:root {
  --bg: #0f172a;
  --bg-soft: #1e293b;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --border: #e2e8f0;
  --text: #0f172a;
  --muted: #64748b;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-soft: #dbeafe;
  --success: #16a34a;
  --warn: #d97706;
  --danger: #dc2626;
  --radius: 12px;
  --shadow: 0 4px 16px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.12);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  color: var(--text);
  background: var(--surface-2);
  line-height: 1.5;
}

code {
  background: #eef2ff;
  color: #312e81;
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 60%, #4f46e5 100%);
  color: #fff;
  padding: 56px 24px 72px;
  text-align: center;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 8px;
}

.logo {
  display: inline-grid;
  place-items: center;
  width: 48px;
  height: 48px;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
  font-size: 14px;
}

.hero h1 {
  margin: 0;
  font-size: 1.85rem;
  font-weight: 600;
}

.tagline {
  margin: 8px auto 0;
  max-width: 540px;
  opacity: 0.85;
  font-size: 1rem;
}

/* ---------- Layout ---------- */
.container {
  max-width: 720px;
  margin: -36px auto 56px;
  padding: 0 20px;
  display: grid;
  gap: 20px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.card-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.card-head h2 {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 600;
}

.step {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 700;
  font-size: 0.85rem;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.15s ease;
}

.btn.primary {
  background: var(--primary);
  color: #fff;
}

.btn.primary:hover:not(:disabled) {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn.block {
  width: 100%;
  margin-top: 16px;
}

/* ---------- File pickers ---------- */
.file-pick {
  display: block;
  margin-top: 12px;
}

.file-pick span {
  display: block;
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 6px;
}

input[type=file] {
  width: 100%;
  padding: 8px;
  border: 1px dashed var(--border);
  border-radius: 8px;
  background: var(--surface-2);
  font-size: 0.9rem;
}

.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 36px 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.15s ease;
  background: var(--surface-2);
}

.dropzone:hover,
.dropzone:focus {
  border-color: var(--primary);
  background: #f0f5ff;
  outline: none;
}

.dropzone.dragover {
  border-color: var(--primary);
  background: var(--primary-soft);
  transform: scale(1.01);
}

.dropzone.has-file {
  border-style: solid;
  border-color: var(--success);
  background: #f0fdf4;
}

.dz-icon {
  font-size: 2.2rem;
  color: var(--primary);
  margin-bottom: 8px;
}

.dz-prompt {
  margin: 0;
  font-size: 1rem;
}

.dz-meta {
  margin: 6px 0 0;
  font-size: 0.85rem;
  color: var(--muted);
}

/* ---------- Status / progress ---------- */
.status {
  margin: 0;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 0.9rem;
}

.status.ok   { background: #ecfdf5; color: var(--success); border: 1px solid #a7f3d0; }
.status.warn { background: #fffbeb; color: var(--warn);    border: 1px solid #fde68a; }
.status.err  { background: #fef2f2; color: var(--danger);  border: 1px solid #fecaca; }

.progress {
  margin-top: 18px;
}

.progress.hidden,
.result.hidden { display: none; }

.bar {
  height: 8px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
}

.bar .fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--primary), #4f46e5);
  border-radius: 999px;
  transition: width 0.3s ease;
}

.progress-label {
  margin-top: 6px;
  font-size: 0.85rem;
  color: var(--muted);
  text-align: center;
}

.result {
  margin-top: 18px;
  display: grid;
  gap: 10px;
}

.result .stats {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.stat {
  flex: 1 1 100px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  text-align: center;
}

.stat .num {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.stat .lbl {
  font-size: 0.8rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.errors-list {
  margin: 0;
  padding-left: 18px;
  font-size: 0.88rem;
  color: var(--danger);
  max-height: 180px;
  overflow-y: auto;
}

/* ---------- Footer / meta ---------- */
.meta {
  margin: 4px 4px 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.meta summary {
  cursor: pointer;
  padding: 4px 0;
}

.meta ul {
  margin: 8px 0 0;
  padding-left: 20px;
}

footer {
  text-align: center;
  padding: 24px;
  color: var(--muted);
  font-size: 0.85rem;
}

@media (max-width: 600px) {
  .hero { padding: 40px 16px 56px; }
  .hero h1 { font-size: 1.4rem; }
  .container { padding: 0 14px; }
  .card { padding: 18px; }
}