/* 蒸汽朋克风格 – 皮革棕 · 黄铜 · 齿轮 · 怀旧工业 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    background-color: #2d221c;
    font-family: 'Cinzel', 'Georgia', 'Times New Roman', serif;
    line-height: 1.6;
    color: #e3d9cc;
    padding: 30px 20px;
    background-image: repeating-linear-gradient(45deg, rgba(180, 130, 80, 0.03) 0px, rgba(180, 130, 80, 0.03) 20px, transparent 20px, transparent 40px);
}
.isa-steam {
    max-width: 1300px;
    margin: 0 auto;
    background-color: #3d3129;
    border: 8px solid #8b6b4b;
    border-radius: 40px 20px 40px 20px;
    box-shadow: 0 0 0 6px #c69c6d, 0 20px 30px -10px #0f0f0f, inset 0 0 30px #674a36;
    overflow: hidden;
    position: relative;
}
.isa-steam::before {
    content: '';
    position: absolute;
    top: 10px; left: 10px; right: 10px; bottom: 10px;
    border: 2px dashed #b38b5b;
    border-radius: 30px 15px 30px 15px;
    opacity: 0.3;
    pointer-events: none;
}
.isa-steam::after {
    content: '⚙️⚙️';
    position: absolute;
    bottom: 15px; left: 15px;
    font-size: 3rem;
    opacity: 0.15;
    color: #c69c6d;
    transform: rotate(-10deg);
    white-space: nowrap;
}
.isa-header {
    padding: 28px 44px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    background-color: #2f241e;
    border-bottom: 4px solid #b38b5b;
    border-top: 2px solid #8b6b4b;
    border-radius: 40px 20px 0 0;
    position: relative;
}
.isa-header::after {
    content: '';
    position: absolute;
    bottom: -8px; left: 5%; width: 90%; height: 6px;
    background: repeating-linear-gradient(90deg, #c69c6d 0px, #c69c6d 8px, transparent 8px, transparent 16px);
}
.isa-header__site {
    display: flex;
    align-items: baseline;
    gap: 16px;
}
.isa-header__sitename {
    font-size: 3rem;
    font-weight: 600;
    color: #d9b382;
    text-transform: uppercase;
    letter-spacing: 4px;
    text-shadow: 3px 3px 0 #4d382a, 5px 5px 0 #674a36;
    font-family: 'Cinzel', serif;
    border-right: 3px solid #b38b5b;
    padding-right: 20px;
}
.isa-header__sitename--light {
    font-size: 1rem;
    font-weight: 400;
    color: #c69c6d;
    text-transform: uppercase;
    letter-spacing: 3px;
    border-left: 2px solid #c69c6d;
    padding-left: 12px;
}
.isa-search {
    display: flex;
    min-width: 280px;
    background-color: #2f241e;
    border: 3px solid #8b6b4b;
    border-radius: 60px 20px 60px 20px;
    overflow: hidden;
    box-shadow: inset 0 0 10px #1f1713;
}
.isa-search__input {
    flex: 1;
    padding: 14px 24px;
    border: none;
    background: transparent;
    font-family: 'Cinzel', serif;
    font-size: 1rem;
    color: #e3d9cc;
}
.isa-search__input:focus {
    outline: none;
    background-color: #4d382a;
}
.isa-search__input::placeholder {
    color: #b38b5b;
    font-style: italic;
}
.isa-search__btn {
    background: #b38b5b;
    border: none;
    border-left: 3px solid #8b6b4b;
    color: #2d221c;
    padding: 0 32px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: 0.2s;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-family: 'Cinzel', serif;
}
.isa-search__btn:hover {
    background: #d9b382;
    color: #1f1713;
    border-left-color: #c69c6d;
}
.isa-breadcrumb {
    padding: 18px 44px 0;
    background-color: transparent;
    position: relative;
}
.isa-breadcrumb__list {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    gap: 12px 10px;
    border-bottom: 2px dashed #b38b5b;
    padding-bottom: 16px;
}
.isa-breadcrumb__item {
    font-size: 1rem;
    font-weight: 500;
}
.isa-breadcrumb__item:not(:last-child)::after {
    content: "⏤";
    margin-left: 12px;
    color: #c69c6d;
    font-size: 1.2rem;
}
.isa-breadcrumb__link {
    color: #d9b382;
    text-decoration: none;
    padding: 5px 16px;
    background-color: #2f241e;
    border: 2px solid #8b6b4b;
    border-radius: 30px 10px 30px 10px;
    display: inline-block;
    transition: 0.1s;
}
.isa-breadcrumb__link:hover {
    background-color: #b38b5b;
    color: #1f1713;
    border-color: #c69c6d;
}
.isa-breadcrumb__link--active {
    background-color: #b38b5b;
    color: #1f1713;
    border-color: #c69c6d;
    pointer-events: none;
}
.isa-main {
    padding: 36px 44px 48px;
    display: grid;
    grid-template-columns: 2.2fr 1.2fr;
    gap: 44px;
    background-color: transparent;
    position: relative;
}
.isa-article {
    background-color: #2f241e;
    border: 3px solid #8b6b4b;
    border-radius: 40px 15px 40px 15px;
    padding: 32px 30px;
    box-shadow: 10px 10px 0 #1f1713, inset 0 0 30px #4d382a;
    position: relative;
}
.isa-article::before {
    content: '';
    position: absolute;
    top: -5px; left: -5px; right: -5px; bottom: -5px;
    border: 2px dotted #c69c6d;
    border-radius: 45px 20px 45px 20px;
    opacity: 0.3;
    pointer-events: none;
}
.isa-article__header {
    margin-bottom: 24px;
    border-left: 8px solid #c69c6d;
    padding-left: 20px;
}
.isa-article__title {
    font-size: 3.2rem;
    font-weight: 600;
    line-height: 1.1;
    color: #d9b382;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-family: 'Cinzel', serif;
    text-shadow: 2px 2px 0 #4d382a, 4px 4px 0 #674a36;
}
.isa-article__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    color: #b38b5b;
    font-size: 0.95rem;
    margin-bottom: 20px;
}
.isa-article__date, .isa-article__author {
    display: flex;
    align-items: center;
    gap: 6px;
    background-color: #1f1713;
    padding: 4px 18px;
    border: 2px solid #8b6b4b;
    border-radius: 30px 10px 30px 10px;
}
.isa-article__author {
    background-color: #b38b5b;
    color: #1f1713;
    border-color: #c69c6d;
}
.isa-tags {
    margin: 24px 0 28px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.isa-tags__item {
    background-color: #1f1713;
    color: #d9b382;
    padding: 6px 22px;
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    border: 2px solid #8b6b4b;
    border-radius: 40px 10px 40px 10px;
    transition: 0.1s;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 2px 2px 0 #0f0f0f;
}
.isa-tags__item:hover {
    background-color: #c69c6d;
    color: #1f1713;
    border-color: #d9b382;
    box-shadow: 1px 1px 0 #0f0f0f;
}
.isa-article__content {
    font-size: 1.15rem;
    color: #e3d9cc;
    border-top: 3px dashed #8b6b4b;
    padding-top: 28px;
}
.isa-article__content p {
    margin-bottom: 1.2em;
}
.isa-sidebar {
    display: flex;
    flex-direction: column;
    gap: 32px;
}
.isa-widget {
    background-color: #2f241e;
    border: 3px solid #8b6b4b;
    border-radius: 40px 15px 40px 15px;
    padding: 24px 22px;
    box-shadow: 6px 6px 0 #1f1713, inset 0 0 20px #4d382a;
    position: relative;
}
.isa-widget::after {
    content: '⚙️';
    position: absolute;
    bottom: 5px; right: 10px;
    font-size: 2.2rem;
    opacity: 0.15;
    color: #c69c6d;
}
.isa-widget__title {
    font-size: 1.8rem;
    font-weight: 600;
    color: #d9b382;
    margin-bottom: 20px;
    border-bottom: 4px double #8b6b4b;
    padding-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 3px;
    font-family: 'Cinzel', serif;
}
.isa-widget__list {
    list-style: none;
}
.isa-widget__item {
    margin-bottom: 16px;
    border-left: 6px solid #8b6b4b;
    padding-left: 16px;
    transition: 0.1s;
}
.isa-widget__item:hover {
    border-left-color: #c69c6d;
}
.isa-widget__link {
    text-decoration: none;
    color: #d9b382;
    font-weight: 500;
    font-size: 1.15rem;
    display: block;
}
.isa-widget__link:hover {
    color: #c69c6d;
    text-decoration: underline wavy #8b6b4b;
}
.isa-widget__desc {
    color: #b38b5b;
    font-size: 0.85rem;
    margin-top: 4px;
    display: block;
}
.isa-footer {
    background-color: #1f1713;
    padding: 24px 44px;
    text-align: center;
    color: #b38b5b;
    border-top: 6px solid #c69c6d;
    border-radius: 0 0 40px 20px;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 4px;
    position: relative;
    box-shadow: 0 -5px 0 #0f0f0f;
}
.isa-footer::before {
    content: '⚙️';
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 2rem;
    opacity: 0.5;
    color: #c69c6d;
}
.isa-footer::after {
    content: '⚙️';
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 2rem;
    opacity: 0.5;
    color: #c69c6d;
}
@media (max-width: 900px) {
    .isa-main {
        grid-template-columns: 1fr;
    }
    .isa-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 20px;
    }
    .isa-search {
        width: 100%;
    }
}
@media (max-width: 600px) {
    .isa-header, .isa-main, .isa-breadcrumb {
        padding-left: 24px;
        padding-right: 24px;
    }
    .isa-article__title {
        font-size: 2.4rem;
    }
    .isa-article {
        padding: 24px 18px;
    }
    .isa-tags, .isa-article__meta {
        padding-left: 0;
    }
}