/* --- CSS Variables & Theming --- */
:root {
    --bg-color: #0d1117; /* GitHub Dark Dimmed */
    --card-bg: #161b22;
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --accent: #238636; /* GitHub Green */
    --accent-hover: #2ea043;
    --font-mono: 'Fira Code', monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
}

/* --- Typography & Links --- */
h1, h2, h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--accent);
}

/* --- Navbar --- */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 5%;
    background-color: var(--card-bg);
    border-bottom: 1px solid #30363d;
    position: sticky;
    top: 0;
    z-index: 1000;
}

/* Logo Styles */
.logo-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-logo-icon {
    height: 24px;
    width: 24px;
}

.logo-text {
    font-family: var(--font-mono);
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.cursor {
    animation: blink 1s step-end infinite;
    color: var(--accent);
}

@keyframes blink {
    50% { opacity: 0; }
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
    align-items: center;
}

.nav-links li a {
    font-size: 0.95rem;
    font-weight: 500;
}

.github-btn {
    background-color: var(--accent);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-weight: 600;
    color: #fff !important;
    transition: background-color 0.2s ease;
}

.github-btn:hover {
    background-color: var(--accent-hover);
}

/* --- Hero Section --- */
.hero {
    text-align: center;
    padding: 6rem 1rem 4rem;
}

.hero h1 {
    font-size: 3rem;
    max-width: 800px;
    margin: 0 auto 1rem;
    line-height: 1.2;
    letter-spacing: -1px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.2rem;
    margin-bottom: 2.5rem;
}

/* --- Download Buttons --- */
.download-container {
    margin: 0 auto 2.5rem;
    text-align: center;
    max-width: 800px;
}

.button-group {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.download-btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border-radius: 6px;
    font-weight: 600;
    color: #fff !important;
    transition: transform 0.2s ease, filter 0.2s ease;
    font-family: var(--font-sans);
}

.download-btn:hover {
    transform: translateY(-2px);
    filter: brightness(1.1);
}

.linux { background-color: #E95420; }
.windows { background-color: #0078D7; }
.macos { background-color: #444444; }

.note {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

/* --- Command Box (Git Clone) --- */
.command-box {
    background-color: var(--card-bg);
    border: 1px solid #30363d;
    display: inline-flex;
    align-items: center;
    padding: 1rem;
    border-radius: 8px;
    font-family: var(--font-mono);
    gap: 1rem;
    margin-top: 1rem;
}

.prompt { color: var(--accent); }
.comment { color: var(--text-secondary); }

.copy-btn {
    background-color: #30363d;
    border: 1px solid #30363d;
    color: var(--text-primary);
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    font-family: var(--font-sans);
    font-weight: 500;
    transition: all 0.2s ease;
}

.copy-btn:hover {
    background-color: #484f58;
    border-color: #8b949e;
}

/* --- Container & Grid --- */
.container {
    padding: 4rem 5%;
    max-width: 1100px;
    margin: 0 auto;
}

h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 2.5rem;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid #30363d;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
}

.card h3 {
    font-family: var(--font-mono);
    color: var(--accent);
    font-size: 1.1rem;
}

/* --- Installation Tabs --- */
.install-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: -1px;
    padding-left: 0.5rem;
    max-width: 800px;
    margin: 0 auto;
}

.tab-btn {
    background-color: #161b22;
    border: 1px solid #30363d;
    border-bottom: none;
    color: var(--text-secondary);
    padding: 0.6rem 1.5rem;
    cursor: pointer;
    border-radius: 6px 6px 0 0;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.tab-btn:hover {
    color: var(--text-primary);
    background-color: #21262d;
}

.tab-btn.active {
    background-color: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

/* --- Terminal Simulation --- */
.terminal-window {
    background-color: #0d1117;
    border-radius: 12px;
    border: 1px solid #30363d;
    font-family: var(--font-mono);
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    min-height: 280px;
    max-width: 800px;
    margin: 0 auto;
}

.terminal-header {
    background-color: #161b22;
    padding: 0.8rem 1rem;
    display: flex;
    gap: 0.6rem;
    border-bottom: 1px solid #30363d;
    align-items: center;
    border-radius: 12px 12px 0 0;
}

.terminal-title {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-left: auto;
    opacity: 0.8;
}

.dot { width: 12px; height: 12px; border-radius: 50%; }
.red { background: #ff5f56; }
.yellow { background: #ffbd2e; }
.green { background: #27c93f; }

.terminal-body {
    padding: 1.5rem;
    color: #fff;
    font-size: 0.95rem;
}

/* Toggle Logic */
.install-content {
    display: none;
    animation: fadeIn 0.2s ease-in-out;
}

.install-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

.line { margin-bottom: 0.6rem; word-break: break-all; }
.output { color: var(--text-secondary); }

/* --- Demo Section & Buttons --- */
.demo-controls {
    display: flex;
    justify-content: center;
    gap: 0.8rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.demo-btn {
    background-color: var(--card-bg);
    border: 1px solid #30363d;
    color: var(--text-secondary);
    padding: 0.5rem 1.2rem;
    border-radius: 20px;
    cursor: pointer;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.demo-btn:hover {
    border-color: var(--text-secondary);
    color: var(--text-primary);
}

.demo-btn.active {
    background-color: rgba(35, 134, 54, 0.15);
    border-color: var(--accent);
    color: var(--accent);
}

.demo-terminal {
    min-height: 320px;
}

.cursor-blink {
    animation: blink 1s step-end infinite;
    color: var(--accent);
    margin-left: 2px;
}

/* --- Footer --- */
footer {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text-secondary);
    border-top: 1px solid #30363d;
    margin-top: 4rem;
    background-color: var(--card-bg);
    font-size: 0.9rem;
}

/* --- Mobile Responsiveness --- */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }

    .nav-links {
        gap: 0.8rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero h1 { font-size: 2.2rem; }

    .command-box {
        flex-direction: column;
        gap: 0.8rem;
        width: 100%;
    }

    #clone-command {
        font-size: 0.85rem;
    }
    
    .install-tabs {
        flex-wrap: wrap;
    }
    
    .tab-btn {
        flex: 1 1 auto;
        text-align: center;
        border-bottom: 1px solid #30363d;
    }
    
    .container {
        padding: 3rem 1rem;
    }
}