/* =============================================
   GRADES.CSS — "OUR GRADES" Section
   Industrial-Luxury · Dark · Image Overlay Cards
   ============================================= */

/* ══════════════════════════════════════════════
   SECTION WRAPPER
   ══════════════════════════════════════════════ */
.grades-section {
    position: relative;
    padding: 56px 0 64px;
    background: var(--bg-primary);            /* fallback solid color */
    overflow: hidden;
    background-image: url('../images/grades-bg.png');
    background-size: cover;
    background-position: center;
}

/* ── Overlay layer (black transparent) — above image, below grid ── */
.grades-section::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);          /* 0.5 = 50% opacity – adjust as needed */
    z-index: 0;
    pointer-events: none;
}

/* Subtle engineering grid — above overlay, below content */
.grades-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(245, 184, 0, 0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(245, 184, 0, 0.025) 1px, transparent 1px);
    background-size: 64px 64px;
    -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 80%);
            mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 80%);
    z-index: 1;                                /* above overlay */
    pointer-events: none;
}

/* Container (text + cards) — above everything */
.grades-section .container {
    position: relative;
    z-index: 2;
}

/* ══════════════════════════════════════════════
   SECTION HEADER  (matches .products-hdr)
   ══════════════════════════════════════════════ */
.grades-hdr {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 28px;
}

.grades-hdr__label {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    color: var(--accent);
    text-transform: uppercase;
}

.grades-hdr__line {
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg,
        var(--accent-border) 0%,
        transparent 100%);
}

/* ══════════════════════════════════════════════
   GRADES GRID  — 6 cols desktop / 3 tablet / 2 mobile
   ══════════════════════════════════════════════ */
.grades-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 16px;
}

/* ══════════════════════════════════════════════
   GRADE CARD  (.drp-grade-card)
   Full-bleed image + bottom dark gradient overlay
   ══════════════════════════════════════════════ */
.drp-grade-card {
    position: relative;
    display: block;
    min-height: 400px;
    background: var(--bg-panel);
    border: 1px solid var(--border-subtle);
    border-radius: 14px;              /* ★ rounded corners */
    overflow: hidden;                 /* clips zoom + radius */
    text-decoration: none;
    isolation: isolate;
    transition:
        border-color  var(--t-fast),
        transform     var(--t-fast),
        box-shadow    var(--t-fast);
}

/* ★ Hover: thin yellow border + lift */
.drp-grade-card:hover,
.drp-grade-card:focus-visible {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow:
        0 14px 38px rgba(0, 0, 0, 0.45),
        0 0 0 1px rgba(245, 184, 0, 0.20);
}

/* ── Media layer (covers entire card) ── */
.drp-grade-card__media {
    position: absolute;
    inset: 0;
    overflow: hidden;
    border-radius: 14px;              /* ★ match card radius */
}

.drp-grade-card__img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    /* ★ Zoom effect on hover */
    transform: scale(1);
    transition: transform var(--t-slow);
    will-change: transform;
}

.drp-grade-card:hover .drp-grade-card__img,
.drp-grade-card:focus-visible .drp-grade-card__img {
    transform: scale(1.05);
}

/* ★ Black gradient — bottom → top (text sits here) */
.drp-grade-card__media::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        0deg,
        rgba(9, 12, 19, 0.96) 0%,
        rgba(9, 12, 19, 0.85) 28%,
        rgba(9, 12, 19, 0.45) 55%,
        rgba(9, 12, 19, 0.05) 80%,
        transparent 100%);
    pointer-events: none;
    z-index: 1;
}

/* Code chip floating top-left (on the image) */
.drp-grade-card__code-chip {
    position: absolute;
    top: 14px;
    left: 14px;
    z-index: 3;
    padding: 5px 11px;
    font-family: var(--font-display);
    font-size: 0.74rem;
    font-weight: 900;
    letter-spacing: 0.1em;
    color: var(--accent);
    background: rgba(9, 12, 19, 0.78);
    border: 1px solid var(--accent-border);
    border-radius: 4px;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

/* ── Body — sits in the dark gradient (bottom) ── */
.drp-grade-card__body {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2;                       /* above the gradient overlay */
    display: flex;
    flex-direction: column;
    gap: 3px;
    padding: 20px 18px 22px;
}

.drp-grade-card__code {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 900;                 /* extra bold */
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--accent);
    line-height: 1;
    margin-bottom: 5px;
}

.drp-grade-card__name {
    font-family: var(--font-body);
    font-size: 0.84rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.28;
}

.drp-grade-card__sub {
    font-family: var(--font-ui);
    font-size: 0.7rem;
    font-weight: 400;
    color: var(--text-secondary);
    letter-spacing: 0.02em;
}

/* ══════════════════════════════════════════════
   RESPONSIVE  — Tablet 3 cols · Mobile 2 cols
   ══════════════════════════════════════════════ */
@media (max-width: 1024px) {
    .grades-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 640px) {
    .grades-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .grades-section { padding: 40px 0 48px; }
    .drp-grade-card { min-height: 320px; }
    .drp-grade-card__code { font-size: 1.05rem; }
    .drp-grade-card__name { font-size: 0.78rem; }
}