/* Battery Materials R&D Portfolio — standalone CSS, no framework or external dependencies. */
:root{--ink:#192d2b;--ink-2:#304944;--muted:#667874;--green:#186f5c;--green-dark:#125241;--green-light:#e7f3ed;--line:#dce6e1;--surface:#fff;--bg:#f6f8f5;--wash:#eef3ee;--sand:#eee9df;--shadow:0 22px 60px rgba(31,67,52,.08);--radius:22px;--max:1160px;--ease:cubic-bezier(.21,.79,.27,1);font-synthesis:none}
*,*:before,*:after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:108px}
body{margin:0;background:var(--bg);color:var(--ink);font-family:'Noto Sans KR','Apple SD Gothic Neo','Malgun Gothic',system-ui,-apple-system,sans-serif;font-size:16px;line-height:1.72;-webkit-font-smoothing:antialiased;word-break:keep-all;overflow-wrap:break-word}
a{color:inherit;text-decoration:none}
button{font:inherit}
button,a{-webkit-tap-highlight-color:transparent}
button:focus-visible,a:focus-visible{outline:3px solid #75bda7;outline-offset:4px}
img{display:block;max-width:100%}
::selection{background:#b5e2d0;color:#103e31}
.skip-link{position:absolute;top:-100px;left:12px;z-index:200;background:var(--green);color:#fff;padding:10px 16px;border-radius:8px}.skip-link:focus{top:12px}
.container{width:min(var(--max),calc(100% - 96px));margin-inline:auto}
.section{padding:104px 0;scroll-margin-top:88px}
.section-tight{padding:78px 0}
.surface-section{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:38px}
.section-head h2,.detail-section h2{margin:10px 0 0;font-size:clamp(27px,3vw,37px);line-height:1.32;letter-spacing:-.055em;font-weight:800}
.section-head p{max-width:510px;color:var(--muted);font-size:14px;line-height:1.9;margin:0}
.eyebrow{display:inline-flex;align-items:center;gap:10px;letter-spacing:.13em;text-transform:uppercase;font-size:11px;font-weight:800;color:var(--green)}
.eyebrow:before{content:"";display:inline-block;width:19px;height:1px;background:currentColor}
.pretitle{display:block;font-size:12px;letter-spacing:.07em;color:var(--muted);font-weight:700}
.lead{font-size:clamp(17px,1.8vw,20px);line-height:1.85;color:var(--ink-2)}
.muted{color:var(--muted)}
.site-header{height:78px;position:sticky;top:0;z-index:100;background:rgba(250,252,249,.95);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);border-bottom:1px solid rgba(215,227,219,.95);transition:box-shadow .25s}
.site-header.scrolled{box-shadow:0 5px 22px rgba(25,58,46,.055)}
.header-inner{height:100%;display:flex;align-items:center;justify-content:space-between;gap:25px}
.logo{display:inline-flex;align-items:center;gap:11px;flex:none;font-size:16px;letter-spacing:-.04em;font-weight:850}
.logo-mark{height:38px;width:38px;display:grid;place-items:center;border-radius:11px;background:var(--ink);color:#fff;font-size:13px;font-weight:800;letter-spacing:-.09em}
.logo-text{display:flex;flex-direction:column;line-height:1.23}.logo-text small{color:var(--muted);font-size:10px;letter-spacing:.05em;font-weight:600;margin-top:4px}
.desktop-nav{display:flex;align-items:center;gap:28px;margin-left:auto}
.desktop-nav a{font-size:12px;color:#536763;font-weight:750;transition:color .2s;position:relative}
.desktop-nav a:hover,.desktop-nav a.is-active{color:var(--green)}
.desktop-nav a.is-active:after{content:'';position:absolute;left:0;right:0;bottom:-29px;height:2px;background:var(--green)}
.header-contact{flex:none;border:1px solid var(--green);border-radius:999px;padding:10px 17px;color:var(--green);font-size:12px;font-weight:800;transition:background .2s,color .2s}
.header-contact:hover{background:var(--green);color:#fff}
.menu-toggle{display:none;border:1px solid var(--line);background:#fff;border-radius:10px;width:42px;height:42px;align-items:center;justify-content:center;color:var(--ink);cursor:pointer}
.menu-toggle svg{height:21px;width:21px}
.mobile-panel{display:none}
.progress-line{position:fixed;z-index:110;top:0;left:0;height:2px;background:var(--green);width:0%;pointer-events:none}
.hero{position:relative;overflow:hidden;padding:99px 0 80px}
.hero:before{content:"";position:absolute;right:-180px;top:-275px;width:660px;height:660px;background:radial-gradient(circle,#d9ecdf 0%,rgba(217,236,223,0) 68%);pointer-events:none}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(350px,.88fr);gap:65px;align-items:center}
.hero-copy{position:relative;z-index:1}
.status{display:inline-flex;align-items:center;gap:9px;padding:7px 12px;border:1px solid #c9e2d6;border-radius:50px;background:#eef8f2;color:var(--green);font-size:11px;font-weight:800}
.status-dot{height:7px;width:7px;border-radius:50%;background:#40a681;box-shadow:0 0 0 4px #d8ede1}
.hero h1{font-size:clamp(39px,4.6vw,62px);line-height:1.34;letter-spacing:-.075em;margin:28px 0 21px;font-weight:850}
.hero h1 em{color:var(--green);font-style:normal}
.hero-copy>.lead{max-width:560px;margin:0;color:#546862;font-size:16px;line-height:2}
.hero-actions,.button-row{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-top:31px}
.btn{min-height:48px;display:inline-flex;align-items:center;justify-content:center;gap:10px;border-radius:10px;padding:12px 20px;font-size:13px;font-weight:800;border:1px solid transparent;cursor:pointer;transition:transform .2s var(--ease),background .2s,color .2s,box-shadow .2s}
.btn:hover{transform:translateY(-2px)}.btn-primary{background:var(--green);color:#fff;box-shadow:0 8px 22px rgba(27,111,88,.14)}.btn-primary:hover{background:var(--green-dark)}
.btn-outline{border-color:#c9d7ce;color:var(--ink);background:rgba(255,255,255,.8)}.btn-outline:hover{border-color:var(--green);color:var(--green)}
.btn-light{background:#fff;color:var(--green)}.btn-light:hover{background:#eef6f1}
.btn-text{padding:0;border:0;min-height:auto;color:var(--green);background:none}
.btn-icon{font-size:17px;line-height:1}
.hero-foot{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-top:46px;color:#637873;font-size:12px;font-weight:650}
.hero-foot .slash{color:#c5d4cb}
.hero-visual{position:relative;min-height:508px;display:flex;align-items:center;justify-content:center}
.portrait-shell{position:absolute;top:2px;right:23px;width:72%;height:88%;border-radius:170px 170px 28px 28px;overflow:hidden;background:#ebece5;box-shadow:var(--shadow)}
.portrait-shell img{width:100%;height:100%;object-fit:cover;object-position:center 27%}
.portrait-shell:after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(16,46,35,.12),transparent 50%);pointer-events:none}
.visual-note{position:absolute;left:0;bottom:6px;width:265px;background:#fff;border:1px solid var(--line);box-shadow:0 18px 55px rgba(29,64,48,.12);border-radius:17px;padding:20px 22px;z-index:2}
.visual-note .note-label{font-size:10px;letter-spacing:.1em;text-transform:uppercase;font-weight:850;color:var(--green);margin-bottom:11px}
.note-flow{display:flex;justify-content:space-between;align-items:center;gap:5px;font-size:12px;font-weight:850}
.note-flow i{font-style:normal;color:#80a99b}
.note-desc{font-size:11px;margin-top:10px;color:var(--muted)}
.visual-badge{position:absolute;right:0;top:60px;background:#194c3e;color:#fff;border-radius:10px;padding:12px 16px;z-index:3;box-shadow:0 10px 30px rgba(17,70,51,.18);font-size:11px;font-weight:750;letter-spacing:.03em}
.stats-strip{border-block:1px solid var(--line);background:#fff}
.stats-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr))}
.stat{padding:31px 35px;display:flex;gap:18px;align-items:center;border-right:1px solid var(--line)}.stat:first-child{padding-left:0}.stat:last-child{border-right:0}
.stat-num{font-size:36px;line-height:1.1;color:var(--green);font-weight:800;letter-spacing:-.08em;white-space:nowrap}.stat-label{font-size:13px;color:var(--muted);line-height:1.65}.stat-label b{display:block;color:var(--ink);font-size:13px}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:start}
.about-heading h2{font-size:clamp(30px,3vw,41px);line-height:1.48;letter-spacing:-.06em;margin:17px 0 0}
.about-text p{color:#556b64;margin:0 0 21px;line-height:2.05;font-size:15px}
.tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:23px}.tag{font-size:11px;padding:7px 12px;border-radius:100px;border:1px solid #cadbd1;color:#426a5d;font-weight:700;background:#fff}
.highlights{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.highlight-card{background:#fff;border:1px solid var(--line);border-radius:17px;padding:28px 26px;display:flex;flex-direction:column;min-height:242px;transition:transform .25s var(--ease),box-shadow .25s,border-color .25s}
.highlight-card:hover,.project-card:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:#b7d6c6}
.highlight-top{display:flex;align-items:center;justify-content:space-between;color:var(--green);font-size:11px;font-weight:800;letter-spacing:.06em}
.highlight-card h3{font-size:21px;line-height:1.48;letter-spacing:-.04em;margin:21px 0 11px}
.highlight-card p{font-size:13px;color:var(--muted);margin:0 0 23px;line-height:1.8}
.inline-link{margin-top:auto;color:var(--green);font-size:12px;font-weight:850;display:inline-flex;gap:8px;align-items:center}
.timeline{position:relative;max-width:940px;margin:0 auto}.timeline:before{content:"";position:absolute;left:181px;top:8px;bottom:8px;width:1px;background:#d3e0d8}
.timeline-item{display:grid;grid-template-columns:150px 32px 1fr;gap:14px;padding:18px 0;align-items:start}
.timeline-time{color:var(--muted);font-size:12px;font-weight:700;text-align:right;padding-top:7px}
.timeline-marker{width:13px;height:13px;margin:8px auto 0;background:#fff;border:3px solid var(--green);border-radius:50%;position:relative;z-index:1;box-shadow:0 0 0 6px var(--bg)}
.timeline-content{padding:2px 0 10px}.timeline-content h3{font-size:17px;line-height:1.5;letter-spacing:-.03em;margin:0 0 7px}.timeline-content p{font-size:13px;color:var(--muted);margin:0;line-height:1.9}.timeline-content .mini{display:block;color:var(--green);font-size:11px;font-weight:750;margin-top:9px}
.project-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.project-card{display:flex;flex-direction:column;background:#fff;overflow:hidden;border:1px solid var(--line);border-radius:19px;transition:transform .25s var(--ease),box-shadow .25s,border-color .25s}
.project-art{height:204px;position:relative;overflow:hidden;display:flex;align-items:center;justify-content:center;background:#e5eee7}.project-art.ncm{background:linear-gradient(145deg,#e8f1ea,#d3e5dc)}.project-art.mhp{background:linear-gradient(145deg,#e9f0ec,#dbe8e0)}.project-art.lfp{background:linear-gradient(145deg,#f1f0e7,#e3eadd)}
.art-label{position:absolute;top:17px;left:18px;background:rgba(255,255,255,.8);border:1px solid rgba(255,255,255,.7);backdrop-filter:blur(6px);border-radius:8px;padding:5px 9px;font-size:10px;font-weight:850;color:#4b7867;letter-spacing:.08em}
.art-svg{width:min(84%,290px);height:162px}
.project-content{padding:26px;display:flex;flex:1;flex-direction:column}.project-num{font-size:10px;color:var(--green);letter-spacing:.12em;font-weight:800;text-transform:uppercase}
.project-content h3{font-size:21px;letter-spacing:-.05em;line-height:1.4;margin:13px 0 10px}
.project-content p{font-size:13px;color:var(--muted);line-height:1.85;margin:0 0 17px;flex:1}
.project-chip{display:inline-flex;align-self:start;padding:6px 10px;background:var(--green-light);color:#396853;border-radius:7px;font-size:11px;font-weight:750;margin-bottom:23px}
.project-card .inline-link{margin-top:auto}
.skills-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:19px}
.skill-card{border:1px solid var(--line);background:#fff;border-radius:16px;padding:30px 27px}
.skill-icon{width:42px;height:42px;border-radius:13px;background:var(--green-light);display:grid;place-items:center;color:var(--green);font-size:21px;font-weight:700;margin-bottom:21px}
.skill-card h3{font-size:20px;margin:0 0 7px;letter-spacing:-.05em}.skill-card p{font-size:12px;color:var(--muted);margin:0 0 16px;line-height:1.9}.skill-lines{display:flex;gap:7px;flex-wrap:wrap}.skill-lines span{display:inline-block;border:1px solid var(--line);background:#f8faf7;border-radius:6px;padding:6px 9px;font-size:11px;color:#526e63;font-weight:650}
.pub-list{display:grid;grid-template-columns:1fr 1fr;gap:18px}.pub-card{display:flex;gap:19px;padding:26px;background:#fff;border:1px solid var(--line);border-radius:15px}
.pub-num{width:41px;height:41px;border-radius:11px;background:var(--green-light);color:var(--green);flex:none;display:grid;place-items:center;font-size:13px;font-weight:900}
.pub-card h3{font-size:16px;letter-spacing:-.03em;margin:1px 0 8px}.pub-card p{font-size:12px;color:var(--muted);margin:0 0 10px;line-height:1.8}.pub-card a{font-weight:800;font-size:11px;color:var(--green)}
.contact-section{padding:97px 0;background:#174c3e;color:#fff;position:relative;overflow:hidden}.contact-section:before{content:"";position:absolute;width:510px;height:510px;top:-300px;right:-40px;border:1px solid rgba(255,255,255,.11);border-radius:50%;box-shadow:0 0 0 90px rgba(255,255,255,.025),0 0 0 180px rgba(255,255,255,.02);pointer-events:none}
.contact-inner{display:grid;grid-template-columns:1.25fr .75fr;gap:52px;align-items:center;position:relative}.contact-inner .eyebrow{color:#a6d8bd}.contact-inner h2{font-size:clamp(31px,3.7vw,48px);letter-spacing:-.065em;line-height:1.4;margin:12px 0 16px}.contact-inner p{font-size:14px;line-height:2;color:#cfe0d6;margin:0}.contact-panel{padding:24px;background:rgba(255,255,255,.075);border:1px solid rgba(255,255,255,.16);border-radius:17px}.contact-panel .pretitle{color:#bed9c9}.contact-email{display:block;font-size:clamp(16px,1.9vw,21px);letter-spacing:-.035em;font-weight:850;margin:11px 0 20px;overflow-wrap:anywhere}.contact-panel .btn{width:100%;margin-top:9px}.contact-panel .btn-outline{background:transparent;border-color:rgba(255,255,255,.37);color:#fff}.contact-panel .btn-outline:hover{background:rgba(255,255,255,.1)}
.site-footer{background:#102e28;color:#bdcfc7;padding:26px 0}.footer-inner{display:flex;justify-content:space-between;align-items:center;gap:20px;font-size:11px}.footer-inner a:hover{color:#fff}
/* Project details */
.breadcrumb{display:flex;align-items:center;gap:9px;color:var(--muted);font-size:12px;padding-top:33px}.breadcrumb a:hover{color:var(--green)}
.detail-hero{padding:65px 0 77px}.detail-kicker{font-size:12px;letter-spacing:.12em;text-transform:uppercase;font-weight:850;color:var(--green)}
.detail-hero h1{font-size:clamp(36px,4.4vw,59px);letter-spacing:-.07em;line-height:1.31;margin:16px 0 17px}.detail-hero .lead{max-width:820px;font-size:17px;color:var(--muted)}
.detail-meta{display:flex;gap:9px;flex-wrap:wrap;margin-top:29px}.detail-meta span{font-size:12px;color:#547065;border:1px solid #d4e3d8;border-radius:8px;background:#fff;padding:7px 12px;font-weight:650}
.hero-diagram{margin-top:43px;min-height:290px;background:#e6efe8;border:1px solid #d6e3da;border-radius:20px;display:flex;align-items:center;justify-content:center;overflow:hidden;position:relative}
.hero-diagram.ncm{background:linear-gradient(115deg,#e5f0e9,#d0e3d7)}.hero-diagram.mhp{background:linear-gradient(115deg,#edf2e9,#dceae0)}.hero-diagram.lfp{background:linear-gradient(115deg,#f2f0e5,#e0ebe0)}
.hero-diagram .art-svg{height:250px;width:min(75%,620px)}.diagram-caption{position:absolute;bottom:18px;left:22px;font-size:11px;letter-spacing:.05em;color:#688477;font-weight:750}
.detail-nav{background:#fff;border-block:1px solid var(--line);position:sticky;top:78px;z-index:60;overflow-x:auto;scrollbar-width:none}.detail-nav::-webkit-scrollbar{display:none}.detail-nav .container{display:flex;gap:31px;white-space:nowrap}.detail-nav a{display:inline-flex;height:56px;align-items:center;border-bottom:2px solid transparent;font-size:11px;font-weight:800;color:var(--muted)}.detail-nav a:hover,.detail-nav a.is-active{color:var(--green);border-bottom-color:var(--green)}
.detail-section{padding:78px 0;scroll-margin-top:148px;border-bottom:1px solid var(--line)}
.detail-section:last-of-type{border-bottom:0}.detail-layout{display:grid;grid-template-columns:260px 1fr;gap:70px}.detail-section .eyebrow{margin-top:2px}.detail-section h2{margin:10px 0 0;font-size:27px}.detail-content>p{font-size:14px;color:var(--muted);line-height:2;margin:0 0 19px}
.info-slab{background:#fff;border:1px solid var(--line);padding:23px 25px;border-radius:14px}.info-slab p{margin:0;color:#526963;font-size:13px;line-height:1.95}.info-slab strong{color:var(--ink)}
.three-cols,.two-cols{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.two-cols{grid-template-columns:repeat(2,1fr)}
.mini-card{border:1px solid var(--line);background:#fff;border-radius:13px;padding:20px}.mini-card h3{font-size:15px;margin:5px 0 11px;letter-spacing:-.03em}.mini-card p{margin:0;font-size:12px;color:var(--muted);line-height:1.85}.mini-card .small-cap{font-size:10px;color:var(--green);font-weight:850;letter-spacing:.12em}
.process-steps{display:flex;align-items:stretch;gap:9px}.process-step{flex:1;min-width:0;background:#fff;border:1px solid var(--line);border-radius:12px;padding:17px 13px;text-align:center}.process-step .step-num{display:block;font-size:10px;color:var(--green);font-weight:800;margin-bottom:6px}.process-step strong{font-size:12px}.process-arrow{display:grid;place-items:center;color:#82a18f;flex:none;font-size:21px}
.data-block{background:#fff;border:1px solid var(--line);border-radius:15px;padding:26px}.data-heading{font-size:13px;font-weight:800;margin-bottom:23px}.data-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px}.data-metric{background:#f3f7f3;border-radius:11px;padding:20px 22px}.data-metric .label{font-size:11px;color:var(--muted);font-weight:700}.data-metric strong{display:block;color:var(--green);font-size:24px;line-height:1.5;margin:7px 0;letter-spacing:-.045em}.data-metric small{color:var(--muted);font-size:11px}
.finding-list{display:grid;gap:12px}.finding{display:flex;gap:15px;align-items:start;background:#fff;border:1px solid var(--line);border-radius:11px;padding:16px 18px}.finding b{flex:none;color:var(--green);font-size:12px}.finding p{font-size:13px;color:var(--ink-2);margin:0;line-height:1.8}
.notice{border-left:3px solid #9abda9;background:#edf3ec;padding:13px 18px;margin-top:15px;color:#60796a;font-size:11px;line-height:1.9;border-radius:0 8px 8px 0}
.big-result{background:#e6f0e8;border:1px solid #d2e4d6;border-radius:15px;padding:28px 30px}.big-result .pretitle{color:var(--green)}.big-result strong{display:block;color:var(--green);font-size:clamp(27px,3vw,40px);line-height:1.35;margin:7px 0}.big-result p{font-size:13px;color:#536a60;margin:0}
.project-pagination{display:grid;grid-template-columns:1fr 1fr;gap:18px;padding:34px 0 80px}.page-link{background:#fff;border:1px solid var(--line);border-radius:14px;padding:23px 25px;transition:transform .2s,border-color .2s}.page-link:hover{transform:translateY(-3px);border-color:#9abca8}.page-link small{font-size:11px;color:var(--muted)}.page-link strong{display:block;margin-top:6px;font-size:16px}.page-link.next{text-align:right}
.toast{position:fixed;z-index:200;bottom:25px;left:50%;transform:translate(-50%,20px);opacity:0;pointer-events:none;border-radius:10px;background:#193a30;color:#fff;padding:11px 19px;font-size:12px;box-shadow:0 13px 34px #0002;transition:opacity .25s,transform .25s}.toast.show{opacity:1;transform:translate(-50%,0)}
@media(max-width:1050px){.container{width:min(var(--max),calc(100% - 60px))}.desktop-nav{gap:16px}.desktop-nav a{font-size:11px}.hero-grid{gap:30px}.portrait-shell{right:6px;width:77%}.hero h1{font-size:47px}.stats-grid .stat{padding:26px 21px}.about-grid{gap:40px}.detail-layout{grid-template-columns:220px 1fr;gap:42px}}
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