:root {
    --primary: #4CAF50;
    --bg: #1e1e1e;
    --text: #ffffff;
    --card: #2d2d2d;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    padding: 20px;
    text-align: center;
}

.container {
    max-width: 500px;
    margin: 0 auto;
}

.letra-destaque {
    font-size: 120px;
    font-weight: bold;
    color: var(--primary);
    background: var(--card);
    width: 200px;
    height: 200px;
    line-height: 200px;
    border-radius: 20px;
    margin: 20px auto;
    box-shadow: 0 4px 10px rgba(0,0,0,0.5);
}

button {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 20px;
    font-weight: bold;
    border-radius: 10px;
    cursor: pointer;
    width: 100%;
    margin-bottom: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
}

button:active {
    transform: scale(0.98);
}

.btn-secundario {
    background-color: #f44336;
    font-size: 16px;
    padding: 10px 20px;
}

.secao {
    background: var(--card);
    padding: 15px;
    border-radius: 10px;
    margin-top: 20px;
    text-align: left;
}

.secao h3 {
    margin-top: 0;
    border-bottom: 2px solid var(--primary);
    padding-bottom: 5px;
}

.dica {
    font-size: 12px;
    color: #aaa;
}

.historico-container {
    font-size: 18px;
    letter-spacing: 2px;
    word-wrap: break-word;
}

.filtros-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-top: 15px;
}

.filtro-item {
    display: flex;
    align-items: center;
    background: #444;
    padding: 5px 10px;
    border-radius: 5px;
}

.filtro-item input {
    margin-right: 5px;
    transform: scale(1.3);
}