body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: rgb(0, 0, 0);
    font-family: Arial, sans-serif;
  }
  
  header {
    margin-top: 20px;
    width: 100%;
    padding: 1rem 9%;
    justify-content: space-between;
    filter: drop-shadow(10px);
    align-items: center;
    z-index: 100;
    animation: fadeIn 1.5s ease-out;
  }
  
  .navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    position: fixed;
    top: 0; /* Ensure it's at the very top */
    left: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 1000; 
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
    box-sizing: border-box;
    margin: 0; /* Remove any margin */
}
  
  .logo {
    margin-left: 10px;
    height: 40px;
    max-width: 80px;
    transition: transform 0.3s ease, filter 0.3s ease;
  }
  
  .logo:hover {
    transform: scale(1.1);
    filter: brightness(1.2);
  }
  
  /* Menu Links */
  .menu-links {
    list-style: none;
    display: flex;
    justify-content: center;
    padding: 0;
    gap: 15px;
    font-size: 16px;
    flex-wrap: wrap;
    margin-right: 10px;
    transition: all 0.3s ease;
  }
  
  .menu-links a {
    text-decoration: none;
    color: white;
    font-size: 1rem;
    padding: 7px 12px;
    border-radius: 5px;
    transition: background-color 0.3s ease, transform 0.4s ease;
    white-space: nowrap;
  }
  
  .menu-links a:hover {
    background-color: #353535;
    transform: scale(1.05);
  }
  
  .menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 25px;
    cursor: pointer;
    z-index: 1001;
  }
  
  .menu-toggle .bar {
    height: 3px;
    width: 100%;
    background: #fff;
    transition: 0.3s ease;
    border-radius: 5px;
  }
  
  .clock-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    margin-top: 60px;
    width: 100%;
    max-width: 1200px;
    box-sizing: border-box;
  }
  
  .clock {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
  }
  
  .unit {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 0 5px;
  }
  
  .unit-label {
    margin-top: 10px;
    font-size: 14px;
    color: #777;
    margin-bottom: 15px;
  }
  
  .flip-card {
    position: relative;
    width: 120px;
    height: 160px;
    border-radius: 10px;
    background-color: #333;
    color: white;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    perspective: 1000px;
    margin: 5px;
    overflow: hidden;
  }
  
  .flip-card-front,
  .flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 120px;
    font-weight: bold;
    backface-visibility: hidden;
  }
  
  .flip-card-front {
    background-color: #333;
  }
  
  .flip-card-back {
    background-color: #333;
    transform: rotateX(180deg);
  }
  
  .flip-card.flipping .flip-card-inner {
    transform: rotateX(180deg);
    transition: transform 0.5s;
  }
  
  .flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
  }
  
  .flip-card::after {
    content: "";
    position: absolute;
    width: 100%;
    height: 2px;
    background-color: rgba(0, 0, 0, 0.2);
    top: 50%;
    left: 0;
  }
  
  .am-pm {
    position: relative;
    width: 120px;
    height: 160px;
    border-radius: 10px;
    background-color: #333;
    color: white;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    margin: 5px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 60px;
    font-weight: bold;
  }
  
  .am-pm::after {
    content: "";
    position: absolute;
    width: 100%;
    height: 2px;
    background-color: rgba(0, 0, 0, 0.2);
    top: 50%;
    left: 0;
  }
  
  .separator {
    font-size: 120px;
    font-weight: bold;
    margin: 0 -5px;
    color: #3d3d3d;
  }
  
  .time-zone {
    margin-top: 20px;
    font-size: 18px;
    color: #555;
    font-weight: bold;
  }
  
  .hour-container,
  .minute-container,
  .second-container {
    display: flex;
  }
  
  /* Additional styles specifically for the stopwatch page */
  .controls {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-top: 20px;
  }
  
  .control-btn {
    padding: 12px 25px;
    font-size: 16px;
    border: none;
    border-radius: 8px;
    background-color: #333;
    color: white;
    cursor: pointer;
    transition: background-color 0.3s;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  }
  
  .control-btn:hover {
    background-color: #444;
  }
  
  .control-btn:active {
    transform: translateY(2px);
  }
  
  .control-btn.start {
    background-color: #336633;
  }
  
  .control-btn.start:hover {
    background-color: #408040;
  }
  
  .control-btn.stop {
    background-color: #993333;
  }
  
  .control-btn.stop:hover {
    background-color: #b03333;
  }
  
  .control-btn.reset {
    background-color: #333366;
  }
  
  .control-btn.reset:hover {
    background-color: #404080;
  }
  
  .milliseconds-container {
    display: flex;
  }
  
  .milliseconds-card {
    position: relative;
    width: 80px;
    height: 120px;
    border-radius: 10px;
    background-color: #333;
    color: white;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    perspective: 1000px;
    margin: 5px;
    overflow: hidden;
  }
  
  .milliseconds-card::after {
    content: "";
    position: absolute;
    width: 100%;
    height: 2px;
    background-color: rgba(0, 0, 0, 0.2);
    top: 50%;
    left: 0;
  }
  
  .milliseconds-card-front,
  .milliseconds-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 80px;
    font-weight: bold;
    backface-visibility: hidden;
    background-color: #333;
  }
  
  .milliseconds-card-back {
    transform: rotateX(180deg);
  }
  
  .milliseconds-card.flipping .milliseconds-card-inner {
    transform: rotateX(180deg);
    transition: transform 0.3s;
  }
  
  .milliseconds-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
  }
  
  .Fullscreen {
    position: fixed;
    bottom: 20px;
    left: 20px;
    color: #ffffff;
    background-color: #333;
    border-radius: 5px;
    border: none;
    width: 100px;
    height: 40px;
    transition: all 0.5s ease;
    display: block;
    z-index: 100;
  }
  
  .Fullscreen:hover {
    transform: scale(1.1);
  }
  
  .noFullscreen {
    position: fixed;
    bottom: 20px;
    left: 20px;
    color: transparent;
    background-color: transparent;
    border-radius: 5px;
    border: none;
    width: 100px;
    height: 40px;
    transition: all 0.5s ease;
    display: none;
    z-index: 100;
  }
  
  .noFullscreen:hover {
    transform: scale(1.1);
    color: #ffffff;
    background-color: #333;
  }
  
  .timer-input {
    margin-bottom: 15px;
    font-size: 18px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
  }
  
  .input-hours,
  .input-minutes,
  .input-seconds {
    border-radius: 10px;
    font-size: 18px;
    text-align: center;
    padding: 8px;
    width: 60px;
    border: 1px solid #555;
    background-color: #222;
    color: white;
  }
  
  .timer-input label {
    margin-right: 5px;
  }
  
  /* Mobile menu active state */
  .menu-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 60px;
    left: 0;
    width: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    padding: 20px 0;
    text-align: center;
  }
  
  .menu-toggle.active .bar:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
  }
  
  .menu-toggle.active .bar:nth-child(2) {
    opacity: 0;
  }
  
  .menu-toggle.active .bar:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
  }
  
  /* Responsive styles */
  @media (max-width: 1024px) {
    .flip-card {
      width: 100px;
      height: 140px;
    }
  
    .milliseconds-card {
      width: 70px;
      height: 100px;
    }
  
    .am-pm {
      width: 100px;
      height: 140px;
      font-size: 50px;
    }
  
    .flip-card-front,
    .flip-card-back {
      font-size: 100px;
    }
  
    .milliseconds-card-front,
    .milliseconds-card-back {
      font-size: 70px;
    }
  
    .separator {
      font-size: 100px;
    }
  }
  
  @media (max-width: 768px) {
    .menu-toggle {
      display: flex;
    }
  
    .menu-links {
      display: none;
    }
  
    .flip-card {
      width: 80px;
      height: 120px;
    }
  
    .milliseconds-card {
      width: 60px;
      height: 90px;
    }
  
    .am-pm {
      width: 80px;
      height: 120px;
      font-size: 40px;
    }
  
    .flip-card-front,
    .flip-card-back {
      font-size: 80px;
    }
  
    .milliseconds-card-front,
    .milliseconds-card-back {
      font-size: 60px;
    }
  
    .separator {
      font-size: 80px;
    }
  
    .clock {
      gap: 5px;
    }
  
    .unit {
      margin: 0 2px;
    }
  
    .control-btn {
      padding: 10px 20px;
      font-size: 14px;
    }
  }
  
  @media (max-width: 480px) {
    .flip-card {
      width: 60px;
      height: 90px;
    }
  
    .milliseconds-card {
      width: 45px;
      height: 70px;
    }
  
    .am-pm {
      width: 60px;
      height: 90px;
      font-size: 30px;
    }
  
    .flip-card-front,
    .flip-card-back {
      font-size: 60px;
    }
  
    .milliseconds-card-front,
    .milliseconds-card-back {
      font-size: 45px;
    }
  
    .separator {
      font-size: 60px;
      margin: 0 -8px;
    }
  
    .unit-label {
      font-size: 12px;
    }
  
    .time-zone {
      font-size: 14px;
    }
  
    .control-btn {
      padding: 8px 16px;
      font-size: 14px;
    }
  
    .timer-input {
      font-size: 16px;
      flex-direction: column;
      align-items: center;
    }
  
    .timer-input label {
      display: block;
      margin-bottom: 5px;
    }
  }
  
  @media (max-width: 360px) {
    .flip-card {
      width: 50px;
      height: 75px;
    }
  
    .milliseconds-card {
      width: 40px;
      height: 60px;
    }
  
    .am-pm {
      width: 50px;
      height: 75px;
      font-size: 25px;
    }
  
    .flip-card-front,
    .flip-card-back {
      font-size: 50px;
    }
  
    .milliseconds-card-front,
    .milliseconds-card-back {
      font-size: 40px;
    }
  
    .separator {
      font-size: 50px;
      margin: 0 -10px;
    }
  
    .controls {
      gap: 10px;
    }
  
    .control-btn {
      padding: 8px 12px;
      font-size: 12px;
    }
  }
  
  /* Add these styles for the theme page */
  .theme-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    margin-top: 60px; /* Account for fixed navbar */
  }
  
  .theme-header {
    text-align: center;
    margin-bottom: 3rem;
  }
  
  .theme-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
  }
  
  .theme-header p {
    font-size: 1.1rem;
    color: var(--text-color);
    opacity: 0.8;
  }
  
  .theme-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
  }
  
  .theme-card {
    background: var(--card-color);
    border-radius: 12px;
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 3px solid transparent;
    position: relative;
    overflow: hidden;
  }
  
  .theme-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
  }
  
  .theme-card.active {
    border-color: var(--accent-color);
  }
  
  .theme-card.active::before {
    content: "✓";
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--accent-color);
    color: white;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
  }
  
  .theme-name {
    font-size: 1.2rem;
    font-weight: bold;
    margin-bottom: 1rem;
    color: var(--text-color);
  }
  
  .theme-description {
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.8;
    margin-bottom: 1.5rem;
  }
  
  .theme-colors {
    display: flex;
    gap: 8px;
    margin-bottom: 1.5rem;
  }
  
  .color-dot {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.1);
  }
  
  .theme-preview-header {
    height: 40px;
    background: var(--navbar-bg);
    border-radius: 8px;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    padding: 0 1rem;
  }
  
  .theme-preview-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-color);
    margin-right: 6px;
    opacity: 0.5;
  }
  
  .theme-preview-content {
    background: var(--background-color);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
  }
  
  .theme-preview-block {
    height: 20px;
    background: var(--control-bg-color);
    border-radius: 4px;
    margin-bottom: 8px;
  }
  
  .theme-preview-block:last-child {
    width: 60%;
  }
  
  .theme-preview-button {
    background: var(--accent-color);
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 6px;
    font-size: 1rem;
    cursor: pointer;
    transition: opacity 0.3s ease;
    width: 100%;
    
  }
  
  .theme-preview-button:hover {
    opacity: 0.9;
  }
  
  /* Animation for theme change */
  .theme-transition {
    animation: themeChange 0.5s ease;
  }
  
  @keyframes themeChange {
    0% {
      opacity: 0.5;
      transform: scale(0.98);
    }
    100% {
      opacity: 1;
      transform: scale(1);
    }
  }
  
  /* Responsive adjustments for theme page */
  @media (max-width: 768px) {
    .theme-container {
      padding: 1rem;
    }
  
    .theme-header h1 {
      font-size: 2rem;
    }
  
    .theme-grid {
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 1rem;
    }
  
    .theme-card {
      padding: 1.2rem;
    }
  }
  
  @media (max-width: 480px) {
    .theme-header h1 {
      font-size: 1.75rem;
    }
  
    .theme-header p {
      font-size: 1rem;
    }
  
    .theme-card {
      padding: 1rem;
    }
  
    .theme-name {
      font-size: 1.1rem;
    }
  
    .theme-description {
      font-size: 0.85rem;
    }
  }