:root{
  --bg:#f7f7fb;
  --card:#ffffff;
  --text:#0f1724;
  --muted:#6b7280;
  --accent:#2563eb;
  --radius:12px;
  --max-width:1100px;
  --h1-size:2.25rem;
  --lead-size:1.05rem;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;font-family:Inter,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;line-height:1.45}
.container{max-width:var(--max-width);margin:0 auto;padding:2rem}
.site-header{
  position:sticky;
  top:12px;
  z-index:60;
  padding:8px 0;
  backdrop-filter: blur(6px) saturate(120%);
  -webkit-backdrop-filter: blur(6px) saturate(120%);
  background: linear-gradient(180deg, rgba(255,255,255,0.6), rgba(255,255,255,0.45));
  border: 1px solid rgba(15,23,36,0.06);
  border-radius: 12px;
}
.header-inner{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px}
.brand{font-weight:700;color:var(--text);text-decoration:none;padding-left:6px}
.nav a{margin-left:1rem;color:var(--muted);text-decoration:none;padding:6px 10px;border-radius:8px;transition:background .18s ease,color .12s ease}
.nav a:hover{background:rgba(15,23,36,0.06);color:var(--text)}
.nav a:focus-visible{outline:2px solid rgba(37,99,235,0.18);outline-offset:2px;border-radius:8px}
.header-right{display:flex;justify-content:flex-end;align-items:center;gap:.6rem}
.cv-btn{background:linear-gradient(90deg,var(--accent),#7c3aed);color:white;padding:.5rem .9rem;border-radius:999px;text-decoration:none;font-weight:700;box-shadow:0 8px 20px rgba(124,58,237,0.12)}
.cv-btn:hover{transform:translateY(-2px)}
#theme-toggle{background:transparent;border:0;padding:.4rem .6rem;border-radius:8px;cursor:pointer}
.mobile-menu-toggle{display:none;background:transparent;border:0;font-size:20px;padding:6px}
.social{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:8px;color:var(--muted);text-decoration:none}
.social svg{display:block}
.social:hover{background:rgba(2,6,23,0.03)}

/* Specific social brand tweaks */
.social.linkedin{color:#0a66c2}
.social.github{color:var(--text)}
.header-right .social{width:38px;height:38px}
.contact-socials .social{width:36px;height:36px;border-radius:8px}
.social:focus{outline:2px solid rgba(37,99,235,0.16);outline-offset:2px}

.hero{padding:4rem 0}
.hero-inner{display:flex;gap:2rem;align-items:center}
.avatar{width:140px;height:140px;border-radius:9999px;border:6px solid rgba(255,255,255,0.9);box-shadow:0 8px 30px rgba(2,6,23,0.12);background:linear-gradient(135deg,#eef2ff,#fff);object-fit:cover}
.hero-right h1{margin:0 0 .5rem 0;font-size:var(--h1-size);line-height:1.05}
.lead{color:var(--muted);margin-top:0;font-size:var(--lead-size)}
.meta{color:var(--muted)}
.btn{display:inline-block;padding:.7rem 1.15rem;background:linear-gradient(90deg,var(--accent),#60a5fa);color:white;border-radius:12px;text-decoration:none;box-shadow:0 6px 18px rgba(37,99,235,0.12);transition:transform .18s ease,box-shadow .18s ease}
.btn:hover{transform:translateY(-3px);box-shadow:0 18px 40px rgba(37,99,235,0.14)}
.btn-secondary{background:transparent;color:var(--accent);border:1px solid rgba(37,99,235,0.12);margin-left:.5rem;padding:.55rem .95rem;border-radius:10px}

/* Accessibility: visible keyboard focus */
:focus{outline:none}
:focus-visible{outline:3px solid rgba(37,99,235,0.18);outline-offset:3px;border-radius:8px}

/* Improved form controls */
.contact-form input,.contact-form textarea{padding:.75rem .9rem;border-radius:10px;border:1px solid rgba(11,15,26,0.06);background:var(--card);color:var(--text);font-size:1rem}
.contact-form label{display:block;margin-bottom:.25rem}

/* Hero chips */
.hero-chips{margin-top:.9rem;display:flex;flex-wrap:wrap;gap:.5rem}
.chip{background:#eef2ff;padding:.35rem .6rem;border-radius:999px;font-size:.85rem;color:var(--accent);border:1px solid rgba(37,99,235,0.06)}

/* Skip link for keyboard users */
.skip-link{position:absolute;left:-999px;top:auto;width:1px;height:1px;overflow:hidden}
.skip-link:focus{position:static;left:auto;top:1rem;width:auto;height:auto;padding:.5rem 1rem;background:var(--accent);color:#fff;border-radius:6px;z-index:1000}

/* Profile picture container */
.profile-picture img{width:140px;height:140px;object-fit:cover;border-radius:20px;border:1px solid rgba(0,0,0,0.06)}
.hero-graphic{position:absolute;left:0;top:0;width:40%;height:120px;transform:translate(-10%, -20%);pointer-events:none}

/* Slightly larger profile picture on wider screens */
@media(min-width:900px){
  .profile-picture img{width:180px;height:180px;border-radius:24px}
}

/* Contact form */
.contact-form{display:grid;gap:.6rem;max-width:680px}
.contact-form label{font-weight:600;color:var(--muted);font-size:.95rem}
.contact-form input,.contact-form textarea{padding:.6rem .75rem;border-radius:8px;border:1px solid rgba(11,15,26,0.06);background:var(--card);color:var(--text)}
.contact-form input:focus,.contact-form textarea:focus{outline:2px solid rgba(37,99,235,0.12);box-shadow:0 0 0 4px rgba(37,99,235,0.06)}
.form-actions{display:flex;gap:.5rem;align-items:center}
.muted{color:var(--muted);font-size:.95rem}

.about, .skills, .projects, .contact{background:transparent;padding:2rem 0}
.about-card {
  background: linear-gradient(120deg, #f8fafc 80%, #e0e7ef 100%);
  border-radius: 16px;
  box-shadow: 0 8px 32px rgba(37,99,235,0.07);
  padding: 2rem 2.2rem;
  margin: 1.5rem 0 2.5rem 0;
  display: flex;
  flex-wrap: wrap;
  gap: 2.5rem 2rem;
  align-items: flex-start;
}

/* Testimonials */
.testimonials { padding-top: 1rem; }
.testimonials-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1rem;margin-top:1rem}
.testimonial-card{display:flex;gap:1rem;background:var(--card);padding:1rem;border-radius:12px;align-items:flex-start;box-shadow:0 8px 24px rgba(11,15,26,0.06)}
.testimonial-card .avatar{width:52px;height:52px;border-radius:12px;background:linear-gradient(90deg,var(--accent),#60a5fa);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700}
.testimonial-body .quote{font-style:italic;margin:0 0 .5rem 0}
.testimonial-body .author{margin:0;color:var(--muted);font-size:.95rem}

@media (max-width:700px){
  .testimonials-grid{grid-template-columns:1fr}
}
.about-summary {
  flex: 2 1 320px;
  font-size: 1.13rem;
  color: var(--text);
  min-width: 260px;
}
.about-summary strong {
  font-size: 1.18em;
  color: var(--accent);
}
.about-highlights {
  flex: 3 1 320px;
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  min-width: 260px;
}
.about-highlight {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(37,99,235,0.04);
  padding: 1.1rem 1.3rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  min-width: 180px;
  flex: 1 1 180px;
}
.about-icon {
  font-size: 2rem;
  margin-right: 0.5rem;
  color: var(--accent);
  flex-shrink: 0;
  line-height: 1;
}
.about-highlight strong {
  color: var(--text);
  font-size: 1.05em;
}
@media (max-width: 700px) {
  .about-card {
    flex-direction: column;
    padding: 1.2rem 1rem;
    gap: 1.2rem;
  }
  .about-highlights {
    flex-direction: column;
    gap: 1rem;
  }
}
.skill-list{display:flex;flex-wrap:wrap;gap:.6rem;list-style:none;padding:0;margin:0}
.skill-list li{background:var(--card);padding:.5rem .8rem;border-radius:8px;border:1px solid rgba(0,0,0,0.04)}

/* Skills grid */
.skills-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1rem;margin-top:1rem}
.skill{background:var(--card);padding:1rem;border-radius:12px;border:1px solid rgba(11,15,26,0.04);box-shadow:0 6px 18px rgba(11,15,26,0.03)}
.skill-title{display:flex;justify-content:space-between;align-items:center;font-weight:600;margin-bottom:.6rem}
.skill-percent{color:var(--muted);font-weight:700}
.skill-bar{background:linear-gradient(90deg, rgba(11,15,26,0.02), rgba(11,15,26,0.03));height:12px;border-radius:999px;overflow:hidden}
.skill-bar-fill{height:100%;width:0%;border-radius:999px;background:linear-gradient(90deg,var(--accent),#7dd3fc);transition:width 1.2s cubic-bezier(.2,.9,.2,1)}

/* Color variations for fills (CSS variables allow easy theme changes) */
.skill[data-level="92"] .skill-bar-fill{background:linear-gradient(90deg,#f97316,#fb923c)}
.skill[data-level="88"] .skill-bar-fill{background:linear-gradient(90deg,#2563eb,#60a5fa)}
.skill[data-level="84"] .skill-bar-fill{background:linear-gradient(90deg,#10b981,#34d399)}
.skill[data-level="78"] .skill-bar-fill{background:linear-gradient(90deg,#8b5cf6,#a78bfa)}
.skill[data-level="74"] .skill-bar-fill{background:linear-gradient(90deg,#f59e0b,#fbbf24)}
.skill[data-level="70"] .skill-bar-fill{background:linear-gradient(90deg,#ef4444,#fb7185)}

@media (prefers-reduced-motion: reduce){
  .skill-bar-fill{transition:none}
}

/* Screen-reader only helper */
.sr-only{position:absolute!important;height:1px;width:1px;overflow:hidden;clip:rect(1px,1px,1px,1px);white-space:nowrap;border:0;padding:0;margin:-1px}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:1rem}
.card{background:linear-gradient(180deg, rgba(255,255,255,0.8), rgba(255,255,255,0.7));padding:1rem;border-radius:var(--radius);box-shadow:0 12px 30px rgba(11,15,26,0.08);border:1px solid rgba(255,255,255,0.6);transition:transform .18s ease,box-shadow .18s ease}
.card:hover{transform:translateY(-6px);box-shadow:0 30px 60px rgba(11,15,26,0.12)}
.card h3{margin:.25rem 0;display:flex;align-items:center;gap:.5rem}
.project-badge{display:inline-block;margin-left:.5rem;padding:.15rem .5rem;border-radius:999px;font-size:.75rem;font-weight:700;color:#fff;background:#6b7280}
.project-badge[aria-hidden="true"]{display:none}
.project-badge[data-status="pre-register"]{background:linear-gradient(90deg,#f97316,#fb923c)}
.project-badge[data-status="published"]{background:linear-gradient(90deg,#10b981,#34d399)}
.project-actions{margin-top:.75rem}
.project-actions .btn{margin-right:.4rem}
.card p{color:var(--muted);font-size:.95rem}
.card .tech{margin-top:.5rem;display:flex;flex-wrap:wrap;gap:.4rem}
.tag{font-size:.8rem;background:#f3f4f6;padding:.2rem .5rem;border-radius:6px;color:#374151}

/* Project thumbnail */
.card .thumb{width:100%;height:200px;border-radius:10px;overflow:hidden;margin-bottom:.75rem;background:#f3f4f6;display:flex;align-items:center;justify-content:center;position:relative}
.card .thumb img{width:100%;height:100%;object-fit:cover;display:block;filter:brightness(.92);transition:transform .4s ease}
.card .thumb:hover img{transform:scale(1.03)}
.card .thumb .overlay{position:absolute;left:0;right:0;bottom:0;padding:.6rem 1rem;background:linear-gradient(180deg, rgba(0,0,0,0), rgba(2,6,23,0.6));color:#fff;font-weight:700}

/* Modal styles */
.modal{position:fixed;inset:0;display:none;align-items:center;justify-content:center;z-index:1200}
.modal[aria-hidden="false"]{display:flex}
.modal-backdrop{position:absolute;inset:0;background:rgba(2,6,23,0.6)}
.modal-panel{position:relative;max-width:900px;width:94%;background:var(--card);border-radius:12px;padding:1.25rem;box-shadow:0 20px 60px rgba(11,15,26,0.6);z-index:2}
/* stronger contrast for modal in dark theme */
:root.dark .modal-panel{background:#0b1220;color:var(--text);border:1px solid rgba(255,255,255,0.04)}
.modal-close{position:absolute;right:.6rem;top:.4rem;background:transparent;border:0;font-size:26px;color:var(--muted);cursor:pointer}
.modal-content img{max-width:100%;border-radius:8px;margin:.5rem 0;max-height:420px;object-fit:cover}
.modal-content h3{margin-top:0}
.modal-content .tech{margin-top:.5rem}
.modal-actions .btn{margin-right:.5rem}

.site-footer{padding:2rem 0;color:var(--muted);text-align:center}
.site-footer .credit{margin-top:.4rem;font-size:.85rem;color:var(--muted)}
.site-footer .socials{margin-top:.5rem;display:flex;gap:.4rem;justify-content:center}

@media(max-width:800px){
  .hero-inner{flex-direction:column;text-align:center}
  .header-inner{flex-direction:row}
}

/* Dark theme */
:root.dark{--bg:#0b1220;--card:#071126;--text:#e6eef8;--muted:#9aa6bf;--accent:#60a5fa}

/* Mobile menu */
#mobile-menu{display:none;position:fixed;inset:0;left:100%;width:100%;height:100%;background:linear-gradient(180deg,#ffffff,#f7fbff);padding:2.2rem 1.2rem;box-shadow:0 8px 28px rgba(16,24,40,0.06);transition:left .32s cubic-bezier(.22,.9,.35,1);z-index:80}
#mobile-menu nav{display:flex;flex-direction:column;gap:12px;align-items:flex-start}
#mobile-menu a{padding:12px;border-radius:8px;color:var(--text);text-decoration:none;font-size:1.05rem}

.mobile-menu-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
.mobile-menu-header strong{font-size:1.05rem}
#mobile-menu-close{background:transparent;border:0;font-size:28px;line-height:1;padding:6px;cursor:pointer}

/* active link highlight */
.mobile-link.active{background:linear-gradient(90deg,var(--accent),#60a5fa);color:#fff;border-radius:8px}
.mobile-link:focus{outline:2px solid rgba(37,99,235,0.18);outline-offset:2px}

@media (max-width:900px){
  .header-inner{grid-template-columns:1fr auto}
  .header-center{display:none}
  .mobile-menu-toggle{display:inline-flex}
  /* larger touch targets */
  .header-right .cv-btn, .header-right #theme-toggle, .header-right .mobile-menu-toggle{padding:10px 12px;font-size:16px}
  /* mobile menu slide-in */
  #mobile-menu{left:100%}
  #mobile-menu.open{left:0;display:block}
  /* reduce container padding on small screens */
  .container{padding:1rem}
}

@media (max-width:700px){
  /* modal becomes near full-screen for easier reading on phones */
  .modal-panel{width:100%;height:100%;border-radius:0;padding:0;display:flex;flex-direction:column}
  .modal-content{overflow:auto;padding:1rem}
  .hero-left{display:flex;justify-content:center}
  .hero-graphic{display:none}
  .avatar{width:120px;height:120px}
  .btn{width:100%;display:block;text-align:center}
  .btn + .btn-secondary{margin-top:.6rem;margin-left:0}
}