:root {
  --bg: #0f1115;
  --card: #171a21;
  --muted: #8b93a7;
  --text: #e8ebf2;
  --accent: #4f8cff;
  --danger: #ff5c5c;
  --border: #262b36;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-tap-highlight-color: transparent;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(15, 17, 21, 0.9);
  backdrop-filter: blur(8px);
  z-index: 10;
}

.brand { font-weight: 700; text-decoration: none; color: var(--text); }
nav a { color: var(--muted); text-decoration: none; margin-left: 16px; }
nav a:hover { color: var(--text); }

main { max-width: 1000px; margin: 0 auto; padding: 20px 16px 60px; }

h1 { font-size: 1.4rem; margin: 0 0 6px; }
.muted { color: var(--muted); font-weight: 400; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  text-align: center;
}

.picker {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 140px;
  margin: 18px 0;
  border: 2px dashed var(--border);
  border-radius: 14px;
  color: var(--muted);
  cursor: pointer;
  transition: border-color .15s, color .15s;
}
.picker:hover { border-color: var(--accent); color: var(--text); }

.preview {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
  gap: 8px;
  margin-bottom: 18px;
}
.preview img { width: 100%; aspect-ratio: 1; object-fit: cover; border-radius: 8px; }

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: #222732;
  color: var(--text);
  padding: 11px 18px;
  border-radius: 10px;
  font-size: 1rem;
  cursor: pointer;
}
.btn:hover { border-color: var(--accent); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.danger { background: transparent; border-color: var(--danger); color: var(--danger); }

.gallery-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.bulk { display: flex; gap: 8px; flex-wrap: wrap; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: 8px;
}

.tile {
  position: relative;
  display: block;
  border-radius: 10px;
  overflow: hidden;
  cursor: pointer;
}
.tile img { width: 100%; aspect-ratio: 1; object-fit: cover; display: block; }
.tile input { position: absolute; opacity: 0; pointer-events: none; }

.tile .check {
  position: absolute;
  top: 8px; left: 8px;
  width: 24px; height: 24px;
  border-radius: 50%;
  border: 2px solid #fff;
  background: rgba(0,0,0,.35);
  transition: background .12s;
}
.tile input:checked ~ .check {
  background: var(--accent);
  border-color: var(--accent);
}
.tile input:checked ~ .check::after {
  content: "✓";
  color: #fff;
  font-size: 15px;
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
}
.tile input:checked ~ .view img { outline: 3px solid var(--accent); outline-offset: -3px; }