/* ==========================================================
   RVIOTECH — PRODUCT DETAIL PAGE
   RS485 → Wi-Fi Converter
========================================================== */

.product-breadcrumb {
    padding-top: 100px;
    padding-bottom: 18px;
    background: var(--rv-bg);
    color: var(--rv-text-muted);
    font-size: 12px;
}

.product-breadcrumb .rv-container {
    display: flex;
    align-items: center;
    gap: 10px;
}

.product-breadcrumb a:hover {
    color: var(--rv-accent);
}

.product-detail-hero {
    position: relative;
    overflow: hidden;
    padding: 35px 0 85px;
    background:
        radial-gradient(circle at 18% 50%, rgba(54,224,160,.10), transparent 35%),
        linear-gradient(135deg, #03100d, #020706);
}

.product-hero-grid {
    min-height: 560px;
    display: grid;
    grid-template-columns: .9fr 1.1fr;
    align-items: center;
    gap: 70px;
}

.product-image-wrap {
    text-align: center;
}

.product-image {
    width: min(100%, 520px);
    margin-inline: auto;
    object-fit: contain;
    filter: drop-shadow(0 25px 45px rgba(0,0,0,.45));
}

.concept-note {
    margin-top: 12px;
    color: var(--rv-text-muted);
    font-size: 11px;
}

.product-hero-copy {
    max-width: 680px;
}

.product-hero-copy h1 {
    font-size: clamp(48px, 6vw, 78px);
    line-height: .98;
    margin-bottom: 26px;
}

.product-hero-copy > p {
    max-width: 650px;
    color: var(--rv-text-secondary);
    font-size: 18px;
    line-height: 1.75;
    margin-bottom: 34px;
}

.product-hero-copy .rv-btn span {
    font-size: 18px;
}

.product-light-section {
    padding: 95px 0;
    background: #eef3f2;
    color: #071511;
}

.connection-section {
    display: grid;
    grid-template-columns: .78fr 1.22fr;
    align-items: center;
    gap: 65px;
}

.product-light-section .rv-eyebrow {
    color: #087f70;
}

.connection-copy h2,
.documentation-grid h2 {
    font-size: clamp(34px, 4vw, 55px);
    line-height: 1.05;
    margin-bottom: 22px;
}

.connection-copy .rv-text {
    color: #52625f;
    max-width: 520px;
}

.connection-diagram {
    display: grid;
    grid-template-columns: 1fr auto 150px auto 1fr;
    align-items: center;
    gap: 14px;
}

.system-box {
    background: #fff;
    border: 1px solid #d5dfdc;
    border-radius: 12px;
    padding: 16px 14px;
    box-shadow: 0 15px 40px rgba(4, 30, 24, .08);
}

.system-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 2px;
    color: #243632;
    font-size: 12px;
    font-weight: 600;
}

.system-item span {
    width: 27px;
    height: 27px;
    display: grid;
    place-items: center;
    border: 1px solid #b9cfca;
    border-radius: 6px;
    color: #087f70;
}

.system-box small {
    display: block;
    text-align: center;
    margin-top: 8px;
    color: #71817e;
    font-size: 10px;
}

.connection-arrow {
    text-align: center;
    color: #087f70;
}

.connection-arrow strong {
    display: block;
    font-size: 24px;
    line-height: 1;
}

.connection-arrow small {
    font-size: 9px;
    font-weight: 700;
}

.mini-device {
    min-height: 105px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    background: #dfe8e5;
    border: 1px solid #c1cfcb;
    border-radius: 10px;
    box-shadow: 0 12px 30px rgba(0,0,0,.12);
}

.mini-device strong {
    font-size: 13px;
}

.mini-device span {
    color: #52625f;
    font-size: 9px;
}

.product-dark-section {
    padding: 95px 0;
    background:
        radial-gradient(circle at 80% 40%, rgba(54,224,160,.07), transparent 32%),
        var(--rv-bg);
}

.problem-grid {
    display: grid;
    grid-template-columns: 1.05fr .95fr;
    gap: 80px;
}

.product-dark-section h2 {
    font-size: clamp(34px, 4vw, 55px);
    line-height: 1.05;
    margin-bottom: 25px;
}

.product-dark-section .rv-text {
    max-width: 680px;
}

.feature-panel {
    border-left: 1px solid rgba(54,224,160,.25);
    padding-left: 40px;
}

.feature-panel ul,
.advantage-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.feature-panel li {
    position: relative;
    padding-left: 34px;
    margin: 17px 0;
    color: var(--rv-text-secondary);
    font-size: 15px;
}

.feature-panel li::before,
.advantage-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    top: 0;
    width: 21px;
    height: 21px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: #087f70;
    color: #fff;
    font-size: 11px;
    font-weight: 700;
}

.two-column-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
}

.application-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 25px 30px;
}

.application-grid div {
    display: flex;
    align-items: center;
    gap: 12px;
    color: #263934;
    font-weight: 600;
}

.application-grid span {
    width: 35px;
    height: 35px;
    display: grid;
    place-items: center;
    color: #087f70;
    border: 1px solid #bfd0cc;
    border-radius: 8px;
}

.advantage-list li {
    position: relative;
    padding-left: 34px;
    margin: 16px 0;
    color: #40534e;
}

.product-documentation {
    padding: 95px 0;
    background:
        radial-gradient(circle at 50% 100%, rgba(54,224,160,.10), transparent 40%),
        #04120f;
}

.documentation-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 70px;
}

.product-documentation h2 {
    color: var(--rv-text);
}

.product-documentation p {
    max-width: 540px;
    color: var(--rv-text-secondary);
    line-height: 1.75;
    margin-bottom: 28px;
}

.documentation-cta {
    border-left: 1px solid rgba(54,224,160,.25);
    padding-left: 50px;
}

@media (max-width: 1050px) {
    .product-hero-grid,
    .connection-section,
    .problem-grid,
    .two-column-section,
    .documentation-grid {
        grid-template-columns: 1fr;
    }

    .product-hero-grid {
        gap: 35px;
    }

    .connection-diagram {
        grid-template-columns: 1fr;
    }

    .connection-arrow strong {
        transform: rotate(90deg);
    }

    .feature-panel,
    .documentation-cta {
        border-left: 0;
        border-top: 1px solid rgba(54,224,160,.25);
        padding-left: 0;
        padding-top: 35px;
    }
}

@media (max-width: 600px) {
    .product-breadcrumb {
        padding-top: 92px;
    }

    .product-detail-hero,
    .product-light-section,
    .product-dark-section,
    .product-documentation {
        padding-top: 65px;
        padding-bottom: 65px;
    }

    .product-hero-copy h1 {
        font-size: 44px;
    }

    .application-grid {
        grid-template-columns: 1fr;
    }
}