/* Design tokens (derived from hanlho.com) */
:root {
    --color-noir: #0b0b0c;
    --color-burgundy: #7a1e24;
    --color-offwhite: #f7f5f2;
    --color-white: #ffffff;
    --color-slate-700: #3e4348;
    --color-slate-300: #c9cdd2;

    --font-sans:
        Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto,
        Helvetica, Arial, sans-serif;
    --font-mono:
        "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas,
        monospace;

    --radius-sm: 6px;
    --radius-md: 12px;
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-6: 24px;
    --space-8: 32px;
    --space-12: 48px;
    --space-16: 64px;

    --container: 1024px;
}

/* Base */
html,
body {
    margin: 0;
    padding: 0;
}

/* Skip to content link */
.skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-burgundy);
    color: var(--color-white);
    padding: var(--space-2) var(--space-4);
    text-decoration: none;
    z-index: 100;
}

.skip-to-content:focus {
    top: 0;
}
body {
    color: var(--color-noir);
    background: var(--color-offwhite);
    font-family: var(--font-sans);
    line-height: 1.6;
    font-size: 16px;
}

a {
    color: var(--color-burgundy);
    text-decoration: none;
    transition: color 0.2s ease, text-decoration 0.2s ease;
}
a:hover {
    text-decoration: underline;
}
a:focus-visible {
    outline: 2px solid var(--color-burgundy);
    outline-offset: 2px;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.home-shell {
    background: var(--color-white);
    border-radius: var(--radius-md);
    padding: var(--space-8) var(--space-6);
    margin-top: var(--space-6);
}

/* Typography */
h1 {
    font-size: 32px;
    line-height: 40px;
    margin: 0 0 var(--space-4);
}
h2 {
    font-size: 24px;
    line-height: 32px;
    margin: var(--space-8) 0 var(--space-4);
}
h3 {
    font-size: 20px;
    line-height: 28px;
    margin: var(--space-6) 0 var(--space-3);
}
p {
    margin: 0 0 var(--space-4);
}
ul,
ol {
    margin: 0 0 var(--space-4);
}

/* Header */
.site-header {
    position: sticky;
    top: 0;
    background: var(--color-offwhite);
    border-bottom: 1px solid var(--color-slate-300);
    z-index: 10;
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}
.primary-nav {
    display: flex;
    .til-topic-pill:hover {
        text-decoration: none;
        background: rgba(122, 30, 36, 0.15);
    }
    align-items: center;
    gap: var(--space-4);
}
.primary-nav a {
    color: inherit;
    text-decoration: none;
}
.primary-nav a:hover {
    text-decoration: underline;
}

.nav-search {
    display: flex;
    align-items: center;
}

.nav-search__input {
    width: 180px;
    padding: 4px 10px;
    border: 1px solid var(--color-slate-300);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: var(--font-sans);
    background: var(--color-white);
    color: var(--color-noir);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.nav-search__input::placeholder {
    color: var(--color-slate-700);
    opacity: 0.8;
}

.nav-search__input:focus {
    outline: 2px solid var(--color-burgundy);
    outline-offset: -1px;
}

/* Hero */
.hero {
    padding: var(--space-12) 0 var(--space-8);
}
.hero h1 {
    margin-bottom: var(--space-2);
}
.subline {
    font-size: 18px;
    color: var(--color-slate-700);
    max-width: 60ch;
}
.hero.hero--compact {
    padding: var(--space-8) 0 var(--space-4);
}

.hero-topics {
    margin-top: var(--space-3);
    font-size: 14px;
    color: var(--color-slate-700);
}
.hero-topics-label {
    margin-right: var(--space-2);
    font-weight: 500;
}
.hero-topics-list {
    display: inline;
    list-style: none;
    margin: 0;
    padding: 0;
}
.hero-topics-list li {
    display: inline;
}
.hero-topics-list li + li::before {
    content: " · ";
    color: var(--color-slate-300);
}
.hero-topics-count {
    color: var(--color-slate-700);
}

.search-page h1 {
    margin-bottom: var(--space-2);
}

.search-summary {
    color: var(--color-slate-700);
    margin-bottom: var(--space-4);
}

/* Fade-in animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(4px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* TIL List */
.til-list h2 {
    margin-top: 0;
    margin-bottom: var(--space-6);
}
.til-item {
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--color-slate-300);
    animation: fadeIn 0.3s ease-out;
}
.til-item:last-child {
    border-bottom: none;
}
.til-item p {
    margin: 0;
    color: var(--color-slate-700);
}

.til-headline {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    column-gap: var(--space-3);
    row-gap: var(--space-2);
    margin-bottom: var(--space-2);
}

.til-topic-pill {
    display: inline-flex;
    align-items: center;
    padding: 2px 12px;
    border-radius: 8px;
    border: 1px solid var(--color-burgundy);
    background: var(--color-burgundy);
    color: var(--color-white);
    font-size: 12px;
    font-weight: 600;
    justify-self: start;
    white-space: nowrap;
    text-decoration: none;
    transition: filter 0.2s ease, transform 0.2s ease;
}

.til-topic-pill:hover {
    text-decoration: none;
    filter: brightness(1.05);
    transform: translateY(-1px);
}

.til-title {
    font-size: 15px;
    font-weight: 500;
    color: inherit;
}
.til-title:hover {
    text-decoration: underline;
}

.til-date {
    font-size: 12px;
    font-family: var(--font-mono);
    color: var(--color-slate-700);
    text-align: right;
}

@media (max-width: 600px) {
    .home-shell {
        padding: var(--space-6) var(--space-3);
        border-radius: 0;
    }
    .nav {
        flex-direction: column;
        align-items: stretch;
        height: auto;
        gap: var(--space-2);
    }
    .brand {
        width: 100%;
    }
    .primary-nav {
        width: 100%;
        flex-wrap: wrap;
        gap: var(--space-2);
    }
    .nav-search {
        width: 100%;
    }
    .nav-search__input {
        width: 100%;
    }
    .til-headline {
        grid-template-columns: 1fr;
        row-gap: var(--space-1);
    }
    .til-date {
        justify-self: start;
    }
}

/* Topics grid */
.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--space-2);
}
.topic-card {
    display: block;
    padding: var(--space-1);
    background: var(--color-white);
    /*border: 1px solid var(--color-slate-300);*/
    /*border-radius: var(--radius-md);*/
    color: inherit;
}
.topic-card:hover {
    text-decoration: none;
    border-color: var(--color-burgundy);
}
.topic-card h3 {
    margin: 0;
    font-size: 18px;
    color: var(--color-burgundy);
}
.topic-card .count {
    font-size: 14px;
    color: var(--color-slate-700);
    font-weight: 400;
    margin-left: var(--space-1);
}

/* Article */
.til-article {
    padding: var(--space-8) 0;
}
.article-header {
    margin-bottom: var(--space-6);
}
.article-header h1 {
    margin-bottom: var(--space-2);
}
.article-header .meta {
    font-size: 14px;
    color: var(--color-slate-700);
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
}
.topic-link {
    background: var(--color-burgundy);
    color: var(--color-white);
    border: 1px solid var(--color-burgundy);
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 600;
}
.topic-link:hover {
    text-decoration: none;
    border-color: var(--color-burgundy);
}

/* Content styling */
.content h2 {
    margin-top: var(--space-8);
}
.content h3 {
    margin-top: var(--space-6);
}
.content code {
    font-family: var(--font-mono);
    font-size: 14px;
    background: var(--color-white);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-slate-300);
}
.content pre {
    background: #2b303b;
    color: #c0c5ce;
    padding: var(--space-4);
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: var(--space-4) 0;
}
.content pre code {
    background: none;
    border: none;
    padding: 0;
    color: inherit;
}
.content blockquote {
    border-left: 3px solid var(--color-burgundy);
    margin: var(--space-4) 0;
    padding-left: var(--space-4);
    color: var(--color-slate-700);
}

/* Tables */
.content table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-6) 0;
    font-size: 14px;
}
.content th {
    background: var(--color-offwhite);
    color: var(--color-slate-700);
    font-weight: 600;
    text-align: left;
    padding: var(--space-3);
    border: 1px solid var(--color-slate-300);
}
.content td {
    padding: var(--space-3);
    border: 1px solid var(--color-slate-300);
    color: var(--color-noir);
}
.content tr:hover {
    background: rgba(122, 30, 36, 0.03);
}

/* Responsive: horizontal scroll on mobile */
@media (max-width: 600px) {
    .content table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: space-between;
    margin-top: var(--space-8);
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-slate-300);
}
.pagination .prev,
.pagination .next {
    max-width: 45%;
}

/* Footer */
.site-footer {
    padding: var(--space-8) 0;
    border-top: 1px solid var(--color-slate-300);
    margin-top: var(--space-12);
}
.site-footer .container {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-3);
    justify-content: space-between;
}
.footer-nav {
    display: flex;
    gap: var(--space-4);
}
.footer-nav a {
    color: inherit;
}
.legal {
    color: var(--color-slate-700);
    font-size: 14px;
}

/* 404 */
.error-page {
    text-align: center;
    padding: var(--space-16) 0;
}
.error-page h1 {
    font-size: 72px;
    color: var(--color-burgundy);
    margin-bottom: var(--space-4);
}
.error-page p {
    color: var(--color-slate-700);
    margin-bottom: var(--space-6);
}
.btn {
    display: inline-block;
    background: var(--color-burgundy);
    color: var(--color-white);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: filter 0.2s ease, transform 0.2s ease;
}
.btn:hover {
    filter: brightness(0.95);
    text-decoration: none;
    transform: translateY(-1px);
}

/* Section header */
.section-header {
    padding: var(--space-2) 0;
}
.section-header h1 {
    margin-bottom: var(--space-2);
}

/* Responsive */
@media (max-width: 600px) {
    h1 {
        font-size: 28px;
        line-height: 36px;
    }
    h2 {
        font-size: 20px;
        line-height: 28px;
    }
    .hero {
        padding: var(--space-8) 0 var(--space-6);
    }
    .hero-topics-list li {
        display: block;
        margin-bottom: var(--space-2);
    }
    .hero-topics-list li + li::before {
        content: "";
        display: none;
    }
    .topics-grid {
        grid-template-columns: 1fr;
    }
    .topic-card h3 {
        font-size: 16px;
    }
}

/* Search Page Enhancements */
.search-shell {
    min-height: 50vh;
}

.clear-search {
    background: none;
    border: none;
    color: var(--color-burgundy);
    cursor: pointer;
    font-size: 14px;
    text-decoration: underline;
    margin-left: var(--space-3);
    padding: 0;
}

.clear-search:hover {
    opacity: 0.8;
}

.clear-search:focus-visible {
    outline: 2px solid var(--color-burgundy);
    outline-offset: 2px;
}

/* Skeleton loading animation */
@keyframes skeleton-loading {
    0% {
        background-color: var(--color-slate-300);
    }
    50% {
        background-color: rgba(201, 205, 210, 0.5);
    }
    100% {
        background-color: var(--color-slate-300);
    }
}

.skeleton {
    background-color: var(--color-slate-300);
    animation: skeleton-loading 1s infinite;
    border-radius: var(--radius-sm);
    display: block;
}

.skeleton-pill {
    width: 60px;
    height: 20px;
}

.skeleton-title {
    height: 16px;
    width: 80%;
}

.skeleton-date {
    height: 12px;
    width: 80px;
}

.skeleton-text {
    height: 14px;
    width: 100%;
    margin-top: var(--space-2);
}

/* Search result highlighting */
.til-item mark {
    background-color: rgba(122, 30, 36, 0.15);
    color: var(--color-noir);
    padding: 2px 0;
    font-weight: 500;
}