*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;--bg: #f0f2f5;--card-bg: #ffffff;--text: #1a1a2e;--text-secondary: #64748b;--border: #e2e8f0;--accent: #6366f1;--accent-hover: #4f46e5;--accent-light: #eef2ff;--shadow: 0 4px 24px rgba(0, 0, 0, .08);--radius: 12px;--radius-sm: 8px;--success: #10b981;--error: #ef4444;--transition: .2s ease}body.dark{--bg: #0f172a;--card-bg: #1e293b;--text: #f1f5f9;--text-secondary: #94a3b8;--border: #334155;--accent: #818cf8;--accent-hover: #6366f1;--accent-light: #1e1b4b;--shadow: 0 4px 24px rgba(0, 0, 0, .3)}body{font-family:var(--font);background:var(--bg);color:var(--text);min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;transition:background var(--transition),color var(--transition)}#theme-toggle{position:fixed;top:16px;right:16px;background:var(--card-bg);border:1px solid var(--border);border-radius:50%;width:40px;height:40px;display:flex;align-items:center;justify-content:center;font-size:20px;cursor:pointer;box-shadow:var(--shadow);transition:background var(--transition),border var(--transition),transform var(--transition);z-index:10}#theme-toggle:hover{transform:scale(1.1)}main{width:100%;max-width:480px}.card{background:var(--card-bg);border-radius:var(--radius);padding:40px 32px;box-shadow:var(--shadow);transition:background var(--transition),box-shadow var(--transition)}h1{font-size:28px;font-weight:700;letter-spacing:-.02em}.subtitle{color:var(--text-secondary);font-size:14px;margin-top:2px;margin-bottom:28px}.field{margin-bottom:20px}.field label{display:block;font-size:13px;font-weight:600;margin-bottom:6px;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.04em}.field input{width:100%;padding:12px 14px;font-size:15px;font-family:var(--font);border:1.5px solid var(--border);border-radius:var(--radius-sm);background:var(--card-bg);color:var(--text);outline:none;transition:border var(--transition),background var(--transition),color var(--transition)}.field input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-light)}.field input::placeholder{color:var(--text-secondary);opacity:.6}.link-btn{background:none;border:none;color:var(--accent);font-size:13px;font-weight:600;cursor:pointer;padding:0;font-family:var(--font);transition:color var(--transition)}.link-btn:hover{color:var(--accent-hover)}.hidden{display:none!important}#custom-key-wrapper{margin-top:12px}#submit-btn{width:100%;padding:14px;font-size:15px;font-weight:600;font-family:var(--font);background:var(--accent);color:#fff;border:none;border-radius:var(--radius-sm);cursor:pointer;transition:background var(--transition),transform var(--transition);display:flex;align-items:center;justify-content:center;gap:8px}#submit-btn:hover{background:var(--accent-hover)}#submit-btn:active{transform:scale(.98)}#submit-btn:disabled{opacity:.7;cursor:not-allowed;transform:none}.spinner{animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}#result{margin-top:24px;animation:fadeSlideUp .3s ease}.result-card{background:var(--accent-light);border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px;transition:background var(--transition),border var(--transition)}.result-label{font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-secondary);margin-bottom:8px}.result-row{display:flex;align-items:center;gap:8px}.result-row a{flex:1;color:var(--accent);font-weight:600;font-size:14px;word-break:break-all;text-decoration:none;transition:color var(--transition)}.result-row a:hover{color:var(--accent-hover);text-decoration:underline}.icon-btn{background:none;border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px;cursor:pointer;color:var(--text-secondary);display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background var(--transition),border var(--transition),color var(--transition)}.icon-btn:hover{background:var(--card-bg);color:var(--accent);border-color:var(--accent)}.icon-btn.copied{color:var(--success);border-color:var(--success)}#error{margin-top:20px;padding:14px;background:#fef2f2;border:1px solid #fecaca;border-radius:var(--radius-sm);animation:fadeSlideUp .3s ease}body.dark #error{background:#450a0a;border-color:#991b1b}#error-text{color:var(--error);font-size:14px;font-weight:500}@keyframes fadeSlideUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@media(max-width:520px){.card{padding:28px 20px}h1{font-size:24px}}