html, body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

h1:focus {
    outline: none;
}

a, .btn-link {
    color: #0071c1;
}

.btn-primary {
    color: #fff;
    background-color: #1b6ec2;
    border-color: #1861ac;
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
  box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
}

.content {
    padding-top: 1.1rem;
}

.valid.modified:not([type=checkbox]) {
    outline: 1px solid #26b050;
}

.invalid {
    outline: 1px solid red;
}

.validation-message {
    color: red;
}

#blazor-error-ui {
    color-scheme: light only;
    background: lightyellow;
    bottom: 0;
    box-shadow: 0 -1px 2px rgba(0, 0, 0, 0.2);
    box-sizing: border-box;
    display: none;
    left: 0;
    padding: 0.6rem 1.25rem 0.7rem 1.25rem;
    position: fixed;
    width: 100%;
    z-index: 1000;
}

    #blazor-error-ui .dismiss {
        cursor: pointer;
        position: absolute;
        right: 0.75rem;
        top: 0.5rem;
    }

.blazor-error-boundary {
    background: url(data:image/svg+xml;base64,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) no-repeat 1rem/1.8rem, #b32121;
    padding: 1rem 1rem 1rem 3.7rem;
    color: white;
}

    .blazor-error-boundary::after {
        content: "An error has occurred."
    }

code {
    color: #c02d76;
}

.form-floating > .form-control-plaintext::placeholder, .form-floating > .form-control::placeholder {
    color: var(--bs-secondary-color);
    text-align: end;
}

.form-floating > .form-control-plaintext:focus::placeholder, .form-floating > .form-control:focus::placeholder {
    text-align: start;
}

/* --- Site shell (M4) ------------------------------------------------------ */

:root {
    --shell-max: 72rem;
    --nav-width: 15rem;
    --accent: #0071c1;
    --border: #e2e5e9;
    --muted: #5c6670;
}

body {
    margin: 0;
    color: #1b1f23;
    line-height: 1.6;
}

.site-shell {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.site-header {
    display: flex;
    align-items: baseline;
    gap: 1rem;
    flex-wrap: wrap;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
}

.site-header .brand {
    font-size: 1.25rem;
    font-weight: 700;
    text-decoration: none;
    color: inherit;
}

.site-header .tagline {
    color: var(--muted);
    font-size: 0.9rem;
}

.site-body {
    display: flex;
    flex: 1;
    gap: 2rem;
    width: 100%;
    max-width: var(--shell-max);
    margin: 0 auto;
    padding: 1.5rem;
    box-sizing: border-box;
    align-items: flex-start;
}

/* Sticky so the persistent nav keeps its position while the main column scrolls. */
.site-nav {
    flex: 0 0 var(--nav-width);
    position: sticky;
    top: 1.5rem;
}

.nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-list li {
    margin: 0.125rem 0;
}

.nav-link {
    display: block;
    padding: 0.35rem 0.6rem;
    border-radius: 0.25rem;
    text-decoration: none;
    color: var(--muted);
}

.nav-link:hover {
    background: #f3f5f7;
    color: #1b1f23;
}

.nav-link.active {
    background: #e8f1fa;
    color: var(--accent);
    font-weight: 600;
}

.site-main {
    flex: 1;
    min-width: 0;
}

.site-footer {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border);
    color: var(--muted);
    font-size: 0.9rem;
}

/* --- Prose (rendered Markdown) ------------------------------------------- */

.prose h1 {
    margin-top: 0;
    font-size: 2rem;
}

.prose h2 {
    margin-top: 2rem;
    padding-bottom: 0.25rem;
    border-bottom: 1px solid var(--border);
}

.prose pre {
    overflow-x: auto;
    padding: 0.85rem 1rem;
    border: 1px solid var(--border);
    border-radius: 0.35rem;
    background: #f7f9fa;
}

.prose :not(pre) > code {
    padding: 0.1rem 0.3rem;
    border-radius: 0.2rem;
    background: #f3f5f7;
    font-size: 0.9em;
}

.prose table {
    border-collapse: collapse;
}

.prose th,
.prose td {
    padding: 0.4rem 0.7rem;
    border: 1px solid var(--border);
}

/* Heading anchors (Task 9). The "#" is real link text, not generated content, so assistive
   technology can announce the link; it is only visually de-emphasized until hover or focus. */
.headlink {
    margin-left: 0.4rem;
    color: var(--muted);
    text-decoration: none;
    opacity: 0;
}

h2:hover .headlink,
h3:hover .headlink,
h4:hover .headlink,
h5:hover .headlink,
h6:hover .headlink,
.headlink:focus {
    opacity: 1;
}

@media (max-width: 48rem) {
    .site-body {
        flex-direction: column;
    }

    .site-nav {
        position: static;
        flex-basis: auto;
        width: 100%;
    }
}