:root {
  --paper: #f7f4ec;
  --paper-2: #fffdf8;
  --ink: #2b2722;
  --ink-soft: #6a6258;
  --line: #e4ddcf;
  --wheat: #c8a24a;
  --wheat-deep: #a9842f;
  --night: #2f3a4a;
  --radius: 14px;
  --shadow: 0 10px 40px rgba(60, 50, 30, 0.08);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Serif SC", "Songti SC", "STSong", "SimSun", "LXGW WenKai", serif;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

.page {
  max-width: 1080px;
  margin: 0 auto;
  padding: 48px 24px 64px;
}

/* 头部 */
.masthead {
  text-align: center;
  margin-bottom: 36px;
}
.brand {
  font-size: 38px;
  letter-spacing: 0.32em;
  margin: 0 0 10px;
  font-weight: 600;
  text-indent: 0.32em;
}
.subtitle {
  margin: 0;
  color: var(--ink-soft);
  letter-spacing: 0.12em;
  font-size: 15px;
}

/* API Key 栏 */
.keybar { margin-top: 16px; }
.key-mode {
  display: inline-flex;
  gap: 6px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px;
}
.key-opt {
  font-family: inherit;
  font-size: 12px;
  letter-spacing: 0.04em;
  padding: 6px 14px;
  border: none;
  background: transparent;
  color: var(--ink-soft);
  border-radius: 999px;
  cursor: pointer;
  transition: all .18s;
}
.key-opt:hover { color: var(--ink); }
.key-opt.active {
  background: var(--night);
  color: #fff;
}
.key-panel {
  max-width: 560px;
  margin: 12px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  align-items: center;
}
.key-panel input {
  flex: 1 1 280px;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 8px;
  padding: 9px 12px;
  font-family: inherit;
  font-size: 13px;
}
.key-panel input:focus {
  outline: none;
  border-color: var(--wheat);
  box-shadow: 0 0 0 3px rgba(200, 162, 74, 0.15);
}
.key-tip {
  flex-basis: 100%;
  text-align: center;
  margin: 4px 0 0;
  font-size: 12px;
  color: var(--ink-soft);
}

/* 布局 */
.layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: start;
}
@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
}

.panel {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 26px 30px;
  box-shadow: var(--shadow);
}

/* 输入区 */
.field { margin-bottom: 20px; }
.field:last-of-type { margin-bottom: 22px; }

label, .legend {
  display: block;
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--ink);
  margin-bottom: 8px;
  font-weight: 600;
}
.opt {
  margin-left: 8px;
  font-weight: 400;
  font-size: 12px;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
}

input[type="text"], textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 10px;
  padding: 11px 14px;
  font-family: inherit;
  font-size: 15px;
  color: var(--ink);
  resize: vertical;
  transition: border-color .2s, box-shadow .2s;
}
input[type="text"]:focus, textarea:focus {
  outline: none;
  border-color: var(--wheat);
  box-shadow: 0 0 0 3px rgba(200, 162, 74, 0.15);
}

/* 主题词 chips */
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}
.chip {
  font-size: 13px;
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--ink-soft);
  cursor: pointer;
  letter-spacing: 0.04em;
  transition: all .18s;
}
.chip:hover { border-color: var(--wheat); color: var(--ink); }
.chip.on {
  background: var(--wheat);
  border-color: var(--wheat);
  color: #fff;
}

/* 分段按钮 */
.segmented {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 8px;
}
.seg {
  font-family: inherit;
  font-size: 14px;
  padding: 8px 18px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink-soft);
  border-radius: 10px;
  cursor: pointer;
  letter-spacing: 0.06em;
  transition: all .18s;
}
.seg:hover { border-color: var(--wheat); color: var(--ink); }
.seg.active {
  background: var(--night);
  border-color: var(--night);
  color: #fff;
}

/* 生成按钮 */
.generate {
  width: 100%;
  font-family: inherit;
  font-size: 16px;
  letter-spacing: 0.3em;
  text-indent: 0.3em;
  padding: 14px;
  border: none;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--wheat), var(--wheat-deep));
  color: #fff;
  cursor: pointer;
  transition: transform .12s, box-shadow .2s, opacity .2s;
  box-shadow: 0 8px 20px rgba(169, 132, 47, 0.25);
}
.generate:hover { transform: translateY(-1px); }
.generate:active { transform: translateY(0); }
.generate:disabled { opacity: .55; cursor: not-allowed; transform: none; }

.hint {
  min-height: 18px;
  margin: 10px 2px 0;
  font-size: 13px;
  color: var(--wheat-deep);
  letter-spacing: 0.04em;
}

/* 结果区 */
.result { min-height: 320px; }
.empty {
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  color: var(--ink-soft);
  padding: 40px 0;
}
.muted { color: #a59c8d; font-size: 13px; }

.poem.hidden, .refs.hidden, .empty.hidden, .loading.hidden { display: none; }

.poem-text {
  font-family: inherit;
  font-size: 19px;
  line-height: 2.1;
  white-space: pre-wrap;
  word-break: break-word;
  margin: 0 0 18px;
  color: var(--ink);
  letter-spacing: 0.03em;
}

.poem-actions { display: flex; gap: 10px; }
.ghost {
  font-family: inherit;
  font-size: 13px;
  padding: 7px 16px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink-soft);
  border-radius: 8px;
  cursor: pointer;
  letter-spacing: 0.06em;
  transition: all .18s;
}
.ghost:hover { border-color: var(--wheat); color: var(--ink); }

/* 参考诗 */
.refs {
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px dashed var(--line);
}
.refs-title {
  font-size: 14px;
  letter-spacing: 0.16em;
  color: var(--ink-soft);
  margin: 0 0 14px;
  font-weight: 600;
}
.ref-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  margin-bottom: 12px;
  overflow: hidden;
  background: #fffefb;
}
.ref-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding: 11px 14px;
  cursor: pointer;
  user-select: none;
}
.ref-head:hover { background: #faf6ec; }
.ref-name { font-size: 15px; }
.ref-name .author { color: var(--wheat-deep); margin-right: 6px; font-size: 13px; }
.ref-themes { font-size: 12px; color: var(--ink-soft); letter-spacing: 0.04em; }
.ref-toggle { color: var(--ink-soft); font-size: 12px; flex-shrink: 0; }
.ref-body {
  padding: 0 14px;
  max-height: 0;
  overflow: hidden;
  transition: max-height .25s ease, padding .25s ease;
}
.ref-item.open .ref-body { padding: 4px 14px 14px; max-height: 1200px; }
.ref-style {
  font-size: 13px;
  color: var(--ink-soft);
  margin: 0 0 8px;
  font-style: italic;
}
.ref-content {
  font-family: inherit;
  font-size: 14px;
  line-height: 1.95;
  white-space: pre-wrap;
  color: var(--ink);
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--line);
}

/* 页脚 */
.foot {
  margin-top: 40px;
  text-align: center;
  font-size: 12px;
  color: #a59c8d;
  letter-spacing: 0.1em;
}

/* loading */
.loading {
  position: fixed;
  inset: 0;
  background: rgba(247, 244, 236, 0.78);
  backdrop-filter: blur(2px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
}
.loading-inner { text-align: center; color: var(--ink-soft); letter-spacing: 0.16em; }
.dots { display: flex; gap: 8px; justify-content: center; margin-bottom: 14px; }
.dots span {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--wheat);
  animation: bounce 1.2s infinite ease-in-out;
}
.dots span:nth-child(2) { animation-delay: .2s; }
.dots span:nth-child(3) { animation-delay: .4s; }
@keyframes bounce {
  0%, 80%, 100% { transform: scale(0.6); opacity: .5; }
  40% { transform: scale(1); opacity: 1; }
}