@import url('https://fonts.googleapis.com/css2?family=Merriweather:wght@400;700&family=Source+Sans+3:wght@400;600;700&display=swap');
/* @license GPL-2.0-or-later https://www.drupal.org/licensing/faq */
.brass-tutorial{font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif;line-height:1.6;color:#333;max-width:1000px;margin:0 auto;}.brass-tutorial h2{color:#667eea;margin-top:40px;margin-bottom:20px;border-bottom:3px solid #667eea;padding-bottom:10px;}.brass-tutorial h3{color:#764ba2;margin-top:25px;margin-bottom:15px;}.brass-tutorial p{margin-bottom:15px;}.brass-tutorial ul{margin-left:30px;margin-bottom:15px;}.brass-tutorial li{margin-bottom:8px;}.interactive-demo{background:linear-gradient(135deg,#f5f7fa 0%,#c3cfe2 100%);padding:30px;margin:30px 0;border-radius:10px;box-shadow:0 5px 15px rgba(0,0,0,0.1);}.demo-title{font-size:1.3em;color:#764ba2;margin-bottom:20px;text-align:center;font-weight:bold;}.harmonic-visualizer{display:flex;align-items:flex-end;justify-content:space-around;height:250px;margin:20px 0;padding:20px;background:white;border-radius:8px;}.harmonic-bar{width:40px;background:linear-gradient(to top,#667eea,#764ba2);border-radius:5px 5px 0 0;transition:all 0.3s ease;cursor:pointer;position:relative;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;}.harmonic-bar:hover{background:linear-gradient(to top,#764ba2,#667eea);transform:scale(1.05);}.harmonic-bar.active{background:linear-gradient(to top,#ff6b6b,#ee5a24);animation:pulse 0.5s ease;}@keyframes pulse{0%,100%{transform:scale(1);}50%{transform:scale(1.1);}}.harmonic-label{position:absolute;bottom:-25px;font-size:0.8em;font-weight:bold;color:#333;}.harmonic-note{position:absolute;top:-25px;font-size:0.9em;font-weight:bold;color:#764ba2;}.trombone-simulator{background:white;padding:30px;border-radius:8px;margin:20px 0;}.trombone-visual{position:relative;height:150px;margin:30px 0;}.trombone-outer{position:absolute;top:50px;left:50px;width:400px;height:40px;background:linear-gradient(to right,#c9a227,#f4d03f);border-radius:5px;box-shadow:0 4px 8px rgba(0,0,0,0.2);}.trombone-inner{position:absolute;top:55px;left:150px;width:300px;height:30px;background:linear-gradient(to right,#d4af37,#ffd700);border-radius:5px;transition:left 0.3s ease;box-shadow:inset 0 2px 4px rgba(0,0,0,0.2);}.slide-control{margin-top:20px;text-align:center;}.slide-control input[type="range"]{width:80%;height:8px;background:#ddd;border-radius:5px;outline:none;}.slide-control input[type="range"]::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:20px;height:20px;background:#764ba2;border-radius:50%;cursor:pointer;}.slide-control input[type="range"]::-moz-range-thumb{width:20px;height:20px;background:#764ba2;border-radius:50%;cursor:pointer;border:none;}.position-display{margin-top:15px;font-size:1.2em;font-weight:bold;color:#764ba2;}.valve-simulator{background:white;padding:30px;border-radius:8px;margin:20px 0;}.valves-container{display:flex;justify-content:center;gap:40px;margin:30px 0;flex-wrap:wrap;}.valve{display:flex;flex-direction:column;align-items:center;cursor:pointer;}.valve-button{width:80px;height:120px;background:linear-gradient(to bottom,#c9a227,#f4d03f);border-radius:10px;box-shadow:0 5px 15px rgba(0,0,0,0.3);transition:all 0.2s ease;position:relative;overflow:hidden;}.valve-button::before{content:'';position:absolute;top:0;left:0;right:0;height:50%;background:rgba(255,255,255,0.2);border-radius:10px 10px 0 0;}.valve.pressed .valve-button{transform:translateY(10px);box-shadow:0 2px 5px rgba(0,0,0,0.3);background:linear-gradient(to bottom,#d4af37,#ffd700);}.valve-label{margin-top:15px;font-weight:bold;color:#333;}.valve-info{font-size:0.9em;color:#666;text-align:center;}.semitone-display{margin-top:20px;padding:15px;background:#f0f0f0;border-radius:8px;text-align:center;font-size:1.1em;font-weight:bold;color:#764ba2;}.wave-container{height:150px;background:white;border-radius:8px;margin:20px 0;position:relative;overflow:hidden;}.wave{position:absolute;width:100%;height:100%;}.wave-path{stroke:#667eea;stroke-width:3;fill:none;}.control-buttons{display:flex;justify-content:center;gap:15px;margin:20px 0;flex-wrap:wrap;}.btn{padding:12px 25px;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:white;border:none;border-radius:25px;cursor:pointer;font-size:1em;font-weight:bold;transition:all 0.3s ease;box-shadow:0 4px 10px rgba(0,0,0,0.2);}.btn:hover{transform:translateY(-2px);box-shadow:0 6px 15px rgba(0,0,0,0.3);}.btn:active{transform:translateY(0);}.info-box{background:#e3f2fd;border-left:4px solid #667eea;padding:15px;margin:20px 0;border-radius:5px;}.info-box strong{color:#764ba2;}@media (max-width:768px){.trombone-outer{width:300px;left:20px;}.trombone-inner{width:200px;left:120px;}.harmonic-visualizer{height:200px;padding:10px;}.harmonic-bar{width:30px;}.valves-container{gap:20px;}}
:root{--brass-gold:#B8860B;--brass-dark:#8B6914;--deep-blue:#1a2332;--slate:#475569;--cream:#faf8f3;--accent-red:#dc2626;--border-soft:#e2d5c3;}.trombone-lesson{font-family:'Source Sans 3',sans-serif;background:linear-gradient(135deg,var(--cream) 0%,#f0e9dc 100%);color:var(--deep-blue);padding:3rem 2rem;min-height:100vh;}.trombone-lesson *{box-sizing:border-box;}.lesson-container{max-width:1200px;margin:0 auto;background:white;border-radius:16px;box-shadow:0 20px 60px rgba(0,0,0,0.12);overflow:hidden;}.lesson-header{background:linear-gradient(135deg,var(--brass-dark) 0%,var(--brass-gold) 100%);color:white;padding:3rem 2.5rem;position:relative;overflow:hidden;}.lesson-header::before{content:'';position:absolute;top:-50%;right:-10%;width:300px;height:300px;background:radial-gradient(circle,rgba(255,255,255,0.1) 0%,transparent 70%);border-radius:50%;}.lesson-header h1{font-family:'Merriweather',serif;font-size:2.5rem;font-weight:700;margin-bottom:0.5rem;position:relative;z-index:1;}.lesson-header p{font-size:1.125rem;opacity:0.95;position:relative;z-index:1;}.lesson-content{padding:2.5rem;}.intro-section{background:linear-gradient(to right,#f8f9fa,white);border-left:4px solid var(--brass-gold);padding:1.5rem;margin-bottom:2.5rem;border-radius:8px;}.intro-section p{line-height:1.7;color:var(--slate);}.controls-section{display:flex;gap:1rem;margin-bottom:2.5rem;flex-wrap:wrap;align-items:center;}.control-label{font-weight:600;color:var(--deep-blue);font-size:1rem;}.position-buttons{display:flex;gap:0.5rem;flex-wrap:wrap;}.position-btn{background:white;border:2px solid var(--border-soft);color:var(--deep-blue);padding:0.75rem 1.5rem;font-size:1rem;font-weight:600;border-radius:8px;cursor:pointer;transition:all 0.3s ease;font-family:'Source Sans 3',sans-serif;}.position-btn:hover{background:var(--cream);border-color:var(--brass-gold);transform:translateY(-2px);box-shadow:0 4px 12px rgba(184,134,11,0.2);}.position-btn.active{background:var(--brass-gold);border-color:var(--brass-dark);color:white;transform:translateY(-2px);box-shadow:0 6px 16px rgba(184,134,11,0.3);}.visualization-container{background:white;border:2px solid var(--border-soft);border-radius:12px;padding:2rem;margin-bottom:2.5rem;}.slide-visual{display:flex;align-items:center;justify-content:center;margin-bottom:2rem;position:relative;height:120px;}.trombone-bell{width:80px;height:80px;background:linear-gradient(135deg,var(--brass-gold) 0%,var(--brass-dark) 100%);border-radius:50% 50% 50% 0;transform:rotate(-45deg);position:relative;box-shadow:0 4px 12px rgba(0,0,0,0.15);}.trombone-slide{width:300px;height:20px;background:linear-gradient(to right,var(--brass-dark),var(--brass-gold));position:relative;border-radius:10px;margin-left:-20px;box-shadow:inset 0 2px 4px rgba(0,0,0,0.2);}.slide-marker{position:absolute;width:30px;height:30px;background:var(--accent-red);border:3px solid white;border-radius:50%;top:-5px;transition:left 0.5s cubic-bezier(0.4,0,0.2,1);box-shadow:0 4px 8px rgba(220,38,38,0.4);z-index:2;}.position-label{text-align:center;font-size:1.25rem;font-weight:700;color:var(--brass-dark);margin-bottom:1.5rem;}.notes-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.5rem;margin-bottom:2rem;}.note-card{background:linear-gradient(135deg,#f8fafc 0%,white 100%);border:2px solid var(--border-soft);border-radius:10px;padding:1.5rem;transition:all 0.3s ease;opacity:0;animation:fadeInUp 0.5s ease forwards;}@keyframes fadeInUp{from{opacity:0;transform:translateY(20px);}to{opacity:1;transform:translateY(0);}}.note-card:nth-child(1){animation-delay:0.1s;}.note-card:nth-child(2){animation-delay:0.2s;}.note-card:nth-child(3){animation-delay:0.3s;}.note-card:nth-child(4){animation-delay:0.4s;}.note-card:nth-child(5){animation-delay:0.5s;}.note-card:nth-child(6){animation-delay:0.6s;}.note-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(0,0,0,0.1);border-color:var(--brass-gold);}.note-name{font-size:2rem;font-weight:700;color:var(--brass-dark);margin-bottom:0.5rem;font-family:'Merriweather',serif;}.note-freq{font-size:0.875rem;color:var(--slate);margin-bottom:0.25rem;}.note-octave{font-size:0.875rem;color:var(--brass-gold);font-weight:600;}.all-positions-section{background:linear-gradient(to bottom,#f8f9fa,white);border-radius:12px;padding:2rem;margin-top:2.5rem;}.all-positions-section h2{font-family:'Merriweather',serif;color:var(--deep-blue);margin-bottom:1.5rem;font-size:1.75rem;}.position-reference{display:grid;gap:1rem;}.position-item{background:white;border:1px solid var(--border-soft);border-radius:8px;padding:1.25rem;transition:all 0.3s ease;}.position-item:hover{border-color:var(--brass-gold);box-shadow:0 4px 12px rgba(0,0,0,0.08);}.position-item h3{color:var(--brass-dark);margin-bottom:0.75rem;font-size:1.125rem;font-weight:700;}.position-notes{display:flex;flex-wrap:wrap;gap:0.5rem;}.note-tag{background:var(--cream);color:var(--deep-blue);padding:0.5rem 1rem;border-radius:6px;font-size:0.875rem;font-weight:600;border:1px solid var(--border-soft);}@media (max-width:768px){.lesson-header h1{font-size:2rem;}.slide-visual{flex-direction:column;height:auto;gap:1rem;}.trombone-slide{width:200px;margin-left:0;}.notes-grid{grid-template-columns:1fr;}}