*{box-sizing:border-box}body{margin:0;padding:0;overflow-x:hidden}#toggleBar{position:fixed;top:0;left:200;right:200px;z-index:10001;background:#1a3a5c;padding:10px 20px;display:flex;justify-content:space-between;align-items:center;box-shadow:0 2px 10px rgba(0,0,0,.3);height:60px}#toggleBar h3{color:#fff;margin:0;font-size:1.1rem;font-weight:500}#toggleBar .toggle-btn-group{display:flex;gap:10px;align-items:center}#toggleBar .toggle-btn-group button{background:hsla(0,0%,100%,.15);border:1px solid hsla(0,0%,100%,.2);color:#fff;padding:8px 20px;border-radius:8px;cursor:pointer;font-size:.9rem;font-weight:500;transition:all .3s ease;display:flex;align-items:center;gap:8px}#toggleBar .toggle-btn-group button:hover{background:hsla(0,0%,100%,.25);transform:translateY(-1px)}#toggleBar .toggle-btn-group button.active{background:#4caf50;border-color:#4caf50}#toggleBar .toggle-btn-group button i{font-size:1rem}.split-container{display:flex;min-height:100vh;margin-top:60px;position:relative}.left-panel,.split-container{width:100%;transition:all .4s ease}.left-panel{flex:1 1;overflow-y:auto;padding:20px;background:#f8fafc;height:calc(100vh - 60px)}.split-mode .left-panel{flex:0 0 50%;width:50%;padding-right:10px;border-right:3px solid #e0e8f0}.right-panel{flex:0 0;width:0;transition:all .4s ease;height:calc(100vh - 60px);position:relative}.right-panel,.split-mode .right-panel{overflow-y:auto;overflow-x:hidden;background:#fff}.split-mode .right-panel{flex:0 0 50%;width:50%;border-left:3px solid #e0e8f0}.right-panel.fullscreen-whiteboard{position:fixed;top:0;left:0;width:100vw!important;height:100vh!important;z-index:9999;flex:0 0 100%!important;border-left:none!important;border-radius:0!important;overflow-y:auto!important;background:#fff;margin:0!important;padding:0!important}.right-panel.fullscreen-whiteboard #whiteboardCanvas{width:100%}.split-container.whiteboard-fullscreen 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.range-wrap{display:flex;flex-direction:column;align-items:center;gap:2px;flex-shrink:0}#whiteboardToolbar #thickVal{font-size:.6rem;color:#2c3e50;font-weight:600}@media (max-width:768px){#toggleBar{display:none!important}.split-container{margin-top:0!important;display:block!important}.left-panel{flex:1 1!important;width:100%!important;height:auto!important;min-height:100vh!important;padding:12px!important;border-right:none!important}.right-panel{display:none!important;width:0!important;flex:0 1!important;height:0!important;overflow:hidden!important}.split-mode .left-panel{flex:1 1!important;width:100%!important;height:auto!important;min-height:100vh!important;border-right:none!important;border-bottom:none!important}.split-mode .right-panel{display:none!important;width:0!important;flex:0 1!important;height:0!important;overflow:hidden!important}.split-mode .split-container{flex-direction:column!important}#toolbarToggleBtn,#whiteboardCanvas,#whiteboardToolbar{display:none!important}.voice-header h1{font-size:2rem}.section-card{padding:1.2rem 1rem}.rule-box{padding:.8rem 1rem}.rule-formula{font-size:.9rem;padding:.4rem 1rem}}@media screen and (max-width:576px){body{padding-top:30px!important;padding-left:0!important;padding-right:0!important}.content-wrapper{padding:0!important;width:100vw!important;overflow-x:hidden}.signup-container{width:100%!important;max-width:100%!important;margin:0!important;padding:0!important}}.voice-header{background:linear-gradient(145deg,#f0f7ff,#e6f0fa);border-radius:24px;padding:1.8rem 2rem;margin-bottom:2.5rem;border-left:8px solid #0b5e9e;box-shadow:0 6px 16px rgba(0,40,80,.08)}.voice-header h1{font-size:2.6rem;font-weight:700;color:#0a4b7a;letter-spacing:-.3px;margin:0 0 .2rem}.voice-header p{font-size:1.15rem;color:#1f4970;margin:0;opacity:.9}.section-card{background:#fff;border-radius:20px;box-shadow:0 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#b9d3e9}.example-box{background:#f0f9f0;border-radius:14px;padding:.9rem 1.8rem;margin:.8rem 0 .6rem;border-left:5px solid #2b7a4b}.example-box ul{margin-bottom:.2rem}.example-box li{list-style-type:"✓ ";padding-left:6px;color:#154f2b}.badge-degree{background:#d4e3f0;color:#0d4c78;border-radius:40px;padding:.15rem 1.2rem;font-weight:600;font-size:.9rem;display:inline-block;letter-spacing:.3px}.tip-grid{display:flex;flex-wrap:wrap;gap:16px;margin-top:.6rem}.tip-item{background:#e9f1fa;padding:.6rem 1.4rem;border-radius:40px;font-weight:500;color:#0e4b75;border:1px solid #c4d9ec}.table-wrap{overflow-x:auto;margin:1.5rem 0;border-radius:18px;border:1px solid #dae6f0;color:#000}.table-wrap table{width:100%;border-collapse:collapse;font-size:.95rem}.table-wrap th{background:#dce8f3;color:#0a3c60;font-weight:700;padding:.9rem .8rem;text-align:center;border-bottom:2px solid #b0c9dd}.table-wrap td{padding:.9rem .8rem;border-bottom:1px solid #d4e0ec;vertical-align:top;background:#fff}.table-wrap tr:last-child td{border-bottom:none}.table-wrap td:first-child{font-weight:500;color:#004b7a}.footer-note{background:#e9f0f7;border-radius:40px;padding:.8rem 2rem;text-align:center;color:#1d4b71;font-weight:500;border:1px solid #c4d6e8;margin-top:2rem}hr.divider{border:1px solid #cbddee;margin:2rem 0 1.5rem;opacity:.5}@media (max-width:600px){.voice-header h1{font-size:2rem}.section-card{padding:1.2rem 1rem}.rule-box{padding:.8rem 1rem}.rule-formula{font-size:.9rem;padding:.4rem 1rem}}@media screen and (max-width:576px){body{padding-top:50px;padding-left:0!important;padding-right:0!important}.content-wrapper{padding:0!important;width:100vw!important;overflow-x:hidden}.signup-container{width:100%!important;max-width:100%!important;margin:0!important;padding:0!important}}.right-panel.fullscreen-whiteboard #whiteboardToolbar{position:fixed;top:10px;left:auto;right:60px;transform:none;background:hsla(0,0%,100%,.96);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);box-shadow:0 8px 28px rgba(0,0,0,.18);border-radius:40px;padding:0 10px;display:flex;flex-direction:row;align-items:center;gap:6px;border:1px solid hsla(0,0%,78%,.3);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;transition:all .3s ease;opacity:0;pointer-events:none;white-space:nowrap;flex-wrap:nowrap;z-index:10006}.right-panel.fullscreen-whiteboard #whiteboardToolbar:not(.toolbar-hidden){opacity:1;pointer-events:auto}.right-panel.fullscreen-whiteboard #whiteboardToolbar.toolbar-hidden{opacity:0;pointer-events:none;transform:translateY(-10px)}.right-panel.fullscreen-whiteboard #fullscreenToggleBtn{position:fixed;top:10px;right:10px;z-index:10007}.right-panel.fullscreen-whiteboard #toolbarToggleBtn,.right-panel.fullscreen-whiteboard~#toolbarToggleBtn{display:none!important}.right-panel.fullscreen-whiteboard #whiteboardCanvas{width:100vw;height:100vh;min-height:100vh;display:block}