/* Base Document Variables */
:root {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --accent-color: #4CAF50;
    --slide-bg: #2d2d2d;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    --font-heading: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

    --code-bg: #111;
    --header-color: #ffffff;
    --table-border: #444;
    --table-hover: rgba(255, 255, 255, 0.03);
    --input-bg: #333;
    --control-bg: rgba(0, 0, 0, 0.7);
    --secondary-bg: #222;
    --border-color: #444;
}

/* Light Theme Overrides */
body.light-theme {
    --bg-color: #f5f5f7;
    --text-color: #1d1d1f;
    --slide-bg: #ffffff;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --code-bg: #f5f5f5;
    --header-color: #000000;
    --table-border: #e0e0e0;
    --table-hover: rgba(0, 0, 0, 0.03);
    --input-bg: #ffffff;
    --control-bg: rgba(255, 255, 255, 0.9);
    --secondary-bg: #f0f0f0;
    --border-color: #e0e0e0;
}

body,
html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-body);
    overflow: hidden;
    transition: background-color 0.3s, color 0.3s;
}

/* Presentation Container (Centers the current slide) */
#presentation-container {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100vw;
    height: 100vh;
    perspective: 1000px;
}

/* Individual Slide Styling */
.slide {
    display: none;
    width: 80vw;
    max-width: 1200px;
    height: 80vh;
    background-color: var(--slide-bg);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 20px 60px;
    box-sizing: border-box;
    overflow-y: auto;
    font-size: 1.5rem;
    line-height: 1.6;
    transition: background-color 0.3s, box-shadow 0.3s;
}

.slide.active {
    display: block;
    animation: fade-in 0.3s ease-out forwards;
}

/* Typography inside slides */
.slide h1,
.slide h2,
.slide h3 {
    font-family: var(--font-heading);
    color: var(--header-color);
    margin-top: 0;
    transition: color 0.3s;
}

.slide h1 {
    font-size: 3rem;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 10px;
    margin-bottom: 15px;
}

.slide h2 {
    font-size: 2.2rem;
}

.slide code {
    background-color: var(--code-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    transition: background-color 0.3s;
}

.slide pre {
    background-color: var(--code-bg);
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
    font-size: 1.2rem;
    transition: background-color 0.3s;
}

.slide blockquote {
    border-left: 5px solid var(--accent-color);
    margin-left: 0;
    padding-left: 20px;
    color: var(--text-color);
    opacity: 0.7;
    font-style: italic;
}

/* Table Styling */
.slide table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 1.3rem;
}

.slide th,
.slide td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--table-border);
    transition: border-bottom 0.3s;
}

.slide th {
    background-color: rgba(127, 127, 127, 0.05);
    color: var(--accent-color);
    font-weight: bold;
    border-bottom: 2px solid var(--accent-color);
}

.slide tbody tr:hover {
    background-color: var(--table-hover);
}

/* Informational Callouts */
.callout-box {
    background: var(--secondary-bg);
    padding: 15px;
    border-radius: 8px;
    margin-top: 20px;
    margin-bottom: 20px;
    border-left: 4px solid var(--accent-color);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.callout-box h4 {
    margin-top: 0 !important;
    margin-bottom: 10px !important;
    color: #ff9800 !important;
}

.callout-box p {
    margin: 0 !important;
    font-size: 1.1rem;
    color: var(--text-color);
}

.small-text,
.small-text * {
    font-size: 0.9em !important;
    line-height: 1.4 !important;
}

.static-timeline-wrapper {
    background: var(--slide-bg) !important;
    border: 1px solid var(--border-color) !important;
    padding-top: 20px;
    padding-bottom: 10px;
}

/* Theme Toggle Button */
#theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    background-color: var(--control-bg);
    color: var(--text-color);
    border: 1px solid var(--table-border);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    z-index: 900;
    /* Below overlays (1000) */
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

#theme-toggle:hover {
    transform: scale(1.1);
    background-color: var(--accent-color);
    color: white;
}

/* Navigation Controls Overlay */
#controls {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--control-bg);
    padding: 10px 20px;
    border-radius: 30px;
    display: flex;
    gap: 20px;
    align-items: center;
    z-index: 100;
    color: var(--text-color);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transition: all 0.3s;
}

#controls button {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.1rem;
    cursor: pointer;
    padding: 5px 10px;
}

#controls button:hover {
    color: var(--accent-color);
}

#slide-counter {
    font-size: 1.1rem;
    font-weight: bold;
}

/* Full-Screen Interactive Sandbox Overlay */
#demo-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: var(--bg-color);
    z-index: 1000;
    display: flex;
    flex-direction: column;
}

#demo-overlay.hidden {
    display: none;
}

#demo-header {
    height: 60px;
    background-color: #111;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 30px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.8);
}

#demo-title {
    font-size: 1.4rem;
    font-weight: bold;
    color: #fff;
}

#close-demo-btn {
    background-color: #e53935;
    color: white;
    border: none;
    padding: 8px 16px;
    font-size: 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
}

#close-demo-btn:hover {
    background-color: #c62828;
}

#demo-iframe {
    flex-grow: 1;
    width: 100%;
    border: none;
    background-color: white;
}