:root {
    --bg-color: #ffffff;
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    --card-bg: #f5f5f7;
    --border-color: #d2d2d7;
    --theme-color: #0066cc;
    --accent-glow: rgba(0, 102, 204, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Icons", "Helvetica Neue", "Helvetica", "Arial", sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.45;
    overflow: hidden;
    letter-spacing: -0.01em;
    -webkit-font-smoothing: antialiased;
}

/* Background elements */
.background-elements {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background: #ffffff;
}

#bg-canvas {
    width: 100%;
    height: 100%;
    display: block;
    opacity: 1;
    pointer-events: none;
}

/* Slides Container */
.slides-container {
    height: 100vh;
    width: 100vw;
    overflow-y: scroll;
    scroll-snap-type: y mandatory;
    scroll-behavior: smooth;
    scrollbar-width: none;
}
.slides-container::-webkit-scrollbar {
    display: none;
}

/* Slide Section */
.slide {
    height: 100vh;
    width: 100vw;
    scroll-snap-align: start;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 4rem;
}

/* Side Nav */
.slide-nav {
    position: fixed;
    right: 40px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 100;
}

.slide-nav ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.slide-nav a {
    display: block;
    width: 6px;
    height: 6px;
    background-color: #d2d2d7;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.slide-nav a.active {
    background-color: var(--text-primary);
    transform: scale(2);
}

/* Large PPT Slide Content */
.ppt-content {
    width: 100%;
    max-width: 1200px;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    opacity: 0;
    transform: translateY(30px);
    transition: all 1s cubic-bezier(0.16, 1, 0.3, 1);
}

.slide.visible .ppt-content {
    opacity: 1;
    transform: translateY(0);
}

/* Typography */
.slide-title {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 2rem;
    letter-spacing: -0.03em;
    line-height: 1.1;
}

.slide-subtitle {
    font-size: 1.8rem;
    color: var(--text-secondary);
    font-weight: 400;
    margin-bottom: 3rem;
}

.large-list {
    list-style: none;
}

.large-list li {
    font-size: 2.2rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    padding-left: 0;
}

.desc-text {
    font-size: 2rem;
    color: var(--text-secondary);
    max-width: 900px;
}

/* Image Slide - Full Focus */
.image-focus {
    width: 100%;
    height: 70vh;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    padding: 2rem;
    background: #f5f5f7;
    border-radius: 30px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0,0,0,0.05);
}

.image-focus img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 12px;
    transition: transform 0.6s ease;
    box-shadow: 0 10px 25px rgba(0,0,0,0.08);
}

.image-focus:hover img {
    transform: scale(1.03);
}

/* Image Label */
.image-label {
    margin-top: 2rem;
    text-align: center;
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Outline Style */
.outline-container {
    display: flex;
    flex-direction: column;
    gap: 4rem;
}

.outline-row {
    display: flex;
    align-items: center;
    gap: 3rem;
}

.outline-num {
    font-size: 5rem;
    font-weight: 700;
    color: #e5e5e5;
}

.outline-text {
    font-size: 3rem;
    font-weight: 600;
}

/* Grid for Team Summary Slide */
.summary-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.summary-item h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--theme-color);
}

.summary-item p {
    font-size: 1.3rem;
    color: var(--text-secondary);
}

/* Modal */
.modal {
    background-color: rgba(255, 255, 255, 0.98);
}

/* Responsive */
@media (max-width: 1024px) {
    .slide-title { font-size: 3rem; }
    .large-list li { font-size: 1.5rem; }
    .desc-text { font-size: 1.4rem; }
    .slide { padding: 2rem; }
}