:root {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --accent: #0284c7;
    --accent-hover: #0369a1;
    --border-color: #cbd5e1;
    --error-color: #dc2626;
    --math-color: #1e3a8a;
}

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    display: block;
}

header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

header h1 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

/* --- SEKCJA TRYBU UPROSZCZONEGO (WIDŻET) --- */
.mode-selector {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.mode-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.switch {
    position: relative;
    display: inline-block;
    width: 46px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border-color);
    transition: background-color 0.2s ease;
    border-radius: 24px;
}

.slider::before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: #ffffff;
    transition: transform 0.2s ease;
    border-radius: 50%;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}

.switch input:checked+.slider {
    background-color: var(--accent);
}

.switch input:checked+.slider::before {
    transform: translateX(22px);
}

.switch input:focus-visible+.slider {
    outline: 2px solid var(--text-primary);
    outline-offset: 2px;
}

/* --- NAWIGACJA DESKTOP --- */
.menu-toggle-btn {
    display: none;
}

nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

nav a {
    display: inline-block;
    padding: 0.4rem 0.8rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    border-radius: 4px;
    border: 1px solid transparent;
    transition: all 0.2s ease;
}

nav a:hover {
    background-color: var(--bg-primary);
    color: var(--accent);
    border-color: var(--border-color);
}

nav a.active {
    background-color: var(--accent);
    color: var(--bg-secondary);
    border-color: var(--accent);
}

/* --- KONTENER GŁÓWNY I TREŚĆ --- */
main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1.5rem;
}

#view-container {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 2.5rem;
    min-height: 400px;
}

#view-container h2 {
    font-size: 1.8rem;
    color: var(--accent);
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

#view-container h3 {
    font-size: 1.3rem;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

#view-container p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
    text-align: justify;
}

#view-container ul,
#view-container ol {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

#view-container li {
    margin-bottom: 0.25rem;
}

#view-container table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 0.95rem;
}

#view-container th,
#view-container td {
    border: 1px solid var(--border-color);
    padding: 0.75rem;
    text-align: left;
}

#view-container th {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-weight: 600;
}

#view-container tr:nth-child(even) {
    background-color: rgba(248, 250, 252, 0.6);
}

.math {
    font-family: "Times New Roman", Times, serif;
    font-style: italic;
    font-weight: bold;
    color: var(--math-color);
}

div.math-block {
    text-align: center;
    margin: 1.5rem 0;
    font-size: 1.1rem;
}

.error {
    color: var(--error-color);
    background-color: #fef2f2;
    border: 1px solid #fca5a5;
    padding: 1rem;
    border-radius: 4px;
    font-weight: 500;
}

/* --- STRUKTURA BLOKÓW WIEDZY --- */
.concept-block {
    display: block;
    margin-bottom: 1.5rem;
}

.tech-desc {
    width: 100%;
}

.slang-desc {
    display: none;
    background-color: #fef08a;
    border-left: 4px solid #eab308;
    padding: 1rem;
    border-radius: 0 4px 4px 0;
    font-size: 0.9rem;
    color: #713f12;
    margin-top: 0.5rem;
}

body.simplified-mode .slang-desc {
    display: block;
}

/* --- REPREZENTACJA WERSJI MOBILNEJ ORAZ TRYBÓW WYŚWIETLANIA --- */

/* Konfiguracja dla Desktopu (Szerokie ekrany) */
@media (min-width: 769px) {
    body.simplified-mode .concept-block {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 2rem;
        align-items: start;
        border-bottom: 1px dashed var(--border-color);
        padding-bottom: 1.5rem;
        margin-bottom: 1.5rem;
    }

    body.simplified-mode .slang-desc {
        margin-top: 0;
    }
}
/* Konfiguracja dla urządzeń mobilnych */
@media (max-width: 768px) {
    header {
        padding: 0.75rem 1rem;
    }

    .menu-toggle-btn {
        display: block;
        width: 100%;
        padding: 0.6rem;
        background-color: var(--bg-primary);
        border: 1px solid var(--border-color);
        color: var(--text-primary);
        border-radius: 4px;
        font-weight: 600;
        cursor: pointer;
        font-size: 0.9rem;
        text-align: left;
        position: relative;
    }

    .menu-toggle-btn::after {
        content: "▼";
        position: absolute;
        right: 1rem;
        font-size: 0.8rem;
        color: var(--text-secondary);
    }

    /* KORREKTA: Lista całkowicie ukryta w stanie domyślnym (brak scrolla w bok) */
    nav ul {
        display: none;
        list-style: none;
        margin-top: 0.25rem;
        padding: 0;
    }

    /* KORREKTA: Tylko pionowy układ elementów i czysty scroll w dół */
    nav ul.open {
        display: block;
        /* Zmiana z flex na block wymusza naturalne układanie pod sobą */
        max-height: 220px;
        overflow-y: auto;
        /* Scroll tylko pionowy */
        overflow-x: hidden;
        /* Blokada scrolla poziomego */
        border: 1px solid var(--border-color);
        border-radius: 4px;
        background-color: var(--bg-secondary);
        box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    }

    nav ul.open li {
        display: block;
        width: 100%;
    }

    nav ul.open li:not(:last-child) {
        border-bottom: 1px solid var(--bg-primary);
    }

    nav a {
        display: block;
        width: 100%;
        padding: 0.6rem 0.75rem;
        font-size: 0.85rem;
        border-radius: 0;
        box-sizing: border-box;
    }

    nav a.active {
        background-color: rgba(2, 132, 199, 0.1);
        color: var(--accent);
        font-weight: 600;
    }

    #view-container {
        padding: 1.25rem;
    }

    #view-container table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }

    body.simplified-mode .concept-block {
        display: flex;
        flex-direction: column;
        gap: 0.75rem;
        border-bottom: 1px dashed var(--border-color);
        padding-bottom: 1.25rem;
        margin-bottom: 1.25rem;
    }

    body.simplified-mode .slang-desc {
        width: 100%;
    }
}