/* ============================================
   ProtoYap Engineering - Corporate Website
   ============================================ */

:root {
    --bg-primary: #0a1628;
    --bg-secondary: #0f1d32;
    --bg-card: #131f35;
    --bg-card-hover: #182640;
    --text-primary: #e8ecf4;
    --text-secondary: #8a9bb5;
    --text-muted: #5a6e8a;
    --accent: #00d4aa;
    --accent-light: #00f0c0;
    --accent-dark: #00a888;
    --accent-glow: rgba(0, 212, 170, 0.15);
    --accent-secondary: #4a9eff;
    --border: rgba(255, 255, 255, 0.06);
    --border-light: rgba(255, 255, 255, 0.1);
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 20px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.4);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--accent-light);
}

/* --- Top Bar --- */
.topbar {
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid var(--border);
    padding: 8px 0;
    font-size: 0.82rem;
}

.topbar-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.topbar-left {
    display: flex;
    gap: 24px;
}

.topbar-left a,
.topbar-right a {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    font-weight: 500;
}

.topbar-left a:hover,
.topbar-right a:hover {
    color: var(--accent);
}

/* Language Switcher */
.lang-switch {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-right: 16px;
}

.lang-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 0.78rem;
    font-weight: 600;
    font-family: var(--font);
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 4px;
    transition: all var(--transition);
    letter-spacing: 0.03em;
}

.lang-btn:hover {
    color: var(--text-primary);
}

.lang-btn.active {
    color: var(--accent);
    background: var(--accent-glow);
}

.lang-divider {
    color: var(--text-muted);
    font-size: 0.75rem;
    opacity: 0.5;
}

.topbar-right {
    display: flex;
    align-items: center;
}

/* --- Navigation --- */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 14px 0;
    background: rgba(10, 22, 40, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: all var(--transition);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary);
}

.logo:hover { color: var(--text-primary); }

.logo-icon { color: var(--accent); }

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.logo-name {
    font-weight: 800;
    font-size: 1.15rem;
    letter-spacing: -0.02em;
}

.logo-tagline {
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.15em;
}

.nav-links {
    display: flex;
    align-items: center;
    list-style: none;
    gap: 4px;
}

.nav-links a {
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition);
    border-radius: 2px;
}

.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all var(--transition);
    border: none;
    font-family: var(--font);
    letter-spacing: -0.01em;
}

.btn-primary {
    background: var(--accent);
    color: var(--bg-primary);
}

.btn-primary:hover {
    background: var(--accent-light);
    color: var(--bg-primary);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 212, 170, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-light);
}

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

.btn-nav {
    background: var(--accent);
    color: var(--bg-primary) !important;
    padding: 8px 20px;
    font-size: 0.85rem;
}

.btn-nav:hover {
    background: var(--accent-light) !important;
    color: var(--bg-primary) !important;
}

.btn-lg {
    padding: 16px 40px;
    font-size: 1.05rem;
}

.btn-full { width: 100%; }

.btn.success {
    background: var(--accent);
    color: var(--bg-primary);
}

/* --- Hero --- */
.hero {
    position: relative;
    display: flex;
    flex-direction: column;
    min-height: calc(100vh - 100px);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.circuit-grid {
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 50%, rgba(0, 212, 170, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(74, 158, 255, 0.06) 0%, transparent 50%);
}

.circuit-grid::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.hero-content {
    position: relative;
    z-index: 1;
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 80px 0 60px;
    max-width: 720px;
}

.hero h1 {
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 32px;
    max-width: 580px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-bottom {
    position: relative;
    z-index: 1;
    padding-bottom: 0;
}

.hero-features {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: var(--radius) var(--radius) 0 0;
    overflow: hidden;
}

.hero-feature {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 24px 20px;
    background: var(--bg-secondary);
    transition: all var(--transition);
}

.hero-feature:hover {
    background: var(--bg-card-hover);
}

.hero-feature-icon {
    color: var(--accent);
    flex-shrink: 0;
}

.hero-feature strong {
    display: block;
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 2px;
}

.hero-feature span {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* --- Section Shared --- */
.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 64px;
}

.section-tag {
    display: inline-block;
    color: var(--accent);
    font-size: 0.82rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-bottom: 12px;
}

.section-header h2,
.about-content h2 {
    font-size: clamp(1.8rem, 3.5vw, 2.4rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.7;
}

/* --- About --- */
.about {
    padding: 100px 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 64px;
    align-items: center;
}

.about-content p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.8;
    font-size: 0.95rem;
}

.about-content p strong {
    color: var(--text-primary);
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.about-stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 24px;
    text-align: center;
    transition: all var(--transition);
}

.about-stat-card:hover {
    border-color: rgba(0, 212, 170, 0.2);
    transform: translateY(-4px);
    box-shadow: var(--shadow);
}

.about-stat-number {
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1;
    letter-spacing: -0.03em;
}

.about-stat-plus {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
}

.about-stat-label {
    display: block;
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-top: 6px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* --- Services --- */
.services {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px 28px;
    transition: all var(--transition);
    position: relative;
}

.service-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(0, 212, 170, 0.2);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.service-number {
    font-size: 3rem;
    font-weight: 800;
    color: rgba(0, 212, 170, 0.08);
    line-height: 1;
    margin-bottom: 8px;
    letter-spacing: -0.04em;
}

.service-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.service-card > p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: 20px;
}

.service-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.service-list li {
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding-left: 20px;
    position: relative;
}

.service-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 9px;
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
}

/* --- Why Us --- */
.why-us {
    padding: 100px 0;
}

.why-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.why-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 28px;
    text-align: center;
    transition: all var(--transition);
}

.why-card:hover {
    border-color: rgba(0, 212, 170, 0.2);
    transform: translateY(-4px);
    box-shadow: var(--shadow);
}

.why-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: var(--accent-glow);
    border-radius: 50%;
    color: var(--accent);
    margin-bottom: 20px;
}

.why-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.why-card p {
    color: var(--text-secondary);
    font-size: 0.88rem;
    line-height: 1.7;
}

/* --- Service Card Images & Badges --- */
.service-card-featured {
    border-color: rgba(0, 212, 170, 0.15);
    background: linear-gradient(135deg, var(--bg-card), rgba(0, 212, 170, 0.03));
}

.service-category-badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    background: var(--accent-glow);
    padding: 3px 10px;
    border-radius: 4px;
    margin-bottom: 8px;
}


/* --- eTrek Product Showcase --- */
.product-showcase {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.etrek-showcase {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 48px;
    align-items: start;
}

.etrek-images {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.etrek-img {
    width: 100%;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: all var(--transition);
}

.etrek-img:hover {
    border-color: rgba(0, 212, 170, 0.3);
    box-shadow: 0 8px 32px rgba(0, 212, 170, 0.1);
}

.etrek-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
    margin-bottom: 24px;
}

.etrek-features {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.etrek-features li {
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding-left: 24px;
    position: relative;
    line-height: 1.6;
}

.etrek-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 9px;
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
}

/* --- Projects Gallery --- */
.projects-gallery {
    padding: 100px 0;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.gallery-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: all var(--transition);
}

.gallery-item:hover {
    border-color: rgba(0, 212, 170, 0.2);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.gallery-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.gallery-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.gallery-item:hover .gallery-image img {
    transform: scale(1.08);
}

.gallery-overlay {
    position: absolute;
    top: 12px;
    left: 12px;
    z-index: 1;
}

.gallery-badge {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 4px 10px;
    border-radius: 4px;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.gallery-badge-product {
    color: #4a9eff;
    background: rgba(74, 158, 255, 0.2);
    border: 1px solid rgba(74, 158, 255, 0.3);
}

.gallery-badge-proto {
    color: #f0a030;
    background: rgba(240, 160, 48, 0.2);
    border: 1px solid rgba(240, 160, 48, 0.3);
}

.gallery-badge-consult {
    color: #c084fc;
    background: rgba(192, 132, 252, 0.2);
    border: 1px solid rgba(192, 132, 252, 0.3);
}

.gallery-caption {
    padding: 18px 20px;
}

.gallery-caption h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.gallery-caption p {
    color: var(--text-secondary);
    font-size: 0.82rem;
    line-height: 1.6;
}

/* --- CTA --- */
.cta {
    padding: 80px 0;
    background: linear-gradient(135deg, rgba(0, 212, 170, 0.08), rgba(74, 158, 255, 0.06));
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.cta-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta h2 {
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

.cta p {
    color: var(--text-secondary);
    margin-bottom: 28px;
    font-size: 1.05rem;
}

/* --- Contact --- */
.contact {
    padding: 100px 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: 40px;
    align-items: start;
}

.contact-cards {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: all var(--transition);
}

.contact-card:hover {
    border-color: rgba(0, 212, 170, 0.2);
}

.contact-card-icon {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-glow);
    border-radius: var(--radius-sm);
    color: var(--accent);
    flex-shrink: 0;
}

.contact-card h3 {
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.contact-card a,
.contact-card span {
    font-size: 0.95rem;
    color: var(--text-primary);
    font-weight: 500;
}

.contact-card a:hover {
    color: var(--accent);
}

/* Contact Form */
.contact-form-wrapper {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px;
}

.contact-form-wrapper h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 24px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 12px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.92rem;
    transition: all var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%235a6e8a' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
}

.form-group select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* --- Footer --- */
.footer {
    padding: 60px 0 32px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand p {
    color: var(--text-muted);
    font-size: 0.88rem;
    margin-top: 16px;
    line-height: 1.7;
    max-width: 280px;
}

.footer-nav h4,
.footer-contact h4 {
    font-size: 0.88rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.footer-nav {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-nav a {
    color: var(--text-secondary);
    font-size: 0.88rem;
}

.footer-nav a:hover {
    color: var(--accent);
}

.footer-contact {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-contact-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.footer-contact-item svg {
    color: var(--accent);
    flex-shrink: 0;
}

.footer-contact-item a {
    color: var(--text-secondary);
}

.footer-contact-item a:hover {
    color: var(--accent);
}

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid var(--border);
    text-align: center;
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.82rem;
}

/* --- Animations --- */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

.service-card.animate-on-scroll:nth-child(2) { transition-delay: 0.1s; }
.service-card.animate-on-scroll:nth-child(3) { transition-delay: 0.2s; }
.service-card.animate-on-scroll:nth-child(4) { transition-delay: 0.3s; }
.service-card.animate-on-scroll:nth-child(5) { transition-delay: 0.4s; }
.service-card.animate-on-scroll:nth-child(6) { transition-delay: 0.5s; }

.why-card.animate-on-scroll:nth-child(2) { transition-delay: 0.1s; }
.why-card.animate-on-scroll:nth-child(3) { transition-delay: 0.15s; }
.why-card.animate-on-scroll:nth-child(4) { transition-delay: 0.2s; }
.why-card.animate-on-scroll:nth-child(5) { transition-delay: 0.25s; }
.why-card.animate-on-scroll:nth-child(6) { transition-delay: 0.3s; }

.gallery-item.animate-on-scroll:nth-child(2) { transition-delay: 0.1s; }
.gallery-item.animate-on-scroll:nth-child(3) { transition-delay: 0.15s; }
.gallery-item.animate-on-scroll:nth-child(4) { transition-delay: 0.2s; }
.gallery-item.animate-on-scroll:nth-child(5) { transition-delay: 0.25s; }
.gallery-item.animate-on-scroll:nth-child(6) { transition-delay: 0.3s; }
.gallery-item.animate-on-scroll:nth-child(7) { transition-delay: 0.35s; }
.gallery-item.animate-on-scroll:nth-child(8) { transition-delay: 0.4s; }
.gallery-item.animate-on-scroll:nth-child(9) { transition-delay: 0.45s; }

/* --- Responsive --- */
@media (max-width: 1024px) {
    .services-grid,
    .why-grid,
    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .etrek-showcase {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

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

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

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
}

@media (max-width: 768px) {
    .topbar { display: none; }

    .nav-toggle { display: flex; }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--bg-secondary);
        flex-direction: column;
        padding: 80px 32px 32px;
        gap: 4px;
        transition: right var(--transition);
        border-left: 1px solid var(--border);
    }

    .nav-links.active { right: 0; }

    .nav-links a {
        padding: 12px 16px;
        font-size: 1rem;
    }

    .btn-nav { margin-top: 16px; text-align: center; }

    .hero-features {
        grid-template-columns: 1fr;
    }

    .services-grid,
    .why-grid,
    .gallery-grid {
        grid-template-columns: 1fr;
    }

    .about-stats {
        grid-template-columns: 1fr 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .about,
    .services,
    .why-us,
    .product-showcase,
    .projects-gallery,
    .contact {
        padding: 80px 0;
    }

    .cta {
        padding: 60px 0;
    }

    .section-header {
        margin-bottom: 48px;
    }

    .hero-actions {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .hero h1 { font-size: 1.8rem; }
    .about-stats { grid-template-columns: 1fr 1fr; gap: 12px; }
    .about-stat-number { font-size: 2.2rem; }
    .contact-form-wrapper { padding: 24px; }
    .contact-card { padding: 18px; }
}