:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #1a2027;
  --muted: #5c6670;
  --border: #e2e6ea;
  --accent: #2563eb;
  --error: #dc2626;
  --warn: #d97706;
  --info: #2563eb;
  --radius: 10px;
  font-size: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.site-header { text-align: center; padding: 3rem 1rem 1.5rem; }
.site-header h1 { margin: 0; font-size: 2rem; letter-spacing: -0.02em; }
.tagline { color: var(--muted); margin: 0.4rem 0 0; }

main { max-width: 960px; margin: 0 auto; padding: 0 1rem 4rem; }

#check-form { display: flex; gap: 0.5rem; margin: 1rem 0 1.5rem; }
#url-input {
  flex: 1;
  padding: 0.7rem 0.9rem;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}
#url-input:focus { outline: 2px solid var(--accent); border-color: transparent; }
#check-button {
  padding: 0.7rem 1.4rem;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
}
#check-button:disabled { opacity: 0.6; cursor: wait; }

.status { padding: 0.8rem 1rem; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--border); }
.status.error { border-color: var(--error); color: var(--error); }

.http-banner {
  padding: 0.6rem 1rem;
  border-radius: var(--radius);
  background: #fef3c7;
  border: 1px solid var(--warn);
  margin-bottom: 1rem;
}

h2 { font-size: 1.15rem; margin: 1.8rem 0 0.8rem; }

.previews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 1rem;
}

.preview-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.preview-card .platform-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  padding: 0.5rem 0.9rem;
  border-bottom: 1px solid var(--border);
}
.preview-card .card-body { padding: 0.9rem; }

.pv-image {
  width: 100%;
  aspect-ratio: 1.91 / 1;
  object-fit: cover;
  display: block;
  background: #eceff2;
}
.pv-noimage {
  width: 100%;
  aspect-ratio: 1.91 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: repeating-linear-gradient(45deg, #eceff2 0 12px, #e4e8ec 12px 24px);
  color: var(--muted);
  font-size: 0.85rem;
}
.pv-domain { font-size: 0.78rem; color: var(--muted); text-transform: uppercase; }
.pv-title { font-weight: 600; margin: 0.15rem 0; overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.pv-desc { font-size: 0.86rem; color: var(--muted); overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }

/* Google */
.pv-google .g-url { font-size: 0.8rem; color: #0c6b2e; display: flex; align-items: center; gap: 0.4rem; }
.pv-google .g-favicon { width: 18px; height: 18px; border-radius: 50%; background: #eceff2; }
.pv-google .g-title { color: #1a0dab; font-size: 1.05rem; font-weight: 400; margin: 0.15rem 0; }
.pv-google .g-desc { font-size: 0.85rem; color: #4d5156; }

/* Slack */
.pv-slack .card-body { border-left: 4px solid var(--border); margin: 0.9rem; padding: 0 0 0 0.8rem; }
.pv-slack .s-site { display: flex; align-items: center; gap: 0.4rem; font-size: 0.82rem; font-weight: 700; }
.pv-slack .s-favicon { width: 16px; height: 16px; }
.pv-slack .s-title { color: #1264a3; font-weight: 700; margin: 0.2rem 0; }
.pv-slack .pv-image, .pv-slack .pv-noimage { border-radius: 8px; margin-top: 0.5rem; max-width: 360px; }

.findings { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.6rem; }
.finding {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left-width: 4px;
  border-radius: var(--radius);
  padding: 0.7rem 0.9rem;
}
.finding.error { border-left-color: var(--error); }
.finding.warn { border-left-color: var(--warn); }
.finding.info { border-left-color: var(--info); }
.finding .sev {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 4px;
  padding: 0.1rem 0.45rem;
  margin-right: 0.5rem;
}
.finding.error .sev { background: #fee2e2; color: var(--error); }
.finding.warn .sev { background: #fef3c7; color: var(--warn); }
.finding.info .sev { background: #dbeafe; color: var(--info); }
.finding pre {
  background: #0f172a;
  color: #e2e8f0;
  padding: 0.6rem 0.8rem;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.82rem;
  margin: 0.6rem 0 0;
}
.finding .copy-btn {
  float: right;
  font-size: 0.78rem;
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.15rem 0.6rem;
  cursor: pointer;
  color: var(--muted);
}
.finding .copy-btn:hover { border-color: var(--accent); color: var(--accent); }

.all-clear {
  background: #ecfdf5;
  border: 1px solid #10b981;
  color: #065f46;
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
  font-weight: 600;
}

.site-footer { text-align: center; color: var(--muted); font-size: 0.85rem; padding: 2rem 1rem; }
.site-footer a { color: var(--accent); }

@media (max-width: 560px) {
  #check-form { flex-direction: column; }
}