/* =====================================================================
   MAGNETIZE MARKETING — Course Topic Ring Gallery
   Design system: Passion One (display) + Poppins (body)
   Magnetic Red #E63946 · Magnetic Blue #1D3FBF · black #111 · canvas #FAFAFA
   ===================================================================== */

/* ---- Fonts (Google CDN; page still works if slow) ---- */
@import url('https://fonts.googleapis.com/css2?family=Passion+One:wght@700;900&family=Poppins:wght@400;500;600;700&display=swap');

:root{
  --red:#E63946; --red-hover:#C62430;
  --blue:#1D3FBF;
  --black:#111111; --ink:#1A1A1A; --body:#2B2B2E; --muted:#6B6B70;
  --line:#D4D4D9; --line-soft:rgba(17,17,17,.12);
  --canvas:#FAFAFA; --paper:#F7F7F4; --white:#FFFFFF;
  --display:'Passion One',sans-serif;
  --font:'Poppins',sans-serif;
  --radius:2px;
}

*{box-sizing:border-box;margin:0;padding:0;}
html,body{height:100%;}
body{
  font-family:var(--font);
  color:var(--body);
  background:var(--canvas);
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a{color:var(--blue);text-decoration:none;}
a:hover{color:var(--red);}
img{display:block;max-width:100%;}
button{font-family:inherit;cursor:pointer;background:none;border:none;color:inherit;}

/* ===================== NAV ===================== */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:60;
  display:none!important;align-items:center;justify-content:space-between;
  gap:24px;padding:20px 36px;
  background:linear-gradient(to bottom, rgba(250,250,250,.92), rgba(250,250,250,0));
  opacity:0;transform:translateY(-12px);
  animation:fadeDown .8s .1s forwards cubic-bezier(.2,.7,.2,1);
}
.nav__brand{
  display:flex;align-items:center;gap:9px;
  font-family:var(--font);font-weight:700;font-size:16px;letter-spacing:.5px;
  color:var(--black);white-space:nowrap;
}
.nav__brand:hover{color:var(--black);}
.nav__brand-thin{font-weight:400;color:var(--muted);letter-spacing:1px;}
.nav__magnet{
  width:13px;height:13px;background:var(--red);border-radius:1px;
  box-shadow:3px 0 0 var(--white),3px 0 0 1px var(--black);
}
.nav__links{display:flex;gap:26px;}
.nav__link{
  position:relative;font-size:14px;font-weight:500;color:var(--ink);
  padding:2px 0;
}
.nav__link::after{
  content:"";position:absolute;left:0;bottom:-2px;height:1.5px;width:100%;
  background:var(--blue);transform:scaleX(0);transform-origin:left;
  transition:transform .35s cubic-bezier(.2,.7,.2,1);
}
.nav__link:hover{color:var(--black);}
.nav__link:hover::after{transform:scaleX(1);}
.nav__right{display:flex;align-items:center;gap:18px;}
.nav__lang{display:flex;align-items:center;gap:7px;font-size:13px;font-weight:500;}
.nav__lang-btn{color:var(--muted);}
.nav__lang-btn.is-active{color:var(--black);text-decoration:underline;text-underline-offset:3px;text-decoration-color:var(--blue);}
.nav__lang-sep{color:var(--line);}
.nav__burger{display:none;flex-direction:column;gap:5px;padding:6px;}
.nav__burger span{width:22px;height:2px;background:var(--black);transition:.3s;}

/* ===================== HERO ===================== */
.hero{
  position:relative;width:100%;min-height:100vh;overflow:hidden;
  background:var(--canvas);
}

.edge-btn{
  position:absolute;top:104px;z-index:40;
  font-size:13px;font-weight:600;letter-spacing:.3px;color:var(--black);
  padding-bottom:3px;border-bottom:1.5px solid var(--black);
  transition:color .25s,border-color .25s;
}
.edge-btn span{color:var(--red);font-weight:700;}
.edge-btn:hover{color:var(--red);border-color:var(--red);}
.edge-btn--left{left:36px;}
.edge-btn--right{right:36px;}

/* ---- category labels ---- */
.cat-layer{position:absolute;inset:0;z-index:210;pointer-events:none;}
.cat{
  position:absolute;pointer-events:auto;white-space:nowrap;
  font-size:12.5px;font-weight:600;color:var(--black);
  opacity:0;transform:translateY(6px);
  transition:opacity .5s,transform .5s,color .25s;
}
.cat--left{text-align:left;}
.cat--right{text-align:right;}
.cat.is-in{opacity:1;transform:translateY(0);}
.cat__label{position:relative;padding-bottom:2px;}
.cat__label::after{
  content:"";position:absolute;left:0;bottom:0;height:1.5px;width:100%;
  background:var(--blue);transform:scaleX(0);transform-origin:left;
  transition:transform .35s cubic-bezier(.2,.7,.2,1);
}
.cat:hover{color:var(--red);cursor:pointer;}
.cat:hover .cat__label::after{transform:scaleX(1);background:var(--red);}
.cat.is-active{color:var(--red);}
.cat.is-active .cat__label::after{transform:scaleX(1);background:var(--red);}
.cat__count{
  font-size:9px;font-weight:600;color:var(--muted);
  vertical-align:super;margin-left:3px;
}

/* ---- ring ---- */
.ring-stage{
  position:absolute;left:50%;top:71%;
  width:100%;height:440px;
  transform:translate(-50%,-50%);
  perspective:1200px;z-index:10;
  opacity:0;
  animation:ringIn 1.2s .35s forwards cubic-bezier(.2,.7,.2,1);
}
.ring{
  position:absolute;left:50%;top:50%;width:0;height:0;
  transform-style:preserve-3d;
}
.panel{
  position:absolute;left:0;top:0;
  width:42px;height:112px;margin:-56px 0 0 -21px;
  border-radius:var(--radius);overflow:hidden;
  background:#DDD;border:1px solid rgba(0,0,0,.18);
  box-shadow:0 8px 18px rgba(0,0,0,.10);
  will-change:transform,opacity;
  transition:box-shadow .3s, border-color .3s, filter .3s;
  cursor:pointer;
}
.panel img{width:100%;height:100%;object-fit:cover;pointer-events:none;
  transition:transform .5s cubic-bezier(.2,.7,.2,1),filter .3s;}
.panel__tint{
  position:absolute;inset:0;background:rgba(17,17,17,0);
  transition:background .3s;pointer-events:none;
}
.panel.is-hover{border-color:rgba(0,0,0,.35);box-shadow:0 14px 30px rgba(0,0,0,.20);}
.panel.is-hover img{transform:scale(1.08);}
.panel.is-active{border:2px solid var(--red);box-shadow:0 16px 34px rgba(230,57,70,.28);}

/* ---- center ---- */
.center{
  position:absolute;left:50%;top:30%;z-index:20;
  width:min(760px,88vw);transform:translate(-50%,-50%);
  text-align:center;pointer-events:none;
}
.center__default,.center__topic{
  transition:opacity .5s cubic-bezier(.2,.7,.2,1),transform .5s cubic-bezier(.2,.7,.2,1);
}
.center__topic{
  position:absolute;left:50%;top:0;transform:translate(-50%,8px);
  width:100%;opacity:0;pointer-events:none;
}
.center.is-topic .center__default{opacity:0;transform:translateY(-10px);}
.center.is-topic .center__topic{opacity:1;transform:translate(-50%,0);}

.center__headline{
  font-family:var(--display);font-weight:700;text-transform:uppercase;
  font-size:clamp(44px,6.4vw,86px);line-height:.98;letter-spacing:.5px;
  color:var(--black);max-width:720px;margin:0 auto;
  text-wrap:balance;
}
.center__sub{
  margin:22px auto 0;max-width:620px;
  font-size:clamp(15px,1.35vw,20px);line-height:1.5;color:var(--ink);
}
.center__sub strong{font-weight:600;color:var(--black);}

.center__img-wrap{
  position:relative;width:200px;height:132px;margin:0 auto 20px;
  border-radius:var(--radius);overflow:hidden;
  background:var(--paper);border:1px solid var(--line);
  box-shadow:0 12px 30px rgba(0,0,0,.14);
}
.center__img{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  opacity:0;transition:opacity .45s ease;
}
.center__img.is-shown{opacity:1;}
.center__title{
  font-family:var(--display);font-weight:700;text-transform:uppercase;
  font-size:clamp(26px,3vw,42px);line-height:1;letter-spacing:.5px;
  color:var(--black);max-width:640px;margin:0 auto;text-wrap:balance;
}
.center__meta{
  margin:14px auto 0;font-size:12px;font-weight:600;letter-spacing:1.2px;
  text-transform:uppercase;color:var(--blue);
}
.center__tags{
  display:flex;gap:8px;justify-content:center;margin-top:12px;flex-wrap:wrap;
}
.center__tag{
  font-size:11px;font-weight:500;letter-spacing:.4px;color:var(--muted);
  border:1px solid var(--line);border-radius:var(--radius);
  padding:4px 10px;background:var(--white);
}
.cta{
  pointer-events:auto;margin-top:22px;
  font-size:14px;font-weight:600;letter-spacing:.4px;color:var(--red);
  padding-bottom:3px;border-bottom:1.5px solid var(--red);
  opacity:0;transform:translateY(6px);transition:opacity .4s,transform .4s,color .25s;
}
.cta span{font-weight:700;}
.cta:hover{color:var(--red-hover);border-color:var(--red-hover);}
.center.is-locked .cta{opacity:1;transform:translateY(0);}
/* locked: lift the whole card above every ring panel */
.center.is-locked{z-index:80;}
/* locked: enlarge the center card into a portrait hero + reveal syllabus button */
.center.is-locked .center__img-wrap{
  width:min(300px,72vw);height:min(400px,52vh);margin-bottom:22px;
  box-shadow:0 22px 48px rgba(0,0,0,.22);
}

.hint{
  position:absolute;left:50%;bottom:24px;transform:translateX(-50%);z-index:20;
  font-size:11px;letter-spacing:4px;text-transform:uppercase;
  color:rgba(17,17,17,.35);white-space:nowrap;
  opacity:0;animation:fadeUp .8s 1.1s forwards;
}

/* ===================== CUSTOM CURSOR ===================== */
.cursor{
  position:fixed;top:0;left:0;z-index:90;pointer-events:none;
  width:8px;height:8px;border-radius:50%;background:var(--black);
  transform:translate(-50%,-50%);
  transition:width .25s,height .25s,background .25s,opacity .25s;
  opacity:0;mix-blend-mode:normal;
}
.cursor.is-on{opacity:1;}
.cursor.is-hot{width:34px;height:34px;background:rgba(230,57,70,.16);
  border:1px solid var(--red);}

/* ===================== GRID VIEW ===================== */
.grid-view{
  display:none;position:relative;z-index:70;
  min-height:100vh;background:var(--canvas);
  padding:110px 36px 80px;
}
.grid-view.is-open{display:block;}
.grid-view__head{
  display:flex;align-items:flex-end;justify-content:space-between;
  gap:24px;margin-bottom:40px;flex-wrap:wrap;
}
.grid-view__eyebrow{
  font-size:12px;font-weight:600;letter-spacing:1.4px;text-transform:uppercase;
  color:var(--blue);margin-bottom:8px;
}
.grid-view__title{
  font-family:var(--display);font-weight:700;text-transform:uppercase;
  font-size:clamp(40px,6vw,72px);line-height:.98;color:var(--black);letter-spacing:.5px;
}
.grid-view__units{display:flex;flex-direction:column;gap:56px;}

.unit-block__head{
  display:flex;align-items:baseline;gap:16px;
  padding-bottom:14px;margin-bottom:22px;border-bottom:1px solid var(--line);
}
.unit-block__num{
  font-family:var(--display);font-weight:700;font-size:44px;line-height:.8;
  color:var(--red);
}
.unit-block__name{
  font-family:var(--display);font-weight:700;text-transform:uppercase;
  font-size:24px;letter-spacing:.5px;color:var(--black);
}
.unit-block__count{
  margin-left:auto;font-size:12px;font-weight:500;color:var(--muted);
  letter-spacing:.4px;white-space:nowrap;
}
.unit-block__grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;
}
.tcard{
  position:relative;display:flex;flex-direction:column;
  border:1px solid var(--line);border-radius:var(--radius);
  background:var(--white);overflow:hidden;
  transition:border-color .25s,box-shadow .25s,transform .25s;
}
.tcard::before{
  content:"";position:absolute;top:0;left:0;width:14px;height:14px;
  background:var(--red);z-index:2;
}
.tcard:hover{border-color:var(--black);box-shadow:0 12px 26px rgba(0,0,0,.10);transform:translateY(-3px);}
.tcard__img{width:100%;aspect-ratio:16/10;object-fit:cover;background:var(--paper);}
.tcard__body{padding:16px 16px 18px;display:flex;flex-direction:column;gap:10px;flex:1;}
.tcard__title{font-size:16px;font-weight:600;color:var(--black);line-height:1.3;}
.tcard__foot{margin-top:auto;display:flex;align-items:center;gap:8px;flex-wrap:wrap;}
.tcard__level{font-size:11px;font-weight:600;letter-spacing:.4px;color:var(--blue);text-transform:uppercase;}
.tcard__dot{width:3px;height:3px;border-radius:50%;background:var(--line);}
.tcard__format{font-size:11px;font-weight:500;color:var(--muted);}

/* ===================== FILTER OVERLAY ===================== */
.filter{
  position:fixed;inset:0;z-index:300;display:none;
  justify-content:flex-end;
  background:rgba(17,17,17,.32);
  opacity:0;transition:opacity .35s ease;
}
.filter.is-open{display:flex;opacity:1;}
.filter__panel{
  width:min(420px,92vw);height:100%;background:var(--white);
  border-left:1px solid var(--line);
  display:flex;flex-direction:column;
  transform:translateX(30px);transition:transform .4s cubic-bezier(.2,.7,.2,1);
  padding:32px 32px 24px;
}
.filter.is-open .filter__panel{transform:translateX(0);}
.filter__head{display:flex;align-items:center;justify-content:space-between;margin-bottom:26px;}
.filter__title{
  font-family:var(--display);font-weight:700;text-transform:uppercase;
  font-size:32px;letter-spacing:.5px;color:var(--black);
}
.filter__close{font-size:13px;font-weight:600;color:var(--muted);}
.filter__close:hover{color:var(--red);}
.filter__groups{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:28px;}
.fgroup__label{
  font-size:12px;font-weight:600;letter-spacing:1.2px;text-transform:uppercase;
  color:var(--muted);margin-bottom:12px;
}
.fgroup__opts{display:flex;flex-wrap:wrap;gap:8px;}
.fchip{
  font-size:13px;font-weight:500;color:var(--ink);
  border:1px solid var(--line);border-radius:var(--radius);
  padding:7px 13px;background:var(--white);transition:.2s;
}
.fchip:hover{border-color:var(--black);}
.fchip.is-on{background:var(--black);color:var(--white);border-color:var(--black);}
.filter__foot{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding-top:20px;margin-top:20px;border-top:1px solid var(--line);
}
.filter__clear{font-size:13px;font-weight:600;color:var(--muted);text-decoration:underline;text-underline-offset:3px;}
.filter__clear:hover{color:var(--red);}
.filter__apply{
  font-size:14px;font-weight:600;color:var(--white);background:var(--red);
  border-radius:var(--radius);padding:12px 22px;transition:background .2s;
}
.filter__apply:hover{background:var(--red-hover);}

/* ===================== ANIMATIONS ===================== */
@keyframes fadeDown{to{opacity:1;transform:translateY(0);}}
@keyframes fadeUp{to{opacity:1;}}
@keyframes ringIn{
  0%{opacity:0;transform:translate(-50%,-50%) scale(.86);}
  100%{opacity:1;transform:translate(-50%,-50%) scale(1);}
}

/* ===================== RESPONSIVE ===================== */
@media (max-width:1100px){
  .nav__links{gap:18px;}
  .cat{font-size:11.5px;}
}
@media (max-width:900px){
  .nav{padding:16px 20px;}
  .nav__links{display:none;}
  .nav__burger{display:flex;}
  .edge-btn--left{left:20px;}
  .edge-btn--right{right:20px;}
  .cat-layer{display:none;}
  .cursor{display:none;}
}
@media (max-width:768px){
  .center{top:26%;}
  .center__headline{font-size:clamp(38px,11vw,52px);}
  .ring-stage{top:74%;height:360px;}
  .hint{font-size:10px;letter-spacing:3px;}
  /* mobile category scroll row */
  .cat-mobile{
    display:flex;gap:10px;overflow-x:auto;
    position:absolute;left:0;right:0;bottom:70px;z-index:30;
    padding:0 20px;-webkit-overflow-scrolling:touch;scrollbar-width:none;
  }
  .cat-mobile::-webkit-scrollbar{display:none;}
  .cat-mobile .cat{
    position:static;opacity:1;transform:none;flex:0 0 auto;
    padding:6px 0;
  }
  .grid-view{padding:96px 20px 64px;}
  .unit-block__grid{grid-template-columns:repeat(auto-fill,minmax(180px,1fr));}
}
@media (min-width:769px){
  .cat-mobile{display:none;}
}
@media (max-width:480px){
  .center__headline{font-size:clamp(34px,12vw,44px);}
  .center__img-wrap{width:160px;height:106px;}
}

@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001s !important;transition-duration:.05s !important;}
}