/* ==========================================
   YNYB Robot - Global Styles
   Professional B2B Website Stylesheet
   ========================================== */

/* CSS Variables */
:root {
    --primary-color: #0066cc;
    --primary-dark: #004c99;
    --secondary-color: #ff6600;
    --accent-color: #00cc66;
    --text-dark: #1a1a2e;
    --text-gray: #666666;
    --text-light: #999999;
    --bg-light: #f5f7fa;
    --bg-white: #ffffff;
    --border-color: #e0e6ed;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.16);
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --max-width: 1200px;
    --header-height: 80px;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
    -webkit-font-smoothing: antialiased;
}

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

a:hover {
    color: var(--primary-dark);
}

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

ul, ol {
    list-style: none;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-dark);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

.section-title {
    text-align: center;
    margin-bottom: 48px;
}

.section-title h2 {
    margin-bottom: 16px;
}

.section-title p {
    color: var(--text-gray);
    max-width: 600px;
    margin: 0 auto;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    transition: all var(--transition-normal);
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background: #e55a00;
    transform: translateY(-2px);
}

.btn-outline {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
}

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

.btn-large {
    padding: 18px 40px;
    font-size: 1.1rem;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-dark);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 10px 16px;
    font-weight: 500;
    color: var(--text-dark);
    border-radius: 6px;
    transition: all var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
    color: var(--primary-color);
    background: rgba(0, 102, 204, 0.08);
}

.nav-cta {
    margin-left: 16px;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    transition: all var(--transition-fast);
}

/* Hero Section */
.hero {
    padding: 160px 0 100px;
    background: linear-gradient(135deg, #f0f7ff 0%, #e8f4ff 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(0, 102, 204, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-text h1 {
    font-size: 3rem;
    margin-bottom: 24px;
    line-height: 1.2;
}

.hero-text h1 span {
    color: var(--primary-color);
}

.hero-text p {
    font-size: 1.2rem;
    color: var(--text-gray);
    margin-bottom: 32px;
}

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

.hero-visual {
    position: relative;
}

.hero-image {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    aspect-ratio: 1;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 4rem;
    box-shadow: var(--shadow-lg);
}

.hero-badge {
    position: absolute;
    background: white;
    padding: 16px 24px;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: 12px;
}

.hero-badge-1 {
    top: 20%;
    left: -20px;
}

.hero-badge-2 {
    bottom: 20%;
    right: -20px;
}

.badge-icon {
    width: 48px;
    height: 48px;
    background: var(--bg-light);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.badge-text strong {
    display: block;
    font-size: 1.25rem;
}

.badge-text span {
    color: var(--text-gray);
    font-size: 0.875rem;
}

/* Stats Section */
.stats-section {
    padding: 60px 0;
    background: var(--bg-white);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.stat-item {
    text-align: center;
    padding: 24px;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    color: var(--text-gray);
    font-size: 1rem;
}

/* Products Section */
.products-section {
    padding: 100px 0;
    background: var(--bg-light);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.product-card {
    background: var(--bg-white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.product-image {
    height: 200px;
    background: linear-gradient(135deg, #e8f4ff, #d0e8ff);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
}

.product-content {
    padding: 24px;
}

.product-content h3 {
    margin-bottom: 12px;
    font-size: 1.25rem;
}

.product-content p {
    color: var(--text-gray);
    font-size: 0.95rem;
    margin-bottom: 16px;
}

.product-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.product-feature {
    background: var(--bg-light);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    color: var(--text-gray);
}

.product-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
    color: var(--primary-color);
}

.product-link:hover {
    gap: 10px;
}

/* Features Section */
.features-section {
    padding: 100px 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 60px;
    align-items: center;
}

.feature-item {
    display: flex;
    gap: 20px;
    padding: 24px;
    border-radius: 16px;
    transition: all var(--transition-normal);
}

.feature-item:hover {
    background: var(--bg-light);
}

.feature-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-color), #0088ff);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.75rem;
    flex-shrink: 0;
}

.feature-content h4 {
    margin-bottom: 8px;
}

.feature-content p {
    color: var(--text-gray);
    font-size: 0.95rem;
}

/* Why Us Section */
.why-us-section {
    padding: 100px 0;
    background: linear-gradient(135deg, #1a1a2e 0%, #2d2d44 100%);
    color: white;
}

.why-us-section .section-title h2,
.why-us-section .section-title p {
    color: white;
}

.why-us-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.why-us-card {
    text-align: center;
    padding: 40px 24px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all var(--transition-normal);
}

.why-us-card:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-4px);
}

.why-us-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    margin: 0 auto 24px;
}

.why-us-card h4 {
    color: white;
    margin-bottom: 12px;
}

.why-us-card p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
}

/* CTA Section */
.cta-section {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    text-align: center;
}

.cta-section h2 {
    color: white;
    margin-bottom: 16px;
}

.cta-section p {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto 32px;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.cta-section .btn-primary {
    background: white;
    color: var(--primary-color);
}

.cta-section .btn-primary:hover {
    background: var(--bg-light);
}

.cta-section .btn-secondary {
    background: var(--secondary-color);
}

/* Footer */
.footer {
    background: #0f0f1a;
    color: rgba(255, 255, 255, 0.7);
    padding: 80px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-brand p {
    margin-top: 16px;
    font-size: 0.95rem;
    line-height: 1.8;
}

.footer-title {
    color: white;
    font-size: 1.1rem;
    margin-bottom: 24px;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: white;
}

.footer-contact li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-contact span {
    flex-shrink: 0;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-bottom p {
    font-size: 0.9rem;
}

/* Page Header */
.page-header {
    padding: 140px 0 60px;
    background: linear-gradient(135deg, #f0f7ff 0%, #e8f4ff 100%);
    text-align: center;
}

.breadcrumb {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 24px;
    font-size: 0.9rem;
}

.breadcrumb a {
    color: var(--text-gray);
}

.breadcrumb span {
    color: var(--text-light);
}

/* Product Page */
.product-hero {
    padding: 140px 0 60px;
    background: linear-gradient(135deg, #f0f7ff 0%, #e8f4ff 100%);
}

.product-hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.product-gallery {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.product-main-image {
    width: 100%;
    aspect-ratio: 4/3;
    background: white;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 6rem;
    box-shadow: var(--shadow-md);
}

.product-info h1 {
    margin-bottom: 16px;
}

.product-info .product-subtitle {
    font-size: 1.2rem;
    color: var(--text-gray);
    margin-bottom: 24px;
}

.product-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 32px;
}

.product-tag {
    background: var(--bg-light);
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.product-cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* Specs Section */
.specs-section {
    padding: 80px 0;
}

.specs-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.spec-item {
    background: var(--bg-light);
    padding: 24px;
    border-radius: 12px;
    text-align: center;
}

.spec-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 4px;
}

.spec-label {
    color: var(--text-gray);
    font-size: 0.9rem;
}

.specs-table-section {
    margin-top: 60px;
}

.specs-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.specs-table th,
.specs-table td {
    padding: 16px 24px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.specs-table th {
    background: var(--bg-light);
    font-weight: 600;
    width: 40%;
}

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

/* Features Detail */
.features-detail-section {
    padding: 80px 0;
    background: var(--bg-light);
}

.features-detail-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.feature-detail-card {
    background: var(--bg-white);
    padding: 32px;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
}

.feature-detail-card h4 {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.feature-icon-sm {
    width: 48px;
    height: 48px;
    background: var(--bg-light);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.feature-detail-card ul {
    padding-left: 20px;
}

.feature-detail-card li {
    margin-bottom: 8px;
    color: var(--text-gray);
    list-style: disc;
}

/* Applications Section */
.applications-section {
    padding: 80px 0;
}

.applications-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.application-card {
    background: var(--bg-light);
    padding: 32px;
    border-radius: 16px;
    text-align: center;
    transition: all var(--transition-normal);
}

.application-card:hover {
    background: var(--bg-white);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.application-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    margin: 0 auto 20px;
}

.application-card h4 {
    margin-bottom: 12px;
}

.application-card p {
    color: var(--text-gray);
    font-size: 0.95rem;
}

/* ROI Section */
.roi-section {
    padding: 80px 0;
    background: linear-gradient(135deg, #1a1a2e 0%, #2d2d44 100%);
    color: white;
}

.roi-section h2 {
    color: white;
}

.roi-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 60px;
    align-items: center;
}

.roi-highlight {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    padding: 40px;
    border-radius: 16px;
    text-align: center;
}

.roi-highlight .savings {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.roi-highlight .subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
}

.roi-table {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    overflow: hidden;
}

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

.roi-table th,
.roi-table td {
    padding: 16px 24px;
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.roi-table th {
    background: rgba(255, 255, 255, 0.1);
    font-weight: 600;
}

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

/* Contact Form */
.contact-section {
    padding: 80px 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-form {
    background: var(--bg-light);
    padding: 40px;
    border-radius: 16px;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.contact-info h3 {
    margin-bottom: 24px;
}

.contact-info-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 24px;
}

.contact-icon {
    width: 48px;
    height: 48px;
    background: var(--bg-light);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.contact-info-item h4 {
    margin-bottom: 4px;
}

.contact-info-item p {
    color: var(--text-gray);
}

/* FAQ Section */
.faq-section {
    padding: 80px 0;
    background: var(--bg-light);
}

.faq-categories {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 48px;
}

.faq-category {
    padding: 10px 20px;
    background: var(--bg-white);
    border-radius: 24px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.faq-category:hover,
.faq-category.active {
    background: var(--primary-color);
    color: white;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-white);
    border-radius: 12px;
    margin-bottom: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.faq-question {
    padding: 20px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 600;
}

.faq-question:hover {
    color: var(--primary-color);
}

.faq-toggle {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-fast);
}

.faq-item.active .faq-toggle {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 24px;
    max-height: 0;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.faq-item.active .faq-answer {
    padding: 0 24px 20px;
    max-height: 500px;
}

.faq-answer p {
    color: var(--text-gray);
    line-height: 1.8;
}

/* About Page */
.about-content {
    padding: 80px 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 80px;
}

.about-text h2 {
    margin-bottom: 24px;
}

.about-text p {
    color: var(--text-gray);
    margin-bottom: 16px;
    line-height: 1.8;
}

.about-image {
    aspect-ratio: 4/3;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 6rem;
    color: white;
}

.timeline-section {
    padding: 80px 0;
    background: var(--bg-light);
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 100%;
    background: var(--primary-color);
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    margin-bottom: 48px;
    display: flex;
}

.timeline-item:nth-child(odd) {
    justify-content: flex-start;
    padding-right: calc(50% + 30px);
}

.timeline-item:nth-child(even) {
    justify-content: flex-end;
    padding-left: calc(50% + 30px);
}

.timeline-dot {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    border: 4px solid white;
    box-shadow: var(--shadow-sm);
}

.timeline-content {
    background: var(--bg-white);
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
}

.timeline-year {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.timeline-content h4 {
    margin-bottom: 8px;
}

.timeline-content p {
    color: var(--text-gray);
    font-size: 0.95rem;
}

/* Certifications */
.certifications-section {
    padding: 80px 0;
}

.certifications-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.certification-card {
    background: var(--bg-light);
    padding: 32px;
    border-radius: 16px;
    text-align: center;
    transition: all var(--transition-normal);
}

.certification-card:hover {
    background: var(--bg-white);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.certification-icon {
    width: 64px;
    height: 64px;
    background: var(--primary-color);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    margin: 0 auto 16px;
}

.certification-card h4 {
    margin-bottom: 8px;
}

.certification-card p {
    color: var(--text-gray);
    font-size: 0.9rem;
}

/* Video Section */
.video-section {
    padding: 80px 0;
    background: var(--bg-light);
}

.video-placeholder {
    aspect-ratio: 16/9;
    max-width: 900px;
    margin: 0 auto;
    background: var(--text-dark);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.video-placeholder::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.3);
}

.play-button {
    width: 80px;
    height: 80px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
    z-index: 1;
    transition: all var(--transition-normal);
}

.video-placeholder:hover .play-button {
    transform: scale(1.1);
    background: var(--primary-dark);
}

/* Responsive */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-text h1 {
        font-size: 2.5rem;
    }

    .hero-buttons {
        justify-content: center;
    }

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

    .stats-grid,
    .why-us-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .product-hero-content,
    .contact-grid,
    .roi-grid,
    .about-grid {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 768px) {
    :root {
        --header-height: 70px;
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.25rem; }

    .nav-menu {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero {
        padding: 120px 0 60px;
    }

    .hero-text h1 {
        font-size: 2rem;
    }

    .products-grid,
    .features-detail-grid,
    .applications-grid,
    .stats-grid,
    .why-us-grid,
    .certifications-grid {
        grid-template-columns: 1fr;
    }

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

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        padding-left: 50px !important;
        padding-right: 0 !important;
        justify-content: flex-start !important;
    }

    .timeline-dot {
        left: 20px;
    }
}