:root{--navy:#12345b;--blue:#1976d2;--cyan:#20c8e8;--ink:#172033;--muted:#667085;--line:#e6ecf3;--bg:#f6f9fc;--card:#fff;--shadow:0 18px 50px rgba(18,52,91,.08)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font-family:"Noto Sans KR","Malgun Gothic",sans-serif;background:#fff;line-height:1.7}a{color:inherit;text-decoration:none}img{max-width:100%;height:auto}.container{width:min(1160px,calc(100% - 36px));margin:auto}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid rgba(230,236,243,.9)}.nav{height:78px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:12px}.brand img{width:168px;height:auto;display:block}.menu{display:flex;gap:22px;align-items:center;font-size:14px;font-weight:700;color:#4a5565}.menu a:hover{color:var(--blue)}.menu .cta{padding:10px 16px;border-radius:999px;background:var(--navy);color:#fff}
.mobile-menu{display:none}
.hero{padding:88px 0 82px;background:radial-gradient(circle at 80% 20%,rgba(32,200,232,.15),transparent 26%),linear-gradient(135deg,#f4f8ff 0%,#fff 75%)}.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}.eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--blue);font-weight:800;font-size:13px;padding:8px 13px;background:#edf5ff;border-radius:999px}.eyebrow:before{content:"";width:8px;height:8px;border-radius:50%;background:var(--cyan)}h1{margin:18px 0 0;font-size:clamp(42px,6vw,78px);line-height:1.08;letter-spacing:-.06em;color:var(--navy)}.hero h1 span{color:var(--blue)}.lead{font-size:18px;color:var(--muted);max-width:600px;margin:22px 0 0}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:50px;padding:0 20px;border-radius:14px;font-weight:800;font-size:14px}.btn.primary{background:var(--navy);color:#fff}.btn.secondary{background:#fff;border:1px solid var(--line);color:var(--navy)}
.hero-visual{min-height:430px;border-radius:34px;background:linear-gradient(145deg,#12345b,#1976d2);position:relative;overflow:hidden;box-shadow:0 28px 70px rgba(18,52,91,.18)}.ring{position:absolute;border:1px solid rgba(255,255,255,.18);border-radius:50%}.r1{width:420px;height:420px;right:-150px;top:-90px}.r2{width:290px;height:290px;right:-10px;top:50px}.r3{width:160px;height:160px;right:55px;top:115px}.math{position:absolute;color:rgba(255,255,255,.9);font-size:32px;font-weight:800}.m1{left:55px;top:70px}.m2{left:95px;bottom:120px}.m3{right:75px;bottom:70px}.hero-visual .copy{position:absolute;left:38px;bottom:36px;color:#fff}.hero-visual .copy small{color:rgba(255,255,255,.68);font-size:12px;font-weight:800;letter-spacing:.12em}.hero-visual .copy h2{margin:7px 0 0;font-size:34px;line-height:1.2;letter-spacing:-.04em}.hero-visual .copy p{margin:10px 0 0;color:rgba(255,255,255,.75)}
.section{padding:92px 0}.section.alt{background:var(--bg)}.section-head{margin-bottom:38px}.kicker{color:var(--blue);font-weight:900;font-size:12px;letter-spacing:.12em}.section h2{margin:8px 0 0;color:var(--navy);font-size:clamp(30px,4vw,44px);line-height:1.18;letter-spacing:-.045em}.section-head p{color:var(--muted);max-width:720px;margin:14px 0 0}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.card{background:var(--card);border:1px solid var(--line);border-radius:24px;padding:28px;box-shadow:var(--shadow)}.icon{width:48px;height:48px;border-radius:15px;display:grid;place-items:center;background:#edf5ff;color:var(--blue);font-weight:900;margin-bottom:20px}.card h3{margin:0;color:var(--navy);font-size:20px}.card p{margin:10px 0 0;color:var(--muted);font-size:14px;word-break:keep-all}
.page-hero{padding:70px 0 48px;background:linear-gradient(135deg,#f5f9ff,#fff)}.page-hero .title{font-size:clamp(34px,5vw,60px);margin:10px 0 0;color:var(--navy);letter-spacing:-.05em}.crumb{font-size:12px;color:#7b8798;font-weight:700}.content{padding:0 0 96px}.prose{max-width:880px}.prose h3{color:var(--navy);font-size:24px;margin:42px 0 12px}.prose p{margin:0 0 16px;color:#4d596a;word-break:keep-all}.highlight{padding:26px;border-radius:22px;background:#f1f7ff;border:1px solid #deebfb}.list{display:grid;gap:12px;margin-top:16px}.list .item{padding:18px 20px;border:1px solid var(--line);border-radius:16px;background:#fff}.item strong{color:var(--navy)}
.steps{display:grid;gap:14px}.step{display:grid;grid-template-columns:72px 1fr;gap:20px;align-items:start;padding:22px;border:1px solid var(--line);border-radius:18px;background:#fff}.num{width:52px;height:52px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff;font-weight:900}.step h4{margin:0;color:var(--navy);font-size:18px}.step p{margin:7px 0 0;color:var(--muted)}
.pill-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.pill{border-radius:24px;padding:28px;background:#fff;border:1px solid var(--line);position:relative;overflow:hidden}.pill:before{content:"";position:absolute;left:0;top:0;width:6px;height:100%;background:linear-gradient(var(--blue),var(--cyan))}.pill h4{margin:0 0 8px;color:var(--navy);font-size:18px}.pill p{margin:0;color:var(--muted);font-size:14px}
.video-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}.video-card{padding:26px;border:1px solid var(--line);border-radius:24px;background:#fff;box-shadow:var(--shadow)}.video-preview{height:220px;border-radius:18px;background:linear-gradient(135deg,#0f2f52,#2a82d7);display:grid;place-items:center;color:#fff;font-size:44px;margin-bottom:18px}.video-card h3{margin:0;color:var(--navy)}.video-card p{color:var(--muted);font-size:14px}.download{display:inline-flex;margin-top:8px;padding:10px 14px;border-radius:10px;background:var(--navy);color:#fff;font-size:13px;font-weight:800}
.contact-grid{display:grid;grid-template-columns:1fr .9fr;gap:30px}.contact-box{border-radius:26px;background:var(--navy);color:#fff;padding:34px}.contact-row{display:flex;justify-content:space-between;gap:20px;padding:14px 0;border-bottom:1px solid rgba(255,255,255,.12)}.contact-row:last-child{border-bottom:0}.contact-row span:first-child{color:rgba(255,255,255,.62)}.contact-row span:last-child{text-align:right;font-weight:700}
.footer{padding:28px 0;background:#0d2037;color:rgba(255,255,255,.62);font-size:12px}
@media(max-width:900px){.menu{display:none}.mobile-menu{display:block;font-size:22px}.hero-grid,.contact-grid{grid-template-columns:1fr}.grid3,.pill-grid{grid-template-columns:1fr 1fr}.hero-visual{min-height:360px}}
@media(max-width:620px){.container{width:min(100% - 28px,1160px)}.nav{height:68px}.brand img{width:142px}.hero{padding:64px 0}.section{padding:72px 0}.grid3,.pill-grid,.video-grid{grid-template-columns:1fr}.hero-visual{border-radius:24px}.hero-visual .copy{left:26px;right:26px;bottom:28px}.hero-visual .copy h2{font-size:28px}.step{grid-template-columns:52px 1fr;gap:14px}.contact-box{padding:24px}.contact-row{font-size:13px}}

.video-embed{position:relative;aspect-ratio:16/9;overflow:hidden;border-radius:16px;background:#111;margin-bottom:18px}
.video-embed iframe{position:absolute;inset:0;width:100%;height:100%;border:0}

/* Mobile navigation */
.mobile-menu {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  border-radius: 12px;
  background: transparent;
  color: var(--navy);
  font-size: 26px;
  line-height: 1;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.mobile-panel {
  display: none;
}

@media (max-width: 900px) {
  .mobile-menu {
    display: inline-flex;
  }

  .menu {
    display: none !important;
  }

  .mobile-panel {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: block;
    background: rgba(255,255,255,.98);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 18px 35px rgba(18,52,91,.10);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity .2s ease, transform .2s ease, visibility .2s ease;
  }

  .mobile-panel.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .mobile-panel-inner {
    width: min(100% - 28px, 1160px);
    margin: 0 auto;
    padding: 10px 0 18px;
    display: grid;
    gap: 4px;
  }

  .mobile-panel a {
    display: block;
    padding: 13px 14px;
    border-radius: 12px;
    color: var(--navy);
    font-size: 15px;
    font-weight: 700;
  }

  .mobile-panel a:hover,
  .mobile-panel a:active {
    background: var(--sky);
    color: var(--blue);
  }

  .mobile-panel .mobile-cta {
    margin-top: 6px;
    background: var(--navy);
    color: #fff;
    text-align: center;
  }
}