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@media (min-width:1550px){.hero-panel{height:382px}.hero-copy h1{font-size:54px}}
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/* One drawing system: outline, fine construction lines and two spot colors. */
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html[data-theme=dark]{--art-ink:#9cbfe0;--art-secondary:#8ebeb0;--art-accent:#e0b084;--art-faint:#4a657b;--art-paper:#263c52}
.line-illustration{fill:none;stroke:var(--art-ink);stroke-width:1.65;stroke-linecap:round;stroke-linejoin:round}
.line-illustration :is(path,circle,ellipse,rect){vector-effect:non-scaling-stroke}
.line-illustration .construction{stroke:var(--art-faint);stroke-width:1;fill:none}
.line-illustration .detail{stroke-width:1.05}
.line-illustration .curve{stroke-width:2.35}
.line-illustration .accent{stroke:var(--art-accent)}
.line-illustration .secondary{stroke:var(--art-secondary)}
.line-illustration .paper{fill:var(--art-paper)}
.line-illustration .under-stroke{stroke:var(--art-paper);stroke-width:7}
.line-illustration .figure-text{fill:var(--art-ink);stroke:none;font:10px 'Segoe UI','Microsoft YaHei',sans-serif}
.hero-art{--art-ink:#c0d8eb;--art-secondary:#82b1bc;--art-accent:#e5b17f;--art-faint:#45627b;--art-paper:#19324b}
.hero-art .line-illustration{stroke-width:1.4}
.hero-art .line-illustration .construction{stroke-width:.85}
.hero-art .line-illustration .detail{stroke-width:.8}
.pid-visual{--art-paper:#e8f0fd}
.kalman .compact-visual,.control-cover,.life-card:first-child .life-art{--art-ink:#4f8075;--art-faint:#adc8be;--art-paper:#e5f0ea}
.motor .compact-visual{--art-ink:#6c7b87;--art-faint:#c8c8bf;--art-paper:#eee9e1}
.life-card:last-child .life-art{--art-ink:#967652;--art-paper:#f1eade;--art-faint:#d4c5b1;--art-accent:#a16c42}
html[data-theme=dark] .pid-visual{--art-paper:#213856}
html[data-theme=dark] .kalman .compact-visual,html[data-theme=dark] .control-cover,html[data-theme=dark] .life-card:first-child .life-art{--art-ink:#9fc8ba;--art-faint:#4c7166;--art-paper:#29463f}
html[data-theme=dark] .motor .compact-visual{--art-ink:#b7c5cd;--art-faint:#677774;--art-paper:#343939}
html[data-theme=dark] .life-card:last-child .life-art{--art-ink:#d0b496;--art-faint:#746757;--art-paper:#3c3935;--art-accent:#dfb181}

/* Homepage opening illustration: spacious landscape and a single flight motif. */
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.atmosphere-art .distant-sun{fill:#d5b58b;fill-opacity:.88;stroke:none}
.atmosphere-art .ridge-back{stroke:#648598;stroke-width:1.2;fill:none}
.atmosphere-art .ridge-front{stroke:#83aaa9;stroke-width:1.35;fill:none}
.atmosphere-art .flight-trace{stroke:#ddb183;stroke-width:1.7;fill:none}
.atmosphere-art .wing-surface{stroke:#d6e6f0;fill:#25475e;stroke-width:1.8}
.atmosphere-art .airframe-fold{stroke:#8fb4c7;stroke-width:1.1}
.atmosphere-art .paper-accent{stroke:#ddb183;stroke-width:1.5}
.atmosphere-art .paper-horizon{stroke:#608c9b;stroke-width:1.15;fill:none}
.atmosphere-art .air-stream{stroke:#7397a8;stroke-width:1.15;fill:none}
@media(max-width:760px){.hero-art:has(.atmosphere-art){width:108%;right:-4%;height:226px;bottom:6px}}