/* ============================================
   Medium-inspired blog theme
   CSTMR-aligned palette: navy, teal, amber, coral
   Dark mode · RSS · Reading-focused
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Lora:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500&family=Source+Sans+3:wght@300;400;500;600;700&display=swap');

:root {
  --font-serif: 'Lora', Georgia, 'Times New Roman', serif;
  --font-sans: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Consolas', 'SF Mono', 'Fira Code', monospace;

  --color-text: #1a1d2e;
  --color-text-secondary: #5c6078;
  --color-text-light: #8e91a4;
  --color-bg: #ffffff;
  --color-bg-elevated: #fafbfc;
  --color-border: #e4e5eb;
  --color-accent: #1a9a8e;
  --color-accent-hover: #148578;
  --color-accent-subtle: rgba(26, 154, 142, 0.08);
  --color-warm: #d4854a;
  --color-warm-subtle: rgba(212, 133, 74, 0.1);
  --color-surface: #f3f4f7;
  --content-width: 680px;
  --nav-height: 65px;
}

[data-theme="dark"] {
  --color-text: #e2e4ea;
  --color-text-secondary: #9a9db3;
  --color-text-light: #6b6e84;
  --color-bg: #12141f;
  --color-bg-elevated: #1a1c2a;
  --color-border: #2a2d3e;
  --color-accent: #2cc4b6;
  --color-accent-hover: #3dd6c8;
  --color-accent-subtle: rgba(44, 196, 182, 0.1);
  --color-warm: #e69a5e;
  --color-warm-subtle: rgba(230, 154, 94, 0.1);
  --color-surface: #1e2030;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 18px; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  font-family: var(--font-serif);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  transition: background 0.3s ease, color 0.3s ease;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; }

/* ---- Navigation ---- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background 0.3s ease, border-color 0.3s ease;
}

.nav-inner {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  font-family: var(--font-sans);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-links a {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--color-text-secondary);
  transition: color 0.2s;
}

.nav-links a:hover { color: var(--color-text); }

/* RSS icon */
.nav-rss {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.nav-rss svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
  opacity: 0.6;
  transition: opacity 0.2s;
}

.nav-rss:hover svg { opacity: 1; }

/* Dark mode toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 100px;
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  flex-shrink: 0;
}

.theme-toggle:hover {
  background: var(--color-surface);
  border-color: var(--color-text-light);
}

.theme-toggle svg {
  width: 16px;
  height: 16px;
  stroke: var(--color-text-secondary);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
  transition: stroke 0.2s;
}

.theme-toggle .icon-moon { display: block; }
.theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }

/* ---- Accent bar ---- */
.accent-bar {
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-warm));
  opacity: 0.5;
}

/* ---- Page wrapper ---- */
.page-content {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 48px 24px 80px;
}

/* ---- Homepage / Post list ---- */
.home-header {
  margin-bottom: 48px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-border);
}

.home-header h1 {
  font-family: var(--font-serif);
  font-size: 2.6rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 12px;
}

.home-header p {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.post-list { list-style: none; }

.post-item {
  padding: 32px 0;
  border-bottom: 1px solid var(--color-border);
}

.post-item:first-child { padding-top: 0; }
.post-item:last-child { border-bottom: none; }

.post-meta {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.post-meta .dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--color-text-light);
  display: inline-block;
}

.post-item h2 {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-bottom: 6px;
}

.post-item h2 a { transition: color 0.2s; }
.post-item h2 a:hover { color: var(--color-accent); }

.post-excerpt {
  font-family: var(--font-sans);
  font-size: 0.89rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ---- Post page ---- */
.post-header { margin-bottom: 32px; }

.post-header h1 {
  font-family: var(--font-serif);
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 16px;
}

.post-subtitle {
  font-family: var(--font-sans);
  font-size: 1.2rem;
  color: var(--color-text-secondary);
  font-weight: 400;
  line-height: 1.4;
  margin-bottom: 24px;
}

.post-author-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 0;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-surface);
  overflow: hidden;
  flex-shrink: 0;
}

.author-avatar img { width: 100%; height: 100%; object-fit: cover; }

.author-info { font-family: var(--font-sans); }
.author-name { font-size: 0.83rem; font-weight: 600; }
.author-detail { font-size: 0.72rem; color: var(--color-text-secondary); }

/* ---- Post body ---- */
.post-body {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  line-height: 1.8;
  letter-spacing: -0.003em;
}

.post-body p { margin-bottom: 1.45em; }

.post-body h2 {
  font-family: var(--font-sans);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-top: 2.2em;
  margin-bottom: 0.6em;
  line-height: 1.3;
}

.post-body h3 {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 1.8em;
  margin-bottom: 0.5em;
  line-height: 1.35;
}

.post-body blockquote {
  border-left: 3px solid var(--color-accent);
  padding-left: 20px;
  margin: 1.8em 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

.post-body ul, .post-body ol {
  padding-left: 1.5em;
  margin-bottom: 1.45em;
}

.post-body li { margin-bottom: 0.4em; }

.post-body code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--color-surface);
  padding: 2px 6px;
  border-radius: 3px;
}

.post-body pre {
  background: var(--color-surface);
  padding: 20px 24px;
  border-radius: 4px;
  overflow-x: auto;
  margin-bottom: 1.45em;
  font-size: 0.82rem;
  line-height: 1.6;
  border: 1px solid var(--color-border);
}

.post-body pre code { background: none; padding: 0; }

.post-body img { margin: 2em 0; border-radius: 2px; }

.post-body a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

.post-body hr {
  border: none;
  text-align: center;
  margin: 2.4em 0;
}

.post-body hr::before {
  content: '···';
  font-size: 1.5rem;
  letter-spacing: 0.6em;
  color: var(--color-text-light);
}

/* ---- Post footer ---- */
.post-footer {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin-bottom: 32px;
}

.post-tags li a {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  padding: 6px 14px;
  background: var(--color-accent-subtle);
  border-radius: 100px;
  color: var(--color-accent);
  transition: background 0.2s;
}

.post-tags li a:hover { background: var(--color-surface); }

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 32px 24px;
  text-align: center;
  transition: border-color 0.3s ease;
}

.site-footer p {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  color: var(--color-text-light);
}

/* ---- Responsive ---- */
@media (max-width: 720px) {
  html { font-size: 16px; }
  .home-header h1 { font-size: 2rem; }
  .post-header h1 { font-size: 1.8rem; }
  .page-content { padding: 32px 20px 60px; }
  .nav-right { gap: 16px; }
  .nav-links { gap: 16px; }
}