:root {
  color-scheme: light;
  --cass-blue: #4abfed;
  --cass-purple: #7b68ae;
  --cass-orange: #f5a623;
  --page: #4abfed;
  --panel: #ffffff;
  --panel-soft: #f5f8fb;
  --ink: #172033;
  --muted: #5c6879;
  --line: #d7e0e8;
  --input: #ffffff;
  --shadow: 0 18px 45px rgba(20, 58, 82, .2);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #111827;
  --panel: #1f2937;
  --panel-soft: #273449;
  --ink: #f8fafc;
  --muted: #cbd5e1;
  --line: #475569;
  --input: #111827;
  --shadow: 0 18px 45px rgba(0, 0, 0, .4);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: var(--page);
  padding: 24px;
  transition: background .2s ease, color .2s ease;
}
.card, .admin {
  position: relative;
  max-width: 780px;
  margin: 7vh auto;
  background: var(--panel);
  border: 1px solid color-mix(in srgb, var(--line), transparent 20%);
  border-radius: 24px;
  padding: clamp(26px, 5vw, 48px);
  box-shadow: var(--shadow);
}
.admin { max-width: 1180px; margin: 24px auto; }
.narrow { max-width: 480px; }
.wide { max-width: 900px; }
.theme-toggle {
  position: fixed;
  z-index: 5;
  top: 16px;
  right: 16px;
  margin: 0;
  padding: 9px 14px;
  background: var(--panel);
  color: var(--ink);
  border: 1px solid var(--line);
  box-shadow: 0 4px 14px rgba(0, 0, 0, .12);
  font-size: .85rem;
}
.eyebrow, .category {
  margin: 0 0 8px;
  color: var(--cass-purple);
  font-size: .85rem;
  font-weight: 800;
  letter-spacing: .13em;
  text-transform: uppercase;
}
.category {
  display: inline-block;
  margin-top: 28px;
  padding: 8px 12px;
  color: #fff;
  background: var(--cass-purple);
  border-radius: 999px;
  letter-spacing: .09em;
}
h1 { font-size: clamp(2rem, 6vw, 4rem); line-height: 1.02; margin: .3em 0; }
h2 { font-size: 1.5rem; }
p { line-height: 1.6; color: var(--muted); }
label { display: block; font-weight: 700; margin: 18px 0 8px; }
input, textarea {
  width: 100%;
  border: 2px solid var(--line);
  border-radius: 12px;
  background: var(--input);
  color: var(--ink);
  padding: 14px;
  font: inherit;
}
input:focus, textarea:focus { outline: 4px solid rgba(123, 104, 174, .2); border-color: var(--cass-purple); }
button, .button {
  display: inline-block;
  border: 0;
  border-radius: 12px;
  background: var(--cass-purple);
  color: #fff;
  font: inherit;
  font-weight: 800;
  padding: 14px 22px;
  cursor: pointer;
  text-decoration: none;
  margin-top: 12px;
}
button:hover, .button:hover { filter: brightness(.95); }
button:disabled { opacity: .55; }
.secondary { background: #64748b; color: #fff; }
.small { padding: 9px 14px; font-size: .85rem; }
.notice { border-left: 5px solid var(--cass-orange); background: var(--panel-soft); padding: 16px; line-height: 1.5; }
.quizhead { display: flex; align-items: center; justify-content: space-between; color: var(--muted); font-weight: 800; }
.quizhead strong {
  min-width: 84px;
  padding: 8px 12px;
  color: #fff;
  background: var(--cass-orange);
  border-radius: 12px;
  font-variant-numeric: tabular-nums;
  font-size: 1.35rem;
  text-align: center;
}
.prompt {
  max-width: none;
  font-size: clamp(1.45rem, 3.2vw, 2.25rem);
  font-weight: 750;
  line-height: 1.28;
  letter-spacing: -.02em;
  margin: 18px 0 28px;
}
.quiz label { margin-top: 0; }
.quiz input { min-height: 58px; font-size: 1.3rem; }
.submit-answer { width: 100%; min-height: 64px; margin-top: 16px; font-size: 1.25rem; border-radius: 14px; }
.muted { font-size: .85rem; }
.panel { border-top: 1px solid var(--line); padding: 24px 0; }
.table { overflow: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.review { display: grid; grid-template-columns: 60px 1fr 100px 1fr auto auto; gap: 10px; align-items: center; padding: 10px 0; border-bottom: 1px solid var(--line); }
code { color: var(--cass-purple); }
.question-list { display: grid; gap: 14px; }
.admin-actions { display: flex; flex-wrap: wrap; gap: 16px; align-items: end; }
.admin-actions form { min-width: 210px; }
.admin-actions label { margin: 0; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-grid label { margin-top: 0; }
.step-label { margin: 0; color: var(--cass-purple); font-size: .78rem; font-weight: 900; letter-spacing: .12em; text-transform: uppercase; }
.invite-summary { display: grid; grid-template-columns: repeat(4, minmax(120px, 1fr)); gap: 12px; margin: 18px 0; }
.invite-summary div, .action-card { padding: 18px; background: var(--panel-soft); border: 1px solid var(--line); border-radius: 16px; }
.invite-summary strong { display: block; color: var(--cass-purple); font-size: 1.8rem; }
.invite-summary span { color: var(--muted); font-size: .86rem; font-weight: 700; }
.invitation-steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; margin-top: 18px; }
.action-card { display: flex; flex-direction: column; }
.action-card h3 { margin: 6px 0; }
.action-card p:not(.step-label) { flex: 1; margin-top: 4px; color: var(--muted); }
.action-card form { margin-top: auto; }
.action-card label { margin-top: 0; }
.send-real { background: var(--cass-orange); }
.question-editor {
  display: grid;
  grid-template-columns: 52px minmax(120px, .7fr) minmax(280px, 2fr) minmax(180px, 1fr) minmax(180px, 1fr) auto;
  gap: 12px;
  align-items: end;
  padding: 16px;
  background: var(--panel-soft);
  border: 1px solid var(--line);
  border-radius: 16px;
}
.question-editor label { margin: 0; font-size: .8rem; }
.question-editor input, .question-editor textarea { margin-top: 6px; padding: 10px; font-size: .9rem; }
.question-editor button { margin: 0; }
.question-number { align-self: center; color: var(--cass-purple); font-size: 1.35rem; font-weight: 900; text-align: center; }
@media (max-width: 900px) {
  .question-editor { grid-template-columns: 44px 1fr; }
  .question-editor label, .question-editor button { grid-column: 2; }
  .invitation-steps { grid-template-columns: 1fr; }
}
@media (max-width: 750px) {
  body { padding: 12px; }
  .card { margin: 5vh auto; border-radius: 18px; padding: 24px 20px; }
  .theme-toggle { top: 10px; right: 10px; }
  .prompt { font-size: clamp(1.35rem, 5.5vw, 1.9rem); }
  .review { grid-template-columns: 1fr; }
  .admin { padding: 20px; }
  .invite-summary { grid-template-columns: 1fr 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  h1 { font-size: 2.25rem; }
}