/* Basic Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --color-white: #ffffff;
    --color-gray-light: #a0a0a0;
    --color-gray-dark: #333; /* Used for mobile menu background */
    --color-purple-main: rgb(0,85,255);
    --color-purple-dark: #3a387a;
    --color-purple-light-accent: #5a57a5;
    --color-header-bg: rgba(128, 128, 128, 0.103);
    --color-text-link: #ffffffa6;
    --color-transparent-white-bg: #ffffff0a;
    --color-button-secondary-bg: rgba(0, 0, 0, 0.26);
    --color-subtle-border: rgba(255, 255, 255, 0.1);

    /* Gradients/Shadows */
    --card-bg-gradient-start: rgba(28, 26, 68, 0.5);
    --card-bg-gradient-end: rgba(18, 17, 42, 0.5);
    --card-border-gradient-start: #4A468B;
    --card-border-gradient-end: #3B386C;
    --glow-color: rgb(255, 255, 255);
    --shadow-light: rgba(0, 0, 0, 0.1);
    --shadow-medium: rgba(0, 0, 0, 0.06);
    --shadow-dark: rgba(0, 0, 0, 0.3);

    /* Dimensions */
    --header-height-desktop: 75px;
    --header-height-mobile: 60px;
    --header-padding-desktop: 40px;
    --header-padding-mobile-y: 10px;
    --header-padding-mobile-x: 20px;
    --border-radius-main: 8px;
    --transition-speed: 0.3s;
    --z-index-header: 1000;
    --z-index-toggle: 1001;
    --z-index-nav-mobile: 998;
}

body {
    font-family: sans-serif;
    line-height: 1.6;
    margin: 0;
    color: var(--color-white);
    overflow-x: hidden;
    scroll-behavior: smooth;
    min-height: 300vh;
    padding-top: var(--header-height-desktop);
}

/* Main Header Styling (Desktop First) */
.main-header {
    background: var(--color-header-bg);
    height: var(--header-height-desktop);
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--header-padding-desktop);
    z-index: var(--z-index-header);
    box-shadow: 0 4px 6px -1px var(--shadow-light), 0 2px 4px -1px var(--shadow-medium);
    transition: top var(--transition-speed) ease-in-out;
    backdrop-filter: blur(8px);
}

.site-logo {
    color: var(--color-white);
    font-size: 20px;
    font-weight: 500;
    text-decoration: none;
    flex-shrink: 0;
}

/* Primary Navigation Styling (Desktop) */
.primary-nav ul {
    display: flex;
    list-style: none;
    padding: 0;
    margin: 0;
    gap: 30px;
}

.primary-nav a {
    color: var(--color-text-link);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    padding: 10px 15px;
    transition: color var(--transition-speed), font-size var(--transition-speed);
}

.primary-nav a:hover,
.primary-nav a:focus {
    color: var(--color-white);
    font-weight: 500;
    font-size: 16px;
}

/* Call to Action Button Styling (Desktop) */
.call-to-action-button {
    background: var(--color-purple-main);
    border-radius: var(--border-radius-main);
    padding: 10px 20px;
    color: rgb(241, 239, 239);
    text-align: center;
    font-size: 15px;
    font-weight: 500;
    text-decoration: none;
    position: relative;
    transition: all var(--transition-speed);
    outline: none;
}

.call-to-action-button:hover {
    box-shadow: 0 0 15px rgba(0,85,255,0.8), inset 0 0 0.55em 0 #ffffff;
                scale: 1.05;
}

/* --- Mobile Specific Elements (Hidden by default on desktop) --- */
.primary-nav .mobile-cta {
    display: none;
}

.menu-toggle {
    display: none; /* Hidden on desktop */
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    position: relative;
    z-index: var(--z-index-toggle);
    flex-shrink: 0;
}

.hamburger {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--color-white);
    margin: 5px 0;
    margin-left: 10px;
    transition: all var(--transition-speed) ease;
}

/* --- Mobile Media Query --- */
@media (max-width: 768px) {

    body {
        padding-top: var(--header-height-mobile);
    }

    .main-header {
        height: var(--header-height-mobile);
        justify-content: flex-end; /* IMPORTANT: Changed from space-between */
        flex-direction: row;
        align-items: flex-start;
        padding: var(--header-padding-mobile-y) var(--header-padding-mobile-x);
        flex-wrap: nowrap;
    }

    /* === NEW: Hide the site logo on mobile === */
    .site-logo {
        display: none;
    }
    /* ======================================= */

    .primary-nav,
    .desktop-cta {
        display: none;
    }

    .menu-toggle {
        display: block;
        margin-left: 0;
    }

    .primary-nav {
        display: block;
        position: fixed;
        top: var(--header-height-mobile);
        left: 0;
        width: 100%;
        background-color: var(--color-gray-dark);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.5s ease-out, padding 0.5s ease-out;
        box-shadow: 0 5px 10px var(--shadow-dark);
        padding-top: 0;
        padding-bottom: 0;
        z-index: var(--z-index-nav-mobile);
    }

    .primary-nav.active {
        max-height: 500px;
        padding-top: 1rem;
        padding-bottom: 1rem;
    }

    .primary-nav ul {
        flex-direction: column;
        gap: 0;
    }

    .primary-nav li {
        margin: 0;
        text-align: center;
        width: 100%;
    }

    .primary-nav a {
        display: block;
        padding: 15px 20px;
        border-bottom: 1px solid var(--color-subtle-border);
        font-size: 16px;
    }

    .primary-nav li:last-child a {
        border-bottom: none;
    }

    .primary-nav .mobile-cta {
        display: block;
    }

    .primary-nav .mobile-cta .call-to-action-button {
        display: inline-block;
        width: calc(100% - 40px);
        padding: 12px 20px;
    }

    .menu-toggle.active .hamburger:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

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

    .menu-toggle.active .hamburger:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
}