/*
 * =============================================================================
 * 파일명: chat.css
 * 프로젝트: ChatBot.Web
 * 설명: 채팅 UI 스타일시트
 *       모던하고 깔끔한 채팅 인터페이스 디자인
 * 작성일: 2025년 12월
 * =============================================================================
 */

/* ============================================================================
   1. 기본 설정 및 변수
   ============================================================================ */

:root {
    /* 색상 팔레트 */
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --secondary-color: #6366f1;
    --background-color: #0f172a;
    --surface-color: #1e293b;
    --surface-light: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #334155;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    
    /* 메시지 색상 */
    --user-message-bg: #4f46e5;
    --assistant-message-bg: #1e293b;
    --error-message-bg: #7f1d1d;
    
    /* 그림자 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    
    /* 크기 */
    --header-height: 60px;
    --input-height: 80px;
    --max-width: 900px;
    --border-radius: 12px;
}

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

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

/* ============================================================================
   2. 채팅 컨테이너
   ============================================================================ */

.chat-container {
    max-width: var(--max-width);
    margin: 0 auto;
    height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--background-color);
    box-shadow: var(--shadow-lg);
    position: relative;  /* 드래그 앤 드롭 오버레이용 */
}

/* ============================================================================
   3. 헤더
   ============================================================================ */

.chat-header {
    height: var(--header-height);
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.header-left h1 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.header-right {
    display: flex;
    gap: 10px;
}

.select-box {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--surface-light);
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.select-box:hover {
    border-color: var(--primary-color);
}

.select-box:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

/* ============================================================================
   4. API Key 섹션
   ============================================================================ */

.api-key-section {
    padding: 10px 20px;
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.api-key-section label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    white-space: nowrap;
    min-width: 70px;
}

.api-key-wrapper {
    display: flex;
    align-items: center;
    gap: 6px;
    flex: 1;
    max-width: 400px;
}

.api-key-wrapper input {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--surface-light);
    color: var(--text-primary);
    font-size: 0.875rem;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

.api-key-wrapper input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.api-key-wrapper input::placeholder {
    font-family: inherit;
    color: var(--text-muted);
}

.btn-icon {
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--surface-light);
    color: var(--text-secondary);
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
}

.btn-icon:hover {
    background: var(--surface-color);
    border-color: var(--primary-color);
}

.api-key-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.api-key-hint.using-client {
    color: var(--success-color);
}

/* ============================================================================
   5. 시스템 프롬프트 섹션
   ============================================================================ */

.system-prompt-section {
    padding: 12px 20px;
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.system-prompt-section label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

.system-prompt-section textarea {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--surface-light);
    color: var(--text-primary);
    font-size: 0.875rem;
    resize: none;
    height: 36px;
    font-family: inherit;
}

.system-prompt-section textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* ============================================================================
   5. 채팅 메시지 영역
   ============================================================================ */

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* 스크롤바 스타일 */
.chat-messages::-webkit-scrollbar {
    width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
    background: var(--background-color);
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--surface-light);
    border-radius: 4px;
}

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

/* 웰컴 메시지 */
.welcome-message {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
}

.welcome-message p {
    margin: 8px 0;
}

/* ============================================================================
   6. 메시지 스타일
   ============================================================================ */

.message {
    display: flex;
    gap: 12px;
    max-width: 85%;
    animation: fadeIn 0.3s ease;
}

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

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

.message-assistant {
    align-self: flex-start;
}

.message-error {
    align-self: center;
    max-width: 90%;
}

.message-icon {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    background: var(--surface-light);
    flex-shrink: 0;
}

.message-content {
    padding: 12px 16px;
    border-radius: var(--border-radius);
    line-height: 1.6;
    word-wrap: break-word;
}

.message-user .message-content {
    background: var(--user-message-bg);
    color: white;
    border-bottom-right-radius: 4px;
}

.message-assistant .message-content {
    background: var(--assistant-message-bg);
    border: 1px solid var(--border-color);
    border-bottom-left-radius: 4px;
}

.message-error .message-content {
    background: var(--error-message-bg);
    color: #fca5a5;
    text-align: center;
}

/* 코드 블록 */
.message-content pre {
    background: #0d1117;
    padding: 12px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 8px 0;
}

.message-content code {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.875rem;
}

.message-content p code {
    background: rgba(0, 0, 0, 0.3);
    padding: 2px 6px;
    border-radius: 4px;
}

.error-text {
    color: #fca5a5;
}

/* ============================================================================
   7. 입력 영역
   ============================================================================ */

.chat-input-section {
    padding: 16px 20px;
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
}

.input-wrapper {
    display: flex;
    gap: 12px;
    align-items: flex-end;
}

.input-wrapper textarea {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--surface-light);
    color: var(--text-primary);
    font-size: 1rem;
    resize: none;
    min-height: 48px;
    max-height: 150px;
    font-family: inherit;
    line-height: 1.5;
}

.input-wrapper textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

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

.input-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 10px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--primary-color);
}

/* ============================================================================
   8. 버튼 스타일
   ============================================================================ */

.btn-primary {
    width: 48px;
    height: 48px;
    border: none;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    font-size: 1.25rem;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-primary:active {
    transform: scale(0.95);
}

.btn-primary:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
}

.btn-secondary {
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--surface-light);
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-secondary:hover {
    background: var(--surface-color);
    border-color: var(--primary-color);
}

.btn-text {
    padding: 8px 12px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: color 0.2s;
}

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

/* ============================================================================
   9. 로딩 오버레이
   ============================================================================ */

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--surface-light);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* ============================================================================
   10. 파일 첨부
   ============================================================================ */

.file-preview {
    padding: 10px 20px;
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
}

.file-preview-content {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: var(--surface-light);
    border-radius: 8px;
    border: 1px dashed var(--primary-color);
}

.file-icon {
    font-size: 1.5rem;
}

.file-name {
    flex: 1;
    font-size: 0.875rem;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-size {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.file-remove {
    width: 24px;
    height: 24px;
    border: none;
    background: rgba(239, 68, 68, 0.2);
    color: var(--error-color);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    transition: background-color 0.2s;
}

.file-remove:hover {
    background: rgba(239, 68, 68, 0.4);
}

.btn-attach {
    width: 44px;
    height: 44px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background: var(--surface-light);
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
}

.btn-attach:hover {
    background: var(--surface-color);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-attach.has-file {
    background: rgba(79, 70, 229, 0.2);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.file-support-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-left: auto;
    margin-right: 10px;
}

.file-support-hint.supported {
    color: var(--success-color);
}

.file-support-hint.not-supported {
    color: var(--warning-color);
}

/* 드래그 앤 드롭 */
.chat-container.drag-over {
    outline: 3px dashed var(--primary-color);
    outline-offset: -3px;
}

.chat-container.drag-over::after {
    content: "📎 파일을 여기에 놓으세요";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(79, 70, 229, 0.9);
    color: white;
    padding: 20px 40px;
    border-radius: 12px;
    font-size: 1.25rem;
    z-index: 100;
}

/* ============================================================================
   11. 타이핑 인디케이터
   ============================================================================ */

.typing-indicator {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 12px 16px;
    background: var(--surface-light);
    border-radius: 16px;
    width: fit-content;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--primary-color);
    border-radius: 50%;
    animation: typing-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;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0s;
}

@keyframes typing-bounce {
    0%, 80%, 100% {
        transform: scale(0.6);
        opacity: 0.4;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

/* 타이핑 텍스트 애니메이션 */
.typing-text {
    display: inline-flex;
    align-items: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.typing-text::after {
    content: '';
    display: inline-block;
    width: 4px;
    height: 16px;
    background: var(--primary-color);
    margin-left: 4px;
    animation: cursor-blink 1s infinite;
}

@keyframes cursor-blink {
    0%, 50% {
        opacity: 1;
    }
    51%, 100% {
        opacity: 0;
    }
}

/* 메시지 로딩 상태 */
.message.loading .message-content {
    min-height: 40px;
}

/* ============================================================================
   12. 토스트 메시지
   ============================================================================ */

.toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    padding: 12px 24px;
    background: var(--surface-color);
    color: var(--text-primary);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transition: opacity 0.3s, transform 0.3s;
    z-index: 1001;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ============================================================================
   11. 반응형 디자인
   ============================================================================ */

@media (max-width: 768px) {
    .chat-container {
        max-width: 100%;
    }
    
    .chat-header {
        padding: 0 16px;
    }
    
    .header-left h1 {
        font-size: 1rem;
    }
    
    .select-box {
        padding: 6px 10px;
        font-size: 0.8rem;
    }
    
    .api-key-section {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
        padding: 10px 16px;
    }
    
    .api-key-section label {
        display: none;
    }
    
    .api-key-wrapper {
        max-width: 100%;
    }
    
    .system-prompt-section {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }
    
    .system-prompt-section label {
        display: none;
    }
    
    .chat-messages {
        padding: 16px;
    }
    
    .message {
        max-width: 95%;
    }
    
    .message-icon {
        width: 32px;
        height: 32px;
        font-size: 1rem;
    }
    
    .advanced-settings-section {
        padding: 8px;
    }
    
    .settings-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================================================
   11. 고급 설정 섹션
   ============================================================================ */

.advanced-settings-section {
    padding: 0 16px;
    margin-bottom: 8px;
}

.btn-toggle-advanced {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 16px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-toggle-advanced:hover {
    background: var(--surface-light);
    color: var(--text-primary);
}

.toggle-icon {
    transition: transform 0.3s ease;
}

.toggle-icon.expanded {
    transform: rotate(180deg);
}

.advanced-settings {
    margin-top: 12px;
    padding: 16px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    animation: slideDown 0.3s ease;
}

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

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.setting-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.setting-item label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.setting-item small {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.slider-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
}

.slider-wrapper input[type="range"] {
    flex: 1;
    height: 6px;
    background: var(--surface-light);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
    -webkit-appearance: none;
}

.slider-wrapper input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.2s ease, background 0.2s ease;
}

.slider-wrapper input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    background: var(--primary-hover);
}

.slider-wrapper input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--primary-color);
    border: none;
    border-radius: 50%;
    cursor: pointer;
}

.slider-value {
    min-width: 45px;
    padding: 4px 8px;
    background: var(--surface-light);
    border-radius: 4px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--primary-color);
    text-align: center;
}

.input-with-unit {
    display: flex;
    align-items: center;
    gap: 8px;
}

.input-with-unit input[type="number"] {
    flex: 1;
    padding: 8px 12px;
    background: var(--surface-light);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.875rem;
    outline: none;
}

.input-with-unit input[type="number"]:focus {
    border-color: var(--primary-color);
}

.input-with-unit span {
    font-size: 0.75rem;
    color: var(--text-muted);
}

#resetAdvanced {
    margin-top: 16px;
    padding: 8px 16px;
    font-size: 0.875rem;
}