:root{--color-bg: #f8f9fb;--color-surface: #ffffff;--color-primary: #2d5dd0;--color-primary-dark: #1f4094;--color-text: #182033;--color-border: #d6d9e2;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--color-bg);color:var(--color-text)}button{font:inherit}.btn{border:none;border-radius:6px;padding:.45rem 1.25rem;font-weight:600;cursor:pointer;transition:background .2s ease,color .2s ease,border-color .2s ease}.btn:disabled{cursor:not-allowed;opacity:.55}.btn:disabled.btn-secondary{border-color:#2d5dd066;color:#2d5dd099}.btn-primary{background:var(--color-primary);color:#fff}.btn-primary:hover,.btn-primary:focus-visible{background:var(--color-primary-dark)}.btn-secondary{background:transparent;color:var(--color-primary);border:1px solid var(--color-primary)}.btn-secondary.active{background:var(--color-primary);color:#fff}.card{background:var(--color-surface);border-radius:12px;border:1px solid var(--color-border);padding:1.25rem;box-shadow:0 6px 22px #18203312}.stack{display:flex;flex-direction:column;gap:1rem}