/* ============================================================
   HỒI QUY TIỀN KIẾP — Stylesheet dùng chung
   Tông màu: Huyền bí Tím/Indigo + điểm vàng kim
   ============================================================ */

:root{
  --indigo-900:#140d2e;
  --indigo-850:#1a1338;
  --indigo-800:#241a4d;
  --indigo-700:#2f2168;
  --violet:#6d54c7;
  --violet-light:#9d86f0;
  --gold:#e6c068;
  --gold-soft:#f0d99a;
  --text:#ece9fb;
  --muted:#a99fce;
  --card-bg:rgba(36,26,77,.55);
  --card-border:#3d2f73;
  --maxw:1140px;
  --radius:18px;
  --shadow:0 14px 50px rgba(0,0,0,.4);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  color:var(--text);
  line-height:1.7;
  background:var(--indigo-900);
  background-image:
    radial-gradient(900px 500px at 15% -5%, rgba(109,84,199,.35), transparent 60%),
    radial-gradient(1000px 600px at 100% 0%, rgba(45,28,110,.5), transparent 55%),
    linear-gradient(180deg, var(--indigo-850), var(--indigo-900) 60%, #0e0920);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--violet-light);text-decoration:none;transition:color .2s;}
a:hover{color:var(--gold-soft);}
img{max-width:100%;display:block;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 22px;}
.section{padding:72px 0;}
.section-tight{padding:48px 0;}

/* ---------- Headings ---------- */
h1,h2,h3{line-height:1.25;font-weight:700;}
.eyebrow{
  display:inline-block;letter-spacing:.22em;text-transform:uppercase;
  font-size:12px;font-weight:700;color:var(--gold);margin-bottom:14px;
}
.section-title{
  font-size:clamp(26px,4vw,38px);margin:0 0 14px;
  background:linear-gradient(90deg,var(--gold-soft),var(--violet-light));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.section-sub{color:var(--muted);font-size:16px;max-width:640px;margin:0 auto 8px;}
.text-center{text-align:center;}

/* ---------- Header / Nav ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(20,13,46,.72);
  backdrop-filter:blur(12px);
  border-bottom:1px solid rgba(61,47,115,.6);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px;}
.brand{display:flex;align-items:center;gap:12px;font-weight:700;font-size:18px;color:var(--text);}
.brand:hover{color:var(--text);}
.brand .logo{width:42px;height:42px;flex:0 0 42px;}
.brand .brand-text small{display:block;font-size:11px;font-weight:400;color:var(--muted);letter-spacing:.08em;}
.nav-links{display:flex;align-items:center;gap:26px;list-style:none;margin:0;padding:0;}
.nav-links a{color:var(--muted);font-size:15px;font-weight:500;}
.nav-links a:hover,.nav-links a.active{color:var(--gold-soft);}
.nav-cta{
  background:linear-gradient(90deg,var(--gold),#d6a94a);color:#2a1d05 !important;
  padding:10px 20px;border-radius:30px;font-weight:700;font-size:14px;
}
.nav-cta:hover{filter:brightness(1.08);color:#2a1d05 !important;}
.nav-toggle{display:none;background:none;border:none;color:var(--text);font-size:26px;cursor:pointer;}

@media(max-width:860px){
  .nav-toggle{display:block;}
  .nav-links{
    position:absolute;top:72px;left:0;right:0;flex-direction:column;gap:0;
    background:rgba(20,13,46,.97);border-bottom:1px solid var(--card-border);
    max-height:0;overflow:hidden;transition:max-height .3s ease;
  }
  .nav-links.open{max-height:420px;}
  .nav-links li{width:100%;border-top:1px solid rgba(61,47,115,.4);}
  .nav-links a{display:block;padding:16px 22px;}
  .nav-links .nav-cta{margin:14px 22px;text-align:center;}
}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;padding:96px 0 86px;text-align:center;}
.hero::before{
  content:"";position:absolute;inset:0;z-index:0;
  background:
    linear-gradient(180deg, rgba(20,13,46,.62), rgba(20,13,46,.86)),
    url("../img/hero.png");
  background-size:cover;background-position:center 35%;pointer-events:none;
}
.hero .container{position:relative;z-index:1;}
.hero h1{
  font-size:clamp(32px,6vw,56px);margin:18px 0 18px;
  background:linear-gradient(90deg,#fff,var(--gold-soft) 60%,var(--violet-light));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero p.lead{font-size:clamp(16px,2.2vw,20px);color:var(--muted);max-width:680px;margin:0 auto 32px;}
.hero-emblem{font-size:54px;filter:drop-shadow(0 0 18px rgba(230,192,104,.55));}

/* ---------- Buttons ---------- */
.btn{
  display:inline-block;cursor:pointer;border:none;font-family:inherit;font-weight:700;
  border-radius:30px;padding:14px 30px;font-size:15px;transition:transform .12s,filter .2s;
}
.btn:active{transform:translateY(1px);}
.btn-gold{background:linear-gradient(90deg,var(--gold),#d6a94a);color:#2a1d05;box-shadow:0 8px 28px rgba(230,192,104,.32);}
.btn-gold:hover{filter:brightness(1.08);color:#2a1d05;}
.btn-ghost{background:rgba(157,134,240,.12);color:var(--violet-light);border:1px solid var(--card-border);}
.btn-ghost:hover{filter:brightness(1.25);color:var(--violet-light);}
.btn-row{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;}

/* ---------- Cards / grids ---------- */
.grid{display:grid;gap:24px;}
.grid-3{grid-template-columns:repeat(3,1fr);}
.grid-2{grid-template-columns:repeat(2,1fr);}
@media(max-width:900px){.grid-3{grid-template-columns:1fr;}.grid-2{grid-template-columns:1fr;}}
.card{
  background:var(--card-bg);border:1px solid var(--card-border);
  border-radius:var(--radius);padding:28px 26px;box-shadow:var(--shadow);
  backdrop-filter:blur(6px);transition:transform .2s,border-color .2s;
}
.card:hover{transform:translateY(-4px);border-color:var(--violet-light);}
.card .icon{font-size:34px;margin-bottom:14px;display:block;}
.card h3{margin:0 0 10px;font-size:20px;color:var(--gold-soft);}
.card p{margin:0;color:var(--muted);font-size:15px;}

/* ---------- Article list ---------- */
.article-card{display:flex;flex-direction:column;height:100%;}
.article-card .tag{
  align-self:flex-start;font-size:12px;font-weight:700;letter-spacing:.06em;
  color:var(--violet-light);background:rgba(157,134,240,.14);
  border:1px solid var(--card-border);padding:4px 12px;border-radius:20px;margin-bottom:14px;
}
.article-card h3{font-size:19px;}
.article-card .more{margin-top:auto;padding-top:16px;font-weight:700;color:var(--gold-soft);}

/* ---------- Article (reading) page ---------- */
.article{max-width:760px;margin:0 auto;}
.article .meta{color:var(--muted);font-size:14px;margin-bottom:8px;}
.article h1{font-size:clamp(28px,4.5vw,40px);margin:0 0 22px;color:var(--gold-soft);line-height:1.25;}
.article h2{font-size:24px;margin:40px 0 14px;color:var(--violet-light);}
.article p{margin:0 0 20px;font-size:17px;color:#ddd8f5;}
.article blockquote{
  margin:26px 0;padding:14px 22px;border-left:3px solid var(--gold);
  background:rgba(157,134,240,.08);border-radius:0 10px 10px 0;color:var(--gold-soft);font-style:italic;
}

/* ---------- Video embed (Facebook Reel) ---------- */
.video-embed{max-width:340px;margin:0 auto 34px;}
.video-embed .fb-frame{
  position:relative;width:100%;aspect-ratio:9/16;
  border-radius:16px;overflow:hidden;border:1px solid var(--card-border);
  box-shadow:var(--shadow);background:#000;
}
.video-embed .fb-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0;}
.video-embed .vid-cap{text-align:center;color:var(--muted);font-size:13px;margin:10px 0 0;}

/* Lưới nhiều Reel */
.reel-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:26px;}
.reel-grid .video-embed{max-width:none;margin:0;}

/* ---------- About ---------- */
.about-grid{display:grid;grid-template-columns:320px 1fr;gap:44px;align-items:start;}
@media(max-width:820px){.about-grid{grid-template-columns:1fr;}}
.portrait{
  border-radius:20px;border:1px solid var(--card-border);overflow:hidden;
  background:linear-gradient(160deg,var(--indigo-700),var(--indigo-850));
  aspect-ratio:3/4;display:flex;align-items:center;justify-content:center;
  color:var(--muted);font-size:15px;text-align:center;padding:20px;box-shadow:var(--shadow);
}
.portrait.has-img{padding:0;}
.portrait img{width:100%;height:100%;object-fit:cover;display:block;}

/* ---------- Pricing / course ---------- */
.benefit-list{list-style:none;padding:0;margin:18px 0 0;}
.benefit-list li{padding:9px 0 9px 32px;position:relative;color:#ddd8f5;}
.benefit-list li::before{content:"✦";position:absolute;left:0;color:var(--gold);}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:18px;}
.contact-item{
  display:flex;align-items:center;gap:14px;padding:18px 20px;
  background:var(--card-bg);border:1px solid var(--card-border);border-radius:14px;transition:border-color .2s,transform .2s;
}
.contact-item:hover{border-color:var(--violet-light);transform:translateY(-3px);}
.contact-item .ci-icon{font-size:26px;}
.contact-item .ci-label{font-size:13px;color:var(--muted);}
.contact-item .ci-value{font-weight:700;color:var(--text);font-size:15px;word-break:break-all;}

/* ---------- CTA band ---------- */
.cta-band{
  text-align:center;border-radius:24px;padding:54px 28px;margin:0 auto;
  background:
    radial-gradient(500px 260px at 50% 0%, rgba(157,134,240,.3), transparent 70%),
    linear-gradient(135deg,var(--indigo-700),var(--indigo-850));
  border:1px solid var(--card-border);box-shadow:var(--shadow);
}
.cta-band h2{font-size:clamp(24px,3.5vw,32px);margin:0 0 12px;color:var(--gold-soft);}
.cta-band p{color:var(--muted);max-width:560px;margin:0 auto 26px;}

/* ---------- Footer ---------- */
.site-footer{border-top:1px solid rgba(61,47,115,.6);padding:44px 0 30px;margin-top:40px;color:var(--muted);}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:32px;}
@media(max-width:760px){.footer-grid{grid-template-columns:1fr;gap:24px;}}
.footer-grid h4{color:var(--gold-soft);font-size:15px;margin:0 0 14px;}
.footer-grid ul{list-style:none;padding:0;margin:0;}
.footer-grid li{margin-bottom:9px;}
.footer-grid a{color:var(--muted);font-size:14px;}
.footer-grid a:hover{color:var(--gold-soft);}
.footer-bottom{text-align:center;margin-top:30px;padding-top:22px;border-top:1px solid rgba(61,47,115,.4);font-size:13px;}
.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:12px;}
.footer-brand .logo{width:40px;height:40px;}

/* ---------- Placeholder note (xóa khi có nội dung thật) ---------- */
.ph{outline:1px dashed rgba(230,192,104,.45);outline-offset:2px;border-radius:4px;}

/* ---------- Floating contact ---------- */
.float-contact{position:fixed;right:18px;bottom:18px;display:flex;flex-direction:column;gap:12px;z-index:60;}
.float-contact a{
  width:54px;height:54px;border-radius:16px;display:flex;align-items:center;justify-content:center;
  overflow:hidden;background:none;border:none;padding:0;
  box-shadow:0 6px 20px rgba(0,0,0,.45);transition:transform .15s;
}
.float-contact a:hover{transform:scale(1.1);}
.float-contact a .brand-ic{width:100%;height:100%;}

/* Logo thương hiệu (SVG) */
.brand-ic{display:block;}
.contact-item .brand-ic{width:34px;height:34px;flex:0 0 34px;}

/* ---------- Reveal animation ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease;}
.reveal.in{opacity:1;transform:none;}