:root{color-scheme:light;--ink:#14213d;--ink-soft:#4a5874;--paper:#f7f4ec;--surface:#fffdf7;--surface-strong:#fff;--line:#d9d7ce;--accent:#ed6a3a;--accent-dark:#c84f25;--mint:#dbe9df;--shadow:0 24px 70px rgba(20,33,61,.1);--radius-lg:28px;--radius-md:18px;--radius-sm:12px;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-synthesis:none}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:radial-gradient(circle at 12% 5%,rgba(237,106,58,.11),transparent 22rem),linear-gradient(180deg,#f9f6ee 0%,#f3f1ea 100%);min-height:100vh}button,input,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{color:inherit}a{color:inherit}.skip-link{position:fixed;top:1rem;left:1rem;z-index:100;padding:.75rem 1rem;background:var(--ink);color:#fff;border-radius:.5rem;transform:translateY(-180%)}.skip-link:focus{transform:translateY(0)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.site-header{width:min(1180px,calc(100% - 40px));margin:0 auto;min-height:88px;display:flex;align-items:center;justify-content:space-between;gap:1rem}.brand{display:inline-flex;align-items:center;gap:.8rem;text-decoration:none}.brand-mark{display:grid;place-items:center;width:42px;height:42px;border-radius:13px;color:#fff;background:var(--ink);font-size:1.35rem;font-weight:800}.brand strong,.brand small{display:block}.brand strong{font-size:1rem}.brand small{margin-top:.15rem;color:var(--ink-soft);font-size:.72rem}.header-actions{display:flex;align-items:center;gap:.75rem}.offline-badge,.github-link{display:inline-flex;align-items:center;gap:.45rem;min-height:38px;padding:0 .85rem;border:1px solid rgba(20,33,61,.14);border-radius:999px;font-size:.78rem;font-weight:700;text-decoration:none;background:rgba(255,255,255,.45)}.offline-badge i{width:8px;height:8px;border-radius:50%;background:#2f8b57}.github-link:hover{background:var(--ink);color:#fff}main{width:min(1180px,calc(100% - 40px));margin:0 auto}.hero{padding:clamp(3.5rem,8vw,7.5rem) 0 clamp(3rem,6vw,5rem);max-width:870px}.eyebrow,.section-kicker{margin:0 0 .9rem;color:var(--accent-dark);font-size:.76rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase}.hero h1{margin:0;font-size:clamp(3.1rem,8vw,6.75rem);line-height:.94;letter-spacing:-.065em;font-weight:850}.hero-copy{max-width:680px;margin:1.8rem 0 0;color:var(--ink-soft);font-size:clamp(1rem,2vw,1.2rem);line-height:1.8}.app-shell{display:grid;grid-template-columns:minmax(0,1fr) 320px;background:var(--surface);border:1px solid rgba(20,33,61,.12);border-radius:var(--radius-lg);box-shadow:var(--shadow);overflow:hidden;scroll-margin-top:1rem}.converter-panel{padding:clamp(1.4rem,4vw,3.2rem)}.saved-panel{display:flex;flex-direction:column;gap:2.4rem;padding:2rem;background:#172541;color:#fff}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:2rem}.section-heading h2,.aside-heading h2,.workflow h2{margin:0;letter-spacing:-.035em}.section-heading h2{font-size:clamp(1.6rem,3vw,2.2rem)}.section-heading>p{max-width:360px;margin:0;color:var(--ink-soft);font-size:.9rem;line-height:1.65}.category-list{display:flex;gap:.65rem;padding:1.8rem 0 .5rem;overflow-x:auto;scrollbar-width:thin}.category-chip{flex:0 0 auto;display:inline-flex;align-items:center;gap:.48rem;min-height:42px;padding:0 .9rem;border:1px solid var(--line);border-radius:999px;background:transparent;cursor:pointer;transition:160ms ease}.category-chip:hover{transform:translateY(-1px);border-color:var(--ink-soft)}.category-chip.is-active{border-color:var(--ink);background:var(--ink);color:#fff}.category-chip span:first-child{font-weight:800}.conversion-workspace{display:grid;grid-template-columns:minmax(0,1fr) 54px minmax(0,1fr);align-items:end;gap:1rem;margin-top:2rem}.value-column>label{display:block;margin:0 0 .55rem;font-size:.78rem;font-weight:800;color:var(--ink-soft)}.number-field{display:flex;align-items:center;min-height:86px;padding:0 1.15rem;border:1px solid var(--line);border-radius:var(--radius-md) var(--radius-md) 0 0;background:var(--surface-strong)}.number-field:focus-within{border-color:var(--accent);box-shadow:0 0 0 4px rgba(237,106,58,.12)}.number-field input{width:100%;min-width:0;border:0;outline:0;color:var(--ink);background:transparent;font-size:clamp(1.8rem,5vw,3rem);font-weight:780;letter-spacing:-.04em}.number-field span{margin-left:.7rem;color:var(--ink-soft);font-weight:800}.result-field{background:#f2f6f3}.value-column select{width:100%;min-height:52px;padding:0 1rem;border:1px solid var(--line);border-top:0;border-radius:0 0 var(--radius-md) var(--radius-md);background:#fff;color:var(--ink);outline:none;cursor:pointer}.swap-button{display:grid;place-items:center;width:54px;height:54px;margin-bottom:0;border:0;border-radius:50%;background:var(--accent);color:#fff;font-size:1.45rem;font-weight:800;cursor:pointer;box-shadow:0 10px 26px rgba(237,106,58,.24);transition:160ms ease}.swap-button:hover{transform:rotate(180deg);background:var(--accent-dark)}.status-message{min-height:1.4em;margin:.8rem 0 0;color:var(--ink-soft);font-size:.8rem}.status-message.is-error{color:#b42318}.result-card{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin-top:1.5rem;padding:1.3rem 1.4rem;border-radius:var(--radius-md);background:var(--mint)}.result-label{margin:0 0 .3rem;color:var(--ink-soft);font-size:.75rem;font-weight:800}.result-card strong{font-size:clamp(1.1rem,3vw,1.55rem);letter-spacing:-.025em}.primary-action{flex:0 0 auto;min-height:44px;padding:0 1rem;border:0;border-radius:999px;background:var(--ink);color:#fff;font-weight:750;cursor:pointer}.primary-action:hover{background:#253758}.formula-card{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-top:1rem;padding:1.25rem;border:1px dashed #c7c5bb;border-radius:var(--radius-md)}.formula-card div{display:grid;gap:.3rem}.formula-card span{color:var(--ink-soft);font-size:.72rem;font-weight:800}.formula-card strong{font-size:.92rem;line-height:1.55;overflow-wrap:anywhere}.tool-actions{display:flex;flex-wrap:wrap;gap:.7rem;margin-top:1rem}.tool-actions button{min-height:40px;padding:0 .9rem;border:1px solid var(--line);border-radius:999px;background:transparent;font-size:.82rem;font-weight:750;cursor:pointer}.tool-actions button:hover,.tool-actions button.is-active{border-color:var(--accent);color:var(--accent-dark);background:rgba(237,106,58,.08)}.aside-heading .section-kicker{color:#f1a686;margin-bottom:.45rem}.aside-heading h2{font-size:1.3rem}.empty-state{color:rgba(255,255,255,.58);font-size:.82rem;line-height:1.6}.saved-list{display:grid;gap:.65rem;margin-top:1rem}.saved-item{width:100%;padding:.85rem .9rem;border:1px solid rgba(255,255,255,.14);border-radius:var(--radius-sm);background:rgba(255,255,255,.055);color:#fff;text-align:left;cursor:pointer}.saved-item:hover{background:rgba(255,255,255,.11)}.saved-item strong,.saved-item span{display:block}.saved-item strong{font-size:.88rem}.saved-item span{margin-top:.28rem;color:rgba(255,255,255,.6);font-size:.7rem}.workflow{padding:clamp(5rem,10vw,9rem) 0}.workflow-intro{max-width:760px}.workflow h2{font-size:clamp(2.2rem,5vw,4.3rem);line-height:1.03}.workflow-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin-top:3rem}.workflow article{min-height:260px;padding:1.6rem;border:1px solid rgba(20,33,61,.13);border-radius:var(--radius-md);background:rgba(255,255,255,.48)}.workflow article>span{color:var(--accent-dark);font-size:.78rem;font-weight:850}.workflow h3{margin:4.5rem 0 .8rem;font-size:1.3rem;letter-spacing:-.025em}.workflow article p{margin:0;color:var(--ink-soft);line-height:1.7;font-size:.9rem}footer{width:min(1180px,calc(100% - 40px));margin:0 auto;padding:1.5rem 0 2.5rem;border-top:1px solid rgba(20,33,61,.13);display:flex;justify-content:space-between;gap:2rem;color:var(--ink-soft);font-size:.75rem}footer p{margin:0}.toast{position:fixed;left:50%;bottom:1.5rem;z-index:50;transform:translateX(-50%);padding:.8rem 1.1rem;border-radius:999px;color:#fff;background:var(--ink);box-shadow:0 12px 36px rgba(20,33,61,.22);font-size:.84rem;font-weight:750}@media(max-width:900px){.app-shell{grid-template-columns:1fr}.saved-panel{display:grid;grid-template-columns:1fr 1fr}.workflow-grid{grid-template-columns:1fr}.workflow article{min-height:210px}.workflow h3{margin-top:3rem}}@media(max-width:680px){.site-header,main,footer{width:min(100% - 24px,1180px)}.site-header{min-height:74px}.offline-badge{display:none}.github-link{font-size:.72rem}.hero{padding-top:4rem}.hero h1{font-size:clamp(3rem,16vw,4.8rem)}.hero-copy{line-height:1.65}.section-heading{align-items:start;flex-direction:column;gap:.6rem}.conversion-workspace{grid-template-columns:1fr;gap:.8rem}.swap-button{margin:0 auto;transform:rotate(90deg)}.swap-button:hover{transform:rotate(270deg)}.number-field{min-height:78px}.formula-card{grid-template-columns:1fr}.result-card{align-items:flex-start;flex-direction:column}.primary-action{width:100%}.saved-panel{grid-template-columns:1fr}footer{flex-direction:column;gap:.6rem}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important}}