:root {
  --bg: #0b0e17;
  --bg-card: #141926;
  --border: #262d40;
  --text: #e6e9f0;
  --text-dim: #8891a7;
  --accent: #6ea8fe;
  --accent-dim: #2a3a5c;
  --favorite: #ffcc66;
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  background: var(--bg);
  color: var(--text);
  padding-bottom: 3rem;
}

.app-header {
  padding: 1.25rem 1rem 0.5rem;
  text-align: center;
}
.app-header h1 { margin: 0; font-size: 1.5rem; }
.tagline { margin: 0.25rem 0 0; color: var(--text-dim); font-size: 0.85rem; }

.login-banner {
  background: #3a2a1a;
  color: #ffd699;
  padding: 0.6rem 1rem;
  text-align: center;
  font-size: 0.85rem;
}
.login-banner a { color: var(--accent); }

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1rem;
}

.controls {
  position: sticky;
  top: 0;
  background: var(--bg);
  padding: 0.75rem 0;
  z-index: 10;
}

#search {
  width: 100%;
  padding: 0.6rem 0.8rem;
  border-radius: 0.6rem;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  font-size: 1rem;
}

.tabs {
  display: flex;
  gap: 0.4rem;
  margin-top: 0.6rem;
}
.tab {
  flex: 1;
  padding: 0.5rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-dim);
  font-size: 0.85rem;
}
.tab.active { background: var(--accent-dim); color: var(--text); border-color: var(--accent); }

.categories {
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
  margin-top: 0.6rem;
  padding-bottom: 0.2rem;
}
.category-chip {
  flex-shrink: 0;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-dim);
  font-size: 0.8rem;
  white-space: nowrap;
}
.category-chip.active { background: var(--accent-dim); color: var(--text); border-color: var(--accent); }

.article-list {
  list-style: none;
  margin: 0.5rem 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 0.9rem 1rem;
}
.article-card.is-read { opacity: 0.55; }

.article-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 0.35rem;
}

.title { margin: 0 0 0.35rem; font-size: 1.05rem; line-height: 1.4; }

.overview-badge {
  display: inline-block;
  font-size: 0.65rem;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  border-radius: 999px;
  padding: 0.1rem 0.5rem;
  margin-bottom: 0.35rem;
}

.summary { margin: 0 0 0.5rem; font-size: 0.9rem; color: var(--text-dim); line-height: 1.5; }

.toggle-original {
  background: none;
  border: none;
  color: var(--accent);
  font-size: 0.8rem;
  padding: 0;
  margin-bottom: 0.5rem;
  cursor: pointer;
}

.tags { display: flex; flex-wrap: wrap; gap: 0.3rem; margin-bottom: 0.6rem; }
.tag {
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  background: var(--accent-dim);
  color: var(--text-dim);
}

.actions { display: flex; align-items: center; gap: 0.6rem; flex-wrap: wrap; }
.actions button, .actions a {
  font-size: 0.8rem;
  padding: 0.4rem 0.7rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  text-decoration: none;
  cursor: pointer;
}
.btn-favorite[aria-pressed="true"] { color: var(--favorite); border-color: var(--favorite); }
.btn-read[aria-pressed="true"] { color: var(--accent); border-color: var(--accent); }
.btn-open { margin-left: auto; }

.empty-state, .load-more {
  display: block;
  width: 100%;
  text-align: center;
  color: var(--text-dim);
  padding: 1rem;
  background: transparent;
  border: 1px dashed var(--border);
  border-radius: 0.6rem;
  margin-top: 0.75rem;
}

@media (min-width: 600px) {
  .app-header h1 { font-size: 1.8rem; }
}