/* LessonSky RC117: compact theme switch, premium landing and interactive learning; no external assets. */
.sk117-quick-theme{position:fixed;right:max(16px,env(safe-area-inset-right));bottom:max(22px,env(safe-area-inset-bottom));z-index:100100;pointer-events:none}
.sk117-quick-theme button{pointer-events:auto;display:flex;align-items:center;gap:9px;border:1px solid rgba(91,117,181,.38);border-radius:999px;background:#fff;color:#102449;padding:11px 15px;min-height:46px;box-shadow:0 14px 44px rgba(15,35,70,.24);font-size:13px;font-weight:700;line-height:1.2;font-family:inherit;cursor:pointer;backdrop-filter:blur(18px)}
.sk117-quick-theme button:focus-visible{outline:3px solid #e8b04c;outline-offset:3px}
.sk117-quick-theme button [data-sk117-theme-icon]{font-size:21px;line-height:1}
.sk117-quick-theme button:disabled{opacity:.5;cursor:wait}
html.lessonsky-dark .sk117-quick-theme button,body.lessonsky-dark .sk117-quick-theme button{background:#1b2944;color:#fff;border-color:#5873a3}
@media(max-width:780px){.sk117-quick-theme{bottom:auto;top:calc(9px + env(safe-area-inset-top));right:calc(10px + env(safe-area-inset-right))}.sk117-quick-theme button{font-size:12px;padding:8px 11px;min-height:38px;box-shadow:0 6px 21px rgba(12,22,44,.27)}}
.sk117-home-features{max-width:1250px;margin:36px auto;padding:30px 24px;color:#172a49;font-family:inherit;box-sizing:border-box}.sk117-home-features *{box-sizing:border-box}.sk117-home-top{display:flex;align-items:center;justify-content:space-between;gap:28px}.sk117-home-top h2{font-size:clamp(29px,4vw,51px);letter-spacing:-.045em;line-height:1.08;margin:12px 0;color:#142548}.sk117-home-top p{font-size:16px;color:#576883;max-width:710px;line-height:1.65}.sk117-eyebrow{display:block;font-size:11px;font-weight:800;letter-spacing:.14em;color:#3961ce}.sk117-home-actions,.sk117-app-buttons{display:flex;gap:9px;flex-wrap:wrap}.sk117-btn,.sk117-app-buttons a{display:inline-flex;align-items:center;justify-content:center;min-height:43px;padding:10px 16px;border:1px solid #bdc8df;border-radius:13px;color:#193968;background:#fff!important;text-decoration:none!important;font-weight:800;font-size:13px}.sk117-btn.primary,.sk117-app-buttons a:first-child{background:#2856d9!important;color:#fff!important;border-color:#2856d9}.sk117-feature-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:26px}.sk117-feature{padding:23px;border-radius:23px;border:1px solid #dfe6f5;background:linear-gradient(145deg,#fff,#f3f7ff);box-shadow:0 10px 30px rgba(21,43,88,.055);min-width:0}.sk117-feature>span{display:inline-flex;align-items:center;justify-content:center;height:40px;width:40px;border-radius:12px;background:#dfe9ff;color:#2047a1;font-size:22px}.sk117-feature h3{font-size:18px;color:#152b52;margin:14px 0 6px}.sk117-feature p{font-size:14px;color:#4d5e7a;line-height:1.55;margin:0}.sk117-app-rail{display:flex;align-items:center;justify-content:space-between;gap:25px;margin-top:17px;padding:23px;border-radius:22px;background:linear-gradient(120deg,#122449,#173e83);color:#fff}.sk117-app-rail strong{color:#fff;font-size:17px}.sk117-app-rail p{max-width:720px;color:#d9e8ff;line-height:1.55;font-size:13px;margin:6px 0 0}.sk117-app-buttons{min-width:280px;justify-content:flex-end}.sk117-app-buttons a{border-color:#809ad0;background:rgba(255,255,255,.11)!important;color:#fff!important}.sk117-app-buttons a:first-child{background:#e9f0ff!important;color:#18356f!important;border-color:#e9f0ff}
.sk117-skill-lab{padding:26px!important;border-radius:25px!important;background:linear-gradient(145deg,#f4f8ff,#fff);border:1px solid #cad8f1}.sk117-skill-lab h2{margin:8px 0;font-size:clamp(22px,3vw,30px);color:#15315a}.sk117-skill-lab header p{color:#4b5f7b;line-height:1.6}.sk117-map-center{text-align:center;margin:24px auto 10px;max-width:270px;padding:18px 16px;border-radius:18px;background:#204ac5;color:#fff;box-shadow:0 12px 28px rgba(32,74,197,.25)}.sk117-map-center strong,.sk117-map-center small{display:block;color:#fff}.sk117-map-center small{opacity:.78;font-size:12px;margin-top:5px}.sk117-map-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:11px;position:relative}.sk117-map-node{min-width:0;text-align:left;padding:13px;border:1px solid #cddbf6;background:#fff;border-radius:16px;color:#213759;display:flex;gap:6px;flex-direction:column;cursor:pointer}.sk117-map-node span{display:grid;place-items:center;width:30px;height:30px;border-radius:9px;background:#e8eeff;color:#244fc3;font-weight:900}.sk117-map-node strong{font-size:14px}.sk117-map-node small{color:#566782;font-size:12px}.sk117-map-node.is-selected,.sk117-map-node:hover{border-color:#3562dd;box-shadow:0 5px 15px rgba(26,53,115,.11)}.sk117-map-node:focus-visible,.sk117-lab-options button:focus-visible{outline:3px solid #eab251;outline-offset:2px}.sk117-map-detail{padding:14px 18px;background:#eaf1ff;border-radius:14px;color:#183967;line-height:1.65;min-height:58px}.sk117-lab-quiz{margin-top:22px;padding:22px;border-radius:19px;background:#fff;border:1px solid #dce5f5}.sk117-lab-quiz h3{color:#172c4b;font-size:20px;margin:6px 0 15px}.sk117-lab-options{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.sk117-lab-options button{border:1px solid #bdccea;border-radius:13px;background:#f3f7ff;color:#233f70;padding:13px 12px;min-height:52px;font-weight:700;cursor:pointer}.sk117-lab-options button:hover{border-color:#3560cf}.sk117-lab-options button.is-correct{border-color:#18815b;background:#e8f8ef;color:#12523b}.sk117-lab-options button.is-wrong{border-color:#c66b43}.sk117-lab-quiz [data-sk117-result]{margin:12px 0 0;min-height:32px;color:#425777}.sk117-lab-quiz [data-sk117-result].is-correct{color:#13764a}.sk117-lab-quiz [data-sk117-result].is-wrong{color:#ad4c27}
html.lessonsky-dark .sk117-home-features,body.lessonsky-dark .sk117-home-features{color:#eaf2ff}html.lessonsky-dark .sk117-home-top h2,html.lessonsky-dark .sk117-feature h3{color:#f1f5ff}html.lessonsky-dark .sk117-home-top p,html.lessonsky-dark .sk117-feature p{color:#d1def4}html.lessonsky-dark .sk117-feature{background:linear-gradient(135deg,#1b2b47,#1c3154);border-color:#3a517a}html.lessonsky-dark .sk117-skill-lab,body.lessonsky-dark .sk117-skill-lab{background:linear-gradient(135deg,#1a2a43,#132239);border-color:#3a537b}html.lessonsky-dark .sk117-skill-lab h2,html.lessonsky-dark .sk117-lab-quiz h3{color:#eff4ff}html.lessonsky-dark .sk117-skill-lab header p{color:#d7e2f5}html.lessonsky-dark .sk117-map-node,html.lessonsky-dark .sk117-lab-quiz{background:#1d304e;color:#e9f1ff;border-color:#4b6389}html.lessonsky-dark .sk117-map-node small{color:#c5d6ee}html.lessonsky-dark .sk117-map-detail{background:#233b5d;color:#eff5ff}html.lessonsky-dark .sk117-lab-options button{background:#233b5d;border-color:#5679ad;color:#e7f1ff}html.lessonsky-dark .sk117-lab-quiz [data-sk117-result]{color:#d7e4ff}html.lessonsky-dark .sk117-lab-quiz [data-sk117-result].is-correct{color:#91edba}
@media(max-width:940px){.sk117-home-top,.sk117-app-rail{flex-direction:column;align-items:flex-start}.sk117-feature-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.sk117-app-buttons{justify-content:flex-start}.sk117-map-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:580px){.sk117-home-features{padding:14px 10px;margin:20px auto}.sk117-feature-grid{grid-template-columns:1fr;gap:10px}.sk117-app-rail{padding:18px}.sk117-skill-lab{padding:17px!important}.sk117-map-grid{grid-template-columns:1fr 1fr}.sk117-lab-options{grid-template-columns:1fr}.sk117-map-node{padding:11px}}

/* Thirty unique visual infographics tied to domain learning, not random percentages. */
.sk117-infographic{margin-top:20px;padding:22px;border:1px solid #cbdcf2;border-radius:20px;background:linear-gradient(135deg,#edf7ff,#e9eeff)}
.sk117-infographic h3{color:#172f57;margin:6px 0;font-size:21px}.sk117-infographic>div>p{margin:0;color:#506484}
.sk117-infographic-steps{padding:0;margin:17px 0 0;list-style:none;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.sk117-infographic-steps li{display:flex;gap:10px;align-items:flex-start;min-width:0;background:rgba(255,255,255,.90);border:1px solid #c8d7ee;border-radius:14px;padding:14px}
.sk117-infographic-index{flex:none;width:32px;height:32px;border-radius:50%;display:grid;place-items:center;background:#2854b5;color:#fff;font-weight:900}
.sk117-infographic-steps strong{color:#173961;display:block;font-size:13px}.sk117-infographic-steps p{color:#495e7d;margin:6px 0 0;font-size:12px;line-height:1.5}
html.lessonsky-dark body .sk117-infographic{background:linear-gradient(135deg,#243856,#1b2f4e);border-color:#5877a1}
html.lessonsky-dark body .sk117-infographic h3{color:#f2f7ff}
html.lessonsky-dark body .sk117-infographic>div>p{color:#cbdcf4}
html.lessonsky-dark body .sk117-infographic-steps li{background:#1b2d4b;border-color:#4a6b98}
html.lessonsky-dark body .sk117-infographic-steps strong{color:#f2f7ff}
html.lessonsky-dark body .sk117-infographic-steps p{color:#d3e0f4}
/* Rich, readable dark mode for the public application download hub. */
.ls-app-signup{display:flex;gap:25px;align-items:center;justify-content:space-between;margin:21px 0 32px;padding:23px 27px;background:linear-gradient(115deg,#e7f4ff,#eaf0ff);border:1px solid #c9d8f0;border-radius:23px}
.ls-app-signup h2{font-size:clamp(21px,3vw,26px);color:#173157;margin:8px 0}
.ls-app-signup p{margin:0;font-size:13px;color:#405878;line-height:1.65;max-width:730px}
.ls-app-signup-actions{display:flex;gap:12px;align-items:center;flex-wrap:wrap;flex:none}
html.lessonsky-dark body .ls-app-center{color:#e6efff}
html.lessonsky-dark body .ls-app-hero{background:radial-gradient(circle at 75% 15%,rgba(77,118,229,.22),transparent 35%),linear-gradient(145deg,#172841,#1a304e);border-color:#4c658a}
html.lessonsky-dark body .ls-app-hero h2,
html.lessonsky-dark body .ls-app-section-head h2,
html.lessonsky-dark body .ls-app-card h3,
html.lessonsky-dark body .ls-app-value-grid h3,
html.lessonsky-dark body .ls-app-steps strong,
html.lessonsky-dark body .ls-app-qr-block strong{color:#f1f7ff}
html.lessonsky-dark body .ls-app-hero p,
html.lessonsky-dark body .ls-app-section-head>p,
html.lessonsky-dark body .ls-app-card>p,
html.lessonsky-dark body .ls-app-value-grid p,
html.lessonsky-dark body .ls-app-steps span,
html.lessonsky-dark body .ls-app-qr-block span{color:#d2dfef}
html.lessonsky-dark body .ls-app-trust-pills span,
html.lessonsky-dark body .ls-app-card,
html.lessonsky-dark body .ls-app-card.is-soon,
html.lessonsky-dark body .ls-app-value-grid article,
html.lessonsky-dark body .ls-app-steps li{background:#1b2c49;border-color:#4c6384;color:#e8f2ff}
html.lessonsky-dark body .ls-app-meta span{background:#2b3e5d;color:#e4efff}
html.lessonsky-dark body .ls-app-steps{background:#182a43;border-color:#4f6788}
html.lessonsky-dark body .ls-app-details{border-color:#4f6788}
html.lessonsky-dark body .ls-app-details summary,
html.lessonsky-dark body .ls-app-details small{color:#bdd2eb}
html.lessonsky-dark body .ls-app-details code{background:#273b57;color:#e9f1ff}
html.lessonsky-dark body .ls-app-signup{background:linear-gradient(115deg,#263c59,#1b304e);border-color:#5a7297}
html.lessonsky-dark body .ls-app-signup h2{color:#eff5ff}
html.lessonsky-dark body .ls-app-signup p{color:#d2e0f2}
html.lessonsky-dark body .ls-app-signup .ls-app-text-link{color:#acdbff}
html.lessonsky-dark body .ls-app-public-notice{color:#d7e5f7}
html.lessonsky-dark body .ls-app-install-help{color:#c7dafa}
/* Contrast and responsive spacing for site-wide switch + visual learning. */
.sk117-home-features a:focus-visible,.ls-app-signup a:focus-visible{outline:3px solid #f4bd5a;outline-offset:3px}
@media(max-width:940px){.ls-app-signup{align-items:flex-start;flex-direction:column}.sk117-infographic-steps{grid-template-columns:1fr}}
@media(max-width:780px){body.admin-bar .sk117-quick-theme{top:calc(57px + env(safe-area-inset-top))}}
@media(max-width:580px){.ls-app-signup{padding:17px}.sk117-infographic{padding:16px}.sk117-infographic-steps li{padding:12px}.sk117-quick-theme{z-index:7000}}

.sk117-guided-case{margin:14px 0;padding:14px 16px;background:#ecf3ff;border:1px solid #c5d5ee;border-radius:14px}
.sk117-guided-case summary{color:#234779;font-weight:800;cursor:pointer}
.sk117-guided-case strong{display:block;color:#18365d;margin-top:10px}
.sk117-guided-case p{color:#405775;line-height:1.6;margin:3px 0 8px}
.sk117-language-notice{padding:14px 17px;background:#fff8e9;border:1px solid #e7c995;border-radius:13px;color:#644516;font-size:14px;line-height:1.6}
.sk117-audio-note{display:block;margin:6px 0 10px;color:#496582;line-height:1.5}
[data-sk-language-tts-status][data-state="error"]{display:block;color:#ae3e28;font-weight:800}
[data-sk-language-tts-status][data-state="playing"],[data-sk-language-tts-status][data-state="done"]{display:block;color:#197b53;font-weight:700}
html.lessonsky-dark body .sk117-guided-case{background:#1d314e;border-color:#55739b}
html.lessonsky-dark body .sk117-guided-case summary,html.lessonsky-dark body .sk117-guided-case strong{color:#e5f2ff}
html.lessonsky-dark body .sk117-guided-case p{color:#cfdef3}
html.lessonsky-dark body .sk117-language-notice{background:#3f3426;border-color:#8a744f;color:#fff0cb}
html.lessonsky-dark body .sk117-audio-note{color:#c6dafa}
html.lessonsky-dark body [data-sk-language-tts-status][data-state="error"]{color:#ffab9d}
html.lessonsky-dark body [data-sk-language-tts-status][data-state="playing"],html.lessonsky-dark body [data-sk-language-tts-status][data-state="done"]{color:#96ecc8}