/* ============================================
   s390x ABI Documentation - Styles
   ============================================ */

/* CSS Variables for Light Theme (Default) */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #3498db;
    --text-color: #333;
    --text-light: #666;
    --bg-color: #ffffff;
    --bg-light: #f8f9fa;
    --border-color: #e1e4e8;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.15);
    --border-radius: 8px;
    --max-width: 1200px;
}

/* Dark Theme - Automatically applied based on user's system preference */
@media (prefers-color-scheme: dark) {
    :root {
	--primary-color: #4e6f8e;
	--secondary-color: #2c3e50;
	--accent-color: #5dade2;
	--text-color: #e4e4e4;
	--text-light: #b0b0b0;
	--bg-color: #1e1e1e;
	--bg-light: #2a2a2a;
	--border-color: #404040;
	--shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
	--shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.4);
    }
}

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

body {
    font-family: 'IBM Plex Sans', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-light);
}

/* Container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    text-align: center;
    padding: 60px 20px 40px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    margin-bottom: 40px;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: -0.5px;
}

header h2 {
    font-size: 1.8rem;
    font-weight: 400;
    margin-bottom: 10px;
    opacity: 0.95;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.85;
    font-weight: 300;
}

/* Main Content */
main {
    background-color: var(--bg-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 40px;
    margin-bottom: 40px;
}

/* Hero Section */
.hero {
    text-align: center;
    margin-bottom: 50px;
}

.description {
    font-size: 1.15rem;
    line-height: 1.8;
    color: var(--text-light);
    max-width: 800px;
    margin: 0 auto 40px;
}

/* Download Section */
.download-section {
    margin: 40px 0;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 40px;
    font-size: 1.1rem;
    font-weight: 600;
    color: white;
    background-color: var(--accent-color);
    border: none;
    border-radius: var(--border-radius);
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.btn-primary:hover {
    background-color: #2980b9;
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-icon {
    font-size: 1.3rem;
}

.version-info {
    margin-top: 15px;
    font-size: 0.9rem;
    color: var(--text-light);
}

.version-info time {
    font-weight: 500;
}

/* Info Grid */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin: 50px 0;
}

.info-card {
    padding: 30px;
    background-color: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
}

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

.info-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.info-card p {
    color: var(--text-light);
    line-height: 1.7;
}

/* Links Section */
.links-section {
    margin: 50px 0;
    padding: 30px;
    background-color: var(--bg-light);
    border-radius: var(--border-radius);
}

.links-section h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.resource-links {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.resource-links li {
    margin: 0;
}

.resource-links a {
    display: block;
    padding: 12px 20px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--accent-color);
    text-decoration: none;
    transition: all 0.2s ease;
    font-weight: 500;
}

.resource-links a:hover {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    transform: translateX(5px);
}

/* About Section */
.about-section {
    margin: 50px 0 0;
    padding-top: 40px;
    border-top: 2px solid var(--border-color);
}

.about-section h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.about-section p {
    margin-bottom: 15px;
    line-height: 1.8;
    color: var(--text-light);
}

.about-section a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease;
}

.about-section a:hover {
    border-bottom-color: var(--accent-color);
}

/* Footer */
footer {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 40px 20px;
    margin-top: 60px;
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
}

.license {
    margin-bottom: 25px;
}

.license h4 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.license p {
    line-height: 1.7;
    opacity: 0.9;
}

.license a {
    color: var(--accent-color);
    opacity: 0.8;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease;
}

.footer-links {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.footer-links a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease;
}

.footer-links a:hover {
    border-bottom-color: white;
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
	font-size: 2rem;
    }

    header h2 {
	font-size: 1.5rem;
    }

    main {
	padding: 25px;
    }

    .description {
	font-size: 1rem;
    }

    .btn-primary {
	padding: 14px 30px;
	font-size: 1rem;
    }

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

    .resource-links {
	grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    header {
	padding: 40px 15px 30px;
    }

    header h1 {
	font-size: 1.75rem;
    }

    header h2 {
	font-size: 1.3rem;
    }

    main {
	padding: 20px;
    }

    .info-card {
	padding: 20px;
    }
}

/* Print Styles */
@media print {
    body {
	background-color: white;
    }

    header {
	background: white;
	color: black;
	border-bottom: 2px solid black;
    }

    main {
	box-shadow: none;
    }

    .btn-primary {
	display: none;
    }

    footer {
	background-color: white;
	color: black;
	border-top: 2px solid black;
    }

    a {
	color: black;
	text-decoration: underline;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
	animation-duration: 0.01ms !important;
	animation-iteration-count: 1 !important;
	transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
a:focus,
button:focus {
    outline: 3px solid var(--accent-color);
    outline-offset: 2px;
}