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

:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Light theme */
  --bg: #fafafa;
  --bg-elev: #ffffff;
  --bg-subtle: #f4f4f5;
  --border: #e4e4e7;
  --text: #18181b;
  --text-muted: #71717a;
  --text-subtle: #a1a1aa;
  --accent: #10b981;
  --accent-hover: #059669;
  --accent-glow: rgba(16, 185, 129, 0.15);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.08);
  --hero-grid: rgba(0,0,0,0.04);
  --card-hover: 0 16px 40px rgba(0,0,0,0.1);
}

[data-theme="dark"] {
  --bg: #0a0a0b;
  --bg-elev: #111113;
  --bg-subtle: #18181b;
  --border: #27272a;
  --text: #fafafa;
  --text-muted: #a1a1aa;
  --text-subtle: #71717a;
  --accent: #34d399;
  --accent-hover: #10b981;
  --accent-glow: rgba(52, 211, 153, 0.12);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
  --hero-grid: rgba(255,255,255,0.04);
  --card-hover: 0 16px 40px rgba(0,0,0,0.6);
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

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

/* ========== NAVBAR ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(250, 250, 250, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: all 0.3s ease;
}

[data-theme="dark"] .navbar {
  background: rgba(10, 10, 11, 0.8);
}

.navbar.scrolled {
  border-bottom-color: var(--border);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.02em;
}

.logo-icon {
  width: 24px;
  height: 24px;
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 8px;
}

.nav-link {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  transition: all 0.2s ease;
}

.nav-link:hover {
  color: var(--text);
  background: var(--bg-subtle);
}

.nav-link.active {
  color: var(--text);
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease;
}

.theme-toggle:hover {
  background: var(--bg-subtle);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.icon-sun { display: none; }
.icon-moon { display: block; }

[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }

.nav-burger {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}

.nav-burger span {
  width: 20px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s ease;
}

/* ========== HERO ========== */
.hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 24px 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--hero-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--hero-grid) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 40%, transparent 100%);
}

.hero-glow {
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(ellipse, var(--accent-glow) 0%, transparent 60%);
  filter: blur(60px);
  animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.6; transform: translateX(-50%) scale(1); }
  50% { opacity: 1; transform: translateX(-50%) scale(1.1); }
}

.hero-content {
  position: relative;
  text-align: center;
  max-width: 800px;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 28px;
}

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

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.hero-title {
  font-size: clamp(48px, 9vw, 104px);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.04em;
  margin-bottom: 24px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--accent) 0%, #06b6d4 50%, #a855f7 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.hero-subtitle {
  font-size: clamp(16px, 2vw, 19px);
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 auto 36px;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 56px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 8px 20px var(--accent-glow);
}

.btn-ghost {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--text);
}

.btn-ghost:hover {
  background: var(--bg-subtle);
  border-color: var(--text-subtle);
}

.hero-stats {
  display: flex;
  gap: 48px;
  justify-content: center;
  flex-wrap: wrap;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-number {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.02em;
  font-family: var(--font-mono);
}

.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ========== ARTICLES ========== */
.articles {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-title {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 17px;
}

.filter-bar {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.filter-btn {
  padding: 8px 16px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  border: 1px solid var(--border);
  background: var(--bg-elev);
  transition: all 0.2s ease;
}

.filter-btn:hover {
  color: var(--text);
  border-color: var(--text-subtle);
}

.filter-btn.active {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  transition: all 0.3s ease;
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--card-hover);
  border-color: var(--text-subtle);
}

.card.hidden {
  display: none;
}

.card-image {
  position: relative;
  height: 180px;
  background: linear-gradient(135deg, var(--accent) 0%, color-mix(in srgb, var(--accent) 60%, #000) 100%);
  overflow: hidden;
}

.card-pattern {
  position: absolute;
  inset: 0;
  opacity: 0.25;
}

.pattern-linux {
  background-image:
    radial-gradient(circle at 20% 30%, rgba(255,255,255,0.3) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(255,255,255,0.2) 0%, transparent 40%);
}

.pattern-community {
  background-image:
    repeating-linear-gradient(45deg, transparent 0 20px, rgba(255,255,255,0.1) 20px 21px);
}

.pattern-devops {
  background-image:
    linear-gradient(rgba(255,255,255,0.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.1) 1px, transparent 1px);
  background-size: 24px 24px;
}

.pattern-security {
  background-image:
    radial-gradient(circle at 50% 50%, rgba(255,255,255,0.15) 2px, transparent 3px);
  background-size: 20px 20px;
}

.pattern-ai {
  background-image:
    radial-gradient(circle at 30% 40%, rgba(255,255,255,0.2) 0%, transparent 50%),
    radial-gradient(circle at 70% 60%, rgba(255,255,255,0.15) 0%, transparent 50%);
}

.pattern-tools {
  background-image:
    repeating-linear-gradient(-45deg, transparent 0 15px, rgba(255,255,255,0.08) 15px 16px),
    repeating-linear-gradient(45deg, transparent 0 15px, rgba(255,255,255,0.08) 15px 16px);
}

.card-tag {
  position: absolute;
  top: 16px;
  left: 16px;
  padding: 4px 10px;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(8px);
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  color: #fff;
  letter-spacing: 0.02em;
}

.card-body {
  padding: 22px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-title {
  font-size: 19px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin-bottom: 10px;
}

.card-excerpt {
  font-size: 14.5px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex: 1;
}

.card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.card-author {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--bg);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  flex-shrink: 0;
  background: var(--bg, #888);
}

.card-author > div {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.author-name {
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.meta-date {
  font-size: 12px;
  color: var(--text-subtle);
}

.read-time {
  font-size: 12px;
  color: var(--text-subtle);
  font-family: var(--font-mono);
  white-space: nowrap;
  flex-shrink: 0;
}

/* ========== ABOUT ========== */
.about {
  padding: 100px 0;
  background: var(--bg-subtle);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 64px;
  align-items: center;
}

.about-text {
  font-size: 16.5px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-top: 20px;
}

.about-text strong {
  color: var(--text);
}

.about-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 40px;
  text-align: center;
}

.about-card-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.about-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: var(--accent-glow);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-icon svg {
  width: 32px;
  height: 32px;
}

.about-card h3 {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.about-card p {
  color: var(--text-muted);
  font-size: 15px;
}

.about-card .btn {
  margin-top: 8px;
}

.about-card .btn svg {
  width: 18px;
  height: 18px;
}

/* ========== FOOTER ========== */
.footer {
  padding: 64px 0 32px;
  background: var(--bg);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 14px;
  margin-top: 12px;
  max-width: 280px;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col h4 {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-subtle);
  margin-bottom: 4px;
}

.footer-col a {
  font-size: 14px;
  color: var(--text-muted);
  transition: color 0.2s ease;
}

.footer-col a:hover {
  color: var(--text);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-subtle);
  flex-wrap: wrap;
  gap: 12px;
}

.heart {
  color: #ef4444;
  display: inline-block;
  animation: heartbeat 1.5s ease-in-out infinite;
}

@keyframes heartbeat {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.15); }
}

/* ========== RESPONSIVE ========== */
@media (max-width: 960px) {
  .cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-elev);
    border-bottom: 1px solid var(--border);
    padding: 12px;
    gap: 2px;
  }
  .nav-links.open {
    display: flex;
  }
  .nav-burger {
    display: flex;
  }
  .cards-grid {
    grid-template-columns: 1fr;
  }
  .hero {
    padding: 100px 20px 60px;
    min-height: 80vh;
  }
  .hero-stats {
    gap: 32px;
  }
  .stat-number {
    font-size: 24px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  .articles, .about {
    padding: 64px 0;
  }
}

/* ========== REDUCED MOTION ========== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}