/* PALETA I ZMIENNE */
:root {
    --bg-body: #f8fafc;
    --bg-card: #ffffff;
    --primary: #1d4ed8;
    --primary-light: #3b82f6;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --white: #ffffff;
    --shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.05);
}

body.dark-mode {
    --bg-body: #020617;
    --bg-card: #0f172a;
    --primary: #3b82f6;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #1e293b;
    --shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.3);
}

/* RESET */
* { margin: 0; padding: 0; box-sizing: border-box; transition: all 0.3s ease; }
body { font-family: 'Plus Jakarta Sans', sans-serif; background: var(--bg-body); color: var(--text-main); line-height: 1.6; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
ul { list-style: none; }
a { text-decoration: none; color: inherit; }

/* HEADER */
header {
    background: var(--bg-card);
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
    position: sticky; top: 0; z-index: 1000;
}
.logo { font-size: 1.4rem; font-weight: 800; color: var(--primary); letter-spacing: -1px; }
.logo span { color: var(--text-main); }
.nav-links { display: flex; gap: 30px; }
.nav-links a { font-weight: 600; font-size: 0.9rem; color: var(--text-muted); }
.nav-links a:hover { color: var(--primary); }

#theme-toggle {
    background: var(--primary); color: white; border: none; padding: 8px 16px; border-radius: 8px; cursor: pointer; font-weight: 600;
}

/* HERO EXPANDED */
.hero-expanded { padding: 100px 5%; text-align: center; background: radial-gradient(circle at top right, rgba(37, 99, 235, 0.1), transparent); }
.badge { background: rgba(37, 99, 235, 0.1); color: var(--primary); padding: 5px 15px; border-radius: 20px; font-size: 0.8rem; font-weight: 700; }
.hero-expanded h1 { font-size: 4rem; font-weight: 800; margin: 20px 0; letter-spacing: -2px; line-height: 1.1; }
.text-gradient { background: linear-gradient(90deg, var(--primary), var(--primary-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero-expanded p { max-width: 700px; margin: 0 auto 40px; font-size: 1.2rem; color: var(--text-muted); }

.btn { padding: 12px 28px; border-radius: 12px; font-weight: 700; display: inline-block; cursor: pointer; }
.btn-primary { background: var(--primary); color: white; border: none; }
.btn-primary:hover { background: var(--primary-light); transform: translateY(-3px); }
.btn-outline { border: 2px solid var(--border); margin-left: 15px; }

/* CATEGORIES */
.categories { margin-top: -50px; position: relative; z-index: 10; }
.category-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; }
.cat-card { background: var(--bg-card); padding: 30px; border-radius: 20px; border: 1px solid var(--border); text-align: center; box-shadow: var(--shadow); }
.cat-card:hover { border-color: var(--primary); transform: translateY(-5px); }
.cat-icon { font-size: 2.5rem; margin-bottom: 15px; }

/* FEATURED SECTION */
.section-title { margin: 60px 0 30px; font-size: 1.8rem; font-weight: 800; letter-spacing: -1px; }
.featured-banner { background: linear-gradient(135deg, var(--primary) 0%, #1e40af 100%); border-radius: 30px; padding: 60px; color: white; position: relative; overflow: hidden; }
.featured-text { position: relative; z-index: 2; max-width: 500px; }
.featured-text h2 { font-size: 2.5rem; margin: 15px 0; }
.featured-text .tag { background: rgba(255,255,255,0.2); color: white; }
.read-link { font-weight: 700; margin-top: 20px; display: block; border-bottom: 2px solid white; width: fit-content; }

/* ARTICLES GRID */
.main-layout { display: grid; grid-template-columns: 1fr 320px; gap: 40px; }
.articles-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); gap: 25px; }
.article-card-v2 { background: var(--bg-card); border-radius: 20px; border: 1px solid var(--border); overflow: hidden; display: flex; flex-direction: column; }
.article-img-placeholder { height: 200px; background: #e2e8f0; display: flex; align-items: center; justify-content: center; font-weight: 800; color: #94a3b8; font-size: 1.5rem; }
.card-body { padding: 25px; }
.tag { font-size: 0.7rem; font-weight: 800; color: var(--primary); text-transform: uppercase; letter-spacing: 1px; }
.card-body h3 { margin: 10px 0; font-size: 1.4rem; }
.card-body p { color: var(--text-muted); font-size: 0.95rem; margin-bottom: 15px; }
.meta { font-size: 0.8rem; color: var(--text-muted); border-top: 1px solid var(--border); padding-top: 15px; }

/* SIDEBAR */
.sidebar-box { background: var(--bg-card); border: 1px solid var(--border); padding: 25px; border-radius: 20px; margin-bottom: 25px; }
.sidebar-box h4 { margin-bottom: 15px; }
.ebook-preview { background: var(--primary); color: white; padding: 20px; border-radius: 12px; margin-top: 15px; }
.stat-item { display: flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid var(--border); }

/* NEWSLETTER FULL */
.newsletter-full { background: var(--bg-card); border-top: 1px solid var(--border); padding: 80px 5%; text-align: center; margin-top: 80px; }
.newsletter-content h2 { font-size: 2.5rem; margin-bottom: 15px; }
.newsletter-form { max-width: 500px; margin: 30px auto; display: flex; gap: 10px; }
.newsletter-form input { flex: 1; padding: 15px; border-radius: 10px; border: 1px solid var(--border); background: var(--bg-body); color: var(--text-main); }

/* FOOTER */
footer { background: var(--bg-card); border-top: 1px solid var(--border); padding: 80px 5% 30px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; max-width: 1200px; margin: 0 auto; }
.footer-col h4 { margin-bottom: 20px; }
.footer-col ul li { margin-bottom: 10px; color: var(--text-muted); font-size: 0.9rem; }
.footer-bottom { text-align: center; margin-top: 60px; padding-top: 30px; border-top: 1px solid var(--border); color: var(--text-muted); font-size: 0.8rem; }

/* MOBILE */
@media (max-width: 900px) {
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .main-layout { grid-template-columns: 1fr; }
    .hero-expanded h1 { font-size: 2.5rem; }
    .featured-banner { padding: 30px; }
    .nav-links { display: none; }
}

/* --- STYLE DLA HAMBURGERA --- */
.hamburger {
    display: none; /* Ukryty na komputerze */
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    z-index: 1100;
    padding: 10px;
}

.hamburger span {
    display: block;
    width: 28px;
    height: 3px;
    background-color: var(--text-main);
    border-radius: 3px;
    transition: 0.3s;
}

/* RESPONSYWNOŚĆ (Ekrany poniżej 900px) */
@media (max-width: 900px) {
    .hamburger {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%; /* Menu schowane za prawą krawędzią */
        width: 80%;
        height: 100vh;
        background: var(--glass);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 30px;
        transition: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
        border-left: 1px solid var(--border);
        box-shadow: -10px 0 30px rgba(0,0,0,0.1);
        z-index: 1050;
    }

    .nav-links.active {
        right: 0; /* Menu wysunięte */
    }

    /* Animacja hamburgera w "X" */
    .hamburger.active span:nth-child(1) {
        transform: translateY(9px) rotate(45deg);
        background-color: var(--primary);
    }
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    .hamburger.active span:nth-child(3) {
        transform: translateY(-9px) rotate(-45deg);
        background-color: var(--primary);
    }

    .nav-links li a {
        font-size: 1.5rem; /* Większe linki na telefonie */
    }
}

/* --- NEWSLETTER SYSTEM --- */
.newsletter-section {
    padding: 80px 0;
}

.newsletter-card {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-radius: 40px;
    padding: 60px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    color: white;
    box-shadow: 0 30px 60px rgba(37, 99, 235, 0.25);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.newsletter-content h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin: 20px 0;
    letter-spacing: -1px;
}

.newsletter-content p {
    max-width: 600px;
    margin-bottom: 40px;
    opacity: 0.9;
    font-size: 1.1rem;
}

.newsletter-form {
    display: flex;
    gap: 15px;
    width: 100%;
    max-width: 500px;
}

.newsletter-form input {
    flex: 1;
    padding: 18px 25px;
    border-radius: 15px;
    border: none;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    color: white;
    font-family: inherit;
    font-size: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.newsletter-form input::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

.btn-white {
    background: white;
    color: var(--primary);
    padding: 18px 30px;
    border-radius: 15px;
    font-weight: 800;
    border: none;
    cursor: pointer;
    transition: 0.3s;
}

.btn-white:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    background: #f8fafc;
}

@media (max-width: 768px) {
    .newsletter-card { padding: 40px 20px; }
    .newsletter-form { flex-direction: column; }
    .newsletter-content h2 { font-size: 1.8rem; }
}