:root{--color-primary: #2563eb;--color-primary-hover: #1d4ed8;--color-bg: #f8fafc;--color-surface: #ffffff;--color-border: #e2e8f0;--color-text: #0f172a;--color-text-muted: #64748b;--color-success: #16a34a;--color-error: #dc2626;--color-warning: #d97706;--sidebar-width: 240px;--header-height: 56px;--radius: 8px;--shadow: 0 1px 3px rgba(15, 23, 42, .08);--breakpoint-md: 768px}*,*:before,*:after{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--color-bg);color:var(--color-text);line-height:1.5}a{color:var(--color-primary);text-decoration:none}a:hover{text-decoration:underline}button{font-family:inherit;cursor:pointer}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.5rem 1rem;border:1px solid transparent;border-radius:var(--radius);font-size:.875rem;font-weight:500;transition:background .15s,border-color .15s}.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:var(--color-surface);border-color:var(--color-border);color:var(--color-text)}.btn-secondary:hover:not(:disabled){background:var(--color-bg)}.card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);box-shadow:var(--shadow);padding:1.25rem}.form-group{margin-bottom:1rem}.form-group label{display:block;font-size:.875rem;font-weight:500;margin-bottom:.375rem}.form-group input,.form-group textarea,.form-group select{width:100%;padding:.5rem .75rem;border:1px solid var(--color-border);border-radius:var(--radius);font-size:.875rem}.form-group input:focus,.form-group textarea:focus,.form-group select:focus{outline:2px solid var(--color-primary);outline-offset:1px}.form-group textarea{min-height:100px;resize:vertical}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}