/*
  Y-Pair 소개 페이지 스타일 — Y 신경망 브랜드(가는 선 · 금속 톤 · 빛 한 점).
  색 토큰은 brand/brand.css와 같은 값이다. 본문 구역은 단색, 첫 화면에만 움직이는 망 배경을 쓴다.
*/
:root {
  --g: #0D1016; --gl: #2A313D; --ti: #6F7888; --st: #C9D0DC; --pt: #ECEFF3;
  --ink: #171B22; --sv: #E4E8EF; --ch: #FFE9BF; --cu: #C78A35;
  --paper: #F8F9FB; --muted: #4A5262; --line: #D5DAE3; --dmuted: #A3ACBA;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body { margin: 0; font: 400 16px/1.75 'Noto Sans KR', system-ui, sans-serif; color: var(--ink); background: var(--paper); -webkit-font-smoothing: antialiased; word-break: keep-all; overflow-wrap: break-word; }
img, svg { max-width: 100%; }
a { color: inherit; }
:focus-visible { outline: 2px solid currentColor; outline-offset: 3px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--sv); color: var(--g); padding: 8px 14px; z-index: 50; }
.skip:focus { left: 8px; }
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.ico { width: 28px; height: 28px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: butt; stroke-linejoin: miter; flex: none; }

/* 머리글 */
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(13,16,22,.94); backdrop-filter: blur(8px); border-bottom: 1px solid var(--gl); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 24px; }
.brand { display: flex; align-items: center; }
.brand img { height: 30px; width: auto; display: block; }
.site-nav { display: flex; align-items: center; gap: 28px; font-size: 14px; }
.site-nav a { color: var(--dmuted); text-decoration: none; }
.site-nav a:hover { color: var(--sv); }
.site-nav .btn { color: var(--g); }

/* 버튼 */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 13px 26px; border-radius: 3px; font: 500 15px/1.2 'Noto Sans KR', sans-serif; text-decoration: none; border: 1px solid transparent; cursor: pointer; transition: background .15s, border-color .15s; }
.btn.light { background: var(--sv); color: var(--g); }
.btn.light:hover { background: #fff; }
.btn.line { border-color: var(--ti); color: var(--sv); background: transparent; }
.btn.line:hover { border-color: var(--st); }
.btn.dark { background: var(--ink); color: var(--pt); }
.btn.dark:hover { background: #000; }
.btn.sm { padding: 9px 18px; font-size: 14px; }

/* 구역 공통 */
.sec { padding: 104px 0; }
.sec.pt { background: var(--pt); }
.sec.dark { background: var(--g) url("assets/honeycomb-tile-dark.svg") repeat; color: var(--sv); }
.sec.dark .lead, .sec.dark .fine { color: var(--dmuted); }
.eyebrow { font: 500 13px/1.4 'Noto Sans KR', sans-serif; letter-spacing: .14em; color: var(--ti); margin: 0 0 14px; }
.sec.dark .eyebrow, .hero .eyebrow, .band .eyebrow, .contact .eyebrow { color: var(--st); }
h1, h2, h3 { margin: 0; font-weight: 500; letter-spacing: -.02em; }
h2 { font-size: clamp(28px, 3.4vw, 40px); line-height: 1.28; margin-bottom: 16px; }
h3 { font-size: 18px; line-height: 1.45; margin-bottom: 8px; }
.lead { color: var(--muted); max-width: 700px; font-size: 18px; margin: 0 0 44px; }
.fine { font-size: 13px; color: var(--muted); }
.rule { height: 6px; background: url("assets/divider-spark-dark.svg") center / 100% 100% no-repeat; }

/* 첫 화면 — 움직이는 불균형 망 */
.hero { background: var(--g) url("assets/organic-wave-dark.svg") center / cover no-repeat; color: var(--sv); padding: 96px 0 104px; border-bottom: 1px solid var(--gl); }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 64px; align-items: center; }
.hero h1 { font-size: clamp(36px, 4.8vw, 60px); line-height: 1.14; letter-spacing: -.035em; color: #fff; margin-bottom: 24px; }
.hero .sub { font-size: 19px; color: var(--st); max-width: 560px; margin: 0 0 36px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }

/* 움직이는 배경 위 글자는 어두운 테두리 빛으로 읽히게 한다 */
.hero h1, .hero .sub, .hero .eyebrow, .band-line, .band .eyebrow, .contact h2, .contact .lead, .contact .eyebrow, .sec.dark h2 { text-shadow: 0 0 14px #0D1016, 0 0 4px #0D1016; }

/* 창 모양 목업 */
.win { background: #11151C; border: 1px solid var(--gl); border-radius: 8px; overflow: hidden; color: var(--sv); box-shadow: none; }
.win.lt { background: #fff; border-color: var(--line); color: var(--ink); }
.win-bar { display: flex; align-items: center; gap: 6px; padding: 10px 14px; border-bottom: 1px solid var(--gl); font-size: 12px; color: var(--dmuted); }
.win.lt .win-bar { border-color: var(--line); color: var(--muted); }
.win-bar i { width: 8px; height: 8px; background: var(--gl); display: inline-block; }
.win.lt .win-bar i { background: var(--line); }
.win-bar span { margin-left: 8px; }
.win-body { display: grid; grid-template-columns: 1.35fr 1fr; }
.pane { padding: 16px 18px; font-size: 14px; }
.pane + .pane { border-left: 1px solid var(--gl); }
.win.lt .pane + .pane { border-color: var(--line); }
.pane-h { font-size: 12px; color: var(--dmuted); margin: 0 0 8px; }
.win.lt .pane-h { color: var(--muted); }
.row { display: flex; justify-content: space-between; gap: 12px; padding: 8px 0; border-top: 1px solid var(--gl); }
.win.lt .row { border-color: var(--line); }
.row b { font-weight: 500; }
.row span { color: var(--dmuted); white-space: nowrap; }
.win.lt .row span { color: var(--muted); }
.queue { margin-top: 14px; border: 1px solid var(--gl); border-radius: 8px; padding: 14px 18px; display: flex; align-items: center; justify-content: space-between; gap: 16px; background: rgba(17,21,28,.92); flex-wrap: wrap; }
.queue small { color: var(--dmuted); display: block; font-size: 13px; }

/* 하루 24시간 */
.tl { max-width: 1040px; margin-bottom: 44px; }
.tl-row { display: flex; align-items: center; gap: 16px; margin-bottom: 10px; font-size: 14px; font-weight: 500; }
.tl-row > b { width: 64px; flex: none; font-weight: 500; }
.tl-track { position: relative; flex: 1; height: 14px; background: var(--line); }
.tl-fill { position: absolute; top: 0; bottom: 0; background: var(--ink); }
.tl-fill.all { left: 0; right: 0; }
.tl-fill.emp { left: 37.5%; width: 37.5%; background: var(--ti); }
.tl-ticks { display: flex; justify-content: space-between; padding-left: 80px; font-size: 12px; color: var(--muted); margin-top: 6px; }
.steps { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); border-top: 1px solid var(--ink); }
.step { padding: 22px 24px 0 0; }
.step .when { font-size: 13px; font-weight: 500; color: var(--cu); letter-spacing: .06em; }
.step h3 { margin-top: 8px; }
.step p { margin: 0; font-size: 14px; color: var(--muted); }

/* 카드 격자 (가는 선) */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.cards.c3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card { background: var(--paper); padding: 30px 28px; }
.sec.pt .card { background: var(--pt); }
.card .ico { color: var(--ink); margin-bottom: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.sec.dark .cards { background: var(--gl); border-color: var(--gl); }
.sec.dark .card { background: var(--g); }
.sec.dark .card .ico { color: var(--st); }
.sec.dark .card p { color: var(--dmuted); }

/* 전용 컴퓨터 */
.own { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: start; }
.feat { display: flex; gap: 18px; padding: 20px 0; border-top: 1px solid var(--line); }
.feat:last-child { border-bottom: 1px solid var(--line); }
.feat p { margin: 0; color: var(--muted); font-size: 15px; }
.own-open { margin-top: 72px; display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.own-open h3 { font-size: clamp(22px, 2.6vw, 30px); line-height: 1.4; margin-bottom: 14px; }
.own-open p { color: var(--muted); margin: 0; }
.note { border: 1px solid var(--line); background: var(--pt); padding: 26px 28px; }
.note h3 { font-size: 16px; }
.note p { font-size: 15px; }

/* 챗봇과 다른 점 */
.cmp { border-top: 1px solid var(--ink); }
.cmp-h, .cmp-r { display: grid; grid-template-columns: 200px 1fr 1.15fr; gap: 28px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.cmp-h { font-size: 14px; font-weight: 500; color: var(--muted); padding: 14px 0; }
.cmp-h b { color: var(--ink); font-weight: 500; }
.cmp-r > b { font-weight: 500; }
.cmp-r > span { color: var(--muted); font-size: 15px; }
.cmp-r > span.yes { color: var(--ink); }

/* 요약 띠 — 벌집 파동 */
.band { background: var(--g) url("assets/honeycomb-wave-dark.svg") center / cover no-repeat; color: var(--sv); padding: 104px 0; border-top: 1px solid var(--gl); border-bottom: 1px solid var(--gl); }
.band-line { margin: 0 0 32px; font-size: clamp(26px, 3.8vw, 48px); line-height: 1.3; font-weight: 500; letter-spacing: -.025em; color: #fff; max-width: 820px; }

/* 하지 않는 것 · 보장 */
.donts { margin-top: 56px; border-left: 1px solid var(--ink); padding-left: 28px; max-width: 760px; }
.donts ul, .plain-list { margin: 10px 0 0; padding-left: 18px; color: var(--muted); }
.donts li, .plain-list li { margin-bottom: 6px; }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--gl); border: 1px solid var(--gl); margin-top: 1px; }
.split > div { background: var(--g); padding: 30px 28px; }
.split ul { margin: 12px 0 0; padding-left: 18px; color: var(--dmuted); }
.split li { margin-bottom: 8px; }
.motto { margin: 56px 0 0; font-size: clamp(22px, 2.8vw, 32px); font-weight: 500; letter-spacing: -.02em; color: #fff; }
.promise { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.promise > div { background: var(--pt); padding: 28px; }
.promise > div.cannot { background: var(--paper); }
.promise p { margin: 0 0 10px; font-size: 15px; color: var(--muted); }

/* 기반 */
.found { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.stack { border: 1px solid var(--line); }
.stack > div { padding: 18px 22px; border-bottom: 1px solid var(--line); font-size: 15px; background: var(--paper); }
.stack > div:last-child { border-bottom: 0; background: var(--pt); color: var(--muted); }
.stack span { color: var(--muted); }

/* 자주 묻는 질문 */
.faq { max-width: 860px; border-top: 1px solid var(--ink); }
.faq details { border-bottom: 1px solid var(--line); padding: 18px 0; }
.faq summary { cursor: pointer; font-weight: 500; font-size: 17px; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::after { content: "+"; color: var(--ti); font-weight: 400; }
.faq details[open] summary::after { content: "−"; }
.faq p { margin: 12px 0 0; color: var(--muted); }

/* 도입 문의 — 벌집 */
.contact { background: var(--g) url("assets/organic-wave-dark.svg") center / cover no-repeat; color: var(--sv); border-top: 1px solid var(--gl); }
.contact-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 64px; align-items: start; }
.contact .lead { color: var(--st); }
.contact form { background: var(--g); border: 1px solid var(--gl); padding: 28px; display: grid; gap: 14px; }
.contact label { display: grid; gap: 6px; font-size: 14px; color: var(--st); }
.contact input, .contact textarea { background: #11151C; color: var(--sv); border: 1px solid var(--gl); border-radius: 3px; padding: 11px 12px; font: inherit; width: 100%; }
.contact input:focus, .contact textarea:focus { border-color: var(--st); outline: 0; }
.contact textarea { min-height: 120px; resize: vertical; }
.contact .hp { position: absolute; left: -9999px; }
.status { margin: 0; min-height: 22px; font-size: 14px; color: var(--st); }

/* 바닥글 */
.site-footer { background: var(--g); color: var(--dmuted); border-top: 1px solid var(--gl); padding: 36px 0; font-size: 13px; }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 16px 32px; align-items: center; justify-content: space-between; }
.site-footer img { height: 26px; }

/* 움직임 줄이기 */
@media (prefers-reduced-motion: reduce) {
  .hero { background-image: url("assets/organic-bg-dark.svg"); }
  .band { background-image: url("assets/honeycomb-bg-dark.svg"); }
  .contact { background-image: url("assets/organic-bg-dark.svg"); }
  .rule { background: linear-gradient(var(--gl), var(--gl)) center / 100% 1px no-repeat; }
  html { scroll-behavior: auto; }
}

/* 작은 화면 */
@media (max-width: 920px) {
  .hero-grid, .own, .own-open, .found, .contact-grid, .split { grid-template-columns: 1fr; gap: 40px; }
  .split { gap: 1px; }
  .steps { grid-template-columns: 1fr; border-top: 0; }
  .step { border-top: 1px solid var(--ink); padding: 18px 0; }
  .cards.c3 { grid-template-columns: 1fr; }
  .cmp-h { display: none; }
  .cmp-r { grid-template-columns: 1fr; gap: 6px; }
  .cmp-r > span:nth-child(2)::before { content: "일반 AI 챗봇 · "; font-weight: 500; }
  .cmp-r > span:nth-child(3)::before { content: "Y-Pair · "; font-weight: 500; color: var(--ink); }
  .sec { padding: 72px 0; }
  .site-nav a:not(.btn) { display: none; }
  .win-body { grid-template-columns: 1fr; }
  .pane + .pane { border-left: 0; border-top: 1px solid var(--gl); }
  .win.lt .pane + .pane { border-top-color: var(--line); }
  .tl-ticks { padding-left: 0; }
}