:root {
  --bg: #f4f6fb;
  --panel: #ffffff;
  --border: #dde3ee;
  --text: #1f2937;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --ok: #16a34a;
  --fail: #dc2626;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.08), 0 4px 16px rgba(16, 24, 40, 0.06);
}

* { box-sizing: border-box; }

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

/* ---------- Header / footer ---------- */
.app-header {
  position: relative;
  padding: 20px 28px 14px;
  background: linear-gradient(120deg, #1e3a8a, #2563eb);
  color: #fff;
}
.app-header h1 { margin: 0; font-size: 1.5rem; letter-spacing: 0.3px; }
.app-header .subtitle { margin: 4px 0 0; opacity: 0.85; font-size: 0.9rem; }
.service-pill {
  position: absolute; right: 28px; top: 24px;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 999px;
  padding: 4px 14px;
  font-size: 0.8rem;
}
.service-pill.ok { background: rgba(22, 163, 74, 0.85); border-color: transparent; }
.service-pill.bad { background: rgba(220, 38, 38, 0.85); border-color: transparent; }

.app-footer {
  padding: 14px 28px 24px;
  color: var(--muted);
  font-size: 0.8rem;
  text-align: center;
}

/* ---------- Layout ---------- */
.layout {
  display: grid;
  grid-template-columns: minmax(340px, 460px) 1fr;
  gap: 20px;
  padding: 20px 28px;
  align-items: start;
}
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}
.panel h2 { margin: 0 0 14px; font-size: 1.05rem; }
.panel h3 { margin: 18px 0 8px; font-size: 0.95rem; }

/* ---------- Form ---------- */
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 0.82rem; font-weight: 600; margin-bottom: 5px; color: #374151; }
.req { color: var(--fail); }

input[type="text"], input[type="number"], select, textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 7px;
  font: inherit;
  background: #fff;
  color: var(--text);
}
input:focus, select:focus, textarea:focus {
  outline: 2px solid rgba(37, 99, 235, 0.35);
  border-color: var(--accent);
}
textarea { resize: vertical; font-family: Consolas, "Courier New", monospace; font-size: 0.9rem; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

.radio-row { display: flex; gap: 18px; padding: 6px 0; }
.radio-row label { display: flex; align-items: center; gap: 6px; font-weight: 400; font-size: 0.9rem; margin: 0; }

.color-row { display: flex; gap: 8px; align-items: stretch; }
.color-row input[type="text"] { flex: 1; }
.color-row input[type="color"] {
  width: 42px; padding: 2px; border: 1px solid var(--border); border-radius: 7px; background: #fff; cursor: pointer;
}
.mini-btn {
  border: 1px solid var(--border); background: #f8fafc; border-radius: 7px;
  padding: 0 12px; cursor: pointer; font-size: 0.8rem; color: var(--muted);
}
.mini-btn:hover { background: #eef2f7; }

.presets { margin-top: 8px; display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.presets-label { font-size: 0.78rem; color: var(--muted); }
.chip {
  border: 1px solid var(--border); background: #f8fafc; color: #334155;
  border-radius: 999px; padding: 3px 12px; font-size: 0.78rem; cursor: pointer;
}
.chip:hover { border-color: var(--accent); color: var(--accent); }

.actions { display: flex; align-items: center; gap: 14px; margin-top: 6px; }
.primary-btn {
  display: inline-block;
  background: var(--accent); color: #fff; border: none; border-radius: 8px;
  padding: 9px 22px; font-size: 0.95rem; font-weight: 600; cursor: pointer;
  text-decoration: none;
}
.primary-btn:hover { background: var(--accent-dark); }
.primary-btn[disabled] { opacity: 0.6; cursor: wait; }
.form-error { color: var(--fail); font-size: 0.82rem; }

/* ---------- Result panel ---------- */
.empty-state { color: var(--muted); padding: 30px 0; text-align: center; font-size: 0.9rem; }
.hidden { display: none !important; }

.status-row { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.badge {
  border-radius: 6px; padding: 3px 12px; font-size: 0.8rem; font-weight: 700; color: #fff;
  background: var(--muted);
}
.badge.ok { background: var(--ok); }
.badge.fail { background: var(--fail); }
.result-message { font-size: 0.85rem; color: var(--muted); word-break: break-word; }

.metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.metric-card {
  border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px; background: #f8fafc;
}
.metric-label { font-size: 0.72rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.4px; }
.metric-value { font-size: 1.15rem; font-weight: 700; margin-top: 4px; font-family: Consolas, monospace; }

.previews { display: flex; gap: 16px; flex-wrap: wrap; }
.preview-box {
  margin: 0; border: 1px solid var(--border); border-radius: 8px;
  padding: 14px; min-width: 220px; max-width: 100%;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  overflow: auto;
}
.preview-box img { max-width: 100%; height: auto; }
.preview-box figcaption { font-size: 0.75rem; color: var(--muted); }
.preview-box.checker {
  background-image:
    linear-gradient(45deg, #e2e8f0 25%, transparent 25%, transparent 75%, #e2e8f0 75%),
    linear-gradient(45deg, #e2e8f0 25%, transparent 25%, transparent 75%, #e2e8f0 75%);
  background-size: 16px 16px;
  background-position: 0 0, 8px 8px;
}

.download-row { margin-top: 14px; }

/* ---------- Saved-file URL rows ---------- */
.url-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}
.url-row label {
  min-width: 36px;
  font-size: 0.82rem;
  font-weight: 600;
  color: #374151;
}
.url-row input[type="text"] {
  flex: 1;
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.82rem;
  background: #f8fafc;
  color: var(--text);
  cursor: text;
}

.raw-details { margin-top: 18px; font-size: 0.82rem; }
.raw-details summary { cursor: pointer; color: var(--accent); }
.raw-details pre {
  background: #0f172a; color: #e2e8f0; border-radius: 8px;
  padding: 12px; overflow: auto; font-size: 0.78rem; line-height: 1.5;
}

/* ---------- Spinner ---------- */
.spinner { display: flex; align-items: center; gap: 10px; color: var(--muted); margin-top: 20px; }
.spinner div {
  width: 18px; height: 18px; border-radius: 50%;
  border: 3px solid var(--border); border-top-color: var(--accent);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }