/* 绘卷 · AI 画室 —— 纸感画室设计：暖米白纸面、墨黑正文、朱砂点缀、衬线标题 */
:root {
  --paper: #f6f2ea;
  --panel: #fffdf7;
  --ink: #211c14;
  --ink-soft: #5f564a;
  --ink-faint: #99907f;
  --line: #e3dac9;
  --line-strong: #cfc4ae;
  --accent: #bf4722;
  --accent-deep: #9c3a19;
  --accent-wash: #f6e3d8;
  --ok: #3d7a4e;
  --err: #a83324;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(33, 28, 20, 0.05), 0 10px 32px -18px rgba(33, 28, 20, 0.25);
  --serif: 'Songti SC', 'STSong', 'Noto Serif SC', 'SimSun', serif;
  --sans: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', -apple-system, sans-serif;
}

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

html, body { height: 100%; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ---------------- 顶栏 ---------------- */
.topbar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  padding: 26px clamp(20px, 4vw, 48px) 18px;
  border-bottom: 1px solid var(--line-strong);
}
.brand-name {
  font-family: var(--serif);
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.1;
}
.brand-sub {
  color: var(--ink-faint);
  font-size: 13px;
  letter-spacing: 0.28em;
  margin-top: 4px;
}
.model-badge {
  font-size: 12px;
  color: var(--ink-soft);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 5px 14px;
  letter-spacing: 0.06em;
  background: var(--panel);
  white-space: nowrap;
}

/* ---------------- 布局 ---------------- */
.layout {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(360px, 430px) 1fr;
  gap: clamp(18px, 2.6vw, 36px);
  padding: clamp(18px, 2.6vw, 36px);
  align-items: start;
  width: 100%;
  max-width: 1560px;
  margin: 0 auto;
}
@media (max-width: 980px) {
  .layout { grid-template-columns: 1fr; }
}

/* ---------------- 控制台 ---------------- */
.controls {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.mode-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid var(--line-strong);
}
.mode-tab {
  appearance: none;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--serif);
  font-size: 17px;
  letter-spacing: 0.2em;
  color: var(--ink-faint);
  padding: 10px 0 12px;
  position: relative;
  transition: color 0.18s cubic-bezier(0.25, 1, 0.5, 1);
}
.mode-tab::after {
  content: '';
  position: absolute;
  left: 22%;
  right: 22%;
  bottom: -1px;
  height: 2px;
  background: transparent;
  transition: background 0.18s cubic-bezier(0.25, 1, 0.5, 1);
}
.mode-tab.is-active { color: var(--ink); }
.mode-tab.is-active::after { background: var(--accent); }

.field { display: flex; flex-direction: column; gap: 10px; }
.field-head { display: flex; justify-content: space-between; align-items: baseline; }
.field-label {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
}
.field-note {
  font-style: normal;
  color: var(--ink-faint);
  letter-spacing: 0.02em;
  margin-left: 6px;
}
.char-count { font-size: 12px; color: var(--ink-faint); }

.prompt-input {
  width: 100%;
  resize: vertical;
  min-height: 128px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--paper);
  padding: 12px 14px;
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}
.prompt-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-wash);
}
.prompt-input::placeholder { color: var(--ink-faint); }

.inspiration { display: flex; flex-wrap: wrap; gap: 6px 10px; align-items: baseline; }
.inspiration-label { font-size: 12px; color: var(--ink-faint); }
.inspiration-chip {
  appearance: none;
  border: 1px solid var(--line);
  background: none;
  color: var(--ink-soft);
  font-size: 12px;
  border-radius: 999px;
  padding: 3px 12px;
  cursor: pointer;
  transition: all 0.16s cubic-bezier(0.25, 1, 0.5, 1);
}
.inspiration-chip:hover { border-color: var(--accent); color: var(--accent-deep); background: var(--accent-wash); }

/* 上传 */
.upload-zone {
  border: 1.5px dashed var(--line-strong);
  border-radius: var(--radius);
  background: var(--paper);
  padding: 26px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.18s ease, background 0.18s ease;
}
.upload-zone:hover, .upload-zone:focus-visible, .upload-zone.is-drag {
  border-color: var(--accent);
  background: var(--accent-wash);
  outline: none;
}
.upload-hint { color: var(--ink-faint); font-size: 13px; }

.ref-list { display: flex; gap: 10px; flex-wrap: wrap; }
.ref-item { position: relative; width: 76px; height: 76px; }
.ref-item img {
  width: 100%; height: 100%;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--line-strong);
}
.ref-remove {
  position: absolute;
  top: -7px; right: -7px;
  width: 20px; height: 20px;
  border-radius: 50%;
  border: none;
  background: var(--ink);
  color: var(--panel);
  font-size: 12px;
  line-height: 1;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
}
.ref-remove:hover { background: var(--err); }

/* 画幅 chips */
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  appearance: none;
  border: 1px solid var(--line-strong);
  background: var(--paper);
  color: var(--ink-soft);
  border-radius: 999px;
  font-size: 13px;
  padding: 6px 14px;
  cursor: pointer;
  transition: all 0.16s cubic-bezier(0.25, 1, 0.5, 1);
}
.chip:hover { border-color: var(--ink); color: var(--ink); }
.chip.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

/* 高级选项 */
.advanced { border-top: 1px solid var(--line); padding-top: 12px; }
.advanced-summary {
  cursor: pointer;
  font-size: 13px;
  color: var(--ink-soft);
  letter-spacing: 0.1em;
  list-style: none;
}
.advanced-summary::before { content: '› '; color: var(--ink-faint); }
.advanced-summary:hover { color: var(--ink); }
.advanced-body { display: flex; flex-direction: column; gap: 12px; padding-top: 12px; }
.check-line { display: flex; gap: 8px; align-items: center; font-size: 13px; color: var(--ink-soft); cursor: pointer; }
.check-line input { accent-color: var(--accent); }
.seed-line { display: flex; align-items: center; gap: 12px; }
.seed-input {
  width: 140px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--paper);
  padding: 6px 10px;
  font-size: 13px;
  color: var(--ink);
}
.seed-input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-wash); }

/* 生成按钮 */
.generate-btn {
  appearance: none;
  border: none;
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--serif);
  font-size: 17px;
  letter-spacing: 0.34em;
  text-indent: 0.34em;
  padding: 15px 0;
  cursor: pointer;
  transition: background 0.18s cubic-bezier(0.25, 1, 0.5, 1), transform 0.12s ease;
}
.generate-btn:hover:not(:disabled) { background: var(--accent-deep); }
.generate-btn:active:not(:disabled) { transform: translateY(1px); }
.generate-btn:disabled { background: var(--line-strong); color: var(--ink-faint); cursor: not-allowed; }

.controls-hint { font-size: 12px; color: var(--ink-faint); text-align: center; }

/* ---------------- 画布区 ---------------- */
.stage { display: flex; flex-direction: column; gap: 16px; min-width: 0; }

.viewer {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  min-height: clamp(380px, 52vh, 640px);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 18px;
}

/* 纸纹背景（细节：极淡的网点，模拟画纸） */
.viewer::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(33, 28, 20, 0.055) 1px, transparent 1px);
  background-size: 18px 18px;
  pointer-events: none;
}

.viewer > * { position: relative; }

.viewer-empty { text-align: center; padding: 30px; }
.empty-title { font-family: var(--serif); font-size: 22px; letter-spacing: 0.14em; color: var(--ink-soft); }
.empty-sub { margin-top: 10px; color: var(--ink-faint); font-size: 13px; }

.viewer-loading { text-align: center; }
.loading-orbits { display: flex; gap: 10px; justify-content: center; margin-bottom: 22px; }
.loading-orbits i {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--accent);
  animation: breathe 1.15s cubic-bezier(0.25, 1, 0.5, 1) infinite;
}
.loading-orbits i:nth-child(2) { animation-delay: 0.15s; background: var(--ink); }
.loading-orbits i:nth-child(3) { animation-delay: 0.3s; background: var(--line-strong); }
@keyframes breathe {
  0%, 100% { transform: scale(0.7); opacity: 0.35; }
  50% { transform: scale(1.15); opacity: 1; }
}
.loading-text { font-family: var(--serif); font-size: 18px; letter-spacing: 0.12em; }
.loading-sub { margin-top: 8px; color: var(--ink-faint); font-size: 12px; }

.viewer-result { max-width: 100%; animation: settle 0.5s cubic-bezier(0.25, 1, 0.5, 1); }
@keyframes settle {
  from { opacity: 0; transform: translateY(8px) scale(0.985); }
  to { opacity: 1; transform: none; }
}
.viewer-result img {
  max-width: 100%;
  max-height: min(68vh, 720px);
  border-radius: 6px;
  border: 1px solid var(--line-strong);
  box-shadow: 0 18px 44px -22px rgba(33, 28, 20, 0.45);
  display: block;
}

.viewer-error { text-align: center; padding: 30px; }
.error-title { font-family: var(--serif); font-size: 20px; letter-spacing: 0.12em; color: var(--err); }
.error-msg { margin-top: 10px; color: var(--ink-soft); font-size: 13px; max-width: 420px; }

/* 结果操作条 */
.result-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
}
.result-meta { font-size: 12px; color: var(--ink-faint); letter-spacing: 0.04em; }
.result-actions { display: flex; gap: 10px; }
.act-btn {
  appearance: none;
  border: 1px solid var(--line-strong);
  background: var(--panel);
  color: var(--ink-soft);
  border-radius: 999px;
  font-size: 13px;
  padding: 7px 18px;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.16s cubic-bezier(0.25, 1, 0.5, 1);
}
.act-btn:hover { border-color: var(--accent); color: var(--accent-deep); background: var(--accent-wash); }

/* 历史 */
.history { display: flex; flex-direction: column; gap: 10px; }
.history-head { display: flex; justify-content: space-between; align-items: baseline; }
.history-title { font-family: var(--serif); font-size: 15px; letter-spacing: 0.22em; color: var(--ink-soft); }
.history-clear {
  appearance: none; border: none; background: none;
  color: var(--ink-faint); font-size: 12px; cursor: pointer;
}
.history-clear:hover { color: var(--err); }
.history-strip {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 8px;
  min-height: 84px;
}
.history-empty { color: var(--ink-faint); font-size: 12px; padding: 10px 2px; }
.history-item {
  flex: 0 0 auto;
  width: 78px; height: 78px;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  cursor: pointer;
  padding: 0;
  background: none;
  transition: border-color 0.16s ease, transform 0.16s cubic-bezier(0.25, 1, 0.5, 1);
}
.history-item img { width: 100%; height: 100%; object-fit: cover; display: block; }
.history-item:hover { border-color: var(--accent); transform: translateY(-2px); }

.footnote {
  text-align: center;
  color: var(--ink-faint);
  font-size: 12px;
  padding: 14px 0 20px;
  letter-spacing: 0.08em;
}