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

/* ── Tokens ───────────────────────────────────────────────────────────────── */
:root {
  --bg:           #010409;
  --border:       rgba(255, 255, 255, 0.07);
  --text-1:       #e6edf3;
  --text-2:       #8b949e;
  --text-3:       #484f58;
  --accent:       #58a6ff;
  --accent-2:     #bc8cf2;
  --accent-grad:  linear-gradient(135deg, #58a6ff 0%, #bc8cf2 100%);
  --glass-btn:    rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --font-sans:    'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-serif:   'Lora', Georgia, serif;
  --max-w:        660px;
  --pad-x:        1.5rem;
  --code-bg:      rgba(88, 166, 255, 0.08);
  --code-color:   #79c0ff;
  --code-border:  rgba(88, 166, 255, 0.12);
}

[data-theme="light"] {
  --bg:           #f5f0eb;
  --border:       rgba(0, 0, 0, 0.08);
  --text-1:       #1a1a2e;
  --text-2:       #555e68;
  --text-3:       #7a828a;
  --accent:       #2f6dba;
  --accent-2:     #8b5fc7;
  --accent-grad:  linear-gradient(135deg, #2f6dba 0%, #8b5fc7 100%);
  --glass-btn:    rgba(0, 0, 0, 0.04);
  --glass-border: rgba(0, 0, 0, 0.08);
  --code-bg:      rgba(47, 109, 186, 0.08);
  --code-color:   #2f6dba;
  --code-border:  rgba(47, 109, 186, 0.15);
}

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

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text-1);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background 0.5s ease, color 0.5s ease;
}

/* ── Ambient gradient ─────────────────────────────────────────────────────── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse at 15% 40%, rgba(88, 166, 255, 0.04) 0%, transparent 55%),
    radial-gradient(ellipse at 85% 15%, rgba(188, 140, 242, 0.04) 0%, transparent 55%);
  pointer-events: none;
  z-index: 0;
}

/* ── Reading progress bar ─────────────────────────────────────────────────── */
#progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: var(--accent-grad);
  z-index: 200;
  opacity: 0;
  transition: width 0.08s linear, opacity 0.3s;
  pointer-events: none;
}
#progress-bar.visible { opacity: 1; }

/* ── Layout ───────────────────────────────────────────────────────────────── */
.blog-wrap {
  position: relative;
  z-index: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 2.5rem var(--pad-x) 5rem;
  min-height: 100vh;
}

/* ── Nav ──────────────────────────────────────────────────────────────────── */
.blog-nav {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 3.5rem;
  font-size: 0.875rem;
  color: var(--text-3);
}

.nav-home {
  color: var(--text-2);
  text-decoration: none;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: color 0.2s;
}
.nav-home:hover { color: var(--accent); }

.nav-sep { opacity: 0.35; font-size: 0.8rem; }

#nav-crumb {
  color: var(--text-3);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ── View system ──────────────────────────────────────────────────────────── */
.view { display: none; }

.view.active {
  display: block;
  animation: viewIn 0.38s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes viewIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── List header ──────────────────────────────────────────────────────────── */
.list-header {
  margin-bottom: 3rem;
}

.list-header h1 {
  font-size: 1.75rem;
  font-weight: 300;
  color: var(--text-1);
  letter-spacing: -0.025em;
  margin-bottom: 0.5rem;
}

.list-header p {
  color: var(--text-2);
  font-size: 0.925rem;
}

/* ── Post list ────────────────────────────────────────────────────────────── */
.posts-list {
  display: flex;
  flex-direction: column;
}

.post-card {
  display: block;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  cursor: pointer;
  position: relative;
  padding-right: 1.75rem;
  transition: padding-left 0.2s cubic-bezier(0.22, 1, 0.36, 1);
}

.post-card:first-child { border-top: 1px solid var(--border); }

.post-card::after {
  content: '→';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  color: var(--accent);
  opacity: 0;
  font-size: 1rem;
  transition: opacity 0.2s, right 0.2s cubic-bezier(0.22, 1, 0.36, 1);
}

.post-card:hover { padding-left: 0.5rem; }
.post-card:hover::after { opacity: 1; right: 0.1rem; }
.post-card:hover .post-title { color: var(--text-1); }

.post-date {
  font-size: 0.72rem;
  color: var(--text-3);
  letter-spacing: 0.07em;
  text-transform: uppercase;
  margin-bottom: 0.35rem;
}

.post-title {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-2);
  line-height: 1.4;
  margin-bottom: 0.4rem;
  transition: color 0.2s;
}

.post-desc {
  font-size: 0.875rem;
  color: var(--text-3);
  line-height: 1.6;
}

/* ── Back button ──────────────────────────────────────────────────────────── */
.back-btn {
  background: none;
  border: none;
  color: var(--text-2);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  cursor: pointer;
  padding: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 2.5rem;
  transition: color 0.2s, gap 0.2s;
  letter-spacing: 0.01em;
}
.back-btn:hover { color: var(--accent); gap: 0.15rem; }

/* ── Article meta ─────────────────────────────────────────────────────────── */
.article-meta {
  margin-bottom: 2.75rem;
  padding-bottom: 2.75rem;
  border-bottom: 1px solid var(--border);
}

.article-meta h1 {
  font-size: clamp(1.55rem, 5vw, 2.1rem);
  font-weight: 400;
  color: var(--text-1);
  line-height: 1.25;
  letter-spacing: -0.025em;
  margin-bottom: 0.75rem;
}

.article-meta time {
  font-size: 0.75rem;
  color: var(--text-3);
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

/* ── Prose ────────────────────────────────────────────────────────────────── */
.prose {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-2);
}

.prose > * + * { margin-top: 1.5rem; }

.prose h1, .prose h2, .prose h3, .prose h4 {
  font-family: var(--font-sans);
  font-weight: 500;
  color: var(--text-1);
  line-height: 1.3;
  letter-spacing: -0.015em;
  margin-top: 2.75rem;
  margin-bottom: -0.5rem;
}

.prose h2 { font-size: 1.35rem; }
.prose h3 { font-size: 1.1rem; }
.prose h4 { font-size: 1rem; }

.prose a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: rgba(88, 166, 255, 0.35);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.2s;
}
.prose a:hover { text-decoration-color: var(--accent); }

.prose ul, .prose ol { padding-left: 1.6rem; }
.prose li + li { margin-top: 0.35rem; }

.prose blockquote {
  border-left: 2px solid var(--accent-2);
  padding: 0.25rem 1.25rem;
  color: var(--text-2);
  font-style: italic;
  opacity: 0.85;
}

.prose code:not(pre code) {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 0.84em;
  background: var(--code-bg);
  color: var(--code-color);
  padding: 0.15em 0.45em;
  border-radius: 5px;
  border: 1px solid var(--code-border);
}

.prose pre {
  border-radius: 10px;
  overflow-x: auto;
  border: 1px solid var(--border);
  font-size: 0; /* prevents extra whitespace */
}

.prose pre code {
  font-size: 0.875rem;
  line-height: 1.65;
  border: none;
  background: none;
  padding: 0;
}

.prose img {
  max-width: 100%;
  border-radius: 10px;
}

.prose hr {
  border: none;
  border-top: 1px solid var(--border);
}

.prose strong { color: var(--text-1); font-weight: 600; }
.prose em { font-style: italic; }

/* ── Loader ───────────────────────────────────────────────────────────────── */
.loader {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 2rem 0;
}

.loader-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  animation: blink 1.2s ease-in-out infinite;
}
.loader-dot:nth-child(2) { animation-delay: 0.2s; }
.loader-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes blink {
  0%, 80%, 100% { opacity: 0.15; transform: scale(0.7); }
  40%           { opacity: 1;    transform: scale(1); }
}

/* ── Error ────────────────────────────────────────────────────────────────── */
.error-msg {
  color: var(--text-3);
  font-size: 0.9rem;
  padding: 1.5rem 0;
}

/* ── Footer ───────────────────────────────────────────────────────────────── */
.blog-footer {
  margin-top: 5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  font-size: 0.775rem;
  color: var(--text-3);
}

/* ── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .blog-wrap    { padding: 1.75rem 1.125rem 3.5rem; }
  .blog-nav     { margin-bottom: 2.5rem; }
  .list-header  { margin-bottom: 2rem; }
  .prose        { font-size: 1rem; }
}

::selection { background: var(--accent); color: #fff; }

/* ── Theme Toggle ─────────────────────────────────────────────────────────── */

.theme-toggle {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
  z-index: 100;
  display: flex;
  align-items: center;
  background: var(--glass-btn);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 50px;
  padding: 4px;
  cursor: pointer;
  transition: background 0.5s ease, border-color 0.5s ease;
  width: 52px;
  height: 28px;
}

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

.toggle-track {
  position: relative;
  width: 100%;
  height: 100%;
}

.toggle-thumb {
  position: absolute;
  top: -1px;
  left: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent-grad);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.4s cubic-bezier(0.68, -0.15, 0.27, 1.15);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
}

[data-theme="light"] .toggle-thumb {
  transform: translateX(24px);
}

.toggle-icon {
  width: 12px;
  height: 12px;
  color: #fff;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.icon-moon,
.icon-sun {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.icon-sun {
  opacity: 0;
  transform: translate(-50%, -50%) rotate(-90deg) scale(0.5);
}

.icon-moon {
  opacity: 1;
  transform: translate(-50%, -50%) rotate(0deg) scale(1);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.icon-sun {
  transition: opacity 0.3s ease, transform 0.3s ease;
}

[data-theme="light"] .icon-moon {
  opacity: 0;
  transform: translate(-50%, -50%) rotate(90deg) scale(0.5);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

[data-theme="light"] .icon-sun {
  opacity: 1;
  transform: translate(-50%, -50%) rotate(0deg) scale(1);
}

/* ── Light theme overrides ────────────────────────────────────────────────── */

[data-theme="light"] body::before {
  background:
    radial-gradient(ellipse at 15% 40%, rgba(47, 109, 186, 0.06) 0%, transparent 55%),
    radial-gradient(ellipse at 85% 15%, rgba(139, 95, 199, 0.06) 0%, transparent 55%);
}

[data-theme="light"] .prose pre {
  background: #f6f8fa;
  border-color: var(--border);
}

[data-theme="light"] .prose pre code {
  color: #24292e;
}

[data-theme="light"] .hljs {
  background: #f6f8fa;
  color: #24292e;
}