.matrix-multiplication-path {
    display: grid;
    gap: 18px;
    padding: clamp(22px, 3vw, 34px);
    background: #f5f9fc;
    border: 1px solid #cfe0eb;
    border-radius: 16px;
}

.matrix-multiplication-path__intro {
    display: grid;
    gap: 8px;
    max-width: 780px;
}

.matrix-multiplication-path__intro h2 {
    margin: 0;
    color: #17202a;
    font-size: clamp(1.45rem, 2.2vw, 2rem);
    line-height: 1.2;
}

.matrix-multiplication-path__intro p {
    margin: 0;
    color: #5c6f7b;
    line-height: 1.6;
}

.matrix-multiplication-path__steps {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    overflow: hidden;
    background: #ffffff;
    border: 1px solid #d9e6ee;
    border-radius: 12px;
}

.matrix-multiplication-path__step {
    position: relative;
    display: grid;
    align-content: start;
    gap: 10px;
    min-width: 0;
    padding: 20px 18px;
}

.matrix-multiplication-path__step + .matrix-multiplication-path__step {
    border-left: 1px solid #d9e6ee;
}

.matrix-multiplication-path__step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 31px;
    right: -8px;
    z-index: 2;
    width: 16px;
    height: 16px;
    background: #ffffff;
    border-top: 1px solid #d9e6ee;
    border-right: 1px solid #d9e6ee;
    transform: rotate(45deg);
}

.matrix-multiplication-path__eyebrow {
    color: #276d9e;
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.matrix-multiplication-path__step h3 {
    margin: 0;
    color: #1f2d35;
    font-size: 1.05rem;
    line-height: 1.3;
}

.matrix-multiplication-path__step p {
    margin: 0;
    color: #5d6f7a;
    font-size: 0.94rem;
    line-height: 1.55;
}

.matrix-multiplication-path__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 4px;
}

.matrix-multiplication-path__link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 38px;
    padding: 8px 12px;
    color: #075fa8;
    background: #eef6ff;
    border: 1px solid #b9d8f0;
    border-radius: 8px;
    font-weight: 750;
    line-height: 1.25;
    text-decoration: none;
}

.matrix-multiplication-path__link:hover,
.matrix-multiplication-path__link:focus-visible {
    color: #064f8a;
    background: #e3f0fb;
    border-color: #86bce4;
    outline: none;
    box-shadow: 0 0 0 3px rgba(7, 95, 168, 0.15);
}

.matrix-multiplication-path__link--secondary {
    background: #ffffff;
}

@media (max-width: 900px) {
    .matrix-multiplication-path__steps {
        grid-template-columns: 1fr;
    }

    .matrix-multiplication-path__step + .matrix-multiplication-path__step {
        border-top: 1px solid #d9e6ee;
        border-left: 0;
    }

    .matrix-multiplication-path__step:not(:last-child)::after {
        top: auto;
        right: auto;
        bottom: -8px;
        left: 28px;
        transform: rotate(135deg);
    }
}

@media (max-width: 520px) {
    .matrix-multiplication-path {
        padding: 18px;
        border-radius: 12px;
    }

    .matrix-multiplication-path__step {
        padding: 18px 16px;
    }

    .matrix-multiplication-path__actions {
        flex-direction: column;
        align-items: stretch;
    }
}

.poster-card .matrix-multiplication-path {
    width: 100%;
    display: block;
    padding: 14px;
    background: #f8fbff;
    border: 1px solid #d8e6f2;
    border-radius: 12px;
    text-align: left;
}

.poster-card .matrix-multiplication-path h2 {
    margin: 0 0 12px;
    color: #243b53;
    font-size: 1rem;
    line-height: 1.25;
}

.poster-card .matrix-multiplication-path__nav {
    width: 100%;
}

.poster-card .matrix-multiplication-path__steps {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
    margin: 0;
    padding: 0;
    overflow: visible;
    list-style: none;
    background: transparent;
    border: 0;
    border-radius: 0;
}

.poster-card .matrix-multiplication-path__step {
    position: relative;
    display: block;
    margin: 0;
    padding: 0;
    border: 0;
}

.poster-card .matrix-multiplication-path__step + .matrix-multiplication-path__step {
    border: 0;
}

.poster-card .matrix-multiplication-path__step + .matrix-multiplication-path__step::before {
    content: "";
    position: absolute;
    top: -8px;
    left: 15px;
    width: 1px;
    height: 8px;
    background: #c7d8e6;
}

.poster-card .matrix-multiplication-path__step::after {
    content: none;
}

.poster-card .matrix-multiplication-path__link {
    display: grid;
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 8px;
    align-items: start;
    width: 100%;
    min-height: 44px;
    padding: 10px;
    color: #263f55;
    background: #ffffff;
    border: 1px solid #d9e6ee;
    border-radius: 8px;
    text-align: left;
    text-decoration: none;
    transition: border-color 0.18s ease, background-color 0.18s ease, box-shadow 0.18s ease;
}

.poster-card .matrix-multiplication-path__link:hover,
.poster-card .matrix-multiplication-path__link:focus-visible,
.poster-card .matrix-multiplication-path__sublinks a:hover,
.poster-card .matrix-multiplication-path__sublinks a:focus-visible {
    color: #075fa8;
    background: #eef6ff;
    border-color: #8ec1e6;
    outline: none;
    box-shadow: 0 0 0 3px rgba(7, 95, 168, 0.14);
}

.poster-card .matrix-multiplication-path__example {
    display: grid;
    gap: 6px;
}

.poster-card .matrix-multiplication-path__number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    color: #1a66a0;
    background: #edf5fb;
    border: 1px solid #c6dceb;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 800;
    line-height: 1;
}

.poster-card .matrix-multiplication-path__title {
    min-width: 0;
    color: inherit;
    font-size: 0.9rem;
    font-weight: 750;
    line-height: 1.25;
}

.poster-card .matrix-multiplication-path__inline-sub {
    display: block;
    margin-top: 5px;
    color: #075fa8;
    font-size: 0.82rem;
    font-weight: 750;
}

.poster-card .matrix-multiplication-path__sublinks {
    display: grid;
    grid-template-columns: 1fr;
    gap: 6px;
    min-width: 0;
    margin-top: 8px;
}

.poster-card .matrix-multiplication-path__sublinks a {
    display: block;
    width: 100%;
    padding: 7px 9px;
    color: #075fa8;
    background: #f7fbff;
    border: 1px solid #cfe2f1;
    border-radius: 7px;
    font-size: 0.84rem;
    font-weight: 750;
    line-height: 1.2;
    text-align: center;
    text-decoration: none;
}

.poster-card .matrix-multiplication-path__step--tutor .matrix-multiplication-path__link {
    background: #f0f7ff;
    border-color: #b9d8f0;
    border-left: 4px solid #1a66a0;
    padding-left: 7px;
}

@media (max-width: 1200px) {
    .poster-card .matrix-multiplication-path {
        padding: 12px;
    }

    .poster-card .matrix-multiplication-path__link {
        grid-template-columns: 30px minmax(0, 1fr);
        padding: 9px;
    }
}

@media (max-width: 768px) {
    .poster-card .matrix-multiplication-path {
        margin: 12px 0;
        padding: 14px;
        border-radius: 10px;
    }

    .poster-card .matrix-multiplication-path__steps {
        gap: 10px;
    }

    .poster-card .matrix-multiplication-path__link {
        min-height: 46px;
    }

    .poster-card .matrix-multiplication-path__sublinks {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 360px) {
    .poster-card .matrix-multiplication-path {
        padding: 12px;
    }

    .poster-card .matrix-multiplication-path__sublinks {
        grid-template-columns: 1fr;
    }
}