/* ============================= */
/* 기본 초기화 */
/* ============================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans KR', sans-serif;
    line-height: 1.6;
    color: #fff;
    background: radial-gradient(ellipse at bottom, #0b1d3a 0%, #000814 70%);
    overflow-x: hidden;
    position: relative;
}

/* ============================= */
/* 컨테이너 */
/* ============================= */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

/* ============================= */
/* 헤더 */
/* ============================= */
header {
    background: rgba(10,15,30,0.8);
    backdrop-filter: blur(10px);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

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

.logo {
    font-size: 24px;
    font-weight: bold;
    color: #fff;
}

.logo span {
    color: #00bfff;
    text-shadow: 0 0 10px #00bfff;
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 25px;
}

nav ul li a {
    text-decoration: none;
    color: #ccc;
    font-weight: 500;
    transition: 0.3s;
}

nav ul li a:hover {
    color: #00bfff;
}

/* ============================= */
/* 버튼 */
/* ============================= */
.btn-primary {
    background: linear-gradient(45deg, #007bff, #8a2be2);
    color: #fff;
    padding: 10px 22px;
    border-radius: 30px;
    text-decoration: none;
    transition: 0.3s;
    box-shadow: 0 0 15px rgba(0,123,255,0.4);
}

.btn-primary:hover {
    box-shadow: 0 0 25px rgba(138,43,226,0.8);
    transform: translateY(-2px);
}

.btn-main {
    background: transparent;
    border: 2px solid #00bfff;
    color: #fff;
    padding: 15px 35px;
    border-radius: 30px;
    text-decoration: none;
    display: inline-block;
    transition: 0.3s;
}

.btn-main:hover {
    background: #00bfff;
    color: #000;
    box-shadow: 0 0 20px #00bfff;
}

/* ============================= */
/* 히어로 */
/* ============================= */
.hero {
    padding: 120px 0;
    background:
        radial-gradient(circle at 30% 30%, rgba(0,123,255,0.3), transparent 40%),
        radial-gradient(circle at 70% 70%, rgba(138,43,226,0.3), transparent 40%);
}

.hero-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 60px;
}

.hero-text {
    flex: 1;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
}

.hero h1 span {
    color: #00bfff;
    text-shadow: 0 0 15px #00bfff;
}

.hero p {
    font-size: 18px;
    max-width: 600px;
    margin-bottom: 30px;
    color: #ccc;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* 3D 캔버스 반응형 */
#ai-3d-canvas,
#about-3d-canvas {
    width: 100%;
    max-width: 500px;
    aspect-ratio: 1 / 1;
}

/* ============================= */
/* 섹션 공통 */
/* ============================= */
section {
    padding: 100px 0;
}

h2 {
    text-align: center;
    font-size: 34px;
    margin-bottom: 50px;
    color: #fff;
}

/* ============================= */
/* 카드 */
/* ============================= */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.feature-card {
    background: rgba(255,255,255,0.05);
    backdrop-filter: blur(15px);
    padding: 30px;
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.15);
    transition: all 0.4s ease;
}

.feature-card:hover {
    transform: translateY(-15px);
    box-shadow: 0 0 30px rgba(0,123,255,0.6);
}

/* ============================= */
/* 산업 섹션 */
/* ============================= */
.industry-list {
    display: flex;
    justify-content: space-between;
    gap: 25px;
    text-align: center;
    flex-wrap: wrap;
}

.ind-item {
    flex: 1;
    min-width: 250px;
    background: rgba(255,255,255,0.05);
    padding: 25px;
    border-radius: 15px;
    border: 1px solid rgba(255,255,255,0.15);
    transition: 0.3s;
}

.ind-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 0 25px rgba(138,43,226,0.6);
}

/* ============================= */
/* 푸터 */
/* ============================= */
footer {
    background: #000814;
    color: #aaa;
    text-align: center;
    padding: 50px 0;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.about-text p {
    margin-bottom: 20px;
    color: #ddd;
    line-height: 1.8;
}

.about-text strong {
    color: #00bfff;
}

/* ============================= */
/* 반응형 */
/* ============================= */

/* 태블릿 */
@media (max-width: 992px) {

    .hero-content {
        flex-direction: column;
        text-align: center;
    }

    .hero h1 {
        font-size: 38px;
    }

    .hero p {
        font-size: 16px;
        margin: 0 auto 30px;
    }

    .hero-image {
        margin-top: 40px;
    }
}

/* 모바일 */
@media (max-width: 576px) {

    .hero {
        padding: 80px 0;
    }

    .hero h1 {
        font-size: 28px;
    }

    h2 {
        font-size: 24px;
    }

    nav ul {
        display: none; /* 필요 시 햄버거 메뉴로 교체 */
    }

    .btn-main {
        padding: 12px 24px;
    }
	#ai-3d-canvas,
    #about-3d-canvas {
        max-width: 320px;   /* 원하는 크기로 조절 */
    }
}