/*
 * Portfolio Website - Vu Tran / LabProveHub
 * Copyright (c) 2025 Vu Tran
 * 
 * Licensed under MIT License - see LICENSE file for details
 * https://labprovehub.com
 */

:root {
    /* Color Palette - Refined Dark with Security Accents */
    --primary-bg: #0a0e1a;
    --secondary-bg: #12182b;
    --card-bg: #1a2234;
    --accent-primary: #00ff88;
    --accent-secondary: #00d4ff;
    --accent-warning: #ff6b35;
    --accent-ai: #9d4edd;
    --text-primary: #e8edf4;
    --text-secondary: #8b95a8;
    --text-muted: #5a6478;
    --border-color: #2a3447;
    --shadow-color: rgba(0, 255, 136, 0.1);
    
    /* Typography */
    --font-display: 'Orbitron', sans-serif;
    --font-code: 'Fira Code', monospace;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* Spacing */
    --section-padding: 120px;
    --container-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-mono);
    background: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

/* Animated Background */
.grid-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(var(--border-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--border-color) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.15;
    z-index: -2;
    animation: gridMove 20s linear infinite;
}

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

.scan-line {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, 
        transparent, 
        var(--accent-primary), 
        transparent);
    z-index: 9999;
    animation: scan 4s linear infinite;
    pointer-events: none;
    box-shadow: 0 0 20px var(--accent-primary);
}

@keyframes scan {
    0% { transform: translateY(0); }
    100% { transform: translateY(100vh); }
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(10, 14, 26, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 1rem 0;
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-code);
    font-size: 1.2rem;
    font-weight: 600;
}

.terminal-prompt {
    color: var(--accent-primary);
    font-weight: 700;
}

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

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

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-family: var(--font-code);
    font-size: 0.9rem;
    transition: all 0.3s ease;
    position: relative;
}

.nav-menu a::before {
    content: '>';
    position: absolute;
    left: -15px;
    opacity: 0;
    color: var(--accent-primary);
    transition: all 0.3s ease;
}

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

.nav-menu a:hover::before {
    opacity: 1;
    left: -20px;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-toggle span {
    width: 25px;
    height: 2px;
    background: var(--accent-primary);
    transition: all 0.3s ease;
}

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

/* Hero Section */
.hero {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 4rem;
    padding: 8rem 2rem 4rem;
    max-width: var(--container-width);
    margin: 0 auto;
    position: relative;
}

.status-bar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 2rem;
    font-family: var(--font-code);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.status-indicator {
    width: 8px;
    height: 8px;
    background: var(--accent-primary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; box-shadow: 0 0 10px var(--accent-primary); }
    50% { opacity: 0.5; box-shadow: 0 0 5px var(--accent-primary); }
}

.hero-title {
    font-family: var(--font-display);
    font-size: 5rem;
    font-weight: 900;
    line-height: 1;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: -2px;
}

.title-line {
    display: block;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.8s ease backwards;
}

.title-line:nth-child(2) {
    animation-delay: 0.2s;
}

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

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    font-family: var(--font-code);
    animation: fadeInUp 0.8s ease 0.4s backwards;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 3rem;
    animation: fadeInUp 0.8s ease 0.6s backwards;
}

.stat-item {
    text-align: center;
    padding: 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    box-shadow: 0 10px 30px var(--shadow-color);
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-family: var(--font-code);
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    animation: fadeInUp 0.8s ease 0.8s backwards;
}

.btn {
    padding: 1rem 2rem;
    font-family: var(--font-code);
    font-size: 0.95rem;
    text-decoration: none;
    border-radius: 4px;
    transition: all 0.3s ease;
    display: inline-block;
    font-weight: 500;
}

.btn-primary {
    background: var(--accent-primary);
    color: var(--primary-bg);
    border: 2px solid var(--accent-primary);
}

.btn-primary:hover {
    background: transparent;
    color: var(--accent-primary);
    box-shadow: 0 0 20px var(--shadow-color);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

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

/* Terminal Window */
.hero-visual {
    animation: fadeInUp 0.8s ease 1s backwards;
}

.terminal-window {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.terminal-header {
    background: var(--secondary-bg);
    padding: 0.8rem 1rem;
    display: flex;
    gap: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.terminal-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot-red { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #27c93f; }

.terminal-body {
    padding: 1.5rem;
    font-family: var(--font-code);
    font-size: 0.9rem;
    line-height: 1.8;
}

.terminal-line {
    margin-bottom: 0.5rem;
}

.prompt {
    color: var(--accent-primary);
    margin-right: 0.5rem;
}

.command {
    color: var(--accent-secondary);
}

.terminal-output {
    color: var(--text-secondary);
    margin-left: 2rem;
    margin-bottom: 0.3rem;
}

.cursor-blink {
    animation: blink 1s infinite;
}

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

/* Section Styling */
section {
    padding: var(--section-padding) 0;
    position: relative;
}

.section-header {
    margin-bottom: 4rem;
    text-align: center;
}

.section-tag {
    font-family: var(--font-code);
    color: var(--accent-primary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    display: block;
    opacity: 0.7;
}

.section-tag-close {
    font-family: var(--font-code);
    color: var(--accent-primary);
    font-size: 0.9rem;
    margin-top: 4rem;
    display: block;
    opacity: 0.7;
    text-align: center;
}

.section-title {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-transform: uppercase;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

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

.about-text {
    max-width: 1000px;
    margin: 0 auto;
}

.lead {
    font-size: 1.3rem;
    color: var(--accent-primary);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.expertise-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    transition: all 0.3s ease;
}

.expertise-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    box-shadow: 0 10px 30px var(--shadow-color);
}

.expertise-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.expertise-card h3 {
    font-family: var(--font-display);
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.expertise-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin: 0;
}

/* Education Section */
.education-section {
    background: var(--primary-bg);
}

.education-content {
    max-width: 1000px;
    margin: 0 auto;
}

.degree-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 3rem;
    margin-bottom: 4rem;
    transition: all 0.3s ease;
}

.degree-card.featured {
    border: 2px solid var(--accent-ai);
    box-shadow: 0 10px 40px rgba(157, 78, 221, 0.2);
}

.degree-badge {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.degree-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--accent-ai), var(--accent-secondary));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
}

.status-badge {
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-family: var(--font-code);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
}

.status-badge.in-progress {
    background: rgba(157, 78, 221, 0.2);
    border: 1px solid var(--accent-ai);
    color: var(--accent-ai);
}

.degree-title {
    font-family: var(--font-display);
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.degree-school {
    color: var(--accent-ai);
    font-family: var(--font-code);
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
}

.degree-period {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

.degree-description {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.7;
}

/* Courses Section */
.courses-section {
    margin-top: 3rem;
}

.courses-heading {
    font-family: var(--font-display);
    font-size: 1.8rem;
    margin-bottom: 2rem;
    text-align: center;
    color: var(--text-primary);
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.course-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--accent-ai);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.course-card.completed::before {
    background: var(--accent-primary);
    opacity: 1;
}

.course-card.in-progress::before {
    background: var(--accent-ai);
    opacity: 1;
}

.course-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-ai);
    box-shadow: 0 10px 30px rgba(157, 78, 221, 0.2);
}

.course-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    font-family: var(--font-code);
    font-size: 0.8rem;
}

.status-icon {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

.course-card.completed .status-icon {
    background: var(--accent-primary);
    color: var(--primary-bg);
}

.course-card.in-progress .status-icon {
    background: var(--accent-ai);
    color: var(--primary-bg);
}

.course-card.completed .status-text {
    color: var(--accent-primary);
}

.course-card.in-progress .status-text {
    color: var(--accent-ai);
}

.course-card h4 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.course-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.course-skills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-badge {
    font-family: var(--font-code);
    font-size: 0.75rem;
    padding: 0.3rem 0.7rem;
    background: rgba(157, 78, 221, 0.1);
    border: 1px solid var(--accent-ai);
    border-radius: 4px;
    color: var(--accent-ai);
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, 
        var(--accent-primary), 
        var(--accent-secondary));
}

.timeline-item {
    position: relative;
    padding-left: 4rem;
    margin-bottom: 4rem;
}

.timeline-marker {
    position: absolute;
    left: -6px;
    top: 0;
    width: 14px;
    height: 14px;
    background: var(--accent-primary);
    border-radius: 50%;
    box-shadow: 0 0 0 4px var(--primary-bg),
                0 0 0 6px var(--accent-primary);
}

.timeline-content {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    transition: all 0.3s ease;
}

.timeline-content:hover {
    border-color: var(--accent-primary);
    box-shadow: 0 10px 30px var(--shadow-color);
}

.timeline-period {
    font-family: var(--font-code);
    color: var(--accent-primary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.timeline-content h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.company {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 1.5rem;
    font-style: italic;
}

.achievements {
    list-style: none;
    margin-bottom: 1.5rem;
}

.achievements li {
    color: var(--text-secondary);
    padding-left: 1.5rem;
    margin-bottom: 0.8rem;
    position: relative;
}

.achievements li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-size: 1.2rem;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    font-family: var(--font-code);
    font-size: 0.8rem;
    padding: 0.3rem 0.8rem;
    background: rgba(0, 255, 136, 0.1);
    border: 1px solid var(--accent-primary);
    border-radius: 4px;
    color: var(--accent-primary);
}

/* Certifications */
.certifications-section {
    background: var(--secondary-bg);
}

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

.cert-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    transition: all 0.3s ease;
}

.cert-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    box-shadow: 0 10px 30px var(--shadow-color);
}

.cert-badge {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.cert-icon {
    font-size: 2rem;
}

.cert-title {
    font-family: var(--font-display);
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.cert-org {
    color: var(--accent-primary);
    font-family: var(--font-code);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.cert-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.cert-skills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-tag {
    font-family: var(--font-code);
    font-size: 0.75rem;
    padding: 0.3rem 0.6rem;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid var(--accent-secondary);
    border-radius: 4px;
    color: var(--accent-secondary);
}

/* Projects */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    box-shadow: 0 10px 30px var(--shadow-color);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.project-number {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent-primary);
    opacity: 0.2;
}

.project-status {
    font-family: var(--font-code);
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-primary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.project-title {
    font-family: var(--font-display);
    font-size: 1.4rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.project-description {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tech-badge {
    font-family: var(--font-code);
    font-size: 0.8rem;
    padding: 0.3rem 0.8rem;
    background: rgba(255, 107, 53, 0.1);
    border: 1px solid var(--accent-warning);
    border-radius: 4px;
    color: var(--accent-warning);
}

.project-footer {
    margin-top: auto;
}

.project-link {
    color: var(--accent-primary);
    text-decoration: none;
    font-family: var(--font-code);
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    transition: all 0.3s ease;
}

.project-link:hover {
    gap: 0.5rem;
}

/* Contact */
.contact-section {
    background: var(--secondary-bg);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 4rem;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    transition: all 0.3s ease;
}

.contact-card:hover {
    border-color: var(--accent-primary);
    box-shadow: 0 10px 30px var(--shadow-color);
}

.contact-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.contact-card h3 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.contact-card p {
    color: var(--accent-primary);
    font-family: var(--font-code);
    font-size: 0.9rem;
}

.contact-card a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-block;
}

.contact-card a:hover {
    color: var(--accent-secondary);
    transform: translateX(5px);
}

.contact-form-container {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
}

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

.form-group label {
    display: block;
    font-family: var(--font-code);
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    background: var(--primary-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(0, 255, 136, 0.1);
}

/* Footer */
.footer {
    background: var(--primary-bg);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-code);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 968px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        padding-top: 6rem;
    }
    
    .hero-title {
        font-size: 3.5rem;
    }
    
    .hero-stats {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .cta-buttons {
        justify-content: center;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .projects-grid,
    .certifications-grid,
    .courses-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-menu {
        display: none;
    }
    
    .mobile-toggle {
        display: flex;
    }
}

@media (max-width: 640px) {
    :root {
        --section-padding: 60px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
    
    .timeline-item {
        padding-left: 2rem;
    }
    
    .expertise-grid,
    .certifications-grid,
    .projects-grid,
    .courses-grid {
        grid-template-columns: 1fr;
    }
    
    .degree-card {
        padding: 2rem;
    }
}
/* Blog-specific styles - Add to your existing styles.css */

/* Blog Header */
.blog-header {
    padding: 10rem 0 4rem;
    text-align: center;
    position: relative;
}

.blog-header-content {
    max-width: 800px;
    margin: 0 auto;
}

.blog-title {
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 900;
    margin-bottom: 1rem;
    text-transform: uppercase;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.blog-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-family: var(--font-code);
}

/* Blog Categories */
.blog-categories {
    padding: 2rem 0;
    background: var(--secondary-bg);
    position: sticky;
    top: 72px;
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
}

.categories-filter {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.category-btn {
    padding: 0.6rem 1.2rem;
    font-family: var(--font-code);
    font-size: 0.85rem;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.category-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.category-btn.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: var(--primary-bg);
}

/* Blog Articles */
.blog-articles {
    padding: 4rem 0 6rem;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    gap: 2.5rem;
}

.article-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    opacity: 1;
    transform: translateY(0);
}

.article-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-primary);
    box-shadow: 0 15px 40px var(--shadow-color);
}

.article-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
}

.article-meta {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.article-date,
.article-reading-time {
    font-family: var(--font-code);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.article-category {
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    font-family: var(--font-code);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
}

.article-category.ai-ml {
    background: rgba(157, 78, 221, 0.2);
    border: 1px solid var(--accent-ai);
    color: var(--accent-ai);
}

.article-category.cybersecurity {
    background: rgba(255, 107, 53, 0.2);
    border: 1px solid var(--accent-warning);
    color: var(--accent-warning);
}

.article-category.infrastructure {
    background: rgba(0, 212, 255, 0.2);
    border: 1px solid var(--accent-secondary);
    color: var(--accent-secondary);
}

.article-category.career {
    background: rgba(0, 255, 136, 0.2);
    border: 1px solid var(--accent-primary);
    color: var(--accent-primary);
}

.article-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.article-title a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.article-title a:hover {
    color: var(--accent-primary);
}

.article-excerpt {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.article-link {
    color: var(--accent-primary);
    text-decoration: none;
    font-family: var(--font-code);
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    transition: all 0.3s ease;
    margin-top: auto;
}

.article-link:hover {
    gap: 0.5rem;
    color: var(--accent-secondary);
}

/* No Articles Message */
.no-articles {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
    font-family: var(--font-code);
}

/* Newsletter Section */
.newsletter-section {
    padding: 4rem 0;
    background: var(--secondary-bg);
}

.newsletter-card {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 3rem;
}

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

.newsletter-card p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.7;
}

.newsletter-form {
    display: flex;
    gap: 1rem;
}

.newsletter-form input {
    flex: 1;
    padding: 0.8rem;
    background: var(--primary-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.newsletter-form input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(0, 255, 136, 0.1);
}

/* Article Page Styles */
.article-page {
    padding: 10rem 0 4rem;
}

.article-content {
    max-width: 800px;
    margin: 0 auto;
}

.article-page .article-title {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.article-body {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.article-body h2 {
    font-family: var(--font-display);
    color: var(--text-primary);
    font-size: 2rem;
    margin: 3rem 0 1.5rem;
}

.article-body h3 {
    font-family: var(--font-display);
    color: var(--text-primary);
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
}

.article-body p {
    margin-bottom: 1.5rem;
}

.article-body ul,
.article-body ol {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

.article-body li {
    margin-bottom: 0.5rem;
}

.article-body code {
    background: var(--secondary-bg);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: var(--font-code);
    font-size: 0.9em;
    color: var(--accent-primary);
}

.article-body pre {
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    overflow-x: auto;
    margin-bottom: 1.5rem;
}

.article-body pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
}

.article-body blockquote {
    border-left: 4px solid var(--accent-primary);
    padding-left: 1.5rem;
    margin: 2rem 0;
    font-style: italic;
    color: var(--text-secondary);
}

.article-body img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 2rem 0;
}

/* Author Bio */
.author-bio {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    margin-top: 4rem;
    display: flex;
    gap: 2rem;
    align-items: center;
}

.author-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
}

.author-info h4 {
    font-family: var(--font-display);
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.author-info p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Share Buttons */
.article-share {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.article-share h4 {
    font-family: var(--font-code);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

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

.share-btn {
    padding: 0.6rem 1.2rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-secondary);
    text-decoration: none;
    font-family: var(--font-code);
    font-size: 0.85rem;
    transition: all 0.3s ease;
}

.share-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* Responsive */
@media (max-width: 968px) {
    .blog-title {
        font-size: 3rem;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .newsletter-form {
        flex-direction: column;
    }
    
    .author-bio {
        flex-direction: column;
        text-align: center;
    }
    
    .article-page .article-title {
        font-size: 2rem;
    }
}

@media (max-width: 640px) {
    .blog-header {
        padding: 8rem 0 3rem;
    }
    
    .blog-title {
        font-size: 2.5rem;
    }
    
    .categories-filter {
        gap: 0.5rem;
    }
    
    .category-btn {
        font-size: 0.75rem;
        padding: 0.5rem 1rem;
    }
    
    .share-buttons {
        flex-direction: column;
    }
}

/* Filter Animation */
.article-card.fade-out {
    opacity: 0;
    transform: scale(0.9);
}

.article-card.fade-in {
    animation: fadeInUp 0.5s ease forwards;
}

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

/* Videos Section */
.videos-section {
    background: var(--primary-bg);
}

.youtube-channel-card {
    max-width: 800px;
    margin: 0 auto 4rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 3rem;
    transition: all 0.3s ease;
}

.youtube-channel-card:hover {
    border-color: var(--accent-primary);
    box-shadow: 0 10px 40px var(--shadow-color);
}

.channel-header {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.channel-icon {
    font-size: 4rem;
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, #ff0000, #cc0000);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.channel-name {
    font-family: var(--font-display);
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

.subscribe-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

/* Videos Grid */
.videos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2.5rem;
    margin-bottom: 3rem;
}

.video-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.video-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-primary);
    box-shadow: 0 15px 40px var(--shadow-color);
}

.video-card.featured {
    grid-column: span 2;
}

.video-thumbnail {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    background: var(--secondary-bg);
    overflow: hidden;
}

.video-thumbnail iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.video-thumbnail a {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
}

.video-thumbnail img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.play-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 70px;
    height: 70px;
    background: rgba(0, 255, 136, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary-bg);
    transition: all 0.3s ease;
    padding-left: 5px;
}

.video-card:hover .play-button {
    background: var(--accent-primary);
    transform: translate(-50%, -50%) scale(1.1);
}

.video-content {
    padding: 1.5rem;
}

.video-title {
    font-family: var(--font-display);
    font-size: 1.2rem;
    margin-bottom: 0.8rem;
    color: var(--text-primary);
    line-height: 1.3;
}

.video-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.video-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.video-category {
    font-family: var(--font-code);
    font-size: 0.75rem;
    padding: 0.3rem 0.8rem;
    background: rgba(0, 255, 136, 0.1);
    border: 1px solid var(--accent-primary);
    border-radius: 4px;
    color: var(--accent-primary);
}

.video-date {
    font-family: var(--font-code);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.videos-cta {
    text-align: center;
    margin-top: 3rem;
}

/* Responsive Videos */
@media (max-width: 968px) {
    .channel-header {
        flex-direction: column;
        text-align: center;
    }
    
    .video-card.featured {
        grid-column: span 1;
    }
    
    .videos-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .youtube-channel-card {
        padding: 2rem;
    }
    
    .channel-icon {
        width: 80px;
        height: 80px;
        font-size: 3rem;
    }
    
    .channel-name {
        font-size: 1.5rem;
    }
}