:root {
  color-scheme: light;
  --font-sans: "Inter", "Noto Sans JP", "Helvetica Neue", Arial, sans-serif;
  --font-heading: "Manrope", "Inter", "Noto Sans JP", sans-serif;
  --color-bg: #f5f7fb;
  --color-surface: #ffffff;
  --color-surface-alt: #eef1f8;
  --color-text: #1f2937;
  --color-text-muted: #4b5563;
  --color-border: #d1d5db;
  --color-accent: #2563eb;
  --color-accent-strong: #1d4ed8;
  --color-positive: #047857;
  --color-warning: #b45309;
  --color-error: #dc2626;
  --color-focus: rgba(37, 99, 235, 0.35);
  --shadow-soft: 0 18px 36px -18px rgba(15, 23, 42, 0.35);
  --shadow-border: 0 0 0 1px rgba(15, 23, 42, 0.04);
  --radius-sm: 12px;
  --radius-md: 18px;
  --radius-lg: 24px;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --content-width: min(1080px, 92vw);
  --transition: 200ms ease;
  --line-height-body: 1.65;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --color-bg: #0b1120;
  --color-surface: #101a2b;
  --color-surface-alt: #16233a;
  --color-text: #eff6ff;
  --color-text-muted: #b7c4d6;
  --color-border: #1f2a3e;
  --color-accent: #60a5fa;
  --color-accent-strong: #3b82f6;
  --color-positive: #34d399;
  --color-warning: #fbbf24;
  --color-error: #f87171;
  --color-focus: rgba(96, 165, 250, 0.35);
  --shadow-soft: 0 18px 36px -18px rgba(3, 7, 18, 0.7);
  --shadow-border: 0 0 0 1px rgba(96, 165, 250, 0.15);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  line-height: var(--line-height-body);
  background: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  letter-spacing: 0.01em;
}

a {
  color: var(--color-accent-strong);
  text-decoration: underline;
  text-decoration-thickness: 0.12em;
  text-decoration-color: transparent;
  transition: color var(--transition), text-decoration-color var(--transition);
}

a:hover,
a:focus-visible {
  text-decoration-color: currentColor;
}

button,
select,
input {
  font: inherit;
  color: inherit;
}

button {
  border: none;
  background: none;
  cursor: pointer;
}

.skip-link {
  position: absolute;
  left: 50%;
  top: 0.75rem;
  transform: translateX(-50%);
  padding: 0.6rem 1.2rem;
  background: var(--color-accent-strong);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 600;
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.skip-link:focus {
  opacity: 1;
  pointer-events: auto;
}

.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.7));
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--color-border);
  z-index: 180;
  transition: background var(--transition), border-color var(--transition);
}

:root[data-theme="dark"] .site-header {
  background: linear-gradient(135deg, rgba(16, 26, 43, 0.95), rgba(16, 26, 43, 0.7));
}

.header-inner {
  width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-md) 0;
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.brand-area {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.brand-logo {
  font-size: 1.8rem;
}

.brand-copy {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.2rem;
}

.brand-tagline {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.site-nav__list {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin: 0;
  padding: 0;
}

.site-nav__list a {
  font-weight: 600;
  text-decoration: none;
  color: var(--color-text-muted);
  padding: 0.35rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.site-nav__list a:hover,
.site-nav__list a:focus-visible {
  color: var(--color-accent-strong);
  background: rgba(37, 99, 235, 0.12);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  font-weight: 600;
  transition: background var(--transition), border-color var(--transition);
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  border-color: var(--color-accent-strong);
}

.page-content {
  width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-xl) 0 var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(1.85rem, 2.6vw, 2.4rem);
  margin: 0 0 var(--space-sm);
}

.lead {
  margin: 0 0 var(--space-md);
  max-width: 55ch;
  color: var(--color-text-muted);
}

.hero-meta {
  display: flex;
  gap: var(--space-lg);
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
}

.hero-meta dt {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.hero-meta dd {
  margin: 0.15rem 0 0;
  font-size: 1rem;
  font-weight: 600;
}

.section-header {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.section-header h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 1.35rem;
}

.section-note {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  max-width: 60ch;
}

.resource-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.resource-grid {
  display: grid;
  gap: var(--space-md);
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.resource-card {
  padding: var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-border);
}

.resource-card h3 {
  margin: 0 0 var(--space-xs);
  font-family: var(--font-heading);
  font-size: 1.05rem;
}

.resource-card p {
  margin: 0 0 var(--space-sm);
  color: var(--color-text-muted);
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.metric-card {
  padding: var(--space-lg);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.metric-card__value {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.6rem;
}

.metric-card__label {
  font-size: 0.95rem;
  color: var(--color-text);
}

.metric-card__note {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.metric-summary {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  padding: 0;
  margin: var(--space-md) 0 0;
  list-style: none;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.filter-panel {
  padding: var(--space-lg);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.filters-form {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-md);
  align-items: end;
}

.filter-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.filter-field--search {
  grid-column: 1 / -1;
}

.filter-label {
  font-weight: 600;
  font-size: 0.9rem;
}

.filter-input,
.filter-select {
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  transition: border-color var(--transition), box-shadow var(--transition);
}

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

.filter-help {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.search-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.5rem;
}

.search-tags__placeholder {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.search-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: var(--color-surface-alt);
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
  font-size: 0.85rem;
}

.search-tag__remove {
  width: 1.1rem;
  height: 1.1rem;
  border-radius: 50%;
  background: var(--color-accent-strong);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  line-height: 1;
  padding: 0;
}

.filter-actions {
  display: flex;
  justify-content: flex-end;
}

.button {
  border-radius: var(--radius-sm);
  font-weight: 600;
  padding: 0.6rem 1.1rem;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

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

.button--secondary:hover,
.button--secondary:focus-visible {
  border-color: var(--color-accent-strong);
}

.button--secondary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.category-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.category-switch__button {
  padding: 0.5rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  font-weight: 600;
  background: var(--color-surface-alt);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.category-switch__button.is-active {
  background: var(--color-accent-strong);
  border-color: var(--color-accent-strong);
  color: #fff;
}

.category-switch__button:hover,
.category-switch__button:focus-visible {
  border-color: var(--color-accent-strong);
}

.results-summary {
  margin: 0;
  font-weight: 600;
  color: var(--color-text-muted);
}

.news-results {
.source-insights {
  padding: var(--space-lg);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.source-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.75rem;
}

.source-list__empty {
  margin: 0;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.source-item {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  grid-template-rows: auto auto;
  align-items: center;
  gap: 0.1rem 0.75rem;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
}

.source-item__rank {
  grid-row: 1 / span 2;
  justify-self: center;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-accent-strong);
}

.source-item__name {
  font-weight: 600;
}

.source-item__category {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.source-item__count,
.source-item__share,
.source-item__trust {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.source-item__share,
.source-item__trust {
  justify-self: end;
}

@media (max-width: 720px) {
  .source-item {
    grid-template-columns: 2.8rem 1fr;
  }
}
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.news-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  min-height: 100%;
  transition: transform var(--transition), box-shadow var(--transition);
}

.news-card:is(:hover, :focus-within) {
  transform: translateY(-4px);
  box-shadow: 0 28px 45px -24px rgba(15, 23, 42, 0.35);
}

.news-card.is-hidden {
  display: none;
}

.news-card__header {
  display: flex;
  gap: var(--space-sm);
  align-items: flex-start;
}

.news-card__rank {
  font-family: var(--font-heading);
  font-weight: 700;
  min-width: 2.6rem;
  text-align: center;
  padding: 0.35rem 0.55rem;
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  color: var(--color-accent-strong);
  box-shadow: var(--shadow-border);
}

.news-card__headline {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.news-card__title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.45;
  text-decoration: none;
  color: var(--color-text);
}

.news-card__title:hover,
.news-card__title:focus-visible {
  color: var(--color-accent-strong);
  text-decoration: underline;
  text-decoration-color: currentColor;
}

.news-card__meta-top {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.news-card__badge {
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  font-weight: 700;
  color: #fff;
}

.news-card__badge--high {
  background: var(--color-error);
}

.news-card__badge--medium {
  background: var(--color-warning);
}

.news-card__badge--low {
  background: var(--color-positive);
}

.news-card__freshness {
  padding: 0.25rem 0.5rem;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.12);
  color: var(--color-accent-strong);
}

.news-card__score {
  font-weight: 600;
}

.news-card__body {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.news-card__summary {
  margin: 0;
  max-width: 45ch;
}

.news-card__taglist {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.news-card__tag {
  border-radius: 999px;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  font-size: 0.8rem;
  padding: 0.3rem 0.6rem;
}

.news-card__footer {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.news-card__details {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 0.75rem;
  margin: 0;
}

.news-card__details dt {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin: 0 0 0.25rem;
}

.news-card__details dd {
  margin: 0;
  font-size: 0.9rem;
}

.news-card__footer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: space-between;
  align-items: center;
}

.news-card__trust {
  position: relative;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  padding-left: 1.8rem;
}

.news-card__trust::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 1.5rem;
  height: 0.35rem;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.15);
  overflow: hidden;
}

.news-card__trust-bar {
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  height: 0.35rem;
  border-radius: 999px;
  width: calc(var(--trust-level, 0) * 1%);
  background: var(--color-accent-strong);
}

.news-card__cta {
  font-weight: 600;
  text-decoration: none;
  color: var(--color-accent-strong);
}

.news-card__cta:hover,
.news-card__cta:focus-visible {
  text-decoration: underline;
}

.news-empty {
  margin: 0;
  padding: var(--space-md);
  background: var(--color-surface-alt);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  text-align: center;
}

.additional-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.info-section {
  padding: var(--space-lg);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.info-highlight {
  margin: 0;
  padding: var(--space-sm);
  border-left: 4px solid var(--color-accent-strong);
  background: rgba(37, 99, 235, 0.08);
  border-radius: var(--radius-sm);
  color: var(--color-text);
}

.site-footer {
  margin: var(--space-xl) auto var(--space-lg);
  width: var(--content-width);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

:focus-visible {
  outline: 2px solid var(--color-accent-strong);
  outline-offset: 3px;
}

@media (max-width: 900px) {
  .header-inner {
    flex-wrap: wrap;
    gap: var(--space-md);
  }

  .site-nav__list {
    flex-wrap: wrap;
    gap: 0.6rem;
  }

  .filters-form {
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  }
}

@media (max-width: 720px) {
  .page-content {
    width: min(94vw, 100%);
    padding-top: var(--space-lg);
  }

  .header-inner {
    width: min(94vw, 100%);
  }

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

  .hero-meta {
    flex-direction: column;
    gap: 0.5rem;
  }

  .filters-form {
    grid-template-columns: 1fr;
  }

  .filter-actions {
    justify-content: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

.legacy-sources {
  margin-top: var(--space-lg);
}

.legacy-sources h2 {
  font-family: var(--font-heading);
}

.legacy-sources ul {
  margin: 0;
  padding-left: 1.25rem;
}