/* ══════════════════════════════════════════════════════════════════════════════
   Chahua Video Builder - Main Stylesheet
   Professional Edition - Clean and Modern Design
   ══════════════════════════════════════════════════════════════════════════════
   Company: Chahua Development Co., Ltd.
   Version: 1.0.0
   License: MIT
   ══════════════════════════════════════════════════════════════════════════════ */

/* ════════════════════════════════════════════════════════════════════════════
   CSS Variables (Design Tokens)
   ════════════════════════════════════════════════════════════════════════════ */

:root {
    /* Primary Colors - Dark Blue Theme */
    --accent-color: #3b82f6;
    --color-primary: #3b82f6;
    --color-secondary: #06b6d4;
    
    /* Background Colors */
    --color-background: #0a1628;
    --color-surface: #132337;
    --color-surface-hover: #1a2f47;
    --color-border: #1e3a5f;
    
    /* Text Colors */
    --color-text: #e2e8f0;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;
    
    /* Accent Colors */
    --color-cyan: #06b6d4;
    --color-blue: #3b82f6;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    
    /* Fonts */
    --font-primary: 'Inter', sans-serif;
    --font-code: 'Source Code Pro', monospace;
    
    /* Layout */
    --border-radius: 0.75rem;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
    --content-spacing: 1.5rem;
    
    /* UI Elements (will be overridden by presentation-config.js) */
    --preview-opacity: 0.68;
    --overlay-background: rgba(10, 22, 40, 0.85);
    --overlay-blur: 8px;
    
    /* Page Indicator (will be overridden by presentation-config.js) */
    --page-indicator-top: 16px;
    --page-indicator-right: 16px;
    --page-indicator-font-size: 0.875rem;
    --page-indicator-opacity: 0.7;
    --page-indicator-padding-x: 12px;
    --page-indicator-padding-y: 4px;
    --page-indicator-bg-color: rgba(22, 78, 99, 0.5);
    --page-indicator-text-color: #a5f3fc;
    --nav-border-width: 2px;
    --nav-border-opacity: 0.5;
    
    /* Borders & Accents */
    --heading-accent-border-width: 4px;
    --blockquote-border-width: 4px;
    --image-border-width: 2px;
    --link-underline-width: 2px;
    --table-border-width: 1px;
    --hr-border-width: 2px;
    
    /* Effects */
    --backdrop-gradient-color: rgba(59, 130, 246, 0.15);
    --backdrop-gradient-spread: 70%;
    --backdrop-blur: 60px;
}

/* ════════════════════════════════════════════════════════════════════════════
   Base Styles
   ════════════════════════════════════════════════════════════════════════════ */

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

body {
    font-family: var(--font-primary);
    background-color: var(--color-background);
    color: var(--color-text);
    overflow-x: hidden;
}

/* ════════════════════════════════════════════════════════════════════════════
   Video Stage Components
   ════════════════════════════════════════════════════════════════════════════ */

.stage-frame {
    position: relative;
    width: 100%;
    padding-top: 56.25%; /* 16:9 aspect ratio */
    border-radius: var(--border-radius);
    overflow: hidden;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
}

#stage {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-surface);
    overflow: hidden;
}

/* ════════════════════════════════════════════════════════════════════════════
   Smart Layout Enhancements
   ════════════════════════════════════════════════════════════════════════════ */

.smart-layout-root .smart-list {
    list-style: none;
    padding: 0;
    margin: 0 0 var(--content-spacing);
    column-gap: 2.5rem;
}

.smart-layout-root .smart-list li {
    margin-left: 2rem;
    margin-bottom: 0.85rem;
    line-height: var(--line-height-body, 1.45);
}

.smart-layout-root .smart-list.smart-balanced,
.smart-layout-root .smart-list.smart-balanced-three {
    column-fill: balance;
}

.smart-layout-root .smart-list.smart-balanced {
    column-count: 2;
}

.smart-layout-root .smart-list.smart-balanced-three {
    column-count: 3;
}

.smart-layout-root .smart-list.smart-balanced li,
.smart-layout-root .smart-list.smart-balanced-three li {
    break-inside: avoid;
    margin-left: 1.25rem !important;
}

.smart-layout-root .smart-list.has-preview li[data-preview="true"] {
    opacity: var(--preview-opacity);
}

/* ════════════════════════════════════════════════════════════════════════════
   Pause Overlay
   ════════════════════════════════════════════════════════════════════════════ */

.pause-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--overlay-background, rgba(10, 22, 40, 0.85));
    backdrop-filter: blur(var(--overlay-blur, 8px));
    z-index: 1000;
    transition: opacity 0.3s ease;
}

.pause-overlay.hidden {
    display: none;
}

.pause-indicator {
    text-align: center;
    animation: pulse-pause 2s ease-in-out infinite;
}

.pause-icon {
    font-size: 6rem;
    margin-bottom: 1rem;
    filter: drop-shadow(0 4px 12px rgba(59, 130, 246, 0.5));
}

.pause-text {
    font-size: 2rem;
    font-weight: bold;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.2em;
    margin-bottom: 0.5rem;
}

.pause-hint {
    font-size: 1rem;
    color: var(--color-text-secondary);
    opacity: 0.8;
}

@keyframes pulse-pause {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.7;
        transform: scale(1.05);
    }
}

/* ════════════════════════════════════════════════════════════════════════════
   Navigation Controls (Presentation Mode)
   ════════════════════════════════════════════════════════════════════════════ */

.nav-controls {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 1rem;
    z-index: 900;
    transition: opacity 0.3s ease;
}

.nav-controls.hidden {
    display: none;
}

.nav-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    background: var(--color-surface, rgba(19, 35, 55, 0.9));
    border: var(--nav-border-width, 2px) solid rgba(59, 130, 246, var(--nav-border-opacity, 0.5));
    border-radius: 50%;
    color: var(--color-primary);
    cursor: pointer;
    transition: all 0.2s ease;
    backdrop-filter: blur(10px);
}

.nav-btn:hover:not(:disabled) {
    background: rgba(59, 130, 246, 0.2);
    border-color: var(--color-primary);
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.nav-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    border-color: rgba(100, 116, 139, 0.3);
}

.nav-arrow {
    font-size: 1.5rem;
    font-weight: bold;
}

.slide-counter {
    padding: 0.5rem 1rem;
    background: rgba(19, 35, 55, 0.9);
    border: 2px solid rgba(59, 130, 246, 0.5);
    border-radius: var(--border-radius);
    color: var(--color-text);
    font-size: 0.875rem;
    font-weight: 600;
    backdrop-filter: blur(10px);
    min-width: 5rem;
    text-align: center;
}

/* ════════════════════════════════════════════════════════════════════════════
   Fullscreen Button
   ════════════════════════════════════════════════════════════════════════════ */

.fullscreen-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    background: rgba(19, 35, 55, 0.9);
    border: 2px solid rgba(59, 130, 246, 0.5);
    border-radius: 0.5rem;
    color: var(--color-primary);
    cursor: pointer;
    transition: all 0.2s ease;
    backdrop-filter: blur(10px);
    z-index: 900;
}

.fullscreen-btn:hover {
    background: rgba(59, 130, 246, 0.2);
    border-color: var(--color-primary);
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.fullscreen-btn.hidden {
    display: none;
}

.fullscreen-icon {
    font-size: 1.25rem;
}

/* Exit Presentation Mode Button */
.exit-presentation-btn {
    position: absolute;
    top: 1rem;
    right: 7.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    background: rgba(239, 68, 68, 0.9);
    border: 2px solid rgba(248, 113, 113, 0.5);
    border-radius: 0.5rem;
    color: white;
    cursor: pointer;
    transition: all 0.2s ease;
    backdrop-filter: blur(10px);
    z-index: 900;
}

.exit-presentation-btn:hover {
    background: rgba(239, 68, 68, 1);
    border-color: rgba(248, 113, 113, 0.8);
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.5);
}

.exit-presentation-btn.hidden {
    display: none;
}

.exit-presentation-btn svg {
    display: block;
}

/* Stop Preview Button */
.stop-preview-btn,
.stop-export-btn {
    position: absolute;
    top: 1rem;
    right: 11rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    background: rgba(251, 191, 36, 0.9);
    border: 2px solid rgba(252, 211, 77, 0.5);
    border-radius: 0.5rem;
    color: #1e293b;
    cursor: pointer;
    transition: all 0.2s ease;
    backdrop-filter: blur(10px);
    z-index: 900;
}

.stop-preview-btn:hover,
.stop-export-btn:hover {
    background: rgba(251, 191, 36, 1);
    border-color: rgba(252, 211, 77, 0.8);
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(251, 191, 36, 0.5);
}

.stop-preview-btn.hidden,
.stop-export-btn.hidden {
    display: none;
}

.stop-preview-btn svg,
.stop-export-btn svg {
    display: block;
}

/* ════════════════════════════════════════════════════════════════════════════
   Slide Edit Controls
   ════════════════════════════════════════════════════════════════════════════ */

/* Edit Slide Button (Pencil Icon) */
.edit-slide-btn {
    position: absolute;
    top: 1rem;
    right: 4.5rem;
    z-index: 900;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    background: rgba(59, 130, 246, 0.9);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(96, 165, 250, 0.5);
    border-radius: 0.5rem;
    color: white;
    cursor: pointer;
    transition: all 0.2s ease;
}

.edit-slide-btn:hover {
    background: rgba(59, 130, 246, 1);
    border-color: rgba(96, 165, 250, 0.8);
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.5);
}

.edit-slide-btn.active {
    background: rgba(16, 185, 129, 0.9);
    border-color: rgba(52, 211, 153, 0.5);
}

.edit-slide-btn.active:hover {
    background: rgba(16, 185, 129, 1);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.5);
}

.edit-slide-btn svg {
    display: block;
}

/* Save Slide Button */
.save-slide-btn {
    position: absolute;
    top: 1rem;
    right: 8rem;
    z-index: 900;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    background: rgba(16, 185, 129, 0.9);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(52, 211, 153, 0.5);
    border-radius: 0.5rem;
    color: white;
    cursor: pointer;
    transition: all 0.2s ease;
    animation: slideInRight 0.3s ease-out;
}

.save-slide-btn:hover {
    background: rgba(16, 185, 129, 1);
    border-color: rgba(52, 211, 153, 0.8);
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.5);
}

.save-slide-btn svg {
    display: block;
}

/* Cancel Edit Button */
.cancel-edit-btn {
    position: absolute;
    top: 1rem;
    right: 11.5rem;
    z-index: 900;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    background: rgba(239, 68, 68, 0.9);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(248, 113, 113, 0.5);
    border-radius: 0.5rem;
    color: white;
    cursor: pointer;
    transition: all 0.2s ease;
    animation: slideInRight 0.3s ease-out;
}

.cancel-edit-btn:hover {
    background: rgba(239, 68, 68, 1);
    border-color: rgba(248, 113, 113, 0.8);
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.5);
}

.cancel-edit-btn svg {
    display: block;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Editable Slide Content */
.slide-editable [contenteditable="true"] {
    outline: 2px dashed rgba(59, 130, 246, 0.5);
    outline-offset: 4px;
    border-radius: 0.375rem;
    padding: 0.5rem;
    min-height: 2rem;
    transition: all 0.2s ease;
    cursor: text;
}

.slide-editable [contenteditable="true"]:hover {
    outline-color: rgba(59, 130, 246, 0.8);
    background: rgba(59, 130, 246, 0.05);
}

.slide-editable [contenteditable="true"]:focus {
    outline: 2px solid rgba(59, 130, 246, 1);
    outline-offset: 4px;
    background: rgba(59, 130, 246, 0.1);
}

.slide-editable [contenteditable="true"]:empty:before {
    content: attr(data-placeholder);
    color: rgba(148, 163, 184, 0.5);
    font-style: italic;
}

/* Edit Mode Indicator */
.edit-mode-indicator {
    position: absolute;
    top: 1rem;
    left: 1rem;
    z-index: 900;
    background: rgba(59, 130, 246, 0.95);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(96, 165, 250, 0.5);
    border-radius: 0.5rem;
    padding: 0.5rem 1rem;
    color: white;
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.8;
    }
}

/* ═══════════════════════════════════════════════════════════════════════════
   DRAG & DROP SYSTEM STYLES
   ═══════════════════════════════════════════════════════════════════════════ */

/* Draggable content */
.draggable-content {
    cursor: move;
    position: absolute !important;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    transition: box-shadow 0.2s ease, transform 0.1s ease;
    pointer-events: auto;
}

.draggable-content:hover {
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.3);
}

.draggable-content.is-dragging {
    cursor: grabbing !important;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    transform: scale(1.02);
    z-index: 9999 !important;
    opacity: 0.9;
    user-select: none !important;
    -webkit-user-select: none !important;
    pointer-events: none;
}

/* ป้องกันการ select ทั้ง stage ขณะลาก */
.stage-dragging {
    user-select: none !important;
    -webkit-user-select: none !important;
    cursor: grabbing !important;
}

.stage-dragging * {
    pointer-events: none !important;
}

/* Drag handle */
.drag-handle {
    position: absolute;
    left: -30px;
    top: 50%;
    transform: translateY(-50%);
    width: 24px;
    height: 24px;
    background: rgba(59, 130, 246, 0.9);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: grab;
    opacity: 0;
    transition: opacity 0.2s ease, background 0.2s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.draggable-content:hover .drag-handle {
    opacity: 1;
}

.drag-handle:hover {
    background: rgba(59, 130, 246, 1);
}

.drag-handle:active {
    cursor: grabbing;
}

.drag-handle svg {
    color: white;
    fill: currentColor;
}

/* Position locked */
.position-locked {
    cursor: not-allowed !important;
}

.position-locked .drag-handle {
    background: rgba(156, 163, 175, 0.9);
    cursor: not-allowed;
}

.position-locked:hover {
    box-shadow: 0 0 0 2px rgba(156, 163, 175, 0.3);
}

/* Outside safe zone warning */
.outside-safe-zone {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.6) !important;
    animation: shake 0.3s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-4px); }
    75% { transform: translateX(4px); }
}

/* ═══════════════════════════════════════════════════════════════════════════
   SAFE ZONE OVERLAY STYLES - กรอบสีแดงบังคับ
   ═══════════════════════════════════════════════════════════════════════════ */

.safe-zone-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 8888;
    opacity: 1;
}

.safe-zone-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

/* Safe zone borders - กรอบสีแดงบาง */
.safe-zone-border {
    position: fixed;
    background: transparent;
    pointer-events: none;
}

.safe-zone-top,
.safe-zone-bottom {
    height: 1px;
    background: rgba(239, 68, 68, 0.8);
    box-shadow: 0 0 4px rgba(239, 68, 68, 0.5);
}

.safe-zone-left,
.safe-zone-right {
    width: 1px;
    background: rgba(239, 68, 68, 0.8);
    box-shadow: 0 0 4px rgba(239, 68, 68, 0.5);
}

/* เอฟเฟกต์เมื่อลากใกล้ขอบ */
.safe-zone-overlay.warning .safe-zone-border {
    background: rgba(239, 68, 68, 1);
    animation: pulse-red 0.5s ease infinite;
}

@keyframes pulse-red {
    0%, 100% {
        opacity: 1;
        filter: brightness(1);
    }
    50% {
        opacity: 0.7;
        filter: brightness(1.5);
    }
}

/* ═══════════════════════════════════════════════════════════════════════════
   POSITION CONTROLS UI
   ═══════════════════════════════════════════════════════════════════════════ */

.position-controls {
    position: fixed;
    bottom: 2rem;
    left: 2rem;
    background: rgba(17, 24, 39, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    padding: 1rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 9000;
    display: flex;
    gap: 0.5rem;
    transition: all 0.3s ease;
}

.position-controls.hidden {
    opacity: 0;
    pointer-events: none;
    transform: translateY(20px);
}

.position-control-btn {
    width: 40px;
    height: 40px;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 8px;
    color: rgba(59, 130, 246, 1);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    padding: 0;
}

.position-control-btn:hover {
    background: rgba(59, 130, 246, 0.2);
    border-color: rgba(59, 130, 246, 0.5);
    transform: translateY(-2px);
}

.position-control-btn:active {
    transform: translateY(0);
}

.position-control-btn.active {
    background: rgba(59, 130, 246, 0.3);
    border-color: rgba(59, 130, 246, 0.6);
}

.position-control-btn svg {
    width: 20px;
    height: 20px;
}

/* Position indicator */
.position-indicator {
    position: fixed;
    top: 1rem;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(17, 24, 39, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 8px;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    color: rgba(156, 163, 175, 1);
    font-family: 'Courier New', monospace;
    z-index: 9000;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.position-indicator.show {
    opacity: 1;
}

.fullscreen-btn.hidden,
.exit-presentation-btn.hidden,
.stop-preview-btn.hidden,
.stop-export-btn.hidden,
.edit-slide-btn.hidden,
.save-slide-btn.hidden,
.cancel-edit-btn.hidden {
    display: none;
}

/* Fullscreen mode adjustments */
.stage-frame:fullscreen {
    border-radius: 0;
    padding-top: 0;
}

.stage-frame:fullscreen #stage {
    width: 100vw;
    height: 100vh;
}

.stage-frame:-webkit-full-screen {
    border-radius: 0;
    padding-top: 0;
}

.stage-frame:-webkit-full-screen #stage {
    width: 100vw;
    height: 100vh;
}

.stage-frame:-moz-full-screen {
    border-radius: 0;
    padding-top: 0;
}

.stage-frame:-moz-full-screen #stage {
    width: 100vw;
    height: 100vh;
}

.stage-frame:-ms-fullscreen {
    border-radius: 0;
    padding-top: 0;
}

.stage-frame:-ms-fullscreen #stage {
    width: 100vw;
    height: 100vh;
}

/* ════════════════════════════════════════════════════════════════════════════
   Scene Styles
   ════════════════════════════════════════════════════════════════════════════ */

.scene {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 0;
    opacity: 0;
    transform: translateY(35px) scale(0.96);
    transition: opacity 0.6s ease, transform 0.6s ease;
    pointer-events: none;
    overflow: hidden;
    box-sizing: border-box;
    word-break: break-word;
    hyphens: auto;
}

.scene.active {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

.scene > * {
    max-width: 100%;
    word-wrap: break-word;
    overflow-wrap: break-word;
    word-break: break-word;
}

.scene .slide-content {
    max-height: 100%;
    max-width: 100%;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    text-align: var(--text-align, left);
    line-height: var(--line-height-body, 1.7);
}

#stage.screen-large .scene,
#stage.screen-ultra .scene {
    justify-content: flex-start;
    align-items: flex-start;
    padding: 0;
}

#stage.screen-ultra .scene {
    padding: 0;
}

#stage.screen-large [data-scene="body"] h1,
#smartMeasurementStage.screen-large [data-scene="body"] h1,
#stage.screen-ultra [data-scene="body"] h1,
#smartMeasurementStage.screen-ultra [data-scene="body"] h1 {
    font-size: var(--font-size-h1, clamp(2.5rem, 5vw, 4.5rem));
    max-width: 100%;
}

#stage.screen-large [data-scene="body"] h2,
#smartMeasurementStage.screen-large [data-scene="body"] h2,
#stage.screen-ultra [data-scene="body"] h2,
#smartMeasurementStage.screen-ultra [data-scene="body"] h2 {
    font-size: var(--font-size-h2, clamp(2rem, 4vw, 3.5rem));
    max-width: 100%;
}

#stage.screen-large [data-scene="body"] h3,
#smartMeasurementStage.screen-large [data-scene="body"] h3,
#stage.screen-ultra [data-scene="body"] h3,
#smartMeasurementStage.screen-ultra [data-scene="body"] h3 {
    font-size: var(--font-size-h3, clamp(1.75rem, 3vw, 2.75rem));
    max-width: 100%;
}

#stage.screen-large [data-scene="body"] p,
#smartMeasurementStage.screen-large [data-scene="body"] p,
#stage.screen-large [data-scene="body"] li,
#smartMeasurementStage.screen-large [data-scene="body"] li,
#stage.screen-ultra [data-scene="body"] p,
#smartMeasurementStage.screen-ultra [data-scene="body"] p,
#stage.screen-ultra [data-scene="body"] li,
#smartMeasurementStage.screen-ultra [data-scene="body"] li {
    font-size: var(--font-size-text, clamp(1.25rem, 2vw, 2rem));
    line-height: var(--line-height-body, 1.6);
    max-width: 100%;
}

#stage.screen-ultra [data-scene="body"] p,
#smartMeasurementStage.screen-ultra [data-scene="body"] p,
#stage.screen-ultra [data-scene="body"] li,
#smartMeasurementStage.screen-ultra [data-scene="body"] li {
    font-size: var(--font-size-text, clamp(1.5rem, 2.2vw, 2.2rem));
    max-width: 100%;
}

/* สำหรับหน้าจอใหญ่ ให้จัดเนื้อหาชิดซ้ายแทนกึ่งกลาง */
#stage.screen-large .smart-layout-root,
#stage.screen-ultra .smart-layout-root {
    align-items: flex-start;
}

#stage.screen-large .slide-heading,
#stage.screen-ultra .slide-heading {
    text-align: left;
    margin-left: 0;
    margin-right: 0;
    max-width: 95%;
}

#stage.screen-large .slide-text,
#stage.screen-ultra .slide-text {
    text-align: left;
    margin-left: 0;
    margin-right: 0;
    max-width: 92%;
}

#stage.screen-large .smart-list,
#stage.screen-ultra .smart-list {
    margin-left: 0;
    margin-right: 0;
    max-width: 92%;
}

#stage.screen-large .slide-blockquote,
#stage.screen-ultra .slide-blockquote {
    margin-left: 0;
    margin-right: 0;
    max-width: 90%;
}

#stage.screen-large .slide-code,
#stage.screen-ultra .slide-code {
    margin-left: 0;
    margin-right: 0;
    max-width: 95%;
}

#stage.screen-large .slide-image,
#stage.screen-ultra .slide-image {
    margin-left: 0;
    margin-right: auto;
    max-width: 85%;
}

[data-preview="true"],
.preview-block {
    opacity: var(--preview-opacity);
    border-top: 1px dashed rgba(96, 165, 250, 0.35);
    padding-top: calc(var(--content-spacing) * 1.1);
    margin-top: calc(var(--content-spacing) * 1.2);
}

.preview-block:first-child {
    border-top: none;
    padding-top: 0;
    margin-top: 0;
}

.preview-block hr,
hr.preview-block {
    border-color: rgba(96, 165, 250, 0.35);
}

.gradient-backdrop {
    position: absolute;
    inset: -20%;
    background: radial-gradient(
        circle at center, 
        var(--backdrop-gradient-color, rgba(59, 130, 246, 0.15)), 
        transparent var(--backdrop-gradient-spread, 70%)
    );
    filter: blur(var(--backdrop-blur, 60px));
    opacity: 0.6;
}

/* ════════════════════════════════════════════════════════════════════════════
   Typography - Paragraph & Text Styles
   ════════════════════════════════════════════════════════════════════════════ */

p {
    margin-top: var(--paragraph-spacing-before, 0.5rem);
    margin-bottom: var(--paragraph-spacing-after, 1rem);
    line-height: var(--line-height-body, 1.7);
    text-align: var(--text-align, left);
    text-indent: var(--indent-first-line, 0);
}

.content-text p {
    color: var(--color-text);
    font-size: var(--font-size-text, 1rem);
}

/* ════════════════════════════════════════════════════════════════════════════
   Code Block Styles
   ════════════════════════════════════════════════════════════════════════════ */

.code-block {
    font-family: var(--font-code);
    white-space: pre-wrap;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 1.75rem;
    color: var(--color-text);
    box-shadow: var(--shadow);
    max-width: 100%;
    overflow-x: auto;
    position: relative;
    line-height: 1.6;
}

.code-block::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient);
}

/* Syntax Highlighting with Theme Variables */
.code-syntax .keyword,
.code-block .keyword { 
    color: var(--syntax-keyword, #f87171);
    font-weight: 600;
}

.code-syntax .string,
.code-block .string { 
    color: var(--syntax-string, #34d399);
}

.code-syntax .comment,
.code-block .comment { 
    color: var(--syntax-comment, #6b7280); 
    font-style: italic;
    opacity: 0.8;
}

.code-syntax .function,
.code-block .function { 
    color: var(--syntax-function, #60a5fa);
    font-weight: 500;
}

.code-syntax .number,
.code-block .number { 
    color: var(--syntax-number, #fbbf24); 
}

.code-syntax .variable,
.code-block .variable {
    color: var(--syntax-variable, #a78bfa);
}

/* Enhanced Content Styles with Typography Controls */
.content-h1 h1,
.content-h2 h2,
.content-h3 h3,
.content-h4 h4,
.content-h5 h5,
.content-h6 h6 {
    margin-top: var(--heading-spacing-before, 1.5rem);
    margin-bottom: var(--heading-spacing-after, 0.75rem);
    line-height: var(--line-height-heading, 1.3);
    text-align: var(--text-align, left);
}

.content-h1 h1 {
    color: var(--color-primary);
    text-shadow: 0 0 20px var(--color-primary), 0 4px 12px rgba(0, 0, 0, 0.3);
    font-size: var(--font-size-h1, clamp(2rem, 5vw, 3.5rem));
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    max-width: 100%;
    word-wrap: break-word;
}

.content-h2 h2 {
    color: var(--color-secondary);
    text-shadow: 0 0 15px var(--color-secondary);
    font-size: var(--font-size-h2, clamp(1.75rem, 4vw, 2.75rem));
    font-weight: 700;
    border-left: var(--heading-accent-border-width, 4px) solid var(--color-primary);
    padding-left: 1.5rem;
    max-width: 100%;
    word-wrap: break-word;
}

.content-h3 h3 {
    color: var(--color-accent);
    font-size: var(--font-size-h3, clamp(1.5rem, 3vw, 2rem));
    font-weight: 600;
    max-width: 100%;
    word-wrap: break-word;
}

.content-blockquote blockquote {
    border-left: var(--blockquote-border-width, 4px) solid var(--color-accent);
    padding-left: var(--indent-blockquote, 1.5rem);
    margin: 1.5rem 0;
    font-style: italic;
    color: var(--color-text-secondary);
    background: rgba(var(--color-surface), 0.3);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.2);
}

.content-blockquote blockquote::before {
    content: '"';
    font-size: 4rem;
    color: var(--color-accent);
    opacity: 0.3;
    position: absolute;
    margin-left: -2rem;
    margin-top: -1rem;
}

.content-list-item ul,
.content-numbered-item ol {
    margin-left: var(--list-indent, 2rem);
    line-height: var(--line-height-body, 1.8);
}

.content-list-item li,
.content-numbered-item li {
    margin-bottom: 0.75rem;
    color: var(--color-text);
    text-align: var(--text-align, left);
}

.content-list-item li::marker {
    color: var(--color-primary);
    font-size: 1.2em;
}

/* Task List Styling */
.content-task-list li {
    list-style: none;
    margin-left: -1.5rem;
}

.content-task-list li::before {
    content: '☐';
    color: var(--color-accent);
    font-size: 1.5em;
    margin-right: 0.75rem;
}

.content-task-list li.checked::before {
    content: '☑';
    color: var(--color-primary);
}

/* Image Styling */
.content-image img {
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    max-width: 100%;
    height: auto;
    border: 2px solid var(--color-primary);
}

/* Link Styling */
.content-link a {
    color: var(--color-primary);
    text-decoration: none;
    border-bottom: 2px solid var(--color-primary);
    padding-bottom: 2px;
    transition: all 0.3s ease;
}

.content-link a:hover {
    color: var(--color-secondary);
    border-bottom-color: var(--color-secondary);
    text-shadow: 0 0 10px var(--color-secondary);
}

/* ════════════════════════════════════════════════════════════════════════════
   Typography Components
   ════════════════════════════════════════════════════════════════════════════ */

.badge {
    letter-spacing: 0.35em;
    font-size: 0.65rem;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.6);
    font-weight: 600;
}

/* ════════════════════════════════════════════════════════════════════════════
   Button Styles
   ════════════════════════════════════════════════════════════════════════════ */

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover:not(:disabled) {
    background: #2563eb;
    box-shadow: 0 4px 8px rgba(59, 130, 246, 0.4);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-secondary:hover:not(:disabled) {
    border-color: var(--color-primary);
    background: var(--color-surface-hover);
}

.btn-secondary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-tertiary {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-tertiary:hover:not(:disabled) {
    border-color: var(--color-cyan);
    color: var(--color-cyan);
    background: rgba(6, 182, 212, 0.1);
}

/* Reset Button - Warning Style */
#resetBtn {
    border-color: rgba(239, 68, 68, 0.3);
    color: #ef4444;
}

#resetBtn:hover:not(:disabled) {
    border-color: var(--color-error);
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

/* ════════════════════════════════════════════════════════════════════════════
   Configuration Panel Styles
   ════════════════════════════════════════════════════════════════════════════ */

.config-panel {
    background: var(--color-surface);
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
}

.config-panel input,
.config-panel textarea,
.config-panel select {
    background: var(--color-background);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    border-radius: var(--border-radius);
    padding: 0.5rem 0.75rem;
    width: 100%;
    font-family: inherit;
    transition: all 0.2s ease;
}

.config-panel textarea {
    font-family: var(--font-code);
    resize: vertical;
}

.config-panel input:focus,
.config-panel textarea:focus,
.config-panel select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* ════════════════════════════════════════════════════════════════════════════
   Status & Progress Components
   ════════════════════════════════════════════════════════════════════════════ */

.status-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    border-radius: 999px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: 0.5rem 1rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--color-text-secondary);
}

.status-pill.online::before {
    content: '';
    display: block;
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 999px;
    background: var(--color-success);
    animation: pulse 2s ease-in-out infinite;
}

.status-pill.recording::before {
    content: '';
    display: block;
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 999px;
    background: var(--color-error);
    animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { 
        opacity: 1; 
    }
    50% { 
        opacity: 0.5; 
    }
}

.pulse {
    animation: pulse 2s ease-in-out infinite;
}

/* ════════════════════════════════════════════════════════════════════════════
   Advanced Transition Animations
   ════════════════════════════════════════════════════════════════════════════ */

@keyframes matrixScroll {
    0% {
        background-position: 0% 0%;
    }
    100% {
        background-position: 0% 200%;
    }
}

@keyframes glitchSkew {
    0% {
        transform: skew(0deg);
    }
    25% {
        transform: skew(2deg);
    }
    50% {
        transform: skew(-2deg);
    }
    75% {
        transform: skew(1deg);
    }
    100% {
        transform: skew(0deg);
    }
}

@keyframes pixelateIn {
    0% {
        filter: blur(20px);
        opacity: 0;
    }
    50% {
        filter: blur(10px);
    }
    100% {
        filter: blur(0px);
        opacity: 1;
    }
}

@keyframes scanline {
    0% {
        transform: translateY(-100%);
    }
    100% {
        transform: translateY(100%);
    }
}

/* Code Block Enhanced Animations */
@keyframes codeHighlight {
    0%, 100% {
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    }
    50% {
        box-shadow: 0 8px 32px var(--color-primary), 0 0 40px rgba(var(--color-primary), 0.3);
    }
}

.code-block:hover {
    animation: codeHighlight 2s ease-in-out infinite;
}

/* Heading Glow Effects */
@keyframes textGlow {
    0%, 100% {
        text-shadow: 0 0 10px var(--color-primary), 0 0 20px var(--color-primary);
    }
    50% {
        text-shadow: 0 0 20px var(--color-primary), 0 0 40px var(--color-primary), 0 0 60px var(--color-secondary);
    }
}

.content-h1 h1:hover,
.content-h2 h2:hover {
    animation: textGlow 1.5s ease-in-out infinite;
}

.progress-bar {
    width: 100%;
    height: 0.5rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 999px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: var(--color-primary);
    border-radius: 999px;
    transition: width 0.3s ease;
}

/* ════════════════════════════════════════════════════════════════════════════
   Template Card Styles
   ════════════════════════════════════════════════════════════════════════════ */

.template-card {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.template-card:hover {
    border-color: var(--color-cyan);
    box-shadow: 0 0 0 1px var(--color-cyan);
}

.template-card.active {
    border-color: var(--color-primary);
    background: rgba(59, 130, 246, 0.1);
    box-shadow: 0 0 0 1px var(--color-primary);
}

/* ════════════════════════════════════════════════════════════════════════════
   File Upload Zone
   ════════════════════════════════════════════════════════════════════════════ */

.file-upload-zone {
    border: 2px dashed var(--color-border);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background: var(--color-surface);
}

.file-upload-zone:hover {
    border-color: var(--color-cyan);
    background: rgba(6, 182, 212, 0.05);
}

.file-upload-zone.dragging {
    border-color: var(--color-primary);
    background: rgba(59, 130, 246, 0.1);
}

/* ════════════════════════════════════════════════════════════════════════════
   Security Badge
   ════════════════════════════════════════════════════════════════════════════ */

.security-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(16, 185, 129, 0.1);
    color: #10b981;
    padding: 0.25rem 0.75rem;
    border-radius: 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
}

.security-badge::before {
    content: '';
}

/* ════════════════════════════════════════════════════════════════════════════
   Tab System
   ════════════════════════════════════════════════════════════════════════════ */

.tab-button {
    padding: 0.75rem 1.5rem;
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    font-weight: 500;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
}

.tab-button.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ════════════════════════════════════════════════════════════════════════════
   Slide Content Structured Styles - ใช้กับเนื้อหาจาก Markdown
   ════════════════════════════════════════════════════════════════════════════ */

.smart-layout-root {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: 100%;
    gap: 1.5rem;
    padding: 0;
}

.slide-heading {
    text-align: center;
    width: 100%;
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
    word-wrap: break-word;
    overflow-wrap: break-word;
    word-break: break-word;
    line-height: var(--line-height-heading, 1.3);
    hyphens: auto;
}

.slide-h1 {
    font-size: var(--font-size-h1, clamp(1.75rem, 4.5vw, 3rem));
    font-weight: 800;
    margin-top: var(--heading-spacing-before, 1.5rem);
    margin-bottom: var(--heading-spacing-after, 0.75rem);
    color: var(--color-primary);
    text-shadow: 0 0 20px var(--color-primary);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    max-width: 100%;
}

.slide-h2 {
    font-size: var(--font-size-h2, clamp(1.5rem, 3.5vw, 2.5rem));
    font-weight: 700;
    margin-top: var(--heading-spacing-before, 1.5rem);
    margin-bottom: var(--heading-spacing-after, 0.75rem);
    color: var(--color-secondary);
    text-shadow: 0 0 15px var(--color-secondary);
    max-width: 100%;
}

.slide-h3 {
    font-size: var(--font-size-h3, clamp(1.25rem, 2.75vw, 1.9rem));
    font-weight: 600;
    margin-top: var(--heading-spacing-before, 1.5rem);
    margin-bottom: var(--heading-spacing-after, 0.75rem);
    color: var(--color-cyan);
    max-width: 100%;
}

.slide-h4 {
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    font-weight: 600;
    margin-top: var(--heading-spacing-before, 1.5rem);
    margin-bottom: var(--heading-spacing-after, 0.75rem);
}

.slide-h5 {
    font-size: clamp(1.1rem, 2vw, 1.5rem);
    font-weight: 600;
    margin-top: var(--heading-spacing-before, 1.5rem);
    margin-bottom: var(--heading-spacing-after, 0.75rem);
}

.slide-h6 {
    font-size: clamp(1rem, 1.5vw, 1.25rem);
    font-weight: 500;
    margin-top: var(--heading-spacing-before, 1.5rem);
    margin-bottom: var(--heading-spacing-after, 0.75rem);
}

.slide-text,
.slide-text p {
    font-size: var(--font-size-text, clamp(1.1rem, 1.8vw, 1.6rem));
    line-height: var(--line-height-body, 1.7);
    margin-top: var(--paragraph-spacing-before, 0.5rem);
    margin-bottom: var(--paragraph-spacing-after, 1rem);
    text-align: var(--text-align, center);
    text-indent: var(--indent-first-line, 0);
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
    color: var(--color-text);
    word-break: break-word;
    overflow-wrap: break-word;
}

.slide-text-preview {
    font-size: clamp(1rem, 1.6vw, 1.4rem);
    color: var(--color-text-secondary);
    font-style: italic;
    opacity: 0.8;
}

.smart-list {
    width: 100%;
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--list-indent, 1.5rem);
    list-style: none;
}

.slide-list-item {
    font-size: var(--font-size-text, clamp(1.1rem, 1.8vw, 1.6rem));
    line-height: var(--line-height-body, 1.7);
    margin-bottom: 0.75rem;
    padding-left: var(--list-indent, 1.5rem);
    text-indent: calc(-1 * var(--list-indent, 1.5rem));
    color: var(--color-text);
    word-break: break-word;
    overflow-wrap: break-word;
}

.slide-blockquote {
    border-left: var(--blockquote-border-width, 4px) solid var(--color-cyan);
    padding-left: var(--indent-blockquote, 1.5rem);
    padding-top: 1rem;
    padding-bottom: 1rem;
    margin-left: var(--indent-blockquote, 1.5rem);
    margin-top: var(--paragraph-spacing-before, 0.5rem);
    margin-bottom: var(--paragraph-spacing-after, 1rem);
    font-style: italic;
    font-size: clamp(1.25rem, 2vw, 1.75rem);
    line-height: var(--line-height-body, 1.7);
    color: var(--color-text-secondary);
    background: rgba(19, 35, 55, 0.3);
    border-radius: 0.5rem;
    max-width: 85%;
}

.slide-code {
    max-width: 90%;
    margin-left: auto;
    margin-right: auto;
    margin-top: var(--paragraph-spacing-before, 0.5rem);
    margin-bottom: var(--paragraph-spacing-after, 1rem);
}

.slide-code .code-block {
    font-family: var(--font-code, 'Source Code Pro', monospace);
    font-size: var(--font-size-code, clamp(0.9rem, 1.5vw, 1.1rem));
    line-height: 1.5;
}

.slide-image {
    max-width: 80%;
    height: auto;
    border-radius: 0.75rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    margin-left: auto;
    margin-right: auto;
    display: block;
    margin-bottom: 1rem;
    border: var(--image-border-width, 2px) solid var(--color-primary);
}

.slide-link {
    color: var(--color-cyan);
    text-decoration: underline;
    text-decoration-thickness: var(--link-underline-width, 2px);
    font-size: clamp(1.25rem, 2vw, 1.75rem);
    transition: all 0.2s ease;
}

.slide-link:hover {
    color: var(--color-secondary);
    text-shadow: 0 0 10px var(--color-secondary);
}

/* ════════════════════════════════════════════════════════════════════════════
   Table & HR Styles
   ════════════════════════════════════════════════════════════════════════════ */

.slide-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
    border: var(--table-border-width, 1px) solid var(--color-accent);
}

.slide-table th {
    border: var(--table-border-width, 1px) solid var(--color-accent);
    padding: 1rem;
    background-color: var(--color-accent);
    color: white;
    font-weight: 600;
    text-align: left;
}

.slide-table td {
    border: var(--table-border-width, 1px) solid var(--color-accent);
    padding: 0.75rem 1rem;
    color: var(--color-text);
}

.slide-table tr:nth-child(even) {
    background-color: rgba(var(--color-surface), 0.3);
}

.slide-hr {
    border: 0;
    border-top: var(--hr-border-width, 2px) solid var(--color-accent);
    margin: 1.5rem 0;
    opacity: 0.7;
}

/* ════════════════════════════════════════════════════════════════════════════
   Timeline Page Indicator
   ════════════════════════════════════════════════════════════════════════════ */

.timeline-page-indicator {
    font-size: 0.75rem;
    padding: 0.125rem 0.5rem;
    background-color: var(--color-accent);
    color: var(--color-text);
    border-radius: 0.25rem;
    opacity: 0.8;
}

/* Slide Page Indicator (on stage) */
.slide-page-indicator {
    position: absolute;
    top: var(--page-indicator-top, 16px);
    right: var(--page-indicator-right, 16px);
    font-size: var(--page-indicator-font-size, 0.875rem);
    opacity: var(--page-indicator-opacity, 0.7);
    z-index: 100;
}

.slide-page-indicator span {
    display: inline-block;
    padding: var(--page-indicator-padding-y, 4px) var(--page-indicator-padding-x, 12px);
    background-color: var(--page-indicator-bg-color, rgba(22, 78, 99, 0.5));
    color: var(--page-indicator-text-color, #a5f3fc);
    border-radius: 0.375rem;
}

/* ════════════════════════════════════════════════════════════════════════════
   Collapsible Settings Sections
   ════════════════════════════════════════════════════════════════════════════ */

.settings-section summary {
    list-style: none;
    transition: color 0.15s ease;
    user-select: none;
    cursor: pointer;
}

.settings-section summary::-webkit-details-marker {
    display: none;
}

.settings-section summary > span:first-child {
    display: inline-block;
    transition: transform 0.15s ease;
    font-size: 0.7em;
}

.settings-section[open] summary > span:first-child {
    transform: rotate(90deg);
}

.settings-section summary:hover {
    color: #e2e8f0;
}

/* ════════════════════════════════════════════════════════════════════════════
   Responsive Design
   ════════════════════════════════════════════════════════════════════════════ */

@media (max-width: 768px) {
    .stage-frame {
        padding-top: 75%; /* Adjusted for mobile */
    }
    
    .scene {
        padding: 1.5rem;
    }
    
    .code-block {
        padding: 1rem;
        font-size: 0.875rem;
    }
    
    .smart-layout-root {
        gap: 1rem;
    }
    
    .slide-heading,
    .slide-text,
    .smart-list,
    .slide-blockquote,
    .slide-code {
        max-width: 95%;
    }
}


@media (max-width: 640px) {
    .btn-primary,
    .btn-secondary {
        padding: 0.625rem 1.25rem;
        font-size: 0.875rem;
    }
}

/* ═══════════════════════════════════════════════════════════════════════════
   EXIT CONFIRMATION DIALOG
   ═══════════════════════════════════════════════════════════════════════════ */

.exit-confirmation-dialog {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.exit-confirmation-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    animation: fadeIn 0.15s ease;
}

.exit-confirmation-content {
    position: relative;
    background: #1e293b;
    border-radius: 8px;
    padding: 1.25rem;
    max-width: 380px;
    width: 90%;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.1);
    animation: slideUp 0.2s ease;
}

.exit-confirmation-header {
    margin-bottom: 1rem;
}

.exit-confirmation-header h3 {
    margin: 0;
    font-size: 1.125rem;
    font-weight: 600;
    color: #f1f5f9;
}

.exit-confirmation-body {
    margin-bottom: 1.25rem;
    color: #cbd5e1;
    line-height: 1.5;
    font-size: 0.875rem;
}

.exit-confirmation-body p {
    margin: 0.5rem 0;
}

.exit-confirmation-body .warning-text {
    color: #fbbf24;
    font-weight: 500;
}

.exit-confirmation-footer {
    display: flex;
    gap: 0.5rem;
}

.exit-confirmation-footer button {
    flex: 1;
    padding: 0.5rem 0.75rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 6px;
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
}

.btn-exit-save {
    background: rgba(59, 130, 246, 0.2);
    color: #60a5fa;
    border-color: rgba(59, 130, 246, 0.3);
}

.btn-exit-save:hover {
    background: rgba(59, 130, 246, 0.3);
    border-color: rgba(59, 130, 246, 0.5);
}

.btn-exit-discard {
    background: rgba(239, 68, 68, 0.2);
    color: #f87171;
    border-color: rgba(239, 68, 68, 0.3);
}

.btn-exit-discard:hover {
    background: rgba(239, 68, 68, 0.3);
    border-color: rgba(239, 68, 68, 0.5);
}

.btn-exit-cancel {
    background: rgba(71, 85, 105, 0.2);
    color: #cbd5e1;
    border-color: rgba(255, 255, 255, 0.1);
}

.btn-exit-cancel:hover {
    background: rgba(71, 85, 105, 0.3);
    border-color: rgba(255, 255, 255, 0.15);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

/* ════════════════════════════════════════════════════════════════════════════
   Markdown Drop Zone
   ════════════════════════════════════════════════════════════════════════════ */

.markdown-drop-zone {
    position: relative;
}

.markdown-drop-zone textarea {
    width: 100%;
    transition: all 0.2s ease;
}

.markdown-drop-zone.drag-over textarea {
    opacity: 0.3;
    pointer-events: none;
}

.markdown-drop-zone .drop-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(10, 22, 40, 0.95);
    border: 2px dashed var(--color-primary);
    border-radius: var(--border-radius);
    backdrop-filter: blur(8px);
    z-index: 10;
    pointer-events: none;
}

.markdown-drop-zone.drag-over .drop-overlay {
    display: flex;
}

.drop-overlay.hidden {
    display: none;
}

.drop-content {
    text-align: center;
    animation: slideUp 0.3s ease;
}

.drop-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    animation: bounce 0.6s ease infinite;
}

.drop-text {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.5rem;
}

.drop-hint {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}