/* Base styles */
* { margin: 0; padding: 0; box-sizing: border-box; }

html { font-size: 18px; }

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: #0a0a0a;
    color: #e5e5e5;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

::selection {
    background: #fff;
    color: #000;
}

a {
    color: #fff;
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
}

a:hover {
    text-decoration-thickness: 2px;
}

/* Container */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 2rem;
}

.container-narrow {
    max-width: 700px;
    margin: 0 auto;
    padding: 0 2rem;
}

.container-wide {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header */
header {
    padding: 4rem 0 3rem;
    border-bottom: 1px solid #333;
}

.back-link {
    font-size: 0.9rem;
    color: #909090;
    margin-bottom: 2rem;
    display: inline-block;
}

.back-link:hover {
    color: #fff;
}

header h1 {
    font-family: 'Instrument Serif', Georgia, serif;
    font-size: 3.5rem;
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -0.03em;
    color: #fff;
    margin-bottom: 1rem;
}

header p {
    font-size: 1.1rem;
    color: #a0a0a0;
    max-width: 500px;
}

header .subtitle {
    font-size: 1.2rem;
    color: #a0a0a0;
}

/* Footer */
footer {
    padding: 3rem 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

footer.with-border {
    border-top: 1px solid #333;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    font-size: 0.9rem;
    color: #a0a0a0;
}

.footer-links a:hover {
    color: #fff;
}

.copyright {
    font-size: 0.8rem;
    color: #707070;
}

/* Typography */
h2 {
    font-family: 'Instrument Serif', Georgia, serif;
    font-size: 1.8rem;
    font-weight: 400;
    color: #fff;
    margin: 2.5rem 0 1rem;
    letter-spacing: -0.02em;
}

h3 {
    font-family: 'Instrument Serif', Georgia, serif;
    font-size: 1.4rem;
    font-weight: 400;
    color: #fff;
    margin: 2rem 0 0.75rem;
}

/* Content sections */
.content {
    padding: 3rem 0;
}

.content p {
    margin-bottom: 1.5rem;
    color: #ccc;
}

/* Blockquote */
blockquote {
    border-left: 2px solid #555;
    padding-left: 1.5rem;
    margin: 2rem 0;
    font-style: italic;
    color: #b0b0b0;
}

blockquote .author {
    font-style: normal;
    color: #909090;
    margin-top: 0.5rem;
    font-size: 0.9rem;
}

/* Grid sections */
.grid-section {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 4rem;
    padding: 4rem 0;
    border-bottom: 1px solid #222;
}

.grid-section:last-of-type {
    border-bottom: 1px solid #333;
}

.section-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: #909090;
    padding-top: 0.3rem;
}

.section-content h3 {
    font-family: 'Instrument Serif', Georgia, serif;
    font-size: 2rem;
    font-weight: 400;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
    color: #fff;
}

.section-content p {
    color: #a0a0a0;
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

.section-content p:last-child {
    margin-bottom: 0;
}

/* Link list */
.link-list {
    list-style: none;
}

.link-list li {
    padding: 1rem 0;
    border-bottom: 1px solid #222;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}

.link-list li:first-child {
    padding-top: 0;
}

.link-list li:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.link-list a {
    font-family: 'Instrument Serif', Georgia, serif;
    font-size: 1.4rem;
}

.link-list .meta {
    font-size: 0.8rem;
    color: #888;
}

/* Post list */
.post-list {
    list-style: none;
}

.post-list li {
    padding: 1rem 0;
    border-bottom: 1px solid #1a1a1a;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 1rem;
}

.post-list li:first-child {
    padding-top: 0;
}

.post-list li:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.post-title {
    font-family: 'Instrument Serif', Georgia, serif;
    font-size: 1.3rem;
    flex: 1;
}

.post-source {
    font-size: 0.75rem;
    color: #888;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.post-source.essays {
    color: #8bc66a;
}

.post-source.technical {
    color: #6aa8d6;
}

.post-source.blog {
    color: #d66a9a;
}

/* Month/date labels */
.month-label,
.update-date,
.talk-date {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: #909090;
    margin-bottom: 0.75rem;
}

.talk-date {
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
    color: #888;
}

/* Year section */
.year-section {
    padding: 3rem 0;
    border-bottom: 1px solid #222;
}

.year-section:last-of-type {
    border-bottom: 1px solid #333;
}

.year-label {
    font-family: 'Instrument Serif', Georgia, serif;
    font-size: 2.5rem;
    font-weight: 400;
    color: #fff;
    margin-bottom: 2rem;
    letter-spacing: -0.02em;
}

.month-group {
    margin-bottom: 2.5rem;
}

.month-group:last-child {
    margin-bottom: 0;
}

.month-label {
    color: #888;
    margin-bottom: 1rem;
}

/* Update items (Now page) */
.update {
    padding: 2rem 0;
    border-bottom: 1px solid #222;
}

.update:first-child {
    padding-top: 0;
}

.update:last-child {
    border-bottom: none;
}

.update-title {
    font-family: 'Instrument Serif', Georgia, serif;
    font-size: 1.5rem;
    font-weight: 400;
    color: #fff;
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

.update-text {
    color: #ccc;
    line-height: 1.7;
}

.update-text a {
    color: #fff;
}

.last-updated {
    font-size: 0.85rem;
    color: #909090;
    margin-top: 0.5rem;
}

/* Talk items */
.talk {
    margin-bottom: 2rem;
}

.talk:last-child {
    margin-bottom: 0;
}

.talk-title {
    font-family: 'Instrument Serif', Georgia, serif;
    font-size: 1.4rem;
    color: #ccc;
}

.talk-title a {
    color: #fff;
}

/* Quotes page */
.quote-count,
.post-count {
    font-size: 0.9rem;
    color: #909090;
    margin-top: 0.5rem;
}

.filters {
    padding: 2rem 0;
    border-bottom: 1px solid #222;
}

.filter-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: #909090;
    margin-bottom: 1rem;
    display: block;
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.filter-btn {
    background: transparent;
    border: 1px solid #444;
    color: #a0a0a0;
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s;
    border-radius: 2px;
}

.filter-btn:hover {
    border-color: #666;
    color: #fff;
}

.filter-btn.active {
    background: #fff;
    border-color: #fff;
    color: #000;
}

.quotes-list {
    padding: 2rem 0;
}

.quote-item {
    padding: 2rem 0;
    border-bottom: 1px solid #1a1a1a;
}

.quote-item:last-child {
    border-bottom: none;
}

.hidden {
    display: none;
}

.quote-text {
    font-family: 'Instrument Serif', Georgia, serif;
    font-size: 1.4rem;
    font-style: italic;
    line-height: 1.5;
    color: #ccc;
    margin-bottom: 1rem;
}

.quote-text::before {
    content: '"';
    color: #c45c3e;
}

.quote-text::after {
    content: '"';
    color: #c45c3e;
}

.quote-author {
    font-size: 0.9rem;
    color: #909090;
}

.quote-author::before {
    content: '— ';
}

/* Library page */
.book-count {
    margin-top: 0.5rem;
    font-size: 0.9rem;
    color: #888;
}

.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 2rem;
    padding: 3rem 0;
    border-bottom: 1px solid #333;
}

.book-card {
    transition: transform 0.2s;
}

.book-card:hover {
    transform: translateY(-4px);
}

.book {
    text-decoration: none;
    display: block;
}

.book:hover {
    text-decoration: none;
    opacity: 0.9;
}

.book img {
    width: 100%;
    aspect-ratio: 2/3;
    object-fit: cover;
    border-radius: 4px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.no-cover {
    width: 100%;
    aspect-ratio: 2/3;
    background: #1a1a1a;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Instrument Serif', Georgia, serif;
    font-size: 2rem;
    color: #333;
}

.book-info {
    margin-top: 0.75rem;
}

.book-title {
    font-family: 'Instrument Serif', Georgia, serif;
    font-size: 1rem;
    color: #fff;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-author {
    font-size: 0.8rem;
    color: #909090;
    margin-top: 0.25rem;
}

.book-rating {
    font-size: 0.75rem;
    color: #c45c3e;
    margin-top: 0.25rem;
    letter-spacing: 1px;
}

.book-notes-link {
    display: inline-block;
    font-size: 0.75rem;
    color: #c45c3e;
    margin-top: 0.5rem;
    text-decoration: none;
}

.book-notes-link:hover {
    text-decoration: underline;
}

/* Blog article styles */
article {
    padding: 3rem 0;
    border-bottom: 1px solid #333;
    line-height: 1.7;
}

article h2 {
    margin: 2.5rem 0 1rem;
}

article h2:first-child {
    margin-top: 0;
}

article p {
    margin-bottom: 1.5rem;
    color: #ccc;
}

article ul, article ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
    color: #ccc;
}

article li {
    margin-bottom: 0.5rem;
}

article blockquote {
    border-left: 3px solid #444;
    padding-left: 1.5rem;
    margin: 2rem 0;
    font-style: italic;
    color: #999;
}

article pre {
    background: #1a1a1a;
    padding: 1.5rem;
    border-radius: 4px;
    overflow-x: auto;
    margin: 1.5rem 0;
}

article code {
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.9rem;
}

article p code {
    background: #1a1a1a;
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
}

article img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    margin: 1.5rem 0;
}

article hr {
    border: none;
    border-top: 1px solid #333;
    margin: 3rem 0;
}

article strong {
    color: #fff;
    font-weight: 600;
}

.post-meta {
    font-size: 0.9rem;
    color: #909090;
}

/* Responsive */
@media (max-width: 768px) {
    html { font-size: 16px; }

    .container,
    .container-narrow,
    .container-wide { padding: 0 1.5rem; }

    header { padding: 3rem 0 2rem; }
    header h1 { font-size: 2.5rem; }

    .grid-section {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .year-label { font-size: 2rem; }

    .post-list li {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
    }

    .post-source {
        margin-top: 0.25rem;
    }

    .book-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
        gap: 1rem;
    }

    .update-title { font-size: 1.3rem; }
    .quote-text { font-size: 1.2rem; }
}