/* ====== Design Tokens ====== */
:root{
  --bg: #ffffff;
  --ink: #0a0a0a;
  --muted: #6b7280;            /* subtle gray for secondary text */
  --rule: #e5e7eb;             /* hairline rules */
  --accent: #0ea5e9;           /* soft, refined accent (sky) */
  --accent-ink: #0b4e66;
  --container: 1100px;

  --ff-sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  --ff-serif: "Playfair Display", ui-serif, Georgia, "Times New Roman", serif;

  --step--1: clamp(.9rem,.8rem + .3vw,1rem);
  --step-0: clamp(1rem, .9rem + .5vw, 1.125rem);
  --step-1: clamp(1.25rem, 1.1rem + .8vw, 1.5rem);
  --step-2: clamp(1.6rem, 1.2rem + 1.8vw, 2.25rem);
  --step-3: clamp(2rem, 1.5rem + 2.6vw, 3rem);
  --step-4: clamp(2.6rem, 2rem + 3.8vw, 4rem);

  --radius: 18px;
  --shadow: 0 8px 28px rgba(0,0,0,.06);
  --speed: 300ms;
}

/* ====== Base ====== */
*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *{ animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration:0.01ms !important; }
}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font:400 var(--step-0)/1.6 var(--ff-sans);
  text-rendering:optimizeLegibility;
}
img{ max-width:100%; display:block; height:auto; }
a{ color:inherit; text-decoration:none; }
a:hover{ text-decoration:underline; text-decoration-thickness: 1px; }

.container{ width:min(100%, var(--container)); margin-inline:auto; padding-inline: clamp(1rem, 3vw, 2rem); }
.flow > * + *{ margin-top: 1rem; }

/* ====== Skip link ====== */
.skip-link{
  position:absolute; left:-999px; top:auto;
  background:var(--ink); color:#fff; padding:.5rem .75rem; border-radius:.375rem; z-index:999;
}
.skip-link:focus{ left:1rem; top:1rem; }

/* ====== Header / Nav ====== */
.site-header{
  border-bottom:1px solid var(--rule);
}

.masthead{
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.9);
  backdrop-filter: saturate(180%) blur(10px);
}

.masthead{
  display:flex; align-items:center; justify-content:space-between;
  padding-block: .8rem;
}
.brand{
  display:grid; grid-template-columns:auto 1fr; column-gap:.75rem; align-items:center;
  text-decoration:none;
}
.brand-initials{
  display:inline-grid; place-items:center;
  width:2.25rem; height:2.25rem; border:1px solid var(--ink);
  border-radius:50%; font-weight:800; font-family:var(--ff-sans);
}
.brand-name{ font-weight:800; letter-spacing:.02em; }
.brand-role{ font-size: var(--step--1); color:var(--muted); }

.site-nav ul{
  list-style:none; display:flex; gap:1.25rem; padding:0; margin:0;
}
.site-nav a[data-scroll]{ position:relative; }
.site-nav a[data-scroll]::after{
  content:""; position:absolute; left:0; right:0; bottom:-6px; height:2px;
  background:currentColor; transform:scaleX(0); transform-origin:left; transition:transform var(--speed) ease;
}
.site-nav a[data-scroll]:hover::after{ transform:scaleX(1); }
.nav-toggle{ display:none; background:none; border:none; font-size:1.25rem; }

@media (max-width: 760px){
  .site-nav ul{ display:none; position:absolute; right:1rem; top:60px; background:#fff; border:1px solid var(--rule); box-shadow:var(--shadow); padding:1rem; border-radius:.75rem; flex-direction:column; }
  .nav-toggle{ all: unset; display:inline-block; }
  .site-nav[aria-expanded="true"] ul{ display:flex; }
}

.nav-toggle:hover {
  cursor: pointer;
}

/* ====== Hero ====== */
.hero{ padding-block: clamp(2rem, 6vw, 5rem); }
.kicker{
  text-transform:uppercase; letter-spacing:.15em; font-weight:700; font-size:.8rem; color:var(--muted);
}
.hero-title{
  font: 800 var(--step-4)/1.1 var(--ff-serif);
  letter-spacing:.01em; margin:.5rem 0 1rem;
}
.hero-sub{ max-width: 55ch; color:var(--muted); }

/* ====== Sections ====== */
.section{ padding-block: clamp(2.5rem, 6vw, 5rem); border-top:1px solid var(--rule); }
.section:first-of-type{ border-top:none; }
.section-title{
  font:800 var(--step-2)/1.2 var(--ff-serif);
  margin:0 0 1.5rem 0;
}

/* ====== About ====== */
.section--about .about-grid{
  display:grid; gap:1rem; grid-template-columns: 1.2fr 1fr;
}
.section--about .lede{ font-size: var(--step-1); font-weight:600; }
@media (max-width: 900px){
  .section--about .about-grid{ grid-template-columns: 1fr; }
}

/* ====== Projects (Feature Articles) ====== */
.feature{
  display:grid; gap:1.25rem; grid-template-columns: 1fr; margin-bottom: clamp(2rem, 6vw, 4rem);
}
.feature-media{
  margin:0; border-radius: var(--radius); overflow:hidden; line-height:0;
  box-shadow: var(--shadow);
}
.feature-media img{
  width:100%; aspect-ratio: 16/9; object-fit: contain;
  transition: transform 600ms ease;
}
.feature-body{ max-width: 75ch; }
.feature-title{ font:800 var(--step-2)/1.1 var(--ff-serif); margin:.25rem 0 .5rem; }
.feature-dek{ color:var(--muted); margin:0 0 1rem 0; }

.feature-links{ display:flex; gap:.75rem; flex-wrap:wrap; }
.btn{
  display:inline-block; padding:.65rem 1rem; border-radius:.6rem;
  border:1.5px solid var(--ink); font-weight:700; letter-spacing:.01em;
  transition: transform var(--speed) ease, background var(--speed) ease, color var(--speed) ease;
}
.btn:hover{ transform: translateY(-1px); background:var(--ink); color:#fff; text-decoration:none; }
.btn--ghost{ border-color: var(--accent); color: var(--accent-ink); }
.btn--ghost:hover{ background:var(--accent); color:#fff; }

.feature:hover .feature-media img{ transform: scale(1.015); }

/* ====== Skills ====== */
.skill-list{
  columns: 2 260px; gap: 2rem; padding:0; margin:0; list-style:none;
}
.skill-list li{
  padding:.4rem 0; border-bottom:1px dashed var(--rule);
}

/* ====== Contact ====== */
.contact-form{
  max-width: 640px; padding: 1.25rem; border:1px solid var(--rule); border-radius: var(--radius);
}
.form-row{ display:flex; flex-direction:column; gap:.4rem; margin-bottom:1rem; }
label{ font-weight:600; }
input, textarea{
  border:1px solid var(--rule); border-radius:.5rem; padding:.8rem 1rem; font:inherit; background:#fff;
}
input:focus, textarea:focus{ outline:2px solid var(--accent); outline-offset:2px; }

/* ====== Footer ====== */
.site-footer{
  border-top:1px solid var(--rule); padding-block:2rem; color:var(--muted);
}
.footer-grid{
  display:flex; align-items:center; justify-content:space-between; gap:1rem; flex-wrap:wrap;
}
.social{ list-style:none; display:flex; gap:1rem; padding:0; margin:0; }
.social a{ text-decoration:underline; text-underline-offset: 2px; }

/* ====== Fade-in on scroll (subtle) ====== */
[data-animate]{ opacity:0; transform: translateY(8px); transition: opacity 600ms ease, transform 600ms ease; }
[data-animate].is-visible{ opacity:1; transform:none; }