:root {
  font-family: Inter, "Microsoft YaHei", system-ui, sans-serif;
  font-size: 16px;
  color: #f4f7ff;
  background: #101625;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  background: radial-gradient(circle at 18% 0%, #223c61 0, transparent 38rem), #101625;
}

.app-shell { width: min(920px, calc(100% - 32px)); margin: 0 auto; padding: 72px 0; }
.eyebrow { margin: 0 0 8px; color: #65d7ff; font-size: .78rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; }
h1, h2 { margin: 0; letter-spacing: -.03em; }
h1 { font-size: clamp(2.1rem, 6vw, 3.7rem); }
h2 { font-size: 1.35rem; }
.lead { max-width: 650px; margin: 18px 0 20px; color: #b7c2d8; line-height: 1.7; }
.font-size-control { display: flex; align-items: center; width: fit-content; gap: 12px; margin-bottom: 32px; color: #b7c2d8; font-size: .8rem; }
.font-size-control input { width: 180px; accent-color: #38bdf8; }
.font-size-control output { min-width: 3.5em; color: #65d7ff; font-variant-numeric: tabular-nums; }
.panel { border: 1px solid #2c3951; border-radius: 16px; background: rgba(22, 30, 48, .9); box-shadow: 0 16px 48px rgba(0, 0, 0, .17); }
.uploader { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; padding: 28px; }
.file-field { min-width: 0; }
label { display: block; margin-bottom: 10px; font-weight: 700; }
label span { margin-left: 6px; color: #8ea0bd; font-size: .75rem; font-weight: 500; }
input[type="file"] { width: 100%; color: #b7c2d8; }
.input-actions { display: flex; align-items: center; gap: 8px; }
.input-actions input[type="file"] { min-width: 0; flex: 1; }
.paste-button { align-self: auto; grid-column: auto; flex: none; padding: 10px 12px; background: #293b57; color: #eef6ff; white-space: nowrap; }
input[type="number"] { width: 100%; border: 1px solid #455674; border-radius: 8px; padding: 10px 12px; color: #f4f7ff; background: #101a2c; font: inherit; }
input[type="number"]:focus { border-color: #65d7ff; outline: 2px solid rgba(101, 215, 255, .2); }
input::file-selector-button,
button,
.secondary {
  min-height: 42px;
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 10px 14px;
  color: #f8fbff;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: transform .15s ease, background .15s ease, border-color .15s ease;
}
input::file-selector-button { margin-right: 10px; background: #2b3b57; }
.file-name { overflow: hidden; margin: 10px 0 0; color: #8ea0bd; font-size: .83rem; text-overflow: ellipsis; white-space: nowrap; }
button { align-self: end; grid-column: 1 / -1; background: #38bdf8; color: #07111e; }
button:hover { background: #72d5ff; transform: translateY(-1px); }
.secondary { align-self: auto; grid-column: auto; background: #1a2941; border-color: #3a5275; color: #dcecff; }
.secondary:hover { background: #293e5e; border-color: #65d7ff; transform: translateY(-1px); }
.vrc-map-row { display: flex; align-items: center; flex-wrap: nowrap; grid-column: 1 / -1; gap: 12px; }
.vrc-map-link { display: inline-flex; align-items: center; justify-content: center; flex: 0 0 auto; width: 150px; text-decoration: none; }
.vrc-map-hint { flex: 1; margin: 0; color: #9dacc3; font-size: .83rem; line-height: 1.45; }
.message { min-height: 24px; margin: 20px 2px; color: #9eb0cb; }
.message.error { color: #ff9b9b; }
.result { padding: 28px; }
.result-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin: 24px 0; }
.metrics div { padding: 12px; border-radius: 10px; background: #19243a; }
.metrics strong { display: block; color: #65d7ff; font-size: 1.1rem; }
.metrics span { display: block; margin-top: 4px; color: #9dacc3; font-size: .78rem; }
pre { overflow: auto; max-height: 470px; margin: 0; padding: 18px; border-radius: 10px; background: #0d1422; color: #c7f0ff; font-size: .8rem; line-height: 1.55; }
.site-footer { margin-top: 28px; color: #71829e; font-size: .75rem; text-align: center; }
.hidden { display: none; }

@media (max-width: 650px) {
  .app-shell { padding: 38px 0; }
  .uploader { grid-template-columns: 1fr; }
  .metrics { grid-template-columns: repeat(2, 1fr); }
  .vrc-map-row { align-items: flex-start; flex-direction: column; gap: 8px; }
}