:root {
    --bg: #f5f7fb;
    --surface: #ffffff;
    --text: #172033;
    --muted: #64748b;
    --primary: #1d4ed8;
    --primary-dark: #1e40af;
    --border: #e2e8f0;
    --success-bg: #ecfdf5;
    --success-text: #047857;
    --danger-bg: #fef2f2;
    --danger-text: #b91c1c;
    --danger-border: #fecaca;
    --shadow: 0 12px 30px rgba(15, 23, 42, 0.06);
    --shadow-hover: 0 18px 40px rgba(15, 23, 42, 0.10);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: var(--bg);
    color: var(--text);
}

a {
    color: inherit;
    text-decoration: none;
}

.container {
    width: min(1120px, 92%);
    margin: 0 auto;
}

/* Header */

.site-header {
    background: rgba(255, 255, 255, 0.92);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
    backdrop-filter: blur(10px);
}

.header-content {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.logo {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--primary);
}

.main-nav {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.main-nav a {
    color: var(--muted);
    font-weight: 600;
    font-size: 0.95rem;
}

.main-nav a:hover {
    color: var(--primary);
}

/* Home */

.hero {
    padding: 72px 0;
    background: linear-gradient(135deg, #eff6ff, #ffffff);
    border-bottom: 1px solid var(--border);
}

.hero h1 {
    max-width: 820px;
    font-size: clamp(2rem, 5vw, 3.8rem);
    line-height: 1.05;
    margin: 16px 0;
    letter-spacing: -0.04em;
}

.hero p {
    max-width: 760px;
    color: var(--muted);
    font-size: 1.15rem;
    line-height: 1.7;
}

.section {
    padding: 48px 0;
}

.section h2 {
    font-size: 1.8rem;
    margin-top: 0;
}

.badge {
    display: inline-flex;
    background: var(--success-bg);
    color: var(--success-text);
    padding: 8px 12px;
    border-radius: 999px;
    font-weight: 700;
    font-size: 0.85rem;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
    margin-top: 24px;
}

.card {
    display: block;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 24px;
    box-shadow: var(--shadow);
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(29, 78, 216, 0.25);
}

.card h3 {
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 1.15rem;
}

.card p {
    color: var(--muted);
    line-height: 1.6;
}

.card span {
    color: var(--primary);
    font-weight: 700;
}

/* Page header */

.page-header {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 22px;
    padding: 32px;
    box-shadow: var(--shadow);
}

.page-header h1 {
    margin: 16px 0 8px;
    font-size: clamp(2rem, 4vw, 3rem);
    letter-spacing: -0.03em;
}

.page-header p {
    color: var(--muted);
    line-height: 1.7;
    max-width: 850px;
}

/* Calculator layout */

.calculator-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-top: 24px;
    align-items: start;
}

.form-card,
.result-card,
.info-box {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 24px;
    box-shadow: var(--shadow);
}

.form-card h2,
.result-card h2,
.info-box h2 {
    margin-top: 0;
}

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

.form-group label {
    display: block;
    font-weight: 700;
    margin-bottom: 8px;
}

.form-group input {
    width: 100%;
    min-height: 46px;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0 14px;
    font-size: 1rem;
    color: var(--text);
    background: #ffffff;
}

.form-group input:focus {
    outline: 2px solid rgba(29, 78, 216, 0.18);
    border-color: var(--primary);
}

.form-group small {
    display: block;
    margin-top: 6px;
    color: var(--muted);
    font-size: 0.85rem;
}

.checkbox-group {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    margin: 20px 0;
    color: var(--muted);
    line-height: 1.5;
}

.checkbox-group input {
    margin-top: 4px;
}

.button-primary {
    width: 100%;
    min-height: 48px;
    border: none;
    border-radius: 14px;
    background: var(--primary);
    color: #ffffff;
    font-size: 1rem;
    font-weight: 800;
    cursor: pointer;
    transition: background 0.15s ease, transform 0.15s ease;
}

.button-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.error-alert {
    background: var(--danger-bg);
    color: var(--danger-text);
    border: 1px solid var(--danger-border);
    border-radius: 12px;
    padding: 12px;
    margin-bottom: 18px;
    font-weight: 700;
}

/* Results */

.result-line {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

.result-line span {
    color: var(--muted);
}

.result-line strong {
    text-align: right;
}

.result-note {
    background: #eff6ff;
    color: var(--primary);
    border-radius: 12px;
    padding: 10px 12px;
    margin: 8px 0 12px;
    font-size: 0.9rem;
    font-weight: 700;
}

.total-discounts {
    margin-top: 8px;
    font-weight: 800;
}

.result-total {
    margin-top: 18px;
    padding: 18px;
    border-radius: 16px;
    background: var(--success-bg);
    color: var(--success-text);
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: center;
}

.result-total span {
    font-weight: 800;
}

.result-total strong {
    font-size: 1.4rem;
    text-align: right;
}

.empty-result {
    color: var(--muted);
    line-height: 1.7;
}

/* Info */

.info-box {
    margin-top: 24px;
}

.info-box p {
    color: var(--muted);
    line-height: 1.7;
}

/* Footer */

.site-footer {
    margin-top: 48px;
    background: #0f172a;
    color: #e2e8f0;
    padding: 32px 0;
}

.site-footer p {
    margin: 0 0 8px;
}

.footer-warning {
    color: #94a3b8;
    font-size: 0.9rem;
    line-height: 1.6;
}

/* Responsive */

@media (max-width: 960px) {
    .cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .calculator-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 680px) {
    .header-content {
        align-items: flex-start;
        flex-direction: column;
        padding: 18px 0;
    }

    .main-nav {
        gap: 10px;
    }

    .cards-grid {
        grid-template-columns: 1fr;
    }

    .hero {
        padding: 48px 0;
    }

    .page-header {
        padding: 24px;
    }

    .result-total {
        flex-direction: column;
        align-items: flex-start;
    }

    .result-total strong {
        text-align: left;
    }
}

.form-group select {
    width: 100%;
    min-height: 46px;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0 14px;
    font-size: 1rem;
    color: var(--text);
    background: #ffffff;
}

.form-group select:focus {
    outline: 2px solid rgba(29, 78, 216, 0.18);
    border-color: var(--primary);
}

.article-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 22px;
    padding: 40px;
    box-shadow: var(--shadow);
    max-width: 900px;
    margin: 0 auto;
}

.article-card h1 {
    font-size: clamp(2rem, 4vw, 3.2rem);
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin: 18px 0;
}

.article-card h2 {
    margin-top: 36px;
    margin-bottom: 12px;
    font-size: 1.6rem;
}

.article-card h3 {
    margin-bottom: 8px;
}

.article-card p,
.article-card li {
    color: var(--muted);
    line-height: 1.8;
    font-size: 1rem;
}

.article-lead {
    font-size: 1.15rem !important;
    color: var(--text) !important;
}

.formula-box {
    background: #eff6ff;
    border: 1px solid rgba(29, 78, 216, 0.18);
    color: var(--primary);
    font-weight: 800;
    border-radius: 16px;
    padding: 18px;
    margin: 18px 0;
}

.article-cta {
    margin: 24px 0;
}

.article-cta.bottom {
    margin-top: 40px;
}

.button-link {
    display: inline-flex;
    width: auto;
    padding: 0 22px;
    align-items: center;
    justify-content: center;
}

.secondary-link {
    display: inline-flex;
    margin-top: 12px;
    color: var(--primary);
    font-weight: 800;
}

.secondary-link:hover {
    color: var(--primary-dark);
}

.faq-list {
    display: grid;
    gap: 14px;
    margin-top: 18px;
}

.faq-item {
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 18px;
    background: #ffffff;
}

.faq-item h3 {
    margin-top: 0;
}

@media (max-width: 680px) {
    .article-card {
        padding: 24px;
    }
}

.table-wrapper {
    overflow-x: auto;
    margin: 18px 0;
}

.content-table {
    width: 100%;
    border-collapse: collapse;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
}

.content-table th,
.content-table td {
    border-bottom: 1px solid var(--border);
    padding: 14px;
    text-align: left;
    color: var(--muted);
}

.content-table th {
    background: #eff6ff;
    color: var(--primary);
    font-weight: 800;
}

.content-table tr:last-child td {
    border-bottom: none;
}

.error-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 48px;
    max-width: 760px;
    margin: 0 auto;
    text-align: center;
    box-shadow: var(--shadow);
}

.error-card h1 {
    font-size: clamp(2rem, 5vw, 3.4rem);
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin: 18px 0;
}

.error-card p {
    color: var(--muted);
    line-height: 1.8;
    font-size: 1.05rem;
    max-width: 580px;
    margin-left: auto;
    margin-right: auto;
}

.error-actions {
    display: flex;
    flex-direction: column;
    gap: 14px;
    align-items: center;
    margin-top: 28px;
}

@media (max-width: 680px) {
    .error-card {
        padding: 28px;
    }
}

.site-footer {
    margin-top: 64px;
    padding: 48px 0 26px;
    background: #0f172a;
    color: #e5e7eb;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 32px;
}

.site-footer h2,
.site-footer h3 {
    color: #ffffff;
    margin-top: 0;
}

.site-footer p {
    color: #cbd5e1;
    line-height: 1.7;
    margin-bottom: 0;
}

.site-footer a {
    display: block;
    color: #cbd5e1;
    text-decoration: none;
    margin: 10px 0;
    font-weight: 600;
}

.site-footer a:hover {
    color: #ffffff;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    margin-top: 34px;
    padding-top: 22px;
}

.footer-bottom p {
    font-size: 0.92rem;
}

@media (max-width: 780px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.96);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(14px);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 68px;
    gap: 20px;
}

.brand {
    color: var(--primary);
    font-weight: 900;
    text-decoration: none;
    font-size: 1.1rem;
    letter-spacing: -0.02em;
}

.menu-dropdown {
    position: relative;
}

.menu-dropdown summary {
    list-style: none;
}

.menu-dropdown summary::-webkit-details-marker {
    display: none;
}

.menu-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-height: 42px;
    padding: 0 16px;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: #ffffff;
    color: var(--text);
    font-weight: 800;
    cursor: pointer;
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.06);
}

.menu-button:hover {
    border-color: rgba(29, 78, 216, 0.35);
    color: var(--primary);
}

.menu-icon {
    font-size: 1.25rem;
    line-height: 1;
}

.menu-panel {
    position: absolute;
    right: 0;
    top: calc(100% + 12px);
    width: min(420px, calc(100vw - 32px));
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
    padding: 20px;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 22px;
    box-shadow: 0 24px 60px rgba(15, 23, 42, 0.16);
}

.menu-group h3 {
    margin: 0 0 12px;
    color: var(--text);
    font-size: 0.95rem;
}

.menu-group a {
    display: block;
    padding: 10px 12px;
    border-radius: 12px;
    color: var(--muted);
    text-decoration: none;
    font-weight: 700;
}

.menu-group a:hover {
    background: #eff6ff;
    color: var(--primary);
}

.site-footer {
    margin-top: 0;
    padding: 48px 0 26px;
    background: #0f172a;
    color: #e5e7eb;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 32px;
}

.site-footer h2,
.site-footer h3 {
    color: #ffffff;
    margin-top: 0;
}

.site-footer p {
    color: #cbd5e1;
    line-height: 1.7;
    margin-bottom: 0;
}

.site-footer a {
    display: block;
    color: #cbd5e1;
    text-decoration: none;
    margin: 10px 0;
    font-weight: 600;
}

.site-footer a:hover {
    color: #ffffff;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    margin-top: 34px;
    padding-top: 22px;
}

.footer-bottom p {
    font-size: 0.92rem;
    margin-bottom: 10px;
}

.footer-bottom p:last-child {
    margin-bottom: 0;
}

@media (max-width: 780px) {
    .header-content {
        min-height: 64px;
    }

    .brand {
        font-size: 1rem;
    }

    .menu-panel {
        grid-template-columns: 1fr;
        right: 0;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* Ajuste visual da página inicial */

.hero {
    background: linear-gradient(135deg, #eff6ff 0%, #ffffff 65%);
    border-bottom: 1px solid var(--border);
    padding: 88px 0;
}

.hero-content {
    max-width: 760px;
}

.hero-content h1 {
    font-size: clamp(2.4rem, 5vw, 4.2rem);
    line-height: 1.05;
    letter-spacing: -0.05em;
    color: var(--text);
    margin: 18px 0 22px;
}

.hero-content p {
    color: var(--muted);
    font-size: 1.1rem;
    line-height: 1.8;
    max-width: 720px;
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-top: 28px;
}

.section-header {
    max-width: 760px;
    margin-bottom: 32px;
}

.section-header h2 {
    font-size: clamp(1.8rem, 3vw, 2.5rem);
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin: 12px 0;
    color: var(--text);
}

.section-header p {
    color: var(--muted);
    line-height: 1.8;
    font-size: 1rem;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
}

.calculator-card {
    display: flex;
    flex-direction: column;
    min-height: 170px;
    padding: 26px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 18px;
    text-decoration: none;
    color: var(--text);
    box-shadow: var(--shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.calculator-card:hover {
    transform: translateY(-4px);
    border-color: rgba(29, 78, 216, 0.35);
    box-shadow: 0 24px 60px rgba(15, 23, 42, 0.12);
}

.calculator-card h3 {
    margin: 0 0 12px;
    font-size: 1.15rem;
    color: var(--text);
}

.calculator-card p {
    color: var(--muted);
    line-height: 1.6;
    margin: 0 0 18px;
}

.calculator-card span {
    margin-top: auto;
    color: var(--primary);
    font-weight: 800;
}

@media (max-width: 920px) {
    .cards-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 620px) {
    .hero {
        padding: 56px 0;
    }

    .cards-grid {
        grid-template-columns: 1fr;
    }

    .calculator-card {
        min-height: auto;
    }
}