/* Base styles */
:root {
  --bg: #0f1115;
  --bg-alt: #161a21;
  --bg-accent: #1f2530;
  --text: #e6e9ef;
  --text-soft: #9aa4b4;
  --brand: #d4af37;
  --brand-accent: #f5d778;
  --link: #ffc861;
  --radius: 12px;
  --fw-serif: 'Fraunces', serif;
  --fw-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', 'Helvetica Neue', Arial, sans-serif;
  --shadow: 0 8px 24px -8px rgba(0,0,0,.5), 0 2px 6px -2px rgba(0,0,0,.4);
  --max-narrow: 760px;
  --max-wide: 1000px;
}

* {box-sizing: border-box;}
html {scroll-behavior: smooth;}
body {
  margin: 0;
  font-family: var(--fw-sans);
  background: radial-gradient(circle at 25% 15%, #1c2330, #0c0e12 60%) fixed;
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img {max-width: 100%; height: auto; border-radius: var(--radius);}

h1,h2,h3,h4 {font-family: var(--fw-serif); font-weight: 600; line-height: 1.15; margin: 0 0 .6em; letter-spacing: .5px;}

h1 {font-size: clamp(2.4rem, 6vw, 3.2rem);}
h2 {font-size: clamp(1.9rem, 4.5vw, 2.4rem);}
h3 {font-size: clamp(1.35rem, 3.5vw, 1.6rem);}

p {margin: 0 0 1em;}
ul,ol {margin: 0 0 1.4em 1.25em; padding: 0;}
ul {list-style: square;}
li {margin: .4em 0;}

.lead {font-size: 1.15rem; font-weight: 400; color: var(--text-soft);}
.note {font-size: .9rem; color: var(--text-soft);}
.fine {font-size: .75rem; color: var(--text-soft);}

/* Layout */
.container {width: 100%; margin: 0 auto; padding: 0 1.2rem;}
.container.narrow {max-width: var(--max-narrow);}
.container.wide {max-width: var(--max-wide);}
.hero .container {max-width: var(--max-wide);}

.section {padding: clamp(3rem, 8vh, 5rem) 0; position: relative;}
.section.alt {background: linear-gradient(145deg, var(--bg-alt), var(--bg));}
.section:not(.alt):before {content:""; position: absolute; inset: 0; background: radial-gradient(circle at 80% 20%, rgba(255,215,128,0.05), transparent 60%); pointer-events: none;}

/* Header */
.site-header {position: sticky; top: 0; backdrop-filter: blur(14px); background: rgba(15,17,21,0.85); border-bottom: 1px solid rgba(255,255,255,0.06); z-index: 100;}
.header-inner {display: flex; align-items: center; justify-content: space-between; min-height: 72px;}
.logo {font-family: var(--fw-serif); font-size: 1.4rem; font-weight: 600; background: linear-gradient(90deg, var(--brand), var(--brand-accent)); -webkit-background-clip: text; background-clip: text; color: transparent; text-decoration: none;}
.logo.small {font-size: 1.1rem;}
.tagline {margin: .2rem 0 0; font-size: .75rem; letter-spacing: 2px; text-transform: uppercase; color: var(--text-soft);}
.branding {display: flex; flex-direction: column; align-items: flex-start;}

.main-nav ul {display: flex; gap: 1.2rem; list-style: none; margin: 0; padding: 0;}
.main-nav a {text-decoration: none; color: var(--text-soft); font-size: .85rem; letter-spacing: .5px; font-weight: 500; padding: .4rem .6rem; border-radius: 6px; transition: .25s color, .25s background;} 
.main-nav a:hover, .main-nav a:focus {color: var(--link); background: rgba(255,255,255,0.06);} 
.nav-toggle {display:none; background:none; border:1px solid rgba(255,255,255,.2); color:var(--text); padding:.5rem .7rem; border-radius:8px; font-size:1.1rem; cursor:pointer;}

/* Hero */
.hero {padding: clamp(4rem, 12vh, 8rem) 0 4rem; background: linear-gradient(160deg, #182030, #0f1115 55%); position: relative; overflow: hidden;}
.hero:after {content:""; position:absolute; inset:0; background:radial-gradient(circle at 20% 30%, rgba(212,175,55,0.12), transparent 60%); mix-blend-mode:screen; pointer-events:none;}
.hero-grid {display:grid; gap: 3rem; align-items:center; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));}
.hero-photo {margin:0; position:relative;}
.hero-photo img {width:100%; max-width:340px; display:block; box-shadow:var(--shadow); border: 1px solid rgba(255,255,255,0.08);} 
.hero-photo figcaption {font-size:.65rem; text-transform:uppercase; letter-spacing:1px; text-align:center; margin-top:.6rem; color:var(--text-soft);} 

/* Elements */
.btn {display:inline-block; background: var(--brand); color:#241b00; font-weight:600; padding:.75rem 1.1rem; border-radius: 10px; text-decoration:none; font-size:.9rem; letter-spacing:.5px; box-shadow:0 4px 16px -4px rgba(0,0,0,.5); transition:.25s background, .25s transform;} 
.btn:hover {background: var(--brand-accent); transform:translateY(-2px);} 
.btn:active {transform:translateY(0);} 
.btn-outline {background:rgba(255,255,255,0.05); color:var(--text); border:1px solid rgba(255,255,255,.15);} 
.btn-outline:hover {background:rgba(255,255,255,0.12);} 

.pill-list {list-style:none; display:flex; flex-wrap:wrap; gap:.6rem; margin:1.4rem 0 0; padding:0;}
.pill-list li {background: linear-gradient(120deg, var(--bg-accent), var(--bg-alt)); border:1px solid rgba(255,255,255,0.06); padding:.55rem .85rem; font-size:.7rem; letter-spacing:.5px; text-transform:uppercase; border-radius: 30px; color:var(--text-soft); font-weight:500;}

.pub-list {counter-reset: pubs; list-style:none; margin:2rem 0 0; padding:0;}
.pub-list > li {position:relative; margin:0 0 1.25rem; padding-left:2.4rem; line-height:1.4;}
.pub-list > li:before {counter-increment: pubs; content: counter(pubs) "."; position:absolute; left:0; top:.1rem; color:var(--brand); font-family:var(--fw-serif); font-weight:600; font-size:1.05rem;}
.pub-list a {color: var(--link); text-decoration:none;}
.pub-list a:hover {text-decoration:underline;}

.course-list {columns: 2; column-gap: 2.2rem; list-style: none; padding:0; margin:1rem 0 1.5rem;}
.course-list li {break-inside:avoid; background: linear-gradient(120deg, var(--bg-accent), var(--bg-alt)); border:1px solid rgba(255,255,255,0.05); padding:.65rem .8rem; border-radius:10px; font-size:.8rem; font-weight:500; letter-spacing:.4px;}

.schedule-grid {display:grid; gap:1.5rem; grid-template-columns: repeat(auto-fit, minmax(160px,1fr)); margin-top:1.8rem;}
.schedule-grid .day {background: linear-gradient(140deg, var(--bg-accent), var(--bg-alt)); border:1px solid rgba(255,255,255,0.06); padding:1rem .9rem .8rem; border-radius:14px; box-shadow:0 4px 14px -6px rgba(0,0,0,.5);} 
.schedule-grid h3 {margin-top:0; font-size:1rem; letter-spacing:.5px; color: var(--brand);}
.schedule-grid ul {list-style:none; margin:0; padding:0; font-size:.75rem;}
.schedule-grid li {margin:.5rem 0; padding-left:.6rem; position:relative;}
.schedule-grid li:before {content:""; width:6px; height:6px; background: var(--brand); position:absolute; left:0; top:.55rem; border-radius:50%;}

.talks-list {columns: 2; column-gap:2.5rem; list-style:none; margin:1.8rem 0 0; padding:0; font-size:.8rem;}
.talks-list li {margin:0 0 .7rem; padding-left:.75rem; position:relative; break-inside:avoid;}
.talks-list li:before {content:""; position:absolute; left:0; top:.55rem; width:6px; height:6px; border-radius:50%; background: var(--brand);} 

/* Footer */
.site-footer {background:#0b0d10; padding:2.5rem 0; border-top:1px solid rgba(255,255,255,0.08); margin-top:2rem;}
.footer-grid {display:flex; flex-wrap:wrap; gap:2rem; justify-content:space-between; align-items:flex-start; max-width:var(--max-wide);}
.footer-nav {list-style:none; margin:0; padding:0; display:grid; gap:.4rem; font-size:.75rem;}
.footer-nav a {text-decoration:none; color:var(--text-soft);} 
.footer-nav a:hover {color:var(--link);} 

/* Links */
a {color: var(--link);} a:hover {color: var(--brand-accent);} a:focus {outline:2px solid var(--brand); outline-offset:2px;}

/* Media queries */
@media (max-width: 860px) {
  .course-list {columns:1;}
  .talks-list {columns:1;}
  .main-nav ul {position: absolute; top: 72px; right: 1rem; background: rgba(15,17,21,0.95); padding:1rem 1.2rem; flex-direction:column; align-items:stretch; border:1px solid rgba(255,255,255,0.08); border-radius:14px; min-width:220px; backdrop-filter:blur(10px); transform:translateY(-10px); opacity:0; pointer-events:none; transition:.3s opacity, .3s transform;}
  .main-nav ul.open {opacity:1; transform:translateY(0); pointer-events:auto;}
  .nav-toggle {display:block;}
}

@media (prefers-reduced-motion: reduce) {
  * {animation: none !important; transition: none !important;}
}

/* Accessibility helpers */
:focus-visible {outline: 2px solid var(--brand); outline-offset:2px;}

/* Print */
@media print {
  body {background:#fff; color:#000;}
  .site-header, .hero, .nav-toggle, .btn, .site-footer {display:none !important;}
  a {color:#000;}
  .section {padding:1.5rem 0;}
}