:root {
    --bg-color: #1a1a1a;
    --surface-color: #262626;
    --surface-hover: #333333;
    --nav-bg: rgba(26, 26, 26, 0.95);

    --text-main: #e0e0e0;
    --text-muted: #a0a0a0;

    --accent: #478061;
    --accent-light: #5aa37b;

    --code-bg: #101010;
    --border: #333;

    --font-main: var(--font-mono);
    --font-mono: "Fira Code", "Roboto Mono", monospace;
}

:root:has(#theme-toggle:checked) {
    --bg-color: #f4f4f4;
    --surface-color: #ffffff;
    --surface-hover: #e0e0e0;
    --nav-bg: rgba(255, 255, 255, 0.95);

    --text-main: #1a1a1a;
    --text-muted: #555555;

    --accent: #2e6b4d;
    --accent-light: #478061;

    --code-bg: #e8e8e8;
    --border: #d1d1d1;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: var(--font-main);
    line-height: 1.6;
    scroll-behavior: smooth;
    transition: background-color 0.3s ease, color 0.3s ease;
}

nav {
    background: var(--nav-bg);
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    backdrop-filter: blur(10px);
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.nav-logo { font-weight: bold; font-size: 1.2rem; color: var(--text-main); text-decoration: none; }
.nav-logo span { color: var(--accent); }

.nav-links { display: flex; align-items: center; gap: 1.5rem; }
.nav-links a { color: var(--text-muted); text-decoration: none; font-size: 0.9rem; transition: color 0.2s; }
.nav-links a:hover { color: var(--accent-light); }

.theme-switch-wrapper {
    display: flex;
    align-items: center;
}

#theme-toggle { display: none; }

.theme-label {
    cursor: pointer;
    background: var(--surface-color);
    border: 1px solid var(--border);
    border-radius: 20px;
    width: 46px;
    height: 24px;
    position: relative;
    transition: background 0.3s, border-color 0.3s;
    display: block;
}

.theme-label::after {
    content: "🌙";
    font-size: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    top: 1px;
    left: 2px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--text-main);
    color: var(--bg-color);
    transition: transform 0.3s, background 0.3s;
    box-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

#theme-toggle:checked + .theme-label::after {
content: "☀️";
transform: translateX(20px);
background: var(--text-main);
color: var(--bg-color);
}

.hero {
    text-align: center;
    padding: 8rem 1rem;
    max-width: 800px;
    margin: 0 auto;
}
.hero h1 { font-size: 3rem; margin-bottom: 1rem; letter-spacing: -1px; line-height: 1.2; }
.hero p { color: var(--text-muted); font-size: 1.2rem; margin-bottom: 2rem; }

.btn {
    display: inline-block;
    background: var(--accent);
    color: white !important;
    padding: 0.8rem 1.5rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    transition: background 0.2s;
}
.btn:hover { background: var(--accent-light); }

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-main) !important;
    margin-left: 1rem;
}
.btn-outline:hover {
    border-color: var(--text-muted);
    background: var(--surface-color);
}

.container { max-width: 900px; margin: 0 auto; padding: 4rem 1rem; }
section { margin-bottom: 6rem; }

h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 0.5rem;
} h2::before { content: "#"; color: var(--accent); }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.5rem; }

.card {
    background: var(--surface-color);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    transition: background-color 0.3s, border-color 0.3s;
}
.card h3 { margin-bottom: 0.5rem; color: var(--text-main); }
.card p { color: var(--text-muted); font-size: 0.95rem; margin-bottom: 1.5rem; }

.terminal {
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    margin-top: 1rem;
}
.terminal-header {
    background: var(--surface-hover);
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.dot-group { display: flex; gap: 6px; }
.dot { width: 10px; height: 10px; border-radius: 50%; background: var(--border); }
.copy-btn {
    background: transparent; border: none; color: var(--text-muted);
    cursor: pointer; font-size: 0.8rem;
}
.copy-btn:hover { color: var(--text-main); }

.terminal-body { padding: 1.5rem; font-family: var(--font-mono); font-size: 0.9rem; color: var(--text-muted); }
.comment { color: var(--accent); opacity: 0.8; }
.cmd { color: var(--text-main); }

footer {
    border-top: 1px solid var(--border);
    padding: 3rem 1rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    background: var(--surface-color);
    transition: background-color 0.3s, border-color 0.3s;
}
footer a { color: var(--text-main); text-decoration: none; margin: 0 0.5rem; }

@media (max-width: 768px) {
    .hero h1 { font-size: 2.2rem; }

    nav {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }

    .nav-links {
        gap: 1.5rem;
        font-size: 0.9rem;
    }
}