/* Basic Reset & Body */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Noto Sans', system-ui, sans-serif; /* Base font */
    transition: background-color 0.3s ease, color 0.3s ease;
    line-height: 1.7;
    font-size: 16px; /* Base font size */
}

/* --- Light/Dark Theme Variables (Inspired by Ashutosh's site) --- */
:root {
    /* Light Theme */
    --bg-color-light: #F9FAFB; /* Very light gray */
    --text-color-light: #1F2937; /* Dark gray */
    --link-color-light: #2563EB; /* Blue */
    --card-bg-light: #ffffff; /* White */
    --border-color-light: #E5E7EB; /* Light gray border */
    --subtle-text-light: #6B7280; /* Medium gray */
    --accent-color-light: #2563EB; /* Blue */
    --hero-overlay-light: rgba(249, 250, 251, 0.9); /* Slightly transparent light bg */
    --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.03);
    --shadow-hover-light: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);

    /* Dark Theme */
    --bg-color-dark: #111827; /* Very dark blue-gray */
    --text-color-dark: #F9FAFB; /* Off-white */
    --link-color-dark: #60A5FA; /* Light blue */
    --card-bg-dark: #1F2937; /* Dark gray-blue */
    --border-color-dark: #374151; /* Gray */
    --subtle-text-dark: #9CA3AF; /* Lighter gray */
    --accent-color-dark: #60A5FA; /* Light blue */
    --hero-overlay-dark: rgba(17, 24, 39, 0.9); /* Slightly transparent dark bg */
    --shadow-dark: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.08);
    --shadow-hover-dark: 0 4px 6px -1px rgba(0, 0, 0, 0.15), 0 2px 4px -1px rgba(0, 0, 0, 0.08);

    /* Glassmorphism Variables */
    --glass-bg-light: rgba(255, 255, 255, 0.7);
    --glass-bg-dark: rgba(31, 41, 55, 0.7);
    --glass-border-light: rgba(255, 255, 255, 0.5);
    --glass-border-dark: rgba(255, 255, 255, 0.1);
    
    /* Default to light theme */
    --bg-color: var(--bg-color-light);
    --text-color: var(--text-color-light);
    --link-color: var(--link-color-light);
    --card-bg: var(--glass-bg-light); /* Use glass bg */
    --border-color: var(--border-color-light);
    --subtle-text: var(--subtle-text-light);
    --accent-color: var(--accent-color-light);
    --hero-overlay: var(--hero-overlay-light);
    --shadow: var(--shadow-light);
    --shadow-hover: var(--shadow-hover-light);
    --glass-border: var(--glass-border-light);
}

body.dark-theme {
    --bg-color: var(--bg-color-dark);
    --text-color: var(--text-color-dark);
    --link-color: var(--link-color-dark);
    --card-bg: var(--glass-bg-dark); /* Use glass bg */
    --border-color: var(--border-color-dark);
    --subtle-text: var(--subtle-text-dark);
    --accent-color: var(--accent-color-dark);
    --hero-overlay: var(--hero-overlay-dark);
    --shadow: var(--shadow-dark);
    --shadow-hover: var(--shadow-hover-dark);
    --glass-border: var(--glass-border-dark);
}

/* Apply theme variables */
body,
html {
    height: 100%; /* Ensure html/body take full height if needed */
    width: 100%;
    overflow-x: hidden; /* Prevent horizontal scroll */
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
}

a {
    color: var(--link-color);
    text-decoration: none;
    transition: color 0.2s ease, opacity 0.2s ease;
}
a:hover {
    text-decoration: none; /* Remove underline */
    opacity: 0.8;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Outfit', sans-serif; /* Heading font */
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 0.75em;
    color: var(--text-color);
}

h1 {
    font-size: 3rem; /* Slightly larger */
    font-weight: 700;
    margin-bottom: 0.3em;
    letter-spacing: -0.5px;
}

h2 { /* Used for section titles */
    font-size: 2.25rem;
    font-weight: 600;
    margin-bottom: 1.5em;
    text-align: center;
    color: var(--text-color);
}

/* Subtitle in Hero */
.hero h2 {
    font-size: 1.25rem;
    color: var(--subtle-text);
    font-weight: 400; /* Less prominent */
    margin-bottom: 1.5em;
    text-align: center;
}

section > h2::after {
        content: '';
        display: block;
        width: 50px; /* Slightly smaller */
        height: 3px;
        background-color: var(--accent-color);
        margin: 0.6em auto 0;
        border-radius: 1px;
}

/* --- Layout & Sections --- */
.container {
        max-width: 1024px; /* Consistent max width */
        margin: 0 auto;
        padding: 0 20px;
}

header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(var(--bg-color-rgb), 0.8); /* Use RGB for transparency */
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    box-shadow: none; /* Cleaner look */
    padding: 0.5rem 0;
}

nav ul {
    list-style: none;
    text-align: center;
}

nav li {
    display: inline-block;
    margin: 0 1.2em; /* Slightly more spacing */
}

nav a {
    font-weight: 500; /* Noto Sans weight */
    padding: 0.8em 0.3em;
    position: relative;
    color: var(--text-color);
    transition: color 0.2s ease;
}

nav a:hover,
nav a.active {
        color: var(--accent-color);
        opacity: 1; /* Full opacity on hover */
}

nav a::after {
    content: '';
    display: block;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width 0.3s;
    position: absolute;
    bottom: 0;
    left: 0;
}

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

section {
    padding: 6rem 0; /* More vertical padding */
    border-bottom: 1px solid var(--border-color);
}
section:last-of-type {
        border-bottom: none;
}

.hero {
    text-align: center;
    min-height: 90vh; /* Almost full viewport height */
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding: 4rem 20px; /* Add padding */
    border-bottom: none; /* No border for hero */
}

/* Remove background image - focus on clean look */
.hero::before {
    /* Re-enable for background image */
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    /* Use local image file instead of Unsplash URL */
    background-image: url('images/tech-background.jpg');
    background-size: cover;
    background-position: center center;
    opacity: 0.1; /* Start with low opacity */
    z-index: -1;
    transition: opacity 0.5s ease-in-out;
}

body.dark-theme .hero::before {
    opacity: 0.15; /* Slightly more visible in dark mode */
}

/* Hero content styling */
.hero-content {
    /* Re-introduce overlay for contrast */
    background-color: var(--hero-overlay);
    padding: 2.5rem; /* Add padding back */
    border-radius: 12px; /* Rounded corners */
    z-index: 1;
    backdrop-filter: blur(8px); /* Subtle blur effect */
    box-shadow: var(--shadow); /* Subtle shadow */
    max-width: 700px; /* Limit width */
    /* Add animation properties */
    opacity: 0; /* Start hidden for animation */
    animation: fadeInHero 1s ease-out 0.5s forwards; /* Delay slightly */
}

/* Keyframes for hero fade-in */
@keyframes fadeInHero {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* --- Profile Picture Styling --- */
.profile-container {
    margin-bottom: 1.5em;
}

.profile-picture {
    width: 160px; /* Slightly smaller */
    height: 160px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--card-bg); /* Border matches card background */
    box-shadow: 0 0 0 3px var(--accent-color), var(--shadow); /* Accent ring + subtle shadow */
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.profile-picture:hover {
    transform: scale(1.03);
    box-shadow: 0 0 0 4px var(--accent-color), var(--shadow-hover);
}

.location {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 1em; /* More space */
    color: var(--subtle-text);
    font-size: 1rem;
}
.location i {
    margin-right: 0.5em;
}

#home p { /* Specific styling for hero paragraph */
        font-size: 1.1rem;
        color: var(--subtle-text);
        margin-top: 1.5em;
}

/* --- Theme Toggle Button --- */
#theme-toggle {
    position: fixed;
    bottom: 25px;
    right: 25px;
    cursor: pointer;
    z-index: 1000;
    background-color: var(--card-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 45px; /* Slightly smaller */
    height: 45px;
    font-size: 1.1em;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

#theme-toggle:hover {
    transform: translateY(-3px); /* Keep lift effect */
    box-shadow: var(--shadow-hover);
    background-color: var(--accent-color); /* Change bg on hover */
    color: var(--card-bg); /* Change icon color */
    border-color: var(--accent-color);
}

#theme-toggle .icon-sun { display: none; }
#theme-toggle .icon-moon { display: inline-block; }
body.dark-theme #theme-toggle .icon-sun { display: inline-block; }
body.dark-theme #theme-toggle .icon-moon { display: none; }

/* --- Cards & Items (Experience, Projects, etc.) --- */
.item {
    background-color: var(--card-bg);
    backdrop-filter: blur(12px); /* Glassmorphism blur */
    -webkit-backdrop-filter: blur(12px);
    padding: 2rem; /* More padding */
    margin-bottom: 2rem;
    border-radius: 16px; /* More rounded */
    border: 1px solid var(--glass-border); /* Glass border */
    box-shadow: var(--shadow);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.item:hover {
    transform: translateY(-5px); /* Lift effect */
    box-shadow: var(--shadow-hover);
}

.item h3 {
    font-size: 1.25rem;
    margin-top: 0;
    margin-bottom: 0.4em;
    color: var(--text-color); /* Title uses main text color */
    font-weight: 600; /* Outfit weight */
}

.item h3 a { /* If title is a link */
    color: inherit; /* Inherit color from h3 */
}
.item h3 a:hover {
    color: var(--link-color); /* Link color on hover */
    opacity: 1;
}

.item-meta {
    font-size: 0.9rem;
    color: var(--subtle-text);
    margin-bottom: 1.2em;
    display: flex;
    align-items: center;
    gap: 0.5em; /* Gap for icons */
}

.item p {
    margin-top: 0.8em;
    margin-bottom: 0.8em;
    color: var(--subtle-text); /* Subtle text for descriptions */
}

/* --- Experience Timeline --- */
#experience .container {
    position: relative;
    padding-left: 2rem; /* Space for line */
}

#experience .container::before {
    content: '';
    position: absolute;
    left: 0;
    top: 5rem; /* Start below heading */
    bottom: 2rem;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent-color), transparent);
    opacity: 0.5;
}

#experience .item {
    position: relative;
    margin-left: 1.5rem; /* Space from line */
}

#experience .item::before {
    content: '';
    position: absolute;
    left: -2.6rem; /* Align with line */
    top: 2.5rem;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: var(--accent-color);
    border: 4px solid var(--bg-color); /* Create "hole" effect */
    box-shadow: 0 0 0 2px var(--accent-color);
    z-index: 1;
}

/* Experience specific list styling */
#experience .item ul {
    list-style-type: none; /* Remove default bullets */
    padding-left: 0; /* Remove default padding */
    margin-top: 1em;
}

#experience .item li {
    position: relative;
    padding-left: 1.5em; /* Space for custom bullet */
    margin-bottom: 0.6em;
    color: var(--subtle-text);
}

#experience .item li::before {
    content: '•'; /* Custom bullet */
    position: absolute;
    left: 0;
    top: -1px;
    color: var(--accent-color);
    font-size: 1.2em;
    line-height: 1;
}

/* --- Project Grid --- */
.projects-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 768px) {
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* Make items equal height */
    .projects-grid .item {
        height: 100%;
        display: flex;
        flex-direction: column;
        margin-bottom: 0; /* Remove bottom margin in grid */
    }
    
    .projects-grid .item p {
        flex-grow: 1; /* Push tags to bottom */
    }
}

/* --- Tags --- */
.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px; /* Use gap for spacing */
    margin-top: 1.2em;
}

.tag {
    background-color: var(--accent-color); /* Accent background */
    color: var(--card-bg); /* Text color contrasts with accent */
    padding: 5px 12px;
    border-radius: 16px; /* Pill shape */
    font-size: 0.8rem;
    font-weight: 500; /* Noto Sans weight */
    transition: background-color 0.2s ease;
    white-space: nowrap;
}

/* Remove theme-specific tag background overrides */
/* body.dark-theme .tag { ... } */

/* --- GitHub stats and achievements --- */
.github-stats {
    display: grid; /* Use grid for alignment */
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); /* Responsive columns */
    gap: 1.5rem;
    margin: 2.5em 0;
}

.stat-item {
    background-color: var(--card-bg);
    padding: 1.2rem 1rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stat-item:hover {
        transform: translateY(-3px);
        box-shadow: var(--shadow-hover);
}

.stat-number {
    font-size: 1.8rem; /* Larger number */
    font-weight: 700; /* Outfit weight */
    font-family: 'Outfit', sans-serif;
    color: var(--accent-color);
    line-height: 1.1;
    margin-bottom: 0.2em;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--subtle-text);
    text-transform: capitalize; /* Capitalize labels */
}

/* Center text elements like intro paragraphs */
.text-center {
        text-align: center;
}

#connect p.text-center { /* Style intro paragraph in Connect section */
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    color: var(--subtle-text);
    margin-bottom: 2em;
}

.achievements {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 2em auto;
    flex-wrap: wrap;
    max-width: 700px; /* Limit width */
}

.achievement {
    background-color: rgba(var(--accent-color-rgb), 0.1); /* Subtle accent bg */
    color: var(--accent-color);
    padding: 8px 15px;
    border-radius: 20px; /* Pill shape */
    border: 1px solid transparent; /* No border needed */
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500; /* Noto Sans weight */
}
.achievement i {
    opacity: 0.8;
}

/* Connect section link item */
    #connect .item {
        max-width: 700px;
        margin-left: auto;
        margin-right: auto;
        margin-top: 3rem; /* Space above the connect box */
    }
    #connect .item h3 {
        text-align: center;
        font-size: 1.5rem;
        margin-bottom: 1em;
    }
    #connect .item p {
        text-align: center;
        margin-bottom: 1.5em; /* Space between lines */
        color: var(--text-color); /* Use main text color */
    }
    #connect .item p a {
        font-weight: 500;
        display: inline-flex; /* Align icon and text */
        align-items: center;
        gap: 0.5em;
        transition: color 0.2s ease;
    }
    #connect .item p a:hover {
        color: var(--accent-color);
        opacity: 1;
    }
    #connect .item p a i {
        font-size: 1.1em;
    }
    
    
/* --- Typewriter Effect --- */
.typewriter {
    display: inline-block;
    overflow: hidden; /* Ensures the content is not revealed until the animation */
    border-right: .15em solid var(--accent-color); /* The typwriter cursor */
    white-space: nowrap; /* Keeps the content on a single line */
    margin: 0 auto; /* Gives that scrolling effect as the typing happens */
    animation: 
        typing 3.5s steps(40, end),
        blink-caret .75s step-end infinite;
    max-width: 100%;
}

@keyframes typing {
    from { width: 0 }
    to { width: 100% }
}

@keyframes blink-caret {
    from, to { border-color: transparent }
    50% { border-color: var(--accent-color); }
}

/* --- Buttons & Forms --- */
.btn-primary {
    display: inline-block;
    background-color: var(--accent-color);
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    margin-top: 1.5rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(var(--accent-color-rgb), 0.4);
    opacity: 0.9;
    color: white;
}

form {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    margin-bottom: 2rem;
    text-align: left;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

label {
    font-weight: 500;
    color: var(--text-color);
    font-size: 0.9rem;
}

input, textarea {
    padding: 0.8rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: rgba(var(--bg-color-rgb), 0.5);
    color: var(--text-color);
    font-family: inherit;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:focus, textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(var(--accent-color-rgb), 0.2);
}

.social-links-connect {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-items: center;
    margin-top: 2rem;
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
}

/* --- Footer --- */
    footer {
    text-align: center;
    padding: 3rem 20px; /* More padding */
    margin-top: 4rem; /* More separation */
    font-size: 0.9rem;
    color: var(--subtle-text);
    background-color: var(--card-bg); /* Use card background */
    border-top: 1px solid var(--border-color);
    }
    
    .social-links {
        display: flex;
        justify-content: center;
        gap: 1.5rem; /* More space */
        margin-top: 1.5rem;
    }
    
    .social-links a {
        color: var(--subtle-text);
        font-size: 1.4em; /* Larger icons */
        transition: color 0.2s ease, transform 0.2s ease;
    }
    
    .social-links a:hover {
        color: var(--accent-color);
        transform: translateY(-2px); /* Slight lift on hover */
    }

/* --- Tech Stack Section --- */
.tech-stack {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem 2rem; /* More gap */
    margin: 3em 0;
}

.tech-item {
    text-align: center;
    width: 90px; /* Slightly wider */
}

.tech-icon {
    width: 48px; /* Consistent size */
    height: 48px;
    object-fit: contain;
    margin-bottom: 0.75em;
    transition: transform 0.25s ease, filter 0.25s ease;
    filter: grayscale(50%) opacity(0.8); /* Start slightly desaturated */
}

.tech-item:hover .tech-icon {
    transform: translateY(-4px);
    filter: grayscale(0%) opacity(1); /* Full color on hover */
}

/* Specific fix for GitHub icon visibility in dark mode */
body.dark-theme .tech-icon[src*="github-original"] {
    filter: invert(1) grayscale(100%) brightness(1.5); /* Invert color to white */
}

/* Ensure hover effect works correctly with inverted GitHub icon */
body.dark-theme .tech-item:hover .tech-icon[src*="github-original"] {
    filter: invert(1) grayscale(0%) brightness(1); /* Keep inverted, full color intensity */
}

.tech-name {
    font-size: 0.85rem;
    color: var(--subtle-text);
    font-weight: 500; /* Noto Sans weight */
}

/* --- Tech Stack Marquee --- */
.marquee-container {
    overflow: hidden;
    width: 100%;
    mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
    -webkit-mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
}

.marquee-content {
    display: flex;
    gap: 3rem;
    width: max-content;
    animation: scroll 30s linear infinite;
    padding: 1rem 0;
}

.marquee-content:hover {
    animation-play-state: paused;
}

@keyframes scroll {
    from { transform: translateX(0); }
    to { transform: translateX(-50%); }
}

/* --- Project Images --- */
.project-image-container {
    margin-bottom: 1.5em;
    border-radius: 10px; /* Consistent rounding */
    overflow: hidden;
    box-shadow: var(--shadow);
    position: relative; /* Needed for potential overlay effects */
}

.project-image {
    width: 100%;
    height: auto;
    display: block; /* Remove extra space below image */
    transition: transform 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94); /* Smoother zoom */
}

.item:hover .project-image { /* Zoom image when hovering the item */
    transform: scale(1.03);
}

/* --- Activity Feed --- */
    .activity-feed {
        margin: 3em auto 0; /* Add top margin */
        max-width: 700px;
    }
    
    /* Activity Feed Heading */
    #connect > h3.text-center {
        font-size: 1.75rem; /* Style the heading if created by JS */
        margin-bottom: 1.5em;
        color: var(--text-color);
    }

    .activity-item {
        display: flex;
        align-items: flex-start;
        gap: 1rem; /* Use gap */
        margin-bottom: 1rem;
        padding: 1rem 1.25rem; /* Adjust padding */
        background-color: var(--card-bg);
        border-radius: 10px;
        border: 1px solid var(--border-color);
        box-shadow: var(--shadow);
        transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    
    .activity-item:hover {
        transform: translateY(-3px);
        box-shadow: var(--shadow-hover);
    }
    
    .activity-icon {
        color: var(--accent-color);
        font-size: 1.1em; /* Slightly smaller */
        margin-right: 0; /* Remove margin, use gap */
        padding-top: 3px; /* Align icon nicely */
        flex-shrink: 0; /* Prevent icon from shrinking */
    }
    
    .activity-content {
        flex: 1;
    }
    
    .activity-action {
        margin-bottom: 4px;
        line-height: 1.5; /* Better readability */
        color: var(--text-color); /* Main text color */
    }
    .activity-action a {
        font-weight: 500; /* Noto Sans weight */
        color: var(--link-color);
    }
    .activity-action a:hover {
        text-decoration: underline;
        opacity: 0.9;
    }
    
    .activity-date {
        color: var(--subtle-text);
        font-size: 0.8rem;
    }

/* Helper class for paragraphs in About section */
#about p {
        margin-bottom: 1.2em;
        max-width: 750px; /* Limit width for readability */
        margin-left: auto;
        margin-right: auto;
        text-align: justify; /* Justify text for a cleaner look */
}
#about p:last-of-type {
        margin-bottom: 2em; /* Add more space before tech stack */
}
#about h3 { /* Tech stack heading */
        text-align: center;
        font-size: 1.5rem;
        margin-top: 2.5em;
        margin-bottom: 1.5em;
        font-weight: 600; /* Outfit weight */
}

/* --- Responsiveness --- */
@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 1.8rem; }
    .hero h2 { font-size: 1.1rem; }
    
    section { padding: 4rem 0; }
    
    .container { padding: 0 15px; }
    
    nav ul { padding: 0.5rem 0; }
    nav li { margin: 0 0.8em; }
    nav a { padding: 0.6em 0.2em; }

    .profile-picture { width: 140px; height: 140px; }
    
    .github-stats { gap: 1rem; }
    .stat-item { padding: 1rem 0.8rem; }
    .stat-number { font-size: 1.5rem; }
    
    #about p { text-align: left; } /* Revert justify on smaller screens */
}
    
@media (max-width: 600px) {
    body { font-size: 15px; }
    h1 { font-size: 2rem; }
    h2 { font-size: 1.6rem; }
    .hero h2 { font-size: 1rem; }
    
    section { padding: 3rem 0; }
    
    header { padding: 0.3rem 0; }
    nav li { margin: 0 0.5em; }
    nav a { font-size: 0.95rem; }
    
    .profile-picture { width: 120px; height: 120px; }
    
    .item { padding: 1.5rem; }
    .item h3 { font-size: 1.15rem; }

    .github-stats {
        grid-template-columns: repeat(2, 1fr); /* 2 columns on mobile */
    }
    
    .stat-item { padding: 0.8rem; }
    .stat-number { font-size: 1.4rem; }

    .tech-stack { gap: 1rem 1.5rem; }
    .tech-item { width: 75px; }
    .tech-icon { width: 40px; height: 40px; }
    
    #theme-toggle {
        width: 40px;
        height: 40px;
        font-size: 1em;
        bottom: 15px;
        right: 15px;
    }
    
    footer { padding: 2.5rem 15px; }
    .social-links { gap: 1.2rem; }
    .social-links a { font-size: 1.3em; }
    
        /* Ensure activity feed wraps nicely */
        .activity-item { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
        .activity-icon { padding-top: 0; margin-bottom: 0.3rem; }
}

/* Utility to parse RGB from CSS variable */
/* We need this for the transparent header background */
/* :root variables for RGB are populated by JS */

/* --- Scroll Animation --- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.17, 0.55, 0.55, 1), transform 0.8s cubic-bezier(0.17, 0.55, 0.55, 1);
}

.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Dark mode header contrast fix */
body.dark-theme header {
    background-color: var(--card-bg-dark); /* Use solid card background for contrast */
    backdrop-filter: none; /* No blur needed for opaque background */
}

/* Opacity change for stale/failed data */
.github-stats,
.activity-feed {
    transition: opacity 0.3s ease-in-out;
    opacity: 1;
}

.data-stale {
    opacity: 0.8; /* Make it slightly less prominent */
}