:root {
  --bg-dark: #0f172a;
  --bg-panel: #1e293b;
  --bg-card: #263349;
  --bg-input: #0b1120;
  --border: #334155;
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --accent: #38bdf8;
  --accent-hover: #0284c7;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --purple: #a855f7;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
}

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

body {
  background: var(--bg-dark);
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-badge {
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  color: #fff;
  font-weight: 800;
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
}

.brand h1 {
  font-size: 1.15rem;
  font-weight: 700;
}

.brand span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.nav-tabs {
  display: flex;
  gap: 0.5rem;
}

.tab-btn {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid transparent;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  transition: all 0.15s;
}

.tab-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
}

.tab-btn.active {
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent);
  border-color: rgba(56, 189, 248, 0.4);
}

.status-pills {
  display: flex;
  gap: 0.6rem;
  align-items: center;
  font-size: 0.8rem;
}

.pill {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
}

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

main {
  flex: 1;
  padding: 1.25rem 1.5rem;
  max-width: 1600px;
  width: 100%;
  margin: 0 auto;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 1.25rem;
}

@media (max-width: 1024px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--border);
}

.card-header h2 {
  font-size: 1.05rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.form-section {
  margin-bottom: 1rem;
}

.form-section label.section-label {
  display: block;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  font-weight: 700;
}

.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(175px, 1fr));
  gap: 0.5rem;
}

.check-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 0.45rem 0.65rem;
  border-radius: 6px;
  font-size: 0.85rem;
  cursor: pointer;
  user-select: none;
}

.check-item:hover {
  border-color: var(--accent);
}

.check-item input {
  accent-color: var(--accent);
}

.input-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.75rem;
}

.input-group label {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

input[type="text"], select, textarea {
  width: 100%;
  background: var(--bg-input);
  color: var(--text-main);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.5rem 0.65rem;
  font-size: 0.88rem;
}

input[type="text"]:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.code-box {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: #38bdf8;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
  position: relative;
  margin-top: 0.4rem;
}

.btn-row {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-top: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border);
  padding: 0.48rem 0.9rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s;
}

.btn:hover {
  border-color: var(--accent);
  background: rgba(56, 189, 248, 0.1);
}

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

.btn-primary:hover {
  background: #0369a1;
}

.btn-success {
  background: #15803d;
  border-color: var(--success);
  color: #fff;
}

.dropzone {
  border: 2px dashed var(--border);
  border-radius: 10px;
  padding: 2rem 1.25rem;
  text-align: center;
  background: rgba(15, 23, 42, 0.5);
  cursor: pointer;
  transition: all 0.2s;
}

.dropzone:hover, .dropzone.dragover {
  border-color: var(--accent);
  background: rgba(56, 189, 248, 0.08);
}

.dropzone h3 {
  font-size: 1rem;
  margin-bottom: 0.35rem;
}

.dropzone p {
  font-size: 0.83rem;
  color: var(--text-muted);
}

.progress-wrap {
  margin-top: 1rem;
  display: none;
}

.progress-bar-bg {
  width: 100%;
  height: 10px;
  background: var(--bg-input);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #0284c7, #22c55e);
  transition: width 0.15s;
}

.workbench-layout {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 1.25rem;
  height: calc(100vh - 140px);
  min-height: 600px;
}

.file-sidebar {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sidebar-controls {
  padding: 0.85rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.file-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem;
}

.file-item {
  padding: 0.55rem 0.65rem;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  border: 1px solid transparent;
  margin-bottom: 0.25rem;
}

.file-item:hover {
  background: var(--bg-card);
}

.file-item.active {
  background: rgba(56, 189, 248, 0.14);
  border-color: rgba(56, 189, 248, 0.45);
}

.file-item-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.4rem;
}

.file-name {
  font-weight: 600;
  font-size: 0.86rem;
  word-break: break-all;
}

.file-meta {
  display: flex;
  gap: 0.35rem;
  align-items: center;
  flex-wrap: wrap;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.badge {
  font-size: 0.68rem;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-weight: 700;
  text-transform: uppercase;
}

.badge-base { background: #334155; color: #cbd5e1; }
.badge-region { background: #475569; color: #e2e8f0; }
.badge-configured { background: #1e3a8a; color: #93c5fd; }
.badge-site { background: #065f46; color: #6ee7b7; }
.badge-user { background: #581c87; color: #d8b4fe; }
.badge-modified { background: #78350f; color: #fcd34d; }
.badge-added { background: #14532d; color: #86efac; }
.badge-active { border: 1px solid var(--accent); color: var(--accent); }

.editor-pane {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.editor-header {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.editor-textarea {
  flex: 1;
  width: 100%;
  background: var(--bg-input);
  color: #e2e8f0;
  border: none;
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.55;
  resize: none;
}

.diff-view {
  flex: 1;
  background: var(--bg-input);
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  overflow: auto;
  white-space: pre;
  display: none;
}

.toast {
  position: fixed;
  bottom: 1.25rem;
  right: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--accent);
  color: var(--text-main);
  padding: 0.75rem 1.1rem;
  border-radius: 8px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.4);
  display: none;
  z-index: 999;
  font-size: 0.88rem;
}