:root {
    --page-bg: #f7f7f6;
    --surface: #fff;
    --text: #161616;
    --text-2: #333;
    --text-muted: #777;
    --line: #e6e6e3;
    --content-width: 1240px;
    --radius-card: 8px;
    --radius-control: 10px;
    --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.045);
}

* {
    box-sizing: border-box;
}

html {
    scrollbar-gutter: stable;
    color: var(--text);
    background: var(--page-bg);
    font-family:
        "Noto Sans JP",
        "Hiragino Sans",
        "Yu Gothic",
        "Meiryo",
        sans-serif;
}

body {
    margin: 0;
    background: var(--page-bg);
}

button {
    font: inherit;
}

a {
    color: inherit;
}

.site-header {
    width: min(var(--content-width), calc(100% - 48px));
    margin: 0 auto;
    padding: 24px 0 8px;
}

.brand {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
}

.brand__logo {
    display: block;
    width: auto;
    height: 24px;
}

.catalog-main {
    width: min(var(--content-width), calc(100% - 48px));
    margin: 0 auto;
    padding: 28px 0 84px;
}

.catalog-hero {
    margin-bottom: 28px;
}

.catalog-kicker {
    margin: 0 0 12px;
    font-size: 32px;
    font-weight: 800;
    line-height: 1.4;
    letter-spacing: .02em;
}

.catalog-description {
    margin: 0 0 28px;
    color: var(--text-2);
    font-size: 15px;
    font-weight: 500;
    line-height: 1.6;
}

.catalog-tabs {
    position: relative;
    isolation: isolate;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    width: min(100%, 480px);
    padding: 2px;
    border: 1px solid var(--line);
    border-radius: var(--radius-control);
    background: var(--surface);
    box-shadow: var(--shadow-card);
}

.catalog-tabs::before {
    content: "";
    position: absolute;
    z-index: -1;
    top: 2px;
    bottom: 2px;
    left: 2px;
    width: calc((100% - 4px) / 2);
    border-radius: calc(var(--radius-control) - 2px);
    background: #44B5A4;
    transform: translateX(0);
    transition: transform 280ms cubic-bezier(.22, .61, .36, 1);
    will-change: transform;
}

.catalog-tabs:has(
    .catalog-tab[data-catalog-tab="video"][aria-selected="true"]
)::before {
    transform: translateX(100%);
}

.catalog-tab {
    position: relative;
    z-index: 1;
    padding: 7px 18px;
    border: 0;
    border-radius: var(--radius-control);
    background: transparent;
    color: #aaa;
    font-size: 20px;
    font-weight: 800;
    line-height: 1.2;
    cursor: pointer;
    transition: color 160ms ease;
}

.catalog-tab[aria-selected="true"] {
    color: #fff;
}

.catalog-tab:not([aria-selected="true"]):hover {
    color: var(--text-2);
}

.catalog-tab:focus-visible {
    outline: 3px solid rgba(15, 182, 170, 0.28);
    outline-offset: -1px;
}

.catalog-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
    overflow-anchor: none;
    opacity: 1;
    transition: opacity 120ms ease;
}

.catalog-grid.is-switching {
    opacity: 0.3;
    pointer-events: none;
    transition-duration: 80ms;
}

.catalog-card {
    display: grid;
    gap: 16px;
    padding: 20px 28px;
    border: 1px solid var(--line);
    border-radius: var(--radius-card);
    background: var(--surface);
    box-shadow: var(--shadow-card);
    text-decoration: none;
    transition:
        transform 180ms ease,
        box-shadow 180ms ease,
        border-color 180ms ease;
}

.catalog-card--ebook {
    grid-template-columns: minmax(116px, 42%) minmax(0, 1fr);
}

.catalog-card--video {
    grid-template-rows: auto auto 1fr;
    gap: 10px;
}

.catalog-card:hover {
    transform: translateY(-3px);
    border-color: #d2d2ce;
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.08);
}

.catalog-card:hover .catalog-card__image {
    transform: scale(1.02);
}

.catalog-card:focus-visible {
    outline: 3px solid rgba(15, 182, 170, 0.28);
    outline-offset: 3px;
}

.catalog-card__media {
    min-width: 0;
    display: grid;
    place-items: center;
    overflow: hidden;
}

.catalog-card__image {
    display: block;
    width: 100%;
    height: 100%;
    max-height: 190px;
    object-fit: contain;
    transition: transform 220ms ease;
}

.catalog-card__media--video {
    align-self: start;
    aspect-ratio: 16 / 9;
}

.catalog-card__media--video .catalog-card__image {
    max-height: none;
    object-fit: cover;
}

.catalog-card__content {
    min-width: 0;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    margin: 4px 0;
}

.catalog-card__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-bottom: 8px;
}

.catalog-card--video .catalog-card__tags {
    width: 100%;
    margin-bottom: 0;
    flex-wrap: nowrap;
}

.catalog-tag {
    display: inline-flex;
    align-items: center;
    padding: 4px 6px;
    border-radius: 3px;
    color: #fff;
    border: 1.5px solid var(--catalog-tag-color);
    background: var(--catalog-tag-color);
    font-size: 10px;
    font-weight: 600;
    line-height: 1;
}

.catalog-duration {
    --catalog-tag-color: var(--text-2);
    flex: 0 0 auto;
    margin-left: auto;
    color: var(--catalog-tag-color);
    background: var(--surface);
}

.catalog-card__title {
    margin: 0;
    font-size: 16px;
    font-weight: 800;
    line-height: 1.4;
    letter-spacing: .01em;
}

.catalog-card__description {
    display: -webkit-box;
    margin: 9px 0 0;
    overflow: hidden;
    color: var(--text-2);
    font-size: 13px;
    font-weight: 500;
    line-height: 1.5;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 3;
}

.site-footer {
    border-top: 1px solid var(--line);
    background: #f3f3f1;
}

.site-footer__inner {
    width: min(var(--content-width), calc(100% - 48px));
    margin: 0 auto;
    padding: 32px 0 16px;
}

.site-footer__company {
    max-width: 760px;
}

.site-footer__company-name {
    margin: 0 0 8px;
    color: var(--text-2);
    font-size: 14px;
    font-weight: 700;
    line-height: 1.5;
}

.site-footer__address {
    margin: 0;
    color: #555;
    font-size: 12px;
    font-style: normal;
    font-weight: 500;
    line-height: 1.7;
}

.site-footer__links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 20px;
    margin-top: 12px;
}

.site-footer__links a {
    color: #555;
    font-size: 12px;
    font-weight: 600;
    text-underline-offset: 3px;
}

.site-footer__links a:hover {
    color: var(--text);
}

.site-footer__links a:focus-visible {
    outline: 2px solid rgba(15, 182, 170, 0.28);
    outline-offset: 3px;
}

.site-footer__licenses {
    margin-top: 14px;
    color: var(--text-muted);
    font-size: 10px;
    font-weight: 500;
    line-height: 1.7;
}

.site-footer__licenses p {
    margin: 0;
}

.site-footer__copyright {
    margin: 24px 0 0;
    padding-top: 14px;
    border-top: 1px solid var(--line);
    color: var(--text-muted);
    text-align: center;
    font-size: 10px;
}

@media (max-width: 980px) {
    .catalog-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .site-header,
    .catalog-main,
    .site-footer__inner {
        width: min(100% - 32px, var(--content-width));
    }

    .site-header {
        padding-top: 18px;
    }

    .brand__logo {
        height: 16px;
    }

    .catalog-main {
        padding-top: 18px;
    }

    .catalog-hero {
        margin-bottom: 20px;
    }

    .catalog-kicker {
        margin-bottom: 10px;
        font-size: 26px;
    }

    .catalog-description {
        margin-bottom: 24px;
        font-size: 14px;
    }

    .catalog-tab {
        padding: 6px 12px;
        font-size: 17px;
    }

    .catalog-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .catalog-card {
        min-height: 190px;
        padding: 16px;
    }

    .catalog-card__content {
        margin: 0;
    }

    .catalog-card--ebook {
        grid-template-columns: minmax(98px, 36%) minmax(0, 1fr);
    }

    .catalog-card--video {
        gap: 10px;
    }

    .catalog-card__image {
        max-height: 170px;
    }

    .site-footer__inner {
        padding-top: 26px;
    }

    .site-footer__company-name {
        font-size: 13px;
    }

    .site-footer__address,
    .site-footer__links a {
        font-size: 11px;
    }

    .site-footer__licenses {
        font-size: 9px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .catalog-tabs::before,
    .catalog-tab,
    .catalog-grid,
    .catalog-card,
    .catalog-card__image {
        transition: none;
    }

    .catalog-grid.is-switching {
        opacity: 1;
    }

    .catalog-card:hover,
    .catalog-card:hover .catalog-card__image {
        transform: none;
    }
}