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

body {
    font-family: 'Inter', sans-serif;
    background-color: #F4F6F8;
    color: #1E3A5F;
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

.header {
    background: #1E3A5F;
    color: white;
    padding: 20px 0;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 22px;
    font-weight: 600;
    margin: 0;
}

nav {
    display: flex;
    gap: 30px;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s;
}

nav a:hover {
    opacity: 0.8;
}

.hero {
    padding: 80px 20px;
    text-align: center;
    background: linear-gradient(135deg, #F4F6F8 0%, #E8ECEF 100%);
}

.hero h2 {
    font-size: 42px;
    margin-bottom: 20px;
    color: #1E3A5F;
}

.hero p {
    font-size: 18px;
    max-width: 700px;
    margin: 0 auto 30px;
    color: #555;
}

.btn-primary {
    background: #2E7D32;
    color: white;
    padding: 14px 32px;
    border-radius: 8px;
    text-decoration: none;
    display: inline-block;
    font-weight: 600;
    transition: background 0.3s;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

.btn-primary:hover {
    background: #27632a;
}

.btn-secondary {
    background: #1E3A5F;
    color: white;
    padding: 10px 20px;
    border-radius: 6px;
    text-decoration: none;
    display: inline-block;
    font-weight: 500;
    margin-top: 15px;
    transition: background 0.3s;
}

.btn-secondary:hover {
    background: #153050;
}

.calculator {
    padding: 60px 20px;
    background: #FFFFFF;
}

.calculator .container {
    max-width: 600px;
}

.calculator h3 {
    font-size: 22px;
    color: #1E3A5F;
    margin-bottom: 40px;
    text-align: left;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: #1E3A5F;
    font-size: 15px;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 1px solid #CCC;
    border-radius: 6px;
    font-size: 16px;
    font-family: 'Inter', sans-serif;
    box-sizing: border-box;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #2E7D32;
    box-shadow: 0 0 5px rgba(46, 125, 50, 0.3);
}

.select-input {
    width: 100%;
    padding: 12px;
    border: 1px solid #CCC;
    border-radius: 6px;
    font-size: 16px;
    font-family: 'Inter', sans-serif;
    background-color: white;
    cursor: pointer;
    box-sizing: border-box;
}

.select-input:focus {
    outline: none;
    border-color: #2E7D32;
    box-shadow: 0 0 5px rgba(46, 125, 50, 0.3);
}

.calculator button {
    margin-top: 20px;
    width: 100%;
    border: none;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
}

#resultado {
    margin-top: 50px;
    padding: 25px;
    background: #F4F6F8;
    border-radius: 8px;
    border-left: 4px solid #2E7D32;
}

#resultado h3 {
    font-size: 18px;
    margin-top: 0;80px, 1fr));
    gap: 25px;
    margin-top: 40px;
}

.card {
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.card h3 {
    margin-top: 0;
    margin-bottom: 15px;
    color: #1E3A5F;
    font-size: 20px;
}

.card p {
    color: #666;
    margin-bottom: 15px;
}

.ad-space {
    background: #E0E0E0;
    padding: 40px;
    text-align: center;
    border-radius: 8px;
    margin: 50px 0;
    color: #999;
    font-size: 14px;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.about {
    padding: 80px 20px;
}

.about h2 {
    font-size: 32px;
    margin-bottom: 30px;
    color: #1E3A5F;
}

.about p {
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 20px;
    color: #555;
}

.about ul {
    margin: 20px 0;
    padding-left: 30px;
}

.about li {
    margin: 12px 0;
    line-height: 1.8;
    color: #555;
}

.about h3 {
    margin-top: 30px;
    margin-bottom: 15px;
    color: #1E3A5F;
    font-size: 20px;
}

.calculators {
    padding: 80px 20px;
}

.calculators h2 {
    font-size: 32px;
    text-align: center;
    margin-bottom: 50px;
    color: #1E3A5F;
}

.footer {
    background: #1E3A5F;
    color: white;
    text-align: center;
    padding: 40px 20px;
    margin-top: 80px;
}

.footer-links {
    margin-top: 15px;
}

.footer-links a {
    color: #ffffff;
    text-decoration: none;
    margin: 0 10px;
    transition: opacity 0.3s;
}

.footer-links a:hover {
    opacity: 0.8;
}

.footer p {
    margin-bottom: 15px;
}

/* ========================================
   MEDIA QUERIES - TABLET (769px - 1024px)
   ======================================== */

@media (max-width: 1024px) {
    .container {
        width: 95%;
        padding: 0 15px;
    }

    .hero h2 {
        font-size: 36px;
    }

    .hero p {
        font-size: 16px;
    }

    .about h2,
    .calculators h2 {
        font-size: 28px;
    }

    nav {
        gap: 20px;
    }

    nav a {
        font-size: 15px;
    }
}

/* ========================================
   MEDIA QUERIES - MOBILE (320px - 768px)
   ======================================== */

@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        text-align: center;
        gap: 15px;
    }

    nav {
        flex-direction: column;
        gap: 10px;
        width: 100%;
    }

    nav a {
        display: block;
        padding: 8px 0;
        font-size: 14px;
    }

    .logo {
        font-size: 20px;
    }

    .hero {
        padding: 50px 15px;
    }

    .hero h2 {
        font-size: 28px;
        margin-bottom: 15px;
    }

    .hero p {
        font-size: 15px;
        margin-bottom: 20px;
    }

    .btn-primary {
        padding: 12px 24px;
        font-size: 15px;
    }

    .calculator {
        padding: 40px 15px;
    }

    .calculator .container {
        max-width: 100%;
    }

    .calculator h3 {
        font-size: 18px;
        margin-bottom: 25px;
    }

    .form-group {
        margin-bottom: 18px;
    }

    .form-group label {
        font-size: 14px;
        margin-bottom: 8px;
    }

    .form-group input,
    .form-group select,
    .select-input {
        padding: 11px;
        font-size: 15px;
    }

    .calculator button {
        margin-top: 15px;
        padding: 12px 20px;
        font-size: 15px;
    }

    #resultado {
        margin-top: 30px;
        padding: 18px;
    }

    #resultado h3 {
        font-size: 16px;
        margin-bottom: 15px;
    }

    #resultado p {
        font-size: 15px;
        margin: 8px 0;
    }

    .card-grid {
        grid-template-columns: 1fr;
        gap: 15px;
        margin-top: 30px;
    }

    .card {
        padding: 20px;
    }

    .card h3 {
        font-size: 18px;
    }

    .card p {
        font-size: 14px;
    }

    .ad-space {
        padding: 30px 15px;
        margin: 30px 0;
        min-height: 80px;
        font-size: 13px;
    }

    .about {
        padding: 50px 15px;
    }

    .about h2 {
        font-size: 24px;
        margin-bottom: 20px;
    }

    .about p {
        font-size: 15px;
        margin-bottom: 15px;
    }

    .about h3 {
        font-size: 18px;
        margin-top: 20px;
        margin-bottom: 12px;
    }

    .about ul {
        padding-left: 20px;
    }

    .about li {
        margin: 8px 0;
        font-size: 15px;
    }

    .calculators {
        padding: 50px 15px;
    }

    .calculators h2 {
        font-size: 24px;
        margin-bottom: 30px;
    }

    .footer {
        padding: 30px 15px;
        margin-top: 50px;
    }

    .footer p {
        font-size: 14px;
        margin-bottom: 10px;
    }

    .footer-links a {
        margin: 0 5px;
        font-size: 13px;
    }
}

/* ========================================
   MEDIA QUERIES - TELEFONE PEQUENO (320px - 480px)
   ======================================== */

@media (max-width: 480px) {
    .header .container {
        gap: 10px;
    }

    nav {
        gap: 8px;
    }

    nav a {
        font-size: 13px;
    }

    .hero h2 {
        font-size: 22px;
        margin-bottom: 12px;
    }

    .hero p {
        font-size: 14px;
        margin-bottom: 15px;
    }

    .btn-primary {
        padding: 10px 20px;
        font-size: 14px;
    }

    .calculator h3 {
        font-size: 16px;
        margin-bottom: 20px;
    }

    .form-group label {
        font-size: 13px;
    }

    .form-group input,
    .form-group select,
    .select-input {
        padding: 10px;
        font-size: 14px;
    }

    .calculator button {
        padding: 10px 15px;
        font-size: 14px;
    }

    #resultado {
        padding: 15px;
    }

    #resultado h3 {
        font-size: 15px;
    }

    #resultado p {
        font-size: 14px;
        margin: 6px 0;
    }

    .card-grid {
        gap: 12px;
        margin-top: 20px;
    }

    .card {
        padding: 15px;
    }

    .card h3 {
        font-size: 16px;
        margin-bottom: 10px;
    }

    .ad-space {
        padding: 20px 10px;
        margin: 20px 0;
    }

    .about h2,
    .calculators h2 {
        font-size: 20px;
    }
    color: white;
    text-align: center;
    padding: 20px 0;
    margin-top: 40px;
}

.footer-links a {
    color: #ffffff;
    text-decoration: none;
}

.footer-links a:hover {
    text-decoration: underline;
}