:root{--ink:#071724;--navy:#0a2538;--ice:#d9eef2;--paper:#f6f2e9;--gold:#f3b33d;--red:#df5a45;--muted:#62717a;--line:rgba(7,23,36,.16);--accent:#f3b33d}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.7 Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}a{color:inherit}.skip{position:absolute;left:-999px;top:1rem;background:white;padding:.7rem 1rem;z-index:30}.skip:focus{left:1rem}.nav-wrap{background:var(--ink);color:white;position:relative;z-index:10}.nav{max-width:1200px;margin:auto;padding:1.15rem 2rem;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:.7rem;text-decoration:none;font-weight:800}.mark{width:34px;height:34px;border:1px solid rgba(255,255,255,.5);border-radius:50%;display:grid;place-items:center}.nav nav{display:flex;gap:1.35rem}.nav nav a{text-decoration:none;font-size:.88rem;font-weight:700}.nav nav a:hover,.nav nav a[aria-current="page"]{color:var(--gold)}.menu{display:none;background:transparent;color:white;border:1px solid rgba(255,255,255,.5);padding:.5rem .7rem;font:inherit}
.hero{min-height:66vh;background:linear-gradient(120deg,#071724,#24475a 68%,#5b8995);color:white;display:flex;align-items:flex-end;position:relative}.hero:after{content:"";position:absolute;inset:auto 0 0;height:35%;background:linear-gradient(transparent,var(--ink))}.hero-inner{width:min(1200px,calc(100% - 4rem));margin:auto;padding:8rem 0 5rem;position:relative;z-index:2}.eyebrow{text-transform:uppercase;letter-spacing:.17em;font-size:.76rem;font-weight:850;color:var(--accent)}h1,h2,h3{font-family:Georgia,"Times New Roman",serif}.hero h1{font-size:clamp(3.6rem,8vw,7.8rem);line-height:.88;letter-spacing:-.055em;margin:.5rem 0 1rem;max-width:980px}.hero p{font-size:clamp(1.05rem,2vw,1.3rem);max-width:720px;color:#d8e5e8}.content{width:min(1200px,calc(100% - 4rem));margin:auto;padding:6rem 0}.lead-grid{display:grid;grid-template-columns:.72fr 1.28fr;gap:8vw}.lead-grid h2{font-size:clamp(2.4rem,4.6vw,4.6rem);line-height:1;letter-spacing:-.04em;margin:.45rem 0}.lead{font-size:1.25rem;color:#334953}.facts{display:grid;grid-template-columns:repeat(4,1fr);margin:3.5rem 0;border:1px solid var(--line)}.fact{padding:1.25rem;border-right:1px solid var(--line)}.fact:last-child{border-right:0}.fact b{display:block;font-size:.7rem;letter-spacing:.12em;text-transform:uppercase}.fact span{font:1.1rem Georgia,serif}.story{background:white}.story-inner{width:min(980px,calc(100% - 4rem));margin:auto;padding:6rem 0}.story h2{font-size:clamp(2.2rem,4vw,3.8rem);line-height:1;margin:0 0 2rem}.chapters{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);margin-top:3rem}.chapters article{background:white;padding:1.6rem}.chapters b{display:block;color:var(--red);font-size:.75rem;text-transform:uppercase;letter-spacing:.12em}.chapters h3{font-size:1.45rem;margin:.45rem 0}.next{background:var(--accent)}.next-inner{width:min(1200px,calc(100% - 4rem));margin:auto;padding:4rem 0;display:flex;justify-content:space-between;gap:2rem;align-items:center}.next h2{font-size:clamp(2rem,4vw,3.8rem);line-height:1;margin:.4rem 0}.button{display:inline-flex;padding:.85rem 1.1rem;background:var(--ink);color:white;text-decoration:none;font-weight:800;white-space:nowrap}footer{background:var(--ink);color:white}.footer{width:min(1200px,calc(100% - 4rem));margin:auto;padding:2.5rem 0;display:flex;justify-content:space-between;gap:1rem}.footer a{color:var(--gold);text-decoration:none}.footer p{margin:0;color:#a9bcc3}
body[data-page="north-pole"] .hero{background-image:linear-gradient(90deg,rgba(3,19,30,.92),rgba(3,19,30,.22)),url('assets/north-pole.jpg');background-position:center 44%}
body[data-page="amazon"] .hero{background-image:linear-gradient(90deg,rgba(3,19,30,.90),rgba(3,19,30,.20)),url('assets/amazon.jpg')}
body[data-page="oceans"] .hero{background-image:linear-gradient(90deg,rgba(3,19,30,.88),rgba(3,19,30,.15)),url('assets/oceans.jpg');background-position:center 46%}
body[data-page="kilimanjaro"] .hero{background-image:linear-gradient(90deg,rgba(3,19,30,.92),rgba(3,19,30,.18)),url('assets/kilimanjaro.jpg');background-position:center 38%}
body[data-page="oceans"]{--accent:#35b9c7}body[data-page="amazon"]{--accent:#7fbc7a}body[data-page="alaska"]{--accent:#9fd2e0}body[data-page="fuji"]{--accent:#f08b55}body[data-page="antarctica"]{--accent:#d7edf1}
@media(max-width:800px){.nav{padding:1rem 1.1rem}.menu{display:block}.nav nav{display:none;position:absolute;top:65px;left:1rem;right:1rem;background:var(--ink);padding:1rem;flex-direction:column}.nav nav.open{display:flex}.hero-inner,.content,.story-inner,.next-inner,.footer{width:min(100% - 2.2rem,1200px)}.hero-inner{padding:6rem 0 4rem}.hero h1{font-size:3.8rem}.lead-grid{grid-template-columns:1fr;gap:1rem}.facts{grid-template-columns:1fr 1fr}.fact:nth-child(2){border-right:0}.fact:nth-child(-n+2){border-bottom:1px solid var(--line)}.chapters{grid-template-columns:1fr}.next-inner,.footer{align-items:flex-start;flex-direction:column}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* Shared navigation and archive pages */
.nav{max-width:1440px;gap:1.5rem;flex-wrap:wrap}.nav nav{gap:.8rem 1.15rem;flex-wrap:wrap}.nav nav a{font-size:.9rem}.hero{background-size:cover}.archive-hero{min-height:0}.archive-hero .hero-inner{padding:4rem 0}.archive-hero h1{font-size:clamp(3rem,7vw,6rem);line-height:1.05}.archive-section{max-width:1000px;margin:auto;padding:3rem 0}.archive-section h2{font-size:2.25rem;line-height:1.2}.archive-list{list-style:none;padding:0}.archive-list li{border-top:1px solid var(--line);padding:1.4rem 0}.archive-list h3{font-size:1.4rem;line-height:1.35;margin:.3rem 0}.archive-list p{margin:.4rem 0}.meta{color:#52636d;font-size:.9rem}.resource-grid{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem}.resource-grid article{border:1px solid var(--line);padding:1.5rem;background:white}.resource-grid h3{font-size:1.5rem;margin-top:0}.resource-grid a{display:block;margin:.8rem 0}.archive-note{padding:1.25rem;background:#e4ebeb}.nav a:focus-visible,.button:focus-visible{outline:3px solid var(--gold);outline-offset:5px}
@media(max-width:1100px){.nav{padding:1rem 1.1rem}.menu{display:block}.nav nav{display:none;position:absolute;top:100%;left:1rem;right:1rem;background:var(--ink);padding:1rem;flex-direction:column;max-height:75vh;overflow:auto}.nav nav.open{display:flex}.nav nav a{padding:.3rem 0}}
@media(max-width:600px){.resource-grid{grid-template-columns:1fr}.archive-section{padding:1.5rem 0}.hero h1{font-size:clamp(2.8rem,12vw,3.8rem)}.button{white-space:normal}}