/* ===================================
   Global Styles & Reset
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary-color: #3B82F6;
    --primary-dark: #2563EB;
    --primary-light: #60A5FA;
    --secondary-color: #10B981;
    --accent-color: #F59E0B;
    --dark-bg: #0F172A;
    --dark-secondary: #1E293B;
    --dark-tertiary: #334155;
    --text-primary: #F1F5F9;
    --text-secondary: #CBD5E1;
    --text-muted: #94A3B8;
    --border-color: #475569;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
}

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
}

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

/* ===================================
   Typography
   =================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-sm);
}

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

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

.lead {
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--text-secondary);
}

/* ===================================
   Container & Layout
   =================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

section {
    padding: var(--spacing-xl) 0;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    position: relative;
    padding-bottom: var(--spacing-sm);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.section-subtitle {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
}

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-color);
}

.navbar .container {
    display: flex;
    justify-content: center;
    align-items: center;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-light);
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-menu a {
    color: var(--text-secondary);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-menu a:hover {
    color: var(--text-primary);
    background-color: var(--dark-secondary);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--dark-bg) 0%, var(--dark-secondary) 100%);
    position: relative;
    overflow: hidden;
    padding-top: 80px;
}

.hero::before {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.1) 0%, transparent 70%);
    top: -250px;
    right: -250px;
    border-radius: 50%;
}

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

.hero-title {
    font-size: 4rem;
    background: linear-gradient(135deg, var(--text-primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.hero-subtitle {
    font-size: 1.75rem;
    color: var(--text-secondary);
    font-weight: 400;
    margin-bottom: var(--spacing-md);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-muted);
    max-width: 600px;
    margin-bottom: var(--spacing-lg);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.stat {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--dark-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

.stat:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-light);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    cursor: pointer;
    text-align: center;
    border: 2px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(59, 130, 246, 0.3);
}

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

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
}

/* ===================================
   About Section
   =================================== */
.about {
    background-color: var(--dark-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-lg);
    align-items: start;
}

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

.highlights {
    margin-top: var(--spacing-lg);
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    background: var(--dark-bg);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--primary-color);
}

.highlight-icon {
    font-size: 1.5rem;
}

.info-card {
    background: var(--dark-bg);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    position: sticky;
    top: 100px;
}

.info-card h3 {
    color: var(--primary-light);
    margin-bottom: var(--spacing-md);
}

.info-card ul {
    list-style: none;
}

.info-card li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
}

.info-card li:last-child {
    border-bottom: none;
}

/* ===================================
   Experience Section
   =================================== */
.experience {
    background-color: var(--dark-bg);
}

.timeline {
    position: relative;
    padding-left: 3rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary-color), var(--secondary-color));
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-lg);
}

.timeline-marker {
    position: absolute;
    left: -3.4rem;
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border: 3px solid var(--dark-bg);
    border-radius: 50%;
}

.timeline-content {
    background: var(--dark-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

.timeline-content:hover {
    transform: translateX(10px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.timeline-content h3 {
    color: var(--primary-light);
    margin-bottom: var(--spacing-xs);
}

.timeline-content h4 {
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.timeline-date {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
}

.achievements {
    list-style: none;
}

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

.achievements li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

/* ===================================
   Skills Section
   =================================== */
.skills {
    background-color: var(--dark-secondary);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.skill-category {
    background: var(--dark-bg);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

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

.skill-category h3 {
    color: var(--primary-light);
    margin-bottom: var(--spacing-md);
    font-size: 1.25rem;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tag {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--dark-secondary);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.tag:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* ===================================
   Projects Section
   =================================== */
.projects {
    background-color: var(--dark-bg);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: var(--spacing-md);
}

.project-card {
    background: var(--dark-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}

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

.project-header {
    margin-bottom: var(--spacing-md);
}

.project-header h3 {
    color: var(--primary-light);
    margin-bottom: var(--spacing-sm);
}

.project-tag {
    display: inline-block;
    font-size: 0.875rem;
    color: var(--text-muted);
    background: var(--dark-bg);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
}

.project-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.project-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.highlight-badge {
    font-size: 0.875rem;
    padding: 0.375rem 0.875rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: var(--radius-sm);
    font-weight: 600;
}

.project-features {
    list-style: none;
    flex-grow: 1;
}

.project-features li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

.project-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

/* ===================================
   Certifications Section
   =================================== */
.certifications {
    background-color: var(--dark-secondary);
}

.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.cert-card {
    background: var(--dark-bg);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: all var(--transition-base);
}

.cert-card:hover {
    transform: translateY(-10px);
    border-color: var(--secondary-color);
    box-shadow: var(--shadow-xl);
}

.cert-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.cert-card h3 {
    color: var(--primary-light);
    margin-bottom: var(--spacing-sm);
}

.cert-issuer {
    color: var(--text-secondary);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.cert-date {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ===================================
   Education Section
   =================================== */
.education {
    background-color: var(--dark-bg);
}

.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-md);
}

.edu-card {
    background: var(--dark-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.edu-card h3 {
    color: var(--primary-light);
    margin-bottom: var(--spacing-md);
}

.edu-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.edu-card ul {
    list-style: none;
    color: var(--text-secondary);
}

.edu-card li {
    padding: var(--spacing-xs) 0;
    padding-left: 1.5rem;
    position: relative;
}

.edu-card li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
}

/* ===================================
   Contact Section
   =================================== */
.contact {
    background-color: var(--dark-secondary);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.contact-card {
    background: var(--dark-bg);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: all var(--transition-base);
}

.contact-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.contact-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.contact-card h3 {
    color: var(--primary-light);
    margin-bottom: var(--spacing-sm);
}

.contact-card a {
    color: var(--text-secondary);
    font-weight: 500;
}

.contact-card a.resume-download {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--primary-color);
    color: var(--bg-primary);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all var(--transition-base);
}

.contact-card a.resume-download:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--dark-bg);
    padding: var(--spacing-lg) 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.footer p {
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
}

.footer-note {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
    h1 { font-size: 3rem; }
    h2 { font-size: 2rem; }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
}

/* Mobile menu toggle button */
.mobile-menu-toggle {
    display: none;
}

@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    .hero-title { font-size: 2.5rem; }
    .hero-subtitle { font-size: 1.25rem; }
    
    /* Ultra-compact horizontal mobile navigation */
    .navbar {
        padding: 0.3rem 0;
        position: fixed !important;
        width: 100% !important;
    }
    
    .navbar .container {
        padding: 0;
        margin: 0;
        max-width: 100%;
        overflow-x: auto;
        overflow-y: hidden;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        display: flex !important;
        justify-content: flex-start !important;
    }
    
    .navbar .container::-webkit-scrollbar {
        display: none;
    }
    
    .nav-menu {
        display: flex !important;
        flex-direction: row !important;
        flex-wrap: nowrap !important;
        list-style: none;
        margin: 0;
        padding: 0 0.5rem;
        gap: 0.25rem;
        white-space: nowrap;
        width: auto;
        min-width: 100%;
        justify-content: flex-start;
        position: relative !important;
        top: auto !important;
        right: auto !important;
        left: auto !important;
        height: auto !important;
        background: transparent !important;
        box-shadow: none !important;
        border: none !important;
    }
    
    .nav-menu li {
        display: inline-block;
        flex-shrink: 0;
        margin: 0;
        padding: 0;
        border: none !important;
    }
    
    .nav-menu a {
        display: inline-block;
        font-size: 0.85rem;
        padding: 0.4rem 0.65rem;
        white-space: nowrap;
    }
    
    /* Hide any mobile toggle buttons */
    .mobile-menu-toggle,
    button[class*="mobile"],
    button[class*="toggle"] {
        display: none !important;
    }
    
    /* Add scroll padding to account for fixed navbar */
    html {
        scroll-padding-top: 45px;
    }
    
    /* Reduce hero padding on mobile */
    .hero {
        padding-top: 45px;
        min-height: 100vh;
    }
    
    /* Ensure sections aren't hidden behind navbar */
    section {
        scroll-margin-top: 45px;
        padding: var(--spacing-lg) 0;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .skills-grid,
    .education-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline {
        padding-left: 2rem;
    }
    
    .timeline-marker {
        left: -2.4rem;
    }
}

@media (max-width: 480px) {
    h1 { font-size: 2rem; }
    .hero-title { font-size: 2rem; }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .btn {
        width: 100%;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* ===================================
   Utility Classes
   =================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }