:root{
  --navy:#16357E;--royal:#2E7CC4;--teal:#20B8CE;--light:#36C5D8;
  --ink:#0E1B3D;--muted:#5b6680;--bg:#f6f9fc;--white:#fff;--wa:#25D366;
  --line:#e7eef6;--radius:16px;--shadow:0 14px 40px rgba(22,53,126,.10);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Segoe UI',system-ui,-apple-system,Roboto,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.55}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}
a{color:inherit}

/* logo */
.logo{font-weight:800;letter-spacing:.04em;display:inline-flex;line-height:1}
.logo .a{color:var(--navy)}.logo .k{color:var(--royal)}.logo .i{color:var(--teal)}

/* header */
header{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.95);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:16px;height:68px}
.nav .logo{font-size:30px}
.nav .slogan{color:var(--muted);font-size:13px;font-weight:600;display:none}
@media(min-width:900px){.nav .slogan{display:block}}
.nav .spacer{flex:1}
.cart-btn{position:relative;background:var(--navy);color:#fff;border:none;cursor:pointer;border-radius:999px;padding:11px 20px;font-weight:700;font-size:15px;display:inline-flex;align-items:center;gap:8px}
.cart-btn .count{position:absolute;top:-7px;right:-7px;background:var(--teal);color:#04263b;font-size:12px;font-weight:800;min-width:22px;height:22px;border-radius:11px;display:grid;place-items:center;padding:0 5px}

/* hero */
.hero{background:radial-gradient(1100px 520px at 85% -10%,rgba(54,197,216,.18),transparent 60%),linear-gradient(135deg,#fff,#eef5fb);padding:60px 0 56px;text-align:center}
.hero .logo-big{font-size:clamp(56px,14vw,120px);font-weight:800;margin-bottom:4px}
.hero .logo-big .a{color:var(--navy)}.hero .logo-big .k{color:var(--royal)}.hero .logo-big .i{color:var(--teal)}
.slogan-main{font-size:clamp(18px,3.4vw,26px);font-weight:700;background:linear-gradient(90deg,var(--navy),var(--teal));-webkit-background-clip:text;background-clip:text;color:transparent;margin-bottom:22px}
.hero h1{font-size:clamp(26px,4.6vw,42px);font-weight:800;line-height:1.15;max-width:760px;margin:0 auto 14px}
.hero p.sub{font-size:clamp(16px,2.3vw,20px);color:var(--muted);max-width:600px;margin:0 auto 20px}
.pills{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:26px}
.pill{background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 16px;font-weight:700;font-size:14px;color:var(--navy);box-shadow:var(--shadow)}
.pill b{color:var(--teal)}
.btn{display:inline-flex;align-items:center;gap:9px;border:none;cursor:pointer;font-weight:700;font-size:16px;text-decoration:none;border-radius:999px;padding:15px 30px;transition:transform .15s}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:linear-gradient(135deg,var(--navy),var(--teal));color:#fff;box-shadow:0 12px 28px rgba(22,53,126,.28)}

/* mode toggle */
.mode-bar{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:68px;z-index:30}
.mode-inner{display:flex;align-items:center;gap:14px;justify-content:center;padding:14px 0;flex-wrap:wrap}
.mode-label{font-weight:700;color:var(--muted);font-size:14px}
.toggle{display:inline-flex;background:#eef3f9;border-radius:999px;padding:4px}
.toggle button{border:none;background:transparent;cursor:pointer;padding:9px 22px;border-radius:999px;font-weight:700;font-size:15px;color:var(--muted)}
.toggle button.active{background:var(--navy);color:#fff}
.mode-note{font-size:13px;color:var(--muted)}

/* categories filter */
.cats{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;padding:26px 0 6px}
.cat{border:1px solid var(--line);background:#fff;border-radius:999px;padding:9px 18px;font-weight:700;font-size:14px;cursor:pointer;color:var(--navy)}
.cat.active{background:var(--teal);border-color:var(--teal);color:#04263b}

/* products */
.section-title{text-align:center;padding:34px 0 10px}
.section-title h2{font-size:clamp(24px,4vw,34px);font-weight:800}
.section-title p{color:var(--muted);margin-top:6px}
.grid{display:grid;gap:22px;grid-template-columns:repeat(2,1fr);padding:24px 0 60px}
@media(min-width:680px){.grid{grid-template-columns:repeat(3,1fr)}}
@media(min-width:980px){.grid{grid-template-columns:repeat(4,1fr)}}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column}
.thumb{aspect-ratio:1/1;display:grid;place-items:center;font-size:54px;background:linear-gradient(135deg,#eaf3fb,#dcecf7)}
.card-body{padding:16px;display:flex;flex-direction:column;gap:6px;flex:1}
.card .cat-tag{font-size:11px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:var(--teal)}
.card h3{font-size:16px;line-height:1.3}
.card .price{font-size:20px;font-weight:800;color:var(--navy);margin-top:auto}
.card .price small{font-size:12px;color:var(--muted);font-weight:600}
.add{margin-top:10px;border:none;cursor:pointer;background:var(--navy);color:#fff;font-weight:700;border-radius:10px;padding:11px;font-size:14px;transition:background .15s}
.add:hover{background:var(--royal)}

/* trust strip */
.trust{background:linear-gradient(135deg,var(--navy),#0f2a63);color:#fff;padding:50px 0}
.trust-grid{display:grid;gap:24px;grid-template-columns:1fr;text-align:center;max-width:900px;margin:0 auto}
@media(min-width:760px){.trust-grid{grid-template-columns:repeat(3,1fr)}}
.trust h3{font-size:18px;margin-bottom:6px}
.trust p{color:#c4d3ec;font-size:15px}
.trust .ic{font-size:34px;margin-bottom:10px}

/* nav links */
.nav-links{display:none;gap:20px;font-weight:700;font-size:15px;margin-right:6px}
.nav-links a{color:var(--navy);text-decoration:none}
.nav-links a:hover{color:var(--teal)}
@media(min-width:760px){.nav-links{display:flex}}

/* librería */
.libreria-hero{background:radial-gradient(900px 420px at 80% -20%,rgba(54,197,216,.20),transparent 60%),linear-gradient(135deg,#fff,#eef5fb);padding:46px 0 30px;text-align:center}
.libreria-hero h1{font-size:clamp(28px,5vw,42px);font-weight:800;margin-bottom:10px}
.libreria-hero h1 .em{font-size:1.1em}
.libreria-hero p{color:var(--muted);font-size:clamp(15px,2.3vw,19px);max-width:640px;margin:0 auto}
.libreria{background:linear-gradient(180deg,#eef5fb,#f6f9fc);border-top:1px solid var(--line)}
.school-tabs{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;padding:6px 0 4px}
.school-tab{border:1px solid var(--line);background:#fff;border-radius:14px;padding:14px 22px;font-weight:800;font-size:16px;cursor:pointer;color:var(--navy);display:flex;flex-direction:column;align-items:center;gap:2px;min-width:120px;transition:.15s}
.school-tab small{font-size:11px;font-weight:600;color:var(--muted)}
.school-tab.active{background:linear-gradient(135deg,var(--navy),var(--royal));color:#fff;border-color:transparent;box-shadow:var(--shadow)}
.school-tab.active small{color:#cfe2f4}
.grade-tabs{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;padding:18px 0 6px}
.grade-tab{border:1px solid var(--line);background:#fff;border-radius:999px;padding:8px 16px;font-weight:700;font-size:14px;cursor:pointer;color:var(--navy)}
.grade-tab.active{background:var(--teal);border-color:var(--teal);color:#04263b}
.lista-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);max-width:760px;margin:18px auto 0;overflow:hidden}
.lista-head{padding:18px 20px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap}
.lista-head h3{font-size:18px}
.lista-head .lh-note{font-size:13px;color:var(--muted)}
.lista-row{display:flex;align-items:center;gap:12px;padding:12px 20px;border-bottom:1px solid var(--line)}
.lista-row:last-child{border-bottom:none}
.lista-row .lr-ico{width:40px;height:40px;border-radius:10px;background:linear-gradient(135deg,#eaf3fb,#dcecf7);display:grid;place-items:center;font-size:20px;flex-shrink:0}
.lista-row .lr-info{flex:1;min-width:0}
.lista-row .lr-info h4{font-size:14px;line-height:1.3}
.lista-row .lr-info small{color:var(--muted);font-size:12px}
.lista-row .qty{display:inline-flex;align-items:center;border:1px solid var(--line);border-radius:8px}
.lista-row .qty button{width:28px;height:28px;border:none;background:#f2f6fb;cursor:pointer;font-size:16px;font-weight:700;color:var(--navy)}
.lista-row .qty span{width:30px;text-align:center;font-weight:700;font-size:14px}
.lista-row .lr-sub{width:64px;text-align:right;font-weight:800;color:var(--navy);font-size:14px}
.lista-foot{padding:18px 20px;background:#f8fbfe;display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap}
.lista-foot .lf-tot{font-size:15px;font-weight:700;color:var(--muted)}
.lista-foot .lf-tot b{font-size:24px;color:var(--navy);display:block}
.lista-foot .add-lista{background:var(--navy);color:#fff;border:none;cursor:pointer;border-radius:12px;padding:14px 22px;font-weight:800;font-size:15px;flex:1;min-width:220px}
.lista-foot .add-lista:hover{background:var(--royal)}
.lista-empty{text-align:center;color:var(--muted);padding:30px}

/* cart drawer */
.overlay{position:fixed;inset:0;background:rgba(8,18,45,.45);opacity:0;visibility:hidden;transition:.2s;z-index:60}
.overlay.open{opacity:1;visibility:visible}
.drawer{position:fixed;top:0;right:0;height:100%;width:min(420px,100%);background:#fff;z-index:70;transform:translateX(100%);transition:transform .25s;display:flex;flex-direction:column}
.drawer.open{transform:translateX(0)}
.drawer-head{padding:20px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}
.drawer-head h3{font-size:20px}
.close{background:none;border:none;font-size:26px;cursor:pointer;color:var(--muted);line-height:1}
.drawer-items{flex:1;overflow-y:auto;padding:10px 20px}
.empty{text-align:center;color:var(--muted);padding:50px 10px}
.ci{display:flex;gap:12px;padding:14px 0;border-bottom:1px solid var(--line)}
.ci .ci-thumb{width:54px;height:54px;border-radius:10px;background:linear-gradient(135deg,#eaf3fb,#dcecf7);display:grid;place-items:center;font-size:26px;flex-shrink:0}
.ci .ci-info{flex:1}
.ci .ci-info h4{font-size:14px;margin-bottom:2px}
.ci .ci-info .ci-price{color:var(--navy);font-weight:700;font-size:14px}
.qty{display:inline-flex;align-items:center;gap:0;border:1px solid var(--line);border-radius:8px;margin-top:6px}
.qty button{width:28px;height:28px;border:none;background:#f2f6fb;cursor:pointer;font-size:16px;font-weight:700;color:var(--navy)}
.qty span{width:34px;text-align:center;font-weight:700;font-size:14px}
.ci .rm{background:none;border:none;color:#c0392b;cursor:pointer;font-size:12px;margin-top:6px;display:block}
.drawer-foot{padding:20px;border-top:1px solid var(--line)}
.totrow{display:flex;justify-content:space-between;font-size:18px;font-weight:800;margin-bottom:6px}
.foot-note{font-size:12px;color:var(--muted);margin-bottom:14px}
.checkout{width:100%;background:var(--wa);color:#fff;border:none;cursor:pointer;border-radius:12px;padding:16px;font-weight:800;font-size:16px;display:flex;align-items:center;justify-content:center;gap:9px}
.checkout:disabled{opacity:.5;cursor:not-allowed}
.wa-ico{width:20px;height:20px;fill:currentColor}

/* footer */
footer{background:#0c1838;color:#9fb0d0;text-align:center;padding:36px 0;font-size:14px}
footer .logo{font-size:24px;margin-bottom:8px}
footer .logo .a{color:#fff}footer .logo .k{color:var(--royal)}footer .logo .i{color:var(--light)}
footer a{color:var(--light);text-decoration:none}

/* toast */
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(120px);background:var(--ink);color:#fff;padding:14px 22px;border-radius:999px;font-weight:700;z-index:90;transition:transform .25s;box-shadow:0 12px 30px rgba(0,0,0,.25)}
.toast.show{transform:translateX(-50%) translateY(0)}