.home-page{min-height:100dvh;display:flex;flex-direction:column;background:var(--bg)}
.home-page [hidden]{display:none!important}.mode-options{margin:0 0 26px;padding:0;border:0}.mode-options legend{font-size:14px;color:#a8c5bd;margin-bottom:12px}.mode-options-grid{display:grid;grid-template-columns:1fr 1fr;gap:13px}.mode-options-grid label{display:flex;align-items:center;gap:12px;padding:17px 20px;border:1px solid #34514a;border-radius:7px;background:#142622;cursor:pointer}.mode-options-grid label:has(input:checked){border-color:#83edc5;background:#1c3930}.mode-options-grid input{accent-color:#83edc5}.mode-options-grid span{display:grid;gap:6px}.mode-options-grid strong{font-size:17px;font-weight:600}.mode-options-grid small{font-size:14px;color:#9eb8b0}.ground-intro{padding:26px;border:1px solid #345650;border-radius:8px;background:#11282a}.ground-intro-heading{display:flex;align-items:center;gap:15px;margin-bottom:15px}.ground-intro-heading>span{font:14px ui-monospace,monospace;color:#83edc5;border:1px solid #467665;padding:9px;border-radius:5px}.ground-intro h2{font-size:21px;line-height:1.4}.ground-intro p{font-size:16px;line-height:1.75;color:#b2c8c4}.ground-intro #ground-intro-note{font-size:14px;color:#809f97;margin-top:17px}@media(max-width:650px){.mode-options-grid{grid-template-columns:1fr}.ground-intro{padding:20px}.ground-intro-heading{align-items:flex-start}.ground-intro h2{font-size:19px}}
.home-header{flex-shrink:0;padding-inline:max(28px,calc((100vw - 1120px)/2));justify-content:space-between;gap:20px}
.home-location{font-family:var(--mono);font-size:.75rem;letter-spacing:.08em;color:#9db0b3;white-space:nowrap}
.home-location span{color:#4d6667;margin:0 9px}
.home-main{width:min(100%,1080px);margin:auto;padding:42px 28px 30px}
.home-intro{max-width:700px;margin-bottom:29px}
.home-eyebrow{color:var(--mint);font-family:var(--mono);font-size:.75rem;letter-spacing:.13em;margin-bottom:15px}
.home-intro h1{font-size:clamp(2rem,3.5vw,2.75rem);font-weight:520;letter-spacing:-.04em;line-height:1.15;text-wrap:balance}
.home-intro h1 span{color:var(--mint)}
.home-lead{font-size:1rem;color:#a9bcbf;line-height:1.65;max-width:600px;margin-top:15px;text-wrap:pretty}
.concepts{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:22px}
.concept-card{background:var(--surface);border:1px solid #314341;border-radius:7px;padding:24px 25px 20px;min-width:0;display:flex;flex-direction:column}
.concept-topline{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:13px}
.concept-code{font-family:var(--mono);color:var(--mint);font-size:.875rem;font-weight:550;letter-spacing:.07em}
.concept-stage{font-family:var(--mono);font-size:.75rem;color:#8da5a4;letter-spacing:.06em;white-space:nowrap}
.concept-stage span{color:#4e6762;margin-inline:5px}
.concept-card h2{font-size:1.25rem;font-weight:550;letter-spacing:-.015em;margin-bottom:12px;line-height:1.35}
.concept-card>p:not(.concept-takeaway){font-size:1rem;color:#b4c3c6;line-height:1.65;text-wrap:pretty;flex:1}
.concept-card strong{color:#dfeae8;font-weight:550}
.concept-card .concept-diagram{display:block;width:100%;height:auto;min-height:105px;max-height:145px;flex-shrink:0;margin:20px 0 16px;border-radius:3px;background:#0c171a;stroke-linecap:round;stroke-linejoin:round;overflow:visible}
.concept-diagram text{font-family:var(--mono);font-size:16px;fill:#95ada9;stroke:none;letter-spacing:.02em}
.concept-diagram .diagram-highlight{fill:#a1d4b5}
.diagram-route{stroke:#7eac91;stroke-width:1.4;stroke-dasharray:5 5;fill:none}
.diagram-fix{stroke:#a1d4b5;stroke-width:1.2;fill:#0c171a}
.concept-card .concept-takeaway{border-top:1px solid #2b3c39;padding-top:15px;font-size:.875rem;line-height:1.6;color:#9fb7b0}
.concept-takeaway>span{display:block;font-family:var(--mono);font-size:.75rem;letter-spacing:.065em;color:#7da592;margin-bottom:6px}
.home-action{display:flex;flex-direction:column;align-items:center;text-align:center;margin-top:28px;gap:13px}
.try-button{display:inline-flex;align-items:center;justify-content:center;gap:23px;border:1px solid #85e8bd;border-radius:5px;background:var(--mint);color:#122b1f;min-height:51px;padding:14px 26px;font-size:1rem;font-weight:600;transition:background .15s ease,box-shadow .15s ease;text-decoration:none}
.try-button:hover{background:#a1f0ce;box-shadow:0 4px 22px #85e8bd15}
.try-button:focus-visible{outline:2px solid var(--mint);outline-offset:5px}
.try-button svg{width:19px;height:19px;stroke-width:1.8}
.home-action>p{font-size:.875rem;line-height:1.6;color:#8ba4a3}
.home-footer{border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;padding:17px max(28px,calc((100vw - 1120px)/2));font-size:.75rem;line-height:1.6;color:#809998;margin-top:auto}
.home-footer a{color:#abc4bb;text-decoration:underline;text-decoration-color:#526d61;text-underline-offset:3px}
.home-footer a:hover{color:var(--mint)}
.home-footer>span:last-child{white-space:nowrap}
@media(max-width:900px){.concept-diagram text{font-size:21px}.home-page .brand-light{display:inline;font-size:inherit!important;letter-spacing:inherit;margin-left:7px}.home-main{padding:32px 22px 28px}.concepts{gap:16px}.concept-card{padding:22px 21px 19px}.home-intro{margin-bottom:24px}.home-header{padding-inline:22px}.home-footer{padding-inline:22px}}
@media(max-width:650px){.home-header{height:70px;padding-inline:20px}.home-location{font-size:.75rem}.home-page .brand{font-size:.875rem;letter-spacing:.09em;gap:8px}.home-page .brand-light{display:block;font-size:.75rem!important;letter-spacing:.14em;margin-left:0;margin-top:3px}.home-main{padding:31px 20px 30px}.home-intro h1{font-size:2rem;max-width:400px}.home-intro{margin-bottom:25px}.home-lead{font-size:1rem}.concepts{grid-template-columns:1fr;gap:17px}.concept-card{padding:22px 23px 21px}.concept-card h2{font-size:1.25rem}.concept-card .concept-diagram{margin-top:17px}.concept-diagram text{font-size:18px}.home-action{margin-top:26px;gap:12px}.try-button{width:100%;max-width:370px;padding:15px 16px}.home-action>p{max-width:300px}.home-footer{padding:17px 20px;justify-content:center;text-align:center;gap:7px}}
@media(max-width:380px){.home-header{gap:12px}.home-location{font-size:.75rem;letter-spacing:0}.home-location span{margin-inline:4px}.home-main{padding-inline:16px}.concept-card{padding-inline:19px}.concept-stage{letter-spacing:0}.concept-topline{gap:10px}.home-eyebrow{letter-spacing:.075em}.concept-diagram text{font-size:22px}.concept-card .concept-diagram{min-height:95px}}
.language-control{display:flex;gap:10px;align-items:center;margin-left:auto;color:#b4c9be;font-size:.875rem}.language-control select{background:#182a23;border:1px solid #486955;border-radius:4px;color:#ddf5e7;padding:8px 10px;font:inherit}.difficulty-options{border:1px solid #3b5146;border-radius:7px;margin:28px 0 0;padding:20px;min-width:0}.difficulty-options legend{color:#ccebd9;padding:0 8px;font-size:1rem;font-weight:600}.difficulty-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.difficulty-grid label{display:grid;grid-template-columns:18px 1fr;align-content:start;gap:7px 10px;padding:16px;border:1px solid #3a4c43;border-radius:5px;cursor:pointer;background:#15201c;line-height:1.6}.difficulty-grid label:has(input:checked){border-color:var(--mint);background:#213a2d}.difficulty-grid input{accent-color:var(--mint);margin:5px 0}.difficulty-grid strong{font-size:1rem}.difficulty-grid span{grid-column:1/-1;font-size:.875rem;color:#b3c8bc;line-height:1.65}.difficulty-options>p{font-size:.8125rem;color:#91a99c;line-height:1.7;margin-top:15px}.language-control:focus-within{outline:2px solid var(--mint);outline-offset:3px}@media(max-width:650px){.home-header{height:auto;flex-wrap:wrap;padding-block:15px}.home-location{display:none}.difficulty-grid{grid-template-columns:1fr}.difficulty-options{padding:15px}.language-control{font-size:.8125rem;gap:6px}}

.environment-options summary{cursor:pointer;color:#ccebd9;font-weight:600}.environment-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:18px 0}.environment-grid label{display:grid;gap:8px;font-size:14px;color:#c4d9d0}.environment-grid select{width:100%;font:inherit;padding:10px;background:#182820;color:#d9eee5;border:1px solid #466456;border-radius:5px}.environment-options .info-note{font-size:14px;line-height:1.7;color:#a8c0b4}@media(max-width:650px){.environment-grid{grid-template-columns:1fr}}