:root{
  --paper: #F4EEDF;
  --paper-line: #E1D6BC;
  --ink: #262530;
  --ink-soft: #5B5A66;
  --red: #A73429;
  --red-soft: #C97A6F;
  --gold: #B08A2C;
  --green: #4C6A50;
  --white: #FFFDF7;
  --radius: 18px;
}
*{ box-sizing: border-box; }
html,body{
  margin:0; padding:0; min-height:100%;
  background: repeating-linear-gradient(to bottom, transparent, transparent 37px, var(--paper-line) 38px), var(--paper);
  color: var(--ink);
  font-family: "Source Serif 4", Georgia, serif;
}
.stage{
  min-height:100vh; display:flex; flex-direction:column; align-items:center;
  justify-content:flex-start; padding: 34px 20px 60px; max-width: 560px; margin: 0 auto;
}
.rings{ width: 128px; height: 128px; margin-bottom: 18px; flex-shrink:0; }
.ring{ fill:none; stroke: var(--paper-line); stroke-width: 4; transition: stroke 0.5s ease, stroke-width 0.5s ease; }
.ring[data-ring="1"].filled{ stroke: var(--red); }
.ring[data-ring="2"].filled{ stroke: var(--gold); }
.ring[data-ring="3"].filled{ stroke: var(--green); }
.ring[data-ring="4"].filled{ stroke: var(--red-soft); }
.ring[data-ring="5"].filled{ stroke: var(--ink); }
.ring[data-ring="6"].filled{ stroke: var(--red); }
.ring[data-ring="7"].filled{ stroke: var(--gold); }
.ring[data-ring="8"].filled{ stroke: var(--green); }
.ring[data-ring="9"].filled{ stroke: var(--red-soft); }
.ring[data-ring="10"].filled{ stroke: var(--ink); }
.ring.filled{ stroke-width: 5; }
.rings-num{ font-family:"IBM Plex Mono", monospace; font-size: 15px; font-weight: 600; fill: var(--ink); }
.screen{ display:none; width:100%; text-align:center; animation: rise 0.45s ease; }
.screen[data-active="true"]{ display:block; }
@keyframes rise{ from{ opacity:0; transform: translateY(10px); } to{ opacity:1; transform: translateY(0); } }
.eyebrow{ font-family:"IBM Plex Mono", monospace; font-size: 13px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--red); margin: 0 0 6px; }
.title{ font-family:"Caveat", cursive; font-weight:700; font-size: clamp(2.4rem, 8vw, 3.4rem); line-height: 1.05; margin: 0 0 14px; color: var(--ink); }
.lede{ font-size: 1.05rem; line-height: 1.55; color: var(--ink-soft); max-width: 440px; margin: 0 auto 26px; }
.hint{ font-family:"IBM Plex Mono", monospace; font-size: 12.5px; color: var(--ink-soft); margin-top: 18px; }
#nickname-form{ display:flex; flex-direction:column; align-items:center; gap: 10px; background: var(--white); border: 1px solid var(--paper-line); border-radius: var(--radius); padding: 26px 24px; box-shadow: 0 10px 24px rgba(38,37,48,0.06); }
.field-label{ align-self:flex-start; font-family:"IBM Plex Mono", monospace; font-size: 12px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--ink-soft); }
#nickname{ width: 100%; font-family: "Source Serif 4", Georgia, serif; font-size: 1.15rem; padding: 12px 14px; border: 1.5px solid var(--paper-line); border-radius: 10px; background: var(--paper); color: var(--ink); outline: none; }
#nickname:focus{ border-color: var(--red); }
.btn-primary{ margin-top: 6px; width: 100%; font-family:"IBM Plex Mono", monospace; font-size: 14px; font-weight:600; letter-spacing: 0.03em; color: var(--white); background: var(--red); border: none; border-radius: 10px; padding: 13px 18px; cursor:pointer; transition: background 0.2s ease, transform 0.1s ease; }
.btn-primary:hover:not(:disabled){ background: #8E2B21; }
.btn-primary:active:not(:disabled){ transform: scale(0.98); }
.btn-primary:disabled{ background: var(--paper-line); color: var(--ink-soft); cursor: not-allowed; }
.quiz-head{ display:flex; justify-content: space-between; align-items: baseline; margin-bottom: 14px; font-family:"IBM Plex Mono", monospace; font-size: 12.5px; color: var(--ink-soft); }
.quiz-player{ color: var(--red); font-weight:600; }
.question{ font-family: "Source Serif 4", Georgia, serif; font-weight:600; font-size: 1.4rem; line-height: 1.4; margin: 0 0 22px; text-align:left; }
.options{ display:flex; flex-direction:column; gap: 10px; margin-bottom: 22px; }
.option{ text-align:left; font-family: "Source Serif 4", Georgia, serif; font-size: 1.02rem; background: var(--white); border: 1.5px solid var(--paper-line); border-radius: 12px; padding: 13px 16px; cursor:pointer; transition: border-color 0.15s ease, background 0.15s ease; }
.option:hover{ border-color: var(--gold); }
.option.selected{ border-color: var(--ink); background: #EFE9D8; }
.option.correct{ border-color: var(--green); background: #E7EFE6; }
.option.incorrect{ border-color: var(--red); background: #F6E6E3; }
.option[disabled]{ cursor: default; }
.review{ text-align:left; border-top: 1px solid var(--paper-line); margin-top: 8px; padding-top: 16px; }
.review-item{ display:flex; gap: 10px; padding: 10px 0; border-bottom: 1px dashed var(--paper-line); font-size: 0.95rem; }
.review-item:last-child{ border-bottom:none; }
.review-mark{ flex-shrink:0; font-family:"IBM Plex Mono", monospace; font-weight:600; }
.review-mark.ok{ color: var(--green); }
.review-mark.no{ color: var(--red); }
@media (max-width: 400px){ .rings{ width: 104px; height: 104px; } .title{ font-size: 2.1rem; } }