:root{
  --ink:#162024;
  --muted:#607178;
  --soft:#EEF5F3;
  --paper:#FFFCF5;
  --surface:#FFFFFF;
  --line:#D9E5E2;
  --brand:#395B64;
  --brand-dark:#263F46;
  --accent:#A66C3A;
  --accent-dark:#7A4A25;
  --mint:#B8D8D8;
  --danger:#C2412D;
  --shadow:0 18px 45px rgba(38,63,70,.12);
  --shadow-soft:0 10px 28px rgba(38,63,70,.09);
  --radius:8px;
  --maxw:1120px;
  --ease:cubic-bezier(.16,1,.3,1);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:'Pretendard',system-ui,-apple-system,'Segoe UI',sans-serif;
  color:var(--ink);
  background:var(--paper);
  line-height:1.65;
  word-break:keep-all;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 20px}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:48px;
  padding:13px 22px;
  border:0;
  border-radius:var(--radius);
  font-weight:800;
  font-size:15px;
  cursor:pointer;
  transition:transform .16s var(--ease),background .16s var(--ease),border-color .16s var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 10px 24px rgba(57,91,100,.24)}
.btn-primary:hover{background:var(--brand-dark)}
.btn-ghost{background:#fff;color:var(--brand-dark);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--brand)}
.full{width:100%}

.nav{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(255,252,245,.9);
  border-bottom:1px solid rgba(217,229,226,.85);
  backdrop-filter:blur(14px);
}
.nav-in{height:64px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:900;letter-spacing:-.02em;color:var(--brand-dark)}
.brand-mark{
  width:32px;
  height:32px;
  display:grid;
  place-items:center;
  border-radius:8px;
  background:var(--brand);
  color:#fff;
  font-weight:900;
}
.nav-links{display:none;align-items:center;gap:20px;color:var(--muted);font-size:14px;font-weight:700}
.nav-links a:hover{color:var(--brand-dark)}
.nav-cta{display:inline-flex;align-items:center;justify-content:center;padding:10px 15px;border-radius:var(--radius);background:var(--brand);color:#fff;font-size:14px;font-weight:800}
.nav-cta.ghost{background:transparent;color:var(--brand);border:1px solid var(--line)}

.hero{
  position:relative;
  overflow:hidden;
  padding:52px 0 58px;
  background:
    linear-gradient(135deg,rgba(184,216,216,.5),transparent 38%),
    radial-gradient(circle at 88% 18%,rgba(166,108,58,.18),transparent 28%),
    var(--paper);
}
.hero::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:linear-gradient(rgba(57,91,100,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(57,91,100,.05) 1px,transparent 1px);
  background-size:32px 32px;
  mask-image:linear-gradient(to bottom,#000,transparent 88%);
}
.hero-grid{position:relative;display:grid;gap:34px;align-items:center}
.eyebrow,.section-label{
  display:inline-flex;
  width:max-content;
  max-width:100%;
  color:var(--accent-dark);
  background:#F2E2D2;
  border:1px solid #E5CDB6;
  border-radius:999px;
  padding:6px 12px;
  font-size:13px;
  font-weight:900;
}
.hero h1{
  margin:16px 0 0;
  max-width:720px;
  font-size:clamp(32px,7vw,58px);
  line-height:1.12;
  letter-spacing:-.045em;
}
.hero h1 strong{color:var(--brand)}
.hero-sub{max-width:600px;margin:18px 0 0;color:var(--muted);font-size:17px}
.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}

.bench{
  position:relative;
  min-height:390px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(160deg,#fff,rgba(238,245,243,.8));
  box-shadow:var(--shadow);
  padding:26px;
}
.bench::after{
  content:"";
  position:absolute;
  left:24px;
  right:24px;
  bottom:24px;
  height:8px;
  border-radius:999px;
  background:linear-gradient(90deg,var(--danger),var(--accent),var(--brand));
  opacity:.7;
}
.paper{
  position:absolute;
  left:26px;
  right:26px;
  min-height:124px;
  padding:18px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:#fff;
  box-shadow:var(--shadow-soft);
}
.paper-fail{top:30px;transform:rotate(-2deg)}
.paper-fix{top:138px;transform:rotate(1.5deg);background:#FAF3EA}
.paper-retry{top:248px;transform:rotate(-.8deg);background:#EEF5F3}
.paper-kicker{display:block;margin-bottom:6px;color:var(--muted);font-size:12px;font-weight:900;letter-spacing:.08em}
.paper b{display:block;font-size:19px;color:var(--brand-dark)}
.paper p{margin:5px 0 0;color:var(--muted);font-size:14px}

.section{padding:68px 0}
.section-head{max-width:780px;margin:0 auto 28px;text-align:center}
.section-head.narrow{max-width:660px}
.section-head h2{
  margin:12px 0 0;
  font-size:clamp(25px,4.8vw,38px);
  line-height:1.24;
  letter-spacing:-.035em;
}
.section-head p:not(.section-label){margin:12px auto 0;color:var(--muted)}

.problem-band{background:#fff}
.fault-board{
  display:grid;
  grid-template-columns:1fr;
  gap:14px;
}
.fault-board article{
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(180deg,#fff,#F9FCFB);
  padding:22px;
  box-shadow:var(--shadow-soft);
}
.fault-board span{
  display:inline-flex;
  margin-bottom:12px;
  color:var(--danger);
  border-bottom:2px solid rgba(194,65,45,.25);
  font-size:13px;
  font-weight:900;
}
.fault-board h3{margin:0;font-size:20px;line-height:1.35}
.fault-board p{margin:10px 0 0;color:var(--muted)}

.repair-section{background:var(--soft)}
.layer-stack{
  max-width:840px;
  margin:34px auto 0;
  display:grid;
  gap:12px;
}
.layer-card{
  position:relative;
  display:grid;
  gap:7px;
  border:1px solid var(--line);
  border-left:8px solid var(--brand);
  border-radius:var(--radius);
  background:#fff;
  padding:20px;
  box-shadow:var(--shadow-soft);
}
.layer-card:nth-child(2){border-left-color:var(--accent)}
.layer-card:nth-child(3){border-left-color:#7F9C96}
.layer-card:nth-child(4){border-left-color:var(--brand-dark)}
.layer-name{color:var(--brand);font-size:13px;font-weight:900}
.layer-card h3{margin:0;font-size:21px;line-height:1.35}
.layer-card p{margin:0;color:var(--muted)}

.diagnosis-panel{
  padding:34px 0;
  color:#fff;
  background:linear-gradient(135deg,var(--brand-dark),var(--brand));
}
.diagnosis-grid{display:grid;gap:22px;align-items:center}
.diagnosis-panel .section-label{background:rgba(255,255,255,.13);border-color:rgba(255,255,255,.18);color:#fff}
.diagnosis-panel h2{margin:12px 0 8px;font-size:clamp(24px,4.6vw,36px);line-height:1.26;letter-spacing:-.035em}
.diagnosis-panel p{margin:0;color:#DDE9E6}
.diagnosis-panel .btn-primary{background:#fff;color:var(--brand-dark);box-shadow:none}

.use-section{background:var(--paper)}
.material-grid{display:grid;grid-template-columns:1fr;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.material-cell{background:#fff;padding:22px}
.material-cell b{display:block;font-size:18px;color:var(--brand-dark)}
.material-cell p{margin:8px 0 0;color:var(--muted)}

.faq-section{background:#fff}
.faq{max-width:800px;margin:0 auto;display:grid;gap:10px}
.faq-item{border:1px solid var(--line);border-radius:var(--radius);background:#fff;overflow:hidden}
.faq-q{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:18px 20px;
  border:0;
  background:transparent;
  color:var(--ink);
  text-align:left;
  font-size:17px;
  font-weight:900;
  cursor:pointer;
}
.faq-q span{flex:none;color:var(--accent);font-size:24px;line-height:1}
.faq-a{
  max-height:0;
  overflow:hidden;
  padding:0 20px;
  color:var(--muted);
  transition:max-height .25s var(--ease),padding .25s var(--ease);
}
.faq-item.open .faq-a{max-height:260px;padding:0 20px 18px}

.final-cta{
  text-align:center;
  padding:64px 0;
  background:linear-gradient(180deg,var(--soft),#fff);
}
.final-cta h2{max-width:740px;margin:0 auto;font-size:clamp(26px,5vw,42px);line-height:1.22;letter-spacing:-.035em}
.final-cta p{margin:14px auto 24px;color:var(--muted)}

.foot{padding:34px 0 88px;background:#162024;color:#B7C5C1;text-align:center}
.foot-brand{margin:0 0 8px;color:#fff;font-weight:900}
.foot p{margin:0 auto 10px;max-width:760px;font-size:14px}
.foot small{color:#82928E}

.float-cta{
  display:none;
  position:fixed;
  right:20px;
  bottom:20px;
  z-index:60;
  align-items:center;
  justify-content:center;
  padding:15px 20px;
  border-radius:var(--radius);
  background:var(--accent);
  color:#fff;
  font-weight:900;
  box-shadow:0 16px 34px rgba(122,74,37,.28);
}
.mbar{
  position:fixed;
  left:0;
  right:0;
  bottom:0;
  z-index:60;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:10px 14px calc(10px + env(safe-area-inset-bottom));
  border-top:1px solid var(--line);
  background:rgba(255,255,255,.96);
  box-shadow:0 -8px 28px rgba(22,32,36,.12);
}
.mbar span{font-size:14px;font-weight:900;color:var(--brand-dark)}
.mbar .btn{min-height:42px;padding:10px 16px}

.diag-body{background:linear-gradient(180deg,var(--soft),var(--paper))}
.diag-wrap{width:100%;max-width:590px;margin:0 auto;padding:28px 16px 88px}
.diag-card{
  min-height:60vh;
  display:flex;
  flex-direction:column;
  padding:26px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:#fff;
  box-shadow:var(--shadow);
}
.hidden{display:none!important}
.steps{display:flex;justify-content:center;gap:8px;margin-bottom:24px}
.dot{
  width:28px;
  height:28px;
  display:grid;
  place-items:center;
  border-radius:999px;
  background:var(--soft);
  color:var(--muted);
  font-size:13px;
  font-weight:900;
}
.dot.on{background:var(--brand);color:#fff}
.diag-loading{text-align:center;color:var(--muted);padding:44px 0}
.q-title{margin:0 0 8px;font-size:24px;line-height:1.35;letter-spacing:-.025em;color:var(--ink)}
.q-title.accent{color:var(--brand)}
.q-sub{margin:0 0 18px;color:var(--muted);font-size:14px}
.opts{display:flex;flex-direction:column;gap:10px;margin-top:18px}
.opt{
  display:flex;
  align-items:center;
  gap:12px;
  width:100%;
  min-height:56px;
  padding:15px 16px;
  border:2px solid var(--line);
  border-radius:var(--radius);
  background:#fff;
  color:var(--ink);
  text-align:left;
  font-weight:800;
  cursor:pointer;
  transition:border-color .16s var(--ease),background .16s var(--ease);
}
.opt i{
  flex:none;
  width:21px;
  height:21px;
  border:2px solid #B8C8C4;
  border-radius:999px;
  background:#fff;
}
.opt:hover{border-color:var(--brand)}
.opt.sel{border-color:var(--brand);background:var(--soft);color:var(--brand-dark)}
.opt.sel i{border-color:var(--brand);background:var(--brand);box-shadow:inset 0 0 0 4px #fff}
.field{
  width:100%;
  min-height:52px;
  margin-top:12px;
  padding:14px 15px;
  border:2px solid var(--line);
  border-radius:var(--radius);
  background:#fff;
  color:var(--ink);
}
.field:focus{outline:none;border-color:var(--brand)}
.agree{display:flex;align-items:flex-start;gap:9px;margin-top:14px;color:var(--muted);font-size:14px;cursor:pointer}
.agree input{width:18px;height:18px;margin-top:2px;accent-color:var(--brand)}
.err{min-height:20px;margin:9px 0 0;color:var(--danger);font-size:13px}
.result-box{
  margin:16px 0;
  padding:20px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--soft);
  color:var(--ink);
}
.result-box .amount{display:block;margin:6px 0;color:var(--brand);font-size:30px;font-weight:900;line-height:1.2}
.diag-nav{display:flex;gap:10px;margin-top:24px}
.diag-nav .btn{flex:1}
.diag-nav #btn_prev{flex:0 0 96px}
.done-box{text-align:center;margin:auto 0;padding:30px 0}
.done-box .check{
  width:70px;
  height:70px;
  display:grid;
  place-items:center;
  margin:0 auto 18px;
  border-radius:999px;
  background:var(--brand);
  color:#fff;
  font-size:36px;
  font-weight:900;
}
.done-box h2{margin:0 0 8px;font-size:23px}
.done-box p{margin:0 0 22px;color:var(--muted)}

@media (min-width:768px){
  .nav-links{display:flex}
  .hero{padding:82px 0 90px}
  .hero-grid{grid-template-columns:minmax(0,1.04fr) minmax(340px,.76fr)}
  .fault-board{grid-template-columns:repeat(3,1fr)}
  .layer-card{grid-template-columns:120px 1fr;align-items:start}
  .layer-card p{grid-column:2}
  .diagnosis-grid{grid-template-columns:1fr auto}
  .material-grid{grid-template-columns:repeat(4,1fr)}
  .foot{padding-bottom:38px}
  .float-cta{display:inline-flex}
  .mbar{display:none}
}

@media (max-width:420px){
  .brand span:last-child{font-size:15px}
  .nav-cta{padding:9px 10px}
  .bench{min-height:420px;padding:18px}
  .paper{left:18px;right:18px}
  .paper-fix{top:150px}
  .paper-retry{top:282px}
  .section{padding:54px 0}
}

/* ===== 게시판(목록/상세) ===== */
.page-head{background:linear-gradient(135deg,var(--soft),#fff);padding:38px 0 30px;text-align:center;border-bottom:1px solid var(--line)}
.page-head h1{font-size:clamp(26px,7vw,34px);font-weight:800;letter-spacing:-.02em;color:var(--brand-dark)}
.page-head p{color:var(--muted);margin-top:10px;font-size:15px}
.cat-bar{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:20px}
.cat-chip{font-size:13px;font-weight:700;color:var(--muted);background:#fff;border:1.5px solid var(--line);border-radius:999px;padding:8px 16px;cursor:pointer;transition:all .15s}
.cat-chip:hover,.cat-chip.on{color:#fff;background:var(--brand);border-color:var(--brand)}
.qna-list{max-width:680px;margin:32px auto;padding:0 20px;display:flex;flex-direction:column;gap:12px}
.qna-item{display:block;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow-soft);transition:transform .15s var(--ease),box-shadow .15s,border-color .15s}
.qna-item:not(.coming):hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--brand)}
.qna-item .qi-cat{display:inline-block;font-size:12px;font-weight:700;color:var(--brand);background:var(--soft);padding:5px 12px;border-radius:999px;margin-bottom:12px}
.qna-item .qi-q{font-size:17px;font-weight:800;line-height:1.45;color:var(--ink)}
.qna-item .qi-q b{color:var(--brand);margin-right:6px}
.qna-item .qi-ex{color:var(--muted);font-size:14px;margin-top:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.qna-item .qi-more{display:inline-block;margin-top:14px;color:var(--brand);font-size:14px;font-weight:700}
.qi-badge{float:right;font-size:11px;font-weight:700;color:#94A3B8;background:#EEF2F6;padding:4px 10px;border-radius:999px}
.qna-item.coming{opacity:.6;background:#F8FAFC}
.pager{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;align-items:center;margin:28px auto 56px;padding:0 20px;max-width:680px}
.pg{min-width:40px;height:40px;display:inline-flex;align-items:center;justify-content:center;padding:0 12px;border-radius:10px;border:1.5px solid var(--line);background:#fff;color:var(--muted);font-weight:700;font-size:14px;text-decoration:none}
.pg:hover{border-color:var(--brand)}
.pg.on{background:var(--brand);border-color:var(--brand);color:#fff}
.breadcrumb{max-width:680px;margin:18px auto 0;padding:0 20px;font-size:13px;color:var(--muted)}
.breadcrumb a:hover{color:var(--brand)}
.breadcrumb span{color:#CBD5E1;margin:0 6px}
.qna-detail{max-width:680px;margin:18px auto 0;padding:0 20px 60px}
.qd-cat{display:inline-block;font-size:12px;font-weight:700;color:var(--brand);background:var(--soft);padding:6px 14px;border-radius:999px;margin-bottom:14px}
.qd-q{font-size:clamp(22px,6vw,28px);font-weight:800;line-height:1.4;color:var(--brand-dark)}
.qd-meta{color:var(--muted);font-size:13px;margin-top:12px;padding-bottom:20px;border-bottom:1px solid var(--line)}
.qd-answer{font-size:16.5px;line-height:1.85;color:#2C3645;margin-top:24px}
.qd-answer h2{font-size:19px;font-weight:800;margin:28px 0 10px;color:var(--brand-dark)}
.qd-answer p{margin:14px 0}
.qd-answer strong{color:var(--brand-dark)}
.qd-note{background:#FFFBEB;border:1px solid #FDE68A;border-radius:12px;padding:16px 18px;font-size:13.5px;color:#92400E;margin-top:24px;line-height:1.6}
.qd-cta{background:linear-gradient(135deg,var(--brand),var(--brand-dark));border-radius:var(--radius);padding:28px 24px;text-align:center;margin-top:32px}
.qd-cta h3{color:#fff;font-size:20px;font-weight:800;margin-bottom:6px}
.qd-cta p{color:rgba(255,255,255,.85);font-size:14px;margin-bottom:18px}
.qd-cta .btn-primary{background:var(--accent);color:#fff}
.qd-related{margin-top:36px}
.qd-related h2{font-size:18px;font-weight:800;margin-bottom:14px;color:var(--brand-dark)}
.post-nav{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:28px 0 8px}
.post-nav .pn{display:flex;flex-direction:column;gap:4px;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:14px 16px}
.post-nav .pn:hover{border-color:var(--brand)}
.post-nav .pn.next{text-align:right}
.post-nav .pn span{font-size:12px;font-weight:700;color:var(--brand)}
.post-nav .pn b{font-size:14px;font-weight:700;color:var(--ink);display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;overflow:hidden}
.post-nav .pn.off{background:transparent;border:none}