/* ==========================================================================
   Varholick Lab — shared design system
   Minimalist, whitespace-forward, Kennesaw State palette (black / gold / white).
   Loaded on every page alongside the Tailwind CDN.
   ========================================================================== */

:root {
    --ksu-black: #0B1315;
    --ksu-gold: #FDBB30;
    --ksu-grey: #C5C6C8;
    --ksu-cream: #FAF9F6;
    --font-display: 'Space Grotesk', 'Inter', system-ui, sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', system-ui, sans-serif;
    color: var(--ksu-black);
    background-color: #ffffff;
    -webkit-font-smoothing: antialiased;
    font-size: 1.0625rem;   /* ~17px base for a more editorial feel */
    line-height: 1.7;
}

/* Accessible skip link (visually hidden until focused) */
.skip-link {
    position: absolute;
    left: -999px;
    top: 0;
    background: var(--ksu-black);
    color: #fff;
    padding: 0.5rem 1rem;
    z-index: 100;
}
.skip-link:focus {
    left: 0.5rem;
    top: 0.5rem;
}

/* --- Headings: display grotesque, large, tightly tracked --- */
h1, h2, h3 {
    font-family: var(--font-display);
    letter-spacing: -0.02em;
}
.font-display {
    font-family: var(--font-display);
}

/* ==========================================================================
   Scroll-reveal motion (Sears-style fade / slide-up on enter)
   ========================================================================== */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: opacity, transform;
}
.reveal.is-visible {
    opacity: 1;
    transform: none;
}
@media (prefers-reduced-motion: reduce) {
    .reveal {
        opacity: 1 !important;
        transform: none !important;
        transition: none !important;
    }
}

/* Parallax hero — image holds while content scrolls over it */
.hero-parallax {
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
    background-attachment: fixed;
}
@media (max-width: 768px) {
    /* iOS/Android don't handle fixed backgrounds well */
    .hero-parallax {
        background-attachment: scroll;
    }
}

/* Section vertical rhythm — generous whitespace */
.section {
    padding-top: 5rem;
    padding-bottom: 5rem;
}
@media (min-width: 768px) {
    .section {
        padding-top: 7rem;
        padding-bottom: 7rem;
    }
}

/* A short gold rule used under section labels / eyebrows */
.eyebrow {
    display: inline-block;
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--ksu-black);
}
.eyebrow::after {
    content: '';
    display: block;
    width: 2.5rem;
    height: 3px;
    margin-top: 0.6rem;
    background: var(--ksu-gold);
}

/* Constrain body copy for readability */
.prose-width {
    max-width: 65ch;
}

/* Numbered section badge — gold circle with dark numeral (pops on any band) */
.num-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    border-radius: 9999px;
    background-color: var(--ksu-gold);
    color: var(--ksu-black);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.125rem;
    line-height: 1;
}

/* Dark full-bleed band helpers */
.section-dark {
    background-color: var(--ksu-black);
    color: #ffffff;
}
.section-dark h1,
.section-dark h2,
.section-dark h3 {
    color: #ffffff;
}
.section-dark .eyebrow {
    color: #ffffff;
}
.section-dark .prose-width,
.section-dark p {
    color: rgba(255, 255, 255, 0.82);
}
/* Let dark bands carry dense content (subsections, lists, links) legibly */
.section-dark h4,
.section-dark h5 {
    color: #ffffff;
}
.section-dark .text-ksu-black {
    color: #ffffff;
}
.section-dark .text-gray-700,
.section-dark .text-gray-600,
.section-dark .text-gray-500 {
    color: rgba(255, 255, 255, 0.72);
}
.section-dark li {
    color: rgba(255, 255, 255, 0.82);
}
.section-dark .link-gold {
    color: #ffffff;
}
.section-dark .border-ksu-grey,
.section-dark .border-t {
    border-color: rgba(255, 255, 255, 0.18);
}

/* --- Transparent header over the hero, solid on scroll (homepage) --- */
.site-header {
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
.site-header[data-transparent-header] {
    background-color: transparent;
    border-color: transparent;
}
.site-header[data-transparent-header] .nav-link,
.site-header[data-transparent-header] .brand-title {
    color: #ffffff;
}
.site-header[data-transparent-header] .brand-subtitle {
    color: rgba(255, 255, 255, 0.75);
}
.site-header[data-transparent-header] .menu-icon {
    color: #ffffff;
}
.brand-logo {
    /* Force a monochrome black silhouette of the logo on light headers */
    filter: brightness(0);
    transition: filter 0.3s ease;
}
.site-header[data-transparent-header] .brand-logo {
    /* White over the dark hero */
    filter: brightness(0) invert(1);
}
/* Solid state (also the default look once scrolled) */
.site-header.is-solid {
    background-color: rgba(255, 255, 255, 0.95);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid rgba(197, 198, 200, 0.6);
}
.site-header.is-solid .nav-link,
.site-header.is-solid .brand-title,
.site-header.is-solid .menu-icon {
    color: var(--ksu-black);
}
.site-header.is-solid .brand-subtitle {
    color: #6b7280;
}

/* --- Navigation link with animated gold underline --- */
.nav-link {
    position: relative;
    padding-bottom: 4px;
    color: var(--ksu-black);
    font-weight: 500;
    transition: color 0.2s ease;
}
.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--ksu-gold);
    transition: width 0.3s ease-in-out;
}
.nav-link:hover::after,
.nav-link.is-active::after {
    width: 100%;
}
.nav-link.is-active {
    font-weight: 600;
}
/* White nav links (e.g. homepage's dark mobile-menu overlay) */
.nav-link.text-white {
    color: #ffffff;
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    font-weight: 600;
    padding: 0.75rem 1.75rem;
    border-radius: 9999px;
    transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
    text-align: center;
}
.btn:hover {
    transform: translateY(-1px);
}
.btn-primary {
    background-color: var(--ksu-black);
    color: #fff;
}
.btn-primary:hover {
    background-color: #000;
}
.btn-gold {
    background-color: var(--ksu-gold);
    color: var(--ksu-black);
}
.btn-gold:hover {
    background-color: #f0ad1c;
}
.btn-outline {
    border: 2px solid currentColor;
}
.btn-outline-light {
    border: 2px solid #fff;
    color: #fff;
}
.btn-outline-light:hover {
    background-color: #fff;
    color: var(--ksu-black);
}

/* Inline text link */
.link-gold {
    color: var(--ksu-black);
    font-weight: 600;
    border-bottom: 2px solid var(--ksu-gold);
    transition: color 0.2s ease;
}
.link-gold:hover {
    color: #000;
}

/* --- Alternating text / image content rows (Sears-style editorial layout) --- */
.content-row {
    display: grid;
    gap: 2.5rem;
    align-items: center;
}
@media (min-width: 768px) {
    .content-row {
        grid-template-columns: 1fr 1fr;
        gap: 4rem;
    }
    /* Reverse every other row: image left, text right */
    .content-row.reverse .content-row__media {
        order: 2;
    }
    .content-row.reverse .content-row__text {
        order: 1;
    }
}
.content-row__media img {
    width: 100%;
    height: auto;
    border-radius: 0.5rem;
    display: block;
}

/* --- Simple hairline divider --- */
.hairline {
    border: 0;
    border-top: 1px solid var(--ksu-grey);
}