:root {
    --bg-base: #FFFFFF;
    --bg-surface: #F3F5F9;
    --primary: #4072DA;
    --accent-purple: #A659DA;
    --text-primary: #13151A;
    --text-secondary: #5B6472;
    --border-subtle: rgba(15, 23, 42, 0.08);
    --radius-sm: 12px;
    --radius-md: 24px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: 'Space Grotesk', 'Inter', sans-serif; line-height: 1.2; }

.gradient-text-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent-purple));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 20px 5%;
    border-bottom: 1px solid var(--border-subtle);
    flex-wrap: wrap;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
    text-decoration: none;
}

.nav-links { display: flex; gap: 20px; flex-wrap: wrap; }

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
}

.nav-links a:hover { color: var(--primary); }

.btn {
    display: inline-block;
    padding: 12px 26px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    color: #FFFFFF;
    background: linear-gradient(135deg, var(--primary), #2563EB);
}

.btn-play { background: linear-gradient(135deg, #3B82F6, #2563EB); }

main { max-width: 820px; margin: 0 auto; padding: 56px 5% 80px; }

.breadcrumb { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 28px; }
.breadcrumb a { color: var(--primary); text-decoration: none; }

h1 { font-size: clamp(2rem, 5vw, 2.9rem); margin-bottom: 20px; }

.lede { font-size: 1.15rem; color: var(--text-secondary); margin-bottom: 40px; }

h2 { font-size: 1.6rem; margin: 48px 0 16px; }
h3 { font-size: 1.15rem; margin: 32px 0 10px; }

p { margin-bottom: 18px; color: var(--text-secondary); }

ul { margin: 0 0 20px 22px; color: var(--text-secondary); }
li { margin-bottom: 10px; }

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

a { color: var(--primary); }

.callout {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 24px 28px;
    margin: 32px 0;
}

.callout p:last-child { margin-bottom: 0; }

.cta { text-align: center; margin: 56px 0 0; }
.cta-buttons { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-top: 20px; }

.related { border-top: 1px solid var(--border-subtle); margin-top: 56px; padding-top: 28px; }
.related ul { list-style: none; margin-left: 0; }

footer {
    padding: 40px 5%;
    background: var(--bg-surface);
    border-top: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-align: center;
}

footer a { color: var(--text-secondary); margin: 0 10px; }

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg-base: #0C0E13;
        --bg-surface: #14171F;
        --text-primary: #F1F3F7;
        --text-secondary: #9AA3B2;
        --border-subtle: rgba(241, 243, 247, 0.1);
    }
}