/* ==========================================================================
   CSS VARIABLES & DESIGN SYSTEM (DARK/LIGHT HARMONY)
   ========================================================================== */
:root {
    --primary: #2563EB;
    --secondary: #1E40AF;
    --accent: #38BDF8;
    --background: #F8FAFC;
    --card-bg: #FFFFFF;
    --text: #1E293B;
    --text-light: #64748B;
    --border: rgba(226, 232, 240, 0.8);
    --border-hover: rgba(37, 99, 235, 0.2);
    --footer-bg: #0F172A;
    --footer-text: #F8FAFC;
    --header-bg: rgba(248, 250, 252, 0.75);
    --menu-overlay-bg: rgba(15, 23, 42, 0.4);
    
    --transition-speed: 0.3s;
    --transition-bezier: cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm: 8px;
    
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.03), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
}

body.dark-mode {
    --background: #0F172A;
    --card-bg: #1E293B;
    --text: #F8FAFC;
    --text-light: #94A3B8;
    --border: rgba(51, 65, 85, 0.5);
    --border-hover: rgba(56, 189, 248, 0.3);
    --footer-bg: #030712;
    --header-bg: rgba(15, 23, 42, 0.75);
    --menu-overlay-bg: rgba(3, 7, 18, 0.6);
}

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

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background);
    color: var(--text);
    line-height: 1.625;
    transition: background-color var(--transition-speed) var(--transition-bezier), color var(--transition-speed) var(--transition-bezier);
    overflow-x: hidden;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

/* Accessibility Focus State Outlines */
a:focus-visible, button:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 4px;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-speed) var(--transition-bezier);
}

a:hover {
    color: var(--secondary);
}

ul {
    list-style: none;
}

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section-padding {
    padding: clamp(5rem, 8vw, 8rem) 0;
}

.bg-alt {
    background-color: rgba(37, 99, 235, 0.02);
}

body.dark-mode .bg-alt {
    background-color: rgba(30, 41, 59, 0.3);
}

/* Section Header Typography */
.section-title {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: 700;
    margin-bottom: clamp(3rem, 6vw, 4.5rem);
    text-align: center;
    position: relative;
    padding-bottom: 1.25rem;
    letter-spacing: -0.025em;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 4px;
    background-color: var(--primary);
    border-radius: 2px;
}

/* Scroll Progress Bar */
#scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background-color: var(--accent);
    z-index: 1010;
    width: 0%;
}

/* ==========================================================================
   PREMIUM BUTTON SYSTEM
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.75rem;
    font-weight: 500;
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-speed) var(--transition-bezier);
    cursor: pointer;
    border: 1.5px solid transparent;
    gap: 0.5rem;
    box-shadow: var(--shadow-sm);
}

.btn-primary {
    background-color: var(--primary);
    color: #FFFFFF;
}

.btn-primary:hover, .btn-primary:focus {
    background-color: var(--secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    color: #FFFFFF;
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary);
    border-color: var(--primary);
}

.btn-secondary:hover, .btn-secondary:focus {
    background-color: rgba(37, 99, 235, 0.04);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

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

/* ==========================================================================
   GLASSMORPHISM HEADER & NAVIGATION
   ========================================================================== */
#site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: var(--header-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    transition: background-color var(--transition-speed) var(--transition-bezier), 
                border-color var(--transition-speed) var(--transition-bezier), 
                box-shadow var(--transition-speed) var(--transition-bezier);
}

#site-header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.logo {
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--primary);
    text-decoration: none;
    transition: transform var(--transition-speed) var(--transition-bezier);
}

.logo:hover {
    transform: scale(1.05);
}

/* Center Desktop Navigation Links */
#nav-menu {
    display: block;
}

.nav-links {
    display: flex;
    gap: 1.75rem;
    align-items: center;
}

.nav-link {
    color: var(--text-light);
    font-weight: 500;
    font-size: 0.925rem;
    position: relative;
    padding: 0.5rem 0;
    transition: color var(--transition-speed) var(--transition-bezier);
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary);
    transition: width var(--transition-speed) var(--transition-bezier);
}

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

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

#theme-toggle {
    background: none;
    border: none;
    color: var(--text);
    cursor: pointer;
    font-size: 1.1rem;
    padding: 8px;
    border-radius: 50%;
    transition: background-color var(--transition-speed) var(--transition-bezier);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
}

#theme-toggle:hover, #theme-toggle:focus {
    background-color: rgba(37, 99, 235, 0.08);
}

/* Hamburger Menu button */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 22px;
    height: 16px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1002;
}

.hamburger .bar {
    width: 100%;
    height: 2px;
    background-color: var(--text);
    border-radius: 2px;
    transition: transform var(--transition-speed) var(--transition-bezier), 
                opacity var(--transition-speed) var(--transition-bezier),
                background-color var(--transition-speed) var(--transition-bezier);
}

/* ==========================================================================
   LEFT SLIDE-OUT MOBILE MENU & BACKDROP OVERLAY
   ========================================================================== */
.menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: var(--menu-overlay-bg);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 998;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-speed) var(--transition-bezier);
}

.menu-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 110px 0 60px 0;
    position: relative;
    overflow: hidden;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 3rem;
    align-items: center;
}

.hero-content {
    max-width: 640px;
}

.hero-content .subtitle {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary);
    display: block;
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.075em;
}

.hero-title {
    font-size: clamp(2.25rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 1rem;
    letter-spacing: -0.03em;
}

.hero-subtitle {
    font-size: clamp(1.15rem, 2.5vw, 1.45rem);
    font-weight: 500;
    color: var(--text-light);
    margin-bottom: 1.75rem;
    height: 36px;
    display: flex;
    align-items: center;
}

.hero-paragraph {
    font-size: clamp(0.975rem, 1.5vw, 1.05rem);
    color: var(--text-light);
    margin-bottom: 2.25rem;
    line-height: 1.7;
}

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

/* Animated Floating Node Architecture */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.visual-canvas {
    width: 320px;
    height: 320px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.05) 0%, transparent 70%);
    border-radius: 50%;
    position: relative;
}

.tech-nodes {
    width: 100%;
    height: 100%;
    position: relative;
}

.node {
    position: absolute;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-speed) var(--transition-bezier);
}

.central-node {
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 76px;
    height: 76px;
    background-color: var(--primary);
    color: #FFFFFF;
    font-size: 1.75rem;
    z-index: 2;
}

.float-node {
    width: 46px;
    height: 46px;
    background-color: var(--card-bg);
    color: var(--primary);
    font-size: 1.1rem;
    border: 1px solid var(--border);
    animation: floating-anim 6s infinite ease-in-out;
}

.float-node::after {
    content: attr(data-tech);
    position: absolute;
    bottom: -22px;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-light);
    white-space: nowrap;
}

.fn-1 { top: 15%; left: 15%; animation-delay: 0s; }
.fn-2 { top: 12%; right: 15%; animation-delay: 1.2s; }
.fn-3 { bottom: 20%; left: 10%; animation-delay: 2.4s; }
.fn-4 { bottom: 18%; right: 12%; animation-delay: 3.6s; }
.fn-5 { top: 52%; right: -2%; animation-delay: 4.8s; }

@keyframes floating-anim {
    0% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-10px) rotate(3deg); }
    100% { transform: translateY(0px) rotate(0deg); }
}

/* ==========================================================================
   ABOUT SECTION
   ========================================================================== */
.about-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: clamp(3rem, 6vw, 5rem);
    align-items: center;
}

.about-content p {
    margin-bottom: 1.5rem;
    color: var(--text-light);
    font-size: 1.025rem;
    line-height: 1.7;
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.highlight-item {
    display: flex;
    gap: 1.25rem;
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    padding: 1.75rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-speed) var(--transition-bezier), 
                box-shadow var(--transition-speed) var(--transition-bezier);
}

.highlight-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.hl-icon {
    font-size: 1.35rem;
    color: var(--primary);
    margin-top: 3px;
    flex-shrink: 0;
}

.highlight-item h4 {
    font-size: 1.05rem;
    margin-bottom: 0.35rem;
}

.highlight-item p {
    font-size: 0.88rem;
    color: var(--text-light);
    line-height: 1.5;
}

/* ==========================================================================
   EXPERIENCE SECTION (VERTICAL TIMELINE DESIGN)
   ========================================================================== */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding: 10px 0;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 2px;
    background-color: var(--border);
    top: 0;
    bottom: 0;
    left: 20px;
}

.timeline-item {
    position: relative;
    margin-bottom: 2.5rem;
}

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

.timeline-badge {
    position: absolute;
    width: 40px;
    height: 40px;
    left: 0;
    top: 15px;
    border-radius: 50%;
    background-color: var(--primary);
    color: #FFFFFF;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2;
}

.timeline-card {
    margin-left: 60px;
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    padding: 2rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-speed) var(--transition-bezier), 
                box-shadow var(--transition-speed) var(--transition-bezier);
}

.timeline-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.time-period {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary);
    background-color: rgba(37, 99, 235, 0.08);
    padding: 0.3rem 0.85rem;
    border-radius: 30px;
    display: inline-block;
    margin-bottom: 1rem;
}

.timeline-role {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    letter-spacing: -0.015em;
}

.timeline-company {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-light);
    margin-bottom: 1.25rem;
}

.timeline-desc {
    font-size: 0.925rem;
    color: var(--text-light);
    line-height: 1.6;
}

.experience-bullets {
    margin-top: 0.75rem;
    padding-left: 1.25rem;
    list-style-type: disc;
    font-size: 0.9rem;
    color: var(--text-light);
}

.experience-bullets li {
    margin-bottom: 0.6rem;
}

.experience-bullets li:last-child {
    margin-bottom: 0;
}

/* ==========================================================================
   SKILLS SECTION (EQUAL-HEIGHT GRID DESIGN)
   ========================================================================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.75rem;
}

.skills-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2.25rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-speed) var(--transition-bezier), 
                border-color var(--transition-speed) var(--transition-bezier),
                box-shadow var(--transition-speed) var(--transition-bezier);
}

.skills-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-lg);
}

.skills-card h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.skills-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem;
}

.skill-tag {
    background-color: rgba(37, 99, 235, 0.03);
    color: var(--text);
    padding: 0.5rem 1rem;
    border-radius: 30px;
    font-size: 0.85rem;
    font-weight: 500;
    border: 1.5px solid var(--border);
    transition: all var(--transition-speed) var(--transition-bezier);
}

body.dark-mode .skill-tag {
    background-color: rgba(56, 189, 248, 0.03);
}

.skill-tag:hover {
    background-color: var(--primary);
    color: #FFFFFF;
    border-color: var(--primary);
    transform: translateY(-1.5px);
}

.full-width-card {
    grid-column: span 2;
}

/* ==========================================================================
   EDUCATION & ACADEMIC BACKPLANE
   ========================================================================== */
.education-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.75rem;
}

.education-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2.25rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    transition: transform var(--transition-speed) var(--transition-bezier), 
                border-color var(--transition-speed) var(--transition-bezier),
                box-shadow var(--transition-speed) var(--transition-bezier);
}

.education-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-lg);
}

.edu-icon {
    font-size: 1.5rem;
    color: var(--primary);
    background-color: rgba(37, 99, 235, 0.05);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.edu-date {
    font-size: 0.78rem;
    color: var(--primary);
    font-weight: 600;
    display: block;
    margin-bottom: 0.25rem;
    text-transform: uppercase;
}

.education-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 0.35rem;
}

.edu-degree {
    font-size: 0.88rem;
    color: var(--text-light);
    line-height: 1.5;
}

/* ==========================================================================
   CERTIFICATES
   ========================================================================== */
.certificates-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.75rem;
}

.cert-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2.25rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: transform var(--transition-speed) var(--transition-bezier), 
                border-color var(--transition-speed) var(--transition-bezier),
                box-shadow var(--transition-speed) var(--transition-bezier);
}

.cert-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-lg);
}

.cert-icon {
    font-size: 1.75rem;
    color: var(--accent);
    margin-bottom: 1.25rem;
}

.cert-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 0.5rem;
}

.cert-issuer {
    font-size: 0.825rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 0.85rem;
    text-transform: uppercase;
}

.cert-desc {
    font-size: 0.85rem;
    color: var(--text-light);
    line-height: 1.6;
}

/* ==========================================================================
   CONTACT SECTION (MINIMAL CENTERED LAYOUT)
   ========================================================================== */
.contact-container {
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
}

.info-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    padding: 3rem 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.info-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    text-align: center;
}

.info-tagline {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 2.25rem;
    text-align: center;
}

.info-list {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    margin-bottom: 2.5rem;
}

.info-item {
    display: flex;
    gap: 1.25rem;
    align-items: center;
    background-color: rgba(37, 99, 235, 0.015);
    padding: 1.25rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
}

.info-icon {
    width: 42px;
    height: 42px;
    background-color: rgba(37, 99, 235, 0.05);
    color: var(--primary);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1rem;
    flex-shrink: 0;
}

.info-text span {
    display: block;
    font-size: 0.75rem;
    color: var(--text-light);
    text-transform: uppercase;
    font-weight: 600;
}

.info-text a, .info-text p {
    font-size: 0.925rem;
    color: var(--text);
    font-weight: 500;
}

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

.social-connect h4 {
    font-size: 0.9rem;
    margin-bottom: 1.25rem;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.social-links {
    display: flex;
    gap: 1.25rem;
    justify-content: center;
}

.social-link {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--card-bg);
    color: var(--text-light);
    border: 1px solid var(--border);
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all var(--transition-speed) var(--transition-bezier);
}

.social-link:hover, .social-link:focus {
    color: #FFFFFF;
    background-color: var(--primary);
    border-color: var(--primary);
    transform: translateY(-2.5px);
    box-shadow: var(--shadow-md);
    outline: none;
}

/* ==========================================================================
   FOOTER SECTION
   ========================================================================== */
.site-footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
    padding: clamp(3.5rem, 5vw, 5rem) 0 1.5rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.04);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3.5rem;
}

.footer-brand .logo {
    display: inline-block;
    margin-bottom: 1rem;
}

.footer-brand p {
    font-size: 0.85rem;
    opacity: 0.7;
    max-width: 320px;
    line-height: 1.6;
}

.footer-links h4, .footer-socials h4 {
    font-size: 0.9rem;
    margin-bottom: 1.25rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.footer-links a {
    color: var(--footer-text);
    opacity: 0.65;
    font-size: 0.85rem;
    transition: all var(--transition-speed) var(--transition-bezier);
}

.footer-links a:hover, .footer-links a:focus {
    opacity: 1;
    color: var(--primary);
    outline: none;
    padding-left: 4px;
}

.footer-socials .social-links {
    justify-content: flex-start;
}

.footer-socials .social-link {
    background-color: rgba(255, 255, 255, 0.03);
    border-color: rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.7);
}

.footer-socials .social-link:hover, .footer-socials .social-link:focus {
    background-color: var(--primary);
    border-color: var(--primary);
    color: #FFFFFF;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding-top: 1.5rem;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8rem;
    opacity: 0.5;
}

/* ==========================================================================
   BACK TO TOP BUTTON
   ========================================================================== */
.back-to-top-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    background-color: var(--primary);
    color: #FFFFFF;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 99;
    box-shadow: var(--shadow-md);
    transition: background-color var(--transition-speed) var(--transition-bezier), 
                transform var(--transition-speed) var(--transition-bezier);
}

.back-to-top-btn:hover {
    background-color: var(--secondary);
    transform: translateY(-3px);
}

/* ==========================================================================
   ACCESSIBILITY INTERACTION (ANIMATIONS & TRANSITIONS RESETS)
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    .float-node {
        animation: none !important;
    }
}

/* Structural Fade Animations */
.fade-in-up {
    animation: fadeInUpAnim 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.fade-in-right {
    animation: fadeInRightAnim 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes fadeInUpAnim {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInRightAnim {
    from { opacity: 0; transform: translateX(20px); }
    to { opacity: 1; transform: translateX(0); }
}

.reveal-fade-up {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.7s var(--transition-bezier), transform 0.7s var(--transition-bezier);
}

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

/* ==========================================================================
   STRICT RESPONSIVENESS OVERRIDES
   ========================================================================== */
@media (max-width: 1024px) {
    .education-grid, .certificates-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2.5rem;
    }

    .hero-paragraph {
        margin-left: auto;
        margin-right: auto;
    }

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

    .hero-visual {
        order: -1;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .skills-grid {
        grid-template-columns: 1fr;
    }

    .full-width-card {
        grid-column: span 1;
    }

    /* Redesigned Mobile Burger Icon Trigger */
    .hamburger {
        display: flex;
    }

    /* Clean left slide-out mobile menu panel */
    #nav-menu {
        position: fixed;
        top: 0;
        left: -280px;
        width: 280px;
        height: 100vh;
        background-color: var(--card-bg);
        border-right: 1px solid var(--border);
        box-shadow: var(--shadow-lg);
        z-index: 1001;
        transition: transform var(--transition-speed) var(--transition-bezier);
        display: block;
        padding: 3rem 2rem;
    }

    #nav-menu.open {
        transform: translateX(280px);
    }

    .nav-links {
        flex-direction: column;
        align-items: flex-start;
        gap: 1.5rem;
    }

    .nav-link {
        font-size: 1.05rem;
        width: 100%;
        display: block;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2.5rem;
        text-align: center;
    }

    .footer-brand p {
        margin: 0 auto;
    }

    .footer-socials .social-links {
        justify-content: center;
    }
}

@media (max-width: 576px) {
    .education-grid, .certificates-grid {
        grid-template-columns: 1fr;
    }

    .timeline::after {
        left: 15px;
    }

    .timeline-badge {
        width: 32px;
        height: 32px;
        left: 0;
    }

    .timeline-card {
        margin-left: 45px;
        padding: 1.5rem;
    }
}