:root {
    --orange-primary: #003366;
    --orange-light: #004488;
    --orange-accent: #F59C00;
    --white: #FFFFFF;
    --grey-light: #F9F9F9;
    --grey-dark: #333333;
    --dark-bg: #1a1a1a;
}

body {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    color: var(--grey-dark);
    line-height: 1.6;
}

/* Top Bar Styles */
.top-bar {
    background: linear-gradient(135deg, var(--orange-primary) 0%, var(--orange-light) 100%);
    padding: 10px 0;
    border-bottom: 2px solid var(--orange-accent);
}

.top-bar-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 2rem;
}

.contact-info {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 2rem;
}

.contact-item {
    color: var(--white);
    text-decoration: none;
    font-size: 18px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    font-weight: 500;
}

.contact-item:hover {
    color: var(--orange-accent);
    transform: translateY(-2px);
}

.contact-item i {
    font-size: 1rem;
}

.contact-item.whatsapp:hover {
    color: #25D366;
}

@media (max-width: 768px) {
    .contact-info {
        flex-direction: column;
        align-items: center;
        gap: 0.8rem;
    }

    .contact-item {
        font-size: 0.85rem;
    }

    .top-bar-container {
        padding: 0 1rem;
    }
}

@media (max-width: 480px) {
    .top-bar {
        padding: 8px 0;
    }

    .contact-info {
        gap: 0.5rem;
    }

    .contact-item {
        font-size: 0.8rem;
    }
}

.main-header {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1600px;
    margin: 0 auto;
    position: relative;
}

.logo a {
    color: var(--orange-primary);
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
    display: flex;
    align-items: center;
    transition: all 0.3s ease;
}

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

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    align-items: center;
    justify-content: center;
    flex: 1;
    gap: 0.2rem;
}

.nav-item {
    position: relative;
}

.nav-item a {
    color: var(--grey-dark);
    text-decoration: none;
    padding: 0.5rem 0.8rem;
    display: block;
    font-size: 16px;
    transition: all 0.3s ease;
    white-space: nowrap;
    border-bottom: 2px solid transparent;
}

.nav-item a:hover {
    color: var(--orange-primary);
    border-bottom-color: var(--orange-accent);
}

/* Submenu styles */
.submenu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--white);
    min-width: 200px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
    list-style: none;
    padding: 0.5rem 0;
}

.has-submenu:hover > .submenu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.has-submenu > a::after {
    content: '▼';
    font-size: 0.8em;
    margin-left: 0.5rem;
}

/* JS-generated arrows are visible only in mobile breakpoint styles. */
.submenu-arrow {
    display: none;
}

.submenu .submenu {
    left: 100%;
    top: 0;
}

/* Hamburger menu for mobile */
.hamburger {
    display: none;
    cursor: pointer;
    padding: 12px;
    z-index: 1002;
    background: rgba(0, 51, 102, 0.1);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.hamburger:hover {
    background: rgba(0, 51, 102, 0.15);
}

.hamburger span {
    display: block;
    width: 30px;
    height: 3.5px;
    background: var(--orange-primary);
    margin: 6px 0;
    transition: all 0.3s ease;
    border-radius: 3px;
}

.hamburger.active {
    background: rgba(0, 51, 102, 0.15);
}

.hamburger.active span {
    background: var(--orange-primary);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(9px, 9px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
    transform: translateX(-20px);
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(9px, -9px);
}

/* Responsive design */
@media (max-width: 1024px) {
    .hamburger {
        display: block;
    }

    .navbar {
        padding: 0.8rem 1.5rem;
    }

    .logo img {
        max-width: 180px;
        height: auto;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        left: -100%;
        width: 340px;
        max-width: 85%;
        height: 100vh;
        background: linear-gradient(180deg, #ffffff 0%, #f8f9fa 100%);
        flex-direction: column;
        align-items: flex-start;
        overflow-y: auto;
        overflow-x: hidden;
        transition: left 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.15);
        padding: 90px 0 30px 0;
        gap: 0;
        z-index: 1000;
    }

    /* Skrytí scrollbaru ale zachování funkčnosti */
    .nav-menu::-webkit-scrollbar {
        width: 0;
        background: transparent;
    }

    .nav-menu {
        -ms-overflow-style: none;
        scrollbar-width: none;
    }

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

    /* Overlay když je menu otevřené */
    .nav-menu-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.6);
        z-index: 999;
        opacity: 0;
        visibility: hidden;
        transition: all 0.4s ease;
    }

    .nav-menu-overlay.active {
        opacity: 1;
        visibility: visible;
    }

    .nav-item {
        width: 100%;
        margin: 0;
        border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    }

    .nav-item a {
        padding: 18px 28px;
        font-size: 1.05rem;
        font-weight: 500;
        width: 100%;
        border: none;
        display: flex;
        justify-content: space-between;
        align-items: center;
        transition: all 0.3s ease;
        position: relative;
    }

    .nav-item a:hover {
        background: rgba(0, 51, 102, 0.08);
        color: var(--orange-primary);
        border-bottom-color: transparent;
        padding-left: 32px;
    }

    /* Skrýt CSS ::after šipku na mobilu */
    .has-submenu > a::after {
        display: none;
    }

    /* Šipka pro submenu */
    .submenu-arrow {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        padding: 8px 12px;
        margin-left: 8px;
        font-size: 0.85em;
        transition: transform 0.3s ease;
        cursor: pointer;
        border-radius: 4px;
        background: rgba(0, 51, 102, 0.1);
    }

    .submenu-arrow:hover {
        background: rgba(0, 51, 102, 0.2);
    }

    .submenu-arrow.active {
        transform: rotate(180deg);
        background: rgba(0, 51, 102, 0.15);
    }

    /* Submenu na mobilu */
    .submenu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        background: #f8f9fa;
        padding: 0;
        margin: 0;
        border: none;
    }

    .submenu.active {
        max-height: 2000px;
        padding: 10px 0;
        border-top: 1px solid rgba(0, 0, 0, 0.06);
    }

    .submenu li {
        border-bottom: none;
    }

    .submenu a {
        padding: 14px 28px 14px 48px !important;
        font-size: 1.05rem !important;
        font-weight: 500 !important;
    }

    .submenu a:hover {
        padding-left: 52px !important;
    }

    .submenu .submenu {
        background: #e8eaed;
    }

    .submenu .submenu a {
        padding-left: 64px !important;
        font-size: 1.05rem !important;
    }

    .submenu .submenu a:hover {
        padding-left: 68px !important;
    }

    /* Skrýt původní ::after šipku, použijeme dynamickou */
    .has-submenu > a::after {
        display: none;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        width: 300px;
    }
}

@media (max-width: 480px) {
    .navbar {
        padding: 0.6rem 1rem;
    }

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

    .hamburger {
        padding: 10px;
    }

    .hamburger span {
        width: 28px;
        height: 3px;
    }

    .nav-menu {
        width: 280px;
    }

    .nav-item a {
        padding: 16px 24px;
        font-size: 1.05rem;
    }

    .submenu a {
        padding: 12px 24px 12px 44px !important;
        font-size: 1.05rem !important;
    }

    .submenu a:hover {
        padding-left: 48px !important;
    }

    .submenu .submenu a {
        padding-left: 60px !important;
        font-size: 1.05rem !important;
    }

    .submenu .submenu a:hover {
        padding-left: 64px !important;
    }

    .submenu-arrow {
        padding: 6px 10px;
        font-size: 0.65em;
    }
}

/* Základní styly pro větší obrazovky */
.navbar {
    padding: 0.8rem 2rem;
    max-width: 1600px;
    margin: 0 auto;
}

/* Široké obrazovky (Full HD a větší) */
@media (min-width: 1920px) {
    .navbar {
        max-width: 1800px;
        padding: 1rem 3rem;
    }

    .nav-item a {
        padding: 0.6rem 1rem;
        font-size: 16.8px;
    }

    .submenu {
        min-width: 220px;
    }
}

/* Standardní desktop (1440px - 1920px) */
@media (min-width: 1440px) and (max-width: 1919px) {
    .navbar {
        max-width: 1600px;
    }

    .nav-item a {
        font-size: 16.8px;
    }
}

/* Notebook breakpoint (1366px je běžná šířka notebooků) */
@media (max-width: 1366px) {
    .navbar {
        padding: 0.6rem 1.5rem;
    }

    .nav-item {
        margin: 0 0.3rem;
    }

    .nav-item a {
        padding: 0.4rem 0.8rem;
        font-size: 0.85rem;
    }

    .submenu {
        min-width: 180px;
    }
}

/* Menší notebooky a tablety na šířku (1024px - 1200px) */
@media (max-width: 1200px) {
    .navbar {
        padding: 0.5rem 1rem;
    }

    .nav-item a {
        padding: 0.3rem 0.6rem;
        font-size: 16.8px;
    }

    .logo img {
        width: 200px;
        height: auto;
    }

    .submenu {
        min-width: 160px;
    }
}

/* Vylepšení pro hover efekty na noteboocích */
@media (min-width: 1025px) {
    .nav-item a:hover {
        color: var(--orange-primary);
        background-color: rgba(0, 51, 102, 0.05);
        border-radius: 4px;
    }

    .submenu {
        border-radius: 4px;
        margin-top: 5px;
    }

    .has-submenu:hover > .submenu {
        transform: translateY(0);
        box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    }
}

/* Optimalizace pro různé výšky obrazovky */
@media (max-height: 800px) and (min-width: 1024px) {
    .navbar {
        padding: 0.4rem 1rem;
    }

    .nav-item a {
        padding: 0.3rem 0.6rem;
    }
}

/* Úprava hlavní hlavičky */
.main-header {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    z-index: 1000;
}

.made-by {
    margin-top: 8px;
    font-size: 0.9em;
}

.web16-link {
    color: #2196F3;
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: color 0.3s ease;
}

.web16-link:hover {
    color: #1976D2;
}

.web16-link::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    bottom: -2px;
    left: 0;
    background-color: #2196F3;
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.web16-link:hover::after {
    transform: scaleX(1);
}