:root{--ink:#253d35;--muted:#79877e;--green:#285c48;--line:#e2e7dd;--paper:#f7f8f3;--white:#fff}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font:14px/1.6 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit;color:inherit}button,a{touch-action:manipulation}button{cursor:pointer;border:0;background:none}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #8aafa0;outline-offset:3px}button:disabled{opacity:.4;cursor:not-allowed}.sidebar{position:fixed;top:0;bottom:0;left:0;width:220px;padding:32px 21px;background:#fff;border-right:1px solid var(--line);display:flex;flex-direction:column;z-index:10}.brand{display:flex;align-items:center;gap:10px}.brand b{display:block;font-size:17px;letter-spacing:.6px}.brand small{font-size:9px;letter-spacing:2.5px;color:#8c9b8d}.nav-label{font-size:10px;color:#a1a99d;margin:42px 12px 15px;letter-spacing:1px}.side-nav{display:flex;flex-direction:column;gap:6px}.side-nav button{display:flex;align-items:center;gap:12px;text-align:left;padding:12px;border-radius:9px;color:#77857b;font-size:12px}.side-nav button>span{width:18px;text-align:center;font-size:17px}.side-nav button>b{font-weight:500;margin-left:auto;font-size:10px;background:#fff9;padding:0 5px;border-radius:4px}.side-nav button:hover,.side-action:hover{background:#f3f6ef}.side-nav button.active{background:#e9f0e6;color:#39694b;font-weight:650}.sidebar-separator{border-top:1px solid var(--line);margin:22px 10px 12px}.side-action{text-align:left;padding:11px 12px;font-size:12px;color:#79887b;border-radius:8px}.sidebar-note{padding:20px 16px;background:#f5f6ed;border:1px solid #e7eadf;border-radius:12px;margin-top:auto}.note-leaf{display:block;font-size:26px;color:#8caa87;margin-bottom:13px}.sidebar-note b{font-size:12px;font-weight:600}.sidebar-note p{font-size:11px;line-height:1.9;color:#8c9783}.sidebar-note>span:last-child{font-size:9px;color:#829674;border-top:1px solid #dfe6d5;padding-top:12px;display:block}.sidebar-foot{font-size:9px;color:#acb3a7;text-align:center;margin-top:20px}.page{margin-left:220px;padding:0 42px;max-width:1700px}.topbar{height:85px;display:flex;align-items:center;gap:24px;border-bottom:1px solid var(--line);font-size:11px}.breadcrumbs{color:#6f8073}.breadcrumbs span{color:#bac5b8;margin:0 12px}.grade-pill{margin-left:auto;font-size:10px;color:#6b816a;border:1px solid #dce5d6;border-radius:30px;padding:6px 12px;display:flex;align-items:center;gap:6px}.dot{width:5px;height:5px;background:#78956b;border-radius:50%}.text-button{font-size:11px;color:#62785e}.hero{display:grid;grid-template-columns:1fr 1fr;gap:45px;align-items:center;padding:44px 0 38px}.eyebrow{font-size:9px;font-weight:500;letter-spacing:2.3px;color:#899a85}.hero h1{font-size:43px;line-height:1.35;letter-spacing:1px;font-weight:600;margin:14px 0}.hero h1 span{color:#668c5b}.hero-copy>p{color:#8a9784;font-size:12px;line-height:1.9;margin-bottom:22px}.button{padding:11px 18px;border-radius:7px;display:inline-flex;align-items:center;justify-content:center;gap:30px;font-size:12px}.primary{color:#fff;background:#2e604b}.primary:hover{background:#224d3b}.hero-visual{position:relative;background:#eef2e5;border:1px solid #dce4d4;border-radius:15px;box-shadow:5px 7px 0 #e8eddf;transform:rotate(-1deg);padding:16px 20px 19px}.orbit-label{display:flex;justify-content:space-between;font-size:10px;color:#718865}.orbit-label>span{font-size:8px;letter-spacing:1px;color:#9ba991}.hero-visual svg{display:block;width:100%;height:225px}.hero-visual-bottom{display:flex;justify-content:space-between;align-items:center;padding:0 3px}.hero-visual-bottom b{font-size:12px;font-weight:500}.hero-visual-bottom p{font-size:10px;color:#96a18b;margin:5px 0 0}.circle-link{width:34px;height:34px;border-radius:50%;background:#fff9;border:1px solid #d9e2d0;display:grid;place-items:center;font-size:18px;color:#67805e}.sticker{position:absolute;top:50%;right:-15px;background:#f2dfb5;padding:9px 14px;font-size:10px;color:#948157;box-shadow:0 3px 4px #4c4c1c08;transform:rotate(7deg)}#heroFlag{transform-origin:225px 145px;animation:flagturn 20s linear infinite}@keyframes flagturn{to{transform:rotate(360deg)}}.library{border-top:1px solid var(--line);padding-top:31px;scroll-margin-top:20px}.section-heading{display:flex;justify-content:space-between;align-items:center}.section-heading h2{font-size:22px;margin:7px 0 0;font-weight:600;letter-spacing:.5px}.count{font-size:10px;color:#92a08a}.library-toolbar{display:flex;align-items:center;justify-content:space-between;margin:24px 0 20px;gap:14px}.view-tabs{display:flex;gap:4px;background:#ebefe6;border-radius:7px;padding:3px}.view-tabs button{font-size:11px;padding:7px 12px;color:#87967b;border-radius:5px}.view-tabs .active{background:#fff;box-shadow:0 1px 3px #65714c0a;color:#4e6d43}.search{display:flex;align-items:center;gap:8px;padding:7px 11px;border:1px solid #dfe5d8;background:#fcfdf9;border-radius:7px}.search>span{font-size:21px;line-height:1;color:#8fa080}.search input{background:none;border:0;outline:0;width:160px;font-size:11px}.search kbd{border:1px solid #e4e9dd;padding:0 5px;border-radius:3px;color:#a0ac94;font-size:9px}.tool-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.tool-card{background:white;border:1px solid #e0e6da;border-radius:12px;overflow:hidden;transition:transform .18s,box-shadow .18s}.tool-card:hover{transform:translateY(-3px);box-shadow:0 9px 24px #284a2910}.tool-art{height:146px;position:relative;display:block;padding-top:6px;overflow:hidden}.tool-art svg{width:100%;height:100%}.art-number{font-size:32px;font-family:Georgia,serif}.mint{background:#eaf1e5;color:#4e7c54}.blue{background:#e8eff4;color:#5b7e9a}.peach{background:#f6ece4;color:#b17a5d}.sand{background:#f4efdd;color:#9c884d}.lilac{background:#eeeaf5;color:#8d7aaa}.art-label{position:absolute;top:10px;left:14px;font-size:8px;letter-spacing:1px;opacity:.65}.favorite-button{position:absolute;right:10px;top:9px;border-radius:50%;background:#fffa;width:28px;height:28px;display:grid;place-items:center;font-size:17px;color:#7f8c76;padding:0}.favorite-button[aria-pressed=true]{color:#b48b3d;background:#fff1c9}.tool-info{padding:16px 18px 15px}.unit-label{font-size:9px;color:#95a18e}.tool-info h3{font-size:16px;margin:7px 0;font-weight:600}.tool-info p{font-size:11px;line-height:1.8;color:#8c9785;margin:0;min-height:40px}.tool-tags{display:flex;gap:7px;margin-top:12px}.tool-tags span{font-size:9px;padding:2px 6px;border-radius:4px;background:#f5f7f0;color:#8c9a80}.card-bottom{border-top:1px solid #eef1e9;margin-top:16px;padding-top:11px;display:flex;justify-content:space-between;align-items:center;font-size:10px;color:#59805a}.card-bottom>span:last-child{font-size:17px}.empty-state{text-align:center;padding:60px 20px;color:#839178}.empty-state>span{font-size:40px}.empty-state h3{font-size:18px}.empty-state p{font-size:12px;margin-bottom:20px}.guide{display:grid;grid-template-columns:1.15fr 1fr 1fr 1fr;gap:28px;border-top:1px solid var(--line);padding:36px 0 32px;margin-top:48px;scroll-margin-top:25px}.guide h2{font-size:23px;font-weight:500;line-height:1.6;margin:10px 0}.guide article>b{font:italic 20px Georgia,serif;color:#b6c0aa}.guide h3{font-size:12px;font-weight:600;margin:10px 0 8px}.guide p,.guide a{font-size:10px;line-height:1.9;color:#92a087}.guide a{color:#58794c}.site-footer{border-top:1px solid var(--line);padding:22px 0 30px;font-size:9px;display:flex;justify-content:space-between;color:#a0aa96}.toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:#2c4e3f;color:white;border-radius:8px;padding:12px 18px;font-size:12px;opacity:0;pointer-events:none;transition:.2s;z-index:100}.toast.visible{opacity:1}.skip{position:fixed;top:-60px;left:20px;background:white;padding:10px;z-index:100}.skip:focus{top:10px}[hidden]{display:none!important}
@media(min-width:1600px){.page{padding:0 65px}.hero{gap:90px}.hero h1{font-size:52px}.hero-visual svg{height:260px}.tool-art{height:175px}.tool-info p{font-size:12px}.tool-info h3{font-size:18px}}
@media(max-width:1200px){.sidebar{width:190px;padding:25px 15px}.page{margin-left:190px;padding:0 28px}.hero{gap:28px}.hero h1{font-size:36px}.hero-visual svg{height:210px}.hero-visual{padding:15px}.tool-grid{gap:14px}.tool-info{padding:14px}.tool-info h3{font-size:15px}.guide{gap:18px}.grade-pill{font-size:9px}.tool-tags{flex-wrap:wrap;gap:4px}}
@media(max-width:950px){.sidebar{position:static;width:100%;padding:16px 22px;border-bottom:1px solid var(--line);border-right:0;display:block}.sidebar .nav-label,.sidebar-separator,.side-action,.sidebar-note,.sidebar-foot{display:none}.brand{margin-bottom:16px}.side-nav{flex-direction:row;overflow:auto;gap:4px}.side-nav button{white-space:nowrap;padding:9px 12px}.side-nav button>b{display:none}.page{margin-left:0;padding:0 22px}.topbar{height:60px}.hero{padding-top:30px}.tool-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.tool-art{height:160px}.tool-info p{font-size:12px}.tool-info h3{font-size:17px}.guide{grid-template-columns:1fr 1fr}.guide>div{grid-row:span 3}.guide article{grid-column:2}.site-footer{gap:18px}.grade-pill{margin-left:auto}.topbar .text-button{display:none}}
@media(max-width:600px){.sidebar{padding:16px}.page{padding:0 16px}.brand{margin-bottom:12px}.side-nav button{font-size:11px;gap:7px;padding:8px 10px}.side-nav button>span{font-size:14px}.hero{grid-template-columns:1fr;gap:26px;padding:27px 0 34px}.hero h1{font-size:37px}.hero h1 br{display:none}.hero-copy>p br{display:none}.hero-copy>p{font-size:12px;margin:12px 0 16px}.hero-visual{margin:0 9px}.hero-visual svg{height:175px}.hero-visual-bottom{padding-bottom:0}.hero-visual-bottom p{margin-top:1px}.sticker{right:-12px;padding:7px 10px}.grade-pill{font-size:8px;padding:5px 8px}.breadcrumbs{font-size:10px}.breadcrumbs span{margin:0 6px}.topbar{gap:8px;height:50px}.section-heading h2{font-size:20px}.count{font-size:9px}.section-heading{gap:10px}.library-toolbar{flex-wrap:wrap;margin:20px 0 16px;gap:12px}.search{width:100%}.search input{width:100%;font-size:13px}.view-tabs{width:100%}.view-tabs button{flex:1}.tool-grid{gap:11px}.tool-art{height:115px}.tool-info{padding:12px}.tool-info h3{font-size:14px}.tool-info p{font-size:10px;min-height:54px}.unit-label{font-size:8px}.tool-tags span{font-size:8px}.card-bottom{font-size:10px;margin-top:12px}.tool-tags{min-height:42px;align-content:start}.guide{display:block;padding:28px 5px;margin-top:30px}.guide h2 br{display:none}.guide article{margin-top:22px}.guide p,.guide a{font-size:12px}.guide h3{font-size:14px}.guide article>b{font-size:16px}.site-footer{display:block;font-size:9px}.site-footer span{display:block;margin:5px 0}.favorite-button{height:26px;width:26px}.art-label{font-size:7px;left:10px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}#heroFlag{animation:none}.tool-card{transition:none}}
/* Keep the available tools closer to the first screen and labels readable. */
@media(min-width:951px){.topbar{height:72px}.hero{padding:27px 0 28px}.hero-visual svg{height:175px}.hero h1{font-size:38px;margin:10px 0}.hero-copy>p{margin:10px 0 17px}.hero-visual{padding:14px 19px}.library{padding-top:25px}.library-toolbar{margin:20px 0 16px}}
.tool-info p{color:#6d7d65}.unit-label{color:#77866d;font-size:10px}.tool-tags span{color:#788969}.side-nav button,.side-action{font-size:13px}.guide p{color:#75866a}.tool-info h3{font-weight:650}
@media(max-width:600px){.hero h1{font-size:34px;line-height:1.35}.hero h1 br{display:block}.tool-info p{font-size:11px}.side-nav button{font-size:12px}}