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

:root {
  --bg: #0a0a0a;
  --surface: #111111;
  --border: #1e1e1e;
  --text: #e8e8e8;
  --text-muted: #666;
  --text-dim: #999;
  --accent: #d4d4d4;
  --tag-bg: #181818;
  --tag-border: #2a2a2a;
  --tag-active-bg: #1e1e1e;
  --tag-active-border: #555;
  --title-hover: #fff;
  --font: "Inter", system-ui, sans-serif;
}

html {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  background: var(--bg);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 2.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s;
}

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

.nav-brand {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: color 0.2s;
}

.nav-brand:hover {
  color: #fff;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.1rem;
}

.nav-icon {
  color: var(--text-muted);
  display: flex;
  align-items: center;
  text-decoration: none;
  transition: color 0.2s, transform 0.2s;
}

.nav-icon:hover {
  color: var(--text);
  transform: translateY(-1px);
}

.hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 860px;
  margin: 0 auto;
  padding: 5rem 2.5rem 4rem;
  gap: 3rem;
}

.hero-text {
  flex: 1;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 2.8rem);
  font-weight: 600;
  color: #fff;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 0.75rem;
}

.hero-sub {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 300;
  max-width: 340px;
}

.hero-art {
  flex-shrink: 0;
  opacity: 0.85;
}

.hero-gif {
  width: 200px;
  height: 200px;
  object-fit: contain;
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-8px); }
}

.main {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 2.5rem 6rem;
}

.tag-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--border);
}

.tag {
  background: var(--tag-bg);
  border: 1px solid var(--tag-border);
  color: var(--text-dim);
  font-family: var(--font);
  font-size: 0.78rem;
  font-weight: 400;
  padding: 0.3rem 0.7rem;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.18s, border-color 0.18s, color 0.18s, transform 0.15s;
  letter-spacing: 0.02em;
}

.tag:hover {
  background: var(--tag-active-bg);
  border-color: var(--tag-active-border);
  color: var(--text);
  transform: translateY(-1px);
}

.tag.active {
  background: var(--tag-active-bg);
  border-color: var(--tag-active-border);
  color: var(--accent);
}

.post-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.post-item {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 2rem;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--border);
  transition: opacity 0.2s;
  animation: fadeIn 0.25s ease;
}

.post-item.hidden {
  display: none;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.post-body {
  flex: 1;
  min-width: 0;
}

.post-title {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
  display: inline-block;
  margin-bottom: 0.3rem;
  transition: color 0.18s;
  letter-spacing: -0.01em;
}

.post-title:hover {
  color: var(--title-hover);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(255,255,255,0.3);
}

.post-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 0.6rem;
  font-weight: 300;
  line-height: 1.5;
}

.post-tags {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.post-tag {
  font-size: 0.72rem;
  color: #666;
  background: #141414;
  border: 1px solid #222;
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  letter-spacing: 0.02em;
  transition: color 0.15s, border-color 0.15s;
}

.post-tag:hover {
  color: #999;
  border-color: #333;
}

.post-date {
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
  padding-top: 0.2rem;
  font-weight: 300;
  letter-spacing: 0.01em;
}

@media (max-width: 600px) {
  .nav {
    padding: 1rem 1.25rem;
  }

  .hero {
    flex-direction: column-reverse;
    padding: 3rem 1.25rem 2.5rem;
    gap: 1.5rem;
  }

  .hero-art {
    align-self: flex-end;
  }

  .hero-gif {
    width: 140px;
    height: 140px;
  }

  .main {
    padding: 0 1.25rem 4rem;
  }

  .post-item {
    flex-direction: column;
    gap: 0.5rem;
  }

  .post-date {
    padding-top: 0;
  }
}