/* ============================================
   천상열차분야지도 학습 챗봇 스타일
   ============================================ */

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

:root {
    --primary-color: #1a237e;
    --primary-light: #3949ab;
    --accent-color: #ffd700;
    --bg-dark: #0a0a1a;
    --bg-card: #12122a;
    --text-primary: #ffffff;
    --text-secondary: #b0b0c0;
    --border-color: #2a2a4a;
    --bot-message-bg: linear-gradient(135deg, #1a1a3a 0%, #252550 100%);
    --user-message-bg: linear-gradient(135deg, #3949ab 0%, #1a237e 100%);
}

body {
    font-family: 'Noto Sans KR', sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    overflow: hidden;
}

/* 별 배경 효과 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        radial-gradient(2px 2px at 20px 30px, #ffffff, transparent),
        radial-gradient(2px 2px at 40px 70px, rgba(255,255,255,0.8), transparent),
        radial-gradient(1px 1px at 90px 40px, #ffffff, transparent),
        radial-gradient(2px 2px at 130px 80px, rgba(255,255,255,0.6), transparent),
        radial-gradient(1px 1px at 160px 120px, #ffffff, transparent);
    background-repeat: repeat;
    background-size: 200px 200px;
    opacity: 0.3;
    pointer-events: none;
    z-index: 0;
}

/* 채팅 컨테이너 */
.chat-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

/* 헤더 */
.chat-header {
    background: linear-gradient(180deg, var(--bg-card) 0%, transparent 100%);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
    position: sticky;
    top: 0;
    z-index: 10;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.star-icon {
    font-size: 1.8rem;
    animation: twinkle 2s ease-in-out infinite;
}

@keyframes twinkle {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.1); }
}

.logo h1 {
    font-size: 1.2rem;
    font-weight: 500;
    background: linear-gradient(90deg, var(--accent-color), #fff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-links {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.edu-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.edu-link:hover {
    color: var(--accent-color);
    border-color: var(--accent-color);
}

/* 언어 선택 드롭다운 */
.language-selector {
    position: relative;
}

.lang-btn {
    background: rgba(255, 215, 0, 0.1);
    color: var(--accent-color);
    border: 1px solid rgba(255, 215, 0, 0.2);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.lang-btn:hover {
    background: rgba(255, 215, 0, 0.2);
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.dropdown-arrow {
    width: 16px;
    height: 16px;
    transition: transform 0.3s ease;
}

.language-selector.open .dropdown-arrow {
    transform: rotate(180deg);
}

.language-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0.5rem;
    min-width: 150px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 100;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.language-selector.open .language-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.75rem 1rem;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s ease;
    text-align: left;
}

.lang-option:hover {
    background: rgba(255, 215, 0, 0.1);
}

.lang-option.active {
    background: rgba(255, 215, 0, 0.2);
    color: var(--accent-color);
}

.lang-flag {
    font-size: 1.2rem;
}

/* 메인 채팅 영역 */
.chat-main {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
    scroll-behavior: smooth;
}

.chat-messages {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* 메시지 스타일 */
.message {
    display: flex;
    gap: 1rem;
    max-width: 85%;
    animation: fadeIn 0.3s ease;
}

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

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

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

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.bot-message .message-avatar {
    background: var(--bg-card);
    border: 2px solid var(--accent-color);
}

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

.message-content {
    padding: 1rem 1.25rem;
    border-radius: 18px;
    line-height: 1.6;
}

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

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

.message-content p {
    margin-bottom: 0.5rem;
}

.message-content p:last-child {
    margin-bottom: 0;
}

.message-content strong {
    color: var(--accent-color);
}

/* 빠른 액션 버튼 */
.quick-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.quick-btn {
    background: rgba(255, 215, 0, 0.1);
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.3s ease;
}

.quick-btn:hover {
    background: var(--accent-color);
    color: var(--bg-dark);
}

/* 로딩 애니메이션 */
.typing-indicator {
    display: flex;
    gap: 0.3rem;
    padding: 1rem;
}

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

.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: 0; }

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

/* 입력 영역 */
.chat-input-area {
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
}

.input-container {
    display: flex;
    gap: 0.75rem;
    align-items: flex-end;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 25px;
    padding: 0.5rem 0.5rem 0.5rem 1.25rem;
    transition: border-color 0.3s ease;
}

.input-container:focus-within {
    border-color: var(--accent-color);
}

#user-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    resize: none;
    max-height: 120px;
    line-height: 1.5;
    padding: 0.5rem 0;
}

#user-input::placeholder {
    color: var(--text-secondary);
}

#user-input:focus {
    outline: none;
}

.send-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--primary-light);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.send-btn:hover {
    background: var(--accent-color);
}

.send-btn:hover svg {
    stroke: var(--bg-dark);
}

.send-btn svg {
    width: 20px;
    height: 20px;
    stroke: white;
}

.disclaimer {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.75rem;
    opacity: 0.7;
}

/* 링크 스타일 */
.message-content a {
    color: var(--accent-color);
    text-decoration: underline;
}

/* 코드/인용 스타일 */
.message-content code {
    background: rgba(255, 215, 0, 0.1);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
}

.message-content blockquote {
    border-left: 3px solid var(--accent-color);
    padding-left: 1rem;
    margin: 0.5rem 0;
    color: var(--text-secondary);
    font-style: italic;
}

/* 리스트 스타일 */
.message-content ul, .message-content ol {
    margin: 0.5rem 0;
    padding-left: 1.5rem;
}

.message-content li {
    margin-bottom: 0.3rem;
}

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

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

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

.chat-main::-webkit-scrollbar-thumb:hover {
    background: var(--primary-light);
}

/* 반응형 */
@media (max-width: 768px) {
    .chat-header {
        padding: 0.75rem 1rem;
    }

    .logo h1 {
        font-size: 1rem;
    }

    .edu-link {
        display: none;
    }

    .message {
        max-width: 95%;
    }

    .chat-main {
        padding: 1rem;
    }

    .chat-input-area {
        padding: 0.75rem 1rem;
    }
}

/* 퀴즈 스타일 */
.quiz-container {
    background: rgba(255, 215, 0, 0.05);
    border: 1px solid var(--accent-color);
    border-radius: 12px;
    padding: 1rem;
    margin-top: 0.5rem;
}

.quiz-question {
    font-weight: 500;
    margin-bottom: 0.75rem;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.quiz-option {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
    color: #ffffff;
    font-size: 1rem;
}

.quiz-option:hover {
    border-color: var(--accent-color);
    background: rgba(255, 215, 0, 0.1);
}

.quiz-option.correct {
    border-color: #4caf50;
    background: rgba(76, 175, 80, 0.2);
}

.quiz-option.incorrect {
    border-color: #f44336;
    background: rgba(244, 67, 54, 0.2);
}

/* 에러 메시지 */
.error-message {
    color: #f44336;
    background: rgba(244, 67, 54, 0.1);
    border: 1px solid rgba(244, 67, 54, 0.3);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    margin-top: 0.5rem;
}

/* 새 답변 버튼 */
.new-message-btn {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-color);
    color: var(--bg-dark);
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: 25px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    box-shadow: 0 4px 15px rgba(255, 215, 0, 0.4);
    z-index: 100;
    animation: bounceIn 0.3s ease;
    transition: all 0.3s ease;
}

.new-message-btn:hover {
    background: #fff;
    box-shadow: 0 6px 20px rgba(255, 255, 255, 0.5);
    transform: translateX(-50%) scale(1.05);
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
    100% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}