/* Base Reset & Variables */
:root {
    --color-primary: #004d40;
    /* Deep Green */
    --color-accent: #A89F68;
    /* Brand Gold (Secondary) */
    --color-accent-light: #F2F0E6;
    /* Very light gold for backgrounds */
    --color-text: #212121;
    --color-white: #ffffff;
    --color-grey: #fafafa;

    --font-heading: 'Playfair Display', serif;
    /* Elevated headings */
    --font-body: 'Outfit', sans-serif;
    /* Clean modern body */

    --slide-padding-x: 6vw;
    --slide-padding-y: 6vh;
    --transition-speed: 0.5s;
    --z-slide: 1;
    --z-active: 10;
    --z-controls: 100;
    --z-overview: 200;
}

* {
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-body);
    background-color: #051A16;
    /* Very Dark Green background for immersive feel */
    color: var(--color-text);
    margin: 0;
    padding: 0;
    overflow: hidden;
    height: 100vh;
    width: 100vw;
    display: flex;
    justify-content: center;
    align-items: center;
}

#app {
    width: 100%;
    height: 100%;
    position: relative;
    max-width: 1920px;
    max-height: 1080px;
    background: #000;
    box-shadow: 0 0 50px rgba(0, 0, 0, 0.5);
}

/* Slide Container */
#slide-container {
    width: 100%;
    height: 100%;
    position: relative;
    background: var(--color-white);
    overflow: hidden;
}

/* Individual Slide */
.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    padding: var(--slide-padding-y) var(--slide-padding-x);
    display: flex;
    flex-direction: column;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-speed) ease, transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
    transform: scale(1.05) translateY(20px);
    background: var(--color-white);
    z-index: var(--z-slide);
    pointer-events: none;
}

.slide.active {
    opacity: 1;
    visibility: visible;
    transform: scale(1) translateY(0);
    z-index: var(--z-active);
    pointer-events: auto;
}

/* Slide Gradient Decoration */
.slide::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 30vw;
    height: 30vh;
    background: radial-gradient(circle at top right, var(--color-accent-light), transparent 70%);
    z-index: -1;
    opacity: 0.6;
}

/* Slide Content Area */
.slide-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
}

/* Typography Scale */
h1 {
    font-family: var(--font-heading);
    color: var(--color-primary);
    font-size: 6vmin;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 0.5em;
    letter-spacing: -0.02em;
}

h2 {
    font-family: var(--font-heading);
    color: var(--color-primary);
    font-size: 4.5vmin;
    margin-bottom: 1em;
    position: relative;
    padding-bottom: 2vmin;
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 6vmin;
    height: 0.4vmin;
    background-color: var(--color-accent);
    border-radius: 2px;
}

h3 {
    font-size: 2.8vmin;
    margin-bottom: 0.8em;
    color: var(--color-primary);
    font-weight: 600;
}

p,
li,
.block,
.flow-step,
.card-content {
    font-size: 2.2vmin;
    line-height: 1.6;
}

p {
    margin-bottom: 1.5em;
    max-width: 900px;
    color: #444;
}

ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

ul li {
    margin-bottom: 1.5vmin;
    position: relative;
    padding-left: 3.5vmin;
}

/* Standard Bullets */
ul.bullets li::before {
    content: '✦';
    /* More elegant bullet */
    color: var(--color-accent);
    position: absolute;
    left: 0;
    font-size: 1.2em;
    top: -0.1em;
}

.subtitle {
    font-size: 3vmin;
    color: var(--color-accent);
    /* Use gold for subtitle */
    margin-bottom: 3em;
    font-weight: 400;
    font-family: var(--font-heading);
    font-style: italic;
}

/* New Tile/Card Grid System */
.tile-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3vmin;
    width: 100%;
    margin-top: 2em;
}

.tile {
    background: var(--color-white);
    border-left: 0.6vmin solid var(--color-accent);
    padding: 3vmin;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.03);
    border-radius: 0 1vmin 1vmin 0;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    align-items: flex-start;
    gap: 2vmin;
}

.tile:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.08);
}

.tile-icon {
    font-size: 3.5vmin;
    color: var(--color-primary);
    background: var(--color-accent-light);
    width: 6vmin;
    height: 6vmin;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    flex-shrink: 0;
}

.tile-content {
    display: flex;
    flex-direction: column;
}

.tile-title {
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.5em;
    font-size: 1.1em;
}

.tile-text {
    color: #555;
    font-size: 0.95em;
}

/* Layouts */
.four-block-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3vmin;
    width: 100%;
    margin-top: 2em;
}

.block {
    background-color: var(--color-gray);
    border: 1px solid rgba(0, 0, 0, 0.05);
    background: linear-gradient(145deg, #ffffff, #fafafa);
    border-radius: 1.5vmin;
    padding: 4vmin;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    font-weight: 600;
    color: var(--color-primary);
    transition: all 0.3s ease;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.03);
    position: relative;
    overflow: hidden;
}

.block::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--color-accent);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.block:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.06);
}

.block:hover::after {
    transform: scaleX(1);
}

.block.full-width {
    grid-column: span 2;
}

.block.highlight {
    background-color: var(--color-primary);
    color: var(--color-white);
    border: none;
}

.block.highlight::after {
    background: var(--color-white);
}

.icon {
    font-size: 4vmin;
    margin-bottom: 1.5vmin;
    display: block;
    color: var(--color-accent);
    /* Use Gold for icons */
}

/* Comparison Layout */
.comparison-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5vmin;
    width: 100%;
}

.column {
    background: white;
    border-radius: 1.5vmin;
    padding: 4vmin;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.04);
    border-top: 0.6vmin solid var(--color-accent);
}

.column h3 {
    border-bottom: 1px solid #eee;
    padding-bottom: 15px;
    margin-bottom: 25px;
}

.column.positive {
    border-color: var(--color-primary);
    background: #fdfdfd;
}

.column.negative {
    border-color: var(--color-accent);
    opacity: 0.9;
}

.column.strategic {
    border-color: var(--color-primary);
    background: var(--color-accent-light);
}

.column.operational {
    border-color: #999;
}

/* Flow Diagram */
.flow-diagram {
    display: flex;
    gap: 2vmin;
    width: 100%;
    margin-top: 2em;
}

.horizontal-flow {
    flex-direction: row;
}

.vertical-flow {
    flex-direction: column;
    max-width: 600px;
    margin-left: 0;
    /* Align left for cleaner look */
}

.flow-step {
    flex: 1;
    background: white;
    border: 1px solid var(--color-accent-light);
    color: var(--color-primary);
    padding: 2.5vmin;
    text-align: center;
    font-weight: 600;
    border-radius: 1vmin;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
    position: relative;
    transition: transform 0.2s;
}

.flow-step:hover {
    transform: translateX(5px);
    border-color: var(--color-accent);
}

/* Prompt Slides */
.prompt-slide .slide-content {
    align-items: center;
    text-align: center;
}

.prompt-text {
    font-size: 3.5vmin;
    margin-bottom: 1.5em;
    font-weight: 400;
    text-align: center;
    font-family: var(--font-heading);
    color: var(--color-primary);
    max-width: 1200px;
}

/* Footer & Branding */
.slide-footer {
    height: 10vmin;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    /* Softer border */
    margin-top: auto;
    width: 100%;
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
    padding-top: 2vmin;
}

.logo {
    font-weight: 700;
    color: var(--color-accent);
    /* Gold Logo */
    text-transform: uppercase;
    font-size: 1.6vmin;
    letter-spacing: 2px;
}

.slide-number {
    font-size: 1.6vmin;
    color: #999;
}

/* Controls */
.controls {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 80px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 40px;
    z-index: var(--z-controls);
    pointer-events: none;
}

.controls>div {
    pointer-events: auto;
}

.controls-center {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    gap: 20px;
    display: flex;
}

.nav-btn {
    background: var(--color-primary);
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--color-white);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    transition: all 0.2s;
}

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

.text-btn {
    background: white;
    border: 1px solid #eee;
    font-family: var(--font-body);
    font-size: 0.9em;
    color: var(--color-primary);
    cursor: pointer;
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: 1px;
    padding: 8px 16px;
    border-radius: 6px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.slide-indicator {
    display: none;
    /* Hide for cleaner look, footer handles it */
}

/* Overview - Fixed Visibility */
.overview-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #f4f4f4;
    /* Light grey bg */
    z-index: var(--z-overview);
    display: flex;
    flex-direction: column;
    padding: 40px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease;
}

.overview-grid.visible {
    opacity: 1;
    visibility: visible;
}

.overview-header h2 {
    color: var(--color-primary);
}

.slide-thumbnail {
    background: white;
    border: 1px solid #ddd;
    /* Visible border */
    border-radius: 8px;
    padding: 15px;
    cursor: pointer;
    height: 140px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    transition: all 0.2s;
}

.slide-thumbnail:hover {
    border-color: var(--color-accent);
    transform: translateY(-3px);
}

.thumb-title {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.3;
}

.thumb-number {
    margin-top: 10px;
    font-size: 0.8rem;
    color: var(--color-accent);
}

/* Mobile */
@media (max-width: 768px) {

    .tile-grid,
    .four-block-layout,
    .comparison-layout {
        grid-template-columns: 1fr;
    }

    h1 {
        font-size: 3em;
    }

    h2 {
        font-size: 2.2em;
    }

    .slide::before {
        display: none;
    }

    /* Clean up mobile bg */

    .controls-center {
        width: 100%;
        justify-content: space-between;
        padding: 0 20px;
    }
}