:root {
    --accent: #2f7df6;
    --accent-soft: rgba(47, 125, 246, 0.12);
    --bg: #ffffff;
    --bg-elevated: #f6f8fb;
    --text: #15181d;
    --text-soft: #5a6473;
    --border: #e6e9ef;
    --radius: 18px;
    --maxw: 760px;
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root {
        --accent: #5b9bff;
        --accent-soft: rgba(91, 155, 255, 0.16);
        --bg: #0f1216;
        --bg-elevated: #171b21;
        --text: #f2f4f8;
        --text-soft: #9aa4b2;
        --border: #262c34;
    }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    font-size: 17px;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 0 22px;
}

/* Header / nav */
.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    backdrop-filter: saturate(180%) blur(14px);
    -webkit-backdrop-filter: saturate(180%) blur(14px);
    background: color-mix(in srgb, var(--bg) 82%, transparent);
    border-bottom: 1px solid var(--border);
}
.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}
.brand {
    display: flex;
    align-items: center;
    gap: 9px;
    font-weight: 700;
    font-size: 18px;
    color: var(--text);
}
.brand:hover { text-decoration: none; }
.brand .dot {
    width: 26px; height: 26px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--accent), #7b5bff);
    display: inline-block;
}
.nav-links { display: flex; gap: 20px; font-size: 15px; }
.nav-links a { color: var(--text-soft); font-weight: 500; }
.nav-links a:hover { color: var(--text); text-decoration: none; }

/* Hero */
.hero {
    text-align: center;
    padding: 84px 0 64px;
}
.hero h1 {
    font-size: clamp(36px, 7vw, 56px);
    line-height: 1.05;
    margin: 0 0 16px;
    letter-spacing: -0.02em;
}
.hero .tagline {
    font-size: clamp(18px, 3.4vw, 22px);
    color: var(--text-soft);
    max-width: 540px;
    margin: 0 auto 30px;
}
.btn {
    display: inline-block;
    background: var(--accent);
    color: #fff;
    padding: 13px 26px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 16px;
}
.btn:hover { text-decoration: none; opacity: 0.92; }
.btn.secondary {
    background: var(--accent-soft);
    color: var(--accent);
}

/* Sections */
section { padding: 30px 0; }
h2 {
    font-size: clamp(24px, 4vw, 30px);
    letter-spacing: -0.01em;
    margin: 0 0 22px;
}
h3 { font-size: 19px; margin: 28px 0 8px; }

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
}
.card {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px;
}
.card .emoji { font-size: 28px; display: block; margin-bottom: 10px; }
.card h3 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--text-soft); font-size: 15px; }

.banner {
    background: var(--accent-soft);
    border-radius: var(--radius);
    padding: 28px;
    text-align: center;
}
.banner h2 { margin: 0 0 8px; }
.banner p { margin: 0; color: var(--text-soft); }

/* Doc / legal pages */
.doc h1 { font-size: clamp(30px, 6vw, 42px); margin: 56px 0 6px; letter-spacing: -0.02em; }
.doc .updated { color: var(--text-soft); font-size: 14px; margin: 0 0 30px; }
.doc h2 { font-size: 21px; margin: 34px 0 8px; }
.doc p, .doc li { color: var(--text-soft); }
.doc ul { padding-left: 20px; }
.doc li { margin: 4px 0; }
.doc strong { color: var(--text); }

/* FAQ */
.faq details {
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 4px 18px;
    margin: 10px 0;
    background: var(--bg-elevated);
}
.faq summary {
    cursor: pointer;
    font-weight: 600;
    padding: 14px 0;
    list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; float: right; color: var(--text-soft); font-weight: 400; }
.faq details[open] summary::after { content: "\2013"; }
.faq details p { margin: 0 0 16px; }

.contact-box {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin: 6px 0 30px;
}
.contact-box p { margin: 0 0 6px; }

/* Footer */
.site-footer {
    border-top: 1px solid var(--border);
    margin-top: 60px;
    padding: 30px 0 50px;
    text-align: center;
    color: var(--text-soft);
    font-size: 14px;
}
.site-footer .links { margin-bottom: 10px; display: flex; gap: 18px; justify-content: center; flex-wrap: wrap; }
.site-footer a { color: var(--text-soft); }