/* ============================================
   Thu Tiền - Premium Dark Glassmorphism Design
   ============================================ */

/* Google Font Import */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ============================================
   CSS Custom Properties (Design Tokens)
   ============================================ */
:root {
  --bg-primary: #0a0a1a;
  --bg-secondary: #111128;
  --bg-card: rgba(255, 255, 255, 0.05);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: rgba(0, 0, 0, 0.3);
  --text-primary: #e8e8f0;
  --text-secondary: #8888aa;
  --text-muted: #555577;
  --accent-gradient: linear-gradient(135deg, #667eea, #764ba2);
  --accent-primary: #667eea;
  --accent-secondary: #764ba2;
  --success: #00d4aa;
  --success-glow: rgba(0, 212, 170, 0.3);
  --warning: #ffb347;
  --danger: #ff6b6b;
  --pending-pulse: rgba(255, 179, 71, 0.4);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* ============================================
   Reset & Global Styles
   ============================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* Animated Gradient Mesh Background */
body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  right: -50%;
  bottom: -50%;
  width: 200%;
  height: 200%;
  background: 
    radial-gradient(ellipse at 20% 50%, rgba(102, 126, 234, 0.12) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(118, 75, 162, 0.1) 0%, transparent 50%),
    radial-gradient(ellipse at 40% 80%, rgba(0, 212, 170, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 60%, rgba(255, 179, 71, 0.05) 0%, transparent 50%);
  z-index: -1;
  animation: gradientShift 20s ease-in-out infinite alternate;
  filter: blur(40px);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* ============================================
   Layout
   ============================================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-secondary);
}

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

/* ============================================
   Header
   ============================================ */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 26, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  padding: 16px 0;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  font-size: 28px;
  filter: drop-shadow(0 0 8px rgba(102, 126, 234, 0.4));
}

.logo h1 {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-card);
  border-color: var(--glass-border);
}

/* ============================================
   Collection Info
   ============================================ */
.collection-info {
  padding: 40px 0 16px;
  text-align: center;
}

.collection-info h2 {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 8px;
}

.collection-info p {
  font-size: 16px;
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   Stats Section
   ============================================ */
.stats-section {
  padding: 24px 0;
}

.stats-bar {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
}

.stat-card {
  flex: 1;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
  transition: all var(--transition-normal);
}

.stat-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px var(--glass-shadow);
}

.stat-icon {
  font-size: 28px;
  margin-bottom: 8px;
  filter: drop-shadow(0 0 6px rgba(102, 126, 234, 0.3));
}

.stat-value {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Progress Bar */
.progress-container {
  position: relative;
  height: 8px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 16px;
}

.progress-bar {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: 4px;
  transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  min-width: 0;
}

.progress-bar::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  animation: shimmer 2s infinite;
}

.progress-text {
  position: absolute;
  right: 0;
  top: -22px;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent-primary);
}

/* Amount Summary */
.amount-summary {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  font-size: 14px;
  color: var(--text-secondary);
}

.amount-summary strong {
  color: var(--text-primary);
}

/* ============================================
   Payments Section
   ============================================ */
.payments-section {
  padding: 24px 0 60px;
}

.payments-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

/* ============================================
   Payment Card
   ============================================ */
.payment-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--transition-normal);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  animation: fadeIn 0.4s ease both;
}

.payment-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.payment-card:hover {
  transform: translateY(-4px);
  background: var(--bg-card-hover);
  box-shadow: 
    0 12px 40px rgba(0, 0, 0, 0.3),
    0 0 30px rgba(102, 126, 234, 0.08);
  border-color: rgba(255, 255, 255, 0.15);
}

.payment-card:hover::before {
  opacity: 1;
}

/* Paid card */
.payment-card.paid {
  border-left: 3px solid var(--success);
  background: rgba(0, 212, 170, 0.03);
}

.payment-card.paid:hover {
  box-shadow: 
    0 12px 40px rgba(0, 0, 0, 0.3),
    0 0 20px var(--success-glow);
}

.payment-card.paid::before {
  background: linear-gradient(135deg, var(--success), #00b894);
  opacity: 1;
}

/* Confirming animation */
.payment-card.confirming {
  animation: confirmFlash 1.5s ease;
  border-color: var(--success);
}

/* Payment card internal elements */
.payment-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.payment-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
}

.payment-amount {
  font-size: 22px;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
  font-variant-numeric: tabular-nums;
}

.payment-card.paid .payment-amount {
  background: linear-gradient(135deg, var(--success), #00b894);
  -webkit-background-clip: text;
  background-clip: text;
}

/* QR Code Container */
.payment-qr {
  background: #ffffff;
  border-radius: var(--radius-md);
  padding: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  transition: transform var(--transition-normal);
}

.payment-qr:hover {
  transform: scale(1.02);
}

.payment-qr img {
  width: 100%;
  height: auto;
  border-radius: 8px;
}

/* Payment Footer */
.payment-footer {
  margin-top: auto;
}

.transfer-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  font-weight: 600;
  display: block;
  margin-bottom: 6px;
}

.transfer-code-box {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
}

.transfer-code-box code {
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 13px;
  color: var(--accent-primary);
  flex: 1;
  letter-spacing: 0.5px;
  word-break: break-all;
}

.paid-time {
  font-size: 12px;
  color: var(--success);
  margin-top: 8px;
  opacity: 0.8;
}

/* ============================================
   Status Badges
   ============================================ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}

.badge-pending {
  background: rgba(255, 179, 71, 0.12);
  color: var(--warning);
  border: 1px solid rgba(255, 179, 71, 0.2);
}

.badge-paid {
  background: rgba(0, 212, 170, 0.12);
  color: var(--success);
  border: 1px solid rgba(0, 212, 170, 0.2);
  animation: glowPulse 2s ease-in-out infinite;
}

.pulse-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--warning);
  display: inline-block;
  animation: pulse-dot 1.5s ease-in-out infinite;
}

/* ============================================
   Toast Notifications
   ============================================ */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 400px;
}

.toast {
  background: rgba(17, 17, 40, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transform: translateX(120%);
  transition: transform var(--transition-normal);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  font-size: 14px;
}

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

.toast-exit {
  transform: translateX(120%) !important;
  opacity: 0;
}

.toast-success {
  border-left: 3px solid var(--success);
}

.toast-error {
  border-left: 3px solid var(--danger);
}

.toast-info {
  border-left: 3px solid var(--accent-primary);
}

.toast-message {
  flex: 1;
  line-height: 1.4;
}

.toast-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 18px;
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
  transition: color var(--transition-fast);
}

.toast-close:hover {
  color: var(--text-primary);
}

/* ============================================
   Modal
   ============================================ */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
}

.modal {
  background: rgba(17, 17, 40, 0.95);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 32px;
  max-width: 500px;
  width: 100%;
  position: relative;
  transform: scale(0.9);
  transition: transform var(--transition-normal);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
}

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

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  font-size: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  transform: rotate(90deg);
}

.modal-body {
  text-align: center;
}

.modal-body h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.modal-amount {
  font-size: 28px;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 20px;
}

.modal-qr {
  background: #ffffff;
  border-radius: var(--radius-md);
  padding: 16px;
  display: inline-block;
  margin-bottom: 20px;
}

.modal-qr img {
  width: 280px;
  height: auto;
  border-radius: 8px;
}

.modal-transfer-info {
  text-align: center;
}

.modal-transfer-info > p {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.modal-transfer-info .transfer-code-box {
  justify-content: center;
  margin-bottom: 12px;
}

/* ============================================
   Empty State
   ============================================ */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 80px 20px;
  gap: 16px;
}

.empty-icon {
  font-size: 64px;
  filter: drop-shadow(0 0 10px rgba(102, 126, 234, 0.3));
}

.empty-state h3 {
  font-size: 22px;
  font-weight: 600;
  color: var(--text-primary);
}

.empty-state p {
  color: var(--text-secondary);
  max-width: 400px;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  text-align: center;
  padding: 32px 0;
  color: var(--text-muted);
  font-size: 13px;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  line-height: 1.4;
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  border: none;
  box-shadow: 0 4px 16px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
  filter: brightness(1.15);
  box-shadow: 0 6px 24px rgba(102, 126, 234, 0.4);
  transform: translateY(-1px);
  color: #ffffff;
}

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

.btn-secondary:hover {
  background: var(--bg-card);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-danger {
  background: rgba(255, 107, 107, 0.15);
  color: var(--danger);
  border: 1px solid rgba(255, 107, 107, 0.2);
}

.btn-danger:hover {
  background: rgba(255, 107, 107, 0.25);
  border-color: rgba(255, 107, 107, 0.4);
}

.btn-success {
  background: rgba(0, 212, 170, 0.15);
  color: var(--success);
  border: 1px solid rgba(0, 212, 170, 0.2);
}

.btn-success:hover {
  background: rgba(0, 212, 170, 0.25);
  border-color: rgba(0, 212, 170, 0.4);
}

.btn-icon {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  width: 32px;
  height: 32px;
  padding: 0;
  border-radius: var(--radius-sm);
  font-size: 14px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.btn-icon:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--text-primary);
  transform: scale(1.05);
}

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

.btn-warning {
  background: rgba(255, 179, 71, 0.15);
  color: var(--warning);
  border: 1px solid rgba(255, 179, 71, 0.2);
}

.btn-warning:hover {
  background: rgba(255, 179, 71, 0.25);
}

/* ============================================
   Form Elements
   ============================================ */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-input,
input[type="text"],
input[type="password"],
input[type="number"],
input[type="email"],
textarea,
select {
  width: 100%;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  transition: all var(--transition-fast);
  outline: none;
}

.form-input:focus,
input[type="text"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
input[type="email"]:focus,
textarea:focus,
select:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
  background: rgba(255, 255, 255, 0.06);
}

.form-input::placeholder,
input::placeholder,
textarea::placeholder {
  color: var(--text-muted);
}

textarea {
  resize: vertical;
  min-height: 100px;
}

select {
  appearance: none;
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238888aa' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.form-row {
  display: flex;
  gap: 12px;
}

.form-row .form-group {
  flex: 1;
}

.form-actions {
  display: flex;
  gap: 8px;
  margin-top: 20px;
}

.form-error {
  color: var(--danger);
  font-size: 13px;
  margin-top: 8px;
  display: none;
}

.form-error.visible {
  display: block;
}

/* ============================================
   Admin Page Styles
   ============================================ */

/* Login Section */
.login-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.login-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 48px 40px;
  max-width: 420px;
  width: 100%;
  text-align: center;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.4);
  animation: scaleIn 0.4s ease;
}

.login-card .logo {
  justify-content: center;
  margin-bottom: 32px;
}

.login-card .logo h1 {
  font-size: 28px;
}

.login-card h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.login-card .form-group {
  text-align: left;
}

.login-card .btn-primary {
  width: 100%;
  padding: 14px;
  font-size: 16px;
  margin-top: 8px;
}

.login-error {
  color: var(--danger);
  font-size: 14px;
  margin-top: 12px;
  display: none;
}

.login-error.visible {
  display: block;
  animation: fadeIn 0.3s ease;
}

/* Admin Layout */
.admin-section {
  display: none;
}

.admin-section.active {
  display: block;
}

.admin-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 26, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  padding: 16px 0;
}

.admin-header .header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.admin-header .header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.admin-header .header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.admin-content {
  padding: 32px 0 60px;
}

/* Admin Section Cards */
.admin-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 24px;
}

.admin-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.admin-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.admin-card-header h3 {
  margin-bottom: 0;
}

/* Collections List */
.collection-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.collection-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  gap: 12px;
}

.collection-item:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.1);
}

.collection-item.active {
  background: rgba(102, 126, 234, 0.08);
  border-color: rgba(102, 126, 234, 0.2);
  box-shadow: 0 0 16px rgba(102, 126, 234, 0.1);
}

.collection-item.selected {
  background: rgba(102, 126, 234, 0.12);
  border-color: rgba(102, 126, 234, 0.3);
}

.collection-item-info {
  flex: 1;
  min-width: 0;
}

.collection-item-info h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.collection-item-info p {
  font-size: 13px;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.collection-item-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.active-badge {
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 10px;
  background: rgba(0, 212, 170, 0.15);
  color: var(--success);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Data Table */
.table-container {
  overflow-x: auto;
  margin: 0 -4px;
  padding: 0 4px;
}

.data-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 14px;
}

.data-table thead {
  position: sticky;
  top: 0;
  z-index: 1;
}

.data-table th {
  background: rgba(255, 255, 255, 0.04);
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  white-space: nowrap;
  border-bottom: 1px solid var(--glass-border);
}

.data-table th:first-child {
  border-radius: var(--radius-sm) 0 0 0;
}

.data-table th:last-child {
  border-radius: 0 var(--radius-sm) 0 0;
}

.data-table td {
  padding: 14px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  vertical-align: middle;
}

.data-table tbody tr {
  transition: background var(--transition-fast);
}

.data-table tbody tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.015);
}

.data-table tbody tr:hover {
  background: rgba(255, 255, 255, 0.04);
}

.data-table tbody tr.paid-row {
  background: rgba(0, 212, 170, 0.03);
}

.data-table tbody tr.paid-row:hover {
  background: rgba(0, 212, 170, 0.06);
}

.table-actions {
  display: flex;
  gap: 4px;
  align-items: center;
}

.table-amount {
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--accent-primary);
}

.table-transfer-code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 12px;
  color: var(--text-secondary);
}

/* Bulk Add Section */
.bulk-add-section {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.bulk-add-section h4 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

.bulk-add-section .help-text {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 12px;
  font-style: italic;
}

/* Payments Management Header */
.payments-management-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 12px;
}

.payments-management-header h3 {
  margin-bottom: 0;
}

.payments-stats {
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: var(--text-secondary);
}

.payments-stats strong {
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

/* ============================================
   Utility Classes
   ============================================ */
.text-gradient {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-secondary {
  color: var(--text-secondary);
}

.text-muted {
  color: var(--text-muted);
}

.text-success {
  color: var(--success);
}

.text-warning {
  color: var(--warning);
}

.text-danger {
  color: var(--danger);
}

.glass {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  box-shadow: 0 8px 32px var(--glass-shadow);
}

.amount {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.hidden {
  display: none !important;
}

.text-center {
  text-align: center;
}

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }

/* ============================================
   Animations
   ============================================ */
@keyframes pulse-dot {
  0%, 100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.5);
    opacity: 0.6;
  }
}

@keyframes slideInRight {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes slideOutRight {
  from {
    transform: translateX(0);
    opacity: 1;
  }
  to {
    transform: translateX(100%);
    opacity: 0;
  }
}

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

@keyframes scaleIn {
  from {
    transform: scale(0.9);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes shimmer {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(100%);
  }
}

@keyframes progressFill {
  from {
    width: 0%;
  }
  to {
    width: var(--progress, 100%);
  }
}

@keyframes glowPulse {
  0%, 100% {
    box-shadow: 0 0 4px rgba(0, 212, 170, 0.1);
  }
  50% {
    box-shadow: 0 0 12px rgba(0, 212, 170, 0.25);
  }
}

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

@keyframes gradientShift {
  0% {
    transform: translate(-10%, -10%) rotate(0deg);
  }
  50% {
    transform: translate(5%, 5%) rotate(180deg);
  }
  100% {
    transform: translate(-10%, -10%) rotate(360deg);
  }
}

@keyframes confirmFlash {
  0% {
    border-color: var(--glass-border);
    box-shadow: none;
  }
  25% {
    border-color: var(--success);
    box-shadow: 0 0 30px var(--success-glow), inset 0 0 20px rgba(0, 212, 170, 0.05);
  }
  50% {
    border-color: var(--success);
    box-shadow: 0 0 20px var(--success-glow);
  }
  100% {
    border-color: var(--success);
    box-shadow: none;
  }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Loading spinner */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  display: inline-block;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1200px) {
  .payments-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 900px) {
  .payments-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .collection-info h2 {
    font-size: 26px;
  }

  .stat-value {
    font-size: 28px;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }

  .stats-bar {
    flex-wrap: wrap;
  }

  .stat-card {
    flex: 1 1 calc(33% - 12px);
    padding: 16px;
    min-width: 100px;
  }

  .stat-value {
    font-size: 24px;
  }

  .stat-label {
    font-size: 11px;
  }

  .amount-summary {
    gap: 16px;
    font-size: 12px;
  }

  .payments-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .payment-card {
    padding: 18px;
  }

  .payment-amount {
    font-size: 18px;
  }

  .modal {
    padding: 24px;
    margin: 16px;
  }

  .modal-qr img {
    width: 220px;
  }

  .toast-container {
    left: 16px;
    right: 16px;
    max-width: none;
  }

  .data-table {
    font-size: 13px;
  }

  .data-table th,
  .data-table td {
    padding: 10px 12px;
  }

  .form-row {
    flex-direction: column;
  }

  .collection-item {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .collection-item-actions {
    justify-content: flex-end;
  }
}

@media (max-width: 480px) {
  .logo h1 {
    font-size: 20px;
  }

  .collection-info h2 {
    font-size: 22px;
  }

  .collection-info {
    padding: 24px 0 8px;
  }

  .stats-bar {
    flex-direction: column;
    gap: 8px;
  }

  .stat-card {
    flex: 1 1 100%;
    display: flex;
    align-items: center;
    gap: 12px;
    text-align: left;
    padding: 14px 18px;
  }

  .stat-icon {
    font-size: 24px;
    margin-bottom: 0;
  }

  .stat-value {
    font-size: 22px;
  }

  .payments-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .payment-card {
    padding: 16px;
  }

  .payment-name {
    font-size: 14px;
  }

  .payment-amount {
    font-size: 18px;
    margin-bottom: 12px;
  }

  .amount-summary {
    flex-direction: column;
    gap: 6px;
    align-items: center;
  }

  .modal {
    padding: 20px;
  }

  .modal-qr img {
    width: 100%;
    max-width: 260px;
  }

  .modal-amount {
    font-size: 22px;
  }

  .login-card {
    padding: 32px 24px;
  }

  .admin-card {
    padding: 20px;
  }

  .payments-management-header {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
  body::before,
  .header,
  .footer,
  .toast-container,
  .modal-overlay {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  .payment-card {
    break-inside: avoid;
    border: 1px solid #ccc;
    box-shadow: none;
    backdrop-filter: none;
  }
}

/* ============================================
   New UI Components (Tabs, Search, List)
   ============================================ */

/* Tabs */
.collection-tabs {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding: 16px 0;
  margin-bottom: 10px;
  -ms-overflow-style: none;  /* IE and Edge */
  scrollbar-width: none;  /* Firefox */
}
.collection-tabs::-webkit-scrollbar {
  display: none;
}
.tab-btn {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  padding: 10px 24px;
  border-radius: 30px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}
.tab-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}
.tab-btn.active {
  background: var(--accent-gradient);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

/* Search Box */
.search-container {
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 4px 16px;
  transition: all var(--transition-fast);
}
.search-container:focus-within {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
}
.search-icon {
  font-size: 18px;
  color: var(--text-secondary);
  margin-right: 12px;
}
.search-container input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 16px;
  padding: 12px 0;
  outline: none;
  font-family: inherit;
}
.search-container input::placeholder {
  color: var(--text-muted);
}
.clear-search {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 24px;
  cursor: pointer;
  padding: 0 8px;
  transition: color var(--transition-fast);
}
.clear-search:hover {
  color: var(--text-primary);
}

/* Public List Table */
.public-list-table th, .public-list-table td {
  padding: 16px;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  text-align: left;
}
.public-list-table th {
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: 0.5px;
}
.public-list-table tr:hover {
  background: rgba(255,255,255,0.02);
}
.public-list-table .paid-time {
  color: var(--text-muted);
  font-size: 13px;
}