:root {
  --accent: #DF2935;
  --accent-dim: #a91a23;
  --accent-soft: rgb(223, 42, 54, 0.12);
  --amber-soft: rgba(139, 127, 255, 0.12);
  --amber: #f0b255;
  --danger: #f0655a;

  --shadow-panel: 0 20px 60px rgba(0, 0, 0, 0.45);
  --font-display: "Space Grotesk", sans-serif;
  --font-body: "Inter", sans-serif;
  --font-mono: "JetBrains Mono", monospace;
}

[data-theme="light"] {
  --bg-primary: #f5f6f8;
  --surface-primary: #ffffff;
  --surface-secondary: #eff1f4;
  --border-primary: #dee1e7;
  --input-bg: #d8d8d8;
  --text-primary: #14161b;
  --muted: #5c6373;
  --text-secondary: #9096a3;
  --accent: #DF2935;
  --accent-dim: #DF2935;
  --accent-soft: rgb(223, 41, 53, 0.1);
  --amber-soft: rgba(108, 93, 211, 0.1);
  --amber: #c8811f;
  --shadow-panel: 0 16px 40px rgba(20, 22, 27, 0.1);
}

* {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
  padding: 0;
}
body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  transition:
    background 0.25s ease,
    color 0.25s ease;
  min-height: 100vh;
}
a {
  color: inherit;
  text-decoration: none;
}
button {
  font-family: inherit;
  cursor: pointer;
}
::selection {
  background: var(--accent-soft);
  color: var(--accent);
}

/* ---------- Top bar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 28px;
  max-width: 1240px;
  margin: 0 auto;
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.02em;
  cursor: pointer;
}
.logo .mark {
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: #0a0c11;
  font-weight: 700;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}
.theme-toggle {
  width: 42px;
  height: 24px;
  border-radius: 999px;
  background: var(--surface-primary);
  border: 1px solid var(--border-primary);
  position: relative;
  padding: 0;
  transition: background 0.2s;
}
.theme-toggle::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}
[data-theme="light"] .theme-toggle::after {
  transform: translateX(18px);
}

/* ---------- Home hero ---------- */
.home-wrap {
  min-height: calc(100vh - 70px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.home-wrap.hidden {
  display: none;
}

.home-mark {
  width: 76px;
  height: 76px;
  border-radius: 22px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 34px;
  font-weight: 700;
  color: #0a0c11;
  margin-bottom: 22px;
  position: relative;
}
.home-title {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin: 0 0 6px;
}
.home-sub {
  color: var(--muted);
  font-size: 14px;
  margin: 0 0 34px;
}

.search-shell {
  width: 100%;
  max-width: 620px;
  position: relative;
}
.search-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--input-bg);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: 0 var(--space-xs) 0 calc(var(--space-sm) + 4px);
  position: relative;
  transition:
    border-color 0.2s,
    box-shadow 0.2s;
}
.search-bar.focused {
  border-color: var(--accent-dim);
  box-shadow:
    0 0 0 4px var(--accent-soft),
    0 12px 30px rgba(0, 0, 0, 0.25);
}
.search-bar svg {
  flex-shrink: 0;
  color: var(--text-secondary);
}
.search-bar.focused svg.icon-search {
  color: var(--accent);
}
.search-input {
  flex: 1;
    padding: var(--space-md);
  background: none;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 16px;
  font-family: var(--font-body);
}
.search-input::placeholder {
  color: var(--text-secondary);
}
.clear-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  display: none;
  padding: 4px;
  border-radius: 50%;
}
.clear-btn.show {
  display: flex;
}
.clear-btn:hover {
  color: var(--text-primary);
  background: var(--surface-primary);
}
#searchBtn {
  background: var(--accent);
  border: none;
  color: var(--text-secondary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  display: flex;
}
#searchBtn:hover {
  color: var(--accent-dim);
}

.suggest-panel {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: var(--surface-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-panel);
  overflow: hidden;
  z-index: 20;
  display: none;
}
.suggest-panel.show {
  display: block;
}
.suggest-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 18px;
  font-size: 14px;
  color: var(--muted);
  cursor: pointer;
}
.suggest-item:hover,
.suggest-item.active {
  background: var(--surface-primary);
  color: var(--text-primary);
}
.suggest-item svg {
  color: var(--text-secondary);
  flex-shrink: 0;
}
.suggest-item b {
  color: var(--text-primary);
  font-weight: 600;
}

.search-actions {
  display: flex;
  gap: 12px;
  margin-top: 26px;
}
.btn {
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  background: var(--surface-primary);
  border: 1px solid var(--border-primary);
  color: var(--text-primary);
  font-size: 13.5px;
  font-weight: 500;
  transition:
    border-color 0.15s,
    transform 0.1s;
}
.btn:hover {
  border-color: var(--accent-dim);
}
.btn:active {
  transform: scale(0.97);
}
.btn.primary {
  background: var(--accent-soft);
  color: var(--text-secondary);
  border-color: transparent;
}

.trending-wrap {
  margin-top: 44px;
  text-align: center;
  max-width: 640px;
}
.trending-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-bottom: 12px;
  font-weight: 600;
}
.trending-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}
.chip {
  padding: 7px 14px;
  border-radius: 999px;
  background: var(--surface-primary);
  border: 1px solid var(--border-primary);
  color: var(--muted);
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 6px;
  transition:
    border-color 0.15s,
    color 0.15s;
}
.chip:hover {
  border-color: var(--accent-dim);
  color: var(--text-primary);
}
.chip .spark {
  color: var(--amber);
  font-size: 11px;
}

/* ---------- Results page ---------- */
.results-wrap {
  display: none;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 28px 60px;
}
.results-wrap.show {
  display: block;
}

.results-header {
  border-bottom: 1px solid var(--border-primary);
  padding-bottom: 14px;
}
.results-searchbar {
  display: flex;
  align-items: center;
  gap: 14px;
}
.results-searchbar .logo {
  flex-shrink: 0;
}
.results-search-shell {
  flex: 1;
  max-width: 640px;
  position: relative;
}
.results-search-shell .search-bar {
  border-radius: var(--radius-md);
}
.results-search-shell .search-input {
  font-size: 14px;
  padding: var(--space-sm);
}

.tabs {
  display: flex;
  gap: 4px;
  margin-top: 16px;
}
.tab {
  padding: 9px 4px;
  background: none;
  border: none;
  color: var(--muted);
  font-size: 13.5px;
  font-weight: 500;
  border-bottom: 2px solid transparent;
  margin-right: 20px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.tab.active {
  color: var(--text-primary);
  border-bottom-color: var(--accent);
}
.tab:hover:not(.active) {
  color: var(--text-primary);
}

.meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  color: var(--text-secondary);
  font-size: 12.5px;
  font-family: var(--font-mono);
  flex-wrap: wrap;
  gap: 10px;
}
.filter-chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.filter-chip {
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-family: var(--font-body);
  background: var(--surface-primary);
  border: 1px solid var(--border-primary);
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 5px;
}
.filter-chip:hover {
  color: var(--text-primary);
  border-color: var(--accent-dim);
}
.filter-chip.active {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: transparent;
}

.results-body {
  display: flex;
  gap: 44px;
  margin-top: 6px;
  align-items: flex-start;
}
.results-list {
  flex: 1;
  min-width: 0;
  max-width: 640px;
}

.result-card {
  padding: 18px 0;
  border-bottom: 1px solid var(--border-primary);
}
.result-card:first-child {
  padding-top: 4px;
}
.result-top {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}
.favicon {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  color: #0a0c11;
  flex-shrink: 0;
}
.result-site {
  font-size: 12.5px;
  color: var(--muted);
}
.result-url {
  font-size: 11.5px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}
.result-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 2px 0 6px;
  cursor: pointer;
  line-height: 1.3;
}
.result-title:hover {
  color: var(--accent);
}
.result-snippet {
  font-size: 13.5px;
  color: var(--muted);
  line-height: 1.55;
  margin: 0;
}
.result-snippet mark {
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 3px;
  padding: 0 2px;
}

.no-results {
  text-align: center;
  padding: 60px 20px;
  color: var(--muted);
}
.no-results .big {
  font-size: 15px;
  color: var(--text-primary);
  margin-bottom: 6px;
  font-weight: 600;
}

/* Knowledge panel */
.knowledge-panel {
  width: 100%;
  max-width: 450px;
  flex-shrink: 0;
  background: var(--surface-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  padding: 22px;
  position: sticky;
  top: 20px;
}
.kp-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--amber), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 24px;
  color: #0a0c11;
  margin-bottom: 14px;
}
.kp-title {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  margin: 0 0 3px;
}
.kp-category {
  font-size: 12.5px;
  color: var(--amber);
  margin: 0 0 14px;
  font-weight: 500;
}
.kp-desc {
  font-size: 13.5px;
  color: var(--muted);
  line-height: 1.6;
  margin: 0 0 18px;
}
.kp-facts {
  border-top: 1px solid var(--border-primary);
  padding-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.kp-fact {
  display: flex;
  justify-content: space-between;
  font-size: 12.5px;
  gap: 12px;
}
.kp-fact-label {
  color: var(--text-secondary);
}
.kp-fact-value {
  color: var(--text-primary);
  text-align: right;
  font-weight: 500;
}
.kp-links {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.kp-link {
  font-size: 12px;
  padding: 5px 10px;
  background: var(--amber-soft);
  color: var(--amber);
  border-radius: 999px;
}

/* Pagination */
.pagination {
  display: flex;
  align-items: center;
  gap: 6px;
  justify-content: center;
  margin: 34px 0 10px;
}
.page-btn {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: none;
  border: 1px solid transparent;
  color: var(--muted);
  font-size: 13px;
  font-family: var(--font-mono);
}
.page-btn:hover:not(.active):not(:disabled) {
  border-color: var(--border-primary);
  color: var(--text-primary);
}
.page-btn.active {
  background: var(--accent);
  color: #0a0c11;
  font-weight: 600;
}
.page-btn:disabled {
  opacity: 0.35;
  cursor: default;
}
.page-dots {
  color: var(--text-secondary);
  font-size: 13px;
  padding: 0 2px;
}

/* Responsive */
@media (max-width: 860px) {
  .results-body {
    flex-direction: column;
  }
  .knowledge-panel {
    width: 100%;
    max-width: fit-content;
    position: static;
    order: -1;
  }
  .results-list {
    max-width: none;
  }
}
@media (max-width: 560px) {
  .topbar {
    padding: 14px 16px;
  }
  .home-title {
    font-size: 30px;
  }
  .home-mark {
    width: 60px;
    height: 60px;
    font-size: 26px;
    border-radius: 18px;
  }
  .search-actions {
    flex-wrap: wrap;
    justify-content: center;
    width: 100%;
  }

  .results-wrap {
    padding: 0 16px 40px;
  }
  .results-searchbar .logo span {
    display: none;
  }
  .tabs {
    overflow-x: auto;
  }
  .tab {
    margin-right: 14px;
    white-space: nowrap;
  }
  .meta-row {
    font-size: 11.5px;
  }
}

.fade-in {
  animation: fadeIn 0.35s ease;
}
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}