:root {
    --bg-color: #ffffff;
    --text-color: #1a1a1a;
    --text-light: #555555;
    --font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
    overflow-y: hidden;
}

.presentation {
    height: 100vh;
    width: 100vw;
    overflow-y: scroll;
    scroll-snap-type: y mandatory;
    scroll-behavior: smooth;
    -ms-overflow-style: none;
    scrollbar-width: none;
}
.presentation::-webkit-scrollbar {
    display: none;
}

.slide {
    height: 100vh;
    width: 100vw;
    scroll-snap-align: start;
    position: relative;
    padding: 60px 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.split-layout {
    display: flex;
    flex-direction: row;
    gap: 80px;
}

.content-left {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    max-width: 50%;
}

.content-right {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
}

.center-content {
    text-align: center;
    max-width: 1000px;
}

h1.main-title {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.35;
    letter-spacing: -0.02em;
    text-align: center;
}

h2 {
    font-size: 2.1rem;
    font-weight: 700;
    margin-bottom: 30px;
    letter-spacing: -0.02em;
    line-height: 1.4;
}

.overtitle {
    font-size: 1.05rem;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
    font-weight: 600;
}

p {
    font-size: 1.2rem;
    color: var(--text-color);
    margin-bottom: 20px;
    letter-spacing: -0.01em;
}

p.definition {
    font-size: 0.9rem;
    color: #888;
    margin-top: 5px;
    font-style: italic;
}

p.large-text {
    font-size: 1.8rem;
    color: var(--text-color);
    font-weight: 600;
    line-height: 1.6;
    margin-bottom: 35px;
}

.lang-kr { display: block; margin-bottom: 4px; }
.lang-en { 
    display: block; 
    font-size: 0.85em; 
    color: #777; 
    line-height: 1.4;
    font-weight: 400;
}

.content-right img {
    max-width: 100%;
    max-height: 75vh;
    object-fit: contain;
    border-radius: 12px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.08);
}

.multi-image {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.multi-image img {
    max-height: 38vh;
}

.video-container {
    width: 100%;
    aspect-ratio: 16 / 9;
    background: #000;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 15px 40px rgba(0,0,0,0.12);
}

.source-link {
    position: absolute;
    bottom: 35px;
    right: 50px;
    font-size: 0.8rem;
    color: #a0a0a0;
    text-decoration: none;
    text-align: right;
    white-space: nowrap;
    transition: color 0.2s ease;
    line-height: 1.4;
    z-index: 50;
}

a.source-link:hover {
    color: #333;
    text-decoration: underline;
}

.nav-indicator {
    position: fixed;
    bottom: 20px;
    left: 25px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-light);
    background: rgba(255, 255, 255, 0.7);
    padding: 6px 14px;
    border-radius: 30px;
    backdrop-filter: blur(8px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.04);
    z-index: 100;
}

.grouped-en {
    margin-top: 30px;
}

.grouped-en p.large-text {
    color: #888;
    font-weight: 500;
}