:root {
    --primary-color: #00a0d2;
    --secondary-color: #0073aa;
    --dark-color: #1a1a2e;
    --light-color: #f8f9fa;
    --text-gray: #64748b;
    --success-color: #10b981;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Open Sans', sans-serif;
    line-height: 1.6;
    color: #333;
    background: #fff;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Raleway', sans-serif;
}

/* Header */
.site-header {
    background: linear-gradient(135deg, var(--dark-color) 0%, #16213e 100%);
    padding: 15px 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0,0,0,0.1);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo img {
    height: 40px;
    width: auto;
}

.logo-text {
    font-family: 'Raleway', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
}

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

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
}

.main-nav a {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 8px 16px;
    border-radius: 25px;
    transition: all 0.3s;
}

.main-nav a:hover {
    background: var(--primary-color);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
}

.menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background: #fff;
    margin: 5px 0;
    border-radius: 3px;
}

/* Hero Product Section */
.product-hero {
    padding: 120px 20px 80px;
    background: #fff;
}

.product-hero-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.product-gallery {
    position: sticky;
    top: 100px;
}

.product-main-image {
    width: 100%;
    border-radius: 20px;
    margin-bottom: 20px;
}

.product-main-image img {
    width: 100%;
    height: auto;
    border-radius: 20px;
}

.product-thumbnails {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.product-thumbnail {
    cursor: pointer;
    border-radius: 10px;
    overflow: hidden;
    border: 2px solid transparent;
    transition: all 0.3s;
}

.product-thumbnail:hover,
.product-thumbnail.active {
    border-color: var(--primary-color);
}

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

.product-info {
    padding-top: 20px;
}

.product-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    padding: 8px 20px;
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.product-info h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 15px;
    line-height: 1.2;
}

.product-tagline {
    font-size: 1.2rem;
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: 25px;
}

.product-description {
    color: var(--text-gray);
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 30px;
}

.product-highlights {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-bottom: 30px;
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #555;
}

.highlight-item svg {
    width: 20px;
    height: 20px;
    color: var(--success-color);
    flex-shrink: 0;
}

.product-logo {
    margin-top: 30px;
}

.product-logo img {
    height: 60px;
    width: auto;
}

/* Features Section */
.features-section {
    padding: 100px 20px;
    background: var(--light-color);
}

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

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(0,160,210,0.1);
    color: var(--primary-color);
    padding: 8px 20px;
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 15px;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--text-gray);
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 25px;
}

.feature-card {
    background: #fff;
    border-radius: 20px;
    padding: 30px 20px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.1);
}

.feature-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 20px;
}

.feature-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.feature-card h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-gray);
    line-height: 1.5;
}

/* Detail Sections */
.detail-section {
    padding: 80px 20px;
}

.detail-section:nth-child(even) {
    background: var(--light-color);
}

.detail-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.detail-container.reverse {
    direction: rtl;
}

.detail-container.reverse > * {
    direction: ltr;
}

.detail-image img {
    width: 100%;
    height: auto;
    border-radius: 20px;
}

.detail-content h3 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 20px;
}

.detail-content p {
    font-size: 1.1rem;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 15px;
}

.detail-list {
    list-style: none;
    margin-top: 20px;
}

.detail-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 12px;
    color: #555;
}

.detail-list li svg {
    width: 20px;
    height: 20px;
    color: var(--success-color);
    flex-shrink: 0;
    margin-top: 3px;
}

/* Specifications */
.specs-section {
    padding: 100px 20px;
    background: #fff;
}

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

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

.specs-image img {
    width: 100%;
    height: auto;
}

.specs-list {
    background: var(--light-color);
    border-radius: 20px;
    padding: 40px;
}

.specs-list h3 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 30px;
}

.spec-item {
    display: flex;
    justify-content: space-between;
    padding: 15px 0;
    border-bottom: 1px solid #e0e0e0;
}

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

.spec-label {
    font-weight: 600;
    color: var(--dark-color);
}

.spec-value {
    color: var(--text-gray);
}

/* CTA Section */
.cta-section {
    padding: 100px 20px;
    background: linear-gradient(135deg, var(--dark-color) 0%, #16213e 50%, var(--secondary-color) 100%);
    text-align: center;
}

.cta-container {
    max-width: 800px;
    margin: 0 auto;
}

.cta-section h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 20px;
}

.cta-section p {
    font-size: 1.2rem;
    color: rgba(255,255,255,0.9);
    margin-bottom: 30px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 15px 35px;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
    font-size: 1rem;
    border: none;
    cursor: pointer;
}

.btn svg {
    width: 18px;
    height: 18px;
}

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

.btn-white:hover {
    background: var(--light-color);
    transform: translateY(-3px);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255,255,255,0.3);
    margin-left: 15px;
}

.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    border-color: #fff;
}

/* Footer */
.site-footer {
    background: var(--dark-color);
    color: #fff;
    padding: 60px 20px 30px;
}

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

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: #fff;
}

.footer-col p {
    color: rgba(255,255,255,0.7);
    line-height: 1.8;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul a {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    transition: color 0.3s;
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

.footer-logo img {
    height: 35px;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-bottom p {
    color: rgba(255,255,255,0.5);
    font-size: 0.9rem;
}

.footer-bottom-links {
    display: flex;
    gap: 20px;
}

.footer-bottom-links a {
    color: rgba(255,255,255,0.5);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s;
}

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

/* Responsive */
@media (max-width: 1024px) {
    .product-hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .product-gallery {
        position: static;
    }

    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }

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

    .detail-container.reverse {
        direction: ltr;
    }

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

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

@media (max-width: 768px) {
    .main-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--dark-color);
        padding: 20px;
    }

    .main-nav.active {
        display: block;
    }

    .main-nav ul {
        flex-direction: column;
        gap: 10px;
    }

    .main-nav a {
        display: block;
        text-align: center;
    }

    .menu-toggle {
        display: block;
    }

    .product-hero {
        padding: 100px 20px 60px;
    }

    .product-info h1 {
        font-size: 1.8rem;
    }

    .product-tagline {
        font-size: 1rem;
    }

    .product-description {
        font-size: 1rem;
    }

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

    .product-thumbnails {
        grid-template-columns: repeat(4, 1fr);
    }

    .section-header h2 {
        font-size: 1.8rem;
    }

    .section-header p {
        font-size: 0.95rem;
    }

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

    .feature-card {
        padding: 20px 15px;
    }

    .feature-icon {
        width: 50px;
        height: 50px;
    }

    .feature-card h4 {
        font-size: 0.9rem;
    }

    .feature-card p {
        font-size: 0.8rem;
    }

    .detail-content h3 {
        font-size: 1.5rem;
    }

    .detail-content p {
        font-size: 1rem;
    }

    .specs-list {
        padding: 25px;
    }

    .specs-list h3 {
        font-size: 1.4rem;
    }

    .cta-section h2 {
        font-size: 1.8rem;
    }

    .cta-section p {
        font-size: 1rem;
    }

    .btn {
        padding: 12px 25px;
        font-size: 0.9rem;
    }

    .btn-outline {
        margin-left: 0;
        margin-top: 15px;
    }

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

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