@import url("https://fonts.googleapis.com/css2?family=Archivo:wght@400;500;600;700;800;900&family=DM+Sans:wght@400;500;600;700&display=swap");

:root {
  --black: #0a0a0a;
  --white: #ffffff;
  --gray-50: #fafafa;
  --gray-100: #f4f4f5;
  --gray-200: #e4e4e7;
  --gray-300: #d4d4d8;
  --gray-400: #a1a1aa;
  --gray-500: #71717a;
  --gray-600: #52525b;
  --gray-700: #3f3f46;
  --gray-800: #27272a;
  --gray-900: #18181b;
  --font-display: "Archivo", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "DM Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  --max-width: 1200px;
  --header-height: 64px;
  --radius: 2px;
  --transition: 0.2s ease;
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--black);
  background: var(--white);
  line-height: 1.6;
  min-height: 100vh;
  text-rendering: optimizeLegibility;
  -webkit-tap-highlight-color: transparent;
}

img {
  content-visibility: auto;
  image-rendering: auto;
  -webkit-user-drag: none;
}

.product-thumbnail img {
  aspect-ratio: 4 / 3;
}

.product-card {
  content-visibility: auto;
  contain-intrinsic-size: 280px;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--gray-500);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  transition: all var(--transition);
}

input,
textarea,
select {
  font-family: inherit;
  font-size: 14px;
  outline: none;
}

img {
  max-width: 100%;
  display: block;
}

/* Layout */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  height: var(--header-height);
  padding-top: env(safe-area-inset-top);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  padding-left: max(24px, env(safe-area-inset-left));
  padding-right: max(24px, env(safe-area-inset-right));
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.5px;
  color: var(--black);
}

.header-brand img {
  width: 28px;
  height: 28px;
  object-fit: cover;
  border-radius: var(--radius);
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-600);
  border-radius: var(--radius);
  transition: all var(--transition);
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--black);
  background: var(--gray-100);
}

.nav-link.active {
  color: var(--white);
  background: var(--black);
}

.header-user {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
}

.user-id-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.5px;
  color: var(--gray-700);
}

.user-id-badge .label {
  color: var(--gray-400);
  font-weight: 500;
}

.balance-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  background: var(--black);
  color: var(--white);
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 13px;
}

.balance-badge .currency-symbol {
  font-size: 10px;
  opacity: 0.7;
}

.btn-logout {
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 500;
  color: var(--gray-500);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
}

.btn-logout:hover {
  color: var(--black);
  border-color: var(--gray-400);
}

.main-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 24px;
  min-height: calc(100vh - var(--header-height));
}

.page-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 28px;
  letter-spacing: -1px;
  color: var(--black);
  margin-bottom: 8px;
}

.page-subtitle {
  font-size: 14px;
  color: var(--gray-500);
  margin-bottom: 32px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.3px;
  border-radius: var(--radius);
  transition: all var(--transition);
  white-space: nowrap;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--black);
  color: var(--white);
  border-color: var(--black);
}

.btn-primary:hover {
  background: var(--gray-800);
  border-color: var(--gray-800);
}

.btn-primary:disabled {
  background: var(--gray-300);
  border-color: var(--gray-300);
  cursor: not-allowed;
}

.btn-secondary {
  background: var(--white);
  color: var(--black);
  border-color: var(--gray-300);
}

.btn-secondary:hover {
  border-color: var(--black);
}

.btn-danger {
  background: var(--white);
  color: var(--black);
  border-color: var(--black);
}

.btn-danger:hover {
  background: var(--black);
  color: var(--white);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 12px;
}

.btn-block {
  width: 100%;
}

/* Forms */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 6px;
  letter-spacing: 0.3px;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--black);
  background: var(--white);
  transition: border-color var(--transition);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--black);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
  line-height: 1.6;
}

.form-hint {
  font-size: 12px;
  color: var(--gray-400);
  margin-top: 4px;
}

.form-error {
  font-size: 13px;
  color: var(--black);
  font-weight: 500;
  padding: 10px 14px;
  background: var(--gray-100);
  border-left: 3px solid var(--black);
  border-radius: 2px;
  margin-bottom: 16px;
}

/* Auth page */
.auth-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: var(--white);
  padding: 24px;
}

.auth-card {
  width: 100%;
  max-width: 420px;
  border: 1px solid var(--gray-200);
  padding: 40px;
}

.auth-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 32px;
}

.auth-logo img {
  width: 56px;
  height: 56px;
  object-fit: cover;
  margin-bottom: 12px;
}

.auth-logo h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 22px;
  letter-spacing: -0.5px;
}

.auth-logo p {
  font-size: 13px;
  color: var(--gray-500);
  margin-top: 4px;
}

.code-input-group {
  display: flex;
  gap: 8px;
}

.code-input-group .form-input {
  flex: 1;
}

/* Product grid */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.product-card {
  border: 1px solid var(--gray-200);
  background: var(--white);
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  border-color: var(--black);
  transform: translateY(-2px);
}

.product-thumbnail {
  width: 100%;
  aspect-ratio: 4 / 3;
  background: var(--gray-100);
  overflow: hidden;
}

.product-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-info {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.product-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--black);
  line-height: 1.3;
}

.product-desc {
  font-size: 13px;
  color: var(--gray-500);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.product-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.product-price {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  color: var(--black);
}

.product-price .currency-symbol {
  font-size: 12px;
  font-weight: 600;
  opacity: 0.6;
  margin-left: 2px;
}

.product-status-tag {
  display: inline-block;
  padding: 2px 8px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.5px;
  border-radius: var(--radius);
}

.status-on {
  background: var(--black);
  color: var(--white);
}

.status-off {
  background: var(--gray-200);
  color: var(--gray-500);
}

/* Empty state */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 80px 24px;
  color: var(--gray-400);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.empty-state h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--gray-600);
  margin-bottom: 8px;
}

.empty-state p {
  font-size: 14px;
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  animation: fadeIn 0.2s ease;
}

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

.modal {
  background: var(--white);
  max-width: 480px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.modal-header {
  padding: 24px 24px 0;
}

.modal-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.5px;
}

.modal-body {
  padding: 16px 24px 24px;
}

.modal-body p {
  font-size: 14px;
  color: var(--gray-700);
  line-height: 1.7;
  margin-bottom: 12px;
}

.modal-body .highlight {
  color: var(--black);
  font-weight: 600;
}

.modal-body .user-id-display {
  text-align: center;
  padding: 20px;
  margin: 16px 0;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
}

.modal-body .user-id-display .id-label {
  font-size: 12px;
  color: var(--gray-400);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.modal-body .user-id-display .id-value {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 36px;
  letter-spacing: 4px;
  color: var(--black);
}

.modal-footer {
  padding: 0 24px 24px;
  display: flex;
  gap: 12px;
}

.modal-footer .btn {
  flex: 1;
}

.modal-rules {
  font-size: 14px;
  color: var(--gray-700);
  line-height: 1.8;
}

.modal-rules .rule-item {
  padding: 8px 0;
  border-bottom: 1px solid var(--gray-100);
}

.modal-rules .rule-item:last-child {
  border-bottom: none;
}

.modal-rules .rule-num {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--black);
  margin-right: 8px;
}

/* Recharge page */
.recharge-container {
  max-width: 600px;
  margin: 0 auto;
}

.recharge-card {
  border: 1px solid var(--gray-200);
  padding: 40px;
  text-align: center;
}

.qr-code {
  width: 240px;
  height: 240px;
  margin: 0 auto 24px;
  border: 1px solid var(--gray-200);
  padding: 8px;
}

.qr-code img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.recharge-info {
  text-align: left;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--gray-100);
}

.recharge-info-item {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  font-size: 14px;
}

.recharge-info-item .label {
  color: var(--gray-500);
}

.recharge-info-item .value {
  font-weight: 600;
  color: var(--black);
}

/* Admin */
.admin-section {
  margin-bottom: 40px;
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.admin-table th {
  text-align: left;
  padding: 12px 16px;
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-200);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--gray-500);
}

.admin-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--gray-100);
}

.admin-table tr:hover {
  background: var(--gray-50);
}

.admin-actions {
  display: flex;
  gap: 8px;
}

/* Image cropper */
.cropper-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.cropper-preview {
  width: 100%;
  max-width: 400px;
  aspect-ratio: 4 / 3;
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  overflow: hidden;
  position: relative;
}

.cropper-canvas {
  position: absolute;
  cursor: move;
}

.cropper-overlay {
  position: absolute;
  border: 2px solid var(--white);
  box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.5);
  pointer-events: none;
}

.cropper-controls {
  display: flex;
  gap: 8px;
  align-items: center;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--black);
  color: var(--white);
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 500;
  z-index: 2000;
  animation: toastIn 0.3s ease;
}

@keyframes toastIn {
  from { transform: translate(-50%, 20px); opacity: 0; }
  to { transform: translate(-50%, 0); opacity: 1; }
}

.toast.error {
  background: var(--gray-900);
  border: 1px solid var(--black);
}

/* File upload */
.file-upload-area {
  border: 2px dashed var(--gray-300);
  padding: 32px;
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition);
}

.file-upload-area:hover {
  border-color: var(--black);
}

.file-upload-area.dragover {
  border-color: var(--black);
  background: var(--gray-50);
}

.file-upload-area p {
  font-size: 14px;
  color: var(--gray-500);
}

.file-upload-area .file-name {
  font-weight: 600;
  color: var(--black);
  margin-top: 8px;
  word-break: break-all;
}

/* Loading */
.loading {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
}

.spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--gray-200);
  border-top-color: var(--black);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Footer */
.app-footer {
  border-top: 1px solid var(--gray-200);
  padding: 24px;
  text-align: center;
  font-size: 12px;
  color: var(--gray-400);
}

/* Responsive */
@media (max-width: 1024px) {
  :root {
    --max-width: 960px;
  }
  .main-container {
    padding: 24px 20px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  .header-inner {
    padding: 0 14px;
    flex-wrap: wrap;
    height: auto;
    min-height: var(--header-height);
    padding-top: 8px;
    padding-bottom: 8px;
    gap: 8px;
  }

  .header-brand {
    font-size: 15px;
    gap: 8px;
  }

  .header-brand img {
    width: 24px;
    height: 24px;
  }

  .header-nav {
    order: 3;
    width: 100%;
    overflow-x: auto;
    padding-bottom: 6px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .header-nav::-webkit-scrollbar {
    display: none;
  }

  .nav-link {
    padding: 6px 12px;
    font-size: 13px;
    flex-shrink: 0;
  }

  .header-user {
    gap: 6px;
    margin-left: auto;
  }

  .user-id-badge,
  .balance-badge {
    font-size: 11px;
    padding: 3px 8px;
  }

  .btn-logout {
    padding: 4px 10px;
    font-size: 12px;
  }

  .main-container {
    padding: 20px 14px;
  }

  .page-title {
    font-size: 22px;
    margin-bottom: 4px;
  }

  .page-subtitle {
    font-size: 13px;
    margin-bottom: 20px;
  }

  .product-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 12px;
  }

  .product-card:hover {
    transform: none;
  }

  .product-info {
    padding: 12px;
    gap: 6px;
  }

  .product-title {
    font-size: 14px;
  }

  .product-desc {
    font-size: 12px;
    -webkit-line-clamp: 2;
  }

  .product-footer {
    padding: 10px 12px;
    flex-wrap: wrap;
  }

  .product-price {
    font-size: 15px;
  }

  .product-price .currency-symbol {
    font-size: 10px;
  }

  .btn-sm {
    padding: 5px 10px;
    font-size: 11px;
  }

  .auth-card {
    padding: 28px 20px;
  }

  .recharge-card {
    padding: 24px 16px;
  }

  .qr-code {
    width: 200px;
    height: 200px;
  }

  .modal-overlay {
    padding: 16px;
  }

  .modal {
    max-width: 100%;
    max-height: 94vh;
  }

  .modal-header {
    padding: 20px 20px 0;
  }

  .modal-body {
    padding: 14px 20px 20px;
  }

  .modal-footer {
    padding: 0 20px 20px;
    gap: 8px;
  }

  .modal-title {
    font-size: 18px;
  }

  .modal-body .user-id-display .id-value {
    font-size: 28px;
    letter-spacing: 3px;
  }

  .admin-table {
    font-size: 12px;
  }

  .admin-table th,
  .admin-table td {
    padding: 8px 6px;
  }

  .admin-actions {
    gap: 4px;
  }

  .form-group {
    margin-bottom: 16px;
  }

  .form-input,
  .form-textarea {
    padding: 10px 12px;
    font-size: 16px;
  }
}

@media (max-width: 480px) {
  .header-brand span {
    display: none;
  }

  .product-grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .product-info {
    padding: 10px;
  }

  .product-title {
    font-size: 13px;
  }

  .product-desc {
    font-size: 11px;
    -webkit-line-clamp: 1;
  }

  .product-footer {
    padding: 8px 10px;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
  }

  .product-price {
    font-size: 14px;
    text-align: center;
  }

  .btn-sm {
    width: 100%;
  }

  .qr-code {
    width: 180px;
    height: 180px;
  }

  .modal-footer {
    flex-direction: column-reverse;
  }

  .modal-footer .btn {
    width: 100%;
  }

  .auth-card {
    padding: 24px 16px;
  }
}

@media (max-width: 360px) {
  .product-grid {
    grid-template-columns: 1fr;
  }

  .header-user .user-id-badge {
    display: none;
  }
}

@media (max-width: 768px) and (orientation: landscape) {
  .auth-page {
    align-items: flex-start;
    padding-top: 40px;
  }
}

@media (min-width: 1600px) {
  :root {
    --max-width: 1400px;
  }
}

@media print {
  .app-header,
  .app-footer,
  .btn,
  .nav-link {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (hover: none) {
  .product-card:hover {
    transform: none;
  }

  .btn:hover {
    transform: none;
  }
}