.econ-reference-heading { margin-bottom: 23px; }
.econ-reference-heading h2 { margin: 9px 0 11px; }
.econ-reference-heading > p { margin: 0; max-width: 44rem; color: #616c7c; font-size: .9rem; line-height: 1.85; }
.econ-reference-toolbar { display: flex; align-items: flex-end; justify-content: space-between; flex-wrap: wrap; gap: 20px; padding: 20px; border: 1px solid #dce3e5; border-radius: 18px; background: #ffffffa8; }
.econ-reference-modes { display: flex; gap: 4px; padding: 4px; border-radius: 999px; background: #e9eef6; }
.econ-reference-modes button, .econ-reference-filters button { min-height: 44px; border: 0; border-radius: 999px; padding: 9px 15px; font: inherit; font-size: .74rem; background: transparent; color: #5c6e86; cursor: pointer; transition: background-color 180ms ease, color 180ms ease, box-shadow 180ms ease, transform 180ms ease; }
.econ-reference-modes button[aria-pressed="true"] { background: #fff; color: var(--accent-dark); box-shadow: 0 2px 8px #293b580a; }
.econ-reference-modes button:hover, .econ-reference-filters button:hover { color: var(--accent-dark); }
.econ-reference-search { flex: 1; min-width: min(250px, 100%); max-width: 380px; }
.econ-reference-search label { display: block; font-size: .68rem; color: #5e6a7b; margin: 0 0 7px; }
.econ-reference-search input { width: 100%; min-height: 44px; border: 1px solid #d6dee4; border-radius: 11px; background: #fff; padding: 10px 13px; color: var(--ink); font-size: .8rem; }
.econ-reference-filters { display: flex; flex-wrap: wrap; gap: 7px; margin: 21px 0; }
.econ-reference-filters button { border: 1px solid #dfe3e8; background: #ffffff80; min-width: 68px; }
.econ-reference-filters button[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: white; }
.econ-reference-filters button:active { transform: scale(.97); }
.econ-reference-summary { display: flex; align-items: baseline; gap: 20px; justify-content: space-between; margin: 25px 0 16px; }
.econ-reference-summary h3 { margin: 0; font-size: 1.12rem; font-weight: 500; letter-spacing: -.025em; }
.econ-reference-summary > span { font-size: .7rem; color: #687587; flex-shrink: 0; }
.econ-formula-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.econ-formula-card { display: flex; flex-direction: column; min-width: 0; border: 1px solid #dce2e8; border-radius: 19px; padding: 22px; background: #ffffffbd; transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease; }
.econ-formula-card:hover { border-color: #a7b6c9; box-shadow: 0 7px 22px #2b40500a; transform: translateY(-2px); }
.econ-reference-code { font-size: .65rem; color: #657790; letter-spacing: .02em; }
.econ-formula-card h4 { margin: 10px 0 14px; font-size: .98rem; line-height: 1.5; font-weight: 500; letter-spacing: -.025em; }
.econ-reference-equation { padding: 14px 15px; margin-bottom: 14px; border-radius: 12px; background: #edf1f8; color: #334f74; font-size: .84rem; line-height: 1.9; overflow-wrap: anywhere; }
.econ-formula-card > p { margin: 0 0 18px; font-size: .8rem; line-height: 1.8; color: #637083; }
.econ-formula-card > a { display: flex; align-items: center; min-height: 44px; margin-top: auto; width: fit-content; text-decoration: none; color: #3e608a; font-size: .75rem; font-weight: 500; transition: color 180ms ease, transform 180ms ease; }
.econ-formula-card > a:hover { color: #1e3c66; transform: translateX(3px); }
.econ-checklist-grid { display: grid; gap: 12px; }
.econ-checklist-item { display: grid; grid-template-columns: 39px minmax(0, 1fr); gap: 17px; padding: 20px 23px; border: 1px solid #dce3ed; border-radius: 16px; background: #ffffffb5; }
.econ-checklist-number { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 11px; background: var(--accent-soft); color: var(--accent-dark); font-size: .74rem; }
.econ-checklist-item h4 { margin: 3px 0 7px; font-size: .9rem; font-weight: 500; }
.econ-checklist-item p { margin: 0; font-size: .82rem; line-height: 1.85; color: #5b6b82; }
.econ-reference-empty { grid-column: 1/-1; padding: 48px 22px; text-align: center; border: 1px dashed #c8d2da; border-radius: 18px; }
.econ-reference-empty h4 { margin: 0 0 9px; font-size: 1rem; font-weight: 500; }
.econ-reference-empty p { color: #637184; font-size: .85rem; }
@media (max-width: 640px) {
    .econ-reference-toolbar { padding: 16px; gap: 17px; }
    .econ-reference-modes { width: 100%; }
    .econ-reference-modes button { flex: 1; padding: 8px 10px; font-size: .71rem; }
    .econ-reference-search { max-width: none; width: 100%; }
    .econ-reference-search input { font-size: 1rem; }
    .econ-reference-filters { gap: 6px; }
    .econ-reference-filters button { padding: 8px 12px; min-width: 60px; }
    .econ-formula-grid { grid-template-columns: 1fr; }
    .econ-formula-card { padding: 20px; }
    .econ-reference-summary { gap: 12px; }
    .econ-reference-summary h3 { font-size: 1rem; }
    .econ-checklist-item { padding: 18px; gap: 12px; }
}
@media (prefers-reduced-motion: reduce) {
    .econ-reference-page * { transition: none !important; animation: none !important; }
}