* {box-sizing: border-box}
:root {
    --accent: #4f46e5;
    --bg: #ffffff;
    --text: #0f172a;
    --muted: #64748b;
    --border: #e2e8f0;
    --card: #f8fafc;
    --on-accent: #ffffff;
    color-scheme: light dark;
}
body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
}
main, header, footer {
    margin: 0 auto;
    max-width: 960px;
    padding: 4rem 1.5rem;
}
a {
    color: var(--accent);
}
.topbar{
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    background: var(--bg);
    z-index: 10;
}
nav a {
    text-decoration: none;
    color: var(--muted);
}
.links {
    display: flex;
    gap: 1.5rem;
}
.logo {
    font-weight: 700;
    color: var(--text);
}
h1 {
    font-size: clamp(2.25rem, 6vw, 4.25rem);
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-top: 0;
    margin-bottom: 1.25rem;

}
.gradient{
    background: linear-gradient(90deg, var(--accent), #ec4899);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.button {
    display: inline-block;
    padding: 0.7rem 1.4rem;
    background: var(--accent);
    color: var(--on-accent);
    border-radius: 999px;
    font-weight: 600;
    text-decoration: none;
    transition: opacity 0.15s ease, transform 0.15s ease;
}
.button.ghost {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
}
.button:hover {
    opacity: 0.9;
    transform: translateY(-3px);
}
.hero {
    padding-bottom: 2rem;
}
.eyebrow {
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    margin-bottom: .5em;
    color: var(--accent);
}
.lead {
    color: var(--muted);
    font-size: 1.15rem;
    max-width: 620px;
}
.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.75rem;
}
.grid {
    display: grid;
    gap: 1.25rem;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
    transition: transform 0.2s ease, border-color 0.2s ease;
    display: flex;
    flex-direction: column;
    position: relative;
}
.card:hover{
    transform: translateY(-4px);
    border-color: var(--accent);
}
.card h3{
    margin: 0 0 0.5rem;
}
.card p{
    margin: 0 0 1rem;
    color: var(--muted);
}
.card .stat{
    color: var(--text);
    font-weight: 600;
}
.card ul{
    list-style: none;
    padding: 0;
    margin: 0 0 1rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}
.card li {
    padding: 0.1rem 0.7rem;
    font-size: 0.8rem;
    color: var(--muted);
    border: 1px solid var(--border);
    border-radius: 999px;
}
.card a {
    margin-top: auto;
    font-weight: 600;
    text-decoration: none;
}
.card a::after {
    content: "";
    position: absolute;
    inset: 0;
}
h2{
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    letter-spacing: -0.02em;
    margin: 0 0 1.5rem;
}
footer p{
    color: var(--muted);
    text-align: center;
}
.card:focus-within {
    border-color: var(--accent);
}
.chat-box{
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
}
.messages {
    height: 380px;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.bubble {
    max-width: 85%;
    padding: 0.65rem 0.9rem;
    line-height: 1.5;
    border-radius: 16px;
    white-space: pre-wrap;
}
.bubble.user {
    align-self: flex-end;
    background: var(--accent);
    color: var(--on-accent);
}
.bubble.bot {
    align-self: flex-start;
    background: var(--bg);
    border: 1px solid var(--border);
}
.chat-form {
    display: flex;
    gap: 0.5rem;
    padding: 0.75rem;
    border-top: 1px solid var(--border);
}
.chat-form input {
    flex: 1;
    font: inherit;
    padding: 0.65rem 0.9rem;
    border-radius: 999px;
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
}
.chat-form input:focus {
    outline: 2px solid var(--accent);
}
.chat-form .button {
    border: 0;
    font: inherit;
    font-weight: 600;
    cursor: pointer;
}
.chat-form .button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0b0d12;
        --text: #f1f5f9;
        --muted: #94a3b8;
        --accent: #818cf8;
        --border: #232733;
        --card: #12151c;
        --on-accent: #0b0d12;
    }
}