/* ===== Fonts ===== */
@font-face {
  font-family: 'LXGW WenKai';
  src: url('https://cdn.jsdelivr.net/npm/lxgw-wenkai-webfont@1.7.0/lxgwwenkai-regular.woff2') format('woff2');
  font-weight: normal;
  font-style: normal;
  font-display: swap;
}

/* ===== Tokens / Light ===== */
:root,
:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f3f5f8;
  --preview-bg: radial-gradient(circle at 50% 35%, #ffffff 0%, #e9edf3 100%);
  --bg-soft: #f8fafc;
  --panel: #ffffff;
  --panel-soft: #f8fafc;
  --border: #e2e8f0;
  --border-soft: #edf2f7;
  --text: #0f172a;
  --text-muted: #475569;
  --text-faint: #94a3b8;
  --placeholder: #94a3b8;
  --ink: #0f172a;
  --ink-soft: #1e293b;
  --focus-ring: rgba(15,23,42,0.08);
  --shadow-paper: 0 2px 4px rgba(15,23,42,0.03), 0 16px 36px -4px rgba(15,23,42,0.08);
  --paper-bg: #ffffff;
  --paper-text: #0f172a;
  --hf-text: #64748b;
  --hf-line: #cbd5e1;
  --btn-primary-bg: #0f172a;
  --btn-primary-text: #ffffff;
  --btn-primary-hover: #1e293b;
  --btn-secondary-bg: #ffffff;
  --btn-secondary-text: #334155;
  --btn-secondary-border: #cbd5e1;
  --btn-secondary-hover-bg: #f1f5f9;
  /* 分段控件：浅灰轨道 + 白底选中 + 轻阴影（参考 iOS / 系统切换） */
  --seg-track: #f1f5f9;
  --seg-track-border: #e2e8f0;
  --seg-active-bg: #ffffff;
  --seg-active-text: #0f172a;
  --seg-inactive: #64748b;
  --seg-shadow: 0 1px 3px rgba(15, 23, 42, 0.08), 0 2px 6px rgba(15, 23, 42, 0.04);
  /* 开关 (Toggle Switch) 浅色配色 */
  --switch-track: #e2e8f0;
  --switch-border: #cbd5e1;
  --switch-knob: #ffffff;
  --switch-knob-shadow: 0 1px 3px rgba(15, 23, 42, 0.18);
  --switch-active-bg: #10b981;
  --switch-active-border: #10b981;
  --switch-active-knob: #ffffff;
  --switch-active-shadow: 0 2px 6px rgba(16, 185, 129, 0.25);
}

/* ===== Dark ===== */
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0a0b0e;
  --preview-bg: radial-gradient(circle at 50% 35%, #181920 0%, #0a0b0e 100%);
  --bg-soft: #14161b;
  --panel: rgba(18, 20, 25, 0.92);
  --panel-soft: rgba(255, 255, 255, 0.05);
  --border: rgba(255, 255, 255, 0.12);
  --border-soft: rgba(255, 255, 255, 0.07);
  /* 侧栏文字与排版：冷晶白与层次灰 */
  --text: #f8fafc;
  --text-muted: #94a3b8;
  --text-faint: #64748b;
  --placeholder: #64748b;
  --ink: #f8fafc;
  --ink-soft: #cbd5e1;
  --focus-ring: rgba(16, 185, 129, 0.35);
  /* 纸张在暗色下的柔和发光衬垫与浮空阴影 */
  --shadow-paper: 0 16px 42px rgba(0, 0, 0, 0.75), 0 0 1px rgba(255, 255, 255, 0.2), 0 0 36px rgba(255, 255, 255, 0.03);
  --paper-bg: #faf8f5;
  --paper-text: #1c1b17;
  --hf-text: #555550;
  --hf-line: #d8d4cc;
  --btn-primary-bg: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  --btn-primary-text: #ffffff;
  --btn-primary-hover: #1d4ed8;
  --btn-secondary-bg: rgba(255, 255, 255, 0.08);
  --btn-secondary-text: #f1f5f9;
  --btn-secondary-border: rgba(255, 255, 255, 0.12);
  --btn-secondary-hover-bg: rgba(255, 255, 255, 0.14);
  /* 分段控件深色：极微调深暗轨道 + 高微亮选框 */
  --seg-track: rgba(255, 255, 255, 0.07);
  --seg-track-border: rgba(255, 255, 255, 0.1);
  --seg-active-bg: rgba(255, 255, 255, 0.16);
  --seg-active-text: #ffffff;
  --seg-inactive: #94a3b8;
  --seg-shadow: 0 2px 8px rgba(0, 0, 0, 0.45), inset 0 1px 0.5px rgba(255, 255, 255, 0.2);
  /* 开关 (Toggle Switch) 深色配色：翡翠绿高亮与沉浸呼吸发光 */
  --switch-track: rgba(255, 255, 255, 0.12);
  --switch-border: rgba(255, 255, 255, 0.18);
  --switch-knob: #ffffff;
  --switch-knob-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
  --switch-active-bg: #10b981;
  --switch-active-border: #10b981;
  --switch-active-knob: #ffffff;
  --switch-active-shadow: 0 0 14px rgba(16, 185, 129, 0.5);
}

:root {
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
}

/* ===== Reset ===== */
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; height: 100dvh; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background 0.2s, color 0.2s;
}

/* ===== Mobile Header & Floating Dock (Default Hidden on Desktop) ===== */
#mobile-header,
.mobile-floating-dock {
  display: none;
}
.drawer-handle,
.drawer-top-bar,
.mobile-only-btn {
  display: none !important;
}
.drawer-backdrop {
  display: none;
}

/* ===== Controls panel ===== */
#controls {
  width: 320px;
  flex-shrink: 0;
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

#controls header {
  padding: 26px 22px 14px;
  flex-shrink: 0;
}
.brand-title-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}
.brand {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}
#controls header h1 {
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.8px;
  color: var(--text);
  margin: 0;
  line-height: 1.2;
  display: flex;
  align-items: center;
}
#controls .hint {
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.15px;
  line-height: 1.5;
}

/* ===== Brand SVG Logo Icon ===== */
.brand-logo-icon {
  flex-shrink: 0;
  display: inline-block;
  vertical-align: middle;
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), filter 0.25s ease;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.08));
}
.brand-title-wrap:hover .brand-logo-icon,
.mobile-brand:hover .brand-logo-icon {
  transform: scale(1.08) rotate(-4deg);
}

/* Light Theme Icon Styling (白底田字格与经典红铅笔参考) */
.brand-icon-bg {
  fill: #ffffff;
  stroke: rgba(0, 0, 0, 0.12);
  stroke-width: 1;
}
.brand-tian-bg {
  fill: #ffffff;
}
.brand-tian-border {
  stroke: #94a3b8;
}
.brand-grid-line {
  stroke: #cbd5e1;
}
.brand-pencil-body {
  fill: #ef4444; /* 参考参考图的鲜红铅笔杆 */
}
.brand-pencil-highlight {
  fill: #f87171; /* 铅笔斜切面亮光 */
}
.brand-pencil-wood {
  fill: #fed7aa; /* 原木削笔锥面 */
}
.brand-pencil-lead {
  fill: #1f2937; /* 石墨铅芯 */
}
.brand-ink-dot {
  fill: #374151; /* 铅笔痕迹点 */
}

/* Dark Theme Icon Styling */
:root[data-theme="dark"] .brand-icon-bg {
  fill: #1e293b;
  stroke: rgba(255, 255, 255, 0.15);
}
:root[data-theme="dark"] .brand-tian-bg {
  fill: #ffffff; /* 深色模式下田字格区域保持纯白宣纸感 */
}
:root[data-theme="dark"] .brand-tian-border {
  stroke: #94a3b8;
}
:root[data-theme="dark"] .brand-grid-line {
  stroke: #cbd5e1;
}
:root[data-theme="dark"] .brand-pencil-body {
  fill: #ef4444;
}
:root[data-theme="dark"] .brand-pencil-highlight {
  fill: #f87171;
}
:root[data-theme="dark"] .brand-pencil-wood {
  fill: #fed7aa;
}
:root[data-theme="dark"] .brand-pencil-lead {
  fill: #1f2937;
}
:root[data-theme="dark"] .brand-ink-dot {
  fill: #4b5563;
}

/* 深色侧栏：强制高亮文字，避免标签/提示发灰 */
:root[data-theme="dark"] #controls {
  color: #ffffff;
}
:root[data-theme="dark"] #controls header h1,
:root[data-theme="dark"] #controls .field > span,
:root[data-theme="dark"] #controls .switch-field,
:root[data-theme="dark"] #controls .section-title,
:root[data-theme="dark"] #controls .panel h2,
:root[data-theme="dark"] #controls .micro,
:root[data-theme="dark"] #controls .hint {
  color: #f5f0e6;
}
:root[data-theme="dark"] #controls .field > span,
:root[data-theme="dark"] #controls .section-title {
  color: #ffffff;
  opacity: 0.95;
}
:root[data-theme="dark"] #controls .hint,
:root[data-theme="dark"] #controls .micro {
  color: #ebe3d4;
  opacity: 1;
}

/* 主题切换 / Tab：同一小圆角轨道 + 内部选中块 */
.theme-switch,
.tabs {
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--seg-track);
  border: 1px solid var(--seg-track-border);
  box-shadow: none;
  padding: 4px;
  border-radius: 8px;
}
.tabs {
  margin: 0 22px 14px;
  flex-shrink: 0;
}

.theme-switch > button,
.tabs > .tab {
  border: none !important;
  background: transparent !important;
  color: var(--seg-inactive) !important;
  cursor: pointer;
  box-shadow: none !important;
  font-family: inherit;
  border-radius: 6px;
  transition: background 0.18s ease, color 0.18s ease, box-shadow 0.18s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.theme-switch > button {
  flex: 1;
  height: 36px;
  padding: 0 !important;
  line-height: 0;
}
.theme-switch > button svg {
  display: block;
  width: 17px;
  height: 17px;
}
.theme-switch > button:hover:not(.active) {
  color: var(--text) !important;
  opacity: 0.9;
}
.theme-switch > button.active {
  background: var(--seg-active-bg) !important;
  color: var(--seg-active-text) !important;
  box-shadow: var(--seg-shadow) !important;
}

.tabs > .tab {
  flex: 1;
  min-height: 30px;
  padding: 7px 8px !important;
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.15px;
}
.tabs > .tab:hover:not(.active) {
  color: var(--text) !important;
  opacity: 0.9;
}
.tabs > .tab.active {
  background: var(--seg-active-bg) !important;
  color: var(--seg-active-text) !important;
  font-weight: 600;
  box-shadow: var(--seg-shadow) !important;
}

/* 底部操作区里的主题切换：加高，避免过扁 */
.actions .theme-switch {
  width: 100%;
  margin-top: 4px;
  min-height: 44px;
  padding: 5px;
  border-radius: 10px;
}
.actions .theme-switch > button {
  height: 34px;
  border-radius: 7px;
}
.actions .theme-switch > button svg {
  width: 18px;
  height: 18px;
}

/* ===== Tab body (scrollable & touch-action) ===== */
.tab-body {
  flex: 1;
  overflow-y: auto;
  padding: 0 22px;
  touch-action: pan-y;
  will-change: transform, opacity;
}
.tab-body::-webkit-scrollbar { width: 6px; }
.tab-body::-webkit-scrollbar-track { background: transparent; }
.tab-body::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}
.tab-body::-webkit-scrollbar-thumb:hover { background: var(--text-faint); }

/* Tab panel slide animations */
.tab-body.slide-from-right {
  animation: tabSlideFromRight 0.35s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.tab-body.slide-from-left {
  animation: tabSlideFromLeft 0.35s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

@keyframes tabSlideFromRight {
  from {
    opacity: 0.2;
    transform: translateX(36px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
}

@keyframes tabSlideFromLeft {
  from {
    opacity: 0.2;
    transform: translateX(-36px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
}

.panel {
  padding: 6px 0 18px;
}
.panel h2 {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 14px;
  letter-spacing: 1.6px;
}

.field {
  display: flex;
  flex-direction: column;
  margin-bottom: 16px;
}
.field:last-child { margin-bottom: 0; }
.field > span {
  margin-bottom: 8px;
  color: var(--text-muted);
  font-size: 12px;
  letter-spacing: 0.2px;
  font-weight: 500;
}
.field select option[value="A4"] {
  font-weight: 700;
}

.field input[type="number"],
.field input[type="text"],
.field select,
.field textarea,
.page-header-options input[type="text"],
.page-footer-options input[type="text"] {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 9px 11px;
  font-size: 13.5px;
  font-family: inherit;
  /* 与分段控件轨道同色，侧栏层次更统一 */
  background: var(--seg-track);
  color: var(--text);
  width: 100%;
  transition: border-color 0.15s, background 0.15s, box-shadow 0.15s;
  color-scheme: inherit;
}

/* 原生 select 由自定义组件接管，仅作数据源保留 */
.field select.native-select-sr {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  border: 0 !important;
  white-space: nowrap !important;
}

/* 自定义下拉：与输入框同高、同边距，箭头距右 11px */
.custom-select {
  position: relative;
  width: 100%;
}
.custom-select-trigger {
  display: flex;
  align-items: center;
  width: 100%;
  min-height: 38px;
  margin: 0;
  padding: 9px 34px 9px 11px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background-color: var(--seg-track);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12' fill='none'%3E%3Cpath d='M2.5 4.5L6 8L9.5 4.5' stroke='%2375716a' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 11px center;
  background-size: 12px 12px;
  color: var(--text);
  font-size: 13.5px;
  font-family: inherit;
  font-weight: 400;
  text-align: left;
  line-height: 1.3;
  cursor: pointer;
  transition: border-color 0.15s, background-color 0.15s, box-shadow 0.15s;
  box-sizing: border-box;
}
.custom-select-trigger:hover {
  border-color: var(--text-faint);
}
.custom-select.is-open .custom-select-trigger,
.custom-select-trigger:focus {
  outline: none;
  border-color: var(--ink);
  background-color: var(--seg-active-bg);
  box-shadow: 0 0 0 3px var(--focus-ring);
}
.custom-select-label {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  width: 100%;
}
.custom-select-panel {
  position: fixed;
  z-index: 220;
  max-height: min(280px, calc(100vh - 24px));
  overflow-x: hidden;
  overflow-y: auto;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  box-shadow:
    0 2px 4px rgba(0, 0, 0, 0.08),
    0 8px 20px rgba(0, 0, 0, 0.14),
    0 16px 40px rgba(0, 0, 0, 0.12);
  box-sizing: border-box;
  display: none;
}
.custom-select.is-open .custom-select-panel {
  display: block;
}
.custom-select-group {
  padding: 8px 11px 4px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.4px;
  color: var(--text-muted);
  text-transform: none;
}
.custom-select-option {
  padding: 8px 11px;
  border-radius: 5px;
  font-size: 13.5px;
  line-height: 1.35;
  color: var(--text);
  cursor: pointer;
  transition: background 0.12s ease;
}
.custom-select-option:hover {
  background: var(--seg-track);
}
.custom-select-option.is-selected {
  background: var(--seg-track);
  font-weight: 600;
}
.custom-select-option.is-selected::before {
  content: none;
}
:root[data-theme="dark"] .custom-select-trigger {
  border-color: var(--border);
  background-color: var(--seg-track);
  color: var(--text);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12' fill='none'%3E%3Cpath d='M2.5 4.5L6 8L9.5 4.5' stroke='%238e8e93' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 11px center;
  background-size: 12px 12px;
}
:root[data-theme="dark"] .custom-select.is-open .custom-select-trigger,
:root[data-theme="dark"] .custom-select-trigger:focus {
  border-color: var(--border-soft);
  background-color: var(--seg-track);
  color: var(--text);
  -webkit-text-fill-color: var(--text);
}
:root[data-theme="dark"] .custom-select-panel {
  background: var(--panel);
  border-color: var(--border);
  box-shadow:
    0 4px 12px rgba(0, 0, 0, 0.4),
    0 16px 40px rgba(0, 0, 0, 0.55);
}
:root[data-theme="dark"] .custom-select-option:hover,
:root[data-theme="dark"] .custom-select-option.is-selected {
  background: var(--panel-soft);
}
.field input::placeholder,
.field textarea::placeholder,
.page-header-options input::placeholder,
.page-footer-options input::placeholder {
  color: var(--placeholder);
  opacity: 1;
}
:root[data-theme="dark"] .field input,
:root[data-theme="dark"] .field select,
:root[data-theme="dark"] .field textarea,
:root[data-theme="dark"] .page-header-options input[type="text"],
:root[data-theme="dark"] .page-footer-options input[type="text"] {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.12);
  color: var(--text);
  -webkit-text-fill-color: var(--text);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}
:root[data-theme="dark"] .field input:focus,
:root[data-theme="dark"] .field select:focus,
:root[data-theme="dark"] .field textarea:focus {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(96, 165, 250, 0.5);
  box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.18);
  outline: none;
}

:root[data-theme="dark"] .field input::placeholder,
:root[data-theme="dark"] .field textarea::placeholder,
:root[data-theme="dark"] .page-header-options input::placeholder,
:root[data-theme="dark"] .page-footer-options input::placeholder {
  color: var(--placeholder);
  -webkit-text-fill-color: var(--placeholder);
  opacity: 1;
}
.field select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2375716a' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px !important;
  cursor: pointer;
}
:root[data-theme="dark"] .field select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238e8e93' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
}
.field select option,
.field select optgroup {
  background: var(--panel);
  color: var(--text);
}
.field input:hover,
.field select:hover,
.field textarea:hover,
.page-header-options input[type="text"]:hover,
.page-footer-options input[type="text"]:hover {
  border-color: var(--text-faint);
}
.field input:focus,
.field select:focus,
.field textarea:focus,
.page-header-options input[type="text"]:focus,
.page-footer-options input[type="text"]:focus {
  outline: none;
  border-color: var(--ink);
  background: var(--seg-active-bg);
  box-shadow: 0 0 0 3px var(--focus-ring);
}
.field input[type="color"] {
  width: 100%;
  height: 34px;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px;
  background: var(--seg-track);
  cursor: pointer;
  transition: border-color 0.15s;
}
.field input[type="color"]:hover { border-color: var(--text-faint); }
.field textarea {
  resize: none;
  min-height: 88px;
  max-height: 160px;
  height: 112px;
  overflow-y: auto;
  font-family: "LXGW WenKai", "KaiTi", serif;
  font-size: 15px;
  line-height: 1.55;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 16px;
}
.grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
  margin-bottom: 16px;
}
.grid-4 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: 8px;
  margin-bottom: 16px;
}
.grid-2 .field,
.grid-3 .field,
.grid-4 .field,
.field > .grid-2,
.field > .grid-3,
.field > .grid-4 {
  margin-bottom: 0;
}

/* Modern Toggle Switch */
.switch-field {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  margin-bottom: 16px;
  font-size: 13px;
  color: var(--text);
  user-select: none;
}
.switch-field input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 38px;
  height: 22px;
  background-color: var(--switch-track);
  border: 1px solid var(--switch-border);
  border-radius: 11px;
  position: relative;
  outline: none;
  cursor: pointer;
  flex-shrink: 0;
  transition: background-color 0.2s cubic-bezier(0.4, 0, 0.2, 1),
              border-color 0.2s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.switch-field input[type="checkbox"]::before {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  background-color: var(--switch-knob);
  border-radius: 50%;
  box-shadow: var(--switch-knob-shadow);
  transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1),
              background-color 0.2s ease,
              box-shadow 0.2s ease;
}
.switch-field input[type="checkbox"]:checked {
  background-color: var(--switch-active-bg);
  border-color: var(--switch-active-border);
  box-shadow: var(--switch-active-shadow);
}
.switch-field input[type="checkbox"]:checked::before {
  transform: translateX(16px);
  background-color: var(--switch-active-knob);
}
.switch-field input[type="checkbox"]:hover {
  opacity: 0.92;
}
.switch-field input[type="checkbox"]:focus-visible {
  box-shadow: 0 0 0 3px var(--focus-ring);
}
:root[data-theme="dark"] .switch-field {
  color: var(--text);
}

.micro {
  font-size: 10.5px;
  color: var(--text-muted);
  letter-spacing: 1px;
  margin: 12px 0 8px;
  text-transform: uppercase;
  opacity: 0.9;
}

/* 每个字独占一行（共用） */
.own-row-field {
  margin-bottom: 12px;
}
.own-row-field > span {
  display: block;
  margin-bottom: 6px;
  color: var(--text-muted);
  font-size: 12px;
  letter-spacing: 0.2px;
  font-weight: 500;
}
.own-row-field .switch-field {
  margin-bottom: 0;
}

/* 笔顺选项 / 状态 */
.stroke-options {
  margin-bottom: 12px;
}
.stroke-options:empty,
.stroke-options[hidden] {
  display: none;
}

/* 笔顺加载状态 */
.stroke-status {
  font-size: 12px;
  line-height: 1.45;
  letter-spacing: 0.2px;
  margin: 8px 0 4px;
  padding: 8px 10px;
  border-radius: 6px;
  background: var(--seg-track);
  color: var(--text-muted);
  border: 1px solid var(--border-soft);
}
.stroke-status.is-error {
  color: #b45309;
  border-color: rgba(180, 83, 9, 0.35);
  background: rgba(180, 83, 9, 0.08);
}
:root[data-theme="dark"] .stroke-status {
  color: #ebe3d4;
}
:root[data-theme="dark"] .stroke-status.is-error {
  color: #fbbf24;
  border-color: rgba(251, 191, 36, 0.35);
  background: rgba(251, 191, 36, 0.1);
}

/* Header / page header / page footer options */
.section-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 16px 0 8px;
  padding-top: 0;
  border-top: none;
}
.switch-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.switch-row .switch-field {
  margin-bottom: 0;
}
.header-options,
.page-header-options,
.page-footer-options {
  display: none;
  margin-bottom: 16px;
}
.header-options.active,
.page-header-options.active,
.page-footer-options.active {
  display: block;
}
.page-header-options .micro,
.page-footer-options .micro {
  margin-top: 4px;
}
.section-title + .switch-field {
  margin-top: 0;
}

/* 与上方分组拉开一点间距（如页眉页脚高度） */
.field.field-spaced {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border-soft);
}

/* 标签旁帮助问号 + 自适应悬浮说明（JS 用 fixed 定位，避免侧栏裁切） */
.label-with-help {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 0;
}
.field > .label-with-help {
  margin-bottom: 6px;
}
.help-tip {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  cursor: help;
  outline: none;
}
.help-tip-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 1px solid var(--text-faint);
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
  line-height: 1;
  background: var(--seg-track);
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}
.help-tip.is-open .help-tip-icon,
.help-tip:hover .help-tip-icon,
.help-tip:focus .help-tip-icon {
  border-color: var(--ink);
  color: var(--text);
  background: var(--seg-active-bg);
}
.help-tip-pop {
  position: fixed;
  width: max-content;
  /* 最大宽度由 JS 按侧栏内容区（左右 22px）动态设置 */
  max-width: min(240px, calc(100vw - 44px));
  padding: 8px 10px;
  border-radius: 6px;
  background: var(--ink);
  color: var(--btn-primary-text);
  font-size: 12px;
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: 0.1px;
  text-transform: none;
  box-shadow:
    0 2px 4px rgba(0, 0, 0, 0.08),
    0 8px 20px rgba(0, 0, 0, 0.14),
    0 16px 40px rgba(0, 0, 0, 0.12);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.12s ease, visibility 0.12s ease;
  z-index: 200;
  white-space: normal;
  box-sizing: border-box;
}
.help-tip-pop::after {
  content: "";
  position: absolute;
  border: 5px solid transparent;
}
/* 箭头方向由 data-place 控制 */
.help-tip-pop[data-place="top"]::after {
  top: 100%;
  left: var(--arrow-left, 50%);
  transform: translateX(-50%);
  border-top-color: var(--ink);
}
.help-tip-pop[data-place="bottom"]::after {
  bottom: 100%;
  left: var(--arrow-left, 50%);
  transform: translateX(-50%);
  border-bottom-color: var(--ink);
}
.help-tip.is-open .help-tip-pop {
  opacity: 1;
  visibility: visible;
}
:root[data-theme="dark"] .help-tip-pop {
  background: #f5f0e6;
  color: #14120e;
  box-shadow:
    0 2px 4px rgba(0, 0, 0, 0.25),
    0 8px 24px rgba(0, 0, 0, 0.4),
    0 18px 48px rgba(0, 0, 0, 0.35);
}
:root[data-theme="dark"] .help-tip-pop[data-place="top"]::after {
  border-top-color: #f5f0e6;
}
:root[data-theme="dark"] .help-tip-pop[data-place="bottom"]::after {
  border-bottom-color: #f5f0e6;
}
:root[data-theme="dark"] .help-tip-icon {
  border-color: #7a7366;
  color: #ebe3d4;
}

/* ===== Actions（仅底部操作区，避免污染 Tab / 主题按钮） ===== */
.actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 14px 18px 16px;
  flex-shrink: 0;
  border-top: 1px solid var(--border-soft);
  margin-top: auto;
}
.actions .action-btns {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.actions .action-btns button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel);
  color: var(--text);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
  letter-spacing: 0.15px;
  transition: background 0.15s, border-color 0.15s, color 0.15s, transform 0.05s;
}
.actions .action-btns button:hover {
  background: var(--panel-soft);
  border-color: var(--text-faint);
}
.actions .action-btns button:active {
  transform: translateY(0.5px);
}
.actions .action-btns button.primary {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  border-color: var(--btn-primary-bg);
  font-weight: 600;
  font-size: 14px;
  padding: 12px 14px;
  letter-spacing: 0.4px;
}
.actions .action-btns button.primary:hover {
  background: var(--btn-primary-hover);
  border-color: var(--btn-primary-hover);
  color: var(--btn-primary-text);
}
.actions .action-btns button.secondary {
  background: var(--btn-secondary-bg);
  color: var(--btn-secondary-text);
  border-color: var(--btn-secondary-border);
  font-weight: 500;
}
.actions .action-btns button.secondary:hover {
  background: var(--btn-secondary-hover-bg);
  border-color: var(--text-faint);
  color: var(--text);
}

/* ===== Preview area ===== */
#preview {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 24px 16px;
  display: flex;
  justify-content: center;
  align-items: center;
  background: var(--preview-bg, var(--bg));
  position: relative;
}
#preview::-webkit-scrollbar { width: 8px; height: 8px; }
#preview::-webkit-scrollbar-track { background: transparent; }
#preview::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}
#preview::-webkit-scrollbar-thumb:hover { background: var(--text-faint); }

#preview-stage {
  flex-shrink: 0;
  position: relative;
  overflow: hidden;
  margin: auto;
}
#pages {
  position: absolute;
  top: 0;
  left: 0;
  display: flex;
  flex-direction: column;
  gap: 28px;
  align-items: center;
  transform-origin: top left;
}

/* ===== Sheet (paper) ===== */
.sheet {
  background: var(--paper-bg);
  color: var(--paper-text);
  box-shadow: var(--shadow-paper);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.sheet .page-content {
  width: 100%;
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
}

/* Sheet header: title + meta */
.sheet-header {
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  color: var(--paper-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  padding-bottom: 0;
  print-color-adjust: exact;
  -webkit-print-color-adjust: exact;
}
.sheet-header .sh-title {
  font-size: 9.5mm;
  font-weight: 500;
  letter-spacing: 1.2mm;
  text-align: center;
  line-height: 1.2;
  margin-bottom: 2mm;
}
.sheet-header .sh-subtitle {
  font-size: 4.8mm;
  letter-spacing: 0.4mm;
  text-align: center;
  line-height: 1.3;
  margin-bottom: 2mm;
}
.sheet-header .sheet-meta {
  display: flex;
  justify-content: space-between;
  gap: 8mm;
  width: 100%;
}
.sheet-header .meta-item {
  flex: 1;
  display: flex;
  align-items: baseline;
  gap: 1.5mm;
  font-size: 4.5mm;
  white-space: nowrap;
}
.sheet-header .meta-line {
  flex: 1;
  border-bottom: 0.5mm solid var(--paper-text);
  min-width: 12mm;
  height: 1em;
}

/* Teach mode: header / footer */
.sheet .page-header,
.sheet .page-footer {
  position: absolute;
  left: var(--m-left, 0);
  right: var(--m-right, 0);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 10pt;
  color: var(--hf-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  print-color-adjust: exact;
  -webkit-print-color-adjust: exact;
}
.sheet .page-header {
  top: var(--m-top, 0);
  height: var(--hf-h-header, 10mm);
  border-bottom: 0.4pt solid var(--hf-line);
  padding-bottom: 1mm;
}
.sheet .page-footer {
  bottom: var(--m-bottom, 0);
  height: var(--hf-h-footer, 10mm);
  border-top: 0.4pt solid var(--hf-line);
  padding-top: 1mm;
}
.sheet .page-header > span,
.sheet .page-footer > span {
  flex: 1;
  font-size: 10pt;
  line-height: 1.2;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.sheet .page-header .hc,
.sheet .page-footer .fc {
  text-align: center;
}
.sheet .page-header .hl,
.sheet .page-footer .fl { text-align: left; }
.sheet .page-header .hr,
.sheet .page-footer .fr { text-align: right; }

/* ===== Grid layout ===== */
.grid-row {
  display: flex;
  flex-shrink: 0;
}
.cell {
  position: relative;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  box-sizing: border-box;
  /* 避免打印时边框被抗锯齿糊成粗细不一 */
  print-color-adjust: exact;
  -webkit-print-color-adjust: exact;
}
.cell .char {
  position: relative;
  z-index: 2;
  line-height: 1;
  user-select: none;
  font-weight: 400;
  color: var(--paper-text);
}
/* 笔顺拆分：单层笔顺路径（无重影） */
.cell .char-stroke {
  position: relative;
  z-index: 2;
  width: 78%;
  height: 78%;
  display: block;
  pointer-events: none;
  user-select: none;
  print-color-adjust: exact;
  -webkit-print-color-adjust: exact;
}
.cell.pinyin-cell .char-stroke {
  width: 72%;
  height: 62%;
  transform: translateY(12%);
}
.cell .char-stroke path {
  print-color-adjust: exact;
  -webkit-print-color-adjust: exact;
}
.cell .char-stroke.is-trace path {
  fill: rgba(28, 27, 23, 0.55);
}
.cell .char-stroke.is-solid path {
  fill: rgba(20, 18, 15, 0.94);
}
.cell .grid-lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
  /* 辅助线颜色：JS 写入 --cell-grid-c；默认偏浅，突出笔迹 */
  color: var(--cell-grid-c, #e0e0e0);
  overflow: visible;
}
.cell .grid-lines line,
.cell .grid-lines rect {
  stroke: currentColor;
  fill: none;
}
.cell .pinyin {
  position: absolute;
  top: 6%;
  left: 0;
  right: 0;
  text-align: center;
  line-height: 1;
  color: var(--text-faint);
  z-index: 2;
  font-family: inherit;
}
.cell.pinyin-cell .char {
  transform: translateY(15%);
}

/* ===== Print ===== */
@page {
  margin: 0;
}
/* JS 在打印前会加 .is-printing，双保险去掉预览缩放 */
body.is-printing #pages {
  transform: none !important;
}
body.is-printing #preview-stage {
  width: auto !important;
  height: auto !important;
}

@media print {
  /* 解除预览布局：100vh / overflow / flex 会导致打印空白或只打首屏 */
  html, body {
    background: #fff !important;
    width: 100% !important;
    height: auto !important;
    min-height: 0 !important;
    max-height: none !important;
    overflow: visible !important;
    margin: 0 !important;
    padding: 0 !important;
  }
  body {
    display: block !important;
  }
  #controls {
    display: none !important;
  }
  #preview {
    display: block !important;
    position: static !important;
    width: auto !important;
    height: auto !important;
    max-height: none !important;
    overflow: visible !important;
    padding: 0 !important;
    margin: 0 !important;
    background: #fff !important;
    justify-content: unset !important;
    align-items: unset !important;
  }
  #preview-stage {
    display: block !important;
    width: auto !important;
    height: auto !important;
    max-width: none !important;
    max-height: none !important;
    overflow: visible !important;
    transform: none !important;
  }
  #pages {
    display: block !important;
    gap: 0 !important;
    width: auto !important;
    height: auto !important;
    overflow: visible !important;
    /* 预览缩放是 inline transform，必须 !important 盖掉，否则打印极小/空白 */
    transform: none !important;
    transform-origin: top left !important;
  }
  .sheet {
    box-shadow: none !important;
    /* hidden 在部分浏览器打印时会裁掉整页内容 */
    overflow: visible !important;
    page-break-after: always;
    break-after: page;
    page-break-inside: avoid;
    break-inside: avoid;
    background: #fff !important;
    color: #1c1b17 !important;
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }
  .sheet:last-child {
    page-break-after: auto;
    break-after: auto;
  }
  .sheet .page-content,
  .grid-row {
    overflow: visible !important;
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }
  .sheet .page-header,
  .sheet .page-footer {
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }
  /* 格子：保留 overflow hidden 以正确裁切辅助线；强制边框/线色打印 */
  .cell {
    overflow: hidden !important;
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
    /* 边框清晰、辅助线偏浅，突出笔顺墨迹 */
    --cell-border-c: #666666 !important;
    --cell-grid-c: #c8c8c8 !important;
    border-top-color: #666666 !important;
    border-right-color: #666666 !important;
    border-bottom-color: #666666 !important;
    border-left-color: #666666 !important;
  }
  .cell .char {
    color: #1c1b17 !important;
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }
  .cell .grid-lines {
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
    color: #c8c8c8 !important;
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }
  .cell .grid-lines line,
  .cell .grid-lines rect {
    stroke: #c8c8c8 !important;
    stroke-opacity: 1 !important;
    fill: none !important;
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }
  .cell .char-stroke,
  .cell .char-stroke path {
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }
  .cell .char-stroke.is-trace path {
    fill: rgba(28, 27, 23, 0.58) !important;
  }
  .cell .char-stroke.is-solid path {
    fill: rgba(20, 18, 15, 0.96) !important;
  }
}

/* ===== Mobile & Touch Responsive Styles ===== */
@media (max-width: 767.98px) {
  body {
    flex-direction: column;
  }

  /* 移动端顶栏（无背景纯净高颜值左上角 Header） */
  #mobile-header {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding: calc(22px + var(--safe-top, 0px)) 20px 8px;
    background: transparent;
    border-bottom: none;
    flex-shrink: 0;
    z-index: 90;
    box-shadow: none;
  }
  .mobile-brand {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 10px;
  }
  .mobile-brand h1 {
    font-size: 21px;
    font-weight: 700;
    color: var(--text);
    letter-spacing: 0.8px;
    margin: 0;
    line-height: 1.2;
    display: flex;
    align-items: center;
  }

  /* 移动端底部 Apple Liquid Glass (流体玻璃) 悬浮菜单栏 */
  .mobile-floating-dock {
    position: fixed;
    bottom: calc(16px + var(--safe-bottom, 0px));
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 180;
    pointer-events: none;
  }

  .dock-container {
    pointer-events: auto;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: blur(28px) saturate(190%);
    -webkit-backdrop-filter: blur(28px) saturate(190%);
    border: 1px solid rgba(255, 255, 255, 0.65);
    border-radius: 38px;
    box-shadow: 
      0 16px 36px -8px rgba(0, 0, 0, 0.12),
      0 6px 16px -4px rgba(0, 0, 0, 0.06),
      inset 0 1px 1.5px rgba(255, 255, 255, 0.9),
      inset 0 -1px 1px rgba(0, 0, 0, 0.03);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  }

  :root[data-theme="dark"] .dock-container {
    background: rgba(24, 22, 18, 0.76);
    border-color: rgba(255, 255, 255, 0.14);
    box-shadow: 
      0 20px 40px -10px rgba(0, 0, 0, 0.55),
      0 8px 18px -4px rgba(0, 0, 0, 0.35),
      inset 0 1px 1px rgba(255, 255, 255, 0.18),
      inset 0 -1px 1px rgba(0, 0, 0, 0.4);
  }

  .dock-item {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    min-width: 58px;
    height: 48px;
    padding: 4px 10px;
    border-radius: 20px;
    border: none;
    background: transparent;
    color: var(--text);
    cursor: pointer;
    transition: transform 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275), background 0.2s ease, box-shadow 0.2s ease;
    -webkit-tap-highlight-color: transparent;
    position: relative;
  }

  .dock-item:active {
    transform: scale(0.91);
    background: rgba(0, 0, 0, 0.05);
  }
  :root[data-theme="dark"] .dock-item:active {
    background: rgba(255, 255, 255, 0.08);
  }

  /* 结合字帖生成器原生的墨色主主题与高亮软胶囊 */
  .dock-item.primary {
    background: var(--btn-primary-bg) !important;
    color: var(--btn-primary-text) !important;
    padding: 4px 18px;
    border-radius: 24px;
    box-shadow: 
      0 6px 16px -2px rgba(0, 0, 0, 0.25),
      inset 0 1px 1px rgba(255, 255, 255, 0.25);
  }
  .dock-item.primary svg {
    stroke: var(--btn-primary-text) !important;
  }
  .dock-item.primary .dock-item-label {
    color: var(--btn-primary-text) !important;
  }
  .dock-item.primary:active {
    background: var(--btn-primary-hover) !important;
    transform: scale(0.93);
    box-shadow: 0 2px 8px -1px rgba(0, 0, 0, 0.2);
  }

  .dock-icon-wrapper,
  .dock-icon-wrapper svg,
  .dock-item svg {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    stroke: currentColor;
  }

  .dock-item-label {
    font-size: 11px;
    font-weight: 600;
    line-height: 1;
    letter-spacing: 0.2px;
  }

  /* 抽屉遮罩 */
  .drawer-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 200;
  }
  .drawer-backdrop.active {
    opacity: 1;
    pointer-events: auto;
  }

  /* 抽屉（#controls 转型为滑动 Bottom Sheet） */
  #controls {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    top: auto;
    width: 100%;
    height: 82vh;
    max-height: calc(100dvh - 36px);
    border-radius: 20px 20px 0 0;
    border-right: none;
    border-top: 1px solid var(--border);
    z-index: 300;
    background: var(--panel);
    backdrop-filter: blur(28px) saturate(180%);
    -webkit-backdrop-filter: blur(28px) saturate(180%);
    transform: translateY(100%);
    transition: transform 0.32s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 -12px 40px rgba(0, 0, 0, 0.35);
    padding-bottom: 0;
  }
  #controls.open {
    transform: translateY(0);
  }

  /* 抽屉把手与顶栏 */
  .drawer-handle {
    display: block !important;
    position: absolute;
    top: 7px;
    left: 50%;
    transform: translateX(-50%);
    width: 38px;
    height: 4px;
    border-radius: 2px;
    background: var(--text-faint);
    margin: 0;
    flex-shrink: 0;
    opacity: 0.5;
    pointer-events: none;
  }
  .drawer-top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 18px 4px;
    flex-shrink: 0;
  }
  .drawer-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
  }
  .drawer-close-btn {
    background: var(--seg-track);
    border: none;
    color: var(--text-muted);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
    -webkit-tap-highlight-color: transparent;
  }
  .drawer-close-btn:active {
    transform: scale(0.92);
    background: var(--border);
  }

  /* 移动端侧栏内 header 微调 */
  #controls header {
    padding: 20px 20px 12px;
  }

  /* 移动端防 iOS input 放大与触控尺寸 */
  .swipe-guide-banner {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0 20px 10px;
    padding: 8px 12px 8px 14px;
    background: var(--seg-track);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text);
    font-size: 12px;
    font-weight: 500;
    line-height: 1.4;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    animation: bannerFadeIn 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  }
  .swipe-guide-banner[hidden] {
    display: none !important;
  }
  .swipe-hand-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--btn-primary-bg, #4f46e5);
    flex-shrink: 0;
    animation: swipeHandAnim 1.8s cubic-bezier(0.45, 0, 0.55, 1) infinite;
  }
  .swipe-guide-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 14px;
    cursor: pointer;
    padding: 2px 6px;
    margin-left: auto;
    flex-shrink: 0;
    border-radius: 4px;
  }
  .swipe-guide-close:active {
    background: rgba(0, 0, 0, 0.08);
  }
  @keyframes swipeHandAnim {
    0% { transform: translateX(0); }
    25% { transform: translateX(-6px); }
    50% { transform: translateX(6px); }
    75% { transform: translateX(-3px); }
    100% { transform: translateX(0); }
  }
  @keyframes bannerFadeIn {
    from {
      opacity: 0;
      transform: translateY(-6px) scale(0.96);
    }
    to {
      opacity: 1;
      transform: translateY(0) scale(1);
    }
  }

  .tabs {
    margin: 0 20px 12px;
  }
  .tabs > .tab {
    min-height: 38px;
    font-size: 13.5px;
  }
  .tab-body {
    padding: 0 20px;
  }
  .field select,
  .field input[type="text"],
  .field input[type="number"],
  .field textarea,
  .page-header-options input[type="text"],
  .page-footer-options input[type="text"] {
    font-size: 16px !important; /* 防 iOS focus 自动放大 */
    min-height: 44px;
    padding: 10px 12px;
  }
  .field input[type="color"] {
    height: 44px;
  }
  .switch-field {
    min-height: 44px;
    font-size: 14px;
    padding: 4px 0;
  }
  .switch-field input[type="checkbox"] {
    width: 38px !important;
    height: 22px !important;
  }
  .actions {
    padding: 10px 16px max(10px, var(--safe-bottom, 0px));
  }
  .actions .action-btns {
    flex-direction: row;
    align-items: center;
    gap: 8px;
  }
  .actions .action-btns button {
    flex: 1;
    min-width: 0;
    min-height: 44px;
    font-size: 14px;
    padding: 8px 6px;
    white-space: nowrap;
  }
  .actions .theme-switch {
    display: none;
  }
  .mobile-only-btn {
    display: flex !important;
    align-items: center;
    justify-content: center;
    gap: 6px;
    width: auto;
  }
  .desktop-only-btn {
    display: none !important;
  }

  /* 移动端主题下拉菜单 */
  .mobile-theme-dropdown {
    position: relative;
    display: inline-block;
  }
  .mobile-theme-menu {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    min-width: 124px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.16);
    padding: 5px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    z-index: 100;
    transform-origin: top right;
    animation: menuFadeIn 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  }
  .mobile-theme-menu[hidden] {
    display: none;
  }
  .mobile-floating-dock .mobile-theme-menu {
    top: auto;
    bottom: calc(100% + 10px);
    left: 0;
    right: auto;
    transform-origin: bottom left;
    animation: menuFadeUp 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  }
  @keyframes menuFadeUp {
    from {
      opacity: 0;
      transform: scale(0.92) translateY(6px);
    }
    to {
      opacity: 1;
      transform: scale(1) translateY(0);
    }
  }
  @keyframes menuFadeIn {
    from {
      opacity: 0;
      transform: scale(0.92) translateY(-4px);
    }
    to {
      opacity: 1;
      transform: scale(1) translateY(0);
    }
  }
  .theme-menu-item {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 8px 10px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 500;
    border-radius: 8px;
    cursor: pointer;
    text-align: left;
    transition: background 0.15s, color 0.15s;
    -webkit-tap-highlight-color: transparent;
  }
  .theme-menu-item:hover,
  .theme-menu-item:active,
  .theme-menu-item.active {
    background: var(--seg-track);
    color: var(--text);
  }

  /* 预览区自适应与垂直居中填充 */
  #preview {
    flex: 1;
    width: 100%;
    height: auto;
    min-height: 0;
    padding: 12px 8px calc(76px + var(--safe-bottom, 0px));
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--preview-bg, var(--bg));
    overflow-y: auto;
    overflow-x: hidden;
  }
  #preview-stage {
    margin: auto;
    overflow: visible;
    background: transparent;
  }
}

/* 平板与折叠屏适配 (768px ~ 1024px) */
@media (min-width: 768px) and (max-width: 1024px) {
  #controls {
    width: 280px;
  }
  #preview {
    padding: 24px;
  }
  .field input[type="text"],
  .field input[type="number"],
  .field select {
    min-height: 38px;
  }
  .actions button {
    min-height: 42px;
  }
}

/* ===== 极奢深色模式 (Midnight Deluxe Dark Mode Refinements) ===== */
:root[data-theme="dark"] #mobile-header {
  background: rgba(10, 11, 14, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

:root[data-theme="dark"] .drawer-handle {
  background: rgba(255, 255, 255, 0.28);
}

:root[data-theme="dark"] .actions .action-btns button.primary {
  background: rgba(255, 255, 255, 0.23) !important;
  color: #ffffff !important;
  border: 1px solid rgba(255, 255, 255, 0.14) !important;
  box-shadow: var(--seg-shadow) !important;
}

:root[data-theme="dark"] .actions .action-btns button.primary:active {
  background: rgba(255, 255, 255, 0.32) !important;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3) !important;
}

:root[data-theme="dark"] .actions .action-btns button:not(.primary) {
  background: rgba(255, 255, 255, 0.08) !important;
  border: 1px solid rgba(255, 255, 255, 0.12) !important;
  color: #f1f5f9 !important;
}

:root[data-theme="dark"] .actions .action-btns button:not(.primary):active {
  background: rgba(255, 255, 255, 0.14) !important;
  color: #ffffff !important;
}


:root[data-theme="dark"] .mobile-theme-menu {
  background: rgba(20, 22, 28, 0.92);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-color: rgba(255, 255, 255, 0.14);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.6);
}