:root{
  --bg:#ffffff; --bg-alt:#f4f7fb; --ink:#0f1b2d; --muted:#53627a; --line:#e2e8f0;
  --brand:#1747d6; --brand-dark:#0f2f94; --accent:#0fb5a0; --card:#ffffff;
  --radius:16px; --shadow:0 10px 30px rgba(15,27,45,.08);
}
@media (prefers-color-scheme: dark){
  :root{--bg:#0c1423;--bg-alt:#111c30;--ink:#eaf0fb;--muted:#9fb0c9;--line:#22304a;--card:#14213a;--brand:#5b8bff;--brand-dark:#8aa9ff;--shadow:0 10px 30px rgba(0,0,0,.35)}
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--ink);line-height:1.6}
img,svg{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{width:min(1120px,100% - 32px);margin-inline:auto}
section{padding:80px 0}
.alt{background:var(--bg-alt)}
h1{font-size:clamp(2.1rem,5vw,3.4rem);line-height:1.12;letter-spacing:-.02em}
h2{font-size:clamp(1.6rem,3.4vw,2.2rem);line-height:1.2;letter-spacing:-.01em}
h3{font-size:1.15rem}
.lead{font-size:1.15rem;color:var(--muted);max-width:60ch}
.eyebrow{display:inline-block;font-size:.8rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--brand);margin-bottom:12px}
.section-head{max-width:700px;margin-bottom:44px}
.section-head p{color:var(--muted);margin-top:10px}

/* header */
header.site{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.15rem}
.logo i{width:32px;height:32px;border-radius:9px;background:linear-gradient(135deg,var(--brand),var(--accent));display:grid;place-items:center;color:#fff;font-style:normal;font-size:.9rem}
.nav ul{display:flex;gap:26px;list-style:none;align-items:center}
.nav ul a{font-size:.95rem;color:var(--muted);font-weight:500}
.nav ul a:hover{color:var(--ink)}
.menu-btn{display:none;background:none;border:1px solid var(--line);border-radius:10px;padding:8px 12px;color:var(--ink);font-size:1rem;cursor:pointer}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 24px;border-radius:12px;font-weight:600;border:1px solid transparent;cursor:pointer;font-size:1rem;transition:.2s}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-dark);transform:translateY(-1px)}
.btn-ghost{border-color:var(--line);background:var(--card);color:var(--ink)}
.btn-ghost:hover{border-color:var(--brand)}
.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}

/* hero */
.hero{padding:84px 0 70px;background:radial-gradient(900px 400px at 85% -10%,color-mix(in srgb,var(--brand) 14%,transparent),transparent),var(--bg)}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.hero p.lead{margin-top:20px}
.hero h1 span{color:var(--brand)}

/* mock UI illustration */
.mock{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.mock-bar{display:flex;gap:6px;padding:12px 14px;border-bottom:1px solid var(--line);background:var(--bg-alt)}
.mock-bar b{width:10px;height:10px;border-radius:50%;background:var(--line)}
.mock-body{padding:18px;display:grid;gap:12px}
.mock-row{display:flex;gap:10px}
.mock-kpi{flex:1;background:var(--bg-alt);border-radius:10px;padding:12px}
.mock-kpi small{color:var(--muted);font-size:.7rem}
.mock-kpi div{height:10px;width:60%;background:var(--brand);border-radius:6px;margin-top:8px;opacity:.85}
.mock-line{height:10px;border-radius:6px;background:var(--line)}
.mock-chart{height:110px;border-radius:10px;background:linear-gradient(180deg,color-mix(in srgb,var(--brand) 18%,transparent),transparent);position:relative;overflow:hidden}
.mock-chart svg{position:absolute;inset:0;width:100%;height:100%}
.mock-note{font-size:.72rem;color:var(--muted);text-align:center;padding:0 0 12px}

/* cards */
.grid{display:grid;gap:22px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;transition:.2s}
.card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.card p{color:var(--muted);margin-top:8px;font-size:.97rem}
.ico{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;font-size:1.4rem;background:color-mix(in srgb,var(--brand) 12%,transparent);margin-bottom:16px}
.product .tag{font-size:.75rem;font-weight:700;color:var(--accent);text-transform:uppercase;letter-spacing:.06em}
.product ul{margin:14px 0 20px 18px;color:var(--muted);font-size:.95rem}
.link{color:var(--brand);font-weight:600}
.link:hover{text-decoration:underline}

/* split sections */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.split.rev .split-text{order:2}
.checks{list-style:none;margin-top:18px;display:grid;gap:10px}
.checks li{padding-left:30px;position:relative;color:var(--muted)}
.checks li::before{content:"✓";position:absolute;left:0;top:0;width:20px;height:20px;border-radius:50%;background:color-mix(in srgb,var(--accent) 20%,transparent);color:var(--accent);font-size:.75rem;font-weight:800;display:grid;place-items:center;margin-top:3px}

/* steps */
.step b{display:inline-grid;place-items:center;width:36px;height:36px;border-radius:50%;background:var(--brand);color:#fff;margin-bottom:12px}

/* faq */
details{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 20px;margin-bottom:12px}
summary{cursor:pointer;font-weight:600}
details p{color:var(--muted);margin-top:10px}

/* cta band + form */
.cta-band{background:linear-gradient(135deg,var(--brand-dark),var(--brand));color:#fff;border-radius:24px;padding:56px 40px;text-align:center}
.cta-band p{opacity:.9;margin:12px auto 0;max-width:56ch}
.cta-band .btn-primary{background:#fff;color:var(--brand-dark)}
form.contact{display:grid;gap:14px}
form.contact input,form.contact textarea,form.contact select{width:100%;padding:13px 14px;border-radius:10px;border:1px solid var(--line);background:var(--card);color:var(--ink);font:inherit}
form.contact input:focus,form.contact textarea:focus,form.contact select:focus{outline:2px solid var(--brand);border-color:transparent}
.todo{font-size:.8rem;color:var(--muted)}

/* footer */
footer.site{border-top:1px solid var(--line);padding:48px 0 28px;background:var(--bg-alt)}
.foot{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px}
.foot h4{margin-bottom:12px;font-size:.95rem}
.foot a,.foot p{color:var(--muted);font-size:.93rem;display:block;margin-bottom:6px}
.foot a:hover{color:var(--brand)}
.copy{margin-top:32px;padding-top:18px;border-top:1px solid var(--line);font-size:.85rem;color:var(--muted)}

/* whatsapp float */
.wa{position:fixed;right:18px;bottom:18px;z-index:60;background:#25d366;color:#fff;width:56px;height:56px;border-radius:50%;display:grid;place-items:center;font-size:1.6rem;box-shadow:0 8px 20px rgba(0,0,0,.25)}

/* product page hero accents */
body.p-sifweb{--brand:#0b6e6e;--brand-dark:#07504f;--accent:#e0a100}
body.p-studio{--brand:#c2255c;--brand-dark:#8f1a44;--accent:#f08c00}
@media (prefers-color-scheme: dark){
  body.p-sifweb{--brand:#2fc7c7;--brand-dark:#6ee0e0}
  body.p-studio{--brand:#ff6fa3;--brand-dark:#ff9ec1}
}

@media (max-width:900px){
  section{padding:56px 0}
  .hero-grid,.split{grid-template-columns:1fr}
  .split.rev .split-text{order:0}
  .g3,.g4,.g2{grid-template-columns:1fr}
  .foot{grid-template-columns:1fr}
  .menu-btn{display:block}
  .nav ul{display:none;position:absolute;top:68px;left:0;right:0;background:var(--bg);flex-direction:column;padding:20px 16px;border-bottom:1px solid var(--line);align-items:flex-start}
  .nav ul.open{display:flex}
  .cta-band{padding:40px 22px}
}