@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ── Design Tokens ─────────────────────────────────────────────────────────── */
:root {
  --bg: #060608;
  --bg-2: #0e0e11;
  --bg-3: #16161a;
  --bg-4: #1c1c21;
  --border: rgba(255,255,255,0.07);
  --border-hover: rgba(255,255,255,0.14);
  --accent: #5b7fff;
  --accent-2: #7c3aed;
  --accent-glow: rgba(91,127,255,0.25);
  --text-1: #f0f0f5;
  --text-2: #8e8ea0;
  --text-3: #5a5a70;
  --glass: rgba(14,14,17,0.85);
  --success: #22c55e;
  --warn: #f59e0b;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --r-sm: 12px;
  --r-md: 18px;
  --r-lg: 24px;
  --r-xl: 32px;
  --shadow-lg: 0 32px 64px rgba(0,0,0,0.6);
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="light"] {
  --bg: #f5f5f7;
  --bg-2: #ffffff;
  --bg-3: #ebebef;
  --bg-4: #e0e0e8;
  --border: rgba(0,0,0,0.08);
  --border-hover: rgba(0,0,0,0.16);
  --glass: rgba(245,245,247,0.9);
  --text-1: #1a1a2e;
  --text-2: #4a4a6a;
  --text-3: #8a8aaa;
  --shadow-lg: 0 32px 64px rgba(0,0,0,0.12);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text-1);
  font-family: var(--font);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }

/* ── Landing Page ──────────────────────────────────────────────────────────── */
.landing-body { overflow: hidden; height: 100vh; display: flex; flex-direction: column; }

.top-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 2.5rem;
  position: relative;
  z-index: 10;
}

.nav-brand {
  font-size: 1.1rem;
  font-weight: 700;
  background: linear-gradient(135deg, #fff 0%, #888 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.03em;
}

[data-theme="light"] .nav-brand {
  background: linear-gradient(135deg, #1a1a2e 0%, #4a4a6a 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-link {
  font-size: 0.85rem;
  color: var(--text-2);
  transition: color 0.2s;
}
.nav-link:hover { color: var(--text-1); }

.landing-hero {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
  position: relative;
  gap: 2rem;
}

.hero-glow {
  position: absolute;
  width: 600px;
  height: 300px;
  background: radial-gradient(ellipse, rgba(91,127,255,0.12) 0%, transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -60%);
  pointer-events: none;
}

.brand-lockup { display: flex; flex-direction: column; align-items: center; gap: 0.5rem; }

.brand-title {
  font-size: clamp(4rem, 10vw, 7rem);
  font-weight: 700;
  letter-spacing: -0.05em;
  background: linear-gradient(135deg, #ffffff 0%, #9090b0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
}

[data-theme="light"] .brand-title {
  background: linear-gradient(135deg, #1a1a2e 0%, #4a4a6a 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.tagline {
  font-size: 0.9rem;
  color: var(--text-2);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  font-weight: 400;
}

/* ── Search Box ────────────────────────────────────────────────────────────── */
.search-box-large {
  width: 100%;
  max-width: 700px;
  position: relative;
}

.search-wrapper {
  display: flex;
  align-items: center;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 0.4rem 0.4rem 0.4rem 1.5rem;
  transition: var(--transition);
  box-shadow: var(--shadow-lg);
  gap: 0.75rem;
}

.search-wrapper:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-glow), var(--shadow-lg);
}

.search-icon-main {
  width: 18px;
  height: 18px;
  color: var(--text-3);
  flex-shrink: 0;
}

.search-input-main {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--text-1);
  font-size: 1.1rem;
  font-family: var(--font);
  outline: none;
  padding: 0.75rem 0;
}

.search-input-main::placeholder { color: var(--text-3); }

.search-submit-btn {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 100px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: var(--transition);
}

.search-submit-btn:hover { background: #4a6aee; transform: scale(1.05); }

/* ── Autocomplete ──────────────────────────────────────────────────────────── */
.autocomplete-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0; right: 0;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  overflow: hidden;
  z-index: 200;
  box-shadow: var(--shadow-lg);
}

.autocomplete-dropdown.hidden { display: none; }

.autocomplete-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1.5rem;
  cursor: pointer;
  font-size: 0.95rem;
  color: var(--text-1);
  transition: background 0.15s;
}

.autocomplete-item:hover, .autocomplete-item.focused { background: var(--bg-3); }

.autocomplete-item svg { color: var(--text-3); flex-shrink: 0; }

/* ── Recent Searches ──────────────────────────────────────────────────────── */
.recent-searches {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.recent-label, .trending-label {
  font-size: 0.75rem;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
}

.recent-list { display: flex; gap: 0.5rem; flex-wrap: wrap; justify-content: center; }

.recent-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  color: var(--text-2);
  background: var(--bg-3);
  padding: 0.35rem 0.85rem;
  border-radius: 100px;
  border: 1px solid var(--border);
  transition: var(--transition);
}

.recent-item:hover { color: var(--text-1); border-color: var(--border-hover); }

/* ── Trending Tags ─────────────────────────────────────────────────────────── */
.trending-section { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; justify-content: center; }

.tag-cloud { display: flex; flex-wrap: wrap; gap: 0.6rem; justify-content: center; }

.i-tag {
  background: var(--bg-3);
  padding: 0.45rem 1rem;
  border-radius: 100px;
  font-size: 0.85rem;
  color: var(--text-2);
  border: 1px solid var(--border);
  transition: var(--transition);
  cursor: pointer;
}

.i-tag:hover {
  background: var(--bg-4);
  color: var(--text-1);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

/* ── Landing Footer ─────────────────────────────────────────────────────────── */
.landing-footer {
  padding: 1rem 2rem;
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-3);
}

/* ── Results Header ─────────────────────────────────────────────────────────── */
.results-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  max-width: 1560px;
  margin: 0 auto;
  padding: 0.9rem 2rem;
}

.brand-mini {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, #fff 0%, #888 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.04em;
  flex-shrink: 0;
}

[data-theme="light"] .brand-mini {
  background: linear-gradient(135deg, #1a1a2e 0%, #4a4a6a 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.search-wrapper.compact {
  padding: 0.25rem 0.25rem 0.25rem 1rem;
  box-shadow: none;
}

.search-wrapper.compact .search-submit-btn { width: 36px; height: 36px; }

.search-icon-compact {
  width: 16px;
  height: 16px;
  color: var(--text-3);
  flex-shrink: 0;
}

.search-input-compact {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--text-1);
  font-size: 0.95rem;
  font-family: var(--font);
  outline: none;
  padding: 0.5rem 0;
  width: 100%;
}

.search-input-compact::placeholder { color: var(--text-3); }

.header-actions { display: flex; gap: 0.5rem; margin-left: auto; }

.icon-btn {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-2);
  transition: var(--transition);
}

.icon-btn:hover { background: var(--bg-4); color: var(--text-1); }

.header-tabs {
  border-top: 1px solid var(--border);
  padding: 0 2rem;
}

.max-wrap {
  max-width: 1560px;
  margin: 0 auto;
  display: flex;
  gap: 0.25rem;
}

.tab-btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-2);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font);
  margin-bottom: -1px;
}

.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }
.tab-btn:hover:not(.active) { color: var(--text-1); }

/* ── Layout ─────────────────────────────────────────────────────────────────── */
.main-content {
  max-width: 1560px;
  margin: 0 auto;
  padding: 2rem;
}

.error-banner {
  background: rgba(239,68,68,0.1);
  border: 1px solid rgba(239,68,68,0.3);
  color: #f87171;
  border-radius: var(--r-md);
  padding: 0.85rem 1.25rem;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
}

.results-grid {
  display: grid;
  grid-template-columns: 1fr 460px;
  gap: 3rem;
  align-items: start;
}

/* ── Results Meta ────────────────────────────────────────────────────────────── */
.results-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.results-count { font-size: 0.8rem; color: var(--text-3); }

.query-type-badge {
  font-size: 0.72rem;
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--text-2);
  padding: 0.2rem 0.6rem;
  border-radius: 100px;
  text-transform: capitalize;
}

/* ── Web Results ─────────────────────────────────────────────────────────────── */
.web-results {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.result-card {
  padding: 1.25rem 1.5rem;
  border-radius: var(--r-lg);
  border: 1px solid transparent;
  transition: var(--transition);
  cursor: pointer;
  position: relative;
}

.result-card:hover {
  background: var(--bg-2);
  border-color: var(--border);
  transform: translateX(2px);
}

.result-card.active {
  background: var(--bg-2);
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent), 0 8px 24px var(--accent-glow);
}

.result-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.result-domain {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  color: var(--text-3);
}

/* ── Favicon styles — real image + letter fallback ── */
.domain-favicon-img {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  flex-shrink: 0;
  object-fit: contain;
  display: block;
  /* Subtle box to frame transparent favicons */
  background: var(--bg-3);
  padding: 1px;
}

.domain-favicon {
  width: 18px;
  height: 18px;
  border-radius: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6rem;
  font-weight: 700;
  color: white;
  flex-shrink: 0;
}

/* ── URL breadcrumb ── */
.result-url-crumb {
  font-size: 0.72rem;
  color: var(--text-3);
  margin-bottom: 0.35rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
  font-family: 'SF Mono', 'Fira Code', monospace;
  letter-spacing: -0.01em;
}

.result-type-tag {
  font-size: 0.68rem;
  padding: 0.15rem 0.55rem;
  border-radius: 100px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 500;
}

.result-type-tag.article  { background: rgba(91,127,255,0.12); color: #7b9fff; }
.result-type-tag.research { background: rgba(124,58,237,0.12); color: #a78bfa; }
.result-type-tag.news     { background: rgba(245,158,11,0.12); color: #fbbf24; }
.result-type-tag.tool     { background: rgba(34,197,94,0.12);  color: #4ade80; }
.result-type-tag.video    { background: rgba(239,68,68,0.12);  color: #f87171; }
.result-type-tag.official { background: rgba(14,165,233,0.12); color: #38bdf8; }

.result-title {
  font-size: 1.15rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 0.4rem;
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.result-card:hover .result-title { color: #7b9fff; }

.result-snippet {
  color: var(--text-2);
  font-size: 0.9rem;
  line-height: 1.65;
}

.result-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.85rem;
  opacity: 0;
  transition: opacity 0.2s;
}

.result-card:hover .result-actions { opacity: 1; }

/* Always visible on touch/mobile */
@media (hover: none) {
  .result-actions { opacity: 1; }
}

.result-action-btn {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.76rem;
  color: var(--text-2);
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 0.3rem 0.75rem;
  cursor: pointer;
  font-family: var(--font);
  transition: var(--transition);
}

.result-action-btn:hover { background: var(--bg-4); color: var(--text-1); }

/* ── Related Searches ────────────────────────────────────────────────────────── */
.related-searches {
  margin-top: 2.5rem;
  padding: 1.5rem;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
}

.related-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
  font-weight: 500;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
}

.related-item {
  padding: 0.65rem 1rem;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  font-size: 0.85rem;
  color: var(--text-2);
  transition: var(--transition);
  display: block;
}

.related-item:hover { background: var(--bg-4); color: var(--text-1); border-color: var(--border-hover); }

/* ── Gen Panel ───────────────────────────────────────────────────────────────── */
.gen-panel {
  position: sticky;
  top: 110px;
  height: fit-content;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: 1.75rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  max-height: calc(100vh - 140px);
  overflow-y: auto;
}

.gen-panel::-webkit-scrollbar { width: 4px; }
.gen-panel::-webkit-scrollbar-track { background: transparent; }
.gen-panel::-webkit-scrollbar-thumb { background: var(--bg-4); border-radius: 2px; }

.gen-panel-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.gen-panel-mode {
  margin-left: auto;
  font-size: 0.7rem;
  color: var(--text-3);
  background: var(--bg-3);
  padding: 0.15rem 0.6rem;
  border-radius: 100px;
  text-transform: capitalize;
  letter-spacing: 0;
}

.ai-pulse {
  width: 10px;
  height: 10px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--accent-glow);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 8px var(--accent-glow); opacity: 1; }
  50% { box-shadow: 0 0 20px var(--accent-glow); opacity: 0.7; }
}

/* ── AI Components ───────────────────────────────────────────────────────────── */
#ai-output { font-size: 0.9rem; line-height: 1.65; transition: opacity 0.3s ease; }

.ai-card {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 1.25rem;
  margin-bottom: 1rem;
  position: relative;
}

.ai-card.highlight {
  background: linear-gradient(135deg, rgba(91,127,255,0.08) 0%, var(--bg-3) 100%);
  border-color: rgba(91,127,255,0.25);
}

.ai-card.highlight::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 3px; height: 100%;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
  border-radius: 3px 0 0 3px;
}

.ai-card.note {
  background: rgba(245,158,11,0.06);
  border-color: rgba(245,158,11,0.2);
}

.ai-card-label {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 0.6rem;
}

.ai-card.highlight .ai-card-label { color: var(--accent); }
.ai-card.note .ai-card-label { color: var(--warn); }

.ai-card h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-1);
  letter-spacing: -0.01em;
}

.ai-card p { color: var(--text-2); font-size: 0.875rem; }

.ai-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.ai-list li {
  display: flex;
  gap: 0.5rem;
  color: var(--text-2);
  font-size: 0.875rem;
  align-items: flex-start;
}

.ai-list li::before {
  content: '▸';
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 0.05em;
  font-size: 0.7rem;
}

/* Stats grid */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin: 0 0 1rem;
}

.stat-item {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -0.03em;
  line-height: 1;
}

.stat-label {
  font-size: 0.7rem;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Timeline */
.ai-timeline {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  padding-left: 0.5rem;
  border-left: 2px solid var(--border);
  margin: 0 0 1rem 0.75rem;
}

.ai-tl-item { display: flex; gap: 1rem; align-items: flex-start; position: relative; }

.ai-tl-item::before {
  content: '';
  position: absolute;
  left: -0.85rem;
  top: 0.4rem;
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-glow);
}

.ai-tl-mark {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  min-width: 50px;
  flex-shrink: 0;
  padding-top: 0.1em;
}

.ai-tl-item p { font-size: 0.85rem; color: var(--text-2); }

/* Concept Tags */
.concept-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.c-tag {
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--text-2);
  padding: 0.3rem 0.75rem;
  border-radius: 100px;
  font-size: 0.78rem;
  transition: var(--transition);
  cursor: default;
}

.c-tag:hover { background: var(--bg-4); color: var(--text-1); }

/* AI error */
.ai-error { color: var(--text-3); font-size: 0.85rem; font-style: italic; }

/* ── Follow-up Bar ────────────────────────────────────────────────────────────── */
.followup-bar {
  border-top: 1px solid var(--border);
  padding-top: 1rem;
  margin-top: 0.25rem;
}

.followup-input-wrap {
  display: flex;
  align-items: center;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 0.3rem 0.3rem 0.3rem 1rem;
  gap: 0.5rem;
  transition: var(--transition);
}

.followup-input-wrap:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.followup-input {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--text-1);
  font-size: 0.85rem;
  font-family: var(--font);
  outline: none;
}

.followup-input::placeholder { color: var(--text-3); }

.followup-btn {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 100px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  flex-shrink: 0;
}

.followup-btn:hover { background: #4a6aee; }

/* ── Loading Shimmer ─────────────────────────────────────────────────────────── */
.loading-shimmer {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.shimmer-line {
  height: 14px;
  background: linear-gradient(90deg, var(--bg-3) 25%, var(--bg-4) 50%, var(--bg-3) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.8s infinite linear;
  border-radius: 6px;
}

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

/* ── No-results empty state ──────────────────────────────────────────────────── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 4rem 2rem;
  color: var(--text-3);
  text-align: center;
}

.empty-state svg { opacity: 0.3; }
.empty-state p { font-size: 0.9rem; max-width: 320px; line-height: 1.6; }

/* ── Scroll-to-top button ────────────────────────────────────────────────────── */
.scroll-top-btn {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 40px;
  height: 40px;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-2);
  transition: var(--transition);
  opacity: 0;
  pointer-events: none;
  z-index: 50;
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}

.scroll-top-btn.visible { opacity: 1; pointer-events: auto; }
.scroll-top-btn:hover { background: var(--accent); color: white; border-color: var(--accent); transform: translateY(-2px); }

/* ── Keyboard shortcut hint ──────────────────────────────────────────────────── */
.kbd-hint {
  font-size: 0.72rem;
  color: var(--text-3);
  display: flex;
  align-items: center;
  gap: 0.3rem;
  flex-shrink: 0;
}

.kbd {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1rem 0.4rem;
  font-family: monospace;
  font-size: 0.7rem;
  color: var(--text-3);
}

/* ── Responsive ──────────────────────────────────────────────────────────────── */
@media (max-width: 1100px) {
  .results-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .gen-panel {
    position: static;
    max-height: none;
    order: -1;
  }
  #tab-ai { display: none; }
  #tab-ai.mobile-show { display: flex; }
  .tab-btn[data-tab="ai"].active ~ * #tab-ai { display: flex; }
}

@media (max-width: 680px) {
  .header-inner { gap: 0.75rem; }
  .brand-mini { display: none; }
  .main-content { padding: 1.25rem; }
  .related-grid { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: 1fr 1fr; }
  .kbd-hint { display: none; }
  .scroll-top-btn { bottom: 1.25rem; right: 1.25rem; }
}