:root{
  --bg:#0f1115;
  --panel:#171a21;
  --text:#f4f5f7;
  --muted:#a8b0bd;
  --line:#2a303a;
  --content:42rem;
}

*{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
  scroll-behavior:smooth;
}

body{
  margin:0;
  min-width:320px;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans Thai","Helvetica Neue",Arial,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.65;
  font-size:16px;
  overflow-wrap:anywhere;
}

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

a{
  color:#fff;
  text-underline-offset:3px;
}

header{
  border-bottom:1px solid var(--line);
  background:rgba(15,17,21,.96);
}

.wrap{
  width:100%;
  max-width:var(--content);
  margin:0 auto;
  padding-left:max(18px, env(safe-area-inset-left));
  padding-right:max(18px, env(safe-area-inset-right));
}

.nav{
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:12px;
  padding-top:16px;
  padding-bottom:14px;
}

.brand{
  font-size:1.15rem;
  font-weight:800;
  letter-spacing:.2px;
  text-decoration:none;
}

.navlinks{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  width:100%;
}

.navlinks a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:8px 12px;
  margin:0;
  border:1px solid var(--line);
  border-radius:12px;
  color:#d4d8df;
  text-decoration:none;
}

main{
  width:100%;
  max-width:var(--content);
  margin:0 auto;
  padding:
    34px
    max(18px, env(safe-area-inset-right))
    calc(64px + env(safe-area-inset-bottom))
    max(18px, env(safe-area-inset-left));
}

h1{
  margin:8px 0 18px;
  font-size:clamp(2rem,10vw,3.25rem);
  line-height:1.08;
  letter-spacing:-.025em;
}

h2{
  margin:0 0 10px;
  font-size:1.25rem;
  line-height:1.3;
}

p,li{
  color:#d8dde5;
}

p{
  margin:0 0 16px;
}

ul{
  padding-left:1.25rem;
}

li+li{
  margin-top:8px;
}

.lead{
  margin-bottom:28px;
  font-size:1.08rem;
  line-height:1.72;
  color:#e8ebef;
}

.card{
  margin:14px 0;
  padding:20px 18px;
  border:1px solid var(--line);
  background:var(--panel);
  border-radius:16px;
}

.grid{
  display:grid;
  grid-template-columns:1fr;
  gap:12px;
}

.muted{
  color:var(--muted);
  font-size:.9rem;
  letter-spacing:.02em;
}

footer{
  border-top:1px solid var(--line);
  color:var(--muted);
}

footer .wrap{
  padding-top:24px;
  padding-bottom:calc(28px + env(safe-area-inset-bottom));
  font-size:.92rem;
}

button,
input,
select,
textarea{
  font:inherit;
}

/* Larger phones / small tablets */
@media (min-width:480px){
  .wrap,
  main{
    padding-left:24px;
    padding-right:24px;
  }

  .card{
    padding:22px;
  }
}

/* Tablet and desktop enhancement */
@media (min-width:760px){
  :root{ --content:64rem; }

  .nav{
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
    padding-top:18px;
    padding-bottom:18px;
  }

  .navlinks{
    width:auto;
  }

  .navlinks a{
    min-height:40px;
    border:0;
    padding:6px 8px;
  }

  main{
    padding-top:56px;
    padding-bottom:80px;
  }

  h1{
    font-size:clamp(3rem,6vw,4.5rem);
  }

  .lead{
    font-size:1.18rem;
    max-width:48rem;
  }

  .grid{
    grid-template-columns:repeat(3,1fr);
    gap:16px;
  }

  .card{
    margin:20px 0;
  }
}