/* ============================================================
   CoreNine AI — v4.1 Design System
   화이트 + 에메랄드(브랜드) + 라임(스파크) + 딥 포레스트(다크 섹션)
   ============================================================ */
@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/variable/pretendardvariable-dynamic-subset.min.css');

:root{
  /* brand */
  --brand:#0BA678;
  --brand-strong:#047857;
  --brand-ink:#064E3B;
  --brand-soft:#E4F7EF;
  --brand-softer:#F1FBF6;
  --brand-line:#B8E9D6;
  --lime:#C9F24E;           /* 스파크 — 다크 위 하이라이트 */
  --lime-soft:#F4FCDD;
  /* dark surfaces */
  --forest:#07231B;
  --forest-2:#0B2E24;
  --forest-line:rgba(255,255,255,.1);
  --forest-sub:#9DB8AC;
  /* neutrals */
  --ink:#0D1B2A;
  --sub:#46566A;
  --mute:#8593A6;
  --line:#E4E9F0;
  --bg:#FFFFFF;
  --bg-soft:#F6F9FB;
  --card:#FFFFFF;
  /* misc */
  --radius:18px;
  --shadow-sm:0 2px 10px rgba(13,27,42,.05);
  --shadow-md:0 12px 36px rgba(13,27,42,.1);
  --shadow-lg:0 28px 70px rgba(13,27,42,.16);
  --grad-brand:linear-gradient(120deg,#047857 0%,#0BB985 100%);
  --sans:'Pretendard Variable',Pretendard,-apple-system,BlinkMacSystemFont,'Segoe UI','Malgun Gothic',sans-serif;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);color:var(--ink);background:var(--bg);
  line-height:1.7;font-size:16px;letter-spacing:-.01em;
  word-break:keep-all;overflow-wrap:break-word;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit}
button{font-family:var(--sans)}
::selection{background:var(--brand);color:#fff}

.wrap{max-width:1160px;margin:0 auto;padding:0 24px}

/* ---------------- scroll progress ---------------- */
.scroll-bar{position:fixed;top:0;left:0;height:3px;width:0;z-index:120;
  background:linear-gradient(90deg,#047857,#0BB985 60%,var(--lime))}

/* ---------------- nav ---------------- */
nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.88);
  backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:70px;gap:20px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.logo-mark{width:33px;height:33px;flex:none}
.brand .name{font-size:20px;font-weight:500;letter-spacing:-.045em;color:var(--ink)}
.brand .name b{font-weight:800}
.brand .name em{font-style:normal;font-weight:800;color:var(--brand);margin-left:5px}
.nav-links{display:flex;align-items:center;gap:28px}
.nav-links a{font-size:14.5px;font-weight:600;color:var(--sub);text-decoration:none;
  transition:color .15s;position:relative;padding:4px 0}
.nav-links a:not(.cta)::after{content:"";position:absolute;left:0;right:100%;bottom:-2px;height:2px;
  background:var(--brand);transition:right .2s ease}
.nav-links a:not(.cta):hover::after,.nav-links a.active::after{right:0}
.nav-links a:hover{color:var(--ink)}
.nav-new{display:inline-block;margin-left:5px;font-size:10px;font-weight:800;letter-spacing:.04em;
  background:var(--lime);color:var(--forest);border-radius:5px;padding:2px 6px;vertical-align:2px}
.nav-links a.active{color:var(--brand-strong);font-weight:800}
.nav-links a.cta{
  background:var(--grad-brand);color:#fff;font-weight:800;padding:11px 22px;border-radius:11px;
  box-shadow:0 6px 18px rgba(4,120,87,.25);transition:transform .15s,box-shadow .15s;
}
.nav-links a.cta:hover{color:#fff;transform:translateY(-1.5px);box-shadow:0 10px 24px rgba(4,120,87,.32)}
.nav-burger{display:none;background:none;border:none;cursor:pointer;padding:8px}
.nav-burger span{display:block;width:22px;height:2.5px;background:var(--ink);border-radius:2px;margin:4.5px 0;transition:.25s}
.nav-burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-burger.open span:nth-child(2){opacity:0}
.nav-burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---- nav dropdown (자동화 구축 > 철강 유통) ---- */
.nav-item{position:relative;display:flex;align-items:center}
.nav-item > a{display:inline-flex;align-items:center;gap:6px}
.nav-item .caret{width:9px;height:6px;opacity:.55;transition:transform .2s}
.nav-item:hover .caret{transform:rotate(180deg)}
.nav-sub{position:absolute;top:100%;left:50%;transform:translate(-50%,10px);min-width:250px;
  background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow-md);
  padding:8px;opacity:0;visibility:hidden;transition:opacity .18s ease,transform .18s ease,visibility .18s}
.nav-sub::before{content:"";position:absolute;left:0;right:0;top:-14px;height:14px}
.nav-item:hover .nav-sub,.nav-item:focus-within .nav-sub{opacity:1;visibility:visible;transform:translate(-50%,6px)}
.nav-sub a{display:block;padding:11px 14px;border-radius:10px}
.nav-sub a:hover{background:var(--brand-softer)}
.nav-sub a::after{display:none}
.nav-sub .ns-l{display:block;font-size:14px;font-weight:700;color:var(--ink)}
.nav-sub a.active .ns-l{color:var(--brand-strong)}
.nav-sub .ns-d{display:block;margin-top:2px;font-size:12px;font-weight:500;color:var(--mute)}

/* ---------------- buttons ---------------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-weight:800;font-size:15.5px;text-decoration:none;cursor:pointer;
  padding:16px 32px;border-radius:13px;border:none;transition:all .18s ease;letter-spacing:-.01em}
.btn.primary{background:var(--grad-brand);color:#fff;box-shadow:0 10px 28px rgba(4,120,87,.3)}
.btn.primary:hover{transform:translateY(-2px);box-shadow:0 16px 36px rgba(4,120,87,.38);filter:brightness(1.06)}
.btn.ghost{background:#fff;color:var(--ink);border:1.5px solid #CBD5E1}
.btn.ghost:hover{border-color:var(--ink);transform:translateY(-2px)}
.btn.soft{background:var(--brand-soft);color:var(--brand-strong)}
.btn.soft:hover{background:var(--brand-line)}
.btn.lime{background:var(--lime);color:var(--forest);box-shadow:0 10px 28px rgba(201,242,78,.35)}
.btn.lime:hover{transform:translateY(-2px);filter:brightness(1.04)}
.btn.sm{padding:11px 21px;font-size:14px;border-radius:11px}
.btn .arr{transition:transform .18s ease;font-weight:800}
.btn:hover .arr{transform:translateX(4px)}

/* ---------------- sections / headings ---------------- */
section{padding:104px 0}
section.tight{padding:76px 0}
.sec-soft{background:var(--bg-soft)}
.sec-mint{background:linear-gradient(180deg,var(--brand-softer) 0%,#fff 100%)}
.sec-forest{background:
  radial-gradient(900px 500px at 85% -10%,rgba(11,185,133,.2) 0%,transparent 55%),
  linear-gradient(150deg,var(--forest) 0%,var(--forest-2) 100%);
  color:#fff}
.sec-forest .title{color:#fff}
.sec-forest .title .accent{color:var(--lime)}
.sec-forest .title-desc{color:var(--forest-sub)}
.sec-forest .eyebrow{background:rgba(201,242,78,.1);border-color:rgba(201,242,78,.3);color:var(--lime)}
.sec-forest .eyebrow::before{background:var(--lime)}

.eyebrow{display:inline-flex;align-items:center;gap:8px;
  font-size:12.5px;font-weight:800;letter-spacing:.09em;color:var(--brand-strong);
  background:var(--brand-soft);border:1px solid var(--brand-line);
  padding:8px 16px;border-radius:999px;margin-bottom:22px;text-transform:uppercase}
.eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--brand)}
h2.title{font-size:clamp(28px,4vw,44px);font-weight:800;letter-spacing:-.035em;line-height:1.38}
h2.title .accent{color:var(--brand-strong);position:relative;z-index:0}
h2.title .accent::after{content:"";position:absolute;left:0;right:0;bottom:2px;height:.34em;
  background:var(--lime);opacity:.5;z-index:-1;border-radius:3px}
.sec-forest h2.title .accent::after{opacity:.22}
.title-desc{margin-top:20px;color:var(--sub);font-size:16.5px;max-width:660px;line-height:1.85}
.center{text-align:center}
.center .title-desc{margin-left:auto;margin-right:auto}

/* ---------------- generic card ---------------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow-sm);transition:transform .2s ease,box-shadow .2s ease}
.card.hover:hover{transform:translateY(-5px);box-shadow:var(--shadow-md)}

/* ---------------- chips / badges ---------------- */
.chip{display:inline-block;font-size:12.5px;font-weight:700;padding:5px 13px;border-radius:999px;
  background:var(--bg-soft);border:1px solid var(--line);color:var(--sub)}
.chip.mint{background:var(--brand-soft);border-color:var(--brand-line);color:var(--brand-strong)}
.chip.lime{background:var(--lime-soft);border-color:#DDF0A5;color:#5A7211}
.badge-level{display:inline-block;font-size:12px;font-weight:800;padding:4px 12px;border-radius:8px}
.badge-level.l1{background:#EAF3FF;color:#1D6FD6}
.badge-level.l2{background:var(--brand-soft);color:var(--brand-strong)}
.badge-level.l3{background:#F3EDFF;color:#6D3FD1}

/* ---------------- doc table ---------------- */
table.doc{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);
  border-radius:16px;overflow:hidden;font-size:14.5px;box-shadow:var(--shadow-sm)}
table.doc th{background:var(--forest);color:#fff;text-align:left;font-size:13px;
  letter-spacing:.04em;padding:14px 18px;font-weight:700}
table.doc td{padding:16px 18px;border-top:1px solid var(--line);vertical-align:top;line-height:1.7}
table.doc tr.hl td{background:var(--brand-softer)}
table.doc .t-strong{font-weight:800}
table.doc .t-time{font-weight:700;color:var(--brand-strong);white-space:nowrap}
.table-scroll{overflow-x:auto}

/* ---------------- stats ---------------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.stat{position:relative;background:#fff;border:1px solid var(--line);border-radius:18px;
  padding:30px 26px;box-shadow:var(--shadow-sm);overflow:hidden;
  transition:transform .2s,box-shadow .2s}
.stat::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:var(--grad-brand)}
.stat:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.stat .n{font-size:42px;font-weight:800;letter-spacing:-.04em;color:var(--ink);line-height:1.1}
.stat .n em{font-style:normal;background:var(--grad-brand);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.stat .l{margin-top:12px;font-size:14px;color:var(--sub);line-height:1.7;font-weight:600}
.stat .src{margin-top:12px;font-size:11.5px;color:var(--mute)}

/* ---------------- FAQ ---------------- */
.faq-list{margin-top:48px;max-width:840px}
.faq-item{border:1px solid var(--line);border-radius:16px;background:#fff;margin-bottom:12px;
  overflow:hidden;transition:border-color .2s,box-shadow .2s}
.faq-item[open]{border-color:var(--brand-line);box-shadow:var(--shadow-sm)}
.faq-item summary{cursor:pointer;list-style:none;padding:22px 26px;font-weight:800;font-size:16px;
  display:flex;justify-content:space-between;align-items:center;gap:16px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";flex:none;width:28px;height:28px;border-radius:9px;
  background:var(--brand-soft);color:var(--brand-strong);display:flex;align-items:center;
  justify-content:center;font-size:19px;font-weight:600;transition:transform .2s}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item .ans{padding:0 26px 24px;color:var(--sub);font-size:14.5px;line-height:1.9}

/* ---------------- footer ---------------- */
footer{background:var(--forest);color:var(--forest-sub);padding:72px 0 44px;font-size:14px;
  position:relative;overflow:hidden}
footer::before{content:"";position:absolute;right:-140px;bottom:-180px;width:460px;height:460px;
  border-radius:50%;border:60px solid rgba(11,185,133,.08)}
footer a{color:var(--forest-sub);text-decoration:none;transition:color .15s}
footer a:hover{color:#fff}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:36px;position:relative}
.foot-grid .brand .name{color:#fff}
.foot-grid .brand .name em{color:var(--lime)}
.foot-head{color:#fff;font-weight:800;margin-bottom:12px}
.foot-contact{margin-top:22px;display:flex;flex-direction:column;gap:8px;font-size:14px}
.foot-contact a{display:inline-flex;align-items:center;gap:10px;font-weight:700;color:#CFE3D9;width:max-content}
.foot-contact a:hover{color:var(--lime)}
.foot-contact .fc-k{font-size:10px;font-weight:800;letter-spacing:.14em;color:var(--lime);
  background:rgba(201,242,78,.1);border:1px solid rgba(201,242,78,.25);border-radius:6px;padding:2.5px 8px}
.foot-note{margin-top:56px;padding-top:26px;position:relative;
  font-size:12.5px;color:#6E8A7D;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:14px}
.foot-note::before{content:"";position:absolute;top:0;left:24px;right:24px;height:1px;
  background:linear-gradient(90deg,rgba(11,185,133,.45),var(--forest-line) 40%,var(--forest-line) 75%,rgba(201,242,78,.3))}
.fn-left,.fn-right{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.fn-mark{font-size:13.5px;font-weight:500;letter-spacing:-.03em;color:#B9CFC5}
.fn-mark b{font-weight:800;color:#fff}
.fn-mark em{font-style:normal;font-weight:800;color:var(--lime)}
.fn-sep{width:1px;height:12px;background:var(--forest-line)}
.fn-ceo{font-weight:700;color:#93AFA2}
.fn-right a{font-weight:700;color:#93AFA2}
.fn-right a:hover{color:var(--lime)}
.fn-top{margin-left:6px;background:rgba(255,255,255,.05);border:1px solid var(--forest-line);color:#B9CFC5;
  font-size:11px;font-weight:800;letter-spacing:.08em;padding:8px 14px;border-radius:999px;cursor:pointer;
  transition:all .18s}
.fn-top:hover{background:var(--lime);border-color:var(--lime);color:var(--forest);transform:translateY(-2px)}

/* ---------------- reveal animations ---------------- */
.reveal,.reveal-l,.reveal-r{opacity:0;transform:translateY(28px);transition:opacity .75s ease,transform .75s ease}
.reveal-l{transform:translateX(-34px)}
.reveal-r{transform:translateX(34px)}
.reveal.on,.reveal-l.on,.reveal-r.on{opacity:1;transform:none}
.stagger>*{opacity:0;transform:translateY(26px);transition:opacity .65s ease,transform .65s ease}
.stagger.on>*{opacity:1;transform:none}
.stagger.on>*:nth-child(1){transition-delay:.02s}
.stagger.on>*:nth-child(2){transition-delay:.1s}
.stagger.on>*:nth-child(3){transition-delay:.18s}
.stagger.on>*:nth-child(4){transition-delay:.26s}
.stagger.on>*:nth-child(5){transition-delay:.34s}
.stagger.on>*:nth-child(6){transition-delay:.42s}
.stagger.on>*:nth-child(7){transition-delay:.5s}
.stagger.on>*:nth-child(8){transition-delay:.58s}
@media (prefers-reduced-motion:reduce){
  .reveal,.reveal-l,.reveal-r,.stagger>*{opacity:1;transform:none;transition:none}
}

/* ---------------- marquee ---------------- */
.marquee{overflow:hidden;border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  padding:18px 0;background:#fff}
.marquee .track{display:flex;gap:12px;width:max-content;animation:marq 36s linear infinite}
.marquee .chip{white-space:nowrap;font-size:13.5px;padding:9px 20px}
.marquee .chip b{color:var(--brand-strong)}
@keyframes marq{from{transform:translateX(0)}to{transform:translateX(-50%)}}

/* ---------------- page hero ---------------- */
.page-hero{position:relative;padding:92px 0 78px;overflow:hidden;
  background:
    radial-gradient(760px 420px at 88% -20%,rgba(11,185,133,.16) 0%,transparent 60%),
    radial-gradient(540px 320px at -6% 110%,rgba(201,242,78,.14) 0%,transparent 55%),
    linear-gradient(180deg,var(--brand-softer) 0%,#fff 100%)}
.page-hero::after{content:"";position:absolute;top:-90px;right:-90px;width:340px;height:340px;
  border-radius:50%;border:44px solid rgba(11,166,120,.07);pointer-events:none}
.page-hero h1{font-size:clamp(32px,4.5vw,52px);font-weight:800;letter-spacing:-.035em;line-height:1.36;position:relative}
.page-hero h1 .accent{color:var(--brand-strong);position:relative;z-index:0}
.page-hero h1 .accent::after{content:"";position:absolute;left:0;right:0;bottom:3px;height:.32em;
  background:var(--lime);opacity:.5;z-index:-1;border-radius:3px}
.page-hero .lede{margin-top:22px;color:var(--sub);font-size:17px;max-width:620px;line-height:1.85;position:relative}
.page-hero .lede b{color:var(--ink)}
.crumb{position:relative;font-size:13px;font-weight:700;color:var(--mute);margin-bottom:18px}
.crumb a{color:var(--mute);text-decoration:none}
.crumb a:hover{color:var(--brand-strong)}

/* ---------------- CTA band ---------------- */
.cta-band{background:
  radial-gradient(ellipse at 50% 135%,rgba(11,185,133,.4) 0%,transparent 58%),
  linear-gradient(140deg,var(--forest) 0%,var(--forest-2) 100%);
  color:#fff;text-align:center;padding:112px 0;position:relative;overflow:hidden}
.cta-band::before{content:"";position:absolute;left:-120px;top:-160px;width:380px;height:380px;
  border-radius:50%;border:52px solid rgba(201,242,78,.06)}
.cta-band::after{content:"";position:absolute;right:-100px;bottom:-190px;width:420px;height:420px;
  border-radius:50%;border:60px solid rgba(11,185,133,.1)}
.cta-band h2{font-size:clamp(27px,4vw,44px);font-weight:800;letter-spacing:-.035em;line-height:1.42;position:relative;z-index:1}
.cta-band h2 em{font-style:normal;color:var(--lime)}
.cta-band p{margin:20px auto 40px;color:var(--forest-sub);font-size:16.5px;max-width:580px;position:relative;line-height:1.85;z-index:1}
.cta-band .btn{position:relative;z-index:1}

/* ---------------- 반응형 ---------------- */
@media (max-width:960px){
  section{padding:72px 0}
  .stats{grid-template-columns:1fr 1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .nav-links{
    display:none;position:absolute;top:70px;left:0;right:0;background:#fff;
    flex-direction:column;align-items:stretch;gap:0;border-bottom:1px solid var(--line);
    padding:8px 0 16px;box-shadow:var(--shadow-md);max-height:calc(100vh - 70px);overflow-y:auto;
  }
  .nav-links.open{display:flex}
  .nav-links a{padding:13px 24px;font-size:15.5px}
  .nav-links a:not(.cta)::after{display:none}
  .nav-links a.cta{margin:10px 24px 0;text-align:center;justify-content:center;display:flex}
  .nav-burger{display:block}
  /* 모바일: 드롭다운을 펼친 목록으로 */
  .nav-item{flex-direction:column;align-items:stretch}
  .nav-item .caret{display:none}
  .nav-sub{position:static;transform:none;opacity:1;visibility:visible;min-width:0;
    border:none;box-shadow:none;border-radius:0;padding:0 0 4px;background:var(--bg-soft)}
  .nav-sub::before{display:none}
  .nav-sub a{padding:11px 24px 11px 38px;border-radius:0}
  .nav-sub .ns-l{font-size:14.5px}
}
@media (max-width:560px){
  body{font-size:15px}
  .wrap{padding:0 20px}
  section{padding:60px 0}
  section.tight{padding:52px 0}
  .nav-in{height:62px}
  .nav-links{top:62px;max-height:calc(100vh - 62px)}
  .brand .name{font-size:18px}
  .logo-mark{width:29px;height:29px}
  .page-hero{padding:56px 0 52px}
  .page-hero .lede{font-size:15.5px}
  .page-hero h1{font-size:clamp(27px,7.6vw,34px)}
  h2.title{font-size:clamp(24px,6.6vw,30px)}
  .title-desc{font-size:15px;margin-top:16px}
  .eyebrow{font-size:11.5px;padding:7px 14px;margin-bottom:18px}
  .btn{padding:14px 24px;font-size:14.5px;width:100%;max-width:420px}
  .btn.sm{width:auto}
  .stats{grid-template-columns:1fr;gap:14px}
  .stat{padding:24px 22px}
  .stat .n{font-size:34px}
  .cta-band{padding:80px 0}
  .faq-item summary{padding:18px 20px;font-size:15px}
  .faq-item .ans{padding:0 20px 20px}
  table.doc{font-size:13.5px}
  table.doc th{padding:11px 14px}
  table.doc td{padding:13px 14px}
  .marquee .chip{font-size:12.5px;padding:8px 16px}
  .foot-grid{grid-template-columns:1fr;gap:28px}
  footer{padding:56px 0 36px}
  .foot-note{flex-direction:column;align-items:flex-start;gap:12px}
  .foot-note::before{left:20px;right:20px}
}