.site-header{position:sticky;top:0;z-index:50;height:var(--header-height);border-bottom:1px solid rgba(226,232,240,.8);background:rgba(247,248,252,.84);backdrop-filter:blur(16px)}.header-inner{height:100%;display:flex;align-items:center;justify-content:space-between}.main-nav{display:flex;align-items:center;gap:1.3rem}.main-nav>a{font-size:.92rem;color:var(--text-soft);font-weight:700}.main-nav>a:hover{color:var(--brand)}.menu-button{display:none;border:0;background:transparent}.menu-button span{display:block;width:20px;height:2px;background:currentColor;margin:3px}.language-menu{position:relative}.language-trigger{border:1px solid var(--border);background:var(--surface);border-radius:.75rem;padding:.55rem .75rem;font-weight:750}.language-popover{position:absolute;right:0;top:calc(100% + .6rem);display:none;min-width:180px;padding:.45rem;background:var(--surface);border:1px solid var(--border);border-radius:.9rem;box-shadow:var(--shadow-md)}.language-popover.is-open{display:grid}.language-popover a{padding:.65rem .75rem;border-radius:.6rem}.language-popover a:hover{background:var(--surface-muted)}
.site-footer{padding:4.5rem 0 1.5rem;background:var(--surface-dark);color:#e5e7eb}.footer-grid{display:grid;grid-template-columns:1.5fr repeat(3,1fr);gap:2.5rem}.footer-grid>div{display:flex;flex-direction:column;align-items:flex-start;gap:.55rem}.footer-grid h2{font-size:.85rem;letter-spacing:.08em;text-transform:uppercase;color:#fff}.footer-grid p,.footer-grid a{color:#9ca3af;font-size:.9rem}.footer-grid a:hover{color:#fff}.footer-brand strong{color:#fff}.footer-private{color:#67e8f9!important}.footer-bottom{display:flex;justify-content:space-between;gap:1rem;margin-top:3rem;padding-top:1.2rem;border-top:1px solid rgba(255,255,255,.1);color:#94a3b8;font-size:.8rem}
.tool-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem}.content-grid{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(280px,.75fr);gap:3rem}.tool-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:1.5rem;align-items:start}.related{display:grid;gap:.75rem}.related h2{margin-top:0}.related-card{position:relative;display:flex;flex-direction:column;padding:1rem 2.4rem 1rem 1rem;background:var(--surface);border:1px solid var(--border);border-radius:.9rem}.related-card span{font-weight:800}.related-card small{color:var(--text-soft);margin-top:.2rem}.related-card b{position:absolute;right:1rem;top:50%;transform:translateY(-50%);color:var(--brand)}.prose{font-size:1.04rem}.prose h2{margin-top:2rem}.prose p{color:var(--text-soft)}
@media(max-width:900px){.tool-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.tool-layout,.content-grid{grid-template-columns:1fr}.tool-side{display:grid;grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:repeat(2,1fr)}.main-nav{position:fixed;inset:var(--header-height) 1rem auto;display:none;flex-direction:column;align-items:stretch;padding:1rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-md)}.main-nav.is-open{display:flex}.menu-button{display:block}.language-popover{position:static;box-shadow:none;margin-top:.5rem}}
@media(max-width:640px){.container{width:min(calc(100% - 1.25rem),var(--container))}.section-heading{align-items:stretch;flex-direction:column}.tool-grid{grid-template-columns:1fr}.field-row{flex-direction:column;align-items:stretch}.swap-button{align-self:center;transform:rotate(90deg)}.form-actions{flex-direction:column}.tool-side{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}.footer-bottom{flex-direction:column}.brand small{display:none}.metric-grid{grid-template-columns:1fr}}

.language-trigger{display:inline-flex;align-items:center;gap:.45rem}.language-popover a{display:grid;grid-template-columns:2.4rem 1fr;align-items:center;gap:.35rem}.language-popover a strong{color:var(--brand);font-size:.75rem;letter-spacing:.06em}.language-popover a span{color:var(--text-soft)}.footer-private{display:inline-flex;align-items:center;gap:.4rem}.menu-button .icon{width:1.35rem;height:1.35rem}