:root{--foreground:#1a1a1a;--background:#fafafa;--primary:#2563eb;--primary-hover:#1d4ed8;--border:#e5e7eb;--muted:#6b7280;--error:#dc2626;--success:#16a34a}*{box-sizing:border-box;padding:0;margin:0}body,html{max-width:100vw;overflow-x:hidden;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Microsoft JhengHei,sans-serif;background:var(--background);color:var(--foreground);line-height:1.6}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}button{cursor:pointer}button,input,select,textarea{font-family:inherit}.container{max-width:1200px;margin:0 auto;padding:0 1rem}.card{background:#fff;border-radius:8px;box-shadow:0 1px 3px rgba(0,0,0,.1);padding:1.5rem}.btn{display:inline-flex;align-items:center;justify-content:center;padding:.5rem 1rem;border-radius:6px;border:none;font-size:.875rem;font-weight:500;transition:background .2s}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-hover)}.btn-secondary{background:var(--border);color:var(--foreground)}.btn-secondary:hover{background:#d1d5db}.form-group{margin-bottom:1rem}.form-group label{display:block;margin-bottom:.25rem;font-size:.875rem;font-weight:500}.form-group input,.form-group select,.form-group textarea{width:100%;padding:.5rem .75rem;border:1px solid var(--border);border-radius:6px;font-size:.875rem}.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 2px rgba(37,99,235,.2)}.nav{display:flex;align-items:center;gap:1rem;padding:1rem 0;border-bottom:1px solid var(--border)}.nav a{text-decoration:none;color:var(--foreground)}.nav a:hover{color:var(--primary)}.table{width:100%;border-collapse:collapse}.table td,.table th{padding:.75rem;text-align:left;border-bottom:1px solid var(--border)}.table th{font-weight:600;background:#f9fafb}