*,*::before,*::after{box-sizing:border-box}html,body{overflow-x:hidden;max-width:100%}img,video,iframe{max-width:100%;height:auto}:root{--primary-color:#6c63ff;--primary-light:#a29bfe;--primary-dark:#4b44cc;--secondary-color:#ff6584;--accent-color:#63ff9e;--error-color:#ff4757;--text-color:#2d3436;--text-light:#636e72;--text-lighter:#b2bec3;--bg-color:#f9f9ff;--bg-secondary:#ffffff;--border-color:#dfe6e9;--shadow:0 8px 30px rgba(0,0,0,0.08);--shadow-hover:0 12px 40px rgba(108,99,255,0.15);--transition:all 0.3s cubic-bezier(0.25,0.8,0.25,1);--border-radius:12px;--gradient:linear-gradient(135deg,#6c63ff 0%,#a29bfe 100%);--youtube-red:#ff0000}[data-theme="dark"]{--text-color:#f5f6fa;--text-light:#dcdde1;--text-lighter:#7f8fa6;--bg-color:#1e272e;--bg-secondary:#2f3640;--border-color:#353b48;--shadow:0 8px 30px rgba(0,0,0,0.2);--shadow-hover:0 12px 40px rgba(108,99,255,0.25)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;line-height:1.6;color:var(--text-color);background-color:var(--bg-color);transition:var(--transition);-webkit-font-smoothing:antialiased;display:flex;flex-direction:column;min-height:100vh}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 1.5rem}.tool-header{background:var(--gradient);padding:2rem 0;margin-bottom:3rem;position:relative;overflow:hidden;box-shadow:0 4px 20px rgba(108,99,255,0.15)}.tool-header::before{content:"";position:absolute;top:0;left:0;width:100%;height:100%;background:url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="none"><path fill="rgba(255,255,255,0.05)" d="M0,0 L100,0 L100,100 L0,100 Z"></path></svg>');background-size:cover}.header-content{position:relative;z-index:2}.back-button{display:inline-flex;align-items:center;gap:0.5rem;color:white;text-decoration:none;font-weight:500;margin-bottom:1.5rem;transition:var(--transition);background:rgba(255,255,255,0.15);backdrop-filter:blur(5px);padding:0.5rem 1rem;border-radius:50px;border:1px solid rgba(255,255,255,0.2)}.back-button:hover{background:rgba(255,255,255,0.25);transform:translateX(-3px)}.tool-meta h1{font-size:2.5rem;margin-bottom:0.5rem;display:flex;align-items:center;gap:1rem;color:white;font-weight:700}.tool-meta p{color:rgba(255,255,255,0.9);font-size:1.2rem;max-width:600px}.tool-main{flex:1;padding-bottom:3rem}.tool-card{background-color:var(--bg-secondary);border-radius:var(--border-radius);box-shadow:var(--shadow);overflow:hidden;margin-bottom:3rem;transition:var(--transition);border:1px solid var(--border-color)}.tool-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-5px)}.input-section,.control-section,.results-section,.error-section{padding:2rem}.section-header{margin-bottom:1.5rem}.section-header h2{display:flex;align-items:center;gap:0.75rem;font-size:1.5rem}.url-input-container{position:relative;display:flex;margin-bottom:1rem}.url-input{width:100%;padding:1rem 1.25rem;padding-right:3.5rem;border:2px solid var(--border-color);border-radius:var(--border-radius);font-size:1rem;background-color:var(--bg-secondary);color:var(--text-color);transition:var(--transition)}.url-input:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 4px rgba(108,99,255,0.15)}.paste-btn{position:absolute;right:0.75rem;top:50%;transform:translateY(-50%);background:transparent;border:none;color:var(--text-light);cursor:pointer;transition:var(--transition);width:2.5rem;height:2.5rem;display:flex;align-items:center;justify-content:center;border-radius:50%}.paste-btn:hover{color:var(--primary-color);background:rgba(108,99,255,0.1)}.url-examples{display:flex;align-items:center;gap:0.75rem;flex-wrap:wrap;font-size:0.9rem;color:var(--text-light)}.url-examples span{font-weight:500}.url-examples button{background:none;border:none;color:var(--primary-color);text-decoration:underline;cursor:pointer;transition:var(--transition);font-size:0.9rem}.url-examples button:hover{color:var(--primary-dark)}.control-section{display:flex;flex-direction:column;gap:1.5rem;align-items:center;border-top:1px solid var(--border-color);border-bottom:1px solid var(--border-color)}.convert-btn{width:100%;max-width:300px}.manual-time{width:100%;text-align:center}.manual-time label{display:block;margin-bottom:0.75rem;font-weight:500;color:var(--text-light)}.time-inputs{display:flex;justify-content:center;align-items:center;gap:0.5rem}.time-inputs input{width:60px;padding:0.5rem;text-align:center;border:2px solid var(--border-color);border-radius:var(--border-radius);font-size:1rem;transition:var(--transition)}.time-inputs input:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 2px rgba(108,99,255,0.15)}.time-inputs span{font-weight:bold;color:var(--text-light)}.results-section{display:none}.result-card{margin-bottom:2rem}.timestamp-output{font-size:2.5rem;font-weight:700;text-align:center;margin:1.5rem 0;font-family:'Courier New',monospace;color:var(--primary-color)}.copy-buttons{display:flex;justify-content:center;gap:1rem;flex-wrap:wrap}.video-info{display:flex;gap:1.5rem;padding:1.5rem;background:var(--bg-color);border-radius:var(--border-radius);border:1px solid var(--border-color)}.thumbnail-container{width:160px;height:90px;border-radius:8px;overflow:hidden;flex-shrink:0}.thumbnail-container img{width:100%;height:100%;object-fit:cover}.video-details{flex:1}.video-details h3{font-size:1.1rem;margin-bottom:0.75rem;line-height:1.4}.video-meta{display:flex;gap:1.5rem;font-size:0.9rem;color:var(--text-light)}.video-meta span{display:flex;align-items:center;gap:0.5rem}.error-section{display:none}.error-card{text-align:center;padding:2rem}.error-card i{font-size:3rem;color:var(--error-color);margin-bottom:1.5rem}.error-message{font-size:1.1rem;margin-bottom:1.5rem;color:var(--text-color)}.btn-primary,.btn-secondary,.btn-tertiary,.btn-copy{padding:0.85rem 1.75rem;border:none;border-radius:50px;font-size:1rem;font-weight:600;cursor:pointer;display:inline-flex;align-items:center;gap:0.75rem;transition:var(--transition)}.btn-primary{background:var(--gradient);color:white;box-shadow:0 4px 15px rgba(108,99,255,0.3)}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(108,99,255,0.4)}.btn-secondary{background-color:transparent;color:var(--primary-color);border:2px solid var(--primary-color)}.btn-secondary:hover{background-color:rgba(108,99,255,0.05);transform:translateY(-2px)}.btn-tertiary{background-color:transparent;color:var(--secondary-color);border:2px solid var(--secondary-color)}.btn-tertiary:hover{background-color:rgba(255,101,132,0.05);transform:translateY(-2px)}.btn-copy{background-color:transparent;color:var(--primary-color);padding:0.5rem 1.25rem;font-weight:500}.btn-copy:hover{background-color:rgba(108,99,255,0.05);transform:translateY(-2px)}footer{background:var(--bg-secondary);padding:3rem 0 1.5rem;margin-top:auto;border-top:1px solid var(--border-color)}.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:2rem;margin-bottom:2rem}.footer-col{margin-bottom:1.5rem}.footer-col h4{font-size:1.1rem;margin-bottom:1rem;color:var(--primary-color)}.footer-logo{font-size:1.5rem;font-weight:700;margin-bottom:0.75rem;display:flex;align-items:center;gap:0.5rem;color:var(--primary-color)}.footer-tagline{font-size:0.9rem;color:var(--text-light);margin-bottom:1.5rem}.footer-social{display:flex;gap:1rem}.footer-social a{color:var(--text-light);font-size:1.25rem;transition:var(--transition)}.footer-social a:hover{color:var(--primary-color);transform:translateY(-2px)}.footer-col ul{list-style:none}.footer-col ul li{margin-bottom:0.75rem}.footer-col ul li a{color:var(--text-light);text-decoration:none;transition:var(--transition);font-size:0.9rem}.footer-col ul li a:hover{color:var(--primary-color);padding-left:5px}.newsletter-form .input-group{display:flex}.newsletter-form input{flex:1;padding:0.75rem;border:1px solid var(--border-color);border-radius:var(--border-radius) 0 0 var(--border-radius);font-size:0.9rem;background:var(--bg-color);color:var(--text-color)}.newsletter-form button{border-radius:0 var(--border-radius) var(--border-radius) 0;padding:0 1.25rem}.footer-bottom{display:flex;justify-content:space-between;align-items:center;padding-top:1.5rem;border-top:1px solid var(--border-color);flex-wrap:wrap;gap:1rem}.copyright{font-size:0.85rem;color:var(--text-light)}.footer-links{display:flex;gap:1.5rem}.footer-links a{font-size:0.85rem;color:var(--text-light);text-decoration:none;transition:var(--transition)}.footer-links a:hover{color:var(--primary-color)}.back-to-top{position:fixed;bottom:1.5rem;right:1.5rem;width:3rem;height:3rem;border-radius:50%;background:var(--gradient);color:white;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:var(--transition);z-index:100}.back-to-top.visible{opacity:1;visibility:visible}.back-to-top:hover{transform:translateY(-5px);box-shadow:var(--shadow-hover)}.hidden{display:none!important}@media (max-width:992px){.video-info{flex-direction:column}.thumbnail-container{width:100%;height:auto;aspect-ratio:16/9}}@media (max-width:768px){.tool-meta h1{font-size:2rem}.tool-meta p{font-size:1.1rem}.input-section,.control-section,.results-section,.error-section{padding:1.5rem}.timestamp-output{font-size:2rem}.footer-grid{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}}@media (max-width:480px){.tool-header{padding:1.5rem 0}.tool-meta h1{font-size:1.75rem;gap:0.75rem}.back-button{padding:0.4rem 0.8rem;font-size:0.9rem}.url-input{padding:0.85rem 1rem;padding-right:3rem}.time-inputs input{width:50px;padding:0.4rem}.timestamp-output{font-size:1.75rem}.video-meta{flex-direction:column;gap:0.5rem}.footer-bottom{flex-direction:column;align-items:flex-start}.footer-links{gap:1rem}.back-to-top{width:2.5rem;height:2.5rem;bottom:1rem;right:1rem}}