:root {
  /* Modern color palette */
  --bg-color: #121212;
  --card-bg: #1e1e1e;
  --card-hover-bg: #252525;
  --text-color: #f5f5f5;
  --text-secondary: #b0b0b0;
  --accent-color: #4f46e5;
  --accent-hover: #6366f1;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;
  --header-bg: #171717;
  --border-color: #333333;
  --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);

  /* Spacing and sizes */
  --border-radius: 8px;
  --container-padding: 24px;
  --card-padding: 16px;
  --animation-speed: 0.2s;
}

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

body {
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  font-size: 16px;
  min-height: 150vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: var(--container-padding);
  flex: 1;
}

/* Header styling */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  padding: 20px;
  background-color: var(--header-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--card-shadow);
}

h1 {
  font-size: 1.8rem;
  font-weight: 700;
  background: linear-gradient(90deg, var(--accent-color), #9f7aea);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin: 0;
}

/* Button styles */
.btn {
  background-color: var(--card-bg);
  color: var(--text-color);
  border: none;
  padding: 10px 18px;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--animation-speed) ease;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 5px;
  height: 5px;
  background: rgba(255, 255, 255, 0.4);
  opacity: 0;
  border-radius: 100%;
  transform: scale(1, 1) translate(-50%, -50%);
  transform-origin: 50% 50%;
}

.btn:hover {
  background-color: var(--btn-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.btn:active::after {
  animation: ripple 0.6s ease-out;
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background-color: var(--accent-color);
  color: white;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
}

.btn-check {
  min-width: 100px;
  transition: background-color 0.2s, transform 0.1s, box-shadow 0.2s;
}

.btn-check:hover {
  box-shadow: 0 0 8px rgba(79, 70, 229, 0.4);
}

#saveResultsBtn {
  margin-left: 12px;
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
}

#saveResultsBtn:hover {
  border-color: var(--accent-color);
}

/* Filter section */
.filters {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  background-color: var(--header-bg);
  padding: 16px;
  border-radius: var(--border-radius);
  box-shadow: var(--card-shadow);
  flex-wrap: wrap;
  gap: 16px;
}

.filter-group, .search-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.filter-group label, .search-group label {
  font-weight: 500;
  color: var(--text-secondary);
}

select, input {
  background-color: var(--card-bg);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  padding: 10px 14px;
  border-radius: var(--border-radius);
  min-width: 200px;
  font-size: 14px;
  transition: border-color var(--animation-speed) ease, box-shadow var(--animation-speed) ease;
}

select:focus, input:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.25);
}

/* Help information */
.help-info {
  background-color: rgba(79, 70, 229, 0.1);
  border-left: 4px solid var(--accent-color);
  padding: 16px;
  border-radius: var(--border-radius);
  margin-bottom: 24px;
  font-size: 0.95rem;
  line-height: 1.6;
}

.help-info p {
  margin-bottom: 12px;
}

.help-info p:last-child {
  margin-bottom: 0;
}

.help-info strong {
  color: var(--accent-color);
}

/* Server list grid */
.server-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

/* Server cards */
.server-card {
  background-color: var(--card-bg);
  border-radius: var(--border-radius);
  padding: var(--card-padding);
  box-shadow: var(--card-shadow);
  transition: all var(--animation-speed) ease;
  border-left: 4px solid #555;
  display: flex;
  flex-direction: column;
}

.server-card:hover {
  transform: translateY(-3px);
  background-color: var(--card-hover-bg);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

.server-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.server-name {
  font-weight: 600;
  font-size: 1.1rem;
}

.server-location {
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding: 2px 6px;
  background-color: rgba(0, 0, 0, 0.2);
  border-radius: 4px;
}

.server-address {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  background-color: rgba(0, 0, 0, 0.2);
  padding: 8px 10px;
  border-radius: 4px;
  margin-bottom: 16px;
  word-break: break-all;
  font-size: 0.9rem;
  border: 1px solid var(--border-color);
}

.server-ping {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
  padding-top: 8px;
}

.ping-result {
  font-size: 1.25rem;
  font-weight: 700;
  min-width: 80px;
  display: inline-block;
  text-shadow: 0 0 8px rgba(0, 0, 0, 0.3);
}

/* Status and loading indicators */
.loading {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  font-style: italic;
  color: var(--text-secondary);
  background-color: var(--card-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--card-shadow);
}

.status-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--header-bg);
  padding: 12px 20px;
  text-align: center;
  font-size: 0.9rem;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.2);
  z-index: 100;
}

/* Ping result status colors */
.ping-good {
  color: var(--success-color);
}

.ping-medium {
  color: var(--warning-color);
}

.ping-bad {
  color: var(--danger-color);
}

.ping-testing {
  color: var(--accent-color);
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0% {
    opacity: 0.6;
  }
  50% {
    opacity: 1;
  }
  100% {
    opacity: 0.6;
  }
}

@keyframes ripple {
  0% {
    transform: scale(0, 0);
    opacity: 1;
  }
  20% {
    transform: scale(25, 25);
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: scale(40, 40);
  }
}

.disabled {
  opacity: 0.5;
  pointer-events: none;
}

/* Responsive design */
@media (max-width: 768px) {
  :root {
    --container-padding: 16px;
  }

  .server-list {
    grid-template-columns: 1fr;
  }

  header {
    flex-direction: column;
    gap: 16px;
    text-align: center;
    padding: 16px;
  }

  .filters {
    flex-direction: column;
    align-items: stretch;
  }

  .filter-group, .search-group {
    flex-direction: column;
    align-items: flex-start;
  }

  select, input {
    width: 100%;
  }

  h1 {
    font-size: 1.5rem;
  }

  #saveResultsBtn {
    margin-left: 0;
    margin-top: 12px;
  }
}

@media (max-width: 480px) {
  .server-card {
    padding: 12px;
  }

  .server-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .ping-result {
    font-size: 1.1rem;
  }

  .btn-check {
    padding: 8px 12px;
    font-size: 13px;
  }
}

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

.server-card {
  animation: fadeIn 0.3s ease-out;
}

/* Add some progressivity to card appearance */
.server-card:nth-child(1) { animation-delay: 0.05s; }
.server-card:nth-child(2) { animation-delay: 0.1s; }
.server-card:nth-child(3) { animation-delay: 0.15s; }
.server-card:nth-child(4) { animation-delay: 0.2s; }
.server-card:nth-child(5) { animation-delay: 0.25s; }
.server-card:nth-child(6) { animation-delay: 0.3s; }
.server-card:nth-child(7) { animation-delay: 0.35s; }
.server-card:nth-child(8) { animation-delay: 0.4s; }

/* Add tooltip styles for additional information */
[data-tooltip] {
  position: relative;
  cursor: help;
}

[data-tooltip]:after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 130%;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--card-bg);
  color: var(--text-color);
  padding: 8px 12px;
  border-radius: var(--border-radius);
  font-size: 0.8rem;
  white-space: nowrap;
  box-shadow: var(--card-shadow);
  opacity: 0;
  pointer-events: none;
  transition: all 0.2s ease;
  z-index: 10;
}

[data-tooltip]:hover:after {
  opacity: 1;
  bottom: 125%;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: #555;
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: #7a7a7a;
}

* {
  scrollbar-width: thin;
  scrollbar-color: #555 transparent;
}