:root{--color-page-bg:#f1f5f9;--color-surface:#fff;--color-surface-alt:#e0f2fe;--color-text:#1e293b;--color-heading:#020617;--color-muted-text:#475569;--color-border:#bae6fd;--color-primary:#0369a1;--color-primary-hover:#075985;--color-primary-text:#fff;color:var(--color-text);background-color:var(--color-page-bg);font-family:Arial,Helvetica,sans-serif}.dark{--color-page-bg:#020617;--color-surface:#0f172a;--color-surface-alt:#1e293b;--color-text:#e5e7eb;--color-heading:#f8fafc;--color-muted-text:#cbd5e1;--color-border:#334155;--color-primary:#38bdf8;--color-primary-hover:#0ea5e9;--color-primary-text:#020617}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background-color:var(--color-page-bg);color:var(--color-text);margin:0}.app{background-color:var(--color-page-bg);min-height:100vh;color:var(--color-text)}main{width:100%}section{padding:5rem 2rem}.section-content{max-width:1000px;margin:0 auto}h1,h2,h3{color:var(--color-heading);margin-top:0}p{line-height:1.6}.app,.navbar,.hero,.about,.projects,.contact,.project-card,.skills-list li,.button,.theme-toggle{transition:background-color .2s,color .2s,border-color .2s}.navbar{z-index:10;background-color:var(--color-surface);border-bottom:1px solid var(--color-border);position:sticky;top:0}.navbar-content{justify-content:space-between;align-items:center;max-width:1000px;margin:0 auto;padding:1rem 2rem;display:flex}.navbar-name{color:var(--color-heading);font-weight:700;text-decoration:none}.navbar-links{align-items:center;gap:1rem;display:flex}.navbar-links a{color:var(--color-muted-text);text-decoration:none}.navbar-links a:hover{color:var(--color-primary-hover)}.theme-toggle{border:1px solid var(--color-border);background:linear-gradient(135deg, var(--color-surface), var(--color-surface-alt));color:var(--color-heading);cursor:pointer;border-radius:999px;padding:.5rem .9rem;font-family:inherit;font-size:.9rem;font-weight:700;line-height:1;transition:background-color .2s,color .2s,border-color .2s,transform .15s,box-shadow .15s;box-shadow:0 4px 12px #0f172a1f}.theme-toggle:hover{border-color:var(--color-primary);color:var(--color-primary);transform:translateY(-1px);box-shadow:0 8px 18px #0f172a2e}.theme-toggle:active{transform:translateY(0);box-shadow:0 3px 8px #0f172a1f}.theme-toggle:focus-visible{outline:3px solid var(--color-primary);outline-offset:3px}.hero{background:var(--color-surface);align-items:center;min-height:80vh;display:flex}.hero-content{max-width:1000px;margin:0 auto}.hero h1{margin-bottom:1rem;font-size:clamp(2.5rem,6vw,4.5rem)}.hero-subtitle{max-width:650px;color:var(--color-muted-text);font-size:1.25rem}.hero-buttons{flex-wrap:wrap;gap:1rem;margin-top:2rem;display:flex}.button{border-radius:8px;padding:.85rem 1.2rem;font-weight:700;text-decoration:none;display:inline-block}.button-primary{background-color:var(--color-primary);color:var(--color-primary-text)}.button-primary:hover{background-color:var(--color-primary-hover)}.button-secondary{border:1px solid var(--color-primary);color:var(--color-primary)}.button-secondary:hover{background-color:var(--color-surface-alt)}.about{background-color:var(--color-page-bg)}.skills-list{flex-wrap:wrap;gap:.75rem;padding:0;list-style:none;display:flex}.skills-list li{background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:999px;padding:.5rem .9rem}.projects{background-color:var(--color-surface)}.project-grid{grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1.5rem;display:grid}.project-card{border:1px solid var(--color-border);background-color:var(--color-surface-alt);border-radius:12px;padding:1.5rem}.project-card a{color:var(--color-primary);font-weight:700}.project-card a:hover{color:var(--color-primary-hover)}.contact{background-color:var(--color-page-bg)}.contact-links{flex-wrap:wrap;gap:1rem;display:flex}.contact-links a{color:var(--color-primary);font-weight:700}.contact-links a:hover{color:var(--color-primary-hover)}@media (width<=700px){.navbar-content{flex-direction:column;align-items:flex-start;gap:.75rem}.navbar-links{flex-wrap:wrap}section{padding:4rem 1.25rem}}