/* Apple-inspired Portfolio CSS */

/* CSS Custom Properties */
:root {
    /* Colors */
    --primary-color: #007AFF;
    --secondary-color: #5856D6;
    --accent-color: #FF9500;
    --success-color: #34C759;
    --text-primary: #1D1D1F;
    --text-secondary: #86868B;
    --background-primary: #FFFFFF;
    --background-secondary: #F5F5F7;
    --background-tertiary: #FBFBFD;
    --border-color: #D2D2D7;
    --shadow-light: rgba(0, 0, 0, 0.04);
    --shadow-medium: rgba(0, 0, 0, 0.08);
    --shadow-strong: rgba(0, 0, 0, 0.12);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 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;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    
    /* Layout */
    --container-max-width: 1200px;
    --border-radius: 12px;
    --border-radius-lg: 16px;
    --border-radius-xl: 24px;
    
    /* Animations */
    --transition-fast: 0.15s ease-out;
    --transition-base: 0.25s ease-out;
    --transition-slow: 0.35s ease-out;
}

/* Dark mode variables */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #F5F5F7;
        --text-secondary: #A1A1A6;
        --background-primary: #000000;
        --background-secondary: #1C1C1E;
        --background-tertiary: #2C2C2E;
        --border-color: #38383A;
        --shadow-light: rgba(255, 255, 255, 0.04);
        --shadow-medium: rgba(255, 255, 255, 0.08);
        --shadow-strong: rgba(255, 255, 255, 0.12);
    }
    
    /* Dark mode app icon adjustments */
    .app-icon-image {
        border: 1px solid rgba(255, 255, 255, 0.08);
        box-shadow: 
            0 8px 32px rgba(0, 0, 0, 0.3),
            0 4px 16px rgba(0, 0, 0, 0.2),
            0 1px 4px rgba(0, 0, 0, 0.1);
    }
    
    .app-icon-image:hover {
        box-shadow: 
            0 16px 48px rgba(0, 0, 0, 0.4),
            0 8px 24px rgba(0, 0, 0, 0.3),
            0 2px 8px rgba(0, 0, 0, 0.15);
    }
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-3xl); }
h4 { font-size: var(--font-size-2xl); }
h5 { font-size: var(--font-size-xl); }
h6 { font-size: var(--font-size-lg); }

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

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

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

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

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-4xl);
}

.section-header h2 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.section-header p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all var(--transition-base);
}

.nav-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
}

.nav-logo a {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

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

.nav-menu a {
    color: var(--text-secondary);
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.hamburger span {
    width: 25px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-base);
}

/* Hero Section */
.hero {
    padding: 120px 0 var(--spacing-4xl);
    background: linear-gradient(135deg, var(--background-primary) 0%, var(--background-secondary) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-image {
    margin-bottom: var(--spacing-2xl);
}

.profile-placeholder {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    box-shadow: 0 20px 40px var(--shadow-medium);
}

.profile-placeholder i {
    font-size: 4rem;
    color: white;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.hero-subtitle {
    font-size: var(--font-size-2xl);
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
    min-height: 2.5rem; /* Prevents layout shift during text transitions */
    line-height: 1.2;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-tagline {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
}

.hero-badges {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-2xl);
}

.badge {
    background: var(--background-secondary);
    color: var(--text-primary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border: 1px solid var(--border-color);
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
}

.cta-primary, .cta-secondary {
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: var(--font-size-base);
    transition: all var(--transition-base);
    min-width: 150px;
    text-align: center;
}

.cta-primary {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 12px rgba(0, 122, 255, 0.3);
}

.cta-primary:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 122, 255, 0.4);
}

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

.cta-secondary:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* About Section */
.about {
    padding: var(--spacing-4xl) 0;
    background: var(--background-primary);
}

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

.about-text p {
    font-size: var(--font-size-lg);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.about-highlights {
    margin-top: var(--spacing-2xl);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.highlight {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--background-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.highlight i {
    color: var(--primary-color);
    font-size: var(--font-size-xl);
}

/* Apps Section */
.apps {
    padding: var(--spacing-4xl) 0;
    background: var(--background-secondary);
}

.apps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-2xl);
}

.app-card {
    background: var(--background-primary);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: 0 8px 32px var(--shadow-medium);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.app-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 16px 48px var(--shadow-strong);
}

.app-mockup {
    padding: var(--spacing-2xl);
    background: linear-gradient(135deg, var(--background-secondary), var(--background-tertiary));
    display: flex;
    justify-content: center;
}

.iphone-frame {
    width: 180px;
    height: 320px;
    background: #000;
    border-radius: 24px;
    padding: 8px;
    position: relative;
}

.app-screenshot {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 18px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
}

.app-screenshot i {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.app-screenshot h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
}


/* Fallback for when image fails to load */
.app-screenshot img[src=""], 
.app-screenshot img:not([src]) {
    display: none;
}

.app-screenshot img[src=""]:after, 
.app-screenshot img:not([src]):after {
    content: '📱';
    font-size: 3rem;
    display: block;
    margin-bottom: var(--spacing-md);
}

/* App Icon Display - Clean Professional Style */
.app-icon-display {
    padding: var(--spacing-2xl);
    background: linear-gradient(135deg, var(--background-secondary), var(--background-tertiary));
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 200px;
    position: relative;
}

.app-icon-image {
    width: 120px !important;
    height: 120px !important;
    border-radius: 27px; /* iOS app icon rounded corners (22.5% of width) */
    object-fit: cover;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.12),
        0 4px 16px rgba(0, 0, 0, 0.08),
        0 1px 4px rgba(0, 0, 0, 0.04);
    transition: all var(--transition-base);
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: var(--background-primary);
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
    max-width: none; /* Override previous max-width */
    max-height: none;
}

.app-icon-image:hover {
    transform: scale(1.05) translateY(-4px);
    box-shadow: 
        0 16px 48px rgba(0, 0, 0, 0.16),
        0 8px 24px rgba(0, 0, 0, 0.12),
        0 2px 8px rgba(0, 0, 0, 0.06);
}

/* Responsive app icon sizes */
@media (max-width: 768px) {
    .app-icon-display {
        padding: var(--spacing-xl);
        min-height: 160px;
    }
    
    .app-icon-image {
        width: 100px;
        height: 100px;
        border-radius: 22.5px; /* Maintain 22.5% ratio */
    }
}

@media (max-width: 480px) {
    .app-icon-display {
        padding: var(--spacing-lg);
        min-height: 140px;
    }
    
    .app-icon-image {
        width: 80px;
        height: 80px;
        border-radius: 18px; /* Maintain 22.5% ratio */
    }
}

/* Image loading optimizations and fallbacks */
.app-icon-image {
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

/* Fallback for broken app icon images */
.app-icon-image[src=""], 
.app-icon-image:not([src]),
.app-icon-image[alt]:after {
    content: "📱";
    font-size: 4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 120px;
    height: 120px;
    background: var(--background-secondary);
    border-radius: 27px;
    color: var(--text-secondary);
}

.app-info {
    padding: var(--spacing-2xl);
}

.app-info h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.app-icon {
    font-size: var(--font-size-xl);
}

.app-concept, .app-journey, .app-impact {
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

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

.skill-tag {
    background: var(--background-secondary);
    color: var(--text-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-xs);
    font-weight: 500;
    border: 1px solid var(--border-color);
}

.app-store-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: #000;
    color: white;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: all var(--transition-base);
}

.app-store-btn:hover {
    background: #333;
    transform: translateY(-2px);
}

/* App Stats and Features */
.app-stats {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.stat-badge {
    background: linear-gradient(135deg, var(--accent-color), #FF6B35);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.app-features {
    background: var(--background-tertiary);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--border-color);
}

.feature-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-xs) 0;
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    line-height: 1.5;
}

.feature-item:not(:last-child) {
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--spacing-xs);
    padding-bottom: var(--spacing-xs);
}

/* Animation Classes */
.fade-in {
    opacity: 0;
    animation: fadeIn 0.8s ease forwards;
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    animation: slideInLeft 0.8s ease forwards;
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    animation: slideInRight 0.8s ease forwards;
}

.fade-in.visible,
.slide-in-left.visible,
.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

@keyframes slideInLeft {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Experience Section */
.experience {
    padding: var(--spacing-4xl) 0;
    background: var(--background-primary);
}

.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: var(--border-color);
}

.timeline-item {
    display: flex;
    margin-bottom: var(--spacing-3xl);
    position: relative;
}

.timeline-item:nth-child(odd) {
    flex-direction: row;
}

.timeline-item:nth-child(even) {
    flex-direction: row-reverse;
}

.timeline-date {
    flex: 0 0 200px;
    text-align: center;
    font-weight: 600;
    color: var(--primary-color);
    font-size: var(--font-size-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.timeline-date::after {
    content: '';
    position: absolute;
    width: 12px;
    height: 12px;
    background: var(--primary-color);
    border-radius: 50%;
    right: -6px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 2;
}

.timeline-content {
    flex: 1;
    background: var(--background-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    margin: 0 var(--spacing-xl);
    box-shadow: 0 4px 16px var(--shadow-light);
}

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

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

.timeline-content ul {
    list-style: none;
    margin-bottom: var(--spacing-lg);
}

.timeline-content li {
    position: relative;
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

.timeline-content li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.tech-used {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tech-used span {
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

/* Company Logo Styles */
.company-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.company-logo {
    flex: 0 0 50px;
    width: 50px;
    height: 50px;
    background: white;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xs);
    box-shadow: 0 2px 8px var(--shadow-light);
    border: 1px solid var(--border-color);
}

.company-logo-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.company-info {
    flex: 1;
}

.company-info h3 {
    margin-bottom: var(--spacing-xs);
}

.company-info h4 {
    margin-bottom: 0;
}

/* University Logo Styles */
.university-logo {
    width: 60px;
    height: 60px;
    object-fit: contain;
    background: white;
    border-radius: var(--border-radius);
    padding: var(--spacing-xs);
    box-shadow: 0 2px 8px var(--shadow-light);
    border: 1px solid var(--border-color);
}

/* Mobile Responsiveness for Logos */
@media (max-width: 768px) {
    .company-header {
        gap: var(--spacing-sm);
    }
    
    .company-logo {
        flex: 0 0 40px;
        width: 40px;
        height: 40px;
    }
    
    .university-logo {
        width: 50px;
        height: 50px;
    }
    
    .timeline-content {
        margin: 0 var(--spacing-sm);
        padding: var(--spacing-lg);
    }
}

/* Skills Section */
.skills {
    padding: var(--spacing-4xl) 0;
    background: var(--background-secondary);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-2xl);
}

.skill-category {
    background: var(--background-primary);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 4px 16px var(--shadow-light);
}

.skill-category h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.skill-category i {
    color: var(--primary-color);
}


.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

/* Education Section */
.education {
    padding: var(--spacing-4xl) 0;
    background: var(--background-primary);
}

.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-2xl);
}

.education-card {
    background: var(--background-secondary);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 4px 16px var(--shadow-light);
    display: flex;
    gap: var(--spacing-lg);
}

.education-icon {
    flex: 0 0 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--font-size-xl);
}

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

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

.education-location, .education-period {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-xs);
}

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

.education-highlight {
    margin: var(--spacing-md) 0;
}

.highlight-badge {
    background: var(--accent-color);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    font-weight: 600;
    display: inline-block;
    margin-bottom: var(--spacing-sm);
}

.education-achievements {
    margin-top: var(--spacing-md);
}

.achievement {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

.achievement i {
    color: var(--accent-color);
}

/* Awards Section */
.awards {
    padding: var(--spacing-4xl) 0;
    background: var(--background-secondary);
}

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

.award-item {
    background: var(--background-primary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    text-align: center;
    box-shadow: 0 4px 16px var(--shadow-light);
    transition: transform var(--transition-base);
}

.award-item:hover {
    transform: translateY(-4px);
}

.award-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--accent-color), var(--success-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    color: white;
    font-size: var(--font-size-xl);
}

.award-item h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.award-item p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

/* Contact Section */
.contact {
    padding: var(--spacing-4xl) 0;
    background: var(--background-primary);
}

.contact-content {
    max-width: 800px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.contact-item i {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--font-size-lg);
}

.contact-item h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.contact-item p {
    color: var(--text-secondary);
    margin: 0;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--background-secondary);
    border-radius: var(--border-radius);
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
}

.contact-link:hover {
    background: var(--primary-color);
    color: white;
    transform: translateX(8px);
}

.contact-link i {
    font-size: var(--font-size-lg);
    width: 24px;
    text-align: center;
}

/* Footer */
.footer {
    padding: var(--spacing-2xl) 0;
    background: var(--background-secondary);
    text-align: center;
    border-top: 1px solid var(--border-color);
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .nav-menu {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .apps-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item {
        flex-direction: column;
        padding-left: 40px;
    }
    
    .timeline-item:nth-child(even) {
        flex-direction: column;
    }
    
    .timeline-date {
        text-align: left;
        margin-bottom: var(--spacing-md);
    }
    
    .timeline-date::after {
        left: -26px;
        top: 50%;
        transform: translateY(-50%);
    }
    
    .timeline-content {
        margin: 0;
    }
    
    .skills-grid, .education-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .education-card {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-badges {
        flex-direction: column;
        align-items: center;
    }
    
    .about-highlights {
        grid-template-columns: 1fr;
    }
    
    .awards-grid {
        grid-template-columns: 1fr;
    }
}

/* Animation Classes */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: all 0.6s ease-out;
}

.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: all 0.6s ease-out;
}

.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* Loading Animation */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.pulse {
    animation: pulse 2s infinite;
}

/* Smooth scrolling for older browsers */
@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

/* App Store Integration Styles */
.stat-badge.rating {
    background: linear-gradient(135deg, #FFD700, #FFA500) !important;
    color: #000 !important;
    font-weight: 600;
}

.app-reviews {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-lg);
    background: var(--background-tertiary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.review-highlight {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.review-highlight i {
    color: var(--primary-color);
    font-size: var(--font-size-lg);
    margin-top: 2px;
    flex-shrink: 0;
}

.review-highlight p {
    font-style: italic;
    color: var(--text-primary);
    font-size: var(--font-size-base);
    line-height: 1.5;
    margin: 0;
}

.review-highlight small {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-top: var(--spacing-xs);
    display: block;
}

/* Business Impact KPI Styles */
.business-impact {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, var(--background-tertiary), var(--background-secondary));
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 16px var(--shadow-light);
}

.kpi-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-lg);
    justify-items: center;
}

.kpi-item {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.kpi-value {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
    display: block;
}

.kpi-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    line-height: 1.2;
}

/* Responsive adjustments for KPIs */
@media (max-width: 768px) {
    .business-impact {
        padding: var(--spacing-lg);
    }
    
    .kpi-row {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
        gap: var(--spacing-md);
    }
    
    .kpi-value {
        font-size: var(--font-size-2xl);
    }
    
    .kpi-label {
        font-size: var(--font-size-xs);
    }
}

@media (max-width: 480px) {
    .kpi-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .kpi-item {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
        width: 100%;
        padding: var(--spacing-sm) 0;
        border-bottom: 1px solid var(--border-color);
    }
    
    .kpi-item:last-child {
        border-bottom: none;
    }
    
    .kpi-value {
        font-size: var(--font-size-xl);
    }
}