/* =============================================
   TECHJOURNAL — Design System
   Aesthetic: Dark terminal / editorial brutalism
   ============================================= */

@import url('https://fonts.googleapis.com/css2?family=Space+Mono:ital,wght@0,400;0,700;1,400&family=Syne:wght@400;700;800;900&family=Inter:wght@300;400;500;600&display=swap');

/* ── TOKENS ───────────────────────────────── */
:root {
  --bg:          #080b10;
  --bg2:         #0d1117;
  --surface:     #111827;
  --surface2:    #1a2234;
  --border:      #1e2d42;
  --border2:     #243348;

  --cyan:        #00d4ff;
  --cyan-dim:    rgba(0, 212, 255, 0.15);
  --cyan-glow:   rgba(0, 212, 255, 0.07);
  --green:       #39d353;
  --amber:       #f0a500;
  --red:         #ff4757;
  --purple:      #9b59b6;

  --text:        #e2e8f0;
  --text-muted:  #64748b;
  --text-faint:  #334155;

  --font-display: 'Syne', sans-serif;
  --font-mono:    'Space Mono', monospace;
  --font-body:    'Inter', sans-serif;

  --ease:        cubic-bezier(0.4, 0, 0.2, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition:  all 0.3s var(--ease);
}

/* ── RESET ────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── BACKGROUND EFFECTS ───────────────────── */
.noise-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.025;
  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)'/%3E%3C/svg%3E");
  background-size: 200px 200px;
}

.grid-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(0,212,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 0%, black 40%, transparent 100%);
}

/* ── HEADER ───────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8, 11, 16, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.2rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-block {
  display: flex;
  align-items: baseline;
  gap: 0.2rem;
  flex-wrap: wrap;
}

.logo-bracket {
  font-family: var(--font-mono);
  color: var(--cyan);
  font-size: 1.5rem;
  font-weight: 700;
  opacity: 0.7;
}

.logo-text {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: -0.5px;
  color: var(--text);
}

.logo-accent {
  color: var(--cyan);
}

.logo-sub {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  margin-left: 0.8rem;
  align-self: center;
}

.header-meta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(57, 211, 83, 0.4); }
  50% { opacity: 0.7; box-shadow: 0 0 0 4px rgba(57, 211, 83, 0); }
}

.status-text {
  color: var(--green);
  letter-spacing: 1px;
}

.header-date {
  color: var(--text-faint);
  padding-left: 0.8rem;
  border-left: 1px solid var(--border);
}

.header-line {
  height: 1px;
  background: var(--border);
  overflow: hidden;
}

.header-line-fill {
  height: 100%;
  width: 30%;
  background: linear-gradient(90deg, var(--cyan), transparent);
  animation: line-move 4s ease-in-out infinite alternate;
}

@keyframes line-move {
  from { transform: translateX(-100%); }
  to { transform: translateX(400%); }
}

/* ── FILTER BAR ───────────────────────────── */
.filter-bar {
  position: relative;
  z-index: 1;
  border-bottom: 1px solid var(--border);
  background: var(--bg2);
}

.filter-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.filter-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--cyan);
  opacity: 0.7;
  white-space: nowrap;
}

.filter-tabs {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.filter-tab {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition);
}

.filter-tab:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

.filter-tab.active {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #000;
}

.post-count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-faint);
}

/* ── FEATURED SECTION ─────────────────────── */
.featured-section {
  position: relative;
  z-index: 1;
  max-width: 1400px;
  margin: 3rem auto 0;
  padding: 0 2rem;
}

.section-label, .featured-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--cyan);
  opacity: 0.6;
  letter-spacing: 2px;
  margin-bottom: 1rem;
}

.featured-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 340px;
  transition: var(--transition);
}

.featured-card:hover {
  border-color: var(--cyan);
  box-shadow: 0 0 40px var(--cyan-glow), 0 20px 40px rgba(0,0,0,0.4);
}

.featured-img-wrap {
  position: relative;
  overflow: hidden;
}

.featured-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.7) saturate(1.1);
  transition: transform 0.6s var(--ease), filter 0.6s var(--ease);
}

.featured-card:hover .featured-img-wrap img {
  transform: scale(1.05);
  filter: brightness(0.85) saturate(1.2);
}

.featured-img-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 60%, var(--surface) 100%);
  pointer-events: none;
}

.featured-body {
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1rem;
}

.featured-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--cyan);
  background: var(--cyan-dim);
  border: 1px solid rgba(0,212,255,0.3);
  padding: 0.3rem 0.7rem;
  border-radius: 3px;
  width: fit-content;
}

.featured-tag::before { content: '#'; opacity: 0.6; }

.featured-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--text);
}

.featured-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.featured-meta {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-faint);
}

.featured-meta .meta-views { color: var(--amber); }

.featured-read-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: var(--cyan);
  color: #000;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-decoration: none;
  border-radius: 6px;
  width: fit-content;
  transition: var(--transition);
}

.featured-read-btn:hover {
  background: #fff;
  transform: translateX(4px);
}

.featured-read-btn::after { content: '→'; }

/* ── POSTS GRID ───────────────────────────── */
.posts-section {
  position: relative;
  z-index: 1;
  max-width: 1400px;
  margin: 3rem auto;
  padding: 0 2rem;
}

.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

/* ── CARD ─────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  animation: card-in 0.4s var(--ease) both;
  position: relative;
}

@keyframes card-in {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.card:nth-child(1) { animation-delay: 0.05s; }
.card:nth-child(2) { animation-delay: 0.10s; }
.card:nth-child(3) { animation-delay: 0.15s; }
.card:nth-child(4) { animation-delay: 0.20s; }

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent);
  opacity: 0;
  transition: opacity 0.3s var(--ease);
}

.card:hover {
  border-color: var(--border2);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4), 0 0 0 1px rgba(0,212,255,0.1);
  transform: translateY(-4px);
}

.card:hover::before { opacity: 1; }

/* Card Image */
.card-img-wrap {
  position: relative;
  overflow: hidden;
  height: 190px;
}

.card-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.75) saturate(1.0);
  transition: transform 0.5s var(--ease), filter 0.5s var(--ease);
}

.card:hover .card-img-wrap img {
  transform: scale(1.06);
  filter: brightness(0.9) saturate(1.15);
}

.card-img-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(13,17,23,0.9) 0%, transparent 60%);
}

.card-category-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  padding: 0.25rem 0.6rem;
  border-radius: 3px;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.1);
  color: var(--cyan);
}

/* Card Body */
.card-body {
  padding: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  flex: 1;
}

.card-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.3;
}

.card-title a {
  color: var(--text);
  text-decoration: none;
  transition: color 0.2s;
}

.card-title a:hover { color: var(--cyan); }

.card-excerpt {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-footer {
  margin-top: auto;
  padding-top: 0.8rem;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.card-meta {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--text-faint);
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.card-views {
  color: var(--amber);
  font-size: 0.6rem;
}

.card-read-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--cyan);
  text-decoration: none;
  padding: 0.45rem 0.9rem;
  border: 1px solid rgba(0,212,255,0.3);
  border-radius: 4px;
  background: var(--cyan-dim);
  transition: var(--transition);
  white-space: nowrap;
}

.card-read-btn:hover {
  background: var(--cyan);
  color: #000;
  border-color: var(--cyan);
}

/* ── EMPTY STATE ──────────────────────────── */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 4rem 2rem;
  font-family: var(--font-mono);
  color: var(--text-faint);
  font-size: 0.8rem;
}

.empty-state::before {
  content: '// NO POSTS FOUND';
  display: block;
  color: var(--cyan);
  margin-bottom: 0.5rem;
  opacity: 0.5;
}

/* ── POST PAGE ────────────────────────────── */
body.post-page { background: var(--bg); }

.post-topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8,11,16,0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0.9rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 100%;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  transition: var(--transition);
}

.back-btn:hover {
  color: var(--cyan);
  border-color: var(--cyan);
  background: var(--cyan-dim);
}

.back-arrow { font-size: 1rem; }

.topbar-logo {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--cyan);
}

.topbar-views {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--amber);
}

.post-wrapper {
  max-width: 780px;
  margin: 0 auto;
  padding: 3rem 2rem 4rem;
  position: relative;
  z-index: 1;
}

/* Post Article */
.post-article {}

.post-header {
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.post-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--cyan);
  background: var(--cyan-dim);
  border: 1px solid rgba(0,212,255,0.25);
  padding: 0.3rem 0.7rem;
  border-radius: 3px;
  margin-bottom: 1rem;
}

.post-tag::before { content: '#'; opacity: 0.6; }

.post-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 5vw, 3rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.5px;
  margin-bottom: 1.2rem;
  color: var(--text);
}

.post-meta-bar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-faint);
  flex-wrap: wrap;
}

.post-meta-bar .views { color: var(--amber); }

.post-hero-img {
  width: 100%;
  border-radius: 10px;
  margin-bottom: 2.5rem;
  border: 1px solid var(--border);
  filter: brightness(0.85) saturate(1.1);
}

/* Post Body Typography */
.post-body {
  font-size: 1rem;
  line-height: 1.85;
  color: #c8d3e1;
}

.post-body p {
  margin-bottom: 1.3rem;
}

.post-body h1, .post-body h2, .post-body h3 {
  font-family: var(--font-display);
  font-weight: 800;
  color: var(--text);
  margin: 2rem 0 0.8rem;
  line-height: 1.2;
}

.post-body h1 { font-size: 1.8rem; }
.post-body h2 { font-size: 1.4rem; }
.post-body h3 { font-size: 1.1rem; color: var(--cyan); }

.post-body ul, .post-body ol {
  margin: 1.2rem 0 1.2rem 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.post-body li {
  position: relative;
  padding: 0.6rem 0.8rem 0.6rem 1.2rem;
  color: #a8b6cc;
  font-size: 0.93rem;
  border-left: 2px solid var(--border2);
  background: var(--surface);
  border-radius: 0 6px 6px 0;
  transition: border-color 0.2s;
}

.post-body li:hover { border-left-color: var(--cyan); }

.post-body li strong {
  color: var(--cyan);
  font-weight: 600;
}

.post-body img {
  width: 100%;
  border-radius: 8px;
  margin: 1.5rem 0;
  border: 1px solid var(--border);
  filter: brightness(0.85);
}

.post-body strong { color: var(--text); font-weight: 600; }
.post-body em { color: var(--amber); font-style: italic; }

.post-body code {
  font-family: var(--font-mono);
  font-size: 0.82em;
  background: var(--surface2);
  color: var(--green);
  padding: 0.1em 0.45em;
  border-radius: 3px;
  border: 1px solid var(--border);
}

/* Post end */
.post-end {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.post-end-meta {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-faint);
}

.post-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 1px;
  color: #000;
  background: var(--cyan);
  text-decoration: none;
  padding: 0.6rem 1.2rem;
  border-radius: 6px;
  transition: var(--transition);
}

.post-back-btn:hover {
  background: #fff;
  transform: translateX(-4px);
}

/* ── FOOTER ───────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg2);
  position: relative;
  z-index: 1;
}

.footer-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-logo {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--cyan);
  opacity: 0.6;
}

.footer-info {
  font-size: 0.78rem;
  color: var(--text-faint);
  display: flex;
  gap: 0.6rem;
}

.footer-sep { opacity: 0.3; }

.footer-mono {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-faint);
}

.accent { color: var(--cyan); }

/* ── SCROLLBAR ────────────────────────────── */
::-webkit-scrollbar { width: 6px; background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--cyan); }

/* ── RESPONSIVE ───────────────────────────── */
@media (max-width: 900px) {
  .featured-card {
    grid-template-columns: 1fr;
    min-height: auto;
  }
  .featured-img-wrap {
    height: 220px;
  }
  .featured-img-overlay {
    background: linear-gradient(to top, var(--surface) 10%, transparent 60%);
  }
}

@media (max-width: 600px) {
  .header-inner { padding: 1rem; }
  .header-date { display: none; }
  .filter-inner { padding: 0.8rem 1rem; }
  .featured-section, .posts-section { padding: 0 1rem; }
  .featured-body { padding: 1.5rem; }
  .post-wrapper { padding: 2rem 1rem 3rem; }
  .post-topbar { padding: 0.8rem 1rem; }
  .footer-inner { padding: 1.5rem 1rem; flex-direction: column; align-items: flex-start; }
  .posts-grid { grid-template-columns: 1fr; }
}