:root{
  --bg: #ffffff;
  --fg: #0f172a;
  --muted:#64748b;
  --card:#ffffff;
  --border:#e5e7eb;
  --link:#0b63ce;
  --shadow: 0 10px 30px rgba(0,0,0,.08);
  --maxw: 780px;
  --serif: ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;
  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
}

html[data-theme="dark"]{
  --bg: #0b1220;
  --fg: #e5e7eb;
  --muted:#94a3b8;
  --card:#0f172a;
  --border:#1f2937;
  --link:#60a5fa;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
}

*{box-sizing:border-box;}

html, body{
  height: 100%;
  background: var(--bg);
  color: var(--fg);
}

body{
  margin: 10px;
    font-family: var(--sans), serif;
}

a{color:var(--link); text-decoration:none;}
a:hover{text-decoration:underline;}

header{
  position:sticky; top:0; z-index:10;
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(10px);
  border-bottom:1px solid var(--border);
}

html[data-theme="dark"] header{
  background: rgba(11,18,32,.85);
}

.header-inner{
  max-width: var(--maxw);
  margin:0 auto;
  padding: 12px 14px;
  display:flex; gap:12px; align-items:center; justify-content:space-between;
}

.brand{
  display:flex; flex-direction:column; gap:2px;
  min-width: 140px;
}

.brand .title{
  font-weight:800;
  letter-spacing:0;
  color: var(--fg);
  font-size: 20px;
}

.brand .sub{font-size:12px; color:var(--muted);}

/* ===========================
   Header Action Buttons
=========================== */

.actions {
  display: flex;
  gap: 8px;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap; /* allows wrapping on small screens */
}

.actions .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap; /* prevents button text from splitting */
}

@media (max-width: 600px) {
  .actions {
    justify-content: center;
    gap: 6px;
  }

  .actions .btn {
    padding: 8px 10px;
    font-size: 14px;
  }
}

.btn{
  border:1px solid var(--border);
  background: var(--card);
  color: var(--fg);
  padding: 8px 10px;
  border-radius: 10px;
  cursor:pointer;
  box-shadow:none;
}

.btn:hover{box-shadow: var(--shadow);}

.btn.primary{
  background: var(--fg);
  color: var(--bg);
  border-color: color-mix(in oklab, var(--fg) 90%, var(--border));
}

/* layout helpers used by landing/about */
main{
  max-width: var(--maxw);
  margin: 0 auto;
  width: 100%;
  padding: 18px 14px 48px;
}

.card{
  border:1px solid var(--border);
  background: var(--card);
  border-radius: 14px;
  box-shadow:none;
}

.card.pad{ padding: 18px; }

.h1{
  font-size: 28px;
  margin: 0 0 10px 0;
  letter-spacing:.2px;
}

.p{
  margin: 12px 0;
  font-size: 16px;
  line-height: 1.65;
  color: var(--fg);
}

.muted{ color: var(--muted); }
.divider{ margin: 22px 0; height:1px; background: var(--border); }

.kicker{
    font-family: var(--serif), serif;
  font-size: 20px;
  margin: 14px 0 10px;
  padding: 16px;
  border-left:4px solid var(--fg);
  background: color-mix(in oklab, var(--bg) 70%, transparent);
}

.grid{
  display:grid;
  gap: 12px;
}

@media (min-width: 820px){
  .grid.cols2{ grid-template-columns: 1fr 1fr; }
}

.pill {
  display: inline-block;
  padding: 8px 22px;
  margin: 0 8px;
  border-radius: 999px;
  font-size: 1.08em;
  font-weight: 600;
  background: linear-gradient(90deg, var(--bg) 0%, var(--border) 100%);
  color: var(--fg);
  text-decoration: none;
  transition: background 0.2s, color 0.2s;
}
.pill:hover, .pill:focus {
  background: linear-gradient(90deg, var(--accent) 0%, var(--border) 100%);
  color: var(--fg);
  text-decoration: none;
}

.hamburger {
  font-size: 1.6em;
  background: none;
  border: none;
  color: var(--fg);
  cursor: pointer;
  margin-left: 12px;
}

.nav-menu {
  display: none;
  position: absolute;
  top: 56px;
  right: 16px;
  background: var(--bg);
  border-radius: 12px;
  box-shadow: 0 2px 16px rgba(0,0,0,0.13);
  padding: 12px 0;
  z-index: 100;
}
.nav-menu.open {
  display: block;
}
.nav-menu .pill {
  display: block;
  padding: 12px 24px;
  text-align: left;
  border-radius: 999px;
  margin: 6px 12px;
  font-size: 1.08em;
  font-weight: 600;
  background: linear-gradient(90deg, var(--bg) 0%, var(--border) 100%);
  color: var(--fg);
  text-decoration: none;
  transition: background 0.2s, color 0.2s;
}
.nav-menu .pill:hover, .nav-menu .pill:focus {
  background: linear-gradient(90deg, var(--accent) 0%, var(--border) 100%);
  color: var(--fg);
}
@media (min-width: 700px) {
  .nav-menu {
    display: flex !important;
    position: static;
    background: none;
    box-shadow: none;
    border-radius: 0;
    padding: 0;
  }
  .nav-menu .pill {
    display: inline-block;
    padding: 8px 22px;
    margin: 0 8px;
    border-radius: 999px;
    font-size: 1.08em;
  }
  .hamburger {
    display: none;
  }
}