/* ============================================================
   Võ Minh Triết — personal site shared stylesheet
   Signature: ledger-binder tabs — 3 content pillars = 3 colored
   tab dividers off one navy spine, echoing the finance/ledger
   identity already used on the course landing page.
   ============================================================ */

:root{
  --ink:#142433;
  --ink-soft:#3c5064;
  --paper:#ffffff;
  --paper-alt:#f2f5f4;
  --line:#d8dfdd;

  /* pillar accents */
  --blog:#00c896;        /* mint  — Blog cá nhân */
  --blog-deep:#059269;
  --finance:#0b6e76;     /* teal  — Tài Chính Bệnh Viện */
  --finance-deep:#0a4f56;
  --journey:#c9a227;     /* gold  — Hành Trình Minh Triết */
  --journey-deep:#96791c;

  --radius:14px;
  --serif:'Fraunces', serif;
  --sans:'IBM Plex Sans', sans-serif;
  --mono:'IBM Plex Mono', monospace;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0; background:var(--paper); color:var(--ink);
  font-family:var(--sans); line-height:1.6; -webkit-font-smoothing:antialiased;
}
a{color:inherit; text-decoration:none;}
img,svg{display:block;max-width:100%;}
.wrap{max-width:1080px;margin:0 auto;padding:0 28px;}
section{padding:80px 0;}
@media (max-width:720px){ section{padding:52px 0;} }

h1,h2,h3{font-family:var(--serif); font-weight:600; margin:0; letter-spacing:-0.01em;}
p{margin:0 0 16px;}

.eyebrow{
  font-family:var(--mono); font-size:12.5px; letter-spacing:.14em; text-transform:uppercase;
  font-weight:600; margin:0 0 16px; display:inline-block;
}

/* ---------- ledger tab (signature element) ---------- */
.tab{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--mono); font-size:12px; letter-spacing:.08em; text-transform:uppercase;
  font-weight:600; padding:7px 14px 7px 12px; color:#fff;
  clip-path:polygon(0 0, 100% 0, 92% 100%, 0% 100%);
}
.tab.blog{background:var(--blog-deep);}
.tab.finance{background:var(--finance-deep);}
.tab.journey{background:var(--journey-deep);}
.tab-dot{width:7px;height:7px;border-radius:50%;background:currentColor;flex:none;}

/* ---------- HEADER / NAV ---------- */
.site-header{
  position:sticky; top:0; z-index:50; background:rgba(255,255,255,.94);
  backdrop-filter:blur(6px); border-bottom:1px solid var(--line);
}
.nav-inner{
  max-width:1080px; margin:0 auto; padding:16px 28px;
  display:flex; align-items:center; justify-content:space-between;
}
.brand{display:flex; align-items:center; gap:10px; font-family:var(--serif); font-weight:600; font-size:17px;}
.brand .mark{
  width:32px;height:32px;border-radius:8px;background:var(--ink);
  color:#fff; display:flex; align-items:center; justify-content:center;
  font-family:var(--mono); font-size:12px; font-weight:600; flex:none;
}
.site-nav{display:flex; align-items:center; gap:4px;}
.site-nav a{
  font-size:14.5px; font-weight:500; color:var(--ink-soft); padding:9px 14px; border-radius:8px;
  transition:background .15s ease, color .15s ease;
}
.site-nav a:hover{background:var(--paper-alt); color:var(--ink);}
.site-nav a.active{color:var(--ink); font-weight:600;}
.site-nav a.active.blog{box-shadow:inset 0 -2.5px 0 var(--blog);}
.site-nav a.active.finance{box-shadow:inset 0 -2.5px 0 var(--finance);}
.site-nav a.active.journey{box-shadow:inset 0 -2.5px 0 var(--journey);}
.nav-toggle{display:none; background:none; border:none; cursor:pointer; padding:8px;}
.nav-toggle svg{width:22px;height:22px;}
@media (max-width:720px){
  .nav-toggle{display:block;}
  .site-nav{
    position:fixed; inset:64px 0 0 0; background:var(--paper); flex-direction:column; align-items:stretch;
    padding:12px 20px; gap:2px; transform:translateY(-110%); transition:transform .25s ease; border-top:1px solid var(--line);
  }
  .site-nav.open{transform:translateY(0);}
  .site-nav a{padding:14px 12px; font-size:16px; border-bottom:1px solid var(--line); border-radius:0;}
}

/* ---------- BUTTONS ---------- */
.btn{
  font-family:var(--sans); font-weight:600; font-size:14.5px; border:none; cursor:pointer;
  border-radius:9px; padding:12px 20px; display:inline-flex; align-items:center; gap:8px;
  transition:transform .15s ease, box-shadow .15s ease;
}
.btn:focus-visible{outline:3px solid var(--blog); outline-offset:2px;}
.btn-ink{background:var(--ink); color:#fff;}
.btn-ink:hover{transform:translateY(-1px); box-shadow:0 6px 16px rgba(20,36,51,.22);}
.btn-ghost{background:transparent; color:var(--ink); border:1.5px solid var(--line);}
.btn-ghost:hover{border-color:var(--ink);}
.btn-finance{background:var(--finance);color:#fff;}
.btn-finance:hover{transform:translateY(-1px); box-shadow:0 6px 16px rgba(11,110,118,.28);}

/* ---------- HERO (hub homepage) ---------- */
.home-hero{padding:76px 0 40px;}
.home-hero h1{font-size:clamp(32px,5vw,50px); line-height:1.1; max-width:760px;}
.home-hero .lede{font-size:18px; color:var(--ink-soft); max-width:600px; margin-top:18px;}
.tab-strip{display:flex; gap:10px; flex-wrap:wrap; margin-top:28px;}

/* ---------- PILLAR CARDS ---------- */
.pillars{display:grid; grid-template-columns:repeat(3,1fr); gap:22px; margin-top:20px;}
@media (max-width:860px){ .pillars{grid-template-columns:1fr;} }
.pillar-card{
  border:1px solid var(--line); border-radius:var(--radius); padding:28px; background:var(--paper);
  border-top:4px solid var(--c); transition:transform .18s ease, box-shadow .18s ease;
}
.pillar-card:hover{transform:translateY(-3px); box-shadow:0 18px 34px -18px rgba(20,36,51,.28);}
.pillar-card.blog{--c:var(--blog);}
.pillar-card.finance{--c:var(--finance);}
.pillar-card.journey{--c:var(--journey);}
.pillar-card h3{font-size:19px; margin:14px 0 8px;}
.pillar-card p{font-size:14.5px; color:var(--ink-soft); margin-bottom:16px;}
.pillar-card .go{font-family:var(--mono); font-size:13px; font-weight:600;}
.pillar-card.blog .go{color:var(--blog-deep);}
.pillar-card.finance .go{color:var(--finance-deep);}
.pillar-card.journey .go{color:var(--journey-deep);}

/* ---------- POST / ARTICLE CARDS (feed + section listings) ---------- */
.post-grid{display:grid; gap:20px; margin-top:28px;}
.post-card{
  display:grid; grid-template-columns:auto 1fr; gap:18px; align-items:flex-start;
  padding:22px 0; border-bottom:1px solid var(--line);
}
.post-card:first-child{padding-top:0;}
.post-card .pc-date{
  font-family:var(--mono); font-size:12.5px; color:var(--ink-soft); white-space:nowrap; padding-top:4px; width:78px;
}
.post-card h3{font-size:18px; margin-bottom:6px;}
.post-card h3 a:hover{text-decoration:underline;}
.post-card p{font-size:14.5px; color:var(--ink-soft); margin-bottom:8px;}
.post-card .pc-more{font-family:var(--mono); font-size:12.5px; font-weight:600;}
@media (max-width:560px){
  .post-card{grid-template-columns:1fr;}
  .post-card .pc-date{width:auto;}
}

/* ---------- SECTION HERO (blog/finance/journey index pages) ---------- */
.section-hero{padding:56px 0 20px; border-bottom:1px solid var(--line);}
.section-hero h1{font-size:clamp(28px,4vw,40px); margin-top:14px;}
.section-hero .lede{font-size:16.5px; color:var(--ink-soft); max-width:600px; margin-top:14px;}
.breadcrumb{font-family:var(--mono); font-size:12.5px; color:var(--ink-soft); margin-bottom:18px; display:inline-block;}
.breadcrumb:hover{color:var(--ink);}

/* ---------- ARTICLE / POST DETAIL ---------- */
.article-head{padding:52px 0 28px;}
.article-head h1{font-size:clamp(28px,4.4vw,42px); margin:16px 0 14px; line-height:1.15;}
.article-meta{font-family:var(--mono); font-size:13px; color:var(--ink-soft);}
.article-body{max-width:680px; font-size:17px; color:#23343f;}
.article-body p{margin-bottom:20px;}
.article-body h2{font-size:22px; margin:34px 0 14px;}
.article-body blockquote{
  margin:28px 0; padding:4px 0 4px 20px; border-left:3px solid var(--line);
  font-style:italic; color:var(--ink-soft);
}
.article-note{
  background:var(--paper-alt); border:1px solid var(--line); border-radius:12px; padding:18px 20px;
  font-size:14.5px; color:var(--ink-soft); margin-top:40px;
}

/* ---------- FEATURED COURSE CARD (tai-chinh-benh-vien) ---------- */
.course-feature{
  background:var(--ink); color:#fff; border-radius:20px; padding:40px; margin-top:44px;
  display:grid; grid-template-columns:1fr auto; gap:24px; align-items:center;
}
@media (max-width:640px){ .course-feature{grid-template-columns:1fr;} }
.course-feature h3{color:#fff; font-size:22px; margin:10px 0 8px;}
.course-feature p{color:#c9d6d9; font-size:14.5px; margin-bottom:0;}
.course-feature .price{font-family:var(--mono); color:var(--blog); font-weight:700;}

/* ---------- FOOTER ---------- */
.site-footer{border-top:1px solid var(--line); padding:36px 0; margin-top:20px;}
.footer-row{display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:12px;}
.footer-row .fbrand{font-family:var(--serif); font-weight:600; font-size:15px;}
.footer-row .ftag{font-size:13px; color:var(--ink-soft);}
.footer-links{display:flex; gap:18px; font-size:13.5px; color:var(--ink-soft);}
.footer-links a:hover{color:var(--ink);}

@media (prefers-reduced-motion: reduce){
  *{transition:none !important; animation:none !important; scroll-behavior:auto !important;}
}