:root {
  --bg: #0b1220;
  --bg-2: #0f1a2e;
  --surface: #121f36;
  --surface-2: #17284a;
  --line: rgba(148, 178, 222, 0.14);
  --text: #e6edf7;
  --muted: #9fb0c8;
  --accent: #22d3a6;
  --accent-2: #3b82f6;
  --warn: #f5b84b;
  --danger: #f87171;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  --font-head: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { font-family: var(--font-head); line-height: 1.2; margin: 0 0 .6em; letter-spacing: -0.01em; }
h1 { font-size: clamp(2rem, 4.5vw, 3.4rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); }
h3 { font-size: 1.2rem; }
h4 { font-size: .95rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
p { margin: 0 0 1em; }
.muted { color: var(--muted); }
.center { text-align: center; margin-top: 2.5rem; }
.container { width: min(1180px, 100% - 32px); margin-inline: auto; }
.skip { position: absolute; left: -999px; top: 0; background: var(--accent); color: #04211a; padding: 8px 12px; z-index: 100; }
.skip:focus { left: 8px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  background: var(--accent); color: #04211a; font-weight: 600;
  padding: .8rem 1.4rem; border-radius: 10px; border: 1px solid transparent;
  cursor: pointer; font: 600 1rem var(--font-body); transition: transform .15s, background .15s;
}
.btn:hover { text-decoration: none; background: #3ee6bb; transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--line); }
.btn-ghost:hover { background: var(--surface); }
.btn-sm { padding: .5rem 1rem; font-size: .9rem; }
.btn-block { width: 100%; }
.link { display: inline-flex; align-items: center; gap: .3rem; font-weight: 600; }

/* Nav */
.nav { position: sticky; top: 0; z-index: 50; background: rgba(11, 18, 32, .85); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.brand { display: inline-flex; align-items: center; gap: .6rem; color: var(--text); font: 700 1.3rem var(--font-head); }
.brand:hover { text-decoration: none; }
.brand b { color: var(--accent); }
.logo { color: var(--text); }
.nav-links { display: flex; align-items: center; gap: 1.6rem; }
.nav-links a:not(.btn) { color: var(--muted); font-weight: 500; }
.nav-links a:not(.btn):hover, .nav-links a.active { color: var(--text); text-decoration: none; }
.nav-links a.active { box-shadow: 0 2px 0 var(--accent); }
.nav-toggle { display: none; background: none; border: 0; padding: 8px; cursor: pointer; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--text); margin: 5px 0; transition: .2s; }

/* Hero */
.hero { position: relative; overflow: hidden; padding: 80px 0 40px; background: radial-gradient(900px 500px at 80% 0%, rgba(34, 211, 166, .12), transparent 60%), radial-gradient(700px 400px at 0% 100%, rgba(59, 130, 246, .12), transparent 60%); }
.hero-grid-bg { position: absolute; inset: 0; background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px); background-size: 48px 48px; mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%); opacity: .5; pointer-events: none; }
.hero-inner { position: relative; display: grid; grid-template-columns: 1.2fr 1fr; gap: 3rem; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: .4rem; color: var(--accent); font-weight: 600; font-size: .85rem; text-transform: uppercase; letter-spacing: .08em; margin-bottom: 1rem; }
.accent { color: var(--accent); }
.lead { font-size: 1.15rem; color: var(--muted); max-width: 62ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 1.8rem; }

.radar { position: relative; width: min(380px, 80vw); aspect-ratio: 1; margin-inline: auto; border-radius: 50%; background: radial-gradient(circle, rgba(34, 211, 166, .08), transparent 70%); }
.ring { position: absolute; border: 1px solid rgba(34, 211, 166, .3); border-radius: 50%; }
.r1 { inset: 0; } .r2 { inset: 18%; } .r3 { inset: 36%; }
.radar::before, .radar::after { content: ''; position: absolute; background: rgba(34, 211, 166, .2); }
.radar::before { left: 50%; top: 0; bottom: 0; width: 1px; }
.radar::after { top: 50%; left: 0; right: 0; height: 1px; }
.sweep { position: absolute; inset: 0; border-radius: 50%; background: conic-gradient(from 0deg, rgba(34, 211, 166, .45), transparent 25%); animation: spin 4s linear infinite; }
.blip { position: absolute; width: 10px; height: 10px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 14px var(--accent); animation: pulse 2.4s ease-in-out infinite; }
.b1 { top: 24%; left: 62%; } .b2 { top: 60%; left: 28%; animation-delay: .8s; } .b3 { top: 70%; left: 70%; animation-delay: 1.6s; background: var(--warn); box-shadow: 0 0 14px var(--warn); }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse { 0%, 100% { opacity: .25; transform: scale(.8); } 50% { opacity: 1; transform: scale(1.2); } }

.stats { position: relative; display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; margin-top: 4rem; padding: 1.5rem; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.stat { text-align: center; }
.stat strong { display: block; font: 700 1.5rem var(--font-head); color: var(--text); }
.stat span { color: var(--muted); font-size: .9rem; }

/* Sections */
.section { padding: 80px 0; }
.section.alt { background: var(--bg-2); border-block: 1px solid var(--line); }
.section-head { max-width: 680px; margin-bottom: 2.5rem; }
.page-hero { padding: 70px 0 40px; background: radial-gradient(800px 400px at 90% 0%, rgba(34, 211, 166, .1), transparent 60%); border-bottom: 1px solid var(--line); }
.page-hero h1 { max-width: 22ch; }
.back { display: block; color: var(--muted); margin-bottom: 1rem; }
.notfound { padding: 120px 0; text-align: left; }

.grid { display: grid; gap: 1.4rem; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.split { display: grid; grid-template-columns: 1fr 1.2fr; gap: 3rem; align-items: start; }

/* Cards */
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.6rem; transition: border-color .2s, transform .2s; }
.card p { color: var(--muted); }
.course-card { display: flex; flex-direction: column; }
.course-card:hover, .feature:hover, .service:hover { border-color: rgba(34, 211, 166, .45); transform: translateY(-3px); }
.course-card h3 a { color: var(--text); }
.course-card p { flex: 1; }
.card-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }
.icon-box { display: inline-grid; place-items: center; width: 46px; height: 46px; border-radius: 12px; background: rgba(34, 211, 166, .12); color: var(--accent); flex-shrink: 0; }
.feature .icon-box, .service .icon-box { margin-bottom: 1rem; }
.badge { display: inline-block; font-size: .75rem; font-weight: 600; padding: .25rem .65rem; border-radius: 999px; border: 1px solid; margin-bottom: .6rem; }
.card-top .badge { margin: 0; }
.badge-beginner { color: var(--accent); border-color: rgba(34, 211, 166, .4); }
.badge-intermediate { color: #7fb0ff; border-color: rgba(59, 130, 246, .45); }
.badge-advanced { color: var(--warn); border-color: rgba(245, 184, 75, .45); }
.meta { list-style: none; padding: 0; margin: 0 0 1rem; display: flex; flex-wrap: wrap; gap: .4rem 1rem; color: var(--muted); font-size: .88rem; }
.meta li { display: inline-flex; align-items: center; gap: .35rem; }
.meta-lg { font-size: 1rem; margin-top: 1rem; }
.meta-lg strong { color: var(--text); }
.card-foot { display: flex; justify-content: space-between; align-items: center; padding-top: 1rem; border-top: 1px solid var(--line); }

.checks { list-style: none; padding: 0; margin: 0 0 2rem; }
.checks li { display: flex; gap: .6rem; align-items: flex-start; padding: .35rem 0; }
.checks .icon { color: var(--accent); margin-top: 4px; flex-shrink: 0; }
.syllabus { margin: 0 0 2rem; padding-left: 1.2rem; }
.syllabus li { padding: .45rem 0; border-bottom: 1px dashed var(--line); }
.values .card h3 { color: var(--accent); }

.steps { list-style: none; counter-reset: s; padding: 0; margin: 0; display: grid; gap: 1rem; }
.steps li { counter-increment: s; display: grid; grid-template-columns: 48px 1fr; grid-template-rows: auto auto; column-gap: 1rem; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.1rem 1.3rem; }
.steps li::before { content: counter(s, decimal-leading-zero); grid-row: span 2; font: 700 1.4rem var(--font-head); color: var(--accent); }
.steps span { color: var(--muted); }

.filters { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1.5rem; }
.chip { padding: .45rem 1rem; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); font-weight: 500; }
.chip:hover { text-decoration: none; color: var(--text); }
.chip.active { background: var(--accent); color: #04211a; border-color: var(--accent); }

/* Course detail & forms */
.course-layout { display: grid; grid-template-columns: 1.5fr 1fr; gap: 3rem; align-items: start; }
.enroll { position: sticky; top: 90px; }
.contact-layout { display: grid; grid-template-columns: 1.6fr 1fr; gap: 2rem; align-items: start; }
.form { display: grid; gap: 1rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form label { display: grid; gap: .35rem; font-size: .9rem; font-weight: 500; color: var(--muted); }
.form input, .form select, .form textarea {
  width: 100%; background: var(--bg); color: var(--text); border: 1px solid var(--line);
  border-radius: 10px; padding: .75rem .9rem; font: inherit; font-size: 1rem;
}
.form input:focus, .form select:focus, .form textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(34, 211, 166, .2); }
.hp { position: absolute !important; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.alert { padding: .9rem 1rem; border-radius: 10px; margin-bottom: 1rem; }
.alert.success { background: rgba(34, 211, 166, .12); border: 1px solid rgba(34, 211, 166, .4); color: #a7f3d0; }
.alert.error { background: rgba(248, 113, 113, .12); border: 1px solid rgba(248, 113, 113, .4); color: #fecaca; }
.contact-info { display: grid; gap: 1rem; }
.info-item { display: flex; gap: 1rem; align-items: center; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem 1.2rem; }
.info-item h4 { margin: 0 0 .1rem; font-size: .8rem; }

/* CTA + footer */
.cta-band { padding: 60px 0; background: linear-gradient(120deg, rgba(34, 211, 166, .14), rgba(59, 130, 246, .14)); border-top: 1px solid var(--line); }
.cta-inner { display: flex; justify-content: space-between; align-items: center; gap: 2rem; flex-wrap: wrap; }
.cta-inner h2 { margin-bottom: .3rem; }
.cta-inner p { color: var(--muted); margin: 0; }
.cta-actions { display: flex; gap: .8rem; flex-wrap: wrap; }
.footer { padding: 60px 0 24px; background: #080e1a; border-top: 1px solid var(--line); }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 2rem; }
.footer-grid > div { display: flex; flex-direction: column; gap: .45rem; }
.footer-grid a:not(.brand) { color: var(--muted); }
.footer-grid a:not(.brand):hover { color: var(--text); }
.footer-grid .brand { margin-bottom: .5rem; }
.footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem; margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .9rem; }
.social { display: flex; gap: 1.2rem; }
.social a { color: var(--muted); }

/* Reveal on scroll */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* Responsive */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 860px) {
  .nav-toggle { display: block; }
  .nav-links { position: absolute; top: 70px; left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0; background: var(--bg); border-bottom: 1px solid var(--line); padding: .5rem 16px 1rem; display: none; }
  .nav-links.open { display: flex; }
  .nav-links a:not(.btn) { padding: .8rem 0; border-bottom: 1px solid var(--line); }
  .nav-links a.active { box-shadow: none; color: var(--accent); }
  .nav-links .btn { margin-top: 1rem; }
  .hero-inner, .split, .course-layout, .contact-layout { grid-template-columns: 1fr; }
  .hero-visual { order: -1; }
  .radar { width: min(240px, 60vw); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .enroll { position: static; }
}
@media (max-width: 600px) {
  .grid-2, .grid-3, .grid-4, .form-row, .footer-grid { grid-template-columns: 1fr; }
  .section { padding: 56px 0; }
  .hero { padding-top: 48px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}