/* css/base.css - Design tokens, themes, reset, base typography & app shell */
:root {
  --accent: #E8344E;
  --accent-hover: #D02B43;
  --accent-subtle: rgba(232, 52, 78, 0.1);
  --accent-glow: rgba(232, 52, 78, 0.25);
  --accent-text: #FFFFFF;
  --success: #2EA043;
  --warning: #F59E0B;
  --info: #0969DA;
  
  --bg-base: #F8F9FA;
  --bg-surface: #FFFFFF;
  --bg-card: #FFFFFF;
  --bg-muted: #F1F3F5;
  --bg-input: #FFFFFF;
  --text-primary: #1F2328;
  --text-secondary: #57606A;
  --text-muted: #8C959F;
  --border-color: #E1E4E8;
  --border-light: #ECEFF2;
  --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  --sheet-shadow: 0 -8px 32px rgba(0, 0, 0, 0.12);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  
  --font-hanzi: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-kanji: "Noto Sans JP", "Yu Gothic", sans-serif;
  --font-ui: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  
  --reader-font-size: 28px;
  --top-bar-height: 56px;
  --bottom-bar-height: 64px;
}

[data-theme="dark"] {
  --bg-base: #0D1117;
  --bg-surface: #161B22;
  --bg-card: #1B2129;
  --bg-muted: #21262D;
  --bg-input: #12161C;
  --text-primary: #F0F6FC;
  --text-secondary: #8B949E;
  --text-muted: #6E7681;
  --border-color: #30363D;
  --border-light: #21262D;
  --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
  --sheet-shadow: 0 -8px 32px rgba(0, 0, 0, 0.55);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  width: 100%;
  height: 100%;
  height: 100dvh;
  overflow: hidden;
  background-color: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: 15px;
  line-height: 1.5;
  user-select: none;
  -webkit-font-smoothing: antialiased;
}

html[lang="ja"] {
  font-family: var(--font-kanji), var(--font-ui);
}

[lang="zh-CN"], .token-chars, #sheet-hanzi-title, .dict-hanzi, .sentence-content, .full-text-container, #input-textarea, #ocr-edit-textarea {
  font-family: var(--font-hanzi);
}

button, .btn, .icon-btn, .word-token, .tab-item, .filter-chip {
  touch-action: manipulation;
}

input, textarea, select, .search-input, .textarea-box {
  font-size: 16px;
}

button, input, textarea, select {
  font-family: inherit;
  color: inherit;
}

/* App Shell Layout */
#app-shell {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  height: 100dvh;
  max-width: 860px;
  margin: 0 auto;
  position: relative;
  background-color: var(--bg-base);
  border-left: 1px solid var(--border-light);
  border-right: 1px solid var(--border-light);
}

/* Top Bar */
#top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: calc(var(--top-bar-height) + env(safe-area-inset-top, 0px));
  padding: 0 16px;
  padding-top: env(safe-area-inset-top, 0px);
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  z-index: 100;
  box-shadow: 0 1px 3px rgba(0,0,0,0.02);
}

.brand-badge {
  display: flex;
  align-items: center;
  gap: 9px;
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  transition: opacity 0.2s ease, transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.brand-badge:hover {
  opacity: 0.9;
}

.brand-badge:active {
  transform: scale(0.96);
}

.brand-icon {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, #E8344E 0%, #FF4D6D 100%);
  color: #FFFFFF;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-ui);
  font-weight: 800;
  font-size: 13px;
  letter-spacing: 0.4px;
  box-shadow: 0 3px 10px rgba(232, 52, 78, 0.28);
  flex-shrink: 0;
}

.brand-title {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.3px;
  color: var(--text-primary);
  white-space: nowrap;
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Modern Language Segmented Switcher */
.top-lang-group {
  display: inline-flex;
  align-items: center;
  background: var(--bg-muted);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2.5px;
  gap: 2px;
}

.top-lang-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.3px;
  padding: 4px 9px;
  border-radius: 14px;
  cursor: pointer;
  transition: all 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  -webkit-tap-highlight-color: transparent;
  line-height: 1.2;
}

.top-lang-btn:hover {
  color: var(--text-primary);
}

.top-lang-btn.active {
  background: var(--accent);
  color: #FFFFFF !important;
  box-shadow: 0 2px 8px rgba(232, 52, 78, 0.35);
  transform: scale(1.02);
}

.top-lang-btn:active {
  transform: scale(0.95);
}

.icon-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: 9px;
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  -webkit-tap-highlight-color: transparent;
}

.icon-btn:hover {
  background-color: var(--bg-muted);
  color: var(--text-primary);
  border-color: var(--border-focus);
}

.icon-btn:active {
  transform: scale(0.92);
}

@keyframes speakerPulse {
  0% { transform: scale(1); color: var(--accent); }
  50% { transform: scale(1.18); color: #FF4757; }
  100% { transform: scale(1); color: var(--accent); }
}

.is-speaking {
  animation: speakerPulse 0.75s ease-in-out infinite !important;
  color: var(--accent) !important;
  border-color: var(--accent) !important;
}

.lang-pill-btn {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  background: var(--bg-muted);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.2s;
}

/* Main Content Area */
#main-content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  position: relative;
  -webkit-overflow-scrolling: touch;
  padding-bottom: calc(var(--bottom-bar-height) + env(safe-area-inset-bottom, 0) + 16px);
}

/* View Container */
.view {
  display: none;
  padding: 16px;
  animation: fadeIn 0.2s ease;
}

.view.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}