/* ===== QDIC — Trust through precision ===== */
:root{
  --navy-900:#0f2847;
  --navy-800:#15365e;
  --navy-700:#1a4a82;
  --navy-600:#1e6fc4;
  --teal-500:#1e6fc4;   /* QDIC brand blue */
  --teal-400:#4a90d9;
  --gray-brand:#808285; /* QDIC brand gray */
  --ink:#1a2738;
  --slate-700:#334155;
  --slate-500:#64748b;
  --slate-300:#cbd5e1;
  --slate-200:#e2e8f0;
  --slate-100:#f1f5f9;
  --bg:#fbfcfd;
  --bg-alt:#f4f7fa;
  --white:#ffffff;
  --line:#e5ebf1;
  --shadow-sm:0 1px 2px rgba(15,30,50,.04), 0 1px 1px rgba(15,30,50,.03);
  --shadow-md:0 8px 24px rgba(15,30,50,.06), 0 2px 6px rgba(15,30,50,.04);
  --radius:10px;
  --radius-lg:16px;
  --maxw:1160px;
  --font-sans:'Inter','Noto Sans KR',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  --font-serif:'Noto Serif KR',Georgia,'Times New Roman',serif;
  --font-mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.65;
  color:var(--ink);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
a:hover{color:var(--teal-500)}

.container{
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 28px;
}

/* ===== Header ===== */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.88);
  backdrop-filter:saturate(180%) blur(12px);
  -webkit-backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--line);
}
.nav{
  display:flex;align-items:center;justify-content:space-between;
  height:72px;
}
.brand{display:flex;align-items:center;gap:12px;color:var(--navy-900)}
.brand-mark{color:var(--teal-500);display:inline-flex}
.brand-logo{height:44px;width:auto;display:block}
.brand-text{display:flex;flex-direction:column;line-height:1.1}
.brand-text strong{font-weight:700;font-size:18px;letter-spacing:.04em}
.brand-text small{font-size:10.5px;color:var(--slate-500);letter-spacing:.12em;text-transform:uppercase;margin-top:2px}
.nav-links{display:flex;gap:32px}
.nav-links a{
  font-size:14px;font-weight:500;color:var(--slate-700);
  position:relative;padding:4px 0;
  transition:color .2s ease;
}
.nav-links a::after{
  content:"";position:absolute;left:0;bottom:-2px;height:1.5px;width:0;
  background:var(--teal-500);transition:width .25s ease;
}
.nav-links a:hover{color:var(--navy-900)}
.nav-links a:hover::after{width:100%}

/* ===== Hero ===== */
.hero{
  position:relative;
  padding:96px 0 80px;
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(30,111,196,.08), transparent 60%),
    linear-gradient(180deg, #fbfcfd 0%, #f4f7fa 100%);
  overflow:hidden;
}
.hero::before{
  content:"";position:absolute;inset:0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size:48px 48px;
  opacity:.35;
  mask-image:radial-gradient(ellipse at center, #000 40%, transparent 75%);
  -webkit-mask-image:radial-gradient(ellipse at center, #000 40%, transparent 75%);
  pointer-events:none;
}
.hero-grid{
  position:relative;
  display:grid;grid-template-columns:1.05fr .95fr;gap:64px;align-items:center;
}
.eyebrow{
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--teal-500);margin:0 0 20px;
  display:inline-flex;align-items:center;gap:10px;
}
.eyebrow::before{
  content:"";width:24px;height:1px;background:var(--teal-500);
}
.eyebrow-light{color:var(--teal-400)}
.eyebrow-light::before{background:var(--teal-400)}

.hero h1{
  font-family:var(--font-serif);
  font-size:clamp(34px, 4.8vw, 56px);
  line-height:1.2;
  font-weight:700;
  color:var(--navy-900);
  margin:0 0 24px;
  letter-spacing:-.01em;
}
.hero h1 .accent{color:var(--teal-500);position:relative;white-space:nowrap}
.hero h1 .accent::after{
  content:"";position:absolute;left:0;right:0;bottom:.08em;height:.18em;
  background:rgba(30,111,196,.18);z-index:-1;
}
.lead{
  font-size:17px;line-height:1.75;color:var(--slate-700);
  max-width:560px;margin:0 0 32px;
}
.cta-row{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:48px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:13px 24px;border-radius:var(--radius);
  font-size:14px;font-weight:600;letter-spacing:.01em;
  transition:all .22s ease;cursor:pointer;border:1px solid transparent;
  white-space:nowrap;
}
.btn-primary{
  background:var(--navy-900);color:var(--white);
  box-shadow:0 4px 14px rgba(10,26,47,.18);
}
.btn-primary:hover{
  background:var(--navy-700);transform:translateY(-1px);color:var(--white);
  box-shadow:0 8px 22px rgba(10,26,47,.24);
}
.btn-ghost{
  background:transparent;color:var(--navy-900);
  border-color:var(--slate-300);
}
.btn-ghost:hover{border-color:var(--navy-900);color:var(--navy-900)}
.btn-light{
  background:var(--white);color:var(--navy-900);margin-top:16px;
}
.btn-light:hover{background:var(--slate-100);color:var(--navy-900)}

.hero-stats{
  display:grid;grid-template-columns:repeat(3,1fr);
  gap:24px;margin:0;padding-top:28px;
  border-top:1px solid var(--line);
}
.hero-stats>div dt{
  font-family:var(--font-mono);
  font-size:12.5px;font-weight:500;color:var(--navy-800);
  letter-spacing:.02em;margin-bottom:4px;
}
.hero-stats>div dd{
  margin:0;font-size:13px;color:var(--slate-500);
}

/* Hero visual */
.hero-visual{
  position:relative;
}
.pk-chart{
  width:100%;height:auto;
  background:var(--white);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow-md);
  padding:8px;
}
.pk-chart .grid line{stroke:var(--slate-300);stroke-width:1}
.pk-chart .grid .tick line{stroke:var(--slate-200);stroke-dasharray:3 4}
.pk-chart .axis-label{
  font-family:var(--font-mono);font-size:10px;fill:var(--slate-500);
}
.pk-chart .chart-title{
  font-family:var(--font-mono);font-size:10.5px;fill:var(--navy-800);
  letter-spacing:.08em;text-transform:uppercase;
}
.pk-chart .band{fill:rgba(30,111,196,.13)}
.pk-chart .curve{
  stroke:var(--teal-500);stroke-width:2.2;fill:none;
  stroke-linecap:round;stroke-linejoin:round;
}
.pk-chart .points circle{
  fill:var(--white);stroke:var(--navy-900);stroke-width:1.6;
}
.pk-chart .annotation line{stroke:var(--navy-700);stroke-width:1;stroke-dasharray:2 3}
.pk-chart .annotation text{
  font-family:var(--font-mono);font-size:10px;fill:var(--navy-900);
  font-weight:600;
}

/* ===== Sections ===== */
.section{padding:112px 0}
.section-alt{background:var(--bg-alt);border-block:1px solid var(--line)}
.section-dark{background:var(--navy-900);color:var(--white)}

.section-head{max-width:720px;margin:0 auto 64px;text-align:center}
.section-num{
  display:inline-block;font-family:var(--font-mono);font-size:12px;
  color:var(--teal-500);letter-spacing:.16em;margin-bottom:14px;
}
.section-head h2{
  font-family:var(--font-serif);font-weight:700;
  font-size:clamp(28px,3.2vw,40px);color:var(--navy-900);
  margin:0 0 14px;letter-spacing:-.005em;line-height:1.25;
}
.section-sub{font-size:16px;color:var(--slate-500);margin:0}
.section-dark .section-head h2{color:var(--white)}

/* About */
.about-grid{
  display:grid;grid-template-columns:1.1fr 1fr;gap:64px;align-items:start;
}
.about-text{
  font-size:17px;line-height:1.8;color:var(--slate-700);margin:0;
}
.about-text em{
  font-style:normal;color:var(--navy-900);font-weight:600;
  border-bottom:2px solid var(--teal-500);padding-bottom:1px;
}
.principles{list-style:none;padding:0;margin:0;display:grid;gap:20px}
.principles li{
  padding:24px 26px;background:var(--white);
  border:1px solid var(--line);border-left:3px solid var(--teal-500);
  border-radius:var(--radius);box-shadow:var(--shadow-sm);
  transition:transform .25s ease, box-shadow .25s ease;
}
.principles li:hover{transform:translateX(3px);box-shadow:var(--shadow-md)}
.principles h3{
  margin:0 0 6px;font-size:16px;color:var(--navy-900);
  font-weight:600;letter-spacing:.02em;
}
.principles p{margin:0;font-size:14.5px;color:var(--slate-500);line-height:1.6}

/* Services */
.services-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:24px;
}
.service-card{
  padding:32px 28px;background:var(--white);
  border:1px solid var(--line);border-radius:var(--radius-lg);
  transition:all .25s ease;position:relative;overflow:hidden;
}
.service-card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:2px;
  background:var(--teal-500);transform:scaleX(0);transform-origin:left;
  transition:transform .3s ease;
}
.service-card:hover{
  border-color:var(--slate-300);transform:translateY(-4px);
  box-shadow:var(--shadow-md);
}
.service-card:hover::before{transform:scaleX(1)}
.service-icon{
  width:48px;height:48px;border-radius:10px;
  background:rgba(30,111,196,.1);color:var(--teal-500);
  display:inline-flex;align-items:center;justify-content:center;margin-bottom:20px;
}
.service-card h3{
  margin:0 0 10px;font-size:17px;font-weight:600;color:var(--navy-900);
  letter-spacing:-.005em;
}
.service-card p{margin:0;font-size:14.5px;color:var(--slate-500);line-height:1.65}
.service-card.service-card-wide{grid-column:span 2}
.service-num{
  font-family:var(--font-mono);font-size:12px;font-weight:600;
  color:var(--teal-500);letter-spacing:.14em;
  display:inline-block;padding:4px 10px;
  background:rgba(30,111,196,.08);border-radius:4px;margin-bottom:16px;
}
.service-list{
  list-style:none;padding:0;margin:0;
}
.service-list li{
  position:relative;padding:7px 0 7px 16px;
  font-size:14.5px;color:var(--slate-700);line-height:1.55;
  border-bottom:1px dashed var(--line);
}
.service-list li:last-child{border-bottom:none}
.service-list li::before{
  content:"";position:absolute;left:0;top:15px;width:6px;height:6px;
  border-radius:50%;background:var(--teal-500);opacity:.7;
}
.service-list.service-list-2col{
  display:grid;grid-template-columns:1fr 1fr;column-gap:24px;
}
.service-list.service-list-2col li:nth-last-child(2){border-bottom:none}
.service-card em{
  font-style:italic;color:var(--navy-700);font-weight:500;
}

/* Equipment */
.equipment-grid{
  display:grid;grid-template-columns:repeat(2,1fr);gap:24px;
}
.equipment-card{
  padding:28px 30px;background:var(--white);
  border:1px solid var(--line);border-radius:var(--radius-lg);
  transition:all .25s ease;
}
.equipment-card:hover{
  border-color:var(--slate-300);box-shadow:var(--shadow-md);
}
.equipment-head{
  display:flex;justify-content:space-between;align-items:baseline;
  padding-bottom:18px;margin-bottom:18px;
  border-bottom:2px solid var(--teal-500);gap:12px;flex-wrap:wrap;
}
.equipment-head h3{
  margin:0;font-size:18px;font-weight:600;color:var(--navy-900);
  letter-spacing:-.005em;
}
.equipment-qty{
  font-family:var(--font-mono);font-size:11.5px;
  color:var(--teal-500);letter-spacing:.08em;
  background:rgba(30,111,196,.08);padding:3px 10px;border-radius:4px;
  white-space:nowrap;
}
.equipment-spec{
  display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:0 0 18px;
  padding:14px 16px;background:var(--bg-alt);border-radius:var(--radius);
}
.equipment-spec>div{display:flex;flex-direction:column;gap:2px;min-width:0}
.equipment-spec dt{
  font-family:var(--font-mono);font-size:10.5px;
  color:var(--slate-500);letter-spacing:.1em;text-transform:uppercase;
}
.equipment-spec dd{
  margin:0;font-size:14px;font-weight:600;color:var(--navy-900);
  line-height:1.4;word-break:keep-all;
}
.equipment-params{
  list-style:none;padding:0;margin:0;
}
.equipment-params li{
  font-family:var(--font-mono);font-size:12.5px;color:var(--slate-700);
  padding:4px 0;line-height:1.6;
}

/* Experience */
.experience-list{
  list-style:none;padding:0;margin:0;
  display:grid;grid-template-columns:repeat(2,1fr);gap:20px 40px;
  counter-reset:exp;
}
.experience-list li{
  display:flex;gap:20px;align-items:flex-start;
  padding:24px 0;border-top:1px solid var(--line);
}
.experience-list li:nth-child(-n+2){border-top:none;padding-top:0}
.exp-num{
  flex-shrink:0;
  font-family:var(--font-mono);font-size:13px;font-weight:600;
  color:var(--white);background:var(--teal-500);
  width:32px;height:32px;border-radius:50%;
  display:inline-flex;align-items:center;justify-content:center;
  letter-spacing:.02em;
}
.experience-list h3{
  margin:6px 0 0;font-size:15.5px;font-weight:600;color:var(--navy-900);
  line-height:1.5;letter-spacing:-.003em;
}
.experience-list ul{
  list-style:none;padding:0;margin:10px 0 0;
}
.experience-list ul li{
  display:block;padding:3px 0 3px 14px;border:none;
  position:relative;font-size:14px;color:var(--slate-500);line-height:1.55;
}
.experience-list ul li::before{
  content:"";position:absolute;left:0;top:12px;
  width:6px;height:1.5px;background:var(--teal-500);
}

/* Approach */
.approach-steps{
  list-style:none;padding:0;margin:0;
  display:grid;grid-template-columns:repeat(4,1fr);gap:0;
  counter-reset:step;
}
.approach-steps li{
  padding:36px 28px;position:relative;
  border-left:1px solid var(--line);
}
.approach-steps li:first-child{border-left:none}
.approach-steps li::before{
  content:"";position:absolute;top:36px;left:-5px;width:9px;height:9px;
  border-radius:50%;background:var(--teal-500);
  box-shadow:0 0 0 4px var(--bg);
}
.approach-steps li:first-child::before{display:none}
.step-num{
  font-family:var(--font-mono);font-size:12px;font-weight:500;
  color:var(--teal-500);letter-spacing:.12em;
}
.approach-steps h3{
  margin:8px 0 10px;font-family:var(--font-serif);font-size:22px;
  font-weight:700;color:var(--navy-900);
}
.approach-steps p{margin:0;font-size:14.5px;color:var(--slate-500);line-height:1.65}

/* Contact */
.contact-grid{
  display:grid;grid-template-columns:1.1fr .9fr;gap:80px;align-items:center;
}
.section-dark .eyebrow{color:var(--teal-400)}
.contact-grid h2{
  font-family:var(--font-serif);font-size:clamp(28px,3.4vw,42px);
  font-weight:700;line-height:1.25;margin:0 0 20px;color:var(--white);
  letter-spacing:-.005em;
}
.contact-lead{
  font-size:16px;line-height:1.75;color:rgba(255,255,255,.72);margin:0;
  max-width:480px;
}
.contact-info{
  background:rgba(255,255,255,.04);
  border:1px solid rgba(255,255,255,.1);
  border-radius:var(--radius-lg);
  padding:36px;
}
.info-row{
  display:flex;align-items:baseline;gap:16px;
  padding:16px 0;border-bottom:1px solid rgba(255,255,255,.08);
}
.info-row:first-child{padding-top:0}
.info-label{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--teal-400);min-width:70px;
}
.info-row a,.info-row span:last-child{color:rgba(255,255,255,.9);font-size:15px}
.info-row a:hover{color:var(--teal-400)}

/* ===== Footer ===== */
.site-footer{
  background:var(--navy-900);
  color:rgba(255,255,255,.55);
  padding:40px 0;
  border-top:1px solid rgba(255,255,255,.08);
}
.footer-grid{
  display:flex;justify-content:space-between;align-items:center;gap:32px;flex-wrap:wrap;
}
.brand-footer{color:var(--white);align-items:center}
.brand-footer .brand-text small{color:rgba(255,255,255,.5)}
.brand-logo-footer{height:40px;filter:brightness(0) invert(1);opacity:.92}
.footer-tag{
  font-family:var(--font-mono);font-size:12px;margin:8px 0 0;
  color:var(--teal-400);letter-spacing:.08em;
}
.site-footer small{font-size:13px;font-family:var(--font-mono)}

/* ===== Responsive ===== */
@media (max-width:960px){
  .hero-grid{grid-template-columns:1fr;gap:48px}
  .hero{padding:64px 0 56px}
  .about-grid{grid-template-columns:1fr;gap:40px}
  .services-grid{grid-template-columns:repeat(2,1fr)}
  .service-card.service-card-wide{grid-column:span 2}
  .equipment-grid{grid-template-columns:1fr}
  .experience-list{grid-template-columns:1fr}
  .experience-list li:nth-child(2){border-top:1px solid var(--line);padding-top:24px}
  .approach-steps{grid-template-columns:repeat(2,1fr)}
  .approach-steps li{border-left:none;border-top:1px solid var(--line)}
  .approach-steps li:nth-child(-n+2){border-top:none}
  .approach-steps li:nth-child(odd){border-left:none}
  .approach-steps li:nth-child(even){border-left:1px solid var(--line)}
  .approach-steps li::before{top:-5px;left:36px}
  .contact-grid{grid-template-columns:1fr;gap:40px}
  .section{padding:80px 0}
}
@media (max-width:600px){
  .nav-links{display:none}
  .services-grid{grid-template-columns:1fr}
  .service-card.service-card-wide{grid-column:span 1}
  .service-list.service-list-2col{grid-template-columns:1fr}
  .equipment-spec{grid-template-columns:1fr}
  .hero-stats{grid-template-columns:1fr;gap:16px}
  .hero h1{font-size:34px}
  .approach-steps{grid-template-columns:1fr}
  .approach-steps li{border-left:none !important;border-top:1px solid var(--line)}
  .approach-steps li:first-child{border-top:none}
  .contact-info{padding:26px}
}