:root {
    --ink: #1c2333;
    --muted: #5b6475;
    --bg: #ffffff;
    --bg-alt: #f4f6fa;
    --line: #e2e6ee;
    --primary: #2f5bea;
    --primary-dark: #1f43b8;
    --accent: #0fa3a3;
    --left: #eef2ff;
    --right: #e6f7f6;
    --radius: 14px;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--ink);
    background: var(--bg);
    line-height: 1.65;
    font-size: 17px;
}

.container { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 720px; }
.center { text-align: center; margin-left: auto; margin-right: auto; }
.muted { color: var(--muted); }
.small { font-size: .9rem; }

h1, h2, h3 { line-height: 1.2; letter-spacing: -.02em; }
h1 { font-size: clamp(2.1rem, 5vw, 3.3rem); font-weight: 800; margin-bottom: 18px; }
h1 em { font-style: normal; color: var(--primary); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.2rem); font-weight: 800; margin-bottom: 18px; }
h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 6px; }
p + p { margin-top: 14px; }

.eyebrow {
    font-size: .8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .1em;
    color: var(--accent);
    margin-bottom: 12px;
}

/* Botões */
.btn {
    display: inline-block;
    background: var(--primary);
    color: #fff;
    border: 2px solid var(--primary);
    padding: 13px 24px;
    border-radius: 999px;
    font: inherit;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: background .2s, transform .1s;
}
.btn:hover { background: var(--primary-dark); border-color: var(--primary-dark); }
.btn:active { transform: translateY(1px); }
.btn-ghost { background: transparent; color: var(--primary); }
.btn-ghost:hover { background: var(--left); color: var(--primary-dark); }
.btn-small { padding: 8px 16px; font-size: .9rem; }
.btn-light { background: #fff; color: var(--primary); border-color: #fff; }
.btn-light:hover { background: var(--left); border-color: var(--left); color: var(--primary-dark); }

/* Topbar */
.topbar {
    position: sticky; top: 0; z-index: 10;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--line);
}
.topbar-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 1.2rem; color: var(--ink); text-decoration: none; }
.logo span { color: var(--primary); }

/* Hero */
.hero { padding: 80px 0 70px; background: linear-gradient(180deg, var(--bg-alt), var(--bg)); }
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; }
.lead { font-size: 1.15rem; color: var(--muted); max-width: 560px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }

.chat {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 22px;
    box-shadow: 0 20px 50px -20px rgba(28,35,51,.25);
    display: flex; flex-direction: column; gap: 12px;
}
.bubble {
    max-width: 85%;
    padding: 12px 16px;
    border-radius: 16px;
    font-size: .95rem;
    opacity: 0;
    transform: translateY(8px);
    animation: pop .5s forwards;
}
.bubble .who { display: block; font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin-bottom: 2px; }
.bubble.left { background: var(--left); align-self: flex-start; border-bottom-left-radius: 4px; }
.bubble.right { background: var(--right); align-self: flex-end; border-bottom-right-radius: 4px; }
.bubble:nth-child(2) { animation-delay: .6s; }
.bubble:nth-child(3) { animation-delay: 1.2s; }
@keyframes pop { to { opacity: 1; transform: none; } }

/* Seções */
.section { padding: 80px 0; }
.section.alt { background: var(--bg-alt); }

.cards-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 40px; }
.card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 26px;
}
.card p { color: var(--muted); font-size: .95rem; }
.icon { font-size: 1.8rem; margin-bottom: 10px; }

.steps { list-style: none; display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 40px; }
.steps li { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; }
.steps p { color: var(--muted); font-size: .95rem; }
.num {
    display: inline-flex; align-items: center; justify-content: center;
    width: 38px; height: 38px; border-radius: 50%;
    background: var(--primary); color: #fff; font-weight: 800;
    margin-bottom: 14px;
}

.rules { list-style: none; margin-top: 30px; display: grid; gap: 12px; }
.rules li {
    background: #fff;
    border: 1px solid var(--line);
    border-left: 4px solid var(--accent);
    border-radius: 10px;
    padding: 14px 18px;
}

.sources { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin: 34px 0 24px; }
.sources a {
    display: block;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 18px;
    text-decoration: none;
    color: var(--ink);
    transition: border-color .2s, transform .2s;
}
.sources a:hover { border-color: var(--primary); transform: translateY(-2px); }
.sources span { display: block; color: var(--muted); font-size: .85rem; margin-top: 2px; }

/* Convite */
.model {
    background: #fff;
    border: 1px solid var(--line);
    border-left: 4px solid var(--primary);
    border-radius: 16px;
    padding: 28px;
    margin-top: 30px;
}
.model-label {
    display: inline-block;
    font-size: .75rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em;
    color: var(--primary); background: var(--left);
    padding: 4px 10px; border-radius: 999px; margin-bottom: 14px;
}
.model ul { list-style: none; display: grid; gap: 8px; margin: 14px 0; }
.tips { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 24px; }
.tip { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.tip p { color: var(--muted); font-size: .92rem; }

/* Privacidade */
.privacy { list-style: none; display: grid; gap: 12px; margin: 28px 0 24px; }
.privacy li {
    background: var(--bg-alt);
    border: 1px solid var(--line);
    border-left: 4px solid var(--primary);
    border-radius: 10px;
    padding: 14px 18px;
}

/* Final */
.final { background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; }
.final p { color: rgba(255,255,255,.9); margin-bottom: 28px; }
.scale { font-size: 3rem; margin-bottom: 10px; }

.footer { padding: 34px 0; text-align: center; color: var(--muted); border-top: 1px solid var(--line); }
.footer p + p { margin-top: 4px; }

/* Responsivo */
@media (max-width: 900px) {
    .hero-grid { grid-template-columns: 1fr; }
    .steps, .sources { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
    body { font-size: 16px; }
    .hero { padding: 50px 0; }
    .section { padding: 56px 0; }
    .cards-3, .steps, .sources, .tips { grid-template-columns: 1fr; }
    .model { padding: 20px; }
    .btn-small { display: none; }
}

.social { margin-top: 14px !important; }
.social a { color: var(--primary); font-weight: 600; text-decoration: none; }
.social a:hover { text-decoration: underline; }