:root {
    --mc-shell-max: 1480px;
    --mc-shell-half: 740px;
    --mc-content-max: 1480px;
    --mc-sidebar-width: 280px;
    --mc-layout-gap: clamp(28px, 4vw, 56px);
    --mc-page-pad: clamp(20px, 5vw, 72px);
    --mc-mobile-pad: 18px;
    --mc-card-min: 0;
    --mc-nav-height: 80px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html,
body {
    width: 100%;
    max-width: 100%;
}

html {
    scroll-padding-top: calc(var(--mc-nav-height) + 24px);
}

img,
svg,
canvas,
video,
iframe {
    max-width: 100%;
}

.nav {
    display: grid !important;
    grid-template-columns: minmax(0, var(--mc-content-max));
    justify-content: center;
    padding-left: var(--mc-page-pad) !important;
    padding-right: var(--mc-page-pad) !important;
    min-height: var(--mc-nav-height) !important;
    height: var(--mc-nav-height) !important;
    align-items: center !important;
}

body > nav:not(#main-nav):not(.nav):not(#sidebar-toc):not(#editorial-outline) {
    display: grid !important;
    grid-template-columns: minmax(0, var(--mc-content-max));
    justify-content: center;
    padding-left: var(--mc-page-pad) !important;
    padding-right: var(--mc-page-pad) !important;
    min-height: var(--mc-nav-height) !important;
    height: var(--mc-nav-height) !important;
    align-items: center !important;
}

.nav > .brand,
body > nav:not(#main-nav):not(.nav):not(#sidebar-toc):not(#editorial-outline) > .logo {
    grid-column: 1;
    grid-row: 1;
    justify-self: start;
    align-self: center;
}

.nav > div,
body > nav:not(#main-nav):not(.nav):not(#sidebar-toc):not(#editorial-outline) > .links {
    grid-column: 1;
    grid-row: 1;
    justify-self: end;
    align-self: center;
    display: flex !important;
    align-items: center !important;
    justify-content: flex-end !important;
    gap: 18px !important;
    flex-wrap: nowrap !important;
    min-width: 0;
    max-width: calc(100vw - 220px);
    overflow-x: auto;
    scrollbar-width: none;
}

.nav > div::-webkit-scrollbar,
body > nav:not(#main-nav):not(.nav):not(#sidebar-toc):not(#editorial-outline) > .links::-webkit-scrollbar {
    display: none;
}

.nav a,
.nav button,
body > nav:not(#main-nav):not(.nav):not(#sidebar-toc):not(#editorial-outline) a,
body > nav:not(#main-nav):not(.nav):not(#sidebar-toc):not(#editorial-outline) button,
#main-nav .nav-links a,
#main-nav .nav-links button {
    white-space: nowrap;
}

.nav > .brand,
body > nav:not(#main-nav):not(.nav):not(#sidebar-toc):not(#editorial-outline) > .logo,
#main-nav .logo {
    white-space: nowrap;
}

body > main:not(#main-content) {
    width: calc(100% - var(--mc-page-pad) - var(--mc-page-pad));
    max-width: var(--mc-content-max) !important;
    margin-left: auto !important;
    margin-right: auto !important;
    padding-left: 0 !important;
    padding-right: 0 !important;
}

body > main:not(#main-content) > :where(section, div) {
    max-width: 100%;
    scroll-margin-top: calc(var(--mc-nav-height) + 24px);
}

body > :where(section, footer, main, .hero, .section-header, .trainers, .featured, .course-list, .experts-inner),
[id] {
    scroll-margin-top: calc(var(--mc-nav-height) + 24px);
}

body > :where(.hero, .section-header, .trainers, .featured, .course-list, .experts-inner) {
    max-width: var(--mc-shell-max);
}

.grid,
.profile-grid,
.stats,
.cert-card,
.card,
.profile-card,
.section,
.toolbar {
    min-width: 0;
}

.card,
.profile-card,
.cert-card,
.empty,
.verify-card,
.soft-marketing {
    width: 100%;
}

.card,
.cert-card {
    min-height: var(--mc-card-min);
}

#main-nav-inner,
#sticky-progress-inner,
.editorial-reading-strip-inner,
.editorial-page {
    max-width: var(--mc-shell-max) !important;
    margin-left: auto !important;
    margin-right: auto !important;
    padding-left: var(--mc-page-pad) !important;
    padding-right: var(--mc-page-pad) !important;
}

#main-nav-inner {
    width: 100%;
    min-height: var(--mc-nav-height) !important;
    height: var(--mc-nav-height) !important;
    padding-top: 0 !important;
    padding-bottom: 0 !important;
}

.editorial-shell-active #main-content {
    width: 100% !important;
    max-width: none !important;
    margin-left: 0 !important;
    margin-right: 0 !important;
    padding-left: 0 !important;
    padding-right: 0 !important;
}

.editorial-premium-layout {
    grid-template-columns: minmax(0, 1fr) minmax(248px, var(--mc-sidebar-width)) !important;
    gap: var(--mc-layout-gap) !important;
}

.editorial-main-column,
.editorial-sections,
.editorial-section-card,
.editorial-content,
.intro-card,
.cert-readiness-card,
.team-card,
.quiz-card,
.premium-footer {
    width: 100%;
    max-width: 100%;
    min-width: 0;
}

.outline {
    width: 100% !important;
    max-width: var(--mc-sidebar-width) !important;
    position: sticky !important;
    top: 96px !important;
    max-height: calc(100vh - 116px);
    overflow-y: auto;
    overscroll-behavior: contain;
    scrollbar-width: thin;
}

@media (min-width: 1181px) {
    .editorial-shell-active .outline {
        position: sticky !important;
        top: 104px !important;
        right: auto !important;
        width: 100% !important;
        max-height: calc(100vh - 124px) !important;
        overflow-y: auto !important;
        z-index: 10;
    }
}

.editorial-section-card {
    min-height: clamp(0px, var(--mc-card-min), 720px);
}

.section-head,
.section-prelude,
.editorial-content,
.editorial-section-actions,
.completion-grid,
.quiz-stage-grid {
    min-width: 0;
}

.section-nav-row,
.editorial-section-actions {
    max-width: 100%;
}

.flashcard-block {
    margin: 1.35rem 0;
}

.flashcard-block-title {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 14px;
    color: var(--text, var(--text-primary, #0f172a));
    font-size: 17px;
    font-weight: 800;
    letter-spacing: -0.01em;
}

.flashcard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 14px;
}

.flashcard-container {
    min-height: 210px;
    perspective: 900px;
    cursor: pointer;
    outline: none;
}

.flashcard-container:focus-visible .flashcard-front,
.flashcard-container:focus-visible .flashcard-back {
    border-color: rgba(193, 18, 31, 0.34);
    box-shadow: 0 0 0 3px rgba(193, 18, 31, 0.12), 0 18px 38px rgba(15, 23, 42, 0.08);
}

.flashcard-inner {
    position: relative;
    display: block;
    width: 100%;
    min-height: 210px;
    transition: transform .48s cubic-bezier(.4, .2, .2, 1);
    transform-style: preserve-3d;
}

.flashcard-inner.flipped {
    transform: rotateY(180deg);
}

.flashcard-front,
.flashcard-back {
    position: absolute;
    inset: 0;
    min-height: 210px;
    backface-visibility: hidden;
    border-radius: 18px;
    padding: 26px 60px 26px 26px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-align: left;
    overflow: hidden;
    border: 1px solid var(--border, #e2e8f0);
    background: linear-gradient(145deg, #fff 0%, #f8fafc 100%);
    box-shadow: 0 16px 34px rgba(15, 23, 42, 0.06);
}

.flashcard-front::after,
.flashcard-back::after {
    content: "";
    position: absolute;
    right: -40px;
    bottom: -52px;
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background: rgba(193, 18, 31, 0.045);
    pointer-events: none;
}

.flashcard-back {
    transform: rotateY(180deg);
    background: linear-gradient(145deg, #ffffff 0%, #f4f7fb 100%);
}

.flashcard-mark {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 32px;
    height: 32px;
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: rgba(193, 18, 31, 0.07);
    border: 1px solid rgba(193, 18, 31, 0.18);
    color: #c1121f;
    font-size: 13px;
    font-weight: 900;
    line-height: 1;
    z-index: 1;
}

.flashcard-title {
    margin: 0;
    color: var(--text, var(--text-primary, #0f172a));
    font-size: 18px;
    line-height: 1.3;
    font-weight: 800;
}

.flashcard-hint {
    margin: 12px 0 0;
    color: var(--text-muted, #64748b);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.flashcard-answer {
    margin: 0;
    color: var(--text-secondary, #475569);
    font-size: 16px;
    line-height: 1.55;
    font-weight: 500;
}

.btn-mark-read,
.btn-sec-nav,
.btn,
.premium-btn-primary,
.premium-btn-secondary {
    min-height: 42px;
}

@media (min-width: 1024px) {
    #sidebar-toc {
        right: max(var(--mc-page-pad), calc(50vw - var(--mc-shell-half) + var(--mc-page-pad))) !important;
    }

    body:not(.editorial-shell-active) #main-content {
        margin-left: max(var(--mc-page-pad), calc(50vw - var(--mc-shell-half) + var(--mc-page-pad))) !important;
        margin-right: max(calc(var(--mc-page-pad) + var(--mc-sidebar-width) + 32px), calc(50vw - var(--mc-shell-half) + var(--mc-page-pad) + var(--mc-sidebar-width) + 32px)) !important;
    }
}

@media (max-width: 1180px) {
    .outline {
        max-width: 100% !important;
        position: sticky !important;
        top: 88px !important;
        max-height: min(420px, calc(100vh - 108px)) !important;
        overflow-y: auto !important;
    }
}

@media (max-width: 900px) {
    :root {
        --mc-page-pad: var(--mc-mobile-pad);
        --mc-layout-gap: 24px;
    }

    .nav {
        min-height: 72px;
        gap: 14px;
    }

    .nav > div {
        gap: 12px !important;
        flex-wrap: wrap;
        justify-content: flex-end;
    }

    body > nav:not(#main-nav):not(.nav):not(#sidebar-toc):not(#editorial-outline) > .links {
        gap: 16px !important;
        flex-wrap: wrap;
        justify-content: flex-end;
    }

    body > main:not(#main-content) {
        width: calc(100% - var(--mc-page-pad) - var(--mc-page-pad));
        padding-top: 34px !important;
        padding-bottom: 64px !important;
    }

    .editorial-premium-layout {
        grid-template-columns: 1fr !important;
    }

    .outline {
        max-width: 100% !important;
        position: static !important;
        top: auto !important;
        max-height: none !important;
        overflow: visible !important;
    }
}

@media (max-width: 560px) {
    :root {
        --mc-mobile-pad: 16px;
    }

    .nav {
        align-items: flex-start;
        grid-template-columns: minmax(0, 1fr);
        justify-content: stretch;
        padding-top: 14px !important;
        padding-bottom: 14px !important;
        height: auto !important;
    }

    body > nav:not(#main-nav):not(.nav):not(#sidebar-toc):not(#editorial-outline) {
        grid-template-columns: minmax(0, 1fr);
        justify-content: stretch;
        gap: 12px;
        padding-top: 14px !important;
        padding-bottom: 14px !important;
        min-height: 0 !important;
        height: auto !important;
    }

    .nav > .brand,
    .nav > div,
    body > nav:not(#main-nav):not(.nav):not(#sidebar-toc):not(#editorial-outline) > .logo,
    body > nav:not(#main-nav):not(.nav):not(#sidebar-toc):not(#editorial-outline) > .links {
        grid-column: 1;
        grid-row: auto;
        justify-self: start;
    }

    .nav > div {
        width: 100%;
        max-width: 100%;
        gap: 4px !important;
        flex-wrap: wrap !important;
        justify-content: flex-start !important;
        overflow: visible;
    }

    body > nav:not(#main-nav):not(.nav):not(#sidebar-toc):not(#editorial-outline) > .links {
        width: 100%;
        max-width: 100%;
        gap: 4px !important;
        flex-wrap: wrap !important;
        justify-content: flex-start !important;
        overflow: visible;
    }

    body > main:not(#main-content) {
        width: calc(100% - 32px);
    }

    .profile-card,
    .card,
    .cert-card,
    .empty {
        border-radius: 20px !important;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto !important;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}