/* ==========================================================================
   THE MACO RESONANCE - DESIGN SYSTEM (VANILLA CSS)
   ========================================================================== */

   :root {
    --bg-color: #030308;
    --bg-card: rgba(10, 10, 18, 0.65);
    --bg-card-hover: rgba(15, 15, 26, 0.75);
    --border-color: rgba(255, 255, 255, 0.05);
    
    /* Primary Text */
    --text-color: #e2e8f0;
    --text-dim: #94a3b8;
    --text-dark: #64748b;
    
    /* Materia Themes / Accent Colors */
    --mako-green: #3cf090;
    --mako-green-dim: #1e7a4b;
    --mako-glow: rgba(60, 240, 144, 0.15);
    
    --magic-blue: #3a86ff;
    --magic-blue-dim: #1d4b99;
    --magic-glow: rgba(58, 134, 255, 0.15);
    
    --summon-red: #ef4444;
    --summon-red-dim: #991b1b;
    --summon-glow: rgba(239, 68, 68, 0.15);
    
    --support-yellow: #ffd166;
    --support-yellow-dim: #b38f3b;
    --support-glow: rgba(255, 209, 102, 0.15);

    --border-glow: rgba(255, 255, 255, 0.08);
    
    /* Layout & Animation */
    --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-normal: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-slow: 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    --border-radius-lg: 16px;
    --border-radius-md: 8px;
    
    /* Font sizes */
    --font-size-base: 1.05rem;
    --font-size-h1: clamp(2.2rem, 5vw, 3.2rem);
    --font-size-h2: clamp(1.6rem, 3.5vw, 2.2rem);
    --font-size-h3: clamp(1.2rem, 2.5vw, 1.5rem);
    
    /* Dynamic Font Zoom Factor */
    --font-scale: 1;
}

/* ==========================================================================
   RESET & BASE STYLES
   ========================================================================== */

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

body {
    background-color: var(--bg-color);
    background-image: 
        radial-gradient(circle at 80% 20%, rgba(60, 240, 144, 0.04) 0%, transparent 45%),
        radial-gradient(circle at 15% 85%, rgba(58, 134, 255, 0.04) 0%, transparent 45%),
        linear-gradient(rgba(255, 255, 255, 0.003) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.003) 1px, transparent 1px);
    background-size: 100% 100%, 100% 100%, 50px 50px, 50px 50px;
    background-attachment: fixed;
    color: var(--text-color);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    height: 100vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    font-size: var(--font-size-base);
    line-height: 1.85;
    -webkit-font-smoothing: antialiased;
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.08) transparent;
}

.font-mono {
    font-family: 'Space Mono', 'JetBrains Mono', 'Courier New', monospace;
}

/* ==========================================================================
   AMBIENT BACKGROUNDS & SHADERS
   ========================================================================== */

.canvas-wrapper {
    position: relative;
    width: 100%;
    height: 280px;
    margin: 10px 0 15px;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    background: rgba(0, 0, 0, 0.45);
    border: 1px solid rgba(255, 255, 255, 0.06);
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.8);
}

#canvas3d {
    width: 100% !important;
    height: 100% !important;
    display: block;
    outline: none;
}

/* Screen Effects: scanlines overlay */
.scanlines {
    position: fixed;
    inset: 0;
    background: linear-gradient(
        rgba(18, 16, 16, 0) 50%, 
        rgba(0, 0, 0, 0.15) 50%
    );
    background-size: 100% 4px;
    z-index: 1;
    pointer-events: none;
    opacity: 0.4;
}

.glow-radial {
    position: fixed;
    inset: 0;
    background: radial-gradient(circle at 75% 50%, rgba(60, 240, 144, 0.03) 0%, transparent 70%);
    z-index: 1;
    pointer-events: none;
}

/* ==========================================================================
   LAYOUT STRUCTURE
   ========================================================================== */

.app-container {
    flex: 1;
    width: 100%;
    padding: 20px 30px;
    display: flex;
    flex-direction: column;
    min-height: 0;
    overflow: hidden;
}

/* ==========================================================================
   HEADER
   ========================================================================== */

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.eyebrow {
    font-family: 'Space Mono', monospace;
    font-size: 0.75rem;
    letter-spacing: 4px;
    color: var(--text-dim);
    text-transform: uppercase;
    display: block;
    margin-bottom: 6px;
}

.main-title {
    font-family: 'Outfit', sans-serif;
    font-size: clamp(1.5rem, 3.5vw, 2.2rem);
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #ffffff 40%, var(--mako-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 0 20px rgba(60, 240, 144, 0.1);
}

.system-status {
    background: rgba(10, 10, 18, 0.4);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 50px;
    display: flex;
    align-items: center;
    gap: 10px;
    backdrop-filter: blur(8px);
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--text-dark);
}

.status-indicator.active {
    background-color: var(--mako-green);
    box-shadow: 0 0 10px var(--mako-green);
    animation: pulse 2s infinite;
}

.status-text {
    font-size: 0.7rem;
    letter-spacing: 2px;
    font-weight: 600;
    color: var(--text-dim);
}

/* ==========================================================================
   GLASS PANELS (Reusable Glassmorphism System)
   ========================================================================== */

.glass-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    backdrop-filter: blur(16px) saturate(130%);
    -webkit-backdrop-filter: blur(16px) saturate(130%);
    box-shadow: 0 20px 50px -15px rgba(0, 0, 0, 0.7);
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 12px;
    margin-bottom: 18px;
    border-bottom: 1px solid var(--border-color);
}

.panel-header-dots {
    display: flex;
    gap: 4px;
}

.panel-header-dots span {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
}

/* ==========================================================================
   WORKSPACE GRID (Split Screen)
   ========================================================================== */

.workspace {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 30px;
    flex: 1;
    min-height: 0;
}

/* Left panel - Hud widgets */
.panel-left {
    display: flex;
    flex-direction: column;
    gap: 20px;
    overflow-y: auto;
    min-height: 0;
}

.visualizer-card {
    flex-grow: 1;
    padding: 24px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
}

.visualizer-instructions {
    margin-top: 15px;
    line-height: 1.5;
}

.hud-stats {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: auto;
    padding-top: 20px;
    border-top: 1px dashed rgba(255, 255, 255, 0.08);
}

.hud-stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
}

.hud-label {
    color: var(--text-dark);
    letter-spacing: 1px;
}

.hud-value {
    font-weight: 700;
    letter-spacing: 0.5px;
    transition: color var(--transition-normal);
}

.metrics-card {
    padding: 12px 16px;
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.metric-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.03);
    border-radius: var(--border-radius-md);
    padding: 6px 4px;
    text-align: center;
}

.metric-label {
    font-size: 0.65rem;
    color: var(--text-dark);
    margin-bottom: 4px;
    letter-spacing: 1px;
}

.metric-status {
    font-size: 0.75rem;
    font-weight: 600;
}

/* Accent texts */
.text-accent-green { color: var(--mako-green); text-shadow: 0 0 10px var(--mako-glow); }
.text-accent-blue { color: var(--magic-blue); text-shadow: 0 0 10px var(--magic-glow); }
.text-accent-red { color: var(--summon-red); text-shadow: 0 0 10px var(--summon-glow); }
.text-accent-yellow { color: var(--support-yellow); text-shadow: 0 0 10px var(--support-glow); }

.text-error { color: #f87171; text-shadow: 0 0 8px rgba(248, 113, 113, 0.2); }
.text-ok { color: #4ade80; text-shadow: 0 0 8px rgba(74, 222, 128, 0.2); }
.text-dim { color: var(--text-dim); }
.text-sm { font-size: 0.85rem; }
.text-xs { font-size: 0.75rem; }

/* Right Panel: Reader */
.panel-right {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    height: 100%;
}

/* ==========================================================================
   TAB NAVIGATION
   ========================================================================== */

.tab-navigation {
    display: flex;
    border-bottom: 2px solid rgba(255, 255, 255, 0.08);
    background: rgba(8, 8, 15, 0.95);
    border-top-left-radius: var(--border-radius-lg);
    border-top-right-radius: var(--border-radius-lg);
    width: 100%;
    padding: 10px 10px 0 10px; /* spacing above tabs so they stand out */
    gap: 6px;
}

.tab-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 8px;
    background: rgba(255, 255, 255, 0.01);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-bottom: none;
    border-top-left-radius: 8px;
    border-top-right-radius: 8px;
    font-size: 0.8rem;
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    letter-spacing: 1.2px;
    text-transform: uppercase;
    cursor: pointer;
    position: relative;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    outline: none;
}

.tab-num {
    font-family: 'Space Mono', monospace;
    font-size: 0.75rem;
    opacity: 0.6;
}

.tab-title {
    font-weight: 700;
}

/* Color-coded styles */

/* Tab 0 - Genesis (Green) */
.tab-btn[data-chapter="0"] {
    color: rgba(60, 240, 144, 0.45);
    border-color: rgba(60, 240, 144, 0.12);
}
.tab-btn[data-chapter="0"]:hover {
    color: #3cf090;
    background: rgba(60, 240, 144, 0.05);
    border-color: rgba(60, 240, 144, 0.25);
}
.tab-btn[data-chapter="0"].active {
    color: #3cf090;
    background: rgba(60, 240, 144, 0.12);
    border-color: rgba(60, 240, 144, 0.45);
    box-shadow: 0 -4px 15px rgba(60, 240, 144, 0.12);
}
.tab-btn[data-chapter="0"]::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 10%;
    width: 80%;
    height: 3px;
    border-radius: 2px;
    background: var(--mako-green);
    box-shadow: 0 0 10px var(--mako-green);
    opacity: 0;
    transition: opacity 0.3s ease;
}
.tab-btn[data-chapter="0"].active::after {
    opacity: 1;
}

/* Tab 1 - Divergence (Blue) */
.tab-btn[data-chapter="1"] {
    color: rgba(58, 134, 255, 0.45);
    border-color: rgba(58, 134, 255, 0.12);
}
.tab-btn[data-chapter="1"]:hover {
    color: var(--magic-blue);
    background: rgba(58, 134, 255, 0.05);
    border-color: rgba(58, 134, 255, 0.25);
}
.tab-btn[data-chapter="1"].active {
    color: var(--magic-blue);
    background: rgba(58, 134, 255, 0.12);
    border-color: rgba(58, 134, 255, 0.45);
    box-shadow: 0 -4px 15px rgba(58, 134, 255, 0.12);
}
.tab-btn[data-chapter="1"]::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 10%;
    width: 80%;
    height: 3px;
    border-radius: 2px;
    background: var(--magic-blue);
    box-shadow: 0 0 10px var(--magic-blue);
    opacity: 0;
    transition: opacity 0.3s ease;
}
.tab-btn[data-chapter="1"].active::after {
    opacity: 1;
}

/* Tab 2 - Labyrinth (Red) */
.tab-btn[data-chapter="2"] {
    color: rgba(239, 68, 68, 0.45);
    border-color: rgba(239, 68, 68, 0.12);
}
.tab-btn[data-chapter="2"]:hover {
    color: var(--summon-red);
    background: rgba(239, 68, 68, 0.05);
    border-color: rgba(239, 68, 68, 0.25);
}
.tab-btn[data-chapter="2"].active {
    color: var(--summon-red);
    background: rgba(239, 68, 68, 0.12);
    border-color: rgba(239, 68, 68, 0.45);
    box-shadow: 0 -4px 15px rgba(239, 68, 68, 0.12);
}
.tab-btn[data-chapter="2"]::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 10%;
    width: 80%;
    height: 3px;
    border-radius: 2px;
    background: var(--summon-red);
    box-shadow: 0 0 10px var(--summon-red);
    opacity: 0;
    transition: opacity 0.3s ease;
}
.tab-btn[data-chapter="2"].active::after {
    opacity: 1;
}

/* Tab 3 - Grace (Yellow) */
.tab-btn[data-chapter="3"] {
    color: rgba(255, 209, 102, 0.45);
    border-color: rgba(255, 209, 102, 0.12);
}
.tab-btn[data-chapter="3"]:hover {
    color: var(--support-yellow);
    background: rgba(255, 209, 102, 0.05);
    border-color: rgba(255, 209, 102, 0.25);
}
.tab-btn[data-chapter="3"].active {
    color: var(--support-yellow);
    background: rgba(255, 209, 102, 0.12);
    border-color: rgba(255, 209, 102, 0.45);
    box-shadow: 0 -4px 15px rgba(255, 209, 102, 0.12);
}
.tab-btn[data-chapter="3"]::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 10%;
    width: 80%;
    height: 3px;
    border-radius: 2px;
    background: var(--support-yellow);
    box-shadow: 0 0 10px var(--support-yellow);
    opacity: 0;
    transition: opacity 0.3s ease;
}
.tab-btn[data-chapter="3"].active::after {
    opacity: 1;
}

/* ==========================================================================
   READER CARD
   ========================================================================== */

.reader-viewport {
    flex-grow: 1;
    overflow-y: auto;
    position: relative;
    padding: 40px 60px;
    scroll-behavior: smooth;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.reader-content {
    width: 100%;
    max-width: 720px; /* Optimal reading line length */
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.reader-content.fade-out {
    opacity: 0;
    transform: translateY(15px);
}

.reader-content:focus-visible {
    outline: 1px dashed var(--mako-green);
    outline-offset: 15px;
}

/* ==========================================================================
   TYPOGRAPHY & MARKDOWN STYLING
   ========================================================================== */

.markdown-body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: #e2e8f0;
    font-size: calc(var(--font-size-base) * var(--font-scale));
    line-height: 1.85;
}

.markdown-body h1 {
    font-family: 'Playfair Display', Georgia, serif;
    font-size: calc(var(--font-size-h1) * var(--font-scale));
    font-weight: 700;
    margin-top: 0;
    margin-bottom: 30px;
    line-height: 1.3;
    color: #ffffff;
    border-left: 4px solid var(--mako-green);
    padding-left: 20px;
    transition: border-color var(--transition-normal);
}

.markdown-body h2 {
    font-family: 'Outfit', sans-serif;
    font-size: calc(var(--font-size-h2) * var(--font-scale));
    font-weight: 600;
    margin-top: 40px;
    margin-bottom: 20px;
    line-height: 1.3;
    color: #ffffff;
    letter-spacing: -0.5px;
    padding-bottom: 10px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

/* Style Roman numerals inside headers */
.markdown-body h2 .roman-num {
    font-family: 'Space Mono', monospace;
    font-size: 0.85em;
    color: var(--mako-green);
    margin-right: 12px;
}

.markdown-body h3 {
    font-family: 'Outfit', sans-serif;
    font-size: calc(var(--font-size-h3) * var(--font-scale));
    font-weight: 600;
    margin-top: 30px;
    margin-bottom: 15px;
    color: var(--text-color);
}

.markdown-body p {
    font-family: 'Inter', sans-serif;
    font-size: 1.05rem;
    font-weight: 400;
    color: #cbd5e1; /* Highly legible slate-300 */
    margin-bottom: 25px;
    text-align: left;
    letter-spacing: 0.1px;
}

/* Code block / formulas box */
.formula-block {
    background: rgba(0, 0, 0, 0.45);
    border: 1px dashed rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-md);
    padding: 18px 25px;
    margin: 25px 0;
    font-size: 1.15rem;
    text-align: center;
    letter-spacing: 1px;
    box-shadow: inset 0 0 15px rgba(0, 0, 0, 0.5);
}

.markdown-body pre, 
.markdown-body code {
    font-family: 'Space Mono', monospace;
    font-size: 0.9em;
}

.markdown-body pre {
    background: rgba(0, 0, 0, 0.35);
    border: 1px solid var(--border-color);
    border-left: 2px solid var(--mako-green);
    border-radius: var(--border-radius-md);
    padding: 16px 20px;
    margin: 25px 0;
    overflow-x: auto;
    width: 100%;
}

.markdown-body code {
    background: rgba(255, 255, 255, 0.05);
    padding: 3px 6px;
    border-radius: 4px;
    color: #ffffff;
}

.markdown-body pre code {
    background: transparent;
    padding: 0;
    border-radius: 0;
    color: var(--text-color);
    display: block;
    line-height: 1.5;
}

.markdown-body blockquote {
    border-left: 4px solid var(--mako-green);
    background: rgba(255, 255, 255, 0.02);
    padding: 20px 24px;
    margin: 30px 0;
    border-radius: 0 var(--border-radius-md) var(--border-radius-md) 0;
    font-style: italic;
    color: var(--text-dim);
}

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

.markdown-body ul, 
.markdown-body ol {
    margin-bottom: 24px;
    padding-left: 24px;
}

.markdown-body li {
    margin-bottom: 8px;
    font-weight: 300;
}

/* ==========================================================================
   READER CONTROLS & FOOTER
   ========================================================================== */

.reader-footer {
    padding: 15px 30px;
    border-top: 1px solid var(--border-color);
    background: rgba(0, 0, 0, 0.15);
    border-bottom-left-radius: var(--border-radius-lg);
    border-bottom-right-radius: var(--border-radius-lg);
}

.reader-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.ctrl-btn {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    color: var(--text-dim);
    padding: 8px 14px;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    transition: all var(--transition-fast) ease;
}

.ctrl-btn:hover {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.15);
}

.ctrl-btn:active {
    transform: translateY(1px);
}

/* Font Resizer layout */
.text-resizer {
    display: flex;
    align-items: center;
    gap: 12px;
}

.font-size-indicator {
    min-width: 45px;
    text-align: center;
}

/* Spinner Loader */
.content-loader {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 0;
}

.spinner {
    width: 32px;
    height: 32px;
    border: 2px solid rgba(255, 255, 255, 0.05);
    border-top-color: var(--mako-green);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* ==========================================================================
   APP FOOTER
   ========================================================================== */

.footer {
    flex-shrink: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
    border-top: 1px solid var(--border-color);
    background: var(--bg-color);
}

.footer-left {
    display: flex;
    align-items: center;
    gap: 15px;
}

.footer-sep {
    opacity: 0.2;
}

/* ==========================================================================
   FOCUS / FULLSCREEN MODE
   ========================================================================== */

body.focus-mode .header,
body.focus-mode .panel-left,
body.focus-mode .reader-footer,
body.focus-mode .footer,
body.focus-mode .tab-navigation {
    display: none !important;
}

body.focus-mode .workspace {
    grid-template-columns: 1fr;
    height: 100vh;
    margin: 0;
}

body.focus-mode .app-container {
    padding: 0;
    justify-content: center;
}

body.focus-mode .panel-right {
    max-width: 800px;
    width: 90%;
    margin: 0 auto;
    border-radius: 0;
    border-top: none;
    border-bottom: none;
    background: rgba(10, 10, 18, 0.75);
    box-shadow: 0 0 100px rgba(0, 0, 0, 0.8);
    height: 100vh;
}

body.focus-mode .reader-viewport {
    padding: 60px 80px;
}

/* Float back close button for focus mode */
.focus-close-btn {
    position: fixed;
    top: 30px;
    right: 30px;
    z-index: 999;
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(10, 10, 18, 0.8);
    border: 1px solid var(--border-color);
    color: #ffffff;
    font-size: 1.2rem;
    cursor: pointer;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
    transition: all var(--transition-fast) ease;
    backdrop-filter: blur(8px);
}

.focus-close-btn:hover {
    transform: scale(1.1);
    background: #ffffff;
    color: #000000;
}

/* ==========================================================================
   ANIMATIONS & SCROLLBAR
   ========================================================================== */

@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.15); opacity: 0.7; }
    100% { transform: scale(1); opacity: 1; }
}

/* Custom Scrollbar (Webkit: Chrome, Edge, Safari) */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.2);
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.08);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.15);
}

/* Firefox scrollbar for reader viewport */
.reader-viewport {
    scrollbar-width: thin;
    scrollbar-color: var(--border-glow) transparent;
}

/* Special Scrollbar for reader viewport to look high tech */
.reader-viewport::-webkit-scrollbar-thumb {
    background: var(--border-glow);
    border: 1px solid var(--border-color);
    transition: background-color var(--transition-normal);
}

.reader-viewport.theme-green::-webkit-scrollbar-thumb { background: rgba(60, 240, 144, 0.2); }
.reader-viewport.theme-blue::-webkit-scrollbar-thumb { background: rgba(58, 134, 255, 0.2); }
.reader-viewport.theme-red::-webkit-scrollbar-thumb { background: rgba(239, 68, 68, 0.2); }
.reader-viewport.theme-yellow::-webkit-scrollbar-thumb { background: rgba(255, 209, 102, 0.2); }

/* ==========================================================================
   RESPONSIVE DESIGN (MOBIL & TABLET)
   ========================================================================== */

@media (max-width: 1024px) {
    body {
        height: auto;
        min-height: 100vh;
        overflow-y: auto;
    }
    
    .workspace {
        grid-template-columns: 1fr;
        flex: 0 0 auto;
    }
    
    .panel-left {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }
    
    .visualizer-card {
        min-height: 200px;
    }
    
    .app-container {
        overflow: visible;
        padding: 20px;
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-base: 0.95rem;
    }
    
    .app-container {
        overflow: visible;
        padding: 15px;
    }
    
    .header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
        margin-bottom: 20px;
    }
    
    .header-right {
        width: 100%;
    }
    
    .system-status {
        justify-content: center;
        width: 100%;
    }
    
    .panel-left {
        grid-template-columns: 1fr;
    }
    
    .tab-navigation {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tab-btn {
        padding: 14px 8px;
        border-bottom: 1px solid var(--border-color);
        border-right: 1px solid var(--border-color);
    }
    
    .tab-btn:nth-child(2n) {
        border-right: none;
    }
    
    .reader-viewport {
        padding: 30px 20px;
    }
    
    .markdown-body p {
        text-align: left; /* Better for reading on small screens */
    }
    
    .footer {
        flex-direction: column;
        gap: 10px;
        text-align: center;
        padding-top: 20px;
    }
    
    .footer-left {
        flex-direction: column;
        gap: 5px;
    }
    
    .footer-sep {
        display: none;
    }
}