/* 오렌지북 — 종이 노래방책.
   크림색 종이 + 먹색 잉크 + 앱 아이콘의 주황 하나. 번호는 항상 고정폭 숫자. */

:root {
  --paper: #f7efdf;
  --paper-2: #efe3cb;
  --ink: #2a1b12;
  --soft: #6e5748;
  --orange: #ff8a4f;
  --deep: #b93f14;      /* 종이 위 글자용 진한 주황 (대비 4.5:1 이상) */
  --line: rgba(42, 27, 18, .3);
  --shadow: rgba(42, 27, 18, .9);

  --serif: "AppleMyungjo", "Nanum Myeongjo", "Noto Serif KR", "Batang", serif;
  --sans: "Apple SD Gothic Neo", "Pretendard", "Noto Sans KR", "Malgun Gothic", system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1b1310;
    --paper-2: #271b16;
    --ink: #f3e8d6;
    --soft: #b9a690;
    --deep: #ff9a68;
    --line: rgba(243, 232, 214, .28);
    --shadow: rgba(255, 138, 79, .85);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.75 var(--sans);
  word-break: keep-all;          /* 한글은 어절 단위로 줄바꿈 */
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; }
main { min-width: 0; }
a { color: var(--deep); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--orange); outline-offset: 3px; border-radius: 2px; }
b { font-weight: 700; }
code { font: 600 .88em var(--mono); background: var(--paper-2); padding: .12em .45em; border-radius: 4px; }

/* ── 책 한 장 ───────────────────────────────── */
.sheet {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 clamp(18px, 5vw, 56px);
}
@media (min-width: 1000px) {
  /* 왼쪽 제본 구멍 */
  body::before {
    content: "";
    position: fixed; inset: 0 auto 0 0; width: 54px;
    border-right: 1px solid var(--line);
    background:
      radial-gradient(circle at 27px 50%, var(--paper-2) 0 8px, transparent 9px) 0 0 / 54px 132px repeat-y;
    pointer-events: none;
  }
}

/* ── 머리말 ───────────────────────────────── */
.top {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px 16px;
  padding: 22px 0 18px;
  border-bottom: 2px solid var(--ink);
}
.brand { display: flex; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; }
.brand img { border-radius: 9px; display: block; }
.brand-name { font: 800 22px/1 var(--serif); letter-spacing: -.02em; }
.brand-en { font: 600 11px/1 var(--mono); letter-spacing: .18em; color: var(--soft); padding-top: 3px; }
.top nav { display: flex; gap: 4px; }
.top nav a {
  color: var(--ink); text-decoration: none;
  font: 600 14px/1 var(--sans);
  padding: 10px 12px; border-radius: 999px;
}
.top nav a:hover { background: var(--paper-2); }
.top nav a[aria-current="page"] { background: var(--ink); color: var(--paper); }
@media (max-width: 560px) { .brand-en { display: none; } }
@media (max-width: 360px) { .top nav { margin-left: -12px; } }

/* ── 표지 ───────────────────────────────── */
.cover {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: center;
  padding: clamp(44px, 8vw, 96px) 0 clamp(48px, 7vw, 88px);
}
.eyebrow {
  margin: 0 0 18px;
  font: 700 12px/1.2 var(--mono); letter-spacing: .16em; text-transform: uppercase;
  color: var(--deep);
}
.cover h1 {
  margin: 0 0 26px;
  font: 800 clamp(38px, 6.4vw, 74px)/1.12 var(--serif);
  letter-spacing: -.04em;
  text-wrap: balance;
}
.hl {
  background: linear-gradient(transparent 56%, rgba(255, 138, 79, .62) 56% 90%, transparent 90%);
  padding: 0 .06em;
}
.lede { margin: 0 0 34px; max-width: 34em; font-size: 18px; color: var(--soft); }
.cta-row { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; margin: 0; }
.cta-meta { font: 500 13px/1.5 var(--sans); color: var(--soft); }

/* 도장처럼 찍히는 버튼 */
.stamp {
  display: inline-block;
  background: var(--orange); color: #2a1b12;
  font: 800 17px/1 var(--sans);
  letter-spacing: -.01em;
  padding: 17px 24px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  text-decoration: none;
  box-shadow: 5px 5px 0 var(--shadow);
  transition: transform .12s ease, box-shadow .12s ease;
}
.stamp:hover { transform: translate(2px, 2px); box-shadow: 3px 3px 0 var(--shadow); }
.stamp:active { transform: translate(5px, 5px); box-shadow: 0 0 0 var(--shadow); }
@media (prefers-color-scheme: dark) { .stamp { border-color: var(--orange); } }

/* 곡번호 색인 카드 */
.index-card {
  background: var(--paper-2);
  border: 2px solid var(--ink);
  border-radius: 4px;
  padding: 20px 22px 18px;
  transform: rotate(1.3deg);
  box-shadow: 8px 8px 0 var(--line);
}
.index-head {
  display: flex; justify-content: space-between;
  margin: 0 0 8px; padding-bottom: 10px;
  border-bottom: 2px solid var(--ink);
  font: 700 12px/1 var(--mono); letter-spacing: .14em; color: var(--deep);
}
.index-list { list-style: none; margin: 0; padding: 0; }
.index-list li {
  display: flex; align-items: baseline; gap: 8px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--line);
}
.index-list li:last-child { border-bottom: 0; }
.song { display: flex; flex-direction: column; min-width: 0; flex: 0 1 auto; line-height: 1.35; }
.song b { font: 700 16px/1.35 var(--sans); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.song small { font: 500 12px/1.4 var(--sans); color: var(--soft); }
.lead { flex: 1 1 14px; min-width: 14px; border-bottom: 2px dotted var(--line); transform: translateY(-4px); }
.nums { display: flex; flex-direction: column; align-items: flex-end; gap: 2px; font: 700 14px/1.3 var(--mono); font-variant-numeric: tabular-nums; flex: none; }
.nums .tj { color: var(--ink); }
.nums .ky { color: var(--deep); }
.index-foot { margin: 8px 0 0; font: 500 12px/1.5 var(--sans); color: var(--soft); }

@media (max-width: 860px) {
  .cover { grid-template-columns: minmax(0, 1fr); }
  .index-card { transform: rotate(.6deg); max-width: 460px; }
}

/* ── 섹션 라벨 ───────────────────────────────── */
.sec-label {
  display: flex; align-items: center; gap: 14px;
  margin: 0 0 28px;
  font: 800 13px/1 var(--mono); letter-spacing: .2em; text-transform: uppercase;
}
.sec-label::after { content: ""; flex: 1; height: 2px; background: var(--ink); }
.sec-label span { color: var(--ink); }

/* ── 앱 화면 ───────────────────────────────── */
.plates-wrap { padding-bottom: clamp(56px, 8vw, 96px); }
.plates { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 22px; align-items: start; }
.plate { margin: 0; }
.plate:nth-child(even) { margin-top: 38px; }
.plate:nth-child(1) { transform: rotate(-1deg); }
.plate:nth-child(3) { transform: rotate(.8deg); }
.plate img {
  display: block; width: 100%;
  border: 2px solid var(--ink); border-radius: 14px;
  background: #111;
  box-shadow: 6px 6px 0 var(--line);
}
.plate figcaption { margin-top: 14px; font: 600 13px/1 var(--sans); color: var(--soft); }
.plate figcaption b { font: 800 12px/1 var(--mono); color: var(--deep); margin-right: 8px; letter-spacing: .06em; }
@media (max-width: 820px) {
  .plates {
    display: flex; gap: 16px;
    overflow-x: auto; scroll-snap-type: x mandatory;
    padding: 4px 4px 22px; margin: 0 -4px;
  }
  .plate { flex: 0 0 64%; scroll-snap-align: start; }
  .plate:nth-child(even), .plate:nth-child(n) { margin-top: 0; transform: none; }
}

/* ── 목차 ───────────────────────────────── */
.toc { padding-bottom: clamp(56px, 8vw, 96px); }
.chapter {
  display: grid; grid-template-columns: clamp(64px, 11vw, 132px) minmax(0, 1fr);
  gap: clamp(8px, 2vw, 28px);
  padding: 30px 0;
  border-top: 1px solid var(--line);
}
.chapter:first-of-type { border-top: 0; padding-top: 0; }
.chap-no {
  margin: 0; font: 800 clamp(64px, 11vw, 132px)/.85 var(--serif);
  color: var(--orange);
  -webkit-text-stroke: 2px var(--ink);
  paint-order: stroke fill;
  letter-spacing: -.04em;
}
@media (prefers-color-scheme: dark) { .chap-no { -webkit-text-stroke: 0; } }
.chap-body h3 {
  display: flex; align-items: baseline; gap: 10px;
  margin: 0 0 14px;
  font: 800 clamp(22px, 3.2vw, 30px)/1.3 var(--serif);
  letter-spacing: -.02em;
}
.chap-body h3 em { font: 600 13px/1 var(--mono); font-style: normal; color: var(--soft); }
.chap-body ul { margin: 0; padding: 0; list-style: none; }
.chap-body li { position: relative; padding: 5px 0 5px 22px; max-width: 40em; }
.chap-body li::before {
  content: ""; position: absolute; left: 2px; top: 1.05em;
  width: 8px; height: 8px; border-radius: 50%; background: var(--orange); border: 1.5px solid var(--ink);
}
@media (prefers-color-scheme: dark) { .chap-body li::before { border-color: var(--orange); } }
.chap-body li b { background: linear-gradient(transparent 62%, rgba(255, 138, 79, .4) 62%); }

/* ── 자주 묻는 것 ───────────────────────────────── */
.faq { padding-bottom: clamp(56px, 8vw, 96px); max-width: 760px; }
.faq details { border-bottom: 1px solid var(--line); }
.faq details:first-of-type { border-top: 1px solid var(--line); }
.faq summary {
  list-style: none; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 18px 2px; font: 700 18px/1.5 var(--sans);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font: 700 24px/1 var(--mono); color: var(--deep); transition: transform .15s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { margin: 0 0 20px; padding: 0 2px; color: var(--soft); }

/* ── 맺음 ───────────────────────────────── */
.closing {
  display: flex; align-items: center; justify-content: space-between; gap: 28px; flex-wrap: wrap;
  padding: clamp(36px, 6vw, 64px) clamp(22px, 4vw, 48px);
  margin-bottom: clamp(48px, 7vw, 88px);
  background: var(--orange); color: #2a1b12;
  border: 2px solid var(--ink); border-radius: 4px;
  box-shadow: 8px 8px 0 var(--line);
}
.closing-line { margin: 0; font: 800 clamp(26px, 4.4vw, 44px)/1.2 var(--serif); letter-spacing: -.03em; }
.closing .stamp { background: #2a1b12; color: #fff3e3; border-color: #2a1b12; box-shadow: 5px 5px 0 rgba(42, 27, 18, .35); }

/* ── 바닥글 ───────────────────────────────── */
.foot { border-top: 2px solid var(--ink); padding: 28px 0 56px; }
.foot-grid { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; align-items: flex-start; }
.foot-brand { margin: 0; display: flex; flex-direction: column; gap: 2px; }
.foot-brand strong { font: 800 20px/1.3 var(--serif); }
.foot-brand span { font: 500 13px/1.4 var(--sans); color: var(--soft); }
.foot-links { display: flex; gap: 6px 22px; flex-wrap: wrap; list-style: none; margin: 0; padding: 0; font: 600 14px/1.6 var(--sans); }
.foot-links a { color: var(--ink); }
.foot-note { margin: 16px 0 0; max-width: 62em; font: 400 12.5px/1.7 var(--sans); color: var(--soft); }

/* ── 약관·방침·지원 (책 본문) ───────────────────────────────── */
.doc { max-width: 760px; padding: clamp(36px, 6vw, 72px) 0 clamp(40px, 6vw, 72px); }
.doc-head { margin-bottom: 34px; }
.doc-head h1 { margin: 0 0 12px; font: 800 clamp(34px, 6vw, 56px)/1.15 var(--serif); letter-spacing: -.03em; }
.doc-meta { margin: 0; font: 500 14px/1.6 var(--sans); color: var(--soft); }
.doc-intro { margin: 0 0 8px; }
.doc-sum {
  margin: 0 0 36px; padding: 20px 24px 16px;
  background: var(--paper-2); border-left: 6px solid var(--orange); border-radius: 2px;
}
.doc-sum h2 { margin: 0 0 8px; font: 800 13px/1 var(--mono); letter-spacing: .18em; color: var(--deep); }
.doc-sum ul { margin: 0; padding-left: 1.2em; }
.doc-sum li { padding: 3px 0; }

.articles { list-style: none; margin: 0; padding: 0; }
.articles > li { padding: 28px 0; border-top: 1px solid var(--line); }
.articles h2 { margin: 0 0 12px; font: 800 clamp(19px, 2.6vw, 23px)/1.4 var(--serif); letter-spacing: -.02em; }
.articles h2 span { font: 700 13px/1 var(--mono); letter-spacing: .08em; color: var(--deep); margin-right: 10px; }
.articles p { margin: 0 0 12px; }
.articles ul { margin: 0 0 12px; padding-left: 1.2em; }
.articles li li, .articles ul li { padding: 2px 0; }
.articles > li { padding-left: 0; }

.spec { width: 100%; border-collapse: collapse; margin: 0 0 16px; font-size: 15px; line-height: 1.65; }
.spec th, .spec td { text-align: left; vertical-align: top; padding: 12px 14px; border: 1px solid var(--line); }
.spec thead th { background: var(--ink); color: var(--paper); font: 700 13px/1.4 var(--sans); border-color: var(--ink); }
.spec tbody th { width: 9em; background: var(--paper-2); font-weight: 700; }
@media (max-width: 560px) {
  .spec tbody th, .spec td { display: block; width: auto; border-bottom: 0; }
  .spec tbody tr { display: block; border-bottom: 1px solid var(--line); margin-bottom: 10px; }
  .spec thead { display: none; }
}

.contact { display: grid; grid-template-columns: 9em minmax(0, 1fr); gap: 6px 14px; margin: 0 0 14px; padding: 14px 18px; background: var(--paper-2); border-radius: 2px; }
.contact dt { font-weight: 700; color: var(--soft); }
.contact dd { margin: 0; }
@media (max-width: 480px) { .contact { grid-template-columns: 1fr; } .contact dd { margin-bottom: 8px; } }
.doc-end { margin: 24px 0 0; padding-top: 20px; border-top: 2px solid var(--ink); font: 600 14px/1.6 var(--sans); color: var(--soft); }

/* 지원 페이지 */
.support-contact { margin-bottom: 8px; padding: 26px 26px 20px; background: var(--orange); color: #2a1b12; border: 2px solid var(--ink); border-radius: 4px; box-shadow: 6px 6px 0 var(--line); }
.support-contact h2 { margin: 0 0 6px; font: 800 14px/1 var(--mono); letter-spacing: .18em; }
.support-contact a { color: #2a1b12; }
.big-mail { margin: 4px 0 8px; font: 800 clamp(20px, 4.4vw, 30px)/1.3 var(--serif); word-break: break-all; }
.tags { list-style: none; margin: 14px 0 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 8px 18px; font-size: 14.5px; }
.tags code { background: #2a1b12; color: #fff3e3; }
.support-block { padding: 30px 0 4px; border-top: 1px solid var(--line); margin-top: 30px; }
.support-contact + .support-block { margin-top: 36px; }
.support-block h2 { margin: 0 0 10px; font: 800 clamp(20px, 3vw, 26px)/1.35 var(--serif); letter-spacing: -.02em; }
.support-block p { margin: 0 0 12px; }
.support-block ul, .support-block ol { margin: 0 0 14px; padding-left: 1.3em; }
.support-block li { padding: 3px 0; }
.steps li::marker { font: 800 15px var(--mono); color: var(--deep); }
.support-block:target, .articles > li:target { animation: flash 1.6s ease-out; }
@keyframes flash { from { background: rgba(255, 138, 79, .35); } to { background: transparent; } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .stamp, .faq summary::after { transition: none; }
  .support-block:target, .articles > li:target { animation: none; }
}
@media print {
  body::before { display: none; }
  .top nav, .stamp, .closing { display: none; }
  .index-card, .plate img { box-shadow: none; }
}