:root {
    --font-display: 'Bricolage Grotesque', 'Segoe UI', system-ui, sans-serif;
    --font-reading: 'Source Serif 4', Georgia, 'Times New Roman', serif;
    --font-mono: 'JetBrains Mono', Consolas, 'Courier New', monospace;
    --ink: #1c2733;
    --ink-soft: #46586a;
    --accent: #006bb7;
    --rule: #dde4ea;
    --code-bg: #eef3f7;
    --code-ink: #1f4e79;
}

html, body {
    font-family: 'Segoe UI', system-ui, -apple-system, Helvetica, Arial, sans-serif;
    color: var(--ink);
}

h1, h2, h3, h4, h5, h6,
.card-title, .navbar-brand {
    font-family: var(--font-display);
    font-weight: 600;
    color: var(--ink);
}

/* ---- Lesson reading typography (rendered markdown) ---- */

.lesson-content {
    font-family: var(--font-reading);
    font-size: 1.075rem;
    line-height: 1.7;
    color: var(--ink);
    max-width: 46rem;
}

.lesson-content h1,
.lesson-content h2,
.lesson-content h3,
.lesson-content h4 {
    font-family: var(--font-display);
    line-height: 1.25;
    margin: 1.75em 0 0.5em;
}

.lesson-content > :first-child {
    margin-top: 0;
}

.lesson-content h1 {
    font-size: 1.75rem;
    font-weight: 700;
    padding-bottom: 0.35em;
    border-bottom: 2px solid var(--rule);
}

.lesson-content h2 {
    font-size: 1.4rem;
    font-weight: 700;
    padding-bottom: 0.3em;
    border-bottom: 1px solid var(--rule);
}

.lesson-content h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--ink-soft);
    text-transform: none;
}

.lesson-content p {
    margin-bottom: 1em;
}

.lesson-content ul,
.lesson-content ol {
    margin: 0 0 1.15em;
    padding-left: 1.5rem;
}

.lesson-content li {
    margin-bottom: 0.4em;
}

.lesson-content li > ul,
.lesson-content li > ol {
    margin-top: 0.4em;
    margin-bottom: 0;
}

.lesson-content a {
    color: var(--accent);
    text-decoration: underline;
    text-decoration-color: color-mix(in srgb, var(--accent) 35%, transparent);
    text-underline-offset: 3px;
    transition: text-decoration-color 0.15s ease;
}

.lesson-content a:hover {
    text-decoration-color: var(--accent);
}

.lesson-content strong {
    font-weight: 600;
}

.lesson-content code {
    font-family: var(--font-mono);
    font-size: 0.82em;
    background: var(--code-bg);
    color: var(--code-ink);
    padding: 0.15em 0.4em;
    border-radius: 4px;
}

.lesson-content pre {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.55;
    background: #0f1c28;
    color: #dce7f1;
    padding: 1rem 1.25rem;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 1.15em;
}

.lesson-content pre code {
    background: transparent;
    color: inherit;
    padding: 0;
    font-size: inherit;
}

.lesson-content blockquote {
    margin: 0 0 1.15em;
    padding: 0.5em 1.25em;
    border-left: 3px solid var(--accent);
    background: #f4f8fb;
    border-radius: 0 6px 6px 0;
    color: var(--ink-soft);
}

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

.lesson-content hr {
    border: 0;
    border-top: 1px solid var(--rule);
    margin: 2rem 0;
    opacity: 1;
}

.lesson-content img {
    max-width: 100%;
    border-radius: 8px;
    border: 1px solid var(--rule);
}

.lesson-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.15em;
    font-size: 0.95em;
}

.lesson-content th,
.lesson-content td {
    padding: 0.5em 0.75em;
    border: 1px solid var(--rule);
    text-align: left;
}

.lesson-content th {
    font-family: var(--font-display);
    font-weight: 600;
    background: #f4f8fb;
}

/* ---- Lesson activity cards ---- */

.lesson-activity-card {
    border: 1px solid var(--rule);
    border-radius: 10px;
    box-shadow: 0 1px 3px rgba(28, 39, 51, 0.06);
}

.lesson-activity-card .card-body {
    padding: 1.5rem 1.75rem;
}

.lesson-activity-card .card-title {
    font-size: 1.05rem;
    letter-spacing: 0.01em;
    color: var(--ink-soft);
    margin-bottom: 1rem;
}

a, .btn-link {
    color: #006bb7;
}

.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;
}

h1:focus {
    outline: none;
}

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

.invalid {
    outline: 1px solid #e50000;
}

.validation-message {
    color: #e50000;
}

.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."
    }

.darker-border-checkbox.form-check-input {
    border-color: #929292;
}

.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;
}