/* 이름 궁합 공책 — 학교 책상 위 초록 모눈 깍두기 공책, 연필 흑연 + 파란 색연필 + 인주 도장 */
:root {
  --desk: #cdb48a;
  --desk-d: #b89b6d;
  --desk-ink: #3b2f1e;
  --paper: #fcfdf8;
  --paper-2: #f2f4ec;
  --grid: #8cc4a0;
  --grid-d: #4f9a70;
  --lead: #3a3c43;
  --lead-2: rgba(58, 60, 67, .62);
  --blue: #2b5cb3;
  --blue-d: #1f468c;
  --ink: #d2342b;
  --pen: "Nanum Pen Script", "Gaegu", cursive;
  --hand: "Gaegu", "Nanum Pen Script", cursive;
  --body: "Gowun Dodum", system-ui, -apple-system, sans-serif;
  --ring-h: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='30' height='40'><circle cx='15' cy='29' r='4.6' fill='%237a6544'/><circle cx='15' cy='29' r='4.6' fill='none' stroke='%23e2e3dc' stroke-width='1'/><path d='M12.5 30C7 20 8 3 15.5 2.5C22 2 23.5 15 17.5 29' fill='none' stroke='%23767b82' stroke-width='3.4' stroke-linecap='round'/><path d='M12 27C8.6 18 10 5 15.4 4.6' fill='none' stroke='%23eef0f2' stroke-width='1.1' stroke-linecap='round'/></svg>");
  --ring-v: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='56' height='28'><circle cx='9' cy='15' r='4.4' fill='%237a6544'/><circle cx='47' cy='15' r='4.4' fill='%237a6544'/><path d='M9 16C9 2 47 2 47 16' fill='none' stroke='%23767b82' stroke-width='3.4' stroke-linecap='round'/><path d='M12 9C18 3.6 38 3.6 44 9' fill='none' stroke='%23eef0f2' stroke-width='1.1' stroke-linecap='round'/></svg>");
  --safe-b: env(safe-area-inset-bottom, 0px);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scrollbar-width: thin; }
body {
  margin: 0; min-height: 100svh; overflow-x: hidden;
  color: var(--lead); font-family: var(--body); word-break: keep-all; overflow-wrap: anywhere;
  background-color: var(--desk);
  background-image:
    repeating-linear-gradient(91deg, rgba(120, 88, 44, .07) 0 2px, transparent 2px 9px, rgba(255, 240, 210, .06) 9px 11px, transparent 11px 23px),
    repeating-linear-gradient(90.6deg, transparent 0 70px, rgba(110, 80, 40, .08) 70px 72px, transparent 72px 160px);
  -webkit-tap-highlight-color: transparent;
}
button, input { font: inherit; color: inherit; }
:focus-visible { outline: 2.5px solid var(--blue); outline-offset: 2px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ── 위 막대 ───────────────────────────────────────────── */
.bar { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 10px 14px 4px; max-width: 1240px; margin: 0 auto; }
.logo {
  font: 700 19px/1 var(--hand); color: var(--paper); background: var(--desk-ink); text-decoration: none;
  padding: 6px 10px 5px; border-radius: 3px; letter-spacing: .02em;
}
.snd {
  display: inline-flex; align-items: center; gap: 6px; border: 0; background: transparent; cursor: pointer;
  font: 700 17px/1 var(--hand); color: var(--desk-ink); padding: 6px 4px;
}
.snd svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linejoin: round; stroke-linecap: round; }
.snd[aria-pressed="true"] .off, .snd[aria-pressed="false"] .on { display: none; }

/* ── 책상과 공책 ─────────────────────────────────────────── */
.desk { position: relative; padding: 18px 10px 40px; }
.book { position: relative; max-width: 560px; margin: 0 auto; display: flex; flex-direction: column; gap: 46px; }
.page {
  position: relative; background: var(--paper); border-radius: 2px;
  box-shadow: 0 1px 0 #e7e9df, 0 2px 0 #d7dacd, 0 3px 0 #eef0e7, 0 4px 0 #d3d6c9, 0 14px 26px -12px rgba(60, 40, 10, .55);
}
.page::after { /* 종이 결 */
  content: ""; position: absolute; inset: 0; pointer-events: none; border-radius: inherit; opacity: .5;
  background-image: radial-gradient(rgba(90, 100, 80, .06) 1px, transparent 1.2px); background-size: 5px 5px;
}
.rings { position: absolute; left: 10px; right: 10px; top: -12px; height: 40px; background: var(--ring-h) repeat-x center top / 30px 40px; z-index: 2; pointer-events: none; }
.page-in { position: relative; z-index: 1; padding: 34px 16px 22px; }
.page-b { display: none; }
body.has-b .page-b { display: block; }

.date { margin: 0 0 2px; text-align: right; font: 400 21px/1.2 var(--pen); color: var(--lead-2); }
.date .blank { display: inline-block; min-width: 1.6em; text-align: center; border-bottom: 1.5px solid rgba(58, 60, 67, .35); color: var(--lead); font-size: 24px; padding: 0 2px; }
.title {
  margin: 0 0 12px; font: 700 46px/1 var(--hand); letter-spacing: -.01em; color: var(--lead);
  display: inline-block; padding: 0 6px 4px 2px;
  background: linear-gradient(transparent 62%, rgba(140, 196, 160, .45) 62% 92%, transparent 92%);
}
.title-b { margin: 0 0 6px; font: 700 34px/1.1 var(--hand); color: var(--lead); }
.pair { margin: 0 0 10px; font: 400 30px/1 var(--pen); color: var(--lead); }

/* 이름 칸 */
.names { display: grid; grid-template-columns: 1fr auto 1fr; align-items: end; gap: 6px 8px; margin: 0 0 14px; }
.nm { display: block; min-width: 0; }
.nm input {
  display: block; width: 100%; min-width: 0; border: 0; border-radius: 0; background: transparent; padding: 4px 2px 2px;
  font: 400 38px/1.1 var(--pen); color: var(--lead); text-align: center;
  border-bottom: 2px solid rgba(58, 60, 67, .55);
}
#nameB { color: var(--blue); border-bottom-color: rgba(43, 92, 179, .6); }
.nm input::placeholder { color: rgba(58, 60, 67, .3); }
.nm input:focus { outline: none; background: linear-gradient(transparent 70%, rgba(243, 193, 47, .28) 70%); }
.heart { width: 30px; height: 28px; margin-bottom: 8px; fill: none; stroke: var(--ink); stroke-width: 2.4; stroke-linejoin: round; }

.pencil-btn {
  grid-column: 1 / -1; position: relative; display: block; width: 100%; height: 58px; margin-top: 10px;
  border: 0; padding: 0; background: transparent; cursor: pointer; transition: transform .12s;
  filter: drop-shadow(0 3px 0 rgba(70, 50, 20, .28));
}
.pb-svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.pb-tip { fill: #e8c697; } .pb-lead { fill: var(--lead); }
.pb-body { fill: #f3c12f; } .pb-facet { stroke: #d6a11a; stroke-width: 1.4; fill: none; }
.pb-band { fill: #b9bab3; } .pb-ridge { stroke: #8f908a; stroke-width: 1.4; }
.pb-eraser { fill: #ef98a3; }
.pb-label { position: relative; display: block; padding-left: 4%; font: 700 25px/58px var(--hand); color: #3b2c06; letter-spacing: .01em; }
.pencil-btn:hover { transform: translateX(-3px) rotate(-.4deg); }
.pencil-btn:active { transform: translateX(-8px); }
.pencil-btn:disabled { cursor: default; opacity: .7; transform: none; }

.rule { grid-column: 1 / -1; display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 6px; margin-top: 4px; }
.rule-t { font: 700 16px/1 var(--hand); color: var(--lead-2); }
.rl {
  border: 1.5px solid rgba(58, 60, 67, .35); background: transparent; cursor: pointer; padding: 5px 10px 4px;
  font: 700 16px/1.1 var(--hand); color: var(--lead-2);
  border-radius: 255px 14px 225px 14px / 14px 225px 14px 255px;
  min-height: 42px;
}
.rl small { font-weight: 700; font-size: 15px; opacity: .8; }
.rl[aria-checked="true"] { border-color: var(--lead); color: var(--lead); background: rgba(140, 196, 160, .25); }
.err { grid-column: 1 / -1; margin: 2px 0 0; min-height: 0; font: 700 17px/1.3 var(--hand); color: var(--ink); text-align: center; }
.err:empty { display: none; }

/* 모눈 칸 */
.sheet { position: relative; margin: 0 auto; cursor: pointer; }
.sheet .grid-cv { display: block; margin: 0 auto; }
.stamp-cv { position: absolute; left: 0; top: 0; pointer-events: none; opacity: 0; transform-origin: center; }
.stamp-cv.on { opacity: .93; }
.stamp-cv.slam { animation: slam .42s cubic-bezier(.2, .9, .3, 1.25) both; }
@keyframes slam {
  0% { opacity: 0; transform: scale(1.9) rotate(var(--rot, -12deg)); }
  55% { opacity: .95; transform: scale(.92) rotate(var(--rot, -12deg)); }
  100% { opacity: .93; transform: scale(1) rotate(var(--rot, -12deg)); }
}
.stamp-cv.on:not(.slam) { transform: rotate(var(--rot, -12deg)); }
.page.thud { animation: thud .26s ease-out; }
@keyframes thud { 0% { transform: translateY(0); } 30% { transform: translateY(3px) rotate(.15deg); } 60% { transform: translateY(-1px); } 100% { transform: none; } }
.sheet-tag { position: absolute; left: 12px; bottom: 8px; margin: 0; font: 400 20px/1 var(--pen); color: var(--lead-2); pointer-events: none; }
.sheet-tag:empty { display: none; }

.after { margin-top: 14px; }
.note { margin: 0 0 8px; font: 400 32px/1.15 var(--pen); color: var(--lead); text-align: center; text-wrap: balance; }
.note.write { animation: write 1.1s steps(18) both; }
@keyframes write { from { clip-path: inset(0 100% 0 0); } to { clip-path: inset(0 0 0 0); } }
.flip {
  display: block; margin: 0 auto 14px; border: 0; background: transparent; cursor: pointer; padding: 4px 6px;
  font: 400 25px/1.2 var(--pen); color: var(--blue); text-decoration: underline wavy rgba(43, 92, 179, .5); text-underline-offset: 6px;
}
.flip[hidden] { display: none; }
.acts { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.btn {
  appearance: none; cursor: pointer; padding: 10px 16px 8px; background: var(--paper); color: var(--lead);
  border: 2px solid var(--lead); font: 700 19px/1.1 var(--hand);
  border-radius: 255px 15px 225px 15px / 15px 225px 15px 255px;
  box-shadow: 2px 3px 0 rgba(58, 60, 67, .22);
}
.btn:active { transform: translate(1px, 2px); box-shadow: 1px 1px 0 rgba(58, 60, 67, .22); }
.btn.blue { background: var(--blue); border-color: var(--blue-d); color: #fff; }
.btn.quiet { border-style: dashed; box-shadow: none; }
.how { margin-top: 16px; font: 400 23px/1.25 var(--pen); color: var(--lead); }
.how summary { cursor: pointer; text-align: center; color: var(--lead-2); list-style-position: inside; }
.how-list { margin: 8px 0 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: 2px 14px; }
.how-list li { min-width: 0; }
.how-list .jm { font: 400 .78em/1 var(--body); margin-left: .1em; }
.how-list .n { margin-left: .22em; }
.how-list .ch { font-size: 28px; margin-right: 4px; }
.how-list .b { color: var(--blue); }
.how-list .eq { color: var(--lead); }
.how-list .mod { color: var(--lead-2); font-size: 19px; }
.sum { margin: 4px 0 0; text-align: center; font: 400 26px/1.3 var(--pen); color: var(--lead-2); }

/* 연필·지우개 소품 */
.pencil, .eraser { position: absolute; left: 0; top: 0; pointer-events: none; z-index: 20; opacity: 0; transition: opacity .25s; }
.pencil { width: 150px; height: 18px; transform-origin: 0 50%; filter: drop-shadow(2px 5px 3px rgba(50, 30, 0, .3)); }
.pencil.on, .eraser.on { opacity: 1; }
.eraser { width: 64px; height: 33px; filter: drop-shadow(2px 4px 3px rgba(50, 30, 0, .3)); }

/* ── 받은 쪽지 ─────────────────────────────────────────── */
.intro {
  position: fixed; inset: 0; z-index: 60; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px;
  padding: 24px 16px calc(24px + var(--safe-b)); text-align: center;
  background: rgba(70, 52, 26, .72); backdrop-filter: blur(3px); -webkit-backdrop-filter: blur(3px);
}
.intro[hidden] { display: none; }
.memo { position: relative; border: 0; background: transparent; padding: 0; cursor: pointer; width: min(300px, 78vw); animation: bob 2.4s ease-in-out infinite; }
@keyframes bob { 50% { transform: translateY(-6px) rotate(-1.5deg); } }
.memo-svg { width: 100%; display: block; filter: drop-shadow(0 12px 14px rgba(30, 20, 0, .4)); }
.m-back { fill: var(--paper); stroke: var(--grid-d); stroke-width: 1.2; }
.m-grid { fill: url(#none); }
.m-flap { fill: #eef1e6; stroke: var(--grid-d); stroke-width: 1.2; stroke-linejoin: round; transform-origin: 110px 18px; transition: transform .5s; }
.m-fold { fill: none; stroke: rgba(79, 154, 112, .45); stroke-width: 1.1; }
.memo-to { position: absolute; left: 0; right: 0; bottom: 18%; font: 400 34px/1 var(--pen); color: var(--lead); }
.memo-to b { color: var(--ink); font-weight: 400; margin: 0 .2em; }
.intro.open .m-flap { transform: scaleY(-1); }
.intro.open { animation: fade-out .5s .35s forwards; }
@keyframes fade-out { to { opacity: 0; visibility: hidden; } }
.intro-h { margin: 6px 0 0; font: 700 30px/1.2 var(--hand); color: #fff8ea; }
.intro-s { margin: 0 0 6px; font: 400 17px/1.4 var(--body); color: rgba(255, 248, 234, .85); }

.toast {
  position: fixed; left: 50%; bottom: calc(18px + var(--safe-b)); z-index: 70; transform: translate(-50%, 20px); opacity: 0;
  background: var(--lead); color: var(--paper); padding: 10px 16px; border-radius: 4px; font: 700 17px/1.3 var(--hand);
  transition: opacity .2s, transform .2s; pointer-events: none; max-width: calc(100vw - 32px); text-align: center;
}
.toast.on { opacity: 1; transform: translate(-50%, 0); }

/* ── 아래 설명 ─────────────────────────────────────────── */
.guide { position: relative; padding: 10px 10px 30px; content-visibility: auto; contain-intrinsic-size: auto 2200px; }
.guide-in {
  max-width: 720px; margin: 0 auto; background: var(--paper); padding: 28px 20px 24px 34px; border-radius: 2px;
  box-shadow: 0 14px 26px -14px rgba(60, 40, 10, .5);
  background-image: linear-gradient(90deg, transparent 22px, rgba(210, 52, 43, .35) 22px 23.5px, transparent 23.5px);
  font-size: 17px; line-height: 1.8; color: #34363c;
}
.guide h2 { font: 700 27px/1.25 var(--hand); letter-spacing: -.02em; text-wrap: balance; margin: 34px 0 10px; color: var(--lead); }
.guide h2:first-of-type { margin-top: 4px; }
.guide h3 { font: 700 23px/1.25 var(--hand); margin: 24px 0 6px; color: var(--lead); }
.guide p { margin: 0 0 12px; }
.guide a { color: var(--blue); text-underline-offset: 3px; }
.guide ol, .guide ul { padding-left: 1.3em; margin: 0 0 12px; }
.guide li { margin: 0 0 6px; }
.guide li b { margin-right: .35em; }
.guide .dim { color: #6b6d73; }
.ex li::marker { font-family: var(--hand); font-weight: 700; }
.tbl-wrap { display: flex; flex-wrap: wrap; gap: 14px 22px; margin: 4px 0 14px; }
.strokes { border-collapse: collapse; font-size: 18px; }
.strokes caption { text-align: left; font: 700 19px/1.4 var(--hand); padding-bottom: 4px; }
.strokes th, .strokes td { border: 1.5px solid var(--grid); padding: 4px 10px; text-align: left; }
.strokes th { font: 700 17px/1.3 var(--hand); background: rgba(140, 196, 160, .18); color: var(--lead); white-space: nowrap; }
.strokes td { letter-spacing: .25em; }
.faq dt { font-weight: 700; margin: 16px 0 4px; color: var(--lead); }
.faq dd { margin: 0; }
.others li { list-style: none; margin-left: -1.3em; }
.others a { font-weight: 700; margin-right: .4em; }
.credit { font-size: 14px; color: #6b6d73; margin-top: 18px; }
.site-foot { margin-top: 26px; padding-top: 14px; border-top: 1.5px dashed rgba(58, 60, 67, .25); font-size: 14px; color: #6b6d73; text-align: center; }
.site-foot a { color: inherit; }
.site-foot .sep { margin: 0 .6em; }
.fallback { text-align: center; font: 700 18px var(--hand); }

/* ── 큰 화면: 공책을 펼친 양면 ─────────────────────────────── */
@media (min-width: 940px) {
  .desk { padding: 14px 24px 50px; }
  .book { max-width: 1220px; flex-direction: row; align-items: stretch; gap: 0; }
  .page { flex: 1 1 0; min-width: 0; }
  .page-a { border-radius: 3px 0 0 3px; box-shadow: -1px 1px 0 #e7e9df, -2px 2px 0 #d7dacd, -3px 3px 0 #eef0e7, -4px 4px 0 #d3d6c9, 0 18px 30px -14px rgba(60, 40, 10, .55); }
  .page-b { display: block; border-radius: 0 3px 3px 0; margin-left: 40px; box-shadow: 1px 1px 0 #e7e9df, 2px 2px 0 #d7dacd, 3px 3px 0 #eef0e7, 4px 4px 0 #d3d6c9, 0 18px 30px -14px rgba(60, 40, 10, .55); }
  .page-a .rings { left: auto; right: -48px; top: 16px; bottom: 16px; width: 56px; height: auto; background: var(--ring-v) repeat-y center top / 56px 28px; }
  .page-b .rings { display: none; }
  .page-in { padding: 26px 34px 26px; }
  .page-a .page-in { padding-right: 30px; }
  .page-b .page-in { padding-left: 30px; }
  .flip { display: none; }
  .title { font-size: 50px; margin-bottom: 8px; }
  .page-a .date { position: absolute; right: 30px; top: 30px; }
  .title-b { margin-top: 2px; }
  .page-b .date { display: none; }
  .names { margin-bottom: 10px; }
  .pencil-btn { height: 52px; margin-top: 4px; }
  .pb-label { line-height: 52px; }
  .page-b:not(.ready) .page-in > :not(.date):not(.title-b) { visibility: hidden; }
  .page-b:not(.ready) .page-in::after {
    content: "왼쪽 계산이 끝나면 여기에 거꾸로 써요"; display: block; margin-top: 40px; text-align: center;
    font: 400 26px/1.3 var(--pen); color: rgba(58, 60, 67, .38);
  }
}
@media (min-width: 1500px) {
  .book { max-width: 1440px; }
  .bar { max-width: 1480px; padding-left: 24px; padding-right: 24px; }
  .title { font-size: 64px; }
}

@media (prefers-reduced-motion: reduce) {
  .memo, .stamp-cv.slam, .page.thud, .note.write { animation: none !important; }
  .pencil-btn { transition: none; }
}