/* 기본 리셋 및 폰트 설정 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #0066CC;
    --primary-light: #E8F4FD;
    --primary-dark: #004C99;
    --bg-color: #F5F7FA;
    --white: #FFFFFF;
    --text-primary: #1A1A1A;
    --text-secondary: #666666;
    --border-color: #E0E0E0;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    
    /* 글자 크기 변수 */
    --font-size-base: 16px;
}

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: var(--font-size-base);
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

body.font-small {
    --font-size-base: 14px;
}

body.font-large {
    --font-size-base: 18px;
}

/* 헤더 */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: 12px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--white);
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
}

.beta-badge {
    background-color: #FF6B35;
    color: var(--white);
    font-size: 0.7rem;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 4px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.font-size-control {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
}

.font-size-control select {
    padding: 6px 12px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 6px;
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--white);
    cursor: pointer;
    font-size: 0.875rem;
}

.font-size-control select option {
    color: var(--text-primary);
    background-color: var(--white);
}

.new-chat-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background-color: var(--white);
    color: var(--primary-color);
    border: none;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.new-chat-btn:hover {
    background-color: var(--primary-light);
    transform: translateY(-1px);
}

/* 헤더 참조 버튼 (모바일용) */
.header-reference-btn {
    display: none;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    background-color: rgba(255, 255, 255, 0.15);
    color: var(--white);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.header-reference-btn:hover {
    background-color: rgba(255, 255, 255, 0.25);
}

.header-reference-badge {
    background-color: #FF6B35;
    color: var(--white);
    font-size: 0.7rem;
    font-weight: 700;
    min-width: 18px;
    height: 18px;
    border-radius: 9px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 5px;
}

.header-reference-badge.hidden {
    display: none;
}

/* 메인 컨텐츠 */
.main-content {
    flex: 1;
    display: flex;
    justify-content: center;
    padding: 24px;
}

.chat-container {
    width: 100%;
    max-width: 800px;
    display: flex;
    flex-direction: column;
    background-color: var(--white);
    border-radius: 16px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

/* 채팅 메시지 영역 */
.chat-messages {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
    min-height: 400px;
    max-height: calc(100vh - 280px);
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.message {
    display: flex;
    gap: 12px;
    animation: fadeIn 0.3s ease;
}

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

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.bot-message .message-avatar {
    background-color: var(--primary-light);
}

.user-message .message-avatar {
    background-color: #E8E8E8;
}

.message-content {
    flex: 1;
    max-width: calc(100% - 52px);
}

.message-sender {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.message-text {
    font-size: var(--font-size-base);
    line-height: 1.7;
    color: var(--text-primary);
    word-break: keep-all;
}

.bot-message .message-text {
    background-color: var(--bg-color);
    padding: 16px;
    border-radius: 0 16px 16px 16px;
}

.user-message {
    flex-direction: row-reverse;
}

.user-message .message-content {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.user-message .message-text {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 16px;
    border-radius: 16px 0 16px 16px;
}

/* 로딩 표시 */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 16px;
    background-color: var(--bg-color);
    border-radius: 0 16px 16px 16px;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--primary-color);
    animation: bounce 1.4s infinite ease-in-out both;
}

.typing-indicator span:nth-child(1) { animation-delay: -0.32s; }
.typing-indicator span:nth-child(2) { animation-delay: -0.16s; }

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1); }
}

/* 입력 영역 */
.chat-input-container {
    padding: 16px 24px 24px;
    border-top: 1px solid var(--border-color);
    background-color: var(--white);
}

.chat-input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    background-color: var(--bg-color);
    border-radius: 12px;
    padding: 12px 16px;
    border: 2px solid transparent;
    transition: border-color 0.2s ease;
}

.chat-input-wrapper:focus-within {
    border-color: var(--primary-color);
}

.chat-input-wrapper textarea {
    flex: 1;
    border: none;
    background: transparent;
    font-size: var(--font-size-base);
    font-family: inherit;
    resize: none;
    outline: none;
    line-height: 1.5;
    max-height: 120px;
    color: var(--text-primary);
}

.chat-input-wrapper textarea::placeholder {
    color: var(--text-secondary);
}

.send-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.send-btn:hover {
    background-color: var(--primary-dark);
    transform: scale(1.05);
}

.send-btn:disabled {
    background-color: var(--border-color);
    cursor: not-allowed;
    transform: none;
}

.input-notice {
    margin-top: 12px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-align: center;
}

/* 스크롤바 스타일 */
.chat-messages::-webkit-scrollbar {
    width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
    background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 3px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background-color: var(--text-secondary);
}

/* 앱 레이아웃 - 분할 뷰 */
.app-layout {
    display: flex;
    width: 100%;
    max-width: 1400px;
    gap: 24px;
    height: calc(100vh - 120px);
}

.app-layout .chat-container {
    flex: 1;
    min-width: 0;
    max-width: 800px;
    height: 100%;
}

.app-layout .chat-messages {
    max-height: calc(100% - 120px);
}

/* 참조 패널 */
.reference-panel {
    width: 380px;
    background: var(--white);
    border-radius: 16px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: all 0.3s ease;
}

.reference-panel.hidden {
    display: none;
}

.panel-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-light) 0%, #fff 100%);
}

.panel-header h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary-dark);
    display: flex;
    align-items: center;
    gap: 8px;
}

.panel-header h3::before {
    content: '';
    width: 4px;
    height: 18px;
    background: var(--primary-color);
    border-radius: 2px;
}

.panel-close-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.panel-close-btn:hover {
    background: var(--bg-color);
    color: var(--text-primary);
}

.panel-content {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
}

.panel-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    min-height: 200px;
    text-align: center;
    color: var(--text-secondary);
    gap: 16px;
}

.panel-empty-state p {
    font-size: 0.875rem;
    line-height: 1.6;
}

/* 아코디언 */
.reference-accordion {
    margin-bottom: 12px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.2s;
}

.reference-accordion:hover {
    border-color: var(--primary-color);
}

.reference-accordion.highlight {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.accordion-header {
    padding: 14px 16px;
    background: var(--bg-color);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    transition: background 0.2s;
}

.accordion-header:hover {
    background: var(--primary-light);
}

.accordion-header.active {
    background: var(--primary-light);
}

.accordion-title {
    font-size: 0.875rem;
    line-height: 1.4;
    flex: 1;
}

.accordion-title strong {
    color: var(--primary-color);
    font-weight: 700;
    margin-right: 8px;
}

.accordion-icon {
    flex-shrink: 0;
    transition: transform 0.2s;
    color: var(--text-secondary);
}

.accordion-header.active .accordion-icon {
    transform: rotate(180deg);
}

.accordion-content {
    display: none;
    padding: 16px;
    font-size: 0.9rem;
    line-height: 1.8;
    color: var(--text-primary);
    background: var(--white);
    border-top: 1px solid var(--border-color);
}

.accordion-content.open {
    display: block;
}

.accordion-hierarchy {
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 1px dashed var(--border-color);
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.accordion-hierarchy span {
    display: inline-block;
    margin-right: 4px;
}

.accordion-hierarchy span::after {
    content: ' >';
    margin-left: 4px;
}

.accordion-hierarchy span:last-child::after {
    content: '';
}

.accordion-children {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px dashed var(--border-color);
}

.accordion-children-title {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-weight: 600;
}

.child-item {
    font-size: 0.8rem;
    padding: 6px 0;
    color: var(--text-secondary);
}

.child-item strong {
    color: var(--primary-color);
}

/* 참조 링크 (채팅 메시지 내) */
.reference-link {
    color: var(--primary-color);
    text-decoration: underline;
    text-decoration-style: dotted;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
}

.reference-link:hover {
    color: var(--primary-dark);
    text-decoration-style: solid;
}

/* 기존 플로팅 버튼 - 더 이상 사용 안 함 (헤더로 이동) */

/* 반응형 - 데스크탑 */
@media (min-width: 1025px) {
    .reference-panel {
        display: flex;
    }

    .header-reference-btn {
        display: none !important;
    }
}

/* 반응형 - 태블릿/모바일 */
@media (max-width: 1024px) {
    .app-layout {
        max-width: 800px;
    }

    .reference-panel {
        display: none;
        position: fixed;
        right: 0;
        top: 0;
        bottom: 0;
        width: 100%;
        max-width: 400px;
        z-index: 1000;
        border-radius: 0;
        box-shadow: -4px 0 20px rgba(0, 0, 0, 0.15);
    }

    .reference-panel.mobile-visible {
        display: flex;
    }

    .header-reference-btn {
        display: flex;
    }

    /* 패널 열렸을 때 배경 오버레이 */
    .panel-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
    }
}

@media (max-width: 768px) {
    .header {
        padding: 12px 16px;
        flex-wrap: wrap;
        gap: 12px;
    }

    .header-right {
        width: 100%;
        justify-content: space-between;
    }

    .main-content {
        padding: 16px;
    }

    .app-layout {
        height: calc(100vh - 140px);
    }

    .chat-container {
        border-radius: 12px;
    }

    .chat-messages {
        padding: 16px;
        min-height: 300px;
    }

    .chat-input-container {
        padding: 12px 16px 16px;
    }

    .reference-panel.mobile-visible {
        max-width: 100%;
    }
}

/* 패널 스크롤바 */
.panel-content::-webkit-scrollbar {
    width: 6px;
}

.panel-content::-webkit-scrollbar-track {
    background: transparent;
}

.panel-content::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 3px;
}

.panel-content::-webkit-scrollbar-thumb:hover {
    background-color: var(--text-secondary);
}