:root{--bg-primary: #0d1117;--bg-secondary: #161b22;--bg-tertiary: #21262d;--bg-card: #1c2128;--border: #30363d;--text-primary: #e6edf3;--text-secondary: #8b949e;--text-muted: #6e7681;--accent: #58a6ff;--accent-hover: #79c0ff;--success: #3fb950;--warning: #d29922;--error: #f85149;--purple: #a371f7}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Noto Sans,Helvetica,Arial,sans-serif;background-color:var(--bg-primary);color:var(--text-primary);line-height:1.6;min-height:100vh}#root{min-height:100vh}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.app{min-height:100vh;display:flex;flex-direction:column}.header{background:var(--bg-secondary);border-bottom:1px solid var(--border);padding:1rem 1.5rem;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:100}.logo{display:flex;align-items:center;gap:.75rem}.logo-icon{width:32px;height:32px;background:linear-gradient(135deg,var(--accent),var(--purple));border-radius:8px;display:flex;align-items:center;justify-content:center}.logo h1{font-size:1.25rem;font-weight:600;background:linear-gradient(135deg,var(--text-primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.tagline{font-size:.75rem;color:var(--text-muted)}.main{flex:1;display:grid;grid-template-columns:320px 1fr;gap:0;height:calc(100vh - 65px)}.sidebar{background:var(--bg-secondary);border-right:1px solid var(--border);overflow-y:auto;padding:1rem}.sidebar-title{font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);margin-bottom:1rem}.category{margin-bottom:1.5rem}.category-title{font-size:.875rem;font-weight:500;color:var(--text-secondary);margin-bottom:.5rem;display:flex;align-items:center;gap:.5rem}.template-list{display:flex;flex-direction:column;gap:.25rem}.template-btn{width:100%;text-align:left;padding:.625rem .75rem;background:transparent;border:1px solid transparent;border-radius:6px;color:var(--text-secondary);font-size:.875rem;cursor:pointer;transition:all .15s ease;display:flex;align-items:center;gap:.5rem}.template-btn:hover{background:var(--bg-tertiary);color:var(--text-primary)}.template-btn.active{background:var(--bg-tertiary);border-color:var(--accent);color:var(--text-primary)}.template-btn svg{width:16px;height:16px;flex-shrink:0}.editor{display:flex;flex-direction:column;overflow:hidden}.editor-header{padding:1rem 1.5rem;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}.template-name{font-size:1rem;font-weight:600}.template-desc{font-size:.875rem;color:var(--text-secondary)}.form-section{padding:1.5rem;border-bottom:1px solid var(--border);background:var(--bg-secondary)}.form-title{font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);margin-bottom:1rem}.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem}.form-group{display:flex;flex-direction:column;gap:.375rem}.form-group.full-width{grid-column:1 / -1}.form-label{font-size:.8125rem;font-weight:500;color:var(--text-secondary)}.form-input,.form-textarea{padding:.625rem .75rem;background:var(--bg-primary);border:1px solid var(--border);border-radius:6px;color:var(--text-primary);font-size:.875rem;font-family:inherit;transition:border-color .15s ease}.form-input:focus,.form-textarea:focus{outline:none;border-color:var(--accent)}.form-textarea{min-height:100px;resize:vertical}.preview-section{flex:1;padding:1.5rem;overflow-y:auto;background:var(--bg-primary)}.preview-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem}.preview-title{font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted)}.copy-btn{display:flex;align-items:center;gap:.5rem;padding:.5rem 1rem;background:var(--accent);color:#fff;border:none;border-radius:6px;font-size:.875rem;font-weight:500;cursor:pointer;transition:all .15s ease}.copy-btn:hover{background:var(--accent-hover)}.copy-btn.copied{background:var(--success)}.copy-btn svg{width:16px;height:16px}.email-preview{background:var(--bg-card);border:1px solid var(--border);border-radius:8px;padding:1.5rem;white-space:pre-wrap;font-size:.875rem;line-height:1.7;color:var(--text-primary)}.footer{background:var(--bg-secondary);border-top:1px solid var(--border);padding:.75rem 1.5rem;display:flex;align-items:center;justify-content:center;gap:.5rem;font-size:.75rem;color:var(--text-muted)}.footer a{color:var(--accent);text-decoration:none}.footer a:hover{text-decoration:underline}.toast{position:fixed;bottom:2rem;right:2rem;background:var(--success);color:#fff;padding:.75rem 1.25rem;border-radius:8px;font-size:.875rem;font-weight:500;display:flex;align-items:center;gap:.5rem;animation:slideIn .3s ease;z-index:1000}.toast svg{width:18px;height:18px}@keyframes slideIn{0%{opacity:0;transform:translateY(1rem)}to{opacity:1;transform:translateY(0)}}@media(max-width:768px){.main{grid-template-columns:1fr;height:auto}.sidebar{border-right:none;border-bottom:1px solid var(--border);max-height:300px}.form-grid{grid-template-columns:1fr}}