/* 기본 초기화 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Noto Sans KR", sans-serif;
}

body {
    background: #111;
    color: #eee;
}

/* ===========================
   HEADER
=========================== */
.header {
    width: 100%;
    padding: 15px 20px;
    background: #000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: fixed;
    top: 0;
    z-index: 999;
}

/* 로고 반응형 */
.logo {
    max-width: 120px;
    border-radius: 10%;
}

/* 모바일  → 작은 로고 */
@media (max-width: 480px) {
    .logo {
        max-width: 70px;
        border-radius: 10%;
    }
}

/* 태블릿 */
@media (min-width: 768px) {
    .logo {
        max-width: 150px;
        border-radius: 10%;
    }
}

/* 데스크탑 */
@media (min-width: 1024px) {
    .logo {
        max-width: 120px;
        border-radius: 10%;
    }
}

/* 메뉴 */
.nav {
    display: flex;
    gap: 18px;
}

.nav li {
    list-style: none;
}

.nav a {
    text-decoration: none;
    color: #eee;
    font-size: 14px;
    font-weight: 500;
}

/* 데스크탑 폰트 */
@media (min-width: 1024px) {
    .nav a {
        font-size: 16px;
    }
}

/* ===========================
   HERO (인트로)
=========================== */
.hero {
    height: 70vh;
    background: linear-gradient(135deg, #1b1b1b, #222);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding-top: 120px;
    padding-left: 20px;
    padding-right: 20px;
}

.hero h1 {
    font-size: 36px;
    margin-bottom: 15px;
}

.hero p {
    font-size: 16px;
    margin-bottom: 25px;
    color: #ccc;
}

.btn-start {
    padding: 12px 25px;
    background: #27a6ff;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    color: white;
    cursor: pointer;
}

/* 태블릿 */
@media (min-width: 768px) {
    .hero h1 { font-size: 48px; }
    .hero p { font-size: 18px; }
    .btn-start { font-size: 17px; }
}

/* 데스크탑 */
@media (min-width: 1024px) {
    .hero h1 { font-size: 54px; }
    .hero p { font-size: 20px; }
    .btn-start { font-size: 18px; }
}

/* ===========================
   SECTION 기본 Layout
=========================== */
.section {
    padding: 70px 20px;
    border-top: 1px solid #333;
}

.section h2 {
    font-size: 26px;
    margin-bottom: 12px;
}

.section p {
    margin-bottom: 25px;
    color: #ccc;
    font-size: 15px;
}

/* 태블릿 */
@media (min-width: 768px) {
    .section {
        padding: 90px 40px;
    }
    .section h2 {
        font-size: 30px;
    }
    .section p {
        font-size: 17px;
    }
}

/* 데스크탑 */
@media (min-width: 1024px) {
    .section h2 { font-size: 34px; }
    .section p { font-size: 18px; }
}

/* ===========================
   CONTENT BOX (이미지 + 리스트)
=========================== */
.content-box {
    display: flex;
    flex-direction: column;
    gap: 25px;
    align-items: center;
}

/* 태블릿부터는 좌우 나누기 */
@media (min-width:768px) {
    .content-box {
        flex-direction: row;
        gap: 40px;
    }
}

.content-box.reverse {
    flex-direction: column-reverse;
}

/* 태블릿 이상 reverse 적용 */
@media (min-width:768px) {
    .content-box.reverse {
        flex-direction: row-reverse;
    }
}

/* 이미지 반응형 */
.content-box img {
    width: 100%;
    max-width: 400px;
    border-radius: 10px;
    background: #222;
    padding: 10px;
}

/* 리스트 */
.content-box ul {
    width: 100%;
}

.content-box ul li {
    margin-bottom: 10px;
    font-size: 16px;
}

/* 데스크탑 */
@media (min-width:1024px) {
    .content-box img {
        max-width: 450px;
    }
    .content-box ul li {
        font-size: 18px;
    }
}

/* ===========================
   FOOTER
=========================== */
.footer {
    text-align: center;
    padding: 20px;
    background: #000;
    color: #888;
    margin-top: 50px;
    font-size: 14px;
}

@media (min-width: 1024px) {
    .footer { font-size: 15px; }
}