/* ===================================================================
   AI 助学 v5 — Premium Modular Redesign
   Design: Warm amber + sage green, card-grid dashboard, glass dock
   v5 只覆盖 UI 层，不动登录页（login-overlay 由 style.css 负责）
   =================================================================== */

/* ---- Override root tokens for premium palette ---- */
:root {
  --color-primary:       #0F766E;
  --color-primary-light: #CCFBF1;
  --color-primary-dark:  #115E59;
  --color-primary-hover: #115E59;

  --bg-page:    #F8F6F3;
  --bg-card:    #FFFFFF;
  --bg-input:   #F5F3F0;
  --color-bg:   #F8F6F3;
  --color-white:#FFFFFF;

  --text-primary:   #1C1917;
  --text-secondary: #57534E;
  --text-tertiary:  #A8A29E;
  --text-inverse:   #FFFFFF;
  --color-text:          #1C1917;
  --color-text-secondary:#57534E;
  --color-text-muted:    #A8A29E;

  --border-light: #E7E5E4;
  --border-card:  #F0EEEC;
  --color-border: #E7E5E4;

  --color-success: #059669;
  --color-warning: #D97706;
  --color-danger:  #DC2626;
  --color-info:    #0D9488;

  --radius-sm:   10px;
  --radius-md:   14px;
  --radius-lg:   18px;
  --radius-xl:   24px;
  --radius-full: 999px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,.06);
  --shadow-lg: 0 8px 32px rgba(0,0,0,.08);

  --space-xs: 4px; --space-sm: 8px; --space-md: 12px;
  --space-lg: 16px; --space-xl: 20px; --space-2xl: 24px;

  --font-sans: 'DM Sans','Nunito','PingFang SC','Hiragino Sans GB',sans-serif;
  --font-mono: 'SF Mono','Menlo','Consolas',monospace;
  --font-family: var(--font-sans);
  --font-display: 'Nunito','PingFang SC','Hiragino Sans GB',sans-serif;

  --touch-min: 44px;
  --ease-out: cubic-bezier(.25,.46,.45,.94);
  --duration-fast: .15s;
  --duration-normal: .25s;

  --bg-muted: #F0EEEC;
  --border-medium: #5EEAD4;
  --touch: 44px;

  /* theme 别名（兼容 body.mode-*） */
  --theme-primary:       var(--color-primary);
  --theme-primary-light: var(--color-primary-light);
  --theme-primary-dark:  var(--color-primary-dark);
  --theme-gradient:      linear-gradient(135deg,#0F766E,#0D9488);
  --theme-shadow:        0 4px 16px rgba(15,118,110,.2);
}

body.mode-preview {
  --color-primary:#D97706;--color-primary-light:#FEF3C7;--color-primary-dark:#B45309;
  --color-primary-hover:#B45309;--color-info:#D97706;
  --theme-primary:#D97706;--theme-primary-light:#FEF3C7;--theme-primary-dark:#B45309;
  --theme-gradient:linear-gradient(135deg,#D97706,#F59E0B);
  --theme-shadow:0 4px 16px rgba(217,119,6,.2);
}
body.mode-review {
  --color-primary:#7C3AED;--color-primary-light:#EDE9FE;--color-primary-dark:#6D28D9;
  --color-primary-hover:#6D28D9;--color-info:#7C3AED;
  --theme-primary:#7C3AED;--theme-primary-light:#EDE9FE;--theme-primary-dark:#6D28D9;
  --theme-gradient:linear-gradient(135deg,#7C3AED,#A78BFA);
  --theme-shadow:0 4px 16px rgba(124,58,237,.2);
}

/* ---- Reset ---- */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{-webkit-text-size-adjust:100%;font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;-webkit-tap-highlight-color:transparent}
body{
  margin:0;padding:0;font-family:var(--font-family);font-size:16px;line-height:1.6;
  color:var(--text-primary);background:var(--bg-page);
  height:100dvh;display:flex;flex-direction:column;overflow:hidden;
  max-width:480px;margin:0 auto;position:relative;font-weight:500;
}

/* ===================================================================
   HEADER — warm, subtle
   =================================================================== */
.app-header{
  flex-shrink:0;display:flex;align-items:center;justify-content:space-between;
  padding:10px 16px;background:var(--bg-card);min-height:48px;
  border-bottom:1px solid var(--border-light);
}
.app-header-left{
  display:flex;align-items:center;gap:6px;border:none;background:none;
  cursor:pointer;font-family:var(--font-family);padding:4px 8px;
  border-radius:var(--radius-sm);transition:background .15s;min-width:0;flex:1;text-align:left;
}
.app-header-left:active{background:var(--bg-muted)}
.header-list-icon{font-size:1.1rem;flex-shrink:0}
.header-title-group{display:flex;flex-direction:column;min-width:0}
.app-title{font-family:var(--font-display);font-weight:800;font-size:15px;color:var(--color-text);line-height:1.2;letter-spacing:-.01em}
.conv-title{font-size:11px;color:var(--color-primary);font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:120px}
.app-header-actions{display:flex;gap:6px;flex-shrink:0}
.header-action-btn{
  display:inline-flex;align-items:center;gap:3px;background:var(--bg-input);
  border:1px solid var(--border-light);color:var(--text-secondary);
  padding:5px 12px;border-radius:var(--radius-full);font-size:12px;font-weight:600;
  cursor:pointer;font-family:var(--font-family);transition:all .15s var(--ease-out);
}
.header-action-btn:active{background:var(--color-primary-light);color:var(--color-primary);border-color:var(--color-primary)}

/* ===================================================================
   TAB PAGES
   =================================================================== */
.tab-page{flex:1;display:flex;flex-direction:column;overflow:hidden;min-height:0}
.page-scroll{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch}

/* ===================================================================
   HOME — Clean, polished app-style
   =================================================================== */
.home-scroll{
  display:flex;flex-direction:column;align-items:center;gap:0;
  padding:0 16px 32px;background:var(--bg-page);
}

/* Hero: avatar centered + greeting */
.home-hero{
  display:flex;flex-direction:column;align-items:center;
  padding:36px 0 28px;animation:heroIn .5s cubic-bezier(.16,1,.3,1);
}
@keyframes heroIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
.home-avatar{
  width:80px;height:80px;border-radius:50%;object-fit:cover;
  background:var(--color-primary-light);
  box-shadow:0 2px 12px rgba(0,0,0,.06);
  margin-bottom:16px;animation:float 3s ease-in-out infinite;
}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-5px)}}
.home-greeting{
  font-size:17px;font-weight:600;color:var(--color-text);
  text-align:center;line-height:1.6;max-width:280px;
}

/* Stats row — clean, no card wrapper */
.stats-row{
  display:flex;justify-content:center;gap:0;
  width:100%;max-width:340px;margin-bottom:20px;
}
.stat-item{
  flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;
  padding:12px 0;
}
.stat-val{
  font-family:var(--font-display);font-size:24px;font-weight:800;
  color:var(--color-text);line-height:1;
}
.stat-lbl{font-size:12px;color:var(--text-tertiary);font-weight:500}

/* CTA card — subtle gradient, clean */
.cta-card{
  display:flex;align-items:center;gap:12px;
  width:100%;padding:16px 18px;border:none;border-radius:var(--radius-lg);
  background:linear-gradient(135deg,#0D9488,#0F766E);
  color:#fff;cursor:pointer;text-align:left;
  font-family:var(--font-family);
  box-shadow:0 2px 12px rgba(13,148,136,.18);
  transition:transform .15s cubic-bezier(.16,1,.3,1),box-shadow .15s;
  margin-bottom:20px;
}
.cta-card:active{transform:scale(.98);box-shadow:0 1px 6px rgba(13,148,136,.12)}
.cta-left{font-size:32px;line-height:1;flex-shrink:0}
.cta-body{flex:1;display:flex;flex-direction:column;gap:2px}
.cta-title{font-family:var(--font-display);font-weight:800;font-size:18px;letter-spacing:-.01em}
.cta-sub{font-size:13px;opacity:.82;font-weight:500}
.cta-arrow{font-size:20px;opacity:.6;flex-shrink:0}

/* Mode row — 3 equal cards */
.mode-row{
  display:grid;grid-template-columns:repeat(3,1fr);gap:10px;
  width:100%;margin-bottom:20px;
}
.mode-card{
  display:flex;flex-direction:column;align-items:center;gap:8px;
  padding:18px 8px;border-radius:var(--radius-md);
  background:var(--bg-card);border:1px solid var(--border-light);
  cursor:pointer;font-family:var(--font-family);
  transition:border-color .15s,background .15s;
  -webkit-tap-highlight-color:transparent;
}
.mode-card:active{border-color:var(--color-primary);background:var(--color-primary-light)}
.mc-icon{font-size:28px;line-height:1}
.mc-name{font-size:13px;font-weight:600;color:var(--color-text)}

/* Function grid — 2×2 */
.func-grid{
  display:grid;grid-template-columns:repeat(2,1fr);gap:10px;
  width:100%;
}
.func-card{
  display:flex;align-items:center;gap:10px;
  padding:16px 14px;border-radius:var(--radius-md);
  background:var(--bg-card);border:1px solid var(--border-light);
  cursor:pointer;font-family:var(--font-family);
  transition:border-color .15s,background .15s;
  -webkit-tap-highlight-color:transparent;
}
.func-card:active{border-color:var(--color-primary);background:var(--color-primary-light)}
.fc-icon{font-size:24px;flex-shrink:0}
.fc-label{font-size:14px;font-weight:600;color:var(--color-text)}

/* ===================================================================
   CHAT PAGE
   =================================================================== */
#tab-chat{display:flex;flex-direction:column}
.chat-scroll{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;background:var(--bg-page)}

/* Mode tabs */
.mode-tabs{
  flex-shrink:0;display:flex;gap:6px;
  padding:10px 16px;background:var(--bg-card);
  border-bottom:1px solid var(--border-light);
}
.mode-tab{
  flex:1;padding:9px 0;border-radius:var(--radius-full);border:none;
  background:transparent;font-size:13px;font-weight:600;cursor:pointer;
  font-family:var(--font-family);color:var(--text-tertiary);
  transition:all .15s var(--ease-out);
}
.mode-tab.active{background:var(--color-primary-light);color:var(--color-primary)}

/* Difficulty */
.difficulty-bar{
  flex-shrink:0;display:flex;align-items:center;gap:8px;
  padding:6px 16px;background:var(--bg-card);
  font-size:12px;color:var(--text-secondary);font-weight:600;
  border-bottom:1px solid var(--border-light);
}
.diff-btn{
  padding:5px 14px;border-radius:var(--radius-full);
  border:1px solid var(--border-light);background:var(--bg-card);
  font-size:12px;font-weight:600;cursor:pointer;
  font-family:var(--font-family);color:var(--text-secondary);
  transition:all .15s var(--ease-out);
}
.diff-btn.active{background:var(--color-primary);color:var(--color-white);border-color:var(--color-primary)}

/* Messages */
.chat-messages{display:flex;flex-direction:column;gap:2px;padding:8px 0 16px 0}
.chat-empty{
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:80px 24px;text-align:center;opacity:.45;
}
.chat-empty-icon{font-size:52px;margin-bottom:16px;animation:float 3s ease-in-out infinite}
.chat-empty-text{font-size:14px;color:var(--text-secondary)}
.answer-content.ai-answer{display:none}

/* Chat welcome */
.chat-welcome{
  margin:16px;padding:24px 16px 20px;background:var(--bg-card);
  border-radius:var(--radius-xl);box-shadow:var(--shadow-sm);
  text-align:center;display:flex;flex-direction:column;align-items:center;gap:12px;
  border:1px solid var(--border-light);
}
.chat-welcome.hidden{display:none}
.welcome-icon{animation:float 3s ease-in-out infinite}
.welcome-avatar-img{width:88px;height:88px;border-radius:50%;object-fit:cover}
.welcome-text{font-family:var(--font-display);font-size:16px;font-weight:700;color:var(--color-text);line-height:1.7;letter-spacing:.02em;max-width:280px}
.welcome-cards{display:flex;gap:10px;width:100%;margin-top:4px}
.welcome-card{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:6px;padding:14px 8px;border-radius:14px;cursor:pointer;
  transition:all .2s ease;-webkit-tap-highlight-color:transparent;
  -webkit-user-select:none;user-select:none;-webkit-touch-callout:none;touch-action:manipulation;
}
.welcome-card:active{transform:scale(.95)}
.welcome-card *{pointer-events:none}
.welcome-card-icon{font-size:28px;line-height:1}
.welcome-card-title{font-size:13px;font-weight:600;white-space:nowrap}
.welcome-card-blue{background:#EFF3FF;color:#4F8AF7}
.welcome-card-orange{background:#FFF7ED;color:#F97316}
.welcome-card-green{background:#ECFDF5;color:#10B981}

/* Bubbles */
.chat-bubble{overflow-wrap:break-word;word-break:normal;animation:bubbleIn .3s cubic-bezier(.16,1,.3,1)}
@keyframes bubbleIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
.chat-time{display:block;font-size:11px;color:var(--text-tertiary);margin-top:4px;padding:0 4px}
.chat-bubble-user .chat-time{text-align:right;color:rgba(255,255,255,.7)}

.chat-bubble-user{
  align-self:flex-end;max-width:82%;background:var(--theme-gradient);
  color:#fff;padding:14px 18px;border-radius:20px 20px 4px 20px;
  box-shadow:var(--theme-shadow);font-size:15px;line-height:1.6;margin:4px 16px;
}
.chat-bubble-ai{
  align-self:flex-start;max-width:85%;background:var(--bg-card);
  color:var(--text-primary);padding:16px 18px;border-radius:20px 20px 20px 4px;
  box-shadow:0 2px 10px rgba(0,0,0,.04);font-size:15px;line-height:1.7;
  margin:4px 16px 4px 52px;position:relative;border:1px solid var(--border-light);
}
.chat-bubble-ai::before{
  content:'🧑‍🏫';position:absolute;left:-42px;top:4px;
  width:30px;height:30px;background:var(--theme-primary-light);
  border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:14px;
}
.chat-bubble-label{font-size:12px;color:var(--text-tertiary);margin-bottom:6px;display:flex;align-items:center}

/* Step headers & errors */
.chat-bubble-content .step-header{
  font-family:var(--font-display);font-weight:700;color:var(--color-primary);cursor:pointer;
  min-height:var(--touch-min);padding:6px 4px;
  border-bottom:1px dashed var(--border-light);margin-top:6px;
}
.chat-bubble-content .step-header .step-arrow{display:inline-block;margin-right:6px;font-size:10px;transition:transform .2s}
.chat-bubble-content .step-header:active{background:var(--color-primary-light);border-radius:var(--radius-sm)}
.chat-bubble-content .step-body{padding:4px 0 4px 12px;display:none}
.chat-bubble-content .step-body.expanded{display:block}
.chat-bubble-content .error-message{
  background:#FEF2F2;border:1px solid #FECACA;border-radius:var(--radius-sm);
  padding:12px;font-size:14px;color:#991B1B;line-height:1.6;
}

/* Loading */
#loading{margin:12px 0}
.loading{display:flex;flex-direction:column;align-items:center;gap:8px;padding:20px 0;color:var(--text-secondary);font-size:14px}
.loading-spinner{
  width:28px;height:28px;border:3px solid var(--border-light);
  border-top-color:var(--color-primary);border-radius:50%;animation:spin .8s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg)}}

/* ===================================================================
   CHAT INPUT — Glass
   =================================================================== */
.chat-input-bar{
  flex-shrink:0;padding:6px 10px 8px;
  padding-bottom:calc(8px + env(safe-area-inset-bottom,0));
  background:rgba(255,255,255,.82);backdrop-filter:blur(24px) saturate(180%);
  -webkit-backdrop-filter:blur(24px) saturate(180%);
  margin:0 10px 10px 10px;border-radius:var(--radius-xl);
  border:1px solid rgba(255,255,255,.6);
  box-shadow:0 -2px 24px rgba(0,0,0,.05),inset 0 1px 0 rgba(255,255,255,.7);
}
.ocr-loading{text-align:center;font-size:12px;color:var(--color-primary);padding:4px 0;animation:pulse 1.5s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.5}}
.input-row{display:flex;align-items:center;gap:6px}
.btn-camera{
  width:38px;height:38px;border-radius:50%;border:none;background:transparent;
  font-size:18px;cursor:pointer;flex-shrink:0;display:flex;align-items:center;justify-content:center;
  transition:all .15s var(--ease-out);color:var(--text-secondary);
}
.btn-camera:active{transform:scale(.9);background:var(--color-primary-light);color:var(--color-primary)}
.btn-pick-teacher{
  width:auto;height:38px;border-radius:var(--radius-full);border:1px solid var(--border-light);
  background:var(--bg-input);font-size:10px;font-weight:600;cursor:pointer;
  font-family:var(--font-family);color:var(--text-secondary);transition:all .15s var(--ease-out);
  line-height:1.2;white-space:nowrap;flex-shrink:0;padding:0 8px;
}
.btn-pick-teacher:active{background:var(--color-primary-light);color:var(--color-primary)}
.input-msg{
  flex:1;padding:11px 16px;border:none;border-radius:var(--radius-full);
  font-size:15px;outline:none;background:var(--bg-input);color:var(--text-primary);
  font-family:var(--font-family);font-weight:500;
  transition:all .2s var(--ease-out);
}
.input-msg:focus{background:var(--bg-card);box-shadow:0 0 0 3px var(--color-primary-light)}
.input-msg::placeholder{color:var(--text-tertiary)}
.btn-send{
  width:42px;height:42px;border-radius:50%;background:var(--theme-primary);color:#fff;
  border:none;font-size:18px;cursor:pointer;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  box-shadow:var(--theme-shadow);transition:transform .15s var(--ease-out),box-shadow .15s var(--ease-out);
}
.btn-send:active{transform:scale(.85);box-shadow:0 2px 6px rgba(15,118,110,.15)}
.btn-send:disabled{background:var(--bg-muted);box-shadow:none;cursor:not-allowed}
.input-actions{display:flex;gap:8px;margin-top:8px;flex-wrap:wrap}
.btn-action{
  padding:8px 14px;border-radius:var(--radius-full);border:1px solid var(--border-light);
  background:var(--bg-card);font-size:12px;color:var(--text-secondary);
  cursor:pointer;font-family:var(--font-family);transition:all .15s var(--ease-out);white-space:nowrap;
}
.btn-action:active{background:var(--color-primary-light);border-color:var(--color-primary);color:var(--color-primary);transform:scale(.96)}
.btn-action:disabled{opacity:.4;cursor:not-allowed}
.confidence-badge{
  display:inline-flex;align-items:center;padding:2px 8px;border-radius:20px;
  font-size:12px;font-weight:700;margin-left:auto;
}
.confidence-badge.high{background:#D1FAE5;color:#065F46}
.confidence-badge.medium{background:#FEF3C7;color:#92400E}
.confidence-badge.low{background:#FEE2E2;color:#991B1B}
.btn-fb-correct{border-color:#A7F3D0;color:#065F46;background:#ECFDF5}
.btn-fb-correct.active{background:#A7F3D0}
.btn-fb-wrong{border-color:#FECACA;color:#991B1B;background:#FEF2F2}
.btn-fb-wrong.active{background:#FECACA}

/* ===================================================================
   BOTTOM TAB BAR — Glass Pill
   =================================================================== */
.tab-bar{
  flex-shrink:0;height:56px;margin:0 16px 12px;
  margin-bottom:calc(12px + env(safe-area-inset-bottom,0));
  background:rgba(255,255,255,.82);backdrop-filter:blur(24px) saturate(200%);
  -webkit-backdrop-filter:blur(24px) saturate(200%);
  border-radius:var(--radius-xl);
  box-shadow:0 2px 24px rgba(0,0,0,.05),0 0 0 1px rgba(0,0,0,.02),inset 0 1px 0 rgba(255,255,255,.7);
  display:flex;align-items:center;justify-content:space-around;padding:4px;
}
.tab-item{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:1px;height:100%;border:none;background:none;cursor:pointer;
  color:var(--text-tertiary);transition:all .2s cubic-bezier(.34,1.56,.64,1);
  font-family:var(--font-family);-webkit-tap-highlight-color:transparent;
  border-radius:28px;padding:4px 0;
}
.tab-item.active{color:var(--theme-primary)}
.tab-icon{font-size:1.2rem;transition:transform .15s var(--ease-out)}
.tab-item.active .tab-icon{transform:translateY(-2px)}
.tab-label{font-size:10px;font-weight:700;letter-spacing:.03em;text-transform:uppercase}

/* ===================================================================
   REVIEW PAGE
   =================================================================== */
.review-entry-card{
  text-align:center;padding:32px 20px;background:var(--bg-card);
  border-radius:var(--radius-lg);border:1px solid var(--border-light);
  margin:16px;
}
.review-entry-icon{font-size:3rem;margin-bottom:10px}
.review-entry-title{font-family:var(--font-display);font-size:22px;font-weight:800;margin-bottom:6px}
.review-entry-desc{font-size:14px;color:var(--text-secondary);margin-bottom:16px}
.page-title{font-family:var(--font-display);font-size:20px;font-weight:800;color:var(--color-text);padding:20px 16px 12px;margin:0}
.review-summary{
  background:var(--color-primary-light);border-radius:var(--radius-md);
  padding:14px;font-size:15px;line-height:1.8;white-space:pre-wrap;overflow-wrap:break-word;word-break:normal;
}
.review-intro{font-size:14px;color:var(--text-secondary);text-align:center;margin-bottom:20px;line-height:1.6}
.review-last-title{font-size:15px;font-weight:700;color:var(--color-text)}

/* ===================================================================
   BUTTONS
   =================================================================== */
.btn{display:block;padding:14px;border:none;border-radius:var(--radius-md);font-size:15px;font-weight:600;font-family:var(--font-family);cursor:pointer;transition:all .15s var(--ease-out)}
.btn:active{transform:scale(.97)}
.btn-primary{background:var(--color-primary);color:#fff}
.btn-primary:active{background:var(--color-primary-dark)}
.btn-outline{border:1.5px solid var(--color-primary);background:transparent;color:var(--color-primary);border-radius:var(--radius-md)}
.btn-outline:active{background:var(--color-primary-light)}
.btn-full{width:100%}
.btn:disabled{opacity:.4;cursor:not-allowed;pointer-events:none}

/* ===================================================================
   TEACHERS PAGE
   =================================================================== */
.teacher-list{display:flex;flex-direction:column;gap:8px;padding:0 16px}
.teacher-item{
  display:flex;align-items:center;gap:14px;padding:15px;
  background:var(--bg-card);border-radius:var(--radius-lg);
  box-shadow:var(--shadow-sm);cursor:pointer;transition:all .15s var(--ease-out);
  border:2px solid transparent;
}
.teacher-item:active{transform:scale(.98);background:var(--color-primary-light);border-color:var(--color-primary)}
.teacher-item.active{border-color:var(--color-primary);background:rgba(15,118,110,.04)}
.teacher-avatar{
  width:48px;height:48px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  font-size:20px;flex-shrink:0;overflow:hidden;
}
.avatar-text{color:#fff;font-size:20px;font-weight:700}
.avatar-img-wrap{overflow:hidden;position:relative}
.avatar-photo{width:48px;height:48px;border-radius:50%;object-fit:cover}
.teacher-info{flex:1;min-width:0}
.teacher-name{font-family:var(--font-display);font-size:16px;font-weight:800;color:var(--color-text);margin-bottom:2px}
.teacher-subject{font-size:13px;color:var(--text-secondary)}
.teacher-style-tag{
  display:inline-block;padding:2px 8px;border-radius:var(--radius-full);
  font-size:11px;background:var(--bg-muted);color:var(--text-secondary);margin-right:4px;margin-top:4px;
}
.teacher-desc{font-size:13px;color:var(--text-secondary);margin-top:2px}
.teacher-series{font-size:12px;color:var(--text-tertiary);margin-top:2px}
.teacher-check{color:var(--color-primary);font-size:20px;flex-shrink:0}
.teacher-custom-badge{font-size:10px;padding:2px 8px;border-radius:var(--radius-full);background:linear-gradient(135deg,var(--color-primary),#2DD4BF);color:#fff;font-weight:700}
.teacher-del-btn{border:none;background:none;font-size:16px;cursor:pointer;padding:4px;opacity:.4}
.teacher-del-btn:hover{opacity:1;color:var(--color-danger)}
.teacher-group{margin-bottom:4px}
.teacher-group-title{font-size:13px;font-weight:700;color:var(--text-tertiary);padding:10px 4px 6px 4px}
.teacher-coming-soon{text-align:center;font-size:13px;color:var(--text-tertiary);margin-top:16px;padding-top:12px;border-top:1px dashed var(--border-light)}
#create-teacher-btn{
  margin:12px 16px;padding:14px;border-radius:var(--radius-lg);
  border:2px dashed var(--border-light);background:var(--bg-card);
  font-size:15px;color:var(--text-secondary);cursor:pointer;font-family:var(--font-family);transition:all .15s var(--ease-out);
}
#create-teacher-btn:active{background:var(--color-primary-light);border-color:var(--color-primary);color:var(--color-primary)}
.settings-gear{text-align:center;padding:20px 16px}
.settings-gear button{background:none;border:none;color:var(--text-tertiary);font-size:14px;cursor:pointer;font-family:var(--font-family)}

/* ===================================================================
   MINE PAGE
   =================================================================== */
.mine-card{
  display:flex;align-items:center;gap:14px;
  padding:18px 20px;background:var(--bg-card);
  border-radius:var(--radius-lg);cursor:pointer;
  border:1px solid var(--border-light);margin:6px 16px;
  transition:all .15s var(--ease-out);
}
.mine-card:active{background:var(--color-primary-light);border-color:var(--color-primary)}
.mine-card-icon{font-size:28px;width:44px;height:44px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;background:var(--bg-muted);flex-shrink:0}
.mine-card-title{display:block;font-family:var(--font-display);font-size:16px;font-weight:800;color:var(--color-text);margin-bottom:2px}
.mine-card-desc{display:block;font-size:13px;color:var(--text-secondary)}

/* Schedule settings */
.settings-section{
  margin:16px;padding:20px 18px;background:var(--bg-card);
  border-radius:var(--radius-lg);border:1px solid var(--border-light);
}
.settings-section-title{font-family:var(--font-display);font-size:16px;font-weight:800;color:var(--color-text);margin-bottom:4px}
.settings-hint{font-size:13px;color:var(--text-secondary);margin-bottom:16px;line-height:1.5}
.settings-field{margin-bottom:16px}
.settings-field label{display:block;font-family:var(--font-display);font-size:13px;font-weight:800;color:var(--color-text);margin-bottom:8px}
.settings-field select{
  width:100%;padding:11px 14px;border:1.5px solid var(--border-light);border-radius:var(--radius-md);
  font-size:14px;color:var(--color-text);background:var(--bg-input);font-family:var(--font-family);font-weight:500;
  appearance:none;-webkit-appearance:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M6 8L1 3h10z' fill='%23A8A29E'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 14px center;
}
.settings-field select:focus{outline:none;border-color:var(--color-primary)}
.btn-settings-save{
  padding:11px 24px;background:var(--color-primary);color:#fff;
  border:none;border-radius:var(--radius-md);font-size:14px;font-weight:700;cursor:pointer;
  font-family:var(--font-family);transition:all .15s var(--ease-out);
}
.btn-settings-save:active{background:var(--color-primary-dark);transform:scale(.97)}
.settings-save-status{font-size:12px;color:var(--text-tertiary);margin-left:8px}

/* Feedback */
.feedback-section{
  margin:16px;padding:20px 18px;background:var(--bg-card);
  border-radius:var(--radius-lg);border:1px solid var(--border-light);
}
.feedback-title{font-family:var(--font-display);font-size:16px;font-weight:800;color:var(--color-text);margin-bottom:12px}
.feedback-textarea{
  width:100%;min-height:60px;padding:12px 14px;border:1.5px solid var(--border-light);
  border-radius:var(--radius-md);font-size:14px;font-family:var(--font-family);font-weight:500;
  resize:vertical;background:var(--bg-input);color:var(--color-text);line-height:1.5;
  margin-bottom:8px;transition:border .15s var(--ease-out);
}
.feedback-textarea:focus{outline:none;border-color:var(--color-primary)}
.feedback-contact{
  width:100%;padding:11px 14px;border:1.5px solid var(--border-light);
  border-radius:var(--radius-md);font-size:14px;font-family:var(--font-family);font-weight:500;
  background:var(--bg-input);color:var(--color-text);margin-bottom:12px;
  transition:border .15s var(--ease-out);
}
.feedback-contact:focus{outline:none;border-color:var(--color-primary)}
.btn-feedback{
  padding:11px 24px;background:var(--color-primary);color:#fff;
  border:none;border-radius:var(--radius-md);font-size:14px;font-weight:700;cursor:pointer;
  font-family:var(--font-family);transition:all .15s var(--ease-out);
}
.btn-feedback:active{background:var(--color-primary-dark);transform:scale(.97)}
.feedback-status{font-size:12px;color:var(--text-tertiary);margin-left:8px}

/* ===================================================================
   STATS PAGE
   =================================================================== */
.stats-summary{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;padding:0 16px;margin-bottom:16px}
.stat-card{
  background:var(--bg-card);border-radius:var(--radius-lg);padding:16px 10px;
  text-align:center;border:1px solid var(--border-light);
}
.stat-card .stat-num{font-family:var(--font-display);font-size:26px;font-weight:800;color:var(--color-text);line-height:1;display:block;letter-spacing:-.02em}
.stat-card .stat-label{font-size:11px;color:var(--text-tertiary);margin-top:6px;display:block;font-weight:600}
.stats-empty{text-align:center;padding:60px 24px}
.stats-empty-icon{font-size:48px;margin-bottom:12px;opacity:.4}
.stats-empty-text{font-size:15px;color:var(--text-secondary);margin-bottom:4px}
.stats-empty-hint{font-size:13px;color:var(--text-tertiary)}
.stats-section-title{font-family:var(--font-display);font-size:16px;font-weight:800;color:var(--color-text);padding:0 16px;margin-bottom:12px}
.stats-records{display:flex;flex-direction:column;gap:8px}

/* LR items */
.lr-item{
  background:var(--bg-card);border-radius:var(--radius-lg);padding:16px;
  margin:0 16px 10px;border:1px solid var(--border-light);
  display:flex;align-items:flex-start;gap:12px;
}
.lr-header{display:flex;align-items:center;gap:8px;margin-bottom:4px;font-size:12px;color:var(--text-secondary);flex-wrap:wrap}
.lr-time{color:var(--text-tertiary)}
.lr-subject{font-size:11px;padding:1px 8px;border-radius:var(--radius-full);background:var(--color-primary-light);color:var(--color-primary);font-weight:600}
.lr-question{font-size:14px;color:var(--color-text);line-height:1.5}
.lr-kp{font-size:12px;color:var(--color-primary);margin-top:4px;font-weight:600}
.lr-icon{width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0}
.lr-icon-tutoring{background:#CCFBF1}.lr-icon-preview{background:#FEF3C7}.lr-icon-review{background:#EDE9FE}
.lr-content{flex:1;min-width:0}
.lr-title{font-family:var(--font-display);font-size:14px;font-weight:800;color:var(--color-text);line-height:1.5;margin-bottom:4px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.lr-meta{font-size:12px;color:var(--text-tertiary)}
.lr-arrow{font-size:16px;color:var(--text-tertiary);flex-shrink:0;align-self:center}

/* ===================================================================
   ERROR BOOK
   =================================================================== */
.errorbook-scroll{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;padding:16px;background:var(--bg-page)}
.eb-summary{background:var(--bg-card);border-radius:var(--radius-lg);padding:20px 16px 16px;margin-bottom:16px;border:1px solid var(--border-light)}
.eb-stats-row{display:flex;justify-content:space-around;margin-bottom:16px}
.eb-stat-item{display:flex;flex-direction:column;align-items:center;gap:4px}
.eb-stat-num{font-family:var(--font-display);font-size:28px;font-weight:800;color:var(--color-text);line-height:1;letter-spacing:-.02em}
.eb-stat-label{font-size:12px;color:var(--text-tertiary)}
.eb-stats-actions{display:flex;gap:8px}
.eb-review-all-btn{flex:1;padding:10px;border:none;border-radius:var(--radius-sm);background:#D1FAE5;color:#065F46;font-size:13px;font-weight:700;cursor:pointer;font-family:var(--font-family)}
.eb-review-all-btn:active{background:#A7F3D0}
.eb-export-btn{flex:1;padding:10px;border:none;border-radius:var(--radius-sm);background:var(--bg-muted);color:var(--text-secondary);font-size:13px;font-weight:600;cursor:pointer;font-family:var(--font-family)}
.eb-export-btn:active{background:var(--border-light)}
.eb-filters{margin-bottom:10px}
.eb-filter-row{display:flex;gap:6px;overflow-x:auto;padding-bottom:4px;margin-bottom:6px;-webkit-overflow-scrolling:touch}
.eb-filter-tag{padding:7px 16px;border-radius:var(--radius-full);border:1px solid var(--border-light);background:var(--bg-card);font-size:13px;font-weight:600;color:var(--text-secondary);cursor:pointer;font-family:var(--font-family);transition:all .15s var(--ease-out);white-space:nowrap}
.eb-filter-tag.active{background:var(--color-primary);color:#fff;border-color:var(--color-primary)}
.add-mistake-btn{width:100%;padding:14px;border-radius:var(--radius-md);border:2px dashed var(--border-light);background:var(--bg-card);font-size:14px;font-weight:600;color:var(--text-secondary);cursor:pointer;font-family:var(--font-family);margin-bottom:16px;transition:all .15s var(--ease-out)}
.add-mistake-btn:active{background:var(--color-primary-light);border-color:var(--color-primary);color:var(--color-primary)}
.eb-list{display:flex;flex-direction:column;gap:8px}
.eb-card{background:var(--bg-card);border-radius:var(--radius-lg);border:1px solid var(--border-light);overflow:hidden;transition:all .15s var(--ease-out);margin-bottom:8px}
.eb-card:active{transform:scale(.985)}
.eb-card-header{padding:16px;cursor:pointer;display:flex;align-items:flex-start;justify-content:space-between;gap:10px}
.eb-subj-tag,.eb-tag{display:inline-block;padding:3px 10px;border-radius:var(--radius-full);font-size:11px;font-weight:600;flex-shrink:0}
.eb-q{flex:1;font-size:13px;color:var(--color-text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:500}
.eb-time{font-size:11px;color:var(--text-tertiary);flex-shrink:0}
.eb-arrow{font-size:12px;color:var(--text-tertiary);transition:transform .2s;flex-shrink:0}
.eb-expanded .eb-arrow{transform:rotate(180deg)}
.eb-card-body{display:none;padding:0 16px 16px;border-top:1px solid var(--border-light);margin:0 16px}
.eb-expanded .eb-card-body{display:block}
.eb-kp{font-size:12px;color:var(--color-primary);margin-bottom:6px;font-weight:600}
.eb-full-question{padding:12px;background:var(--bg-input);border-radius:var(--radius-sm);font-size:14px;line-height:1.6;color:var(--color-text);margin-top:12px;white-space:pre-wrap;overflow-wrap:break-word;word-break:normal}
.eb-reply{margin-top:10px;padding:12px;background:var(--bg-muted);border-radius:var(--radius-sm);font-size:14px;line-height:1.6;color:var(--text-secondary)}
.eb-notes{margin-top:10px;padding:10px 12px;background:#FFFBEB;border-radius:var(--radius-sm);font-size:13px;line-height:1.5;color:#78350F;cursor:text}
.eb-notes-placeholder{color:var(--text-tertiary);font-style:italic}
.eb-notes-edit{width:100%;padding:8px;border:1px solid var(--color-primary);border-radius:var(--radius-sm);font-size:13px;font-family:var(--font-family);resize:vertical;outline:none;background:var(--bg-card);min-height:60px}
.eb-actions{display:flex;gap:8px;margin-top:12px;flex-wrap:wrap}
.eb-actions button{padding:7px 14px;border-radius:var(--radius-full);border:1px solid var(--border-light);background:var(--bg-card);font-size:12px;color:var(--text-secondary);cursor:pointer;font-family:var(--font-family);transition:all .15s var(--ease-out)}
.eb-actions button:active{background:var(--color-primary-light);border-color:var(--color-primary);color:var(--color-primary)}
.eb-empty{text-align:center;padding:60px 24px}
.eb-empty-icon{font-size:52px;margin-bottom:16px;opacity:.5}
.eb-empty p{font-size:14px;color:var(--text-secondary);margin-bottom:4px;line-height:1.6}
.eb-empty-btn{margin-top:14px;padding:10px 24px;background:var(--color-primary);color:#fff;border:none;border-radius:var(--radius-sm);font-size:13px;font-weight:600;cursor:pointer;font-family:var(--font-family)}
.eb-manual-tag{font-size:10px;color:var(--text-tertiary);background:var(--bg-muted);padding:2px 6px;border-radius:4px;flex-shrink:0}
.eb-photo{margin-bottom:8px}
.eb-photo img{max-width:200px;border-radius:8px}
.eb-no-reply{font-size:12px;color:var(--text-tertiary);padding:10px;background:var(--bg-muted);border-radius:8px;text-align:center;margin-bottom:8px}

/* Export */
.export-range-btn,.export-fmt-btn{flex:1;padding:10px 8px;border-radius:var(--radius-sm);border:1.5px solid var(--border-light);background:var(--bg-card);font-size:13px;color:var(--text-secondary);cursor:pointer;font-family:var(--font-family);transition:all .15s var(--ease-out)}
.export-range-btn.active,.export-fmt-btn.active{border-color:var(--color-primary);background:var(--color-primary-light);color:var(--color-primary);font-weight:700}

/* ===================================================================
   MODALS
   =================================================================== */
.modal{
  position:fixed;top:0;left:0;right:0;bottom:0;z-index:1000;
  display:flex;align-items:flex-end;justify-content:center;
  visibility:visible;opacity:1;transition:visibility 0s,opacity .25s var(--ease-out);
}
.modal.hidden{visibility:hidden;opacity:0;transition:visibility 0s .3s,opacity .25s var(--ease-out)}
.modal-backdrop{position:absolute;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.3);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);transition:opacity .25s var(--ease-out)}
.modal.hidden .modal-backdrop{opacity:0}
.modal-content{
  position:relative;background:var(--bg-card);border-radius:20px 20px 0 0;
  width:100%;max-width:480px;max-height:85vh;overflow-y:auto;
  -webkit-overflow-scrolling:touch;box-shadow:0 -4px 32px rgba(0,0,0,.1);
  transform:translateY(0);transition:transform .35s cubic-bezier(.34,1.56,.64,1);
  padding:20px 16px 28px;
}
.modal.hidden .modal-content{transform:translateY(100%)}
.modal-content::before{content:'';display:block;width:36px;height:5px;background:var(--border-light);border-radius:3px;margin:8px auto}
.modal-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px 12px;border-bottom:1px solid var(--border-light)}
.modal-header h3{font-family:var(--font-display);font-size:17px;font-weight:800;color:var(--color-text);margin:0}
.modal-close{width:32px;height:32px;border-radius:50%;border:none;background:var(--bg-input);font-size:18px;color:var(--text-secondary);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s var(--ease-out)}
.modal-close:active{background:var(--border-light)}
.modal-body{padding:0 20px 24px}

/* ===================================================================
   FORMS
   =================================================================== */
.form-group{margin-bottom:20px}
.form-group label{display:block;font-family:var(--font-display);font-size:14px;font-weight:800;color:var(--color-text);margin-bottom:8px}
.form-group textarea{width:100%;min-height:50px;padding:12px 14px;border:1.5px solid var(--border-light);border-radius:var(--radius-md);font-size:15px;font-family:var(--font-family);font-weight:500;resize:vertical;background:var(--bg-input);color:var(--color-text);line-height:1.5;transition:border .15s var(--ease-out)}
.form-group textarea:focus{outline:none;border-color:var(--color-primary)}
.selector{width:100%;padding:12px 14px;border:1.5px solid var(--border-light);border-radius:var(--radius-md);font-size:15px;color:var(--color-text);background:var(--bg-input);font-family:var(--font-family);font-weight:500;appearance:none;-webkit-appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M6 8L1 3h10z' fill='%23A8A29E'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center}
.selector:focus{outline:none;border-color:var(--color-primary)}
.toggle-btns{display:flex;gap:8px}
.btn-toggle{flex:1;padding:10px;border-radius:var(--radius-md);border:1.5px solid var(--border-light);background:var(--bg-card);font-size:14px;cursor:pointer;font-family:var(--font-family);color:var(--text-secondary);transition:all .15s var(--ease-out)}
.btn-toggle.active{background:var(--color-primary);color:#fff;border-color:var(--color-primary)}
.emoji-toggle{display:flex;gap:8px}
.btn-emoji{flex:1;display:flex;flex-direction:column;align-items:center;gap:6px;padding:14px 8px;border-radius:var(--radius-md);border:1.5px solid var(--border-light);background:var(--bg-card);cursor:pointer;font-family:var(--font-family);transition:all .15s var(--ease-out)}
.btn-emoji .emoji-big{font-size:28px}
.btn-emoji .emoji-label{font-size:12px;color:var(--text-secondary)}
.btn-emoji.active{border-color:var(--color-primary);background:var(--color-primary-light)}
.btn-emoji.active .emoji-label{color:var(--color-primary);font-weight:700}
.form-input{width:100%;padding:12px 14px;border:1.5px solid var(--border-light);border-radius:var(--radius-md);font-size:15px;color:var(--color-text);background:var(--bg-input);font-family:var(--font-family);font-weight:500;resize:vertical;box-sizing:border-box;transition:border .15s var(--ease-out)}
.form-input:focus{outline:none;border-color:var(--color-primary)}
.form-input::placeholder{color:var(--text-tertiary)}
.form-hint{font-size:12px;color:var(--text-tertiary);line-height:1.5;margin-top:6px}

/* ===================================================================
   CREATE TEACHER
   =================================================================== */
.teacher-form-content{max-height:80vh}
.ct-card{flex:1;padding:14px 10px;border-radius:var(--radius-md);border:1.5px solid var(--border-light);background:var(--bg-card);cursor:pointer;font-size:14px;font-weight:600;color:var(--text-secondary);font-family:var(--font-family);text-align:center;transition:all .15s var(--ease-out)}
.ct-card.active{border-color:var(--color-primary);background:var(--color-primary-light);color:var(--color-primary)}
.ct-card small{display:block;font-size:11px;font-weight:500;opacity:.7;margin-top:2px}
.ct-subjects,.ct-gender,.ct-age{display:flex;gap:8px}
.ct-tags{display:flex;flex-wrap:wrap;gap:8px}
.ct-tag{padding:8px 16px;border-radius:var(--radius-full);border:1.5px solid var(--border-light);background:var(--bg-card);font-size:13px;color:var(--text-secondary);cursor:pointer;font-family:var(--font-family);transition:all .15s var(--ease-out)}
.ct-tag.active{border-color:var(--color-primary);background:var(--color-primary-light);color:var(--color-primary);font-weight:700}

/* ===================================================================
   SHARE
   =================================================================== */
.share-card{background:linear-gradient(135deg,#CCFBF1,#F8F6F3);border-radius:var(--radius-lg);padding:20px;margin-bottom:16px;text-align:center}
.share-card-top{font-size:13px;color:var(--color-primary);font-weight:700;margin-bottom:12px}
.share-card-body{background:var(--bg-card);border-radius:var(--radius-md);padding:14px;margin-bottom:10px;border:1px solid var(--border-light)}
.share-card-question{font-size:14px;color:var(--color-text);line-height:1.5;margin-bottom:6px}
.share-card-teacher{font-size:12px;color:var(--text-tertiary)}
.share-card-point{font-size:13px;color:var(--text-secondary);margin-bottom:12px}
.share-card-bottom{font-size:12px;color:var(--text-tertiary)}
.share-card-qr-box{width:60px;height:60px;margin:8px auto 0;background:var(--bg-card);border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-size:28px}
#share-screenshot{background:var(--color-primary);color:#fff;border:none;width:100%;padding:14px;border-radius:var(--radius-md);font-size:15px;font-weight:600;cursor:pointer;font-family:var(--font-family);margin-bottom:8px;transition:all .15s var(--ease-out)}
#share-screenshot:active{transform:scale(.97)}
#share-copy-link,#share-wechat{background:var(--bg-card);color:var(--color-text);border:1.5px solid var(--border-light);width:100%;padding:14px;border-radius:var(--radius-md);font-size:15px;font-weight:500;cursor:pointer;font-family:var(--font-family);margin-bottom:8px;transition:all .15s var(--ease-out)}
#share-copy-link:active,#share-wechat:active{background:var(--bg-input)}
.share-hint{font-size:12px;color:var(--text-tertiary);text-align:center;margin-top:4px}

/* ===================================================================
   TOAST
   =================================================================== */
.toast{position:fixed;top:60px;left:50%;z-index:2000;padding:12px 24px;background:#1C1917;color:#fff;border-radius:var(--radius-md);font-size:14px;font-weight:600;font-family:var(--font-family);box-shadow:var(--shadow-lg);opacity:1;transform:translateX(-50%) translateY(0);transition:opacity .25s var(--ease-out),transform .25s var(--ease-out);max-width:90vw;text-align:center;pointer-events:none}
.toast.hidden,.toast.hiding{display:block!important;opacity:0;transform:translateX(-50%) translateY(-8px)}

/* ===================================================================
   CONVERSATION LIST
   =================================================================== */
.conv-list{display:flex;flex-direction:column;gap:6px;margin-top:12px;max-height:50vh;overflow-y:auto}
.conv-list>div{padding:14px 16px;background:var(--bg-card);border-radius:var(--radius-md);border:1px solid var(--border-light);cursor:pointer;transition:all .15s var(--ease-out);font-size:14px;color:var(--color-text)}
.conv-list>div:active{background:var(--bg-input)}
.conv-item{display:flex;align-items:center;justify-content:space-between;padding:12px;border:1px solid var(--border-light);border-radius:var(--radius-md);cursor:pointer;transition:all .15s var(--ease-out);background:var(--bg-card);gap:10px}
.conv-item.active{border-color:var(--color-primary);background:var(--color-primary-light)}
.conv-item-main{flex:1;min-width:0}
.conv-item-title{font-family:var(--font-display);font-size:15px;font-weight:800;color:var(--color-text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.conv-item-meta{display:flex;align-items:center;gap:8px;margin-top:2px;font-size:12px;color:var(--text-secondary)}
.conv-item-subject{font-size:11px;padding:1px 8px;border-radius:var(--radius-full);background:var(--color-primary-light);color:var(--color-primary);font-weight:600}
.conv-item-right{display:flex;align-items:center;gap:8px;flex-shrink:0}
.conv-item-time{font-size:11px;color:var(--text-tertiary)}
.conv-item-del{border:none;background:none;font-size:16px;cursor:pointer;opacity:.4;padding:4px;min-width:32px}
.conv-item-del:hover{opacity:1;color:var(--color-danger)}

/* Not understood menu */
.not-understood-menu{background:var(--bg-card);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);padding:6px;display:flex;flex-direction:column;gap:4px;min-width:180px;animation:nufade .15s var(--ease-out)}
@keyframes nufade{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}
.not-understood-menu button{border:none;background:none;padding:10px 14px;border-radius:var(--radius-sm);font-size:13px;cursor:pointer;text-align:left;font-family:var(--font-family);font-weight:500;transition:background .15s}
.not-understood-menu button:hover{background:var(--bg-input)}
.num-retry{color:var(--color-primary)}
.num-mark{color:var(--text-secondary)}

/* ===================================================================
   PICK AVATAR TEXT & MISTAKE PHOTO
   =================================================================== */
.pick-avatar-text{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:50%;color:#fff;font-size:.875rem;font-weight:700}
.mistake-form-content{max-height:80vh;overflow-y:auto}
.mistake-form-content .form-group{margin-bottom:14px}
.mistake-form-content .form-input{width:100%;padding:10px 12px;border:1px solid var(--border-light);border-radius:var(--radius-sm);font-size:14px;font-family:var(--font-family)}
.mistake-form-content label{font-size:13px;color:var(--text-secondary);display:block;margin-bottom:4px}
#mistake-photo-btn{padding:14px;border-radius:var(--radius-md);border:2px dashed var(--border-light);background:var(--bg-card);font-size:14px;color:var(--text-secondary);cursor:pointer;font-family:var(--font-family);transition:all .15s var(--ease-out)}
#mistake-photo-btn:active{background:var(--color-primary-light);border-color:var(--color-primary);color:var(--color-primary)}
#mistake-photo-preview img{max-width:100%;max-height:160px;border-radius:10px;border:1px solid var(--border-light);object-fit:contain}
#mistake-save{margin-top:6px}
#mistake-cancel{display:block;width:100%;margin-top:8px}

/* ===================================================================
   PRINT EXPORT
   =================================================================== */
.card{background:#fff;border-radius:var(--radius-lg);padding:20px;margin-bottom:16px;page-break-inside:avoid;border:1px solid #e2e8f0}
.card .subject{padding:3px 10px;border-radius:var(--radius-full);font-size:11px;font-weight:700;display:inline-block;margin-bottom:8px}
.card .subject.red{background:#fee2e2;color:#991b1b}
.card .subject.blue{background:#dbeafe;color:#1e40af}
.card .subject.green{background:#d1fae5;color:#065f46}
.card .question{font-size:14px;font-weight:700;color:#1e293b;margin-bottom:8px}
.card .answer{font-size:13px;color:#475569;line-height:1.7}
.card .answer p{margin-bottom:0}
.card .notes{font-size:12px;color:#92400e;margin-top:8px;padding:8px;background:#fffbeb;border-radius:var(--radius-sm)}
.card .meta{font-size:11px;color:#94a3b8;margin-top:8px}
.date{font-size:12px;color:#94a3b8;text-align:center;margin:16px 0}

/* ===================================================================
   UTILITIES
   =================================================================== */
.hidden{display:none!important}

/* ===================================================================
   REDUCED MOTION
   =================================================================== */
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}