:root {
  --paper: #f6f8f5;
  --sheet: #ffffff;
  --ink: #1f2d2a;
  --muted: #56655f;
  --grid: #9cc2a8;
  --grid-soft: #dbe9df;
  --mark: #ffe14a;
  --chalk: #2f5d50;
  --serif: "Gowun Batang", "Nanum Myeongjo", serif;
  --sans: "IBM Plex Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  --hand: "Nanum Pen Script", cursive;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 17px/1.75 var(--sans); word-break: keep-all; overflow-wrap: break-word; }
a { color: var(--chalk); text-underline-offset: 3px; }
a:focus-visible, button:focus-visible { outline: 3px solid var(--chalk); outline-offset: 3px; border-radius: 4px; }
img { max-width: 100%; height: auto; display: block; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 720px; }

/* 머리 */
.top { border-bottom: 1px solid var(--grid-soft); background: var(--paper); }
.top .wrap { display: flex; align-items: center; gap: 28px; min-height: 64px; flex-wrap: wrap; }
.brand { font: 700 21px/1 var(--serif); color: var(--ink); text-decoration: none; letter-spacing: -.01em; }
.brand b { display: inline-block; background: var(--mark); padding: 2px 6px 3px; margin-right: 1px; }
.top nav { display: flex; gap: 22px; margin-left: auto; font-size: 15px; }
.top nav a { color: var(--ink); text-decoration: none; }
.top nav a:hover, .top nav a[aria-current] { text-decoration: underline; }

/* 제목 */
h1, h2, h3 { font-family: var(--serif); font-weight: 700; letter-spacing: -.02em; }
h1 { font-size: clamp(34px, 5.6vw, 58px); line-height: 1.22; margin: 0 0 20px; }
h2 { font-size: clamp(26px, 3.4vw, 34px); line-height: 1.3; margin: 0 0 18px; }
h3 { font-size: 21px; line-height: 1.4; margin: 0 0 8px; }
.lead { font-size: clamp(18px, 2vw, 20px); color: var(--muted); max-width: 640px; margin: 0; }
section { padding: 72px 0; }
section + section { border-top: 1px solid var(--grid-soft); }

/* 원고지 */
.hero { padding: 72px 0 64px; }
.sheet { margin-top: 48px; background: var(--sheet); border: 2px solid var(--grid); padding: 18px; }
.sheet-row { display: grid; grid-template-columns: repeat(auto-fill, var(--cell, 44px)); justify-content: center;
  height: calc(var(--cell, 44px) * var(--rows, 3)); overflow: hidden; padding: 1px; }
.c { width: var(--cell, 44px); height: var(--cell, 44px); box-shadow: 0 0 0 .5px var(--grid);
  display: grid; place-items: center; font: 400 calc(var(--cell, 44px) * .78)/1 var(--hand); color: #2b3a6b; }
.c.p { background: var(--mark); font: 500 calc(var(--cell, 44px) * .46)/1 var(--sans); color: var(--ink); }
.sheet-note { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 14px; font-size: 14px; color: var(--muted); }
.sheet-note span::before { content: ""; display: inline-block; width: 14px; height: 14px; margin-right: 6px; vertical-align: -2px; border: 1px solid var(--grid); }
.sheet-note .k-hand::before { background: var(--sheet); }
.sheet-note .k-paste::before { background: var(--mark); }
@media (max-width: 760px) { .sheet { padding: 10px; } .sheet-row { --cell: 30px; --rows: 7; } .c { --cell: 30px; } }
@media (max-width: 360px) { .sheet-row { --rows: 8; } }

/* 도구 목록 */
.tool { display: grid; grid-template-columns: 1fr 1.15fr; gap: 40px; align-items: center; }
.status { display: inline-block; font-size: 14px; font-weight: 600; color: var(--chalk); border: 1px solid var(--chalk); padding: 1px 10px; border-radius: 999px; margin-bottom: 14px; }
.tool img { border: 1px solid var(--grid-soft); box-shadow: 0 1px 0 var(--grid-soft); }
.button { display: inline-block; background: var(--ink); color: #fff; text-decoration: none; font-weight: 600; padding: 12px 22px; border-radius: 6px; }
.button:hover { background: var(--chalk); }
.button.line { background: transparent; color: var(--ink); border: 1.5px solid var(--ink); }
.button.line:hover { background: var(--grid-soft); }
.actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
@media (max-width: 860px) { .tool { grid-template-columns: 1fr; } }

/* 원칙 */
.principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 36px; margin-top: 12px; }
.principles p { margin: 0; color: var(--muted); }
@media (max-width: 860px) { .principles { grid-template-columns: 1fr; gap: 24px; } }

/* 제품 페이지 */
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px 40px; margin: 8px 0 0; padding: 0; list-style: none; }
.feature-list li { border-top: 2px solid var(--ink); padding-top: 14px; }
.feature-list p { margin: 0; color: var(--muted); }
@media (max-width: 760px) { .feature-list { grid-template-columns: 1fr; } }
.steps { counter-reset: s; list-style: none; padding: 0; margin: 0; display: grid; gap: 28px; }
.steps li { counter-increment: s; display: grid; grid-template-columns: 56px 1fr; gap: 18px; align-items: start; }
.steps li::before { content: counter(s); font: 700 34px/1 var(--serif); color: var(--chalk); border-bottom: 3px solid var(--mark); padding-bottom: 6px; text-align: center; }
.steps p { margin: 4px 0 0; color: var(--muted); }
.shot { margin: 40px 0 0; }
figure { margin: 0; }
.shot figcaption { font-size: 14px; color: var(--muted); margin-top: 8px; }
.shots2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 760px) { .shots2 { grid-template-columns: 1fr; } }
table.data { width: 100%; border-collapse: collapse; font-size: 15px; }
table.data th, table.data td { text-align: left; vertical-align: top; padding: 12px 14px; border-bottom: 1px solid var(--grid-soft); }
table.data th { font-weight: 600; background: #eef4ef; }
table.data td:first-child { font-weight: 600; white-space: nowrap; }
@media (max-width: 640px) { table.data td:first-child { white-space: normal; } }
.note { border-left: 4px solid var(--mark); background: var(--sheet); padding: 16px 20px; margin: 24px 0 0; }
.en { font-size: 16px; }
.en h2 { font-family: var(--sans); font-size: 24px; letter-spacing: 0; }

/* 문서(방침) */
.doc h1 { font-size: clamp(30px, 4vw, 40px); }
.doc h2 { font-size: 22px; margin: 40px 0 10px; }
.doc ul { padding-left: 22px; }
.doc li { margin: 6px 0; }
.meta { color: var(--muted); font-size: 15px; }

/* 꼬리 */
.foot { border-top: 1px solid var(--grid-soft); padding: 36px 0 48px; font-size: 14px; color: var(--muted); }
.foot .wrap { display: flex; gap: 24px; flex-wrap: wrap; justify-content: space-between; }
.foot a { color: var(--muted); }
@media (prefers-reduced-motion: no-preference) {
  .c.p { animation: mark .6s ease-out both; animation-delay: calc(var(--i) * 25ms + 400ms); }
  @keyframes mark { from { background: var(--sheet); } to { background: var(--mark); } }
}

/* 공유 */
.share { background: var(--sheet); }
.share h2 { font-size: clamp(22px, 2.6vw, 28px); margin-bottom: 8px; }
.share-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.share-btn { display: inline-flex; align-items: center; gap: 8px; font: 500 15px/1 var(--sans); color: var(--ink);
  background: var(--paper); border: 1px solid var(--grid); border-radius: 999px; padding: 10px 16px 10px 12px; cursor: pointer; }
.share-btn i { width: 12px; height: 12px; border-radius: 50%; background: var(--brand); box-shadow: 0 0 0 1px rgba(0,0,0,.08); }
.share-btn:hover { border-color: var(--ink); }
.share-msg { min-height: 1.6em; margin: 12px 0 0; font-size: 15px; color: var(--chalk); }