:root {
    --primary: #4ade80;
    --primary-hover: #22c55e;
    --bg-color: #0f172a;
    --surface-color: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --nav-height: 70px;
    --overlay-bg: rgba(15, 23, 42, 0.8);
    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
}

[data-theme="light"] {
    --bg-color: #f8fafc;
    --surface-color: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --border-color: #e2e8f0;
    --overlay-bg: rgba(248, 250, 252, 0.8);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.05);
}

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

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s, color 0.3s;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
    background: var(--surface-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.animated-logo {
    position: relative;
    font-size: 4rem;
    font-weight: 700;
    color: var(--primary);
}

.logo-particles {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120px;
    height: 120px;
    border: 2px solid var(--primary);
    border-radius: 50%;
    animation: ripple 1.5s infinite linear;
}

@keyframes ripple {
    0% { width: 0; height: 0; opacity: 1; border-width: 4px; }
    100% { width: 150px; height: 150px; opacity: 0; border-width: 0; }
}

/* Particles Background */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

/* Header & Nav */
header {
    position: fixed;
    top: 0;
    width: 100%;
    height: var(--nav-height);
    background: rgba(15, 23, 42, 0.7); /* Fallback */
    background: color-mix(in srgb, var(--bg-color), transparent 20%);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
}

.logo a {
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
}

.logo-m {
    color: var(--primary);
    margin-right: 2px;
}

.nav-container {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    position: relative;
    transition: color 0.3s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 0;
    background-color: var(--primary);
    transition: width 0.3s;
}

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

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

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.2rem;
    cursor: pointer;
    transition: transform 0.3s, color 0.3s;
}

.theme-toggle:hover {
    color: var(--primary);
    transform: rotate(15deg);
}

.burger {
    display: none;
    cursor: pointer;
    background: none;
    border: none;
}

.burger .line {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    margin: 5px;
    transition: var(--transition);
}

/* Main Layout */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: calc(var(--nav-height) + 2rem) 2rem 2rem;
}

section {
    margin-bottom: 6rem;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

section.visible {
    opacity: 1;
    transform: translateY(0);
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    position: relative;
    display: inline-block;
}

h1::after {
    content: '';
    position: absolute;
    width: 60px;
    height: 4px;
    bottom: -8px;
    left: 0;
    background: var(--primary);
    border-radius: 2px;
}

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

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

.skills h3 {
    margin-bottom: 1rem;
}

.skills ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.skills li {
    background: var(--surface-color);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    font-weight: 500;
    color: var(--primary);
}

.floating {
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0px); }
}

/* Portfolio Grid */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.portfolio-item {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    aspect-ratio: 16/9;
    cursor: pointer;
    box-shadow: var(--shadow);
    background: var(--surface-color);
}

.portfolio-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
}

.item-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.9), transparent);
    padding: 2rem 1.5rem 1rem;
    transform: translateY(100%);
    transition: transform 0.3s;
    color: #fff;
}

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

.portfolio-item:hover img {
    transform: scale(1.1);
}

.item-overlay h3 {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
    color: var(--primary);
}

.item-overlay p {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* Contact Section */
.contact-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    text-align: center;
}

.contact-method {
    background: var(--surface-color);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.contact-method:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: var(--shadow);
}

.contact-method i {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 1rem;
    display: block;
}

.contact-method h3 a {
    text-decoration: none;
    color: var(--text-primary);
}

.contact-method p {
    color: var(--text-secondary);
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    overflow: auto;
    padding: 2rem;
    opacity: 0;
    transition: opacity 0.3s;
}

.modal.active {
    opacity: 1;
}

.modal-content {
    background-color: var(--bg-color);
    margin: auto;
    padding: 2rem;
    border: 1px solid var(--border-color);
    width: 100%;
    max-width: 900px;
    border-radius: 16px;
    position: relative;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    transform: scale(0.9);
    transition: transform 0.3s;
}

.modal.active .modal-content {
    transform: scale(1);
}

.close {
    color: var(--text-secondary);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s;
}

.close:hover {
    color: var(--primary);
}

.modal h2 {
    color: var(--primary);
    margin-bottom: 1rem;
}

.text-content p {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

.project-gallery {
    margin: 2rem 0;
    width: 100%; /* Ensure gallery takes full width of container */
}

.gallery-scroll {
    display: flex;
    overflow-x: auto;
    gap: 1rem;
    padding-bottom: 1rem;
    width: 100%; /* Ensure container fills parent */
    scroll-snap-type: x mandatory;
    scrollbar-width: thin;
}

.gallery-scroll::-webkit-scrollbar {
    height: 6px;
}

.gallery-scroll::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.gallery-img {
    height: 250px;
    width: auto;
    border-radius: 8px;
    scroll-snap-align: start;
    cursor: zoom-in;
    transition: opacity 0.3s;
    object-fit: contain; /* Ensure image isn't distorted */
    flex-shrink: 0; /* Prevent images from shrinking */
}

.img-container:hover {
    opacity: 0.9;
}

.tech-used {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.tech-used span {
    font-size: 0.8rem;
    padding: 0.25rem 0.75rem;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    color: var(--primary);
}

/* Image Viewer */
.image-viewer {
    display: none;
    position: fixed;
    z-index: 3000;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.95);
    justify-content: center;
    align-items: center;
}

.viewer-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
}

.fullscreen-image {
    max-width: 100%;
    max-height: 90vh;
    object-fit: contain;
    border-radius: 4px;
}

.viewer-nav, .close-viewer {
    position: absolute;
    background: rgba(255,255,255,0.1);
    border: none;
    color: white;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s;
}

.viewer-nav:hover, .close-viewer:hover {
    background: var(--primary);
}

.close-viewer {
    top: -20px;
    right: -20px;
}

.prev-arrow {
    left: -60px;
    top: 50%;
    transform: translateY(-50%);
}

.next-arrow {
    right: -60px;
    top: 50%;
    transform: translateY(-50%);
}

/* Scroll Top Button */
.scroll-top-btn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    z-index: 900;
}

.scroll-top-btn.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-top-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-3px);
}

/* Footer */
footer {
    background: var(--surface-color);
    padding: 3rem 2rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.footer-section h3 {
    color: var(--primary);
    margin-bottom: 1rem;
}

.footer-section p {
    color: var(--text-secondary);
    margin: 0.5rem 0;
}

.footer-bottom {
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    /* Hide top header background/border, keep only logo */
    header {
        background: transparent;
        backdrop-filter: none;
        border-bottom: none;
        pointer-events: none; /* Let clicks pass through empty areas */
        height: auto;
    }
    
    .logo {
        pointer-events: auto; /* Re-enable logo clicks */
        background: var(--surface-color); /* Add bg to make logo readable */
        padding: 0.5rem 1rem;
        border-radius: 0 0 10px 0;
        box-shadow: 2px 2px 10px rgba(0,0,0,0.1);
        display: inline-block;
        margin-top: 0;
    }

    nav {
        padding: 0;
        align-items: flex-start; /* Align logo to top */
    }

    /* Move entire nav container to bottom */
    .nav-container {
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: rgba(15, 23, 42, 0.95);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        border-top: 1px solid var(--border-color);
        padding: 0.5rem 0;
        display: flex;
        justify-content: space-around;
        align-items: center;
        gap: 0;
        z-index: 1000;
        box-shadow: 0 -4px 20px rgba(0,0,0,0.2);
        pointer-events: auto;
    }
    
    [data-theme="light"] .nav-container {
        background: rgba(255, 255, 255, 0.95);
    }

    /* Reset nav-links inside container */
    .nav-links {
        position: static;
        width: auto;
        height: auto;
        background: transparent;
        transform: none;
        box-shadow: none;
        padding: 0;
        flex-direction: row;
        display: flex;
        flex: 1;
        justify-content: space-around;
        gap: 0;
    }

    .nav-links li {
        width: auto;
        display: flex;
        justify-content: center;
        flex: 1;
    }

    .nav-links a {
        flex-direction: column;
        gap: 4px;
        font-size: 0.75rem;
        padding: 0.5rem;
        color: var(--text-secondary); /* Dim inactive links */
    }
    
    .nav-links a.active, .nav-links a:hover {
        color: var(--primary);
    }
    
    .nav-links a::after {
        display: none;
    }

    .nav-links a i {
        font-size: 1.4rem;
        margin-bottom: 2px;
    }
    
    /* Style theme toggle in bottom bar */
    .theme-toggle {
        font-size: 1.2rem;
        padding: 0.5rem;
        margin-right: 1rem; /* Adjust spacing */
        color: var(--text-secondary);
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 4px;
    }
    
    .theme-toggle i {
        font-size: 1.4rem;
    }
    
    /* Add label to toggle matching links style */
    .theme-toggle::after {
        content: 'Theme';
        font-size: 0.75rem;
        font-family: var(--font-main);
        font-weight: 500;
    }

    .burger {
        display: none !important;
    }

    .about-content {
        grid-template-columns: 1fr;
    }
    
    .nav-overlay {
        display: none;
    }

    main {
        padding-top: 4rem; /* Reduced top padding */
        padding-bottom: 90px;
    }
    
    footer {
        padding-bottom: 90px;
    }

    .scroll-top-btn {
        bottom: 90px;
        right: 1rem;
    }

    .modal-content {
        width: 95%;
        margin: 5% auto;
        padding: 1.5rem;
        max-height: 85vh; /* Ensure modal fits with bottom bar */
    }
}