/* ===== Box Sizing Reset ===== */
*, *::before, *::after {
    box-sizing: border-box;
}

/* ===== CSS Variables ===== */
:root {
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-bg-elevated: #ffffff;
    --color-bg-overlay: rgba(0, 0, 0, 0.5);
    
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #6b7280;
    --color-text-tertiary: #9ca3af;
    
    --color-border: #e5e7eb;
    --color-border-strong: #d1d5db;
    
    --color-primary: #3b82f6;
    --color-primary-hover: #2563eb;
    --color-primary-glow: rgba(59, 130, 246, 0.3);
    
    --color-accent: #8b5cf6;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-info: #06b6d4;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Typography */
    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji';
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;
    
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
}

/* Dark Theme */
[data-theme="dark"] {
    --color-bg-primary: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-elevated: #1e293b;
    --color-bg-overlay: rgba(0, 0, 0, 0.7);
    
    --color-text-primary: #f1f5f9;
    --color-text-secondary: #cbd5e1;
    --color-text-tertiary: #94a3b8;
    
    --color-border: #334155;
    --color-border-strong: #475569;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

/* ===== Base Styles ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    width: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg-primary);
    min-height: 100vh;
    transition: background-color var(--transition-base), color var(--transition-base);
    overflow-x: hidden;
}

/* ===== Settings Toggle ===== */
.page-home .settings-toggle {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 1000;
    width: 3rem;
    height: 3rem;
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border);
    background: var(--color-bg-elevated);
    color: var(--color-text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.page-home .settings-toggle:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.page-home .settings-icon {
    width: 1.25rem;
    height: 1.25rem;
}

/* ===== App Container ===== */
.page-home .app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
    overflow-x: hidden;
    width: 100%;
}

/* ===== Header ===== */
.page-home .header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.page-home .logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.page-home .logo-icon {
    width: 2.5rem;
    height: 2.5rem;
    color: var(--color-primary);
    filter: drop-shadow(0 0 8px var(--color-primary-glow));
}

.page-home .logo-text {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.02em;
}

.page-home .logo-accent {
    font-weight: 400;
    opacity: 0.8;
}

.page-home .tagline {
    color: var(--color-text-secondary);
    font-size: var(--font-size-lg);
}

/* ===== Settings Panel ===== */
.page-home .settings-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    max-width: 400px;
    height: 100vh;
    background: var(--color-bg-elevated);
    box-shadow: var(--shadow-xl);
    z-index: 2000;
    transform: translateX(100%);
    transition: transform var(--transition-base);
    overflow-y: auto;
}

.page-home .settings-panel[data-open="true"] {
    transform: translateX(0);
}

.page-home .settings-content {
    padding: var(--spacing-xl);
}

.page-home .settings-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
}

.page-home .settings-header h2 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
}

.page-home .settings-close {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text-secondary);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.page-home .settings-close:hover {
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
}

/* Setting Sections */
.page-home .setting-section {
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--color-border);
}

.page-home .setting-section:last-of-type {
    border-bottom: none;
}

.page-home .setting-section-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
}

.page-home .setting-section-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.5;
}

/* Setting Groups */
.page-home .setting-group {
    margin-bottom: var(--spacing-lg);
}

.page-home .setting-group-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.page-home .setting-info {
    flex: 1;
}

.page-home .setting-info label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
}

.page-home .setting-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    margin: 0;
    line-height: 1.4;
}

.page-home .setting-control {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

/* Enhanced Range Sliders */
.page-home .setting-group input[type="range"] {
    flex: 1;
    height: 8px;
    border-radius: var(--radius-full);
    background: linear-gradient(to right, 
        var(--color-primary) 0%, 
        var(--color-primary) 50%, 
        var(--color-bg-secondary) 50%, 
        var(--color-bg-secondary) 100%);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
    border: 1px solid var(--color-border);
}

.page-home .setting-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: var(--radius-full);
    background: white;
    cursor: pointer;
    border: 3px solid var(--color-primary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    transition: transform var(--transition-fast);
}

.page-home .setting-group input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.page-home .setting-group input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-full);
    background: white;
    cursor: pointer;
    border: 3px solid var(--color-primary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.page-home .setting-group input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.1);
}

.page-home .setting-value {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 48px;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: var(--font-size-base);
    font-variant-numeric: tabular-nums;
}

/* Inline Theme Toggle */
.page-home .theme-toggle-inline {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    background: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-base);
    flex-shrink: 0;
}

.page-home .theme-toggle-inline:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
    transform: scale(1.05);
}

.page-home .theme-toggle-inline .theme-icon {
    width: 20px;
    height: 20px;
}

[data-theme="dark"] .theme-toggle-inline .theme-icon {
    color: #fbbf24;
    stroke: currentColor;
}

[data-theme="light"] .theme-toggle-inline .theme-icon,
:root:not([data-theme]) .theme-toggle-inline .theme-icon {
    color: var(--color-text-secondary);
    stroke: currentColor;
}

.page-home .btn-reset {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text-primary);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-xl);
}

.page-home .btn-reset i {
    width: 16px;
    height: 16px;
}

.page-home .btn-reset:hover {
    background: var(--color-danger);
    color: white;
    border-color: var(--color-danger);
}

/* ===== Status Bar ===== */
.page-home .status-bar {
    background: var(--color-info);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.page-home .status-bar[data-type="error"] {
    background: var(--color-danger);
}

.page-home .status-bar[data-type="success"] {
    background: var(--color-success);
}

.page-home .status-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.page-home .status-icon {
    width: 1.25rem;
    height: 1.25rem;
}

/* ===== Server Info ===== */
.page-home .server-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-md);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
}

.page-home .server-info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.page-home .info-icon {
    width: 1rem;
    height: 1rem;
}

/* ===== Test Section ===== */
.page-home .test-section {
    margin-bottom: var(--spacing-2xl);
}

/* ===== Test Display (Gauge + Results Matrix) ===== */
.page-home .test-display {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    align-items: start;
    max-width: 100%;
    overflow: hidden;
}

@media (min-width: 769px) {
    .page-home .test-display {
        grid-template-columns: minmax(300px, 400px) 1fr;
        gap: var(--spacing-2xl);
    }
}

/* ===== Gauge Container ===== */
.page-home .gauge-container {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-2xl) var(--spacing-xl);
}

.page-home .gauge-wrapper {
    position: relative;
    width: 100%;
    max-width: 340px;
    aspect-ratio: 1 / 1;
}

.page-home .gauge-circle {
    position: relative;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: conic-gradient(
        from -135deg,
        transparent 0deg,
        var(--color-border) 0deg,
        var(--color-border) 270deg,
        transparent 270deg
    );
    mask: radial-gradient(
        circle,
        transparent 0%,
        transparent 55%,
        black 55%,
        black 100%
    );
    -webkit-mask: radial-gradient(
        circle,
        transparent 0%,
        transparent 55%,
        black 55%,
        black 100%
    );
    display: flex;
    align-items: center;
    justify-content: center;
}

.page-home .gauge-progress {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    z-index: 1;
    background: conic-gradient(
        from -135deg,
        transparent 0deg,
        #3b82f6 0deg,
        #8b5cf6 135deg,
        #ec4899 270deg,
        transparent 270deg
    );
    mask: radial-gradient(
        circle,
        transparent 0%,
        transparent 55%,
        black 55%,
        black 100%
    );
    -webkit-mask: radial-gradient(
        circle,
        transparent 0%,
        transparent 55%,
        black 55%,
        black 100%
    );
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.page-home .gauge-inner {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 65%;
    height: 65%;
    border-radius: 50%;
    background: var(--color-bg-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    z-index: 2;
    box-shadow: 0 0 0 1px var(--color-border);
}

.page-home .gauge-value-live {
    font-size: clamp(3rem, 8vw, 4.5rem);
    font-weight: 300;
    letter-spacing: -0.03em;
    color: var(--color-text-primary);
    font-variant-numeric: tabular-nums;
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.page-home .gauge-unit {
    font-size: var(--font-size-lg);
    font-weight: 400;
    color: var(--color-text-secondary);
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

.page-home .gauge-phase-label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-transform: capitalize;
    color: var(--color-text-tertiary);
    letter-spacing: 0.02em;
}

/* Round START button */
.page-home .gauge-start-button {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 85%;
    height: 85%;
    border-radius: 50%;
    border: none;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: white;
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 600;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-xl);
    z-index: 20;
}

.page-home .gauge-start-button:hover {
    transform: translate(-50%, -50%) scale(1.05);
    box-shadow: 0 20px 40px rgba(59, 130, 246, 0.4);
}

.page-home .gauge-start-button:active {
    transform: translate(-50%, -50%) scale(0.98);
}

.page-home .start-button-text {
    display: block;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* ===== Results Matrix (2x2 Grid) ===== */
.page-home .results-matrix {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg); /* Increased gap to prevent clipping */
    width: 100%;
    padding: var(--spacing-xs); /* Add padding to prevent glow clipping */
}

.page-home .matrix-card {
    background: var(--color-bg-elevated);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    transition: all var(--transition-base);
    min-height: 110px;
    position: relative; /* For progress border positioning */
    overflow: visible; /* Allow glow to show */
}

.page-home .matrix-card[data-status="complete"]::after {
    opacity: 0;
    transition: opacity 0.3s ease-out;
}

/* Animated progress border - simpler approach with outline */
.page-home .matrix-card {
    --progress: 0;
}

.page-home .matrix-card::before {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: var(--radius-xl);
    background: conic-gradient(
        from -90deg,
        var(--color-primary) calc(var(--progress) * 1%),
        transparent calc(var(--progress) * 1%)
    );
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask-composite: exclude;
    padding: 3px;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s;
}

.page-home .matrix-card[data-status="measuring"]::before {
    opacity: 1;
}

.page-home .matrix-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.page-home .matrix-icon i {
    width: 24px;
    height: 24px;
}

.page-home .matrix-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    min-width: 0;
    overflow: hidden;
}

.page-home .matrix-label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.page-home .matrix-value {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-xs);
}

.page-home .matrix-number {
    font-size: clamp(2.25rem, 5vw, 3rem);
    font-weight: 300;
    color: var(--color-text-primary);
    line-height: 1;
    font-variant-numeric: tabular-nums;
}

.page-home .matrix-unit {
    font-size: var(--font-size-lg);
    color: var(--color-text-tertiary);
    font-weight: 400;
    letter-spacing: 0.03em;
}

/* ===== Controls ===== */
.page-home .controls {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.page-home .btn-primary, .btn-secondary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: var(--font-size-lg);
    font-weight: 600;
    border-radius: var(--radius-full);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
}

.page-home .btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: white;
}

.page-home .btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 30px var(--color-primary-glow);
}

.page-home .btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.page-home .btn-secondary {
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.page-home .btn-secondary:hover {
    background: var(--color-danger);
    color: white;
    border-color: var(--color-danger);
}

.page-home .btn-icon {
    width: 1.25rem;
    height: 1.25rem;
}

/* ===== Progress Container ===== */
.page-home .progress-container {
    margin-bottom: var(--spacing-2xl);
}

.page-home .progress-bar {
    height: 8px;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
}

.page-home .progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    border-radius: var(--radius-full);
    transition: width var(--transition-base);
    width: 0%;
}

.page-home .progress-phases {
    display: flex;
    justify-content: space-between;
}

.page-home .phase {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
}

.page-home .phase-dot {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
    background: var(--color-border-strong);
    transition: all var(--transition-base);
}

.page-home .phase[data-status="active"] .phase-dot {
    background: var(--color-primary);
    box-shadow: 0 0 0 4px var(--color-primary-glow);
    animation: pulse 2s infinite;
}

.page-home .phase[data-status="complete"] .phase-dot {
    background: var(--color-success);
}

.page-home .phase-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    font-weight: 600;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* ===== History Section ===== */
.page-home .history-section {
    margin-bottom: var(--spacing-2xl);
}

.page-home .history-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.page-home .history-header h2 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
}

.page-home .history-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.page-home .btn-icon-small {
    width: 2.5rem;
    height: 2.5rem;
    border: 1px solid var(--color-border);
    background: var(--color-bg-elevated);
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.page-home .btn-icon-small:hover {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.page-home .history-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.page-home .history-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.page-home .history-item:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.page-home .history-item-data {
    display: flex;
    gap: var(--spacing-xl);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.page-home .history-item-time {
    color: var(--color-text-tertiary);
    font-size: var(--font-size-xs);
}

/* ===== Footer ===== */
.page-home .footer {
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-3xl);
}

.page-home .footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.page-home .why-amsterdam-banner {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
}

.page-home .banner-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.page-home .banner-icon {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
}

.page-home .banner-icon i {
    width: 32px;
    height: 32px;
}

.page-home .banner-text {
    flex: 1;
    min-width: 280px;
    color: white;
}

.page-home .banner-text h3 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin: 0 0 var(--spacing-sm) 0;
    color: white;
}

.page-home .banner-text p {
    margin: 0;
    line-height: 1.6;
    opacity: 0.95;
    font-size: var(--font-size-base);
}

.page-home .banner-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: white;
    color: var(--color-primary);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-base);
    flex-shrink: 0;
}

.page-home .banner-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.page-home .banner-cta i {
    width: 18px;
    height: 18px;
}

.page-home .footer-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.page-home .info-card {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-base);
}

.page-home .info-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.page-home .info-icon-wrapper {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    color: white;
}

.page-home .info-icon-wrapper i {
    width: 20px;
    height: 20px;
}

.page-home .info-card h3 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.page-home .info-card p {
    font-size: var(--font-size-sm);
    line-height: 1.6;
    color: var(--color-text-secondary);
    margin: 0;
}

.page-home .info-card strong {
    color: var(--color-primary);
    font-weight: 600;
}

.page-home .footer-note {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.page-home .footer-note p {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.6;
    margin: 0;
}

.page-home .footer-note i {
    flex-shrink: 0;
    width: 16px;
    height: 16px;
    margin-top: 2px;
}

.page-home .footer-copyright {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.page-home .footer-copyright p {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    margin: 0;
}

/* ===== Responsive Design ===== */

/* Tablet/Medium screens (769px - 1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
    .page-home .app-container {
        max-width: 100%;
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .page-home .test-display {
        grid-template-columns: 1fr;
        max-width: 600px;
        margin: 0 auto;
    }
    
    .page-home .gauge-wrapper {
        max-width: 320px;
    }
    
    .page-home .results-matrix {
        grid-template-columns: repeat(2, 1fr);
        max-width: 600px;
        margin: 0 auto;
    }
    
    .page-home .why-amsterdam-banner {
        max-width: 100%;
    }
    
    .page-home .banner-content {
        gap: var(--spacing-lg);
    }
    
    .page-home .footer-info-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
    }
}

/* Small tablets (601px - 768px) */
@media (min-width: 601px) and (max-width: 768px) {
    .page-home .app-container {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .page-home .test-display {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }
    
    .page-home .results-matrix {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .page-home .footer-info-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .page-home .controls {
        flex-direction: row;
        gap: var(--spacing-md);
    }
    
    .page-home .btn-primary, .btn-secondary {
        width: auto;
        flex: 1;
    }
}

/* Mobile screens (max 600px) */
@media (max-width: 600px) {
    .page-home .app-container {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .page-home .header {
        margin-bottom: var(--spacing-lg);
    }
    
    .page-home .logo-text {
        font-size: var(--font-size-2xl);
    }
    
    .page-home .tagline {
        font-size: var(--font-size-base);
    }
    
    .page-home .why-amsterdam-banner {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .page-home .banner-content {
        flex-direction: column;
        text-align: center;
    }
    
    .page-home .banner-icon {
        margin: 0 auto;
    }
    
    .page-home .banner-text {
        min-width: auto;
    }
    
    .page-home .banner-text h3 {
        font-size: var(--font-size-lg);
    }
    
    .page-home .banner-text p {
        font-size: var(--font-size-sm);
    }
    
    .page-home .banner-cta {
        width: 100%;
        justify-content: center;
    }
    
    .page-home .test-display {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .page-home .gauge-container {
        padding: var(--spacing-md);
    }
    
    .page-home .gauge-wrapper {
        max-width: 260px;
    }
    
    .page-home .gauge-value-live {
        font-size: clamp(2.5rem, 8vw, 3rem);
    }
    
    .page-home .gauge-unit {
        font-size: var(--font-size-base);
    }
    
    .page-home .gauge-phase-label {
        font-size: var(--font-size-xs);
    }
    
    .page-home .gauge-start-button {
        font-size: clamp(1.5rem, 5vw, 2rem);
    }
    
    .page-home .results-matrix {
        gap: var(--spacing-md); /* Increased for mobile to prevent horizontal clipping */
        width: 100%;
        max-width: 100%;
        padding: var(--spacing-xs); /* Padding to prevent glow clipping */
    }
    
    .page-home .matrix-card {
        padding: var(--spacing-md) var(--spacing-sm);
        min-height: 90px;
        gap: var(--spacing-sm);
        min-width: 0;
    }
    
    .page-home .matrix-icon {
        width: 40px;
        height: 40px;
    }
    
    .page-home .matrix-icon i {
        width: 20px;
        height: 20px;
    }
    
    .page-home .matrix-label {
        font-size: var(--font-size-xs);
        letter-spacing: 0.05em;
    }
    
    .page-home .matrix-number {
        font-size: clamp(1.75rem, 5vw, 2rem);
    }
    
    .page-home .matrix-unit {
        font-size: var(--font-size-base);
    }
    
    .page-home .controls {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .page-home .btn-primary, .btn-secondary {
        width: 100%;
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .page-home .footer-info-grid {
        grid-template-columns: 1fr !important;
        gap: var(--spacing-md) !important;
    }
    
    .page-home .info-card {
        padding: var(--spacing-md) !important;
    }
    
    .page-home .settings-panel {
        max-width: 100% !important;
    }
    
    .page-home .settings-toggle {
        width: 2.5rem !important;
        height: 2.5rem !important;
        top: var(--spacing-md) !important;
        right: var(--spacing-md) !important;
    }
}

/* ===== Utility Classes ===== */
[hidden] {
    display: none !important;
}

.page-home .sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ========================================
   LEARN & 404 PAGE SPECIFIC STYLES
   (Scoped to prevent homepage interference)
   ======================================== */

/* ===== LEARN PAGE STYLES ===== */

/* Force body background for learn page */
body.page-learn {
    background: var(--color-bg-primary);
}

/* Header with Hamburger (Learn page) */
.page-learn header {
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.page-learn .header-container {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    padding: 1rem 1.5rem;
    gap: 1rem;
}

/* Hamburger Menu Button */
.page-learn .sidebar-toggle {
    background: transparent;
    border: none;
    color: var(--color-text-primary);
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: all 0.2s;
}

.page-learn .sidebar-toggle:hover {
    background: var(--color-bg-elevated);
    color: var(--color-primary);
}

.page-learn .sidebar-toggle i {
    width: 1.5rem;
    height: 1.5rem;
}

/* Logo (Center) */
.page-learn .logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    color: var(--color-text-primary);
    font-weight: 600;
    font-size: 1.125rem;
}

.page-learn .logo i {
    width: 1.5rem;
    height: 1.5rem;
    color: var(--color-primary) !important;
    stroke: var(--color-primary) !important;
    fill: none !important;
    filter: drop-shadow(0 0 8px var(--color-primary-glow));
}

/* Theme Toggle (Right) */
.page-learn .theme-toggle-inline {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
    padding: 0.5rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.page-learn .theme-toggle-inline:hover {
    background: var(--color-bg-elevated);
    border-color: var(--color-primary);
}

.page-learn .theme-toggle-inline i {
    width: 1.25rem;
    height: 1.25rem;
}

/* Sidebar Overlay */
.page-learn .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 90;
    opacity: 0;
    transition: opacity 0.3s;
}

.page-learn .sidebar-overlay.active {
    display: block;
    opacity: 1;
}

/* Sidebar */
.page-learn .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 280px;
    background: var(--color-bg-secondary);
    border-right: 1px solid var(--color-border);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 95;
    overflow-y: auto;
    padding-top: 4rem;
}

.page-learn .sidebar.active {
    transform: translateX(0);
}

.page-learn .sidebar-nav {
    padding: 1.5rem 0;
}

.page-learn .sidebar-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    color: var(--color-text-secondary);
    text-decoration: none !important;
    transition: all 0.2s;
    border-left: 3px solid transparent;
    font-weight: 500;
}

.page-learn .sidebar-link:hover {
    background: var(--color-bg-elevated);
    color: var(--color-primary);
    text-decoration: none !important;
}

.page-learn .sidebar-link.active {
    background: var(--color-bg-elevated);
    color: var(--color-primary);
    border-left-color: var(--color-primary);
    text-decoration: none !important;
}

.page-learn .sidebar-link i {
    width: 1.25rem;
    height: 1.25rem;
    flex-shrink: 0;
}

/* Main Content */
.page-learn .main-content {
    padding: 0;
    background: var(--color-bg-primary);
}

/* Content Sections (Show/Hide) */
.page-learn .content-section {
    display: none;
}

.page-learn .content-section.active {
    display: block;
}

.page-learn .section-inner {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
}

.page-learn h1 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text-primary);
    margin-bottom: 1rem;
}

.page-learn h2 {
    font-size: clamp(1.5rem, 3.5vw, 1.875rem);
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text-primary);
    margin-bottom: 1.5rem;
    margin-top: 3rem;
}

.page-learn h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    line-height: 1.4;
    color: var(--color-text-primary);
    margin-top: 2rem;
    margin-bottom: 0.875rem;
}

.page-learn h4 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    line-height: 1.4;
    color: var(--color-text-primary);
    margin-bottom: 0.75rem;
}

.page-learn p {
    margin-bottom: 1rem;
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    line-height: 1.7;
}

.page-learn strong {
    color: var(--color-text-primary);
    font-weight: 600;
}

.page-learn ul, 
.page-learn ol {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
    color: var(--color-text-secondary);
}

.page-learn li {
    margin-bottom: 0.5rem;
    padding-left: 0.5rem;
    line-height: 1.6;
}

.page-learn a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.page-learn a:hover {
    color: var(--color-primary-hover);
    text-decoration: underline;
}

/* Hero Section (Learn page) */
.page-learn .hero {
    text-align: center;
    margin-bottom: 4rem;
}

.page-learn .hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--color-primary), var(--color-success));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-learn .hero p {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Comparison Grid */
.page-learn .comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.page-learn .comparison-card {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    transition: border-color 0.2s ease;
}

.page-learn .comparison-card:hover {
    border-color: var(--color-primary);
}

.page-learn .comparison-card h4 {
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
    color: var(--color-text-primary);
    font-weight: 600;
}

.page-learn .comparison-card .tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

.page-learn .tag.local {
    background: var(--color-warning);
    color: white;
}

.page-learn .tag.global {
    background: var(--color-success);
    color: white;
}

/* Example Box */
.page-learn .example-box {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-left: 3px solid var(--color-primary);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.page-learn .example-box h4 {
    color: var(--color-text-primary);
    margin-bottom: 0.75rem;
    font-size: 1.125rem;
    font-weight: 600;
}

.page-learn .example-box .speed-comparison {
    display: flex;
    justify-content: space-around;
    margin-top: 1rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.page-learn .speed-stat {
    text-align: center;
}

.page-learn .speed-stat .value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text-primary);
}

.page-learn .speed-stat .label {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    margin-top: 0.25rem;
}

/* Info Box */
.page-learn .info-box {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    margin: 1.5rem 0;
    border-left: 3px solid var(--color-info);
}

.page-learn .info-box.tip {
    border-left-color: var(--color-success);
}

.page-learn .info-box.warning {
    border-left-color: var(--color-warning);
}

.page-learn .info-box strong {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    font-weight: 600;
}

/* Glossary */
.page-learn .glossary-grid {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    max-width: 800px;
}

.page-learn .glossary-item {
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-border);
}

.page-learn .glossary-item:last-child {
    border-bottom: none;
}

.page-learn .glossary-item dt {
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--color-text-primary);
    margin-bottom: 0.5rem;
}

.page-learn .glossary-item dd {
    color: var(--color-text-secondary);
    line-height: 1.7;
    font-size: var(--font-size-base);
}

/* CTA Section */
.page-learn .cta-section {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2.5rem 2rem;
    text-align: center;
    margin: 3rem auto;
    max-width: 900px;
}

.page-learn .cta-section h2 {
    color: var(--color-text-primary);
    margin-bottom: 0.75rem;
    margin-top: 0;
    font-size: var(--font-size-2xl);
}

.page-learn .cta-section p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    margin-bottom: 1.5rem;
}

.page-learn .cta-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--color-primary);
    color: white !important;
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-md);
    text-decoration: none !important;
    font-weight: 600;
    transition: background-color 0.2s ease;
    position: relative;
    z-index: 1;
}

.page-learn .cta-button:hover {
    background: var(--color-primary-hover);
}

.page-learn .cta-button i {
    width: 1.125rem;
    height: 1.125rem;
}

/* Footer (Learn page) */
.page-learn footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: 2rem 0;
    text-align: center;
    color: var(--color-text-tertiary);
    font-size: 0.875rem;
    margin-top: 4rem;
}

.page-learn footer a {
    color: var(--color-primary);
    text-decoration: none;
}

.page-learn footer a:hover {
    text-decoration: underline;
}

/* Hero Section (Learn page) */
.page-learn .hero {
    text-align: center;
    margin-bottom: 2rem;
    padding: 3rem 2rem 2rem;
    border-bottom: 1px solid var(--color-border);
}

.page-learn .hero h1 {
    font-size: clamp(1.875rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--color-text-primary);
    letter-spacing: -0.01em;
}

.page-learn .hero p {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 650px;
    margin: 0 auto;
    line-height: 1.6;
    font-weight: 400;
}



/* Blockquote Style for Examples */
.page-learn .article-quote {
    border-left: 4px solid var(--color-primary);
    padding: 1.25rem 1.5rem;
    margin: 1.5rem 0;
    background: var(--color-bg-elevated);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-style: italic;
}

.page-learn .article-quote p {
    margin: 0;
}

.page-learn .article-quote strong {
    color: var(--color-primary);
    font-style: normal;
}

/* Links Styling */
.page-learn a {
    color: var(--color-primary);
    text-decoration: underline;
    text-decoration-color: transparent;
    text-underline-offset: 3px;
    transition: text-decoration-color 0.2s ease;
}

.page-learn a:hover {
    text-decoration-color: var(--color-primary);
}

/* Glossary Intro */
.page-learn .glossary-intro {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: 2rem;
    font-style: italic;
}

/* Theme Toggle Inline Style (matching homepage) */
.page-learn nav .theme-toggle-inline {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s;
    font-size: var(--font-size-sm);
}

.page-learn nav .theme-toggle-inline .theme-icon {
    width: 1.125rem;
    height: 1.125rem;
    transition: transform 0.3s ease;
}

.page-learn nav .theme-toggle-inline:hover {
    background: var(--color-bg-secondary);
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.page-learn nav .theme-toggle-inline:hover .theme-icon {
    transform: rotate(15deg);
}

/* Light mode - show moon icon (to switch to dark) */
[data-theme="light"] .page-learn .theme-icon {
    color: #64748b;
    filter: drop-shadow(0 0 4px rgba(100, 116, 139, 0.3));
}

/* Dark mode - show sun icon (to switch to light) */
[data-theme="dark"] .page-learn .theme-icon {
    color: #fbbf24;
    filter: drop-shadow(0 0 8px rgba(251, 191, 36, 0.6));
}

/* Responsive Design */
@media (max-width: 768px) {
    .page-learn .header-container {
        padding: 0 1rem;
    }
    
    .page-learn nav {
        gap: 1rem;
    }
    
    .page-learn nav a {
        display: none;
    }
    
    .page-learn nav a.active {
        display: block;
    }
    
    .page-learn main {
        padding: 2rem 1rem;
    }
    
    .page-learn .hero h1 {
        font-size: var(--font-size-3xl);
    }
    
    .page-learn .tab-button {
        padding: 0.75rem 1rem;
        font-size: var(--font-size-sm);
        flex: 1;
        justify-content: center;
    }
    
    .page-learn .tab-button span {
        display: none;
    }
    
    .page-learn .tab-button i {
        width: 1.25rem;
        height: 1.25rem;
    }
    
    .page-learn .comparison-grid {
        grid-template-columns: 1fr;
    }
    
    .page-learn .glossary-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== 404 PAGE STYLES ===== */

/* Force body background for 404 page */
body.page-404 {
    background: var(--color-bg-primary);
}

/* Standalone Theme Toggle (404 page) */
.page-404 .theme-toggle {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 1000;
    width: 3rem;
    height: 3rem;
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border);
    background: var(--color-bg-elevated);
    color: var(--color-text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.page-404 .theme-toggle:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

/* 404 Page Layout */
.page-404 {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.page-404 .error-container {
    max-width: 700px;
    width: 100%;
    margin: 0 auto;
    text-align: center;
}

/* 404 Number */
.page-404 .error-code {
    font-size: clamp(6rem, 15vw, 12rem);
    font-weight: 900;
    background: linear-gradient(135deg, var(--color-primary), var(--color-success));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 1rem;
    animation: pulse-404 3s ease-in-out infinite;
}

@keyframes pulse-404 {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* 404 Icon */
.page-404 .error-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 2rem;
    color: var(--color-primary);
    animation: float-404 3s ease-in-out infinite;
}

@keyframes float-404 {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* 404 Page Text */
.page-404 h1 {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--color-text-primary);
}

.page-404 p {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--color-text-secondary);
    margin-bottom: 2rem;
    line-height: 1.6;
}

/* Speed Fact Box */
.page-404 .speed-fact {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-left: 4px solid var(--color-primary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin: 2rem 0;
    text-align: left;
}

.page-404 .speed-fact strong {
    display: block;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
    font-size: 1.125rem;
}

.page-404 .speed-fact p {
    margin: 0;
    font-size: 1rem;
    color: var(--color-text-secondary);
}

/* Navigation Buttons */
.page-404 .nav-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

.page-404 .btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s;
    font-size: 1rem;
}

.page-404 .btn-primary {
    background: var(--color-primary);
    color: white;
}

.page-404 .btn-primary:hover {
    background: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.3);
}

.page-404 .btn-secondary {
    background: var(--color-bg-elevated);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.page-404 .btn-secondary:hover {
    background: var(--color-bg-secondary);
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

/* Quick Links */
.page-404 .quick-links {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
}

.page-404 .quick-links h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--color-text-primary);
}

.page-404 .links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.page-404 .link-item {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1rem;
    text-decoration: none;
    color: var(--color-text-primary);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.page-404 .link-item:hover {
    background: var(--color-bg-secondary);
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.page-404 .link-item svg,
.page-404 .link-item i {
    width: 20px;
    height: 20px;
    color: var(--color-primary);
    flex-shrink: 0;
}

.page-404 .link-item span {
    font-size: 0.9375rem;
    font-weight: 500;
}

/* ===== RESPONSIVE STYLES (Learn & 404 pages) ===== */

/* Tablet styles (medium screens) */
@media (min-width: 769px) and (max-width: 1024px) {
    .page-learn .section-inner {
        max-width: 700px;
        padding: 2rem 1.5rem;
    }
    
    .page-learn .hero {
        padding: 2.5rem 1.5rem;
    }
    
    .page-learn .cta-section {
        max-width: 700px;
        padding: 2rem 1.5rem;
    }
    
    .page-learn .comparison-grid {
        grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    }
}

/* Small tablets (601px - 768px) */
@media (min-width: 601px) and (max-width: 768px) {
    .page-learn .section-inner {
        max-width: 600px;
        padding: 1.75rem 1.5rem;
    }
    
    .page-learn .hero {
        padding: 2.25rem 1.5rem;
    }
    
    .page-learn .cta-section {
        max-width: 600px;
        padding: 2rem 1.5rem;
    }
    
    .page-learn .comparison-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .page-learn .header-container {
        padding: 1rem 1.5rem;
    }
}

/* Mobile styles (max 600px) */
@media (max-width: 600px) {
    /* Learn page responsive */
    .page-learn .section-inner {
        padding: 1.5rem 1rem;
    }
    
    .page-learn .comparison-grid {
        grid-template-columns: 1fr;
    }
    
    .page-learn .cta-section {
        padding: 2rem 1rem;
    }
    
    .page-learn .hero {
        padding: 2rem 1rem;
    }
    
    .page-learn .header-container {
        padding: 1rem;
    }
    
    .page-learn .sidebar {
        width: 280px;
    }
    
    /* 404 page responsive */
    .page-404 .error-code {
        font-size: 5rem;
    }
    
    .page-404 .error-icon {
        width: 60px;
        height: 60px;
    }
    
    .page-404 .btn {
        width: 100%;
        justify-content: center;
    }
    
    .page-404 .links-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   PERFORMANCE WARNING
   ======================================== */

.performance-warning {
    position: fixed;
    top: 20px;
    right: 20px;
    background: rgba(255, 152, 0, 0.95);
    color: white;
    padding: 12px 20px;
    border-radius: 8px;
    font-size: 14px;
    z-index: 9999;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    animation: slideInRight 0.3s ease;
}

.performance-warning.hiding {
    animation: slideOutRight 0.3s ease;
}

@keyframes slideInRight {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOutRight {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(400px);
        opacity: 0;
    }
}