/* Theme Variables - Dark Mode Only */
:root {
    --bg-primary: #0F172A;
    --bg-secondary: #1E293B;
    --bg-tertiary: #334155;
    --text-primary: #F1F5F9;
    --text-secondary: #CBD5E1;
    --text-muted: #94A3B8;
    --accent-primary: #06B6D4;
    --accent-secondary: #0891B2;
    --border-color: #475569;
}

/* Custom styles for the page */
body {
    /* Use Inter for sans-serif and Roboto Mono for monospaced text */
    font-family: 'Inter', sans-serif; 
    scroll-behavior: smooth; /* Smooth scrolling for anchor links */
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.font-mono {
    font-family: 'Roboto Mono', monospace;
}

.font-sans {
     font-family: 'Inter', sans-serif;
}

/* Transition classes for smooth fade effects */
.fade-in {
    animation: fadeIn 1s ease-in-out forwards;
}

.fade-out {
    animation: fadeOut 1s ease-in-out forwards;
}

#homepage {
    display: none; /* Initially hide the homepage */
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
}

#homepage.visible {
    display: block;
    opacity: 1;
}

/* Modal styles */
.modal-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 100;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
}

.modal-content {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    padding: 2rem;
    border-radius: 0.5rem; /* rounded-lg */
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05); /* shadow-xl */
    border: 1px solid var(--border-color);
    max-width: 90%;
    width: 500px;
    position: relative;
    text-align: center;
    max-height: 90vh;
    overflow-y: auto;
}

/* Enhanced modal close button */
.modal-content .close-button,
#close-tech-modal-btn,
#close-modal-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s ease;
    z-index: 101;
    /* Ensure it's clickable on mobile */
    min-height: 44px;
    min-width: 44px;
    touch-action: manipulation;
}

.modal-content .close-button:hover,
#close-tech-modal-btn:hover,
#close-modal-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.modal-content .close-button:active,
#close-tech-modal-btn:active,
#close-modal-btn:active {
    transform: scale(0.95);
    background-color: var(--accent-primary);
    color: var(--bg-primary);
}

/* Tech card hover effects */
.tech-card {
    transition: all 0.3s ease;
}

.tech-card:hover {
    transform: translateY(-8px) scale(1.05);
    box-shadow: 0 10px 25px rgba(6, 182, 212, 0.3);
    border: 2px solid rgba(6, 182, 212, 0.5);
}

.tech-card:active {
    transform: translateY(-4px) scale(1.02);
}

/* Tech modal animations */
.modal-overlay.show {
    animation: modalFadeIn 0.3s ease-out;
}

.modal-overlay.hide {
    animation: modalFadeOut 0.3s ease-out;
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
        backdrop-filter: blur(0px);
    }
    to {
        opacity: 1;
        backdrop-filter: blur(4px);
    }
}

@keyframes modalFadeOut {
    from {
        opacity: 1;
        backdrop-filter: blur(4px);
    }
    to {
        opacity: 0;
        backdrop-filter: blur(0px);
    }
}

/* Skill bar animation */
.skill-bar-fill {
    transition: width 1s ease-out;
}

/* Keyframe animations for the fade effects */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeOut {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(-20px);
    }
}

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

/* Typing animation */
@keyframes blink {
    0%, 50% { border-color: #00bcd4; }
    51%, 100% { border-color: transparent; }
}

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

/* Fade-in classes */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease-out;
}

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

.fade-out {
    animation: fadeOut 1s ease-in-out forwards;
}

/* Theme-specific overrides */
#welcome-screen,
.bg-gray-900 {
    background-color: var(--bg-primary) !important;
}

.bg-gray-800,
header {
    background-color: var(--bg-secondary) !important;
}

.text-gray-300,
.text-white {
    color: var(--text-primary) !important;
}

.text-gray-400 {
    color: var(--text-secondary) !important;
}

.text-gray-500 {
    color: var(--text-muted) !important;
}

/* Theme toggle button adjustments */
#theme-toggle,
#theme-toggle-mobile {
    background-color: var(--bg-tertiary) !important;
    color: var(--accent-primary) !important;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    min-width: 44px;
    touch-action: manipulation;
    cursor: pointer;
    transition: all 0.2s ease;
}

#theme-toggle:hover,
#theme-toggle-mobile:hover {
    background-color: var(--border-color) !important;
    transform: scale(1.05);
}

#theme-toggle:active,
#theme-toggle-mobile:active {
    transform: scale(0.95);
}

/* Ensure theme toggle buttons work on all devices */
#theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    min-width: 44px;
    touch-action: manipulation;
    cursor: pointer;
    transition: all 0.2s ease;
}

/* Enhanced Animations and Effects */
@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 5px var(--accent-primary); }
    50% { box-shadow: 0 0 20px var(--accent-primary), 0 0 30px var(--accent-primary); }
}

@keyframes slide-in {
    from { transform: translateX(-50px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.hover-float:hover {
    animation: float 2s ease-in-out infinite;
}

.pulse-glow {
    animation: pulse-glow 2s ease-in-out infinite;
}

.slide-in {
    animation: slide-in 0.6s ease-out forwards;
}

/* Enhanced Card Hover Effects */
.card-hover {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform-origin: center;
}

.card-hover:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

/* Glassmorphism Effect */
.glass-effect {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Button Enhancement */
.btn-enhanced {
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.btn-enhanced::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn-enhanced:hover::before {
    left: 100%;
}

/* Particle Background */
.particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
}

.particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: var(--accent-primary);
    border-radius: 50%;
    opacity: 0.3;
    animation: particle-float 10s linear infinite;
}

@keyframes particle-float {
    0% { transform: translateY(100vh) translateX(0); opacity: 0; }
    10% { opacity: 0.3; }
    90% { opacity: 0.3; }
    100% { transform: translateY(-100px) translateX(100px); opacity: 0; }
}

/* Skill Progress Bars */
.skill-bar {
    width: 100%;
    height: 4px;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    width: 0%;
    border-radius: 2px;
    transition: width 1.5s ease-in-out;
    position: relative;
}

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

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

/* Easter Egg Animations */
@keyframes rainbow {
    0% { filter: hue-rotate(0deg); }
    100% { filter: hue-rotate(360deg); }
}

@keyframes bounce {
    0% { transform: translate(-50%, -50%) scale(1); }
    100% { transform: translate(-50%, -50%) scale(1.1); }
}

/* Enhanced Loading States */
.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    animation: loading-shimmer 1.5s infinite;
}

@keyframes loading-shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* Form Enhancement */
.form-field-error {
    border-color: #ef4444 !important;
    box-shadow: 0 0 0 2px rgba(239, 68, 68, 0.2) !important;
}

.form-field-success {
    border-color: #10b981 !important;
    box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.2) !important;
}

/* Accessibility Enhancements */
.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;
}

.focus\:not-sr-only:focus {
    position: static;
    width: auto;
    height: auto;
    padding: 0.5rem 1rem;
    margin: 0;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* Keyboard navigation focus indicators */
.keyboard-navigation *:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --bg-primary: #000000;
        --bg-secondary: #1a1a1a;
        --text-primary: #ffffff;
        --accent-primary: #00ffff;
    }
    
    .glass-effect {
        background: rgba(255, 255, 255, 0.2);
        border: 2px solid var(--accent-primary);
    }
}

/* Reduced motion support */
@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;
    }
    
    .hover-float:hover {
        animation: none;
    }
    
    .pulse-glow {
        animation: none;
    }
}

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

/* Utility Classes */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Grid System */
.grid {
    display: grid;
    gap: 1rem;
}

.grid-cols-1 {
    grid-template-columns: repeat(1, 1fr);
}

.gap-4 {
    gap: 1rem;
}

.gap-6 {
    gap: 1.5rem;
}

.gap-8 {
    gap: 2rem;
}

/* Flexbox utilities */
.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.flex-wrap {
    flex-wrap: wrap;
}

.justify-center {
    justify-content: center;
}

.items-center {
    align-items: center;
}

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

/* Spacing utilities */
.mb-6 {
    margin-bottom: 1.5rem;
}

.mb-8 {
    margin-bottom: 2rem;
}

.p-4 {
    padding: 1rem;
}

.p-6 {
    padding: 1.5rem;
}

/* Mobile First Responsive Breakpoints */

/* Small devices (phones, 576px and up) */
@media (min-width: 576px) {
    .container {
        padding: 0 1.5rem;
    }
    
    .modal-content {
        padding: 2.5rem;
    }
}

/* Medium devices (tablets, 768px and up) */
@media (min-width: 768px) {
    .container {
        padding: 0 2rem;
    }
    
    .grid.md\\:grid-cols-2 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .grid.md\\:grid-cols-3 {
        grid-template-columns: repeat(3, 1fr);
    }
    
    /* Typography adjustments for tablets */
    .text-4xl {
        font-size: 2.5rem;
    }
    
    .text-5xl {
        font-size: 3rem;
    }
    
    /* Skills section improvements */
    .skill-card {
        padding: 1.5rem;
    }
    
    /* Contact form improvements */
    .contact-form {
        padding: 2rem;
    }
}

/* Large devices (desktops, 992px and up) */
@media (min-width: 992px) {
    .grid.lg\\:grid-cols-3 {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .grid.lg\\:grid-cols-4 {
        grid-template-columns: repeat(4, 1fr);
    }
    
    /* Typography for desktop */
    .text-4xl {
        font-size: 3rem;
    }
    
    .text-5xl {
        font-size: 3.5rem;
    }
}

/* Mobile-specific styles (up to 767px) */
@media (max-width: 767px) {
    /* Header adjustments */
    h1 {
        font-size: 2rem !important;
        line-height: 1.2;
    }
    
    h2 {
        font-size: 1.5rem !important;
    }
    
    h3 {
        font-size: 1.25rem !important;
    }
    
    /* Container padding for mobile */
    .container {
        padding: 0 1rem;
    }
    
    /* Navigation improvements */
    .theme-toggle {
        padding: 0.5rem;
        font-size: 0.875rem;
    }
    
    /* Hero section mobile optimizations */
    .hero-section {
        padding: 2rem 0;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2rem;
        margin-bottom: 1rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
        margin-bottom: 1.5rem;
    }
    
    /* Skills cards mobile layout */
    .skill-card {
        padding: 1rem;
        margin-bottom: 1rem;
    }
    
    .skill-progress {
        margin-top: 0.5rem;
    }
    
    /* Tech cards mobile adjustments */
    .tech-card {
        padding: 1rem;
        margin-bottom: 1rem;
        text-align: center;
    }
    
    .tech-card h3 {
        font-size: 1rem;
        margin-bottom: 0.5rem;
    }
    
    .tech-card p {
        font-size: 0.875rem;
    }
    
    /* Contact section mobile optimization */
    .contact-form {
        padding: 1.5rem;
        margin: 0;
    }
    
    .contact-form input,
    .contact-form textarea {
        font-size: 16px; /* Prevents zoom on iOS */
        padding: 0.75rem;
    }
    
    .contact-form button {
        padding: 0.75rem 1.5rem;
        font-size: 1rem;
    }
    
    /* Modal mobile adjustments */
    .modal-content {
        padding: 1.5rem;
        margin: 1rem;
        max-width: calc(100vw - 2rem);
        max-height: calc(100vh - 2rem);
    }
    
    /* Footer mobile optimization */
    .footer-content {
        text-align: center;
        padding: 1.5rem 0;
    }
    
    /* Stats section mobile */
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    /* Hide desktop-only elements on mobile */
    .desktop-only {
        display: none;
    }
    
    /* Mobile navigation improvements */
    .mobile-nav {
        display: block;
    }
    
    /* Particle effects adjustment for mobile */
    .particle-container {
        opacity: 0.3;
    }
    
    /* Reduce animations on mobile for better performance */
    .tech-card:hover {
        transform: none;
    }
    
    /* Scroll progress bar mobile */
    .scroll-progress {
        height: 2px;
    }
    
    /* Visitor counter mobile */
    .visitor-counter {
        font-size: 0.875rem;
        padding: 0.5rem;
    }
}

/* Extra small devices (phones in landscape, 480px and up) */
@media (max-width: 480px) {
    /* Even smaller adjustments for very small screens */
    .container {
        padding: 0 0.75rem;
    }
    
    h1 {
        font-size: 1.75rem !important;
    }
    
    h2 {
        font-size: 1.25rem !important;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .hero-subtitle {
        font-size: 0.875rem;
    }
    
    .tech-card {
        padding: 0.75rem;
    }
    
    .skill-card {
        padding: 0.75rem;
    }
    
    .contact-form {
        padding: 1rem;
    }
    
    .modal-content {
        padding: 1rem;
    }
    
    /* Single column layout for very small screens */
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    /* Ensure buttons are touch-friendly */
    button, .button {
        min-height: 44px;
        min-width: 44px;
        padding: 0.75rem 1rem;
    }
    
    /* Theme toggle mobile positioning */
    .theme-toggle {
        position: fixed;
        top: 1rem;
        right: 1rem;
        z-index: 50;
        min-height: 44px;
        min-width: 44px;
    }
}

/* Landscape mobile optimization */
@media (max-height: 600px) and (orientation: landscape) {
    .hero-section {
        padding: 1rem 0;
    }
    
    .modal-content {
        max-height: calc(100vh - 1rem);
        margin: 0.5rem;
    }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
    /* Remove hover effects on touch devices */
    .tech-card:hover {
        transform: none;
        box-shadow: none;
    }
    
    /* Increase touch targets */
    .contact-form input,
    .contact-form textarea,
    .contact-form button {
        min-height: 44px;
    }
    
    /* Improve tap feedback */
    .tech-card:active {
        transform: scale(0.98);
        opacity: 0.8;
    }
    
    button:active,
    .button:active {
        transform: scale(0.98);
        opacity: 0.8;
    }
}

/* Mobile-specific body classes */
.mobile-device {
    /* Optimize text rendering on mobile */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

.mobile-device .particle-container {
    opacity: 0.2;
}

.mobile-device .tech-card {
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.mobile-viewport {
    /* Additional mobile viewport optimizations */
    font-size: 16px; /* Ensure consistent font size */
}

.mobile-landscape {
    /* Landscape-specific adjustments */
    overflow-x: hidden; /* Prevent horizontal scroll */
}

.mobile-landscape .hero-section {
    padding: 1rem 0;
}

.mobile-landscape .modal-content {
    max-height: calc(100vh - 2rem);
    overflow-y: auto;
}

/* Responsive image loading */
img.loaded {
    opacity: 1;
    transition: opacity 0.3s ease;
}

img[data-src] {
    opacity: 0;
}

/* Mobile navigation improvements */
@media (max-width: 767px) {
    .mobile-menu-link {
        padding: 1rem;
        display: block;
        width: 100%;
        text-align: center;
        border-radius: 0.5rem;
        margin: 0.5rem 0;
        transition: background-color 0.2s ease;
    }
    
    .mobile-menu-link:active {
        background-color: rgba(6, 182, 212, 0.1);
    }
    
    /* Improve mobile menu button */
    #mobile-menu-button {
        padding: 0.75rem;
        min-height: 44px;
        min-width: 44px;
    }
    
    /* Mobile-specific scroll behavior */
    html {
        scroll-padding-top: 2rem;
    }
    
    /* Optimize contact form for mobile keyboards */
    .contact-form input:focus,
    .contact-form textarea:focus {
        transform: translateY(-20px);
        transition: transform 0.2s ease;
    }
    
    /* Mobile-friendly skill bars */
    .skill-progress {
        height: 6px;
        border-radius: 3px;
    }
    
    .skill-progress-fill {
        border-radius: 3px;
    }
}