:root {
    --background-color: #f8f8f8;
    --text-color: #333;
    --highlight-color: #000;
    --secondary-text-color: #888;
    --card-border-color: #e0e0e0;
    --alert-bg-color: #fff5f5;
    --alert-border-color: #e53e3e;
}

body {
    font-family: 'Pretendard', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    line-height: 1.5; /* 가독성을 위해 추가 */
}

a { text-decoration: none; color: inherit; }
ul, dl { list-style: none; margin: 0; padding: 0; }

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 56px; /* 오타 수정: 24x -> 24px */
    background-color: white;
    border-bottom: 1px solid var(--card-border-color);
}

/* 로고 스타일 보강 */
.logo a {
    font-family: 'Inter', 'Pretendard', sans-serif;
    font-size: 26px;
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--highlight-color);
}
.logo a span {
    color: #999;
}

nav ul {
    display: flex;
    gap: 40px;
}

nav a {
    font-size: 16px;
    color: var(--text-color);
}

nav a.active {
    font-weight: bold;
}

.icons {
    display: flex;
    gap: 20px;
}

/* Lucide 아이콘 색상 및 크기 조정 */
.icons i {
    width: 20px;
    height: 20px;
    stroke: var(--text-color);
}

main {
    padding: 40px;
}

/* Hero 섹션 반응형 수정 */
.hero {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    align-items: center;
    gap: 40px;
    margin-bottom: 80px;
    background-color: white;
    padding: 60px;
}

.hero-text .lead {
    font-size: 36px;
    color: var(--secondary-text-color);
    margin: 0;
}

.hero-text h1 {
    font-size: clamp(40px, 8vw, 96px); /* 화면 크기에 따라 글자 크기 자동 조절 */
    font-weight: bold;
    margin: 0;
    line-height: 1;
    color: var(--secondary-text-color);
}

.hero-text .highlight {
    color: var(--highlight-color);
}

.hero-text p:last-child {
    font-size: 18px;
    margin-top: 20px;
}

.hero-image {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

/* Slideshow */
.slideshow-container {
    position: relative;
    height: 400px;
}

.slideshow-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    opacity: 0;
    transition: opacity 1s ease-in-out;
}

.slideshow-image.active {
    opacity: 1;
}

/* 기능 카드 그리드 수정 */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.feature-card {
    background-color: white;
    padding: 30px;
    border: 1px solid var(--card-border-color);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
}

.feature-card h2 {
    font-size: 20px;
    margin: 0 0 10px 0;
}

.feature-card h2 span {
    color: var(--secondary-text-color);
    display: block;
    font-size: 16px;
    margin-bottom: 5px;
}

.feature-card p {
    margin: 0;
    color: var(--secondary-text-color);
    flex-grow: 1;
}

.feature-card a {
    font-size: 24px;
    margin-top: 20px;
    align-self: flex-end;
}

/* Guide Page 레이아웃 수정 */
.guide-container {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 60px;
    padding: 40px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.sub-nav {
    position: sticky;
    top: 40px;
    height: fit-content;
}

.sub-nav ul {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.sub-nav a {
    font-size: 16px;
    color: var(--secondary-text-color);
}

.sub-nav a.active {
    font-weight: bold;
    color: var(--highlight-color);
}

.guide-content section {
    margin-bottom: 80px;
    scroll-margin-top: 40px;
}

.guide-content h2 {
    font-size: 32px;
    margin-bottom: 20px;
}

.guide-content > p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-color);
}

.definition-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    align-items: center;
}

.definition-text p {
    margin-bottom: 20px;
}

@media (max-width: 768px) {
    .guide-container {
        grid-template-columns: 1fr;
    }
    .hero { padding: 30px; }
    header { padding: 20px; }
    .slideshow-container { height: 300px; }
}
.dropdown {
    position: relative;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #ffffff;
    min-width: 180px; 
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.1);
    z-index: 1;
    padding: 15px 0;
    margin-top: 24px; 
    border-radius: 4px; 
    border: 1px solid var(--card-border-color);
}


.dropdown:hover .dropdown-content {
    display: block;
}


.dropdown-content a {
    color: var(--text-color);
    padding: 8px 25px;
    text-decoration: none;
    display: block;
    text-align: left;
}

.dropdown-content a:hover {
    font-weight: bold;

}


nav ul > li > a:hover {
    font-weight: bold;
}