:root{--primary-50:#e6f4f4;--primary-100:#c7e6e7;--primary-500:#0f8a8d;--primary-600:#0b6e70;--primary-700:#085457;--ink-blue:#1b3a5b;--accent-500:#f26b5b;--accent-600:#e0533f;--success:#2fa36b;--warning:#e8a13a;--error:#d64545;--info:#0f8a8d;--ink:#1a2630;--grey-700:#475663;--grey-400:#97a4ae;--grey-200:#e2e8ed;--surface:#f6f9fa;--white:#ffffff;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--shadow-sm:0 1px 3px rgba(27,58,91,0.08);--shadow-md:0 4px 12px rgba(27,58,91,0.12);--header-h:56px;--bottomnav-h:60px;--content-max:720px;--font:-apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,sans-serif}*,:after,:before{box-sizing:border-box;margin:0;padding:0}html{font-size:16px}body{font-family:var(--font);background:var(--surface);color:var(--ink);line-height:1.5;-webkit-font-smoothing:antialiased}a{color:var(--primary-600);text-decoration:none}a:hover{text-decoration:underline}button{font-family:inherit;cursor:pointer;border:none;outline:none;font-size:1rem}:focus-visible{outline:2px solid var(--primary-600);outline-offset:2px}h1,h2,h3{color:var(--ink-blue);line-height:1.25}input,select,textarea{font-family:inherit;font-size:1rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;min-height:44px;padding:.625rem 1.25rem;border-radius:var(--radius-md);font-weight:600;transition:background-color .15s ease,opacity .15s ease}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-primary{background:var(--primary-600);color:var(--white)}.btn-primary:hover:not(:disabled){background:var(--primary-700)}.btn-accent{background:var(--accent-500);color:var(--white)}.btn-accent:hover:not(:disabled){background:var(--accent-600)}.btn-ghost{background:transparent;color:var(--primary-600);border:1px solid var(--grey-200)}.btn-ghost:hover:not(:disabled){background:var(--primary-50)}.btn-danger{background:transparent;color:var(--error);border:1px solid var(--grey-200)}.btn-danger:hover:not(:disabled){background:#fbeaea}.card{background:var(--white);border:1px solid var(--grey-200);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm)}.field-label{display:block;font-size:.875rem;font-weight:600;color:var(--grey-700);margin-bottom:.375rem}.field-input{width:100%;min-height:44px;padding:.625rem .75rem;border:1px solid var(--grey-200);border-radius:var(--radius-md);background:var(--white);color:var(--ink)}.field-input:focus{border-color:var(--primary-500)}.field-input[aria-invalid=true]{border-color:var(--error)}.field-error{color:var(--error);font-size:.8125rem;margin-top:.25rem}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media print{@page{size:A4;margin:14mm}body *{visibility:hidden}#exercise-print,#exercise-print *{visibility:visible}#exercise-print{position:absolute;left:0;top:0;width:100%;max-width:none}.no-print{display:none!important}*{-webkit-print-color-adjust:exact;print-color-adjust:exact}}