/* Light + Soft theme with Dark Navy accents (modern & interactive) */
:root{
  --bg:#f8f9fa;            /* soft white */
  --fg:#1e1e1e;            /* soft black for text */
  --muted:#4b5563;         /* gray for secondary text */
  --primary:#0d1b2a;       /* deep navy (accent) */
  --primary-600:#1b263b;   /* medium navy */
  --primary-400:#415a77;   /* steel-blue hover / borders */
  --primary-200:#778da9;   /* pastel blue for subtle accents */
  --card:#ffffff;          /* cards surface */
  --border:#e5e7eb;        /* light border */
  --ring:#cbd5e1;          /* focus ring */
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0; font:16px/1.6 system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,"Noto Sans",sans-serif;
  color:var(--fg); background:var(--bg);
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
}
.container{max-width:1100px;margin:0 auto;padding:0 20px}
.nav{position:sticky;top:0;background:rgba(255,255,255,.8);backdrop-filter:saturate(160%) blur(10px);border-bottom:1px solid var(--border);z-index:50}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;padding:12px 0}
.nav a{color:var(--muted);text-decoration:none;margin:0 10px;transition:color .25s ease}
.nav a:hover{color:var(--primary)}
.brand{display:flex;gap:12px;align-items:center}
.brand .logo{width:32px;height:32px;border-radius:8px;background:linear-gradient(135deg,var(--primary),var(--primary-400));box-shadow:0 0 0 2px rgba(0,0,0,.04) inset}
.brand .title{font-weight:700;color:var(--primary);letter-spacing:.2px}

.btn{display:inline-block;padding:10px 14px;border-radius:12px;border:1px solid var(--border);color:#fff;text-decoration:none;transition:transform .15s ease,box-shadow .15s ease,background .3s ease}
.btn.primary{background:linear-gradient(135deg,var(--primary),var(--primary-600));border:none}
.btn.primary:hover{transform:translateY(-1px);box-shadow:0 10px 20px rgba(13,27,42,.15)}
.btn.ghost{background:transparent;color:var(--primary);border-color:var(--primary-200)}
.btn.ghost:hover{background:var(--primary);color:#fff;border-color:transparent}

.hero{padding:80px 0 40px;display:grid;grid-template-columns:1.2fr .8fr;gap:32px;align-items:center}
.hero h1{font-size:42px;line-height:1.15;margin:0 0 14px;color:#0a0f14}
.hero p{color:var(--muted);margin:0 0 24px}
.tag{display:inline-flex;gap:8px;align-items:center;font-size:13px;color:var(--muted);margin-bottom:10px}
.tag .dot{width:8px;height:8px;border-radius:50%;background:var(--primary)}

.card{background:var(--card);border:1px solid var(--border);border-radius:16px;box-shadow:0 6px 18px rgba(2,6,23,.06);transition:transform .2s ease, box-shadow .2s ease}
.card:hover{transform:translateY(-2px);box-shadow:0 14px 28px rgba(2,6,23,.10)}
.card.pad{padding:18px}

.grid{display:grid;gap:16px}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
.grid.cols-2{grid-template-columns:repeat(2,1fr)}
@media(max-width:920px){.hero{grid-template-columns:1fr}}

.section{padding:60px 0}
.section h2{margin:0 0 8px;color:#0a0f14}
.section .lead{color:var(--muted);margin:0 0 20px}

.kbd{font:12px ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono","Courier New",monospace;color:var(--primary);background:#eef2ff;border:1px solid var(--primary-200);border-radius:6px;padding:2px 6px}
.footer{padding:40px 0;color:var(--muted);border-top:1px solid var(--border)}

.input,.textarea{width:100%;padding:12px 14px;border-radius:12px;border:1px solid var(--border);background:#fff;color:#0f172a;transition:border-color .2s ease, box-shadow .2s ease}
.input:focus,.textarea:focus{outline:none;border-color:var(--primary-400);box-shadow:0 0 0 4px rgba(65,90,119,.15)}
.textarea{min-height:140px;resize:vertical}
.label{font-size:13px;color:var(--muted);margin-bottom:6px;display:block}

.row{display:grid;gap:14px;grid-template-columns:1fr 1fr}
@media(max-width:700px){.row{grid-template-columns:1fr}}

.alert{padding:12px 14px;border-radius:10px;border:1px solid var(--border);background:#fff;color:#0f172a;margin:10px 0}
.alert.ok{border-color:#c7f0d8;background:#edfdf4;color:#065f46}
.alert.err{border-color:#f9caca;background:#fff1f2;color:#9f1239}

.badge{display:inline-flex;gap:6px;align-items:center;padding:4px 8px;border-radius:999px;border:1px solid var(--border);color:var(--muted);font-size:12px;background:#fff}

.list{display:flex;flex-wrap:wrap;gap:8px}
.shadow-xl{box-shadow:0 20px 50px rgba(2,6,23,.12)}
.proj{padding:14px}
.proj h3{margin:6px 0 6px;font-size:18px}
.small{font-size:13px;color:var(--muted)}
table{width:100%;border-collapse:collapse}
th,td{padding:10px;border-bottom:1px solid var(--border);text-align:left;font-size:14px}
th{color:#0f172a}
code{background:#eef2ff;border:1px solid var(--primary-200);border-radius:6px;padding:2px 6px}

/* Reveal on scroll */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .6s ease, transform .6s ease}
.reveal.in{opacity:1;transform:none}