:root {
  --primary-color: #00bcd4;
  --primary-dark: #008ba3;
  --primary-light: #62efff;
  --bg-color: #f9fcff;
  --text-color: #333333;
  --card-bg: rgba(255, 255, 255, 0.85);
  --card-border: rgba(0, 188, 212, 0.3);
  --input-bg: rgba(255, 255, 255, 0.9);
  --shadow-color: rgba(0, 0, 0, 0.1);
  --soa-text-color: #333333;
  --color-a: rgba(25, 118, 210, 0.15);
  --color-aaaa: rgba(27, 94, 32, 0.15);
  --color-cname: rgba(155, 89, 182, 0.15);
  --color-ns: rgba(241, 196, 15, 0.15);
  --color-soa: rgba(230, 126, 34, 0.15);
  --color-other: rgba(149, 165, 166, 0.15);
  --type-a: #1976d2;
  --type-aaaa: #1b5e20;
  --type-cname: #9b59b6;
  --type-ns: #f1c40f;
  --type-soa: #e67e22;
  --type-other: #95a5a6;
}

.dark-mode {
  --primary-color: #00bcd4;
  --primary-dark: #008ba3;
  --primary-light: #62efff;
  --bg-color: #000000;
  --text-color: #ffffff;
  --card-bg: rgba(30, 30, 30, 0.9);
  --card-border: rgba(0, 188, 212, 0.5);
  --input-bg: rgba(50, 50, 50, 0.9);
  --shadow-color: rgba(0, 0, 0, 0.3);
  --soa-text-color: #ffffff;
  --color-a: rgba(25, 118, 210, 0.25);
  --color-aaaa: rgba(27, 94, 32, 0.25);
  --color-cname: rgba(155, 89, 182, 0.25);
  --color-ns: rgba(241, 196, 15, 0.25);
  --color-soa: rgba(230, 126, 34, 0.25);
  --color-other: rgba(149, 165, 166, 0.25);
  --type-a: #64b5f6;
  --type-aaaa: #81c784;
  --type-cname: #ce93d8;
  --type-ns: #fff59d;
  --type-soa: #ffb74d;
  --type-other: #b0bec5;
}

html, body { height: 100%; margin: 0; padding: 0; }

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  min-height: 100vh;
  line-height: 1.6;
  background-color: var(--bg-color);
  padding: 30px 20px;
  box-sizing: border-box;
  color: var(--text-color);
  transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
  width: 100%;
  max-width: 800px;
  margin: 20px auto;
  background-color: var(--card-bg);
  border-radius: 16px;
  box-shadow: 0 4px 16px var(--shadow-color);
  padding: 30px;
  border: 1px solid var(--card-border);
  transition: background-color 0.3s ease, border-color 0.3s ease,
    box-shadow 0.3s ease;
}

@media (hover: hover) and (pointer: fine) {
  .container {
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
  }
}

h1 { color: var(--primary-color); font-weight: 600; }

.card {
  margin-bottom: 20px;
  border: none;
  box-shadow: 0 1px 6px var(--shadow-color);
  background-color: var(--card-bg);
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

@media (hover: hover) and (pointer: fine) {
  .card {
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
  }
}

.card-header {
  background-color: rgba(0, 188, 212, 0.1);
  font-weight: 600;
  padding: 12px 20px;
  border-bottom: none;
  color: var(--text-color);
  transition: background-color 0.3s ease, color 0.3s ease;
}

.form-label {
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--text-color);
}

.form-select,
.form-control {
  border-radius: 6px;
  padding: 10px;
  border: 1px solid var(--card-border);
  background-color: var(--input-bg);
  color: var(--text-color);
  transition: border-color 0.2s ease, box-shadow 0.2s ease,
    background-color 0.3s ease, color 0.3s ease;
}

.form-select:focus,
.form-control:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(0, 188, 212, 0.2);
  outline: none;
}

.btn-primary {
  background-color: var(--primary-color);
  border: none;
  border-radius: 6px;
  padding: 10px 20px;
  font-weight: 500;
  transition: background-color 0.2s ease, transform 0.15s ease;
}

.btn-primary:hover {
  background-color: var(--primary-dark);
  transform: translateY(-1px);
}

.btn-outline-primary {
  color: var(--primary-color);
  border-color: var(--primary-color);
  transition: background-color 0.2s ease, color 0.2s ease,
    border-color 0.2s ease;
}

.btn-outline-primary:hover {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
}

.btn-outline-secondary {
  color: var(--text-color);
  border-color: #6c757d;
  transition: background-color 0.2s ease, color 0.2s ease,
    border-color 0.2s ease;
}

.btn-outline-secondary:hover {
  background-color: #6c757d;
  border-color: #6c757d;
  color: white;
}

.btn-toggle {
  background-color: var(--primary-color);
  color: white;
  border: none;
  border-radius: 6px;
  padding: 10px 15px;
  font-weight: 500;
  transition: background-color 0.2s ease, transform 0.15s ease;
}

.btn-toggle:hover {
  background-color: var(--primary-dark);
  transform: translateY(-1px);
}

pre {
  background-color: rgba(0, 188, 212, 0.1);
  padding: 15px;
  border-radius: 6px;
  border: 1px solid var(--card-border);
  white-space: pre-wrap;
  word-break: break-all;
  font-family: Consolas, Monaco, 'Andale Mono', monospace;
  font-size: 14px;
  max-height: 400px;
  overflow: auto;
  color: var(--text-color);
  transition: background-color 0.3s ease, color 0.3s ease;
}

.loading {
  display: none;
  text-align: center;
  padding: 20px 0;
}

.loading-spinner {
  border: 4px solid rgba(0, 0, 0, 0.1);
  border-left: 4px solid var(--primary-color);
  border-radius: 50%;
  width: 30px;
  height: 30px;
  animation: spin 1s linear infinite;
  margin: 0 auto 10px;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.beian-info {
  text-align: center;
  font-size: 13px;
  color: var(--text-color);
}

.beian-info a {
  color: var(--primary-color);
  text-decoration: none;
  border-bottom: 1px dashed var(--primary-color);
  padding-bottom: 2px;
}

.beian-info a:hover {
  border-bottom-style: solid;
}

@media (max-width: 576px) {
  .container { padding: 20px; }
}

.error-message {
  color: #e63e00;
  margin-top: 10px;
}

.nav-tabs .nav-link {
  border-top-left-radius: 6px;
  border-top-right-radius: 6px;
  padding: 8px 16px;
  font-weight: 500;
  color: var(--text-color);
  background-color: rgba(0, 188, 212, 0.1);
  border: 1px solid var(--card-border);
  margin-right: 5px;
}

.nav-tabs .nav-link.active {
  background-color: var(--card-bg);
  border-bottom-color: var(--card-bg);
  color: var(--primary-color);
}

.tab-content {
  background-color: var(--card-bg);
  border-radius: 0 0 6px 6px;
  padding: 15px;
  border: 1px solid var(--card-border);
  border-top: none;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.result-summary {
  color: var(--text-color);
  margin-bottom: 15px;
  padding: 10px;
  background-color: rgba(0, 188, 212, 0.1);
  border-radius: 6px;
}

.result-summary strong { color: var(--text-color); }

.ip-record {
  display: table;
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 10px;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--card-border);
  contain: layout style;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.record-a { background-color: var(--color-a); border-left: 4px solid var(--type-a); }
.record-aaaa { background-color: var(--color-aaaa); border-left: 4px solid var(--type-aaaa); }
.record-cname { background-color: var(--color-cname); border-left: 4px solid var(--type-cname); }
.record-ns { background-color: var(--color-ns); border-left: 4px solid var(--type-ns); }
.record-soa { background-color: var(--color-soa); border-left: 4px solid var(--type-soa); }
.record-other { background-color: var(--color-other); border-left: 4px solid var(--type-other); }

.ip-record-row { display: table-row; }

.ip-record-cell {
  display: table-cell;
  padding: 8px 10px;
  vertical-align: middle;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  color: var(--text-color);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 0;
}

.ip-record-cell:first-child {
  width: 30%;
  font-weight: 600;
  color: var(--primary-dark);
}

.ip-record-cell:last-child { width: 70%; }

.ip-record-row:last-child .ip-record-cell { border-bottom: none; }

.ip-address {
  font-family: monospace;
  font-weight: 600;
  color: var(--text-color);
  cursor: pointer;
  position: relative;
  display: inline-block;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: color 0.15s ease;
}

.ip-address:hover { color: var(--primary-color); }

.ip-address:after {
  content: '';
  position: absolute;
  left: 100%;
  top: 0;
  opacity: 0;
  white-space: nowrap;
  font-size: 12px;
  color: var(--primary-color);
  transition: opacity 0.2s ease;
  font-family: 'Segoe UI', sans-serif;
  font-weight: normal;
}

.ip-address.copied:after { content: '已复制'; opacity: 1; }

.geo-country {
  color: var(--primary-dark);
  font-weight: 500;
  padding: 2px 6px;
  background-color: rgba(0, 188, 212, 0.1);
  border-radius: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
  display: inline-block;
}

.geo-as {
  color: var(--primary-color);
  padding: 2px 6px;
  background-color: rgba(0, 188, 212, 0.1);
  border-radius: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
  display: inline-block;
}

.geo-blocked {
  color: #ffffff;
  background-color: #dc3545;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
  display: inline-block;
  animation: pulse-red 2s ease-out 3;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

@keyframes pulse-red {
  0% { box-shadow: 0 0 0 0 rgba(220, 53, 69, 0.7); }
  70% { box-shadow: 0 0 0 10px rgba(220, 53, 69, 0); }
  100% { box-shadow: 0 0 0 0 rgba(220, 53, 69, 0); }
}

.geo-loading {
  color: var(--text-color);
  font-style: italic;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
  display: inline-block;
}

.ttl-info {
  color: var(--primary-dark);
  font-weight: 500;
}

.record-type {
  font-weight: 500;
  padding: 2px 6px;
  border-radius: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
  display: inline-block;
}

.type-a { color: var(--type-a); background-color: rgba(25, 118, 210, 0.1); }
.type-aaaa { color: var(--type-aaaa); background-color: rgba(27, 94, 32, 0.1); }
.type-cname { color: var(--type-cname); background-color: rgba(155, 89, 182, 0.1); }
.type-ns { color: var(--type-ns); background-color: rgba(241, 196, 15, 0.1); }
.type-soa { color: var(--type-soa); background-color: rgba(230, 126, 34, 0.1); }
.type-other { color: var(--type-other); background-color: rgba(149, 165, 166, 0.1); }

.copy-link {
  color: var(--primary-color);
  text-decoration: none;
  border-bottom: 1px dashed var(--primary-color);
  padding-bottom: 2px;
  cursor: pointer;
  position: relative;
}

.copy-link:hover { border-bottom-style: solid; }

.copy-link:after {
  content: '';
  position: absolute;
  top: 0;
  right: -65px;
  opacity: 0;
  white-space: nowrap;
  color: var(--primary-color);
  font-size: 12px;
  transition: opacity 0.2s ease;
}

.copy-link.copied:after { content: '已复制'; opacity: 1; }

@media (max-width: 768px) {
  .ip-record-cell:first-child { width: 35%; }
  .ip-record-cell:last-child { width: 65%; }
}

@media (max-width: 480px) {
  .ip-record-cell {
    padding: 6px 8px;
    font-size: 0.85em;
  }
  .ip-record-cell:first-child { width: 40%; }
  .ip-record-cell:last-child { width: 60%; }
  .geo-country, .geo-as, .geo-blocked {
    font-size: 0.8em;
    padding: 1px 4px;
  }
  .ttl-info { font-size: 0.8em; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .geo-blocked { animation: none; }
}