/* Learning center: warm paper, restrained copper and a compact subject shelf. */
:root{--bg:#211e1b;--surface:#2d2823;--line:#494037;--line2:#6b5b4c;--ink:#f2eadd;--muted:#c3b7a8;--soft:#aa9a87;--accent:#dda579;--accent2:#dba56a;--mask:#100e0cd9;--shadow:0 18px 40px #0003}
html[data-theme="light"]{--bg:#f8f6f0;--surface:#fffdf8;--line:#e5dfd3;--line2:#c6b39b;--ink:#393229;--muted:#776c5d;--soft:#887968;--accent:#9b542f;--accent2:#ac6b3f;--mask:#302a2466;--shadow:0 18px 40px #4c39251a}
html{scroll-behavior:smooth;scroll-padding-top:110px}body{background:var(--bg)}
.nav{max-width:1120px;padding:22px 36px;background:var(--bg);border:0}.brand{font-family:inherit;font-size:17px;letter-spacing:.03em}.mark{width:35px;height:35px;background:var(--ink);color:var(--bg);border-radius:10px;font-size:19px}.navTag{font-family:inherit;font-size:10px;letter-spacing:.15em}.navRight{margin-left:auto}.theme{border-radius:50%;width:36px;height:36px;color:var(--muted)}
.intro{position:relative;max-width:1048px;display:grid;grid-template-columns:1.5fr 1fr;align-items:center;text-align:left;padding:42px 48px;margin:22px auto 44px;min-height:300px;border:1px solid var(--line);border-radius:24px;overflow:hidden;background:var(--surface)}
.intro-kicker{color:var(--accent);font-size:12px;font-weight:600;letter-spacing:.15em}.intro h1{margin:18px 0;font-size:clamp(34px,4.2vw,52px);font-weight:600;letter-spacing:-.04em;line-height:1.25}.title-dot{color:var(--accent)}.intro p{margin:0;color:var(--muted);font-size:15px;line-height:1.9;max-width:none}.explore{display:inline-flex;align-items:center;gap:30px;margin-top:24px;color:var(--ink);text-decoration:none;font-size:13px;font-weight:600}.explore span{color:var(--accent);font-size:21px}
.intro-art{height:240px;position:relative;display:grid;place-items:center;isolation:isolate}.art-orbit{position:absolute;width:230px;height:120px;border:1px solid #bd8b4d77;border-radius:50%;transform:rotate(-30deg)}.art-orbit.second{transform:rotate(55deg);width:205px;height:128px}.art-orbit:after{content:"";position:absolute;width:14px;height:14px;border-radius:50%;background:#c79757;left:25px;top:0;box-shadow:0 5px 10px #77573520}.art-sphere{width:110px;height:110px;border-radius:50%;background:radial-gradient(circle at 30% 27%,#fff5d9,#d2ae76 57%,#9b7144);box-shadow:18px 25px 35px #7f603027;position:relative}.art-label{position:absolute;bottom:0;font-size:10px;letter-spacing:.3em;color:var(--soft)}
.gallery{max-width:1120px;padding:0 36px 64px}.filters{justify-content:flex-end;border:0;margin:0 0 24px;padding:0;gap:5px}.filterLabel{margin-right:auto;font-size:18px;font-family:"Songti SC",serif;font-weight:700;color:var(--ink)}.filterLabel:after{content:" / SUBJECTS";font:10px sans-serif;letter-spacing:.13em;color:var(--soft);margin-left:12px}.chip{border:0;border-radius:7px;padding:8px 14px;font-size:12px}.chip.active{background:var(--ink);color:var(--bg);font-weight:500}.wall{gap:28px}.subject{padding:18px 18px 20px;border:1px solid var(--line);border-radius:17px;background:var(--surface);transition:border-color .2s,transform .2s}.subject:hover{border-color:var(--line2);transform:translateY(-3px)}.subject .cover{width:76%;margin:12px auto 24px;border-radius:3px;box-shadow:5px 10px 18px #30241720}.subject:hover .cover{transform:none;box-shadow:6px 12px 22px #30241730}.subject h2{font-size:17px;margin:0;line-height:1.5}.subject h2:after{content:"↗";float:right;font:17px sans-serif;color:var(--accent);margin-top:4px}.subject[data-state="planned"] h2:after{content:"…"}.physicsLabel{font-size:clamp(28px,4vw,44px)}.orbit,.orbit:before,.orbit:after{display:none}.physicsLabel{display:none}.foot{max-width:1048px;margin:auto;padding:24px 0 32px;font-size:11px;line-height:1.7;letter-spacing:.04em}.close{background:var(--surface);border:1px solid var(--line);color:var(--ink)}
a:focus-visible,button:focus-visible,.subject:focus-visible{outline:2px solid var(--accent);outline-offset:4px}
@media(max-width:720px){.nav{padding:18px 22px}.navTag{display:none}.intro{margin:12px 22px 32px;padding:30px;grid-template-columns:1fr .65fr;min-height:260px}.intro h1{font-size:34px}.intro p{font-size:13px}.intro-art{transform:scale(.7);transform-origin:center;height:220px}.gallery{padding:0 22px 40px}.wall{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.subject{padding:12px 10px 14px;border-radius:12px}.subject .cover{width:85%;margin:20px auto 16px}.subject h2{font-size:13px}.subject h2:after{display:none}.foot{margin:0 22px}.filterLabel{font-size:16px}.filterLabel:after{display:none}}
@media(max-width:480px){.brand{font-size:15px}.intro{padding:25px;display:block;min-height:0}.intro-copy{position:relative;z-index:1}.intro h1{font-size:32px}.intro-art{position:absolute;right:-90px;top:-38px;opacity:.18;transform:scale(.85)}.intro p{max-width:24ch}.intro-kicker{font-size:10px}.explore{margin-top:17px}.filters{gap:2px;flex-wrap:nowrap}.chip{font-size:11px;padding:7px 9px}.wall{gap:9px}.subject{padding:10px 6px 12px}.subject h2{font-size:11px}.physicsLabel{font-size:22px}.subject .cover{width:90%}}
/* Full-bleed subject covers; only the title retains an inset. */
.subject{padding:0;overflow:hidden}
.subject .cover{width:100%;margin:0;border-radius:0;box-shadow:none}
.subject:hover .cover{box-shadow:none}
.subject h2{padding:16px 18px}
@media(max-width:720px){.subject h2{padding:12px 10px}}
@media(max-width:480px){.subject h2{padding:10px 7px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important}}