:root {
    --navy: #151837;
    --navy-deep: #0e1027;
    --navy-card: #1d2148;
    --navy-border: rgba(255, 255, 255, 0.08);
    --blue: #4b6fdd;
    --blue-bright: #6b8eff;
    --blue-soft: #8bb7ff;
    --text: #f5f7ff;
    --text-muted: #a4acc9;
    --radius-lg: 20px;
    --radius-md: 14px;
    --max-width: 1040px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display",
        "Inter", system-ui, sans-serif;
    background: var(--navy);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    background-image:
        radial-gradient(ellipse 900px 600px at 50% -10%, rgba(75, 111, 221, 0.22), transparent 60%),
        radial-gradient(ellipse 700px 500px at 85% 30%, rgba(107, 142, 255, 0.10), transparent 60%);
    background-attachment: fixed;
}

a {
    color: var(--blue-bright);
    text-decoration: none;
    transition: color 0.15s ease;
}

a:hover {
    color: var(--blue-soft);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- Nav ---------- */
nav {
    padding: 28px 0;
    border-bottom: 1px solid var(--navy-border);
    position: sticky;
    top: 0;
    background: rgba(21, 24, 55, 0.85);
    backdrop-filter: saturate(140%) blur(12px);
    -webkit-backdrop-filter: saturate(140%) blur(12px);
    z-index: 10;
}

nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--text);
}

.brand img {
    width: 34px;
    height: 34px;
    border-radius: 8px;
}

.nav-links {
    display: flex;
    gap: 28px;
    font-size: 15px;
    font-weight: 500;
}

.nav-links a {
    color: var(--text-muted);
}

.nav-links a:hover {
    color: var(--text);
}

/* ---------- Hero ---------- */
.hero {
    text-align: center;
    padding: 96px 0 64px;
}

.hero img.icon {
    width: 120px;
    height: 120px;
    border-radius: 26px;
    box-shadow:
        0 20px 60px rgba(0, 0, 0, 0.4),
        0 0 0 1px var(--navy-border);
    margin-bottom: 32px;
}

.hero h1 {
    font-size: clamp(40px, 6vw, 68px);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.05;
    margin-bottom: 20px;
    background: linear-gradient(180deg, #ffffff 0%, #b8c4ff 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero .tagline {
    font-size: clamp(18px, 2.2vw, 22px);
    color: var(--text-muted);
    max-width: 560px;
    margin: 0 auto 40px;
}

.cta {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 28px;
    background: var(--blue);
    color: white;
    border-radius: 999px;
    font-weight: 600;
    font-size: 16px;
    transition: transform 0.15s ease, background 0.15s ease;
    box-shadow: 0 10px 30px rgba(75, 111, 221, 0.35);
}

.cta:hover {
    background: var(--blue-bright);
    color: white;
    transform: translateY(-1px);
}

.cta.secondary {
    background: transparent;
    box-shadow: 0 0 0 1px var(--navy-border) inset;
    color: var(--text);
}

.cta.secondary:hover {
    background: rgba(255, 255, 255, 0.04);
    color: var(--text);
}

.cta-row {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ---------- Features ---------- */
.features {
    padding: 72px 0;
}

.section-label {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--blue-soft);
    margin-bottom: 12px;
    text-align: center;
}

.section-title {
    font-size: clamp(28px, 4vw, 44px);
    font-weight: 700;
    letter-spacing: -0.02em;
    text-align: center;
    margin-bottom: 48px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.feature-card {
    background: var(--navy-card);
    border: 1px solid var(--navy-border);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: transform 0.18s ease, border-color 0.18s ease;
}

.feature-card:hover {
    transform: translateY(-2px);
    border-color: rgba(107, 142, 255, 0.3);
}

.feature-card .icon-badge {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--blue), var(--blue-bright));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 19px;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 15px;
}

/* ---------- Footer ---------- */
footer {
    padding: 48px 0 32px;
    border-top: 1px solid var(--navy-border);
    margin-top: 72px;
}

footer .container {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    justify-content: space-between;
    align-items: center;
}

footer .copyright {
    color: var(--text-muted);
    font-size: 14px;
}

footer .footer-links {
    display: flex;
    gap: 24px;
    font-size: 14px;
}

footer .footer-links a {
    color: var(--text-muted);
}

footer .footer-links a:hover {
    color: var(--text);
}

/* ---------- Article pages (support / privacy) ---------- */
.page {
    padding: 72px 0 48px;
    max-width: 720px;
}

.page h1 {
    font-size: clamp(34px, 5vw, 48px);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

.page .subtitle {
    color: var(--text-muted);
    font-size: 17px;
    margin-bottom: 40px;
}

.page h2 {
    font-size: 22px;
    font-weight: 700;
    margin: 36px 0 12px;
    letter-spacing: -0.01em;
}

.page p {
    color: var(--text-muted);
    margin-bottom: 14px;
    font-size: 16px;
}

.page ul {
    color: var(--text-muted);
    padding-left: 22px;
    margin-bottom: 14px;
}

.page li {
    margin-bottom: 6px;
}

.page .card {
    background: var(--navy-card);
    border: 1px solid var(--navy-border);
    border-radius: var(--radius-md);
    padding: 24px;
    margin: 24px 0;
}

.page strong {
    color: var(--text);
}

@media (max-width: 640px) {
    .hero {
        padding: 64px 0 48px;
    }

    .hero img.icon {
        width: 96px;
        height: 96px;
    }

    .features {
        padding: 56px 0;
    }

    footer .container {
        flex-direction: column;
        text-align: center;
    }
}