/* ==========================================================================
   CSS VARIABLES - DESIGN SYSTEM
   ========================================================================== */
   :root {
    /* Colors */
    --bg-primary: #08080c;
    --bg-secondary: #0d0d14;
    --surface: rgba(255, 255, 255, 0.03);
    --surface-hover: rgba(255, 255, 255, 0.06);
    --text-primary: #f8f9fa;
    --text-secondary: #adb5bd;
    --text-muted: #6c757d;
    --accent: #8b5cf6;
    --accent-secondary: #3b82f6;
    --border: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);
    
    /* Gradients */
    --gradient-accent: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    --gradient-glow: radial-gradient(circle at center, rgba(139, 92, 246, 0.15), transparent 70%);

    /* Radii */
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-full: 9999px;

    /* Spacing */
    --container: 1200px;
    --section-spacing: 100px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
    font-family: 'Inter', sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-primary);
}

body {
    overflow-x: hidden;
    line-height: 1.6;
    position: relative;
}

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

ul {
    list-style: none;
}

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

button {
    cursor: pointer;
    font-family: inherit;
    border: none;
    background: none;
    color: inherit;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.2);
    border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

/* Selection */
::selection {
    background: var(--accent);
    color: #fff;
}

/* ==========================================================================
   LAYOUT & UTILITIES
   ========================================================================== */
.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: var(--section-spacing) 0;
    position: relative;
    z-index: 10;
}

.pt-0 { padding-top: 0 !important; }
.mt-4 { margin-top: 1.5rem !important; }
.mt-5 { margin-top: 3rem !important; }
.w-100 { width: 100% !important; }
.text-center { text-align: center !important; }
.hidden { display: none !important; }
.ms-2 { margin-left: 0.5rem !important; }

/* Background Canvas */
#particles-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* Gradient Text */
.gradient-text {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

/* Section Header */
.section-header {
    margin-bottom: 3rem;
}

.section-title {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.section-line {
    height: 3px;
    width: 60px;
    background: var(--gradient-accent);
    border-radius: var(--radius-full);
    margin-top: 10px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.btn-primary {
    background: var(--gradient-accent);
    color: #fff;
    border: 1px solid transparent;
}

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

.btn-outline {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-primary);
}

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

/* Glass Card */
.glass-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.glass-card:hover {
    background: var(--surface-hover);
    border-color: var(--border-hover);
}

/* Scroll Progress */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: var(--gradient-accent);
    width: 0%;
    z-index: 9999;
    transition: width 0.1s ease;
}

/* ==========================================================================
   HEADER & NAVBAR
   ========================================================================== */
#header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: all var(--transition-normal);
    padding: 1.5rem 0;
}

#header.scrolled {
    padding: 1rem 0;
    background: rgba(8, 8, 12, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 0.5rem 0;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0%;
    height: 2px;
    background: var(--gradient-accent);
    transition: width var(--transition-normal);
    border-radius: var(--radius-full);
}

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    z-index: 1001;
}

.hamburger span {
    display: block;
    width: 25px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-normal);
}

.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 100px;
    position: relative;
}

.hero-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60vw;
    height: 60vw;
    background: var(--gradient-glow);
    border-radius: 50%;
    filter: blur(100px);
    z-index: -1;
    pointer-events: none;
}

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

.availability-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 24px;
}

.status-dot {
    width: 8px;
    height: 8px;
    background-color: #10b981;
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(16, 185, 129, 0.5);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
    70% { box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
    100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1rem;
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 1.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    max-width: 600px;
}

.hero-tech-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 2.5rem;
}

.tech-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.hero-cta {
    display: flex;
    gap: 16px;
}

/* ==========================================================================
   ABOUT ME SECTION
   ========================================================================== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
    align-items: start;
}

.avatar-container {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    aspect-ratio: 1;
}

.avatar-glow {
    position: absolute;
    inset: 0;
    background: var(--gradient-accent);
    opacity: 0.2;
    filter: blur(30px);
}

.avatar-placeholder {
    width: 100%;
    height: 100%;
    background: var(--surface);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 5rem;
    color: var(--text-secondary);
    border-radius: var(--radius-lg);
    position: relative;
    z-index: 1;
}

.profile-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

.profile-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.profile-item h4 {
    font-size: 1rem;
    font-weight: 500;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

/* ==========================================================================
   STATS SECTION
   ========================================================================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.stat-card {
    text-align: center;
    padding: 2rem;
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 1px;
}

/* ==========================================================================
   SKILLS SECTION
   ========================================================================== */
.skills-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 2rem;
}

.filter-btn {
    padding: 6px 16px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: all var(--transition-normal);
}

.filter-btn:hover, .filter-btn.active {
    background: var(--surface);
    color: var(--text-primary);
    border-color: var(--accent);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.skill-card {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.skill-header {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.skill-icon {
    width: 45px;
    height: 45px;
    border-radius: var(--radius-sm);
    background: rgba(255,255,255,0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--accent);
}

.skill-title h3 {
    font-size: 1.1rem;
    margin-bottom: 2px;
}

.skill-title span {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

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

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: auto;
}

.tag {
    font-size: 0.75rem;
    padding: 4px 10px;
    background: rgba(255,255,255,0.05);
    border-radius: var(--radius-full);
    color: var(--text-muted);
}

/* ==========================================================================
   TECH STACK LOGOS
   ========================================================================== */
.tech-stack-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 2rem;
    text-align: center;
}

.tech-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 1.5rem;
    transition: transform var(--transition-normal);
}

.tech-item:hover {
    transform: translateY(-5px);
}

.tech-item i {
    font-size: 3rem;
    color: var(--text-secondary);
    transition: color var(--transition-normal);
}

.tech-item:hover i {
    color: var(--accent);
    filter: drop-shadow(0 0 10px rgba(139, 92, 246, 0.5));
}

.tech-item span {
    font-size: 0.9rem;
    font-weight: 500;
}

/* ==========================================================================
   SERVICES SECTION
   ========================================================================== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.service-card {
    padding: 2rem;
    position: relative;
    overflow: hidden;
}

.service-number {
    position: absolute;
    top: -10px;
    right: 10px;
    font-size: 5rem;
    font-weight: 800;
    color: rgba(255,255,255,0.02);
    z-index: 0;
}

.service-icon {
    font-size: 2rem;
    color: var(--accent);
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
}

.service-card h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
}

.service-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    position: relative;
    z-index: 1;
}

/* ==========================================================================
   PROJECTS SECTION
   ========================================================================== */
.projects-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.search-box {
    position: relative;
    flex: 1;
    max-width: 400px;
}

.search-box i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.search-box input {
    width: 100%;
    padding: 0.8rem 1rem 0.8rem 2.5rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-primary);
    font-family: inherit;
    outline: none;
}

.search-box input:focus {
    border-color: var(--accent);
}

.sort-box select {
    padding: 0.8rem 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-primary);
    font-family: inherit;
    outline: none;
    cursor: pointer;
}

.projects-count {
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

.project-card {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    cursor: pointer;
}

.project-img-wrapper {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
    border-bottom: 1px solid var(--border);
}

.project-thumbnail {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255,255,255,0.05), rgba(255,255,255,0.01));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--text-secondary);
    transition: transform var(--transition-slow);
}

.project-card:hover .project-thumbnail {
    transform: scale(1.05);
}

.project-category {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(4px);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 500;
}

.project-content {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.project-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.project-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.project-footer {
    margin-top: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.project-year {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--border-hover);
}

/* ==========================================================================
   JOURNEY / TIMELINE SECTION
   ========================================================================== */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 15px;
    height: 100%;
    width: 2px;
    background: var(--border);
}

.timeline-item {
    position: relative;
    padding-left: 50px;
    margin-bottom: 3rem;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: 8px;
    top: 0;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 0 4px var(--bg-primary);
}

.timeline-year {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.timeline-content h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.timeline-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ==========================================================================
   EDUCATION
   ========================================================================== */
.education-card {
    display: flex;
    gap: 2rem;
    padding: 2.5rem;
    align-items: center;
}

.edu-icon {
    font-size: 3rem;
    color: var(--accent);
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.02);
    border-radius: 50%;
}

.edu-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.edu-major {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

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

/* ==========================================================================
   CONTACT SECTION
   ========================================================================== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 4rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.c-icon {
    font-size: 1.5rem;
    color: var(--accent);
}

.c-text h4 {
    margin-bottom: 4px;
}

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

.social-links {
    display: flex;
    gap: 1rem;
}

.social-btn {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: var(--surface);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.social-btn:hover {
    background: var(--accent);
    border-color: var(--accent);
    transform: translateY(-3px);
}

.contact-form-wrapper form {
    padding: 2.5rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: rgba(0,0,0,0.2);
    color: var(--text-primary);
    font-family: inherit;
    outline: none;
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent);
}

.form-message {
    margin-top: 1rem;
    text-align: center;
    font-size: 0.9rem;
}

.form-message.success {
    color: #10b981;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer {
    border-top: 1px solid var(--border);
    padding: 4rem 0 2rem;
    background: rgba(0,0,0,0.3);
}

.footer-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

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

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

.footer-copyright {
    width: 100%;
    text-align: center;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ==========================================================================
   MODAL
   ========================================================================== */
.modal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.8);
    backdrop-filter: blur(5px);
}

.modal-content {
    position: relative;
    width: 90%;
    max-width: 900px;
    max-height: 90vh;
    overflow-y: auto;
    z-index: 2001;
    transform: translateY(20px) scale(0.95);
    transition: all var(--transition-normal);
}

.modal.active .modal-content {
    transform: translateY(0) scale(1);
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(0,0,0,0.5);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    z-index: 10;
}

.modal-close:hover {
    background: var(--surface-hover);
}

.modal-body {
    padding: 2rem;
}

/* Modal Internal Layout styles handle by JS generation */
.modal-header {
    margin-bottom: 2rem;
}
.modal-title {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}
.modal-meta {
    display: flex;
    gap: 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    flex-wrap: wrap;
}
.modal-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
}
.modal-section {
    margin-bottom: 1.5rem;
}
.modal-section h4 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}
.modal-section p, .modal-section ul {
    color: var(--text-secondary);
    font-size: 0.95rem;
}
.modal-section ul {
    padding-left: 1.2rem;
}
.modal-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 1rem;
}
.modal-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

/* ==========================================================================
   BACK TO TOP
   ========================================================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    z-index: 999;
}

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

/* ==========================================================================
   ANIMATIONS (Intersection Observer)
   ========================================================================== */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

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

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 1199px) {
    .hero-title { font-size: 3.5rem; }
    .about-grid, .contact-grid { gap: 2rem; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 991px) {
    .about-grid { grid-template-columns: 1fr; }
    .avatar-container { max-width: 400px; margin: 0 auto; }
    .contact-grid { grid-template-columns: 1fr; }
    .modal-grid { grid-template-columns: 1fr; }
    
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background: rgba(8, 8, 12, 0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: right var(--transition-normal);
        border-left: 1px solid var(--border);
    }

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

    .hamburger {
        display: flex;
    }
}

@media (max-width: 767px) {
    :root {
        --section-spacing: 60px;
    }
    .hero-title { font-size: 2.5rem; }
    .hero-subtitle { font-size: 1.2rem; }
    .stats-grid { grid-template-columns: 1fr; }
    .projects-grid, .skills-grid, .services-grid { grid-template-columns: 1fr; }
    .projects-controls { flex-direction: column; align-items: stretch; }
    .search-box { max-width: 100%; }
    .education-card { flex-direction: column; text-align: center; }
    .edu-tags { justify-content: center; }
    .profile-details { grid-template-columns: 1fr; }
}