:root {
  --bg-primary: #0a0d10;
  --bg-secondary: #1a1d23;
  --bg-tertiary: #252a32;
  --bg-card: rgba(30, 33, 39, 0.95);
  --bg-card-hover: rgba(42, 46, 54, 0.9);
  --text-primary: #e8eaed;
  --text-secondary: #bdc1c6;
  --text-tertiary: #9aa0a6;
  --accent-primary: #4285f4;
  --accent-secondary: #5a9df8;
  --success: #34a853;
  --warning: #fbbc04;
  --danger: #ea4335;
  --border: rgba(66, 133, 244, 0.2);
  --shadow: rgba(0, 0, 0, 0.3);
  --gradient-primary: #4285f4;
  --brand-start: #29C5F6;
  --brand-end: #3F63F0;
}

[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #f1f3f4;
  --bg-card: rgba(255, 255, 255, 0.98);
  --bg-card-hover: rgba(248, 249, 250, 0.95);
  --text-primary: #202124;
  --text-secondary: #5f6368;
  --text-tertiary: #80868b;
  --accent-primary: #1a73e8;
  --accent-secondary: #4285f4;
  --success: #137333;
  --warning: #f29900;
  --danger: #d93025;
  --border: rgba(26, 115, 232, 0.2);
  --shadow: rgba(0, 0, 0, 0.08);
}

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

body {
  font-family: 'Google Sans', 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg-primary);
  min-height: 100vh;
  padding: 20px;
  color: var(--text-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
  font-size: 14px;
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  background: var(--bg-card);
  border-radius: 16px;
  padding: 32px;
  box-shadow: 0 8px 28px var(--shadow);
  border: 1px solid var(--border);
  backdrop-filter: blur(10px);
}

h1 {
  color: var(--text-primary);
  font-size: 32px;
  margin-bottom: 32px;
  font-weight: 600;
  text-align: center;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

h2 {
  color: var(--text-secondary);
  font-size: 22px;
  margin: 32px 0 20px 0;
  font-weight: 500;
  border-bottom: 2px solid var(--accent-primary);
  padding-bottom: 12px;
}

h3 {
  color: var(--text-secondary);
  font-size: 18px;
  margin: 20px 0 12px 0;
  font-weight: 500;
}

.card {
  background: var(--bg-card-hover);
  border-radius: 12px;
  padding: 28px;
  margin: 24px 0;
  box-shadow: 0 4px 16px var(--shadow);
  border: 1px solid var(--border);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

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

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.card:hover::before {
  transform: scaleX(1);
}

.status-card {
  text-align: center;
  padding: 8px 12px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.status-active {
  background: linear-gradient(135deg, var(--success), #137333);
  color: #fff;
}

.status-warning {
  background: linear-gradient(135deg, var(--warning), #f29900);
  color: #fff;
}

.status-expired {
  background: linear-gradient(135deg, var(--danger), #d93025);
  color: #fff;
}

label {
  display: block;
  color: var(--text-secondary);
  font-weight: 500;
  margin-top: 16px;
  margin-bottom: 8px;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

input,
select,
textarea {
  width: 100%;
  padding: 14px 18px;
  margin-bottom: 16px;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  transition: all 0.3s ease;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--accent-primary);
  outline: none;
  box-shadow: 0 0 0 4px rgba(66, 133, 244, 0.1);
}

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

button,
input[type=submit] {
  background: var(--gradient-primary);
  color: white;
  padding: 14px 24px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 500;
  font-size: 14px;
  margin-top: 10px;
  margin-right: 8px;
  transition: all 0.3s ease;
}

button:hover,
input[type=submit]:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(66, 133, 244, 0.3);
}

.btn-success {
  background: linear-gradient(135deg, var(--success), #137333);
}

.btn-danger {
  background: linear-gradient(135deg, var(--danger), #d93025);
}

.btn-warning {
  background: linear-gradient(135deg, var(--warning), #f29900);
}

.flash {
  padding: 16px 20px;
  margin: 20px 0;
  border-radius: 8px;
  font-weight: 500;
  border-left: 4px solid;
}

.flash.success {
  background: rgba(52, 168, 83, 0.1);
  color: var(--success);
  border-color: var(--success);
}

.flash.error {
  background: rgba(234, 67, 53, 0.1);
  color: var(--danger);
  border-color: var(--danger);
}

.flash.warning {
  background: rgba(251, 188, 4, 0.1);
  color: var(--warning);
  border-color: var(--warning);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  background: var(--bg-card);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 16px var(--shadow);
}

th {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  padding: 14px 18px;
  text-align: left;
  font-weight: 600;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
  font-size: 14px;
}

tr:hover td {
  background-color: rgba(66, 133, 244, 0.05);
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin: 24px 0;
}

.info-item {
  background: var(--bg-card-hover);
  padding: 20px;
  border-radius: 12px;
  border: 1px solid var(--border);
  text-align: center;
  transition: all 0.3s ease;
}

.info-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px var(--shadow);
}

.info-item strong {
  display: block;
  color: var(--text-tertiary);
  margin-bottom: 8px;
  font-size: 12px;
  text-transform: uppercase;
}

.info-item span {
  font-size: 22px;
  font-weight: 600;
  color: var(--text-primary);
}

.nav-links {
  text-align: center;
  margin: 32px 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

.nav-links a {
  display: inline-block;
  padding: 12px 20px;
  background: var(--bg-tertiary);
  border-radius: 8px;
  border: 1px solid var(--border);
  color: var(--accent-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s ease;
}

.nav-links a:hover {
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  border-color: var(--accent-primary);
  box-shadow: 0 4px 16px var(--shadow);
}

.pending-payments {
  background: rgba(251, 188, 4, 0.08);
  border-left: 4px solid var(--warning);
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(251, 188, 4, 0.4);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(251, 188, 4, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(251, 188, 4, 0);
  }
}

.pending-payments:hover {
  animation: pulse 2s infinite;
}

.discount-info {
  background: rgba(52, 168, 83, 0.1);
  border: 1px solid rgba(52, 168, 83, 0.3);
  padding: 16px;
  border-radius: 8px;
  margin: 20px 0;
}

@media (max-width: 768px) {
  body { padding: 16px; }
  .container { padding: 24px; border-radius: 12px; }
  .info-grid { grid-template-columns: 1fr; gap: 16px; }
  h1 { font-size: 26px; }
  h2 { font-size: 20px; }
  table { font-size: 12px; }
  th, td { padding: 12px 14px; }
}

::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}
::-webkit-scrollbar-thumb {
  background: var(--accent-primary);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-secondary);
}

/* Account Management Additions */
.account-item {
    background: var(--bg-tertiary);
    border: 2px solid var(--border);
    transition: border-color 0.3s ease, transform 0.3s ease;
}

.account-item:hover {
    border-color: var(--accent-primary);
    transform: translateX(4px);
}

.total-price-display {
    background: linear-gradient(135deg, var(--success), #137333);
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}