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

:root {
  --bg: #080a12;
  --bg-card: #0f111b;
  --bg-card-hover: #161a28;
  --bg-elevated: #1a1e2e;
  --border: #1e2235;
  --border-hover: #2a2f45;
  --text: #e2e6f0;
  --text-secondary: #8b90a8;
  --text-muted: #555a72;
  --accent: #6c63ff;
  --accent-light: #8b85ff;
  --accent-gradient: linear-gradient(135deg, #6c63ff, #a855f7);
  --green: #22c55e;
  --green-bg: rgba(34, 197, 94, 0.12);
  --yellow: #eab308;
  --yellow-bg: rgba(234, 179, 8, 0.12);
  --red: #ef4444;
  --red-bg: rgba(239, 68, 68, 0.12);
  --orange: #f97316;
  --orange-bg: rgba(249, 115, 22, 0.12);
  --blue: #3b82f6;
  --blue-bg: rgba(59, 130, 246, 0.12);
  --pink: #ec4899;
  --pink-bg: rgba(236, 72, 153, 0.12);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-xs: 6px;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1400px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: var(--accent);
  color: white;
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8, 10, 18, 0.8);
  backdrop-filter: blur(24px) saturate(1.2);
  -webkit-backdrop-filter: blur(24px) saturate(1.2);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo {
  font-size: 1.15rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-decoration: none;
  letter-spacing: -0.5px;
  white-space: nowrap;
}

.nav-links {
  display: flex;
  gap: 2px;
  background: rgba(255, 255, 255, 0.03);
  padding: 3px;
  border-radius: var(--radius-sm);
}

.nav-link {
  background: none;
  border: none;
  color: var(--text-secondary);
  padding: 7px 14px;
  border-radius: 6px;
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
}

.nav-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.nav-link.active {
  color: var(--accent-light);
  background: rgba(108, 99, 255, 0.12);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.mobile-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-secondary);
  margin: 4px 0;
  border-radius: 2px;
  transition: all var(--transition);
}

/* Main */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 20px 48px;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Loading */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 20px;
  color: var(--text-secondary);
  gap: 16px;
}

.loading-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Skeleton */
.skeleton {
  background: linear-gradient(90deg, var(--bg-card) 25%, var(--bg-card-hover) 50%, var(--bg-card) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-card {
  height: 160px;
  margin-bottom: 12px;
  border-radius: var(--radius);
}

/* Digest Header */
.digest-header {
  margin-bottom: 28px;
  animation: fadeIn 0.4s ease;
}

.digest-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 8px;
}

.digest-date-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-weight: 600;
}

.digest-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1.2;
}

.digest-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.date-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.date-nav-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.8125rem;
  font-weight: 500;
  transition: all var(--transition);
  font-family: inherit;
}

.date-nav-btn:hover {
  border-color: var(--accent);
  color: var(--text);
  background: var(--bg-card-hover);
}

.date-nav-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

#datepicker {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-family: inherit;
  cursor: pointer;
}

#datepicker:focus {
  border-color: var(--accent);
  outline: none;
}

/* Stats bar */
.digest-stats {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.stat-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.78125rem;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.stat-chip:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.stat-chip strong {
  color: var(--text);
  font-weight: 600;
}

.stat-chip .stat-icon {
  width: 16px;
  height: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Section titles */
.section-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-title .count {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.04);
  padding: 2px 8px;
  border-radius: 10px;
  margin-left: auto;
}

/* Paper card */
.paper-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-bottom: 10px;
  transition: all var(--transition);
  cursor: pointer;
  animation: fadeIn 0.3s ease both;
  position: relative;
  overflow: hidden;
}

.paper-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: transparent;
  transition: background var(--transition);
}

.paper-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.paper-card:hover::before {
  background: var(--accent-gradient);
}

.paper-rank-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 24px;
  border-radius: 6px;
  font-size: 0.6875rem;
  font-weight: 700;
  padding: 0 6px;
  flex-shrink: 0;
}

.paper-rank-badge.top1 { background: linear-gradient(135deg, #f59e0b, #ef4444); color: #fff; }
.paper-rank-badge.top2 { background: linear-gradient(135deg, #94a3b8, #64748b); color: #fff; }
.paper-rank-badge.top3 { background: linear-gradient(135deg, #d97706, #b45309); color: #fff; }
.paper-rank-badge.reg { background: rgba(255,255,255,0.06); color: var(--text-muted); }

.paper-title-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 8px;
}

.paper-title {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
  flex: 1;
}

.paper-title a {
  color: inherit;
  text-decoration: none;
}

.paper-title a:hover {
  color: var(--accent-light);
}

.paper-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 8px;
}

.paper-tag {
  font-size: 0.6875rem;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 500;
  letter-spacing: 0.3px;
}

.paper-tag.source { text-transform: uppercase; }
.paper-tag.source-arxiv { background: rgba(59, 130, 246, 0.12); color: var(--blue); }
.paper-tag.source-huggingface { background: rgba(255, 153, 0, 0.12); color: #f90; }
.paper-tag.source-papers_with_code { background: rgba(34, 197, 94, 0.12); color: var(--green); }
.paper-tag.cat { background: rgba(255, 255, 255, 0.04); color: var(--text-muted); }
.paper-tag.score { background: rgba(108, 99, 255, 0.1); color: var(--accent-light); font-weight: 600; }
.paper-tag.new { background: var(--green-bg); color: var(--green); }
.paper-tag.date { color: var(--text-muted); font-size: 0.6875rem; }

.paper-authors {
  font-size: 0.78125rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.paper-abstract {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 10px;
}

.paper-links {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.paper-link {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  transition: all var(--transition);
  background: transparent;
  cursor: pointer;
  font-family: inherit;
}

.paper-link:hover {
  color: var(--text);
  border-color: var(--accent);
  background: rgba(108, 99, 255, 0.08);
}

.paper-link.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.paper-link.primary:hover {
  background: var(--accent-light);
  box-shadow: 0 2px 8px rgba(108, 99, 255, 0.3);
}

/* Summary (expandable) */
.paper-summary {
  background: rgba(108, 99, 255, 0.04);
  border-left: 3px solid var(--accent);
  padding: 14px 16px;
  margin-top: 12px;
  border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
  display: none;
  animation: fadeIn 0.3s ease;
  font-size: 0.8125rem;
  line-height: 1.7;
}

.paper-card.expanded .paper-summary {
  display: block;
}

.summary-text { color: var(--text); margin-bottom: 10px; }
.summary-keywords { color: var(--accent-light); }
.key-points { list-style: none; padding: 0; }
.key-points li {
  padding: 3px 0 3px 16px;
  position: relative;
  color: var(--text-secondary);
}
.key-points li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent-light);
}

/* News card */
.news-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 8px;
  transition: all var(--transition);
  animation: fadeIn 0.3s ease both;
}

.news-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
}

.news-source {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 3px;
}

.news-title {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 4px;
  line-height: 1.4;
}

.news-title a {
  color: var(--text);
  text-decoration: none;
}

.news-title a:hover {
  color: var(--accent-light);
}

.news-summary {
  font-size: 0.78125rem;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.5;
}

.news-meta {
  display: flex;
  gap: 6px;
  margin-top: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.news-tag {
  font-size: 0.625rem;
  padding: 2px 7px;
  border-radius: 4px;
  font-weight: 500;
  letter-spacing: 0.3px;
}

.news-tag.model_release { background: rgba(108, 99, 255, 0.12); color: var(--accent-light); }
.news-tag.research_breakthrough { background: var(--green-bg); color: var(--green); }
.news-tag.product_launch { background: var(--orange-bg); color: var(--orange); }
.news-tag.open_source_release { background: var(--blue-bg); color: var(--blue); }
.news-tag.funding_acquisition { background: var(--pink-bg); color: var(--pink); }
.news-tag.benchmark_result { background: var(--yellow-bg); color: var(--yellow); }
.news-tag.regulation_policy { background: var(--red-bg); color: var(--red); }

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn 0.2s ease;
}

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  max-width: 800px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  padding: 28px 32px;
  position: relative;
  animation: fadeIn 0.3s ease, slideUp 0.3s ease;
}

@keyframes slideUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: var(--bg-card-hover);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.modal-close:hover {
  color: var(--text);
  border-color: var(--accent);
}

/* Grid layout */
.grid-2col {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 28px;
  align-items: start;
}

@media (max-width: 1100px) {
  .grid-2col {
    grid-template-columns: 1fr;
  }
}

/* Categories */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
  margin-bottom: 28px;
}

.category-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  transition: all var(--transition);
}

.category-card:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
}

.category-card h3 {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.category-card .cat-count {
  font-size: 0.6875rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.category-paper {
  font-size: 0.75rem;
  padding: 4px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  color: var(--text-secondary);
  cursor: pointer;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: color var(--transition);
}

.category-paper:last-child { border-bottom: none; }

.category-paper:hover {
  color: var(--accent-light);
}

/* Search view */
.search-container {
  max-width: 700px;
  margin: 0 auto;
}

.search-box {
  position: relative;
  margin-bottom: 24px;
}

.search-box input {
  width: 100%;
  padding: 14px 18px 14px 44px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 1.05rem;
  font-family: inherit;
  transition: all var(--transition);
}

.search-box input:focus {
  border-color: var(--accent);
  outline: none;
  box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.15);
}

.search-box input::placeholder {
  color: var(--text-muted);
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1.1rem;
  pointer-events: none;
}

.search-results-count {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

/* Stats view */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  text-align: center;
  transition: all var(--transition);
}

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

.stat-value {
  font-size: 2rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.78125rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* Categories list in stats */
.cat-bar-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.cat-bar-item {
  display: flex;
  align-items: center;
  gap: 12px;
}

.cat-bar-label {
  font-size: 0.78125rem;
  color: var(--text-secondary);
  min-width: 80px;
  text-align: right;
}

.cat-bar-track {
  flex: 1;
  height: 8px;
  background: var(--bg-card-hover);
  border-radius: 4px;
  overflow: hidden;
}

.cat-bar-fill {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: 4px;
  transition: width 0.6s ease;
}

.cat-bar-count {
  font-size: 0.78125rem;
  color: var(--text-muted);
  min-width: 30px;
}

/* Error state */
.error-state {
  text-align: center;
  padding: 60px 20px;
  max-width: 500px;
  margin: 0 auto;
}

.error-state h2 {
  font-size: 1.3rem;
  margin-bottom: 8px;
  color: var(--text);
}

.error-state p {
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-size: 0.875rem;
  line-height: 1.6;
}

.error-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
  display: block;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  background: var(--accent-gradient);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
  text-decoration: none;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(108, 99, 255, 0.35);
}

.btn:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--bg-card-hover);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  color: var(--text);
  border-color: var(--accent);
  box-shadow: none;
  transform: none;
}

/* Filter bar */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 24px;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  animation: fadeIn 0.3s ease;
}

.filter-group {
  display: flex;
  gap: 4px;
  background: rgba(255, 255, 255, 0.03);
  padding: 3px;
  border-radius: var(--radius-sm);
}

.filter-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  padding: 5px 14px;
  border-radius: 5px;
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
  white-space: nowrap;
}

.filter-btn:hover {
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.04);
}

.filter-btn.active {
  color: var(--accent-light);
  background: rgba(108, 99, 255, 0.12);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.filter-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Toast */
#toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.toast {
  padding: 10px 18px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  color: var(--text);
  box-shadow: var(--shadow-lg);
  animation: toastIn 0.3s ease, toastOut 0.3s ease 2.7s;
  pointer-events: auto;
}

@keyframes toastIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateX(0); }
  to { opacity: 0; transform: translateX(100%); }
}

.toast.error { border-color: var(--red); }
.toast.success { border-color: var(--green); }

/* Footer */
.footer {
  text-align: center;
  padding: 32px 20px;
  color: var(--text-muted);
  font-size: 0.75rem;
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-links {
  margin-top: 8px;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--accent-light);
}

.footer-sep {
  margin: 0 8px;
  color: var(--border);
}

/* Section spacing */
.section { margin-bottom: 28px; }
.section:last-child { margin-bottom: 0; }

/* Empty state */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
}

.empty-state p {
  font-size: 0.875rem;
  margin-top: 8px;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: rgba(8, 10, 18, 0.98);
    backdrop-filter: blur(24px);
    flex-direction: column;
    padding: 8px;
    border-bottom: 1px solid var(--border);
    border-radius: 0;
  }

  .nav-links.open {
    display: flex;
  }

  .mobile-menu-btn {
    display: block;
  }

  .digest-title {
    font-size: 1.5rem;
  }

  .digest-top {
    flex-direction: column;
    align-items: flex-start;
  }

  main {
    padding: 16px 14px 32px;
  }

  .paper-card {
    padding: 14px 16px;
  }

  .modal {
    padding: 20px;
    border-radius: 12px;
    max-height: 85vh;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .categories-grid {
    grid-template-columns: 1fr;
  }

  .paper-title {
    font-size: 0.9375rem;
  }
}

@media (max-width: 480px) {
  .digest-title {
    font-size: 1.25rem;
  }

  .stat-value {
    font-size: 1.5rem;
  }

  .grid-2col {
    gap: 16px;
  }
}

/* Print */
@media print {
  .nav, .footer { display: none; }
  main { padding: 0; }
  .paper-card { break-inside: avoid; border: 1px solid #ddd; }
}

/* Focus visible */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button:focus:not(:focus-visible) {
  outline: none;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-hover);
}