/* ==========================================================================
   UniFluent - collections

   The blog and resources index pages: filter chips, article cards, resource
   cards and the featured block. Depends on css/brand.css and css/pages.css.
   ========================================================================== */

.blog-content,
.section {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--uf-section) var(--uf-gutter);
}

/* --------------------------------------------------------------------------
   Filters
   -------------------------------------------------------------------------- */

.category-filters {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.6rem;
    margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.category-btn {
    padding: 0.55rem 1.15rem;
    border: 1px solid var(--uf-hairline);
    border-radius: 999px;
    background: rgba(206, 206, 215, 0.04);
    color: var(--uf-text-dim);
    font-family: var(--uf-sans);
    font-size: 0.86rem;
    font-weight: 500;
    cursor: pointer;
    transition: color 0.3s var(--uf-ease), background-color 0.3s var(--uf-ease),
                border-color 0.3s var(--uf-ease);
}

.category-btn:hover {
    color: var(--uf-text);
    border-color: rgba(206, 206, 215, 0.3);
}

.category-btn.active {
    background: var(--uf-paper);
    border-color: transparent;
    color: #101014;
}

/* --------------------------------------------------------------------------
   Blog stage — featured story (concept 01)
   Full-bleed edge-to-edge photo with copy over a left shade.
   -------------------------------------------------------------------------- */

.blog-stage {
    padding-top: 0;
    overflow: clip;
}

.blog-hero {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 100%;
    min-height: 100vh;
    min-height: 100dvh;
    padding: calc(4.6rem + 1rem) var(--uf-gutter) clamp(3.5rem, 8vw, 5.5rem);
    overflow: hidden;
    background: var(--uf-ink);
}

.blog-hero.is-compact {
    min-height: 0;
    padding-bottom: 1.25rem;
}

.blog-stage__bar {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0;
}

.blog-stage__filters {
    justify-content: flex-start;
    margin-bottom: 0;
    gap: 0.5rem;
}

.blog-stage__filters .category-btn {
    background: rgba(10, 10, 11, 0.45);
    border-color: rgba(206, 206, 215, 0.28);
    color: rgba(244, 244, 247, 0.88);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.blog-stage__filters .category-btn:hover {
    color: #fff;
    border-color: rgba(206, 206, 215, 0.45);
}

.blog-stage__filters .category-btn.active {
    background: var(--uf-indigo);
    border-color: transparent;
    color: #fff;
}

.blog-feature {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 1200px;
    margin: auto auto 0;
    padding: 0;
}

.blog-feature.is-hidden,
.blog-card.is-hidden {
    display: none !important;
}

.blog-feature__photo {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.blog-feature__photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transform: scale(1.03);
    transition: transform 1.4s var(--uf-ease), opacity 0.45s var(--uf-ease);
}

.blog-hero:hover .blog-feature__photo img {
    transform: scale(1.07);
}

.blog-hero.is-compact .blog-feature__photo,
.blog-hero.is-compact .blog-feature__shade {
    opacity: 0;
    visibility: hidden;
}

.blog-feature__shade {
    position: absolute;
    inset: 0;
    z-index: 1;
    background:
        linear-gradient(90deg, rgba(10, 10, 11, 0.92) 0%, rgba(10, 10, 11, 0.72) 38%, rgba(10, 10, 11, 0.28) 68%, rgba(10, 10, 11, 0.12) 100%),
        linear-gradient(180deg, rgba(10, 10, 11, 0.45) 0%, transparent 30%, rgba(10, 10, 11, 0.55) 100%);
    pointer-events: none;
    transition: opacity 0.45s var(--uf-ease);
}

.blog-feature__copy {
    position: relative;
    z-index: 2;
    max-width: 36rem;
}

.blog-feature__eyebrow {
    margin: 0 0 1rem;
    color: var(--uf-lime);
    font-family: var(--uf-sans);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.blog-feature h1 {
    margin: 0 0 1.15rem;
    font-size: clamp(2.5rem, 5.6vw, 4.4rem);
    line-height: 1.04;
    letter-spacing: -0.03em;
    color: #fff;
    text-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

.blog-feature__dek {
    margin: 0 0 1.75rem;
    max-width: 28rem;
    color: rgba(244, 244, 247, 0.78);
    font-size: clamp(1rem, 1.5vw, 1.12rem);
    line-height: 1.55;
}

.blog-feature__cta {
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.9rem 1.45rem;
    border-radius: 999px;
    background: var(--uf-lime);
    color: #101014;
    font-family: var(--uf-sans);
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.35s var(--uf-ease), background-color 0.3s var(--uf-ease);
}

.blog-feature__cta:hover {
    transform: translateY(-2px);
    background: #d6f97a;
}

.blog-feature__cta i {
    font-size: 0.8em;
    transition: transform 0.35s var(--uf-ease);
}

.blog-feature__cta:hover i {
    transform: translateX(4px);
}

.blog-rail {
    max-width: 1200px;
    margin: 0 auto;
    padding: clamp(2.75rem, 5vw, 4rem) var(--uf-gutter) clamp(4rem, 8vw, 6.5rem);
}

.blog-rail__grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(1.25rem, 2.5vw, 2rem);
}

.blog-card--quiet {
    background: transparent;
    border: 0;
    border-radius: 0;
    overflow: visible;
}

.blog-card--quiet:hover {
    transform: none;
}

.blog-card__link {
    display: flex;
    flex-direction: column;
    color: inherit;
    text-decoration: none;
}

.blog-card--quiet .blog-card-image {
    border-radius: var(--uf-radius-sm);
    border: 1px solid var(--uf-hairline-soft);
}

.blog-card--quiet .blog-card-content {
    padding: 1.15rem 0 0;
}

.blog-card--quiet .blog-card-category {
    margin-bottom: 0.65rem;
    padding: 0;
    border-radius: 0;
    background: none;
    color: var(--uf-indigo-soft);
    letter-spacing: 0.12em;
}

.blog-card--quiet h2 {
    margin: 0 0 0.85rem;
    font-size: clamp(1.15rem, 1.8vw, 1.35rem);
    line-height: 1.25;
    color: var(--uf-text);
    transition: color 0.3s var(--uf-ease);
}

.blog-card--quiet:hover h2 {
    color: var(--uf-indigo-soft);
}

.blog-card--quiet .blog-card-meta {
    margin: 0;
    padding: 0;
    border: 0;
    justify-content: flex-start;
}

/* Entry motion */
@media (prefers-reduced-motion: no-preference) {
    .blog-feature__photo img {
        opacity: 0;
        transition: opacity 0.9s var(--uf-ease), transform 1.4s var(--uf-ease);
    }

    .blog-feature__copy,
    .blog-rail .blog-card {
        opacity: 0;
        transform: translateY(18px);
        transition: opacity 0.75s var(--uf-ease), transform 0.75s var(--uf-ease);
    }

    .blog-stage.is-ready .blog-feature__photo img,
    .blog-stage.is-ready .blog-feature__copy,
    .blog-stage.is-ready .blog-rail .blog-card {
        opacity: 1;
        transform: none;
    }

    .blog-stage.is-ready .blog-feature__copy {
        transition-delay: 0.14s;
    }

    .blog-stage.is-ready .blog-rail .blog-card:nth-child(1) { transition-delay: 0.22s; }
    .blog-stage.is-ready .blog-rail .blog-card:nth-child(2) { transition-delay: 0.32s; }
    .blog-stage.is-ready .blog-rail .blog-card:nth-child(3) { transition-delay: 0.42s; }
}

/* --------------------------------------------------------------------------
   Article cards
   -------------------------------------------------------------------------- */

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: clamp(1.25rem, 2vw, 2rem);
}

.blog-card {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--uf-ink-panel);
    border: 1px solid var(--uf-hairline-soft);
    border-radius: var(--uf-radius);
    transition: transform 0.4s var(--uf-ease), border-color 0.4s var(--uf-ease);
}

.blog-card:hover {
    transform: translateY(-5px);
    border-color: var(--uf-hairline);
}

.blog-card-image {
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: var(--uf-ink-raised);
}

.blog-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    /* Photography is the one place the site allows full colour, so hold it
       back a little until the card is hovered. */
    opacity: 0.82;
    transition: transform 0.6s var(--uf-ease), opacity 0.4s var(--uf-ease);
}

.blog-card:hover .blog-card-image img {
    transform: scale(1.04);
    opacity: 1;
}

.blog-card-content {
    display: flex;
    flex-direction: column;
    flex: 1;
    padding: clamp(1.3rem, 2vw, 1.75rem);
}

.blog-card-category,
.card-category {
    display: inline-block;
    align-self: flex-start;
    margin-bottom: 1rem;
    padding: 0.28rem 0.7rem;
    border-radius: 999px;
    background: rgba(85, 87, 232, 0.14);
    color: var(--uf-indigo-soft);
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.blog-card h3 {
    margin: 0 0 0.75rem;
    font-size: 1.2rem;
    line-height: 1.25;
}

.blog-card h3 a {
    color: var(--uf-text);
    text-decoration: none;
    transition: color 0.3s var(--uf-ease);
}

.blog-card h3 a:hover {
    color: var(--uf-indigo-soft);
}

.blog-card-content > p {
    margin: 0 0 1.5rem;
    color: var(--uf-text-dim);
    font-size: 0.92rem;
}

.blog-card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-top: auto;
    padding-top: 1.1rem;
    border-top: 1px solid var(--uf-hairline-soft);
    color: var(--uf-text-faint);
    font-size: 0.82rem;
}

.read-more {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    color: var(--uf-indigo-soft);
    font-weight: 600;
    text-decoration: none;
}

.read-more i {
    transition: transform 0.3s var(--uf-ease);
}

.blog-card:hover .read-more i {
    transform: translateX(4px);
}

/* --------------------------------------------------------------------------
   Featured resource
   -------------------------------------------------------------------------- */

.featured-resource {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: center;
    margin-bottom: clamp(3.5rem, 6vw, 5.5rem);
    padding: clamp(1.75rem, 3.5vw, 3rem);
    border: 1px solid rgba(85, 87, 232, 0.34);
    border-radius: var(--uf-radius);
    background:
        radial-gradient(90% 120% at 0% 0%, rgba(85, 87, 232, 0.18), transparent 60%),
        var(--uf-ink-panel);
}

.featured-content h3 {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: clamp(1.5rem, 2.8vw, 2.1rem);
}

.featured-content h3 i {
    color: var(--uf-indigo-soft);
    font-size: 0.8em;
}

.featured-content > p {
    margin: 1rem 0 0;
    color: var(--uf-text-dim);
}

.featured-stats {
    display: flex;
    gap: clamp(1.5rem, 3vw, 2.5rem);
    margin: 1.75rem 0;
}

.stat-number {
    font-family: var(--uf-serif);
    font-size: 1.9rem;
    line-height: 1;
}

.stat-label {
    margin-top: 0.35rem;
    color: var(--uf-text-faint);
    font-size: 0.76rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.btn-featured {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.95rem 1.7rem;
    border-radius: 999px;
    background: var(--uf-paper);
    color: #101014;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.3s var(--uf-ease), background-color 0.3s var(--uf-ease),
                box-shadow 0.3s var(--uf-ease);
}

.btn-featured:hover {
    transform: translateY(-2px);
    background: #fff;
    box-shadow: 0 14px 34px rgba(0, 0, 0, 0.45);
}

.quiz-preview {
    padding: 1.5rem;
    border: 1px solid var(--uf-hairline);
    border-radius: var(--uf-radius-sm);
    background: rgba(10, 10, 11, 0.6);
}

.quiz-preview h4 {
    margin: 0 0 0.4rem;
    font-family: var(--uf-sans);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--uf-text-faint);
}

.quiz-preview > p {
    color: var(--uf-text-dim);
}

.quiz-option {
    margin-top: 0.55rem;
    padding: 0.7rem 0.95rem;
    border: 1px solid var(--uf-hairline-soft);
    border-radius: 10px;
    color: var(--uf-text-dim);
    font-size: 0.88rem;
    cursor: pointer;
    transition: border-color 0.3s var(--uf-ease), color 0.3s var(--uf-ease),
                background-color 0.3s var(--uf-ease);
}

.quiz-option:hover {
    border-color: rgba(85, 87, 232, 0.5);
    background: rgba(85, 87, 232, 0.08);
    color: var(--uf-text);
}

/* --------------------------------------------------------------------------
   Resource cards
   -------------------------------------------------------------------------- */

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: clamp(1.25rem, 2vw, 2rem);
}

.resource-card {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--uf-ink-panel);
    border: 1px solid var(--uf-hairline-soft);
    border-radius: var(--uf-radius);
    transition: transform 0.4s var(--uf-ease), border-color 0.4s var(--uf-ease);
}

.resource-card:hover {
    transform: translateY(-5px);
    border-color: var(--uf-hairline);
}

/* Each family of resources keeps its own hue, but as a wash over the dark
   panel rather than as a solid block of colour. */
.card-header {
    position: relative;
    padding: clamp(1.4rem, 2.4vw, 1.9rem);
    border-bottom: 1px solid var(--uf-hairline-soft);
}

.card-header::before {
    content: '';
    position: absolute;
    inset: 0;
    opacity: 0.5;
    pointer-events: none;
}

.card-header > * {
    position: relative;
    z-index: 1;
}

.card-header.getting-started::before {
    background: linear-gradient(135deg, rgba(85, 87, 232, 0.3), transparent 70%);
}

.card-header.academic::before {
    background: linear-gradient(135deg, rgba(123, 63, 168, 0.3), transparent 70%);
}

.card-header.language::before {
    background: linear-gradient(135deg, rgba(200, 244, 93, 0.16), transparent 70%);
}

.card-header.life::before {
    background: linear-gradient(135deg, rgba(139, 141, 255, 0.26), transparent 70%);
}

.card-header h3 {
    margin: 0 0 0.5rem;
    font-size: 1.25rem;
}

.card-header p {
    margin: 0;
    color: var(--uf-text-dim);
    font-size: 0.9rem;
}

.card-body {
    display: flex;
    flex-direction: column;
    flex: 1;
    padding: clamp(1.4rem, 2.4vw, 1.9rem);
}

.card-features {
    margin: 0 0 1.5rem;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 0.65rem;
}

.card-features li {
    display: flex;
    align-items: flex-start;
    gap: 0.65rem;
    color: var(--uf-text-dim);
    font-size: 0.9rem;
}

.card-features li i {
    margin-top: 0.28rem;
    font-size: 0.7rem;
    color: var(--uf-lime);
}

.card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
    color: var(--uf-text-faint);
    font-size: 0.8rem;
}

.btn-card {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.55rem;
    margin-top: auto;
    padding: 0.8rem 1.4rem;
    border: 1px solid var(--uf-hairline);
    border-radius: 999px;
    background: rgba(206, 206, 215, 0.06);
    color: var(--uf-text);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.3s var(--uf-ease), background-color 0.3s var(--uf-ease),
                border-color 0.3s var(--uf-ease);
}

.btn-card:hover {
    transform: translateY(-2px);
    background: rgba(206, 206, 215, 0.13);
    border-color: rgba(206, 206, 215, 0.3);
}

/* --------------------------------------------------------------------------
   Closing call to action
   -------------------------------------------------------------------------- */

.cta-section {
    padding: var(--uf-section) var(--uf-gutter);
    text-align: center;
    border-top: 1px solid var(--uf-hairline-soft);
    background: radial-gradient(60% 70% at 50% 100%, rgba(85, 87, 232, 0.18), transparent 70%);
}

.cta-section h2 {
    font-size: clamp(2rem, 4.2vw, 3.2rem);
}

.cta-section p {
    max-width: 38rem;
    margin: 1.1rem auto 2rem;
    color: var(--uf-text-dim);
}

.cta-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.9rem;
    justify-content: center;
}

/* These pages predate the .uf-btn family; keep their class names working. */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    padding: 0.95rem 1.7rem;
    border: 1px solid transparent;
    border-radius: 999px;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.3s var(--uf-ease), background-color 0.3s var(--uf-ease),
                border-color 0.3s var(--uf-ease);
}

.btn-white {
    background: var(--uf-paper);
    color: #101014;
}

.btn-outline {
    background: rgba(206, 206, 215, 0.06);
    border-color: var(--uf-hairline);
    color: var(--uf-text);
}

.btn:hover {
    transform: translateY(-2px);
}

.btn-white:hover {
    background: #fff;
}

.btn-outline:hover {
    background: rgba(206, 206, 215, 0.13);
    border-color: rgba(206, 206, 215, 0.3);
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */

@media (max-width: 960px) {
    .blog-hero {
        min-height: 100svh;
        padding-bottom: clamp(2.5rem, 8vw, 4rem);
    }

    .blog-feature__shade {
        background:
            linear-gradient(180deg, rgba(10, 10, 11, 0.42) 0%, rgba(10, 10, 11, 0.5) 40%, rgba(10, 10, 11, 0.92) 100%);
    }

    .blog-rail__grid {
        grid-template-columns: 1fr;
        max-width: 420px;
    }
}

@media (max-width: 860px) {
    .featured-resource {
        grid-template-columns: 1fr;
    }

    .blog-stage__filters {
        justify-content: flex-start;
    }
}