/* -------------------- */
/* --- 변수 및 기본 설정 --- */
/* -------------------- */
:root {
    --primary-bg: #f8fbfd;
    --intro-box-bg: #ffffff;
    --chatbox-bg: #e8f4f9;
    --chat-input-bg: #ffffff;
    --button-primary-bg: #a5d8f0;
    --button-primary-hover-bg: #8ecbe7;
    --button-secondary-bg: #f8af8d;
    --button-secondary-hover-bg: #ffc2c2;
    --text-dark: #405d6b;
    --text-light: #ffffff;
    --text-assistant: #5ab0d3;
    --text-notice: #7a8e98;
    --shadow-color-light: rgba(0, 0, 0, 0.05);
    --shadow-color-medium: rgba(0, 0, 0, 0.1);
    --user-bubble-bg: #dff1f8;
    --assistant-bubble-bg: #edf6f9;
    --text-user-bubble: #405d6b;
    --footer-bg: #e8f4f9;
    --text-footer: #7a8e98;
    --border-color: #c9e2ed;
    --input-focus-border: #a5d8f0;
    --input-focus-shadow: rgba(165, 216, 240, 0.25);
    --placeholder-color: #95aab3;
}


/* --- Sticky Footer 구현 --- */
html {
    height: 100%;
}

body {
    min-height: 100%;
    margin: 0;
    display: flex;
    flex-direction: column;
    font-family: 'Noto Sans KR', sans-serif;
    font-size: 15px;
    background-color: var(--primary-bg);
    color: var(--text-dark);
}

main {
    flex-grow: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* -------------------- */
/* --- 레이아웃 --- */
/* -------------------- */
.intro-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    box-sizing: border-box;
    width: 100%;
}

.intro-box {
    background-color: var(--intro-box-bg);
    padding: 1rem;
    border-radius: 18px;
    box-shadow: 0 10px 30px var(--shadow-color-medium);
    text-align: center;
    max-width: 480px;
    width: 100%;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;

}

.chat-container {
    display: none;
    /* JS에서 flex로 변경 */
    max-width: 600px;
    margin: 40px auto;
    padding: 25px;
    background-color: var(--intro-box-bg);
    border-radius: 12px;
    box-shadow: 0 6px 20px var(--shadow-color-light);
    /* 그림자 조정 */
    box-sizing: border-box;
    flex-direction: column;
    min-height: calc(100vh - 80px);
}

.chat-wrapper {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.chat-header {
    margin-bottom: 15px;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* --- 채팅 UI 핵심 스타일 --- */
.chat-box {
    flex-grow: 1;
    background-color: var(--chatbox-bg);
    padding: 15px;
    border-radius: 10px;
    overflow-y: auto;
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* 스크롤바 디자인 (Webkit 브라우저) */
.chat-box::-webkit-scrollbar {
    width: 8px;
}

.chat-box::-webkit-scrollbar-track {
    background: var(--chatbox-bg);
    /* 스크롤바 트랙 배경 */
    border-radius: 10px;
}

.chat-box::-webkit-scrollbar-thumb {
    background: #c7d2d8;
    border-radius: 10px;
}

.chat-box::-webkit-scrollbar-thumb:hover {
    background: #a8b6bd;
}

.chat-input {
    display: flex;
    align-items: center;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

/* -------------------- */
/* --- 컴포넌트 & 요소 --- */
/* -------------------- */
#intro h1 {
    font-size: 2.2em;
    color: var(--text-dark);
    margin-bottom: 8px;
    font-weight: 700;
}

#intro h1:last-of-type {
    font-size: 1.3em;
    font-weight: 500;
    color: var(--text-dark);
    margin-top: 0;
    margin-bottom: 30px;
    line-height: 1.4;
}

.intro-box img {
    width: 70%;
    max-width: 260px;
    height: auto;
    margin-bottom: 40px;
    border-radius: 12px;
    box-shadow: 0 6px 15px var(--shadow-color-light);
}

.quote-box {
    background-color: #f8f8f8;
    padding: 25px 30px;
    border-radius: 15px;
    margin: 25px 0;
    width: calc(100% - 20px);
    max-width: 380px;
    box-shadow: 0 4px 10px var(--shadow-color-light);
    border: 1px solid var(--border-color);

    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.quote {
    color: var(--text-dark);
    margin-bottom: 25px;
    font-size: 1em;
    line-height: 1.6;
    max-width: 100%;
}

.quote p {
    margin: 5px 0;
    font-style: italic;
    color: #555;
}

/* Input Group 스타일 */
.input-group {
    margin-bottom: 20px;
    width: 100%;
    /* 부모(quote-box)에 맞춰 너비 꽉 채우기 */
    max-width: 300px;
    /* input-group 자체의 최대 너비를 설정하여 너무 넓어지지 않게 함 */
    /* text-align: left; 제거: 이제 input-group 전체가 중앙 정렬되므로 텍스트 정렬은 개별 요소에서 처리 */
}

.input-group label {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
    color: var(--text-dark);
    font-weight: 600;
    font-size: 0.95em;
    padding-left: 5px;
    /* 아이콘과 텍스트가 살짝 안으로 들어가 보이게 */
}

.input-group label i {
    display: flex;
    align-items: center;
    justify-content: center;
    /* 레이블 아이콘과 텍스트를 중앙 정렬 */
    margin-bottom: 10px;
    color: var(--text-dark);
    font-weight: 600;
    font-size: 0.95em;
}

/* 세련된 입력 필드 스타일 */
input[type="date"].stylish-input,
input[type="text"].stylish-input {
    /* type="text"에도 적용되도록 명시 */
    width: 100%;
    padding: 15px 20px;
    /* 충분한 패딩으로 시원한 느낌 */
    border: 1px solid var(--border-color);
    border-radius: 10px;
    /* 적당히 둥근 모서리 */
    box-sizing: border-box;
    font-size: 1.05em;
    color: var(--text-dark);
    background-color: var(--chat-input-bg);
    transition: all 0.3s ease;
    box-shadow: inset 0 1px 4px rgba(0, 0, 0, 0.03);
    text-align: center;
}

/* 입력 필드 포커스 시 효과 */
input[type="date"].stylish-input:focus,
input[type="text"].stylish-input:focus {
    border-color: var(--input-focus-border);
    box-shadow: 0 0 0 4px var(--input-focus-shadow);
    outline: none;
    background-color: #fcfdff;
}

/* 플레이스홀더 텍스트 스타일 */
input::placeholder {
    color: var(--placeholder-color);
    font-style: italic;
    opacity: 1;
    font-size: 0.95em;
    letter-spacing: 0.5px;
}

.privacy-notice {
    text-align: center;
    margin-top: 30px;
    font-size: 0.88em;
    color: var(--text-notice);
    line-height: 1.5;
}

.privacy-notice .white-text {
    color: var(--text-notice);
    font-weight: 500;
}

/* 채팅 입력창 */
.chat-input input {
    flex: 1;
    background-color: var(--chat-input-bg);
    margin-right: 12px;
    border: 1px solid var(--border-color);
    border-radius: 28px;
    padding: 14px 20px;
    font-size: 1em;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05);
}

.chat-input input:focus {
    border-color: var(--button-primary-bg);
    box-shadow: 0 0 0 3px rgba(92, 184, 92, 0.2);
    outline: none;
}

button {
    color: var(--text-light);
    border: none;
    border-radius: 10px;
    padding: 14px 28px;
    cursor: pointer;
    margin-top: 0;
    transition: all 0.3s ease;
    font-weight: 600;
    letter-spacing: 0.5px;
}

button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 18px var(--shadow-color-light);
}

.start-button {
    background-color: var(--button-secondary-bg);
    font-size: 1.4em;
    padding: 20px 35px;
    width: 100%;
    border-radius: 12px;
    font-weight: 700;
}

.start-button:hover {
    background-color: var(--button-secondary-hover-bg);
    box-shadow: 0 8px 20px rgba(240, 173, 78, 0.3);
    /* 시작 버튼 고유 그림자 효과 */
}


.send-button {
    background-color: var(--button-primary-bg);
    padding: 14px 25px;
    font-size: 1.05em;
    border-radius: 28px;
    min-width: 90px;
}

.send-button:hover {
    background-color: var(--button-primary-hover-bg);
}

.home-button {
    background-color: #f5f5f5;
    color: var(--text-dark);
    border: 1px solid var(--border-color);
    padding: 10px 18px;
    font-size: 0.9em;
    border-radius: 25px;
    box-shadow: 0 2px 5px var(--shadow-color-light);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    white-space: nowrap;
    /* 텍스트 줄바꿈 방지 */
}

.home-button:hover {
    background-color: #e8e8e8;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color-light);
}

.intro-absolute-home-button {
    position: absolute;
    /* 글로벌 기본값 (모바일 포함 모든 화면에 적용) */
    top: 20px;
    right: 20px;
    z-index: 10;
}

/* --- 말풍선 UI 핵심 스타일 --- */
.chat-message {
    padding: 14px 20px;
    border-radius: 22px;
    max-width: 78%;
    animation: fadeIn 0.5s ease-in-out;
    word-break: break-word;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
}

.chat-message p {
    margin: 0;
    padding: 0;
}

.assistant-message {
    align-self: flex-start;
    background-color: #fdfaf3;
    border-bottom-left-radius: 8px;
    color: var(--text-dark);
}

.user-message {
    align-self: flex-end;
    background-color: #d0ebff;
    border-bottom-right-radius: 8px;
    color: var(--text-user-bubble);
}

/* --- 푸터 스타일 --- */
footer {
    border-top: 1px solid var(--border-color);
    background-color: var(--footer-bg);
    color: var(--text-footer);
    padding: 12px 20px;
    text-align: center;
    font-size: 0.9em;
}

/* -------------------- */
/* --- 반응형 디자인 (미디어 쿼리) --- */
/* -------------------- */
@media screen and (max-width: 768px) {
    body {
        font-size: 14px;
    }

    .intro-box,
    .chat-container {
        margin: 15px;
        padding: 20px;
        border-radius: 12px;
    }

    .intro-container {
        padding: 10px;
    }

    .intro-box img {
        width: 80%;
        max-width: 220px;
        margin-bottom: 30px;
    }

    .quote-box {
        padding: 20px 25px;
        max-width: 100%;
    }

    .chat-container {
        max-width: 95%;
        min-height: calc(100vh - 30px);
    }

    .chat-box {
        height: calc(100vh - 260px);
        padding: 12px;
        gap: 10px;
    }

    .chat-message {
        max-width: 85%;
        padding: 12px 18px;
    }

    .chat-input input {
        padding: 12px 18px;
        font-size: 0.95em;
    }

    .send-button {
        padding: 12px 20px;
        font-size: 0.95em;
    }

    .start-button {
        font-size: 1.2em;
        padding: 18px;
    }
}

@media screen and (max-width: 480px) {
    body {
        font-size: 13px;
    }

    .intro-box {
        padding: 20px;
    }

    #intro h1 {
        font-size: 1.8em;
    }

    #intro h1:last-of-type {
        font-size: 1.1em;
        margin-bottom: 25px;
    }

    .intro-box img {
        margin-bottom: 25px;
    }

    .quote-box {
        padding: 18px 20px;
        margin: 20px 0;
    }

    .input-group {
        margin-bottom: 18px;
    }

    .input-group label {
        font-size: 0.9em;
        margin-bottom: 8px;
    }

    input[type="date"].stylish-input,
    input[type="text"].stylish-input {
        padding: 13px 18px;
        font-size: 1em;
    }

    .privacy-notice {
        font-size: 0.82em;
        margin-top: 25px;
    }

    .chat-container {
        margin: 10px;
        padding: 15px;
    }

    .chat-box {
        height: calc(100vh - 210px);
    }
}

/* CSS 애니메이션 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- Custom Message Box Styles --- */

#customMessageBox {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

#customMessageBox>div {
    background-color: #fff;
    padding: 24px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    text-align: center;
    max-width: 380px;
    width: 90%;
}

#messageBoxText {
    font-size: 1.1em;
    font-weight: 600;
    margin-bottom: 20px;
    color: #333;
}

#messageBoxConfirmBtn,
#messageBoxCancelBtn {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.2s ease;
}

#messageBoxConfirmBtn {
    background-color: #007bff;
    color: white;
}

#messageBoxConfirmBtn:hover {
    background-color: #0056b3;
}

#messageBoxCancelBtn {
    background-color: #e0e0e0;
    color: #333;
    margin-left: 10px;
}

#messageBoxCancelBtn:hover {
    background-color: #c0c0c0;
}

/* 유틸리티 클래스 (hidden) */
.hidden {
    display: none !important;
}

/* 🔷 생년월일 및 닉네임 입력 공통 스타일 */
.stylish-input {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border: 1px solid #c4d7e0;
    border-radius: 12px;
    background-color: #ffffff;
    color: #333;
    outline: none;
    transition: border 0.2s ease-in-out;
    box-sizing: border-box;
}

.stylish-input:focus {
    border-color: #66afe9;
    box-shadow: 0 0 0 3px rgba(102, 175, 233, 0.2);
}

.back-button {
    background: none;
    border: none;
    font-size: 0.95rem;
    color: var(--text-dark);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;

    padding: 8px 14px;
    border-radius: 25px;
    box-shadow: 0 2px 5px var(--shadow-color-light);
    background-color: #f5f5f5;

    /* 위치 고정 */
    margin-left: 0;
    margin-right: auto;
    /* 왼쪽 정렬 */
}

.back-button:hover {
    background-color: #e8e8e8;
    transform: translateY(-2px);
    color: var(--text-dark);
    box-shadow: 0 4px 8px var(--shadow-color-light);
}