/* ============================================
   HACKER ACADEMY — RESPONSIVE STYLESHEET
   Premium Cyberpunk Responsive System
   Founded & Owned by Er. Priyanshu Sharma
   File: css/responsive.css
   Version: 1.0.0
   
   BREAKPOINTS:
   - 1400px : Large Desktop
   - 1200px : Desktop
   - 992px  : Small Desktop / Landscape Tablet
   - 768px  : Tablet Portrait
   - 576px  : Large Mobile
   - 480px  : Mobile
   - 380px  : Small Mobile
============================================ */

/* ============================================
   1. RESPONSIVE UTILITIES
============================================ */
.show-mobile { display: none !important; }
.show-tablet { display: none !important; }
.hide-mobile { display: block !important; }
.hide-tablet { display: block !important; }

/* ============================================
   2. LARGE DESKTOP (max-width: 1400px)
============================================ */
@media (max-width: 1400px) {
    .section-container {
        max-width: 1200px;
    }
    
    .nav-container {
        max-width: 1200px;
    }
    
    .footer-grid {
        max-width: 1200px;
    }
    
    .hero-stats {
        max-width: 800px;
    }
    
    .roadmap-wrap {
        max-width: 800px;
    }
}

/* ============================================
   3. DESKTOP (max-width: 1200px)
============================================ */
@media (max-width: 1200px) {
    /* Typography Adjustments */
    .hero-title {
        font-size: clamp(2.2rem, 6vw, 4.5rem);
    }
    
    .section-title {
        font-size: clamp(1.8rem, 4vw, 3rem);
    }
    
    /* Navigation */
    .nav-menu {
        gap: 28px;
    }
    
    .nav-link {
        font-size: 0.9rem;
    }
    
    /* Hero */
    .hero-stats {
        grid-template-columns: repeat(4, 1fr);
        gap: 16px;
    }
    
    .stat-card {
        padding: 20px 14px;
    }
    
    .stat-number {
        font-size: clamp(1.4rem, 2.5vw, 2rem);
    }
    
    /* About */
    .about-grid {
        gap: 40px;
    }
    
    /* Courses */
    .courses-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 22px;
    }
    
    /* AI Preview */
    .ai-preview {
        gap: 40px;
    }
    
    /* Contact */
    .contact-grid {
        gap: 36px;
    }
    
    /* Footer */
    .footer-grid {
        grid-template-columns: 1.5fr 1fr 1fr 1fr;
        gap: 40px;
    }
}

/* ============================================
   4. SMALL DESKTOP / LANDSCAPE TABLET (max-width: 992px)
============================================ */
@media (max-width: 992px) {
    /* Section Padding */
    .ha-section {
        padding: 80px 24px;
    }
    
    /* Typography */
    .hero-title {
        font-size: clamp(2rem, 5.5vw, 3.8rem);
        letter-spacing: -1px;
    }
    
    .section-title {
        font-size: clamp(1.6rem, 3.5vw, 2.6rem);
    }
    
    .section-subtitle {
        font-size: 1rem;
    }
    
    /* Hero Stats */
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        max-width: 500px;
    }
    
    /* About Section */
    .about-grid {
        grid-template-columns: 1fr;
        gap: 50px;
    }
    
    .about-visual {
        max-width: 600px;
        margin: 0 auto;
    }
    
    .about-content {
        text-align: center;
    }
    
    .about-content h2 {
        text-align: center;
    }
    
    .about-features {
        max-width: 600px;
        margin: 30px auto 0;
    }
    
    /* Features Grid */
    .features-grid {
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
        gap: 22px;
    }
    
    /* Roadmap */
    .roadmap-wrap {
        max-width: 700px;
    }
    
    .roadmap-line {
        left: 24px;
    }
    
    .roadmap-item {
        grid-template-columns: auto 1fr;
        gap: 20px;
    }
    
    .roadmap-item:nth-child(odd) .roadmap-content,
    .roadmap-item:nth-child(even) .roadmap-content {
        grid-column: 2;
        text-align: left;
    }
    
    .roadmap-dot {
        grid-column: 1;
    }
    
    .roadmap-item > div:last-child {
        display: none;
    }
    
    /* AI Preview */
    .ai-preview {
        grid-template-columns: 1fr;
        gap: 50px;
    }
    
    .ai-preview > div:first-child {
        text-align: center;
    }
    
    .ai-preview ul {
        max-width: 500px;
        margin: 0 auto;
    }
    
    .ai-preview ul li {
        justify-content: flex-start;
        text-align: left;
    }
    
    .ai-chat-mock {
        max-width: 600px;
        margin: 0 auto;
    }
    
    /* Testimonials */
    .testimonials-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 22px;
    }
    
    /* Contact */
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .contact-info-card,
    .contact-form {
        max-width: 600px;
        margin: 0 auto;
        width: 100%;
    }
    
    /* Footer */
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }
    
    .footer-brand {
        grid-column: 1 / -1;
        text-align: center;
    }
    
    .footer-social {
        justify-content: center;
    }
    
    /* Dashboard Preview */
    .dash-stats {
        grid-template-columns: repeat(3, 1fr);
    }
    
    /* Modal */
    .modal {
        max-width: 90%;
    }
    
    /* Toast */
    .toast-container {
        right: 20px;
        left: 20px;
    }
    
    .toast {
        min-width: auto;
        max-width: 100%;
    }
}

/* ============================================
   5. TABLET PORTRAIT (max-width: 768px)
============================================ */
@media (max-width: 768px) {
    /* Hide cursor glow on touch devices */
    .cursor-glow {
        display: none !important;
    }
    
    /* Disable heavy animations on mobile */
    .ha-loader-logo::before {
        animation-duration: 12s;
    }
    
    /* Section Padding */
    .ha-section {
        padding: 70px 20px;
    }
    
    .section-header {
        margin-bottom: 50px;
    }
    
    /* Navigation */
    .ha-nav {
        padding: 14px 0;
    }
    
    .nav-container {
        padding: 0 20px;
    }
    
    .nav-logo {
        font-size: 1.2rem;
    }
    
    .nav-logo-icon {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }
    
    .nav-logo-sub {
        font-size: 0.6rem;
        letter-spacing: 2px;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 68px;
        left: 0;
        right: 0;
        background: rgba(5, 5, 10, 0.98);
        backdrop-filter: blur(25px);
        -webkit-backdrop-filter: blur(25px);
        flex-direction: column;
        padding: 30px 20px;
        gap: 0;
        transform: translateY(-150%);
        transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        border-bottom: 1px solid var(--glass-border);
        max-height: calc(100vh - 68px);
        overflow-y: auto;
    }
    
    .nav-menu.active {
        transform: translateY(0);
    }
    
    .nav-menu li {
        width: 100%;
        border-bottom: 1px solid var(--glass-border);
    }
    
    .nav-menu li:last-child {
        border-bottom: none;
    }
    
    .nav-link {
        display: block;
        padding: 18px 0;
        font-size: 1rem;
        letter-spacing: 2px;
    }
    
    .nav-actions .btn-ghost {
        display: none;
    }
    
    .nav-actions .btn-primary {
        padding: 10px 20px;
        font-size: 0.8rem;
    }
    
    /* Hero */
    .ha-hero {
        padding: 100px 20px 60px;
        min-height: 100vh;
    }
    
    .hero-badge {
        font-size: 0.7rem;
        padding: 6px 16px;
        letter-spacing: 1.5px;
        margin-bottom: 24px;
    }
    
    .hero-title {
        font-size: clamp(1.8rem, 7vw, 3rem);
        margin-bottom: 20px;
    }
    
    .hero-typed-wrap {
        font-size: clamp(0.9rem, 3vw, 1.1rem);
        margin-bottom: 24px;
    }
    
    .hero-description {
        font-size: 0.95rem;
        margin-bottom: 32px;
        padding: 0 10px;
    }
    
    .hero-cta {
        flex-direction: column;
        gap: 14px;
        margin-bottom: 50px;
    }
    
    .hero-cta .btn {
        width: 100%;
        max-width: 320px;
    }
    
    /* About Features */
    .about-features {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .about-feature {
        padding: 12px 16px;
    }
    
    /* Courses Filter */
    .courses-filter {
        gap: 8px;
        margin-bottom: 40px;
    }
    
    .filter-btn {
        padding: 8px 16px;
        font-size: 0.75rem;
        letter-spacing: 1.5px;
    }
    
    /* Courses Grid */
    .courses-grid {
        grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
        gap: 20px;
    }
    
    .course-body {
        padding: 18px;
    }
    
    .course-title {
        font-size: 1.1rem;
    }
    
    /* Roadmap */
    .roadmap-content {
        padding: 20px;
    }
    
    .roadmap-title {
        font-size: 1.05rem;
    }
    
    .roadmap-desc {
        font-size: 0.85rem;
    }
    
    /* AI Chat */
    .ai-chat-mock {
        padding: 22px;
    }
    
    .ai-messages {
        min-height: 220px;
    }
    
    .ai-msg {
        font-size: 0.85rem;
        padding: 10px 14px;
    }
    
    /* Dashboard Preview */
    .dashboard-preview {
        padding: 20px;
    }
    
    .dash-header {
        flex-direction: column;
        gap: 14px;
        align-items: flex-start;
    }
    
    .dash-stats {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .dash-stat {
        padding: 14px;
    }
    
    /* Testimonials */
    .testimonials-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .testimonial-card {
        padding: 26px 22px;
    }
    
    /* FAQ */
    .faq-question {
        padding: 18px 20px;
        font-size: 0.95rem;
    }
    
    .faq-answer-inner {
        padding: 0 20px 18px;
        font-size: 0.9rem;
    }
    
    /* Contact */
    .contact-info-card,
    .contact-form {
        padding: 26px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }
    
    /* Footer */
    .ha-footer {
        padding: 50px 20px 24px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 36px;
        margin-bottom: 36px;
    }
    
    .footer-col {
        text-align: center;
    }
    
    .footer-col h4 {
        font-size: 0.95rem;
    }
    
    .footer-col ul li a {
        font-size: 0.88rem;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
        gap: 12px;
        padding-top: 24px;
        font-size: 0.75rem;
    }
    
    /* Back to Top */
    .back-to-top {
        width: 44px;
        height: 44px;
        bottom: 20px;
        right: 20px;
        font-size: 1rem;
    }
    
    /* Modal */
    .modal-overlay {
        padding: 16px;
    }
    
    .modal-header,
    .modal-body,
    .modal-footer {
        padding: 20px;
    }
    
    .modal-title {
        font-size: 1.05rem;
    }
    
    /* Toast */
    .toast-container {
        top: 80px;
        right: 16px;
        left: 16px;
    }
    
    .toast {
        padding: 14px 16px;
    }
    
    .toast-icon {
        width: 36px;
        height: 36px;
        font-size: 1rem;
    }
    
    .toast-title {
        font-size: 0.88rem;
    }
    
    .toast-message {
        font-size: 0.8rem;
    }
}

/* ============================================
   6. LARGE MOBILE (max-width: 576px)
============================================ */
@media (max-width: 576px) {
    /* Section Padding */
    .ha-section {
        padding: 60px 16px;
    }
    
    .section-header {
        margin-bottom: 40px;
    }
    
    .section-tag {
        font-size: 0.7rem;
        padding: 5px 14px;
        letter-spacing: 3px;
    }
    
    /* Navigation */
    .nav-container {
        padding: 0 16px;
    }
    
    .nav-logo-text {
        font-size: 1.05rem;
    }
    
    .nav-actions .btn-primary {
        padding: 8px 16px;
        font-size: 0.75rem;
        letter-spacing: 1.5px;
    }
    
    /* Hero */
    .ha-hero {
        padding: 90px 16px 50px;
    }
    
    .hero-badge {
        font-size: 0.65rem;
        padding: 5px 12px;
        margin-bottom: 20px;
    }
    
    .hero-title {
        font-size: clamp(1.6rem, 8vw, 2.4rem);
        letter-spacing: -0.5px;
    }
    
    .hero-typed-wrap {
        font-size: 0.85rem;
        margin-bottom: 20px;
    }
    
    .hero-description {
        font-size: 0.88rem;
        margin-bottom: 28px;
    }
    
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
    
    .stat-card {
        padding: 16px 10px;
    }
    
    .stat-number {
        font-size: 1.4rem;
    }
    
    .stat-label {
        font-size: 0.65rem;
        letter-spacing: 1.5px;
    }
    
    /* About */
    .about-visual {
        aspect-ratio: 4/3;
    }
    
    .about-visual-badge {
        padding: 10px 16px;
        font-size: 0.75rem;
    }
    
    /* Features */
    .feature-card {
        padding: 26px 22px;
    }
    
    .feature-icon {
        width: 54px;
        height: 54px;
        font-size: 1.5rem;
        margin-bottom: 18px;
    }
    
    .feature-card h3 {
        font-size: 1.05rem;
    }
    
    .feature-card p {
        font-size: 0.88rem;
    }
    
    /* Courses */
    .courses-grid {
        grid-template-columns: 1fr;
        gap: 18px;
    }
    
    .course-image {
        aspect-ratio: 16/9;
    }
    
    .course-badge,
    .course-level {
        padding: 5px 10px;
        font-size: 0.65rem;
    }
    
    .course-title {
        font-size: 1rem;
    }
    
    .course-meta {
        font-size: 0.7rem;
        gap: 12px;
    }
    
    .course-price {
        font-size: 1.1rem;
    }
    
    .course-enroll {
        padding: 6px 14px;
        font-size: 0.72rem;
    }
    
    /* Roadmap */
    .roadmap-line {
        left: 18px;
    }
    
    .roadmap-item {
        gap: 16px;
        margin-bottom: 30px;
    }
    
    .roadmap-dot {
        width: 20px;
        height: 20px;
    }
    
    .roadmap-content {
        padding: 18px;
    }
    
    .roadmap-step {
        font-size: 0.7rem;
    }
    
    .roadmap-title {
        font-size: 0.98rem;
    }
    
    .roadmap-desc {
        font-size: 0.82rem;
    }
    
    /* AI Preview */
    .ai-chat-mock {
        padding: 18px;
    }
    
    .ai-avatar {
        width: 42px;
        height: 42px;
        font-size: 1.2rem;
    }
    
    .ai-name {
        font-size: 0.95rem;
    }
    
    .ai-status {
        font-size: 0.7rem;
    }
    
    .ai-input-mock {
        padding: 10px 14px;
    }
    
    .ai-input-mock input {
        font-size: 0.85rem;
    }
    
    .ai-input-mock button {
        width: 32px;
        height: 32px;
    }
    
    /* Testimonials */
    .testimonial-card {
        padding: 22px 18px;
    }
    
    .testimonial-quote {
        font-size: 2.5rem;
    }
    
    .testimonial-text {
        font-size: 0.9rem;
        margin-bottom: 18px;
    }
    
    .testimonial-avatar {
        width: 44px;
        height: 44px;
    }
    
    .testimonial-name {
        font-size: 0.92rem;
    }
    
    .testimonial-role {
        font-size: 0.7rem;
    }
    
    /* Contact */
    .contact-info-card,
    .contact-form {
        padding: 22px 18px;
    }
    
    .contact-info-item {
        padding: 14px 0;
        gap: 14px;
    }
    
    .contact-info-icon {
        width: 42px;
        height: 42px;
        font-size: 1.05rem;
    }
    
    .contact-info-label {
        font-size: 0.7rem;
    }
    
    .contact-info-value {
        font-size: 0.92rem;
    }
    
    .form-input,
    .form-textarea,
    .form-select {
        padding: 12px 14px;
        font-size: 0.9rem;
    }
    
    .form-label {
        font-size: 0.7rem;
        margin-bottom: 8px;
    }
    
    /* Footer */
    .ha-footer {
        padding: 40px 16px 20px;
    }
    
    .footer-brand p {
        font-size: 0.88rem;
        margin: 14px 0;
    }
    
    .footer-social a {
        width: 38px;
        height: 38px;
        font-size: 0.9rem;
    }
    
    .footer-col h4 {
        font-size: 0.88rem;
        margin-bottom: 16px;
    }
    
    .footer-col ul li {
        margin-bottom: 10px;
    }
    
    .footer-col ul li a {
        font-size: 0.82rem;
    }
    
    .footer-bottom {
        font-size: 0.7rem;
        padding-top: 20px;
    }
    
    /* Buttons */
    .btn {
        padding: 12px 24px;
        font-size: 0.82rem;
        letter-spacing: 1.8px;
    }
    
    .btn-lg {
        padding: 14px 32px;
        font-size: 0.9rem;
    }
    
    .btn-sm {
        padding: 7px 14px;
        font-size: 0.72rem;
    }
}

/* ============================================
   7. MOBILE (max-width: 480px)
============================================ */
@media (max-width: 480px) {
    /* Hero */
    .hero-title {
        font-size: clamp(1.5rem, 8.5vw, 2rem);
    }
    
    .hero-typed-wrap {
        font-size: 0.8rem;
    }
    
    .hero-description {
        font-size: 0.85rem;
        padding: 0;
    }
    
    .hero-badge {
        font-size: 0.6rem;
        padding: 4px 10px;
        letter-spacing: 1px;
    }
    
    .hero-stats {
        gap: 10px;
    }
    
    .stat-card {
        padding: 14px 8px;
    }
    
    .stat-number {
        font-size: 1.25rem;
    }
    
    .stat-label {
        font-size: 0.6rem;
    }
    
    /* About */
    .about-visual-badge {
        bottom: 12px;
        left: 12px;
        padding: 8px 12px;
        font-size: 0.68rem;
    }
    
    /* Courses */
    .courses-filter {
        gap: 6px;
    }
    
    .filter-btn {
        padding: 6px 12px;
        font-size: 0.68rem;
    }
    
    .course-body {
        padding: 16px;
    }
    
    .course-footer {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    
    .course-enroll {
        width: 100%;
        text-align: center;
    }
    
    /* Roadmap */
    .roadmap-line {
        left: 14px;
    }
    
    .roadmap-dot {
        width: 16px;
        height: 16px;
    }
    
    .roadmap-content {
        padding: 16px;
    }
    
    .roadmap-step {
        font-size: 0.65rem;
        letter-spacing: 1.5px;
    }
    
    .roadmap-title {
        font-size: 0.92rem;
    }
    
    .roadmap-desc {
        font-size: 0.78rem;
    }
    
    /* AI Preview */
    .ai-chat-header {
        padding-bottom: 14px;
        margin-bottom: 14px;
    }
    
    .ai-avatar {
        width: 38px;
        height: 38px;
        font-size: 1rem;
    }
    
    .ai-messages {
        min-height: 180px;
        gap: 10px;
    }
    
    .ai-msg {
        font-size: 0.8rem;
        padding: 9px 12px;
        max-width: 90%;
    }
    
    /* Testimonials */
    .testimonial-quote {
        font-size: 2rem;
    }
    
    .testimonial-text {
        font-size: 0.85rem;
    }
    
    /* Contact */
    .contact-info-item {
        gap: 12px;
    }
    
    .contact-info-icon {
        width: 38px;
        height: 38px;
        font-size: 0.95rem;
    }
    
    .contact-info-label {
        font-size: 0.65rem;
    }
    
    .contact-info-value {
        font-size: 0.85rem;
    }
    
    /* Footer */
    .footer-social {
        gap: 8px;
    }
    
    .footer-social a {
        width: 34px;
        height: 34px;
        font-size: 0.85rem;
    }
    
    /* Back to Top */
    .back-to-top {
        width: 40px;
        height: 40px;
        bottom: 16px;
        right: 16px;
        font-size: 0.9rem;
    }
    
    /* Toast */
    .toast-container {
        top: 70px;
        right: 12px;
        left: 12px;
    }
    
    .toast {
        padding: 12px 14px;
        gap: 10px;
    }
    
    .toast-icon {
        width: 32px;
        height: 32px;
        font-size: 0.9rem;
    }
    
    .toast-title {
        font-size: 0.82rem;
    }
    
    .toast-message {
        font-size: 0.75rem;
    }
    
    /* Modal */
    .modal-header,
    .modal-body,
    .modal-footer {
        padding: 16px;
    }
    
    .modal-title {
        font-size: 0.98rem;
    }
    
    .modal-close {
        width: 32px;
        height: 32px;
    }
}

/* ============================================
   8. SMALL MOBILE (max-width: 380px)
============================================ */
@media (max-width: 380px) {
    /* Navigation */
    .nav-logo-text {
        font-size: 0.95rem;
    }
    
    .nav-logo-sub {
        display: none;
    }
    
    .nav-logo-icon {
        width: 36px;
        height: 36px;
        font-size: 1.05rem;
    }
    
    .nav-actions .btn-primary {
        padding: 7px 12px;
        font-size: 0.7rem;
    }
    
    /* Hero */
    .hero-title {
        font-size: 1.4rem;
    }
    
    .hero-typed-wrap {
        font-size: 0.75rem;
    }
    
    .hero-description {
        font-size: 0.8rem;
    }
    
    .hero-stats {
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }
    
    .stat-card {
        padding: 12px 6px;
    }
    
    .stat-number {
        font-size: 1.1rem;
    }
    
    .stat-label {
        font-size: 0.55rem;
        letter-spacing: 1px;
    }
    
    /* Sections */
    .ha-section {
        padding: 50px 14px;
    }
    
    .section-tag {
        font-size: 0.65rem;
        padding: 4px 10px;
    }
    
    .section-title {
        font-size: 1.4rem;
    }
    
    .section-subtitle {
        font-size: 0.85rem;
    }
    
    /* Features */
    .feature-card {
        padding: 22px 18px;
    }
    
    .feature-icon {
        width: 48px;
        height: 48px;
        font-size: 1.3rem;
    }
    
    .feature-card h3 {
        font-size: 0.98rem;
    }
    
    .feature-card p {
        font-size: 0.82rem;
    }
    
    /* Courses */
    .course-title {
        font-size: 0.95rem;
    }
    
    .course-meta {
        font-size: 0.65rem;
        gap: 10px;
    }
    
    /* Roadmap */
    .roadmap-content {
        padding: 14px;
    }
    
    .roadmap-title {
        font-size: 0.88rem;
    }
    
    .roadmap-desc {
        font-size: 0.75rem;
    }
    
    /* AI Preview */
    .ai-chat-mock {
        padding: 14px;
    }
    
    .ai-msg {
        font-size: 0.75rem;
        padding: 8px 10px;
    }
    
    /* Testimonials */
    .testimonial-card {
        padding: 18px 14px;
    }
    
    .testimonial-text {
        font-size: 0.82rem;
    }
    
    /* Contact */
    .contact-info-card,
    .contact-form {
        padding: 18px 14px;
    }
    
    /* Footer */
    .footer-bottom {
        font-size: 0.65rem;
    }
    
    /* Buttons */
    .btn {
        padding: 10px 20px;
        font-size: 0.75rem;
        letter-spacing: 1.5px;
    }
}

/* ============================================
   9. LANDSCAPE ORIENTATION
============================================ */
@media (max-height: 500px) and (orientation: landscape) {
    .ha-hero {
        min-height: auto;
        padding: 80px 20px 40px;
    }
    
    .hero-title {
        font-size: clamp(1.5rem, 4vw, 2.2rem);
        margin-bottom: 16px;
    }
    
    .hero-typed-wrap {
        font-size: 0.85rem;
        margin-bottom: 16px;
    }
    
    .hero-description {
        font-size: 0.85rem;
        margin-bottom: 24px;
    }
    
    .hero-stats {
        grid-template-columns: repeat(4, 1fr);
        gap: 12px;
    }
    
    .nav-menu {
        max-height: calc(100vh - 60px);
    }
    
    .modal {
        max-height: 85vh;
    }
}

/* ============================================
   10. HIGH DPI / RETINA DISPLAYS
============================================ */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .hero-title,
    .section-title {
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
        text-rendering: optimizeLegibility;
    }
    
    .nav-logo-icon,
    .feature-icon,
    .ai-avatar {
        transform: translateZ(0);
    }
}

/* ============================================
   11. REDUCED MOTION PREFERENCE
============================================ */
@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;
    }
    
    .ha-loader-logo,
    .ha-loader-logo::before,
    .ha-loader-bar::after {
        animation: none !important;
    }
    
    .matrix-canvas {
        display: none !important;
    }
    
    #vanta-bg {
        opacity: 0.3 !important;
    }
    
    .scan-line {
        display: none !important;
    }
    
    .progress-bar::after {
        animation: none !important;
    }
}

/* ============================================
   12. DARK MODE ENHANCEMENTS (already dark, but for OLED)
============================================ */
@media (prefers-color-scheme: dark) {
    :root {
        --cyber-black: #000000;
        --cyber-dark: #000000;
    }
    
    .glass,
    .card {
        background: rgba(5, 5, 10, 0.7);
    }
}

/* ============================================
   13. PRINT STYLES
============================================ */
@media print {
    .ha-nav,
    .ha-footer,
    .back-to-top,
    .cursor-glow,
    .ha-loader,
    .matrix-canvas,
    #vanta-bg,
    .hero-grid-overlay,
    .hero-vignette,
    .scan-line {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
    
    .ha-section {
        padding: 20px 0 !important;
        page-break-inside: avoid;
    }
    
    .glass,
    .card,
    .feature-card,
    .course-card,
    .testimonial-card {
        background: white !important;
        color: black !important;
        border: 1px solid #ddd !important;
        box-shadow: none !important;
        backdrop-filter: none !important;
    }
    
    .text-gradient,
    .text-gradient-neon,
    .neon-text {
        color: black !important;
        -webkit-text-fill-color: black !important;
        text-shadow: none !important;
    }
    
    .btn {
        border: 1px solid black !important;
        background: white !important;
        color: black !important;
    }
    
    a {
        color: black !important;
        text-decoration: underline !important;
    }
    
    img {
        max-width: 100% !important;
        page-break-inside: avoid;
    }
    
    h1, h2, h3, h4 {
        page-break-after: avoid;
    }
}

/* ============================================
   14. TOUCH DEVICE OPTIMIZATIONS
============================================ */
@media (hover: none) and (pointer: coarse) {
    /* Disable hover effects on touch devices */
    .card:hover,
    .feature-card:hover,
    .course-card:hover,
    .testimonial-card:hover,
    .stat-card:hover,
    .about-feature:hover {
        transform: none !important;
    }
    
    /* Larger touch targets */
    .btn {
        min-height: 44px;
    }
    
    .nav-link {
        min-height: 44px;
        display: flex;
        align-items: center;
    }
    
    .faq-question {
        min-height: 48px;
    }
    
    .accordion-header {
        min-height: 48px;
    }
    
    /* Disable cursor glow */
    .cursor-glow {
        display: none !important;
    }
    
    /* Remove hover underline animations */
    .nav-link::after {
        display: none;
    }
    
    /* Active states instead of hover */
    .btn:active {
        transform: scale(0.97);
    }
    
    .card:active,
    .feature-card:active,
    .course-card:active {
        transform: scale(0.98);
        border-color: var(--neon-green);
    }
}

/* ============================================
   15. KEYBOARD NAVIGATION
============================================ */
@media (hover: hover) and (pointer: fine) {
    /* Only apply hover effects on devices with hover capability */
    .nav-link:hover::after {
        width: 100%;
    }
    
    .card:hover,
    .feature-card:hover,
    .course-card:hover {
        transform: translateY(-6px);
    }
}

/* ============================================
   16. RESPONSIVE UTILITIES CLASSES
============================================ */
@media (max-width: 992px) {
    .hide-tablet { display: none !important; }
    .show-tablet { display: block !important; }
}

@media (max-width: 768px) {
    .hide-mobile { display: none !important; }
    .show-mobile { display: block !important; }
    
    .text-center-mobile { text-align: center !important; }
    .text-left-mobile { text-align: left !important; }
    
    .grid-2-mobile { grid-template-columns: repeat(2, 1fr) !important; }
    .grid-1-mobile { grid-template-columns: 1fr !important; }
    
    .flex-col-mobile { flex-direction: column !important; }
    .flex-row-mobile { flex-direction: row !important; }
}

@media (max-width: 576px) {
    .grid-1-small { grid-template-columns: 1fr !important; }
    .text-center-small { text-align: center !important; }
}

/* ============================================
   17. SAFE AREA INSETS (Notch Devices)
============================================ */
@supports (padding: max(0px)) {
    .ha-nav {
        padding-top: max(14px, env(safe-area-inset-top));
    }
    
    .ha-footer {
        padding-bottom: max(24px, env(safe-area-inset-bottom));
    }
    
    .back-to-top {
        bottom: max(20px, env(safe-area-inset-bottom));
        right: max(20px, env(safe-area-inset-right));
    }
    
    .toast-container {
        top: max(80px, env(safe-area-inset-top));
        right: max(16px, env(safe-area-inset-right));
        left: max(16px, env(safe-area-inset-left));
    }
}

/* ============================================
   18. FOLDABLE DEVICES
============================================ */
@media (horizontal-viewport-segments: 2) {
    .hero-stats {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .courses-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ============================================
   END OF RESPONSIVE STYLESHEET
============================================ */