/* ================= DESIGN SYSTEM & VARIABLES ================= */
:root {
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    
    /* Layout */
    --header-height: 64px;
    --border-radius-sm: 6px;
    --border-radius-md: 10px;
    --border-radius-lg: 14px;
}

body.light-theme {
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    
    --accent: #0066cc;
    --accent-hover: #0052a3;
    --accent-light: rgba(0, 102, 204, 0.08);
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.02);
    --shadow-md: 0 4px 12px 0 rgba(0, 0, 0, 0.04), 0 1px 3px 0 rgba(0, 0, 0, 0.02);
    --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.03);
    
    --header-bg-rgb: 248, 249, 250;
    --spinner-border: #e2e8f0;
}

body.dark-theme {
    --bg-primary: #0d0d0f;
    --bg-secondary: #16161a;
    --bg-tertiary: #202025;
    --border-color: #26262c;
    --border-hover: #32323a;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --accent: #0066cc;
    --accent-hover: #1d4ed8;
    --accent-light: rgba(0, 102, 204, 0.15);
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px 0 rgba(0, 0, 0, 0.25), 0 1px 4px 0 rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 12px 30px -5px rgba(0, 0, 0, 0.4), 0 10px 12px -6px rgba(0, 0, 0, 0.3);
    
    --header-bg-rgb: 13, 13, 15;
    --spinner-border: #26262c;
}

/* ================= BASIC RESET & LAYOUT ================= */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* ================= HEADER ================= */
.app-header {
    height: var(--header-height);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 32px;
    border-bottom: 1px solid var(--border-color);
    background-color: rgba(var(--header-bg-rgb), 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    transition: border-color var(--transition-normal);
}

.header-logo {
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.025em;
    cursor: pointer;
    user-select: none;
    outline: none;
    transition: transform var(--transition-fast);
}

.header-logo:hover {
    transform: scale(1.02);
}

.header-logo:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 4px;
}

.logo-accent {
    color: var(--accent);
}

.theme-toggle-btn {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-primary);
    outline: none;
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.theme-toggle-btn:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--border-hover);
}

.theme-toggle-btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Sun/Moon icons toggle */
body.light-theme .theme-toggle-btn .sun-icon { display: block; }
body.light-theme .theme-toggle-btn .moon-icon { display: none; }
body.dark-theme .theme-toggle-btn .sun-icon { display: none; }
body.dark-theme .theme-toggle-btn .moon-icon { display: block; }

/* ================= MAIN CONTAINER ================= */
.main-container {
    margin-top: var(--header-height);
    min-height: calc(100% - var(--header-height));
    padding: 64px 32px 32px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* ================= VIEW PANELS (SPA) ================= */
.view-panel {
    display: none;
    width: 100%;
    max-width: 960px;
    opacity: 0;
    transform: translateY(12px) scale(0.99);
    transition: opacity var(--transition-normal) ease-out, 
                transform var(--transition-normal) ease-out;
}

.view-panel.active {
    display: block;
    opacity: 1;
    transform: translateY(0) scale(1);
}

/* ================= HERO SECTION ================= */
.hero-section {
    text-align: center;
    margin-bottom: 48px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    margin-bottom: 12px;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* ================= CARDS GRID ================= */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    width: 100%;
}

.tool-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 32px 24px;
    cursor: pointer;
    transition: transform var(--transition-normal) cubic-bezier(0.16, 1, 0.3, 1), 
                box-shadow var(--transition-normal), 
                border-color var(--transition-normal);
    box-shadow: var(--shadow-sm);
    outline: none;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.tool-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent);
}

.tool-card:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 4px;
}

.card-icon {
    color: var(--accent);
    background-color: var(--accent-light);
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.card-description {
    font-size: 0.925rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ================= COMPONENT: NAV & HEADERS ================= */
.back-nav {
    margin-bottom: 24px;
}

.back-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: var(--border-radius-sm);
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.back-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.tool-header {
    margin-bottom: 32px;
}

.tool-title {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 6px;
}

.tool-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
}

/* ================= COMPONENT: DRAG & DROP ================= */
.upload-zone {
    background-color: var(--bg-secondary);
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 64px 32px;
    text-align: center;
    cursor: pointer;
    position: relative;
    transition: border-color var(--transition-normal), 
                background-color var(--transition-normal), 
                box-shadow var(--transition-normal);
    outline: none;
}

.upload-zone:hover {
    border-color: var(--accent);
    background-color: var(--accent-light);
}

.upload-zone.dragging {
    border-color: var(--accent);
    background-color: var(--accent-light);
    box-shadow: 0 0 0 4px var(--accent-light);
}

.upload-zone.dragging .upload-icon {
    transform: scale(1.1);
}

.file-input {
    display: none;
}

.upload-state-content {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.upload-state-content.active {
    display: flex;
}

.upload-icon {
    color: var(--text-muted);
    margin-bottom: 16px;
    transition: transform var(--transition-fast);
}

.upload-title {
    font-size: 1.15rem;
    font-weight: 500;
    margin-bottom: 6px;
}

.upload-subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.kbd-badge {
    display: inline-block;
    padding: 2px 6px;
    font-size: 0.8em;
    font-family: 'JetBrains Mono', monospace, inherit;
    font-weight: 500;
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
    vertical-align: middle;
}

.upload-subtitle.error-msg {
    color: #ef4444;
}

.error-icon {
    font-size: 32px;
    margin-bottom: 16px;
}

/* Primary & Secondary Buttons */
.primary-btn {
    background-color: var(--accent);
    color: #ffffff;
    border: none;
    border-radius: var(--border-radius-sm);
    padding: 8px 18px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: background-color var(--transition-fast);
}

.primary-btn:hover {
    background-color: var(--accent-hover);
}

.secondary-btn {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 8px 18px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.secondary-btn:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--border-hover);
}

/* Loader Spinner */
.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--spinner-border);
    border-top: 3px solid var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 16px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ================= RESULT CONTAINERS ================= */
.result-container {
    display: none; /* Show dynamically */
    width: 100%;
}

.result-container.active {
    display: block;
}

.result-actions {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    align-items: center;
}

.result-actions.flex-end {
    justify-content: flex-end;
}

/* For links disguised as buttons */
a.primary-btn, a.secondary-btn {
    text-decoration: none;
}

/* ================= TOOL 1: PDF PREVIEW ================= */
.pdf-preview-box {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    width: 100%;
    height: 600px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.pdf-preview-box iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* ================= TOOL 2: DOCUMENT -> MD ================= */
.markdown-editor-box {
    width: 100%;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    background-color: var(--bg-secondary);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.markdown-editor-box textarea {
    width: 100%;
    height: 500px;
    padding: 24px;
    font-family: 'JetBrains Mono', ui-monospace, monospace;
    font-size: 0.95rem;
    color: var(--text-primary);
    background-color: transparent;
    border: none;
    resize: none;
    outline: none;
    line-height: 1.6;
}

/* ================= TOOL 3: READER VIEW ================= */
.reader-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 10px 16px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}

.toolbar-left, .toolbar-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.toolbar-separator {
    width: 1px;
    height: 20px;
    background-color: var(--border-color);
    margin: 0 4px;
}

.toolbar-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px 12px;
    border-radius: var(--border-radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.toolbar-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

/* For labels that work as file inputs */
label.toolbar-btn {
    position: relative;
    display: inline-flex;
    margin-bottom: 0;
}

.hidden-file-input {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Reading Canvas */
.reader-canvas-wrapper {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 48px 64px;
    width: 100%;
    min-height: 500px;
}

.reader-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 64px 0;
    color: var(--text-muted);
    text-align: center;
}

.placeholder-icon {
    margin-bottom: 16px;
}

.reader-placeholder h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.reader-placeholder p {
    font-size: 0.9rem;
}

/* ================= TYPOGRAPHY (MARKDOWN RENDERING) ================= */
.markdown-body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-primary);
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
    margin-top: 1.6em;
    margin-bottom: 0.6em;
    font-weight: 700;
    line-height: 1.35;
    letter-spacing: -0.02em;
}

.markdown-body h1 { font-size: 2.2rem; border-bottom: 1px solid var(--border-color); padding-bottom: 0.3em; margin-top: 0; }
.markdown-body h2 { font-size: 1.6rem; border-bottom: 1px solid var(--border-color); padding-bottom: 0.3em; }
.markdown-body h3 { font-size: 1.3rem; }
.markdown-body h4 { font-size: 1.1rem; }

.markdown-body p {
    margin-top: 0;
    margin-bottom: 1.2em;
}

.markdown-body a {
    color: var(--accent);
    text-decoration: none;
}

.markdown-body a:hover {
    text-decoration: underline;
}

.markdown-body strong {
    font-weight: 600;
}

.markdown-body ul,
.markdown-body ol {
    margin-top: 0;
    margin-bottom: 1.2em;
    padding-left: 1.75em;
}

.markdown-body li {
    margin-bottom: 0.3em;
}

.markdown-body blockquote {
    border-left: 4px solid var(--accent);
    background-color: var(--bg-tertiary);
    padding: 12px 20px;
    margin: 0 0 1.2em 0;
    border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
    color: var(--text-secondary);
}

.markdown-body blockquote p:last-child {
    margin-bottom: 0;
}

.markdown-body table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.2em;
}

.markdown-body th,
.markdown-body td {
    border: 1px solid var(--border-color);
    padding: 10px 14px;
}

.markdown-body th {
    background-color: var(--bg-tertiary);
    font-weight: 600;
    text-align: left;
}

.markdown-body tr:nth-child(even) td {
    background-color: var(--bg-primary);
}

.markdown-body hr {
    border: 0;
    border-top: 1px solid var(--border-color);
    margin: 32px 0;
}

/* Inline Code styling */
.markdown-body code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85em;
    background-color: var(--bg-tertiary);
    padding: 3px 6px;
    border-radius: 4px;
    color: var(--text-primary);
}

/* Monospace pre code block */
.markdown-body pre {
    margin-top: 0;
    margin-bottom: 1.2em;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 16px;
    overflow: auto;
    position: relative;
}

.markdown-body pre code {
    background-color: transparent;
    padding: 0;
    border-radius: 0;
    font-size: 0.9rem;
    line-height: 1.5;
    color: inherit;
    display: block;
}

/* Code block header label and copy buttons */
.code-block-wrapper {
    position: relative;
    margin-bottom: 1.2em;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    background-color: var(--bg-primary);
    overflow: hidden;
}

.code-block-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 16px;
    background-color: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    font-size: 0.8rem;
    font-family: 'Inter', sans-serif;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-weight: 600;
}

.code-block-wrapper pre {
    border: none;
    border-radius: 0;
    margin: 0;
}

.code-copy-btn {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 4px 8px;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.75rem;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.code-copy-btn:hover {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

/* ================= SPLIT EDITOR LAYOUT ================= */
.editor-split-container {
    display: none; /* Shown dynamically in edit mode */
    grid-template-columns: 1fr 1fr;
    gap: 0;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    background-color: var(--bg-secondary);
    height: calc(100vh - 220px);
    min-height: 500px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.editor-split-container.active {
    display: grid;
}

.editor-pane {
    border-right: 1px solid var(--border-color);
    height: 100%;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.preview-pane {
    height: 100%;
    overflow-y: auto;
    padding: 32px 40px;
    background-color: var(--bg-secondary);
}

/* CodeMirror 6 custom styling overrides */
.cm-editor {
    height: 100%;
    font-family: 'JetBrains Mono', monospace !important;
    font-size: 0.95rem;
}

.cm-scroller {
    overflow: auto;
}

/* Editor Control Toolbar */
.editor-toolbar {
    display: none;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 16px;
}

.editor-toolbar.active {
    display: flex;
}

/* ================= RESPONSIVE LAYOUTS ================= */
@media (max-width: 900px) {
    .cards-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .hero-title {
        font-size: 2.75rem;
    }
    
    .main-container {
        padding: 48px 16px 24px 16px;
    }
    
    .reader-canvas-wrapper {
        padding: 32px 24px;
    }
    
    .editor-split-container.active {
        grid-template-columns: 1fr;
        grid-template-rows: 1fr 1fr;
        height: auto;
    }
    
    .editor-pane {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        height: 400px;
    }
    
    .preview-pane {
        height: 400px;
        padding: 24px;
    }
}

@media (max-width: 576px) {
    .app-header {
        padding: 0 16px;
    }
    
    .hero-title {
        font-size: 2.25rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .tool-title {
        font-size: 1.75rem;
    }
    
    .reader-toolbar {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }
    
    .toolbar-left, .toolbar-right {
        justify-content: space-between;
    }
    
    .toolbar-separator {
        display: none;
    }
}

/* ================= MODE SWITCHER & BULK RESULT CARD ================= */
.mode-switcher {
    display: flex;
    justify-content: center;
    background-color: var(--bg-tertiary);
    padding: 4px;
    border-radius: var(--border-radius-md);
    margin-bottom: 24px;
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
}

.mode-btn {
    background: none;
    border: none;
    padding: 8px 16px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--border-radius-sm);
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.mode-btn.active {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

.bulk-result-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 48px 32px;
    text-align: center;
    margin-top: 16px;
    box-shadow: var(--shadow-sm);
}

.bulk-success-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.bulk-result-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.bulk-result-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 0;
}

/* ================= FLOATING INFO BUTTON & MODAL ================= */
.info-btn {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
    z-index: 1000;
}

.info-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    transform: scale(1.05);
}

.info-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-medium);
    z-index: 2000;
}

.info-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.info-modal {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    width: 90%;
    max-width: 440px;
    padding: 32px;
    box-shadow: var(--shadow-lg);
    position: relative;
    transform: translateY(20px);
    transition: transform var(--transition-medium);
}

.info-overlay.active .info-modal {
    transform: translateY(0);
}

.info-close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: var(--border-radius-sm);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.info-close-btn:hover {
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
}

.info-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    margin-top: 0;
}

.info-content {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.info-content p {
    margin-top: 0;
    margin-bottom: 16px;
}

.info-content ul {
    margin: 0 0 20px 0;
    padding-left: 20px;
}

.info-content li {
    margin-bottom: 8px;
}

.info-separator {
    border: 0;
    border-top: 1px solid var(--border-color);
    margin: 20px 0;
}

.info-credit {
    font-size: 0.9rem;
    text-align: center;
    margin-bottom: 8px;
}

.info-links {
    display: flex;
    justify-content: center;
    margin: 0;
}

.info-github-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

.info-github-link:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* ================= DOCUMENT TO MARKDOWN + IMAGES ================= */
.upload-state-content.state-selected {
    display: none;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    padding: 24px;
    animation: fadeIn var(--transition-normal);
}

.upload-state-content.state-selected.active {
    display: flex;
}

.selected-file-icon {
    font-size: 3rem;
    margin-bottom: 12px;
    animation: bounce 2s infinite;
}

.export-options {
    width: 100%;
    margin: 20px 0;
    text-align: left;
}

.options-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    font-size: 1rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.option-group {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.option-label {
    display: flex;
    align-items: flex-start;
    padding: 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-md);
    background-color: var(--bg-secondary);
    cursor: pointer;
    transition: border-color var(--transition-fast), background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
    position: relative;
}

.option-label:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Radio Input Hiding */
.option-label input[type="radio"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

/* Custom Radio Indicator */
.custom-radio {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    margin-right: 16px;
    margin-top: 2px;
    flex-shrink: 0;
    position: relative;
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.option-label:hover .custom-radio {
    border-color: var(--text-secondary);
}

.option-label input[type="radio"]:checked ~ .custom-radio {
    border-color: var(--accent);
    background-color: var(--accent);
}

.option-label input[type="radio"]:checked ~ .custom-radio::after {
    content: "";
    position: absolute;
    top: 5px;
    left: 5px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #ffffff;
}

/* Style parent option-label based on checked radio */
.option-label:has(input[type="radio"]:checked) {
    border-color: var(--accent);
    background-color: var(--accent-light);
}

.option-text {
    display: flex;
    flex-direction: column;
}

.option-text strong {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.option-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

.action-row {
    display: flex;
    gap: 12px;
    justify-content: center;
    width: 100%;
    margin-top: 16px;
}

/* Bounce & Fade In Keyframes */
@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ================= PRINT STYLE SHEET ================= */
@media print {
    html, body {
        background-color: #ffffff !important;
        color: #000000 !important;
    }
    
    .app-header, 
    .back-nav, 
    .tool-header, 
    .upload-zone, 
    .result-actions,
    .reader-toolbar, 
    .editor-toolbar,
    .editor-split-container,
    .info-btn,
    .info-overlay {
        display: none !important;
    }
    
    .main-container {
        margin-top: 0 !important;
        padding: 0 !important;
        min-height: 0 !important;
    }
    
    .reader-canvas-wrapper {
        border: none !important;
        box-shadow: none !important;
        padding: 0 !important;
        background: none !important;
    }
    
    .markdown-body {
        font-size: 11pt !important;
        line-height: 1.6 !important;
    }
}