@import"https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700&display=swap";:root{--color-bg: #0a0a0a;--color-surface: #1a1a1a;--color-surface-2: #262626;--color-surface-3: #0f0f0f;--color-border: #333;--color-border-strong: #444;--color-text: #e5e5e5;--color-text-dim: #999;--color-text-muted: #666;--color-accent: #39d353;--color-accent-dim: #2ecc71;--color-accent-deep: #229954;--color-accent-soft: rgba(57, 211, 83, .15);--color-accent-glow: rgba(57, 211, 83, .3);--color-accent-tint: rgba(57, 211, 83, .08);--color-warning: #ffc857;--color-warning-strong: #f39c12;--color-warning-orange: #ff9500;--color-danger: #ff5f5f;--color-danger-strong: #c0392b;--color-info: #5b9aff;--color-provisional: #ffc857;--color-on-accent: #fff;--font-mono: "JetBrains Mono", "Monaco", "Courier New", ui-monospace, monospace;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-pill: 999px;--shadow-soft: 0 4px 12px rgba(0, 0, 0, .3);--shadow-glow: 0 0 0 3px var(--color-accent-soft);--shadow-press: inset 0 2px 8px rgba(0, 0, 0, .5);--t-fast: .12s ease;--t-base: .2s cubic-bezier(.4, 0, .2, 1)}body{font-family:var(--font-mono);background:var(--color-bg);min-height:100vh;display:flex;justify-content:center;align-items:center;color:var(--color-text);padding:20px}#root{width:100%;max-width:1280px;height:calc(100vh - 40px)}button{cursor:pointer;border:1px solid transparent;border-radius:var(--radius-md);font-size:14px;font-weight:600;font-family:var(--font-mono);transition:background var(--t-base),border-color var(--t-base),transform var(--t-fast),box-shadow var(--t-base);background:var(--color-surface-2);color:var(--color-text);padding:10px 16px}button:hover{background:var(--color-border);border-color:var(--color-accent);box-shadow:0 4px 12px var(--color-accent-soft)}button:active{transform:translateY(0);background:var(--color-surface)}button:disabled{opacity:.4;cursor:not-allowed;transform:none;border-color:transparent;box-shadow:none}button:disabled:hover{background:var(--color-surface-2);border-color:transparent;box-shadow:none}input{border:1px solid var(--color-border);border-radius:var(--radius-md);padding:12px 16px;font-size:14px;font-family:var(--font-mono);outline:none;transition:border-color var(--t-base),background var(--t-base),box-shadow var(--t-base);background:var(--color-surface);color:var(--color-text)}input:focus{border-color:var(--color-accent);background:var(--color-surface-2);box-shadow:var(--shadow-glow)}@media(max-width:768px){body{padding:10px}#root{height:calc(100vh - 20px)}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;cursor:pointer;border:1px solid transparent;border-radius:var(--radius-md);font-family:var(--font-mono);font-weight:600;letter-spacing:.02em;transition:background var(--t-base),border-color var(--t-base),color var(--t-base),box-shadow var(--t-base),transform var(--t-fast);text-decoration:none;user-select:none;white-space:nowrap}.btn:focus-visible{outline:none;box-shadow:var(--shadow-glow)}.btn:disabled,.btn[aria-disabled=true]{opacity:.45;cursor:not-allowed;pointer-events:none}.btn--sm{font-size:12px;padding:6px 12px}.btn--md{font-size:14px;padding:10px 18px}.btn--lg{font-size:15px;padding:13px 22px}.btn--block{width:100%}.btn--primary{background:var(--color-accent);color:var(--color-bg);border-color:var(--color-accent)}.btn--primary:hover{background:var(--color-accent-dim);border-color:var(--color-accent-dim);box-shadow:0 4px 14px var(--color-accent-glow);transform:translateY(-1px)}.btn--primary:active{transform:translateY(0);background:var(--color-accent-deep);border-color:var(--color-accent-deep)}.btn--ghost{background:transparent;color:var(--color-text);border-color:var(--color-border-strong)}.btn--ghost:hover{background:var(--color-surface-2);border-color:var(--color-accent);color:var(--color-accent)}.btn--ghost:active{background:var(--color-surface)}.btn--danger{background:transparent;color:var(--color-danger);border-color:var(--color-danger)}.btn--danger:hover{background:#ff5f5f1a;color:var(--color-danger);border-color:var(--color-danger);box-shadow:0 4px 14px #ff5f5f33}.btn--danger:active{background:#ff5f5f2e}.btn--subtle{background:transparent;color:var(--color-text-dim);border-color:transparent}.btn--subtle:hover{background:var(--color-surface-2);color:var(--color-text)}.btn__icon{display:inline-flex;align-items:center;font-size:1em;line-height:1}.username-form-container{display:flex;justify-content:center;align-items:center;min-height:100vh}.username-card{background:var(--color-surface);border:1px solid var(--color-border);padding:40px;border-radius:16px;box-shadow:0 20px 60px #0009;text-align:center;max-width:400px;width:100%;backdrop-filter:blur(10px)}.login-logo{width:auto;height:165px;margin:0 auto 20px;filter:drop-shadow(0 0 20px rgba(57,211,83,.5));transition:filter .3s ease}.login-logo:hover{filter:drop-shadow(0 0 30px rgba(57,211,83,.7))}@media(max-width:768px){.login-logo{height:140px}}@media(max-width:480px){.login-logo{height:110px}.username-card{padding:30px 20px}}.username-card h1{font-size:2.5rem;margin-bottom:10px;color:var(--color-accent);font-family:Monaco,monospace}.subtitle{color:var(--color-text-dim);margin-bottom:30px;font-size:14px;font-family:Monaco,monospace}.username-card form{display:flex;flex-direction:column;gap:15px}.username-card input{width:100%}.online-users-badge{display:inline-flex;align-items:center;gap:6px;background:#39d3531a;border:1px solid rgba(57,211,83,.3);padding:6px 12px;border-radius:20px;font-size:12px;color:var(--color-accent);font-weight:600;margin-bottom:20px;font-family:Monaco,monospace}.online-dot{width:8px;height:8px;border-radius:50%;background:var(--color-accent);animation:pulse 2s ease-in-out infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.version-badge{margin-top:20px;padding:6px 12px;background:#ffffff0d;border:1px solid var(--color-border);border-radius:8px;font-size:10px;color:var(--color-text-muted);font-family:Monaco,monospace;font-weight:600}.mode-selector-page{width:100%;height:100%;overflow-y:auto;overflow-x:hidden;background:linear-gradient(135deg,var(--color-surface) 0%,var(--color-surface-3) 100%)}.mode-content{max-width:900px;margin:0 auto;padding:50px 20px;min-height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center}.mode-header{text-align:center;margin-bottom:60px;animation:fadeInDown .6s ease-out}@keyframes fadeInDown{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}.welcome-badge{display:inline-block;padding:6px 16px;background:var(--color-accent-soft);border:1px solid var(--color-accent-glow);border-radius:var(--radius-pill);color:var(--color-accent);font-size:12px;font-weight:700;font-family:var(--font-mono);text-transform:uppercase;letter-spacing:1px;margin-bottom:16px}.mode-header h1{color:var(--color-accent);font-size:42px;margin-bottom:16px;font-weight:700;text-shadow:0 2px 10px rgba(57,211,83,.3)}.mode-subtitle{color:var(--color-text-dim);font-size:18px;margin-bottom:24px}.mode-header p{color:var(--color-text-dim);font-size:17px;margin-bottom:20px;line-height:1.6;font-family:var(--font-mono)}.online-badge{display:inline-flex;align-items:center;gap:10px;padding:10px 20px;background:#39d35326;border:2px solid rgba(57,211,83,.4);border-radius:24px;color:var(--color-accent);font-size:15px;font-weight:600;box-shadow:0 4px 16px #39d35333;animation:pulse 2s ease-in-out infinite}@keyframes pulse{0%,to{transform:scale(1);box-shadow:0 4px 16px #39d35333}50%{transform:scale(1.02);box-shadow:0 6px 20px #39d3534d}}.online-dot{width:10px;height:10px;border-radius:50%;background:var(--color-accent);box-shadow:0 0 10px var(--color-accent);animation:blink 2s ease-in-out infinite}.mode-cards{display:flex;gap:30px;width:100%;max-width:800px;flex-wrap:wrap;justify-content:center}.mode-card{flex:1;min-width:320px;max-width:380px;background:linear-gradient(145deg,var(--color-surface-2),var(--color-surface));border:3px solid var(--color-border);border-radius:24px;padding:42px 32px;cursor:pointer;transition:all .4s cubic-bezier(.4,0,.2,1);text-align:center;position:relative;overflow:hidden}.mode-card:before{content:"";position:absolute;inset:0;background:linear-gradient(135deg,transparent 0%,rgba(255,255,255,.03) 100%);opacity:0;transition:opacity .4s ease}.mode-card:hover:before{opacity:1}.mode-card:hover{transform:translateY(-8px);box-shadow:0 16px 40px #0009}.chat-card{border-color:var(--color-accent)}.chat-card:hover{border-color:var(--color-accent-dim);box-shadow:0 16px 40px var(--color-accent-glow);background:linear-gradient(145deg,var(--color-surface-2),var(--color-surface))}.practice-card{border-color:var(--color-border-strong)}.practice-card:hover{border-color:var(--color-accent);box-shadow:0 16px 40px #00000080;background:linear-gradient(145deg,var(--color-surface-2),var(--color-surface))}.card-icon{font-size:64px;margin-bottom:24px;animation:float 3s ease-in-out infinite}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.mode-card h2{color:var(--color-text);font-size:28px;margin-bottom:14px;font-weight:700}.mode-card p{color:var(--color-text-dim);font-size:15px;line-height:1.7;margin-bottom:20px}.card-badge{display:inline-block;padding:6px 14px;background:var(--color-surface-2);border:1px solid var(--color-border-strong);border-radius:var(--radius-pill);color:var(--color-text-dim);font-size:12px;font-weight:600;font-family:var(--font-mono);text-transform:uppercase;letter-spacing:.5px}.card-badge.primary{background:var(--color-accent-soft);border-color:var(--color-accent-glow);color:var(--color-accent)}@media(max-width:768px){.mode-content{padding:32px 16px}.mode-header{margin-bottom:40px}.mode-header h1{font-size:32px}.mode-header p{font-size:15px}.welcome-badge{font-size:11px;padding:5px 12px}.online-badge{font-size:13px;padding:8px 16px}.mode-cards{flex-direction:column;gap:24px}.mode-card{min-width:100%;padding:36px 28px}.card-icon{font-size:56px}.mode-card h2{font-size:24px}.mode-card p{font-size:14px}}.morse-key-container{display:flex;justify-content:center;align-items:center;padding:8px;flex-shrink:0;min-height:160px}.morse-key{width:140px;height:140px;border-radius:50%;background:linear-gradient(145deg,var(--color-accent),var(--color-accent-dim));border:5px solid var(--color-accent-deep);box-shadow:0 6px 16px #0006,inset 0 -4px 8px #00000040;cursor:pointer;transition:transform .15s cubic-bezier(.4,0,.2,1),box-shadow var(--t-base),background var(--t-base);display:flex;flex-direction:column;justify-content:center;align-items:center;user-select:none;-webkit-tap-highlight-color:transparent;touch-action:manipulation;position:relative;overflow:hidden}.morse-key:not(.disabled):hover{transform:scale(1.04);box-shadow:0 10px 25px #00000073,0 0 22px var(--color-accent-glow),inset 0 -4px 8px #00000040}.morse-key:not(.disabled):active,.morse-key.pressed{transform:scale(.92);box-shadow:0 4px 12px #00000080,0 0 24px var(--color-accent-glow),inset 0 8px 16px #00000080;background:linear-gradient(145deg,var(--color-accent-dim),var(--color-accent-deep))}.morse-key.pressed{animation:intensePulse .3s ease-out}@keyframes intensePulse{0%{box-shadow:0 4px 12px #00000080,inset 0 8px 16px #00000080}40%{box-shadow:0 0 24px var(--color-accent-glow),0 0 36px var(--color-accent-soft),inset 0 8px 16px #00000080}to{box-shadow:0 4px 12px #00000080,inset 0 8px 16px #00000080}}.morse-key.disabled{background:linear-gradient(145deg,var(--color-border-strong),var(--color-border));border-color:var(--color-border-strong);cursor:not-allowed;opacity:.5;box-shadow:0 4px 12px #0006}.morse-key-content{display:flex;flex-direction:column;align-items:center;gap:4px;position:relative;z-index:10}.morse-key-label{font-size:16px;font-weight:700;color:#fff;text-shadow:2px 2px 4px rgba(0,0,0,.5);letter-spacing:1px}.morse-key-hint{font-size:10px;color:#ffffffe6;text-shadow:1px 1px 2px rgba(0,0,0,.5)}.press-progress{position:absolute;bottom:0;left:50%;transform:translate(-50%);height:8px;background:linear-gradient(90deg,#f1c40f,var(--color-warning-strong),var(--color-warning-strong));border-radius:4px;transition:width .05s linear;box-shadow:0 0 16px #f39c12cc,inset 0 -2px 4px #0000004d;z-index:5}.ripple{position:absolute;border-radius:50%;background:radial-gradient(circle,rgba(255,255,255,.5) 0%,var(--color-accent-soft) 35%,transparent 70%);width:100%;height:100%;top:50%;left:50%;transform:translate(-50%,-50%) scale(0);animation:rippleEffect .8s cubic-bezier(0,0,.2,1);pointer-events:none;z-index:1}@keyframes rippleEffect{0%{transform:translate(-50%,-50%) scale(0);opacity:1}to{transform:translate(-50%,-50%) scale(2.5);opacity:0}}.timing-feedback{position:absolute;top:-120px;left:50%;transform:translate(-50%);background:linear-gradient(145deg,var(--color-surface),var(--color-surface-2));border:2px solid var(--color-accent);border-radius:var(--radius-md);padding:12px 16px;min-width:200px;box-shadow:0 4px 12px #0006,0 0 20px var(--color-accent-glow);animation:feedbackSlideIn .3s ease-out;z-index:100}@keyframes feedbackSlideIn{0%{opacity:0;transform:translate(-50%) translateY(-10px)}to{opacity:1;transform:translate(-50%) translateY(0)}}.timing-feedback-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;padding-bottom:8px;border-bottom:1px solid rgba(255,255,255,.1)}.timing-feedback-signal{font-size:28px;font-weight:700;color:var(--color-on-accent)}.timing-feedback-accuracy{font-size:24px;font-weight:700}.timing-feedback-details{display:grid;grid-template-columns:auto 1fr;gap:4px 12px;font-size:12px}.timing-feedback-label{color:#ffffffb3;text-align:right}.timing-feedback-value{color:var(--color-on-accent);font-weight:700}.adaptive-stats{position:absolute;top:-50px;left:50%;transform:translate(-50%);background:#000000b3;border:2px solid rgba(139,195,74,.5);border-radius:8px;padding:6px 12px;display:flex;gap:8px;align-items:center;font-size:12px;white-space:nowrap}.adaptive-stats-label{color:#fffc}.adaptive-stats-value{color:var(--color-accent);font-weight:700}.timing-targets{position:absolute;bottom:-60px;left:50%;transform:translate(-50%);display:flex;gap:20px;background:#0009;border:2px solid rgba(255,255,255,.2);border-radius:12px;padding:8px 16px}.timing-target{display:flex;flex-direction:column;align-items:center;gap:4px}.timing-target-symbol{font-size:24px;font-weight:700;color:var(--color-on-accent)}.timing-target-value{font-size:11px;color:#ffffffb3;font-weight:600}.settings-overlay{position:fixed;inset:0;background:#000000b3;display:flex;justify-content:center;align-items:center;z-index:1000;animation:settings-fade .18s ease;backdrop-filter:blur(4px);padding:20px}@keyframes settings-fade{0%{opacity:0}to{opacity:1}}.settings-panel{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);width:100%;max-width:640px;max-height:86vh;display:flex;flex-direction:column;overflow:hidden;box-shadow:0 10px 40px #0009;animation:settings-slide .22s cubic-bezier(.4,0,.2,1)}@keyframes settings-slide{0%{opacity:0;transform:translateY(12px) scale(.98)}to{opacity:1;transform:translateY(0) scale(1)}}.settings-header{display:flex;justify-content:space-between;align-items:center;padding:14px 18px;background:var(--color-surface-2);border-bottom:1px solid var(--color-border);color:var(--color-accent);flex-shrink:0}.settings-header h3{margin:0;font-size:14px;font-weight:600;font-family:var(--font-mono);letter-spacing:.04em}.settings-close-btn{background:var(--color-surface);border:1px solid var(--color-border);color:var(--color-text-dim);font-size:14px;cursor:pointer;padding:0;width:28px;height:28px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-sm);transition:background var(--t-base),border-color var(--t-base),color var(--t-base)}.settings-close-btn:hover{background:var(--color-surface-2);border-color:var(--color-accent);color:var(--color-accent)}.settings-tabs{display:flex;background:var(--color-surface);border-bottom:1px solid var(--color-border);padding:4px 4px 0;gap:2px;flex-shrink:0;overflow-x:auto;scrollbar-width:none}.settings-tabs::-webkit-scrollbar{display:none}.settings-tab{display:inline-flex;align-items:center;gap:6px;padding:10px 14px;background:transparent;border:none;border-bottom:2px solid transparent;color:var(--color-text-dim);font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.04em;cursor:pointer;transition:color var(--t-base),border-color var(--t-base),background var(--t-base);white-space:nowrap;border-radius:var(--radius-sm) var(--radius-sm) 0 0}.settings-tab:hover:not(.settings-tab--active){color:var(--color-text);background:var(--color-surface-2)}.settings-tab--active{color:var(--color-accent);border-bottom-color:var(--color-accent)}.settings-tab__icon{font-size:13px}.settings-tab__label{letter-spacing:.04em}.settings-content{padding:16px 18px 22px;overflow-y:auto;flex:1;background:var(--color-surface)}.settings-content::-webkit-scrollbar{width:8px}.settings-content::-webkit-scrollbar-track{background:var(--color-surface)}.settings-content::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:4px}.settings-content::-webkit-scrollbar-thumb:hover{background:var(--color-accent)}.settings-section{display:flex;flex-direction:column;gap:10px}.settings-section__header{margin-top:12px}.settings-section__header:first-child{margin-top:0}.settings-section__header h4{margin:0 0 4px;font-size:12px;font-weight:700;font-family:var(--font-mono);letter-spacing:.12em;text-transform:uppercase;color:var(--color-text-dim)}.settings-section__header p{margin:0 0 6px;font-size:12px;color:var(--color-text-dim);line-height:1.5;font-family:var(--font-mono)}.settings-section__header--sub{margin-top:18px;padding-top:14px;border-top:1px solid var(--color-border)}.settings-meta{font-size:11px;color:var(--color-text-dim);font-family:var(--font-mono)}.tolerance-grid{display:grid;grid-template-columns:1fr;gap:8px}@media(min-width:540px){.tolerance-grid{grid-template-columns:repeat(3,1fr)}}.tolerance-card{text-align:left;background:var(--color-surface-2);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:10px 12px;cursor:pointer;transition:border-color var(--t-base),background var(--t-base),transform 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var(--t-base)}.toggle-row__thumb{position:absolute;top:2px;left:2px;width:14px;height:14px;background:var(--color-text-dim);border-radius:50%;transition:left var(--t-base),background var(--t-base)}.toggle-row input:checked+.toggle-row__visual{background:var(--color-accent-soft);border-color:var(--color-accent)}.toggle-row input:checked+.toggle-row__visual .toggle-row__thumb{left:16px;background:var(--color-accent)}.toggle-row__text{display:flex;flex-direction:column;gap:2px;min-width:0}.toggle-row__label{font-family:var(--font-mono);font-size:13px;font-weight:600;color:var(--color-text)}.toggle-row__hint{font-family:var(--font-mono);font-size:11px;color:var(--color-text-dim);line-height:1.4}.slider-row{display:flex;flex-direction:column;gap:4px;padding:8px 10px;background:var(--color-surface-2);border:1px solid 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p{font-size:14px;color:var(--color-text);line-height:1.6;margin:0;font-family:Segoe UI,sans-serif}.landing-actions{text-align:center}.enter-chat-btn{background:linear-gradient(135deg,var(--color-accent),var(--color-accent-dim));color:var(--color-bg);border:none;padding:14px 40px;font-size:18px;font-weight:700;font-family:Monaco,monospace;border-radius:10px;cursor:pointer;transition:all .3s cubic-bezier(.4,0,.2,1);box-shadow:0 6px 20px #39d35366;display:inline-flex;align-items:center;gap:10px;margin-bottom:12px}.enter-chat-btn:hover{transform:translateY(-2px);box-shadow:0 10px 28px #39d35399;background:linear-gradient(135deg,var(--color-accent-dim),var(--color-accent-dim))}.enter-chat-btn:active{transform:translateY(-1px)}.btn-icon{font-size:20px;animation:slideRight 1.5s ease-in-out infinite}@keyframes slideRight{0%,to{transform:translate(0)}50%{transform:translate(4px)}}.landing-note{font-size:12px;color:#667eea;font-family:Monaco,monospace;margin:0}.landing-content::-webkit-scrollbar{width:6px}.landing-content::-webkit-scrollbar-track{background:var(--color-bg)}.landing-content::-webkit-scrollbar-thumb{background:var(--color-accent);border-radius:3px}.landing-content::-webkit-scrollbar-thumb:hover{background:var(--color-accent-dim)}@media(max-width:1080px){.landing-content{padding:25px 28px;max-height:90vh}.landing-title{font-size:30px}.morse-dot,.morse-dash{font-size:20px}.landing-tagline{font-size:15px;margin-bottom:18px}.landing-features{gap:10px;margin-bottom:18px}.feature-item{padding:14px 8px}.feature-icon{font-size:28px}.feature-item h3{font-size:14px}.feature-item p{font-size:12px}.landing-about{padding:15px}.landing-about h2{font-size:18px}.landing-about p{font-size:13px}.enter-chat-btn{padding:12px 32px;font-size:16px}}@media(max-width:768px){.landing-overlay{padding:10px}.landing-content{padding:22px 20px;border-radius:12px;max-height:92vh}.landing-title{font-size:26px}.morse-dot,.morse-dash{font-size:18px}.landing-tagline{font-size:14px;margin-bottom:16px}.landing-features{grid-template-columns:1fr;gap:10px;margin-bottom:16px}.feature-item{padding:14px 16px}.feature-icon{font-size:30px}.feature-item h3{font-size:15px}.feature-item p{font-size:13px}.landing-about{padding:14px;margin-bottom:16px}.landing-about h2{font-size:17px}.landing-about p{font-size:13px}.enter-chat-btn{width:100%;padding:12px 28px;font-size:16px}.landing-note{font-size:11px}}@media(max-width:480px){.landing-content{padding:18px 16px}.landing-title{font-size:22px}.morse-dot,.morse-dash{font-size:16px}.landing-tagline{font-size:13px}.feature-icon{font-size:26px}.feature-item h3{font-size:14px}.feature-item p{font-size:12px}.landing-about h2{font-size:16px}.landing-about 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