:root {
    --background-color: #0A192F;
    --text-color: #e6f1ff;
    --header-background: #0C1E3A;
    --menu-hover-background: rgba(255, 255, 255, 0.1);
    --menu-active-color: #64ffda;
    --logo-gradient-start: #64ffda;
    --logo-gradient-end: #00bcd4;
    --button-background: #64ffda;
    --button-color: #0A192F;
    --button-hover-background: #45e6c0;
    --link-color: #64ffda;
    --link-hover-color: #45e6c0;
    --border-color: #64ffda;
    --footer-text-color: #a8b2d1;
}

html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: var(--header-background);
    padding: 1rem;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    flex-wrap: wrap;
}

.logo {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: 2px;
    text-transform: uppercase;
    background: linear-gradient(45deg, var(--logo-gradient-start), var(--logo-gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo-image {
    height: 45px;
    margin-right: 15px;
    border-radius: 8px;
    transition: transform 0.3s ease;
}

.logo-link:hover .logo-image {
    transform: scale(1.05);
}


.menu {
    list-style-type: none;
    display: flex;
    gap: 1.2rem;
    margin-left: auto;
}

.menu a {
    color: var(--link-color);
    text-decoration: none;
    font-size: 1.2rem;
    font-weight: 500;
    padding: 0.5rem 0.5rem;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

a:hover {
    color: var(--link-hover-color);
    text-decoration: none;
}

.menu a:hover {
    background-color: var(--menu-hover-background);
}

.menu a.active {
    background-color: rgba(255, 255, 255, 0.2);
    color: var(--menu-active-color);
}

.menu .has-submenu > a::after {
    content: ' ▼';
    font-size: 0.7em;
    vertical-align: middle;
}

.menu .has-submenu {
    position: relative;
}

.menu .submenu {
    display: none;
    position: absolute;
    top: 140%;
    left: 0;
    background-color: var(--header-background);
    min-width: 200px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
    border-radius: 0 0 4px 4px;
    list-style-type: none;
    padding: 0;
    margin: 0;
    transition: display 0.3s ease;
}

.menu .has-submenu .submenu {
    visibility: hidden;
    opacity: 0;
    display: block;
    transition: all 0.5s ease;
}

.menu .has-submenu:hover .submenu {
    visibility: visible;
    opacity: 1;
    transition-delay: 0.3s;
}

.menu .submenu a {
    color: var(--text-color);
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    transition: background-color 0.3s ease;
}

.menu .submenu a:hover {
    background-color: var(--background-color);
}

main {
    padding: 2rem;
    text-align: left;
    max-width: 900px;
    margin: 0 auto;
    flex: 1 0 auto;
    display: flex;
    flex-direction: column;
}

footer {
    background-color: var(--header-background);
    padding: 2rem 0;
    flex-shrink: 0;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.footer-menu {
    list-style-type: none;
    display: flex;
    justify-content: center;
    gap: 1.2rem;
    margin: 0 0 1.5rem 0;
    padding: 0;
}

.footer-menu a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

.footer-menu a:hover {
    color: var(--menu-active-color);
}

.footer-text {
    font-size: 0.9rem;
    text-align: center;
    color: var(--footer-text-color);
    line-height: 1.6;
    margin: 0;
}

.footer-text a {
    color: var(--link-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-text a:hover {
    color: var(--link-hover-color);
}

#theme-select {
    position: relative;
    right: -75px;
    padding: 0.5rem;
    border-radius: 4px;
    background: var(--header-background);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: right 0.3s ease; 
}

.mobile-theme-selector {
    margin: 1rem 0;
}

.mobile-theme-selector select {
    width: 100%;
    padding: 0.8rem;
    border-radius: 4px;
    background: var(--header-background);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    cursor: pointer;
}

.theme-hint {
    position: relative;
    display: inline-flex;
    align-items: center;
    --hint-opacity: 1;
}

.theme-hint::after {
    opacity: var(--hint-opacity);
    transition: opacity 0.5s ease;
    content: "⟵ Don't like the theme?\A ⟵ Change it here";
    position: absolute;
    left: 100%;
    margin-left: 80px;
    white-space: pre;
    margin-top: 2px;
    color: var(--menu-active-color);
    font-size: 0.9rem;
    font-weight: 600;
    line-height: 1.6;
    letter-spacing: 0.03em;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    font-family: 'Inter', sans-serif;
    transform: translateY(-2px);
}

@keyframes flash {
    0%, 100% { opacity: 0.95; }
    50% { opacity: 0.5; }
}

.flash-animation::after {
    animation: flash 1s ease-in-out infinite;
}

.empty-hint::after {
    content: "" !important;
}

.standard-container {
    background: var(--header-background);
    border-radius: 8px;
    padding: 2rem;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    box-sizing: border-box; 
}

.standard-container section {
    margin-bottom: 2rem;
}

.standard-container h1 {
    color: var(--menu-active-color);
    margin-bottom: 1rem;
}

.standard-container h2 {
    color: var(--menu-active-color);
    margin: 1.5rem 0 1rem 0;
}

.standard-container ul {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.standard-container li {
    margin-bottom: 0.5rem;
}

main a, 
.standard-container a {
    color: var(--link-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

main a:hover,
.standard-container a:hover {
    color: var(--link-hover-color);
    text-decoration: none;
}

.social-menu {
    list-style-type: none;
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin: 1.5rem 0;
    padding: 0;
}

.social-menu a {
    color: var(--text-color);
    font-size: 1.5rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--background-color);
}

.social-menu a:hover {
    color: var(--menu-active-color);
    transform: translateY(-3px);
    background: var(--header-background);
}

.button-group {
    display: flex;
    gap: 1.5rem;
    margin-top: 2rem;
}

.primary-button {
    display: inline-block;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--button-color);
    background: var(--button-background);
    border: none;
    border-radius: 4px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.primary-button:hover {
    background: var(--button-hover-background);
    transform: translateY(-2px);
}