@import url("https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/variable/pretendardvariable-dynamic-subset.min.css");
@import url("https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&display=swap");

:root{
  --ink:#0f1720;
  --ink-2:#2b3440;
  --muted:#667085;
  --line:#e3e8ef;
  --line-2:#d3dbe6;
  --paper:#f5f7fa;
  --white:#fff;
  --blue:#1591d6;
  --blue-deep:#2b6fb5;
  --blue-soft:#e7f3fb;
  --radius-lg:22px;
  --radius-md:14px;
  --radius-sm:10px;
  --shadow:0 24px 60px -24px rgba(16,40,70,.22);
  --shadow-soft:0 10px 30px -14px rgba(16,40,70,.16);
  --serif:"Instrument Serif", Georgia, serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:"Pretendard Variable",Pretendard,sans-serif;
  background:var(--paper);color:var(--ink);font-size:15.5px;line-height:1.65;
  letter-spacing:-.012em;word-break:keep-all;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
button,input,textarea,select{font:inherit;color:inherit}
button{cursor:pointer}
.wrap{width:min(1200px,calc(100% - 40px));margin:0 auto}
.hidden{display:none!important}

/* ---------- header ---------- */
.topbar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.88);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}
.topbar-inner{height:74px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{border:0;background:none;padding:0;display:flex;align-items:center}
.brand img{height:34px;width:auto}
.nav{display:flex;align-items:center;gap:2px}
.nav-btn{white-space:nowrap;border:0;background:none;padding:9px 14px;border-radius:999px;font-weight:600;font-size:14.5px;color:var(--ink-2);transition:.18s}
.nav-btn:hover{background:var(--paper);color:var(--ink)}
.nav-btn.active{color:var(--blue-deep);background:var(--blue-soft)}
.nav-sep{width:1px;height:18px;background:var(--line-2);margin:0 8px}
.nav-btn.solid{background:var(--ink);color:#fff;padding:9px 18px}
.nav-btn.solid:hover{background:var(--blue-deep)}
.menu-btn{display:none;border:1px solid var(--line);background:#fff;width:42px;height:42px;border-radius:12px}
.menu-btn span{display:block;width:18px;height:2px;background:var(--ink);margin:4px auto;border-radius:2px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:10px;border:1px solid transparent;border-radius:999px;padding:14px 24px;font-weight:700;font-size:15px;transition:.2s;background:var(--ink);color:#fff}
.btn:hover{transform:translateY(-1px);background:var(--blue-deep)}
.btn.blue{background:var(--blue)}
.btn.blue:hover{background:var(--blue-deep)}
.btn.ghost{background:#fff;color:var(--ink);border-color:var(--line-2)}
.btn.ghost:hover{border-color:var(--ink);background:#fff}
.btn.sm{padding:9px 16px;font-size:13.5px}
.btn .arr{transition:transform .2s}
.btn:hover .arr{transform:translateX(3px)}

/* ---------- typography ---------- */
.kicker{display:inline-flex;align-items:center;gap:10px;font-size:12.5px;font-weight:700;letter-spacing:.16em;color:var(--blue-deep);text-transform:uppercase}
.kicker::before{content:"";width:22px;height:2px;background:var(--blue)}
.h-display{font-size:clamp(44px,6.2vw,84px);line-height:1.08;letter-spacing:-.045em;font-weight:800;margin:18px 0 0;text-wrap:balance}
.h-display em{font-family:var(--serif);font-style:italic;font-weight:400;letter-spacing:-.01em;color:var(--blue)}
.h-section{font-size:clamp(30px,4vw,48px);line-height:1.15;letter-spacing:-.04em;font-weight:800;margin:14px 0 0;text-wrap:balance}
.lead{font-size:18px;color:var(--muted);max-width:560px;margin:22px 0 0;text-wrap:pretty}
.desc{color:var(--muted);margin:14px 0 0;max-width:560px;text-wrap:pretty}

/* ---------- pages ---------- */
.page{display:none;animation:fade .45s ease}
.page.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.block{padding:96px 0}
.block.tight{padding:64px 0}
.sec-head{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;margin-bottom:40px}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;background:#fff;border-bottom:1px solid var(--line)}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center;padding:88px 0 96px;position:relative;z-index:1}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:36px}
.hero-k{position:absolute;right:-8%;top:-10%;width:62%;height:130%;pointer-events:none;opacity:.07}
.hero-k::before,.hero-k::after{content:"";position:absolute;background:var(--blue)}
.hero-k::before{left:22%;top:0;width:16%;height:100%}
.hero-k::after{left:38%;top:0;width:18%;height:100%;transform:skewX(-38deg);transform-origin:top left}
.hero-card{position:relative;background:#fff;border:1px solid var(--line);border-radius:28px;box-shadow:var(--shadow);padding:44px}
.hero-card img{width:78%;margin:0 auto}
.hero-note{position:absolute;left:-36px;bottom:-30px;background:var(--ink);color:#fff;border-radius:18px;padding:20px 22px;max-width:290px;box-shadow:var(--shadow)}
.hero-note strong{display:block;font-size:16px;margin-bottom:6px}
.hero-note p{margin:0;font-size:13.5px;color:#b8c2cf;line-height:1.6}
.hero-tag{position:absolute;right:-14px;top:28px;background:var(--blue);color:#fff;font-weight:700;font-size:13px;padding:8px 14px;border-radius:999px;box-shadow:var(--shadow-soft)}

/* sentence parse demo */
.parse{margin-top:44px;padding:18px 20px;border:1px dashed var(--line-2);border-radius:var(--radius-md);background:var(--paper);max-width:560px}
.parse-label{font-size:12px;font-weight:700;letter-spacing:.12em;color:var(--muted);margin-bottom:10px}
.parse-line{display:flex;flex-wrap:wrap;gap:6px 4px;font-size:17px;font-weight:600}
.tok{position:relative;padding:2px 6px 16px;border-radius:6px;white-space:nowrap;flex-shrink:0}
.tok small{position:absolute;left:6px;bottom:0;font-size:10.5px;font-weight:700;letter-spacing:.06em}
.tok.s{background:#e7f3fb;color:#155d8f}.tok.s small{color:#1591d6}
.tok.v{background:#0f1720;color:#fff}.tok.v small{color:#8fd0f5}
.tok.o{background:#eef1f5;color:var(--ink-2)}.tok.o small{color:var(--muted)}
.tok.m{color:var(--muted);font-weight:500}.tok.m small{color:#98a2b3}

/* ---------- stats ---------- */
.stats{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);border-radius:var(--radius-lg);background:#fff;overflow:hidden}
.stat{padding:34px 32px;border-right:1px solid var(--line)}
.stat:last-child{border-right:0}
.stat-num{font-size:48px;font-weight:800;letter-spacing:-.05em;line-height:1}
.stat-num span{color:var(--blue)}
.stat-label{margin-top:10px;color:var(--muted);font-weight:500}

/* ---------- features ---------- */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.feature{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:32px;transition:.25s}
.feature:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:transparent}
.feature-no{font-family:var(--serif);font-size:40px;color:var(--blue);line-height:1}
.feature h3{font-size:21px;letter-spacing:-.03em;margin:26px 0 10px}
.feature p{margin:0;color:var(--muted)}

/* method strip */
.method{background:var(--ink);color:#fff;border-radius:28px;padding:64px;display:grid;grid-template-columns:.9fr 1.1fr;gap:56px;position:relative;overflow:hidden}
.method .kicker{color:#8fd0f5}.method .kicker::before{background:#8fd0f5}
.method .desc{color:#a9b4c2}
.steps{display:grid;gap:12px}
.step{display:grid;grid-template-columns:56px 1fr;gap:18px;align-items:start;padding:20px 22px;border:1px solid rgba(255,255,255,.1);border-radius:var(--radius-md);background:rgba(255,255,255,.03)}
.step b{font-family:var(--serif);font-size:30px;font-weight:400;color:#8fd0f5;line-height:1}
.step h4{margin:0 0 4px;font-size:17px}
.step p{margin:0;color:#a9b4c2;font-size:14.5px}

/* ---------- placeholders ---------- */
.ph{position:relative;background:repeating-linear-gradient(135deg,#eef2f7 0 10px,#e6ebf2 10px 20px);display:flex;align-items:center;justify-content:center;color:#8a96a8;font-family:ui-monospace,Menlo,monospace;font-size:12px;letter-spacing:.02em}
.ph.dark{background:repeating-linear-gradient(135deg,#1c2632 0 10px,#18212c 10px 20px);color:#6b7a8d}

/* ---------- videos ---------- */
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.video{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;cursor:pointer;transition:.25s}
.video:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.video .ph{aspect-ratio:16/9}
.play{position:absolute;width:54px;height:54px;border-radius:50%;background:rgba(255,255,255,.95);display:grid;place-items:center;box-shadow:var(--shadow-soft)}
.play::after{content:"";border-left:14px solid var(--ink);border-top:9px solid transparent;border-bottom:9px solid transparent;margin-left:4px}
.video-body{padding:18px 20px 22px}
.chip{display:inline-block;font-size:12px;font-weight:700;color:var(--blue-deep);background:var(--blue-soft);padding:4px 10px;border-radius:999px}
.video-body h4{margin:10px 0 4px;font-size:17px;letter-spacing:-.02em}
.video-body p{margin:0;font-size:13.5px;color:var(--muted)}
.video.feat{grid-column:span 2;grid-row:span 2}
.video.feat h4{font-size:22px}

/* ---------- books ---------- */
.filters{display:flex;gap:8px;flex-wrap:wrap}
.filter{border:1px solid var(--line-2);background:#fff;border-radius:999px;padding:8px 16px;font-size:14px;font-weight:600;color:var(--ink-2);transition:.18s}
.filter:hover{border-color:var(--ink)}
.filter.on{background:var(--ink);color:#fff;border-color:var(--ink)}
.book-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.book{cursor:pointer}
.book-cover{aspect-ratio:3/4;border-radius:12px;overflow:hidden;box-shadow:var(--shadow-soft);transition:.3s;position:relative}
.book:hover .book-cover{transform:translateY(-6px) rotate(-1deg);box-shadow:var(--shadow)}
.cover-art{position:absolute;inset:0;padding:22px;display:flex;flex-direction:column;justify-content:space-between;color:#fff}
.cover-art .t{font-size:22px;font-weight:800;letter-spacing:-.04em;line-height:1.2}
.cover-art .s{font-size:11px;letter-spacing:.14em;opacity:.8;font-weight:600}
.cover-art .bar{position:absolute;left:0;top:0;bottom:0;width:10px;background:rgba(0,0,0,.18)}
.book h4{margin:16px 0 2px;font-size:16.5px;letter-spacing:-.02em}
.book p{margin:0;color:var(--muted);font-size:13.5px}

/* ---------- board ---------- */
.board{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden}
.board-row{display:grid;grid-template-columns:92px 1fr 110px 110px;gap:16px;align-items:center;padding:18px 24px;border-bottom:1px solid var(--line);cursor:pointer;transition:background .15s}
.board-row:last-child{border-bottom:0}
.board-row:hover{background:#fafbfd}
.board-row.head{cursor:default;background:var(--paper);font-size:13px;font-weight:700;color:var(--muted);padding:12px 24px}
.board-row .title{font-weight:600;display:flex;align-items:center;gap:8px;min-width:0}
.board-row .title span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.board-row .meta{font-size:13.5px;color:var(--muted)}
.tag{font-size:12px;font-weight:700;padding:4px 10px;border-radius:999px;background:var(--paper);color:var(--ink-2);justify-self:start}
.tag.notice{background:var(--ink);color:#fff}
.tag.qna{background:var(--blue-soft);color:var(--blue-deep)}
.badge{font-size:11px;font-weight:700;padding:2px 8px;border-radius:999px;border:1px solid var(--line-2);color:var(--muted);flex-shrink:0}
.badge.done{border-color:var(--blue);color:var(--blue)}
.lock{font-size:12px;color:var(--muted);flex-shrink:0}

/* ---------- gallery ---------- */
.gallery{display:grid;grid-template-columns:repeat(4,1fr);grid-auto-rows:220px;gap:14px}
.g-item{border-radius:var(--radius-md);overflow:hidden;position:relative;cursor:pointer}
.g-item .ph{position:absolute;inset:0;transition:transform .4s}
.g-item:hover .ph{transform:scale(1.04)}
.g-cap{position:absolute;left:0;right:0;bottom:0;padding:14px 16px;background:linear-gradient(transparent,rgba(15,23,32,.82));color:#fff;font-weight:600;font-size:14px;opacity:0;transition:.25s;display:flex;flex-direction:column;gap:3px}
.g-item:hover .g-cap{opacity:1}
.g-date{font-size:11.5px;font-weight:400;opacity:.85;margin-top:2px}
.g-item.w2{grid-column:span 2}.g-item.h2{grid-row:span 2}

/* ---------- page header ---------- */
.page-hero{background:#fff;border-bottom:1px solid var(--line);padding:72px 0 56px;position:relative;overflow:hidden}
.page-hero .hero-k{opacity:.05;width:40%}

/* ---------- profile ---------- */
.profile{display:grid;grid-template-columns:380px 1fr;gap:56px;align-items:start}
.profile-photo{border-radius:24px;overflow:hidden;aspect-ratio:4/5;position:sticky;top:100px}
.profile-photo .ph{position:absolute;inset:0}
.profile-name{font-size:40px;font-weight:800;letter-spacing:-.045em;margin:10px 0 0}
.profile-role{color:var(--blue-deep);font-weight:700}
.quote{font-family:var(--serif);font-size:32px;line-height:1.3;margin:32px 0;padding:0 0 32px;border-bottom:1px solid var(--line);color:var(--ink);letter-spacing:-.01em}
.quote-ko{display:block;font-family:"Pretendard Variable",sans-serif;font-size:17px;color:var(--muted);margin-top:10px;letter-spacing:-.02em}
.p-sec{display:grid;grid-template-columns:140px 1fr;gap:24px;padding:28px 0;border-bottom:1px solid var(--line)}
.p-sec h5{margin:0;font-size:13px;letter-spacing:.14em;color:var(--muted);font-weight:700;padding-top:3px}
.p-sec p{margin:0;color:var(--ink-2)}
.timeline{list-style:none;padding:0;margin:0;display:grid;gap:12px}
.timeline li{display:grid;grid-template-columns:90px 1fr;gap:14px;color:var(--ink-2)}
.timeline li b{color:var(--blue-deep);font-weight:700;font-variant-numeric:tabular-nums}

/* ---------- auth ---------- */
.auth{max-width:440px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:24px;padding:44px;box-shadow:var(--shadow-soft)}
.auth h2{font-size:30px;letter-spacing:-.04em;margin:0}
.auth .desc{margin:8px 0 28px;font-size:14.5px}
.field{margin-bottom:16px}
.field label{display:block;font-size:13.5px;font-weight:700;margin-bottom:7px;color:var(--ink-2)}
.input,textarea.input,select.input{width:100%;border:1px solid var(--line-2);border-radius:12px;padding:13px 14px;background:#fff;outline:none;transition:.15s;font-size:15px}
.input:focus{border-color:var(--blue);box-shadow:0 0 0 4px rgba(21,145,214,.14)}
textarea.input{min-height:160px;resize:vertical;line-height:1.7}
.auth .btn{width:100%;justify-content:center}
.or{display:flex;align-items:center;gap:12px;color:var(--muted);font-size:13px;margin:18px 0}
.or::before,.or::after{content:"";flex:1;height:1px;background:var(--line)}
.auth-foot{text-align:center;margin-top:22px;font-size:14px;color:var(--muted)}
.auth-foot a{color:var(--blue-deep);font-weight:700;cursor:pointer}

/* ---------- CTA / footer ---------- */
.cta{background:var(--blue);color:#fff;border-radius:28px;padding:64px;display:flex;justify-content:space-between;align-items:center;gap:32px;position:relative;overflow:hidden}
.cta h3{font-size:clamp(28px,3.4vw,42px);letter-spacing:-.04em;line-height:1.2;margin:0;font-weight:800}
.cta p{margin:10px 0 0;color:#d9eefb}
.cta .btn{background:#fff;color:var(--ink);flex-shrink:0}
.cta .btn:hover{background:var(--ink);color:#fff}
.cta::after{content:"";position:absolute;right:-60px;top:-40px;width:260px;height:340px;background:rgba(255,255,255,.08);transform:skewX(-38deg)}
footer{border-top:1px solid var(--line);background:#fff;padding:48px 0;margin-top:0}
.foot{display:flex;justify-content:space-between;gap:32px;align-items:flex-start}
.foot img{height:30px}
.foot p{margin:14px 0 0;color:var(--muted);font-size:13.5px}
.foot-links{display:flex;flex-wrap:wrap;gap:10px}
.foot-links a{border:1px solid var(--line-2);border-radius:999px;padding:8px 16px;font-size:13.5px;font-weight:600}
.foot-links a:hover{border-color:var(--ink)}
.copy{margin-top:32px;padding-top:20px;border-top:1px solid var(--line);font-size:12.5px;color:#98a2b3}


.post-meta{color:var(--muted);font-size:13.5px;padding-bottom:18px;border-bottom:1px solid var(--line)}
.post-body{padding:22px 0;white-space:pre-line}
.answer{background:var(--blue-soft);border-radius:var(--radius-md);padding:18px 20px}
.answer b{color:var(--blue-deep);font-size:13px;letter-spacing:.06em}
.answer p{margin:6px 0 0}
.row{display:flex;gap:10px;justify-content:flex-end;margin-top:8px}
.seg{display:flex;gap:8px}
.seg label{flex:1;border:1px solid var(--line-2);border-radius:12px;padding:11px;text-align:center;font-weight:600;font-size:14px;cursor:pointer}
.seg input{display:none}
.seg input:checked+span{color:var(--blue-deep)}
.seg label:has(input:checked){border-color:var(--blue);background:var(--blue-soft)}



/* ---------- responsive ---------- */
@media (max-width:980px){
  .hero-grid,.method,.profile{grid-template-columns:1fr}
  .hero-note{left:16px}
  .features,.video-grid{grid-template-columns:1fr 1fr}
  .book-grid,.gallery{grid-template-columns:repeat(3,1fr)}
  .profile-photo{position:relative;top:0;max-width:380px}
  .method,.cta{padding:40px}
  .cta{flex-direction:column;align-items:flex-start}
}
@media (max-width:860px){
  .menu-btn{display:block}
  .nav{position:absolute;top:74px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;padding:12px 20px 20px;display:none}
  .nav.open{display:flex}
  .nav-sep{display:none}
  .topbar-inner{position:relative}
}
@media (max-width:640px){
  .block{padding:64px 0}
  .stats{grid-template-columns:1fr}
  .stat{border-right:0;border-bottom:1px solid var(--line)}
  .features,.video-grid{grid-template-columns:1fr}
  .video.feat{grid-column:auto;grid-row:auto}
  .book-grid,.gallery{grid-template-columns:1fr 1fr}
  .board-row{grid-template-columns:1fr;gap:6px}
  .board-row.head{display:none}
  .p-sec{grid-template-columns:1fr;gap:8px}
  .sec-head{flex-direction:column;align-items:flex-start}
  .hero-card{padding:28px}
  .foot{flex-direction:column}
}

/* ───────────────────────────────────────────
   답글(Reply) 영역
─────────────────────────────────────────── */
.reply-badge{display:inline-flex;align-items:center;gap:3px;font-size:11.5px;color:var(--blue-deep);background:var(--blue-soft);border-radius:20px;padding:1px 8px;margin-left:4px;font-weight:600}
.reply-section{margin-top:24px;border-top:1.5px solid var(--border);padding-top:18px}
.reply-title{font-size:14px;font-weight:700;color:var(--ink-1);margin-bottom:12px;display:flex;align-items:center;gap:6px}
.reply-count{background:var(--blue-deep);color:#fff;border-radius:20px;font-size:11px;padding:1px 7px;font-weight:700}
.reply-list{display:flex;flex-direction:column;gap:10px;margin-bottom:14px}
.reply-item{background:var(--bg-2,#f7f8fa);border-radius:10px;padding:12px 14px;position:relative}
.reply-header{display:flex;align-items:center;gap:8px;margin-bottom:5px}
.reply-author{font-size:13px;font-weight:700;color:var(--ink-1);display:flex;align-items:center;gap:5px}
.reply-admin-badge{background:var(--blue-deep);color:#fff;font-size:10.5px;font-weight:700;padding:1px 7px;border-radius:20px;letter-spacing:.03em}
.reply-date{font-size:11.5px;color:var(--ink-3,#aaa);margin-left:auto}
.reply-del{background:none;border:none;cursor:pointer;color:var(--ink-3,#bbb);font-size:13px;padding:2px 5px;border-radius:4px;line-height:1;flex-shrink:0}
.reply-del:hover{color:var(--error,#e55);background:var(--error-soft,#fff0f0)}
.reply-body{font-size:14px;color:var(--ink-1);white-space:pre-wrap;line-height:1.6}
.reply-empty{text-align:center;color:var(--ink-3,#bbb);font-size:13px;padding:14px 0}
.reply-form{display:flex;flex-direction:column;gap:8px}
.reply-input{width:100%;box-sizing:border-box;resize:vertical;min-height:60px;font-size:14px}
.reply-submit{align-self:flex-end}
.reply-login-hint{font-size:13px;color:var(--ink-3,#aaa);text-align:center;padding:10px 0}
.reply-login-link{color:var(--blue-deep);font-weight:600;text-decoration:underline;cursor:pointer}