/* CSS Global Otimizado - Calculadora Fácil */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --bg-light: #f8f9fa;
    --text-dark: #343a40;
    --radius: 8px;
    --shadow: 0 4px 6px rgba(0,0,0,0.1);
}

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

.container-calculadora {
    max-width: 800px;
    margin: 40px auto;
    padding: 20px;
}

.calculadora-box, .seo-content {
    background: #ffffff;
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

h1, h2, h3 {
    color: var(--text-dark);
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

.input-group input, .input-group select {
    width: 100%;
    padding: 12px;
    border: 1px solid #ced4da;
    border-radius: 4px;
    box-sizing: border-box;
}

.btn-calcular {
    width: 100%;
    padding: 14px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-calcular:hover {
    background-color: #0056b3;
}

.resultado-box {
    margin-top: 25px;
    padding: 20px;
    background-color: #e2f0d9;
    border-left: 5px solid var(--success-color);
    border-radius: 4px;
}

/* ---------- Estrutura comum ---------- */
*, *::before, *::after { box-sizing: border-box; }
img { max-width: 100%; height: auto; }
a { color: var(--primary-color); }
.skip-link { position: absolute; left: -999px; top: 0; background: #fff; padding: 8px 12px; z-index: 100; }
.skip-link:focus { left: 8px; top: 8px; }

.site-header { background: #fff; box-shadow: var(--shadow); position: relative; z-index: 50; }
.site-footer { background: #212529; color: #ced4da; margin-top: 40px; padding: 30px 20px; font-size: 14px; }
.site-footer a { color: #fff; }
.footer-inner { max-width: 1000px; margin: 0 auto; }
.footer-links { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 8px 20px; }
.copy { opacity: .8; }

.container-calculadora { max-width: 800px; margin: 30px auto; padding: 0 20px; }
.breadcrumb { font-size: 14px; margin-bottom: 14px; color: var(--secondary-color); }
.hint { display: block; margin-top: 6px; color: var(--secondary-color); font-size: 13px; }
.input-group input:focus, .input-group select:focus { outline: 2px solid var(--primary-color); outline-offset: 1px; }
.input-group input[aria-invalid="true"] { border-color: #dc3545; }

.resultado-box[hidden], .erro-box[hidden] { display: none; }
.resultado-box table { width: 100%; border-collapse: collapse; }
.resultado-box td { padding: 8px 4px; border-bottom: 1px solid rgba(0,0,0,.08); }
.resultado-box td:last-child { text-align: right; white-space: nowrap; }
.resultado-box tr.destaque td { font-weight: 700; font-size: 1.1em; }
.resultado-box tr.desconto td:last-child { color: #b02a37; }
.resultado-box tr.secao td { padding-top: 16px; font-weight: 700; border-bottom: 2px solid rgba(0,0,0,.15); }
.resultado-box .nota { margin: 12px 0 0; font-size: 13px; color: #495057; }
.erro-box { margin-top: 20px; padding: 14px 18px; background: #f8d7da; border-left: 5px solid #dc3545; border-radius: 4px; color: #721c24; }
.aviso { margin-top: 24px; font-size: 13px; color: var(--secondary-color); }

.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
.card { display: flex; flex-direction: column; gap: 6px; padding: 16px; border: 1px solid #dee2e6; border-radius: var(--radius); text-decoration: none; color: var(--text-dark); background: #fff; transition: box-shadow .2s, transform .2s; }
.card:hover, .card:focus-visible { box-shadow: var(--shadow); transform: translateY(-2px); }
.card span { font-size: 13px; color: var(--secondary-color); }
.lista-links { padding-left: 20px; }
.hero { text-align: center; }
.hero h1 { font-size: 2rem; margin-top: 0; }

@media (max-width: 600px) {
    .container-calculadora { margin: 16px auto; padding: 0 12px; }
    .calculadora-box, .seo-content { padding: 20px; }
    .hero h1 { font-size: 1.5rem; }
}