/* =============================================================
   R&D PAGE — rd.css
   ============================================================= */

/* ---- Page hero with stats overlay ---- */
.rd-hero {
    position: relative;
    height: 80vh;
    overflow: hidden;
}

/* Dark gradient overlay for readability */
.rd-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to right, rgba(10, 20, 60, .62) 0%, rgba(10, 20, 60, .18) 65%, transparent 100%);
    z-index: 1;
    pointer-events: none;
}

.rd-hero__image {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.rd-hero__content {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 2;
    left: 0;
    right: 0;
    max-width: var(--container-max);
    margin-inline: auto;
}

.rd-hero__title {
    font-size: clamp(var(--font-size-2xl), 5vw, var(--font-size-4xl));
    font-weight: var(--font-weight-bold);
    color: var(--color-white);
    margin-top: var(--space-2);
}

/* Stats bar: pinned to the bottom of the hero, centered to container width */
.rd-hero__stats-bar {
    position: absolute;
    z-index: 2;
    bottom: 50px;
    left: 50%;
    transform: translateX(-50%);
    width: calc(var(--container-max) - var(--container-padding) * 2);
    max-width: calc(100% - var(--container-padding) * 2);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border-top: 3px solid var(--color-accent-red);
    box-shadow: var(--shadow-md);
    border-radius: var(--radius-sm);
}

.rd-hero__stats {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0;
    padding-block: var(--space-6);
}

.rd-stat {
    text-align: center;
    padding-inline: var(--space-4);
    border-right: 1px solid var(--color-gray-200);
}

.rd-stat:last-child {
    border-right: none;
}

.rd-stat__value {
    font-size: clamp(var(--font-size-xl), 3vw, var(--font-size-3xl));
    font-weight: var(--font-weight-bold);
    color: var(--color-accent-red);
    line-height: 1;
    margin-bottom: var(--space-2);
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: var(--space-1);
}

.rd-stat__value .unit {
    font-size: var(--font-size-md);
    color: var(--color-gray-700);
}

.rd-stat__label {
    font-size: var(--font-size-xs);
    color: var(--color-gray-500);
}

/* ---- Workshop Media Gallery ---- */
.workshop {
    background: var(--color-white);
    padding-block: var(--space-16);
}

.section-header {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.workshop__viewer {
    margin-top: var(--space-10);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-black);
}

/* Large preview area */
.workshop__main {
    position: relative;
    width: 100%;
    aspect-ratio: 16/7;
    background: var(--color-gray-900);
    overflow: hidden;
}

.workshop__main-media {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: opacity var(--transition-slow);
}

/* Video placeholder inside workshop viewer */
.workshop__video-wrap {
    width: 100%;
    height: 100%;
    position: relative;
}

.workshop__video-wrap video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.workshop__play-btn {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, .35);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.workshop__play-btn:hover {
    background: rgba(0, 0, 0, .2);
}

.workshop__play-icon {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: rgba(255, 255, 255, .9);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    transition: transform var(--transition-fast), background var(--transition-fast);
}

.workshop__play-btn:hover .workshop__play-icon {
    transform: scale(1.1);
    background: var(--color-white);
}

.workshop__main-label {
    position: absolute;
    bottom: 60px;
    left: var(--space-6);
    color: var(--color-white);
}

.workshop__main-tag {
    font-size: var(--font-size-xs);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, .7);
    margin-bottom: var(--space-2);
}

.workshop__main-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
}

.workshop__main-desc {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, .75);
    margin-top: var(--space-1);
}

/* Thumbnail strip */
.workshop__thumbs {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2px;
    background: var(--color-black);
}

.workshop__thumb {
    position: relative;
    aspect-ratio: 4/3;
    overflow: hidden;
    cursor: pointer;
    opacity: .6;
    transition: opacity var(--transition-fast);
}

.workshop__thumb.is-active {
    opacity: 1;
}

.workshop__thumb:hover {
    opacity: .85;
}

.workshop__thumb-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.workshop__thumb-label {
    position: absolute;
    bottom: var(--space-2);
    left: var(--space-3);
    right: var(--space-3);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-white);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ---- Quality Certifications ---- */
.quality-certs {
    background: var(--color-gray-100);
    padding-block: var(--space-16);
}

.quality-certs__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-6);
    margin-top: var(--space-12);
}

.quality-cert-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--space-7);
    border: 1px solid var(--color-gray-200);
    transition: all var(--transition-base);
}

.quality-cert-card--featured {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.quality-cert-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.quality-cert-card__icon {
    width: 48px;
    height: 48px;
    background: var(--color-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    margin-bottom: var(--space-4);
}

.quality-cert-card__name {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-bold);
    color: var(--color-gray-900);
    margin-bottom: var(--space-1);
}

.quality-cert-card__sub {
    font-size: var(--font-size-xs);
    color: var(--color-accent-green);
    font-weight: var(--font-weight-semibold);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: var(--space-4);
}

.quality-cert-card__desc {
    font-size: var(--font-size-sm);
    color: #00a676;
    line-height: var(--line-height-base);
    margin-bottom: var(--space-4);
}

.quality-cert-card__points {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.quality-cert-card__points li {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-xs);
    color: var(--color-gray-600);
}

.quality-cert-card__points li::before {
    content: '';
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #00a676;
    flex-shrink: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
    background-size: 10px;
    background-position: center;
    background-repeat: no-repeat;
}

/* ---- Responsive ---- */
@media (max-width: 1024px) {
    .rd-hero__stats {
        grid-template-columns: repeat(3, 1fr);
    }

    .quality-certs__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .rd-hero__image {
        height: 300px;
    }

    .rd-hero__stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .rd-stat {
        border-right: none;
        border-bottom: 1px solid var(--color-gray-200);
        padding-block: var(--space-4);
    }

    .workshop__thumbs {
        grid-template-columns: repeat(2, 1fr);
    }

    .workshop__main {
        aspect-ratio: 4/3;
    }
}

@media (max-width: 480px) {
    .rd-hero__stats {
        grid-template-columns: 1fr 1fr;
    }

    .quality-certs__grid {
        grid-template-columns: 1fr;
    }
}