:root{--bg: #07071A;--bg-gradient: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(79,60,255,.35) 0%, transparent 70%), radial-gradient(ellipse 60% 40% at 80% 60%, rgba(120,60,255,.18) 0%, transparent 60%), linear-gradient(180deg, #07071A 0%, #0D0D2B 100%);--surface: rgba(255,255,255,.05);--surface-hover: rgba(255,255,255,.09);--text: #FFFFFF;--text-secondary: rgba(255,255,255,.55);--text-muted: rgba(255,255,255,.35);--primary: #5B63FF;--primary-hover: #7880FF;--primary-glow: rgba(91,99,255,.45);--accent: #A259FF;--success: #30D158;--error: #FF453A;--border: rgba(255,255,255,.1);--border-bright: rgba(255,255,255,.18);--radius: 20px;--radius-sm: 12px;--shadow: 0 4px 32px rgba(0,0,0,.4);--shadow-lg: 0 12px 60px rgba(0,0,0,.55);--blur: blur(24px);--font: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", sans-serif;--transition: .28s cubic-bezier(.34, 1.56, .64, 1)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{font-family:var(--font);background:var(--bg);background-image:var(--bg-gradient);background-attachment:fixed;color:var(--text);min-height:100dvh;display:flex;align-items:flex-start;justify-content:center;padding:0;line-height:1.5}.screen{position:fixed;top:0;right:0;bottom:0;left:0;display:flex;align-items:flex-start;justify-content:center;padding:0;opacity:0;pointer-events:none;transition:opacity .32s ease;z-index:1;overflow-y:auto}.screen.active{opacity:1;pointer-events:all;position:relative;inset:unset}#screen-start{display:flex;flex-direction:column;align-items:center;min-height:100dvh;padding:0}#screen-start.active{display:flex}.hero-section{width:100%;display:flex;flex-direction:column;align-items:center;text-align:center;padding:80px 24px 60px;position:relative}.hero-badge{display:inline-flex;align-items:center;gap:8px;padding:6px 16px;border-radius:100px;background:#5b63ff26;border:1px solid rgba(91,99,255,.35);font-size:13px;font-weight:600;color:#8b8fff;letter-spacing:.3px;margin-bottom:28px}.hero-badge-dot{width:7px;height:7px;border-radius:50%;background:var(--primary);animation:badge-pulse 2s ease-in-out infinite}@keyframes badge-pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(.7)}}.hero-title{font-size:clamp(36px,7vw,72px);font-weight:800;letter-spacing:-1.5px;line-height:1.08;margin-bottom:20px;background:linear-gradient(135deg,#fff,#ffffffbf);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-title .gradient-word{background:linear-gradient(135deg,#5b63ff,#a259ff);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-subtitle{font-size:clamp(15px,2.5vw,19px);color:var(--text-secondary);max-width:540px;line-height:1.65;margin-bottom:48px;font-weight:400}.hero-actions{display:flex;flex-direction:column;align-items:center;gap:16px;width:100%;max-width:340px}.lang-selector{display:flex;gap:6px;background:#ffffff0d;padding:4px;border-radius:12px;border:1px solid var(--border)}.lang-btn{flex:1;padding:8px 18px;border:none;border-radius:9px;font-family:var(--font);font-size:14px;font-weight:500;cursor:pointer;background:transparent;color:var(--text-secondary);transition:background .2s,color .2s,transform .15s}.lang-btn.active{background:#ffffff1a;color:var(--text);box-shadow:0 1px 8px #0000004d}.lang-btn:hover:not(.active){background:#ffffff0f;color:var(--text)}.features-section{width:100%;max-width:960px;padding:0 24px 80px;display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.feature-card{padding:28px 24px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--border);backdrop-filter:var(--blur);-webkit-backdrop-filter:var(--blur);display:flex;flex-direction:column;gap:12px;transition:border-color .2s,background .2s,transform .2s}.feature-card:hover{border-color:var(--border-bright);background:var(--surface-hover);transform:translateY(-2px)}.feature-icon{font-size:32px;line-height:1}.feature-title{font-size:15px;font-weight:700;color:var(--text)}.feature-desc{font-size:13px;color:var(--text-secondary);line-height:1.55}.glass{background:var(--surface);backdrop-filter:var(--blur);-webkit-backdrop-filter:var(--blur);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}.card{width:100%;max-width:520px;padding:40px 32px}.center{text-align:center;display:flex;flex-direction:column;align-items:center;gap:16px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:15px 28px;border:none;border-radius:14px;font-family:var(--font);font-size:16px;font-weight:600;cursor:pointer;transition:transform var(--transition),box-shadow .2s,background .2s;width:100%;max-width:300px}.btn-primary{background:linear-gradient(135deg,var(--primary) 0%,var(--accent) 100%);color:#fff;box-shadow:0 4px 24px var(--primary-glow)}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 32px var(--primary-glow);filter:brightness(1.1)}.btn-primary:active{transform:translateY(0) scale(.98)}.btn.hidden{display:none}.quiz-screen-inner{width:100%;min-height:100dvh;display:flex;align-items:flex-start;justify-content:center;padding:24px 16px}.quiz-container{width:100%;max-width:660px;display:flex;flex-direction:column;gap:0}.quiz-header{display:flex;align-items:center;gap:16px;padding:16px 20px;margin-bottom:16px;background:var(--surface);backdrop-filter:var(--blur);-webkit-backdrop-filter:var(--blur);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}.progress-wrap{flex:1;display:flex;flex-direction:column;gap:6px}.progress-bar{height:5px;background:#ffffff14;border-radius:3px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--primary),var(--accent));border-radius:3px;transition:width .4s cubic-bezier(.4,0,.2,1);width:5%;box-shadow:0 0 8px var(--primary-glow)}.progress-text{font-size:12px;font-weight:600;color:var(--text-secondary)}.score-badge{font-size:14px;font-weight:600;color:var(--primary);white-space:nowrap}.question-wrap{background:var(--surface);backdrop-filter:var(--blur);-webkit-backdrop-filter:var(--blur);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px 24px;display:flex;flex-direction:column;gap:20px}.category-tag{display:inline-block;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.8px;color:#8b8fff;background:#5b63ff26;padding:4px 10px;border-radius:6px;align-self:flex-start;border:1px solid rgba(91,99,255,.25)}.question-text{font-size:clamp(15px,2.5vw,18px);font-weight:600;line-height:1.55;color:var(--text)}.options-list{list-style:none;display:flex;flex-direction:column;gap:10px}.option-item{display:flex;align-items:flex-start;gap:12px;padding:14px 16px;border:1.5px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;background:#ffffff08;transition:border-color .2s,background .2s,transform var(--transition),box-shadow .2s;font-size:14px;font-weight:500;color:var(--text);-webkit-user-select:none;user-select:none}.option-item:hover:not(.disabled){border-color:var(--primary);background:#5b63ff1a;transform:translateY(-1px);box-shadow:0 4px 16px #5b63ff33}.option-item:active:not(.disabled){transform:scale(.98)}.option-letter{flex-shrink:0;width:28px;height:28px;border-radius:8px;background:#ffffff12;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;color:var(--text-secondary);transition:background .2s,color .2s}.option-text{flex:1;line-height:1.45}.option-item.correct{border-color:var(--success);background:#30d1581f}.option-item.correct .option-letter{background:var(--success);color:#fff}.option-item.wrong{border-color:var(--error);background:#ff453a1a}.option-item.wrong .option-letter{background:var(--error);color:#fff}.option-item.disabled{cursor:default}.explanation-box{background:#5b63ff14;border-left:3px solid var(--primary);border-radius:0 10px 10px 0;padding:14px 16px;font-size:13px;line-height:1.6;color:var(--text-secondary)}.explanation-box.hidden{display:none}.result-screen-inner{width:100%;min-height:100dvh;display:flex;align-items:center;justify-content:center;padding:24px 16px}.result-card{max-width:420px}.result-emoji{font-size:64px;line-height:1}.result-title{font-size:22px;font-weight:700}.result-score{font-size:72px;font-weight:800;background:linear-gradient(135deg,var(--primary) 0%,var(--accent) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1}.result-total{font-size:30px;font-weight:500;color:var(--text-secondary);-webkit-text-fill-color:var(--text-secondary)}.result-msg{font-size:15px;color:var(--text-secondary);line-height:1.5}@media(max-width:720px){.features-section{grid-template-columns:1fr;padding-bottom:60px}}@media(max-width:480px){.hero-section{padding:60px 20px 48px}.hero-title{letter-spacing:-.8px}.card{padding:28px 20px}.question-wrap{padding:20px 16px}.quiz-header{padding:12px 16px}.btn{max-width:100%}.result-score{font-size:56px}.quiz-screen-inner,.result-screen-inner{padding:16px 12px}}@keyframes pulse-correct{0%{box-shadow:0 0 #30d15880}50%{box-shadow:0 0 0 12px #30d15800}to{box-shadow:0 0 #30d15800}}@keyframes shake{0%,to{transform:translate(0)}15%{transform:translate(-6px)}30%{transform:translate(6px)}45%{transform:translate(-5px)}60%{transform:translate(5px)}75%{transform:translate(-3px)}90%{transform:translate(3px)}}@keyframes slide-up{0%{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}@keyframes spring-in{0%{opacity:0;transform:scale(.88) translateY(16px)}60%{opacity:1;transform:scale(1.03) translateY(-2px)}to{opacity:1;transform:scale(1) translateY(0)}}@keyframes fade-in{0%{opacity:0}to{opacity:1}}@keyframes score-pop{0%{transform:scale(1)}40%{transform:scale(1.3)}to{transform:scale(1)}}@keyframes typewriter-reveal{0%{clip-path:inset(0 100% 0 0);opacity:0}to{clip-path:inset(0 0% 0 0);opacity:1}}@keyframes text-reveal{0%{opacity:0;transform:translateY(28px);filter:blur(8px)}to{opacity:1;transform:translateY(0);filter:blur(0)}}@keyframes shimmer{0%{background-position:-200% center}to{background-position:200% center}}@keyframes badge-in{0%{opacity:0;transform:translateY(-12px) scale(.9)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes card-in{0%{opacity:0;transform:translateY(32px)}to{opacity:1;transform:translateY(0)}}.hero-badge{animation:badge-in .5s cubic-bezier(.34,1.56,.64,1) .1s both}.hero-title{animation:text-reveal .7s cubic-bezier(.22,1,.36,1) .25s both}.hero-subtitle{animation:text-reveal .7s cubic-bezier(.22,1,.36,1) .45s both}.hero-actions{animation:slide-up .6s cubic-bezier(.34,1.2,.64,1) .6s both}.feature-card:nth-child(1){animation:card-in .6s cubic-bezier(.22,1,.36,1) .75s both}.feature-card:nth-child(2){animation:card-in .6s cubic-bezier(.22,1,.36,1) .85s both}.feature-card:nth-child(3){animation:card-in .6s cubic-bezier(.22,1,.36,1) .95s both}.gradient-word{background-size:200% auto;animation:shimmer 3s linear 1.5s infinite}.question-enter{animation:spring-in .42s cubic-bezier(.34,1.56,.64,1) both}.option-item.correct{animation:pulse-correct .55s ease-out}.option-item.wrong{animation:shake .45s ease-out}.explanation-box:not(.hidden){animation:slide-up .35s cubic-bezier(.34,1.2,.64,1) both}.btn:not(.hidden){animation:slide-up .38s .1s cubic-bezier(.34,1.2,.64,1) both}.score-pop{animation:score-pop .4s cubic-bezier(.34,1.56,.64,1)}.result-card{animation:spring-in .5s cubic-bezier(.34,1.56,.64,1) both}.options-list .option-item{animation:slide-up .3s cubic-bezier(.34,1.2,.64,1) both}.options-list .option-item:nth-child(1){animation-delay:.05s}.options-list .option-item:nth-child(2){animation-delay:.1s}.options-list .option-item:nth-child(3){animation-delay:.15s}.options-list .option-item:nth-child(4){animation-delay:.2s}.btn-primary{transition:transform .28s cubic-bezier(.34,1.56,.64,1),box-shadow .2s ease,background .2s ease}.screen{transition:opacity .3s ease}
