:root {
  --navy: #1A2E4A;
  --blue: #2E6DA4;
  --accent: #4A9DD4;
  --text: #2C2C2C;
  --muted: #6B7280;
  --light: #F4F6F9;
  --white: #FFFFFF;
  --border: #E5E9EF;
  --badge-bg: #E8F4FD;
  --badge-color: #2E6DA4;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: 'DM Sans', sans-serif; color: var(--text); background: var(--white); line-height: 1.7; }
h1, h2, h3, h4 { font-family: 'DM Serif Display', serif; font-weight: 400; line-height: 1.2; }
a { color: var(--accent); text-decoration: none; transition: color .2s; }
a:hover { color: var(--blue); }
img { max-width: 100%; display: block; }
.container { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
#navbar { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: rgba(255,255,255,0.96); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); min-height: 64px; display: flex; align-items: center; }
.nav-inner { display: flex; align-items: center; justify-content: space-between; width: 100%; max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.nav-logo { font-family: 'DM Serif Display', serif; font-size: 20px; color: var(--navy); }
.nav-logo span { color: var(--accent); }
.nav-links { display: flex; align-items: center; gap: 28px; list-style: none; }
.nav-links a { color: var(--text); font-size: 14px; font-weight: 500; letter-spacing: .01em; }
.nav-links a:hover, .nav-links a.active { color: var(--accent); }
.lang-switcher { display: flex; align-items: center; gap: 8px; margin-left: 20px; border-left: 1px solid var(--border); padding-left: 20px; }
.lang-btn { display: flex; align-items: center; gap: 5px; font-size: 13px; font-weight: 500; color: var(--muted); background: none; border: none; padding: 4px 8px; border-radius: 6px; font-family: 'DM Sans', sans-serif; }
.lang-btn:hover, .lang-btn.active { color: var(--navy); background: var(--badge-bg); }
.lang-btn .flag { font-size: 16px; }
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 4px; }
.hamburger span { display: block; width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: all .3s; }
.mobile-menu { display: none; position: fixed; top: 64px; left: 0; right: 0; background: rgba(255,255,255,0.98); border-bottom: 1px solid var(--border); padding: 16px 24px; z-index: 999; flex-direction: column; gap: 4px; }
.mobile-menu.open { display: flex; }
.mobile-menu a { color: var(--text); font-size: 16px; font-weight: 500; padding: 12px 0; border-bottom: 1px solid var(--border); }
.mobile-lang { display: flex; gap: 12px; padding-top: 12px; }
main { padding-top: 64px; }
.hero { min-height: calc(100vh - 64px); background: linear-gradient(135deg, var(--navy) 0%, #2E6DA4 100%); display: flex; align-items: center; padding: 80px 0; position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; top: -40%; right: -10%; width: 600px; height: 600px; border-radius: 50%; background: rgba(74,157,212,0.08); pointer-events: none; }
.hero::after { content: ''; position: absolute; bottom: -20%; left: -5%; width: 400px; height: 400px; border-radius: 50%; background: rgba(255,255,255,0.04); pointer-events: none; }
.hero-grid { display: grid; grid-template-columns: 1fr 380px; align-items: center; gap: 60px; position: relative; z-index: 1; }
.hero-tag { display: inline-flex; align-items: center; gap: 8px; background: rgba(74,157,212,0.18); color: #A8C8E8; border: 1px solid rgba(74,157,212,0.3); border-radius: 100px; padding: 6px 16px; font-size: 13px; font-weight: 500; margin-bottom: 24px; }
.hero-tag::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); flex-shrink: 0; }
.hero-content h1 { font-size: clamp(42px, 5vw, 62px); color: #fff; margin-bottom: 16px; }
.hero-content h1 span { color: #A8C8E8; }
.hero-subtitle { font-size: 20px; color: #A8C8E8; font-weight: 300; margin-bottom: 24px; }
.hero-text { font-size: 16px; color: #C8DDF0; line-height: 1.8; margin-bottom: 36px; max-width: 540px; }
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 36px; }
.btn-primary, .btn-outline, .btn-white { display: inline-block; border-radius: 8px; font-weight: 500; font-size: 15px; transition: all .25s; }
.btn-primary { background: var(--accent); color: #fff; padding: 13px 28px; }
.btn-primary:hover { background: #3a8ec4; color: #fff; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(74,157,212,.35); }
.btn-outline { border: 1.5px solid rgba(255,255,255,.5); color: #fff; padding: 13px 28px; }
.btn-outline:hover { border-color: #fff; background: rgba(255,255,255,.08); color: #fff; }
.btn-white { background: #fff; color: var(--navy); padding: 13px 28px; font-weight: 600; white-space: nowrap; }
.btn-white:hover { background: var(--badge-bg); color: var(--blue); transform: translateY(-2px); }
.hero-socials { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
.hero-socials a { color: #A8C8E8; display: flex; align-items: center; gap: 8px; font-size: 14px; }
.hero-socials a:hover { color: #fff; }
.icon { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; }
.hero-photo-wrap { display: flex; justify-content: center; align-items: center; }
.hero-photo { width: 320px; height: 380px; border-radius: 24px; background: rgba(255,255,255,0.08); border: 2px solid rgba(255,255,255,0.15); display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 16px; overflow: hidden; }
.hero-photo img { width:100%; height:100%; object-fit:cover; }
.hero-photo-placeholder { width: 120px; height: 120px; border-radius: 50%; background: rgba(74,157,212,0.25); display: flex; align-items: center; justify-content: center; font-family: 'DM Serif Display', serif; font-size: 48px; color: #A8C8E8; }
.hero-photo-label { font-size: 13px; color: rgba(168,200,232,0.65); text-align: center; padding: 0 20px; }
section.page-section { padding: 90px 0; }
.page-hero { background: linear-gradient(135deg, var(--navy), var(--blue)); padding: 90px 0; color: white; }
.page-hero h1 { font-size: clamp(40px,5vw,58px); margin-bottom: 12px; }
.page-hero p { color: #C8DDF0; max-width: 680px; font-size: 18px; }
.section-label { display: inline-block; font-size: 12px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; color: var(--accent); margin-bottom: 12px; }
.section-title { font-size: clamp(28px, 3.5vw, 40px); color: var(--navy); margin-bottom: 16px; }
.section-subtitle { font-size: 17px; color: var(--muted); max-width: 600px; line-height: 1.7; }
.divider { width: 48px; height: 3px; background: var(--accent); border-radius: 2px; margin: 20px 0 48px; }
.text-center { text-align: center; }.text-center .divider { margin-left: auto; margin-right: auto; }.text-center .section-subtitle { margin-left: auto; margin-right: auto; }
.about-grid, .contact-grid { display: grid; grid-template-columns: 1fr 340px; gap: 60px; align-items: start; }
.contact-grid { grid-template-columns: 1fr 360px; }
.about-text p { margin-bottom: 18px; line-height: 1.85; }
.info-card { background: var(--light); border-radius: 16px; padding: 28px; position: sticky; top: 84px; }
.info-card h4 { font-family:'DM Sans',sans-serif; font-size: 14px; font-weight: 600; color: var(--muted); letter-spacing: .05em; text-transform: uppercase; margin-bottom: 16px; }
.info-row { display: flex; align-items: flex-start; gap: 10px; margin-bottom: 12px; font-size: 14px; }
.info-row .label { color: var(--muted); min-width: 90px; flex-shrink: 0; font-size: 13px; }
.timeline { margin-top: 48px; }.timeline-title { font-size: clamp(22px, 3vw, 30px); color: var(--navy); margin-bottom: 32px; }
.timeline-item { display: grid; grid-template-columns: 120px 1fr; gap: 24px; padding-bottom: 32px; position: relative; }
.timeline-item:not(:last-child)::after { content: ''; position: absolute; left: 106px; top: 28px; bottom: 0; width: 1px; background: var(--border); }
.timeline-year { font-size: 13px; color: var(--muted); font-weight: 500; padding-top: 4px; text-align: right; }
.timeline-dot { position: absolute; left: 102px; top: 6px; width: 9px; height: 9px; border-radius: 50%; background: var(--accent); border: 2px solid var(--white); box-shadow: 0 0 0 2px var(--accent); }
.timeline-content h4 { font-size: 18px; color: var(--navy); margin-bottom: 4px; }.timeline-content .place { font-size: 14px; color: var(--blue); font-weight: 500; margin-bottom: 6px; }.timeline-content p { font-size: 14px; color: var(--muted); line-height: 1.65; }
.light-bg { background: var(--light); }
.research-grid, .projects-grid, .hobbies-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.research-card, .project-card, .hobby-card, .pub-card { background: var(--white); border: 1px solid var(--border); border-radius: 14px; transition: all .25s; }
.research-card, .project-card { padding: 28px; }.research-card:hover, .project-card:hover, .hobby-card:hover { border-color: var(--accent); box-shadow: 0 8px 32px rgba(26,46,74,.08); transform: translateY(-3px); }
.research-icon { width: 48px; height: 48px; border-radius: 12px; background: var(--badge-bg); display: flex; align-items: center; justify-content: center; margin-bottom: 16px; font-size: 24px; }
.research-card h3, .project-card h3 { font-size: 18px; color: var(--navy); margin-bottom: 8px; }.research-card p, .project-card p { font-size: 14px; color: var(--muted); line-height: 1.65; }
.featured-project { background: linear-gradient(135deg, var(--navy) 0%, #2E6DA4 100%); border-radius: 20px; padding: 48px; display: grid; grid-template-columns: 1fr 300px; gap: 48px; align-items: center; margin-bottom: 48px; }
.featured-project-badge, .tag, .project-card-badge, .pub-venue { display: inline-flex; align-items: center; gap: 6px; border-radius: 100px; font-size: 12px; font-weight: 500; }
.featured-project-badge { background: rgba(74,157,212,0.2); border: 1px solid rgba(74,157,212,0.4); color: #A8C8E8; padding: 5px 14px; margin-bottom: 16px; }
.featured-project h2 { font-size: 46px; color: #fff; margin-bottom: 8px; }.featured-project-sub { color: #A8C8E8; margin-bottom: 20px; }.featured-project p { color: #C8DDF0; font-size: 15px; line-height: 1.8; margin-bottom: 24px; }
.project-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 28px; }.tag { background: rgba(74,157,212,0.15); color: #A8C8E8; border: 1px solid rgba(74,157,212,0.25); border-radius: 6px; padding: 4px 12px; }
.project-meta-card { background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.12); border-radius: 14px; padding: 24px; }.meta-row { display:flex; justify-content:space-between; gap:18px; border-bottom:1px solid rgba(255,255,255,.08); padding:10px 0; font-size:14px; }.meta-row:last-child{border-bottom:none}.meta-row .key{color:rgba(168,200,232,.7)}.meta-row .val{color:#fff;font-weight:500;text-align:right}
.project-card { background: var(--light); display:flex; flex-direction:column; }.project-card-badge, .pub-venue { background: var(--badge-bg); color: var(--badge-color); border-radius: 6px; padding: 4px 10px; margin-bottom: 14px; width: fit-content; }
.project-link { margin-top: 18px; display:inline-flex; align-items:center; gap:6px; font-size:14px; font-weight:500; }
.pub-year-group { margin-bottom: 40px; }.pub-year-label { font-size: 13px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin-bottom: 16px; padding-bottom: 10px; border-bottom: 1px solid var(--border); }
.pub-card { border-left: 4px solid var(--accent); border-radius: 10px; padding: 22px 26px; margin-bottom: 14px; }.pub-card:hover{box-shadow:0 6px 24px rgba(26,46,74,.08)}.pub-title{font-family:'DM Serif Display',serif;font-size:17px;color:var(--navy);line-height:1.4;margin-bottom:6px}.pub-authors{font-size:13px;color:var(--muted);margin-bottom:12px}.pub-authors strong{color:var(--text)}.pub-links{display:flex;gap:12px;flex-wrap:wrap}.pub-link{display:inline-flex;align-items:center;gap:5px;font-size:13px;font-weight:500;color:var(--blue);border:1px solid var(--border);border-radius:6px;padding:4px 12px}.pub-link:hover{border-color:var(--accent);background:var(--badge-bg)}
.scholar-cta { background: var(--navy); border-radius: 16px; padding: 40px; display: flex; align-items: center; justify-content: space-between; gap: 24px; margin-top: 40px; flex-wrap: wrap; }.scholar-cta h3{font-size:24px;color:#fff;margin-bottom:6px}.scholar-cta p{font-size:15px;color:#A8C8E8}

.hobby-card {
  background: var(--light);
  overflow: hidden;
}

.hobby-img {
  height: 220px;
  width: 100%;
  overflow: hidden;
  display: block;
  font-size: 0;
  line-height: 0;
}

.hobby-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
}

.hobby-img.trek,
.hobby-img.mare,
.hobby-img.code {
  background: none;
}

.hobby-body {
  padding: 24px;
}

.hobby-body h3 {
  font-size: 22px;
  color: var(--navy);
  margin-bottom: 10px;
}

.hobby-body p {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.7;
}

.contact-form { display:flex; flex-direction:column; gap:16px; }.form-row { display:grid; grid-template-columns:1fr 1fr; gap:16px; }.form-group{display:flex;flex-direction:column;gap:6px}.form-group label{font-size:13px;font-weight:500}.form-group input,.form-group textarea{border:1.5px solid var(--border);border-radius:8px;padding:12px 14px;font-family:'DM Sans',sans-serif;font-size:15px;background:var(--white);resize:vertical}.form-group input:focus,.form-group textarea:focus{outline:none;border-color:var(--accent)}.form-group textarea{min-height:120px}.btn-form{background:var(--blue);color:#fff;border:none;border-radius:8px;padding:14px 28px;font-family:'DM Sans',sans-serif;font-size:15px;font-weight:500;cursor:pointer;transition:all .25s;width:100%}.btn-form:hover{background:var(--navy);transform:translateY(-2px)}
.contact-item{display:flex;align-items:flex-start;gap:12px;margin-bottom:18px;font-size:15px}.ci-label{font-size:12px;color:var(--muted);font-weight:500}.social-links{display:flex;flex-direction:column;gap:12px;margin-top:28px;padding-top:28px;border-top:1px solid var(--border)}.social-link{display:flex;align-items:center;gap:12px;padding:12px 14px;border:1px solid var(--border);border-radius:10px;background:var(--white);font-size:14px;font-weight:500;color:var(--text)}.social-link:hover{border-color:var(--accent);background:var(--badge-bg);transform:translateX(4px)}
footer { background: var(--navy); padding: 64px 0 32px; }.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:48px;margin-bottom:48px}.footer-logo{font-family:'DM Serif Display',serif;font-size:24px;color:#fff;margin-bottom:12px}.footer-logo span{color:var(--accent)}.footer-bio{font-size:14px;color:#A8C8E8;line-height:1.7;margin-bottom:20px}.footer-social{display:flex;gap:12px}.footer-social a{width:36px;height:36px;border-radius:8px;background:rgba(255,255,255,.08);display:flex;align-items:center;justify-content:center;color:#A8C8E8}.footer-social a:hover{background:rgba(74,157,212,.25);color:#fff}.footer-col h4{font-family:'DM Sans',sans-serif;font-size:13px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:rgba(255,255,255,.5);margin-bottom:16px}.footer-links{list-style:none}.footer-links li{margin-bottom:10px}.footer-links a{font-size:14px;color:#A8C8E8}.footer-links a:hover{color:#fff}.footer-divider{border:none;border-top:1px solid rgba(255,255,255,.1);margin-bottom:24px}.footer-bottom{display:flex;justify-content:space-between;align-items:center;font-size:13px;color:rgba(168,200,232,.5);flex-wrap:wrap;gap:8px}
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .6s ease, transform .6s ease; }.reveal.visible{opacity:1;transform:none}
@media (max-width: 900px) { .hero-grid,.about-grid,.contact-grid,.featured-project{grid-template-columns:1fr}.hero-photo-wrap{display:none}.info-card{position:static}.timeline-item{grid-template-columns:80px 1fr}.timeline-item::after{left:66px!important}.timeline-dot{left:62px}.footer-grid{grid-template-columns:1fr;gap:32px}.nav-links,.lang-switcher{display:none}.hamburger{display:flex}section.page-section{padding:64px 0}.featured-project{padding:32px} }
@media (max-width: 520px) { .hero-content h1{font-size:36px}.hero-btns,.form-row{grid-template-columns:1fr;flex-direction:column}.btn-primary,.btn-outline{text-align:center}.scholar-cta{flex-direction:column;text-align:center}.footer-bottom{flex-direction:column;text-align:center}.nav-inner{padding:0 18px}.container{padding:0 20px} }