/* Modern make-over of the home page: glass nav with sliding pill, scroll progress,
   reveal-on-scroll, spotlight cards. Same blue accent as the original. */
:root {
    --bg: #ffffff; --surface: #ffffff; --text: #111418; --muted: #5b6270;
    --accent: #0066cc; --accent-soft: rgba(0,102,204,.10); --border: #e3e3de;
    --serif: Georgia, 'Times New Roman', serif;
    --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 5rem; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: var(--serif); font-size: 1.2rem; line-height: 1.7; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
.wrap { width: min(1080px, 100% - 2.5rem); margin: 0 auto; }

/* Progress bar */
.progress { position: fixed; top: 0; left: 0; height: 3px; width: 100%; transform-origin: 0 50%; transform: scaleX(0); background: var(--accent); z-index: 50; }

/* Nav */
.nav { position: sticky; top: 0; z-index: 40; backdrop-filter: blur(14px) saturate(1.4); -webkit-backdrop-filter: blur(14px) saturate(1.4);
       background: color-mix(in srgb, var(--bg) 75%, transparent); border-bottom: 1px solid var(--border); font-family: var(--sans); }
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 4rem; }
.brand { font-weight: 700; letter-spacing: -.01em; color: var(--text); text-decoration: none; }
.menu { position: relative; display: flex; gap: .25rem; list-style: none; margin: 0; padding: 0; }
.menu a { position: relative; z-index: 1; display: block; padding: .45rem .9rem; font-size: .9rem; font-weight: 500; color: var(--muted); text-decoration: none; border-radius: 999px; transition: color .2s; }
.menu a:hover, .menu a.active { color: var(--text); }
.pill { position: absolute; top: 0; left: 0; height: 100%; border-radius: 999px; background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
        transition: transform .35s cubic-bezier(.3,1.3,.5,1), width .35s cubic-bezier(.3,1.3,.5,1), opacity .2s; opacity: 0; pointer-events: none; }
.toggle { display: none; background: none; border: 1px solid var(--border); border-radius: 8px; color: var(--text); padding: .4rem .7rem; font: 500 .9rem var(--sans); }
@media (max-width: 760px) {
    .toggle { display: block; }
    .menu { position: absolute; top: 4rem; left: 0; right: 0; flex-direction: column; background: var(--bg); border-bottom: 1px solid var(--border); padding: .5rem 1.25rem 1rem; display: none; }
    .menu.open { display: flex; }
    .pill { display: none; }
    .menu a.active { background: var(--accent-soft); }
}

/* Hero */
.hero { position: relative; overflow: hidden; padding: 6rem 0 5rem; }
.hero::before { content: ""; position: absolute; inset: -20% -10% auto auto; width: 60vw; height: 60vw; max-width: 700px; max-height: 700px; border-radius: 50%;
                background: radial-gradient(circle, var(--accent-soft), transparent 65%); animation: drift 14s ease-in-out infinite alternate; z-index: -1; }
@keyframes drift { to { transform: translate(-8%, 10%) scale(1.15); } }
.hero .wrap { display: flex; align-items: center; gap: 3rem; flex-wrap: wrap; }
.hero img { width: 190px; height: 190px; border-radius: 50%; object-fit: cover; box-shadow: 0 0 0 6px var(--bg), 0 0 0 7px var(--border), 0 20px 50px -20px rgba(0,0,0,.4); }
.hero h1 { font-family: var(--serif); font-weight: 700; letter-spacing: -.02em; line-height: 1.15; padding-bottom: .12em; font-size: clamp(2.8rem, 8vw, 5.5rem); margin: 0 0 .5rem;
           background: linear-gradient(100deg, var(--text) 30%, var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p { margin: 0; font-style: italic; font-size: 1.5rem; color: var(--muted); }

/* Sections */
section.block { padding: 4.5rem 0; border-top: 1px solid var(--border); }
section.block h2 { font-family: var(--sans); font-size: .85rem; font-weight: 600; text-transform: uppercase; letter-spacing: .14em; color: var(--accent); margin: 0 0 2rem; display: flex; align-items: center; gap: 1rem; }
section.block h2::after { content: ""; height: 1px; flex: 1; background: var(--border); }
.prose { max-width: 42rem; }
.prose p { margin: 0 0 1.4rem; }
.prose p:first-child { font-size: 1.4rem; line-height: 1.55; }

/* Cards */
.grid { display: grid; gap: 1.25rem; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
.card { --mx: 50%; --my: 50%; position: relative; background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 1.6rem; font-size: 1rem; line-height: 1.6;
        transition: transform .25s ease, box-shadow .25s ease, border-color .25s; overflow: hidden; }
.card::before { content: ""; position: absolute; inset: 0; background: radial-gradient(320px circle at var(--mx) var(--my), var(--accent-soft), transparent 70%); opacity: 0; transition: opacity .25s; pointer-events: none; }
.card:hover { transform: translateY(-4px); border-color: color-mix(in srgb, var(--accent) 50%, var(--border)); box-shadow: 0 18px 40px -22px rgba(0,0,0,.35); }
.card:hover::before { opacity: 1; }
.card h3 { position: relative; font-family: var(--serif); font-size: 1.15rem; line-height: 1.3; margin: 0 0 .7rem; }
.card h3 a { color: var(--text); text-decoration: none; }
.card p { position: relative; margin: 0 0 1rem; color: var(--muted); }
.card p a { color: var(--accent); }
.tags { position: relative; display: flex; flex-wrap: wrap; gap: .4rem; }
.tags span { font: 500 .72rem var(--sans); padding: .2rem .6rem; border-radius: 999px; background: var(--accent-soft); color: var(--accent); }

.btn { display: inline-block; margin-top: 2.5rem; font: 600 .95rem var(--sans); padding: .8rem 1.5rem; border-radius: 999px; background: var(--accent); color: #fff; text-decoration: none; transition: transform .2s, box-shadow .2s; }
.btn:hover { transform: translateY(-2px); box-shadow: 0 10px 24px -10px var(--accent); }
.links { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: 1.25rem; }
.links a { font: 500 .9rem var(--sans); padding: .5rem 1.1rem; border: 1px solid var(--border); border-radius: 999px; color: var(--text); text-decoration: none; background: var(--surface); transition: all .2s; }
.links a:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }

footer { padding: 3rem 0; border-top: 1px solid var(--border); font: .85rem var(--sans); color: var(--muted); }

/* Reveal on scroll */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s cubic-bezier(.2,.7,.2,1); transition-delay: var(--d, 0s); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .reveal { opacity: 1; transform: none; transition: none; }
    .hero::before, .pill { animation: none; transition: none; }
}

/* ---- Sub-pages (papers, photography) ---- */
.page { padding: 4rem 0 5rem; }
.page h1 { font-family: var(--serif); font-weight: 700; letter-spacing: -.02em; line-height: 1.15; padding-bottom: .1em; font-size: clamp(2.4rem, 6vw, 4rem); margin: 0 0 1rem;
           background: linear-gradient(100deg, var(--text) 30%, var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.wrap.wide { width: min(1280px, 100% - 2.5rem); }
.bib-note { font: .95rem var(--sans); color: var(--muted); margin: 0 0 3rem; }
.year-group { margin-bottom: 2.5rem; }
.year-heading { position: sticky; top: 4rem; z-index: 5; background: color-mix(in srgb, var(--bg) 85%, transparent); backdrop-filter: blur(8px); padding: .6rem 0;
                font: 700 .85rem var(--sans); letter-spacing: .14em; color: var(--accent); border-bottom: 1px solid var(--border); margin-bottom: 1.25rem; }
.paper-entry { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 1.2rem 1.4rem; margin-bottom: .9rem; font-size: 1rem; line-height: 1.55;
               transition: transform .25s, box-shadow .25s, border-color .25s; }
.paper-entry:hover { transform: translateX(6px); border-color: color-mix(in srgb, var(--accent) 50%, var(--border)); box-shadow: 0 14px 30px -22px rgba(0,0,0,.4); }
.paper-title { font-weight: 700; font-size: 1.08rem; }
.paper-title a { color: var(--text); text-decoration: none; } .paper-title a:hover { color: var(--accent); }
.paper-authors { color: var(--muted); }
.paper-venue { color: var(--muted); font-style: italic; }
.paper-links { margin-top: .5rem; display: flex; flex-wrap: wrap; gap: .4rem; }
.paper-links a { font: 600 .75rem var(--sans); text-transform: uppercase; letter-spacing: .06em; padding: .2rem .7rem; border-radius: 999px; background: var(--accent-soft); color: var(--accent); text-decoration: none; transition: background .2s, color .2s; }
.paper-links a:hover { background: var(--accent); color: #fff; }

.gallery-covers { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.5rem; margin: 2rem 0 4rem; }
.gallery-cover { display: block; text-decoration: none; color: var(--text); }
.gallery-cover img { width: 100%; aspect-ratio: 16/9; object-fit: cover; display: block; border-radius: 14px; border: 1px solid var(--border); transition: transform .4s cubic-bezier(.2,.7,.2,1), box-shadow .3s; }
.gallery-cover .frame { display: block; overflow: hidden; border-radius: 14px; }
.gallery-cover:hover img { transform: scale(1.05); box-shadow: 0 18px 40px -20px rgba(0,0,0,.5); }
.gallery-cover-title { display: block; font: 700 1.05rem var(--serif); margin-top: .7rem; transition: color .2s; }
.gallery-cover:hover .gallery-cover-title { color: var(--accent); }
.gallery-cover-meta { display: block; font: .85rem var(--sans); color: var(--muted); }
.gallery { margin-bottom: 4rem; scroll-margin-top: 5rem; }
.gallery-title { font: 700 .85rem var(--sans); text-transform: uppercase; letter-spacing: .14em; color: var(--accent); margin: 0 0 1.25rem; padding-bottom: .7rem; border-bottom: 1px solid var(--border); }
.gallery-year { color: var(--muted); font-weight: 400; }
.photo-grid { display: flex; flex-wrap: wrap; gap: 8px; }
.photo-grid::after { content: ""; flex-grow: 999999; }
.photo-item { display: block; overflow: hidden; border-radius: 8px; background: var(--border); }
.photo-item img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .5s cubic-bezier(.2,.7,.2,1), filter .3s; }
.photo-item:hover img { transform: scale(1.06); filter: brightness(1.05); }

.lightbox { position: fixed; inset: 0; background: rgba(8,10,14,.95); z-index: 2000; display: none; align-items: center; justify-content: center; }
.lightbox.open { display: flex; animation: lbin .25s ease; }
@keyframes lbin { from { opacity: 0; } }
.lightbox img { max-width: 92vw; max-height: 88vh; object-fit: contain; border-radius: 4px; }
.lightbox button { position: absolute; background: rgba(255,255,255,.08); border: 0; border-radius: 50%; width: 3rem; height: 3rem; color: #fff; font-size: 1.8rem; line-height: 1; cursor: pointer; opacity: .8; font-family: var(--sans); transition: background .2s, opacity .2s; }
.lightbox button:hover, .lightbox button:focus-visible { opacity: 1; background: rgba(255,255,255,.2); }
.lightbox-close { top: 1rem; right: 1rem; }
.lightbox-prev { left: 1rem; top: 50%; transform: translateY(-50%); }
.lightbox-next { right: 1rem; top: 50%; transform: translateY(-50%); }
.lightbox-caption { position: absolute; bottom: 1rem; left: 0; right: 0; text-align: center; color: #ccc; font: .9rem var(--sans); }
@media (max-width: 480px) { .gallery-covers { grid-template-columns: 1fr; } }

/* Photography is only for babaoglu.eu visitors (class set by js/site.js) */
html:not(.site-eu) .nav-photography { display: none; }