:root {
  --color-recyclable: #104883;
  --color-hazardous: #e53122;
  --color-wet: #694539;
  --color-dry: #312d2a;
  --color-tab-inactive: #eceff3;
  --color-tab-inactive-text: #9aa3b2;
  --color-gray-bg: #f0f4f8;
  --color-gray-text: #8a94a6;
  --color-border: #e8ecf1;
  --color-surface: #ffffff;
  --color-body: #eef2f7;
  --color-row-even: #ffffff;
  --color-row-odd: #f5f8fb;
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 18px;
  --radius-xl: 22px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.14);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--color-body);
  color: #2d3748;
  line-height: 1.6;
  -webkit-tap-highlight-color: transparent;
}

/* Layout utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-1 { flex: 1; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.w-full { width: 100%; }
.h-full { height: 100%; }
.min-h-screen { min-height: 100vh; }
.max-w-md { max-width: 28rem; }
.mx-auto { margin-left: auto; margin-right: auto; }
.px-3 { padding-left: 0.75rem; padding-right: 0.75rem; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.py-3 { padding-top: 0.75rem; padding-bottom: 0.75rem; }
.py-4 { padding-top: 1rem; padding-bottom: 1rem; }
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-sm { font-size: 0.875rem; }
.text-base { font-size: 1rem; }
.text-lg { font-size: 1.125rem; }
.font-bold { font-weight: 700; }
.font-medium { font-weight: 500; }
.rounded-lg { border-radius: var(--radius-md); }
.shadow { box-shadow: var(--shadow-sm); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.overflow-hidden { overflow: hidden; }
.overflow-y-auto { overflow-y: auto; }
.relative { position: relative; }
.fixed { position: fixed; }
.inset-0 { top: 0; right: 0; bottom: 0; left: 0; }
.z-50 { z-index: 50; }
.hidden { display: none !important; }
.shrink-0 { flex-shrink: 0; }
.cursor-pointer { cursor: pointer; }
.select-none { user-select: none; }

/* Category colors */
.text-recyclable { color: var(--color-recyclable); }
.text-hazardous { color: var(--color-hazardous); }
.text-wet { color: var(--color-wet); }
.text-dry { color: var(--color-dry); }
.text-gray { color: var(--color-gray-text); }
.bg-gray-light { background-color: var(--color-gray-bg); }

/* App shell */
.app-container {
  max-width: 28rem;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: #eef2f7;
  box-shadow: none;
}

/* Header */
.header {
  padding: 1.125rem 1.25rem 1rem;
  background: #eef2f7;
  border-bottom: none;
  box-shadow: 0 1px 0 rgba(15, 23, 42, 0.05);
}
.header-top {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  margin-bottom: 0.875rem;
  position: relative;
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.625rem;
}
.logo-icon {
  /*width: 2.75rem; */
  height: 2.75rem;
  flex-shrink: 0;
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}
.title-text {
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.45;
  color: #1a202c;
  letter-spacing: -0.01em;
}

/* Buttons */
.btn {
  border: none;
  cursor: pointer;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease;
  font-family: inherit;
}
.btn:active { transform: scale(0.97); opacity: 0.9; }
.btn-header {
  padding: 0.5rem 0.875rem;
  background: var(--color-gray-bg);
  color: #4a5568;
  font-weight: 500;
  box-shadow: var(--shadow-sm);
}
.btn-query {
  padding: 0.75rem 1.125rem;
  background: linear-gradient(135deg, #1e5088 0%, #104883 100%);
  color: #fff;
  font-weight: 600;
  white-space: nowrap;
  box-shadow: 0 3px 10px rgba(23, 59, 107, 0.28);
  border-radius: var(--radius-sm);
}
.btn-voice {
  padding: 0.75rem 0.875rem;
  background: var(--color-gray-bg);
  color: #4a5568;
  font-size: 0.75rem;
  white-space: nowrap;
  min-width: 4.75rem;
  font-weight: 500;
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius-sm);
}
.btn-voice.recording {
  background: linear-gradient(135deg, #ff6b6b 0%, #ee4444 100%);
  color: #fff;
  animation: pulse 1.2s ease-in-out infinite;
  box-shadow: 0 3px 12px rgba(238, 68, 68, 0.35);
}
.btn-standard {
  padding: 0.375rem 0.875rem;
  background: rgba(255, 255, 255, 0.92);
  color: #2d3748;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 9999px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  backdrop-filter: blur(4px);
}
.btn-confirm {
  width: 100%;
  padding: 1rem 1.25rem;
  background: linear-gradient(135deg, #1e5088 0%, #104883 100%);
  color: #fff;
  font-size: 1.0625rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  margin-top: 1.75rem;
  box-shadow: 0 4px 14px rgba(23, 59, 107, 0.3);
  letter-spacing: 0.02em;
}
.btn-close {
  background: var(--color-gray-bg);
  border: none;
  font-size: 1.25rem;
  color: #718096;
  cursor: pointer;
  line-height: 1;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease;
}
.btn-close:hover { background: #e2e8f0; }
.btn-close-transparent {
  background: transparent;
  border: none;
  font-size: 1.75rem;
  color: rgba(0, 0, 0, 0.22);
  cursor: pointer;
  line-height: 1;
  padding: 0.625rem;
  margin-top: 0.75rem;
  border-radius: 50%;
  transition: color 0.15s ease, background 0.15s ease;
}
.btn-close-transparent:hover {
  color: rgba(0, 0, 0, 0.45);
  background: var(--color-gray-bg);
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.85; transform: scale(0.98); }
}

/* Search row */
.search-row {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.875rem 1.25rem 1rem;
  background: #eef2f7;
}
.search-input {
  flex: 1;
  padding: 0.8125rem 1rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  outline: none;
  background: var(--color-gray-bg);
  color: #2d3748;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}
.search-input:focus {
  border-color: var(--color-recyclable);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(23, 59, 107, 0.12);
}
.search-input::placeholder {
  color: #a0aec0;
}

/* Language dropdown */
.lang-dropdown { position: relative; }
.lang-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  min-width: 7rem;
  z-index: 60;
  overflow: hidden;
  padding: 0.375rem;
}
.lang-menu-item {
  padding: 0.625rem 0.875rem;
  cursor: pointer;
  font-size: 0.875rem;
  border-radius: 8px;
  color: #4a5568;
  transition: background 0.15s ease;
}
.lang-menu-item:hover,
.lang-menu-item.active {
  background: var(--color-gray-bg);
  color: #1a202c;
  font-weight: 500;
}

/* Browse section */
.browse-section {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 0 1rem 1rem;
  gap: 0;
}

/* Tabs */
.tabs-wrap {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.tabs {
  display: flex;
  gap: 0;
  background: var(--color-tab-inactive);
  padding: 0;
}
.tab {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  padding: 0;
  cursor: pointer;
  transition: background-color 0.2s ease;
  border-radius: 0;
  border-bottom: none;
  background: var(--color-tab-inactive);
  overflow: hidden;
  min-width: 0;
}
.tab-color-bar {
  display: block;
  width: 100%;
  height: 4px;
  flex-shrink: 0;
}
.tab.active {
  position: relative;
  z-index: 1;
  margin-bottom: -1px;
}
.tab-icon {
  display: block;
  width: 100%;
  max-width: 210px;
  height: auto;
  aspect-ratio: 1 / 1;
  margin: 0 auto;
  object-fit: contain;
  object-position: center;
}
.tab.active .tab-icon {
  filter: none;
}

/* Tab detail */
.tab-detail {
  padding: 1rem 1.125rem 1.125rem;
  color: #fff;
  display: flex;
  flex-direction: column;
  min-height: 4.5rem;
  border-radius: 0;
  box-shadow: none;
  margin-top: -1px;
}
.tab-desc {
  font-size: 0.875rem;
  line-height: 1.65;
  opacity: 0.95;
}
.tab-standard-wrap {
  align-self: flex-end;
  margin-top: calc(1 * 1.65em);
}

/* Search result hints */
.search-hints {
  padding: 1rem 1.25rem;
  background: var(--color-gray-bg);
  border-radius: var(--radius-md);
  margin: 0 1rem 0.75rem;
}
.search-hint-main {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 0.375rem;
  color: #2d3748;
  line-height: 1.5;
}
.search-hint-sub {
  font-size: 0.8125rem;
  color: var(--color-gray-text);
  line-height: 1.5;
}

/* Item list */
.item-list {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}
.item-list-browse {
  margin-top: 0.875rem;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}
.item-list-search-wrap {
  margin: 0 1rem 1rem;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}
.list-item {
  padding: 1rem 1.125rem;
  text-align: center;
  cursor: pointer;
  font-size: 1rem;
  color: #2d3748;
  transition: background 0.15s ease;
  letter-spacing: 0.01em;
}
.list-item-even {
  background: var(--color-row-even);
}
.list-item-odd {
  background: var(--color-row-odd);
}
.list-item:active {
  background: #e8f0fe !important;
}
.list-item-search {
  display: flex;
  justify-content: space-between;
  align-items: center;
  text-align: left;
  padding: 1rem 1.25rem;
}
.list-item-search .item-name {
  flex: 1;
  font-weight: 500;
}
.list-item-search .item-category {
  font-size: 0.875rem;
  font-weight: 600;
  flex-shrink: 0;
  margin-left: 0.75rem;
}

/* Modals */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  padding: 1.25rem;
  animation: fadeIn 0.2s ease;
}
.modal-card {
  background: #fff;
  border-radius: var(--radius-xl);
  padding: 1.75rem 1.625rem;
  width: 100%;
  max-width: 22rem;
  max-height: 85vh;
  overflow-y: auto;
  position: relative;
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.25s ease;
}
.modal-card-wide {
  max-width: 24rem;
}
.modal-card-item {
  color: #fff;
}
.modal-card-item .modal-title {
  color: #fff;
}
.modal-card-item .modal-line {
  color: #fff;
  opacity: 0.95;
}
.modal-card-item .modal-divider {
  border-top-color: rgba(255, 255, 255, 0.35);
}
.modal-card-item .modal-tips-title {
  color: #fff;
}
.modal-card-item .modal-tips-list {
  color: #fff;
  opacity: 0.9;
}
.modal-card-item .modal-standard-body {
  color: #fff;
  opacity: 0.95;
}
.modal-card-item .btn-close-transparent {
  color: rgba(255, 255, 255, 0.55);
}
.modal-card-item .btn-close-transparent:hover {
  color: rgba(255, 255, 255, 0.9);
  background: rgba(255, 255, 255, 0.12);
}
.modal-header {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 0.25rem;
}
.modal-title {
  font-size: 1.3125rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 1rem;
  color: #1a202c;
  line-height: 1.35;
}
.modal-suggest {
  text-align: center;
  color: #fff;
}
.modal-suggest-label {
  font-size: 0.875rem;
  color: #fff;
  opacity: 0.95;
  line-height: 1.65;
}
.modal-suggest-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}
.modal-suggest-icon {
  display: block;
  width: auto;
  max-width: 210px;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  object-position: center;
}
.modal-line {
  font-size: 0.875rem;
  color: #4a5568;
  margin-bottom: 0.5rem;
  line-height: 1.65;
  padding: 0 0.5rem;
}
.modal-divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 1.25rem 0 1rem;
}
.modal-tips-title {
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: 0.625rem;
  color: #2d3748;
}
.modal-tips-list {
  font-size: 0.8125rem;
  color: #718096;
  line-height: 1.85;
  padding-left: 0;
  list-style: none;
}
.modal-tips-list li {
  margin-bottom: 0.375rem;
  padding-left: 0.25rem;
}
.modal-standard-body {
  font-size: 0.875rem;
  line-height: 1.75;
  color: #4a5568;
  white-space: pre-line;
  padding: 0 0.25rem;
}
.welcome-title {
  font-size: 1.375rem;
  font-weight: 700;
  text-align: center;
  color: #1a202c;
  line-height: 1.35;
  margin-bottom: 1.25rem;
}
.welcome-text p {
  font-size: 0.9375rem;
  line-height: 1.75;
  margin-bottom: 0.875rem;
  text-align: left;
  color: #4a5568;
}
.welcome-text p:last-child {
  margin-bottom: 0;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Main content area */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--color-body);
}

#browse-view {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#search-view {
  padding-top: 0.75rem;
}

.no-results {
  padding: 2.5rem 1.5rem;
  text-align: center;
  color: var(--color-gray-text);
  font-size: 0.9375rem;
  line-height: 1.6;
}

.app-footer {
  padding: 1rem 1.25rem 1.25rem;
  text-align: center;
  background: #eef2f7;
  border-top: 1px solid var(--color-border);
  flex-shrink: 0;
}
.app-footer p {
  font-size: 0.75rem;
  color: var(--color-gray-text);
  line-height: 1.5;
  letter-spacing: 0.01em;
}

@media (min-width: 768px) {
  body {
    padding: 1.5rem 0;
  }
  .app-container {
    min-height: calc(100vh - 3rem);
    border-radius: var(--radius-xl);
    overflow: hidden;
  }
  .title-text { font-size: 1.375rem; }
  .modal-card { max-width: 26rem; padding: 2rem 1.75rem; }
  .list-item { padding: 1.0625rem 1.25rem; }
}