/* ===== CSS VARIABLES ===== */
:root {
    /* Arabic font stack */
    --font-arabic: 'Noto Sans Arabic', 'Tahoma', 'Arial Unicode MS', sans-serif;
    /* Colors inspired by technical documentation */
    --primary-color: #1a365d;
    --secondary-color: #2c5282;
    --accent-color: #3182ce;
    --light-blue: #ebf8ff;
    --success-color: #38a169;
    --warning-color: #d69e2e;
    --danger-color: #e53e3e;
    
    /* Neutral colors */
    --white: #ffffff;
    --gray-50: #f7fafc;
    --gray-100: #edf2f7;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e0;
    --gray-400: #a0aec0;
    --gray-500: #718096;
    --gray-600: #4a5568;
    --gray-700: #2d3748;
    --gray-800: #1a202c;
    --gray-900: #171923;
    
    /* Sensor category colors */
    --light-sensor: #4299e1;
    --eddy-sensor: #38b2ac;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Consolas', 'Monaco', monospace;
    
    /* 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;
    
    /* Borders */
    --border-radius-sm: 0.375rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-width: 1px;
    
    /* 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), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--gray-50);
}

/* ===== UTILITY CLASSES ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Desktop container improvements */
@media (min-width: 1024px) {
    .container {
        max-width: 1400px;
        padding: 0 var(--spacing-xl);
    }
}

@media (min-width: 1440px) {
    .container {
        max-width: 1600px;
        padding: 0 var(--spacing-2xl);
    }
}

.section {
    padding: var(--spacing-3xl) 0;
}

/* Desktop section improvements */
@media (min-width: 1024px) {
    .section {
        padding: 5rem 0;
    }
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--border-radius-md);
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-normal);
    border: var(--border-width) solid transparent;
    cursor: pointer;
    font-size: 0.95rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background-color: var(--secondary-color);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Special styling for Start Learning button */
.btn-start-learning {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 50%, var(--accent-color) 100%);
    border: 2px solid transparent;
    color: var(--white);
    font-weight: 700;
    position: relative;
    overflow: hidden;
    box-shadow: 
        0 6px 20px rgba(26, 54, 93, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.2),
        inset 0 -1px 0 rgba(0, 0, 0, 0.1);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.btn-start-learning::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left 0.7s ease;
}

.btn-start-learning:hover::before {
    left: 100%;
}

.btn-start-learning::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.3) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    transition: all 0.3s ease;
    border-radius: 50%;
}

.btn-start-learning:hover::after {
    width: 200px;
    height: 200px;
}

.btn-start-learning:hover {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--accent-color) 50%, #4299e1 100%);
    transform: translateY(-4px);
    box-shadow: 
        0 15px 35px rgba(26, 54, 93, 0.4),
        0 5px 15px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.btn-start-learning i {
    margin-right: var(--spacing-xs);
    font-size: 1.2em;
    transition: all var(--transition-normal);
}

.btn-start-learning:hover i {
    transform: scale(1.2) rotate(5deg);
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

/* Pulsing glow animation for Start Learning button */
.btn-start-learning {
    animation: primary-glow 4s ease-in-out infinite;
}

@keyframes primary-glow {
    0%, 100% {
        box-shadow: 
            0 6px 20px rgba(26, 54, 93, 0.3),
            inset 0 1px 0 rgba(255, 255, 255, 0.2),
            inset 0 -1px 0 rgba(0, 0, 0, 0.1);
    }
    50% {
        box-shadow: 
            0 8px 25px rgba(26, 54, 93, 0.4),
            0 0 0 4px rgba(66, 153, 225, 0.15),
            inset 0 1px 0 rgba(255, 255, 255, 0.3),
            inset 0 -1px 0 rgba(0, 0, 0, 0.1);
    }
}

/* Enhanced focus state for accessibility */
.btn-start-learning:focus {
    outline: none;
    box-shadow: 
        0 6px 20px rgba(26, 54, 93, 0.3),
        0 0 0 4px rgba(66, 153, 225, 0.6),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

/* Active state for immediate feedback */
.btn-start-learning:active {
    transform: translateY(-2px);
    box-shadow: 
        0 4px 15px rgba(26, 54, 93, 0.4),
        inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background-color: transparent;
    color: var(--white);
    border-color: var(--white);
    position: relative;
    overflow: hidden;
}

.btn-secondary:hover {
    background-color: var(--white);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 255, 255, 0.3);
}

/* Special styling for View Contents button */
.btn-view-contents {
    background: 
        linear-gradient(45deg, rgba(255, 255, 255, 0.25), rgba(255, 255, 255, 0.15)),
        radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.1), transparent 50%);
    border: 2px solid var(--white);
    color: var(--white);
    font-weight: 600;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(15px);
    box-shadow: 
        0 4px 15px rgba(255, 255, 255, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.4),
        inset 0 -1px 0 rgba(255, 255, 255, 0.1);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.btn-view-contents::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.6s ease;
}

.btn-view-contents:hover::before {
    left: 100%;
}

.btn-view-contents:hover {
    background: var(--white);
    color: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: 
        0 12px 30px rgba(255, 255, 255, 0.4),
        0 4px 15px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(26, 54, 93, 0.1);
    border-color: var(--white);
    cursor: pointer;
    text-shadow: none;
}

.btn-view-contents i {
    margin-right: var(--spacing-xs);
    font-size: 1.1em;
    transition: transform var(--transition-fast);
}

.btn-view-contents:hover i {
    transform: scale(1.2);
}

/* Subtle pulse animation for View Contents button */
.btn-view-contents {
    animation: subtle-pulse 3s ease-in-out infinite;
}

@keyframes subtle-pulse {
    0%, 100% {
        box-shadow: 
            0 4px 15px rgba(255, 255, 255, 0.2),
            inset 0 1px 0 rgba(255, 255, 255, 0.3);
    }
    50% {
        box-shadow: 
            0 4px 20px rgba(255, 255, 255, 0.3),
            inset 0 1px 0 rgba(255, 255, 255, 0.4),
            0 0 0 3px rgba(255, 255, 255, 0.1);
    }
}

/* Enhanced focus state for accessibility */
.btn-view-contents:focus {
    outline: none;
    box-shadow: 
        0 4px 15px rgba(255, 255, 255, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.3),
        0 0 0 3px rgba(255, 255, 255, 0.5);
}

/* ===== LANGUAGE SWITCHER ===== */
.language-switcher {
    position: relative;
    margin-left: var(--spacing-md);
}

/* Desktop language switcher improvements */
@media (min-width: 1024px) {
    .language-switcher {
        margin-left: var(--spacing-xl);
    }
    
    .lang-btn {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: 1rem;
    }
    
    .lang-dropdown {
        min-width: 160px;
    }
    
    .lang-option {
        padding: var(--spacing-lg);
        font-size: 1rem;
    }
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--white);
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius-md);
    color: var(--gray-700);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.9rem;
    font-weight: 500;
}

.lang-btn:hover {
    background-color: var(--gray-50);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.lang-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 140px;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-normal);
}

.lang-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-md);
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    transition: background-color var(--transition-fast);
    font-size: 0.9rem;
}

.lang-option:hover {
    background-color: var(--gray-50);
}

.lang-option:first-child {
    border-radius: var(--border-radius-md) var(--border-radius-md) 0 0;
}

.lang-option:last-child {
    border-radius: 0 0 var(--border-radius-md) var(--border-radius-md);
}

/* ===== RTL SUPPORT ===== */
[dir="rtl"] {
    text-align: right;
}

[dir="rtl"] body {
    font-family: var(--font-arabic);
    direction: rtl;
}

[dir="rtl"] .nav-container {
    flex-direction: row-reverse;
}

[dir="rtl"] .nav-menu {
    flex-direction: row-reverse;
}

[dir="rtl"] .nav-brand {
    flex-direction: row-reverse;
}

[dir="rtl"] .hero-buttons {
    justify-content: flex-end;
}



[dir="rtl"] .toc-link {
    flex-direction: row-reverse;
    text-align: right;
    border-left: none;
    border-right: 4px solid transparent;
}

[dir="rtl"] .toc-link:hover {
    border-right-color: var(--primary-color);
    border-left-color: transparent;
    transform: translateX(-4px);
}

[dir="rtl"] .info-box li {
    padding-right: var(--spacing-lg);
    padding-left: 0;
}

[dir="rtl"] .info-box li:before {
    right: 0;
    left: auto;
}

[dir="rtl"] .features-grid,
[dir="rtl"] .advantages-grid,
[dir="rtl"] .app-grid {
    direction: rtl;
}

[dir="rtl"] .step {
    flex-direction: row-reverse;
}

[dir="rtl"] .advantage-item,
[dir="rtl"] .app-item {
    flex-direction: row-reverse;
}

[dir="rtl"] .precision-item {
    flex-direction: row-reverse;
}

[dir="rtl"] .card-content li {
    padding-right: var(--spacing-lg);
    padding-left: 0;
}

[dir="rtl"] .card-content li:before {
    right: 0;
    left: auto;
}

[dir="rtl"] .lang-dropdown {
    left: 0;
    right: auto;
}

/* ===== FLOATING LANGUAGE BUTTON (MOBILE) ===== */
.floating-lang-btn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 56px;
    height: 56px;
    background: var(--primary-color);
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.floating-lang-btn:hover {
    background: var(--secondary-color);
    transform: scale(1.1);
}

@media (max-width: 768px) {
    .floating-lang-btn {
        display: flex;
    }
    
    .language-switcher {
        display: block !important;
    }
}

/* Ensure floating button is hidden on desktop */
@media (min-width: 1024px) {
    .floating-lang-btn {
        display: none !important;
    }
    
    .language-switcher {
        display: block;
    }
}

[dir="rtl"] .language-switcher {
    margin-right: var(--spacing-md);
    margin-left: 0;
}

/* Arabic Typography Improvements */
[dir="rtl"] h1, [dir="rtl"] h2, [dir="rtl"] h3, [dir="rtl"] h4, [dir="rtl"] h5, [dir="rtl"] h6 {
    font-family: var(--font-arabic);
    font-weight: 600;
    line-height: 1.4;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

[dir="rtl"] p, [dir="rtl"] li, [dir="rtl"] span {
    font-family: var(--font-arabic);
    line-height: 1.7;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

[dir="rtl"] .nav-link {
    font-family: var(--font-arabic);
}

[dir="rtl"] .btn {
    font-family: var(--font-arabic);
    text-rendering: optimizeLegibility;
}

/* Arabic Mobile Text Optimization */
@media (max-width: 768px) {
    [dir="rtl"] .hero-text h1 {
        text-shadow: 0 2px 4px rgba(0,0,0,0.1);
        word-break: normal;
        overflow-wrap: break-word;
    }
    
    [dir="rtl"] .hero-description {
        text-shadow: 0 1px 2px rgba(0,0,0,0.1);
        max-width: 100%;
        margin-left: auto;
        margin-right: auto;
    }
    
    [dir="rtl"] .btn span {
        display: inline-block;
        text-align: center;
    }
}

/* ===== NAVIGATION ===== */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-xl);
    max-width: 1400px;
    margin: 0 auto;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    font-size: 1.25rem;
    color: var(--primary-color);
}

.nav-brand i {
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

/* Desktop navigation enhancements */
@media (min-width: 1024px) {
    .nav-menu {
        gap: 2.5rem;
    }
    
    .nav-link {
        font-size: 1.1rem;
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .nav-brand {
        font-size: 1.5rem;
    }
    
    .nav-brand i {
        font-size: 2rem;
    }
}

.nav-link {
    color: var(--gray-600);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    background-color: var(--light-blue);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: var(--gray-600);
    margin: 3px 0;
    transition: var(--transition-fast);
}

/* ===== HERO SECTION ===== */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: var(--spacing-3xl) var(--spacing-md);
    margin-top: 80px;
    min-height: 80vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-bg-svg {
    width: 100%;
    height: 100%;
}

.circuit-pattern {
    animation: circuitFlow 8s ease-in-out infinite;
}

@keyframes circuitFlow {
    0%, 100% { opacity: 0.1; }
    50% { opacity: 0.3; }
}

.wave-line {
    filter: drop-shadow(0 0 10px rgba(66, 153, 225, 0.3));
}

.hero-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    position: relative;
    z-index: 2;
}

.hero-text {
    padding: var(--spacing-lg);
}

.hero-text h1 {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    line-height: 1.1;
}

/* Desktop-specific hero text styling */
@media (min-width: 1024px) {
    .hero-text h1 {
        font-size: 4.5rem;
        margin-bottom: var(--spacing-xl);
    }
    
    .hero-text {
        padding: var(--spacing-xl) 0;
    }
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
    font-weight: 300;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.8;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    position: relative;
}

/* Subtle connecting line between buttons on desktop */
@media (min-width: 769px) {
    .hero-buttons::before {
        content: '';
        position: absolute;
        top: 50%;
        left: 50%;
        width: 1px;
        height: 20px;
        background: linear-gradient(to bottom, transparent, rgba(255, 255, 255, 0.3), transparent);
        transform: translateX(-50%);
        opacity: 0.6;
    }
}

/* Enhanced button container for better spacing */
.hero-buttons .btn {
    position: relative;
    z-index: 2;
}

/* Staggered entrance animation for buttons */
.btn-start-learning {
    animation-delay: 0.2s;
}

.btn-view-contents {
    animation-delay: 0.4s;
}

/* Button entrance animation */
@keyframes buttonEntrance {
    0% {
        opacity: 0;
        transform: translateY(20px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.loaded .btn-start-learning,
.loaded .btn-view-contents {
    animation: buttonEntrance 0.8s ease-out forwards;
}

/* Desktop button improvements */
@media (min-width: 1024px) {
    .hero-buttons {
        gap: var(--spacing-lg);
        margin-top: var(--spacing-xl);
    }
    
    .btn {
        padding: var(--spacing-lg) 2.5rem;
        font-size: 1.1rem;
        font-weight: 600;
    }
    
    .btn:hover {
        transform: translateY(-3px);
    }
    
    /* Desktop enhancements for View Contents button */
    .btn-view-contents {
        font-size: 1.2rem;
        min-width: 220px;
    }
    
    .btn-view-contents:hover {
        transform: translateY(-4px) scale(1.02);
    }
    
    /* Desktop enhancements for Start Learning button */
    .btn-start-learning {
        font-size: 1.3rem;
        min-width: 240px;
        font-weight: 700;
    }
    
    .btn-start-learning:hover {
        transform: translateY(-5px) scale(1.03);
    }
}

.sensor-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.sensor-icon {
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.sensor-icon:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-5px);
}

.sensor-icon i {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    display: block;
}

.sensor-icon span {
    font-weight: 500;
    font-size: 0.9rem;
}

/* ===== SENSOR CONCEPT DIAGRAM ===== */
.sensor-concept-diagram {
    width: 100%;
    max-width: 300px;
    margin: 0 auto var(--spacing-xl);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Desktop concept diagram improvements */
@media (min-width: 1024px) {
    .sensor-concept-diagram {
        max-width: 400px;
        padding: 2rem;
        margin-bottom: 2.5rem;
    }
    
    .sensor-grid {
        gap: 2rem;
    }
    
    .sensor-icon {
        padding: 2rem;
        min-height: 140px;
    }
    
    .sensor-icon i {
        font-size: 3rem;
        margin-bottom: var(--spacing-lg);
    }
    
    .sensor-icon span {
        font-size: 1.1rem;
    }
}

.concept-svg {
    width: 100%;
    height: auto;
}

.pulse-animation {
    animation: pulse-glow 3s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% {
        opacity: 0.6;
        transform: scale(1);
    }
    50% {
        opacity: 1;
        transform: scale(1.05);
    }
}

.detection-beam {
    animation: beam-flow 4s ease-in-out infinite;
}

@keyframes beam-flow {
    0%, 100% {
        opacity: 0.7;
    }
    50% {
        opacity: 0.3;
    }
}

/* ===== DETECTION DIAGRAMS ===== */
.detection-diagram {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.05));
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    margin: var(--spacing-lg) 0;
    backdrop-filter: blur(10px);
}

/* Desktop diagram improvements */
@media (min-width: 1024px) {
    .detection-diagram,
    .eddy-current-diagram,
    .rgb-analysis-diagram {
        padding: 3rem;
        margin: 2.5rem 0;
    }
    
    .diagram-svg {
        max-width: 700px;
    }
}

.diagram-svg {
    width: 100%;
    max-width: 500px;
    height: auto;
    display: block;
    margin: 0 auto;
}

.animated-beam {
    filter: drop-shadow(0 0 5px currentColor);
}

.moving-object {
    filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.3));
}

.diffuse-rays {
    animation: diffuse-pulse 3s ease-in-out infinite;
}

@keyframes diffuse-pulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 0.9; }
}

/* Interactive hover effects for diagrams */
.detection-diagram:hover .animated-beam {
    animation-duration: 0.8s;
}

.detection-diagram:hover .moving-object {
    animation-duration: 2s;
}

/* ===== EDDY CURRENT DIAGRAM ===== */
.eddy-current-diagram {
    background: linear-gradient(135deg, rgba(56, 178, 172, 0.1), rgba(56, 178, 172, 0.05));
    border: 1px solid rgba(56, 178, 172, 0.3);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    margin: var(--spacing-lg) 0;
    backdrop-filter: blur(10px);
}

.em-field {
    filter: drop-shadow(0 0 10px rgba(56, 178, 172, 0.3));
}

.eddy-currents {
    filter: drop-shadow(0 0 5px rgba(229, 62, 62, 0.5));
}

.metal-object {
    filter: drop-shadow(2px 2px 5px rgba(0,0,0,0.3));
}

/* Interactive hover for eddy diagram */
.eddy-current-diagram:hover .eddy-currents circle {
    animation-duration: 1s !important;
}

.eddy-current-diagram:hover .em-field {
    animation-duration: 1.5s !important;
}

/* ===== RGB ANALYSIS DIAGRAM ===== */
.rgb-analysis-diagram {
    background: linear-gradient(135deg, rgba(66, 153, 225, 0.1), rgba(66, 153, 225, 0.05));
    border: 1px solid rgba(66, 153, 225, 0.3);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    margin: var(--spacing-lg) 0;
    backdrop-filter: blur(10px);
}

.rgb-beams {
    filter: drop-shadow(0 0 8px rgba(66, 153, 225, 0.4));
}

.reflected-analysis {
    filter: drop-shadow(0 0 5px rgba(255, 255, 255, 0.3));
}

/* Interactive hover for RGB diagram */
.rgb-analysis-diagram:hover .rgb-beams path {
    animation-duration: 1s !important;
}

.rgb-analysis-diagram:hover .reflected-analysis path {
    animation-duration: 1s !important;
}

/* ===== SECTION TITLES ===== */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    color: var(--primary-color);
    position: relative;
}

/* Desktop typography improvements */
@media (min-width: 1024px) {
    .section-title {
        font-size: 3.5rem;
        margin-bottom: 4rem;
    }
    
    .content-header h2 {
        font-size: 3rem;
    }
    
    .sensor-header h2 {
        font-size: 3rem;
    }
    
    .hero-subtitle {
        font-size: 1.8rem;
        margin-bottom: var(--spacing-xl);
    }
    
    .hero-description {
        font-size: 1.3rem;
        line-height: 1.8;
    }
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.content-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.content-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--gray-600);
    font-weight: 300;
}

/* ===== TABLE OF CONTENTS ===== */
.toc-section {
    background-color: var(--white);
}

.toc-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

/* Desktop TOC improvements */
@media (min-width: 1024px) {
    .toc-grid {
        gap: 3rem;
        grid-template-columns: 1fr 1fr;
    }
    
    .toc-item {
        padding: 2.5rem;
    }
    
    .toc-link {
        padding: var(--spacing-lg);
        font-size: 1.1rem;
    }
}

.toc-item {
    background-color: var(--gray-50);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.toc-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.toc-header h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--gray-800);
}

.number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    background-color: var(--primary-color);
    color: var(--white);
    border-radius: 50%;
    font-size: 1.1rem;
    font-weight: 600;
    margin-right: var(--spacing-md);
}

.toc-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toc-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--white);
    border-radius: var(--border-radius-md);
    text-decoration: none;
    color: var(--gray-700);
    transition: all var(--transition-fast);
    border-left: 4px solid transparent;
}

.toc-link:hover {
    border-left-color: var(--primary-color);
    background-color: var(--light-blue);
    color: var(--primary-color);
    transform: translateX(4px);
}

.toc-link i {
    font-size: 1.2rem;
    width: 1.5rem;
    text-align: center;
}

.toc-link span {
    flex: 1;
    font-weight: 500;
}

.toc-link small {
    color: var(--gray-500);
    font-weight: 400;
}

/* ===== CONTENT SECTIONS ===== */
.content-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

/* Desktop content grid improvements */
@media (min-width: 1024px) {
    .content-grid {
        gap: 4rem;
        grid-template-columns: 1.8fr 1fr;
    }
}

.content-text p {
    margin-bottom: var(--spacing-lg);
    font-size: 1.1rem;
    line-height: 1.7;
}

.info-box {
    background-color: var(--light-blue);
    border: 1px solid var(--accent-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.info-box h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.info-box ul {
    list-style: none;
    padding-left: 0;
}

.info-box li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
}

.info-box li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

/* ===== SENSOR SECTIONS ===== */
.sensor-section {
    background-color: var(--white);
    position: relative;
}

.sensor-section:nth-child(even) {
    background-color: var(--gray-50);
}

.sensor-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.03;
    background-image: 
        radial-gradient(circle at 25% 25%, var(--primary-color) 1px, transparent 1px),
        radial-gradient(circle at 75% 75%, var(--secondary-color) 1px, transparent 1px);
    background-size: 50px 50px;
    background-position: 0 0, 25px 25px;
    pointer-events: none;
}

.sensor-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.sensor-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

.sensor-badge.light {
    background-color: var(--light-blue);
    color: var(--light-sensor);
}

.sensor-badge.eddy {
    background-color: #e6fffa;
    color: var(--eddy-sensor);
}

.sensor-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.sensor-subtitle {
    font-size: 1.2rem;
    color: var(--gray-600);
    font-weight: 300;
}

.sensor-overview h3 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--gray-800);
}

.sensor-overview p {
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-xl);
    color: var(--gray-700);
}

/* ===== FEATURES GRID ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

/* Desktop grid improvements */
@media (min-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 2rem;
    }
    
    .feature-item {
        padding: 2rem;
    }
    
    .feature-item i {
        font-size: 3rem;
        margin-bottom: var(--spacing-lg);
    }
    
    .feature-item h4 {
        font-size: 1.3rem;
        margin-bottom: var(--spacing-md);
    }
}

.feature-item {
    text-align: center;
    padding: var(--spacing-lg);
    background-color: var(--gray-50);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-normal);
}

.feature-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.feature-item i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.feature-item h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--gray-800);
}

.feature-item p {
    color: var(--gray-600);
    font-size: 0.95rem;
}

/* ===== TABS ===== */
.method-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--gray-200);
}

/* Desktop tab improvements */
@media (min-width: 1024px) {
    .method-tabs {
        gap: var(--spacing-md);
        margin-bottom: 2rem;
    }
    
    .tab-btn {
        padding: var(--spacing-lg) 2rem;
        font-size: 1.1rem;
    }
    
    .method-info {
        padding: 2rem 0;
    }
    
    .method-info h4 {
        font-size: 1.5rem;
        margin-bottom: var(--spacing-lg);
    }
    
    .method-info p {
        font-size: 1.2rem;
        margin-bottom: 2rem;
    }
    
    .method-features {
        gap: var(--spacing-md);
    }
    
    .feature-tag {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: 0.95rem;
    }
}

.tab-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    background: none;
    border: none;
    font-size: 1rem;
    font-weight: 500;
    color: var(--gray-600);
    cursor: pointer;
    border-radius: var(--border-radius-sm) var(--border-radius-sm) 0 0;
    transition: all var(--transition-fast);
    position: relative;
}

.tab-btn.active {
    color: var(--primary-color);
    background-color: var(--white);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--primary-color);
}

.tab-btn:hover {
    color: var(--primary-color);
    background-color: var(--light-blue);
}

.tab-content {
    display: none;
    padding: var(--spacing-xl) 0;
}

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

.method-info h4 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--gray-800);
}

.method-info p {
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
    color: var(--gray-700);
}

.method-features {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.feature-tag {
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: var(--primary-color);
    color: var(--white);
    border-radius: var(--border-radius-lg);
    font-size: 0.85rem;
    font-weight: 500;
}

/* ===== TYPE CARDS ===== */
.type-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

/* Desktop type cards improvements */
@media (min-width: 1024px) {
    .type-cards {
        grid-template-columns: repeat(3, 1fr);
        gap: 2.5rem;
    }
    
    .card-header {
        padding: 2.5rem;
    }
    
    .card-header i {
        font-size: 3.5rem;
        margin-bottom: var(--spacing-lg);
    }
    
    .card-header h4 {
        font-size: 1.4rem;
    }
    
    .card-content {
        padding: 2.5rem;
    }
}

.type-card {
    background-color: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.type-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.card-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: var(--spacing-xl);
    text-align: center;
}

.card-header i {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.card-header h4 {
    font-size: 1.2rem;
    font-weight: 600;
}

.card-content {
    padding: var(--spacing-xl);
}

.card-content p {
    margin-bottom: var(--spacing-md);
    color: var(--gray-700);
    line-height: 1.6;
}

.card-content ul {
    list-style: none;
    padding: 0;
}

.card-content li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--gray-600);
}

.card-content li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* ===== APPLICATIONS & ADVANTAGES ===== */
.advantages-grid,
.app-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

/* Desktop advantages and app grid improvements */
@media (min-width: 1024px) {
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2.5rem;
    }
    
    .app-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }
    
    .advantage-item,
    .app-item {
        padding: 2rem;
    }
    
    .advantage-item i,
    .app-item i {
        font-size: 2.5rem;
        min-width: 3rem;
    }
    
    .advantage-item h4,
    .app-item h4 {
        font-size: 1.2rem;
    }
}

.advantage-item,
.app-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background-color: var(--white);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.advantage-item:hover,
.app-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.advantage-item i,
.app-item i {
    font-size: 2rem;
    color: var(--primary-color);
    min-width: 2.5rem;
}

.advantage-item h4,
.app-item h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--gray-800);
}

.advantage-item p,
.app-item p {
    color: var(--gray-600);
    font-size: 0.95rem;
}

/* ===== PRECISION INFO ===== */
.precision-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.precision-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    background-color: var(--gray-50);
    border-radius: var(--border-radius-md);
    border-left: 4px solid var(--primary-color);
}

.precision-icon {
    width: 4rem;
    height: 4rem;
    background-color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.5rem;
    flex-shrink: 0;
}

.precision-item h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--gray-800);
}

.precision-item p {
    color: var(--gray-600);
    font-size: 0.95rem;
}

/* ===== FOOTER ===== */
.footer {
    background-color: var(--gray-800);
    color: var(--gray-300);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

/* Desktop footer improvements */
@media (min-width: 1024px) {
    .footer {
        padding: 5rem 0 2rem;
    }
    
    .footer-content {
        grid-template-columns: repeat(3, 1fr);
        gap: 4rem;
        margin-bottom: 3rem;
    }
    
    .footer-section h4 {
        font-size: 1.3rem;
        margin-bottom: var(--spacing-lg);
    }
    
    .footer-section p,
    .footer-section li {
        font-size: 1.1rem;
    }
    
    .footer-bottom {
        padding-top: 2rem;
    }
}

.footer-section h4 {
    color: var(--white);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.footer-section p {
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    color: var(--gray-400);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-section a:hover {
    color: var(--white);
}

.footer-bottom {
    border-top: 1px solid var(--gray-700);
    padding-top: var(--spacing-lg);
    text-align: center;
    color: var(--gray-500);
}

/* ===== COLOR SENSORS SPECIFIC ===== */
.color-features {
    margin-top: var(--spacing-xl);
}

.color-spectrum {
    background-color: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.spectrum-bar {
    display: flex;
    height: 3rem;
    margin: var(--spacing-lg) 0;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.spectrum-section {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-weight: 600;
    font-size: 1.2rem;
}

.spectrum-section.red {
    background: linear-gradient(45deg, #dc2626, #ef4444);
}

.spectrum-section.green {
    background: linear-gradient(45deg, #059669, #10b981);
}

.spectrum-section.blue {
    background: linear-gradient(45deg, #2563eb, #3b82f6);
}

/* ===== PROXIMITY SENSORS SPECIFIC ===== */
.detection-principle {
    margin-top: var(--spacing-xl);
    background-color: var(--gray-50);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-md);
}

.principle-steps {
    display: flex;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

/* Desktop principle steps improvements */
@media (min-width: 1024px) {
    .principle-steps {
        gap: 3rem;
        margin-top: 3rem;
    }
    
    .step {
        gap: var(--spacing-lg);
    }
    
    .step-number {
        width: 3.5rem;
        height: 3.5rem;
        font-size: 1.2rem;
    }
    
    .step-content h5 {
        font-size: 1.3rem;
        margin-bottom: var(--spacing-md);
    }
    
    .step-content p {
        font-size: 1.1rem;
    }
}

.step {
    flex: 1;
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.step-number {
    width: 2.5rem;
    height: 2.5rem;
    background-color: var(--eddy-sensor);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex-shrink: 0;
}

.step-content h5 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--gray-800);
}

.step-content p {
    color: var(--gray-600);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* ===== INDUCTIVE SENSORS SPECIFIC ===== */
.measurement-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.measurement-card {
    background-color: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: all var(--transition-normal);
}

.measurement-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.measurement-icon {
    width: 4rem;
    height: 4rem;
    background: linear-gradient(135deg, var(--eddy-sensor), #319795);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    color: var(--white);
    font-size: 1.5rem;
}

.measurement-card h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--gray-800);
}

.measurement-card p {
    color: var(--gray-600);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.spec-list {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.spec-item {
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: var(--eddy-sensor);
    color: var(--white);
    border-radius: var(--border-radius-lg);
    font-size: 0.8rem;
    font-weight: 500;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.tech-item {
    padding: var(--spacing-lg);
    background-color: var(--gray-50);
    border-radius: var(--border-radius-md);
    border-left: 4px solid var(--eddy-sensor);
}

.tech-item h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--gray-800);
}

.tech-item p {
    color: var(--gray-600);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* ===== RESPONSIVE DESIGN ===== */

/* ===== TABLET AND MOBILE STYLES ===== */
@media (max-width: 768px) {
    /* Hero Mobile Padding */
    .hero {
        padding: var(--spacing-2xl) var(--spacing-md);
        min-height: 60vh;
    }
    
    /* Navigation Mobile */
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 80px;
        flex-direction: column;
        background-color: var(--white);
        width: 100%;
        text-align: center;
        transition: var(--transition-normal);
        box-shadow: var(--shadow-lg);
        padding: var(--spacing-lg) 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    
    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
    
    /* Language Switcher Mobile */
    .language-switcher {
        margin-left: 0;
        margin-right: var(--spacing-md);
        order: -1;
    }
    
    [dir="rtl"] .nav-menu.active {
        right: 0;
        left: auto;
    }
    
    [dir="rtl"] .language-switcher {
        margin-right: 0;
        margin-left: var(--spacing-md);
    }
    
    /* Hero Section Mobile */
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        padding: 0 var(--spacing-md);
    }
    
    .hero-text {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .hero-text h1 {
        font-size: 2.5rem;
        margin-bottom: var(--spacing-md);
        word-wrap: break-word;
        overflow-wrap: break-word;
    }
    
    .hero-subtitle {
        margin-bottom: var(--spacing-md);
        font-size: 1.2rem;
        word-wrap: break-word;
    }
    
    .hero-description {
        margin-bottom: var(--spacing-lg);
        padding: 0 var(--spacing-sm);
        font-size: 1rem;
        line-height: 1.6;
        word-wrap: break-word;
        text-align: center;
    }
    
    .hero-buttons {
        padding: 0 var(--spacing-md);
        gap: var(--spacing-md);
        justify-content: center;
    }
    
    .hero-visual {
        order: -1;
        margin-bottom: var(--spacing-lg);
        padding: 0 var(--spacing-md);
    }
    
    /* Additional mobile hero improvements */
    .sensor-concept-diagram {
        padding: var(--spacing-md);
    }
    
    .sensor-grid {
        padding: 0 var(--spacing-sm);
    }
    
    .sensor-icon {
        margin: var(--spacing-xs);
    }
    
    /* Content Grids Mobile */
    .content-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    /* Info Box Mobile Expansion */
    .info-box {
        padding: var(--spacing-xl) var(--spacing-lg);
        margin-top: var(--spacing-xl);
        margin-bottom: var(--spacing-xl);
    }
    
    .info-box h4 {
        font-size: 1.3rem;
        margin-bottom: var(--spacing-lg);
        line-height: 1.4;
    }
    
    .info-box li {
        padding: var(--spacing-md) 0;
        padding-left: var(--spacing-xl);
        font-size: 1.05rem;
        line-height: 1.7;
    }
    
    /* RTL Info Box Mobile */
    [dir="rtl"] .info-box {
        padding: var(--spacing-xl) var(--spacing-lg);
        text-align: right;
    }
    
    [dir="rtl"] .info-box h4 {
        font-size: 1.4rem;
        line-height: 1.5;
        margin-bottom: var(--spacing-lg);
        text-align: right;
    }
    
    [dir="rtl"] .info-box li {
        padding: var(--spacing-md) var(--spacing-xl) var(--spacing-md) 0;
        font-size: 1.1rem;
        line-height: 1.8;
        text-align: right;
        word-spacing: 0.05em;
    }
    
    .toc-grid {
        grid-template-columns: 1fr;
    }
    
    .sensor-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .type-cards {
        grid-template-columns: 1fr;
    }
    
    /* Diagrams Mobile */
    .sensor-concept-diagram {
        max-width: 250px;
        margin-bottom: var(--spacing-md);
    }
    
    .detection-diagram,
    .eddy-current-diagram,
    .rgb-analysis-diagram {
        padding: var(--spacing-md);
        margin: var(--spacing-md) 0;
    }
    
    .diagram-svg {
        max-width: 100%;
        height: auto;
    }
    
    /* Tabs Mobile */
    .method-tabs {
        flex-direction: column;
        border-bottom: none;
    }
    
    .tab-btn {
        border-radius: var(--border-radius-sm);
        border: 1px solid var(--gray-300);
    }
    
    .tab-btn.active::after {
        display: none;
    }
    
    /* Animations Mobile - Simplified for performance */
    .circuit-pattern,
    .wave-line,
    .pulse-animation,
    .detection-beam {
        animation-duration: 4s;
    }
}

/* ===== DESKTOP STYLES (OVERRIDE MOBILE) ===== */
@media (min-width: 769px) {
    /* Hero Desktop Padding */
    .hero {
        padding: var(--spacing-3xl) 0 !important;
        min-height: 80vh !important;
    }
    
    .hero-content {
        padding: 0 var(--spacing-xl) !important;
    }
    
    .hero-text {
        padding: var(--spacing-lg) 0 !important;
    }
    
    /* Navigation Desktop - Reset mobile styles */
    .nav-menu {
        position: static !important;
        left: auto !important;
        top: auto !important;
        flex-direction: row !important;
        background-color: transparent !important;
        width: auto !important;
        text-align: left !important;
        transition: none !important;
        box-shadow: none !important;
        padding: 0 !important;
        display: flex !important;
    }
    
    .nav-menu.active {
        left: auto !important;
        right: auto !important;
    }
    
    .hamburger {
        display: none !important;
    }
    
    /* Hero Section Desktop */
    .hero-content {
        grid-template-columns: 1.2fr 1fr !important;
        text-align: left !important;
    }
    
    .hero-visual {
        order: 0 !important;
        margin-bottom: 0 !important;
    }
    
    .hero-text h1 {
        font-size: 4rem !important;
    }
    
    /* Content Grids Desktop */
    .content-grid {
        grid-template-columns: 2fr 1fr !important;
        gap: var(--spacing-3xl) !important;
    }
    
    .toc-grid {
        grid-template-columns: 1fr 1fr !important;
    }
    
    .sensor-grid {
        grid-template-columns: 1fr 1fr !important;
    }
    
    .features-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)) !important;
    }
    
    .type-cards {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)) !important;
    }
    
    /* Tabs Desktop */
    .method-tabs {
        flex-direction: row;
        border-bottom: 2px solid var(--gray-200);
    }
    
    .tab-btn {
        border-radius: var(--border-radius-sm) var(--border-radius-sm) 0 0;
        border: none;
    }
    
    .tab-btn.active::after {
        display: block;
    }
    
    /* Language Switcher Desktop */
    .language-switcher {
        margin-left: var(--spacing-md);
        margin-right: 0;
        order: 0;
    }
    
    [dir="rtl"] .language-switcher {
        margin-right: var(--spacing-md);
        margin-left: 0;
    }
    
    /* Ensure floating language button is hidden on desktop */
    .floating-lang-btn {
        display: none !important;
    }
    
    .language-switcher {
        display: block !important;
    }
}

/* ===== SMALL MOBILE DEVICES ===== */
@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero-content {
        padding: 0 var(--spacing-sm) !important;
    }
    
    .hero-text {
        padding: var(--spacing-md) var(--spacing-sm) !important;
    }
    
    .hero-text h1 {
        font-size: 2rem;
        margin-bottom: var(--spacing-sm);
        word-wrap: break-word;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
        margin-bottom: var(--spacing-sm);
        word-wrap: break-word;
    }
    
    .hero-description {
        font-size: 0.95rem;
        padding: 0 !important;
        margin-bottom: var(--spacing-md);
        word-wrap: break-word;
    }
    
    /* RTL Small Mobile Improvements */
    [dir="rtl"] .hero-text h1 {
        line-height: 1.4;
        word-spacing: 0.1em;
        letter-spacing: 0.02em;
    }
    
    [dir="rtl"] .hero-subtitle {
        line-height: 1.6;
        font-weight: 400;
    }
    
    [dir="rtl"] .hero-description {
        line-height: 1.9;
        word-spacing: 0.05em;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
        padding: 0 !important;
        gap: var(--spacing-md);
    }
    
    /* Enhanced mobile styling for View Contents button */
    .btn-view-contents {
        min-width: 200px;
        font-size: 1.1rem;
        padding: var(--spacing-md) var(--spacing-xl);
    }
    
    /* Enhanced mobile styling for Start Learning button */
    .btn-start-learning {
        min-width: 200px;
        font-size: 1.2rem;
        padding: var(--spacing-md) var(--spacing-xl);
        font-weight: 700;
    }
    
    .hero-visual {
        padding: 0 var(--spacing-sm) !important;
    }
    
    /* Small Mobile Info Box Expansion */
    .info-box {
        padding: var(--spacing-lg) var(--spacing-md) !important;
        margin: var(--spacing-lg) 0 !important;
    }
    
    .info-box h4 {
        font-size: 1.2rem !important;
        margin-bottom: var(--spacing-md) !important;
    }
    
    .info-box li {
        padding: var(--spacing-sm) 0 !important;
        padding-left: var(--spacing-lg) !important;
        font-size: 1rem !important;
        line-height: 1.8 !important;
    }
    
    /* RTL Small Mobile Info Box */
    [dir="rtl"] .info-box {
        padding: var(--spacing-lg) var(--spacing-md) !important;
    }
    
    [dir="rtl"] .info-box h4 {
        font-size: 1.3rem !important;
        line-height: 1.6 !important;
        text-align: right;
    }
    
    [dir="rtl"] .info-box li {
        padding: var(--spacing-sm) var(--spacing-lg) var(--spacing-sm) 0 !important;
        font-size: 1.05rem !important;
        line-height: 1.9 !important;
        text-align: right;
        word-spacing: 0.05em;
    }
    
    /* RTL Mobile Hero Styling */
    [dir="rtl"] .hero-content {
        text-align: center;
        direction: rtl;
    }
    
    [dir="rtl"] .hero-text {
        padding: var(--spacing-md) var(--spacing-sm) !important;
        text-align: center;
        direction: rtl;
    }
    
    [dir="rtl"] .hero-text h1 {
        line-height: 1.3;
        word-spacing: 0.1em;
        font-weight: 600;
    }
    
    [dir="rtl"] .hero-subtitle {
        line-height: 1.5;
        font-weight: 400;
    }
    
    [dir="rtl"] .hero-description {
        text-align: center;
        padding: 0 !important;
        line-height: 1.8;
        word-spacing: 0.05em;
        direction: rtl;
    }
    
    [dir="rtl"] .hero-buttons {
        justify-content: center;
        direction: rtl;
    }
    
    /* RTL support for View Contents button icon */
    [dir="rtl"] .btn-view-contents i {
        margin-right: 0;
        margin-left: var(--spacing-xs);
    }
    
    /* RTL support for Start Learning button icon */
    [dir="rtl"] .btn-start-learning i {
        margin-right: 0;
        margin-left: var(--spacing-xs);
    }
    
    /* Ensure proper button text alignment in RTL mobile */
    [dir="rtl"] .btn-start-learning,
    [dir="rtl"] .btn-view-contents {
        text-align: center;
        justify-content: center;
        align-items: center;
        width: 100%;
        min-width: 200px;
    }
    
    .advantages-grid,
    .app-grid {
        grid-template-columns: 1fr;
    }
    
    .precision-grid {
        grid-template-columns: 1fr;
    }
    
    .precision-item {
        flex-direction: column;
        text-align: center;
    }
    
    .principle-steps {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .step {
        flex-direction: row;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero-text h1 {
        font-size: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .advantages-grid,
    .app-grid {
        grid-template-columns: 1fr;
    }
    
    .precision-grid {
        grid-template-columns: 1fr;
    }
    
    .precision-item {
        flex-direction: column;
        text-align: center;
    }
    
    .principle-steps {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .step {
        flex-direction: row;
    }
}

/* ===== ANIMATIONS & INTERACTIVE ELEMENTS ===== */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

.animate-on-scroll.animate-in {
    opacity: 1;
    transform: translateY(0);
}

.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    z-index: 1001;
    background-color: var(--gray-200);
}

.reading-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    width: 0%;
    transition: width 0.1s ease;
}

.floating-text {
    position: absolute;
    top: -30px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--gray-800);
    color: var(--white);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    font-size: 0.8rem;
    font-weight: 500;
    white-space: nowrap;
    animation: floatUp 2s ease-out forwards;
    z-index: 10;
    pointer-events: none;
}

@keyframes floatUp {
    0% {
        opacity: 0;
        transform: translateX(-50%) translateY(10px);
    }
    20% {
        opacity: 1;
    }
    80% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(-40px);
    }
}

.step.highlighted {
    background-color: var(--light-blue);
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-md);
    transition: all 0.3s ease;
}

.step.highlighted .step-number {
    background-color: var(--primary-color);
    transform: scale(1.1);
}

.keyboard-navigation *:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

.loaded .hero-text > * {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease-out;
}

.loaded .sensor-grid {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease-out;
}

/* ===== PULSE ANIMATION FOR INTERACTIVE ELEMENTS ===== */
@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

.sensor-icon:hover {
    animation: pulse 1s ease-in-out;
}

/* ===== ENHANCED HOVER EFFECTS ===== */
.toc-link:hover {
    box-shadow: var(--shadow-md);
}

.feature-item:hover,
.advantage-item:hover,
.app-item:hover {
    box-shadow: var(--shadow-lg);
}

.type-card:hover .card-header {
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
}

.measurement-card:hover .measurement-icon {
    transform: scale(1.1) rotate(5deg);
}

/* ===== LOADING STATE ===== */
body:not(.loaded) {
    overflow: hidden;
}

body:not(.loaded)::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--primary-color);
    z-index: 9999;
    animation: fadeOut 1s ease-out 0.5s forwards;
}

@keyframes fadeOut {
    to {
        opacity: 0;
        visibility: hidden;
    }
}