/* Schriften lokal statt von Google Fonts (Datenschutz: keine IP-Übertragung an Google) */
@font-face{font-family:'DM Sans';font-style:normal;font-weight:400;font-display:swap;src:url('../fonts/dm-sans-400.woff') format('woff')}
@font-face{font-family:'DM Sans';font-style:normal;font-weight:500;font-display:swap;src:url('../fonts/dm-sans-500.woff') format('woff')}
@font-face{font-family:'DM Sans';font-style:normal;font-weight:600;font-display:swap;src:url('../fonts/dm-sans-600.woff') format('woff')}
@font-face{font-family:'DM Sans';font-style:normal;font-weight:700;font-display:swap;src:url('../fonts/dm-sans-700.woff') format('woff')}
@font-face{font-family:'DM Sans';font-style:normal;font-weight:800;font-display:swap;src:url('../fonts/dm-sans-800.woff') format('woff')}
@font-face{font-family:'DM Mono';font-style:normal;font-weight:400;font-display:swap;src:url('../fonts/dm-mono-400.woff') format('woff')}
@font-face{font-family:'DM Mono';font-style:normal;font-weight:500;font-display:swap;src:url('../fonts/dm-mono-500.woff') format('woff')}
:root{color-scheme:dark;--bg:#10131b;--panel:#181c27;--panel2:#1e2330;--line:#2a3040;--text:#f3f4f7;--muted:#9299aa;--green:#91e5b0;--green2:#57c987;--purple:#b6a1ff;--red:#ff8b8b;--yellow:#f5cb75;--mono:'DM Mono',monospace;--sans:'DM Sans',system-ui,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--sans);font-size:14px}.app-shell{min-height:100vh;display:grid;grid-template-columns:260px minmax(0,1fr)}.sidebar{background:#141720;border-right:1px solid var(--line);padding:26px 17px 20px;display:flex;flex-direction:column;min-height:100vh;position:sticky;top:0;height:100vh}.brand{display:flex;gap:12px;align-items:center;color:var(--text);font-weight:800;font-size:18px;text-decoration:none;letter-spacing:-.5px}.brand-mark{background:var(--green);color:#102218;border-radius:10px;padding:10px;font:600 14px var(--mono)}.brand small{display:block;color:var(--muted);font-size:9px;letter-spacing:1.4px;margin-top:3px}.profile-card{display:flex;align-items:center;gap:11px;margin:33px 0 20px}.avatar{background:#252a39;width:40px;height:40px;border-radius:12px;display:grid;place-items:center;font-size:19px}.profile-card small,.xp-box small{display:block;color:var(--muted);font-size:11px;margin-top:4px}.xp-box{padding:13px;background:var(--panel);border:1px solid var(--line);border-radius:12px;margin-bottom:27px}.xp-heading{display:flex;justify-content:space-between;font-size:11px}.xp-heading b{color:var(--yellow)}.xp-track,.chapter-track{height:5px;background:#303645;border-radius:9px;margin:11px 0 7px;overflow:hidden}.xp-track i,.chapter-track i{display:block;height:100%;background:var(--green2);border-radius:9px;transition:width .3s}.nav-title{font-size:10px;color:#70788a;font-weight:700;letter-spacing:1.3px;padding-left:10px;margin-bottom:10px}#lesson-nav{display:grid;gap:5px}.nav-item{background:transparent;border:0;color:#a7adba;border-radius:9px;display:flex;align-items:center;gap:11px;padding:10px;text-align:left;font:500 13px var(--sans);cursor:pointer;width:100%}.nav-item:hover{background:#1d2230;color:var(--text)}.nav-item.active{background:#232a35;color:var(--green)}.nav-icon{width:21px;text-align:center;font-size:15px}.nav-check{margin-left:auto;color:var(--green);font-size:12px}.sidebar-bottom{margin-top:auto;color:#858c9d;font-size:10px;padding:12px 4px}.status-dot{display:inline-block;width:7px;height:7px;border-radius:9px;background:var(--green2);margin-right:7px}.main-content{min-width:0;max-width:1280px;width:100%;margin:auto;min-height:100vh;display:flex;flex-direction:column}.topbar{height:65px;padding:0 42px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;color:var(--muted);font-size:12px}.breadcrumbs span{padding:0 9px;color:#596071}.breadcrumbs b{color:#d7dae2;font-weight:500}.top-stats{display:flex;gap:21px}.top-stats b{color:var(--text)}.content{padding:37px 50px 30px;flex:1;width:100%;max-width:1080px;margin:0 auto}.eyebrow{color:var(--green);font-size:11px;font-weight:700;letter-spacing:1.2px;text-transform:uppercase}.hero{display:grid;grid-template-columns:1.2fr .8fr;gap:28px;align-items:center;background:linear-gradient(120deg,#202a32,#222336);border:1px solid #344045;border-radius:18px;padding:32px 35px;margin-bottom:28px;overflow:hidden}.hero h1{font-size:34px;line-height:1.14;letter-spacing:-1.3px;margin:9px 0 12px;max-width:530px}.hero p,.lead{color:#b9bfcc;line-height:1.7;margin:0}.hero-art{font:500 16px var(--mono);line-height:1.9;color:#a6b5bd;background:#141a21;border:1px solid #33434a;border-radius:13px;padding:20px;transform:rotate(2deg);box-shadow:0 14px 40px #080b1288}.hero-art .kw{color:#d0a7ff}.hero-art .string{color:var(--green)}.hero-art .comment{color:#788b85}.button{border:0;border-radius:9px;padding:11px 16px;font:700 12px var(--sans);cursor:pointer;transition:transform .15s,filter .15s}.button:hover{filter:brightness(1.08);transform:translateY(-1px)}.button.primary{background:var(--green);color:#102218}.button.secondary{background:#2a3040;color:#dce0e9;border:1px solid #3a4151}.button.ghost{background:transparent;color:var(--muted);border:1px solid var(--line)}.hero .button{margin-top:22px}.section-head{display:flex;align-items:end;justify-content:space-between;margin:29px 0 13px}.section-head h2{font-size:17px;margin:0;letter-spacing:-.3px}.section-head span{color:var(--muted);font-size:11px}.chapter-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:11px}.chapter-card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:15px;cursor:pointer;text-align:left;color:inherit}.chapter-card:hover{border-color:#596476;background:#1c212d}.chapter-top{display:flex;justify-content:space-between;align-items:center}.chapter-icon{font-size:20px}.chapter-card b{font-size:13px}.chapter-card small{color:var(--muted);font-size:10px}.chapter-card .chapter-track{margin:11px 0 0}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:20px;align-items:start}.lesson-main h1{font-size:31px;letter-spacing:-1px;margin:8px 0 10px}.lesson-main .lead{margin-bottom:22px}.lesson-main h2{font-size:16px;margin:24px 0 10px}.info-card,.exercise-card,.quiz-card{background:var(--panel);border:1px solid var(--line);border-radius:13px;padding:19px;margin-bottom:14px}.info-card p{color:#c0c5d0;line-height:1.7;margin:0}.code-sample,.editor{font:12px/1.7 var(--mono);white-space:pre-wrap;tab-size:2}.code-sample{background:#10131b;border:1px solid #2b3040;border-radius:9px;padding:14px;color:#d8d9e3;overflow:auto}.editor-wrap{border:1px solid #353b4b;border-radius:12px;overflow:hidden;background:#11141c}.editor-bar{height:38px;background:#1c202b;display:flex;align-items:center;justify-content:space-between;padding:0 13px;color:#9299aa;font-size:10px}.editor-dots{display:flex;gap:5px}.editor-dots i{width:7px;height:7px;border-radius:8px;background:#ff7878}.editor-dots i:nth-child(2){background:#f5cb75}.editor-dots i:nth-child(3){background:#77d99b}.editor{display:block;width:100%;min-height:180px;resize:vertical;background:#11141c;color:#d8d9e3;border:0;padding:15px;outline:none}.editor:focus{box-shadow:inset 0 0 0 1px #547d68}.editor-actions{display:flex;gap:8px;align-items:center;padding:10px;border-top:1px solid #252a36}.editor-actions .spacer{flex:1}.output-box{background:#10131b;border:1px solid #2b3040;border-radius:9px;padding:12px;margin-top:10px;min-height:66px;color:#c8ced9;white-space:pre-wrap;font:12px/1.6 var(--mono)}.output-label{color:var(--muted);font:10px var(--sans);text-transform:uppercase;letter-spacing:1px}.exercise-card{border-color:#3a453f;background:#1a211f}.exercise-card h3{font-size:14px;margin:0 0 7px}.exercise-card p{color:#bac3be;line-height:1.6;margin:0 0 13px}.notice{font-size:11px;margin:9px 0 0;min-height:16px}.notice.good{color:var(--green)}.notice.bad{color:var(--red)}.hint-box{color:#e1c27f;background:#332c1c;border-radius:7px;padding:9px;margin-top:8px;font-size:11px;line-height:1.5}.solution{color:#adb5c2;font:11px var(--mono);margin-top:8px}.lesson-side{position:sticky;top:20px}.side-card{background:var(--panel);border:1px solid var(--line);border-radius:13px;padding:17px;margin-bottom:12px}.side-card h3{font-size:12px;margin:0 0 12px}.side-card p{font-size:11px;line-height:1.6;color:var(--muted);margin:0}.progress-row{display:flex;justify-content:space-between;font-size:10px;color:var(--muted)}.progress-row b{color:var(--text)}.side-card .chapter-track{height:6px}.reward{color:var(--yellow);font-weight:700}.quiz-options{display:grid;gap:8px;margin-top:15px}.quiz-option{padding:11px 12px;background:#131721;border:1px solid #353b4b;color:#d7dbe4;border-radius:8px;text-align:left;cursor:pointer;font:12px var(--sans)}.quiz-option:hover{border-color:#8991a2}.quiz-option.selected{border-color:var(--purple);background:#28243a}.quiz-option.correct{border-color:var(--green2);background:#1e3328}.quiz-option.wrong{border-color:var(--red);background:#382329}.quiz-progress{color:var(--muted);font-size:11px}.quiz-feedback{color:var(--green);margin-top:12px;font-size:12px}.quiz-feedback.bad{color:var(--red)}.quiz-results{text-align:center;padding:24px}.quiz-results .big{font-size:40px}.quiz-results h2{margin:5px}.empty-state{padding:25px;border:1px dashed #3b4252;color:var(--muted);border-radius:12px;text-align:center}.toast{position:fixed;bottom:24px;right:24px;background:#25372c;border:1px solid #44634f;color:#d8ffe3;padding:12px 16px;border-radius:9px;box-shadow:0 12px 35px #0008;z-index:5}.hidden{display:none!important}footer{text-align:center;color:#70788a;font-size:10px;padding:18px;border-top:1px solid var(--line)}footer span{color:var(--green);padding:0 5px}@media(max-width:900px){.app-shell{grid-template-columns:215px 1fr}.sidebar{padding:20px 12px}.content{padding:28px 25px}.topbar{padding:0 25px}.lesson-layout{grid-template-columns:1fr 250px}.hero{grid-template-columns:1fr}.hero-art{display:none}}@media(max-width:680px){.app-shell{display:block}.sidebar{position:relative;height:auto;min-height:0;padding:12px 15px;border-right:0;border-bottom:1px solid var(--line)}.brand{font-size:16px}.profile-card,.xp-box,.nav-title,.sidebar-bottom{display:none}#lesson-nav{display:flex;overflow:auto;margin-top:12px}.nav-item{white-space:nowrap;width:auto;padding:8px}.nav-item span:not(.nav-icon):not(.nav-check){display:none}.nav-check{display:none}.main-content{min-height:calc(100vh - 80px)}.topbar{height:49px;padding:0 15px}.top-stats{gap:10px}.content{padding:23px 15px}.hero{padding:24px 20px}.hero h1{font-size:28px}.chapter-grid{grid-template-columns:1fr}.lesson-layout{grid-template-columns:1fr}.lesson-side{position:static;display:grid;grid-template-columns:1fr 1fr;gap:10px}.side-card{margin:0}.lesson-main h1{font-size:27px}}