/* ─────────────────────────────────────────────────
   Build-Guide Page – Additional Styles
   (Extends styles.css + project.css)
───────────────────────────────────────────────── */

/* ── Hero full-width image ── */
.guide-hero-image {
    position: relative;
    width: 100%;
    max-height: 540px;
    overflow: hidden;
    background: #000;
}

.guide-hero-image img {
    width: 100%;
    height: 540px;
    object-fit: cover;
    opacity: 0.8;
}

.guide-hero-overlay {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
}

.guide-hero-label {
    font-family: var(--font-head);
    font-size: 0.68rem;
    letter-spacing: 0.22em;
    color: var(--clr-blue);
    background: rgba(8, 12, 20, 0.8);
    border: 1px solid var(--clr-border);
    padding: 6px 18px;
    border-radius: 100px;
    text-transform: uppercase;
}

/* ── Section wrappers ── */
.guide-section {
    padding: 100px 0;
}

.bg-surface {
    background: var(--clr-surface);
}

.bg-bg {
    background: var(--clr-bg);
}

.guide-section-header {
    margin-bottom: 56px;
}

/* ── Overview grid ── */
.overview-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 64px;
    align-items: start;
}

.overview-text p {
    color: var(--clr-muted);
    font-size: 1.02rem;
    line-height: 1.8;
    margin-bottom: 18px;
}

.overview-text p strong {
    color: var(--clr-text);
}

/* Stats panel */
.stats-panel {
    background: var(--clr-card);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.stat-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 22px;
    border-bottom: 1px solid var(--clr-border);
    transition: background var(--transition);
}

.stat-row:hover {
    background: rgba(0, 180, 255, 0.04);
}

.stat-row.last {
    border-bottom: none;
}

.stat-row-label {
    font-family: var(--font-head);
    font-size: 0.68rem;
    color: var(--clr-muted);
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.stat-row-value {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--clr-text);
}

.stat-row-value.highlight {
    color: var(--clr-blue);
}

/* ── Print settings cards ── */
.print-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
}

.print-card-wide {
    grid-column: 1 / -1;
}

.print-card {
    background: var(--clr-card);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: border-color var(--transition);
}

.print-card:hover {
    border-color: var(--clr-blue-dim);
}

.print-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
}

.print-card-icon {
    font-size: 1.6rem;
}

.print-card-header h3 {
    font-family: var(--font-head);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--clr-white);
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

/* Spec table */
.spec-table {
    width: 100%;
    border-collapse: collapse;
}

.spec-table tr {
    border-bottom: 1px solid var(--clr-border);
}

.spec-table tr:last-child {
    border-bottom: none;
}

.spec-table td {
    padding: 10px 0;
    font-size: 0.9rem;
    color: var(--clr-muted);
}

.spec-table td:first-child {
    color: var(--clr-blue);
    font-family: var(--font-head);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    width: 45%;
    padding-right: 12px;
}

.spec-table strong {
    color: var(--clr-text);
}

/* Parts list */
.parts-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.parts-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 9px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    font-size: 0.85rem;
}

.part-qty {
    font-family: var(--font-head);
    font-size: 0.7rem;
    color: var(--clr-blue);
    min-width: 28px;
    font-weight: 700;
}

.part-name {
    font-family: 'Fira Code', monospace;
    color: var(--clr-text);
    flex: 1;
    font-size: 0.78rem;
}

.part-note {
    font-size: 0.72rem;
    color: var(--clr-muted);
    white-space: nowrap;
}

/* Tips grid in wide card */
.tips-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
}

.tip-item {
    padding: 18px 0;
    border-top: 1px solid var(--clr-border);
}

.tip-title {
    display: block;
    font-family: var(--font-head);
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--clr-blue);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 8px;
}

.tip-item p {
    color: var(--clr-muted);
    font-size: 0.88rem;
    line-height: 1.7;
}

/* ── BOM – product cards ── */
.bom-category {
    margin-bottom: 60px;
}

.bom-category:last-child {
    margin-bottom: 0;
}

.bom-category-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 28px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--clr-border);
}

.bom-icon {
    font-size: 1.6rem;
}

.bom-category-header h3 {
    font-family: var(--font-head);
    font-size: 1rem;
    font-weight: 700;
    color: var(--clr-white);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

/* BOM full-width image */
.bom-image {
    margin-bottom: 56px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--clr-border);
}

.bom-image img {
    width: 100%;
    max-height: 420px;
    object-fit: cover;
}

.image-caption {
    padding: 14px 20px;
    font-size: 0.82rem;
    color: var(--clr-muted);
    background: var(--clr-card);
    text-align: center;
    font-style: italic;
}

/* BOM table */
.bom-table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius);
    border: 1px solid var(--clr-border);
}

.bom-table {
    width: 100%;
    border-collapse: collapse;
}

.bom-table thead tr {
    background: rgba(0, 180, 255, 0.08);
}

.bom-table th {
    font-family: var(--font-head);
    font-size: 0.66rem;
    font-weight: 700;
    color: var(--clr-blue);
    letter-spacing: 0.14em;
    text-transform: uppercase;
    padding: 12px 18px;
    text-align: left;
    border-bottom: 1px solid var(--clr-border);
}

.bom-table td {
    padding: 12px 18px;
    font-size: 0.9rem;
    color: var(--clr-muted);
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.bom-table tr:last-child td {
    border-bottom: none;
}

.bom-table tr:hover td {
    background: rgba(0, 180, 255, 0.03);
}

.bom-table td:first-child {
    font-family: var(--font-head);
    font-size: 0.72rem;
    color: var(--clr-blue);
    font-weight: 700;
}

/* Product cards */
.product-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 22px;
}

.product-card {
    background: var(--clr-card);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-lg);
    padding: 26px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--clr-blue), transparent);
    opacity: 0;
    transition: opacity var(--transition);
}

.product-card:hover {
    border-color: var(--clr-blue-dim);
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.product-card:hover::before {
    opacity: 1;
}

.product-card-tag {
    font-family: var(--font-head);
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--clr-blue);
    margin-bottom: 2px;
}

.product-card-name {
    font-family: var(--font-head);
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--clr-white);
    line-height: 1.3;
}

.product-card-spec {
    font-family: 'Fira Code', monospace;
    font-size: 0.75rem;
    color: var(--clr-muted);
    margin-bottom: 4px;
}

.product-card-desc {
    color: var(--clr-muted);
    font-size: 0.86rem;
    line-height: 1.65;
    flex: 1;
}

.product-card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--clr-border);
}

.product-price {
    font-family: var(--font-head);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--clr-text);
}

.product-link {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--clr-blue);
    transition: color var(--transition);
}

.product-link:hover {
    color: var(--clr-accent);
}

/* Tools grid */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
}

.tool-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: var(--clr-card);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius);
    font-size: 0.88rem;
    color: var(--clr-text);
    transition: border-color var(--transition);
}

.tool-item::before {
    content: '→';
    color: var(--clr-blue);
    font-weight: 700;
    flex-shrink: 0;
}

.tool-item:hover {
    border-color: var(--clr-blue-dim);
}

/* ── Exploded view ── */
.exploded-wrapper {
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--clr-border);
    margin-bottom: 48px;
    background: #000;
}

.exploded-wrapper img {
    width: 100%;
    max-height: 500px;
    object-fit: contain;
    padding: 24px;
}

.sub-assembly-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 20px;
}

.sub-item {
    display: flex;
    align-items: flex-start;
    gap: 18px;
    padding: 22px;
    background: var(--clr-card);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius);
    transition: border-color var(--transition);
}

.sub-item:hover {
    border-color: var(--clr-blue-dim);
}

.sub-number {
    font-family: var(--font-head);
    font-size: 1.4rem;
    font-weight: 900;
    color: var(--clr-blue);
    min-width: 36px;
    line-height: 1;
    margin-top: 2px;
}

.sub-item strong {
    display: block;
    font-family: var(--font-head);
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--clr-white);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: 6px;
}

.sub-item p {
    color: var(--clr-muted);
    font-size: 0.86rem;
    line-height: 1.65;
}

/* ── Step-by-step assembly ── */
.step-block {
    display: grid;
    grid-template-columns: 72px 1fr;
    gap: 0 32px;
    margin-bottom: 60px;
    position: relative;
}

.step-block.last-step {
    margin-bottom: 0;
}

.step-number-col {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.step-number {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: rgba(0, 180, 255, 0.1);
    border: 1.5px solid var(--clr-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-head);
    font-size: 1.1rem;
    font-weight: 900;
    color: var(--clr-blue);
    flex-shrink: 0;
}

.step-number.finish {
    background: rgba(0, 180, 255, 0.2);
    font-size: 1.4rem;
}

.step-connector {
    width: 1.5px;
    flex: 1;
    background: var(--clr-border);
    margin-top: 12px;
}

.step-tag {
    font-family: var(--font-head);
    font-size: 0.65rem;
    letter-spacing: 0.2em;
    color: var(--clr-blue);
    text-transform: uppercase;
    margin-bottom: 8px;
}

.step-title {
    font-family: var(--font-head);
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    font-weight: 700;
    color: var(--clr-white);
    margin-bottom: 14px;
    line-height: 1.2;
}

.step-parts {
    background: rgba(0, 180, 255, 0.06);
    border: 1px solid rgba(0, 180, 255, 0.18);
    border-radius: var(--radius);
    padding: 12px 18px;
    font-size: 0.86rem;
    color: var(--clr-muted);
    margin-bottom: 20px;
}

.step-parts strong {
    color: var(--clr-blue);
    font-family: var(--font-head);
    font-size: 0.68rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.step-instructions {
    padding-left: 22px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}

.step-instructions li {
    color: var(--clr-muted);
    font-size: 0.95rem;
    line-height: 1.75;
    padding-left: 6px;
}

.step-instructions li strong {
    color: var(--clr-text);
}

.step-instructions li em {
    color: var(--clr-blue);
    font-style: normal;
}

.step-instructions code {
    font-family: 'Fira Code', monospace;
    font-size: 0.82rem;
    background: rgba(0, 180, 255, 0.08);
    border: 1px solid rgba(0, 180, 255, 0.2);
    padding: 1px 7px;
    border-radius: 4px;
    color: var(--clr-blue);
}

/* Warning / Tip notes */
.step-note {
    display: flex;
    gap: 14px;
    padding: 16px 20px;
    border-radius: var(--radius);
    background: rgba(255, 100, 80, 0.06);
    border-left: 3px solid rgba(255, 100, 80, 0.6);
    margin-top: 8px;
}

.step-note.tip {
    background: rgba(0, 180, 255, 0.06);
    border-left-color: var(--clr-blue);
}

.step-note-icon {
    font-size: 1.1rem;
    flex-shrink: 0;
    margin-top: 1px;
}

.step-note p {
    color: var(--clr-muted);
    font-size: 0.9rem;
    line-height: 1.65;
}

.step-note p strong {
    color: var(--clr-text);
}

/* Wire colour labels */
.wire-brown {
    color: #c8a060;
    font-weight: 600;
}

.wire-red {
    color: #f87171;
    font-weight: 600;
}

.wire-orange {
    color: #fb923c;
    font-weight: 600;
}

/* ── Responsive ── */
@media (max-width: 900px) {
    .overview-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

    .print-card-wide {
        grid-column: 1;
    }

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

    .step-block {
        grid-template-columns: 48px 1fr;
        gap: 0 18px;
    }

    .step-number {
        width: 44px;
        height: 44px;
        font-size: 0.9rem;
    }

    .sub-assembly-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    .guide-hero-image img {
        height: 280px;
    }

    .bom-table th,
    .bom-table td {
        padding: 10px 12px;
        font-size: 0.82rem;
    }

    .product-cards-grid {
        grid-template-columns: 1fr;
    }

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