:root {
    --bg: #f7f9fc;
    --surface: #ffffff;
    --text: #10213b;
    --muted: #4f5f78;
    --line: #dbe3ee;
    --primary: #1565d8;
    --primary-strong: #0d4ca6;
    --radius: 10px;
    --space-1: 0.5rem;
    --space-2: 0.75rem;
    --space-3: 1rem;
    --space-4: 1.5rem;
    --space-5: 2rem;
    --space-6: 3rem;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
}

a {
    color: var(--primary);
}

a:hover,
a:focus-visible {
    color: var(--primary-strong);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 3px solid #8bb7ff;
    outline-offset: 2px;
}

.container {
    width: min(1100px, calc(100% - 2rem));
    margin: 0 auto;
}

.narrow {
    width: min(760px, calc(100% - 2rem));
}

.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
}

.skip-link:focus {
    left: 1rem;
    top: 1rem;
    z-index: 999;
    background: #fff;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--line);
    border-radius: 8px;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 30;
    background: rgba(255, 255, 255, 0.95);
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
    border-bottom: 1px solid var(--line);
}

.header-inner {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    min-height: 72px;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    color: var(--text);
    text-decoration: none;
    font-weight: 700;
    margin-right: auto;
}

.logo-mark {
    display: inline-grid;
    place-items: center;
    width: 34px;
    height: 34px;
    border-radius: 8px;
    background: #eaf2ff;
    color: var(--primary-strong);
    font-size: 0.85rem;
}

.main-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 0.9rem;
}

.main-nav a {
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
}

.main-nav a[aria-current="page"] {
    color: var(--primary-strong);
}

.nav-toggle {
    display: none;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    border-radius: 10px;
    padding: 0.68rem 1rem;
    text-decoration: none;
    border: 1px solid transparent;
    cursor: pointer;
    font: inherit;
    font-weight: 600;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover,
.btn-primary:focus-visible {
    background: var(--primary-strong);
    color: #fff;
}

.btn-ghost {
    background: transparent;
    border-color: var(--line);
    color: var(--text);
}

.main-content {
    padding-bottom: var(--space-6);
}

.hero,
.section {
    padding: var(--space-6) 0;
}

.section-alt {
    background: #edf3fb;
}

.hero-grid,
.split {
    display: grid;
    gap: var(--space-5);
}

.hero h1,
h1 {
    margin: 0 0 var(--space-3);
    line-height: 1.2;
    font-size: clamp(1.8rem, 2.8vw, 2.7rem);
}

h2 {
    line-height: 1.25;
    font-size: clamp(1.35rem, 2.3vw, 1.9rem);
    margin: 0 0 var(--space-3);
}

.lead {
    color: var(--muted);
    font-size: 1.05rem;
}

.hero-actions,
.cta-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-top: var(--space-4);
}

.trust-box,
.card,
.cta-box,
.related-links,
.simple-form,
.faq-lite,
.article-content,
.contact-cards article {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: var(--space-4);
}

.card-grid,
.contact-cards {
    display: grid;
    gap: var(--space-3);
}

.steps {
    margin: 0;
    padding-left: 1.1rem;
}

.breadcrumbs {
    padding-top: var(--space-4);
}

.breadcrumbs ol {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    list-style: none;
    margin: 0;
    padding: 0;
    font-size: 0.95rem;
}

.breadcrumbs li:not(:last-child)::after {
    content: ">";
    margin-left: 0.35rem;
    color: #7e8ca2;
}

.article-hero {
    padding: var(--space-5) 0 var(--space-3);
}

.article-content {
    display: grid;
    gap: var(--space-4);
}

.prose {
    line-height: 1.72;
    font-size: 1.03rem;
}

.prose h2 {
    margin-top: 1.35rem;
}

.prose p {
    color: #1d2e4a;
}

.prose ul {
    padding-left: 1.2rem;
}

.prose li + li {
    margin-top: 0.4rem;
}

.article-section p,
.article-section ul {
    margin: 0.5rem 0 0;
}

.info-box {
    margin-top: 0.9rem;
    border-left: 4px solid var(--primary);
    background: #eef4ff;
    border-radius: 10px;
    padding: 0.8rem 0.9rem;
    color: #16325f;
}

.simple-form {
    display: grid;
    gap: 0.75rem;
    margin-top: var(--space-4);
}

.simple-form input,
.simple-form textarea {
    width: 100%;
    padding: 0.65rem 0.75rem;
    border-radius: 10px;
    border: 1px solid #c8d4e5;
    font: inherit;
}

.form-note {
    margin: 0;
    font-size: 0.95rem;
    color: #385072;
}

.checkbox-row {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    font-size: 0.95rem;
}

.contact-inline-cta {
    margin-top: var(--space-4);
    background: #eef4ff;
    border: 1px solid #cfe0ff;
    border-radius: var(--radius);
    padding: var(--space-4);
}

.contact-page-stack > .card,
.contact-page-stack > .info-box {
    margin-top: var(--space-5);
}

.calc-highlight {
    background: linear-gradient(135deg, #0d4ca6 0%, #1565d8 100%);
    color: #fff;
    border-radius: var(--radius);
    padding: var(--space-5);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 14px 28px rgba(13, 76, 166, 0.18);
}

.calc-highlight h2,
.calc-highlight p {
    color: #fff;
}

.calc-highlight__badge {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    background: rgba(255, 255, 255, 0.18);
    border: 1px solid rgba(255, 255, 255, 0.35);
    border-radius: 999px;
    padding: 0.2rem 0.6rem;
    margin: 0 0 0.8rem;
}

.calc-highlight .btn-primary {
    background: #fff;
    color: #0d4ca6;
}

.calc-highlight .btn-primary:hover,
.calc-highlight .btn-primary:focus-visible {
    background: #e8f1ff;
    color: #0b3f88;
}

.calculator-layout {
    display: grid;
    gap: var(--space-4);
    margin-top: var(--space-4);
}

.calculator-form {
    margin-top: 0;
}

.range-field {
    display: grid;
    gap: 0.5rem;
}

.range-field input[type="range"] {
    width: 100%;
    accent-color: var(--primary);
}

.calculator-results {
    align-self: start;
}

.result-grid {
    display: grid;
    gap: 0.8rem;
    margin: 0;
}

.result-grid div {
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 0.7rem 0.8rem;
    background: #fbfdff;
}

.result-grid dt {
    font-size: 0.9rem;
    color: var(--muted);
}

.result-grid dd {
    margin: 0.25rem 0 0;
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--text);
}

.site-footer {
    background: #0f1f36;
    color: #f0f5ff;
    padding-top: var(--space-6);
}

.site-footer a {
    color: #d3e3ff;
}

.footer-grid {
    display: grid;
    gap: var(--space-4);
}

.footer-title {
    margin: 0 0 0.6rem;
    font-size: 1.05rem;
}

.footer-text {
    margin: 0;
    color: #d3dff2;
}

.footer-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 0.35rem;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.18);
    margin-top: var(--space-5);
    padding: 1rem 0 1.2rem;
    font-size: 0.93rem;
    color: #d3dff2;
}

@media (min-width: 900px) {
    .hero-grid {
        grid-template-columns: 1.25fr 0.85fr;
    }

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

    .card-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .contact-cards {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .footer-grid {
        grid-template-columns: 1.2fr 1fr 1fr;
    }

    .calculator-layout {
        grid-template-columns: 1fr 0.9fr;
        align-items: start;
    }
}

@media (max-width: 860px) {
    .nav-toggle {
        display: inline-flex;
        border: 1px solid var(--line);
        background: #fff;
        color: var(--text);
        border-radius: 10px;
        padding: 0.45rem 0.7rem;
    }

    .main-nav {
        display: none;
        position: absolute;
        left: 0;
        right: 0;
        top: 72px;
        background: #fff;
        border-bottom: 1px solid var(--line);
        padding: 0.9rem 1rem;
    }

    .main-nav.is-open {
        display: block;
    }

    .main-nav ul {
        flex-direction: column;
        gap: 0.5rem;
    }

    .header-cta {
        display: none;
    }
}