/* 업앤챗 소개(랜딩) 페이지 전용 스타일. 약관·방침 페이지는 style.css 를 쓴다.
   구성: 머리띠(고정) → 첫 화면(제목 + 휴대전화 화면 3장) → 신뢰 줄 → 기능 4장(글 + 휴대전화 화면) →
   사용 순서 → 누가 쓰나요 → 데이터 취급 → 자주 묻는 질문 → 마무리 → 바닥글.
   휴대전화 화면은 이미지가 아니라 HTML/CSS 로 그린 예시 화면이다(앱 화면과 같은 구성, 예시 데이터). */
:root {
  color-scheme: light;
  --ink: #0f172a;
  --ink-2: #475569;
  --ink-3: #94a3b8;
  --line: #e5e7eb;
  --line-2: #cbd5e1;
  --paper: #ffffff;
  --bg: #f8fafc;
  --wash: #f1f5f9;
  --blue: #2563eb;
  --blue-2: #1d4ed8;
  --blue-soft: #eff6ff;
  --violet: #7c3aed;
  --ok: #059669;
  --ok-soft: #ecfdf5;
  --amber: #d97706;
  --amber-soft: #fffbeb;
  --red: #dc2626;
  --kakao: #fee500;
  --c-ig: #e1306c;
  --c-th: #101010;
  --c-yt: #ff0000;
  --c-tt: #010101;
  --font: "Pretendard", "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", system-ui, -apple-system, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: var(--font); font-size: 15px; line-height: 1.65;
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
h1, h2, h3, h4, p, li { word-break: keep-all; overflow-wrap: anywhere; }
a { color: inherit; }
img, svg { max-width: 100%; }
.wrap { max-width: 1120px; margin: 0 auto; padding-inline: 20px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
section[id] { scroll-margin-top: 72px; }

/* 머리띠 */
.hd { position: sticky; top: 0; z-index: 20; background: rgba(255,255,255,.9); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.hd .wrap { display: flex; align-items: center; gap: 20px; height: 58px; }
.logo { display: inline-flex; align-items: center; gap: 9px; font-weight: 900; font-size: 18px; letter-spacing: -0.02em; text-decoration: none; white-space: nowrap; }
.logo .mk { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 9px; background: linear-gradient(135deg, var(--blue), var(--violet)); color: #fff; font-size: 12px; font-weight: 900; letter-spacing: 0; }
.logo .sub { font-size: 12px; font-weight: 500; color: var(--ink-3); }
.hd nav.main { display: flex; gap: 18px; font-size: 14px; font-weight: 600; }
.hd nav.main a { color: var(--ink-2); text-decoration: none; white-space: nowrap; }
.hd nav.main a:hover { color: var(--ink); }
.hd .sp { flex: 1; }
nav.lang { font-size: 13px; color: var(--ink-3); white-space: nowrap; }
nav.lang a { color: var(--ink-3); text-decoration: none; padding: 0 3px; }
nav.lang a:hover { text-decoration: underline; }
nav.lang a[aria-current="page"] { color: var(--ink); font-weight: 700; }

/* 단추 */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font-weight: 800; font-size: 15px; text-decoration: none; padding: 13px 24px; border-radius: 12px; border: 1px solid transparent; white-space: nowrap; }
.btn.p { background: var(--ink); color: #fff; }
.btn.p:hover { background: #1e293b; }
.btn.s { background: var(--paper); color: var(--ink); border-color: var(--line-2); }
.btn.s:hover { border-color: var(--ink-3); }
.btn.soon { background: var(--wash); color: var(--ink-2); border-color: var(--line); cursor: default; }
.btn.soon .tag { font-size: 11px; font-weight: 800; background: var(--paper); color: var(--ink-3); border-radius: 6px; padding: 2px 6px; }

/* 첫 화면 */
.hero { padding: 64px 0 28px; text-align: center; }
.pill { display: inline-block; background: var(--blue-soft); color: var(--blue-2); font-size: 13px; font-weight: 700; padding: 6px 14px; border-radius: 999px; margin-bottom: 20px; }
.hero h1 { font-size: clamp(30px, 5.4vw, 58px); font-weight: 900; letter-spacing: -0.04em; line-height: 1.22; margin: 0 0 18px; text-wrap: balance; }
.grad { background: linear-gradient(90deg, var(--blue), var(--violet)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { color: var(--ink-2); font-size: clamp(15px, 1.7vw, 18px); font-weight: 500; max-width: 640px; margin: 0 auto; line-height: 1.75; text-wrap: pretty; }
.hero-cta { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-top: 28px; }
.hero-note { font-size: 13px; color: var(--ink-3); margin-top: 14px; }
.hero-note a { color: var(--ink-2); }
.hero-policy { font-size: 12.5px; color: var(--ink-3); margin-top: 6px; }
.hero-policy a { color: var(--ink-2); text-decoration: none; margin: 0 5px; }
.hero-policy a:hover { text-decoration: underline; }

/* 휴대전화 화면 묶음 */
.stage { margin-top: 44px; background: var(--bg); border: 1px solid #dde2ea; border-radius: 24px; padding: 28px 16px 22px; box-shadow: 0 30px 60px -36px rgba(15,23,42,.35); }
.phones { display: flex; gap: 22px; justify-content: center; align-items: flex-start; flex-wrap: nowrap; overflow-x: auto; scroll-snap-type: x mandatory; padding-bottom: 6px; }
.phones > figure { scroll-snap-align: center; margin: 0; flex: 0 0 auto; }
figure.ph { margin: 0; }
figure.ph figcaption { text-align: center; font-size: 13px; font-weight: 700; color: var(--ink-2); margin-top: 12px; }
figure.ph figcaption small { display: block; font-weight: 500; color: var(--ink-3); font-size: 12px; }

/* 휴대전화 틀 */
.phone { width: 280px; background: #fff; border: 2px solid #94a3b8; border-radius: 30px; overflow: hidden; box-shadow: 0 1px 2px rgba(15,23,42,.06), 0 24px 44px -28px rgba(15,23,42,.4); text-align: left; font-size: 13px; line-height: 1.45; color: var(--ink); }
.phone .sb { display: flex; justify-content: space-between; align-items: center; padding: 10px 18px 0; font-size: 11px; font-weight: 700; color: var(--ink-2); }
.phone .sb i { display: inline-block; width: 42px; height: 6px; border-radius: 99px; background: #e2e8f0; }
.phone .scr { padding: 10px 14px 16px; min-height: 420px; display: flex; flex-direction: column; gap: 10px; }
.phone .tt { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.phone .tt b { font-size: 16px; font-weight: 800; letter-spacing: -0.02em; }
.phone .tt span { font-size: 11px; color: var(--ink-3); }
.phone .card { background: var(--paper); border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; }
.phone .lbl { font-size: 11px; font-weight: 700; color: var(--ink-3); margin-bottom: 6px; }
.phone .big { background: var(--blue); color: #fff; font-weight: 800; text-align: center; border-radius: 12px; padding: 11px; margin-top: auto; }
.phone .big.k { background: var(--kakao); color: #191919; }
.phone .big.w { background: var(--paper); color: var(--ink); border: 1px solid var(--line-2); }
.phone .tabbar { display: flex; justify-content: space-around; border-top: 1px solid var(--line); padding: 8px 0 2px; font-size: 10px; color: var(--ink-3); font-weight: 700; }
.phone .tabbar span.on { color: var(--blue); }

/* 작은 부품: 플랫폼 표시·사진·댓글 */
.lg { display: inline-grid; place-items: center; width: 20px; height: 20px; border-radius: 6px; color: #fff; font-size: 9px; font-weight: 900; flex: none; letter-spacing: 0; }
.lg.ig { background: linear-gradient(135deg, #f58529, #dd2a7b 55%, #8134af); }
.lg.th { background: var(--c-th); }
.lg.yt { background: var(--c-yt); }
.lg.tt { background: var(--c-tt); box-shadow: inset -2px -2px 0 #25f4ee, inset 2px 2px 0 #fe2c55; }
.lg.lg-l { width: 28px; height: 28px; border-radius: 8px; font-size: 11px; }
.chips { display: flex; gap: 6px; flex-wrap: wrap; }
.chip { display: inline-flex; align-items: center; gap: 6px; padding: 5px 8px 5px 5px; border-radius: 10px; border: 1px solid var(--line); background: var(--paper); font-size: 11.5px; font-weight: 700; color: var(--ink-2); }
.chip.on { border-color: var(--blue); background: var(--blue-soft); color: var(--blue-2); }
.chip.off { opacity: .45; }
.chip .ck { width: 14px; height: 14px; border-radius: 50%; background: var(--ok); color: #fff; font-size: 9px; display: grid; place-items: center; }
.media { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.media span { aspect-ratio: 1; border-radius: 8px; display: block; }
.media span.add { border: 1.5px dashed var(--line-2); display: grid; place-items: center; color: var(--ink-3); font-weight: 800; }
.m1 { background: linear-gradient(135deg, #fde68a, #f59e0b); }
.m2 { background: linear-gradient(135deg, #bfdbfe, #3b82f6); }
.m3 { background: linear-gradient(135deg, #fbcfe8, #ec4899); }
.m4 { background: linear-gradient(135deg, #bbf7d0, #10b981); }
.m5 { background: linear-gradient(135deg, #ddd6fe, #8b5cf6); }
.txtbox { font-size: 12.5px; line-height: 1.5; color: var(--ink-2); }
.txtbox .cnt { display: block; text-align: right; font-size: 10.5px; color: var(--ink-3); margin-top: 4px; }
.row { display: flex; align-items: center; gap: 8px; }
.row.sb2 { justify-content: space-between; }
.tgl { position: relative; width: 34px; height: 20px; border-radius: 999px; background: var(--blue); flex: none; }
.tgl::after { content: ""; position: absolute; top: 2px; left: 16px; width: 16px; height: 16px; border-radius: 50%; background: #fff; }
.tgl.off { background: var(--line-2); }
.tgl.off::after { left: 2px; }
.cm { display: flex; gap: 8px; align-items: flex-start; padding: 10px 0; border-top: 1px solid var(--wash); }
.cm:first-child { border-top: 0; padding-top: 0; }
.av { position: relative; width: 30px; height: 30px; border-radius: 50%; flex: none; display: grid; place-items: center; color: #fff; font-size: 11px; font-weight: 800; }
.av .lg { position: absolute; right: -4px; bottom: -4px; width: 14px; height: 14px; border-radius: 4px; font-size: 7px; box-shadow: 0 0 0 2px #fff; }
.a1 { background: #f97316; } .a2 { background: #0ea5e9; } .a3 { background: #a855f7; } .a4 { background: #14b8a6; }
.cm .who { font-size: 12px; font-weight: 700; }
.cm .who small { font-weight: 500; color: var(--ink-3); margin-left: 5px; }
.cm .txt { font-size: 12.5px; color: #1e293b; margin-top: 1px; }
.cm .acts { display: flex; gap: 10px; font-size: 11px; color: var(--ink-3); font-weight: 700; margin-top: 5px; }
.cm .acts b { color: var(--blue); }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--blue); flex: none; margin-top: 10px; }
.dot.off { background: transparent; }
.bub { display: inline-block; max-width: 86%; padding: 8px 11px; border-radius: 14px; font-size: 12.5px; line-height: 1.45; }
.bub.in { background: var(--wash); border-bottom-left-radius: 4px; }
.bub.out { background: var(--blue-soft); color: var(--blue-2); border-bottom-right-radius: 4px; align-self: flex-end; }
.bubs { display: flex; flex-direction: column; gap: 6px; }
.auto { font-size: 10px; font-weight: 900; color: var(--violet); background: #f5f3ff; border-radius: 4px; padding: 1px 6px; margin-left: 4px; vertical-align: 1px; }
.btns { display: grid; gap: 5px; margin-top: 6px; }
.btns span { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 7px; text-align: center; font-size: 12px; font-weight: 700; color: var(--blue-2); }
.st { font-size: 11px; font-weight: 800; border-radius: 999px; padding: 2px 8px; white-space: nowrap; }
.st.ok { color: var(--ok); background: var(--ok-soft); }
.st.wait { color: var(--amber); background: var(--amber-soft); }
.st.fail { color: var(--red); background: #fef2f2; }
.st.sch { color: var(--blue-2); background: var(--blue-soft); }
.kw { display: inline-block; white-space: nowrap; font-size: 11px; font-weight: 700; padding: 2px 8px; border-radius: 999px; background: var(--wash); color: var(--ink-2); border: 1px solid var(--line); }
.kw.on { background: var(--blue-soft); color: var(--blue-2); border-color: #bfdbfe; }
.noti { display: flex; gap: 10px; align-items: flex-start; background: rgba(255,255,255,.92); border-radius: 14px; padding: 10px 12px; box-shadow: 0 6px 18px -8px rgba(15,23,42,.3); }
.noti .ic { width: 30px; height: 30px; border-radius: 8px; background: linear-gradient(135deg, var(--blue), var(--violet)); color: #fff; display: grid; place-items: center; font-size: 11px; font-weight: 900; flex: none; }
.noti b { display: block; font-size: 12.5px; }
.noti span { font-size: 12px; color: var(--ink-2); }
.noti small { display: block; font-size: 10px; color: var(--ink-3); margin-top: 2px; }
.lock { background: linear-gradient(160deg, #1e3a8a, #6d28d9); border-radius: 18px; padding: 16px 12px; display: flex; flex-direction: column; gap: 8px; }
.lock .tm { color: #fff; text-align: center; font-size: 30px; font-weight: 300; letter-spacing: .02em; margin-bottom: 4px; }
.lock .tm small { display: block; font-size: 11px; opacity: .8; }

/* 신뢰 줄 */
.trust { padding: 28px 0 8px; }
.trust-in { display: flex; align-items: center; justify-content: center; gap: 12px 28px; flex-wrap: wrap; font-size: 13.5px; color: var(--ink-2); }
.trust-lg { display: flex; gap: 8px; align-items: center; }
.trust-lg .lg { width: 28px; height: 28px; border-radius: 8px; font-size: 11px; }
.trust-lg small { font-size: 11px; color: var(--ink-3); font-weight: 700; margin-left: 2px; }
.trust-in .it { display: inline-flex; align-items: center; gap: 7px; }
.trust-in .it::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--ok); }

/* 기능 장 */
section.f { padding: 88px 0 72px; border-top: 1px solid #f1f4f8; }
.chead { text-align: center; max-width: 720px; margin: 0 auto 44px; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 800; color: var(--blue); }
.eyebrow::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; box-shadow: 0 0 0 4px var(--blue-soft); }
section.f h2 { font-size: clamp(26px, 4.2vw, 44px); font-weight: 900; letter-spacing: -0.035em; line-height: 1.3; margin: 16px 0 14px; text-wrap: balance; }
.chead p { color: var(--ink-2); font-size: clamp(15px, 1.6vw, 17px); margin: 0 auto; max-width: 600px; }
.blk { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: 36px 48px; align-items: center; }
.blk + .blk { margin-top: 80px; }
.blk.rev .txt-col { order: 2; }
.blk h3 { font-size: clamp(21px, 2.6vw, 29px); font-weight: 900; letter-spacing: -0.03em; line-height: 1.32; margin: 0 0 12px; text-wrap: balance; }
.blk p.d { color: var(--ink-2); margin: 0 0 18px; font-size: 15px; }
.ticks { list-style: none; margin: 0; padding: 0; display: grid; gap: 9px; font-size: 14.5px; }
/* li 안에 <b> 와 글자가 섞여 있어 grid 로 두면 글자가 따로 칸을 차지한다 → 들여쓰기 + 절대 위치 표시 */
.ticks li { position: relative; padding-left: 26px; line-height: 1.55; }
.ticks li::before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--blue); font-weight: 900; }
.ticks b { font-weight: 700; }
.shot { display: flex; gap: 14px; align-items: flex-start; justify-content: center; flex-wrap: wrap; }
.side { width: 232px; display: grid; gap: 10px; }
.side .card { background: var(--paper); border: 1px solid var(--line); border-radius: 14px; padding: 12px 14px; font-size: 13px; box-shadow: 0 12px 30px -24px rgba(15,23,42,.35); }
.side .card .t { font-size: 12px; font-weight: 800; color: var(--ink-3); margin-bottom: 8px; }
.res { display: grid; gap: 7px; }
.res div { display: grid; grid-template-columns: 20px minmax(0, 1fr) auto; gap: 8px; align-items: center; }
.res .nm { font-weight: 700; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.res .nm small { font-weight: 500; color: var(--ink-3); margin-left: 4px; }
.rule { display: grid; gap: 8px; }
.rule .r { display: grid; grid-template-columns: 54px minmax(0, 1fr); gap: 8px; align-items: start; font-size: 12.5px; }
.rule .r b { font-size: 11px; color: var(--ink-3); font-weight: 800; padding-top: 2px; }
.rule .r .v { color: var(--ink); }

/* 사용 순서 */
.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; counter-reset: s; }
.step { position: relative; background: var(--paper); border: 1px solid var(--line); border-radius: 18px; padding: 22px 20px 20px; counter-increment: s; }
.step::before { content: counter(s); display: grid; place-items: center; width: 32px; height: 32px; border-radius: 50%; background: var(--ink); color: #fff; font-weight: 800; font-size: 14px; margin-bottom: 14px; }
.step b { display: block; font-size: 17px; font-weight: 900; margin-bottom: 6px; letter-spacing: -0.02em; }
.step p { margin: 0; font-size: 14px; color: var(--ink-2); }
.step .mini { margin-top: 14px; background: var(--bg); border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; font-size: 12.5px; display: grid; gap: 6px; }

/* 누가 쓰나요 */
.cards4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.who { border: 1px solid var(--line); border-radius: 18px; padding: 20px; background: var(--paper); min-width: 0; }
.who .em { font-size: 26px; line-height: 1; margin-bottom: 12px; }
.who h4 { margin: 0 0 4px; font-size: 17px; font-weight: 900; }
.who p { margin: 0 0 12px; font-size: 13px; color: var(--ink-2); }
.who ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; font-size: 13px; }
.who li { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 7px; align-items: baseline; }
.who li span { font-size: 10.5px; font-weight: 800; border-radius: 4px; padding: 1px 6px; white-space: nowrap; }
.t1 { background: var(--blue-soft); color: var(--blue-2); }
.t2 { background: #f5f3ff; color: var(--violet); }
.t3 { background: var(--ok-soft); color: var(--ok); }

/* 데이터 취급 */
.tiles4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.tile { background: var(--bg); border: 1px solid var(--line); border-radius: 18px; padding: 20px; }
.tile .ic { width: 38px; height: 38px; border-radius: 12px; background: var(--paper); border: 1px solid var(--line); display: grid; place-items: center; font-size: 17px; margin-bottom: 12px; }
.tile b { display: block; font-size: 15.5px; font-weight: 900; margin-bottom: 5px; }
.tile p { margin: 0; font-size: 13.5px; color: var(--ink-2); }
.data-note { text-align: center; font-size: 13.5px; color: var(--ink-2); margin-top: 18px; }
.data-note a { color: var(--blue-2); }

/* 자주 묻는 질문 */
.faq { max-width: 760px; margin: 0 auto; display: grid; gap: 8px; }
.faq details { border: 1px solid var(--line); border-radius: 14px; background: var(--paper); padding: 0 18px; }
.faq summary { cursor: pointer; list-style: none; font-weight: 800; font-size: 15.5px; padding: 15px 0; display: flex; justify-content: space-between; gap: 12px; align-items: center; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 20px; color: var(--ink-3); font-weight: 400; }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 0 0 16px; color: var(--ink-2); font-size: 14.5px; }

/* 마무리 */
.cta-band { margin: 40px 0 0; background: linear-gradient(135deg, #1e3a8a, #6d28d9); color: #fff; border-radius: 26px; padding: 52px 24px; text-align: center; }
.cta-band h2 { font-size: clamp(24px, 3.6vw, 38px); font-weight: 900; letter-spacing: -0.03em; margin: 0 0 10px; }
.cta-band p { margin: 0 auto 22px; max-width: 560px; opacity: .9; }
.cta-band .btn.s { border-color: rgba(255,255,255,.4); background: rgba(255,255,255,.12); color: #fff; }
.cta-band .btn.p { background: #fff; color: var(--ink); }

/* 바닥글 */
footer.ft { border-top: 1px solid var(--line); margin-top: 72px; padding: 32px 0 40px; font-size: 13px; color: var(--ink-2); }
footer.ft .row1 { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; align-items: center; }
footer.ft nav { display: flex; gap: 16px; flex-wrap: wrap; }
footer.ft nav a { color: var(--ink-2); text-decoration: none; }
footer.ft nav a:hover { text-decoration: underline; }
footer.ft .biz { margin-top: 16px; font-size: 12.5px; color: var(--ink-3); line-height: 1.7; }

/* 반응형 */
@media (max-width: 980px) {
  .hd nav.main { display: none; }
  .blk { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .blk.rev .txt-col { order: 0; }
  .cards4, .tiles4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .hero { padding-top: 44px; }
  .stage { padding: 18px 10px 14px; border-radius: 18px; }
  .phones { justify-content: flex-start; gap: 14px; padding-inline: 4px; }
  .phone { width: 256px; }
  section.f { padding: 64px 0 52px; }
  .steps, .cards4, .tiles4 { grid-template-columns: minmax(0, 1fr); }
  .side { width: 100%; max-width: 280px; }
  .hd .wrap { gap: 12px; }
  .logo .sub { display: none; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }