.app {
  height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-header {
  background: linear-gradient(180deg, #3498db 0%, #2d89c7 100%);
  color: white;
  padding: 0.35rem 2rem 0.45rem;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  grid-template-rows: auto auto;
  grid-template-areas:
    ". title ."
    "tabs . actions";
  align-items: center;
  row-gap: 0.6rem;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
  user-select: none;
}

.app-tabs {
  grid-area: tabs;
}

/* Segmented control */
.segmented {
  --seg-bg: rgba(255, 255, 255, 0.16);
  --seg-thumb: #ffffff;
  --seg-color: rgba(255, 255, 255, 0.85);
  --seg-active: #2d89c7;
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  width: 280px;
  background: var(--seg-bg);
  border-radius: 999px;
  padding: 4px;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.15);
  backdrop-filter: saturate(140%) blur(2px);
}

.segmented-thumb {
  position: absolute;
  top: 4px;
  left: 4px;
  width: calc(50% - 4px);
  height: calc(100% - 8px);
  background: var(--seg-thumb);
  border-radius: 999px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
  transition:
    transform 220ms ease,
    width 220ms ease;
  will-change: transform;
}

.segmented-item {
  position: relative;
  z-index: 1;
  background: transparent;
  border: none;
  border-radius: 999px;
  padding: 6px 16px; /* 更紧凑的高度 */
  color: var(--seg-color);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.2px;
  cursor: pointer;
  transition: color 200ms ease;
}

.segmented-item.active {
  color: var(--seg-active);
}

.segmented-item:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.8);
  outline-offset: 2px;
}

.app-header h1 {
  font-size: 1.5rem;
  font-weight: 500;
  margin: 0;
  grid-area: title;
  text-align: center;
}

.header-actions {
  display: flex;
  gap: 1rem;
  grid-area: actions;
  justify-self: end;
}

.refresh-btn,
.add-btn {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.2s;
}

.refresh-btn {
  background: #3498db;
  color: white;
}

.refresh-btn:hover:not(:disabled) {
  background: #2980b9;
}

.refresh-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.import-btn {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.import-btn:hover {
  background: rgba(255, 255, 255, 0.3);
}

.import-btn:focus {
  outline: none;
}

.add-btn {
  background: #27ae60;
  color: white;
  border: none;
}

.add-btn:hover {
  background: #229954;
}

.add-btn:focus {
  outline: none;
}

.app-main {
  flex: 1;
  padding: 2rem;
  overflow-y: auto;
}

.config-path {
  margin-top: 2rem;
  padding: 1rem;
  background: #ecf0f1;
  border-radius: 4px;
  font-size: 0.9rem;
  color: #7f8c8d;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.browse-btn {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 4px;
  background: #3498db;
  color: white;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.2s;
  margin-left: 1rem;
}

.browse-btn:hover {
  background: #2980b9;
}

/* 供应商列表区域 - 相对定位容器 */
.provider-section {
  position: relative;
}

/* 浮动通知 - 绝对定位，不占据空间 */
.notification-floating {
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;

  padding: 0.75rem 1.25rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;

  width: fit-content;
  white-space: nowrap;
}

.fade-in {
  animation: fadeIn 0.3s ease-out;
}

.fade-out {
  animation: fadeOut 0.3s ease-out;
}

.notification-success {
  background: linear-gradient(135deg, #27ae60 0%, #2ecc71 100%);
  color: white;
  box-shadow: 0 4px 12px rgba(39, 174, 96, 0.3);
}

.notification-error {
  background: linear-gradient(135deg, #e74c3c 0%, #ec7063 100%);
  color: white;
  box-shadow: 0 4px 12px rgba(231, 76, 60, 0.3);
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeOut {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}