@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;600;800&family=Inter:wght@300;400;500;700&display=swap');

:root {
    --bg-color: #0f172a;
    --text-color: #f8fafc;
    --accent-color: #38bdf8;
    --accent-secondary: #818cf8;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --slide-padding: 4rem;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
    display: flex;
    justify-content: center;
    align-items: center;
    background-image:
        radial-gradient(circle at 10% 20%, rgba(56, 189, 248, 0.1) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(129, 140, 248, 0.1) 0%, transparent 40%);
}

.presentation-container {
    width: 100%;
    height: 100%;
    position: relative;
}

/* Slides */
.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1), transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--slide-padding);
    transform: scale(0.95);
    z-index: 1;
}

.slide.active {
    opacity: 1;
    visibility: visible;
    transform: scale(1);
    z-index: 2;
}

.slide-content {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 3rem 4rem;
    border-radius: 24px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    max-width: 1200px;
    width: 90%;
    max-height: 85vh;
    overflow-y: hidden;
    text-align: center;
    position: relative;
    overflow: hidden;
}

/* Typography */
h1 {
    font-family: 'Outfit', sans-serif;
    font-size: 3.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-secondary));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

h2 {
    font-family: 'Outfit', sans-serif;
    font-size: 2.5rem;
    color: white;
    margin-bottom: 1.5rem;
}

h3 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.8rem;
    color: #e2e8f0;
    margin-bottom: 1rem;
    margin-top: 1.5rem;
}

p {
    font-size: 1.25rem;
    line-height: 1.8;
    color: #cbd5e1;
    margin-bottom: 1.5rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

ul {
    text-align: left;
    display: inline-block;
    font-size: 1.2rem;
    color: #cbd5e1;
    margin-bottom: 1.5rem;
    list-style-type: none;
}

ul li {
    margin-bottom: 0.8rem;
    padding-left: 1.5rem;
    position: relative;
}

ul li::before {
    content: "•";
    color: var(--accent-color);
    font-size: 1.5rem;
    position: absolute;
    left: 0;
    top: -0.2rem;
}

/* Images */
.slide-image {
    max-width: 100%;
    height: auto;
    max-height: 400px;
    border-radius: 12px;
    margin: 2rem 0;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    object-fit: cover;
}

/* Navigation */
.controls {
    position: absolute;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    gap: 1rem;
    z-index: 10;
}

button {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    transition: all 0.2s;
    backdrop-filter: blur(5px);
}

button:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
    border-color: var(--accent-color);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Progress Bar */
.progress-container {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    z-index: 10;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-color), var(--accent-secondary));
    width: 0%;
    transition: width 0.3s ease;
}

.slide-number {
    position: absolute;
    bottom: 2rem;
    left: 2rem;
    color: rgba(255, 255, 255, 0.5);
    font-family: 'Outfit', sans-serif;
    font-size: 1.2rem;
    z-index: 10;
}

/* grid layout for some slides */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    text-align: left;
    align-items: center;
}

.grid-2 p {
    margin-left: 0;
}

@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 2rem;
    }

    .slide-content {
        padding: 2rem;
        width: 95%;
    }

    .grid-2 {
        grid-template-columns: 1fr;
    }
}