/* ==========================================================================
   Chrome + shared editorial shell for content pages.

   1. Chrome rules required by the injected includes/header.html /
      includes/footer.html partials (selection colour, scrollbar, hero grid,
      nav-scrolled state) — identical to the inline styles on the main pages.
   2. Shared hero system used by blog posts, the series hub, and teaching:
      hero spacing under the fixed nav, gradient h1, bordered subtitle, flat
      metadata row, and the hero aside card.
   3. Thank-you page layout.
   ========================================================================== */

::selection {
    background: rgba(37, 99, 235, 0.3);
    color: #ffffff;
}

/* Custom scrollbar – hidden by default, visible on hover (matches main pages) */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: transparent; border-radius: 3px; }
body:hover::-webkit-scrollbar-thumb { background: rgba(148,163,184,0.35); }
body:hover::-webkit-scrollbar-thumb:hover { background: rgba(148,163,184,0.55); }
html { scrollbar-width: thin; scrollbar-color: transparent transparent; }
body:hover { scrollbar-color: rgba(148,163,184,0.35) transparent; }
@media (hover: none) {
    ::-webkit-scrollbar { display: none; }
    html { scrollbar-width: none; }
}

/* Grid background rendered by the injected header */
.hero-grid {
    background-image:
        linear-gradient(rgba(37, 99, 235, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(37, 99, 235, 0.06) 1px, transparent 1px),
        linear-gradient(rgba(37, 99, 235, 0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(37, 99, 235, 0.025) 1px, transparent 1px);
    background-size: 50px 50px, 50px 50px, 250px 250px, 250px 250px;
    mask-image: radial-gradient(circle at 50% 0%, black, transparent 80%);
    -webkit-mask-image: radial-gradient(circle at 50% 0%, black, transparent 80%);
}

/* Nav scroll state (matches main pages) */
#main-nav { transition: background-color 250ms ease, border-color 250ms ease, box-shadow 250ms ease; }
#main-nav.nav-scrolled {
    background-color: rgba(11, 31, 58, 0.75);
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.18);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}
#main-nav.nav-scrolled .nav-brand { color: rgba(255,255,255,0.95) !important; }
#main-nav.nav-scrolled .nav-link { color: rgba(226,232,240,0.78) !important; }
#main-nav.nav-scrolled .nav-link:hover { color: rgba(255,255,255,0.98) !important; }
#main-nav.nav-scrolled .nav-link.is-active { color: rgba(255,255,255,0.98) !important; }
#main-nav.nav-scrolled .nav-btn {
    color: rgba(255,255,255,0.95) !important;
    border-color: rgba(226,232,240,0.25) !important;
    background-color: rgba(255,255,255,0.08) !important;
}
#main-nav.nav-scrolled .nav-btn:hover {
    background-color: rgba(255,255,255,0.14) !important;
    border-color: rgba(147,197,253,0.55) !important;
}
#main-nav.nav-scrolled #mobile-menu-btn { color: rgba(255,255,255,0.9) !important; }
#main-nav.nav-scrolled #mobile-menu {
    background-color: rgba(11, 31, 58, 0.92) !important;
    border-color: rgba(255,255,255,0.08) !important;
}
#main-nav.nav-scrolled #mobile-menu a { color: rgba(226,232,240,0.85) !important; }
#main-nav.nav-scrolled #mobile-menu a:hover { color: rgba(255,255,255,1) !important; }

/* --------------------------------------------------------------------------
   Shared hero system
   -------------------------------------------------------------------------- */
.content-page .page-header,
.content-page .blog-post-hero,
.content-page .collection-hero {
    padding: clamp(7.5rem, 15vh, 9.5rem) 0 clamp(2.5rem, 5vw, 3.5rem);
}

.content-page .hero-copy {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 1.1rem;
    min-width: 0;
}

/* Gradient headline, matching research.html / contact.html */
.content-page .page-header h1,
.content-page .blog-post-hero h1,
.content-page .collection-hero h1 {
    margin: 0;
    font-size: clamp(2.5rem, 5.2vw, 3.75rem);
    font-weight: 300;
    line-height: 1.08;
    letter-spacing: -0.025em;
    background-image: linear-gradient(to right, #0f172a, #1e3a8a 55%, #1d4ed8);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
}

/* Subtitle with the main-site left hairline */
.content-page .hero-subtitle {
    margin: 0;
    max-width: 62ch;
    padding-left: 1.5rem;
    border-left: 1px solid rgba(71, 85, 105, 0.2);
    font-size: 0.9375rem;
    font-weight: 300;
    line-height: 1.75;
    color: var(--slate-700);
}

/* Metadata row — flat key/value line under a hairline, not pill boxes */
.content-page .hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.1rem 2.25rem;
    width: 100%;
    margin: 0.75rem 0 0;
    padding: 1.25rem 0 0;
    border-top: 1px solid rgba(148, 163, 184, 0.25);
}

.content-page .hero-meta .meta-item {
    display: grid;
    gap: 0.3rem;
    align-content: start;
}

.content-page .hero-meta dt {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--slate-400);
}

.content-page .hero-meta dt iconify-icon {
    color: var(--blue-600);
    font-size: 1.3em;
}

.content-page .hero-meta dd {
    margin: 0;
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1.5;
    color: var(--slate-800);
}

.content-page .hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

/* Hero aside card (series summary / quick links) */
.content-page .hero-aside {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
}

.content-page .hero-aside h2 {
    margin: 0;
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--slate-900);
}

.content-page .hero-aside p {
    margin: 0;
    font-size: 0.875rem;
    font-weight: 300;
    line-height: 1.7;
    color: var(--slate-600);
}

.content-page .series-key-points {
    display: grid;
    gap: 0.65rem;
    width: 100%;
    margin: 0;
    padding: 0;
    list-style: none;
}

.content-page .series-key-points li {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    font-size: 0.875rem;
    font-weight: 300;
    line-height: 1.6;
    color: var(--slate-600);
}

.content-page .series-key-points iconify-icon {
    flex-shrink: 0;
    margin-top: 0.2em;
    color: var(--blue-600);
}

.content-page .series-key-points a {
    color: var(--blue-600);
    text-decoration: none;
}

.content-page .series-key-points a:hover {
    color: var(--blue-800);
    text-decoration: underline;
    text-underline-offset: 3px;
}

/* --------------------------------------------------------------------------
   Thank-you page
   -------------------------------------------------------------------------- */
.content-page .thank-you-main {
    display: grid;
    place-items: center;
    min-height: 72vh;
    padding: 9rem 0 5rem;
}

.content-page .thank-you-card {
    max-width: 640px;
    margin-inline: auto;
    padding: clamp(2.5rem, 6vw, 3.5rem);
    text-align: center;
}

.content-page .thank-you-icon {
    display: inline-grid;
    place-items: center;
    width: 4.5rem;
    height: 4.5rem;
    margin-bottom: 1.5rem;
    border-radius: var(--radius-full);
    background: rgba(239, 246, 255, 0.9);
    border: 1px solid rgba(191, 219, 254, 0.6);
    color: var(--blue-600);
    font-size: 2rem;
}

.content-page .thank-you-card h1 {
    margin: 0 0 1rem;
    font-size: clamp(1.875rem, 4vw, 2.5rem);
    font-weight: 300;
}

.content-page .thank-you-card p {
    margin: 0 0 2rem;
    font-size: 0.9375rem;
    font-weight: 300;
    line-height: 1.8;
    color: var(--slate-600);
}

.content-page .thank-you-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
}

@media (max-width: 900px) {
    .content-page .page-header,
    .content-page .blog-post-hero,
    .content-page .collection-hero {
        padding-top: 7rem;
    }
}