/* ---------- Base ---------- */
:root{
  --bg: #ffffff;
  --surface: rgba(255,255,255,.85);
  --text: #0f172a;
  --muted: #475569;
  --border: rgba(15, 23, 42, .10);
  --shadow: 0 10px 30px rgba(15, 23, 42, .08);

  --radius: 16px;
  --max: 960px;

  --link: #0f172a;
  --link-hover: #0b1220;

  --focus: rgba(59, 130, 246, .45);
}

@media (prefers-color-scheme: dark){
  :root{
    --bg: #0b1220;
    --surface: rgba(11,18,32,.75);
    --text: #e5e7eb;
    --muted: #a3aab7;
    --border: rgba(229,231,235,.12);
    --shadow: 0 10px 30px rgba(0,0,0,.35);

    --link: #e5e7eb;
    --link-hover: #ffffff;
    --focus: rgba(96, 165, 250, .45);
  }
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  line-height: 1.65;
  letter-spacing: 0.1px;
}

a{ color: var(--link); text-decoration: none; }
a:hover{ color: var(--link-hover); text-decoration: underline; }
a:focus-visible, button:focus-visible{
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 10px;
}

.container{
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 20px;
}

.content{
  padding: 28px 0 56px;
}

.muted{ color: var(--muted); }

/* ---------- Header ---------- */
.site-header{
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.header-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
}

.brand{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 650;
  letter-spacing: .2px;
}

.brand-mark{
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  font-size: 14px;
}

.brand-text{
  font-size: 15px;
}

/* ---------- Nav ---------- */
.nav{
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-link{
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: 12px;
  border: 1px solid transparent;
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}

.nav-link:hover{
  color: var(--text);
  text-decoration: none;
  background: rgba(15, 23, 42, .05);
  border-color: var(--border);
}

@media (prefers-color-scheme: dark){
  .nav-link:hover{
    background: rgba(229, 231, 235, .06);
  }
}

.nav-cta{
  color: var(--text);
  border-color: var(--border);
  background: rgba(15, 23, 42, .04);
}

@media (prefers-color-scheme: dark){
  .nav-cta{ background: rgba(229, 231, 235, .06); }
}

/* ---------- Typography ---------- */
h1, h2, h3{
  line-height: 1.2;
  letter-spacing: -0.4px;
  margin: 0 0 12px;
}

h1{
  font-size: clamp(28px, 4vw, 42px);
  margin-top: 6px;
}

h2{
  font-size: clamp(20px, 2.5vw, 28px);
  margin-top: 26px;
}

p{ margin: 0 0 14px; }

ul{ margin: 0 0 14px 18px; }
li{ margin: 6px 0; }

hr{
  border: 0;
  border-top: 1px solid var(--border);
  margin: 28px 0;
}

/* ---------- Nice content blocks (optional) ---------- */
.card{
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 18px;
  background: rgba(255,255,255,.6);
}

@media (prefers-color-scheme: dark){
  .card{ background: rgba(11,18,32,.55); }
}

/* ---------- Footer ---------- */
.site-footer{
  border-top: 1px solid var(--border);
  padding: 22px 0 34px;
}

.footer-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.footer-links{ margin: 0; }
.dot{ color: var(--muted); margin: 0 6px; }

/* ---------- Accessibility ---------- */
.skip-link{
  position: absolute;
  left: -9999px;
  top: 10px;
  background: var(--text);
  color: var(--bg);
  padding: 10px 12px;
  border-radius: 12px;
}
.skip-link:focus{ left: 20px; }

/* ---------- Projects cards ---------- */
.cards{
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 16px;
}

@media (min-width: 720px){
  .cards{
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
}

.card-link{
  padding: 0;
}

.card-inner{
  display: block;
  padding: 18px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  background: rgba(255,255,255,.6);
  text-decoration: none;
}

@media (prefers-color-scheme: dark){
  .card-inner{ background: rgba(11,18,32,.55); }
}

.card-inner:hover{
  text-decoration: none;
  transform: translateY(-1px);
}

.card-header{
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.card-title{
  margin: 0;
  font-size: 18px;
  line-height: 1.25;
}

.card-desc{
  margin: 10px 0 0;
  color: var(--muted);
}

.card-cta{
  display: inline-block;
  margin-top: 14px;
  font-size: 14px;
  color: var(--text);
  opacity: .9;
}