.usa-page { font-family: Inter, ui-sans-serif, "Segoe UI", Arial, sans-serif; background: #f4f7fb; color: #0f172a; }
.usa-page .usa-wrap { width: min(1100px, 94%); margin: 0 auto; padding: 12px 0 56px; }
.usa-crumbs { font-size: 14px; color: #64748b; margin: 8px 0 16px; }
.usa-crumbs a { color: #1d4ed8; text-decoration: none; }
.usa-hero {
    background: linear-gradient(135deg, #1e3a8a 0%, #1d4ed8 55%, #b91c1c 140%);
    color: #fff; border-radius: 20px; padding: 28px 24px; margin-bottom: 24px;
}
.usa-kicker { margin: 0 0 8px; font-size: 12px; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; color: #fde68a; }
.usa-hero h1 { margin: 0 0 10px; font-size: clamp(1.6rem, 3vw, 2.2rem); line-height: 1.2; color: #fff; }
.usa-hero p { margin: 0 0 14px; color: #dbeafe; max-width: 720px; font-size: 17px; line-height: 1.6; }
.usa-cta { display: flex; flex-wrap: wrap; gap: 8px; }
.usa-btn {
    display: inline-block; background: #fff; color: #1e3a8a; font-weight: 700;
    text-decoration: none; border-radius: 999px; padding: 9px 16px; font-size: 15px;
}
.usa-btn-ghost { background: transparent; color: #fff; border: 1px solid rgba(255,255,255,.4); }
.usa-section { margin: 28px 0; }
.usa-section h2 { font-size: 1.35rem; margin: 0 0 12px; }
.usa-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.usa-card {
    display: block; background: #fff; border: 1px solid #e2e8f0; border-radius: 14px;
    padding: 16px; text-decoration: none; color: inherit;
}
.usa-card:hover { border-color: #1d4ed8; box-shadow: 0 6px 18px rgba(30, 58, 138, .08); }
.usa-card strong { display: block; font-size: 1.05rem; margin: 4px 0; }
.usa-card p, .usa-card span { margin: 0; color: #64748b; font-size: 14px; }
.usa-ico { font-size: 1.4rem; }
.usa-quiz { background: #fff; border: 1px solid #e2e8f0; border-radius: 16px; padding: 18px; }
.usa-q { font-size: 1.2rem; font-weight: 700; margin: 12px 0; }
.usa-opts { display: grid; gap: 8px; }
.usa-opts button {
    text-align: left; border: 1px solid #cbd5e1; background: #f8fafc; border-radius: 12px;
    padding: 12px 14px; font-size: 16px; cursor: pointer; font-family: inherit;
}
.usa-opts button.is-on { border-color: #1d4ed8; background: #eff6ff; }
.usa-opts button.is-ok { border-color: #15803d; background: #dcfce7; }
.usa-opts button.is-no { border-color: #b91c1c; background: #fee2e2; }
.usa-feedback { min-height: 1.4em; color: #334155; }
.usa-bar { height: 8px; background: #e2e8f0; border-radius: 99px; overflow: hidden; }
.usa-bar span { display: block; height: 100%; width: 0; background: #1d4ed8; }
.usa-flash { background: #fff; border: 1px solid #e2e8f0; border-radius: 12px; padding: 10px 14px; margin: 8px 0; }
.usa-flash summary { cursor: pointer; font-weight: 700; }
.usa-flash p { margin: 8px 0 0; color: #15803d; }
.usa-note { font-size: 14px; color: #64748b; }
.usa-lead { margin: 0 0 12px; color: #475569; font-size: 16px; line-height: 1.5; }
.usa-pills { display: flex; flex-wrap: wrap; gap: 8px; }
.usa-pill {
    display: inline-block; background: #fff; border: 1px solid #cbd5e1; color: #1e3a8a;
    text-decoration: none; border-radius: 999px; padding: 8px 14px; font-size: 14px; font-weight: 600;
}
.usa-pill:hover { border-color: #1d4ed8; background: #eff6ff; }
.usa-grid-grades { grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (min-width: 800px) {
    .usa-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .usa-grid.usa-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .usa-grid-grades { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
}
@media (max-width: 640px) {
    .usa-grid, .usa-grid-grades { grid-template-columns: 1fr; }
    .usa-hero { padding: 20px 16px; border-radius: 16px; }
    .usa-opts button { font-size: 15px; padding: 14px 12px; min-height: 44px; }
    .usa-pill { font-size: 13px; padding: 8px 12px; }
    .usa-cta .usa-btn { flex: 1 1 auto; text-align: center; }
}