:root{--primary-color: #646cff;--primary-hover: #535bf2;--background-color: #242424;--text-color: rgba(255, 255, 255, .87);--text-color-muted: rgba(255, 255, 255, .7);--border-color: #444;--input-background: #1a1a1a;--focus-ring-color: #646cff40}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;background-color:var(--background-color);color:var(--text-color);min-height:100vh;display:flex;flex-direction:column}.container{width:100%;max-width:800px;margin:0 auto;padding:2rem}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;white-space:nowrap;border:0}.header{text-align:center;padding:2rem 0;background-color:#0003}.header h1{font-size:2.5rem;margin-bottom:1rem}.subtitle{font-size:1.1rem;color:var(--text-color-muted)}.main{flex:1;padding:2rem 0}.url-shortener-section{max-width:600px;margin:0 auto}.url-form{display:flex;flex-direction:column;gap:1.5rem}.form-group{display:flex;flex-direction:column;gap:.5rem}.form-label{font-weight:500}.form-help{font-size:.875rem;color:var(--text-color-muted)}.url-input,.short-url-input{padding:1rem;border-radius:8px;border:1px solid var(--border-color);background-color:var(--input-background);color:var(--text-color);font-size:1rem}.url-input{transition:border-color .3s,box-shadow .3s}.short-url-input{flex:1;padding:.75rem;cursor:text}.submit-button,.copy-button{border-radius:8px;border:none;background-color:var(--primary-color);color:#fff;font-size:1rem;font-weight:500;cursor:pointer;transition:background-color .3s,transform .1s}.submit-button{padding:1rem}.copy-button{padding:.75rem 1.5rem}.submit-button:hover,.copy-button:hover{background-color:var(--primary-hover)}.submit-button:active,.copy-button:active{transform:translateY(1px)}.submit-button:focus,.copy-button:focus,.url-input:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px var(--focus-ring-color)}.url-output{margin-top:2rem;padding:1.5rem;background-color:#0003;border-radius:8px;border:1px solid var(--border-color)}.url-output.hidden{display:none}.url-output h3{margin-bottom:1rem;font-size:1.2rem}.output-container{display:flex;gap:.5rem}.url-preview{margin-top:1rem;text-align:center}.url-preview p{color:var(--text-color-muted);font-size:.9rem;margin-bottom:.5rem}.preview-link{color:var(--primary-color);text-decoration:none;font-size:1rem;word-break:break-all;transition:color .3s}.preview-link:hover{color:var(--primary-hover);text-decoration:underline}@media (max-width: 600px){.container{padding:1rem}.header h1{font-size:2rem}}.loading-container{position:fixed;top:0;left:0;width:100%;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;background-color:var(--background-color);z-index:1000}.loading-container.hidden{display:none}.loading-text{margin-top:1rem;font-size:1.2rem;color:var(--text-color)}.loading-spinner{width:50px;height:50px;border:5px solid var(--border-color);border-top-color:var(--primary-color);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}