align-items: start;
}

.panel {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.panel::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 5px;
  background: linear-gradient(180deg, var(--accent), rgba(0, 94, 168, 0.2));
}

.panel-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 18px;
  height: 100%;
  padding: 26px;
}

.panel-publications .panel-content,
.panel-websites .panel-content {
  gap: 20px;
}

.panel-cover .panel-content {
  gap: 0;
}

.cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 4px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 18px;
  border-radius: 10px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.button.primary {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), #0d6fbd);
  box-shadow: 0 10px 22px rgba(0, 94, 168, 0.18);
}

.button.secondary {
  color: var(--text);
  background: var(--surface-strong);
  border: 1px solid var(--line);
}

.meta-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  padding-top: 6px;
}

.meta-grid div {
  padding: 16px;
  border-radius: 12px;
  background: var(--surface-soft);
  border: 1px solid var(--line);
}

.meta-grid dt {
  margin-bottom: 6px;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.meta-grid dd {
  margin: 0;
  font-weight: 700;
}

.resources-note {
  color: var(--muted);
}

.resource-list-column {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 12px;
}

.resource-item {
  display: grid;
  gap: 16px;
  padding: 16px;
  border-radius: 14px;
  background: var(--surface-soft);
  border: 1px solid var(--line);
}

.resource-copy {
  display: grid;
  gap: 6px;
}

.resource-title {
  font-weight: 700;
  font-size: 1.04rem;
}

.resource-description {
  color: var(--muted);
}

.resource-link {
  justify-self: start;
  text-align: center;
  color: #fff;
  background: linear-gradient(135deg, var(--highlight), #0c67ae);
  box-shadow: none;
}

.cover-row {
  display: grid;
  grid-template-columns: minmax(260px, 360px) 1fr;
  gap: 28px;
  align-items: stretch;
}

.cover-book {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-areas:
    "masthead"
    "visual";
  align-content: start;
  gap: 18px;
  padding: 18px;
  border-radius: 14px;
  background: linear-gradient(180deg, #edf6fd 0%, #e3f0fb 100%);
  border: 1px solid rgba(0, 94, 168, 0.14);
}

.cover-book__masthead {
  grid-area: masthead;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
}

.cover-book__edition {
  margin: 0;
  font-size: 0.92rem;
  color: var(--accent-dark);
}

.cover-book__visual {
  grid-area: visual;
  display: flex;
  justify-content: center;
  padding: 6px 0 0;
}

.cover-book__visual img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 10px;
  box-shadow: 0 16px 30px rgba(20, 57, 91, 0.14);
}

.cover-info {
  display: grid;
  align-content: center;
  gap: 18px;
}

.cover-book__copy {
  display: grid;
  gap: 10px;
}

.cover-book__subtitle {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-dark);
}

.panel-publications h2,
.panel-websites h2 {
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.panel-cover .lead {
  padding-top: 4px;
}

@media (max-width: 640px) {
  .page-shell {
    width: min(100% - 18px, 1280px);
    padding-top: 18px;
  }

  .topbar {
    flex-direction: column;
    align-items: stretch;
  }

  .language-switcher {
    align-self: flex-start;
  }

  .panel-content {
    padding: 22px;
  }

  .resource-item {
    gap: 14px;
  }

  .resource-link {
    width: 100%;
    justify-self: stretch;
  }

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

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

  .cover-book {
    grid-template-columns: 1fr;
    grid-template-areas:
      "masthead"
      "visual";
  }

  .cover-book__masthead {
    flex-direction: column;
    align-items: flex-start;
  }
}