:root {
    --bg-main: #FFFBF0;
    --text-black: #2A2420;
    --surface-white: #FFFFFF;
    
    /* 카드 색상 */
    --card-pink: #FFB7B7;
    --card-orange: #FFD1A1;
    --card-yellow: #FFF5A1;
    --card-green: #B7FFB7;
    --card-blue: #A1E9FF;
    --card-purple: #D1B7FF;
    
    --border-width: 3px;
    --hard-shadow: 6px 6px 0px var(--text-black);
    --spring-transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

[data-theme="dark"] {
    --bg-main: #1A1614;
    --text-black: #F5F0EB;
    --surface-white: #2A2420;
    
    --card-pink: #D18585;
    --card-orange: #D19F6B;
    --card-yellow: #D1C56B;
    --card-green: #85D185;
    --card-blue: #6BAFD1;
    --card-purple: #9F85D1;
}

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

body {
    font-family: 'Fredoka', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-black);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* --- Category Navigation --- */
.category-nav {
    width: 100%;
    background: var(--surface-white);
    padding: 1rem;
    display: flex;
    justify-content: space-between; /* 양 끝 정렬 */
    align-items: center;
    gap: 1rem;
    border-bottom: var(--border-width) solid var(--text-black);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-links {
    display: flex;
    gap: 1rem;
}

.nav-spacer {
    flex-grow: 1; /* 중간 공간을 다 차지해서 테마 버튼을 오른쪽 끝으로 밀어냄 */
}

.nav-btn {
    padding: 0.8rem 1.2rem;
    font-family: inherit;
    font-weight: 700;
    font-size: 1.1rem;
    background: var(--surface-white);
    color: var(--text-black);
    border: var(--border-width) solid var(--text-black);
    border-radius: 15px;
    cursor: pointer;
    transition: var(--spring-transition);
    box-shadow: 4px 4px 0px var(--text-black);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-btn {
    padding: 0.8rem;
    min-width: 55px;
    background: var(--surface-white);
}

.nav-btn:hover {
    transform: translate(-2px, -2px);
    box-shadow: 6px 6px 0px var(--text-black);
}

.nav-btn.active {
    background: var(--card-yellow);
    color: #2A2420;
    transform: translate(2px, 2px);
    box-shadow: 0px 0px 0px var(--text-black);
}

.app-container {
    width: 100%;
    max-width: 900px;
    padding: 4rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 4.5rem;
}

main {
    display: flex;
    flex-direction: column;
    gap: 5rem;
}

@keyframes fadeInPop {
    0% { opacity: 0; transform: scale(0.5) translateY(20px); }
    100% { opacity: 1; transform: scale(1) translateY(0); }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

@keyframes jelly {
    0% { transform: scale(1, 1); }
    30% { transform: scale(1.2, 0.8); }
    40% { transform: scale(0.8, 1.2); }
    100% { transform: scale(1, 1); }
}

header {
    text-align: center;
}

.logo .icon {
    font-size: 4rem;
    display: inline-block;
    animation: float 4s ease-in-out infinite;
}

h1 {
    font-size: 4rem;
    font-weight: 700;
    color: var(--text-black);
    letter-spacing: -2px;
}

.subtitle {
    font-size: 1.3rem;
    font-weight: 500;
    background: var(--surface-white);
    padding: 0.3rem 1rem;
    border: 2px solid var(--text-black);
    border-radius: 12px;
    display: inline-block;
}

.animal-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 1.2rem;
    justify-content: center;
}

.animal-btn {
    background: var(--surface-white);
    color: var(--text-black);
    border: var(--border-width) solid var(--text-black);
    box-shadow: 4px 4px 0px var(--text-black);
    padding: 1.2rem;
    border-radius: 20px;
    cursor: pointer;
    transition: var(--spring-transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 110px;
}

.animal-btn .emoji { font-size: 3rem; }

.animal-btn:hover {
    transform: translate(-2px, -2px);
    box-shadow: 6px 6px 0px var(--text-black);
    background: var(--card-blue);
}

.animal-btn:active, .animal-btn.active {
    transform: translate(2px, 2px);
    box-shadow: 0px 0px 0px var(--text-black);
    background: var(--card-purple);
    color: #2A2420;
}

.results-section {
    background: var(--bg-main);
    padding: 3rem 2rem;
    border-radius: 40px;
    border: var(--border-width) solid var(--text-black);
    box-shadow: var(--hard-shadow);
}

.selected-animal-header {
    text-align: center;
    margin-bottom: 3rem;
}

.selected-animal-header .main-icon {
    font-size: 6rem;
    display: inline-block;
    animation: float 3.5s ease-in-out infinite;
}

.selected-animal-header h2 {
    font-size: 2.8rem;
    background: var(--surface-white);
    padding: 0.5rem 2rem;
    border: 3px solid var(--text-black);
    border-radius: 100px;
    display: inline-block;
}

.sounds-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.sound-card {
    border: var(--border-width) solid var(--text-black);
    border-radius: 24px;
    padding: 1.8rem;
    cursor: pointer;
    transition: var(--spring-transition);
    box-shadow: var(--hard-shadow);
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    position: relative;
    overflow: hidden;
    color: #2A2420; /* 카드는 항상 어두운 글씨로 가독성 확보 */
}

.sound-card:nth-child(6n+1) { background: var(--card-green); }
.sound-card:nth-child(6n+2) { background: var(--card-pink); }
.sound-card:nth-child(6n+3) { background: var(--card-blue); }
.sound-card:nth-child(6n+4) { background: var(--card-yellow); }
.sound-card:nth-child(6n+5) { background: var(--card-orange); }
.sound-child(6n+6) { background: var(--card-purple); }

.sound-card:hover {
    transform: translate(-4px, -4px) scale(1.02);
    box-shadow: 10px 10px 0px var(--text-black);
}

.sound-card.playing {
    animation: jelly 0.6s ease infinite;
    transform: translate(2px, 2px);
    box-shadow: 2px 2px 0px var(--text-black);
    background: white !important;
}

.card-header {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    border-bottom: 2px solid var(--text-black);
    padding-bottom: 0.8rem;
}

.card-header .country {
    font-weight: 700;
    font-size: 1.2rem;
}

.card-body {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
}

.sound-word {
    font-size: 2.8rem;
    font-weight: 800;
    text-align: center;
    line-height: 1.2;
    white-space: nowrap;
    width: 100%;
    overflow: hidden;
}

.pronunciation {
    font-size: 1.1rem;
    background: var(--surface-white);
    color: var(--text-black);
    padding: 0.8rem 1rem;
    border: 2px solid var(--text-black);
    border-radius: 14px;
    text-align: center;
    font-weight: 600;
    width: 100%;
}

/* --- Quiz Section --- */
.quiz-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    animation: fadeInDown 0.5s ease-out;
}

.quiz-card {
    width: 100%;
    max-width: 600px;
    background: var(--surface-white);
    border: var(--border-width) solid var(--text-black);
    border-radius: 40px;
    padding: 3rem;
    box-shadow: var(--hard-shadow);
    text-align: center;
}

.quiz-emoji {
    font-size: 5rem;
    display: block;
    margin-bottom: 1rem;
    animation: float 3s ease-in-out infinite;
}

.quiz-header h3 {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
}

.quiz-play-area {
    margin: 2.5rem 0;
}

.replay-btn {
    padding: 1rem 2rem;
    font-family: inherit;
    font-weight: 800;
    font-size: 1.2rem;
    background: var(--card-blue);
    border: var(--border-width) solid var(--text-black);
    border-radius: 15px;
    cursor: pointer;
    box-shadow: 4px 4px 0px var(--text-black);
    transition: var(--spring-transition);
}

.replay-btn:hover {
    transform: translate(-2px, -2px);
    box-shadow: 6px 6px 0px var(--text-black);
}

.quiz-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.2rem;
}

.option-btn {
    padding: 1.2rem;
    background: var(--surface-white);
    border: var(--border-width) solid var(--text-black);
    border-radius: 20px;
    cursor: pointer;
    transition: var(--spring-transition);
    box-shadow: 4px 4px 0px var(--text-black);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    font-family: inherit;
    font-weight: 700;
    font-size: 1rem;
}

.option-btn:hover {
    transform: translate(-2px, -2px);
    box-shadow: 6px 6px 0px var(--text-black);
}

.option-btn.correct {
    background: var(--card-green) !important;
    animation: jelly 0.5s ease;
}

.option-btn.wrong {
    background: var(--card-pink) !important;
    transform: translateX(5px);
}

.quiz-feedback {
    margin-top: 2rem;
    font-weight: 800;
    font-size: 1.5rem;
    min-height: 2rem;
}

/* --- Info Section --- */
.info-section {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
    margin-top: 2rem;
}

.info-card {
    background: var(--surface-white);
    border: var(--border-width) solid var(--text-black);
    border-radius: 30px;
    padding: 2.5rem;
    box-shadow: var(--hard-shadow);
}

.info-card.alternate {
    background: var(--card-blue);
}

[data-theme="dark"] .info-card.alternate {
    background: var(--card-blue);
    color: #2A2420; /* 다크모드에서도 이 카드는 읽기 쉽게 고정 */
}

.info-card h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--text-black);
}

[data-theme="dark"] .info-card.alternate h3 {
    color: #2A2420;
}

.info-card p {
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 1rem;
}

.info-card ul {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.info-card li {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

footer {
    text-align: center;
    font-weight: 700;
    padding: 2rem 0;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-nav {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

.footer-link {
    color: var(--text-black);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 0.5rem 1rem;
    background: var(--surface-white);
    border: 2px solid var(--text-black);
    border-radius: 10px;
    box-shadow: 3px 3px 0px var(--text-black);
    transition: var(--spring-transition);
}

.footer-link:hover {
    transform: translate(-2px, -2px);
    box-shadow: 5px 5px 0px var(--text-black);
    background: var(--card-blue);
}

.footer-link:active {
    transform: translate(1px, 1px);
    box-shadow: 0px 0px 0px var(--text-black);
}

@media (max-width: 600px) {
    h1 { font-size: 2.8rem; }
    
    .category-nav {
        padding: 0.8rem;
        gap: 0.5rem;
    }

    .nav-links {
        gap: 0.5rem;
    }

    .nav-btn {
        padding: 0.6rem 0.8rem;
        font-size: 0.9rem;
    }

    .theme-btn {
        padding: 0.6rem;
        min-width: 45px;
    }
    
    .app-container {
        padding: 2rem 1rem;
        gap: 3rem;
    }

    main {
        gap: 3rem;
    }

    .animal-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 0.8rem;
    }

    .animal-btn {
        min-width: unset;
        padding: 0.8rem 0.5rem;
    }

    .animal-btn .emoji { font-size: 2.2rem; }
    .animal-btn .name { font-size: 0.9rem; }

    .selected-animal-header .main-icon {
        font-size: 4.5rem;
    }

    .selected-animal-header h2 {
        font-size: 2rem;
    }

    .sounds-grid { 
        grid-template-columns: 1fr; 
        gap: 1.2rem;
    }

    .theme-toggle {
        top: 0.8rem;
        right: 0.8rem;
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }
}