* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #fafaf9;
  --bg-card: #ffffff;
  --text: #1c1917;
  --text-secondary: #78716c;
  --border: #e7e5e4;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --tag-bg: #eff6ff;
  --tag-text: #1e40af;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-hover: 0 4px 16px rgba(0,0,0,0.08);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.logo {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.nav {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  flex: 1;
  -ms-overflow-style: none;
  scrollbar-width: none;
}
.nav::-webkit-scrollbar { display: none; }

.nav-btn {
  padding: 6px 14px;
  border: none;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  background: transparent;
  color: var(--text-secondary);
  white-space: nowrap;
  transition: all 0.15s;
}

.nav-btn:hover {
  background: var(--tag-bg);
  color: var(--accent);
}

.nav-btn.active {
  background: var(--accent);
  color: #fff;
}

.refresh-btn {
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--bg-card);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all 0.15s;
  flex-shrink: 0;
}

.refresh-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.refresh-btn.spinning svg {
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* Main */
.main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px;
}

.status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.count {
  font-weight: 600;
  color: var(--accent);
}

/* Grid */
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}

/* Card */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
  box-shadow: var(--shadow);
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  gap: 10px;
  cursor: pointer;
}

.card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.card-source {
  display: flex;
  align-items: center;
  gap: 8px;
}

.source-tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: var(--tag-bg);
  color: var(--tag-text);
}

.source-tag.bbc { background: #fef2f2; color: #b91c1c; }
.source-tag.npr { background: #f0f9ff; color: #0369a1; }
.source-tag.verge { background: #fdf4ff; color: #a21caf; }
.source-tag.36kr { background: #ecfdf5; color: #047857; }
.source-tag.sspai { background: #fffbeb; color: #b45309; }

.card-date {
  font-size: 0.72rem;
  color: var(--text-secondary);
}

.card-title {
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-desc {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.card-link {
  font-size: 0.78rem;
  color: var(--accent);
  font-weight: 500;
  text-decoration: none;
  align-self: flex-start;
}

.card-link:hover { text-decoration: underline; }

/* Loading */
.loading {
  text-align: center;
  padding: 60px 0;
  color: var(--text-secondary);
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin: 0 auto 12px;
}

/* Error */
.error {
  text-align: center;
  padding: 40px 20px;
  color: #b91c1c;
  background: #fef2f2;
  border-radius: var(--radius);
}

/* Footer */
.footer {
  text-align: center;
  padding: 32px 24px;
  font-size: 0.78rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border);
  margin-top: 40px;
}

/* Empty */
.empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-secondary);
}

.empty-icon { font-size: 2.5rem; margin-bottom: 12px; }

/* Responsive */
@media (max-width: 640px) {
  .header-inner { padding: 10px 14px; gap: 12px; }
  .main { padding: 16px; }
  .news-grid { grid-template-columns: 1fr; }
  .card { padding: 16px; }
}