:root {
  --bg: #f6f7f2;
  --bg-soft: #ffffffd9;
  --text: #1d2430;
  --muted: #5f6876;
  --line: #d0d6de;
  --accent: #1f9d74;
  --accent-soft: #d6f4e9;
  --shadow: 0 16px 48px #0f172a12;
  --font-main: "Avenir Next", "Segoe UI", "Noto Sans JP", sans-serif;
  --font-head: "IBM Plex Sans", "Avenir Next", sans-serif;
}

:root[data-theme="dark"] {
  --bg: #0f141b;
  --bg-soft: #111b25ed;
  --text: #e8edf2;
  --muted: #96a5b8;
  --line: #2a3a4a;
  --accent: #26c691;
  --accent-soft: #123b30;
  --shadow: 0 20px 48px #00000059;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-main);
  background: radial-gradient(circle at 10% -20%, #87c3b533 0%, transparent 44%),
    radial-gradient(circle at 90% -10%, #f2c68d2f 0%, transparent 42%),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.bg-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(150deg, #1f9d7414, transparent 33%, #1f9d7412 77%, transparent);
  z-index: -1;
}

.site-header {
  max-width: 1040px;
  margin: 1.2rem auto 0;
  padding: 1rem;
  display: grid;
  gap: 0.75rem;
  grid-template-columns: 1fr;
}

.brand {
  font: 700 1.1rem/1 var(--font-head);
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--text);
}

.tagline {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.site-nav {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.site-nav a,
.theme-toggle,
button {
  border: 1px solid var(--line);
  background: var(--bg-soft);
  color: var(--text);
  text-decoration: none;
  border-radius: 999px;
  font: 600 0.82rem/1 var(--font-main);
  padding: 0.5rem 0.78rem;
  cursor: pointer;
}

.site-nav a[aria-current="page"] {
  background: var(--accent-soft);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--line));
}

.theme-toggle {
  justify-self: start;
}

.content-wrap {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 1rem 2rem;
}

.panel {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 1.1rem;
  padding: 1.1rem;
  box-shadow: var(--shadow);
}

.panel-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
}

h1 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 1.26rem;
}

h2 {
  margin: 0.5rem 0;
  font-size: 1.02rem;
}

h2 a {
  color: inherit;
  text-decoration: none;
}

h2 a:hover {
  text-decoration: underline;
}

.muted {
  margin: 0.25rem 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.actions-row {
  display: flex;
  gap: 0.45rem;
}

.category-filters {
  margin-top: 0.9rem;
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.category-filters button[data-active="true"] {
  background: var(--accent-soft);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
}

.news-list {
  margin-top: 1rem;
  display: grid;
  gap: 0.9rem;
}

.news-card {
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  padding: 0.9rem;
  background: color-mix(in srgb, var(--bg-soft) 92%, transparent);
}

.news-card.is-read {
  opacity: 0.72;
}

.meta-line {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  align-items: center;
  margin: 0;
  font-size: 0.76rem;
  color: var(--muted);
}

.chip {
  background: var(--accent-soft);
  color: color-mix(in srgb, var(--text) 85%, var(--accent) 15%);
  border-radius: 999px;
  padding: 0.2rem 0.5rem;
  font-weight: 600;
}

ol {
  margin: 0.6rem 0 0;
  padding-left: 1.1rem;
  display: grid;
  gap: 0.36rem;
}

footer {
  margin-top: 0.8rem;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.is-saved {
  background: var(--accent-soft);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--line));
}

.archive-layout {
  margin-top: 1rem;
  display: grid;
  gap: 1rem;
}

.edition-list {
  display: flex;
  gap: 0.45rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
}

.edition-list button {
  display: grid;
  gap: 0.2rem;
  min-width: 122px;
  text-align: left;
}

@media (min-width: 860px) {
  .site-header {
    grid-template-columns: 1fr auto auto;
    align-items: center;
  }

  .theme-toggle {
    justify-self: end;
  }

  .archive-layout {
    grid-template-columns: 260px 1fr;
    align-items: start;
  }

  .edition-list {
    display: grid;
    max-height: 70vh;
    overflow-y: auto;
    overflow-x: hidden;
  }
}