/* ===== Self-hosted fonts ===== */
@font-face { font-family: "Inter"; font-style: normal; font-weight: 400; font-display: swap; src: url("../fonts/inter-latin-400.woff2") format("woff2"); }
@font-face { font-family: "Inter"; font-style: normal; font-weight: 500; font-display: swap; src: url("../fonts/inter-latin-500.woff2") format("woff2"); }
@font-face { font-family: "Inter"; font-style: normal; font-weight: 600; font-display: swap; src: url("../fonts/inter-latin-600.woff2") format("woff2"); }
@font-face { font-family: "Inter"; font-style: normal; font-weight: 700; font-display: swap; src: url("../fonts/inter-latin-700.woff2") format("woff2"); }
@font-face { font-family: "Inter"; font-style: normal; font-weight: 800; font-display: swap; src: url("../fonts/inter-latin-800.woff2") format("woff2"); }
@font-face { font-family: "JetBrains Mono"; font-style: normal; font-weight: 400; font-display: swap; src: url("../fonts/jetbrains-mono-latin-400.woff2") format("woff2"); }
@font-face { font-family: "JetBrains Mono"; font-style: normal; font-weight: 500; font-display: swap; src: url("../fonts/jetbrains-mono-latin-500.woff2") format("woff2"); }
@font-face { font-family: "JetBrains Mono"; font-style: normal; font-weight: 600; font-display: swap; src: url("../fonts/jetbrains-mono-latin-600.woff2") format("woff2"); }

/* ===== Design tokens ===== */
:root {
  --bg: #0a0c10;
  --bg-2: #0f1218;
  --bg-3: #141925;
  --surface: #11151d;
  --surface-2: #161c28;
  --border: #222a38;
  --border-2: #2c3647;
  --text: #e6e9ef;
  --text-dim: #aab2c0;
  --text-mute: #6b7587;
  --accent: #7c5cff;
  --accent-2: #34d0ff;
  --accent-soft: rgba(124, 92, 255, 0.14);
  --grad: linear-gradient(100deg, #7c5cff 0%, #34d0ff 100%);
  --maxw: 1120px;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 18px 50px -20px rgba(0, 0, 0, 0.7);
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { line-height: 1.15; margin: 0; letter-spacing: -0.02em; }
ul { margin: 0; padding: 0; list-style: none; }

.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: 24px; }
.grad {
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 200;
  background: var(--accent); color: #fff; padding: 10px 16px; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 20px; border-radius: 999px;
  font-weight: 600; font-size: 0.95rem; cursor: pointer;
  border: 1px solid transparent; transition: transform .15s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
  white-space: nowrap;
}
.btn--accent { background: var(--grad); color: #0a0c10; box-shadow: 0 10px 30px -10px rgba(124, 92, 255, .6); }
.btn--accent:hover { transform: translateY(-2px); box-shadow: 0 16px 36px -10px rgba(124, 92, 255, .75); }
.btn--ghost { background: var(--surface); color: var(--text); border-color: var(--border-2); }
.btn--ghost:hover { border-color: var(--accent); color: #fff; transform: translateY(-2px); }
.btn--lg { padding: 15px 28px; font-size: 1.02rem; }

/* ===== Nav ===== */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10, 12, 16, 0.72);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav__inner { display: flex; align-items: center; gap: 24px; height: 68px; }
.nav__brand { display: flex; align-items: center; gap: 10px; font-weight: 700; margin-right: auto; }
.nav__brand-mark {
  display: grid; place-items: center; width: 34px; height: 34px; border-radius: 9px;
  background: var(--grad); color: #0a0c10; font-family: var(--mono); font-weight: 700; font-size: 0.85rem;
}
.nav__brand-text { font-size: 1rem; }
.nav__links { display: flex; gap: 26px; }
.nav__links a { color: var(--text-dim); font-size: 0.95rem; font-weight: 500; position: relative; }
.nav__links a:hover { color: var(--text); }
.nav__links a::after {
  content: ""; position: absolute; left: 0; bottom: -6px; width: 0; height: 2px;
  background: var(--grad); transition: width .25s ease;
}
.nav__links a:hover::after { width: 100%; }
.nav__cta { padding: 9px 16px; font-size: 0.9rem; }
.nav__toggle { display: none; background: none; border: 0; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; }
.nav__toggle span { width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: .25s; }

/* ===== Hero ===== */
.hero { position: relative; padding: clamp(48px, 8vw, 96px) 0 40px; overflow: hidden; }
.hero__glow {
  position: absolute; top: -260px; left: 50%; transform: translateX(-50%);
  width: 900px; height: 700px; pointer-events: none;
  background: radial-gradient(circle at 30% 30%, rgba(124, 92, 255, .28), transparent 60%),
              radial-gradient(circle at 70% 50%, rgba(52, 208, 255, .18), transparent 55%);
  filter: blur(20px);
}
.hero__inner { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 48px; align-items: center; }
.hero__eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--mono); font-size: 0.82rem; color: var(--text-dim);
  background: var(--surface); border: 1px solid var(--border); padding: 7px 14px; border-radius: 999px; margin: 0 0 22px;
}
.dot { width: 8px; height: 8px; border-radius: 50%; background: #3ddc84; box-shadow: 0 0 0 4px rgba(61, 220, 132, .18); }
.hero__title { font-size: clamp(2.6rem, 6vw, 4.4rem); font-weight: 800; margin-bottom: 22px; }
.hero__lead { font-size: clamp(1.05rem, 1.6vw, 1.22rem); color: var(--text-dim); max-width: 36ch; margin-bottom: 30px; }
.hero__lead strong { color: var(--text); font-weight: 600; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 26px; }
.hero__socials { display: flex; flex-wrap: wrap; gap: 22px; }
.hero__socials a { display: inline-flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: 0.85rem; color: var(--text-mute); }
.hero__socials a:hover { color: var(--accent-2); }
.hero__socials .ico { width: 17px; height: 17px; }

.hero__aside { display: flex; flex-direction: column; gap: 22px; }
.hero__photo {
  position: relative; max-width: 300px; /* never upscale past the image's intrinsic width */
  border-radius: 22px; overflow: hidden; border: 1px solid var(--border-2);
  box-shadow: var(--shadow); background: var(--surface);
}
.hero__photo::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(10, 12, 16, .5));
}
.hero__photo img { width: 100%; aspect-ratio: 4 / 4.2; object-fit: cover; object-position: top center; }
/* Hero tech chips (static) */
.hero__stack { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 52px; }
.chip {
  font-family: var(--mono); font-size: 0.82rem; color: var(--text-dim);
  background: var(--surface); border: 1px solid var(--border); padding: 7px 14px; border-radius: 999px;
  transition: border-color .2s ease, color .2s ease, transform .15s ease;
}
.chip:hover { border-color: var(--accent); color: var(--text); transform: translateY(-2px); }

/* Brand icons */
.ico { width: 18px; height: 18px; fill: currentColor; flex-shrink: 0; }

/* ===== Sections ===== */
.section { padding: clamp(64px, 9vw, 110px) 0; position: relative; }
.section--alt { background: var(--bg-2); border-block: 1px solid var(--border); }
.section__head { max-width: 640px; margin-bottom: 48px; }
.section__kicker { font-family: var(--mono); font-size: 0.85rem; color: var(--accent-2); margin: 0 0 12px; }
.section__title { font-size: clamp(2rem, 4vw, 2.9rem); font-weight: 800; }
.section__sub { color: var(--text-dim); margin-top: 16px; font-size: 1.05rem; }
.section__sub a { color: var(--accent-2); border-bottom: 1px solid transparent; }
.section__sub a:hover { border-color: var(--accent-2); }
.subhead { display: flex; align-items: center; gap: 12px; font-size: 0.95rem; font-family: var(--mono); color: var(--text-dim); text-transform: uppercase; letter-spacing: .08em; margin: 8px 0 22px; }

.pulse { width: 9px; height: 9px; border-radius: 50%; background: #3ddc84; position: relative; }
.pulse::after { content: ""; position: absolute; inset: -5px; border-radius: 50%; border: 2px solid #3ddc84; animation: ping 1.8s ease-out infinite; }
@keyframes ping { 0% { transform: scale(.6); opacity: .9; } 100% { transform: scale(1.6); opacity: 0; } }

/* ===== Tags ===== */
.tag {
  font-family: var(--mono); font-size: 0.72rem; font-weight: 500;
  background: var(--accent-soft); color: #b9a9ff; border: 1px solid rgba(124, 92, 255, .25);
  padding: 4px 10px; border-radius: 999px; white-space: nowrap;
}
.tag--lang { background: rgba(52, 208, 255, .12); color: #8fe3ff; border-color: rgba(52, 208, 255, .25); }

/* ===== Upcoming talks (prominent) ===== */
.upcoming-block {
  background: linear-gradient(150deg, rgba(124, 92, 255, .13), rgba(52, 208, 255, .05));
  border: 1px solid rgba(124, 92, 255, .32); border-radius: 20px;
  padding: 28px; margin-bottom: 60px; box-shadow: var(--shadow);
}
.upcoming-block__head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 22px; }
.upcoming-block__title { display: flex; align-items: center; gap: 12px; font-size: clamp(1.3rem, 2.6vw, 1.6rem); font-weight: 800; }
.upcoming-block__sub { font-family: var(--mono); font-size: 0.82rem; color: var(--text-mute); white-space: nowrap; }
.upcoming { display: grid; gap: 14px; }
.upcoming__card {
  display: grid; grid-template-columns: 1fr auto; align-items: start; gap: 18px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px 26px; transition: border-color .2s ease, transform .2s ease, background .2s ease;
}
.upcoming__card:hover { border-color: var(--accent); transform: translateX(4px); background: var(--surface-2); }
.upcoming__card--next {
  border-color: rgba(124, 92, 255, .55); background: var(--surface-2);
  box-shadow: 0 0 0 1px rgba(124, 92, 255, .25), 0 16px 44px -24px rgba(124, 92, 255, .8);
}
.upcoming__flag {
  display: inline-block; font-family: var(--mono); font-size: 0.7rem; font-weight: 600;
  color: #0a0c10; background: var(--grad); padding: 3px 11px; border-radius: 999px; margin-bottom: 9px;
}
.upcoming__when {
  display: inline-block; font-family: var(--mono); font-size: 0.92rem; font-weight: 600;
  color: var(--accent-2); margin: 0 0 8px;
}
.upcoming__body h4 { font-size: 1.2rem; margin-bottom: 6px; }
.upcoming__meta { font-family: var(--mono); font-size: 0.8rem; color: var(--accent-2); margin: 0 0 8px; }
.upcoming__meta em { font-style: normal; color: var(--text-mute); }
.upcoming__desc { color: var(--text-dim); font-size: 0.92rem; margin: 0; }
.upcoming__link { display: inline-block; margin-top: 12px; font-family: var(--mono); font-size: 0.8rem; color: var(--accent-2); }
.upcoming__link:hover { text-decoration: underline; }

/* ===== Featured talks ===== */
.talks-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin-bottom: 44px; }
.talk {
  display: flex; flex-direction: column;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; position: relative; overflow: hidden;
  transition: border-color .25s ease, transform .25s ease;
}
.talk::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 3px; background: var(--grad);
  transform: scaleX(0); transform-origin: left; transition: transform .3s ease;
}
.talk:hover { border-color: var(--border-2); transform: translateY(-4px); }
.talk:hover::before { transform: scaleX(1); }
.talk__top { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 16px; }
.talk__tags { display: inline-flex; align-items: center; gap: 8px; }
.talk__num { font-family: var(--mono); font-size: 1.6rem; font-weight: 700; color: var(--border-2); }
.talk__title { font-size: 1.2rem; margin-bottom: 12px; }
.talk__title-en { display: block; margin-top: 4px; font-family: var(--mono); font-size: 0.8rem; font-weight: 500; color: var(--text-mute); }
.talk__abstract { color: var(--text-dim); font-size: 0.94rem; margin: 0 0 14px; }
.talk__abstract--clamp {
  display: -webkit-box; -webkit-line-clamp: 5; line-clamp: 5; -webkit-box-orient: vertical; overflow: hidden;
}
.talk__more {
  align-self: flex-start; background: none; border: 0; padding: 0; margin: 0 0 16px; cursor: pointer;
  font-family: var(--mono); font-size: 0.8rem; color: var(--accent-2);
}
.talk__more:hover { text-decoration: underline; }
.talk__foot {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  margin-top: auto; padding-top: 14px; border-top: 1px solid var(--border);
}
.talk__venue { font-family: var(--mono); font-size: 0.8rem; color: var(--text-mute); margin: 0; }
.talk__slides {
  font-family: var(--mono); font-size: 0.78rem; font-weight: 500; color: var(--accent-2);
  white-space: nowrap; border: 1px solid rgba(52, 208, 255, .3); padding: 4px 10px; border-radius: 999px;
  transition: background .2s ease, border-color .2s ease;
}
a.talk__slides:hover { background: rgba(52, 208, 255, .12); border-color: var(--accent-2); }
.talk__slides--soon { color: var(--text-mute); border-color: var(--border); }

/* More talks */
.more-talks { border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); padding: 4px 24px; }
.more-talks summary { cursor: pointer; padding: 18px 0; font-weight: 600; list-style: none; display: flex; align-items: center; gap: 10px; }
.more-talks summary::-webkit-details-marker { display: none; }
.more-talks summary::before { content: "+"; font-family: var(--mono); color: var(--accent); font-size: 1.2rem; }
.more-talks[open] summary::before { content: "–"; }
.more-talks__hint { color: var(--text-mute); font-weight: 400; font-family: var(--mono); font-size: 0.82rem; }
.talk-list { border-top: 1px solid var(--border); padding-top: 14px; display: grid; gap: 12px; }
.talk-list li { color: var(--text-dim); font-size: 0.92rem; }
.talk-list__date { font-family: var(--mono); font-size: 0.78rem; color: var(--accent-2); margin-right: 8px; }
.talk-list__venue { color: var(--text-mute); }
.link-arrow { display: inline-block; margin: 16px 0 18px; font-family: var(--mono); font-size: 0.85rem; color: var(--accent-2); }
.link-arrow:hover { text-decoration: underline; }

/* ===== Topics ===== */
.topics { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin-bottom: 40px; }
.topic { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; transition: border-color .2s ease, background .2s ease; }
.topic:hover { border-color: var(--border-2); background: var(--surface-2); }
.topic h3 { font-size: 1.15rem; margin-bottom: 10px; }
.topic p { color: var(--text-dim); font-size: 0.94rem; margin: 0; }

.newsletter {
  display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap;
  background: linear-gradient(120deg, var(--accent-soft), rgba(52, 208, 255, .07));
  border: 1px solid rgba(124, 92, 255, .3); border-radius: var(--radius); padding: 28px 32px;
}
.newsletter__title { font-size: 1.25rem; margin-bottom: 6px; }
.newsletter p { color: var(--text-dim); margin: 0; max-width: 52ch; }

/* ===== Community ===== */
.community { display: grid; grid-template-columns: 1.4fr 1fr; gap: 18px; }
.community__card {
  display: flex; flex-direction: column; align-items: flex-start;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 30px; transition: border-color .2s ease, transform .2s ease, background .2s ease;
}
.community__card:hover { border-color: var(--accent); transform: translateY(-4px); }
.community__card--feature {
  background: linear-gradient(130deg, var(--accent-soft), rgba(52, 208, 255, .06));
  border-color: rgba(124, 92, 255, .3);
}
.community__card h3 { font-size: 1.3rem; margin: 12px 0 10px; }
.community__card--feature h3 { font-size: 1.6rem; }
.community__card p { color: var(--text-dim); font-size: 0.95rem; margin: 0 0 16px; flex: 1; }
.community__badge {
  font-family: var(--mono); font-size: 0.72rem; color: #b9a9ff;
  background: var(--accent-soft); border: 1px solid rgba(124, 92, 255, .3);
  padding: 5px 12px; border-radius: 999px;
}
.community__badge--alt { color: #8fe3ff; background: rgba(52, 208, 255, .12); border-color: rgba(52, 208, 255, .25); }
.community__card .link-arrow { margin: 0; }

/* ===== Projects ===== */
.projects { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.project { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; display: flex; flex-direction: column; transition: border-color .2s ease, transform .2s ease; }
.project:hover { border-color: var(--accent); transform: translateY(-4px); }
.project h3 { font-size: 1.15rem; margin-bottom: 10px; }
.project p { color: var(--text-dim); font-size: 0.92rem; margin: 0 0 18px; flex: 1; }
.project__tags { font-family: var(--mono); font-size: 0.74rem; color: var(--text-mute); }

/* ===== Research ===== */
.research { display: grid; grid-template-columns: 1.3fr 1fr; gap: 40px; align-items: start; }
.research__main h3 { font-size: 1.35rem; margin-bottom: 6px; }
.research__inst { font-family: var(--mono); font-size: 0.85rem; color: var(--accent-2); margin: 0 0 16px; }
.research__main p { color: var(--text-dim); }
.research__links { display: flex; flex-direction: column; align-items: flex-start; }
.research__links .link-arrow { margin: 14px 0 0; }
.research__facts { display: grid; gap: 14px; }
.research__facts li { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 16px 18px; color: var(--text-dim); font-size: 0.92rem; }
.research__facts strong { color: var(--text); }

/* ===== About + certs ===== */
.about__bio { display: grid; grid-template-columns: 1fr 220px; gap: 36px; align-items: start; margin-bottom: 52px; }
.about__bio p { color: var(--text-dim); margin: 0 0 18px; }
.about__bio strong { color: var(--text); font-weight: 600; }
.about__photo { width: 220px; border-radius: 14px; border: 1px solid var(--border-2); box-shadow: var(--shadow); }
.about__cols { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }

/* Experience timeline */
.timeline { display: grid; gap: 4px; position: relative; }
.timeline li {
  position: relative; padding: 0 0 22px 26px; border-left: 2px solid var(--border);
}
.timeline li:last-child { border-left-color: transparent; padding-bottom: 0; }
.timeline li::before {
  content: ""; position: absolute; left: -7px; top: 4px; width: 12px; height: 12px;
  border-radius: 50%; background: var(--bg); border: 2px solid var(--accent);
}
.timeline__date { font-family: var(--mono); font-size: 0.78rem; color: var(--accent-2); }
.timeline h4 { font-size: 1.05rem; margin: 4px 0 4px; }
.timeline li p { color: var(--text-dim); font-size: 0.9rem; margin: 0; }
.timeline li p a { color: var(--accent-2); }
.timeline li p a:hover { text-decoration: underline; }
.certs { display: grid; gap: 9px; }
.certs li {
  display: flex; gap: 16px; align-items: baseline;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 12px 16px; font-size: 0.9rem; color: var(--text-dim);
  transition: border-color .2s ease, transform .15s ease;
}
.certs li:hover { border-color: var(--border-2); transform: translateX(3px); }
.certs__year { font-family: var(--mono); font-size: 0.8rem; color: var(--accent); min-width: 42px; }

/* ===== Contact ===== */
.section--cta { background: var(--bg-2); border-top: 1px solid var(--border); text-align: center; }
.contact { max-width: 720px; }
.contact__title { font-size: clamp(2rem, 4.5vw, 3rem); font-weight: 800; margin-bottom: 18px; }
.contact__sub { color: var(--text-dim); font-size: 1.08rem; margin-bottom: 32px; }
.contact__actions { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; }

/* ===== Footer ===== */
.footer { border-top: 1px solid var(--border); padding: 30px 0; background: var(--bg); }
.footer__inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.footer p { color: var(--text-mute); font-size: 0.85rem; margin: 0; }
.footer__links { display: flex; gap: 22px; }
.footer__links a { color: var(--text-mute); font-size: 0.85rem; }
.footer__links a:hover { color: var(--text); }

/* ===== Reveal animation ===== */
.section__head, .upcoming__card, .talk, .topic, .project, .research__main, .research__facts li, .certs, .newsletter { opacity: 1; }
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .pulse::after { animation: none; }
  html { scroll-behavior: auto; }
}

/* ===== Legal sections (Impressum & Datenschutz) ===== */
.legal-sections { background: var(--bg-2); border-top: 1px solid var(--border); padding: clamp(48px, 7vw, 80px) 0; }
.legal-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.legal-block { scroll-margin-top: 88px; }
.legal-block h2 { font-size: 1.4rem; margin-bottom: 14px; }
.legal-block h3 { font-family: var(--mono); font-size: 0.8rem; text-transform: uppercase; letter-spacing: .06em; color: var(--text-dim); margin: 22px 0 6px; }
.legal-block p, .legal-block address { color: var(--text-mute); font-style: normal; font-size: 0.88rem; line-height: 1.7; margin: 0 0 12px; max-width: 60ch; }
.legal-block a { color: var(--accent-2); }
.legal-block a:hover { text-decoration: underline; }
.legal__updated { font-family: var(--mono); font-size: 0.78rem; color: var(--text-mute); margin-top: 16px; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .talks-grid, .topics, .projects, .research, .community, .about__bio, .about__cols, .legal-grid { grid-template-columns: 1fr; }
  .about__photo { width: 100%; max-width: 280px; }
  .nav__links, .nav__cta { display: none; }
  .nav__toggle { display: flex; }
  .nav.is-open .nav__links {
    display: flex; position: absolute; top: 68px; left: 0; right: 0; flex-direction: column;
    background: var(--bg-2); border-bottom: 1px solid var(--border); padding: 18px 24px; gap: 16px;
  }
  .nav.is-open .nav__cta { display: inline-flex; position: absolute; top: 230px; left: 24px; }
}
@media (max-width: 760px) {
  .hero__inner { grid-template-columns: 1fr; gap: 36px; }
  .hero__aside { order: -1; max-width: 300px; justify-self: center; }
  .hero__lead { max-width: none; }
}
@media (max-width: 560px) {
  .upcoming-block { padding: 18px; }
  .upcoming-block__head { flex-direction: column; gap: 4px; }
  .talk__foot { flex-direction: column; align-items: flex-start; gap: 8px; }
  .newsletter { flex-direction: column; align-items: flex-start; }
  .footer__inner { flex-direction: column; text-align: center; }
}