:root{
  --accent:#FF6A3D;
  --accent-dark:#E8551F;
  --ink:#16181D;
  --sub:#5B6070;
  --line:#ECECEF;
  --bg:#FFFFFF;
  --bg-soft:#F7F7F9;
  --card:#FFFFFF;
  --radius:10px;
  --max:1180px;
  --c-basics:#2F6FED;
  --c-ml:#0FA36B;
  --c-tools:#B4530C;
  --c-industry:#7A3FE0;
  --c-ethics:#D6336C;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:"Inter","Segoe UI",Helvetica,Arial,sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}

/* header */
header.site{
  border-bottom:1px solid var(--line);
  position:sticky;top:0;background:rgba(255,255,255,.96);
  backdrop-filter:blur(6px);
  z-index:50;
}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;max-width:var(--max);margin:0 auto}
.logo{font-size:26px;font-weight:800;letter-spacing:-.5px}
.logo span{color:var(--accent)}
nav.main-nav{display:flex;gap:26px;flex-wrap:wrap}
nav.main-nav a{font-size:14.5px;font-weight:600;color:var(--ink);padding:6px 0;border-bottom:2px solid transparent}
nav.main-nav a:hover, nav.main-nav a.active{border-bottom:2px solid var(--accent);color:var(--accent-dark)}
.burger{display:none;background:none;border:0;font-size:22px;cursor:pointer}

/* hero / page header */
.page-hero{padding:34px 20px 6px;max-width:var(--max);margin:0 auto}
.page-hero h1{font-size:30px;margin:0 0 6px;letter-spacing:-.5px}
.page-hero p{color:var(--sub);margin:0;font-size:15px}

/* grid of cards */
.grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:26px;
  padding:28px 20px 10px;max-width:var(--max);margin:0 auto;
}
@media(max-width:900px){.grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.grid{grid-template-columns:1fr}}

.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:box-shadow .15s, transform .15s}
.card:hover{box-shadow:0 10px 24px rgba(20,20,30,.08);transform:translateY(-2px)}
.thumb{aspect-ratio:16/9;width:100%;position:relative;overflow:hidden}
.card-body{padding:16px 18px 18px}
.badge{
  display:inline-block;font-size:11px;font-weight:800;letter-spacing:.4px;
  color:#fff;padding:5px 10px;border-radius:4px;margin-bottom:10px;text-transform:uppercase;
}
.card h3{font-size:18px;margin:0 0 8px;line-height:1.32}
.card h3 a:hover{color:var(--accent-dark)}
.card p.excerpt{color:var(--sub);font-size:14px;margin:0 0 12px}
.meta{font-size:12.5px;color:#8B90A0;display:flex;gap:6px;align-items:center}
.meta b{color:var(--ink);font-weight:600}

.badge.basics{background:var(--c-basics)}
.badge.ml{background:var(--c-ml)}
.badge.tools{background:var(--c-tools)}
.badge.industry{background:var(--c-industry)}
.badge.ethics{background:var(--c-ethics)}

/* section titles on homepage */
.section-title{
  max-width:var(--max);margin:38px auto 0;padding:0 20px;
  display:flex;align-items:center;justify-content:space-between;
}
.section-title h2{font-size:21px;margin:0;letter-spacing:-.3px}
.section-title a{font-size:13.5px;font-weight:700;color:var(--accent-dark)}

/* category chip strip */
.chip-row{display:flex;gap:10px;flex-wrap:wrap;max-width:var(--max);margin:26px auto 0;padding:0 20px}
.chip{border:1px solid var(--line);padding:8px 14px;border-radius:999px;font-size:13.5px;font-weight:600;color:var(--ink);background:var(--bg-soft)}
.chip:hover{border-color:var(--accent)}

/* article page */
.article-wrap{max-width:760px;margin:0 auto;padding:34px 20px 60px}
.article-wrap .badge{margin-bottom:14px}
.article-wrap h1{font-size:33px;line-height:1.24;letter-spacing:-.6px;margin:0 0 14px}
.article-meta{display:flex;gap:14px;align-items:center;color:var(--sub);font-size:13.5px;margin-bottom:22px;flex-wrap:wrap}
.article-meta .avatar{width:26px;height:26px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:800}
.hero-thumb{aspect-ratio:16/9;border-radius:var(--radius);overflow:hidden;margin-bottom:26px}
.article-body h2{font-size:22px;margin:32px 0 12px;letter-spacing:-.3px}
.article-body h3{font-size:18px;margin:24px 0 10px}
.article-body p{font-size:16.5px;color:#2A2D36;margin:0 0 16px}
.article-body ul{margin:0 0 16px;padding-left:20px;color:#2A2D36;font-size:16.5px}
.article-body li{margin-bottom:6px}
.pull{border-left:3px solid var(--accent);padding:4px 0 4px 16px;margin:22px 0;color:var(--sub);font-style:italic;font-size:16px}
.share-note{margin-top:36px;padding-top:20px;border-top:1px solid var(--line);color:var(--sub);font-size:13.5px}

.related{max-width:var(--max);margin:10px auto 50px;padding:0 20px}
.related h2{font-size:20px;margin:0 0 16px}

/* static pages */
.static-page{max-width:760px;margin:0 auto;padding:40px 20px 70px}
.static-page h1{font-size:30px;margin:0 0 18px}
.static-page h2{font-size:20px;margin:28px 0 10px}
.static-page p,.static-page li{color:#2A2D36;font-size:16px}
.static-page ul{padding-left:20px}

form.contact-form{display:flex;flex-direction:column;gap:14px;max-width:480px;margin-top:20px}
form.contact-form input, form.contact-form textarea{
  padding:12px 14px;border:1px solid var(--line);border-radius:8px;font-family:inherit;font-size:14.5px;background:var(--bg-soft);
}
form.contact-form button{
  background:var(--accent);color:#fff;border:0;padding:12px 18px;border-radius:8px;font-weight:700;cursor:pointer;font-size:14.5px;width:fit-content;
}
form.contact-form button:hover{background:var(--accent-dark)}

/* footer */
footer.site{border-top:1px solid var(--line);margin-top:50px;background:var(--bg-soft)}
.footer-inner{max-width:var(--max);margin:0 auto;padding:38px 20px;display:grid;grid-template-columns:2fr 1fr 1fr;gap:30px}
.footer-inner h4{font-size:14px;margin:0 0 12px}
.footer-inner p{color:var(--sub);font-size:13.5px;margin:0 0 10px}
.footer-inner ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:8px}
.footer-inner a{font-size:13.5px;color:var(--sub)}
.footer-inner a:hover{color:var(--accent-dark)}
.footer-bottom{border-top:1px solid var(--line);text-align:center;padding:16px 20px;color:#9AA0AC;font-size:12.5px}
@media(max-width:700px){.footer-inner{grid-template-columns:1fr}}

@media(max-width:760px){
  nav.main-nav{display:none}
  .burger{display:block}
  .article-wrap h1{font-size:26px}
}