/* Root variables for consistent theming */
:root {
    --color-bg: #ffffff;
    --color-text-primary: #111827; /* Dark Gray */
    --color-text-secondary: #6b7280; /* Neutral Gray */
    --color-primary: #111827; /* Dark Gray for buttons and interactive */
    --color-primary-hover: #374151; /* Slightly lighter dark gray */
    --color-accent: #2563eb; /* Blue Accent */
    --color-accent-hover: #1d4ed8;
    --color-shadow: rgba(0, 0, 0, 0.05);
    --border-radius: 0.75rem;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width-container: 1200px;
    --spacing-large: 4rem;
    --spacing-medium: 2.5rem;
    --spacing-small: 1rem;
    --font-heading: 'Poppins', sans-serif;
    --font-body: 'Open Sans', sans-serif;
}

/* Global Reset and base */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background-color: var(--color-bg);
    color: var(--color-text-secondary);
    font-family: var(--font-body);
    line-height: 1.6;
}

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}
body.no-scroll {
    overflow: hidden;
}

/* Container for centered layout */
.container {
    max-width: var(--max-width-container);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--spacing-small);
    padding-right: var(--spacing-small);
}

/* Links */
a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition);
}

a:hover,
a:focus {
    color: var(--color-accent);
    outline: none;
}

/* Header and Navigation */
header {
    position: sticky;
    top: 0;
    background-color: var(--color-bg);
    box-shadow: 0 2px 8px var(--color-shadow);
    z-index: 1000;
}

nav.container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4.5rem;
}

/* Logo styling */
.logo {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.75rem;
    color: var(--color-primary);
    letter-spacing: -0.02em;
}
.github img {
    height: 60px;
    width: auto;
    display: block;
    transition: transform 0,3s case-in-out, filter 0.3s ease-in-out;
    cursor: pointer;
}
.dropdown li a img { 
    height: 1.2em;
    width: auto;   
    vertical-align: middle; 
    margin-right: 5px; 
}
.logo span {
    color: var(--color-accent);
    size: 200px;
    
}

/* Navigation links */
.nav-links {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 2rem;
}

.nav-item > a {
    font-weight: 600;
    font-family: var(--font-body);
    color: var(--color-primary);
    position: relative;
    padding: 0.25rem 0;
    outline-offset: 3px;
}

/* Dropdown caret icon spacing */
.nav-item > a > .fas.fa-caret-down,
.nav-item > a > .fas.fa-caret-right {
    margin-left: 0.25rem;
    font-size: 0.75rem;
    vertical-align: middle;
    transition: transform var(--transition);
}

/* Dropdown styling */
.dropdown {
    position: absolute;
    background: var(--color-bg);
    border-radius: var(--border-radius);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.863);
    margin-top: 0.5rem;
    min-width: 12rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
    z-index: 1500;
}

.nav-item:hover > .dropdown,
.nav-item[aria-expanded="true"] > .dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown .dropdown {
    top: 0;
    left: 100%;
    margin-top: 0;
}

/* Dropdown items */
.dropdown li {
    list-style: none;
}

.dropdown li a {
    display: block;
    padding: 0.75rem 1.25rem;
    font-weight: 500;
    color: var(--color-primary);
    white-space: nowrap;
    transition: background-color var(--transition), color var(--transition);
    border-radius: var(--border-radius);
}

.dropdown li a:hover,
.dropdown li a:focus {
    background-color: var(--color-accent);
    color: #fff;
    outline: none;
}

/* Accessibility outlines */
a:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* Hamburger menu button for mobile */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    width: 2rem;
    height: 1.75rem;
    justify-content: center;
}

.hamburger span {
    display: block;
    height: 2.5px;
    width: 100%;
    background-color: var(--color-primary);
    border-radius: 2px;
    transition: background-color var(--transition);
}

.hamburger.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.hamburger.open span:nth-child(2) {
    opacity: 0;
}

.hamburger.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Hero Section */
.hero {
    padding-top: var(--spacing-large);
    padding-bottom: var(--spacing-large);
    text-align: center;
    color: var(--color-primary);
}

.hero img {
    width: 80px;
    height: auto;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.25rem;
    font-weight: 500;
    max-width: 600px;
    margin: 0 auto 2.5rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

/* Hero buttons container */
.container-hero-buttons {
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
}

/* Hero card boxes */
.box {
    position: relative;
    width: 240px;
    padding: 2rem;
    border-radius: var(--border-radius);
    background: #f9fafb;
    box-shadow: 0 8px 20px var(--color-shadow);
    cursor: pointer;
    transition: transform var(--transition), box-shadow var(--transition);
    color: var(--color-primary);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.box span {
    position: absolute;
    top: 0;
    left: 0;
    width: 8px;
    height: 100%;
    border-radius: var(--border-radius) 0 0 var(--border-radius);
    background: var(--color-accent);
}

.box h2 {
    margin: 0 0 1rem;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.5rem;
}

.box a {
    color: var(--color-accent);
    font-weight: 600;
    font-size: 1rem;
    border-bottom: 2px solid transparent;
    transition: border-color var(--transition), color var(--transition);
}

.box a:hover,
.box a:focus {
    border-color: var(--color-accent-hover);
    color: var(--color-accent-hover);
    outline: none;
}

.box:hover,
.box:focus-within {
    transform: translateY(-5px);
    box-shadow: 0 16px 48px var(--color-shadow);
    outline: none;
}

/* Main content sections */
main > section {
    padding-top: var(--spacing-large);
    padding-bottom: var(--spacing-medium);
    color: var(--color-text-primary);
    max-width: var(--max-width-container);
    margin-left: auto;
    margin-right: auto;
}

main section h2 {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--color-primary);
}

main section p {
    font-size: 1.125rem;
    margin-bottom: 1rem;
    max-width: 800px;
    line-height: 1.6;
}

/* Contact section address styling */
address {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
    margin-top: 0.5rem;
}

address a {
    color: var(--color-accent);
    font-weight: 600;
}

address a:hover,
address a:focus {
    color: var(--color-accent-hover);
}

/* Footer */
footer {
    background: #f9fafb;
    padding: 1.5rem 0;
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

footer a {
    color: var(--color-accent);
    font-weight: 600;
}

footer a:hover,
footer a:focus {
    color: var(--color-accent-hover);
}

/* Responsive Design */

@media (max-width: 991px) {
    .nav-links {
        position: fixed;
        top: 4.5rem;
        right: 0;
        background-color: var(--color-bg);
        height: calc(100vh - 4.5rem);
        width: 240px;
        flex-direction: column;
        padding: var(--spacing-medium);
        gap: var(--spacing-small);
        box-shadow: -4px 0 12px var(--color-shadow);
        overflow-y: auto;
        transform: translateX(100%);
        transition: transform var(--transition);
    }

    .nav-links.open {
        transform: translateX(0);
    }

    .nav-item {
        width: 100%;
    }

    .dropdown {
        position: relative;
        background: transparent;
        box-shadow: none;
        margin-top: 0;
        min-width: 100%;
        opacity: 1 !important;
        visibility: visible !important;
        transform: none !important;
    }

    .dropdown .dropdown {
        padding-left: 1rem;
    }

    .hamburger {
        display: flex;
    }

    .nav-item > a {
        padding: 1rem 0;
        display: block;
    }
}

@media (max-width: 480px) {
    .container-hero-buttons {
        flex-direction: column;
        gap: 2rem;
    }

    .box {
        width: 100%;
        max-width: 380px;
        margin-left: auto;
        margin-right: auto;
    }

    main section h2 {
        font-size: 2rem;
    }
}