/* Joshua Bettles — personal research website */
:root{--bg:#18181c;--bg-deep:#111114;--panel:#222227;--panel-soft:#29292f;--purple:#b91c1c;--purple-light:#ef4444;--accent:#f87171;--text:#f2f2f4;--soft:#c7c7cd;--muted:#9999a3;--line:rgba(255,255,255,.11);--width:1120px}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:90px}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.75 "Segoe UI",Roboto,Helvetica,Arial,sans-serif}
a{color:var(--accent);text-decoration:none;transition:color .2s,background .2s,border-color .2s}
a:hover{color:#fca5a5}
img{max-width:100%;display:block}
.container{width:min(var(--width),calc(100% - 48px));margin:0 auto}
.site-header{position:sticky;top:0;z-index:1000;background:rgba(17,17,20,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}
.nav-inner{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;flex-direction:column;color:#fff;font-weight:750;font-size:1.08rem;line-height:1.2;letter-spacing:.01em;white-space:nowrap}
.brand small{color:var(--muted);font-size:.72rem;font-weight:500;letter-spacing:.04em;margin-top:5px}
.nav-links{display:flex;align-items:center;gap:5px;flex-wrap:wrap}
.nav-links a{display:inline-flex;align-items:center;min-height:72px;padding:0 13px;border-bottom:3px solid transparent;color:var(--soft);font-size:.9rem;font-weight:600}
.nav-links a:hover,.nav-links a.current{color:#fff;background:rgba(239,68,68,.12);border-bottom-color:var(--purple-light)}
.menu-toggle{display:none}
.hero{position:relative;isolation:isolate;overflow:hidden;min-height:560px;display:flex;align-items:center;background:#101014}
.hero::before{content:"";position:absolute;inset:0;z-index:-2;background-image:linear-gradient(90deg,rgba(12,12,16,.95) 0%,rgba(12,12,16,.83) 52%,rgba(12,12,16,.45) 100%),url("images/cool-robot-photo-1036x1554.jpg");background-size:cover;background-position:center 42%;opacity:.95}
.hero::after{content:"";position:absolute;inset:auto 0 0;height:110px;z-index:-1;background:linear-gradient(transparent,var(--bg))}
.hero-content{padding:90px 0 105px;max-width:780px}
.eyebrow{color:var(--accent);font-size:.78rem;font-weight:800;letter-spacing:.19em;text-transform:uppercase;margin:0 0 16px}
h1,h2,h3{line-height:1.17;color:#fff}
h1{font-size:clamp(2.8rem,7vw,5.7rem);letter-spacing:-.055em;margin:0;font-weight:800}
.hero-subtitle{font-size:clamp(1.15rem,2.5vw,1.55rem);line-height:1.5;color:#e4e0e9;max-width:720px;margin:22px 0 0}
.accent-rule{height:4px;width:64px;background:var(--purple-light);margin:28px 0 24px}
.hero-note{color:var(--soft);max-width:690px;margin:0 0 28px}
.button-row{display:flex;flex-wrap:wrap;gap:12px}
.button{display:inline-flex;align-items:center;justify-content:center;padding:11px 18px;border:1px solid var(--purple-light);border-radius:5px;color:#fff;font-weight:700;background:var(--purple);min-height:46px}
.button:hover{color:#fff;background:var(--purple-light)}
.button.secondary{background:transparent;border-color:rgba(255,255,255,.28)}
.button.secondary:hover{background:rgba(255,255,255,.08);border-color:var(--accent)}
.section{padding:82px 0}
.section.alt{background:var(--panel)}
.section-head{text-align:center;max-width:780px;margin:0 auto 42px}
.section-kicker{font-size:.76rem;color:var(--accent);font-weight:800;letter-spacing:.18em;text-transform:uppercase;margin:0 0 9px}
h2{font-size:clamp(2rem,4vw,3rem);letter-spacing:-.035em;margin:0}
.section-head p{color:var(--soft);margin:18px auto 0;max-width:680px}
.section-head .accent-rule{margin:22px auto 0;width:52px;height:3px}
.two-col{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(260px,.8fr);gap:54px;align-items:start}
.prose{color:var(--soft)}
.prose p{margin:0 0 18px}
.prose p:last-child{margin-bottom:0}
.profile-card,.info-card,.project-card,.publication-card,.timeline-card,.contact-card{background:var(--panel);border:1px solid var(--line);border-radius:9px;overflow:hidden}
.profile-card{padding:24px}
.profile-top{display:flex;align-items:center;gap:18px;margin-bottom:18px}
.profile-photo{width:86px;height:86px;object-fit:cover;border-radius:50%;border:3px solid rgba(239,68,68,.65)}
.profile-card h3{font-size:1.15rem;margin:0 0 4px}
.profile-card .muted{font-size:.9rem;color:var(--muted);margin:0}
.tag-list{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.tag{border:1px solid rgba(239,68,68,.32);background:rgba(185,28,28,.13);color:#fecaca;padding:5px 10px;border-radius:4px;font-size:.78rem;font-weight:650}
.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.info-card,.project-card{padding:24px}
.info-card .number{color:var(--accent);font-size:.78rem;font-weight:800;letter-spacing:.15em}
.info-card h3,.project-card h3{font-size:1.18rem;margin:10px 0}
.info-card p,.project-card p{color:var(--soft);margin:0}
.card-link{display:inline-block;margin-top:16px;font-weight:700}
.page-hero{padding:68px 0 58px;background:linear-gradient(135deg,#222227,#18181c 70%);border-bottom:1px solid var(--line)}
.page-hero h1{font-size:clamp(2.5rem,5vw,4rem)}
.page-hero p{max-width:720px;color:var(--soft);font-size:1.08rem;margin:18px 0 0}
.content-section{padding:58px 0 90px}
.publication-card{padding:28px 30px;margin-bottom:20px}
.pub-type{font-size:.73rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);font-weight:800}
.publication-card h2{font-size:1.42rem;letter-spacing:-.015em;margin:10px 0 12px;text-align:left}
.citation{font-size:.92rem;color:var(--muted);border-left:3px solid var(--purple-light);padding-left:14px;margin:14px 0}
.publication-card p{color:var(--soft)}
.publication-card .button-row{margin-top:20px}
.timeline{display:grid;gap:18px}
.timeline-card{padding:25px 28px}
.timeline-card h2{font-size:1.25rem;text-align:left;margin-bottom:13px}
.timeline-card h3{font-size:1.05rem;margin:0 0 4px}
.timeline-card p,.timeline-card li{color:var(--soft)}
.timeline-card ul{padding-left:22px;margin:10px 0}
.date{color:var(--accent);font-weight:750;font-size:.82rem;letter-spacing:.05em;text-transform:uppercase}
.blog-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.blog-card{border:1px solid var(--line);border-radius:9px;overflow:hidden;background:var(--panel);display:flex;flex-direction:column}
.blog-card img{width:100%;height:205px;object-fit:cover}
.blog-card-content{padding:22px;display:flex;flex-direction:column;align-items:flex-start;flex:1}
.blog-card h2{font-size:1.18rem;text-align:left;margin:0 0 10px}
.blog-card p{color:var(--soft);margin:0}
.blog-card .card-link{margin-top:auto;padding-top:16px}
.notice{padding:18px 20px;border:1px solid rgba(239,68,68,.3);border-radius:6px;background:rgba(185,28,28,.09);color:var(--soft)}
.contact-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.contact-card{padding:22px}
.contact-card h3{font-size:1rem;margin:0 0 5px}
.contact-card p{color:var(--soft);margin:0;overflow-wrap:anywhere}
.site-footer{background:var(--bg-deep);border-top:1px solid var(--line);padding:30px 0;color:var(--muted);font-size:.88rem}
.footer-inner{display:flex;justify-content:space-between;align-items:center;gap:20px}
.footer-inner p{margin:0}
.footer-links{display:flex;gap:16px;flex-wrap:wrap}
.footer-links a{color:var(--soft)}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
@media(max-width:900px){.nav-inner{align-items:flex-start;padding:15px 0;flex-direction:column;gap:10px}.nav-links a{min-height:40px;padding:0 10px;border-bottom-width:2px}.two-col{grid-template-columns:1fr;gap:28px}.grid-3,.blog-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.hero{min-height:510px}}
@media(max-width:600px){.container{width:min(var(--width),calc(100% - 32px))}.nav-inner{gap:8px}.brand{font-size:1rem}.nav-links{gap:0}.nav-links a{font-size:.78rem;padding:0 8px}.hero{min-height:520px}.hero-content{padding:70px 0 90px}.section{padding:62px 0}.grid-3,.blog-grid,.contact-grid{grid-template-columns:1fr}.publication-card,.timeline-card{padding:22px 20px}.footer-inner{flex-direction:column;text-align:center}.blog-card img{height:220px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}