:root{--bg-primary: #070a12;--bg-secondary: #0d1222;--bg-tertiary: #131b31;--bg-card: rgba(18, 26, 47, .72);--bg-card-hover: rgba(26, 37, 65, .85);--bg-elevated: rgba(30, 42, 74, .65);--border-subtle: rgba(255, 255, 255, .08);--border-glow: rgba(6, 182, 212, .35);--border-focus: #06b6d4;--glass-blur: blur(16px);--glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, .37);--accent-cyan: #06b6d4;--accent-cyan-light: #67e8f9;--accent-cyan-glow: rgba(6, 182, 212, .25);--accent-purple: #8b5cf6;--accent-purple-light: #c084fc;--accent-purple-glow: rgba(139, 92, 246, .25);--accent-gradient: linear-gradient(135deg, #06b6d4 0%, #8b5cf6 50%, #ec4899 100%);--accent-gradient-cyan: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);--accent-gradient-gold: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);--status-good: #10b981;--status-good-bg: rgba(16, 185, 129, .15);--status-warning: #f59e0b;--status-warning-bg: rgba(245, 158, 11, .15);--status-error: #f43f5e;--status-error-bg: rgba(244, 63, 94, .15);--text-primary: #f8fafc;--text-secondary: #94a3b8;--text-muted: #64748b;--text-highlight: #38bdf8;--font-main: "Outfit", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-phonetic: "Fira Code", "Courier New", monospace;--radius-sm: 8px;--radius-md: 14px;--radius-lg: 20px;--radius-full: 9999px;--transition-fast: .18s cubic-bezier(.4, 0, .2, 1);--transition-smooth: .3s cubic-bezier(.4, 0, .2, 1);--transition-bounce: .5s cubic-bezier(.34, 1.56, .64, 1)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}html,body{width:100%;min-height:100%;background-color:var(--bg-primary);color:var(--text-primary);font-family:var(--font-main);font-size:16px;line-height:1.5;overflow-x:hidden;letter-spacing:-.01em}body{background-image:radial-gradient(circle at 15% 15%,rgba(6,182,212,.12) 0%,transparent 40%),radial-gradient(circle at 85% 25%,rgba(139,92,246,.14) 0%,transparent 45%),radial-gradient(circle at 50% 80%,rgba(59,130,246,.08) 0%,transparent 50%);background-attachment:fixed;padding-bottom:env(safe-area-inset-bottom,24px)}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:var(--bg-primary)}::-webkit-scrollbar-thumb{background:#ffffff2e;border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--accent-cyan)}.app-container{max-width:1280px;margin:0 auto;padding:16px 20px 80px;min-height:100vh;display:flex;flex-direction:column}@media(max-width:768px){.app-container{padding:12px 14px 90px}}.glass-panel{background:var(--bg-card);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);box-shadow:var(--glass-shadow);transition:all var(--transition-smooth)}.glass-panel:hover{border-color:#ffffff24}.glass-card-interactive{cursor:pointer;transition:transform var(--transition-fast),border-color var(--transition-fast),box-shadow var(--transition-fast)}.glass-card-interactive:hover{transform:translateY(-2px);border-color:var(--border-glow);box-shadow:0 12px 36px #06b6d426}.app-header{display:flex;align-items:center;justify-content:space-between;padding:14px 22px;margin-bottom:20px;position:sticky;top:12px;z-index:50;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);background:#0d1222d9;border:1px solid var(--border-subtle);border-radius:var(--radius-lg)}.logo-group{display:flex;align-items:center;gap:12px;cursor:pointer}.logo-icon-wrapper{width:42px;height:42px;border-radius:12px;background:var(--accent-gradient);display:flex;align-items:center;justify-content:center;box-shadow:0 0 20px var(--accent-cyan-glow);position:relative;overflow:hidden}.logo-title{font-size:1.28rem;font-weight:800;letter-spacing:-.03em;background:linear-gradient(135deg,#fff 30%,#94a3b8);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.logo-badge{font-size:.65rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;padding:2px 7px;border-radius:6px;background:var(--accent-cyan-glow);color:var(--accent-cyan-light);border:1px solid rgba(6,182,212,.3);margin-left:6px}.header-actions{display:flex;align-items:center;gap:10px}.stat-pill{display:flex;align-items:center;gap:6px;padding:7px 14px;border-radius:var(--radius-full);background:#ffffff0d;border:1px solid var(--border-subtle);font-size:.88rem;font-weight:600;color:var(--text-primary);cursor:pointer;transition:all var(--transition-fast)}.stat-pill:hover{background:#ffffff17;border-color:#ffffff2e}.stat-pill.streak{color:#fb923c;background:#fb923c1a;border-color:#fb923c40}.btn-primary{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:9px 18px;border-radius:var(--radius-md);background:var(--accent-gradient-cyan);color:#fff;font-weight:600;font-size:.9rem;border:none;cursor:pointer;box-shadow:0 4px 18px #06b6d459;transition:all var(--transition-fast)}.btn-primary:hover{filter:brightness(1.12);transform:translateY(-1px);box-shadow:0 6px 22px #06b6d480}.btn-primary:active{transform:translateY(1px)}.btn-secondary{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:8px 16px;border-radius:var(--radius-md);background:#ffffff0f;color:var(--text-primary);font-weight:600;font-size:.88rem;border:1px solid var(--border-subtle);cursor:pointer;transition:all var(--transition-fast)}.btn-secondary:hover{background:#ffffff1f;border-color:#fff3}.btn-icon{width:38px;height:38px;display:inline-flex;align-items:center;justify-content:center;border-radius:var(--radius-md);background:#ffffff0d;border:1px solid var(--border-subtle);color:var(--text-secondary);cursor:pointer;transition:all var(--transition-fast)}.btn-icon:hover{color:var(--text-primary);background:#ffffff1a;border-color:#fff3}.studio-grid{display:grid;grid-template-columns:340px 1fr;gap:20px;margin-top:8px}@media(max-width:1024px){.studio-grid{grid-template-columns:1fr}}.lesson-card{padding:14px 16px;border-radius:var(--radius-md);background:#ffffff08;border:1px solid transparent;margin-bottom:10px;cursor:pointer;transition:all var(--transition-fast)}.lesson-card:hover{background:#ffffff0f;border-color:#ffffff1a}.lesson-card.active{background:#06b6d41a;border-color:var(--accent-cyan);box-shadow:0 0 18px #06b6d42e}.waveform-section{padding:10px 14px;position:relative;overflow:hidden}.waveform-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}.track-label{display:flex;align-items:center;gap:6px;font-size:.76rem;font-weight:600;text-transform:uppercase;letter-spacing:.04em}.dot-indicator{width:6px;height:6px;border-radius:50%}.dot-native{background:var(--accent-cyan);box-shadow:0 0 6px var(--accent-cyan)}.dot-user{background:var(--accent-purple);box-shadow:0 0 6px var(--accent-purple)}.canvas-container{width:100%;height:30px;position:relative;background:#070a12cc;border-radius:6px;border:1px solid rgba(255,255,255,.06);overflow:hidden;margin-bottom:6px}.canvas-container:last-of-type{margin-bottom:4px}.canvas-container canvas{width:100%;height:100%;display:block}.subtitles-container{max-height:420px;overflow-y:auto;padding:8px 4px;display:flex;flex-direction:column;gap:12px}.sentence-item{padding:16px 20px;border-radius:var(--radius-md);background:#ffffff05;border:1px solid transparent;transition:all var(--transition-fast);cursor:pointer;position:relative}.sentence-item:hover{background:#ffffff0d}.sentence-item.active{background:linear-gradient(135deg,#06b6d41f,#8b5cf61f);border-color:#06b6d466;box-shadow:0 4px 20px #06b6d426}.sentence-index{position:absolute;top:12px;right:16px;font-size:.75rem;font-weight:700;color:var(--text-muted);font-family:var(--font-phonetic)}.sentence-english{font-size:1.18rem;font-weight:600;line-height:1.6;color:#fff;margin-bottom:6px;display:flex;flex-wrap:wrap;gap:6px}.clickable-word{display:inline-block;padding:1px 4px;border-radius:4px;transition:all .15s ease;position:relative}.clickable-word:hover{background:#06b6d440;color:var(--accent-cyan-light);transform:translateY(-1px)}.word-status-good{color:#34d399;border-bottom:2px solid #10b981}.word-status-warning{color:#fbbf24;border-bottom:2px solid #f59e0b}.word-status-error{color:#fb7185;border-bottom:2px solid #f43f5e}.sentence-ipa{font-family:var(--font-phonetic);font-size:.88rem;color:var(--accent-cyan-light);margin-bottom:6px;opacity:.88;letter-spacing:.03em}.sentence-chinese{font-size:.94rem;color:var(--text-secondary);line-height:1.5}.blind-mode-blur{filter:blur(8px);-webkit-user-select:none;user-select:none;transition:filter .3s ease}.blind-mode-blur:hover{filter:blur(0px)}.studio-deck{padding:18px 24px;margin-top:18px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;background:#0d1222f2}.record-btn-wrapper{position:relative;display:flex;align-items:center;justify-content:center}.record-btn{width:64px;height:64px;border-radius:50%;background:var(--status-error);color:#fff;border:4px solid rgba(244,63,94,.3);box-shadow:0 0 24px #f43f5e73;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all var(--transition-fast);position:relative}.record-btn:hover{transform:scale(1.06);box-shadow:0 0 32px #f43f5ea6}.record-btn.recording{background:#fff;color:var(--status-error);animation:pulse-ring 1.5s infinite}@keyframes pulse-ring{0%{box-shadow:0 0 #f43f5e99,0 0 20px #f43f5e80}70%{box-shadow:0 0 0 16px #f43f5e00,0 0 30px #f43f5ecc}to{box-shadow:0 0 #f43f5e00,0 0 20px #f43f5e80}}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#04070ec7;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);z-index:100;display:flex;align-items:center;justify-content:center;padding:16px;animation:fadeIn .2s ease}.modal-content{width:100%;max-width:520px;background:#0d1324;border:1px solid var(--border-glow);border-radius:var(--radius-lg);padding:26px;box-shadow:0 20px 50px #0009;position:relative;max-height:90vh;overflow-y:auto}@keyframes fadeIn{0%{opacity:0;transform:scale(.96)}to{opacity:1;transform:scale(1)}}.card-scene{perspective:1000px;width:100%;height:280px;margin:16px 0}.flashcard-3d{width:100%;height:100%;position:relative;transform-style:preserve-3d;transition:transform .6s cubic-bezier(.4,0,.2,1);cursor:pointer}.flashcard-3d.flipped{transform:rotateY(180deg)}.card-face{position:absolute;width:100%;height:100%;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:var(--radius-lg);padding:28px;display:flex;flex-direction:column;justify-content:space-between;border:1px solid var(--border-subtle);background:linear-gradient(135deg,#141d35e6,#0d1324f2);box-shadow:var(--glass-shadow)}.card-face-back{transform:rotateY(180deg);border-color:#8b5cf666}.mobile-nav-bar{display:none;position:fixed;bottom:0;left:0;right:0;height:64px;background:#0b101ef0;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-top:1px solid var(--border-subtle);z-index:60;padding:0 16px;padding-bottom:env(safe-area-inset-bottom,0px)}@media(max-width:768px){.mobile-nav-bar{display:flex;align-items:center;justify-content:space-around}}