:root{--bg: #0b0e14; --text: #e6e6e6; --muted:#b0b3b8; --accent:#7c5cff; --card:#111520; --border:#22283a; --link:#9db4ff; --glow:#7c5cff40; --shadow: 0 8px 24px rgba(0,0,0,.35)}
:root.light{--bg:#ffffff; --text:#0e1320; --muted:#5a6272; --accent:#5b3fff; --card:#f7f8fa; --border:#e6e9ef; --link:#3a66ff; --glow:#5b3fff33; --shadow: 0 8px 24px rgba(0,0,0,.08)}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:'Mona-Sans', 'Mona Sans', ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, sans-serif; background:radial-gradient(1200px 800px at 10% -10%, rgba(124,92,255,.18), transparent 60%), radial-gradient(1000px 700px at 120% 0%, rgba(0,168,255,.14), transparent 55%), var(--bg); color:var(--text); line-height:1.6}
img{max-width:100%;height:auto}
a{color:var(--link);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:2px solid var(--accent); outline-offset:2px; border-radius:8px}

.site-header{position:sticky;top:0;background:rgba(15,18,28,.55);backdrop-filter:saturate(1.2) blur(12px);border-bottom:1px solid var(--border);z-index:50;box-shadow:var(--shadow)}
.site-header,.site-footer{display:flex;align-items:center;justify-content:space-between;padding:12px 20px}
.logo{font-weight:800;color:var(--text);letter-spacing:.2px}
.site-nav{display:flex;align-items:center;gap:12px}
.nav-toggle{display:none}
.nav-menu{display:flex;list-style:none;gap:14px;margin:0;padding:0}
.nav-menu a,.nav-menu button{padding:8px 10px;border-radius:10px;border:1px solid transparent;background:none;color:var(--text);transition:all .2s ease}
.nav-menu a:hover,.nav-menu button:hover{border-color:var(--border);background:var(--card);box-shadow:0 6px 18px var(--glow)}
.theme-toggle{cursor:pointer}

.site-main{padding:28px 20px;max-width:1100px;margin:0 auto}
.section{padding:56px 0;border-top:1px solid var(--border)}
.section h2{font-size:clamp(22px,3.2vw,28px);margin:0 0 6px}
.subtitle{color:var(--muted);margin:0 0 18px;font-size:14px}
.hero{padding:56px 0 28px}
.hero h1{font-size:clamp(32px,5vw,56px);line-height:1.15;margin:0 0 8px}
.accent{background:linear-gradient(90deg, var(--accent), #4cc9ff); -webkit-background-clip:text; background-clip:text; color:transparent}
.tagline{color:var(--muted);margin:0 0 18px}
.hero-ctas{display:flex;gap:12px;flex-wrap:wrap}

.btn{display:inline-block;border:1px solid var(--border);padding:11px 16px;border-radius:12px;color:var(--text);background:var(--card);box-shadow:0 8px 24px rgba(0,0,0,.15);transition:transform .15s ease, box-shadow .2s ease, background .2s}
.btn:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(0,0,0,.28)}
.btn:active{transform:translateY(0)}
.btn.primary{background:linear-gradient(135deg, var(--accent), #4cc9ff);border-color:transparent;color:#fff;box-shadow:0 10px 30px var(--glow)}

.about .skills{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:10px;padding:0;list-style:none}
.projects-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px}
.project-card{border:1px solid var(--border);background:linear-gradient(180deg, rgba(255,255,255,.02), rgba(255,255,255,.0));backdrop-filter:blur(8px);border-radius:16px;padding:18px;display:flex;flex-direction:column;gap:10px;box-shadow:var(--shadow);transition:transform .18s ease, box-shadow .2s ease, border-color .2s}
.project-card:hover{transform:translateY(-4px);box-shadow:0 14px 36px rgba(0,0,0,.35);border-color:transparent}

.cards-3{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px}

.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:2px}
.chip{display:inline-flex;align-items:center;gap:6px;padding:6px 10px;border-radius:999px;border:1px solid var(--border);background:var(--card);color:var(--text);font-size:12px}
.chip::before{content:'';width:6px;height:6px;border-radius:50%;background:var(--accent);box-shadow:0 0 12px var(--glow)}

.contact-form{display:grid;gap:12px;max-width:560px}
.contact-form input,.contact-form textarea{width:100%;padding:12px 14px;border-radius:12px;border:1px solid var(--border);background:var(--card);color:var(--text);transition:border-color .2s, box-shadow .2s}
.contact-form input:focus,.contact-form textarea:focus{border-color:var(--accent);box-shadow:0 0 0 4px var(--glow)}
.contact-form button{justify-self:start}

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

.socials{display:flex;gap:12px;align-items:center;margin-top:10px;flex-wrap:wrap}
.socials a{display:inline-flex;align-items:center;gap:8px;padding:8px 10px;border-radius:10px;border:1px solid var(--border);background:var(--card);color:var(--text);transition:all .2s}
.socials a:hover{border-color:transparent;box-shadow:0 10px 26px var(--glow);transform:translateY(-2px)}

/* Back to top button */
.to-top{position:fixed;right:16px;bottom:16px;border:1px solid var(--border);background:var(--card);color:var(--text);border-radius:999px;padding:10px 12px;box-shadow:var(--shadow);cursor:pointer;opacity:0;transform:translateY(12px);pointer-events:none;transition:opacity .2s, transform .2s}
.to-top.show{opacity:1;transform:translateY(0);pointer-events:auto}

@media (max-width:720px){
  .nav-toggle{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--border);background:var(--card);padding:8px 10px;border-radius:10px;color:var(--text)}
  .nav-menu{position:absolute;right:12px;top:56px;flex-direction:column;background:var(--card);padding:10px;border:1px solid var(--border);border-radius:12px;display:none;box-shadow:var(--shadow)}
  .nav-menu[aria-expanded="true"],.nav-menu.open{display:flex}
}