:root {
  --bg: linear-gradient(180deg, #0c1022 0%, #0d132b 100%);
  --bg-spot-a: rgba(34, 211, 238, 0.15);
  --bg-spot-b: rgba(249, 115, 22, 0.18);
  --paper: rgba(255, 255, 255, 0.06);
  --stroke: rgba(255, 255, 255, 0.18);
  --ink: #e9ecf8;
  --muted: #9fa8ba;
  --accent: #f97316;
  --accent-2: #22d3ee;
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.55);
  --tag-bg: rgba(255, 255, 255, 0.06);
  --input-glow: 0 0 0 3px rgba(249, 115, 22, 0.25);
  --chip-active-bg: rgba(255, 255, 255, 0.16);
  --chip-active-border: rgba(255, 255, 255, 0.38);
}

[data-theme="light"] {
  --bg: linear-gradient(180deg, #f7f9fd 0%, #e8eeff 100%);
  --bg-spot-a: rgba(34, 182, 238, 0.12);
  --bg-spot-b: rgba(255, 180, 120, 0.16);
  --paper: rgba(255, 255, 255, 0.9);
  --stroke: rgba(20, 30, 60, 0.14);
  --ink: #141b2f;
  --muted: #5d667d;
  --shadow: 0 24px 60px rgba(15, 23, 42, 0.18);
  --tag-bg: rgba(12, 19, 43, 0.06);
  --input-glow: 0 0 0 3px rgba(28, 181, 224, 0.2);
  --chip-active-bg: rgba(12, 19, 43, 0.08);
  --chip-active-border: rgba(12, 19, 43, 0.25);
}

* {
  box-sizing: border-box;
}

html {
  overflow-x: hidden;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Manrope', 'Space Grotesk', 'Helvetica Neue', sans-serif;
  background:
    radial-gradient(120% 120% at 15% 20%, var(--bg-spot-a), transparent),
    radial-gradient(100% 100% at 85% 10%, var(--bg-spot-b), transparent),
    var(--bg);
  color: var(--ink);
  padding: 32px 22px 48px;
  transition: background 0.3s ease, color 0.2s ease;
  position: relative;
  overflow-x: hidden;
}

.shell {
  width: min(1180px, 100%);
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero {
  margin-bottom: 18px;
  display: grid;
  gap: 12px;
}

.hero-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  overflow: visible;
}

.eyebrow-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(280px, 1fr);
  gap: 16px;
  align-items: start;
}

.content-left {
  display: grid;
  gap: 12px;
  align-content: start;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 12px;
  font-weight: 600;
}

.eyebrow::before {
  content: '';
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  filter: drop-shadow(0 0 12px rgba(249, 115, 22, 0.7));
}

h1 {
  font-family: 'Space Grotesk', 'Manrope', sans-serif;
  font-size: clamp(28px, 4vw, 42px);
  letter-spacing: -0.02em;
  margin: 0;
}

.lede {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.6;
  max-width: 820px;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-top: 6px;
}

.controls input {
  flex: 1;
  min-width: 220px;
  background: var(--paper);
  border: 1px solid var(--stroke);
  color: var(--ink);
  padding: 12px 14px;
  border-radius: 12px;
  font-size: 15px;
  backdrop-filter: blur(8px);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.controls input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--input-glow);
}

.count {
  color: var(--muted);
  font-weight: 600;
  font-size: 14px;
}

.theme-icon {
  margin-left: auto;
}

.category-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 6px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--tag-bg);
  border: 1px solid var(--stroke);
  color: var(--ink);
  padding: 9px 12px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.16);
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}

.chip:hover {
  transform: translateY(-1px);
  border-color: rgba(249, 115, 22, 0.55);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.18);
}

.chip.active {
  background: var(--chip-active-bg);
  color: var(--ink);
  border-color: var(--chip-active-border);
}

.chip:active {
  transform: translateY(0);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.3);
}

.random-card {
  background: var(--paper);
  border: 1px solid var(--stroke);
  border-radius: 16px;
  padding: 16px 16px 48px;
  position: relative;
  overflow: visible;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.16);
  display: grid;
  gap: 12px;
  align-content: start;
  align-self: start;
}

.random-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.random-left {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.random-title {
  font-weight: 700;
  letter-spacing: 0.02em;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--tag-bg);
  border: 1px solid var(--stroke);
  color: var(--ink);
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 12px;
  text-transform: capitalize;
  white-space: nowrap;
}

.tag.small {
  font-size: 11px;
  margin: 4px 6px 0 0;
  gap: 4px;
}

.random-text {
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.6;
}

.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--chip-active-border);
  background: var(--chip-active-bg);
  color: var(--ink);
  font-weight: 800;
  font-size: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.16);
  transition: transform 0.15s ease, box-shadow 0.15s ease, filter 0.15s ease, background 0.15s ease;
}

.icon-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.18);
  filter: saturate(1.05);
}

.icon-btn:active {
  transform: translateY(0);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.3);
}

.icon-btn i {
  line-height: 1;
}

.chip i,
.tag i {
  line-height: 1;
}

@media (hover: hover) and (pointer: fine) {
  .has-tooltip {
    position: relative;
    z-index: 2;
  }

  .has-tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 10px);
    left: 50%;
    transform: translate(-50%, 0);
    background: rgba(12, 19, 43, 0.9);
    color: #fff;
    padding: 6px 9px;
    border-radius: 8px;
    font-size: 12px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease, transform 0.15s ease;
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.3);
    z-index: 9999;
  }

  .has-tooltip::before {
    content: '';
    position: absolute;
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: rgba(12, 19, 43, 0.9);
    opacity: 0;
    transition: opacity 0.15s ease, transform 0.15s ease;
    z-index: 9999;
    pointer-events: none;
  }

  .has-tooltip:hover::after,
  .has-tooltip:hover::before {
    opacity: 1;
    transform: translate(-50%, -2px);
  }

  .has-tooltip.tooltip-right::after {
    left: auto;
    right: 0;
    transform: translate(0, 0);
  }

  .has-tooltip.tooltip-right::before {
    left: auto;
    right: 12px;
    transform: translate(0, 0);
  }

  .has-tooltip.tooltip-right:hover::after,
  .has-tooltip.tooltip-right:hover::before {
    transform: translate(0, -2px);
  }
}

main {
  background: var(--paper);
  border: 1px solid var(--stroke);
  border-radius: 18px;
  padding: 18px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.24);
}

main::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 120% at 80% 0, rgba(34, 211, 238, 0.08), transparent);
  pointer-events: none;
}

ol {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  counter-reset: fact-counter;
}

li {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--stroke);
  border-radius: 14px;
  padding: 14px 16px 48px 16px;
  line-height: 1.5;
  color: var(--ink);
  backdrop-filter: blur(10px);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.16);
  transition: border-color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
  counter-increment: fact-counter;
}

li::before {
  content: '';
}

li:hover {
  border-color: rgba(249, 115, 22, 0.55);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.18);
}

.fact-text {
  margin: 0 0 6px;
}

.fact-title {
  margin: 0 0 8px;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.fact-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  position: absolute;
  right: 12px;
  bottom: 12px;
}

.random-tags {
  position: absolute;
  right: 12px;
  bottom: 12px;
  left: 12px;
  justify-content: flex-start;
}

.glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  filter: blur(60px);
  opacity: 0.35;
  overflow: hidden;
}

.glow .blob {
  position: absolute;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), transparent);
}

.glow .blob.b2 {
  background: linear-gradient(135deg, var(--accent-2), transparent);
}

.glow .blob.b1 { top: -120px; left: -60px; }
.glow .blob.b2 { bottom: -160px; right: -80px; }

@media (max-width: 900px) {
  .hero-head {
    align-items: flex-start;
  }

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

@media (max-width: 640px) {
  body {
    padding: 22px 16px 34px;
  }

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

  .controls input {
    width: 100%;
  }

  ol {
    grid-template-columns: 1fr;
  }
}