:root {
  color-scheme: dark;
  --bg: #0f1419;
  --panel: #161b22;
  --panel2: #1c2330;
  --ink: #e6edf3;
  --ink-dim: #9fb0c3;
  --line: #2a3341;
  --accent: #4aa3ff;
  --accent2: #7c5cff;
  --good: #7ee787;
  --good-bg: #0f2a17;
  --warn: #f2cc60;
  --warn-bg: #2a2109;
  --code: #0b0f14;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.6;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
#resources-root a { text-decoration: underline; text-underline-offset: .15em; }
header {
  padding: 34px clamp(18px, 5vw, 64px);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(135deg, #12233d, #1a1436);
}
.eyebrow {
  margin: 0 0 8px;
  color: var(--warn);
  font-size: .85rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}
h1 { margin: 0 0 10px; font-size: clamp(2rem, 5vw, 4rem); line-height: 1.05; }
h2 { margin: 0 0 14px; font-size: 1.65rem; line-height: 1.2; }
h3 { margin: 22px 0 10px; color: #cbe3ff; }
p { margin: 0 0 14px; }
nav { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
nav a, .chip {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 12px;
  background: #0d1826;
  color: var(--ink);
  font-weight: 700;
}
main { width: min(1180px, calc(100% - 32px)); margin: 0 auto; padding: 28px 0 64px; }
.panel, .card, details.qa {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}
.panel, .card { padding: 16px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(245px, 1fr)); gap: 12px; }
.toolbar {
  position: sticky;
  top: 0;
  z-index: 10;
  margin: 20px 0;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  background: rgba(15, 20, 25, .94);
  backdrop-filter: blur(10px);
}
input[type="search"] {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  background: #0b1118;
  color: var(--ink);
  font-size: 1rem;
}
.stats { margin-top: 10px; color: var(--ink-dim); font-size: .95rem; }
.section { margin-top: 30px; padding-top: 22px; border-top: 1px solid var(--line); }
.tag {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  border-radius: 999px;
  padding: 2px 9px;
  margin-bottom: 8px;
  background: var(--warn-bg);
  color: var(--warn);
  font-size: .78rem;
  font-weight: 800;
}
.card p { color: var(--ink-dim); }
details.qa { margin: 10px 0; overflow: hidden; }
summary { cursor: pointer; padding: 13px 15px; color: #dbeafe; font-weight: 750; }
summary:hover { background: var(--panel2); }
.answer { padding: 0 15px 15px; }
.choices { margin: 0; padding-left: 24px; }
.choices li { margin: 5px 0; padding: 4px 6px; border-radius: 6px; }
.choices li.correct { background: var(--good-bg); color: var(--good); }
.answer-status {
  display: inline-block;
  border: 1px solid currentColor;
  border-radius: 999px;
  padding: 1px 7px;
  font-size: .78rem;
  line-height: 1.5;
}
.why {
  margin-top: 10px;
  border-left: 3px solid var(--accent);
  padding: 9px 12px;
  background: #0d1f33;
  color: #d7ebff;
}
code {
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1px 5px;
  background: var(--code);
  color: #cdd9e5;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: .9em;
}
table { width: 100%; border-collapse: collapse; overflow: hidden; border-radius: 8px; }
th, td { border: 1px solid var(--line); padding: 10px; vertical-align: top; }
th { background: #102034; color: #cbe3ff; text-align: left; }
tr:nth-child(even) td { background: #12171f; }
.hidden { display: none; }