/* ============================================
   NeuralPulse — Design System
   Dark futurista · Neon suave · Premium
   ============================================ */

:root {
  /* Colors — Base */
  --bg-0: #06080f;
  --bg-1: #0a0e1a;
  --bg-2: #0f1424;
  --bg-3: #151a2e;
  --surface: rgba(255, 255, 255, 0.03);
  --surface-2: rgba(255, 255, 255, 0.05);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);

  /* Text */
  --text: #e8ecf5;
  --text-2: #a8b0c4;
  --text-3: #6b7390;
  --text-muted: #4d5470;

  /* Accents */
  --accent: #5b8cff;
  --accent-2: #a855f7;
  --accent-3: #22d3ee;
  --accent-green: #10b981;
  --accent-pink: #ec4899;

  /* Effects */
  --glow-blue: 0 0 40px rgba(91, 140, 255, 0.35);
  --glow-purple: 0 0 40px rgba(168, 85, 247, 0.35);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.35);

  /* Gradients */
  --grad-primary: linear-gradient(135deg, #5b8cff 0%, #a855f7 100%);
  --grad-cool: linear-gradient(135deg, #22d3ee 0%, #5b8cff 50%, #a855f7 100%);
  --grad-text: linear-gradient(135deg, #5b8cff 0%, #a855f7 50%, #ec4899 100%);

  /* Layout */
  --container: 1240px;
  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  /* Typography */
  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
  --font-display: "Space Grotesk", "Inter", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  --t-fast: 0.18s ease;
  --t-base: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --t-slow: 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg-0);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-height: 100vh;
  background-image:
    radial-gradient(circle at 15% 10%, rgba(91, 140, 255, 0.08) 0%, transparent 35%),
    radial-gradient(circle at 85% 70%, rgba(168, 85, 247, 0.07) 0%, transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(34, 211, 238, 0.05) 0%, transparent 50%);
  background-attachment: fixed;
}

img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--t-fast); }
a:hover { color: var(--accent); }

button { font: inherit; cursor: pointer; background: none; border: 0; color: inherit; }
ul, ol { list-style: none; }

::selection { background: rgba(91, 140, 255, 0.4); color: #fff; }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-1); }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ============================================
   Container & Utilities
   ============================================ */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.grad-text {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-2);
  margin-bottom: 16px;
}
.eyebrow .dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 12px var(--accent-green);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.55; transform: scale(0.85); }
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 14px;
  white-space: nowrap;
  transition: all var(--t-base);
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
}
.btn-sm { padding: 8px 16px; font-size: 13px; }
.btn-lg { padding: 16px 28px; font-size: 15px; }

.btn-primary {
  background: var(--grad-primary);
  color: #fff;
  box-shadow: var(--glow-blue);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 60px rgba(91, 140, 255, 0.55), 0 10px 30px rgba(168, 85, 247, 0.3);
  color: #fff;
}
.btn-primary::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.2), transparent);
  opacity: 0;
  transition: opacity var(--t-base);
}
.btn-primary:hover::before { opacity: 1; }

.btn-ghost {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border-strong);
  backdrop-filter: blur(10px);
}
.btn-ghost:hover {
  background: var(--surface-2);
  border-color: var(--accent);
  color: var(--text);
  transform: translateY(-2px);
}

/* ============================================
   Header
   ============================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  background: rgba(6, 8, 15, 0.7);
  border-bottom: 1px solid transparent;
  transition: all var(--t-base);
}
.site-header.scrolled {
  background: rgba(6, 8, 15, 0.92);
  border-bottom-color: var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  height: 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.01em;
  color: var(--text);
}
.brand:hover { color: var(--text); }
.brand-mark {
  display: inline-flex;
  width: 36px; height: 36px;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: var(--bg-2);
  border: 1px solid var(--border-strong);
  box-shadow: var(--glow-blue);
}
.brand-text-accent {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.main-nav ul {
  display: flex;
  align-items: center;
  gap: 6px;
}
.main-nav a {
  display: inline-block;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-2);
  border-radius: 8px;
  transition: all var(--t-fast);
}
.main-nav a:hover {
  color: var(--text);
  background: var(--surface);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  border-radius: 10px;
  color: var(--text-2);
  border: 1px solid var(--border);
  background: var(--surface);
  transition: all var(--t-fast);
}
.icon-btn:hover {
  color: var(--text);
  border-color: var(--accent);
  background: var(--surface-2);
}

.menu-toggle { display: none; }

/* Search overlay */
.search-overlay {
  position: absolute;
  top: 100%; left: 0; right: 0;
  background: rgba(10, 14, 26, 0.98);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 24px 0 32px;
  animation: slideDown 0.25s ease;
}
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}
.search-form {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-2);
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  padding: 14px 18px;
}
.search-form:focus-within {
  border-color: var(--accent);
  box-shadow: var(--glow-blue);
}
.search-form svg { color: var(--text-3); flex-shrink: 0; }
.search-form input {
  flex: 1;
  background: transparent;
  border: 0;
  color: var(--text);
  font-size: 16px;
  outline: 0;
}
.search-form input::placeholder { color: var(--text-3); }

.search-hints {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
  font-size: 13px;
  color: var(--text-3);
}

/* ============================================
   Chips
   ============================================ */
.chip {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-2);
  transition: all var(--t-fast);
}
.chip:hover {
  color: var(--text);
  border-color: var(--accent);
}
.chip-active {
  background: var(--grad-primary);
  border-color: transparent;
  color: #fff;
}

/* ============================================
   Hero
   ============================================ */
.hero {
  position: relative;
  padding: 100px 0 80px;
  overflow: hidden;
  isolation: isolate;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}
.grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(91, 140, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(91, 140, 255, 0.08) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
}
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.45;
}
.orb-1 {
  width: 500px; height: 500px;
  top: -100px; left: -120px;
  background: radial-gradient(circle, #5b8cff, transparent 70%);
  animation: float 14s ease-in-out infinite;
}
.orb-2 {
  width: 600px; height: 600px;
  top: 20%; right: -200px;
  background: radial-gradient(circle, #a855f7, transparent 70%);
  animation: float 18s ease-in-out infinite reverse;
}
.orb-3 {
  width: 400px; height: 400px;
  bottom: -150px; left: 40%;
  background: radial-gradient(circle, #22d3ee, transparent 70%);
  animation: float 16s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, -30px) scale(1.08); }
}

.hero-inner {
  position: relative;
  text-align: center;
  max-width: 920px;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5.5vw, 4.5rem);
  line-height: 1.05;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.hero-sub {
  font-size: clamp(1rem, 1.6vw, 1.25rem);
  color: var(--text-2);
  max-width: 680px;
  margin: 0 auto 36px;
  line-height: 1.55;
}

.hero-cta {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 720px;
  margin: 0 auto;
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
}
.hero-meta > div {
  text-align: center;
}
.hero-meta strong {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 4px;
}
.hero-meta span {
  font-size: 13px;
  color: var(--text-3);
}

/* ============================================
   Section titles
   ============================================ */
.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}
.section-sub {
  color: var(--text-2);
  font-size: 1rem;
  margin-bottom: 40px;
}

/* ============================================
   Quick categories
   ============================================ */
.quick-cats { padding: 80px 0 60px; }
.cats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}
.cat-card {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 24px;
  min-height: 130px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  isolation: isolate;
  transition: all var(--t-base);
}
.cat-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--c1), var(--c2));
  opacity: 0;
  z-index: -1;
  transition: opacity var(--t-base);
}
.cat-card::after {
  content: "";
  position: absolute;
  top: -20px; right: -20px;
  width: 80px; height: 80px;
  background: linear-gradient(135deg, var(--c1), var(--c2));
  filter: blur(40px);
  opacity: 0.5;
  border-radius: 50%;
  transition: opacity var(--t-base);
}
.cat-card span {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
}
.cat-card em {
  font-style: normal;
  font-size: 13px;
  color: var(--text-3);
}
.cat-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255,255,255,0.2);
}
.cat-card:hover::before { opacity: 0.18; }
.cat-card:hover::after { opacity: 0.9; }

/* ============================================
   Articles + Sidebar
   ============================================ */
.content-section { padding: 60px 0 80px; }
.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 40px;
  align-items: start;
}

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.section-head .section-title { margin-bottom: 0; }
.filter-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

/* Post card */
.post-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--t-base);
}
.post-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

.post-thumb {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 200px;
  background: var(--bg-3);
  background-image: var(--bg);
  overflow: hidden;
  isolation: isolate;
}
.post-thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 30%, rgba(255,255,255,0.15), transparent 50%),
    linear-gradient(180deg, transparent 50%, rgba(0,0,0,0.4));
  z-index: 1;
}
.thumb-glyph {
  font-size: 64px;
  z-index: 2;
  filter: drop-shadow(0 4px 12px rgba(0,0,0,0.4));
  transition: transform var(--t-slow);
}
.post-card:hover .thumb-glyph { transform: scale(1.1) rotate(-3deg); }

.badge {
  position: absolute;
  top: 14px; left: 14px;
  padding: 4px 10px;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  z-index: 2;
  color: #fff;
}

.post-featured {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  margin-bottom: 32px;
}
.post-featured .post-thumb { height: auto; min-height: 320px; }
.post-featured h3 { font-size: 1.5rem; }

.post-body {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--text-3);
}
.cat-pill {
  padding: 3px 10px;
  background: rgba(91, 140, 255, 0.12);
  color: var(--accent);
  border: 1px solid rgba(91, 140, 255, 0.25);
  border-radius: 999px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 10.5px;
}
.dot-sep { opacity: 0.4; }

.post-card h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.post-card h3 a { color: var(--text); }
.post-card h3 a:hover { color: var(--accent); }

.post-card p {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.55;
}

.post-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: auto;
  padding-top: 12px;
}
.author {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-3);
}
.avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--grad-primary);
  font-size: 11px;
  font-weight: 700;
  color: #fff;
}
.read-more {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}

.load-more-wrap {
  display: flex;
  justify-content: center;
  margin-top: 32px;
}

/* AdSense slot */
.ad-slot {
  margin: 32px 0;
  text-align: center;
}
.ad-tag {
  display: block;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.ad-placeholder {
  background: var(--surface);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
  padding: 40px 20px;
  color: var(--text-3);
  font-size: 13px;
}
.ad-placeholder-vert { padding: 120px 20px; }
.ad-slot-side { margin: 0; }

/* ============================================
   Sidebar
   ============================================ */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: sticky;
  top: 92px;
}

.side-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  position: relative;
  overflow: hidden;
}
.side-card h4 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text);
}

.side-list {
  counter-reset: pop;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.side-list li {
  counter-increment: pop;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
  font-size: 13.5px;
}
.side-list li:last-child { border-bottom: 0; padding-bottom: 0; }
.side-list li::before {
  content: counter(pop, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 2px;
}
.side-list li a {
  flex: 1;
  color: var(--text-2);
  line-height: 1.4;
}
.side-list li a:hover { color: var(--accent); }
.side-list li span {
  font-size: 11px;
  color: var(--text-muted);
  flex-shrink: 0;
}

.side-list-thumb {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.side-list-thumb li a {
  display: flex;
  gap: 12px;
  align-items: center;
  font-size: 13.5px;
  color: var(--text-2);
  line-height: 1.35;
}
.side-list-thumb li a:hover { color: var(--accent); }
.mini-thumb {
  width: 52px; height: 52px;
  border-radius: 10px;
  flex-shrink: 0;
}

/* CTA side card */
.side-card-cta {
  background: linear-gradient(160deg, rgba(91, 140, 255, 0.12), rgba(168, 85, 247, 0.08));
  border-color: rgba(91, 140, 255, 0.25);
}
.side-cta-bg {
  position: absolute;
  top: -40px; right: -40px;
  width: 120px; height: 120px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.4), transparent 70%);
  filter: blur(30px);
}
.side-card-cta p {
  font-size: 13px;
  color: var(--text-2);
  margin-bottom: 14px;
  line-height: 1.5;
}
.mini-newsletter {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.mini-newsletter input {
  background: var(--bg-2);
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  padding: 10px 14px;
  color: var(--text);
  font-size: 13px;
  outline: 0;
  transition: border-color var(--t-fast);
}
.mini-newsletter input:focus {
  border-color: var(--accent);
}
.side-card-cta small { color: var(--accent-green); font-weight: 600; font-size: 12px; }

.side-banner {
  background: linear-gradient(160deg, rgba(236, 72, 153, 0.1), rgba(245, 158, 11, 0.08));
  border-color: rgba(236, 72, 153, 0.2);
  text-align: left;
}
.side-banner p {
  font-size: 13px;
  color: var(--text-2);
  margin: 4px 0 14px;
  line-height: 1.5;
}

/* ============================================
   Tools section
   ============================================ */
.tools-section { padding: 80px 0; }
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}
.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  text-align: left;
  transition: all var(--t-base);
}
.tool-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}
.tool-icon {
  width: 52px; height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  color: #fff;
  margin-bottom: 18px;
}
.tool-card h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.tool-card p {
  color: var(--text-2);
  font-size: 14px;
  line-height: 1.5;
  margin-bottom: 16px;
}

/* ============================================
   Newsletter
   ============================================ */
.newsletter-section { padding: 40px 0 100px; }

.newsletter-card {
  position: relative;
  padding: 60px 40px;
  background: linear-gradient(135deg, rgba(91, 140, 255, 0.12), rgba(168, 85, 247, 0.12));
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-xl);
  overflow: hidden;
  isolation: isolate;
}
.newsletter-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}
.newsletter-bg::before,
.newsletter-bg::after {
  content: "";
  position: absolute;
  width: 400px; height: 400px;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
}
.newsletter-bg::before {
  background: var(--accent);
  top: -150px; left: -100px;
}
.newsletter-bg::after {
  background: var(--accent-2);
  bottom: -150px; right: -100px;
}
.newsletter-content {
  position: relative;
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}
.newsletter-content h2 {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.5vw, 2.5rem);
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}
.newsletter-sub {
  color: var(--text-2);
  margin-bottom: 28px;
  font-size: 1.05rem;
}
.newsletter-form {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  max-width: 520px;
  margin: 0 auto;
}
.newsletter-form input {
  flex: 1;
  min-width: 200px;
  background: rgba(6, 8, 15, 0.6);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  padding: 16px 22px;
  color: var(--text);
  font-size: 15px;
  outline: 0;
  transition: all var(--t-fast);
  backdrop-filter: blur(10px);
}
.newsletter-form input:focus {
  border-color: var(--accent);
  box-shadow: var(--glow-blue);
}
.newsletter-form .success {
  display: block;
  width: 100%;
  margin-top: 12px;
  color: var(--accent-green);
  font-size: 14px;
  font-weight: 600;
}
.newsletter-disclaimer {
  display: block;
  margin-top: 14px;
  font-size: 12px;
  color: var(--text-3);
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  background: var(--bg-1);
  border-top: 1px solid var(--border);
  padding-top: 60px;
  position: relative;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), var(--accent-2), transparent);
  opacity: 0.5;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 50px;
}
.footer-tag {
  font-size: 14px;
  color: var(--text-3);
  margin: 14px 0 20px;
  max-width: 320px;
  line-height: 1.5;
}
.site-footer h5 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
}
.site-footer ul li {
  margin-bottom: 10px;
}
.site-footer ul a {
  font-size: 14px;
  color: var(--text-3);
}
.site-footer ul a:hover { color: var(--accent); }

.social-row {
  display: flex;
  gap: 10px;
}
.social-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px; height: 38px;
  border-radius: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-2);
  font-size: 16px;
  transition: all var(--t-fast);
}
.social-btn:hover {
  color: #fff;
  background: var(--grad-primary);
  border-color: transparent;
  transform: translateY(-2px);
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 24px 0;
}
.footer-bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--text-3);
}

/* ============================================
   Back to top
   ============================================ */
.back-top {
  position: fixed;
  bottom: 24px; right: 24px;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--grad-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--glow-blue);
  z-index: 50;
  transition: all var(--t-base);
  opacity: 0;
  transform: translateY(20px);
}
.back-top.show {
  opacity: 1;
  transform: translateY(0);
}
.back-top:hover {
  transform: translateY(-2px);
}

/* ============================================
   Scroll reveal
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   Article (post.html)
   ============================================ */
.article-hero {
  padding: 120px 0 60px;
  position: relative;
  isolation: isolate;
}
.article-hero .orb-1, .article-hero .orb-2 {
  position: absolute; z-index: -1; filter: blur(80px); opacity: 0.35;
  border-radius: 50%;
}
.article-container { max-width: 760px; margin: 0 auto; padding: 0 24px; }
.article-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-3);
  margin-bottom: 24px;
}
.article-breadcrumb a:hover { color: var(--accent); }
.article-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}
.article-lead {
  font-size: 1.2rem;
  color: var(--text-2);
  line-height: 1.55;
  margin-bottom: 32px;
}
.article-meta-row {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.author-block {
  display: flex;
  align-items: center;
  gap: 12px;
}
.author-block .avatar { width: 42px; height: 42px; font-size: 14px; }
.author-info strong { display: block; font-size: 14px; color: var(--text); }
.author-info small { font-size: 12px; color: var(--text-3); }
.article-share {
  display: flex;
  gap: 8px;
  margin-left: auto;
}
.article-cover {
  height: 360px;
  border-radius: var(--radius-lg);
  margin-bottom: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 96px;
  background: linear-gradient(135deg, #1e1b4b, #5b21b6, #7c3aed);
  position: relative;
  overflow: hidden;
}
.article-content {
  font-size: 17px;
  line-height: 1.75;
  color: var(--text-2);
}
.article-content > * + * { margin-top: 1.2em; }
.article-content h2 {
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-top: 2em;
  margin-bottom: 0.6em;
}
.article-content h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
  margin-top: 1.5em;
}
.article-content p { color: var(--text-2); }
.article-content strong { color: var(--text); }
.article-content a {
  color: var(--accent);
  border-bottom: 1px solid rgba(91, 140, 255, 0.4);
}
.article-content a:hover { border-bottom-color: var(--accent); }
.article-content blockquote {
  border-left: 3px solid var(--accent);
  padding: 8px 0 8px 22px;
  font-style: italic;
  color: var(--text);
  background: rgba(91, 140, 255, 0.05);
  border-radius: 0 8px 8px 0;
}
.article-content ul, .article-content ol {
  padding-left: 22px;
  margin-left: 4px;
}
.article-content ul li { list-style: disc; margin-bottom: 8px; }
.article-content ol li { list-style: decimal; margin-bottom: 8px; }
.article-content code {
  background: var(--bg-2);
  border: 1px solid var(--border);
  padding: 2px 6px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.9em;
  color: var(--accent);
}
.article-content pre {
  background: var(--bg-2);
  border: 1px solid var(--border);
  padding: 20px;
  border-radius: var(--radius);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 14px;
}
.article-content img {
  border-radius: var(--radius);
  margin: 1.5em 0;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 40px 0;
}
.article-tags .chip { cursor: default; }

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .content-grid { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .post-featured { grid-template-columns: 1fr; }
  .post-featured .post-thumb { min-height: 220px; }
}

@media (max-width: 768px) {
  html { scroll-padding-top: 70px; }
  .container { padding: 0 20px; }
  .header-inner { height: 64px; }

  .main-nav {
    position: fixed;
    top: 64px;
    left: 0; right: 0;
    background: rgba(10, 14, 26, 0.98);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transform: translateY(-110%);
    transition: transform var(--t-base);
    padding: 20px;
    z-index: 99;
  }
  .main-nav.open { transform: translateY(0); }
  .main-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }
  .main-nav a {
    display: block;
    padding: 14px 16px;
    border-radius: 10px;
    font-size: 16px;
    color: var(--text);
  }

  .menu-toggle { display: inline-flex; }
  .header-actions .btn { display: none; }

  .hero { padding: 60px 0 50px; }
  .hero-meta {
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 20px;
  }
  .hero-meta > div {
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border);
  }
  .hero-meta > div:last-child { padding-bottom: 0; border-bottom: 0; }

  .quick-cats, .tools-section { padding: 50px 0; }
  .content-section { padding: 40px 0 50px; }

  .section-head { flex-direction: column; align-items: flex-start; }

  .newsletter-card { padding: 40px 24px; }
  .newsletter-form { flex-direction: column; }
  .newsletter-form input { width: 100%; }
  .newsletter-form .btn { width: 100%; }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-bottom: 32px;
  }

  .article-cover { height: 220px; font-size: 64px; }
  .article-hero { padding: 80px 0 40px; }
}

@media (max-width: 480px) {
  .hero-cta { flex-direction: column; }
  .hero-cta .btn { width: 100%; }
  .cats-grid { grid-template-columns: 1fr 1fr; }
  .posts-grid { grid-template-columns: 1fr; }
}

/* ============================================
   Accessibility
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .orb { animation: none !important; }
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Loading skeleton */
.skeleton {
  background: linear-gradient(90deg, var(--surface), var(--surface-2), var(--surface));
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}