/**
 * landing.css — UTAREX 랜딩 페이지 전용 스타일시트
 *
 * 기존 public/index.html 의 인라인 <style> 블록(9~264번 줄)을 분리한 파일.
 * index.html 에서 <link rel="stylesheet" href="/stylesheets/landing.css"> 로 로드.
 *
 * 로드 순서 (index.html 기준):
 *   1. Google Fonts (외부)
 *   2. landing.css (이 파일) ← style.css 보다 나중에 로드하여 우선순위 확보
 *
 * 섹션 구성:
 *   - CSS 변수 (라이트/다크 테마)
 *   - 전역 리셋
 *   - NAV
 *   - HERO
 *   - SECTIONS 공통
 *   - ABOUT
 *   - PRODUCTS / SLIDER / DIAGRAM
 *   - ZOOM BUTTON / LIGHTBOX
 *   - CONTACT / FOOTER
 *   - AUTOPLAY TOGGLE
 *   - LANG / REVEAL
 *   - RESPONSIVE
 */

/* ── CSS 변수 — 라이트 테마 (기본값) ────────────────────────────────────────── */
:root {
  --bg:#F5F7FA; --bg2:#FFFFFF; --bg3:#EEF2F8;
  --surface:#FFFFFF; --surface2:#F0F4FB;
  --border:rgba(10,36,90,0.10); --border2:rgba(10,36,90,0.06);
  --text:#0A1628; --text2:#3A4A6B; --text3:#6B7A99;
  --blue:#1A6BCC; --blueb:#2E8DFF; --cyan:#008ED4; --accent:#00C896;
  --hero:linear-gradient(160deg,#EEF6FF 0%,#F5F7FA 60%,#E8F0FF 100%);
  --shad:0 2px 16px rgba(10,36,90,0.08);
  --shadh:0 12px 40px rgba(10,36,90,0.14);
}

/* ── CSS 변수 — 다크 테마 ────────────────────────────────────────────────────── */
/* JS toggleTheme() 함수가 <html data-theme="dark"> 를 토글하면 이 변수들이 적용됨 */
[data-theme="dark"]{
  --bg:#060E1C; --bg2:#0A1628; --bg3:#0F2040;
  --surface:rgba(15,32,64,0.7); --surface2:rgba(10,22,40,0.9);
  --border:rgba(46,141,255,0.14); --border2:rgba(46,141,255,0.07);
  --text:#F0F4FF; --text2:#B0BAD0; --text3:#6B7A99;
  --blue:#2E8DFF; --blueb:#5BADFF; --cyan:#00C8FF; --accent:#00E5C3;
  --hero:linear-gradient(160deg,#060E1C 0%,#0A1628 50%,#060E1C 100%);
  --shad:0 2px 16px rgba(0,0,0,0.4);
  --shadh:0 12px 40px rgba(0,200,255,0.10);
}

/* ── 전역 리셋 ────────────────────────────────────────────────────────────────── */
*{margin:0;padding:0;box-sizing:border-box;min-width:0}
html{scroll-behavior:smooth}
body{font-family:'Inter','Noto Sans KR',sans-serif;background:var(--bg);color:var(--text);overflow-x:hidden;transition:background .35s,color .35s;word-break:keep-all;overflow-wrap:break-word}

/* ── NAV ─────────────────────────────────────────────────────────────────────── */
nav{position:fixed;top:0;left:0;right:0;z-index:999;display:flex;align-items:center;justify-content:space-between;padding:0 5%;height:66px;background:rgba(245,247,250,.9);backdrop-filter:blur(20px);border-bottom:1px solid var(--border);transition:background .35s}
[data-theme="dark"] nav{background:rgba(6,14,28,.9)}
.logo{font-family:'Plus Jakarta Sans',sans-serif;font-size:1.35rem;font-weight:900;letter-spacing:.06em;color:var(--text);text-decoration:none;display:flex;align-items:center}
.logo em{color:var(--blue);font-style:normal}
.logo img{height:36px;width:auto}
.logo-dark{display:none}
[data-theme="dark"] .logo-light{display:none}
[data-theme="dark"] .logo-dark{display:block}
.nav-links{display:flex;gap:2.2rem;list-style:none}
.nav-links a{font-size:.8rem;font-weight:500;letter-spacing:.07em;color:var(--text3);text-decoration:none;text-transform:uppercase;transition:color .2s}
.nav-links a:hover{color:var(--blue)}
.nav-right{display:flex;align-items:center;gap:.7rem}
.lang-toggle{display:flex;gap:3px}
.lang-btn{font-size:.72rem;font-family:'Space Mono',monospace;padding:4px 10px;border-radius:5px;border:1px solid var(--border);background:transparent;color:var(--text3);cursor:pointer;transition:all .2s}
.lang-btn.active{background:var(--blue);border-color:var(--blue);color:#fff}
.theme-toggle{display:flex;align-items:center;gap:.4rem;background:var(--bg3);border:1px solid var(--border);border-radius:100px;padding:4px 10px 4px 6px;cursor:pointer;font-size:.75rem;color:var(--text2);transition:all .2s;white-space:nowrap}
.theme-toggle:hover{border-color:var(--blue);color:var(--blue)}
.toggle-track{width:32px;height:18px;border-radius:9px;background:var(--border);position:relative;transition:background .3s;flex-shrink:0}
[data-theme="dark"] .toggle-track{background:var(--blue)}
.toggle-thumb{position:absolute;top:3px;left:3px;width:12px;height:12px;border-radius:50%;background:#fff;transition:transform .3s;box-shadow:0 1px 3px rgba(0,0,0,.2)}
[data-theme="dark"] .toggle-thumb{transform:translateX(14px)}

/* ── HERO ────────────────────────────────────────────────────────────────────── */
#home{min-height:100vh;display:flex;flex-direction:column;justify-content:center;padding:120px 5% 80px;position:relative;overflow:hidden;background:var(--hero)}
.hero-dots{position:absolute;inset:0;background-image:radial-gradient(circle,var(--border) 1px,transparent 1px);background-size:32px 32px;pointer-events:none;opacity:.6}
.hero-glow{position:absolute;top:-10%;right:-5%;width:600px;height:600px;border-radius:50%;background:radial-gradient(circle,rgba(46,141,255,.12) 0%,transparent 65%);pointer-events:none}
[data-theme="dark"] .hero-glow{background:radial-gradient(circle,rgba(46,141,255,.2) 0%,transparent 65%)}
.hero-content{position:relative;z-index:2;max-width:720px}
.hero-tag{display:inline-flex;align-items:center;gap:.5rem;font-family:'Space Mono',monospace;font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:var(--blue);border:1px solid rgba(46,141,255,.3);padding:5px 14px;border-radius:100px;margin-bottom:1.8rem;animation:fadeUp .7s ease both;background:rgba(46,141,255,.07)}
.hero-tag::before{content:'';width:6px;height:6px;border-radius:50%;background:var(--blue);box-shadow:0 0 6px var(--blue);animation:blink 2s infinite}
@keyframes blink{0%,100%{opacity:1}50%{opacity:.2}}
.hero-title{font-family:'Plus Jakarta Sans',sans-serif;font-size:clamp(2.8rem,5.5vw,5rem);font-weight:900;line-height:1.08;letter-spacing:-.02em;margin-bottom:1.4rem;animation:fadeUp .8s ease .1s both}
.hero-title .hl{background:linear-gradient(120deg,var(--blue),var(--cyan));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-sub{font-size:1rem;font-weight:300;color:var(--text2);line-height:1.85;max-width:520px;margin-bottom:2.5rem;animation:fadeUp .9s ease .2s both}
.hero-cta{display:flex;gap:1rem;flex-wrap:wrap;animation:fadeUp .9s ease .3s both}
.btn-primary{display:inline-flex;align-items:center;gap:.45rem;background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff;font-size:.87rem;font-weight:700;letter-spacing:.04em;padding:13px 26px;border-radius:8px;text-decoration:none;border:none;cursor:pointer;transition:transform .2s,box-shadow .2s;box-shadow:0 4px 20px rgba(46,141,255,.32)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 28px rgba(46,141,255,.45)}
.btn-ghost{display:inline-flex;align-items:center;gap:.45rem;background:transparent;color:var(--text);font-size:.87rem;font-weight:500;padding:12px 26px;border-radius:8px;text-decoration:none;border:1.5px solid var(--border);cursor:pointer;transition:all .2s}
.btn-ghost:hover{border-color:var(--blue);color:var(--blue)}
.hero-stats{position:absolute;right:5%;top:50%;transform:translateY(-50%);display:flex;flex-direction:column;gap:1rem;z-index:2;animation:fadeLeft 1s ease .4s both}
.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:18px 22px;text-align:center;min-width:148px;box-shadow:var(--shad)}
.stat-num{font-family:'Space Mono',monospace;font-size:1.9rem;font-weight:700;color:var(--blue);display:block}
.stat-lbl{font-size:.68rem;color:var(--text3);letter-spacing:.05em;margin-top:3px;display:block}
@keyframes fadeUp{from{opacity:0;transform:translateY(22px)}to{opacity:1;transform:translateY(0)}}
@keyframes fadeLeft{from{opacity:0;transform:translate(22px,-50%)}to{opacity:1;transform:translate(0,-50%)}}

/* ── SECTIONS 공통 ───────────────────────────────────────────────────────────── */
section{padding:100px 5%}
.sec-tag{font-family:'Space Mono',monospace;font-size:.68rem;letter-spacing:.18em;text-transform:uppercase;color:var(--blue);margin-bottom:.8rem}
.sec-title{font-family:'Plus Jakarta Sans',sans-serif;font-size:clamp(1.9rem,3vw,2.8rem);font-weight:900;line-height:1.15;letter-spacing:-.01em;margin-bottom:.9rem}
.sec-sub{font-size:.93rem;color:var(--text2);line-height:1.85;max-width:540px}
.divider{height:1px;background:var(--border)}

/* ── ABOUT ───────────────────────────────────────────────────────────────────── */
#about{background:var(--bg2)}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:5rem;align-items:start}
.info-table{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--border);border:1px solid var(--border);border-radius:12px;overflow:hidden;margin-top:2.2rem}
.info-cell{background:var(--bg);padding:15px 18px}
[data-theme="dark"] .info-cell{background:var(--bg3)}
.info-cell.full{grid-column:1/-1}
.info-lbl{font-size:.67rem;letter-spacing:.1em;text-transform:uppercase;color:var(--text3);margin-bottom:4px}
.info-val{font-size:.88rem;font-weight:600;color:var(--text)}
.comp-list{list-style:none;margin-top:1.8rem;display:flex;flex-direction:column;gap:.7rem}
.comp-list li{display:flex;align-items:flex-start;gap:.7rem;font-size:.86rem;color:var(--text2);line-height:1.65}
.comp-list li::before{content:'→';color:var(--blue);font-family:'Space Mono',monospace;font-size:.75rem;margin-top:3px;flex-shrink:0}

/* ── PRODUCTS ────────────────────────────────────────────────────────────────── */
#products{background:var(--bg)}
.products-header{margin-bottom:3.5rem}
.product-section{margin-bottom:4rem}
.product-section:last-child{margin-bottom:0}
.product-section.hidden{display:none}
.prod-tabs{display:flex;gap:.5rem;flex-wrap:wrap;margin-top:1.8rem}
.prod-tab{font-family:'Space Mono',monospace;font-size:.72rem;padding:6px 16px;border-radius:100px;border:1.5px solid var(--border);background:transparent;color:var(--text3);cursor:pointer;transition:all .2s;letter-spacing:.06em}
.prod-tab:hover{border-color:var(--blue);color:var(--blue)}
.prod-tab.active{background:var(--blue);border-color:var(--blue);color:#fff}
.product-layout{display:grid;grid-template-columns:1fr 1.35fr;gap:3rem;align-items:stretch;background:var(--surface);border:1px solid var(--border);border-radius:20px;padding:2.5rem;box-shadow:var(--shad);transition:box-shadow .3s}
.product-layout:hover{box-shadow:var(--shadh)}
.product-layout.rev{grid-template-columns:1.35fr 1fr}
.product-layout.rev .slider-col{order:-1}
.prod-badge{display:inline-block;font-family:'Space Mono',monospace;font-size:.65rem;letter-spacing:.12em;text-transform:uppercase;padding:4px 12px;border-radius:4px;background:rgba(46,141,255,.1);color:var(--blue);border:1px solid rgba(46,141,255,.25);margin-bottom:1rem}
.prod-name{font-family:'Plus Jakarta Sans',sans-serif;font-size:1.65rem;font-weight:900;line-height:1.15;margin-bottom:.8rem}
.prod-desc{font-size:.87rem;color:var(--text2);line-height:1.8;margin-bottom:1.5rem}
.feat-list{list-style:none;display:flex;flex-direction:column;gap:.55rem;margin-bottom:1.5rem}
.feat-list li{display:flex;align-items:flex-start;gap:.65rem;font-size:.83rem;color:var(--text2);line-height:1.6}
.fi{width:22px;height:22px;border-radius:6px;flex-shrink:0;background:rgba(46,141,255,.1);color:var(--blue);display:flex;align-items:center;justify-content:center;font-size:.7rem;margin-top:1px}
.cert-row{display:flex;flex-wrap:wrap;gap:.45rem;margin-bottom:1.5rem}
.cert-chip{font-size:.72rem;padding:4px 10px;border-radius:5px;background:var(--bg3);border:1px solid var(--border);color:var(--text2);font-weight:500}
.cases-lbl{font-size:.75rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--text3);margin-top:1.8rem;margin-bottom:.8rem;padding-top:1.4rem;border-top:1px solid var(--border)}
.mini-tl{display:flex;flex-direction:column;gap:.5rem}
.mt-item{display:flex;gap:.8rem;align-items:flex-start;font-size:.79rem;flex-direction:column}
.mt-date{font-family:'Space Mono',monospace;font-size:.67rem;color:var(--blue);white-space:normal;margin-top:1px;min-width:unset}
.mt-text{color:var(--text2);line-height:1.5}

/* ── SLIDER ──────────────────────────────────────────────────────────────────── */
.slider-col{position:relative;display:flex;flex-direction:column}
.slider-outer{position:relative;touch-action:pan-y;flex:1;display:flex;flex-direction:column}
.slider-wrap{position:relative;border-radius:14px;overflow:hidden;flex:1;min-height:260px;background:var(--bg3);box-shadow:var(--shad);width:100%;touch-action:pan-y}
.slides{display:flex;height:100%;transition:transform .45s cubic-bezier(.4,0,.2,1)}
.slide{min-width:100%;height:100%;display:flex;align-items:center;justify-content:center;background:var(--bg3);overflow:hidden}
.slide img{width:100%;height:100%;object-fit:contain;display:block}
.slider-prev,.slider-next{width:28px;height:28px;border-radius:50%;background:var(--bg3);border:1.5px solid var(--border);cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:.9rem;transition:all .2s;color:var(--text2);flex-shrink:0;padding:0}
.slider-prev:hover,.slider-next:hover{background:var(--blue);color:#fff;border-color:var(--blue)}
.sdots{display:flex;gap:6px;justify-content:center;align-items:center;margin-top:10px}
.sdot{width:7px;height:7px;border-radius:50%;background:var(--border);border:none;cursor:pointer;transition:all .2s;padding:0}
.sdot.on{background:var(--blue);width:20px;border-radius:4px}

/* ── DIAGRAM helpers ─────────────────────────────────────────────────────────── */
.dbox{background:var(--surface2);border-radius:10px;padding:1.2rem 1.4rem;border:1px solid var(--border);width:100%}
.dtitle{font-size:.7rem;color:var(--text3);font-family:'Space Mono',monospace;margin-bottom:.8rem}
.arch-row{display:flex;align-items:center;gap:.5rem;font-size:.72rem;margin-bottom:.4rem}
.arch-block{flex:1;padding:7px;border-radius:6px;text-align:center;font-size:.68rem;color:var(--text)}
.a-cloud{background:rgba(46,141,255,.12);border:1px solid rgba(46,141,255,.2)}
.a-gw{background:rgba(0,200,150,.12);border:1px solid rgba(0,200,150,.2)}
.a-dev{background:var(--bg3);border:1px solid var(--border)}
.a-arrow{color:var(--blue);text-align:center;font-size:.8rem;margin:.15rem 0}
.bar-wrap{display:flex;flex-direction:column;gap:.5rem}
.bar-row{display:flex;align-items:center;gap:.6rem;font-size:.7rem;color:var(--text2)}
.bar-lbl{width:14px;font-family:'Space Mono',monospace;font-weight:700}
.bar-track{flex:1;height:8px;background:var(--bg3);border-radius:4px;overflow:hidden}
.bar-fill{height:100%;border-radius:4px}
.bar-val{width:36px;text-align:right;font-size:.65rem;color:var(--text3)}
.case-grid{display:grid;grid-template-columns:1fr 1fr;gap:.5rem}
.case-item{padding:10px;background:var(--bg3);border-radius:8px;border:1px solid var(--border)}
.case-icon{font-size:1.1rem;margin-bottom:3px}
.case-name{font-weight:700;font-size:.72rem;color:var(--text)}
.case-sub{font-size:.62rem;color:var(--text3);margin-top:1px;line-height:1.4}

/* ── ZOOM BUTTON ─────────────────────────────────────────────────────────────── */
/* 슬라이더 위에 떠있는 이미지 확대(라이트박스 열기) 버튼 */
.slider-zoom{position:absolute;top:8px;right:8px;width:30px;height:30px;border-radius:7px;background:rgba(255,255,255,0.55);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);border:1px solid rgba(255,255,255,0.45);cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:.8rem;color:#0A1628;z-index:5;padding:0;transition:background .2s}
.slider-zoom:hover{background:rgba(255,255,255,0.88)}
[data-theme="dark"] .slider-zoom{background:rgba(10,22,40,0.55);border-color:rgba(46,141,255,0.3);color:#F0F4FF}
[data-theme="dark"] .slider-zoom:hover{background:rgba(46,141,255,0.35)}

/* ── LIGHTBOX ────────────────────────────────────────────────────────────────── */
/* 이미지 클릭 시 전체화면으로 보여주는 오버레이 */
.lightbox{position:fixed;inset:0;z-index:9999;display:none;align-items:center;justify-content:center;background:rgba(0,0,0,0);transition:background .25s}
.lightbox.open{display:flex;background:rgba(0,0,0,0.9)}
.lightbox-inner{position:relative;display:flex;align-items:center;justify-content:center;opacity:0;transform:scale(.94);transition:opacity .25s,transform .25s;max-width:90vw;max-height:90vh}
.lightbox.open .lightbox-inner{opacity:1;transform:scale(1)}
.lightbox-inner img{display:block;max-width:88vw;max-height:82vh;border-radius:10px;object-fit:contain;box-shadow:0 24px 60px rgba(0,0,0,0.7);user-select:none}
.lightbox-close{position:absolute;top:-16px;right:-16px;width:32px;height:32px;border-radius:50%;background:#fff;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:.85rem;color:#0A1628;box-shadow:0 2px 10px rgba(0,0,0,0.35);transition:transform .15s;z-index:2}
.lightbox-close:hover{transform:scale(1.12)}
.lb-prev,.lb-next{position:fixed;top:50%;transform:translateY(-50%);width:42px;height:42px;border-radius:50%;background:rgba(255,255,255,0.12);backdrop-filter:blur(4px);border:1px solid rgba(255,255,255,0.2);cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:1.3rem;color:#fff;padding:0;transition:background .2s;z-index:10000}
.lb-prev{left:16px}
.lb-next{right:16px}
.lb-prev:hover,.lb-next:hover{background:rgba(255,255,255,0.25)}

/* ── CONTACT ─────────────────────────────────────────────────────────────────── */
#contact{background:var(--bg2)}
.contact-grid{display:grid;grid-template-columns:1fr 1.25fr;gap:5rem}
.ci-list{margin-top:2rem;display:flex;flex-direction:column;gap:1.1rem}
.ci{display:flex;gap:.9rem;align-items:flex-start}
.ci-icon{width:40px;height:40px;border-radius:10px;background:rgba(46,141,255,.1);border:1px solid rgba(46,141,255,.2);display:flex;align-items:center;justify-content:center;font-size:1rem;flex-shrink:0}
.ci-lbl{font-size:.67rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text3);margin-bottom:3px}
.ci-val{font-size:.88rem;font-weight:600;color:var(--text)}
.ci-val a{color:var(--blue);text-decoration:none}
.cform{background:var(--surface);border:1px solid var(--border);border-radius:18px;padding:2.5rem;box-shadow:var(--shad)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.fg{margin-bottom:1.1rem}
.flbl{display:block;font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--text3);margin-bottom:.4rem}
.finput{width:100%;background:var(--bg);border:1.5px solid var(--border);border-radius:8px;padding:11px 14px;font-size:.87rem;font-family:inherit;color:var(--text);outline:none;transition:border-color .2s}
.finput:focus{border-color:var(--blue)}
.finput::placeholder{color:var(--text3)}
textarea.finput{height:110px;resize:vertical}
.fsubmit{width:100%;margin-top:.4rem;background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff;font-size:.9rem;font-weight:700;letter-spacing:.06em;padding:14px;border-radius:8px;border:none;cursor:pointer;transition:opacity .2s,transform .2s;box-shadow:0 4px 20px rgba(46,141,255,.3)}
.fsubmit:hover{opacity:.9;transform:translateY(-1px)}

/* ── FOOTER ──────────────────────────────────────────────────────────────────── */
footer{background:var(--bg3);border-top:1px solid var(--border);padding:2.2rem 5%;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:1rem}
.flogo{font-family:'Plus Jakarta Sans',sans-serif;font-size:1.05rem;font-weight:900;color:var(--text)}
.flogo em{color:var(--blue);font-style:normal}
.fcopy{font-size:.77rem;color:var(--text3)}
.flinks{display:flex;gap:1.5rem;list-style:none}
.flinks a{font-size:.77rem;color:var(--text3);text-decoration:none;transition:color .2s}
.flinks a:hover{color:var(--blue)}

/* ── AUTOPLAY TOGGLE (플로팅 버튼) ───────────────────────────────────────────── */
/* 화면 우하단에 고정. 슬라이더 자동 전환 켜기/끄기 */
.autoplay-toggle{position:fixed;bottom:1.5rem;right:1.5rem;z-index:900;display:inline-flex;align-items:center;gap:.45rem;font-family:'Space Mono',monospace;font-size:.68rem;letter-spacing:.08em;padding:8px 16px;border-radius:100px;border:1.5px solid var(--border);background:var(--surface);color:var(--text3);cursor:pointer;transition:all .2s,opacity .3s;box-shadow:0 4px 16px rgba(10,36,90,0.12)}
[data-theme="dark"] .autoplay-toggle{box-shadow:0 4px 16px rgba(0,0,0,0.4)}
.autoplay-toggle:hover{border-color:var(--blue);color:var(--blue)}
.autoplay-toggle.playing{border-color:var(--blue);color:var(--blue);background:var(--surface)}
.autoplay-toggle .at-dot{width:7px;height:7px;border-radius:50%;background:currentColor;flex-shrink:0}
.autoplay-toggle.playing .at-dot{animation:blink 1.2s infinite}

/* ── LANG 전환 ───────────────────────────────────────────────────────────────── */
/* JS setLang() 이 body 에 .lang-en 클래스를 토글하면 한/영 span 이 교체됨 */
body:not(.lang-en) .en{display:none!important}
body.lang-en .ko{display:none!important}

/* ── SCROLL REVEAL ───────────────────────────────────────────────────────────── */
/* JS IntersectionObserver 가 뷰포트 진입 시 .on 클래스를 추가해 나타나는 효과 */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .65s ease,transform .65s ease}
.reveal.on{opacity:1;transform:none}

/* ── RESPONSIVE ──────────────────────────────────────────────────────────────── */
@media(max-width:960px){
  .hero-stats{display:none}
  .about-grid,.contact-grid{grid-template-columns:1fr;gap:3rem}
  .product-layout,.product-layout.rev{grid-template-columns:1fr}
  .product-layout.rev .slider-col{order:0}
  .slider-col{order:-1}
  .slider-wrap{min-height:240px}
  .form-row{grid-template-columns:1fr}
  .cert-row{flex-wrap:wrap}
  .info-table{grid-template-columns:1fr}
  .info-cell.full{grid-column:1}
}
@media(max-width:640px){
  .nav-links{display:none}
  .nav-right{gap:.4rem}
  .theme-toggle span{display:none}
  .theme-toggle{padding:4px 8px}
  .hero-title{font-size:2rem}
  .hero-tag{font-size:.62rem;padding:4px 10px}
  section{padding:60px 5%}
  .prod-name{font-size:1.3rem}
  .sec-title{font-size:1.6rem}
  .case-grid{grid-template-columns:1fr}
  .footer{flex-direction:column;align-items:flex-start;gap:.8rem}
  .flinks{flex-wrap:wrap;gap:1rem}
  .mini-tl .mt-date{min-width:44px;font-size:.62rem}
  .cert-chip{font-size:.68rem}
  .dbox{padding:.9rem 1rem}
  .bar-val{font-size:.6rem}
  .product-layout{padding:1.2rem}
  .slider-wrap{min-height:200px}
}
@media(max-width:400px){
  .hero-title{font-size:1.75rem}
  .prod-name{font-size:1.15rem}
  .product-layout{padding:1rem}
  .cform{padding:1.5rem}
  .lang-btn{padding:3px 7px;font-size:.68rem}
  .slider-wrap{min-height:160px}
}
