/* --- 기본 리셋 및 폰트 --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Montserrat', sans-serif;
}

body {
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

/* --- 공통 스타일 --- */
.content-section {
    padding: 100px 8%;
    text-align: center;
}

.content-section h2 {
    font-size: 2.8em;
    font-weight: 700;
    margin-bottom: 20px;
    color: #1a1a1a;
}

.dark-bg {
    background-color: #1a1a1a;
    color: white;
}

.highlight {
    color: #ad6b19; /* 포인트 컬러 */
}

/* --- 1. 헤더 (고정 및 반응형) --- */
#header {
    position: fixed;
    top: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 8%;
    background: white;
    box-shadow: 0 1px 10px rgba(0, 0, 0, 0.05);
    z-index: 1000;
}

#header .logo {
    font-size: 1.5em;
    font-weight: 700;
    color: #FF4500;
}

/* PC 메뉴 스타일 */
.nav-menu a {
    text-decoration: none;
    color: #333;
    margin-left: 25px;
    font-weight: 600;
    transition: color 0.3s;
}

/* 메뉴 hover시 변하는 색상 */
.nav-menu a:hover {
    color: #ad6b19;
}

/* 햄버거 버튼 (기본 숨김) */
.hamburger-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5em;
    cursor: pointer;
    color: #333;
}

/* --- 2. 홈/인트로 섹션 --- */
.hero-section {
    /*  */
    background: url('콘서트_메인_이미지.jpg') no-repeat center center/cover; /* 실제 이미지 URL로 교체하세요 */
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    color: white;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6); 
    z-index: 1;
}

.content-wrapper {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 900px;
    padding: 0 5%;
}

.hero-section h1 {
    font-size: 3.8em;
    line-height: 1.2;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.cta-button {
    display: inline-block;
    padding: 12px 30px;
    background-color: #FF4500;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 700;
    margin-top: 30px;
    transition: background-color 0.3s;
}

/* --- 3. 회사 소개 (CEO Message) --- */
.message-box {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px;
    border: 1px solid #ddd;
    border-radius: 10px;
    text-align: left;
    font-style: italic;
    background: #f9f9f9;
}

.message-box .signature {
    margin-top: 20px;
    font-style: normal;
    text-align: right;
    font-weight: bold;
    color: #555;
}

/* --- 4. 비전 및 연혁 --- */
.vision-section {
    /*  */
    background: linear-gradient(rgba(26, 26, 26, 0.85), rgba(26, 26, 26, 0.85)), url('비전_배경.jpg') no-repeat center center/cover; /* 배경 이미지 URL로 교체 */
}

.vision-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    max-width: 1200px;
    margin: 40px auto;
}

.vision-item {
    padding: 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* 타임라인 스타일 */
.timeline {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 800px;
    margin: 60px auto;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 3px;
    background: #FF4500;
    transform: translateY(-50%);
}

.year-item {
    position: relative;
    width: 30%;
}

.year-item .year {
    display: block;
    font-size: 1.5em;
    font-weight: bold;
    color: #FF4500;
    margin-bottom: 5px;
}

.year-item .desc {
    display: block;
    font-size: 0.9em;
}

/* --- 5. 사업 영역 --- */
.business-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    max-width: 1200px;
    margin: 40px auto;
}

.business-card {
    padding: 30px;
    border: 1px solid #eee;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s, box-shadow 0.3s;
}

.business-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(255, 69, 0, 0.15);
}

.business-card i {
    font-size: 3em;
    color: #FF4500;
    margin-bottom: 20px;
}

/* --- 6. 문의 및 연락처 --- */
.contact-section {
    color: white;
}

.contact-form {
    max-width: 500px;
    margin: 0 auto;
    text-align: left;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 15px;
    margin-bottom: 20px;
    border: 1px solid #555;
    background: #333;
    color: white;
    border-radius: 5px;
}

.submit-btn {
    width: 100%;
    border: none;
    cursor: pointer;
}

/* --- 7. 푸터 --- */
footer {
    background-color: #000;
    color: #ccc;
    padding: 30px 5%;
    text-align: center;
    font-size: 0.9em;
}

/* ================================== */
/* --- 반응형 웹 디자인 (모바일 전용) --- */
/* ================================== */
@media (max-width: 768px) {
    /* 햄버거 메뉴 관련 */
    .nav-menu {
        display: none;
        position: absolute;
        top: 60px; /* 헤더 높이에 맞게 조정 */
        left: 0;
        width: 100%;
        background: rgba(255, 255, 255, 0.98);
        box-shadow: 0 5px 5px rgba(0, 0, 0, 0.1);
        padding: 10px 0;
    }

    .nav-menu.active {
        display: block; /* JS로 활성화될 때 나타남 */
    }
    
    .nav-menu a {
        display: block;
        margin: 0;
        padding: 15px 0;
        border-bottom: 1px solid #eee;
        color: #333;
    }

    .hamburger-btn {
		z-index:1001;
        display: block; /* 햄버거 버튼 활성화 */
    }

    /* 레이아웃 변경 */
    .hero-section h1 {
        font-size: 2.2em; /* 모바일에서 폰트 크기 조정 */
    }

    .vision-grid, .business-grid {
        grid-template-columns: 1fr; /* 1열로 변경 */
    }

    .timeline {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .timeline::before {
        height: 100%;
        width: 3px;
        left: 10px;
        top: 0;
        transform: none;
    }

    .year-item {
        width: 100%;
        text-align: left;
        padding-left: 30px;
        margin-bottom: 20px;
    }
    
    .year-item .year {
        position: absolute;
        left: 0;
        background: #1a1a1a;
        padding: 5px 10px;
        border-radius: 5px;
        margin: 0;
    }
}


/* ================================== */
/* --- 애니메이션 CSS (스크롤 시 나타나기) --- */
/* ================================== */
.fade-in, .fade-in-up {
    opacity: 0;
    transition: opacity 1s ease-out, transform 1s ease-out;
    transform: translateY(30px);
}

.fade-in.active {
    opacity: 1;
    transform: translateY(0);
}

.fade-in-up.active {
    opacity: 1;
    transform: translateY(0);
}