/* =============================================
   ARTICLE-DETAIL.CSS — Single Article Page
   Industrial-Luxury · Dark-Tech · Dot Rad Plast
   Scope: .ad-* prefix
   ============================================= */

/* ══════════════════════════════════════════════
   PAGE SHELL
   ══════════════════════════════════════════════ */
.ad-page {
    padding-top: var(--header-h);
    background: var(--bg-primary);
    position: relative;
}

.ad-page::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px);
    background-size: 72px 72px;
    -webkit-mask-image: linear-gradient(180deg, transparent, #000 12%, #000 88%, transparent);
            mask-image: linear-gradient(180deg, transparent, #000 12%, #000 88%, transparent);
    pointer-events: none;
    z-index: 0;
}

.ad-page > * { position: relative; z-index: 1; }

/* ══════════════════════════════════════════════
   BREADCRUMB
   ══════════════════════════════════════════════ */
.ad-breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    font-family: var(--font-display);
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 28px;
}

.ad-breadcrumb a {
    color: var(--text-secondary);
    transition: color var(--t-fast);
}

.ad-breadcrumb a:hover { color: var(--accent); }
.ad-breadcrumb__sep { color: var(--text-muted); }
.ad-breadcrumb__current { color: var(--text-secondary); }

/* ══════════════════════════════════════════════
   ARTICLE HEADER
   ══════════════════════════════════════════════ */
.ad-header {
    padding: 56px 0 40px;
    max-width: 820px;
    margin: 0 auto;
    text-align: left;
}

.ad-category {
    display: inline-block;
    padding: 5px 14px;
    margin-bottom: 22px;
    font-family: var(--font-display);
    font-size: 0.66rem;
    font-weight: 800;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--accent);
    border: 1px solid var(--accent-border);
    border-left: 2px solid var(--accent);
    background: var(--accent-dim);
}

.ad-title {
    font-family: var(--font-display);
    font-size: clamp(1.9rem, 4.2vw, 3rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.01em;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.ad-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    font-family: var(--font-ui);
    font-size: 0.78rem;
    color: var(--text-muted);
    letter-spacing: 0.04em;
}

.ad-meta__item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.ad-meta__sep {
    width: 1px;
    height: 12px;
    background: var(--border-mid);
}

/* ══════════════════════════════════════════════
   HERO IMAGE
   ══════════════════════════════════════════════ */
.ad-hero {
    position: relative;
    width: 100%;
    max-width: var(--container);
    margin: 0 auto 48px;
    aspect-ratio: 21 / 9;
    overflow: hidden;
    border: 1px solid var(--border-subtle);
    border-top: 2px solid var(--accent);
}

.ad-hero img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* ══════════════════════════════════════════════
   ARTICLE BODY
   ══════════════════════════════════════════════ */
.ad-body {
    max-width: 760px;
    margin: 0 auto;
    padding: 0 0 64px;
    font-family: var(--font-body);
    font-size: 1.02rem;
    line-height: 1.85;
    color: var(--text-secondary);
}

.ad-body p { margin-bottom: 22px; }

.ad-body h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    margin: 40px 0 16px;
    letter-spacing: -0.01em;
}

.ad-body h3 {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 32px 0 12px;
}

.ad-body strong { color: var(--text-primary); font-weight: 700; }

.ad-body a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }

.ad-body ul,
.ad-body ol {
    margin: 0 0 22px 22px;
}

.ad-body ul li,
.ad-body ol li {
    margin-bottom: 8px;
    list-style: disc;
}

.ad-body ol li { list-style: decimal; }

.ad-body blockquote {
    margin: 28px 0;
    padding: 16px 22px;
    border-left: 3px solid var(--accent);
    background: var(--accent-dim);
    font-style: italic;
    color: var(--text-primary);
}

/* ══════════════════════════════════════════════
   POST NAVIGATION — Previous / Next
   ══════════════════════════════════════════════ */
.ad-postnav {
    max-width: var(--container);
    margin: 0 auto;
    padding: 40px 40px;
    border-top: 1px solid var(--border-subtle);
    border-bottom: 1px solid var(--border-subtle);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
}

.ad-postnav__link {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 18px 20px;
    border: 1px solid var(--border-subtle);
    transition:
        border-color var(--t-fast),
        background    var(--t-fast),
        transform     var(--t-fast);
}

.ad-postnav__link:hover {
    border-color: var(--accent-border);
    background: var(--accent-dim);
    transform: translateY(-2px);
}

.ad-postnav__link--next { text-align: right; align-items: flex-end; }

.ad-postnav__label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-display);
    font-size: 0.66rem;
    font-weight: 800;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--accent);
}

.ad-postnav__title {
    font-family: var(--font-display);
    font-size: 0.96rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
}

/* Back to articles button */
.ad-back {
    max-width: var(--container);
    margin: 0 auto;
    padding: 32px 40px 8px;
    display: flex;
    justify-content: center;
}

.ad-back__btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 26px;
    font-family: var(--font-display);
    font-size: 0.74rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent);
    border: 1px solid var(--accent-border);
    transition:
        background var(--t-fast),
        gap        var(--t-fast);
}

.ad-back__btn:hover {
    background: var(--accent-dim);
    gap: 16px;
}

/* ══════════════════════════════════════════════
   RELATED ARTICLES
   ══════════════════════════════════════════════ */
.ad-related {
    max-width: var(--container);
    margin: 0 auto;
    padding: 56px 40px 80px;
}

.ad-related__hdr {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 32px;
}

.ad-related__label {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 800;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--accent);
    opacity: 0.9;
    white-space: nowrap;
}

.ad-related__line {
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, var(--accent-border) 0%, transparent 100%);
}

.ad-related__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

/* Reuse article card styling (scoped to .ad-related) */
.ad-related .ap-card { /* shared look */ }

/* ══════════════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════════════ */
@media (max-width: 1024px) {
    .ad-related__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .ad-hero { aspect-ratio: 16 / 9; }
    .ad-postnav {
        grid-template-columns: 1fr;
        padding: 32px 28px;
    }
    .ad-postnav__link--next { text-align: left; align-items: flex-start; }
    .ad-related { padding: 48px 28px 64px; }
}

@media (max-width: 640px) {
    .ad-header { padding: 40px 0 32px; }
    .ad-hero { margin-bottom: 36px; }
    .ad-body { font-size: 0.96rem; padding: 0 0 48px; }
    .ad-related__grid { grid-template-columns: 1fr; }
    .ad-back { padding: 28px 28px 4px; }
}

@media (prefers-reduced-motion: reduce) {
    .ad-postnav__link,
    .ad-back__btn { transition: none; }
}