/* ========================================
   CSS Reset & Base Styles
======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-blue: #003d82;
    --secondary-blue: #0056b3;
    --accent-yellow: #FFD000;
    --light-blue: #E8F2FB;
    --dark-navy: #001f3f;
    --text-dark: #1a1a1a;
    --text-gray: #666666;
    --text-light: #999999;
    --white: #ffffff;
    --border-color: #e1e1e1;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

ul {
    list-style: none;
}

/* ========================================
   Container & Layout
======================================== */
.container {
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========================================
   Buttons
======================================== */
.btn-primary {
    background-color: var(--primary-blue);
    color: var(--white);
    padding: 12px 28px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.btn-secondary {
    background-color: transparent;
    color: var(--primary-blue);
    padding: 12px 28px;
    border: 2px solid var(--primary-blue);
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-secondary:hover {
    background-color: var(--primary-blue);
    color: var(--white);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 16px 36px;
    font-size: 15px;
}

.btn-icon {
    background: transparent;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-gray);
}

.btn-icon:hover {
    border-color: var(--primary-blue);
    color: var(--primary-blue);
}

/* ========================================
   Navigation
======================================== */
.navbar {
    background: var(--white);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 15px 0;
    border-bottom: 1px solid #e5e5e5;
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
    min-height: 60px;
}

.logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.logo a {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo img {
    height: 45px;
    width: auto;
    max-width: none;
    object-fit: contain;
    display: block;
    transition: transform 0.3s ease;
}

.logo img:hover {
    transform: scale(1.05);
}

.nav-menu {
    display: flex;
    gap: 35px;
    align-items: center;
    flex: 1;
    justify-content: center;
}

.nav-link {
    font-weight: 500;
    font-size: 16px;
    color: var(--text-dark);
    transition: all 0.3s ease;
    position: relative;
    padding: 8px 0;
    white-space: nowrap;
}

.nav-link:hover {
    color: var(--primary-blue);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-blue);
    transition: width 0.3s ease;
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-shrink: 0;
}

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

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary-blue);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* ========================================
   Hero Section
======================================== */
.hero {
    background: linear-gradient(135deg, #E8F2FB 0%, #ffffff 100%);
    padding: 100px 0 80px;
    position: relative;
    overflow: hidden;
}

.hero-pattern {
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background-image:
        repeating-linear-gradient(0deg, var(--border-color) 0px, var(--border-color) 1px, transparent 1px, transparent 20px),
        repeating-linear-gradient(90deg, var(--border-color) 0px, var(--border-color) 1px, transparent 1px, transparent 20px);
    opacity: 0.3;
}

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

.hero-badge {
    margin-bottom: 20px;
}

.ark-logo {
    height: 120px;
    width: auto;
    max-width: 400px;
    object-fit: contain;
    margin-bottom: 30px;
}

.hero-title {
    font-size: 64px;
    font-weight: 800;
    color: var(--primary-blue);
    line-height: 1.2;
    margin-bottom: 24px;
    letter-spacing: -2px;
    text-transform: uppercase;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-gray);
    margin-bottom: 32px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
}

.certifications {
    display: flex;
    gap: 20px;
    align-items: center;
    flex-wrap: wrap;
}

.certifications img {
    height: 60px;
    width: auto;
    filter: grayscale(100%);
    opacity: 0.6;
    transition: all 0.3s ease;
}

.certifications img:hover {
    filter: grayscale(0%);
    opacity: 1;
}

.hero-image {
    position: relative;
}

.image-decoration {
    position: absolute;
    top: -20px;
    left: -20px;
    width: 150px;
    height: 150px;
    background: var(--accent-yellow);
    border-radius: 50%;
    z-index: 0;
    opacity: 0.3;
}

.hero-image img {
    position: relative;
    z-index: 1;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
}

/* ========================================
   About Section
======================================== */
.about {
    padding: 100px 0;
    background: var(--white);
}

.about-header {
    margin-bottom: 60px;
}

.section-badge {
    position: relative;
    display: inline-block;
}

.yellow-circle {
    position: absolute;
    width: 180px;
    height: 180px;
    background: var(--accent-yellow);
    border-radius: 50%;
    z-index: 0;
    top: -40px;
    left: -40px;
}

.section-title {
    font-size: 48px;
    font-weight: 800;
    color: var(--primary-blue);
    line-height: 1.3;
    position: relative;
    z-index: 1;
    text-transform: uppercase;
}

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

.about-text p {
    margin-bottom: 20px;
    color: var(--text-gray);
    font-size: 16px;
    line-height: 1.8;
}

.mission-vision {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.mission-box,
.vision-box {
    padding: 32px;
    border-radius: 12px;
    background: var(--light-blue);
    border-left: 4px solid var(--primary-blue);
}

.mission-box h3,
.vision-box h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 12px;
    text-transform: uppercase;
}

.mission-box p,
.vision-box p {
    color: var(--text-gray);
    font-size: 15px;
    line-height: 1.7;
}

/* ========================================
   Section Headers
======================================== */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title-center {
    font-size: 42px;
    font-weight: 800;
    color: var(--primary-blue);
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-gray);
}

/* ========================================
   Products Section
======================================== */
.products {
    padding: 100px 0;
    background: linear-gradient(180deg, #ffffff 0%, #f8f9fa 100%);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.product-card {
    background: var(--white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    position: relative;
}

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

.product-card.featured {
    border: 2px solid var(--accent-yellow);
}

.product-badge {
    position: absolute;
    top: 16px;
    left: 16px;
    background: var(--primary-blue);
    color: var(--white);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    z-index: 10;
    text-transform: uppercase;
}

.product-badge.best-seller {
    background: var(--accent-yellow);
    color: var(--primary-blue);
}

.product-image {
    width: 100%;
    height: 250px;
    overflow: hidden;
    background: #f5f5f5;
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.product-card:hover .product-image img {
    transform: scale(1.1);
}

.product-info {
    padding: 24px;
}

.product-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.product-rating {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
}

.stars {
    color: var(--accent-yellow);
    font-size: 14px;
}

.rating-count {
    font-size: 13px;
    color: var(--text-light);
}

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

.spec-item {
    background: var(--light-blue);
    color: var(--primary-blue);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
}

.product-footer {
    display: flex;
    gap: 12px;
}

.product-footer .btn-primary {
    flex: 1;
}

/* ========================================
   Features Section
======================================== */
.features {
    padding: 100px 0;
    background: var(--white);
}

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

.features-image img {
    border-radius: 16px;
    box-shadow: var(--shadow-md);
}

.features-title {
    font-size: 42px;
    font-weight: 800;
    color: var(--primary-blue);
    margin-bottom: 12px;
}

.features-subtitle {
    font-size: 16px;
    color: var(--text-gray);
    margin-bottom: 32px;
}

.specs-grid {
    display: grid;
    gap: 20px;
}

.spec-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    background: var(--light-blue);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.spec-card:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-sm);
}

.spec-icon {
    flex-shrink: 0;
}

.spec-info h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 4px;
}

.spec-info p {
    font-size: 14px;
    color: var(--text-gray);
}

.features-description {
    max-width: 900px;
    margin: 0 auto;
}

.features-description p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-gray);
    margin-bottom: 20px;
}

.features-description p strong {
    color: var(--primary-blue);
}

/* ========================================
   Use Cases Section
======================================== */
.use-cases {
    padding: 100px 0;
    background: linear-gradient(180deg, #f8f9fa 0%, #ffffff 100%);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 32px;
}

.use-case-card {
    background: var(--white);
    padding: 40px 28px;
    border-radius: 16px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.use-case-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
}

.use-case-icon {
    margin: 0 auto 24px;
    width: 80px;
    height: 80px;
    background: var(--light-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.use-case-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 12px;
}

.use-case-card p {
    font-size: 15px;
    color: var(--text-gray);
    line-height: 1.7;
}

/* ========================================
   CTA Section
======================================== */
.cta {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--light-blue) 0%, var(--white) 100%);
}

.cta-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 60px;
}

.cta-text {
    position: relative;
}

.yellow-circle-large {
    position: absolute;
    width: 220px;
    height: 220px;
    background: var(--accent-yellow);
    border-radius: 50%;
    top: -60px;
    left: -60px;
    z-index: 0;
}

.cta-text h2 {
    font-size: 52px;
    font-weight: 800;
    color: var(--primary-blue);
    line-height: 1.2;
    position: relative;
    z-index: 1;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.cta-text p {
    font-size: 18px;
    color: var(--text-gray);
    position: relative;
    z-index: 1;
}

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

.terms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.terms-column {
    background: var(--white);
    padding: 32px;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
}

.terms-column h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 16px;
}

.terms-column ul {
    list-style: disc;
    padding-left: 20px;
}

.terms-column li {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 12px;
}

/* ========================================
   Footer
======================================== */
.footer {
    background: var(--dark-navy);
    color: var(--white);
    padding: 80px 0 32px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1.5fr;
    gap: 48px;
    margin-bottom: 60px;
}

.footer-logo img {
    height: 50px;
    width: auto;
    max-width: 180px;
    margin-bottom: 20px;
    filter: brightness(0) invert(1);
    object-fit: contain;
}

.footer-desc {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    line-height: 1.7;
    margin-bottom: 24px;
}

.social-links {
    display: flex;
    gap: 12px;
}

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.social-link:hover {
    background: var(--primary-blue);
    transform: translateY(-3px);
}

.footer-column h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--white);
}

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

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    transition: color 0.3s ease;
}

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

.footer-contact li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 16px;
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
}

.footer-contact svg {
    flex-shrink: 0;
    margin-top: 2px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
}

.footer-legal {
    display: flex;
    gap: 24px;
}

.footer-legal a {
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
    transition: color 0.3s ease;
}

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

/* ========================================
   Responsive Design
======================================== */

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

    .hero-image {
        order: -1;
    }

    .hero-title {
        font-size: 44px;
    }

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

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

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

    .cta-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 32px;
    }
}

/* Mobile */
@media (max-width: 768px) {
    .navbar {
        padding: 12px 0;
    }

    .nav-content {
        gap: 20px;
    }

    .logo img {
        height: 40px;
    }

    .nav-menu {
        position: fixed;
        top: 64px;
        left: -100%;
        width: 280px;
        height: calc(100vh - 64px);
        background: var(--white);
        flex-direction: column;
        padding: 32px;
        box-shadow: var(--shadow-lg);
        transition: left 0.3s ease;
        z-index: 999;
        overflow-y: auto;
    }

    .nav-menu.active {
        left: 0;
    }

    .menu-toggle {
        display: flex;
    }

    .menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }

    .nav-actions .btn-primary {
        display: none;
    }

    .hero {
        padding: 60px 0 40px;
    }

    .hero-title {
        font-size: 32px;
        line-height: 1.2;
    }

    .hero-subtitle {
        font-size: 15px;
        line-height: 1.6;
    }

    .ark-logo {
        height: 100px;
        max-width: 320px;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .hero-buttons .btn-lg {
        width: 100%;
    }

    .section-title {
        font-size: 36px;
    }

    .section-title-center {
        font-size: 32px;
    }

    .features-title {
        font-size: 32px;
    }

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

    .use-cases-grid {
        grid-template-columns: 1fr;
    }

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

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

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

    .cta-text h2 {
        font-size: 38px;
    }

    .cta-actions {
        flex-direction: column;
        width: 100%;
    }

    .cta-actions .btn-lg {
        width: 100%;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .navbar {
        padding: 10px 0;
    }

    .nav-content {
        gap: 12px;
    }

    .logo img {
        height: 36px;
    }

    .hero {
        padding: 60px 0 40px;
    }

    .hero-title {
        font-size: 26px;
        line-height: 1.3;
    }

    .hero-subtitle {
        font-size: 14px;
    }

    .ark-logo {
        height: 80px;
        max-width: 280px;
    }

    .section-title {
        font-size: 28px;
    }

    .section-title-center {
        font-size: 24px;
    }

    .certifications {
        justify-content: center;
    }

    .certifications img {
        height: 45px;
    }

    .product-title {
        font-size: 18px;
    }

    .use-case-card {
        padding: 32px 20px;
    }

    .use-case-icon {
        width: 70px;
        height: 70px;
    }

    .footer-logo img {
        height: 45px;
        max-width: 150px;
    }
}

/* Scrollbar Styling (Webkit browsers) */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: var(--primary-blue);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-blue);
}