/* ═══════════════════════════════════════════
   Ignore the Blueprint — Design System
   Custom Pelican theme
   ═══════════════════════════════════════════ */

/* ── Design Tokens ──────────────────────── */
:root {
  /* Warm editorial palette — Restrained strategy */
  --color-page:      oklch(97.5% 0.005 75);
  --color-surface:   oklch(94% 0.005 75);
  --color-ink:       oklch(18% 0.012 70);
  --color-ink-muted: oklch(48% 0.01 70);
  --color-rule:      oklch(86% 0.006 75);
  --color-accent:    oklch(50% 0.13 40);
  --color-accent-hover: oklch(40% 0.16 35);

  /* Code block */
  --color-code-bg:   oklch(93% 0.005 75);
  --color-code-text: oklch(25% 0.01 200);

  /* Typography */
  --font-display:   "Spectral", "Noto Serif SC", "STSong", "Songti SC", "SimSun", serif;
  --font-body:      "Noto Sans", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  /* Scale — modular, ≥1.25 ratio between steps */
  --text-xs:    clamp(0.7rem, 1.5vw, 0.75rem);
  --text-sm:    clamp(0.8rem, 1.5vw, 0.875rem);
  --text-base:  clamp(1rem, 2vw, 1.125rem);
  --text-lg:    clamp(1.15rem, 2.2vw, 1.35rem);
  --text-xl:    clamp(1.4rem, 3vw, 1.75rem);
  --text-2xl:   clamp(1.75rem, 4vw, 2.25rem);
  --text-3xl:   clamp(2.2rem, 5.5vw, 3.25rem);

  /* Spacing */
  --space-xs: clamp(0.25rem, 0.5vw, 0.375rem);
  --space-sm: clamp(0.5rem, 1vw, 0.75rem);
  --space-md: clamp(1rem, 2vw, 1.5rem);
  --space-lg: clamp(1.5rem, 3vw, 2.5rem);
  --space-xl: clamp(2rem, 5vw, 4rem);
  --space-2xl: clamp(3rem, 8vw, 6rem);

  /* Layout */
  --measure: 68ch;
  --measure-wide: 72ch;

  /* Transition */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 180ms;
}

/* ── Reset & Base ───────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-ink);
  background: var(--color-page);
  max-width: var(--measure-wide);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Site Header ────────────────────────── */
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: var(--space-md);
  margin-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-rule);
}

.site-name {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 500;
  color: var(--color-ink);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.site-name:hover {
  color: var(--color-accent);
  transition: color var(--duration-fast) var(--ease-out);
}

.site-nav {
  display: flex;
  gap: var(--space-md);
}

.site-nav a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-ink-muted);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: color var(--duration-fast) var(--ease-out);
}

.site-nav a:hover {
  color: var(--color-accent);
}

/* ── Post List (Index) ──────────────────── */
.post-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.post-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.post-date {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  letter-spacing: 0.04em;
  font-weight: 400;
}

.post-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.015em;
}

.post-title a {
  color: var(--color-ink);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

.post-title a:hover {
  color: var(--color-accent);
}

.post-category {
  font-size: var(--text-xs);
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
  letter-spacing: 0.03em;
  align-self: flex-start;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.post-category:hover {
  opacity: 0.7;
}

.post-summary {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  line-height: 1.55;
  margin-top: var(--space-xs);
  max-width: var(--measure);
}

/* ── Pagination ─────────────────────────── */
.pagination {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-2xl);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-rule);
  font-size: var(--text-sm);
}

.pagination a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.pagination a:hover {
  opacity: 0.7;
}

.pagination-inactive {
  color: var(--color-rule);
}

.pagination-info {
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
}

/* ── Empty State ────────────────────────── */
.empty-state {
  padding: var(--space-2xl) 0;
  text-align: center;
  color: var(--color-ink-muted);
  font-style: italic;
}

/* ── Article ────────────────────────────── */
.article,
.page {
  max-width: var(--measure);
}

.article-header,
.page-header {
  margin-bottom: var(--space-lg);
}

.article-title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 300;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

.page-title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 300;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-md);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.meta-sep {
  display: inline-block;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--color-rule);
}

.meta-category {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.meta-category:hover {
  opacity: 0.7;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
}

.tag {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  text-decoration: none;
  padding: 0.15em 0.6em;
  border: 1px solid var(--color-rule);
  border-radius: 3px;
  transition: color var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-out);
}

.tag:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* ── Article Content ────────────────────── */
.article-content,
.page-content {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-ink);
}

.article-content p,
.page-content p {
  margin-bottom: var(--space-md);
}

.article-content a,
.page-content a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 0.18em;
  text-decoration-thickness: 1px;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.article-content a:hover,
.page-content a:hover {
  opacity: 0.7;
}

/* Headings within content */
.article-content h2,
.page-content h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 500;
  line-height: 1.3;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
  color: var(--color-ink);
}

.article-content h3,
.page-content h3 {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 500;
  line-height: 1.35;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
  color: var(--color-ink);
}

.article-content h4,
.page-content h4 {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 500;
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
}

/* Lists */
.article-content ul,
.article-content ol,
.page-content ul,
.page-content ol {
  margin-bottom: var(--space-md);
  padding-left: 1.5em;
}

.article-content li,
.page-content li {
  margin-bottom: var(--space-xs);
}

/* Blockquotes */
.article-content blockquote,
.page-content blockquote {
  margin: var(--space-md) 0;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-surface);
  border-radius: 0 4px 4px 0;
  font-style: italic;
  color: var(--color-ink-muted);
}

.article-content blockquote p,
.page-content blockquote p {
  margin-bottom: 0;
}

/* Horizontal rules */
.article-content hr,
.page-content hr {
  border: none;
  border-top: 1px solid var(--color-rule);
  margin: var(--space-lg) 0;
}

/* Images */
.article-content img,
.page-content img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: var(--space-md) auto;
}

/* ── Code ───────────────────────────────── */
code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.9em;
  padding: 0.15em 0.35em;
  background: var(--color-code-bg);
  border-radius: 3px;
  color: var(--color-code-text);
}

pre {
  margin: var(--space-md) 0;
  padding: var(--space-md);
  background: var(--color-code-bg);
  border-radius: 4px;
  overflow-x: auto;
  line-height: 1.5;
  font-size: var(--text-sm);
}

pre code {
  padding: 0;
  background: none;
  border-radius: 0;
  font-size: inherit;
}

/* Pygments line numbers */
.linenos {
  color: var(--color-rule);
  padding-right: var(--space-sm);
  user-select: none;
}

/* ── Article Footer ─────────────────────── */
.article-footer {
  margin-top: var(--space-2xl);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-rule);
}

/* ── Site Footer ────────────────────────── */
.site-footer {
  margin-top: var(--space-2xl);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-rule);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.footer-row {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.footer-row + .footer-row {
  margin-top: var(--space-xs);
}

.footer-sep {
  display: inline-block;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--color-rule);
}

.footer-row a {
  color: var(--color-ink-muted);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

.footer-row a:hover {
  color: var(--color-accent);
}

/* ── Focus ──────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ── Selection ──────────────────────────── */
::selection {
  background: oklch(50% 0.13 40 / 0.18);
  color: var(--color-ink);
}

/* ── Reduced Motion ─────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ── Print ──────────────────────────────── */
@media print {
  body {
    background: #fff;
    color: #000;
    font-size: 11pt;
    line-height: 1.5;
    max-width: none;
    padding: 0;
  }

  .site-header,
  .site-footer,
  .pagination,
  .article-footer,
  .article-tags {
    display: none;
  }

  .article-title,
  .page-title {
    font-size: 18pt;
    color: #000;
  }

  .article-content a,
  .page-content a {
    color: #000;
    text-decoration: underline;
  }

  pre,
  code {
    background: #f5f5f5;
    border: 1px solid #ddd;
  }
}