:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --ink: #16243a;
  --muted: #5a6b85;
  --line: #dbe3f0;
  --brand: #2a6fb0;
  --brand-dk: #1d5187;
  --ok: #1f7a4d;
  --warn: #b4451f;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.5;
}
.zh { color: var(--muted); font-size: 0.92em; }
code {
  background: #eef2f9; padding: 0.05em 0.35em; border-radius: 4px;
  font-size: 0.9em;
}

.hd {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 0.9rem 1.4rem;
  background: var(--card); border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 5;
}
.brand { display: flex; align-items: center; gap: 0.7rem; }
.brand-mark { font-size: 1.8rem; }
.brand-text h1 { margin: 0; font-size: 1.15rem; }
.brand-text p { margin: 0.1rem 0 0; }
.hd-right { display: flex; align-items: center; gap: 0.5rem; }
.badge {
  font-size: 0.8rem; color: var(--muted); background: #eef2f9;
  border: 1px solid var(--line); border-radius: 999px; padding: 0.25rem 0.7rem;
}
.badge-link { text-decoration: none; color: var(--brand-dk); }
.badge-link:hover { background: #e3ecf8; }
.badge-link .zh { color: var(--brand); }

.main { max-width: 1180px; margin: 0 auto; padding: 1.4rem; }
.intro { font-size: 1.02rem; }
.intro .zh, .note .zh { display: block; margin-top: 0.25rem; }
.note { color: var(--muted); font-size: 0.92rem; margin-top: -0.3rem; }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 1.2rem 1.3rem; margin: 1.1rem 0;
  box-shadow: 0 1px 2px rgba(20, 36, 58, 0.04);
}
.card h2 { margin: 0 0 0.8rem; font-size: 1.05rem; }
.card h2 .zh { font-weight: 400; }

.drop {
  border: 2px dashed var(--line); border-radius: 12px;
  padding: 1.4rem; text-align: center; transition: border-color 0.15s, background 0.15s;
  background: #fafcff;
}
.drop.over { border-color: var(--brand); background: #eef5fd; }
.drop-hint { margin: 0; color: var(--muted); }
.drop-file { margin: 0.6rem 0 0; font-size: 0.88rem; color: var(--ink); }
#preview {
  display: block; max-width: 100%; max-height: 260px; margin: 0.9rem auto 0;
  border-radius: 8px; border: 1px solid var(--line);
}
#preview[hidden] { display: none; }
.link {
  background: none; border: none; color: var(--brand); cursor: pointer;
  font: inherit; padding: 0; text-decoration: underline;
}

.hint-label { display: block; margin: 1rem 0 0.3rem; font-size: 0.9rem; }
textarea {
  width: 100%; border: 1px solid var(--line); border-radius: 8px;
  padding: 0.6rem 0.7rem; font: inherit; resize: vertical;
}

.actions { display: flex; align-items: center; gap: 0.9rem; margin-top: 1rem; flex-wrap: wrap; }
.btn {
  border: 1px solid var(--line); background: #fff; color: var(--ink);
  border-radius: 9px; padding: 0.55rem 1rem; font: inherit; cursor: pointer;
  transition: background 0.15s, border-color 0.15s, opacity 0.15s;
}
.btn:hover:not(:disabled) { background: #f1f5fb; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn.primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn.primary:hover:not(:disabled) { background: var(--brand-dk); }
.btn .zh { color: inherit; opacity: 0.85; font-size: 0.85em; }

.status { font-size: 0.9rem; color: var(--muted); }
.status.err { color: var(--warn); }
.status.ok { color: var(--ok); }
.status.busy::after { content: " …"; }

.editor-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; flex-wrap: wrap;
}
.editor-actions { display: flex; align-items: center; gap: 0.6rem; flex-wrap: wrap; }
.frame-wrap {
  margin-top: 0.8rem; border: 1px solid var(--line); border-radius: 10px;
  overflow: hidden; height: 72vh; min-height: 460px; background: #fff;
}
#dio { width: 100%; height: 100%; border: 0; display: block; }

.ft { color: var(--muted); font-size: 0.85rem; margin: 1.6rem 0 2rem; }
.ft a { color: var(--brand); }

@media (max-width: 640px) {
  .brand-text h1 { font-size: 1rem; }
  .frame-wrap { height: 64vh; }
}