:root {
    --bg-color: #f8fafc;
    /* Slightly off-white background for reduced eye strain */
    --text-color: #334155;
    /* Slate-700 */
    --heading-color: #0f172a;
    /* Slate-900 */
    --accent-color: #0ea5e9;
    /* Sky-500 */
    --accent-gradient: linear-gradient(135deg, #0ea5e9, #2563eb);
    /* Sky to Blue gradient */
    --accent-hover-gradient: linear-gradient(135deg, #0284c7, #1d4ed8);
    --border-color: #e2e8f0;
    --code-bg: #f1f5f9;
    --code-text: #0f172a;
    --step-bg: #e0f2fe;
    --step-text: #0369a1;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --card-bg: #ffffff;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.7;
    margin: 0;
    padding: 0;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

.container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 3rem;
    background-color: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow-xl, 0 20px 25px -5px rgb(0 0 0 / 0.05), 0 8px 10px -6px rgb(0 0 0 / 0.05));
}

header {
    margin-bottom: 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

h1 {
    font-size: 2rem;
    /* Significantly larger */
    color: var(--accent-color);
    margin-bottom: 0.5rem;
    text-transform: none;
    /* Removed uppercase for better readability at large size, or keep if preferred. Let's keep it but larger. */
    letter-spacing: 0.02em;
    font-weight: 800;
    line-height: 1.2;
}

h2 {
    font-size: 1.5rem;
    /* Slightly smaller to distinguish from main title */
    color: var(--heading-color);
    margin-top: 0;
    margin-bottom: 0;
    font-weight: 600;
    border-bottom: none;
    opacity: 0.8;
}

section h2 {
    font-size: 1.5rem;
    margin-top: 3rem;
    border-bottom: none;
    position: relative;
    padding-bottom: 0.5rem;
}

section h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 3rem;
    height: 3px;
    background: var(--accent-gradient);
    border-radius: 2px;
}

h3 {
    font-size: 1.25rem;
    color: var(--heading-color);
    margin-top: 2rem;
    font-weight: 600;
}

p {
    margin-bottom: 1.5rem;
}

/* Simplified Steps */
.step-list {
    list-style: none;
    padding: 0;
    counter-reset: step-counter;
}

.step-list>li {
    position: relative;
    padding-left: 3.5rem;
    margin-bottom: 2rem;
}

.step-list>li::before {
    counter-increment: step-counter;
    content: counter(step-counter);
    position: absolute;
    left: 0;
    top: 0;
    width: 2rem;
    height: 2rem;
    background-color: transparent;
    border: 2px solid var(--accent-color);
    color: var(--accent-color);
    font-weight: bold;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-family: inherit;
}

ul {
    padding-left: 1.5rem;
    margin-bottom: 1rem;
}

li {
    margin-bottom: 0.5rem;
}

strong {
    color: var(--heading-color);
    font-weight: 600;
}

code {
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    background-color: var(--code-bg);
    color: var(--accent-color);
    padding: 0.2em 0.4em;
    border-radius: 0.375rem;
    /* 6px */
    font-size: 0.9em;
    font-weight: 500;
}

/* Terminal Styling */
/* Terminal Styling */
pre {
    background-color: #ffffff;
    color: #000000;
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    margin-bottom: 1.5rem;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    border: 1px solid #e2e8f0;
    border: 1px solid #e2e8f0;
    margin: 0;
    /* Margin moved to wrapper */
    width: 100%;
}

.code-wrapper {
    margin-bottom: 1.5rem;
}

/* Copy Button */
.copy-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background-color: rgba(255, 255, 255, 0.8);
    border: 1px solid #cbd5e1;
    border-radius: 4px;
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
    color: #475569;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s, background-color 0.2s;
    font-family: 'Inter', sans-serif;
    /* Use UI font, not monospace */
}

pre:hover .copy-btn,
.code-wrapper:hover .copy-btn {
    opacity: 1;
}

.copy-btn:hover {
    background-color: white;
    color: #0ea5e9;
    /* Accent color */
    border-color: #0ea5e9;
}

.copy-btn.copied {
    background-color: #f0fdf4;
    /* Green tint */
    color: #16a34a;
    /* Green text */
    border-color: #16a34a;
}

pre code {
    background-color: transparent;
    color: inherit;
    padding: 0;
    font-size: 0.95em;
    font-weight: normal;
}

/* Terminal Prefix */
/* Terminal Prefix - Now using classes for multi-line support */
.cmd {
    display: block;
}

.cmd::before {
    content: "$ ";
    color: #475569;
    /* Slate 600 */
    user-select: none;
}

/* Specific overlay for PowerShell if needed, though .cmd is generic */
.language-powershell .cmd::before {
    content: "> ";
}

/* Continuation lines (no prefix, indented) */
.continue {
    display: block;
    padding-left: 1.25rem;
    /* Indent to align with command text after "$ " */
}

blockquote {
    border-left: 4px solid var(--accent-color);
    background-color: #f8fafc;
    margin: 1.5rem 0;
    padding: 1rem 1.5rem;
    color: #475569;
    border-radius: 0 8px 8px 0;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.15s;
}

a:hover {
    color: #0369a1;
    /* Darker Blue */
    text-decoration: underline;
}

.nav-links {
    margin-top: 5rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Rich Button Style */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    background: var(--accent-gradient);
    color: white;
    border-radius: 8px;
    /* Rounded corners but not pill */
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-md);
    border: none;
    line-height: 1;
}

.btn:hover {
    background: var(--accent-hover-gradient);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
    color: white;
    text-decoration: none;
}

/* Secondary Button (for Back / Previous) */
.btn-secondary {
    background: white;
    color: var(--text-color);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: #f8fafc;
    /* Very light gray */
    color: var(--heading-color);
    border-color: #cbd5e1;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    text-decoration: none;
}


/* New Collapsible Navigation Menu */
.tutorial-nav {
    position: relative;
    margin-bottom: 2rem;
    text-align: right;
    /* Align menu to the right or left as preferred, right looks cleaner for menu */
}

.tutorial-nav details {
    display: inline-block;
    position: relative;
    z-index: 1000;
}

.tutorial-nav summary {
    list-style: none;
    /* Hide default marker */
    cursor: pointer;
    padding: 0.5rem 1rem;
    font-weight: 600;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    /* Consistent rounded corners */
    color: var(--text-color);
    user-select: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s;
}

.tutorial-nav summary:hover {
    background-color: #f8fafc;
    border-color: #cbd5e1;
}

/* Hide webkit marker */
.tutorial-nav summary::-webkit-details-marker {
    display: none;
}

/* Custom arrow indicator */
.tutorial-nav summary::after {
    content: "▼";
    font-size: 0.7em;
    color: #94a3b8;
    /* Lighter text for arrow */
    transition: transform 0.2s;
}

.tutorial-nav details[open] summary::after {
    transform: rotate(180deg);
}

.tutorial-nav ul {
    position: absolute;
    top: 100%;
    right: 0;
    /* Align dropdown to right edge of summary */
    min-width: 250px;
    background: white;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    border-radius: 8px;
    padding: 0.5rem;
    margin-top: 8px;
    list-style: none;
    display: flex;
    flex-direction: column;
    animation: fadeIn 0.15s ease-out;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tutorial-nav ul li {
    margin: 0;
    padding: 0;
}

.tutorial-nav ul li a {
    display: block;
    padding: 0.75rem 1rem;
    text-decoration: none;
    color: var(--text-color);
    border-radius: 6px;
    transition: background-color 0.15s;
}

.tutorial-nav ul li a:hover {
    background-color: #f1f5f9;
    color: var(--accent-color);
    text-decoration: none;
}

.tutorial-nav ul li a.active {
    font-weight: 600;
    color: var(--accent-color);
    background-color: #e0f2fe;
    /* Light sky blue background */
}

/* Capabilities Grid for Index Page */
.capabilities-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}

.capability-item {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    transition: transform 0.2s;
}

.capability-item:hover {
    transform: translateY(-2px);
    border-color: var(--accent-color);
}

.cap-icon {
    font-size: 2rem;
    line-height: 1;
}

.capability-item strong {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--heading-color);
    font-size: 1.05rem;
}

.capability-item p {
    margin: 0;
    /* Override default p margin */
    font-size: 0.9rem;
    color: var(--text-color);
    line-height: 1.5;
}

/* Orbital Grid */
/* Orbital Grid */
.orbital-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-top: 1.5rem;
}

.orbital-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.orbital-card img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    margin-bottom: 0.5rem;
    background-color: #e2e8f0;
    padding: 1rem;
    box-sizing: border-box;
}

.orbital-label {
    font-weight: 600;
    color: var(--heading-color);
    display: block;
    margin-bottom: 0.25rem;
}

.orbital-desc {
    font-size: 0.85rem;
    color: var(--text-color);
}

.img-bg-gray {
    width: 50%;
    background-color: #e2e8f0;
    padding: 1rem;
    border-radius: 8px;
    box-sizing: border-box;
    border: 1px solid var(--border-color);
    display: block;
    margin: 1.5rem auto;
}