:root {
  color-scheme: light dark;
  --font-body: "Noto Sans JP", "ヒラギノ角ゴ ProN", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  --font-mono: "Fira Code", "Source Code Pro", monospace;
}

html {
  box-sizing: border-box;
  font-size: 16px;
}

*,
*::before,
*::after {
  box-sizing: inherit;
}

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--color-background);
  color: var(--color-text);
  line-height: 1.6;
  transition: background-color 200ms ease, color 200ms ease;
}

[data-theme="light"] {
  --color-background: #f5f7fa;
  --color-surface: #ffffff;
  --color-border: #d4d9e2;
  --color-text: #1d2733;
  --color-subtext: #4a5568;
  --color-accent: #5062ff;
  --color-accent-soft: rgba(80, 98, 255, 0.1);
}

[data-theme="dark"] {
  --color-background: #12141a;
  --color-surface: #1d212c;
  --color-border: #2c3240;
  --color-text: #e3e7f2;
  --color-subtext: #a0accb;
  --color-accent: #7f9cff;
  --color-accent-soft: rgba(127, 156, 255, 0.12);
}

main,
header,
footer {
  width: min(1120px, 94vw);
  margin: 0 auto;
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  padding: 2.5rem 0 1.5rem;
  gap: 1.5rem;
}

.header-text h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 2.8rem);
}

.header-text p {
  margin: 0.5rem 0 0;
  color: var(--color-subtext);
}

.theme-switcher label {
  font-size: 0.9rem;
  color: var(--color-subtext);
}

.theme-switcher select {
  margin-left: 0.5rem;
  padding: 0.4rem 0.6rem;
  border-radius: 0.4rem;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
}

.intro {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 1rem;
  padding: 1.5rem;
  margin-bottom: 2rem;
  box-shadow: 0 12px 24px rgba(15, 22, 37, 0.08);
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.section-header h2 {
  margin: 0;
  font-size: 1.35rem;
}

.section-toggle {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  cursor: pointer;
  font-size: 0.85rem;
  transition: background-color 160ms ease;
}

.section-toggle:hover {
  background: var(--color-accent-soft);
}

.section-body[hidden] {
  display: none;
}

.intro a {
  color: var(--color-accent);
  text-decoration: none;
}

.intro a:hover {
  text-decoration: underline;
}

.controller {
  margin-bottom: 2.5rem;
}

.filters {
  display: grid;
  gap: 1.8rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  align-items: stretch;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 1rem;
  padding: 1.8rem;
}

.filters fieldset {
  border: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.filters legend {
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.field label {
  font-size: 0.85rem;
  color: var(--color-subtext);
}

.field input,
.field select {
  padding: 0.55rem 0.75rem;
  border-radius: 0.5rem;
  border: 1px solid var(--color-border);
  background: var(--color-background);
  color: var(--color-text);
  transition: border-color 160ms ease;
}

.field input:focus,
.field select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-soft);
}

.actions {
  display: flex;
  align-items: flex-end;
}

.actions button {
  padding: 0.6rem 1.4rem;
  border-radius: 999px;
  border: 1px solid var(--color-accent);
  background: transparent;
  color: var(--color-accent);
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease;
}

.actions button:hover {
  background: var(--color-accent);
  color: #fff;
}

.tag-cloud {
  margin-bottom: 2.5rem;
}


.link-list h2 {
  margin: 0 0 1rem;
  font-size: 1.35rem;
}

.tag-cloud__body {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 1rem;
  padding: 1rem;
}

.tag-cloud__body button {
  border: none;
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  background: var(--color-background);
  color: var(--color-text);
  cursor: pointer;
  font-size: 0.85rem;
  transition: transform 160ms ease, background-color 160ms ease;
}

.tag-cloud__body button:hover {
  transform: translateY(-1px);
  background: var(--color-accent-soft);
}

.tag-cloud__body button.is-active {
  background: var(--color-accent);
  color: #fff;
}

.link-list__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.2rem;
}

.link-card {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 1rem;
  padding: 1.2rem;
  min-height: 220px;
  transition: border-color 160ms ease, transform 160ms ease;
}

.link-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-accent);
}

.link-card__header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.link-card__icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--color-background);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.link-card__icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.link-card__title {
  margin: 0;
  font-size: 1.05rem;
}

.link-card__badge {
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-subtext);
}

.link-card__description {
  flex: 1;
  margin: 0;
  color: var(--color-subtext);
  font-size: 0.92rem;
}

.link-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.link-card__tags span {
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  background: var(--color-background);
  color: var(--color-subtext);
}

.link-card__actions a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--color-accent);
  text-decoration: none;
  font-size: 0.9rem;
}

.link-card__actions a::after {
  content: "↗";
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.6rem;
  margin: 2.5rem auto 3.5rem;
}

.page-control {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  border-radius: 0.6rem;
  padding: 0.5rem 0.8rem;
  cursor: pointer;
  min-width: 2.4rem;
  transition: background-color 160ms ease;
}

.page-control[disabled] {
  opacity: 0.4;
  cursor: not-allowed;
}

.page-control:not([disabled]):hover {
  background: var(--color-accent-soft);
}

.pagination__status {
  font-size: 0.9rem;
  color: var(--color-subtext);
}

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 1.8rem 0 2.4rem;
  text-align: center;
  color: var(--color-subtext);
  font-size: 0.85rem;
}

@media (max-width: 720px) {
  .filters {
    grid-template-columns: 1fr;
  }

  .link-list__grid {
    grid-template-columns: 1fr;
  }
}