/* Blog - a reading surface.
   Rule of the page: metadata never sits inside the writing. Dates, films and
   credits live in the left rail or in small type below; the column itself is
   only prose, quotes and media. */

@import url('https://fonts.googleapis.com/css2?family=Newsreader:ital,opsz,wght@0,6..72,400;0,6..72,500;0,6..72,600;1,6..72,400;1,6..72,500&display=swap');

:root {
    --blog-col: 620px;
    --blog-rail: 128px;
    --blog-gap: 40px;
    --blog-serif: 'Newsreader', Georgia, 'Times New Roman', serif;
    --blog-tamil: 'Noto Serif Tamil', 'Nirmala UI', 'Latha', serif;
    --blog-display: 'Clash Display', 'General Sans', sans-serif;
    --blog-label: 11.5px;

    /* Each strand of writing gets its own light. Nothing is drawn - the theme
       is carried by colour and texture, which is how film carries mood too. */
    --accent-cinema: #a35c22;
    /* projector amber, warm bulb through dust */
    --accent-music: #2f6f66;
    /* the green of an old cassette label */
    --accent-writing: #6b5b8a;
    /* ink */
    --accent-research: #2563a8;
    --accent-engineering: #3f6b2a;
    --accent-hackathons: #b4532a;
    --theme-accent: var(--accent-cinema);
}

html.dark-theme,
[data-theme="dark"] {
    --accent-cinema: #d9a066;
    --accent-music: #6fbdb0;
    --accent-writing: #a794c9;
    --accent-research: #7fb2ec;
    --accent-engineering: #9fcd7f;
    --accent-hackathons: #f0a07a;
}

[data-topic="hackathons"] {
    --theme-accent: var(--accent-hackathons);
}

[data-topic="research"] {
    --theme-accent: var(--accent-research);
}

[data-topic="engineering"] {
    --theme-accent: var(--accent-engineering);
}

[data-topic="cinema"] {
    --theme-accent: var(--accent-cinema);
}

[data-topic="music"] {
    --theme-accent: var(--accent-music);
}

[data-topic="writing"] {
    --theme-accent: var(--accent-writing);
}

/* Film grain. Almost subliminal - you notice it when it's removed, not when
   it's there. Sits above everything, catches nothing. */
body::after {
    content: '';
    position: fixed;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    opacity: 0.05;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/><feColorMatrix type='saturate' values='0'/></filter><rect width='160' height='160' filter='url(%23n)'/></svg>");
}

@media (prefers-reduced-motion: no-preference) {

    /* The grain drifts by a couple of pixels - projector gate weave. */
    body::after {
        animation: gate-weave 8s steps(4) infinite;
    }

    @keyframes gate-weave {
        0% {
            transform: translate(0, 0);
        }

        25% {
            transform: translate(-2px, 1px);
        }

        50% {
            transform: translate(1px, -2px);
        }

        75% {
            transform: translate(-1px, -1px);
        }

        100% {
            transform: translate(0, 0);
        }
    }
}

/* Small caps labels - the single visual language for "this is metadata". */
.label {
    font-family: var(--blog-display);
    font-size: var(--blog-label);
    font-weight: 500;
    letter-spacing: 0.11em;
    text-transform: uppercase;
    color: var(--text-accent);
}

/* ---------- Chrome ---------- */

.blog-nav {
    max-width: calc(var(--blog-rail) + var(--blog-gap) + var(--blog-col));
    margin: 0 auto;
    padding: 26px 24px 0;
}

.blog-nav-back {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 13px;
    transition: color 0.2s ease;
}

.blog-nav-back:hover {
    color: var(--text-primary);
}

/* ---------- Listing ----------
   A track listing. Number, title, theme - three columns, tight rows, and
   the horizontal space actually used instead of left empty. */

.blog-header,
.theme-bar,
.blog-list-container,
.blog-footer {
    max-width: calc(var(--blog-rail) + var(--blog-gap) + var(--blog-col));
    margin: 0 auto;
    padding-left: 24px;
    padding-right: 24px;
}

.blog-header {
    padding-top: 40px;
}

.blog-title {
    font-family: var(--blog-display);
    font-size: 38px;
    font-weight: 600;
    letter-spacing: -1.2px;
    line-height: 1;
    margin: 0 0 12px;
    color: var(--text-primary);
}

.blog-subtitle {
    font-family: var(--blog-serif);
    font-size: 17px;
    line-height: 1.5;
    color: var(--text-muted);
    margin: 0;
    max-width: 52ch;
}

.theme-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 18px;
    margin-top: 26px;
    padding-bottom: 12px;
}

.theme-chip {
    padding: 0;
    border: none;
    background: none;
    cursor: pointer;
    font-family: var(--blog-display);
    font-size: var(--blog-label);
    font-weight: 500;
    letter-spacing: 0.11em;
    text-transform: uppercase;
    color: var(--text-accent);
    transition: color 0.18s ease;
}

.theme-chip:hover {
    color: var(--text-secondary);
}

.theme-chip[aria-pressed="true"] {
    color: var(--theme-accent);
}

.theme-chip[data-topic="all"][aria-pressed="true"] {
    color: var(--text-primary);
}

.blog-list-container {
    padding-top: 0;
    padding-bottom: 72px;
}

.blog-entry {
    display: grid;
    grid-template-columns: 34px minmax(0, 1fr) auto;
    column-gap: 18px;
    align-items: baseline;
    padding: 16px 0;
    border-top: 1px solid var(--border-light);
    text-decoration: none;
}

.blog-entry:last-child {
    border-bottom: 1px solid var(--border-light);
}

.entry-num {
    font-family: var(--blog-display);
    font-size: 12.5px;
    font-weight: 500;
    font-variant-numeric: tabular-nums;
    color: var(--theme-accent);
    opacity: 0.7;
    transition: opacity 0.2s ease;
}

.blog-entry:hover .entry-num {
    opacity: 1;
}

.blog-entry-title {
    font-family: var(--blog-display);
    font-size: 20px;
    font-weight: 500;
    letter-spacing: -0.3px;
    line-height: 1.3;
    color: var(--text-primary);
    margin: 0;
    transition: color 0.2s ease;
}

.blog-entry:hover .blog-entry-title {
    color: var(--theme-accent);
}

.blog-entry-desc {
    font-family: var(--blog-serif);
    font-size: 16px;
    line-height: 1.5;
    color: var(--text-muted);
    margin: 3px 0 0;
    max-width: 58ch;
}

.entry-meta {
    text-align: right;
    white-space: nowrap;
}

.entry-meta .label {
    color: var(--theme-accent);
    opacity: 0.85;
}

.entry-meta .entry-date {
    display: block;
    margin-top: 3px;
    font-family: var(--blog-serif);
    font-size: 13px;
    font-style: italic;
    color: var(--text-accent);
    letter-spacing: 0;
    text-transform: none;
}

.blog-loading,
.blog-empty {
    font-family: var(--blog-serif);
    font-style: italic;
    color: var(--text-muted);
    font-size: 16px;
    padding: 40px 0;
}

/* ---------- Post ----------
   Two columns: a rail that holds every piece of metadata, and the writing.
   Nothing is centred, so nothing floats in the middle of an empty screen. */

.blog-post {
    max-width: calc(var(--blog-rail) + var(--blog-gap) + var(--blog-col));
    margin: 0 auto;
    padding: 0 24px 80px;
}

.post-rail {
    padding: 34px 0 0;
}

.post-rail .rail-item {
    display: block;
    margin-bottom: 5px;
}

.post-rail .rail-topic {
    color: var(--theme-accent);
}

.post-rail .rail-film {
    font-family: var(--blog-serif);
    font-size: 14px;
    font-style: italic;
    letter-spacing: 0;
    text-transform: none;
    color: var(--text-muted);
}

.post-header {
    padding: 8px 0 26px;
    margin-bottom: 30px;
    border-bottom: 1px solid var(--border-light);
}

.post-title {
    font-family: var(--blog-display);
    font-size: 36px;
    font-weight: 600;
    letter-spacing: -1.2px;
    line-height: 1.14;
    color: var(--text-primary);
    margin: 0;
}

.post-description {
    font-family: var(--blog-serif);
    font-size: 18px;
    font-style: italic;
    line-height: 1.5;
    color: var(--text-muted);
    margin: 12px 0 0;
    max-width: 50ch;
}

@media (min-width: 1000px) {
    .blog-post {
        display: grid;
        grid-template-columns: var(--blog-rail) minmax(0, var(--blog-col));
        column-gap: var(--blog-gap);
        align-items: start;
    }

    .post-rail {
        grid-column: 1;
        grid-row: 1;
        text-align: right;
        position: sticky;
        top: 34px;
        padding-top: 12px;
    }

    .post-header {
        grid-column: 2;
        grid-row: 1;
    }

    .post-body {
        grid-column: 2;
        grid-row: 2;
    }
}

/* ---------- Post body ---------- */

.post-body {
    font-family: var(--blog-serif);
    font-size: 18px;
    line-height: 1.68;
    color: var(--text-secondary);
}

.post-body p {
    margin: 0 0 20px;
}

.post-body h2 {
    font-family: var(--blog-display);
    font-size: 22px;
    font-weight: 500;
    letter-spacing: -0.3px;
    color: var(--text-primary);
    margin: 36px 0 10px;
}

.post-body h3 {
    font-family: var(--blog-display);
    font-size: 18px;
    font-weight: 500;
    color: var(--text-primary);
    margin: 28px 0 8px;
}

.post-body a {
    color: var(--text-primary);
    text-decoration: none;
    box-shadow: inset 0 -1px 0 var(--theme-accent);
    transition: box-shadow 0.2s ease;
}

.post-body a:hover {
    box-shadow: inset 0 -2px 0 var(--theme-accent);
}

.post-body strong {
    color: var(--text-primary);
    font-weight: 600;
}

.post-body hr {
    border: none;
    height: 1px;
    background: var(--border-light);
    margin: 34px 0;
}

.post-body ul,
.post-body ol {
    margin: 0 0 20px;
    padding-left: 20px;
}

.post-body li {
    margin: 5px 0;
}

.post-body blockquote {
    margin: 24px 0;
    padding-left: 18px;
    border-left: 2px solid var(--border-medium);
    color: var(--text-muted);
    font-style: italic;
}

.post-body pre {
    font-family: 'SF Mono', 'Fira Code', monospace;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    border-radius: 4px;
    padding: 16px;
    overflow-x: auto;
    margin: 24px 0;
    font-size: 13.5px;
    line-height: 1.55;
}

.post-body code {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.86em;
}

.post-body p code,
.post-body li code {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    border-radius: 3px;
    padding: 1px 5px;
}

.post-body img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    margin: 28px 0;
}

/* ---------- Lyrics ----------
   Two lines. The Tamil, then what it means. That's the whole block. */

.lyric {
    margin: 30px 0;
    padding: 0 0 0 20px;
    border-left: 2px solid var(--theme-accent);
}

.lyric-stanza {
    margin: 0 0 16px;
}

.lyric-stanza:last-of-type {
    margin-bottom: 0;
}

.lyric-ta,
.lyric-en {
    display: block;
}

.lyric-ta {
    font-family: var(--blog-tamil);
    font-size: 20px;
    font-weight: 400;
    line-height: 1.8;
    color: var(--text-primary);
}

.lyric-en {
    font-family: var(--blog-serif);
    font-size: 16px;
    font-style: italic;
    line-height: 1.45;
    color: var(--text-accent);
    margin-top: 6px;
}

/* Lowercase, italic, small. A footnote, not a headline. */
.block-credit {
    margin-top: 12px;
    font-family: var(--blog-serif);
    font-size: 13px;
    font-style: italic;
    color: var(--text-accent);
}

.block-credit .sep,
.dialogue-who .sep {
    margin: 0 6px;
    opacity: 0.5;
}

/* ---------- Dialogue ----------
   Same registers, no rule. A line someone said, not a line someone sang. */

.dialogue {
    margin: 30px 0;
}

.dialogue-line {
    margin: 0 0 12px;
}

.dialogue-ta,
.dialogue-en {
    display: block;
}

.dialogue-ta {
    font-family: var(--blog-tamil);
    font-size: 18px;
    line-height: 1.75;
    color: var(--text-primary);
}

.dialogue-en {
    font-family: var(--blog-serif);
    font-size: 16px;
    font-style: italic;
    line-height: 1.45;
    color: var(--text-accent);
    margin-top: 6px;
}

.dialogue-who {
    margin-top: 8px;
    font-family: var(--blog-serif);
    font-size: 13px;
    font-style: italic;
    color: var(--text-accent);
}

/* ---------- Media ----------
   Sits inside the column, never wider than the writing it belongs to. */

.media {
    margin: 30px 0;
}

.media-video,
.yt-facade,
.yt-frame {
    display: block;
    width: 100%;
    aspect-ratio: 16 / 9;
    border: none;
    border-radius: 4px;
    background: var(--bg-tertiary);
    object-fit: cover;
}

/* Not .media-video: that crops to 16/9, which is right for a frame of film
   and wrong for a photograph. The two-class selector is what beats the
   margin on .post-body img - the figure owns the spacing here. */
.media .media-image {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 4px;
    margin: 0;
}

.media-caption {
    margin: 10px 0 0;
    text-align: center;
    font-family: var(--blog-serif);
    font-size: 14px;
    font-style: italic;
    line-height: 1.5;
    color: var(--text-accent);
}

.media-missing .media-video {
    display: none;
}

.media-missing::before {
    content: 'clip unavailable';
    display: block;
    padding: 34px 0;
    text-align: center;
    font-family: var(--blog-serif);
    font-style: italic;
    font-size: 14px;
    color: var(--text-accent);
    background: var(--bg-tertiary);
    border: 1px dashed var(--border-medium);
    border-radius: 4px;
}

.yt-facade {
    position: relative;
    padding: 0;
    cursor: pointer;
    overflow: hidden;
}

.yt-thumb {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    margin: 0;
    border-radius: 4px;
    transition: filter 0.25s ease;
}

.yt-facade:hover .yt-thumb {
    filter: brightness(0.82);
}

.yt-play {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 54px;
    height: 54px;
    margin: -27px 0 0 -27px;
    border-radius: 50%;
    background: rgba(20, 20, 20, 0.7);
    transition: background 0.2s ease;
}

.yt-play::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    margin: -8px 0 0 -5px;
    border-style: solid;
    border-width: 8px 0 8px 13px;
    border-color: transparent transparent transparent #fff;
}

.yt-facade:hover .yt-play {
    background: rgba(20, 20, 20, 0.9);
}

/* ---------- Footer ---------- */

.blog-footer {
    padding-top: 22px;
    padding-bottom: 56px;
    border-top: 1px solid var(--border-light);
    font-size: 13px;
}

.blog-footer a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s ease;
}

.blog-footer a:hover {
    color: var(--text-primary);
}

/* ---------- Responsive ---------- */

@media (max-width: 640px) {
    .blog-title {
        font-size: 30px;
    }

    .post-title {
        font-size: 27px;
        letter-spacing: -0.9px;
    }

    .post-description {
        font-size: 16.5px;
    }

    .post-body {
        font-size: 17px;
    }

    .blog-entry {
        grid-template-columns: 26px minmax(0, 1fr);
        column-gap: 12px;
    }

    /* The theme label drops; the date moves under the description. */
    .entry-meta {
        grid-column: 2;
        text-align: left;
        margin-top: 5px;
    }

    .entry-meta .label {
        display: none;
    }

    .entry-meta .entry-date {
        margin-top: 0;
    }

    .blog-entry-title {
        font-size: 18px;
    }

    .blog-entry-desc {
        font-size: 15px;
    }

    .lyric-ta {
        font-size: 18px;
    }
}

@media (prefers-reduced-motion: reduce) {

    .yt-thumb,
    .entry-num,
    .theme-chip,
    .post-body a,
    .blog-entry-title {
        transition: none;
    }
}

/* The ground lives on <html> and body stays clear, so the drifting
   backdrop in body::before isn't painted over. */
html {
    background: var(--bg-primary);
}

body {
    background: transparent;
}