@charset "UTF-8";
:root{--learn-ink:#172e3b;--learn-muted:#5d7180;--learn-line:#dce5e8;--learn-green:#147c64;--text:#f6f8fb;--container:1280px;--line:rgba(255,255,255,.12)}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:110px}body.learn-page{margin:0;background:#fbfcfc;color:var(--learn-ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}.learn-page a{color:inherit;text-decoration:none}.learn-page button,.learn-page input{font:inherit}.learn-page button{cursor:pointer}.learn-page [hidden]{display:none!important}.learn-page h1,.learn-page h2,.learn-page h3,.learn-page p{margin:0}.learn-page h1,.learn-page h2,.learn-page h3{line-height:1.35;letter-spacing:-.035em}.learn-page :focus-visible{outline:3px solid #e17e3f;outline-offset:4px}.skip-link{position:fixed;left:16px;top:-80px;z-index:1000;padding:12px 20px;background:white}.skip-link:focus{top:12px}
.learn-page .site-header{background:#102530;backdrop-filter:none;min-height:76px;padding:14px max(24px,calc((100vw - 1280px)/2));color:#e7eff3}.learn-page .site-header .brand{min-width:175px}.learn-page .site-header .brand-copy small{font-size:10px;color:#acbdc7}.learn-page .site-header .header-action{background:#d7f1e9;color:#113d35;border-color:#d7f1e9;box-shadow:none}.learn-page .site-header .header-login{color:#f6f8fb}.learn-page .site-nav-panel{background:#183440;color:#fff}.learn-page .site-nav-link,.learn-page .site-nav-menu summary{font-size:13px}.learn-page .site-nav-menu summary[aria-current]{color:#b3ead8}
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.catalog-section{padding:60px 0}.catalog-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:20px}.section-label{font-size:12px;font-weight:650;color:var(--learn-muted);letter-spacing:.05em;margin-bottom:8px}.catalog-heading h2,.help-strip h2{font-size:29px}.tutorial-search{width:330px;display:flex;align-items:center;gap:10px;background:#fff;border:1px solid #cddade;padding:9px 12px;border-radius:6px;color:#6a7c87}.tutorial-search>span{font-size:25px;line-height:1}.tutorial-search input{border:0;outline:0;background:transparent;color:var(--learn-ink);width:100%;min-width:0;font-size:13px}.tutorial-search:focus-within{outline:2px solid var(--learn-green);outline-offset:2px}.tutorial-search kbd{font-size:12px;border:1px solid #d9e2e6;padding:0 6px;border-radius:3px}.catalog-controls{display:flex;justify-content:space-between;gap:20px;align-items:center;margin:28px 0 24px}.category-filters{display:flex;flex-wrap:wrap;gap:8px}.category-filters button{border:1px solid transparent;padding:7px 13px;background:transparent;border-radius:5px;color:#647581;font-size:13px;min-height:38px}.category-filters button[aria-pressed=true]{background:#e7f2ee;color:#09654e;border-color:#d2e7de;font-weight:650}.category-filters button:hover{background:#eef3f2}.catalog-controls>[role=status]{color:#748590;font-size:12px;white-space:nowrap}.tutorial-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px 24px}.tutorial-card{display:flex;flex-direction:column;border:1px solid var(--learn-line);background:white;border-radius:8px;overflow:hidden;transition:border-color .15s,transform .15s}.tutorial-card:hover{border-color:#6ba48e;transform:translateY(-3px)}.card-image{aspect-ratio:1.85;background:#edf3f3;position:relative;overflow:hidden;border-bottom:1px solid #e1e9ec}.card-image img{width:100%;height:100%;object-fit:cover;object-position:center 45%;display:block}.card-image>span{position:absolute;bottom:10px;left:12px;background:#fff;padding:2px 8px;border:1px solid #d9e5e8;border-radius:3px;font-size:10px;color:#355966;font-weight:650}.card-copy{padding:20px;display:flex;flex-direction:column;flex:1}.card-meta{display:flex;justify-content:space-between;color:var(--learn-green);font-size:11px;margin-bottom:9px}.card-meta span{color:#80909a}.card-copy h3{font-size:18px;font-weight:650;letter-spacing:-.025em}.card-copy p{font-size:13px;line-height:1.8;color:#687b88;margin-top:10px;margin-bottom:22px}.card-link{display:flex;justify-content:space-between;font-size:12px;color:#1e6852;font-weight:600;margin-top:auto}.catalog-empty{text-align:center;padding:60px 20px;border:1px dashed var(--learn-line);background:#fff}.catalog-empty strong{font-size:20px}.catalog-empty p{color:var(--learn-muted);margin:12px 0}.catalog-empty button{border:0;background:#e6f2ec;color:#17674f;padding:10px 16px;border-radius:5px}
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.learn-breadcrumb{display:flex;gap:12px;padding-top:114px;font-size:12px;color:#71858f}.learn-breadcrumb a{color:var(--learn-green)}.article-hero{max-width:880px;padding:32px 0 38px}.article-hero h1{font-size:clamp(30px,3.4vw,45px);margin:15px 0 20px}.article-hero>p{color:var(--learn-muted);font-size:16px;line-height:1.9;max-width:780px}.article-meta{display:flex;gap:22px;flex-wrap:wrap;font-size:12px;color:#798e98;margin-top:23px}.article-meta span+span:before{content:"·";margin-right:22px}.article-layout{display:grid;grid-template-columns:245px minmax(0,1fr);gap:52px;border-top:1px solid var(--learn-line);padding:36px 0 64px}.article-toc{position:sticky;top:105px;align-self:start;max-height:calc(100vh - 130px);overflow-y:auto;padding-right:20px}.article-toc summary{list-style:none;font-size:13px;font-weight:700;margin-bottom:15px;cursor:pointer}.article-toc summary::-webkit-details-marker{display:none}.article-toc summary>span{float:right}.article-toc nav{display:flex;flex-direction:column;gap:6px}.article-toc nav a{display:flex;gap:10px;padding:9px 8px;font-size:12px;line-height:1.8;color:#677d88;border-left:2px solid transparent}.article-toc nav a span{font-family:monospace;color:#9aabb1}.article-toc nav a.active{color:#106e55;background:#edf5f1;border-left-color:var(--learn-green)}.toc-support{display:block;font-size:12px;color:var(--learn-green)!important;border-top:1px solid var(--learn-line);margin-top:28px;padding-top:20px}.article-content{min-width:0;max-width:900px}.preparation{border:1px solid #d4e6dd;background:#f0f7f3;padding:24px 28px;border-radius:6px}.preparation h2{font-size:18px}.preparation ul{margin:14px 0;padding-left:22px;color:#486b5b;font-size:14px}.preparation li{padding:4px 0}.preparation>p{font-size:12px;color:#708579;border-top:1px solid #d8e7df;padding-top:13px}.tutorial-step{margin-top:52px;padding-top:4px;scroll-margin-top:100px}.step-heading{display:flex;gap:16px;align-items:baseline}.step-number{font:600 22px/1.2 monospace;color:#25816a}.step-heading h2{font-size:24px}.step-instruction{font-size:15px;line-height:1.95;color:#506977;margin:17px 0 22px!important}.step-figure{margin:0}.image-zoom{display:block;position:relative;border:1px solid #d9e4e7;border-radius:8px;overflow:hidden;cursor:zoom-in}.image-zoom img{display:block;width:100%;height:auto}.zoom-label{position:absolute;right:12px;bottom:12px;background:white;border:1px solid #cfdee2;border-radius:4px;padding:4px 10px;font-size:11px;color:#35644f;box-shadow:0 1px 5px #172e3b0a}.step-figure figcaption{display:flex;justify-content:space-between;font-size:11px;color:#7c8e98;padding:9px 2px}.step-figure figcaption>span{color:#8b9da6}.step-result{display:flex;align-items:baseline;gap:12px;margin-top:13px!important;color:#477460;font-size:13px;line-height:1.8}.step-result>span{flex-shrink:0;color:#116a50;font-weight:650}.step-result>span:before{content:"✓";margin-right:6px}.step-tip{font-size:13px;line-height:1.9;color:#856143;background:#fbf5ec;border-left:2px solid #dc9c5b;padding:13px 16px;margin-top:13px}.step-tip strong{display:block;font-size:11px;letter-spacing:.02em;margin-bottom:2px}.learn-faq{border-top:1px solid var(--learn-line);margin-top:52px;padding-top:32px}.learn-faq h2{font-size:24px;margin-bottom:22px}.learn-faq details{border-bottom:1px solid var(--learn-line);padding:17px 0}.learn-faq summary{cursor:pointer;font-size:14px;font-weight:600}.learn-faq details p{font-size:14px;color:var(--learn-muted);margin-top:13px;line-height:1.9}.article-sources{margin-top:32px;padding:20px 0;border-bottom:1px solid var(--learn-line)}.article-sources h2{font-size:14px;margin-bottom:12px}.article-sources a{color:var(--learn-green);font-size:12px;margin:0 24px 8px 0;display:inline-block}.article-sources p{font-size:11px;color:#8b9ba3}.article-related{margin-top:36px}.article-related h2{font-size:20px;margin-bottom:16px}.article-related a{display:grid;grid-template-columns:140px 1fr 20px;align-items:center;gap:14px;padding:16px 0;border-bottom:1px solid var(--learn-line)}.article-related a>span{font-size:11px;color:#81939c}.article-related a>strong{font-size:14px;font-weight:500}.article-related b{font-size:16px;color:var(--learn-green)}.back-center{display:inline-block;margin-top:28px;font-size:13px;color:var(--learn-green)!important}
.image-dialog{border:0;border-radius:10px;padding:0;width:min(1200px,96vw);max-width:96vw;max-height:94dvh;background:#fff;box-shadow:0 24px 80px #0004;color:var(--learn-ink)}.image-dialog::backdrop{background:#102733dd}.image-dialog-bar{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:12px 18px;border-bottom:1px solid var(--learn-line);font-size:12px}.image-dialog-bar button{border:1px solid #cbd9df;border-radius:5px;background:#fff;padding:6px 12px;font-size:13px;min-height:36px}.image-dialog-scroll{overflow:auto;max-height:calc(94dvh - 115px);overscroll-behavior:contain}.image-dialog-scroll img{display:block;width:100%;min-width:800px;height:auto}.image-dialog-caption{padding:10px 18px;font-size:12px;color:var(--learn-muted)}body.image-open{overflow:hidden}
@media(min-width:1600px){.learn-shell{padding:0}.learn-hero{padding-top:160px}}
@media(max-width:1150px){.learn-page .site-header .brand{min-width:130px}.learn-hero{gap:30px}.hero-visual{padding:23px 18px 0}.route-node svg{width:65px;height:65px}.route-illustration:before{top:32px}.route-node small{font-size:10px}.quick-paths a{flex-direction:column;gap:3px}.quick-paths span{align-self:flex-start}.article-layout{gap:32px;grid-template-columns:205px minmax(0,1fr)}.learn-footer{margin:0 32px}.card-copy{padding:17px}.card-copy h3{font-size:17px}}
@media(max-width:800px){.learn-page .site-header{padding:13px 20px}.learn-shell{padding:0 22px}.learn-hero{padding-top:120px;grid-template-columns:1fr;gap:30px;padding-bottom:32px}.hero-copy h1{font-size:42px}.hero-copy>p{font-size:15px}.hero-visual{max-width:none}.route-illustration{margin:20px 0}.route-node svg{width:70px;height:70px}.route-node small{font-size:11px}.hero-proof{padding:14px 0}.quick-paths{grid-template-columns:repeat(4,1fr)}.quick-paths a{padding:18px 12px;font-size:14px}.quick-paths span{font-size:10px}.catalog-section{padding:38px 0}.catalog-heading{align-items:stretch;flex-direction:column;gap:20px}.tutorial-search{width:100%}.catalog-controls{flex-direction:column;align-items:flex-start;gap:12px;margin-top:20px}.tutorial-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px 16px}.catalog-heading h2,.help-strip h2{font-size:25px}.help-strip{padding:24px;flex-direction:column;align-items:flex-start;gap:20px}.learn-footer{margin:0 22px;flex-wrap:wrap;gap:12px 20px}.learn-footer nav{width:100%;margin-left:0;flex-wrap:wrap;gap:18px}.article-layout{display:block;padding-top:22px}.article-toc{position:static;max-height:none;padding:0;border:1px solid var(--learn-line);border-radius:6px;background:#fff;margin-bottom:26px}.article-toc summary{padding:14px 18px;margin:0}.article-toc nav{padding:0 12px 12px}.article-toc nav a{font-size:13px}.toc-support{display:none}.article-hero{padding:25px 0 28px}.article-hero>p{font-size:15px}.article-meta{gap:12px;font-size:11px}.article-meta span+span:before{margin-right:12px}.article-related a{grid-template-columns:90px 1fr 20px}.learn-breadcrumb{padding-top:106px}}
@media(max-width:500px){.learn-shell{padding:0 18px}.learn-page .site-header{padding:12px 16px}.learn-page .site-header .brand{min-width:0}.hero-copy h1{font-size:38px}.hero-copy>p br{display:none}.hero-copy .eyebrow{font-size:11px}.learn-primary{font-size:14px;width:100%;justify-content:space-between}.hero-secondary{font-size:12px}.hero-visual{padding:20px 14px 0}.hero-visual-top{font-size:11px}.route-node strong{font-size:14px}.route-node small{font-size:9px}.route-node svg{width:58px;height:58px;padding:8px}.route-illustration{gap:5px;margin:22px 0}.route-illustration:before{top:28px}.route-node span{margin-top:8px}.hero-proof{font-size:11px}.quick-paths{grid-template-columns:repeat(2,1fr)}.quick-paths a{padding:16px 14px;flex-direction:row;align-items:center;gap:6px}.quick-paths a:first-child{padding-left:14px}.quick-paths a:nth-child(2){border-right:0}.quick-paths a:nth-child(-n+2){border-bottom:1px solid var(--learn-line)}.quick-paths span{align-self:center;font-size:10px}.tutorial-grid{grid-template-columns:1fr;gap:22px}.card-image{aspect-ratio:2.05}.card-copy h3{font-size:19px}.card-copy{padding:20px}.card-copy p{font-size:14px}.card-meta{font-size:12px}.card-link{font-size:13px}.category-filters{gap:6px}.category-filters button{font-size:12px;padding:7px 11px}.help-strip h2{font-size:22px}.help-strip p{font-size:13px}.article-hero h1{font-size:31px}.article-meta{gap:8px}.article-meta span+span:before{display:none}.article-meta span{background:#edf2f4;padding:3px 8px;border-radius:3px}.preparation{padding:20px}.preparation h2{font-size:17px}.preparation ul{font-size:13px}.tutorial-step{margin-top:38px}.step-heading{gap:12px}.step-heading h2{font-size:21px}.step-number{font-size:20px}.step-instruction{font-size:14px}.step-result{display:block;font-size:13px}.step-result>span{display:block;margin-bottom:3px}.step-tip{font-size:12px}.step-figure figcaption{font-size:10px;gap:8px}.zoom-label{font-size:10px;padding:3px 7px;right:8px;bottom:8px}.image-dialog-bar{padding:10px;font-size:10px;gap:8px}.image-dialog-bar button{font-size:12px;white-space:nowrap}.article-related a{grid-template-columns:1fr 22px;gap:4px}.article-related a>span{grid-column:1}.article-related a>strong{grid-column:1}.article-related b{grid-column:2;grid-row:span 2}.learn-faq h2{font-size:23px}.learn-footer{margin:0 18px}.learn-footer>span{font-size:11px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.tutorial-card{transition:none}.tutorial-card:hover{transform:none}}
@media print{.site-header,.article-toc,.learn-footer,.image-dialog,.back-center,.zoom-label,.article-related{display:none!important}.learn-shell{max-width:none;padding:0}.learn-breadcrumb{padding-top:0}.article-layout{display:block}.article-hero{padding:18px 0}.tutorial-step{break-inside:avoid;margin-top:20px}.step-figure img{max-height:320px;object-fit:contain}.learn-page a{color:#000}.skip-link{display:none}}

.learn-page h1{text-wrap:balance}.article-action{display:inline-block;color:var(--learn-green)!important;font-size:13px;margin-top:18px;border-bottom:1px solid #c6ddd1}.real-screen{margin-top:20px}.real-screen img{aspect-ratio:auto}.capture-note{font-size:11px;color:#7a8e98;margin-top:4px!important}

/* Revision 2: match IPIP777 production dark theme. */
:root{color-scheme:dark;--learn-ink:#f6f8fb;--learn-muted:#a8b2c3;--learn-line:rgba(255,255,255,.12);--learn-green:#6ee7ff;--text:#f6f8fb}
body.learn-page{background:radial-gradient(ellipse at 15% 0,rgba(110,231,255,.065),transparent 30%),radial-gradient(ellipse at 90% 0,rgba(111,77,255,.09),transparent 35%),#05070d;color:#f6f8fb}
.learn-page .site-header{background:#070b13;color:#e7edf7}.learn-page .site-header .header-action{background:#6f4dff;border-color:#6f4dff;color:white}.learn-page .site-nav-menu summary[aria-current]{color:#6ee7ff}.learn-page .site-nav-panel{background:#101625}.skip-link{background:#161e2c;color:#fff}
.learn-primary{background:#6f4dff;color:#fff!important}.learn-primary:hover{background:#8063ff}.hero-visual{background:#0b111e;border-color:#263247}.hero-visual-top,.hero-visual-top b{color:#b8c6d8}.route-node svg{background:#0b111e;color:#6ee7ff}.route-illustration:before{background:#314559}.route-node span,.route-node small{color:#a5b3c7}.hero-proof{border-color:#253346;color:#c4d8e6}.proof-check{background:#2aa37c;color:#fff}
.tutorial-search{background:#090e18;border-color:#354156;color:#b5c1d4}.tutorial-search input{color:#f6f8fb}.tutorial-search kbd{border-color:#374357;color:#a8b2c3}.tutorial-search:focus-within{outline-color:#6ee7ff}.category-filters button{color:#b1bed2}.category-filters button:hover{background:#152033}.category-filters button[aria-pressed=true]{background:#142b39;color:#6ee7ff;border-color:#31536a}.catalog-controls>[role=status]{color:#9eacc0}
.tutorial-card{background:#0b101a;border-color:#293143}.tutorial-card:hover{border-color:#6ee7ff}.card-image{background:#111722;border-color:#263244}.card-image>span{background:#080d16e8;border-color:#3a4b64;color:#e1f0ff}.card-copy p{color:#a8b2c3}.card-meta span{color:#a4afc2}.card-link{color:#6ee7ff}.catalog-empty{background:#0b101a}.catalog-empty button{background:#173144;color:#a9f1ff}
.help-strip{background:#0b1420;border-left-color:#6ee7ff}.help-strip p{color:#a8b2c3}.learn-footer{color:#a8b2c3}.learn-breadcrumb{color:#a8b2c3}.article-meta{color:#a8b2c3}.article-toc nav a{color:#a8b2c3}.article-toc nav a span{color:#8fa1b8}.article-toc nav a.active{background:#112432;color:#94edff;border-color:#6ee7ff}.preparation{background:#0c1621;border-color:#294052}.preparation ul{color:#c3d3e2}.preparation>p{color:#9aafc3;border-color:#263c4e}.step-number{color:#6ee7ff}.step-instruction{color:#becbdb}.image-zoom{border-color:#2a394c;background:#080c13}.zoom-label{background:#101a28ed;border-color:#40536c;color:#d3e8f9}.step-figure figcaption,.step-figure figcaption>span{color:#99acc3}.step-result{color:#9bdfc6}.step-result>span{color:#54e3b2}.step-tip{background:#20190f;color:#e2c393;border-left-color:#ddad65}.article-sources p{color:#8fa2ba}.article-related a>span{color:#9cacc2}.image-dialog{background:#0b101a;color:#f6f8fb}.image-dialog-bar button{background:#151e2e;color:#fff;border-color:#394861}.image-dialog::backdrop{background:#02050de8}.capture-note{color:#9aacbf}
.article-action{border-color:#375a70}.source-type{display:inline-block;font-size:11px;color:#a8b2c3}
@media(max-width:800px){.article-toc{background:#0b101a;border-color:#293849}}
@media(max-width:500px){.article-meta span{background:#151f2e;color:#b4c4d8}}
/* Screenshot-based teaching layout. */
.interface-stage{height:285px;position:relative;margin:24px 0 10px}.interface-stage img{display:block;object-fit:cover;border:1px solid #3a4a61;box-shadow:0 15px 38px #0008}.preview-desktop{position:absolute;left:0;top:23px;width:84%;border-radius:8px}.preview-phone{position:absolute;right:0;top:0;width:31%;border-radius:12px;max-height:275px;object-position:top}.phone-screen{max-width:460px;margin-inline:auto}.step-figure figcaption{gap:16px;align-items:flex-start;line-height:1.8}.source-type{flex-shrink:0}.step-figure.phone-screen figcaption{flex-wrap:wrap;gap:3px}.card-image img{object-position:center 25%}.card-image img[src*="ios-"],.card-image img[src*="android-import"]{object-position:center 25%}.image-dialog-scroll img{max-width:none}.step-figure{margin-top:8px}.article-content .real-screen{margin-top:8px}
@media(max-width:1100px){.interface-stage{height:245px}.preview-phone{max-height:235px}}
@media(max-width:800px){.interface-stage{height:310px;max-width:530px;margin-inline:auto}.preview-phone{max-height:300px}}
@media(max-width:500px){.interface-stage{height:218px;margin-top:18px}.preview-phone{max-height:208px}.hero-visual-top{font-size:10px}.hero-proof{font-size:10px}.step-figure figcaption{display:block}.step-figure .source-type{display:block;margin-top:3px}.phone-screen{max-width:100%}}
.interface-stage{height:320px}.preview-desktop{height:285px;object-fit:cover;object-position:top}
@media(max-width:1100px){.interface-stage{height:245px}.preview-desktop{height:210px}}
@media(max-width:800px){.interface-stage{height:310px}.preview-desktop{height:275px}}
@media(max-width:500px){.interface-stage{height:218px}.preview-desktop{height:180px}}