:root{--bg:#f5f7fb;--card:#ffffff;--card-soft:#fcfdff;--text:#1f2937;--muted:#6b7280;--line:#e5e7eb;--blue:#2563eb;--soft:#eff6ff;--soft-2:#eef2ff;--chip:#ffffff;--shadow:0 10px 24px rgba(15,23,42,.05)}
    html[data-theme='dark']{--bg:#0f172a;--card:#111827;--card-soft:#0b1220;--text:#e5e7eb;--muted:#94a3b8;--line:#334155;--blue:#60a5fa;--soft:#172554;--soft-2:#1e293b;--chip:#111827;--shadow:0 10px 30px rgba(2,6,23,.45)}
    *{box-sizing:border-box} html{scroll-behavior:smooth}
    body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'PingFang SC','Noto Sans SC',sans-serif}
    a{text-decoration:none;color:inherit}.wrap{max-width:1280px;margin:0 auto;padding:20px}
    .top{display:flex;justify-content:space-between;align-items:center;gap:18px;padding-bottom:18px}.top-actions{display:flex;align-items:center;gap:10px}.menu-toggle{display:none;align-items:center;justify-content:center;border:1px solid var(--line);background:var(--card);color:var(--text);padding:10px 12px;border-radius:14px;cursor:pointer;font-size:18px;font-weight:700;box-shadow:var(--shadow)}
    .brand{display:flex;align-items:center;gap:12px}.logo{width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,#2563eb,#60a5fa);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;box-shadow:var(--shadow)}.theme-toggle{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);background:var(--card);color:var(--text);padding:10px 14px;border-radius:14px;cursor:pointer;font-size:14px;font-weight:700;box-shadow:var(--shadow)}.theme-toggle:hover,.menu-toggle:hover,.footer-link-btn:hover{color:var(--blue)}.theme-toggle:hover,.menu-toggle:hover{border-color:#93c5fd}.theme-toggle:focus-visible,.menu-toggle:focus-visible,.footer-link-btn:focus-visible,.share-link:focus-visible,.modal-tab:focus-visible,.modal-close:focus-visible,.tool-modal-actions a:focus-visible,.tool-modal-actions button:focus-visible,.feedback-actions a:focus-visible,.feedback-actions button:focus-visible,.clear-btn:focus-visible{outline:3px solid rgba(37,99,235,.18);outline-offset:2px}
    .brand h1{font-size:26px;margin:0}.brand p{margin:4px 0 0;color:var(--muted);font-size:13px}
    .global-search{margin-bottom:18px;padding:16px 18px;background:var(--card);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow)}
    .global-search-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px}.global-search-top strong{font-size:15px}.global-search-top span{font-size:12px;color:var(--muted)}
    .search-shell{position:relative}.search-shell input{width:100%;padding:15px 52px 15px 16px;border:1px solid var(--line);border-radius:14px;background:var(--card);color:var(--text);font-size:15px;outline:none}.search-shell input:focus{border-color:#93c5fd;box-shadow:0 0 0 4px rgba(37,99,235,.08)}
    .clear-btn{position:absolute;right:10px;top:50%;transform:translateY(-50%);width:34px;height:34px;border:0;border-radius:10px;background:var(--soft-2);color:var(--blue);font-size:18px;cursor:pointer;display:none}.clear-btn.show{display:block}
    .search-hint{margin-top:10px;color:var(--muted);font-size:12px;line-height:1.6}
    .hero{background:linear-gradient(180deg,var(--card),color-mix(in srgb,var(--card) 86%, var(--soft) 14%));border:1px solid var(--line);border-radius:24px;padding:22px;box-shadow:var(--shadow)}
    .hero h2{margin:0 0 8px;font-size:34px}.hero p{margin:0;color:var(--muted);line-height:1.8;max-width:860px}
    .hero-tips{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}.hero-tip{padding:8px 12px;border-radius:999px;background:var(--chip);border:1px solid var(--line);font-size:13px;color:var(--muted)}.quick-links{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px;margin-top:16px}.quick-link{display:block;padding:14px 16px;border:1px solid var(--line);border-radius:16px;background:var(--card);font-size:14px;font-weight:700;color:var(--text)}.quick-link small{display:block;margin-top:4px;color:var(--muted);font-size:12px;font-weight:500}.recent-tools{margin-top:18px;padding:16px 18px;border:1px solid var(--line);border-radius:18px;background:var(--card)}.recent-tools[hidden]{display:none!important}.recent-tools-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}.recent-tools-title{display:flex;flex-direction:column;gap:4px}.recent-tools-title strong{font-size:15px}.recent-tools-title span{font-size:12px;color:var(--muted)}.recent-tools-clear{border:1px solid var(--line);background:var(--card);color:var(--muted);padding:8px 12px;border-radius:12px;cursor:pointer;font-size:12px;font-weight:700}.recent-tools-clear:hover{color:var(--blue);border-color:#93c5fd}.recent-tools-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:10px}.recent-tool{display:flex;align-items:flex-start;gap:12px;padding:12px 14px;border:1px solid var(--line);border-radius:14px;background:var(--card-soft)}.recent-tool .tool-icon{width:40px;height:40px;border-radius:12px;display:flex;align-items:center;justify-content:center;flex:0 0 40px;font-size:12px;font-weight:800;letter-spacing:.5px}.recent-tool-body{min-width:0}.recent-tool strong{display:block;font-size:14px;color:var(--text)}.recent-tool span{display:block;margin-top:4px;font-size:12px;color:var(--muted);line-height:1.5}
    .layout{display:grid;grid-template-columns:260px 1fr;gap:18px;margin-top:22px;align-items:start}
    .sidebar{position:sticky;top:16px;background:var(--card);border:1px solid var(--line);border-radius:20px;padding:14px;box-shadow:var(--shadow)}.sidebar-mask{display:none}
    .side-title{font-size:14px;color:var(--muted);margin-bottom:10px}
    .side-link{display:flex;align-items:center;gap:10px;padding:11px 12px;border-radius:14px;color:var(--text);margin-bottom:6px}
    .side-link:hover,.side-link.active{background:#eff6ff;color:#1d4ed8}.side-link span{flex:1;font-size:14px;font-weight:600}.side-link small{color:#64748b;font-size:12px}
    .content{display:grid;gap:18px}.group{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:18px;box-shadow:var(--shadow)}.group.sticky-group{position:static}
    .group-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}.group-head h2{margin:0;font-size:22px}.group-head span{color:var(--muted);font-size:13px}
    .cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:12px}
    .tool-card{position:relative;display:flex;gap:12px;align-items:flex-start;padding:14px;border:1px solid var(--line);border-radius:16px;background:var(--card-soft);transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease,background .18s ease}.tool-card:hover{transform:translateY(-4px) scale(1.01);border-color:#93c5fd;box-shadow:0 16px 34px rgba(37,99,235,.12);background:color-mix(in srgb,var(--card-soft) 84%, var(--soft) 16%)}.tool-card.flash{animation:cardFlash 1.8s ease}.share-link{position:absolute;right:10px;top:10px;width:32px;height:32px;border-radius:10px;border:1px solid var(--line);background:var(--card);color:var(--blue);display:inline-flex;align-items:center;justify-content:center;font-size:15px;opacity:.92}.share-link:hover{border-color:#93c5fd;background:var(--soft)}@keyframes cardFlash{0%{box-shadow:0 0 0 0 rgba(37,99,235,.0);border-color:var(--line)}20%{box-shadow:0 0 0 4px rgba(37,99,235,.15);border-color:#60a5fa;background:color-mix(in srgb,var(--card-soft) 78%, #dbeafe 22%)}100%{box-shadow:0 0 0 0 rgba(37,99,235,0);border-color:var(--line)}}
    .tool-card:hover{border-color:#c7d2fe;transform:translateY(-1px)}.tool-icon{width:40px;height:40px;border-radius:12px;display:flex;align-items:center;justify-content:center;flex:0 0 40px;font-size:12px;font-weight:800;letter-spacing:.5px;color:#1e293b}.tool-icon.i1{background:#dbeafe;color:#1d4ed8}.tool-icon.i2{background:#dcfce7;color:#166534}.tool-icon.i3{background:#fef3c7;color:#92400e}.tool-icon.i4{background:#fae8ff;color:#86198f}.tool-icon.i5{background:#fee2e2;color:#b91c1c}.tool-icon.i6{background:#e0f2fe;color:#075985}.tool-icon.i7{background:#ede9fe;color:#6d28d9}.tool-icon.i8{background:#ccfbf1;color:#115e59}
    .tool-body{padding-right:38px}.tool-body b{display:block;font-size:15px;margin-bottom:4px}.tool-body small{display:block;color:var(--muted);line-height:1.55;font-size:12px}.tool-meta{display:inline-flex;align-items:center;gap:6px;margin-top:8px;padding:6px 9px;border-radius:999px;background:var(--soft);color:var(--blue);font-size:11px;font-weight:700}.usage-badge{display:inline-flex;align-items:center;gap:4px;margin-left:6px;padding:5px 8px;border-radius:999px;background:var(--soft-2);color:var(--muted);font-size:10px;font-weight:700}
    .footer{padding:28px 0 36px;color:var(--muted);font-size:14px}.links{display:flex;gap:14px;flex-wrap:wrap;margin-top:10px}.footer-link-btn{border:0;background:transparent;color:inherit;padding:0;cursor:pointer;font:inherit}.modal-backdrop{position:fixed;inset:0;background:rgba(15,23,42,.55);display:none;align-items:center;justify-content:center;padding:20px;z-index:50}.modal-backdrop.show{display:flex}body.modal-open{overflow:hidden}.modal{width:min(760px,100%);max-height:88vh;overflow:auto;background:var(--card);border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow)}.modal-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:18px 20px;border-bottom:1px solid var(--line)}.modal-head h3{margin:0;font-size:22px}.modal-close{width:38px;height:38px;border:0;border-radius:12px;background:var(--soft-2);color:var(--text);cursor:pointer;font-size:18px}.modal-tabs{display:flex;gap:8px;flex-wrap:wrap;padding:16px 20px 0}.modal-tab{border:1px solid var(--line);background:var(--card);color:var(--text);padding:9px 12px;border-radius:999px;cursor:pointer;font-size:13px;font-weight:700}.modal-tab.active{background:var(--soft);color:var(--blue);border-color:#93c5fd}.modal-body{padding:18px 20px 22px}.modal-panel{display:none}.modal-panel.active{display:block}.modal-panel p,.modal-panel li{color:var(--muted);line-height:1.8}.modal-panel ul{padding-left:20px}.timeline{display:grid;gap:14px}.timeline-item{padding:14px 16px;border:1px solid var(--line);border-radius:16px;background:var(--card-soft)}.timeline-item strong{display:block;margin-bottom:6px;color:var(--text)}.feedback-box{display:grid;gap:12px}.feedback-box textarea{width:100%;min-height:140px;padding:14px;border:1px solid var(--line);border-radius:14px;background:var(--card);color:var(--text);font-size:14px}.feedback-actions{display:flex;gap:10px;flex-wrap:wrap}.feedback-actions a,.feedback-actions button{display:inline-flex;align-items:center;justify-content:center;padding:10px 14px;border-radius:12px;border:1px solid var(--line);background:var(--card);color:var(--text);font-size:14px;font-weight:700;cursor:pointer}.tool-modal-backdrop{position:fixed;inset:0;background:rgba(2,6,23,.68);display:none;align-items:center;justify-content:center;padding:14px;z-index:60}.tool-modal-backdrop.show{display:flex}.tool-modal{width:min(1220px,100%);height:min(90vh,100%);background:var(--card);border:1px solid var(--line);border-radius:24px;overflow:hidden;box-shadow:var(--shadow);display:grid;grid-template-rows:auto 1fr}.tool-modal-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 16px;border-bottom:1px solid var(--line)}.tool-modal-title{font-size:18px;font-weight:800}.tool-modal-actions{display:flex;gap:10px;align-items:center}.tool-modal-actions a,.tool-modal-actions button{display:inline-flex;align-items:center;justify-content:center;padding:10px 12px;border-radius:12px;border:1px solid var(--line);background:var(--card);color:var(--text);font-size:13px;font-weight:700;cursor:pointer}.tool-modal-frame{width:100%;height:100%;border:0;background:#fff}
    @media (max-width:900px){.layout{grid-template-columns:1fr}.sidebar{position:static}.hero h2{font-size:28px}}@media (max-width:640px){.wrap{padding:14px}.top{padding-bottom:14px;align-items:flex-start}.top-actions{width:100%;justify-content:flex-end}.brand h1{font-size:22px}.global-search{padding:14px}.global-search-top{align-items:flex-start;flex-direction:column;gap:6px}.hero{padding:18px;border-radius:18px}.hero h2{font-size:24px}.quick-links{grid-template-columns:1fr 1fr}.side-link{padding:10px 12px}.search-shell input{padding-right:48px}.theme-toggle{padding:9px 12px}.group.sticky-group{position:static}.menu-toggle{display:inline-flex}.layout{grid-template-columns:1fr}.sidebar{position:fixed;left:0;top:0;bottom:0;width:min(86vw,320px);z-index:40;border-radius:0 20px 20px 0;transform:translateX(-110%);transition:transform .22s ease;overflow:auto}.sidebar.open{transform:translateX(0)}.sidebar-mask{position:fixed;inset:0;background:rgba(15,23,42,.48);z-index:39;display:none}.sidebar-mask.show{display:block}}