/* ============================================
   ATUL KUMAR PORTFOLIO - RESPONSIVE STYLES
   Mobile-First Approach
   ============================================ */

/* ============================================
   BASE MOBILE STYLES (up to 576px)
   ============================================ */

body {
    font-size: 1rem;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

.navbar-custom {
    padding: 1rem 0;
}

.navbar-brand {
    font-size: 1.25rem;
}

.brand-icon {
    width: 28px;
    height: 28px;
    font-size: 0.75rem;
}

.brand-text {
    font-size: 1rem;
}

section {
    padding: 3rem 0;
}

.section-title {
    font-size: 1.75rem;
    margin-bottom: 1rem;
}

.hero-section {
    min-height: 100vh;
    margin-top: 60px;
}

.hero-title {
    font-size: 2.25rem;
    line-height: 1.2;
    margin: 1rem 0;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.hero-description {
    font-size: 1rem;
    margin-bottom: 1.5rem;
}

.hero-cta-group {
    flex-direction: column;
    gap: 1rem;
}

.hero-cta-group .btn {
    width: 100%;
    justify-content: center;
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
}

/* Navigation Mobile Menu */
.navbar-toggler {
    border: none;
    padding: 0.25rem 0.75rem;
}

.navbar-toggler:focus {
    outline: 2px solid var(--color-primary);
}

.navbar-collapse {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--color-glass-light);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 999;
}

.navbar-nav {
    gap: 0.5rem !important;
}

.nav-item {
    width: 100%;
}

.nav-link {
    padding: 1rem !important;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

html[data-theme="dark"] .nav-link {
    border-bottom-color: rgba(255, 255, 255, 0.1);
}

.nav-link:after {
    display: none;
}

.nav-link.active:after,
.nav-link:hover:after {
    display: none;
}

.nav-link.active {
    background: var(--color-primary-light);
    border-radius: 0.5rem;
    margin: 0 0.5rem;
}

/* About Section */
.about-card {
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.avatar-initials {
    width: 80px;
    height: 80px;
    margin: 0 auto 1rem;
    font-size: 2.5rem;
}

.about-avatar {
    width: 80px;
    height: 80px;
    margin: 0 auto 1rem;
}

.about-content {
    padding: 1rem;
}

.about-highlights {
    gap: 1rem;
}

.highlight-item {
    gap: 0.75rem;
}

/* Skills Grid */
.skills-grid {
    gap: 1.5rem;
    grid-template-columns: 1fr;
}

.skill-card {
    padding: 1.5rem;
}

.skill-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.skill-title {
    font-size: 1.125rem;
}

/* Timeline */
.timeline::before {
    left: 12px;
}

.timeline-marker {
    width: 32px;
    height: 32px;
    left: -4px;
    font-size: 0.875rem;
}

.timeline-item {
    padding-left: 60px;
    margin-bottom: 1.5rem;
}

.timeline-content {
    padding: 1rem;
}

.timeline-title {
    font-size: 1rem;
}

/* Education Grid */
.education-grid {
    gap: 1.5rem;
    grid-template-columns: 1fr;
}

.education-card {
    padding: 1.5rem;
}

.education-degree {
    font-size: 1rem;
}

.education-university {
    font-size: 0.875rem;
}

.detail-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 1rem;
}

/* Projects Section */
.project-showcase {
    padding: 1.5rem;
}

.project-header {
    flex-direction: column;
    gap: 1rem;
}

.project-icon {
    font-size: 2.5rem;
}

.project-title {
    font-size: 1.125rem;
}

.project-tags {
    gap: 0.5rem;
}

/* Services & Languages */
.services-grid,
.languages-grid {
    gap: 1.5rem;
    grid-template-columns: 1fr;
}

.service-card,
.language-card {
    padding: 1.5rem;
}

.service-icon,
.language-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

/* Contact Section */
.contact-description {
    font-size: 1rem;
}

.contact-links {
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.contact-button {
    flex-direction: column;
    padding: 1rem 1.5rem;
    font-size: 1rem;
    width: 100%;
    justify-content: center;
}

.contact-button i {
    font-size: 1.5rem;
}

.contact-info {
    gap: 1rem;
}

/* Back to Top Button */
.back-to-top {
    bottom: 1.5rem;
    right: 1.5rem;
    width: 44px;
    height: 44px;
    font-size: 1rem;
}

/* Footer */
.footer-content {
    flex-direction: column;
    text-align: center;
}

.footer-text {
    flex: none;
    min-width: auto;
}

.footer-copyright,
.footer-credit {
    font-size: 0.875rem;
}

.footer-social {
    gap: 1rem;
}

.social-link {
    width: 36px;
    height: 36px;
}

/* Container */
.container,
.container-fluid {
    padding: 0 1rem;
}

/* ============================================
   TABLET STYLES (576px - 992px)
   ============================================ */

@media (min-width: 576px) {
    body {
        font-size: 1rem;
    }
    
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.75rem; }
    
    section {
        padding: 4rem 0;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-title {
        font-size: 2.75rem;
    }
    
    .hero-subtitle {
        font-size: 1.5rem;
    }
    
    .hero-description {
        font-size: 1.125rem;
    }
    
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }
    
    .education-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }
    
    .education-card {
        padding: 2rem;
    }
    
    .services-grid,
    .languages-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }
    
    .about-card {
        padding: 2rem;
    }
    
    .avatar-initials {
        width: 100px;
        height: 100px;
        font-size: 3rem;
    }
    
    .about-avatar {
        width: 100px;
        height: 100px;
    }
    
    .timeline-item {
        padding-left: 80px;
    }
    
    .timeline-marker {
        width: 40px;
        height: 40px;
        left: -12px;
        font-size: 1rem;
    }
    
    .btn-lg {
        padding: 0.875rem 2rem;
        font-size: 1.125rem;
    }
    
    .navbar-collapse {
        position: static;
        background: transparent;
        border: none;
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
    }
    
    .navbar-nav {
        gap: 0.5rem !important;
    }
    
    .nav-item {
        width: auto;
    }
    
    .nav-link {
        padding: 0.5rem 1rem !important;
        border: none;
        border-bottom: 2px solid transparent;
    }
    
    .nav-link.active {
        background: transparent;
        margin: 0;
    }
    
    .nav-link:after {
        display: block;
    }
    
    .project-showcase {
        padding: 2rem;
    }
    
    .project-header {
        flex-direction: row;
        gap: 1.5rem;
    }
    
    .detail-item {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        gap: 1rem;
    }
    
    .contact-button {
        flex-direction: row;
        width: auto;
    }
    
    .contact-links {
        gap: 1.5rem;
    }
}

/* ============================================
   DESKTOP STYLES (992px and above)
   ============================================ */

@media (min-width: 992px) {
    body {
        font-size: 1rem;
    }
    
    h1 { font-size: 3rem; }
    h2 { font-size: 2.25rem; }
    h3 { font-size: 1.875rem; }
    
    section {
        padding: 5rem 0;
    }
    
    .section-title {
        font-size: 2.25rem;
    }
    
    .hero-section {
        min-height: 100vh;
    }
    
    .hero-title {
        font-size: 3.5rem;
        margin: 1.5rem 0;
    }
    
    .hero-subtitle {
        font-size: 1.75rem;
    }
    
    .hero-description {
        font-size: 1.25rem;
    }
    
    .hero-cta-group {
        flex-direction: row;
        gap: 2rem;
    }
    
    .hero-cta-group .btn {
        width: auto;
    }
    
    .skills-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 2rem;
    }
    
    .education-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2.5rem;
    }
    
    .education-card {
        padding: 2.5rem;
    }
    
    .services-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 2rem;
    }
    
    .languages-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }
    
    .about-card {
        padding: 3rem;
    }
    
    .avatar-initials {
        width: 120px;
        height: 120px;
        font-size: 3.5rem;
    }
    
    .about-avatar {
        width: 120px;
        height: 120px;
    }
    
    .about-content {
        padding: 0;
    }
    
    .timeline-item {
        padding-left: 80px;
    }
    
    .timeline-marker {
        width: 44px;
        height: 44px;
        left: -12px;
        font-size: 1.125rem;
    }
    
    .project-showcase {
        padding: 3rem;
    }
    
    .btn-lg {
        padding: 1rem 2.5rem;
        font-size: 1.125rem;
    }
    
    .container {
        max-width: 1200px;
    }
    
    .navbar-custom {
        padding: 1.25rem 0;
    }
    
    .nav-link {
        padding: 0.5rem 1rem !important;
    }
    
    .footer-content {
        flex-direction: row;
        justify-content: space-between;
    }
    
    .footer-text {
        flex: 1;
        text-align: left;
    }
}

/* ============================================
   LARGE DESKTOP (1200px and above)
   ============================================ */

@media (min-width: 1200px) {
    .container {
        max-width: 1200px;
    }
    
    section {
        padding: 6rem 0;
    }
    
    .hero-title {
        font-size: 3.75rem;
    }
    
    .about-highlights {
        flex-direction: row;
        justify-content: space-between;
    }
    
    .highlight-item {
        flex-direction: column;
        text-align: center;
    }
}

/* ============================================
   LANDSCAPE MODE ADJUSTMENTS
   ============================================ */

@media (max-height: 600px) and (orientation: landscape) {
    .hero-section {
        min-height: auto;
        padding: 3rem 0;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-scroll-indicator {
        display: none;
    }
}

/* ============================================
   HIGH DPI / RETINA DISPLAYS
   ============================================ */

@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .scroll-wheel {
        width: 3px;
    }
}

/* ============================================
   TOUCH DEVICE OPTIMIZATIONS
   ============================================ */

@media (hover: none) and (pointer: coarse) {
    .btn {
        padding: 1rem 1.5rem;
        min-height: 48px;
        min-width: 48px;
    }
    
    .btn:active {
        transform: scale(0.98);
    }
    
    .skill-card:hover,
    .service-card:hover,
    .education-card:hover,
    .language-card:hover {
        transform: none;
    }
    
    .back-to-top {
        bottom: 2rem;
        right: 2rem;
        width: 56px;
        height: 56px;
    }
    
    .timeline-content:hover {
        transform: none;
    }
    
    .contact-button:hover {
        transform: none;
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
    :root {
        --color-bg-light: white;
        --color-text-dark: black;
    }
    
    body {
        background: white;
        color: black;
        font-size: 12pt;
    }
    
    .navbar-custom,
    .scroll-progress,
    .back-to-top,
    .hero-scroll-indicator,
    .navbar-toggler {
        display: none !important;
    }
    
    section {
        page-break-inside: avoid;
        padding: 1rem 0;
    }
    
    .hero-section {
        min-height: auto;
    }
    
    a {
        text-decoration: underline;
    }
    
    .glass-effect {
        background: white;
        border: 1px solid #ccc;
        backdrop-filter: none;
    }
    
    h1, h2, h3, h4, h5, h6 {
        page-break-after: avoid;
    }
    
    .education-grid,
    .skills-grid,
    .services-grid,
    .languages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ============================================
   DARK MODE RESPONSIVE ADJUSTMENTS
   ============================================ */

html[data-theme="dark"] .navbar-collapse {
    background: rgba(15, 23, 42, 0.95);
}

html[data-theme="dark"] .nav-link {
    border-bottom-color: rgba(255, 255, 255, 0.1);
}

/* ============================================
   ACCESSIBILITY ADJUSTMENTS
   ============================================ */

@media (prefers-contrast: more) {
    :root {
        --color-border-light: #333;
        --color-border-medium: #666;
    }
    
    .glass-effect {
        border-width: 2px;
    }
}

@media (prefers-color-scheme: dark) {
    html:not([data-theme]) {
        --color-bg-light: #0f172a;
        --color-bg-secondary: #1a1f3a;
        --color-text-dark: #f1f5f9;
        --color-text-secondary: #cbd5e1;
        --color-text-tertiary: #94a3b8;
    }
}

/* ============================================
   FINAL RESPONSIVE POLISH
   ============================================ */

@media (max-width: 575.98px) {
    .container,
    .container-fluid {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .hero-section .container {
        padding-top: 1rem;
        padding-bottom: 4rem;
    }

    .hero-scroll-indicator {
        bottom: 1rem;
    }

    .hero-scroll-indicator span {
        font-size: .75rem;
    }

    .about-highlights {
        flex-direction: column;
    }

    .highlight-item {
        width: 100%;
    }

    .timeline-header {
        align-items: flex-start;
        flex-direction: column;
        gap: .55rem;
    }

    .timeline-item {
        padding-left: 52px;
    }

    .timeline::before {
        left: 9px;
    }

    .timeline-marker {
        left: -5px;
    }

    .project-showcase,
    .about-card,
    .skill-card,
    .education-card,
    .service-card,
    .language-card {
        border-radius: 1.15rem;
    }

    .contact-info {
        align-items: flex-start;
    }
}