/* Responsive Design - Mobile First Approach */

/* Extra Small Devices (phones, 576px and down) */
@media (max-width: 575.98px) {
    html {
        scroll-padding-top: 80px;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
        max-width: 100%;
        overflow-x: hidden;
    }
    
    /* Ensure navigation elements don't overflow on very small screens */
    .nav-container {
        padding: var(--spacing-sm);
        gap: var(--spacing-xs);
    }
    
    .nav-social {
        gap: 0.25rem;
    }
    
    .social-link {
        padding: var(--spacing-xs);
        font-size: var(--font-size-base);
    }
    
    /* Mobile back-to-top button positioning */
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: var(--font-size-base);
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
        text-align: center;
        padding-top: var(--spacing-lg);
        min-height: calc(80vh - 4rem);
        justify-content: center;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
        line-height: 1.1;
        animation: fadeInUp 0.8s ease-out;
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
        animation: fadeInUp 0.8s ease-out 0.2s both;
    }
    
    .hero-description {
        font-size: var(--font-size-base);
        animation: fadeInUp 0.8s ease-out 0.4s both;
    }
    
    .hero-actions {
        justify-content: center;
        animation: fadeInUp 0.8s ease-out 0.6s both;
    }
    
    .hero-avatar {
        width: 200px;
        height: 200px;
        animation: fadeInUp 0.8s ease-out 0.1s both, float 6s ease-in-out infinite 1s;
    }
    
    /* Mobile navigation menu fixes */
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--nav-bg);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding-top: var(--spacing-2xl);
        transition: left var(--transition-normal);
        backdrop-filter: blur(10px);
        -webkit-overflow-scrolling: touch;
        overscroll-behavior: contain;
        z-index: 1002; /* Ensure proper stacking above navbar */
    }
    
    .nav-container {
        justify-content: space-between;
        align-items: center;
    }
    
    .nav-social {
        order: 2;
    }
    
    .theme-toggle {
        position: static;
        transform: none;
        order: 3;
        margin-left: auto;
    }
    
    .nav-toggle {
        display: flex;
        order: 1;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .tech-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
    
    .tech-item {
        padding: var(--spacing-lg);
    }
    
    .tech-item i {
        font-size: 2rem;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .research-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .education-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .certifications-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .timeline {
        margin-top: var(--spacing-xl);
    }
    
    .timeline-item {
        padding-left: 40px;
        margin-bottom: var(--spacing-xl);
    }
    
    .timeline-marker {
        left: 6px;
        width: 16px;
        height: 16px;
    }
    
    .timeline-content {
        padding: var(--spacing-lg);
    }
    
    /* .support-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .support-btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    } */
    
    .section {
        padding: var(--spacing-2xl) 0;
        will-change: transform;
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
        margin-bottom: var(--spacing-2xl);
        animation: fadeInUp 0.6s ease-out;
    }
    
    /* Additional mobile navigation fixes */
    .nav-menu .nav-link {
        padding: var(--spacing-md) var(--spacing-lg);
        width: 100%;
        text-align: center;
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-menu .nav-link:last-child {
        border-bottom: none;
    }
    
    /* Fix potential overflow issues */
    .hero-actions .btn {
        width: 100%;
        max-width: 200px;
        justify-content: center;
    }
    
    /* .support-buttons .support-btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    } */
}

/* Very Small Devices (under 400px) */
@media (max-width: 399.98px) {
    .container {
        padding: 0 var(--spacing-xs);
    }
    
    .hero-content {
        min-height: calc(80vh - 3rem);
        padding-top: var(--spacing-md);
    }
    
    .hero-title {
        font-size: var(--font-size-2xl);
        animation: fadeInUp 0.6s ease-out;
    }
    
    .hero-subtitle {
        font-size: var(--font-size-base);
        animation: fadeInUp 0.6s ease-out 0.1s both;
    }
    
    .hero-description {
        font-size: var(--font-size-sm);
        animation: fadeInUp 0.6s ease-out 0.2s both;
    }
    
    .hero-avatar {
        width: 150px;
        height: 150px;
        animation: fadeInUp 0.6s ease-out 0.05s both, float 6s ease-in-out infinite 0.8s;
    }
    
    .section {
        padding: var(--spacing-xl) 0;
        will-change: transform;
    }
    
    .project-card,
    .research-card,
    .education-card,
    .certification-card {
        padding: var(--spacing-lg);
        will-change: transform;
    }
    
    /* Very small screen navigation optimizations */
    .nav-menu {
        top: 55px; /* Further reduced for very small screens */
        height: calc(100vh - 55px);
    }
    
    .nav-container {
        padding: var(--spacing-xs);
        gap: var(--spacing-xs);
        min-height: 55px; /* Match the mobile menu top position */
    }
    
    .navbar {
        min-height: 55px; /* Ensure navbar height matches mobile menu */
    }
    
    .nav-toggle {
        min-width: 40px;
        min-height: 40px;
    }
    
    .nav-social {
        gap: 0.25rem;
    }
    
    .social-link {
        padding: var(--spacing-xs);
        font-size: var(--font-size-sm);
    }
    
    .theme-toggle {
        min-width: 40px;
        min-height: 40px;
        font-size: var(--font-size-base);
    }
    
    .back-to-top {
        bottom: 15px;
        right: 15px;
        width: 40px;
        height: 40px;
        font-size: var(--font-size-sm);
    }
}

/* Small Devices (landscape phones, 576px and up) */
@media (min-width: 576px) and (max-width: 767.98px) {
    html {
        scroll-padding-top: 80px;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
        text-align: center;
        min-height: calc(80vh - 4rem);
        justify-content: center;
    }
    
    .hero-visual {
        order: -1;
        animation: fadeInUp 0.8s ease-out 0.1s both;
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
        animation: fadeInUp 0.8s ease-out;
    }
    
    .hero-subtitle {
        animation: fadeInUp 0.8s ease-out 0.2s both;
    }
    
    .hero-description {
        animation: fadeInUp 0.8s ease-out 0.4s both;
    }
    
    .hero-actions {
        animation: fadeInUp 0.8s ease-out 0.6s both;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .tech-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .research-grid {
        grid-template-columns: 1fr;
    }
    
    .education-grid {
        grid-template-columns: 1fr;
    }
    
    .certifications-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--nav-bg);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding-top: var(--spacing-2xl);
        transition: left var(--transition-normal);
        backdrop-filter: blur(10px);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .nav-container {
        justify-content: space-between;
    }
    
    .nav-social {
        order: 2;
    }
    
    .nav-toggle {
        display: flex;
        order: 1;
    }
}

/* Medium Devices (tablets, 768px and up) */
@media (min-width: 768px) and (max-width: 991.98px) {
    html {
        scroll-padding-top: 80px;
    }
    
    .hero-content {
        grid-template-columns: auto 1fr;
        gap: 4rem;
        text-align: left;
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .tech-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .research-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .education-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .certifications-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .nav-menu {
        display: flex;
        margin-right: auto;
        gap: var(--spacing-sm);
        flex-wrap: nowrap;
        justify-content: flex-start;
    }
    
    .nav-menu.overflow-hidden {
        display: none;
    }
    
    .nav-link {
        font-size: var(--font-size-sm);
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .nav-toggle {
        display: none;
    }
    
    .nav-toggle.overflow-visible {
        display: flex;
    }
    
    .nav-container {
        justify-content: space-between;
        padding: var(--spacing-sm) var(--spacing-md);
        flex-wrap: nowrap;
        gap: var(--spacing-sm);
        align-items: center;
    }
    
    .nav-separator {
        display: none;
    }
    
    .theme-toggle {
        position: static;
        transform: none;
        margin-left: var(--spacing-sm);
        align-self: center;
        order: 3;
    }
    
    .nav-social {
        gap: 0.5rem;
        margin-right: var(--spacing-2xl);
        order: 2;
    }
    
    .nav-toggle {
        order: 1;
    }
    
    .social-link {
        font-size: var(--font-size-base);
        padding: var(--spacing-xs);
    }
}

/* Large Devices (desktops, 992px and up) */
@media (min-width: 992px) and (max-width: 1199.98px) {
    .hero-content {
        grid-template-columns: auto 1fr;
        gap: 5rem;
        text-align: left;
    }
    
    .about-content {
        grid-template-columns: 2fr 1fr;
        gap: var(--spacing-3xl);
    }
    
    .tech-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .research-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .education-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .certifications-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .nav-menu {
        display: flex;
        margin-right: auto;
        gap: var(--spacing-lg);
        flex-wrap: nowrap;
        justify-content: flex-start;
    }
    
    .nav-menu.overflow-hidden {
        display: none;
    }
    
    .nav-link {
        font-size: var(--font-size-base);
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .nav-toggle {
        display: none;
    }
    
    .nav-toggle.overflow-visible {
        display: flex;
    }
    
    .nav-container {
        justify-content: space-between;
        padding: var(--spacing-md) var(--spacing-lg);
        flex-wrap: nowrap;
        gap: var(--spacing-sm);
    }
    
    .theme-toggle {
        position: static;
        transform: none;
    }
    
    .nav-social {
        gap: 0.5rem;
        margin-right: var(--spacing-2xl);
    }
    
    .social-link {
        font-size: var(--font-size-lg);
        padding: var(--spacing-sm);
    }
}

/* Extra Large Devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {
    .hero-content {
        grid-template-columns: auto 1fr;
        gap: 5rem;
        text-align: left;
    }
    
    .about-content {
        grid-template-columns: 2fr 1fr;
        gap: var(--spacing-3xl);
    }
    
    .tech-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .research-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .education-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .certifications-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .nav-menu {
        display: flex;
        margin-right: auto;
        gap: var(--spacing-xl);
        flex-wrap: nowrap;
        justify-content: flex-start;
    }
    
    .nav-menu.overflow-hidden {
        display: none;
    }
    
    .nav-link {
        font-size: var(--font-size-base);
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .nav-toggle {
        display: none;
    }
    
    .nav-toggle.overflow-visible {
        display: flex;
    }
    
    .nav-container {
        justify-content: space-between;
        padding: var(--spacing-md) var(--spacing-lg);
        flex-wrap: nowrap;
        gap: var(--spacing-sm);
    }
    
    .nav-social {
        gap: 0.5rem;
        margin-right: var(--spacing-2xl);
    }
    
    .social-link {
        font-size: var(--font-size-lg);
        padding: var(--spacing-sm);
    }
}

/* Ultra Wide Screens (1400px and up) */
@media (min-width: 1400px) {
    .container {
        max-width: 1320px;
    }
    
    .hero-content {
        gap: var(--spacing-3xl);
    }
    
    .about-content {
        gap: var(--spacing-3xl);
    }
    
    .theme-toggle {
        position: absolute;
        right: var(--spacing-lg);
        top: 50%;
        transform: translateY(-50%);
    }
}

/* Ultra-wide monitors (≥1440px) */
@media (min-width: 1440px) {
    .container {
        max-width: 1280px;
        margin: 0 auto;
    }
    
    .hero-content {
        max-width: 1280px;
        margin: 0 auto;
    }
    
    .hero-description {
        font-size: 1.125rem;
        line-height: 1.75;
        color: #b0b8d1;
    }
    
    .theme-toggle {
        position: absolute;
        right: var(--spacing-lg);
        top: 50%;
        transform: translateY(-50%);
    }
    
    .nav-menu {
        gap: var(--spacing-xl);
        max-width: 800px;
    }
    
    .nav-container {
        max-width: 1400px;
    }
    
    .nav-social {
        gap: 0.5rem;
        margin-right: var(--spacing-2xl);
    }
    
    .social-link {
        font-size: var(--font-size-lg);
        padding: var(--spacing-sm);
    }
}

/* Landscape Orientation Adjustments */
@media (orientation: landscape) and (max-height: 600px) {
    .hero {
        min-height: 100vh;
        padding: var(--spacing-2xl) 0;
    }
    
    .hero-content {
        gap: var(--spacing-xl);
    }
    
    .hero-avatar {
        width: 150px;
        height: 150px;
    }
    
    .section {
        padding: var(--spacing-2xl) 0;
    }
    
    .nav-menu {
        gap: var(--spacing-sm);
    }
    
    .nav-link {
        font-size: var(--font-size-sm);
        padding: var(--spacing-xs);
    }
    
    .nav-container {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .nav-social {
        gap: 0.25rem;
        margin-right: var(--spacing-sm);
    }
    
    .social-link {
        font-size: var(--font-size-base);
        padding: var(--spacing-xs);
    }
    
    .theme-toggle {
        margin-left: var(--spacing-sm);
    }
    
    /* Landscape mobile menu optimizations */
    .nav-menu {
        top: 60px; /* Reduced for landscape */
        height: calc(100vh - 60px);
        padding-top: var(--spacing-lg);
    }
    
    .nav-menu .nav-link {
        font-size: var(--font-size-sm);
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .back-to-top {
        bottom: 15px;
        right: 15px;
        width: 40px;
        height: 40px;
        font-size: var(--font-size-sm);
    }
}

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

/* Narrow screen navigation overflow prevention */
/* Remove conflicting media query that was causing theme toggle overlap */

/* Reduced Motion Preferences */
@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;
    }
    
    .hero-avatar {
        animation: none;
    }
    
    .btn::before,
    .support-btn::before {
        display: none;
    }
    
    /* Disable scroll animations for accessibility */
    .hero-title,
    .hero-subtitle,
    .hero-description,
    .hero-actions,
    .section-title {
        animation: none !important;
    }
}

/* Dark Mode System Preference */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #0a0a0a;
        --bg-secondary: #1a1a1a;
        --bg-tertiary: #2a2a2a;
        --text-primary: #ffffff;
        --text-secondary: #b0b0b0;
        --text-muted: #808080;
        --border-color: #333333;
        --shadow-color: rgba(0, 0, 0, 0.3);
        --card-bg: #1a1a1a;
        --nav-bg: rgba(10, 10, 10, 0.95);
        --nav-border: rgba(255, 255, 255, 0.1);
    }
}

@media (prefers-color-scheme: light) {
    :root {
        --bg-primary: #ffffff;
        --bg-secondary: #f8fafc;
        --bg-tertiary: #f1f5f9;
        --text-primary: #0f172a;
        --text-secondary: #475569;
        --text-muted: #64748b;
        --border-color: #e2e8f0;
        --shadow-color: rgba(0, 0, 0, 0.1);
        --card-bg: #ffffff;
        --nav-bg: rgba(255, 255, 255, 0.95);
        --nav-border: rgba(0, 0, 0, 0.1);
    }
}

/* Print Styles */
@media print {
    .navbar,
    .nav-toggle,
    .theme-toggle,
    .back-to-top,
    /* .support-section {
        display: none !important;
    } */
    
    .hero {
        min-height: auto;
        padding: var(--spacing-2xl) 0;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: left;
    }
    
    .hero-avatar {
        display: none;
    }
    
    .section {
        padding: var(--spacing-xl) 0;
        page-break-inside: avoid;
    }
    
    .project-card,
    .research-card,
    .education-card,
    .certification-card {
        page-break-inside: avoid;
        border: 1px solid #ccc;
        box-shadow: none;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
    
    a {
        color: #0066cc !important;
        text-decoration: underline !important;
    }
    
    .btn {
        border: 1px solid #ccc !important;
        background: white !important;
        color: black !important;
    }
}

/* Focus Styles for Accessibility */
@media (prefers-reduced-motion: no-preference) {
    .nav-link:focus,
    .btn:focus,
    .social-link:focus,
    .theme-toggle:focus,
    .project-link:focus,
    .research-link:focus,
    .timeline-link:focus,
    .education-link:focus,
    .certification-link:focus {
        outline: 2px solid var(--accent-primary);
        outline-offset: 2px;
    }
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
    html {
        scroll-padding-top: 80px;
    }
    
    .nav-link:hover::after,
    .nav-link.active::after {
        width: 0;
    }
    
    .nav-link:active::after {
        width: 100%;
    }
    
    .btn:hover,
    .social-link:hover,
    .project-card:hover,
    .research-card:hover,
    .education-card:hover,
    .certification-card:hover,
    .skill-category:hover,
    .tech-item:hover,
    .timeline-content:hover {
        transform: none;
    }
    
    .btn:active,
    .social-link:active,
    .project-card:active,
    .research-card:active,
    .education-card:active,
    .certification-card:active,
    .skill-category:active,
    .tech-item:active,
    .timeline-content:active {
        transform: scale(0.98);
    }
    
    /* Improved mobile scroll performance */
    .hero-content,
    .section,
    .container {
        will-change: auto;
    }
    
    /* Better touch scrolling with slower behavior */
    .nav-menu {
        -webkit-overflow-scrolling: touch;
        overscroll-behavior: contain;
    }
    
    /* Optimize animations for mobile */
    .hero-avatar {
        animation: fadeInUp 0.6s ease-out 0.1s both, float 4s ease-in-out infinite 1s;
    }
    
    /* Additional mobile scroll optimizations */
    .hero-content,
    .section,
    .project-card,
    .research-card,
    .education-card,
    .certification-card {
        transition: transform 0.3s ease-out;
    }
    
    /* Disable transform animations on project cards for better mobile performance */
    .project-card {
        transform: none !important;
        will-change: auto;
    }
    
    .project-card:hover {
        transform: none !important;
    }
    
    .project-card:active {
        transform: scale(0.98) !important;
    }
    
    /* Slower scroll momentum */
    body {
        -webkit-overflow-scrolling: touch;
    }
    
    /* Prevent scroll issues with project cards */
    .projects-grid {
        transform: translateZ(0);
        backface-visibility: hidden;
    }
    
    .project-card {
        transform: translateZ(0);
        backface-visibility: hidden;
        -webkit-transform: translateZ(0);
        -webkit-backface-visibility: hidden;
    }
}

/* Container Query Support (Future) */
@supports (container-type: inline-size) {
    /* .container { */
        /* container-type: inline-size; */
    /* } */
    
    @container (max-width: 600px) {
        .hero-content {
            grid-template-columns: 1fr;
        }
        
        .about-content {
            grid-template-columns: 1fr;
        }
    }
}