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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #f4a460 0%, #87ceeb 25%, #4682b4 50%, #4169e1 75%, #0000cd 100%);
    color: #333;
    overflow: hidden;
    min-height: 100vh;
}

.slide-container {
    width: 100vw;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.slide {
    display: none;
    width: 100%;
    max-width: 1400px;
    height: 90vh;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 0;
    padding: 50px 70px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    position: relative;
}

.slide.active {
    display: flex;
    flex-direction: column;
}

.os2-logo {
    position: absolute;
    bottom: 0px;
    right: 50px;
    width: 80px;
    height: 80px;
    background-image: url('../logo.png');
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
}

.slide-header {
    margin-bottom: 20px;
}

.slide-number {
    color: #666;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 5px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.slide-title {
    font-size: 28px;
    font-weight: 700;
    color: #2d2d2d;
    margin-bottom: 10px;
    line-height: 1.2;
}

.jira-link {
    display: inline-block;
    color: #2d2d2d;
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    padding: 6px 14px;
    border: 2px solid #2d2d2d;
    border-radius: 0;
    margin-top: 8px;
    transition: all 0.3s;
}

.jira-link:hover {
    background: #2d2d2d;
    color: white;
}

.slide-content {
    flex: 1;
    overflow-y: auto;
    padding-right: 100px;
    margin-bottom: 40px;
}

.content-section {
    margin-bottom: 25px;
}

.content-section h3 {
    color: #2d2d2d;
    font-size: 20px;
    margin-bottom: 12px;
    font-weight: 700;
}

.content-section p, .content-section ul {
    font-size: 16px;
    line-height: 1.6;
    color: #2d2d2d;
}

.content-section ul {
    margin-left: 25px;
}

.content-section li {
    margin-bottom: 8px;
}        

.screenshot-placeholder {
    background: #f5f5f5;
    border: 3px dashed #ccc;
    border-radius: 0;
    padding: 10px;
    text-align: center;
    color: #999;
    font-size: 18px;
    margin: 20px 0;
    font-weight: 600;
}

.screenshot {
    width: 100%;
}

.navigation {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 20px;
    z-index: 1000;
}

.nav-button {
    background: #2d2d2d;
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 16px;
    font-weight: 700;
    border-radius: 0;
    cursor: pointer;
    transition: all 0.3s;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav-button:hover:not(:disabled) {
    background: #4682b4;
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.3);
}

.nav-button:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
}
        
.intro-slide {
    text-align: center;
    justify-content: center;
    align-items: center;
}

.intro-slide .slide-title {
    font-size: 56px;
    margin-bottom: 15px;
}

.intro-slide .slide-subtitle {
    font-size: 28px;
    font-weight: 300;
    color: #2d2d2d;
    margin-bottom: 50px;
}

/* Index page styling */
.index-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 18px;
}

.index-item {
    color: #2d2d2d;
    text-decoration: none;
    padding: 2px;
    border-radius: 5px;
    transition: background-color 0.2s;
}

.index-item:hover {
    background-color: #f0f0f0;
    cursor:pointer;
}

.index-number {
    font-weight:800;
}

/* Index button styling */
#index-btn {
    margin: 0 10px;
}