:root {
  color-scheme: light;
  --page-bg: #f3f5f7;
  --surface: #ffffff;
  --text: #1f2933;
  --muted: #667085;
  --border: #d8dee7;
  --accent: #1263a3;
  --accent-strong: #0b4f82;
  --accent-soft: #e8f2fb;
  --gold-soft: #fff4d8;
  --gold-text: #805500;
  --green-soft: #eaf6ef;
  --green-text: #226340;
  --shadow: 0 8px 24px rgba(24, 39, 75, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--page-bg);
  color: var(--text);
  font-family: Arial, "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  line-height: 1.7;
}

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

a:hover {
  text-decoration: underline;
}

button,
input,
select {
  font: inherit;
}

button {
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 8px;
  color: #fff;
  cursor: pointer;
  font-weight: 700;
  min-height: 40px;
  padding: 8px 14px;
}

button:hover {
  background: var(--accent-strong);
}

button[type="reset"] {
  background: #fff;
  color: var(--accent);
}

.visually-hidden {
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  height: 1px;
  overflow: hidden;
  position: absolute;
  white-space: nowrap;
  width: 1px;
}

.site-header {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
  padding: 26px 0 18px;
}

.header-inner {
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 360px);
  align-items: end;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
}

.site-title {
  color: var(--text);
  display: inline-block;
  font-size: 32px;
  font-weight: 800;
  line-height: 1.2;
}

.site-title:hover {
  text-decoration: none;
}

.subtitle,
.generated-at,
.section-heading p,
.search-summary {
  color: var(--muted);
}

.subtitle {
  margin: 6px 0 0;
}

.generated-at {
  font-size: 13px;
  margin: 12px 0 0;
}

.site-search {
  display: grid;
  gap: 8px;
  grid-template-columns: 1fr auto;
}

.site-search input,
.filter-panel input,
.filter-panel select {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  min-height: 40px;
  padding: 8px 10px;
  width: 100%;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.site-nav a {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 14px;
  font-weight: 700;
  padding: 7px 12px;
}

.site-nav a[aria-current="page"] {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.hero,
.page-section {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  padding: 22px 0 20px;
}

.hero h1 {
  font-size: 34px;
  line-height: 1.3;
  margin: 0;
  max-width: 780px;
}

.hero p:last-child {
  color: var(--muted);
  margin: 10px 0 0;
  max-width: 720px;
}

.page-section {
  padding: 10px 0 30px;
}

.section-heading {
  margin-bottom: 14px;
}

.section-heading h1,
.section-heading h2 {
  font-size: 24px;
  line-height: 1.35;
  margin: 0;
}

.section-heading p {
  margin: 4px 0 0;
}

.news-list {
  display: grid;
  gap: 16px;
}

.news-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 20px;
}

.news-card__meta,
.news-card__footer {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  align-items: center;
}

.news-card__footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
  justify-content: space-between;
  margin-top: 14px;
  padding-top: 14px;
}

.category,
.importance,
.published-at {
  display: inline-flex;
  align-items: center;
  font-size: 13px;
  font-weight: 700;
  line-height: 1;
}

.category,
.importance {
  border-radius: 999px;
  padding: 7px 10px;
}

.category {
  background: var(--accent-soft);
  color: var(--accent);
}

.category--ai {
  background: #eee9ff;
  color: #5b3aa4;
}

.category--security {
  background: #ffe8e8;
  color: #a73535;
}

.category--cloud {
  background: #e6f3ff;
  color: #1263a3;
}

.category--semiconductor {
  background: #e9f7ef;
  color: #247247;
}

.category--gadget {
  background: #fff0df;
  color: #986018;
}

.category--business {
  background: #edf0f5;
  color: #475467;
}

.category--law {
  background: #f4e7d5;
  color: #7b4f18;
}

.category--other {
  background: #f0f4f8;
  color: #52606d;
}

.importance {
  background: var(--gold-soft);
  color: var(--gold-text);
}

.published-at {
  color: var(--muted);
}

.news-title {
  font-size: 21px;
  line-height: 1.45;
  margin: 12px 0;
}

.summary .label {
  color: var(--muted);
  display: block;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 4px;
}

.summary p,
.reason p {
  margin: 0;
}

.reason {
  border-top: 1px solid var(--border);
  margin-top: 14px;
  padding-top: 12px;
}

.reason summary {
  color: var(--accent);
  cursor: pointer;
  font-weight: 700;
}

.reason p {
  margin-top: 8px;
}

.article-link {
  font-weight: 700;
}

.news-card--empty .news-title {
  margin-bottom: 0;
}

.filter-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow);
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(220px, 2fr) repeat(4, minmax(140px, 1fr));
  margin: 16px 0;
  padding: 16px;
}

.filter-panel label {
  display: grid;
  gap: 5px;
}

.filter-panel span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.filter-actions {
  display: flex;
  gap: 8px;
  grid-column: 1 / -1;
}

.search-summary {
  margin: 0 0 14px;
}

code {
  background: #eef1f4;
  border-radius: 4px;
  padding: 2px 5px;
}

@media (max-width: 860px) {
  .header-inner,
  .filter-panel {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 29px;
  }
}

@media (max-width: 560px) {
  .site-header,
  .hero,
  .page-section {
    width: min(100% - 24px, 1080px);
  }

  .site-title {
    font-size: 28px;
  }

  .site-search {
    grid-template-columns: 1fr;
  }

  .news-card {
    padding: 16px;
  }

  .news-title {
    font-size: 19px;
  }

  .filter-actions {
    flex-direction: column;
  }
}