:root {
  --ink:#24262a; --muted:#666a70; --line:#cfd1d3; --paper:#fff; --soft:#f2f2ef;
  --gray:#4d5156; --deep:#303338; --yellow:#a98212; --yellow-dark:#785f0b; --yellow-soft:#f2e8c5;
  --ok:#256445; --error:#8a3434; --focus:#1769aa; --max:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:86px}
.print-only{display:none}
body{margin:0;background:var(--paper);color:var(--ink);font-family:"Pretendard","Noto Sans KR","Malgun Gothic",sans-serif;font-size:17px;line-height:1.65}
button,input,select{font:inherit}
button,a,select,input{outline-offset:4px}
:focus-visible{outline:3px solid var(--focus)}
a{color:inherit}
h1,h2,h3,p{margin-top:0}
h1{font-size:clamp(3rem,6vw,5.8rem);line-height:1.02;letter-spacing:-.055em;margin-bottom:28px}
h2{font-size:clamp(2rem,3.6vw,3.25rem);line-height:1.18;letter-spacing:-.045em;margin-bottom:0}
h3{line-height:1.3}
.skip-link{position:fixed;top:-80px;left:20px;background:#fff;padding:12px 20px;z-index:1000;border:2px solid var(--deep)}
.skip-link:focus{top:20px}
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line)}
.header-inner{height:76px;max-width:var(--max);margin:auto;padding:0 28px;display:flex;align-items:center;justify-content:space-between;gap:25px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;line-height:1.1}
.brand-mark{width:38px;height:38px;display:grid;place-items:center;background:var(--yellow);color:#fff;font-weight:800;font-size:14px}
.brand strong{display:block;font-size:16px}.brand small{display:block;font-size:10px;letter-spacing:.16em;color:var(--muted);margin-top:5px}
nav{display:flex;gap:26px}nav a{text-decoration:none;font-size:15px;font-weight:700;color:var(--gray)}nav a:hover{color:var(--yellow-dark)}
.menu-toggle{display:none;background:none;border:1px solid var(--line);padding:8px 13px}
.progress-track{height:3px;background:#e6e6e3}.progress-track span{display:block;height:100%;width:0;background:var(--yellow)}
.section{max-width:var(--max);margin:auto;padding:112px 28px}.alt{max-width:none;background:var(--soft);padding-left:max(28px,calc((100% - var(--max))/2 + 28px));padding-right:max(28px,calc((100% - var(--max))/2 + 28px))}
.section-head{display:grid;grid-template-columns:1.25fr .75fr;gap:80px;align-items:end;margin-bottom:60px}.section-head>p{color:var(--muted);margin-bottom:6px}
.section-number,.eyebrow{font-size:13px;letter-spacing:.13em;text-transform:uppercase;font-weight:800;color:var(--yellow-dark);margin-bottom:16px}
.chapter-band{background:var(--yellow);color:#fff;padding:54px max(28px,calc((100% - var(--max))/2 + 28px));display:flex;align-items:center;justify-content:space-between;gap:70px}
.chapter-band>div{display:flex;align-items:center;gap:26px}.chapter-band span{font-size:13px;font-weight:800;letter-spacing:.18em}.chapter-band h2{font-size:2.2rem}.chapter-band p{max-width:460px;margin:0}.chapter-band.dark{background:var(--deep)}
.simulation-tag{display:inline-block!important;width:max-content;padding:5px 10px;border:1px solid var(--yellow);color:var(--yellow-dark)!important;font-size:13px;font-weight:800;letter-spacing:.03em}
.button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:11px 20px;border:2px solid transparent;text-decoration:none;font-weight:800;cursor:pointer;border-radius:0}
.button.primary{background:var(--yellow);color:#fff;border-color:var(--yellow)}.button.primary:hover{background:var(--yellow-dark);border-color:var(--yellow-dark)}
.button.secondary{background:#fff;color:var(--ink);border-color:var(--deep)}.button.secondary:hover{background:var(--soft)}
.button.text-button{background:transparent;border-color:transparent;text-decoration:underline}.button.full{width:100%}.button-row{display:flex;gap:10px;flex-wrap:wrap}
.feedback{min-height:52px;border-left:4px solid var(--gray);background:var(--soft);padding:12px 16px;margin:18px 0;color:var(--gray);font-weight:600}
.feedback.success{border-color:var(--ok);color:var(--ok)}.feedback.error{border-color:var(--error);color:var(--error)}
.notice,.data-disclaimer{font-size:14px;color:var(--muted)}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}