/* =========================================================
   Category Catalog — Modern Redesign
   ========================================================= */

.cat-page {
    --cat-surface: #f4f7fb;
    --cat-card: #ffffff;
    --cat-text: #0f172a;
    --cat-muted: #64748b;
    --cat-border: rgba(15, 23, 42, 0.08);
    --cat-radius: 20px;
    --cat-radius-sm: 14px;
    --cat-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
    --cat-shadow-hover: 0 18px 42px rgba(15, 23, 42, 0.12);
    --cat-ease: cubic-bezier(0.22, 1, 0.36, 1);
    --cat-accent-rgb: var(--c-accent-rgb, 0, 156, 204);
    --cat-accent: rgb(var(--cat-accent-rgb));
    position: relative;
    overflow: hidden;
    padding: 2.25rem 0 3.5rem;
    background:
        radial-gradient(900px 420px at 100% -10%, rgba(var(--cat-accent-rgb), 0.14), transparent 55%),
        radial-gradient(700px 380px at 0% 20%, rgba(var(--c-secondary-rgb, 51, 65, 85), 0.08), transparent 50%),
        linear-gradient(180deg, #eef3f8 0%, var(--cat-surface) 38%, #ffffff 100%);
    color: var(--cat-text);
}

.cat-page__glow {
    position: absolute;
    inset: auto;
    width: 280px;
    height: 280px;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.35;
    pointer-events: none;
    z-index: 0;
}

.cat-page__glow--1 {
    top: 8%;
    left: -6%;
    background: rgba(var(--cat-accent-rgb), 0.35);
}

.cat-page__glow--2 {
    top: 42%;
    right: -8%;
    background: rgba(var(--c-secondary-rgb, 51, 65, 85), 0.2);
}

.cat-page > .container {
    position: relative;
    z-index: 1;
}

/* ---------- Masthead (compact, not a marketing hero) ---------- */
.cat-masthead {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 1.25rem 1.5rem;
    align-items: center;
    margin-bottom: 1.5rem;
    animation: cat-rise 0.55s var(--cat-ease) both;
}

.cat-masthead__media {
    width: 96px;
    height: 96px;
    border-radius: 22px;
    overflow: hidden;
    background: var(--cat-card);
    border: 1px solid var(--cat-border);
    box-shadow: var(--cat-shadow);
    flex-shrink: 0;
}

.cat-masthead__media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.cat-masthead__media--fallback {
    display: grid;
    place-items: center;
    color: #fff;
    background: linear-gradient(
        145deg,
        rgb(var(--cat-accent-rgb)),
        rgb(var(--c-accent-hover-rgb, var(--cat-accent-rgb)))
    );
}

.cat-masthead__media--fallback svg {
    width: 36px;
    height: 36px;
}

.cat-masthead__eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    margin: 0 0 0.45rem;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--cat-accent);
}

.cat-masthead__title {
    margin: 0 0 0.45rem;
    font-size: clamp(1.55rem, 2.6vw, 2.15rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.2;
    color: var(--cat-text);
}

.cat-masthead__desc {
    margin: 0;
    max-width: 40rem;
    color: var(--cat-muted);
    font-size: 0.98rem;
    line-height: 1.65;
}

.cat-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    animation: cat-rise 0.55s var(--cat-ease) 0.08s both;
}

.cat-stat {
    background: rgba(255, 255, 255, 0.82);
    border: 1px solid var(--cat-border);
    border-radius: var(--cat-radius-sm);
    padding: 0.95rem 1.05rem;
    box-shadow: var(--cat-shadow);
    backdrop-filter: blur(8px);
}

.cat-stat__label {
    display: block;
    margin-bottom: 0.25rem;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--cat-muted);
}

.cat-stat__value {
    display: block;
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--cat-text);
}

.cat-stat--accent .cat-stat__value {
    color: var(--cat-accent);
}

/* ---------- Sticky subcategory nav ---------- */
.cat-nav-wrap {
    position: sticky;
    top: 0.75rem;
    z-index: 20;
    margin-bottom: 1.5rem;
    animation: cat-rise 0.55s var(--cat-ease) 0.14s both;
}

.cat-nav {
    display: flex;
    gap: 0.55rem;
    overflow-x: auto;
    padding: 0.55rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid var(--cat-border);
    box-shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
    backdrop-filter: blur(12px);
    scrollbar-width: none;
}

.cat-nav::-webkit-scrollbar {
    display: none;
}

.cat-nav__btn {
    appearance: none;
    border: 0;
    background: transparent;
    color: var(--cat-muted);
    white-space: nowrap;
    border-radius: 999px;
    padding: 0.65rem 1.05rem;
    font-size: 0.9rem;
    font-weight: 700;
    line-height: 1;
    cursor: pointer;
    transition: background 0.2s var(--cat-ease), color 0.2s var(--cat-ease), transform 0.2s var(--cat-ease);
}

.cat-nav__btn:hover {
    color: var(--cat-text);
    background: rgba(var(--cat-accent-rgb), 0.08);
}

.cat-nav__btn.is-active,
.cat-nav__btn[aria-selected="true"] {
    color: #fff;
    background: linear-gradient(
        135deg,
        rgb(var(--cat-accent-rgb)),
        rgb(var(--c-accent-hover-rgb, var(--cat-accent-rgb)))
    );
    box-shadow: 0 8px 18px rgba(var(--cat-accent-rgb), 0.28);
}

.cat-nav__count {
    display: inline-grid;
    place-items: center;
    min-width: 1.35rem;
    height: 1.35rem;
    margin-inline-start: 0.35rem;
    padding: 0 0.3rem;
    border-radius: 999px;
    font-size: 0.72rem;
    background: rgba(15, 23, 42, 0.08);
    color: inherit;
}

.cat-nav__btn.is-active .cat-nav__count,
.cat-nav__btn[aria-selected="true"] .cat-nav__count {
    background: rgba(255, 255, 255, 0.22);
}

/* ---------- Panels ---------- */
.cat-panel {
    display: none;
    animation: cat-rise 0.4s var(--cat-ease) both;
}

.cat-panel.is-active {
    display: block;
}

.cat-panel__head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
}

.cat-panel__title {
    margin: 0;
    font-size: 1.15rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.cat-panel__meta {
    margin: 0;
    color: var(--cat-muted);
    font-size: 0.88rem;
    font-weight: 600;
}

/* ---------- Course grid ---------- */
.cat-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.15rem;
}

.cat-card {
    display: flex;
    flex-direction: column;
    height: 100%;
    background: var(--cat-card);
    border: 1px solid var(--cat-border);
    border-radius: var(--cat-radius);
    overflow: hidden;
    box-shadow: var(--cat-shadow);
    transition: transform 0.28s var(--cat-ease), box-shadow 0.28s var(--cat-ease), border-color 0.28s var(--cat-ease);
}

.cat-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--cat-shadow-hover);
    border-color: rgba(var(--cat-accent-rgb), 0.22);
}

.cat-card__media {
    position: relative;
    aspect-ratio: 16 / 10;
    overflow: hidden;
    background: #e2e8f0;
}

.cat-card__media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.45s var(--cat-ease);
}

.cat-card:hover .cat-card__media img {
    transform: scale(1.05);
}

.cat-card__badge {
    position: absolute;
    top: 0.75rem;
    inset-inline-start: 0.75rem;
    z-index: 1;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.35rem 0.65rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 800;
    color: #fff;
    background: rgba(15, 23, 42, 0.78);
    backdrop-filter: blur(6px);
}

.cat-card__badge--free {
    background: rgba(16, 185, 129, 0.92);
}

.cat-card__badge--enrolled {
    background: rgba(var(--cat-accent-rgb), 0.95);
}

.cat-card__badge--sale {
    background: rgba(225, 29, 72, 0.92);
}

.cat-card__body {
    display: flex;
    flex-direction: column;
    flex: 1;
    padding: 1rem 1.05rem 1.1rem;
    gap: 0.65rem;
}

.cat-card__title {
    margin: 0;
    font-size: 1.02rem;
    font-weight: 800;
    line-height: 1.4;
    letter-spacing: -0.01em;
}

.cat-card__title a {
    color: inherit;
    text-decoration: none;
}

.cat-card__title a:hover {
    color: var(--cat-accent);
}

.cat-card__excerpt {
    margin: 0;
    color: var(--cat-muted);
    font-size: 0.86rem;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 2.75em;
}

.cat-card__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem 0.85rem;
    margin-top: auto;
    padding-top: 0.15rem;
    color: var(--cat-muted);
    font-size: 0.78rem;
    font-weight: 600;
}

.cat-card__meta span {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.cat-card__meta svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

.cat-card__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    margin-top: 0.35rem;
    padding-top: 0.85rem;
    border-top: 1px solid var(--cat-border);
}

.cat-card__price {
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
    min-width: 0;
}

.cat-card__price-now {
    font-size: 1.05rem;
    font-weight: 800;
    color: var(--cat-accent);
    letter-spacing: -0.02em;
}

.cat-card__price-old {
    font-size: 0.78rem;
    color: var(--cat-muted);
    text-decoration: line-through;
}

.cat-card__price-free {
    font-size: 1rem;
    font-weight: 800;
    color: #059669;
}

.cat-btn {
    appearance: none;
    border: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    min-height: 42px;
    padding: 0.55rem 0.95rem;
    border-radius: 12px;
    font-size: 0.86rem;
    font-weight: 800;
    line-height: 1;
    cursor: pointer;
    text-decoration: none;
    white-space: nowrap;
    transition: transform 0.2s var(--cat-ease), box-shadow 0.2s var(--cat-ease), background 0.2s var(--cat-ease);
}

.cat-btn svg {
    width: 16px;
    height: 16px;
}

.cat-btn--primary {
    color: #fff;
    background: linear-gradient(
        135deg,
        rgb(var(--cat-accent-rgb)),
        rgb(var(--c-accent-hover-rgb, var(--cat-accent-rgb)))
    );
    box-shadow: 0 10px 20px rgba(var(--cat-accent-rgb), 0.25);
}

.cat-btn--primary:hover {
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 14px 24px rgba(var(--cat-accent-rgb), 0.32);
}

.cat-btn--ghost {
    color: var(--cat-text);
    background: rgba(15, 23, 42, 0.05);
}

.cat-btn--ghost:hover {
    background: rgba(var(--cat-accent-rgb), 0.1);
    color: var(--cat-accent);
}

.cat-btn--success {
    color: #fff;
    background: linear-gradient(135deg, #10b981, #059669);
    box-shadow: 0 10px 20px rgba(16, 185, 129, 0.25);
}

/* ---------- Empty ---------- */
.cat-empty {
    text-align: center;
    padding: 3rem 1.25rem;
    border-radius: var(--cat-radius);
    background: rgba(255, 255, 255, 0.75);
    border: 1px dashed rgba(15, 23, 42, 0.14);
}

.cat-empty__icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1rem;
    display: grid;
    place-items: center;
    border-radius: 18px;
    color: var(--cat-accent);
    background: rgba(var(--cat-accent-rgb), 0.1);
}

.cat-empty__icon svg {
    width: 28px;
    height: 28px;
}

.cat-empty__title {
    margin: 0 0 0.35rem;
    font-size: 1.1rem;
    font-weight: 800;
}

.cat-empty__text {
    margin: 0;
    color: var(--cat-muted);
    font-size: 0.92rem;
}

@keyframes cat-rise {
    from {
        opacity: 0;
        transform: translateY(14px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (prefers-reduced-motion: reduce) {
    .cat-page *,
    .cat-page *::before,
    .cat-page *::after {
        animation: none !important;
        transition: none !important;
    }
}

@media (max-width: 1199.98px) {
    .cat-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (max-width: 991.98px) {
    .cat-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .cat-masthead {
        grid-template-columns: 1fr;
        justify-items: start;
    }

    .cat-masthead__media {
        width: 84px;
        height: 84px;
    }
}

@media (max-width: 575.98px) {
    .cat-page {
        padding: 1.5rem 0 2.5rem;
    }

    .cat-stats {
        grid-template-columns: 1fr;
    }

    .cat-grid {
        grid-template-columns: 1fr;
    }

    .cat-nav {
        border-radius: 18px;
    }

    .cat-card__footer {
        flex-direction: column;
        align-items: stretch;
    }

    .cat-btn {
        width: 100%;
    }
}