:root {
  --navy: #0b1b33;
  --navy-2: #12284a;
  --blue: #1f6feb;
  --cyan: #19c3d6;
  --text: #1c2533;
  --muted: #5b6678;
  --line: #e3e8ef;
  --bg: #ffffff;
  --bg-alt: #f4f7fb;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(11, 27, 51, .08);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  font-family: "Pretendard Variable", Pretendard, -apple-system, "Malgun Gothic", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  word-break: keep-all;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img, svg { display: block; max-width: 100%; }

.container { width: 100%; max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.section { padding: 110px 0; }
.section-alt { background: var(--bg-alt); }
.section-dark { background: var(--navy); color: #fff; }

.eyebrow {
  font-size: 13px; font-weight: 700; letter-spacing: .14em;
  color: var(--blue); margin-bottom: 14px;
}
.section-dark .eyebrow, .hero .eyebrow { color: var(--cyan); }
h1, h2, h3, h4 { line-height: 1.3; letter-spacing: -.02em; }
h2 { font-size: clamp(28px, 3.6vw, 40px); font-weight: 800; }
.section-head { max-width: 640px; margin-bottom: 56px; }
.section-head p:not(.eyebrow) { color: var(--muted); margin-top: 14px; font-size: 17px; }
.section-dark .section-head p:not(.eyebrow) { color: #a9b6cc; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 14px 28px; border-radius: 999px; border: 0;
  background: var(--blue); color: #fff; font: inherit; font-weight: 700;
  cursor: pointer; transition: transform .2s, background .2s, box-shadow .2s;
}
.btn:hover { background: #1a5fd0; transform: translateY(-2px); box-shadow: 0 8px 20px rgba(31, 111, 235, .3); }
.btn-ghost { background: transparent; border: 1px solid rgba(255, 255, 255, .35); }
.btn-ghost:hover { background: rgba(255, 255, 255, .1); box-shadow: none; }
.btn-sm { padding: 9px 20px; font-size: 14px; }

/* Nav */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50; height: 72px;
  display: flex; align-items: center; transition: background .3s, box-shadow .3s;
}
.nav.scrolled { background: rgba(255, 255, 255, .95); backdrop-filter: blur(10px); box-shadow: 0 1px 0 var(--line); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; }
.logo { display: flex; align-items: center; gap: 10px; color: #fff; }
.nav.scrolled .logo, .footer .logo { color: var(--navy); }
.footer .logo { color: #fff; }
.logo-mark {
  width: 34px; height: 34px; border-radius: 9px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--blue), var(--cyan)); color: #fff; font-weight: 900;
}
.logo-text { font-size: 20px; font-weight: 500; letter-spacing: -.02em; }
.logo-text b { font-weight: 800; }
.nav-links { display: flex; align-items: center; gap: 34px; }
.nav-links a { color: rgba(255, 255, 255, .85); font-weight: 600; font-size: 15px; }
.nav-links a:hover { color: #fff; }
.nav.scrolled .nav-links a:not(.btn) { color: var(--text); }
.nav.scrolled .nav-links a:not(.btn):hover { color: var(--blue); }
.nav-links .btn { color: #fff; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; margin: 5px 0; background: #fff; transition: .3s; }
.nav.scrolled .nav-toggle span { background: var(--navy); }

/* Hero */
.hero {
  position: relative; overflow: hidden; color: #fff;
  background: radial-gradient(1200px 600px at 80% 10%, #1b3d73 0%, transparent 60%),
              linear-gradient(160deg, #081427 0%, var(--navy) 55%, #0e2446 100%);
  padding: 190px 0 120px;
}
.hero-grid {
  position: absolute; inset: 0; opacity: .18;
  background-image: linear-gradient(rgba(25, 195, 214, .5) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(25, 195, 214, .5) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at 70% 30%, #000 10%, transparent 70%);
}
.hero-inner { position: relative; }
.hero h1 { font-size: clamp(36px, 6vw, 64px); font-weight: 800; letter-spacing: -.03em; }
.accent { background: linear-gradient(90deg, #4f9bff, var(--cyan)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-sub { margin-top: 24px; font-size: clamp(16px, 1.6vw, 19px); color: #b8c4d8; }
.hero-cta { display: flex; gap: 12px; margin-top: 40px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 56px; margin-top: 80px; padding-top: 32px; border-top: 1px solid rgba(255, 255, 255, .12); flex-wrap: wrap; }
.hero-stats strong { display: block; font-size: 36px; font-weight: 800; }
.hero-stats span { color: #93a3bd; font-size: 14px; }

/* About */
.about { display: grid; grid-template-columns: 1fr 1.4fr; gap: 64px; }
.about-text p { color: var(--muted); font-size: 17px; margin-bottom: 18px; }
.values { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 32px; }
.values li { padding: 20px; border: 1px solid var(--line); border-radius: var(--radius); }
.values b { display: block; font-size: 17px; margin-bottom: 6px; color: var(--navy); }
.values span { font-size: 14px; color: var(--muted); }

/* Cards */
.cards { display: grid; gap: 20px; }
.cards-4 { grid-template-columns: repeat(4, 1fr); }
.cards-3 { grid-template-columns: repeat(3, 1fr); }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 32px 28px; transition: transform .25s, box-shadow .25s, border-color .25s;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: transparent; }
.card h3 { font-size: 22px; margin: 20px 0 10px; }
.card p { color: var(--muted); font-size: 15px; }
.icon { width: 52px; height: 52px; border-radius: 12px; display: grid; place-items: center; background: linear-gradient(135deg, #e8f1ff, #e2f8fb); }
.icon svg { width: 26px; height: 26px; fill: none; stroke: var(--blue); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 20px; }
.tags li { font-size: 12px; font-weight: 600; padding: 4px 10px; border-radius: 999px; background: var(--bg-alt); color: var(--navy-2); }

/* Solutions */
.solution { display: grid; grid-template-columns: 1.1fr 1fr; gap: 64px; align-items: center; margin-bottom: 96px; }
.solution.reverse .solution-info { order: 2; }
.badge { display: inline-block; font-size: 13px; font-weight: 700; color: var(--blue); background: #e8f1ff; padding: 5px 12px; border-radius: 999px; }
.solution h3 { font-size: clamp(26px, 3vw, 32px); margin: 16px 0 14px; }
.solution-info > p { color: var(--muted); font-size: 16px; }
.checks { margin-top: 22px; display: grid; gap: 10px; }
.checks li { position: relative; padding-left: 28px; font-size: 15px; }
.checks li::before {
  content: ""; position: absolute; left: 0; top: 5px; width: 18px; height: 18px; border-radius: 50%;
  background: var(--blue) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3'%3E%3Cpath d='M6 12l4 4 8-8'/%3E%3C/svg%3E") center/12px no-repeat;
}
.solution-visual {
  background: linear-gradient(150deg, var(--navy) 0%, var(--navy-2) 100%);
  border-radius: 20px; padding: 40px; min-height: 300px; display: grid; place-items: center;
  box-shadow: var(--shadow);
}
.module-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; width: 100%; }
.module-grid span, .flow-row span, .flow-box {
  color: #d6e2f5; font-size: 14px; font-weight: 600; text-align: center;
  padding: 18px 8px; border-radius: 10px; background: rgba(255, 255, 255, .06); border: 1px solid rgba(255, 255, 255, .1);
}
.module-grid .hl, .flow-box.hl { background: linear-gradient(135deg, var(--blue), var(--cyan)); color: #fff; border-color: transparent; }
.flow { width: 100%; display: grid; gap: 10px; }
.flow-row { display: flex; gap: 10px; }
.flow-row span { flex: 1; padding: 14px 6px; }
.flow-arrow { text-align: center; color: var(--cyan); font-size: 14px; }
.bars { width: 100%; display: grid; gap: 18px; }
.bars div { display: grid; grid-template-columns: 70px 1fr; align-items: center; gap: 14px; }
.bars label { color: #b8c4d8; font-size: 13px; font-weight: 600; }
.bars i { display: block; height: 14px; border-radius: 7px; width: var(--w); background: linear-gradient(90deg, var(--blue), var(--cyan)); }
.sub-solutions { margin-top: 16px; }
.card-sm { padding: 26px 24px; }
.card-sm h4 { font-size: 18px; margin-bottom: 8px; color: var(--navy); }
.card-sm h4::before { content: ""; display: block; width: 28px; height: 3px; border-radius: 2px; background: var(--blue); margin-bottom: 14px; }

/* References */
.ref { padding: 32px 28px; border-radius: var(--radius); background: rgba(255, 255, 255, .04); border: 1px solid rgba(255, 255, 255, .1); transition: background .25s, transform .25s; }
.ref:hover { background: rgba(255, 255, 255, .08); transform: translateY(-6px); }
.ref-logo { font-size: 24px; font-weight: 800; letter-spacing: -.02em; }
.ref-type { display: inline-block; margin: 10px 0 16px; font-size: 12px; font-weight: 700; color: var(--cyan); border: 1px solid rgba(25, 195, 214, .4); padding: 3px 10px; border-radius: 999px; }
.ref p { color: #a9b6cc; font-size: 14px; }

/* Tech */
.tech-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.tech { padding: 28px; border-radius: var(--radius); background: var(--bg-alt); }
.tech h4 { font-size: 17px; margin-bottom: 14px; color: var(--navy); }
.tech ul { display: flex; flex-wrap: wrap; gap: 8px; }
.tech li { font-size: 14px; background: #fff; border: 1px solid var(--line); padding: 6px 12px; border-radius: 8px; }

/* Contact */
.contact { display: grid; grid-template-columns: 1fr 1.2fr; gap: 64px; }
.contact-lead { color: var(--muted); margin: 18px 0 36px; font-size: 17px; }
.contact-info { display: grid; gap: 18px; }
.contact-info div { display: grid; grid-template-columns: 70px 1fr; }
.contact-info dt { font-weight: 700; color: var(--navy); }
.contact-info dd { color: var(--muted); }
.contact-info a:hover { color: var(--blue); }
.contact-form { background: #fff; padding: 36px; border-radius: 20px; box-shadow: var(--shadow); display: grid; gap: 16px; }
.contact-form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.contact-form label { display: grid; gap: 6px; font-size: 14px; font-weight: 600; color: var(--navy); }
.contact-form input, .contact-form select, .contact-form textarea {
  font: inherit; font-weight: 400; padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px;
  background: #fbfcfe; transition: border-color .2s, box-shadow .2s; resize: vertical;
}
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus {
  outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px rgba(31, 111, 235, .15);
}
.form-note { font-size: 13px; color: var(--muted); text-align: center; }

/* Footer */
.footer { background: #07111f; color: #7f8ca3; padding: 44px 0; font-size: 14px; }
.footer-inner { display: flex; justify-content: space-between; align-items: flex-end; gap: 20px; flex-wrap: wrap; }
.footer-inner p { margin-top: 14px; }

/* Reveal animation */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.reveal.show { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* Responsive */
@media (max-width: 1024px) {
  .cards-4 { grid-template-columns: repeat(2, 1fr); }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .about, .contact { grid-template-columns: 1fr; gap: 36px; }
  .solution { grid-template-columns: 1fr; gap: 36px; margin-bottom: 72px; }
  .solution.reverse .solution-info { order: 0; }
}
@media (max-width: 820px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: fixed; top: 72px; left: 0; right: 0; flex-direction: column; gap: 0;
    background: #fff; padding: 12px 24px 24px; box-shadow: 0 10px 20px rgba(0, 0, 0, .08);
    transform: translateY(-120%); transition: transform .3s; z-index: -1;
  }
  .nav-links.open { transform: none; }
  .nav-links a:not(.btn) { color: var(--text) !important; width: 100%; padding: 14px 0; border-bottom: 1px solid var(--line); }
  .nav-links .btn { margin-top: 16px; width: 100%; }
  .nav.menu-open { background: #fff; }
  .nav.menu-open .logo { color: var(--navy); }
  .nav.menu-open .nav-toggle span { background: var(--navy); }
  .br-pc { display: none; }
}
@media (max-width: 640px) {
  .container { padding: 0 16px; }
  .section { padding: 80px 0; }
  .hero { padding: 150px 0 90px; }
  .hero-stats { gap: 28px; margin-top: 56px; }
  .hero-stats strong { font-size: 28px; }
  .cards-4, .cards-3, .tech-grid, .values { grid-template-columns: 1fr; }
  .contact-form { padding: 24px; }
  .contact-form .row { grid-template-columns: 1fr; }
  .solution-visual { padding: 24px; min-height: 240px; }
}