:root {
    --bg: #0d1117;
    --bg2: #161b22;
    --text: #c9d1d9;
    --text2: #8b949e;
    --accent: #58a6ff;
    --border: #30363d;
}
[data-theme="light"] {
    --bg: #ffffff;
    --bg2: #f6f8fa;
    --text: #24292f;
    --text2: #57606a;
    --accent: #0969da;
    --border: #d0d7de;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}
header {
    background: var(--bg2);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem 2rem;
}
header h1 { font-size: 1.8rem; margin-bottom: 0.3rem; }
header .subtitle { color: var(--text2); font-size: 1rem; margin-top: 0.3rem; }
nav { margin-top: 1rem; }
nav a {
    color: var(--accent);
    text-decoration: none;
    margin-right: 1.5rem;
    font-weight: 500;
}
nav a:hover { text-decoration: underline; }
.container { max-width: 1200px; margin: 0 auto; padding: 2rem; }
.hero { text-align: center; padding: 3rem 0; }
.hero h2 { font-size: 2.5rem; margin-bottom: 1rem; }
.hero p { font-size: 1.2rem; color: var(--text2); }
h2 { font-size: 2rem; margin: 2.5rem 0 1.5rem; color: var(--accent); }
h3 { font-size: 1.4rem; margin: 1.5rem 0 0.5rem; }
section { margin: 2rem 0; }
.guarantee {
    background: var(--bg2);
    padding: 2rem;
    border-radius: 8px;
    margin: 2rem 0;
    text-align: center;
}
.guarantee h2 { margin-top: 0; }
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}
.feature-card, .feature-box, .step-box {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
}
.feature-card h3, .feature-box h3, .step-box h3 {
    color: var(--accent);
    margin-top: 0;
}
.tutorial-card {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    cursor: pointer;
    transition: all 0.2s;
}
.tutorial-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}
.tutorial-card h3 { margin-top: 0; }
.tutorial-card a { color: var(--accent); text-decoration: none; }
.tutorial-card a:hover { text-decoration: underline; }
.meta { color: var(--text2); font-size: 0.9rem; margin: 0.5rem 0; }
.keywords { color: var(--text2); font-size: 0.9rem; margin-top: 0.5rem; }
.search-box {
    margin: 2rem 0;
    padding: 1.5rem;
    background: var(--bg2);
    border-radius: 8px;
}
.search-box input {
    width: 100%;
    padding: 1rem;
    font-size: 1.1rem;
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
}
.cta-section {
    text-align: center;
    margin: 3rem 0;
}
.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}
.btn-primary, .btn-secondary {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
}
.btn-primary {
    background: var(--accent);
    color: white;
}
.btn-secondary {
    background: var(--bg2);
    color: var(--accent);
    border: 1px solid var(--accent);
}
.btn-primary:hover, .btn-secondary:hover {
    opacity: 0.9;
}
.hidden { display: none !important; }
.back-link { margin-top: 2rem; }
.back-link a { color: var(--accent); text-decoration: none; }
footer {
    text-align: center;
    padding: 2rem;
    color: var(--text2);
    border-top: 1px solid var(--border);
    margin-top: 4rem;
}
footer p { margin: 0.3rem 0; }
ul { margin-left: 2rem; }
li { margin: 0.5rem 0; }