@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;600&family=Syne:wght@400;600;700;800&family=DM+Sans:ital,wght@0,300;0,400;0,500;1,300&display=swap');

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

:root {
  --bg: #0a0a0a;
  --bg2: #111111;
  --bg3: #1a1a1a;
  --border: #222222;
  --border-light: #2a2a2a;
  --text: #e8e8e8;
  --text-muted: #666;
  --text-dim: #444;
  --accent: #00d4ff;
  --accent-dim: rgba(0, 212, 255, 0.1);
  --accent2: #ff6b35;
  --green: #00ff88;
  --font-mono: 'JetBrains Mono', monospace;
  --font-display: 'Syne', sans-serif;
  --font-body: 'DM Sans', sans-serif;
  --max-w: 1200px;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

/* ── NOISE OVERLAY ── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
  opacity: 0.4;
}

/* ── TOPBAR ── */
.topbar {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
}
.topbar-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo-icon {
  width: 32px;
  height: 32px;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
}
.logo-icon svg { width: 18px; height: 18px; }
.logo-text {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.logo-text span { color: var(--accent); }
nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}
nav a {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color 0.2s;
}
nav a:hover, nav a.active { color: var(--accent); }
.nav-badge {
  background: var(--accent);
  color: var(--bg);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  padding: 3px 8px;
  letter-spacing: 0.08em;
}
.nav-badge:hover { background: #00b8d9; color: var(--bg); }

/* ── HERO ── */
.hero {
  border-bottom: 1px solid var(--border);
  padding: 5rem 2rem 4rem;
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: '';
  position: absolute;
  top: -100px;
  right: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0,212,255,0.06) 0%, transparent 70%);
  pointer-events: none;
}
.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}
.hero-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 8px;
}
.hero-tag::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 1px;
  background: var(--accent);
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
}
.hero h1 em {
  font-style: normal;
  color: var(--accent);
}
.hero-desc {
  color: var(--text-muted);
  font-size: 1rem;
  font-weight: 300;
  max-width: 420px;
  margin-bottom: 2rem;
  line-height: 1.8;
}
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }
.btn {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 12px 24px;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-primary { background: var(--accent); color: var(--bg); }
.btn-primary:hover { background: #00b8d9; }
.btn-ghost { background: transparent; color: var(--text-muted); border: 1px solid var(--border-light); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.hero-stat {
  background: var(--bg2);
  padding: 1.75rem;
}
.hero-stat-num {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.4rem;
}
.hero-stat-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* ── CATEGORY STRIP ── */
.cat-strip {
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  overflow-x: auto;
}
.cat-strip-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  gap: 0;
}
.cat-btn {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 14px 20px;
  background: none;
  border: none;
  border-right: 1px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
}
.cat-btn:first-child { border-left: 1px solid var(--border); }
.cat-btn:hover, .cat-btn.active { background: var(--accent-dim); color: var(--accent); }

/* ── MAIN GRID ── */
.main-section {
  padding: 4rem 2rem;
}
.main-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 4rem;
  align-items: start;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}
.section-label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
}
.section-line {
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ── ARTICLE CARDS ── */
.articles-list { display: flex; flex-direction: column; gap: 0; }
.article-card {
  border-bottom: 1px solid var(--border);
  padding: 2rem 0;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1.5rem;
  align-items: start;
  transition: background 0.2s;
  cursor: pointer;
}
.article-card:first-child { padding-top: 0; }
.article-card:hover .article-title { color: var(--accent); }
.article-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.6rem;
}
.article-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.6rem;
  transition: color 0.2s;
}
.article-excerpt {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 300;
  line-height: 1.7;
  margin-bottom: 1rem;
}
.article-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.article-meta-item {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  text-transform: uppercase;
}
.article-meta-item.level-basla { color: var(--green); }
.article-meta-item.level-orta { color: #ffcc00; }
.article-meta-item.level-ileri { color: var(--accent2); }
.article-arrow {
  color: var(--text-dim);
  font-size: 1.5rem;
  line-height: 1;
  margin-top: 0.25rem;
  transition: all 0.2s;
}
.article-card:hover .article-arrow { color: var(--accent); transform: translateX(4px); }

/* ── FEATURED CARD ── */
.article-card.featured {
  background: var(--bg2);
  border: 1px solid var(--border);
  padding: 2rem;
  margin-bottom: 1px;
  grid-template-columns: 1fr;
  border-bottom: 1px solid var(--border);
}
.article-card.featured .article-title { font-size: 1.5rem; }
.featured-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  background: var(--accent);
  color: var(--bg);
  padding: 3px 8px;
  margin-bottom: 0.75rem;
}

/* ── SIDEBAR ── */
.sidebar { position: sticky; top: 80px; }
.sidebar-block {
  background: var(--bg2);
  border: 1px solid var(--border);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}
.sidebar-title {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}
.cheatsheet-list { display: flex; flex-direction: column; gap: 0; }
.cheatsheet-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.2s;
}
.cheatsheet-item:last-child { border-bottom: none; }
.cheatsheet-item:hover .cs-name { color: var(--accent); }
.cs-name {
  font-size: 13px;
  font-weight: 500;
  transition: color 0.2s;
}
.cs-tag {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  background: var(--bg3);
  padding: 2px 6px;
}
.topic-list { display: flex; flex-direction: column; gap: 4px; }
.topic-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: var(--bg3);
  cursor: pointer;
  transition: background 0.2s;
  font-size: 13px;
}
.topic-item:hover { background: var(--accent-dim); color: var(--accent); }
.topic-count {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-dim);
}
.newsletter-form { display: flex; flex-direction: column; gap: 10px; }
.newsletter-form input {
  font-family: var(--font-body);
  font-size: 13px;
  padding: 10px 14px;
  background: var(--bg3);
  border: 1px solid var(--border-light);
  color: var(--text);
  outline: none;
  transition: border-color 0.2s;
}
.newsletter-form input:focus { border-color: var(--accent); }
.newsletter-form input::placeholder { color: var(--text-dim); }
.newsletter-form button {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 10px;
  background: var(--accent);
  color: var(--bg);
  border: none;
  cursor: pointer;
  transition: background 0.2s;
}
.newsletter-form button:hover { background: #00b8d9; }
.newsletter-desc {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 300;
  line-height: 1.6;
  margin-bottom: 1rem;
}

/* ── CHEATSHEET SECTION ── */
.cheatsheet-section {
  background: var(--bg2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 4rem 2rem;
}
.cheatsheet-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}
.cheatsheet-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  margin-top: 2rem;
}
.cs-card {
  background: var(--bg2);
  padding: 1.75rem;
  cursor: pointer;
  transition: background 0.2s;
  position: relative;
  overflow: hidden;
}
.cs-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--accent);
  transform: scaleY(0);
  transition: transform 0.2s;
  transform-origin: bottom;
}
.cs-card:hover { background: var(--bg3); }
.cs-card:hover::before { transform: scaleY(1); }
.cs-card-icon {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}
.cs-card-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.cs-card-desc {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 300;
  line-height: 1.6;
}
.cs-card-footer {
  margin-top: 1rem;
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ── FOOTER ── */
footer {
  border-top: 1px solid var(--border);
  padding: 3rem 2rem;
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}
.footer-copy {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.08em;
}
.footer-links {
  display: flex;
  gap: 1.5rem;
}
.footer-links a {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  transition: color 0.2s;
  text-transform: uppercase;
}
.footer-links a:hover { color: var(--accent); }

/* ── ARTICLE PAGE ── */
.article-page { padding: 3rem 2rem 5rem; }
.article-page-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 5rem;
  align-items: start;
}
.article-header { margin-bottom: 2.5rem; padding-bottom: 2rem; border-bottom: 1px solid var(--border); }
.article-header-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 8px;
}
.article-header h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}
.article-header-meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.article-header-meta span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.article-body { font-size: 1rem; line-height: 1.85; color: #d0d0d0; font-weight: 300; }
.article-body h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}
.article-body h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin: 2rem 0 0.75rem;
}
.article-body p { margin-bottom: 1.25rem; }
.article-body a { color: var(--accent); border-bottom: 1px solid rgba(0,212,255,0.3); }
.article-body a:hover { border-color: var(--accent); }
.article-body ul, .article-body ol { margin: 0 0 1.25rem 1.5rem; }
.article-body li { margin-bottom: 0.4rem; }
.article-body code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--bg3);
  border: 1px solid var(--border-light);
  padding: 2px 6px;
  color: var(--accent);
}
.article-body pre {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  padding: 1.5rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: #c8c8c8;
}
.article-body blockquote {
  background: var(--accent-dim);
  border-left: 3px solid var(--accent);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--text-muted);
}
.info-box {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--green);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}
.info-box-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 0.5rem;
}
.warning-box {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent2);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}
.warning-box-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent2);
  margin-bottom: 0.5rem;
}
.toc {
  background: var(--bg2);
  border: 1px solid var(--border);
  padding: 1.5rem;
  margin-bottom: 2rem;
}
.toc-title {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}
.toc ol { margin-left: 1.25rem; }
.toc li {
  font-size: 13px;
  margin-bottom: 0.4rem;
  color: var(--text-muted);
}
.toc a { color: var(--text-muted); transition: color 0.2s; }
.toc a:hover { color: var(--accent); }

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-stats { display: none; }
  .main-inner { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .article-page-inner { grid-template-columns: 1fr; }
  nav { gap: 1rem; }
}
@media (max-width: 600px) {
  nav a:not(.nav-badge) { display: none; }
  .topbar { padding: 0 1rem; }
  .hero, .main-section, .cheatsheet-section, footer { padding-left: 1.25rem; padding-right: 1.25rem; }
}