/* ============================================================
   PLATFORM ARCHITECTURE PAGE
   ============================================================ */

/* ============================================================
   HERO
   ============================================================ */

.arch-hero {
    padding-block: var(--section-py-mobile);
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
}

@media (min-width: 1024px) {
    .arch-hero { padding-block: var(--section-py); }
}

.arch-hero__heading {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.1;
    color: var(--color-navy);
    margin-bottom: 1rem;
}

@media (min-width: 640px)  { .arch-hero__heading { font-size: 2.5rem; } }
@media (min-width: 1024px) { .arch-hero__heading { font-size: 3rem; } }

.arch-hero__subhead {
    font-size: 1rem;
    color: var(--color-text-sec);
    line-height: 1.7;
    max-width: 680px;
    margin: 0;
}

/* ============================================================
   MAIN VISUAL — two-column layout
   ============================================================ */

.arch-main {
    padding-block: var(--section-py-mobile);
    background-color: var(--color-light-bg);
    border-bottom: 1px solid var(--color-border);
}

@media (min-width: 1024px) {
    .arch-main { padding-block: var(--section-py); }
}

.arch-visual-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    align-items: center;
}

@media (min-width: 768px) {
    .arch-visual-layout {
        grid-template-columns: 320px 1fr;
        gap: 4rem;
    }
}

@media (min-width: 1024px) {
    .arch-visual-layout {
        grid-template-columns: 360px 1fr;
        gap: 5rem;
    }
}

/* Stack column */
.arch-stack-col {
    display: flex;
    align-items: center;
    justify-content: center;
}

.arch-stack-svg {
    width: 100%;
    max-width: 320px;
    height: auto;
    display: block;
    filter: drop-shadow(0 8px 28px rgba(13, 27, 53, 0.13));
}

@media (min-width: 768px) {
    .arch-stack-svg { max-width: 100%; }
}

/* ============================================================
   LAYER ROWS — right column
   ============================================================ */

.arch-layers-col {
    display: flex;
    flex-direction: column;
}

.arch-lrow {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.25rem 0 1.25rem 1rem;
    border-bottom: 1px solid var(--color-border);
    border-left: 3px solid transparent;
    transition: border-left-color 0.15s;
}

.arch-lrow:first-child {
    border-top: 1px solid var(--color-border);
}

.arch-lrow--blue {
    border-left-color: #4886AF;
}

.arch-lrow--gold {
    border-left-color: #D4A820;
    background-color: rgba(245, 158, 11, 0.04);
}

.arch-lrow__icon {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 0.1rem;
}

.arch-lrow--blue .arch-lrow__icon {
    background-color: rgba(0, 87, 184, 0.08);
    color: var(--color-interactive);
}

.arch-lrow--gold .arch-lrow__icon {
    background-color: rgba(245, 158, 11, 0.14);
    color: #B87C00;
}

.arch-lrow__body {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.arch-lrow__title {
    display: block;
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--color-navy);
    line-height: 1.3;
}

.arch-lrow--gold .arch-lrow__title {
    color: #8B5E00;
}

.arch-lrow__desc {
    font-size: 0.8125rem;
    color: var(--color-text-sec);
    line-height: 1.65;
    margin: 0;
}

/* ============================================================
   PLATFORM PROPERTIES (BOTTOM FEATURE ROW)
   ============================================================ */

.arch-features {
    background-color: var(--color-white);
    padding-block: 3rem;
    border-top: 1px solid var(--color-border);
}

.arch-features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.75rem 2rem;
}

@media (min-width: 768px) {
    .arch-features-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 1.5rem;
    }
}

.arch-feature {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    gap: 0.875rem;
}

.arch-feature__icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border-radius: var(--radius);
    background-color: rgba(0, 87, 184, 0.07);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-interactive);
    margin-top: 0.1rem;
}

.arch-feature__text {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.arch-feature__title {
    display: block;
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--color-navy);
    line-height: 1.3;
}

.arch-feature__desc {
    display: block;
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    margin: 0;
}