:root {
  --bg: #0b0e14;
  --card: #141926;
  --card-2: #1a2032;
  --border: #2a3348;
  --text: #e8ecf4;
  --muted: #8b94a8;
  --accent: #4f9cf9;
  --accent-2: #7db8ff;
  --danger: #ff6b6b;
  --ok: #3ddc97;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.5;
}

.container {
  max-width: 640px;
  margin: 0 auto;
  padding: 32px 20px 48px;
}
.container.center { text-align: center; }

header { text-align: center; margin-bottom: 28px; }
.logo-line { margin: 0; font-size: 2rem; letter-spacing: 0.5px; }
.logo { filter: drop-shadow(0 0 12px rgba(79, 156, 249, 0.6)); }
.tagline { color: var(--muted); margin: 6px 0 0; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  margin-top: 20px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}

/* Drop zone */
.dropzone {
  border: 2px dashed var(--border);
  border-radius: 14px;
  padding: 44px 24px;
  text-align: center;
  transition: border-color 0.2s, background 0.2s;
}
.dropzone.dragover {
  border-color: var(--accent);
  background: rgba(79, 156, 249, 0.08);
}
.dz-icon { color: var(--accent); margin-bottom: 8px; }
.dz-text { color: var(--muted); margin: 0 0 18px; }

/* Buttons */
.btn {
  display: inline-block;
  background: var(--accent);
  color: #08111f;
  font-weight: 600;
  font-size: 1rem;
  padding: 10px 20px;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s, transform 0.05s;
}
.btn:hover { background: var(--accent-2); }
.btn:active { transform: scale(0.98); }
.btn.secondary {
  background: transparent;
  color: var(--accent-2);
  border: 1px solid var(--border);
}
.btn.secondary:hover { background: var(--card-2); }
.btn.big { font-size: 1.1rem; padding: 12px 32px; }
.btn.disabled { opacity: 0.4; pointer-events: none; }

/* Progress */
.bar {
  height: 10px;
  background: var(--card-2);
  border-radius: 999px;
  overflow: hidden;
  margin: 14px 0 8px;
}
#bar-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--ok));
  border-radius: 999px;
  transition: width 0.2s;
}

/* Result */
.result-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 24px;
  align-items: center;
  margin-top: 8px;
}
#qr {
  width: 220px;
  height: 220px;
  border-radius: 10px;
  background: #fff;
  padding: 8px;
  justify-self: center;
}
.url-row { display: flex; gap: 8px; }
#url {
  flex: 1;
  min-width: 0;
  background: var(--card-2);
  border: 1px solid var(--border);
  color: var(--accent-2);
  border-radius: 8px;
  padding: 10px 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9rem;
}
@media (max-width: 560px) {
  .result-grid { grid-template-columns: 1fr; }
}

/* Misc */
.file-name { font-weight: 600; font-size: 1.15rem; margin: 0 0 4px; word-break: break-all; }
.muted { color: var(--muted); }
.small { font-size: 0.85rem; }
.ttl { color: var(--ok); font-variant-numeric: tabular-nums; }
.error {
  background: rgba(255, 107, 107, 0.1);
  border: 1px solid rgba(255, 107, 107, 0.4);
  color: var(--danger);
  border-radius: 10px;
  padding: 12px 16px;
  margin-top: 20px;
}
footer { margin-top: 36px; text-align: center; }