/* --- Layout, Grid, & Base Positioning --- */
/* Universal Box Sizing */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    background-color: var(--color-outer-bg);
    overflow-x: hidden;
    overscroll-behavior-y: contain;
}

/* Static fixed ambient light orbs layer (prevents html background-attachment: fixed scroll jitter) */
html::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-image: radial-gradient(at 85% 15%, var(--bg-gradient-1) 0px, transparent 55%),
                      radial-gradient(at 15% 25%, var(--bg-gradient-2) 0px, transparent 50%),
                      radial-gradient(at 85% 85%, var(--bg-gradient-3) 0px, transparent 60%);
    pointer-events: none;
    z-index: 0;
}

body {
    margin: 0;
    padding: 0;
    background-color: transparent;
    overflow-y: auto;
    /* Enable vertical scroll fallback */
    overflow-x: hidden;
    /* Hide horizontal scrollbar */
    width: 100%;
    overscroll-behavior-y: contain;
}

.site-bg-wallpaper {
    position: fixed;
    top: 0;
    left: var(--container-left, max(0px, calc(50% - 720px)));
    width: var(--container-width, min(100%, 1440px));
    height: 100vh;
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    /* WebP line is the fallback for browsers without image-set() type() support */
    background-image: url('../images/bg-facade-landscape-2k.webp');
    background-image: image-set(
        url('../images/bg-facade-landscape-2k.avif') type('image/avif'),
        url('../images/bg-facade-landscape-2k.webp') type('image/webp'));
    opacity: 0.25;
    /* Hardware-accelerated grayscale filter instead of non-separable mix-blend-mode: luminosity shader readback */
    filter: grayscale(100%);
    /* Kept intentionally: dedicated GPU layer for the fixed wallpaper. Milestone 54 fixed
       Galaxy Tab compositing issues; removal can't be validated without that device. */
    will-change: transform;
    transform: translateZ(0);
    pointer-events: none;
    z-index: 0;
}

#responsive-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 0;
    display: block;
}

.content-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    pointer-events: none;
    z-index: 10;
}

.accent-block {
    position: absolute;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: transparent;
    pointer-events: auto;
}

.text-block {
    position: absolute;
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--glass-bg, var(--color-bg));
    backdrop-filter: blur(var(--glass-blur, 12px)) saturate(var(--glass-saturate, 130%));
    -webkit-backdrop-filter: blur(var(--glass-blur, 12px)) saturate(var(--glass-saturate, 130%));
    contain: layout paint;
    border-top: 1px solid var(--glass-border-top, rgba(255, 255, 255, 0.95));
    border-left: 1px solid var(--glass-border-left, rgba(255, 255, 255, 0.95));
    border-bottom: 1px solid var(--glass-border-bottom, rgba(255, 255, 255, 0.35));
    border-right: 1px solid var(--glass-border-right, rgba(255, 255, 255, 0.35));
    box-shadow: var(--glass-shadow, 0 16px 40px rgba(72, 123, 195, 0.08));
    border-radius: 20px;
    box-sizing: border-box;
    overflow: hidden;
    /* Ensure image fits inside borders */
    transition: box-shadow 0.4s cubic-bezier(0.165, 0.84, 0.44, 1),
                border-color 0.4s cubic-bezier(0.165, 0.84, 0.44, 1),
                background 0.4s cubic-bezier(0.165, 0.84, 0.44, 1),
                transform 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

/* Light Glass Inner Bevel & Edge Light Trap */
.text-block::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: inherit;
    box-shadow: var(--glass-inner-bevel, inset 0 2px 6px rgba(255, 255, 255, 0.9), inset 0 -1px 2px rgba(255, 255, 255, 0.4));
    pointer-events: none;
    z-index: 2;
    transition: box-shadow 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.text-block:hover {
    box-shadow: 0 22px 50px 0 rgba(72, 123, 195, 0.12), 0 6px 18px rgba(0, 0, 0, 0.03);
    border-top-color: rgba(255, 255, 255, 1);
    border-left-color: rgba(255, 255, 255, 1);
}

.text-block:hover::before {
    box-shadow: var(--glass-inner-bevel, inset 0 2px 6px rgba(255, 255, 255, 0.9), inset 0 -1px 2px rgba(255, 255, 255, 0.4)), inset 0 0 24px rgba(255, 255, 255, 0.5);
}

/* Tactile Lift exclusively for the AI Query Hero Block */
#hero-block .text-block:hover {
    transform: translateY(-2px);
}

.text-block.transparent-mask {
    background-color: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border: none;
    box-shadow: none;
}

.avatar-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    pointer-events: none;
    user-select: none;
    border-radius: 12px;
}

.headline {
    font-family: 'Young Serif', serif;
    font-weight: 400;
    font-size: 24px;
    color: var(--color-text);
    letter-spacing: -0.02em;
    line-height: 1.2;
    margin-bottom: 8px;
}

.body-text {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 500;
    font-size: 11.5px;
    color: var(--color-text);
    letter-spacing: -0.015em;
}

.text-wrapper {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    /* Centered horizontally */
    padding-left: 16px;
    padding-right: 16px;
    text-align: center;
    /* Centered text alignment */
    user-select: none;
    width: 100%;
    height: 100%;
}

.insights-btn {
    position: absolute;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: -0.01em;
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.85);
    color: var(--color-text);
    border: 1px solid rgba(255, 255, 255, 0.95);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06), inset 0 1px 1px rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px) saturate(140%);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.165, 0.84, 0.44, 1);
    box-sizing: border-box;
    border-radius: 12px;
    text-decoration: none;
    pointer-events: auto;
    z-index: 10;
}

.insights-btn-icon {
    width: 16px;
    height: 16px;
    stroke: var(--color-text);
    flex-shrink: 0;
    transition: transform 0.2s ease;
}

.insights-btn:hover {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1), inset 0 1px 1px rgba(255, 255, 255, 1);
    transform: translateY(-1px);
}

.insights-btn:hover .insights-btn-icon {
    transform: translate(1px, -1px);
}

.insights-btn:active {
    transform: translateY(1px);
}

.insights-btn:focus-visible {
    outline: 2px dashed var(--color-grid);
    outline-offset: 2px;
}

.corner {
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2.5px solid transparent;
    opacity: 0.55;
    box-sizing: border-box;
    pointer-events: none;
    transition: width 0.38s cubic-bezier(0.16, 1, 0.3, 1),
                height 0.38s cubic-bezier(0.16, 1, 0.3, 1),
                opacity 0.32s cubic-bezier(0.16, 1, 0.3, 1),
                border-color 0.32s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Stationary corner-to-full-border expansion on homepage & insights hub tiles
   (Excludes #article-tile long-form reading container) */
.accent-block:not(#article-tile):hover .corner {
    width: calc(50% + 1px);
    height: calc(50% + 1px);
    opacity: 0.85;
}

/* Clickable Insights Hub article cards transition the completed frame to --color-cta */
.article-accent:not(#article-tile):hover .corner.tl {
    border-top-color: var(--color-cta);
    border-left-color: var(--color-cta);
}

.article-accent:not(#article-tile):hover .corner.tr {
    border-top-color: var(--color-cta);
    border-right-color: var(--color-cta);
}

.article-accent:not(#article-tile):hover .corner.bl {
    border-bottom-color: var(--color-cta);
    border-left-color: var(--color-cta);
}

.article-accent:not(#article-tile):hover .corner.br {
    border-bottom-color: var(--color-cta);
    border-right-color: var(--color-cta);
}

.corner.tl {
    top: -1px;
    left: -1px;
    border-top-color: var(--color-grid);
    border-left-color: var(--color-grid);
}

.corner.tr {
    top: -1px;
    right: -1px;
    border-top-color: var(--color-grid);
    border-right-color: var(--color-grid);
}

.corner.bl {
    bottom: -1px;
    left: -1px;
    border-bottom-color: var(--color-grid);
    border-left-color: var(--color-grid);
}

.corner.br {
    bottom: -1px;
    right: -1px;
    border-bottom-color: var(--color-grid);
    border-right-color: var(--color-grid);
}

/* --- Architectural Blueprint Colophon (Grid-Snapped Footer) --- */
.site-colophon {
    position: absolute;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    height: 36px;
    padding: 0 18px;
    background: rgba(248, 240, 227, 0.82);
    border-top: 1.5px solid rgba(72, 123, 195, 0.45);
    border-bottom: 1.5px solid rgba(72, 123, 195, 0.45);
    box-sizing: border-box;
    pointer-events: auto;
    z-index: 10;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text);
    user-select: none;
}

/* Architectural corner brackets on the colophon strip */
.site-colophon::before,
.site-colophon::after {
    content: '';
    position: absolute;
    top: -1.5px;
    bottom: -1.5px;
    width: 8px;
    border-top: 2px solid var(--color-grid);
    border-bottom: 2px solid var(--color-grid);
    opacity: 0.85;
    pointer-events: none;
}

.site-colophon::before {
    left: 0;
    border-left: 2px solid var(--color-grid);
}

.site-colophon::after {
    right: 0;
    border-right: 2px solid var(--color-grid);
}

.colophon-copy {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--color-grid);
    white-space: nowrap;
}

.colophon-nav {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 10px;
}

.colophon-sep {
    color: var(--color-grid);
    opacity: 0.45;
}

.colophon-link {
    color: var(--color-text);
    text-decoration: underline;
    text-decoration-color: rgba(72, 123, 195, 0.45);
    text-decoration-thickness: 1.5px;
    text-underline-offset: 3.5px;
    opacity: 0.88;
    cursor: pointer;
    transition: color 0.2s ease, text-decoration-color 0.2s ease, opacity 0.2s ease;
}

.colophon-link:hover,
.colophon-link:focus-visible {
    color: var(--color-grid);
    text-decoration-color: var(--color-grid);
    opacity: 1;
}

@media (max-width: 767px) {
    .site-colophon {
        flex-direction: column;
        justify-content: center;
        align-items: center;
        text-align: center;
        height: 54px;
        gap: 4px;
        padding: 0 12px;
        font-size: 10.5px;
    }
    .colophon-nav {
        justify-content: center;
        gap: 8px;
    }
}

/* --- Utility & Accessibility Layout Helpers --- */
/* Accessibility Elements */
.skip-link {
    position: absolute;
    top: -100px;
    left: 24px;
    background-color: var(--color-bg);
    color: var(--color-text);
    padding: 8px 16px;
    border: 1.5px solid var(--color-text);
    box-shadow: 3px 3px 0px var(--color-text);
    z-index: 10000;
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 600;
    font-size: 13px;
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: top 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.skip-link:focus-visible {
    top: 24px;
    outline: 2px dashed var(--color-grid);
    outline-offset: 4px;
}

/* Screenshot Mode for OpenGraph capture */
body.screenshot-mode #turnstile-widget {
    display: none !important;
}

/* --- Cross-Document View Transitions (MPA) --- */
@media (prefers-reduced-motion: no-preference) {
    @view-transition {
        navigation: auto;
    }

    ::view-transition-old(root) {
        animation-duration: 0.2s;
        animation-timing-function: ease-out;
    }

    ::view-transition-new(root) {
        animation-duration: 0.2s;
        animation-timing-function: ease-out;
    }
}