/* =========================================================
 * Luxe Minimal - Article Page (article.css)
 * 文章單篇樣式 - 沿用 main.css :root tokens 與 .lm-* 共用 class
 * 命名空間：.art-*
 * ========================================================= */

/* ---------- Reading Progress Bar ---------- */
.art-progress
{
    position: fixed;
    top: 0;
    left: 0;
    height: 2px;
    width: 0%;
    background: var(--brand-darker);
    z-index: 200;
    transition: width 0.1s linear;
}

/* ---------- Breadcrumb ---------- */
.art-breadcrumb
{
    background: var(--surface-card);
    border-bottom: 1px solid var(--brand-lighter);
}

.art-breadcrumb-inner
{
    max-width: 1280px;
    margin: 0 auto;
    padding: 16px 24px;
}

.art-breadcrumb ol
{
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    font-size: 12px;
    letter-spacing: 0.08em;
    color: var(--ink-muted);
    list-style: none;
    padding: 0;
    margin: 0;
}

.art-breadcrumb ol a
{
    color: var(--ink-muted);
    transition: color 0.2s;
}

.art-breadcrumb ol a:hover
{
    color: var(--brand-dark);
}

.art-breadcrumb ol li.current
{
    color: var(--ink);
    font-weight: 500;
    max-width: 60vw;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

@media (min-width: 768px)
{
    .art-breadcrumb ol li.current
    {
        max-width: none;
    }
}

.art-breadcrumb ol li[aria-hidden]
{
    color: var(--brand-light);
}

/* ---------- Accent ---------- */
.art-accent
{
    color: var(--brand-dark);
}

/* ---------- Hero ---------- */
.art-hero
{
    background: var(--surface-warm);
}

.art-hero-text
{
    max-width: 768px;
    margin: 0 auto;
    padding: 56px 24px 32px;
    text-align: center;
}

.art-hero-text h1
{
    font-family: var(--font-serif);
    font-size: 32px;
    font-weight: 700;
    line-height: 1.18;
    letter-spacing: -0.02em;
    color: var(--ink);
    margin: 20px 0 24px;
}

@media (min-width: 768px)
{
    .art-hero-text
    {
        padding: 96px 48px 48px;
    }

    .art-hero-text h1
    {
        font-size: 56px;
    }
}

.art-hero-lead
{
    color: var(--ink-light);
    font-size: 16px;
    line-height: 1.7;
    max-width: 640px;
    margin: 0 auto 32px;
}

@media (min-width: 768px)
{
    .art-hero-lead
    {
        font-size: 18px;
    }
}

.art-hero-meta
{
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    font-size: 12px;
    letter-spacing: 0.08em;
    color: var(--ink-muted);
}

.art-hero-meta [aria-hidden]
{
    color: var(--brand-light);
}

.art-hero-cover
{
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 16px 48px;
}

.art-hero-cover img
{
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    background: var(--brand-lighter);
}

@media (min-width: 768px)
{
    .art-hero-cover
    {
        padding: 0 48px 80px;
    }

    .art-hero-cover img
    {
        aspect-ratio: 21 / 9;
    }
}

/* ---------- Body / Prose ---------- */
.art-body
{
    background: #ffffff;
}

.art-body-inner
{
    max-width: 680px;
    margin: 0 auto;
    padding: 64px 24px;
}

@media (min-width: 768px)
{
    .art-body-inner
    {
        padding: 96px 32px;
    }
}

.art-prose section
{
    margin-bottom: 48px;
}

@media (min-width: 768px)
{
    .art-prose section
    {
        margin-bottom: 64px;
    }
}

.art-prose h2
{
    font-family: var(--font-serif);
    font-size: 24px;
    font-weight: 700;
    color: var(--ink);
    line-height: 1.35;
    letter-spacing: -0.01em;
    margin: 0 0 20px;
}

@media (min-width: 768px)
{
    .art-prose h2
    {
        font-size: 30px;
    }
}

.art-prose p
{
    color: #444444;
    font-size: 16px;
    line-height: 1.9;
    letter-spacing: 0.01em;
    margin: 0;
}

@media (min-width: 768px)
{
    .art-prose p
    {
        font-size: 17px;
        line-height: 1.95;
    }
}

.art-prose p + p
{
    margin-top: 1.25em;
}

.art-prose strong
{
    color: var(--ink);
    font-weight: 600;
}

/* ---------- Pull Quote ---------- */
.art-quote
{
    margin: 56px 0;
}

@media (min-width: 768px)
{
    .art-quote
    {
        margin: 80px 0;
    }
}

.art-quote blockquote
{
    position: relative;
    border-left: 2px solid var(--brand);
    padding: 8px 0 8px 24px;
    margin: 0;
}

@media (min-width: 768px)
{
    .art-quote blockquote
    {
        padding-left: 40px;
    }
}

.art-quote-mark
{
    position: absolute;
    top: -16px;
    left: -12px;
    width: 40px;
    height: 40px;
    color: var(--brand-lighter);
}

.art-quote p
{
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 20px;
    line-height: 1.6;
    color: var(--ink);
    letter-spacing: -0.01em;
    margin: 0;
}

@media (min-width: 768px)
{
    .art-quote p
    {
        font-size: 28px;
    }
}

.art-quote .art-accent
{
    font-weight: 600;
    font-style: normal;
}

/* ---------- Data Highlight Card（NTA 實測數據） ---------- */
.art-data-card
{
    margin: 56px 0;
    padding: 40px 24px;
    text-align: center;
    background: var(--surface-warm);
    border: 1px solid var(--brand-lighter);
}

@media (min-width: 768px)
{
    .art-data-card
    {
        margin: 80px 0;
        padding: 48px 40px;
    }
}

.art-data-card-eyebrow
{
    font-size: 12px;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--brand-darker);
    font-weight: 500;
    margin: 0 0 12px;
}

.art-data-card-figure
{
    font-family: var(--font-serif);
    font-size: 40px;
    font-weight: 700;
    color: var(--ink);
    letter-spacing: -0.02em;
    margin: 0 0 8px;
}

@media (min-width: 768px)
{
    .art-data-card-figure
    {
        font-size: 56px;
    }
}

.art-data-card-figure sup
{
    font-size: 0.6em;
}

.art-data-card-caption
{
    font-size: 14px;
    color: var(--ink-light);
    line-height: 1.65;
    max-width: 360px;
    margin: 0 auto;
}

/* ---------- Share ---------- */
.art-share
{
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
    justify-content: space-between;
    margin-top: 64px;
    padding-top: 40px;
    border-top: 1px solid var(--brand-lighter);
}

@media (min-width: 640px)
{
    .art-share
    {
        flex-direction: row;
        align-items: center;
    }
}

.art-share-label
{
    font-size: 12px;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--ink-muted);
    font-weight: 500;
    margin: 0;
}

.art-share-buttons
{
    display: flex;
    gap: 8px;
}

.art-share-buttons a,
.art-share-buttons button
{
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--brand-lighter);
    color: var(--ink-light);
    cursor: pointer;
    transition: all 0.2s;
}

.art-share-buttons a:hover,
.art-share-buttons button:hover,
.art-share-buttons button.copied
{
    background: var(--ink);
    color: #ffffff;
    border-color: var(--ink);
}

.art-share-buttons svg
{
    width: 16px;
    height: 16px;
}

/* ---------- CTA Banner ---------- */
.art-cta
{
    background: var(--surface-warm);
    padding: 80px 24px;
}

@media (min-width: 768px)
{
    .art-cta
    {
        padding: 112px 24px;
    }
}

.art-cta-inner
{
    max-width: 768px;
    margin: 0 auto;
    text-align: center;
}

.art-cta-inner h2
{
    font-family: var(--font-serif);
    font-size: 32px;
    font-weight: 700;
    color: var(--ink);
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin: 12px 0 24px;
}

@media (min-width: 768px)
{
    .art-cta-inner h2
    {
        font-size: 48px;
    }
}

.art-cta-inner > p
{
    color: var(--ink-light);
    font-size: 16px;
    line-height: 1.7;
    max-width: 560px;
    margin: 0 auto 40px;
}

.art-cta-buttons
{
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
    justify-content: center;
}

@media (min-width: 640px)
{
    .art-cta-buttons
    {
        flex-direction: row;
    }
}

/* ---------- Related Articles ---------- */
.art-related
{
    background: #ffffff;
    padding: 64px 24px;
    border-top: 1px solid var(--brand-lighter);
}

@media (min-width: 768px)
{
    .art-related
    {
        padding: 96px 48px;
    }
}

.art-related-inner
{
    max-width: 1280px;
    margin: 0 auto;
}

.art-related-head
{
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    margin-bottom: 40px;
}

@media (min-width: 768px)
{
    .art-related-head
    {
        margin-bottom: 56px;
    }
}

.art-related-head h3
{
    font-family: var(--font-serif);
    font-size: 24px;
    font-weight: 700;
    color: var(--ink);
    margin: 0;
}

@media (min-width: 768px)
{
    .art-related-head h3
    {
        font-size: 30px;
    }
}

.art-related-all
{
    display: none;
    font-size: 14px;
    color: var(--ink);
    font-weight: 500;
    border-bottom: 1px solid var(--ink);
    padding-bottom: 2px;
    transition: all 0.2s;
}

@media (min-width: 768px)
{
    .art-related-all
    {
        display: inline-flex;
    }
}

.art-related-all:hover
{
    color: var(--brand-dark);
    border-bottom-color: var(--brand-dark);
}

.art-related-grid
{
    display: grid;
    gap: 24px;
    grid-template-columns: 1fr;
}

@media (min-width: 768px)
{
    .art-related-grid
    {
        grid-template-columns: repeat(3, 1fr);
        gap: 32px;
    }
}

.art-related-card
{
    display: block;
    color: inherit;
}

.art-related-card-img
{
    aspect-ratio: 4 / 3;
    background: var(--brand-lighter);
    overflow: hidden;
    margin-bottom: 16px;
}

.art-related-card-img > div
{
    width: 100%;
    height: 100%;
    transition: transform 0.5s;
}

.art-related-card:hover .art-related-card-img > div
{
    transform: scale(1.05);
}

.art-related-card-tag
{
    font-size: 11px;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--brand-darker);
    font-weight: 500;
    margin: 0;
}

.art-related-card h4
{
    font-family: var(--font-serif);
    font-size: 18px;
    font-weight: 600;
    color: var(--ink);
    line-height: 1.4;
    margin: 8px 0 0;
    transition: color 0.2s;
}

@media (min-width: 768px)
{
    .art-related-card h4
    {
        font-size: 20px;
    }
}

.art-related-card:hover h4
{
    color: var(--brand-dark);
}

.art-related-card-img-grad-1
{
    background: linear-gradient(135deg, var(--brand-lighter), var(--surface-warm));
}

.art-related-card-img-grad-2
{
    background: linear-gradient(315deg, var(--brand-light), var(--brand-lighter));
}

.art-related-card-img-grad-3
{
    background: linear-gradient(45deg, var(--surface-warm), var(--brand-lighter), var(--brand-light));
}

/* ---------- fade-in (IntersectionObserver) ---------- */
.fade-in
{
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in.visible
{
    opacity: 1;
    transform: translateY(0);
}

@media (prefers-reduced-motion: reduce)
{
    .fade-in
    {
        opacity: 1;
        transform: none;
        transition: none;
    }
}