/* Core Styling Variables & System Reset */
:root {
    --bg-main: #f8fafc;
    --text-dark: #0f172a;
    --text-muted: #475569;
    --slate-dark: #1e293b;
    --industrial-orange: #ea580c;
    --industrial-hover: #c2410c;
    --border-color: #e2e8f0;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-dark);
    line-height: 1.6;
}

/* Global Container Utility */
.section-container, .header-container, .hero-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Navigation Header */
.main-header {
    background-color: var(--slate-dark);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
}

.logo {
    color: #ffffff;
    font-weight: 800;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo .badge {
    background-color: var(--industrial-orange);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-links a {
    color: #cbd5e1;
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-links a:hover {
    color: #ffffff;
}

.nav-links a.nav-cta {
    background-color: var(--industrial-orange);
    color: #ffffff;
    padding: 0.5rem 1rem;
    border-radius: 6px;
}

.nav-links a.nav-cta:hover {
    background-color: var(--industrial-hover);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: #ffffff;
    padding: 5rem 0;
    text-align: center;
}

.hero-container h1 {
    font-size: 2.75rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.15;
    max-width: 850px;
    margin: 0 auto 1.5rem auto;
}

.hero-container p {
    font-size: 1.25rem;
    color: #94a3b8;
    max-width: 650px;
    margin: 0 auto 2.5rem auto;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Core Buttons Button Rules */
.btn {
    display: inline-block;
    padding: 0.85rem 1.75rem;
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.2s ease-in-out;
}

.btn-primary {
    background-color: var(--industrial-orange);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: var(--industrial-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: rgba(255, 255, 255, 0.1);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
}

/* Value Props Feature Section */
.features {
    padding: 4rem 0;
}

.features .section-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1max));
    gap: 2rem;
}

.feature-card {
    background-color: #ffffff;
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
}

.feature-card .icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Programmatic Links Directory Section */
.directories-section {
    background-color: #ffffff;
    border-top: 1px solid var(--border-color);
    padding: 5rem 0;
}

.directories-section h2 {
    font-size: 2rem;
    font-weight: 800;
    text-align: center;
    letter-spacing: -0.03em;
    margin-bottom: 0.5rem;
}

.section-subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 3.5rem;
}

.directory-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
}

.category-group h3 {
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

.link-list {
    list-style: none;
}

.link-list li {
    margin-bottom: 0.75rem;
}

.link-list a {
    color: var(--industrial-orange);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    display: inline-block;
    transition: color 0.15s ease;
}

.link-list a:hover {
    color: var(--industrial-hover);
    text-decoration: underline;
}

.seo-note {
    margin-top: 4rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    font-style: italic;
}

/* Footer Section */
.main-footer {
    background-color: var(--slate-dark);
    color: #94a3b8;
    text-align: center;
    padding: 2rem 1.5rem;
    font-size: 0.9rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* Responsive Scaling Rules for Mobile viewports */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: 1rem;
    }
    .hero-container h1 {
        font-size: 2rem;
    }
    .hero-container p {
        font-size: 1.1rem;
    }
    .directory-grid {
        grid-template-columns: 1fr;
    }
}