html { scroll-behavior: smooth; }
.essay-layout {
    display: flex;
    width: 85%;
    max-width: 1300px;
    margin: 0 auto;
    padding: 20px 0 50px;
}
.essay-toc {
    flex-shrink: 0;
    width: 220px;
    position: sticky;
    top: 100px;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    padding: 16px 12px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.08);
    margin-right: 24px;
}
.essay-toc__title {
    font-size: 0.95em;
    font-weight: bold;
    color: var(--text-color);
    margin: 0 0 12px 0;
    padding-bottom: 8px;
    border-bottom: 1px solid rgba(0,0,0,0.1);
}
.essay-toc__list {
    list-style: none;
    margin: 0;
    padding: 0;
}
.essay-toc__item { margin: 0; }
.essay-toc__link {
    display: block;
    padding: 6px 0;
    font-size: 0.85em;
    color: var(--text-color);
    text-decoration: none;
    line-height: 1.35;
    transition: color 0.2s;
    border-left: 2px solid transparent;
    padding-left: 8px;
    margin-left: 0;
}
.essay-toc__link:hover {
    color: var(--primary-color);
}
.essay-toc__item--h1 .essay-toc__link {
    font-weight: 600;
    margin-bottom: 2px;
}
.essay-toc__item--h2 .essay-toc__link {
    padding-left: 16px;
    margin-left: 4px;
    font-size: 0.82em;
    color: #555;
}
.essay-toc__item--h2 .essay-toc__link:hover { color: var(--primary-color); }
.essay-toc__item--h2 { margin-bottom: 2px; }
[data-theme="dark"] .essay-toc {
    background: rgba(26, 26, 26, 0.95);
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
}
[data-theme="dark"] .essay-toc__title { border-bottom-color: rgba(255,255,255,0.15); }
[data-theme="dark"] .essay-toc__item--h2 .essay-toc__link { color: #aaa; }
.content {
    flex: 1;
    min-width: 0;
    padding: 20px 24px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}
.content .scroll-margin-top { scroll-margin-top: 90px; }
.timestamp {
    font-size: 0.9em;
    color: #666;
    text-align: center;
    margin: 10px 0 30px;
}

[data-theme="dark"] .content {
    background: rgba(26, 26, 26, 0.88);
    box-shadow: 0 0 12px rgba(0, 0, 0, 0.35);
}

[data-theme="dark"] .timestamp {
    color: rgba(225, 225, 225, 0.72);
}

.content h1 {
    text-align: center;
    color: var(--text-color);
    margin-bottom: 10px;
}
.content h1[style*="text-align: left"] { text-align: left !important; }
.content h2 { scroll-margin-top: 90px; }
.content p {
    text-indent: 0em;
    line-height: 1.8;
    margin-bottom: 2em;
    color: var(--text-color);
}

.content img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 30px auto 0;
    border-radius: 8px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
}

@media (max-width: 768px) {
    .essay-layout { flex-direction: column; padding: 10px 0 30px; width: 95%; }
    .essay-toc, .essay-toc__link {
        width: 95%;
        position: static;
        max-height: 200px;
        overflow-y: auto;
        margin: 0px auto;
        padding-right: 2px;
        box-sizing: border-box;
    }
    .content {
        width: 95%;
        margin: 20px auto;
        padding-top: calc(0px + env(safe-area-inset-top));
        padding-right: calc(24px + env(safe-area-inset-right));
        padding-bottom: calc(60px + env(safe-area-inset-bottom));
        padding-left: calc(24px + env(safe-area-inset-left));
        box-sizing: border-box;
    }
    .content h1 {
        font-size: 1.7em;
        margin-bottom: 0px;
        padding-top: 15px;
    }
    .timestamp {
        margin-bottom: 0px;
    }
}