:root {
    --bg: #faf7f2; /* Warm sand background */
    --sidebar-bg: #ffffff;
    --surface: #ffffff;
    --border: #ebdcd0;
    --border-bright: #d4bfb0;
    --text: #2c1d11; /* Deep coffee brown text */
    --text-dim: #7d6b5e;
    --accent: #b05c2e; /* Terracotta / Copper */
    --accent-dim: rgba(176, 92, 46, 0.08);
    --green: #2c6b45; /* Emerald/Olive green */
    --green-dim: rgba(44, 107, 69, 0.08);
    --gold: #b38600;
    --gold-dim: rgba(179, 134, 0, 0.08);
    --red: #b03a2e;
    --red-dim: rgba(176, 58, 46, 0.08);
    --glass-blur: blur(0px);
    
    --font-serif: 'Playfair Display', Georgia, serif;
    --font-sans: 'Plus Jakarta Sans', system-ui, sans-serif;
}

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

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    overflow: hidden;
    height: 100vh;
}

/* PRESENTATION TOP BAR */
.presentation-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
    z-index: 100;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-content h1 {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--accent);
}

.logo-content p {
    font-size: 0.65rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-buttons {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.slide-link {
    font-size: 0.75rem;
    color: var(--text-dim);
    text-decoration: none;
    padding: 0.4rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 0.35rem;
    background: rgba(255, 255, 255, 0.5);
    transition: all 0.25s;
    font-weight: 600;
}

.slide-link:hover {
    color: var(--text);
    border-color: var(--border-bright);
    background: rgba(176, 92, 46, 0.04);
}

.fullscreen-btn {
    background: transparent;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    padding: 0.4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s;
}

.fullscreen-btn:hover {
    color: var(--text);
}

/* DECK SCROLL CONTAINER */
.deck {
    height: 100vh;
    overflow-y: scroll;
    scroll-snap-type: y mandatory;
    scroll-behavior: smooth;
}

.slide {
    height: 100vh;
    scroll-snap-align: start;
    scroll-snap-stop: always;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    padding: 80px 2rem 2rem 2rem;
    background-color: var(--bg);
    overflow: hidden;
}

.slide__container {
    max-width: 1000px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 10;
}

/* Slide elements */
.slide-badge {
    align-self: center;
    background: var(--accent-dim);
    color: var(--accent);
    border: 1px solid rgba(176, 92, 46, 0.2);
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1.5rem;
}

.slide__display {
    font-family: var(--font-serif);
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1.15;
    margin-bottom: 1.5rem;
}

.slide__heading {
    font-family: var(--font-serif);
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 1.5rem;
}

.slide__label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 0.5rem;
}

.slide__body {
    font-size: 1.15rem;
    color: var(--text-dim);
    max-width: 650px;
    margin: 0 auto;
    line-height: 1.6;
}

.slide__inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    align-items: center;
}

.slide__bullets {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.slide__bullets li {
    font-size: 1rem;
    position: relative;
    padding-left: 24px;
    color: var(--text);
}

.slide__bullets li::before {
    content: '☕';
    position: absolute;
    left: 0;
    top: 2px;
    font-size: 0.85rem;
}

/* Layout helpers */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.glass-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1.75rem;
    box-shadow: 0 10px 30px rgba(44, 29, 17, 0.02);
    position: relative;
    transition: all 0.3s ease;
}

.card-num-badge {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 1.75rem;
    color: var(--accent-dim);
    font-weight: bold;
}

.glass-card h3 {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text);
}

/* Tables */
.slide-table-card {
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    overflow: hidden;
    background: #ffffff;
    box-shadow: 0 10px 30px rgba(44, 29, 17, 0.02);
}

.slide-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
}

.slide-table th {
    background: rgba(176, 92, 46, 0.02);
    color: var(--text-dim);
    padding: 1rem 1.25rem;
    font-weight: 700;
    border-bottom: 1px solid var(--border);
    text-align: left;
}

.slide-table td {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border);
    color: var(--text);
}

.slide-table tr:last-child td {
    border-bottom: none;
}

/* Horizontal Flow Layout */
.slide-horizontal-flow {
    display: flex;
    justify-content: space-between;
    align-items: stretch;
    gap: 1rem;
    margin-top: 1rem;
}

.flow-step {
    flex: 1;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    position: relative;
    box-shadow: 0 4px 12px rgba(44, 29, 17, 0.01);
}

.flow-step-num {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-style: italic;
    color: var(--accent);
    font-weight: 700;
    line-height: 1;
}

.flow-step h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text);
}

.flow-step p {
    font-size: 0.75rem;
    color: var(--text-dim);
    line-height: 1.4;
}

/* Timeline */
.slide-timeline {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 0.5rem;
}

.slide-timeline-item {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.timeline-phase {
    min-width: 150px;
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--accent);
    text-align: right;
}

.timeline-card {
    flex: 1;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 12px rgba(44, 29, 17, 0.01);
}

.timeline-card p {
    font-size: 0.85rem;
    color: var(--text);
}

.timeline-card .badge {
    font-size: 0.65rem;
    font-weight: 700;
    background: var(--accent-dim);
    color: var(--accent);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    text-transform: uppercase;
}

/* Footer indicators */
.slide-footer {
    position: absolute;
    bottom: 2rem;
    left: 2rem;
    right: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    color: var(--text-dim);
    z-index: 10;
}

.slide-number {
    font-family: var(--font-mono);
}

/* RESPONSIVE STYLES FOR MOBILE PRESENTATIONS */
@media (max-width: 768px) {
    body {
        overflow: auto;
        height: auto;
    }

    .presentation-bar {
        position: static;
        height: auto;
        padding: 0.75rem 1rem;
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .nav-buttons {
        flex-wrap: wrap;
        width: 100%;
        gap: 0.35rem;
    }

    .slide-link {
        flex-grow: 1;
        text-align: center;
        padding: 0.4rem 0.5rem;
        font-size: 0.7rem;
    }

    .deck {
        height: auto;
        overflow: visible;
        scroll-snap-type: none;
    }

    .slide {
        height: auto;
        min-height: calc(100vh - 80px);
        scroll-snap-align: none;
        padding: 2rem 1rem 4rem 1rem;
    }

    .slide__container {
        max-width: 100%;
    }

    .slide__display {
        font-size: 2.2rem;
        margin-bottom: 1rem;
    }

    .slide__heading {
        font-size: 1.5rem;
        margin-bottom: 1rem;
    }

    .slide__body {
        font-size: 0.95rem;
        line-height: 1.5;
    }

    .slide__inner {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

    .glass-card {
        padding: 1.25rem 1rem;
    }

    .card-num-badge {
        top: 1rem;
        right: 1rem;
        font-size: 1.35rem;
    }

    .slide-table-card {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .slide-table {
        min-width: 500px; /* triggers horizontal scroll for wide tables */
        font-size: 0.8rem;
    }

    .slide-table th, .slide-table td {
        padding: 0.75rem 0.85rem;
    }

    .slide-horizontal-flow {
        flex-direction: column;
        gap: 0.75rem;
    }

    .flow-step {
        padding: 1rem;
    }

    .slide-timeline-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .timeline-phase {
        text-align: left;
        min-width: auto;
        font-size: 1rem;
    }

    .timeline-card {
        width: 100%;
        padding: 0.85rem 1rem;
        flex-direction: column;
        align-items: flex-start;
        gap: 0.35rem;
    }

    .slide-footer {
        position: static;
        margin-top: 2rem;
        padding: 1rem 0 0 0;
        border-top: 1px solid var(--border);
        width: 100%;
    }
}