:root {
  color-scheme: light dark;
  --bg: #0f172a;
  --card: #111827;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --accent: #60a5fa;
  --danger: #f87171;
  --success: #4ade80;
  --border: rgba(255, 255, 255, 0.08);
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at 20% 20%, rgba(96, 165, 250, 0.08), transparent 25%),
    radial-gradient(circle at 80% 0%, rgba(74, 222, 128, 0.08), transparent 25%),
    var(--bg);
  color: var(--text);
  padding: 2.5rem 1.5rem 3rem;
  line-height: 1.6;
}

header {
  text-align: center;
  max-width: 900px;
  margin: 0 auto 2rem;
}

h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(2rem, 4vw, 2.75rem);
}

h2 {
  margin: 0 0 0.5rem;
  font-size: 1.35rem;
}

main {
  max-width: 980px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.card {
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.25rem 1.5rem;
  box-shadow: 0 15px 50px rgba(0, 0, 0, 0.35);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  align-items: start;
}

ul {
  margin: 0.25rem 0 0;
  padding-left: 1.25rem;
  color: var(--muted);
}

button {
  appearance: none;
  border: none;
  background: linear-gradient(135deg, #2563eb, #22c55e);
  color: #0b1220;
  padding: 0.75rem 1.2rem;
  border-radius: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.2s ease;
  box-shadow: 0 10px 30px rgba(96, 165, 250, 0.35);
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 12px 36px rgba(96, 165, 250, 0.45);
}

button:active:not(:disabled) {
  transform: translateY(0);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.5rem 1rem;
  margin: 1rem 0 0;
}

.meta dt {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.1rem;
}

.meta dd {
  margin: 0;
  font-weight: 700;
}

.file-picker {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border: 1px dashed var(--border);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.02);
  cursor: pointer;
  color: var(--text);
}

.file-picker input {
  display: none;
}

#file-label {
  font-weight: 700;
}

.helper {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.upload-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.progress {
  position: relative;
  margin: 1rem 0;
  height: 16px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--border);
}

#progress-bar {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 0%;
  background: linear-gradient(135deg, #22c55e, #2563eb);
  transition: width 0.2s ease;
}

#progress-label {
  display: block;
  margin-top: 0.35rem;
  color: var(--muted);
  font-weight: 600;
}

.log {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.75rem 0.9rem;
  min-height: 120px;
  font-family: "SFMono-Regular", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  color: var(--muted);
  overflow-y: auto;
  max-height: 280px;
}

.log p {
  margin: 0.15rem 0;
}

.log .info { color: var(--muted); }
.log .success { color: var(--success); }
.log .error { color: var(--danger); }

footer {
  max-width: 900px;
  margin: 1.5rem auto 0;
  text-align: center;
  color: var(--muted);
}

.lede {
  color: var(--muted);
  margin: 0.25rem auto 0;
  max-width: 620px;
}

@media (max-width: 600px) {
  body { padding: 1.5rem 1rem; }
  .card { padding: 1rem 1.1rem; }
}