/*
 * X-Ray Screening Technology - Main Stylesheet
 * Enterprise Blue Theme with Safety Yellow Accents
 * Mobile-First Responsive Design
 */

/* ========================================
   CSS VARIABLES & THEME
   ======================================== */
:root {
    /* Color Palette */
    --color-primary: #0a2540;
    --color-primary-light: #1a365d;
    --color-primary-dark: #051628;
    --color-accent: #ffcc00;
    --color-accent-hover: #e6b800;

    /* Grays */
    --color-gray-50: #f8f9fa;
    --color-gray-100: #e9ecef;
    --color-gray-200: #dee2e6;
    --color-gray-300: #ced4da;
    --color-gray-700: #495057;
    --color-gray-900: #212529;

    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    /* Layout */
    --max-width: 1200px;
    --header-height: 70px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    --shadow-md: 0 3px 6px rgba(0, 0, 0, 0.15), 0 2px 4px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.15), 0 3px 6px rgba(0, 0, 0, 0.10);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--color-gray-900);
    background: var(--color-gray-50);
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

a:hover {
    color: var(--color-accent);
}

ul {
    list-style: none;
}

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

.section-padding {
    padding: var(--spacing-2xl) 0;
}

.bg-dark {
    background: var(--color-primary);
    color: #fff;
}

.light {
    color: #fff;
}

/* ========================================
   HEADER & NAVIGATION
   ======================================== */
.header {
    background: #fff;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--header-height);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
}

.logo-text {
    display: none;
}

.nav-links {
    display: none;
    gap: var(--spacing-lg);
}

.nav-links li a {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--color-gray-700);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-links li a:hover {
    color: var(--color-primary);
}

.nav-links li a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition-base);
}

.nav-links li a:hover::after {
    width: 100%;
}

/* Mobile Menu Toggle */
.mobile-toggle {
    display: flex;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-primary);
    transition: transform var(--transition-base);
}

/* ========================================
   HERO SECTION
   ======================================== */
.hero {
    min-height: 70vh;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-lg);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 600"><path fill="rgba(255,204,0,0.05)" d="M0 300L50 283.3C100 266.7 200 233.3 300 233.3C400 233.3 500 266.7 600 283.3C700 300 800 300 900 283.3C1000 266.7 1100 233.3 1150 216.7L1200 200V600H1150C1100 600 1000 600 900 600C800 600 700 600 600 600C500 600 400 600 300 600C200 600 100 600 50 600H0V300Z"/></svg>');
    opacity: 0.3;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 900px;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2.5vw, 1.4rem);
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
    font-weight: 300;
}

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

/* ========================================
   SCANLINE ANIMATION (CRT Effect)
   ======================================== */
.scanline-text {
    position: relative;
    overflow: hidden;
}

.scanline-text::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
    animation: scanline 3s ease-in-out infinite;
    opacity: 0.6;
}

@keyframes scanline {
    0%, 100% {
        left: -100%;
    }
    50% {
        left: 100%;
    }
}

/* ========================================
   BUTTONS
   ======================================== */
.btn {
    display: inline-block;
    padding: 0.75rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition-base);
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    color: #fff;
    border-color: #fff;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: #fff;
}

/* ========================================
   SECTION TITLES
   ======================================== */
.section-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    text-align: center;
    color: var(--color-primary);
}

.section-intro {
    text-align: center;
    font-size: 1.1rem;
    color: var(--color-gray-700);
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
}

/* ========================================
   AD CONTAINERS
   ======================================== */
.ad-container {
    margin: var(--spacing-lg) auto;
    padding: var(--spacing-sm);
    background: var(--color-gray-100);
    border: 1px dashed var(--color-gray-300);
    text-align: center;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ad-leaderboard {
    max-width: 728px;
    min-height: 90px;
}

.ad-rectangle {
    max-width: 300px;
    min-height: 250px;
}

.ad-sidebar {
    max-width: 300px;
    min-height: 600px;
}

.ad-sidebar.sticky {
    position: sticky;
    top: calc(var(--header-height) + var(--spacing-md));
}

/* ========================================
   FEATURES GRID
   ======================================== */
.features-section {
    background: #fff;
}

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

.feature-card {
    background: #fff;
    border: 1px solid var(--color-gray-200);
    border-radius: 8px;
    padding: var(--spacing-lg);
    transition: all var(--transition-base);
    text-align: center;
}

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

.feature-icon {
    margin: 0 auto var(--spacing-md);
    width: 60px;
    height: 60px;
}

.feature-card h3 {
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.feature-card p {
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.feature-link {
    color: var(--color-accent);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

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

/* ========================================
   SIMULATOR SECTION
   ======================================== */
.simulator-section {
    background: var(--color-primary);
    color: #fff;
}

.simulator-container {
    margin-top: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.scanner-viewport {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    border: 3px solid var(--color-accent);
    border-radius: 8px;
    overflow: hidden;
    cursor: crosshair;
    background: #000;
}

.scanner-image {
    width: 100%;
    height: auto;
    display: block;
}

.scanner-image.normal-view {
    position: relative;
    z-index: 1;
}

.scanner-image.xray-view {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 2;
    pointer-events: none;
    opacity: 0;
}

.scanner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 3;
    pointer-events: none;
}

#scanner-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 4;
    pointer-events: none;
}

.simulator-instructions {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 204, 0, 0.3);
    border-radius: 8px;
    padding: var(--spacing-lg);
}

.simulator-instructions h4 {
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
    font-size: 1.2rem;
}

.simulator-instructions ul {
    list-style: disc;
    padding-left: var(--spacing-lg);
}

.simulator-instructions li {
    margin-bottom: var(--spacing-xs);
    line-height: 1.7;
}

/* ========================================
   CONTENT ARTICLE
   ======================================== */
.content-article {
    background: #fff;
}

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

.article-content {
    max-width: 800px;
}

.article-content h2 {
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.article-content h3 {
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-sm);
}

.lead-paragraph {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-lg);
}

.article-content p {
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.article-content ul {
    list-style: disc;
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.article-content li {
    margin-bottom: var(--spacing-xs);
    line-height: 1.7;
}

.article-content strong {
    color: var(--color-primary);
    font-weight: 600;
}

.content-footer {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 2px solid var(--color-gray-200);
}

.disclaimer-note {
    background: var(--color-gray-100);
    border-left: 4px solid var(--color-accent);
    padding: var(--spacing-md);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ========================================
   EQUIPMENT SECTION
   ======================================== */
.equipment-section {
    background: var(--color-gray-100);
}

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

.equipment-card {
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base);
}

.equipment-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.equipment-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.equipment-card h3 {
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-xs);
    color: var(--color-primary);
    font-size: 1.3rem;
}

.equipment-card p {
    padding: 0 var(--spacing-md) var(--spacing-md);
    color: var(--color-gray-700);
    line-height: 1.6;
}

.equipment-card .btn {
    margin: 0 var(--spacing-md) var(--spacing-md);
}

/* ========================================
   FOOTER
   ======================================== */
.footer {
    background: var(--color-primary-dark);
    color: #fff;
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

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

.footer-col h4 {
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
    font-size: 1.1rem;
}

.footer-col ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-col ul li a {
    color: rgba(255, 255, 255, 0.8);
    transition: color var(--transition-fast);
}

.footer-col ul li a:hover {
    color: var(--color-accent);
}

.footer-col p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

/* ========================================
   GLOSSARY STYLES
   ======================================== */
.glossary-search {
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

.search-input {
    width: 100%;
    padding: var(--spacing-md);
    font-size: 1.1rem;
    border: 2px solid var(--color-gray-300);
    border-radius: 8px;
    font-family: var(--font-primary);
    transition: border-color var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-accent);
}

.glossary-list {
    max-width: 900px;
    margin: 0 auto;
}

.glossary-term {
    background: #fff;
    border: 1px solid var(--color-gray-200);
    border-radius: 8px;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    transition: border-color var(--transition-fast);
}

.glossary-term:hover {
    border-color: var(--color-accent);
}

.glossary-term dt {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.glossary-term dd {
    color: var(--color-gray-700);
    line-height: 1.7;
}

.glossary-letter {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-accent);
    margin: var(--spacing-xl) 0 var(--spacing-md);
    padding-bottom: var(--spacing-xs);
    border-bottom: 3px solid var(--color-accent);
}

/* ========================================
   FAQ STYLES (Safety Page)
   ======================================== */
.faq-section {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: #fff;
    border: 1px solid var(--color-gray-200);
    border-radius: 8px;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.faq-question {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.faq-answer {
    color: var(--color-gray-700);
    line-height: 1.8;
}

/* ========================================
   RESPONSIVE DESIGN - TABLET
   ======================================== */
@media (min-width: 768px) {
    .logo-text {
        display: inline;
    }

    .mobile-toggle {
        display: none;
    }

    .nav-links {
        display: flex;
    }

    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .equipment-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .content-wrapper {
        grid-template-columns: 1fr 300px;
    }

    .sidebar {
        order: 2;
    }

    .simulator-container {
        flex-direction: row;
        align-items: flex-start;
    }

    .scanner-viewport {
        flex: 1;
    }

    .simulator-instructions {
        flex: 0 0 300px;
    }
}

/* ========================================
   RESPONSIVE DESIGN - DESKTOP
   ======================================== */
@media (min-width: 1024px) {
    .footer-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* ========================================
   PERFORMANCE OPTIMIZATIONS
   ======================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print Styles */
@media print {
    .header,
    .footer,
    .ad-container,
    .hero-cta,
    .mobile-toggle {
        display: none;
    }

    body {
        background: #fff;
        color: #000;
    }
}