/* ==== Theme variables ==== */
:root {
    --fg: #1a1a1a;
    --bg: #fff;
    --header-border: #1a1a1a;
    --sep: #e0e0e0;
    --muted: #888;
    --link: #777;
    --cat-fg: #1a1a1a;
    --cat-border: #ccc;
    --cat-hover: #f0f0f0;
    --cat-active-bg: #1a1a1a;
    --cat-active-fg: #fff;
    --tag-bg: #e8e8e8;
    --tag-fg: #555;
    --btn-bg: #fff;
    --btn-border: #ccc;
    --btn-hover: #f5f5f5;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --fg: #e0e0e0;
        --bg: #121212;
        --header-border: #e0e0e0;
        --sep: #333;
        --muted: #777;
        --link: #aaa;
        --cat-fg: #e0e0e0;
        --cat-border: #555;
        --cat-hover: #2a2a2a;
        --cat-active-bg: #e0e0e0;
        --cat-active-fg: #121212;
        --tag-bg: #333;
        --tag-fg: #aaa;
        --btn-bg: #1e1e1e;
        --btn-border: #444;
        --btn-hover: #2a2a2a;
    }
}

:root[data-theme="dark"] {
    --fg: #e0e0e0;
    --bg: #121212;
    --header-border: #e0e0e0;
    --sep: #333;
    --muted: #777;
    --link: #aaa;
    --cat-fg: #e0e0e0;
    --cat-border: #555;
    --cat-hover: #2a2a2a;
    --cat-active-bg: #e0e0e0;
    --cat-active-fg: #121212;
    --tag-bg: #333;
    --tag-fg: #aaa;
    --btn-bg: #1e1e1e;
    --btn-border: #444;
    --btn-hover: #2a2a2a;
}

/* ==== Base ==== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family:
        -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
        sans-serif;
    line-height: 1.6;
    max-width: 640px;
    margin: 0 auto;
    padding: 1rem;
    color: var(--fg);
    background: var(--bg);
}

header {
    padding: 1rem 0;
    border-bottom: 2px solid var(--header-border);
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}

header a {
    color: inherit;
    text-decoration: none;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.header-link {
    font-size: 0.9rem;
    color: var(--muted);
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    font-family: inherit;
    line-height: inherit;
}

.header-link:hover {
    color: var(--fg);
}

.icon {
    width: 1rem;
    height: 1rem;
    vertical-align: -0.1em;
}

#categories {
    display: flex;
    gap: 0.5rem;
    padding: 0.75rem 0;
    margin-bottom: 1rem;
    overflow-x: auto;
    border-bottom: 1px solid var(--sep);
}

#categories[hidden] {
    display: none;
}

.cat-link {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border: 1px solid var(--cat-border);
    border-radius: 999px;
    font-size: 0.85rem;
    text-decoration: none;
    color: var(--cat-fg);
    white-space: nowrap;
}

.cat-link:hover {
    background: var(--cat-hover);
}

.cat-link.active {
    background: var(--cat-active-bg);
    color: var(--cat-active-fg);
    border-color: var(--cat-active-bg);
}

.post-category {
    background: var(--tag-bg);
    color: var(--tag-fg);
    padding: 0.1rem 0.4rem;
    border-radius: 3px;
    font-size: 0.75rem;
    margin-left: 0.4rem;
}

h1 {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.post {
    padding: 1rem 0;
    border-bottom: 1px solid var(--sep);
}

.post-text {
    white-space: pre-wrap;
    word-break: break-word;
}

.post-list {
    padding-left: 1.25rem;
    margin: 0.25rem 0;
    word-break: break-word;
}

.post-list li {
    margin: 0.15rem 0;
}

.post-text a {
    color: var(--link);
    text-decoration: underline;
}

.post-image {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    margin-top: 0.5rem;
    display: block;
}

.post-link {
    display: inline-block;
    margin-top: 0.5rem;
    color: var(--link);
    text-decoration: underline;
    word-break: break-all;
}

.post-meta {
    margin-top: 0.5rem;
    font-size: 0.8rem;
    color: var(--muted);
}

.post-permalink {
    color: inherit;
    text-decoration: none;
}

.post-permalink:hover {
    text-decoration: underline;
}

.back-link {
    display: inline-block;
    margin: 1rem 0;
    color: var(--muted);
    text-decoration: none;
    font-size: 0.85rem;
}

.back-link:hover {
    text-decoration: underline;
}

.post-edited {
    font-style: italic;
}

#load-more-wrap {
    text-align: center;
    padding: 1.5rem 0;
}

#load-more {
    padding: 0.5rem 1.5rem;
    border: 1px solid var(--btn-border);
    background: var(--btn-bg);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--fg);
}

#load-more:hover {
    background: var(--btn-hover);
}

.about {
    padding: 1.5rem 0;
    line-height: 1.8;
}

.about a {
    color: var(--link);
    text-decoration: underline;
}

.about-contact {
    margin-top: 2rem;
    color: var(--muted);
    font-size: 0.9rem;
}

.about-contact a {
    color: var(--muted);
}