:root {
    /* Dark Theme (Default) */
    --bg-color: #0a0a0a;
    --text-color: #ffffff;
    --text-secondary: #a0a0a0;
    --accent-color: #8A2BE2;
    --accent-hover: #9D00FF;
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --nav-bg: rgba(10, 10, 10, 0.8);
    --blob-color: rgba(138, 43, 226, 0.3);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}


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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

/* Loader - Split Screen Reveal */
.load-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    pointer-events: none;
}

.load-left,
.load-right {
    position: absolute;
    top: 0;
    width: 50%;
    height: 100%;
    background: linear-gradient(135deg, var(--bg-color) 0%, #1a1a1a 100%);
    transition: transform 0.8s cubic-bezier(0.645, 0.045, 0.355, 1);
}

.load-left {
    left: 0;
    border-right: 2px solid var(--accent-color);
}

.load-right {
    right: 0;
    border-left: 2px solid var(--accent-color);
}

.load-overlay.hidden .load-left {
    transform: translateX(-100%);
}

.load-overlay.hidden .load-right {
    transform: translateX(100%);
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    line-height: 1.2;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

ul {
    list-style: none;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.text-gradient {
    background: linear-gradient(to right, var(--accent-color), #d946ef);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--card-border);
    padding: 1rem 0;
    transition: all 0.3s ease;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
}

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

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

.nav-link {
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: width 0.3s ease;
}

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

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease;
}

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

.sun-icon {
    display: none;
}

[data-theme="light"] .sun-icon {
    display: block;
}

[data-theme="light"] .moon-icon {
    display: none;
}

/* Hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    transition: all 0.3s ease;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    position: relative;
    overflow: hidden;
}

#heroCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

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

.greeting {
    font-size: 1.2rem;
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 1rem;
    display: block;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
}

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

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.btn {
    padding: 0.8rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-block;
}

.btn-primary {
    background-color: var(--accent-color);
    color: white;
    border: 2px solid var(--accent-color);
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    border-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px -10px var(--accent-color);
}

.btn-outline {
    background-color: transparent;
    color: var(--text-color);
    border: 2px solid var(--text-secondary);
}

.btn-outline:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    transform: translateY(-2px);
}

.hero-image {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2;
}

.image-wrapper {
    position: relative;
    width: 100%;
    max-width: 400px;
    aspect-ratio: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    border: 4px solid var(--accent-color);
    border-radius: 50%;
    padding: 10px;
    background: rgb(17, 17, 17);
    box-shadow: 0 0 30px rgba(138, 43, 226, 0.3);
    overflow: hidden;
    z-index: 2;
}

.image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    z-index: 2;
}

.blob {
    display: none;
}

/* Sections */
.section {
    padding: 6rem 0;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 4rem;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background-color: var(--accent-color);
    border-radius: 2px;
}

/* About */
#about {
    background-color: #0d0d0d;
}

#projects {
    background-color: #111111;
}

#contact {
    background-color: #0a0a0a;
    position: relative;
    overflow: hidden;
    padding-bottom: 15rem;
}

/* Add subtle gradients or patterns if preferred, but starting with distinct hex values */

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

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

.about-text p:last-child {
    margin-bottom: 0;
}

.values-wrapper {
    width: 100%;
    align-self: center;
    /* Explicitly center */
}

.values-title {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 2rem;
    background: linear-gradient(to right, var(--accent-color), #d946ef);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: 700;
    position: relative;
    padding-bottom: 15px;
}

.values-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background-color: var(--accent-color);
    border-radius: 2px;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.5rem;
}

.skill-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 1.5rem;
    border-radius: 15px;
    text-align: center;
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.skill-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
}

.skill-card h3 {
    color: var(--accent-color);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.skill-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Projects */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.project-image {
    height: 200px;
    background-color: #2a2a2a;
    position: relative;
    overflow: hidden;
}

.project-thumb {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.project-card:hover .project-thumb {
    transform: scale(1.1);
}

.placeholder-image {
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, #1a1a1a, #2a2a2a);
}

.project-info {
    padding: 2rem;
}

.project-info h3 {
    margin-bottom: 0.5rem;
    font-size: 1.5rem;
}

.project-info p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.project-tags {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.project-tags span {
    background: rgba(138, 43, 226, 0.1);
    color: var(--accent-color);
    padding: 0.3rem 0.8rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 500;
}

.btn-link {
    color: var(--text-color);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

/* Contact */
.contact-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.contact-content p {
    color: var(--text-secondary);
    font-size: 1.2rem;
    margin-bottom: 2.5rem;
}

.contact-form {
    max-width: 600px;
    margin: 0 auto 3rem auto;
    text-align: left;
}

.form-group {
    margin-bottom: 1.5rem;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 1rem;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    color: var(--text-color);
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 4px rgba(138, 43, 226, 0.1);
    background: rgba(255, 255, 255, 0.08);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
    color: var(--text-secondary);
}



.social-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 3rem;
}

.social-link {
    width: 60px;
    height: 60px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.3s ease;
}

.social-link:hover {
    transform: translateY(-5px) rotate(10deg);
    border-color: var(--accent-color);
    background: var(--accent-color);
}

.contact-form .btn-primary {
    display: block;
    margin: 0 auto;
    min-width: 200px;
}

.social-icon {
    width: 30px;
    height: 30px;
    object-fit: contain;
    transition: filter 0.3s ease;
}

/* Handle icon colors for light mode */
[data-theme="light"] .social-icon {
    filter: invert(1);
    /* Invert white icons to black */
}

[data-theme="light"] .social-link:hover .social-icon {
    filter: invert(0) brightness(2);
    /* Make them white on hover (since bg becomes purple) */
}

/* Footer */
.footer {
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid var(--card-border);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Animations */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s ease forwards;
}

.delay-100 {
    animation-delay: 0.1s;
}

.delay-200 {
    animation-delay: 0.2s;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-on-scroll {
    opacity: 0;
    transform: translateY(30px);
}

.fade-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

/* Media Queries */
@media (max-width: 968px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-description {
        margin: 0 auto 2.5rem auto;
        text-align: center;
    }

    .image-wrapper {
        margin: 0 auto;
        max-width: 350px;
    }

    .about-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
        z-index: 1001;
    }

    .nav-list {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background: var(--nav-bg);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: right 0.3s ease;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    }

    .nav-list.active {
        right: 0;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .values-title {
        font-size: 1.75rem;
        margin-bottom: 1.5rem;
    }
}

/* --- Math Challenge Section --- */
/* --- Math Challenge Section --- */
.math-challenge {
    background-color: #0F0F0F;
    padding: 6rem 1rem;
    position: relative;
    border-top: 1px solid var(--card-border);
    border-bottom: 1px solid var(--card-border);
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
}

/* Override global container to prevent width conflicts */
.math-challenge .container {
    width: 100%;
    max-width: 100%;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.math-card-container {
    width: min(90vw, 800px);
    margin: 0 auto;
    position: relative;
}

.math-card {
    width: 100%;
    position: relative;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    /* Essential for height animation */
    transition: height 0.4s ease-in-out;
}

/* Reusing these classes as the content containers */
.math-card-front,
.math-card-back {
    padding: 3rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    box-sizing: border-box;
    transition: opacity 0.3s ease-in-out;
    opacity: 1;
    /* Default visible */
}

/* Helper to hide content during swap or initially */
.math-content-hidden {
    display: none;
    opacity: 0;
}

.math-content-fading {
    opacity: 0;
}

/* Typography */
.math-problem-display {
    font-size: clamp(1.2rem, 3vw, 2.5rem);
    margin: 2rem 0;
    width: 100%;
    text-align: center;
    overflow-x: auto;
    /* Handle long equations */
}


/* Typography */
.math-problem-display {
    font-size: clamp(1.2rem, 3vw, 2.5rem);
    margin: 2rem 0;
    width: 100%;
    text-align: center;
    overflow-x: auto;
    scrollbar-width: none;
    /* Firefox */
    -ms-overflow-style: none;
    /* IE/Edge */
}

.math-problem-display::-webkit-scrollbar {
    display: none;
    /* Chrome/Safari */
}

.math-solution-text,
.math-solution-explanation {
    font-size: 1rem;
    color: var(--text-color);
    margin: 1rem 0;
    text-align: center;
}

.math-solution-latex {
    font-size: clamp(0.8rem, 2vw, 1.2rem);
    color: var(--text-color);
    margin: 1rem 0;
    width: 100%;
    text-align: center;
    overflow-x: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-color) var(--card-bg);
}

.math-solution-latex::-webkit-scrollbar {
    height: 6px;
}

.math-solution-latex::-webkit-scrollbar-track {
    background: var(--card-bg);
    border-radius: 4px;
}

.math-solution-latex::-webkit-scrollbar-thumb {
    background-color: var(--accent-color);
    border-radius: 4px;
}

/* Hint Text */
.reveal-hint {
    margin-top: auto;
    font-size: 0.85rem;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    opacity: 0.7;
    transition: opacity 0.3s;
}

.math-card:hover .reveal-hint {
    opacity: 1;
}