.shell-nav { max-width: 1080px; margin: auto; padding: 12px 32px; display: flex; gap: 24px; border-bottom: 1px solid #d9e0e7; flex-wrap: wrap; }
.shell-nav a { font-size: 14px; text-decoration: none; padding: 6px 0; border-bottom: 2px solid transparent; }
.shell-nav a[aria-current="page"] { border-color: #164576; font-weight: 650; }
.shell-home { max-width: 960px; margin-top: 36px; }
.shell-home h1 { max-width: 760px; font-size: 30px; letter-spacing: -.02em; }
.shell-home .lead { font-size: 17px; }
.start-experience { margin-top: 32px; padding-top: 24px; border-top: 1px solid #c8d4df; max-width: 700px; }
.start-experience h2 { margin-top: 10px; }
.module-link { display: inline-block; padding: 12px 0; font-weight: 650; }
.access-note { font-size: 14px; color: #52677c; }
@media (max-width: 600px) { .shell-nav { padding: 10px 20px; gap: 16px; } .shell-home h1 { font-size: 28px; } }
@media print { .shell-nav { display: none; } }
.login { max-width: 640px; }
.login form { max-width: 420px; display: block; margin-top: 20px; }
.login p { margin: 12px 0; }
.login button:hover { color: white; }
.login input:focus-visible { outline: 3px solid #cd835f; outline-offset: 3px; }
.shell-nav a { color: #164576; }
.skip-link { position: absolute; left: 16px; top: -100px; padding: 12px; background: white; z-index: 2; }
.skip-link:focus { top: 12px; }
.login label { display: block; margin: 18px 0 6px; }
.login input { box-sizing: border-box; width: 100%; padding: 12px; border: 1px solid #b8c6d2; border-radius: 6px; font: inherit; }
.login button { padding: 12px 16px; margin-top: 16px; cursor: pointer; font: inherit; color: #174a70; background: #fff; border: 1px solid #b8c6d2; border-radius: 6px; }
.login button:disabled { opacity: .6; cursor: wait; }
[hidden] { display: none !important; }
.amrigs section { margin: 24px 0; padding-top: 16px; border-top: 1px solid #d9e0e7; }
.amrigs form label { display: block; margin: 12px 0; }
.amrigs select { font: inherit; margin-left: 8px; padding: 7px; }
.amrigs fieldset { border: 0; padding: 0; }
.amrigs fieldset label { padding: 12px; border: 1px solid #d9e0e7; border-radius: 6px; }
.amrigs fieldset small { display: block; margin: 8px 0 0 28px; color: #41576d; }
.amrigs button { margin: 10px 12px 10px 0; padding: 10px 16px; cursor: pointer; }
.amrigs button:disabled { opacity: .45; cursor: not-allowed; }
.amrigs img { max-width: 100%; height: auto; }
.amrigs figure { margin: 18px 0; }
.amrigs #amrigs-feedback { padding: 12px 18px; background: #eef4fa; }
.activities { display: grid; gap: 10px; margin: 18px 0 8px; max-width: 520px; }
.activities .activity { display: block; padding: 14px 16px; border: 1px solid #c8d4df; border-radius: 12px; text-decoration: none; background: #fff; }
.activities .activity strong { display: block; color: #164576; font-size: 16px; }
.activities .activity span { display: block; color: #52677c; font-size: 14px; margin-top: 3px; }
.activities .activity:hover, .activities .activity:focus-visible { border-color: #164576; }
.amrigs input[type=search] { font: inherit; margin-left: 8px; padding: 7px; width: min(320px, 100%); box-sizing: border-box; }
.amrigs-catalog-item { border: 1px solid #d9e0e7; border-radius: 8px; padding: 10px 14px; margin: 10px 0; background: #fff; }
.amrigs-catalog-item summary { cursor: pointer; font-weight: 600; color: #164576; }
.amrigs-catalog-item .alt { margin: 8px 0; padding: 8px 10px; border-radius: 6px; background: #f5f7fa; }
.amrigs-catalog-item .alt.correta { background: #e7f5ee; border-left: 4px solid #1f8a5b; }
.amrigs-catalog-item .alt small { display: block; color: #41576d; margin-top: 4px; }
.amrigs-catalog-item .perola { font-style: italic; color: #41576d; }