/*
 * 달네스트 소개 사이트 — «영어 4선 노트»
 * 영어 공부 노트에 실제로 있는 것만 씁니다: 파란 줄, 빨간 펜(채점 표시 · 기준선), 형광펜(강조), 연습장 여백선.
 * 그라데이션 · 이모지 · 카드 격자 · 제목 위 아이콘 타일은 쓰지 않습니다.
 */
:root {
  --paper: #ffffff; --ink: #101a30; --muted: #4a566e; --soft: #f3f6fc;
  --rule: #cddbf3; --rule-strong: #8eaee2; --hl: #ffe45e; --red: #d63636; --ok: #1d7a4a; --bad: #b3261e;
  --card: var(--paper); --line: var(--rule); --blue: #1f4fa8; --radius: 3px;
  --sans: system-ui, -apple-system, "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", "Segoe UI", sans-serif;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, "Noto Serif", serif;
}
@media (prefers-color-scheme: dark) {
  :root { --paper: #0e1729; --ink: #eef2fb; --muted: #a9b5cd; --soft: #142039; --rule: #243759; --rule-strong: #46659c; --hl: rgba(255, 228, 94, .3); --red: #ff8080; --ok: #62d49b; --bad: #ff8a80; --blue: #8fb3f0; }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 17px/1.75 var(--sans); -webkit-text-size-adjust: 100%; text-rendering: optimizeLegibility; }
a { color: var(--blue); text-underline-offset: 3px; }
.wrap { width: min(1120px, 100% - 48px); margin-inline: auto; }
.en { font-family: var(--serif); }
mark.hl { background: linear-gradient(transparent 52%, var(--hl) 52% 92%, transparent 92%); color: inherit; padding: 0 .08em; background-repeat: no-repeat; }
/* 형광펜이 그어지는 움직임 — 움직임을 끈 사람 · 인쇄 · 미리보기에서는 처음부터 다 칠해져 있습니다 */
@media (prefers-reduced-motion: no-preference) {
  mark.hl { animation: hl .9s .25s ease-out backwards; }
  @keyframes hl { from { background-size: 0% 100%; } to { background-size: 100% 100%; } }
}

/* 머리글 */
.top { border-bottom: 1px solid var(--rule); background: var(--paper); position: sticky; top: 0; z-index: 10; }
.top .wrap { display: flex; align-items: center; gap: 28px; min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font: 700 22px/1 var(--serif); letter-spacing: .01em; }
.brand svg { width: 26px; height: 26px; flex: none; }
.brand small { font: 500 13px var(--sans); color: var(--muted); letter-spacing: 0; padding-left: 10px; margin-left: 2px; border-left: 1px solid var(--rule-strong); }
.top nav { margin-left: auto; display: flex; gap: 26px; align-items: center; }
.top nav a { color: var(--ink); text-decoration: none; font-size: 15px; padding: 6px 0; border-bottom: 2px solid transparent; }
.top nav a:hover { border-bottom-color: var(--rule-strong); }
.top nav a.cta { border: 1.5px solid var(--ink); border-radius: var(--radius); padding: 7px 16px; }
.top nav a.cta:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }

/* 첫 화면 — 왼쪽 글, 오른쪽 노트 */
.hero { padding: 72px 0 80px; border-bottom: 1px solid var(--rule); }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr); gap: 64px; align-items: center; }
.hero h1 { font-size: clamp(32px, 4.1vw, 50px); line-height: 1.25; margin: 0 0 22px; letter-spacing: -.025em; font-weight: 800; word-break: keep-all; }
.hero p.lead { font-size: clamp(17px, 1.8vw, 20px); color: var(--muted); margin: 0 0 32px; max-width: 32em; word-break: keep-all; }
.hero .kicker { font: 600 15px var(--sans); color: var(--muted); margin: 0 0 18px; }
.hero .kicker b { color: var(--red); font-weight: 700; }
.btns { display: flex; flex-wrap: wrap; gap: 14px 22px; align-items: center; }
.btn { display: inline-flex; align-items: center; min-height: 48px; padding: 0 24px; border-radius: var(--radius); font: 700 16px var(--sans); text-decoration: none; border: 2px solid var(--ink); color: var(--ink); background: transparent; cursor: pointer; }
.btn.p { background: var(--ink); color: var(--paper); }
.btn.p:hover { box-shadow: 4px 4px 0 var(--hl); }
.btn.t { border-color: transparent; padding: 0; min-height: 0; border-bottom: 2px solid var(--rule-strong); border-radius: 0; font-weight: 600; }
.btn.t:hover { border-bottom-color: var(--ink); }
.note { font-size: 14px; color: var(--muted); margin: 16px 0 0; word-break: keep-all; }

/* 영어 4선 노트 — 첫 화면 오른쪽 그림. 글자는 진짜 글자라 읽히고 복사됩니다 */
.nb { position: relative; background: var(--paper); border: 1px solid var(--rule-strong); padding: 30px 28px 24px 64px; box-shadow: 8px 8px 0 var(--rule); }
.nb::before { content: ""; position: absolute; left: 44px; top: 0; bottom: 0; width: 1.5px; background: var(--red); opacity: .55; }
.nb .meta { display: flex; justify-content: space-between; font: 600 12px var(--sans); color: var(--muted); letter-spacing: .04em; margin: 0 0 4px; }
.staff { position: relative; height: 92px; margin: 0 0 6px;
  background:
    linear-gradient(var(--rule-strong), var(--rule-strong)) 0 6px / 100% 1px no-repeat,
    repeating-linear-gradient(90deg, var(--rule-strong) 0 7px, transparent 7px 14px) 0 34px / 100% 1px no-repeat,
    linear-gradient(var(--red), var(--red)) 0 62px / 100% 1.5px no-repeat,
    linear-gradient(var(--rule-strong), var(--rule-strong)) 0 88px / 100% 1px no-repeat; }
.staff span { position: absolute; left: 2px; bottom: 30px; font: 700 clamp(30px, 3.6vw, 44px)/1 var(--serif); letter-spacing: .005em; white-space: nowrap; }
.staff .tick { left: auto; right: 4px; bottom: 36px; color: var(--red); font: 700 30px/1 var(--sans); }
.nb .teacher { font: 600 14px var(--sans); color: var(--red); margin: 10px 0 0; }
.nb .teacher s { color: var(--muted); text-decoration-color: var(--red); font-weight: 400; }

/* 구역 */
section.blk { padding: 76px 0; border-bottom: 1px solid var(--rule); }
section.blk.alt { background: var(--soft); }
.blk .head { max-width: 760px; margin-bottom: 40px; }
.blk h2 { font-size: clamp(26px, 3.6vw, 38px); line-height: 1.3; margin: 0 0 14px; letter-spacing: -.02em; font-weight: 800; word-break: keep-all; }
.blk p.sub { color: var(--muted); margin: 0; word-break: keep-all; font-size: 18px; }

/* 목록 줄 — 카드 격자 대신, 노트 줄처럼 */
.rows { margin: 0; padding: 0; list-style: none; border-top: 2px solid var(--ink); }
.rows li { display: grid; grid-template-columns: minmax(150px, 230px) minmax(0, 1fr); gap: 8px 40px; padding: 22px 0; border-bottom: 1px solid var(--rule-strong); }
.rows .term { font: 700 clamp(22px, 2.6vw, 30px)/1.2 var(--serif); }
.rows .term small { display: block; font: 600 13px var(--sans); color: var(--muted); letter-spacing: 0; margin-top: 4px; }
.rows .body { color: var(--ink); word-break: keep-all; }
.rows .body b { font-weight: 700; }
.rows .body span.d { display: block; color: var(--muted); font-size: 16px; margin-top: 2px; }
a.rowlink { color: inherit; text-decoration: none; }
a.rowlink:hover .term { text-decoration: underline; text-decoration-color: var(--red); text-decoration-thickness: 2px; }
.rows .go { color: var(--blue); font-weight: 700; }

/* 숫자 */
.nums { display: flex; flex-wrap: wrap; border-top: 2px solid var(--ink); border-bottom: 1px solid var(--rule-strong); }
.nums div { flex: 1 1 180px; padding: 22px 24px 22px 0; }
.nums div + div { padding-left: 24px; border-left: 1px solid var(--rule-strong); }
.nums b { display: block; font: 700 clamp(30px, 4vw, 44px)/1.1 var(--serif); }
.nums span { color: var(--muted); font-size: 15px; display: block; margin-top: 4px; word-break: keep-all; }

/* 순서 */
.steps { list-style: none; margin: 0; padding: 0; counter-reset: s; border-left: 2px solid var(--ink); margin-left: 8px; }
.steps li { counter-increment: s; position: relative; padding: 4px 0 28px 36px; word-break: keep-all; }
.steps li:last-child { padding-bottom: 0; }
.steps li::before { content: counter(s); position: absolute; left: -17px; top: 0; width: 32px; height: 32px; border-radius: 50%; background: var(--paper); border: 2px solid var(--ink); display: grid; place-items: center; font: 700 16px var(--serif); }
.steps b { display: block; font-size: 18px; }
.steps span { color: var(--muted); }

/* 질문 */
details { border-bottom: 1px solid var(--rule-strong); }
details:first-of-type { border-top: 2px solid var(--ink); }
details summary { cursor: pointer; font-weight: 700; padding: 18px 28px 18px 0; position: relative; list-style: none; word-break: keep-all; }
details summary::-webkit-details-marker { display: none; }
details summary::after { content: "+"; position: absolute; right: 4px; top: 14px; font: 400 26px/1 var(--sans); color: var(--red); }
details[open] summary::after { content: "–"; }
details p { margin: 0 0 20px; color: var(--muted); max-width: 44em; word-break: keep-all; }

/* 시연 안내 — 쪽지 */
.demo { border: 2px solid var(--ink); padding: 28px 30px; background: var(--paper); box-shadow: 8px 8px 0 var(--hl); max-width: 720px; }
.demo dl { display: grid; grid-template-columns: max-content 1fr; gap: 8px 22px; margin: 20px 0 8px; }
.demo dt { color: var(--muted); font-size: 15px; }
.demo dd { margin: 0; font: 700 17px ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace; word-break: break-all; }

/* 문제 카드 · OMR — 소개용 그림(진짜 글자) */
.q { border: 1px solid var(--rule-strong); box-shadow: 8px 8px 0 var(--rule); background: var(--paper); padding: 26px 28px; }
.q .meta { display: flex; justify-content: space-between; font: 600 12px var(--sans); color: var(--muted); letter-spacing: .04em; margin-bottom: 18px; }
.q .word { font: 700 clamp(38px, 5vw, 58px)/1.05 var(--serif); margin: 0 0 22px; }
.q ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; counter-reset: o; }
.q li { counter-increment: o; display: flex; gap: 14px; align-items: center; padding: 12px 14px; border: 1.5px solid var(--rule-strong); font-weight: 600; }
.q li::before { content: counter(o); width: 26px; height: 26px; border-radius: 50%; border: 1.5px solid var(--rule-strong); display: grid; place-items: center; font: 700 13px var(--serif); flex: none; }
.q li.right { border-color: var(--red); }
.q li.right::before { background: var(--red); border-color: var(--red); color: #fff; }
.q li.right::after { content: "정답"; margin-left: auto; color: var(--red); font: 700 13px var(--sans); }
.omr { border: 1px solid var(--rule-strong); box-shadow: 8px 8px 0 var(--rule); background: var(--paper); padding: 24px 26px; }
.omr .meta { display: flex; justify-content: space-between; font: 600 12px var(--sans); color: var(--muted); letter-spacing: .04em; margin-bottom: 14px; }
.omr .row { display: grid; grid-template-columns: 34px repeat(5, 1fr); gap: 8px; align-items: center; padding: 7px 0; border-bottom: 1px dashed var(--rule); font: 700 15px var(--serif); }
.omr .row:last-child { border-bottom: 0; }
.omr i { display: block; width: 22px; height: 22px; border: 1.5px solid var(--rule-strong); border-radius: 50%; margin: 0 auto; font: 600 11px/19px var(--sans); text-align: center; font-style: normal; color: var(--muted); }
.omr i.on { background: var(--ink); border-color: var(--ink); color: var(--paper); }

/* 문의 폼 */
.cols { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: 56px; align-items: start; }
form.inq { display: grid; gap: 18px; max-width: 620px; }
form.inq label { display: grid; gap: 6px; font-weight: 700; font-size: 15px; }
form.inq label span.opt { font-weight: 400; color: var(--muted); }
form.inq input[type=text], form.inq textarea { font: 17px var(--sans); padding: 12px 2px; border: 0; border-bottom: 2px solid var(--rule-strong); border-radius: 0; background: transparent; color: var(--ink); width: 100%; }
form.inq textarea { min-height: 112px; resize: vertical; }
form.inq input:focus, form.inq textarea:focus { outline: 0; border-bottom-color: var(--ink); background: linear-gradient(transparent 85%, var(--hl) 85%); }
form.inq .agree { display: flex; gap: 12px; align-items: flex-start; font-weight: 400; font-size: 14px; color: var(--muted); }
form.inq .agree input { margin-top: 4px; width: 18px; height: 18px; flex: none; accent-color: var(--ink); }
form.inq .hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.msg { padding: 12px 14px; border-left: 4px solid; font-size: 15px; }
.msg.ok { border-color: var(--ok); color: var(--ok); background: var(--soft); }
.msg.bad { border-color: var(--bad); color: var(--bad); background: var(--soft); }
[hidden] { display: none !important; }

/* 바닥글 */
footer.foot { padding: 40px 0 56px; color: var(--muted); font-size: 14px; }
footer.foot .wrap { display: grid; gap: 14px; }
footer.foot nav { display: flex; gap: 22px; flex-wrap: wrap; }
footer.foot a { color: var(--muted); }
footer.foot b { color: var(--ink); }
.disc { font-size: 13px; line-height: 1.65; }

/* 관리 화면 공용 */
.tag { display: inline-block; font-size: 12px; font-weight: 700; padding: 1px 8px; border: 1px solid var(--rule-strong); color: var(--muted); vertical-align: middle; margin-left: 6px; }
.tag.soon { border-color: var(--red); color: var(--red); }
.item { border: 1px solid var(--rule-strong); padding: 16px 18px; margin-bottom: 12px; }

@media (max-width: 860px) {
  .hero { padding: 48px 0 56px; }
  .hero .wrap, .cols { grid-template-columns: 1fr; gap: 40px; }
  .rows li { grid-template-columns: 1fr; gap: 6px; }
  .nums div + div { border-left: 0; padding-left: 0; }
  section.blk { padding: 52px 0; }
}
@media (max-width: 560px) {
  .wrap { width: calc(100% - 36px); }
  .top .wrap { gap: 12px; }
  .top nav { gap: 14px; }
  .top nav a:not(.cta) { display: none; }
  .brand small { display: none; }
  .nb { padding: 22px 18px 18px 46px; box-shadow: 5px 5px 0 var(--rule); }
  .nb::before { left: 32px; }
  .demo { padding: 22px 20px; box-shadow: 5px 5px 0 var(--hl); }
  .demo dl { grid-template-columns: 1fr; gap: 2px; }
  .demo dd { margin-bottom: 10px; }
  .q, .omr { box-shadow: 5px 5px 0 var(--rule); padding: 20px 18px; }
}
@media print { .top, form.inq { display: none; } }

/* 표 — 시험 구성 */
.scroll { overflow-x: auto; }
table.spec { width: 100%; border-collapse: collapse; font-size: 16px; border-top: 2px solid var(--ink); }
table.spec th, table.spec td { text-align: left; padding: 14px 16px 14px 0; border-bottom: 1px solid var(--rule-strong); vertical-align: top; word-break: keep-all; }
table.spec th { font: 700 13px var(--sans); color: var(--muted); letter-spacing: .04em; }
table.spec td:first-child { font: 700 18px var(--serif); white-space: nowrap; }
.block { border: 2px solid var(--ink); padding: 24px 28px; max-width: 860px; }
.block p { margin: 0; word-break: keep-all; }
.block p + p { margin-top: 10px; }