/* ==================== Global ==================== */
* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --primary: #4F46E5;
  --primary-dark: #4338CA;
  --primary-light: #EEF2FF;
  --success: #10B981;
  --danger: #EF4444;
  --warning: #F59E0B;
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-400: #9CA3AF;
  --gray-500: #6B7280;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-800: #1F2937;
  --gray-900: #111827;
}
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--gray-800);
  background: var(--gray-50);
  line-height: 1.6;
}
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
a { text-decoration: none; color: var(--primary); }
ul { list-style: none; }

/* ==================== Header ==================== */
.header {
  background: white;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}
.logo { font-size: 20px; font-weight: 700; color: var(--primary); }
.header nav { display: flex; align-items: center; gap: 24px; }
.header nav a {
  color: var(--gray-600);
  font-size: 15px;
  transition: color 0.2s;
}
.header nav a:hover { color: var(--primary); }
.dashboard-header nav { gap: 16px; }
.user-name { color: var(--gray-600); font-size: 14px; }
.balance-badge {
  background: var(--primary-light);
  color: var(--primary);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
}

/* ==================== Buttons ==================== */
.btn-primary {
  display: inline-block;
  background: var(--primary);
  color: white !important;
  padding: 10px 24px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }
.btn-outline {
  display: inline-block;
  background: white;
  color: var(--primary) !important;
  padding: 10px 24px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 500;
  border: 1px solid var(--primary);
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
}
.btn-outline:hover { background: var(--primary-light); }
.btn-lg { padding: 14px 36px; font-size: 17px; border-radius: 10px; }
.btn-block { display: block; width: 100%; }
.btn-sm {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 13px;
  background: var(--primary-light);
  color: var(--primary);
  border: none;
  cursor: pointer;
  margin-right: 6px;
  text-align: center;
}
.btn-sm:hover { background: var(--primary); color: white; }

/* ==================== Hero ==================== */
.hero {
  background: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%);
  color: white;
  padding: 80px 0;
  text-align: center;
}
.hero h1 { font-size: 42px; font-weight: 800; margin-bottom: 16px; }
.hero .subtitle { font-size: 18px; opacity: 0.9; margin-bottom: 32px; }
.hero-btns { display: flex; gap: 16px; justify-content: center; margin-bottom: 20px; }
.hero-tip { font-size: 14px; opacity: 0.8; }

/* ==================== Sections ==================== */
.section-title {
  font-size: 32px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 12px;
  color: var(--gray-900);
}
.section-desc {
  text-align: center;
  color: var(--gray-500);
  margin-bottom: 48px;
  font-size: 16px;
}
.page-header {
  background: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%);
  color: white;
  padding: 60px 0;
  text-align: center;
}
.page-header h1 { font-size: 36px; font-weight: 800; margin-bottom: 8px; }

/* ==================== Features ==================== */
.features { padding: 80px 0; background: white; }
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
}
.feature-card {
  padding: 32px;
  border-radius: 12px;
  background: var(--gray-50);
  transition: transform 0.2s, box-shadow 0.2s;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: 0 12px 24px rgba(0,0,0,0.08); }
.feature-icon { font-size: 40px; margin-bottom: 16px; }
.feature-card h3 { font-size: 18px; margin-bottom: 8px; color: var(--gray-900); }
.feature-card p { color: var(--gray-500); font-size: 14px; }

/* Feature detail */
.features-detail { padding: 60px 0; background: white; }
.feature-detail-list { max-width: 800px; margin: 0 auto; }
.feature-detail-item {
  display: flex;
  gap: 24px;
  padding: 32px 0;
  border-bottom: 1px solid var(--gray-100);
}
.feature-detail-item:last-child { border-bottom: none; }
.fd-icon { font-size: 36px; flex-shrink: 0; }
.fd-content h3 { font-size: 20px; margin-bottom: 8px; color: var(--gray-900); }
.fd-content p { color: var(--gray-500); font-size: 15px; line-height: 1.8; }

/* ==================== How it works ==================== */
.how-it-works { padding: 80px 0; background: var(--gray-50); }
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
}
.step { text-align: center; }
.step-num {
  width: 56px; height: 56px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; font-weight: 700;
  margin: 0 auto 16px;
}
.step h3 { font-size: 18px; margin-bottom: 8px; }
.step p { color: var(--gray-500); font-size: 14px; }

/* ==================== Pricing ==================== */
.pricing { padding: 80px 0; background: white; }
.price-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  max-width: 1000px;
  margin: 0 auto;
}
.price-card {
  padding: 32px 24px;
  border-radius: 12px;
  border: 2px solid var(--gray-100);
  text-align: center;
  transition: all 0.2s;
}
.price-card:hover { border-color: var(--primary); transform: translateY(-4px); }
.price-card h3 { font-size: 18px; margin-bottom: 16px; color: var(--gray-900); }
.price { margin-bottom: 8px; }
.price .currency { font-size: 20px; vertical-align: top; color: var(--gray-600); }
.price .amount { font-size: 42px; font-weight: 800; color: var(--primary); }
.scans { font-size: 16px; color: var(--gray-600); margin-bottom: 8px; }
.unit { color: var(--gray-400); font-size: 13px; margin-bottom: 8px; }
.save { height: 20px; font-size: 13px; color: var(--warning); margin-bottom: 16px; }
.divider { height: 1px; background: var(--gray-100); margin: 16px 0; }

.pricing-note {
  max-width: 800px;
  margin: 60px auto 0;
  padding: 24px;
  background: var(--gray-50);
  border-radius: 12px;
}
.pricing-note h3 { margin-bottom: 12px; color: var(--gray-900); }
.pricing-note ul { padding-left: 20px; }
.pricing-note li { color: var(--gray-600); margin-bottom: 8px; list-style: disc; }

/* ==================== CTA ==================== */
.cta {
  background: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%);
  color: white;
  padding: 60px 0;
  text-align: center;
}
.cta h2 { font-size: 32px; margin-bottom: 12px; }
.cta p { font-size: 16px; opacity: 0.9; margin-bottom: 24px; }

/* ==================== Footer ==================== */
.footer {
  background: var(--gray-900);
  color: var(--gray-400);
  padding: 24px 0;
  text-align: center;
  font-size: 14px;
}

/* ==================== Auth Pages ==================== */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #EEF2FF 0%, #EDE9FE 100%);
  padding: 20px;
}
.auth-card {
  background: white;
  padding: 40px;
  border-radius: 16px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.08);
  width: 100%;
  max-width: 420px;
}
.auth-logo { text-align: center; font-size: 24px; font-weight: 700; color: var(--primary); margin-bottom: 24px; }
.auth-card h2 { text-align: center; margin-bottom: 24px; font-size: 24px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 6px; font-size: 14px; color: var(--gray-700); font-weight: 500; }
.form-group input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  font-size: 15px;
  transition: border-color 0.2s;
}
.form-group input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-light); }
.auth-footer { text-align: center; margin-top: 20px; font-size: 14px; color: var(--gray-500); }
.auth-footer a { color: var(--primary); font-weight: 500; }
.auth-tip { text-align: center; margin-top: 16px; font-size: 13px; color: var(--gray-400); }

/* ==================== Alert ==================== */
.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 20px; font-size: 14px; }
.alert-error { background: #FEF2F2; color: var(--danger); border: 1px solid #FECACA; }
.alert-success { background: #ECFDF5; color: var(--success); border: 1px solid #A7F3D0; }

/* ==================== Dashboard ==================== */
.dashboard-main { padding: 40px 0; min-height: 70vh; }
.dashboard-main h1 { font-size: 28px; margin-bottom: 32px; }
.dashboard-main h2 { font-size: 20px; margin: 32px 0 16px; }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}
.stat-card {
  background: white;
  padding: 24px;
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
  text-align: center;
}
.stat-card.large { padding: 32px; }
.stat-icon { font-size: 32px; margin-bottom: 8px; }
.stat-value { font-size: 28px; font-weight: 800; color: var(--primary); }
.stat-card.large .stat-value { font-size: 36px; }
.stat-label { font-size: 14px; color: var(--gray-500); margin-top: 4px; }
.stat-desc { font-size: 12px; color: var(--gray-400); margin-top: 8px; }

.dashboard-actions { display: flex; gap: 12px; margin-bottom: 32px; }

/* Upload */
.upload-card {
  background: white;
  padding: 32px;
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
  max-width: 600px;
  margin-bottom: 32px;
}
.file-drop {
  border: 2px dashed var(--gray-300);
  border-radius: 12px;
  padding: 40px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s;
}
.file-drop:hover { border-color: var(--primary); }
.file-drop p { font-size: 15px; color: var(--gray-600); }
.file-drop .small { font-size: 13px; color: var(--gray-400); margin-top: 8px; }
.file-drop input { display: none; }
.upload-tips {
  background: var(--primary-light);
  padding: 24px;
  border-radius: 12px;
  max-width: 600px;
}
.upload-tips h3 { margin-bottom: 12px; color: var(--primary-dark); }
.upload-tips ol { padding-left: 20px; }
.upload-tips li { color: var(--gray-700); margin-bottom: 8px; font-size: 14px; }

/* QR Grid */
.qr-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}
.qr-card {
  background: white;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}
.qr-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 12px;
  background: var(--gray-50);
}
.qr-pair-item {
  position: relative;
  background: white;
  border-radius: 8px;
  padding: 8px;
  text-align: center;
}
.qr-pair-item img {
  width: 100%;
  height: 140px;
  object-fit: contain;
  background: white;
}
.qr-tag {
  display: inline-block;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: 4px;
  font-weight: 600;
}
.qr-tag-outer { background: #E8F8F0; color: #07C160; }
.qr-tag-inner { background: var(--primary-light); color: var(--primary); }
.qr-info { padding: 16px; }
.qr-info h3 { font-size: 16px; margin-bottom: 8px; }
.qr-info p { font-size: 13px; color: var(--gray-500); margin-bottom: 4px; }
.qr-actions { margin: 12px 0; display: flex; flex-wrap: wrap; gap: 6px; }
.qr-actions .btn-sm { margin-right: 0; }
.btn-danger { background: #FEF2F2 !important; color: var(--danger) !important; }
.btn-danger:hover { background: var(--danger) !important; color: white !important; }
.qr-link { margin-top: 8px; }
.qr-link small { color: var(--gray-400); font-size: 12px; }
.qr-link input {
  width: 100%;
  padding: 6px 10px;
  border: 1px solid var(--gray-200);
  border-radius: 6px;
  font-size: 12px;
  margin-top: 4px;
}

.empty-state { text-align: center; padding: 60px 20px; color: var(--gray-400); }
.empty-state p { margin-bottom: 16px; font-size: 16px; }

/* QR Detail */
.qr-detail-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 32px;
  margin-bottom: 32px;
}
.qr-detail-left { display: flex; flex-direction: column; gap: 20px; }
.qr-preview {
  background: white;
  padding: 20px;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}
.qr-preview h3 { font-size: 14px; color: var(--gray-600); margin-bottom: 12px; }
.qr-preview img { width: 200px; height: 200px; object-fit: contain; }
.qr-detail-right { display: flex; flex-direction: column; gap: 16px; }
.qr-link-box label { font-size: 13px; color: var(--gray-500); }
.qr-link-box input {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--gray-200);
  border-radius: 6px;
  font-size: 12px;
  margin: 4px 0 8px;
}
.back-link { display: inline-block; margin-bottom: 16px; color: var(--primary); font-size: 14px; }

/* Data Table */
.data-table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}
.data-table thead { background: var(--gray-50); }
.data-table th {
  padding: 12px 16px;
  text-align: left;
  font-size: 13px;
  color: var(--gray-500);
  font-weight: 600;
}
.data-table td { padding: 12px 16px; font-size: 14px; border-top: 1px solid var(--gray-100); }
.data-table tbody tr:hover { background: var(--gray-50); }

/* Tags */
.tag { display: inline-block; padding: 2px 8px; border-radius: 4px; font-size: 12px; }
.tag-red { background: #FEF2F2; color: var(--danger); }
.tag-green { background: #ECFDF5; color: var(--success); }
.tag-blue { background: #EFF6FF; color: #3B82F6; }
.text-red { color: var(--danger); font-weight: 500; }
.text-green { color: var(--success); font-weight: 500; }

/* Balance */
.balance-current { margin-bottom: 32px; }
.balance-note {
  text-align: center;
  padding: 16px;
  background: var(--warning);
  background: #FFFBEB;
  border: 1px solid #FDE68A;
  border-radius: 8px;
  margin: 24px 0;
  font-size: 14px;
  color: #92400E;
}

/* ==================== Responsive ==================== */
@media (max-width: 768px) {
  .hero h1 { font-size: 28px; }
  .hero .subtitle { font-size: 15px; }
  .hero-btns { flex-direction: column; align-items: center; }
  .section-title { font-size: 24px; }
  .qr-detail-layout { grid-template-columns: 1fr; }
  .header .container { height: auto; padding: 12px 20px; flex-wrap: wrap; }
  .header nav { gap: 12px; font-size: 13px; }
}