* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: #f4f5f7;
  color: #1f2937;
  line-height: 1.5;
}
.topbar {
  background: #111827;
  color: white;
  padding: 12px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.topbar .brand { color: white; text-decoration: none; font-weight: 600; }
.topbar .link { color: #9ca3af; text-decoration: none; }
.topbar .link:hover { color: white; }
.container { max-width: 900px; margin: 24px auto; padding: 0 16px; }
.foot { text-align: center; color: #9ca3af; font-size: 12px; padding: 30px 0; }

.card {
  background: white;
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}
.card h1 { margin-top: 0; }
.card h2 { margin-top: 0; font-size: 16px; color: #4b5563; }

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.grid .wide { grid-column: 1 / -1; }
@media (max-width: 640px) {
  .grid { grid-template-columns: 1fr; }
}

label { display: block; margin-bottom: 12px; font-size: 14px; color: #4b5563; }
input[type=text], input[type=password] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font-size: 15px;
  margin-top: 4px;
}
input:focus { outline: none; border-color: #2563eb; box-shadow: 0 0 0 3px rgba(37,99,235,0.15); }

button, .btn {
  background: #2563eb;
  color: white;
  border: none;
  padding: 9px 18px;
  border-radius: 8px;
  font-size: 15px;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  margin: 4px 4px 4px 0;
}
button:hover, .btn:hover { background: #1d4ed8; }

.err {
  background: #fef2f2;
  color: #b91c1c;
  padding: 10px 12px;
  border-radius: 8px;
  margin-bottom: 12px;
  font-size: 14px;
}
.ok {
  background: #f0fdf4;
  color: #15803d;
  padding: 10px 12px;
  border-radius: 8px;
  margin-bottom: 12px;
  font-size: 14px;
}
.muted { color: #9ca3af; font-size: 13px; }

.tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 12px;
  background: #e5e7eb;
  color: #374151;
}
.tag.ok { background: #dcfce7; color: #15803d; }
.tag.hold { background: #fef3c7; color: #92400e; }
.tag.err { background: #fee2e2; color: #b91c1c; }

.usage-bar {
  height: 10px;
  background: #e5e7eb;
  border-radius: 5px;
  overflow: hidden;
  margin: 8px 0;
}
.usage-bar span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, #10b981 0%, #3b82f6 100%);
  transition: width 0.3s;
}

.sub-url {
  display: flex;
  gap: 8px;
  margin: 12px 0;
}
.sub-url input {
  flex: 1;
  font-family: monospace;
  font-size: 12px;
}
.sub-url button {
  flex-shrink: 0;
  margin: 0;
}

.qr-block {
  display: flex;
  gap: 20px;
  margin: 16px 0;
  flex-wrap: wrap;
}
.qr-item { text-align: center; }
.qr-item img {
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: white;
  padding: 8px;
}
.qr-item p { font-size: 12px; color: #6b7280; margin: 8px 0 0; }

.dl-block { margin-top: 12px; }
.dl-block .btn {
  background: #6b7280;
  font-size: 13px;
  padding: 7px 12px;
}
.dl-block .btn:hover { background: #4b5563; }

/* v2 additions */
.btn.small { padding:4px 10px; font-size:12px; }
.plan-block {
  padding: 12px 14px;
  border-radius: 10px;
  background: #f9fafb;
  margin: 8px 0;
  line-height: 1.7;
  font-size: 14px;
  border-left: 4px solid #3b82f6;
}
.plan-block.muted { border-left-color:#cbd5e1; }
.plan-block .tag { margin-left: 8px; font-size: 11px; }