/* Font — self-hosted for fast rendering, no external dependency */
@font-face {
    font-family: 'Source Sans 3';
    font-style: normal;
    font-weight: 400 600;
    font-display: block;
    src: url('/fonts/source-sans-3.woff2') format('woff2');
}

html {
    font-family: 'Source Sans 3', system-ui, sans-serif;
}

/* ===================== */
/* CSS Custom Properties */
/* ===================== */

:root {
    --bg: #ffffff;
    --text: #3a3a3a;
    --text-secondary: #888;
    --link: #1d60a3;
    --link-hover: #a31d1d;
    --link-hover-border: rgba(163, 29, 29, .5);
    --code-bg: #f1f1f1;
    --border: #f1f1f1;
    --border-strong: #cccccc;
    --header-link: #333;
    --nav-bg: #ffffff;
    --nav-mobile-bg: #fafafa;
    --pagination-bg: #fafafa;
    --table-header-bg: lightgrey;
    --table-border: lightgrey;
    --slider-track: #ccc;
    --slider-track-checked: #555;
}

/* Dark theme variables */
[data-theme="dark"] {
    --bg: #232323;
    --text: #fafafa;
    --text-secondary: #999;
    --link: #6db3f2;
    --link-hover: #e05555;
    --link-hover-border: rgba(224, 85, 85, .5);
    --code-bg: #2a2a2a;
    --border: #333;
    --border-strong: #555;
    --header-link: #9b9b9b;
    --nav-bg: #232323;
    --nav-mobile-bg: #333;
    --pagination-bg: #333;
    --table-header-bg: #333;
    --table-border: #555;
    --slider-track: #555;
    --slider-track-checked: #888;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg: #232323;
        --text: #fafafa;
        --text-secondary: #999;
        --link: #6db3f2;
        --link-hover: #e05555;
        --link-hover-border: rgba(224, 85, 85, .5);
        --code-bg: #2a2a2a;
        --border: #333;
        --border-strong: #555;
        --header-link: #9b9b9b;
        --nav-bg: #232323;
        --nav-mobile-bg: #333;
        --pagination-bg: #333;
        --table-header-bg: #333;
        --table-border: #555;
        --slider-track: #555;
        --slider-track-checked: #888;
    }
}

/* ===================== */
/* Theme overrides       */
/* ===================== */

body {
    color: var(--text);
    background: var(--bg);
}

a {
    color: var(--link);
}

a:hover,
a:focus {
    color: var(--link-hover);
    border-bottom-color: var(--link-hover-border);
}

a:active {
    color: var(--link-hover);
    border-bottom-color: var(--link-hover-border);
}

pre {
    background-color: var(--code-bg);
}

blockquote {
    border-left-color: var(--border-strong);
}

hr {
    border-top-color: var(--border-strong);
}

thead {
    background: var(--table-header-bg);
}

th, td {
    border-color: var(--table-border);
}

header a {
    color: var(--header-link);
    border-bottom: 1px solid transparent;
}

header nav {
    background: var(--nav-bg);
    display: flex;
    align-items: center;
    justify-content: flex-end;
}

article:not(:last-of-type) {
    border-bottom-color: var(--border);
}

article header h1 a {
    color: var(--header-link);
}

.post-info {
    color: var(--text-secondary);
}

.post-info a {
    color: var(--text-secondary);
}

.post-info a:hover {
    color: var(--link-hover);
}

.pagination-item {
    background: var(--pagination-bg);
}

.pagination-item a {
    color: var(--text);
}

footer {
    border-top-color: var(--border);
}

small {
    color: var(--text-secondary);
}

@media (max-width: 840px) {
    header nav {
        background: var(--nav-mobile-bg);
        display: block;
        text-align: center;
        position: relative;
        padding: 0.5em 0;
    }

    header nav .theme-switch {
        position: absolute;
        right: 0.5em;
        top: 50%;
        transform: translateY(-50%);
        margin-left: 0;
    }
}

/* ===================== */
/* Theme toggle slider   */
/* ===================== */

.theme-switch {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 0;
    margin-left: 2em;
    vertical-align: middle;
    cursor: pointer;
}

.theme-icon {
    display: block;
    color: var(--text-secondary);
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.theme-switch .slider {
    position: relative;
    display: inline-block;
    width: 36px;
    height: 20px;
    background-color: var(--slider-track);
    border-radius: 20px;
    transition: background-color 0.2s;
}

.theme-switch .slider::before {
    position: absolute;
    content: "";
    height: 14px;
    width: 14px;
    left: 3px;
    bottom: 3px;
    background-color: #fff;
    border-radius: 50%;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    transition: transform 0.2s;
}

.theme-switch input:checked + .slider {
    background-color: var(--slider-track-checked);
}

.theme-switch input:checked + .slider::before {
    transform: translateX(16px);
}