:root{--bg-primary: #ffffff;--bg-secondary: #f8f9fa;--text-primary: #1a1a1a;--text-secondary: #4a4a4a;--accent-color: #2563eb;--accent-hover: #1d4ed8;--border-color: #e5e7eb;--input-bg: #ffffff;--input-border: #d1d5db;--error-color: #ef4444;--success-color: #10b981}[data-theme=dark]{--bg-primary: #111827;--bg-secondary: #1f2937;--text-primary: #ffffff;--text-secondary: #e5e7eb;--accent-color: #f97316;--accent-hover: #ea580c;--border-color: #374151;--input-bg: #1f2937;--input-border: #4b5563;--error-color: #f87171;--success-color: #34d399}*{margin:0;padding:0;box-sizing:border-box}body{font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background-color:var(--bg-primary);color:var(--text-primary);line-height:1.5;transition:background-color .3s ease,color .3s ease}.container{max-width:1200px;margin:0 auto;padding:2rem}.form-group{margin-bottom:1.5rem;display:flex;gap:1rem;align-items:center}input[type=text],input[type=url]{flex:1;height:3.5rem;padding:.75rem 1rem;border:1px solid var(--input-border);border-radius:.5rem;background-color:var(--input-bg);color:var(--text-primary);font-size:1rem;transition:border-color .3s ease;-webkit-appearance:none}input[type=text]:focus,input[type=url]:focus{outline:none;border-color:var(--accent-color)}button{height:3.5rem;background-color:var(--accent-color);color:#fff;padding:0 2rem;border:1px solid transparent;border-radius:.5rem;font-size:1rem;cursor:pointer;transition:background-color .3s ease;-webkit-appearance:none}button:hover{background-color:var(--accent-hover)}button:disabled{opacity:.7;cursor:not-allowed}.card{background-color:var(--bg-secondary);border-radius:1rem;padding:2rem;box-shadow:0 4px 6px #0000001a;margin-bottom:2rem}.error-message{color:var(--error-color);margin-top:.5rem;font-size:.875rem}.success-message{color:var(--success-color);margin-top:.5rem;font-size:.875rem}.theme-toggle{position:fixed;top:1rem;right:1rem;background:none;border:none;color:var(--text-primary);cursor:pointer;padding:.5rem;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:background-color .3s ease}.theme-toggle:hover{background-color:var(--bg-secondary)}.short-url-container{text-align:center;margin-top:2rem}.short-url{font-size:1.25rem;color:var(--accent-color);word-break:break-all;margin:1rem 0}.copy-button{margin-top:1rem}.main-title{font-size:2.5rem;margin-bottom:2rem;text-align:center;color:var(--text-primary)}.description{color:var(--text-secondary);text-align:center;margin-bottom:3rem;font-size:1.125rem}.info-card{background-color:var(--bg-secondary);border-radius:1rem;padding:1.5rem;margin-bottom:2rem;border-left:4px solid var(--accent-color)}.info-card p{font-weight:600;margin-bottom:.5rem;color:var(--text-primary)}.info-card ul{list-style-type:none;padding-left:0}.info-card li{margin-bottom:.5rem;color:var(--text-secondary);display:flex;align-items:center}.info-card li:before{content:"•";color:var(--accent-color);margin-right:.5rem}