:root {
    --epoxy-blue: #0878b9;
    --epoxy-blue-dark: #075d8e;
    --epoxy-red: #a52521;
    --ink: #24272a;
    --muted: #5d656c;
    --line: #d7dde2;
    --panel: #f4f8fb;
    --white: #ffffff;
}

* {
    box-sizing: border-box;
}

html {
    font-family: Arial, Helvetica, sans-serif;
    color: var(--ink);
    background: #eef3f6;
    line-height: 1.55;
}

body {
    margin: 0;
}

a {
    color: var(--epoxy-blue-dark);
}

a:hover,
a:focus {
    color: var(--epoxy-red);
}

.site-header {
    color: var(--white);
    background: linear-gradient(135deg, var(--epoxy-blue-dark), var(--epoxy-blue));
    border-bottom: 4px solid var(--epoxy-red);
}

.site-header__inner,
.site-footer__inner,
.page-shell {
    width: min(1100px, calc(100% - 32px));
    margin-inline: auto;
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 18px 0;
}

.brand {
    display: flex;
    flex-direction: column;
    color: var(--white);
    text-decoration: none;
}

.brand:hover,
.brand:focus {
    color: var(--white);
}

.brand__name {
    font-size: 1.65rem;
    font-weight: 800;
}

.brand__label {
    font-size: 0.9rem;
}

nav {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
}

nav a {
    color: var(--white);
    font-weight: 700;
    text-decoration: none;
}

nav a:hover,
nav a:focus {
    color: #fff0b5;
}

.page-shell {
    min-height: 65vh;
    margin-block: 28px;
    padding: clamp(22px, 4vw, 48px);
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 10px;
    box-shadow: 0 8px 28px rgba(26, 47, 60, 0.08);
}

.technical-article {
    max-width: 900px;
    margin-inline: auto;
}

h1 {
    margin-top: 0;
    color: var(--epoxy-blue-dark);
    font-size: clamp(2rem, 5vw, 3rem);
    line-height: 1.15;
}

h2 {
    margin-top: 1.6em;
    color: var(--epoxy-blue-dark);
}

.callout {
    margin: 24px 0;
    padding: 18px 22px;
    background: var(--panel);
    border-left: 5px solid var(--epoxy-blue);
    border-radius: 4px;
}

.callout h2,
.callout h3 {
    margin-top: 0;
}

.form-section {
    margin: 28px 0;
    padding: 22px;
    border: 1px solid var(--line);
    border-radius: 8px;
}

.form-section h2 {
    margin-top: 0;
}

input[type="text"],
input[type="email"],
input[type="tel"],
select,
textarea {
    width: min(100%, 720px);
    margin-top: 5px;
    padding: 11px 12px;
    color: var(--ink);
    background: var(--white);
    border: 1px solid #9da9b1;
    border-radius: 4px;
    font: inherit;
}

textarea {
    resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--epoxy-blue);
    outline: 3px solid rgba(8, 120, 185, 0.18);
}

button {
    padding: 12px 22px;
    color: var(--white);
    background: var(--epoxy-blue-dark);
    border: 0;
    border-radius: 5px;
    font: inherit;
    font-weight: 800;
    cursor: pointer;
}

button:hover,
button:focus {
    background: var(--epoxy-red);
}

.site-footer {
    color: var(--white);
    background: #26343c;
}

.site-footer__inner {
    padding: 24px 0;
}

.site-footer p {
    margin: 6px 0;
}

.site-footer a {
    color: var(--white);
}

@media (max-width: 760px) {
    .site-header__inner {
        align-items: flex-start;
        flex-direction: column;
    }

    nav {
        gap: 12px;
    }

    .page-shell {
        width: min(100% - 18px, 1100px);
        padding: 20px 16px;
    }

    .form-section {
        padding: 16px;
    }
}

@media print {
    .site-header,
    .site-footer,
    button {
        display: none;
    }

    .page-shell {
        width: 100%;
        margin: 0;
        padding: 0;
        border: 0;
        box-shadow: none;
    }
}