:root {
    --bg-color: #f4f1ea; /* 차분한 종이 질감의 아이보리 */
    --text-main: #2a2a2a; /* 짙은 회색 */
    --accent-color: #7d6b5c; /* 지적이고 따뜻한 톤의 브라운 */
    --point-color: #bfa071; /* 골드 톤의 하이라이트 */
    --header-bg: rgba(244, 241, 234, 0.95);
    --card-bg: white;
    --tag-bg: #eee;
    --tag-text: #666;
    --hero-gradient: radial-gradient(circle at center, rgba(255,255,255,0.2) 0%, rgba(244,241,234,1) 70%);
    --serif: 'Noto Serif KR', serif;
    --sans: 'Noto Sans KR', sans-serif;
    --transition: 0.3s ease;
}

body.dark-mode {
    --bg-color: #1a1a1a;
    --text-main: #e0e0e0;
    --accent-color: #d4c4b5;
    --point-color: #d4af37;
    --header-bg: rgba(26, 26, 26, 0.95);
    --card-bg: #2d2d2d;
    --tag-bg: #444;
    --tag-text: #ccc;
    --hero-gradient: radial-gradient(circle at center, rgba(0,0,0,0.4) 0%, rgba(26,26,26,1) 70%);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: var(--sans);
    line-height: 1.8;
    word-break: keep-all; /* 한글 가독성 향상 */
    transition: background-color var(--transition), color var(--transition);
}

a { text-decoration: none; color: inherit; transition: var(--transition); }

/* 네비게이션 */
header {
    width: 100%;
    padding: 20px 50px;
    position: fixed;
    top: 0;
    background-color: var(--header-bg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    border-bottom: 1px solid rgba(0,0,0,0.05);
    transition: background-color var(--transition);
}

.logo {
    font-family: var(--serif);
    font-weight: 900;
    font-size: 1.4rem;
    color: var(--accent-color);
}

nav ul { list-style: none; display: flex; gap: 30px; align-items: center; }
nav a { font-size: 0.95rem; font-weight: 400; color: var(--text-main); opacity: 0.8; }
nav a:hover { color: var(--point-color); opacity: 1; }

/* 테마 토글 버튼 */
.theme-toggle {
    background: none;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    padding: 5px 12px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.8rem;
    font-family: var(--sans);
    transition: var(--transition);
}

.theme-toggle:hover {
    background-color: var(--accent-color);
    color: var(--bg-color);
}

/* 섹션 공통 */
section {
    padding: 120px 20px;
    max-width: 1100px;
    margin: 0 auto;
}

.section-title {
    font-family: var(--serif);
    font-size: 2.8rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 60px;
    color: var(--accent-color);
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background-color: var(--point-color);
    margin: 15px auto 0;
}

/* 서브 페이지 전용 스타일 */
.content-detail {
    margin-top: 80px;
    background-color: var(--card-bg);
    padding: 80px;
    border-radius: 4px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.03);
}

.text-block h3 {
    font-family: var(--serif);
    font-size: 1.6rem;
    margin: 40px 0 20px;
    color: var(--accent-color);
}

.text-block p {
    margin-bottom: 20px;
    color: var(--text-main);
    opacity: 0.9;
    font-size: 1.05rem;
}

.text-block ul {
    margin-bottom: 20px;
    padding-left: 20px;
}

.text-block li {
    margin-bottom: 10px;
}

/* Hero (메인 대문) */
.hero {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    background: 
        var(--hero-gradient),
        url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI0MCIgaGVpZ2h0PSI0MCIgdmlld0JveD0iMCAwIDQwIDQwIj48ZyBmaWxsLXJ1bGU9ImV2ZW5vZGQiPjxnIGZpbGw9IiM5Qzg5N0MiIGZpbGwtb3BhY2l0eT0iMC4wNSI+PHBhdGggZD0iTTAgMGg0MHY0MEgwVjB6bTIwIDIwaDIwdjIwSDIWMjB6TTAgMjBoMjB2MjBIMFYyMHoyMCAwaDIwdjIwSDIwVjB6Ii8+PC9nPjwvZz48L3N2Zz4='); /* 미세한 격자 패턴 */
}

.hero h1 {
    font-family: var(--serif);
    font-size: 4rem;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.hero h1 span { color: var(--accent-color); }

.hero p {
    font-size: 1.25rem;
    font-weight: 300;
    color: var(--text-main);
    opacity: 0.7;
    margin-bottom: 40px;
    max-width: 600px;
}

.cta-btn {
    display: inline-block;
    padding: 15px 35px;
    background-color: var(--accent-color);
    color: var(--bg-color);
    font-weight: 700;
    border-radius: 2px;
    font-size: 1rem;
}
.cta-btn:hover { background-color: var(--point-color); transform: translateY(-2px); }

/* Profile (자기소개) */
.profile {
    background-color: var(--card-bg);
    box-shadow: 0 10px 30px rgba(0,0,0,0.03);
    border-radius: 4px;
    padding: 80px;
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 50px;
    align-items: center;
    transition: background-color var(--transition);
}

.profile-text { text-align: left; }
.profile-text h3 { font-family: var(--serif); font-size: 1.8rem; margin-bottom: 20px; color: var(--point-color); }
.profile-text p { margin-bottom: 15px; color: var(--text-main); opacity: 0.9; }
.tags { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 25px; }
.tag { background: var(--tag-bg); padding: 5px 12px; border-radius: 20px; font-size: 0.85rem; color: var(--tag-text); }

/* Expertise (전문성) */
.expert-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.expert-card {
    background: var(--card-bg);
    padding: 40px;
    border-bottom: 4px solid var(--card-bg);
    transition: var(--transition);
    text-align: left;
    display: block;
}

.expert-card:hover { border-bottom: 4px solid var(--point-color); transform: translateY(-5px); }
.expert-card h4 { font-family: var(--serif); font-size: 1.4rem; color: var(--accent-color); margin-bottom: 15px; }
.expert-card p { font-size: 0.95rem; color: var(--text-main); opacity: 0.8; }
.more-link { display: inline-block; margin-top: 15px; color: var(--point-color); font-weight: 700; font-size: 0.9rem; }

/* Contact */
.contact { text-align: center; }
.contact p { font-size: 1.1rem; margin-bottom: 30px; color: var(--text-main); opacity: 0.8; }

/* Footer */
footer {
    background-color: var(--accent-color);
    color: var(--bg-color);
    opacity: 0.9;
    padding: 50px 20px;
    text-align: center;
    font-size: 0.9rem;
}

/* 반응형 */
@media (max-width: 900px) {
    .profile, .expert-grid { grid-template-columns: 1fr; }
    .hero h1 { font-size: 2.8rem; }
    header { padding: 15px 20px; }
    .content-detail { padding: 40px 20px; }
}