:root {
    --bg: #FFFFFF;
    --text-primary: #000000;
    --text-secondary: #666666;
    --text-muted: #999999;
    --accent: #000000;
    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Noto Sans KR', sans-serif;
    --ease: cubic-bezier(0.16, 1, 0.3, 1);
    --border: #F0F0F0;
    --marquee-bg: #FAFAFA;
}

body.dark-mode {
    --bg: #111111;
    --text-primary: #FFFFFF;
    --text-secondary: #AAAAAA;
    --text-muted: #555555;
    --accent: #FFFFFF;
    --border: #222222;
    --marquee-bg: #1A1A1A;
}

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

body {
    background: var(--bg);
    color: var(--text-primary);
    font-family: var(--font-body);
    overflow: hidden;
    cursor: none;
    transition: background-color 0.5s var(--ease), color 0.5s var(--ease);
}

/* Custom Cursor */
.cursor {
    position: fixed;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 10000;
}

.cursor-dot {
    width: 4px;
    height: 4px;
    background: #000;
    border-radius: 50%;
    position: absolute;
    top: -2px;
    left: -2px;
}

.cursor-ring {
    width: 30px;
    height: 30px;
    border: 1px solid #000;
    border-radius: 50%;
    position: absolute;
    top: -15px;
    left: -15px;
    opacity: 0.3;
    transition: transform 0.2s var(--ease);
}

/* Slide Container */
.slide-container {
    height: 100vh;
    overflow-y: scroll;
    scroll-snap-type: y mandatory;
    scroll-behavior: smooth;
}

.slide-container::-webkit-scrollbar {
    display: none;
}

.slide {
    position: relative;
    height: 100vh;
    width: 100%;
    scroll-snap-align: start;
    scroll-snap-stop: always;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 0 8vw;
    border-bottom: 1px solid var(--border);
    transition: border-color 0.5s var(--ease);
}

/* Intro Slide */
.intro-content {
    max-width: 800px;
}

.intro-content h1 {
    font-family: var(--font-display);
    font-size: clamp(48px, 10vw, 120px);
    font-weight: 700;
    letter-spacing: -0.05em;
    line-height: 0.9;
    margin-bottom: 24px;
}

.intro-content p {
    font-size: clamp(14px, 2vw, 18px);
    color: var(--text-secondary);
    margin-top: 8px;
    letter-spacing: 0.05em;
}

.scroll-hint {
    position: absolute;
    bottom: 5vh;
    font-size: 10px;
    letter-spacing: 0.3em;
    color: var(--text-muted);
}

/* Project Slide */
.project-header {
    margin-bottom: 4vh;
    display: flex;
    align-items: baseline;
    gap: 20px;
    z-index: 5;
}

.project-num {
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-muted);
}

.project-header h2 {
    font-family: var(--font-display);
    font-size: clamp(24px, 4vw, 48px);
    font-weight: 600;
    letter-spacing: -0.02em;
}

/* Marquee Display */
.marquee-container {
    width: 100vw;
    margin-left: -8vw;
    overflow: hidden;
    position: relative;
}

.marquee-track {
    display: flex;
    gap: 20px;
    width: max-content;
    align-items: center;
    cursor: grab;
    user-select: none;
    will-change: transform;
}

.marquee-track:active {
    cursor: grabbing;
}

.marquee-track img, 
.marquee-track video {
    height: 50vh;
    width: auto;
    object-fit: contain;
    background: var(--marquee-bg);
    transition: background-color 0.5s var(--ease);
    pointer-events: none; /* Prevents native drag/context menu on images */
}

.marquee-track.marquee-cuz {
    animation-duration: 90s; /* Adjusted for higher item count to match visual speed */
}


/* Theme Toggle */
.theme-toggle {
    position: absolute;
    top: 5vh;
    left: 50%;
    transform: translateX(-50%);
    background: none;
    border: none;
    border-bottom: 1px solid var(--text-muted);
    font-family: var(--font-display);
    font-size: 10px;
    letter-spacing: 0.3em;
    color: var(--text-muted);
    padding: 8px 0;
    cursor: none;
    z-index: 100;
    transition: color 0.3s, border-color 0.3s;
}

.theme-toggle:hover {
    color: var(--text-primary);
    border-color: var(--text-primary);
}

/* Final Slide */
.final-content {
    text-align: center;
}

.final-content h2 {
    font-family: var(--font-display);
    font-size: clamp(32px, 6vw, 80px);
    font-weight: 700;
    letter-spacing: -0.04em;
    margin-bottom: 40px;
}

.final-links {
    margin-top: 24px;
    margin-bottom: 60px;
}

.back-link {
    font-family: var(--font-display);
    font-size: 14px;
    letter-spacing: 0.2em;
    color: var(--text-secondary);
    text-decoration: none;
    border-bottom: 1px solid var(--text-muted);
    padding-bottom: 4px;
    transition: color 0.3s, border-color 0.3s;
}

.back-link:hover {
    color: var(--text-primary);
    border-color: var(--text-primary);
}

.back-to-top {
    position: absolute;
    bottom: 5vh;
    left: 50%;
    transform: translateX(-50%);
    background: none;
    border: none;
    border-bottom: 1px solid var(--text-muted);
    font-family: var(--font-display);
    font-size: 14px;
    letter-spacing: 0.2em;
    color: var(--text-secondary);
    padding: 8px 0;
    cursor: none;
    transition: color 0.3s, border-color 0.3s;
}

.back-to-top:hover {
    color: var(--text-primary);
    border-color: var(--text-primary);
}

/* Text Scramble Utility */
.scramble-text {
    display: inline-block;
    min-height: 1em;
}