/* 발전해 소개·안내 페이지 공통 (2026-11-12). about.html · guide.html 이 같이 씀.
   구성은 uber.com 식(검은 상단 바 · 큰 제목 · 그림과 글 교차 · 옵션 목록), 색은 앱과 같게 흑백 + 상태색 3개. */
:root{
  --fg:#111111; --fg2:#555555; --fg3:#8B8B8B; --bg:#FFFFFF; --bg2:#F3F3F1; --edge:#E6E6E3; --ink:#000000;
  --ok:#2E9E5B; --warn:#F5B400; --bad:#D64545;
  --font:'Pretendard',-apple-system,'Apple SD Gothic Neo','Malgun Gothic',sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:130px}
html,body{margin:0}
body{background:var(--bg);color:var(--fg);font-family:var(--font);font-size:18px;line-height:1.7;-webkit-font-smoothing:antialiased;word-break:keep-all;overflow-wrap:break-word}
a{color:inherit}
img{display:block;max-width:100%;height:auto}
.wrap{max-width:1160px;margin:0 auto;padding:0 28px}
p{margin:0 0 18px;max-width:36em;text-wrap:pretty}
.sub{color:var(--fg2)}
.lbl{display:flex;align-items:center;gap:10px;font-size:13px;font-weight:700;letter-spacing:.04em;color:var(--fg3);margin:0 0 16px;max-width:none}
.lbl::before{content:"";width:22px;height:2px;background:currentColor}
h2{font-size:clamp(30px,4.2vw,48px);line-height:1.18;letter-spacing:-.04em;margin:0 0 24px;font-weight:800;text-wrap:balance}
h3{font-size:22px;line-height:1.35;letter-spacing:-.025em;margin:0 0 10px;font-weight:800}
.lead{font-size:20px;line-height:1.65;color:var(--fg2);max-width:32em}
mark{background:linear-gradient(transparent 60%,rgba(245,180,0,.5) 60%);background-size:0% 100%;background-repeat:no-repeat;color:inherit;transition:background-size 1.1s ease .35s;padding:0 2px}
.in mark, mark.in{background-size:100% 100%}
.red{color:var(--bad)}

/* 버튼 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:54px;padding:0 28px;border-radius:999px;border:0;background:var(--ink);color:#fff;font:700 16px var(--font);text-decoration:none;cursor:pointer;transition:transform .18s ease,background .18s ease,box-shadow .18s ease;white-space:nowrap}
.btn:hover{background:#262626;transform:translateY(-2px);box-shadow:0 10px 24px rgba(0,0,0,.18)}
.btn:active{transform:translateY(0)}
.btn.light{background:#fff;color:var(--ink)} .btn.light:hover{background:#ECECEA}
.btn.line{background:transparent;color:inherit;box-shadow:inset 0 0 0 1.5px currentColor;opacity:.9} .btn.line:hover{opacity:1;background:rgba(127,127,127,.12);box-shadow:inset 0 0 0 1.5px currentColor}
.btn .arr{display:inline-block;transition:transform .2s ease} .btn:hover .arr{transform:translateX(4px)}
.btn:focus-visible,a:focus-visible{outline:2px solid var(--warn);outline-offset:3px}

/* 읽은 만큼 차는 줄 */
.prog{position:fixed;left:0;top:0;height:3px;width:100%;background:var(--warn);transform:scaleX(0);transform-origin:0 50%;z-index:40;pointer-events:none}

/* 상단 바 */
.bar{position:sticky;top:0;z-index:30;background:var(--ink);color:#fff}
.bar .wrap{display:flex;align-items:center;gap:30px;height:64px}
.bar header.top{display:contents}
.bar header.top b{font-size:19px}
.bar nav{display:flex;gap:24px;font-size:15px}
.bar nav a{text-decoration:none;color:#BDBDBD;padding:6px 0;transition:color .15s} .bar nav a:hover{color:#fff}
.bar nav a[aria-current]{color:#fff;box-shadow:0 2px 0 #fff}
.bar .btn{height:38px;padding:0 18px;font-size:14px;margin-left:auto}

/* 어두운 첫 화면 */
.hero{position:relative;background:#0B0B0B;color:#fff;overflow:hidden}
.hero .bgimg{position:absolute;inset:-6%;background:center/cover;filter:grayscale(1) brightness(.3);animation:drift 26s ease-in-out infinite alternate}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(0,0,0,.94) 0%,rgba(0,0,0,.72) 50%,rgba(0,0,0,.35) 100%)}
@keyframes drift{to{transform:scale(1.08) translate(-1.5%,-1%)}}
.hero .wrap{position:relative;z-index:1}
.pill{display:inline-flex;align-items:center;gap:8px;height:32px;padding:0 14px;border-radius:999px;background:rgba(255,255,255,.12);font-size:13px;font-weight:700;color:#E5E5E5;margin-bottom:28px}
.pill i{width:7px;height:7px;border-radius:50%;background:var(--bad);animation:blink 1.6s infinite}
@keyframes blink{50%{opacity:.25}}
.hero h1{font-size:clamp(33px,4.1vw,58px);line-height:1.12;letter-spacing:-.05em;margin:0 0 26px;font-weight:800}
.hero h1 .ln{display:block;overflow:hidden;white-space:nowrap;padding-bottom:.06em}
.hero h1 .ln > span{display:inline-block;transform:translateY(105%);animation:rise .9s cubic-bezier(.2,.8,.2,1) forwards}
.hero h1 .ln:nth-child(2) > span{animation-delay:.12s} .hero h1 .ln:nth-child(3) > span{animation-delay:.24s}
@keyframes rise{to{transform:none}}
.hero .lead{color:#C4C4C4;margin-bottom:36px}
.hero .cta{display:flex;gap:12px;flex-wrap:wrap}
.hero .note{font-size:13.5px;color:#8F8F8F;margin-top:14px}

/* 칸 */
section{padding:128px 0}
section.tight{padding:96px 0}
.gray{background:var(--bg2)}
.dark{background:var(--ink);color:#fff}
.dark .sub,.dark .lead{color:#B5B5B5} .dark .lbl{color:#8F8F8F}
.head{margin-bottom:56px}
.cols{display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:center}
.cols.top{align-items:start}

/* 화면 그림 */
.shot{margin:0;border-radius:18px;overflow:hidden;background:#111;box-shadow:0 30px 70px rgba(0,0,0,.22),0 0 0 1px rgba(0,0,0,.08)}
.shot img{width:100%;transition:transform 1.4s cubic-bezier(.2,.8,.2,1)}
.shot:hover img{transform:scale(1.03)}
.shot figcaption{background:#141414;color:#A5A5A5;font-size:13px;line-height:1.5;padding:12px 16px}
.dark .shot,.hero .shot{box-shadow:0 30px 80px rgba(0,0,0,.6),0 0 0 1px rgba(255,255,255,.1)}

/* 나타나기 */
.rv{opacity:0;transform:translateY(26px);transition:opacity .8s ease,transform .9s cubic-bezier(.2,.8,.2,1)}
.rv.in{opacity:1;transform:none}
.rv.l{transform:translateX(-30px)} .rv.r{transform:translateX(30px)} .rv.z{transform:scale(.94)}
.rv.l.in,.rv.r.in,.rv.z.in{transform:none}
.d1{transition-delay:.1s}.d2{transition-delay:.2s}.d3{transition-delay:.3s}.d4{transition-delay:.4s}.d5{transition-delay:.5s}

/* 마무리 + 바닥 */
.close{background:var(--ink);color:#fff;text-align:center;padding:140px 0 120px}
.close p{font-size:clamp(34px,5.4vw,66px);line-height:1.15;letter-spacing:-.05em;font-weight:800;margin:0 auto 42px;max-width:none}
.close .w{display:inline-block;opacity:0;transform:translateY(.5em);transition:opacity .6s ease,transform .7s cubic-bezier(.2,.8,.2,1)}
.close .in .w{opacity:1;transform:none}
.close .btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
footer{background:var(--ink);color:#8F8F8F;font-size:14px;border-top:1px solid #1F1F1F}
footer .wrap{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:30px;padding-top:46px;padding-bottom:32px}
footer p{margin:10px 0 0;max-width:none}
footer header.top b{color:#fff;font-size:18px}
footer a{text-decoration:none;color:#BDBDBD;display:block;margin:4px 0;transition:color .15s} footer a:hover{color:#fff}
footer .fine{grid-column:1/-1;border-top:1px solid #1F1F1F;padding-top:20px;margin-top:10px;font-size:12.5px}

/* 휴대폰 아래 고정 버튼 */
.mbar{display:none}
@media (max-width:900px){
  body{font-size:17px}
  .cols{grid-template-columns:1fr;gap:40px}
  section{padding:84px 0} section.tight{padding:68px 0}
  .head{margin-bottom:36px}
  .bar nav{display:none}
  footer .wrap{grid-template-columns:1fr}
  .mbar{display:flex;position:fixed;left:12px;right:12px;bottom:12px;z-index:35;transform:translateY(130%);transition:transform .35s ease}
  .mbar.on{transform:none}
  .mbar .btn{width:100%;box-shadow:0 10px 30px rgba(0,0,0,.35)}
  .close{padding:96px 0 110px}
}
@media (max-width:520px){ .wrap{padding:0 20px} .hero .cta .btn{width:100%} }
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  .rv,.close .w,.hero h1 .ln > span{opacity:1!important;transform:none!important}
  mark{background-size:100% 100%}
}