:root{color-scheme:light;--bg:#f6f4ed;--ink:#283e3b;--muted:#667671;--line:#d2dad2;--gold:#8c7054;--panel:#fffefa}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:radial-gradient(ellipse at 50% -12%,#e6ede5 0%,#faf8f3 44%,var(--bg) 90%);color:var(--ink);font-family:Georgia,'Times New Roman',serif}a{color:inherit}a:focus-visible,summary:focus-visible{outline:2px solid #426e63;outline-offset:4px}.top{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:72px;padding:15px max(5vw,22px);border-bottom:1px solid #cbd8cf}.brand{font:600 15px/1.2 Arial,sans-serif;letter-spacing:.19em}.small{font:11px/1.5 Arial,sans-serif;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}.controls{display:flex;align-items:center;gap:20px;flex-wrap:wrap}.lang{display:flex;gap:5px}.lang a{color:#536b63;font:12px Arial,sans-serif;padding:8px 6px;text-decoration:none}.lang .on{color:#7e6043;border-bottom:2px solid var(--gold);font-weight:700}.back{color:#4e6c62;font:12px Arial,sans-serif}.hero{text-align:center;padding:82px 20px 74px;max-width:980px;margin:auto}.eyebrow{font:11px Arial,sans-serif;letter-spacing:.25em;color:var(--gold);text-transform:uppercase}h1{font-size:clamp(46px,8vw,98px);font-weight:400;letter-spacing:-.045em;margin:25px 0 16px}h1 span{color:var(--gold)}.sub{color:var(--muted);font:15px/1.7 Arial,sans-serif;letter-spacing:.03em}.rule{width:46px;height:1px;background:var(--gold);margin:35px auto}.intro{max-width:710px;margin:20px auto;color:#4c655d;font-size:clamp(17px,2.2vw,21px);line-height:1.7}.root{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:36px max(20px,10vw);text-align:center;background:#e7efe8a0}.root strong{display:block;font:11px Arial;letter-spacing:.18em;text-transform:uppercase;color:var(--gold);margin-bottom:15px}.root p{font-size:19px;line-height:1.65;max-width:790px;margin:auto}.main{max-width:1100px;margin:0 auto;padding:76px 24px 120px}.sectiontop{text-align:center;margin-bottom:35px}.sectiontop h2{font-weight:400;font-size:38px;margin:13px 0}.sectiontop p{color:var(--muted);font:13px Arial,sans-serif}.list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.tile{background:linear-gradient(143deg,#fffefa,#edf3ec);border:1px solid #c8d7cd;color:var(--ink);min-width:0;scroll-margin-top:20px}.tile summary{list-style:none;display:flex;flex-direction:column;justify-content:space-between;min-height:205px;padding:23px;cursor:pointer}.tile summary::-webkit-details-marker{display:none}.tile summary:hover{background:#eef3ed}.tile[open]{grid-column:1/-1;background:#fffefa;border-color:#8ca79a}.tile[open] summary{min-height:0;padding:23px 26px;background:#eaf0e9}.num{font:12px Arial,sans-serif;color:var(--gold);letter-spacing:.08em}.tile h3{font-size:23px;line-height:1.22;font-weight:400;margin:18px 0 22px}.tile[open] h3{font-size:clamp(26px,3vw,39px);margin:8px 0}.more{font:11px Arial,sans-serif;color:#688579;letter-spacing:.1em;text-transform:uppercase}.detail{padding:30px 26px 36px}.detailcols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px}.detail h4{font:11px Arial,sans-serif;color:var(--gold);letter-spacing:.1em;text-transform:uppercase;margin:0 0 15px}.detailcols p{font-size:17px;line-height:1.65;margin:0}.footnote{border-top:1px solid var(--line);padding-top:24px;margin-top:30px;color:var(--muted);font:12px/1.7 Arial,sans-serif}.quote{border-left:1px solid var(--gold);padding-left:15px;margin:18px 0;font-style:italic;font-size:17px;line-height:1.55;color:var(--ink)}.footer{border-top:1px solid var(--line);text-align:center;padding:48px 20px 60px}.footer p{max-width:720px;margin:20px auto;line-height:1.65;color:var(--muted)}.jump{display:inline-block;margin-top:18px;padding:10px 15px;border:1px solid var(--line);text-decoration:none;font:12px Arial,sans-serif}@media(max-width:850px){.list{grid-template-columns:repeat(2,minmax(0,1fr))}.detailcols{grid-template-columns:1fr;gap:24px}.controls{gap:10px}}@media(max-width:560px){.top{flex-direction:column;padding:18px}.hero{padding:60px 22px}.list{grid-template-columns:1fr}.tile summary{min-height:145px}.tile h3{margin:10px 0 20px}.main{padding:45px 18px}.root{padding:30px 20px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* Philosophy 18: additive rules; original layout and navigation are retained. */
.philosophy-pair{padding:6px 0 24px;margin-bottom:22px;border-bottom:1px solid var(--line)}
.philosophy-pair:last-child{margin-bottom:0;border-bottom:none}
.pair-index{font:12px Arial,sans-serif;letter-spacing:.1em;color:var(--gold);margin-bottom:9px}
.detail .pair-question{font:400 clamp(19px,2.1vw,26px)/1.4 Georgia,serif;letter-spacing:0;color:var(--ink);text-transform:none;margin:0 0 15px}
.philosophy-pair .quote{max-width:850px;margin:0;line-height:1.7}
.closing{max-width:900px;margin:0 auto 100px;padding:48px 30px;border-top:1px solid var(--line);text-align:center}
.closing h2{font-size:clamp(27px,4vw,42px);font-weight:400}
.closing p{font-size:18px;line-height:1.75;margin:22px auto;max-width:760px}

/* RU approved introduction: subtitle and distinct seed emphasis; additive only. */
.hero .sub{max-width:780px;margin:18px auto 0;font:400 clamp(17px,2vw,21px)/1.65 Georgia,serif;letter-spacing:0;color:var(--ink)}
.hero .seed-statement{max-width:800px;margin:24px auto 12px;font:italic 400 clamp(18px,2.2vw,23px)/1.7 Georgia,serif;color:#426156}
.hero .seed-statement strong{font-weight:600}