/* ================================================================
   MATEMÁTICAS ACTIVA — styles.css  (rediseño completo)
================================================================ */
:root {
    --navy:#0f172a;--navy2:#1e293b;--blue:#2563eb;--blue2:#1d4ed8;
    --purple:#7c3aed;--teal:#0d9488;--orange:#ea580c;--red:#dc2626;
    --indigo:#4338ca;--green:#16a34a;--pink:#db2777;--gold:#f59e0b;
    --white:#fff;--gray50:#f8fafc;--gray100:#f1f5f9;--gray200:#e2e8f0;
    --gray400:#94a3b8;--gray600:#475569;--gray800:#1e293b;
    --radius:12px;--radius-lg:20px;
    --shadow:0 4px 24px rgba(0,0,0,.10);--shadow-lg:0 12px 48px rgba(0,0,0,.18);
    --font:'Poppins',system-ui,sans-serif;--font-body:'Inter',system-ui,sans-serif;
    --navbar-h:68px;
}
/* Dark mode */
body.dark{
    --navy:#0f172a;--navy2:#1e293b;
    --white:#0f172a;--gray50:#0f172a;--gray100:#1e293b;--gray200:#334155;
    --gray400:#94a3b8;--gray600:#cbd5e1;--gray800:#f1f5f9;
    --shadow:0 4px 24px rgba(0,0,0,.30);--shadow-lg:0 12px 48px rgba(0,0,0,.40);
    color-scheme:dark;
}
body.dark .section,body.dark .premium-section{background:var(--gray50)}
body.dark .section-alt{background:var(--gray100)}
body.dark .card,body.dark .qp-card,body.dark .mat-card,body.dark .ej-card,body.dark .diag-card,body.dark .diag-resultado{background:var(--gray100);border-color:var(--gray200);color:var(--gray800)}
body.dark input,body.dark select,body.dark textarea{background:var(--gray100);border-color:var(--gray200);color:var(--gray800)}
body.dark .hero{background:linear-gradient(135deg,#0c1222 0%,#111827 50%,#0c1a3a 100%)}
body.dark .navbar{background:rgba(15,23,42,.95);border-color:#334155}
body.dark .mat-estado-inactiva,body.dark .mat-premium-banner{background:var(--gray100);border-color:var(--gray200)}
body.dark a{color:inherit}
body.dark .footer{background:#080e1c}
body.dark .perfil-section{background:var(--gray100)}
body.dark .modal-content,body.dark .auth-form{background:var(--gray100);color:var(--gray800)}
body.dark .toast{background:var(--gray100);color:var(--gray800);border-color:var(--gray200)}
.dark-toggle{background:none;border:1px solid rgba(255,255,255,.2);color:white;font-size:18px;cursor:pointer;padding:4px 8px;border-radius:8px;transition:all .2s;line-height:1}
.dark-toggle:hover{background:rgba(255,255,255,.15)}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;scroll-padding-top:var(--navbar-h);}
body{font-family:var(--font-body);background:var(--gray50);color:var(--gray800);min-height:100vh;overflow-x:hidden;transition:background .3s,color .3s;}
img{display:block;max-width:100%;}
a{text-decoration:none;color:inherit;}
ul{list-style:none;}

/* ── NAVBAR ── */
.navbar{position:fixed;top:0;left:0;right:0;z-index:900;height:var(--navbar-h);background:rgba(15,23,42,.95);backdrop-filter:blur(14px);border-bottom:1px solid rgba(255,255,255,.07);}
.navbar-inner{max-width:1200px;margin:0 auto;padding:0 24px;height:100%;display:flex;align-items:center;gap:32px;}
.navbar-brand{display:flex;align-items:center;gap:10px;color:white;font-family:var(--font);font-size:18px;font-weight:600;white-space:nowrap;}
.navbar-brand strong{color:#60a5fa;}
.brand-icon{width:38px;height:38px;background:linear-gradient(135deg,var(--blue),var(--purple));border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:900;color:white;font-family:var(--font);flex-shrink:0;}
.brand-logo{width:42px;height:42px;border-radius:10px;object-fit:cover;flex-shrink:0;}
.navbar-links{display:flex;align-items:center;gap:4px;margin-left:auto;}
.navbar-links li a{color:rgba(255,255,255,.75);font-size:14px;font-weight:500;padding:7px 13px;border-radius:8px;transition:all .2s;}
.navbar-links li a:hover{color:white;background:rgba(255,255,255,.1);}
.nav-cta-btn{background:linear-gradient(135deg,var(--blue),var(--purple))!important;color:white!important;border-radius:8px!important;padding:7px 18px!important;font-weight:700!important;}
.nav-cta-btn:hover{opacity:.9;transform:translateY(-1px);}
.nav-admin-btn{color:#fbbf24!important;}
.nav-salir-btn{color:#f87171!important;}
.menu-toggle{display:none;background:none;border:none;color:white;font-size:22px;cursor:pointer;margin-left:auto;}

/* ── HERO ── */
.hero{min-height:100vh;background:linear-gradient(135deg,var(--navy) 0%,#1a1050 50%,#0d2060 100%);display:flex;align-items:center;justify-content:center;text-align:center;padding:calc(var(--navbar-h) + 40px) 24px 100px;position:relative;overflow:hidden;}
.hero::after{content:'';position:absolute;bottom:0;left:0;right:0;height:80px;background:var(--gray50);clip-path:ellipse(55% 100% at 50% 100%);}
.hero-shapes{position:absolute;inset:0;overflow:hidden;pointer-events:none;}
.shape{position:absolute;font-family:var(--font);font-weight:900;color:rgba(255,255,255,.04);animation:float 8s ease-in-out infinite;user-select:none;}
.s1{font-size:120px;top:8%;left:5%;animation-delay:0s;}
.s2{font-size:90px;top:60%;left:2%;animation-delay:1s;}
.s3{font-size:100px;top:20%;right:4%;animation-delay:2s;}
.s4{font-size:140px;top:50%;right:6%;animation-delay:.5s;}
.s5{font-size:80px;top:70%;left:20%;animation-delay:3s;}
.s6{font-size:110px;top:15%;left:40%;animation-delay:1.5s;}
.s7{font-size:95px;top:80%;right:20%;animation-delay:2.5s;}
.s8{font-size:75px;top:40%;left:14%;animation-delay:.8s;}
@keyframes float{0%,100%{transform:translateY(0) rotate(0deg);}50%{transform:translateY(-20px) rotate(5deg);}}
.hero-content{position:relative;z-index:1;max-width:780px;}
.hero-badge{display:inline-block;background:rgba(37,99,235,.3);border:1px solid rgba(96,165,250,.4);color:#93c5fd;font-size:13px;font-weight:600;padding:6px 16px;border-radius:100px;margin-bottom:24px;letter-spacing:.5px;}
.hero-title{font-family:var(--font);font-size:clamp(36px,6vw,72px);font-weight:900;color:white;line-height:1.1;margin-bottom:20px;letter-spacing:-1px;}
.hero-gradient{background:linear-gradient(135deg,#60a5fa,#a78bfa,#34d399);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;}
.hero-sub{font-size:clamp(15px,2vw,18px);color:rgba(255,255,255,.7);margin-bottom:36px;line-height:1.7;max-width:600px;margin-left:auto;margin-right:auto;}
.hero-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:48px;}
.btn-hero-main{display:inline-block;padding:16px 36px;background:linear-gradient(135deg,var(--blue),var(--purple));color:white;font-family:var(--font);font-size:16px;font-weight:700;border-radius:var(--radius);box-shadow:0 8px 32px rgba(37,99,235,.4);transition:all .25s;}
.btn-hero-main:hover{transform:translateY(-3px);box-shadow:0 14px 40px rgba(37,99,235,.5);}
.btn-hero-sec{display:inline-block;padding:16px 36px;background:rgba(255,255,255,.1);border:2px solid rgba(255,255,255,.25);color:white;font-family:var(--font);font-size:16px;font-weight:600;border-radius:var(--radius);transition:all .25s;}
.btn-hero-sec:hover{background:rgba(255,255,255,.2);transform:translateY(-3px);}
.hero-stats{display:flex;align-items:center;justify-content:center;gap:24px;flex-wrap:wrap;}
.hero-stat{text-align:center;}
.hero-stat strong{display:block;font-size:24px;font-weight:800;color:white;font-family:var(--font);}
.hero-stat span{font-size:12px;color:rgba(255,255,255,.55);font-weight:500;}
.hero-stat-sep{width:1px;height:36px;background:rgba(255,255,255,.15);}

/* Lista rápida de materias dentro de la sección */
.lista-materias-rapida {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-bottom: 36px;
    padding: 0;
    list-style: none;
}
.lista-materias-rapida li {
    list-style: none;
    margin: 0;
    padding: 0;
}
.lista-materias-rapida a {
    display: inline-block;
    background: var(--gray100);
    color: var(--blue);
    border: 2px solid var(--gray200);
    padding: 8px 20px;
    border-radius: 100px;
    font-size: 14px;
    font-weight: 700;
    font-family: var(--font);
    transition: all .2s;
    text-decoration: none;
}
.lista-materias-rapida a:hover {
    background: var(--blue);
    color: white;
    border-color: var(--blue);
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(37,99,235,.25);
}

/* Beneficios en modal de pago — texto oscuro legible */
.pago-panel .beneficios-lista {
    background: #f8fafc;
    border: 1.5px solid #e2e8f0;
}
.pago-panel .beneficios-lista li {
    color: #1e293b;
    font-size: 14px;
    padding: 6px 0;
}

/* ── BUSCADOR ── */
.buscador-wrap{background:white;padding:28px 24px 16px;border-bottom:1px solid var(--gray200);}
.buscador-inner{max-width:600px;margin:0 auto 16px;display:flex;align-items:center;background:var(--gray100);border:2px solid var(--gray200);border-radius:100px;padding:10px 20px;transition:border-color .2s;}
.buscador-inner:focus-within{border-color:var(--blue);background:white;}
.buscador-icon{font-size:18px;margin-right:12px;opacity:.5;}
#buscador{flex:1;border:none;background:transparent;font-family:var(--font-body);font-size:15px;color:var(--gray800);outline:none;}
#lista-contenidos{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;max-width:900px;margin:0 auto;}
#lista-contenidos a{display:inline-block;background:var(--gray100);color:var(--blue);border:1.5px solid var(--gray200);padding:6px 16px;border-radius:100px;font-size:13px;font-weight:600;transition:all .2s;}
#lista-contenidos a:hover{background:var(--blue);color:white;border-color:var(--blue);transform:translateY(-2px);}

/* ── SECCIONES BASE ── */
.section{padding:80px 24px;}
.section-alt{background:white;}
.section-inner{max-width:1200px;margin:0 auto;}
.section-header{text-align:center;margin-bottom:48px;}
.section-title{font-family:var(--font);font-size:clamp(26px,4vw,40px);font-weight:800;color:var(--navy);margin-bottom:10px;}
.section-title.light{color:white;}
.section-sub{font-size:16px;color:var(--gray400);font-weight:400;}
.section-sub.light{color:rgba(255,255,255,.65);}
.section-icon{width:56px;height:56px;border-radius:var(--radius);display:flex;align-items:center;justify-content:center;font-size:24px;font-weight:700;margin:0 auto 16px;}
.video-icon{background:linear-gradient(135deg,#ef4444,#dc2626);color:white;}
.pdf-icon{background:linear-gradient(135deg,#f59e0b,#d97706);color:white;}

/* ── MATERIAS GRID ── */
.materias-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.materia-card{border-radius:var(--radius-lg);overflow:hidden;background:white;box-shadow:var(--shadow);display:block;transition:transform .3s cubic-bezier(.34,1.56,.64,1),box-shadow .3s;cursor:pointer;text-decoration:none;color:inherit;border:1px solid var(--gray200);}
.materia-card:hover{transform:translateY(-8px) scale(1.02);box-shadow:var(--shadow-lg);}
.materia-img-wrap{position:relative;height:150px;overflow:hidden;}
.materia-img-wrap img{width:100%;height:100%;object-fit:cover;transition:transform .5s;}
.materia-card:hover .materia-img-wrap img{transform:scale(1.08);}
.materia-overlay{position:absolute;inset:0;opacity:.7;transition:opacity .3s;}
.materia-card:hover .materia-overlay{opacity:.88;}
.materia-emoji{position:absolute;bottom:10px;right:12px;font-size:28px;font-family:var(--font);font-weight:900;color:white;text-shadow:0 2px 8px rgba(0,0,0,.3);z-index:1;}
.materia-info{padding:16px;display:flex;flex-direction:column;gap:4px;}
.materia-info h3{font-family:var(--font);font-size:16px;font-weight:700;color:var(--navy);}
.materia-info p{font-size:12px;color:var(--gray400);line-height:1.4;}
.materia-arrow{font-size:16px;font-weight:700;margin-top:4px;transition:transform .2s;display:inline-block;}
.materia-card:hover .materia-arrow{transform:translateX(4px);}
[data-color="purple"] .materia-overlay{background:linear-gradient(180deg,transparent 30%,#7c3aed);}
[data-color="purple"] .materia-arrow{color:var(--purple);}
[data-color="blue"]   .materia-overlay{background:linear-gradient(180deg,transparent 30%,#1d4ed8);}
[data-color="blue"]   .materia-arrow{color:var(--blue);}
[data-color="teal"]   .materia-overlay{background:linear-gradient(180deg,transparent 30%,#0d9488);}
[data-color="teal"]   .materia-arrow{color:var(--teal);}
[data-color="orange"] .materia-overlay{background:linear-gradient(180deg,transparent 30%,#ea580c);}
[data-color="orange"] .materia-arrow{color:var(--orange);}
[data-color="red"]    .materia-overlay{background:linear-gradient(180deg,transparent 30%,#b91c1c);}
[data-color="red"]    .materia-arrow{color:var(--red);}
[data-color="indigo"] .materia-overlay{background:linear-gradient(180deg,transparent 30%,#4338ca);}
[data-color="indigo"] .materia-arrow{color:var(--indigo);}
[data-color="green"]  .materia-overlay{background:linear-gradient(180deg,transparent 30%,#15803d);}
[data-color="green"]  .materia-arrow{color:var(--green);}
[data-color="pink"]   .materia-overlay{background:linear-gradient(180deg,transparent 30%,#be185d);}
[data-color="pink"]   .materia-arrow{color:var(--pink);}

/* ── EJERCICIOS ── */
.ejercicio{background:white;border:1.5px solid var(--gray200);border-left:5px solid var(--blue);border-radius:var(--radius);padding:22px 26px;margin-bottom:16px;text-align:center;transition:box-shadow .2s;}
.ejercicio:hover{box-shadow:var(--shadow);}
.ejercicio h3{font-family:var(--font);font-size:13px;font-weight:700;color:var(--blue);margin-bottom:8px;text-transform:uppercase;letter-spacing:.5px;}
.ejercicio p{font-size:22px;font-weight:700;font-family:var(--font);color:var(--navy);margin-bottom:14px;}
.ejercicio input{padding:10px 18px;border:2px solid var(--gray200);border-radius:100px;font-size:16px;font-family:var(--font-body);text-align:center;outline:none;transition:border-color .2s;width:140px;}
.ejercicio input:focus{border-color:var(--blue);}
.boton-verificar{display:inline-block;margin:10px 0 0 10px;padding:10px 22px;background:var(--blue);color:white;border:none;border-radius:100px;font-size:14px;font-weight:600;font-family:var(--font);cursor:pointer;transition:all .2s;}
.boton-verificar:hover{background:var(--blue2);transform:translateY(-2px);}
.resultado{font-size:15px;font-weight:700;margin-top:10px;min-height:22px;}
.boton-solucion{display:block;margin:24px auto 0;padding:12px 28px;background:linear-gradient(135deg,var(--green),#15803d);color:white;border:none;border-radius:100px;font-size:15px;font-weight:700;font-family:var(--font);cursor:pointer;transition:all .25s;box-shadow:0 4px 16px rgba(22,163,74,.3);}
.boton-solucion:hover{transform:translateY(-3px);box-shadow:0 8px 24px rgba(22,163,74,.4);}

/* ── CONTENIDO GRID ── */
.contenido-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:20px;}
.pub-card{background:white;border:1.5px solid var(--gray200);border-radius:var(--radius-lg);padding:16px;display:flex;flex-direction:column;gap:10px;transition:transform .25s,box-shadow .25s;box-shadow:0 2px 8px rgba(0,0,0,.05);}
.pub-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);}
.pub-card-premium{border-color:#fcd34d;background:linear-gradient(180deg,#fffbeb 0%,white 100%);}
.pub-card-titulo{font-family:var(--font);font-size:15px;font-weight:700;color:var(--navy);}
.pub-card-desc{font-size:12px;color:var(--gray400);line-height:1.5;}
.card-bloqueada{opacity:.5;pointer-events:none;}
.bloqueado-txt{font-size:12px;color:var(--gray400);}
.bloqueado-wrap{display:flex;flex-direction:column;gap:6px;margin-top:auto;}
.btn-ver{margin-top:auto;display:inline-block;padding:9px 16px;background:linear-gradient(135deg,var(--blue),var(--blue2));color:white;border:none;border-radius:8px;font-size:13px;font-weight:600;font-family:var(--font);cursor:pointer;transition:all .2s;text-align:center;}
.btn-ver:hover{opacity:.9;transform:translateY(-2px);}
.btn-premium-ver{background:linear-gradient(135deg,var(--gold),#d97706);}
.estado-vacio-pub{color:var(--gray400);font-size:14px;font-style:italic;grid-column:1/-1;}
.mini-img{width:100%;height:120px;object-fit:cover;border-radius:10px;border:1px solid var(--gray200);}
.mini-icono{height:90px;display:flex;align-items:center;justify-content:center;font-size:40px;background:var(--gray100);border-radius:10px;}
.mini-texto{background:var(--gray100);border-radius:10px;padding:10px;font-size:11px;color:var(--gray400);max-height:80px;overflow:hidden;line-height:1.5;}

/* ── PREMIUM SECTION ── */
.premium-section{background:linear-gradient(135deg,var(--navy) 0%,#1a0a50 50%,var(--navy2) 100%);}
.premium-landing{max-width:580px;margin:0 auto;text-align:center;}
.premium-landing-header{margin-bottom:24px;}
.premium-landing-header h3{font-family:var(--font);font-size:22px;font-weight:800;color:white;margin:12px 0 6px;}
.precio-tag{display:inline-flex;align-items:baseline;gap:6px;}
.precio-monto{font-family:var(--font);font-size:40px;font-weight:900;color:#fbbf24;}
.precio-moneda{font-size:16px;color:rgba(255,255,255,.6);}
.beneficios-lista{list-style:none;padding:20px 24px;margin:0 0 24px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);border-radius:var(--radius);text-align:left;}
.beneficios-lista li{padding:6px 0;font-size:14px;color:rgba(255,255,255,.85);}
.btns-pago-wrap{display:flex;flex-direction:column;gap:10px;align-items:center;}
.btn-premium{display:inline-block;padding:14px 36px;background:linear-gradient(135deg,var(--blue),var(--purple));color:white;border:none;border-radius:var(--radius);font-family:var(--font);font-size:16px;font-weight:700;cursor:pointer;transition:all .25s;box-shadow:0 6px 24px rgba(37,99,235,.4);}
.btn-premium:hover{transform:translateY(-3px);opacity:.95;}
.cuota-info{margin-bottom:20px;}
.cuota-texto{font-size:14px;color:rgba(255,255,255,.8);margin-bottom:8px;}
.cuota-barra{height:8px;background:rgba(255,255,255,.15);border-radius:100px;overflow:hidden;max-width:300px;}
.cuota-barra-fill{height:100%;background:linear-gradient(90deg,var(--blue),var(--purple));border-radius:100px;transition:width .5s;}
.cuota-alerta{font-size:13px;color:#fca5a5;margin-top:8px;}
.estado-suscripcion{display:flex;align-items:center;gap:14px;border-radius:var(--radius);padding:16px 20px;margin-bottom:20px;flex-wrap:wrap;}
.estado-activa{background:linear-gradient(135deg,rgba(37,99,235,.3),rgba(124,58,237,.3));border:1px solid rgba(96,165,250,.4);color:white;}
.estado-inactiva{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);color:rgba(255,255,255,.85);justify-content:space-between;}
.badge-activa-pill{background:rgba(255,255,255,.15);color:white;padding:4px 14px;border-radius:100px;font-size:12px;font-weight:700;letter-spacing:.5px;white-space:nowrap;}

/* ── FOOTER ── */
.footer{background:var(--navy);border-top:1px solid rgba(255,255,255,.06);padding:40px 24px;}
.footer-inner{max-width:1200px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;}
.footer-brand{display:flex;align-items:center;gap:10px;color:white;font-family:var(--font);font-size:16px;font-weight:600;}
.footer-brand strong{color:#60a5fa;}
.footer-copy{font-size:13px;color:rgba(255,255,255,.4);}
.footer-links{display:flex;gap:20px;}
.footer-links a{font-size:13px;color:rgba(255,255,255,.5);transition:color .2s;}
.footer-links a:hover{color:white;}

/* ── OVERLAYS ── */
.overlay{position:fixed;inset:0;background:rgba(0,0,0,.6);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:1000;padding:16px;}
.overlay-panel{background:white;border-radius:var(--radius-lg);padding:32px;width:100%;max-width:440px;max-height:92vh;overflow-y:auto;position:relative;box-shadow:var(--shadow-lg);}
.overlay-close{position:absolute;top:14px;right:14px;background:var(--gray100);border:none;border-radius:8px;width:32px;height:32px;cursor:pointer;font-size:15px;color:var(--gray600);display:flex;align-items:center;justify-content:center;transition:background .2s;}
.overlay-close:hover{background:var(--gray200);color:var(--navy);}

/* ── AUTH ── */
.auth-logo-sym{width:64px;height:64px;background:linear-gradient(135deg,var(--blue),var(--purple));border-radius:18px;display:flex;align-items:center;justify-content:center;font-size:30px;font-weight:900;color:white;font-family:var(--font);margin:0 auto 16px;}
.auth-logo{font-size:40px;text-align:center;margin-bottom:8px;}
.overlay-panel h2{font-family:var(--font);font-size:22px;font-weight:800;text-align:center;color:var(--navy);margin-bottom:6px;}
.form-group{margin-bottom:16px;}
.form-group label{display:block;font-size:13px;font-weight:600;color:var(--gray600);margin-bottom:6px;}
.form-group input,.form-group textarea,.form-group select{width:100%;padding:11px 14px;border:2px solid var(--gray200);border-radius:var(--radius);font-size:14px;font-family:var(--font-body);color:var(--navy);background:var(--gray50);box-sizing:border-box;transition:border-color .2s,background .2s;}
.form-group input:focus,.form-group textarea:focus,.form-group select:focus{outline:none;border-color:var(--blue);background:white;box-shadow:0 0 0 4px rgba(37,99,235,.08);}
.form-error{color:#dc2626;font-size:13px;background:#fef2f2;border-radius:8px;padding:8px 12px;margin-bottom:10px;display:none;border-left:3px solid #dc2626;}
.form-success{color:#16a34a;font-size:13px;background:#f0fdf4;border-radius:8px;padding:8px 12px;margin-bottom:10px;display:none;border-left:3px solid #16a34a;}
.btn-auth{width:100%;padding:13px;border:none;border-radius:var(--radius);font-size:15px;font-weight:700;cursor:pointer;margin-bottom:10px;font-family:var(--font);transition:all .2s;}
.btn-primary{background:linear-gradient(135deg,var(--blue),var(--blue2));color:white;box-shadow:0 4px 16px rgba(37,99,235,.3);}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(37,99,235,.4);}
.btn-secondary{background:var(--gray100);color:var(--navy);border:2px solid var(--gray200);}
.btn-secondary:hover{background:var(--gray200);}
.back-btn{background:none;border:none;color:var(--blue);font-size:13px;font-weight:600;cursor:pointer;margin-bottom:16px;padding:0;font-family:var(--font-body);}

/* ── ADMIN ── */
.admin-panel{max-width:760px;}
.admin-header{display:flex;align-items:center;gap:14px;margin-bottom:20px;padding-bottom:16px;border-bottom:2px solid var(--gray100);}
.admin-logo{font-size:30px;}
.admin-tabs{display:flex;gap:6px;margin-bottom:20px;flex-wrap:wrap;}
.admin-tab{padding:8px 18px;border-radius:10px;border:2px solid var(--gray200);background:transparent;cursor:pointer;font-size:13px;font-weight:700;color:var(--gray400);font-family:var(--font);transition:all .2s;}
.admin-tab.active{background:linear-gradient(135deg,var(--blue),var(--purple));color:white;border-color:transparent;}
.admin-tab:hover:not(.active){background:var(--gray100);color:var(--navy);}
.tab-toolbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;flex-wrap:wrap;gap:8px;}
.tab-toolbar select{padding:7px 12px;border-radius:8px;border:2px solid var(--gray200);font-size:13px;background:white;}
.admin-grid{display:flex;flex-wrap:wrap;gap:14px;max-height:55vh;overflow-y:auto;}
.admin-card{background:var(--gray50);border:1.5px solid var(--gray200);border-radius:var(--radius);padding:14px;width:180px;display:flex;flex-direction:column;gap:7px;}
.admin-card-titulo{font-size:13px;font-weight:700;color:var(--navy);}
.admin-card-desc,.admin-card-meta{font-size:11px;color:var(--gray400);}
.admin-card-acciones{display:flex;gap:5px;flex-wrap:wrap;margin-top:auto;}
.btn-accion{background:var(--blue);color:white;border:none;padding:5px 10px;border-radius:6px;cursor:pointer;font-size:11px;font-weight:600;font-family:var(--font);transition:all .2s;}
.btn-accion:hover{background:var(--blue2);}
.btn-eliminar{background:#dc2626;}
.btn-eliminar:hover{background:#b91c1c;}
.badge-seccion{display:inline-block;font-size:11px;font-weight:700;padding:3px 8px;border-radius:6px;}
.badge-video{background:#fef3c7;color:#92400e;}
.badge-pdf{background:#fee2e2;color:#991b1b;}
.badge-premium{background:#fefce8;color:#854d0e;}
.badge-imagen{background:#dcfce7;color:#166534;}
.badge-texto{background:#ede9fe;color:#5b21b6;}
.badge-materia{display:inline-block;font-size:11px;font-weight:600;padding:3px 8px;border-radius:6px;background:#dbeafe;color:#1e40af;}
.subir-form{max-width:540px;}
.btn-subir{width:100%;padding:13px;background:linear-gradient(135deg,var(--green),#15803d);color:white;border:none;border-radius:var(--radius);font-size:15px;font-weight:700;font-family:var(--font);cursor:pointer;margin-top:6px;transition:all .25s;box-shadow:0 4px 16px rgba(22,163,74,.3);}
.btn-subir:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(22,163,74,.4);}
.btn-cancelar{padding:13px 20px;background:var(--gray100);color:var(--navy);border:2px solid var(--gray200);border-radius:var(--radius);font-size:14px;cursor:pointer;font-family:var(--font);}
.progress-bar-wrap{height:6px;background:var(--gray200);border-radius:100px;overflow:hidden;}
.progress-bar-fill{height:100%;background:linear-gradient(90deg,var(--blue),var(--purple));border-radius:100px;transition:width .2s;}
.estado-vacio{color:var(--gray400);font-size:14px;font-style:italic;text-align:center;padding:24px;width:100%;}
.admin-stats-row{display:flex;gap:12px;margin-bottom:20px;flex-wrap:wrap;}
.admin-stat{flex:1;min-width:90px;background:var(--gray50);border:2px solid var(--gray200);border-radius:var(--radius);padding:14px;text-align:center;}
.admin-stat-premium{background:#fffbeb;border-color:#fcd34d;}
.stat-num{display:block;font-size:26px;font-weight:900;font-family:var(--font);color:var(--blue);}
.admin-stat-premium .stat-num{color:#92400e;}
.stat-lbl{display:block;font-size:11px;color:var(--gray400);margin-top:2px;font-weight:600;}
.usuario-fila-ext{display:flex;align-items:center;gap:12px;padding:14px 0;border-bottom:1px solid var(--gray100);flex-wrap:wrap;}
.usuario-fila-ext:last-child{border-bottom:none;}
.usuario-acciones{display:flex;gap:6px;flex-wrap:wrap;align-items:center;flex-shrink:0;}
.usuario-avatar{width:40px;height:40px;background:linear-gradient(135deg,var(--blue),var(--purple));color:white;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:16px;font-family:var(--font);flex-shrink:0;}
.avatar-premium{background:linear-gradient(135deg,var(--gold),#d97706)!important;}
.badge-premium-activo{display:inline-block;font-size:11px;font-weight:700;padding:3px 10px;border-radius:100px;background:#fefce8;color:#854d0e;border:1px solid #fcd34d;}
.badge-premium-vencida{display:inline-block;font-size:11px;font-weight:700;padding:3px 10px;border-radius:100px;background:#fff7ed;color:#9a3412;border:1px solid #fdba74;}
.badge-plan-free{display:inline-block;font-size:11px;padding:3px 10px;border-radius:100px;background:var(--gray100);color:var(--gray400);}
.btn-activar{background:linear-gradient(135deg,var(--green),#15803d);color:white;border:none;padding:7px 14px;border-radius:8px;cursor:pointer;font-size:12px;font-weight:700;font-family:var(--font);white-space:nowrap;transition:all .2s;}
.btn-activar:hover{transform:translateY(-1px);}
.btn-renovar{background:linear-gradient(135deg,var(--blue),var(--blue2));color:white;border:none;padding:7px 14px;border-radius:8px;cursor:pointer;font-size:12px;font-weight:700;font-family:var(--font);white-space:nowrap;}
.btn-renovar:hover{transform:translateY(-1px);}
.btn-desactivar{background:var(--gray100);color:#dc2626;border:2px solid #fecaca;padding:7px 10px;border-radius:8px;cursor:pointer;font-size:12px;font-family:var(--font);}
.btn-desactivar:hover{background:#fee2e2;}
.cuota-mini-bar{height:5px;background:var(--gray200);border-radius:100px;overflow:hidden;width:100px;margin-top:5px;}
.cuota-mini-fill{height:100%;background:linear-gradient(90deg,var(--blue),var(--purple));border-radius:100px;}

/* ── ESTADÍSTICAS (admin) ── */
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:12px;margin-bottom:24px;}
.stat-card{background:var(--gray50);border:2px solid var(--gray200);border-radius:var(--radius);padding:14px;}
.stat-label{font-size:12px;font-weight:700;color:var(--gray400);margin:0 0 4px;}
.stat-value{font-size:22px;font-weight:900;font-family:var(--font);color:var(--blue);margin:0;}
.stat-sub{font-size:11px;color:var(--gray400);margin:4px 0 0;}
.stats-subtitulo{font-size:14px;font-weight:800;color:var(--navy);margin:20px 0 10px;}
.stats-cols{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
.stats-lista{margin:0;padding-left:20px;font-size:13px;color:var(--navy);line-height:1.9;}
.stats-vacio{font-size:13px;color:var(--gray400);font-style:italic;padding:8px 0;}
.stats-tabla-wrap{overflow-x:auto;max-height:320px;overflow-y:auto;border:1px solid var(--gray200);border-radius:var(--radius);}
.stats-tabla{width:100%;border-collapse:collapse;font-size:12px;}
.stats-tabla th{background:var(--gray50);text-align:left;padding:8px 10px;font-weight:700;color:var(--gray400);position:sticky;top:0;}
.stats-tabla td{padding:8px 10px;border-top:1px solid var(--gray100);color:var(--navy);}
@media (max-width:640px){ .stats-cols{grid-template-columns:1fr;} }

/* ── VISOR ── */
.visor-panel{max-width:860px;}
.visor-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px;padding-bottom:14px;border-bottom:2px solid var(--gray100);}
.visor-header h3{font-family:var(--font);font-size:18px;font-weight:800;color:var(--navy);flex:1;padding-right:16px;}
.visor-texto{background:var(--gray50);border-radius:var(--radius);padding:20px;font-size:14px;line-height:1.8;white-space:pre-wrap;max-height:65vh;overflow-y:auto;border:1px solid var(--gray200);}

/* ── PAGO ── */
.pago-panel{max-width:520px;}
.pago-header{text-align:center;margin-bottom:20px;}
.pago-header h2{font-family:var(--font);font-size:24px;font-weight:800;color:var(--navy);margin:10px 0 6px;}
.precio-grande{font-family:var(--font);font-size:36px;font-weight:900;color:var(--blue);}
.precio-sub{font-size:16px;color:var(--gray400);font-weight:500;}
.btn-pago-mp{display:flex;align-items:center;justify-content:center;gap:10px;background:#009ee3;color:white;border-radius:var(--radius);padding:15px 20px;font-size:16px;font-weight:700;font-family:var(--font);width:100%;margin-bottom:10px;text-decoration:none;transition:all .2s;box-shadow:0 4px 16px rgba(0,158,227,.3);}
.btn-pago-mp:hover{background:#0082be;transform:translateY(-2px);}
.btn-pago-nx{display:flex;align-items:center;justify-content:center;gap:10px;background:#ff6600;color:white;border-radius:var(--radius);padding:15px 20px;font-size:16px;font-weight:700;font-family:var(--font);width:100%;margin-bottom:20px;text-decoration:none;transition:all .2s;box-shadow:0 4px 16px rgba(255,102,0,.3);}
.btn-pago-nx:hover{background:#d95500;transform:translateY(-2px);}
.btn-sm-pago{padding:8px 14px!important;font-size:12px!important;width:auto!important;white-space:nowrap;margin-bottom:0!important;}
.pago-instrucciones{background:#fffbeb;border:1px solid #fde68a;border-radius:var(--radius);padding:16px 18px;font-size:13px;color:#78350f;}
.pago-instrucciones ol{margin:0;padding-left:18px;line-height:2;}

/* ── RESPONSIVE ── */
@media(max-width:1100px){.materias-grid{grid-template-columns:repeat(3,1fr);}}
@media(max-width:820px){
    .materias-grid{grid-template-columns:repeat(2,1fr);}
    .menu-toggle{display:block;margin-left:auto;}
    .navbar-links{display:none;position:absolute;top:var(--navbar-h);left:0;right:0;background:var(--navy2);flex-direction:column;padding:12px;gap:4px;border-bottom:1px solid rgba(255,255,255,.08);max-height:calc(100vh - var(--navbar-h));overflow-y:auto;}
    .navbar-links.open{display:flex;}
    .navbar-links li{width:100%;}
    .navbar-links li a{display:block;padding:11px 16px;border-radius:8px;font-size:15px;}
    .nav-puntos{margin:6px 0!important;align-self:center;}
    .hero-stats{gap:16px;}
    .footer-inner{flex-direction:column;text-align:center;}
}
@media(max-width:520px){
    .materias-grid{grid-template-columns:1fr 1fr;gap:12px;}
    .section{padding:56px 16px;}
    .contenido-grid{grid-template-columns:1fr 1fr;}
    .admin-card{width:100%;}
    .overlay-panel{padding:20px 16px;}
}
/* ── BENEFICIOS EN MODAL DE PAGO (fondo blanco → texto oscuro) ── */
.pago-panel .beneficios-lista{background:#f8fafc;border:1.5px solid #e2e8f0;}
.pago-panel .beneficios-lista li{color:#1e293b;font-size:14px;}

/* ── UTILIDAD: solo lectores de pantalla ── */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;}

@media(max-width:520px){.lista-materias-rapida a{font-size:12px;padding:6px 14px;}}
@media(max-width:380px){.materias-grid{grid-template-columns:1fr;}.contenido-grid{grid-template-columns:1fr;}}


/* === NAVBAR OVERRIDE === */
.navbar{position:fixed;top:0;left:0;right:0;z-index:900;height:var(--navbar-h);background:rgba(15,23,42,.95);backdrop-filter:blur(14px);border-bottom:1px solid rgba(255,255,255,.07);}
.navbar-inner{max-width:1280px;margin:0 auto;padding:0 20px;height:100%;display:flex;align-items:center;gap:20px;}
.navbar-brand{display:flex;align-items:center;gap:8px;color:white;font-family:var(--font);font-size:17px;font-weight:600;white-space:nowrap;flex-shrink:0;}
.navbar-brand strong{color:#60a5fa;}
.brand-icon{font-size:24px;background:linear-gradient(135deg,var(--blue),var(--purple));-webkit-background-clip:text;background-clip:text;color:transparent;}
.navbar-links{display:flex;align-items:center;gap:2px;margin-left:auto;flex-wrap:nowrap;}
.navbar-links li a{display:inline-block;color:rgba(255,255,255,.75);font-size:13px;font-weight:500;padding:6px 10px;border-radius:8px;transition:all .2s;white-space:nowrap;}
.navbar-links li a:hover{color:white;background:rgba(255,255,255,.1);}
.nav-cta-btn{background:linear-gradient(135deg,var(--blue),var(--purple))!important;color:white!important;border-radius:8px!important;padding:6px 14px!important;font-weight:700!important;font-size:13px!important;}
.nav-cta-btn:hover{opacity:.9;transform:translateY(-1px);}
.nav-admin-btn{color:#fbbf24!important;}
.nav-salir-btn{color:#f87171!important;}
.nav-icon-btn{padding:6px 8px!important;font-size:16px!important;}
.menu-toggle{display:none;background:none;border:none;color:white;font-size:22px;cursor:pointer;padding:6px 10px;border-radius:8px;}
.menu-toggle:hover{background:rgba(255,255,255,.08);}
/* === Navbar responsive: activar hamburger en tablets también === */
@media (max-width: 1024px) {
    .menu-toggle{display:block;margin-left:auto;}
    .navbar-links{display:none;position:absolute;top:var(--navbar-h);left:0;right:0;background:var(--navy2);flex-direction:column;padding:12px;gap:4px;border-bottom:1px solid rgba(255,255,255,.08);max-height:calc(100vh - var(--navbar-h));overflow-y:auto;z-index:899;}
    .navbar-links.open{display:flex;}
    .navbar-links li{width:100%;}
    .navbar-links li a{display:block;padding:11px 16px;border-radius:8px;font-size:15px;}
    .nav-puntos{margin:6px 0!important;align-self:flex-start!important;display:inline-flex!important;}
}

/* === FAB DE CONTACTO === */
.fab-contacto{position:fixed;bottom:24px;right:24px;width:60px;height:60px;border-radius:50%;background:linear-gradient(135deg,#25d366,#128c7e);color:white;border:none;font-size:28px;cursor:pointer;box-shadow:0 8px 24px rgba(37,211,102,.4);z-index:800;display:flex;align-items:center;justify-content:center;transition:transform .2s,box-shadow .2s;}
.fab-contacto:hover{transform:scale(1.08);box-shadow:0 12px 32px rgba(37,211,102,.55);}
.fab-contacto.abierto{transform:rotate(45deg);background:linear-gradient(135deg,#64748b,#475569);}
.fab-menu{position:fixed;bottom:96px;right:24px;background:white;border-radius:14px;box-shadow:0 16px 48px rgba(0,0,0,.18);padding:14px;width:280px;z-index:801;display:none;animation:fabIn .2s ease-out;}
.fab-menu.open{display:block;}
@keyframes fabIn{from{opacity:0;transform:translateY(10px);}to{opacity:1;transform:translateY(0);}}
.fab-menu h4{margin:0 0 8px;font-size:14px;color:#0f172a;font-weight:700;}
.fab-menu p{margin:0 0 12px;font-size:12px;color:#64748b;}
.fab-opcion{display:flex;align-items:center;gap:12px;padding:12px 14px;background:#f8fafc;border-radius:10px;margin-bottom:8px;text-decoration:none;color:#0f172a;font-size:14px;font-weight:600;transition:all .15s;cursor:pointer;border:1px solid transparent;}
.fab-opcion:hover{background:white;border-color:#e2e8f0;transform:translateX(2px);}
.fab-opcion.wa{background:linear-gradient(135deg,#25d366,#128c7e);color:white;}
.fab-opcion.wa:hover{background:linear-gradient(135deg,#128c7e,#075e54);}
.fab-opcion.ig{background:linear-gradient(135deg,#f58529,#dd2a7b,#8134af);color:white;}
.fab-opcion.ig:hover{opacity:.92;}
.fab-opcion-icon{font-size:24px;line-height:1;}
@media (max-width: 600px) {
    .fab-contacto{width:54px;height:54px;font-size:24px;bottom:18px;right:18px;}
    .fab-menu{bottom:84px;right:18px;width:calc(100vw - 36px);max-width:300px;}
}

/* === CARDS DE 3 PLANES === */
.planes-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:8px;}
.plan-card{background:white;border:2px solid #e2e8f0;border-radius:14px;padding:24px 18px;position:relative;display:flex;flex-direction:column;transition:transform .2s,border-color .2s;}
.plan-card:hover{transform:translateY(-4px);}
.plan-card-popular{border-color:#2563eb;transform:scale(1.02);box-shadow:0 8px 24px rgba(37,99,235,.18);}
.plan-card-popular:hover{transform:scale(1.02) translateY(-4px);}
.plan-card-premium{border-color:#f59e0b;background:linear-gradient(180deg,#fffbeb 0%,white 60%);}
.plan-tag{position:absolute;top:-12px;left:50%;transform:translateX(-50%);color:white;font-size:11px;font-weight:700;padding:4px 14px;border-radius:99px;letter-spacing:1px;white-space:nowrap;}
.plan-card h3{font-size:18px;margin:8px 0 4px;color:#0f172a;text-align:center;font-weight:700;}
.plan-precio{font-size:32px;font-weight:900;text-align:center;color:#0f172a;margin:6px 0 2px;font-family:var(--font);}
.plan-sub{font-size:12px;color:#64748b;text-align:center;margin:0 0 16px;}
.plan-features{list-style:none;padding:0;margin:0 0 18px;flex:1;}
.plan-features li{padding:5px 0;font-size:13px;color:#334155;border-bottom:1px solid #f1f5f9;}
.plan-features li:last-child{border-bottom:none;}
.plan-btn{display:block;width:100%;padding:11px;border:none;border-radius:10px;font-size:14px;font-weight:700;cursor:pointer;text-align:center;text-decoration:none;color:white;transition:all .2s;}
.plan-btn-gratis{background:#cbd5e1;color:#475569;cursor:not-allowed;}
.plan-btn-basico{background:linear-gradient(135deg,#2563eb,#7c3aed);}
.plan-btn-basico:hover{opacity:.9;transform:translateY(-1px);}
.plan-btn-premium{background:linear-gradient(135deg,#f59e0b,#dc2626);}
.plan-btn-premium:hover{opacity:.9;transform:translateY(-1px);}
@media (max-width:780px){.planes-grid{grid-template-columns:1fr;}.plan-card-popular{transform:none;}.plan-card-popular:hover{transform:translateY(-4px);}}

/* === BANNER DE QUOTA EXCEDIDA === */
.quota-banner{background:linear-gradient(135deg,#fef3c7,#fde68a);border:1px solid #f59e0b;border-radius:12px;padding:16px 20px;margin:16px 0;text-align:center;}
.quota-banner h4{margin:0 0 6px;color:#92400e;font-size:15px;}
.quota-banner p{margin:0 0 10px;color:#78350f;font-size:13px;}

/* === SECCIÓN PREMIUM en la home (sobre fondo oscuro) === */
.premium-section{background:linear-gradient(135deg,#1e1b4b 0%,#312e81 50%,#1e293b 100%);}
.premium-section .section-title{color:white!important;}
.premium-section .section-sub{color:rgba(255,255,255,.75)!important;}
.premium-section .section-title.light{color:white!important;}
.premium-section .section-sub.light{color:rgba(255,255,255,.75)!important;}
.premium-section .cuota-info{color:rgba(255,255,255,.85);text-align:center;margin-bottom:18px;font-size:14px;background:rgba(255,255,255,.05);padding:10px;border-radius:8px;}
.premium-section .cuota-info strong{color:#fbbf24;}

/* Banner de estado del usuario */
.premium-banner-estado{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:14px;padding:18px 22px;margin-bottom:24px;text-align:center;backdrop-filter:blur(8px);}
.banner-activo{background:linear-gradient(135deg,rgba(245,158,11,.18),rgba(220,38,38,.18));border-color:rgba(245,158,11,.4);}
.banner-gratis{background:rgba(251,191,36,.08);border-color:rgba(251,191,36,.25);}

/* Planes en la home (sobre fondo oscuro, asegurar contraste) */
.planes-home{margin-top:8px;}
.planes-home .plan-card{background:white;color:#0f172a;}
.planes-home .plan-card h3{color:#0f172a;}
.planes-home .plan-precio{color:#0f172a;}
.planes-home .plan-sub{color:#475569;}
.planes-home .plan-features li{color:#334155;}

/* Sobreescribir oscuridad del texto "Aún no hay contenido premium" */
.premium-section #premium-grid p{color:rgba(255,255,255,.6)!important;}


/* === Marca de agua disuasiva en archivos admin === */
.con-marca-agua .visor-panel { position: relative; }
.con-marca-agua .visor-panel::before {
    content: attr(data-watermark);
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    color: rgba(220, 38, 38, 0.12);
    font-size: 18px; font-weight: 700;
    transform: rotate(-25deg);
    pointer-events: none; z-index: 10;
    background-image:
        repeating-linear-gradient(-30deg,
            transparent 0, transparent 120px,
            rgba(0,0,0,0.02) 121px, rgba(0,0,0,0.02) 240px);
    text-shadow: 0 0 20px rgba(255,255,255,0.6);
}
.con-marca-agua #modal-visor[style*="display: flex"]::after {
    content: attr(data-watermark);
}
.con-marca-agua [id^="modal-visor"]::after { display:none; }
#modal-visor.con-marca-agua > .overlay-panel { position: relative; }
#modal-visor.con-marca-agua > .overlay-panel::after {
    content: "© Matemáticas Activas";
    position: absolute; top: 50%; left: 50%;
    transform: translate(-50%,-50%) rotate(-25deg);
    font-size: 48px; font-weight: 900;
    color: rgba(220, 38, 38, 0.07);
    pointer-events: none; z-index: 5;
}

/* === Bloquear impresión de cualquier modal visor === */
@media print {
    #modal-visor, #modal-editar, #overlay-admin, #overlay-auth { display: none !important; }
    body::before {
        content: "🔒 Este contenido no está disponible para impresión";
        display: block; padding: 40px; text-align: center;
        font-size: 24px; color: #dc2626; font-weight: 700;
    }
}

/* ===== Buscador integrado en la navbar ===== */
.navbar-search{position:relative;display:flex;align-items:center;background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.18);border-radius:99px;padding:6px 12px;gap:8px;min-width:240px;max-width:340px;flex:1 1 260px;transition:background .15s,border-color .15s}
.navbar-search:focus-within{background:rgba(255,255,255,.18);border-color:rgba(255,255,255,.42)}
.navbar-search-icon{font-size:13px;opacity:.85}
.navbar-search input{flex:1;background:transparent;border:none;outline:none;color:white;font-size:13px;font-family:inherit;min-width:0}
.navbar-search input::placeholder{color:rgba(255,255,255,.55)}
.buscador-resultados.nav{position:absolute;top:calc(100% + 8px);left:0;right:0;background:white;color:#0f172a;border:1px solid #e2e8f0;border-radius:12px;box-shadow:0 12px 28px rgba(0,0,0,.18);max-height:60vh;overflow-y:auto;z-index:1500}
@media (max-width:900px){
    .navbar-search{order:3;width:100%;min-width:0;max-width:none;margin-top:6px}
    .buscador-resultados.nav{left:8px;right:8px}
}

/* ===== Footer contacto (WhatsApp + Instagram) ===== */
.footer-contacto{display:flex;flex-wrap:wrap;gap:14px;align-items:center;justify-content:center}
.footer-contacto-link{display:inline-flex;align-items:center;gap:8px;padding:8px 14px;border-radius:99px;font-size:13px;font-weight:600;color:white;text-decoration:none;transition:transform .15s,box-shadow .15s}
.footer-contacto-link.wa{background:linear-gradient(135deg,#25d366,#128c7e)}
.footer-contacto-link.ig{background:linear-gradient(135deg,#f58529,#dd2a7b,#8134af)}
.footer-contacto-link:hover{transform:translateY(-2px);box-shadow:0 8px 18px rgba(0,0,0,.25);color:white}

/* ===== Modal de subtema con PDFs por plan ===== */
.subtema-overlay{position:fixed;inset:0;background:rgba(15,23,42,.65);display:none;align-items:flex-start;justify-content:center;z-index:9000;padding:24px 12px;overflow-y:auto}
.subtema-overlay.activo{display:flex}
.subtema-panel{background:white;border-radius:18px;max-width:780px;width:100%;padding:28px 28px 24px;box-shadow:0 24px 60px rgba(0,0,0,.35);position:relative}
.subtema-close{position:absolute;top:14px;right:18px;background:transparent;border:none;font-size:24px;color:#94a3b8;cursor:pointer;line-height:1}
.subtema-close:hover{color:#dc2626}
.subtema-eyebrow{font-size:11px;font-weight:700;letter-spacing:.05em;color:#2563eb;text-transform:uppercase;margin-bottom:6px}
.subtema-titulo{font-size:24px;font-weight:800;color:#0f172a;margin:0 0 8px;line-height:1.2}
.subtema-desc{font-size:14px;color:#475569;line-height:1.55;margin:0 0 18px}
.subtema-archivos-titulo{font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:#334155;margin:6px 0 10px;border-top:1px solid #e2e8f0;padding-top:14px}
.subtema-archivos{display:grid;grid-template-columns:1fr;gap:10px}
.subtema-archivo{display:flex;align-items:center;gap:14px;padding:14px;border:1px solid #e2e8f0;border-radius:12px;background:#f8fafc;transition:transform .12s,box-shadow .12s}
.subtema-archivo.disponible{cursor:pointer}
.subtema-archivo.disponible:hover{transform:translateY(-1px);box-shadow:0 6px 16px rgba(37,99,235,.12);border-color:#bfdbfe}
.subtema-archivo-icon{font-size:30px;line-height:1;width:46px;text-align:center;flex-shrink:0}
.subtema-archivo-body{flex:1;min-width:0}
.subtema-archivo-titulo{font-size:14px;font-weight:700;color:#0f172a;margin:0 0 2px}
.subtema-archivo-sub{font-size:12px;color:#64748b;margin:0}
.subtema-archivo-cta{flex-shrink:0;font-size:13px;font-weight:700;padding:8px 14px;border-radius:8px;text-decoration:none;border:none;cursor:pointer;font-family:inherit}
.subtema-archivo-cta.abrir{background:#2563eb;color:white}
.subtema-archivo-cta.abrir:hover{background:#1d4ed8}
.subtema-archivo.bloqueado{opacity:.78;background:#fff7ed;border-color:#fed7aa}
.subtema-archivo-cta.bloqueado{background:#ea580c;color:white}
.subtema-archivo-cta.bloqueado:hover{background:#c2410c}
.subtema-archivo.pendiente{opacity:.7;background:#f1f5f9}
.subtema-archivo.pendiente .subtema-archivo-cta{background:#cbd5e1;color:#64748b;cursor:not-allowed}
.subtema-plan-badge{display:inline-block;font-size:11px;font-weight:700;padding:3px 8px;border-radius:99px;background:#eff6ff;color:#2563eb;margin-left:6px;vertical-align:middle}
.subtema-plan-badge.basico{background:#f0fdf4;color:#16a34a}
.subtema-plan-badge.premium{background:#f5f3ff;color:#7c3aed}

/* Sección explicativa dentro del subtema */
.subtema-explicacion{background:#f0f9ff;border:1px solid #bae6fd;border-radius:14px;padding:20px 22px;margin:0 0 18px}
.subtema-intro{font-size:15px;color:#0c4a6e;line-height:1.65;margin:0 0 14px}
.subtema-puntos-clave{margin:0 0 12px}
.subtema-puntos-clave h4{font-size:14px;font-weight:700;color:#0369a1;margin:0 0 8px}
.subtema-puntos-clave ul{list-style:none;padding:0;margin:0;display:grid;gap:6px}
.subtema-puntos-clave li{font-size:13px;color:#1e3a5f;padding:6px 10px 6px 28px;background:white;border-radius:8px;position:relative;line-height:1.5;border:1px solid #e0f2fe}
.subtema-puntos-clave li::before{content:'•';position:absolute;left:12px;color:#0284c7;font-weight:900}
.subtema-tip{display:flex;align-items:flex-start;gap:8px;background:linear-gradient(135deg,#fefce8,#fef9c3);border:1px solid #fde68a;border-radius:10px;padding:12px 14px;font-size:13px;color:#854d0e;line-height:1.5}
.subtema-tip-icon{font-size:18px;flex-shrink:0;line-height:1}

/* Hacer los temas clickables */
.mat-categoria-temas li.tema-clickable{cursor:pointer;padding:8px 12px;border-radius:8px;transition:background .15s}
.mat-categoria-temas li.tema-clickable:hover{background:#eff6ff;color:#2563eb}
.tema-flecha{float:right;color:#94a3b8;font-weight:700;transition:transform .15s,color .15s}
.mat-categoria-temas li.tema-clickable:hover .tema-flecha{color:#2563eb;transform:translateX(3px)}

/* ── EXAMEN DE DIAGNÓSTICO ── */
.diag-progress-wrap{width:100%;height:8px;background:#e2e8f0;border-radius:99px;overflow:hidden;margin-bottom:12px}
.diag-progress-bar{height:100%;background:linear-gradient(90deg,#8b5cf6,#6d28d9);border-radius:99px;transition:width .3s}
.diag-counter{font-size:13px;color:#64748b;margin-bottom:16px;text-align:center}
.diag-materia-tag{background:#f3e8ff;color:#7c3aed;padding:2px 10px;border-radius:99px;font-weight:700;font-size:12px}
.diag-card{background:white;border:1px solid #e2e8f0;border-radius:16px;padding:28px;box-shadow:0 4px 24px rgba(0,0,0,.08)}
.diag-dificultad{font-size:11px;font-weight:700;padding:3px 10px;border-radius:99px;text-transform:capitalize;display:inline-block;margin-bottom:8px}
.diag-dificultad.facil{background:#dcfce7;color:#166534}
.diag-dificultad.medio{background:#fef9c3;color:#854d0e}
.diag-dificultad.dificil{background:#fee2e2;color:#991b1b}
.diag-titulo{font-size:17px;font-weight:700;color:#0f172a;margin:0 0 8px}
.diag-enunciado{font-size:14px;color:#475569;line-height:1.7;margin-bottom:16px}
.diag-opciones{display:flex;flex-direction:column;gap:8px;margin-bottom:16px}
.diag-opcion{display:flex;align-items:center;gap:10px;padding:12px 16px;border:1px solid #e2e8f0;border-radius:10px;cursor:pointer;font-size:14px;transition:all .15s;background:white}
.diag-opcion:hover{background:#f8fafc;border-color:#8b5cf6}
.diag-opcion input[type="radio"]{accent-color:#7c3aed;width:16px;height:16px;flex-shrink:0}
.diag-input{width:100%;padding:12px 16px;border:1px solid #e2e8f0;border-radius:10px;font-size:14px;font-family:inherit}
.diag-input:focus{outline:none;border-color:#8b5cf6;box-shadow:0 0 0 3px rgba(139,92,246,.15)}
.diag-btn-siguiente{width:100%;padding:14px;background:linear-gradient(135deg,#8b5cf6,#6d28d9);color:white;border:none;border-radius:12px;font-size:15px;font-weight:700;cursor:pointer;font-family:inherit;transition:opacity .2s}
.diag-btn-siguiente:hover{opacity:.9}
.diag-resultado{background:white;border:1px solid #e2e8f0;border-radius:16px;padding:28px;box-shadow:0 4px 24px rgba(0,0,0,.08)}
.diag-resultado-header{display:flex;align-items:center;gap:20px;margin-bottom:16px;padding-bottom:16px;border-bottom:1px solid #e2e8f0}
.diag-resultado-score{font-size:48px;font-weight:900;color:#7c3aed;line-height:1}
.diag-resultado-header h3{margin:0;font-size:16px;font-weight:700}
.diag-resultado-header p{margin:4px 0 0;font-size:14px;color:#64748b}
.diag-nivel-tag{padding:4px 12px;border-radius:99px;font-size:13px;font-weight:700}
.diag-nivel-tag.avanzado{background:#dcfce7;color:#166534}
.diag-nivel-tag.intermedio{background:#fef9c3;color:#854d0e}
.diag-nivel-tag.básico,.diag-nivel-tag.basico{background:#fee2e2;color:#991b1b}
.diag-materias-grid{display:flex;flex-direction:column;gap:10px;margin-bottom:16px}
.diag-materia-row{display:flex;align-items:center;gap:10px;font-size:13px}
.diag-materia-nombre{min-width:120px;font-weight:600;color:#334155}
.diag-materia-bar-wrap{flex:1;height:10px;background:#e2e8f0;border-radius:99px;overflow:hidden}
.diag-materia-bar{height:100%;border-radius:99px;transition:width .5s}
.diag-materia-pct{min-width:40px;text-align:right;font-weight:700;color:#334155}
.diag-materia-nivel{font-size:12px;min-width:90px}
.diag-resumen{padding:12px 16px;border-radius:10px;font-size:14px;margin-bottom:8px}
.diag-resumen.fuertes{background:#f0fdf4;border:1px solid #bbf7d0;color:#166534}
.diag-resumen.reforzar{background:#fef2f2;border:1px solid #fecaca;color:#991b1b}
.diag-btn-repetir{width:100%;padding:14px;background:#f1f5f9;color:#475569;border:none;border-radius:12px;font-size:15px;font-weight:700;cursor:pointer;font-family:inherit;margin-top:16px;transition:all .2s}
.diag-btn-repetir:hover{background:#e2e8f0}
@media(max-width:600px){.diag-materia-row{flex-wrap:wrap}.diag-materia-nombre{min-width:100%;font-size:14px}}

/* ── Plan contexto de precio ── */
.plan-contexto{font-size:12px;color:#94a3b8;margin:2px 0 8px;font-weight:500;letter-spacing:.02em}

/* ── Timeline de pago ── */
.pago-timeline{display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap;margin-top:20px;padding:18px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);border-radius:14px}
.pago-step{display:flex;flex-direction:column;align-items:center;gap:4px;min-width:80px}
.pago-step-icon{font-size:24px}
.pago-step-text{font-size:12px;font-weight:600;color:#e2e8f0;text-align:center;line-height:1.3}
.pago-step-arrow{font-size:18px;color:#94a3b8;font-weight:700}
.pago-horario{text-align:center;font-size:12px;color:#94a3b8;margin-top:10px}
@media(max-width:600px){.pago-timeline{gap:6px}.pago-step{min-width:60px}.pago-step-text{font-size:10px}.pago-step-arrow{font-size:14px}}

/* ── Testimonios ── */
.testimonios-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px;margin-top:16px}
.testimonio-card{background:var(--white,#fff);border:1px solid var(--gray200,#e2e8f0);border-radius:16px;padding:24px;display:flex;flex-direction:column;gap:12px;transition:all .2s}
.testimonio-card:hover{box-shadow:0 8px 32px rgba(0,0,0,.1);transform:translateY(-2px)}
.testimonio-header{display:flex;align-items:center;gap:12px}
.testimonio-avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,#2563eb,#7c3aed);display:flex;align-items:center;justify-content:center;color:white;font-weight:800;font-size:16px;flex-shrink:0}
.testimonio-info h4{font-size:14px;font-weight:700;color:var(--navy,#0f172a);margin:0}
.testimonio-info p{font-size:12px;color:var(--gray400,#94a3b8);margin:0;font-weight:500}
.testimonio-texto{font-size:14px;line-height:1.7;color:var(--gray600,#475569);font-style:italic}
.testimonio-texto::before{content:'"';font-size:24px;font-weight:900;color:#2563eb;line-height:1;margin-right:2px}
body.dark .testimonio-card{background:var(--gray100);border-color:var(--gray200)}

/* ── LOGROS / INSIGNIAS ── */
.logros-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:10px;margin-top:10px}
.logro-card{position:relative;display:flex;flex-direction:column;align-items:center;text-align:center;gap:4px;padding:16px 10px;border-radius:14px;border:1px solid var(--gray200,#e2e8f0);background:var(--white,#fff);transition:all .2s}
.logro-card.desbloqueado{border-color:#7c3aed;background:linear-gradient(135deg,#faf5ff,#f3e8ff)}
.logro-card.bloqueado{opacity:.5;filter:grayscale(.8)}
.logro-card.desbloqueado:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(124,58,237,.15)}
.logro-icono{font-size:32px;line-height:1}
.logro-nombre{font-size:12px;font-weight:700;color:var(--navy,#0f172a);line-height:1.3}
.logro-desc{font-size:10px;color:var(--gray400,#94a3b8);line-height:1.3}
.logro-fecha{font-size:9px;color:#7c3aed;font-weight:600;margin-top:2px}
.logro-lock{font-size:16px;margin-top:2px}
.logro-bonus{font-size:9px;font-weight:700;color:#f59e0b;background:#fffbeb;padding:1px 6px;border-radius:99px;margin-top:2px}
body.dark .logro-card{background:var(--gray100);border-color:var(--gray200)}
body.dark .logro-card.desbloqueado{border-color:#7c3aed;background:linear-gradient(135deg,#1e1b3a,#2d1f5e)}

/* Logro popup (notificación flotante) */
.logro-popup{position:fixed;top:20px;left:50%;transform:translateX(-50%);z-index:10000;display:none;animation:logroSlideIn .5s ease-out}
.logro-popup.logro-animando{display:flex}
.logro-popup-inner{display:flex;align-items:center;gap:14px;background:linear-gradient(135deg,#7c3aed,#6d28d9);color:white;padding:16px 24px;border-radius:16px;box-shadow:0 12px 40px rgba(124,58,237,.4);min-width:300px;max-width:420px}
.logro-popup-icon{font-size:40px;line-height:1;animation:logroBounce .6s ease-out .3s both}
.logro-popup-text{display:flex;flex-direction:column;gap:2px}
.logro-popup-label{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:1px;opacity:.8}
.logro-popup-text strong{font-size:16px;font-weight:800}
.logro-popup-text small{font-size:12px;opacity:.85}
@keyframes logroSlideIn{from{opacity:0;transform:translateX(-50%) translateY(-30px)}to{opacity:1;transform:translateX(-50%) translateY(0)}}
@keyframes logroBounce{0%{transform:scale(0)}50%{transform:scale(1.3)}100%{transform:scale(1)}}

/* Notificaciones config toggles */
.notif-config{display:flex;flex-direction:column;gap:8px}
.notif-toggle{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--gray600,#475569);cursor:pointer;padding:6px 0}
.notif-toggle input[type="checkbox"]{accent-color:#7c3aed;width:16px;height:16px;flex-shrink:0}

@media(max-width:600px){.logros-grid{grid-template-columns:repeat(auto-fill,minmax(110px,1fr))}.logro-popup-inner{min-width:280px;max-width:calc(100vw - 32px)}}

/* ── Navbar mobile: agrupar items de usuario ── */
@media (max-width: 767px) {
  .nav-user-item a {
    padding-left: 1.5rem;
    font-size: 13px;
    color: var(--color-muted, #64748b) !important;
  }
  .nav-user-item + .nav-user-item a::before {
    content: "";
    display: block;
    border-top: 1px solid rgba(255,255,255,.08);
    margin-bottom: 4px;
  }
}
/* ── Skeleton loaders ya están en index.html inline, complemento aquí ── */
@keyframes skeleton-shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}