/* ==========================================================================
   Madras Mathematics Department — static stylesheet
   Change the palette here: every colour on the site derives from these vars.
   ========================================================================== */

:root{
  --brand-50:#eef7ff;  --brand-100:#d9edff; --brand-200:#bce0ff; --brand-300:#8ecdff;
  --brand-400:#59b0ff; --brand-500:#338ffb; --brand-600:#1d70f0; --brand-700:#1559dd;
  --brand-800:#1848b3; --brand-900:#19408d; --brand-950:#142856;
  --ink:#12263f; --ink-soft:#4b5f7a; --ink-mute:#7b8ca6;
  --line:#dbeafe; --paper:#ffffff; --tint:#f5fbff;
  --shadow-sm:0 1px 2px rgba(20,40,86,.06), 0 4px 14px -6px rgba(29,112,240,.18);
  --shadow-md:0 12px 32px -12px rgba(20,40,86,.22);
  --shadow-lg:0 32px 70px -24px rgba(29,112,240,.35);
  --font-body:"Inter",system-ui,-apple-system,"Segoe UI",Helvetica,Arial,sans-serif;
  --font-display:"Plus Jakarta Sans","Inter",system-ui,sans-serif;
  --font-math:"Cambria Math","STIX Two Math","Times New Roman",serif;
  --r:20px; --r-lg:28px;
  --ease:cubic-bezier(.22,1,.36,1);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:112px}
body{margin:0;font-family:var(--font-body);font-size:16px;line-height:1.6;color:var(--ink);background:var(--paper);-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
h1,h2,h3,h4{font-family:var(--font-display);line-height:1.12;letter-spacing:-.02em;margin:0;color:var(--ink)}
h1{font-size:clamp(2.4rem,5.4vw,4.1rem);font-weight:800}
h2{font-size:clamp(1.75rem,3.4vw,2.75rem);font-weight:800}
h3{font-size:1.15rem;font-weight:700}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:var(--brand-700);text-decoration:none}
a:hover{color:var(--brand-900)}
address{font-style:normal}
:focus-visible{outline:2px solid var(--brand-500);outline-offset:3px;border-radius:6px}
::selection{background:var(--brand-200);color:var(--brand-950)}

.container{width:100%;max-width:1200px;margin-inline:auto;padding-inline:clamp(1.15rem,4vw,2.5rem)}
.math{font-family:var(--font-math);font-style:italic}
.hl{background:linear-gradient(120deg,var(--brand-700),var(--brand-500) 55%,var(--brand-300));-webkit-background-clip:text;background-clip:text;color:transparent}
.hl--light{background:linear-gradient(120deg,#fff,var(--brand-200));-webkit-background-clip:text;background-clip:text;color:transparent}

/* ── utilities ───────────────────────────────────────────────────────── */
.skip{position:absolute;left:-9999px;top:0;z-index:200;background:var(--brand-600);color:#fff;padding:.7rem 1.2rem;border-radius:0 0 12px 0}
.skip:focus{left:0}
.eyebrow{display:inline-flex;align-items:center;gap:.5rem;border:1px solid var(--brand-200);background:var(--brand-50);color:var(--brand-700);border-radius:999px;padding:.38rem .85rem;font-size:.7rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase}
.eyebrow--light{border-color:rgba(255,255,255,.22);background:rgba(255,255,255,.1);color:var(--brand-100)}
.kicker{font-size:.7rem;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:var(--brand-600)}
.kicker--light{color:var(--brand-300)}
.lede{margin-top:1.4rem;font-size:clamp(1.05rem,1.6vw,1.25rem);color:var(--ink-soft);max-width:34rem}
.prose{margin-top:1.2rem;font-size:1.06rem;color:var(--ink-soft);max-width:44rem}

.section{padding:clamp(3.5rem,7vw,6.5rem) 0}
.section--tight{padding:clamp(2.75rem,5vw,4.5rem) 0}
.section--tint{background:linear-gradient(180deg,#fff,var(--tint) 45%,#fff)}
.section--dark{position:relative;overflow:hidden;background:var(--brand-950);color:#eaf4ff}
.section--dark h2,.section--dark h3{color:#fff}
.section--dark .section__desc{color:rgba(214,234,255,.78)}
.section--dark a{color:var(--brand-200)}
.section__head{max-width:46rem;margin-bottom:clamp(2.25rem,4vw,3.5rem)}
.section__head:not(.section__head--left){margin-inline:auto;text-align:center}
.section__head h2{margin-top:.9rem}
.section__desc{margin-top:1rem;color:var(--ink-soft)}
.section__desc--light{color:rgba(214,234,255,.8)}

/* ── buttons & chips ─────────────────────────────────────────────────── */
.btn{display:inline-flex;align-items:center;gap:.5rem;border-radius:999px;font-weight:600;font-size:.95rem;padding:.8rem 1.5rem;border:1px solid transparent;cursor:pointer;transition:transform .3s var(--ease),box-shadow .3s var(--ease),background .3s,color .3s,border-color .3s}
.btn:hover{transform:translateY(-2px)}
.btn--sm{padding:.5rem 1rem;font-size:.85rem}
.btn--lg{padding:.95rem 1.85rem;font-size:1rem}
.btn--primary{background:linear-gradient(120deg,var(--brand-600),var(--brand-500));color:#fff;box-shadow:0 12px 26px -10px rgba(29,112,240,.6)}
.btn--primary:hover{color:#fff;box-shadow:0 18px 34px -10px rgba(29,112,240,.7)}
.btn--outline{border-color:var(--brand-200);background:#fff;color:var(--brand-800)}
.btn--outline:hover{background:var(--brand-50);border-color:var(--brand-300);color:var(--brand-900)}
.btn--ghost{background:var(--brand-50);color:var(--brand-800)}
.btn--ghost:hover{background:var(--brand-100);color:var(--brand-900)}
.btn--white{background:#fff;color:var(--brand-700);box-shadow:0 16px 30px -12px rgba(20,40,86,.4)}
.btn--white:hover{color:var(--brand-800);background:#f2f9ff}
.btn--outlineLight{border-color:rgba(255,255,255,.4);background:rgba(255,255,255,.1);color:#fff}
.btn--outlineLight:hover{background:rgba(255,255,255,.2);color:#fff}

.chip{display:inline-flex;align-items:center;gap:.4rem;border-radius:999px;background:var(--brand-50);color:var(--brand-800);border:1px solid var(--brand-100);padding:.25rem .7rem;font-size:.72rem;font-weight:600;white-space:nowrap}
.chip--solid{background:#fff;box-shadow:var(--shadow-sm);border-color:var(--brand-100);color:var(--ink);font-size:.82rem;padding:.4rem .85rem}
.chip--prelim{background:#fffbeb;color:#92600a;border-color:#fde68a}
.chip--exam{background:#fff1f2;color:#9f1239;border-color:#fecdd3}
.chip--parents{background:#ecfdf5;color:#065f46;border-color:#a7f3d0}
.chip--assessment{background:var(--brand-50);color:var(--brand-800);border-color:var(--brand-200)}
.chip--info{background:#f1f5f9;color:#475569;border-color:#e2e8f0}
.chips{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1.4rem}
.dot{width:.5rem;height:.5rem;border-radius:999px;background:var(--brand-500);flex:none}
.dot--prelim{background:#f59e0b}.dot--exam{background:#e11d48}.dot--parents{background:#10b981}.dot--assessment{background:var(--brand-500)}.dot--info{background:#cbd5e1}

/* ── header / nav ────────────────────────────────────────────────────── */
.header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.82);backdrop-filter:blur(18px) saturate(160%);-webkit-backdrop-filter:blur(18px) saturate(160%);border-bottom:1px solid rgba(219,234,254,.9);transition:box-shadow .3s}
.header.is-stuck{box-shadow:0 10px 30px -18px rgba(29,112,240,.5)}
.header__inner{display:flex;align-items:center;gap:1rem;min-height:72px}
.brand{display:inline-flex;align-items:center;gap:.7rem;color:var(--ink)}
.brand:hover{color:var(--ink)}
.brand__mark{display:grid;place-items:center;width:40px;height:40px;border-radius:12px;background:linear-gradient(135deg,var(--brand-400),var(--brand-700));color:#fff;font-family:var(--font-display);font-weight:800;font-size:1.15rem;box-shadow:0 8px 18px -8px rgba(29,112,240,.8);transition:transform .5s var(--ease)}
.brand:hover .brand__mark{transform:rotate(-6deg) scale(1.05)}
.brand__text{display:flex;flex-direction:column;line-height:1.1}
.brand__text strong{font-family:var(--font-display);font-size:1.02rem;letter-spacing:-.02em}
.brand__text span{font-size:.66rem;font-weight:700;letter-spacing:.18em;text-transform:uppercase;color:var(--brand-600);margin-top:.2rem}
.brand--light,.brand--light:hover{color:#fff}
.brand--light .brand__text span{color:var(--brand-300)}

.nav{margin-left:auto}
.nav__list{display:flex;align-items:center;gap:.15rem}
.nav__list>li>a,.menu__button{display:inline-flex;align-items:center;gap:.35rem;padding:.55rem .85rem;border-radius:999px;font-size:.9rem;font-weight:500;color:var(--ink-soft);transition:background .25s,color .25s}
.nav__list>li>a:hover,.menu__button:hover{background:var(--brand-50);color:var(--brand-700)}
.header__cta{margin-left:.5rem}

.menu{position:relative}
.menu__button{cursor:pointer;list-style:none;background:none;border:0;font-family:inherit}
.menu__button::-webkit-details-marker{display:none}
.menu__caret{width:.45rem;height:.45rem;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg) translateY(-2px);transition:transform .3s}
.menu[open] .menu__caret{transform:rotate(-135deg) translateY(-2px)}
.menu[open] .menu__button{background:var(--brand-50);color:var(--brand-700)}
.menu__panel{position:absolute;top:calc(100% + .6rem);left:50%;transform:translateX(-50%);width:min(720px,92vw);background:rgba(255,255,255,.94);backdrop-filter:blur(22px);border:1px solid #fff;border-radius:24px;box-shadow:var(--shadow-lg);padding:.5rem;display:grid;grid-template-columns:1fr 1fr;gap:.5rem;animation:pop .25s var(--ease)}
@keyframes pop{from{opacity:0;transform:translateX(-50%) translateY(-6px) scale(.98)}to{opacity:1;transform:translateX(-50%) translateY(0) scale(1)}}
.menu__col{background:rgba(238,247,255,.7);border-radius:18px;padding:.9rem}
.menu__heading{font-size:.86rem;font-weight:700;color:var(--ink);display:flex;flex-direction:column;gap:.1rem;padding:0 .5rem .5rem}
.menu__heading span{font-size:.66rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--brand-600)}
.menu__col ul{display:flex;flex-direction:column;gap:.1rem}
.menu__col a{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.45rem .5rem;border-radius:10px;font-size:.87rem;color:var(--ink-soft);transition:background .2s,color .2s}
.menu__col a:hover,.menu__col a.is-current{background:#fff;color:var(--brand-800)}
.menu__meta{font-size:.68rem;color:var(--ink-mute)}
.menu__foot{grid-column:1/-1;margin-top:.2rem}
.menu__foot a{display:flex;justify-content:space-between;background:linear-gradient(120deg,var(--brand-600),var(--brand-500));color:#fff;padding:.75rem 1.1rem;border-radius:16px;font-weight:600;font-size:.9rem}
.menu__foot a:hover{color:#fff;filter:brightness(1.06)}

.burger{display:none;margin-left:auto}
.burger>summary{list-style:none;cursor:pointer;display:grid;place-items:center;gap:5px;width:44px;height:44px;border-radius:12px}
.burger>summary::-webkit-details-marker{display:none}
.burger>summary span{display:block;width:20px;height:2px;background:var(--ink);border-radius:2px;transition:transform .3s,opacity .3s}
.burger[open]>summary span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger[open]>summary span:nth-child(2){opacity:0}
.burger[open]>summary span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.burger__panel{position:fixed;inset:72px 0 0;background:rgba(255,255,255,.98);backdrop-filter:blur(14px);overflow-y:auto;padding-block:1.5rem 3rem;z-index:99}
.burger__heading{font-size:.7rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--brand-600);margin:1.4rem 0 .5rem}
.burger__list a{display:block;padding:.8rem 1rem;border-radius:14px;font-size:1.05rem;font-weight:600;color:var(--ink);background:var(--brand-50);margin-bottom:.4rem}
.burger__list a:hover{background:var(--brand-100)}

@media (max-width:1080px){
  .nav,.header__cta{display:none}
  .burger{display:block}
}

/* ── hero ────────────────────────────────────────────────────────────── */
.hero{position:relative;overflow:hidden;padding:clamp(2.5rem,6vw,5rem) 0 clamp(4rem,8vw,7rem);background:linear-gradient(180deg,var(--brand-50),#fff 78%)}
.hero__bg{position:absolute;inset:0;pointer-events:none}
.hero__bg::after{content:"";position:absolute;inset:0;background-image:linear-gradient(to right,rgba(29,112,240,.07) 1px,transparent 1px),linear-gradient(to bottom,rgba(29,112,240,.07) 1px,transparent 1px);background-size:52px 52px;-webkit-mask-image:radial-gradient(ellipse at top,#000 25%,transparent 75%);mask-image:radial-gradient(ellipse at top,#000 25%,transparent 75%)}
.orb{position:absolute;border-radius:50%;filter:blur(90px)}
.orb--1{width:420px;height:420px;left:-8%;top:-14%;background:rgba(142,205,255,.5);animation:drift 13s ease-in-out infinite}
.orb--2{width:380px;height:380px;right:-6%;top:6%;background:rgba(188,224,255,.55);animation:drift 17s ease-in-out infinite reverse}
.orb--3{width:300px;height:300px;left:32%;bottom:-12%;background:rgba(217,237,255,.7);animation:drift 15s ease-in-out infinite}
@keyframes drift{0%,100%{transform:translate(0,0)}50%{transform:translate(24px,-26px)}}
.glyph{position:absolute;font-family:var(--font-math);font-size:clamp(1.4rem,3vw,2.4rem);color:rgba(51,143,251,.28);animation:drift 11s ease-in-out infinite}

.hero__grid{position:relative;display:grid;gap:clamp(2.5rem,5vw,4rem);align-items:center}
@media (min-width:960px){.hero__grid{grid-template-columns:1.05fr .95fr}}
.hero__copy h1{margin-top:1.4rem}
.hero__cta{display:flex;flex-wrap:wrap;gap:.7rem;margin-top:2rem}
.hero__ticks{display:flex;flex-wrap:wrap;gap:1.4rem;margin-top:2rem;font-size:.9rem;color:var(--ink-soft)}
.hero__ticks li{display:flex;align-items:center;gap:.45rem}
.hero__ticks li::before{content:"\2713";display:grid;place-items:center;width:1.05rem;height:1.05rem;border-radius:50%;background:var(--brand-600);color:#fff;font-size:.62rem;font-weight:700;flex:none}

.hero__panel{position:relative;max-width:520px;margin-inline:auto;width:100%}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow-md)}
.card--glass{background:rgba(255,255,255,.8);backdrop-filter:blur(20px) saturate(170%);border:1px solid rgba(255,255,255,.9);box-shadow:var(--shadow-lg);padding:clamp(1.2rem,2.5vw,1.75rem)}
.card--soft{background:linear-gradient(150deg,var(--brand-50),#fff);border:1px solid var(--brand-100);border-radius:var(--r-lg);padding:clamp(1.4rem,3vw,2rem)}
.demo__head{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem}
.demo__title{margin-top:.3rem;font-size:1.25rem}
.demo{margin-top:1.1rem;border:1px solid var(--brand-100);border-radius:18px;background:#fff;overflow:hidden}
.demo>summary{list-style:none;cursor:pointer;display:flex;align-items:flex-start;justify-content:space-between;gap:1rem;padding:1.1rem}
.demo>summary::-webkit-details-marker{display:none}
.demo__q{font-size:.98rem;color:var(--ink)}
.demo__marks{flex:none;background:#f1f5f9;border-radius:8px;padding:.15rem .5rem;font-size:.7rem;font-weight:600;color:var(--ink-mute)}
.demo__a{padding:0 1.1rem 1.1rem;background:var(--brand-50);border-top:1px solid var(--brand-100);padding-block:1rem;margin-inline:0;animation:fadeUp .3s var(--ease)}
.demo__sol{font-size:.72rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--brand-700)}
.demo__a .math{margin-top:.35rem;font-size:1.05rem;color:var(--ink)}
.demo__note{margin-top:.5rem;font-size:.78rem;color:var(--ink-mute)}
.demo__hint{margin-top:.6rem;font-size:.78rem;color:var(--ink-mute)}
.demo__stats{display:grid;grid-template-columns:repeat(3,1fr);gap:.6rem;margin-top:1.1rem}
.demo__stats li{background:rgba(255,255,255,.8);border:1px solid var(--brand-100);border-radius:14px;padding:.7rem;text-align:center}
.demo__stats strong{display:block;font-family:var(--font-display);font-size:1.3rem;color:var(--brand-700)}
.demo__stats span{font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-mute)}

.pill{position:absolute;background:rgba(255,255,255,.9);backdrop-filter:blur(14px);border:1px solid #fff;border-radius:16px;box-shadow:var(--shadow-md);padding:.7rem .95rem;font-size:.85rem;color:var(--ink)}
.pill strong{display:block;font-size:.66rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-mute);font-weight:700}
.pill--dates{left:-6%;top:8%}
.pill--sets{right:-4%;bottom:-6%}
@media (max-width:600px){.pill--dates{left:0}.pill--sets{right:0}}
.floaty{animation:bob 8s ease-in-out infinite}
.floaty--slow{animation-duration:11s}
.floaty--delay{animation-delay:.6s}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-14px)}}

/* ── stats & ticker ──────────────────────────────────────────────────── */
.stats{border-block:1px solid var(--brand-100);background:#fff;padding-block:clamp(2.25rem,4vw,3rem)}
.stats__note{text-align:center;font-size:.72rem;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-mute)}
.stats__grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1.75rem;margin-top:1.75rem;text-align:center}
@media (min-width:820px){.stats__grid{grid-template-columns:repeat(4,1fr)}}
.stats__grid strong{display:block;font-family:var(--font-display);font-size:clamp(2.2rem,4.4vw,3rem);font-weight:800;letter-spacing:-.03em;color:var(--ink)}
.stats__grid span{display:block;margin-top:.3rem;font-size:.85rem;color:var(--ink-soft)}
.ticker{margin-top:2.5rem;overflow:hidden;-webkit-mask-image:linear-gradient(to right,transparent,#000 12%,#000 88%,transparent);mask-image:linear-gradient(to right,transparent,#000 12%,#000 88%,transparent)}
.ticker__track{display:flex;gap:.7rem;width:max-content;animation:slide 42s linear infinite}
.ticker:hover .ticker__track{animation-play-state:paused}
.ticker span{white-space:nowrap;border:1px solid var(--brand-100);background:var(--brand-50);color:var(--brand-800);border-radius:999px;padding:.4rem 1rem;font-size:.85rem;font-weight:500}
@keyframes slide{from{transform:translateX(0)}to{transform:translateX(-50%)}}

/* ── features ────────────────────────────────────────────────────────── */
.features{display:grid;gap:1.1rem;grid-template-columns:1fr}
@media (min-width:760px){.features{grid-template-columns:repeat(2,1fr)}}
@media (min-width:1080px){.features{grid-template-columns:repeat(3,1fr)}.feature--wide{grid-column:span 2}}
.feature{position:relative;overflow:hidden;background:rgba(255,255,255,.85);border:1px solid var(--brand-100);border-radius:var(--r-lg);padding:1.7rem;transition:transform .4s var(--ease),box-shadow .4s var(--ease),border-color .3s}
.feature:hover{transform:translateY(-6px);border-color:var(--brand-300);box-shadow:0 26px 50px -18px rgba(29,112,240,.3)}
.feature::after{content:"";position:absolute;right:-60px;top:-60px;width:160px;height:160px;border-radius:50%;background:rgba(217,237,255,.55);filter:blur(28px);transition:transform .5s var(--ease)}
.feature:hover::after{transform:scale(1.6)}
.feature__n{position:relative;font-family:var(--font-display);font-size:.78rem;font-weight:800;letter-spacing:.14em;color:var(--brand-500)}
.feature h3{position:relative;margin-top:.7rem}
.feature p{position:relative;margin-top:.6rem;color:var(--ink-soft);font-size:.95rem}
.feature__list{position:relative;margin-top:1.1rem;display:grid;gap:.4rem}
.feature__list li{display:flex;gap:.5rem;font-size:.9rem;color:var(--ink)}
.feature__list li::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--brand-500);margin-top:.55rem;flex:none}

/* ── course groups & cards ───────────────────────────────────────────── */
.cgroup{margin-top:clamp(2.5rem,5vw,4rem)}
.cgroup__head{display:flex;flex-wrap:wrap;gap:1.25rem;align-items:flex-end;justify-content:space-between}
.cgroup__id{display:flex;gap:1rem;align-items:flex-start}
.cgroup__icon{display:grid;place-items:center;width:48px;height:48px;flex:none;border-radius:14px;background:#fff;color:var(--brand-700);border:1px solid var(--brand-100);box-shadow:var(--shadow-sm);font-size:1.1rem}
.cgroup__id h3{font-family:var(--font-display);font-size:clamp(1.4rem,2.6vw,1.9rem);font-weight:800;margin-top:.3rem}
.cgroup__desc{max-width:26rem;font-size:.92rem;color:var(--ink-soft)}
.cgrid{display:grid;gap:1rem;margin-top:1.75rem;grid-template-columns:1fr}
@media (min-width:640px){.cgrid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:1000px){.cgrid{grid-template-columns:repeat(3,1fr)}}
@media (min-width:1240px){.cgrid{grid-template-columns:repeat(4,1fr)}}
.ccard{position:relative;background:#fff;border:1px solid var(--brand-100);border-radius:var(--r);overflow:hidden;transition:transform .4s var(--ease),box-shadow .4s var(--ease),border-color .3s;height:100%}
.ccard:hover{transform:translateY(-6px);border-color:var(--brand-300);box-shadow:0 24px 44px -18px rgba(29,112,240,.35)}
.ccard::before{content:"";position:absolute;inset:0 0 auto;height:3px;background:linear-gradient(90deg,var(--brand-400),var(--brand-500),var(--brand-300));opacity:0;transition:opacity .4s}
.ccard:hover::before{opacity:1}
.ccard a{display:flex;flex-direction:column;height:100%;padding:1.4rem;color:var(--ink)}
.ccard a:hover{color:var(--ink)}
.ccard__stage{align-self:flex-start;background:var(--brand-50);border:1px solid var(--brand-100);color:var(--brand-700);border-radius:999px;padding:.2rem .65rem;font-size:.68rem;font-weight:700}
.ccard__go{position:absolute;top:1.25rem;right:1.25rem;display:grid;place-items:center;width:32px;height:32px;border-radius:50%;background:#f1f5f9;color:var(--ink-mute);transition:background .3s,color .3s,transform .3s}
.ccard:hover .ccard__go{background:var(--brand-600);color:#fff;transform:translate(2px,-2px)}
.ccard__title{margin-top:.9rem;font-size:1.06rem;line-height:1.3;padding-right:2.2rem}
.ccard__level{margin-top:.25rem;font-size:.72rem;color:var(--ink-mute);font-weight:500}
.ccard__tag{margin-top:.7rem;font-size:.88rem;color:var(--ink-soft);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.ccard__meta{margin-top:auto;padding-top:1.1rem;font-size:.74rem;color:var(--ink-mute)}

/* ── steps ───────────────────────────────────────────────────────────── */
.steps{display:grid;gap:1.5rem;counter-reset:s}
@media (min-width:820px){.steps{grid-template-columns:repeat(3,1fr);gap:2rem}}
.step{position:relative;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12);border-radius:var(--r-lg);padding:1.8rem;transition:background .35s,transform .35s var(--ease),border-color .35s}
.step:hover{background:rgba(255,255,255,.1);transform:translateY(-5px);border-color:rgba(142,205,255,.5)}
.step__n{display:grid;place-items:center;width:46px;height:46px;border-radius:14px;background:linear-gradient(135deg,var(--brand-500),var(--brand-700));color:#fff;font-family:var(--font-display);font-weight:800;font-size:1.15rem;box-shadow:0 12px 24px -10px rgba(51,143,251,.9)}
.step h3{margin-top:1.1rem;font-size:1.2rem}
.step p{margin-top:.55rem;color:rgba(214,234,255,.78);font-size:.95rem}
.step a{display:inline-block;margin-top:1.1rem;font-size:.85rem;font-weight:600}
@media (min-width:820px){.step:nth-child(2){margin-top:1.75rem}.step:nth-child(3){margin-top:3.5rem}}

/* ── split layouts ───────────────────────────────────────────────────── */
.split{display:grid;gap:clamp(2.5rem,5vw,4.5rem);align-items:center}
@media (min-width:960px){.split{grid-template-columns:1fr 1fr}.split--text{align-items:start}}
.split__media{position:relative}
.split__media>img{border-radius:var(--r-lg);box-shadow:var(--shadow-lg);border:1px solid var(--brand-100);aspect-ratio:4/3;object-fit:cover}
.callout{position:absolute;background:rgba(255,255,255,.92);backdrop-filter:blur(14px);border:1px solid #fff;border-radius:18px;box-shadow:var(--shadow-md);padding:1rem 1.1rem;font-size:.85rem;max-width:16rem}
.callout strong{font-family:var(--font-display);font-size:1.5rem;color:var(--brand-700);display:block}
.callout--a{left:-4%;bottom:-8%}
.callout--b{right:-3%;top:-6%;display:flex;align-items:center;gap:.5rem;font-weight:600;max-width:none}
@media (max-width:640px){.callout--a{left:0}.callout--b{right:0}}
.ticklist{margin-top:2rem;display:grid;gap:1.4rem}
@media (min-width:640px){.ticklist{grid-template-columns:1fr 1fr}}
.ticklist li{display:flex;flex-direction:column;gap:.35rem;padding-left:2.6rem;position:relative}
.ticklist li::before{content:"";position:absolute;left:0;top:.1rem;width:34px;height:34px;border-radius:11px;background:var(--brand-50);border:1px solid var(--brand-100)}
.ticklist li::after{content:"\2713";position:absolute;left:0;top:.1rem;width:34px;height:34px;display:grid;place-items:center;color:var(--brand-700);font-weight:700;font-size:.85rem}

/* ── testimonials ────────────────────────────────────────────────────── */
.quotes{columns:1;column-gap:1.1rem}
@media (min-width:700px){.quotes{columns:2}}
@media (min-width:1060px){.quotes{columns:3}}
.quote{position:relative;break-inside:avoid;margin-bottom:1.1rem;background:#fff;border:1px solid var(--brand-100);border-radius:var(--r-lg);padding:1.7rem;transition:transform .4s var(--ease),box-shadow .4s var(--ease),border-color .3s}
.quote:hover{transform:translateY(-6px);border-color:var(--brand-300);box-shadow:0 24px 44px -18px rgba(29,112,240,.3)}
.quote__mark{position:absolute;top:.4rem;right:1.1rem;font-family:var(--font-display);font-size:3.5rem;line-height:1;color:var(--brand-100)}
.quote__stars{color:#f59e0b;letter-spacing:.12em;font-size:.85rem}
.quote blockquote{margin:.8rem 0 0;font-size:.96rem;color:var(--ink)}
.quote figcaption{display:flex;align-items:center;gap:.7rem;margin-top:1.3rem}
.quote__avatar{display:grid;place-items:center;width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,var(--brand-400),var(--brand-700));color:#fff;font-family:var(--font-display);font-weight:700;font-size:.9rem;flex:none}
.quote figcaption strong{display:block;font-size:.9rem}
.quote figcaption em{display:block;font-style:normal;font-size:.76rem;color:var(--ink-mute)}

/* ── FAQ ─────────────────────────────────────────────────────────────── */
.faq{display:grid;gap:.7rem}
.faq__item{background:rgba(255,255,255,.7);border:1px solid #e2e8f0;border-radius:var(--r);overflow:hidden;transition:border-color .3s,box-shadow .3s,background .3s}
.faq__item[open]{border-color:var(--brand-200);background:#fff;box-shadow:var(--shadow-md)}
.faq__item>summary{list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:1.15rem 1.35rem;font-family:var(--font-display);font-weight:700;font-size:1rem;color:var(--ink)}
.faq__item>summary::-webkit-details-marker{display:none}
.faq__item>summary::after{content:"+";display:grid;place-items:center;width:30px;height:30px;flex:none;border-radius:50%;background:var(--brand-50);color:var(--brand-700);font-size:1.15rem;font-weight:600;transition:transform .3s,background .3s,color .3s}
.faq__item[open]>summary::after{transform:rotate(45deg);background:var(--brand-600);color:#fff}
.faq__body{padding:0 1.35rem 1.35rem;color:var(--ink-soft);font-size:.96rem;animation:fadeUp .3s var(--ease)}

/* ── CTA ─────────────────────────────────────────────────────────────── */
.section--cta{padding-top:0}
.cta{position:relative;overflow:hidden;text-align:center;border-radius:36px;padding:clamp(2.75rem,6vw,5rem) clamp(1.4rem,5vw,4rem);background:linear-gradient(135deg,var(--brand-600),var(--brand-500) 55%,var(--brand-400));color:#fff;box-shadow:var(--shadow-lg)}
.cta__bg span{position:absolute;border-radius:50%;filter:blur(70px)}
.cta__bg span:first-child{width:340px;height:340px;left:-8%;top:-40%;background:rgba(255,255,255,.22);animation:drift 14s ease-in-out infinite}
.cta__bg span:last-child{width:380px;height:380px;right:-8%;bottom:-45%;background:rgba(20,40,86,.32);animation:drift 18s ease-in-out infinite reverse}
.cta::after{content:"";position:absolute;inset:0;background-image:linear-gradient(to right,#fff 1px,transparent 1px),linear-gradient(to bottom,#fff 1px,transparent 1px);background-size:42px 42px;opacity:.1;-webkit-mask-image:radial-gradient(ellipse at center,#000,transparent 72%);mask-image:radial-gradient(ellipse at center,#000,transparent 72%)}
.cta>*{position:relative;z-index:1}
.cta h2{color:#fff;max-width:22ch;margin-inline:auto}
.cta p{margin-top:1.1rem;color:rgba(238,247,255,.9);max-width:44ch;margin-inline:auto}
.cta__btns{display:flex;flex-wrap:wrap;gap:.7rem;justify-content:center;margin-top:2rem}

/* ── footer ──────────────────────────────────────────────────────────── */
.foot{position:relative;overflow:hidden;background:var(--brand-950);color:var(--brand-100);margin-top:0}
.foot::before,.foot::after{content:"";position:absolute;border-radius:50%;filter:blur(110px)}
.foot::before{width:380px;height:380px;left:-8%;top:-10%;background:rgba(29,112,240,.3)}
.foot::after{width:340px;height:340px;right:-6%;bottom:-14%;background:rgba(89,176,255,.22)}
.foot__grid{position:relative;display:grid;gap:2.5rem;padding-block:clamp(3rem,6vw,4.5rem)}
@media (min-width:760px){.foot__grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:1080px){.foot__grid{grid-template-columns:1.6fr 1fr 1fr .9fr;gap:2rem}}
.foot__about p{margin-top:1.2rem;font-size:.9rem;color:rgba(188,224,255,.75);max-width:22rem}
.foot__about address{margin-top:1.2rem;font-size:.87rem;color:rgba(188,224,255,.8);display:grid;gap:.5rem}
.foot__about a{color:rgba(217,237,255,.9)}
.foot__about a:hover{color:#fff}
.foot__title{font-size:.9rem;font-weight:700;color:#fff}
.foot__title--mt{margin-top:1.6rem}
.foot__sub{font-size:.66rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--brand-300);margin-top:.15rem}
.foot__col ul{margin-top:.9rem;display:grid;gap:.5rem;font-size:.88rem}
.foot__col a{color:rgba(188,224,255,.78);position:relative;padding-left:.9rem}
.foot__col a::before{content:"";position:absolute;left:0;top:.62em;width:0;height:1px;background:var(--brand-300);transition:width .3s}
.foot__col a:hover{color:#fff}
.foot__col a:hover::before{width:.5rem}
.foot__base{position:relative;display:flex;flex-wrap:wrap;gap:.75rem;justify-content:space-between;border-top:1px solid rgba(255,255,255,.12);padding-block:1.5rem;font-size:.76rem;color:rgba(188,224,255,.6)}

/* ══════════ COURSE PAGES ══════════ */
.chead{position:relative;overflow:hidden;padding:clamp(2rem,4vw,3.25rem) 0 clamp(2.75rem,5vw,4.5rem);background:linear-gradient(180deg,var(--brand-50),#fff)}
.chead__bg{position:absolute;inset:0;pointer-events:none}
.chead__bg::after{content:"";position:absolute;inset:0;background-image:linear-gradient(to right,rgba(29,112,240,.07) 1px,transparent 1px),linear-gradient(to bottom,rgba(29,112,240,.07) 1px,transparent 1px);background-size:52px 52px;-webkit-mask-image:radial-gradient(ellipse at top left,#000 20%,transparent 72%);mask-image:radial-gradient(ellipse at top left,#000 20%,transparent 72%)}
.crumbs{position:relative}
.crumbs ol{display:flex;flex-wrap:wrap;gap:.5rem;font-size:.85rem;color:var(--ink-mute)}
.crumbs li+li::before{content:"/";margin-right:.5rem;color:var(--brand-200)}
.crumbs [aria-current]{color:var(--ink);font-weight:500}
.chead__grid{position:relative;display:grid;gap:2.5rem;align-items:end;margin-top:1.9rem}
@media (min-width:1000px){.chead__grid{grid-template-columns:1.55fr .9fr}}
.chead__tag{margin-top:.9rem;font-family:var(--font-display);font-size:clamp(1.1rem,2.2vw,1.45rem);font-weight:600;color:var(--brand-700)}
.chead__cta{display:flex;flex-wrap:wrap;gap:.7rem;margin-top:1.9rem}
.jumpnav{display:flex;flex-wrap:wrap;gap:.35rem;margin-top:1.6rem}
.jumpnav a{border:1px solid var(--brand-100);background:#fff;border-radius:999px;padding:.4rem .9rem;font-size:.82rem;font-weight:500;color:var(--ink-soft);transition:all .25s}
.jumpnav a:hover{background:var(--brand-600);border-color:var(--brand-600);color:#fff}
.upcoming{padding:1.4rem}
.upcoming ul{margin-top:.9rem;display:grid;gap:.6rem}
.upcoming li{display:flex;align-items:center;gap:.7rem;background:rgba(255,255,255,.85);border:1px solid var(--brand-100);border-radius:14px;padding:.7rem .8rem}
.upcoming__text{min-width:0;flex:1}
.upcoming__text em{display:block;font-style:normal;font-size:.7rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-mute)}
.upcoming__text strong{display:block;font-size:.9rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.upcoming__add{flex:none;font-size:.72rem;font-weight:700;color:var(--brand-600);border:1px solid var(--brand-200);border-radius:999px;padding:.2rem .55rem;transition:all .25s}
.upcoming__add:hover{background:var(--brand-600);border-color:var(--brand-600);color:#fff}
.upcoming__foot{margin-top:1rem;font-size:.85rem}

.checklist{margin-top:1.1rem;display:grid;gap:.75rem}
.checklist li{position:relative;padding-left:1.9rem;font-size:.95rem;color:var(--ink-soft)}
.checklist li::before{content:"\2713";position:absolute;left:0;top:.1rem;display:grid;place-items:center;width:1.25rem;height:1.25rem;border-radius:50%;background:var(--brand-600);color:#fff;font-size:.68rem;font-weight:700}

.units{display:grid;gap:1rem}
@media (min-width:820px){.units{grid-template-columns:1fr 1fr}}
.unit{background:#fff;border:1px solid var(--brand-100);border-radius:var(--r-lg);overflow:hidden;transition:border-color .3s,box-shadow .3s}
.unit[open]{border-color:var(--brand-300);box-shadow:var(--shadow-md)}
.unit>summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:1rem;padding:1.35rem}
.unit>summary::-webkit-details-marker{display:none}
.unit__n{display:grid;place-items:center;width:44px;height:44px;flex:none;border-radius:14px;background:linear-gradient(135deg,var(--brand-500),var(--brand-700));color:#fff;font-family:var(--font-display);font-weight:800;box-shadow:0 10px 20px -10px rgba(29,112,240,.9)}
.unit__t{flex:1;min-width:0}
.unit__t strong{display:block;font-family:var(--font-display);font-size:1.05rem}
.unit__t em{display:block;font-style:normal;font-size:.8rem;color:var(--ink-mute)}
.unit__caret{width:.5rem;height:.5rem;border-right:2px solid var(--brand-500);border-bottom:2px solid var(--brand-500);transform:rotate(45deg);transition:transform .3s;flex:none}
.unit[open] .unit__caret{transform:rotate(-135deg)}
.unit__body{padding:0 1.35rem 1.35rem;animation:fadeUp .3s var(--ease)}
.unit__body ul{display:grid;gap:.45rem}
@media (min-width:560px){.unit__body ul{grid-template-columns:1fr 1fr}}
.unit__body li{display:flex;gap:.5rem;background:var(--brand-50);border-radius:12px;padding:.6rem .75rem;font-size:.87rem;color:var(--ink-soft)}
.unit__body li::before{content:"\2713";color:var(--brand-600);font-weight:700;font-size:.78rem;flex:none}

.agrid{display:grid;gap:1.1rem}
@media (min-width:760px){.agrid{grid-template-columns:repeat(3,1fr)}}
.acard{position:relative;overflow:hidden;background:#fff;border:1px solid var(--brand-100);border-radius:var(--r-lg);padding:1.7rem;transition:transform .4s var(--ease),box-shadow .4s var(--ease),border-color .3s;height:100%}
.acard:hover{transform:translateY(-6px);border-color:var(--brand-300);box-shadow:0 26px 50px -18px rgba(29,112,240,.3)}
.acard__n{font-family:var(--font-display);font-size:2.7rem;font-weight:800;color:var(--brand-100);line-height:1}
.acard h3{margin-top:.5rem}
.acard p{margin-top:.5rem;color:var(--ink-soft);font-size:.94rem}

.pset{margin-top:2.5rem;border:1px solid rgba(255,255,255,.14);border-radius:var(--r-lg);background:rgba(255,255,255,.045);overflow:hidden}
.pset__head{display:flex;flex-wrap:wrap;gap:1rem;justify-content:space-between;align-items:flex-end;padding:1.5rem;border-bottom:1px solid rgba(255,255,255,.12)}
.pset__head h3{font-size:1.3rem;margin-top:.3rem}
.pset__meta{margin-top:.3rem;font-size:.85rem;color:rgba(214,234,255,.7)}
.pset__print a{font-size:.82rem;font-weight:600;border:1px solid rgba(255,255,255,.28);border-radius:999px;padding:.4rem .9rem;color:#fff;transition:background .25s}
.pset__print a:hover{background:rgba(255,255,255,.16);color:#fff}
.qlist>li+li{border-top:1px solid rgba(255,255,255,.1)}
.q{padding:1.4rem 1.5rem}
.q__row{display:flex;gap:.9rem;align-items:flex-start}
.q__n{flex:none;font-family:var(--font-display);font-weight:800;font-size:.85rem;color:var(--brand-300);padding-top:.15rem}
.q__text{flex:1;font-size:1rem;color:#fff}
.q__marks{flex:none;background:rgba(255,255,255,.12);border-radius:8px;padding:.15rem .5rem;font-size:.7rem;font-weight:600;color:var(--brand-100)}
.q__sol{margin-top:.85rem;margin-left:2.1rem}
.q__sol>summary{list-style:none;cursor:pointer;display:inline-flex;align-items:center;gap:.4rem;background:rgba(255,255,255,.12);border-radius:999px;padding:.4rem .9rem;font-size:.78rem;font-weight:600;color:var(--brand-100);transition:background .25s,color .25s}
.q__sol>summary::-webkit-details-marker{display:none}
.q__sol>summary::before{content:"\2726"}
.q__sol>summary:hover{background:var(--brand-500);color:#fff}
.q__sol[open]>summary{background:rgba(142,205,255,.24)}
.q__solbody{margin-top:.7rem;border:1px solid rgba(142,205,255,.28);background:rgba(51,143,251,.16);border-radius:16px;padding:1rem;animation:fadeUp .3s var(--ease)}
.q__solbody .math{margin-top:.3rem;font-size:1.02rem;color:#fff}

.timeline{position:relative;padding-left:1.9rem}
.timeline::before{content:"";position:absolute;left:.35rem;top:.6rem;bottom:.6rem;width:2px;background:var(--brand-200)}
.tdate{position:relative;display:flex;flex-wrap:wrap;align-items:center;gap:.8rem;background:#fff;border:1px solid #e2e8f0;border-radius:var(--r);padding:1rem 1.15rem;margin-bottom:.7rem;transition:transform .35s var(--ease),border-color .3s,box-shadow .35s}
.tdate:hover{transform:translateX(4px);border-color:var(--brand-300);box-shadow:var(--shadow-md)}
.tdate__dot{position:absolute;left:-1.85rem;top:1.35rem;width:.8rem;height:.8rem;border-radius:50%;box-shadow:0 0 0 4px #fff}
.tdate__body{flex:1;min-width:12rem}
.tdate__when{font-size:.7rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-mute)}
.tdate__what{margin-top:.2rem;font-family:var(--font-display);font-weight:700;font-size:.98rem}
.star{color:var(--brand-500)}
.tdate__add{flex:none;font-size:.74rem;font-weight:700;color:var(--brand-700);border:1px solid var(--brand-200);border-radius:999px;padding:.3rem .7rem;background:#fff;transition:all .25s}
.tdate__add:hover{background:var(--brand-600);border-color:var(--brand-600);color:#fff}
.legend{margin-top:1.6rem;display:flex;flex-wrap:wrap;gap:.5rem}

.duo{display:grid;gap:1.1rem}
@media (min-width:820px){.duo{grid-template-columns:1fr 1fr}}
.duo__card{border-radius:var(--r-lg);padding:clamp(1.6rem,3vw,2.2rem);background:#fff;border:1px solid var(--brand-100);height:100%}
.duo__card--grad{background:linear-gradient(135deg,var(--brand-600),var(--brand-500));color:#fff;border:0;box-shadow:0 24px 44px -18px rgba(29,112,240,.55)}
.duo__card--grad h3{color:#fff;margin-top:.5rem;font-size:1.4rem}
.duo__card--grad p{margin-top:.7rem;color:rgba(238,247,255,.9)}
.duo__card h3{margin-top:.5rem;font-size:1.4rem}
.reslist{margin-top:1.1rem;display:grid;gap:.45rem}
.reslist a{display:flex;align-items:center;justify-content:space-between;gap:1rem;border:1px solid #e2e8f0;border-radius:14px;padding:.75rem 1rem;font-size:.9rem;font-weight:500;color:var(--ink-soft);transition:all .25s}
.reslist a:hover{border-color:var(--brand-300);background:var(--brand-50);color:var(--brand-800);transform:translateX(3px)}

.pager{display:grid;gap:1rem;margin-top:3rem}
@media (min-width:700px){.pager{grid-template-columns:1fr 1fr}}
.pager__link{display:flex;flex-direction:column;gap:.2rem;border:1px solid #e2e8f0;border-radius:var(--r);padding:1.1rem 1.3rem;background:#fff;transition:all .3s}
.pager__link:hover{border-color:var(--brand-300);background:var(--brand-50)}
.pager__link span{font-size:.7rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-mute)}
.pager__link strong{font-family:var(--font-display);color:var(--ink)}
.pager__link--next{text-align:right;align-items:flex-end}

.minicta{display:flex;flex-wrap:wrap;gap:1.5rem;align-items:center;justify-content:space-between;margin-top:3rem;padding:clamp(1.6rem,3vw,2.2rem);border:1px solid var(--brand-100);border-radius:var(--r-lg);background:linear-gradient(120deg,var(--brand-50),#fff)}
.minicta h3{font-size:1.2rem}
.minicta p{margin-top:.3rem;color:var(--ink-soft);font-size:.93rem}

/* ── reveal (progressive: only active when JS is on) ─────────────────── */
@keyframes fadeUp{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:translateY(0)}}
.js .reveal{opacity:0;transform:translateY(22px);transition:opacity .75s var(--ease),transform .75s var(--ease);transition-delay:var(--d,0ms)}
.js .reveal.is-in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
  .js .reveal{opacity:1;transform:none}
}

/* ── print: clean revision handout ───────────────────────────────────── */
@media print{
  .header,.foot,.jumpnav,.chead__cta,.pset__print,.tdate__add,.upcoming__add,.pager,.minicta,.hero__panel,.cta,.burger{display:none!important}
  body{color:#000;background:#fff;font-size:11pt}
  .section,.section--dark,.section--tint,.chead,.hero{background:#fff!important;color:#000!important;padding:1rem 0}
  .section--dark h2,.section--dark h3,.q__text,.q__solbody .math{color:#000!important}
  .card,.unit,.acard,.tdate,.pset,.q{border:1px solid #bbb!important;box-shadow:none!important;background:#fff!important;break-inside:avoid}
  .q__sol[open] .q__solbody{border:1px solid #bbb!important;background:#fff!important}
  a{color:#000;text-decoration:none}
}