:root {
    /* Base Colors - Dark Theme (Default) */
    --bg-color: #0A1628; /* Deep Navy Blue */
    --bg-color-alt: #0D1E36;
    --text-main: #F8F9FA;
    --text-muted: #A0B0C8;
    
    /* Accent Colors */
    --accent-gold: #F4A820; /* Amber/Gold */
    --accent-gold-hover: #FFAF1A;
    --accent-blue: #3A86FF;
    
    /* UI Elements */
    --card-bg: rgba(255, 255, 255, 0.03);
    --card-border: rgba(255, 255, 255, 0.08);
    --input-bg: rgba(255, 255, 255, 0.05);
    
    /* Typography */
    --font-sans: 'Inter', sans-serif;
    --font-heading: 'Outfit', sans-serif;
    
    /* Transitions */
    --transition: 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* Light Theme Variables */
[data-theme="light"] {
    --bg-color: #F8F9FA;
    --bg-color-alt: #FFFFFF;
    --text-main: #1E293B;
    --text-muted: #475569;
    
    --card-bg: #FFFFFF;
    --card-border: #E2E8F0;
    --input-bg: #F1F5F9;
    
    --accent-gold: #D97706; /* Darker amber for readability on light */
    --accent-gold-hover: #B45309;
}

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

html {
    scroll-behavior: smooth;
}

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

/* --- Typography --- */
h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
}

/* --- Navigation --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
}

.navbar.scrolled {
    padding: 15px 0;
    background: rgba(10, 22, 40, 0.85); /* Navy transparent */
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--card-border);
}

[data-theme="light"] .navbar.scrolled {
    background: rgba(248, 249, 250, 0.85);
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-main);
}

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

.nav-links {
    list-style: none;
    display: flex;
    gap: 30px;
}

.nav-links a {
    color: var(--text-main);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-gold);
    transition: var(--transition);
}

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

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

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

.theme-toggle:hover {
    transform: scale(1.1) rotate(15deg);
    color: var(--accent-gold);
}

/* --- Utility Classes --- */
.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px 5%;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 50px;
    text-align: center;
    color: var(--text-main);
}

.section-title span {
    color: var(--accent-gold);
}

.text-center {
    text-align: center;
}

.w-100 {
    width: 100%;
}

.mb-2 { margin-bottom: 1rem; }
.mt-4 { margin-top: 2rem; }

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 32px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-family: var(--font-heading);
    transition: var(--transition);
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: var(--accent-gold);
    color: #0A1628; /* Always dark text for primary button */
    border: none;
    box-shadow: 0 4px 15px rgba(244, 168, 32, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    background: var(--accent-gold-hover);
    box-shadow: 0 8px 25px rgba(244, 168, 32, 0.6);
}

.btn-secondary {
    background: transparent;
    color: var(--text-main);
    border: 1px solid var(--text-main);
}

.btn-secondary:hover {
    background: var(--text-main);
    color: var(--bg-color);
    transform: translateY(-3px);
}

/* --- Hero Section --- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 100px 5% 0;
    position: relative;
    overflow: hidden;
}

.particles-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, rgba(58, 134, 255, 0.1) 0%, transparent 70%);
    z-index: 1;
}

.hero-content {
    z-index: 2;
    max-width: 800px;
}

.avatar-container {
    position: relative;
    width: 150px;
    height: 150px;
    margin: 0 auto 30px;
}

.profile-avatar {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    position: relative;
    z-index: 2;
    border: 4px solid var(--bg-color);
}

.avatar-glow {
    position: absolute;
    top: -5px;
    left: -5px;
    right: -5px;
    bottom: -5px;
    border-radius: 50%;
    background: linear-gradient(45deg, var(--accent-gold), var(--accent-blue));
    z-index: 1;
    animation: rotateGlow 4s linear infinite;
    filter: blur(8px);
    opacity: 0.8;
}

@keyframes rotateGlow {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.badge {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 30px;
    background: rgba(244, 168, 32, 0.1);
    border: 1px solid rgba(244, 168, 32, 0.3);
    color: var(--accent-gold);
    font-size: 0.9rem;
    margin-bottom: 20px;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.hero-title {
    font-size: clamp(3rem, 8vw, 5rem);
    margin-bottom: 10px;
    color: var(--text-main);
}

.hero-title span {
    color: var(--accent-gold);
}

.hero-subtitle {
    font-size: clamp(1.2rem, 4vw, 2rem);
    color: var(--text-muted);
    margin-bottom: 25px;
    min-height: 2.5rem;
}

.cursor {
    animation: blink 1s infinite;
    color: var(--accent-gold);
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

.stats-row {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
    margin-bottom: 30px;
    font-weight: 500;
    color: var(--text-main);
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.stat-item i {
    color: var(--accent-gold);
}

.stat-divider {
    width: 2px;
    height: 15px;
    background-color: var(--card-border);
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 40px;
    max-width: 650px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
}

/* --- About Section --- */
.about {
    background-color: var(--bg-color-alt);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: start;
}

.about-text p {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-bottom: 20px;
}

.edu-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 25px;
    display: flex;
    gap: 20px;
    transition: var(--transition);
}

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

.edu-icon {
    font-size: 2rem;
    color: var(--accent-gold);
}

.edu-info h3 {
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.edu-major {
    color: var(--text-main);
    font-weight: 500;
    margin-bottom: 5px;
}

.edu-meta {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.cert-tags {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.cert-tag {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(58, 134, 255, 0.1);
    color: var(--text-main);
    padding: 12px 20px;
    border-radius: 8px;
    border: 1px solid rgba(58, 134, 255, 0.2);
    font-weight: 500;
}

.cert-tag i {
    color: var(--accent-blue);
}

/* --- Skills Section --- */
.skills-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 50px;
}

.skill-group-title {
    font-size: 1.5rem;
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--accent-gold);
}

.skill-item {
    margin-bottom: 25px;
}

.skill-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-weight: 500;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background-color: var(--card-bg);
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--card-border);
}

.progress {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-gold));
    width: 0; /* Set by JS */
    border-radius: 10px;
    transition: width 1.5s ease-in-out;
}

.soft-skills-wrapper {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.soft-skill-badge {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 12px 20px;
    border-radius: 30px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.soft-skill-badge:hover {
    border-color: var(--accent-gold);
    color: var(--accent-gold);
    transform: translateY(-3px);
}

/* --- Experience Timeline --- */
.experience {
    background-color: var(--bg-color-alt);
}

.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 2px;
    background-color: var(--card-border);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -1px;
}

.timeline-item {
    padding: 10px 40px;
    position: relative;
    background-color: inherit;
    width: 50%;
    margin-bottom: 40px;
}

.timeline-item.left {
    left: 0;
}

.timeline-item.right {
    left: 50%;
}

.timeline-icon {
    position: absolute;
    width: 40px;
    height: 40px;
    right: -20px;
    background-color: var(--bg-color);
    border: 3px solid var(--accent-gold);
    border-radius: 50%;
    top: 15px;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-gold);
    font-size: 1.1rem;
}

.timeline-item.right .timeline-icon {
    left: -20px;
}

.timeline-content {
    padding: 25px;
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    position: relative;
    border-radius: 12px;
    transition: var(--transition);
}

.timeline-content:hover {
    transform: translateY(-5px);
    border-color: var(--accent-gold);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.timeline-date {
    display: inline-block;
    padding: 4px 12px;
    background-color: rgba(244, 168, 32, 0.1);
    color: var(--accent-gold);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.timeline-content h3 {
    font-size: 1.3rem;
    margin-bottom: 5px;
}

.timeline-content h4 {
    font-size: 1rem;
    color: var(--accent-blue);
    margin-bottom: 15px;
    font-family: var(--font-sans);
    font-weight: 500;
}

.timeline-content p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 15px;
}

.timeline-tags {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.timeline-tags span {
    font-size: 0.8rem;
    padding: 4px 10px;
    background-color: var(--bg-color);
    border: 1px solid var(--card-border);
    border-radius: 4px;
    color: var(--text-muted);
}

/* --- Projects Section --- */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent-gold);
    box-shadow: 0 15px 30px rgba(0,0,0,0.15);
}

.card-image {
    height: 220px;
    background-size: cover;
    background-position: center;
    position: relative;
    border-bottom: 1px solid var(--card-border);
}

.card-overlay {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(10, 22, 40, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

.project-card:hover .card-overlay {
    opacity: 1;
}

.view-btn {
    background: var(--accent-gold);
    color: #0A1628;
    padding: 10px 20px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    transform: translateY(20px);
    transition: var(--transition);
}

.project-card:hover .view-btn {
    transform: translateY(0);
}

.card-content {
    padding: 25px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.project-title {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: var(--text-main);
}

.project-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 20px;
    flex-grow: 1;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.project-tags span {
    font-size: 0.8rem;
    padding: 4px 10px;
    background: rgba(244, 168, 32, 0.1);
    color: var(--accent-gold);
    border-radius: 4px;
}

/* --- Contact Section --- */
.contact {
    background-color: var(--bg-color-alt);
    padding-bottom: 100px;
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 50px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 40px;
}

.info-item {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
}

.info-item i {
    font-size: 1.5rem;
    color: var(--accent-gold);
    margin-top: 5px;
}

.info-item h4 {
    font-size: 1.1rem;
    margin-bottom: 5px;
}

.info-item p, .info-item a {
    color: var(--text-muted);
    text-decoration: none;
}

.social-links-new {
    display: flex;
    gap: 15px;
    margin-top: 40px;
}

.social-btn {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: var(--input-bg);
    border: 1px solid var(--card-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-main);
    font-size: 1.2rem;
    text-decoration: none;
    transition: var(--transition);
}

.social-btn:hover {
    background: var(--accent-gold);
    color: #0A1628;
    transform: translateY(-5px);
}

/* Form Styles */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.input-group {
    position: relative;
}

.input-group input,
.input-group textarea {
    width: 100%;
    padding: 15px 20px;
    background: var(--input-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
    resize: vertical;
}

.input-group label {
    position: absolute;
    left: 20px;
    top: 15px;
    color: var(--text-muted);
    transition: var(--transition);
    pointer-events: none;
}

.input-group input:focus,
.input-group textarea:focus,
.input-group input:not(:placeholder-shown),
.input-group textarea:not(:placeholder-shown) {
    border-color: var(--accent-gold);
    background: var(--bg-color);
}

.input-group input:focus ~ label,
.input-group textarea:focus ~ label,
.input-group input:not(:placeholder-shown) ~ label,
.input-group textarea:not(:placeholder-shown) ~ label {
    top: -10px;
    left: 15px;
    font-size: 0.8rem;
    background: var(--bg-color);
    padding: 0 5px;
    color: var(--accent-gold);
}

/* --- Footer --- */
footer {
    border-top: 1px solid var(--card-border);
    padding: 30px 0;
    text-align: center;
    background-color: var(--bg-color);
}

footer p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin: 5px 0;
}

/* Back to top button */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--accent-gold);
    color: #0A1628;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
}

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

#back-to-top:hover {
    transform: translateY(-5px);
    background: var(--accent-gold-hover);
}

/* --- Animations --- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.5, 0, 0, 1);
}

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

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }

.fade-in-up {
    animation: fadeInUp 1s cubic-bezier(0.5, 0, 0, 1) forwards;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- Responsive --- */
@media (max-width: 992px) {
    .about-grid, .skills-grid {
        grid-template-columns: 1fr;
    }
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .timeline::after {
        left: 31px;
    }
    
    .timeline-item {
        width: 100%;
        padding-left: 70px;
        padding-right: 0;
    }
    
    .timeline-item.right {
        left: 0;
    }
    
    .timeline-item.left::after, .timeline-item.right::after {
        left: 15px;
    }
    
    .timeline-item.right .timeline-icon, .timeline-item.left .timeline-icon {
        left: 11px;
    }
}