:root {
    --paper: #f7fbff;
    --surface: #ffffff;
    --ink: #244363;
    --muted: #58718a;
    --line: #bfd4e5;
    --accent: #b53f4f;
    --accent-soft: #f8e9ed;
    --teal: #1f7a78;
    --blue-soft: #eaf4fb;
    --focus: #d05a2b;
}

* {
    box-sizing: border-box;
}

html {
    background: var(--paper);
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-width: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.72;
}

body::before {
    content: "";
    display: block;
    height: 5px;
    background: linear-gradient(90deg, var(--accent) 0 38%, var(--teal) 38% 72%, #5a7fb0 72% 100%);
}

a {
    color: #245f87;
    text-underline-offset: 0.18em;
    text-decoration-thickness: 1px;
}

a:hover {
    color: var(--accent);
}

a:active {
    color: #8d2f3c;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 3px solid var(--focus);
    outline-offset: 3px;
}

.site-header {
    background: var(--surface);
    border-bottom: 1px solid var(--line);
}

.header-inner,
.hero-inner,
main > .content-section,
main > .topic-grid,
main > .field-note,
.footer-inner {
    width: min(1160px, calc(100% - 40px));
    margin-inline: auto;
}

.header-inner {
    display: grid;
    grid-template-columns: minmax(280px, 1fr) minmax(0, 2fr);
    align-items: center;
    gap: 28px;
    padding: 18px 0;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    color: var(--ink);
    font-weight: 760;
    text-decoration: none;
}

.brand-mark {
    display: grid;
    width: 58px;
    height: 42px;
    place-items: center;
    border: 2px solid var(--accent);
    color: var(--accent);
    font-size: 14px;
    letter-spacing: 0.12em;
}

.brand-name {
    max-width: 360px;
    line-height: 1.25;
}

.main-nav {
    display: flex;
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: 6px 14px;
}

.main-nav a {
    padding: 6px 0;
    color: var(--ink);
    font-size: 14px;
    font-weight: 690;
    text-decoration: none;
    border-bottom: 2px solid transparent;
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.hero {
    position: relative;
    overflow: hidden;
    background: var(--blue-soft);
    border-bottom: 1px solid var(--line);
}

.hero::after {
    content: "";
    position: absolute;
    right: -90px;
    bottom: -150px;
    width: 360px;
    height: 360px;
    border: 36px solid rgba(31, 122, 120, 0.12);
    transform: rotate(18deg);
}

.hero-inner {
    position: relative;
    z-index: 1;
    padding: 76px 0 66px;
}

.eyebrow {
    margin: 0 0 14px;
    color: var(--teal);
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

h1,
h2,
h3,
p {
    overflow-wrap: anywhere;
}

h1 {
    max-width: 880px;
    margin: 0;
    color: var(--ink);
    font-size: 40px;
    line-height: 1.12;
    letter-spacing: -0.025em;
}

h2 {
    margin: 0 0 18px;
    color: var(--ink);
    font-size: 28px;
    line-height: 1.22;
    letter-spacing: -0.015em;
}

h3 {
    margin: 28px 0 10px;
    color: var(--ink);
    font-size: 21px;
    line-height: 1.3;
}

p {
    margin: 0 0 18px;
    font-size: 16px;
}

.lead {
    max-width: 780px;
    margin: 24px 0 0;
    color: #3f627d;
    font-size: 19px;
    line-height: 1.62;
}

main > .content-section {
    padding: 58px 0 18px;
    max-width: 860px;
}

main > .content-section + .content-section {
    padding-top: 36px;
}

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

.topic-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0;
    padding: 58px 0 22px;
    border-bottom: 1px solid var(--line);
}

.topic-card {
    padding: 28px 30px 30px;
    border-top: 1px solid var(--line);
}

.topic-card:nth-child(odd) {
    border-right: 1px solid var(--line);
}

.topic-card h2 {
    margin-bottom: 12px;
    font-size: 28px;
}

.topic-card h2 a {
    color: var(--ink);
    text-decoration: none;
}

.topic-card h2 a:hover {
    color: var(--accent);
}

.topic-card p {
    color: var(--muted);
}

.field-note {
    margin-top: 42px;
    margin-bottom: 66px;
    padding: 24px 28px;
    background: var(--accent-soft);
    border-left: 5px solid var(--accent);
}

.field-note p {
    margin: 0;
    font-weight: 640;
}

.site-footer {
    margin-top: 70px;
    background: #dfeef7;
    border-top: 1px solid var(--line);
}

.footer-inner {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 36px;
    padding: 34px 0;
}

.footer-inner p {
    margin: 0;
    color: #40627b;
    font-size: 14px;
}

.footer-inner a {
    color: var(--ink);
    font-weight: 760;
}

@media (max-width: 900px) {
    .header-inner {
        grid-template-columns: 1fr;
        align-items: start;
    }

    .main-nav {
        justify-content: flex-start;
    }

    .hero-inner {
        padding: 58px 0 52px;
    }

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

    .topic-card:nth-child(odd) {
        border-right: 0;
    }
}

@media (max-width: 620px) {
    .header-inner,
    .hero-inner,
    main > .content-section,
    main > .topic-grid,
    main > .field-note,
    .footer-inner {
        width: min(100% - 28px, 1160px);
    }

    .brand {
        align-items: flex-start;
    }

    .brand-name {
        font-size: 14px;
    }

    .main-nav {
        gap: 4px 16px;
    }

    .main-nav a {
        padding: 8px 0;
    }

    .hero-inner {
        padding: 46px 0 42px;
    }

    h1 {
        font-size: 40px;
    }

    .lead {
        font-size: 17px;
    }

    main > .content-section {
        padding-top: 44px;
    }

    .topic-card {
        padding: 24px 0;
    }

    .footer-inner {
        grid-template-columns: 1fr;
        gap: 14px;
    }
}