/* =========================================================
   MARKETING DU KÍCH — Design System
   "Ít tiền. Nhiều chiêu. Thắng lớn."
   ========================================================= */

/* ---------- Tokens ---------- */
:root {
  --bg-primary:      #0D1117;
  --bg-secondary:    #1C2333;
  --bg-elevated:     #232B3D;
  --bg-light:        #F8F7F4;
  --accent:          #FF5500;
  --accent-dark:     #E64D00;
  --accent-glow:     rgba(255, 85, 0, 0.45);
  --yellow:          #F5C518;
  --green:           #10B981;

  --text-primary:    #FFFFFF;
  --text-body:       #C9D1D9;
  --text-muted:      #8B97A8;
  --text-dark:       #0D1117;
  --text-dark-body:  #2D3748;

  --border:          rgba(255, 255, 255, 0.07);
  --border-hover:    rgba(255, 85, 0, 0.35);

  --font-head: 'Barlow Condensed', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;

  --maxw: 1200px;
  --radius-btn: 6px;
  --radius-card: 14px;
  --shadow-card: 0 10px 30px rgba(0,0,0,.35);
  --shadow-btn:  0 6px 18px var(--accent-glow);
  --header-h: 72px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-body);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

/* ---------- Typography ---------- */
h1,h2,h3,h4 { font-family: var(--font-head); color: var(--text-primary); line-height: 1.1; font-weight: 700; }
h1 { font-size: clamp(2.4rem, 6vw, 4rem); font-weight: 800; }
h2 { font-size: clamp(1.9rem, 4vw, 2.6rem); text-transform: uppercase; letter-spacing: .01em; }
h3 { font-size: 1.55rem; font-weight: 600; }
h4 { font-size: 1.2rem; font-weight: 600; }
p { margin-bottom: 1rem; }
.lead { font-size: 1.15rem; color: var(--text-body); }

/* ---------- Layout ---------- */
.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: 24px; }
.section { padding-block: clamp(56px, 9vw, 100px); position: relative; }
.section--alt { background: linear-gradient(180deg, #0D1117, #121A28); }
.section--light { background: var(--bg-light); color: var(--text-dark-body); }
.section--light h1,.section--light h2,.section--light h3,.section--light h4 { color: var(--text-dark); }
.grid { display: grid; gap: 24px; }
.text-center { text-align: center; }
.mx-auto { margin-inline: auto; }
.maxw-720 { max-width: 720px; }

/* ---------- Section label / heading ---------- */
.eyebrow {
  font-family: var(--font-head);
  font-weight: 600; font-size: .9rem; letter-spacing: .18em; text-transform: uppercase;
  color: var(--accent); display: inline-flex; align-items: center; gap: 10px; margin-bottom: 14px;
}
.eyebrow::before { content:""; width: 26px; height: 2px; background: var(--accent); display:block; }
.section-head { margin-bottom: 48px; }
.section-head p { color: var(--text-muted); max-width: 640px; }
.section--light .section-head p { color: #5b6573; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--font-head); font-weight: 700; font-size: 1rem;
  letter-spacing: .06em; text-transform: uppercase;
  padding: 14px 28px; border-radius: var(--radius-btn);
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease, color .2s ease;
  white-space: nowrap;
}
.btn-primary { background: var(--accent); color: #fff; box-shadow: var(--shadow-btn); }
.btn-primary:hover { background: var(--accent-dark); transform: translateY(-2px); box-shadow: 0 10px 26px var(--accent-glow); }
.btn-primary:active { transform: translateY(0); }
.btn-secondary { background: transparent; color: var(--accent); border: 2px solid var(--accent); padding: 12px 26px; }
.btn-secondary:hover { background: rgba(255,85,0,.1); transform: translateY(-2px); }
.btn-ghost { background: rgba(255,255,255,.05); color: var(--text-body); border:1px solid var(--border); font-family: var(--font-body); text-transform:none; letter-spacing:0; font-weight:500; }
.btn-ghost:hover { background: rgba(255,255,255,.1); }
.btn-lg { padding: 17px 36px; font-size: 1.1rem; }
.btn-block { width: 100%; }

/* ---------- Badges ---------- */
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: .7rem; font-weight: 600; letter-spacing: .05em; text-transform: uppercase;
  padding: 5px 11px; border-radius: 5px; line-height: 1;
}
.badge-hot  { background: rgba(255,85,0,.16);  color: #FF7733; }
.badge-new  { background: rgba(245,197,24,.16); color: var(--yellow); }
.badge-free { background: rgba(16,185,129,.16); color: var(--green); }
.badge-hot.solid { background: var(--accent); color:#fff; }

/* ---------- Header ---------- */
.topbar { background: #080B10; font-size: .82rem; color: var(--text-muted); border-bottom: 1px solid var(--border); }
.topbar .container { display: flex; justify-content: space-between; align-items: center; min-height: 38px; gap: 16px; }
.topbar a:hover { color: var(--accent); }
.topbar .tb-social { display: flex; gap: 14px; align-items:center; }

.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(13,17,23,.85); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border); transition: background .3s, box-shadow .3s;
}
.site-header.scrolled { background: rgba(13,17,23,.97); box-shadow: 0 8px 30px rgba(0,0,0,.4); }
.nav { display: flex; align-items: center; justify-content: space-between; min-height: var(--header-h); gap: 20px; }
.logo { display: flex; align-items: center; gap: 10px; font-family: var(--font-head); font-weight: 800; font-size: 1.35rem; letter-spacing:.02em; color:#fff; text-transform: uppercase; }
.logo .logo-mark { width: 38px; height: 38px; flex: none; }
.logo b { color: var(--accent); }
.nav-links { display: flex; gap: 4px; align-items: center; }
.nav-links a {
  font-family: var(--font-head); font-weight: 600; font-size: 1.02rem; letter-spacing:.02em;
  text-transform: uppercase; color: var(--text-body); padding: 8px 12px; border-radius: 6px;
  transition: color .2s, background .2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); background: rgba(255,85,0,.08); }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.nav-search { background:none; color: var(--text-muted); padding: 8px; border-radius: 6px; display:flex; }
.nav-search:hover { color: var(--accent); }
.hamburger { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.hamburger span { width: 24px; height: 2px; background: #fff; transition: .3s; }

/* mobile menu */
.mobile-menu {
  position: fixed; inset: 0; z-index: 200; background: rgba(13,17,23,.98);
  backdrop-filter: blur(8px); transform: translateX(100%); transition: transform .35s ease;
  display: flex; flex-direction: column; padding: 24px;
}
.mobile-menu.open { transform: translateX(0); }
.mobile-menu .mm-top { display:flex; justify-content: space-between; align-items:center; margin-bottom: 32px; }
.mobile-menu .mm-close { font-size: 2rem; color:#fff; line-height:1; }
.mobile-menu a { font-family: var(--font-head); text-transform: uppercase; font-size: 1.5rem; font-weight:700; padding: 14px 0; border-bottom: 1px solid var(--border); color: var(--text-primary); }
.mobile-menu a:hover { color: var(--accent); }
.mobile-menu .btn { margin-top: 24px; }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding-block: clamp(60px, 10vw, 110px); }
.hero::before {
  content:""; position:absolute; inset:0; z-index:0;
  background:
    radial-gradient(900px 500px at 80% -10%, rgba(255,85,0,.18), transparent 60%),
    radial-gradient(700px 500px at 10% 110%, rgba(245,197,24,.08), transparent 60%);
}
.hero .container { position: relative; z-index: 1; }
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 50px; align-items: center; }
.hero h1 span { color: var(--accent); }
.hero .lead { margin: 20px 0 30px; max-width: 560px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 34px; }
.hero-trust { display: flex; gap: 28px; flex-wrap: wrap; padding-top: 26px; border-top: 1px solid var(--border); }
.hero-trust .stat b { font-family: var(--font-head); font-size: 2rem; color: #fff; display:block; line-height:1; }
.hero-trust .stat span { font-size: .85rem; color: var(--text-muted); }
.hero-visual { position: relative; }
.hero-visual img { width: 100%; border-radius: 18px; border: 1px solid var(--border); box-shadow: 0 24px 60px rgba(0,0,0,.55); display:block; }
.hero-visual .hv-badge { position:absolute; left:-14px; bottom:24px; background: var(--accent); color:#fff; font-family:var(--font-head); font-weight:800; padding:14px 20px; border-radius:12px; box-shadow: var(--shadow-btn); line-height:1; }
.hero-visual .hv-badge b { font-size:1.8rem; display:block; } .hero-visual .hv-badge span { font-size:.8rem; opacity:.9; }
@media (max-width:980px){ .hero-visual .hv-badge{ left:8px; } }

/* stencil / pattern */
.stencil-tag {
  display:inline-flex; align-items:center; gap:8px; font-family:var(--font-head); font-weight:700;
  text-transform: uppercase; letter-spacing:.1em; color: var(--yellow);
  border: 2px dashed rgba(245,197,24,.5); padding: 6px 14px; border-radius: 6px; font-size:.85rem; margin-bottom: 22px;
}

/* ---------- Value props ---------- */
.value-grid { grid-template-columns: repeat(4, 1fr); }
.value-card { background: var(--bg-secondary); border:1px solid var(--border); border-radius: var(--radius-card); padding: 28px 24px; transition: transform .25s, border-color .25s; }
.value-card:hover { transform: translateY(-5px); border-color: var(--border-hover); box-shadow: var(--shadow-card); }
.value-card .ico { width: 52px; height: 52px; border-radius: 12px; background: rgba(255,85,0,.12); display:grid; place-items:center; margin-bottom: 18px; color: var(--accent); }
.value-card h4 { margin-bottom: 8px; }
.value-card p { font-size: .94rem; color: var(--text-muted); margin: 0; }

/* ---------- Pillar cards ---------- */
.pillar-grid { grid-template-columns: 1fr 1fr; }
.pillar {
  position: relative; border-radius: var(--radius-card); overflow: hidden; min-height: 300px;
  display: flex; flex-direction: column; justify-content: flex-end; padding: 36px;
  border: 1px solid var(--border); transition: transform .3s, box-shadow .3s;
}
.pillar:hover { transform: translateY(-6px); box-shadow: var(--shadow-card); }
.pillar .pillar-bg { position:absolute; inset:0; z-index:0; opacity:.9; }
.pillar > * { position: relative; z-index: 1; }
.pillar h3 { font-size: 1.9rem; text-transform: uppercase; margin-bottom: 10px; }
.pillar p { color: rgba(255,255,255,.85); margin-bottom: 18px; max-width: 90%; }
.pillar .arrow-link { font-family: var(--font-head); font-weight:700; text-transform: uppercase; color: var(--yellow); letter-spacing:.05em; display:inline-flex; gap:8px; }
.pillar:hover .arrow-link { gap: 14px; }

/* ---------- Steps / Roadmap ---------- */
.steps { grid-template-columns: repeat(4, 1fr); counter-reset: step; }
.step { text-align: center; position: relative; padding: 0 10px; }
.step .num { font-family: var(--font-head); font-weight:800; font-size: 2.6rem; color: var(--accent); opacity:.5; line-height:1; }
.step h4 { margin: 8px 0; }
.step p { font-size: .9rem; color: var(--text-muted); margin:0; }

/* ---------- Course cards ---------- */
.course-grid { grid-template-columns: repeat(3, 1fr); }
.card {
  background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius-card);
  overflow: hidden; transition: transform .25s, border-color .25s, box-shadow .25s; display:flex; flex-direction:column;
}
.card:hover { transform: translateY(-6px); border-color: var(--border-hover); box-shadow: var(--shadow-card); }
.card-media { aspect-ratio: 16/10; position: relative; overflow: hidden; }
.card-media .badge { position: absolute; top: 12px; left: 12px; z-index:2; }
.card-body { padding: 22px; display:flex; flex-direction:column; flex:1; gap: 10px; }
.card-cat { font-size:.78rem; font-weight:600; text-transform:uppercase; letter-spacing:.06em; color: var(--accent); }
.card-body h3 { font-size: 1.25rem; }
.card-body p { font-size:.92rem; color: var(--text-muted); margin:0; }
.card-foot { margin-top: auto; padding-top: 14px; display:flex; align-items:center; justify-content:space-between; gap:10px; border-top: 1px solid var(--border); }
.price { font-family: var(--font-head); }
.price b { font-size: 1.35rem; color: #fff; }
.price s { color: var(--text-muted); font-size: .9rem; margin-left: 6px; }
.price .free { color: var(--green); }
.meta-list { display:flex; flex-wrap:wrap; gap: 8px 16px; font-size:.84rem; color: var(--text-muted); }
.meta-list span { display:inline-flex; gap:6px; align-items:center; }

/* ---------- Stats band ---------- */
.stats-band { grid-template-columns: repeat(4,1fr); text-align:center; }
.stats-band .num { font-family: var(--font-head); font-weight:800; font-size: clamp(2.4rem,5vw,3.4rem); color: var(--accent); line-height:1; }
.stats-band .lbl { color: var(--text-muted); font-size:.95rem; margin-top:6px; }

/* ---------- Testimonials ---------- */
.tstack { display:grid; grid-template-columns: repeat(3,1fr); gap:24px; }
.tcard { background: var(--bg-secondary); border:1px solid var(--border); border-radius: var(--radius-card); padding: 26px; }
.tcard .stars { color: var(--yellow); margin-bottom: 12px; letter-spacing:2px; }
.tcard q { display:block; font-size: 1.02rem; color: var(--text-body); margin-bottom: 18px; font-style: italic; }
.tcard .who { display:flex; align-items:center; gap:12px; }
.tcard .who .ava { width:44px; height:44px; border-radius:50%; flex:none; background: linear-gradient(135deg,var(--accent),var(--yellow)); display:grid; place-items:center; font-family:var(--font-head); font-weight:700; color:#0D1117; }
.tcard .who b { color:#fff; display:block; font-size:.95rem; }
.tcard .who span { font-size:.82rem; color: var(--text-muted); }

/* ---------- Lead band ---------- */
.lead-band { background: linear-gradient(120deg, #FF5500, #E64D00); border-radius: 20px; padding: clamp(32px,5vw,56px); position: relative; overflow:hidden; }
.lead-band::after { content:""; position:absolute; right:-60px; top:-60px; width:260px; height:260px; border:30px solid rgba(255,255,255,.12); border-radius:50%; }
.lead-band h2 { color:#fff; }
.lead-band p { color: rgba(255,255,255,.92); }
.lead-form { display:flex; gap:12px; flex-wrap:wrap; margin-top: 22px; max-width: 560px; }
.lead-form input { flex:1; min-width: 220px; padding: 15px 18px; border-radius: var(--radius-btn); border:none; font-size:1rem; }
.lead-band .btn-primary { background:#0D1117; box-shadow:none; }
.lead-band .btn-primary:hover { background:#000; }
.lead-note { font-size:.82rem; color: rgba(255,255,255,.85); margin-top: 12px; }

/* ---------- Blog cards ---------- */
.blog-grid { grid-template-columns: repeat(3,1fr); }
.post .card-media { aspect-ratio: 16/9; }
.post .date { font-size:.8rem; color: var(--text-muted); }

/* ---------- About mini ---------- */
.about-mini { display:grid; grid-template-columns: .8fr 1.2fr; gap:44px; align-items:center; }
.about-photo { border-radius: var(--radius-card); overflow:hidden; border:1px solid var(--border); aspect-ratio: 4/5; }
.about-photo img { width:100%; height:100%; object-fit:cover; display:block; }

/* ---------- FAQ ---------- */
.faq { max-width: 800px; margin-inline:auto; }
.faq-item { border:1px solid var(--border); border-radius: 10px; margin-bottom: 12px; overflow:hidden; background: var(--bg-secondary); }
.faq-q { width:100%; text-align:left; display:flex; justify-content:space-between; align-items:center; gap:16px; padding: 18px 22px; font-family: var(--font-head); font-weight:600; font-size:1.15rem; color:#fff; }
.faq-q .pm { color: var(--accent); font-size: 1.6rem; line-height:1; transition: transform .3s; flex:none; }
.faq-item.open .pm { transform: rotate(45deg); }
.faq-a { max-height:0; overflow:hidden; transition: max-height .35s ease; }
.faq-a p { padding: 0 22px 20px; color: var(--text-muted); margin:0; }

/* ---------- Footer ---------- */
.site-footer { background: #080B10; border-top: 1px solid var(--border); padding-block: 56px 24px; }
.footer-grid { display:grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 36px; }
.footer-grid h5 { font-family: var(--font-head); text-transform: uppercase; letter-spacing:.05em; color:#fff; font-size:1.05rem; margin-bottom:16px; }
.footer-grid a { color: var(--text-muted); display:block; padding: 5px 0; font-size:.92rem; transition: color .2s; }
.footer-grid a:hover { color: var(--accent); }
.footer-about p { color: var(--text-muted); font-size:.92rem; }
.footer-social { display:flex; gap:12px; margin-top:16px; }
.footer-social a { width:38px; height:38px; border:1px solid var(--border); border-radius:8px; display:grid; place-items:center; color: var(--text-body); }
.footer-social a:hover { background: var(--accent); color:#fff; border-color: var(--accent); }
.footer-bottom { border-top:1px solid var(--border); margin-top: 40px; padding-top: 22px; display:flex; justify-content:space-between; gap:14px; flex-wrap:wrap; font-size:.85rem; color: var(--text-muted); }
.footer-bottom a:hover { color: var(--accent); }

/* ---------- Article / Prose upgrade ---------- */
.read-progress{position:fixed;top:0;left:0;height:3px;width:0;background:linear-gradient(90deg,var(--accent),var(--yellow));z-index:300;transition:width .12s ease;box-shadow:0 0 10px var(--accent-glow)}
.art-feat{max-width:920px;margin:0 auto 22px;border-radius:18px;overflow:hidden;aspect-ratio:21/9;border:1px solid var(--border);box-shadow:var(--shadow-card)}
.art-feat img{width:100%;height:100%;object-fit:cover;display:block}
.art-byline{max-width:820px;margin:0 auto 26px;display:flex;align-items:center;gap:12px;padding-bottom:20px;border-bottom:1px solid var(--border)}
.art-byline .ava{width:44px;height:44px;border-radius:50%;flex:none;background:linear-gradient(135deg,var(--accent),var(--yellow));display:grid;place-items:center;font-family:var(--font-head);font-weight:800;color:#0D1117;font-size:1.1rem}
.art-byline b{color:#fff;display:block;font-size:.95rem}.art-byline span{color:var(--text-muted);font-size:.85rem}
.prose>p:first-of-type{font-size:1.18rem;color:#dfe6ee;line-height:1.75}
.prose h2{position:relative;padding-left:18px;margin:44px 0 16px;font-size:clamp(1.6rem,3vw,2rem)}
.prose h2::before{content:"";position:absolute;left:0;top:5px;bottom:5px;width:5px;border-radius:3px;background:linear-gradient(180deg,var(--accent),var(--yellow))}
.prose h3{color:#fff;display:flex;align-items:flex-start;gap:9px}
.prose h3::before{content:"▹";color:var(--accent);font-weight:700}
.prose a{color:var(--accent);border-bottom:1px solid rgba(255,85,0,.4)}
.prose a:hover{border-bottom-color:var(--accent)}
.prose .callout{background:linear-gradient(135deg,rgba(255,85,0,.1),rgba(245,197,24,.04))}
.prose ul.bullet li{font-size:1.02rem}

/* ---------- Comparison ---------- */
.compare{display:grid;grid-template-columns:1fr 1fr;gap:18px;max-width:920px;margin-inline:auto}
.comp-col{border:1px solid var(--border);border-radius:var(--radius-card);padding:26px;background:var(--bg-secondary)}
.comp-col.win{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent) inset, 0 14px 36px rgba(255,85,0,.18);position:relative}
.comp-col h3{font-size:1.4rem;text-transform:uppercase;margin-bottom:16px}
.comp-col.win h3{color:var(--accent)}
.comp-col ul{display:grid;gap:12px}
.comp-col li{display:flex;gap:10px;align-items:flex-start;color:var(--text-body);font-size:.96rem}
.comp-col li::before{content:"✕";color:var(--text-muted);font-weight:700;flex:none}
.comp-col.win li::before{content:"✓";color:var(--accent)}
.comp-col .tag{position:absolute;top:-12px;right:18px;background:var(--accent);color:#fff;font-family:var(--font-head);font-weight:700;font-size:.72rem;letter-spacing:.05em;text-transform:uppercase;padding:4px 12px;border-radius:20px}
@media(max-width:680px){.compare{grid-template-columns:1fr}}

/* ---------- Social follow buttons ---------- */
.soc-btns { display:flex; gap:12px; flex-wrap:wrap; }
.soc-btn { display:inline-flex; align-items:center; gap:9px; padding:12px 20px; border-radius:10px; font-family:var(--font-head); font-weight:700; text-transform:uppercase; letter-spacing:.04em; font-size:.98rem; color:#fff; transition:transform .2s, box-shadow .2s; }
.soc-btn svg { width:20px; height:20px; }
.soc-btn:hover { transform:translateY(-3px); }
.soc-fb { background:#1877F2; } .soc-fb:hover { box-shadow:0 10px 24px rgba(24,119,242,.5); }
.soc-yt { background:#FF0000; } .soc-yt:hover { box-shadow:0 10px 24px rgba(255,0,0,.5); }
.soc-tt { background:#010101; border:1px solid #2a2a2a; } .soc-tt:hover { box-shadow:0 10px 24px rgba(37,244,238,.35); }

.footer-follow { border-bottom:1px solid var(--border); padding-block:34px; background:linear-gradient(180deg,#0b0e14,#080B10); }
.footer-follow .ff-inner { display:flex; align-items:center; justify-content:space-between; gap:24px; flex-wrap:wrap; }
.footer-follow h3 { font-size:1.6rem; text-transform:uppercase; margin:6px 0 4px; }
.footer-social a svg { width:18px; height:18px; }
.footer-social a:hover { background:var(--accent); color:#fff; border-color:var(--accent); }

/* ---------- Floating widget ---------- */
.float-cta { position: fixed; right: 18px; bottom: 18px; z-index: 90; display:flex; flex-direction:column; gap:10px; }
.float-cta a { width:52px; height:52px; border-radius:50%; display:grid; place-items:center; color:#fff; box-shadow: 0 6px 18px rgba(0,0,0,.4); transition: transform .2s; position:relative; }
.float-cta a:hover { transform: scale(1.08); }
.float-cta .f-call { background:#16a34a; }
.float-cta .f-zalo { background:#0068ff; font-family:var(--font-head); font-weight:800; font-size:.8rem; }
.float-cta .f-mess { background:#a21caf; }
.float-cta .f-gift { background: var(--accent); }
.float-cta .pulse::after { content:""; position:absolute; inset:0; border-radius:50%; border:2px solid currentColor; animation: pulse 1.8s infinite; }
@keyframes pulse { 0%{transform:scale(1);opacity:.7} 100%{transform:scale(1.7);opacity:0} }

.to-top { position: fixed; left: 18px; bottom: 18px; z-index:90; width:46px; height:46px; border-radius:10px; background: var(--bg-elevated); border:1px solid var(--border); color:#fff; display:grid; place-items:center; opacity:0; pointer-events:none; transition: opacity .3s, transform .3s; }
.to-top.show { opacity:1; pointer-events:auto; }
.to-top:hover { background: var(--accent); }

/* ---------- Popup ---------- */
.popup-overlay { position: fixed; inset:0; z-index:300; background: rgba(0,0,0,.7); backdrop-filter: blur(4px); display:none; place-items:center; padding:20px; }
.popup-overlay.open { display:grid; }
.popup { background: var(--bg-secondary); border:1px solid var(--border-hover); border-radius: 18px; max-width: 460px; width:100%; padding: 36px; position: relative; text-align:center; animation: pop .35s ease; }
@keyframes pop { from{transform:scale(.92);opacity:0} to{transform:scale(1);opacity:1} }
.popup .px { position:absolute; top:14px; right:16px; font-size:1.6rem; color: var(--text-muted); line-height:1; }
.popup .px:hover { color: var(--accent); }
.popup .gift-ico { width:64px; height:64px; margin:0 auto 16px; color: var(--accent); }
.popup h3 { font-size:1.6rem; text-transform:uppercase; margin-bottom:10px; }
.popup p { color: var(--text-muted); font-size:.95rem; }
.popup form { display:grid; gap:10px; margin-top:18px; }
.popup input { padding: 14px 16px; border-radius: var(--radius-btn); border:1px solid var(--border); background: var(--bg-primary); color:#fff; font-size:1rem; }

/* ---------- Page hero (subpages) ---------- */
.page-hero { padding-block: clamp(50px,8vw,80px); position:relative; overflow:hidden; border-bottom:1px solid var(--border); }
.page-hero::before { content:""; position:absolute; inset:0; background: radial-gradient(700px 380px at 75% -20%, rgba(255,85,0,.16), transparent 60%); }
.page-hero .container { position:relative; z-index:1; }
.breadcrumb { font-size:.85rem; color: var(--text-muted); margin-bottom:14px; display:flex; gap:8px; flex-wrap:wrap; }
.breadcrumb a:hover { color: var(--accent); }
.page-hero h1 { max-width: 800px; }
.page-hero p { color: var(--text-body); max-width: 680px; margin-top:14px; }

/* ---------- Prose (article / pillar content) ---------- */
.prose { max-width: 820px; }
.prose h2 { font-size:1.8rem; margin: 38px 0 16px; }
.prose h3 { margin: 26px 0 12px; color: var(--accent); }
.prose p { color: var(--text-body); }
.prose ul.bullet { margin: 0 0 18px; padding-left: 4px; }
.prose ul.bullet li { position: relative; padding-left: 28px; margin-bottom: 10px; color: var(--text-body); }
.prose ul.bullet li::before { content:"▸"; position:absolute; left:4px; color: var(--accent); font-weight:700; }
.callout { background: var(--bg-secondary); border-left: 4px solid var(--accent); border-radius: 10px; padding: 20px 24px; margin: 22px 0; }
.callout b { color:#fff; }

/* tactic / list cards */
.feature-grid { grid-template-columns: repeat(3,1fr); }
.feature { background: var(--bg-secondary); border:1px solid var(--border); border-radius: var(--radius-card); padding: 26px; transition: transform .25s, border-color .25s; }
.feature:hover { transform: translateY(-5px); border-color: var(--border-hover); }
.feature .ico { width:48px;height:48px;border-radius:11px;background:rgba(255,85,0,.12);display:grid;place-items:center;color:var(--accent);margin-bottom:16px; }
.feature h4 { margin-bottom:8px; }
.feature p { font-size:.92rem; color: var(--text-muted); margin:0; }
.num-badge { width:42px;height:42px;border-radius:10px;background:var(--accent);color:#fff;font-family:var(--font-head);font-weight:800;font-size:1.3rem;display:grid;place-items:center;flex:none; }

/* contact */
.contact-grid { grid-template-columns: 1fr 1fr; gap:44px; align-items:start; }
.field { display:grid; gap:6px; margin-bottom:16px; }
.field label { font-size:.88rem; color: var(--text-body); font-weight:500; }
.field input, .field textarea, .field select { padding: 13px 16px; border-radius: var(--radius-btn); border:1px solid var(--border); background: var(--bg-secondary); color:#fff; font-size:1rem; font-family: var(--font-body); }
.field textarea { min-height: 130px; resize: vertical; }
.info-row { display:flex; gap:14px; align-items:flex-start; padding: 16px 0; border-bottom: 1px solid var(--border); }
.info-row .ico { width:44px;height:44px;border-radius:11px;background:rgba(255,85,0,.12);color:var(--accent);display:grid;place-items:center;flex:none; }
.info-row b { color:#fff; display:block; }
.info-row span { color: var(--text-muted); font-size:.92rem; }

/* form feedback */
.form-msg { padding: 12px 16px; border-radius: 8px; font-size:.92rem; margin-top:12px; display:none; }
.form-msg.show { display:block; }
.form-msg.ok { background: rgba(16,185,129,.15); color: var(--green); }

/* tags / filter */
.filters { display:flex; gap:10px; flex-wrap:wrap; margin-bottom: 34px; }
.chip { font-family: var(--font-head); font-weight:600; text-transform:uppercase; letter-spacing:.04em; font-size:.9rem; padding:8px 16px; border-radius: 30px; border:1px solid var(--border); color: var(--text-body); transition:.2s; }
.chip:hover, .chip.active { background: var(--accent); border-color: var(--accent); color:#fff; }

/* reveal animation */
[data-reveal] { opacity:0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
[data-reveal].in { opacity:1; transform:none; }

/* utilities */
.mt-0{margin-top:0}.mb-0{margin-bottom:0}.mt-1{margin-top:1rem}.mt-2{margin-top:2rem}
.flex{display:flex}.gap-12{gap:12px}.wrap{flex-wrap:wrap}.aic{align-items:center}.jcc{justify-content:center}

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { order:-1; }
  .value-grid { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr 1fr; gap:30px; }
  .course-grid, .blog-grid, .tstack, .feature-grid { grid-template-columns: 1fr 1fr; }
  .pillar-grid { grid-template-columns: 1fr; }
  .stats-band { grid-template-columns: 1fr 1fr; gap:30px; }
  .about-mini, .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 680px) {
  .nav-links, .nav-search { display:none; }
  .hamburger { display:flex; }
  .topbar { display:none; }
  .value-grid, .course-grid, .blog-grid, .tstack, .feature-grid, .stats-band, .steps { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  h2 { font-size: 1.7rem; }
  .nav-actions .btn { padding: 10px 16px; font-size:.9rem; }
}