/* =========================
   Root Variables
========================= */
:root {
    --bg: #0f0f14;
    --card: #1a1a22;
    --accent: #e63946;
    --text: #f1f1f1;
    --muted: #a8a8b3;
    --radius: 16px;
}

/* =========================
   Base Reset
========================= */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

/* =========================
   Layout
========================= */
.container {
    max-width: 1100px;
    margin: auto;
    padding: 3rem 1.5rem;
}

/* =========================
   Header Section
========================= */
header {
    padding: 4rem 1.5rem 2rem;
    text-align: center;
    background: linear-gradient(135deg, #1a1a22, #121218);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

header p {
    color: var(--muted);
    max-width: 700px;
    margin: 0 auto;
}

/* =========================
   Navigation
========================= */
.navbar {
    position: sticky;
    top: 0;
    background: rgba(15,15,20,0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #222;
    z-index: 100;
}

.nav-container {
    max-width: 1100px;
    margin: auto;
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--muted);
    transition: 0.2s ease;
}

.nav-links a.active,
.nav-links a:hover {
    color: var(--accent);
}

/* =========================
   Beginner Series Highlight
========================= */
.beginner-series {
    margin-bottom: 3rem;
    padding: 1.5rem;
    background: var(--card);
    border-left: 5px solid var(--accent);
    border-radius: var(--radius);
}

.beginner-series h2 {
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.beginner-series p {
    color: var(--muted);
    margin-bottom: 1rem;
}

.beginner-series .cta a {
    display: inline-block;
    background: var(--accent);
    color: var(--text);
    padding: 0.6rem 1.2rem;
    border-radius: 12px;
    text-decoration: none;
    transition: 0.3s ease;
}

.beginner-series .cta a:hover {
    background: #ff4757;
}

/* =========================
   Categories
========================= */
.category {
    margin-bottom: 3rem;
}

.category h2 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

.category p {
    color: var(--muted);
    margin-bottom: 1.5rem;
}

/* =========================
   Cards
========================= */
.grid {
    display: grid;
    gap: 2rem;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card {
    background: var(--card);
    padding: 1.8rem;
    border-radius: var(--radius);
    transition: 0.3s ease;
    text-decoration: none;
    color: inherit;
    border: 1px solid #262633;
}

.card:hover {
    transform: translateY(-6px);
    border-color: var(--accent);
}

.card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.6rem;
}

.card p {
    color: var(--muted);
    font-size: 0.92rem;
}

/* =========================
   Tags
========================= */
.tag {
    display: inline-block;
    margin-bottom: 0.6rem;
    font-size: 0.7rem;
    padding: 0.3rem 0.6rem;
    border-radius: 50px;
    background: rgba(230,57,70,0.15);
    color: var(--accent);
    text-transform: uppercase;
}

/* =========================
   Footer
========================= */
footer {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--muted);
    border-top: 1px solid #222;
}

footer a {
    color: var(--muted);
    text-decoration: none;
}

footer a:hover {
    color: var(--accent);
}


/* =========================
   Responsive Adjustments
========================= */

/* Small screens (mobile) */
@media (max-width: 768px) {

    .container {
        padding: 2rem 1rem;
    }

    header h1 {
        font-size: 2rem;
    }

    header p {
        font-size: 0.95rem;
    }

    /* Beginner Series: horizontal scroll */
    .beginner-series .grid {
        display: flex;
        overflow-x: auto;
        gap: 1rem;
        padding-bottom: 0.5rem;
        scroll-snap-type: x mandatory;
        -webkit-overflow-scrolling: touch;
    }

    .beginner-series .grid::-webkit-scrollbar {
        display: none; /* hide scrollbar on mobile */
    }

    .beginner-series .card {
        min-width: 240px;
        flex: 0 0 auto;
        scroll-snap-align: start;
    }

    /* Adjust other grids to single column if needed */
    .grid:not(.beginner-series .grid) {
        grid-template-columns: 1fr;
    }
}