/* ResearchScope custom styles */

:root {
  --rs-primary: #4f46e5;
  --rs-primary-dark: #3730a3;
  --rs-bg: #f8fafc;
  --rs-surface: #ffffff;
  --rs-text: #1e293b;
  --rs-muted: #64748b;
  --rs-border: #e2e8f0;
  --rs-accent: #06b6d4;
}

[data-theme="dark"] {
  --rs-bg: #0f172a;
  --rs-surface: #1e293b;
  --rs-text: #f1f5f9;
  --rs-muted: #94a3b8;
  --rs-border: #334155;
}

body {
  background-color: var(--rs-bg);
  color: var(--rs-text);
  transition: background-color 0.2s, color 0.2s;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

/* ── Nav ─────────────────────────────────────────── */
.rs-nav {
  background-color: var(--rs-surface);
  border-bottom: 1px solid var(--rs-border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.rs-nav a {
  color: var(--rs-muted);
  transition: color 0.15s;
}

.rs-nav a:hover,
.rs-nav a.active {
  color: var(--rs-primary);
}

/* ── Global search ───────────────────────────────── */
.search-wrap {
  position: relative;
}
.search-input {
  background: var(--rs-bg);
  border: 1px solid var(--rs-border);
  border-radius: 0.5rem;
  color: var(--rs-text);
  font-size: 0.8rem;
  padding: 0.3rem 0.75rem 0.3rem 2rem;
  width: 200px;
  transition: width 0.2s, border-color 0.15s;
  outline: none;
}
.search-input:focus {
  border-color: var(--rs-primary);
  width: 260px;
}
.search-input::placeholder { color: var(--rs-muted); }
.search-icon {
  position: absolute;
  left: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--rs-muted);
  pointer-events: none;
  width: 14px; height: 14px;
}
.search-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  width: 380px;
  max-height: 480px;
  overflow-y: auto;
  background: var(--rs-surface);
  border: 1px solid var(--rs-border);
  border-radius: 0.75rem;
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
  z-index: 200;
}
.search-dropdown.hidden { display: none; }
.search-section-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--rs-muted);
  padding: 0.6rem 0.75rem 0.3rem;
}
.search-result-item {
  display: block;
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  transition: background 0.1s;
  text-decoration: none;
  color: var(--rs-text);
  border-radius: 0;
}
.search-result-item:hover,
.search-result-item.focused {
  background: var(--rs-border);
}
.search-result-item .sr-title {
  font-size: 0.82rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.search-result-item .sr-meta {
  font-size: 0.72rem;
  color: var(--rs-muted);
  margin-top: 1px;
}
.search-see-all {
  display: block;
  text-align: center;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--rs-primary);
  padding: 0.6rem;
  border-top: 1px solid var(--rs-border);
  cursor: pointer;
  text-decoration: none;
}
.search-see-all:hover { text-decoration: underline; }
.search-empty {
  padding: 1.5rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--rs-muted);
}

/* ── Mobile nav menu ─────────────────────────────── */
.mobile-nav-link {
  display: block;
  padding: 0.5rem 0.75rem;
  border-radius: 0.5rem;
  color: var(--rs-muted);
  transition: color 0.15s, background-color 0.15s;
}
.mobile-nav-link:hover,
.mobile-nav-link.active {
  color: var(--rs-primary);
  background-color: var(--rs-border);
}
#mobile-menu-btn {
  color: var(--rs-muted);
  transition: color 0.15s;
}
#mobile-menu-btn:hover {
  color: var(--rs-primary);
}

/* ── Cards ───────────────────────────────────────── */
.rs-card {
  background-color: var(--rs-surface);
  border: 1px solid var(--rs-border);
  border-radius: 0.75rem;
  transition: box-shadow 0.2s, transform 0.15s;
}

.rs-card:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  transform: translateY(-1px);
}

/* ── Badges ──────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: 9999px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.badge-beginner   { background: #dcfce7; color: #166534; }
.badge-intermediate { background: #fef9c3; color: #854d0e; }
.badge-advanced   { background: #fee2e2; color: #991b1b; }
.badge-tag        { background: #ede9fe; color: #4c1d95; }
.badge-score      { background: #e0f2fe; color: #0c4a6e; }

[data-theme="dark"] .badge-beginner   { background: #14532d; color: #86efac; }
[data-theme="dark"] .badge-intermediate { background: #713f12; color: #fde68a; }
[data-theme="dark"] .badge-advanced   { background: #7f1d1d; color: #fca5a5; }
[data-theme="dark"] .badge-tag        { background: #2e1065; color: #c4b5fd; }
[data-theme="dark"] .badge-score      { background: #0c4a6e; color: #7dd3fc; }

/* ── Tables ──────────────────────────────────────── */
.rs-table {
  width: 100%;
  border-collapse: collapse;
}

.rs-table th {
  background-color: var(--rs-bg);
  color: var(--rs-muted);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--rs-border);
}

.rs-table td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--rs-border);
  vertical-align: top;
  color: var(--rs-text);
}

.rs-table tr:last-child td { border-bottom: none; }

.rs-table tbody tr:hover {
  background-color: var(--rs-bg);
  cursor: pointer;
}

/* ── Search / filters ────────────────────────────── */
.rs-input {
  background-color: var(--rs-surface);
  border: 1px solid var(--rs-border);
  border-radius: 0.5rem;
  color: var(--rs-text);
  padding: 0.5rem 0.875rem;
  width: 100%;
  transition: border-color 0.15s;
}

.rs-input:focus {
  outline: none;
  border-color: var(--rs-primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.rs-select {
  background-color: var(--rs-surface);
  border: 1px solid var(--rs-border);
  border-radius: 0.5rem;
  color: var(--rs-text);
  padding: 0.5rem 2rem 0.5rem 0.875rem;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2364748b'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.5rem center;
  background-size: 1rem;
  cursor: pointer;
}

/* ── Detail expand ───────────────────────────────── */
.detail-row { display: none; }
.detail-row.open { display: table-row; }
.detail-row td {
  background-color: var(--rs-bg);
  padding: 1rem 1.25rem 1.25rem;
}

/* ── Stats bar ───────────────────────────────────── */
.stat-card {
  background: var(--rs-surface);
  border: 1px solid var(--rs-border);
  border-radius: 0.75rem;
  padding: 1.25rem 1.5rem;
  text-align: center;
}

.stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--rs-primary);
  line-height: 1;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--rs-muted);
  margin-top: 0.25rem;
}

/* ── Hero ────────────────────────────────────────── */
.hero-gradient {
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #06b6d4 100%);
}

/* ── Theme toggle ────────────────────────────────── */
#theme-toggle {
  cursor: pointer;
  padding: 0.35rem;
  border-radius: 0.5rem;
  border: 1px solid var(--rs-border);
  background: var(--rs-surface);
  color: var(--rs-text);
  transition: background 0.15s;
}

#theme-toggle:hover { background: var(--rs-bg); }

/* ── Topic chips ─────────────────────────────────── */
.topic-chip {
  display: inline-block;
  padding: 0.35rem 0.9rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--rs-surface);
  border: 1px solid var(--rs-border);
  color: var(--rs-primary);
  transition: background 0.15s, transform 0.1s;
  cursor: pointer;
}

.topic-chip:hover {
  background: var(--rs-primary);
  color: #fff;
  transform: translateY(-1px);
}

/* ── Gap card ────────────────────────────────────── */
.gap-card {
  background: var(--rs-surface);
  border-left: 4px solid var(--rs-primary);
  border-radius: 0.5rem;
  padding: 1.25rem;
  margin-bottom: 1rem;
}

/* ── Responsive ──────────────────────────────────── */
@media (max-width: 640px) {
  .rs-table thead { display: none; }
  .rs-table td {
    display: block;
    border-bottom: none;
    padding: 0.35rem 0.75rem;
  }
  .rs-table tr { border-bottom: 1px solid var(--rs-border); }
}

/* ── Scrollbar ───────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--rs-border); border-radius: 3px; }

/* ── Loading spinner ─────────────────────────────── */
.spinner {
  width: 2rem; height: 2rem;
  border: 3px solid var(--rs-border);
  border-top-color: var(--rs-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin: 2rem auto;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Empty state ─────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--rs-muted);
}
.empty-state svg { margin: 0 auto 1rem; opacity: 0.4; }

/* ── Score bar ───────────────────────────────────── */
.score-bar-wrap { display: flex; align-items: center; gap: 0.5rem; }
.score-bar-bg {
  flex: 1; height: 6px; border-radius: 3px;
  background: var(--rs-border);
  overflow: hidden;
}
.score-bar-fill {
  height: 100%; border-radius: 3px;
  background: linear-gradient(90deg, #4f46e5, #7c3aed);
  transition: width 0.4s ease;
}
.score-bar-label { font-size: 0.72rem; color: var(--rs-muted); min-width: 2.5rem; text-align: right; }

/* ── Difficulty levels ───────────────────────────── */
.badge-l1 { background: #dcfce7; color: #166534; }
.badge-l2 { background: #fef9c3; color: #854d0e; }
.badge-l3 { background: #fee2e2; color: #991b1b; }
.badge-l4 { background: #fae8ff; color: #701a75; }
[data-theme="dark"] .badge-l1 { background: #14532d; color: #86efac; }
[data-theme="dark"] .badge-l2 { background: #713f12; color: #fde68a; }
[data-theme="dark"] .badge-l3 { background: #7f1d1d; color: #fca5a5; }
[data-theme="dark"] .badge-l4 { background: #4a044e; color: #e879f9; }

/* ── Paper type badge ────────────────────────────── */
.badge-type { background: #f0fdf4; color: #166534; }
[data-theme="dark"] .badge-type { background: #052e16; color: #86efac; }

/* ── Source badge ────────────────────────────────── */
.badge-arxiv   { background: #fff7ed; color: #9a3412; }
.badge-acl     { background: #eff6ff; color: #1d4ed8; }
.badge-conf    { background: #f0fdf4; color: #15803d; }
[data-theme="dark"] .badge-arxiv { background: #431407; color: #fdba74; }
[data-theme="dark"] .badge-acl   { background: #1e3a5f; color: #93c5fd; }

/* ── Gap cards ───────────────────────────────────── */
.gap-card-explicit  { border-left-color: #4f46e5; }
.gap-card-pattern   { border-left-color: #f59e0b; }
.gap-card-starter   { border-left-color: #10b981; }
[data-theme="dark"] .gap-card-explicit  { border-left-color: #818cf8; }
[data-theme="dark"] .gap-card-pattern   { border-left-color: #fbbf24; }
[data-theme="dark"] .gap-card-starter   { border-left-color: #34d399; }

/* ── Editorial card ──────────────────────────────── */
.editorial-card {
  background: linear-gradient(135deg, #f0f4ff 0%, #faf5ff 100%);
  border: 1px solid #c7d2fe;
  border-radius: 0.75rem;
  padding: 1.25rem;
}
[data-theme="dark"] .editorial-card {
  background: linear-gradient(135deg, #1e1b4b 0%, #1a0a2e 100%);
  border-color: #3730a3;
}

/* ── Momentum bar ────────────────────────────────── */
.momentum-bar { height: 4px; border-radius: 2px; background: var(--rs-border); }
.momentum-fill { height: 100%; border-radius: 2px; background: linear-gradient(90deg, #06b6d4, #4f46e5); }

/* ── Reading path ────────────────────────────────── */
.reading-path-step {
  display: flex; align-items: flex-start; gap: 0.75rem; margin-bottom: 0.75rem;
}
.path-number {
  width: 1.75rem; height: 1.75rem;
  background: var(--rs-primary); color: #fff;
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem; font-weight: 700; flex-shrink: 0;
}

/* ── Conference rank badge ───────────────────────── */
.rank-astar { background: #fef3c7; color: #92400e; border: 1px solid #fbbf24; }
.rank-a     { background: #eff6ff; color: #1d4ed8; border: 1px solid #93c5fd; }
.rank-b     { background: #f0fdf4; color: #166534; border: 1px solid #86efac; }
[data-theme="dark"] .rank-astar { background: #451a03; color: #fde68a; }
[data-theme="dark"] .rank-a     { background: #1e3a5f; color: #93c5fd; }

/* ── Paper of the Day ────────────────────────────── */
.potd-wrap {
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 60%, #06b6d4 100%);
  border-radius: 1rem; padding: 2rem; color: #fff;
  position: relative; overflow: hidden;
}
.potd-wrap::before {
  content: ''; position: absolute; top: -50px; right: -50px;
  width: 220px; height: 220px; border-radius: 50%;
  background: rgba(255,255,255,0.07);
}
.potd-wrap::after {
  content: ''; position: absolute; bottom: -30px; left: 30%;
  width: 140px; height: 140px; border-radius: 50%;
  background: rgba(255,255,255,0.04);
}
.potd-label {
  font-size: 0.68rem; font-weight: 800;
  text-transform: uppercase; letter-spacing: 0.12em;
  opacity: 0.85; margin-bottom: 0.75rem;
  display: flex; align-items: center; gap: 0.5rem;
}
.potd-title {
  font-size: 1.3rem; font-weight: 800; line-height: 1.3;
  margin-bottom: 0.5rem;
}
.potd-title a { color: #fff; text-decoration: none; }
.potd-title a:hover { text-decoration: underline; }
.potd-meta { font-size: 0.82rem; opacity: 0.8; margin-bottom: 0.75rem; }
.potd-abstract {
  font-size: 0.875rem; opacity: 0.88; line-height: 1.6;
  margin-bottom: 1.25rem;
  display: -webkit-box; -webkit-line-clamp: 3;
  -webkit-box-orient: vertical; overflow: hidden;
}
.potd-actions { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; }
.potd-btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.45rem 1rem; border-radius: 0.5rem;
  font-size: 0.8rem; font-weight: 600;
  cursor: pointer; transition: all 0.15s;
  text-decoration: none; border: none; line-height: 1;
}
.potd-btn-primary { background: #fff; color: #4f46e5; }
.potd-btn-primary:hover { background: #e0e7ff; }
.potd-btn-ghost {
  background: rgba(255,255,255,0.15); color: #fff;
  border: 1px solid rgba(255,255,255,0.35);
}
.potd-btn-ghost:hover { background: rgba(255,255,255,0.25); }
.potd-next { font-size: 0.72rem; opacity: 0.65; margin-left: auto; }

/* ── GitHub Star button ──────────────────────────── */
.github-star-btn {
  display: inline-flex; align-items: center; gap: 0.35rem;
  padding: 0.28rem 0.65rem; border-radius: 0.375rem;
  background: #24292f; color: #fff;
  font-size: 0.75rem; font-weight: 600;
  text-decoration: none; transition: background 0.15s;
  border: 1px solid #30363d; white-space: nowrap; line-height: 1;
}
.github-star-btn:hover { background: #383f47; color: #fff; }
.github-star-count {
  background: rgba(255,255,255,0.15);
  padding: 0 5px; border-radius: 3px;
  font-size: 0.7rem; font-weight: 700;
}
[data-theme="dark"] .github-star-btn { background: #30363d; border-color: #484f58; }
[data-theme="dark"] .github-star-btn:hover { background: #3d444d; }

/* ── Star CTA strip ──────────────────────────────── */
.star-cta {
  background: linear-gradient(90deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  color: #fff; text-align: center; padding: 0.85rem 1rem;
  display: flex; align-items: center; justify-content: center; gap: 1rem;
  flex-wrap: wrap;
}
.star-cta-text { font-size: 0.875rem; opacity: 0.9; }
.star-cta-btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.4rem 1rem; border-radius: 0.5rem;
  background: #f0c040; color: #1a1a2e;
  font-size: 0.8rem; font-weight: 700;
  text-decoration: none; transition: background 0.15s; white-space: nowrap;
}
.star-cta-btn:hover { background: #f5d060; }

/* ── Tweet / share button ────────────────────────── */
.tweet-btn {
  display: inline-flex; align-items: center; gap: 0.3rem;
  padding: 0.3rem 0.65rem; border-radius: 0.375rem;
  background: #000; color: #fff;
  font-size: 0.72rem; font-weight: 600;
  cursor: pointer; transition: background 0.15s;
  text-decoration: none; border: none;
}
.tweet-btn:hover { background: #333; }
.copy-link-btn {
  display: inline-flex; align-items: center; gap: 0.3rem;
  padding: 0.3rem 0.65rem; border-radius: 0.375rem;
  background: var(--rs-bg); color: var(--rs-text);
  font-size: 0.72rem; font-weight: 600;
  cursor: pointer; transition: background 0.15s;
  border: 1px solid var(--rs-border);
}
.copy-link-btn:hover { background: var(--rs-border); }

/* ── Weekly Digest ───────────────────────────────── */
.digest-header {
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
  color: #fff; border-radius: 1rem; padding: 2rem 2.5rem;
  margin-bottom: 2rem;
}
.digest-section-title {
  display: flex; align-items: center; gap: 0.75rem;
  font-size: 1rem; font-weight: 700; margin: 2rem 0 0.75rem;
  padding-bottom: 0.5rem; border-bottom: 2px solid var(--rs-border);
}
.digest-paper-card {
  background: var(--rs-surface); border: 1px solid var(--rs-border);
  border-radius: 0.75rem; padding: 1.25rem;
  display: flex; flex-direction: column; gap: 0.5rem;
  transition: box-shadow 0.15s;
}
.digest-paper-card:hover { box-shadow: 0 4px 16px rgba(0,0,0,0.08); }

/* ── Paginator ───────────────────────────────────── */
.pager-btn {
  padding: 0.4rem 0.9rem; border-radius: 0.375rem;
  border: 1px solid var(--rs-border);
  background: var(--rs-surface); color: var(--rs-text);
  cursor: pointer; font-size: 0.85rem; transition: background 0.15s;
}
.pager-btn:hover, .pager-btn.active { background: var(--rs-primary); color: #fff; border-color: var(--rs-primary); }
.pager-btn:disabled { opacity: 0.4; cursor: not-allowed; }