/* ====== 全局 ====== */
* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --primary: #4f7cff;
  --primary-dark: #3a5fd9;
  --bg: #eef2fb;
  --card: #ffffff;
  --border: #e6e8ef;
  --text: #1f2937;
  --text-muted: #6b7280;
  --radius: 16px;
  --shadow: 0 8px 30px rgba(31,41,55,.08);
}
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  background: linear-gradient(135deg, #eef2fb 0%, #e6ecf8 100%);
}

.app {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 16px 40px;
}

/* ====== 顶部标题 ====== */
.app-header { text-align: center; margin-bottom: 24px; }
.app-header .tag {
  display: inline-block;
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 8px;
}
.app-header h1 {
  font-size: 30px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: 1px;
}
.app-header h1 .highlight { color: var(--primary); }
.app-header .sub { color: var(--text-muted); font-size: 14px; margin-top: 6px; }

/* ====== 主体布局 ====== */
.workspace {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 20px;
  align-items: start;
}
@media (max-width: 900px) {
  .workspace { grid-template-columns: 1fr; }
}

/* ====== 控制面板 ====== */
.panel {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.panel-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  background: #fafbff;
}
.panel-tab {
  flex: 1;
  padding: 14px 8px;
  text-align: center;
  cursor: pointer;
  font-size: 14px;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
  transition: all .2s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
}
.panel-tab .icon { font-size: 18px; }
.panel-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  background: #fff;
  font-weight: 600;
}
.panel-body { padding: 20px; }
.tab-pane { display: none; }
.tab-pane.active { display: block; animation: fadeIn .25s; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

/* 情侣签名开关 */
.couple-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}
.couple-row label { font-size: 14px; }
.switch {
  position: relative;
  width: 44px;
  height: 24px;
  background: #d1d5db;
  border-radius: 12px;
  cursor: pointer;
  transition: background .2s;
}
.switch.on { background: var(--primary); }
.switch::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  background: #fff;
  border-radius: 50%;
  transition: transform .2s;
}
.switch.on::after { transform: translateX(20px); }

/* 双人切换标签 */
.person-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}
.person-tab {
  flex: 1;
  padding: 8px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  text-align: center;
  font-size: 13px;
  cursor: pointer;
  background: #fff;
  transition: all .15s;
}
.person-tab.active {
  border-color: var(--primary);
  color: var(--primary);
  background: #eef3ff;
  font-weight: 600;
}
.person-tab .dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 4px;
  vertical-align: middle;
}

/* 表单控件 */
.field { margin-bottom: 16px; }
.field > label {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 6px;
}
.field input[type="text"], .field input[type="number"] {
  width: 100%;
  padding: 10px 12px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  outline: none;
  transition: border-color .15s;
}
.field input:focus { border-color: var(--primary); }

.color-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.color-row input[type="color"] {
  width: 40px;
  height: 40px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  padding: 2px;
  background: #fff;
}
.color-row input[type="text"] {
  flex: 1;
  padding: 10px 12px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-family: ui-monospace, monospace;
  font-size: 13px;
  text-transform: uppercase;
}

/* 滑块 */
.slider-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.slider-row input[type="range"] {
  flex: 1;
  accent-color: var(--primary);
}
.slider-row .val {
  min-width: 48px;
  text-align: right;
  font-size: 13px;
  color: var(--text-muted);
  font-family: ui-monospace, monospace;
}

/* 装饰图案网格 */
.deco-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}
.deco-item {
  aspect-ratio: 1;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  background: #fff;
  transition: all .15s;
  font-size: 12px;
  color: var(--text-muted);
}
.deco-item .di { font-size: 22px; margin-bottom: 2px; }
.deco-item:hover { border-color: var(--primary); color: var(--primary); }
.deco-item.active {
  border-color: var(--primary);
  background: #eef3ff;
  color: var(--primary);
  font-weight: 600;
}

/* 比例选择 */
.ratio-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}
.ratio-item {
  padding: 14px 8px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  text-align: center;
  cursor: pointer;
  transition: all .15s;
}
.ratio-item .ri-icon {
  width: 32px;
  height: 22px;
  border: 2px solid var(--text-muted);
  border-radius: 3px;
  margin: 0 auto 6px;
}
.ratio-item.portrait .ri-icon { width: 18px; height: 30px; }
.ratio-item.square .ri-icon { width: 26px; height: 26px; }
.ratio-item .ri-label { font-size: 13px; font-weight: 600; }
.ratio-item .ri-sub { font-size: 11px; color: var(--text-muted); }
.ratio-item.active {
  border-color: var(--primary);
  background: #eef3ff;
  color: var(--primary);
}
.ratio-item.active .ri-icon { border-color: var(--primary); }

/* 音乐上传 */
.music-upload {
  border: 1.5px dashed var(--border);
  border-radius: 10px;
  padding: 14px;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s;
  font-size: 13px;
  color: var(--text-muted);
}
.music-upload:hover { border-color: var(--primary); color: var(--primary); }
.music-upload .mu-name {
  color: var(--primary);
  font-weight: 600;
  margin-top: 4px;
  word-break: break-all;
}

.btn {
  display: block;
  width: 100%;
  padding: 14px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background .2s;
  margin-top: 16px;
}
.btn:hover:not(:disabled) { background: var(--primary-dark); }
.btn:disabled { background: #a9b8e0; cursor: not-allowed; }
.btn.secondary { background: #f3f4f6; color: var(--text); }
.btn.secondary:hover { background: #e5e7eb; }

/* ====== 预览区 ====== */
.preview-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.canvas-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  position: relative;
}
.canvas-wrap {
  position: relative;
  width: 100%;
  background: #000;
  border-radius: 10px;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
}
.canvas-wrap canvas {
  max-width: 100%;
  max-height: 100%;
  display: block;
}
.canvas-hint {
  position: absolute;
  top: 12px;
  right: 14px;
  color: rgba(255,255,255,.5);
  font-size: 12px;
}

/* ====== 时间轴 ====== */
.timeline {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.tl-play {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  border: none;
  cursor: pointer;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background .2s;
}
.tl-play:hover { background: var(--primary-dark); }
.tl-time {
  font-family: ui-monospace, monospace;
  font-size: 13px;
  color: var(--text-muted);
  min-width: 70px;
  text-align: center;
}
.tl-slider {
  flex: 1;
  accent-color: var(--primary);
}
.tl-actions { display: flex; gap: 8px; flex-shrink: 0; }
.tl-btn {
  padding: 8px 14px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
  font-size: 13px;
  transition: all .15s;
}
.tl-btn:hover { border-color: var(--primary); color: var(--primary); }
.tl-btn.primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.tl-btn.primary:hover { background: var(--primary-dark); }

/* 导出进度 */
.export-status {
  margin-top: 12px;
  padding: 10px;
  background: #f0f5ff;
  border-radius: 8px;
  font-size: 13px;
  color: var(--primary);
  text-align: center;
  display: none;
}
.export-status.show { display: block; }

/* ====== 字体选择 ====== */
.font-select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  font-size: 14px;
  color: var(--text);
  cursor: pointer;
  outline: none;
  transition: border-color .15s;
}
.font-select:focus { border-color: var(--primary); }

.font-online-row {
  display: flex;
  gap: 8px;
  align-items: center;
}
.font-online-row .font-select { flex: 1; }
.font-online-row .btn { padding: 10px 14px; }

.action-row {
  display: flex;
  gap: 8px;
}
.action-row .btn {
  flex: 1;
  padding: 10px 8px;
  font-size: 13px;
}

/* ====== 预设列表 ====== */
.preset-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.preset-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: all .15s;
}
.preset-item:hover { background: #eef2ff; border-color: var(--primary); }
.preset-name {
  cursor: pointer;
  font-size: 13px;
  color: var(--text);
  flex: 1;
}
.preset-name:hover { color: var(--primary); }
.preset-del {
  cursor: pointer;
  color: #9ca3af;
  font-size: 14px;
  padding: 2px 6px;
  border-radius: 4px;
  transition: all .15s;
}
.preset-del:hover { background: #fee2e2; color: #dc2626; }

/* ====== Banner / 公告 ====== */
.banner-area {
  margin-top: 12px;
  border-radius: 12px;
  overflow: hidden;
}
.announcement {
  margin-top: 12px;
  padding: 10px 16px;
  background: linear-gradient(90deg, #eef2ff, #faf5ff);
  border: 1px solid #c7d2fe;
  border-radius: 10px;
  font-size: 13px;
  color: #4338ca;
  text-align: center;
  animation: fadeIn .4s ease;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 响应式 */
@media (max-width: 640px) {
  .app-header h1 { font-size: 22px; }
  .timeline { flex-wrap: wrap; }
  .tl-slider { order: 5; width: 100%; }
}