:root {
            --primary-bg: #0a0a11;
            --secondary-bg: #101020;
            --card-bg: #151525;
            --text-light: #f2f2ff;
            --text-muted: #a0a0c0;
            --accent-red: #e31b54;
            --accent-cyan: #00ffd5;
            --accent-blue: #0084ff;
            --accent-purple: #9900ff;
            --accent-dark-red: #960029;
            --accent-glow: rgba(227, 27, 84, 0.6);
            --accent-cyan-glow: rgba(0, 255, 213, 0.6);
            --accent-blue-glow: rgba(0, 132, 255, 0.6);
            --gradient-primary: linear-gradient(135deg, var(--accent-dark-red), var(--accent-red));
            --gradient-cyber: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            --gradient-background: linear-gradient(135deg, #0a0a18, #151530);
            --gradient-card: linear-gradient(135deg, #12122a, #1a1a35);
            --gradient-hover: linear-gradient(135deg, var(--accent-red), #ff3366);
            --border-radius: 4px;
            --border-radius-sm: 2px;
            --border-radius-lg: 8px;
            --shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.3);
            --shadow-strong: 0 8px 30px rgba(0, 0, 0, 0.4);
            --shadow-neon: 0 0 15px rgba(227, 27, 84, 0.3);
            --shadow-neon-cyan: 0 0 15px rgba(0, 255, 213, 0.3);
            --shadow-neon-blue: 0 0 15px rgba(0, 132, 255, 0.3);
            --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --cyber-border: 1px solid rgba(227, 27, 84, 0.2);
            --glitch-duration: 0.55s;
        }

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

        ::selection {
            background: var(--accent-red);
            color: var(--text-light);
            text-shadow: 0 0 8px rgba(255, 255, 255, 0.8);
        }

        body {
            font-family: 'Rajdhani', sans-serif;
            line-height: 1.6;
            color: var(--text-light);
            background: var(--primary-bg);
            overflow-x: hidden;
            font-weight: 300;
            font-size: 19px;
            position: relative;
        }

        body::before {
            content: "";
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: var(--gradient-background);
            z-index: -1;
        }

        h1, h2, h3, h4, h5, h6 {
            font-family: 'Orbitron', sans-serif;
            font-weight: 600;
            letter-spacing: -0.5px;
            color: white;
        }

        .section {
            padding: 100px 0;
            position: relative;
            overflow: hidden;
        }

        @media (max-width: 767px) {
            .section {
                padding: 70px 0;
            }
        }

        .container {
            position: relative;
            z-index: 1;
        }

        /* Custom cursor */
        .custom-cursor {
            position: fixed;
            width: 20px;
            height: 20px;
            border: 2px solid var(--accent-red);
            border-radius: 50%;
            pointer-events: none;
            transform: translate(-50%, -50%);
            z-index: 9999;
            mix-blend-mode: difference;
            transition: width 0.3s, height 0.3s, background-color 0.3s;
        }

        .custom-cursor::before {
            content: "";
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 4px;
            height: 4px;
            background: var(--accent-red);
            border-radius: 50%;
        }

        .custom-cursor.active {
            width: 50px;
            height: 50px;
            background-color: rgba(227, 27, 84, 0.1);
            mix-blend-mode: normal;
        }

        .cursor-dot {
            position: fixed;
            width: 4px;
            height: 4px;
            background-color: var(--accent-red);
            border-radius: 50%;
            pointer-events: none;
            transform: translate(-50%, -50%);
            z-index: 10000;
            transition: transform 0.1s;
        }

        /* Navbar */
        .navbar {
            padding: 15px 0;
            transition: var(--transition);
            background-color: transparent;
            backdrop-filter: blur(0px);
        }

        .navbar-scrolled {
            background-color: rgba(10, 10, 17, 0.8);
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow-subtle);
            padding: 10px 0;
            border-bottom: 1px solid rgba(227, 27, 84, 0.1);
        }

        .logo-container {
            display: flex;
            align-items: center;
            position: relative;
        }

        .logo-icon {
            width: 40px;
            height: 40px;
            background: var(--gradient-primary);
            color: white;
            border-radius: var(--border-radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            font-weight: bold;
            margin-right: 10px;
            font-family: 'Orbitron', sans-serif;
            transform: rotate(5deg);
            box-shadow: 0 0 15px var(--accent-glow);
            position: relative;
            overflow: hidden;
        }

        .logo-icon::after {
            content: "";
            position: absolute;
            top: -100%;
            left: -100%;
            width: 300%;
            height: 300%;
            background: linear-gradient(transparent, rgba(255, 255, 255, 0.3), transparent);
            transform: rotate(45deg);
            animation: logoShine 4s infinite;
        }

        @keyframes logoShine {
            0% { transform: translateX(-100%) rotate(45deg); }
            100% { transform: translateX(100%) rotate(45deg); }
        }

        .logo-text {
            font-family: 'Orbitron', sans-serif;
            font-weight: 600;
            font-size: 1.5rem;
            color: white;
            letter-spacing: 1px;
            position: relative;
        }

        .logo-text::after {
            content: "PHI ANH";
            position: absolute;
            top: 0;
            left: 0;
            color: var(--accent-red);
            opacity: 0;
            animation: textGlitch 10s infinite;
        }

        @keyframes textGlitch {
            0%, 90%, 100% { opacity: 0; transform: translateX(0); }
            91%, 93%, 95%, 97% { opacity: 0.8; transform: translateX(3px); }
            92%, 94%, 96%, 98% { opacity: 0.8; transform: translateX(-3px); }
        }

        .navbar-nav .nav-link {
            font-weight: 500;
            color: var(--text-light);
            margin-left: 25px;
            position: relative;
            padding: 8px 0;
            font-size: 1.1rem;
            text-transform: uppercase;
            letter-spacing: 2px;
            font-family: 'Rajdhani', sans-serif;
            transition: var(--transition);
            display: inline-block;
        }

        .navbar-nav .nav-link::before {
            content: attr(data-text);
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            color: var(--accent-cyan);
            opacity: 0;
            padding: 8px 0;
            transition: var(--transition);
            z-index: -1;
            transform: translateX(5px);
        }

        .navbar-nav .nav-link:hover::before,
        .navbar-nav .nav-link.active::before {
            opacity: 0.5;
            transform: translateX(2px);
        }

        .navbar-nav .nav-link::after {
            content: "";
            width: 0;
            height: 2px;
            background: var(--gradient-cyber);
            position: absolute;
            bottom: 0;
            left: 0;
            transition: var(--transition);
            border-radius: 10px;
            box-shadow: 0 0 5px var(--accent-cyan-glow);
        }

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

        /* Navbar toggler for mobile */
        .navbar-toggler {
            width: 40px;
            height: 40px;
            border: 1px solid var(--accent-cyan);
            background: rgba(0, 255, 213, 0.05);
            color: var(--accent-cyan);
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--border-radius-sm);
            padding: 0;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .navbar-toggler:focus {
            box-shadow: none;
            outline: none;
        }

        .navbar-toggler i {
            font-size: 1.2rem;
            transition: var(--transition);
        }

        .navbar-toggler:hover {
            background: var(--gradient-cyber);
            border-color: transparent;
            box-shadow: 0 0 15px var(--accent-cyan-glow);
        }

        .navbar-toggler:hover i {
            color: white;
            transform: scale(1.1);
        }

        /* Glitch effect */
        .glitch-effect {
            position: relative;
        }

        .glitch-effect::before,
        .glitch-effect::after {
            content: attr(data-text);
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            opacity: 0;
        }

        .glitch-effect::before {
            color: var(--accent-cyan);
            animation: glitch-skew var(--glitch-duration) cubic-bezier(0.25, 0.46, 0.45, 0.94) infinite;
            transform: skew(5deg);
        }

        .glitch-effect::after {
            color: var(--accent-red);
            animation: glitch-skew var(--glitch-duration) cubic-bezier(0.25, 0.46, 0.45, 0.94) infinite reverse;
            transform: skew(-5deg);
        }

        @keyframes glitch-skew {
            0%, 90%, 100% { opacity: 0; transform: skew(0deg); }
            30%, 35% { opacity: 0.3; transform: skew(2deg); }
            40%, 45% { opacity: 0; transform: skew(0deg); }
            60%, 65% { opacity: 0.3; transform: skew(-2deg); }
        }

        .text-glitch {
            animation: textShift 10s ease-in-out infinite;
        }

        @keyframes textShift {
            0%, 90%, 100% { transform: translateX(0); }
            91%, 93%, 95%, 97% { transform: translateX(3px); }
            92%, 94%, 96%, 98% { transform: translateX(-3px); }
        }

        /* Hero Section */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            position: relative;
            overflow: hidden;
            padding: 120px 0 80px;
        }

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

        .hero-content {
            position: relative;
            z-index: 1;
        }

        .hero-content h1 {
            font-size: 4.5rem;
            font-weight: 700;
            margin-bottom: 20px;
            line-height: 1.1;
            text-transform: uppercase;
            font-family: 'Orbitron', sans-serif;
            letter-spacing: 2px;
            position: relative;
        }

        .hero-content h1 span {
            display: inline-block;
            background: var(--gradient-primary);
            background-clip: text;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            position: relative;
        }

        .hero-content h1 span::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: var(--gradient-primary);
            border-radius: var(--border-radius-sm);
            box-shadow: 0 0 15px var(--accent-glow);
        }

        .hero-content p {
            font-size: 1.5rem;
            margin-bottom: 30px;
            color: var(--text-muted);
            font-weight: 400;
            font-family: 'Share Tech Mono', monospace;
            position: relative;
            overflow: hidden;
            white-space: nowrap;
            border-right: 2px solid var(--accent-cyan);
            padding-left: 16px;
        }

        .hero-content p::before {
            content: ">";
            color: var(--accent-cyan);
            margin-right: 10px;
            font-family: 'Share Tech Mono', monospace;
            position: absolute;
            left: 0;
        }

        .hero-buttons {
            margin-bottom: 25px;
            position: relative;
        }

        .hero-buttons::before {
            content: "";
            position: absolute;
            top: 50%;
            left: -50px;
            width: 40px;
            height: 1px;
            background: var(--accent-red);
            animation: buttonLinePulse 2s infinite;
        }

        @keyframes buttonLinePulse {
            0%, 100% { transform: scaleX(1); opacity: 0.5; }
            50% { transform: scaleX(1.5); opacity: 1; }
        }

        /* Digital rain background */
        .digital-rain {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            overflow: hidden;
            z-index: 0;
            opacity: 0.2;
            pointer-events: none;
        }

        .rain-column {
            position: absolute;
            top: -100px;
            font-family: 'Share Tech Mono', monospace;
            color: var(--accent-cyan);
            font-size: 1.2rem;
            animation: rainFall linear infinite;
        }

        @keyframes rainFall {
            to { transform: translateY(calc(100vh + 200px)); }
        }

        /* Terminal typing effect */
        .terminal-text {
            font-family: 'Share Tech Mono', monospace;
            color: var(--accent-cyan);
            overflow: hidden;
            white-space: nowrap;
            border-right: 2px solid var(--accent-cyan);
            animation: typing 3.5s steps(40, end) 1s forwards, blink-caret 0.75s step-end infinite;
            opacity: 0;
            max-width: 0;
        }

        .terminal-wrapper {
            display: inline-block;
            position: relative;
        }

        .terminal-wrapper::before {
            content: ">";
            margin-right: 8px;
            color: var(--accent-red);
        }

        @keyframes typing {
            from { max-width: 0; opacity: 1; }
            to { max-width: 100%; opacity: 1; }
        }

        @keyframes blink-caret {
            from, to { border-color: transparent; }
            50% { border-color: var(--accent-cyan); }
        }

        /* Cyber Box */
        .cyber-box {
            position: relative;
            border: var(--cyber-border);
            background: rgba(21, 21, 37, 0.7);
            border-radius: var(--border-radius);
            padding: 2px;
            overflow: hidden;
            width: 100%;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .cyber-box::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: var(--gradient-card);
            mask: linear-gradient(#fff 0 0) content-box, 
                   linear-gradient(#fff 0 0);
            mask-composite: exclude;
            -webkit-mask-composite: destination-out;
            padding: 1px;
            border-radius: inherit;
            opacity: 0.8;
        }

        .cyber-box::after {
            content: "";
            position: absolute;
            top: -150%;
            left: -150%;
            width: 400%;
            height: 400%;
            background: conic-gradient(
                transparent, 
                var(--accent-red), 
                transparent 15%, 
                transparent 70%, 
                var(--accent-cyan), 
                transparent 85%
            );
            opacity: 0;
            animation: rotateGradient 8s linear infinite;
        }

        .cyber-box:hover::after {
            opacity: 0.15;
        }

        @keyframes rotateGradient {
            100% { transform: rotate(1turn); }
        }

        .cyber-box-inner {
            position: relative;
            z-index: 1;
            background: rgba(21, 21, 37, 0.7);
            border-radius: calc(var(--border-radius) - 2px);
            height: 100%;
            overflow: hidden;
            backdrop-filter: blur(5px);
            padding: 20px;
        }

        .cyber-box:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(227, 27, 84, 0.2), 0 0 15px var(--accent-glow);
        }

        /* Cyber corners */
        .cyber-box-corners {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
        }

        .cyber-corner {
            position: absolute;
            width: 8px;
            height: 8px;
            border-color: var(--accent-red);
            opacity: 0.8;
            transition: all 0.3s ease;
        }

        .corner-tl {
            top: 0;
            left: 0;
            border-top: 2px solid;
            border-left: 2px solid;
        }

        .corner-tr {
            top: 0;
            right: 0;
            border-top: 2px solid;
            border-right: 2px solid;
        }

        .corner-bl {
            bottom: 0;
            left: 0;
            border-bottom: 2px solid;
            border-left: 2px solid;
        }

        .corner-br {
            bottom: 0;
            right: 0;
            border-bottom: 2px solid;
            border-right: 2px solid;
        }

        .cyber-box:hover .cyber-corner {
            width: 15px;
            height: 15px;
            border-color: var(--accent-cyan);
            opacity: 1;
        }

        /* Buttons */
        .btn-cyber {
            background: var(--gradient-primary);
            color: white;
            border: none;
            padding: 12px 28px;
            font-size: 1rem;
            font-weight: 500;
            border-radius: var(--border-radius-sm);
            transition: var(--transition);
            text-transform: uppercase;
            letter-spacing: 1px;
            position: relative;
            overflow: hidden;
            font-family: 'Orbitron', sans-serif;
            box-shadow: 0 0 10px var(--accent-glow);
            z-index: 1;
            margin-right: 10px;
        }

        .btn-cyber::before {
            content: "";
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
            transition: var(--transition);
            z-index: -1;
        }

        .btn-cyber:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 20px var(--accent-glow);
            color: white;
        }

        .btn-cyber:hover::before {
            left: 100%;
            transition: 0.7s;
        }

        .btn-outline {
            background: transparent;
            color: var(--text-light);
            border: 1px solid var(--accent-cyan);
            padding: 12px 28px;
            font-size: 1rem;
            font-weight: 500;
            border-radius: var(--border-radius-sm);
            transition: var(--transition);
            text-transform: uppercase;
            letter-spacing: 1px;
            font-family: 'Orbitron', sans-serif;
            position: relative;
            overflow: hidden;
            z-index: 1;
        }

        .btn-outline::before {
            content: "";
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: var(--gradient-cyber);
            transition: 0.5s;
            z-index: -1;
            opacity: 0;
        }

        .btn-outline:hover {
            color: white;
            border-color: transparent;
            box-shadow: 0 0 15px var(--accent-cyan-glow);
        }

        .btn-outline:hover::before {
            left: 0;
            opacity: 1;
        }

        /* Section Title */
        .section-title {
            margin-bottom: 60px;
            position: relative;
            text-align: center;
            padding-top: 30px;
        }

        .section-title h2 {
            font-size: 2.8rem;
            font-weight: 600;
            position: relative;
            display: inline-block;
            margin-bottom: 15px;
            color: white;
            text-transform: uppercase;
            letter-spacing: 2px;
        }

        .section-title h2::before {
            content: "</>";
            position: absolute;
            top: -40px;
            left: 50%;
            transform: translateX(-50%);
            font-size: 1.1rem;
            color: var(--accent-cyan);
            opacity: 0.7;
            font-family: 'Share Tech Mono', monospace;
        }

        .section-title h2::after {
            content: "";
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 2px;
            background: var(--gradient-cyber);
            border-radius: 10px;
            box-shadow: 0 0 10px var(--accent-cyan-glow);
        }

        .section-title p {
            color: var(--text-muted);
            font-size: 1.3rem;
            max-width: 600px;
            margin: 15px auto 0;
            font-weight: 300;
            font-family: 'Titillium Web', sans-serif;
        }

        /* Terminal section dividers */
        .terminal-divider {
            height: 40px;
            position: relative;
            margin: 40px 0;
            width: 100%;
            overflow: hidden;
        }

        .terminal-line {
            position: absolute;
            left: 0;
            top: 50%;
            width: 100%;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--accent-red), var(--accent-cyan), transparent);
        }

        .terminal-commands {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background: var(--primary-bg);
            padding: 0 20px;
            font-family: 'Share Tech Mono', monospace;
            color: var(--accent-cyan);
            font-size: 0.9rem;
        }

        /* Skill section enhancements */
        .skills-container {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
        }

        @media (max-width: 991px) {
            .skills-container {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 575px) {
            .skills-container {
                grid-template-columns: repeat(2, 1fr);
                gap: 15px;
            }
        }

        .skill-item {
            padding: 30px 25px;
            transition: var(--transition);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .skill-icon {
            width: 90px;
            height: 90px;
            margin: 0 auto 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(0, 255, 213, 0.05);
            border-radius: 12px;
            padding: 20px;
            border: 1px solid rgba(0, 255, 213, 0.2);
            transition: var(--transition);
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
            position: relative;
            overflow: hidden;
        }

        .skill-icon::after {
            content: "";
            position: absolute;
            top: -100%;
            left: -100%;
            width: 300%;
            height: 300%;
            background: linear-gradient(
                transparent, 
                rgba(0, 255, 213, 0.2), 
                transparent
            );
            transform: rotate(45deg);
            transition: 0.5s;
        }

        .skill-item:hover .skill-icon::after {
            animation: iconShine 1.5s;
        }

        @keyframes iconShine {
            0% { transform: translateX(-100%) rotate(45deg); }
            100% { transform: translateX(100%) rotate(45deg); }
        }

        .skill-item:hover .skill-icon {
            transform: scale(1.1) rotate(-5deg);
            box-shadow: 0 0 20px var(--accent-cyan-glow);
            background: rgba(0, 255, 213, 0.1);
        }

        .skill-icon img {
            max-width: 110%;
            max-height: 110%;
            object-fit: contain;
            filter: drop-shadow(0 0 5px var(--accent-cyan-glow));
        }

        .skill-title {
            font-weight: 600;
            font-size: 1.4rem;
            margin-bottom: 15px;
            color: white;
            font-family: 'Orbitron', sans-serif;
            letter-spacing: 1px;
            position: relative;
            display: inline-block;
        }

        .skill-title::after {
            content: "";
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 100%;
            height: 1px;
            background: var(--gradient-cyber);
            transform: scaleX(0);
            transform-origin: right;
            transition: transform 0.5s;
        }

        .skill-item:hover .skill-title::after {
            transform: scaleX(1);
            transform-origin: left;
        }

        .skill-percentage {
            font-size: 1rem;
            color: var(--text-muted);
            margin-bottom: 15px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-family: 'Share Tech Mono', monospace;
        }

        .skill-percentage span {
            color: var(--accent-cyan);
            font-weight: 600;
            font-family: 'Share Tech Mono', monospace;
        }

        .skill-level {
            width: 100%;
            height: 6px;
            background-color: rgba(255, 255, 255, 0.05);
            border-radius: 10px;
            overflow: hidden;
            position: relative;
        }

        .skill-level-bar {
            height: 100%;
            border-radius: 10px;
            background: var(--gradient-cyber);
            box-shadow: 0 0 10px var(--accent-cyan-glow);
            position: relative;
            width: 0;
            transition: width 1.5s cubic-bezier(0.1, 0.5, 0.1, 1);
        }

        .skill-level-bar::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 30px;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
            animation: loadingShine 2s infinite;
        }

        @keyframes loadingShine {
            0% { transform: translateX(-100%); }
            100% { transform: translateX(500%); }
        }

        /* Timeline enhancements */
        .timeline {
            position: relative;
            padding-left: 30px;
        }

        .timeline::before {
            content: "";
            position: absolute;
            left: 0;
            top: 0;
            width: 2px;
            height: 100%;
            background: linear-gradient(to bottom, var(--accent-blue) 0%, var(--accent-cyan) 100%);
            border-radius: 10px;
            box-shadow: 0 0 10px var(--accent-cyan-glow);
        }

        .timeline-item {
            position: relative;
            margin-bottom: 30px;
            padding-bottom: 20px;
            z-index: 1;
        }

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

        .timeline-item::before {
            content: "";
            position: absolute;
            left: -38px;
            top: 0;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background-color: var(--primary-bg);
            border: 2px solid var(--accent-cyan);
            z-index: 1;
            transition: var(--transition);
            transform: scale(0);
            transform-origin: center;
            box-shadow: 0 0 0 4px rgba(0, 255, 213, 0.1);
            opacity: 0;
        }

        .timeline-item.active::before {
            transform: scale(1);
            box-shadow: 0 0 10px var(--accent-cyan-glow);
            opacity: 1;
            transition: transform 0.5s ease, opacity 0.5s ease, box-shadow 0.5s ease;
        }

        .timeline-item::after {
            content: "";
            position: absolute;
            left: -30px;
            top: 8px;
            width: 0;
            height: 2px;
            background: linear-gradient(to right, var(--accent-blue), var(--accent-cyan));
            z-index: 0;
            transition: width 0.5s ease 0.3s;
        }

        .timeline-item.active::after {
            width: 20px;
        }

        .timeline-content {
            position: relative;
            padding: 15px;
            border: 1px solid rgba(0, 255, 213, 0.1);
            border-radius: var(--border-radius);
            background: rgba(21, 21, 37, 0.5);
            transition: var(--transition);
            overflow: hidden;
        }

        .timeline-content::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 5px;
            height: 100%;
            background: var(--gradient-cyber);
            opacity: 0;
            transition: var(--transition);
        }

        .timeline-item:hover .timeline-content {
            transform: translateX(5px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            border-color: rgba(0, 255, 213, 0.3);
            background: rgba(21, 21, 37, 0.7);
        }

        .timeline-item:hover .timeline-content::before {
            opacity: 1;
        }

        .timeline-date {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(0, 255, 213, 0.1);
            color: var(--accent-cyan);
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 15px;
            border-radius: 4px;
            border: 1px solid rgba(0, 255, 213, 0.2);
            font-family: 'Share Tech Mono', monospace;
            position: relative;
            overflow: hidden;
        }

        .timeline-item:hover .timeline-date {
            background: rgba(0, 255, 213, 0.2);
            box-shadow: 0 0 10px var(--accent-cyan-glow);
        }

        /* Contact section enhancements */
        .contact-box {
            text-align: center;
            padding: 5px;
            transition: var(--transition);
            position: relative;
            margin: 10px;
        }

        .contact-box-inner {
            position: relative;
            z-index: 2;
            padding: 25px 20px;
            background: rgba(21, 21, 37, 0.7);
            border-radius: var(--border-radius);
            border: 1px solid rgba(0, 255, 213, 0.2);
            transition: var(--transition);
            overflow: hidden;
        }

        .contact-box-inner::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(45deg, rgba(0, 255, 213, 0.05), rgba(0, 132, 255, 0.05));
            z-index: -1;
            opacity: 0;
            transition: var(--transition);
        }

        .contact-box:hover .contact-box-inner {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1), 0 0 15px var(--accent-cyan-glow);
            border-color: var(--accent-cyan);
        }

        .contact-box:hover .contact-box-inner::before {
            opacity: 1;
        }

        .contact-box i {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 70px;
            height: 70px;
            background: rgba(0, 255, 213, 0.1);
            color: var(--accent-cyan);
            font-size: 1.6rem;
            border-radius: 12px;
            margin-bottom: 20px;
            transition: var(--transition);
            border: 1px solid rgba(0, 255, 213, 0.2);
            position: relative;
            overflow: hidden;
        }

        .contact-box i::after {
            content: "";
            position: absolute;
            top: -100%;
            left: -100%;
            width: 300%;
            height: 300%;
            background: linear-gradient(transparent, rgba(0, 255, 213, 0.2), transparent);
            transform: rotate(45deg);
            transition: 0.5s;
        }

        .contact-box:hover i::after {
            animation: iconShine 1.5s;
        }

        .contact-box:hover i {
            background: var(--gradient-cyber);
            color: white;
            transform: scale(1.1) rotate(-5deg);
            box-shadow: 0 0 15px var(--accent-cyan-glow);
        }

        /* Form styling */
        .form-control {
            height: 50px;
            border-radius: var(--border-radius-sm);
            margin-bottom: 25px;
            border: 1px solid rgba(0, 255, 213, 0.2);
            padding-left: 20px;
            font-size: 1.05rem;
            transition: var(--transition);
            background-color: rgba(255, 255, 255, 0.03);
            color: var(--text-light);
            font-family: 'Share Tech Mono', monospace;
            -webkit-text-fill-color: var(--text-light);
        }
        
        /* Đảm bảo văn bản luôn hiển thị màu sáng trong mọi trạng thái */
        .form-control:focus,
        .form-control:active,
        .form-control:focus-visible {
            color: var(--text-light);
            -webkit-text-fill-color: var(--text-light);
        }
        
        /* Khắc phục vấn đề với autofill của trình duyệt */
        input:-webkit-autofill,
        input:-webkit-autofill:hover, 
        input:-webkit-autofill:focus,
        input:-webkit-autofill:active {
            -webkit-box-shadow: 0 0 0 30px rgba(21, 21, 37, 0.7) inset !important;
            -webkit-text-fill-color: var(--text-light) !important;
            caret-color: var(--text-light);
        }
        
        .contact-form-inner {
            padding-top: 35px;
        }

        .form-control:focus {
            box-shadow: none;
            border-color: var(--accent-cyan);
            background-color: rgba(255, 255, 255, 0.05);
            box-shadow: 0 0 10px rgba(0, 255, 213, 0.1);
        }

        .form-control::placeholder {
            color: rgba(255, 255, 255, 0.3);
            font-family: 'Share Tech Mono', monospace;
        }

        textarea.form-control {
            height: 140px;
            padding-top: 15px;
            resize: none;
        }

        /* Loading animation */
        .loader {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: var(--primary-bg);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 9999;
            transition: opacity 0.5s, visibility 0.5s;
        }

        .loader.fade-out {
            opacity: 0;
            visibility: hidden;
        }

        .loader-content {
            text-align: center;
            position: relative;
        }

        .loader-text {
            font-size: 1.5rem;
            letter-spacing: 3px;
            color: var(--text-light);
            text-transform: uppercase;
            font-weight: 600;
            font-family: 'Share Tech Mono', monospace;
            position: relative;
            margin-top: 20px;
        }

        .loader-terminal {
            width: 300px;
            height: 200px;
            background: rgba(21, 21, 37, 0.9);
            border: 1px solid var(--accent-cyan);
            border-radius: var(--border-radius);
            padding: 15px;
            overflow: hidden;
            box-shadow: 0 0 20px var(--accent-cyan-glow);
            margin: 0 auto 20px;
            position: relative;
        }

        .loader-terminal::before {
            content: "INITIALIZING SYSTEM...";
            position: absolute;
            top: 10px;
            left: 15px;
            color: var(--accent-cyan);
            font-family: 'Share Tech Mono', monospace;
            font-size: 0.9rem;
        }

        .loader-progress {
            position: absolute;
            bottom: 15px;
            left: 15px;
            right: 15px;
            height: 20px;
            background: rgba(0, 0, 0, 0.3);
            border: 1px solid var(--accent-cyan);
            border-radius: 3px;
            overflow: hidden;
        }

        .loader-progress-bar {
            height: 100%;
            background: var(--gradient-cyber);
            width: 0%;
            transition: width 3s cubic-bezier(0.1, 0.5, 0.1, 1);
        }

        .loader-output {
            color: var(--accent-cyan);
            font-family: 'Share Tech Mono', monospace;
            font-size: 0.8rem;
            margin-top: 40px;
            text-align: left;
            height: 100px;
            overflow: hidden;
        }

        .loader-output-line {
            margin-bottom: 5px;
            opacity: 0;
            transform: translateX(-20px);
            transition: opacity 0.3s, transform 0.3s;
        }

        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 20px;
            width: 45px;
            height: 45px;
            background: var(--gradient-cyber);
            color: white;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            z-index: 99;
            transition: var(--transition);
            opacity: 0;
            visibility: hidden;
            box-shadow: 0 0 15px var(--accent-cyan-glow);
            transform: translateY(20px) rotate(45deg);
        }

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

        .back-to-top:hover {
            background: var(--gradient-primary);
            transform: translateY(-5px);
            box-shadow: 0 0 20px var(--accent-glow);
        }

        @media (max-width: 767px) {
            .back-to-top {
                bottom: 20px;
                right: 15px;
                width: 40px;
                height: 40px;
                font-size: 1rem;
            }
        }

        /* 3D animation canvas */
        #canvas-container {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 0;
            opacity: 0.2;
            pointer-events: none;
        }

        /* Footer with enhanced styling */
        .footer {
            padding: 40px 0;
            background-color: rgba(16, 16, 32, 0.9);
            color: var(--text-muted);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .footer::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 1px;
            background: var(--gradient-cyber);
        }

        .footer-content {
            max-width: 600px;
            margin: 0 auto;
            position: relative;
            z-index: 1;
        }

        .footer-logo {
            font-size: 1.8rem;
            font-weight: 600;
            margin-bottom: 20px;
            font-family: 'Orbitron', sans-serif;
            color: white;
            letter-spacing: 2px;
            position: relative;
            display: inline-block;
        }

        .footer-logo::after {
            content: "";
            position: absolute;
            bottom: -8px;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--gradient-cyber);
            transform: scaleX(0.3);
            transform-origin: center;
            transition: transform 0.5s;
        }

        .footer:hover .footer-logo::after {
            transform: scaleX(1);
        }

        .footer-social {
            margin: 25px 0;
            display: flex;
            justify-content: center;
            gap: 15px;
        }

        .footer-social a {
            display: inline-flex;
            width: 40px;
            height: 40px;
            align-items: center;
            justify-content: center;
            background-color: rgba(0, 255, 213, 0.05);
            color: var(--text-muted);
            border-radius: 8px;
            transition: var(--transition);
            border: 1px solid rgba(0, 255, 213, 0.1);
            position: relative;
            overflow: hidden;
        }

        .footer-social a::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: var(--gradient-cyber);
            opacity: 0;
            transition: opacity 0.3s;
            z-index: -1;
        }

        .footer-social a:hover {
            color: white;
            transform: translateY(-5px) rotate(10deg);
            box-shadow: 0 5px 15px var(--accent-cyan-glow);
            border-color: transparent;
        }

        .footer-social a:hover::before {
            opacity: 1;
        }

        .footer-links {
            margin: 25px 0;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
        }

        .footer-links a {
            color: var(--text-muted);
            margin: 0 15px;
            transition: var(--transition);
            font-size: 1rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            text-decoration: none;
            font-weight: 400;
            font-family: 'Rajdhani', sans-serif;
            position: relative;
            padding: 5px 0;
        }

        .footer-links a::before {
            content: "";
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 1px;
            background: var(--gradient-cyber);
            transform: scaleX(0);
            transform-origin: right;
            transition: transform 0.5s;
        }

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

        .footer-links a:hover::before {
            transform: scaleX(1);
            transform-origin: left;
        }

        .copyright {
            font-size: 1rem;
            color: var(--text-muted);
            font-weight: 300;
            font-family: 'Share Tech Mono', monospace;
            position: relative;
            display: inline-block;
            padding: 10px 20px;
            border-top: 1px dashed rgba(0, 255, 213, 0.1);
            border-bottom: 1px dashed rgba(0, 255, 213, 0.1);
        }

        /* Grid pattern enhanced */
        .grid-pattern {
            position: fixed;
            width: 100%;
            height: 100%;
            top: 0;
            left: 0;
            background-size: 50px 50px;
            background-image: 
                linear-gradient(to right, rgba(0, 255, 213, 0.03) 1px, transparent 1px),
                linear-gradient(to bottom, rgba(0, 255, 213, 0.03) 1px, transparent 1px);
            z-index: -1;
            opacity: 0.5;
            pointer-events: none;
        }

        /* Holographic floating elements */
        .holo-element {
            position: absolute;
            width: 150px;
            height: 150px;
            background: linear-gradient(135deg, rgba(0, 255, 213, 0.05), rgba(0, 132, 255, 0.05));
            border-radius: 20px;
            transform: rotate(45deg);
            filter: blur(5px);
            opacity: 0.1;
            z-index: -1;
            animation: floatElement 15s infinite ease-in-out;
        }

        @keyframes floatElement {
            0%, 100% { transform: rotate(45deg) translate(0, 0); }
            25% { transform: rotate(40deg) translate(30px, -20px); }
            50% { transform: rotate(50deg) translate(-20px, -40px); }
            75% { transform: rotate(35deg) translate(-40px, 30px); }
        }

        /* Scanline effect */
        .scanlines {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 9998;
            background: linear-gradient(
                to bottom,
                transparent 50%,
                rgba(0, 0, 0, 0.05) 51%,
                transparent 51%
            );
            background-size: 100% 4px;
            opacity: 0.15;
        }

        /* Responsive styles */
        @media (max-width: 1199.98px) {
            .hero-content h1 {
                font-size: 4rem;
            }
            
            .hero-content p {
                font-size: 1.4rem;
            }
            
            .section-title h2 {
                font-size: 2.6rem;
            }
        }

        @media (max-width: 991.98px) {
            .hero-content h1 {
                font-size: 3.5rem;
            }
            
            .hero-content p {
                font-size: 1.3rem;
            }
            
            .section {
                padding: 80px 0;
            }
            
            .section-title h2 {
                font-size: 2.4rem;
            }
            
            .navbar-collapse {
                background: rgba(16, 16, 32, 0.95);
                backdrop-filter: blur(10px);
                padding: 20px;
                border-radius: var(--border-radius);
                box-shadow: var(--shadow-subtle);
                margin-top: 15px;
                border: 1px solid rgba(0, 255, 213, 0.1);
            }
            
            .navbar-nav .nav-link {
                margin-left: 0;
                padding: 12px 0;
                border-bottom: 1px solid rgba(0, 255, 213, 0.1);
            }
            
            .navbar-nav .nav-item:last-child .nav-link {
                border-bottom: none;
            }
        }

        @media (max-width: 767px) {
            .hero-content h1 {
                font-size: 3rem;
            }
            
            .hero-content p {
                font-size: 1.2rem;
            }
            
            .hero-buttons {
                display: flex;
                flex-direction: column;
                gap: 15px;
            }
            
            .hero-buttons .btn {
                width: 100%;
                margin-right: 0;
            }
            
            .btn-cyber, .btn-outline {
                padding: 10px 20px;
            }
            
            .section {
                padding: 70px 0;
            }
            
            .section-title h2 {
                font-size: 2.2rem;
            }
            
            .contact-methods {
                display: flex;
                overflow-x: auto;
                padding-bottom: 15px;
                gap: 15px;
                scroll-snap-type: x mandatory;
                width: 100%;
            }
            
            .contact-box {
                min-width: 220px;
                scroll-snap-align: center;
                flex: 0 0 auto;
            }
            
            /* Add extra spacing between education and experience sections on mobile */
            .col-lg-6:first-child .cyber-box {
                margin-bottom: 40px;
            }
            
            /* Fix for hero text on mobile */
            .hero-content p {
                white-space: normal;
                border-right: none;
                padding-left: 20px;
            }
            
            .hero-content p::before {
                left: 0;
            }
        }

        @media (max-width: 575.98px) {
            .hero-content h1 {
                font-size: 2.4rem;
            }
            
            .hero {
                padding-top: 100px;
            }
            
            .section-title h2 {
                font-size: 2rem;
            }
            
            .skill-icon {
                width: 70px;
                height: 70px;
                padding: 15px;
            }
            
            .contact-methods {
                grid-template-columns: 1fr;
            }
            
            .custom-cursor, .cursor-dot {
                display: none;
            }
            
            /* Fix for navbar toggler and back-to-top on mobile */
            .navbar-toggler {
                width: 35px !important;
                height: 35px !important;
            }
            
            .navbar-toggler i {
                font-size: 1rem !important;
            }
            
            .back-to-top {
                width: 35px !important;
                height: 35px !important;
                bottom: 15px !important;
                right: 15px !important;
            }
            
            /* Fix for skills grid on small screens */
            .skills-container {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            
            .skill-item {
                padding: 20px 10px;
            }
            
            .skill-title {
                font-size: 1.2rem;
            }
        }
        
        /* Extra small devices fixes */
        @media (max-width: 380px) {
            .hero-content h1 {
                font-size: 2.2rem;
            }
            
            .section-title h2 {
                font-size: 1.8rem;
            }
            
            .section-title p {
                font-size: 1rem;
            }
            
            .skills-container {
                grid-template-columns: 1fr;
            }
            
            .contact-box {
                margin: 0 0 15px;
                width: 100%;
            }
            
            .footer-links a {
                margin: 0 8px 8px;
                font-size: 0.9rem;
            }
        }