/* ==========================================================================
   도서 요약 시스템 메인 CSS (style.css)
   테마: Deep Space Dark Mode & Glassmorphism
   ========================================================================== */

:root {
    /* 색상 변수 */
    --bg-primary: #0a0a12;
    --bg-glass: rgba(18, 18, 30, 0.65);
    --bg-glass-hover: rgba(28, 28, 48, 0.8);
    --border-glass: rgba(255, 255, 255, 0.08);
    --border-glass-active: rgba(124, 77, 255, 0.3);
    
    --color-primary: #8247ff;
    --color-primary-rgb: 130, 71, 255;
    --color-secondary: #00f0ff;
    --color-secondary-rgb: 0, 240, 255;
    --color-success: #00e676;
    --color-error: #ff1744;
    
    --text-main: #f3f3fb;
    --text-muted: #9fa0b5;
    --text-dark: #12121e;
    
    /* 타이포그래피 */
    --font-sans: 'Inter', 'Noto Sans KR', -apple-system, sans-serif;
    --font-title: 'Outfit', 'Inter', sans-serif;
    
    /* 스크롤바 변수 */
    --scrollbar-thumb: rgba(130, 71, 255, 0.5);
    --scrollbar-track: rgba(10, 10, 18, 0.3);
    
    /* 전환 효과 */
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    background-color: var(--bg-primary);
    color: var(--text-main);
    font-family: var(--font-sans);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* 스크롤바 커스터마이징 (Modern API) */
body, .tab-panel, .markdown-body {
    scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
    scrollbar-width: thin;
}

/* Legacy WebKit 스크롤바 Fallback */
@supports not (scrollbar-color: auto) {
    ::-webkit-scrollbar {
        width: 8px;
        height: 8px;
    }
    ::-webkit-scrollbar-thumb {
        background: var(--scrollbar-thumb);
        border-radius: 4px;
    }
    ::-webkit-scrollbar-track {
        background: var(--scrollbar-track);
    }
}

/* 배경 그래픽 장식 */
.background-decorations {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.circle {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.15;
}

.circle-1 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--color-primary) 0%, transparent 70%);
    top: 10%;
    right: -5%;
}

.circle-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--color-secondary) 0%, transparent 70%);
    bottom: 20%;
    left: -10%;
}

/* 컨테이너 및 레이아웃 */
.app-container {
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* 헤더 영역 */
.app-header {
    text-align: center;
    margin-bottom: 40px;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.logo-icon {
    font-size: 32px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-text {
    font-family: var(--font-title);
    font-size: 28px;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.logo-highlight {
    background: linear-gradient(90deg, var(--color-primary) 30%, var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header-title {
    font-family: var(--font-title);
    font-size: 38px;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
    background: linear-gradient(180deg, #ffffff 0%, #d8d8eb 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header-subtitle {
    color: var(--text-muted);
    font-size: 16px;
    max-width: 600px;
    margin: 0 auto;
}

/* 글래스모피즘 카드 공통 */
.glass-card {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 24px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
    transition: var(--transition-smooth);
}

.glass-card:hover {
    border-color: rgba(130, 71, 255, 0.2);
}

/* 설정 카드 */
.section-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
}

.icon-margin {
    margin-right: 10px;
    color: var(--color-primary);
}

.settings-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

@media (max-width: 768px) {
    .settings-grid {
        grid-template-columns: 1fr;
    }
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.input-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-muted);
}

.password-wrapper {
    display: flex;
    position: relative;
}

.text-input, .select-input {
    width: 100%;
    background: rgba(10, 10, 18, 0.6);
    border: 1px solid var(--border-glass);
    border-radius: 8px;
    padding: 12px 16px;
    color: var(--text-main);
    font-size: 15px;
    font-family: inherit;
    transition: var(--transition-smooth);
}

.password-wrapper .text-input {
    padding-right: 45px;
}

.text-input:focus, .select-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--border-glass-active);
}

.toggle-btn {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
}

.toggle-btn:hover {
    color: var(--text-main);
}

.input-help {
    font-size: 12px;
    color: var(--text-muted);
}

.code-font {
    font-family: monospace;
}

/* 고급 설정 */
.advanced-settings {
    margin-top: 15px;
    border-top: 1px solid var(--border-glass);
    padding-top: 15px;
}

.advanced-toggle-btn {
    background: none;
    border: none;
    color: var(--color-secondary);
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 0;
}

.advanced-toggle-btn:hover {
    filter: brightness(1.2);
}

.toggle-icon {
    font-size: 12px;
    transition: var(--transition-smooth);
}

.advanced-toggle-btn.active .toggle-icon {
    transform: rotate(180deg);
}

.advanced-panel {
    margin-top: 15px;
    padding: 15px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 8px;
    border-left: 3px solid var(--color-secondary);
}

.hidden {
    display: none !important;
}

/* 파일 업로드 구역 */
.drop-zone {
    border: 2px dashed var(--border-glass);
    border-radius: 12px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    background: rgba(10, 10, 18, 0.3);
    transition: var(--transition-smooth);
    position: relative;
}

.drop-zone:hover, .drop-zone.dragover {
    border-color: var(--color-secondary);
    background: rgba(0, 240, 255, 0.03);
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.05);
}

.hidden-file-input {
    display: none;
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.upload-icon-wrapper {
    width: 64px;
    height: 64px;
    background: rgba(130, 71, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 8px;
    transition: var(--transition-smooth);
}

.drop-zone:hover .upload-icon-wrapper {
    background: rgba(0, 240, 255, 0.15);
    transform: scale(1.05);
}

.upload-icon {
    font-size: 28px;
    color: var(--color-primary);
    transition: var(--transition-smooth);
}

.drop-zone:hover .upload-icon {
    color: var(--color-secondary);
}

.upload-limit {
    font-size: 13px;
    color: var(--text-muted);
}

/* 선택된 파일 정보 */
.selected-file-info {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: rgba(0, 240, 255, 0.1);
    border: 1px solid rgba(0, 240, 255, 0.2);
    border-radius: 30px;
    padding: 6px 16px;
    margin-top: 10px;
    font-size: 14px;
}

.file-info-icon {
    color: var(--color-secondary);
}

.file-name {
    max-width: 250px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.remove-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 14px;
}

.remove-btn:hover {
    color: var(--color-error);
}

/* 버튼 스타일 */
.action-btn-wrapper {
    text-align: center;
    margin-top: 24px;
}

.primary-btn {
    background: linear-gradient(90deg, var(--color-primary), #632dff);
    color: white;
    border: none;
    border-radius: 30px;
    padding: 15px 36px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-smooth);
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.primary-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--color-primary-glow);
    filter: brightness(1.1);
}

.primary-btn:disabled {
    background: #252538;
    color: #55556b;
    cursor: not-allowed;
}

.pulse-glow {
    animation: buttonGlow 2s infinite alternate;
}

@keyframes buttonGlow {
    0% {
        box-shadow: 0 0 5px rgba(130, 71, 255, 0.2);
    }
    100% {
        box-shadow: 0 0 20px rgba(130, 71, 255, 0.5);
    }
}

/* 진행 상태 카드 */
.progress-details {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.status-label {
    color: var(--text-muted);
    font-size: 14px;
}

.status-value {
    font-weight: 500;
    color: var(--color-secondary);
}

.progress-percent {
    font-family: var(--font-title);
    font-size: 22px;
    font-weight: 600;
    color: var(--color-secondary);
}

.progress-bar-container {
    height: 8px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 15px;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: 4px;
    box-shadow: 0 0 10px var(--color-secondary-glow);
    transition: width 0.4s ease;
}

.progress-sub-text {
    font-size: 13px;
    color: var(--text-muted);
    text-align: center;
}

/* 결과 출력 카드 */
.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    border-bottom: 1px solid var(--border-glass);
    padding-bottom: 15px;
}

.result-header .section-title {
    margin-bottom: 0;
}

.text-success {
    color: var(--color-success);
}

.action-btn {
    border-radius: 8px;
    padding: 10px 18px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition-smooth);
}

.download-btn {
    background: linear-gradient(135deg, #00c6ff, #0072ff);
    color: white;
    border: none;
}

.download-btn:hover {
    box-shadow: 0 4px 15px rgba(0, 114, 255, 0.4);
    transform: translateY(-1px);
}

/* 탭 메뉴 */
.tab-menu {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border-glass);
    padding-bottom: 10px;
}

.tab-btn {
    background: none;
    border: none;
    padding: 10px 20px;
    color: var(--text-muted);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    position: relative;
    transition: var(--transition-smooth);
    display: flex;
    align-items: center;
    gap: 8px;
}

.tab-btn:hover {
    color: var(--text-main);
}

.tab-btn.active {
    color: var(--color-primary);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -11px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--color-primary);
    box-shadow: 0 0 8px var(--color-primary-glow);
}

.tab-panel {
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 아코디언 스타일 (HTML5 details) */
.chapter-card {
    background: rgba(10, 10, 18, 0.4);
    border: 1px solid var(--border-glass);
    border-radius: 12px;
    margin-bottom: 12px;
    overflow: hidden;
    transition: var(--transition-smooth);
}

.chapter-card[open] {
    border-color: var(--color-primary);
}

.chapter-card:hover {
    background: rgba(28, 28, 48, 0.3);
}

.chapter-header {
    padding: 16px 20px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    user-select: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    list-style: none; /* 기본 화살표 숨김 */
}

/* WebKit 브라우저용 화살표 제거 */
.chapter-header::-webkit-details-marker {
    display: none;
}

.chapter-header::after {
    content: '\f078';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 12px;
    color: var(--text-muted);
    transition: var(--transition-smooth);
}

.chapter-card[open] .chapter-header::after {
    transform: rotate(180deg);
    color: var(--color-primary);
}

.chapter-body {
    padding: 0 20px 20px 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.03);
    background: rgba(0, 0, 0, 0.15);
}

/* 마크다운 스타일링 */
.markdown-body {
    color: #e2e2ec;
    font-size: 15px;
    line-height: 1.7;
}

.markdown-body h1, .markdown-body h2, .markdown-body h3 {
    margin-top: 20px;
    margin-bottom: 12px;
    font-weight: 600;
    color: #ffffff;
    font-family: var(--font-title);
}

.markdown-body h3 {
    font-size: 17px;
    border-left: 3px solid var(--color-primary);
    padding-left: 8px;
}

.markdown-body p {
    margin-bottom: 14px;
}

.markdown-body ul, .markdown-body ol {
    margin-bottom: 14px;
    padding-left: 20px;
}

.markdown-body li {
    margin-bottom: 6px;
}

/* 종합 분석 레이아웃 */
.analysis-report-container {
    position: relative;
    background: rgba(10, 10, 18, 0.4);
    border: 1px solid var(--border-glass);
    border-radius: 12px;
    padding: 30px;
}

.copy-action-wrapper {
    position: absolute;
    top: 20px;
    right: 20px;
}

.small-action-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-glass);
    color: var(--text-muted);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 12px;
    cursor: pointer;
    transition: var(--transition-smooth);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.small-action-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-main);
}

/* 푸터 영역 */
.app-footer {
    text-align: center;
    margin-top: 50px;
    padding-top: 30px;
    border-top: 1px solid var(--border-glass);
    color: var(--text-muted);
    font-size: 13px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-help {
    max-width: 600px;
    margin: 0 auto;
    opacity: 0.8;
}

/* 스크린 리더용 숨김 */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}