:root{--bg:#101318;--card-bg:#1a1d23;--card-bg-hover:#23272f;--text-main:#e3e5e8;--text-dim:#8f96a3;--accent:#f4a825;--accent-soft:#f4a8251a;--accent-border:#f4a8254d;--success:#22c35d;--error:#d92626;--border:#2b303b;--font-sans:system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;--font-serif:"STZhongsong", "SimSun", "PingFang SC", serif;--container-max-width:600px;--safe-area-inset-bottom:env(safe-area-inset-bottom,0px)}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;margin:0;padding:0}body{background-color:var(--bg);color:var(--text-main);font-family:var(--font-sans);min-height:100dvh;line-height:1.6;overflow-x:hidden}#app{max-width:var(--container-max-width);flex-direction:column;min-height:100dvh;margin:0 auto;padding:20px;display:flex;position:relative}h1,h2,h3{color:var(--text-main);font-weight:700}.guwen-text{font-family:var(--font-serif);letter-spacing:.05em;font-size:1.5rem}.app-header{text-align:center;margin-bottom:2rem}.app-header h1{background:linear-gradient(135deg, var(--accent), #ffd966);-webkit-text-fill-color:transparent;-webkit-background-clip:text;font-size:1.8rem}.category-tabs{background:var(--card-bg);border:1px solid var(--border);border-radius:12px;margin-bottom:1.5rem;padding:4px;display:flex}.category-tabs .tab{text-align:center;cursor:pointer;color:var(--text-dim);border-radius:8px;flex:1;padding:8px;font-size:.9rem;font-weight:500;transition:all .2s}.category-tabs .tab.active{background:var(--accent);color:#181001}.poem-card{background:var(--card-bg);border:1px solid var(--border);cursor:pointer;border-radius:16px;justify-content:space-between;align-items:center;margin-bottom:1rem;padding:1.25rem;transition:all .2s cubic-bezier(.4,0,.2,1);display:flex}.poem-card:hover{background:var(--card-bg-hover);border-color:var(--accent-border);transform:translateY(-2px)}.poem-info h3{margin-bottom:.25rem;font-size:1.2rem}.poem-meta{color:var(--text-dim);font-size:.85rem}.poem-progress{width:48px;height:48px;position:relative}.flashcard-view{flex-direction:column;flex:1;gap:1.5rem;display:flex}.card-container{perspective:1000px;aspect-ratio:3/4;width:100%;max-height:500px}.card-inner{width:100%;height:100%;transform-style:preserve-3d;cursor:pointer;transition:transform .6s cubic-bezier(.4,0,.2,1);position:relative}.card-inner.flipped{transform:rotateY(180deg)}.card-face{backface-visibility:hidden;background:var(--card-bg);border:1px solid var(--border);text-align:center;border-radius:24px;flex-direction:column;justify-content:center;align-items:center;width:100%;height:100%;padding:2.5rem;display:flex;position:absolute;box-shadow:0 10px 30px #0000004d}.card-back{background:linear-gradient(135deg, var(--card-bg), #111317);transform:rotateY(180deg)}.card-face .text{font-size:1.8rem;line-height:1.5}.card-face 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1fr;gap:1rem;display:grid}.btn{cursor:pointer;border:none;border-radius:12px;justify-content:center;align-items:center;gap:.5rem;padding:1rem;font-size:1rem;font-weight:600;transition:all .2s;display:flex}.btn-primary{background:var(--accent);color:#181001}.btn-secondary{background:var(--card-bg);color:var(--text-main);border:1px solid var(--border)}.btn-success{background:var(--success);color:#fff}.btn-error{background:var(--error);color:#fff}.btn:active{transform:scale(.96)}@keyframes pulse{0%{opacity:1;transform:scale(1)}50%{opacity:.8;transform:scale(1.1)}to{opacity:1;transform:scale(1)}}.audio-playing{color:var(--accent);animation:1.5s ease-in-out infinite pulse}.hidden{display:none}.keyword-highlight{color:var(--accent);border-bottom:2px dashed var(--accent-border);cursor:help;padding-bottom:1px;transition:all .2s}.keyword-highlight:hover{background:var(--accent-soft);border-radius:2px}.kw-tooltip{animation:.2s ease-out tooltipIn}@keyframes tooltipIn{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.mastered-seal{color:#d32f2f;width:42px;height:42px;font-family:var(--font-serif);text-align:center;opacity:.8;pointer-events:none;text-shadow:0 0 1px #d32f2f33;z-index:5;-webkit-user-select:none;user-select:none;border:2px solid #d32f2f;border-radius:4px;justify-content:center;align-items:center;padding:4px;font-size:.85rem;font-weight:700;line-height:1.1;animation:.4s cubic-bezier(.175,.885,.32,1.275) stampIn;display:flex;position:absolute;top:10px;right:60px;transform:rotate(-15deg);box-shadow:inset 0 0 2px #d32f2f}@keyframes stampIn{0%{opacity:0;transform:scale(3)rotate(0)}to{opacity:.8;transform:scale(1)rotate(-15deg)}}@media 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#4682b4;box-shadow:0 0 4px #4169e166}.reward-popup-overlay{-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);z-index:1000;background:#000000bf;justify-content:center;align-items:center;padding:20px;animation:.3s fadeIn;display:flex;position:fixed;inset:0}.btn-eggy-rainbow-btn{cursor:pointer;z-index:10;align-items:center;gap:4px;display:flex;color:#fff!important;text-shadow:0 2px 4px #00000080!important;background:linear-gradient(90deg,#ff5f6d,#ffc371,#fffb00,#48ff00,#00ffd5,#002bff,#7a00ff,#ff00c8,#ff5f6d) 0 0/400% 100%!important;border:none!important;border-radius:16px!important;padding:6px 14px!important;font-size:.75rem!important;font-weight:900!important;transition:all .2s cubic-bezier(.175,.885,.32,1.275)!important;animation:8s linear infinite eggyRainbowFlow!important;box-shadow:0 4px #b32a2a,0 8px 20px #ff5f6d59!important}.btn-eggy-rainbow-btn:hover{transform:scale(1.08)translateY(-2px)!important;box-shadow:0 6px #b32a2a,0 12px 28px #ff5f6d80!important}.btn-eggy-rainbow-btn:active{transform:scale(.95)translateY(4px)!important;box-shadow:0 0 #b32a2a,0 4px 10px #ff5f6d33!important}@keyframes eggyRainbowFlow{0%{background-position:0%}to{background-position:400%}}@media (width<=580px){.checkin-banner{border-radius:14px!important;margin-bottom:.6rem!important;padding:4px 8px!important}.checkin-banner__container,.checkin-banner__row{gap:6px!important}.checkin-banner__streak-icon{font-size:1.05rem!important}.checkin-banner__streak-text{font-size:.72rem!important}#btn-checkin{border-radius:6px!important;height:20px!important;padding:2px 6px!important;font-size:.62rem!important}.reward-info__label{font-size:.68rem!important}.reward-info__grid{gap:4px!important}.reward-info__grid .reward-badge-wrapper{border-radius:8px!important;width:28px!important;height:28px!important}.reward-info__grid .reward-badge-wrapper>div{border-radius:6px!important;width:24px!important;height:24px!important}.reward-info__grid 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