*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}

:root{

    --primary:#2563eb;
    --primary-dark:#1d4ed8;

    --success:#16a34a;
    --danger:#dc2626;

    --background:#f5f7fb;

    --card:#ffffff;

    --text:#111827;

    --subtext:#6b7280;

}

body{

    font-family:
    "Pretendard",
    "Noto Sans KR",
    sans-serif;

    background:var(--background);

    color:var(--text);

    min-height:100vh;

}

.container{

    width:100%;

    max-width:900px;

    margin:auto;

    padding:20px;

}

.screen{

    display:none;

}

.screen.active{

    display:block;

}

/* 카드 공통 */

.hero-card,
.quiz-card,
.result-card{

    background:var(--card);

    border-radius:24px;

    padding:40px;

    margin-top:40px;

    box-shadow:
    0 10px 30px rgba(0,0,0,.08);

}

/* 홈 화면 */

.logo{

    font-size:4rem;

    text-align:center;

    margin-bottom:10px;

}

h1{

    text-align:center;

    font-size:2.2rem;

    margin-bottom:10px;

}

.subtitle{

    text-align:center;

    color:var(--subtext);

    margin-bottom:30px;

}

/* 통계 */

.stats{

    display:grid;

    grid-template-columns:1fr 1fr;

    gap:15px;

    margin-bottom:25px;

}

.stat-box{

    background:#f3f4f6;

    padding:20px;

    border-radius:16px;

    text-align:center;

}

.stat-box span{

    display:block;

    color:var(--subtext);

    margin-bottom:10px;

}

.stat-box strong{

    font-size:1.3rem;

}

/* 버튼 */

.primary-btn{

    width:100%;

    border:none;

    border-radius:16px;

    padding:18px;

    background:var(--primary);

    color:white;

    font-size:1.05rem;

    font-weight:700;

    cursor:pointer;

    transition:.2s;

}

.primary-btn:hover{

    background:var(--primary-dark);

    transform:translateY(-2px);

}

.secondary-btn{

    width:100%;

    border:none;

    border-radius:16px;

    padding:18px;

    background:#10b981;

    color:white;

    font-size:1rem;

    font-weight:700;

    cursor:pointer;

    transition:.2s;

}

.secondary-btn:hover{

    transform:translateY(-2px);

}

/* 결과 화면 */

.score-display{

    text-align:center;

    font-size:3rem;

    font-weight:800;

    margin-top:20px;

}

.grade-card{

    margin-top:20px;

    background:#eff6ff;

    border-radius:18px;

    padding:20px;

    text-align:center;

    font-size:1.2rem;

    font-weight:700;

}

.result-actions{

    display:flex;

    flex-direction:column;

    gap:12px;

    margin-top:25px;

}

/* 애니메이션 */

.hero-card,
.quiz-card,
.result-card{

    animation:fadeUp .4s ease;

}

@keyframes fadeUp{

    from{

        opacity:0;

        transform:translateY(20px);

    }

    to{

        opacity:1;

        transform:translateY(0);

    }

}

/* 모바일 */

@media(max-width:768px){

    .container{

        padding:12px;

    }

    .hero-card,
    .quiz-card,
    .result-card{

        padding:24px;

        margin-top:20px;

    }

    h1{

        font-size:1.8rem;

    }

    .stats{

        grid-template-columns:1fr;

    }

    .score-display{

        font-size:2.3rem;

    }

}
.wrong-question-card{

    margin-top:15px;

    padding:18px;

    border-radius:16px;

    background:#f9fafb;

    border:1px solid #e5e7eb;

}

.wrong-question-card h3{

    margin-bottom:10px;

    font-size:1rem;

}

.wrong-question-card p{

    margin-top:8px;

    line-height:1.6;

}
.category-select-box{

    margin-bottom:20px;

}

.category-select-box label{

    display:block;

    margin-bottom:8px;

    font-weight:700;

}

#category-select{

    width:100%;

    padding:14px;

    border-radius:12px;

    border:1px solid #d1d5db;

    font-size:1rem;

    background:white;

}

.site-footer{

    margin-top:40px;

    padding:20px;

    text-align:center;

    font-size:14px;

}

.site-footer a{

    margin:0 10px;

    text-decoration:none;

}
.container p{

    margin-bottom:16px;

}
#start-btn{
    margin-bottom:16px;
}

#analysis-btn{

    margin-top:16px;

}