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@media(max-width:1050px){nav{gap:14px;font-size:13px}.solution-grid{grid-template-columns:1fr 1fr}.auth-layout{gap:40px}.hero{gap:30px}.hero-art svg{width:180px;height:180px}.hero-art{min-height:360px}}
@media(max-width:800px){header{flex-wrap:wrap}.menu-toggle{display:block;margin-left:auto}nav{display:none;width:100%;flex-direction:column;align-items:stretch;gap:0;padding-bottom:5px}nav.open{display:flex}nav a{display:block;padding:14px 10px}nav .nav-method,nav .nav-ext{display:block!important}nav .login-open{display:block;margin-top:8px;text-align:center}.hero{grid-template-columns:1fr;padding:40px 0;gap:30px}.hero-art{min-height:280px}.hero-art svg{width:155px;height:155px}.hero-art:before{width:250px;height:250px}.hero-art:after{width:330px;height:170px}.auth-layout{grid-template-columns:1fr;gap:25px;padding:40px 0}.auth-copy h1{font-size:44px}.auth-copy .brand-symbol{display:none}.stage-legend{grid-template-columns:1fr;gap:0}.page-title{font-size:43px}.solution-grid{grid-template-columns:1fr}.brand-showcase{padding:30px;min-height:180px}.projects,.service-method,.academy,.extensions,.solutions,.brand-page{padding:40px 0}.home-links{padding:45px 0}.home-links .card{min-height:220px}}

.study-header{padding:50px 0 35px}.study-header .lead{max-width:800px}.study-meta{display:flex;gap:12px;flex-wrap:wrap;color:var(--muted);font-size:13px}.study-meta span{border:1px solid var(--line);padding:8px 12px;border-radius:30px}.study-layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:45px;padding:20px 0 80px}.study-sidebar{position:sticky;top:25px;align-self:start;border:1px solid var(--line);border-radius:16px;padding:22px}.study-sidebar nav{display:flex!important;flex-direction:column;gap:8px;align-items:stretch;font-size:14px}.study-sidebar nav button{background:transparent;color:var(--muted);border:1px solid transparent;border-radius:8px;text-align:left;padding:12px;line-height:1.5}.study-sidebar nav button[aria-current=step]{background:var(--surface);border-color:var(--accent);color:var(--text)}.study-sidebar progress{width:100%;accent-color:var(--accent);height:10px;margin:0 0 20px}.study-sidebar .study-button{width:100%;margin:6px 0}.study-button{background:var(--surface);border:1px solid var(--line);color:var(--text);padding:12px 15px;border-radius:8px;font-size:14px}.study-button:hover{border-color:var(--accent)}button:disabled{opacity:.4;cursor:not-allowed}.study-button.subtle{background:transparent;color:var(--muted)}.study-sidebar #save-status{font-size:13px;line-height:1.6;color:var(--accent)}.study-content h2{font-size:30px;letter-spacing:-1px;line-height:1.2}.study-content p{font-size:16px;line-height:1.85;color:var(--muted)}.study-content .site-notice{font-size:13px;line-height:1.7}.study-video video{width:100%;background:var(--surface);border:1px solid var(--line);border-radius:16px;margin-top:22px;aspect-ratio:16/9}.case-study,.active-lesson,.project-review,.knowledge-check,.study-next{padding:32px;margin-top:28px;border:1px solid var(--line);border-radius:18px}.case-study{background:var(--surface)}.case-study dt{font-size:14px;font-weight:bold;margin-top:22px}.case-study dd{font-size:15px;line-height:1.7;color:var(--muted);margin:8px 0 0}.active-lesson label{display:block;line-height:1.7;font-weight:bold;margin:24px 0 12px}.active-lesson textarea{width:100%;resize:vertical;background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:18px;color:var(--text);font:16px/1.8 Arial,sans-serif}.active-lesson textarea:focus-visible{outline:2px solid var(--accent)}.lesson-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px}.lesson-actions .primary{border:0}.step-visual{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:24px 0}.visual-step{padding:15px;border:1px solid var(--line);border-radius:10px;background:var(--surface);font-size:14px;line-height:1.5;color:var(--muted)}.visual-step.current{border-color:var(--accent);color:var(--text);background:#18281b}.visual-step span{display:block;color:var(--accent);font:12px monospace;margin-bottom:8px}.project-review label{display:flex;gap:12px;align-items:start;font-size:15px;line-height:1.7;margin:15px 0}.project-review input{accent-color:var(--accent);margin-top:7px}.knowledge-check .quiz{margin-top:25px}.knowledge-check .quiz button[aria-pressed=true]{border-color:var(--accent)}#study-answer,#study-completion{color:var(--accent)}#study-completion{border-top:1px solid var(--line);padding-top:20px}.study-next .primary{margin-top:10px}@media(max-width:800px){.study-layout{grid-template-columns:1fr;gap:20px;padding-top:0}.study-sidebar{position:static}.study-sidebar nav{display:grid!important;grid-template-columns:1fr 1fr}.study-header{padding-top:35px}.case-study,.active-lesson,.project-review,.knowledge-check,.study-next{padding:23px}.study-content h2{font-size:27px}.lesson-actions{flex-direction:column}.study-header .page-title{font-size:40px}}