/* =========================================
   CSS Custom Properties & Core Variables
   ========================================= */
   :root {
    /* Color Palette: Dark mode with vibrant cyan/blue emphasis */
    --bg-main: #0a0d14;            /* Very dark, elegant blue/black */
    --bg-secondary: #111827;       /* Slightly lighter surface background for contrast */
    --bg-tertiary: #1f2937;        /* Lighter surface for hover states */
    
    --text-primary: #f3f4f6;       /* Clean off-white for main text */
    --text-secondary: #9ca3af;     /* Muted gray for paragraphs and secondary info */
    
    --accent-color: #00f0ff;       /* Vibrant cyan/aqua for interactions/highlights */
    --accent-glow: rgba(0, 240, 255, 0.4);
    
    /* Typography */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
    
    /* Utility */
    --transition-fast: 0.2s ease-in-out;
    --transition-medium: 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    --border-radius-md: 10px;
    --border-radius-lg: 16px;
    --max-width-container: 1100px;
}

/* =========================================
   Reset & Base Styles
   ========================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px; /* Offset for fixed navbar */
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, .logo {
    font-family: var(--font-heading);
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-medium);
}

ul {
    list-style: none;
}

/* =========================================
   Typography & Reusable Utilities
   ========================================= */
.section-spacing {
    padding: 100px 5%;
    max-width: var(--max-width-container);
    margin: 0 auto;
}

.section-title {
    display: flex;
    align-items: center;
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    margin-bottom: 3rem;
    position: relative;
    white-space: nowrap;
}

/* Horizontal line after section titles */
.section-title::after {
    content: "";
    display: block;
    height: 1px;
    background-color: rgba(255, 255, 255, 0.1);
    flex-grow: 1;
    margin-left: 20px;
}

.center-title {
    justify-content: center;
}
.center-title::after, .center-title::before {
    display: none;
}

/* Buttons */
.cta-button {
    display: inline-block;
    padding: 1rem 2.5rem;
    background-color: transparent;
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
    border-radius: 4px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    z-index: 1;
    margin-top: 2rem;
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0%;
    height: 100%;
    background-color: rgba(0, 240, 255, 0.1);
    transition: var(--transition-medium);
    z-index: -1;
}

.cta-button:hover::before {
    width: 100%;
}

.cta-button:hover {
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.2);
    transform: translateY(-2px);
}

/* =========================================
   Navigation Bar
   ========================================= */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    background-color: rgba(10, 13, 20, 0.85); /* Semi-transparent */
    backdrop-filter: blur(12px); /* Glassmorphism */
    z-index: 1000;
    transition: var(--transition-medium);
}

.navbar.scrolled {
    padding: 1rem 5%;
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.7);
}

.navbar.hidden-nav {
    transform: translateY(-100%);
}

.logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
    letter-spacing: 1px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-size: 0.95rem;
    font-family: var(--font-heading);
    color: var(--text-primary);
    position: relative;
    padding: 0.5rem 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: var(--transition-medium);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.nav-links a:hover {
    color: var(--accent-color);
}

/* Hamburger Menu Icon (Mobile) */
.hamburger {
    display: none;
    cursor: pointer;
    z-index: 1001; /* Above modal nav */
}

.hamburger .bar {
    display: block;
    width: 28px;
    height: 3px;
    margin: 6px auto;
    background-color: var(--text-primary);
    transition: var(--transition-medium);
    border-radius: 2px;
}

/* =========================================
   1. Hero Section
   ========================================= */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
}

.hero-content {
    max-width: 800px;
}

.greeting {
    color: var(--accent-color);
    font-family: var(--font-heading);
    font-weight: 400;
    font-size: clamp(1rem, 2vw, 1.2rem);
    margin-bottom: 1rem;
    letter-spacing: 1px;
}

.name {
    font-size: clamp(3rem, 7vw, 5rem);
    font-weight: 700;
    line-height: 1.1;
    color: #ffffff;
}

.title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 600;
    color: var(--text-secondary);
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.hero .summary {
    font-size: clamp(1rem, 2vw, 1.15rem);
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 2.5rem;
}

.social-links {
    display: flex;
    gap: 1.5rem;
}

.social-links a {
    font-size: 1.8rem;
    color: var(--text-secondary);
}

.social-links a:hover {
    color: var(--accent-color);
    transform: translateY(-3px);
}

/* Mouse Scroll Animation */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0.6;
    animation: bounce 2s infinite ease-in-out;
}

.mouse {
    width: 24px;
    height: 38px;
    border: 2px solid var(--text-secondary);
    border-radius: 12px;
    position: relative;
}

.mouse::before {
    content: '';
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 6px;
    border-radius: 2px;
    background-color: var(--accent-color);
    animation: scrollSlide 2s infinite ease-in-out;
}

@keyframes scrollSlide {
    0% { top: 6px; opacity: 1; }
    100% { top: 20px; opacity: 0; }
}

@keyframes bounce {
    0%, 100% { transform: translate(-50%, 0); }
    50% { transform: translate(-50%, -10px); }
}

/* =========================================
   2. Expertise Section
   ========================================= */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
}

.skill-category-card {
    background-color: var(--bg-secondary);
    padding: 2.5rem 2rem;
    border-radius: var(--border-radius-md);
    border: 1px solid rgba(255,255,255,0.03);
    transition: var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.skill-category-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 3px;
    background: transparent;
    transition: var(--transition-medium);
}

.skill-category-card:hover {
    transform: translateY(-8px);
    background-color: var(--bg-tertiary);
    box-shadow: 0 15px 30px rgba(0,0,0,0.4);
}

.skill-category-card:hover::before {
    background: var(--accent-color);
    box-shadow: 0 0 10px var(--accent-glow);
}

.skill-icon {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 1.5rem;
}

.skill-category-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1.2rem;
}

.skill-list li {
    color: var(--text-secondary);
    margin-bottom: 0.6rem;
    display: flex;
    align-items: center;
    font-size: 0.95rem;
}

.skill-list li::before {
    content: "▹";
    color: var(--accent-color);
    margin-right: 10px;
    font-size: 1.2rem;
}

.tag {
    background-color: rgba(0, 240, 255, 0.1);
    color: var(--accent-color);
    font-size: 0.7rem;
    padding: 2px 6px;
    border-radius: 4px;
    margin-left: auto;
    font-weight: 600;
}

/* =========================================
   3. Featured Projects
   ========================================= */
.project-cards-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.project-card {
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius-md);
    box-shadow: 0 10px 30px -15px rgba(0,0,0,0.5);
    transition: var(--transition-medium);
    display: flex;
    flex-direction: column;
    padding: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px -15px rgba(0, 240, 255, 0.15);
}

.project-content {
    display: flex;
    flex-direction: column;
    height: 100%;
    justify-content: space-between;
}

.project-header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.folder-icon {
    font-size: 2.8rem;
    color: var(--accent-color);
}

.link-icon {
    font-size: 1.6rem;
    color: var(--text-secondary);
}

.link-icon:hover {
    color: var(--accent-color);
}

.project-title {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
    transition: var(--transition-fast);
}

.project-card:hover .project-title {
    color: var(--accent-color);
}

.project-description {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.5;
    margin-bottom: 2rem;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.tech-stack li {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Clean Button replacing standard links for visibility */
.btn-inspect {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    gap: 0.6rem;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 0.8rem 1.2rem;
    border-radius: 6px;
    font-family: var(--font-heading);
    font-weight: 500;
    transition: var(--transition-medium);
    border: 1px solid rgba(255,255,255,0.05);
}

.btn-inspect:hover {
    background-color: var(--accent-color);
    color: var(--bg-main);
    border-color: var(--accent-color);
    font-weight: 600;
}

/* =========================================
   4. Contact Section
   ========================================= */
.contact-section {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.contact-text {
    color: var(--text-secondary);
    font-size: 1.15rem;
    margin-bottom: 2rem;
}

/* =========================================
   Footer
   ========================================= */
.site-footer {
    text-align: center;
    padding: 2rem;
    background-color: #06090e; /* Slightly darker than main BG */
    color: var(--text-secondary);
    font-family: var(--font-heading);
    font-size: 0.9rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-icons {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.footer-icons a {
    color: var(--text-secondary);
    font-size: 1.2rem;
}

.footer-icons a:hover {
    color: var(--accent-color);
}

/* =========================================
   CSS Animations (Intersection Observer)
   ========================================= */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s cubic-bezier(0.5, 0, 0, 1), transform 0.8s cubic-bezier(0.5, 0, 0, 1);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* =========================================
   Responsive Design & Media Queries
   ========================================= */
/* Tablet & Large Mobile */
@media (max-width: 768px) {
    .section-spacing {
        padding: 80px 5%;
    }
    
    .hamburger {
        display: block;
    }
    
    .nav-links {
        position: fixed;
        right: -100%; /* Hidden off-screen */
        top: 0;
        flex-direction: column;
        background-color: var(--bg-secondary);
        width: 70%;
        height: 100vh;
        justify-content: center;
        align-items: center;
        transition: 0.4s ease-in-out;
        box-shadow: -15px 0 30px rgba(0,0,0,0.6);
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .nav-links li {
        margin: 1.5rem 0;
    }
    
    .nav-links a {
        font-size: 1.3rem;
    }
    
    /* Hamburger Animation to 'X' */
    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }
    .hamburger.active .bar:nth-child(1) {
        transform: translateY(9px) rotate(45deg);
    }
    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-9px) rotate(-45deg);
    }
    
    .section-title::after {
        width: 100px;
    }
}

/* Mobile Devices */
@media (max-width: 480px) {
    .project-cards-container {
        grid-template-columns: 1fr;
    }
    
    .social-links {
        justify-content: flex-start;
    }
    
    .hero-content {
        text-align: left;
    }
}