:root{--navy:#1B3563;--navy-deep:#101F3C;--navy-mid:#2E5395;--ink:#26303F;--muted:#6B7686;--faint:#93A0B4;--paper:#F4F6F9;--surface:#FFFFFF;--line:#E2E7EF;--line-soft:#EDF0F5;--accent:#C9861F;--accent-deep:#A96D0F;--accent-soft:#FFF6E1;--ok:#1F7A4D;--disp:"Chakra Petch","Sarabun",sans-serif;--body:"Sarabun",sans-serif;--mono:"IBM Plex Mono",monospace;--sidebar-w:300px;--rail-w:224px;--top-h:58px}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--body);color:var(--ink);background:var(--paper);font-size:16.5px;line-height:1.7}button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}html{scroll-behavior:auto}}.topbar{position:fixed;inset:0 0 auto 0;height:var(--top-h);background:var(--navy-deep);color:#fff;display:flex;align-items:center;gap:14px;padding:0 18px;z-index:60;box-shadow:0 1px #ffffff14,0 2px 12px #101f3c40}.brand{display:flex;align-items:center;gap:10px;font-family:var(--disp);font-weight:700;font-size:17px;letter-spacing:.4px;white-space:nowrap}.brand .glyph{width:30px;height:30px;border-radius:7px;background:linear-gradient(135deg,var(--navy-mid),var(--navy));display:grid;place-items:center;font-size:13px;font-weight:700;color:#fff;border:1px solid rgba(255,255,255,.25)}.brand small{font-family:var(--mono);font-weight:400;font-size:10.5px;color:#9db0d6;letter-spacing:1.5px;display:block;line-height:1}.menu-btn{display:none;width:38px;height:38px;border-radius:8px;color:#fff;font-size:20px;line-height:1}.menu-btn:hover{background:#ffffff1f}.searchbtn{margin-left:auto;display:flex;align-items:center;gap:10px;background:#ffffff1a;border:1px solid rgba(255,255,255,.2);color:#c9d4e8;border-radius:9px;padding:7px 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var(--top-h));overflow-y:auto;background:var(--surface);border-right:1px solid var(--line);padding:18px 14px 40px}.sb-cat{font-family:var(--mono);font-size:10px;letter-spacing:1.6px;color:var(--faint);margin:18px 6px 6px;padding-bottom:5px;border-bottom:1px solid var(--line-soft)}.sb-cat:first-child{margin-top:2px}.homecat{font-family:var(--disp);font-weight:700;font-size:15px;color:var(--navy);margin:30px 0 2px;display:flex;align-items:center;gap:10px}.homecat:before{content:"";width:9px;height:9px;background:var(--accent);border-radius:2px;transform:rotate(45deg)}.homecat small{font-family:var(--mono);font-weight:400;font-size:10.5px;color:var(--faint);letter-spacing:1px}.sb-book{margin-bottom:6px}.sb-bookbtn{width:100%;text-align:left;display:flex;align-items:center;gap:10px;padding:10px;border-radius:9px;transition:background .15s}.sb-bookbtn:hover{background:var(--line-soft)}.sb-bookbtn .tag{font-family:var(--mono);font-size:10px;color:var(--navy-mid);background:#eef2fa;border:1px 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