/* ============================================
   Red Hat Advanced Developer Suite v1
   Following Red Hat Brand Standards
   ============================================ */

/* ============================================
   CSS Reset & Base Styles
   ============================================ */

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

:root {
    /* Red Hat Brand Colors */
    --red-hat-red: #EE0000;
    --red-hat-black: #000000;
    --red-hat-white: #FFFFFF;
    --gray-100: #F5F5F5;
    --gray-200: #E7E7E7;
    --gray-300: #D2D2D2;
    --gray-700: #4A4A4A;
    --gray-900: #1A1A1A;

    /* Typography */
    --font-display: 'Red Hat Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-text: 'Red Hat Text', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Transitions */
    --transition: all 0.3s ease;
}

body {
    font-family: var(--font-text);
    font-size: 16px;
    line-height: 1.6;
    color: var(--red-hat-black);
    background-color: var(--red-hat-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    line-height: 1.2;
    font-weight: 700;
}

/* Sentence case per Red Hat standards */
h1 {
    font-size: 3rem;
    font-weight: 900;
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

p {
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--red-hat-red);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    opacity: 0.8;
}

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

/* ============================================
   Navigation
   ============================================ */

.navbar {
    background-color: var(--red-hat-white);
    border-bottom: 1px solid var(--gray-200);
    padding: var(--spacing-sm) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo {
    width: 40px;
    height: 40px;
}

.brand-name {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--red-hat-black);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-links a {
    color: var(--red-hat-black);
    font-weight: 500;
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
}

.nav-links a:hover {
    border-bottom-color: var(--red-hat-red);
    opacity: 1;
}

/* ============================================
   Buttons
   ============================================ */

.btn-primary,
.btn-secondary,
.btn-outline {
    display: inline-block;
    padding: 0.875rem 2rem;
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border-radius: 4px;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background-color: #CC0000;
    opacity: 1;
}

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

.btn-secondary:hover {
    background-color: var(--gray-900);
    opacity: 1;
}

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

.btn-outline:hover {
    background-color: var(--red-hat-red);
    color: var(--red-hat-white);
    opacity: 1;
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
    background: linear-gradient(135deg, var(--gray-100) 0%, var(--red-hat-white) 100%);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3.5rem;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: 1.25rem;
    line-height: 1.6;
    color: var(--gray-700);
    margin-bottom: var(--spacing-lg);
}

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

/* ============================================
   Portal vs Platform Section
   ============================================ */

.portal-platform {
    padding: var(--spacing-xl) 0;
    background-color: var(--red-hat-white);
}

.portal-platform h2 {
    text-align: center;
}

.section-intro {
    text-align: center;
    font-size: 1.125rem;
    color: var(--gray-700);
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.comparison-card {
    background-color: var(--red-hat-white);
    border: 2px solid var(--gray-200);
    border-radius: 8px;
    padding: var(--spacing-md);
    transition: var(--transition);
}

.comparison-card:hover {
    border-color: var(--red-hat-red);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    transform: translateY(-4px);
}

.portal-card:hover {
    border-color: var(--red-hat-red);
}

.platform-card:hover {
    border-color: var(--red-hat-black);
}

.card-header {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--gray-200);
}

.card-icon {
    margin-bottom: var(--spacing-sm);
}

.card-header h3 {
    margin-bottom: 0.25rem;
    font-size: 1.5rem;
}

.card-label {
    font-size: 0.875rem;
    color: var(--gray-700);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.card-body h4 {
    color: var(--red-hat-red);
    margin-bottom: var(--spacing-sm);
}

.feature-list {
    list-style: none;
    padding: 0;
}

.feature-list li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.feature-list li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--red-hat-red);
    font-weight: bold;
}

.flow-indicator {
    margin-top: var(--spacing-lg);
    text-align: center;
}

/* ============================================
   Core Pillars Section
   ============================================ */

.core-pillars {
    padding: var(--spacing-xl) 0;
    background-color: var(--gray-100);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-header h2 {
    margin-bottom: var(--spacing-sm);
}

.section-header p {
    font-size: 1.125rem;
    color: var(--gray-700);
    max-width: 700px;
    margin: 0 auto;
}

.pillars-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.pillar-card {
    background-color: var(--red-hat-white);
    padding: var(--spacing-md);
    border-radius: 8px;
    border: 2px solid transparent;
    transition: var(--transition);
}

.pillar-card:hover {
    border-color: var(--red-hat-red);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
    transform: translateY(-8px);
}

.pillar-icon {
    margin-bottom: var(--spacing-md);
}

.pillar-card h3 {
    color: var(--red-hat-black);
    margin-bottom: var(--spacing-sm);
}

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

.capability-list {
    list-style: none;
    padding: 0;
    margin-bottom: var(--spacing-md);
}

.capability-list li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--gray-700);
}

.capability-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--red-hat-red);
    font-weight: bold;
}

.learn-more {
    display: inline-block;
    color: var(--red-hat-red);
    font-weight: 600;
    margin-top: var(--spacing-sm);
}

.learn-more:hover {
    text-decoration: underline;
}

/* ============================================
   Resources Section
   ============================================ */

.resources {
    padding: var(--spacing-xl) 0;
    background-color: var(--red-hat-white);
}

.resources h2 {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.resource-card {
    background-color: var(--gray-100);
    padding: var(--spacing-md);
    border-radius: 8px;
    border-left: 4px solid var(--red-hat-red);
    transition: var(--transition);
}

.resource-card:hover {
    background-color: var(--gray-200);
    transform: translateX(4px);
}

.resource-card h4 {
    margin-bottom: var(--spacing-xs);
}

.resource-card p {
    color: var(--gray-700);
    margin-bottom: var(--spacing-sm);
}

.resource-link {
    color: var(--red-hat-red);
    font-weight: 600;
}

/* ============================================
   Footer
   ============================================ */

.footer {
    background-color: var(--red-hat-black);
    color: var(--red-hat-white);
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--gray-700);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer-brand span {
    font-family: var(--font-display);
    font-weight: 600;
}

.footer-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-links a {
    color: var(--red-hat-white);
    opacity: 0.8;
}

.footer-links a:hover {
    opacity: 1;
}

.footer-legal {
    text-align: center;
}

.footer-legal p {
    font-size: 0.875rem;
    opacity: 0.7;
    margin: 0;
}

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

@media (max-width: 1024px) {
    .hero h1 {
        font-size: 2.75rem;
    }

    .comparison-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    h1 {
        font-size: 2.25rem;
    }

    h2 {
        font-size: 2rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .hero-ctas {
        flex-direction: column;
    }

    .nav-links {
        display: none;
    }

    .navbar .brand-name {
        font-size: 1rem;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-md);
    }

    .pillars-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-md: 1.5rem;
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }

    .hero h1 {
        font-size: 1.75rem;
    }
}

/* ============================================
   Utility Classes
   ============================================ */

.text-center {
    text-align: center;
}

.text-red {
    color: var(--red-hat-red);
}

.bg-gray {
    background-color: var(--gray-100);
}

.mb-sm {
    margin-bottom: var(--spacing-sm);
}

.mb-md {
    margin-bottom: var(--spacing-md);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}