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padding: 80px 0;
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<body>
<nav class="navbar navbar-expand-lg navbar-dark bg-dark sticky-top">
<div class="container">
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<li class="nav-item"><a class="nav-link active" href="#">Početna</a></li>
<li class="nav-item"><a class="nav-link" href="#">O nama</a></li>
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<div class="ad-slot-horizontal">
<p class="m-0">Oglasni prostor (728x90)</p>
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</div>
<header class="hero-section text-center">
<div class="container">
<h1 class="display-4 mb-3">Matematika za sve uzraste</h1>
<p class="lead mb-4">Besplatni zadaci, rješenja i video lekcije od 1. do 10. razreda.</p>
<div class="row justify-content-center">
<div class="col-md-6">
<div class="input-group mb-3">
<input type="text" class="form-control form-control-lg" placeholder="Što želiš učiti danas? (npr. Razlomci)">
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<main class="container py-5">
<section class="mb-5">
<h2 class="text-center section-title">Razredna nastava (1. - 4.)</h2>
<div class="row g-4">
<div class="col-sm-6 col-lg-3">
<div class="card h-100 border-warning">
<div class="card-header bg-lower-grade text-center fw-bold">1. RAZRED</div>
<div class="card-body">
<p class="card-text">Brojevi do 20, zbrajanje i oduzimanje, geometrijska tijela.</p>
</div>
<div class="card-footer bg-white border-top-0 text-center pb-3">
<a href="#" class="btn btn-outline-warning w-100">Kreni</a>
</div>
</div>
</div>
<div class="col-sm-6 col-lg-3">
<div class="card h-100 border-warning">
<div class="card-header bg-lower-grade text-center fw-bold">2. RAZRED</div>
<div class="card-body">
<p class="card-text">Brojevi do 100, tablica množenja i dijeljenja.</p>
</div>
<div class="card-footer bg-white border-top-0 text-center pb-3">
<a href="#" class="btn btn-outline-warning w-100">Kreni</a>
</div>
</div>
</div>
<div class="col-sm-6 col-lg-3">
<div class="card h-100 border-warning">
<div class="card-header bg-lower-grade text-center fw-bold">3. RAZRED</div>
<div class="card-body">
<p class="card-text">Brojevi do 1000, pisano računanje, opseg i površina.</p>
</div>
<div class="card-footer bg-white border-top-0 text-center pb-3">
<a href="#" class="btn btn-outline-warning w-100">Kreni</a>
</div>
</div>
</div>
<div class="col-sm-6 col-lg-3">
<div class="card h-100 border-warning">
<div class="card-header bg-lower-grade text-center fw-bold">4. RAZRED</div>
<div class="card-body">
<p class="card-text">Brojevi do milijun, razlomci, kutovi.</p>
</div>
<div class="card-footer bg-white border-top-0 text-center pb-3">
<a href="#" class="btn btn-outline-warning w-100">Kreni</a>
</div>
</div>
</div>
</div>
</section>
<div class="ad-slot-horizontal my-5">
<p class="m-0">Oglasni prostor (Banner)</p>
</div>
<section class="mb-5">
<h2 class="text-center section-title">Predmetna nastava (5. - 8.)</h2>
<div class="row g-4">
<div class="col-sm-6 col-lg-3">
<div class="card h-100 border-primary">
<div class="card-header bg-upper-grade text-center fw-bold">5. RAZRED</div>
<div class="card-body">
<p class="card-text">Skupovi, djeljivost, decimalni brojevi, razlomci.</p>
</div>
<div class="card-footer bg-white border-top-0 text-center pb-3">
<a href="#" class="btn btn-outline-primary w-100">Kreni</a>
</div>
</div>
</div>
<div class="col-sm-6 col-lg-3">
<div class="card h-100 border-primary">
<div class="card-header bg-upper-grade text-center fw-bold">6. RAZRED</div>
<div class="card-body">
<p class="card-text">Cijeli brojevi, racionalni brojevi, trokut, četverokut.</p>
</div>
<div class="card-footer bg-white border-top-0 text-center pb-3">
<a href="#" class="btn btn-outline-primary w-100">Kreni</a>
</div>
</div>
</div>
<div class="col-sm-6 col-lg-3">
<div class="card h-100 border-primary">
<div class="card-header bg-upper-grade text-center fw-bold">7. RAZRED</div>
<div class="card-body">
<p class="card-text">Koordinatni sustav, proporcionalnost, mnogokuti.</p>
</div>
<div class="card-footer bg-white border-top-0 text-center pb-3">
<a href="#" class="btn btn-outline-primary w-100">Kreni</a>
</div>
</div>
</div>
<div class="col-sm-6 col-lg-3">
<div class="card h-100 border-primary">
<div class="card-header bg-upper-grade text-center fw-bold">8. RAZRED</div>
<div class="card-body">
<p class="card-text">Kvadriranje, Pitagora, realni brojevi, geometrija.</p>
</div>
<div class="card-footer bg-white border-top-0 text-center pb-3">
<a href="#" class="btn btn-outline-primary w-100">Kreni</a>
</div>
</div>
</div>
</div>
</section>
<section class="mb-5">
<h2 class="text-center section-title">Srednja škola</h2>
<div class="row g-4 justify-content-center">
<div class="col-md-6 col-lg-5">
<div class="card h-100 border-secondary">
<div class="card-header bg-high-school text-center fw-bold">1. SREDNJE (9. Razred)</div>
<div class="card-body">
<p class="card-text">Potencije, algebarski izrazi, linearne jednadžbe.</p>
</div>
<div class="card-footer bg-white border-top-0 text-center pb-3">
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</div>
</div>
<div class="col-md-6 col-lg-5">
<div class="card h-100 border-secondary">
<div class="card-header bg-high-school text-center fw-bold">2. SREDNJE (10. Razred)</div>
<div class="card-body">
<p class="card-text">Kvadratna jednadžba, funkcije, kompleksni brojevi.</p>
</div>
<div class="card-footer bg-white border-top-0 text-center pb-3">
<a href="#" class="btn btn-outline-secondary w-100">Kreni</a>
</div>
</div>
</div>
</div>
</section>
<section class="py-5 bg-light rounded-3">
<div class="row text-center">
<div class="col-md-4 mb-3">
<i class="fas fa-list-ol fa-3x text-primary mb-3"></i>
<h4>Postupna rješenja</h4>
<p class="text-muted">Svaki zadatak ima objašnjenje korak po korak.</p>
</div>
<div class="col-md-4 mb-3">
<i class="fas fa-print fa-3x text-primary mb-3"></i>
<h4>Spremno za ispis</h4>
<p class="text-muted">Preuzmi zadatke u PDF formatu za vježbu.</p>
</div>
<div class="col-md-4 mb-3">
<i class="fas fa-mobile-alt fa-3x text-primary mb-3"></i>
<h4>Uči bilo gdje</h4>
<p class="text-muted">Stranica je potpuno prilagođena mobitelima.</p>
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</section>
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<h5>MathCentar</h5>
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<h5>Brzi linkovi</h5>
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<li><a href="#" class="text-white-50 text-decoration-none">Svi razredi</a></li>
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