:root {
    --brand-blue: #00BFFF;
    --brand-dark: #111827;
    --brand-light-dark: #1F2937;
    --text-light: #E5E7EB; /* gray-200 */
    --text-medium: #9CA3AF; /* gray-400 */
    --text-white: #FFFFFF;
    --whatsapp-green: #25D366;
    --whatsapp-green-hover: #128C7E;
    --telegram-blue: #0088cc;
    --telegram-blue-hover: #0077b5;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--brand-dark);
    color: var(--text-light);
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    width: 100%;
    max-width: 1280px; /* equivalent to lg breakpoint */
    margin-left: auto;
    margin-right: auto;
    padding-left: 1rem;
    padding-right: 1rem;
}

/* Utility Classes */
.hidden {
    display: none !important;
}
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border: 1px solid transparent;
    border-radius: 0.375rem;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
}

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

.btn-primary:hover {
    background-color: #00aeee; /* A slightly lighter blue */
}

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 50;
    background-color: rgba(17, 24, 39, 0.8); /* brand-dark with opacity */
    backdrop-filter: blur(4px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 5rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 900;
    letter-spacing: -0.05em;
    color: var(--text-white);
    text-decoration: none;
}

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

.main-nav {
    display: none;
}

.nav-link {
    color: var(--text-light);
    padding: 0.5rem 0.75rem;
    border-radius: 0.375rem;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.nav-link:hover {
    background-color: var(--brand-light-dark);
    color: var(--text-white);
}

.mobile-menu-button {
    background-color: var(--brand-light-dark);
    padding: 0.5rem;
    border-radius: 0.375rem;
    border: none;
    cursor: pointer;
}

.mobile-menu-button svg {
    height: 1.5rem;
    width: 1.5rem;
    color: var(--text-medium);
}
.mobile-menu-button .icon-close {
    display: none;
}
.mobile-menu-button.open .icon-menu {
    display: none;
}
.mobile-menu-button.open .icon-close {
    display: block;
}


.mobile-menu {
    padding: 0.5rem 0.75rem 1rem;
}
.nav-link-mobile {
    display: block;
    color: var(--text-light);
    padding: 0.75rem 1rem;
    border-radius: 0.375rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.3s ease;
}
.nav-link-mobile:hover {
    background-color: var(--brand-light-dark);
    color: var(--text-white);
}
.btn-mobile {
    margin-top: 0.5rem;
    text-align: center;
    width: 100%;
}


/* Hero Section */
.hero {
    position: relative;
    height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--text-white);
    overflow: hidden;
    background-image: url('https://picsum.photos/seed/soundboard/1920/1080');
    background-size: cover;
    background-position: center;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: black;
    opacity: 0.6;
}

.hero-content {
    position: relative;
    z-index: 10;
}

.hero-title {
    font-size: 2.25rem;
    font-weight: 800;
    letter-spacing: -0.025em;
}
.hero-title-accent {
    display: block;
    color: var(--brand-blue);
    margin-top: 0.5rem;
}

.hero-subtitle {
    margin-top: 1.5rem;
    max-width: 42rem;
    margin-left: auto;
    margin-right: auto;
    font-size: 1.125rem;
    color: var(--text-light);
}

.btn-hero {
    margin-top: 2.5rem;
    padding: 1rem 2rem;
    font-size: 1.125rem;
}
.btn-hero:hover {
    transform: scale(1.05);
}

/* Sections */
.section {
    padding-top: 5rem;
    padding-bottom: 5rem;
}

.bg-dark {
    background-color: var(--brand-dark);
}
.bg-light-dark {
    background-color: var(--brand-light-dark);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}
.section-title {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--text-white);
}
.section-subtitle {
    margin-top: 1rem;
    font-size: 1.125rem;
    color: var(--text-medium);
    max-width: 42rem;
    margin-left: auto;
    margin-right: auto;
}

/* Services Section */
.services-grid {
    display: grid;
    gap: 2rem;
}

.service-card {
    background-color: var(--brand-dark);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
    text-align: center;
}
.service-card:hover {
    transform: translateY(-0.5rem);
}

.service-icon-wrapper {
    margin-left: auto;
    margin-right: auto;
    height: 4rem;
    width: 4rem;
    border-radius: 9999px;
    background-color: var(--brand-light-dark);
    display: flex;
    align-items: center;
    justify-content: center;
}
.service-icon {
    height: 3rem;
    width: 3rem;
    color: var(--brand-blue);
}

.service-title {
    margin-top: 1.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-white);
}

.service-description {
    margin-top: 0.5rem;
    color: var(--text-medium);
}

/* Benefits Section */
.benefits-grid {
    display: grid;
    gap: 2.5rem;
}

.benefit-item {
    display: flex;
    align-items: flex-start;
}

.benefit-icon-wrapper {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 3rem;
    width: 3rem;
    border-radius: 0.375rem;
    background-color: var(--brand-light-dark);
}

.benefit-icon {
    height: 2.5rem;
    width: 2.5rem;
    color: var(--brand-blue);
}

.benefit-content {
    margin-left: 1rem;
}
.benefit-title {
    font-size: 1.125rem;
    line-height: 1.5rem;
    font-weight: 700;
    color: var(--text-white);
}
.benefit-description {
    margin-top: 0.5rem;
    color: var(--text-medium);
}

/* Brands Section */
.brands-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    max-width: 48rem;
    margin-left: auto;
    margin-right: auto;
}

.brand-item {
    background-color: var(--brand-dark);
    padding: 1rem 1.5rem;
    border-radius: 0.5rem;
    text-align: center;
    font-weight: 600;
    color: var(--text-medium);
    transition: all 0.3s ease;
    border: 1px solid var(--brand-light-dark);
}

.brand-item:hover {
    color: var(--text-white);
    border-color: var(--brand-blue);
    transform: translateY(-4px);
    box-shadow: 0 4px 6px -1px rgba(0, 191, 255, 0.1), 0 2px 4px -2px rgba(0, 191, 255, 0.1);
}

/* FAQ Section */
.faq-container {
    max-width: 48rem;
    margin: 0 auto;
    background-color: var(--brand-light-dark);
    border-radius: 0.5rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
}
.faq-item {
    border-bottom: 1px solid #374151; /* gray-700 */
}
.faq-item:last-child {
    border-bottom: none;
}
.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-align: left;
    padding: 1.5rem 1rem;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--text-white);
}
.faq-question:hover {
    background-color: var(--brand-dark);
}
.faq-icon {
    width: 1.5rem;
    height: 1.5rem;
    color: var(--brand-blue);
    transition: transform 0.3s ease;
}
.faq-item.open .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease-in-out;
}
.faq-item.open .faq-answer {
    max-height: 20rem; /* Adjust as needed */
}

.faq-answer p {
    padding: 0 1rem 1rem;
    color: var(--text-medium);
}

/* CTA Section */
.section-cta {
    padding-top: 5rem;
    padding-bottom: 5rem;
}
.cta-container {
    text-align: center;
}
.contact-info {
    color: var(--text-light);
    margin-bottom: 2rem;
}
.contact-info p {
    margin-bottom: 0.5rem;
    font-size: 1.125rem;
    line-height: 1.75rem;
}
.contact-info a {
    color: var(--brand-blue);
    text-decoration: none;
    font-weight: 600;
}
.contact-info a:hover {
    text-decoration: underline;
}
.cta-buttons {
    margin-top: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}
.btn-whatsapp {
    background-color: var(--whatsapp-green);
    color: var(--text-white);
    width: 100%;
}
.btn-whatsapp:hover {
    background-color: var(--whatsapp-green-hover);
}
.btn-telegram {
    background-color: var(--telegram-blue);
    color: var(--text-white);
    width: 100%;
}
.btn-telegram:hover {
    background-color: var(--telegram-blue-hover);
}
.btn-icon {
    height: 1.5rem;
    width: 1.5rem;
    margin-right: 0.75rem;
}

/* Footer */
.footer {
    background-color: var(--brand-dark);
    padding: 3rem 0;
    border-top: 1px solid var(--brand-light-dark);
}
.footer-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 2rem;
}
.footer-logo {
    font-size: 1.5rem;
    font-weight: 900;
    letter-spacing: -0.05em;
    color: var(--text-white);
    margin-bottom: 1rem;
}
.footer-info p, .footer-info a {
    color: var(--text-medium);
    text-decoration: none;
    margin-bottom: 0.5rem;
    display: block;
}
.footer-info a:hover {
    color: var(--brand-blue);
}
.footer-copyright {
    color: #6B7280; /* gray-500 */
    font-size: 0.875rem;
}

/* Responsive Styles */

/* Small devices (sm, 640px and up) */
@media (min-width: 640px) {
    .container {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }
    .hero-title {
        font-size: 3rem;
    }
    .hero-subtitle {
        font-size: 1.25rem;
    }
    .section-title {
        font-size: 2.5rem;
    }
    .services-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .brands-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .cta-buttons {
        flex-direction: row;
        justify-content: center;
    }
    .btn-whatsapp, .btn-telegram {
        width: auto;
    }
}

/* Medium devices (md, 768px and up) */
@media (min-width: 768px) {
    .hidden-mobile {
        display: inline-flex;
    }
    .main-nav {
        display: flex;
        align-items: baseline;
        gap: 1rem;
    }
    .mobile-menu-button {
        display: none;
    }
    .hero {
        height: 80vh;
    }
    .hero-title {
        font-size: 3.75rem;
    }
    .services-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .benefits-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 2rem 3rem;
    }
    .footer-container {
        flex-direction: row;
        justify-content: space-between;
    }
    .footer-info {
        text-align: left;
    }
    .footer-copyright {
        text-align: right;
    }
}

/* Large devices (lg, 1024px and up) */
@media (min-width: 1024px) {
    .container {
        padding-left: 2rem;
        padding-right: 2rem;
    }
     .hero-title {
        font-size: 4.5rem;
    }
    .services-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
    .brands-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    .section-header {
      text-align: left;
    }
    .section-subtitle {
        margin-left: 0;
        margin-right: 0;
    }
    #benefits .section-header, #brands .section-header, #faq .section-header {
      text-align: center;
    }
    #benefits .section-subtitle, #brands .section-subtitle, #faq .section-subtitle {
        margin-left: auto;
        margin-right: auto;
    }
}