:root {
  --bg: #F6F8FA;
  --surface: #FFFFFF;
  --ink: #17324D;
  --muted: #4E6175;
  --line: #D6DFE8;
  --soft: #EEF3F7;
  --accent: #0F766E;
  --accent-soft: #E3F3F0;
  --accent-ink: #0B5750;
  --board: #1E3A35;
  --board-2: #24453F;
  --chalk: #F3F1E7;
  --chalk-dim: #BFD0C8;
  --chalk-yellow: #F2DC8C;
  --font: "IBM Plex Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", sans-serif;
  --hand: "Gaegu", "IBM Plex Sans KR", sans-serif;
  --radius: 14px;
  --max: 1080px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0F1720; --surface: #16212C; --ink: #E3EBF2; --muted: #9DB0C2; --line: #2A3A4A; --soft: #1C2935;
    --accent: #3CC4B4; --accent-soft: #143430; --accent-ink: #7FE0D3;
    --board: #15292A; --board-2: #1A3233;
  }
}
:root[data-theme="dark"] {
  --bg: #0F1720; --surface: #16212C; --ink: #E3EBF2; --muted: #9DB0C2; --line: #2A3A4A; --soft: #1C2935;
  --accent: #3CC4B4; --accent-soft: #143430; --accent-ink: #7FE0D3;
  --board: #15292A; --board-2: #1A3233;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--font); font-size: 16px; line-height: 1.7; word-break: keep-all;
}
a { color: var(--accent-ink); }
img { max-width: 100%; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }
@media (max-width: 560px) { .wrap { padding: 0 16px; } }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; background: var(--surface); padding: 8px 12px; z-index: 10; }

/* ---------- 분필 시리즈 띠 (세 홈페이지 공통) */
.series { background: #142722; color: #B9C9C1; font-size: 13px; }
.series .wrap { display: flex; flex-wrap: wrap; gap: 4px 14px; align-items: center; min-height: 34px; padding-block: 6px; }
.series b { color: #F3F1E7; font-weight: 700; }
.series a { color: #B9C9C1; text-decoration: none; }
.series a:hover { color: #F3F1E7; text-decoration: underline; }
.series a[aria-current="page"] { color: #F3F1E7; font-weight: 700; }

/* ---------- header */
.site-head { position: sticky; top: 0; z-index: 5; background: color-mix(in srgb, var(--surface) 92%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.site-head .wrap { display: flex; align-items: center; gap: 20px; min-height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); font-weight: 700; font-size: 19px; white-space: nowrap; }
.brand svg { flex: none; }
.brand small { font-weight: 500; color: var(--muted); font-size: 13px; }
.nav { display: flex; gap: 4px; margin-left: auto; overflow-x: auto; scrollbar-width: none; }
.nav::-webkit-scrollbar { display: none; }
.nav a { text-decoration: none; color: var(--muted); padding: 8px 12px; border-radius: 999px; font-size: 15px; white-space: nowrap; }
.nav a:hover { color: var(--ink); background: var(--soft); }
.nav a[aria-current="page"] { color: var(--accent-ink); background: var(--accent-soft); font-weight: 600; }
.nav a.cta { color: #fff; background: var(--accent); font-weight: 600; }
.nav a.cta:hover { background: var(--accent-ink); }
@media (max-width: 760px) {
  .site-head .wrap { flex-wrap: wrap; gap: 0; padding-top: 10px; }
  .nav { margin: 0 -16px; padding: 6px 16px 10px; width: calc(100% + 32px); }
  .brand small { display: none; }
}

/* ---------- buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 20px; border-radius: 10px; font: inherit; font-weight: 600; text-decoration: none; border: 1px solid transparent; cursor: pointer; }
.btn.primary { background: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-ink); }
.btn.ghost { border-color: var(--line); color: var(--ink); background: var(--surface); }
.btn.ghost:hover { border-color: var(--accent); }
.btn.chalk { background: var(--chalk); color: var(--board); }
.btn.chalk:hover { background: #fff; }
.btn.line-chalk { border-color: rgba(243,241,231,.45); color: var(--chalk); }
.btn.line-chalk:hover { border-color: var(--chalk); }
.btn[aria-disabled="true"] { opacity: .55; pointer-events: none; }

/* ---------- hero (칠판 · 차분하게: 무늬·손글씨·받침대 없이 여백으로) */
.hero { padding: 28px 0 8px; }
.board { position: relative; border-radius: 20px; color: var(--chalk); background: var(--board); padding: 64px 52px 56px; }
.board-grid { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 48px; align-items: start; }
.board .kicker { font-size: 14px; color: var(--chalk-dim); letter-spacing: .04em; margin: 0 0 14px; }
.board h1 { font-size: clamp(28px, 3.5vw, 40px); line-height: 1.32; margin: 0 0 20px; letter-spacing: -0.02em; font-weight: 700; }
.board p.lead { font-size: 18px; color: var(--chalk-dim); max-width: 600px; margin: 0 0 30px; }
.board .actions { display: flex; flex-wrap: wrap; gap: 10px; }
.board .steps4 { list-style: none; margin: 4px 0 0; padding: 0; border-top: 1px solid rgba(243,241,231,.18); }
.board .steps4 li { display: flex; gap: 18px; align-items: baseline; padding: 16px 0; border-bottom: 1px solid rgba(243,241,231,.18); }
.board .steps4 .no { flex: none; width: 24px; font-size: 13px; font-weight: 700; color: var(--chalk-yellow); }
.board .steps4 b { display: block; font-size: 17px; font-weight: 600; }
.board .steps4 .d { font-size: 14px; color: var(--chalk-dim); }
.board .ver { position: absolute; right: 26px; top: 22px; font-size: 13px; color: var(--chalk-dim); border: 1px solid rgba(243,241,231,.3); border-radius: 999px; padding: 3px 10px; text-decoration: none; z-index: 1; }
.board .ver:hover { color: var(--chalk); border-color: var(--chalk); }
@media (max-width: 860px) { .board-grid { grid-template-columns: minmax(0, 1fr); gap: 32px; } }
@media (max-width: 640px) {
  .board { padding: 56px 22px 32px; border-radius: 16px; }
  .board p.lead { font-size: 16px; }
  .board .ver { right: 16px; top: 16px; }
}

/* ---------- sections */
section.block { padding: 64px 0 8px; }
.eyebrow { font-size: 14px; font-weight: 600; color: var(--accent); letter-spacing: .02em; margin: 0 0 6px; }
h2 { font-size: clamp(24px, 3.4vw, 32px); line-height: 1.35; margin: 0 0 12px; letter-spacing: -0.01em; }
.sub { color: var(--muted); margin: 0 0 28px; max-width: 680px; }
.grid { display: grid; gap: 16px; }
.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.g4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 900px) { .g4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } .g3 { grid-template-columns: minmax(0, 1fr); } }
@media (max-width: 560px) { .g2, .g4 { grid-template-columns: minmax(0, 1fr); } }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.card h3 { font-size: 18px; margin: 0 0 6px; }
.card p { margin: 0; color: var(--muted); }
.card .ico { width: 40px; height: 40px; border-radius: 10px; background: var(--accent-soft); color: var(--accent-ink); display: grid; place-items: center; margin-bottom: 14px; }

/* 단계 */
.steps { counter-reset: s; }
.steps .card { position: relative; padding-top: 50px; }
.steps .card::before { counter-increment: s; content: "STEP " counter(s); position: absolute; top: 20px; left: 22px; font-size: 12px; font-weight: 700; color: var(--accent); letter-spacing: .06em; }

/* 사람 */
.who ul { margin: 12px 0 0; padding: 0; list-style: none; }
.who li { padding-left: 18px; position: relative; color: var(--muted); }
.who li + li { margin-top: 4px; }
.who li::before { content: ""; position: absolute; left: 2px; top: .75em; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.who .tag { display: inline-block; font-size: 12px; color: var(--muted); border: 1px solid var(--line); border-radius: 999px; padding: 1px 8px; margin-left: 6px; vertical-align: 2px; font-weight: 500; }

/* 안전 */
.safe { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 8px; }
.safe .row { display: grid; grid-template-columns: 220px 1fr; gap: 16px; padding: 18px 20px; }
.safe .row + .row { border-top: 1px solid var(--line); }
.safe b { font-weight: 600; }
.safe span { color: var(--muted); }
@media (max-width: 640px) { .safe .row { grid-template-columns: 1fr; gap: 2px; } }

/* 도입 */
.offer .card { display: flex; flex-direction: column; }
.offer .card p { flex: 1; }
.offer .card .k { font-size: 13px; color: var(--accent); font-weight: 600; margin-bottom: 4px; }

/* CTA 띠 */
.band { margin: 64px 0 0; background: var(--board); color: var(--chalk); border-radius: 18px; padding: 36px 32px; display: flex; flex-wrap: wrap; gap: 20px; align-items: center; justify-content: space-between; }
.band h2 { margin: 0 0 4px; color: var(--chalk); }
.band p { margin: 0; color: var(--chalk-dim); }
.band .actions { display: flex; flex-wrap: wrap; gap: 10px; }

/* 맨 아래 문의 블록: 분필메모와 같은 밝은 색 */
.band.band-light { background: #FFFDF9; color: #1F1D1A; border: 1px solid #E2D9CB; }
.band.band-light h2 { color: #1F1D1A; }
.band.band-light p { color: #4A443D; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .band.band-light { background: var(--surface); border-color: var(--line); color: var(--ink); }
  :root:not([data-theme="light"]) .band.band-light h2 { color: var(--ink); }
  :root:not([data-theme="light"]) .band.band-light p { color: var(--muted); }
}
:root[data-theme="dark"] .band.band-light { background: var(--surface); border-color: var(--line); color: var(--ink); }
:root[data-theme="dark"] .band.band-light h2 { color: var(--ink); }
:root[data-theme="dark"] .band.band-light p { color: var(--muted); }
.band.band-light .ct i { font-style: normal; color: #6B645A; }
.band.band-light .ct b { font-weight: 700; color: #1F1D1A; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .band.band-light .ct i { color: var(--muted); }
  :root:not([data-theme="light"]) .band.band-light .ct b { color: var(--ink); }
}
:root[data-theme="dark"] .band.band-light .ct i { color: var(--muted); }
:root[data-theme="dark"] .band.band-light .ct b { color: var(--ink); }

/* 페이지 머리 */
.page-head { padding: 48px 0 8px; }
.page-head h1 { font-size: clamp(28px, 4vw, 40px); margin: 0 0 8px; letter-spacing: -0.01em; }
.page-head p { color: var(--muted); margin: 0; max-width: 680px; }

/* 소식 */
.latest { display: flex; flex-wrap: wrap; gap: 12px 24px; align-items: center; background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent); color: var(--accent-ink); border-radius: var(--radius); padding: 16px 20px; margin: 28px 0 8px; }
.latest b { font-size: 20px; }
.timeline { list-style: none; margin: 24px 0 0; padding: 0; }
.timeline > li { display: grid; grid-template-columns: 120px 1fr; gap: 20px; padding: 24px 0; border-top: 1px solid var(--line); }
.timeline .v { font-weight: 700; font-size: 22px; line-height: 1.2; }
.timeline .d { color: var(--muted); font-size: 14px; }
.timeline h3 { margin: 0 0 8px; font-size: 19px; }
.timeline ul { margin: 0; padding-left: 20px; color: var(--muted); }
.timeline .now { display: inline-block; font-size: 12px; font-weight: 600; color: #fff; background: var(--accent); border-radius: 999px; padding: 1px 8px; margin-top: 6px; }
@media (max-width: 560px) { .timeline > li { grid-template-columns: 1fr; gap: 6px; } }

/* 내려받기 */
.doc { display: flex; gap: 16px; align-items: center; }
.doc .ico { margin: 0; flex: none; }
.doc div { flex: 1; min-width: 0; }
.doc .btn { flex: none; }
@media (max-width: 560px) { .doc { flex-wrap: wrap; } .doc .btn { width: 100%; } }
.howto { margin: 0; padding-left: 22px; }
.howto li + li { margin-top: 6px; }
.note { font-size: 14px; color: var(--muted); }

/* 사용 학교 */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin: 24px 0 18px; }
.filters button { font: inherit; font-size: 14px; padding: 6px 14px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); color: var(--muted); cursor: pointer; }
.filters button[aria-pressed="true"] { background: var(--ink); color: var(--surface); border-color: var(--ink); }
.schools { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
.school { display: flex; flex-direction: column; align-items: flex-start; gap: 12px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; text-decoration: none; color: var(--ink); min-height: 170px; transition: border-color .15s, transform .15s; }
a.school:hover { border-color: var(--accent); transform: translateY(-2px); }
.school .logo { width: 56px; height: 56px; border-radius: 14px; display: grid; place-items: center; background: var(--board); color: var(--chalk); font-family: var(--hand); font-size: 26px; overflow: hidden; }
.school .logo img { width: 100%; height: 100%; object-fit: contain; background: #fff; }
.school b { font-size: 22px; line-height: 1.35; font-weight: 700; color: var(--board); letter-spacing: -0.01em; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .school b { color: var(--accent); } }   /* 어두운 화면에서는 칠판색이 안 보여 청록으로 */
:root[data-theme="dark"] .school b { color: var(--accent); }
.school .meta { color: var(--muted); font-size: 14px; margin-top: auto; }
.school .go { font-size: 14px; color: var(--accent-ink); font-weight: 600; }
.school.off .go { color: var(--muted); font-weight: 500; }
.count-line { color: var(--muted); }
.count-line b { color: var(--ink); font-size: 22px; }
.empty { text-align: center; padding: 56px 20px; border: 1px dashed var(--line); border-radius: 18px; color: var(--muted); background: var(--surface); }
.empty .hand { font-family: var(--hand); font-size: 26px; color: var(--ink); margin-bottom: 6px; }

/* footer */
.site-foot { margin-top: 80px; border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: 14px; }
.site-foot .wrap { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; }
.site-foot a { color: var(--muted); }

:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 60%, transparent); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }

/* ---------- 설치·연수 (training) */
.card .k { display: inline-block; font-size: 13px; color: var(--accent); font-weight: 600; margin-bottom: 4px; }
a.card.tlink { display: block; color: inherit; text-decoration: none; }
a.card.tlink:hover { border-color: var(--accent); }
.nav .cta[aria-current="page"] { outline: 2px solid var(--accent-soft); outline-offset: 2px; }

/* 자주 묻는 질문 */
.faq{display:grid;gap:10px;margin-top:24px}
.faq details{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:16px 20px}
.faq summary{font-weight:700;cursor:pointer;color:var(--ink)}
.faq details p{margin-top:8px;color:var(--muted);font-size:15px;line-height:1.7}
.card .go { display: inline-block; margin-top: 10px; font-size: 14px; font-weight: 600; color: var(--accent); }