/* ===== CSS VARIABLES ===== */
:root {
    /* Colors - Light Theme */
    --bg-primary: #0a0e27;
    --bg-secondary: #12182e;
    --bg-tertiary: #1a2237;
    --text-primary: #e0e6ed;
    --text-secondary: #8892b0;
    --accent-primary: #00f5ff;
    --accent-secondary: #00d9ff;
    --accent-glow: rgba(0, 245, 255, 0.3);
    --accent-gradient: linear-gradient(135deg, #00f5ff 0%, #00d9ff 50%, #0099ff 100%);
    --card-bg: rgba(18, 24, 46, 0.6);
    --card-border: rgba(0, 245, 255, 0.1);
    --shadow-color: rgba(0, 0, 0, 0.5);

    /* Typography */
    --font-primary: 'Space Grotesk', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Spacing */
    --section-padding: 100px 0;
    --container-max: 1200px;

    /* Animation */
    --transition-speed: 0.3s;
    --bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* ===== LOADING SCREEN ===== */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loader {
    text-align: center;
}

.loader-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--card-border);
    border-top: 3px solid var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

.loader p {
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

[data-theme="light"] {
    --bg-primary: #f5f7fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e8ecf1;
    --text-primary: #1a2237;
    --text-secondary: #4a5568;
    --accent-primary: #0099ff;
    --accent-secondary: #0077cc;
    --card-bg: rgba(255, 255, 255, 0.8);
    --card-border: rgba(0, 153, 255, 0.2);
    --shadow-color: rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

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

/* ===== CANVAS BACKGROUNDS ===== */
#particleCanvas,
#circuitCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

#circuitCanvas {
    opacity: 0.1;
}

/* ===== NAVIGATION ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 14, 39, 0.85);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: all var(--transition-speed);
    border-bottom: 1px solid var(--card-border);
}

.navbar.scrolled {
    background: rgba(10, 14, 39, 0.95);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.logo-bracket {
    color: var(--accent-primary);
    animation: pulse 2s ease-in-out infinite;
}

.logo-name {
    color: var(--text-primary);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    position: relative;
    transition: color var(--transition-speed);
}

.nav-link::before {
    content: attr(data-section);
    position: absolute;
    top: 0;
    left: 0;
    color: var(--accent-primary);
    overflow: hidden;
    width: 0;
    transition: width var(--transition-speed);
}

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

.nav-link:hover::before {
    width: 100%;
}

.theme-toggle {
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--accent-primary);
    padding: 0.5rem;
    border-radius: 50%;
    transition: all var(--transition-speed);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background: var(--card-bg);
    transform: rotate(20deg);
}

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

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--accent-primary);
    transition: all var(--transition-speed);
    border-radius: 3px;
}

/* ===== HERO SECTION ===== */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 2rem;
    overflow: hidden;
}

.hero-container {
    max-width: var(--container-max);
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    animation: fadeInUp 1s ease-out;
}

.hero-greeting {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.wave {
    font-size: 2rem;
    animation: wave 2s ease-in-out infinite;
    transform-origin: 70% 70%;
    display: inline-block;
}

@keyframes wave {
    0%, 100% { transform: rotate(0deg); }
    10%, 30% { transform: rotate(14deg); }
    20% { transform: rotate(-8deg); }
    40% { transform: rotate(-4deg); }
    50% { transform: rotate(10deg); }
}

.greeting-text {
    font-family: var(--font-mono);
    color: var(--accent-primary);
    font-size: 1.2rem;
}

.hero-name {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.name-first,
.name-last {
    display: block;
}

.hero-roles {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 2rem;
    font-size: 1.5rem;
}

.role-prefix {
    color: var(--text-secondary);
}

.typing-container {
    display: flex;
    align-items: center;
}

.typing-text {
    color: var(--accent-primary);
    font-weight: 600;
    min-width: 200px;
}

.cursor {
    color: var(--accent-primary);
    animation: blink 0.7s infinite;
    margin-left: 2px;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.btn {
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all var(--transition-speed);
    border: 2px solid transparent;
    cursor: pointer;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #fff;
    box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px var(--accent-glow);
}

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

.btn-secondary:hover {
    background: var(--card-bg);
    transform: translateY(-2px);
}

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

.social-link {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    border: 2px solid var(--card-border);
    transition: all var(--transition-speed);
    position: relative;
    text-decoration: none;
}

.social-link::before {
    content: attr(data-tooltip);
    position: absolute;
    bottom: -35px;
    background: var(--bg-secondary);
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    font-size: 0.8rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-speed);
}

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

.social-link:hover::before {
    opacity: 1;
}

/* ===== HERO VISUAL ===== */
.hero-visual {
    position: relative;
    height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hologram-container {
    position: relative;
    width: 400px;
    height: 400px;
}

.hologram-layers {
    position: absolute;
    width: 100%;
    height: 100%;
}

.hologram-layer {
    position: absolute;
    border: 2px solid var(--accent-primary);
    border-radius: 50%;
    opacity: 0.3;
    cursor: pointer;
}

/* Meaningful nodes on each ring */
.hologram-layer .ring-node {
    position: absolute;
    width: 6px;
    height: 6px;
    background: var(--accent-primary);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--accent-glow), 0 0 20px var(--accent-glow);
    opacity: 0.8;
    animation: nodePulse 2s ease-in-out infinite;
}

@keyframes nodePulse {
    0%, 100% { transform: scale(1); opacity: 0.8; }
    50% { transform: scale(1.3); opacity: 1; }
}

/* Nucleus with meaningful text */
.hologram-nucleus {
    position: absolute;
    width: 80px;
    height: 80px;
    background: radial-gradient(circle, var(--accent-primary) 0%, transparent 70%);
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: nucleusPulse 3s ease-in-out infinite;
    z-index: 10;
}

.nucleus-text {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--accent-primary);
    text-shadow: 0 0 20px var(--accent-glow);
}

@keyframes nucleusPulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); box-shadow: 0 0 30px var(--accent-glow); }
    50% { transform: translate(-50%, -50%) scale(1.1); box-shadow: 0 0 50px var(--accent-glow); }
}

/* Secret Message Easter Egg */
.secret-message {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    width: 90%;
    max-width: 350px;
    background: var(--bg-secondary);
    border: 2px solid var(--accent-primary);
    border-radius: 12px;
    padding: 2rem;
    opacity: 0;
    transition: all 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 100;
    pointer-events: none;
    box-shadow: 0 0 50px var(--accent-glow), 0 10px 40px var(--shadow-color);
}

.secret-message.revealed {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
    pointer-events: auto;
}

.secret-content h3 {
    color: var(--accent-primary);
    font-size: 1.3rem;
    margin-bottom: 1rem;
    text-align: center;
}

.secret-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.8rem;
    line-height: 1.6;
}

.secret-content ul {
    list-style: none;
    padding: 0;
    margin: 1rem 0;
}

.secret-content ul li {
    color: var(--text-primary);
    font-size: 0.85rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--card-border);
    font-family: var(--font-mono);
}

.secret-content ul li:last-child {
    border-bottom: none;
}

.secret-content ul li strong {
    color: var(--accent-primary);
}

.secret-footer {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--card-border);
    font-style: italic;
    color: var(--accent-primary) !important;
    text-align: center;
    font-size: 0.8rem !important;
}

/* Hover tooltip for rings */
.hologram-layer::after {
    content: attr(data-meaning);
    position: absolute;
    bottom: -30px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-secondary);
    color: var(--accent-primary);
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-family: var(--font-mono);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.hologram-layer:hover::after {
    opacity: 1;
}

.layer-1 {
    width: 100%;
    height: 100%;
    animation: rotate 20s linear infinite;
}

.layer-2 {
    width: 80%;
    height: 80%;
    top: 10%;
    left: 10%;
    animation: rotate 15s linear infinite reverse;
}

.layer-3 {
    width: 60%;
    height: 60%;
    top: 20%;
    left: 20%;
    animation: rotate 10s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.circuit-pattern {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(var(--accent-primary) 1px, transparent 1px),
        linear-gradient(90deg, var(--accent-primary) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.05;
    animation: movePattern 20s linear infinite;
}

@keyframes movePattern {
    from { transform: translate(0, 0); }
    to { transform: translate(50px, 50px); }
}

.data-particles {
    position: absolute;
    width: 100%;
    height: 100%;
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translate(-50%, 0); }
    50% { transform: translate(-50%, 10px); }
}

.mouse {
    width: 25px;
    height: 40px;
    border: 2px solid var(--accent-primary);
    border-radius: 15px;
    position: relative;
}

.wheel {
    width: 3px;
    height: 8px;
    background: var(--accent-primary);
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 2px;
    animation: scroll 1.5s ease-in-out infinite;
}

@keyframes scroll {
    0% { top: 8px; opacity: 1; }
    100% { top: 20px; opacity: 0; }
}

/* ===== SECTIONS ===== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 2rem;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 3rem;
}

.section-number {
    font-family: var(--font-mono);
    color: var(--accent-primary);
    font-size: 1.5rem;
    font-weight: 700;
}

.section-title {
    font-size: 2.5rem;
    color: var(--text-primary);
    white-space: nowrap;
}

.section-line {
    flex: 1;
    height: 1px;
    background: var(--card-border);
}

/* ===== ABOUT SECTION ===== */
.about-section {
    padding: var(--section-padding);
    position: relative;
    z-index: 1;
}

.about-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 4rem;
    align-items: center;
}

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

.highlight {
    color: var(--accent-primary);
    font-weight: 600;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

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

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent-primary);
    font-family: var(--font-mono);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

/* ===== ABOUT VISUAL - Perception Radar ===== */
.about-visual {
    position: relative;
    height: 400px;
}

.perception-radar {
    position: absolute;
    width: 300px;
    height: 300px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.radar-ring {
    position: absolute;
    border: 1px solid var(--accent-primary);
    border-radius: 50%;
    opacity: 0.18;
}

.ring-1 {
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
}

.ring-2 {
    width: 66%;
    height: 66%;
    top: 17%;
    left: 17%;
}

.ring-3 {
    width: 33%;
    height: 33%;
    top: 33.5%;
    left: 33.5%;
}

.radar-dot {
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--accent-primary);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--accent-glow);
}

.dot-1 {
    top: -4px;
    left: 50%;
    transform: translateX(-50%);
}

.dot-2 {
    bottom: -4px;
    left: 50%;
    transform: translateX(-50%);
}

.dot-3 {
    top: 50%;
    right: -4px;
    transform: translateY(-50%);
}

.radar-sweep {
    position: absolute;
    width: 50%;
    height: 1px;
    background: linear-gradient(90deg, var(--accent-primary), transparent);
    top: 50%;
    left: 50%;
    transform-origin: left center;
    animation: radarSpin 4s linear infinite;
    opacity: 0.5;
}

@keyframes radarSpin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.radar-nucleus {
    position: absolute;
    width: 64px;
    height: 64px;
    background: var(--accent-gradient);
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.95rem;
    box-shadow: 0 0 22px var(--accent-glow);
    animation: pulse 2s ease-in-out infinite;
}

/* ===== EXPERIENCE SECTION ===== */
.experience-section {
    padding: var(--section-padding);
    position: relative;
    z-index: 1;
}

.experience-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-top: 2rem;
}

.experience-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 1.5rem 2rem;
    transition: all var(--transition-speed);
    position: relative;
    overflow: hidden;
}

.experience-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 3px;
    height: 100%;
    background: var(--accent-gradient);
    opacity: 0.7;
}

.experience-card:hover {
    border-color: var(--accent-primary);
    box-shadow: 0 0 25px var(--accent-glow);
    transform: translateX(5px);
}

.experience-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.experience-role {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.experience-org {
    font-size: 0.95rem;
    color: var(--accent-secondary);
    font-family: var(--font-mono);
}

.experience-period {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    white-space: nowrap;
}

.experience-highlights {
    list-style: none;
    padding: 0;
    margin: 0;
}

.experience-highlights li {
    position: relative;
    padding-left: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.experience-highlights li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
}

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

/* ===== PROJECTS SECTION ===== */
.projects-section {
    padding: var(--section-padding);
    position: relative;
    z-index: 1;
}

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

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 2rem;
    position: relative;
    overflow: hidden;
    transition: all var(--transition-speed);
    backdrop-filter: blur(10px);
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--accent-gradient);
    transform: scaleX(0);
    transition: transform var(--transition-speed);
}

.project-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    box-shadow: 0 10px 40px rgba(0, 245, 255, 0.2);
}

.project-card:hover::before {
    transform: scaleX(1);
}

.project-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: block;
}

.project-category {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent-primary);
    background: rgba(0, 245, 255, 0.1);
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

.project-date {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    opacity: 0.8;
}

.project-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.project-description {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tech-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
}

.project-link {
    color: var(--accent-primary);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    transition: gap var(--transition-speed);
}

.project-link:hover {
    gap: 1rem;
}

/* Project-specific animations */
.project-card[data-category="embedded"] .project-icon {
    animation: pulseGlow 2s ease-in-out infinite;
}

.project-card[data-category="cv"] .project-icon {
    animation: scanEffect 3s ease-in-out infinite;
}

.project-card[data-category="fullstack"] .project-icon {
    animation: rotateFloat 4s ease-in-out infinite;
}

.project-card[data-category="ai"] .project-icon {
    animation: brainPulse 2s ease-in-out infinite;
}

.project-card[data-category="ml"] .project-icon {
    animation: dataFlow 3s ease-in-out infinite;
}

.project-card[data-category="networking"] .project-icon {
    animation: networkPulse 2.5s ease-in-out infinite;
}

.project-card[data-category="research"] .project-icon {
    animation: researchFloat 3s ease-in-out infinite;
}

.project-card[data-category="robotics"] .project-icon {
    animation: roboticsMove 2.5s ease-in-out infinite;
}

.project-category-section {
    grid-column: 1 / -1;
    margin-top: 1rem;
    margin-bottom: 0.5rem;
}

.category-section-title {
    font-size: 1.3rem;
    color: var(--accent-primary);
    font-family: var(--font-mono);
    font-weight: 600;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--card-border);
    margin-bottom: 1rem;
}

@keyframes pulseGlow {
    0%, 100% { transform: scale(1); filter: brightness(1) drop-shadow(0 0 5px rgba(0, 245, 255, 0.5)); }
    50% { transform: scale(1.1); filter: brightness(1.3) drop-shadow(0 0 15px rgba(0, 245, 255, 0.8)); }
}

@keyframes scanEffect {
    0%, 100% { transform: translateY(0); opacity: 1; }
    50% { transform: translateY(-5px); opacity: 0.7; }
}

@keyframes rotateFloat {
    0%, 100% { transform: rotate(0deg) translateY(0); }
    50% { transform: rotate(10deg) translateY(-5px); }
}

@keyframes dataFlow {
    0%, 100% { transform: translateX(0); opacity: 1; }
    50% { transform: translateX(5px); opacity: 0.8; }
}

@keyframes networkPulse {
    0%, 100% { transform: scale(1); filter: drop-shadow(0 0 3px rgba(0, 245, 255, 0.5)); }
    50% { transform: scale(1.15); filter: drop-shadow(0 0 10px rgba(0, 245, 255, 1)); }
}

@keyframes researchFloat {
    0%, 100% { transform: translateY(0); filter: brightness(1); }
    50% { transform: translateY(-4px); filter: brightness(1.2); }
}

@keyframes roboticsMove {
    0%, 100% { transform: translateX(0) rotate(0deg); }
    25% { transform: translateX(3px) rotate(2deg); }
    75% { transform: translateX(-3px) rotate(-2deg); }
}

/* ===== SKILLS SECTION ===== */
.skills-section {
    padding: var(--section-padding);
    position: relative;
    z-index: 1;
}

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

.skill-category {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 2rem;
    backdrop-filter: blur(10px);
    transition: all var(--transition-speed);
}

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

.category-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.category-header i {
    font-size: 2rem;
    color: var(--accent-primary);
}

.category-header h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

.skills-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.skill-tag {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    font-size: 0.9rem;
    border: 1px solid var(--card-border);
    transition: all var(--transition-speed);
    cursor: default;
}

.skill-tag:hover {
    background: var(--card-bg);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 245, 255, 0.2);
}

/* ===== CONTACT SECTION ===== */
.contact-section {
    padding: var(--section-padding);
    position: relative;
    z-index: 1;
}

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

.contact-text h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.contact-text p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--text-secondary);
}

.contact-item i {
    color: var(--accent-primary);
    font-size: 1.2rem;
}

.contact-cta {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.btn-large {
    padding: 1.2rem 2rem;
    font-size: 1.1rem;
    justify-content: center;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--card-border);
    padding: 2rem 0;
    position: relative;
    z-index: 1;
}

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

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

.footer-year {
    margin-top: 0.3rem;
    opacity: 0.7;
}

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

.footer-links a {
    color: var(--text-secondary);
    font-size: 1.5rem;
    transition: all var(--transition-speed);
}

.footer-links a:hover {
    color: var(--accent-primary);
    transform: translateY(-3px);
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 968px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-visual {
        display: none;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .social-links {
        justify-content: center;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .about-visual {
        display: none;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--bg-secondary);
        width: 100%;
        text-align: center;
        transition: left var(--transition-speed);
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.3);
        padding: 2rem 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-name {
        font-size: 3rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 600px) {
    .hero-name {
        font-size: 2.5rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
}