:root{--night:#07101e;--navy:#102038;--panel:#162842;--paper:#f7f9f8;--ink:#142635;--muted:#63727c;--line:#d4dfdc;--teal:#2bb98f;--teal-dark:#176e5d;--blue:#76aef5;--white:#fff}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:1.5rem}body{margin:0;background:var(--night);color:var(--ink);font:17px/1.72 Georgia,"Times New Roman",serif}.guide-hero{display:grid;grid-template-columns:220px minmax(0,850px);gap:34px;align-items:center;max-width:1240px;margin:auto;padding:40px 5vw;color:var(--white)}.guide-hero img{display:block;width:210px;height:auto}.eyebrow,.chapter-number,.rail-title,.mobile-contents label{font:700 .74rem/1.2 Arial,sans-serif;letter-spacing:.15em;text-transform:uppercase;color:var(--teal)}h1,h2,h3{font-family:Arial,sans-serif}h1{max-width:760px;margin:.4rem 0 .7rem;font-size:clamp(2.2rem,5vw,4.8rem);line-height:.98;letter-spacing:-.04em}.guide-hero p{max-width:760px;margin:0;color:#acbbca;font-family:Arial,sans-serif}.guide-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}.button{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:10px 17px;border:1px solid var(--teal);border-radius:7px;font:700 .9rem/1.2 Arial,sans-serif;text-decoration:none}.button-primary{background:var(--teal);color:#061711}.button-quiet{color:var(--white)}.guide-layout{display:grid;grid-template-columns:280px minmax(0,820px);gap:42px;max-width:1240px;margin:auto;padding:0 5vw 70px}.chapter-rail{position:sticky;top:20px;align-self:start;max-height:calc(100vh - 40px);overflow:auto;padding:22px;background:var(--panel);border:1px solid #29405d;border-radius:10px}.rail-title{margin-bottom:12px}.chapter-link{display:grid;grid-template-columns:27px 1fr;gap:8px;padding:7px 0;border-bottom:1px solid #29405d;color:#c2cfdb;font:500 .79rem/1.35 Arial,sans-serif;text-decoration:none}.chapter-link span{color:var(--teal)}.chapter-link:hover,.chapter-link:focus{color:var(--white)}.reading-column{min-width:0;padding:34px 46px 55px;background:var(--paper);border-radius:12px;box-shadow:0 24px 80px #0006}.start-note{margin-bottom:42px;padding:18px 20px;border-left:4px solid var(--teal);background:#e9f3f0;font-family:Arial,sans-serif}.guide-chapter{padding:12px 0 44px;border-bottom:1px solid var(--line);scroll-margin-top:1.5rem}.guide-chapter+.guide-chapter{padding-top:44px}.guide-chapter h2{margin:.35rem 0 .2rem;font-size:clamp(1.8rem,4vw,2.8rem);line-height:1.08;letter-spacing:-.025em}.chapter-dek{margin:.2rem 0 2rem;color:var(--teal-dark);font:600 1.04rem/1.5 Arial,sans-serif}.guide-chapter section{scroll-margin-top:1.5rem}.guide-chapter h3{margin:1.8rem 0 .35rem;color:#275d86;font-size:1.13rem}.guide-chapter p{margin:.35rem 0 .85rem}.guide-chapter a:not(.back-to-top){color:#145f8b;overflow-wrap:anywhere}.back-to-top{display:inline-block;margin-top:1rem;color:var(--teal-dark);font:700 .78rem Arial,sans-serif}.guide-footer{padding:48px 0 8px}.guide-footer h2{font-size:2rem;margin:0}.guide-footer p{max-width:650px}.mobile-contents{display:none}.button:focus,.chapter-link:focus,.back-to-top:focus,select:focus{outline:3px solid var(--blue);outline-offset:3px}@media(max-width:850px){.guide-hero{grid-template-columns:1fr;padding:26px 6vw 30px}.guide-hero img{width:165px}.guide-layout{display:block;padding:0 0 40px}.chapter-rail{display:none}.mobile-contents{display:block;position:sticky;top:0;z-index:2;padding:12px 6vw;background:var(--navy);color:var(--white)}.mobile-contents label{display:block;margin-bottom:6px}.mobile-contents select{width:100%;padding:10px;border:1px solid #38516d;border-radius:6px;background:var(--panel);color:var(--white);font:inherit}.reading-column{padding:28px 6vw 45px;border-radius:0}.guide-chapter{scroll-margin-top:90px}}@media(max-width:520px){body{font-size:16px}.guide-actions{display:grid}.button{width:100%;text-align:center}.reading-column{padding-left:5vw;padding-right:5vw}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}