*{box-sizing:border-box}
:root{font-family:Inter,Segoe UI,Arial,sans-serif;color:#18212a;background:#f4f6f8}
body{margin:0}
button,select,input,textarea{font:inherit}
button{cursor:pointer;border:1px solid #d4dbe2;background:#fff;border-radius:9px;padding:8px 11px}
button:hover{filter:brightness(.98)}
.primary{background:#2563eb;color:#fff;border-color:#2563eb;font-weight:700}
.ghost{background:transparent}
.topbar{height:72px;background:#111827;color:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 22px;position:sticky;top:0;z-index:20}
.brand{display:flex;align-items:center;gap:12px}.logo{width:42px;height:42px;border-radius:11px;background:#2563eb;display:grid;place-items:center;font-weight:900}.brand h1{margin:0;font-size:19px}.brand h1 span{font-size:9px;background:#16a34a;padding:4px 7px;border-radius:99px;vertical-align:3px}.brand p{margin:3px 0;color:#aab4c0;font-size:11px}.top-actions{display:flex;gap:7px}.top-actions button{background:#202a38;color:white;border-color:#344052}
.app{display:grid;grid-template-columns:235px 1fr;min-height:calc(100vh - 72px)}
.sidebar{background:#fff;border-right:1px solid #dfe4e9;padding:14px;position:sticky;top:72px;height:calc(100vh - 72px);overflow:auto}
.nav{display:block;width:100%;text-align:left;border:0;background:transparent;margin-bottom:5px}.nav.active{background:#eaf1ff;color:#174c9c;font-weight:700}
.side-card{margin-top:14px;padding:11px;border:1px solid #e1e6eb;border-radius:10px;background:#f8fafb;font-size:11px}.side-card p{margin:5px 0;line-height:1.45;color:#65717b}
main{padding:22px 26px}.view{display:none}.view.active{display:block}
.hero{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;margin-bottom:15px}.hero h2{margin:7px 0;font-size:25px}.hero p{margin:0;color:#697580}.pill{display:inline-block;background:#eaf1ff;color:#245bb3;border-radius:99px;padding:5px 8px;font-size:10px;font-weight:700}.hero-actions{display:flex;gap:7px}.hero select,.hero input{padding:9px;border:1px solid #cdd5dd;border-radius:9px;background:#fff}
.editor-card{background:#fff;border:1px solid #dfe4e9;border-radius:14px;overflow:hidden}.editor-head,.editor-footer{display:flex;justify-content:space-between;align-items:center;padding:10px 12px}.editor-head{border-bottom:1px solid #edf0f2;font-size:10px;color:#6f7b85}.editor-footer{border-top:1px solid #edf0f2;font-size:11px;color:#6e7983}.editor-card textarea{width:100%;min-height:330px;resize:vertical;border:0;outline:0;background:#111820;color:#eef3f7;padding:18px;font-family:Consolas,monospace;font-size:13px;line-height:1.55}
.results{margin-top:16px}.hidden{display:none!important}.result-tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:10px}.tab{font-size:11px}.tab.active{background:#202a38;color:#fff;border-color:#202a38}.tab-panel{display:none;background:#fff;border:1px solid #dfe4e9;border-radius:13px;padding:17px}.tab-panel.active{display:block}
.summary-box{background:#f6f8fa;border-radius:10px;padding:13px;line-height:1.55}.summary-box h3{margin-top:0}.line-row{display:grid;grid-template-columns:44px 1fr 1.2fr;gap:10px;align-items:start;padding:10px 0;border-bottom:1px solid #edf0f2}.line-row:last-child{border-bottom:0}.line-no{font-size:10px;color:#77838d;padding-top:5px}.line-code{background:#111820;color:#edf2f6;border-radius:7px;padding:8px;font-family:Consolas,monospace;font-size:11px;white-space:pre-wrap}.line-explain{font-size:12px;line-height:1.5}.term-card{border:1px solid #e0e5ea;border-radius:10px;padding:11px;margin:7px 0}.term-card code{background:#eef3f7;padding:3px 5px;border-radius:5px}.pseudo{background:#111820;color:#edf2f6;border-radius:10px;padding:14px;white-space:pre-wrap;font-family:Consolas,monospace;font-size:12px;line-height:1.55}
.card-suggestion{border:1px solid #dfe4e9;border-radius:10px;padding:11px;margin:8px 0;display:flex;justify-content:space-between;gap:10px}.card-suggestion p{margin:4px 0;font-size:12px;line-height:1.4}
.result-bottom{display:flex;justify-content:space-between;gap:12px;margin-top:10px;flex-wrap:wrap}.audio-box,.export-box{display:flex;align-items:center;gap:6px;flex-wrap:wrap;background:#fff;border:1px solid #dfe4e9;border-radius:11px;padding:9px}.audio-box{font-size:10px}.audio-box select{max-width:200px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:11px}.saved-card,.glossary-card{background:#fff;border:1px solid #dfe4e9;border-radius:12px;padding:12px}.saved-card h3,.glossary-card h3{margin:0 0 7px}.saved-card p,.glossary-card p{font-size:12px;line-height:1.45;color:#5f6b75}.saved-card code,.glossary-card code{font-family:Consolas,monospace;background:#eef3f7;padding:3px 5px;border-radius:4px}.quiz-area{max-width:720px}.quiz-box{background:#fff;border:1px solid #dfe4e9;border-radius:13px;padding:17px}.quiz-choices{display:grid;gap:7px;margin-top:12px}.correct{background:#e8f7ed!important;border-color:#9fd3ae!important}.wrong{background:#feecec!important;border-color:#df9a9a!important}
.modal{position:fixed;inset:0;background:#0008;display:grid;place-items:center;padding:20px;z-index:50}.modal-card{background:#fff;border-radius:15px;width:min(720px,95vw);max-height:88vh;overflow:auto;padding:20px;position:relative}.close{position:absolute;right:10px;top:8px;border:0;font-size:23px}
@media(max-width:850px){.app{grid-template-columns:1fr}.sidebar{position:static;height:auto;border-right:0;border-bottom:1px solid #ddd}.hero{align-items:stretch;flex-direction:column}.hero-actions{flex-direction:column}main{padding:15px}.top-actions{display:none}.line-row{grid-template-columns:1fr}.line-no{display:none}.result-bottom{flex-direction:column}.audio-box,.export-box{width:100%}}