@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:ital,wght@0,400;0,500;1,400&display=swap');

/* ===== VARIABLES ===== */
:root {
  --bg:        #ffffff;
  --text:      #111111;
  --muted:     #6b6b6b;
  --border:    #e8e8e8;
  --hover:     #444444;
  --tag-bg:    #f5f5f5;
  --code-bg:   #f5f5f5;
}
[data-theme="dark"] {
  --bg:        #171717;
  --text:      #d4d4d4;
  --muted:     #737373;
  --border:    #2a2a2a;
  --hover:     #a3a3a3;
  --tag-bg:    #212121;
  --code-bg:   #212121;
}

/* ===== RESET ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ===== BASE ===== */
html { font-size: 16px; }
body {
  font-family: 'IBM Plex Mono', monospace;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  transition: background .25s, color .25s;
  -webkit-font-smoothing: antialiased;
}

/* ===== LAYOUT ===== */
.wrap {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ===== HEADER ===== */
.site-header {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Theme toggle - LEFT side */
.theme-toggle {
  display: flex;
  gap: .75rem;
  background: none;
  border: none;
  cursor: pointer;
  font-family: 'IBM Plex Mono', monospace;
  font-size: .7rem;
  letter-spacing: .08em;
  padding: 0;
  color: var(--muted);
}
.theme-toggle span { transition: color .15s; }
.theme-toggle span.active { color: var(--text); }
.theme-toggle span.inactive { color: var(--muted); opacity: .5; }

/* Nav - RIGHT side */
.site-nav { display: flex; align-items: center; gap: .1rem; }
.site-nav a {
  font-size: .82rem;
  color: var(--muted);
  text-decoration: none;
  padding: .15rem .5rem;
  letter-spacing: .02em;
  transition: color .15s;
}
.site-nav a:hover, .site-nav a.active { color: var(--text); }
.site-nav a.rss {
  color: #c07833;
  font-size: .95rem;
  line-height: 1;
  padding-right: 0;
}
.site-nav a.rss:hover { color: #e09040; }

/* ===== HOME PAGE ===== */
.home-wrap { padding: 3rem 0 5rem; }

.profile {
  display: flex;
  align-items: flex-start;
  gap: 1.2rem;
  margin-bottom: 3rem;
}
.profile img, .profile .avatar-fallback {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  background: #2c2c2c;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #e0e0e0;
  font-size: 1.3rem;
}
.profile-text h2 {
  font-size: .95rem;
  font-weight: 500;
  margin-bottom: .3rem;
  color: var(--text);
}
.profile-text p {
  font-size: .78rem;
  color: var(--muted);
  line-height: 1.65;
}

.section-label {
  font-size: .7rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1.2rem;
  font-weight: 400;
}

.post-list { list-style: none; }
.post-list li {
  padding: .8rem 0;
  border-bottom: 1px solid var(--border);
}
.post-list li:first-child { border-top: 1px solid var(--border); }
.post-date {
  font-size: .72rem;
  color: var(--muted);
  margin-bottom: .15rem;
}
.post-list a {
  font-size: .88rem;
  color: var(--text);
  text-decoration: none;
  transition: color .15s;
}
.post-list a:hover { color: var(--hover); text-decoration: underline; text-underline-offset: 3px; }

/* ===== ARCHIVE PAGE ===== */
.archive-wrap { padding: 3rem 0 5rem; }

.archive-title {
  font-size: 2rem;
  font-weight: 500;
  margin-bottom: 2rem;
  color: var(--text);
  letter-spacing: -.02em;
}

.search-wrap { position: relative; margin-bottom: 2rem; }
.search-wrap svg {
  position: absolute;
  left: .9rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  pointer-events: none;
}
.search-input {
  width: 100%;
  font-family: 'IBM Plex Mono', monospace;
  font-size: .8rem;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: .6rem 1rem .6rem 2.4rem;
  outline: none;
  transition: border-color .15s;
}
.search-input::placeholder { color: var(--muted); }
.search-input:focus { border-color: var(--muted); }

.archive-year {
  font-size: .88rem;
  font-weight: 500;
  color: var(--text);
  margin: 2rem 0 .6rem;
  padding-bottom: .4rem;
  border-bottom: 1px solid var(--border);
}
.archive-list { list-style: none; }
.archive-list li { padding: .5rem 0; }
.archive-list a {
  font-size: .85rem;
  color: var(--text);
  text-decoration: none;
  transition: color .15s;
}
.archive-list a:hover { color: var(--hover); text-decoration: underline; text-underline-offset: 3px; }

/* ===== POST PAGE ===== */
.post-wrap { padding: 2.5rem 0 5rem; }

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin-bottom: 1.5rem;
}
.post-tags a {
  font-size: .65rem;
  letter-spacing: .08em;
  color: var(--muted);
  text-decoration: none;
  transition: color .15s;
}
.post-tags a:hover { color: var(--text); }

.post-header h1 {
  font-size: 1.25rem;
  font-weight: 500;
  line-height: 1.45;
  margin-bottom: .6rem;
  color: var(--text);
}
.post-header .post-meta-line {
  font-size: .72rem;
  color: var(--muted);
  margin-bottom: 2.5rem;
  display: flex;
  gap: 1rem;
  align-items: center;
}

/* Post body */
.post-body { font-size: .875rem; line-height: 1.85; }
.post-body p { margin-bottom: 1.2rem; }
.post-body h1, .post-body h2 {
  font-size: 1rem;
  font-weight: 500;
  margin: 2rem 0 .75rem;
  color: var(--text);
}
.post-body h3 {
  font-size: .88rem;
  font-weight: 500;
  margin: 1.5rem 0 .6rem;
  color: var(--text);
}
.post-body a { color: var(--text); text-decoration: underline; text-underline-offset: 3px; }
.post-body code {
  font-family: 'IBM Plex Mono', monospace;
  font-size: .78rem;
  background: var(--code-bg);
  padding: .1rem .35rem;
  border-radius: 3px;
}
.post-body pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin: 1.25rem 0;
  font-size: .76rem;
  line-height: 1.65;
}
.post-body pre code { background: none; padding: 0; font-size: inherit; }
.post-body blockquote {
  border-left: 2px solid var(--border);
  padding-left: 1rem;
  color: var(--muted);
  margin: 1.2rem 0;
}
.post-body ul, .post-body ol { padding-left: 1.5rem; margin-bottom: 1.2rem; }
.post-body li { margin-bottom: .3rem; }
.post-body img { max-width: 100%; border-radius: 6px; margin: 1.2rem 0; display: block; }
.post-body hr { border: none; border-top: 1px solid var(--border); margin: 2rem 0; }

/* updated_at */
.post-updated {
  font-size: .7rem;
  color: var(--muted);
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

/* prev/next nav */
.post-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: .75rem;
}
.post-nav a { color: var(--muted); text-decoration: none; transition: color .15s; max-width: 45%; }
.post-nav a:hover { color: var(--text); }
.post-nav .prev::before { content: '← '; }
.post-nav .next::after { content: ' →'; }
.post-nav .next { text-align: right; margin-left: auto; }

/* ===== STATIC PAGES ===== */
.page-wrap { padding: 2.5rem 0 5rem; }
.page-wrap h1 { font-size: 1.1rem; font-weight: 500; margin-bottom: 2rem; color: var(--text); }
.page-body { font-size: .875rem; line-height: 1.85; }
.page-body p { margin-bottom: 1.1rem; }
.page-body a { color: var(--text); }
.page-body ul { padding-left: 1.4rem; }
.page-body li { margin-bottom: .35rem; }

/* ===== FOOTER ===== */
.site-footer {
  padding: 1.5rem 0;
  border-top: 1px solid var(--border);
  font-size: .72rem;
  color: var(--muted);
}
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: var(--text); }

/* ===== RESPONSIVE ===== */
@media (max-width: 520px) {
  .site-header .wrap { flex-direction: column; align-items: flex-start; gap: .75rem; }
  .wrap { padding: 0 1rem; }
  .archive-title { font-size: 1.5rem; }
}