@charset "utf-8";

/* ===================== COMMON ===================== */
:root{--c-brand:#2f3ea8;--c-brand-dark:#1c2670;--c-point:#3182f6;--c-navy:#0b1030;--c-red:#e5484d;--c-txt:#191f28;--c-txt2:#4e5968;--c-txt3:#8b95a1;--c-line:#e5e8eb;--c-bg:#f2f4f6;--c-bg2:#f9fafb;--radius-l:28px;--radius-m:20px;--radius-s:14px;--header-h:72px;}
html{scroll-behavior:smooth;scroll-padding-top:var(--header-h);}
body{font-family:"Pretendard Variable",Pretendard,-apple-system,BlinkMacSystemFont,system-ui,sans-serif;color:var(--c-txt);background:#fff;letter-spacing:-0.02em;word-break:keep-all;-webkit-font-smoothing:antialiased;}
img{max-width:100%;display:block;}
.inner{max-width:1380px;margin:0 auto;padding:0 24px;}

.sec{padding:140px 0;}
.sec_head{margin-bottom:64px;text-align:center;}
.eyebrow{margin-bottom:14px;font-size:18px;font-weight:700;color:var(--c-point);letter-spacing:0.02em;text-transform:uppercase;}
.sec_tit{font-size:51px;font-weight:800;line-height:1.3;letter-spacing:-0.035em;}
.sec_desc{margin-top:20px;font-size:22px;line-height:1.6;color:var(--c-txt2);}

.btn{display:inline-flex;align-items:center;justify-content:center;height:58px;padding:0 28px;border-radius:16px;font-size:20px;font-weight:700;transition:transform .2s, background .2s;}
.btn:active{transform:scale(0.97);}
.btn_primary{background:var(--c-point);color:#fff;}
.btn_primary:hover{background:#1b64da;}
.btn_ghost{background:rgba(255,255,255,0.1);color:#fff;}
.btn_ghost:hover{background:rgba(255,255,255,0.18);}
.btn_white{background:#fff;color:var(--c-txt);}
.btn_white:hover{background:var(--c-bg);}

.reveal{opacity:0;transform:translateY(40px);transition:opacity .8s ease, transform .8s ease;}
.reveal.is_show{opacity:1;transform:none;}

/* ===================== HEADER ===================== */
.header{position:fixed;top:0;left:0;right:0;z-index:100;height:var(--header-h);transition:background .3s, box-shadow .3s;}
.header .inner{display:flex;align-items:center;height:100%;}
.header .logo a{display:block;}
.header .logo img{width:auto;height:32px;}
.header .logo .logo_c{display:none;}
.header.is_scroll .logo .logo_w,.header.is_open .logo .logo_w{display:none;}
.header.is_scroll .logo .logo_c,.header.is_open .logo .logo_c{display:block;}
.header .gnb{margin-left:auto;}
.header .gnb ul{display:flex;gap:4px;}
.header .gnb a{display:block;padding:10px 14px;border-radius:10px;font-size:18px;font-weight:600;color:rgba(255,255,255,0.8);transition:background .2s, color .2s;}
.header .gnb a:hover{background:rgba(255,255,255,0.1);color:#fff;}
.header .btn_head{margin-left:16px;padding:10px 18px;border-radius:12px;background:var(--c-point);font-size:18px;font-weight:700;color:#fff;}
.header .btn_menu{display:none;}
.header.is_scroll{background:rgba(255,255,255,0.85);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);box-shadow:0 1px 0 var(--c-line);}
.header.is_scroll .gnb a{color:var(--c-txt2);}
.header.is_scroll .gnb a:hover{background:var(--c-bg);color:var(--c-txt);}
.header .gnb a.is_active{background:var(--c-point);color:#fff;}
.header.is_scroll .gnb a.is_active{background:#e8f3ff;color:var(--c-point);font-weight:700;}

/* 다국어 선택 */
.lang{position:relative;margin-left:8px;}
.lang .lang_btn{display:flex;align-items:center;gap:6px;height:44px;padding:0 14px;border-radius:12px;background:rgba(255,255,255,0.1);font-size:16px;font-weight:700;color:#fff;transition:background .2s, color .2s;}
.lang .lang_btn:hover{background:rgba(255,255,255,0.18);}
.lang .lang_btn svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8;}
.lang .lang_list{position:absolute;right:0;top:calc(100% + 8px);min-width:160px;padding:8px;border-radius:16px;background:#fff;box-shadow:0 16px 40px rgba(0,0,0,0.16);opacity:0;visibility:hidden;transform:translateY(-6px);transition:opacity .2s, transform .2s, visibility .2s;}
.lang.is_open .lang_list{opacity:1;visibility:visible;transform:none;}
.lang .lang_list button{display:block;width:100%;padding:12px 14px;border-radius:10px;font-size:16px;font-weight:600;color:var(--c-txt2);text-align:left;transition:background .2s;}
.lang .lang_list button:hover{background:var(--c-bg);color:var(--c-txt);}
.lang .lang_list button.is_active{background:#e8f3ff;color:var(--c-point);font-weight:700;}
.header.is_scroll .lang .lang_btn,.header.is_open .lang .lang_btn{background:var(--c-bg);color:var(--c-txt);}

/* Google 번역 기본 UI 숨김 */
#google_translate_element{display:none;}
body{top:0 !important;}
iframe.skiptranslate,.goog-te-banner-frame,#goog-gt-tt,.goog-te-balloon-frame,.VIpgJd-ZVi9od-ORHb-OEVmcd,.VIpgJd-ZVi9od-aZ2wEe-wOHMyf{display:none !important;}
.goog-text-highlight,font[style]{background:none !important;box-shadow:none !important;}

/* 번역(영/중/일) 시 줄바꿈 : keep-all 해제로 텍스트 영역 넘침 방지 */
.translated-ltr body{word-break:normal;overflow-wrap:break-word;}
.translated-ltr .header .gnb a{white-space:nowrap;}

/* ===================== 01. HERO ===================== */
.hero{position:relative;overflow:hidden;height:100vh;min-height:720px;background:radial-gradient(circle at 75% 35%, #2a3aa8 0%, rgba(42,58,168,0) 45%), linear-gradient(180deg, #05081c 0%, #0b1030 60%, #121a52 100%);color:#fff;}
.hero .hero_bg{position:absolute;inset:0;z-index:0;}
.hero .hero_video{width:100%;height:100%;object-fit:cover;}
.hero .hero_bg::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg, rgba(5,8,28,0.92) 0%, rgba(5,8,28,0.7) 50%, rgba(5,8,28,0.5) 100%), linear-gradient(180deg, rgba(5,8,28,0.6) 0%, rgba(5,8,28,0.1) 30%, rgba(5,8,28,0.7) 100%);}
.hero .inner{position:relative;z-index:2;display:flex;align-items:center;height:100%;padding-top:var(--header-h);}
.hero .hero_txt{flex:1;min-width:0;}
.hero .badge{display:inline-block;margin-bottom:24px;padding:8px 14px;border:1px solid rgba(255,255,255,0.2);border-radius:999px;font-size:17px;font-weight:600;color:rgba(255,255,255,0.8);}
.hero .tit{font-size:67px;font-weight:800;line-height:1.25;letter-spacing:-0.04em;}
.hero .tit em{font-style:normal;background:linear-gradient(90deg, #8fb6ff, #4f8bff);-webkit-background-clip:text;background-clip:text;color:transparent;}
.hero .desc{margin-top:28px;font-size:22px;line-height:1.65;color:rgba(255,255,255,0.7);}
.hero .btns{display:flex;gap:10px;margin-top:44px;}
.hero .hero_chip{display:flex;gap:12px;margin-top:56px;}
.hero .hero_chip li{padding:16px 20px;border-radius:var(--radius-s);background:rgba(255,255,255,0.06);border:1px solid rgba(255,255,255,0.08);}
.hero .hero_chip b{display:block;font-size:25px;font-weight:800;}
.hero .hero_chip span{display:block;margin-top:4px;font-size:16px;color:rgba(255,255,255,0.55);}

/* ===================== 02. EVOLUTION ===================== */
.evolution{background:#fff;}
.evolution .evo_list{display:grid;grid-template-columns:repeat(4, 1fr);gap:16px;}
.evolution .evo_item{position:relative;padding:36px 28px 40px;border-radius:var(--radius-m);background:var(--c-bg);transition:transform .3s;}
.evolution .evo_item:hover{transform:translateY(-6px);}
.evolution .evo_item .gen{display:inline-block;padding:6px 12px;border-radius:8px;background:#fff;font-size:16px;font-weight:700;color:var(--c-txt3);}
.evolution .evo_item .name{display:block;margin-top:48px;font-size:31px;font-weight:800;color:var(--c-txt3);}
.evolution .evo_item .txt{margin-top:10px;font-size:19px;color:var(--c-txt3);}
.evolution .evo_item.is_now{background:linear-gradient(160deg, var(--c-brand) 0%, var(--c-navy) 100%);box-shadow:0 24px 48px rgba(47,62,168,0.3);}
.evolution .evo_item.is_now .gen{background:var(--c-point);color:#fff;}
.evolution .evo_item.is_now .name{color:#fff;}
.evolution .evo_item.is_now .txt{color:rgba(255,255,255,0.75);}

/* ===================== 03. TUNING ===================== */
.tuning{background:var(--c-bg2);}
.tuning .tuning_list{display:grid;grid-template-columns:repeat(3, 1fr);gap:20px;}
.tuning .tuning_card{position:relative;padding:44px 36px 48px;border-radius:var(--radius-l);background:#fff;box-shadow:0 2px 20px rgba(0,0,0,0.04);transition:transform .3s, box-shadow .3s;}
.tuning .tuning_card:hover{transform:translateY(-8px);box-shadow:0 20px 40px rgba(0,0,0,0.08);}
.tuning .tuning_card .num{position:absolute;top:36px;right:36px;font-size:18px;font-weight:700;color:var(--c-txt3);}
.tuning .tuning_card .ico{display:flex;align-items:center;justify-content:center;width:72px;height:72px;border-radius:22px;}
.tuning .tuning_card .ico img{width:40px;height:40px;}
.tuning .tuning_card .name{display:block;margin-top:32px;font-size:31px;font-weight:800;}
.tuning .tuning_card .tag{display:flex;flex-wrap:wrap;gap:6px;margin-top:14px;}
.tuning .tuning_card .tag span{padding:6px 10px;border-radius:8px;font-size:17px;font-weight:600;}
.tuning .tuning_card .txt{margin-top:24px;font-size:19px;line-height:1.65;color:var(--c-txt2);}
.tuning .type_h .ico{background:#e8f3ff;}
.tuning .type_h .tag span{background:#e8f3ff;color:#1b64da;}
.tuning .type_a .ico{background:#eef0ff;}
.tuning .type_a .tag span{background:#eef0ff;color:var(--c-brand);}
.tuning .type_o .ico{background:#e6faf6;}
.tuning .type_o .tag span{background:#e6faf6;color:#0a9a85;}

/* ===================== 04. HYDROGEN ===================== */
.hydrogen{background:#fff;}
.hydrogen .paper_card{width:100%;}
.hydrogen .point_list{display:grid;grid-template-columns:repeat(3, 1fr);gap:16px;margin-top:20px;}
.hydrogen .point_list li{padding:32px 28px;border-radius:var(--radius-m);background:var(--c-bg);text-align:center;}
.hydrogen .point_list .num{font-size:18px;font-weight:700;color:var(--c-txt3);}
.hydrogen .point_list p{margin-top:12px;font-size:23px;font-weight:700;line-height:1.5;}
.hydrogen .point_list b{color:var(--c-brand);}

.hydrogen .ros_box{margin-top:80px;padding:56px;border-radius:var(--radius-l);background:var(--c-bg2);border:1px solid var(--c-line);}
.hydrogen .ros_head{display:flex;align-items:center;gap:14px;margin-bottom:36px;}
.hydrogen .ros_head strong{font-size:35px;font-weight:800;}
.hydrogen .ros_label{padding:8px 14px;border-radius:10px;background:#ffeeee;font-size:20px;font-weight:700;color:var(--c-red);}
.hydrogen .ros_list li{display:flex;align-items:flex-start;gap:24px;padding:24px 0;border-top:1px solid var(--c-line);}
.hydrogen .ros_list li:first-child{border-top:0;padding-top:0;}
.hydrogen .ros_list .num{flex:0 0 auto;font-size:31px;font-weight:800;color:var(--c-txt3);line-height:1.2;}
.hydrogen .ros_list p{padding-top:4px;font-size:20px;line-height:1.65;color:var(--c-txt2);}

.hydrogen .formula_box{margin-top:80px;text-align:center;}
.hydrogen .formula_tit{font-size:43px;font-weight:800;letter-spacing:-0.035em;}
.hydrogen .formula{display:flex;align-items:center;justify-content:center;gap:28px;margin-top:48px;}
.hydrogen .formula .mol{display:flex;flex-direction:column;align-items:center;gap:14px;}
.hydrogen .formula .ball{display:flex;align-items:center;justify-content:center;width:110px;height:110px;border-radius:50%;background:radial-gradient(circle at 30% 30%, #9fe3f2, #1aa6c8);font-size:29px;font-weight:800;color:#fff;box-shadow:0 16px 32px rgba(26,166,200,0.3);}
.hydrogen .formula .mol.is_result .ball{width:130px;height:130px;background:radial-gradient(circle at 30% 30%, #a9b8ff, var(--c-brand));box-shadow:0 16px 32px rgba(47,62,168,0.3);}
.hydrogen .formula em{font-style:normal;font-size:18px;font-weight:600;color:var(--c-txt3);}
.hydrogen .formula .op{font-size:31px;font-weight:300;color:var(--c-txt3);}
.hydrogen .formula_txt{margin-top:44px;font-size:25px;font-weight:700;}
.hydrogen .formula_txt b{color:var(--c-brand);}

/* 논문 카드 · 결과 pill (공통) */
.paper_card{padding:28px 32px;border-radius:var(--radius-m);background:var(--c-bg);text-align:left;}
.paper_card .journal{display:inline-block;padding:5px 10px;border-radius:6px;background:#fff;font-size:16px;font-weight:700;color:var(--c-txt2);}
.paper_card .paper_tit{margin-top:14px;font-size:21px;font-weight:700;line-height:1.5;color:var(--c-txt);letter-spacing:-0.01em;}
.paper_card .paper_src{margin-top:10px;font-size:16px;color:var(--c-txt3);}
.result_pill{margin-top:32px;padding:22px 28px;border-radius:999px;background:linear-gradient(90deg, #e8f3ff, #eef0ff);font-size:22px;font-weight:700;color:var(--c-brand);text-align:center;}

/* ===================== 05. OZONE ===================== */
.ozone{background:var(--c-bg2);}
.ozone .ozone_wrap{display:flex;align-items:center;gap:72px;}
.ozone .ozone_txt{flex:1;}
.ozone .ozone_txt .sec_tit{margin-bottom:32px;}
.ozone .lead{font-size:27px;font-weight:700;line-height:1.55;}
.ozone .lead b{color:var(--c-brand);}
.ozone .desc{margin-top:18px;font-size:20px;line-height:1.7;color:var(--c-txt2);}
.ozone .desc b{color:var(--c-txt);}
.ozone .paper_card{margin-top:36px;background:#fff;}
.ozone .paper_card .journal{background:var(--c-bg);}
.ozone .result_pill{background:linear-gradient(90deg, #ffeef0, #fff4f0);color:#d6334d;}
.ozone .ozone_img{flex:0 0 480px;overflow:hidden;border-radius:var(--radius-l);background:#fff;aspect-ratio:4/5;}
.ozone .ozone_img img{width:100%;height:100%;object-fit:cover;}
.ozone .notice{margin-top:56px;font-size:16px;line-height:1.6;color:var(--c-txt3);}

/* ===================== 06. SYSTEM ===================== */
.system{background:var(--c-navy);color:#fff;}
.system .sec_desc{color:rgba(255,255,255,0.65);}
.system .system_wrap{display:flex;align-items:center;gap:64px;}
.system .system_img{flex:1;overflow:hidden;border-radius:var(--radius-l);background:#151b44;aspect-ratio:16/10;}
.system .system_img img{width:100%;height:100%;object-fit:cover;}
.system .system_info{flex:0 0 420px;display:flex;flex-direction:column;gap:16px;}
.system .mode_group{padding:24px 28px;border-radius:var(--radius-m);background:rgba(255,255,255,0.06);}
.system .mode_group dt{margin-bottom:16px;font-size:17px;font-weight:700;color:#8fb6ff;text-transform:uppercase;letter-spacing:0.04em;}
.system .mode_list{display:flex;gap:8px;}
.system .mode_list li{flex:1;display:flex;flex-direction:column;align-items:center;gap:6px;padding:14px 0;border-radius:12px;background:rgba(255,255,255,0.06);}
.system .mode_list b{font-size:23px;font-weight:800;}
.system .mode_list span{font-size:15px;font-weight:600;color:rgba(255,255,255,0.55);}
.system .ctrl_list li{display:flex;align-items:center;justify-content:space-between;padding:12px 0;border-top:1px solid rgba(255,255,255,0.08);}
.system .ctrl_list li:first-child{border-top:0;padding-top:0;}
.system .ctrl_list span{font-size:17px;font-weight:700;color:rgba(255,255,255,0.55);}
.system .ctrl_list b{font-size:19px;font-weight:600;}

/* ===================== 07. SPEC ===================== */
.spec{background:#fff;}
.spec .spec_wrap{display:flex;align-items:center;gap:64px;}
.spec .spec_img{position:relative;flex:0 0 520px;display:flex;align-items:center;justify-content:center;aspect-ratio:1/1;padding:48px 72px 72px 48px;border-radius:var(--radius-l);background:var(--c-bg);}
.spec .spec_img img{width:auto;max-height:100%;}
.spec .spec_img .size_h{position:absolute;right:20px;top:48px;bottom:72px;display:flex;align-items:center;padding-left:12px;border-left:1px dashed #b0b8c1;font-size:15px;font-weight:700;color:var(--c-txt3);writing-mode:vertical-rl;}
.spec .spec_img .size_w{position:absolute;left:48px;right:72px;bottom:20px;display:flex;justify-content:center;padding-top:8px;border-top:1px dashed #b0b8c1;font-size:15px;font-weight:700;color:var(--c-txt3);}
.spec .spec_list{flex:1;display:grid;grid-template-columns:repeat(3, 1fr);gap:16px;}
.spec .spec_item{padding:32px;border-radius:var(--radius-m);background:var(--c-bg);}
.spec .spec_item dt{font-size:17px;font-weight:600;color:var(--c-txt3);}
.spec .spec_item dd{margin-top:12px;font-size:28px;font-weight:800;letter-spacing:-0.03em;}
.spec .spec_item dd small{font-size:18px;font-weight:600;color:var(--c-txt3);}
.spec .spec_item.is_main{grid-column:1 / -1;padding:40px 36px;background:linear-gradient(135deg, var(--c-brand), var(--c-navy));}
.spec .spec_item.is_main dt{color:rgba(255,255,255,0.65);}
.spec .spec_item.is_main dd{font-size:36px;color:#fff;}
.spec .spec_item.is_main dd small{color:rgba(255,255,255,0.65);}

/* ===================== 08. WHY ===================== */
.why{background:#fff;}
.why .why_list{display:grid;grid-template-columns:repeat(2, 1fr);gap:16px;}
.why .why_card{padding:44px 40px;border-radius:var(--radius-l);background:var(--c-bg);}
.why .why_card .tit{display:block;font-size:29px;font-weight:800;}
.why .why_card .txt{margin-top:14px;font-size:20px;line-height:1.65;color:var(--c-txt2);}

/* ===================== 09. FAQ ===================== */
.faq{background:var(--c-bg2);}
.faq .faq_list{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:12px;}
.faq .faq_item{border-radius:var(--radius-m);background:#fff;overflow:hidden;}
.faq .faq_item summary{position:relative;padding:26px 64px 26px 32px;font-size:21px;font-weight:700;cursor:pointer;list-style:none;}
.faq .faq_item summary::-webkit-details-marker{display:none;}
.faq .faq_item summary::after{content:"";position:absolute;right:32px;top:50%;width:10px;height:10px;margin-top:-7px;border-right:2px solid var(--c-txt3);border-bottom:2px solid var(--c-txt3);transform:rotate(45deg);transition:transform .25s;}
.faq .faq_item[open] summary::after{transform:rotate(-135deg);margin-top:-2px;}
.faq .faq_item .answer{padding:0 32px 28px;font-size:19px;line-height:1.7;color:var(--c-txt2);}

/* ===================== 10. CONTACT ===================== */
.contact{padding:140px 0;background:radial-gradient(circle at 50% 0%, #2a3aa8 0%, rgba(42,58,168,0) 60%), var(--c-navy);color:#fff;text-align:center;}
.contact .eyebrow{color:#8fb6ff;}
.contact .tit{font-size:51px;font-weight:800;line-height:1.3;letter-spacing:-0.035em;}
.contact .desc{margin-top:20px;font-size:21px;color:rgba(255,255,255,0.65);}
.contact .btns{display:flex;justify-content:center;gap:10px;margin-top:44px;}

/* ===================== FOOTER ===================== */
.footer{padding:64px 0 72px;background:#05081c;color:rgba(255,255,255,0.5);}
.footer .f_top{display:flex;align-items:center;justify-content:space-between;gap:20px;padding-bottom:32px;border-bottom:1px solid rgba(255,255,255,0.08);}
.footer .f_logo img{width:auto;height:28px;}
.footer .f_links{display:flex;flex-wrap:wrap;gap:8px;}
.footer .f_tel{padding:12px 20px;border-radius:12px;background:rgba(255,255,255,0.06);font-size:16px;color:rgba(255,255,255,0.65);}
.footer .f_tel b{margin-left:6px;font-weight:700;color:#fff;}
.footer .f_sns{display:inline-flex;align-items:center;gap:8px;padding:12px 18px;border-radius:12px;background:linear-gradient(135deg, #833ab4, #fd1d1d 60%, #fcb045);font-size:16px;font-weight:600;color:#fff;transition:filter .2s, transform .2s;}
.footer .f_sns svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.8;}
.footer .f_sns svg .dot{fill:currentColor;stroke:none;}
.footer .f_sns:hover{filter:brightness(1.1);transform:translateY(-2px);}
.footer .f_family{position:relative;}
.footer .f_family summary{display:flex;align-items:center;gap:10px;min-width:180px;padding:12px 18px;border:1px solid rgba(255,255,255,0.12);border-radius:12px;font-size:16px;font-weight:600;color:rgba(255,255,255,0.75);cursor:pointer;list-style:none;}
.footer .f_family summary::-webkit-details-marker{display:none;}
.footer .f_family summary::after{content:"";width:7px;height:7px;margin:-4px 2px 0 auto;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg);transition:transform .2s;}
.footer .f_family[open] summary{background:rgba(255,255,255,0.08);color:#fff;}
.footer .f_family[open] summary::after{margin-top:4px;transform:rotate(-135deg);}
.footer .f_family ul{position:absolute;right:0;bottom:calc(100% + 8px);z-index:5;min-width:260px;padding:8px;border-radius:16px;background:#fff;box-shadow:0 16px 40px rgba(0,0,0,0.35);}
.footer .f_family li a{display:block;padding:12px 14px;border-radius:10px;transition:background .2s;}
.footer .f_family li a:hover{background:var(--c-bg);}
.footer .f_family li b{display:block;font-size:16px;font-weight:700;color:var(--c-txt);}
.footer .f_family li span{display:block;margin-top:2px;font-size:14px;color:var(--c-txt3);}
.footer .f_office{display:grid;grid-template-columns:repeat(2, 1fr);gap:16px;margin-top:32px;}
.footer .f_office dl{padding:24px 28px;border-radius:var(--radius-m);background:rgba(255,255,255,0.04);}
.footer .f_office dt{margin-bottom:10px;font-size:16px;font-weight:700;color:#8fb6ff;}
.footer .f_office dd{font-size:16px;line-height:1.7;}
.footer .f_office dd span{display:inline-block;margin-right:16px;white-space:nowrap;}
.footer .f_info{display:flex;flex-wrap:wrap;gap:6px 20px;margin-top:32px;font-size:15px;}
.footer .f_info li{position:relative;}
.footer .f_info li+li::before{content:"";position:absolute;left:-11px;top:50%;width:1px;height:11px;margin-top:-5px;background:rgba(255,255,255,0.2);}
.footer .copy{margin-top:16px;font-size:14px;color:rgba(255,255,255,0.35);}

.fixed_cta{display:none;}

/* ===================== RESPONSIVE : TABLET ===================== */
@media (max-width:1024px){
	.sec{padding:110px 0;}
	.sec_tit{font-size:43px;}
	.header .gnb ul{gap:0;}
	.header .gnb a{padding:10px 10px;font-size:17px;}
	.hero .tit{font-size:55px;}
	.evolution .evo_list{grid-template-columns:repeat(2, 1fr);}
	.ozone .ozone_wrap{gap:40px;}
	.ozone .ozone_img{flex:0 0 380px;}
	.system .system_wrap{flex-direction:column;align-items:stretch;gap:32px;}
	.system .system_info{flex:none;}
	.spec .spec_wrap{flex-direction:column;align-items:stretch;gap:32px;}
	.spec .spec_img{flex:none;width:100%;max-width:520px;margin:0 auto;}
}

/* ===================== RESPONSIVE : MOBILE ===================== */
@media (max-width:768px){
	:root{--header-h:60px;--radius-l:22px;--radius-m:18px;}
	.inner{padding:0 20px;}
	.sec{padding:88px 0;}
	.sec_head{margin-bottom:40px;}
	.eyebrow{font-size:16px;}
	.sec_tit{font-size:33px;}
	.sec_desc{margin-top:14px;font-size:19px;}
	.btn{height:54px;font-size:19px;}

	.header .gnb{position:fixed;top:var(--header-h);left:0;right:0;margin:0;padding:12px 20px 24px;background:#fff;box-shadow:0 12px 24px rgba(0,0,0,0.08);opacity:0;visibility:hidden;transform:translateY(-10px);transition:all .25s;}
	.header .gnb ul{flex-direction:column;}
	.header .gnb a{padding:16px 16px;font-size:20px;color:var(--c-txt);}
	.header .btn_head{display:none;}
	.lang{margin-left:auto;}
	.lang .lang_btn{height:38px;padding:0 10px;font-size:14px;}
	.lang .lang_btn svg{width:16px;height:16px;}
	.header .btn_menu{display:flex;flex-direction:column;justify-content:center;gap:5px;width:40px;height:40px;margin-left:4px;padding:0 9px;background:none;border:0;cursor:pointer;}
	.header .btn_menu span{display:block;height:2px;border-radius:2px;background:#fff;transition:transform .25s, opacity .25s;}
	.header.is_scroll .btn_menu span{background:var(--c-txt);}
	.header.is_open{background:#fff;}
	.header.is_open .btn_menu span{background:var(--c-txt);}
	.header.is_open .btn_menu span:nth-child(1){transform:translateY(7px) rotate(45deg);}
	.header.is_open .btn_menu span:nth-child(2){opacity:0;}
	.header.is_open .btn_menu span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}
	.header.is_open .gnb{opacity:1;visibility:visible;transform:none;}

	.hero{height:auto;min-height:100vh;min-height:100svh;}
	.hero .inner{height:auto;min-height:100vh;min-height:100svh;padding-top:calc(var(--header-h) + 40px);padding-bottom:56px;}
	.hero .badge{margin-bottom:18px;font-size:15px;}
	.hero .tit{font-size:37px;}
	.hero .desc{margin-top:20px;font-size:19px;}
	.hero .btns{flex-direction:column;margin-top:32px;}
	.hero .hero_chip{gap:8px;margin-top:32px;}
	.hero .hero_chip li{flex:1;padding:14px 12px;}
	.hero .hero_chip b{font-size:20px;}
	.hero .hero_chip span{font-size:14px;}

	.evolution .evo_list{grid-template-columns:1fr;gap:10px;}
	.evolution .evo_item{display:flex;flex-wrap:wrap;align-items:center;gap:6px 14px;padding:24px;}
	.evolution .evo_item:hover{transform:none;}
	.evolution .evo_item .name{margin-top:0;font-size:25px;}
	.evolution .evo_item .txt{width:100%;margin-top:0;font-size:18px;}

	.tuning .tuning_list{grid-template-columns:1fr;gap:12px;}
	.tuning .tuning_card{padding:32px 28px 36px;}
	.tuning .tuning_card .num{top:28px;right:28px;}
	.tuning .tuning_card .ico{width:60px;height:60px;border-radius:18px;}
	.tuning .tuning_card .ico img{width:32px;height:32px;}
	.tuning .tuning_card .name{margin-top:24px;font-size:27px;}
	.tuning .tuning_card .txt{margin-top:18px;font-size:18px;}

	.paper_card{padding:22px 22px;}
	.paper_card .paper_tit{font-size:19px;}
	.result_pill{margin-top:24px;padding:18px 20px;border-radius:var(--radius-m);font-size:19px;}

	.hydrogen .point_list{grid-template-columns:1fr;gap:10px;}
	.hydrogen .point_list li{display:flex;align-items:center;gap:20px;padding:22px 24px;text-align:left;}
	.hydrogen .point_list p{margin-top:0;font-size:20px;}
	.hydrogen .ros_box{margin-top:56px;padding:32px 24px;}
	.hydrogen .ros_head{flex-direction:column;align-items:flex-start;gap:10px;margin-bottom:24px;}
	.hydrogen .ros_head strong{font-size:27px;}
	.hydrogen .ros_label{font-size:18px;}
	.hydrogen .ros_list li{gap:16px;padding:20px 0;}
	.hydrogen .ros_list .num{font-size:25px;}
	.hydrogen .ros_list p{font-size:18px;}
	.hydrogen .ros_list p br{display:none;}
	.hydrogen .formula_box{margin-top:64px;}
	.hydrogen .formula_tit{font-size:31px;}
	.hydrogen .formula{gap:10px;margin-top:32px;}
	.hydrogen .formula .ball{width:72px;height:72px;font-size:21px;}
	.hydrogen .formula .mol.is_result .ball{width:86px;height:86px;}
	.hydrogen .formula em{font-size:16px;}
	.hydrogen .formula .op{font-size:23px;}
	.hydrogen .formula_txt{margin-top:32px;font-size:20px;}

	.ozone .ozone_wrap{flex-direction:column-reverse;align-items:stretch;gap:32px;}
	.ozone .ozone_img{flex:none;aspect-ratio:1/1;}
	.ozone .ozone_txt .sec_tit{margin-bottom:20px;}
	.ozone .lead{font-size:22px;}
	.ozone .desc{font-size:18px;}
	.ozone .notice{margin-top:40px;font-size:15px;}

	.system .system_info{gap:10px;}
	.system .mode_group{padding:20px;}
	.system .mode_list{gap:6px;}
	.system .mode_list b{font-size:20px;}
	.system .mode_list span{font-size:14px;}

	.spec .spec_img{padding:28px 56px 56px 28px;}
	.spec .spec_img .size_h{right:14px;top:28px;bottom:56px;font-size:13px;}
	.spec .spec_img .size_w{left:28px;right:56px;bottom:14px;font-size:13px;}
	.spec .spec_list{grid-template-columns:1fr 1fr;gap:10px;}
	.spec .spec_item:nth-child(2){grid-column:1 / -1;}
	.spec .spec_item.is_main{padding:26px 22px;}
	.spec .spec_item.is_main dd{font-size:23px;}
	.spec .spec_item{padding:22px 20px;}
	.spec .spec_item dt{font-size:15px;}
	.spec .spec_item dd{margin-top:8px;font-size:21px;}
	.spec .spec_item dd small{font-size:15px;}

	.why .why_list{grid-template-columns:1fr;gap:10px;}
	.why .why_card{padding:30px 28px;}
	.why .why_card .tit{font-size:24px;}
	.why .why_card .txt{font-size:18px;}
	.why .why_card .txt br{display:none;}

	.faq .faq_item summary{padding:22px 52px 22px 22px;font-size:19px;}
	.faq .faq_item summary::after{right:24px;}
	.faq .faq_item .answer{padding:0 22px 22px;font-size:18px;}

	.contact{padding:96px 0;}
	.contact .tit{font-size:33px;}
	.contact .desc{font-size:19px;}
	.contact .btns{flex-direction:column;margin-top:32px;}

	.footer{padding:44px 0 120px;}
	.footer .f_top{flex-direction:column;align-items:flex-start;gap:16px;}
	.footer .f_logo img{height:24px;}
	.footer .f_tel,.footer .f_sns,.footer .f_family summary{font-size:15px;}
	.footer .f_links{display:grid;grid-template-columns:1fr 1fr;width:100%;}
	.footer .f_tel{grid-column:1 / -1;text-align:center;}
	.footer .f_sns{justify-content:center;}
	.footer .f_family summary{min-width:0;}
	.footer .f_family ul{min-width:240px;}
	.footer .f_office{grid-template-columns:1fr;gap:10px;margin-top:24px;}
	.footer .f_office dl{padding:20px 22px;}
	.footer .f_office dd{font-size:15px;}
	.footer .f_info{flex-direction:column;gap:4px;font-size:14px;}
	.footer .f_info li+li::before{display:none;}

	.fixed_cta{display:block;position:fixed;left:0;right:0;bottom:0;z-index:90;padding:12px 20px calc(12px + env(safe-area-inset-bottom));background:linear-gradient(180deg, rgba(255,255,255,0), #fff 30%);transform:translateY(110%);transition:transform .3s;}
	.fixed_cta.is_show{transform:none;}
	.fixed_cta .btn{width:100%;}
}