:root{--bg-base: #0F172A;--bg-surface: #1E293B;--bg-surface-hover: #334155;--bg-surface-active: #475569;--text-primary: #F8FAFC;--text-secondary: #94A3B8;--text-muted: #64748B;--brand-primary: #3B82F6;--brand-primary-hover: #2563EB;--accent-success: #10B981;--accent-danger: #EF4444;--accent-warning: #F59E0B;--border-color: #334155;--font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--transition-fast: .15s ease;--transition-normal: .25s ease;--sidebar-width: 260px;--thread-pane-width: 380px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-family);background-color:var(--bg-base);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow:hidden}a{color:var(--brand-primary);text-decoration:none}button{font-family:inherit;cursor:pointer;border:none;background:none}input,textarea{font-family:inherit}.spinner{border:3px solid rgba(255,255,255,.1);border-radius:50%;border-top:3px solid var(--brand-primary);width:40px;height:40px;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.auth-callback{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100vh;gap:1rem}.auth-callback.error{color:var(--accent-danger)}.auth-callback button{padding:.75rem 1.5rem;background-color:var(--brand-primary);color:#fff;border-radius:6px;font-weight:500;transition:background-color var(--transition-fast)}.auth-callback button:hover{background-color:var(--brand-primary-hover)}.app-layout{display:flex;height:100vh;width:100vw}.sidebar{width:var(--sidebar-width);background-color:var(--bg-surface);border-right:1px solid var(--border-color);display:flex;flex-direction:column;padding:1.5rem 1rem}.sidebar-brand{font-size:1.5rem;font-weight:700;color:var(--text-primary);margin-bottom:2rem;display:flex;align-items:center;gap:.5rem}.compose-btn{background-color:var(--brand-primary);color:#fff;padding:.75rem 1rem;border-radius:8px;font-weight:600;display:flex;align-items:center;justify-content:center;gap:.5rem;margin-bottom:2rem;transition:all var(--transition-fast)}.compose-btn:hover{background-color:var(--brand-primary-hover);transform:scale(1.02);box-shadow:0 0 15px #3b82f666}.nav-item{display:flex;align-items:center;justify-content:space-between;padding:.75rem 1rem;border-radius:6px;color:var(--text-secondary);transition:all var(--transition-fast);margin-bottom:.25rem;font-weight:500}.nav-item:hover,.nav-item.active{background-color:var(--bg-surface-hover);color:var(--text-primary)}.nav-item .left{display:flex;align-items:center;gap:.75rem}.nav-item .badge{background-color:var(--brand-primary);color:#fff;padding:.1rem .5rem;border-radius:9999px;font-size:.75rem;font-weight:600}.thread-pane{width:var(--thread-pane-width);border-right:1px solid var(--border-color);display:flex;flex-direction:column;background-color:var(--bg-base)}.thread-pane-header{padding:1.5rem;border-bottom:1px solid var(--border-color);font-weight:600;font-size:1.25rem;display:flex;align-items:center;justify-content:space-between}.thread-list-container{flex:1;overflow:auto}.thread-item{padding:1rem 1.5rem;border-bottom:1px solid var(--border-color);cursor:pointer;transition:background-color var(--transition-fast);position:relative}.thread-item:hover,.thread-item.active{background-color:var(--bg-surface)}.thread-item.unread{background-color:#3b82f60d}.thread-item.unread .sender{font-weight:700;color:var(--text-primary)}.thread-item.unread .subject{font-weight:600;color:var(--text-primary)}.thread-item.unread:before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background-color:var(--brand-primary)}.thread-item .top-row{display:flex;justify-content:space-between;margin-bottom:.25rem}.thread-item .sender{color:var(--text-secondary);font-size:.95rem}.thread-item .time{font-size:.75rem;color:var(--text-muted)}.thread-item .subject{color:var(--text-secondary);font-size:.9rem;margin-bottom:.25rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.thread-item .snippet{color:var(--text-muted);font-size:.85rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.message-view{flex:1;display:flex;flex-direction:column;background-color:var(--bg-base)}.message-header{padding:2rem;border-bottom:1px solid var(--border-color)}.message-subject{font-size:1.5rem;font-weight:700;margin-bottom:1rem}.message-meta{display:flex;align-items:center;gap:1rem}.avatar{width:40px;height:40px;border-radius:50%;background-color:var(--bg-surface-active);display:flex;align-items:center;justify-content:center;font-weight:600;color:#fff}.sender-info{flex:1}.sender-name{font-weight:600;color:var(--text-primary)}.sender-email{color:var(--text-muted);font-size:.85rem}.message-actions{display:flex;gap:.5rem}.icon-btn{color:var(--text-secondary);padding:.5rem;border-radius:4px;transition:all var(--transition-fast)}.icon-btn:hover{background-color:var(--bg-surface);color:var(--text-primary)}.security-badges{display:flex;gap:.5rem;margin-top:1rem}.badge-sec{padding:.25rem .5rem;border-radius:4px;font-size:.75rem;font-weight:600;display:flex;align-items:center;gap:.25rem}.badge-sec.pass{background-color:#10b9811a;color:var(--accent-success)}.message-body-container{padding:2rem;flex:1;overflow:auto;line-height:1.6}.compose-overlay{position:fixed;bottom:0;right:2rem;width:500px;background-color:var(--bg-surface);border:1px solid var(--border-color);border-top-left-radius:8px;border-top-right-radius:8px;box-shadow:0 -10px 40px #00000080;display:flex;flex-direction:column;z-index:1000}.compose-header{padding:1rem;background-color:var(--bg-surface-hover);border-top-left-radius:8px;border-top-right-radius:8px;display:flex;justify-content:space-between;align-items:center;font-weight:600}.compose-body{padding:1rem;display:flex;flex-direction:column;gap:.5rem}.compose-input{background:none;border:none;border-bottom:1px solid var(--border-color);color:var(--text-primary);padding:.5rem 0;outline:none}.compose-textarea{background:none;border:none;color:var(--text-primary);padding:1rem 0;outline:none;resize:none;min-height:200px}.compose-footer{padding:1rem;border-top:1px solid var(--border-color);display:flex;justify-content:space-between;align-items:center}.send-btn{background-color:var(--brand-primary);color:#fff;padding:.5rem 1.5rem;border-radius:4px;font-weight:600;transition:background-color var(--transition-fast)}.send-btn:hover:not(:disabled){background-color:var(--brand-primary-hover)}.send-btn:disabled{opacity:.5;cursor:not-allowed}.virtual-list-inner{position:relative;width:100%}.privacy-banner{background-color:#f59e0b26;border:1px solid var(--accent-warning);color:#fbbf24;padding:.75rem 1.25rem;margin:1rem 2rem 0;border-radius:6px;display:flex;justify-content:space-between;align-items:center;font-size:.875rem}.privacy-banner button{background-color:var(--bg-surface-active);color:var(--text-primary);border:1px solid var(--border-color);padding:.25rem .75rem;border-radius:4px;font-weight:500;font-size:.8rem;transition:background-color var(--transition-fast)}.privacy-banner button:hover{background-color:var(--bg-surface-hover)}.toolbar-btn{color:var(--text-secondary);background:none;border:none;cursor:pointer;padding:.25rem;border-radius:4px;display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast)}.toolbar-btn:hover{background-color:var(--bg-surface-hover);color:var(--text-primary)}