:root {
    --primary: #5b3df5;
    --primary-dark: #4429cc;
    --accent: #12c2a5;
    --text: #1f2430;
    --muted: #5c6477;
    --bg: #ffffff;
    --bg-alt: #f5f6fb;
    --border: #e3e6ef;
    --radius: 12px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { list-style: none; }

.container { width: 100%; max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 760px; }

/* Header */
.site-header {
    position: sticky; top: 0; z-index: 50;
    background: #fff; border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.logo { font-size: 1.4rem; font-weight: 700; color: var(--text); }
.logo:hover { text-decoration: none; }
.logo-icon { color: var(--primary); }
.main-nav ul { display: flex; gap: 6px; }
.main-nav a {
    display: block; padding: 8px 14px; border-radius: 8px;
    color: var(--text); font-weight: 500;
}
.main-nav a:hover { background: var(--bg-alt); text-decoration: none; }
.main-nav a.active { color: var(--primary); background: #efecff; }
.nav-toggle { display: none; background: none; border: 0; font-size: 1.6rem; cursor: pointer; }

/* Buttons */
.btn {
    display: inline-block; padding: 12px 24px; border-radius: 8px;
    font-weight: 600; font-size: 1rem; border: 2px solid transparent; cursor: pointer;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-outline { border-color: var(--primary); color: var(--primary); background: #fff; }
.btn-outline:hover { background: #efecff; }
.btn-light { background: #fff; color: var(--primary); }
.btn-light:hover { background: #efecff; }

/* Hero */
.hero { background: linear-gradient(135deg, #f1eeff 0%, #e8fbf7 100%); padding: 70px 0; }
.hero-inner { display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px; align-items: center; }
.hero h1 { font-size: 2.6rem; line-height: 1.2; margin-bottom: 16px; }
.hero h1 span { color: var(--primary); }
.hero p { color: var(--muted); font-size: 1.1rem; margin-bottom: 26px; }
.hero-buttons { display: flex; gap: 12px; flex-wrap: wrap; }

/* Chat demo */
.chat-demo {
    background: #fff; border-radius: var(--radius);
    box-shadow: 0 14px 40px rgba(60, 40, 160, 0.18); overflow: hidden;
}
.chat-demo-header { background: var(--primary); color: #fff; padding: 14px 18px; font-weight: 600; }
.chat-demo-header small { color: #b9f5e9; font-weight: 400; }
.chat-demo-body { padding: 18px; display: flex; flex-direction: column; gap: 10px; }
.bubble { max-width: 80%; padding: 10px 14px; border-radius: 14px; font-size: 0.95rem; }
.bubble-agent { background: var(--bg-alt); align-self: flex-start; border-bottom-left-radius: 4px; }
.bubble-visitor { background: var(--primary); color: #fff; align-self: flex-end; border-bottom-right-radius: 4px; }

/* Sections */
.section { padding: 64px 0; }
.section-alt { background: var(--bg-alt); }
.section-title { text-align: center; font-size: 2rem; margin-bottom: 12px; }
.section-lead { text-align: center; color: var(--muted); max-width: 680px; margin: 0 auto 40px; }

.page-banner { background: linear-gradient(135deg, #f1eeff 0%, #e8fbf7 100%); padding: 50px 0; text-align: center; }
.page-banner h1 { font-size: 2.3rem; margin-bottom: 8px; }
.page-banner p { color: var(--muted); }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.card {
    background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
    padding: 26px; transition: transform .2s, box-shadow .2s;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 10px 28px rgba(40, 30, 120, 0.1); }
.card-icon { font-size: 2rem; margin-bottom: 10px; }
.card h3 { margin-bottom: 8px; }
.card p { color: var(--muted); }

/* Steps */
.steps { display: flex; flex-direction: column; gap: 20px; max-width: 760px; margin: 0 auto; }
.step { display: flex; gap: 20px; align-items: flex-start; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.step-number {
    flex: 0 0 48px; height: 48px; border-radius: 50%;
    background: var(--primary); color: #fff; font-weight: 700; font-size: 1.2rem;
    display: flex; align-items: center; justify-content: center;
}
.step h3 { margin-bottom: 4px; }
.step p { color: var(--muted); }

/* FAQ */
.faq { background: #fff; border: 1px solid var(--border); border-radius: 10px; padding: 16px 20px; margin-bottom: 12px; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq p { margin-top: 10px; color: var(--muted); }

/* CTA */
.cta { background: var(--primary); color: #fff; text-align: center; padding: 56px 0; }
.cta h2 { font-size: 1.9rem; margin-bottom: 8px; }
.cta p { margin-bottom: 22px; opacity: .9; }

/* Form */
.contact-form { display: flex; flex-direction: column; gap: 8px; }
.contact-form label { font-weight: 600; margin-top: 10px; }
.contact-form input, .contact-form textarea {
    padding: 12px 14px; border: 1px solid var(--border); border-radius: 8px;
    font: inherit; width: 100%;
}
.contact-form input:focus, .contact-form textarea:focus {
    outline: 2px solid var(--primary); border-color: transparent;
}
.contact-form button { margin-top: 18px; align-self: flex-start; }

.alert { padding: 14px 18px; border-radius: 8px; margin-bottom: 20px; }
.alert ul { list-style: disc; padding-left: 18px; }
.alert-success { background: #e6f9f3; color: #0b6b55; border: 1px solid #b6ecdc; }
.alert-error { background: #fdeceb; color: #9b2c24; border: 1px solid #f5c2be; }

/* Footer */
.site-footer { background: #151a2b; color: #c8cde0; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 30px; padding: 46px 20px; }
.site-footer h3, .site-footer h4 { color: #fff; margin-bottom: 10px; }
.site-footer a { color: #c8cde0; }
.site-footer li { margin-bottom: 6px; }
.footer-bottom { border-top: 1px solid #2a3150; padding: 16px 0; font-size: 0.9rem; text-align: center; }

/* Responsive */
@media (max-width: 800px) {
    .hero-inner, .cards, .footer-grid { grid-template-columns: 1fr; }
    .hero h1 { font-size: 2rem; }
    .nav-toggle { display: block; }
    .main-nav {
        display: none; position: absolute; top: 66px; left: 0; right: 0;
        background: #fff; border-bottom: 1px solid var(--border); padding: 10px 20px;
    }
    .main-nav.open { display: block; }
    .main-nav ul { flex-direction: column; }
}