:root{color-scheme:light;--brand: #1f3b65;--brand-light: #f4f7fb;--accent: #ff7a59;--text: #1f2933}body{font-family:Segoe UI,PingFang SC,Hiragino Sans GB,Noto Sans CJK SC,Microsoft YaHei,sans-serif;color:var(--text);background:var(--brand-light)}.brand{display:flex;align-items:center;gap:.5rem;font-weight:600;color:var(--brand)}.language-switch{display:inline-flex;align-items:center;gap:.75rem}.language-switch a{color:var(--brand);text-decoration:none;font-weight:600}.language-switch a:hover{text-decoration:underline}.brand-mark{width:32px;height:32px;border-radius:50%;background:var(--brand);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-size:18px}.hero{padding:2.25rem 0 1.1rem;background:linear-gradient(180deg,#fff,#f4f7fb)}.hero .kicker{margin-bottom:.35rem;font-size:.85rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:#1f3b65c7}.hero h1,.hero .lead{margin-bottom:.35rem}.hero .subtitle{margin-bottom:0;color:#52616b}.content{margin-top:-1.5rem}.formula-count-hint{display:inline-block;margin-left:.5rem;padding:.1rem .5rem;border-radius:999px;background:#1f3b6514;color:var(--brand);font-weight:600}.card{border-radius:16px;border:1px solid rgba(31,59,101,.08)}.results-toolbar{display:flex;align-items:center;gap:.75rem;flex-wrap:wrap;margin-bottom:.75rem}.results-grid{display:flex;flex-wrap:wrap;align-items:flex-start;gap:.75rem}.result-item{position:relative;flex:1 1 260px;max-width:100%;border-radius:12px;border:1px dashed rgba(31,59,101,.22);background:#fff;padding:.75rem;cursor:pointer;-webkit-user-select:none;user-select:none;text-align:left;transition:border-color .12s ease,transform 60ms ease}.result-item:hover{border-color:#1f3b6573}.result-item:active{transform:translateY(1px)}.result-item:focus-visible{outline:3px solid rgba(31,59,101,.25);outline-offset:2px}.result-item img{display:block;width:100%;height:auto}.result-item.is-error{border-style:solid;border-color:#c8233373;background:#fff7f8;cursor:default}.result-meta{margin-top:.5rem;font-size:12px;color:#52616b;display:flex;gap:.5rem;align-items:center;justify-content:space-between}.copied-badge{position:absolute;top:10px;right:10px;padding:4px 8px;border-radius:999px;background:#1f3b65eb;color:#fff;font-size:12px;opacity:0;transform:translateY(-4px);transition:opacity .14s ease,transform .14s ease;pointer-events:none}.result-item.is-copied .copied-badge{opacity:1;transform:translateY(0)}.result,.info{margin-top:2rem}.footer{padding:1.5rem 0;margin-top:3rem;background:#fff;font-size:.9rem}.footer a{color:var(--brand)}.btn-primary{background:var(--brand);border-color:var(--brand)}.btn-primary:hover{background:#172b47;border-color:#172b47}.btn-outline-secondary{border-color:var(--brand);color:var(--brand)}.btn-outline-secondary:hover{background:var(--brand);color:#fff}.text-bg-secondary{background:var(--accent)!important}@media (max-width: 767px){.hero{padding:1.5rem 0 .75rem}.content{margin-top:0}}