/**
 * Humanity & AI — The Irreplaceable Human
 * AIAlchemyHub Theme — Governance, Trust & Human-Centred Intelligence
 * Minimal, content-first theme using Bootstrap 5 for layout and grids.
 */

/* =========================================================
   1. DESIGN TOKENS
   ========================================================= */
:root {
    --t-navy: #1A2332;
    --t-navy-700: #223042;
    --t-navy-600: #2B3B50;
    --t-navy-500: #3B4D65;
    --t-navy-rgb: 26, 35, 50;

    --t-cyan: #1E40AF;
    --t-cyan-600: #1A3A9E;
    --t-cyan-700: #16308A;
    --t-cyan-rgb: 30, 64, 175;

    --t-white: #FAFAF7;
    --t-white-rgb: 250, 250, 247;

    --t-amber: #B45309;
    --t-amber-rgb: 180, 83, 9;

    --t-primary: var(--t-cyan);
    --t-primary-rgb: var(--t-cyan-rgb);
    --t-secondary: #64748B;
    --t-accent: var(--t-amber);

    --t-bg: #FAFAF7;
    --t-bg-alt: #F1EFE8;
    --t-surface: #FFFFFF;
    --t-surface-2: #F5F3EC;
    --t-border: #E7E5E0;

    --t-text: #1A2332;
    --t-text-muted: #64748B;
    --t-text-invert: #FAFAF7;

    --t-radius: .5rem;
    --t-radius-lg: 1rem;
    --t-shadow-sm: 0 1px 2px rgba(26, 35, 50, .06), 0 1px 3px rgba(26, 35, 50, .04);
    --t-shadow: 0 10px 28px rgba(26, 35, 50, .10), 0 2px 6px rgba(26, 35, 50, .06);
    --t-shadow-cyan: 0 10px 28px rgba(30, 64, 175, .22);

    --t-font-body: 'Inter', system-ui, -apple-system, sans-serif;
    --t-font-display: 'Fraunces', Georgia, serif;
    --t-font-mono: 'JetBrains Mono', Consolas, monospace;

    --t-navbar-bg: #1A2332;
    --t-navbar-text: #FAFAF7;
    --t-navbar-link: #E2E6EE;
    --t-navbar-link-hover: #FFFFFF;
    --t-navbar-hover-bg: rgba(30, 64, 175, .4);
    --t-navbar-border: rgba(255, 255, 255, .08);
    --t-navbar-shadow: 0 4px 20px rgba(26, 35, 50, .25);
    --t-navbar-brand: #FFFFFF;

    --bs-body-bg: var(--t-bg);
    --bs-body-color: var(--t-text);
    --bs-body-font-family: var(--t-font-body);
    --bs-primary: var(--t-primary);
    --bs-primary-rgb: var(--t-primary-rgb);
    --bs-border-color: var(--t-border);
    --bs-border-radius: var(--t-radius);
    --bs-secondary-color: var(--t-text-muted);
}

/* =========================================================
   2. BASE AND ACCESSIBILITY
   ========================================================= */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 5rem;
}

body {
    margin: 0;
    background: var(--t-bg);
    color: var(--t-text);
    font-family: var(--t-font-body);
    font-size: 1rem;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--t-primary);
    text-decoration-thickness: 1px;
    text-underline-offset: .2em;
    transition: color 0.15s ease-in-out;
}

a:hover {
    color: var(--t-cyan-600);
}

a:focus-visible,
button:focus-visible,
.btn:focus-visible,
.nav-link:focus-visible {
    outline: 3px solid rgba(var(--t-cyan-rgb), .55);
    outline-offset: 3px;
}

/* =========================================================
   3. HEADER AND NAVIGATION
   ========================================================= */
.navbar {
    background: var(--t-navbar-bg) !important;
    border-bottom: 1px solid var(--t-navbar-border);
    box-shadow: var(--t-navbar-shadow);
}

.navbar .navbar-brand {
    color: var(--t-navbar-brand) !important;
    font-family: var(--t-font-display);
    font-size: 1.3rem;
    font-weight: 600;
    letter-spacing: -.02em;
}

.navbar .navbar-brand:hover {
    color: #FFFFFF !important;
}

.navbar .nav-link {
    padding: .55rem 1rem;
    border-radius: var(--t-radius);
    color: var(--t-navbar-link) !important;
    font-size: .95rem;
    font-weight: 500;
    transition: background-color .18s ease, color .18s ease;
}

.navbar .nav-link:hover,
.navbar .nav-link:focus,
.navbar .nav-link.active {
    background: var(--t-navbar-hover-bg);
    color: var(--t-navbar-link-hover) !important;
}

.navbar .navbar-toggler {
    border-color: rgba(255, 255, 255, .35);
}

.navbar .navbar-toggler-icon {
    filter: brightness(0) invert(1);
}

/* =========================================================
   4. MAIN CONTENT AND HEADINGS
   ========================================================= */
main {
    min-height: 65vh;
    padding-top: 0rem;
    padding-bottom: 4rem;
}

main h1,
main h2,
main h3,
main h4,
main h5 {
    font-family: var(--t-font-display);
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -.015em;
}

main h1 {
    margin-bottom: 1.5rem;
    color: #0f766e; /* Professional Deep Teal */
    font-size: clamp(1.4rem, 2.5vw, 2.1rem); /* Reduced by ~30% */
    line-height: 1.25;
}

main h2 {
    margin-top: 2.75rem;
    margin-bottom: 1rem;
    padding-bottom: .45rem;
    border-bottom: 1px solid var(--t-border);
    color: var(--t-navy);
    font-size: clamp(1.5rem, 3vw, 2rem);
}

main h3 {
    margin-top: 2rem;
    margin-bottom: .75rem;
    color: var(--t-primary);
    font-size: 1.35rem;
}

main p {
    margin-bottom: 1.25rem;
}

main img {
    max-width: 100%;
    height: auto;
    border-radius: var(--t-radius);
}

main hr {
    margin: 2.5rem 0;
    border: 0;
    border-top: 2px solid var(--t-border);
    opacity: 1;
}

/* =========================================================
   VECTOR HERO BANNER STRIP
   ========================================================= */
.hero-vector-strip {
    position: relative;
    width: 100%;
    min-height: 280px;
    background-color: var(--t-navy, #1A2332);
    overflow: hidden;
    border-bottom: 4px solid var(--t-amber, #B45309);
    margin-bottom: 3rem;
}

.hero-vector-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.22;
    pointer-events: none;
    object-fit: cover;
}

.hero-vector-content {
    position: relative;
    z-index: 2;
}

/* =========================================================
   5. LONG-FORM ARTICLE READER VIEW
   ========================================================= */
.article-body {
    font-family: var(--t-font-display);
    font-size: 1.15rem;
    line-height: 1.9;
    color: #262626;
}

.article-body p {
    margin-bottom: 1.5rem;
}

main blockquote {
    margin: 2rem 0;
    padding: 1rem 1.25rem;
    border-left: 4px solid var(--t-primary);
    background: var(--t-surface-2);
    color: var(--t-text);
}

/* =========================================================
   6. CARDS & TABLE OF CONTENTS
   ========================================================= */
main .card {
    height: 100%;
    border: 1px solid var(--t-border);
    border-radius: var(--t-radius-lg);
    background: var(--t-surface);
    box-shadow: var(--t-shadow-sm);
    transition: border-color .18s ease, box-shadow .18s ease, transform .18s ease;
}

main .card:hover {
    border-color: rgba(var(--t-cyan-rgb), .4);
    box-shadow: var(--t-shadow);
    transform: translateY(-2px);
}

.toc-link {
    color: #334155;
    transition: color 0.15s ease-in-out, padding-left 0.15s ease-in-out;
}

.toc-link:hover {
    color: var(--t-primary) !important;
    padding-left: 4px;
}

/* =========================================================
   7. FOOTER
   ========================================================= */
footer {
    padding: 2rem 0;
    border-top: 3px solid var(--t-primary);
    background: var(--t-navy);
    color: var(--t-text-invert);
    font-size: .9rem;
}

footer a {
    color: #C7D2FE;
    text-decoration: none;
}

footer a:hover {
    color: #FFFFFF;
    text-decoration: underline;
}

/* =========================================================
   8. RESPONSIVE MEDIA QUERIES
   ========================================================= */
@media (max-width: 767.98px) {
    main {
        padding-top: 0rem;
        padding-bottom: 2.5rem;
    }
}