/* ============================================================
   psk-content.css - THAN BAI VIET (.psk-post)
   ------------------------------------------------------------
   Trich nguyen van tu 16 file bai-*.html. Moi rule o day da duoc
   kiem chung la GIONG HET NHAU o ca 16 bai (0 xung dot gia tri)
   -> go <style> khoi bai viet thi hien thi khong doi mot pixel.

   KHONG dat o day: .step .big .steps .prio .move .ev .calc .srcbar
   .ph .study .formula .crit -- cac class nay co gia tri KHAC NHAU
   tung bai, phai giu inline trong chinh bai do.

   Bien mau: xem psk-tokens.css
   ============================================================ */

/* ---------- NEN & CHU ---------- */
.psk-post {
  font-family:'Nunito Sans',-apple-system,Segoe UI,Roboto,sans-serif;
  color:var(--ink);
  line-height:1.75;
  font-size:17.5px;
}
.psk-post * {
  box-sizing:border-box;
}
.psk-post a {
  color:var(--teal-d);
}
.psk-post p {
  margin:0 0 18px;
}
.psk-post h2 {
  font-size:27px;
  font-weight:800;
  color:var(--teal-d);
  margin:44px 0 14px;
  line-height:1.25;
}
.psk-post h3 {
  font-size:20px;
  font-weight:800;
  margin:28px 0 10px;
}
.psk-post .w {
  max-width:760px;
  margin:0 auto;
}
.psk-post .lead {
  font-size:20px;
  color:var(--muted);
  margin-bottom:26px;
}

/* ---------- CAU NHAN (pull quote) ---------- */
.psk-post .pull {
  border-left:5px solid var(--teal-l);
  background:#eef8fa;
  padding:20px 24px;
  border-radius:0 14px 14px 0;
  font-size:19px;
  font-weight:700;
  color:var(--teal-d);
  margin:26px 0;
}

/* ---------- NUT ---------- */
.psk-post .btn {
  display:inline-block;
  background:var(--accent);
  color:#3a2a10;
  font-weight:800;
  padding:14px 28px;
  border-radius:10px;
  font-size:16.5px;
  text-decoration:none;
  box-shadow:0 6px 18px rgba(0,0,0,.12);
}
.psk-post .btn:hover {
  color:#3a2a10;
}

/* ---------- BANG SO LIEU ---------- */
.psk-post table {
  width:100%;
  border-collapse:collapse;
  margin:22px 0;
  font-size:16px;
}
.psk-post th {
  background:#eef8fa;
  color:var(--teal-d);
  text-align:left;
  padding:12px 14px;
  font-weight:800;
  font-size:15px;
}
.psk-post td {
  padding:11px 14px;
  border-bottom:1px solid #eef2f3;
}
.psk-post td.num {
  text-align:right;
  font-weight:700;
  color:var(--teal-d);
  white-space:nowrap;
}
.psk-post tr:last-child td {
  border-bottom:none;
}

/* ---------- HOP CANH BAO (.warn) ---------- */
.psk-post .warn {
  background:#fff7ec;
  border:1px solid #f0d9b5;
  border-left:5px solid var(--accent);
  border-radius:0 14px 14px 0;
  padding:22px 26px;
  margin:26px 0;
}
.psk-post .warn h3 {
  margin:0 0 8px;
  color:#8a5a12;
  font-size:18px;
}
.psk-post .warn p {
  font-size:16px;
  margin:0 0 10px;
}
.psk-post .warn p:last-child {
  margin:0;
}

/* ---------- HOP KIEN THUC NEN DAM (.field) ---------- */
.psk-post .field {
  background:#0b5966;
  color:#eafcff;
  border-radius:16px;
  padding:26px 30px;
  margin:26px 0;
}
.psk-post .field h3 {
  color:#fff;
  margin:0 0 10px;
  font-size:19px;
}
.psk-post .field p {
  color:#d7f2f7;
  margin:0 0 12px;
  font-size:16.5px;
}
.psk-post .field p:last-child {
  margin:0;
}
.psk-post .field b {
  color:#fff;
}

/* ---------- CHECKLIST (.check) ---------- */
.psk-post .check {
  background:#eef8fa;
  border-radius:16px;
  padding:24px 28px;
  margin:26px 0;
}
.psk-post .check h3 {
  margin:0 0 12px;
  color:var(--teal-d);
  font-size:19px;
}
.psk-post .check ul {
  list-style:none;
  padding:0;
  margin:0;
}
.psk-post .check li {
  position:relative;
  padding:10px 0 10px 32px;
  font-size:16.5px;
  border-bottom:1px solid #dbecef;
}
.psk-post .check li:before {
  content:"□";
  position:absolute;
  left:0;
  top:9px;
  font-size:20px;
  color:var(--teal-l);
}
.psk-post .check li:last-child {
  border-bottom:none;
}

/* ---------- HAI COT NEN/KHONG NEN (.duo .can .cant) ---------- */
.psk-post .duo {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:14px;
  margin:24px 0;
}
.psk-post .can,.psk-post .cant {
  border-radius:14px;
  padding:22px 24px;
}
.psk-post .can {
  background:#eef8fa;
  border:1px solid #d6ebef;
}
.psk-post .cant {
  background:#fdecec;
  border:1px solid #f3c6c6;
}
.psk-post .can h3 {
  margin:0 0 10px;
  color:var(--teal-d);
  font-size:18px;
}
.psk-post .cant h3 {
  margin:0 0 10px;
  color:#a5281c;
  font-size:18px;
}
.psk-post .can ul,.psk-post .cant ul {
  margin:0;
  padding-left:18px;
  font-size:16px;
}
.psk-post .can li,.psk-post .cant li {
  margin-bottom:7px;
}

/* ---------- CONG BO TIEP THI LIEN KET (.disc) ---------- */
.psk-post .disc {
  background:#f7fafb;
  border:1px dashed #c3d8dd;
  border-radius:12px;
  padding:16px 20px;
  margin:0 0 26px;
  font-size:15.5px;
  color:var(--muted);
}

/* ---------- NGUON THAM KHAO (.src) ---------- */
.psk-post .src {
  background:#f7fafb;
  border-radius:14px;
  padding:22px 26px;
  margin:32px 0;
  font-size:15px;
  color:var(--muted);
}
.psk-post .src h3 {
  font-size:14px;
  text-transform:uppercase;
  letter-spacing:1px;
  color:var(--teal-d);
  margin:0 0 10px;
}
.psk-post .src ul {
  margin:0;
  padding-left:18px;
}
.psk-post .src li {
  margin-bottom:7px;
  line-height:1.55;
}

/* ---------- CTA CUOI BAI (.cta) ---------- */
.psk-post .cta {
  background:linear-gradient(160deg,#0e6d7d,#29a7bd);
  color:#fff;
  border-radius:18px;
  padding:38px 32px;
  text-align:center;
  margin:40px 0 18px;
}
.psk-post .cta h2 {
  color:#fff;
  margin:0 0 12px;
  font-size:24px;
}
.psk-post .cta p {
  color:#eafbff;
  max-width:520px;
  margin:0 auto 20px;
}


/* ---------- MOBILE (<= 720px) ---------- */
@media (max-width: 720px) {
  .psk-post h2 {
    font-size:23px;
  }
  .psk-post table {
    font-size:15px;
  }
  .psk-post th,
  .psk-post td {
    padding:9px 8px;
  }
  .psk-post .duo {
    grid-template-columns:1fr;
  }
}