/* Premium Single Product Page CSS - B2B Industrial HVAC Theme */
@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@300;400;500;600;700;800&display=swap');

:root {
    --primary: #0056d2; /* Royal Blue from Logo */
    --primary-hover: #0045ab;
    --accent: #e85220; /* Reddish Orange from Logo */
    --accent-hover: #cb3d0f;
    --dark-slate: #161616;
    --light-slate: #f4f4f4;
    --border-color: #e0e0e0;
    --text-main: #161616;
    --text-muted: #525252;
    --text-light: #ffffff;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 16px 40px rgba(15, 98, 254, 0.08);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --font-outfit: 'Be Vietnam Pro', sans-serif;
    --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.product-viewport-custom {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
    margin-bottom: 48px;
    background: #ffffff;
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0, 0, 0, 0.03);
}

/* Left Column: Visual Gallery */
.gallery-section-custom {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.main-preview-container-custom {
    position: relative;
    width: 100%;
    aspect-ratio: 1.1;
    background: var(--light-slate);
    border-radius: var(--radius-md);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.02);
}

.main-preview-container-custom img {
    max-width: 85%;
    max-height: 85%;
    object-fit: contain;
    transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.main-preview-container-custom:hover img {
    transform: scale(1.05);
}

.gallery-badge-custom {
    position: absolute;
    top: 16px;
    left: 16px;
    background: var(--dark-slate);
    color: var(--text-light);
    padding: 6px 12px;
    font-size: 12px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    z-index: 10;
}

.thumbnail-strip-custom {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.thumb-item-custom {
    aspect-ratio: 1;
    background: #ffffff;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    padding: 8px;
}

.thumb-item-custom:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
}

.thumb-item-custom.active {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(15, 98, 254, 0.15);
}

.thumb-item-custom img {
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
}

/* Right Column: Product Config & Details */
.info-section-custom {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.product-meta-header-custom {
    margin-bottom: 24px;
}

.product-brand-custom {
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 8px;
}

.product-title-custom {
    font-size: 32px;
    font-weight: 800;
    line-height: 1.2;
    color: var(--dark-slate);
    margin-bottom: 12px;
}

.product-rating-custom {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-muted);
}

.stars-custom {
    color: #f1c40f;
}

/* Price & Status */
.price-container-custom {
    padding: 20px;
    background: var(--light-slate);
    border-radius: var(--radius-md);
    margin-bottom: 28px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.price-container-custom > div:first-child {
    flex-shrink: 0;
}

.price-label-custom {
    font-size: 14px;
    color: var(--text-muted);
    font-weight: 500;
}

.price-value-custom {
    font-size: 24px;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.2;
}

.stock-status-custom {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: #2ecc71;
    font-weight: 600;
    flex-shrink: 0;
    white-space: nowrap;
}

.stock-dot-custom {
    width: 8px;
    height: 8px;
    background-color: #2ecc71;
    border-radius: 50%;
    animation: pulse 1.5s infinite;
    flex-shrink: 0;
}

/* Dynamic Configuration Selectors */
.config-group-custom {
    margin-bottom: 24px;
}

.config-title-custom {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--dark-slate);
    display: flex;
    justify-content: space-between;
}

.config-title-custom span.selected-value {
    font-weight: 400;
    color: var(--text-muted);
}

.selector-grid-custom {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.selector-btn-custom {
    padding: 12px;
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    text-align: center;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
}

.selector-btn-custom:hover {
    border-color: var(--primary);
    background: rgba(0, 86, 210, 0.02);
}

.selector-btn-custom.active {
    border-color: var(--primary);
    background: rgba(0, 86, 210, 0.05);
    color: var(--primary);
    font-weight: 600;
    box-shadow: 0 0 0 2px rgba(0, 86, 210, 0.1);
}

/* Dimension Info Banner */
.dimension-summary-custom {
    background: rgba(232, 82, 32, 0.04);
    border-left: 4px solid var(--accent);
    padding: 14px 18px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-bottom: 28px;
    font-size: 14px;
    color: #a83c16;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.dimension-summary-custom strong {
    color: var(--accent);
}

/* CTA Action Buttons */
.action-buttons-custom {
    display: grid;
    grid-template-columns: 1.3fr 0.7fr;
    gap: 16px;
    margin-top: 12px;
}

.action-buttons-custom button.btn-custom {
    padding: 16px 28px !important;
    font-size: 15px !important;
    font-weight: 700 !important;
    letter-spacing: 0.5px !important;
    text-transform: uppercase !important;
    border-radius: 30px !important;
    cursor: pointer !important;
    border: none !important;
    transition: var(--transition) !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 8px !important;
    height: auto !important;
    min-height: 0 !important;
    line-height: 1.2 !important;
    box-shadow: none !important;
}

.action-buttons-custom button.btn-primary-custom {
    background: var(--accent) !important;
    color: var(--text-light) !important;
    box-shadow: 0 4px 18px rgba(255, 107, 0, 0.25) !important;
}

.action-buttons-custom button.btn-primary-custom:hover {
    background: var(--accent-hover) !important;
    transform: translateY(-2px) !important;
    box-shadow: 0 6px 24px rgba(255, 107, 0, 0.35) !important;
}

.action-buttons-custom button.btn-secondary-custom {
    background: var(--dark-slate) !important;
    color: var(--text-light) !important;
    box-shadow: 0 4px 18px rgba(0, 0, 0, 0.15) !important;
}

.action-buttons-custom button.btn-secondary-custom:hover {
    background: #333333 !important;
    transform: translateY(-2px) !important;
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.25) !important;
}

/* Details Section (Tabs) */
.product-details-section-custom {
    background: #ffffff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0, 0, 0, 0.03);
    padding: 32px;
    margin-bottom: 48px;
}

.tab-headers-custom {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 24px;
    gap: 8px;
}

.tab-link-custom {
    padding: 10px 24px !important;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-muted) !important;
    background: #f4f4f4 !important;
    border: 1px solid var(--border-color) !important;
    border-top: 3px solid #f4f4f4 !important;
    border-bottom: none !important;
    cursor: pointer;
    position: relative;
    transition: var(--transition);
    border-radius: 8px 8px 0 0 !important;
    margin-bottom: -1px !important;
}

.tab-link-custom:hover {
    color: var(--primary) !important;
    background: #e9e9e9 !important;
    border-top-color: #e9e9e9 !important;
}

.tab-link-custom.active {
    color: var(--primary) !important;
    background: #ffffff !important;
    border-color: var(--border-color) !important;
    border-top: 3px solid var(--primary) !important;
    border-bottom-color: #ffffff !important;
}

.tab-pane-custom {
    display: none;
    animation: fadeIn 0.4s ease;
}

.tab-pane-custom.active {
    display: block;
}

/* Specs Table styling */
.specs-table-custom {
    width: 100%;
    border-collapse: collapse;
    margin-top: 16px;
}

.specs-table-custom tr {
    border-bottom: 1px solid var(--border-color);
}

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

.specs-table-custom td {
    padding: 14px 20px;
    font-size: 15px;
}

.specs-table-custom td.spec-name {
    font-weight: 600;
    color: var(--text-muted);
    width: 30%;
    background: var(--light-slate);
}

.specs-table-custom td.spec-value {
    color: var(--dark-slate);
}

/* Modal Popup for B2B Quotes */
.modal-overlay-custom {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal-overlay-custom.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-content-custom {
    background: #ffffff;
    width: 100%;
    max-width: 500px;
    border-radius: var(--radius-lg);
    box-shadow: 0 24px 64px rgba(0,0,0,0.15);
    padding: 32px;
    position: relative;
    transform: translateY(20px);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay-custom.active .modal-content-custom {
    transform: translateY(0);
}

.modal-overlay-custom .modal-content-custom .modal-close-custom {
    position: absolute !important;
    top: 20px !important;
    right: 20px !important;
    left: auto !important;
    font-size: 28px !important;
    color: var(--text-muted) !important;
    background: transparent !important;
    border: none !important;
    padding: 0 !important;
    width: 32px !important;
    height: 32px !important;
    line-height: 32px !important;
    text-align: center !important;
    cursor: pointer !important;
    border-radius: 50% !important;
    transition: var(--transition) !important;
    box-shadow: none !important;
    display: inline-block !important;
    float: none !important;
}

.modal-overlay-custom .modal-content-custom .modal-close-custom:hover {
    color: var(--dark-slate) !important;
    background: rgba(0, 0, 0, 0.05) !important;
}

.modal-title-custom {
    font-size: 22px;
    font-weight: 800;
    margin-bottom: 8px;
    color: var(--dark-slate);
}

.modal-desc-custom {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.form-group-custom {
    margin-bottom: 20px;
}

.form-label-custom {
    display: block;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-main);
}

.form-control-custom {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 15px;
    outline: none;
    transition: var(--transition);
}

.form-control-custom:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(15, 98, 254, 0.1);
}

/* Keyframes & Animations */
@keyframes pulse {
    0% { transform: scale(0.9); opacity: 0.6; }
    50% { transform: scale(1.1); opacity: 1; }
    100% { transform: scale(0.9); opacity: 0.6; }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   Responsive Styles for Tablet & Mobile (Optimized B2B UI)
   ========================================================================== */

/* 1. Tablet Portrait and Small Landscape (max-width: 1024px) */
@media (max-width: 1024px) {
    .product-viewport-custom {
        grid-template-columns: 1fr;
        gap: 32px;
        padding: 24px;
    }
    
    .gallery-section-custom {
        max-width: 600px;
        margin: 0 auto;
        width: 100%;
    }
    
    .action-buttons-custom {
        grid-template-columns: 1.2fr 0.8fr;
    }
}

/* 2. Mobile Landscape & Portrait (max-width: 768px) */
@media (max-width: 768px) {
    .tab-pane-custom[id="tab-desc"] > div {
        grid-template-columns: 1fr !important;
        gap: 24px !important;
    }
    
    .product-details-section-custom {
        padding: 24px;
    }
    
    .tab-headers-custom {
        gap: 4px;
    }
    
    .tab-link-custom {
        padding: 10px 16px !important;
        font-size: 14px !important;
    }
}

/* 3. Small Mobile Devices (max-width: 576px) */
@media (max-width: 576px) {
    .product-viewport-custom {
        padding: 16px;
        border-radius: var(--radius-md);
        gap: 24px;
    }
    
    .product-title-custom {
        font-size: 24px !important;
    }
    
    .action-buttons-custom {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .action-buttons-custom button.btn-custom {
        padding: 14px 20px !important;
        font-size: 14px !important;
    }
    
    .selector-grid-custom {
        gap: 8px;
    }
    
    .selector-btn-custom {
        padding: 8px 4px !important;
        font-size: 13px !important;
    }
    
    .thumbnail-strip-custom {
        gap: 8px;
    }
    
    .modal-content-custom {
        padding: 24px 20px !important;
        margin: 0 16px;
        max-width: calc(100% - 32px);
    }
    
    .modal-title-custom {
        font-size: 20px !important;
    }
    
    .modal-overlay-custom .modal-content-custom .modal-close-custom {
        top: 15px !important;
        right: 15px !important;
    }
}

/* 4. Extra Small Mobile Devices (max-width: 380px) */
@media (max-width: 380px) {
    .product-title-custom {
        font-size: 20px !important;
    }
    
    .selector-grid-custom {
        grid-template-columns: repeat(2, 1fr);
    }
}