/* ============================================================
   Personal portfolio — minimal static stylesheet
   Palette: near-black text on off-white, one indigo accent.
   All text/background pairs below meet WCAG AA (4.5:1+).
   ============================================================ */

:root {
  --bg:        #fbfbf9;
  --surface:   #ffffff;
  --text:      #16181d;   /* 16.5:1 on --bg */
  --text-soft: #565c66;   /* 6.4:1  on --bg */
  --border:    #e3e3de;
  --accent:    #2f45c5;   /* 7.9:1  on --bg */
  --accent-dk: #1f2f96;

  --max: 46rem;
  --pad: 1.5rem;

  --radius: 10px;
  --shadow: 0 1px 2px rgba(22, 24, 29, .05), 0 6px 20px rgba(22, 24, 29, .05);

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
          Arial, "Noto Sans", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; }

/* ---------- layout ---------- */

.wrap {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.section { padding-block: 3.5rem; }
.section + .section { border-top: 1px solid var(--border); }

/* ---------- typography ---------- */

h1, h2, h3 { line-height: 1.2; letter-spacing: -0.015em; margin: 0; }

h1 { font-size: clamp(2.25rem, 6vw, 3rem); font-weight: 700; }

h2 {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--text-soft);
  margin-bottom: 1.25rem;
}

h3 { font-size: 1.125rem; font-weight: 650; }

/* Sub-heading inside a section (e.g. Certifications under Skills) */
.subhead {
  font-size: .8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-soft);
  margin: 1.75rem 0 .75rem;
}

p { margin: 0 0 1rem; }
p:last-child { margin-bottom: 0; }

.prose { color: var(--text-soft); max-width: 38rem; }

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--accent-dk); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: 50%; top: 0;
  transform: translate(-50%, -120%);
  background: var(--surface); color: var(--text);
  padding: .6rem 1rem; border: 1px solid var(--border);
  border-radius: 0 0 var(--radius) var(--radius);
  z-index: 20; text-decoration: none;
}
.skip-link:focus { transform: translate(-50%, 0); }

/* ---------- header ---------- */

.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(251, 251, 249, .88);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex; flex-wrap: wrap; gap: .5rem 1.25rem;
  align-items: center; justify-content: space-between;
  padding-block: .85rem;
}

.brand {
  font-weight: 650; color: var(--text); text-decoration: none;
  letter-spacing: -0.01em;
}
.brand:hover { color: var(--accent); }

.nav-list {
  display: flex; flex-wrap: wrap; gap: 1.1rem;
  list-style: none; margin: 0; padding: 0;
  font-size: .9375rem;
}
.nav-list a { color: var(--text-soft); text-decoration: none; }
.nav-list a:hover { color: var(--accent); text-decoration: underline; }

/* ---------- hero ---------- */

.hero { padding-block: 5rem 3.5rem; }

.hero-title {
  font-size: 1.25rem; font-weight: 550;
  color: var(--accent);
  margin-top: .75rem; margin-bottom: .5rem;
}

.hero-summary { color: var(--text-soft); max-width: 34rem; }

.social-list {
  display: flex; flex-wrap: wrap; gap: .5rem .75rem;
  list-style: none; margin: 1.75rem 0 0; padding: 0;
}

.social-link {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .45rem .85rem;
  font-size: .9375rem; font-weight: 500;
  color: var(--text); text-decoration: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: border-color .15s ease, color .15s ease, transform .15s ease;
}
.social-link:hover {
  color: var(--accent); border-color: var(--accent);
  transform: translateY(-1px);
}

.icon { width: 1.05em; height: 1.05em; flex: none; }

/* ---------- projects ---------- */

.project-grid {
  display: grid; gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr));
  list-style: none; margin: 0; padding: 0;
}

.card {
  display: flex; flex-direction: column;
  gap: .75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem;
  transition: border-color .18s ease, box-shadow .18s ease, transform .18s ease;
}
.card:hover {
  border-color: #cfcfc8;
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.card-title { margin: 0; }
.card-desc { color: var(--text-soft); font-size: .9375rem; margin: 0; }

.card-links {
  display: flex; flex-wrap: wrap; gap: 1rem;
  margin: auto 0 0; padding-top: .35rem;
  font-size: .9375rem; font-weight: 500;
}

/* ---------- tags ---------- */

.tags {
  display: flex; flex-wrap: wrap; gap: .4rem;
  list-style: none; margin: 0; padding: 0;
}

.tag {
  font-size: .8125rem;
  color: var(--text-soft);
  background: #f2f2ee;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: .2rem .55rem;
  white-space: nowrap;
}

.tags-lg .tag { font-size: .9375rem; padding: .35rem .75rem; }

/* ---------- buttons ---------- */

.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  background: var(--accent); color: #fff;
  font-weight: 550; font-size: .9375rem;
  padding: .7rem 1.25rem;
  border-radius: 8px; text-decoration: none;
  transition: background .15s ease, transform .15s ease;
}
.btn:hover { background: var(--accent-dk); color: #fff; transform: translateY(-1px); }

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 1rem;
  padding-block: 2rem 2.5rem;
  font-size: .9375rem;
  color: var(--text-soft);
}

.footer-inner {
  display: flex; flex-wrap: wrap; gap: .5rem 1.5rem;
  align-items: center; justify-content: space-between;
}

.footer-name { margin: 0; }

.footer-links {
  display: flex; flex-wrap: wrap; gap: 1.1rem;
  list-style: none; margin: 0; padding: 0;
}
.footer-links a { color: var(--text-soft); text-decoration: none; }
.footer-links a:hover { color: var(--accent); text-decoration: underline; }

/* ---------- scroll reveal (progressive enhancement) ---------- */

.js .reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .5s ease, transform .5s ease;
}
.js .reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }
  .js .reveal { opacity: 1; transform: none; }
}

/* ---------- small screens ---------- */

@media (max-width: 34rem) {
  .hero { padding-block: 3.25rem 2.5rem; }
  .section { padding-block: 2.75rem; }
  .nav-list { gap: .85rem; font-size: .875rem; }
}