:root{
  --bg: #f7f8fb;
  --panel: #ffffff;
  --text: #0b1220;
  --muted: #5b6470;
  --accent: #2563eb;
  --accent-600: #1d4ed8;
  --glass: rgba(255,255,255,0.6);
  --radius: 12px;
  --container: 1100px;
}

[data-theme="dark"]{
  --bg: #07101a;
  --panel: #0f1724;
  --text: #e6eef8;
  --muted: #9aa6b2;
  --accent: #3b82f6;
  --accent-600: #2563eb;
  --glass: rgba(10,16,24,0.6);
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,Arial;
  background: linear-gradient(180deg,var(--bg),color-mix(in srgb,var(--bg) 96%, black 4%));
  color:var(--text);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  line-height:1.5;
  transition:background .25s ease,color .25s ease;
  padding-bottom:3rem;
}

/* container */
.container{max-width:var(--container);margin:0 auto;padding:0 1rem}

/* header */
.header{position:sticky;top:0;z-index:40;background:transparent;border-bottom:1px solid rgba(0,0,0,0.04);backdrop-filter:blur(6px)}
.header-inner{display:flex;align-items:center;gap:1rem;padding:.75rem 0}
.brand{margin:0;font-weight:700}
.brand-sub{margin:0;font-size:.8rem;color:var(--muted)}
.nav{display:flex;gap:1rem;flex:1}
.nav a{color:var(--muted);text-decoration:none;font-weight:600}
.nav a:hover,.nav a:focus{color:var(--text);text-decoration:underline;outline:none}
.actions{display:flex;align-items:center}
#theme-toggle{background:var(--glass);border:1px solid rgba(0,0,0,0.06);padding:.35rem .6rem;border-radius:8px;font-size:1rem;cursor:pointer}

/* hero */
.hero{padding:4rem 0 2.5rem;position:relative;text-align:center;overflow:hidden}
.hero-deco{position:absolute;left:0;right:0;top:0;height:180px;opacity:.9;pointer-events:none}
.hero-inner{position:relative;z-index:1;max-width:900px;margin:0 auto}
.hero h2{font-size:2.1rem;margin:.2rem 0}
.lead{color:var(--muted);font-size:1.02rem;margin-bottom:1rem}
.hero-ctas{display:flex;justify-content:center;gap:.75rem;margin-top:1rem}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.55rem .9rem;border-radius:10px;font-weight:600;text-decoration:none;cursor:pointer;border:0}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-600)}
.btn-secondary{background:transparent;color:var(--accent);border:1px solid var(--accent)}
.btn-secondary:hover{background:var(--accent);color:#fff}

/* projects */
.projects{padding:1.5rem 0 2rem}
.projects-header{display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap}
.filters{display:flex;align-items:center;gap:.75rem}
#search-input{padding:.5rem .75rem;border-radius:10px;border:1px solid rgba(0,0,0,0.06);min-width:220px}
.tags-container{display:flex;gap:.5rem;flex-wrap:wrap}
.tag-filter{padding:.25rem .5rem;border-radius:999px;border:1px solid rgba(0,0,0,0.06);background:transparent;color:var(--muted);cursor:pointer}
.tag-filter.active{background:var(--accent);color:#fff;border-color:var(--accent)}
.projects-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1rem;margin-top:1rem}

/* card */
.project-card{background:var(--panel);border:1px solid rgba(0,0,0,0.06);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:transform .22s ease,box-shadow .22s ease}
.project-card:hover,.project-card:focus-within{transform:translateY(-6px);box-shadow:0 18px 40px rgba(2,6,23,0.08)}
.project-card img{width:100%;height:160px;object-fit:cover;display:block;background:linear-gradient(90deg,rgba(0,0,0,0.03),rgba(0,0,0,0.06))}
.project-card-content{padding:1rem;display:flex;flex-direction:column;gap:.5rem;flex:1}
.project-card h3{margin:0;font-size:1.05rem}
.project-card p{margin:0;color:var(--muted);font-size:.95rem;flex:1}
.card-row{display:flex;align-items:center;justify-content:space-between;gap:.5rem;margin-top:.6rem}

/* tags small */
.tags{display:flex;gap:.4rem;flex-wrap:wrap;margin-top:.5rem}
.tag{padding:.18rem .45rem;border-radius:8px;border:1px solid rgba(0,0,0,0.06);color:var(--muted);font-size:.78rem}

/* about/contact */
.about,.contact{padding:2rem 0;text-align:center}
.contact-buttons{display:flex;gap:.75rem;justify-content:center;margin-top:1rem}

/* footer */
.footer{padding:1.25rem 0;border-top:1px solid rgba(0,0,0,0.04);text-align:center;color:var(--muted);margin-top:2rem;font-size:.95rem}

/* modal */
.hidden{display:none}
.modal{position:fixed;inset:0;display:none;align-items:center;justify-content:center;z-index:100}
.modal[aria-hidden="false"]{display:flex}
.modal-overlay{position:absolute;inset:0;background:rgba(2,6,23,0.5);backdrop-filter:blur(3px)}
.modal-panel{position:relative;width:min(960px,96%);background:var(--panel);border-radius:14px;border:1px solid rgba(0,0,0,0.06);overflow:hidden;box-shadow:0 30px 80px rgba(2,6,23,0.15);z-index:10}
.modal-close{position:absolute;right:.6rem;top:.6rem;background:transparent;border:0;font-size:1.1rem;cursor:pointer}
.modal-body{display:flex;gap:1rem;padding:1rem;align-items:flex-start}
.modal-gallery{width:42%;min-width:220px}
.modal-gallery img{width:100%;border-radius:8px;object-fit:cover}
.modal-thumbs{display:flex;gap:.4rem;margin-top:.5rem;flex-wrap:wrap}
.thumb{width:56px;height:40px;object-fit:cover;border-radius:6px;border:1px solid rgba(0,0,0,0.06);cursor:pointer;opacity:.9}
.thumb.active{outline:2px solid var(--accent);opacity:1}

/* modal content */
.modal-content{flex:1;display:flex;flex-direction:column;gap:.6rem}
.modal-actions{display:flex;gap:.6rem;margin-top:.6rem}

/* accessibility helpers */
.sr-only{position:absolute;height:1px;width:1px;overflow:hidden;clip:rect(1px,1px,1px,1px);white-space:nowrap}

/* small screens */
@media (max-width:780px){
  .nav{display:none}
  .modal-body{flex-direction:column}
  .modal-gallery{width:100%}
  .hero h2{font-size:1.6rem}
  .project-card img{height:140px}
}