:root{--color-grammar: #6B8FD4;--color-reading: #4ABFA0;--color-writing: #9B8FE8;--color-vocab: #E8A060;--color-listening: #50C4BE;--color-speaking: #E85DA0;--color-bg: #f5f6f8;--color-card: #ffffff;--color-text: #2d2d3a;--color-text-secondary: #8b8fa3;--color-correct: #4ade80;--color-wrong: #f87171;--color-border: #ebebf0;--radius: 16px;--radius-sm: 12px;--shadow: 0 1px 3px rgba(0, 0, 0, .04), 0 4px 16px rgba(0, 0, 0, .04);--shadow-lg: 0 2px 8px rgba(0, 0, 0, .04), 0 8px 32px rgba(0, 0, 0, .06);--max-width: 640px}*{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;-webkit-text-size-adjust:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--color-bg);color:var(--color-text);min-width:320px;overflow-x:hidden;line-height:1.65;letter-spacing:-.01em}.container{max-width:var(--max-width);margin:0 auto;padding:0 20px}.card{background:var(--color-card);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}button,.btn{min-height:48px;min-width:48px;border:none;border-radius:var(--radius-sm);font-size:.95rem;font-weight:500;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;padding:12px 20px;transition:transform .15s ease,opacity .15s ease,box-shadow .15s ease;-webkit-tap-highlight-color:transparent}button:active,.btn:active{transform:scale(.97)}.btn-primary{background:var(--color-grammar);color:#fff}.btn-option{background:#fff;color:var(--color-text);border:none;box-shadow:var(--shadow);width:100%;text-align:left;padding:16px 18px;font-weight:400;border-radius:var(--radius);transition:background .15s ease,opacity .2s ease,box-shadow .15s ease,transform .15s ease}.btn-option:not(:disabled):hover{background:color-mix(in srgb,var(--accent, var(--color-grammar)) 5%,white);box-shadow:var(--shadow-lg)}.btn-option:not(:disabled):active{transform:scale(.97);background:color-mix(in srgb,var(--accent, var(--color-grammar)) 8%,white)}.btn-option:disabled{opacity:.4;cursor:default;transform:none}.btn-option.correct{background:#f0fdf4;box-shadow:0 0 0 2px color-mix(in srgb,var(--color-correct) 30%,transparent);opacity:1;font-weight:500}.btn-option.wrong{background:#fef2f2;box-shadow:none;opacity:1}.btn-grammar{background:var(--color-grammar);color:#fff}.btn-reading{background:var(--color-reading);color:#fff}.btn-writing{background:var(--color-writing);color:#fff}.btn-vocab{background:var(--color-vocab);color:#fff}textarea,input[type=text]{width:100%;min-height:48px;padding:14px 16px;border:none;border-radius:var(--radius-sm);font-size:1rem;font-family:inherit;line-height:1.5;background:var(--color-bg);color:var(--color-text);transition:box-shadow .2s ease}textarea:focus,input[type=text]:focus{outline:none;box-shadow:0 0 0 2px color-mix(in srgb,var(--accent, var(--color-grammar)) 30%,transparent)}h1{font-size:1.5rem;font-weight:700;line-height:1.3;letter-spacing:-.02em}h2{font-size:1.2rem;font-weight:600;line-height:1.35;letter-spacing:-.01em}h3{font-size:1.05rem;font-weight:600}.text-secondary{color:var(--color-text-secondary)}.text-center{text-align:center}.mt-sm{margin-top:8px}.mt-md{margin-top:16px}.mt-lg{margin-top:24px}.mb-sm{margin-bottom:8px}.mb-md{margin-bottom:16px}.mb-lg{margin-bottom:24px}.gap-sm{gap:8px}.gap-md{gap:12px}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-between{justify-content:space-between}.justify-center{justify-content:center}@keyframes shake{0%,to{transform:translate(0)}20%{transform:translate(-8px)}40%{transform:translate(8px)}60%{transform:translate(-4px)}80%{transform:translate(4px)}}@keyframes slide-in{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}.animate-shake{animation:shake .5s ease}.animate-slide-in{animation:slide-in .35s ease}@keyframes bounce{0%{transform:scale(.3) translateY(20px);opacity:0}30%{transform:scale(1.15) translateY(-16px);opacity:1}50%{transform:scale(.95) translateY(0)}70%{transform:scale(1.05) translateY(-8px)}to{transform:scale(1) translateY(0)}}@keyframes float{0%,to{transform:translateY(0) rotate(0)}25%{transform:translateY(-8px) rotate(2deg)}75%{transform:translateY(-4px) rotate(-2deg)}}@keyframes wiggle{0%{transform:scale(.8) rotate(0);opacity:.5}20%{transform:scale(1.05) rotate(-8deg);opacity:1}40%{transform:scale(1) rotate(6deg)}60%{transform:scale(1) rotate(-4deg)}80%{transform:scale(1) rotate(2deg)}to{transform:scale(1) rotate(0)}}@keyframes sparkle{0%{transform:scale(.3) rotate(-10deg);opacity:0}30%{transform:scale(1.2) rotate(5deg);opacity:1}50%{transform:scale(.95) rotate(-3deg)}70%{transform:scale(1.1) rotate(2deg)}to{transform:scale(1) rotate(0)}}@keyframes glow-pulse{0%,to{filter:drop-shadow(0 0 0px transparent)}50%{filter:drop-shadow(0 0 12px rgba(107,143,212,.4))}}.animate-bounce{animation:bounce .7s cubic-bezier(.34,1.56,.64,1)}.animate-float{animation:float 2s ease-in-out infinite}.animate-wiggle{animation:wiggle .6s ease}.animate-sparkle{animation:sparkle .8s cubic-bezier(.34,1.56,.64,1),glow-pulse 1.5s ease .8s 2}.accent-card{border-left:3px solid var(--accent, var(--color-grammar))}.question-text{font-size:1.08rem;font-weight:600;line-height:1.5;text-align:center;margin:8px 0}.progress-dots{display:flex;gap:8px;align-items:center}.progress-dot{width:30px;height:30px;border-radius:50%;background:var(--color-border);display:flex;align-items:center;justify-content:center;font-size:.7rem;font-weight:600;color:transparent;transition:all .25s ease;border:2px solid transparent}.progress-dot.active{background:color-mix(in srgb,var(--accent, var(--color-grammar)) 15%,white);border-color:var(--accent, var(--color-grammar));box-shadow:0 0 0 3px color-mix(in srgb,var(--accent, var(--color-grammar)) 12%,transparent);color:var(--accent, var(--color-grammar))}.progress-dot.done{background:var(--accent, var(--color-grammar));color:#fff}.progress-dot.done:after{content:"✓";font-size:.75rem;font-weight:700}.app.svelte-12qhfyh{min-height:100dvh;display:flex;flex-direction:column}main.svelte-12qhfyh{flex:1;padding-top:16px;padding-bottom:80px}.bottom-nav.svelte-12qhfyh{position:fixed;bottom:0;left:0;right:0;display:flex;justify-content:center;gap:0;background:var(--color-card);box-shadow:0 -1px 8px #0000000f;padding:8px 0;padding-bottom:env(safe-area-inset-bottom,8px);z-index:100}.nav-item.svelte-12qhfyh{display:flex;flex-direction:column;align-items:center;gap:2px;padding:6px 24px;text-decoration:none;color:var(--color-text-secondary);font-size:.75rem;transition:color .15s ease;-webkit-tap-highlight-color:transparent}.nav-item.active.svelte-12qhfyh{color:var(--color-grammar)}.nav-icon.svelte-12qhfyh{font-size:1.3rem}.nav-label.svelte-12qhfyh{font-weight:600}