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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: #1a1a1a;
    background-color: #fff;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.hero {
    position: relative;
    background: #0b0f14 url("/about/banner.png") center center / cover no-repeat;
    min-height: 340px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 1;
}

.top-nav {
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    z-index: 3;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.75rem;
    padding: 0.75rem 0.75rem 1.5rem 1.5rem;
    background: linear-gradient(to bottom, rgba(0,0,0,0.55), rgba(0,0,0,0.15), rgba(0,0,0,0));
}

.nav-links {
    display: flex;
    gap: 0.25rem;
}

.nav-link {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    padding: 0.15rem 0.5rem;
    border-bottom: 2px solid transparent;
    transition: color 0.15s ease, border-color 0.15s ease;
}

.nav-link:hover {
    color: #fff;
}

.nav-link.active {
    color: #fff;
    border-bottom-color: #2563eb;
}

.lang-flags {
    display: flex;
    gap: 0.5rem;
}

.lang-flag {
    font-size: 1.75rem;
    line-height: 1;
    text-decoration: none;
    opacity: 0.6;
    transition: opacity 0.15s ease;
}

.lang-flag:hover,
.lang-flag.active {
    opacity: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 3rem 1.25rem;
    max-width: 720px;
}

.hero-content h1 {
    color: #fff;
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 0.75rem;
}

.hero-content .subtitle {
    color: rgba(255, 255, 255, 0.88);
    font-size: 1.05rem;
    font-weight: 400;
    margin-bottom: 1.5rem;
}

.cta {
    display: inline-block;
    padding: 0.75rem 1.75rem;
    background: #2563eb;
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 6px;
    transition: background 0.15s ease;
}

.cta:hover {
    background: #1d4ed8;
}

main {
    max-width: 680px;
    margin: 0 auto;
    padding: 2rem 1.25rem 3rem;
}

.intro {
    margin-bottom: 1rem;
}

.intro p {
    font-size: 1.05rem;
    color: #333;
}

section {
    margin-bottom: 2.25rem;
}

h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: #111;
    margin-bottom: 0.6rem;
    padding-top: 0.25rem;
}

section p {
    color: #333;
    font-size: 0.975rem;
}

section p + p {
    margin-top: 0.5rem;
}

.features,
.steps {
    padding-left: 1.25rem;
    color: #333;
    font-size: 0.975rem;
}

.features li,
.steps li {
    margin-bottom: 0.5rem;
    line-height: 1.55;
}

.features a,
.steps a {
    color: #2563eb;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.features a:hover,
.steps a:hover {
    color: #1d4ed8;
}

dl {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

dt {
    font-weight: 600;
    font-size: 0.975rem;
    color: #111;
}

dd {
    margin-top: 0.25rem;
    font-size: 0.975rem;
    color: #333;
    line-height: 1.55;
}

.disclaimer {
    border-top: 1px solid #ddd;
    padding-top: 1.5rem;
    margin-top: 2.5rem;
}

.disclaimer p {
    font-size: 0.875rem;
    color: #666;
}

footer {
    text-align: center;
    padding: 1.5rem 1.25rem;
    border-top: 1px solid #eee;
    color: #888;
    font-size: 0.8rem;
}

:focus-visible {
    outline: 2px solid #2563eb;
    outline-offset: 2px;
}

@media (min-width: 640px) {
    .hero {
        min-height: 400px;
    }

    .hero-content h1 {
        font-size: 2.25rem;
    }

    .hero-content .subtitle {
        font-size: 1.15rem;
    }

    main {
        padding: 3rem 2rem 4rem;
    }

    h2 {
        font-size: 1.35rem;
    }

    .top-nav {
        padding: 1rem 1.25rem 1.75rem 2rem;
        gap: 1.25rem;
    }

    .nav-link {
        font-size: 1.05rem;
        padding: 0.2rem 0.6rem;
    }

    .lang-flag {
        font-size: 2rem;
    }
}