@charset "UTF-8";
:root{color-scheme:light;--paper:#f7f7ef;--white:#fffefa;--ink:#243f35;--green:#254c3e;--muted:#68766a;--line:#dfe4d7;--sage:#e7eddc;--gold:#c7a466;--radius:22px}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--paper);color:var(--ink);font-family:"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;-webkit-font-smoothing:antialiased;line-height:1.7}a{color:inherit;text-decoration:none}button,a,summary{-webkit-tap-highlight-color:transparent}a:focus-visible,summary:focus-visible{outline:3px solid #a57329;outline-offset:6px;border-radius:4px}svg{display:block}img{max-width:100%;display:block}h1,h2,h3,p,figure{margin:0}h1,h2,h3{font-weight:600}h1,h2{letter-spacing:-.04em}ol{list-style:none;margin:0;padding:0}.wrap{width:min(1160px,calc(100% - 96px));margin-inline:auto}.skip-link{position:fixed;z-index:10;left:16px;top:12px;background:var(--green);color:white;padding:10px 18px;transform:translateY(-150%)}.skip-link:focus{transform:none}.site-header{height:108px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;font-size:23px;font-weight:650;letter-spacing:.06em}.brand img{border-radius:11px}.site-header nav{display:flex;align-items:center;gap:36px;font-size:14px}.site-header nav a{padding:10px 0}.site-header nav a:hover,.text-link:hover{color:#50794c}.nav-download span,.site-header nav a>span{margin-left:7px}.hero{min-height:650px;display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;padding-block:57px 69px}.eyebrow{display:flex;gap:9px;align-items:center;font-size:12px;letter-spacing:.11em;font-weight:500;color:#64745e}.status-dot{width:6px;height:6px;display:inline-block;background:#7f966c;border-radius:50%;flex:none}.hero h1{font-size:76px;line-height:1.28;margin:17px 0 14px;font-weight:650;letter-spacing:-.07em}.title-dot{color:#91a97b;margin-left:1px}.hero-statement{font-size:34px;font-weight:500;line-height:1.6;letter-spacing:.01em}.hero-description{font-size:15px;color:var(--muted);margin:20px 0 29px;line-height:1.95}.button{display:inline-flex;justify-content:center;align-items:center;gap:27px;min-height:54px;padding:13px 25px;border-radius:9px;font-size:15px;font-weight:500;transition:background .18s,transform .18s}.button svg{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}.button-primary{background:var(--green);color:#fffdf6;box-shadow:0 5px 12px #254c3e0a}.button-primary:hover{background:#37624c;transform:translateY(-2px)}.download-caption{font-size:11px;color:var(--muted);margin-top:14px;letter-spacing:.025em}.learning-figure{position:relative;min-height:482px;display:flex;align-items:center;justify-content:center;padding-bottom:25px;isolation:isolate}.figure-orbit{position:absolute;z-index:-1;width:425px;height:425px;border:1px solid #dae2ce;background:#e8eddc;border-radius:50%;top:19px;left:50%;transform:translateX(-50%)}.figure-orbit:after{content:"";position:absolute;inset:18px;border:1px dashed #c7d3b9;border-radius:50%;opacity:.7}.notebook{width:351px;background:var(--white);border:1px solid #e0e4d8;border-radius:14px;box-shadow:0 18px 35px #2f4b3310,5px 7px 0 #f1f0e5,6px 8px 0 #d8decd;transform:rotate(-4deg);overflow:hidden}.notebook-top{padding:21px 24px 18px;border-bottom:1px solid #e8eadd;display:flex;justify-content:space-between;align-items:center;font-size:12px}.notebook-title{display:flex;gap:8px;align-items:center;font-weight:500}.small-book{width:11px;height:14px;display:inline-block;border:1.5px solid #718363;border-radius:2px;position:relative}.small-book:after{content:"";width:1px;background:#718363;position:absolute;left:2px;top:0;bottom:0}.example-tag{font-size:9px;letter-spacing:.04em;color:#74816d;background:#eef2e5;padding:3px 7px;border-radius:4px}.question-area{padding:22px 29px 17px}.question-label{font-size:10px;letter-spacing:.06em;color:#788572}.math-question{font-family:Georgia,"Times New Roman",serif;font-size:34px;line-height:1.5;margin:12px 0 14px;letter-spacing:.02em}.math-question>span{color:#9fae8b}.checked-line{font-size:10px;color:#6f835f}.checked-line>span{display:inline-flex;width:15px;height:15px;align-items:center;justify-content:center;border-radius:50%;background:#e8efda;color:#597345;margin-right:5px;font-size:10px}.note-area{margin:0 20px 19px;padding:15px 19px 13px;background:repeating-linear-gradient(transparent,transparent 28px,#dee6d63d 29px,#dee6d63d 30px),#f5f7ed;border-radius:9px}.note-label{font-size:10px;color:#68785d;margin-bottom:8px}.note-label>span{font-size:16px;margin-right:4px}.note-area>p:nth-child(2){font-size:14px;line-height:1.9;color:#526749}.math-note{position:relative;font-family:Georgia,"Times New Roman",serif;font-style:italic;color:#557049;font-size:26px;margin:9px 0 0}.math-note>span{font-size:28px;padding-left:3px}.math-note svg{position:absolute;width:54px;height:13px;stroke:#c7a466;stroke-width:2;stroke-linecap:round;fill:none;left:88px;bottom:-5px}.notebook-bottom{padding:11px 25px 15px;font-size:9px;color:#8a957f;display:flex;gap:7px;align-items:center}.pencil-dot{height:5px;width:5px;background:#c8b584;border-radius:50%}.practice-note{position:absolute;bottom:53px;right:0;background:#fffefa;border:1px solid #e2e6d8;display:flex;gap:12px;align-items:center;box-shadow:0 10px 24px #2442320d;border-radius:11px;padding:15px 19px;transform:rotate(4deg)}.practice-check{width:32px;height:32px;display:grid;place-items:center;background:#e9f0de;color:#75905b;border-radius:50%;font-size:17px}.practice-note strong{display:block;font-size:13px;font-weight:500}.practice-note div>span{display:block;color:#89917f;font-size:10px;margin-top:2px}.learning-figure figcaption{font-size:9px;color:#87917e;position:absolute;bottom:0;left:0;right:0;text-align:center;letter-spacing:.04em}.figure-spark{position:absolute;color:#97aa7c}.spark-one{top:1px;right:25px;font-size:43px;transform:rotate(20deg)}.spark-two{font-size:25px;left:5px;bottom:55px;color:#bba67a}.workflow{padding-block:46px 56px;border-top:1px solid var(--line)}.section-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:29px}.section-heading h2{font-size:26px;line-height:1.5;margin-top:8px;letter-spacing:-.025em}.section-heading>p{font-size:12px;color:var(--muted);padding-bottom:5px}.steps-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.steps-grid li{position:relative;border:1px solid var(--line);border-radius:14px;padding:24px 23px 27px;background:#fafbf4;overflow:hidden}.step-number{font-family:Georgia,serif;font-size:24px;font-style:italic;color:#839470}.steps-grid h3{font-size:16px;margin:20px 0 10px;font-weight:500}.steps-grid p{color:var(--muted);font-size:12px;line-height:1.9}.step-symbol{position:absolute;right:21px;top:23px;color:#b6c3a7;font-size:23px;font-weight:300}.invitation{padding-bottom:60px}.invitation-inner{background:#e8eedf;border-radius:18px;padding:35px 39px;display:flex;align-items:center;justify-content:space-between;gap:24px;border:1px solid #dde5d2}.small-label{font-size:10px;color:#70815e;letter-spacing:.09em}.invitation h2{font-size:25px;margin:7px 0 7px}.invitation p{font-size:12px;color:#6b795f;line-height:1.85;max-width:650px}.button-light{background:#fffef6;color:var(--green);border:1px solid #d6dfc9;white-space:nowrap;font-size:13px;padding-inline:20px;min-height:48px;gap:19px}.button-light:hover{background:#f5f8eb}.site-footer{border-top:1px solid var(--line);padding-block:28px 32px;display:flex;align-items:center;justify-content:space-between;gap:16px}.footer-brand{display:flex;align-items:center;font-size:14px;font-weight:500;gap:20px}.footer-brand span{font-size:11px;font-weight:400;color:#85907c}.site-footer>p{font-size:10px;color:#84907b;letter-spacing:.035em}
/* Download page */
.download-main{padding-top:55px}.download-intro h1{font-size:48px;line-height:1.5;margin:16px 0 16px;letter-spacing:-.025em}.download-intro>p:last-child{font-size:14px;color:var(--muted)}.compatibility-note{margin:35px 0 34px;background:#efeedf;border:1px solid #e4dfc7;border-radius:12px;display:flex;gap:13px;padding:18px 22px;color:#666344}.info-icon{flex:none;font:italic 15px Georgia,serif;width:20px;height:20px;border:1px solid #929069;border-radius:50%;display:grid;place-items:center;margin-top:3px}.compatibility-note h2{font-size:14px;font-weight:500;letter-spacing:0;margin-bottom:4px}.compatibility-note p{font-size:12px;line-height:1.9;color:#777358}.download-layout{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:72px;align-items:start}.download-card{padding:30px;background:var(--white);border:1px solid #dce3d3;border-radius:19px;box-shadow:0 8px 25px #27482a05}.package-heading{display:flex;gap:17px;align-items:center}.package-heading h2{font-size:25px;letter-spacing:.02em}.package-heading p{color:var(--muted);font-size:11px;margin-top:3px}.package-tags{display:flex;flex-wrap:wrap;gap:7px;margin-top:22px}.package-tags span{font-size:10px;background:#eff3e8;border:1px solid #e6ebdc;border-radius:5px;padding:3px 8px;color:#6c7f5b}.package-description{font-size:19px;line-height:1.9;margin:21px 0 23px;color:#52654a}.package-download{width:100%;justify-content:space-between;padding-inline:23px;min-height:54px}.package-size{font-size:10px;text-align:center;color:#8a9381;margin-top:10px}.install-reminder{font-size:11px;text-align:center;color:#657359;line-height:1.9;margin:17px 0 0}.file-details{border-top:1px solid var(--line);margin-top:25px;padding-top:15px;font-size:11px}.file-details summary{display:flex;align-items:center;justify-content:space-between;cursor:pointer;list-style:none;min-height:34px;color:#7a8570}.file-details summary::-webkit-details-marker{display:none}.file-details summary span{font-size:16px;transition:transform .18s}.file-details[open] summary span{transform:rotate(45deg)}.file-details dl{margin:13px 0 15px}.file-details dl>div{margin:10px 0}.file-details dt{color:#88907f;font-size:10px}.file-details dd{margin:3px 0 0;color:#57694c;font-size:11px}.checksum{font-family:Consolas,monospace;overflow-wrap:anywhere;font-size:10px!important;line-height:1.8}.text-link{text-decoration:underline;text-underline-offset:4px;color:#607c52}.installation{padding-top:15px}.installation>h2{font-size:29px;line-height:1.5;margin:10px 0 28px}.install-steps{display:flex;flex-direction:column;gap:0}.install-steps li{display:flex;gap:22px;position:relative;padding-bottom:31px}.install-steps li>span{position:relative;z-index:1;flex:none;width:35px;height:35px;border:1px solid #d7dfca;border-radius:50%;background:#f0f3e7;display:grid;place-items:center;font:italic 13px Georgia,serif;color:#879872}.install-steps li:not(:last-child):before{content:"";position:absolute;left:17px;top:35px;height:calc(100% - 35px);border-left:1px solid #dce3d1}.install-steps h3{font-size:16px;font-weight:500;margin:2px 0 8px}.install-steps p{font-size:12px;color:var(--muted);line-height:1.95;max-width:370px}.install-steps code{font-family:inherit;background:#ecefe3;border-radius:3px;padding:1px 4px}.usage-notes{padding-block:52px 60px}.usage-notes .section-heading{padding-top:33px;border-top:1px solid var(--line);margin-bottom:26px}.usage-notes .section-heading h2{font-size:24px}.notes-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:40px}.note-icon{display:block;color:#90a379;font-size:24px;line-height:1;margin-bottom:15px}.notes-grid h3{font-size:15px;font-weight:500;margin-bottom:9px}.notes-grid p{font-size:12px;line-height:1.9;color:var(--muted)}
@media(min-width:1400px){.hero{min-height:690px;gap:75px}.hero h1{font-size:82px}.hero-statement{font-size:37px}.learning-figure{min-height:503px}.notebook{width:363px}.notebook-top{padding-block:23px}.question-area{padding-block:25px 20px}.note-area{padding-bottom:18px}.figure-orbit{width:460px;height:460px;top:7px}.practice-note{right:-6px;bottom:64px}}
@media(max-width:1050px){.wrap{width:calc(100% - 64px)}.hero{gap:20px;min-height:615px}.hero h1{font-size:68px}.hero-statement{font-size:30px}.hero-description{font-size:13px}.figure-orbit{width:355px;height:355px;top:50px}.notebook{width:308px}.notebook-top{padding:19px}.question-area{padding:20px 24px 17px}.math-question{font-size:30px}.note-area{margin-inline:16px;padding-inline:16px}.practice-note{right:-5px;padding:12px 14px;bottom:69px}.spark-one{right:6px;top:21px}.spark-two{left:0}.steps-grid{gap:12px}.steps-grid li{padding:20px 17px 23px}.steps-grid h3{font-size:14px}.steps-grid p{font-size:11px}.step-symbol{right:17px;top:20px}.section-heading>p{max-width:160px}.download-layout{gap:40px}.download-card{padding:25px}.installation>h2{font-size:25px}.install-steps li{gap:16px}.notes-grid{gap:28px}}
@media(max-width:780px){.wrap{width:calc(100% - 48px)}.site-header{height:86px}.brand{font-size:21px;gap:10px}.brand img{width:34px;height:34px}.site-header nav{gap:22px;font-size:12px}.hero{grid-template-columns:1fr;padding-block:37px 37px;gap:31px;min-height:0}.hero-copy{text-align:center}.hero-copy .eyebrow{justify-content:center}.hero h1{font-size:66px;margin-top:15px}.hero-statement{font-size:29px}.hero-description{font-size:14px;margin-block:17px 23px}.hero .button{min-width:200px}.learning-figure{width:min(450px,100%);margin-inline:auto;min-height:476px}.figure-orbit{width:390px;height:390px;top:26px}.notebook{width:320px}.practice-note{right:7px;bottom:47px}.spark-one{right:10px;top:15px}.spark-two{bottom:45px;left:8px}.workflow{padding-block:31px 36px}.section-heading{display:block;margin-bottom:23px}.section-heading h2{font-size:24px}.section-heading>p{max-width:none;margin-top:10px}.steps-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}.steps-grid li{padding:22px}.steps-grid h3{font-size:15px;margin-top:15px}.steps-grid p{font-size:12px}.invitation{padding-bottom:36px}.invitation-inner{padding:27px;align-items:flex-start;flex-direction:column;gap:20px}.invitation h2{font-size:23px}.site-footer{padding-block:23px;flex-wrap:wrap}.footer-brand{gap:14px}.download-main{padding-top:35px}.download-intro h1{font-size:39px;line-height:1.5}.compatibility-note{margin-block:26px 26px;padding:17px 18px}.download-layout{grid-template-columns:1fr;gap:29px}.download-card{padding:28px;max-width:none}.package-description{font-size:18px}.installation{padding-top:10px}.installation>h2{font-size:25px;margin-bottom:24px}.install-steps p{max-width:none}.install-steps li{gap:18px;padding-bottom:26px}.usage-notes{padding-block:8px 39px}.notes-grid{grid-template-columns:1fr;gap:22px}.notes-grid article{position:relative;padding-left:39px}.note-icon{position:absolute;left:0;top:3px;font-size:23px}.usage-notes .section-heading{padding-top:28px}.usage-notes .section-heading h2{font-size:23px}}
@media(max-width:420px){.wrap{width:calc(100% - 40px)}.site-header{height:78px}.brand{font-size:20px;gap:8px}.brand img{width:32px;height:32px}.nav-how{display:none}.site-header nav{font-size:12px}.hero{padding-top:29px;gap:24px}.eyebrow{font-size:10px}.hero h1{font-size:61px;margin-block:15px 10px}.hero-statement{font-size:27px;line-height:1.65}.hero-description{font-size:12px;margin-block:16px 23px}.hero .button{font-size:14px;min-height:50px}.download-caption{font-size:9px;margin-top:12px}.learning-figure{min-height:442px;padding-bottom:24px}.figure-orbit{width:310px;height:310px;top:48px}.notebook{width:274px}.notebook-top{padding:17px 16px;font-size:11px}.question-area{padding:19px 21px 15px}.math-question{font-size:28px;margin:10px 0 13px}.note-area{margin:0 13px 13px;padding:12px 16px}.note-area>p:nth-child(2){font-size:13px}.notebook-bottom{padding:10px 20px 14px}.practice-note{right:-1px;bottom:39px;padding:10px 12px;gap:8px}.practice-note strong{font-size:11px}.practice-note div>span{font-size:9px}.practice-check{width:27px;height:27px;font-size:14px}.spark-one{font-size:32px;top:10px;right:10px}.spark-two{bottom:54px;font-size:21px;left:1px}.learning-figure figcaption{font-size:8px}.section-heading h2{font-size:22px}.steps-grid{gap:10px}.steps-grid li{padding:19px 15px}.step-number{font-size:22px}.step-symbol{font-size:21px;right:14px;top:17px}.steps-grid h3{font-size:14px}.steps-grid p{font-size:11px}.invitation-inner{padding:25px 22px}.invitation h2{font-size:22px}.invitation p{font-size:11px}.footer-brand{font-size:13px;gap:12px}.footer-brand span{font-size:10px}.site-footer{gap:8px}.site-footer>p{font-size:9px}.download-intro h1{font-size:34px}.download-intro>p:last-child{font-size:12px}.compatibility-note{padding:16px 14px;gap:10px}.compatibility-note h2{font-size:13px}.compatibility-note p{font-size:11px}.download-card{padding:23px}.package-heading{gap:13px}.package-heading img{width:56px;height:56px}.package-heading h2{font-size:23px}.package-heading p{font-size:10px}.package-description{font-size:18px}.install-reminder{font-size:10px}.installation>h2{font-size:23px}.install-steps h3{font-size:15px}.install-steps p{font-size:11px}.usage-notes .section-heading h2{font-size:22px}.notes-grid h3{font-size:14px}.notes-grid p{font-size:11px}}
@media(max-width:780px){.hero-description{font-size:14px}.steps-grid p{font-size:12px}.compatibility-note h2{font-size:14px}.compatibility-note p{font-size:13px}.install-reminder{font-size:12px}.install-steps p,.notes-grid p{font-size:13px}.download-intro>p:last-child{font-size:14px}.invitation p{font-size:13px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.button,.file-details summary span{transition:none}.button-primary:hover{transform:none}}
.platform-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;margin:38px 0}.platform-grid .download-card{min-width:0;padding:28px}.platform-grid h2{font-size:25px}.platform-description{min-height:100px;line-height:1.85;margin:20px 0}.platform-grid .button{width:100%;justify-content:center}.platform-grid .checksum{overflow-wrap:anywhere}.tiny-note{font-size:13px;line-height:1.8;color:#63746e}.unified-hero-note{background:#fff;border:1px solid #dde5dc;border-radius:24px;padding:42px;box-shadow:14px 16px 0 #e7e9d7}.unified-equation{font-size:76px;letter-spacing:-4px;font-weight:700;margin:26px 0}.unified-equation span{color:#be8152}.unified-hero-note ol{padding-left:22px;line-height:2.4}.unified-hero-note small{color:#63746e}@media(max-width:900px){.platform-grid{grid-template-columns:1fr}.platform-description{min-height:0}.platform-grid .download-card{padding:28px}.unified-hero-note{padding:28px}.unified-equation{font-size:58px}.site-header nav{gap:15px;flex-wrap:wrap}.site-header nav a{font-size:13px}}