:root {
  --bg: #120e10;
  --panel: #1c1518;
  --ink: #f6eef0;
  --muted: #b89aa3;
  --line: #3c2c32;
  --amber: #e24b4b;
  --good: #3dbf7a;
  --bad: #e05b5b;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  background: radial-gradient(1200px 500px at 10% -10%, #3a1418, transparent 55%), var(--bg);
  color: var(--ink);
  font: 16px/1.45 "Avenir Next", "Segoe UI", sans-serif;
}
a { color: var(--amber); }
.app { max-width: 920px; margin: 0 auto; padding: 28px 18px 64px; }
.topbar { display: flex; justify-content: space-between; gap: 24px; align-items: flex-end; margin-bottom: 22px; }
.eyebrow { margin: 0; color: var(--amber); letter-spacing: 0.08em; text-transform: uppercase; font-size: 12px; font-weight: 700; }
h1, h2, h3 { margin: 4px 0 0; letter-spacing: -0.02em; }
.disclaimer { max-width: 360px; color: var(--muted); font-size: 13px; margin: 0; }
.tabs { display: flex; gap: 8px; margin-bottom: 18px; }
.tabs button, .chip, select, .actions button {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  border-radius: 999px;
  padding: 8px 14px;
  cursor: pointer;
}
.tabs button[aria-current="page"], .chip.active { background: var(--amber); color: #1a0406; border-color: var(--amber); }
.hero, .study-order, .question-card, .result-card, .flip-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 22px;
  box-shadow: var(--shadow);
}
.hero p, .study-order p { color: var(--muted); }
.study-order details { margin: 10px 0; }
.study-order summary { cursor: pointer; font-weight: 700; color: var(--ink); }
.study-order details p { margin: 8px 0 0; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 12px; margin: 16px 0; }
.card {
  text-align: left;
  background: #160f12;
  border: 1px solid var(--line);
  color: var(--ink);
  border-radius: 16px;
  padding: 16px;
  cursor: pointer;
  min-height: 150px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.card:hover { border-color: var(--amber); }
.card .kicker { color: var(--amber); font-size: 12px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; }
.card span:last-child { color: var(--muted); font-size: 14px; }
.compact .card { min-height: 88px; }
.quiz-bar { display: flex; justify-content: space-between; gap: 16px; align-items: center; margin-bottom: 14px; }
.meter { flex: 1; height: 8px; background: #0d0a0c; border-radius: 99px; overflow: hidden; max-width: 280px; }
.meter span { display: block; height: 100%; width: 0; background: var(--amber); }
.topic { color: var(--amber); font-size: 13px; margin: 0 0 8px; }
.choices { display: grid; gap: 8px; margin-top: 16px; }
.choices button {
  text-align: left;
  background: #140e10;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  cursor: pointer;
}
.choices button.correct { border-color: var(--good); background: #163226; }
.choices button.wrong { border-color: var(--bad); background: #351818; }
.explain { color: #d5e0ea; background: #140e10; border-radius: 12px; padding: 12px; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
.actions button { background: var(--amber); color: #1a0406; font-weight: 700; }
.actions button.ghost { background: transparent; color: var(--ink); }
.missed { color: var(--muted); }
.flip-card {
  width: 100%;
  min-height: 280px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 12px;
  cursor: pointer;
}
.flip-card strong { font-size: 24px; line-height: 1.3; }
.flip-card em { color: var(--muted); font-style: normal; }
.flash-filters { display: flex; gap: 6px; flex-wrap: wrap; }
select { max-width: 100%; }
.bank-list { display: grid; gap: 10px; }
.bank-item { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 14px 16px; }
.bank-item .ans { color: var(--good); margin: 8px 0 0; }
.hidden { display: none; }
.support {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 18px 22px;
  margin: 0 0 16px;
}
.support.quiet {
  margin-top: 28px;
  background: transparent;
  box-shadow: none;
}
.lab-cta { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin: 16px 0 8px; }
.start-main {
  background: var(--amber);
  color: #1a1204;
  font-weight: 800;
  border: 0;
  border-radius: 999px;
  padding: 12px 20px;
  cursor: pointer;
  font: inherit;
}
.start-side {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 10px 16px;
  cursor: pointer;
  font: inherit;
}
.metrics { color: var(--muted); font-size: 15px; margin: 10px 0; }
.howto { color: var(--muted); font-size: 14px; margin: 0 0 10px; }
.result-card .support {
  margin: 16px 0 0;
  padding: 16px;
  box-shadow: none;
}
.support p { color: var(--muted); margin: 8px 0 0; font-size: 14px; }
.support strong { display: block; margin-top: 4px; }
.support-amounts { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 14px; }
.tip-btn {
  display: inline-flex;
  flex-direction: row;
  gap: 2px;
  min-width: 0;
  border: 1px solid var(--amber);
  background: var(--amber);
  color: #1a0406;
  border-radius: 12px;
  padding: 10px 14px;
  font-weight: 700;
  text-decoration: none;
}
.tip-btn span { font-weight: 600; font-size: 12px; color: #5a1218; }
.tip-btn.disabled {
  background: #160f12;
  color: var(--muted);
  border-color: var(--line);
  cursor: default;
}
.tip-btn.disabled span { color: var(--muted); }
.tip-other { font-size: 13px; }
.crypto-row { margin: 10px 0 0; }
.crypto-row code { word-break: break-all; }
.tip-copy {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  border-radius: 999px;
  padding: 6px 12px;
  cursor: pointer;
  font: inherit;
}
.materials {
  display: grid;
  gap: 10px;
  margin: 12px 0 0;
}
.materials article {
  background: #160f12;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px 16px;
}
.materials h4 { margin: 0 0 6px; font-size: 15px; }
.materials p, .materials li { color: var(--muted); font-size: 14px; }
.materials ul { margin: 6px 0 0; padding-left: 18px; }
.legal-foot {
  margin-top: 36px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
  max-width: 720px;
}
.legal-foot p { margin: 0 0 8px; }
.edu-bar {
  color: var(--muted);
  font-size: 13px;
  margin: 0 0 18px;
  max-width: 720px;
}
.sources { color: var(--muted); font-size: 14px; }
.sources a { color: var(--amber); }
@media (max-width: 700px) {
  .topbar, .quiz-bar { flex-direction: column; align-items: flex-start; }
  .disclaimer { max-width: none; }
}