/* Global Variables and Basic Styles */
:root {
    --achtergrond-kleur: #1e293b;
    --tekst-kleur: #f8fafc;
    --accent-kleur: #3b82f6;
    --rand-kleur: #475569;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: var(--achtergrond-kleur);
    color: var(--tekst-kleur);
}

/* Header and Navigation */
header {
    background: var(--rand-kleur);
    padding: 2rem 0;
    text-align: center;
    border-bottom: 2px solid var(--accent-kleur);
    position: relative;
}

header h1 {
    margin: 0;
    color: var(--accent-kleur);
    font-size: 2.5rem;
}

/* Home Button */
.home-button {
    position: absolute;
    top: 1.5rem;
    left: 1rem;
    padding: 0.5rem 1rem;
    background-color: var(--accent-kleur);
    color: var(--tekst-kleur);
    text-decoration: none;
    border-radius: 0.5rem;
    font-weight: bold;
    transition: background-color 0.3s;
}

.home-button:hover {
    background-color: #2563eb;
}

/* Main Content Layout */
.overzicht {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    padding: 2rem;
    text-align: center;
}

.collectie-link {
    background-color: var(--rand-kleur);
    color: var(--tekst-kleur);
    padding: 1.5rem 3rem;
    border-radius: 1rem;
    text-decoration: none;
    font-size: 1.25rem;
    font-weight: bold;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
    transition: transform 0.2s, box-shadow 0.2s;
    border: 2px solid var(--accent-kleur);
    color: var(--accent-kleur);
}

.collectie-link:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 12px rgba(0, 0, 0, 0.3);
}

#collectie-container {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    align-items: center;
}

.cd-item {
    background-color: var(--rand-kleur);
    border: 2px solid var(--accent-kleur);
    border-radius: 1rem;
    padding: 1.5rem;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    gap: 2rem;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 1200px;
}

.cd-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 12px rgba(0, 0, 0, 0.3);
}

.cd-details {
    flex: 1;
}

.cd-details h3 {
    margin: 0 0 1rem 0;
    color: var(--accent-kleur);
    font-size: 1.5rem;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
}

.cd-details p {
    margin: 0.25rem 0;
}

.cd-cover-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    flex-shrink: 0;
    width: 250px;
}

.cd-cover-container img {
    width: 250px;
    height: auto;
    border: 2px solid var(--accent-kleur);
    border-radius: 0.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
}

.discogs-button {
    display: block;
    width: 250px;
    transition: transform 0.2s;
}

.discogs-button:hover {
    transform: scale(1.05);
}

.discogs-button img {
    width: 100%;
    height: auto;
    border: none;
    box-shadow: none;
}

/* Filter and Sort */
.filter-sort-container {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.5rem;
    padding: 0 1rem;
    margin-bottom: 2rem;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

#sorteerOptie, #filterJaar {
    padding: 0.5rem;
    font-size: 1rem;
    border: 2px solid var(--accent-kleur);
    background-color: var(--rand-kleur);
    color: var(--tekst-kleur);
    border-radius: 0.5rem;
    cursor: pointer;
}

#sorteerOptie:focus, #filterJaar:focus {
    outline: none;
    border-color: #f8fafc;
}

/* Zoekpagina specifieke stijlen */
.zoekbalk-container {
    display: flex;
    justify-content: center;
    padding: 1rem;
}

#zoekbalk {
    width: 100%;
    max-width: 1200px;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border: 2px solid var(--accent-kleur);
    border-radius: 0.5rem;
    background-color: var(--rand-kleur);
    color: var(--tekst-kleur);
    transition: box-shadow 0.3s;
}

#zoekbalk:focus {
    outline: none;
    border-color: #f8fafc;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.5);
}

/* Utility Classes */
.geen-resultaten {
    text-align: center;
    margin-top: 2rem;
    color: var(--tekst-kleur);
}

.zoek-instructie {
    text-align: center;
    margin-top: 2rem;
    color: #cbd5e1;
    font-style: italic;
}

/* Scroll to Top Button */
#scrollToTopBtn {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 30px;
    z-index: 99;
    font-size: 24px;
    border: none;
    outline: none;
    background-color: var(--accent-kleur);
    color: var(--tekst-kleur);
    cursor: pointer;
    padding: 15px;
    border-radius: 50%;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    transition: background-color 0.3s;
}

#scrollToTopBtn:hover {
    background-color: #2563eb;
}

/* --- Footer Styling --- */
footer {
    background-color: var(--rand-kleur);
    color: var(--tekst-kleur);
    text-align: center;
    padding: 1rem;
    margin-top: 2rem;
    border-top: 2px solid var(--accent-kleur);
}

footer p {
    margin: 0.5rem 0;
}

/* --- Contactpagina Styling --- */
.contact-container {
    background-color: var(--rand-kleur);
    border: 2px solid var(--accent-kleur);
    border-radius: 1rem;
    padding: 2rem;
    max-width: 600px;
    width: 100%;
    margin-top: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
    text-align: left;
}

.contact-form .form-group {
    margin-bottom: 1.5rem;
}

.contact-form label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
    color: var(--accent-kleur);
}

.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--rand-kleur);
    border-radius: 0.5rem;
    background-color: #334155;
    color: var(--tekst-kleur);
    box-sizing: border-box;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--accent-kleur);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.5);
}

.contact-form .submit-button {
    background-color: var(--accent-kleur);
    color: var(--tekst-kleur);
    padding: 1rem 2rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s;
    font-weight: bold;
    display: block;
    width: 100%;
}

.contact-form .submit-button:hover {
    background-color: #2563eb;
}

/* --- Media Queries voor Mobiele Weergave --- */
@media (max-width: 768px) {
    /* Hoofdpagina knoppen */
    .collectie-link {
        padding: 1rem 2rem;
        font-size: 1rem;
    }
    
    /* Home-knop */
    .home-button {
        position: static;
        margin-bottom: 1rem;
    }

    /* Header titels */
    header h1 {
        font-size: 1.75rem;
    }

    /* Container voor albums/singles */
    .cd-item {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 1.5rem;
    }
    
    /* Cover en Discogs knop */
    .cd-cover-container {
        width: 100%;
        max-width: 250px;
    }

    .discogs-button {
        width: 100%;
        max-width: 250px;
    }
    
    /* Zoekbalk */
    #zoekbalk {
        max-width: 100%;
    }

    /* Filter en sorteeropties */
    .filter-sort-container {
        flex-direction: column;
        gap: 1rem;
    }

    .filter-group {
        flex-direction: column;
        gap: 0.25rem;
    }

    /* Contactpagina mobiel */
    .contact-container {
        padding: 1.5rem;
    }
}

/* -------------------------------------------------------------------------- */
/* Stijlen voor W3C Validator Icoontjes (toegevoegd)                          */
/* -------------------------------------------------------------------------- */

/* Container voor het centreren van de icoontjes in de footer */
.validator-icons {
    display: flex;
    justify-content: center; /* Centreer de icoontjes horizontaal */
    align-items: center;
    gap: 10px; /* Ruimte tussen de icoontjes */
    margin-top: 15px; /* Ruimte boven de icoontjes */
}

/* Stijl voor de icoontjes zelf */
.validator-icons img {
    height: 31px; /* Standaardhoogte voor W3C icoontjes */
    width: auto;
    border: none;
    opacity: 0.8; /* Maak ze iets minder prominent */
    transition: opacity 0.3s ease;
}

/* Visuele feedback bij hover */
.validator-icons a:hover img {
    opacity: 1.0;
}