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

:root {
  --blue: #1677ff;
  --blue-light: #e6f4ff;
  --blue-hover: #4096ff;
  --red: #ff4d4f;
  --red-light: #fff1f0;
  --border: #e8e8e8;
  --bg: #f0f2f5;
  --text: #333;
  --text-secondary: #666;
  --text-muted: #999;
  --radius: 6px;
  --shadow: 0 2px 8px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,.14);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
  font-size: 14px;
}

/* ── Layout ── */
.app { display: flex; height: 100vh; }

/* ── Sidebar ── */
.sidebar {
  width: 240px;
  background: #fff;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.sidebar-logo {
  padding: 14px 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  border-bottom: 1px solid #f5f5f5;
  display: flex;
  align-items: center;
  gap: 8px;
  user-select: none;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 6px 0;
}

.sidebar-nav::-webkit-scrollbar { width: 4px; }
.sidebar-nav::-webkit-scrollbar-thumb { background: #e0e0e0; border-radius: 2px; }

.module-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 14px;
  position: relative;
  transition: background .15s;
}
.module-item:hover { background: #fafafa; color: var(--text); }
.module-item.active { background: var(--blue-light); color: var(--blue); font-weight: 500; }
.module-item[draggable="true"] { cursor: grab; }
.module-item.dragging { opacity: 0.4; }
.module-item.drag-over { border-top: 2px solid var(--blue); }

.module-icon {
  width: 16px; height: 16px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.module-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.module-count { font-size: 11px; color: var(--text-muted); flex-shrink: 0; }

.module-actions {
  display: none;
  gap: 2px;
  flex-shrink: 0;
}
.module-item:hover .module-actions { display: flex; }
.module-item:hover .module-count { display: none; }

.sidebar-footer {
  padding: 10px 12px;
  border-top: 1px solid #f5f5f5;
}
.btn-add-module {
  width: 100%;
  padding: 7px 10px;
  border: 1px dashed #d9d9d9;
  background: none;
  color: var(--text-muted);
  font-size: 13px;
  cursor: pointer;
  border-radius: var(--radius);
  transition: all .15s;
}
.btn-add-module:hover { border-color: var(--blue); color: var(--blue); }

/* ── Main ── */
.main { flex: 1; display: flex; flex-direction: column; overflow: hidden; min-width: 0; }

.main-header {
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}
.main-header h1 { font-size: 16px; font-weight: 600; }

.header-actions { display: flex; align-items: center; gap: 10px; }

.search-box {
  display: flex;
  align-items: center;
  gap: 6px;
  border: 1px solid #d9d9d9;
  border-radius: var(--radius);
  padding: 5px 10px;
  background: #fff;
  transition: border-color .15s;
}
.search-box:focus-within { border-color: var(--blue); }
.search-box input { border: none; outline: none; font-size: 13px; width: 180px; color: var(--text); }
.search-box input::placeholder { color: var(--text-muted); }

/* ── Buttons ── */
.btn-primary {
  padding: 6px 16px;
  background: var(--blue);
  color: #fff;
  border: 1px solid var(--blue);
  border-radius: var(--radius);
  font-size: 13px;
  cursor: pointer;
  transition: background .15s;
  white-space: nowrap;
}
.btn-primary:hover { background: var(--blue-hover); border-color: var(--blue-hover); }
.btn-primary:disabled { opacity: .6; cursor: not-allowed; }

.btn-secondary {
  padding: 6px 14px;
  background: #fff;
  color: var(--text);
  border: 1px solid #d9d9d9;
  border-radius: var(--radius);
  font-size: 13px;
  cursor: pointer;
  transition: all .15s;
  white-space: nowrap;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.btn-secondary:hover { border-color: var(--blue); color: var(--blue); }

.btn-danger {
  padding: 6px 14px;
  background: #fff;
  color: var(--red);
  border: 1px solid var(--red);
  border-radius: var(--radius);
  font-size: 13px;
  cursor: pointer;
  transition: all .15s;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.btn-danger:hover { background: var(--red); color: #fff; }

.btn-icon {
  background: none;
  border: none;
  cursor: pointer;
  padding: 3px 5px;
  font-size: 12px;
  color: var(--text-muted);
  border-radius: 3px;
  line-height: 1;
  display: flex;
  align-items: center;
  transition: all .15s;
}
.btn-icon:hover { color: var(--blue); background: var(--blue-light); }
.btn-icon.del:hover { color: var(--red); background: var(--red-light); }

.btn-close {
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: var(--text-muted);
  line-height: 1;
  padding: 0 2px;
  transition: color .15s;
}
.btn-close:hover { color: var(--text); }

/* ── Prototype Grid ── */
.prototype-grid {
  flex: 1;
  overflow-y: auto;
  padding: 20px 24px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
  align-content: start;
}
.prototype-grid::-webkit-scrollbar { width: 6px; }
.prototype-grid::-webkit-scrollbar-thumb { background: #ddd; border-radius: 3px; }

.proto-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  cursor: pointer;
  transition: box-shadow .2s, border-color .2s;
  display: flex;
  flex-direction: column;
}
.proto-card:hover { box-shadow: var(--shadow); border-color: #d0d0d0; }

.proto-card-header { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 8px; }
.proto-card-title { font-size: 14px; font-weight: 500; color: var(--text); line-height: 1.4; flex: 1; }
.proto-card-tag {
  margin-left: 8px; flex-shrink: 0;
  font-size: 11px; padding: 1px 6px;
  background: var(--blue-light); color: var(--blue);
  border-radius: 3px; white-space: nowrap;
}
.proto-card-body { flex: 1; min-height: 0; }
.proto-card-footer {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid #f0f0f0;
  flex-shrink: 0;
}
.proto-card-time { font-size: 12px; color: var(--text-muted); }
.proto-card-preview {
  font-size: 12px; color: var(--blue); text-decoration: none;
  padding: 3px 8px; border: 1px solid var(--blue); border-radius: 3px;
  transition: background .15s;
}
.proto-card-preview:hover { background: var(--blue-light); }

/* ── Empty state ── */
.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: var(--text-muted);
  padding: 60px 0;
}
.empty-state p { font-size: 14px; }
.empty-state .empty-sub { font-size: 12px; }

/* ── Drawer ── */
.drawer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.2);
  z-index: 800;
  display: flex;
  justify-content: flex-end;
}

.drawer {
  background: #fff;
  width: 700px;
  max-width: 96vw;
  height: 100vh;
  display: flex;
  flex-direction: column;
  box-shadow: -4px 0 24px rgba(0,0,0,.12);
  animation: drawerIn .22s ease;
}

@keyframes drawerIn {
  from { transform: translateX(100%); }
  to   { transform: translateX(0); }
}

.drawer-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}
.drawer-header h3 { font-size: 15px; font-weight: 600; }

.drawer-body {
  padding: 20px;
  overflow-y: auto;
  flex: 1;
}
.drawer-body::-webkit-scrollbar { width: 4px; }
.drawer-body::-webkit-scrollbar-thumb { background: #e0e0e0; border-radius: 2px; }

/* ── Modals ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal {
  background: #fff;
  border-radius: 8px;
  width: 420px;
  max-width: 96vw;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  animation: modalIn .18s ease;
}
.modal-lg { width: 560px; }

@keyframes modalIn {
  from { opacity: 0; transform: translateY(-12px) scale(.97); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid #f0f0f0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}
.modal-header h3 { font-size: 15px; font-weight: 600; }

.modal-body { padding: 20px; overflow-y: auto; flex: 1; }
.modal-body::-webkit-scrollbar { width: 4px; }
.modal-body::-webkit-scrollbar-thumb { background: #e0e0e0; border-radius: 2px; }

.modal-footer {
  padding: 12px 20px;
  border-top: 1px solid #f0f0f0;
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  flex-shrink: 0;
}

/* ── Forms ── */
.form-group { margin-bottom: 16px; }
.form-group:last-child { margin-bottom: 0; }

.form-label { display: block; font-size: 13px; font-weight: 500; color: var(--text); margin-bottom: 6px; }
.form-label.required::after { content: ' *'; color: var(--red); }

.form-input, .form-select {
  width: 100%;
  padding: 7px 11px;
  border: 1px solid #d9d9d9;
  border-radius: var(--radius);
  font-size: 13px;
  outline: none;
  color: var(--text);
  background: #fff;
  transition: border-color .15s, box-shadow .15s;
}
.form-input::placeholder { color: var(--text-muted); }
.form-input:focus, .form-select:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 2px rgba(22,119,255,.1);
}

/* ── Upload Area ── */
.upload-area {
  border: 1px dashed #d9d9d9;
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background .15s;
  user-select: none;
}
.upload-area:hover, .upload-area.drag-over { border-color: var(--blue); background: #f0f7ff; }
.upload-icon { margin-bottom: 8px; }
.upload-area > p { font-size: 13px; color: var(--text-secondary); margin-bottom: 3px; }
.upload-hint { font-size: 12px !important; color: var(--text-muted) !important; }
.upload-selected { color: var(--blue) !important; font-weight: 500; margin-top: 6px; font-size: 12px !important; }

/* ── Detail Panel ── */
.detail-info { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; margin-bottom: 16px; }

.detail-row {
  display: flex;
  align-items: flex-start;
  padding: 10px 16px;
  font-size: 13px;
  border-bottom: 1px solid #f5f5f5;
}
.detail-row:last-child { border-bottom: none; }

.detail-label { width: 76px; color: var(--text-muted); flex-shrink: 0; padding-top: 1px; }
.detail-value { flex: 1; color: var(--text); word-break: break-all; display: flex; align-items: center; gap: 6px; }

.preview-link { color: var(--blue); text-decoration: none; word-break: break-all; }
.preview-link:hover { text-decoration: underline; }

.copy-btn {
  padding: 1px 8px;
  font-size: 11px;
  background: none;
  border: 1px solid #d9d9d9;
  border-radius: 3px;
  cursor: pointer;
  color: var(--text-secondary);
  white-space: nowrap;
  flex-shrink: 0;
  transition: all .15s;
}
.copy-btn:hover { border-color: var(--blue); color: var(--blue); }

.module-tag {
  display: inline-block;
  padding: 2px 8px;
  background: var(--blue-light);
  color: var(--blue);
  border-radius: 3px;
  font-size: 12px;
}

.module-select-inline {
  padding: 2px 6px;
  background: var(--blue-light);
  color: var(--blue);
  border: 1px solid transparent;
  border-radius: 3px;
  font-size: 12px;
  cursor: pointer;
  outline: none;
  max-width: 160px;
}
.module-select-inline:hover { border-color: var(--blue); }
.module-select-inline:focus { border-color: var(--blue); box-shadow: 0 0 0 2px rgba(22,119,255,.1); }

.detail-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 20px; }

/* ── Upload Records ── */
.upload-records-title { font-size: 14px; font-weight: 600; margin-bottom: 10px; }

.record-list { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }

.record-item {
  display: grid;
  grid-template-columns: 1fr auto auto auto;
  align-items: center;
  padding: 8px 16px;
  font-size: 12px;
  color: var(--text-secondary);
  border-bottom: 1px solid #f5f5f5;
  gap: 10px;
}
.record-item:last-child { border-bottom: none; }
.record-time { color: var(--text-secondary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.record-note { color: var(--text-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.record-size { color: var(--text-muted); white-space: nowrap; }
.record-dl {
  display: flex; align-items: center; justify-content: center;
  width: 24px; height: 24px;
  color: var(--text-muted);
  border: 1px solid #e0e0e0;
  border-radius: 4px;
  text-decoration: none;
  transition: all .15s;
  flex-shrink: 0;
}
.record-dl:hover { color: var(--blue); border-color: var(--blue); background: var(--blue-light); }

.record-empty { padding: 16px; text-align: center; font-size: 12px; color: var(--text-muted); }

/* ── Toast ── */
.toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(0);
  background: #333;
  color: #fff;
  padding: 9px 18px;
  border-radius: 4px;
  font-size: 13px;
  z-index: 9999;
  pointer-events: none;
  animation: toastIn .2s ease;
  white-space: nowrap;
}
.toast.success { background: #52c41a; }
.toast.error   { background: var(--red); }

@keyframes toastIn {
  from { opacity: 0; transform: translateX(-50%) translateY(-8px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ── Loading overlay ── */
.btn-loading { opacity: .65; pointer-events: none; }