:root{
  color-scheme: dark;
  --lbg-bg:#121212; --lbg-header:#1a1a1a; --lbg-card:#1e1e1e; --lbg-sunken:#181818;
  --lbg-nav:#111; --lbg-border:#333; --lbg-border-subtle:#2a2a2a;
  --lbg-text:#eee; --lbg-muted:#999; --lbg-soft:#bbb;
  --lbg-link:#81c784; --lbg-accent:#2e7d32; --lbg-accent-2:#66bb6a;
  --lbg-ghost-bg:#2a2a2a; --lbg-ghost-fg:#ddd; --lbg-ghost-hover:#3a3a3a;
  --lbg-nav-hover:#2a2a2a; --lbg-board-opacity:0.16;
  --lbg-container:clamp(1160px, 85%, 1760px);
}
html[data-theme="light"]{
  color-scheme: light;
  --lbg-bg:#f3f4f6; --lbg-header:#ffffff; --lbg-card:#e8eaee; --lbg-sunken:#dfe3ea;
  --lbg-nav:#eef0f3; --lbg-border:#d8dbe2; --lbg-border-subtle:#e2e5eb;
  --lbg-text:#1c1d21; --lbg-muted:#6b7280; --lbg-soft:#4b5563;
  --lbg-link:#1b6e3a; --lbg-accent:#1f8a38; --lbg-accent-2:#43a047;
  --lbg-ghost-bg:#eceef2; --lbg-ghost-fg:#2a2d34; --lbg-ghost-hover:#d8dce4;
  --lbg-nav-hover:#e0e3e9; --lbg-board-opacity:0.1;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body.lbg{
  background:var(--lbg-bg); color:var(--lbg-text);
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  -webkit-font-smoothing:antialiased;
}
.lbg a{color:var(--lbg-link);text-decoration:none}
.lbg a:hover{color:var(--lbg-accent-2)}
.lbg h1,.lbg h2,.lbg h3,.lbg p{margin:0}
.lbg-wrap{max-width:var(--lbg-container);margin:0 auto;padding:0 20px}

/* header */
.lbg-header{position:sticky;top:0;z-index:10;background:var(--lbg-header);border-bottom:1px solid var(--lbg-border-subtle)}
.lbg-header__inner{max-width:var(--lbg-container);margin:0 auto;padding:12px 20px;display:flex;align-items:center;gap:16px}
.lbg .lbg-logo{display:flex;align-items:baseline;gap:8px;color:var(--lbg-text);font-weight:700;font-size:1.05rem;letter-spacing:-.01em;flex:0 0 auto}
.lbg .lbg-logo:hover{color:var(--lbg-text)}
.lbg-nav{display:flex;gap:4px;margin-left:auto;background:var(--lbg-nav);padding:4px;border-radius:10px;overflow-x:auto;scrollbar-width:none}
.lbg-nav::-webkit-scrollbar{display:none}
.lbg-nav a{flex:0 0 auto;white-space:nowrap;color:var(--lbg-soft);padding:8px 10px;border-radius:8px;font-weight:600;font-size:.85rem}
.lbg-nav a:hover{background:var(--lbg-nav-hover);color:var(--lbg-text)}
.lbg-header__actions{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.lbg-theme{width:40px;height:40px;display:inline-flex;align-items:center;justify-content:center;border:0;border-radius:50%;background:var(--lbg-ghost-bg);color:var(--lbg-ghost-fg);cursor:pointer}
.lbg-theme:hover{background:var(--lbg-ghost-hover)}
.lbg-theme svg{width:18px;height:18px}

/* buttons */
.lbg-btn{display:inline-flex;align-items:center;justify-content:center;text-align:center;min-height:48px;padding:12px 24px;border-radius:10px;font-weight:600;font-size:.98rem;line-height:1.3}
.lbg-btn--sm{min-height:40px;padding:8px 16px;border-radius:8px;font-size:.85rem;white-space:nowrap}
.lbg .lbg-btn--primary{background:var(--lbg-accent);color:#fff}
.lbg .lbg-btn--primary:hover{background:var(--lbg-accent-2);color:#fff}
.lbg .lbg-btn--ghost{background:var(--lbg-ghost-bg);color:var(--lbg-ghost-fg);border:1px solid var(--lbg-border)}
.lbg .lbg-btn--ghost:hover{background:var(--lbg-ghost-hover);color:var(--lbg-text)}
.lbg-btns{display:flex;flex-wrap:wrap;gap:12px}

/* hero */
.lbg-hero{position:relative;overflow:hidden;border-bottom:1px solid var(--lbg-border-subtle)}
.lbg-hero__inner{position:relative;max-width:var(--lbg-container);margin:0 auto;padding:96px 20px 88px}
.lbg-eyebrow{font-size:.8rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--lbg-link)}
.lbg-hero h1{margin-top:20px;font-size:clamp(2.1rem,5.2vw,3.6rem);line-height:1.08;letter-spacing:-.025em;font-weight:700;max-width:20ch;text-wrap:pretty}
.lbg .lbg-hero__lead{margin-top:28px;font-size:clamp(1rem,1.6vw,1.2rem);line-height:1.6;color:var(--lbg-soft);max-width:62ch;text-wrap:pretty}
.lbg-hero .lbg-btns{margin-top:36px}

/* sections */
.lbg-section{max-width:var(--lbg-container);margin:0 auto;padding:88px 20px 24px}
.lbg-section--last{padding-bottom:96px}
.lbg-section h2{font-size:clamp(1.6rem,3vw,2.3rem);line-height:1.15;letter-spacing:-.02em;font-weight:700}
.lbg .lbg-section__lead{margin-top:18px;font-size:1rem;line-height:1.6;color:var(--lbg-soft);max-width:60ch;text-wrap:pretty}

/* service cards */
.lbg-grid{margin-top:40px;display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,320px),1fr));gap:16px}
.lbg-card{display:flex;flex-direction:column;background:var(--lbg-card);border:1px solid var(--lbg-border);border-radius:14px;padding:24px}
.lbg-card__num{font-size:.75rem;font-weight:700;letter-spacing:.1em;color:var(--lbg-muted)}
.lbg-card h3{margin-top:12px;font-size:1.2rem;font-weight:700;letter-spacing:-.01em}
.lbg-card p{margin-top:14px;font-size:.95rem;line-height:1.6;color:var(--lbg-soft);text-wrap:pretty}
.lbg-card__link{margin-top:auto;padding-top:20px;font-size:.9rem;font-weight:600}

/* steps */
.lbg-steps{margin-top:40px;display:flex;flex-direction:column;gap:24px}
.lbg-step{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr));gap:24px;align-items:center;background:var(--lbg-sunken);border:1px solid var(--lbg-border-subtle);border-radius:16px;padding:28px}
.lbg-step__label{font-size:.75rem;font-weight:700;letter-spacing:.1em;color:var(--lbg-link)}
.lbg-step h3{margin-top:12px;font-size:1.35rem;font-weight:700;letter-spacing:-.015em}
.lbg-step p{margin-top:16px;font-size:.98rem;line-height:1.65;color:var(--lbg-soft);text-wrap:pretty}
.lbg-step__media{min-height:230px;border-radius:12px;overflow:hidden;background:var(--lbg-card);border:1px dashed var(--lbg-border);display:flex;align-items:center;justify-content:center;color:var(--lbg-muted);font-size:.85rem;text-align:center;padding:16px}
.lbg-shotbox{position:relative;display:block;width:100%;aspect-ratio:4/3;padding:12px;border:1px solid var(--lbg-border);border-radius:12px;background:var(--lbg-card);cursor:zoom-in}
.lbg-shotbox:hover{border-color:var(--lbg-accent-2)}
.lbg-shotbox img{width:100%;height:100%;object-fit:contain}
.lbg-shotbox .lbg-shot--dark{display:block}
.lbg-shotbox .lbg-shot--light{display:none}
html[data-theme="light"] .lbg-shotbox .lbg-shot--dark{display:none}
html[data-theme="light"] .lbg-shotbox .lbg-shot--light{display:block}

/* lightbox */
.lbg-lightbox{position:fixed;inset:0;z-index:50;background:rgba(0,0,0,.88);display:flex;align-items:center;justify-content:center;padding:32px;cursor:zoom-out}
.lbg-lightbox[hidden]{display:none}
.lbg-lightbox img{max-width:100%;max-height:100%;object-fit:contain;border-radius:8px}
.lbg-lightbox__close{position:absolute;top:20px;right:20px;width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;border:0;border-radius:50%;background:rgba(255,255,255,.14);color:#fff;font-size:1.4rem;line-height:1;cursor:pointer}
.lbg-lightbox__close:hover{background:rgba(255,255,255,.24)}

/* panel (guides) */
.lbg-panel{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr));gap:28px;align-items:center;background:var(--lbg-card);border:1px solid var(--lbg-border);border-radius:16px;padding:36px}
.lbg-panel h2{font-size:clamp(1.5rem,2.6vw,2rem);line-height:1.18;letter-spacing:-.02em;font-weight:700}
.lbg-panel p{margin-top:18px;font-size:1rem;line-height:1.65;color:var(--lbg-soft);text-wrap:pretty}
.lbg-panel .lbg-btn{font-size:.95rem}

/* cta */
.lbg-cta{border:1px solid var(--lbg-border);border-radius:16px;padding:48px 36px;text-align:center;background:var(--lbg-sunken)}
.lbg-cta h2{font-size:clamp(1.6rem,3vw,2.2rem);line-height:1.15;letter-spacing:-.02em;font-weight:700}
.lbg-cta p{margin:18px auto 0;font-size:1rem;line-height:1.65;color:var(--lbg-soft);max-width:52ch;text-wrap:pretty}
.lbg-cta .lbg-btns{margin-top:32px;justify-content:center}

/* footer */
.lbg-footer{border-top:1px solid var(--lbg-border-subtle);background:var(--lbg-header)}
.lbg-footer__inner{max-width:var(--lbg-container);margin:0 auto;padding:36px 20px;display:flex;flex-wrap:wrap;gap:20px;align-items:center;justify-content:space-between}
.lbg-footer b{font-weight:700;font-size:1rem}
.lbg .lbg-footer__note{margin-top:6px;font-size:.88rem;color:var(--lbg-muted)}
.lbg-footer__links{display:flex;flex-wrap:wrap;gap:20px;align-items:center;font-size:.9rem}

/* бургер */
.lbg-burger{display:none;width:40px;height:40px;align-items:center;justify-content:center;border:0;border-radius:50%;background:var(--lbg-ghost-bg);color:var(--lbg-ghost-fg);cursor:pointer}
.lbg-burger:hover{background:var(--lbg-ghost-hover)}
.lbg-burger svg{width:20px;height:20px}
.lbg-burger__close{display:none}
.lbg-burger[aria-expanded="true"] .lbg-burger__open{display:none}
.lbg-burger[aria-expanded="true"] .lbg-burger__close{display:block}
.lbg-nav__cta{display:none}

@media (max-width:820px){
  .lbg-burger{display:inline-flex}
  .lbg-header__login{display:none}
  .lbg-header__inner{position:relative}
  /* nav уходит из потока, поэтому его margin-left:auto больше не работает —
     кнопки прижимаем вправо явно */
  .lbg-header__actions{margin-left:auto}
  .lbg-nav{
    position:absolute;top:calc(100% + 8px);left:20px;right:20px;
    flex-direction:column;align-items:stretch;gap:2px;
    margin-left:0;padding:8px;border-radius:12px;overflow:visible;
    background:var(--lbg-header);border:1px solid var(--lbg-border);
    box-shadow:0 12px 28px rgba(0,0,0,.28);
    display:none;
  }
  .lbg-nav.is-open{display:flex}
  .lbg-nav a{padding:12px 14px;font-size:.95rem}
  /* Все скриншоты портретные и вписываются по высоте, поэтому рост
     высоты бокса = рост самой картинки: 16/15 вместо 4/3 даёт ~+25%. */
  .lbg-shotbox{aspect-ratio:16/15;padding:10px}
  .lbg .lbg-nav__cta{
    display:block;margin-top:6px;text-align:center;font-weight:600;
    background:var(--lbg-accent);color:#fff;border-radius:8px;
  }
  .lbg .lbg-nav__cta:hover{background:var(--lbg-accent-2);color:#fff}
}

/* Десктоп: базовые размеры макета на широких экранах читаются мелко —
   поднимаем типографику и воздух примерно на 15%. Ниже 1024px всё как было. */
@media (min-width:1024px){
  .lbg-header__inner{padding:16px 20px;gap:20px}
  .lbg .lbg-logo{font-size:1.35rem}
  .lbg-nav{padding:5px}
  .lbg-nav a{font-size:1rem;padding:11px 15px}
  .lbg-theme{width:50px;height:50px}
  .lbg-theme svg{width:22px;height:22px}
  .lbg-btn{min-height:54px;padding:14px 30px;font-size:1.08rem}
  .lbg-btn--sm{min-height:50px;padding:12px 22px;font-size:1rem}

  .lbg-hero__inner{padding:120px 20px 108px}
  .lbg-eyebrow{font-size:.92rem}
  .lbg-hero h1{font-size:clamp(3.6rem,4.4vw,4.6rem)}
  .lbg .lbg-hero__lead{margin-top:32px;font-size:clamp(1.2rem,1.4vw,1.45rem);max-width:60ch}

  .lbg-section{padding:108px 20px 24px}
  .lbg-section--last{padding-bottom:116px}
  .lbg-section h2{font-size:clamp(2.3rem,2.7vw,3rem)}
  .lbg .lbg-section__lead{margin-top:22px;font-size:clamp(1.1rem,1.2vw,1.25rem);max-width:62ch}

  .lbg-grid{margin-top:48px;gap:20px}
  .lbg-card{padding:30px}
  .lbg-card__num{font-size:.85rem}
  .lbg-card h3{margin-top:14px;font-size:1.4rem}
  .lbg-card p{margin-top:16px;font-size:1.08rem}
  .lbg-card__link{padding-top:24px;font-size:1.02rem}

  .lbg-steps{margin-top:48px;gap:28px}
  .lbg-step{padding:40px;gap:36px}
  .lbg-step__label{font-size:.85rem}
  .lbg-step h3{font-size:1.6rem}
  .lbg-step p{margin-top:18px;font-size:1.12rem}

  .lbg-panel{padding:48px;gap:40px}
  .lbg-panel h2{font-size:clamp(2rem,2.4vw,2.5rem)}
  .lbg-panel p{margin-top:22px;font-size:1.12rem}
  .lbg-panel .lbg-btn{font-size:1.02rem}

  .lbg-cta{padding:64px 48px}
  .lbg-cta h2{font-size:clamp(2.2rem,2.6vw,2.8rem)}
  .lbg-cta p{margin-top:22px;font-size:1.15rem}

  .lbg-footer__inner{padding:48px 20px}
  .lbg-footer b{font-size:1.15rem}
  .lbg-footer__note{font-size:1rem}
  .lbg-footer__links{font-size:1rem;gap:24px}
}