:root{font-family:IBM Plex Sans KR,Noto Sans KR,Pretendard,Malgun Gothic,sans-serif;line-height:1.5;font-weight:400;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;background:#f4f7fb}a{color:inherit;text-decoration:none}a:hover{text-decoration:underline}#root{min-height:100vh}:root{--primary: #2563eb;--primary-hover: #1d4ed8;--primary-soft: #dbeafe;--secondary: #0891b2;--bg-gradient: linear-gradient(180deg, #f5f7fb 0%, #eef2f7 45%, #eaf2ff 100%);--card-bg: #ffffff;--text-main: #0f172a;--text-muted: #5b6472;--border: #dbe3f0;--radius: 18px;--shadow-sm: 0 4px 12px -6px rgba(15, 23, 42, .12);--shadow-md: 0 12px 25px -12px rgba(15, 23, 42, .22);--shadow-lg: 0 20px 40px -18px rgba(15, 23, 42, .3);--shadow-glow: 0 0 18px rgba(37, 99, 235, .25)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:IBM Plex Sans KR,Noto Sans KR,Pretendard,Malgun Gothic,sans-serif;background:var(--bg-gradient);color:var(--text-main);min-height:100vh;-webkit-font-smoothing:antialiased}.app-layout{display:flex;flex-direction:column;min-height:100vh;background:transparent;position:relative}.app-layout:before{content:"";position:fixed;inset:0;pointer-events:none;background:radial-gradient(40rem 40rem at 20% -10%,rgba(37,99,235,.1),transparent 60%),radial-gradient(45rem 45rem at 80% 0%,rgba(8,145,178,.08),transparent 58%);z-index:-1}.main-content{flex:1;padding:2rem 1rem 3rem;max-width:900px;margin:0 auto;width:100%}.main-header{padding:1rem 2rem;background:#ffffffe6;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center;position:sticky;top:0;z-index:100}.logo-container{display:flex;align-items:center;gap:.75rem}.logo-icon{color:var(--primary)}.logo-text{display:flex;flex-direction:column}.logo-title{font-weight:800;font-size:1.25rem;letter-spacing:-.025em;color:var(--text-main)}.logo-badge{font-size:.75rem;font-weight:600;color:var(--secondary);text-transform:uppercase}.home-container{display:flex;flex-direction:column;gap:2rem;animation:fadeIn .5s ease-out}.hero-section{text-align:center;padding:2rem 0}.hero-title{font-size:clamp(2rem,4vw,3.2rem);line-height:1.1;font-weight:900;background:linear-gradient(to right,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:.5rem}.hero-subtitle{font-size:clamp(1rem,2vw,1.3rem);color:var(--text-muted)}.settings-card{background:var(--card-bg);padding:clamp(1.25rem,3vw,2rem);border-radius:24px;box-shadow:var(--shadow-lg);border:1px solid var(--border);display:flex;flex-direction:column;gap:2rem;position:relative;overflow:hidden}.setting-section h3{margin-bottom:1rem;font-size:1.05rem;color:var(--text-main);font-weight:700}.category-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}.category-button{display:flex;flex-direction:column;align-items:center;gap:.5rem;padding:1rem .75rem;border:1px solid var(--border);background:#fff;border-radius:var(--radius);cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1);box-shadow:var(--shadow-sm);min-height:88px}.category-button:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.category-button.active{background:#fff;border-color:var(--active-color);color:var(--active-color);box-shadow:0 0 15px var(--active-color)}.count-selector{display:flex;gap:.5rem}.count-button{flex:1;padding:.75rem;border:1px solid var(--border);background:#fff;border-radius:12px;font-weight:600;cursor:pointer;transition:all .2s}.count-button.active{background:var(--primary);color:#fff;border-color:var(--primary);box-shadow:var(--shadow-glow)}.voice-selector{display:flex;gap:1rem}.voice-button{flex:1;display:flex;align-items:center;justify-content:center;gap:.5rem;padding:1rem;border:1px solid var(--border);background:#fff;border-radius:var(--radius);font-weight:600;cursor:pointer;transition:all .2s}.voice-button.active{background:#f1f5f9;border-color:var(--primary);color:var(--primary)}.start-button{margin-top:1rem;padding:1.25rem;background:linear-gradient(to right,var(--primary),var(--secondary));color:#fff;border:none;border-radius:var(--radius);font-size:1.25rem;font-weight:700;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:.75rem;transition:all .3s;box-shadow:0 10px 20px -5px #6366f166}.start-button:hover{transform:scale(1.02);box-shadow:0 15px 30px -5px #6366f180}.quiz-container{display:flex;flex-direction:column;gap:1.5rem;animation:slideIn .4s ease-out}.progress-bar-container{width:100%;height:8px;background:#e5efff;border-radius:4px;overflow:hidden;margin-bottom:.75rem}.progress-bar{height:100%;background:linear-gradient(to right,var(--primary),var(--secondary));transition:width .3s ease-in-out}.quiz-stats{display:flex;justify-content:space-between;align-items:center;color:var(--text-muted);font-weight:600}.category-tag{padding:.25rem .75rem;background:#f1f5f9;border-radius:20px;font-size:.8rem;color:var(--primary)}.audio-section{display:flex;justify-content:center;padding:1rem 0}.audio-button{display:flex;flex-direction:column;align-items:center;gap:.5rem;background:#fff;border:none;padding:2rem;border-radius:50%;width:140px;height:140px;box-shadow:var(--shadow-lg);cursor:pointer;transition:all .2s;color:var(--primary);border:4px solid rgba(8,145,178,.12)}.audio-button:hover{transform:scale(1.05);box-shadow:0 15px 30px #6366f133}.audio-button span{font-weight:700;font-size:.9rem}.target-area{min-height:100px;background:#fff;border:2px dashed #cbd5e1;border-radius:var(--radius);padding:1.5rem;display:flex;flex-wrap:wrap;gap:.75rem;align-items:center;justify-content:center;margin-bottom:2rem}.placeholder-text{color:var(--text-muted);font-style:italic}.word-bank{display:flex;flex-wrap:wrap;gap:.75rem;justify-content:center}.word-chip{padding:.75rem 1.25rem;background:#fff;border:1px solid var(--border);border-radius:12px;font-size:1.1rem;font-weight:600;cursor:pointer;transition:all .2s;box-shadow:var(--shadow-sm)}.word-chip:hover:not(:disabled){background:#f8fafc;transform:translateY(-2px);box-shadow:var(--shadow-md)}.word-chip.selected{background:var(--primary);color:#fff;border-color:var(--primary)}.quiz-actions{display:flex;gap:1rem;margin-top:1rem}.primary-button,.secondary-button{flex:1;padding:1rem;border-radius:12px;font-weight:700;display:flex;align-items:center;justify-content:center;gap:.5rem;cursor:pointer;transition:all .2s}.primary-button{background:var(--primary);color:#fff;border:none}.primary-button:disabled{background:#cbd5e1;cursor:not-allowed}.secondary-button{background:#fff;color:var(--text-main);border:1px solid #e2e8f0}.feedback-container{width:100%;padding:1.35rem;border-radius:var(--radius);display:flex;flex-direction:column;gap:1rem}.feedback-container.correct{background:#ecfdf5;border:1px solid #10b981}.feedback-container.incorrect{background:#fef2f2;border:1px solid #ef4444}.feedback-content h3{margin-bottom:.5rem}.correct-answer{font-weight:700;font-size:1.2rem;color:var(--text-main);margin-bottom:.25rem}.translation{color:var(--text-muted);font-style:italic}.result-container{display:flex;flex-direction:column;gap:2.5rem}.result-header{text-align:center;background:#fff;padding:3rem 2rem;border-radius:24px;box-shadow:var(--shadow-lg)}.score-badge{display:flex;flex-direction:column;margin:1.5rem 0}.score-value{font-size:4rem;font-weight:900;color:var(--primary)}.score-label{text-transform:uppercase;font-weight:800;letter-spacing:.1em;color:var(--text-muted)}.result-actions-top{display:flex;gap:1rem}.report-error{background:#fef2f2;color:#991b1b;border:1px solid #fecaca;border-radius:12px;padding:.9rem 1rem;font-size:.95rem}.report-box{background:#fff;border-radius:16px;border:1px solid var(--border);box-shadow:var(--shadow-md);padding:1.25rem}.report-content{margin-top:.8rem;white-space:pre-wrap;line-height:1.7;font-size:.98rem;color:var(--text-main)}.explanations-section h2{margin-bottom:1.5rem}.explanations-list{display:flex;flex-direction:column;gap:1.5rem}.explanation-card{background:#fff;border-radius:var(--radius);padding:1.5rem;box-shadow:var(--shadow-md);border-left:6px solid #cbd5e1}.explanation-card.correct{border-left-color:#4caf50}.explanation-card.incorrect{border-left-color:#f44336}.status-info{display:flex;align-items:center;gap:1rem;margin-bottom:1rem}.question-number{font-weight:800}.sentence-block{margin-bottom:1rem}.sentence-block label{font-size:.75rem;font-weight:800;text-transform:uppercase;color:var(--text-muted);display:block;margin-bottom:.25rem}.korean-text{font-size:1.2rem;font-weight:700;color:var(--text-main)}.explanation-block{background:#f8fafc;padding:1rem;border-radius:12px;margin-top:1rem}.text-button{background:none;border:none;color:var(--text-muted);font-weight:600;cursor:pointer}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes slideIn{0%{opacity:0;transform:translate(20px)}to{opacity:1;transform:translate(0)}}@media(max-width:640px){.hero-title{font-size:2.25rem}.category-grid{grid-template-columns:1fr}.voice-selector{flex-direction:column}}