/* ==========================================================================
   TUBA Tools B2B Website - Premium Industrial Theme CSS (Enhanced Edition)
   ========================================================================== */

/* --- 1. CSS Variables & Reset --- */
:root {
    --primary: #008B7A;
    --primary-hover: #007365;
    --primary-glow: rgba(0, 139, 122, 0.12);
    --dark-bg: #F4F7F6;
    --dark-surface: #FFFFFF;
    --dark-border: #D1DBDF;
    --text-main: #1D262B;
    --text-muted: #5A6973;
    --white: #FFFFFF;
    --accent: #D97706;
    --accent-glow: rgba(217, 119, 6, 0.12);
    
    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    background-color: var(--dark-bg);
    color: var(--text-main);
    font-family: var(--font-body);
    font-size: 16px;
    overflow-x: hidden;
}

body {
    overflow-x: hidden;
    line-height: 1.6;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background-image: 
        radial-gradient(rgba(0, 139, 122, 0.03) 1px, transparent 1px),
        linear-gradient(rgba(209, 219, 223, 0.3) 1px, transparent 1px),
        linear-gradient(90deg, rgba(209, 219, 223, 0.3) 1px, transparent 1px);
    background-size: 32px 32px, 96px 96px, 96px 96px;
    background-position: center center;
    pointer-events: none;
    z-index: -1;
}

/* --- 2. Typography & Headings --- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--text-main);
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.5rem, 5vw, 3.8rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.5rem); margin-bottom: 1rem; }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); margin-bottom: 0.5rem; }

p {
    color: var(--text-muted);
    font-size: 1rem;
    margin-bottom: 1.5rem;
}

/* --- 3. Custom Scrollbar --- */
::-webkit-scrollbar {
    width: 10px;
}
::-webkit-scrollbar-track {
    background: var(--dark-bg);
}
::-webkit-scrollbar-thumb {
    background: var(--dark-border);
    border-radius: 5px;
    border: 2px solid var(--dark-bg);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

/* --- 4. Layout Utilities --- */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 6rem 0;
    border-bottom: 1px solid var(--dark-border);
}

.section-darker {
    background-color: var(--dark-bg);
}

.text-center {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 4rem auto;
}

.text-center h2 {
    position: relative;
    display: inline-block;
}

.text-center h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background-color: var(--primary);
    border-radius: 2px;
}

/* --- 5. Buttons & Badges --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.8rem 1.8rem;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1rem;
    border-radius: 8px;
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition-smooth);
    border: none;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--primary);
    color: var(--white);
    box-shadow: 0 4px 15px var(--primary-glow);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 255, 209, 0.6);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-main);
    border: 1px solid var(--dark-border);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: var(--text-muted);
    transform: translateY(-2px);
}

.btn-block {
    display: flex;
    width: 100%;
}

.badge {
    display: inline-flex;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    border-radius: 20px;
    background-color: var(--dark-border);
    color: var(--text-main);
    border: 1px solid var(--dark-border);
    margin-bottom: 1rem;
}

.badge-primary {
    background-color: rgba(0, 255, 209, 0.1);
    color: var(--primary);
    border-color: rgba(0, 255, 209, 0.2);
}

.badge-accent {
    background-color: rgba(244, 162, 97, 0.1);
    color: var(--accent);
    border-color: rgba(244, 162, 97, 0.2);
}

/* --- 6. Navigation Header --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(244, 247, 246, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 139, 122, 0.1);
    transition: var(--transition-smooth);
}

.header-scrolled {
    padding: 0.5rem 0;
    background-color: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid rgba(0, 139, 122, 0.15);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.05);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo-link {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 42px;
    object-fit: contain;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-muted);
    font-family: var(--font-heading);
    font-weight: 500;
    font-size: 1rem;
    transition: var(--transition-smooth);
    position: relative;
    padding: 0.5rem 0;
}

.nav-link:hover, .nav-link.active {
    color: var(--white);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary);
    transition: var(--transition-smooth);
}

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

.header-ctas {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.basket-btn {
    position: relative;
    background: var(--dark-surface);
    border: 1px solid var(--dark-border);
    color: var(--white);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.basket-btn:hover {
    border-color: var(--primary);
    box-shadow: 0 0 10px var(--primary-glow);
    transform: scale(1.05);
}

.basket-count {
    position: absolute;
    top: -5px;
    right: -5px;
    background-color: var(--primary);
    color: var(--white);
    font-size: 0.75rem;
    font-weight: 700;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--dark-bg);
    animation: pulse 2s infinite;
}

/* --- 7. Hero Section --- */
.hero {
    position: relative;
    min-height: 100vh;
    padding-top: 120px;
    display: flex;
    align-items: center;
    background: radial-gradient(circle at 70% 30%, rgba(0, 139, 122, 0.06) 0%, rgba(244, 247, 246, 0) 60%),
                radial-gradient(circle at 10% 80%, rgba(217, 119, 6, 0.04) 0%, rgba(244, 247, 246, 0) 50%);
    overflow: hidden;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
    align-items: center;
}

.hero-text {
    z-index: 10;
}

.hero-text h1 {
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.hero-text p {
    font-size: 1.15rem;
    margin-bottom: 2.5rem;
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 5;
}

.hero-glow-orb {
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--primary-glow) 0%, rgba(0, 255, 209, 0) 70%);
    filter: blur(40px);
    z-index: 1;
}

.hero-img {
    max-width: 100%;
    max-height: 500px;
    object-fit: contain;
    position: relative;
    z-index: 2;
    animation: floating 6s ease-in-out infinite;
}

/* --- 8. Stats Banner --- */
.stats {
    background-color: var(--dark-surface);
    border-top: 1px solid var(--dark-border);
    border-bottom: 1px solid var(--dark-border);
    padding: 3rem 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    text-align: center;
}

.stats-number {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 0.5rem;
    text-shadow: 0 0 20px rgba(0, 255, 209, 0.2);
}

.stats-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-main);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* --- 9. Core Technology Grid --- */
.tech-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.tech-card {
    background-color: var(--dark-surface);
    border: 1px solid var(--dark-border);
    border-radius: 16px;
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.tech-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background-color: var(--primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition-smooth);
}

.tech-card:hover {
    transform: translateY(-5px);
    border-color: rgba(0, 139, 122, 0.3);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.tech-card:hover::before {
    transform: scaleX(1);
}

.tech-card-content h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.tech-img-wrapper {
    margin-top: 2rem;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--dark-border);
    height: 240px;
    position: relative;
}

.tech-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-smooth);
}

.tech-card:hover .tech-img {
    transform: scale(1.05);
}

/* --- 10. Product Catalog Grid & Tabs --- */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 2rem;
}

.product-card {
    background-color: var(--dark-surface);
    border: 1px solid var(--dark-border);
    border-radius: 16px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    transition: var(--transition-smooth);
    position: relative;
}

.product-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: 0 10px 25px var(--primary-glow);
}

.product-img-holder {
    height: 220px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle, rgba(0, 139, 122, 0.05) 0%, rgba(244, 247, 246, 0.2) 80%);
    border-radius: 12px;
    margin-bottom: 1rem;
    position: relative;
    overflow: hidden;
}

.product-img {
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
    transition: var(--transition-smooth);
}

.product-card:hover .product-img {
    transform: scale(1.06);
}

/* Interactive Tabs inside Product Card */
.product-tabs {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

.tab-btn {
    background: var(--dark-bg);
    border: 1px solid var(--dark-border);
    color: var(--text-muted);
    padding: 0.3rem 0.6rem;
    font-size: 0.75rem;
    font-family: var(--font-heading);
    font-weight: 600;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.tab-btn:hover, .tab-btn.active {
    border-color: var(--primary);
    color: var(--white);
    background-color: rgba(0, 255, 209, 0.1);
}

.product-info {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.product-sku {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--primary);
    text-transform: uppercase;
    margin-bottom: 0.25rem;
}

.product-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.product-specs {
    border-top: 1px solid var(--dark-border);
    padding-top: 1rem;
    margin-bottom: 1.5rem;
    list-style: none;
}

.product-specs li {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.product-specs li span:last-child {
    color: var(--text-main);
    font-weight: 600;
}

/* --- 11. Battery Range Section --- */
.battery-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 2rem;
}

.battery-card {
    background-color: var(--dark-surface);
    border: 1px solid var(--dark-border);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    transition: var(--transition-smooth);
}

.battery-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: 0 10px 20px rgba(0, 255, 209, 0.1);
}

.battery-img-holder {
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.battery-img {
    max-width: 85%;
    max-height: 85%;
    object-fit: contain;
}

/* --- 12. Accessories Showcase --- */
.acc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1.5rem;
}

.acc-card {
    background-color: var(--dark-surface);
    border: 1px solid var(--dark-border);
    border-radius: 12px;
    padding: 1.25rem;
    transition: var(--transition-smooth);
    text-align: center;
}

.acc-card:hover {
    border-color: var(--primary);
    transform: translateY(-3px);
}

.acc-img-holder {
    height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    background: rgba(0, 0, 0, 0.02);
    border-radius: 8px;
}

.acc-card-img {
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
}

.acc-title {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.acc-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* --- 13. Specialty Spray Section --- */
.spray-banner {
    background: linear-gradient(135deg, var(--dark-surface) 0%, var(--dark-bg) 100%);
    border: 1px solid var(--dark-border);
    border-radius: 24px;
    padding: 4rem;
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.spray-banner-content h2 {
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
}

.spray-carousel {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.spray-item {
    background-color: rgba(0, 0, 0, 0.02);
    border: 1px solid var(--dark-border);
    border-radius: 12px;
    padding: 1rem;
    text-align: center;
    transition: var(--transition-smooth);
}

.spray-item:hover {
    border-color: var(--primary);
    background-color: rgba(0, 139, 122, 0.05);
    transform: translateY(-4px);
}

.spray-item-img {
    height: 110px;
    object-fit: contain;
    margin-bottom: 1rem;
    width: 100%;
}

.spray-item-name {
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 700;
}

/* --- 14. Factory & OEM Tour --- */
.factory-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.factory-card {
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--dark-border);
    background-color: var(--dark-surface);
    transition: var(--transition-smooth);
    position: relative;
    height: 380px;
}

.factory-card-img-holder {
    height: 240px;
    overflow: hidden;
}

.factory-card-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-smooth);
}

.factory-card:hover .factory-card-img {
    transform: scale(1.06);
}

.factory-card-info {
    padding: 1.25rem;
}

.factory-card:hover {
    border-color: var(--primary);
    box-shadow: 0 10px 20px rgba(0, 255, 209, 0.1);
}

/* --- 15. Exhibition Section --- */
.exhibition-banner {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 4rem;
    align-items: center;
}

.exhibition-img-holder {
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid var(--dark-border);
    box-shadow: 0 15px 35px rgba(0,0,0,0.5);
}

.exhibition-img {
    width: 100%;
    height: auto;
    display: block;
}

/* --- 16. Contact Form / RFQ Section --- */
.contact-grid {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 4rem;
}

.contact-info-list {
    list-style: none;
    margin-top: 2rem;
}

.contact-info-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.contact-info-icon {
    color: var(--primary);
    font-size: 1.25rem;
    margin-top: 0.25rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
}

input, select, textarea {
    width: 100%;
    padding: 0.9rem 1.2rem;
    background-color: var(--dark-surface);
    border: 1px solid var(--dark-border);
    border-radius: 8px;
    color: var(--text-main);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: var(--transition-smooth);
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 10px rgba(0, 255, 209, 0.2);
}

/* --- 17. Footer --- */
.footer {
    background-color: var(--dark-bg);
    padding: 4rem 0 2rem 0;
    border-top: 1px solid var(--dark-border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 4rem;
}

.footer-column h4 {
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1.5rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition-smooth);
    font-size: 0.95rem;
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-bottom {
    border-top: 1px solid var(--dark-border);
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* --- 18. Inquiry Drawer (Slide-out Cart) --- */
.drawer-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-smooth);
    backdrop-filter: blur(5px);
}

.drawer-overlay.active {
    opacity: 1;
    visibility: visible;
}

.drawer {
    position: fixed;
    top: 0;
    right: -450px;
    width: 450px;
    height: 100vh;
    background-color: var(--dark-surface);
    border-left: 1px solid var(--dark-border);
    z-index: 2001;
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.08);
    display: flex;
    flex-direction: column;
    transition: transform 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

.drawer-overlay.active + .drawer {
    transform: translateX(-450px);
}

.drawer-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--dark-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.drawer-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.drawer-close:hover {
    color: var(--text-main);
    transform: rotate(90deg);
}

.drawer-body {
    flex-grow: 1;
    padding: 1.5rem;
    overflow-y: auto;
}

.drawer-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
    text-align: center;
}

.drawer-empty-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--dark-border);
}

.basket-list {
    list-style: none;
}

.basket-item {
    display: flex;
    gap: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--dark-border);
    align-items: center;
}

.basket-item-img {
    width: 60px;
    height: 60px;
    object-fit: contain;
    background: rgba(0, 0, 0, 0.02);
    border: 1px solid var(--dark-border);
    border-radius: 6px;
}

.basket-item-details {
    flex-grow: 1;
}

.basket-item-name {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text-main);
}

.basket-item-sku {
    font-size: 0.75rem;
    color: var(--primary);
    text-transform: uppercase;
}

.basket-item-quantity {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.25rem;
}

.qty-btn {
    background-color: var(--dark-border);
    border: none;
    color: var(--text-main);
    width: 24px;
    height: 24px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-weight: 700;
}

.qty-btn:hover {
    background-color: var(--primary);
    color: var(--white);
}

.qty-val {
    font-size: 0.9rem;
    font-weight: 600;
    width: 20px;
    text-align: center;
}

.basket-item-remove {
    background: none;
    border: none;
    color: oklch(60% 0.22 28);
    cursor: pointer;
    transition: var(--transition-smooth);
}

.basket-item-remove:hover {
    color: oklch(70% 0.15 28);
    transform: scale(1.1);
}

.drawer-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--dark-border);
    background-color: var(--dark-surface);
}

/* --- 19. Animations --- */
@keyframes floating {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-15px); }
    100% { transform: translateY(0px); }
}

@keyframes pulse {
    0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(0, 255, 209, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 10px rgba(0, 255, 209, 0); }
    100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(0, 255, 209, 0); }
}

/* --- 20. Responsive adjustments --- */
@media (max-width: 992px) {
    .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
    }
    .hero-buttons {
        justify-content: center;
    }
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .tech-grid {
        grid-template-columns: 1fr;
    }
    .battery-grid {
        grid-template-columns: 1fr;
    }
    .spray-banner {
        grid-template-columns: 1fr;
        padding: 2.5rem;
    }
    .factory-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .exhibition-banner {
        grid-template-columns: 1fr;
    }
    .contact-grid {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 576px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    .factory-grid {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .drawer {
        width: 100vw;
        right: -100vw;
    }
    .drawer-overlay.active + .drawer {
        transform: translateX(-100vw);
    }
    .nav-menu {
        display: none; /* simple mobile nav override */
    }
}