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

body, html {
  height: 100%;
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(to bottom right, #f8f9fb, #eaf3ff);
  color: #2e2e2e;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
  padding-bottom: 120px;
}

.nexus-header {
  background: linear-gradient(to right, #0057b8, #00c6ff);
  color: white;
  font-size: 22px;
  font-weight: bold;
  padding: 16px;
  text-align: center;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.version {
  font-size: 14px;
  margin-left: 8px;
  opacity: 0.8;
}

.runner-card {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  background: rgba(255, 255, 255, 0.8);
  padding: 20px;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
  backdrop-filter: blur(6px);
}

.editor, .output {
  flex: 1 1 400px;
  display: flex;
  flex-direction: column;
  min-height: 300px;
}

textarea#code {
  width: 100%;
  padding: 20px;
  font-size: 15px;
  font-family: 'Fira Code', monospace;
  border: 1px solid #ccc;
  border-radius: 10px;
  background: #fdfdfd;
  resize: vertical;
  min-height: 400px;
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.03);
  color: #333;
}

#output {
  background: #1e1e1e;
  color: #f4f4f4;
  padding: 20px;
  border-radius: 10px;
  font-family: 'Fira Code', monospace;
  font-size: 15px;
  white-space: pre-wrap;
  overflow-y: auto;
  flex: 1;
  min-height: 400px;
}

#loading-message {
  color: #007bff;
  font-weight: bold;
  display: none;
  margin-bottom: 10px;
}

input[type="text"] {
  margin-top: 10px;
  padding: 10px;
  font-family: monospace;
  background: #2a2a2a;
  color: white;
  border-radius: 6px;
  border: 1px solid #444;
}

/* Buttons */
.button-group.fixed-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: 12px 20px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(6px);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
  z-index: 999;
}

.run-btn {
  padding: 10px 18px;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  transition: background 0.3s ease;
  background: linear-gradient(to right, #007bff, #00c6ff);
  color: white;
}

.run-btn:hover {
  background: linear-gradient(to right, #0056b3, #00aaff);
}

/* Responsive Design */
@media (max-width: 768px) {
  .runner-card {
    flex-direction: column;
  }

  .run-btn {
    width: 100%;
  }

  .button-group.fixed-footer {
    flex-direction: column;
    padding: 15px;
  }

  textarea#code, #output {
    min-height: 250px;
    font-size: 14px;
  }
}

/* Hide mobile menu by default */
.mobile-dropdown {
  display: none;
  width: 100%;
}

.mobile-dropdown .toggle-menu-btn {
  width: 100%;
}

.mobile-dropdown .dropdown-content {
  display: none;
  flex-direction: column;
  gap: 10px;
  margin-top: 10px;
  background: rgba(255, 255, 255, 0.95);
  padding: 10px;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  animation: fadeIn 0.3s ease-in-out;
}

.mobile-dropdown .dropdown-content button {
  width: 100%;
}

/* Animation */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Hide desktop buttons on mobile */
@media (max-width: 768px) {
  .desktop-buttons {
    display: none;
  }

  .mobile-dropdown {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
}

/* Stylish Mobile Dropdown Button */
.mobile-dropdown .toggle-menu-btn {
  background: linear-gradient(to right, #007bff, #00c6ff);
  color: #fff;
  font-weight: 600;
  padding: 12px 16px;
  border: none;
  border-radius: 10px;
  font-size: 16px;
  width: 100%;
  text-align: center;
  box-shadow: 0 4px 10px rgba(0, 123, 255, 0.2);
  transition: background 0.3s ease;
}

.mobile-dropdown .toggle-menu-btn:hover {
  background: linear-gradient(to right, #0056b3, #00aaff);
}

/* Enhanced Dropdown Menu Styles */
.mobile-dropdown .dropdown-content {
  display: none;
  flex-direction: column;
  gap: 12px;
  margin-top: 12px;
  background: linear-gradient(to bottom right, #ffffff, #f0f9ff);
  padding: 15px;
  border-radius: 12px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
  width: 100%;
  animation: fadeIn 0.25s ease-out;
}

.mobile-dropdown .dropdown-content button {
  background: linear-gradient(to right, #007bff, #00c6ff);
  color: #fff;
  border: none;
  padding: 10px 14px;
  font-size: 15px;
  border-radius: 8px;
  font-weight: 600;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
  transition: background 0.3s ease;
  cursor: pointer;
}

.mobile-dropdown .dropdown-content button:hover {
  background: linear-gradient(to right, #0056b3, #00aaff);
}

@media (min-width: 1025px) {
  .container {
    max-width: 100%;
    padding: 40px 60px 140px;
  }

  .runner-card {
    gap: 40px;
    padding: 30px 40px;
    border-radius: 24px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
  }

  .editor, .output {
    min-height: 500px;
  }

  textarea#code {
    min-height: 500px;
    font-size: 16px;
    padding: 24px;
    border-radius: 12px;
    box-shadow: inset 0 3px 8px rgba(0, 0, 0, 0.04);
  }

  #output {
    min-height: 500px;
    padding: 24px;
    border-radius: 12px;
    font-size: 16px;
    box-shadow: inset 0 3px 8px rgba(255, 255, 255, 0.03);
  }

  .nexus-header {
    font-size: 26px;
    padding: 24px 0;
  }

  .version {
    font-size: 16px;
  }

  .button-group.fixed-footer {
    padding: 18px 40px;
  }
}

@media (min-width: 1025px) {
  html, body {
    height: 100%;
  }

  .container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 100%;
    padding: 40px 60px 140px; /* Leave room for fixed footer */
  }

  .runner-card {
    flex: 1;
    display: flex;
    flex-direction: row;
    gap: 40px;
    padding: 30px 40px;
    border-radius: 24px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
  }

  .editor, .output {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: auto;
  }

  textarea#code,
  #output {
    flex: 1;
    height: 100%;
    min-height: 100%;
    padding: 24px;
    font-size: 16px;
    border-radius: 12px;
    box-shadow: inset 0 3px 8px rgba(0, 0, 0, 0.04);
  }

  .button-group.fixed-footer {
    padding: 18px 40px;
  }
}

@media (max-width: 768px) {
  .runner-card {
    gap: 10px; /* reduce vertical spacing */
    padding: 15px;
  }

  .editor, .output {
    min-height: auto;
  }

  textarea#code,
  #output {
    min-height: 180px; /* reduce from 250px or 400px */
    padding: 16px;
    font-size: 14px;
  }
}

.scroll-buttons {
  display: none;
}

@media (max-width: 768px) {
  .scroll-buttons {
    position: fixed;
    bottom: 90px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 999;
  }

  .scroll-buttons button {
    background: linear-gradient(to right, #007bff, #00c6ff);
    color: white;
    border: none;
    padding: 10px 14px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: bold;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
    cursor: pointer;
    transition: background 0.3s ease;
  }

  .scroll-buttons button:hover {
    background: linear-gradient(to right, #0056b3, #00aaff);
  }
}