/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Section titles */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1a365d;
    margin-bottom: 1rem;
    text-align: center;
}

.section-subtitle {
    font-size: 1.125rem;
    color: #64748b;
    text-align: center;
    max-width: 800px;
    margin: 0 auto 3rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.btn--primary {
    background-color: #2563eb;
    color: white;
}

.btn--primary:hover {
    background-color: #1d4ed8;
    transform: translateY(-2px);
}

.btn--secondary {
    border: 2px solid #2563eb;
    color: #2563eb;
    background-color: transparent;
}

.btn--secondary:hover {
    background-color: #2563eb;
    color: white;
    transform: translateY(-2px);
}

/* Header */
.header {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header__content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo__text {
    font-size: 1.75rem;
    font-weight: 700;
    color: #2563eb;
}

.logo__subtitle {
    font-size: 0.875rem;
    color: #64748b;
    display: block;
    margin-top: -4px;
}

.nav__list {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav__item {
    position: relative;
}

.nav__link {
    text-decoration: none;
    color: #374151;
    font-weight: 500;
    transition: color 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav__link:hover {
    color: #2563eb;
}

.dropdown__menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    min-width: 220px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
    list-style: none;
    padding: 0.5rem 0;
}

.dropdown:hover .dropdown__menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown__link {
    display: block;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    color: #374151;
    font-weight: 400;
    transition: all 0.3s ease;
}

.dropdown__link:hover {
    background-color: #f8fafc;
    color: #2563eb;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    padding: 6rem 0;
}

.hero__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero__title {
    font-size: 3rem;
    font-weight: 700;
    color: #1a365d;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero__subtitle {
    font-size: 1.25rem;
    color: #64748b;
    margin-bottom: 2rem;
}

.hero__buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero__img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

/* Value Section */
.value {
    padding: 6rem 0;
    background-color: #f8fafc;
}

.value__header {
    text-align: center;
    margin-bottom: 4rem;
}

.value__content {
    display: flex;
    flex-direction: column;
    gap: 4rem;
}

.value__block {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    background: white;
    padding: 3rem;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
}

.value__block--reverse {
    grid-template-columns: 1fr 1fr;
}

.value__block--reverse .value__text {
    order: 2;
}

.value__block--reverse .value__image {
    order: 1;
}

.value__icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.value__icon i {
    font-size: 1.5rem;
    color: white;
}

.value__title {
    font-size: 1.75rem;
    font-weight: 600;
    color: #1a365d;
    margin-bottom: 1rem;
}

.value__description {
    font-size: 1rem;
    color: #64748b;
    margin-bottom: 1.5rem;
}

.value__list {
    list-style: none;
    padding-left: 0;
}

.value__list li {
    padding: 0.5rem 0;
    color: #374151;
    position: relative;
    padding-left: 1.5rem;
}

.value__list li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #10b981;
    font-weight: bold;
}

.value__list strong {
    color: #1a365d;
}

.value__img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.value__conclusion {
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    color: white;
    padding: 2.5rem;
    border-radius: 16px;
    text-align: center;
    margin-top: 2rem;
}

.value__summary {
    font-size: 1.125rem;
    font-weight: 500;
    line-height: 1.7;
}

/* Products Section */
.products {
    padding: 6rem 0;
    background-color: white;
}

.products__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.product-card {
    display: block;
    background: white;
    padding: 2.5rem;
    border-radius: 12px;
    border: 1px solid #e2e8f0;
    text-align: center;
    transition: all 0.3s ease;
    text-decoration: none;
    color: inherit;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    text-decoration: none;
}

.product-card__icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.product-card__icon i {
    font-size: 2rem;
    color: #2563eb;
}

.product-card__title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1a365d;
    margin-bottom: 1rem;
}

.product-card__description {
    color: #64748b;
    line-height: 1.6;
}

/* About Section */
.about {
    padding: 6rem 0;
    background-color: #f8fafc;
}

.about__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about__description {
    font-size: 1.125rem;
    color: #374151;
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.about__img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

/* Footer */
.footer {
    background-color: #1a365d;
    color: white;
    padding: 3rem 0 1rem;
}

.footer__content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer__title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #fff;
}

.footer__text {
    color: #cbd5e1;
    margin-bottom: 0.5rem;
}

.footer__list {
    list-style: none;
}

.footer__link {
    color: #cbd5e1;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer__link:hover {
    color: #fff;
}

.footer__bottom {
    border-top: 1px solid #334155;
    padding-top: 1rem;
    text-align: center;
}

.footer__copyright {
    color: #94a3b8;
}

/* Page Header */
.page-header {
    background: linear-gradient(135deg, #1a365d 0%, #2563eb 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.page-subtitle {
    font-size: 1.125rem;
    opacity: 0.9;
    max-width: 800px;
    margin: 0 auto;
}

/* QD Info Section */
.qd-info {
    padding: 3rem 0;
    background-color: #f8fafc;
}

.info-card {
    display: flex;
    align-items: flex-start;
    gap: 2rem;
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
}

.info-card__icon {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.info-card__icon i {
    font-size: 1.5rem;
    color: white;
}

.info-card__content h3 {
    color: #1a365d;
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.info-card__content p {
    color: #64748b;
    line-height: 1.6;
}

/* Catalog Section */
.catalog {
    padding: 4rem 0;
    background-color: white;
}

.product {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 3rem;
    margin-bottom: 4rem;
    padding: 2rem;
    background: #f8fafc;
    border-radius: 16px;
    border: 1px solid #e2e8f0;
}

.product:nth-child(even) {
    grid-template-columns: 1fr 300px;
}

.product:nth-child(even) .product__image {
    order: 2;
}

.product:nth-child(even) .product__content {
    order: 1;
}

.product__img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.product__title {
    font-size: 1.5rem;
    font-weight: 600;
    color: #1a365d;
    margin-bottom: 0.5rem;
}

.product__subtitle {
    font-size: 0.875rem;
    color: #2563eb;
    font-weight: 500;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.product__description {
    color: #64748b;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.specs-toggle {
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    margin-bottom: 1rem;
}

.specs-toggle:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
}

.specs-toggle i {
    transition: transform 0.3s ease;
}

.specs-toggle.active i {
    transform: rotate(180deg);
}

.specs {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background: white;
    border-radius: 8px;
    border: 1px solid #e2e8f0;
}

.specs.active {
    max-height: 1000px;
    padding: 1.5rem;
}

.specs__list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.specs__list li {
    padding: 0.5rem 0;
    border-bottom: 1px solid #f1f5f9;
    color: #374151;
}

.specs__list li:last-child {
    border-bottom: none;
}

.specs__list strong {
    color: #1a365d;
    font-weight: 600;
}

/* Technology Section */
.technology {
    padding: 4rem 0;
    background-color: #f8fafc;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.tech-card {
    background: white;
    padding: 2.5rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
    transition: transform 0.3s ease;
}

.tech-card:hover {
    transform: translateY(-5px);
}

.tech-card__icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.tech-card__icon i {
    font-size: 2rem;
    color: white;
}

.tech-card__title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1a365d;
    margin-bottom: 1rem;
}

.tech-card__description {
    color: #64748b;
    line-height: 1.6;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }
    
    .header__content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav__list {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
    
    .hero__content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
    }
    
    .hero__title {
        font-size: 2.25rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .value__block {
        grid-template-columns: 1fr;
        gap: 2rem;
        padding: 2rem;
    }
    
    .value__block--reverse {
        grid-template-columns: 1fr;
    }
    
    .value__block--reverse .value__text {
        order: 1;
    }
    
    .value__block--reverse .value__image {
        order: 2;
    }
    
    .about__content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .products__grid {
        grid-template-columns: 1fr;
    }
    
    .footer__content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .info-card {
        flex-direction: column;
        text-align: center;
    }
    
    .product {
        grid-template-columns: 1fr;
        gap: 2rem;
        margin-bottom: 3rem;
    }
    
    .product:nth-child(even) {
        grid-template-columns: 1fr;
    }
    
    .product:nth-child(even) .product__image {
        order: 1;
    }
    
    .product:nth-child(even) .product__content {
        order: 2;
    }
    
    .dropdown__menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        background: #f8fafc;
        border-radius: 0;
        margin-top: 0.5rem;
        display: none;
    }
    
    .dropdown:hover .dropdown__menu {
        display: block;
    }
}

@media (max-width: 480px) {
    .hero__title {
        font-size: 1.875rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .value__block {
        padding: 1.5rem;
    }
    
    .hero__buttons {
        flex-direction: column;
        align-items: center;
    }
}