:root {
    --primary-color: #1a252c;
    /* Dark Blue/Slate */
    --accent-color: #d4af37;
    /* Gold */
    --text-color: #ecf0f1;
    --bg-color: #2c3e50;
}

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

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--primary-color);
    color: var(--text-color);
    overflow: hidden;
    /* Prevent scrolling during presentation */
    height: 100vh;
    width: 100vw;
}

/* Container for slides */
.presentation-container {
    position: relative;
    height: 100%;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: radial-gradient(circle at center, var(--bg-color) 0%, var(--primary-color) 100%);
}

/* Individual Slide Styling */
.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    opacity: 0;
    transform: scale(0.95);
    transition: opacity 0.6s ease-in-out, transform 0.6s ease-in-out;
    pointer-events: none;
    padding: 20px 5%;
}

.slide.active {
    opacity: 1;
    transform: scale(1);
    pointer-events: all;
    z-index: 10;
}

/* Content Styling */
h1 {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    margin-bottom: 10px;
    color: var(--accent-color);
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.6);
    letter-spacing: 2px;
}

h2 {
    font-size: clamp(1.8rem, 3vw, 2.5rem);
    margin-bottom: 20px;
    border-bottom: 3px solid var(--accent-color);
    padding-bottom: 10px;
    display: inline-block;
    text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.5);
}

.content-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    max-width: 1000px;
    width: 100%;
}

.content-wrapper.vertical {
    flex-direction: column;
    align-items: center;
    gap: 20px;
    max-width: 1000px;
    width: 100%;
}

@media (min-width: 768px) {
    .content-wrapper.split {
        flex-direction: row;
        text-align: left;
        justify-content: space-between;
        align-items: center;
    }

    .content-wrapper.vertical {
        flex-direction: column;
        align-items: center;
        gap: 20px;
        max-width: 1000px;
        width: 100%;
    }

    .content-wrapper.split ul {
        text-align: left;
        width: 50%;
    }

    .content-wrapper.vertical ul {
        text-align: left;
        width: 100%;
    }

    .content-wrapper.split .image-container {
        width: 45%;
    }

    .content-wrapper.vertical .image-container {
        width: 100%;
    }
}

ul {
    list-style: none;
    font-size: clamp(1.2rem, 2vw, 1.8rem);
    line-height: 1.8;
    background: rgba(0, 0, 0, 0.3);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    width: 100%;
    max-width: 1000px;
    text-align: left;
    border-left: 4px solid var(--accent-color);
}

li {
    margin-bottom: 15px;
    padding-left: 30px;
    position: relative;
}

li::before {
    content: "✦";
    color: var(--accent-color);
    position: absolute;
    left: 0;
    top: 2px;
    font-size: 1.2em;
}

/* Image Styling */
.image-container {
    display: block;
    width: 100%;
    max-width: 1000px;
    height: 50vh;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.6);
    border: 2px solid rgba(212, 175, 55, 0.3);
    background-size: cover;
    background-position: center;
}

.image-container.vertical {
    height: 40vh;
}

img {
    width: 100%;
    height: auto;
    max-height: 45vh;
    object-fit: cover;
    display: block;
    transition: transform 0.3s ease;
}

img:hover {
    transform: scale(1.03);
}

.subtitle {
    font-size: clamp(1.2rem, 2vw, 1.8rem);
    color: #bdc3c7;
    margin-bottom: 30px;
}

.presenter {
    font-size: 1.2rem;
    color: #95a5a6;
    font-style: italic;
    margin-top: -20px;
    margin-bottom: 30px;
}

/* Footer/Controls */
.controls {
    position: absolute;
    bottom: 30px;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    z-index: 20;
    padding: 0 20px;
}

.btn {
    background: rgba(0, 0, 0, 0.5);
    border: 2px solid var(--accent-color);
    padding: 12px 24px;
    color: var(--accent-color);
    font-size: 1.2rem;
    cursor: pointer;
    border-radius: 30px;
    transition: all 0.3s;
    font-weight: bold;
    outline: none;
}

.btn:hover,
.btn:active {
    background: var(--accent-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.slide-number {
    font-size: 1.2rem;
    font-weight: bold;
    background: rgba(0, 0, 0, 0.5);
    padding: 8px 16px;
    border-radius: 20px;
    letter-spacing: 2px;
}

/* Progress Bar */
.progress-bar {
    position: absolute;
    top: 0;
    left: 0;
    height: 4px;
    background-color: var(--accent-color);
    width: 0%;
    transition: width 0.4s ease;
    z-index: 30;
}