@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;600;700;800&display=swap');

:root {
    /* Color Palette */
    --primary: #003B73;
    --primary-light: #0056a6;
    --secondary: #FF7A00;
    --secondary-hover: #e06c00;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f1f3f5;
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    --border-color: #e2e8f0;
    --accent-gray: #edf2f7;
    
    /* System Colors */
    --success: #2f855a;
    --warning: #dd6b20;
    --info: #3182ce;
    
    /* Layout */
    --max-width: 1280px;
    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --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);
    
    /* Theme Transition */
    --transition-speed: 0.25s;
}

[data-theme="dark"] {
    --primary: #0076e5;
    --primary-light: #3391ff;
    --secondary: #ff9133;
    --secondary-hover: #ff7a00;
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --accent-gray: #1e293b;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.3), 0 2px 4px -1px rgba(0,0,0,0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.4), 0 4px 6px -2px rgba(0,0,0,0.3);
}

/* Reset and Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.25;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(1.8rem, 3vw, 2.5rem);
    margin-bottom: 1rem;
    position: relative;
    padding-bottom: 0.5rem;
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 4px;
    background-color: var(--secondary);
    border-radius: 2px;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--primary-light);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
    width: 100%;
}

/* Header & Mega Navigation */
.header {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background-color var(--transition-speed);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
}

.logo-icon {
    width: 32px;
    height: 32px;
    fill: var(--secondary);
}

.nav-menu {
    display: flex;
    gap: 2rem;
    list-style: none;
    align-items: center;
}

.nav-item {
    position: relative;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
    padding: 0.5rem 0;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.nav-link:hover, .nav-item:hover .nav-link {
    color: var(--primary);
}

/* Mega Menu Grid */
.mega-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    width: 600px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    padding: 1.5rem;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s, transform 0.25s;
    z-index: 999;
}

.nav-item:hover .mega-menu {
    opacity: 1;
    pointer-events: auto;
    transform: translateX(-50%) translateY(0);
}

.mega-title {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--secondary);
    margin-bottom: 0.75rem;
    font-weight: 700;
}

.mega-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.mega-item a {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding: 0.25rem 0;
}

.mega-item a:hover {
    color: var(--primary);
    transform: translateX(4px);
    transition: transform 0.2s;
}

/* Controls */
.nav-controls {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
}

.theme-toggle:hover {
    background-color: var(--accent-gray);
    color: var(--primary);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
}

.nav-cta {
    background-color: var(--secondary);
    color: white;
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.9rem;
    border: none;
    cursor: pointer;
    transition: background-color 0.2s;
}

.nav-cta:hover {
    background-color: var(--secondary-hover);
    color: white;
}

/* Hero Section */
.hero {
    background: radial-gradient(circle at 80% 20%, rgba(255, 122, 0, 0.08) 0%, transparent 50%),
                radial-gradient(circle at 10% 80%, rgba(0, 59, 115, 0.08) 0%, transparent 50%),
                var(--bg-primary);
    padding: 8rem 0 6rem 0;
    position: relative;
    border-bottom: 1px solid var(--border-color);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
    align-items: center;
}

.hero-subtitle {
    font-size: clamp(1.2rem, 2vw, 1.5rem);
    color: var(--text-secondary);
    margin-top: 1.5rem;
    margin-bottom: 2.5rem;
    font-weight: 500;
}

.hero-ctas {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 3.5rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.8rem 1.8rem;
    border-radius: 6px;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.25s;
    border: 2px solid transparent;
}

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

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

.btn-secondary {
    background-color: var(--secondary);
    color: white;
}

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

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

.btn-outline:hover {
    background-color: var(--accent-gray);
    transform: translateY(-2px);
}

/* Hero Stat Grid */
.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    border-top: 1px solid var(--border-color);
    padding-top: 2.5rem;
}

.stat-item {
    text-align: left;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 0.5rem;
    font-family: var(--font-heading);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-illustration {
    width: 100%;
    max-width: 500px;
    height: auto;
    filter: drop-shadow(0 20px 30px rgba(0, 0, 0, 0.1));
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-15px); }
}

/* Sections Structure */
section {
    padding: 6rem 0;
    border-bottom: 1px solid var(--border-color);
}

.section-dark {
    background-color: var(--bg-secondary);
}

.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 4rem auto;
}

.section-header h2 {
    display: inline-block;
    margin-bottom: 1rem;
}

.section-header h2::after {
    left: 50%;
    transform: translateX(-50%);
}

.section-desc {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Section 2: What is Media Layout */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.about-tabs {
    display: flex;
    gap: 1rem;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 1.5rem;
}

.tab-btn {
    background: none;
    border: none;
    padding: 0.75rem 1rem;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    color: var(--text-muted);
    border-bottom: 3px solid transparent;
    transition: all 0.2s;
    margin-bottom: -2px;
}

.tab-btn.active, .tab-btn:hover {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.tab-panel {
    display: none;
    animation: fadeIn 0.4s ease;
}

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

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Interactive Wizard Section (Section 3) */
.wizard-box {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    overflow: hidden;
}

.wizard-form {
    padding: 3rem;
    border-right: 1px solid var(--border-color);
}

.wizard-results {
    padding: 3rem;
    background-color: var(--bg-secondary);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.wizard-step {
    margin-bottom: 2rem;
}

.wizard-step-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
    gap: 0.75rem;
}

.option-card {
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 600;
    font-size: 0.9rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--bg-primary);
}

.option-card svg {
    width: 24px;
    height: 24px;
    fill: var(--text-muted);
    transition: fill 0.2s;
}

.option-card:hover {
    border-color: var(--primary-light);
    background-color: var(--accent-gray);
}

.option-card.selected {
    border-color: var(--secondary);
    background-color: rgba(255, 122, 0, 0.05);
    color: var(--secondary);
}

.option-card.selected svg {
    fill: var(--secondary);
}

.result-placeholder {
    text-align: center;
    color: var(--text-muted);
}

.result-placeholder svg {
    width: 80px;
    height: 80px;
    fill: var(--border-color);
    margin-bottom: 1.5rem;
}

.result-output {
    display: none;
}

.result-header {
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 1.5rem;
    margin-bottom: 1.5rem;
}

.result-badge {
    background-color: var(--secondary);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    display: inline-block;
    margin-bottom: 0.5rem;
}

.result-media-name {
    font-size: 2rem;
    color: var(--primary);
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.result-item {
    border: 1px solid var(--border-color);
    padding: 1rem;
    border-radius: 6px;
    background-color: var(--bg-primary);
}

.result-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 0.25rem;
}

.result-val {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Media Cards Grid (Section 4) */
.media-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.media-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
    display: flex;
    flex-direction: column;
}

.media-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.media-card-title {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.media-specs {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    margin-bottom: 1.25rem;
    padding-bottom: 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.spec-val {
    font-size: 0.9rem;
    font-weight: 700;
}

.media-pros-cons {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.pro-con-item {
    font-size: 0.85rem;
    display: flex;
    gap: 0.5rem;
}

.pro-con-item.pro { color: var(--success); }
.pro-con-item.con { color: var(--warning); }

/* Application Database (Section 5) */
.app-filters {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 3rem;
}

.filter-btn {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1.25rem;
    border-radius: 30px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.filter-btn.active, .filter-btn:hover {
    background-color: var(--primary);
    color: white;
    border-color: var(--primary);
}

.app-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.app-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.75rem;
    transition: all 0.25s;
}

.app-card:hover {
    border-color: var(--secondary);
    box-shadow: var(--shadow-md);
}

.app-industry {
    color: var(--secondary);
    font-size: 0.8rem;
    text-transform: uppercase;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.app-title {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

/* Comparison Table (Section 6) */
.table-responsive {
    overflow-x: auto;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-md);
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

th, td {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: var(--bg-secondary);
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--text-primary);
}

tr:last-child td {
    border-bottom: none;
}

tr:hover td {
    background-color: var(--bg-secondary);
}

.comp-badge {
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 700;
}

.badge-low { background-color: rgba(47, 133, 90, 0.15); color: var(--success); }
.badge-mid { background-color: rgba(221, 107, 32, 0.15); color: var(--warning); }
.badge-high { background-color: rgba(229, 62, 62, 0.15); color: #e53e3e; }

/* Interactive Calculators Engine */
.calc-wrapper {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 3rem;
}

.calc-sidebar {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.calc-nav-btn {
    text-align: left;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 1rem 1.25rem;
    border-radius: 6px;
    font-weight: 700;
    font-family: var(--font-heading);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.calc-nav-btn.active, .calc-nav-btn:hover {
    background-color: var(--primary);
    color: white;
    border-color: var(--primary);
}

.calc-body {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 2.5rem;
    box-shadow: var(--shadow-md);
}

.calc-tab {
    display: none;
}

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

.input-group {
    margin-bottom: 1.5rem;
}

.input-label {
    display: block;
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border-radius: 6px;
    font-family: var(--font-body);
    font-size: 1rem;
    transition: border-color 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    background-color: var(--bg-primary);
}

.calc-output-box {
    margin-top: 2rem;
    background-color: var(--accent-gray);
    border-radius: 8px;
    padding: 1.5rem;
    border-left: 5px solid var(--secondary);
}

.calc-output-title {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.calc-output-val {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
    font-family: var(--font-heading);
}

/* Resources & Industry Standards Styles */
.standards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1.5rem;
}

.standard-card {
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1.5rem;
    background-color: var(--bg-primary);
    transition: border-color 0.2s;
}

.standard-card:hover {
    border-color: var(--primary);
}

.standard-code {
    color: var(--secondary);
    font-weight: 800;
    font-family: var(--font-heading);
    font-size: 1.2rem;
    margin-bottom: 0.25rem;
}

.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.resource-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
}

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

.resource-img-placeholder {
    height: 160px;
    background-color: var(--bg-secondary);
    display: flex;
    justify-content: center;
    align-items: center;
}

.resource-img-placeholder svg {
    width: 48px;
    height: 48px;
    fill: var(--text-muted);
}

.resource-content {
    padding: 1.5rem;
}

.resource-tag {
    background-color: var(--accent-gray);
    color: var(--text-secondary);
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-weight: 700;
    display: inline-block;
    margin-bottom: 0.75rem;
}

/* Articles Section */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.article-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    transition: all 0.2s;
}

.article-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.article-date {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.article-title {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

/* Footer styles */
.footer {
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 5rem 0 3rem 0;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr repeat(3, 1fr);
    gap: 4rem;
    margin-bottom: 4rem;
}

.footer-brand h3 {
    margin-bottom: 1rem;
    color: var(--primary);
}

.footer-col h4 {
    margin-bottom: 1.25rem;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-primary);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-links a {
    color: var(--text-secondary);
}

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

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Responsive media queries */
@media(max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }
    
    .hero-ctas {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .wizard-box {
        grid-template-columns: 1fr;
    }
    
    .wizard-form {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
    
    .calc-wrapper {
        grid-template-columns: 1fr;
    }
    
    .calc-sidebar {
        flex-direction: row;
        overflow-x: auto;
    }
    
    .calc-nav-btn {
        white-space: nowrap;
    }
    
    .articles-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media(max-width: 768px) {
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-menu {
        display: none;
    }
}