:root[data-theme="light"] {
  --bg: #ffffff;
  --panel: #f7f7f7;
  --card: #ffffff;
  --border: #eaeaea;
  --text: #171717;
  --text-muted: #666666;
  --success: #10a37f;
  --danger: #e5484d;
}
:root[data-theme="dark"] {
  --bg: #000000;
  --panel: #0a0a0a;
  --card: #111111;
  --border: #222222;
  --text: #ededed;
  --text-muted: #888888;
  --success: #10a37f;
  --danger: #e5484d;
}
body {
  background-color: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
  margin: 0;
  display: flex;
  height: 100vh;
  overflow: hidden;
  transition: background-color 0.2s, color 0.2s;
}
.hero-section {
  height: 100vh;
  width: 100vw;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  text-align: center;
}
.hero-content {
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.badge {
  color: var(--text-muted);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.7rem;
  margin-bottom: 24px;
  border: 1px solid var(--border);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-weight: 500;
}
.hero-title {
  font-size: 4rem;
  font-weight: 600;
  line-height: 1.05;
  margin-bottom: 24px;
  letter-spacing: -0.04em;
}
.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 600px;
  margin-bottom: 40px;
  line-height: 1.6;
}
.btn-primary {
  background: var(--text);
  color: var(--bg);
  border: none;
  padding: 12px 24px;
  font-size: 0.95rem;
  border-radius: 6px;
  cursor: pointer;
  transition: transform 0.2s;
  font-weight: 500;
}
.btn-primary:hover {
  transform: scale(1.02);
}
.developer-footer {
  position: absolute;
  bottom: 24px;
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}
.developer-footer strong {
  color: var(--text);
  font-weight: 500;
}
.app-shell {
  display: grid;
  grid-template-columns: 260px 1fr;
  width: 100vw;
  height: 100vh;
}
#sidebar-root {
  height: 100vh;
  display: flex;
  flex-direction: column;
}
.sidebar {
  background: var(--panel);
  border-right: 1px solid var(--border);
  padding: 32px 24px;
  box-sizing: border-box;
  height: 100%;
  width: 100%;
  overflow-y: auto;
}
.workspace {
  background: var(--bg);
  padding: 48px 64px;
  overflow-y: auto;
  height: 100vh;
  box-sizing: border-box;
}
.icon-btn, .lang-switch button {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 6px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s, border-color 0.2s;
}
.icon-btn:hover, .lang-switch button:hover {
  color: var(--text);
  border-color: var(--text-muted);
}
.input-field, .code-area {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  border-radius: 6px;
  font-family: inherit;
  font-size: 0.9rem;
  box-sizing: border-box;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.input-field:focus, .code-area:focus {
  outline: none;
  border-color: var(--text-muted);
  box-shadow: 0 0 0 1px var(--text-muted);
}
.input-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  display: block;
  font-weight: 500;
}
.tool-list a {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-muted);
  text-decoration: none;
  padding: 10px 12px;
  font-size: 0.85rem;
  border-radius: 6px;
  transition: background 0.2s, color 0.2s;
}
.tool-list a:hover {
  background: var(--border);
  color: var(--text);
}
.workspace {
  background: var(--bg);
  padding: 48px 64px;
  overflow-y: auto;
}
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
  margin-top: 32px;
}
.tool-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  cursor: pointer;
  background: var(--card);
  transition: all 0.2s ease;
}
.tool-card:hover {
  border-color: var(--text-muted);
}
.tool-icon {
  width: 40px;
  height: 40px;
  color: var(--text);
  display: flex;
  align-items: center;
  margin-bottom: 16px;
}
.tool-card h3 {
  font-size: 0.95rem;
  font-weight: 500;
  margin: 0;
  letter-spacing: -0.01em;
}
.back-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  margin-bottom: 32px;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0;
  transition: color 0.2s;
}
.back-btn:hover {
  color: var(--text);
}
.result-card {
  background: var(--card);
  padding: 32px;
  border-radius: 12px;
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.result-label {
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin: 0 0 8px 0;
}
.result-value {
  font-size: 2.5rem;
  font-weight: 500;
  letter-spacing: -0.04em;
  margin: 0;
}
.success-text { color: var(--success); }
.danger-text { color: var(--danger); }
.status-badge {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 20px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-muted);
}
.success-badge { color: var(--success); border-color: rgba(16, 163, 127, 0.3); background: rgba(16, 163, 127, 0.05); }
.danger-badge { color: var(--danger); border-color: rgba(229, 72, 77, 0.3); background: rgba(229, 72, 77, 0.05); }
.error-box {
  background: rgba(229, 72, 77, 0.1);
  color: var(--danger);
  padding: 12px 16px;
  border-radius: 6px;
  font-size: 0.85rem;
  margin-top: 16px;
  display: none;
  font-family: monospace;
}
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}
* {
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}