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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    min-height: 100vh;
    color: #fff;
}

/* 헤더 */
header {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

header h1 {
    text-align: center;
    margin-bottom: 1rem;
    font-size: 1.8rem;
    background: linear-gradient(90deg, #FF6B6B, #4ECDC4, #FFD93D);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

nav {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.nav-btn {
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 25px;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.nav-btn.active {
    background: linear-gradient(135deg, #FF6B6B, #FF8E53);
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.4);
}

/* 메인 */
main {
    max-width: 1600px;
    margin: 0 auto;
    padding: 1rem 2rem;
}

.section {
    display: none;
}

.section.active {
    display: block;
}

/* 2분할 레이아웃 */
.split-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    align-items: start;
}

@media (max-width: 1200px) {
    .split-layout {
        grid-template-columns: 1fr;
    }
}

/* 컨트롤 */
.controls {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    padding: 1rem 1.5rem;
    margin-bottom: 1rem;
}

.controls h2 {
    text-align: center;
    margin-bottom: 1rem;
    color: #4ECDC4;
}

.toggle-container {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.toggle-btn {
    padding: 1rem 2rem;
    border: 2px solid transparent;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.1rem;
    font-weight: bold;
}

.toggle-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.toggle-btn.active[data-mode="elnino"] {
    background: linear-gradient(135deg, #FF6B6B, #FF8E53);
    border-color: #FF6B6B;
    box-shadow: 0 4px 20px rgba(255, 107, 107, 0.5);
}

.toggle-btn.active[data-mode="lanina"] {
    background: linear-gradient(135deg, #4ECDC4, #2C7DA0);
    border-color: #4ECDC4;
    box-shadow: 0 4px 20px rgba(78, 205, 196, 0.5);
}

.toggle-btn.active[data-mode="normal"] {
    background: linear-gradient(135deg, #6c757d, #495057);
    border-color: #6c757d;
    box-shadow: 0 4px 20px rgba(108, 117, 125, 0.5);
}

/* 다이어그램 컨테이너 */
.diagram-container {
    background: white;
    border-radius: 15px;
    padding: 0.5rem;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    height: fit-content;
}

#ocean-diagram {
    width: 100%;
    height: auto;
    display: block;
}

/* SVG 텍스트 스타일 */
.region-label {
    font-size: 18px;
    font-weight: bold;
    fill: #1A4B6E;
    text-anchor: middle;
}

.pressure-text {
    font-size: 14px;
    fill: #5D7B93;
    text-anchor: middle;
}

.layer-label {
    font-size: 14px;
    font-weight: bold;
}

.temp-label {
    font-size: 16px;
    font-weight: bold;
}

.wind-label {
    font-size: 14px;
    text-anchor: middle;
}

.upwelling-label {
    font-size: 12px;
    font-weight: bold;
}

.legend-text {
    font-size: 12px;
    fill: #333;
}

/* 정보 패널 */
.info-panel {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    padding: 1rem 1.5rem;
    height: fit-content;
    max-height: calc(100vh - 200px);
    overflow-y: auto;
}

.info-panel h3 {
    color: #FFD93D;
    margin-bottom: 0.8rem;
    text-align: center;
    font-size: 1.1rem;
}

#phenomenon-description {
    text-align: center;
    margin-bottom: 1rem;
    line-height: 1.5;
    color: #ccc;
    font-size: 0.9rem;
}

/* 비교 테이블 */
.comparison-table {
    overflow-x: auto;
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    overflow: hidden;
}

.comparison-table th,
.comparison-table td {
    padding: 0.6rem 0.8rem;
    text-align: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
}

.comparison-table th {
    background: rgba(255, 255, 255, 0.1);
    color: #4ECDC4;
    font-weight: bold;
}

.comparison-table td {
    color: #fff;
}

.comparison-table tr:last-child td {
    border-bottom: none;
}

.increase {
    color: #FF6B6B !important;
    font-weight: bold;
}

.decrease {
    color: #4ECDC4 !important;
    font-weight: bold;
}

.strong {
    color: #FFD93D !important;
    font-weight: bold;
}

.weak {
    color: #9B9B9B !important;
}

/* 밀란코비치 컨트롤 */
.milankovitch-controls {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

@media (max-width: 900px) {
    .milankovitch-controls {
        grid-template-columns: 1fr;
    }
}

.control-group {
    background: rgba(255, 255, 255, 0.05);
    padding: 0.8rem;
    border-radius: 10px;
}

.control-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: #FFD93D;
    font-weight: bold;
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.slider-container span {
    font-size: 0.9rem;
    color: #aaa;
    white-space: nowrap;
}

.slider-container input[type="range"] {
    flex: 1;
    height: 8px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.2);
    outline: none;
    -webkit-appearance: none;
}

.slider-container input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, #4ECDC4, #2C7DA0);
    cursor: pointer;
    box-shadow: 0 2px 10px rgba(78, 205, 196, 0.5);
}

.value-display {
    text-align: center;
    margin-top: 0.5rem;
    color: #4ECDC4;
    font-weight: bold;
}

/* 밀란코비치 다이어그램 */
.milankovitch-diagram {
    background: #0a0a20;
}

#orbit-diagram {
    width: 100%;
    height: auto;
}

/* 밀란코비치 정보 */
.milankovitch-info .status-box,
.milankovitch-info .temp-box {
    background: rgba(255, 255, 255, 0.05);
    padding: 0.8rem 1rem;
    border-radius: 10px;
    margin-bottom: 1rem;
}

.milankovitch-info .status-box p,
.milankovitch-info .temp-box p {
    margin: 0.4rem 0;
    font-size: 0.9rem;
    color: #ccc;
}

.milankovitch-info .temp-summer {
    color: #FF6B6B !important;
}

.milankovitch-info .temp-winter {
    color: #4ECDC4 !important;
}

.milankovitch-info .temp-range {
    color: #FFD93D !important;
}

.milankovitch-info .cycle-explanation {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.cycle-item {
    background: rgba(255, 255, 255, 0.05);
    padding: 0.6rem 1rem;
    border-radius: 8px;
    border-left: 3px solid #4ECDC4;
}

.cycle-item h4 {
    color: #FFD93D;
    margin-bottom: 0.3rem;
    font-size: 0.95rem;
}

.cycle-item p {
    color: #aaa;
    font-size: 0.8rem;
    line-height: 1.4;
    margin: 0;
}

/* 세차운동 3D 섹션 */
.precession-3d-container {
    display: flex;
    flex-direction: column;
}

.precession-3d-container h3 {
    color: #4ECDC4;
    margin-bottom: 0.5rem;
    text-align: center;
}

.precession-container {
    position: relative;
    width: 100%;
    height: 400px;
    min-height: 350px;
    background: #000;
    border-radius: 15px;
    overflow: hidden;
}

.orbit-info-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

#precession-canvas {
    width: 100%;
    height: 100%;
}

#precession-canvas canvas {
    width: 100% !important;
    height: 100% !important;
}

#precession-ui {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
}

.precession-info-text {
    text-align: center;
    background: rgba(0, 0, 0, 0.6);
    padding: 8px 15px;
    border-radius: 8px;
}

.precession-info-text p {
    color: #aaa;
    font-size: 12px;
    margin: 3px 0;
}

/* 과장된 버전용 캔버스 */
#precession-canvas-ex {
    width: 100%;
    height: 100%;
}

#precession-canvas-ex canvas {
    width: 100% !important;
    height: 100% !important;
}

#precession-ui-ex {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
}

/* 과장된 버전 경고 */
.extreme-warning {
    background: linear-gradient(135deg, #ff6b6b33, #ff8e5333);
    border: 2px solid #ff6b6b;
    border-radius: 10px;
    padding: 0.8rem 1.5rem;
    margin-bottom: 1rem;
    text-align: center;
    color: #FFD93D;
    font-weight: bold;
    font-size: 0.95rem;
}

/* 과장된 컨트롤 하이라이트 */
.extreme-control {
    border: 2px solid #ff6b6b;
    background: rgba(255, 107, 107, 0.1) !important;
}

.extreme-control label {
    color: #FF6B6B !important;
}

/* 퀴즈 섹션 */
.quiz-container {
    max-width: 700px;
    margin: 0 auto;
}

.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.quiz-header h2 {
    color: #4ECDC4;
}

.quiz-controls {
    display: flex;
    gap: 1rem;
}

.quiz-controls select {
    padding: 0.5rem 1rem;
    border-radius: 8px;
    border: none;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 1rem;
    cursor: pointer;
}

.quiz-controls select option {
    background: #1a1a2e;
    color: white;
}

.btn {
    padding: 0.5rem 1.5rem;
    border: none;
    border-radius: 8px;
    background: linear-gradient(135deg, #4ECDC4, #2C7DA0);
    color: white;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(78, 205, 196, 0.4);
}

.quiz-progress {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
}

.quiz-progress span {
    color: #FFD93D;
    font-weight: bold;
}

.quiz-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    padding: 2rem;
    margin-bottom: 2rem;
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.question-number {
    color: #4ECDC4;
    font-size: 0.9rem;
}

/* 타이머 */
.timer-display {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    background: rgba(0, 0, 0, 0.3);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

.timer-bar {
    width: 80px;
    height: 8px;
    background: linear-gradient(90deg, #4ECDC4, #2C7DA0);
    border-radius: 4px;
    transition: width 0.3s ease;
}

.timer-bar.warning {
    background: linear-gradient(90deg, #FFD93D, #FF8E53);
}

.timer-bar.danger {
    background: linear-gradient(90deg, #FF6B6B, #FF4444);
    animation: pulse-timer 0.5s ease infinite;
}

@keyframes pulse-timer {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.timer-text {
    font-size: 1.2rem;
    font-weight: bold;
    color: #FFD93D;
    min-width: 25px;
    text-align: center;
}

.question-text {
    font-size: 1.3rem;
    line-height: 1.6;
    margin-bottom: 2rem;
    min-height: 80px;
}

.answer-buttons {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

.answer-btn {
    padding: 1.5rem 3rem;
    font-size: 1.5rem;
    border: 3px solid transparent;
    border-radius: 15px;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
}

.answer-btn:hover:not(:disabled) {
    transform: scale(1.05);
}

.answer-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

#btn-o:hover:not(:disabled) {
    background: rgba(78, 205, 196, 0.3);
    border-color: #4ECDC4;
}

#btn-x:hover:not(:disabled) {
    background: rgba(255, 107, 107, 0.3);
    border-color: #FF6B6B;
}

.answer-btn.correct {
    background: rgba(78, 205, 196, 0.5);
    border-color: #4ECDC4;
    animation: pulse 0.5s ease;
}

.answer-btn.incorrect {
    background: rgba(255, 107, 107, 0.5);
    border-color: #FF6B6B;
    animation: shake 0.5s ease;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

.feedback {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: 1rem;
    min-height: 40px;
}

.feedback.correct {
    color: #4ECDC4;
}

.feedback.incorrect {
    color: #FF6B6B;
}

.feedback.timeout {
    color: #FF8E53;
}

.explanation {
    background: rgba(255, 255, 255, 0.05);
    padding: 1rem;
    border-radius: 10px;
    color: #ccc;
    line-height: 1.5;
    min-height: 50px;
    display: none;
}

.explanation.show {
    display: block;
}

/* 퀴즈 기록 */
.quiz-history {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    padding: 1.5rem;
}

.quiz-history h3 {
    color: #FFD93D;
    margin-bottom: 1rem;
}

#history-list {
    max-height: 200px;
    overflow-y: auto;
}

.history-item {
    padding: 0.5rem;
    margin-bottom: 0.5rem;
    border-radius: 8px;
    font-size: 0.9rem;
}

.history-item.correct {
    background: rgba(78, 205, 196, 0.2);
    border-left: 3px solid #4ECDC4;
}

.history-item.incorrect {
    background: rgba(255, 107, 107, 0.2);
    border-left: 3px solid #FF6B6B;
}

/* 퀴즈 설정 화면 */
.quiz-setup {
    text-align: center;
}

.quiz-setup h2 {
    color: #4ECDC4;
    margin-bottom: 2rem;
    font-size: 2rem;
}

.setup-form {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    padding: 2rem;
    max-width: 500px;
    margin: 0 auto;
}

.setup-group {
    margin-bottom: 1.5rem;
}

.setup-group label {
    display: block;
    color: #FFD93D;
    margin-bottom: 0.8rem;
    font-weight: bold;
    font-size: 1.1rem;
}

.setup-group select {
    width: 100%;
    padding: 0.8rem 1rem;
    border-radius: 8px;
    border: 2px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 1rem;
    cursor: pointer;
}

.setup-group select option {
    background: #1a1a2e;
    color: white;
}

.question-count-options {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.8rem;
}

.count-btn {
    padding: 0.8rem 1rem;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.05);
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

.count-btn:hover {
    border-color: #4ECDC4;
    background: rgba(78, 205, 196, 0.2);
}

.count-btn.active {
    border-color: #4ECDC4;
    background: rgba(78, 205, 196, 0.3);
    color: #4ECDC4;
    font-weight: bold;
}

/* 시간 제한 버튼 */
.time-limit-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.8rem;
}

.time-btn {
    padding: 0.8rem 1rem;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.05);
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

.time-btn:hover {
    border-color: #FF8E53;
    background: rgba(255, 142, 83, 0.2);
}

.time-btn.active {
    border-color: #FF8E53;
    background: rgba(255, 142, 83, 0.3);
    color: #FF8E53;
    font-weight: bold;
}

.start-btn {
    margin-top: 1.5rem;
    padding: 1rem 3rem;
    font-size: 1.2rem;
    background: linear-gradient(135deg, #FF6B6B, #FF8E53);
}

.start-btn:hover {
    box-shadow: 0 4px 20px rgba(255, 107, 107, 0.5);
}

/* 퀴즈 진행 화면 */
.quiz-play .quiz-header {
    flex-direction: column;
    align-items: stretch;
}

.quiz-play .quiz-header h2 {
    text-align: center;
    margin-bottom: 1rem;
}

.quiz-progress-bar {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #4ECDC4, #2C7DA0);
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 0%;
}

.next-btn {
    display: block;
    width: 100%;
    max-width: 300px;
    margin: 0 auto;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    background: linear-gradient(135deg, #4ECDC4, #2C7DA0);
}

/* 결과 화면 */
.quiz-result {
    text-align: center;
}

.quiz-result h2 {
    color: #4ECDC4;
    margin-bottom: 2rem;
    font-size: 2rem;
}

.result-score-container {
    display: flex;
    justify-content: center;
    align-items: baseline;
    margin-bottom: 2rem;
}

.result-score {
    font-size: 6rem;
    font-weight: bold;
    background: linear-gradient(135deg, #FFD93D, #FF8E53);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.result-score-label {
    font-size: 2rem;
    color: #FFD93D;
    margin-left: 0.5rem;
}

.result-details {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.result-item {
    background: rgba(255, 255, 255, 0.05);
    padding: 1rem 2rem;
    border-radius: 10px;
    min-width: 100px;
}

.result-label {
    display: block;
    color: #aaa;
    font-size: 0.9rem;
    margin-bottom: 0.3rem;
}

.result-value {
    display: block;
    font-size: 1.8rem;
    font-weight: bold;
    color: #FFD93D;
}

.result-message {
    font-size: 1.2rem;
    color: #ccc;
    margin-bottom: 2rem;
}

.result-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.result-buttons .btn {
    padding: 1rem 2rem;
    font-size: 1rem;
}

#retry-quiz-btn {
    background: linear-gradient(135deg, #4ECDC4, #2C7DA0);
}

#new-quiz-setup-btn {
    background: linear-gradient(135deg, #FF6B6B, #FF8E53);
}

/* 푸터 */
footer {
    text-align: center;
    padding: 2rem;
    color: #666;
}

/* 반응형 */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.4rem;
    }

    .nav-btn {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }

    main {
        padding: 1rem;
    }

    .toggle-btn {
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
    }

    .question-text {
        font-size: 1.1rem;
    }

    .answer-btn {
        padding: 1rem 2rem;
        font-size: 1.2rem;
    }

    .quiz-header {
        flex-direction: column;
        text-align: center;
    }
}

/* 비 애니메이션 */
.rain-drop {
    animation: rainFall 1s linear infinite;
}

@keyframes rainFall {
    0% {
        transform: translateY(0);
        opacity: 1;
    }
    100% {
        transform: translateY(80px);
        opacity: 0;
    }
}

/* 구름 애니메이션 */
.cloud-group {
    transition: all 0.8s ease;
}

/* 용승 애니메이션 */
#upwelling-arrow {
    transition: all 0.8s ease;
}

/* 무역풍 애니메이션 */
#trade-winds line {
    transition: all 0.8s ease;
}

/* 해수층 애니메이션 */
#warm-layer-west,
#warm-layer-east,
#cold-layer {
    transition: all 0.8s ease;
}