/* ============ 基础变量 ============ */
:root {
  --bg: #0f1419;
  --bg-soft: #161b22;
  --bg-card: #1c2128;
  --bg-input: #0d1117;
  --border: #30363d;
  --border-soft: #21262d;
  --text: #e6edf3;
  --text-dim: #9da7b3;
  --text-mute: #6e7681;
  --primary: #2f81f7;
  --primary-hover: #4493f8;
  --primary-dim: rgba(47, 129, 247, 0.15);
  --success: #3fb950;
  --warning: #d29922;
  --danger: #f85149;
  --mono: 'SFMono-Regular', 'Cascadia Code', 'Consolas', 'Liberation Mono', Menlo, monospace;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --radius: 10px;
  --radius-sm: 6px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-hover); }

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ============ 页头 ============ */
.site-header {
  background: var(--bg-soft);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 14px 20px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  font-weight: 700;
  font-size: 18px;
}
.logo-mark {
  font-size: 22px;
  color: var(--primary);
  display: inline-block;
  transition: transform 0.4s ease;
}
.logo:hover .logo-mark { transform: rotate(90deg); }

.tabs {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
.tab {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-dim);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  font-family: inherit;
  transition: all 0.15s ease;
}
.tab:hover {
  color: var(--text);
  background: var(--bg-card);
}
.tab.active {
  color: var(--primary);
  background: var(--primary-dim);
  border-color: rgba(47, 129, 247, 0.4);
}

/* ============ 主内容 ============ */
.main-content {
  padding: 32px 20px 64px;
}
.panel { display: none; }
.panel.active { display: block; animation: fadeIn 0.25s ease; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.panel-head {
  margin-bottom: 24px;
}
.panel-head h2 {
  margin: 0 0 6px;
  font-size: 24px;
  font-weight: 700;
}
.panel-desc {
  margin: 0;
  color: var(--text-dim);
  font-size: 14px;
}

/* ============ 卡片 ============ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 22px;
  margin-bottom: 20px;
}
.card h3 {
  margin: 0 0 16px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
@media (max-width: 760px) {
  .grid-2 { grid-template-columns: 1fr; }
}

/* ============ 表单元素 ============ */
.form-row {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
input[type="text"],
input[type="datetime-local"],
select {
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: var(--mono);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  flex: 1;
  min-width: 0;
}
input:focus, select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-dim);
}
input[type="datetime-local"] {
  color-scheme: dark;
}

.btn {
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  font-family: inherit;
  transition: all 0.15s ease;
  white-space: nowrap;
}
.btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.btn.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
.btn.primary:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
  color: #fff;
}

/* ============ 结果展示 ============ */
.result-box {
  background: var(--bg-input);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  padding: 14px;
  min-height: 80px;
  margin-top: 8px;
}
.result-placeholder {
  color: var(--text-mute);
  font-size: 13px;
  text-align: center;
  padding: 18px 0;
}
.result-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--border-soft);
}
.result-row:last-child { border-bottom: none; }
.result-label {
  color: var(--text-dim);
  font-size: 13px;
  min-width: 90px;
}
.result-value {
  color: var(--text);
  font-family: var(--mono);
  font-size: 14px;
  word-break: break-all;
  text-align: right;
  flex: 1;
}
.result-value.highlight { color: var(--success); }
.copy-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 3px 10px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
  font-family: inherit;
  transition: all 0.15s ease;
}
.copy-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.copy-btn.ok {
  border-color: var(--success);
  color: var(--success);
}

/* ============ 实时时间戳 ============ */
.live-timestamp {
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(47,129,247,0.06) 100%);
}
.live-label {
  color: var(--text-dim);
  font-size: 13px;
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}
.live-values {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
}
.live-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.live-num {
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 0.5px;
}
.live-num.small { font-size: 14px; color: var(--text); }
.live-iso .live-num { color: var(--text); }
.live-unit {
  color: var(--text-mute);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.live-meta {
  display: flex;
  align-items: center;
  gap: 8px;
}
.live-copy {
  padding: 2px 8px;
  font-size: 11px;
}

/* ============ 进制转换 ============ */
.base-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
@media (max-width: 600px) {
  .base-grid { grid-template-columns: 1fr; }
}
.base-item label {
  display: block;
  margin-bottom: 8px;
  color: var(--text-dim);
  font-size: 13px;
  font-weight: 500;
}
.input-with-prefix {
  display: flex;
  align-items: stretch;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-input);
  transition: border-color 0.15s ease;
}
.input-with-prefix:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-dim);
}
.input-with-prefix .prefix {
  display: flex;
  align-items: center;
  padding: 0 10px;
  background: var(--bg-soft);
  color: var(--text-mute);
  font-family: var(--mono);
  font-size: 13px;
  border-right: 1px solid var(--border);
  min-width: 32px;
  justify-content: center;
}
.input-with-prefix input {
  border: none;
  background: transparent;
  box-shadow: none !important;
  border-radius: 0;
  width: 100%;
}
.input-with-prefix input:focus { box-shadow: none; }

.base-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 18px;
  flex-wrap: wrap;
}
.base-error {
  color: var(--danger);
  font-size: 13px;
  margin-left: auto;
}

/* ============ JSON 格式化 ============ */
.json-toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.indent-label {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-dim);
  font-size: 13px;
}
.indent-label select {
  min-width: 0;
  flex: none;
  width: auto;
  padding: 6px 10px;
  font-size: 13px;
}
.json-editors {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 760px) {
  .json-editors { grid-template-columns: 1fr; }
}
.json-editor-wrap {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.json-editor-title {
  color: var(--text-dim);
  font-size: 13px;
  font-weight: 500;
}
#json-input,
#json-output {
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  font-family: var(--mono);
  line-height: 1.55;
  outline: none;
  resize: vertical;
  min-height: 280px;
  width: 100%;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  white-space: pre;
  overflow: auto;
}
#json-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-dim);
}
#json-output {
  color-scheme: dark;
}
.json-status {
  margin-top: 14px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-family: var(--sans);
  line-height: 1.5;
  min-height: 1em;
}
.json-status.ok {
  background: rgba(63, 185, 80, 0.1);
  color: var(--success);
  border: 1px solid rgba(63, 185, 80, 0.25);
}
.json-status.error {
  background: rgba(248, 81, 73, 0.1);
  color: var(--danger);
  border: 1px solid rgba(248, 81, 73, 0.25);
}

/* ============ IP 查询 ============ */
.ip-card { text-align: center; }
.ip-card .btn.primary { margin-bottom: 20px; }
.ip-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.ip-address {
  font-family: var(--mono);
  font-size: 36px;
  font-weight: 700;
  color: var(--success);
  letter-spacing: 1px;
  word-break: break-all;
}
.ip-address.local {
  color: var(--text);
  font-size: 28px;
}
.ip-meta {
  display: grid;
  grid-template-columns: auto auto;
  gap: 8px 24px;
  margin-top: 16px;
  text-align: left;
  font-size: 13px;
}
.ip-meta dt { color: var(--text-dim); }
.ip-meta dd { margin: 0; color: var(--text); font-family: var(--mono); }
.ip-loading {
  color: var(--text-dim);
  font-size: 14px;
}
.ip-loading::after {
  content: '';
  display: inline-block;
  width: 14px;
  text-align: left;
  animation: dots 1.2s steps(4, end) infinite;
}
@keyframes dots {
  0%   { content: ''; }
  25%  { content: '.'; }
  50%  { content: '..'; }
  75%  { content: '...'; }
  100% { content: ''; }
}
.ip-note {
  margin-top: 18px;
  color: var(--text-mute);
  font-size: 12px;
  line-height: 1.5;
}

/* ============ 页脚 ============ */
.site-footer {
  border-top: 1px solid var(--border-soft);
  padding: 20px 0;
  text-align: center;
  color: var(--text-mute);
  font-size: 13px;
}
.site-footer p { margin: 4px 0; }
.footer-beian a {
  color: var(--text-mute);
  transition: color 0.15s ease;
}
.footer-beian a:hover {
  color: var(--text-dim);
}