/* Timeline period professional style */
.timeline-header .timeline-period {
  display: block;
  font-size: 1rem;
  color: var(--primary-color);
  font-weight: 500;
  margin-top: 0.1em;
  margin-bottom: 0.2em;
  letter-spacing: 0.01em;
}
[data-theme="dark"] .timeline-header .timeline-period {
    color: var(--primary-light);
}
/* Modern Portfolio CSS - Mobile-First Responsive Design */

/* CSS Custom Properties for Theming */
:root {
    /* Colors - Light Theme - Enhanced Palette */
    --primary-color: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --primary-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    --secondary-color: #f59e0b;
    --accent-color: #10b981;
    --accent-light: #34d399;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-card: #ffffff;
    --bg-overlay: rgba(255, 255, 255, 0.98);
    --bg-glass: rgba(255, 255, 255, 0.8);
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --text-inverse: #ffffff;
    
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    --shadow-color: rgba(15, 23, 42, 0.06);
    --shadow-strong: rgba(15, 23, 42, 0.12);
    --shadow-primary: rgba(99, 102, 241, 0.25);
    
    /* Typography - reduced font weights for faster loading */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* Layout */
    --container-max-width: 1200px;
    --container-padding: 1rem;
    --nav-height: 60px;
    --section-padding: 3rem 0;
    
    /* Mobile-specific */
    --tap-target-size: 44px;
    
    /* Borders & Radius */
    --border-radius-sm: 0.375rem;
    --border-radius: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
    --border-radius-full: 9999px;
    
    /* Shadows - Enhanced for better depth */
    --shadow-sm: 0 1px 2px 0 var(--shadow-color);
    --shadow: 0 1px 3px 0 var(--shadow-color), 0 1px 2px -1px var(--shadow-color);
    --shadow-md: 0 4px 6px -1px var(--shadow-color), 0 2px 4px -2px var(--shadow-color);
    --shadow-lg: 0 10px 15px -3px var(--shadow-color), 0 4px 6px -4px var(--shadow-color);
    --shadow-xl: 0 25px 50px -12px var(--shadow-strong);
    --shadow-2xl: 0 35px 60px -15px var(--shadow-strong);
    --shadow-glow: 0 0 40px var(--shadow-primary);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
    
    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal: 1040;
    --z-popover: 1050;
    --z-tooltip: 1060;
}

/* Dark Theme - Enhanced */
[data-theme="dark"] {
    --bg-primary: #0a0f1a;
    --bg-secondary: #111827;
    --bg-tertiary: #1f2937;
    --bg-card: #151c2c;
    --bg-overlay: rgba(10, 15, 26, 0.98);
    --bg-glass: rgba(21, 28, 44, 0.85);
    
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    
    --border-color: #1e293b;
    --border-light: #334155;
    --shadow-color: rgba(0, 0, 0, 0.4);
    --shadow-strong: rgba(0, 0, 0, 0.6);
    --shadow-primary: rgba(99, 102, 241, 0.3);
}

/* Reset & Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    line-height: var(--line-height-normal);
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
}

/* Improve touch scrolling on iOS */
body, main, section {
    -webkit-overflow-scrolling: touch;
}

/* Selection styles */
::selection {
    background: var(--primary-color);
    color: white;
}

/* Focus styles for accessibility */
:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-color);
    color: white;
    padding: var(--space-3) var(--space-6);
    border-radius: var(--border-radius);
    font-weight: var(--font-weight-medium);
    z-index: var(--z-tooltip);
    transition: top var(--transition-fast);
    text-decoration: none;
}

.skip-link:focus {
    top: var(--space-4);
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color var(--transition-normal), color var(--transition-normal);
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    color: var(--text-primary);
    margin-bottom: var(--space-4);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-4);
}

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

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

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
    will-change: opacity, visibility;
}

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

.loader {
    text-align: center;
}

.loader-ring {
    width: 60px;
    height: 60px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    will-change: transform;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--space-4);
}

.loader-text {
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
}

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

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

/* Navigation - Enhanced */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: var(--bg-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    z-index: var(--z-fixed);
    transition: all var(--transition-normal);
}

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

.nav-brand {
    display: flex;
    align-items: center;
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    text-decoration: none;
}

.brand-icon {
    width: 42px;
    height: 42px;
    background: var(--primary-gradient);
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: var(--font-weight-bold);
    margin-right: var(--space-3);
    box-shadow: 0 4px 14px var(--shadow-primary);
    transition: transform var(--transition-fast);
}

.nav-brand:hover .brand-icon {
    transform: rotate(-5deg) scale(1.05);
}

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

/* Navigation Menu - Mobile First */
.nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-card);
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
}

.nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
}

.nav-link {
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
    padding: var(--space-3) 0;
    position: relative;
    transition: color var(--transition-fast);
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    border-radius: var(--border-radius-full);
    transition: width var(--transition-normal);
}

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

/* Navigation Controls */
.nav-controls {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.theme-toggle,
.nav-toggle {
    width: 44px;
    height: 44px;
    border: none;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid var(--border-light);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.theme-toggle:hover,
.nav-toggle:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: scale(1.05);
    box-shadow: 0 4px 14px var(--shadow-primary);
}

/* Active state for touch devices */
.theme-toggle:active,
.nav-toggle:active {
    transform: scale(0.95);
}

.nav-toggle {
    flex-direction: column;
    gap: 4px;
}

.nav-toggle span {
    width: 20px;
    height: 2px;
    background: currentColor;
    border-radius: var(--border-radius-full);
    transition: all var(--transition-fast);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Desktop Navigation */
@media (min-width: 768px) {
    .nav-menu {
        position: static;
        flex-direction: row;
        background: transparent;
        padding: 0;
        transform: none;
        opacity: 1;
        visibility: visible;
        border: none;
        box-shadow: none;
    }
    
    .nav-toggle {
        display: none;
    }
    
    .nav-link {
        padding: var(--space-2) var(--space-4);
    }
    
    .nav-link.active::after {
        bottom: -10px;
    }
}

/* Buttons - Enhanced */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-8);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    line-height: 1;
    text-decoration: none;
    border: none;
    border-radius: var(--border-radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    letter-spacing: 0.025em;
    min-height: var(--tap-target-size);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.btn:hover::before {
    opacity: 1;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-md), 0 4px 14px var(--shadow-primary);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl), 0 8px 25px var(--shadow-primary);
    color: white;
}

.btn-primary:active {
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-glass);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--primary-light);
    transform: translateY(-3px);
    color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

/* Hero Section - Enhanced */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: calc(var(--nav-height) + 3rem) 0 var(--space-20);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(168, 85, 247, 0.06) 0%, transparent 50%),
        linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.hero-particles {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 20%, var(--primary-color) 1.5px, transparent 1.5px),
        radial-gradient(circle at 80% 80%, var(--accent-color) 1px, transparent 1px),
        radial-gradient(circle at 40% 60%, var(--secondary-color) 1px, transparent 1px);
    background-size: 120px 120px, 180px 180px, 150px 150px;
    opacity: 0.15;
    animation: float 25s infinite linear;
}

@keyframes float {
    0% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
    100% { transform: translateY(0px) rotate(360deg); }
}

.hero-content {
    display: grid;
    gap: var(--space-12);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-greeting {
    font-size: var(--font-size-lg);
    color: var(--primary-color);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--space-2);
}

.hero-title {
    margin-bottom: var(--space-6);
}

.title-main {
    display: block;
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
    margin-bottom: var(--space-3);
    letter-spacing: -0.02em;
}

.title-sub {
    display: block;
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
    letter-spacing: 0.01em;
}

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-8);
    max-width: 600px;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

.stat-item {
    text-align: center;
    padding: var(--space-4);
    background: var(--bg-glass);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-light);
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.stat-number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: var(--space-1);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    font-weight: var(--font-weight-medium);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero-cta {
    display: flex;
    gap: var(--space-4);
    flex-wrap: wrap;
}

.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-image-wrapper {
    position: relative;
    padding: var(--space-12);
}

.hero-image {
    position: relative;
    width: 220px;
    height: 220px;
    border-radius: 50%;
    overflow: hidden;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-2xl), 0 0 60px var(--shadow-primary);
    border: 4px solid rgba(255, 255, 255, 0.15);
}

.profile-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform var(--transition-slow);
}

.hero-image:hover .profile-image {
    transform: scale(1.08);
}

.floating-elements {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.floating-tech {
    position: absolute;
    width: 58px;
    height: 58px;
    background: var(--bg-card);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--primary-color);
    box-shadow: var(--shadow-lg), 0 0 25px var(--shadow-primary);
    animation: floating 4s ease-in-out infinite;
    border: 3px solid var(--border-light);
    pointer-events: auto;
    transition: all var(--transition-normal);
}

.floating-tech:hover {
    transform: scale(1.15);
    box-shadow: var(--shadow-xl), 0 0 35px var(--shadow-primary);
    color: var(--primary-light);
}

/* Orbital positioning - diagonal corners */
.floating-tech:nth-child(1) {
    top: 5%;
    right: 5%;
    animation-delay: 0s;
}

.floating-tech:nth-child(2) {
    top: 5%;
    left: 5%;
    animation-delay: 1s;
}

.floating-tech:nth-child(3) {
    bottom: 5%;
    right: 5%;
    animation-delay: 2s;
}

.floating-tech:nth-child(4) {
    bottom: 5%;
    left: 5%;
    animation-delay: 3s;
}

@keyframes floating {
    0%, 100% { 
        transform: translateY(0px); 
    }
    50% { 
        transform: translateY(-12px); 
    }
}

@keyframes floating {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.scroll-indicator {
    position: absolute;
    bottom: var(--space-8);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--text-muted);
}

.scroll-arrow {
    animation: bounce 2s infinite;
    will-change: transform;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .floating-tech,
    .scroll-arrow,
    .loader-ring,
    .hero-particles {
        animation: none !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* Tablet Hero Layout */
@media (min-width: 768px) {
    :root {
        --nav-height: 70px;
        --section-padding: 4rem 0;
    }
    
    .hero-content {
        grid-template-columns: 1fr 1fr;
    }
    
    .title-main {
        font-size: var(--font-size-4xl);
    }
    
    .title-sub {
        font-size: var(--font-size-xl);
    }
    
    .hero-stats {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .hero-image {
        width: 280px;
        height: 280px;
    }
    
    .hero-visual {
        order: 0;
    }
}

/* Desktop Hero Layout */
@media (min-width: 1024px) {
    .title-main {
        font-size: var(--font-size-5xl);
    }
    
    .title-sub {
        font-size: var(--font-size-2xl);
    }
    
    .hero-image {
        width: 320px;
        height: 320px;
        border-width: 5px;
    }
    
    .floating-tech {
        width: 58px;
        height: 58px;
        font-size: 24px;
    }
}

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

/* Content visibility optimization for below-the-fold sections */
section:not(.hero) {
    content-visibility: auto;
    contain-intrinsic-size: auto 500px;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-16);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.section-tag {
    display: inline-block;
    padding: var(--space-2) var(--space-5);
    background: var(--primary-gradient);
    color: white;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--border-radius-full);
    margin-bottom: var(--space-5);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    box-shadow: 0 4px 14px var(--shadow-primary);
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-4);
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
    max-width: 560px;
    margin: 0 auto;
}

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

.about-content {
    display: grid;
    gap: var(--space-12);
    align-items: start;
}

.about-story p {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-6);
}

.about-highlights {
    display: grid;
    gap: var(--space-6);
    margin-top: var(--space-8);
}

.highlight-item {
    display: flex;
    gap: var(--space-5);
    padding: var(--space-6);
    background: var(--bg-card);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.highlight-item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.highlight-item i {
    font-size: 28px;
    color: var(--primary-color);
    flex-shrink: 0;
    margin-top: var(--space-1);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.highlight-item h4 {
    margin-bottom: var(--space-2);
}

.highlight-item p {
    margin: 0;
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

.skills-preview {
    background: var(--bg-card);
    padding: var(--space-8);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-lg);
}

.skill-category {
    margin-bottom: var(--space-6);
}

.skill-category:last-child {
    margin-bottom: 0;
}

.skill-category h4 {
    margin-bottom: var(--space-4);
    color: var(--text-primary);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.skill-tag {
    padding: var(--space-2) var(--space-3);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

@media (min-width: 768px) {
    .about-content {
        grid-template-columns: 1fr 1fr;
    }
    
    .about-highlights {
        grid-template-columns: 1fr;
    }
}

/* Skills Section */
.skills-grid {
    display: grid;
    gap: var(--space-8);
}

.skill-card {
    background: var(--bg-card);
    padding: var(--space-8);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.skill-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-normal);
}

.skill-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl), 0 0 30px var(--shadow-primary);
    border-color: var(--primary-light);
}

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

.skill-icon {
    width: 64px;
    height: 64px;
    background: var(--primary-gradient);
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    color: white;
    margin-bottom: var(--space-6);
    box-shadow: 0 8px 20px var(--shadow-primary);
}

.skill-card h3 {
    margin-bottom: var(--space-4);
}

.skill-card p {
    margin-bottom: var(--space-6);
    color: var(--text-secondary);
}

.skill-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-6);
}

.skill-tech span {
    padding: var(--space-2) var(--space-4);
    background: var(--primary-gradient);
    color: white;
    font-size: var(--font-size-xs);
    border-radius: var(--border-radius-full);
    font-weight: var(--font-weight-semibold);
    letter-spacing: 0.02em;
    box-shadow: 0 2px 8px var(--shadow-primary);
}

.skill-progress {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius-full);
    overflow: hidden;
    position: relative;
}

.progress-bar {
    height: 100%;
    background: var(--primary-gradient);
    border-radius: var(--border-radius-full);
    width: 0;
    transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 2s infinite;
}

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

@media (min-width: 640px) {
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .skills-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

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

.projects-grid {
    display: grid;
    gap: var(--space-8);
}

.project-card {
    background: var(--bg-card);
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

.project-card:hover {
    transform: translateY(-8px) scale(1.01);
    box-shadow: var(--shadow-xl), 0 0 30px var(--shadow-primary);
    border-color: var(--primary-light);
}

.project-image {
    position: relative;
    height: 220px;
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
    overflow: hidden;
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.9), rgba(139, 92, 246, 0.9));
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-links {
    display: flex;
    gap: var(--space-4);
}

.project-link {
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.project-link:hover {
    background: var(--primary-light);
    transform: scale(1.1);
    color: white;
}

.project-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    color: var(--text-muted);
}

.project-content {
    padding: var(--space-8);
}

.project-content h3 {
    margin-bottom: var(--space-4);
}

.project-content p {
    margin-bottom: var(--space-6);
    color: var(--text-secondary);
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-6);
}

.project-tech span {
    padding: var(--space-1) var(--space-3);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: var(--font-size-xs);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.project-stats {
    display: flex;
    gap: var(--space-6);
}

.stat {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--primary-color);
}

.stat-label {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    font-weight: var(--font-weight-medium);
}

@media (min-width: 768px) {
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .projects-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Experience Section: Vertical Stacked Carousel */
.experience {
    --xp-accent: #334155;
    --xp-text-muted: #475569;
    --xp-border: #e2e8f0;
    --xp-panel-bg: #ffffff;
    --xp-tag-bg: #e2e8f0;
    --xp-tag-text: #334155;
    --xp-shadow-light: 0 10px 25px rgba(15, 23, 42, 0.06);
    --xp-transition: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --xp-track-x: 1.25rem;
    --xp-gap: 1rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

[data-theme="dark"] .experience {
    --xp-accent: #22d3ee;
    --xp-text-muted: #94a3b8;
    --xp-border: #1f2937;
    --xp-panel-bg: #0f172a;
    --xp-tag-bg: rgba(34, 211, 238, 0.12);
    --xp-tag-text: #67e8f9;
    --xp-shadow-light: 0 0 0 1px rgba(34, 211, 238, 0.25), 0 0 24px rgba(34, 211, 238, 0.14);
}

.experience-track {
    position: relative;
    display: grid;
    gap: var(--xp-gap);
    margin: 0 auto;
    max-width: 920px;
    padding-left: calc(var(--xp-track-x) + 1.75rem);
}

.experience-track::before {
    content: '';
    position: absolute;
    top: 0.5rem;
    bottom: 0.5rem;
    left: var(--xp-track-x);
    width: 2px;
    background: linear-gradient(to bottom, transparent, var(--xp-border), transparent);
}

.xp-card {
    position: relative;
    border: 1px solid var(--xp-border);
    border-radius: var(--border-radius-xl);
    background: var(--bg-secondary);
    box-shadow: var(--xp-shadow-light);
    overflow: clip;
    transition: border-color var(--xp-transition), box-shadow var(--xp-transition), transform var(--xp-transition);
}

.xp-card:hover {
    transform: translateY(-2px);
}

.xp-card.is-active {
    border-color: var(--xp-accent);
}

.xp-card__dot {
    position: absolute;
    left: calc(-1 * (var(--xp-track-x) + 1.25rem));
    top: 2.1rem;
    width: 0.85rem;
    height: 0.85rem;
    border-radius: var(--border-radius-full);
    background: var(--bg-secondary);
    border: 2px solid var(--xp-border);
    transition: background-color var(--xp-transition), border-color var(--xp-transition), box-shadow var(--xp-transition);
}

.xp-card.is-active .xp-card__dot {
    background: var(--xp-accent);
    border-color: var(--xp-accent);
    box-shadow: 0 0 0 6px color-mix(in srgb, var(--xp-accent) 20%, transparent);
}

.xp-card__header {
    width: 100%;
    display: grid;
    grid-template-columns: auto 1fr;
    grid-template-rows: auto auto auto;
    align-items: center;
    column-gap: 0.85rem;
    row-gap: 0.2rem;
    text-align: left;
    border: 0;
    background: transparent;
    color: inherit;
    cursor: pointer;
    padding: 1.35rem 1.25rem 1.25rem;
}

.xp-card__logo {
    grid-column: 1;
    grid-row: 1 / span 3;
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    border: 1px solid var(--xp-border);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--xp-text-muted);
}

.xp-card__company {
    grid-column: 2;
    font-size: 0.77rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--xp-text-muted);
    font-weight: 600;
}

.xp-card__title {
    grid-column: 2;
    font-size: clamp(1rem, 1.4vw, 1.25rem);
    line-height: 1.3;
    font-weight: 600;
    color: var(--text-primary);
}

.xp-card__date {
    grid-column: 2;
    font-size: 0.84rem;
    font-weight: 500;
    font-style: italic;
    color: var(--xp-accent);
}

.xp-card__panel {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    background: var(--xp-panel-bg);
    border-top: 1px solid transparent;
    transition: max-height var(--xp-transition), opacity 0.25s ease-out, border-color var(--xp-transition), padding var(--xp-transition);
    padding: 0 1.25rem;
}

.xp-card.is-active .xp-card__panel {
    max-height: 42rem;
    opacity: 1;
    border-color: var(--xp-border);
    padding: 1rem 1.25rem 1.25rem;
}

.xp-card__summary {
    margin: 0 0 0.75rem;
    color: var(--xp-text-muted);
    line-height: 1.65;
}

.xp-card__bullets {
    margin: 0 0 1rem;
    padding-left: 1.15rem;
    display: grid;
    gap: 0.5rem;
}

.xp-card__bullets li {
    color: var(--xp-text-muted);
    line-height: 1.6;
}

.xp-card__skills {
    display: grid;
    gap: 0.85rem;
    grid-template-columns: 1fr;
}

.xp-skill-group__title {
    margin: 0 0 0.45rem;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--xp-text-muted);
    font-weight: 600;
}

.xp-skill-group__list {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
}

.xp-skill-group__list li {
    padding: 0.35rem 0.7rem;
    border-radius: var(--border-radius-full);
    background: var(--xp-tag-bg);
    color: var(--xp-tag-text);
    border: 1px solid color-mix(in srgb, var(--xp-accent) 24%, var(--xp-border));
    font-size: 0.75rem;
    font-weight: 500;
}

@media (min-width: 768px) {
    .xp-card__header {
        padding: 1.55rem 1.5rem 1.45rem;
    }

    .xp-card.is-active .xp-card__panel {
        padding: 1.1rem 1.5rem 1.4rem;
    }

    .xp-card__skills {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (prefers-reduced-motion: reduce) {
    .xp-card,
    .xp-card__dot,
    .xp-card__panel {
        transition: none;
    }
}

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

.contact-content {
    display: grid;
    gap: var(--space-12);
    align-items: start;
}

.contact-info-centered {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.contact-grid {
    display: grid;
    gap: var(--space-6);
    margin-bottom: var(--space-12);
}

.contact-item {
    display: flex;
    gap: var(--space-4);
    padding: var(--space-6);
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

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

.contact-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: white;
    flex-shrink: 0;
}

.contact-details h4 {
    margin-bottom: var(--space-2);
    color: var(--text-primary);
    font-weight: var(--font-weight-semibold);
}

.contact-details p {
    margin-bottom: var(--space-2);
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
}

.contact-link {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--primary-color);
    text-decoration: none;
    padding: var(--space-2) var(--space-4);
    border: 1px solid var(--primary-color);
    border-radius: var(--border-radius);
    display: inline-block;
    transition: all var(--transition-fast);
}

.contact-link:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-1px);
}

.contact-availability {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    font-style: italic;
    margin-top: var(--space-2);
}

.contact-cta {
    background: var(--bg-card);
    padding: var(--space-12);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
    margin-bottom: var(--space-12);
    position: relative;
    overflow: hidden;
}

.contact-cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
}

.contact-cta h3 {
    color: var(--text-primary);
    margin-bottom: var(--space-4);
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
}

.contact-cta p {
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
    font-size: var(--font-size-lg);
}

.cta-buttons {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
}

.social-links {
    text-align: center;
}

.social-links h4 {
    color: var(--text-primary);
    margin-bottom: var(--space-4);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
}

.social-items {
    display: flex;
    gap: var(--space-6);
    justify-content: center;
    flex-wrap: wrap;
}

.social-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-6);
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-xl);
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-normal);
    font-weight: var(--font-weight-semibold);
}

.social-link:hover {
    background: var(--primary-gradient);
    color: white;
    border-color: transparent;
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), 0 8px 25px var(--shadow-primary);
}

.social-link i,
.social-link svg {
    font-size: 22px;
    width: 22px;
    height: 22px;
    fill: currentColor;
    flex-shrink: 0;
}

@media (min-width: 768px) {
    .contact-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
    
    .cta-buttons {
        flex-wrap: nowrap;
    }
}

/* Footer - Enhanced */
.footer {
    background: linear-gradient(180deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
    padding: var(--space-20) 0 var(--space-8);
    text-align: center;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 10%;
    right: 10%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-light), transparent);
}

.footer-content {
    margin-bottom: var(--space-10);
}

.footer-brand {
    display: inline-flex;
    align-items: center;
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    margin-bottom: var(--space-4);
}

.footer-brand .brand-icon {
    margin-right: var(--space-3);
}

.footer-text {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--space-6);
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: var(--space-8);
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    flex-wrap: wrap;
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.footer-bottom i {
    color: #ef4444;
}

/* Back to Top Button - Enhanced */
.back-to-top {
    position: fixed;
    bottom: var(--space-8);
    right: var(--space-8);
    width: 52px;
    height: 52px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--border-radius-xl);
    cursor: pointer;
    box-shadow: var(--shadow-lg), 0 8px 25px var(--shadow-primary);
    transition: all var(--transition-normal);
    opacity: 0;
    visibility: hidden;
    transform: translateY(100px) scale(0.8);
    z-index: var(--z-sticky);
}

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

.back-to-top:hover {
    transform: translateY(-5px) scale(1.1);
    box-shadow: var(--shadow-xl), 0 12px 35px var(--shadow-primary);
}

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

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

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

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

.animate-fadeInUp {
    animation: fadeInUp 0.6s ease-out;
}

.animate-fadeInLeft {
    animation: fadeInLeft 0.6s ease-out;
}

.animate-fadeInRight {
    animation: fadeInRight 0.6s ease-out;
}

/* Mobile-First Responsive Enhancements */

/* Extra small devices (phones, 320px and up) */
@media (max-width: 359px) {
    :root {
        --container-padding: 0.75rem;
        --section-padding: 2rem 0;
    }
    
    .title-main {
        font-size: var(--font-size-2xl);
    }
    
    .title-sub {
        font-size: var(--font-size-base);
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
    
    .hero-image {
        width: 180px;
        height: 180px;
    }
    
    .floating-tech {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }
    
    .stat-number {
        font-size: var(--font-size-xl);
    }
    
    .stat-label {
        font-size: var(--font-size-xs);
    }
}

/* Small devices (phones, 360px to 479px) */
@media (min-width: 360px) and (max-width: 479px) {
    :root {
        --container-padding: 1rem;
        --section-padding: 2.5rem 0;
    }
    
    .title-main {
        font-size: var(--font-size-2xl);
    }
    
    .title-sub {
        font-size: var(--font-size-lg);
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
    
    .hero-image {
        width: 200px;
        height: 200px;
    }
}

/* Medium phones (480px to 639px) */
@media (min-width: 480px) and (max-width: 639px) {
    :root {
        --container-padding: 1.25rem;
        --section-padding: 3rem 0;
    }
    
    .title-main {
        font-size: var(--font-size-3xl);
    }
    
    .hero-image {
        width: 240px;
        height: 240px;
    }
    
    .hero-stats {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Small tablets (640px to 767px) */
@media (min-width: 640px) and (max-width: 767px) {
    :root {
        --nav-height: 65px;
        --section-padding: 3.5rem 0;
    }
    
    .title-main {
        font-size: var(--font-size-4xl);
    }
    
    .hero-image {
        width: 280px;
        height: 280px;
    }
}

/* Responsive Design Enhancements - General Mobile */
@media (max-width: 480px) {
    .title-main {
        font-size: var(--font-size-3xl);
    }
    
    .title-sub {
        font-size: var(--font-size-lg);
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .btn {
        justify-content: center;
        width: 100%;
        padding: var(--space-4) var(--space-6);
        font-size: var(--font-size-base);
    }
    
    /* Mobile navigation improvements */
    .nav-menu {
        padding: var(--space-4);
        max-height: calc(100vh - var(--nav-height));
        overflow-y: auto;
    }
    
    .nav-link {
        padding: var(--space-4) var(--space-3);
        font-size: var(--font-size-base);
    }
    
    /* Mobile hero adjustments */
    .hero-visual {
        order: -1;
        margin-bottom: var(--space-6);
    }
    
    .hero-image-wrapper {
        padding: var(--space-6);
    }
    
    .floating-tech {
        width: 44px;
        height: 44px;
        font-size: 18px;
    }
    
    .hero-description {
        font-size: var(--font-size-base);
    }
    
    /* Mobile stats */
    .hero-stats {
        gap: var(--space-3);
    }
    
    .stat-item {
        padding: var(--space-3);
    }
    
    .stat-number {
        font-size: var(--font-size-2xl);
    }
    
    /* Mobile sections */
    .section-header {
        margin-bottom: var(--space-10);
    }
    
    .section-tag {
        font-size: var(--font-size-xs);
        padding: var(--space-1) var(--space-4);
    }
    
    /* Mobile cards */
    .skill-card {
        padding: var(--space-6);
    }
    
    .skill-icon {
        width: 52px;
        height: 52px;
        font-size: 22px;
    }
    
    .project-card:hover,
    .skill-card:hover {
        transform: translateY(-4px);
    }
    
    /* Mobile timeline */
    .timeline-content {
        padding: var(--space-5);
    }
    
    .timeline-marker {
        width: 36px;
        height: 36px;
    }
    
    .timeline-icon {
        font-size: 14px;
    }
    
    /* Mobile contact */
    .contact-cta {
        padding: var(--space-8);
    }
    
    .contact-cta h3 {
        font-size: var(--font-size-xl);
    }
    
    .contact-item {
        flex-direction: column;
        text-align: center;
        padding: var(--space-5);
    }
    
    .contact-icon {
        margin: 0 auto;
    }
    
    /* Mobile social links */
    .social-link {
        padding: var(--space-3) var(--space-4);
        font-size: var(--font-size-sm);
    }
    
    .social-link i {
        font-size: 18px;
    }
    
    /* Mobile footer */
    .footer {
        padding: var(--space-12) 0 var(--space-6);
    }
    
    .footer-links {
        gap: var(--space-4);
    }
    
    /* Mobile back to top */
    .back-to-top {
        width: 44px;
        height: 44px;
        bottom: var(--space-4);
        right: var(--space-4);
    }
    
    /* Mobile certifications */
    .cert-item {
        padding: var(--space-4);
    }
    
    .cert-icon {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }
    
    .cert-info h4 {
        font-size: var(--font-size-sm);
    }
}

/* Mobile Landscape Optimization */
@media (max-height: 500px) and (orientation: landscape) {
    .hero {
        min-height: auto;
        padding: var(--space-20) 0 var(--space-8);
    }
    
    .hero-content {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-6);
    }
    
    .hero-visual {
        order: 0;
    }
    
    .hero-image {
        width: 150px;
        height: 150px;
    }
    
    .hero-image-wrapper {
        padding: var(--space-4);
    }
    
    .floating-tech {
        width: 32px;
        height: 32px;
        font-size: 14px;
    }
    
    .scroll-indicator {
        display: none;
    }
    
    .hero-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-2);
    }
    
    .stat-item {
        padding: var(--space-2);
    }
    
    .stat-number {
        font-size: var(--font-size-xl);
    }
}

/* Reduced Motion Accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .hero-particles,
    .floating-elements,
    .scroll-indicator,
    .back-to-top,
    .loading-screen {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
    
    .hero {
        min-height: auto;
        padding: 2rem 0;
    }
    
    section {
        padding: 2rem 0;
        break-inside: avoid;
    }
}

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

.certifications-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-10);
    margin-top: var(--space-10);
}

@media (min-width: 768px) {
    .certifications-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.cert-category h3 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--space-6);
    text-align: center;
    position: relative;
    padding-bottom: var(--space-3);
}

.cert-category h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: var(--primary-gradient);
    border-radius: var(--border-radius-full);
}

.cert-items {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.cert-item {
    background: var(--bg-card);
    border-radius: var(--border-radius-xl);
    padding: var(--space-5);
    display: flex;
    align-items: center;
    gap: var(--space-4);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

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

.cert-item.completed {
    border-left: 4px solid var(--accent-color);
}

.cert-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-gradient);
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
    flex-shrink: 0;
    box-shadow: 0 4px 12px var(--shadow-primary);
}

.cert-item.completed .cert-icon {
    background: linear-gradient(135deg, var(--accent-color), var(--accent-light));
}

.cert-info h4 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-1);
    line-height: 1.4;
}

.cert-date {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    font-weight: var(--font-weight-medium);
}