:root{--bg: #0f1419;--bg-card: #1a2332;--bg-hover: #1f2b3d;--text: #e7f2f7;--text-muted: #8899a6;--accent: #7CFF00;--accent-hover: #6be600;--accent-dim: rgba(124, 255, 0, .1);--danger: #ff4757;--danger-dim: rgba(255, 71, 87, .1);--success: #7CFF00;--success-dim: rgba(124, 255, 0, .15);--warning: #ffb800;--border: #2d3e50;--border-light: #253545;--radius: 12px;--radius-sm: 8px;--gap: 16px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scrollbar-gutter:stable;-webkit-text-size-adjust:100%}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.5;min-height:100vh;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.app-layout{display:flex;min-height:100vh}.app-sidebar{width:272px;background:var(--bg-card);border-right:1px solid var(--border);display:flex;flex-direction:column;position:fixed;top:0;left:0;bottom:0;z-index:100;overflow-y:auto;transition:transform .3s ease;-webkit-overflow-scrolling:touch}.app-sidebar-header{padding:20px 16px 14px;border-bottom:1px solid var(--border)}.app-sidebar-header h1{font-size:1.2rem;font-weight:700;display:flex;align-items:center;gap:8px;color:var(--text)}.app-main{flex:1;margin-left:272px;padding:24px 28px;max-width:1100px;width:calc(100% - 272px);min-height:100vh}.sidebar-gruppe-header{display:flex;align-items:center;gap:8px;padding:12px 16px 6px;font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:var(--text-muted);cursor:pointer;-webkit-user-select:none;user-select:none;transition:color .15s}.sidebar-gruppe-header:hover{color:var(--accent)}.sidebar-gruppe-count{font-size:.65rem;font-weight:600;background:#ffffff0f;color:var(--text-muted);padding:1px 7px;border-radius:10px;margin-left:auto;margin-right:4px;letter-spacing:0;text-transform:none}.sidebar-gruppe-children{overflow:hidden;max-height:0;transition:max-height .35s ease}.sidebar-gruppe-children.open{max-height:2000px}.sidebar-section{padding:6px 10px}.sidebar-section-title{font-size:.65rem;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:var(--text-muted);padding:14px 6px 6px}.sidebar-link{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:var(--radius-sm);color:var(--text-muted);text-decoration:none;font-size:.88rem;font-weight:450;transition:all .15s ease;cursor:pointer;border:none;background:none;width:100%;text-align:left;min-height:40px}.sidebar-link:hover{background:#ffffff0a;color:var(--text)}.sidebar-link.active{background:var(--accent-dim);color:var(--accent);font-weight:600}.sidebar-link svg{width:18px;height:18px;flex-shrink:0}.sidebar-bereich-header{display:flex;align-items:center;justify-content:space-between;padding:7px 12px;border-radius:var(--radius-sm);cursor:pointer;font-size:.88rem;font-weight:450;color:var(--text-muted);transition:all .15s;-webkit-user-select:none;user-select:none;min-height:38px}.sidebar-bereich-header:hover{background:#ffffff0a}.sidebar-bereich-header.open{color:var(--text);font-weight:600}.sidebar-bereich-children{overflow:hidden;max-height:0;transition:max-height .3s ease;padding-left:14px}.sidebar-bereich-children.open{max-height:300px}.page-header{margin-bottom:24px}.page-header h2{font-size:1.4rem;font-weight:700;letter-spacing:-.02em;color:var(--text)}.page-header p{margin-top:4px;color:var(--text-muted);font-size:.9rem}.card{background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);padding:20px}.card-elevated{border-color:var(--border);transition:border-color .15s,transform .15s}.card-elevated:hover{border-color:#7cff0040;transform:translateY(-1px)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 20px;border-radius:var(--radius);font-family:inherit;font-size:.88rem;font-weight:500;border:none;cursor:pointer;transition:all .2s;text-decoration:none;white-space:nowrap;min-height:44px}.btn:disabled{opacity:.5;cursor:not-allowed}.btn svg{width:16px;height:16px}.btn-primary{background:var(--accent);color:#000}.btn-primary:hover:not(:disabled){background:var(--accent-hover);transform:translateY(-1px)}.btn-secondary{background:var(--bg-card);color:var(--text);border:1px solid var(--border)}.btn-secondary:hover:not(:disabled){border-color:var(--text-muted)}.btn-danger{background:transparent;color:var(--danger);border:1px solid var(--danger)}.btn-danger:hover:not(:disabled){background:var(--danger-dim)}.btn-success{background:var(--accent);color:#000}.btn-success:hover:not(:disabled){background:var(--accent-hover)}.btn-ghost{background:transparent;color:var(--text-muted);padding:8px 12px}.btn-ghost:hover{background:#ffffff0a;color:var(--text)}.btn-sm{padding:6px 14px;font-size:.82rem;min-height:36px}.btn-icon{padding:8px;min-height:36px;min-width:36px;border-radius:var(--radius-sm)}.form-group{margin-bottom:var(--gap)}.form-label{display:block;font-size:.82rem;font-weight:500;color:var(--text-muted);margin-bottom:6px}.form-input,.form-select,.form-textarea{width:100%;padding:12px 14px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);font-family:inherit;font-size:.9rem;transition:border-color .2s;min-height:44px}.form-input:focus,.form-select:focus,.form-textarea:focus{outline:none;border-color:var(--accent)}.form-input::placeholder,.form-textarea::placeholder{color:var(--text-muted);opacity:.5}.form-textarea{min-height:100px;resize:vertical;line-height:1.5}.form-select{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238899a6' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:36px}.form-checkbox-row{display:flex;align-items:center;gap:8px;margin:12px 0;min-height:44px}.form-checkbox-row input[type=checkbox]{width:20px;height:20px;accent-color:var(--accent)}.form-checkbox-row label{font-size:.88rem;font-weight:450;color:var(--text);cursor:pointer}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:var(--gap)}.table-wrapper{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--border);-webkit-overflow-scrolling:touch}table{width:100%;border-collapse:collapse;font-size:.88rem}thead th{background:#ffffff08;padding:12px 16px;text-align:left;font-weight:600;font-size:.75rem;text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);border-bottom:1px solid var(--border)}tbody td{padding:12px 16px;border-bottom:1px solid var(--border-light);vertical-align:top}tbody tr:hover{background:#ffffff05}tbody tr:last-child td{border-bottom:none}.flashcard{background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);padding:32px 24px;max-width:800px;margin:0 auto;text-align:center;cursor:pointer;transition:border-color .2s,transform .15s;-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent}.flashcard:hover{border-color:#7cff0033}.flashcard:active{transform:scale(.99)}.flashcard-frage{font-size:1.25rem;font-weight:600;color:var(--text);line-height:1.5;white-space:pre-line;text-align:center}.flashcard-antwort{margin-top:24px;padding-top:24px;border-top:1px solid var(--border);font-size:1.15rem;color:var(--accent);font-weight:600;animation:fadeIn .3s ease;white-space:pre-line}.flashcard-erklaerung{margin-top:20px;background:#7cff000f;border-left:3px solid var(--accent);border-radius:var(--radius-sm);padding:16px 18px;text-align:left;font-size:.9rem;color:var(--text);line-height:1.6;white-space:pre-line;animation:fadeIn .3s ease}.flashcard-erklaerung strong{color:var(--accent);display:block;margin-bottom:6px;font-size:.82rem;text-transform:uppercase;letter-spacing:.04em}.flashcard-options{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:20px}.flashcard-option{padding:14px 16px;border:1px solid var(--border);border-radius:var(--radius);font-size:.95rem;cursor:pointer;transition:all .15s;background:var(--bg);text-align:center;color:var(--text);min-height:48px;display:flex;align-items:center;justify-content:center;-webkit-tap-highlight-color:transparent}.flashcard-option:hover{border-color:var(--accent);background:var(--accent-dim)}.flashcard-option.selected{border-color:var(--accent);background:var(--accent-dim);font-weight:600;color:var(--accent)}.flashcard-option.richtig{border-color:var(--accent);background:var(--success-dim);color:var(--accent);font-weight:600}.flashcard-option.falsch{border-color:var(--danger);background:var(--danger-dim);color:var(--danger);font-weight:600}.flashcard-img{max-width:100%;height:auto;border-radius:var(--radius-sm);margin:10px 0}.flashcard-controls{display:flex;justify-content:center;gap:12px;margin-top:24px}.badge{display:inline-flex;align-items:center;padding:3px 10px;border-radius:20px;font-size:.75rem;font-weight:600}.badge-blue{background:var(--accent-dim);color:var(--accent);border:1px solid rgba(124,255,0,.2)}.badge-green{background:var(--success-dim);color:var(--success)}.toast{padding:12px 16px;border-radius:var(--radius);font-size:.88rem;font-weight:500;margin-bottom:var(--gap);animation:slideIn .3s ease;cursor:pointer}.toast-success{background:var(--success-dim);border:1px solid var(--accent);color:var(--accent)}.toast-error{background:var(--danger-dim);border:1px solid var(--danger);color:var(--danger)}.search-bar{display:flex;align-items:center;gap:8px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:2px 4px 2px 14px;transition:border-color .2s}.search-bar:focus-within{border-color:var(--accent)}.search-bar input{flex:1;border:none;outline:none;font-family:inherit;font-size:.9rem;padding:10px 0;background:transparent;color:var(--text);min-height:44px}.search-bar input::placeholder{color:var(--text-muted);opacity:.5}.search-bar svg{color:var(--text-muted);width:18px;height:18px;flex-shrink:0}.empty-state{text-align:center;padding:48px 20px;color:var(--text-muted)}.empty-state svg{width:48px;height:48px;margin-bottom:16px;opacity:.3}.empty-state h3{font-size:1.05rem;color:var(--text);margin-bottom:6px}.empty-state a{color:var(--accent);text-decoration:none}.empty-state a:hover{text-decoration:underline}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes slideIn{0%{opacity:0;transform:translate(-12px)}to{opacity:1;transform:translate(0)}}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.mobile-menu-btn{display:none;position:fixed;top:12px;left:12px;z-index:200;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:10px;cursor:pointer;color:var(--text);min-height:44px;min-width:44px;align-items:center;justify-content:center}@media(max-width:1024px){.app-sidebar{width:240px}.app-main{margin-left:240px;width:calc(100% - 240px);padding:20px}}@media(max-width:768px){.app-sidebar{transform:translate(-100%);width:280px;box-shadow:none}.app-sidebar.open{transform:translate(0);box-shadow:8px 0 30px #00000080}.app-main{margin-left:0;width:100%;padding:60px 16px 16px}.mobile-menu-btn{display:flex!important}.page-header h2{font-size:1.2rem}.flashcard{padding:24px 16px}.flashcard-frage{font-size:1.1rem}.flashcard-options{grid-template-columns:1fr}.flashcard-controls{flex-direction:column}.flashcard-controls .btn{width:100%}.form-row{grid-template-columns:1fr}.form-input,.form-select,.form-textarea{font-size:16px;padding:12px}.card{padding:16px}.table-wrapper{margin:0 -16px;border-radius:0;border-left:none;border-right:none}thead th,tbody td{padding:10px 12px;font-size:.82rem}.btn{min-height:48px}.btn-sm{min-height:40px}}@media(max-width:400px){.app-main{padding:56px 12px 12px}.flashcard-frage{font-size:1rem}.page-header h2{font-size:1.1rem}}@supports (padding: env(safe-area-inset-bottom)){.app-sidebar{padding-bottom:env(safe-area-inset-bottom)}.app-main{padding-bottom:calc(16px + env(safe-area-inset-bottom))}}input[type=date]{-webkit-appearance:none;-moz-appearance:none;appearance:none;min-height:44px}@supports (-webkit-touch-callout: none){input[type=date],input[type=file]{font-size:16px}}@media(hover:none)and (pointer:coarse){.sidebar-link,.sidebar-bereich-header,.sidebar-gruppe-header{min-height:44px}.flashcard-option{min-height:52px}}