:root{
  --bg:#0e1217; --card:#121722; --text:#e7ecf3; --muted:#a9b3c1;
  --line:#243043; --accent:#4da3ff; --shadow:0 10px 30px rgba(0,0,0,.35);
}
:root.light{
  --bg:#f7f9fc; --card:#ffffff; --text:#182132; --muted:#5f6b7b;
  --line:#e7edf5; --accent:#007acc; --shadow:0 10px 24px rgba(0,0,0,.08);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:'Inter',system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,'Helvetica Neue',Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.55;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
img,video{max-width:100%;height:auto}
a{color:var(--accent);text-decoration:none} a:hover{text-decoration:underline}
.container{width:min(1100px,92%);margin:0 auto}
.row{display:flex;align-items:center;gap:1rem} .space-between{justify-content:space-between}

.site-header{position:sticky;top:0;z-index:10;background:rgba(14,18,23,.7);backdrop-filter:saturate(140%) blur(12px);border-bottom:1px solid var(--line)}
.site-header .brand{font-weight:700;letter-spacing:.3px}
.site-header .brand span{color:var(--accent)}
.nav{display:flex;gap:.8rem;align-items:center;flex-wrap:wrap}
.nav a{font-weight:500;color:var(--text);opacity:.85} .nav a:hover{opacity:1}
.toggles{display:flex;align-items:center;gap:.5rem}
#themeToggle{background:transparent;border:1px solid var(--line);color:var(--text);padding:.35rem .6rem;border-radius:8px;cursor:pointer}
.lang-switch{display:flex;align-items:center;gap:.25rem;border:1px solid var(--line);padding:.2rem .45rem;border-radius:8px;background:var(--card)}
.lang{background:transparent;color:var(--text);border:none;cursor:pointer;font-weight:600;opacity:.85}
.lang:hover{opacity:1}

/* Mobile nav toggle button */
.menu-toggle{display:none;font-size:1.2rem;line-height:1;color:var(--text);background:transparent;border:1px solid var(--line);padding:.4rem .6rem;border-radius:8px;cursor:pointer}
.nav-check{display:none}

.hero{padding:4.75rem 0 2.25rem}
.hero-grid{display:grid;grid-template-columns:1.6fr .9fr;gap:2rem;align-items:center}
@media(max-width:900px){.hero-grid{grid-template-columns:1fr}}
.hero h1{font-size:clamp(1.75rem,2.5vw+1rem,2.5rem);margin:.5rem 0}
.lead{color:var(--muted);max-width:70ch}
.cta{display:flex;gap:.75rem;margin:1rem 0 0}
.btn{display:inline-block;border:1px solid var(--line);padding:.6rem 1rem;border-radius:10px}
.btn.primary{background:var(--accent);color:#fff;border-color:var(--accent)} .btn.ghost{color:var(--text)}
.hero-photo{display:flex;flex-direction:column;gap:.5rem;align-items:center}
.hero-photo img{width:clamp(140px,40vw,220px);height:clamp(140px,40vw,220px);object-fit:cover;border-radius:999px;border:1px solid var(--line);box-shadow:var(--shadow)}

.section{padding:2.6rem 0;border-top:1px dashed var(--line)}
.section h2{font-size:1.5rem;margin:0 0 .75rem 0}
.muted{color:var(--muted)}
.chips{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1rem}
.chip{background:var(--card);border:1px solid var(--line);padding:.35rem .6rem;border-radius:999px;font-size:.9rem;color:var(--muted)}

.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1rem;margin-top:1rem}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:1rem;box-shadow:var(--shadow)}
.card header h3{margin:.3rem 0 .25rem 0}
.card .sub{color:var(--muted);font-size:.9rem;margin-bottom:.4rem}
.card ul{margin:.6rem 0 0 1.1rem;color:var(--muted)}

.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1rem;margin-top:1rem}
.tile{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:1rem;box-shadow:var(--shadow)}
.tags{display:flex;gap:.4rem;flex-wrap:wrap;margin-top:.4rem}
.tags span{font-size:.8rem;color:var(--muted);border:1px solid var(--line);padding:.2rem .45rem;border-radius:999px}

.skills{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1rem;margin-top:1rem}
.list{color:var(--muted);margin:.4rem 0 0 1.1rem} .list li{margin:.35rem 0}

.site-footer{border-top:1px solid var(--line);padding:1rem 0;color:var(--muted)}

/* Contact form */
.contact-form{display:grid;gap:.7rem;margin:1rem 0 1.2rem}
.contact-form input,.contact-form textarea{
  background:var(--card); color:var(--text);
  border:1px solid var(--line); border-radius:10px;
  padding:.65rem .8rem; outline:none;
}
.contact-form input:focus,.contact-form textarea:focus{border-color:var(--accent)}
.contact-form .btn{justify-self:start}

/* Print-friendly */
@media print {
  #themeToggle,.lang-switch{display:none}
  .site-header{position:static;background:transparent;border:none}
}

/* Responsive tweaks */
@media(max-width:768px){
  .site-header .container{flex-wrap:wrap;gap:.4rem 1rem}
  .menu-toggle{display:block;margin-left:auto}
  /* Collapse nav by default; expand when toggled */
  .nav{display:none;width:100%;flex-direction:column;align-items:flex-start;gap:.5rem;padding-top:.5rem}
  #navCheck:checked + .menu-toggle + .nav{display:flex}
  .nav a{padding:.4rem 0}
  .hero{padding:3.5rem 0 1.75rem}
  .section{padding:2.1rem 0}
}

@media(max-width:560px){
  .row{flex-wrap:wrap}
  .cta{flex-direction:column}
  .btn{width:100%;text-align:center}
  .grid{grid-template-columns:1fr}
  .cards{grid-template-columns:1fr}
  .skills{grid-template-columns:1fr}
}