/* === Reset === */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}

/* === Tokens — Light (default) === */
:root{
  --bg:#FAFAFA;
  --fg:#09090B;
  --sub:#52525B;
  --dim:#A1A1AA;
  --border:#E4E4E7;
  --card:#FFFFFF;
  --card-h:#F4F4F5;
  --accent:#2563EB;
  --accent-t:rgba(37,99,235,.08);
  --radius:8px;
}

/* === Tokens — Dark === */
[data-theme="dark"]{
  --bg:#09090B;
  --fg:#FAFAFA;
  --sub:#A1A1AA;
  --dim:#52525B;
  --border:#27272A;
  --card:#18181B;
  --card-h:#1F1F23;
  --accent:#60A5FA;
  --accent-t:rgba(96,165,250,.1);
}

/* === Base === */
html{scroll-behavior:smooth}
body{
  font-family:'Archivo','Space Grotesk',system-ui,sans-serif;
  background:var(--bg);
  color:var(--fg);
  -webkit-font-smoothing:antialiased;
  line-height:1.6;
  transition:background .2s,color .2s;
}

a{color:inherit;text-decoration:none}

.wrapper{
  max-width:680px;
  margin:0 auto;
  padding:0 20px;
}

/* === Nav === */
nav{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:16px 0;
  position:sticky;
  top:0;
  z-index:10;
  background:var(--bg);
  transition:background .2s;
}

.logo{
  font-weight:700;
  font-size:17px;
  letter-spacing:-.02em;
}

.nav-r{
  display:flex;
  align-items:center;
  gap:16px;
}

.nav-r a{
  font-size:14px;
  color:var(--sub);
  transition:color .15s;
}
.nav-r a:hover{color:var(--fg)}

.theme-btn{
  display:flex;
  align-items:center;
  justify-content:center;
  width:32px;
  height:32px;
  border:1px solid var(--border);
  border-radius:6px;
  background:none;
  color:var(--sub);
  cursor:pointer;
  transition:border-color .15s,color .15s;
}
.theme-btn:hover{border-color:var(--accent);color:var(--fg)}

.ic-sun{display:none}
[data-theme="dark"] .ic-sun{display:block}
[data-theme="dark"] .ic-moon{display:none}

/* === Hero === */
.hero{
  padding:48px 0 40px;
}

.label{
  display:inline-block;
  font-size:12px;
  font-weight:600;
  letter-spacing:.06em;
  text-transform:uppercase;
  color:var(--accent);
  margin-bottom:16px;
}

h1{
  font-size:40px;
  font-weight:700;
  letter-spacing:-.03em;
  line-height:1.1;
  margin-bottom:16px;
}

.hero p{
  font-size:17px;
  color:var(--sub);
  line-height:1.6;
  max-width:480px;
  margin-bottom:24px;
}

.btns{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
}

.btn-fill{
  display:inline-block;
  padding:10px 20px;
  font-size:14px;
  font-weight:600;
  color:var(--bg);
  background:var(--fg);
  border-radius:var(--radius);
  transition:opacity .15s;
  cursor:pointer;
}
.btn-fill:hover{opacity:.85}

.btn-line{
  display:inline-block;
  padding:10px 20px;
  font-size:14px;
  font-weight:500;
  border:1px solid var(--border);
  border-radius:var(--radius);
  transition:border-color .15s;
  cursor:pointer;
}
.btn-line:hover{border-color:var(--dim)}

/* === Hr === */
hr{
  border:none;
  border-top:1px solid var(--border);
  transition:border-color .2s;
}

/* === Sections === */
section{padding:40px 0}

h2{
  font-size:22px;
  font-weight:700;
  letter-spacing:-.02em;
  margin-bottom:20px;
}

/* === Cards === */
.cards{display:flex;flex-direction:column;gap:10px}

.card{
  display:block;
  padding:20px;
  border:1px solid var(--border);
  border-radius:var(--radius);
  background:var(--card);
  transition:border-color .15s,background .15s;
  cursor:pointer;
}
.card:hover{
  border-color:var(--dim);
  background:var(--card-h);
}

.card.main{
  border-color:var(--accent);
  background:var(--accent-t);
}
.card.main:hover{
  border-color:var(--accent);
}

.card-label{
  display:inline-block;
  font-size:11px;
  font-weight:600;
  letter-spacing:.04em;
  text-transform:uppercase;
  color:var(--accent);
  margin-bottom:6px;
}

.card h3{
  font-size:17px;
  font-weight:600;
  margin-bottom:4px;
}

.card p{
  font-size:14px;
  color:var(--sub);
  line-height:1.5;
}

.card-meta{
  display:block;
  font-size:12px;
  color:var(--dim);
  margin-top:8px;
}

.card-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:10px;
}

/* === About === */
.about{
  display:flex;
  gap:32px;
  align-items:flex-start;
}

.about > div:first-child{flex:1}

.about p{
  font-size:15px;
  color:var(--sub);
  line-height:1.7;
  margin-bottom:8px;
}
.about strong{color:var(--fg)}
.about a{text-decoration:underline;text-underline-offset:2px}
.about a:hover{color:var(--accent)}

.nums{
  display:flex;
  flex-direction:column;
  gap:12px;
  text-align:right;
  flex-shrink:0;
}
.nums div{
  font-size:14px;
  color:var(--sub);
}
.nums strong{
  display:block;
  font-size:28px;
  font-weight:700;
  line-height:1.1;
  color:var(--fg);
}

/* === Contact === */
.sub{
  font-size:14px;
  color:var(--sub);
  margin-bottom:14px;
}

.links{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
}

.links a{
  font-size:13px;
  padding:7px 14px;
  border:1px solid var(--border);
  border-radius:6px;
  transition:border-color .15s;
  cursor:pointer;
}
.links a:hover{border-color:var(--accent)}

/* === Footer === */
footer{
  border-top:1px solid var(--border);
  padding:24px 0;
  text-align:center;
  font-size:12px;
  color:var(--dim);
}

/* === Mobile-first responsive === */
@media(max-width:640px){
  .wrapper{padding:0 16px}
  .nav-r a{display:none}
  .nav-r{gap:0}
  h1{font-size:28px}
  .hero{padding:32px 0 28px}
  .hero p{font-size:15px}
  section{padding:28px 0}
  .card-grid{grid-template-columns:1fr}
  .about{flex-direction:column;gap:20px}
  .nums{flex-direction:row;gap:20px;text-align:left}
  .nums strong{font-size:22px}
}

@media(min-width:641px) and (max-width:1024px){
  h1{font-size:36px}
}