:root{--ink:#303f36;--muted:#727d72;--line:#d8ded3}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:radial-gradient(ellipse at 90% 8%,#dce5dbaa,transparent 45%),radial-gradient(ellipse at 0 70%,#eae1d477,transparent 45%),#f5f3ed;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}.wrap{width:calc(100% - 80px);max-width:1120px;margin-inline:auto}.skip{position:absolute;left:20px;top:-80px;background:white;padding:12px;z-index:10}.skip:focus{top:10px}a:focus-visible{outline:3px solid #93aa84;outline-offset:6px}.header{height:100px;display:flex;justify-content:space-between;align-items:center;gap:24px}.brand-lockup{display:inline-flex;align-items:center;gap:18px;line-height:1}.wordmark-window,.brand-chinese-window{position:relative;display:block;overflow:hidden;flex:none}.wordmark-window{width:154px;aspect-ratio:1729/269}.brand-chinese-window{width:142px;aspect-ratio:1372/197}.wordmark-window img,.brand-chinese-window img{position:absolute;height:auto;max-width:none;filter:brightness(0);opacity:.84}.wordmark-window img{width:118.450%;left:-9.832%;top:-19.702%}.brand-chinese-window img{width:149.271%;left:-25.437%;top:-201.523%}.brand-divider{width:1px;height:24px;background:#26302e;opacity:.22}.header nav{display:flex;align-items:center;gap:28px;font-size:14px;white-space:nowrap}.header nav>span{color:var(--muted)}.home{padding:11px 20px;border:1px solid white;border-radius:30px;background:#ffffff80;display:flex;gap:20px}.intro{padding:69px 0 45px}.eyebrow{font-size:12px;letter-spacing:2.7px;color:#7c897b;margin:0 0 23px}.intro-row{display:flex;justify-content:space-between;align-items:flex-end;gap:28px}h1{font-family:"Songti SC","Noto Serif CJK SC",serif;font-weight:500;font-size:44px;line-height:1.5;letter-spacing:1px;margin:0}.intro-row p{font-size:15px;line-height:1.95;color:var(--muted);margin:0 0 5px}.mobile{display:none}.tool-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.tool{display:flex;flex-direction:column;min-width:0;padding:30px 28px 23px;border:1px solid #fff;border-radius:26px;background:linear-gradient(130deg,#ffffffc2,#ffffff66);box-shadow:inset 0 1px 0 #fff,0 16px 42px #3b533609;backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);transition:transform .2s,box-shadow .2s}.tool:hover{transform:translateY(-5px);box-shadow:0 20px 40px #3b533617}.card-top{display:flex;align-items:center;justify-content:space-between;gap:8px}.number{font-size:11px;letter-spacing:1.2px;color:#7d8b7d}.card-top svg{width:30px;height:30px;stroke:#7e927c;fill:none;stroke-width:1.4;stroke-linecap:round;stroke-linejoin:round;flex:none}.tool-name{margin-top:45px}.tool h2{font-family:"Songti SC","Noto Serif CJK SC",serif;font-size:39px;font-weight:500;margin:0 0 9px;letter-spacing:3px}.tool-name>span{font-size:15px;color:#617460}.description{font-size:15px;color:#707e6d;line-height:1.95;margin:24px 0}.tags{list-style:none;padding:0;margin:0 0 35px;display:flex;flex-wrap:wrap;gap:7px}.tags li{font-size:12px;color:#697c62;border:1px solid #d9e1d3;padding:5px 9px;border-radius:20px;background:#f7faf340}.card-bottom{display:flex;align-items:center;justify-content:space-between;border-top:1px solid var(--line);padding-top:20px;margin-top:auto;font-size:15px}.arrow{border:1px solid #d7dfd0;border-radius:50%;width:34px;height:34px;display:grid;place-items:center;font-size:20px}.featured{background:linear-gradient(145deg,#607766f2,#3f594bef);border-color:#77927f;color:#fffef6;box-shadow:inset 0 1px 0 #ffffff38,0 20px 40px #3b53361a}.featured .number,.featured .tool-name>span,.featured .description{color:#e1e8d9}.featured svg{stroke:#e0e9d5}.featured .tags li{color:#eef3e6;background:#ffffff0a;border-color:#ffffff30}.featured .card-bottom{border-color:#ffffff30}.featured .arrow{border-color:#ffffff50}.bottom-note{display:flex;justify-content:space-between;gap:20px;padding:25px 3px 68px;color:#7b8676;font-size:13px;line-height:1.8}footer{display:flex;align-items:center;justify-content:space-between;gap:25px;border-top:1px solid var(--line);padding:27px 0 32px;font-size:12px;color:#7e8878}.footer-brand{font:21px Georgia,serif;letter-spacing:2px;color:#465941}footer p{margin:0}footer a{font-size:13px}@media(max-width:1050px){.intro-row{display:block}.intro-row p{margin-top:18px}.tool{padding:24px 20px}.description{font-size:14px}.description br{display:none}.number{font-size:10px;letter-spacing:.5px}.tags{gap:6px}.tags li{padding:4px 7px}}@media(max-width:760px){.wrap{width:calc(100% - 36px)}.header{height:90px}.brand-lockup{flex-direction:column;gap:7px}.brand-divider{display:none}.wordmark-window{width:135px}.brand-chinese-window{width:118px}.header nav>span{display:none}.home{padding:9px 14px;gap:12px;font-size:13px}.intro{padding:35px 6px 30px}h1{font-size:36px}.intro-row p{font-size:15px}.eyebrow{font-size:11px;letter-spacing:2px}.tool-grid{grid-template-columns:1fr;gap:18px}.tool{padding:26px}.number{font-size:12px;letter-spacing:1px}.tool-name{margin-top:25px}.tool h2{font-size:35px}.description{font-size:16px;margin:20px 0}.tags{margin-bottom:25px}.tags li{font-size:13px;padding:4px 10px}.bottom-note{flex-direction:column;gap:4px;padding-bottom:36px}footer{flex-wrap:wrap;gap:15px}footer p{order:3;width:100%}.mobile{display:block}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.tool{transition:none}}

/* V2.1: retain the original visual system; expand to four tools. */
.intro-row h1{flex:1;min-width:0}.intro-row>p{max-width:405px;flex:1}.tool-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.tool{padding:27px 22px 23px;min-height:350px}.tool h2{overflow-wrap:anywhere}.description{flex:1;overflow-wrap:anywhere}.tool-name>span{overflow-wrap:anywhere}.number{font-size:9px;letter-spacing:.7px}.card-top svg{width:27px;height:27px}.card-bottom{font-size:14px}.preview{padding:14px;border:1px solid #cbd8c6;border-radius:12px}.intro-row p{overflow-wrap:anywhere}
@media(max-width:1000px){.tool-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.tool{padding:28px;min-height:330px}.number{font-size:11px}.intro-row>p{max-width:600px}}
@media(max-width:600px){.tool-grid{grid-template-columns:1fr}.tool{min-height:300px}.intro-row h1{font-size:34px}.intro-row>p{max-width:none}.intro{padding-inline:0}}

.tool{min-height:420px}.description{flex:none}.tags{margin-bottom:32px}.intro-row>p{max-width:370px}.intro-row h1{font-size:40px}@media(max-width:600px){.intro-row h1{font-size:34px}.tool{min-height:360px}}