:root {
  --bg-primary: #0f1115;
  --bg-secondary: #1a1d24;
  --bg-elevated: #232834;
  --text-primary: #e8eaf0;
  --text-secondary: #a0a4b0;
  --text-muted: #6d7280;
  --border-color: #2c313c;
  --accent-primary: #5b8def;
  --accent-hover: #7aa1f2;
  --danger: #e56b6b;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.2);
  --shadow-md: 0 4px 12px rgba(0,0,0,.3);
}

:root[data-theme="light"] {
  --bg-primary: #f7f8fb;
  --bg-secondary: #ffffff;
  --bg-elevated: #ffffff;
  --text-primary: #1a1d24;
  --text-secondary: #4a4f5a;
  --text-muted: #8a8f9a;
  --border-color: #e3e5ea;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,.08);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
}

.shell-container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.shell-header { padding: 48px 0 32px; border-bottom: 1px solid var(--border-color); }
.shell-title { font-size: 28px; margin: 0 0 8px; }
.shell-sub { color: var(--text-secondary); margin: 0 0 20px; max-width: 680px; }
.shell-actions { display: flex; gap: 12px; flex-wrap: wrap; }

.shell-main { padding: 32px 24px 64px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font: inherit;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: background .15s, border-color .15s;
}
.btn-primary { background: var(--accent-primary); color: white; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary { background: var(--bg-elevated); color: var(--text-primary); border-color: var(--border-color); }
.btn-secondary:hover { border-color: var(--accent-primary); }
.btn-ghost { background: transparent; color: var(--text-secondary); }
.btn-ghost:hover { color: var(--text-primary); background: var(--bg-elevated); }
.btn-danger { background: var(--danger); color: white; }

.blocks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.block-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: border-color .15s, transform .15s;
}
.block-card:hover { border-color: var(--accent-primary); transform: translateY(-2px); }
.block-card__preview {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--bg-elevated) center / cover no-repeat;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 13px;
  border-bottom: 1px solid var(--border-color);
}
.block-card__body { padding: 16px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.block-card__title { font-size: 16px; font-weight: 600; margin: 0; }
.block-card__desc { color: var(--text-secondary); font-size: 13px; margin: 0; flex: 1; }
.block-card__meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .05em;
}
.block-card__tag {
  background: var(--bg-elevated);
  padding: 2px 8px;
  border-radius: 999px;
}
.block-card__actions { display: flex; gap: 8px; padding: 12px 16px; border-top: 1px solid var(--border-color); }

.blocks-empty { color: var(--text-muted); text-align: center; padding: 48px 0; }
.blocks-error { color: var(--danger); text-align: center; padding: 48px 0; }

.shell-footer { padding: 24px 0 48px; color: var(--text-muted); }
.shell-footer a { color: var(--text-secondary); }

.block-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-color);
  background: var(--bg-secondary);
  text-align: center;
  font-size: 12px;
}

.block-footer__link {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color .15s;
}

.block-footer__link:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}