/* Minimal, white, modern styles for Seongsu Lee blog */
:root {
    --bg: #ffffff;
    --text: #111111;
    --subtle: #6b7280;
    --muted: #e5e7eb;
    --accent: #111111;
}

* {
    box-sizing: border-box;
}

html, body {
    height: 100%;
}

body {
    margin: 0;
    font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.wrap {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 20px;
}

.site-header {
    position: sticky;
    top: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--muted);
    z-index: 10;
}

.site-title {
    display: inline-block;
    padding: 16px 0;
    font-weight: 800;
    color: var(--text);
    text-decoration: none;
}

.site-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-toggle {
    display: none;
    border: 1px solid var(--muted);
    background: transparent;
    padding: 8px 12px;
    border-radius: 8px;
}

.nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 20px;
}

.nav-list a {
    color: var(--text);
    text-decoration: none;
    padding: 12px 0;
}

.nav-list a:hover {
    text-decoration: underline;
}

.site-main {
    padding-bottom: 64px;
}

.section {
    padding: 56px 0;
    border-bottom: 1px solid var(--muted);
}

h1, h2, h3 {
    line-height: 1.25;
    margin: 0 0 16px 0;
}

.lede {
    font-size: 1.1rem;
    color: var(--subtle);
}

.list-posts {
    list-style: none;
    margin: 0;
    padding: 0;
}

.list-posts li {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    padding: 10px 0;
    border-top: 1px dashed var(--muted);
}

.list-posts li:first-child {
    border-top: 0;
}

.list-posts .meta {
    color: var(--subtle);
    font-variant-numeric: tabular-nums;
}

.list-cards {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
}

.list-cards li {
    border: 1px solid var(--muted);
    border-radius: 12px;
    padding: 16px;
}

.list-plain {
    list-style: none;
    margin: 0;
    padding: 0;
}

.kv {
    list-style: none;
    margin: 0 0 16px 0;
    padding: 0;
    font-size: 0.9rem;
}

.kv li {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 8px;
    padding: 4px 0;
}

.kv li > span:first-child {
    font-weight: 600;
}

.button {
    display: inline-block;
    border: 1px solid var(--text);
    color: var(--text);
    text-decoration: none;
    padding: 10px 14px;
    border-radius: 999px;
}

.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
}

.site-footer {
    padding: 28px 0 56px 0;
    color: var(--subtle);
}

.skip-link {
    position: absolute;
    left: -9999px;
}

.skip-link:focus {
    left: 16px;
    top: 8px;
    background: #000;
    color: #fff;
    padding: 8px 12px;
    border-radius: 6px;
}

@media (max-width: 720px) {
    .nav-toggle { display: inline-block; }
    .nav-list {
        display: none;
        flex-direction: column;
        gap: 0;
        padding-bottom: 12px;
    }
    .nav-list.open { display: flex; }
    .two-col { grid-template-columns: 1fr; }
}