html{background:var(--obs-bg);color:var(--obs-text);scroll-behavior:smooth}.obs-shell{isolation:isolate;min-height:100vh;color:var(--obs-text);background-color:var(--obs-bg);background-image:linear-gradient(var(--obs-line) 1px, transparent 1px), linear-gradient(90deg, var(--obs-line) 1px, transparent 1px);background-size:32px 32px;position:relative;overflow:clip}.obs-shell:before{content:"";z-index:-2;pointer-events:none;opacity:.42;background:url(/assets/ambient-day-qingshan-v1-92p4WXzl.webp) 50%/cover no-repeat;position:fixed;inset:0}:root[data-theme=dark] .obs-shell:before{opacity:.5;background-image:url(/assets/ambient-night-golden-sand-v1-DJ9qheGG.webp)}.obs-shell:after{content:"";z-index:-1;pointer-events:none;opacity:0;background:radial-gradient(at 10%,#e4bb5b2e,#0000 26%),radial-gradient(at 90% 42%,#e4bb5b24,#0000 25%);position:fixed;inset:-12%}:root[data-theme=dark][data-motion=full] .obs-shell:after{opacity:1;animation:16s ease-in-out infinite alternate obs-golden-sand-drift}@keyframes obs-golden-sand-drift{to{filter:brightness(1.12);transform:translateY(2.4%)scale(1.03)}}.obs-ambient{z-index:-1;pointer-events:none;opacity:.42;background:radial-gradient(circle at 18% 20%, color-mix(in srgb, var(--obs-blue) 35%, transparent) 0 12%, transparent 35%), radial-gradient(circle at 78% 22%, color-mix(in srgb, var(--obs-cyan) 32%, transparent) 0 11%, transparent 34%), radial-gradient(circle at 65% 78%, color-mix(in srgb, var(--obs-mint) 30%, transparent) 0 10%, transparent 32%);filter:blur(52px);position:fixed;inset:-18vmax;transform:translate(0,0)scale(1.02)}:root[data-motion=full] .obs-ambient{animation:18s ease-in-out infinite alternate obs-ambient-drift}@keyframes obs-ambient-drift{to{transform:translate(2.5%,-1.5%)scale(1.06)}}@media (prefers-reduced-motion:reduce){.obs-shell:after{animation:none!important}}.obs-topbar{z-index:20;border-bottom:1px solid var(--obs-line);background:var(--obs-surface-strong);background:var(--obs-surface);-webkit-backdrop-filter:blur(18px)saturate(125%);backdrop-filter:blur(18px)saturate(125%);position:relative}.obs-main{z-index:1;width:min(100% - 32px,1200px);margin-inline:auto;position:relative}.obs-page-header{border-bottom:1px solid var(--obs-line);justify-content:space-between;align-items:center;gap:16px;display:flex}.obs-skip-link{z-index:1000;color:var(--obs-surface-strong);background:var(--obs-focus);transition:transform var(--obs-motion-fast) ease;border-radius:8px;padding:10px 14px;position:fixed;inset:12px auto auto 12px;transform:translateY(calc(-100% - 20px))}.obs-skip-link:focus{transform:translateY(0)}.obs-shell :where(a,button,input,select,textarea,[tabindex]):focus-visible,.obs-skip-link:focus-visible{outline:3px solid var(--obs-focus);outline-offset:3px}.obs-status-dot{background:var(--obs-mint);width:.55rem;height:.55rem;box-shadow:0 0 0 4px color-mix(in srgb, var(--obs-mint) 18%, transparent);border-radius:50%;display:inline-block}@media (width<=640px){.obs-main{width:min(100% - 20px,1200px)}}.obs-topbar.topbar{grid-template-columns:minmax(210px,auto) minmax(0,1fr) auto;align-items:center;gap:clamp(18px,3vw,44px);min-height:72px;padding:10px clamp(18px,4vw,56px);display:grid}.obs-topbar.topbar .brand{min-width:0}.obs-topbar.topbar .brand-mark{place-items:center;width:44px;height:44px;display:grid}.obs-topbar.topbar .brand-mark img{object-fit:contain;width:100%;height:100%;display:block}.obs-topbar.topbar .brand strong{color:var(--mf-ink);letter-spacing:.05em;font-size:clamp(1.35rem,2vw,1.72rem)}.obs-topbar.topbar .brand small{color:var(--mf-muted);font-family:var(--font-instrument);letter-spacing:.12em;font-size:.62rem}.obs-topbar.topbar .nav-links{justify-content:center;align-items:stretch;gap:clamp(14px,2.2vw,32px);min-width:0;display:flex}.obs-topbar.topbar .nav-links a{min-height:44px;color:var(--mf-muted);box-shadow:none;font-family:var(--font-display);letter-spacing:.04em;white-space:nowrap;transition:color var(--mf-motion-fast) ease, transform var(--mf-motion-fast) ease;background:0 0;border:0;border-radius:0;place-items:center;padding:0 2px;font-size:1.04rem;display:grid;position:relative}.obs-topbar.topbar .nav-links a:after{content:"";background:linear-gradient(90deg, transparent, var(--mf-aurora), var(--mf-cyan), transparent);opacity:0;height:2px;transition:opacity var(--mf-motion-fast) ease, transform var(--mf-motion-base) ease;position:absolute;bottom:2px;left:0;right:0;transform:scaleX(.4)}.obs-topbar.topbar .nav-links a:hover,.obs-topbar.topbar .nav-links a.is-active,.obs-topbar.topbar .nav-links a[aria-current=page]{color:var(--mf-ink);background:0 0}.obs-topbar.topbar .nav-links a:hover{transform:translateY(-1px)}.obs-topbar.topbar .nav-links a.is-active:after,.obs-topbar.topbar .nav-links a[aria-current=page]:after{opacity:1;transform:scaleX(1)}.obs-topbar.topbar .topbar-tools{justify-self:end}@media (width<=820px){.obs-topbar.topbar{grid-template-columns:minmax(0,1fr) auto;gap:8px 14px;padding:9px 12px 0}.obs-topbar.topbar .nav-links{overscroll-behavior-inline:contain;scrollbar-width:none;order:3;grid-column:1/-1;justify-content:flex-start;gap:22px;width:calc(100% + 24px);margin-inline:-12px;padding:0 14px 7px;overflow-x:auto}.obs-topbar.topbar .nav-links::-webkit-scrollbar{display:none}}@media (width<=560px){.obs-topbar.topbar{gap:7px 10px}.obs-topbar.topbar .brand{gap:.5rem}.obs-topbar.topbar .brand-mark{width:36px;height:36px}.obs-topbar.topbar .brand strong{font-size:1.1rem}.obs-topbar.topbar .brand small{display:none}.obs-topbar.topbar .topbar-tools{gap:.35rem;width:auto;max-width:none;overflow:visible}.obs-topbar.topbar .topbar-tools .theme-toggle{min-width:3.7rem;padding-inline:.45rem}.obs-topbar.topbar .topbar-action{max-width:6.8rem;padding-inline:.55rem}}