:root{
  --bg:#ffffff; --panel:#f4f4f4; --ink:#171a20; --muted:#5c5e62; --line:#e2e3e5;
  --accent:#3e6ae1; --btn:#171a20; --btn-ink:#ffffff; --art:#171a20;
  --apes:#14a35a; --chem:#6a5ae0; --night:#06110d;
  --font:"Outfit","Helvetica Neue",Arial,sans-serif;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0e0f11; --panel:#17191c; --ink:#f2f3f4; --muted:#9a9ea4; --line:#2a2d31;
  --accent:#6b8ff0; --btn:#f2f3f4; --btn-ink:#0e0f11; --art:#f2f3f4; --apes:#3ddc84; --chem:#9a8cff; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0e0f11; --panel:#17191c; --ink:#f2f3f4; --muted:#9a9ea4; --line:#2a2d31;
  --accent:#6b8ff0; --btn:#f2f3f4; --btn-ink:#0e0f11; --art:#f2f3f4; --apes:#3ddc84; --chem:#9a8cff; color-scheme:dark}
*{box-sizing:border-box}
body{background:var(--bg);color:var(--ink);font-family:var(--font);font-size:17px;line-height:1.55;font-weight:400}
a{color:inherit}
p{margin:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
.wrap{max-width:1180px;margin-inline:auto;padding-left:max(20px,env(safe-area-inset-left,0px));padding-right:max(20px,env(safe-area-inset-right,0px))}
body{overflow-x:clip}
.panel > .wrap{width:100%;min-width:0}
h1,h2,h3{margin:0;font-weight:500;line-height:1.08;text-wrap:balance}

header.nav{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px)}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:30;background:var(--bg)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-block:14px}
.brand{font-weight:600;letter-spacing:.2em;text-transform:uppercase;font-size:.95rem;text-decoration:none}
.nav nav{display:flex;gap:6px;flex-wrap:wrap}
.nav nav a{padding:6px 14px;border-radius:6px;text-decoration:none;font-size:.92rem;font-weight:500}
.nav nav a:hover{background:var(--panel)}

.btn{display:inline-flex;align-items:center;justify-content:center;min-width:220px;padding:11px 28px;border-radius:6px;border:2px solid var(--btn);background:var(--btn);color:var(--btn-ink);font:inherit;font-size:.95rem;font-weight:500;text-decoration:none;cursor:pointer;transition:opacity .2s}
.btn:hover{opacity:.85}
.btn.light{background:transparent;color:var(--ink)}
.btn.light:hover{background:var(--panel);opacity:1}
.btn[aria-disabled="true"]{opacity:.4;pointer-events:none}
.btn.sm{min-width:0;padding:8px 20px;font-size:.9rem}
.actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

.panel{position:relative;display:flex;flex-direction:column;align-items:center;text-align:center;padding-block:72px 56px}
.panel.tall{min-height:min(86vh,820px);justify-content:space-between;overflow:hidden}
.panel.alt{background:var(--panel)}
.panel h1{font-size:clamp(2.6rem,7vw,4.6rem);font-weight:500;letter-spacing:-.02em}
.panel h2{font-size:clamp(2rem,4.5vw,3rem);letter-spacing:-.01em}
.panel .sub{color:var(--muted);margin-top:12px;max-width:52ch;font-size:1.05rem}
.panel .top{position:relative;z-index:1;display:flex;flex-direction:column;align-items:center}
.panel .actions{position:relative;z-index:1;margin-top:40px}
.art{position:absolute;left:50%;bottom:-6%;transform:translateX(-50%);width:min(560px,92vw);opacity:.12;pointer-events:none}
.art path,.art line{stroke:var(--art)}

.split{display:grid;grid-template-columns:1fr 1fr}
.split .panel{padding-block:64px;min-height:440px;justify-content:space-between}
.split .panel + .panel{border-left:1px solid var(--line)}
.course-mark{font-size:.8rem;font-weight:600;letter-spacing:.22em;text-transform:uppercase;color:var(--accent);margin-bottom:12px}

.tabs{display:flex;gap:4px;justify-content:center;margin-top:28px}
.tab{padding:8px 18px;border:0;border-bottom:2px solid transparent;background:none;color:var(--muted);font:inherit;font-weight:500;cursor:pointer}
.tab[aria-pressed="true"]{color:var(--ink);border-bottom-color:var(--ink)}
.list{width:100%;max-width:820px;margin-top:28px;text-align:left;border-top:1px solid var(--line)}
.row{display:grid;grid-template-columns:96px 1fr auto;gap:8px 20px;align-items:center;padding:20px 4px;border-bottom:1px solid var(--line)}
.row[hidden]{display:none}
.rthumb{width:96px;height:96px;object-fit:cover;border-radius:6px;background:var(--panel)}
.row h3{font-size:1.15rem}
.row p{color:var(--muted);font-size:.95rem;margin-top:2px}
.row .tag{font-size:.72rem;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);margin-bottom:4px}
.row > div{min-width:0}

.cells{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:1px;background:var(--line);border:1px solid var(--line);width:100%;max-width:1040px;margin-top:40px;text-align:left}
.cell{background:var(--bg);padding:28px 24px;display:flex;flex-direction:column;gap:8px}
.alt .cell{background:var(--panel)}
.cell h3{font-size:1.2rem}
.cell p{color:var(--muted);font-size:.95rem}

.about p{max-width:60ch;color:var(--muted);margin-top:16px;font-size:1.08rem}

footer{padding-block:40px;font-size:.82rem;color:var(--muted);text-align:center}
footer .wrap{display:flex;flex-direction:column;gap:6px;align-items:center}
footer strong{color:var(--ink);font-weight:600;letter-spacing:.14em;text-transform:uppercase}
footer p{max-width:70ch}

.hero{background:radial-gradient(ellipse at 50% 60%,#0e3a2b 0%,var(--night) 64%);color:#fff}
.hero h1{color:#fff}
.hero .sub{color:#b9cfc4}
.hero .btn{background:#fff;color:#06110d;border-color:#fff}
.hero .btn.light{background:transparent;color:#fff;border-color:rgba(255,255,255,.45)}
.hero .btn.light:hover{background:rgba(255,255,255,.12)}
.hero .actions{margin-top:20px}
.stage{position:relative;z-index:1;width:min(300px,64vw);margin-top:28px}
.stage::before{content:"";position:absolute;inset:-35%;z-index:-1;background:radial-gradient(circle,rgba(61,220,132,.42) 0%,rgba(46,150,200,.2) 36%,transparent 64%);animation:pulse 4s ease-in-out infinite}
.stage svg{display:block;width:100%;filter:drop-shadow(0 0 16px rgba(93,242,168,.65))}
.wave{animation:wave 5s linear infinite}
.wave2{animation:wave 8s linear infinite reverse}
.bub{transform-box:fill-box;transform-origin:center;animation:rise var(--t,4s) ease-in infinite;animation-delay:var(--d,0s);opacity:0}
.spark{position:absolute;bottom:-12px;border-radius:50%;background:#7bf0b0;opacity:0;animation:float var(--t,12s) linear infinite;animation-delay:var(--d,0s);pointer-events:none}
.sparks{position:absolute;inset:0;overflow:hidden;pointer-events:none}
@keyframes pulse{0%,100%{opacity:.75;transform:scale(.96)}50%{opacity:1;transform:scale(1.05)}}
@keyframes wave{to{transform:translateX(-120px)}}
@keyframes rise{0%{transform:translateY(0) scale(.6);opacity:0}15%{opacity:.9}100%{transform:translateY(-95px) scale(1);opacity:0}}
@keyframes float{0%{transform:translateY(0);opacity:0}10%{opacity:.7}100%{transform:translateY(-760px);opacity:0}}
@media (prefers-reduced-motion:reduce){.wave,.wave2,.bub,.spark,.stage::before{animation:none}.bub{opacity:.7}}

.panel.apes{background:linear-gradient(165deg,color-mix(in srgb,var(--apes) 20%,var(--panel)),var(--panel) 70%)}
.panel.chem{background:linear-gradient(165deg,color-mix(in srgb,var(--chem) 20%,var(--panel)),var(--panel) 70%)}
.apes .course-mark,.row .tag.apes{color:var(--apes)}
.chem .course-mark,.row .tag.chem{color:var(--chem)}
.badge{width:72px;height:72px;border-radius:50%;display:grid;place-items:center;margin-bottom:18px;border:2px solid currentColor;background:color-mix(in srgb,currentColor 12%,transparent)}
.badge svg{width:38px;height:38px}
.apes .badge{color:var(--apes)}.chem .badge{color:var(--chem)}
.cell{border-top:3px solid var(--line)}
.cell.apes{border-top-color:var(--apes)}.cell.chem{border-top-color:var(--chem)}.cell.both{border-image:linear-gradient(90deg,var(--apes),var(--chem)) 1}
.cell .thumb{display:block;width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:6px;margin-bottom:6px}
.cell .tag{font-size:.72rem;font-weight:600;letter-spacing:.16em;text-transform:uppercase}
.cell.apes .tag{color:var(--apes)}.cell.chem .tag{color:var(--chem)}.cell.both .tag{color:var(--accent)}
.about{background:radial-gradient(ellipse at 50% 0%,color-mix(in srgb,var(--chem) 14%,transparent),transparent 60%)}

.hero{position:relative;overflow:hidden;padding:0;gap:0}
.track{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;scrollbar-width:none;overscroll-behavior-x:contain;position:relative;z-index:1}
.track::-webkit-scrollbar{display:none}
.track:focus-visible{outline-offset:-4px}
.slide{flex:0 0 100%;scroll-snap-align:start;min-height:min(86vh,820px);display:flex;flex-direction:column;align-items:center;justify-content:space-between;text-align:center;padding:64px max(72px,env(safe-area-inset-right,0px)) 88px max(72px,env(safe-area-inset-left,0px))}
.slide .top{display:flex;flex-direction:column;align-items:center}
.slide .actions{margin-top:20px}
.hero h1{font-size:clamp(2.6rem,7vw,4.6rem);font-weight:500;letter-spacing:-.02em}
.hero h2{color:#fff;font-size:clamp(1.8rem,4vw,2.9rem);letter-spacing:-.01em}
.hero .sub{margin-top:12px;max-width:52ch;font-size:1.05rem}
.slide.preview{flex-direction:row;justify-content:center;gap:56px;text-align:left}
.ptext{max-width:420px;display:flex;flex-direction:column;align-items:flex-start;gap:14px;min-width:0}
.ptext .sub{margin:0}
.ptext .btn{margin-top:10px}
.eyebrow{font-size:.78rem;font-weight:600;letter-spacing:.22em;text-transform:uppercase;color:#7bf5b2}
.pimg{display:block;flex:0 1 auto;min-width:0}
.pimg img{display:block;width:min(480px,40vw);height:auto;aspect-ratio:1;object-fit:cover;border-radius:14px;box-shadow:0 0 0 1px rgba(255,255,255,.14),0 24px 80px rgba(61,220,132,.28);background:#0e3a2b}
.arrow{position:absolute;top:50%;z-index:3;transform:translateY(-50%);width:46px;height:46px;border-radius:50%;border:1.5px solid rgba(255,255,255,.4);background:rgba(6,17,13,.55);color:#fff;display:grid;place-items:center;cursor:pointer;backdrop-filter:blur(6px)}
.arrow:hover{background:rgba(255,255,255,.16)}
.arrow.prev{left:max(14px,env(safe-area-inset-left,0px))}.arrow.next{right:max(14px,env(safe-area-inset-right,0px))}
.dots{position:absolute;z-index:3;left:0;right:0;bottom:30px;display:flex;justify-content:center;gap:10px;pointer-events:none}
.dot{pointer-events:auto;width:9px;height:9px;padding:0;border-radius:50%;border:0;background:rgba(255,255,255,.35);cursor:pointer;transition:width .25s,background .25s}
.dot[aria-current="true"]{width:26px;border-radius:5px;background:#7bf5b2}
.dot:focus-visible,.arrow:focus-visible{outline:2px solid #7bf5b2;outline-offset:3px}
@media (max-width:860px){
  .slide{padding:36px 20px 84px}
  .slide.preview{flex-direction:column-reverse;justify-content:center;gap:24px;text-align:center}
  .ptext{align-items:center;max-width:460px}
  .pimg img{width:min(250px,62vw)}
  .arrow{top:auto;bottom:18px;transform:none;width:40px;height:40px}
  .arrow.prev{left:max(16px,env(safe-area-inset-left,0px))}.arrow.next{right:max(16px,env(safe-area-inset-right,0px))}
  .dots{bottom:30px}
}

@media (max-width:760px){
  .split{grid-template-columns:1fr}
  .split .panel + .panel{border-left:0;border-top:1px solid var(--line)}
  .panel{padding-block:56px 40px}
  .btn{min-width:0;width:100%;max-width:340px}
  .row{grid-template-columns:72px 1fr}
  .rthumb{width:72px;height:72px}
  .row .btn{grid-column:1/-1;width:100%;max-width:none}
  .nav nav a{padding:6px 8px;font-size:.85rem}
  .brand{font-size:.8rem;letter-spacing:.14em}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}
html{color-scheme:light dark}body{margin:0}img{max-width:100%}[hidden]{display:none!important}

/* GFS phone nav: keep the header on one row */
@media (max-width:560px){
  .nav .wrap{padding-block:10px;gap:8px}
  .brand{font-size:.7rem;letter-spacing:.1em;white-space:nowrap}
  .nav nav{gap:0;flex-wrap:nowrap}
  .nav nav a{padding:6px 7px;font-size:.78rem}
  .nav nav a[href$="#about"]{display:none}
}