:root {
  color-scheme: dark;
  --bg: #07111f;
  --panel: rgba(13, 25, 43, 0.85);
  --panel-strong: #10233f;
  --text: #ecf4ff;
  --muted: #9db2cf;
  --line: rgba(157, 178, 207, 0.18);
  --accent: #66d9ef;
  --accent-2: #8b5cf6;
  --fresh: #4ade80;
  --older: #fbbf24;
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(102, 217, 239, 0.16), transparent 30%),
    radial-gradient(circle at top right, rgba(139, 92, 246, 0.16), transparent 28%),
    var(--bg);
  color: var(--text);
}

.hero {
  padding: 72px 24px 36px;
}
.hero__content, main {
  width: min(1180px, calc(100vw - 32px));
  margin: 0 auto;
}
.eyebrow, .topic-card__eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.72rem;
  color: var(--accent);
}
h1 {
  font-size: clamp(2.6rem, 5vw, 4.8rem);
  line-height: 0.98;
  margin: 12px 0 16px;
}
.hero__lead {
  max-width: 760px;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.7;
}
.hero__meta {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 24px;
  color: var(--muted);
}
button {
  border: 1px solid rgba(102, 217, 239, 0.25);
  background: rgba(102, 217, 239, 0.14);
  color: var(--text);
  border-radius: 999px;
  padding: 10px 16px;
  font: inherit;
  cursor: pointer;
}
main {
  padding-bottom: 48px;
}
.summary {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}
.summary-card, .topic-card {
  background: var(--panel);
  backdrop-filter: blur(18px);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
}
.summary-card {
  padding: 22px;
}
.summary-card strong {
  display: block;
  font-size: 2rem;
  margin-bottom: 6px;
}
.summary-card span {
  color: var(--muted);
}
.summary-card--accent strong { color: var(--fresh); }
.summary-card--error { color: #fecaca; }
.topics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
.topic-card {
  padding: 22px;
}
.topic-card__header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 12px;
}
.topic-card h2 {
  margin: 8px 0 0;
  font-size: 1.55rem;
}
.topic-card__description,
.topic-card__empty,
.news-item__summary,
.news-item__source,
.topic-card__errors {
  color: var(--muted);
}
.badge {
  background: rgba(74, 222, 128, 0.16);
  color: var(--fresh);
  border: 1px solid rgba(74, 222, 128, 0.22);
  border-radius: 999px;
  padding: 8px 12px;
  font-size: 0.86rem;
  white-space: nowrap;
}
.topic-card__items {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}
.news-item {
  display: block;
  padding: 16px;
  border-radius: 18px;
  background: rgba(16, 35, 63, 0.88);
  border: 1px solid rgba(157, 178, 207, 0.12);
  color: inherit;
  text-decoration: none;
  transition: transform 0.16s ease, border-color 0.16s ease;
}
.news-item:hover {
  transform: translateY(-1px);
  border-color: rgba(102, 217, 239, 0.4);
}
.news-item__header,
.news-item__meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}
.news-item__header h3 {
  margin: 0;
  font-size: 1rem;
  line-height: 1.5;
}
.news-item__summary {
  margin: 12px 0;
  line-height: 1.6;
}
.news-item__age {
  color: var(--accent);
  font-size: 0.85rem;
  white-space: nowrap;
}
.news-item__meta {
  font-size: 0.86rem;
}
.news-item__fresh {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--older);
}
.topic-card__errors {
  margin-top: 16px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}
.topic-card__errors ul {
  padding-left: 18px;
}

@media (max-width: 900px) {
  .summary,
  .topics {
    grid-template-columns: 1fr;
  }
}