:root {
  --sf-red: #b91c1c;
  --sf-red-dark: #7f1d1d;
  --sf-gold: #f4b400;
  --sf-ink: #0f172a;
  --sf-muted: #64748b;
  --sf-line: #e2e8f0;
  --sf-soft: #f8fafc;
}

/* Daily knowledge */
.sf-daily {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: minmax(210px, .72fr) minmax(0, 1.8fr);
  min-height: 248px;
  margin: 26px 0;
  border: 1px solid rgba(185, 28, 28, .14);
  border-radius: 22px;
  background: #fff;
  box-shadow: 0 18px 48px rgba(15, 23, 42, .08);
}
.sf-daily::after {
  content: "";
  position: absolute;
  width: 260px;
  height: 260px;
  right: -130px;
  bottom: -150px;
  border-radius: 50%;
  background: rgba(244, 180, 0, .1);
  pointer-events: none;
}
.sf-daily-intro {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 28px;
  color: #fff;
  background: linear-gradient(145deg, #7f1d1d 0%, #b91c1c 62%, #dc2626 100%);
}
.sf-daily-intro::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .16;
  background: radial-gradient(circle at 80% 14%, #fff 0 3px, transparent 4px), radial-gradient(circle at 70% 27%, #fff 0 2px, transparent 3px);
  background-size: 38px 38px;
}
.sf-kicker,
.sf-section-kicker {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  width: max-content;
  max-width: 100%;
  font-size: .72rem;
  font-weight: 850;
  letter-spacing: .08em;
  text-transform: uppercase;
  white-space: nowrap;
}
.sf-daily-intro h2 {
  position: relative;
  margin: 12px 0 8px;
  color: #fff;
  font-size: clamp(1.3rem, 2vw, 1.85rem);
  line-height: 1.18;
}
.sf-daily-intro p { position: relative; margin: 0; color: rgba(255,255,255,.82); font-size: .86rem; }
.sf-daily-progress {
  position: relative;
  display: flex;
  align-items: center;
  gap: 9px;
  margin-top: 20px;
  font-size: .78rem;
  font-weight: 750;
  white-space: nowrap;
}
.sf-daily-progress strong { font-size: 1.35rem; color: #fde68a; }
.sf-daily-main { min-width: 0; padding: 24px 28px; }
.sf-daily-tabs,
.sf-periods,
.sf-search-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.sf-daily-tabs::-webkit-scrollbar,
.sf-periods::-webkit-scrollbar,
.sf-search-tabs::-webkit-scrollbar { display: none; }
.sf-daily-tab,
.sf-period,
.sf-search-tab {
  flex: 0 0 auto;
  border: 1px solid var(--sf-line);
  border-radius: 999px;
  background: #fff;
  color: #475569;
  font: inherit;
  font-size: .76rem;
  font-weight: 800;
  padding: 8px 12px;
  cursor: pointer;
  white-space: nowrap;
}
.sf-daily-tab.active,
.sf-period.active,
.sf-search-tab.active { border-color: var(--sf-red); background: var(--sf-red); color: #fff; }
.sf-daily-content { display: grid; grid-template-columns: 52px minmax(0, 1fr) auto; gap: 16px; align-items: center; min-height: 116px; padding-top: 18px; }
.sf-daily-icon { display: grid; place-items: center; width: 52px; height: 52px; border-radius: 16px; color: var(--sf-red); background: #fef2f2; font-size: 1.2rem; }
.sf-daily-copy { min-width: 0; }
.sf-daily-copy small { display: block; margin-bottom: 5px; color: var(--sf-red); font-size: .7rem; font-weight: 850; letter-spacing: .06em; text-transform: uppercase; white-space: nowrap; }
.sf-daily-copy h3 { margin: 0 0 7px; color: var(--sf-ink); font-size: clamp(1rem, 1.6vw, 1.3rem); line-height: 1.25; }
.sf-daily-copy p { margin: 0; color: #475569; font-size: .86rem; line-height: 1.55; }
.sf-learned-btn {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border: 1px solid #fecaca;
  border-radius: 11px;
  padding: 10px 13px;
  color: var(--sf-red);
  background: #fff7f7;
  font: inherit;
  font-size: .77rem;
  font-weight: 850;
  cursor: pointer;
  white-space: nowrap;
}
.sf-learned-btn.done { border-color: #bbf7d0; color: #166534; background: #f0fdf4; }

/* Historical timeline */
.sf-timeline { margin: 34px 0; padding: 30px; border: 1px solid var(--sf-line); border-radius: 22px; background: linear-gradient(180deg, #fff, #f8fafc); box-shadow: 0 16px 45px rgba(15,23,42,.07); }
.sf-section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; margin-bottom: 20px; }
.sf-section-kicker { color: var(--sf-red); }
.sf-section-head h2 { margin: 6px 0 0; color: var(--sf-ink); font-size: clamp(1.25rem, 2vw, 1.75rem); }
.sf-timeline-actions { display: flex; gap: 8px; }
.sf-icon-btn { width: 38px; height: 38px; border: 1px solid var(--sf-line); border-radius: 11px; color: var(--sf-ink); background: #fff; cursor: pointer; }
.sf-periods { padding: 2px 0 16px; }
.sf-timeline-track {
  position: relative;
  display: flex;
  gap: 16px;
  overflow-x: auto;
  padding: 20px 2px 16px;
  scroll-snap-type: x mandatory;
  scrollbar-color: #cbd5e1 transparent;
}
.sf-timeline-track::before { content: ""; position: absolute; left: 0; right: 0; top: 8px; height: 2px; background: linear-gradient(90deg, var(--sf-red), #f59e0b); }
.sf-event {
  position: relative;
  flex: 0 0 292px;
  overflow: hidden;
  border: 1px solid var(--sf-line);
  border-radius: 17px;
  background: #fff;
  scroll-snap-align: start;
  box-shadow: 0 8px 22px rgba(15,23,42,.06);
}
.sf-event::before { content: ""; position: absolute; top: -18px; left: 28px; z-index: 2; width: 11px; height: 11px; border: 4px solid #fff; border-radius: 50%; background: var(--sf-red); box-shadow: 0 0 0 2px var(--sf-red); }
.sf-event-image { position: relative; height: 118px; overflow: hidden; background: linear-gradient(135deg, #7f1d1d, #dc2626); }
.sf-event-image img { width: 100%; height: 100%; object-fit: cover; opacity: .86; }
.sf-event-image img[src*="clb_logo_circular"] { object-fit: contain; padding: 14px; background: linear-gradient(135deg, #fff1f2, #fee2e2); }
.sf-event-year { position: absolute; left: 13px; bottom: 11px; padding: 5px 9px; border-radius: 8px; color: #fff; background: rgba(127,29,29,.92); font-size: .78rem; font-weight: 900; }
.sf-event-body { padding: 15px; }
.sf-event-type { color: var(--sf-red); font-size: .66rem; font-weight: 850; letter-spacing: .05em; text-transform: uppercase; white-space: nowrap; }
.sf-event h3 { margin: 7px 0; min-height: 42px; color: var(--sf-ink); font-size: .98rem; line-height: 1.35; }
.sf-event p { display: -webkit-box; overflow: hidden; min-height: 58px; margin: 0; color: var(--sf-muted); font-size: .79rem; line-height: 1.5; -webkit-line-clamp: 3; -webkit-box-orient: vertical; }
.sf-event-buttons { display: grid; grid-template-columns: 1fr; gap: 7px; margin-top: 14px; }
.sf-event-buttons button { overflow: hidden; border: 1px solid var(--sf-line); border-radius: 9px; padding: 8px 5px; color: #334155; background: #fff; font: inherit; font-size: .7rem; font-weight: 800; text-overflow: ellipsis; white-space: nowrap; cursor: pointer; }
.sf-event-buttons button:hover { border-color: #fca5a5; color: var(--sf-red); }
.sf-event-buttons button.selected { border-color: var(--sf-red); color: #fff; background: var(--sf-red); }
.sf-compare { display: none; align-items: center; justify-content: space-between; gap: 14px; margin-top: 14px; padding: 13px 15px; border: 1px solid #fde68a; border-radius: 13px; background: #fffbeb; }
.sf-compare.show { display: flex; }
.sf-compare span { min-width: 0; overflow: hidden; color: #78350f; font-size: .79rem; font-weight: 750; text-overflow: ellipsis; white-space: nowrap; }
.sf-compare button { flex: 0 0 auto; border: 0; border-radius: 9px; padding: 9px 12px; color: #fff; background: #92400e; font: inherit; font-size: .74rem; font-weight: 850; cursor: pointer; }
#sfComparisonModal { position: fixed; inset: 0; z-index: 10040; display: grid; place-items: center; padding: 18px; }
.sf-compare-modal-backdrop { position: absolute; inset: 0; background: rgba(2,6,23,.72); backdrop-filter: blur(6px); }
.sf-compare-modal { position: relative; width: min(760px, 100%); max-height: calc(100dvh - 36px); overflow-y: auto; padding: 25px; border-radius: 20px; background: #fff; box-shadow: 0 28px 80px rgba(0,0,0,.3); }
.sf-compare-modal > .sf-search-close { position: absolute; top: 14px; right: 14px; color: var(--sf-ink); border-color: var(--sf-line); }
.sf-compare-modal h2 { margin: 7px 0 18px; color: var(--sf-ink); }
.sf-compare-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 12px; }
.sf-compare-grid article { padding: 18px; border: 1px solid var(--sf-line); border-radius: 14px; background: var(--sf-soft); }
.sf-compare-grid strong { color: var(--sf-red); font-size: 1.5rem; }
.sf-compare-grid h3 { margin: 7px 0; color: var(--sf-ink); font-size: 1rem; }
.sf-compare-grid p { color: #475569; font-size: .82rem; line-height: 1.55; }
.sf-compare-grid small { color: var(--sf-red); font-weight: 800; }

/* Semantic search */
.search-hub-modal.sf-upgraded { z-index: 10020; padding: 18px; align-items: center; justify-content: center; }
.sf-upgraded .search-hub-backdrop { position: fixed; inset: 0; background: rgba(2,6,23,.72); backdrop-filter: blur(7px); }
.sf-search-shell { position: relative; z-index: 1; display: flex; flex-direction: column; width: min(1120px, 100%); height: min(820px, calc(100dvh - 36px)); overflow: hidden; border: 1px solid rgba(255,255,255,.5); border-radius: 22px; background: #f8fafc; box-shadow: 0 30px 90px rgba(0,0,0,.3); }
.sf-search-head { padding: 20px 22px 14px; color: #fff; background: linear-gradient(120deg, #7f1d1d, #b91c1c 68%, #991b1b); }
.sf-search-brand { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 13px; }
.sf-search-brand span { display: flex; align-items: center; gap: 9px; font-size: .82rem; font-weight: 850; white-space: nowrap; }
.sf-search-close { width: 34px; height: 34px; border: 1px solid rgba(255,255,255,.28); border-radius: 10px; color: #fff; background: rgba(255,255,255,.1); cursor: pointer; }
.sf-search-input-wrap { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: 10px; padding: 0 13px; border-radius: 13px; background: #fff; box-shadow: 0 8px 25px rgba(69,10,10,.22); }
.sf-search-input-wrap > i { color: var(--sf-red); }
#searchHubInput.sf-input { width: 100%; height: 52px; min-width: 0; border: 0; outline: 0; color: var(--sf-ink); background: transparent; font: inherit; font-size: .95rem; font-weight: 650; }
.sf-search-go { border: 0; border-radius: 9px; padding: 9px 13px; color: #fff; background: var(--sf-red); font: inherit; font-size: .76rem; font-weight: 850; cursor: pointer; white-space: nowrap; }
.sf-search-tabs { padding: 12px 22px; border-bottom: 1px solid var(--sf-line); background: #fff; }
.sf-search-body { flex: 1; min-height: 0; overflow-y: auto; padding: 18px 22px 24px; }
.sf-search-answer { margin-bottom: 18px; padding: 17px 19px; border: 1px solid #fecaca; border-left: 4px solid var(--sf-red); border-radius: 14px; background: linear-gradient(120deg, #fff, #fff7f7); }
.sf-search-answer-head { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; color: var(--sf-red); font-size: .75rem; font-weight: 900; text-transform: uppercase; white-space: nowrap; }
.sf-search-answer p { margin: 0; color: #334155; font-size: .88rem; line-height: 1.62; }
.sf-result-section { margin-bottom: 20px; }
.sf-result-title { display: flex; align-items: center; gap: 8px; margin: 0 0 10px; color: var(--sf-ink); font-size: .86rem; font-weight: 900; white-space: nowrap; }
.sf-result-title span { color: var(--sf-muted); font-size: .7rem; }
.sf-result-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 9px; }
.sf-result-card { display: grid; grid-template-columns: 44px minmax(0,1fr) auto; align-items: center; gap: 11px; min-width: 0; padding: 11px; border: 1px solid var(--sf-line); border-radius: 12px; color: inherit; background: #fff; text-align: left; cursor: pointer; }
.sf-result-card:hover { border-color: #fca5a5; box-shadow: 0 6px 18px rgba(15,23,42,.06); }
.sf-result-thumb { display: grid; place-items: center; width: 44px; height: 44px; overflow: hidden; border-radius: 10px; color: var(--sf-red); background: #fef2f2; }
.sf-result-thumb img { width: 100%; height: 100%; object-fit: cover; }
.sf-result-card div { min-width: 0; }
.sf-result-card strong { display: block; overflow: hidden; color: var(--sf-ink); font-size: .79rem; text-overflow: ellipsis; white-space: nowrap; }
.sf-result-card small { display: block; overflow: hidden; margin-top: 4px; color: var(--sf-muted); font-size: .68rem; text-overflow: ellipsis; white-space: nowrap; }
.sf-result-card > i { color: #94a3b8; font-size: .72rem; }
.sf-citations { display: flex; flex-wrap: wrap; gap: 7px; }
.sf-citation { max-width: 100%; overflow: hidden; padding: 7px 9px; border-radius: 8px; color: #475569; background: #eef2f7; font-size: .68rem; font-weight: 700; text-overflow: ellipsis; white-space: nowrap; }
.sf-search-empty { display: grid; place-items: center; min-height: 260px; color: var(--sf-muted); text-align: center; }
.sf-search-empty i { margin-bottom: 13px; color: #cbd5e1; font-size: 2.5rem; }
.sf-search-empty h3 { margin: 0 0 6px; color: var(--sf-ink); font-size: 1rem; }
.sf-search-empty p { margin: 0; font-size: .8rem; }

@media (max-width: 760px) {
  .sf-daily { grid-template-columns: 1fr; min-height: 0; margin: 16px 0; border-radius: 16px; }
  .sf-daily-intro { display: grid; grid-template-columns: minmax(0,1fr) auto; align-items: center; gap: 8px; padding: 15px 16px; }
  .sf-daily-intro h2 { margin: 5px 0 0; font-size: clamp(.98rem, 4.5vw, 1.18rem); white-space: nowrap; }
  .sf-daily-intro p { display: none; }
  .sf-daily-progress { margin: 0; font-size: .65rem; }
  .sf-daily-progress strong { font-size: 1rem; }
  .sf-daily-main { padding: 13px 14px 15px; }
  .sf-daily-tabs { gap: 6px; }
  .sf-daily-tab { padding: 7px 9px; font-size: clamp(.59rem, 2.6vw, .7rem); }
  .sf-daily-content { grid-template-columns: 38px minmax(0,1fr); gap: 10px; min-height: 96px; padding-top: 12px; }
  .sf-daily-icon { width: 38px; height: 38px; border-radius: 11px; font-size: .9rem; }
  .sf-daily-copy small { font-size: .59rem; }
  .sf-daily-copy h3 { overflow: hidden; margin-bottom: 4px; font-size: clamp(.82rem, 3.6vw, .98rem); text-overflow: ellipsis; white-space: nowrap; }
  .sf-daily-copy p { display: -webkit-box; overflow: hidden; font-size: clamp(.69rem, 3vw, .78rem); line-height: 1.42; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
  .sf-learned-btn { grid-column: 1 / -1; justify-content: center; width: 100%; padding: 8px; font-size: .69rem; }
  .sf-timeline { margin: 20px 0; padding: 16px 14px; border-radius: 16px; }
  .sf-section-head { align-items: center; margin-bottom: 12px; }
  .sf-section-kicker { font-size: .58rem; }
  .sf-section-head h2 { font-size: clamp(.98rem, 4.4vw, 1.2rem); white-space: nowrap; }
  .sf-icon-btn { width: 32px; height: 32px; border-radius: 9px; }
  .sf-periods { gap: 6px; padding-bottom: 10px; }
  .sf-period { padding: 6px 9px; font-size: clamp(.58rem, 2.5vw, .68rem); }
  .sf-timeline-track { gap: 11px; margin-right: -14px; padding: 18px 14px 11px 1px; }
  .sf-event { flex-basis: min(78vw, 260px); border-radius: 14px; }
  .sf-event-image { height: 96px; }
  .sf-event-body { padding: 12px; }
  .sf-event h3 { min-height: 0; overflow: hidden; font-size: .84rem; text-overflow: ellipsis; white-space: nowrap; }
  .sf-event p { min-height: 38px; font-size: .69rem; -webkit-line-clamp: 2; }
  .sf-event-buttons button { font-size: .63rem; }
  .sf-compare { padding: 10px; }
  .sf-compare span, .sf-compare button { font-size: .65rem; }
  .sf-compare-modal { padding: 18px 14px; border-radius: 16px; }
  .sf-compare-grid { grid-template-columns: 1fr; }
  .sf-compare-grid article { padding: 13px; }
  .sf-compare-grid p { font-size: .72rem; }
  .search-hub-modal.sf-upgraded { padding: 0; }
  .sf-search-shell { width: 100%; height: 100dvh; border: 0; border-radius: 0; }
  .sf-search-head { padding: 12px 12px 10px; }
  .sf-search-brand { margin-bottom: 9px; }
  .sf-search-brand span { font-size: .7rem; }
  .sf-search-input-wrap { gap: 7px; padding: 0 9px; border-radius: 11px; }
  #searchHubInput.sf-input { height: 46px; font-size: clamp(.75rem, 3.4vw, .88rem); }
  .sf-search-go { padding: 8px 9px; font-size: .65rem; }
  .sf-search-tabs { gap: 6px; padding: 9px 12px; }
  .sf-search-tab { padding: 6px 9px; font-size: clamp(.58rem, 2.55vw, .68rem); }
  .sf-search-body { padding: 12px; }
  .sf-search-answer { margin-bottom: 13px; padding: 12px; }
  .sf-search-answer-head { font-size: .64rem; }
  .sf-search-answer p { display: -webkit-box; overflow: hidden; font-size: .75rem; line-height: 1.48; -webkit-line-clamp: 4; -webkit-box-orient: vertical; }
  .sf-result-section { margin-bottom: 15px; }
  .sf-result-title { font-size: .74rem; }
  .sf-result-grid { grid-template-columns: 1fr; gap: 7px; }
  .sf-result-card { grid-template-columns: 38px minmax(0,1fr) auto; gap: 9px; padding: 8px; }
  .sf-result-thumb { width: 38px; height: 38px; }
  .sf-result-card strong { font-size: .72rem; }
  .sf-result-card small { font-size: .62rem; }
}

@media (prefers-reduced-motion: reduce) {
  .sf-timeline-track { scroll-behavior: auto !important; }
}