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/* ============================================================ |
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Sticky Header — style.css |
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Prefix: bkbg-sth- |
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============================================================ */ |
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|
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.bkbg-sth-wrap { |
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box-sizing: border-box; |
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width: 100%; |
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} |
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|
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/* ---- Header base ---- */ |
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.bkbg-sth-header { |
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width: 100%; |
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background: var(--bkbg-sth-bg, #ffffff); |
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height: var(--bkbg-sth-h, 70px); |
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display: flex; |
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align-items: center; |
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transition: height .25s, box-shadow .25s, background .25s; |
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} |
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|
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/* Border bottom */ |
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.bkbg-sth-border-bottom { border-bottom: 1px solid var(--bkbg-sth-border, #e2e8f0); } |
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|
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/* Drop shadow state (added by JS on scroll) */ |
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.bkbg-sth-header.bkbg-sth-is-scrolled { |
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box-shadow: 0 2px 16px rgba(0,0,0,.08); |
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} |
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.bkbg-sth-header.bkbg-sth-is-scrolled.bkbg-sth-shrink { |
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height: var(--bkbg-sth-h-shrunk, 56px); |
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} |
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|
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/* Sticky */ |
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.bkbg-sth-sticky { |
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position: sticky; |
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top: 0; |
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z-index: var(--bkbg-sth-z, 1000); |
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} |
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|
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/* ---- Inner ---- */ |
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.bkbg-sth-inner { |
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max-width: var(--bkbg-sth-max-w, 1200px); |
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margin: 0 auto; |
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padding: 0 24px; |
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width: 100%; |
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display: flex; |
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align-items: center; |
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gap: 24px; |
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} |
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|
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/* ---- Logo ---- */ |
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.bkbg-sth-logo { |
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display: flex; |
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align-items: center; |
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gap: 8px; |
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text-decoration: none; |
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flex-shrink: 0; |
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} |
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.bkbg-sth-logo-text { |
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font-family: var(--bksth-lg-font-family, inherit); |
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font-size: var(--bksth-lg-font-size-d, var(--bkbg-sth-logo-sz, 22px)); |
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font-weight: var(--bksth-lg-font-weight, var(--bkbg-sth-logo-w, 800)); |
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font-style: var(--bksth-lg-font-style, normal); |
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text-decoration: var(--bksth-lg-text-decoration, none); |
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text-transform: var(--bksth-lg-text-transform, none); |
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line-height: var(--bksth-lg-line-height-d, var(--bkbg-sth-logo-lh, 1.0)); |
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letter-spacing: var(--bksth-lg-letter-spacing-d, -.02em); |
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word-spacing: var(--bksth-lg-word-spacing-d, normal); |
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color: var(--bkbg-sth-text, #0f172a); |
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white-space: nowrap; |
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} |
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.bkbg-sth-logo-img { |
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height: calc(var(--bkbg-sth-h, 70px) * 0.44); |
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width: auto; |
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display: block; |
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transition: height .25s; |
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object-fit: contain; |
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} |
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.bkbg-sth-is-scrolled.bkbg-sth-shrink .bkbg-sth-logo-img { |
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height: calc(var(--bkbg-sth-h-shrunk, 56px) * 0.42); |
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} |
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|
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/* ---- Nav ---- */ |
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.bkbg-sth-nav { |
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display: flex; |
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align-items: center; |
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gap: var(--bkbg-sth-link-gap, 32px); |
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flex: 1; |
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justify-content: center; |
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} |
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|
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.bkbg-sth-nav-link { |
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font-family: var(--bksth-lk-font-family, inherit); |
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font-size: var(--bksth-lk-font-size-d, var(--bkbg-sth-link-sz, 15px)); |
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font-weight: var(--bksth-lk-font-weight, var(--bkbg-sth-link-w, 500)); |
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font-style: var(--bksth-lk-font-style, normal); |
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text-decoration: var(--bksth-lk-text-decoration, none); |
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text-transform: var(--bksth-lk-text-transform, none); |
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line-height: var(--bksth-lk-line-height-d, var(--bkbg-sth-link-lh, 1.0)); |
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letter-spacing: var(--bksth-lk-letter-spacing-d, normal); |
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word-spacing: var(--bksth-lk-word-spacing-d, normal); |
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color: var(--bkbg-sth-link, #374151); |
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transition: color .14s; |
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white-space: nowrap; |
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} |
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.bkbg-sth-nav-link:hover { color: var(--bkbg-sth-link-hover, #6c3fb5); } |
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|
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/* ---- Actions ---- */ |
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.bkbg-sth-actions { |
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display: flex; |
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align-items: center; |
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gap: 12px; |
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flex-shrink: 0; |
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} |
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|
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.bkbg-sth-cta { |
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display: inline-flex; |
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align-items: center; |
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gap: 6px; |
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padding: 9px 20px; |
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background: var(--bkbg-sth-cta-bg, #6c3fb5); |
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color: var(--bkbg-sth-cta-text, #ffffff); |
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font-family: var(--bksth-ct-font-family, inherit); |
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font-size: var(--bksth-ct-font-size-d, var(--bkbg-sth-cta-sz, 14px)); |
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font-weight: var(--bksth-ct-font-weight, var(--bkbg-sth-cta-w, 600)); |
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font-style: var(--bksth-ct-font-style, normal); |
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text-decoration: var(--bksth-ct-text-decoration, none); |
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text-transform: var(--bksth-ct-text-transform, none); |
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line-height: var(--bksth-ct-line-height-d, 1.0); |
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letter-spacing: var(--bksth-ct-letter-spacing-d, normal); |
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word-spacing: var(--bksth-ct-word-spacing-d, normal); |
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border-radius: var(--bkbg-sth-cta-r, 8px); |
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white-space: nowrap; |
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transition: filter .15s, transform .15s; |
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} |
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.bkbg-sth-cta:hover { filter: brightness(1.08); transform: translateY(-1px); color: var(--bkbg-sth-cta-text, #ffffff); } |
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|
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/* ---- Hamburger ---- */ |
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.bkbg-sth-hamburger { |
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display: none; |
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flex-direction: column; |
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gap: 5px; |
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background: none; |
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border: none; |
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cursor: pointer; |
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padding: 6px; |
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border-radius: 6px; |
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} |
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.bkbg-sth-hamburger span { |
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display: block; |
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width: 22px; |
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height: 2px; |
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background: var(--bkbg-sth-link, #374151); |
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border-radius: 2px; |
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transition: transform .2s, opacity .2s; |
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} |
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.bkbg-sth-hamburger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); } |
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.bkbg-sth-hamburger[aria-expanded="true"] span:nth-child(2) { opacity: 0; } |
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.bkbg-sth-hamburger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); } |
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|
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/* ---- Mobile nav drawer ---- */ |
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.bkbg-sth-mobile-nav { |
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background: var(--bkbg-sth-bg, #ffffff); |
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border-top: 1px solid var(--bkbg-sth-border, #e2e8f0); |
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display: flex; |
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flex-direction: column; |
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padding: 16px 24px 20px; |
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gap: 4px; |
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} |
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.bkbg-sth-mobile-nav[aria-hidden="true"] { display: none; } |
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|
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.bkbg-sth-mobile-link { |
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font-size: 16px; |
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font-weight: 500; |
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color: var(--bkbg-sth-link, #374151); |
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text-decoration: none; |
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padding: 10px 0; |
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border-bottom: 1px solid var(--bkbg-sth-border, #e2e8f0); |
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} |
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.bkbg-sth-mobile-link:hover { color: var(--bkbg-sth-link-hover, #6c3fb5); } |
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|
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.bkbg-sth-mobile-cta { |
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margin-top: 12px; |
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text-align: center; |
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justify-content: center; |
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border-bottom: none; |
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padding: 12px 20px; |
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} |
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|
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/* ============================================================ |
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Style Variants |
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============================================================ */ |
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|
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/* dark */ |
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.bkbg-sth-style--dark { |
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background: var(--bkbg-sth-bg, #0f172a); |
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border-color: rgba(255,255,255,.08); |
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} |
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.bkbg-sth-style--dark .bkbg-sth-logo-text { color: #ffffff; } |
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.bkbg-sth-style--dark .bkbg-sth-nav-link { color: rgba(255,255,255,.75); } |
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.bkbg-sth-style--dark .bkbg-sth-nav-link:hover { color: #ffffff; } |
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.bkbg-sth-style--dark .bkbg-sth-hamburger span { background: rgba(255,255,255,.7); } |
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.bkbg-sth-style--dark .bkbg-sth-mobile-nav { background: #0f172a; border-top-color: rgba(255,255,255,.08); } |
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.bkbg-sth-style--dark .bkbg-sth-mobile-link { color: rgba(255,255,255,.75); border-bottom-color: rgba(255,255,255,.06); } |
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|
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/* glass */ |
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.bkbg-sth-style--glass { |
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background: rgba(255,255,255,0.75); |
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backdrop-filter: blur(16px) saturate(180%); |
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-webkit-backdrop-filter: blur(16px) saturate(180%); |
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border-bottom-color: rgba(255,255,255,.4); |
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} |
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|
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/* gradient */ |
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.bkbg-sth-style--gradient { |
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background: linear-gradient(90deg, var(--bkbg-sth-bg, #0f172a), color-mix(in srgb, var(--bkbg-sth-bg, #0f172a) 70%, var(--bkbg-sth-accent, #6c3fb5))); |
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} |
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.bkbg-sth-style--gradient .bkbg-sth-logo-text { color: #ffffff; } |
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.bkbg-sth-style--gradient .bkbg-sth-nav-link { color: rgba(255,255,255,.8); } |
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.bkbg-sth-style--gradient .bkbg-sth-nav-link:hover { color: #ffffff; } |
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|
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/* ── Responsive Typography ── */ |
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@media (max-width: 1024px) { |
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.bkbg-sth-logo-text { |
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font-size: var(--bksth-lg-font-size-t, var(--bksth-lg-font-size-d, var(--bkbg-sth-logo-sz, 22px))); |
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line-height: var(--bksth-lg-line-height-t, var(--bksth-lg-line-height-d, var(--bkbg-sth-logo-lh, 1.0))); |
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letter-spacing: var(--bksth-lg-letter-spacing-t, var(--bksth-lg-letter-spacing-d, -.02em)); |
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word-spacing: var(--bksth-lg-word-spacing-t, var(--bksth-lg-word-spacing-d, normal)); |
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} |
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.bkbg-sth-nav-link { |
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font-size: var(--bksth-lk-font-size-t, var(--bksth-lk-font-size-d, var(--bkbg-sth-link-sz, 15px))); |
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line-height: var(--bksth-lk-line-height-t, var(--bksth-lk-line-height-d, var(--bkbg-sth-link-lh, 1.0))); |
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letter-spacing: var(--bksth-lk-letter-spacing-t, var(--bksth-lk-letter-spacing-d, normal)); |
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word-spacing: var(--bksth-lk-word-spacing-t, var(--bksth-lk-word-spacing-d, normal)); |
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} |
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.bkbg-sth-cta { |
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font-size: var(--bksth-ct-font-size-t, var(--bksth-ct-font-size-d, var(--bkbg-sth-cta-sz, 14px))); |
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line-height: var(--bksth-ct-line-height-t, var(--bksth-ct-line-height-d, 1.0)); |
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letter-spacing: var(--bksth-ct-letter-spacing-t, var(--bksth-ct-letter-spacing-d, normal)); |
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word-spacing: var(--bksth-ct-word-spacing-t, var(--bksth-ct-word-spacing-d, normal)); |
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} |
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} |
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@media (max-width: 767px) { |
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.bkbg-sth-logo-text { |
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font-size: var(--bksth-lg-font-size-m, var(--bksth-lg-font-size-t, var(--bksth-lg-font-size-d, var(--bkbg-sth-logo-sz, 22px)))); |
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line-height: var(--bksth-lg-line-height-m, var(--bksth-lg-line-height-t, var(--bksth-lg-line-height-d, var(--bkbg-sth-logo-lh, 1.0)))); |
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letter-spacing: var(--bksth-lg-letter-spacing-m, var(--bksth-lg-letter-spacing-t, var(--bksth-lg-letter-spacing-d, -.02em))); |
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word-spacing: var(--bksth-lg-word-spacing-m, var(--bksth-lg-word-spacing-t, var(--bksth-lg-word-spacing-d, normal))); |
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} |
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.bkbg-sth-nav-link { |
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font-size: var(--bksth-lk-font-size-m, var(--bksth-lk-font-size-t, var(--bksth-lk-font-size-d, var(--bkbg-sth-link-sz, 15px)))); |
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line-height: var(--bksth-lk-line-height-m, var(--bksth-lk-line-height-t, var(--bksth-lk-line-height-d, var(--bkbg-sth-link-lh, 1.0)))); |
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letter-spacing: var(--bksth-lk-letter-spacing-m, var(--bksth-lk-letter-spacing-t, var(--bksth-lk-letter-spacing-d, normal))); |
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word-spacing: var(--bksth-lk-word-spacing-m, var(--bksth-lk-word-spacing-t, var(--bksth-lk-word-spacing-d, normal))); |
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} |
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.bkbg-sth-cta { |
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font-size: var(--bksth-ct-font-size-m, var(--bksth-ct-font-size-t, var(--bksth-ct-font-size-d, var(--bkbg-sth-cta-sz, 14px)))); |
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line-height: var(--bksth-ct-line-height-m, var(--bksth-ct-line-height-t, var(--bksth-ct-line-height-d, 1.0))); |
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letter-spacing: var(--bksth-ct-letter-spacing-m, var(--bksth-ct-letter-spacing-t, var(--bksth-ct-letter-spacing-d, normal))); |
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word-spacing: var(--bksth-ct-word-spacing-m, var(--bksth-ct-word-spacing-t, var(--bksth-ct-word-spacing-d, normal))); |
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} |
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} |
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|
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/* Responsive Layout */ |
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@media (max-width: 768px) { |
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.bkbg-sth-nav { display: none; } |
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.bkbg-sth-hamburger { display: flex; } |
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} |
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|
