/* 1. Font Definition */
@font-face {
    font-family: 'Paperlogy';
    src: url('fonts/Paperlogy.woff2') format('woff2');
    font-weight: normal;
    font-style: normal;
}

@font-face {
    font-family: 'Pretendard';
    src: url('fonts/PretendardVariable.woff2') format('woff2-variations');
    font-weight: 400 700;
}

/* 2. Color Themes (CSS Variables) */
body[data-theme="aetherial-light"] {
    --color-background: #FDFEFF;
    --color-surface: #FFFFFF;
    --color-text-primary: #343A40;
    --color-text-secondary: #6C757D;
    --color-border: #E3E8EC;
    --color-accent: #86B3D1;
    --color-accent-darker: #6A9FB9;
    --color-card-bg: #F8F9FA;
    --color-button-active-bg: #E9ECEF;
    --color-candle-up: #63C0A3;
    --color-candle-down: #D1A0A2;
    --color-future-candle-up: #28a745;
    --color-future-candle-down: #dc3545;
    --color-overlay-bg: rgba(248, 249, 250, 0.7);
    --color-annotation-bg: rgba(108, 117, 125, 0.1);
}

body[data-theme="nordic-noir"] {
    --color-background: #2E3440;
    --color-surface: #3B4252;
    --color-text-primary: #ECEFF4;
    --color-text-secondary: #D8DEE9;
    --color-border: #4C566A;
    --color-accent: #88C0D0;
    --color-accent-darker: #B4E5F3;
    --color-card-bg: #292E39;
    --color-button-active-bg: #292E39;
    --color-candle-up: #A3BE8C;
    --color-candle-down: #BF616A;
    --color-future-candle-up: #20c997;
    --color-future-candle-down: #e85969;
    --color-overlay-bg: rgba(41, 46, 57, 0.7);
    --color-annotation-bg: rgba(216, 222, 233, 0.1);
}

/* 3. Global Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

html, body {
    height: 100%;
}

body {
    font-family: 'Pretendard', sans-serif;
    background-color: var(--color-background);
    color: var(--color-text-primary);
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s, color 0.3s;
}

.content-wrapper {
    flex-grow: 1;
}

main {
    min-height: calc(100vh - 122px); /* 헤더, 푸터 높이를 뺀 최소 높이 확보 */
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    width: 100%;
}

/* 4. Layout Components (Header, Footer, Disclaimer) */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    flex-shrink: 0;
    width: 100%;
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-surface);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    flex-shrink: 0;
    width: 100%;
    border-top: 1px solid var(--color-border);
    background-color: var(--color-surface);
    position: sticky;
    bottom: 0;
    z-index: 100;
}

.site-title {
    font-family: 'Paperlogy', sans-serif;
    font-size: 2rem;
    font-weight: normal;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.language-switcher {
    display: flex;
    gap: 0.5rem;
}

.language-switcher button {
    background: none;
    border: 2px solid transparent;
    border-radius: 50%;
    cursor: pointer;
    padding: 0;
    line-height: 0;
    opacity: 0.7;
    transition: opacity 0.2s, border-color 0.2s;
    width: 32px;
    height: 32px;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}
.language-switcher button svg {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.language-switcher button.active,
.language-switcher button:hover {
    opacity: 1;
}
.language-switcher button.active {
    border-color: var(--color-accent);
}

.icon-btn {
    color: var(--color-text-secondary);
    opacity: 0.8;
    transition: opacity 0.2s, color 0.2s;
    line-height: 0;
    background: none;
    border: none;
    cursor: pointer;
}
.icon-btn:hover {
    opacity: 1;
    color: var(--color-text-primary);
}

.disclaimer-main {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    margin-top: 1.5rem;
    max-width: 900px;
    text-align: justify;
}

.copyright {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
}

/* [핵심 추가] 푸터의 저작권 링크 스타일 */
.copyright a {
    color: inherit; /* 부모 요소의 색상을 그대로 사용 */
    text-decoration: none; /* 밑줄 제거 */
    transition: color 0.2s, text-decoration 0.2s;
}

.copyright a:hover {
    color: var(--color-text-primary); /* 마우스를 올리면 주요 텍스트 색상으로 변경 */
    text-decoration: underline; /* 마우스를 올리면 밑줄 표시 */
}


.theme-switcher {
    display: flex;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    overflow: hidden;
    background-color: var(--color-background);
    transition: background-color 0.2s, border-color 0.2s;
}

.theme-btn {
    height: 38px;
    background-color: transparent;
    border: none;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0 15px;
    transition: background-color 0.2s;
}

.theme-btn:first-child { 
    border-right: 1px solid var(--color-border); 
    transition: border-color 0.2s;
}

.theme-btn.active { 
    background-color: var(--color-button-active-bg); 
}

.theme-btn .color-patch {
    width: 16px;
    height: 16px;
    border-radius: 4px;
    border: 1px solid var(--color-border);
    transition: background-color 0.2s, border-color 0.2s;
}

.theme-btn[data-theme="aetherial-light"] .color-patch {
    background-color: #FDFEFF;
}

.theme-btn[data-theme="nordic-noir"] .color-patch {
    background-color: #2E3440;
}


/* 5. Main Prediction Window */
.prediction-window {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 2rem;
    width: 100%;
    max-width: 900px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.ticker-input-wrapper {
    display: flex;
    flex-direction: row; 
    align-items: center; 
    gap: 0.5rem;
}

#ticker-input {
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 0.8rem 1rem;
    font-size: 1rem;
    color: var(--color-text-primary);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    flex-grow: 1; 
}

#ticker-input:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-accent) 20%, transparent);
}

#model-select {
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 0.8rem 0.5rem;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    outline: none;
    cursor: pointer;
    transition: border-color 0.2s, box-shadow 0.2s;
    flex-shrink: 0;
}

#model-select:focus {
    border-color: var(--color-accent);
}

#fetch-chart-btn {
    padding: 0.5rem;
    border-radius: 50%;
    width: 42px;
    height: 42px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}
#fetch-chart-btn:hover {
    background-color: var(--color-button-active-bg);
}

.main-chart-wrapper {
    position: relative; /* 오버레이와 방향성 표시의 기준점 */
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    overflow: hidden;
    height: 400px; /* 전체 높이 고정 */
}

.chart-container {
    height: 280px;
}

.rsi-chart-container {
    height: 120px;
    border-top: 1px solid var(--color-border);
}

#main-candlestick-chart,
#main-rsi-chart {
    width: 100%;
}

.initial-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    transition: opacity 0.5s, visibility 0.5s;
    background-color: var(--color-overlay-bg);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    color: var(--color-text-secondary);
    z-index: 20;
    gap: 0.5rem;
}

.initial-overlay.hidden {
    opacity: 0;
    visibility: hidden;
}

.initial-overlay p {
    font-weight: 600;
}

.forecast-button {
    background-color: var(--color-accent);
    color: var(--color-background);
    border: none;
    border-radius: 8px;
    padding: 1rem;
    font-family: 'Paperlogy', sans-serif;
    font-size: 1.5rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

.forecast-button:hover {
    background-color: var(--color-accent-darker);
}

/* 6. Spinner Animation */
.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid color-mix(in srgb, var(--color-border) 50%, transparent);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* 7. Prediction Direction Display */
#prediction-direction-display {
    position: absolute;
    top: 1rem;
    right: 1rem;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    z-index: 15;
    transition: opacity 0.3s, background-color 0.3s, color 0.3s;
    opacity: 0;
    visibility: hidden;
}

#prediction-direction-display.visible {
    opacity: 1;
    visibility: visible;
}

#prediction-direction-display.up {
    background-color: color-mix(in srgb, var(--color-future-candle-up) 20%, transparent);
    color: var(--color-future-candle-up);
}

#prediction-direction-display.down {
    background-color: color-mix(in srgb, var(--color-future-candle-down) 20%, transparent);
    color: var(--color-future-candle-down);
}

#prediction-direction-display svg {
    width: 18px;
    height: 18px;
}

.hidden {
    display: none !important;
}


/* 8. About Section */
.scroll-indicator {
    margin-top: 2rem;
    color: var(--color-text-secondary);
    opacity: 0.5;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

.about-section {
    width: 100%;
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    margin-top: 4rem;
    padding: 4rem 2rem 6rem; /* 푸터 공간 확보를 위해 하단 패딩 추가 */
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
    color: var(--color-text-secondary);
}

.about-content h2,
.about-content h3,
.about-content h4 {
    color: var(--color-text-primary);
    margin-bottom: 1rem;
}

.about-content h2 {
    font-size: 2rem;
    font-family: 'Paperlogy', sans-serif;
    text-align: center;
    margin-bottom: 2.5rem;
}

.about-content h3 {
    font-size: 1.5rem;
    margin-top: 3rem;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0.5rem;
}

.about-content h4 {
    font-size: 1.1rem;
    margin-top: 2rem;
}

.about-content p {
    line-height: 1.8;
    text-align: justify;
}

.about-content strong {
    color: var(--color-text-primary);
    font-weight: 600;
}

.model-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.model-card {
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 1.5rem;
}

.model-card h4 {
    margin-top: 0;
}

.about-content table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
    font-size: 0.9rem;
}

.about-content th, 
.about-content td {
    border: 1px solid var(--color-border);
    padding: 0.8rem;
    text-align: left;
}

.about-content thead {
    background-color: var(--color-card-bg);
}
.about-content thead th {
    color: var(--color-text-primary);
    font-weight: 600;
}

.about-content tbody tr:nth-child(even) {
    background-color: var(--color-card-bg);
}

.about-content td strong {
    font-family: monospace;
}

/* 9. Responsive Design (Mobile) */
@media (max-width: 768px) {
    main {
        padding: 1rem;
        min-height: calc(100vh - 108px); /* 모바일 헤더/푸터 높이 재계산 */
    }

    header, footer {
        padding: 0.75rem 1rem;
    }

    .site-title {
        font-size: 1.5rem;
    }

    .prediction-window {
        padding: 1rem;
    }

    .ticker-input-wrapper {
        flex-wrap: wrap; /* 입력창과 버튼이 한 줄에 다 안들어가면 줄바꿈 */
    }

    #ticker-input {
        flex-basis: 100%; /* 너비 100% 차지 */
        margin-bottom: 0.5rem;
    }

    #model-select {
        flex-grow: 1; /* 남는 공간 채우기 */
    }

    .main-chart-wrapper {
        height: 350px; /* 모바일에서 차트 높이 살짝 줄임 */
    }
    .chart-container { height: 245px; }
    .rsi-chart-container { height: 105px; }


    .about-section {
        padding: 2rem 1rem 4rem;
    }

    .model-comparison {
        grid-template-columns: 1fr; /* [핵심] 1열 스택 구조로 변경 */
    }

    .about-content table {
        border: none;
    }

    .about-content thead {
        display: none; /* [핵심] 기존 테이블 헤더 숨김 */
    }

    .about-content tr {
        display: block;
        margin-bottom: 1rem;
        border: 1px solid var(--color-border);
        border-radius: 8px;
        background-color: var(--color-card-bg);
    }
    
    .about-content td {
        display: block;
        text-align: right; /* 값을 오른쪽 정렬 */
        border: none;
        border-bottom: 1px solid var(--color-border);
        padding-left: 50%; /* 라벨이 들어갈 공간 확보 */
        position: relative;
    }

    .about-content td:last-child {
        border-bottom: none;
    }

    .about-content td::before {
        content: attr(data-label); /* [핵심] data-label 속성값을 가져와 라벨로 사용 */
        position: absolute;
        left: 0.8rem;
        width: 45%;
        text-align: left;
        font-weight: 600;
        color: var(--color-text-primary);
    }
}