/* ============================================================
   Article Bot — Dark Theme Stylesheet
   ============================================================
   Design: Minimal, dark, modern. Inspired by Vercel/Linear.
   Fonts: Inter (body), JetBrains Mono (code)
   ============================================================ */

/* ── Reset & Base ────────────────────────────────────────── */

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

:root {
  --bg-primary:      #0a0a0f;
  --bg-secondary:    #111118;
  --bg-card:         #16161e;
  --bg-card-hover:   #1e1e2a;
  --bg-code:         #1a1a24;

  --text-primary:    #e4e4ef;
  --text-secondary:  #8b8b9e;
  --text-muted:      #5c5c72;

  --accent-primary:  #7c5cfc;
  --accent-glow:     rgba(124, 92, 252, 0.15);
  --accent-hover:    #9b7fff;

  --border-subtle:   #1e1e2e;
  --border-card:     #252535;

  --tag-bg:          rgba(124, 92, 252, 0.1);
  --tag-text:        #a48aff;

  --radius-sm:       6px;
  --radius-md:       10px;
  --radius-lg:       16px;

  --shadow-card:     0 1px 3px rgba(0,0,0,0.3), 0 4px 12px rgba(0,0,0,0.2);
  --shadow-hover:    0 4px 16px rgba(124, 92, 252, 0.1), 0 8px 32px rgba(0,0,0,0.3);

  --transition:      all 0.2s ease;
  --max-width:       780px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: var(--transition);
}

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

/* ── Navigation ──────────────────────────────────────────── */

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.8rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.nav-logo:hover { color: var(--accent-primary); }

.logo-icon {
  font-size: 1.3rem;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
}

.nav-link {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
  border-bottom-color: var(--accent-primary);
}

/* ── Main Content ────────────────────────────────────────── */

.main-content {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* ── Hero ────────────────────────────────────────────────── */

.hero {
  text-align: center;
  padding: 5rem 1rem 4rem;
}

.hero-title {
  font-size: 2.8rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.15;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--text-primary), var(--accent-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-icon {
  -webkit-text-fill-color: initial;
}

.hero-description {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 540px;
  margin: 0 auto 2rem;
  line-height: 1.7;
}

.hero-cta {
  display: inline-block;
  padding: 0.7rem 1.8rem;
  background: var(--accent-primary);
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.hero-cta:hover {
  background: var(--accent-hover);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(124, 92, 252, 0.3);
}

/* ── Section Titles ──────────────────────────────────────── */

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

.list-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 2rem;
}

/* ── Article Grid / Cards ────────────────────────────────── */

.article-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.article-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  transition: var(--transition);
}

.article-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
  color: var(--text-primary);
}

.card-content {
  flex: 1;
  min-width: 0;
}

.card-date {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0.3rem 0;
  letter-spacing: -0.01em;
  line-height: 1.4;
}

.card-excerpt {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-top: 0.3rem;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.6rem;
}

.card-tag {
  font-size: 0.72rem;
  color: var(--tag-text);
  background: var(--tag-bg);
  padding: 0.15rem 0.5rem;
  border-radius: 50px;
  font-weight: 500;
}

.card-arrow {
  font-size: 1.2rem;
  color: var(--text-muted);
  margin-left: 1rem;
  transition: var(--transition);
  flex-shrink: 0;
}

.article-card:hover .card-arrow {
  color: var(--accent-primary);
  transform: translateX(4px);
}

.view-all {
  text-align: center;
  margin-top: 2rem;
}

.view-all-link {
  font-weight: 600;
  font-size: 0.95rem;
}

/* ── Single Article ──────────────────────────────────────── */

.article {
  max-width: var(--max-width);
  margin: 0 auto;
}

.article-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.article-title {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 0.75rem;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.meta-sep { color: var(--text-muted); }

.original-link {
  font-weight: 500;
}

.reading-time {
  font-weight: 500;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.tag {
  font-size: 0.78rem;
  color: var(--tag-text);
  background: var(--tag-bg);
  padding: 0.2rem 0.7rem;
  border-radius: 50px;
  font-weight: 500;
  transition: var(--transition);
}

.tag:hover {
  background: rgba(124, 92, 252, 0.2);
  color: var(--accent-hover);
}

/* ── Article Body ────────────────────────────────────────── */

.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
}

.article-body h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin: 2.5rem 0 0.75rem;
  letter-spacing: -0.02em;
}

.article-body h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin: 2rem 0 0.6rem;
}

.article-body h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
}

.article-body p {
  margin-bottom: 1.2rem;
}

.article-body ul, .article-body ol {
  margin-bottom: 1.2rem;
  padding-left: 1.5rem;
}

.article-body li {
  margin-bottom: 0.4rem;
}

.article-body blockquote {
  border-left: 3px solid var(--accent-primary);
  padding: 0.5rem 1rem;
  margin: 1.5rem 0;
  background: var(--bg-card);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
  font-style: italic;
}

.article-body img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: 1.5rem 0;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.92rem;
}

.article-body th, .article-body td {
  padding: 0.6rem 1rem;
  border: 1px solid var(--border-card);
  text-align: left;
}

.article-body th {
  background: var(--bg-card);
  font-weight: 600;
}

.article-body hr {
  border: none;
  border-top: 1px solid var(--border-subtle);
  margin: 2.5rem 0;
}

/* ── Code Blocks ─────────────────────────────────────────── */

.article-body code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 0.87em;
}

.article-body :not(pre) > code {
  background: var(--bg-code);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--accent-hover);
  border: 1px solid var(--border-card);
}

.article-body pre {
  background: var(--bg-code);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 1.2rem;
  margin: 1.5rem 0;
  overflow-x: auto;
  line-height: 1.6;
}

.article-body pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text-primary);
  font-size: 0.85rem;
}

/* ── Article Footer / Nav ────────────────────────────────── */

.article-footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
}

.article-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.nav-prev, .nav-next {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.75rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  max-width: 48%;
}

.nav-prev:hover, .nav-next:hover {
  border-color: var(--accent-primary);
  background: var(--bg-card-hover);
}

.nav-next {
  text-align: right;
  margin-left: auto;
}

.nav-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* ── Pagination ──────────────────────────────────────────── */

.pagination {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 3rem;
  list-style: none;
}

.page-item .page-link {
  display: block;
  padding: 0.4rem 0.8rem;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  transition: var(--transition);
}

.page-item .page-link:hover {
  border-color: var(--accent-primary);
  color: var(--text-primary);
}

.page-item.active .page-link {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #fff;
}

/* ── Footer ──────────────────────────────────────────────── */

.site-footer {
  border-top: 1px solid var(--border-subtle);
  padding: 2rem 1.5rem;
  margin-top: 4rem;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  text-align: center;
}

.footer-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.footer-copy {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.3rem;
}

/* ── Responsive ──────────────────────────────────────────── */

@media (max-width: 768px) {
  .hero-title { font-size: 2rem; }
  .article-title { font-size: 1.6rem; }
  .nav-inner { padding: 0.6rem 1rem; }
  .main-content { padding: 1.5rem 1rem; }
  .article-nav { flex-direction: column; }
  .nav-prev, .nav-next { max-width: 100%; }
}