:root{
  --bg:#0b0f1a; --panel:#0f1525cc; --text:#E6EAF2; --muted:#C7D2E1;
  --primary:#34d399;           /* verde ciencia */
  --secondary:#22d3ee;         /* cyan */
  --brand-grad:linear-gradient(120deg,var(--primary),var(--secondary));
  --ring:#264458; --radius:16px; --shadow:0 10px 30px rgba(0,0,0,.25);
  --gutterX:clamp(18px,6.5vw,56px); --navH:84px;
}
@media (max-width:920px){ :root{ --navH:72px; } }

*{box-sizing:border-box}
html,body{height:100%}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:Inter,system-ui,Segoe UI,Roboto,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;line-height:1.45;overflow-x:hidden;
}
a{color:inherit;text-decoration:none}

/* Container */
.container{
  max-width:1100px;margin-inline:auto;
  padding-left:max(var(--gutterX),16px,env(safe-area-inset-left));
  padding-right:max(var(--gutterX),16px,env(safe-area-inset-right));
}

/* ===== Fondos ===== */
.bg-math{position:fixed;inset:0;z-index:-3;pointer-events:none;
  background:
    radial-gradient(1200px 600px at 12% 12%, #0b2419 0%, transparent 55%),
    radial-gradient(900px 500px at 80% 20%, #0a1e26 0%, transparent 60%),
    radial-gradient(1000px 600px at 20% 80%, #09221a 0%, transparent 55%),
    linear-gradient(160deg,#0a1417 0%, #0b0f1a 70%);
}
.grid-floor{position:fixed;left:-10vw;right:-10vw;bottom:-30vh;height:65vh;z-index:-2;pointer-events:none;
  background:
    repeating-linear-gradient(to right, #34d39925 0 2px, transparent 2px 60px),
    repeating-linear-gradient(to top,   #22d3ee25 0 2px, transparent 2px 60px);
  transform:perspective(800px) rotateX(60deg) translateY(10vh);
  filter:drop-shadow(0 -10px 40px rgba(34,211,238,.08));
}
.math-stream{position:fixed;inset:-20vh -10vw;z-index:-1;opacity:.45;pointer-events:none;filter:blur(.1px)}
.math-stream span{
  position:absolute;white-space:nowrap;font:700 13px/1.6 ui-monospace,Menlo,Consolas,monospace;
  letter-spacing:.6px;color:#b2ffe5;text-shadow:0 0 10px rgba(52,211,153,.2);
  animation:float 22s linear infinite;will-change:transform;
}
.math-stream span:nth-child(1){top:14%;left:-10%;animation-duration:24s}
.math-stream span:nth-child(2){top:46%;left:-6%; animation-duration:28s}
.math-stream span:nth-child(3){top:78%;left:-12%;animation-duration:26s}
@keyframes float{to{transform:translate3d(22vw,-12vh,0)}}

/* ===== Navbar ===== */
.navbar{position:sticky;top:0;z-index:50;backdrop-filter:saturate(160%) blur(10px);padding-top:env(safe-area-inset-top)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0}
.brand{display:flex;align-items:center;gap:12px}
.logo{width:34px;height:34px;border-radius:12px;background:url("/assets/logo.png") center/contain no-repeat, #0f1525;border:1px solid #1a2235;box-shadow:0 6px 22px rgba(43,138,255,.18)}
.brand b{font-family:"Plus Jakarta Sans",Inter,sans-serif;letter-spacing:.2px}
.nav{display:flex;gap:18px;align-items:center}
.nav a{color:var(--muted);font-weight:600;font-size:14px;opacity:.9}
.nav a:hover{color:#fff}
.cta{padding:10px 14px;border-radius:12px;background:var(--brand-grad);color:#052016!important;font-weight:800;box-shadow:0 10px 24px rgba(34,211,238,.22)}
.scrolled{box-shadow:0 12px 30px rgba(0,0,0,.25);border-bottom:1px solid #1a2235}

/* ===== Hero & base ===== */
.hero{padding-block:92px 24px}
.crumbs{font-size:13px;color:#a9f3df}
.crumbs a{color:#a9f3df}
.pill{display:inline-flex;gap:8px;align-items:center;padding:8px 12px;border:1px solid var(--ring);border-radius:999px;color:var(--muted);background:#0f152580}
.spark{width:10px;height:10px;border-radius:50%;background:var(--brand-grad);box-shadow:0 0 0 6px rgba(34,211,238,.10)}
.title{font-family:"Plus Jakarta Sans",Inter,sans-serif;font-weight:800;line-height:1.04;font-size:clamp(32px,6vw,56px);letter-spacing:-.02em;margin:16px 0 10px}
h1.title{isolation:isolate;position:relative}
.title .grad{
  display:inline-block;background:var(--brand-grad);background-size:100% 100%;background-repeat:no-repeat;
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent;
}
.lead{max-width:840px;color:#C7D2E1;font-size:clamp(16px,2.5vw,18px);line-height:1.7}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:12px 16px;border-radius:14px;border:1px solid var(--ring);background:#0f1525a0;color:#EAF2FF;font-weight:700}
.btn:hover{border-color:#355}
.btn.primary{background:var(--brand-grad);color:#00150f;border:none}

/* ===== Doodles matemáticos (nuevos, no 3D) ===== */
.doodles{position:relative;height:130px;margin-top:18px;pointer-events:none}
.doodles > *{position:absolute;opacity:.9;animation:float3d 20s linear infinite}
@keyframes float3d{0%{transform:translateY(0) rotate(0)}50%{transform:translateY(-8px) rotate(180deg)}100%{transform:translateY(0) rotate(360deg)}}
@media (prefers-reduced-motion:reduce){.doodles > *{animation:none}}

.d-plus{left:0;top:6px;width:64px;height:64px;background:linear-gradient(135deg,var(--primary),var(--secondary));
  clip-path:polygon(40% 0,60% 0,60% 40%,100% 40%,100% 60%,60% 60%,60% 100%,40% 100%,40% 60%,0 60%,0 40%,40% 40%)}
.d-angle{left:120px;top:-10px;width:70px;height:70px;background:
  conic-gradient(from 0deg, var(--secondary) 0 60deg, transparent 60deg);
  border-radius:12px}
.d-frac{left:220px;top:18px;width:90px;height:48px;background:linear-gradient(180deg,transparent 48%, #b7ffe2 48% 52%, transparent 0), radial-gradient(circle at 30% 30%, #b7ffe2 0 6px, transparent 7px), radial-gradient(circle at 70% 70%, #b7ffe2 0 6px, transparent 7px);border-radius:8px}
.d-pi{left:340px;top:-4px;width:56px;height:56px;border-radius:999px;background:linear-gradient(135deg,var(--primary),var(--secondary));display:grid;place-items:center}
.d-pi span{font:800 22px/1 "Plus Jakarta Sans", Inter, sans-serif;color:#06251b;text-shadow:0 2px 10px rgba(0,0,0,.25)}

/* ===== Secciones & cards ===== */
.section{padding-block:48px;position:relative}
.section h2{font-family:"Plus Jakarta Sans",Inter,sans-serif;font-weight:800;font-size:clamp(22px,3.2vw,26px);letter-spacing:.2px;margin:0 0 16px}
.muted{color:var(--muted)}
.grid{display:grid;gap:18px}
.two{grid-template-columns:1.1fr .9fr}
.two-equal{grid-template-columns:1fr 1fr}
@media (max-width:960px){.two,.two-equal{grid-template-columns:1fr}}
.card{position:relative;overflow:hidden;border-radius:18px;padding:20px;background:linear-gradient(180deg,#0f1525cc,#0f1525a6);border:1px solid #1e2a3e;box-shadow:var(--shadow)}
.card::before{content:"";position:absolute;inset:-2px;border-radius:20px;padding:2px;background:
  linear-gradient(140deg,rgba(52,211,153,.35),rgba(34,211,238,.35),transparent);
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;pointer-events:none}
.column{display:flex;flex-direction:column;gap:12px}
.meta{display:flex;flex-wrap:wrap;gap:8px}
.pill.small{padding:6px 10px;font-weight:700}
.list{margin:8px 0 0 18px;line-height:1.7}

/* Decor de sección (otros doodles) */
.decor{position:absolute;inset:auto 0 -6px auto;pointer-events:none}
.decor > *{position:absolute;opacity:.9;animation:float3d 20s linear infinite}
@media (prefers-reduced-motion:reduce){.decor > *{animation:none}}
.d-hex{left:-6px;top:-10px;width:70px;height:70px;clip-path:polygon(25% 0,75% 0,100% 50%,75% 100%,25% 100%,0 50%);background:linear-gradient(135deg,var(--primary),var(--secondary))}
.d-number{right:14%;top:-20px;font:800 42px/1 "Plus Jakarta Sans", Inter, sans-serif;color:#a6ffe0;opacity:.7}
.d-arrow{right:2%;top:0;width:80px;height:80px;background:
  linear-gradient(135deg,transparent 0 40%, #a6ffe0 41% 45%, transparent 46%),
  linear-gradient(135deg,transparent 0 49%, #a6ffe0 50% 54%, transparent 55%);}
.d-arrow.small{transform:scale(.7) translateY(10px)}
.d-hex.small{transform:scale(.75) translateY(8px)}

/* Schedule */
.schedule{display:grid;gap:14px}
.slot{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:16px;border:1px solid #1e2846;border-radius:14px;background:#111a30;flex-wrap:wrap}
.slot strong{font-weight:800}

/* Perfil profe */
.profile{display:flex;gap:14px;align-items:center}
.avatar{width:64px;height:64px;border-radius:16px;border:1px solid #1e2846;object-fit:cover;display:block;background:#0f1525}

/* FAQ */
details{border:1px solid #1e2846;border-radius:14px;padding:14px;background:#0f1525}
summary{cursor:pointer;font-weight:800}

/* Planes */
.plan{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px;border:1px solid #1e2846;border-radius:14px;background:#0f1525}
.plan-title{font-weight:800}

/* Utils */
.mt-8{margin-top:8px}.mt-10{margin-top:10px}.mt-14{margin-top:14px}
.small{font-size:13px}.center{text-align:center}

/* Reveal */
.reveal{opacity:0;transform:translateY(8px);transition:opacity .4s ease, transform .4s ease}
.reveal.in{opacity:1;transform:none}

/* FAQ grid */
.faq-grid{grid-template-columns:1fr 1fr}
@media (max-width:900px){ .faq-grid{grid-template-columns:1fr} }

/* ===== Móvil: botón y panel con fix de stacking ===== */
.hamburger{display:none;align-items:center;justify-content:center;width:40px;height:40px;border-radius:12px;border:1px solid #1a2235;background:#0f1525;color:#cfe3ff}
.hamburger svg{width:22px;height:22px}
@media (max-width:920px){.nav{display:none}.hamburger{display:flex}}

.mobile-panel{
  position:fixed;inset:0;z-index:60;
  background:rgba(7,11,20,.6);backdrop-filter:blur(10px);
  opacity:0;pointer-events:none;transition:opacity .28s ease;
  display:grid;grid-template-rows:auto 1fr;
}
.mobile-panel.open{opacity:1;pointer-events:auto}
.mobile-backdrop{position:absolute;inset:0;z-index:0}
.mobile-sheet{
  position:relative;z-index:1;
  margin:16px auto;padding:20px;border-radius:20px;max-width:640px;width:calc(100% - 32px);
  background:linear-gradient(180deg,#0f1525f2,#0f1525e6);border:1px solid #1e2846;box-shadow:var(--shadow);
  transform:translateY(-18px);opacity:0;transition:transform .28s ease, opacity .28s ease;
}
.mobile-panel.open .mobile-sheet{transform:none;opacity:1}
.mobile-menu{display:flex;flex-direction:column;gap:14px}
.mobile-menu a{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border-radius:14px;border:1px solid #1f2a48;background:#121a31;color:#d5def1;font-weight:700}
.mobile-menu .cta{color:#eeeeee!important}

/* Offset anclas para navbar sticky */
header.hero, .section, section[id]{scroll-margin-top:calc(var(--navH) + 10px)}
:focus-visible{outline:2px solid #7fe9d1;outline-offset:2px;border-radius:12px}

/* Móvil */
@media (max-width:520px){
  .btn{padding:12px 14px}
  .two-equal{grid-template-columns:1fr}
}