:root {
  --color-background: #ffffff;
  --color-surface: #f6f6f4;
  --color-text: #222222;
  --color-muted: #707070;
  --color-line: #e4e4e1;
  --color-accent: #1d4d4f;
  --color-ink: #24104f;
  --color-ai-background: #dce8dc;
  --content-width: 1080px;
  --reading-width: 680px;
  --font-display: Georgia, "Times New Roman", serif;
  --font-body: Arial, Helvetica, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--color-text);
  background: var(--color-background);
  font-family: var(--font-body);
  line-height: 1.65;
}

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

.site-header__inner,
.site-main,
.site-footer {
  width: min(calc(100% - 48px), var(--content-width));
  margin: 0 auto;
}

.site-header__inner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding: 12px 0;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  text-decoration: none;
}

.site-brand__portrait {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  object-fit: contain;
  object-position: center;
  background: var(--color-ai-background);
}

.bookmark-card__category,
.bookmark-card__date {
  color: var(--color-muted);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.site-main {
  padding: 8px 0 48px;
}

.intro {
  max-width: var(--reading-width);
  margin-bottom: 0;
}

h1,
h2 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.15;
}

h1 {
  margin: 0;
  font-size: clamp(2.25rem, 6vw, 4rem);
}

.section-title {
  margin: 0 0 12px;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 400;
  line-height: 1.15;
}

.category-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--color-line);
}

.category-nav__button {
  padding: 8px 14px;
  border: 1px solid var(--color-line);
  border-radius: 0;
  color: var(--color-text);
  background: var(--color-background);
  font: inherit;
  font-size: 0.875rem;
  cursor: pointer;
}

.category-nav__button:hover,
.category-nav__button:focus-visible,
.category-nav__button.is-active {
  border-color: var(--color-accent);
  color: #ffffff;
  background: var(--color-accent);
}

.bookmark-grid {
  display: grid;
  grid-template-columns: minmax(0, 720px);
  gap: 2px;
}

.bookmark-card {
  display: flex;
  min-height: 0;
  flex-direction: column;
  padding: 0;
  background: transparent;
}

.bookmark-card__category,
.bookmark-card__date {
  margin: 0;
  font-size: 0.68rem;
}

.bookmark-card__description {
  display: none;
  color: var(--color-muted);
}

.bookmark-card__date {
  display: none;
}

.bookmark-card__button {
  display: inline-flex;
  width: 33%;
  min-width: 220px;
  max-width: 280px;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  padding: 2px 8px;
  border: 1px solid var(--color-line);
  border-radius: 6px;
  color: #111111;
  background: #ffffff;
  box-shadow: 0 3px 0 #c8c8c4, 0 5px 10px rgb(0 0 0 / 12%);
  font-family: var(--font-display);
  font-size: clamp(1rem, 1.5vw, 1.25rem);
  font-weight: 700;
  line-height: 1.2;
  text-align: left;
  text-decoration: none;
  cursor: pointer;
  transition: border-color 150ms ease, background-color 150ms ease, box-shadow 150ms ease, transform 150ms ease;
}

.bookmark-card__button:hover,
.bookmark-card__button:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-ink);
  background: #e2ecff;
  box-shadow: 0 4px 0 var(--color-accent), 0 7px 14px rgb(36 16 79 / 20%);
}

.bookmark-card__button:focus-visible {
  outline: 2px solid var(--color-ink);
  outline-offset: 2px;
}

.bookmark-card__button:hover {
  transform: translateY(-2px);
}

.bookmark-card__button:active {
  transform: translateY(2px);
  box-shadow: 0 1px 0 var(--color-accent), 0 2px 4px rgb(36 16 79 / 15%);
}

.bookmark-card__mark {
  display: grid;
  width: 30px;
  height: 30px;
  flex: 0 0 30px;
  place-items: center;
  color: #ffffff;
  background: var(--color-ink);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 700;
}

.bookmark-card__mark.is-fallback {
  display: none;
}

.bookmark-card__logo {
  width: 30px;
  height: 30px;
  flex: 0 0 30px;
  object-fit: contain;
}

.status-message {
  color: var(--color-muted);
}

.site-footer {
  padding: 24px 0 40px;
  border-top: 1px solid var(--color-line);
  color: var(--color-muted);
  font-size: 0.8rem;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 700px) {
  .site-header__inner {
    display: block;
  }

  .site-brand__portrait {
    width: 80px;
    height: 80px;
  }

  .site-main {
    padding-top: 8px;
  }

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

@media (max-width: 520px) {
  .site-header__inner,
  .site-main,
  .site-footer {
    width: min(calc(100% - 32px), var(--content-width));
  }

  .category-nav__button {
    flex: 1 1 auto;
  }
}