:root {
    --bg-color: #0d1117;
    --card-bg: #161b22;
    --accent: #58a6ff;
    --feature-accent: #388bfd; /* Distinct, punchier blue for the informational feature cards */
    --text: #c9d1d9;
    --text-muted: #8b949e;
    --border-color: #30363d;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.container {
    max-width: 1400px;
    width: 100%;
}

h2 {
    margin-bottom: 0.5rem;
    color: #f0f6fc;
}

.subtitle {
    color: var(--text-muted);
    margin-bottom: 2rem;
    font-size: 0.95rem;
}

.step-section {
    margin-bottom: 2.5rem;
}

/* Flex/Grid Matrix Setup */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    gap: 1rem;
}

/* Forces the interactive installer options into a clean row profile */
.selector-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 0.75rem;
}

/* Option Cards */
.option-btn {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1.25rem;
    color: var(--text);
    cursor: pointer;
    text-align: left;
    transition: border-color 0.2s, transform 0.2s, background-color 0.2s;
}

.option-btn:hover {
    border-color: #8b949e;
    transform: translateY(-1px);
}

.option-btn.active {
    border-color: var(--accent);
    background-color: #1f2937;
    box-shadow: 0 0 0 1px var(--accent);
}

.option-btn h3 {
    margin: 0 0 0.4rem 0;
    font-size: 1.05rem;
    color: #f0f6fc;
}

.option-btn p {
    margin: 0;
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.4;
}

/* Progressive Reveal Transitions */
.conditional-step {
    opacity: 0;
    visibility: hidden;
    max-height: 0;
    overflow: hidden;
    transform: scale(0.99);
    transition: opacity 0.35s ease-in-out, transform 0.35s ease-in-out, max-height 0.35s ease-in-out, visibility 0s 0.35s;
}

.conditional-step.visible {
    opacity: 1;
    visibility: visible;
    max-height: 1000px;
    transform: scale(1);
    transition: opacity 0.35s ease-in-out, transform 0.35s ease-in-out, max-height 0.45s ease-in-out, visibility 0s 0s;
}

/* Download Container Panel */
.download-box {
    background: linear-gradient(135deg, #161b22, #0d1117);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 2rem;
    margin-top: 2rem;
    text-align: center;
}

.download-btn {
    display: inline-block;
    background-color: #238636;
    color: white;
    padding: 0.75rem 2.5rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    margin-top: 1.2rem;
    transition: background-color 0.2s;
}

.download-btn:hover {
    background-color: #2ea043;
}

/* Brand Header Formatting Layout */
.brand-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.brand-logo {
    height: 50px;
    width: auto;
    max-width: 100%;
    object-fit: contain;   
    image-rendering: auto;
    margin-bottom: 1rem;
}

.brand-header h1 {
    font-size: 2.6rem;
    font-weight: 800;
    color: #f0f6fc;
    margin: 0;
    letter-spacing: -0.5px;
}

.brand-subtitle {
    color: var(--text-muted);
    font-size: 1.05rem;
    margin-top: 0.6rem;
    font-weight: 400;
}

/* Small, clean section divider text */
.section-divider-tag {
    text-align: center;
    font-size: 1.25rem;
    font-weight: 800;
    color: #f0f6fc;
    letter-spacing: 3px;
    margin: 0 0 2rem 0;
    user-select: none;
}

/* 2-Column Split Presentation Layout Engine */
.main-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    width: 100%;
    margin-top: 2rem;
}

@media (min-width: 1024px) {
    .main-layout {
        grid-template-columns: 1.2fr 1fr;
    }
}

/* Features Layout & Cards */
.features-section {
    margin-bottom: 2.5rem;
}

.feature-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.25rem;
}

@media (min-width: 600px) {
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.feature-card {
    background-color: #121820; /* Slightly darker shift for visual contrast */
    border: 1px solid var(--feature-accent);
    box-shadow: 0 0 0 1px var(--feature-accent);
    border-radius: 6px;
    padding: 1.25rem;
    text-align: left;
}

.feature-card h3 {
    margin: 0 0 0.5rem 0;
    color: #f0f6fc;
    font-size: 1.1rem;
}

.feature-card p {
    margin: 0;
    font-size: 0.85rem;
    line-height: 1.5;
    color: var(--text);
}

.feature-card a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
}

.feature-card a:hover {
    text-decoration: underline;
    color: #8bc2ff;
}

.feature-card code {
    background: rgba(255, 255, 255, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    color: #f0f6fc;
    font-size: 0.8rem;
}