/* ============================================================
   Лендинг: обучающие тетради для дошкольников
   Елена Изотова · Академия занимательных наук
   ============================================================ */

:root{
  --ink:#2A1E3F;
  --ink-soft:#6A5B85;
  --cream:#FFF9F4;
  --white:#fff;

  --pink:#FF5C8A;
  --purple:#7C5CFC;
  --sky:#38B6FF;
  --mint:#22C9A0;
  --amber:#FFB020;
  --coral:#FF7A59;

  --radius-s:14px;
  --radius-m:22px;
  --radius-l:32px;

  --shadow-s:0 4px 14px rgba(42,30,63,.07);
  --shadow-m:0 10px 30px rgba(42,30,63,.10);
  --shadow-l:0 24px 60px rgba(42,30,63,.16);

  --wrap:1180px;
}

*,*::before,*::after{box-sizing:border-box}

html{scroll-behavior:smooth; scroll-padding-top:92px}

body{
  margin:0;
  background:var(--cream);
  color:var(--ink);
  font-family:'Nunito',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  font-size:17px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

img{max-width:100%; display:block}
a{color:inherit; text-decoration:none}
button{font:inherit; color:inherit}

.wrap{width:100%; max-width:var(--wrap); margin:0 auto; padding:0 24px}

.skip-link{
  position:absolute; left:-9999px; top:0; z-index:200;
  background:var(--ink); color:#fff; padding:12px 20px; border-radius:0 0 12px 0;
}
.skip-link:focus{left:0}

/* ─────────────── кнопки ─────────────── */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:9px;
  border:0; border-radius:999px; cursor:pointer;
  font-weight:800; letter-spacing:.01em;
  transition:transform .18s ease, box-shadow .18s ease, background .18s ease, color .18s ease;
  white-space:nowrap;
}
.btn svg{width:19px; height:19px; fill:none; stroke:currentColor; stroke-width:2.4; stroke-linecap:round; stroke-linejoin:round; transition:transform .2s ease}
.btn:hover svg{transform:translateX(3px)}
.btn:focus-visible{outline:3px solid var(--purple); outline-offset:3px}

.btn-sm{padding:11px 20px; font-size:15px}
.btn-lg{padding:16px 30px; font-size:17px}

.btn-primary{
  background:linear-gradient(135deg,var(--pink),var(--purple));
  color:#fff; box-shadow:0 10px 24px rgba(255,92,138,.32);
}
.btn-primary:hover{transform:translateY(-2px); box-shadow:0 16px 32px rgba(255,92,138,.40)}

.btn-ghost{
  background:var(--white); color:var(--ink);
  box-shadow:inset 0 0 0 2px rgba(42,30,63,.12);
}
.btn-ghost:hover{transform:translateY(-2px); box-shadow:inset 0 0 0 2px rgba(42,30,63,.22), var(--shadow-m)}

/* ─────────────── шапка ─────────────── */
.topbar{
  position:sticky; top:0; z-index:100;
  background:rgba(255,249,244,.82);
  backdrop-filter:blur(14px); -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;
  transition:border-color .25s ease, box-shadow .25s ease;
}
.topbar.is-stuck{border-bottom-color:rgba(42,30,63,.09); box-shadow:0 4px 20px rgba(42,30,63,.06)}

.topbar-inner{display:flex; align-items:center; gap:24px; height:74px}

.logo{display:flex; align-items:center; gap:12px; margin-right:auto}
.logo-mark{
  display:grid; place-items:center;
  width:42px; height:42px; flex:none;
  border-radius:13px;
  background:linear-gradient(135deg,var(--pink),var(--purple));
  color:#fff; font-weight:900; font-size:22px;
  box-shadow:0 6px 16px rgba(124,92,252,.32);
}
.logo-text{font-weight:800; font-size:14px; line-height:1.18; letter-spacing:.01em; color:var(--ink)}

.nav{display:flex; gap:28px; font-weight:700; font-size:16px}
.nav a{color:var(--ink-soft); position:relative; padding:4px 0; transition:color .18s ease}
.nav a::after{
  content:''; position:absolute; left:0; right:100%; bottom:0; height:2.5px;
  border-radius:2px; background:linear-gradient(90deg,var(--pink),var(--purple));
  transition:right .22s ease;
}
.nav a:hover{color:var(--ink)}
.nav a:hover::after{right:0}

/* ─────────────── герой ─────────────── */
.hero{position:relative; padding:78px 0 92px; overflow:hidden}

.hero-blob{position:absolute; border-radius:50%; filter:blur(58px); opacity:.5; pointer-events:none}
.hero-blob-1{width:430px; height:430px; background:#FFD9E6; top:-130px; right:6%}
.hero-blob-2{width:330px; height:330px; background:#DDD3FF; bottom:-110px; left:-70px}
.hero-blob-3{width:260px; height:260px; background:#D3F5EA; top:44%; right:36%}

.hero-inner{position:relative; display:grid; grid-template-columns:1.06fr .94fr; gap:56px; align-items:center}

.pill{
  display:inline-block; padding:8px 17px; border-radius:999px;
  font-weight:800; font-size:14.5px; letter-spacing:.02em;
}
.pill-author{background:var(--white); color:var(--purple); box-shadow:var(--shadow-s)}

.hero-title{
  margin:20px 0 20px;
  font-size:clamp(38px,5.4vw,64px);
  line-height:1.05;
  font-weight:900;
  letter-spacing:-.022em;
}
.hl{position:relative; white-space:nowrap}
.hl::after{
  content:''; position:absolute; left:-2%; right:-2%; bottom:.08em; height:.36em;
  background:linear-gradient(90deg,#FFE27A,#FFB7CE);
  border-radius:.4em; z-index:-1;
}

.hero-lead{margin:0 0 26px; font-size:19.5px; color:var(--ink-soft); max-width:36em}
.hero-lead strong{color:var(--ink); font-weight:800}

.hero-facts{display:flex; flex-wrap:wrap; gap:10px; margin:0 0 32px; padding:0; list-style:none}
.hero-facts li{
  background:var(--white); border-radius:999px; padding:9px 17px;
  font-weight:700; font-size:15px; color:var(--ink-soft);
  box-shadow:var(--shadow-s);
}
.hero-facts strong{color:var(--pink); font-weight:900}

.hero-actions{display:flex; flex-wrap:wrap; gap:14px}

/* коллаж обложек */
.hero-collage{position:relative; height:500px}
.collage-card{
  position:absolute; margin:0; width:236px;
  border-radius:var(--radius-m); overflow:hidden;
  box-shadow:var(--shadow-l);
  border:5px solid var(--white);
  transition:transform .35s cubic-bezier(.2,.8,.3,1);
}
.collage-card img{width:100%; height:auto}
.collage-card:hover{transform:translateY(-8px) scale(1.02)}

.c1{top:14px;  left:8%;  transform:rotate(-8deg); z-index:3; animation:float 7s ease-in-out infinite}
.c2{top:132px; left:40%; transform:rotate(5deg);  z-index:2; animation:float 8s ease-in-out infinite .8s}
.c3{top:250px; left:12%; transform:rotate(-3deg); z-index:1; animation:float 9s ease-in-out infinite 1.6s}

@keyframes float{0%,100%{translate:0 0}50%{translate:0 -14px}}

.collage-sticker{
  position:absolute; z-index:4;
  display:grid; place-items:center;
  border-radius:18px; font-weight:900;
  box-shadow:var(--shadow-m);
}
.sticker-1{
  top:64px; right:2%;
  background:var(--amber); color:var(--ink);
  padding:14px 16px; font-size:19px; letter-spacing:.12em;
  transform:rotate(11deg);
}
.sticker-2{
  bottom:44px; right:16%;
  width:62px; height:62px; border-radius:50%;
  background:var(--mint); color:#fff; font-size:28px;
  transform:rotate(-8deg);
}

/* ─────────────── преимущества ─────────────── */
.features{padding:70px 0}
.features-grid{
  display:grid; grid-template-columns:repeat(4,1fr); gap:22px;
  margin:0; padding:0; list-style:none;
}
.feature{
  background:var(--white); border-radius:var(--radius-m);
  padding:28px 24px 30px; box-shadow:var(--shadow-s);
  transition:transform .25s ease, box-shadow .25s ease;
}
.feature:hover{transform:translateY(-6px); box-shadow:var(--shadow-m)}
.feature h3{margin:16px 0 8px; font-size:19px; font-weight:800}
.feature p{margin:0; font-size:15.5px; color:var(--ink-soft); line-height:1.55}

.feature-icon{
  display:grid; place-items:center;
  width:54px; height:54px; border-radius:17px;
  background:color-mix(in srgb, var(--c) 15%, #fff);
  color:var(--c);
}
.feature-icon svg{width:27px; height:27px; fill:none; stroke:currentColor; stroke-width:2; stroke-linecap:round; stroke-linejoin:round}

/* ─────────────── секции ─────────────── */
.section-head{text-align:center; max-width:660px; margin:0 auto 40px}
.section-kicker{
  display:inline-block; margin-bottom:12px;
  font-weight:900; font-size:14px; letter-spacing:.14em; text-transform:uppercase;
  color:var(--purple);
}
.section-title{margin:0 0 12px; font-size:clamp(30px,4vw,44px); font-weight:900; letter-spacing:-.02em; line-height:1.12}
.section-sub{margin:0; font-size:18px; color:var(--ink-soft)}

/* ─────────────── каталог ─────────────── */
.catalog{padding:74px 0 96px; background:var(--white)}
.catalog .section-kicker{color:var(--pink)}

.filters{display:flex; flex-wrap:wrap; justify-content:center; gap:10px; margin-bottom:38px}
.filter{
  display:inline-flex; align-items:center; gap:8px;
  padding:11px 20px; border:0; cursor:pointer;
  border-radius:999px; background:#F4F0FA; color:var(--ink-soft);
  font-weight:800; font-size:15.5px;
  transition:background .2s ease, color .2s ease, transform .2s ease, box-shadow .2s ease;
}
.filter:hover{background:#E9E2F7; transform:translateY(-2px)}
.filter.is-active{
  background:linear-gradient(135deg,var(--pink),var(--purple));
  color:#fff; box-shadow:0 8px 20px rgba(124,92,252,.30);
}
.filter-n{
  display:grid; place-items:center; min-width:22px; height:22px; padding:0 6px;
  border-radius:999px; background:rgba(42,30,63,.08);
  font-size:13px; font-weight:800;
}
.filter.is-active .filter-n{background:rgba(255,255,255,.24)}

.grid{
  display:grid; grid-template-columns:repeat(4,1fr); gap:26px;
}

.card{
  display:flex; flex-direction:column;
  background:var(--cream);
  border-radius:var(--radius-l);
  overflow:hidden;
  box-shadow:var(--shadow-s);
  transition:transform .28s cubic-bezier(.2,.8,.3,1), box-shadow .28s ease;
}
.card:hover{transform:translateY(-8px); box-shadow:var(--shadow-l)}
.card.is-hidden{display:none}

.card-media{position:relative; display:block; padding:16px 16px 0; background:var(--white)}
.card-media img{
  width:100%; height:auto; border-radius:var(--radius-m);
  box-shadow:0 8px 22px rgba(42,30,63,.13);
  transition:transform .35s ease;
}
.card:hover .card-media img{transform:scale(1.035)}

.card-part{
  position:absolute; top:26px; right:26px;
  padding:6px 13px; border-radius:999px;
  background:var(--ink); color:#fff;
  font-size:12.5px; font-weight:900; letter-spacing:.05em; text-transform:uppercase;
  box-shadow:var(--shadow-m);
}

.card-body{display:flex; flex-direction:column; gap:9px; padding:20px 22px 24px; flex:1}

.card-series{
  align-self:flex-start;
  padding:5px 12px; border-radius:999px;
  background:color-mix(in srgb, var(--c) 14%, #fff);
  color:var(--c);
  font-size:13px; font-weight:900; letter-spacing:.01em;
}

.card-title{margin:0; font-size:19.5px; font-weight:800; line-height:1.28; letter-spacing:-.01em}
.card-note{margin:-4px 0 0; font-size:15px; color:var(--ink-soft)}

.chips{display:flex; flex-wrap:wrap; gap:7px; margin:2px 0 14px}
.chip{
  padding:5px 11px; border-radius:9px;
  background:rgba(42,30,63,.06); color:var(--ink-soft);
  font-size:13px; font-weight:700;
}

.btn-buy{
  margin-top:auto;
  padding:13px 20px; font-size:16px;
  background:var(--c); color:#fff;
  box-shadow:0 8px 18px color-mix(in srgb, var(--c) 34%, transparent);
}
.btn-buy:hover{transform:translateY(-2px); box-shadow:0 12px 24px color-mix(in srgb, var(--c) 44%, transparent)}

.empty-note{text-align:center; margin:40px 0 0; font-size:18px; color:var(--ink-soft)}

/* ─────────────── как купить ─────────────── */
.how{padding:96px 0; background:linear-gradient(180deg,var(--cream),#FDF3FA)}
.how .section-kicker{color:var(--mint)}

.steps{display:grid; grid-template-columns:repeat(3,1fr); gap:24px; margin:0; padding:0; list-style:none; counter-reset:step}
.step{
  position:relative;
  background:var(--white); border-radius:var(--radius-l);
  padding:34px 26px 32px; box-shadow:var(--shadow-s);
}
.step-num{
  display:grid; place-items:center;
  width:52px; height:52px; margin-bottom:18px;
  border-radius:17px;
  background:linear-gradient(135deg,var(--mint),var(--sky));
  color:#fff; font-size:24px; font-weight:900;
  box-shadow:0 8px 18px rgba(34,201,160,.34);
}
.step h3{margin:0 0 9px; font-size:20px; font-weight:800}
.step p{margin:0; font-size:16px; color:var(--ink-soft); line-height:1.55}

/* ─────────────── об авторе ─────────────── */
.about{padding:96px 0; background:var(--white)}
.about-inner{
  display:grid; grid-template-columns:auto 1fr; gap:44px; align-items:center;
  background:linear-gradient(135deg,#FFF3F7,#F3EEFF);
  border-radius:var(--radius-l);
  padding:48px 52px;
}
.about-avatar{width:132px; height:132px}
.about-avatar svg{width:100%; height:100%}
.about .section-title{margin-bottom:14px}
.about p{margin:0 0 20px; font-size:18px; color:var(--ink-soft); max-width:60ch}
.about p strong{color:var(--ink); font-weight:800}

.about-list{margin:0; padding:0; list-style:none; display:grid; gap:9px}
.about-list li{position:relative; padding-left:30px; font-weight:700; color:var(--ink-soft)}
.about-list li::before{
  content:''; position:absolute; left:0; top:.52em;
  width:18px; height:18px; border-radius:50%;
  background:linear-gradient(135deg,var(--pink),var(--purple));
}
.about-list li::after{
  content:''; position:absolute; left:5px; top:calc(.52em + 5px);
  width:8px; height:4.5px;
  border-left:2.2px solid #fff; border-bottom:2.2px solid #fff;
  transform:rotate(-45deg);
}

/* ─────────────── CTA ─────────────── */
.cta{padding:0 0 96px; background:var(--white)}
.cta-inner{
  position:relative; overflow:hidden;
  text-align:center;
  background:linear-gradient(135deg,var(--purple),var(--pink));
  border-radius:var(--radius-l);
  padding:64px 40px;
  color:#fff;
  box-shadow:0 24px 50px rgba(124,92,252,.30);
}
.cta-inner::before,
.cta-inner::after{
  content:''; position:absolute; border-radius:50%; background:rgba(255,255,255,.13);
}
.cta-inner::before{width:270px; height:270px; top:-120px; left:-60px}
.cta-inner::after{width:210px; height:210px; bottom:-100px; right:-40px}
.cta h2{margin:0 0 12px; font-size:clamp(28px,4vw,42px); font-weight:900; letter-spacing:-.02em}
.cta p{margin:0 0 30px; font-size:19px; opacity:.94}
.cta .btn-primary{background:#fff; color:var(--purple); box-shadow:0 14px 30px rgba(0,0,0,.18)}
.cta .btn-primary:hover{box-shadow:0 20px 40px rgba(0,0,0,.24)}

/* ─────────────── подвал ─────────────── */
.footer{padding:52px 0; background:var(--ink); color:#fff}
.footer-inner{display:grid; gap:26px; justify-items:center; text-align:center}

.footer-brand{display:flex; align-items:center; gap:13px; text-align:left}
.footer-brand .logo-mark{box-shadow:none}
.footer-brand div{display:grid}
.footer-brand strong{font-size:16px; font-weight:800}
.footer-brand span{font-size:14px; color:rgba(255,255,255,.62)}

.footer-nav{display:flex; gap:26px; font-weight:700; font-size:16px}
.footer-nav a{color:rgba(255,255,255,.78); transition:color .18s ease}
.footer-nav a:hover{color:#fff}

.footer-note{margin:0; max-width:56ch; font-size:14.5px; color:rgba(255,255,255,.52); line-height:1.55}

/* ─────────────── лайтбокс ─────────────── */
.lightbox{
  position:fixed; inset:0; z-index:200;
  display:grid; place-items:center;
  padding:32px;
  background:rgba(24,16,38,.86);
  backdrop-filter:blur(6px); -webkit-backdrop-filter:blur(6px);
  opacity:0; transition:opacity .24s ease;
}
.lightbox.is-open{opacity:1}
.lightbox[hidden]{display:none}
.lightbox-img{
  max-width:min(560px,92vw); max-height:88vh; width:auto; height:auto;
  border-radius:var(--radius-m); background:#fff;
  box-shadow:0 30px 80px rgba(0,0,0,.5);
  transform:scale(.94); transition:transform .28s cubic-bezier(.2,.8,.3,1);
}
.lightbox.is-open .lightbox-img{transform:scale(1)}
.lightbox-close{
  position:absolute; top:22px; right:22px;
  width:46px; height:46px; display:grid; place-items:center;
  border:0; border-radius:50%; cursor:pointer;
  background:rgba(255,255,255,.16); color:#fff;
  transition:background .2s ease, transform .2s ease;
}
.lightbox-close:hover{background:rgba(255,255,255,.30); transform:rotate(90deg)}
.lightbox-close svg{width:22px; height:22px; fill:none; stroke:currentColor; stroke-width:2.4; stroke-linecap:round}

/* ─────────────── анимация появления ─────────────── */
/* Скрытое состояние включается только когда JS точно работает (класс .js-reveal
   ставится инлайн-скриптом в <head>). Без JS контент виден сразу. */
.js-reveal .reveal{opacity:0; translate:0 22px; transition:opacity .6s ease, translate .6s cubic-bezier(.2,.8,.3,1)}
.js-reveal .reveal.is-visible{opacity:1; translate:0 0}

/* ─────────────── адаптив ─────────────── */
@media (max-width:1080px){
  .grid{grid-template-columns:repeat(3,1fr)}
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .hero-collage{height:440px}
  .collage-card{width:205px}
}

@media (max-width:900px){
  html{scroll-padding-top:80px}
  .hero{padding:54px 0 68px}
  .hero-inner{grid-template-columns:1fr; gap:48px}
  .hero-collage{height:auto; max-width:520px; margin:0 auto; padding-bottom:12px}
  .collage-card{width:46%}
  .c1{top:0;   left:4%}
  .c2{top:96px; left:46%}
  .c3{top:190px; left:14%}
  .sticker-1{top:20px; right:0}
  .sticker-2{bottom:6px; right:6%}
  .grid{grid-template-columns:repeat(2,1fr); gap:20px}
  .steps{grid-template-columns:1fr}
  .about-inner{grid-template-columns:1fr; gap:28px; padding:38px 32px; text-align:center}
  .about-avatar{margin:0 auto}
  .about-list{justify-items:start; text-align:left}
  .nav{display:none}
}

@media (max-width:620px){
  body{font-size:16px}
  .topbar-inner{height:66px; gap:12px}
  .logo-text{display:none}
  .btn-sm{padding:10px 16px; font-size:14.5px}
  .hero-title{font-size:clamp(31px,8.4vw,42px)}
  .hero-lead{font-size:17.5px}
  .hero-actions .btn{width:100%}
  .hero-collage{height:340px}
  .collage-card{width:44%; border-width:4px}
  .c2{top:78px; left:44%}
  .c3{top:156px; left:12%}
  .sticker-1{padding:10px 13px; font-size:15px}
  .sticker-2{width:48px; height:48px; font-size:21px}
  .features-grid{grid-template-columns:1fr}
  .grid{grid-template-columns:1fr; max-width:420px; margin:0 auto}
  .filters{gap:8px}
  .filter{padding:10px 15px; font-size:14.5px}
  .about{padding:64px 0}
  .about-inner{padding:30px 24px}
  .cta-inner{padding:46px 24px}
  .cta .btn-lg{width:100%}
  .footer-nav{flex-wrap:wrap; justify-content:center; gap:16px 24px}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms !important; animation-iteration-count:1 !important; transition-duration:.01ms !important}
  html{scroll-behavior:auto}
  .reveal, .js-reveal .reveal{opacity:1; translate:0 0}
}