:root {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color-scheme: light;
  --page: #F4F9FA;
  --ink: #1C3D46;
  --muted: #55747B;
  --teal-deep: #126574;
  --teal: #0E7F6C;
  --teal-hover: #0B6D77;
  --teal-soft: #E8F4F6;
  --mint-accent: #3DB895;
  --border: #D2E5E9;
  --card: #ffffff;
  --correct-bg: #DDF2EC;
  --correct-border: #2F8A71;
  --correct-ink: #1F5F50;
  --wrong-bg: #F7E6E1;
  --wrong-border: #C47A6D;
  --wrong-ink: #8B4C42;
  background: var(--page);
  color: var(--ink);
}
* { box-sizing: border-box; }
body { margin: 0; }
header { background: var(--teal-deep); color: #fff; padding: 19px 18px; }
header > div, main, footer { max-width: 750px; margin: auto; }
.header-content { display: flex; align-items: center; gap: 16px; }
.header-logo { width: 52px; height: 52px; flex: 0 0 52px; object-fit: contain; }
.header-copy { min-width: 0; }
h1 { font-size: 1.8rem; margin: 0; letter-spacing: -.035em; color: #ffffff; }
header p { margin: 6px 0 0; color: #E0F3F4; }
main { padding: 26px 18px; }
.controls { display: flex; gap: 18px; flex-wrap: wrap; align-items: end; justify-content: space-between; }
label { display: grid; gap: 7px; font-size: .95rem; font-weight: 650; }
select { background: #FCFEFF; border: 1px solid #B5D5DC; border-radius: 10px; padding: 11px 12px; color: var(--ink); font: inherit; min-width: 145px; }
.stats { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; color: var(--muted); margin: 19px 0; font-size: .9rem; }
.panel { background: var(--card); border: 1px solid var(--border); border-radius: 18px; text-align: center; padding: 34px 26px; box-shadow: 0 10px 35px rgba(18,101,116,.10); }
.eyebrow { text-transform: uppercase; font-size: .78rem; color: var(--teal); letter-spacing: .1em; font-weight: 700; }
.word { font-weight: 760; font-size: clamp(2rem,7vw,3.45rem); margin: 14px 0; overflow-wrap: anywhere; letter-spacing: -.04em; }
.definition { font-size: 1.07rem; line-height: 1.6; max-width: 520px; margin: 0 auto 26px; color: #41646C; }
.answers { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 12px; }
button { cursor: pointer; font: inherit; border-radius: 12px; border: 1px solid #B5D5DC; padding: 14px; background: #EDF6F8; color: var(--teal-deep); font-weight: 700; transition: background-color .14s ease, border-color .14s ease; }
.answers button { font-size: 1.22rem; }
button:hover:not(:disabled) { background: #DDF0F3; border-color: #3998A5; }
button:focus-visible, select:focus-visible, footer a:focus-visible { outline: 3px solid var(--mint-accent); outline-offset: 3px; box-shadow: 0 0 0 5px rgba(14,127,108,.14); }
button:disabled { cursor: default; opacity: .70; }
.answers button.correct { background: var(--correct-bg); border-color: var(--correct-border); color: var(--correct-ink); opacity: 1; }
.answers button.wrong { background: var(--wrong-bg); border-color: var(--wrong-border); color: var(--wrong-ink); opacity: 1; }
.feedback { min-height: 30px; margin-top: 20px; font-weight: 650; }
.suffix-hint { margin: 2px auto 12px; max-width: 530px; color: #41646C; font-size: .94rem; line-height: 1.5; }
.actions { display: flex; gap: 10px; align-items: center; justify-content: center; flex-wrap: wrap; margin-top: 12px; }
.primary { background: var(--teal); color: white; border-color: var(--teal); }
.primary:hover:not(:disabled) { background: var(--teal-hover); border-color: var(--teal-hover); }
.secondary { font-size: .94rem; background: #ECF6F8; border-color: #A9D5DE; }
.fact { font-size: .94rem; text-align: left; background: var(--teal-soft); border-radius: 10px; max-width: 530px; padding: 15px; margin: 17px auto 0; line-height: 1.5; color: #42636C; }
.muted { color: var(--muted); font-size: .87rem; line-height: 1.5; }
.hidden { display: none!important; }
.error { color: var(--wrong-ink); }
footer { padding: 0 18px 30px; color: var(--muted); font-size: .87rem; line-height: 1.5; font-family: inherit; }
footer a { color: var(--teal-deep); text-underline-offset: 3px; }
.notice { background: var(--teal-soft); border-radius: 10px; padding: 13px 15px; margin: 15px 0; }
.review-note { font-size: .86rem; color: var(--muted); margin-top: 10px; }
@media(max-width:480px) { .header-logo { width: 44px; height: 44px; flex-basis: 44px; } .header-content { gap: 12px; } h1 { font-size: 1.6rem; } header { padding: 17px 14px; } main { padding: 18px 12px; } .panel { padding: 30px 15px; } .answers { gap: 7px; } .answers button { padding: 14px 5px; } }