:root{--bg: #F5F7FA;--panel: #FFFFFF;--border: #E4E7EC;--border-strong: #D0D5DD;--text: #1F2937;--text-soft: #475467;--text-mute: #98A2B3;--primary: #E23E57;--primary-hover: #C52E45;--primary-soft: #FFE8EC;--hit: #10B981;--hit-soft: #D1FAE5;--warn: #F59E0B;--warn-soft: #FEF3C7;--info: #3B82F6;--info-soft: #DBEAFE;--shadow-card: 0 1px 2px rgba(16,24,40,.04), 0 1px 3px rgba(16,24,40,.06);--shadow-hover: 0 4px 12px rgba(16,24,40,.08);--radius: 10px;--radius-sm: 6px;--c-f0: #1F2937;--c-f1: #E23E57;--c-f2: #3B82F6;--c-f3: #10B981;--c-f4: #F59E0B;--font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;--font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Consolas, Menlo, monospace}*{box-sizing:border-box}html,body{margin:0;padding:0}body{font-family:var(--font-sans);color:var(--text);background:var(--bg);min-height:100vh;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:14px;line-height:1.5}#app{display:flex;flex-direction:column;min-height:100vh}.toolbar{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:12px 24px;background:var(--panel);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:20}.toolbar-brand{display:flex;align-items:center;gap:8px}.toolbar-brand .logo{width:50px;height:50px;object-fit:contain}.toolbar-brand .title{font-size:18px;font-weight:700;letter-spacing:.2px}.toolbar-brand .subtitle{font-size:13px;color:var(--text-mute);font-weight:500}.toolbar-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.btn{display:inline-flex;align-items:center;gap:6px;height:36px;padding:0 14px;border:1px solid var(--border-strong);border-radius:var(--radius-sm);background:var(--panel);color:var(--text);font-size:14px;font-weight:500;font-family:inherit;cursor:pointer;transition:background .15s ease,border-color .15s ease,color .15s ease,transform .05s ease;white-space:nowrap}.btn:hover{background:#f9fafb}.btn:active{transform:translateY(1px)}.btn:focus-visible{outline:2px solid var(--info);outline-offset:2px}.btn-icon{font-size:14px;line-height:1}.btn-primary{background:var(--primary);border-color:var(--primary);color:#fff;font-weight:600}.btn-primary:hover{background:var(--primary-hover);border-color:var(--primary-hover)}.btn-primary.is-recording{background:var(--primary);border-color:var(--primary);box-shadow:0 0 0 4px #e23e5726;animation:pulse 1.6s ease-in-out infinite}@keyframes pulse{0%,to{box-shadow:0 0 0 4px #e23e5726}50%{box-shadow:0 0 0 8px #e23e5714}}.btn-ghost{background:var(--panel);border-color:var(--border-strong);color:var(--text-soft)}.btn-ghost:hover{background:#f9fafb;color:var(--text)}.btn:disabled{opacity:.4;cursor:not-allowed;transform:none}.btn:disabled:hover{background:var(--panel);color:var(--text-soft)}.help-bar{display:flex;align-items:center;gap:10px;padding:10px 24px;background:var(--warn-soft);border-left:4px solid var(--warn);color:#92400e;font-size:13px}.help-bar-icon{font-size:16px;line-height:1}.help-bar-text{flex:1}.help-bar-close{background:transparent;border:none;font-size:18px;line-height:1;color:#92400e;cursor:pointer;padding:2px 6px;border-radius:4px}.help-bar-close:hover{background:#0000000d}.preset-bar{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:14px;box-shadow:var(--shadow-card);display:flex;flex-direction:column;gap:14px;position:absolute;top:16px;right:calc(50% + 466px);width:220px;max-height:calc(100vh - 88px);overflow-y:auto}.preset-row{display:flex;flex-direction:column;align-items:stretch;gap:8px}.preset-label{font-size:12px;color:var(--text-soft);font-weight:600;letter-spacing:.3px}.preset-vowels{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;border-top:1px dashed var(--border);padding-top:12px}.vowel-btn{height:28px;padding:0 6px;font-size:12px;font-weight:600;color:var(--text);background:#fff;border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;transition:all .15s ease;font-family:var(--font-sans)}.vowel-btn:hover{background:#f9fafb;border-color:var(--border-strong)}.vowel-btn.is-active{background:var(--primary-soft);border-color:var(--primary);color:var(--primary)}.vowel-btn:focus-visible{outline:2px solid var(--info);outline-offset:1px}.preset-inputs{display:flex;flex-direction:column;gap:8px;border-top:1px dashed var(--border);padding-top:12px}.band-input{display:flex;align-items:center;gap:6px;background:#fff;border:1px solid var(--border);border-radius:var(--radius-sm);padding:5px 8px}.band-input[data-band=f0]{border-left:3px solid var(--hit)}.band-input[data-band=f1]{border-left:3px solid var(--info)}.band-input[data-band=f2]{border-left:3px solid var(--warn)}.band-key{font-size:11px;font-weight:700;color:var(--text-soft);min-width:20px}.band-lo,.band-hi{flex:1;min-width:0;height:22px;border:none;background:transparent;font-size:12px;font-family:var(--font-mono);color:var(--text);text-align:center;outline:none;border-radius:3px;padding:0 2px}.band-lo:focus,.band-hi:focus{background:#f4f7fb;box-shadow:inset 0 0 0 1px var(--info)}.band-dash{font-size:10px;color:var(--text-mute)}.band-unit{font-size:10px;color:var(--text-mute);margin-left:2px;min-width:18px}.content{flex:1;position:relative;padding:16px 20px;width:100%}.charts-column{display:flex;flex-direction:column;gap:12px;min-width:0;max-width:900px;width:100%;margin:0 auto}.charts-column .card{margin:0}.card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-card);display:flex;flex-direction:column;overflow:hidden;min-height:0;flex:1}.card-title{margin:0;font-size:14px;font-weight:700;color:var(--text);line-height:1;white-space:nowrap}.chart-wrapper{position:relative;display:flex;flex-direction:column;gap:8px;width:calc(100% - 20px);height:min(42vh,420px);min-height:280px;background:#fafbfc;border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden;margin:10px;padding:8px 10px}.chart-header{display:flex;flex-direction:column;gap:6px}.chart-header .card-title{font-size:14px;margin:0}.chart-area{position:relative;flex:1 1 auto;min-height:120px;overflow:hidden}#f0Chart,#formantChart{width:100%;height:100%;display:block}.empty-state{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;color:var(--text-mute);pointer-events:none;text-align:center;padding:0 16px}.empty-state-title{font-size:15px;font-weight:600;color:var(--text-soft)}.empty-state-desc{font-size:13px}.empty-state.hidden{display:none}.card-legend{display:flex;flex-wrap:wrap;gap:6px}.legend-item{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border:1px solid var(--border);background:#f9fafb;border-radius:999px;font-size:12px;color:var(--text-soft);cursor:pointer;font-family:inherit;transition:opacity .15s ease,background .15s ease}.legend-item:hover{background:#f3f4f6}.legend-item[data-active=false]{opacity:.35}.legend-item i{width:8px;height:8px;border-radius:50%;display:inline-block}.drawer--left{justify-content:flex-start}.drawer--left .drawer-panel{box-shadow:8px 0 24px #1018281f;animation:slideLeft .2s ease}@keyframes slideLeft{0%{transform:translate(-20px);opacity:0}to{transform:translate(0);opacity:1}}.radio-group{display:flex;flex-direction:column;gap:8px}.radio-item{display:flex;align-items:center;gap:8px;padding:8px 12px;border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;transition:background .15s ease,border-color .15s ease}.radio-item:hover{background:#f9fafb;border-color:var(--border-strong)}.radio-item input[type=radio]{margin:0;accent-color:var(--primary)}.radio-item span{font-size:13px;color:var(--text)}.radio-item small{color:var(--text-mute);font-size:12px}.config-hint{font-size:12px;color:var(--text-mute);margin:8px 0 0}.drawer{position:fixed;top:0;right:0;bottom:0;left:0;z-index:40;display:flex;justify-content:flex-end}.drawer[hidden]{display:none}.drawer-mask{position:absolute;top:0;right:0;bottom:0;left:0;background:#10182859;animation:fade .2s ease}.drawer-panel{position:relative;width:min(460px,100%);height:100%;background:var(--panel);box-shadow:-8px 0 24px #1018281f;display:flex;flex-direction:column;animation:slide .2s ease}@keyframes fade{0%{opacity:0}to{opacity:1}}@keyframes slide{0%{transform:translate(20px);opacity:0}to{transform:translate(0);opacity:1}}.drawer-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border)}.drawer-header h3{margin:0;font-size:16px;font-weight:700}.drawer-close{background:transparent;border:none;font-size:22px;line-height:1;color:var(--text-mute);cursor:pointer;padding:4px 8px;border-radius:4px}.drawer-close:hover{background:#f3f4f6;color:var(--text)}.drawer-body{padding:16px 20px;overflow-y:auto;flex:1}.drawer-body section+section{margin-top:16px}.drawer-body h4{margin:0 0 4px;font-size:13px;font-weight:700;color:var(--text)}.drawer-body p,.drawer-body li{font-size:13px;color:var(--text-soft);margin:0}.drawer-body ul{margin:0;padding-left:18px}.drawer-body li{margin:2px 0}.ref-table{width:100%;border-collapse:collapse;font-size:11px;margin-top:4px}.ref-table th,.ref-table td{border:1px solid #E5E7EB;padding:3px 4px;text-align:center;white-space:nowrap}.ref-table th{background:#f9fafb;font-weight:600;color:var(--text)}.ref-table td{color:var(--text-soft)}@media (max-width: 768px){.toolbar{padding:10px 16px;gap:12px}.toolbar-brand .subtitle{display:none}.toolbar-brand .logo{width:30px;height:30px}.help-bar{padding:10px 16px;font-size:12px}.content{padding:14px}.preset-bar{position:static;width:100%;max-height:none;overflow:visible;margin-bottom:14px}.preset-vowels{grid-template-columns:repeat(6,1fr)}.chart-wrapper{height:280px}.card-header,.card-body{padding-left:14px;padding-right:14px}.btn-label{display:none}.btn{height:38px;padding:0 12px}}@media (max-width: 540px){.toolbar-actions{width:100%;justify-content:flex-end}}