*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:40px}body{margin:0;background:var(--color-canvas);color:var(--color-ink);font:var(--type-body)/1.7 var(--font-ui);-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button{font:inherit;color:inherit;cursor:pointer}button,a{-webkit-tap-highlight-color:transparent;touch-action:manipulation}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid var(--color-accent);outline-offset:5px}.icon{width:19px;height:19px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;flex:none}.icon-defs{position:absolute;width:0;height:0;overflow:hidden}.shell{max-width:calc(var(--page-width) + var(--page-gutter)*2);padding-inline:var(--page-gutter);margin-inline:auto}.sr-only{position:absolute;width:1px;height:1px;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;left:16px;top:-80px;z-index:100;background:var(--color-ink);color:white;padding:12px 16px}.skip-link:focus{top:10px}.button{display:inline-flex;justify-content:center;align-items:center;gap:18px;background:var(--color-ink);border:1px solid var(--color-ink);color:white;padding:13px 21px;border-radius:8px;font-size:13px;font-weight:550;line-height:20px;white-space:nowrap;transition:background var(--motion-press),transform var(--motion-press)}.button:active{transform:scale(.98)}.button-outline{background:white;color:var(--color-ink);border-color:var(--color-border)}.button-small{font-size:12px;padding:9px 14px;gap:18px}.button-small .icon{width:15px;height:15px}.text-link{display:inline-flex;gap:11px;align-items:center;font-size:13px;font-weight:500}.text-link .icon{height:16px;width:16px;transition:transform var(--motion-press)}.site-header{height:88px;display:flex;align-items:center;justify-content:space-between;gap:30px;position:relative;z-index:4}.brand{display:inline-flex;align-items:center;gap:9px;font-size:23px;font-weight:670;letter-spacing:-1px}.brand-symbol{width:30px;height:30px}.hero{position:relative;isolation:isolate;min-height:780px;overflow:hidden}.hero-copy{position:relative;z-index:2;text-align:center;padding-top:98px;pointer-events:none}.hero-copy>*{pointer-events:auto}h1{font-size:var(--landing-type-hero);font-weight:640;letter-spacing:-3.5px;line-height:1.3;margin:0}h1>span{display:block}.taste-word{position:relative;font-family:"Songti SC","STSong",Georgia,serif;font-weight:700;letter-spacing:-2px}.taste-word svg{position:absolute;width:105%;left:0;bottom:-7px;height:19px;stroke:var(--color-accent);stroke-width:2.1;fill:none}.hero-copy>p{font-size:16px;line-height:1.95;color:var(--color-subtle);margin:31px auto 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.icon{transform:rotate(90deg);width:16px;height:16px;color:#7c899f}.chapter{margin-top:var(--landing-chapter-space)}h2{font-size:var(--landing-type-section);line-height:1.33;letter-spacing:-1.7px;font-weight:600;margin:0}.reveal{position:relative}.discovery-section{margin-top:70px}.standards-section{display:grid;grid-template-columns:1fr 1.08fr;gap:95px;align-items:center}.standards-copy>h2{margin-bottom:26px}.standards-copy>p.lead{font-size:17px;color:var(--color-ink);line-height:1.85;margin-bottom:16px}.site-footer{display:flex;justify-content:space-between;align-items:center;gap:25px;min-height:110px;border-top:1px solid var(--color-border)}.site-footer>.brand{font-size:20px}.site-footer>div{display:flex;gap:29px;font-size:10px;color:var(--color-subtle)}dialog{border:1px solid var(--color-border);border-radius:20px;padding:0;max-width:min(500px,calc(100vw - 36px));width:500px;color:var(--color-ink);background:white;box-shadow:var(--shadow-overlay);max-height:calc(100dvh - 48px);overflow:auto}dialog::backdrop{background:rgb(20 25 35 / 35%)}.guide-content{padding:38px;position:relative}.close-button{position:absolute;top:20px;right:20px;border:0;border-radius:50%;background:var(--color-surface);width:30px;height:30px;display:grid;place-items:center}.close-button .icon{width:15px;height:15px}.guide-content>h2{font-size:31px;margin:18px 0 25px;letter-spacing:-1px}.guide-steps{padding:0 0 0 20px;font-size:12px;line-height:1.9;color:var(--color-subtle);margin-bottom:24px}.guide-steps li{padding-left:3px;margin-bottom:8px}.guide-steps code{font-family:var(--font-mono);color:var(--color-ink);font-size:11px}.prompt-example{background:var(--color-surface);padding:17px;border-radius:10px;margin-bottom:24px}.prompt-example>div{display:flex;justify-content:space-between;align-items:center;font-size:10px;color:var(--color-subtle);margin-bottom:10px}.prompt-example button{border:0;background:transparent;display:grid;place-items:center;padding:7px;color:var(--color-subtle)}.prompt-example .icon{width:14px;height:14px}.prompt-example p{font-size:12px;line-height:1.95;margin:0}.guide-download{width:100%}.guide-note{font-size:10px;color:var(--color-subtle);line-height:1.8;margin:13px 0 0}.toast{position:fixed;bottom:25px;left:50%;transform:translate(-50%,8px);opacity:0;pointer-events:none;padding:12px 18px;border-radius:9px;background:var(--color-ink);color:white;box-shadow:var(--shadow-overlay);font-size:12px;z-index:100;max-width:calc(100vw - 32px);text-align:center}
@media(hover:hover) and (pointer:fine){.button:hover{background:#37383d}.button-outline:hover{background:#f5f7fa}.text-link:hover,.site-footer a:hover{color:var(--color-accent)}.text-link:hover .icon{transform:translateX(3px)}}
@media(max-width:1100px){.hero-copy{padding-top:92px}h1{letter-spacing:-2.6px}.hero{min-height:750px}.type-object-a{left:85%;width:109px;height:143px}.type-object-a>span{font-size:52px}.type-object-b{left:4%;width:82px;height:105px}.type-object-b>span{font-size:53px}.coordinate-one{left:17%}.coordinate-two{right:13%}.standards-section{gap:55px}}
@media(max-width:860px){.site-header{height:77px;gap:22px}.hero{min-height:704px}.hero-copy{padding-top:85px}.hero-copy>p{font-size:14px;margin-top:28px}.hero-actions{gap:23px}.type-object-a{top:53%;left:83%;width:89px;height:117px}.type-object-a>span{font-size:44px;letter-spacing:-5px}.type-object-b{top:59%;left:4%;width:67px;height:88px}.type-object-b>span{font-size:45px}.hero-coordinate{font-size:10px}.coordinate-one{top:82%;left:18%}.coordinate-two{top:83%;right:15%}.coordinate-three{display:none}.hero-orbit{opacity:.65}.discovery-section{margin-top:70px}.standards-section{gap:35px;grid-template-columns:.9fr 1fr}.standards-copy>h2{font-size:37px}.standards-copy>p.lead{font-size:15px}.standards-copy>p{font-size:12px}}
@media(max-width:600px){html{scroll-padding-top:28px}.site-header{height:72px;gap:18px}.brand{font-size:22px}.brand-symbol{width:28px;height:28px}.site-header .button{padding:8px 12px;font-size:11px;gap:12px}.hero{min-height:690px}.hero-copy{padding-top:75px}h1{font-size:var(--landing-type-hero);letter-spacing:-1.8px;line-height:1.3}h1>span:last-child{margin-top:6px}.mobile-line{display:block}.taste-word{letter-spacing:-1px}.taste-word svg{bottom:-5px;height:13px;stroke-width:2.3}.hero-copy>p{font-size:12px;line-height:1.95;margin:27px auto 26px;max-width:310px}.mobile-only{display:block}.hero-actions{gap:19px}.hero-actions>.button{font-size:11px;padding:11px 13px;gap:12px}.hero-actions>.button>.icon{width:15px;height:15px}.hero-actions>.text-link{font-size:11px;gap:7px}.hero-actions>.text-link .icon{width:14px;height:14px}.light-field{top:165px;height:700px;width:1030px;opacity:.7;left:40%}.type-object-a{left:auto;right:-9px;top:67%;width:64px;height:84px;border-radius:3px;opacity:.88}.type-object-a>span{font-size:34px;letter-spacing:-4px}.type-object-b{left:-12px;top:66%;width:53px;height:69px}.type-object-b>span{font-size:35px}.hero-coordinate{font-size:8px}.coordinate-one{top:85%;left:17%;transform:rotate(-7deg)}.coordinate-two{right:14%;top:78%;transform:rotate(5deg)}.hero-orbit{top:220px;right:-450px}.orbit-two{right:-515px;top:150px}.scroll-cue{bottom:18px;gap:10px}.scroll-cue>span{height:23px}.scroll-cue .icon{width:14px;height:14px}.chapter{margin-top:var(--landing-chapter-space)}h2{font-size:var(--landing-type-section);line-height:1.38;letter-spacing:-1.1px}.discovery-section{margin-top:35px}.standards-section{display:flex;flex-direction:column;gap:25px;align-items:stretch}.standards-copy>h2{font-size:var(--landing-type-section);margin-bottom:24px}.standards-copy>p.lead{font-size:16px;margin-bottom:14px}.standards-copy>p{font-size:12px;max-width:315px}.site-footer{display:block;padding-top:26px;padding-bottom:30px;min-height:0}.site-footer>.brand{font-size:21px}.site-footer>div{justify-content:space-between;gap:14px;margin-top:20px;font-size:10px}.guide-content{padding:30px 25px}.guide-content>h2{font-size:29px}.guide-steps{font-size:11px}.prompt-example p{font-size:11px}}
@media(max-width:370px){.hero-copy{padding-top:62px}.hero-copy>p{font-size:11px}.hero-actions{gap:14px}.hero-actions>.button{font-size:10px;padding-inline:11px;gap:8px}.hero-actions>.text-link{font-size:10px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition-duration:0s!important;animation-duration:0s!important}}.standards-copy>h2{font-size:clamp(32px,3.35vw,47px)}.title-phrase{display:inline-block}.standards-copy>p.lead{font-size:15px;line-height:1.95}
@media(max-width:860px){.standards-copy>p.lead{font-size:13px}}
@media(max-width:600px){.standards-copy>h2{font-size:32px}.standards-copy>p.lead{font-size:13px;line-height:1.95}}/* Content sets chapter height; generous padding keeps the groups distinct. */
.hero{min-height:calc(100vh - var(--landing-header-height));min-height:calc(100svh - var(--landing-header-height))}.discovery-section,.standards-section{display:flex;flex-direction:column;justify-content:center;align-items:stretch;gap:0;margin-block:0;min-height:0;padding-block:88px;grid-template-columns:none}.section-panel{width:100%;border-radius:18px;padding:60px;display:grid;grid-template-columns:1.24fr 1fr;gap:68px;align-items:center;min-height:440px}.preference-panel{background:var(--landing-surface-mint)}.section-panel h2,.standards-copy>h2{font-size:var(--landing-expression-size);line-height:1.4;letter-spacing:-1.6px}.accent-word{color:var(--color-accent)}.section-prose>p{font-size:16px;line-height:1.9;color:#5e6a64;margin:0 0 25px}.section-prose>p.section-lead{font-size:18px;font-weight:520;color:var(--color-ink);margin-bottom:16px}.standards-layout{display:grid;grid-template-columns:1.08fr 1fr;gap:72px;align-items:center;width:100%}.standards-copy>h2{margin-bottom:25px}.standards-copy>p,.standards-copy>p.lead{max-width:490px;font-size:15px;line-height:1.95;color:var(--color-subtle);margin:0 0 19px}.standards-copy>p.lead{color:var(--color-ink)}.standards-atlas{margin:0;min-width:0}.standard-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}.standard-tile{border-radius:12px;padding:23px;min-height:139px}.standard-tile h3{font-size:22px;line-height:1.4;font-weight:560;letter-spacing:-.5px;margin:0 0 13px}.standard-tile p{font-size:13px;line-height:1.8;color:#59616d;margin:0}.tile-blue{background:var(--landing-surface-blue)}.tile-peach{background:var(--landing-surface-peach)}.tile-lilac{background:var(--landing-surface-lilac)}.tile-mint{background:var(--landing-surface-mint)}.tile-yellow{background:var(--landing-surface-yellow)}.tile-neutral{background:var(--color-surface)}
@media(max-width:1100px){.section-panel{padding:44px;gap:40px;min-height:420px}.standards-layout{gap:45px}.standard-tile{padding:21px}.section-panel h2,.standards-copy>h2{letter-spacing:-1px}}
@media(max-width:860px){.discovery-section,.standards-section{padding-block:66px}.section-panel{padding:35px;gap:30px}.section-prose>p{font-size:14px}.section-prose>p.section-lead{font-size:16px}.standards-layout{gap:31px;grid-template-columns:1fr 1fr}.standards-copy>p,.standards-copy>p.lead{font-size:13px;line-height:1.9}.standard-tile{padding:18px;min-height:126px}.standard-tile h3{font-size:20px}.standard-tile p{font-size:12px}.standard-grid{gap:10px}}
@media(max-width:600px){.discovery-section,.standards-section{padding-block:38px}.section-panel{padding:30px 25px;min-height:0;display:flex;flex-direction:column;gap:27px;align-items:stretch;border-radius:14px}.section-panel h2,.standards-copy>h2{font-size:32px;line-height:1.45;letter-spacing:-1px}.section-prose>p{font-size:14px;line-height:1.9;margin-bottom:18px}.section-prose>p.section-lead{font-size:15px;margin-bottom:13px}.standards-layout{grid-template-columns:1fr;gap:25px}.standards-copy>h2{margin-bottom:21px}.standards-copy>p,.standards-copy>p.lead{max-width:none;font-size:13px;line-height:1.85;margin-bottom:15px}.standard-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.standard-tile{padding:15px 10px;min-height:104px;border-radius:9px}.standard-tile h3{font-size:18px;margin-bottom:9px}.standard-tile p{font-size:11px;line-height:1.8}}/* Broader design vocabulary,kept as short,equally weighted labels. */
.standards-layout{grid-template-columns:.9fr 1.1fr;gap:70px}.standard-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}.standard-tile{min-height:72px;padding:15px 10px;display:grid;place-items:center;border-radius:10px;text-align:center}.standard-tile h3{font-size:15px;font-weight:520;line-height:1.6;letter-spacing:0;margin:0}
@media(max-width:1100px){.standards-layout{gap:40px}.standard-grid{gap:8px}.standard-tile{padding:12px 7px;min-height:68px}.standard-tile h3{font-size:13px}}
@media(max-width:860px){.standards-layout{grid-template-columns:1fr;gap:32px}.standard-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.standard-tile h3{font-size:15px}}
@media(max-width:600px){.standard-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.standard-tile{min-height:59px;padding:12px 8px}.standard-tile h3{font-size:13px}}
.github-link{display:inline-flex;align-items:center;gap:10px;min-height:44px;padding:9px 0 9px 12px;font-size:14px;font-weight:550}
.github-mark{width:24px;height:24px;fill:currentColor;flex:none}
.github-link>.icon{width:14px;height:14px;color:var(--color-subtle)}
.hero-actions{flex-direction:column;align-items:center;gap:14px}
.install-command{display:flex;align-items:center;gap:12px;width:max-content;max-width:100%;min-height:48px;padding:4px 7px 4px 15px;background:var(--color-surface);color:var(--color-ink);border:1px solid var(--color-border);border-radius:8px;text-align:left}
.terminal-prompt{display:none}
.install-command code{min-width:0;flex:1;white-space:nowrap;overflow-x:auto;scrollbar-width:thin;font:13px/1.8 var(--font-mono);padding-block:6px;outline-offset:2px}
.install-command code:focus-visible{outline:2px solid var(--color-accent)}
.copy-install{display:grid;place-items:center;flex:none;width:34px;height:34px;padding:0;border:0;border-radius:5px;background:transparent;color:var(--color-accent)}
.copy-install>.icon{width:17px;height:17px}
.install-hint{font-size:11px;line-height:1.8;color:var(--color-subtle);margin:0}
.install-hint button{border:0;background:none;padding:0;font:inherit;text-decoration:underline;text-underline-offset:3px;color:var(--color-ink)}
.install-section{padding-block:64px 88px}
.install-panel{padding:64px 40px;text-align:center;background:var(--landing-surface-blue);border-radius:18px}
.install-panel h2{font-size:var(--landing-expression-size);line-height:1.4;letter-spacing:-1.5px;margin:0}
.install-panel>p{font-size:15px;line-height:1.9;color:var(--color-subtle);margin:18px 0 30px}
.install-panel .install-command{margin-inline:auto;background:var(--color-canvas)}
.install-help{display:inline-flex;align-items:center;gap:8px;font-size:12px;background:transparent;border:0;padding:10px 0;margin-top:13px}
.install-help>.icon{width:15px;height:15px}
.guide-steps code{overflow-wrap:anywhere}
@media(hover:hover) and (pointer:fine){.github-link:hover,.install-help:hover{color:var(--color-accent)}.copy-install:hover{background:var(--color-accent-soft);color:var(--color-accent)}}
@media(max-width:860px){.install-section{padding-block:44px 66px}.install-panel{padding:52px 30px}.install-panel h2{font-size:36px}.github-link{font-size:13px}}
@media(max-width:600px){.github-link{font-size:12px;gap:8px}.github-mark{width:22px;height:22px}.github-link>.icon{display:none}.hero-actions{gap:12px}.install-command{min-height:44px;gap:10px;padding:4px 6px 4px 12px}.install-command code{font-size:12px}.terminal-prompt{font-size:12px}.copy-install{width:30px;height:32px}.install-hint{font-size:11px}.install-section{padding-block:30px 38px}.install-panel{padding:39px 14px;border-radius:14px}.install-panel h2{font-size:29px;letter-spacing:-1px}.install-panel>p{font-size:12px;margin:14px 0 24px}.install-help{font-size:11px;margin-top:12px}}
@media(max-width:370px){.install-command code{white-space:normal;overflow-wrap:anywhere}}
.section-prose>p:last-child{margin-bottom:0}
.continuity-section{margin-block:0;padding-block:72px;text-align:center}
.continuity-copy{max-width:820px;margin-inline:auto}
.continuity-copy h2{font-size:var(--landing-expression-size);line-height:1.4;letter-spacing:-1.3px}
.continuity-copy p{max-width:620px;margin:24px auto 0;font-size:15px;line-height:1.95;color:var(--color-subtle)}
@media(max-width:860px){.continuity-section{padding-block:56px}.continuity-copy p{max-width:560px;font-size:14px}}
@media(max-width:600px){.continuity-section{padding-block:38px}.continuity-copy h2{font-size:clamp(28px,8vw,32px);letter-spacing:-1px}.continuity-copy p{font-size:13px;line-height:1.9;margin-top:20px}}
.standards-copy>p:last-child{margin-bottom:0}
/* Language controls share the existing header; longer translations can reflow. */
.header-actions{display:flex;align-items:center;gap:22px;min-width:0}
.language-picker{display:grid;place-items:center;flex:none;width:44px;height:44px;padding:0;border:0;border-radius:50%;background:transparent;color:var(--color-subtle);cursor:pointer;transition:background var(--motion-press)}
.language-picker:disabled{cursor:default;opacity:.55}
.language-picker>.icon{width:18px;height:18px;pointer-events:none}
.standard-tile{min-width:0}
html:not(:lang(zh)) h1{font-size:clamp(42px,5.1vw,72px);line-height:1.15;letter-spacing:-2.5px;text-wrap:balance;max-width:1120px;margin-inline:auto}
html:not(:lang(zh)) .hero-copy{padding-bottom:140px}
html:not(:lang(zh)) .hero-copy>p{max-width:750px}
html:not(:lang(zh)) .taste-word{letter-spacing:inherit}
html:not(:lang(zh)) .title-phrase{display:inline}
html:not(:lang(zh)) h2{overflow-wrap:anywhere;hyphens:auto;text-wrap:balance}
html:not(:lang(zh)) .standard-tile h3{overflow-wrap:anywhere;hyphens:auto;line-height:1.45}
html:not(:lang(zh)) .install-panel h2{max-width:820px;margin-inline:auto}
.site-footer>div{flex-wrap:wrap}
@media(max-width:600px){
.header-actions{gap:16px}
.header-actions .github-link{padding:0;min-height:44px}
.header-actions .github-link>span{display:none}
html:not(:lang(zh)) h1{font-size:clamp(34px,8.5vw,48px);letter-spacing:-1.2px;line-height:1.2}
html:not(:lang(zh)) .hero-copy{padding-top:66px;padding-bottom:150px}
html:not(:lang(zh)) .hero-copy>p{font-size:13px;max-width:400px}
html:not(:lang(zh)) .hero-copy>p br{display:none}
html:not(:lang(zh)) .standard-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
html:not(:lang(zh)) .site-footer>div{column-gap:20px;row-gap:14px;justify-content:flex-start}
}
.thesis-section{padding-block:64px 32px;text-align:center}
.thesis-copy{max-width:820px;margin-inline:auto}
.thesis-copy h2{font-size:var(--landing-expression-size);line-height:1.4;letter-spacing:-1.3px;text-wrap:balance}
.thesis-copy h2>span{display:block}
.thesis-copy p{max-width:640px;margin:24px auto 0;font-size:15px;line-height:1.95;color:var(--color-subtle)}
@media(max-width:860px){.thesis-section{padding-block:52px 24px}.thesis-copy p{max-width:560px;font-size:14px}}
@media(max-width:600px){.thesis-section{padding-block:38px 12px}.thesis-copy h2{font-size:clamp(22px,6.7vw,32px);letter-spacing:-.7px}.thesis-copy p{font-size:13px;line-height:1.9;margin-top:20px}}
/* A direct language menu, anchored to the globe button. */
.language-menu{position:fixed;inset:auto;margin:0;width:224px;max-width:calc(100vw - 32px);padding:4px;border:1px solid var(--color-border);border-radius:8px;background:var(--color-canvas);color:var(--color-ink);box-shadow:0 8px 28px #202b241f;overflow:auto;font-size:14px;line-height:20px}
.language-menu:popover-open{animation:language-menu-enter var(--motion-state) var(--motion-ease) both}
.language-menu.is-closing{animation:language-menu-exit var(--motion-press) var(--motion-ease) both}
.language-menu[data-instant]{animation:none}
.language-menu button{position:relative;display:flex;align-items:center;width:100%;min-height:32px;padding:6px 32px 6px 8px;border:0;border-radius:6px;background:transparent;text-align:left;font-size:14px;line-height:20px;outline:none}
.language-menu button:focus{background:var(--color-surface)}
.language-menu .icon{position:absolute;right:8px;width:16px;height:16px;visibility:hidden}
.language-menu [aria-selected=true] .icon{visibility:visible}
.language-option-separator{height:1px;margin:4px -4px;background:var(--color-border)}
@media(hover:hover) and (pointer:fine){.language-picker:hover,.language-menu button:hover{background:var(--color-surface)}}
@keyframes language-menu-enter{from{opacity:0;transform:scale(.97)}to{opacity:1;transform:scale(1)}}
@keyframes language-menu-exit{from{opacity:1;transform:scale(1)}to{opacity:0;transform:scale(.97)}}
@media(prefers-reduced-motion:reduce){.language-menu{animation:none!important}}