/* Jednotný styl pro všechny HTML soubory - Fyzika a chemie */

:root {
    --primary-color: #005A9C;
    --secondary-color: #00AEEF;
    --accent-color: #FDBB30;
    --bg-color: #f9f9f9;
    --text-color: #333;
    --header-color: #2c3e50;
    --border-color: #e0e0e0;
    --shadow: 0 4px 12px rgba(0,0,0,0.08);
    --formula-bg: #fff3cd;
    --formula-border: #ffc107;
    --result-bg: #d4edda;
    --result-border: #28a745;
    --note-bg: #e8f4fd;
    --note-border: #2196f3;
}

/* Základní styly pro celou stránku */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-color);
    margin: 0;
    padding: 0;
}

/* Hlavní kontejner pro obsah */
main {
    max-width: 1100px;
    margin: 20px auto;
    padding: 20px;
}

/* Styly pro hlavičku */
header {
    text-align: center;
    padding: 30px 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

header h1 {
    margin: 0;
    font-size: 2.8em;
    font-weight: 600;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

header p {
    margin: 10px 0 0 0;
    font-size: 1.2em;
    opacity: 0.9;
    font-weight: 300;
}

/* Styly pro sekce */
section {
    background: white;
    padding: 25px;
    margin: 25px 0;
    border-radius: 12px;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary-color);
}

section h2 {
    color: var(--header-color);
    margin: 0 0 20px 0;
    font-size: 1.8em;
    font-weight: 600;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

section h3 {
    color: var(--primary-color);
    margin: 25px 0 15px 0;
    font-size: 1.3em;
    font-weight: 600;
}

/* Styly pro tabulky */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    box-shadow: var(--shadow);
    border-radius: 8px;
    overflow: hidden;
}

thead {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

thead th {
    padding: 15px 12px;
    text-align: left;
    font-weight: 600;
    font-size: 1.1em;
}

tbody tr {
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.2s ease;
}

tbody tr:hover {
    background-color: #f8f9fa;
}

tbody tr:nth-child(even) {
    background-color: #fafbfc;
}

tbody td {
    padding: 12px;
    font-size: 1em;
}

.variable {
    font-weight: 600;
    color: var(--primary-color);
    font-style: italic;
}

.value {
    font-weight: 700;
    color: var(--accent-color);
    background-color: #fef9e7;
    padding: 2px 6px;
    border-radius: 4px;
}

.unit {
    font-style: italic;
    color: #666;
    font-size: 0.9em;
}

/* Styly pro vzorce */
.formula-box {
    background-color: var(--formula-bg);
    border: 2px solid var(--formula-border);
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    text-align: center;
}

.formula-box strong {
    color: var(--header-color);
    font-size: 1.1em;
    display: block;
    margin-bottom: 10px;
}

/* Styly pro výsledky */
.result-box {
    background-color: var(--result-bg);
    border: 2px solid var(--result-border);
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    text-align: center;
}

.result-box strong {
    color: var(--header-color);
    font-size: 1.3em;
    display: block;
    margin-bottom: 10px;
}

/* Styly pro poznámky */
.note-box {
    background-color: var(--note-bg);
    border: 2px solid var(--note-border);
    border-radius: 8px;
    padding: 15px;
    margin: 20px 0;
}

.note-box strong {
    color: var(--primary-color);
    font-size: 1.1em;
}

/* Styly pro kroky postupu */
article {
    margin: 25px 0;
    padding: 20px;
    background: #fafbfc;
    border-radius: 8px;
    border-left: 4px solid var(--secondary-color);
}

/* Responsive design */
@media (max-width: 768px) {
    main {
        margin: 10px;
        padding: 15px;
    }

    header h1 {
        font-size: 2.2em;
    }

    section {
        padding: 20px;
        margin: 20px 0;
    }

    table {
        font-size: 0.9em;
    }

    thead th, tbody td {
        padding: 10px 8px;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.8em;
    }

    section h2 {
        font-size: 1.5em;
    }

    table {
        font-size: 0.8em;
    }

    thead th, tbody td {
        padding: 8px 6px;
    }
}

/* ========================================= */
/* EDUKATIVNÍ PRVKY PRO ZLEPŠENÍ VÝUKY     */
/* ========================================= */

/* Oddělovač sekcí */
.section-separator {
    border: none;
    border-top: 1px dashed #e0e0e0;
    margin: 20px 0;
}

/* Úvodní kontext */
.intro-context {
    background-color: #f8f9fa;
    border-left: 4px solid var(--secondary-color);
    padding: 15px;
    margin: 20px 0;
    border-radius: 6px;
    font-style: italic;
    color: #495057;
}

/* Edukativní boxy */
.tip-box, .warning-box, .analogy-box, .interpretation-box, .summary-box, .equation-logic-box, .alternative-method-box, .info-box {
    padding: 12px 15px;
    margin: 15px 0;
    border-radius: 6px;
    font-size: 0.95em;
    line-height: 1.5;
    position: relative;
    padding-left: 45px; /* Místo pro ikonu */
}

/* Tip box - tipy a rady */
.tip-box {
    background-color: #fffbe6;
    border-left: 4px solid #ffcc00;
    color: #8a6d00;
}
.tip-box::before {
    content: '💡';
    position: absolute;
    left: 15px;
    top: 12px;
    font-size: 1.2em;
}

/* Warning box - upozornění na chyby */
.warning-box {
    background-color: #fff0f0;
    border-left: 4px solid #ff4d4f;
    color: #a30000;
}
.warning-box::before {
    content: '⚠️';
    position: absolute;
    left: 15px;
    top: 12px;
    font-size: 1.2em;
}

/* Analogy box - praktické analogie */
.analogy-box {
    background-color: #e6ffe6;
    border-left: 4px solid #33cc33;
    color: #006600;
}
.analogy-box::before {
    content: '🌍';
    position: absolute;
    left: 15px;
    top: 12px;
    font-size: 1.2em;
}

/* Interpretation box - fyzikální interpretace */
.interpretation-box {
    background-color: #f0e6ff;
    border-left: 4px solid #9933ff;
    color: #4d0080;
}
.interpretation-box::before {
    content: '📈';
    position: absolute;
    left: 15px;
    top: 12px;
    font-size: 1.2em;
}

/* Summary box - shrnutí */
.summary-box {
    background-color: #e0f2f7;
    border-left: 4px solid #00bcd4;
    color: #006064;
    font-weight: bold;
}
.summary-box::before {
    content: '✅';
    position: absolute;
    left: 15px;
    top: 12px;
    font-size: 1.2em;
}

/* Equation logic box - logika výběru rovnice */
.equation-logic-box {
    background-color: #f8f8f8;
    border-left: 4px solid #888;
    color: #555;
}
.equation-logic-box::before {
    content: '🧠';
    position: absolute;
    left: 15px;
    top: 12px;
    font-size: 1.2em;
}

/* Alternative method box - alternativní postupy */
.alternative-method-box {
    background-color: #f0f8ff;
    border-left: 4px solid #6699ff;
    color: #003366;
}
.alternative-method-box::before {
    content: '🔄';
    position: absolute;
    left: 15px;
    top: 12px;
    font-size: 1.2em;
}

/* Info box - obecné informace */
.info-box {
    background-color: #e6f7ff;
    border-left: 4px solid #3399ff;
    color: #225a80;
}
.info-box::before {
    content: 'ℹ️';
    position: absolute;
    left: 15px;
    top: 12px;
    font-size: 1.2em;
}

/* Rozbalovací sekce */
details {
    margin: 15px 0;
    background-color: #f9f9f9;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
}

summary {
    font-weight: bold;
    padding: 10px 15px;
    cursor: pointer;
    outline: none;
    list-style: none;
    color: var(--primary-color);
    background-color: #f1f3f4;
    border-radius: 6px 6px 0 0;
}

summary::-webkit-details-marker {
    display: none;
}

summary::before {
    content: '▶️ ';
    margin-right: 8px;
    transition: transform 0.2s;
}

details[open] summary::before {
    content: '🔽 ';
    transform: rotate(90deg);
}

details p, details ul, details div {
    padding: 0 15px 10px 15px;
    margin: 10px 0;
}

details[open] summary {
    border-radius: 6px 6px 0 0;
    border-bottom: 1px solid #e0e0e0;
}

/* Vizualizace situace */
.situation-visual {
    background-color: #f8f9fa;
    border: 2px dashed #6c757d;
    padding: 15px;
    margin: 15px 0;
    border-radius: 8px;
    text-align: center;
    font-family: monospace;
    color: #495057;
}

/* Vylepšené calculation-step */
.calculation-step {
    background-color: #ffffff;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.calculation-step h4 {
    color: var(--primary-color);
    margin-top: 0;
    margin-bottom: 15px;
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 8px;
}

/* Responsive úpravy pro edukativní prvky */
@media (max-width: 768px) {
    .tip-box, .warning-box, .analogy-box, .interpretation-box, .summary-box, .equation-logic-box, .alternative-method-box, .info-box {
        padding-left: 15px;
        font-size: 0.9em;
    }

    .tip-box::before, .warning-box::before, .analogy-box::before, .interpretation-box::before, .summary-box::before, .equation-logic-box::before, .alternative-method-box::before, .info-box::before {
        display: none; /* Skryj ikony na mobilech pro lepší čitelnost */
    }
}