:root {
  --ink: #12151a;
  --muted: #61708a;
  --line: #e3e8ef;
  --bg: #f7f9fc;
  --card: #ffffff;
  --accent: #2f5bff;
  --err: #c0362c;
  --radius: 14px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
}

.wrap { width: min(1120px, 92vw); margin: 0 auto; }

.top {
  background: var(--card);
  border-bottom: 1px solid var(--line);
  padding: 28px 0 22px;
  margin-bottom: 28px;
}
.top h1 { margin: 0; font-size: 26px; letter-spacing: -0.02em; }
.sub { margin: 4px 0 0; color: var(--muted); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  margin-bottom: 24px;
}
h2 { margin: 0 0 18px; font-size: 20px; letter-spacing: -0.01em; }
.muted { color: var(--muted); }

.field { display: block; margin-bottom: 18px; }
.field > span { display: block; font-weight: 600; font-size: 14px; margin-bottom: 6px; }
.field b { color: var(--accent); }
.field i { color: var(--muted); font-weight: 400; font-style: normal; font-size: 12px; }
.field small { display: block; color: var(--muted); font-size: 12px; margin-top: 5px; }

input[type="text"], input:not([type]), textarea, input[type="file"] {
  width: 100%;
  padding: 11px 13px;
  font: inherit;
  font-size: 15px;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
}
input[type="file"] { padding: 9px; background: var(--bg); }
textarea { resize: vertical; }
input:focus-visible, textarea:focus-visible, button:focus-visible, a:focus-visible {
  outline: 3px solid rgba(47, 91, 255, .35);
  outline-offset: 2px;
}

.btn {
  display: inline-block;
  padding: 11px 18px;
  font: inherit;
  font-weight: 600;
  font-size: 15px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  text-decoration: none;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.ghost { background: transparent; }
.btn:disabled { opacity: .55; cursor: default; }

.err { color: var(--err); font-weight: 500; margin: 12px 0 0; }

.bar { height: 6px; background: var(--line); border-radius: 99px; overflow: hidden; }
.bar-fill {
  height: 100%;
  width: 35%;
  background: var(--accent);
  border-radius: 99px;
  animation: slide 1.6s ease-in-out infinite;
}
@keyframes slide {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(320%); }
}

.palette { display: flex; align-items: center; gap: 8px; margin-top: 16px; flex-wrap: wrap; }
.sw { width: 26px; height: 26px; border-radius: 7px; border: 1px solid rgba(0,0,0,.12); display: inline-block; }

.options { display: grid; gap: 22px; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.option {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.option-head { padding: 18px 18px 12px; }
.option-head h3 { margin: 0 0 4px; font-size: 17px; }
.option-head p { margin: 0; font-size: 13px; }
.frame-wrap { height: 420px; border-block: 1px solid var(--line); background: #fff; overflow: hidden; }
.frame-wrap iframe { width: 1280px; height: 1400px; border: 0; transform: scale(.32); transform-origin: 0 0; }
.option-foot { padding: 14px 18px; display: flex; gap: 10px; justify-content: space-between; align-items: center; }

#site-frame { width: 100%; height: 70vh; border: 1px solid var(--line); border-radius: 10px; margin-top: 18px; background: #fff; }

.foot { padding: 30px 0 40px; color: var(--muted); }

@media (max-width: 640px) {
  .frame-wrap { height: 300px; }
  .frame-wrap iframe { transform: scale(.23); }
  .option-foot { flex-direction: column; align-items: stretch; }
}