:root {
    --color-bg: #0a0a0a;
    --color-text: #e0e0e0;
    --color-accent: #4fc3f7;
    --color-heading: #ffffff;
    --color-muted: #666;
    --color-card-bg: #141414;
    --color-card-border: #222;
    --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
    font-family: var(--font-main);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

h1, h2, h3 {
    color: var(--color-heading);
}

header {
    text-align: center;
    padding: 3rem 0;
}

header h1 {
    font-size: 3rem;
    letter-spacing: 0.05em;
}

.tagline {
    color: var(--color-accent);
    font-size: 1.2rem;
    margin-top: 0.5rem;
}

section {
    margin: 2.5rem 0;
}

section h2 {
    margin-bottom: 0.75rem;
    font-size: 1.4rem;
}

.hero-highlight {
    color: var(--color-accent);
    font-style: italic;
    margin-top: 0.75rem;
}

.features {
    list-style: none;
    margin-top: 1rem;
}

.features li {
    padding: 0.3rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.features li::before {
    content: "\2022";
    color: var(--color-accent);
    position: absolute;
    left: 0;
}

.how-grid {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.how-card {
    flex: 1 1 220px;
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    border-radius: 8px;
    padding: 1.25rem;
}

.how-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--color-accent);
}

.demo-placeholder {
    border: 2px dashed var(--color-muted);
    border-radius: 8px;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-muted);
    font-size: 1.1rem;
}

#contact p {
    margin-bottom: 0.4rem;
}

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

a:hover {
    text-decoration: none;
    opacity: 0.85;
}

footer {
    margin-top: 4rem;
    text-align: center;
    color: var(--color-muted);
    font-size: 0.85rem;
}