* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    color: #222;
    background: #f5f3ef;
}

.site-header {
    padding: 18px 32px;
    background: #2f2a24;
    color: #fff;
}

.site-header h2 {
    margin: 0 0 12px;
}

nav {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

nav a {
    color: #fff;
    text-decoration: none;
}

nav a:hover {
    text-decoration: underline;
}

main {
    width: min(1100px, calc(100% - 32px));
    margin: 32px auto;
}

.site-footer {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    margin-top: 48px;
    padding: 24px 32px;
    color: #f4efe8;
    background: #2f2a24;
}

.site-footer p {
    margin: 6px 0 0;
}

.site-footer a {
    color: #f4efe8;
}

form {
    display: grid;
    gap: 16px;
    max-width: 620px;
}

.filter-form {
    max-width: none;
    margin-bottom: 28px;
    padding: 18px;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    border: 1px solid #ddd3c6;
    border-radius: 8px;
    background: #fff;
}

.filter-actions {
    display: flex;
    align-items: end;
    gap: 14px;
}

label {
    display: grid;
    gap: 6px;
    font-weight: 700;
}

input,
select,
textarea,
button {
    font: inherit;
}

input,
select,
textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #c9c1b5;
    border-radius: 6px;
    background: #fff;
}

textarea {
    min-height: 140px;
    resize: vertical;
}

button {
    width: fit-content;
    padding: 10px 18px;
    border: 0;
    border-radius: 6px;
    color: #fff;
    background: #6c4f2f;
    cursor: pointer;
}

button:hover {
    background: #563e25;
}

.catalog {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
}

.catalog-card {
    padding: 18px;
    border: 1px solid #ddd3c6;
    border-radius: 8px;
    background: #fff;
}

.card-heading {
    display: grid;
    gap: 10px;
    margin-top: 14px;
}

.type-badge {
    width: fit-content;
    padding: 4px 8px;
    border-radius: 999px;
    color: #5a3c1e;
    background: #eadfce;
    font-size: 13px;
    font-weight: 700;
}

.catalog-card img,
.item-detail img {
    max-width: 100%;
    border-radius: 6px;
}

.image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
    gap: 8px;
}

.image-gallery img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: contain;
    background: #f5f3ef;
    border: 1px solid #e1d8cc;
}

.image-gallery-large {
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    margin-bottom: 20px;
}

.catalog-card h2 {
    margin: 0;
}

.home-links {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
    margin-top: 24px;
}

.home-link-card {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    min-height: 230px;
    aspect-ratio: 1;
    padding: 18px;
    border: 1px solid #ddd3c6;
    border-radius: 8px;
    color: #222;
    background: #fff;
    text-decoration: none;
}

.home-link-card:hover {
    border-color: #b99c74;
    background: #fbf8f3;
}

.home-link-card h2 {
    margin: 0;
    font-size: 22px;
}

.home-link-card p {
    margin: 14px 0 0;
    color: #5f574f;
    line-height: 1.45;
}

.section-heading {
    margin-bottom: 18px;
}

.section-heading h2 {
    margin: 0 0 6px;
}

.section-heading p {
    margin: 0;
    color: #6c6258;
    line-height: 1.55;
}

.home-timeline {
    margin: 28px 0;
    padding: 20px;
    border: 1px solid #ddd3c6;
    border-radius: 8px;
    background: #fff;
}

.timeline-track {
    position: relative;
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 10px;
}

.timeline-track::before {
    content: "";
    position: absolute;
    top: 15px;
    right: 8%;
    left: 8%;
    height: 2px;
    border-radius: 999px;
    background: #d8c9b7;
}

.timeline-step {
    position: relative;
    display: grid;
    gap: 6px;
    padding-top: 42px;
    text-align: center;
}

.timeline-step::before {
    content: "";
    position: absolute;
    top: 7px;
    left: 50%;
    z-index: 1;
    width: 16px;
    height: 16px;
    border: 4px solid #fff;
    border-radius: 50%;
    background: #6c4f2f;
    box-shadow: 0 0 0 1px #cbb89f;
    transform: translateX(-50%);
}

.timeline-date {
    color: #6c4f2f;
    font-size: 12px;
    font-weight: 700;
}

.timeline-step h3 {
    margin: 0;
    font-size: 16px;
}

.card-role {
    margin: 12px 0;
    font-weight: 700;
}

.card-meta {
    display: grid;
    gap: 8px;
    margin: 0;
}

.card-meta div {
    display: grid;
    gap: 2px;
}

.card-meta dt {
    margin: 0;
    color: #6c6258;
    font-size: 13px;
}

.card-meta dd {
    margin: 0;
}

.card-excerpt {
    margin: 14px 0;
}

.details-link {
    display: inline-block;
    margin-top: 4px;
}

.item-detail {
    max-width: 780px;
}

.periods-page {
    max-width: 900px;
}

.period-section {
    padding: 18px 0;
    border-bottom: 1px solid #ddd3c6;
}

.period-section summary {
    cursor: pointer;
    color: #2f2a24;
    font-size: 22px;
    font-weight: 700;
    line-height: 1.3;
}

.period-section summary::marker {
    color: #6c4f2f;
}

.period-section-body {
    padding-top: 12px;
}

.period-section-image {
    display: block;
    width: 100%;
    margin: 0 0 18px;
    border: 1px solid #ddd3c6;
    border-radius: 8px;
}

.period-section-gallery {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    margin-bottom: 18px;
}

.period-section-gallery .period-section-image {
    height: 100%;
    margin: 0;
    object-fit: contain;
    background: #fff;
}

.period-section p {
    margin: 12px 0 0;
    line-height: 1.65;
}

.period-section p:first-child {
    margin-top: 0;
}

.units-page {
    max-width: 980px;
}

.info-panel {
    margin-bottom: 24px;
    padding: 20px;
    border: 1px solid #ddd3c6;
    border-radius: 8px;
    background: #fff;
}

.info-panel h2 {
    margin: 0 0 10px;
}

.info-panel p {
    margin: 10px 0 0;
    line-height: 1.65;
}

.unit-list {
    display: grid;
    gap: 16px;
}

.unit-card {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(220px, 280px);
    gap: 20px;
    padding: 18px;
    border: 1px solid #ddd3c6;
    border-radius: 8px;
    background: #fff;
}

.unit-card .card-heading {
    margin-top: 0;
}

.unit-card-aside {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 16px;
    padding-left: 18px;
    border-left: 1px solid #eadfce;
}

.converter-page {
    max-width: 820px;
}

.page-note {
    color: #6c6258;
    line-height: 1.6;
}

.warning-note {
    position: relative;
    padding-left: 34px;
}

.warning-note::before {
    content: "!";
    position: absolute;
    top: 1px;
    left: 0;
    display: grid;
    place-items: center;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    color: #fff;
    background: #9b2f24;
    font-weight: 700;
    line-height: 1;
}

.converter-form,
.converter-result {
    max-width: none;
    margin-top: 20px;
    padding: 18px;
    border: 1px solid #ddd3c6;
    border-radius: 8px;
    background: #fff;
}

.converter-result h2 {
    margin-top: 0;
}

.conversion-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 14px;
    margin: 18px 0;
}

.conversion-summary div {
    padding: 14px;
    border: 1px solid #eadfce;
    border-radius: 8px;
    background: #fbf8f3;
}

.conversion-summary dt {
    margin: 0 0 6px;
    color: #6c6258;
    font-size: 13px;
}

.conversion-summary dd {
    margin: 0;
    font-size: 20px;
    font-weight: 700;
}

.result-warning {
    padding: 14px;
    border: 1px solid #e4c7a0;
    border-radius: 8px;
    color: #5f3c10;
    background: #fff4df;
}

.accuracy-note {
    margin-top: 28px;
}

.sources-section {
    margin-top: 34px;
    padding-top: 24px;
    border-top: 1px solid #cfc2b2;
}

.sources-section h2 {
    margin: 0 0 14px;
}

.sources-section ol {
    display: grid;
    gap: 12px;
    margin: 0;
    padding-left: 24px;
}

.sources-section li {
    line-height: 1.55;
}

.sources-section a {
    color: #5a3c1e;
    overflow-wrap: anywhere;
}

dt {
    margin-top: 12px;
    font-weight: 700;
}

dd {
    margin-left: 0;
}

@media (max-width: 720px) {
    .site-footer {
        flex-direction: column;
    }

    .home-links {
        grid-template-columns: 1fr;
    }

    .timeline-track {
        grid-template-columns: 1fr;
    }

    .timeline-track::before {
        top: 0;
        bottom: 0;
        left: 12px;
        width: 3px;
        height: auto;
    }

    .timeline-step {
        min-height: 0;
        padding: 0 0 0 38px;
        text-align: left;
    }

    .timeline-step::before {
        top: 1px;
        left: 5px;
        transform: none;
    }

    .unit-card {
        grid-template-columns: 1fr;
    }

    .unit-card-aside {
        padding-left: 0;
        padding-top: 14px;
        border-left: 0;
        border-top: 1px solid #eadfce;
    }

    .period-section-gallery {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 721px) and (max-width: 980px) {
    .home-links {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .timeline-track {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .timeline-track::before {
        display: none;
    }
}