:root{--navy:#002846;--navy2:#003b64;--blue:#075a8c;--yellow:#ffc51c;--orange:#ff8a00;--text:#202a34;--muted:#697580;--light:#f5f7f9;--max:1160px}
*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:Arial,Helvetica,sans-serif;color:var(--text);line-height:1.6}a{text-decoration:none;color:inherit}.container{width:min(92%,var(--max));margin:auto}
.site-header{height:76px;background:var(--navy);color:#fff;border-bottom:2px solid var(--yellow);position:sticky;top:0;z-index:20}.navbar{height:100%;display:flex;align-items:center;justify-content:space-between;gap:25px}.brand{font-weight:900;line-height:.9}.brand span,.brand strong,.brand small{display:block}.brand span{font-size:.7rem}.brand strong{font-size:1.35rem;color:var(--yellow)}.brand small{font-size:.47rem;letter-spacing:1px;color:#b9cbd7;margin-top:5px}nav ul{display:flex;list-style:none;gap:19px}nav a{font-size:.73rem;font-weight:900;text-transform:uppercase}nav a:hover{color:var(--yellow)}.menu-button{display:none;background:none;border:0;color:#fff;font-size:1.7rem}
.page-hero{background:radial-gradient(circle at 82% 35%,rgba(7,90,140,.6),transparent 25%),linear-gradient(135deg,#001d34,#003b64);color:#fff;padding:85px 0}.eyebrow,.label{color:var(--yellow);font-size:.7rem;letter-spacing:2px;font-weight:900}.page-hero h1{font-size:clamp(3rem,6vw,5.6rem);line-height:.95;letter-spacing:-3px;margin:12px 0 22px}.page-hero p{max-width:780px;color:#d6e4ec;font-size:1.08rem}
.content{padding:80px 0 100px;background:#f7f9fa}.grid{display:grid;gap:20px}.cards4{grid-template-columns:repeat(4,1fr)}.cards3{grid-template-columns:repeat(3,1fr)}
.feature,.download-card,.source-card{background:#fff;border:1px solid #dfe5e9;border-radius:16px;padding:28px;transition:.2s}.feature:hover{transform:translateY(-4px);border-color:var(--yellow)}.feature>b{font-size:2rem;color:var(--navy)}.feature h3,.download-card h3,.source-card h3{color:var(--navy);margin:12px 0 8px;line-height:1.2}.feature p,.download-card p,.source-card p{color:var(--muted);font-size:.9rem}.feature span{display:inline-block;color:var(--orange);font-weight:900;font-size:.75rem;margin-top:18px}
.notice{background:#edf6fb;border-left:5px solid var(--blue);padding:25px 28px;border-radius:8px;margin-bottom:35px}.notice.warning{border-color:var(--yellow);background:#fff9e7}.notice strong{color:var(--navy);font-size:1.1rem}.notice p{color:var(--muted);margin-top:5px}
.chapter-list{display:grid;grid-template-columns:1fr 1fr;gap:10px}.chapter-list a{background:#fff;border:1px solid #e0e5e9;border-radius:10px;padding:17px;display:grid;grid-template-columns:auto 1fr auto;gap:15px;align-items:center}.chapter-list a:hover{border-color:var(--yellow)}.chapter-list b{color:#b7c2ca;font-size:1.3rem}.chapter-list span{color:var(--navy);font-weight:800}.chapter-list i{font-style:normal;color:var(--orange);font-size:.72rem;font-weight:900}
.download-card>span{color:var(--orange);font-size:.65rem;font-weight:900;letter-spacing:1.5px}.download-card button{margin-top:20px;padding:8px 12px;border:0;border-radius:6px;background:#e8ecef;color:#89929a;font-weight:800}.source-card>b{display:inline-block;background:var(--navy);color:var(--yellow);padding:5px 10px;border-radius:5px}.source-card>span{display:block;margin-top:18px;color:#929aa0;font-size:.72rem}.verification,.update-example{margin-top:35px;background:#fff;border:1px solid #dfe5e9;border-radius:15px;padding:28px}.verification>span,.update-example>span,.errata-model>span{color:var(--orange);font-size:.65rem;font-weight:900;letter-spacing:1.5px}.verification h3,.update-example h3{color:var(--navy);margin:5px 0}.verification p,.update-example p{color:var(--muted)}.update-example time{color:#89939a;font-size:.75rem}
.errata-model{background:#fff;border:1px solid #dfe5e9;border-radius:15px;padding:28px;display:grid;grid-template-columns:auto repeat(3,1fr);gap:25px;align-items:start}.errata-model b{color:var(--navy)}.errata-model p{color:var(--muted);font-size:.85rem;margin-top:5px}
.author-box{background:#fff;border-radius:20px;padding:45px;display:grid;grid-template-columns:220px 1fr;gap:50px;align-items:start;border:1px solid #dfe5e9}.author-mark{width:190px;height:190px;border-radius:50%;background:linear-gradient(145deg,var(--navy),var(--blue));color:var(--yellow);display:grid;place-items:center;font-size:3rem;font-weight:900;letter-spacing:3px}.author-box h2{color:var(--navy);font-size:2.4rem;line-height:1.1;margin:8px 0 20px}.author-box p{color:var(--muted);margin-bottom:15px}.author-box blockquote{border-left:4px solid var(--yellow);padding:16px 20px;background:#f4f8fa;color:var(--navy);font-weight:900;margin-top:25px}
footer{background:#001d33;color:#c7d4dc;padding:50px 0 24px}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:50px}.footer-grid h3{color:#fff;margin-bottom:10px}.footer-grid a{display:block;margin:5px 0}.footer-grid a:hover{color:var(--yellow)}.copyright{border-top:1px solid rgba(255,255,255,.12);margin-top:35px;padding-top:20px;text-align:center;font-size:.72rem}
@media(max-width:950px){.cards4,.cards3{grid-template-columns:repeat(2,1fr)}.chapter-list{grid-template-columns:1fr}.author-box{grid-template-columns:1fr}.errata-model{grid-template-columns:1fr}}
@media(max-width:760px){nav ul{display:none;position:absolute;top:76px;left:0;right:0;background:var(--navy);padding:25px;flex-direction:column}.menu-button{display:block}nav ul.open{display:flex}.cards4,.cards3,.footer-grid{grid-template-columns:1fr}.page-hero h1{letter-spacing:-2px}}