:root{--vx-primary: #667eea;--vx-primary-strong: #5566d6;--vx-secondary: #764ba2;--vx-accent: #49c170;--vx-gradient: linear-gradient(135deg, var(--vx-primary) 0%, var(--vx-secondary) 100%);--vx-bg: #f4f5fa;--vx-surface: #ffffff;--vx-surface-muted: #f8f9fb;--vx-border: #e1e5e9;--vx-border-strong: #cbd2dc;--vx-text: #1f2430;--vx-text-secondary: #5b6472;--vx-text-muted: #8a93a3;--vx-on-primary: #ffffff;--vx-info: #2563eb;--vx-info-bg: #eef3ff;--vx-warn: #b7791f;--vx-warn-bg: #fdf6e7;--vx-error: #c0392b;--vx-error-bg: #fdecea;--vx-success: #1f8a4c;--vx-success-bg: #e9f7ef;--vx-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;--vx-font-base: 16px;--vx-line-height: 1.55;--vx-sp-xs: 6px;--vx-sp-sm: 10px;--vx-sp-md: 16px;--vx-sp-lg: 24px;--vx-sp-xl: 36px;--vx-radius: 12px;--vx-radius-sm: 8px;--vx-shadow: 0 8px 30px rgba(31, 36, 48, .08);--vx-shadow-sm: 0 2px 8px rgba(31, 36, 48, .06)}*,*:before,*:after{box-sizing:border-box}html,body{margin:0;padding:0}body{font-family:var(--vx-font);font-size:var(--vx-font-base);line-height:var(--vx-line-height);color:var(--vx-text);background:var(--vx-bg);-webkit-font-smoothing:antialiased}#app{min-height:100vh;display:flex;flex-direction:column}.vx-header{background:var(--vx-gradient);color:var(--vx-on-primary);padding:var(--vx-sp-md) var(--vx-sp-lg);display:flex;align-items:center;justify-content:space-between;gap:var(--vx-sp-md);box-shadow:var(--vx-shadow-sm)}.vx-brand{display:flex;align-items:center;gap:var(--vx-sp-sm);font-weight:700;letter-spacing:.3px}.vx-brand__logo{width:34px;height:34px;border-radius:9px;background:#ffffff2e;display:grid;place-items:center;font-weight:800;font-size:18px}.vx-brand__title{font-size:18px;line-height:1.1}.vx-brand__subtitle{font-size:12.5px;font-weight:500;opacity:.85}.vx-header__right{display:flex;align-items:center;gap:var(--vx-sp-md);font-size:14px}.vx-userchip{display:flex;align-items:center;gap:8px;background:#ffffff29;padding:6px 12px;border-radius:999px;font-weight:600}.vx-userchip__role{font-size:11px;text-transform:uppercase;letter-spacing:.5px;background:#ffffff38;padding:2px 7px;border-radius:999px}.vx-tabs{display:flex;gap:4px;padding:0 var(--vx-sp-lg);background:var(--vx-surface);border-bottom:1px solid var(--vx-border);position:sticky;top:0;z-index:5}.vx-tab{appearance:none;border:none;background:none;font:inherit;font-weight:600;color:var(--vx-text-secondary);padding:14px 18px;cursor:pointer;border-bottom:3px solid transparent;margin-bottom:-1px}.vx-tab:hover{color:var(--vx-text)}.vx-tab--active{color:var(--vx-primary);border-bottom-color:var(--vx-primary)}.vx-main{flex:1;width:100%;max-width:1080px;margin:0 auto;padding:var(--vx-sp-lg)}.vx-grid{display:grid;grid-template-columns:380px 1fr;gap:var(--vx-sp-lg);align-items:start}@media (max-width: 880px){.vx-grid{grid-template-columns:1fr}}.vx-card{background:var(--vx-surface);border:1px solid var(--vx-border);border-radius:var(--vx-radius);box-shadow:var(--vx-shadow-sm);padding:var(--vx-sp-lg)}.vx-card__title{margin:0 0 var(--vx-sp-md);font-size:17px;font-weight:700;color:var(--vx-text)}.vx-card__hint{margin:-6px 0 var(--vx-sp-md);font-size:13px;color:var(--vx-text-muted)}.vx-field{margin-bottom:var(--vx-sp-md)}.vx-label{display:block;font-size:13px;font-weight:600;color:var(--vx-text-secondary);margin-bottom:6px}.vx-select,.vx-input{width:100%;font:inherit;font-size:15px;color:var(--vx-text);background:var(--vx-surface);border:1px solid var(--vx-border-strong);border-radius:var(--vx-radius-sm);padding:10px 12px}.vx-select:focus,.vx-input:focus{outline:none;border-color:var(--vx-primary);box-shadow:0 0 0 3px #667eea2e}.vx-input--num{width:84px}.vx-btn{appearance:none;font:inherit;font-weight:600;border-radius:var(--vx-radius-sm);padding:11px 18px;cursor:pointer;border:1px solid transparent;transition:filter .15s ease,opacity .15s ease;display:inline-flex;align-items:center;justify-content:center;gap:8px}.vx-btn:disabled{opacity:.55;cursor:not-allowed}.vx-btn--primary{background:var(--vx-gradient);color:var(--vx-on-primary)}.vx-btn--primary:not(:disabled):hover{filter:brightness(1.05)}.vx-btn--secondary{background:var(--vx-surface);color:var(--vx-primary);border-color:var(--vx-border-strong)}.vx-btn--secondary:not(:disabled):hover{border-color:var(--vx-primary)}.vx-btn--ghost{background:transparent;color:var(--vx-text-secondary);border-color:transparent}.vx-btn--ghost:not(:disabled):hover{background:var(--vx-surface-muted);color:var(--vx-text)}.vx-btn--block{width:100%}.vx-btn-row{display:flex;flex-wrap:wrap;gap:var(--vx-sp-sm)}.vx-spinner{width:18px;height:18px;border:2.5px solid rgba(255,255,255,.4);border-top-color:#fff;border-radius:50%;animation:vx-spin .7s linear infinite;display:inline-block}.vx-spinner--dark{border-color:#667eea40;border-top-color:var(--vx-primary)}@keyframes vx-spin{to{transform:rotate(360deg)}}.vx-loading{display:flex;align-items:center;gap:var(--vx-sp-sm);color:var(--vx-text-secondary);font-size:14px;padding:var(--vx-sp-md) 0}.vx-notice{border-radius:var(--vx-radius-sm);padding:12px 14px;font-size:14px;border:1px solid transparent;margin:var(--vx-sp-sm) 0}.vx-notice--info{background:var(--vx-info-bg);border-color:#cfe0ff;color:var(--vx-info)}.vx-notice--warn{background:var(--vx-warn-bg);border-color:#f3e3bf;color:var(--vx-warn)}.vx-notice--error{background:var(--vx-error-bg);border-color:#f5c6c0;color:var(--vx-error)}.vx-notice--success{background:var(--vx-success-bg);border-color:#bfe6cf;color:var(--vx-success)}.vx-preview{min-height:320px;border:1px dashed var(--vx-border-strong);border-radius:var(--vx-radius-sm);background:#fff;display:grid;place-items:center;padding:var(--vx-sp-lg);overflow:auto}.vx-preview svg{max-width:100%;height:auto}.vx-preview__empty{color:var(--vx-text-muted);text-align:center;font-size:14px}.vx-solution{margin-top:var(--vx-sp-md);padding:var(--vx-sp-md);background:var(--vx-surface-muted);border:1px solid var(--vx-border);border-radius:var(--vx-radius-sm)}.vx-solution__letter{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:8px;background:var(--vx-accent);color:#fff;font-weight:800;font-size:18px}.vx-meta{font-size:12.5px;color:var(--vx-text-muted);margin-top:var(--vx-sp-sm)}pre.vx-trace{white-space:pre-wrap;word-break:break-word;font-family:Consolas,Monaco,monospace;font-size:12px;background:#0f1320;color:#e6e8ef;padding:var(--vx-sp-md);border-radius:var(--vx-radius-sm);max-height:260px;overflow:auto;margin-top:var(--vx-sp-sm)}.vx-group{display:grid;grid-template-columns:90px 1fr 1fr auto;gap:var(--vx-sp-sm);align-items:end;padding:var(--vx-sp-md);border:1px solid var(--vx-border);border-radius:var(--vx-radius-sm);margin-bottom:var(--vx-sp-sm);background:var(--vx-surface-muted)}@media (max-width: 620px){.vx-group{grid-template-columns:1fr 1fr}}.vx-group__remove{appearance:none;border:1px solid var(--vx-border-strong);background:#fff;color:var(--vx-error);border-radius:var(--vx-radius-sm);width:40px;height:40px;font-size:18px;cursor:pointer;line-height:1}.vx-group__remove:hover{border-color:var(--vx-error)}.vx-examen-summary{font-size:13px;color:var(--vx-text-secondary);margin:var(--vx-sp-sm) 0 var(--vx-sp-md)}.vx-login-screen{flex:1;display:grid;place-items:center;background:var(--vx-gradient);padding:var(--vx-sp-lg)}.vx-login-overlay{position:fixed;inset:0;background:#1f24308c;backdrop-filter:blur(2px);display:grid;place-items:center;z-index:50;padding:var(--vx-sp-lg)}.vx-login-card{background:var(--vx-surface);border-radius:var(--vx-radius);box-shadow:var(--vx-shadow);padding:var(--vx-sp-xl);width:100%;max-width:400px;text-align:center}.vx-login-card__logo{width:56px;height:56px;border-radius:14px;background:var(--vx-gradient);color:#fff;display:grid;place-items:center;font-weight:800;font-size:26px;margin:0 auto var(--vx-sp-md)}.vx-login-card h1{font-size:20px;margin:0 0 6px}.vx-login-card p{color:var(--vx-text-secondary);font-size:14px;margin:0 0 var(--vx-sp-lg)}.vx-login-card .vx-field{text-align:left}.vx-footer{text-align:center;font-size:12px;color:var(--vx-text-muted);padding:var(--vx-sp-md)}.vx-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}