* {
    box-sizing: border-box;
}

html {
    font-family: Arial, Helvetica, sans-serif;
    background: #f4f6f8;
    color: #17202a;
}

body {
    margin: 0;
}

.container {
    width: min(1100px, calc(100% - 32px));
    margin: 0 auto;
}

.site-header {
    background: #111827;
    color: #fff;
    padding: 18px 0;
}

.brand {
    display: flex;
    align-items: center;
    gap: 14px;
}

.brand-mark {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 58px;
    height: 58px;
    border-radius: 8px;
    background: #fff;
    color: #111827;
    font-weight: 800;
}

.brand h1 {
    margin: 0;
    font-size: 24px;
}

.brand p {
    margin: 4px 0 0;
    opacity: 0.75;
    font-size: 14px;
}

.hero {
    margin-top: 60px;
    padding: 50px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 18px rgba(0, 0, 0, 0.08);
}

.hero h2 {
    margin-top: 0;
    font-size: 34px;
}

.hero p {
    max-width: 700px;
    font-size: 18px;
    line-height: 1.6;
}

.actions {
    display: flex;
    gap: 12px;
    margin-top: 28px;
    flex-wrap: wrap;
}

.button {
    display: inline-block;
    padding: 12px 18px;
    border-radius: 7px;
    text-decoration: none;
    font-weight: 700;
}

.button.primary {
    background: #111827;
    color: #fff;
}

.button.secondary {
    background: #e5e7eb;
    color: #111827;
}

.error-page {
    margin-top: 80px;
    background: #fff;
    padding: 40px;
    border-radius: 12px;
}