/* ============ tokens ============ */
:root{
  --bg:#0e0e10;
  --bg-2:#141418;
  --surface:#17171b;
  --card:#ffffff;
  --card-alt:#1c1c22;
  --text:#f5f5f7;
  --text-dark:#0f0f12;
  --muted:#8b8b93;
  --muted-2:#6a6a72;
  --border:#26262c;
  --chip:#1e1e24;
  --chip-hover:#26262e;
  --accent:#7c5cff;       /* violet primary */
  --accent-2:#5b3ff0;
  --mint:#6ce9c2;
  --sky:#b7d4ff;
  --lemon:#f4f36a;
  --coral:#ff8a6b;
  --promo:#3b6dff;
}

/* ============ base ============ */
*,*::before,*::after{box-sizing:border-box}
html,body{margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Inter","YS Text",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--text);text-decoration:none}
a:hover{opacity:.85}

/* ============ layout ============ */
.container{max-width:1240px;margin:0 auto;padding:0 24px}
section{padding:64px 0}
h1,h2,h3,h4{margin:0 0 16px;color:var(--text);letter-spacing:-.02em;line-height:1.1}
h1{font-size:56px;font-weight:700}
h2{font-size:40px;font-weight:600}
h3{font-size:22px;font-weight:600}
p{margin:0 0 12px;color:var(--muted);font-size:16px;line-height:1.55}

/* ============ promo bar ============ */
.promo-bar{
  background:var(--promo);
  color:#fff;
  font-size:14px;font-weight:500;
  padding:10px 16px;
  text-align:center;
  display:flex;align-items:center;justify-content:center;gap:14px;
}
.promo-bar .promo-icon{
  display:inline-flex;align-items:center;justify-content:center;
  width:26px;height:26px;border-radius:6px;
  background:rgba(255,255,255,.18);font-weight:700;font-size:12px;
}
.promo-bar strong{font-weight:600;color:#fff}

/* ============ header ============ */
.site-header{
  position:sticky;top:0;z-index:20;
  background:rgba(14,14,16,.85);
  backdrop-filter:saturate(180%) blur(10px);
  border-bottom:1px solid rgba(255,255,255,.05);
}
.nav{
  display:flex;align-items:center;justify-content:space-between;
  padding:16px 0;gap:24px;
}
.logo{
  display:flex;align-items:center;gap:10px;
  font-weight:700;color:var(--text);font-size:20px;letter-spacing:-.01em;
}
.logo-mark{
  width:30px;height:30px;border-radius:8px;
  background:linear-gradient(135deg,var(--accent) 0%,#3d1cd6 100%);
  display:inline-block;position:relative;
}
.logo-mark::after{
  content:"";position:absolute;inset:8px;
  border-radius:4px;background:rgba(255,255,255,.9);
  clip-path:polygon(0 40%,50% 0,100% 40%,80% 100%,20% 100%);
}
.nav-links{
  list-style:none;display:flex;gap:8px;
  padding:0;margin:0;
}
.nav-links a{
  display:inline-block;padding:8px 14px;border-radius:999px;
  color:var(--muted);font-weight:500;font-size:14px;transition:.15s;
}
.nav-links a:hover{color:var(--text);background:var(--chip);opacity:1}
.nav-cta{
  display:inline-flex;align-items:center;padding:10px 18px;
  border-radius:999px;background:var(--text);color:var(--text-dark);
  font-weight:600;font-size:14px;
}
.nav-cta:hover{opacity:.9}

/* ============ hero ============ */
.hero{padding:80px 0 40px;text-align:center}
.hero h1{
  max-width:1000px;margin:0 auto 20px;
  font-size:64px;font-weight:700;
}
.hero .lead{
  max-width:640px;margin:0 auto;
  color:var(--muted);font-size:18px;
}
.hero .lead b{color:var(--text);font-weight:500}

/* ============ filter chips ============ */
.filters{
  display:flex;justify-content:center;gap:10px;flex-wrap:wrap;
  margin:40px auto 0;
}
.chip{
  display:inline-flex;align-items:center;
  padding:12px 22px;border-radius:999px;
  background:var(--chip);color:var(--muted);
  font-size:15px;font-weight:500;
  border:none;cursor:pointer;transition:.15s;
}
.chip:hover{background:var(--chip-hover);color:var(--text)}
.chip.is-active{background:var(--accent);color:#fff}

/* ============ course cards ============ */
.courses{padding-top:48px}
.courses-grid{
  display:grid;grid-template-columns:repeat(2,1fr);gap:20px;
}
.course{
  background:var(--card);color:var(--text-dark);
  border-radius:22px;overflow:hidden;
  display:flex;flex-direction:column;
  transition:transform .2s;
}
.course:hover{transform:translateY(-2px)}
.course-cover{
  aspect-ratio:16/9;
  display:flex;align-items:center;justify-content:center;
  position:relative;overflow:hidden;
  padding:28px;
}
.cover-violet{background:linear-gradient(135deg,#7c5cff 0%,#5b3ff0 100%)}
.cover-mint{background:linear-gradient(135deg,#6ce9c2 0%,#3fbd97 100%)}
.cover-coral{background:linear-gradient(135deg,#ff8a6b 0%,#ff5a3a 100%)}
.cover-sky{background:linear-gradient(135deg,#b7d4ff 0%,#6f9dff 100%)}

.cover-art{
  color:#fff;text-align:center;
  font-family:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:52px;font-weight:600;letter-spacing:-.03em;
  text-shadow:0 4px 20px rgba(0,0,0,.15);
}
.cover-art small{
  display:block;font-size:14px;font-weight:500;
  opacity:.85;margin-top:6px;letter-spacing:.05em;
}

.course-body{padding:24px 26px 26px;display:flex;flex-direction:column;flex:1}
.course-tag{
  color:var(--accent-2);font-size:13px;font-weight:600;
  margin-bottom:10px;
}
.course h3{color:var(--text-dark);font-size:22px;margin-bottom:6px}
.course-sub{color:var(--muted-2);font-size:14px;margin-bottom:14px}
.course-desc{color:#3a3a42;font-size:14px;line-height:1.55;margin-bottom:18px}

.skills-label{color:var(--muted-2);font-size:13px;margin-bottom:10px}
.skills{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:18px}
.skill{
  display:inline-block;padding:6px 12px;border-radius:999px;
  background:#f0f0f2;color:var(--text-dark);font-size:13px;font-weight:500;
}
.course-foot{
  margin-top:auto;
  display:flex;flex-direction:column;gap:12px;
}
.badge-discount{
  display:inline-block;padding:6px 12px;border-radius:999px;
  background:var(--accent);color:#fff;font-size:12px;font-weight:600;
  align-self:flex-start;
}
.btn-course{
  display:block;text-align:center;
  padding:14px 20px;border-radius:14px;
  background:var(--text-dark);color:#fff;
  font-weight:600;font-size:15px;transition:.15s;
}
.btn-course:hover{background:#000;opacity:1}

/* ============ stats block ============ */
.stats-hd{text-align:center;margin-bottom:40px}
.stats-hd h2{font-size:44px}
.stats-grid{
  display:grid;grid-template-columns:1.4fr 1fr;gap:20px;
}
.stat-card{
  border-radius:22px;padding:32px 30px;
  display:flex;flex-direction:column;justify-content:space-between;
  min-height:280px;position:relative;overflow:hidden;
}
.stat-white{background:#fff;color:var(--text-dark)}
.stat-white h3{color:var(--text-dark);font-size:26px;line-height:1.15;font-weight:600}
.stat-white p{color:#4a4a54;font-size:14px}
.stat-violet{background:var(--accent);color:#fff}
.stat-violet h3{color:#fff;font-size:22px;line-height:1.2;font-weight:600}
.stat-violet p{color:rgba(255,255,255,.85);font-size:14px}
.stat-mint{background:var(--mint);color:var(--text-dark)}
.stat-mint h3{color:var(--text-dark);font-size:22px;font-weight:600}
.stat-lemon{background:var(--lemon);color:var(--text-dark)}
.stat-lemon h3{color:var(--text-dark);font-size:22px;font-weight:600}

.big-num{
  font-size:64px;font-weight:700;letter-spacing:-.03em;line-height:1;
  margin-top:20px;
}
.stat-white .big-num{color:var(--accent)}
.stat-mint .big-num{font-size:48px}
.stat-lemon .big-num{font-size:48px}

.source{color:var(--muted-2);font-size:12px;margin-top:12px}
.source a{color:var(--muted-2);text-decoration:underline}

/* ============ help grid ============ */
.help-hd{text-align:center;margin-bottom:40px}
.help-grid{
  display:grid;grid-template-columns:1fr 1fr;gap:20px;
}
.help-card{
  border-radius:22px;padding:32px 30px;
  min-height:220px;position:relative;overflow:hidden;
}
.hc-mint{background:#3fbd97;color:#fff}
.hc-mint h3,.hc-mint p{color:#fff}
.hc-mint p{color:rgba(255,255,255,.9)}
.hc-white{background:#fff;color:var(--text-dark)}
.hc-white h3{color:var(--text-dark)}
.hc-white p{color:#4a4a54}
.hc-sky{background:var(--sky);color:var(--text-dark)}
.hc-sky h3{color:var(--text-dark)}
.hc-sky p{color:#324b78}
.hc-coral{background:var(--coral);color:#fff}
.hc-coral h3,.hc-coral p{color:#fff}
.hc-coral p{color:rgba(255,255,255,.9)}
.help-card h3{font-size:22px;font-weight:600;margin-bottom:8px}
.help-card p{font-size:14px}

/* ============ form ============ */
.lead-section{padding:80px 0}
.lead-wrap{
  max-width:640px;margin:0 auto;
  background:var(--card-alt);border:1px solid var(--border);
  border-radius:22px;padding:36px;
}
.lead-wrap h2{font-size:32px;text-align:center;margin-bottom:8px}
.lead-wrap .lead-sub{
  text-align:center;color:var(--muted);
  margin-bottom:28px;font-size:15px;
}
.field{display:block;margin-bottom:14px}
.field label{
  display:block;font-size:13px;color:var(--muted);
  margin-bottom:6px;font-weight:500;
}
.field input,.field textarea{
  width:100%;padding:14px 16px;border-radius:12px;
  border:1px solid var(--border);background:#0e0e12;
  color:var(--text);font:inherit;
  transition:border-color .15s,box-shadow .15s;
}
.field input:focus,.field textarea:focus{
  outline:none;border-color:var(--accent);
  box-shadow:0 0 0 3px rgba(124,92,255,.18);
}
.field textarea{resize:vertical;min-height:100px}
.btn-primary{
  width:100%;padding:14px 20px;border-radius:12px;border:none;
  background:var(--accent);color:#fff;font-weight:600;font-size:15px;
  cursor:pointer;transition:.15s;
}
.btn-primary:hover{background:var(--accent-2)}
.form-note{font-size:12px;color:var(--muted-2);margin-top:12px;text-align:center}
.form-note a{color:var(--muted);text-decoration:underline}
.msg-ok{
  display:none;margin-top:14px;padding:12px 14px;border-radius:10px;
  background:rgba(108,233,194,.12);color:#6ce9c2;
  border:1px solid rgba(108,233,194,.25);font-size:14px;text-align:center;
}

/* ============ page (docs) ============ */
.page{padding:64px 0 40px}
.page-inner{max-width:820px;margin:0 auto}
.page h1{font-size:44px;margin-bottom:8px}
.page .meta{color:var(--muted-2);font-size:14px;margin-bottom:32px}
.page h2{font-size:22px;margin-top:36px}
.page p,.page li{color:#c8c8d0}
.page ul{padding-left:22px}
.page li{margin-bottom:6px}
.page a{color:#a898ff;text-decoration:underline}

/* ============ footer ============ */
.site-footer{
  background:var(--bg);
  border-top:1px solid rgba(255,255,255,.06);
  padding:56px 0 32px;margin-top:40px;
}
.footer-top{
  display:flex;align-items:center;justify-content:space-between;
  gap:16px;margin-bottom:40px;flex-wrap:wrap;
}
.footer-social{display:flex;gap:10px}
.social-chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 14px;border-radius:999px;
  background:var(--chip);color:var(--text);
  font-size:13px;font-weight:500;
}
.footer-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:32px;
}
.footer-col h4{
  color:var(--muted-2);font-size:14px;font-weight:500;
  margin:0 0 16px;text-transform:none;letter-spacing:0;
}
.footer-col ul{list-style:none;padding:0;margin:0}
.footer-col li{margin-bottom:12px;font-size:15px}
.footer-col a{color:var(--text);font-weight:400}
.footer-col a:hover{color:var(--accent);opacity:1}
.footer-bottom{
  margin-top:48px;padding-top:24px;
  border-top:1px solid rgba(255,255,255,.06);
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;
  color:var(--muted-2);font-size:13px;
}
.footer-bottom a{color:var(--muted-2);text-decoration:underline}

/* ============ responsive ============ */
@media (max-width:960px){
  h1{font-size:40px}
  h2{font-size:30px}
  .hero{padding:48px 0 24px}
  .hero h1{font-size:40px}
  .courses-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:1fr}
  .help-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .nav-links{display:none}
}
@media (max-width:560px){
  section{padding:48px 0}
  .container{padding:0 16px}
  .footer-grid{grid-template-columns:1fr}
  .lead-wrap{padding:24px}
  .hero h1{font-size:34px}
  .stats-hd h2{font-size:30px}
  .big-num{font-size:48px}
  .promo-bar{font-size:13px;gap:10px}
}