:root {
    --renk-alkali: #ff6b6b;        
    --renk-toprakalkali: #feca57;  
    --renk-gecis: #ff9ff3;         
    --renk-metal: #54a0ff;       
    --renk-yarimetal: #00d2d3;     
    --renk-ametal: #1dd1a1;    
    --renk-halojen: #5f27cd;       
    --renk-soygaz: #48dbfb;        
    --renk-lantanit: #ff9f43;      
    --renk-aktinit: #8395a7;       
    --koyu-arkaplan: #222f3e;
    --yazi-renk: #c8d6e5;
}


.gruplar-container {
    padding: 40px;
    max-width: 1200px;
    margin: 0 auto;
}


.grup-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}


.grup-kart {
    background-color: #1e272e;
    border-radius: 15px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    position: relative;
    border: 1px solid rgba(255,255,255,0.05);
}

.grup-kart:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.4);
}

.kart-header {
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.kart-ikon {
    font-size: 3rem;
    color: rgba(255,255,255,0.9);
    z-index: 2;
}


.kart-body {
    padding: 25px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.kart-baslik {
    font-size: 1.5rem;
    margin: 0 0 10px 0;
    color: #fff;
    font-weight: bold;
}

.kart-ozet {
    font-size: 0.95rem;
    color: #bdc3c7;
    line-height: 1.5;
    margin-bottom: 20px;
    flex-grow: 1;
}

.kart-link {
    font-weight: bold;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: margin-left 0.2s;
}

.grup-kart:hover .kart-link {
    margin-left: 5px;
}


.alkali .kart-header { background: linear-gradient(45deg, var(--renk-alkali), #b33939); }
.alkali .kart-link { color: var(--renk-alkali); }


.toprak-alkali .kart-header { background: linear-gradient(45deg, var(--renk-toprakalkali), #e1b12c); }
.toprak-alkali .kart-link { color: var(--renk-toprakalkali); }


.gecis .kart-header { background: linear-gradient(45deg, var(--renk-gecis), #cd84f1); }
.gecis .kart-link { color: var(--renk-gecis); }


.metal .kart-header { background: linear-gradient(45deg, var(--renk-metal), #2e86de); }
.metal .kart-link { color: var(--renk-metal); }


.yarimetal .kart-header { background: linear-gradient(45deg, var(--renk-yarimetal), #0fb9b1); }
.yarimetal .kart-link { color: var(--renk-yarimetal); }


.ametal .kart-header { background: linear-gradient(45deg, var(--renk-ametal), #20bf6b); }
.ametal .kart-link { color: var(--renk-ametal); }


.halojen .kart-header { background: linear-gradient(45deg, var(--renk-halojen), #341f97); }
.halojen .kart-link { color: var(--renk-halojen); }


.soygaz .kart-header { background: linear-gradient(45deg, var(--renk-soygaz), #0abde3); }
.soygaz .kart-link { color: var(--renk-soygaz); }


.lantanit .kart-header { background: linear-gradient(45deg, var(--renk-lantanit), #e67e22); }
.lantanit .kart-link { color: var(--renk-lantanit); }


.aktinit .kart-header { background: linear-gradient(45deg, var(--renk-aktinit), #576574); }
.aktinit .kart-link { color: var(--renk-aktinit); }



.ozellik-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.ozellik-kutu {
    background: #fff;
    padding: 20px;
    border-radius: 10px;
    border-left: 5px solid var(--ana-renk); 
    box-shadow: 0 4px 6px rgba(0,0,0,0.08);
}

.ozellik-kutu h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.ozellik-kutu p {
    font-size: 0.95rem;
    color: #2d3436;
    line-height: 1.6;
    font-weight: 500;
}


.bilgi-paneli {
    background-color: white;
    padding: 30px;
    border-radius: 15px;
    margin-bottom: 40px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.bilgi-paneli h2 {
    font-size: 1.8rem;
    color: var(--sidebar-bg);
    margin-bottom: 20px;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
}

.bilgi-paneli p {
    margin-bottom: 15px;
    line-height: 1.7;
    color: #2c3e50;
    font-size: 1rem;
    font-weight: 500;
}


.trend-tablosu {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin-top: 20px;
    font-size: 1rem;
    border: 1px solid #dfe6e9;
    border-radius: 8px;
}

.trend-tablosu th {
    padding: 15px;
    background-color: #dfe6e9;
    color: #2d3436;
    font-weight: bold;
}

.trend-tablosu td {
    padding: 15px 70px;
    border-bottom: 1px solid #dfe6e9;
    color: #2d3436;
    font-weight: 500;
}

.trend-tablosu tr:hover {
    background-color: #f1f2f6;
}


.kullanim-listesi {
    list-style: none;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 15px;
}

.kullanim-listesi li {
    background: #f1f2f6;
    padding: 15px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 15px;
    color: #2d3436;
    font-weight: 600;
}

.kullanim-listesi li i {
    font-size: 1.2rem;
    color: var(--sidebar-bg);
}