/* ===================================
   MODERN PORTFOLIO CSS - REDESIGNED
   =================================== */

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

/* CSS Variables */
:root {
    /* Colors */
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #06b6d4;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-glass: rgba(255, 255, 255, 0.25);
    
    /* Text Colors */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #64748b;
    --text-inverse: #ffffff;
    
    /* Border & Shadow */
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;
    --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-size-6xl: 3.75rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal: 1040;
    --z-popover: 1050;
    --z-tooltip: 1060;
}

/* Dark Theme Variables */
.dark-theme {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-glass: rgba(15, 23, 42, 0.25);
    
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --text-inverse: #0f172a;
    
    --border-color: #334155;
    --border-light: #475569;
}

/* Base Styles */
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(--bg-primary);
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

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

@media (min-width: 640px) {
    .container {
        padding: 0 var(--spacing-xl);
    }
}

/* ===================================
   NAVIGATION
   =================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    transition: all var(--transition-normal);
}

.dark-theme .navbar {
    background: rgba(15, 23, 42, 0.8);
    border-bottom-color: var(--border-color);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-md);
}

.dark-theme .navbar.scrolled {
    background: rgba(15, 23, 42, 0.95);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
    max-width: 1200px;
    margin: 0 auto;
    padding-left: var(--spacing-lg);
    padding-right: var(--spacing-lg);
}

@media (min-width: 640px) {
    .nav-container {
        padding-left: var(--spacing-xl);
        padding-right: var(--spacing-xl);
    }
}

/* Logo */
.nav-logo {
    display: flex;
    align-items: center;
}

.logo-link {
    text-decoration: none;
    font-size: var(--font-size-2xl);
    font-weight: 800;
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

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

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

.logo-link:hover .logo-text {
    color: var(--primary-color);
}

/* Navigation Menu */
.nav-menu {
    display: flex;
    list-style: none;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-item {
    position: relative;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: var(--font-size-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    border-radius: var(--radius-full);
    transform: translateX(-50%);
    transition: width var(--transition-fast);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 20px;
}

/* Navigation Actions */
.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.theme-toggle {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
}

.theme-toggle:hover {
    background: var(--primary-color);
    color: var(--text-inverse);
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: var(--spacing-sm);
    gap: 4px;
}

.hamburger span {
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        border-top: 1px solid var(--border-color);
        flex-direction: column;
        padding: var(--spacing-xl);
        gap: var(--spacing-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
        box-shadow: var(--shadow-xl);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-link {
        font-size: var(--font-size-lg);
        padding: var(--spacing-md);
        text-align: center;
        width: 100%;
    }
    
    .hamburger {
        display: flex;
    }
}

/* ===================================
   HERO SECTION
   =================================== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    overflow: hidden;
}

.hero-container {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    text-align: center;
}

@media (min-width: 640px) {
    .hero-container {
        padding: 0 var(--spacing-xl);
    }
}

/* Hero Background */
.hero-background {
    position: absolute;
    inset: 0;
    z-index: 1;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(40px);
    opacity: 0.6;
    animation: float 8s ease-in-out infinite;
}

.gradient-orb-1 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    top: -200px;
    right: -200px;
    animation-delay: 0s;
}

.gradient-orb-2 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
    bottom: -150px;
    left: -150px;
    animation-delay: 2s;
}

.gradient-orb-3 {
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 4s;
}

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

/* Hero Content */
.hero-content {
    position: relative;
    z-index: 3;
    max-width: 800px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-full);
    padding: var(--spacing-sm) var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

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

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

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

.title-greeting {
    display: block;
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.title-name {
    display: block;
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-md);
}

.title-profession {
    display: block;
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 600;
    color: var(--text-primary);
    min-height: 60px;
}


.hero-description {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
}

/* Hero Actions */
.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    justify-content: center;
    margin-bottom: var(--spacing-2xl);
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: var(--font-size-sm);
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--text-inverse);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--secondary-color);
    color: var(--text-inverse);
    box-shadow: var(--shadow-md);
}

.btn-secondary:hover {
    background: #0891b2;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-outline:hover {
    background: var(--primary-color);
    color: var(--text-inverse);
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
    justify-content: center;
}

/* Hero Social */
.hero-social {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-normal);
    font-size: var(--font-size-lg);
}

.social-link:hover {
    background: var(--primary-color);
    color: var(--text-inverse);
    transform: translateY(-4px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

/* Social Link Images (for LeetCode, Codeforces, etc.) */
.social-link-image {
    padding: 8px;
}

.social-icon-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: all var(--transition-normal);
    filter: none;
    opacity: 0.8;
}

.social-link-image:hover .social-icon-img {
    opacity: 1;
}

/* Dark mode - only invert LeetCode logo (black logo) */
.dark-theme .social-icon-img[src*="LeetCode"] {
    filter: brightness(0) invert(1);
    opacity: 0.9;
}

.dark-theme .social-link-image:hover .social-icon-img[src*="LeetCode"] {
    filter: brightness(0) invert(1);
    opacity: 1;
}

/* Dark mode - Codeforces logo keeps original colors */
.dark-theme .social-icon-img[src*="codeforces"] {
    filter: none;
    opacity: 0.9;
}

.dark-theme .social-link-image:hover .social-icon-img[src*="codeforces"] {
    filter: none;
    opacity: 1;
}


/* ===================================
   SECTION HEADERS
   =================================== */

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.section-label {
    display: inline-block;
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-full);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.2;
}

.section-description {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===================================
   ABOUT SECTION
   =================================== */

.about {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

@media (min-width: 1024px) {
    .about-content {
        grid-template-columns: 1fr 1fr;
    }
}

.about-text {
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-light);
}

.about-intro p {
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
    line-height: 1.7;
}

.about-intro p:last-child {
    margin-bottom: 0;
}

/* Info Tabs */
.about-info {
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-light);
}

.info-tabs {
    display: flex;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xs);
    margin-bottom: var(--spacing-xl);
    gap: var(--spacing-xs);
}

.tab-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tab-btn.active {
    background: var(--bg-primary);
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.tab-btn:hover:not(.active) {
    color: var(--text-primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Skills Grid */
.skills-grid {
    display: grid;
    gap: var(--spacing-xl);
}

.skill-category h4 {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-lg);
}

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

.skill-tag {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border: 1px solid var(--border-light);
    transition: all var(--transition-fast);
}

.skill-tag:hover {
    background: var(--primary-color);
    color: var(--text-inverse);
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

/* Timeline */
.timeline {
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-color);
}

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

.timeline-item::before {
    content: '';
    position: absolute;
    left: -5px;
    top: 8px;
    width: 12px;
    height: 12px;
    background: var(--primary-color);
    border-radius: 50%;
    border: 3px solid var(--bg-primary);
}

.timeline-date {
    font-size: var(--font-size-sm);
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.timeline-content h4 {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.company {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
    display: block;
}

.timeline-content ul {
    list-style: none;
    padding: 0;
}

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

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

/* Experience Header with Company Logos */
.experience-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
    gap: var(--spacing-lg);
}

.experience-text {
    flex: 1;
}

.experience-text h4 {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-lg);
}

.experience-text .company {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: 0;
    display: block;
}

.company-logo {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
    overflow: hidden;
}

.timeline-logo {
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
    transition: transform var(--transition-fast);
    padding: 8px;
}

.company-logo:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.company-logo:hover .timeline-logo {
    transform: scale(1.05);
}

/* Dark theme adjustments for company logos */
.dark-theme .company-logo {
    background: var(--bg-secondary);
    border-color: var(--border-color);
}

.dark-theme .company-logo:hover {
    border-color: var(--primary-color);
}

/* Company Links Styling */
.company-link {
    text-decoration: none;
    transition: all var(--transition-fast);
}

.company-link .company {
    transition: all var(--transition-fast);
}

.company-link:hover .company {
    color: var(--primary-color);
    transform: translateX(2px);
}

.company-logo-link {
    text-decoration: none;
    transition: all var(--transition-fast);
    border-radius: var(--radius-lg);
}

.company-logo-link:hover {
    transform: translateY(-4px);
}

.company-logo-link:hover .company-logo {
    transform: translateY(0);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.company-logo-link:hover .timeline-logo {
    transform: scale(1.1);
}

/* Active and Focus states for accessibility */
.company-link:focus,
.company-logo-link:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

.company-link:active .company {
    color: var(--primary-dark);
}

/* Mobile responsiveness for experience header */
@media (max-width: 768px) {
    .experience-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .company-logo {
        width: 50px;
        height: 50px;
        align-self: flex-end;
    }
    
    .timeline-logo {
        padding: 6px;
    }
    
    .company-logo-link:hover {
        transform: translateY(-2px);
    }
}

@media (max-width: 480px) {
    .experience-header {
        gap: var(--spacing-sm);
    }
    
    .company-logo {
        width: 45px;
        height: 45px;
    }
    
    .timeline-logo {
        padding: 5px;
    }
    
    .company-link:hover .company {
        transform: translateX(1px);
    }
}

/* Education */
.education-item {
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
}

.education-period {
    font-size: var(--font-size-sm);
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.education-content h4 {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.institution {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-sm);
    display: block;
}

.gpa {
    color: var(--primary-color);
    font-weight: 600;
    font-size: var(--font-size-sm);
}

/* ===================================
   SERVICES SECTION
   =================================== */

.services {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-primary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-2xl);
}

.service-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-2xl);
    text-align: center;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.service-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: 1;
}

.service-card:hover::before {
    opacity: 0.03;
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-2xl);
    border-color: var(--primary-color);
}

.service-card > * {
    position: relative;
    z-index: 2;
}

.service-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-xl);
    color: var(--text-inverse);
    font-size: var(--font-size-3xl);
    box-shadow: var(--shadow-lg);
}

.service-card h3 {
    color: var(--text-primary);
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
}

.service-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-xl);
}

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

.service-tags span {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 500;
    border: 1px solid var(--border-light);
}

.service-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-fast);
}

.service-link:hover {
    color: var(--primary-dark);
    transform: translateX(4px);
}

/* ===================================
   PORTFOLIO SECTION
   =================================== */

.portfolio {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-secondary);
}

.portfolio-filter {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-3xl);
    flex-wrap: wrap;
}

.filter-btn {
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-full);
    padding: var(--spacing-sm) var(--spacing-lg);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-btn.active,
.filter-btn:hover {
    background: var(--primary-color);
    color: var(--text-inverse);
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-3xl);
}

.project-card {
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-light);
    transition: all var(--transition-normal);
    group: hover;
}

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

@media (max-width: 768px) {
    .project-card.featured {
        grid-column: span 1;
    }
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-2xl);
    border-color: var(--primary-color);
}

.project-image {
    position: relative;
    overflow: hidden;
    height: 240px;
}

.project-card.featured .project-image {
    height: 300px;
}

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

.project-card:hover .project-image img {
    transform: scale(1.05);
}

/* Image Carousel */
.project-carousel {
    position: relative;
    width: 100%;
    height: 100%;
}

.carousel-images {
    position: relative;
    width: 100%;
    height: 100%;
}

.carousel-images img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.carousel-images img.active {
    opacity: 1;
    position: relative;
}

/* Carousel Navigation Arrows */
.carousel-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    border: none;
    color: white;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all var(--transition-fast);
    z-index: 15;
    font-size: 16px;
}

.project-card:hover .carousel-nav {
    opacity: 1;
}

.carousel-nav:hover {
    background: rgba(99, 102, 241, 0.9);
    transform: translateY(-50%) scale(1.1);
}

.carousel-prev {
    left: var(--spacing-md);
}

.carousel-next {
    right: var(--spacing-md);
}

/* Carousel Indicators */
.carousel-indicators {
    position: absolute;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--spacing-sm);
    z-index: 15;
}

.carousel-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    padding: 0;
}

.carousel-indicator.active {
    background: var(--primary-color);
    width: 24px;
    border-radius: var(--radius-full);
}

.carousel-indicator:hover {
    background: rgba(255, 255, 255, 0.8);
}

/* Hide carousel controls if only one image */
.project-carousel[data-images="1"] .carousel-nav,
.project-carousel[data-images="1"] .carousel-indicators {
    display: none;
}

.project-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: all var(--transition-normal);
    z-index: 10;
}

.project-card:hover .project-overlay {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.project-links {
    display: flex;
    gap: var(--spacing-md);
}

.project-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    text-decoration: none;
    transition: all var(--transition-fast);
    font-size: var(--font-size-lg);
}

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

.project-link.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.project-content {
    padding: var(--spacing-xl);
}

.project-category {
    color: var(--primary-color);
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-sm);
}

.project-content h3 {
    color: var(--text-primary);
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.project-content p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.project-tech span {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 500;
    border: 1px solid var(--border-light);
}

.portfolio-cta {
    text-align: center;
}

/* ===================================
   CONTACT SECTION
   =================================== */

.contact {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-primary);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

@media (min-width: 1024px) {
    .contact-content {
        grid-template-columns: 1fr 1fr;
    }
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xl);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-lg);
}

.contact-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-xl);
    color: var(--text-inverse);
    font-size: var(--font-size-xl);
    flex-shrink: 0;
    box-shadow: var(--shadow-lg);
}

.contact-details h4 {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-lg);
}

.contact-details p {
    color: var(--text-secondary);
    font-size: var(--font-size-base);
}

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

.contact-social h4 {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-lg);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

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

/* Contact Form */
.contact-form {
    background: var(--bg-secondary);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-2xl);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-lg);
}

.form-group {
    position: relative;
    margin-bottom: var(--spacing-lg);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-lg) 3.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: var(--font-size-base);
    transition: all var(--transition-fast);
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group i {
    position: absolute;
    left: var(--spacing-lg);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
    font-size: var(--font-size-lg);
    transition: color var(--transition-fast);
}

.form-group textarea + i {
    top: 1.5rem;
    transform: none;
}

.form-group input:focus + i,
.form-group textarea:focus + i {
    color: var(--primary-color);
}

#form-message {
    margin-top: var(--spacing-lg);
    text-align: center;
}

.success-message {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid var(--success-color);
    color: var(--success-color);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    font-weight: 500;
}

.error-message {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error-color);
    color: var(--error-color);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    font-weight: 500;
}

/* ===================================
   FOOTER
   =================================== */

.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-light);
    padding: var(--spacing-2xl) 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.footer-text {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

/* ===================================
   BACK TO TOP BUTTON
   =================================== */

.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 56px;
    height: 56px;
    background: var(--primary-color);
    border: none;
    border-radius: var(--radius-xl);
    color: var(--text-inverse);
    font-size: var(--font-size-lg);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    z-index: var(--z-fixed);
    box-shadow: var(--shadow-lg);
}

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

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

/* ===================================
   ANIMATIONS
   =================================== */

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

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

/* ===================================
   RESPONSIVE DESIGN
   =================================== */

/* Mobile First Approach */
@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
        width: 100%;
    }
    
    .hero-actions .btn {
        width: 100%;
        max-width: 280px;
    }
    
    .portfolio-filter {
        gap: var(--spacing-sm);
    }
    
    .filter-btn {
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: var(--font-size-xs);
    }
    
    .portfolio-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .services-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .service-card {
        padding: var(--spacing-xl);
    }
    
    .contact-content {
        gap: var(--spacing-2xl);
    }
    
    .contact-form {
        padding: var(--spacing-xl);
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .back-to-top {
        bottom: var(--spacing-lg);
        right: var(--spacing-lg);
        width: 48px;
        height: 48px;
    }
}

/* Tablet Styles */
@media (min-width: 481px) and (max-width: 768px) {
    .portfolio-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
    
    .services-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

/* Desktop Styles */
@media (min-width: 1024px) {
    .portfolio-grid {
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    }
}

/* Large Desktop Styles */
@media (min-width: 1440px) {
    .container {
        max-width: 1400px;
    }
    
    .hero-container {
        max-width: 1400px;
    }
    
    .nav-container {
        max-width: 1400px;
    }
}

/* High DPI Displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .service-icon,
    .contact-icon {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

/* Reduced Motion */
@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;
    }
    
    .gradient-orb {
        animation: none;
    }
    
    .scroll-arrow {
        animation: none;
    }
    
    .status-indicator {
        animation: none;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .hero-social,
    .scroll-indicator,
    .back-to-top,
    .contact-form {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
    
    .hero {
        min-height: auto;
        padding: 2rem 0;
    }
    
    .section-header,
    .about-content,
    .services-grid,
    .portfolio-grid,
    .contact-content {
        break-inside: avoid;
        page-break-inside: avoid;
    }
}

/* Focus Styles for Accessibility */
.btn:focus,
.nav-link:focus,
.theme-toggle:focus,
.filter-btn:focus,
.tab-btn:focus,
.social-link:focus,
.project-link:focus,
.back-to-top:focus,
input:focus,
textarea:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}