:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --secondary: #0d9488;
  --secondary-dark: #0f766e;
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.1);
  --shadow-lg: 0 12px 28px rgba(15, 23, 42, 0.12);
  --radius: 0.75rem;
  --radius-sm: 0.5rem;
  --radius-lg: 1rem;
  --success: #16a34a;
  --danger: #dc2626;
  --warning: #d97706;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: 1rem;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header */
.main-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text);
}

.logo-icon {
  width: 2rem;
  height: 2rem;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.875rem;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.mobile-nav-toggle {
  display: none;
  padding: 0.5rem;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
}

.mobile-nav-toggle:hover {
  background: var(--bg);
}

.mobile-nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0.5rem 1.25rem;
  box-shadow: var(--shadow-md);
}

.mobile-nav.show {
  display: block;
}

.mobile-nav .nav-link {
  display: block;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
}

.mobile-nav .nav-link:last-child {
  border-bottom: none;
}

.nav-link {
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.9375rem;
  transition: all 0.2s;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
  background: var(--primary-light);
}

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

.cart-btn {
  position: relative;
  padding: 0.5rem;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: background 0.2s;
}

.cart-btn:hover {
  background: var(--bg);
}

.cart-count {
  position: absolute;
  top: 0;
  right: 0;
  min-width: 1.125rem;
  height: 1.125rem;
  padding: 0 0.25rem;
  background: var(--danger);
  color: #fff;
  font-size: 0.6875rem;
  border-radius: 9999px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.user-name {
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

/* Footer */
.main-footer {
  background: #0f172a;
  color: #cbd5e1;
  padding: 3rem 0 1.5rem;
  margin-top: 4rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-brand {
  color: #fff;
  font-weight: 700;
  font-size: 1.125rem;
  margin-bottom: 0.75rem;
}

.footer-desc {
  font-size: 0.875rem;
  line-height: 1.7;
  color: #94a3b8;
}

.footer-title {
  color: #fff;
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: #94a3b8;
  font-size: 0.875rem;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 1.25rem;
  text-align: center;
  font-size: 0.8125rem;
  color: #64748b;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: all 0.2s;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--secondary);
  color: #fff;
}

.btn-secondary:hover {
  background: var(--secondary-dark);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
}

.btn-outline:hover {
  background: var(--primary-light);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  background: var(--bg);
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 0.875rem 1.75rem;
  font-size: 1rem;
}

.btn-block {
  width: 100%;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, #eff6ff 0%, #f0fdfa 100%);
  padding: 4rem 0;
  text-align: center;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--text);
}

.hero-title span {
  color: var(--primary);
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 2rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Section */
.section {
  padding: 3rem 0;
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-top: 0.25rem;
}

/* Module cards on home */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.module-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}

.module-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.module-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.module-icon {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: var(--radius);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.module-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.module-card p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-bottom: 1.25rem;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-image {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background: #f1f5f9;
}

.card-body {
  padding: 1rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.375rem;
  line-height: 1.4;
}

.card-text {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-meta {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.card-price {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--danger);
}

.card-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.5rem;
  background: var(--bg);
  color: var(--text-muted);
  border-radius: 9999px;
  font-size: 0.75rem;
}

/* Filters */
.filter-bar {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 1.5rem;
}

.filter-btn {
  padding: 0.375rem 0.875rem;
  border-radius: 9999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: all 0.2s;
}

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

.search-input {
  padding: 0.625rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  min-width: 240px;
  outline: none;
  transition: border-color 0.2s;
}

.search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

/* Product detail */
.detail-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  border: 1px solid var(--border);
}

.detail-image {
  width: 100%;
  border-radius: var(--radius);
  object-fit: cover;
  background: #f1f5f9;
}

.detail-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.detail-price {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--danger);
  margin-bottom: 1rem;
}

.detail-meta {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-bottom: 1.25rem;
}

.detail-meta span {
  display: flex;
  gap: 0.5rem;
}

.detail-meta strong {
  color: var(--text);
  min-width: 5rem;
}

.detail-desc {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

/* Cart */
.cart-table {
  width: 100%;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
}

.cart-table th,
.cart-table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.cart-table th {
  background: var(--bg);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.cart-item-img {
  width: 4rem;
  height: 4rem;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background: #f1f5f9;
}

.cart-item-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.cart-total {
  text-align: right;
  padding: 1.25rem;
  font-size: 1.125rem;
}

.cart-total strong {
  font-size: 1.5rem;
  color: var(--danger);
}

.empty-state {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--text-secondary);
}

.empty-state svg {
  width: 4rem;
  height: 4rem;
  margin: 0 auto 1rem;
  color: var(--text-muted);
}

/* Info cards */
.info-card .card-body {
  padding: 1.25rem;
}

.info-publisher {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.info-avatar {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 9999px;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 600;
}

.info-publisher-info {
  flex: 1;
}

.info-publisher-name {
  font-size: 0.9375rem;
  font-weight: 500;
}

.info-publisher-sub {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.info-date {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Info detail */
.info-detail-layout {
  max-width: 800px;
  margin: 0 auto;
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  overflow: hidden;
}

.info-detail-image {
  width: 100%;
  max-height: 420px;
  object-fit: cover;
}

.info-detail-body {
  padding: 2rem;
}

.info-detail-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.info-detail-content {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.info-detail-box {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.info-detail-box h4 {
  font-size: 1rem;
  margin-bottom: 0.75rem;
}

.info-detail-row {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0;
  border-bottom: 1px dashed var(--border);
  font-size: 0.9375rem;
}

.info-detail-row:last-child {
  border-bottom: none;
}

.phone-mask {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  letter-spacing: 0.05em;
}

.card-publisher {
  margin-top: 0.5rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* Forms */
.form-card {
  max-width: 480px;
  margin: 0 auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.form-card-wide {
  max-width: 680px;
}

.form-title {
  font-size: 1.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 0.25rem;
}

.form-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-bottom: 1.5rem;
}

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

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.375rem;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: all 0.2s;
  background: var(--surface);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-checkbox {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  cursor: pointer;
}

.form-checkbox input {
  margin-top: 0.25rem;
  width: 1rem;
  height: 1rem;
  accent-color: var(--primary);
}

.form-checkbox a {
  color: var(--primary);
}

.form-error {
  color: var(--danger);
  font-size: 0.8125rem;
  margin-top: 0.375rem;
}

.form-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.form-tab {
  flex: 1;
  padding: 0.75rem;
  text-align: center;
  font-weight: 500;
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}

.form-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

/* Toast */
.toast {
  position: fixed;
  top: 5rem;
  right: 1.25rem;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  box-shadow: var(--shadow-lg);
  z-index: 200;
  transform: translateX(120%);
  transition: transform 0.3s ease;
  max-width: 320px;
}

.toast.show {
  transform: translateX(0);
}

.toast.success {
  border-left-color: var(--success);
}

.toast.error {
  border-left-color: var(--danger);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 300;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.modal-overlay.show {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 2rem;
  max-width: 420px;
  width: 90%;
  text-align: center;
  transform: scale(0.95);
  transition: transform 0.2s;
}

.modal-overlay.show .modal {
  transform: scale(1);
}

.modal-icon {
  width: 3.5rem;
  height: 3.5rem;
  margin: 0 auto 1rem;
  background: #dcfce7;
  color: var(--success);
  border-radius: 9999px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Company intro */
.company-intro {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.company-intro p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1rem;
}

.company-info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.company-info-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.company-info-item dt {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.company-info-item dd {
  font-size: 0.9375rem;
  font-weight: 500;
}

/* Responsive */
@media (max-width: 768px) {
  .header-inner {
    height: 3.5rem;
  }

  .main-nav {
    display: none;
  }

  .mobile-nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .main-header {
    position: relative;
  }

  .hero {
    padding: 2.5rem 0;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .section {
    padding: 2rem 0;
  }

  .section-title {
    font-size: 1.25rem;
  }

  .detail-layout {
    grid-template-columns: 1fr;
  }

  .card-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }

  .cart-table thead {
    display: none;
  }

  .cart-table,
  .cart-table tbody,
  .cart-table tr,
  .cart-table td {
    display: block;
    width: 100%;
  }

  .cart-table tr {
    margin-bottom: 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
  }

  .cart-table td {
    border-bottom: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .form-card {
    padding: 1.5rem;
  }
}

/* About page */
.about-intro {
  max-width: 800px;
  margin: 0 auto;
}

.about-intro p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1rem;
}

.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.service-tag {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 9999px;
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.contact-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
}

.contact-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
}

.contact-icon {
  width: 3rem;
  height: 3rem;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 9999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.contact-card h4 {
  font-size: 1rem;
  margin-bottom: 0.375rem;
}

.contact-card p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  word-break: break-all;
}

/* Utilities */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.hidden { display: none; }