Here is a complete, consolidated `styles.css` file combining standard styles for `bedfordrowingevents.co.uk` (layout reset, typography, buttons, tables, and content styling) along with the black band header and responsive mobile navigation menu styles.

```css
/* ==========================================================================
   1. GLOBAL RESETS & TYPOGRAPHY
   ========================================================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #333333;
  background-color: #f8f9fa;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
  color: #111111;
  margin-bottom: 1rem;
  font-weight: 700;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.6rem; border-bottom: 2px solid #00aaff; padding-bottom: 5px; }
h3 { font-size: 1.3rem; }

p {
  margin-bottom: 1rem;
}

a {
  color: #0066cc;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ==========================================================================
   2. HEADER & NAVIGATION (BLACK BAND & HAMBURGER)
   ========================================================================== */
.site-header {
  background-color: #000000;
  color: #ffffff;
  width: 100%;
  position: relative;
  z-index: 1000;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo img {
  height: 45px;
  width: auto;
  display: block;
}

/* Navigation Links (Desktop) */
.nav-menu ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 24px;
}

.nav-menu a {
  color: #ffffff;
  text-decoration: none;
  font-family: Arial, sans-serif;
  font-size: 1rem;
  font-weight: 600;
  transition: color 0.2s ease-in-out;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: #00aaff;
  text-decoration: none;
}

/* Hamburger Toggle Button */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 30px;
  height: 24px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 1001;
}

.menu-toggle .bar {
  width: 100%;
  height: 3px;
  background-color: #ffffff;
  border-radius: 2px;
  transition: all 0.3s ease-in-out;
}

/* Hamburger animation to 'X' */
.menu-toggle.open .bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}
.menu-toggle.open .bar:nth-child(2) {
  opacity: 0;
}
.menu-toggle.open .bar:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* ==========================================================================
   3. LAYOUT & MAIN CONTENT CONTAINERS
   ========================================================================== */
.main-container {
  max-width: 1200px;
  margin: 20px auto;
  padding: 0 20px;
  flex: 1;
  width: 100%;
}

.section-block {
  background: #ffffff;
  padding: 25px;
  margin-bottom: 25px;
  border-radius: 6px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* Buttons */
.btn {
  display: inline-block;
  background-color: #0066cc;
  color: #ffffff;
  padding: 10px 20px;
  border-radius: 4px;
  text-decoration: none;
  font-weight: bold;
  transition: background-color 0.2s ease;
}

.btn:hover {
  background-color: #004488;
  color: #ffffff;
  text-decoration: none;
}

/* Tables (Event Lists / Results) */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 15px 0;
}

th, td {
  padding: 12px;
  text-align: left;
  border-bottom: 1px solid #ddd;
}

th {
  background-color: #000000;
  color: #ffffff;
}

tr:nth-child(even) {
  background-color: #f2f2f2;
}

/* ==========================================================================
   4. FOOTER
   ========================================================================== */
.site-footer {
  background-color: #111111;
  color: #cccccc;
  text-align: center;
  padding: 20px 0;
  margin-top: auto;
  font-size: 0.9rem;
}

.site-footer a {
  color: #ffffff;
}

/* ==========================================================================
   5. RESPONSIVE MEDIA QUERIES (< 768px)
   ========================================================================== */
@media screen and (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: #000000;
    border-top: 1px solid #222222;
    padding: 15px 0;
  }

  .nav-menu.active {
    display: block;
  }

  .nav-menu ul {
    flex-direction: column;
    align-items: center;
    gap: 16px;
  }

  .nav-menu a {
    font-size: 1.1rem;
    display: block;
    padding: 8px 0;
  }

  .main-container {
    padding: 0 15px;
  }
}

```