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

body {
    font-family: Arial, sans-serif;
    background-color: #e8eaf0;
}

/* ── Upload UI (mirrors main app) ─────────────────────────── */
#file-upload-container {
    width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: #5368e4;
    gap: 2rem;
}

#header h1 {
    color: white;
    font-size: 3rem;
    text-align: center;
}

#upload-box {
    background-color: white;
    padding: 3rem;
    border-radius: 1rem;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

#upload-box h1 {
    color: #5368e4;
    margin-bottom: 1rem;
    font-size: 2.5rem;
}

#upload-box p {
    color: #666;
    margin-bottom: 2rem;
    font-size: 1.2rem;
}

#file-input {
    font-size: 1.1rem;
    padding: 0.5rem;
    cursor: pointer;
}

.nav-buttons {
    margin-top: 2rem;
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.nav-btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: #5368e4;
    color: white;
    text-decoration: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: background-color 0.2s, transform 0.1s;
}

.nav-btn:hover {
    background-color: #3f51d4;
    transform: translateY(-2px);
}

/* ── Print controls bar ───────────────────────────────────── */
#print-bar {
    display: none;
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: #3a3a3a;
    color: white;
    padding: 0.75rem 2rem;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    box-shadow: 0 2px 6px rgba(0,0,0,0.3);
}

#print-bar span {
    font-size: 1rem;
    opacity: 0.85;
}

#print-bar-actions {
    display: flex;
    align-items: center;
    gap: 1.2rem;
    flex-shrink: 0;
}

#print-btn {
    padding: 0.55rem 1.4rem;
    background-color: #5368e4;
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

#print-btn:hover {
    background-color: #3f51d4;
}

/* ── Color-print toggle ───────────────────────────────────── */
.color-toggle {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    cursor: pointer;
    user-select: none;
    color: white;
}

/* hide the real checkbox */
.color-toggle input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-track {
    position: relative;
    width: 3rem;
    height: 1.6rem;
    background-color: #666;
    border-radius: 1rem;
    transition: background-color 0.2s;
    flex-shrink: 0;
}

.color-toggle input:checked + .toggle-track {
    background-color: #5368e4;
}

.toggle-thumb {
    position: absolute;
    top: 0.2rem;
    left: 0.2rem;
    width: 1.2rem;
    height: 1.2rem;
    background-color: white;
    border-radius: 50%;
    transition: transform 0.2s;
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

.color-toggle input:checked + .toggle-track .toggle-thumb {
    transform: translateX(1.4rem);
}

.toggle-label {
    font-size: 0.95rem;
    white-space: nowrap;
}

/* ── Slides wrapper ───────────────────────────────────────── */
#slides-container {
    display: none;
    flex-direction: column;
    align-items: center;
    padding: 2rem;
    gap: 2rem;
    /* extra bottom padding so last slide isn't flush to edge */
    padding-bottom: 4rem;
}

/* ── Individual slide ─────────────────────────────────────── */
/*
 * A4 landscape: 297mm × 210mm.
 * On screen we render at a comfortable preview scale.
 * The actual mm dimensions are enforced in @media print.
 */
.slide {
    /* screen dimensions: 297mm × 210mm at 96 dpi ≈ 1122px × 794px */
    width: 1122px;
    height: 794px;
    background-color: #5368e4; /* default; overridden by JS */
    color: white;              /* default; overridden by JS */
    border-radius: 0.5rem;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 5%;
    overflow: hidden;
    position: relative;
}

/* Slide number badge */
.slide-number {
    position: absolute;
    bottom: 1rem;
    right: 1.5rem;
    font-size: 0.85rem;
    opacity: 0.45;
}

/* ── Slide content ────────────────────────────────────────── */
.slide-inner {
    text-align: center;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5em;
    /* font-size is set per-slide by JS auto-sizer */
}

.slide-title {
    font-size: 1.25em;
    font-weight: bold;
    text-transform: uppercase;
    margin-bottom: 0.4em;
    line-height: 1.2;
}

.slide-text {
    font-size: 1em;
    line-height: 1.5;
}

.slide-inner ul {
    list-style-type: disc;
    text-align: left;
    display: inline-block;
}

.slide-inner li {
    margin: 0.4em 0;
}

/* ── Print styles ─────────────────────────────────────────── */
@media print {
    @page {
        size: A4 landscape;
        margin: 0;
    }

    body {
        background: none;
    }

    #file-upload-container,
    #print-bar {
        display: none !important;
    }

    #slides-container {
        display: flex !important;
        padding: 0;
        gap: 0;
        align-items: stretch;
    }

    .slide {
        /* exact A4 landscape */
        width: 297mm;
        height: 210mm;
        box-shadow: none;
        border-radius: 0;
        page-break-after: always;
        break-after: page;
        /* keep flex centering */
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
    }

    .slide:last-child {
        page-break-after: avoid;
        break-after: avoid;
    }

    .slide-number {
        display: none;
    }

    /* B&W mode (default): ensure white background and black text */
    body:not(.print-color) .slide {
        background-color: white !important;
        color: black !important;
    }

    /* Color mode: tell the browser to print backgrounds as-is */
    body.print-color .slide {
        print-color-adjust: exact;
        -webkit-print-color-adjust: exact;
    }
}