/* yinke — 印刻制证 · Editorial letterpress
   Ink #18181B + Vermillion #B91C1C on paper #F7F4EF
   Distinct: split photo hero, overlay catalog, cover about, masonry, no process/testi */

:root {
    --yk-ink: #18181B;
    --yk-ink-2: #3F3F46;
    --yk-red: #B91C1C;
    --yk-red-h: #991B1B;
    --yk-paper: #F7F4EF;
    --yk-card: #FFFcf7;
    --yk-line: #E4E0D8;
    --yk-muted: #57534E;
    --yk-serif: Georgia, "Songti SC", "Noto Serif SC", "Times New Roman", serif;
    --yk-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
    --yk-t: .22s ease;
    --yk-z-nav: 40;
    --yk-z-lb: 70;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}
body { font-family: var(--yk-sans); font-size: 16px; line-height: 1.7; color: var(--yk-ink); background: var(--yk-paper); overflow-x: hidden; }
a { color: inherit; text-decoration: none; cursor: pointer; transition: color var(--yk-t), background var(--yk-t), border-color var(--yk-t); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; }
h1, h2, h3, h4 { font-family: var(--yk-serif); line-height: 1.22; }
:focus-visible { outline: 2px solid var(--yk-red); outline-offset: 3px; }

.yk-container { width: 100%; max-width: 1140px; margin: 0 auto; padding: 0 24px; }

.yk-nav {
    position: sticky; top: 0; z-index: var(--yk-z-nav);
    background: rgba(247, 244, 239, .94); backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--yk-line);
}
.yk-nav.scrolled { box-shadow: 0 4px 18px rgba(24, 24, 27, .06); }
.yk-nav-inner { position: relative; max-width: 1140px; margin: 0 auto; padding: 10px 24px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.yk-logo { display: inline-flex; align-items: center; gap: 10px; min-height: 44px; font-family: var(--yk-serif); font-weight: 700; font-size: 1.12rem; }
.yk-mark { width: 36px; height: 36px; background: var(--yk-ink); color: #fff; display: flex; align-items: center; justify-content: center; font-family: var(--yk-serif); font-size: 1.05rem; flex-shrink: 0; }
.yk-nav-links { display: flex; gap: 6px; }
.yk-nav-links a { display: inline-flex; align-items: center; min-height: 44px; padding: 8px 12px; color: var(--yk-ink-2); font-size: .92rem; }
.yk-nav-links a:hover { color: var(--yk-red); }
.yk-nav-cta { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 8px 18px; background: var(--yk-red); color: #fff; font-weight: 600; font-size: .88rem; }
.yk-nav-cta:hover { background: var(--yk-red-h); }
.yk-mobile-btn { display: none; width: 44px; height: 44px; border: 0; background: none; color: var(--yk-ink); }

.yk-hero { padding: 56px 0 40px; }
.yk-hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.yk-kicker { font-size: .78rem; letter-spacing: .16em; text-transform: uppercase; color: var(--yk-red); font-weight: 700; margin-bottom: 12px; }
.yk-hero h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); margin-bottom: 16px; }
.yk-hero h1 span { display: block; margin-top: 10px; font-size: .42em; letter-spacing: .12em; color: var(--yk-muted); font-weight: 500; }
.yk-lede { color: var(--yk-ink-2); max-width: 440px; margin-bottom: 28px; }
.yk-hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.yk-btn-red, .yk-btn-ink {
    display: inline-flex; align-items: center; justify-content: center;
    min-height: 48px; padding: 12px 24px; font-weight: 700;
}
.yk-btn-red { background: var(--yk-red); color: #fff; }
.yk-btn-red:hover { background: var(--yk-red-h); }
.yk-btn-ink { border: 1px solid var(--yk-ink); }
.yk-btn-ink:hover { background: var(--yk-ink); color: #fff; }
.yk-hero-stack { display: grid; gap: 12px; }
.yk-hero-stack img { width: 100%; height: 190px; object-fit: cover; filter: grayscale(.15); }

.yk-section { padding: 80px 0; }
.yk-section-tint { background: #EFEBE3; }
.yk-head { margin-bottom: 36px; }
.yk-head h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); }

.yk-catalog { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.yk-cat { display: grid; grid-template-columns: 1.1fr .9fr; min-height: 180px; background: var(--yk-card); border: 1px solid var(--yk-line); overflow: hidden; }
.yk-cat img { width: 100%; height: 100%; object-fit: cover; min-height: 180px; }
.yk-cat div { padding: 22px 20px; }
.yk-cat em { display: block; font-family: var(--yk-serif); font-style: normal; color: var(--yk-red); font-size: 1.2rem; }
.yk-cat h3 { font-size: 1.2rem; margin: 6px 0 8px; }
.yk-cat p { font-size: .86rem; color: var(--yk-muted); }
.yk-cat:hover { border-color: var(--yk-ink); }

.yk-cover { position: relative; min-height: 420px; display: grid; }
.yk-cover img { width: 100%; height: 420px; object-fit: cover; filter: grayscale(.4); }
.yk-cover-copy {
    position: absolute; inset: auto 8% 40px auto; max-width: 420px;
    background: var(--yk-ink); color: #E4E4E7; padding: 36px 32px;
}
.yk-cover-copy h2 { color: #fff; margin-bottom: 12px; }
.yk-cover-copy p { margin-bottom: 18px; color: #A1A1AA; }
.yk-cover-copy .yk-kicker { color: #FECACA; }

.yk-masonry { display: grid; grid-template-columns: repeat(4, 1fr); grid-auto-rows: 140px; gap: 10px; }
.yk-masonry-item { overflow: hidden; cursor: pointer; border: 1px solid var(--yk-line); }
.yk-masonry-item img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.yk-masonry-item:hover img { transform: scale(1.06); }
.yk-masonry-item.tall { grid-row: span 2; }
.yk-masonry-item.wide { grid-column: span 2; }

.yk-faq-item { border-bottom: 1px solid var(--yk-line); }
.yk-faq-q { width: 100%; display: flex; align-items: center; gap: 16px; min-height: 60px; padding: 14px 0; background: none; border: 0; text-align: left; font-size: 1rem; font-weight: 600; }
.yk-faq-q span { font-family: var(--yk-serif); color: var(--yk-red); min-width: 28px; }
.yk-faq-a { max-height: 0; overflow: hidden; padding: 0 0 0 44px; color: var(--yk-ink-2); font-size: .92rem; transition: max-height .28s, padding .28s; }
.yk-faq-item.active .yk-faq-a { max-height: 200px; padding: 0 0 16px 44px; }

.yk-chips { display: flex; flex-wrap: wrap; gap: 10px; }
.yk-chips a { display: inline-flex; align-items: center; min-height: 40px; padding: 8px 16px; border: 1px solid var(--yk-line); background: var(--yk-card); font-size: .86rem; }
.yk-chips a:hover { border-color: var(--yk-red); color: var(--yk-red); }
.yk-more { margin-top: 16px; }
.yk-more a { color: var(--yk-red); font-weight: 700; }

.yk-cta { background: var(--yk-ink); color: #fff; padding: 40px 0; }
.yk-cta-row { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.yk-cta h2 { color: #fff; font-size: clamp(1.3rem, 3vw, 1.8rem); }

.yk-footer { background: #111113; color: #A1A1AA; padding: 48px 0 0; }
.yk-logo-light { color: #fff; margin-bottom: 12px; }
.yk-logo-light .yk-mark { background: var(--yk-red); color: #fff; }
.yk-footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 32px; padding-bottom: 28px; border-bottom: 1px solid rgba(255,255,255,.08); }
.yk-footer h4 { color: #fff; font-size: .88rem; margin-bottom: 12px; }
.yk-footer p { font-size: .86rem; max-width: 360px; }
.yk-footer a { display: inline-flex; align-items: center; min-height: 36px; font-size: .86rem; color: #A1A1AA; }
.yk-footer a:hover { color: #FECACA; }
.yk-footer-base { padding: 16px 0; display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-size: .76rem; }

.yk-page-hero { padding: 48px 0 28px; border-bottom: 1px solid var(--yk-line); }
.yk-page-hero h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); margin-bottom: 8px; }
.yk-page-hero p { color: var(--yk-muted); }

.yk-about-block { display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; align-items: center; }
.yk-about-block img { width: 100%; height: 340px; object-fit: cover; }
.yk-about-block p { color: var(--yk-ink-2); margin-bottom: 12px; }
.yk-facts { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 24px; }
.yk-facts div { border-top: 2px solid var(--yk-red); padding-top: 10px; }
.yk-facts strong { display: block; font-family: var(--yk-serif); font-size: 1.5rem; }
.yk-facts span { font-size: .82rem; color: var(--yk-muted); }

.yk-svc-list { display: grid; gap: 20px; }
.yk-svc-row { display: grid; grid-template-columns: .9fr 1.1fr; gap: 28px; align-items: center; background: var(--yk-card); border: 1px solid var(--yk-line); }
.yk-svc-row:nth-child(even) { grid-template-columns: 1.1fr .9fr; }
.yk-svc-row:nth-child(even) img { order: 2; }
.yk-svc-row img { width: 100%; height: 220px; object-fit: cover; }
.yk-svc-row div { padding: 24px 28px; }
.yk-svc-row em { font-family: var(--yk-serif); font-style: normal; color: var(--yk-red); }
.yk-svc-row h2 { font-size: 1.35rem; margin: 6px 0 10px; }
.yk-svc-row p { color: var(--yk-ink-2); font-size: .92rem; }

.yk-empty { min-height: 56vh; display: flex; align-items: center; text-align: center; padding: 80px 0; }
.yk-empty-inner { width: 100%; }
.yk-empty strong { display: block; font-family: var(--yk-serif); font-size: 6rem; color: var(--yk-line); line-height: 1; }
.yk-empty h1 { margin: 8px 0 12px; }
.yk-empty p { color: var(--yk-muted); margin-bottom: 24px; }

.yk-lightbox { display: none; position: fixed; inset: 0; z-index: var(--yk-z-lb); background: rgba(24,24,27,.86); align-items: center; justify-content: center; padding: 32px; cursor: zoom-out; }
.yk-lightbox.active { display: flex; }
.yk-lightbox img { max-width: 90%; max-height: 88vh; object-fit: contain; }
.yk-lightbox-close { position: absolute; top: 16px; right: 16px; width: 44px; height: 44px; border: 0; border-radius: 50%; background: rgba(255,255,255,.12); color: #fff; font-size: 1.6rem; }

@media (max-width: 1024px) {
    .yk-hero-grid, .yk-catalog, .yk-about-block, .yk-cta-row, .yk-footer-grid,
    .yk-svc-row, .yk-svc-row:nth-child(even) { grid-template-columns: 1fr; }
    .yk-svc-row:nth-child(even) img { order: 0; }
    .yk-cat { grid-template-columns: 1fr .9fr; }
    .yk-masonry { grid-template-columns: repeat(2, 1fr); grid-auto-rows: 120px; }
    .yk-cover-copy { position: relative; inset: auto; max-width: none; }
    .yk-cover img { height: 260px; }
}
@media (max-width: 768px) {
    .yk-nav-links { display: none; position: absolute; top: 100%; left: 12px; right: 12px; flex-direction: column; background: var(--yk-card); border: 1px solid var(--yk-line); padding: 8px; }
    .yk-nav-links.active { display: flex; }
    .yk-nav-cta { display: none; }
    .yk-mobile-btn { display: inline-flex; align-items: center; justify-content: center; }
    .yk-hero-actions { flex-direction: column; }
    .yk-btn-red, .yk-btn-ink { width: 100%; }
    .yk-cat { grid-template-columns: 1fr; }
    .yk-section { padding: 56px 0; }
    .yk-faq-a, .yk-faq-item.active .yk-faq-a { padding-left: 0; }
}
@media (max-width: 480px) {
    .yk-container, .yk-nav-inner { padding-left: 16px; padding-right: 16px; }
    .yk-masonry { grid-template-columns: 1fr 1fr; }
}