*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:#f0f2f5;color:#333;min-height:100vh}
.page{display:none;min-height:100vh}
.page.active{display:block}

/* 登录页 */
#loginPage.active{display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%)}
.login-box{background:#fff;border-radius:20px;padding:48px 40px;width:420px;box-shadow:0 20px 60px rgba(0,0,0,.2)}
.login-title{text-align:center;font-size:28px;font-weight:700;color:#4A90D9;margin-bottom:8px}
.login-sub{text-align:center;color:#999;font-size:14px;margin-bottom:32px}
.form-group{margin-bottom:20px}
.form-label{display:block;font-size:14px;color:#666;margin-bottom:8px;font-weight:500}
.form-input{width:100%;padding:14px 16px;border:1px solid #e8e8e8;border-radius:10px;font-size:15px;outline:none;transition:all .2s}
.form-input:focus{border-color:#4A90D9;box-shadow:0 0 0 3px rgba(74,144,217,.1)}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 24px;border:none;border-radius:10px;font-size:15px;font-weight:500;cursor:pointer;transition:all .2s;text-decoration:none}
.btn-primary{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;width:100%;padding:14px}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(102,126,234,.4)}
.btn-primary:disabled{background:#ccc;cursor:not-allowed;transform:none;box-shadow:none}
.btn-success{background:#52C41A;color:#fff}
.btn-error{background:#FF4D4F;color:#fff}
.btn-default{background:#f5f5f5;color:#666;border:1px solid #e8e8e8}
.btn-default:hover{background:#e8e8e8}
.btn-sm{padding:8px 16px;font-size:13px}
.login-tip{text-align:center;margin-top:20px;font-size:13px;color:#999;line-height:1.6}

/* 通用布局 */
.header{background:#fff;padding:0 32px;height:64px;display:flex;align-items:center;justify-content:space-between;box-shadow:0 2px 12px rgba(0,0,0,.06);position:sticky;top:0;z-index:100}
.header-left{display:flex;align-items:center;gap:20px}
.header-logo{font-size:20px;font-weight:700;background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.header-back{cursor:pointer;color:#666;font-size:14px;display:flex;align-items:center;gap:4px;padding:6px 12px;border-radius:8px;transition:all .2s}
.header-back:hover{color:#4A90D9;background:#f0f7ff}
.header-right{display:flex;align-items:center;gap:16px}
.header-user{display:flex;align-items:center;gap:10px;cursor:pointer;padding:6px 12px;border-radius:10px;transition:all .2s}
.header-user:hover{background:#f5f5f5}
.header-avatar{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,#667eea,#764ba2);display:flex;align-items:center;justify-content:center;font-size:18px;color:#fff}
.header-name{font-size:14px;color:#333;font-weight:500}
.container{max-width:1200px;margin:0 auto;padding:28px 32px}

/* 首页 */
.welcome{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);border-radius:16px;padding:36px;color:#fff;margin-bottom:24px;position:relative;overflow:hidden}
.welcome::after{content:"📚";position:absolute;right:40px;top:50%;transform:translateY(-50%);font-size:80px;opacity:.2}
.welcome h2{font-size:26px;margin-bottom:8px}
.welcome p{opacity:.9;font-size:14px}
.stat-row{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:28px}
.stat-card{background:#fff;border-radius:14px;padding:24px;box-shadow:0 2px 12px rgba(0,0,0,.06);text-align:center;transition:all .2s}
.stat-card:hover{transform:translateY(-3px);box-shadow:0 6px 20px rgba(0,0,0,.1)}
.stat-num{font-size:34px;font-weight:700;background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.stat-label{font-size:13px;color:#999;margin-top:6px}
.module-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.module-card{background:#fff;border-radius:16px;padding:32px;box-shadow:0 2px 12px rgba(0,0,0,.06);cursor:pointer;transition:all .25s;border:2px solid transparent;position:relative;overflow:hidden}
.module-card:hover{transform:translateY(-5px);box-shadow:0 10px 30px rgba(0,0,0,.12);border-color:#667eea}
.module-card::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,#667eea,#764ba2);transform:scaleX(0);transition:transform .3s}
.module-card:hover::before{transform:scaleX(1)}
.module-icon{font-size:52px;margin-bottom:18px}
.module-title{font-size:20px;font-weight:600;margin-bottom:8px;color:#333}
.module-desc{font-size:13px;color:#999;margin-bottom:18px;line-height:1.6}
.module-stat{display:flex;gap:10px;flex-wrap:wrap}
.module-stat span{background:#f0f7ff;padding:5px 12px;border-radius:14px;color:#4A90D9;font-size:12px;font-weight:500}

/* 选择页 */
.select-header{margin-bottom:24px}
.select-header h2{font-size:24px;margin-bottom:8px;color:#333}
.select-header p{color:#999;font-size:14px}
.filter-bar{display:flex;gap:12px;margin-bottom:24px;flex-wrap:wrap}
.filter-select{padding:10px 16px;border:1px solid #e8e8e8;border-radius:10px;font-size:14px;outline:none;background:#fff;cursor:pointer;transition:all .2s;min-width:140px}
.filter-select:focus{border-color:#4A90D9}
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}
.item-card{background:#fff;border-radius:14px;padding:24px;box-shadow:0 2px 12px rgba(0,0,0,.06);cursor:pointer;transition:all .2s;border:2px solid transparent}
.item-card:hover{border-color:#667eea;transform:translateY(-3px);box-shadow:0 6px 20px rgba(0,0,0,.1)}
.item-title{font-size:17px;font-weight:600;margin-bottom:8px;color:#333}
.item-meta{font-size:12px;color:#999;line-height:1.6}
.mode-tabs{display:flex;flex-wrap:nowrap;gap:8px;margin-bottom:28px;width:100%}
.mode-tab{flex:1;min-width:0;text-align:center;padding:12px 6px;border-radius:12px;background:#fff;border:1px solid #e8e8e8;cursor:pointer;font-size:13px;font-weight:500;white-space:nowrap;transition:all .2s;color:#666}
.mode-tab-entry{border-color:#52C41A;background:#f6ffed;color:#389e0d}
.mode-tab-entry:hover{background:#52C41A;color:#fff;border-color:#52C41A;transform:translateY(-2px);box-shadow:0 4px 12px rgba(82,196,26,.3)}
.mode-tab.active{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border-color:transparent;box-shadow:0 4px 12px rgba(102,126,234,.3)}
.mode-tab:hover:not(.active){border-color:#667eea;color:#667eea}

/* 学习页 */
.study-area{background:#fff;border-radius:16px;padding:48px 40px;box-shadow:0 2px 12px rgba(0,0,0,.06);min-height:520px;display:flex;flex-direction:column;align-items:center;justify-content:center}
.progress-bar{width:100%;height:8px;background:#f0f0f0;border-radius:4px;margin-bottom:28px;overflow:hidden}
.progress-fill{height:100%;background:linear-gradient(90deg,#667eea,#764ba2);border-radius:4px;transition:width .3s}
.progress-text{font-size:14px;color:#999;margin-bottom:20px;font-weight:500}
.word-display{text-align:center;margin-bottom:32px}
.word-main{font-size:52px;font-weight:700;color:#333;margin-bottom:10px;letter-spacing:2px}
.word-phonetic{font-size:18px;color:#999;margin-bottom:14px}
.word-meaning{font-size:22px;color:#555;margin-bottom:10px}
.word-example{font-size:15px;color:#999;font-style:italic;max-width:600px;line-height:1.6}
.audio-btn{background:#f0f7ff;border:none;padding:12px 24px;border-radius:24px;font-size:16px;cursor:pointer;margin:0 8px;transition:all .2s;color:#4A90D9;display:inline-flex;align-items:center;gap:6px;white-space:nowrap}
.audio-btn:hover{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;transform:scale(1.05);box-shadow:0 4px 12px rgba(102,126,234,.3)}
.action-row{display:flex;gap:16px;margin-top:36px}
.feedback-btn{padding:14px 36px;border-radius:10px;border:2px solid;font-size:15px;font-weight:500;cursor:pointer;transition:all .2s;background:#fff}
.feedback-btn.know{border-color:#52C41A;color:#52C41A}
.feedback-btn.know:hover{background:#52C41A;color:#fff;box-shadow:0 4px 12px rgba(82,196,26,.3)}
.feedback-btn.vague{border-color:#FAAD14;color:#FAAD14}
.feedback-btn.vague:hover{background:#FAAD14;color:#fff;box-shadow:0 4px 12px rgba(250,173,20,.3)}
.feedback-btn.unknown{border-color:#FF4D4F;color:#FF4D4F}
.feedback-btn.unknown:hover{background:#FF4D4F;color:#fff;box-shadow:0 4px 12px rgba(255,77,79,.3)}

/* 选项 */
.options-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;max-width:520px;width:100%;margin-top:28px}
.option-btn{padding:22px;border:2px solid #e8e8e8;border-radius:12px;background:#fff;font-size:18px;cursor:pointer;transition:all .2s;text-align:center;font-weight:500}
.option-btn:hover{border-color:#667eea;background:#f8f9ff}
.option-btn.correct{border-color:#52C41A;background:#f6ffed;color:#52C41A}
.option-btn.wrong{border-color:#FF4D4F;background:#fff2f0;color:#FF4D4F}

/* 听写 */
.dictation-area{margin-top:24px;width:100%;max-width:560px}
.dictation-input{width:100%;padding:18px;font-size:26px;text-align:center;border:2px solid #e8e8e8;border-radius:12px;outline:none;letter-spacing:4px;font-weight:500}
.dictation-input:focus{border-color:#667eea;box-shadow:0 0 0 3px rgba(102,126,234,.1)}
.dictation-input.correct{border-color:#52C41A;background:#f6ffed}
.dictation-input.wrong{border-color:#FF4D4F;background:#fff2f0}
.letter-buttons{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin:24px auto 0;max-width:520px}
.letter-btn{width:48px;height:48px;border:1px solid #e8e8e8;border-radius:10px;background:#fff;font-size:18px;cursor:pointer;transition:all .15s;font-weight:500}
.letter-btn:hover{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border-color:transparent;transform:translateY(-2px)}
.letter-btn:disabled{opacity:.3;cursor:not-allowed;transform:none}

/* 口算 */
.math-question{font-size:60px;font-weight:700;color:#333;margin:36px 0;letter-spacing:4px}
.math-options{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;max-width:420px;width:100%}
.math-option{padding:28px;border:2px solid #e8e8e8;border-radius:14px;background:#fff;font-size:30px;font-weight:600;cursor:pointer;transition:all .2s;text-align:center}
.math-option:hover{border-color:#667eea;background:#f8f9ff;transform:translateY(-2px)}
.math-option.correct{border-color:#52C41A;background:#f6ffed;color:#52C41A}
.math-option.wrong{border-color:#FF4D4F;background:#fff2f0;color:#FF4D4F}

/* 古诗 */
.poem-title{font-size:30px;font-weight:700;margin-bottom:10px;color:#333}
.poem-author{font-size:15px;color:#999;margin-bottom:28px}
.poem-content{font-size:20px;line-height:2.4;color:#444;text-align:center;max-width:600px;white-space:pre-line}
.poem-translation{margin-top:28px;padding:22px;background:linear-gradient(135deg,#f0f7ff,#f8f9ff);border-radius:12px;font-size:14px;color:#666;max-width:600px;line-height:1.8}

/* 完成页 */
.complete-area{text-align:center}
.complete-icon{font-size:80px;margin-bottom:24px}
.complete-title{font-size:28px;font-weight:700;margin-bottom:12px;color:#333}
.complete-stats{display:flex;gap:40px;justify-content:center;margin:28px 0}
.complete-stat{text-align:center}
.complete-stat-num{font-size:40px;font-weight:700;background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.complete-stat-label{font-size:13px;color:#999;margin-top:6px}

/* 个人中心 */
.profile-card{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);border-radius:16px;padding:36px;color:#fff;margin-bottom:24px;display:flex;align-items:center;gap:28px}
.profile-avatar{width:84px;height:84px;border-radius:50%;background:rgba(255,255,255,.2);display:flex;align-items:center;justify-content:center;font-size:40px}
.profile-info h3{font-size:24px;margin-bottom:8px}
.profile-info p{opacity:.85;font-size:14px;margin-bottom:4px}
.profile-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-bottom:24px}
.profile-item{background:#fff;border-radius:14px;padding:24px;box-shadow:0 2px 12px rgba(0,0,0,.06)}
.profile-item-label{font-size:13px;color:#999;margin-bottom:8px}
.profile-item-value{font-size:22px;font-weight:600;color:#333}

/* Toast */
.toast{position:fixed;top:80px;left:50%;transform:translateX(-50%);background:rgba(0,0,0,.8);color:#fff;padding:14px 28px;border-radius:10px;font-size:14px;z-index:9999;opacity:0;transition:opacity .3s;pointer-events:none}
.toast.show{opacity:1}
.toast.success{background:#52C41A}
.toast.error{background:#FF4D4F}

/* 空状态 */
.empty-state{text-align:center;padding:60px 20px;color:#999}
.empty-icon{font-size:64px;margin-bottom:16px}
.empty-text{font-size:16px;margin-bottom:20px}

/* 顶部金币 */
.header-coin{background:linear-gradient(135deg,#FFF7E6,#FFFBE6);color:#FA8C16;padding:6px 16px;border-radius:20px;font-size:14px;font-weight:600;display:flex;align-items:center;gap:4px}

/* 首页大按钮 */
.home-container{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:calc(100vh - 64px);padding:40px 32px}
.home-title{font-size:36px;font-weight:700;color:#333;margin-bottom:12px;text-align:center}
.home-subtitle{font-size:16px;color:#999;margin-bottom:48px;text-align:center}
.home-buttons{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;width:100%;max-width:960px}
.home-btn{background:#fff;border-radius:24px;padding:48px 32px;box-shadow:0 4px 20px rgba(0,0,0,.08);cursor:pointer;transition:all .3s;border:3px solid transparent;text-align:center;position:relative;overflow:hidden}
.home-btn:hover{transform:translateY(-8px);box-shadow:0 12px 40px rgba(0,0,0,.15)}
.home-btn::before{content:"";position:absolute;top:0;left:0;right:0;height:5px;transform:scaleX(0);transition:transform .3s}
.home-btn:hover::before{transform:scaleX(1)}
.home-btn.chinese{border-color:#FFD666}
.home-btn.chinese:hover{border-color:#FAAD14}
.home-btn.chinese::before{background:linear-gradient(90deg,#FAAD14,#FFC53D)}
.home-btn.math{border-color:#95DE64}
.home-btn.math:hover{border-color:#52C41A}
.home-btn.math::before{background:linear-gradient(90deg,#52C41A,#73D13D)}
.home-btn.english{border-color:#69C0FF}
.home-btn.english:hover{border-color:#1890FF}
.home-btn.english::before{background:linear-gradient(90deg,#1890FF,#40A9FF)}
.home-btn-icon{font-size:72px;margin-bottom:20px}
.home-btn-name{font-size:28px;font-weight:700;color:#333;margin-bottom:12px}
.home-btn-desc{font-size:14px;color:#999;line-height:1.6}

/* 交互模式切换栏 */
.interaction-tabs{display:flex;gap:10px;margin-bottom:24px;flex-wrap:wrap;justify-content:center}
.interaction-tab{padding:10px 24px;border-radius:10px;background:#f5f5f5;border:1px solid #e8e8e8;cursor:pointer;font-size:14px;font-weight:500;transition:all .2s;color:#666}
.interaction-tab.active{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border-color:transparent;box-shadow:0 4px 12px rgba(102,126,234,.3)}
.interaction-tab:hover:not(.active){border-color:#667eea;color:#667eea}

/* 日常英语字符槽 */
.daily-char-slots{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;margin-top:8px;max-width:750px;width:100%}
.daily-char-input{width:34px;height:42px;padding:0;text-align:center;border:2px solid #e8e8e8;border-radius:8px;font-size:17px;font-weight:600;outline:none;letter-spacing:0;background:#fff}
.daily-char-input.is-space{width:20px;background:transparent;border-style:dashed;border-color:#ddd}
.daily-char-input:focus{border-color:#667eea}
.daily-char-input.correct{border-color:#52C41A;background:#f6ffed}
.daily-char-input.wrong{border-color:#FF4D4F;background:#fff2f0}

/* 响应式 */
@media(max-width:768px){
.container{padding:16px}
.module-grid{grid-template-columns:1fr}
.stat-row{grid-template-columns:repeat(2,1fr)}
.word-main{font-size:36px}
.math-question{font-size:40px}
.header{padding:0 16px}
.login-box{width:90%;padding:32px 24px}
.home-buttons{grid-template-columns:1fr;gap:20px;max-width:400px}
.home-btn{padding:32px 24px}
.home-btn-icon{font-size:56px}
.home-btn-name{font-size:24px}
.home-title{font-size:28px}
.daily-char-input{width:28px;height:36px;font-size:14px}
}

/* ===== 语文学习增强样式 ===== */
.chinese-audio-btn{
  display:inline-flex !important;
  align-items:center;
  justify-content:center;
  white-space:nowrap;
  min-width:140px;
  height:48px;
  padding:0 20px;
  font-size:16px;
}

.chinese-letter-btn{
  min-width:52px;
  height:52px;
  font-size:24px;
  font-weight:600;
}

/* 选择题选项 */
.choice-options{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:14px;
  max-width:480px;
  margin:0 auto;
  width:100%;
}

.choice-option-btn{
  padding:18px 16px;
  font-size:22px;
  font-weight:600;
  border:2px solid #e8e8e8;
  border-radius:12px;
  background:#fff;
  cursor:pointer;
  transition:all 0.2s;
  color:#333;
  min-height:64px;
  display:flex;
  align-items:center;
  justify-content:center;
}

.choice-option-btn:hover:not(:disabled){
  border-color:#667eea;
  background:#f5f7ff;
  transform:translateY(-2px);
  box-shadow:0 4px 12px rgba(102,126,234,0.15);
}

.choice-option-btn:disabled{
  cursor:default;
}

.choice-option-btn.correct{
  border-color:#52C41A !important;
  background:#f6ffed !important;
  color:#52C41A !important;
}

.choice-option-btn.wrong{
  border-color:#FF4D4F !important;
  background:#fff2f0 !important;
  color:#FF4D4F !important;
}

/* 听写输入框 */
.dictation-input.correct{
  border-color:#52C41A !important;
  background:#f6ffed !important;
}

.dictation-input.wrong{
  border-color:#FF4D4F !important;
  background:#fff2f0 !important;
}

/* 响应式 */
@media (max-width:600px){
  .choice-options{
    grid-template-columns:1fr;
    max-width:320px;
  }
  .choice-option-btn{
    font-size:20px;
    min-height:56px;
  }
  .chinese-letter-btn{
    min-width:44px;
    height:44px;
    font-size:20px;
  }
}