:root{--color-bg: #fafafa;--color-surface: #ffffff;--color-border: #e4e4e7;--color-border-hover: #d4d4d8;--color-text: #18181b;--color-text-secondary: #71717a;--color-text-muted: #a1a1aa;--color-primary: #18181b;--color-primary-hover: #27272a;--color-danger: #dc2626;--color-overlay: rgba(0, 0, 0, .04);--radius-sm: 6px;--radius-md: 8px;--radius-lg: 12px;--radius-full: 9999px;--header-h: 56px;--sidebar-w: 240px;--font-xs: .75rem;--font-sm: .8125rem;--font-base: .9375rem;--font-lg: 1.125rem;--font-xl: 1.5rem;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 12px rgba(0, 0, 0, .08);--shadow-lg: 0 8px 24px rgba(0, 0, 0, .12);--transition: .15s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:var(--font-base);background:var(--color-bg);color:var(--color-text);-webkit-font-smoothing:antialiased;line-height:1.5}.page-center{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:1rem}.admin-layout{min-height:100vh;display:flex;flex-direction:column}.admin-body{flex:1;display:flex}.admin-content{flex:1;padding:2rem;min-width:0}.card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:2rem;width:100%;max-width:400px}.card-title{font-size:var(--font-lg);font-weight:600;margin-bottom:.25rem}.card-subtitle{font-size:var(--font-sm);color:var(--color-text-secondary);margin-bottom:1.5rem}.header{height:var(--header-h);border-bottom:1px solid var(--color-border);background:var(--color-surface);display:flex;align-items:center;justify-content:space-between;padding:0 1.5rem;position:sticky;top:0;z-index:100}.header-brand{font-weight:600;font-size:var(--font-base);color:var(--color-text);text-decoration:none}.header-actions{display:flex;align-items:center;gap:.25rem}.icon-btn{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border:none;border-radius:var(--radius-md);background:transparent;color:var(--color-text-secondary);cursor:pointer;transition:background var(--transition),color var(--transition);position:relative}.icon-btn:hover{background:var(--color-overlay);color:var(--color-text)}.icon-btn svg{width:20px;height:20px}.avatar{display:inline-flex;align-items:center;justify-content:center;border-radius:var(--radius-full);background:var(--color-primary);color:#fff;font-weight:600;text-transform:uppercase;flex-shrink:0}.avatar--sm{width:32px;height:32px;font-size:var(--font-xs)}.avatar--md{width:40px;height:40px;font-size:var(--font-sm)}.avatar--lg{width:64px;height:64px;font-size:var(--font-xl)}.dropdown-anchor{position:relative}.dropdown{position:absolute;top:calc(100% + 6px);right:0;min-width:200px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);box-shadow:var(--shadow-md);padding:.25rem;z-index:200;animation:dropdown-in .12s ease}@keyframes dropdown-in{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.dropdown-header{padding:.625rem .75rem;border-bottom:1px solid var(--color-border);margin-bottom:.25rem}.dropdown-header-name{font-size:var(--font-sm);font-weight:500}.dropdown-header-email{font-size:var(--font-xs);color:var(--color-text-muted)}.dropdown-item{display:flex;align-items:center;gap:.5rem;width:100%;padding:.5rem .75rem;border:none;border-radius:var(--radius-sm);background:transparent;font-size:var(--font-sm);color:var(--color-text);text-decoration:none;cursor:pointer;transition:background var(--transition);text-align:left}.dropdown-item:hover{background:var(--color-overlay)}.dropdown-item svg{width:16px;height:16px;color:var(--color-text-secondary);flex-shrink:0}.dropdown-item--danger{color:var(--color-danger)}.dropdown-item--danger svg{color:var(--color-danger)}.dropdown-separator{height:1px;background:var(--color-border);margin:.25rem 0}.form-group{margin-bottom:1rem}.form-label{display:block;font-size:var(--font-sm);font-weight:500;margin-bottom:.375rem}.form-input{width:100%;padding:.5rem .75rem;border:1px solid var(--color-border);border-radius:var(--radius-md);font-size:var(--font-base);font-family:inherit;color:var(--color-text);background:var(--color-surface);outline:none;transition:border-color var(--transition)}.form-input:focus{border-color:var(--color-primary)}.form-input::placeholder{color:var(--color-text-muted)}.form-hint{font-size:var(--font-xs);color:var(--color-text-secondary);margin-top:.25rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.5rem 1rem;border:1px solid transparent;border-radius:var(--radius-md);font-size:var(--font-sm);font-weight:500;font-family:inherit;cursor:pointer;text-decoration:none;transition:background var(--transition),border-color var(--transition),opacity var(--transition);line-height:1.5}.btn:disabled{opacity:.5;cursor:not-allowed}.btn--primary{background:var(--color-primary);color:#fff}.btn--primary:hover:not(:disabled){background:var(--color-primary-hover)}.btn--secondary{background:transparent;color:var(--color-text-secondary);border-color:var(--color-border)}.btn--secondary:hover:not(:disabled){background:var(--color-overlay);border-color:var(--color-border-hover)}.btn--ghost{background:transparent;color:var(--color-text-secondary)}.btn--ghost:hover:not(:disabled){background:var(--color-overlay);color:var(--color-text)}.btn--danger{background:var(--color-danger);color:#fff}.btn--danger:hover:not(:disabled){opacity:.9}.btn--full{width:100%}.form-error{color:var(--color-danger);font-size:var(--font-xs);margin-top:.375rem}.section{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:1.5rem}.section+.section{margin-top:1.5rem}.section-title{font-size:var(--font-base);font-weight:600;margin-bottom:1rem}.section-row{display:flex;gap:1rem}.section-row>*{flex:1}.page-title{font-size:var(--font-xl);font-weight:600;margin-bottom:1.5rem}.spinner{width:20px;height:20px;border:2px solid var(--color-border);border-top-color:var(--color-primary);border-radius:var(--radius-full);animation:spin .6s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.text-center{text-align:center}.text-secondary{color:var(--color-text-secondary)}.text-muted{color:var(--color-text-muted)}.text-sm{font-size:var(--font-sm)}.mt-1{margin-top:.5rem}.mt-2{margin-top:1rem}.mt-3{margin-top:1.5rem}.profile-header{display:flex;align-items:center;gap:1rem}.profile-name{font-weight:600;font-size:var(--font-lg)}.sidebar{border-right:1px solid var(--color-border);background:var(--color-surface);display:flex;flex-direction:column;overflow:hidden;flex-shrink:0}.sidebar-top{display:flex;align-items:center;justify-content:flex-end;padding:.75rem}.sidebar-toggle{flex-shrink:0}.sidebar-nav{display:flex;flex-direction:column;gap:.125rem;padding:0 .75rem}.sidebar-item{display:flex;align-items:center;gap:.75rem;padding:.5rem .625rem;border-radius:var(--radius-md);font-size:var(--font-sm);font-weight:500;color:var(--color-text-secondary);text-decoration:none;white-space:nowrap;overflow:hidden;transition:background var(--transition),color var(--transition)}.sidebar-item:hover,.sidebar-item--active{background:var(--color-overlay);color:var(--color-text)}.sidebar-item-icon{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:20px;height:20px}.sidebar-item-icon svg{width:18px;height:18px}.sidebar-item-label{overflow:hidden}.settings-tabs{display:flex;gap:0;border-bottom:1px solid var(--color-border);margin-bottom:1.5rem}.settings-tab{padding:.5rem 1rem;font-size:var(--font-sm);font-weight:500;color:var(--color-text-secondary);text-decoration:none;border-bottom:2px solid transparent;margin-bottom:-1px;transition:color var(--transition),border-color var(--transition)}.settings-tab:hover{color:var(--color-text)}.settings-tab--active{color:var(--color-text);border-bottom-color:var(--color-primary)}