/**
 * youth-chat.css — 心青年无障碍聊天 UI 样式
 *
 * 设计原则：
 * - 超大触控目标（44px+ 最小触摸区域）
 * - 高对比度、大字体（16px+ 正文）
 * - 暖色调、柔和圆角、充足间距
 * - 移动端防缩放（viewport + 输入聚焦控制）
 * - 安全区适配（safe-area-inset）
 */

/* ==========================================================
   CSS 变量
   ========================================================== */
:root {
  --youth-bg: #FFF8F0;
  --youth-surface: #FFFFFF;
  --youth-primary: #FF8C42;
  --youth-primary-hover: #E67A35;
  --youth-primary-text: #FFFFFF;
  --youth-accent-green: #4CAF50;
  --youth-accent-blue: #5B9BD5;
  --youth-accent-pink: #E87DA0;
  --youth-text: #3D3327;
  --youth-text-secondary: #8B7E6E;
  --youth-bubble-ai: #FFF3E6;
  --youth-bubble-ai-border: #FFDFB8;
  --youth-bubble-user: #FF8C42;
  --youth-bubble-user-text: #FFFFFF;
  --youth-border: #F0E6DA;
  --youth-shadow: 0 2px 12px rgba(0,0,0,0.06);
  --youth-radius-lg: 20px;
  --youth-radius-md: 14px;
  --youth-font-size-base: 17px;
  --youth-font-size-lg: 19px;
  --youth-font-size-sm: 14px;
  --youth-nav-height: 64px;
  --youth-input-height: 72px;
}

/* ==========================================================
   页面容器 — 全高 + 安全区 + 覆盖全局样式
   ========================================================== */
#youth-chat.page-section {
  display: none;
}

#youth-chat.page-section.active {
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  min-height: 100dvh;
  height: 100dvh;
  background: var(--youth-bg);
  z-index: 999;
  padding: 0;
  margin: 0;
}

/* 进入心青年聊天时隐藏全局顶栏和 FAB */
#youth-chat.page-section.active ~ #app-topbar,
body:has(#youth-chat.page-section.active) #app-topbar {
  display: none !important;
}

body:has(#youth-chat.page-section.active) #fab-container {
  display: none !important;
}

/* ==========================================================
   顶部栏
   ========================================================== */
.youth-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  padding-top: calc(12px + env(safe-area-inset-top, 0px));
  background: var(--youth-surface);
  border-bottom: 1px solid var(--youth-border);
  flex-shrink: 0;
  position: sticky;
  top: 0;
  z-index: 10;
}

.youth-topbar-title {
  font-size: var(--youth-font-size-lg);
  font-weight: 700;
  color: var(--youth-text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.youth-topbar-title .youth-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, #FFB84D, #FF8C42);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.youth-topbar-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* TTS 开关按钮 */
.youth-tts-toggle {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 2px solid var(--youth-border);
  background: var(--youth-surface);
  font-size: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  -webkit-tap-highlight-color: transparent;
}

.youth-tts-toggle:active {
  transform: scale(0.92);
  background: #FFF3E6;
}

.youth-tts-toggle.on {
  border-color: var(--youth-primary);
  background: #FFF3E6;
}

.youth-tts-toggle.off {
  opacity: 0.45;
  border-color: var(--youth-border);
}

/* ==========================================================
   消息列表 — 可滚动区域
   ========================================================== */
.youth-messages {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 16px;
  padding-bottom: 8px;
  -webkit-overflow-scrolling: touch;
  scroll-behavior: smooth;
}

/* 欢迎区域 */
.youth-welcome {
  text-align: center;
  padding: 32px 16px 24px;
}

.youth-welcome-emoji {
  font-size: 64px;
  margin-bottom: 12px;
  animation: wave 2s ease-in-out infinite;
}

@keyframes wave {
  0%, 100% { transform: rotate(0deg); }
  25% { transform: rotate(8deg); }
  75% { transform: rotate(-8deg); }
}

.youth-welcome-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--youth-text);
  margin-bottom: 8px;
}

.youth-welcome-sub {
  font-size: var(--youth-font-size-base);
  color: var(--youth-text-secondary);
  line-height: 1.6;
}

/* ==========================================================
   消息气泡
   ========================================================== */
.youth-msg {
  display: flex;
  margin-bottom: 20px;
  animation: msgSlideIn 0.3s ease-out;
}

.youth-msg.ai {
  justify-content: flex-start;
}

.youth-msg.user {
  justify-content: flex-end;
}

@keyframes msgSlideIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.youth-bubble {
  max-width: 82%;
  padding: 14px 18px;
  border-radius: var(--youth-radius-md);
  font-size: var(--youth-font-size-base);
  line-height: 1.65;
  word-break: break-word;
  position: relative;
  -webkit-text-size-adjust: 100%;
}

/* AI 气泡 */
.youth-msg.ai .youth-bubble {
  background: var(--youth-bubble-ai);
  border: 1.5px solid var(--youth-bubble-ai-border);
  color: var(--youth-text);
  border-bottom-left-radius: 4px;
  box-shadow: var(--youth-shadow);
}

/* 用户气泡 */
.youth-msg.user .youth-bubble {
  background: var(--youth-bubble-user);
  color: var(--youth-bubble-user-text);
  border-bottom-right-radius: 4px;
  box-shadow: 0 2px 12px rgba(255,140,66,0.25);
}

/* ==========================================================
   TTS 朗读指示器
   ========================================================== */
.youth-tts-indicator {
  display: none;
  align-items: center;
  gap: 3px;
  margin-left: 8px;
  padding: 4px 8px;
  background: rgba(255,140,66,0.12);
  border-radius: 10px;
  font-size: 12px;
  color: var(--youth-primary);
  vertical-align: middle;
}

.youth-tts-indicator .tts-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--youth-primary);
  animation: ttsPulse 0.6s ease-in-out infinite;
}

.youth-tts-indicator .tts-dot:nth-child(2) {
  animation-delay: 0.15s;
}

.youth-tts-indicator .tts-dot:nth-child(3) {
  animation-delay: 0.3s;
}

@keyframes ttsPulse {
  0%, 100% { opacity: 0.3; transform: scale(0.8); }
  50% { opacity: 1; transform: scale(1.3); }
}

/* ==========================================================
   快捷回复按钮行
   ========================================================== */
.youth-quick-replies {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 16px 10px;
}

.youth-quick-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 8px 14px;
  border-radius: 24px;
  border: 1.5px solid var(--youth-border);
  background: var(--youth-surface);
  font-size: 14px;
  font-weight: 500;
  color: var(--youth-text);
  cursor: pointer;
  white-space: nowrap;
  min-height: 40px;
  transition: all 0.2s ease;
  -webkit-tap-highlight-color: transparent;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.youth-quick-btn:active {
  transform: scale(0.95);
  background: #FFF3E6;
  border-color: var(--youth-primary);
}

/* ==========================================================
   表情按钮区 (Emoji Feelings)
   ========================================================== */
.youth-emoji-bar {
  display: flex;
  justify-content: center;
  gap: 10px;
  padding: 6px 12px 8px;
}

.youth-emoji-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  min-width: 56px;
  min-height: 60px;
  padding: 6px 4px;
  border-radius: var(--youth-radius-md);
  border: 2px solid var(--youth-border);
  background: var(--youth-surface);
  cursor: pointer;
  transition: all 0.2s ease;
  -webkit-tap-highlight-color: transparent;
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}

.youth-emoji-btn:active {
  transform: scale(0.93);
}

.youth-emoji-btn .emoji-icon {
  font-size: 32px;
  line-height: 1;
}

.youth-emoji-btn .emoji-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--youth-text-secondary);
}

/* 各情绪按钮颜色强调 */
.youth-emoji-btn.happy:active {
  border-color: #FFB84D;
  background: #FFF8EC;
}

.youth-emoji-btn.sad:active {
  border-color: #87CEEB;
  background: #F0F8FF;
}

.youth-emoji-btn.angry:active {
  border-color: #E87DA0;
  background: #FFF0F4;
}

.youth-emoji-btn.worried:active {
  border-color: #C4A2E6;
  background: #F8F2FF;
}

.youth-emoji-btn.calm:active {
  border-color: #7EC8A0;
  background: #F2FAF5;
}

/* ==========================================================
   底部输入区 — Sticky 固定
   ========================================================== */
.youth-input-area {
  flex-shrink: 0;
  position: sticky;
  bottom: 0;
  background: var(--youth-surface);
  border-top: 1px solid var(--youth-border);
  padding: 10px 16px;
  padding-bottom: calc(10px + env(safe-area-inset-bottom, 0px));
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 10;
}

/* 文字输入框 */
.youth-text-input {
  flex: 1;
  min-height: 48px;
  max-height: 96px;
  padding: 12px 16px;
  border: 2px solid var(--youth-border);
  border-radius: 24px;
  font-size: var(--youth-font-size-base);
  font-family: inherit;
  color: var(--youth-text);
  background: #FAF7F2;
  outline: none;
  resize: none;
  -webkit-appearance: none;
  -webkit-text-size-adjust: 100%;
  /* 禁止 iOS 聚焦放大 */
  font-size: 16px !important; /* 不小于 16px 防 iOS 自动缩放 */
}

.youth-text-input:focus {
  border-color: var(--youth-primary);
  background: var(--youth-surface);
  box-shadow: 0 0 0 3px rgba(255,140,66,0.12);
}

.youth-text-input::placeholder {
  color: #C4B8A8;
  font-size: 15px;
}

/* 发送按钮 */
.youth-send-btn {
  width: 48px;
  height: 48px;
  min-width: 48px;
  border-radius: 50%;
  border: none;
  background: var(--youth-primary);
  color: white;
  font-size: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  -webkit-tap-highlight-color: transparent;
  box-shadow: 0 2px 8px rgba(255,140,66,0.3);
}

.youth-send-btn:active {
  transform: scale(0.9);
  background: var(--youth-primary-hover);
}

.youth-send-btn:disabled {
  opacity: 0.4;
  cursor: default;
  box-shadow: none;
}

/* ==========================================================
   打字中指示器
   ========================================================== */
.youth-typing {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 14px 18px;
}

.youth-typing .typing-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #D4C4AE;
  animation: typingBounce 1.2s ease-in-out infinite;
}

.youth-typing .typing-dot:nth-child(2) { animation-delay: 0.2s; }
.youth-typing .typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-6px); opacity: 1; }
}

/* ==========================================================
   响应式适配
   ========================================================== */

/* 平板及以上 — 限制最大宽度 */
@media (min-width: 600px) {
  #youth-chat.page-section.active {
    max-width: 500px;
    margin: 0 auto;
  }

  .youth-emoji-bar {
    gap: 16px;
    padding: 12px 24px 16px;
  }

  .youth-emoji-btn {
    min-width: 68px;
    min-height: 72px;
  }

  .youth-emoji-btn .emoji-icon {
    font-size: 34px;
  }
}

/* ==========================================================
   无障碍
   ========================================================== */

@media (prefers-reduced-motion: reduce) {
  .youth-msg {
    animation: none;
  }
  .youth-welcome-emoji {
    animation: none;
  }
  .tts-dot {
    animation: none;
  }
}