```css
/* button-theme.css */

/*
 * Repository-wide button theme
 * Primary button color: #00FF9C
 */

:root {
  --button-green: #00FF9C;
  --button-green-hover: #00E68C;
  --button-green-active: #00CC7D;
  --button-green-border: #00CC7D;
  --button-green-text: #102A23;
  --button-green-shadow:
    0 12px 24px rgba(0, 255, 156, 0.22);
}

/*
 * Standard button elements
 */

button,
input[type="button"],
input[type="submit"],
input[type="reset"] {
  background: var(--button-green) !important;
  background-color: var(--button-green) !important;
  background-image: none !important;
  color: var(--button-green-text) !important;
  border-color: var(--button-green-border) !important;
  box-shadow: var(--button-green-shadow) !important;
}

/*
 * Links styled as buttons
 */

a.btn,
a[class*="btn"],
a.admin-link,
a.dashboard-link,
a.back-link,
a.primary-action,
a.secondary-action,
[role="button"] {
  background: var(--button-green) !important;
  background-color: var(--button-green) !important;
  background-image: none !important;
  color: var(--button-green-text) !important;
  border-color: var(--button-green-border) !important;
  box-shadow: var(--button-green-shadow) !important;
}

/*
 * Common repository button classes
 */

.btn,
.btn-primary,
.btn-secondary,
.admin-btn,
.login-btn,
.dashboard-btn,
.action-btn,
.primary-btn,
.secondary-btn,
.submit-btn,
.save-btn,
.add-btn,
.edit-btn,
.back-btn,
.logout-btn,
.article-btn,
.contact-btn {
  background: var(--button-green) !important;
  background-color: var(--button-green) !important;
  background-image: none !important;
  color: var(--button-green-text) !important;
  border-color: var(--button-green-border) !important;
  box-shadow: var(--button-green-shadow) !important;
}

/*
 * Hover state
 */

button:hover:not(:disabled),
input[type="button"]:hover:not(:disabled),
input[type="submit"]:hover:not(:disabled),
input[type="reset"]:hover:not(:disabled),
a.btn:hover,
a[class*="btn"]:hover,
a.admin-link:hover,
a.dashboard-link:hover,
a.back-link:hover,
a.primary-action:hover,
a.secondary-action:hover,
[role="button"]:hover,
.btn:hover,
.btn-primary:hover,
.btn-secondary:hover,
.admin-btn:hover:not(:disabled),
.login-btn:hover:not(:disabled),
.dashboard-btn:hover:not(:disabled),
.action-btn:hover:not(:disabled),
.primary-btn:hover:not(:disabled),
.secondary-btn:hover:not(:disabled),
.submit-btn:hover:not(:disabled),
.save-btn:hover:not(:disabled),
.add-btn:hover:not(:disabled),
.edit-btn:hover:not(:disabled),
.back-btn:hover:not(:disabled),
.logout-btn:hover:not(:disabled),
.article-btn:hover:not(:disabled),
.contact-btn:hover:not(:disabled) {
  background: var(--button-green-hover) !important;
  background-color: var(--button-green-hover) !important;
  background-image: none !important;
  color: var(--button-green-text) !important;
  border-color: var(--button-green-border) !important;
  box-shadow:
    0 16px 30px rgba(0, 255, 156, 0.32) !important;
  transform: translateY(-1px);
}

/*
 * Active state
 */

button:active:not(:disabled),
input[type="button"]:active:not(:disabled),
input[type="submit"]:active:not(:disabled),
input[type="reset"]:active:not(:disabled),
a.btn:active,
a[class*="btn"]:active,
[role="button"]:active,
.btn:active,
.admin-btn:active:not(:disabled) {
  background: var(--button-green-active) !important;
  background-color: var(--button-green-active) !important;
  box-shadow:
    0 8px 16px rgba(0, 255, 156, 0.24) !important;
  transform: translateY(0);
}

/*
 * Keyboard focus
 */

button:focus-visible,
input[type="button"]:focus-visible,
input[type="submit"]:focus-visible,
input[type="reset"]:focus-visible,
a.btn:focus-visible,
a[class*="btn"]:focus-visible,
a.admin-link:focus-visible,
[role="button"]:focus-visible,
.btn:focus-visible,
.admin-btn:focus-visible {
  outline:
    3px solid rgba(0, 255, 156, 0.42) !important;
  outline-offset: 3px;
}

/*
 * Disabled state
 */

button:disabled,
input[type="button"]:disabled,
input[type="submit"]:disabled,
input[type="reset"]:disabled,
.btn:disabled,
.admin-btn:disabled,
.login-btn:disabled,
.dashboard-btn:disabled,
.action-btn:disabled,
.primary-btn:disabled,
.secondary-btn:disabled,
.submit-btn:disabled,
.save-btn:disabled,
.add-btn:disabled,
.edit-btn:disabled,
.logout-btn:disabled {
  background: var(--button-green) !important;
  background-color: var(--button-green) !important;
  background-image: none !important;
  color: var(--button-green-text) !important;
  border-color: var(--button-green-border) !important;
  box-shadow: none !important;
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}
```