/* =========================================================
   Brilliant 아카데미 — LMS Course Catalog Template
   Pure HTML/CSS/JS. Self-contained. No external assets.
   ========================================================= */

/* ---------- Design Tokens ---------- */
:root{
  --indigo:#4f46e5;
  --indigo-600:#4338ca;
  --indigo-050:#eef2ff;
  --sky:#38bdf8;
  --sky-050:#e0f2fe;
  --ink:#1e2233;
  --ink-soft:#4b5168;
  --muted:#6b7280;
  --line:#e7e9f3;
  --soft:#f6f7fb;
  --white:#ffffff;
  --star:#f7b500;

  --grad:linear-gradient(135deg,#4f46e5 0%,#38bdf8 100%);
  --grad-soft:linear-gradient(135deg,#eef2ff 0%,#e0f2fe 100%);

  --shadow-sm:0 2px 8px rgba(30,34,51,.06);
  --shadow:0 12px 30px rgba(48,54,110,.12);
  --shadow-lg:0 24px 60px rgba(48,54,110,.18);

  --r-sm:10px;
  --r:16px;
  --r-lg:24px;
  --r-pill:999px;

  --wrap:1180px;
  --gutter:clamp(18px,4vw,48px);

  --step-h1:clamp(1.9rem,1.2rem + 3.2vw,3.4rem);
  --step-h2:clamp(1.5rem,1.05rem + 2vw,2.4rem);
  --step-h3:clamp(1.15rem,.98rem + .7vw,1.4rem);
  --step-lead:clamp(1rem,.95rem + .4vw,1.18rem);

  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  font-family:"Pretendard","Apple SD Gothic Neo","Malgun Gothic",
    system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  color:var(--ink);
  background:var(--white);
  line-height:1.6;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;border:none;background:none;color:inherit}
ul{list-style:none}
input,select,textarea{font:inherit;color:inherit}

:focus-visible{outline:3px solid var(--sky);outline-offset:2px;border-radius:6px}

/* ---------- Layout helpers ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(48px,7vw,96px)}
.section--soft{background:var(--soft)}
.section-head{max-width:640px;margin-bottom:clamp(28px,4vw,44px)}
.section-head.center{margin-inline:auto;text-align:center}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:.82rem;font-weight:700;letter-spacing:.04em;
  color:var(--indigo);background:var(--indigo-050);
  padding:6px 14px;border-radius:var(--r-pill);margin-bottom:14px;
}
h1,h2,h3{line-height:1.18;letter-spacing:-.02em;color:var(--ink)}
h1{font-size:var(--step-h1);font-weight:800}
h2{font-size:var(--step-h2);font-weight:800}
h3{font-size:var(--step-h3);font-weight:700}
.lead{font-size:var(--step-lead);color:var(--ink-soft);margin-top:14px}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-weight:700;font-size:.98rem;line-height:1;
  padding:14px 24px;border-radius:var(--r-pill);
  transition:transform .25s var(--ease),box-shadow .25s var(--ease),background .25s;
  white-space:nowrap;
}
.btn svg{width:18px;height:18px}
.btn--primary{background:var(--grad);color:#fff;box-shadow:0 10px 22px rgba(79,70,229,.32)}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 16px 30px rgba(79,70,229,.42)}
.btn--ghost{background:var(--white);color:var(--indigo);border:1.5px solid var(--line);box-shadow:var(--shadow-sm)}
.btn--ghost:hover{transform:translateY(-2px);border-color:var(--indigo);box-shadow:var(--shadow)}
.btn--light{background:rgba(255,255,255,.16);color:#fff;border:1.5px solid rgba(255,255,255,.35)}
.btn--light:hover{background:rgba(255,255,255,.26)}
.btn--block{width:100%}

/* ---------- Header / Nav ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.85);
  backdrop-filter:saturate(160%) blur(12px);
  border-bottom:1px solid transparent;
  transition:box-shadow .3s,border-color .3s;
}
.site-header.scrolled{box-shadow:var(--shadow-sm);border-bottom-color:var(--line)}
.nav{
  display:flex;align-items:center;gap:18px;
  min-height:72px;
}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:800;font-size:1.15rem;flex-shrink:0}
.brand .logo{width:38px;height:38px;flex-shrink:0}
.brand small{display:block;font-size:.66rem;font-weight:600;color:var(--muted);letter-spacing:.02em}

.nav-search{
  display:flex;align-items:center;gap:8px;flex:1;max-width:340px;
  background:var(--soft);border:1.5px solid var(--line);
  border-radius:var(--r-pill);padding:9px 16px;margin-left:6px;
  transition:border-color .2s,box-shadow .2s;
}
.nav-search:focus-within{border-color:var(--indigo);box-shadow:0 0 0 3px var(--indigo-050)}
.nav-search svg{width:18px;height:18px;color:var(--muted);flex-shrink:0}
.nav-search input{border:none;background:none;outline:none;width:100%;font-size:.92rem}

.nav-links{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav-links a{
  padding:10px 14px;border-radius:var(--r-pill);
  font-weight:600;font-size:.96rem;color:var(--ink-soft);
  transition:color .2s,background .2s;
}
.nav-links a:hover,.nav-links a[aria-current="page"]{color:var(--indigo);background:var(--indigo-050)}
.nav-cta{margin-left:6px}
.nav-cta .btn{padding:12px 22px}

.hamburger{
  display:none;width:44px;height:44px;border-radius:12px;
  align-items:center;justify-content:center;flex-shrink:0;
  border:1.5px solid var(--line);background:var(--white);margin-left:auto;
}
.hamburger span{position:relative;width:20px;height:2px;background:var(--ink);border-radius:2px;transition:.3s}
.hamburger span::before,.hamburger span::after{
  content:"";position:absolute;left:0;width:20px;height:2px;background:var(--ink);border-radius:2px;transition:.3s;
}
.hamburger span::before{top:-6px}
.hamburger span::after{top:6px}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;background:var(--grad-soft)}
.hero::before{
  content:"";position:absolute;top:-160px;right:-140px;
  width:420px;height:420px;border-radius:50%;
  background:radial-gradient(circle,rgba(56,189,248,.28),transparent 68%);
  pointer-events:none;
}
.hero .wrap{
  position:relative;display:grid;gap:clamp(32px,5vw,56px);
  grid-template-columns:1.05fr .95fr;align-items:center;
  padding-block:clamp(48px,7vw,90px);
}
.hero-copy .eyebrow{background:#fff}
.hero h1 .hl{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-search{
  display:flex;align-items:center;gap:8px;margin-top:26px;
  background:#fff;border-radius:var(--r-pill);padding:8px 8px 8px 18px;
  box-shadow:var(--shadow);max-width:460px;
}
.hero-search svg{width:20px;height:20px;color:var(--muted);flex-shrink:0}
.hero-search input{flex:1;border:none;outline:none;background:none;font-size:1rem;min-width:0}
.hero-search .btn{flex-shrink:0}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
.hero-trust{display:flex;flex-wrap:wrap;gap:20px;margin-top:26px;color:var(--ink-soft);font-size:.9rem}
.hero-trust b{color:var(--ink)}

.hero-art{position:relative}
.hero-art svg{width:100%;height:auto}
.floaty{animation:floaty 6s ease-in-out infinite}
.floaty.d1{animation-delay:-1.5s}
.floaty.d2{animation-delay:-3s}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-14px)}}

/* ---------- Category chips ---------- */
.chips{display:flex;flex-wrap:wrap;gap:10px}
.chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 18px;border-radius:var(--r-pill);
  background:var(--white);border:1.5px solid var(--line);
  font-weight:600;font-size:.92rem;color:var(--ink-soft);
  transition:.2s;
}
.chip svg{width:18px;height:18px;color:var(--indigo)}
.chip:hover{border-color:var(--indigo);color:var(--indigo);transform:translateY(-2px);box-shadow:var(--shadow-sm)}
.chip.is-active{background:var(--grad);color:#fff;border-color:transparent}
.chip.is-active svg{color:#fff}

/* ---------- Course grid ---------- */
.course-grid{
  display:grid;gap:clamp(18px,2.4vw,26px);
  grid-template-columns:repeat(auto-fill,minmax(270px,1fr));
}
.course-card{
  background:var(--white);border:1px solid var(--line);
  border-radius:var(--r-lg);overflow:hidden;
  display:flex;flex-direction:column;
  box-shadow:var(--shadow-sm);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease);
}
.course-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.course-thumb{position:relative;aspect-ratio:16/10;overflow:hidden}
.course-thumb svg{width:100%;height:100%;object-fit:cover}
.course-tag{
  position:absolute;top:12px;left:12px;
  background:rgba(255,255,255,.92);color:var(--indigo);
  font-size:.74rem;font-weight:700;padding:5px 12px;border-radius:var(--r-pill);
}
.course-lvl{
  position:absolute;top:12px;right:12px;
  background:rgba(30,34,51,.72);color:#fff;
  font-size:.72rem;font-weight:600;padding:5px 11px;border-radius:var(--r-pill);
}
.course-body{padding:18px 18px 20px;display:flex;flex-direction:column;gap:10px;flex:1}
.course-body h3{font-size:1.06rem;line-height:1.35}
.course-mentor{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:.86rem}
.course-mentor .ava{width:26px;height:26px;border-radius:50%;flex-shrink:0}
.course-meta{display:flex;align-items:center;gap:12px;flex-wrap:wrap;font-size:.84rem;color:var(--ink-soft);margin-top:auto}
.stars{display:inline-flex;align-items:center;gap:3px;color:var(--star);font-weight:700}
.stars svg{width:15px;height:15px}
.stars .num{color:var(--ink);margin-left:2px}
.course-foot{
  display:flex;align-items:center;justify-content:space-between;
  padding-top:14px;margin-top:4px;border-top:1px solid var(--line);
}
.price{font-weight:800;font-size:1.12rem;color:var(--indigo)}
.price .free{color:#16a34a}
.price s{color:var(--muted);font-weight:500;font-size:.82rem;margin-right:6px}
.course-foot .go{
  width:38px;height:38px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;
  background:var(--indigo-050);color:var(--indigo);transition:.2s;
}
.course-card:hover .go{background:var(--grad);color:#fff}
.course-foot .go svg{width:18px;height:18px}

/* ---------- Features ---------- */
.feature-grid{
  display:grid;gap:clamp(16px,2.4vw,24px);
  grid-template-columns:repeat(auto-fit,minmax(230px,1fr));
}
.feature{
  background:var(--white);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:28px 24px;box-shadow:var(--shadow-sm);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease);
}
.feature:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.feature .ic{
  width:56px;height:56px;border-radius:16px;display:grid;place-items:center;
  background:var(--grad-soft);margin-bottom:16px;
}
.feature .ic svg{width:30px;height:30px;color:var(--indigo)}
.feature h3{margin-bottom:8px}
.feature p{color:var(--ink-soft);font-size:.95rem}

/* ---------- Stats ---------- */
.stats{
  display:grid;gap:clamp(16px,2.4vw,24px);
  grid-template-columns:repeat(auto-fit,minmax(180px,1fr));
}
.stat{
  text-align:center;padding:30px 18px;border-radius:var(--r-lg);
  background:var(--white);border:1px solid var(--line);box-shadow:var(--shadow-sm);
}
.stat .val{font-size:clamp(2rem,1.4rem + 2.4vw,3rem);font-weight:800;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;line-height:1}
.stat .val .suffix{-webkit-text-fill-color:currentColor;color:var(--indigo)}
.stat .lbl{margin-top:10px;color:var(--ink-soft);font-weight:600;font-size:.95rem}

/* ---------- Progress ring row ---------- */
.rings{display:grid;gap:24px;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));margin-top:36px}
.ring{text-align:center}
.ring svg{width:120px;height:120px;margin-inline:auto}
.ring .track{fill:none;stroke:var(--line);stroke-width:10}
.ring .bar{fill:none;stroke:url(#ringgrad);stroke-width:10;stroke-linecap:round;
  transform:rotate(-90deg);transform-origin:60px 60px;
  stroke-dasharray:314;stroke-dashoffset:314;transition:stroke-dashoffset 1.4s var(--ease)}
.ring.in .bar{stroke-dashoffset:var(--off)}
.ring .pct{font-size:1.4rem;font-weight:800;fill:var(--ink)}
.ring p{margin-top:10px;font-weight:600;color:var(--ink-soft)}

/* ---------- Mentors row ---------- */
.mentor-grid{
  display:grid;gap:clamp(16px,2.4vw,24px);
  grid-template-columns:repeat(auto-fill,minmax(220px,1fr));
}
.mentor-card{
  background:var(--white);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:26px 22px;text-align:center;box-shadow:var(--shadow-sm);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease);
}
.mentor-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.mentor-card .ava{width:92px;height:92px;margin-inline:auto;border-radius:50%;overflow:hidden;
  box-shadow:0 8px 20px rgba(79,70,229,.22)}
.mentor-card h3{margin-top:16px;font-size:1.1rem}
.mentor-card .field{color:var(--indigo);font-weight:600;font-size:.9rem;margin-top:4px}
.mentor-card .m-meta{display:flex;justify-content:center;gap:14px;margin-top:12px;
  color:var(--ink-soft);font-size:.85rem}
.mentor-card .tags{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;margin-top:14px}
.mentor-card .tags span{background:var(--soft);border:1px solid var(--line);border-radius:var(--r-pill);
  padding:5px 11px;font-size:.76rem;color:var(--ink-soft)}

/* Featured mentor split */
.mentor-featured{
  display:grid;gap:clamp(28px,4vw,48px);grid-template-columns:.9fr 1.1fr;align-items:center;
  background:var(--grad);border-radius:var(--r-lg);padding:clamp(28px,4vw,52px);color:#fff;overflow:hidden;
}
.mentor-featured .m-photo{width:100%;max-width:280px;margin-inline:auto}
.mentor-featured h2{color:#fff}
.mentor-featured .role{font-weight:700;color:var(--sky-050);margin-top:6px}
.mentor-featured p{color:rgba(255,255,255,.9);margin-top:14px}
.mentor-featured .m-stats{display:flex;flex-wrap:wrap;gap:26px;margin-top:22px}
.mentor-featured .m-stats b{display:block;font-size:1.6rem}
.mentor-featured .m-stats span{font-size:.85rem;color:rgba(255,255,255,.8)}

/* ---------- Reviews ---------- */
.review-grid{
  display:grid;gap:clamp(16px,2.4vw,24px);
  grid-template-columns:repeat(auto-fill,minmax(280px,1fr));
}
.review{
  background:var(--white);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:26px 24px;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;gap:14px;
}
.review .stars svg{width:16px;height:16px}
.review q{font-size:1rem;color:var(--ink);line-height:1.6;quotes:none}
.review .who{display:flex;align-items:center;gap:12px;margin-top:auto}
.review .who .ava{width:44px;height:44px;border-radius:50%;flex-shrink:0}
.review .who b{font-size:.95rem}
.review .who span{display:block;color:var(--muted);font-size:.82rem}

/* ---------- CTA band ---------- */
.cta-band{position:relative;overflow:hidden;background:var(--grad);color:#fff;text-align:center;border-radius:var(--r-lg)}
.cta-band::before{content:"";position:absolute;inset:0;
  background:radial-gradient(circle at 20% 20%,rgba(255,255,255,.18),transparent 40%),
             radial-gradient(circle at 85% 80%,rgba(255,255,255,.14),transparent 42%);pointer-events:none}
.cta-band .inner{position:relative;padding:clamp(40px,6vw,72px) var(--gutter)}
.cta-band h2{color:#fff}
.cta-band p{color:rgba(255,255,255,.9);max-width:520px;margin:14px auto 0}
.cta-band .hero-actions{justify-content:center;margin-top:26px}

/* ---------- Page hero (subpages) ---------- */
.page-hero{background:var(--grad-soft);position:relative;overflow:hidden}
.page-hero::before{content:"";position:absolute;top:-120px;left:-100px;width:340px;height:340px;border-radius:50%;
  background:radial-gradient(circle,rgba(79,70,229,.16),transparent 68%);pointer-events:none}
.page-hero .wrap{position:relative;padding-block:clamp(44px,6vw,80px);text-align:center;max-width:760px}
.crumbs{font-size:.85rem;color:var(--muted);margin-bottom:14px}
.crumbs a:hover{color:var(--indigo)}

/* ---------- Filter bar ---------- */
.filter-bar{display:flex;flex-wrap:wrap;gap:22px;justify-content:space-between;align-items:flex-end;margin-bottom:28px}
.filter-group{display:flex;flex-direction:column;gap:10px}
.filter-group .lbl{font-size:.82rem;font-weight:700;color:var(--muted);letter-spacing:.03em}
.no-result{display:none;text-align:center;padding:50px 20px;color:var(--muted);grid-column:1/-1}
.no-result.show{display:block}

/* ---------- FAQ ---------- */
.faq{max-width:760px;margin-inline:auto;display:flex;flex-direction:column;gap:12px}
.faq details{
  background:var(--white);border:1px solid var(--line);border-radius:var(--r);
  padding:6px 22px;box-shadow:var(--shadow-sm);
}
.faq summary{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:16px 0;font-weight:700;cursor:pointer;list-style:none;font-size:1rem;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary .mk{width:26px;height:26px;flex-shrink:0;border-radius:50%;background:var(--indigo-050);
  color:var(--indigo);display:grid;place-items:center;transition:.3s;font-weight:800}
.faq details[open] summary .mk{transform:rotate(45deg);background:var(--grad);color:#fff}
.faq details p{padding:0 0 18px;color:var(--ink-soft)}

/* ---------- Forms (enroll) ---------- */
.enroll-grid{display:grid;gap:clamp(28px,4vw,48px);grid-template-columns:1.1fr .9fr;align-items:start}
.form-card{background:var(--white);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:clamp(24px,3vw,36px);box-shadow:var(--shadow)}
.field{margin-bottom:18px}
.field label{display:block;font-weight:600;font-size:.92rem;margin-bottom:8px}
.field label .req{color:var(--indigo)}
.field input,.field select,.field textarea{
  width:100%;padding:13px 15px;border:1.5px solid var(--line);border-radius:var(--r-sm);
  background:var(--soft);transition:border-color .2s,box-shadow .2s;
}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none;border-color:var(--indigo);background:#fff;box-shadow:0 0 0 3px var(--indigo-050)}
.field textarea{resize:vertical;min-height:120px}
.field.invalid input,.field.invalid select,.field.invalid textarea{border-color:#ef4444;background:#fef2f2}
.err{display:none;color:#ef4444;font-size:.82rem;margin-top:6px}
.field.invalid .err{display:block}
.form-success{
  display:none;text-align:center;padding:40px 24px;background:var(--grad-soft);
  border-radius:var(--r-lg);border:1px solid var(--line);
}
.form-success.show{display:block;animation:pop .4s var(--ease)}
.form-success svg{width:64px;height:64px;margin-inline:auto 16px;margin-bottom:12px}
@keyframes pop{from{opacity:0;transform:scale(.94)}to{opacity:1;transform:scale(1)}}

.info-tiles{display:grid;gap:16px}
.info-tile{display:flex;gap:14px;align-items:flex-start;background:var(--white);
  border:1px solid var(--line);border-radius:var(--r);padding:18px 20px;box-shadow:var(--shadow-sm)}
.info-tile .ic{width:44px;height:44px;flex-shrink:0;border-radius:12px;display:grid;place-items:center;
  background:var(--grad-soft)}
.info-tile .ic svg{width:24px;height:24px;color:var(--indigo)}
.info-tile b{display:block;font-size:.95rem}
.info-tile span{color:var(--ink-soft);font-size:.9rem}
.map-card{margin-top:16px;border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--shadow-sm)}
.map-card svg{width:100%;height:auto;display:block}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink);color:#c9cde0;padding-block:clamp(44px,6vw,68px) 28px}
.footer-grid{display:grid;gap:clamp(24px,4vw,44px);grid-template-columns:1.4fr 1fr 1fr 1fr}
.site-footer .brand{color:#fff}
.site-footer .brand small{color:#8b90aa}
.footer-about{margin-top:16px;font-size:.9rem;color:#9aa0bd;max-width:280px}
.footer-col h4{color:#fff;font-size:.95rem;margin-bottom:14px}
.footer-col a{display:block;padding:6px 0;font-size:.9rem;color:#9aa0bd;transition:color .2s}
.footer-col a:hover{color:var(--sky)}
.footer-bottom{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;
  margin-top:36px;padding-top:24px;border-top:1px solid rgba(255,255,255,.1);
  font-size:.85rem;color:#8b90aa}
.socials{display:flex;gap:10px}
.socials a{width:38px;height:38px;border-radius:50%;display:grid;place-items:center;
  background:rgba(255,255,255,.08);transition:.2s}
.socials a:hover{background:var(--indigo)}
.socials svg{width:18px;height:18px}

/* ---------- Reveal on scroll ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.08s}
.reveal.d2{transition-delay:.16s}
.reveal.d3{transition-delay:.24s}

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width:960px){
  .hero .wrap{grid-template-columns:1fr;text-align:center}
  .hero-copy .eyebrow{margin-inline:auto}
  .hero-search,.hero-actions{margin-inline:auto}
  .hero-actions,.hero-trust{justify-content:center}
  .hero-art{max-width:460px;margin-inline:auto;order:-1}
  .mentor-featured{grid-template-columns:1fr;text-align:center}
  .mentor-featured .m-stats{justify-content:center}
  .enroll-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}

  /* --- Mobile nav --- */
  .nav-search{display:none}
  .hamburger{display:inline-flex}
  .nav-links,.nav-cta{
    position:absolute;left:0;right:0;top:100%;
  }
  .nav-links{
    flex-direction:column;align-items:stretch;gap:6px;
    background:#fff;padding:76px var(--gutter) 16px;margin:0;
    box-shadow:var(--shadow);
    opacity:0;visibility:hidden;pointer-events:none;
    transform:translateY(-10px);
    transition:opacity .28s var(--ease),transform .28s var(--ease),visibility .28s;
  }
  .nav-links a{padding:14px 16px;font-size:1.02rem;border-radius:12px}
  .nav-cta{
    top:calc(100% + 12px);z-index:2;
    background:transparent;padding:4px var(--gutter);
    box-shadow:none;
    opacity:0;visibility:hidden;pointer-events:none;
    transform:translateY(-10px);margin:0;
    transition:opacity .28s var(--ease),transform .28s var(--ease),visibility .28s;
  }
  .nav-cta .btn{width:100%}
  body.nav-open .nav-links,
  body.nav-open .nav-cta{opacity:1;visibility:visible;pointer-events:auto;transform:none}
  body.nav-open .hamburger span{background:transparent}
  body.nav-open .hamburger span::before{top:0;transform:rotate(45deg)}
  body.nav-open .hamburger span::after{top:0;transform:rotate(-45deg)}
}

@media (max-width:640px){
  .course-grid{grid-template-columns:repeat(auto-fill,minmax(100%,1fr))}
  .filter-bar{flex-direction:column;align-items:stretch}
  .footer-grid{grid-template-columns:1fr}
  .hero-search{padding:6px 6px 6px 14px;gap:6px}
  .hero-search input{font-size:.95rem;padding:6px 2px}
  .hero-search .btn{padding:12px 16px;font-size:.9rem}
  .footer-bottom{flex-direction:column;text-align:center;align-items:center}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none !important;transition:none !important;scroll-behavior:auto !important}
  .reveal{opacity:1;transform:none}
  .ring .bar{stroke-dashoffset:var(--off)}
}