/* BASIC-COLOR-VARIABLES! */
/* ==================================================================================================== */

/* Root CSS variables for header colors and gradients */
:root {
    --header-section-color: linear-gradient(135deg, #00040d, #00121b, #001b2e, #000d5f);
    --header-logo-span-color: linear-gradient(135deg, #2c5278, #3b5a74, #4b6c80, #3c4a5b);
    --header-navbar-color: #000d1e;
    --header-navbar-a: #fff;
    --header-navbar-a-hover: #4b6c80;
    --header-navbar-a-after: #4b6c80;
    --header-navbar-a-active: #2c5278;
    --header-navbar-menu-icon-color: #2c5278;
    --header-navbar-menu-icon-hover-color: #4b6c80;
    --header-navbar-sound-button-color: #4b6c80;
    --header-navbar-sound-button-hover-color: white;
}

/* HEADER-SECTION! */
/* ==================================================================================================== */

/* Fixed header bar with gradient background, shadow, padding, and smooth transitions */
.header-section {
    position: fixed; /* Fixed at top */
    top: 0;
    left: 0;
    width: 100%;
    background: var(--header-section-color);
    display: flex;
    justify-content: space-between; /* Space between logo and nav */
    align-items: center;
    z-index: 100; /* On top of other elements */
    padding: 1.5rem 3%;
    box-shadow: 0 0.5rem 3rem #4b6c80; /* Shadow for depth */
    transition: all 0.3s ease-in-out; /* Smooth transitions */
}

/* Sticky header style changes background and adds border */
.header-section.sticky {
    background-color: rgba(0, 0, 0, 0.9);
    border-bottom: 0.1rem solid rgba(0, 0, 0, 0.3);
}

/* HEADER-LOGO-SPAN! */
/* ==================================================================================================== */

/* Logo container with bigger font and pointer cursor */
.header-logo {
    font-size: 2.5rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
}

/* Gradient text effect on span inside logo */
.header-logo span {
    color: transparent; /* Text color hidden */
    background: var(--header-logo-span-color);
    -webkit-background-clip: text; /* Safari and Chrome */
    background-clip: text; /* Standard */
    letter-spacing: -1.5px; /* Tighten letter spacing */
}

/* HEADER-LOGO-IMG! */
/* ==================================================================================================== */

/* Logo image styling with margin, border, and transition */
.header-logo img {
    margin-right: 10px;
    border: 2px solid steelblue;
    transition: transform 0.5s ease;
}

/* On hover, rotate logo image 360deg and round corners */
.header-logo:hover img {
    transform: rotate(360deg);
    border-radius: 25px;
}

/* HEADER-NAVBAR! */
/* ==================================================================================================== */

/* Navigation bar: hidden by default, positioned below header */
.header-navbar {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    padding: 1.5rem 3%;
    background: var(--header-navbar-color);
    border-top: 0.1rem solid #4b6c80;
    box-shadow: 0 0.5rem 3rem #4b6c80;
    display: none; /* Hidden initially */
    transition: transform 0.3s ease-in-out;
}

/* Navbar active state: show flex column with padding */
.header-navbar.active {
    transform: translateY(0);
    display: flex;
    flex-direction: column;
    padding: 1rem 3%;
    height: auto;
}

/* LINKS-IN-NAVBAR! */
/* ==================================================================================================== */

/* Nav links styling: white, spaced, centered with transition */
.header-navbar a {
    color: var(--header-navbar-a);
    font-size: 1.8rem;
    margin: 1.5rem 0;
    text-align: center;
    transition: all 0.3s ease;
    position: relative; /* For underline pseudo */
    letter-spacing: 3px;
    word-spacing: 3px;
}

/* Link hover color */
.header-navbar a:hover {
    color: var(--header-navbar-a-hover);
}

/* Underline effect for nav links */
.header-navbar a::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--header-navbar-a-after);
    transition: width 0.3s;
}

/* Active nav link color */
.header-navbar a.active {
    color: var(--header-navbar-a-active);
}

/* LINES-BELOW-LINKS-IN-NAVBAR! */
/* ==================================================================================================== */

/* Underline expands on hover and active */
.header-navbar a:hover::after,
.header-navbar a.active::after {
    width: 100%;
}

/* HEADER-NAVBAR-MENU-ICON! */
/* ==================================================================================================== */

/* Menu icon large size, color and pointer */
#header-navbar-menu-icon {
    font-size: 4rem;
    color: var(--header-navbar-menu-icon-color);
    cursor: pointer;
    transition: all 0.3s ease;
}

/* Menu icon hover color change */
#header-navbar-menu-icon:hover {
    color: var(--header-navbar-menu-icon-hover-color);
}

/* TABLET-SCREENS-UP-TO-1024-PIXELS! */
/* ==================================================================================================== */

/* Adjust logo and navbar font sizes for tablet screens */
@media (max-width: 1024px) {
    .logo {
        font-size: 2rem;
    }

    .navbar a {
        font-size: 1.6rem;
        margin: 1rem 0;
    }

    #menu-icon {
        font-size: 3rem;
    }
}

/* MOBILE-PHONE-SCREENS-UP-TO-768-PIXELS! */
/* ==================================================================================================== */

/* Further font and padding adjustments for mobile */
@media (max-width: 768px) {
    .navbar {
        padding: 1rem 2%;
    }

    .navbar a {
        font-size: 1.6rem;
        margin: 1.5rem 0;
    }

    #menu-icon {
        font-size: 2.8rem;
    }

    .header {
        padding: 1rem 2%;
    }
}

/* МOBILE-PHONE-SCREENS-UP-TO-480-PIXELS! */
/* ==================================================================================================== */

/* Smallest font sizes and margins for smallest screens */
@media (max-width: 480px) {
    .navbar a {
        font-size: 1.4rem;
        margin: 1rem 0;
    }

    .logo {
        font-size: 1.8rem;
    }

    #menu-icon {
        font-size: 2.5rem;
    }
}

/* SOUND-BUTTON! */
/* ==================================================================================================== */

/* Sound toggle button styling with color and rounded corners */
.nav-sound-btn {
    background-color: var(--header-section-color);
    color: var(--header-navbar-sound-button-color);
    border-radius: 10px;
    font-size: 15px;
    margin-left: auto; /* Push to right */
    padding-right: 30px;
}

/* Sound button hover color */
.nav-sound-btn:hover {
    color: var(--header-navbar-sound-button-hover-color);
}

/* Sound button responsive adjustments for smaller widths */
@media (max-width: 748px) {
    .nav-sound-btn {
        padding: 0.4em;
        width: 40px;
        justify-content: center;
    }
    .nav-sound-btn .btn-text {
        display: none; /* Hide text on small */
    }
}

/* ==================================================================================================== */