:root{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;--primary-color: #4b6cb7;--primary-hover: #3b5998;--secondary-color: #182848;--accent-color: #ff4d4d;--bg-color: #f4f7f6;--card-bg: #ffffff;--text-main: #333333;--text-secondary: #666666;--border-color: #e0e0e0;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .1);--shadow-md: 0 4px 6px rgba(0, 0, 0, .05);--shadow-lg: 0 10px 15px rgba(0, 0, 0, .05);color-scheme:light;color:var(--text-main);background-color:var(--bg-color);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;display:flex;flex-direction:column;min-height:100vh;background-color:var(--bg-color);color:var(--text-main)}a{font-weight:500;color:var(--primary-color);text-decoration:inherit;transition:color .2s}a:hover{color:var(--primary-hover)}h1,h2,h3{color:var(--secondary-color);margin-top:0}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:600;font-family:inherit;background-color:var(--primary-color);color:#fff;cursor:pointer;transition:all .25s;box-shadow:var(--shadow-sm)}button:hover{background-color:var(--primary-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}button:active{transform:translateY(1px)}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:#f1f1f1}::-webkit-scrollbar-thumb{background:#ccc;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#bbb}.navbar{background-color:#fff;box-shadow:0 1px 2px #0000000d;padding:1rem 2rem;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:1000}.navbar-brand{display:flex;align-items:center;gap:.5rem;text-decoration:none;color:var(--secondary-color)}.brand-icon{display:flex;align-items:center;justify-content:center}.brand-text{font-size:1.25rem;font-weight:700}.navbar-links{display:flex;align-items:center;gap:2rem;position:absolute;left:50%;transform:translate(-50%)}.nav-item{color:var(--text-main);font-weight:500;font-size:1rem;text-decoration:none;transition:color .2s;background:transparent;border:none;padding:0;cursor:pointer;font-family:inherit;display:flex;align-items:center;box-shadow:none}.nav-item:hover{color:var(--primary-color);background:transparent;box-shadow:none;transform:none}.dropdown-container{position:relative;display:flex;align-items:center;height:100%}.dropdown-toggle{display:flex;align-items:center;gap:.25rem}.chevron-icon{transition:transform .2s ease}.dropdown-menu{position:absolute;top:150%;left:0;background-color:#fff;min-width:260px;border-radius:8px;box-shadow:0 10px 25px #0000001a;opacity:0;visibility:hidden;transform:translateY(10px);transition:all .2s cubic-bezier(.25,.8,.25,1);display:flex;flex-direction:column;padding:.5rem 0;border:1px solid var(--border-color);z-index:1001}.dropdown-container:hover .dropdown-menu,.dropdown-container.active .dropdown-menu{opacity:1;visibility:visible;transform:translateY(0)}.dropdown-container:hover .chevron-icon,.dropdown-container.active .chevron-icon{transform:rotate(180deg)}.dropdown-item{display:flex;align-items:center;gap:1rem;padding:.75rem 1.25rem;text-decoration:none;color:var(--text-main);font-weight:400;transition:background-color .2s ease,color .2s ease}.dropdown-icon{color:var(--text-secondary);display:flex;transition:color .2s ease}.dropdown-item:hover{background-color:#f0f4ff;color:var(--primary-color)}.dropdown-item:hover .dropdown-icon{color:var(--primary-color)}.hamburger{display:none;flex-direction:column;cursor:pointer;gap:5px;z-index:1002}.hamburger div{width:25px;height:3px;background-color:#333;transition:all .3s ease}@media(max-width:768px){.navbar{padding:1rem}.hamburger{display:flex}.hamburger.active div:nth-child(1){transform:rotate(-45deg) translate(-5px,6px)}.hamburger.active div:nth-child(2){opacity:0}.hamburger.active div:nth-child(3){transform:rotate(45deg) translate(-5px,-6px)}.navbar-links{display:none;flex-direction:column;align-items:flex-start;position:absolute;top:100%;left:0;right:0;transform:none;background-color:#fff;padding:1.5rem;box-shadow:0 4px 6px #0000001a;gap:1.5rem;max-height:calc(100vh - 70px);overflow-y:auto}.navbar-links.open{display:flex}.nav-item{font-size:1.1rem;width:100%;justify-content:flex-start}.dropdown-container{flex-direction:column;align-items:flex-start;width:100%}.dropdown-toggle{justify-content:space-between}.dropdown-menu{position:static;box-shadow:none;border:none;background-color:transparent;width:100%;padding:0;max-height:0;opacity:0;visibility:hidden;overflow:hidden;margin-top:0;transition:max-height .3s ease,opacity .3s ease;border-radius:4px;transform:none}.dropdown-container.active .dropdown-menu{max-height:500px;opacity:1;visibility:visible;margin-top:.5rem;padding:0}.dropdown-item{padding:.75rem 1rem;border-left:2px solid transparent;background-color:transparent}.dropdown-item:hover{border-left-color:var(--primary-color);background-color:transparent}}.home-container{padding:4rem 2rem;max-width:1000px;margin:0 auto}.home-header{text-align:center;margin-bottom:4rem}.home-title{font-size:3.5rem;font-weight:800;margin-bottom:1rem;color:var(--secondary-color);letter-spacing:-.05em;display:flex;align-items:center;justify-content:center;gap:.5rem}.home-subtitle{font-size:1.25rem;color:var(--secondary-color);font-weight:600;max-width:600px;margin:0 auto;line-height:1.6}.categories-container{display:flex;flex-direction:column;gap:4rem}.category-section{display:flex;flex-direction:column}.category-title{font-size:1.5rem;font-weight:700;color:var(--secondary-color);margin:0 0 2rem;padding-bottom:.5rem}.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));row-gap:1.5rem;column-gap:2rem}.tool-item{display:flex;align-items:center;gap:1rem;padding:.5rem;border-radius:8px;text-decoration:none;color:var(--text-main);transition:background-color .2s ease,color .2s ease}.tool-icon{display:flex;align-items:center;justify-content:center;color:var(--text-secondary);transition:color .2s ease}.tool-name{font-size:1.1rem;font-weight:500;transition:color .2s ease}.tool-item:hover{background-color:#f0f4ff}.tool-item:hover .tool-icon,.tool-item:hover .tool-name{color:var(--primary-color)}@media(max-width:768px){.home-container{padding:2rem 1rem}.home-title{font-size:2.5rem}.home-subtitle{font-size:1.1rem}.tools-grid{grid-template-columns:1fr;row-gap:1.2rem}}.tuner-container{max-width:800px;margin:0 auto;padding:4rem 2rem;color:var(--text-main);text-align:center;position:relative;font-family:Inter,sans-serif}.tuner-header{margin-bottom:3rem}.tuner-title{font-size:2.5rem;font-weight:800;margin:0 0 1rem;color:var(--secondary-color)}.tuner-subtitle{font-size:1.25rem;color:var(--text-secondary);margin-bottom:2rem}.tuner-display{background:#fff;border-radius:16px;padding:3rem 2rem;box-shadow:var(--shadow-lg);border:1px solid var(--border-color);display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:400px;position:relative;max-width:600px;margin:0 auto}.start-button,.stop-button{padding:1rem 2rem;font-size:1.1rem;font-weight:700;border:none;border-radius:50px;cursor:pointer;transition:all .2s ease;box-shadow:var(--shadow-md)}.start-button{background-color:var(--primary-color);color:#fff;font-size:1.25rem;padding:1.5rem 3rem}.start-button:hover{background-color:var(--primary-hover);transform:translateY(-2px);box-shadow:var(--shadow-lg)}.stop-button{background:#fff;border:1px solid var(--border-color);color:var(--text-secondary);margin-top:2rem;font-size:1rem;padding:.8rem 2rem}.stop-button:hover{background-color:#f5f5f5;color:var(--accent-color);border-color:var(--accent-color)}.frequency-display{font-family:JetBrains Mono,monospace;font-size:1.1rem;color:var(--text-secondary);letter-spacing:1px;margin-bottom:1rem;font-weight:500}.note-display{display:flex;align-items:flex-start;justify-content:center;margin-bottom:2rem;position:relative;height:140px}.note-name{font-size:8rem;font-weight:800;line-height:1;color:var(--secondary-color);background:linear-gradient(180deg,var(--secondary-color) 0%,var(--primary-color) 100%);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.octave{font-size:2.5rem;font-weight:400;color:var(--text-secondary);margin-left:10px;margin-top:15px}.listening-text{font-size:1.5rem;color:var(--text-secondary);animation:pulse 2s infinite}@keyframes pulse{0%,to{opacity:.5}50%{opacity:1}}.cents-meter{width:100%;height:60px;position:relative;margin:20px 0;mask-image:linear-gradient(to right,transparent,black 10%,black 90%,transparent);-webkit-mask-image:linear-gradient(to right,transparent,black 10%,black 90%,transparent)}.ruler-background{display:flex;justify-content:space-between;align-items:flex-end;height:100%;padding:0 10%;position:relative}.tick{width:1px;background-color:#ddd;height:15px}.tick.major{height:25px;background-color:#bbb;width:2px}.tick.center{height:35px;width:3px;background-color:#4caf50}.tuner-needle{position:absolute;top:0;left:50%;height:100%;width:3px;background-color:var(--accent-color);transform:translate(-50%);transition:left .1s cubic-bezier(.2,.8,.2,1);z-index:10}.tuner-needle:after{content:"";position:absolute;top:0;left:50%;transform:translate(-50%);width:10px;height:10px;background-color:inherit;border-radius:50%}.tuner-needle.in-tune{background-color:#4caf50;box-shadow:0 0 10px #4caf5080}.cents-value{font-family:JetBrains Mono,monospace;font-size:1.2rem;color:var(--text-secondary);font-weight:700;margin-top:1rem}.cents-value.in-tune{color:#4caf50}.error-message{color:#d32f2f;background:#ffebee;padding:1rem 2rem;border-radius:8px;margin-bottom:2rem;border:1px solid #ffcdd2}@media(max-width:768px){.tuner-container{padding:2rem 1rem}.tuner-display{padding:2rem 1rem;min-height:350px}.note-name{font-size:6rem}}.converter-container{max-width:1000px;margin:0 auto;padding:4rem 2rem;color:var(--text-main);text-align:center}.converter-header{margin-bottom:3rem}.back-link{display:none}.converter-title{font-size:2.5rem;font-weight:800;margin:0 0 1rem;color:var(--secondary-color)}.converter-subtitle{font-size:1.25rem;color:var(--text-secondary);margin-bottom:3rem}.upload-area{background-color:var(--primary-color);color:#fff;border-radius:12px;padding:4rem 2rem;text-align:center;cursor:pointer;transition:all .3s ease;margin-bottom:2.5rem;box-shadow:var(--shadow-lg);display:flex;flex-direction:column;align-items:center;justify-content:center;max-width:600px;margin:0 auto 3rem}.upload-area:hover{background-color:var(--primary-hover);transform:scale(1.02)}.upload-area div{font-size:4rem;margin-bottom:1rem;filter:drop-shadow(0 2px 4px rgba(0,0,0,.2))}.upload-area p.main-text{font-size:1.5rem;font-weight:700;margin-bottom:.5rem;text-shadow:0 1px 2px rgba(0,0,0,.1)}.upload-area p.sub-text{color:#ffffffe6;font-size:1rem}.file-list-section{background:#fff;border:1px solid var(--border-color);border-radius:12px;padding:1.5rem;margin-bottom:2rem;text-align:left;box-shadow:var(--shadow-sm)}.section-title{font-size:1.1rem;color:var(--text-secondary);margin-bottom:1rem;font-weight:600;border-bottom:1px solid var(--border-color);padding-bottom:.5rem}.file-tags{display:flex;flex-direction:column;gap:.5rem}.file-tag{background:#f9f9f9;border-bottom:1px solid #eee;padding:.75rem 1rem;display:flex;align-items:center;justify-content:space-between;font-size:.95rem;color:#333}.file-tag:last-child{border-bottom:none}.remove-btn{background:transparent;color:#999;border:none;font-size:1.2rem;cursor:pointer;box-shadow:none;padding:0}.remove-btn:hover{color:var(--accent-color);background:transparent;box-shadow:none;transform:none}.controls-section{background:#fff;border:1px solid var(--border-color);border-radius:12px;padding:1.5rem;margin-bottom:2rem;box-shadow:var(--shadow-sm)}.quality-control{display:flex;align-items:center;justify-content:center;gap:1.5rem}.quality-label{font-weight:600;color:var(--text-main)}.convert-btn{width:100%;max-width:400px;padding:1.25rem;font-size:1.25rem;border-radius:50px;box-shadow:var(--shadow-lg)}.results-grid{display:grid;gap:1rem;text-align:left}.result-card{background:#fff;padding:1.2rem;border-radius:10px;display:flex;justify-content:space-between;align-items:center;border:1px solid var(--border-color);box-shadow:var(--shadow-sm)}.file-info-main{color:var(--text-main);font-weight:600}.download-btn{background-color:var(--secondary-color);color:#fff;padding:.5rem 1rem;border-radius:6px;font-size:.9rem}.download-btn:hover{background-color:#000;color:#fff}@media(max-width:768px){.converter-container{padding:2rem 1rem}.converter-title{font-size:1.8rem}.upload-area{padding:3rem 1.5rem;margin-bottom:1.5rem}.upload-area p.main-text{font-size:1.2rem}.quality-control{flex-direction:column;gap:.5rem;align-items:flex-start}}.converter-container{padding:3rem 2rem;max-width:900px;margin:0 auto;display:flex;flex-direction:column;gap:3rem}.converter-header{text-align:center}.converter-header h1{font-size:2.5rem;font-weight:800;color:var(--secondary-color);margin-bottom:.5rem}.converter-header p{font-size:1.1rem;color:var(--text-secondary)}.converter-content{background:#fff;border-radius:16px;padding:2.5rem;box-shadow:var(--shadow-md);border:1px solid var(--border-color)}.upload-area{border:2px dashed #cbd5e1;border-radius:12px;padding:4rem 2rem;display:flex;flex-direction:column;align-items:center;justify-content:center;cursor:pointer;transition:all .3s ease;background-color:#f8fafc}.upload-area:hover,.upload-area.drag-active{border-color:var(--primary-color);background-color:#f0f4ff}.upload-icon-container{background-color:#fff;width:80px;height:80px;border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-sm);margin-bottom:1.5rem;color:#4b6cb7}.upload-area h3{margin:0 0 .5rem;font-size:1.25rem;color:var(--secondary-color)}.upload-area p{margin:0;color:#64748b}.file-ready-area{display:flex;flex-direction:column;gap:2rem;align-items:center;padding:2rem 0}.file-info-card{display:flex;align-items:center;background-color:#f8fafc;border:1px solid #e2e8f0;padding:1rem 1.5rem;border-radius:8px;width:100%;max-width:500px;gap:1rem}.file-info-icon{color:var(--primary-color)}.file-details{display:flex;flex-direction:column;flex:1}.file-name{font-weight:600;color:var(--secondary-color);word-break:break-all}.file-size{font-size:.85rem;color:#64748b}.remove-file-btn{background:transparent;border:none;color:#94a3b8;padding:.5rem;box-shadow:none;display:flex;align-items:center;justify-content:center}.remove-file-btn:hover{background:transparent;color:#ef4444;transform:none;box-shadow:none}.convert-btn{display:flex;align-items:center;gap:.5rem;padding:1rem 2.5rem;font-size:1.1rem;border-radius:50px}.convert-btn:disabled{background-color:#94a3b8;cursor:not-allowed;transform:none;box-shadow:none}.error-message{display:flex;align-items:center;gap:.5rem;margin-top:1.5rem;padding:1rem;background-color:#fef2f2;color:#ef4444;border-radius:8px;border:1px solid #fecaca;color:#b91c1c}.instructions-section{margin-top:1rem;border-top:1px solid var(--border-color);padding-top:3rem}.instructions-section h2{text-align:center;margin-bottom:2rem}.steps-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:2rem}.step{background:#fff;padding:2rem;border-radius:12px;box-shadow:var(--shadow-sm);border:1px solid var(--border-color);display:flex;flex-direction:column;align-items:center;text-align:center}.step-number{width:40px;height:40px;background-color:var(--primary-color);color:#fff;display:flex;align-items:center;justify-content:center;border-radius:50%;font-weight:700;font-size:1.25rem;margin-bottom:1rem}.step h3{font-size:1.25rem;margin-bottom:.5rem;color:var(--secondary-color)}.step p{color:var(--text-secondary);font-size:.95rem;line-height:1.6;margin:0}@media(max-width:768px){.converter-container{padding:2rem 1rem}.converter-header h1{font-size:2rem}.upload-area{padding:3rem 1rem}}