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

:root {
  --bg: #0f1117;
  --bg-card: #1a1d27;
  --bg-input: #14161f;
  --border: #2a2d3a;
  --text: #e1e4ed;
  --text-secondary: #8b8fa3;
  --primary: #6366f1;
  --primary-hover: #5558e6;
  --primary-bg: rgba(99, 102, 241, 0.1);
  --success: #22c55e;
  --error: #ef4444;
  --radius: 8px;
  --radius-sm: 6px;
  --font-mono: 'SF Mono', 'Cascadia Code', 'Fira Code', 'JetBrains Mono', monospace;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  text-align: center;
  padding: 32px 20px 20px;
}

header h1 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #6366f1, #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 6px;
  display: block;
}

nav.tabs {
  display: flex;
  justify-content: center;
  gap: 4px;
  padding: 0 20px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.tab {
  padding: 8px 18px;
  font-size: 14px;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.tab:hover {
  color: var(--text);
  border-color: #555;
}

.tab.active {
  color: #fff;
  background: var(--primary);
  border-color: var(--primary);
}

main {
  flex: 1;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
  padding: 0 20px 40px;
}

.panel {
  display: none;
}

.panel.active {
  display: block;
}

.tool-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.input-group label {
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
}

textarea, input[type="text"], input[type="datetime-local"] {
  width: 100%;
  padding: 12px 14px;
  font-size: 14px;
  font-family: var(--font-mono);
  background: var(--bg-input);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  resize: vertical;
  outline: none;
  transition: border-color 0.2s;
}

textarea:focus, input:focus {
  border-color: var(--primary);
}

textarea {
  min-height: 200px;
  line-height: 1.6;
}

.btn-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  padding: 8px 20px;
  font-size: 13px;
  font-weight: 500;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: inherit;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

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

.btn-secondary {
  background: var(--bg-input);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  color: var(--text);
  border-color: #555;
}

.btn-sm {
  padding: 4px 12px;
  font-size: 12px;
}

.msg {
  font-size: 13px;
  margin-left: 8px;
}

.msg.success { color: var(--success); }
.msg.error { color: var(--error); }

/* 时间戳 */
.ts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.ts-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.ts-card h3 {
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.ts-display {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.ts-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.ts-label {
  font-size: 12px;
  color: var(--text-secondary);
  width: 80px;
  flex-shrink: 0;
}

.ts-value {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--primary);
  flex: 1;
  word-break: break-all;
}

.ts-result {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text);
  padding: 10px 12px;
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  min-height: 40px;
  word-break: break-all;
}

/* 正则 */
.regex-layout {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.regex-config {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.regex-flags {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.cb-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
}

.regex-result-box {
  min-height: 120px;
  max-height: 300px;
  overflow-y: auto;
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-secondary);
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-all;
}

.match-item {
  padding: 4px 0;
  border-bottom: 1px solid var(--border);
}

.match-item:last-child { border-bottom: none; }

.match-highlight {
  background: var(--primary-bg);
  color: var(--primary);
  padding: 1px 3px;
  border-radius: 2px;
}

/* 哈希 */
.hash-results {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
}

.hash-item, .color-item {
  display: flex;
  align-items: center;
  gap: 10px;
}

.hash-label {
  font-size: 12px;
  color: var(--text-secondary);
  width: 60px;
  flex-shrink: 0;
  font-weight: 500;
}

.hash-item input, .color-item input {
  flex: 1;
}

/* 颜色 */
.color-layout {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

.color-picker-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

#color-picker {
  width: 80px;
  height: 80px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  padding: 2px;
  background: transparent;
}

.color-preview {
  width: 80px;
  height: 80px;
  border-radius: var(--radius);
  border: 2px solid var(--border);
}

.color-values {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Footer */
footer {
  text-align: center;
  padding: 20px;
  font-size: 12px;
  color: var(--text-secondary);
  border-top: 1px solid var(--border);
}

/* 响应式 */
@media (max-width: 768px) {
  .tool-row, .ts-grid, .hash-results {
    grid-template-columns: 1fr;
  }
  .color-layout {
    flex-direction: column;
    align-items: center;
  }
  .tab {
    padding: 6px 12px;
    font-size: 13px;
  }
}