/* =========================================================
   토큰
   Concept: 오래된 한국 만세력(달력책) + 서류에 찍는 붉은 도장
   ========================================================= */
:root {
  --ink: #1B2A4A;         /* 짙은 남색 - 표지/헤더 */
  --ink-soft: #35476b;
  --paper: #F4EFDE;       /* 낡은 종이색 - 카드 배경 */
  --paper-deep: #E9E0C7;  /* 카드 내부 패널 */
  --line: rgba(27, 42, 74, 0.16);
  --seal: #B23B3B;        /* 도장 붉은색 */
  --seal-deep: #8f2c2c;
  --gold: #A9832E;        /* 금박/장식 */
  --muted: #6b6252;
  --text: #22242b;

  --font-display: 'Noto Serif KR', serif;
  --font-body: 'Noto Sans KR', sans-serif;

  --radius-sm: 4px;
  --shadow-card: 0 18px 40px -18px rgba(27, 42, 74, 0.35);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text);
  background:
    radial-gradient(circle at 15% -10%, #24365c 0%, transparent 55%),
    radial-gradient(circle at 100% 0%, #2c4066 0%, transparent 40%),
    var(--ink);
  min-height: 100vh;
  line-height: 1.55;
}

.page {
  max-width: 620px;
  margin: 0 auto;
  padding: 48px 20px 40px;
}

/* ---------- 헤더 ---------- */
.site-header {
  text-align: center;
  color: #F4EFDE;
  margin-bottom: 28px;
}

.eyebrow {
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: #C9BFA0;
  margin: 0 0 10px;
  text-transform: none;
}

.site-header h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 40px;
  margin: 0 0 10px;
  letter-spacing: -0.01em;
}

.h1-sub {
  display: block;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 14px;
  color: #C9BFA0;
  letter-spacing: 0.02em;
  margin-top: 6px;
}

.lede {
  margin: 0;
  color: #D8CFB3;
  font-size: 15px;
}

/* ---------- 탭 (책 갈피처럼 카드 위로 튀어나오는 형태) ---------- */
.tabs {
  display: flex;
  gap: 6px;
  padding: 0 10px;
  position: relative;
  z-index: 1;
}

.tab {
  flex: 1;
  appearance: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 15px;
  color: #C9BFA0;
  background: #2c3e63;
  padding: 14px 10px 18px;
  border-radius: 10px 10px 0 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.tab-num {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--gold);
  font-size: 14px;
}

.tab:hover { color: #F4EFDE; }

.tab.is-active {
  background: var(--paper);
  color: var(--ink);
  transform: translateY(0);
}

.tab.is-active .tab-num { color: var(--seal); }

.tab:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

/* ---------- 카드(booklet) ---------- */
.booklet {
  background: var(--paper);
  border-radius: 0 10px 14px 14px;
  box-shadow: var(--shadow-card);
  border: 1px solid rgba(27, 42, 74, 0.08);
  padding: 34px 30px 26px;
  position: relative;
}

.booklet::before {
  /* 종이 질감을 흉내내는 미세한 노이즈 */
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background-image: radial-gradient(rgba(27,42,74,0.05) 1px, transparent 1px);
  background-size: 3px 3px;
  opacity: 0.35;
  pointer-events: none;
}

.panel { position: relative; }

.panel-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--ink);
  margin: 0 0 6px;
}

.panel-desc {
  font-size: 13.5px;
  color: var(--muted);
  margin: 0 0 20px;
  line-height: 1.6;
}

/* ---------- 폼 ---------- */
.calc-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 8px;
}

.person-inputs {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.02em;
}

/* 년/월/일 분리 입력 */
.date-group {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 10px;
}

.date-part {
  display: flex;
  flex-direction: column;
  gap: 6px;
  border: 1.5px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 9px 12px 10px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.date-part label {
  font-size: 11.5px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 0.04em;
}

.date-part:focus-within {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(169, 131, 46, 0.15);
}

.date-part input[type="number"] {
  border: none;
  background: transparent;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--text);
  padding: 2px 0 0;
  width: 100%;
  min-width: 0;
  appearance: none;
  -webkit-appearance: none;
}

.date-part input[type="number"]::placeholder {
  font-family: var(--font-body);
  font-weight: 400;
  color: #b7ad93;
}

.date-part input[type="number"]:focus {
  outline: none;
}

/* 숫자 입력 스피너 제거 */
.date-part input[type="number"]::-webkit-outer-spin-button,
.date-part input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.date-part input[type="number"] { -moz-appearance: textfield; }

.field-error {
  margin: 8px 2px 0;
  font-size: 12.5px;
  color: var(--seal);
  font-weight: 700;
}

.btn-seal {
  appearance: none;
  border: none;
  cursor: pointer;
  background: var(--seal);
  color: #fdf3ec;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 15px;
  padding: 13px 20px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.02em;
  transition: background 0.15s ease, transform 0.1s ease;
}

.btn-seal:hover { background: var(--seal-deep); }
.btn-seal:active { transform: translateY(1px); }
.btn-seal:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; }

/* ---------- 결과 ---------- */
.result {
  margin-top: 22px;
  padding-top: 22px;
  border-top: 1px dashed var(--line);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

/* 도장(스탬프) 시각 요소 */
.stamp {
  width: 130px;
  height: 130px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: stamp-down 0.35s cubic-bezier(.2,1.4,.4,1) forwards;
  transform: rotate(-6deg);
}

@keyframes stamp-down {
  0% { transform: rotate(-6deg) scale(1.9); opacity: 0; }
  60% { opacity: 1; }
  100% { transform: rotate(-6deg) scale(1); opacity: 1; }
}

.stamp-ring circle {
  fill: none;
  stroke: var(--seal);
  stroke-width: 4;
}

.stamp-ring {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.stamp-age {
  display: flex;
  flex-direction: column;
  align-items: center;
  color: var(--seal);
  font-family: var(--font-display);
}

.stamp-num {
  font-size: 38px;
  font-weight: 900;
  line-height: 1;
}

.stamp-unit {
  font-size: 13px;
  font-weight: 700;
  margin-top: 4px;
  letter-spacing: 0.05em;
}

.stamp-diff { width: 150px; height: 150px; }
.stamp-diff .stamp-num { font-size: 30px; }

/* 상세 목록 */
.detail-list {
  width: 100%;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: #fbf8ee;
}

.detail-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 12px 16px;
}

.detail-row:not(:last-child) { border-bottom: 1px solid var(--line); }

.detail-row dt {
  font-size: 14px;
  color: var(--muted);
  font-weight: 700;
}

.detail-row dt .hint {
  font-weight: 400;
  font-size: 12px;
}

.detail-row dd {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--ink);
}

.detail-list-compact .detail-row { padding: 9px 14px; }
.detail-list-compact dd { font-size: 15px; }

/* 나이차이 탭: 두 사람 카드 */
.diff-people {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 10px;
  align-items: center;
  width: 100%;
}

.person-card {
  background: var(--paper-deep);
  border-radius: var(--radius-sm);
  padding: 12px;
}

.person-title {
  margin: 0 0 8px;
  font-size: 12px;
  font-weight: 700;
  color: var(--gold);
  text-align: center;
  letter-spacing: 0.06em;
}

.diff-ribbon {
  font-family: var(--font-display);
  font-weight: 700;
  color: #fff;
  background: var(--ink);
  padding: 6px 4px;
  border-radius: 999px;
  font-size: 12px;
  writing-mode: horizontal-tb;
  text-align: center;
  min-width: 42px;
}

.diff-footnote {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
  text-align: center;
}

/* ---------- 광고 슬롯 ---------- */
.ad-slot {
  margin-top: 26px;
  padding-top: 18px;
  border-top: 1px dashed var(--line);
  text-align: center;
}

.ad-slot-label {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
  text-transform: uppercase;
}

/* ---------- 푸터 ---------- */
.site-footer {
  margin-top: 26px;
  text-align: center;
  color: #B9AF8F;
  font-size: 12.5px;
  line-height: 1.7;
}

.footer-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 13px;
  color: #D8CFB3;
  margin: 0 0 8px;
  letter-spacing: 0.02em;
}

.site-footer p {
  margin: 4px 0;
  word-break: keep-all;
  overflow-wrap: break-word;
}

/* ---------- 유틸 ---------- */
[hidden] { display: none !important; }

/* ---------- 반응형 ---------- */
@media (max-width: 480px) {
  .site-header h1 { font-size: 32px; }
  .booklet { padding: 26px 18px 20px; }
  .person-inputs { grid-template-columns: 1fr; }
  .diff-people { grid-template-columns: 1fr; }
  .diff-ribbon { writing-mode: horizontal-tb; margin: 0 auto; }
}

/* ---------- 접근성: 모션 최소화 ---------- */
@media (prefers-reduced-motion: reduce) {
  .stamp { animation: none; }
}