:root {
  --bg: #e7f3f2;
  --bg-deep: #d5ebe9;
  --text: #1d3d3c;
  --text-muted: rgba(29, 61, 60, 0.68);
  --accent: #b8892d;
  --line: rgba(29, 61, 60, 0.12);
  --panel: #ffffff;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  font-family: "Source Han Serif SC", "Noto Serif SC", "Songti SC", serif;
  color: var(--text);
  background:
    radial-gradient(ellipse at 20% 0%, rgba(184, 137, 45, 0.1), transparent 40%),
    linear-gradient(180deg, #f7fcfb 0%, var(--bg) 50%, var(--bg-deep) 100%);
}

.bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem clamp(1.25rem, 4vw, 3rem);
  border-bottom: 1px solid var(--line);
  background: rgba(247, 252, 251, 0.88);
  backdrop-filter: blur(10px);
}

.back {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  border: none;
  background: transparent;
  padding: 0;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: clamp(1rem, 2vw, 1.2rem);
  letter-spacing: 0.16em;
  color: var(--accent);
  opacity: 0.9;
  transition: opacity 0.25s ease;
}

.back:hover {
  opacity: 1;
}

.title {
  font-size: clamp(1.45rem, 3vw, 1.9rem);
  letter-spacing: 0.12em;
  font-weight: 600;
}