:root {

    /* Základní barvy */

    --primary-color: #6eadff; /* RGB: 110, 173, 255 - modrá */

    --primary-dark: #3a85e0;

    --primary-light: #9dc4ff;

    --primary-lighter: #e6f0ff;

    

    /* Akcentová barva */

    --accent-color: #ff4b4b; /* RGB: 255, 75, 75 - červená */

    --accent-dark: #e03a3a;

    --accent-light: #ff8080;

    

    /* Neutrální barvy */

    --dark-color: #162447;

    --text-color: #333333;

    --light-color: #f5f7fa;

    --gray-color: #6c757d;

    --white-color: #ffffff;

    --black-color: #000000;

    

    /* Efekty */

    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.08);

    --shadow-md: 0 5px 20px rgba(0, 0, 0, 0.12);

    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.15);

    --shadow-hover: 0 15px 35px rgba(0, 0, 0, 0.18);

    

    /* Přechody */

    --transition-fast: all 0.2s ease;

    --transition-medium: all 0.3s ease;

    --transition-slow: all 0.5s ease;

    

    /* Border radius */

    --border-radius-sm: 4px;

    --border-radius-md: 8px;

    --border-radius-lg: 12px;

    --border-radius-xl: 20px;

    --border-radius-full: 50%;

    

    /* Layout */

    --container-width: 1200px;

    --header-height: 80px;

    --gutter: 30px;

    

    /* Typografie */

    --font-family: 'Montserrat', sans-serif;

    --font-size-base: 16px;

    --font-weight-light: 300;

    --font-weight-regular: 400;

    --font-weight-medium: 500;

    --font-weight-semibold: 600;

    --font-weight-bold: 700;

    

    /* Z-index */

    --z-back: -10;

    --z-normal: 1;

    --z-tooltip: 10;

    --z-fixed: 100;

    --z-modal: 1000;

}



* {

    margin: 0;

    padding: 0;

    box-sizing: border-box;

}



html {

    font-size: var(--font-size-base);

    scroll-behavior: smooth;

}



body {

    font-family: var(--font-family);

    font-weight: var(--font-weight-regular);

    line-height: 1.6;

    color: var(--text-color);

    background-color: var(--white-color);

    overflow-x: hidden;

}



a {

    text-decoration: none;

    color: var(--primary-color);

    transition: var(--transition-medium);

}



a:hover {

    color: var(--primary-dark);

}



ul {

    list-style: none;

}



img {

    max-width: 100%;

    height: auto;

    display: block;

}



.container {

    width: 100%;

    max-width: var(--container-width);

    margin: 0 auto;

    padding: 0 var(--gutter);

}



.section-heading {

    text-align: center;

    margin-bottom: 50px;

}



.section-heading h2 {

    font-size: 2.5rem;

    font-weight: var(--font-weight-bold);

    color: var(--dark-color);

    margin-bottom: 20px;

    position: relative;

}



.separator {

    width: 80px;

    height: 4px;

    background: linear-gradient(to right, var(--primary-color), var(--accent-color));

    margin: 0 auto;

    border-radius: var(--border-radius-full);

}



.bg-light {

    background-color: var(--light-color);

}



/* Buttons */

.btn {

    display: inline-block;

    padding: 12px 30px;

    font-size: 1rem;

    font-weight: var(--font-weight-medium);

    text-align: center;

    border-radius: var(--border-radius-md);

    transition: var(--transition-medium);

    cursor: pointer;

    text-transform: uppercase;

    letter-spacing: 1px;

    position: relative;

    overflow: hidden;

}



.btn::after {

    content: '';

    position: absolute;

    width: 100%;

    height: 100%;

    top: 0;

    left: 0;

    background: rgba(255, 255, 255, 0.2);

    transform: scale(0, 0);

    transition: var(--transition-medium);

    border-radius: 100%;

}



.btn:hover::after {

    transform: scale(2, 2);

    opacity: 0;

}



.primary-btn {

    background-color: var(--primary-color);

    color: var(--white-color);

    border: 2px solid var(--primary-color);

}



.primary-btn:hover {

    background-color: var(--primary-dark);

    color: var(--white-color);

    border-color: var(--primary-dark);

    transform: translateY(-3px);

    box-shadow: var(--shadow-md);

}



.secondary-btn {

    background-color: var(--accent-color);

    color: var(--white-color);

    border: 2px solid var(--accent-color);

}



.secondary-btn:hover {

    background-color: var(--accent-dark);

    color: var(--white-color);

    border-color: var(--accent-dark);

    transform: translateY(-3px);

    box-shadow: var(--shadow-md);

}



.outline-btn {

    background-color: transparent;

    color: var(--primary-color);

    border: 2px solid var(--primary-color);

}



.outline-btn:hover {

    background-color: var(--primary-color);

    color: var(--white-color);

    transform: translateY(-3px);

    box-shadow: var(--shadow-md);

}



/* Header and Navigation */

header {

    position: fixed;

    top: 0;

    left: 0;

    width: 100%;

    z-index: var(--z-fixed);

    background-color: var(--white-color);

    box-shadow: var(--shadow-sm);

    transition: var(--transition-medium);

    height: var(--header-height);

}



header.scrolled {

    height: 60px;

    box-shadow: var(--shadow-md);

}



header .container {

    display: flex;

    justify-content: space-between;

    align-items: center;

    height: 100%;

}



.logo a {

    display: block;

}



.logo h1 {

    font-size: 1.8rem;

    font-weight: var(--font-weight-bold);

    color: var(--primary-color);

    transition: var(--transition-medium);

}



nav {

    display: flex;

    align-items: center;

}



.nav-menu {

    display: flex;

    align-items: center;

}



.nav-menu li {

    margin-left: 40px;

    position: relative;

}



.nav-menu li a {

    color: var(--dark-color);

    font-weight: var(--font-weight-medium);

    font-size: 1rem;

    position: relative;

    padding: 5px 0;

}



.nav-menu li a::after {

    content: '';

    position: absolute;

    bottom: -2px;

    left: 0;

    width: 0;

    height: 2px;

    background: linear-gradient(to right, var(--primary-color), var(--accent-color));

    transition: var(--transition-medium);

}



.nav-menu li a:hover {

    color: var(--primary-color);

}



.nav-menu li a:hover::after,

.nav-menu li a.active::after {

    width: 100%;

}



.hamburger {

    display: none;

    cursor: pointer;

    z-index: 10;

}



.bar {

    display: block;

    width: 25px;

    height: 3px;

    margin: 5px auto;

    background-color: var(--dark-color);

    transition: var(--transition-medium);

}



/* Hero Section */

.hero {

    width: 100%;

    min-height: 100vh;

    padding-top: var(--header-height);

    display: flex;

    align-items: center;

    background: linear-gradient(to right, var(--primary-lighter) 50%, var(--white-color) 50%);

}



.hero-content {

    flex: 1;

    padding-right: 50px;

}



.hero-content h1 {

    font-size: 3.5rem;

    font-weight: var(--font-weight-bold);

    line-height: 1.2;

    margin-bottom: 25px;

    color: var(--dark-color);

}



.hero-content p {

    font-size: 1.25rem;

    margin-bottom: 40px;

    color: var(--gray-color);

    max-width: 500px;

}



.hero-buttons {

    display: flex;

    gap: 20px;

}



.hero-image {

    flex: 1;

    position: relative;

}



.image-container {

    position: relative;

    border-radius: var(--border-radius-md);

    overflow: hidden;

    box-shadow: var(--shadow-lg);

}



.image-container::before {

    content: '';

    position: absolute;

    top: 20px;

    left: -20px;

    width: 100%;

    height: 100%;

    border: 4px solid var(--primary-color);

    border-radius: var(--border-radius-md);

    z-index: -1;

}



.image-container img {

    display: block;

    width: 100%;

    height: 500px;

    object-fit: cover;

    border-radius: var(--border-radius-md);

    transition: var(--transition-slow);

}



.image-container:hover img {

    transform: scale(1.05);

}



/* About Section */

.about-section {

    padding: 100px 0;

}



.about-content {

    display: flex;

    align-items: center;

    gap: 50px;

}



.about-image {

    flex: 1;

    position: relative;

    border-radius: var(--border-radius-md);

    overflow: hidden;

    box-shadow: var(--shadow-lg);

}



.about-image::after {

    content: '';

    position: absolute;

    bottom: -20px;

    right: -20px;

    width: 60%;

    height: 60%;

    background-color: var(--primary-light);

    z-index: -1;

    border-radius: var(--border-radius-md);

}



.about-image img {

    width: 100%;

    height: auto;

    display: block;

    border-radius: var(--border-radius-md);

    transition: var(--transition-medium);

}



.about-image:hover img {

    transform: scale(1.03);

}



.about-text {

    flex: 1;

}



.about-text h3 {

    font-size: 2rem;

    margin-bottom: 20px;

    color: var(--dark-color);

    font-weight: var(--font-weight-bold);

}



.about-text p {

    margin-bottom: 20px;

    color: var(--gray-color);

    font-size: 1.05rem;

}



/* Services Section */

.services-section {

    padding: 100px 0;

    position: relative;

    overflow: hidden;

}



.services-grid {

    display: grid;

    grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));

    gap: 30px;

}



.service-card {

    background-color: var(--white-color);

    padding: 40px 30px;

    border-radius: var(--border-radius-md);

    box-shadow: var(--shadow-sm);

    transition: var(--transition-medium);

    position: relative;

    z-index: 1;

    overflow: hidden;

}



.service-card::before {

    content: '';

    position: absolute;

    top: 0;

    left: 0;

    width: 100%;

    height: 0;

    background-color: var(--primary-lighter);

    z-index: -1;

    transition: var(--transition-medium);

}



.service-card:hover {

    transform: translateY(-10px);

    box-shadow: var(--shadow-hover);

}



.service-card:hover::before {

    height: 100%;

}



.service-icon {

    width: 70px;

    height: 70px;

    background-color: var(--primary-lighter);

    border-radius: var(--border-radius-full);

    display: flex;

    align-items: center;

    justify-content: center;

    margin-bottom: 25px;

    transition: var(--transition-medium);

}



.service-card:hover .service-icon {

    background-color: var(--white-color);

    box-shadow: var(--shadow-sm);

}



.service-icon i {

    font-size: 28px;

    color: var(--primary-color);

}



.service-card h3 {

    font-size: 1.3rem;

    margin-bottom: 15px;

    font-weight: var(--font-weight-semibold);

    color: var(--dark-color);

}



.service-card p {

    margin-bottom: 20px;

    color: var(--gray-color);

}



.service-link {

    display: inline-flex;

    align-items: center;

    color: var(--primary-color);

    font-weight: var(--font-weight-medium);

    position: relative;

}



.service-link::after {

    content: '→';

    margin-left: 5px;

    transition: var(--transition-medium);

}



.service-link:hover::after {

    margin-left: 10px;

}



/* Projects Section */

.projects-section {

    padding: 100px 0;

    position: relative;

}



.project-slider {

    margin-bottom: 40px;

    position: relative;

}



.project-slide {

    position: relative;

    overflow: hidden;

    border-radius: var(--border-radius-md);

    box-shadow: var(--shadow-md);

}



.project-image {

    height: 500px;

    position: relative;

    overflow: hidden;

}



.project-image img {

    width: 100%;

    height: 100%;

    object-fit: cover;

    transition: var(--transition-slow);

}



.project-slide:hover .project-image img {

    transform: scale(1.05);

}



.project-info {

    position: absolute;

    bottom: 0;

    left: 0;

    width: 100%;

    padding: 30px;

    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0));

    color: var(--white-color);

}



.project-info h3 {

    font-size: 1.8rem;

    margin-bottom: 10px;

}



.slider-nav {

    display: flex;

    justify-content: center;

    gap: 15px;

}



.slider-nav button {

    width: 50px;

    height: 50px;

    border-radius: var(--border-radius-full);

    background-color: var(--primary-color);

    color: var(--white-color);

    border: none;

    display: flex;

    align-items: center;

    justify-content: center;

    cursor: pointer;

    transition: var(--transition-medium);

    box-shadow: var(--shadow-sm);

}



.slider-nav button:hover {

    background-color: var(--primary-dark);

    transform: translateY(-3px);

    box-shadow: var(--shadow-md);

}



.slider-nav button i {

    font-size: 16px;

}



/* Articles Section */

.articles-section {

    padding: 100px 0;

}



.articles-grid {

    display: grid;

    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));

    gap: 30px;

    margin-bottom: 50px;

}



.article-card {

    background-color: var(--white-color);

    border-radius: var(--border-radius-md);

    overflow: hidden;

    box-shadow: var(--shadow-sm);

    transition: var(--transition-medium);

}



.article-card:hover {

    transform: translateY(-10px);

    box-shadow: var(--shadow-hover);

}



.article-image {

    height: 220px;

    overflow: hidden;

}



.article-image img {

    width: 100%;

    height: 100%;

    object-fit: cover;

    transition: var(--transition-slow);

}



.article-card:hover .article-image img {

    transform: scale(1.05);

}



.article-content {

    padding: 25px;

}



.article-date {

    display: inline-block;

    font-size: 0.9rem;

    color: var(--primary-color);

    margin-bottom: 10px;

    font-weight: var(--font-weight-medium);

}



.article-content h3 {

    font-size: 1.3rem;

    margin-bottom: 15px;

    line-height: 1.4;

    color: var(--dark-color);

}



.article-content p {

    margin-bottom: 20px;

    color: var(--gray-color);

}



.article-link {

    color: var(--primary-color);

    font-weight: var(--font-weight-medium);

    position: relative;

    display: inline-flex;

    align-items: center;

}



.article-link::after {

    content: '→';

    margin-left: 5px;

    transition: var(--transition-medium);

}



.article-link:hover::after {

    margin-left: 10px;

}



.center-btn {

    text-align: center;

}



/* Footer */

footer {

    background-color: var(--dark-color);

    color: var(--white-color);

}



.footer-top {

    padding: 80px 0 50px;

}



.footer-content {

    display: grid;

    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));

    gap: 50px;

}



.footer-logo h2 {

    font-size: 2rem;

    color: var(--primary-color);

    margin-bottom: 20px;

}



.footer-logo p {

    opacity: 0.7;

}



.footer-links h3,

.footer-contact h3 {

    font-size: 1.3rem;

    margin-bottom: 25px;

    color: var(--white-color);

    position: relative;

    padding-bottom: 15px;

}



.footer-links h3::after,

.footer-contact h3::after {

    content: '';

    position: absolute;

    bottom: 0;

    left: 0;

    width: 50px;

    height: 3px;

    background: linear-gradient(to right, var(--primary-color), var(--accent-color));

    border-radius: var(--border-radius-full);

}



.footer-links ul li {

    margin-bottom: 12px;

}



.footer-links ul li a {

    color: rgba(255, 255, 255, 0.7);

    transition: var(--transition-medium);

}



.footer-links ul li a:hover {

    color: var(--primary-color);

    padding-left: 5px;

}



.footer-contact ul li {

    margin-bottom: 15px;

    display: flex;

    align-items: center;

}



.footer-contact ul li i {

    margin-right: 15px;

    width: 20px;

    color: var(--primary-color);

}



.footer-contact ul li a {

    color: rgba(255, 255, 255, 0.7);

    transition: var(--transition-medium);

}



.footer-contact ul li a:hover {

    color: var(--primary-color);

}



.footer-bottom {

    padding: 25px 0;

    border-top: 1px solid rgba(255, 255, 255, 0.1);

    text-align: center;

}



.footer-bottom .container {

    display: flex;

    justify-content: space-between;

    align-items: center;

}



.footer-bottom p {

    font-size: 0.9rem;

    opacity: 0.7;

}



.footer-bottom a {

    color: var(--primary-color);

}



.footer-bottom a:hover {

    color: var(--accent-color);

}



/* Back to top button */

.back-to-top {

    position: fixed;

    right: 30px;

    bottom: 30px;

    width: 50px;

    height: 50px;

    background-color: var(--primary-color);

    color: var(--white-color);

    border-radius: var(--border-radius-full);

    display: flex;

    align-items: center;

    justify-content: center;

    cursor: pointer;

    box-shadow: var(--shadow-md);

    opacity: 0;

    visibility: hidden;

    transition: var(--transition-medium);

    z-index: var(--z-tooltip);

}



.back-to-top.active {

    opacity: 1;

    visibility: visible;

}



.back-to-top:hover {

    background-color: var(--primary-dark);

    transform: translateY(-3px);

}



/* Media Queries */

@media (max-width: 1024px) {

    :root {

        --header-height: 70px;

    }

    

    .hero-content h1 {

        font-size: 3rem;

    }

    

    .about-content {

        gap: 30px;

    }

}



@media (max-width: 992px) {

    .hero {

        background: var(--white-color);

        padding-top: 100px;

    }

    

    .hero .container {

        flex-direction: column;

    }

    

    .hero-content {

        text-align: center;

        padding-right: 0;

        margin-bottom: 50px;

    }

    

    .hero-content p {

        margin-left: auto;

        margin-right: auto;

    }

    

    .hero-buttons {

        justify-content: center;

    }

    

    .about-content {

        flex-direction: column;

    }

    

    .about-text {

        text-align: center;

    }

}



@media (max-width: 768px) {

    .hamburger {

        display: block;

    }

    

    .hamburger.active .bar:nth-child(2) {

        opacity: 0;

    }

    

    .hamburger.active .bar:nth-child(1) {

        transform: translateY(8px) rotate(45deg);

    }

    

    .hamburger.active .bar:nth-child(3) {

        transform: translateY(-8px) rotate(-45deg);

    }

    

    .nav-menu {

        position: fixed;

        top: -100%;

        left: 0;

        width: 100%;

        height: 100vh;

        flex-direction: column;

        background-color: var(--white-color);

        transition: var(--transition-medium);

        z-index: calc(var(--z-fixed) - 1);

        justify-content: center;

        padding-top: 50px;

        opacity: 0;

        visibility: hidden;

    }

    

    .nav-menu.active {

        top: 0;

        opacity: 1;

        visibility: visible;

    }

    

    .nav-menu li {

        margin: 20px 0;

    }

    

    .nav-menu li a {

        font-size: 1.5rem;

    }

    

    .hero-content h1 {

        font-size: 2.5rem;

    }

    

    .service-icon {

        width: 60px;

        height: 60px;

    }

    

    .service-icon i {

        font-size: 24px;

    }

    

    .footer-bottom .container {

        flex-direction: column;

        gap: 15px;

    }

}



@media (max-width: 576px) {

    .section-heading h2 {

        font-size: 2rem;

    }

    

    .hero-content h1 {

        font-size: 2rem;

    }

    

    .hero-buttons {

        flex-direction: column;

        gap: 15px;

    }

    

    .hero-buttons .btn {

        width: 100%;

    }

    

    .about-text h3 {

        font-size: 1.7rem;

    }

    

    .service-card {

        padding: 30px 20px;

    }

    

    .project-image {

        height: 350px;

    }

    

    .project-info h3 {

        font-size: 1.5rem;

    }

    

    .footer-content {

        gap: 30px;

    }

}