:root {
  /* 혼례의 청홍. 청은 바탕과 선택, 홍은 봉투 인쇄와 포커스에만 쓴다. */
  --cheong: #17305c;
  --hong: #b8233a;
  --paper: #fdfdfb;
  --flap: #f3f3ee;
  --ground: #f1f3f6;
  --ink: #141d2b;
  --muted: #566072;
  --line: #c6cedb;

  --space-inner: 8px;
  --space-item: 16px;
  --space-group: 32px;

  --batang: "Gowun Batang", "Noto Serif KR", "AppleMyungjo", serif;
  --dodum: "Gowun Dodum", "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font: 16px/1.6 var(--dodum);
  word-break: keep-all;
  -webkit-text-size-adjust: 100%;
}

/* 봉투 */
.hero {
  position: sticky;
  top: 0;
  z-index: 1;
  padding: 12px var(--space-item) var(--space-item);
  background: var(--cheong);
  overflow: hidden;
}

.brand {
  margin: 0 0 10px;
  color: #fff;
  font: 700 18px/1.3 var(--batang);
}

.envelope {
  position: relative;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-item);
  min-height: 176px;
  padding: 18px 16px 16px 20px;
  background: var(--paper);
  border-radius: 2px;
  box-shadow:
    0 1px 1px hsl(217 60% 8% / 0.3),
    0 6px 12px hsl(217 60% 8% / 0.28),
    0 18px 36px hsl(217 60% 8% / 0.32);
}

/* 덮개가 접힌 자국 */
.envelope::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 38%;
  background: var(--flap);
  clip-path: polygon(0 0, 100% 0, 50% 100%);
}

.note, .seal { position: relative; }
.note { min-width: 0; }
.note p { margin: 0; }

.amount {
  color: var(--ink);
  font: 700 clamp(46px, 14.5vw, 64px)/1.1 var(--batang);
  letter-spacing: -0.01em;
}
.amount-empty { font-size: clamp(32px, 9.5vw, 42px); }
.amount-stamp { animation: stamp 220ms ease-out; }

@keyframes stamp {
  from { transform: scale(1.05); opacity: 0.55; }
  to { transform: none; opacity: 1; }
}

.formal {
  margin-top: 6px !important;
  color: var(--muted);
  font: 400 15px/1.45 var(--batang);
}

.range {
  display: flex;
  gap: var(--space-item);
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.4;
}
.range div { display: flex; gap: 5px; }
.range dt { color: var(--muted); }
.range dd { margin: 0; color: var(--ink); font-weight: 700; }

.seal {
  flex: none;
  padding: 12px 6px;
  border: 1.5px solid var(--hong);
  color: var(--hong);
  font: 700 clamp(22px, 6.6vw, 30px)/1 "Noto Serif KR", var(--batang);
  letter-spacing: 0.14em;
  writing-mode: vertical-rl;
}

/* 질문 */
.questions { padding: var(--space-group) var(--space-item) 0; }

fieldset {
  margin: 0 0 var(--space-group);
  padding: 0;
  border: 0;
  min-width: 0;
}

legend {
  margin-bottom: var(--space-item);
  padding: 0;
  font: 700 19px/1.35 var(--batang);
}

.group + .group { margin-top: var(--space-item); }

.group-name {
  margin: 0 0 var(--space-inner);
  color: var(--muted);
  font-size: 14px;
}

.chips { display: flex; flex-wrap: wrap; gap: var(--space-inner); }

/* 폭을 같게 맞춘다. 한 줄에 둘씩, 넓은 화면에서는 넷까지 */
.chip { position: relative; flex: 1 1 40%; cursor: pointer; }
.chips-short .chip { flex-basis: 0; }

.chip input {
  position: absolute;
  inset: 0;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.chip span {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 6px 14px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 6px;
  text-align: center;
}

.chip input:checked + span {
  background: var(--cheong);
  border-color: var(--cheong);
  color: #fff;
}

.chip input:focus-visible + span,
.received input:focus-visible,
a:focus-visible {
  outline: 3px solid var(--hong);
  outline-offset: 2px;
}

.received {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-inner);
  margin-top: var(--space-item);
}

.received input {
  width: 6em;
  min-height: 48px;
  padding: 0 12px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: inherit;
  font: inherit;
  text-align: right;
}

.hint {
  flex-basis: 100%;
  margin: 0;
  color: var(--hong);
  font-size: 14px;
}

/* 근거 */
.why, .notes { padding: 0 var(--space-item); }

.why h2 {
  margin: 0 0 var(--space-item);
  font: 700 19px/1.35 var(--batang);
}

.why ul { margin: 0; padding: 0; list-style: none; }
.why li { max-width: 36em; }
.why li + li { margin-top: var(--space-item); }

.sources { display: block; margin-top: 2px; font-size: 14px; }
.sources a + a { margin-left: 10px; }

a { color: var(--cheong); text-underline-offset: 2px; }

.notes {
  margin-top: var(--space-group);
  padding-bottom: var(--space-group);
  color: var(--muted);
  font-size: 14px;
}
.notes p { max-width: 38em; margin: 0 0 var(--space-inner); }

/* 키보드로 옮겨 간 선택지가 붙어 있는 봉투에 가리지 않게 한다 */
@media (max-width: 959px) {
  html { scroll-padding-top: 260px; }
}

/* 낮은 화면에서는 봉투가 질문을 가리지 않게 붙이지 않는다 */
@media (max-height: 560px) and (max-width: 959px) {
  html { scroll-padding-top: 0; }
  .hero { position: static; }
}

/* 넓은 화면: 왼쪽에 봉투, 오른쪽에 질문과 근거 */
@media (min-width: 960px) {
  .page {
    display: grid;
    grid-template-columns: minmax(420px, 44%) minmax(0, 1fr);
    grid-auto-rows: min-content;
    min-height: 100vh;
  }
  .calc { display: contents; }

  .hero {
    grid-column: 1;
    grid-row: 1 / span 3;
    display: flex;
    flex-direction: column;
    justify-content: center;
    height: 100vh;
    padding: 40px clamp(32px, 5vw, 72px);
  }
  .brand {
    position: absolute;
    top: 32px;
    left: clamp(32px, 5vw, 72px);
    font-size: 22px;
  }
  .envelope {
    width: 100%;
    max-width: 480px;
    min-height: 272px;
    margin-inline: auto;
    padding: 32px 28px 28px 36px;
  }
  .amount { font-size: 76px; }
  .amount-empty { font-size: 46px; }
  .formal { font-size: 17px; }
  .range { font-size: 15px; }
  .seal { padding: 16px 8px; font-size: 36px; }

  .questions, .why, .notes {
    grid-column: 2;
    width: 100%;
    max-width: 620px;
    padding-inline: clamp(32px, 5vw, 64px);
  }
  .questions { padding-top: 56px; }
  .chip { flex-basis: 22%; }
}

@media (prefers-reduced-motion: reduce) {
  .amount-stamp { animation: none; }
}