.sa-section {
    position: relative;
    padding: 7rem 1.5rem;
    background: transparent;
}

.sa-head {
    max-width: 720px;
    margin: 0 auto 4rem;
    text-align: center;
}

.sa-head .v2-h2 {
    margin: 0 auto;
}

.sa-head .v2-sub {
    margin: 0.9rem auto 0;
    max-width: 560px;
}

.sa-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 4rem;
    align-items: center;
    max-width: 1080px;
    margin: 0 auto;
}

.sa-accordion {
    display: flex;
    flex-direction: column;
}

.sa-item {
    border-bottom: 1px solid var(--v2-line);
}

.sa-item:first-child {
    border-top: 1px solid var(--v2-line);
}

.sa-item-btn {
    position: relative;
    display: flex;
    align-items: center;
    gap: 1.25rem;
    width: 100%;
    padding: 1.4rem 0.5rem;
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    font-family: inherit;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.sa-progress {
    position: absolute;
    left: 0;
    bottom: -1px;
    height: 1px;
    width: 0;
    background: var(--layer-color);
    pointer-events: none;
}

.sa-item.is-active .sa-progress {
    animation: saProgress 4s linear forwards;
}

@keyframes saProgress {
    from { width: 0; }
    to { width: 100%; }
}

.sa-num {
    font-family: 'Saira', 'Hanken Grotesk', 'Inter', sans-serif;
    font-size: 0.95rem;
    font-weight: 400;
    letter-spacing: 0.02em;
    color: var(--v2-txt-3);
    min-width: 2.5rem;
    flex-shrink: 0;
    transition: color 0.25s ease;
}

.sa-title {
    font-family: 'Hanken Grotesk', 'Inter', sans-serif;
    font-size: 1.5rem;
    font-weight: 500;
    letter-spacing: -0.02em;
    color: var(--v2-txt-2);
    flex: 1 1 auto;
    min-width: 0;
    transition: color 0.25s ease;
}

.sa-indicator {
    margin-left: auto;
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background: transparent;
    border: 1px solid var(--v2-line-strong);
    flex-shrink: 0;
    transition: background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

@media (hover: hover) {
    .sa-item-btn:hover .sa-title {
        color: var(--v2-txt-1);
    }
}

.sa-item.is-active .sa-num {
    color: var(--layer-color);
}

.sa-item.is-active .sa-title {
    color: var(--v2-txt-1);
}

.sa-item.is-active .sa-indicator {
    background: var(--layer-color);
    border-color: var(--layer-color);
    box-shadow: 0 0 12px var(--layer-color);
}

.sa-item-panel {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.sa-item.is-active .sa-item-panel {
    grid-template-rows: 1fr;
}

.sa-item-panel-inner {
    overflow: hidden;
    min-height: 0;
}

.sa-desc {
    margin: 0;
    max-width: 460px;
    padding: 0 0.5rem 1rem 3.75rem;
    font-size: 1rem;
    line-height: 1.7;
    color: var(--v2-txt-2);
}

.sa-pill {
    display: inline-flex;
    margin: 0 0 1.4rem 3.75rem;
    padding: 0.35rem 0.85rem;
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    color: var(--layer-color);
    background: rgba(255, 255, 255, 0.04);
    background: color-mix(in srgb, var(--layer-color) 12%, transparent);
    border: 1px solid var(--layer-color);
    border: 1px solid color-mix(in srgb, var(--layer-color) 30%, transparent);
    border-radius: 999px;
}

.sa-visual {
    position: relative;
    width: 100%;
    max-width: 440px;
    margin: 0 auto;
    aspect-ratio: 518 / 718;
    overflow: hidden;
}

@supports not (aspect-ratio: 1) {
    .sa-visual {
        height: 0;
        padding-bottom: 138.6%;
    }
}

.sa-layer {
    position: absolute;
    inset: 0;
    object-fit: contain;
    opacity: 0;
    transform: translateY(28px) scale(0.96);
    transition: opacity 0.5s ease, transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.sa-layer.is-active {
    opacity: 1;
    transform: translateY(0) scale(1);
}

@media (max-width: 900px) {
    .sa-section {
        padding: 4.5rem 1rem;
    }

    .sa-layout {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .sa-visual {
        max-width: 360px;
    }

    .sa-head {
        margin-bottom: 3rem;
    }
}

@media (max-width: 480px) {
    .sa-section {
        padding: 3.5rem 1rem;
    }

    .sa-head {
        margin-bottom: 2.25rem;
    }

    .sa-item-btn {
        gap: 0.75rem;
        padding: 1.1rem 0.25rem;
    }

    .sa-num {
        min-width: 2rem;
        font-size: 0.85rem;
    }

    .sa-title {
        font-size: 1.15rem;
    }

    .sa-desc {
        padding: 0 0.25rem 0.85rem 2.75rem;
        font-size: 0.95rem;
    }

    .sa-pill {
        margin: 0 0 1.2rem 2.75rem;
    }

    .sa-visual {
        max-width: 300px;
    }
}