/* PYLI5 — base stylesheet (Phase 2 foundation).
   Brand colours come from CSS custom properties set in base.html. */

:root {
    --pyli5-primary: #2568A6;
    --pyli5-secondary: #FEC32A;
    --pyli5-text: #1a1a1a;
    --pyli5-muted: #5a5a5a;
    --pyli5-bg: #ffffff;
    --pyli5-bg-alt: #f5f7fa;
    --pyli5-border: #e2e8f0;
    --pyli5-radius: 8px;
    --pyli5-max-width: 72rem;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--pyli5-text);
    background: var(--pyli5-bg);
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: var(--pyli5-max-width);
    margin-inline: auto;
    padding-inline: 1.25rem;
}

a { color: var(--pyli5-primary); }

/* Accessibility helpers */
.visually-hidden {
    position: absolute !important;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0, 0, 0, 0);
    white-space: nowrap; border: 0;
}
.skip-link {
    position: absolute;
    left: -999px;
    background: var(--pyli5-primary);
    color: #fff;
    padding: 0.5rem 1rem;
    z-index: 100;
}
.skip-link:focus { left: 0.5rem; top: 0.5rem; }

:focus-visible { outline: 3px solid var(--pyli5-secondary); outline-offset: 2px; }

/* Header / nav */
.site-header { border-bottom: 1px solid var(--pyli5-border); }
.site-header__inner {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    padding-block: 0.75rem;
}
.site-logo { display: inline-flex; align-items: center; }
.primary-nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem 1rem;
    margin: 0; padding: 0;
}
.primary-nav a { text-decoration: none; padding: 0.35rem 0.25rem; display: inline-block; }
.primary-nav a:hover { text-decoration: underline; }
.site-search { margin-left: auto; }
.site-search input {
    padding: 0.4rem 0.6rem;
    border: 1px solid var(--pyli5-border);
    border-radius: var(--pyli5-radius);
}
.nav-toggle { display: none; }

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.7rem 1.25rem;
    border-radius: var(--pyli5-radius);
    text-decoration: none;
    font-weight: 600;
    margin: 0.25rem 0.5rem 0.25rem 0;
}
.btn--primary { background: var(--pyli5-primary); color: #fff; }
.btn--secondary { background: var(--pyli5-secondary); color: #1a1a1a; }
.btn:hover { filter: brightness(0.95); }

/* Hero */
.hero { background: var(--pyli5-bg-alt); padding-block: 3.5rem; }
.hero__headline { font-size: clamp(2rem, 5vw, 3rem); margin: 0 0 0.5rem; }
.hero__subheadline { font-size: 1.2rem; color: var(--pyli5-muted); max-width: 40rem; }
.hero__actions { margin-top: 1.5rem; }

.home-intro { padding-block: 2.5rem; }

/* Footer */
.site-footer { border-top: 1px solid var(--pyli5-border); margin-top: 3rem; padding-block: 2rem; background: var(--pyli5-bg-alt); }
.footer-nav ul { list-style: none; display: flex; flex-wrap: wrap; gap: 0.5rem 1.25rem; margin: 0 0 1rem; padding: 0; }
.footer-nav a { text-decoration: none; }
.site-footer__legal { color: var(--pyli5-muted); font-size: 0.9rem; display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 0.25rem 1rem; }
.site-footer__legal p { margin: 0; }
.site-footer__contact { margin-left: auto; }

/* Newsletter */
.newsletter-cta { margin: 1.5rem 0; }
.newsletter-form { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.newsletter-form input { padding: 0.5rem 0.7rem; border: 1px solid var(--pyli5-border); border-radius: var(--pyli5-radius); min-width: 16rem; }
.newsletter-form button, .search-page__form button {
    padding: 0.5rem 1rem; border: 0; border-radius: var(--pyli5-radius);
    background: var(--pyli5-primary); color: #fff; cursor: pointer;
}
.newsletter-cta__heading { margin: 0 0 0.5rem; }
.newsletter-cta__intro { color: var(--pyli5-muted); margin: 0 0 1rem; }

/* Homepage newsletter — prominent callout card, distinct from the footer form. */
.newsletter-cta--home {
    background: #fff;
    border: 1px solid var(--pyli5-border);
    border-top: 4px solid var(--pyli5-secondary);
    border-radius: var(--pyli5-radius);
    padding: 2rem;
    text-align: center;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.05);
}
.newsletter-cta--home .newsletter-cta__heading { font-size: 1.6rem; color: var(--pyli5-primary); }
.newsletter-cta--home .newsletter-cta__intro { max-width: 42rem; margin-inline: auto; }
.newsletter-cta--home .newsletter-form { justify-content: center; }

/* Error + search pages */
.error-page, .search-page { padding-block: 3rem; }
.search-results { list-style: none; padding: 0; }
.search-results li { margin-bottom: 1.25rem; }

/* Mobile nav */
@media (max-width: 720px) {
    .nav-toggle {
        display: inline-flex;
        flex-direction: column;
        gap: 4px;
        margin-left: auto;
        background: none; border: 0; cursor: pointer; padding: 0.4rem;
    }
    .nav-toggle span { width: 24px; height: 2px; background: var(--pyli5-text); display: block; }
    .primary-nav { flex-basis: 100%; display: none; }
    .primary-nav.is-open { display: block; }
    .primary-nav ul { flex-direction: column; }
    .site-search { margin-left: 0; flex-basis: 100%; }
    .site-search input { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
    * { animation: none !important; transition: none !important; }
}

/* Homepage sections */
.home-section { padding-block: 2.5rem; }
.home-section--alt { background: var(--pyli5-bg-alt); }
.home-section h2 { margin-top: 0; }
.path-preview { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); margin-bottom: 1rem; }
.path-preview__card { background: #fff; border: 1px solid var(--pyli5-border); border-radius: var(--pyli5-radius); padding: 1rem; }
.path-preview__card h3 { margin: 0 0 0.4rem; color: var(--pyli5-primary); }
a.path-preview__card { display: block; color: var(--pyli5-text); text-decoration: none; transition: border-color 0.15s ease, box-shadow 0.15s ease; }
a.path-preview__card:hover, a.path-preview__card:focus-visible { border-color: var(--pyli5-primary); box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08); }
.card-list { list-style: none; padding: 0; display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); }
.card { background: #fff; border: 1px solid var(--pyli5-border); border-radius: var(--pyli5-radius); padding: 1rem 1.25rem; }
.card h2, .card h3 { margin-top: 0; }
.card__meta { color: var(--pyli5-muted); font-size: 0.85rem; }
.coming-soon { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 0.5rem 1.25rem; }
.coming-soon a { display: inline-block; padding: 0.4rem 0.9rem; background: var(--pyli5-bg-alt); border-radius: 999px; text-decoration: none; }
.content-page { padding-block: 2.5rem; }
.content-page__intro { font-size: 1.1rem; color: var(--pyli5-muted); }
.lesson-unit { scroll-margin-top: 1.5rem; }
.lesson-unit__heading { color: var(--pyli5-primary); margin: 1.75rem 0 0.5rem; }
.lesson-list { padding-left: 1.2rem; }
.lesson-list__item { margin-bottom: 0.4rem; }
.lesson-list__time { color: var(--pyli5-muted); font-size: 0.85rem; margin-left: 0.4rem; }
.glossary-list dt { font-weight: 600; margin-top: 0.8rem; }
.lesson__subtitle { font-size: 1.15rem; color: var(--pyli5-muted); }
.lesson__meta { display: flex; flex-wrap: wrap; gap: 0.5rem 1rem; align-items: center; margin: 0.5rem 0; color: var(--pyli5-muted); font-size: 0.9rem; }
.lesson__complete.is-complete { background: #16a34a; color: #fff; }
.placeholder__message { font-size: 1.2rem; font-weight: 600; }