/* r32 owner: method-foundations. Exact r30 source lines 2195-2412; route scope is declared by data/css-ownership.json. */
/* Method page
   ========================================================================== */

.rules-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    border-top: 1px solid var(--line);
    border-left: 1px solid var(--line);
}

.research-rule {
    min-height: 24rem;
    padding: clamp(1.35rem, 3vw, 2.25rem);
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    background: transparent;
    transition: background 0.3s ease, transform 0.3s var(--ease);
}

.research-rule:hover {
    z-index: 2;
    background: var(--surface);
    transform: translateY(-0.25rem);
}

.research-rule > span {
    display: block;
    margin-bottom: 4rem;
    color: var(--signal);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 900;
}

.research-rule h3 {
    margin-bottom: 1rem;
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 3.2vw, 3rem);
    letter-spacing: -0.04em;
    text-transform: uppercase;
}

.research-rule p {
    color: var(--muted);
}

.section--source-layers {
    background: var(--surface);
}

.source-layers {
    display: grid;
    grid-template-columns: minmax(18rem, 0.4fr) minmax(0, 0.6fr);
    gap: clamp(3rem, 8vw, 8rem);
    align-items: start;
}

.source-layers__copy {
    position: sticky;
    top: calc(var(--header-h) + 2rem);
}

.source-layers__copy p:last-child {
    color: var(--muted);
}

.source-layers__stack {
    padding: 0;
    margin: 0;
    list-style: none;
    counter-reset: source-layers;
}

.source-layers__stack li {
    position: sticky;
    top: calc(var(--header-h) + 1rem + var(--stack, 0rem));
    min-height: 13rem;
    padding: 2rem;
    margin-bottom: 1rem;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-md);
    background:
        linear-gradient(145deg, rgba(var(--signal-rgb), 0.05), transparent 45%),
        var(--bg-soft);
    box-shadow: 0 1.5rem 3rem rgba(0, 0, 0, 0.18);
}

.source-layers__stack li:nth-child(2) { --stack: 1rem; }
.source-layers__stack li:nth-child(3) { --stack: 2rem; }
.source-layers__stack li:nth-child(4) { --stack: 3rem; }
.source-layers__stack li:nth-child(5) { --stack: 4rem; }

.source-layers__stack span {
    color: var(--signal);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 900;
}

.source-layers__stack strong {
    display: block;
    margin: 1rem 0 0.7rem;
    font-family: var(--font-display);
    font-size: clamp(1.7rem, 3vw, 2.8rem);
    letter-spacing: -0.035em;
    line-height: 1;
    text-transform: uppercase;
}

.source-layers__stack p {
    margin-bottom: 0;
    color: var(--muted);
}

.accordion {
    border-top: 1px solid var(--line);
}

.accordion__item {
    border-bottom: 1px solid var(--line);
}

.accordion__item h3 {
    margin: 0;
}

.accordion__item button {
    display: grid;
    width: 100%;
    min-height: 6.5rem;
    padding: 1.2rem 0;
    grid-template-columns: 4rem 1fr auto;
    gap: 1rem;
    align-items: center;
    color: var(--text);
    background: transparent;
    text-align: left;
    font-family: var(--font-display);
    font-size: clamp(1.7rem, 4vw, 4rem);
    letter-spacing: -0.04em;
    text-transform: uppercase;
}

.accordion__item button span {
    color: var(--signal);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0;
}

.accordion__item button i {
    display: grid;
    width: 2.8rem;
    height: 2.8rem;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: 50%;
    font-family: var(--font-body);
    font-style: normal;
    font-weight: 400;
    transition: transform 0.35s var(--ease), border-color 0.35s ease;
}

.accordion__item button[aria-expanded="true"] i {
    border-color: var(--signal);
    transform: rotate(45deg);
}

.accordion__panel {
    max-width: 62rem;
    padding: 0 5rem 2.2rem;
}

.accordion__panel p {
    margin-bottom: 0;
    color: var(--muted);
    font-size: 1.1rem;
}

.source-check {
    display: grid;
    grid-template-columns: minmax(18rem, 0.42fr) minmax(0, 0.58fr);
    gap: clamp(3rem, 8vw, 8rem);
}

.source-check__title {
    position: sticky;
    top: calc(var(--header-h) + 2rem);
    align-self: start;
}

.source-check__questions {
    border-top: 1px solid var(--line);
}

.source-check__questions article {
    display: grid;
    min-height: 8rem;
    padding: 1.4rem 0;
    grid-template-columns: 4rem 1fr;
    gap: 1rem;
    align-items: start;
    border-bottom: 1px solid var(--line);
}

.source-check__questions span {
    color: var(--signal);
    font-family: var(--font-mono);
    font-size: 0.73rem;
    font-weight: 900;
}

.source-check__questions p {
    margin-bottom: 0;
    font-size: clamp(1.1rem, 2vw, 1.5rem);
    font-weight: 700;
}