/* =========================================================================
   CSS VARIABLES & THEMING
   ========================================================================= */
:root {
    /* Color Palette - Professional Navy/Slate with vibrant blue accents */
    --clr-bg-primary: #ffffff;
    --clr-bg-secondary: #f8fafc; /* Very light slate */
    --clr-text-main: #0f172a; /* Deep slate */
    --clr-text-muted: #64748b; /* Medium slate */
    
    --clr-accent-primary: #2563eb; /* Vibrant Royal Blue */
    --clr-accent-primary-hover: #1d4ed8;
    --clr-accent-secondary: #0ea5e9; /* Light Blue */
    
    --clr-border: #e2e8f0;
    --clr-white: #ffffff;
    
    /* Typography */
    --font-primary: 'Inter', sans-serif;
    --font-heading: 'Outfit', sans-serif;
    
    /* Transitions */
    --transition-fast: 0.2s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-card: 0 20px 25px -5px rgb(0 0 0 / 0.05), 0 8px 10px -6px rgb(0 0 0 / 0.01);
}

/* Dark Mode Variables (Optional enhancement for future)
[data-theme="dark"] {
    --clr-bg-primary: #0f172a;
    --clr-bg-secondary: #1e293b;
    --clr-text-main: #f8fafc;
    --clr-text-muted: #cbd5e1;
    --clr-border: #334155;
}
*/

/* =========================================================================
   RESET & BASE STYLES
   ========================================================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    background: linear-gradient(135deg, var(--clr-bg-secondary) 0%, var(--clr-bg-primary) 100%); /* Base gradient underneath canvas */
    color: var(--clr-text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--clr-text-main);
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* =========================================================================
   UTILITIES
   ========================================================================= */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section-padding {
    padding: 6rem 0;
}

.bg-alt {
    /* Make background slightly transparent so canvas behind shows through */
    background-color: rgba(248, 250, 252, 0.85); 
    backdrop-filter: blur(5px);
}

.section-title {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title h2 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.underline {
    height: 4px;
    width: 60px;
    background-color: var(--clr-accent-primary);
    margin: 0 auto;
    border-radius: 2px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    font-family: var(--font-primary);
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition-normal);
    text-align: center;
}

.btn-primary {
    background-color: var(--clr-accent-primary);
    color: var(--clr-white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background-color: var(--clr-accent-primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: transparent;
    color: var(--clr-text-main);
    border-color: var(--clr-border);
}

.btn-secondary:hover {
    border-color: var(--clr-text-main);
    background-color: var(--clr-bg-secondary);
}

.btn-primary-outline {
    background-color: transparent;
    color: var(--clr-accent-primary);
    border-color: var(--clr-accent-primary);
}

.btn-primary-outline:hover {
    background-color: var(--clr-accent-primary);
    color: var(--clr-white);
}

/* =========================================================================
   HEADER & NAVIGATION
   ========================================================================= */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

/* Scrolled state applied via JS */
header.scrolled {
    padding: 0.5rem 0;
    box-shadow: var(--shadow-md);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 80px;
    transition: var(--transition-normal);
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--clr-text-main);
}

.logo span {
    color: var(--clr-accent-primary);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

.nav-link {
    font-weight: 500;
    font-size: 1rem;
    color: var(--clr-text-main);
    position: relative;
}

.nav-link:not(.btn-primary-outline):hover {
    color: var(--clr-accent-primary);
}

/* Active Indicator */
.nav-link:not(.btn-primary-outline)::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--clr-accent-primary);
    transition: width var(--transition-normal);
}

.nav-link:not(.btn-primary-outline):hover::after,
.nav-link.active:not(.btn-primary-outline)::after {
    width: 100%;
}

.nav-link.active {
    color: var(--clr-accent-primary);
}

.nav-item .btn-primary-outline {
    padding: 0.5rem 1.2rem;
    border-radius: 2rem;
}

/* Hamburger Menu (Mobile) */
.hamburger {
    display: none;
    cursor: pointer;
}

.bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    transition: all var(--transition-normal);
    background-color: var(--clr-text-main);
    border-radius: 3px;
}

/* =========================================================================
   HERO SECTION
   ========================================================================= */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px; /* Offset header */
    /* Remove background so canvas shows through */
    background: transparent;
    overflow: hidden;
}

#bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1; /* Goes behind all content */
    pointer-events: none; /* Allows clicking through canvas to elements */
}

.hero-container {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.greeting {
    font-size: 1.2rem;
    color: var(--clr-accent-primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.hero-title {
    font-size: 4rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(90deg, var(--clr-text-main), var(--clr-accent-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 2rem;
    color: var(--clr-text-muted);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--clr-text-muted);
    max-width: 500px;
    margin-bottom: 2.5rem;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    margin-bottom: 2.5rem;
}

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

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background-color: var(--clr-bg-secondary);
    color: var(--clr-text-main);
    font-size: 1.2rem;
    border: 1px solid var(--clr-border);
    transition: var(--transition-normal);
}

.social-links a:hover {
    background-color: var(--clr-accent-primary);
    color: var(--clr-white);
    border-color: var(--clr-accent-primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

/* Hero Image Placeholder Styling (Using CSS for decorative element in absence of real img) */
.hero-image {
    position: relative;
    display: flex;
    justify-content: center;
}

.image-placeholder {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, var(--clr-accent-primary) 0%, var(--clr-accent-secondary) 100%);
    border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
    animation: morph 8s ease-in-out infinite;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.8);
    font-size: 5rem;
    box-shadow: var(--shadow-lg);
}

@keyframes morph {
    0% { border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%; }
    50% { border-radius: 70% 30% 30% 70% / 70% 70% 30% 30%; }
    100% { border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%; }
}

/* =========================================================================
   ABOUT SECTION
   ========================================================================= */
.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-text h3 {
    font-size: 1.8rem;
    color: var(--clr-text-main);
    margin-bottom: 1.5rem;
}

.about-text p {
    color: var(--clr-text-muted);
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

.about-stats {
    display: flex;
    justify-content: center;
    gap: 4rem;
    margin-top: 3rem;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    font-family: var(--font-heading);
    color: var(--clr-accent-primary);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-text {
    font-size: 0.9rem;
    color: var(--clr-text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

/* =========================================================================
   SKILLS SECTION
   ========================================================================= */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.skill-category {
    background-color: var(--clr-white);
    padding: 2.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-card);
    border: 1px solid var(--clr-border);
    transition: var(--transition-normal);
}

.skill-category:hover {
    transform: translateY(-5px);
    box-shadow: 0 25px 50px -12px rgb(0 0 0 / 0.1);
    border-color: var(--clr-accent-secondary);
}

.skill-category h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.skill-tag {
    background-color: var(--clr-bg-secondary);
    color: var(--clr-text-main);
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid var(--clr-border);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition-fast);
}

.skill-tag:hover {
    background-color: var(--clr-accent-primary);
    color: var(--clr-white);
    border-color: var(--clr-accent-primary);
}

/* =========================================================================
   PORTFOLIO SECTION
   ========================================================================= */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2.5rem;
}

.portfolio-item {
    background-color: var(--clr-white);
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
    border: 1px solid var(--clr-border);
}

.portfolio-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-card);
}

.portfolio-img {
    position: relative;
    height: 220px;
    overflow: hidden;
}

.img-placeholder {
    width: 100%;
    height: 100%;
    background-color: var(--clr-bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: var(--clr-text-muted);
    transition: var(--transition-slow);
}

.portfolio-item:hover .img-placeholder {
    transform: scale(1.05);
}

.portfolio-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(15, 23, 42, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    opacity: 0;
    transition: var(--transition-normal);
}

.portfolio-item:hover .portfolio-overlay {
    opacity: 1;
}

.portfolio-link {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--clr-white);
    color: var(--clr-accent-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transform: translateY(20px);
    transition: all var(--transition-normal);
}

.portfolio-item:hover .portfolio-link {
    transform: translateY(0);
}

.portfolio-link:hover {
    background-color: var(--clr-accent-primary);
    color: var(--clr-white);
}

.portfolio-link:nth-child(2) {
    transition-delay: 0.1s;
}

.portfolio-info {
    padding: 1.5rem;
}

.portfolio-info h3 {
    font-size: 1.3rem;
    margin-bottom: 0.8rem;
}

.portfolio-info p {
    color: var(--clr-text-muted);
    font-size: 0.95rem;
    margin-bottom: 1.2rem;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tech-stack span {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--clr-accent-primary);
    background-color: rgba(37, 99, 235, 0.1);
    padding: 0.3rem 0.8rem;
    border-radius: 1rem;
}

/* =========================================================================
   CONTACT SECTION
   ========================================================================= */
.contact-subtitle {
    text-align: center;
    color: var(--clr-text-muted);
    margin-top: 1rem;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
    background-color: var(--clr-white);
    padding: 3rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--clr-border);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.info-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.info-item i {
    font-size: 1.5rem;
    color: var(--clr-accent-primary);
    background-color: rgba(37, 99, 235, 0.1);
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 0.5rem;
}

.info-item h4 {
    margin-bottom: 0.2rem;
}

.info-item p {
    color: var(--clr-text-muted);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    width: 100%;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem 1.2rem;
    border: 1px solid var(--clr-border);
    border-radius: 0.5rem;
    font-family: var(--font-primary);
    font-size: 1rem;
    color: var(--clr-text-main);
    background-color: var(--clr-bg-primary);
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--clr-accent-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.btn-submit {
    align-self: flex-start;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* =========================================================================
   FOOTER
   ========================================================================= */
footer {
    background-color: var(--clr-text-main);
    color: var(--clr-text-muted);
    padding: 4rem 0 2rem;
    position: relative;
}

.footer-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.footer-logo {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--clr-white);
}

.footer-logo span {
    color: var(--clr-accent-primary);
}

.footer-socials {
    display: flex;
    gap: 1rem;
}

.footer-socials a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--clr-white);
    transition: var(--transition-normal);
}

.footer-socials a:hover {
    background-color: var(--clr-accent-primary);
    transform: translateY(-3px);
}

.copyright {
    font-size: 0.9rem;
    margin-top: 1rem;
}

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 45px;
    height: 45px;
    background-color: var(--clr-accent-primary);
    color: var(--clr-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    z-index: 99;
}

.back-to-top.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background-color: var(--clr-accent-primary-hover);
    transform: translateY(-3px);
}

/* =========================================================================
   ANIMATIONS (Scroll Reveal)
   ========================================================================= */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease-out;
}

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

.fade-right {
    transform: translateX(50px);
}

.fade-right.active {
    transform: translateX(0);
}

/* =========================================================================
   MEDIA QUERIES (Responsive Design)
   ========================================================================= */
@media screen and (max-width: 992px) {
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-subtitle {
        font-size: 1.5rem;
    }
    
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .contact-info {
        flex-direction: row;
        justify-content: space-around;
        gap: 1rem;
    }
}

@media screen and (max-width: 768px) {
    /* Navbar handling */
    .hamburger {
        display: block;
    }

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

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

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

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 80px;
        gap: 0;
        flex-direction: column;
        background-color: rgba(255, 255, 255, 0.98);
        width: 100%;
        height: calc(100vh - 80px);
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-md);
        padding-top: 2rem;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-item {
        margin: 1.5rem 0;
        width: 100%;
    }

    /* Layout Adjustments */
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .social-links {
        justify-content: center;
    }
    
    .hero-image {
        display: flex;
        justify-content: center;
        margin-top: 2rem;
    }

    .image-placeholder {
        width: 250px;
        height: 250px;
    }

    .about-stats {
        flex-direction: column;
        gap: 2rem;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }

    .contact-info {
        flex-direction: column;
    }
}

@media screen and (max-width: 576px) {
    .section-padding {
        padding: 4rem 0;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .section-title h2 {
        font-size: 2rem;
    }
    
    .portfolio-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        padding: 2rem 1.5rem;
    }
}