:root{
  --navy:#1c2747; --navy-2:#253259; --ink:#1f2433; --paper:#fbf6ec; --card:#ffffff;
  --yellow:#f7b733; --orange:#f0882a; --teal:#3cb6a6; --muted:#5b6275; --line:#e8e1d2;
  --radius:18px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Nunito",system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:var(--paper);line-height:1.6;font-size:17px}
h1,h2,h3{font-family:"Fredoka","Nunito",system-ui,sans-serif;line-height:1.15;margin:0 0 .4em}
a{color:inherit}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:1100px;margin:0 auto;padding:0 20px}

/* header */
header.top{background:var(--navy);color:#fff;position:sticky;top:0;z-index:20}
header.top .wrap{display:flex;align-items:center;gap:16px;min-height:64px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-family:"Fredoka",sans-serif;font-weight:600;font-size:1.4rem;letter-spacing:.06em}
.brand img{width:40px;height:40px;border-radius:10px}
nav.menu{margin-left:auto;display:flex;gap:4px;flex-wrap:wrap;align-items:center}
nav.menu a{text-decoration:none;padding:6px 10px;border-radius:999px;font-weight:700;font-size:.95rem;opacity:.9}
nav.menu a:hover{background:rgba(255,255,255,.1);opacity:1}
nav.menu a.lang{border:2px solid var(--yellow);color:var(--yellow)}
@media (max-width:720px){nav.menu a:not(.lang){display:none}}

/* hero */
.hero{background:var(--navy);color:#fff;padding:56px 0 72px;overflow:hidden;position:relative}
.hero .wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.hero h1{font-size:clamp(2.1rem,5vw,3.4rem);font-weight:600}
.hero h1 span{color:var(--yellow)}
.hero p.lead{font-size:1.15rem;opacity:.92;max-width:34em}
.hero .tags{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0 26px}
.hero .tags span{background:rgba(255,255,255,.1);border-radius:999px;padding:4px 12px;font-weight:700;font-size:.9rem}
.stack{position:relative;height:380px}
.stack img{position:absolute;width:56%;border-radius:8px;box-shadow:0 18px 40px rgba(0,0,0,.45);border:3px solid rgba(255,255,255,.08)}
.stack img:nth-child(1){left:0;top:30px;transform:rotate(-7deg)}
.stack img:nth-child(2){right:0;top:0;transform:rotate(6deg)}
.stack img:nth-child(3){left:22%;top:60px;z-index:2}
@media (max-width:820px){.hero .wrap{grid-template-columns:1fr}.stack{height:300px;max-width:420px;margin:0 auto;width:100%}}

.btn{display:inline-flex;align-items:center;gap:8px;text-decoration:none;font-weight:800;border-radius:999px;padding:12px 20px;border:0;cursor:pointer;font-size:1rem;font-family:inherit;transition:transform .1s}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--yellow);color:var(--navy)}
.btn-ghost{background:transparent;color:inherit;border:2px solid currentColor}
.btn-teal{background:var(--teal);color:#fff}
.btns{display:flex;gap:10px;flex-wrap:wrap}

/* sections */
section.block{padding:64px 0}
.kicker{display:inline-block;background:var(--teal);color:#fff;border-radius:999px;padding:4px 14px;font-weight:800;font-size:.85rem;margin-bottom:12px}
.block h2{font-size:clamp(1.7rem,3.5vw,2.4rem);color:var(--navy)}
.block .intro{color:var(--muted);max-width:42em;margin-bottom:32px}

/* book cards */
.books{display:grid;gap:28px}
.book{background:var(--card);border-radius:var(--radius);box-shadow:0 2px 0 var(--line),0 10px 30px rgba(28,39,71,.07);display:grid;grid-template-columns:230px 1fr;gap:28px;padding:26px;align-items:start}
.book .cover{border-radius:8px;box-shadow:0 10px 24px rgba(0,0,0,.18)}
.book h3{font-size:1.55rem;color:var(--navy);margin-bottom:2px}
.book .sub{font-weight:800;color:var(--orange);margin:0 0 10px}
.book p{margin:0 0 12px}
.chips{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 16px;padding:0;list-style:none}
.chips li{background:#f2ede1;border-radius:999px;padding:3px 11px;font-size:.88rem;font-weight:700;color:var(--navy-2)}
.chips li.age{background:var(--orange);color:#fff}
.peek{display:flex;align-items:center;gap:12px;margin:4px 0 18px;background:none;border:0;padding:0;cursor:zoom-in;font:inherit;color:var(--muted);text-align:left}
.peek img{width:74px;border:1px solid var(--line);border-radius:6px}
.peek span{font-weight:700;text-decoration:underline;text-underline-offset:3px}
.other{font-size:.9rem;color:var(--muted);margin-top:12px}
@media (max-width:700px){.book{grid-template-columns:1fr;padding:20px}.book .cover{max-width:240px;margin:0 auto}}

/* free samples */
.samples{background:var(--navy);color:#fff}
.samples h2{color:#fff}
.samples .intro{color:rgba(255,255,255,.8)}
.sample-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}
.sample{background:var(--navy-2);border-radius:14px;padding:14px;display:flex;gap:12px;align-items:center;text-decoration:none;color:#fff;border:2px solid transparent}
.sample:hover{border-color:var(--yellow)}
.sample img{width:56px;border-radius:4px}
.sample b{display:block;line-height:1.2}
.sample small{color:var(--yellow);font-weight:800}

/* about */
.about .wrap{display:grid;grid-template-columns:160px 1fr;gap:32px;align-items:center}
.about img{width:160px;border-radius:24px}
@media (max-width:640px){.about .wrap{grid-template-columns:1fr}.about img{width:110px}}
.values{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.values span{border:2px solid var(--teal);color:var(--navy);border-radius:999px;padding:3px 12px;font-weight:800;font-size:.9rem}

/* contact & footer */
.contact{background:#fff;border-top:1px solid var(--line)}
.mail{font-size:1.2rem;font-weight:800;color:var(--navy);word-break:break-all}
footer{background:var(--navy);color:rgba(255,255,255,.7);padding:26px 0;font-size:.9rem}
footer .wrap{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}

/* lightbox */
dialog.lb{border:0;padding:0;background:transparent;max-width:min(92vw,620px)}
dialog.lb::backdrop{background:rgba(10,14,28,.8)}
dialog.lb img{max-height:86vh;width:auto;margin:0 auto;border-radius:6px}
dialog.lb button{position:absolute;top:8px;right:8px;background:var(--yellow);color:var(--navy);border:0;border-radius:999px;width:38px;height:38px;font-size:1.3rem;font-weight:900;cursor:pointer}