:root{--background-gradient-start: #0d1117;--background-gradient-end: #161b22;--card-background: #1c2128;--primary-text: #c9d1d9;--secondary-text: #8b949e;--glow-color-1: #00d1ff;--glow-color-2: #8257e5;--border-color: #30363d;--shadow-color: rgba(0, 209, 255, .1);--error-color: #f85149}@keyframes flicker{0%,18%,22%,25%,53%,57%,to{text-shadow:0 0 4px var(--glow-color-1),0 0 10px var(--glow-color-1),0 0 20px var(--glow-color-1),0 0 40px var(--glow-color-2),0 0 80px var(--glow-color-2)}20%,24%,55%{text-shadow:none}}@keyframes rotateGlow{0%{transform:rotate(0)}to{transform:rotate(360deg)}}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,sans-serif;background-image:linear-gradient(135deg,var(--background-gradient-start),var(--background-gradient-end));color:var(--primary-text);line-height:1.6;min-height:100vh;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}#app{max-width:600px;margin:2rem auto;padding:1rem}header{text-align:center;margin-bottom:2.5rem}header h1{font-size:2.5rem;font-weight:700;margin-bottom:.5rem;background:linear-gradient(90deg,var(--glow-color-1),var(--glow-color-2));-webkit-background-clip:text;-webkit-text-fill-color:transparent;animation:flicker 5s infinite linear}header p{font-size:1rem;color:var(--secondary-text)}.main-card{background-color:var(--card-background);border-radius:16px;padding:2rem;position:relative;overflow:hidden;border:1px solid var(--border-color)}.main-card:before{content:"";position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:conic-gradient(transparent,var(--glow-color-1),var(--glow-color-2),transparent);animation:rotateGlow 6s linear infinite;z-index:1}.main-card>*{position:relative;z-index:2}.converter-row{display:flex;gap:1.5rem;align-items:flex-end;margin-bottom:1.5rem}.units-row{align-items:center}.input-group{flex:1;display:flex;flex-direction:column}.input-group label{font-size:.875rem;font-weight:600;margin-bottom:.5rem;color:var(--secondary-text)}input[type=number],input[type=time],select{width:100%;padding:.75rem;font-size:1rem;border:1px solid var(--border-color);border-radius:8px;background-color:var(--background-gradient-start);color:var(--primary-text);transition:border-color .2s,box-shadow .2s}input[type=number]:focus,input[type=time]:focus,select:focus{outline:none;border-color:var(--glow-color-1);box-shadow:0 0 0 3px #00d1ff33}select{-moz-appearance:none;-webkit-appearance:none;appearance:none;background-image:url(data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%238b949e%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E);background-repeat:no-repeat;background-position:right .7em top 50%,0 0;background-size:.65em auto,100%}optgroup{background-color:var(--background-gradient-end);color:var(--primary-text);font-weight:700}#swap-button{display:flex;align-items:center;justify-content:center;height:48px;width:48px;border:1px solid var(--border-color);background-color:transparent;color:var(--secondary-text);border-radius:50%;cursor:pointer;transition:all .3s ease;margin-top:1.2rem}#swap-button:hover{background-color:#00d1ff1a;color:var(--glow-color-1);transform:rotate(180deg);border-color:var(--glow-color-1)}#swap-button svg{width:20px;height:20px}#result-container{text-align:center;margin:1.5rem 0;padding:1rem;background-color:#0003;border-radius:8px}#result-text{font-size:1.75rem;font-weight:700;word-break:break-all;color:var(--glow-color-1);text-shadow:0 0 5px rgba(0,209,255,.5),0 0 10px rgba(0,209,255,.3)}.ai-section{display:flex;flex-direction:column;align-items:center;margin-top:2rem;padding-top:2rem;border-top:1px solid var(--border-color)}#explain-button{display:flex;align-items:center;justify-content:center;width:100%;padding:.8rem 1rem;font-size:1rem;font-weight:600;border:none;border-radius:8px;background:linear-gradient(90deg,var(--glow-color-1),var(--glow-color-2));color:#fff;cursor:pointer;transition:all .3s ease;box-shadow:0 0 15px #8257e54d}#explain-button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 4px 20px #8257e580}#explain-button:disabled{background:var(--border-color);cursor:not-allowed;box-shadow:none}#explanation-container{width:100%;margin-top:1.5rem;padding:1rem 1.5rem;border:1px solid var(--border-color);border-radius:8px;background-color:var(--background-gradient-start)}#explanation-container.hidden{display:none}#explanation-container h1,#explanation-container h2,#explanation-container h3{margin-top:1rem;margin-bottom:.5rem;color:var(--glow-color-1)}#explanation-container p{margin-bottom:1rem;color:var(--primary-text)}#explanation-container code{background-color:var(--border-color);padding:2px 6px;border-radius:4px;font-family:monospace;color:var(--glow-color-1)}.error{color:var(--error-color);font-weight:700}#loader{width:18px;height:18px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin 1s linear infinite;margin-left:.5rem}#loader.hidden{display:none}@keyframes spin{to{transform:rotate(360deg)}}@media(max-width:640px){body{font-size:14px}#app{margin:1rem auto;padding:.5rem}.main-card{padding:1.5rem}header h1{font-size:2rem}.converter-row.units-row{flex-direction:column;align-items:stretch}#swap-button{align-self:center;transform:rotate(90deg);margin:.5rem 0}#swap-button:hover{transform:rotate(270deg)}#result-text{font-size:1.25rem}}