/* ==========================================================================
   KÖZÖS STÍLUSLAP (style.css)
   Gépészeti Statika és Szilárdságtan Digitális Tananyag
   ========================================================================== */

/* --- 1. Változók és Alapbeállítások --- */
:root {
    --primary: #0056b3;
    --primary-hover: #004494;
    --secondary: #e2e8f0;
    --text-main: #000000;
    --text-muted: #2c3e50;
    --bg-light: #f8fafc;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    --purple: #8b5cf6;
    --dark: #1e293b;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-light);
    color: var(--text-main);
    line-height: 1.8;
    padding: 40px;
    max-width: 1000px;
    margin: 0 auto;
}

.container {
    background-color: #ffffff;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

/* --- 2. Tipográfia --- */
h1 { color: var(--primary); font-size: 2.2rem; margin-bottom: 20px; border-bottom: 3px solid var(--primary); padding-bottom: 10px; }
h2 { color: var(--text-muted); font-size: 1.5rem; margin-top: 40px; margin-bottom: 15px; border-left: 4px solid var(--primary); padding-left: 10px;}
h3 { color: var(--text-muted); font-size: 1.2rem; margin-top: 20px; margin-bottom: 10px; }
h4 { margin-top: 0; margin-bottom: 10px; }
p { color: var(--text-muted); margin-bottom: 15px; font-size: 1.05rem; }

/* --- 3. Kiemelt dobozok és Matematika --- */
.highlight { background-color: rgba(0, 86, 179, 0.05); padding: 25px; border-left: 4px solid var(--primary); margin: 30px 0; border-radius: 8px; }
.danger-box { background-color: rgba(239, 68, 68, 0.05); padding: 25px; border-left: 4px solid var(--danger); margin: 30px 0; border-radius: 8px; }

.math-box { font-size: 1.3rem; margin: 20px 0; padding: 20px; background-color: var(--bg-light); border-radius: 8px; border: 1px dashed var(--primary); text-align: center; }
.math-desc { font-size: 0.95rem; color: var(--text-muted); margin-top: 10px; text-align: left; line-height: 1.6;}

/* --- 4. Rácsrendszerek (Grids) --- */
.grid-2col { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; margin: 30px 0; }
.grid-3col { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; margin: 30px 0; }
.support-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 25px; margin: 30px 0; }
.load-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 25px; margin: 30px 0; }
.reaction-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; margin: 30px 0; }
.euler-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; margin: 30px 0; }
.property-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; margin: 30px 0; }
.force-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 25px; margin: 30px 0; }

/* --- 5. Kártyák --- */
/* Alap kártya (Concept) */
.concept-card { background: #fff; border: 2px solid var(--secondary); border-radius: 10px; padding: 30px; box-shadow: 0 4px 6px rgba(0,0,0,0.02); transition: transform 0.2s; position: relative;}
.concept-card:hover { transform: translateY(-5px); border-color: var(--primary); box-shadow: 0 10px 20px rgba(0,0,0,0.05); }
.concept-card h3 { margin-top: 0; color: var(--dark); border-bottom: 2px solid var(--secondary); padding-bottom: 10px; font-size: 1.4rem; display: flex; align-items: center; gap: 10px;}

.concept-card.safe { border-top: 5px solid var(--success); }
.concept-card.danger { border-top: 5px solid var(--danger); }
.zone-top { border-top: 6px solid var(--warning); }
.zone-mid { border-top: 6px solid var(--secondary); }
.zone-bot { border-top: 6px solid var(--info); }
.card-tension { border-top: 6px solid var(--info); }
.card-compression { border-top: 6px solid var(--warning); }

/* Sztori / Gyakorlati kártya (Sötét) */
.story-card, .practical-card { background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%); color: white; padding: 35px; border-radius: 12px; margin: 40px 0; box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.2); }
.story-card h2, .practical-card h2 { color: var(--warning); border: none; padding: 0; margin-top: 0; font-size: 1.8rem;}
.story-card p, .practical-card p { color: #cbd5e1; font-size: 1.1rem; line-height: 1.7;}
.story-card strong, .practical-card strong { color: white; }

/* Specifikus kártyák */
.shape-card { background: #fff; border: 2px solid var(--secondary); border-radius: 8px; padding: 20px; text-align: center; transition: transform 0.2s; }
.shape-card:hover { transform: translateY(-5px); border-color: var(--primary); }
.shape-card h4 { color: var(--primary); margin-top: 0; border-bottom: 2px solid var(--secondary); padding-bottom: 10px; }

.equilibrium-card { background: #fff; border: 2px solid var(--secondary); border-radius: 8px; padding: 20px; }
.eq-stable { border-top: 5px solid var(--success); }
.eq-unstable { border-top: 5px solid var(--danger); }
.eq-neutral { border-top: 5px solid var(--warning); }

.support-card { background: #ffffff; border: 2px solid var(--secondary); border-radius: 10px; padding: 25px; transition: transform 0.3s ease, box-shadow 0.3s ease; }
.support-card:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0,0,0,0.05); }
.support-card.roller { border-top: 6px solid var(--info); }
.support-card.pinned { border-top: 6px solid var(--warning); }
.support-card.fixed { border-top: 6px solid var(--danger); }

.load-card { background: #ffffff; border: 2px solid var(--secondary); border-radius: 10px; padding: 25px; transition: transform 0.3s ease; display: flex; flex-direction: column; }
.load-card:hover { transform: translateY(-5px); border-color: var(--primary); }
.load-card.point { border-top: 6px solid var(--danger); }
.load-card.distributed { border-top: 6px solid var(--info); }

.reaction-card { background: #fff; border: 2px solid var(--secondary); border-radius: 8px; padding: 20px; text-align: center; box-shadow: 0 4px 6px rgba(0,0,0,0.02); transition: transform 0.2s; }
.reaction-card:hover { transform: translateY(-5px); border-color: var(--primary); }

.phase-card { background: #fff; border: 2px solid var(--secondary); border-radius: 8px; padding: 20px; margin-bottom: 15px; box-shadow: 0 2px 4px rgba(0,0,0,0.02); transition: transform 0.2s; }
.phase-card:hover { transform: translateX(10px); border-color: var(--primary); }

.euler-card { background: #fff; border: 2px solid var(--secondary); border-radius: 8px; padding: 20px; text-align: center; box-shadow: 0 4px 6px rgba(0,0,0,0.02); transition: transform 0.2s; }
.euler-card:hover { transform: translateY(-5px); border-color: var(--primary); }

.property-card { background: #fff; border: 2px solid var(--secondary); border-radius: 10px; padding: 20px; text-align: center; transition: transform 0.2s; box-shadow: 0 4px 6px rgba(0,0,0,0.02); }
.property-card:hover { transform: translateY(-5px); border-color: var(--primary); box-shadow: 0 10px 15px rgba(0,0,0,0.05);}

.force-card { background: #ffffff; border: 2px solid var(--secondary); border-radius: 10px; padding: 25px; position: relative; transition: transform 0.3s ease; }
.force-card:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0,0,0,0.05); }
.card-N { border-top: 5px solid var(--success); }
.card-V { border-top: 5px solid var(--info); }
.card-M { border-top: 5px solid var(--danger); }

/* --- 6. Listák --- */
ul.custom-list, ul.rule-list, ul.case-list { list-style: none; padding: 0; margin-bottom: 20px;}
ul.custom-list li, ul.rule-list li, ul.case-list li { position: relative; padding-left: 35px; margin-bottom: 15px; color: var(--text-muted); font-size: 1.05rem; }
ul.custom-list li::before { content: "🔹"; position: absolute; left: 0; top: 2px; font-size: 1.2rem; }
ul.rule-list li::before { content: "📏"; position: absolute; left: 0; top: 2px; font-size: 1.2rem; }
ul.case-list li::before { content: "🛠️"; position: absolute; left: 0; top: 2px; font-size: 1.2rem; }

.step-list { list-style: none; padding: 0; margin: 30px 0; counter-reset: step-counter; }
.step-list li { position: relative; padding-left: 60px; margin-bottom: 20px; background: var(--bg-light); border: 1px solid var(--secondary); padding-top: 20px; padding-bottom: 20px; padding-right: 25px; border-radius: 8px; }
.step-list li::before { content: counter(step-counter); counter-increment: step-counter; position: absolute; left: 15px; top: 20px; background: var(--primary); color: white; font-weight: bold; font-size: 1.2rem; width: 35px; height: 35px; border-radius: 50%; display: flex; align-items: center; justify-content: center; box-shadow: 0 2px 4px rgba(0,0,0,0.2); }
.step-list h4 { margin-top: 0; color: var(--primary); margin-bottom: 5px; font-size: 1.2rem;}

/* Grafikus lépések */
.step-container { margin: 20px 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 15px;}
.step { display: flex; background: var(--bg-light); border: 1px solid var(--secondary); border-radius: 8px; padding: 15px; align-items: flex-start;}
.step-number { background: var(--primary); color: white; font-weight: bold; font-size: 1.2rem; min-width: 35px; height: 35px; border-radius: 50%; display: flex; align-items: center; justify-content: center; margin-right: 15px; margin-top: 2px;}

/* --- 7. Jelvények (Badges) --- */
.unit-badge { align-self: flex-start; background: var(--dark); color: white; padding: 5px 12px; border-radius: 20px; font-family: monospace; font-size: 1.1rem; font-weight: bold; margin-bottom: 15px; }
.formula-name { display: inline-block; background: var(--dark); color: white; padding: 4px 12px; border-radius: 20px; font-size: 0.9rem; font-weight: bold; margin-bottom: 10px; letter-spacing: 1px; }
.factor-badge { background: var(--dark); color: white; padding: 5px 15px; border-radius: 20px; font-family: monospace; font-size: 1.1rem; font-weight: bold; display: inline-block; margin-top: 10px;}
.phase-num { background-color: var(--dark); color: white; width: 30px; height: 30px; display: inline-flex; justify-content: center; align-items: center; border-radius: 50%; font-size: 1rem;}
.symbol { position: absolute; top: -15px; right: 20px; background: var(--dark); color: white; font-weight: bold; font-size: 1.5rem; width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; border-radius: 50%; }

/* --- 8. Szimulátorok és Kalkulátorok --- */
.simulator-container, .animated-visualizer, .calc-container { background-color: var(--dark); color: white; padding: 30px; border-radius: 12px; margin-top: 40px; box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3); }
.sim-header, .visualizer-header, .calc-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 15px; border-bottom: 1px solid rgba(255,255,255,0.1); padding-bottom: 15px; margin-top: 0; }
.simulator-container h3, .animated-visualizer h3, .calc-container h2 { color: var(--warning); margin: 0; }

/* Vezérlők */
.controls { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 15px; }
.btn-mode { flex: 1; min-width: 120px; padding: 12px; border: none; border-radius: 6px; font-weight: bold; cursor: pointer; transition: 0.2s; background: #334155; color: white; }
.btn-mode.active { background: var(--primary); box-shadow: 0 0 10px rgba(0, 86, 179, 0.5); }
.btn-action { background: var(--warning); color: black; border: none; padding: 12px 20px; border-radius: 6px; font-weight: bold; cursor: pointer; text-transform: uppercase; }
.btn-action:hover { background: #d97706; }

.control-buttons { display: flex; gap: 10px; }
.btn-anim { flex: 1; padding: 12px; border-radius: 6px; border: none; font-weight: bold; cursor: pointer; transition: 0.2s; text-transform: uppercase; font-size: 0.9rem; }
.btn-prev { background: #475569; color: white; }
.btn-prev:hover { background: #334155; }
.btn-next { background: var(--primary); color: white; }
.btn-next:hover { background: var(--primary-hover); }
.btn-reset { background: var(--danger); color: white; flex: none; width: 50px; font-size: 1.2rem;}

/* Canvas / Visualizer */
.canvas-container, .visualizer-area, .canvas-wrapper { background: #0f172a; border-radius: 8px; border: 1px solid rgba(255,255,255,0.1); padding: 10px; display: flex; justify-content: center; overflow: hidden; }
canvas { max-width: 100%; height: auto; border-radius: 4px; }
.instruction-box { background: rgba(255,255,255,0.05); padding: 15px; border-radius: 8px; border-left: 4px solid var(--primary); min-height: 60px; display: flex; align-items: center; }
.instruction-box p { color: #e2e8f0; margin: 0; font-size: 1rem; font-weight: 500;}

/* Kalkulátor mezők */
.calc-layout { display: flex; flex-wrap: wrap; gap: 30px; margin-top: 20px; }
.calc-inputs { flex: 1 1 300px; display: flex; flex-direction: column; gap: 15px; }
.calc-visuals { flex: 1 1 400px; display: flex; flex-direction: column; gap: 15px; }
.calc-results { flex: 1 1 300px; display: flex; flex-direction: column; gap: 15px; justify-content: center;}

.input-group { background: rgba(255,255,255,0.05); padding: 15px; border-radius: 8px; border-left: 4px solid var(--primary); }
.input-group label { display: block; margin-bottom: 8px; color: #cbd5e1; font-weight: 600; font-size: 0.95rem;}
.input-group.green { border-left-color: var(--success); }
.input-group.blue { border-left-color: var(--info); }
input[type="range"] { width: 100%; margin-top: 5px;}
input[type="number"], select { width: 100%; padding: 8px; margin-top: 5px; border-radius: 4px; border: 1px solid var(--secondary); font-family: inherit; color: black; }
.val-display { color: var(--warning); font-weight: bold; font-size: 1.1rem; }

/* Kalkulátor eredmények */
.equations-box { margin-top: 20px; background: rgba(255,255,255,0.05); padding: 20px; border-radius: 8px; font-family: monospace; font-size: 1.1rem; line-height: 1.6; }
.eq-line { margin-bottom: 8px; border-bottom: 1px dashed rgba(255,255,255,0.1); padding-bottom: 8px; color: white;}
.eq-line:last-child { border: none; margin: 0; padding: 0; }
.res-high { color: var(--success); font-weight: bold; font-size: 1.2rem; }

.result-box { background: rgba(255,255,255,0.05); padding: 20px; border-radius: 8px; border: 1px dashed rgba(255,255,255,0.2); text-align: center; }
.result-title { color: #94a3b8; font-size: 0.95rem; margin-bottom: 10px; text-transform: uppercase; letter-spacing: 1px;}
.result-value { font-size: 2rem; font-weight: bold; font-family: monospace; }
.val-stress { color: var(--danger); }
.val-elongation { color: var(--success); }

.results-box { background: white; padding: 20px; border-radius: 8px; border: 1px solid var(--secondary); color: black; }
.res-line { display: flex; justify-content: space-between; margin-bottom: 10px; padding-bottom: 10px; border-bottom: 1px dashed var(--secondary); font-size: 1.1rem;}
.res-line:last-child { border: none; margin: 0; padding: 0; }
.res-val { font-weight: bold; font-family: monospace; }
.val-fa { color: var(--success); }
.val-ma { color: var(--danger); }

.final-result { background: rgba(245, 158, 11, 0.1); border: 1px solid var(--warning); padding: 15px; border-radius: 8px; text-align: center; font-size: 1.2rem; color: white; margin-top: 10px; }

/* --- 9. Táblázatok --- */
.table-container { margin: 30px 0; overflow-x: auto; border: 1px solid var(--secondary); border-radius: 8px; }
table { width: 100%; border-collapse: collapse; background: #ffffff; }
table th, table td { padding: 12px 15px; text-align: center; border-bottom: 1px solid var(--secondary); font-size: 0.95rem; color: black;}
table th { background-color: var(--dark); color: #ffffff; font-weight: 600; }
table tr:hover { background-color: rgba(0, 86, 179, 0.02); }

.math-table { background: rgba(255,255,255,0.05); color: white; font-family: monospace;}
.math-table th { background: rgba(0,0,0,0.3); color: var(--warning); border-color: rgba(255,255,255,0.1);}
.math-table td { border-color: rgba(255,255,255,0.1); color: white;}
.math-table tr.sum-row { background: rgba(16, 185, 129, 0.1); font-weight: bold; color: var(--success); }
.math-table tr:hover { background-color: rgba(255,255,255,0.1); }

/* --- 10. Harmonika (Details) --- */
details { background-color: #ffffff; border: 2px solid var(--secondary); border-radius: 8px; margin-bottom: 15px; overflow: hidden; transition: all 0.3s ease; color: black;}
details[open] { border-color: var(--primary); box-shadow: 0 4px 12px rgba(0, 86, 179, 0.1); }
summary { padding: 15px 20px; font-size: 1.1rem; font-weight: 600; color: var(--primary); cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; }
summary::-webkit-details-marker { padding: 0; }
summary::after { content: '+'; font-size: 1.5rem; transition: transform 0.3s ease; }
details[open] summary::after { transform: rotate(45deg); }
.details-content { padding: 0 20px 20px 20px; border-top: 1px solid var(--secondary); margin-top: 10px; padding-top: 15px; color: var(--text-muted); }

/* --- Reszponzivitás --- */
@media (max-width: 800px) {
    body { padding: 15px; }
    .container { padding: 20px; }
    .grid-2col, .grid-3col, .calc-layout { grid-template-columns: 1fr; }
}
/* ==========================================================================
   11. CSALÁDFA (FAMILY TREE) STÍLUSOK
   ========================================================================== */

.family-tree-container {
    width: 100%;
    overflow-x: auto; /* Ha nagyon szűk a képernyő, lehessen görgetni */
    padding: 20px 0;
    margin: 40px 0;
}

/* A fa alapstruktúrája */
.tree ul {
    padding-top: 20px; 
    position: relative;
    transition: all 0.5s;
    display: flex; 
    justify-content: center;
    padding-left: 0;
}

.tree li {
    text-align: center; 
    list-style-type: none;
    position: relative; 
    padding: 20px 10px 0 10px;
    transition: all 0.5s;
}

.tree li::before { content: ""; display: none; } /* Alapértelmezett lista ikon tiltása */

/* Összekötő vonalak rajzolása CSS-sel */
.tree li::before, .tree li::after {
    content: ''; 
    position: absolute; 
    top: 0; 
    right: 50%;
    border-top: 2px solid #cbd5e1;
    width: 50%; 
    height: 20px;
}

.tree li::after {
    right: auto; 
    left: 50%;
    border-left: 2px solid #cbd5e1;
}

.tree li:only-child::after, .tree li:only-child::before {
    display: none;
}

.tree li:only-child { padding-top: 0; }

.tree li:first-child::before, .tree li:last-child::after {
    border: 0 none;
}

.tree li:last-child::before {
    border-right: 2px solid #cbd5e1;
    border-radius: 0 5px 0 0;
}

.tree li:first-child::after {
    border-radius: 5px 0 0 0;
}

/* Fentről lefelé jövő vonal a gyermekekhez */
.tree ul ul::before {
    content: ''; 
    position: absolute; 
    top: 0; 
    left: 50%;
    border-left: 2px solid #cbd5e1;
    width: 0; 
    height: 20px;
}

/* Kártyák stílusai a fán belül */
.tree-card {
    background: #ffffff;
    border: 2px solid var(--secondary);
    padding: 15px;
    border-radius: 8px;
    display: inline-block;
    min-width: 160px;
    position: relative;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: transform 0.2s, box-shadow 0.2s;
}

.tree-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 15px rgba(0,0,0,0.1);
}

.tree-card h3 { margin: 0 0 5px 0; font-size: 1.2rem; border-bottom: none; padding-bottom: 0;}
.tree-card h4 { margin: 0 0 5px 0; font-size: 1.1rem; color: var(--dark);}
.tree-card p { margin: 0; font-size: 0.9rem; color: var(--text-muted); line-height: 1.4;}

/* Egyedi kártya színek */
.root-card { border-top: 6px solid var(--primary); background: var(--bg-light); border-color: var(--primary);}
.branch-solid { border-top: 5px solid var(--dark); }
.branch-fluid { border-top: 5px solid var(--info); }
.branch-gas { border-top: 5px solid var(--purple); }
.leaf-card { border-top: 4px solid var(--secondary); max-width: 200px; white-space: normal;}
.leaf-sub { border-top: 3px solid var(--secondary); padding: 10px; font-size: 0.9rem; margin-top: 5px;}

/* 📱 MOBIL NÉZET: Összecsukás függőleges "könyvtár" stílusba */
@media (max-width: 900px) {
    .tree ul { 
        display: block; 
        padding-top: 0; 
        padding-left: 20px; 
    }
    .tree li { 
        padding: 15px 0 0 20px; 
        text-align: left; 
        display: block; 
    }
    /* Vízszintes vonalak eltüntetése */
    .tree li::before, .tree li::after { display: none; }
    .tree ul ul::before { display: none; }
    
    /* Függőleges vonal a bal oldalon */
    .tree li { border-left: 2px solid #cbd5e1; }
    .tree li:last-child { border-left: none; }
    
    /* Bekanyarodó vonal az utolsó elemnél */
    .tree li:last-child::before {
        content: ''; 
        display: block; 
        position: absolute; 
        top: 0; 
        left: 0;
        border-left: 2px solid #cbd5e1;
        border-bottom: 2px solid #cbd5e1;
        width: 20px; 
        height: 40px; 
        border-radius: 0 0 0 8px;
    }
    
    /* Kártyák teljes szélességre húzása mobilon */
    .tree-card { 
        display: block; 
        width: 100%; 
        max-width: 100%;
        margin-bottom: 10px; 
    }
}
        /* Tudós kártyák elrendezése */
        .person-card {
            display: flex;
            background: #ffffff;
            border: 2px solid var(--secondary);
            border-radius: 8px;
            margin-bottom: 25px;
            overflow: hidden;
            box-shadow: 0 4px 6px rgba(0,0,0,0.02);
            transition: all 0.3s ease;
        }
        .person-card:hover {
            border-color: var(--primary);
            box-shadow: 0 6px 12px rgba(0, 86, 179, 0.1);
        }
        .person-img-container {
            flex: 0 0 200px;
            background-color: var(--secondary);
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }
        .person-img-container img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            filter: grayscale(20%);
            transition: filter 0.3s ease;
        }
        .person-card:hover .person-img-container img {
            filter: grayscale(0%);
        }
        .person-content {
            padding: 20px;
            flex: 1;
        }
        .person-content h3 {
            margin-top: 0;
            color: var(--primary);
            border-bottom: 1px solid var(--secondary);
            padding-bottom: 5px;
        }
        .quote {
            font-style: italic;
            color: var(--text-muted);
            border-left: 3px solid var(--warning);
            padding-left: 10px;
            margin: 10px 0;
            background-color: rgba(245, 158, 11, 0.05);
            padding: 10px;
        }

        /* Harmonika panelek */
        details {
            background-color: #ffffff;
            border: 2px solid var(--secondary);
            border-radius: 8px;
            margin-bottom: 15px;
            overflow: hidden;
            transition: all 0.3s ease;
        }
        details[open] {
            border-color: var(--primary);
            box-shadow: 0 4px 12px rgba(0, 86, 179, 0.1);
        }
        summary {
            padding: 15px 20px;
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--primary);
            cursor: pointer;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        summary::-webkit-details-marker {
            display: none;
        }
        summary::after {
            content: '+';
            font-size: 1.5rem;
            transition: transform 0.3s ease;
        }
        details[open] summary::after {
            transform: rotate(45deg);
        }
        .details-content {
            padding: 0 20px 20px 20px;
            border-top: 1px solid var(--secondary);
            margin-top: 10px;
            padding-top: 15px;
        }

        /* Interaktív Kalkulátor */
        .calculator {
            background-color: var(--bg-light);
            padding: 20px;
            border-radius: 8px;
            margin-top: 15px;
            border: 1px dashed var(--primary);
        }
        .calc-input {
            display: flex;
            gap: 15px;
            margin-bottom: 15px;
            align-items: center;
            flex-wrap: wrap;
        }
        input[type="number"] {
            padding: 8px;
            border: 1px solid var(--secondary);
            border-radius: 4px;
            width: 100px;
            font-family: inherit;
        }
        button {
            background-color: var(--primary);
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 4px;
            cursor: pointer;
            font-weight: 600;
            transition: background 0.2s;
        }
        button:hover {
            background-color: var(--primary-hover);
        }
        #calc-result {
            font-weight: bold;
            color: var(--danger);
            font-size: 1.2rem;
        }

        @media (max-width: 600px) {
            .person-card {
                flex-direction: column;
            }
            .person-img-container {
                height: 200px;
                flex: none;
            }
        }