/* ── Variables ───────────────────────────────────────────── */
:root {
  --bg:       #f4f4f4;
  --surface:  #ffffff;
  --text:     #111111;
  --muted:    #666666;
  --accent:   #e0245e;
  --nav-bg:   #ffffff;
  --border:   #e0e0e0;
  --overlay:  rgba(0,0,0,0.85);
  --gap:      8px;
  --col-width: 280px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:      #0f0f0f;
    --surface: #1a1a1a;
    --text:    #f0f0f0;
    --muted:   #888888;
    --accent:  #ff4d80;
    --nav-bg:  #111111;
    --border:  #2a2a2a;
  }
}

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

html { font-size: 15px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, sans-serif;
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; }
img, video { display: block; width: 100%; height: auto; }

/* ── Nav ─────────────────────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.6rem 1.2rem;
  flex-wrap: wrap;
}

.brand {
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  color: var(--accent);
  flex-shrink: 0;
}
.brand:hover { text-decoration: none; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-left: auto;
}

.nav-blogname {
  font-size: 0.85rem;
  color: var(--muted);
}

.type-filter { display: flex; gap: 0.4rem; }
.type-filter a {
  font-size: 0.8rem;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
  transition: all 0.15s;
}
.type-filter a.active,
.type-filter a:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  text-decoration: none;
}

.search-form input {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text);
  font-size: 0.8rem;
  padding: 0.25rem 0.75rem;
  outline: none;
  width: 160px;
  transition: border-color 0.15s, width 0.2s;
}
.search-form input:focus {
  border-color: var(--accent);
  width: 200px;
}

.nav-logout {
  font-size: 0.8rem;
  color: var(--muted);
}

/* ── Main / Grid ─────────────────────────────────────────── */
main { padding: var(--gap); }

.page-header {
  font-size: 1rem;
  font-weight: 500;
  color: var(--muted);
  padding: 0.75rem 0.25rem 0.5rem;
}

/* True CSS masonry using column-count */
.masonry-grid {
  column-count: auto;
  column-width: var(--col-width);
  column-gap: var(--gap);
}

.post-card {
  break-inside: avoid;
  margin-bottom: var(--gap);
  background: var(--surface);
  border-radius: 4px;
  overflow: hidden;
  cursor: pointer;
  position: relative;
  transition: transform 0.15s, box-shadow 0.15s;
}

.post-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

@media (prefers-color-scheme: dark) {
  .post-card:hover {
    box-shadow: 0 6px 20px rgba(0,0,0,0.5);
  }
}

.post-card img,
.post-card video {
  width: 100%;
  height: auto;
  display: block;
}

.post-card .post-meta {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0.4rem 0.6rem;
  background: linear-gradient(transparent, rgba(0,0,0,0.6));
  display: flex;
  align-items: center;
  justify-content: space-between;
  opacity: 0;
  transition: opacity 0.15s;
}

.post-card:hover .post-meta { opacity: 1; }

.post-meta .blog-name {
  font-size: 0.75rem;
  color: #fff;
  font-weight: 500;
}

.post-meta .note-count {
  font-size: 0.7rem;
  color: rgba(255,255,255,0.75);
}

/* ── Loader / Sentinel ───────────────────────────────────── */
.loader {
  display: flex;
  justify-content: center;
  gap: 6px;
  padding: 2rem;
}
.loader span {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: bounce 0.9s infinite alternate;
}
.loader span:nth-child(2) { animation-delay: 0.2s; }
.loader span:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
  from { opacity: 0.3; transform: translateY(0); }
  to   { opacity: 1;   transform: translateY(-6px); }
}

.hidden { display: none !important; }

.end-message {
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
  padding: 2rem;
}

#sentinel { height: 100px; }

/* ── Lightbox ────────────────────────────────────────────── */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: var(--overlay);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.lightbox-media {
  max-width: 90vw;
  max-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-media img,
.lightbox-media video {
  max-width: 90vw;
  max-height: 80vh;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 2px;
}

.lightbox-close {
  position: absolute;
  top: 1rem; right: 1rem;
  background: none; border: none;
  color: #fff; font-size: 1.5rem;
  cursor: pointer; opacity: 0.7;
  transition: opacity 0.15s;
}
.lightbox-close:hover { opacity: 1; }

.lightbox-prev,
.lightbox-next {
  position: absolute;
  top: 50%; transform: translateY(-50%);
  background: rgba(255,255,255,0.1);
  border: none; color: #fff;
  font-size: 2rem; width: 2.5rem; height: 5rem;
  cursor: pointer; border-radius: 4px;
  transition: background 0.15s;
  display: flex; align-items: center; justify-content: center;
}
.lightbox-prev { left: 1rem; }
.lightbox-next { right: 1rem; }
.lightbox-prev:hover,
.lightbox-next:hover { background: rgba(255,255,255,0.2); }

.lightbox-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

.lightbox-actions button,
.lightbox-actions a {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  color: #fff;
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: background 0.15s;
  text-decoration: none;
}
.lightbox-actions button:hover,
.lightbox-actions a:hover { background: rgba(255,255,255,0.25); }

.btn-like.liked { color: var(--accent); border-color: var(--accent); }