/* 英语单词默写 - 字母填空进阶版 */
:root {
  --primary: #4f46e5; --primary-hover: #4338ca; --success: #10b981;
  --danger: #ef4444; --warning: #f59e0b; --bg: #f8fafc;
  --card-bg: #ffffff; --text: #1e293b; --text-secondary: #64748b;
  --border: #e2e8f0; --shadow: 0 1px 3px rgba(0,0,0,0.1);
  --radius: 12px; --transition: all 0.2s ease;
}
[data-theme="dark"] { --bg:#0f172a;--card-bg:#1e293b;--text:#f1f5f9;--text-secondary:#94a3b8;--border:#334155;--shadow:0 1px 3px rgba(0,0,0,0.3); }
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;line-height:1.6}
.container{max-width:800px;margin:0 auto;padding:16px}
.header{display:flex;justify-content:space-between;align-items:center;padding:16px 0;border-bottom:1px solid var(--border);margin-bottom:20px}
.header h1{font-size:1.4rem;background:linear-gradient(135deg,#4f46e5,#7c3aed);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.header-actions{display:flex;gap:8px}
.theme-btn,.back-btn{background:var(--card-bg);border:1px solid var(--border);border-radius:8px;padding:8px 12px;cursor:pointer;color:var(--text);font-size:1rem;transition:var(--transition)}
.theme-btn:hover,.back-btn:hover{background:var(--border)}
.card{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin-bottom:16px;box-shadow:var(--shadow)}
.card h2{font-size:1.1rem;margin-bottom:12px}
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px}
.stat-card{text-align:center;padding:14px;background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius)}
.stat-card .value{font-size:1.8rem;font-weight:700;color:var(--primary)}
.stat-card .label{font-size:.8rem;color:var(--text-secondary);margin-top:2px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 20px;border:none;border-radius:8px;cursor:pointer;font-size:.9rem;font-weight:500;transition:var(--transition);text-decoration:none;font-family:inherit}
.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-hover);transform:translateY(-1px)}
.btn-success{background:var(--success);color:#fff}.btn-danger{background:var(--danger);color:#fff}
.btn-outline{background:transparent;border:2px solid var(--border);color:var(--text)}.btn-outline:hover{border-color:var(--primary);color:var(--primary)}
.btn-lg{padding:14px 28px;font-size:1.05rem;border-radius:12px}.btn-block{width:100%}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-sm{padding:6px 14px;font-size:.8rem}

/* === Login Page === */
.login-card{max-width:420px;margin:40px auto}
.login-icon{text-align:center;font-size:3rem;margin-bottom:8px}
.login-section{margin-bottom:16px}
.login-divider{display:flex;align-items:center;margin:16px 0;color:var(--text-secondary);font-size:.85rem}
.login-divider::before,.login-divider::after{content:"";flex:1;border-bottom:1px solid var(--border)}
.login-divider span{padding:0 12px}
.country-code{padding:12px;border:2px solid var(--border);border-radius:8px;background:var(--card-bg);color:var(--text);font-size:.9rem;width:80px}
.full-input{width:100%;padding:12px 16px;border:2px solid var(--border);border-radius:8px;font-size:.95rem;background:var(--card-bg);color:var(--text);outline:none;transition:var(--transition)}
.full-input:focus{border-color:var(--primary)}

/* === Word Bank === */
.wordbank-list{display:grid;gap:8px}
.wordbank-item{display:flex;align-items:center;gap:12px;padding:12px 14px;background:var(--card-bg);border:2px solid var(--border);border-radius:var(--radius);cursor:pointer;transition:var(--transition);user-select:none}
.wordbank-item:hover{border-color:var(--primary)}.wordbank-item.selected{border-color:var(--primary);background:rgba(79,70,229,.05)}
.wordbank-item .checkbox{width:20px;height:20px;border:2px solid var(--border);border-radius:5px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.wordbank-item.selected .checkbox{background:var(--primary);border-color:var(--primary)}
.wordbank-item.selected .checkbox::after{content:"✓";color:#fff;font-size:13px;font-weight:700}
.wordbank-info{flex:1}.wordbank-info .name{font-weight:600;font-size:.95rem}.wordbank-info .count{font-size:.78rem;color:var(--text-secondary)}
.option-row{display:flex;align-items:center;gap:10px;margin:10px 0}
.option-row label{font-weight:500;font-size:.9rem;white-space:nowrap}
.option-row select,.option-row input{padding:8px 12px;border:2px solid var(--border);border-radius:8px;background:var(--card-bg);color:var(--text);font-size:.9rem}

/* === Dictation - Letter Grid === */
.progress-bar{width:100%;height:6px;background:var(--border);border-radius:3px;margin-bottom:6px;overflow:hidden}
.progress-fill{height:100%;background:linear-gradient(90deg,var(--primary),#7c3aed);border-radius:3px;transition:width .3s ease}
.progress-info{display:flex;justify-content:space-between;margin-bottom:16px;font-size:.85rem;color:var(--text-secondary);flex-wrap:wrap;gap:8px}
.dictation-card{text-align:center;padding:30px 20px}
.dictation-card .chinese-word{font-size:2.2rem;font-weight:700;margin-bottom:4px}
.dictation-card .phonetic-display{font-size:.9rem;color:var(--text-secondary);margin-bottom:2px}
.dictation-card .phonetic-display span{margin:0 8px}

/* UK/US audio buttons */
.audio-buttons{display:flex;gap:12px;justify-content:center;margin:12px 0}
.audio-btn{background:var(--card-bg);border:2px solid var(--border);border-radius:50%;width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;font-size:1.1rem;transition:var(--transition)}
.audio-btn:hover{border-color:var(--primary);transform:scale(1.08)}
.audio-btn.playing{border-color:var(--primary);background:rgba(79,70,229,.1);animation:audio-pulse .5s ease}
.audio-btn-single{width:52px;height:52px;font-size:1.4rem}
.audio-label{font-size:.7rem;color:var(--text-secondary);margin-top:4px}
@keyframes audio-pulse{0%{transform:scale(1)}50%{transform:scale(1.15)}100%{transform:scale(1)}}

/* Letter Grid */
.letter-grid{display:flex;gap:6px;justify-content:center;flex-wrap:wrap;margin:24px auto;max-width:100%;padding:0 10px}
.letter-cell{width:42px;height:50px;border-bottom:3px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:1.4rem;font-weight:700;cursor:pointer;transition:var(--transition);position:relative;color:var(--text);font-family:monospace}
.letter-cell.active{border-bottom-color:var(--primary);background:rgba(79,70,229,.05)}
.letter-cell.filled{border-bottom-color:var(--primary)}
.letter-cell.correct-cell{border-bottom-color:var(--success);color:var(--success);background:rgba(16,185,129,.08)}
.letter-cell.wrong-cell{border-bottom-color:var(--danger);color:var(--danger);background:rgba(239,68,68,.08);animation:shake .5s}
.letter-cell .cursor{position:absolute;bottom:-3px;left:0;right:0;height:3px;background:var(--primary);animation:blink 1s infinite}
@keyframes blink{0%,100%{opacity:1}50%{opacity:0}}

/* Result area in dictation */
.dict-result{margin-top:12px;padding:12px;border-radius:var(--radius);text-align:center;font-size:.95rem}
.dict-result.correct{background:rgba(16,185,129,.08);border:1px solid var(--success);color:var(--success)}
.dict-result.wrong{background:rgba(239,68,68,.08);border:1px solid var(--danger);color:var(--danger)}
.dict-result .correct-word{font-size:1.3rem;font-weight:700;margin:4px 0;letter-spacing:2px}

/* Etymology panel */
.etymology-toggle{margin-top:16px;font-size:.85rem;color:var(--primary);cursor:pointer;text-decoration:underline;transition:var(--transition)}
.etymology-toggle:hover{color:var(--primary-hover)}
.etymology-panel{margin-top:10px;padding:14px;background:rgba(79,70,229,.04);border:1px solid var(--border);border-radius:var(--radius);text-align:left;font-size:.85rem;display:none}
.etymology-panel.show{display:block}
.etymology-row{display:flex;gap:8px;margin-bottom:4px;align-items:baseline}
.etymology-row .etym-part{font-weight:600;color:var(--primary);min-width:60px}
.etymology-row .etym-text{flex:1}
.etymology-summary{margin-top:8px;padding-top:8px;border-top:1px dashed var(--border);color:var(--text-secondary);font-style:italic}

/* Keyboard hints */
.keyboard-hints{margin-top:14px;font-size:.78rem;color:var(--text-secondary)}
.keyboard-hints kbd{background:var(--border);padding:2px 7px;border-radius:4px;font-family:monospace;font-size:.75rem;border:1px solid var(--text-secondary)}

/* === Results === */
.score-circle{width:120px;height:120px;border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;margin:0 auto 16px;border:6px solid}
.score-circle .score-num{font-size:2.3rem;font-weight:800;line-height:1}
.score-circle .score-label{font-size:.78rem;margin-top:2px}
.score-excellent{border-color:var(--success);color:var(--success)}.score-good{border-color:var(--primary);color:var(--primary)}
.score-fair{border-color:var(--warning);color:var(--warning)}.score-poor{border-color:var(--danger);color:var(--danger)}
.result-stats{display:flex;justify-content:center;gap:28px;margin:12px 0}
.result-stat{text-align:center}.result-stat .num{font-size:1.4rem;font-weight:700}.result-stat .lbl{font-size:.78rem;color:var(--text-secondary)}
.error-list{max-height:350px;overflow-y:auto}
.error-item{display:flex;justify-content:space-between;align-items:center;padding:12px;border-bottom:1px solid var(--border);gap:8px;flex-wrap:wrap}
.error-item .wrong-word{color:var(--danger);text-decoration:line-through}.error-item .correct-word{color:var(--success);font-weight:600}
.error-item .chinese-meaning{color:var(--text-secondary);font-size:.82rem}

/* === Chart === */
.chart-container{height:180px;display:flex;align-items:flex-end;gap:8px;padding:16px 0 28px}
.chart-bar{flex:1;background:linear-gradient(180deg,var(--primary),#7c3aed);border-radius:5px 5px 0 0;min-height:3px;position:relative;transition:height .5s ease}
.chart-bar .bar-label{position:absolute;bottom:-22px;left:50%;transform:translateX(-50%);font-size:.68rem;color:var(--text-secondary);white-space:nowrap}
.chart-bar .bar-value{position:absolute;top:-18px;left:50%;transform:translateX(-50%);font-size:.7rem;font-weight:600}

/* === Error Book === */
.error-book-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;flex-wrap:wrap;gap:8px}
.error-book-stats{color:var(--text-secondary);font-size:.85rem;margin-bottom:8px}
.error-book-item{display:flex;align-items:center;padding:12px;border-bottom:1px solid var(--border);gap:10px;flex-wrap:wrap}
.error-book-item .word-main{font-size:1.05rem;font-weight:600}.error-book-item .word-chinese{color:var(--text-secondary);font-size:.85rem}
.error-book-item .error-count{background:rgba(239,68,68,.1);color:var(--danger);padding:2px 10px;border-radius:12px;font-size:.78rem;font-weight:600;white-space:nowrap}

/* === Bottom Tab Bar === */
.bottom-nav{display:none;position:fixed;bottom:0;left:0;right:0;background:var(--card-bg);border-top:1px solid var(--border);z-index:100;padding:6px 0 env(safe-area-inset-bottom,6px)}
.bottom-nav .tab-inner{display:flex;max-width:600px;margin:0 auto}
.bottom-nav .tab-item{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:6px 4px;cursor:pointer;color:var(--text-secondary);font-size:.7rem;transition:var(--transition);border:none;background:none;font-family:inherit;gap:2px;text-decoration:none}
.bottom-nav .tab-item .tab-icon{font-size:1.3rem}
.bottom-nav .tab-item.active{color:var(--primary)}
.bottom-nav .tab-item:hover{color:var(--primary)}
body.has-tabbar{padding-bottom:70px}

/* === Profile improvements === */
.profile-section{margin-bottom:20px}
.bind-item{display:flex;justify-content:space-between;align-items:center;padding:14px 0;border-bottom:1px solid var(--border);gap:10px}
.bind-item .bind-left{display:flex;align-items:center;gap:10px;min-width:0}
.bind-item .bind-icon{font-size:1.3rem;flex-shrink:0}
.bind-item .bind-info{min-width:0}
.bind-item .bind-info .bind-label{font-weight:500;font-size:.9rem}
.bind-item .bind-info .bind-value{font-size:.78rem;color:var(--text-secondary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.bind-item .bind-actions{display:flex;gap:6px;flex-shrink:0}
.bind-item .bind-status{font-size:.75rem;padding:3px 8px;border-radius:10px;font-weight:500;white-space:nowrap}
.bind-status.bound{background:rgba(16,185,129,.1);color:var(--success)}
.bind-status.unbound{background:rgba(239,68,68,.08);color:var(--danger)}

/* === Empty State === */
.empty-state{text-align:center;padding:50px 20px;color:var(--text-secondary)}
.empty-state .icon{font-size:3.5rem;margin-bottom:12px}.empty-state h3{margin-bottom:6px;color:var(--text)}

/* === Animations === */
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}
@keyframes flash-green{0%{box-shadow:0 0 0 0 rgba(16,185,129,.4)}70%{box-shadow:0 0 0 12px rgba(16,185,129,0)}100%{box-shadow:0 0 0 0 rgba(16,185,129,0)}}
.flash-correct{animation:flash-green .6s ease}

/* === Utilities === */
.text-center{text-align:center}.mt-1{margin-top:8px}.mt-2{margin-top:16px}.mt-3{margin-top:24px}
.page{display:none}.page.active{display:block}
.mode-badge{display:inline-block;padding:3px 12px;border-radius:20px;font-size:.78rem;font-weight:600}
.mode-normal{background:rgba(79,70,229,.1);color:var(--primary)}.mode-review{background:rgba(245,158,11,.1);color:var(--warning)}
.hint-text{font-size:1.2rem;letter-spacing:5px;font-weight:600;color:var(--warning);margin:8px 0;font-family:monospace}

/* === Mode Selection Grid === */
.mode-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.mode-card{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:14px 8px;background:var(--card-bg);border:2px solid var(--border);border-radius:var(--radius);cursor:pointer;transition:var(--transition);user-select:none;text-align:center}
.mode-card:hover{border-color:var(--primary);transform:translateY(-2px)}
.mode-card.active{border-color:var(--primary);background:rgba(79,70,229,.08);box-shadow:0 0 0 2px rgba(79,70,229,.2)}
.mode-card .mode-icon{font-size:1.6rem;margin-bottom:4px}
.mode-card .mode-name{font-size:.78rem;font-weight:600;color:var(--text);line-height:1.2}

/* === Combo Badge === */
.combo-badge{display:inline-block;padding:4px 14px;background:linear-gradient(135deg,#f59e0b,#ef4444);color:#fff;border-radius:20px;font-weight:700;font-size:.85rem;animation:combo-pop .3s ease}
@keyframes combo-pop{0%{transform:scale(.5);opacity:0}100%{transform:scale(1);opacity:1}}

/* === Choice Buttons === */
.choice-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:16px 0}
.choice-btn{display:flex;align-items:center;gap:10px;padding:14px 16px;background:var(--card-bg);border:2px solid var(--border);border-radius:var(--radius);cursor:pointer;transition:var(--transition);text-align:left;font-size:.95rem;font-family:inherit}
.choice-btn:hover{border-color:var(--primary)}
.choice-btn.selected{border-color:var(--primary);background:rgba(79,70,229,.08)}
.choice-btn:disabled{cursor:default}
.choice-btn.choice-correct{border-color:var(--success);background:rgba(16,185,129,.1);color:var(--success)}
.choice-btn.choice-wrong{border-color:var(--danger);background:rgba(239,68,68,.08);color:var(--danger);animation:shake .4s}
.choice-letter{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:50%;background:var(--border);font-weight:700;font-size:.85rem;flex-shrink:0}
.choice-btn.selected .choice-letter{background:var(--primary);color:#fff}
.choice-btn.choice-correct .choice-letter{background:var(--success);color:#fff}
.choice-btn.choice-wrong .choice-letter{background:var(--danger);color:#fff}
.choice-text{flex:1;word-break:break-word}

/* === English Word Display (for en-to-cn, word-meaning) === */
.english-word-display{font-size:2.2rem;font-weight:700;margin-bottom:4px;color:var(--primary)}
.listen-prompt{font-size:1.1rem;color:var(--text-secondary);margin-bottom:8px}

/* === Extra Stats === */
.extra-stats{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:8px}
.extra-stat{text-align:center;padding:8px 16px;background:var(--card-bg);border:1px solid var(--border);border-radius:8px}
.extra-stat span{display:block;font-size:.75rem;color:var(--text-secondary)}
.extra-stat strong{font-size:1rem;color:var(--primary)}

/* === Flashcard v2: 4-Stage === */
.flashcard-container{max-width:420px;margin:0 auto;padding:10px}
/* Stage indicator dots */
.fc-stage-bar{display:flex;align-items:center;justify-content:center;gap:0;margin-bottom:16px}
.fc-stage-dot{width:14px;height:14px;border-radius:50%;background:var(--border);transition:all .3s}
.fc-stage-dot.active{background:var(--primary);box-shadow:0 0 8px rgba(79,70,229,.4)}
.fc-stage-dot.done{background:var(--success)}
.fc-stage-line{width:40px;height:2px;background:var(--border);transition:all .3s}
.fc-stage-line.done{background:var(--success)}
/* Card */
.fc-card{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius);padding:36px 24px;text-align:center;min-height:300px;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow);transition:transform .25s,opacity .25s}
.fc-card.fc-correct{transform:scale(1.03)}
/* Stage 1: word display */
.fc-word-lg{font-size:2.8rem;font-weight:800;color:var(--primary);margin-bottom:12px;word-break:break-word;animation:fc-fadeIn .4s ease}
.fc-stage-label{font-size:.85rem;color:var(--text-secondary);margin-top:8px}
/* Stage 2: recall prompt */
.fc-recall-prompt{font-size:1.3rem;color:var(--text-secondary)}
.fc-recall-hint{font-size:.9rem;color:var(--warning);margin-top:12px;animation:pulse 1.5s infinite}
/* Stage 3: full info */
.fc-full-word{font-size:2rem;font-weight:700;color:var(--primary);margin-bottom:6px}
.fc-full-meaning{font-size:1.5rem;font-weight:600;margin-bottom:10px}
.fc-full-phonetic{font-size:1rem;color:var(--text-secondary);margin-bottom:4px}
.fc-full-example{font-size:.9rem;color:var(--text-secondary);font-style:italic;margin-bottom:4px}
.fc-full-example-cn{font-size:.85rem;color:var(--text-secondary)}
/* Action buttons */
.fc-actions{display:flex;gap:10px;margin-top:16px;animation:fc-slideUp .3s ease}
.fc-btn{flex:1;padding:14px 10px;border:none;border-radius:10px;font-size:.9rem;font-weight:600;cursor:pointer;transition:all .2s;font-family:inherit}
.fc-btn:active{transform:scale(.95)}
.fc-know{background:rgba(16,185,129,.12);color:var(--success);border:2px solid var(--success)}
.fc-know:hover{background:var(--success);color:#fff}
.fc-hint{background:rgba(245,158,11,.12);color:var(--warning);border:2px solid var(--warning)}
.fc-hint:hover{background:var(--warning);color:#fff}
.fc-dunno{background:rgba(239,68,68,.08);color:var(--danger);border:2px solid var(--danger)}
.fc-dunno:hover{background:var(--danger);color:#fff}
/* Timer bar */
.fc-timer-bar{width:100%;height:5px;background:var(--border);border-radius:3px;overflow:hidden;margin-top:16px}
.fc-timer-fill{height:100%;background:var(--primary);border-radius:3px;transition:width .1s linear}
@keyframes fc-fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
@keyframes fc-slideUp{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}

/* === Per-Word Timer Bar (Speed Mode) === */
.word-timer-bar{width:100%;height:6px;background:var(--border);border-radius:3px;overflow:hidden;margin-bottom:8px}
.word-timer-fill{height:100%;background:var(--success);border-radius:3px;width:100%;transition:none;will-change:width}
.word-timer-fill.warn{background:var(--warning)}
.word-timer-fill.danger{background:var(--danger);animation:timer-blink .5s infinite}
@keyframes timer-blink{0%,100%{opacity:1}50%{opacity:.4}}

/* === Interaction Polish === */
.btn:active{transform:scale(.96)}
.btn-primary:active{transform:scale(.96) translateY(1px)}
.card{transition:transform .25s,opacity .25s,box-shadow .25s}
.page.active{animation:pageIn .25s ease}
@keyframes pageIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}
/* Correct checkmark overlay */
.fc-check-overlay{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);font-size:5rem;pointer-events:none;animation:checkPop .6s ease forwards;z-index:99}
@keyframes checkPop{0%{opacity:0;transform:translate(-50%,-50%) scale(.5)}50%{opacity:1;transform:translate(-50%,-50%) scale(1.2)}100%{opacity:0;transform:translate(-50%,-50%) scale(1)}}
/* Immersive mode */
body.immersive .header,body.immersive .bottom-nav,body.immersive #btnImmersive{display:none!important}
body.immersive{padding-bottom:0!important}
body.immersive .container{padding:8px}

/* === Pulse animation (shared) === */
@keyframes pulse{0%,100%{opacity:.4}50%{opacity:1}}

/* === Profile Header v2: Hero Cover === */
.profile-header-card{position:relative;background:var(--card-bg);border-radius:var(--radius);overflow:hidden;margin-bottom:16px;box-shadow:0 4px 24px rgba(0,0,0,.12)}
/* Cover - now much taller (~50% bigger) */
.profile-cover-wrap{position:relative;height:220px;overflow:hidden;cursor:grab;user-select:none}
.profile-cover-wrap:active{cursor:grabbing}
.profile-cover-bg{position:absolute;top:0;left:0;width:100%;height:130%;background:linear-gradient(135deg,#4f46e5 0%,#7c3aed 40%,#ec4899 100%);background-size:cover;background-position:center 30%;transition:transform .4s cubic-bezier(.25,.1,.25,1);will-change:transform}
/* Gradient overlay for text readability */
.profile-cover-overlay{position:absolute;bottom:0;left:0;right:0;height:60%;background:linear-gradient(to top,rgba(0,0,0,.55) 0%,rgba(0,0,0,.25) 40%,transparent 100%);pointer-events:none}
/* Cover actions */
.profile-cover-actions{position:absolute;top:12px;right:12px;display:flex;gap:6px;z-index:3}
.profile-cover-btn{width:34px;height:34px;border-radius:50%;background:rgba(0,0,0,.45);color:#fff;border:none;cursor:pointer;font-size:1rem;display:flex;align-items:center;justify-content:center;backdrop-filter:blur(6px);transition:all .2s}
.profile-cover-btn:hover{background:rgba(0,0,0,.65);transform:scale(1.08)}
/* Avatar - floats over cover bottom */
.profile-avatar-wrap{position:relative;margin-top:-48px;padding:0 20px;display:flex;align-items:flex-end;gap:14px;z-index:2}
.profile-avatar{width:96px;height:96px;border-radius:50%;border:4px solid var(--card-bg);background:var(--bg);display:flex;align-items:center;justify-content:center;font-size:2.6rem;cursor:pointer;overflow:hidden;box-shadow:0 4px 16px rgba(0,0,0,.2);flex-shrink:0;transition:transform .2s}
.profile-avatar:hover{transform:scale(1.04)}
.profile-avatar img{width:100%;height:100%;object-fit:cover}
/* Rank badge near avatar */
.profile-rank-badge{background:rgba(0,0,0,.55);color:#fff;padding:4px 14px;border-radius:14px;font-size:.78rem;font-weight:600;margin-bottom:12px;backdrop-filter:blur(6px);white-space:nowrap}
/* Info section */
.profile-info-section{padding:8px 20px 0}
.profile-info-section h2{font-size:1.25rem;font-weight:700;cursor:pointer;margin-bottom:2px;display:flex;align-items:center;gap:6px}
.profile-info-section h2 .edit-icon{font-size:.75rem;opacity:.4;transition:opacity .2s}
.profile-info-section h2:hover .edit-icon{opacity:1}
.profile-info-section .pf-signature{color:var(--text-secondary);font-size:.85rem;cursor:pointer;margin-bottom:4px}
.profile-meta{display:flex;gap:12px;font-size:.78rem;color:var(--text-secondary);flex-wrap:wrap}

/* === XP Bars (under info) === */
.xp-section{padding:10px 20px 18px}
.xp-row{display:flex;align-items:center;gap:8px;margin-bottom:10px}
.xp-row:last-child{margin-bottom:0}
.xp-row-icon{font-size:1.1rem;flex-shrink:0}
.xp-row-info{flex:1;min-width:0}
.xp-row-header{display:flex;justify-content:space-between;font-size:.73rem;margin-bottom:3px}
.xp-row-header strong{font-size:.8rem}
.xp-bar{width:100%;height:7px;background:rgba(128,128,128,.2);border-radius:4px;overflow:hidden}
.xp-fill{height:100%;background:linear-gradient(90deg,#f59e0b,#f97316);border-radius:4px;transition:width .6s cubic-bezier(.4,0,.2,1)}
.xp-fill.rank-fill{background:linear-gradient(90deg,#6366f1,#8b5cf6)}

/* === Preset Backgrounds Picker === */
.bg-presets{display:flex;gap:8px;padding:6px 0;overflow-x:auto;flex-wrap:wrap}
.bg-preset{width:56px;height:40px;border-radius:8px;cursor:pointer;border:2px solid transparent;transition:all .2s;flex-shrink:0;background-size:cover}
.bg-preset:hover{border-color:var(--primary);transform:scale(1.08)}
.bg-preset.active{border-color:var(--primary);box-shadow:0 0 0 2px rgba(99,102,241,.3)}
.bg-preset.default-bg{background:linear-gradient(135deg,#4f46e5,#7c3aed,#ec4899)}

/* === Parallax effect === */
.profile-header-card .profile-cover-bg.parallax-active{transform:translateY(0)}

/* === Achievement Grid === */
.achievement-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.achievement-item{display:flex;flex-direction:column;align-items:center;padding:10px 6px;border-radius:var(--radius);border:1px solid var(--border);text-align:center;transition:var(--transition)}
.achievement-item.unlocked{background:rgba(79,70,229,.05);border-color:var(--primary)}
.achievement-item.locked{opacity:.35;filter:grayscale(1)}
.achievement-item .ach-icon{font-size:1.6rem;margin-bottom:2px}
.achievement-item .ach-name{font-size:.7rem;font-weight:600;line-height:1.2}

/* === Daily Tasks === */
.task-item{display:flex;align-items:center;gap:10px;padding:10px 0;border-bottom:1px solid var(--border)}
.task-item:last-child{border-bottom:none}
.task-progress{flex:1;min-width:0}
.task-progress .task-name{font-size:.85rem;font-weight:500}
.task-progress .task-bar-wrap{height:5px;background:var(--border);border-radius:3px;margin-top:4px;overflow:hidden}
.task-progress .task-bar{height:100%;background:var(--primary);border-radius:3px;transition:width .3s}
.task-reward{font-size:.75rem;color:var(--warning);font-weight:600;white-space:nowrap}
.task-claim-btn{padding:4px 12px;font-size:.75rem;border-radius:12px;border:1px solid var(--success);background:rgba(16,185,129,.1);color:var(--success);cursor:pointer;white-space:nowrap;font-family:inherit;transition:var(--transition)}
.task-claim-btn:hover{background:var(--success);color:#fff}
.task-claim-btn:disabled{opacity:.4;cursor:default}
.task-claim-btn.claimed{background:var(--border);color:var(--text-secondary);border-color:var(--border);cursor:default}

/* === Leaderboard === */
.leaderboard-tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:12px}
.lb-tab{padding:6px 14px;border-radius:20px;border:1px solid var(--border);background:var(--card-bg);color:var(--text);cursor:pointer;font-size:.8rem;font-family:inherit;transition:var(--transition);white-space:nowrap}
.lb-tab:hover{border-color:var(--primary)}
.lb-tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.lb-item{display:flex;align-items:center;gap:10px;padding:12px;border-bottom:1px solid var(--border)}
.lb-item:last-child{border-bottom:none}
.lb-item.is-me{background:rgba(79,70,229,.06);border-radius:var(--radius)}
.lb-rank{width:30px;font-weight:700;font-size:1rem;text-align:center;flex-shrink:0}
.lb-rank.gold{color:#f59e0b}.lb-rank.silver{color:#94a3b8}.lb-rank.bronze{color:#d97706}
.lb-avatar{width:36px;height:36px;border-radius:50%;background:var(--bg);display:flex;align-items:center;justify-content:center;font-size:1rem;flex-shrink:0;overflow:hidden}
.lb-avatar img{width:100%;height:100%;object-fit:cover}
.lb-info{flex:1;min-width:0}
.lb-info .lb-name{font-weight:600;font-size:.9rem}
.lb-info .lb-rank-name{font-size:.7rem;color:var(--text-secondary)}
.lb-value{font-weight:700;font-size:.95rem;color:var(--primary);white-space:nowrap}

/* === Heatmap === */
.heatmap-container{display:flex;gap:3px;flex-wrap:wrap;justify-content:flex-start;overflow-x:auto;padding:4px 0;max-height:160px}
.heatmap-cell{width:13px;height:13px;border-radius:3px;background:var(--border);flex-shrink:0}
.heatmap-cell.l0{background:var(--border)}
.heatmap-cell.l1{background:rgba(79,70,229,.2)}
.heatmap-cell.l2{background:rgba(79,70,229,.4)}
.heatmap-cell.l3{background:rgba(79,70,229,.7)}
.heatmap-cell.l4{background:#4f46e5}
.heatmap-legend{display:flex;align-items:center;gap:4px;justify-content:center;margin-top:8px;font-size:.7rem;color:var(--text-secondary)}
.hm-lev{width:12px;height:12px;border-radius:3px;flex-shrink:0}
.hm-lev0{background:var(--border)}.hm-lev1{background:rgba(79,70,229,.2)}.hm-lev2{background:rgba(79,70,229,.4)}.hm-lev3{background:rgba(79,70,229,.7)}.hm-lev4{background:#4f46e5}

/* === is-blank cell highlight === */
.letter-cell.is-blank{background:rgba(79,70,229,.06);border-bottom-color:var(--warning)}

/* === Quick Translator === */
.quick-translator{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius);padding:12px;margin-bottom:14px;box-shadow:var(--shadow)}
.qt-search-row{display:flex;align-items:center;gap:8px}
.qt-icon{font-size:1.2rem;flex-shrink:0}
.qt-input{flex:1;padding:10px 12px;border:2px solid var(--border);border-radius:10px;font-size:.95rem;background:var(--card-bg);color:var(--text);outline:none;transition:var(--transition);font-family:inherit;min-width:0}
.qt-input:focus{border-color:var(--primary)}
.qt-go-btn{padding:10px 18px;background:var(--primary);color:#fff;border:none;border-radius:10px;cursor:pointer;font-size:.9rem;font-weight:600;white-space:nowrap;transition:var(--transition);font-family:inherit}
.qt-go-btn:hover{background:var(--primary-hover)}
.qt-result{margin-top:12px;padding:16px;background:rgba(79,70,229,.04);border-radius:10px;border:1px solid var(--border);animation:fc-fadeIn .25s ease}
.qt-result .qt-word{font-size:1.4rem;font-weight:700;color:var(--primary);margin-bottom:4px}
.qt-result .qt-phonetic{font-size:.9rem;color:var(--text-secondary);margin-bottom:8px}
.qt-result .qt-meanings{font-size:.9rem;line-height:1.7;margin-bottom:8px}
.qt-result .qt-meaning-item{padding:2px 0}
.qt-result .qt-pos{font-weight:600;color:var(--warning);margin-right:6px}
.qt-result .qt-example{font-size:.85rem;color:var(--text-secondary);font-style:italic;margin:4px 0;padding-left:8px;border-left:2px solid var(--border)}
.qt-result .qt-actions{display:flex;gap:8px;margin-top:10px;flex-wrap:wrap}
.qt-result .qt-empty{text-align:center;color:var(--text-secondary);padding:8px;font-size:.85rem}
.qt-history{display:flex;gap:6px;flex-wrap:wrap;margin-top:6px}
.qt-history-tag{font-size:.75rem;padding:3px 10px;border-radius:12px;background:var(--border);color:var(--text-secondary);cursor:pointer;transition:var(--transition);white-space:nowrap}
.qt-history-tag:hover{background:var(--primary);color:#fff}

/* === Privacy Policy === */
.privacy-check{margin:6px 0}
.privacy-label{display:flex;align-items:flex-start;gap:8px;font-size:.8rem;color:var(--text-secondary);cursor:pointer;user-select:none;line-height:1.5}
.privacy-label input[type="checkbox"]{margin-top:2px;width:16px;height:16px;accent-color:var(--primary);cursor:pointer;flex-shrink:0}
.privacy-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.5);z-index:300;display:flex;align-items:center;justify-content:center;padding:20px;animation:fadeIn .2s}
.privacy-modal{background:var(--card-bg);border-radius:var(--radius);max-width:560px;width:100%;max-height:80vh;overflow-y:auto;padding:24px;box-shadow:0 8px 40px rgba(0,0,0,.2);animation:slideUp .25s ease}
.privacy-content{font-size:.85rem;line-height:1.8;color:var(--text)}
.privacy-content h3{font-size:1rem;margin:16px 0 8px;color:var(--primary)}
.privacy-content p{margin:4px 0;color:var(--text-secondary)}

/* === Community === */
.cm-textarea{width:100%;padding:10px 14px;border:2px solid var(--border);border-radius:10px;font-size:.9rem;background:var(--card-bg);color:var(--text);outline:none;resize:vertical;font-family:inherit;transition:var(--transition);min-height:48px}
.cm-textarea:focus{border-color:var(--primary)}
.cm-cat-select{padding:6px 10px;border:1px solid var(--border);border-radius:8px;background:var(--card-bg);color:var(--text);font-size:.8rem;font-family:inherit}
.cm-tag-input{flex:1;min-width:80px;padding:6px 10px;border:1px solid var(--border);border-radius:8px;background:var(--card-bg);color:var(--text);font-size:.8rem;font-family:inherit}
.cm-avatar{width:40px;height:40px;border-radius:50%;background:var(--bg);display:flex;align-items:center;justify-content:center;font-size:1.2rem;overflow:hidden;flex-shrink:0}
.cm-avatar img{width:100%;height:100%;object-fit:cover}
.cm-avatar-sm{width:28px;height:28px;border-radius:50%;background:var(--bg);display:inline-flex;align-items:center;justify-content:center;font-size:.9rem;overflow:hidden;flex-shrink:0}
.cm-avatar-sm img{width:100%;height:100%;object-fit:cover}
.cm-categories{display:flex;gap:6px;overflow-x:auto;padding:8px 0;margin-bottom:4px;scrollbar-width:none}
.cm-categories::-webkit-scrollbar{display:none}
.cm-cat-tab{padding:6px 14px;border-radius:18px;border:1px solid var(--border);background:var(--card-bg);color:var(--text);cursor:pointer;font-size:.78rem;white-space:nowrap;font-family:inherit;transition:var(--transition);flex-shrink:0}
.cm-cat-tab:hover{border-color:var(--primary)}
.cm-cat-tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.cm-post{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius);padding:16px;margin-bottom:12px;box-shadow:var(--shadow);transition:transform .15s}
.cm-post:active{transform:scale(.99)}
.cm-post-header{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.cm-post-author{font-weight:600;font-size:.9rem;cursor:pointer}
.cm-post-rank{font-size:.7rem;color:var(--text-secondary)}
.cm-post-time{font-size:.7rem;color:var(--text-secondary);margin-left:auto}
.cm-post-title{font-weight:700;font-size:1rem;margin-bottom:6px;cursor:pointer}
.cm-post-title:hover{color:var(--primary)}
.cm-post-body{font-size:.9rem;line-height:1.6;margin-bottom:10px;word-break:break-word;white-space:pre-wrap}
.cm-post-image{width:100%;max-height:300px;object-fit:cover;border-radius:8px;margin-bottom:10px;cursor:pointer}
.cm-post-tags{display:flex;gap:4px;flex-wrap:wrap;margin-bottom:8px}
.cm-tag{font-size:.7rem;padding:2px 8px;border-radius:10px;background:rgba(79,70,229,.08);color:var(--primary)}
.cm-post-actions{display:flex;gap:16px;align-items:center;padding-top:8px;border-top:1px solid var(--border)}
.cm-action-btn{display:inline-flex;align-items:center;gap:4px;padding:4px 8px;border:none;background:none;color:var(--text-secondary);cursor:pointer;font-size:.82rem;border-radius:6px;transition:all .15s;font-family:inherit}
.cm-action-btn:hover{background:var(--border)}
.cm-action-btn.liked{color:#ef4444}
.cm-action-btn.bookmarked{color:#f59e0b}
.cm-comments{margin-top:10px;padding-top:10px;border-top:1px solid var(--border)}
.cm-comment{display:flex;gap:8px;padding:8px 0;border-bottom:1px solid var(--border)}
.cm-comment:last-child{border-bottom:none}
.cm-comment-body{flex:1;min-width:0}
.cm-comment-author{font-weight:600;font-size:.8rem}
.cm-comment-text{font-size:.85rem;color:var(--text);margin-top:2px;word-break:break-word}
.cm-comment-time{font-size:.7rem;color:var(--text-secondary);margin-top:2px}
.cm-comment-input{display:flex;gap:8px;margin-top:8px}
.cm-comment-input input{flex:1;padding:8px 12px;border:1px solid var(--border);border-radius:8px;font-size:.85rem;background:var(--card-bg);color:var(--text);outline:none;font-family:inherit}
.cm-comment-input input:focus{border-color:var(--primary)}
.cm-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.4);z-index:200;display:flex;align-items:flex-start;justify-content:center;padding:20px;overflow-y:auto;animation:fadeIn .2s}
.cm-detail-card{background:var(--card-bg);border-radius:var(--radius);max-width:600px;width:100%;margin-top:40px;padding:20px;max-height:80vh;overflow-y:auto;animation:slideUp .25s ease}
.cm-detail-close{float:right;background:none;border:none;font-size:1.3rem;cursor:pointer;color:var(--text-secondary);padding:4px 8px}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
@keyframes slideUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
.cm-empty{text-align:center;padding:40px 20px;color:var(--text-secondary)}
.cm-empty .icon{font-size:3rem;margin-bottom:10px}

/* === Responsive === */
@media(max-width:600px){
  .container{padding:10px}.header h1{font-size:1.15rem}
  .dictation-card .chinese-word{font-size:1.6rem}
  .letter-cell{width:32px;height:40px;font-size:1.1rem}
  .letter-grid{gap:3px}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .action-buttons{flex-direction:column}.action-buttons .btn{width:100%}
  .score-circle{width:100px;height:100px}.score-circle .score-num{font-size:1.8rem}
  .result-stats{gap:16px}
}

:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --text: #1e293b;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --shadow: 0 1px 3px rgba(0,0,0,0.1);
  --radius: 12px;
  --transition: all 0.2s ease;
}

[data-theme="dark"] {
  --bg: #0f172a;
  --card-bg: #1e293b;
  --text: #f1f5f9;
  --text-secondary: #94a3b8;
  --border: #334155;
  --shadow: 0 1px 3px rgba(0,0,0,0.3);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

.container { max-width: 800px; margin: 0 auto; padding: 16px; }

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
}

.header h1 {
  font-size: 1.5rem;
  background: linear-gradient(135deg, #4f46e5, #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-actions { display: flex; gap: 8px; }

.theme-btn, .back-btn {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
  color: var(--text);
  font-size: 1rem;
  transition: var(--transition);
}

.theme-btn:hover, .back-btn:hover { background: var(--border); }

/* Cards */
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
}

.card h2 { font-size: 1.1rem; margin-bottom: 12px; }

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}

.stat-card {
  text-align: center;
  padding: 16px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.stat-card .value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
}

.stat-card .label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
  text-decoration: none;
}

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); }
.btn-success { background: var(--success); color: white; }
.btn-success:hover { filter: brightness(1.1); }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { filter: brightness(1.1); }
.btn-outline {
  background: transparent;
  border: 2px solid var(--border);
  color: var(--text);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-lg { padding: 14px 28px; font-size: 1.1rem; border-radius: 12px; }
.btn-block { width: 100%; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-sm { padding: 6px 12px; font-size: 0.85rem; }

/* Word Bank */
.wordbank-list { display: grid; gap: 10px; }

.wordbank-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--card-bg);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
  user-select: none;
}

.wordbank-item:hover { border-color: var(--primary); }
.wordbank-item.selected {
  border-color: var(--primary);
  background: rgba(79, 70, 229, 0.05);
}

.wordbank-item .checkbox {
  width: 22px;
  height: 22px;
  border: 2px solid var(--border);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: var(--transition);
}

.wordbank-item.selected .checkbox {
  background: var(--primary);
  border-color: var(--primary);
}

.wordbank-item.selected .checkbox::after {
  content: "✓";
  color: white;
  font-size: 14px;
  font-weight: bold;
}

.wordbank-info { flex: 1; }
.wordbank-info .name { font-weight: 600; }
.wordbank-info .count { font-size: 0.8rem; color: var(--text-secondary); }

.option-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 12px 0;
}

.option-row label { font-weight: 500; }
.option-row select, .option-row input {
  padding: 8px 12px;
  border: 2px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  color: var(--text);
  font-size: 0.95rem;
}

.option-row input[type="number"] { width: 80px; }

/* Dictation Page */
.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--border);
  border-radius: 4px;
  margin-bottom: 8px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), #7c3aed);
  border-radius: 4px;
  transition: width 0.3s ease;
}

.progress-info {
  display: flex;
  justify-content: space-between;
  margin-bottom: 20px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.dictation-card {
  text-align: center;
  padding: 30px 20px;
}

.dictation-card .chinese-word {
  font-size: 2.8rem;
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.3;
}

.dictation-card .phonetic {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.dictation-card .example {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-style: italic;
  margin-bottom: 24px;
  opacity: 0.8;
}

.audio-btn {
  background: var(--card-bg);
  border: 2px solid var(--border);
  border-radius: 50%;
  width: 48px;
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.3rem;
  transition: var(--transition);
  margin-bottom: 20px;
}

.audio-btn:hover { border-color: var(--primary); color: var(--primary); }

.input-row {
  display: flex;
  gap: 10px;
  max-width: 420px;
  margin: 0 auto;
  align-items: center;
}

.input-row input {
  flex: 1;
  padding: 14px 18px;
  border: 3px solid var(--border);
  border-radius: 10px;
  font-size: 1.2rem;
  background: var(--card-bg);
  color: var(--text);
  outline: none;
  transition: var(--transition);
  font-family: inherit;
}

.input-row input:focus { border-color: var(--primary); }
.input-row input.correct {
  border-color: var(--success);
  background: rgba(16, 185, 129, 0.05);
}
.input-row input.wrong {
  border-color: var(--danger);
  background: rgba(239, 68, 68, 0.05);
  animation: shake 0.5s;
}

.action-buttons {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-top: 16px;
  flex-wrap: wrap;
}

.keyboard-hints {
  margin-top: 20px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.keyboard-hints kbd {
  background: var(--border);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: monospace;
  font-size: 0.8rem;
  border: 1px solid var(--text-secondary);
}

/* Result display */
.result-display {
  margin-top: 16px;
  padding: 16px;
  border-radius: var(--radius);
  text-align: center;
}

.result-display.correct-answer {
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid var(--success);
}

.result-display.wrong-answer {
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid var(--danger);
}

.result-display .answer-icon { font-size: 2rem; margin-bottom: 4px; }
.result-display .answer-label { font-weight: 600; margin-bottom: 4px; }
.result-display .correct-spelling {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--success);
  letter-spacing: 2px;
}
.result-display .user-input-display { font-size: 1.1rem; margin-top: 4px; }
.result-display .char-correct { color: var(--success); }
.result-display .char-wrong { color: var(--danger); text-decoration: underline; }

/* Results Page */
.score-circle {
  width: 130px;
  height: 130px;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  border: 8px solid;
}

.score-circle .score-num {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1;
}

.score-circle .score-label {
  font-size: 0.8rem;
  margin-top: 2px;
}

.score-excellent { border-color: var(--success); color: var(--success); }
.score-good { border-color: var(--primary); color: var(--primary); }
.score-fair { border-color: var(--warning); color: var(--warning); }
.score-poor { border-color: var(--danger); color: var(--danger); }

.result-stats {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin: 16px 0;
}

.result-stat {
  text-align: center;
}

.result-stat .num { font-size: 1.5rem; font-weight: 700; }
.result-stat .lbl { font-size: 0.8rem; color: var(--text-secondary); }

.error-list { max-height: 400px; overflow-y: auto; }

.error-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px;
  border-bottom: 1px solid var(--border);
  gap: 10px;
  flex-wrap: wrap;
}

.error-item .wrong-word {
  color: var(--danger);
  text-decoration: line-through;
  font-size: 0.95rem;
}

.error-item .arrow { color: var(--text-secondary); }
.error-item .correct-word {
  color: var(--success);
  font-weight: 600;
  font-size: 1rem;
}

.error-item .chinese-meaning {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

/* Chart */
.chart-container {
  height: 200px;
  display: flex;
  align-items: flex-end;
  gap: 10px;
  padding: 20px 0 30px;
}

.chart-bar {
  flex: 1;
  background: linear-gradient(180deg, var(--primary), #7c3aed);
  border-radius: 6px 6px 0 0;
  min-height: 4px;
  position: relative;
  transition: height 0.5s ease;
}

.chart-bar .bar-label {
  position: absolute;
  bottom: -24px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.7rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

.chart-bar .bar-value {
  position: absolute;
  top: -20px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.75rem;
  font-weight: 600;
}

/* Error Book */
.error-book-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 8px;
}

.error-book-stats { color: var(--text-secondary); font-size: 0.9rem; }

.error-book-item {
  display: flex;
  align-items: center;
  padding: 14px;
  border-bottom: 1px solid var(--border);
  gap: 12px;
  flex-wrap: wrap;
}

.error-book-item .word-main {
  font-size: 1.1rem;
  font-weight: 600;
}

.error-book-item .word-chinese {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.error-book-item .error-count {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-secondary);
}

.empty-state .icon { font-size: 4rem; margin-bottom: 16px; }
.empty-state h3 { margin-bottom: 8px; color: var(--text); }

/* Animations */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  75% { transform: translateX(6px); }
}

@keyframes flash-green {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
  70% { box-shadow: 0 0 0 15px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.flash-correct { animation: flash-green 0.6s ease; }
.text-center { text-align: center; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }

/* Page visibility */
.page { display: none; }
.page.active { display: block; }

/* Hint text */
.hint-text {
  font-size: 1.4rem;
  letter-spacing: 5px;
  font-weight: 600;
  color: var(--warning);
  margin: 12px 0;
  font-family: monospace;
}

/* Mode badge */
.mode-badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
}

.mode-normal { background: rgba(79, 70, 229, 0.1); color: var(--primary); }
.mode-review { background: rgba(245, 158, 11, 0.1); color: var(--warning); }

/* Responsive */
@media (max-width: 600px) {
  .container { padding: 10px; }
  .header h1 { font-size: 1.2rem; }
  .dictation-card .chinese-word { font-size: 1.8rem; }
  .input-row { flex-direction: column; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .action-buttons { flex-direction: column; }
  .action-buttons .btn { width: 100%; }
  .score-circle { width: 100px; height: 100px; }
  .score-circle .score-num { font-size: 2rem; }
  .result-stats { gap: 16px; }
  .mode-grid{grid-template-columns:repeat(3,1fr);gap:6px}
  .mode-card{padding:10px 6px}
  .mode-card .mode-icon{font-size:1.3rem}
  .mode-card .mode-name{font-size:.7rem}
  .choice-grid{grid-template-columns:1fr}
  .profile-cover-wrap{height:170px}
  .profile-avatar{width:76px;height:76px;font-size:2rem}
  .profile-avatar-wrap{margin-top:-38px}
  .fc-card{min-height:240px;padding:24px 16px}
  .fc-word-lg{font-size:2rem}
  .fc-full-word{font-size:1.5rem}
  .fc-full-meaning{font-size:1.2rem}
  .fc-btn{padding:12px 8px;font-size:.82rem}
}