/* ==========================================================================
   QueStudy Theme - Responsive Breakpoints
   Premium SaaS WordPress Theme
   ========================================================================== */

/* --------------------------------------------------------------------------
   1200px — Reduce grid columns, adjust spacing
   -------------------------------------------------------------------------- */
@media (max-width: 1200px) {
    .qs-container {
        max-width: 960px;
        padding-left: 24px;
        padding-right: 24px;
    }

    .qs-hero__headline {
        font-size: 3.25rem;
    }

    .qs-features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }

    .qs-exam-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .qs-subjects-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }

    .qs-stats-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 24px;
    }

    .qs-performers-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .qs-testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }

    .qs-footer__grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 40px;
    }

    .qs-pricing-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }

    .qs-docs-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* --------------------------------------------------------------------------
   1024px — Tablet landscape / small desktop
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
    .qs-container {
        max-width: 720px;
        padding-left: 20px;
        padding-right: 20px;
    }

    /* Hero */
    .qs-hero {
        padding-top: 80px;
        padding-bottom: 60px;
    }

    .qs-hero__grid {
        grid-template-columns: 1fr;
        gap: 48px;
        text-align: center;
    }

    .qs-hero__content {
        order: 1;
    }

    .qs-hero__illustration {
        order: 2;
        max-width: 520px;
        margin: 0 auto;
    }

    .qs-hero__headline {
        font-size: 2.75rem;
    }

    .qs-hero__subheadline {
        font-size: 1.125rem;
    }

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

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

    /* Features */
    .qs-features-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }

    .qs-feature-card {
        padding: 28px;
    }

    /* Why Choose */
    .qs-why__grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }

    /* Exam */
    .qs-exam-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    /* Subjects */
    .qs-subjects-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
    }

    /* Stats */
    .qs-stats-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }

    .qs-stat-card:nth-child(4) {
        grid-column: span 1;
    }

    /* Performers */
    .qs-performers-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    /* Testimonials */
    .qs-testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    /* Footer */
    .qs-footer__grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 32px;
    }

    .qs-footer__bottom {
        flex-wrap: wrap;
        gap: 16px;
    }

    /* Sidebar — collapsible */
    .qs-sidebar {
        position: fixed;
        top: 0;
        left: -280px;
        width: 280px;
        height: 100vh;
        z-index: 1000;
        transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        overflow-y: auto;
    }

    .qs-sidebar.is-open {
        left: 0;
    }

    .qs-sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
        opacity: 0;
        transition: opacity 0.3s ease;
    }

    .qs-sidebar-overlay.is-visible {
        display: block;
        opacity: 1;
    }

    .qs-sidebar-toggle {
        display: flex;
    }

    /* Dashboard */
    .qs-dashboard__content {
        margin-left: 0;
    }

    /* Pricing */
    .qs-pricing-grid {
        gap: 24px;
    }

    /* Docs */
    .qs-docs-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* CTA */
    .qs-cta {
        padding: 60px 0;
    }

    .qs-cta__headline {
        font-size: 2.25rem;
    }
}

/* --------------------------------------------------------------------------
   768px — Tablet portrait
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
    /* Nav: hide desktop, show hamburger */
    .qs-nav__desktop {
        display: none !important;
    }

    .qs-nav__hamburger {
        display: flex;
    }

    .qs-nav__actions--desktop {
        display: none;
    }

    .qs-nav__actions--mobile {
        display: flex;
    }

    /* Hero */
    .qs-hero {
        padding-top: 60px;
        padding-bottom: 48px;
    }

    .qs-hero__grid {
        grid-template-columns: 1fr;
        gap: 32px;
        text-align: center;
    }

    .qs-hero__headline {
        font-size: 2.5rem;
    }

    .qs-hero__subheadline {
        font-size: 1.0625rem;
    }

    .qs-hero__illustration {
        max-width: 400px;
        margin: 0 auto;
    }

    .qs-hero__actions {
        flex-direction: column;
        align-items: center;
    }

    .qs-hero__actions .qs-btn {
        width: 100%;
        max-width: 320px;
    }

    .qs-hero__trust {
        flex-wrap: wrap;
        justify-content: center;
        gap: 12px;
    }

    /* Features */
    .qs-features {
        padding: 60px 0;
    }

    .qs-features__headline {
        font-size: 2rem;
    }

    .qs-features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .qs-feature-card {
        padding: 24px;
    }

    .qs-feature-card__icon {
        width: 48px;
        height: 48px;
    }

    /* Why Choose */
    .qs-why {
        padding: 60px 0;
    }

    .qs-why__grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .qs-why__headline {
        font-size: 2rem;
    }

    /* Exam */
    .qs-exam {
        padding: 60px 0;
    }

    .qs-exam__headline {
        font-size: 2rem;
    }

    .qs-exam-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    /* Subjects */
    .qs-subjects {
        padding: 60px 0;
    }

    .qs-subjects__headline {
        font-size: 2rem;
    }

    .qs-subjects-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .qs-subject-card {
        padding: 20px;
    }

    /* Stats */
    .qs-stats {
        padding: 60px 0;
    }

    .qs-stats__headline {
        font-size: 2rem;
    }

    .qs-stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .qs-stat-card {
        padding: 24px 16px;
    }

    .qs-stat-card__number {
        font-size: 2rem;
    }

    /* Performers */
    .qs-performers {
        padding: 60px 0;
    }

    .qs-performers__headline {
        font-size: 2rem;
    }

    .qs-performers-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    /* Testimonials */
    .qs-testimonials {
        padding: 60px 0;
    }

    .qs-testimonials__headline {
        font-size: 2rem;
    }

    .qs-testimonials-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    /* Final CTA */
    .qs-cta {
        padding: 48px 0;
    }

    .qs-cta__headline {
        font-size: 2rem;
    }

    .qs-cta__subheadline {
        font-size: 1rem;
    }

    .qs-cta__actions {
        flex-direction: column;
        align-items: center;
    }

    .qs-cta__actions .qs-btn {
        width: 100%;
        max-width: 320px;
    }

    /* Footer */
    .qs-footer {
        padding: 48px 0 0;
    }

    .qs-footer__grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }

    .qs-footer__brand {
        grid-column: span 2;
        text-align: center;
    }

    .qs-footer__brand-desc {
        margin: 12px auto 0;
    }

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

    .qs-footer__heading {
        margin-bottom: 16px;
    }

    .qs-footer__links {
        gap: 10px;
    }

    .qs-footer__bottom {
        flex-direction: column;
        align-items: center;
        text-align: center;
        padding-top: 24px;
        border-top: 1px solid var(--qs-border);
    }

    .qs-footer__copyright {
        margin-bottom: 8px;
    }

    /* Section padding reduction */
    .qs-section {
        padding: 60px 0;
    }

    .qs-section__headline {
        font-size: 2rem;
    }

    .qs-section__subheadline {
        font-size: 1rem;
    }

    /* Pricing */
    .qs-pricing {
        padding: 60px 0;
    }

    .qs-pricing-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    /* Blog */
    .qs-blog-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    /* Docs */
    .qs-docs-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    /* Dashboard */
    .qs-dashboard__sidebar {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 280px;
        height: 100vh;
        z-index: 1100;
        background: var(--qs-bg-primary);
        transform: translateX(-100%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .qs-dashboard__sidebar.is-open {
        display: block;
        transform: translateX(0);
    }

    .qs-dashboard__sidebar-toggle {
        display: flex !important;
    }

    .qs-dashboard__content {
        margin-left: 0;
        padding: 16px;
    }

    .qs-dashboard__overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 1099;
    }

    .qs-dashboard__overlay.is-visible {
        display: block;
    }

    /* Breadcrumbs */
    .qs-breadcrumbs {
        flex-wrap: wrap;
        gap: 4px;
    }

    .qs-breadcrumbs__separator {
        display: none;
    }

    .qs-breadcrumbs__item:not(:last-child)::after {
        content: '/';
        margin-left: 8px;
        color: var(--qs-text-muted);
    }

    /* Tables */
    .qs-table-wrapper {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    /* Auth forms */
    .qs-auth-form {
        padding: 32px 24px;
    }
}

/* --------------------------------------------------------------------------
   480px — Mobile phones
   -------------------------------------------------------------------------- */
@media (max-width: 480px) {
    .qs-container {
        padding-left: 16px;
        padding-right: 16px;
    }

    /* Typography */
    .qs-hero__headline {
        font-size: 1.875rem;
        line-height: 1.2;
    }

    .qs-hero__subheadline {
        font-size: 1rem;
    }

    .qs-section__headline {
        font-size: 1.625rem;
    }

    .qs-features__headline,
    .qs-why__headline,
    .qs-exam__headline,
    .qs-subjects__headline,
    .qs-stats__headline,
    .qs-performers__headline,
    .qs-testimonials__headline,
    .qs-cta__headline,
    .qs-pricing__headline {
        font-size: 1.625rem;
    }

    .qs-footer__heading {
        font-size: 1rem;
    }

    /* Everything single column */
    .qs-features-grid {
        grid-template-columns: 1fr;
    }

    .qs-subjects-grid {
        grid-template-columns: 1fr;
    }

    .qs-stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .qs-stat-card__number {
        font-size: 1.75rem;
    }

    .qs-stat-card__label {
        font-size: 0.8125rem;
    }

    .qs-performers-grid {
        grid-template-columns: 1fr;
    }

    .qs-footer__grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .qs-footer__brand {
        grid-column: span 1;
    }

    .qs-pricing-grid {
        grid-template-columns: 1fr;
    }

    .qs-pricing-card {
        padding: 24px;
    }

    .qs-pricing-card__price {
        font-size: 2.25rem;
    }

    /* Buttons full width */
    .qs-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 100%;
        padding: 14px 24px;
    }

    .qs-hero__actions .qs-btn,
    .qs-cta__actions .qs-btn {
        max-width: 100%;
    }

    .qs-newsletter-form {
        flex-direction: column;
    }

    .qs-newsletter-form__input {
        width: 100%;
    }

    .qs-newsletter-form__btn {
        width: 100%;
    }

    /* Hero */
    .qs-hero {
        padding-top: 48px;
        padding-bottom: 32px;
    }

    .qs-hero__illustration {
        max-width: 280px;
    }

    /* Feature cards */
    .qs-feature-card {
        padding: 20px;
    }

    .qs-feature-card__icon {
        width: 40px;
        height: 40px;
        margin-bottom: 12px;
    }

    .qs-feature-card__title {
        font-size: 1rem;
    }

    .qs-feature-card__desc {
        font-size: 0.875rem;
    }

    /* Subject cards */
    .qs-subject-card {
        padding: 16px;
    }

    .qs-subject-card__icon {
        font-size: 1.5rem;
    }

    /* Exam cards */
    .qs-exam-card {
        padding: 20px;
    }

    .qs-exam-card__title {
        font-size: 1.125rem;
    }

    /* Testimonial cards */
    .qs-testimonial-card {
        padding: 24px;
    }

    .qs-testimonial-card__quote {
        font-size: 0.9375rem;
    }

    /* Performer cards */
    .qs-performer-card {
        padding: 20px;
    }

    /* Footer minimal padding */
    .qs-footer {
        padding: 32px 0 0;
    }

    .qs-footer__grid {
        gap: 20px;
    }

    .qs-footer__links {
        gap: 8px;
    }

    .qs-footer__link {
        font-size: 0.875rem;
    }

    .qs-footer__bottom {
        padding-top: 16px;
    }

    .qs-footer__copyright {
        font-size: 0.8125rem;
    }

    .qs-footer__legal {
        flex-wrap: wrap;
        justify-content: center;
        gap: 8px;
    }

    .qs-footer__legal a {
        font-size: 0.8125rem;
    }

    /* CTA */
    .qs-cta {
        padding: 40px 0;
    }

    .qs-cta__headline {
        font-size: 1.625rem;
    }

    .qs-cta__subheadline {
        font-size: 0.9375rem;
    }

    /* Section padding */
    .qs-section {
        padding: 48px 0;
    }

    .qs-features,
    .qs-why,
    .qs-exam,
    .qs-subjects,
    .qs-stats,
    .qs-performers,
    .qs-testimonials,
    .qs-pricing,
    .qs-blog {
        padding: 48px 0;
    }

    /* Nav mobile menu */
    .qs-mobile-menu {
        padding: 16px;
    }

    .qs-mobile-menu__link {
        font-size: 1.0625rem;
        padding: 12px 0;
    }

    .qs-mobile-menu__sub-link {
        font-size: 0.9375rem;
    }

    .qs-mobile-menu__cta {
        flex-direction: column;
    }

    .qs-mobile-menu__cta .qs-btn {
        width: 100%;
    }

    /* Auth */
    .qs-auth {
        padding: 32px 16px;
    }

    .qs-auth__headline {
        font-size: 1.5rem;
    }

    .qs-auth-form {
        padding: 24px 16px;
    }

    /* Dashboard */
    .qs-dashboard__content {
        padding: 12px;
    }

    .qs-dashboard__header {
        flex-wrap: wrap;
        gap: 12px;
    }

    .qs-dashboard__title {
        font-size: 1.375rem;
    }

    /* Tables */
    .qs-table {
        font-size: 0.8125rem;
    }

    .qs-table th,
    .qs-table td {
        padding: 10px 8px;
    }

    /* Search form */
    .qs-search-form {
        flex-direction: column;
    }

    .qs-search-form__input {
        width: 100%;
    }

    .qs-search-form__btn {
        width: 100%;
    }

    /* Tags */
    .qs-tags {
        gap: 6px;
    }

    .qs-tag {
        padding: 4px 10px;
        font-size: 0.75rem;
    }

    /* Modal */
    .qs-modal {
        width: calc(100% - 32px);
        max-height: calc(100vh - 64px);
        margin: 16px;
    }

    /* Breadcrumbs */
    .qs-breadcrumbs {
        font-size: 0.8125rem;
    }

    /* Tabs */
    .qs-tabs {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        white-space: nowrap;
    }

    .qs-tabs__item {
        padding: 8px 16px;
        font-size: 0.875rem;
    }

    /* Sidebar mobile */
    .qs-sidebar {
        width: 260px;
    }

    /* Blog list */
    .qs-blog-card__meta {
        flex-wrap: wrap;
        gap: 8px;
    }

    .qs-blog-card__title {
        font-size: 1.125rem;
    }

    .qs-blog-card__excerpt {
        font-size: 0.9375rem;
        display: -webkit-box;
        -webkit-line-clamp: 3;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    /* Pagination */
    .qs-pagination {
        gap: 4px;
    }

    .qs-pagination__item {
        width: 36px;
        height: 36px;
        font-size: 0.875rem;
    }

    /* Login/Register split */
    .qs-auth__split {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .qs-auth__split-visual {
        display: none;
    }

    /* Pricing toggle */
    .qs-pricing-toggle {
        flex-direction: column;
        gap: 8px;
    }

    .qs-pricing-card__features {
        gap: 10px;
    }

    .qs-pricing-card__feature {
        font-size: 0.875rem;
    }

    /* Comparison table */
    .qs-comparison {
        font-size: 0.8125rem;
    }

    /* Accordion / FAQ */
    .qs-accordion__trigger {
        font-size: 0.9375rem;
        padding: 16px;
    }

    .qs-accordion__content {
        padding: 0 16px 16px;
        font-size: 0.9375rem;
    }

    /* Steps */
    .qs-steps {
        flex-direction: column;
    }

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

    .qs-step__number {
        margin: 0 auto 16px;
    }

    /* Team */
    .qs-team-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .qs-team-card {
        text-align: center;
    }
}

/* --------------------------------------------------------------------------
   360px — Very small phones
   -------------------------------------------------------------------------- */
@media (max-width: 360px) {
    .qs-hero__headline {
        font-size: 1.625rem;
    }

    .qs-stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }

    .qs-stat-card {
        padding: 16px 12px;
    }

    .qs-stat-card__number {
        font-size: 1.5rem;
    }

    .qs-btn {
        padding: 12px 16px;
        font-size: 0.9375rem;
    }

    .qs-footer__grid {
        gap: 16px;
    }

    .qs-section {
        padding: 40px 0;
    }

    .qs-features,
    .qs-why,
    .qs-exam,
    .qs-subjects,
    .qs-stats,
    .qs-performers,
    .qs-testimonials,
    .qs-pricing {
        padding: 40px 0;
    }
}

/* --------------------------------------------------------------------------
   Print styles
   -------------------------------------------------------------------------- */
@media print {
    .qs-header,
    .qs-sidebar,
    .qs-sidebar-overlay,
    .qs-dashboard__sidebar-toggle,
    .qs-cta,
    .qs-footer,
    .qs-newsletter,
    .qs-mobile-menu,
    .qs-nav__hamburger,
    .qs-back-to-top {
        display: none !important;
    }

    body {
        font-size: 12pt;
        color: #000;
        background: #fff;
    }

    .qs-container {
        max-width: 100%;
        padding: 0;
    }

    a {
        text-decoration: underline;
        color: #000;
    }

    a[href]::after {
        content: ' (' attr(href) ')';
        font-size: 0.75em;
        color: #555;
    }

    a[href^="#"]::after,
    a[href^="javascript:"]::after {
        content: '';
    }
}

/* --------------------------------------------------------------------------
   Reduced motion — accessibility
   -------------------------------------------------------------------------- */
@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;
    }

    .qs-reveal {
        opacity: 1;
        transform: none;
    }

    .qs-hero__badge,
    .qs-hero__illustration {
        animation: none;
    }
}

/* --------------------------------------------------------------------------
   High contrast mode
   -------------------------------------------------------------------------- */
@media (forced-colors: active) {
    .qs-btn {
        border: 2px solid ButtonText;
    }

    .qs-card {
        border: 1px solid CanvasText;
    }

    .qs-input,
    .qs-textarea {
        border: 1px solid CanvasText;
    }
}