.lang-toggle{font-size:.75rem;font-weight:700;letter-spacing:.05em;padding:.35rem .65rem;border-radius:.5rem;border:1px solid var(--border-color);background:var(--bg-tertiary);color:var(--text-primary);cursor:pointer;transition:all .3s ease;text-transform:uppercase}.lang-toggle:hover{background:var(--accent-primary);color:#fff;border-color:var(--accent-primary)}:root{--bg-primary:#f8fafc;--bg-secondary:#ffffff;--bg-tertiary:#f1f5f9;--text-primary:#0f172a;--text-secondary:#475569;--text-tertiary:#64748b;--border-color:#e2e8f0;--accent-primary:#6366f1;--accent-secondary:#8b5cf6;--accent-gradient:linear-gradient(135deg,#6366f1 0%,#8b5cf6 100%);--success:#10b981;--warning:#f59e0b;--danger:#ef4444;--shadow-sm:0 1px 2px rgba(0,0,0,0.05);--shadow-md:0 4px 6px -1px rgba(0,0,0,0.1),0 2px 4px -2px rgba(0,0,0,0.05);--shadow-lg:0 10px 25px -3px rgba(0,0,0,0.1),0 4px 6px -4px rgba(0,0,0,0.05);--shadow-xl:0 20px 50px -12px rgba(0,0,0,0.15);--gauge-bg:#e2e8f0;--gauge-track:#cbd5e1}[data-theme="dark"]{--bg-primary:#0a0e27;--bg-secondary:#131836;--bg-tertiary:#1a1f3a;--text-primary:#f1f5f9;--text-secondary:#cbd5e1;--text-tertiary:#94a3b8;--border-color:#1e2444;--accent-primary:#818cf8;--accent-secondary:#a78bfa;--accent-gradient:linear-gradient(135deg,#818cf8 0%,#a78bfa 100%);--shadow-sm:0 1px 2px rgba(0,0,0,0.3);--shadow-md:0 4px 6px -1px rgba(0,0,0,0.4),0 2px 4px -2px rgba(0,0,0,0.3);--shadow-lg:0 10px 25px -3px rgba(0,0,0,0.5),0 4px 6px -4px rgba(0,0,0,0.4);--shadow-xl:0 20px 50px -12px rgba(0,0,0,0.6);--gauge-bg:#1e2444;--gauge-track:#2a3158}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Oxygen,Ubuntu,sans-serif;background:var(--bg-primary);color:var(--text-primary);line-height:1.6;min-height:100vh;transition:background 0.3s ease,color 0.3s ease;overflow-x:hidden}body::before{content:'';position:fixed;top:0;left:0;width:100%;height:100%;background:radial-gradient(circle at 20% 30%,rgba(99,102,241,0.08) 0%,transparent 50%),radial-gradient(circle at 80% 70%,rgba(139,92,246,0.08) 0%,transparent 50%);pointer-events:none;z-index:0}.container{max-width:1280px;margin:0 auto;padding:0 1.5rem;position:relative;z-index:1}.header{position:sticky;top:0;z-index:100;background:var(--bg-secondary);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid var(--border-color);transition:all 0.3s ease}.header-inner{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.5rem;max-width:1280px;margin:0 auto}.logo{display:flex;align-items:center;gap:0.75rem;font-size:1.5rem;font-weight:800;background:var(--accent-gradient);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;text-decoration:none}.logo-icon{width:40px;height:40px;background:var(--accent-gradient);border-radius:10px;display:flex;align-items:center;justify-content:center;color:white;font-weight:900;font-size:1.25rem;box-shadow:var(--shadow-md);-webkit-text-fill-color:white}.header-actions{display:flex;align-items:center;gap:0.75rem}.theme-toggle{width:44px;height:44px;border-radius:12px;background:var(--bg-tertiary);border:1px solid var(--border-color);color:var(--text-primary);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all 0.3s ease}.theme-toggle:hover{background:var(--accent-primary);color:white;transform:translateY(-2px)}.theme-toggle svg{width:20px;height:20px}.hero{padding:3rem 0 2rem;text-align:center}.hero-title{font-size:clamp(2rem,5vw,3.5rem);font-weight:800;margin-bottom:1rem;line-height:1.2;letter-spacing:-0.02em}.hero-title .gradient-text{background:var(--accent-gradient);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.hero-subtitle{font-size:clamp(1rem,2vw,1.25rem);color:var(--text-secondary);max-width:700px;margin:0 auto 3rem}.speedometer-wrapper{position:relative;max-width:500px;margin:0 auto 2rem;aspect-ratio:1}.speedometer{width:100%;height:100%;filter:drop-shadow(0 10px 30px rgba(99,102,241,0.3))}.speed-value-display{text-align:center;margin-top:1.5rem}.speed-number{font-size:clamp(3rem,8vw,5rem);font-weight:800;line-height:1;background:var(--accent-gradient);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;font-variant-numeric:tabular-nums}.speed-unit{font-size:1.25rem;color:var(--text-secondary);font-weight:600;margin-top:0.5rem;text-transform:uppercase;letter-spacing:0.1em}.speed-label{font-size:0.875rem;color:var(--text-tertiary);margin-top:0.25rem;text-transform:uppercase;letter-spacing:0.15em}.start-btn{display:inline-flex;align-items:center;gap:0.75rem;padding:1.25rem 3rem;font-size:1.125rem;font-weight:700;color:white;background:var(--accent-gradient);border:none;border-radius:100px;cursor:pointer;box-shadow:0 10px 30px rgba(99,102,241,0.4);transition:all 0.3s ease;position:relative;overflow:hidden;text-transform:uppercase;letter-spacing:0.05em}.start-btn::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,0.3),transparent);transition:left 0.6s ease}.start-btn:hover::before{left:100%}.start-btn:hover{transform:translateY(-3px);box-shadow:0 15px 40px rgba(99,102,241,0.5)}.start-btn:active{transform:translateY(-1px)}.start-btn:disabled{opacity:0.7;cursor:not-allowed;transform:none}.start-btn svg{width:24px;height:24px}.results-section{padding:2rem 0}.results-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-bottom:2rem}.result-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:16px;padding:1.5rem;text-align:center;transition:all 0.3s ease;position:relative;overflow:hidden}.result-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:var(--accent-gradient);transform:scaleX(0);transform-origin:left;transition:transform 0.5s ease}.result-card.active::before{transform:scaleX(1)}.result-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}.result-icon{width:48px;height:48px;margin:0 auto 1rem;background:var(--accent-gradient);border-radius:12px;display:flex;align-items:center;justify-content:center;color:white}.result-icon svg{width:24px;height:24px}.result-label{font-size:0.875rem;color:var(--text-tertiary);text-transform:uppercase;letter-spacing:0.1em;margin-bottom:0.5rem;font-weight:600}.result-value{font-size:2rem;font-weight:800;color:var(--text-primary);line-height:1;font-variant-numeric:tabular-nums}.result-unit{font-size:0.875rem;color:var(--text-secondary);margin-top:0.25rem;font-weight:600}.quality-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:20px;padding:2rem;text-align:center;margin-bottom:2rem;transition:all 0.3s ease}.quality-badge{display:inline-block;padding:0.5rem 1.5rem;border-radius:100px;font-weight:700;font-size:0.875rem;text-transform:uppercase;letter-spacing:0.1em;margin-bottom:1rem}.quality-badge.excellent{background:rgba(16,185,129,0.15);color:#10b981}.quality-badge.very-good{background:rgba(34,197,94,0.15);color:#22c55e}.quality-badge.good{background:rgba(59,130,246,0.15);color:#3b82f6}.quality-badge.regular{background:rgba(245,158,11,0.15);color:#f59e0b}.quality-badge.poor{background:rgba(249,115,22,0.15);color:#f97316}.quality-badge.very-poor{background:rgba(239,68,68,0.15);color:#ef4444}.quality-title{font-size:1.5rem;font-weight:700;margin-bottom:0.5rem}.quality-description{color:var(--text-secondary);max-width:600px;margin:0 auto}.info-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem;margin-bottom:2rem}.info-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:14px;padding:1.25rem;display:flex;align-items:center;gap:1rem;transition:all 0.3s ease}.info-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.info-icon{width:44px;height:44px;border-radius:10px;background:var(--bg-tertiary);display:flex;align-items:center;justify-content:center;color:var(--accent-primary);flex-shrink:0}.info-icon svg{width:22px;height:22px}.info-content{flex:1;min-width:0}.info-label{font-size:0.75rem;color:var(--text-tertiary);text-transform:uppercase;letter-spacing:0.08em;font-weight:600}.info-value{font-size:1rem;font-weight:700;color:var(--text-primary);margin-top:0.125rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.action-buttons{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap;margin:2rem 0}.btn-secondary{display:inline-flex;align-items:center;gap:0.5rem;padding:0.875rem 1.75rem;font-size:0.9375rem;font-weight:600;color:var(--text-primary);background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:100px;cursor:pointer;transition:all 0.3s ease}.btn-secondary:hover{background:var(--bg-tertiary);transform:translateY(-2px);box-shadow:var(--shadow-md)}.btn-secondary svg{width:18px;height:18px}.chart-section{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:20px;padding:2rem;margin-bottom:2rem}.chart-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.5rem;flex-wrap:wrap;gap:1rem}.chart-title{font-size:1.25rem;font-weight:700}.chart-legend{display:flex;gap:1rem;font-size:0.875rem}.legend-item{display:flex;align-items:center;gap:0.5rem;color:var(--text-secondary)}.legend-dot{width:10px;height:10px;border-radius:50%}.chart-canvas-wrapper{position:relative;height:250px;width:100%}#speedChart{width:100%;height:100%;display:block}.history-section{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:20px;padding:2rem;margin-bottom:2rem}.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.5rem;flex-wrap:wrap;gap:1rem}.section-title{font-size:1.5rem;font-weight:700}.clear-history-btn{padding:0.5rem 1rem;font-size:0.875rem;color:var(--danger);background:transparent;border:1px solid var(--danger);border-radius:8px;cursor:pointer;transition:all 0.3s ease;font-weight:600}.clear-history-btn:hover{background:var(--danger);color:white}.history-list{display:flex;flex-direction:column;gap:0.75rem}.history-item{display:grid;grid-template-columns:auto 1fr auto;gap:1rem;align-items:center;padding:1rem;background:var(--bg-tertiary);border-radius:12px;transition:all 0.3s ease}.history-item:hover{transform:translateX(4px)}.history-date{font-size:0.8125rem;color:var(--text-tertiary);font-weight:600;min-width:100px}.history-stats{display:flex;gap:1.5rem;flex-wrap:wrap;font-size:0.875rem}.history-stat{display:flex;align-items:center;gap:0.375rem;color:var(--text-secondary)}.history-stat strong{color:var(--text-primary);font-weight:700}.history-quality{padding:0.25rem 0.75rem;border-radius:100px;font-size:0.75rem;font-weight:700;text-transform:uppercase}.empty-history{text-align:center;padding:3rem 1rem;color:var(--text-tertiary)}.empty-history svg{width:64px;height:64px;margin-bottom:1rem;opacity:0.3}.edu-section{padding:4rem 0}.edu-section-title{font-size:clamp(1.75rem,3vw,2.5rem);font-weight:800;text-align:center;margin-bottom:1rem}.edu-section-subtitle{text-align:center;color:var(--text-secondary);margin-bottom:3rem;max-width:700px;margin-left:auto;margin-right:auto}.edu-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.5rem;margin-bottom:3rem}.edu-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:16px;padding:1.75rem;transition:all 0.3s ease}.edu-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--accent-primary)}.edu-card-icon{width:56px;height:56px;background:var(--accent-gradient);border-radius:14px;display:flex;align-items:center;justify-content:center;color:white;margin-bottom:1rem}.edu-card-icon svg{width:28px;height:28px}.edu-card h3{font-size:1.125rem;font-weight:700;margin-bottom:0.5rem}.edu-card p{color:var(--text-secondary);font-size:0.9375rem;line-height:1.6}.recommendations{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:20px;padding:2rem;margin-bottom:3rem}.recommendations h2{font-size:1.5rem;font-weight:700;margin-bottom:1.5rem;text-align:center}.rec-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem}.rec-item{background:var(--bg-tertiary);border-radius:12px;padding:1.25rem;text-align:center;transition:all 0.3s ease}.rec-item:hover{transform:translateY(-2px)}.rec-icon{font-size:2rem;margin-bottom:0.5rem}.rec-title{font-weight:700;margin-bottom:0.25rem;font-size:0.9375rem}.rec-speed{color:var(--accent-primary);font-weight:800;font-size:1.125rem}.rec-desc{font-size:0.8125rem;color:var(--text-tertiary);margin-top:0.25rem}.faq-section{padding:2rem 0 4rem}.faq-list{max-width:900px;margin:0 auto;display:flex;flex-direction:column;gap:0.75rem}.faq-item{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:14px;overflow:hidden;transition:all 0.3s ease}.faq-item:hover{border-color:var(--accent-primary)}.faq-question{width:100%;padding:1.25rem 1.5rem;background:transparent;border:none;color:var(--text-primary);font-size:1rem;font-weight:600;text-align:left;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:1rem;transition:all 0.3s ease}.faq-question:hover{color:var(--accent-primary)}.faq-icon{width:24px;height:24px;border-radius:50%;background:var(--bg-tertiary);display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:all 0.3s ease}.faq-item.active .faq-icon{background:var(--accent-gradient);color:white;transform:rotate(45deg)}.faq-answer{max-height:0;overflow:hidden;transition:max-height 0.4s ease}.faq-answer-inner{padding:0 1.5rem 1.25rem;color:var(--text-secondary);line-height:1.7}.footer{background:var(--bg-secondary);border-top:1px solid var(--border-color);padding:2rem 0;text-align:center;color:var(--text-tertiary);font-size:0.875rem}.footer a{color:var(--accent-primary);text-decoration:none}.loading-pulse{animation:pulse 1.5s ease-in-out infinite}@keyframes pulse{0%,100%{opacity:1}50%{opacity:0.5}}.testing-indicator{display:inline-flex;align-items:center;gap:0.5rem;padding:0.5rem 1rem;background:var(--accent-gradient);color:white;border-radius:100px;font-size:0.875rem;font-weight:600;margin-bottom:1rem}.testing-dot{width:8px;height:8px;background:white;border-radius:50%;animation:blink 1s infinite}@keyframes blink{0%,100%{opacity:1}50%{opacity:0.3}}.toast{position:fixed;bottom:2rem;left:50%;transform:translateX(-50%) translateY(200%);background:var(--bg-secondary);border:1px solid var(--border-color);padding:1rem 1.5rem;border-radius:12px;box-shadow:var(--shadow-xl);z-index:1000;transition:transform 0.4s ease;font-weight:600}.toast.show{transform:translateX(-50%) translateY(0)}@media (max-width:768px){.hero{padding:2rem 0 1rem}.results-grid{grid-template-columns:repeat(2,1fr)}.history-item{grid-template-columns:1fr;text-align:left}.history-stats{gap:1rem}.start-btn{padding:1rem 2rem;font-size:1rem}.edu-grid{grid-template-columns:1fr}}@media (max-width:480px){.results-grid{grid-template-columns:1fr}.header-inner{padding:0.75rem 1rem}.logo{font-size:1.25rem}.logo-icon{width:36px;height:36px;font-size:1rem}}@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:0.01ms !important;transition-duration:0.01ms !important}}:focus-visible{outline:2px solid var(--accent-primary);outline-offset:2px}::-webkit-scrollbar{width:10px;height:10px}::-webkit-scrollbar-track{background:var(--bg-tertiary)}::-webkit-scrollbar-thumb{background:var(--accent-primary);border-radius:5px}::-webkit-scrollbar-thumb:hover{background:var(--accent-secondary)}